01 03 traffic statistic items

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01 03 traffic statistic items

  1. 1. M900/M1800 Base Station Controller Traffic Statistic Manual - Volume I Contents Issue 02 (2008-10-07) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd i Contents 3 Traffic Statistic Items ................................................................................................................3-1 3.1 BSC Measurement Function .........................................................................................................................3-3 3.1.1 General.................................................................................................................................................3-3 3.1.2 Access Measurement Function(1)........................................................................................................3-4 3.1.3 Access Measurement Function(2)......................................................................................................3-39 3.1.4 Handover Measurement Function(1) .................................................................................................3-41 3.1.5 Handover Measurement Function(2) .................................................................................................3-75 3.2 SCCP Measurement Function .....................................................................................................................3-94 3.2.1 General...............................................................................................................................................3-94 3.2.2 Statistic Items.....................................................................................................................................3-95 3.3 A-Interface Operation and Management Statistic......................................................................................3-101 3.3.1 General.............................................................................................................................................3-101 3.3.2 Statistic Items...................................................................................................................................3-102 3.4 A-interface Equipment Maintenance Statistic ...........................................................................................3-105 3.4.1 General.............................................................................................................................................3-105 3.4.2 Statistic Items...................................................................................................................................3-105 3.5 A-interface Trunk Board Message Statistic...............................................................................................3-107 3.5.1 General.............................................................................................................................................3-107 3.5.2 Statistic Items...................................................................................................................................3-108 3.6 CPU Measurement Function .....................................................................................................................3-109 3.6.1 General.............................................................................................................................................3-109 3.6.2 Statistic Items...................................................................................................................................3-110 3.7 BSC Cell Broadcast Measurement............................................................................................................3-111 3.7.1 General.............................................................................................................................................3-111 3.7.2 BSC Cell Broadcast Measurement Function (Total)........................................................................3-111 3.7.3 BSC Cell Broadcast Measurement Function (Period)......................................................................3-124 3.7.4 BSC Cell Broadcast Measurement Function (Others) .....................................................................3-125 3.8 MTP Measurement Function.....................................................................................................................3-126 3.8.1 General.............................................................................................................................................3-126 3.8.2 Statistic Items...................................................................................................................................3-127
  2. 2. M900/M1800 Base Station Controller Traffic Statistic Manual - Volume I Figures Issue 02 (2008-10-07) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd iii Figures Figure 3-1 CM SERVICE REQUEST rejection process....................................................................................3-7 Figure 3-2 Circuit paging process ......................................................................................................................3-9 Figure 3-3 CCCH overload process..................................................................................................................3-11 Figure 3-4 Packet paging process.....................................................................................................................3-12 Figure 3-5 immediate assignment transmission process...................................................................................3-12 Figure 3-6 Packet immediate channel assignment procedure...........................................................................3-13 Figure 3-7 CC connection establishment process.............................................................................................3-14 Figure 3-8 Immediate assignment procedure-channel seizure procedure.........................................................3-17 Figure 3-9 Assignment procedure-channel seizure procedure..........................................................................3-17 Figure 3-10 Intra-BSC handover channel seizure procedure............................................................................3-18 Figure 3-11 Incoming BSC handover channel seizure procedure ....................................................................3-18 Figure 3-12 TCH drop for assignment .............................................................................................................3-21 Figure 3-13 Drop for Intra BSC handover........................................................................................................3-21 Figure 3-14 Incoming BSC TCH handover procedure.....................................................................................3-22 Figure 3-15 Successful TCH seizures for very early assignment procedure ....................................................3-22 Figure 3-16 TCH drop for very early assignment.............................................................................................3-24 Figure 3-17 Immediate assignment procedure-channel seizure procedure.......................................................3-25 Figure 3-18 Intra-BSC handover channel seizure procedure............................................................................3-25 Figure 3-19 Intra-BSC handover channel seizure procedure............................................................................3-26 Figure 3-20 Assignment implementation process.............................................................................................3-28 Figure 3-21 Signaling channel request procedure ............................................................................................3-34 Figure 3-22 Intracell TCHF-TCHH handover success times ...........................................................................3-44 Figure 3-23 internal intercell handover ............................................................................................................3-45 Figure 3-24 Successful internal intercell handover (DIRECTED RETRY) .....................................................3-47 Figure 3-25 Successful Internal intercell handover (not DIRECTED RETRY)...............................................3-48 Figure 3-26 Intra BSC handover ......................................................................................................................3-50
  3. 3. Figures M900/M1800 Base Station Controller Traffic Statistic Manual - Volume I iv Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd Issue 02 (2008-10-07) Figure 3-27 Successful incoming BSC handover.............................................................................................3-51 Figure 3-28 Unsuccessful incoming BSC handover.........................................................................................3-57 Figure 3-29 Incoming BSC handover...............................................................................................................3-61 Figure 3-30 Attempted outgoing BSC handover ..............................................................................................3-62 Figure 3-31 Successful outgoing BSC handover..............................................................................................3-65 Figure 3-32 Unsuccessful outgoing BSC handovers........................................................................................3-68 Figure 3-33 Intracell TCHF-TCHH handover success times ...........................................................................3-70 Figure 3-34 Unsuccessful BSC internal handovers..........................................................................................3-70 Figure 3-35 Intracell TCHF-TCHH handover success times ...........................................................................3-71 Figure 3-36 Outgoing system HO attempts......................................................................................................3-92 Figure 3-37 Unsuccessful outgoing system HOs..............................................................................................3-93 Figure 3-38 Establishment of SCCP signaling connection (successful)...........................................................3-97 Figure 3-39 Establishment of SCCP signaling connection (failure).................................................................3-98 Figure 3-40 Establishment of SCCP signaling connection and data transmission ...........................................3-99 Figure 3-41 Transmission of SCCP signaling.................................................................................................3-100 Figure 3-42 Send broadcast short message.....................................................................................................3-113 Figure 3-43 Delete short message ..................................................................................................................3-113 Figure 3-44 Query broadcast channel.............................................................................................................3-114 Figure 3-45 Query the transmission of broadcast short message ...................................................................3-115 Figure 3-46 Set DRX mode............................................................................................................................3-115 Figure 3-47 Reset cells...................................................................................................................................3-116 Figure 3-48 BTS reports CBCH overflow......................................................................................................3-120 Figure 3-49 Received "write" messages.........................................................................................................3-120
  4. 4. M900/M1800 Base Station Controller Traffic Statistic Manual - Volume I Tables Issue 02 (2008-10-07) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd v Tables Table 3-1 Statistic items in Access measurement function items (1)..................................................................3-4 Table 3-2 Statistic items in Access measurement function items(2).................................................................3-39 Table 3-3 Statistic items in Handover measurement function(1) items ............................................................3-41 Table 3-4 Statistic items in Handover measurement function(2) items ............................................................3-76 Table 3-5 Statistic items in SCCP Measurement Function ...............................................................................3-94 Table 3-6 Statistic items in A-interface Operation and Management Statistic................................................3-101 Table 3-7 Statistic items in A-interface Equipment Maintenance Statistic.....................................................3-105 Table 3-8 Statistic items in A-interface Operation and Management Statistic................................................3-107 Table 3-9 Statistic items in CPU Measurement Function ...............................................................................3-110 Table 3-10 Statistic items in BSC Cell Broadcast Measurement Function (Total) .........................................3-111 Table 3-11 Statistic items in BSC Cell Broadcast Measurement Function(Period)........................................3-124 Table 3-12 Statistic items in BSC Cell Broadcast Measurement Function (Others).......................................3-125 Table 3-13 Statistic items in MTP Measurement Function.............................................................................3-126
  5. 5. M900/M1800 Base Station Controller Traffic Statistic Manual - Volume I 3 Traffic Statistic Items Issue 02 (2008-10-07) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd 3-1 3 Traffic Statistic Items About This Chapter The following table lists the contents of this chapter. Section Describes 3.1 BSC Measurement Function Describes the statistic items of BSC Measurement Function. 3.2 SCCP Measurement Function Describes the statistic items of SCCP Measurement Function. 3.3 A-Interface Operation and Management Statistic Describes the statistic items of A-Interface Operation and Management Statistic. 3.4 A-interface Equipment Maintenance Statistic Describes the statistic items of A-Interface Equipment Maintenance Statistic. 3.5 A-interface Trunk Board Message Statistic Describes the statistic items of A-Interface Trunk Board Message Statistic. 3.6 CPU Measurement Function Describes the statistic items of CPU Measurement Function. 3.7 BSC Cell Broadcast Measurement Describes the statistic items of BSC Cell Broadcast Measurement Function. 3.8 MTP Measurement Function Describes the statistic items of MTP Measurement Function. 3.9 Cell Measurement Function Describes the statistic items of Cell Measurement Function 3.10 Power Control Measurement Describes the statistic items of Power Control Measurement Function. 3.11 Call Drop Measurement Describes the statistic items of Call Drop Measurement Function.
  6. 6. 3 Traffic Statistic Items M900/M1800 Base Station Controller Traffic Statistic Manual - Volume I 3-2 Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd Issue 02 (2008-10-07) Section Describes 3.12 SITE Initial Measurement Function Describes the statistic items of Site Initial Measurement Function. 3.13 BTS Initial Measurement Function Describes the statistic items of Cell Initial Measurement Function. 3.14 Cell Broadcast Statistic Describes the statistic items of Cell Broadcast Statistic. 3.15 Outgoing Inter Cell Handover Measurement Function Describes the statistic items of Outgoing Inter Cell Handover Measurement Function. 3.16 Incoming Inter Cell Handover Measurement Function Describes the statistic items of Incoming Inter Cell Handover Measurement Function. 3.17 Undefined Adjacent Cell Measurement Function Describes the statistic items of Undefined Adjacent Cell Measurement Function. 3.18 Defined Adjacent Cell Measurement Function Describes the statistic items of Defined Adjacent Cell Measurement Function. 3.19 Receiving Quality Measurement Describes the statistic items of Receiving Quality Measurement Function. 3.20 Receiving Level Measurement Function Describes the statistic items of Receiving Level Measurement Function.
  7. 7. M900/M1800 Base Station Controller Traffic Statistic Manual - Volume I 3 Traffic Statistic Items Issue 02 (2008-10-07) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd 3-3 3.1 BSC Measurement Function 3.1.1 General The statistic items in BSC Measurement Function are used to measure the traffic volume of all the cells in the BSC. The BSC Measurement Function includes: Access measurement function, Handover measurement function(1), and Handover measurement function(2). The statistic items in BSC Measurement Function can be divided into following classifications: Statistics of times that MSC rejects MS’s service request, including the statistics according to different rejection causes. The status of circuit service and packet service paging being transmitted and implemented, including the measurement at A (Pb) interface and Abis interface. Measurement of circuit service and packet service CCCH overload. The status of circuit service and packet service immediate assignment request and the implementation. Number of TCH seizure requests, the successful TCH seizures, TCH call drops, TCH seizure requests for very early assignment, successful TCH seizures for very early assignment, TCH call drops for very early assignment, SDCCH seizure requests, successful SDCCH seizures, and SDCCH call drops. Dedicated measurement for assignment procedure, including the number of unsuccessful assignments due to various causes. Measurement of TCH MR (measurement report), and independent measurement of very early TCH assignment MR. Intra-BSC handover request and the implementation of the request, the measurement of incoming BSC handover request and the implementation (including the measurement of the unsuccessful Incoming BSC Handovers due to various causes), outgoing BSC handover request and the implementation, and the measurement of the handover due to various causes. State statistics of A-interface trunk circuits, including the number of circuits in Not Installed or Faulty state, Idle state, and Busy state, and the percentage of the number to the total number configured. The measurement of analytical items such as BSC handover success rate, call drop rate, and traffic volume. Many statistic items in BSC Measurement Function have the corresponding items of cell level in Cell Measurement Function. For the traffic status of the specified cell, you can register the related items in Cell Measurement Function. It is recommended that all statistic items in BSC Measurement Function should be registered through 3 tasks after the BSC kickoff because these items are important items for measuring network performance. It is recommended that the templates should be used to register and the traffic statistic cycle should be 60 minutes. 900/850 cell refers to the cell whose main BCCH frequency is 900MHz or 850MHz. 1800/1900 cell refers to the cell whose main BCCH frequency is 1800MHz or 1900MHz.
  8. 8. 3 Traffic Statistic Items M900/M1800 Base Station Controller Traffic Statistic Manual - Volume I 3-4 Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd Issue 02 (2008-10-07) The statistic object of BSC Measurement Function is the whole BSC. So there is no object option on the object definition interface in OMC traffic statistics console. 3.1.2 Access Measurement Function(1) All the statistic items of Access Measurement Function(1) are listed in.Table 3-1 Table 3-1 Statistic items in Access measurement function items (1) No. Item name 1 Sum of CM Service Rejections 2 CM Service Rejections due to Congestion 3 CM Service Rejections due to Network Failure 4 CM Service Rejections due to Illegal MS 5 CM service rejections due to error messages 6 CM Service Rejections due to Other Causes 7 Average Interval of Random Accesses 8 Average Interval of Random Accesses for Packet Call 9 Number of PAGING REQUESTs for CS Service on the A Interface 10 Number of PAGING REQUESTs for CS Service on the Pb Interface 11 Number of PAGING REQUESTs for PS Service on the Pb Interface 12 Packet Paging Commands to BTS 13 Successful Circuit Pagings of Abis Interface 14 Circuit Paging PCH Overloads of Abis Interface 15 Circuit Paging RACH Overloads of Abis Interface 16 Packet Paging Commands to BTS 17 Immediate Assignment Requests 18 Radom Access Requests 19 Packet Immediate Assignment Request 20 Immediate Assignment Transmissions 21 Successful Packet Immediate Assignment 22 Successful Connections 23 Attempted TCH Seizures (All) 24 Attempted TCH Seizures (All) 25 Successful TCH Seizures 26 TCH Call Drop
  9. 9. M900/M1800 Base Station Controller Traffic Statistic Manual - Volume I 3 Traffic Statistic Items Issue 02 (2008-10-07) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd 3-5 No. Item name 27 Successful TCH Seizures for Early Assignment 28 TCH Drop for Very Early Assignment 29 Attempted SDCCH Seizures (all) 30 Successful SDCCH Seizures 31 Attempted SDCCH Seizures Meeting SDCCH Overflow 32 SDCCH Call Drop 33 Assignment Requests 34 Unsuccessful Assignments 35 Unsuccessful Assignments (Equipment Failure) 36 Unsuccessful Assignments (Requested Terrestrial Resource Unavailable) 37 Unsuccessful Assignments (Terrestrial Circuit Already Allocated) 38 Unsuccessful Assignments (Invalid Message Contents) 39 Unsuccessful Assignments (Radio Interface Failure, Reversion To Previous Channel) 40 Unsuccessful Assignments (No Radio Resource Available) 41 Unsuccessful Assignments (Other Causes) 42 Unsuccessful Channel Activation During Assignment (NACK) 43 Channel Activation Timeout During Assignment 44 Sum of TCH Measurements (Excluding Very Early Assignment) 45 Sum of 1800/1900 Cell TCH Measurements(Excluding Very Early Assignment) 46 Sum of Full Rate TCH Measurements (Excluding Very Early Assignment) 47 Sum of Half Rate TCH Measurements (Excluding Very Early Assignment) 48 Sum of 1800/1900 Cell Full Rate TCH Measurements (Excluding Very Early Assignment) 49 Sum of 1800/1900 Cell Half Rate TCH Measurements (Excluding Very Early Assignment) 50 Sum of Configured TRX in the BSC 51 Sum of Available TRX in the BSC 52 Assignment Requests With Signaling Channel 53 Successful Assignments With Signaling Channel 54 Average number of A-interface circuits(uninstall) 55 Average number of A-interface circuits(Fault)
  10. 10. 3 Traffic Statistic Items M900/M1800 Base Station Controller Traffic Statistic Manual - Volume I 3-6 Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd Issue 02 (2008-10-07) No. Item name 56 Average number of A-interface circuits(Maintenance) 57 Average number of A-interface circuits(Blocked) 58 Average number of A-interface circuits(Idle) 59 Average number of A-interface circuits(Busy) 60 Average number of A-interface circuits(Opposite Uninstall) 61 Number of Configured A-Interface Circuits 62 Percent of A-Interface Circuit (Uninstall) (%) 63 Percent of A-Interface Circuit (Fault) (%) 64 Percent of A-Interface Circuits (Maintenance) (%) 65 Percent of A-Interface Circuits (Blocked) (%) 66 Percent of A-Interface Circuits (Idle) (%) 67 Percent of A-Interface Circuits (Busy) (%) 68 Percent of A-Interface Circuits (Opposite Uninstall) (%) 69 TCH Channel Allocation Failure (No Available License) 70 Circuit Paging Success Rate 71 Ratio of Paging Channel Overloads (%) 72 Rate of Sending Immediate Assignment Command 73 TCH Call Drop Rate (%) 74 Traffic Volume (Excluding Very Early Assignment) (Erl) 75 Traffic Volume Of 1800/1900 Cell (Excluding Very Early Assignment) (Erl) 76 Percentage of TRX In Good Condition (%) 77 SDCCH Call Drop Rate (%) 78 SDCCH Congestion Rate (SDCCH Overflow) (%) 79 Full Rate Traffic Volume (Excluding Very Early Assignment) (ERL) 80 Half Rate Traffic Volume (Excluding Very Early Assignment) (ERL) 81 Full rate Traffic Volume Of 1800/1900 Cell (Excluding Very Early Assignment) (ERL) 82 Half Rate Traffic Volume Of 1800/1900 Cell (Excluding Very Early Assignment) (ERL)
  11. 11. M900/M1800 Base Station Controller Traffic Statistic Manual - Volume I 3 Traffic Statistic Items Issue 02 (2008-10-07) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd 3-7 Sum of CM Service Rejections Description: in the MS originating immediate assignment procedure, first MS and BSS establish RR connection. Then MS sends the detailed MM service request on MM layer through CM SERVICE REQUEST to network side. This message can carry the following MM service types: Mobile originating call establishment, packet mode connection establishment, emergency call establishment, short message service and supplementary service activation. BSS transparently transmits this message to NSS. If NSS does not support nor does not respond to this service request for some reason, MSC sends CM SERVICE REJECT message to the MS. BSC transparently transmits this message. See GSM 0408 protocol. Measurement point: as shown in Figure 3-1 A1, when BSC receives the DTAP message of CM SERVICE REJECT from MSC, this item is measured regardless the rejection cause carried in the message. Formula: none Figure 3-1 CM SERVICE REQUEST rejection process A1: Sum of CM service rejections B1: Sum of CM service rejections (congestion) C1: Sum of CM service rejections (network failure) D1: Sum of CM service rejections (illegal MS) E1: Sum of CM service rejections (other reasons) F1: Sum of CM service rejections (error messages) CM Service Rejections due to Congestion Description: if NSS cannot normally respond to a CM SERVICE REQUEST message due to the congestion after receiving this message from MS MM layer, NSS responds MS a CM SERVICE REJECT message in which the rejection cause is congestion. See GSM 0408 protocol. Measurement point: as shown in the B1 in Figure 3-1, this item is measured when BSC receives the DTAP message of CM SERVICE REJECT from MSC and the rejection cause carried in this message is congestion. Formula: none
  12. 12. 3 Traffic Statistic Items M900/M1800 Base Station Controller Traffic Statistic Manual - Volume I 3-8 Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd Issue 02 (2008-10-07) CM Service Rejections due to Network Failure Description: if NSS cannot normally respond to a CM SERVICE REQUEST due to network failure after receiving this message from MS MM layer, NSS responds MS a CM SERVICE REJECT message in which the rejection cause is network failure. See GSM 0408 protocol. Measurement point: as shown in the C1 in Figure 3-1, BSC measures this item when BSC receives the DTAP message of CM SERVICE REJECT from MSC, the rejection cause carried in this message is network failure. Formula: none CM Service Rejections due to Illegal MS Description: if NSS cannot normally respond to a CM SERVICE REQUEST due to being unable to identify the MS after receiving this message from the MS MM layer, the NSS responds MS a CM SERVICE REJECT message in which the rejection cause is illegal MS. See GSM 0408 protocol. Measurement point: as shown in the D1 in Figure 3-1, this item is measured when the BSC receives the DTAP message of CM SERVICE REJECT from MSC with the rejection cause carried in this message being illegal MS. Formula: none CM service rejections due to error messages Description: if NSS cannot normally respond to a CM SERVICE REQUEST due to error messages after receiving this message from the MS MM layer, the NSS responds MS a CM SERVICE REJECT message in which the rejection cause is error message. See GSM 0408 protocol. Measurement point: as shown in the F1 in the Figure 3-1, this item is measured when the BSC receives the DTAP message of CM SERVICE REJECT from MSC with the rejection cause carried in this message being error messages. Formula: none CM Service Rejections due to Other Causes Description: if NSS cannot normally respond to a CM SERVICE REQUEST due to the reasons other than above mentioned ones after receiving this message from MS MM layer, NSS responds MS a CM SERVICE REJECT message. See GSM 0408 protocol. Measurement point: as shown in the E1 in Figure 3-1, this item is measured when BSC receives the DTAP message of CM SERVICE REJECT from MSC with the rejection cause carried in this message being other than the above mentioned ones. Formula: none Average Interval of Random Accesses Description: This item describes the access frequency of calling MS. The RR entity of the mobile station initiates the immediate assignment procedure by scheduling the sending of CHANNEL REQUEST on the RACH to BTS, then BTS sends CHANNEL REQUIRED to BSC. See GSM 0408. Measurement point: BSC counts 1 to the number of channel accesses every time it receives CHANNEL REQUIRED message from BTS, and average inter arrival time = measurement period (second)/sum of channel access times within the measurement period.
  13. 13. M900/M1800 Base Station Controller Traffic Statistic Manual - Volume I 3 Traffic Statistic Items Issue 02 (2008-10-07) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd 3-9 Formula: Measurement period (second)/sum of channel access times within the measurement period Unit: Second Average Interval of Random Accesses for Packet Call Description: This item describes the frequency of PS access frequency with the access cause being packet call. The RR entity of the mobile station initiates the immediate channel assignment procedure by periodically sending of CHANNEL REQUEST on the RACH to BTS, then BTS sends CHANNEL REQUIRED to BSC. See GSM 0408 protocol. Measurement point: BSC counts 1 to the number of channel accesses every time BSC receives CHANNEL REQUIRED message from BTS containing access cause "packet call", and average inter of packet arrival time = measurement period (second)/sum of channel packet access times in the measurement period. Formula: measurement period (second)/sum of channel packet access times within the measurement period Unit: Second Number of PAGING REQUESTs for CS Service on the A Interface Description: when an MS under the BSC is called for CS service, the MSC sends the circuit service PAGING message to page the called MS from the A interface. This item is used to measure the sum of the received PAGING messages in the statistic cycle. The repeated PAGING message is measured repeatedly. See GSM Rec. 08.08. Measurement point: As shown in Figure 3-2 A1, this item is measured every time BSC receives the circuit PAGING messages from the A interface. Formula: none Figure 3-2 Circuit paging process 3. PAGING REQUEST 2. PAGING COMMAND MS BTS BSC PCU SGSN MSC/VLR 11'. PAGING 12'. PAGING REQUEST 13'. PAGING REQUEST A2 4.CHANNEL REQUEST 5.CHANNEL REQUIRED 6.CHANNEL ACTIVATION 7. CHANNEL ACKTIVATION ACKNOWLEDGE 8.IMMEDIATE ASSIGN CMMAND9. IMMEDIATE ASSIGNMENT 10. PAGING RESPONSE 11. EST IND(PAGING RESPONSE) C1 A1 B1 1. PAGING A1: Number of Paging Requests from the MSC for CS service on the A interface A2: Received circuit paging messages from MSC through GS interface
  14. 14. 3 Traffic Statistic Items M900/M1800 Base Station Controller Traffic Statistic Manual - Volume I 3-10 Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd Issue 02 (2008-10-07) A1: Number of Paging Requests from the MSC for CS service on the A interface B1: Circuit paging commands to BTS C1: Successful circuit paging of Abis interface Number of PAGING REQUESTs for CS Service on the Pb Interface Description: When an MS under the BSC is called for CS service, the MSC sends the circuit service PAGING message to page the called MS from the Gb interface. This item is used to measure the sum of the received PAGING messages in the statistic cycle. The repeated PAGING message is measured repeatedly. See GSM Rec. 08.08. Measurement point: As shown in Figure 3-2 A2, this item is measured every time the BSC receives the circuit PAGING messages from the Pb interface (between Huawei BSC and the PCU). Formula: None Number of PAGING REQUESTs for PS Service on the Pb Interface Description: When an MS under the BSC is called for PS service, the MSC sends a PS PAGING message to page the called MS from the Gb interface. This item is used to measure the sum of the received PAGING messages in a statistic cycle. The repeated PAGING message is measured repeatedly. See GSM Rec. 08.08. Measurement point: This item is measured every time the BSC receives a PS PAGING message from the Pb interface (between Huawei BSC and the PCU). Formula: None Circuit Paging Commands to BTS Description: in the case an MS under the BSC is called for CS service, BSC sends PAGING COMMAND to the corresponding cell according to the cell identification discriminator after receiving the circuit PAGING message from the MSC or PCU. This item is used to measure the paging delivery times at Abis. See GSM 08.58 and 04.08. Measurement point: as shown in the Figure 3-2 B1, this item is measured in every cell every time BSC sends PAGING COMMAND message to the corresponding cell. Formula: none Successful Circuit Pagings of Abis Interface Description: after a called MS receives PAGING REQUEST message from network side, the paging response process is implemented. This MS reports ESTABLISH INDICATION, with the cause value PAGING RESPONSE, to MSC if it successfully seizes signaling channel. See GSM 0408 protocol. Measurement point: as shown in Figure 3-2 C1, this item is measured every time BSC receives PAGING RESPONSE message from MS. Formula: none Circuit Paging PCH Overloads of Abis Interface Description: BTS reports CCCH LOAD INDICATION message to BSC when detecting the overload of PCH, then BSC measures this item and sends OVERLOAD message to MSC simultaneously. See GSM 0858 protocol.
  15. 15. M900/M1800 Base Station Controller Traffic Statistic Manual - Volume I 3 Traffic Statistic Items Issue 02 (2008-10-07) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd 3-11 Measurement point: as shown in Figure 3-2 A1, this item is measured when BSC receives CCCH LOAD INDICATION message from BTS with the cause value carried in the message being PCH overload. Formula: none Figure 3-3 CCCH overload process BTS BSC MSC/VLR CCCH LOAD INDICATION A1 OVERLOADB1 A1:Circuit paging PCH overloads of Abis interface B1: Circuit paging RACH overloads of Abis interface Circuit Paging RACH Overloads of Abis Interface Description: When detecting RACH overload, BTS reports CCCH LOAD INDICATION to BSC, then BSC measures this item and implements the internal flow control. Measurement point: as shown in Figure 3-2 B1, this item is measured when BSC receives CCCH LOAD INDICATION message from BTS with the cause value carried in the message being RACH overload. Formula: none Packet Paging Commands to BTS Description: in the case an MS under the BSC is called for packet service, SGSN sends PAGING REQUEST message to PCU to page this MS. PCU processes this message and then sends PACKET PAGING message to BSC. According to the cell identification discriminator carried in the PACKET PAGING message, BSC sends PACKET PAGING REQUEST message to the corresponding cell. See GSM 0408, 0460, 0360 protocols. Measurement point: as shown in Figure 3-2 A1, this item is measured in every cell when BSC sends a PACKET PAGING REQUEST message to the corresponding cell. Formula: none
  16. 16. 3 Traffic Statistic Items M900/M1800 Base Station Controller Traffic Statistic Manual - Volume I 3-12 Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd Issue 02 (2008-10-07) Figure 3-4 Packet paging process PACKETPAGING REQUEST MS BSC+BTS PCU SGSN PAGING REQUEST PACKET PAGING A1 A1: Packet paging commands to BTS Immediate Assignment Requests Description: when an MS wants to obtain network service due to some reason, this MS sends CHANNEL REQUEST message to BTS on RACH to request Dedicated Control Channel, then BTS sends CHANNEL REQUIRED to BSC. This item measures all the access cause value of CHANNEL REQUIRED, not including the discarded numbers of immediate assignment requests in flow control. Measurement point: This item is measured when BSC receives CHANNEL REQUIRED message from BTS, as shown in Figure 3-5A1. The item is measured after flow control. That is to say, the item does not include the discarded numbrs of immediate assignment requests in flow control .Formula: none. Figure 3-5 immediate assignment transmission process MS BTS BSC 1.CHANNEL REQUEST 2.CHANNEL REQUIRED 3.CHANNEL ACTIVATION 4. CHANNEL ACKTIVATION ACKNOWLEDGE 5.IMMEDIATE ASSIGN CMMAND A1 B1 A1: Immediate assignment request/ Radom Access Requests B1: Immediate assignment transmissions Radom Access Requests Description: When an MS wants to obtain network service due to some reason, this MS sends CHANNEL REQUEST message to BTS on RACH, then BTS sends CHANNEL REQUIRED to BSC. Measurement point:, This item is measured when BSC receives CHANNEL REQUIRED message from BTS, as shown in Figure3-5A1.
  17. 17. M900/M1800 Base Station Controller Traffic Statistic Manual - Volume I 3 Traffic Statistic Items Issue 02 (2008-10-07) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd 3-13 Formula: none Packet Immediate Assignment Request Description: to request channel for packet service, MS sends CHANNEL REQUEST message to BTS on RACH and the access cause carried in the message is Packet Call, then BTS sends CHANNEL REQUIRED to BSC. Upon reception of this message, BSC forwards the request to PCU. See GSM 0408 and 0406 protocol. Measurement point: as shown in Figure 3-6 A1, BSC measures this item when BSC receives CHANNEL REQUIRED message from BTS and if the access cause carried in the message is Packet Call. Formula: none Figure 3-6 Packet immediate channel assignment procedure MS BTS BSC CHANNEL REQUEST(PACKET CALL) CHANNEL REQUIRED IMMEDIATE ASSIGN CMMAND A1 HUAWEI PCU Packet Channel Request Packet Immediate Assign Command B1 A1: Packet immediate assignment request B1: Successful packet immediate assignment Immediate Assignment Transmissions Description: in immediate assignment procedure, upon reception of the CHANNEL REQUIRED message reported from BTS, BSC allocates and activates a signaling channel for the MS. If BSC receives the CHANNEL ACTIVATION ACKNOWLEDGE message from BTS indicating that the channel is ready, BSC sends an IMMEDIATE ASSIGNMENT COMMAND message informing the MS to access the dedicated signaling channel, which can be either SDCCH or TCH. This item includes all access cause value of CHANNEL REQUIRED. Measurement point: As shown in Figure 3-6 B1, this item is measured when BSC sends the IMMEDIATE ASSIGN COMMAND message to MS. Formula: none Successful Packet Immediate Assignment Description: if the cause value carried in the CHANNEL REQUEST message sent by MS on RACH is packet call, BSC forwards this message to PCU after receiving the message. PCU initiates PDCH assignment procedure after receiving the forwarded message and sends a Packet Immediate Assign Command message (Huawei Pb interface) to BSC, then BSC converts this message into IMMEDIATE ASSIGN COMMAND of Abis interface to BTS and BTS sends this message to MS. This process is described in Figure 3-6. The measurement point of this item is indicated in B1. See GSM 0408, 0460 protocol. Measurement point: upon reception of the Packet Immediate Assign Command message from PCU, BSC measures this item and sends IMMEDIATE ASSIGN COMMAND to BTS. Formula: none
  18. 18. 3 Traffic Statistic Items M900/M1800 Base Station Controller Traffic Statistic Manual - Volume I 3-14 Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd Issue 02 (2008-10-07) Successful Connections Description: the successful circuit service connection time in immediate assignment procedure, if CC connection is to be established after MM connection establishment of MOC, MOC sends a SETUP message to the network to request the call setting up; then MSC responds a CALL PROCESSING message to MOC and pages MTC simultaneously. After the MM connection establishment between MSC and MTC, MSC sends a SETUP message to MTC to request the establishment of CC connection. If permitting the call establishment, MTC responds a CALL CONFIRM message to MSC and MSC forwards this message to MOC. Having seized the traffic channel, MTC sends an ALERTING message to MSC and MSC forwards this message to MOC. After that, MTC sends a CONNECT message to MOC after its off-hook, MOC responds the CONNECT ACKNOWLEDGE message. The call is set up and the MOC and MTC enter the conversation state. See GSM 0408, 0858, 0808 protocols for detailed full process of call connection establishment between the calling MS and the called MS. This statistic item includes the "directed retry" in the channel assignment procedure. If the directed retry takes place in the channel assignment procedure, this item is measured in the cell that actually allocates channel that is destination cell of directed retry. Measurement point: As shown in Figure 3-6 A’, A’’, this item is measured when BSC receives the DTAP type of CC message CONNECT or CONNECT ACKNOWLEDGE. If MOC and MTC share the same BSC, both MOC and MTC are measured. Formula: none Figure 3-7 CC connection establishment process Ori-MS BSS1 MSC A1" 1.CM SERVICE REQUEST BSS2 Termi-MS 3.CALL CONFIRM ED 2.SETUP 4.ALARTING 4.CONNECT 5.CONNECT ACKNOWLEDGEA1' Note: A1' count in BSS1 A1" count in BSS2 A’, A’’: Successful connections Attempted TCH Seizures (All) Description: in the following procedures, if the requested channel type is TCH, this item shall be measured after BSC receives a relevant request. − In immediate assignment procedure, MS sends CHANNEL REQUEST to BTS to request radio channel.
  19. 19. M900/M1800 Base Station Controller Traffic Statistic Manual - Volume I 3 Traffic Statistic Items Issue 02 (2008-10-07) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd 3-15 − In assignment procedure and incoming BSC handover procedure, MSC requests radio resource by sending ASSIGNMENT REQUEST or HANDOVER REQUEST to BSC. − In intra BSC handover, BSC itself requests a new channel for call.
  20. 20. 3 Traffic Statistic Items M900/M1800 Base Station Controller Traffic Statistic Manual - Volume I 3-16 Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd Issue 02 (2008-10-07) SDCCH handover: Handover happens on SDCCH. Channel reallocation: In the immediate assignment procedure, Huawei BSC supports channel reallocation. BSC initiates radio channel allocation when it receives CHANNEL REQUIRED message from BTS. BSC allocates a TCH if the access cause value of CHANNEL REQUIRED is "emergency call "or "call re-establishment" and BSC supports very early assignment TCH. Otherwise, BSC allocates a SDCCH. BSC reallocates radio channel automatically based on "GSM 0408" if BSC supports very early assignment of TCH and channel allocation fails due to no radio resource available. In other words BSC allocates a TCH automatically if SDCCH allocation fails and the access cause is not "location update", and similarly, BSC allocates a SDCCH automatically if TCH allocation fails. So, to one CHANNEL REQUEST message, BSC measures both SDCCH and TCH seizure times. Very early assignment TCH: If BSC allocates a TCH as a signaling channel in immediate assignment procedure, instead of the traffic channel allocation procedure, the Mode Modify procedure can be implemented in the assignment procedure. Assignment SDCCH: In the assignment procedure, MSC sends ASSIGNMENT REQUEST message to BSC to request for a radio channel. BSC responses ASSIGNMENT COMPLETE message to MSC directly if the channel type in the ASSIGNMENT REQUEST is SDCCH. In this case, BSC implements signaling or short message transmission on the channel already allocated. BSC does not measure either "attempted SDCCH seizures" or "successful SDCCH seizures" for it does not allocate a new channel. Instead, it measures the times of "assignment requests" and "assignment success" after successfully sending ASSIGNMENT COMPLETE message. Discard CHANNLE REQUIRED in internal flow: In the immediate assignment procedure, BSC receives CHANNEL REQUIRED messages from BTS. BSC discards these messages if the system is too busy to respond. In this case, "attempted TCH" or "SDCCH seizures" will be measured but "successful or unsuccessful channel seizures" will not be measured. Measurement point: the measurement point of this item is described inFigure 3-8, Figure 3-9, Figure 3-10 and Figure 3-11TCH-ATT-BSC1--TCH-ATT-BSC4. − In immediate assignment procedure, this item is measured when BSC receives CHANNEL REQUIRED message from BTS and the requested channel type is TCH. − In assignment procedure, this item is measured when BSC receives ASSIGNMENT REQUEST message from MSC and the requested channel type is TCH. − In intra BSC handover, the source cell sends Intercell Handover Request message (Huawei defined message) to the target cell; if the handover is taken place on TCH, this item is measured when the target cell receives this message. The intra BSC handover includes the case that handover is taken place in the same cell with the originating and the target cell being the same one. − This item is measured when Huawei BSC receives the HANDOVER REQUEST message from other BSC and the handover is taken place on TCH. Formula: none
  21. 21. M900/M1800 Base Station Controller Traffic Statistic Manual - Volume I 3 Traffic Statistic Items Issue 02 (2008-10-07) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd 3-17 Figure 3-8 Immediate assignment procedure-channel seizure procedure MS BTS BSC CHANNEL REQUEST CHANNEL REQUIRED CHANNEL ACTIVATION CHANNEL ACKTIVATION ACKNOWLEDGE TCH-ATT-BSC1 TCH -ATT-BSC1: Attempted TCH seizures (all) Figure 3-9 Assignment procedure-channel seizure procedure MS BTS BSC .ASSIGN CMMAND MSC ASSIGNMENT REQUEST SABM UA ESTABLISH INDICATION ASSIGNMENT COMPLETE (directly retry)HANDOVER REQIRED (directly retry)HANDOVER REQUEST ACK CHANNEL ACTICATION CHANNEL ACTIVATION ACK QUEUEING INDICATION TCH-ATT-BSC 2 TCH -ATT-BSC2: Attempted TCH seizures (all)
  22. 22. 3 Traffic Statistic Items M900/M1800 Base Station Controller Traffic Statistic Manual - Volume I 3-18 Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd Issue 02 (2008-10-07) Figure 3-10 Intra-BSC handover channel seizure procedure MS BTS' BSC Ori-Cell HANDOVER ACCESS UA Intercell Handover Request BSC Des-Cell BTS'' MR Handover algorithm HANDOVER COMMAND Intercell Handover Response HANDOVER DETECT CH ACT CH ACT ACK HANDOVER COMPLETE Inter Clear Request (Handover Success) TCH-ATT-BSC3 SABM TCH -ATT-BSC3: Attempted TCH seizures (all) Figure 3-11 Incoming BSC handover channel seizure procedure MS Other BSC HANDOVER ACCESS UA HANDOVER REQUIRED HUAWEI BSC HUAWEI BTS HANDOVER COMMAND HANDOVER REQUEST ACK HANDOVER DETECT CH ACT CH ACT ACK HANDOVER COMPLETE TCH-ATT-BSC4 MSC QUEUEING INDICATION HANDOVER REQUEST SABM TCH -ATT-BSC4: Attempted TCH seizures (all) TCH Call Drop Connected Description: this item measures the number of call drop when MS is normally during the conversation on radio channel. In the assignment procedure and handover procedure, the establishment of a conversation is indicated by: in assignment procedure BSC receives the CONNECT message and the CONNECT ACKNOWLEDGE message from CC layer; in the incoming BSC handover procedure the target cell sends HANOVER COMPLETE message to MSC; successful intra BSC handover: the target cell sends HANDOVER
  23. 23. M900/M1800 Base Station Controller Traffic Statistic Manual - Volume I 3 Traffic Statistic Items Issue 02 (2008-10-07) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd 3-19 PERFORMED message to MSC when it detects the access of the MS. If the call drop occurs after the above stages, it will be regarded as call drop connected. Measurement point: − Upon BSC’s reception of ERROR INDICATION message from BTS due to an abnormal connection in a radio link layer. See GSM 0508 protocol. − During MS conversation, BTS detects a fault in radio link layer or hardware; it sends a CONNECTION FAILURE INDICATION message to BSC informing the BSC this failure. See GSM 0508 protocol. − The timer expires when BSC waiting for the CLEAR COMMAND message from MSC during outgoing BSC handover. − In Intra-BSC handover procedure, the target cell sends Inter Clear Request to the source cell when the timer for the target cell to wait for HANDOVER COMPLETE from MS expires, in this case, this item is measured in the source cell. − In Intra-BSC handover procedure, the source cell, excluding the source cell for directed retry, measures the item when the timer for the source cell to wait for Inter Clear Request with cause value HANDOVER COMPLETE from the target cell expires. − In Intra-BSC handover procedure, when the target cell AM/CM net-drive fails (due to timeout or negative acknowledgement), the target cell sends Inter Clear Request to source cell, in this case, this item is measured in the source cell. − In the case that MS reverses to the original channel after intra BSC handover fails, the source cell first releases the terrestrial connection but the AM/CM re-net-drive fails (due to timeout or negative acknowledgement). In this case this item is measured in the source cell. − The resource of the lower_priority call will be preempted by the higher_priority call if MSC and BSC both support preemption, which will cause call drop. − This item is measured when the RSL link of the TRX that the call is using disconnects, which will cause call drop. AM/CM net-drive: In assignment procedure or handover procedure, BSC establishes the terrestrial connection in A-interface for a MS after it has successfully allocated radio channel. Formula: none Successful TCH Seizures Description: in very early assignment procedure, assignment procedure, and handover procedure, BSC measures this item when MS successfully seizes the allocated TCH. The successful directed retry is also measured as successful TCH seizure: If there is no available channel after ASSIGNMENT REQUEST message from MSC is sent to the cell of the BSC and the system supports directed retry, then BSC initiates outgoing cell handover according to the information about adjacent cell in MS’s MR. Measurement point: this item is measured if TCH is successfully seized by the following processes: − Upon BSC’s reception of CHANNEL ACTIVATION ACKNOWLEDGE message from BTS in very early assignment TCH process. − In the case the target cell of directed retry is located in other BSC and directed retry succeeds, MSC sends CLEAR COMMAND message to the originating BSC to release the original connection. This item is measured when the originating BSC receives this message.
  24. 24. 3 Traffic Statistic Items M900/M1800 Base Station Controller Traffic Statistic Manual - Volume I 3-20 Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd Issue 02 (2008-10-07) − In the case the directed retry target cell is located in the same BSC and the directed retry succeeds, target cell sends Inter Clear Request message to the source cell to request to release the resource and the original connection. This item is measured when the source cell receives this message. − This item is measured when BSC sends ASSIGNMENT COMPLETE message to MSC after the assignment procedure is successfully implemented. − In incoming BSC handover procedure, MS sends HANDOVER ACCESS message to the BSC. This item is measured when BSC receives HANDOVER DETECT message from BTS. − In the process of incoming internal inter cell handover and intracell handover in BSC, MS sends HANDOVER ACCESS message to BSC. BSC measures this item in the target cell when receiving HANDOVER DETECTION message from BTS. Formula: none TCH Call Drop Description: in assignment procedure and traffic channel handover procedure, BSC measures TCH call drop when the process implementation fails due to some reason after MS has accessed the TCH assigned by BSC. Or this item is measured when call drop takes place due to some reason when MS is in normal seizure of TCH. After the above cases occur, BSC sends CLEAR REQUEST message to MSC to request to clear the call. Measurement point: this item is measured if call drop occurs on TCH in the following processes.Figure 3-12, Figure 3-13, Figure 3-14 A1 and A2 indicate the main measurement points. − In the case TCH serves as traffic channel, this item is measured when BSC receives ERROR INDICATION message from BTS due to an abnormal case for a radio link layer connection. See GSM 0858 protocol. − In the case TCH is seized as traffic channel, this item is measured when BSC receives the CONNECT FAILURE INDICATION message from BTS due to an active connection has been broken for some reason such as TCH link failure or hardware failure etc. See GSM 0508 for details. − In the case TCH serves as traffic channel, this item is measured when incoming BSC handover is initiated and the timer for the target cell to wait for HANDOVER COMPLETE message expires. − In the case TCH serves as traffic channel, this item is measured when outgoing BSC handover is initiated and the timer for the source cell to wait for CLEAR COMMAND message from MSC expires (T8 expires). − In Intra-BSC handover procedure, the target cell sends Inter Clear Request to the source cell when the timer for the target cell to wait for HANDOVER COMPLETE from MS expires, in this case, this item is measured in the source cell. − In Intra-BSC handover procedure, the source cell, excluding the source cell for directed retry, measures the item when the timer for the source cell to wait for Inter Clear Request with cause value HANDOVER COMPLETE from the target cell expires. − In Intra-BSC handover procedure, when the target cell AM/CM net-drive fails (due to timeout or negative acknowledgement), the target cell sends Inter Clear Request to source cell, in this case, this item is measured in the source cell. − In the case that MS reverses to the original channel after intra BSC handover fails, the source cell first releases the terrestrial connection but the AM/CM re-net-drive fails (due to timeout or negative acknowledgement). In this case this item is measured in the source cell.
  25. 25. M900/M1800 Base Station Controller Traffic Statistic Manual - Volume I 3 Traffic Statistic Items Issue 02 (2008-10-07) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd 3-21 − The resource of the lower_priority call will be preempted by the higher_priority call if MSC and BSC both support preemption, which will cause call drop. − This item is measured when the RSL link of the TRX that the call is using disconnects, which will cause call drop. Formula: none. Figure 3-12 TCH drop for assignment MS BTS BSC ASSIGN CMMAND MSC ASSIGNMENT REQUEST SABM UA ESTABLISH INDICATION CHANNEL ACTICATION CHANNEL ACTIVATION ACK A1 ERROR INDICATION CONNECTION FAILURE INDICATION A2 A1, A2: TCH call drop (BSC) Figure 3-13 Drop for Intra BSC handover MS BSC' BSC Ori-Cell HANDOVER ACCESS UA Intercell Handover Request BSC Tag-Cell BSC'' HANDOVER COMMAND Intercell Handover Response HANDOVER DETECT CH ACT CH ACT ACK A1 ERROR INDICATION CONNECTION FAILURE INDICATION A2 SABM A1, A2: TCH drop for very early assignment (BSC), TCH call drop (BSC)
  26. 26. 3 Traffic Statistic Items M900/M1800 Base Station Controller Traffic Statistic Manual - Volume I 3-22 Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd Issue 02 (2008-10-07) Figure 3-14 Incoming BSC TCH handover procedure MS Other BSC HANDOVER ACCESS UA HANDOVER REQUIRED HUAWEI BSC HUAWEI BTS HANDOVER COMMAND HANDOVER REQUEST ACK HANDOVER DETECT CH ACT CH ACT ACK MSC A1 ERROR INDICATION CONNECTION FAILURE INDICATION A2 SABM HANDOVER REQUEST A1, A2: TCH drop for very early assignment (BSC), TCH call drop (BSC) Successful TCH Seizures for Early Assignment Description: BSC measures this item when MS successfully seizes the TCH assigned by the network in early assignment procedure (including the MS access for various reasons). Measurement point: the measurement points of this item are indicated in Figure 3-15 A1. This item is measured when BSC receives CHANNEL ACTIVATION ACKNOWLEDGE message from BTS in early assignment TCH process. Formula: none Figure 3-15 Successful TCH seizures for very early assignment procedure MS BTS BSC 1.CHANNEL REQUEST 2.CHANNEL REQUIRED 3.CHANNEL ACTIVATION 4. CHANNEL ACKTIVATION ACKNOWLEDGE 5.IMMEDIATE ASSIGN CMMAND A1 ESTABLISH INDICATION(SAPI=0) A1:Successful TCH seizures for very early assignment
  27. 27. M900/M1800 Base Station Controller Traffic Statistic Manual - Volume I 3 Traffic Statistic Items Issue 02 (2008-10-07) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd 3-23 TCH Drop for Very Early Assignment Description: In intraBSC or inter BSC handover procedure, if a handover occurs on TCH and the speech data indication is signaling, this handover is regarded as a signaling channel handover. BSC measures this item if MS has accessed the TCH assigned by BSC but the implementation of the signaling channel handover fails due to some reason. BSC also measures this item when call drop occurs due to some reason after MS has established the normal connection on TCH and the speech data indication is signaling. When the above cases occur, BSC sends a CLEAR REQUEST message to MSC to clear the current connection. Measurement point: this item is measured if the channel type in the following cases is TCH. The A1 and A2 in Figure 3-13 ,Figure 3-14 and Figure 3-16 indicate the main measurement points of this item. − In the case TCH is seized as signaling channel, this item is measured when BSC receives ERROR INDICATION message from BTS due to an abnormal case for a radio link layer connection. See GSM 0858 protocol. − In the case TCH is seized as signaling channel, this item is measured when BSC receives CONNECTION FAILURE INDICATION message from BTS due to an active connection has been broken for some reason such as TCH link failure or hardware failure etc. See GSM 0858 protocol for details. − In the case TCH is seized as signaling channel, in incoming BSC handover procedure, this item is measured in the target cell in the case of the failure of decoding HANDOVER DETECTION and HANDOVER COMPLETE message. − In the case TCH serves as signaling channel, this item is measured when incoming BSC handover is initiated and the timer for the target cell to wait for HANDOVER COMPLETE message expires. − In the case TCH serves as signaling channel, this item is measured when outgoing BSC handover is initiated and the timer for the source cell to wait for CLEAR COMMAND message from MSC expires (T8 expires). − In the case TCH is seized as signaling channel, in Intra-BSC handover procedure, this item is measured in the source cell when the timer for the target cell or the source cell to wait for HANDOVER COMPLETE expires. − In the case TCH is seized as signaling channel, The resource of the lower_priority call will be preempted by the higher_priority call if MSC and BSC both supports preemption, which will cause call drop. − In the case TCH is seized as signaling channel, this item is measured when the RSL link of the TRX that the call is using disconnects, which will cause call drop. Formula: none
  28. 28. 3 Traffic Statistic Items M900/M1800 Base Station Controller Traffic Statistic Manual - Volume I 3-24 Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd Issue 02 (2008-10-07) Figure 3-16 TCH drop for very early assignment MS BTS BSC CHANNEL REQUEST CHANNEL REQUIRED CHANNEL ACTIVATION CHANNEL ACKTIVATION ACKNOWLEDGE IMMEDIATE ASSIGN CMMAND EST_IND A1 SABM UA ERROR INDICATION CONNECTION FAILURE INDICATION A2 A1, A2: TCH drop for very early assignment (BSC) Attempted SDCCH Seizures (all) Description: in immediate assignment procedure, MS sends CHANNEL REQUEST to BTS to request radio channel. In incoming BSC handover procedure, MSC requests radio resource by sending HANDOVER REQUEST to BSC. In intra BSC handover, BSC itself requests a new channel for call. In those cases, this item is measured when BSC receives SDCCH allocation request. Measurement point: the measurement point of this item is described in Figure 3-17, Figure 3-18 and Figure 3-19 SD-ATT-BSC1--SD-ATT- BSC3. − In immediate assignment procedure, BSC measure this item when it receives CHANNEL REQUIRED message from MS and if the requested channel type is SDCCH. − For intra BSC handover on SDCCH, this item is measured when the target cell receives Intercell Handover Request message (Huawei defined message) from the source cell. − This item is measured if when Huawei BSC receives HANDOVER REQUEST message from other BSC and the handover is taken place on SDCCH. Formula: none
  29. 29. M900/M1800 Base Station Controller Traffic Statistic Manual - Volume I 3 Traffic Statistic Items Issue 02 (2008-10-07) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd 3-25 Figure 3-17 Immediate assignment procedure-channel seizure procedure MS BTS BSC CHANNEL REQUEST CHANNEL REQUIRED CHANNEL ACTIVATION CHANNEL ACKTIVATION ACKNOWLEDGE IMMEDIATE ASSIGN CMMAND SD-ATT-BSC1 EST_IND SD -ATT-BSC1: Attempted SDCCH seizures (all) Figure 3-18 Intra-BSC handover channel seizure procedure MS BTS' BSC Ori-Cell HANDOVER ACCESS UA Intercell Handover Request BSC Des-Cell BTS'' MR Handover algorithm HANDOVER COMMAND Intercell Handover Response HANDOVER DETECT CH ACT CH ACT ACK HANDOVER COMPLETE Inter Clear Request (Handover Success) SD-ATT-BSC2 SABM SD-ATT-BSC2: Attempted SDCCH seizures (all)
  30. 30. 3 Traffic Statistic Items M900/M1800 Base Station Controller Traffic Statistic Manual - Volume I 3-26 Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd Issue 02 (2008-10-07) Figure 3-19 Intra-BSC handover channel seizure procedure MS Other BSC HANDOVER ACCESS UA HANDOVER REQUIRED HUAWEI BSC HUAWEI BTS HANDOVER COMMAND HANDOVER REQUEST ACK HANDOVER DETECT CH ACT CH ACT ACK HANDOVER COMPLETE SD-ATT-BSC3 MSC QUEUEING INDICATION SABM HANDOVER REQUEST SD -ATT-BSC3: Attempted TCH seizures (all) Successful SDCCH Seizures Description: in immediate assignment procedure, assignment procedure, and handover procedure, this item is measured when BSC receives the notification from MS that MS has successfully seized the assigned SDCCH. Measurement point: − In immediate SDCCH assignment procedure, this item is measured when BSC receives CHANNEL ACTIVATION ACKNOWLEDGE message from BTS. − In the process of incoming BSC handover on SDCCH, BTS sends HANDOVER DETECTION message to BSC. This item is measured when BSC receives HANDOVER DETECTION. − In the process of incoming internal inter cell handover and intracell handover in BSC, BTS sends HANDOVER DETECTION message to BSC. BSC measures this item in the target cell when receiving this message. Formula: none Attempted SDCCH Seizures Meeting SDCCH Overflow Description: in immediate assignment procedure and handover procedure, this item is measured if there is no available SDCCH for assignment when MS or MSC requests BSS to assign SDCCH. Measurement point: this item is measured if there is no available SDCCH when SDCCH is requested in the following cases: − BSC receives CHANNEL REQUIRED message from BTS. − BSC receives Intercell Handover Request message from other cell in the same BSC. − BSC receives HANDOVER REQUEST message from other BSC. Formula: none
  31. 31. M900/M1800 Base Station Controller Traffic Statistic Manual - Volume I 3 Traffic Statistic Items Issue 02 (2008-10-07) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd 3-27 SDCCH Call Drop Description: in immediate assignment procedure and handover procedure, BSC measures SDCCH call drop when the process implementation fails due to some reason after MS has accessed the SDCCH assigned by BSC. Or this item is measured when call drop takes place due to some reason when MS is in normal seizure of SDCCH. After the above cases occur, BSC sends CLEAR REQUEST message to MSC. Measurement point: − This item is measured when BSC receives ERROR INDICATION message from BTS due to an abnormal case for a radio link layer connection. − This item is measured when BSC receives CONNECTION FAILURE INDICATION message from BTS because an active connection has been broken for some reason such as SDCCH link failure or hardware failure (see GSM 0508 for details). − In incoming BSC handover procedure on SDCCH, this item is measured in the target cell in the case of the failure of decoding HANDOVER DETECTION and HANDOVER COMPLETE message. − In the process of incoming BSC handover on SDCCH, this item is measured in the target cell when the timer for the target cell to wait for the HANDOVER COMPLETE message expires. − In the process outgoing BSC handover on SDCCH, this item is measured when the timer for the source cell to wait for CLEAR COMMAND message from MSC expires (T8 expires). − In the process of intra BSC handover on SDCCH, this item is measured in the source cell when the timer for the source cell or the target cell to wait for HANDOVER COMPLETE message expires. − This item is measured when the RSL link of the TRX that the call is running on disconnect, which will cause call drop, this item measures call drop on SDCCH for RSL disconnection. Formula: none Assignment Requests Description: the initial random access by the MS and "Immediate Assignment" to a DCCH is handled autonomously by the BSS without reference to the MSC. After the RR connection is established between MS and BSS, MS establishes the MM and CC connection with MSC on this channel. MSC allocates or reallocates to the MS a radio (and possibly terrestrial) resource in ASSIGNMENT REQUEST message according to MS’s CC connection request. Measurement point: as shown in Figure 3-20 A1, this item is measured when BSC receives ASSIGNMENT REQUEST message from MSC. Formula: none
  32. 32. 3 Traffic Statistic Items M900/M1800 Base Station Controller Traffic Statistic Manual - Volume I 3-28 Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd Issue 02 (2008-10-07) Figure 3-20 Assignment implementation process MS BTS BSC ASSIGN CMMAND A1 MSC ASSIGNMENT REQUEST SABM UA ESTABLISH INDICATION ASSIGNMENT COMPLETE (directly retry)HANDOVER REQIRED MODE (MODIFY) MODE (MODIFY) ACKNOLEDGE (NEGATIVE ACKNOWLEDGE,REJECT) (directly retry)HANDOVER FAILURE(REQUEST ACKNOWLEDGE) CHANNEL ACKTIVATION CHANNEL ACKTIVATION ACKNOWLEDGE (NACK) ASSIGNMENT COMPLETE In Immediate Assignment or IntraBSC Handover ASS FAILURE H 4 B 2 B 3 B 4B 5 C1 C 2 D1 E1 F1 F1 F2 F3 F3 F3 G1 G 2 G 3 G4 G6 G5 G5 B6 H 2 H 3 H 3 ASS FAILURE ASS FAILURE A1: Assignment requests B2-B6: Unsuccessful assignments (equipment failure) C1-C2: Unsuccessful assignments (requested terrestrial resource unavailable) D1: Unsuccessful assignments (terrestrial circuit already allocated) E1:Unsuccessful assignments (invalid message contents)) F1-F3: Unsuccessful assignments (radio interface failure, reversion to previous channel)) G1-G6: Unsuccessful assignments (no radio resource available)) H2-H4: Unsuccessful assignments (other causes)) Unsuccessful Assignments Description: BSS might fail to implement the assignment procedure due to some reason after receiving ASSIGNMENT REQUEST message from MSC.
  33. 33. M900/M1800 Base Station Controller Traffic Statistic Manual - Volume I 3 Traffic Statistic Items Issue 02 (2008-10-07) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd 3-29 The relation between queues, directed retry and mode modify in assignment procedure. In assignment procedure, upon reception of ASSIGNMENT REQUEST message, BSC first checks CIC resource, then analyzes the CHANNEL TYPE in the message (See GSM 0808), at last compares the analyzed CHANNEL TYPE with the currently seized one. The comparison result leads to three types of options: mode modify, directed retry, or requesting a new channel. CHANNEL TYPE contains channel rate and type and traffic type (speech/data indicator), speech encoding algorithm and transparency indicator. The channel re-allocation is initiated if the channel rate or type is different. The mode modify is initiated if the traffic type (speech/data indicator), or speech encoding algorithm/transparency indicator is different. If all are consistent, the system uses the existing radio channel and allocates CIC for BSC net-drive. So there are 5 subsequent processes after the reception of ASSIGNMENT REQUEST. 1. Mode modify. 2. Queue (if there is no available channel during re-allocation and the system supports queue). 3. Directed retry (if there is no available channel during re-allocation and the system supports directed retry). 4. No available channel after the queue timeout; directed retry again if the system supports directed retry. 5. Normal assignment: new channel is assigned, activated, and then is normally seized by the MS. Measurement point: as shown in Figure 3-20 if BSS fails to respond to ASSIGNMENT COMPLETE message to MSC due to some reason after receiving ASSIGNMENT REQUEST message, this item is measured and BSS responds ASSIGNMENT FAILURE message to MSC simultaneously. Figure 3-20 shows the reasons for unsuccessful assignment. This item is measured for the unsuccessful assignment caused by any of these reasons. Formula: none Unsuccessful Assignments (Equipment Failure) Description: the sum of unsuccessful assignments due to equipment failure. See Unsuccessful Assignments for the process. Measurement point: as shown in Figure 3-20 B2~B6, this item is measured in the following case. − In assignment procedure, BSC assigns terrestrial circuit according to the CIC specified by MSC but the assignment fails. In this case, this item is measured and BSC requests MSC to clear the connection simultaneously. − In assignment procedure, this item is measured if BSC’s AM/CM net-drive fails (AM/CM returns net-drive failure or responds timeout) after the mode modify is implemented and the radio channel has been successfully modified according to the CHANNEL TYPE required by MSC. − If mode modify is initiated in assignment procedure, this item is measured when BSC receives MODE MODIFY NEGATIVE ACKNOWLEDGE message from BTS indicating the failure of mode modify after the MODE MODIFY message is sent to BTS. − If mode modify is initiated in assignment procedure, this item is measured when the timer for BSC to wait for the response expires after the MODE MODIFY message has been sent to BTS. − In assignment procedure, this item is measured when BSC receives Channel Activation NACK or the timer for BSC to wait for Channel Activation ACK expires. Formula: none
  34. 34. 3 Traffic Statistic Items M900/M1800 Base Station Controller Traffic Statistic Manual - Volume I 3-30 Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd Issue 02 (2008-10-07) Unsuccessful Assignments (Requested Terrestrial Resource Unavailable) Description: Unsuccessful assignments due to the requested terrestrial resource unavailable. See Unsuccessful Assignments for the process. Measurement point: as shown in Figure 3-20 C1~C2: − This item is measured when BSC detects the state of CIC requested in the ASSIGNMENT REQUEST message received from MSC is unavailable. − This item is measured when AM/CM net-drive fails (AM/CM returns net-drive rejection or timer for waiting for AM/CM expires) in assignment procedure,. − Formula: none Unsuccessful Assignments (Terrestrial Circuit Already Allocated) Description: unsuccessful assignments due to terrestrial circuit already allocated. See Unsuccessful Assignments for the process. Measurement point: as shown in Figure 3-20 D1, in assignment procedure, this item is measured when BSC detects the CIC requested in the ASSIGNMENT REQUEST message received from MSC has already been allocated. Formula: none Unsuccessful Assignments (Invalid Message Contents) Description: unsuccessful assignments due to invalid message contents. See Unsuccessful Assignments for the process. Measurement point: as shown in Figure 3-20 E1, this item is measured when BSC detects the ASSIGNMENT REQUEST message contains invalid contents during the message decoding, Which includes CHANNEL TYPE, CIC, Layer 3 header information. Formula: none Unsuccessful Assignments (Radio Interface Failure, Reversion To Previous Channel) Description: unsuccessful assignments due to radio interface failure with reversion to previous channel Measurement point: as shown in Figure 3-20 F1-F3: − BSC measures this item when MS fails to access the new channel and reverses to the old signaling channel due to Um interface failures after it receives the ASSIGNMENT COMMAND message. − in assignment procedure, after sending the ASSIGNMENT COMMAND message, if the timer for BSC to wait for ASSIGNMENT COMPLETE message from MS expires, BSC measures this item and informs MSC to clear the connection simultaneously. Formula: none Unsuccessful Assignments (No Radio Resource Available) Description: unsuccessful assignments due to no radio resource available. See Unsuccessful Assignments for the process. Measurement point: as shown in Figure 3-20 G1-G6, − This item is measured when BSC does not support the assigned channel.
  35. 35. M900/M1800 Base Station Controller Traffic Statistic Manual - Volume I 3 Traffic Statistic Items Issue 02 (2008-10-07) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd 3-31 − This item is measured if there is no available channel when BSC assigns the channel after receiving ASSIGNMENT REQUEST message and BSC does not support queue and directed retry. − If mode modify is initiated in assignment procedure, the CHANNEL MODE MODIFY message is sent to the MS, then the MS implement mode modify and response CHANNEL MODE MODIFY ACKNOWLEDGE to BSC. This item is measured when BSC receives this message from MS but meets error when decode channel mode IE. − If there is no available channel when BSC receives ASSINGMENT REQUEST message and the system supports queue, the assignment procedure waits for channel resource; if idle channel is available before the timer expires, the system allocates the channel successfully and the assignment procedure goes normally; if there still no available channel resource after the timer expires and the call doesn’t support directed retry, BSC measures the unsuccessful assignment due to channel unavailable. − If directed retry fails, this item is measured and ASSIGNMENT FAILURE message is sent to MSC to request to clear the connection if the source cell of directed retry is in one of the following cases. a) There is no available target cell in the MR reported from MS, for directed retry selects the target cell of handover according to the MR. b) This item is measured in the source cell if the source cell receives Intercell Handover Reject message from the target cell when directed retry is trying to select other cell in the BSC. c) This item is measured in the source cell if the MS reverses to the original signaling channel when directed retry is trying to select other cell in the BSC. d) This item is measured in the source cell when the timer for source cell to wait for response from target cell expires when directed retry is trying to select other cell in the BSC. e) When directed retry is trying to select other cell in the BSC, the source cell receives Inter Clear Request message (Huawei defined message) from the target cell. However this message is not the one to inform the handover completion but to inform the source cell of the directed retry failure and to request to clear the connection. In this case, this item is measured in the source cell. f) When directed retry is trying to select other cell in the BSC, the source cell sends HANDOVER COMMAND to MS to request the MS to access the new channel. This item is measured if the source cell has not received Inter Clear Request message (Huawei defined message) from the target cell after the timer expires. If directed retry is trying to select the target cell in other BSC and the directed retry process fails, the source cell does not return assignment failure and the failure is not measured as an assignment failure item. The failure is processed according to handover procedure. Formula: none Unsuccessful Assignments (Other Causes) Description: unsuccessful assignments due to the following causes. See Unsuccessful Assignments for the process. Measurement point: as shown in Figure 3-20 H2-H4, − When BSC detects IEs, such as, channel rate and type, speed encoding algorithm, is incorrectly described in ASSIGNMENT REQUEST message.
  36. 36. 3 Traffic Statistic Items M900/M1800 Base Station Controller Traffic Statistic Manual - Volume I 3-32 Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd Issue 02 (2008-10-07) − In assignment procedure, BSC measures the item if the timer for BSC to wait for ESTABLISH INDICATION expires when the ASSIGNMENT COMMAND message has been sent to MS In this case BSC sends clear request to MSC to clear the connection simultaneously. − If mode modify is initiated in assignment procedure, BSC does not receive the acknowledge message from MS after sending mode modify message, which leads to the timeout of BSC. Formula: none Unsuccessful Channel Activation During Assignment (NACK) Description: See Unsuccessful Assignments. Measurement point: this item is measured when BSC receives CHANNEL ACTIVATION NEGATIVE ACKNOWLEDGE message from BTS after sending CHANNEL ACTIVATION message to BTS to activate the newly- allocated channel. Formula: none Channel Activation Timeout During Assignment Description: See Unsuccessful Assignments. Measurement point: this item is measured when the timer for BSC to wait for CHANNEL ACTIVATION ACKNOWLEDGE from BTS expires after sending CHANNEL ACTIVATION message to BTS to activate the newly- allocated channel. Formula: none Sum of TCH Measurements (Excluding Very Early Assignment) Description: This item measures the number of occupied TCH of BSC within the measurement period (excluding the very early assignment). This item reflects the situation that the MSs within a BSC occupy the TCH resources from the aspect of occupied TCH number. Measurement point: the system measures the busy TCH number (excluding the very early assignment) every 5 seconds and sums the measurement value of each sampling point and then divides the total value by the sampling times. Formula: none Sum of 1800/1900 Cell TCH Measurements(Excluding Very Early Assignment) 1. Description: This item measures the number of occupied TCH of 1800/1900 cell within the measurement period (excluding the very early assignment). This item reflects the situation that the MSs within an 1800/1900 cell occupy the TCH resources from the aspect of occupied TCH number. Measurement point: the system measures the busy TCH number (excluding the very early assignment) every 5 seconds and sums the measurement value of each sampling point and then divides the total value by the sampling times.. Formula: none Sum of Full Rate TCH Measurements (Excluding Very Early Assignment) Meaning: This item measures the number of occupied full rate TCH of BSC within the measurement period (excluding the very early assignment). This item reflects the
  37. 37. M900/M1800 Base Station Controller Traffic Statistic Manual - Volume I 3 Traffic Statistic Items Issue 02 (2008-10-07) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd 3-33 situation that the MSs within a BSC occupy the full rate TCH resources from the aspect of occupied full rate TCH number. Measurement point: the system measures the busy full rate TCH number (excluding the very early assignment) every 5 seconds and sums the measurement value of each sampling point and then divides the total value by the sampling times. Formula: None. Sum of Half Rate TCH Measurements (Excluding Very Early Assignment) Meaning: This item measures the number of occupied half rate TCH of BSC within the measurement period (excluding the very early assignment). This item reflects the situation that the MSs within a BSC occupy the half rate TCH resources from the aspect of occupied half rate TCH number. Measurement point: the system measures the busy half rate TCH number (excluding the very early assignment) every 5 seconds and sums the measurement value of each sampling point and then divides the total value by the sampling times. Formula: None. Sum of 1800/1900 Cell Full Rate TCH Measurements (Excluding Very Early Assignment) Meaning: This item measures the number of occupied full rate TCH of 1800/1900 cell within the measurement period (excluding the very early assignment). This item reflects the situation that the MSs within an 1800/1900 cell occupy the full rate TCH resources from the aspect of occupied full rate TCH number. Measurement point: the system measures the busy full rate TCH number (excluding the very early assignment) every 5 seconds and sums the measurement value of each sampling point and then divides the total value by the sampling times. Formula: None. Sum of 1800/1900 Cell Half Rate TCH Measurements (Excluding Very Early Assignment) Meaning: This item measures the number of occupied half rate TCH of 1800/1900 cell within the measurement period (excluding the very early assignment). This item reflects the situation that the MSs within an 1800/1900 cell occupy the half rate TCH resources from the aspect of occupied half rate TCH number. Measurement point: the system measures the busy half rate TCH number (excluding the very early assignment) every 5 seconds and sums the measurement value of each sampling point and then divides the total value by the sampling times. Formula: None. Sum of Configured TRX in the BSC Description: the sum of actually configured TRXs in the BSC. Measurement point: the configured TRXs that are shown in statistic database as "install" are measured every time at the end of a statistic cycle. Formula: none Sum of Available TRX in the BSC Description: sum of TRXs that managed by BSC and are in normal use state.
  38. 38. 3 Traffic Statistic Items M900/M1800 Base Station Controller Traffic Statistic Manual - Volume I 3-34 Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd Issue 02 (2008-10-07) Measurement point: this item is measured at the end of a statistic cycle. Formula: none Assignment Requests With Signaling Channel Meaning: When there is a short message sent to a MS which is engaged in a conversation (seizing a TCH), MSC may issue ASSIGNMENT REQUEST to assign a signaling channel for short message transmission. Since MS has already seized voice channel after channel assignment, and this voice channel can be used to send short message, BSC only needs to return ASSIGNMENT COMPLETE to MSC indicating that channel assignment is completed. After conversation and short message is complete, MSC issues CLEAR COMMAND to initiate release procedure. This item provides the times of ASSIGNMENT REQUEST from MSC to BSC being used to establish signaling connections. Measurement point: As shown in Figure 3-21 A, this item is measured when BSC receives ASSIGNMENT REQUEST from MSC which is used to assign resource for signaling connection establishment. Formula: None. Figure 3-21 Signaling channel request procedure BSC A MSC B ASSIGNMENT REQUEST ASSIGNMENT COMPLETE ACTIVE CALL A: Times of signaling channel assignment request B: Times of successful signaling channel assignment Successful Assignments With Signaling Channel Meaning: When there is a short message sent to a MS which is engaged in a conversation (seizing a TCH), iMSC may issue ASSIGNMENT REQUEST to assign a signaling channel for short message transmission. Since MS has already seized voice channel after channel assignment, and this voice channel can be used to send short message, BSC only needs to return ASSIGNMENT COMPLETE to MSC indicating that channel assignment is completed. After conversation and short message is complete, MSC issues CLEAR COMMAND to initiate release procedure. This item provides the times of ASSIGNMENT REQUEST from MSC to BSC beng used to establish signaling connections, and after which BSC returns ASSIGNMENT COMPLETE to MSC. Measurement point: As shown in Figure 3-21 B, this item is measured when BSC returns ASSIGNMENT COMPLETE to MSC after BSC receives ASSIGNMENT REQUEST from MSC which is used to assign resource for signaling connection establishment. Formula: None.
  39. 39. M900/M1800 Base Station Controller Traffic Statistic Manual - Volume I 3 Traffic Statistic Items Issue 02 (2008-10-07) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd 3-35 Average number of A-interface circuits(uninstall) Meaning: the average circuit number that are in the “not installed” state in the A interface within a statistic period. Measurement point: BSC measures the circuit number that are in the unconfigured state in the A interface every 5 seconds. Formula: None. Average number of A-interface circuits(Fault) Meaning: the average circuit number that are in the faulty state in the A interface within a statistic period. Measurement point: BSC measures the faulty circuit number in the A interface every 5 seconds. Formula: None. Average number of A-interface circuits(Maintenance) Meaning: the average circuit number that are in the maintenance state in the A interface within a statistic period. Measurement point: BSC measures the circuit number that are in the maintenance state in the A interface every 5 seconds. Formula: None. Average number of A-interface circuits(Blocked) Meaning: the average circuit number whose local ends are in the blocked state in the A interface within a statistic period. Measurement point: BSC measures the circuit number whose local ends are in the blocked state in the A interface every 5 seconds. Formula: None. Average number of A-interface circuits(Idle) Meaning: the average circuit number that are in the idle state in the A interface within a statistic period. Measurement point: BSC measures the circuit number that are in the idle state in the A interface every 5 seconds. Formula: None. Average number of A-interface circuits(Busy) Meaning: the average circuit number that are in the busy state in the A interface within a statistic period. Measurement point: BSC measures the circuit number that are in the busy state in the A interface every 5 seconds. Formula: None. Average number of A-interface circuits(Opposite Uninstall) Meaning: the average circuit number whose peer ends are in the “not installed” state in the A interface within a statistic period.
  40. 40. 3 Traffic Statistic Items M900/M1800 Base Station Controller Traffic Statistic Manual - Volume I 3-36 Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd Issue 02 (2008-10-07) Measurement point: BSC measures the circuit number whose peer ends are in the blocked state in the A interface every 5 seconds. Formula: None Number of Configured A-Interface Circuits Meaning: the average circuit number in the A interface within a statistic period. Measurement point: None. Formula: Average+Average number of A-interface circuits+Average number of A-interface circuits+Average number of A-interface circuits(Blocked) + Average number of A-interface circuits(Idle) + Average number of A-interface circuits(Busy) + Average number of A-interface circuits(Opposite Uninstall) Percent of A-Interface Circuit (Uninstall) (%) Meaning: the ratio of Average number of A-interface circuits to Number of Configured A-Interface Circuits. Measurement point: None. Formula: Average / Number of Configured A-Interface Circuits Percent of A-Interface Circuit (Fault) (%) Meaning: the ratio of Average number of A-interface circuits to Number of Configured A-Interface Circuits Measurement point: None. Formula: Average / Number of Configured A-Interface Circuits Percent of A-Interface Circuits (Maintenance) (%) Meaning: the ratio of Average number of A-interface circuits to Number of Configured A-Interface Circuits Measurement point: None. Formula: Average / Number of Configured A-Interface Circuits Percent of A-Interface Circuits (Blocked) (%) Meaning: the ratio of Average number of A-interface circuits(Blocked) to Number of Configured A-Interface Circuits Measurement point: None. Formula: Average / Number of Configured A-Interface Circuits Percent of A-Interface Circuits (Idle) (%) Meaning: the ratio of Average number of A-interface circuits(Idle) to Number of Configured A-Interface Circuits Measurement point: None. Formula: Average / Number of Configured A-Interface Circuits Percent of A-Interface Circuits (Busy) (%) Meaning: the ratio of Average A-interface circuits (Busy) to Number of Configured A-Interface Circuits
  41. 41. M900/M1800 Base Station Controller Traffic Statistic Manual - Volume I 3 Traffic Statistic Items Issue 02 (2008-10-07) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd 3-37 Measurement point: None. Formula: Average A-interface circuits (Busy) / Number of Configured A-Interface Circuits Percent of A-Interface Circuits (Opposite Uninstall) (%) Meaning: the ratio of Average number of A-interface circuits(Opposite Uninstall) to Number of Configured A-Interface Circuits Measurement point: None. Formula: Average / Number of Configured A-Interface Circuits TCH Channel Allocation Failure (No Available License) Meaning: because no idle half rate is available. Measurement Point: this item is measured when there is no available TCH when License controls BSC to request TCH. Formula: none. Circuit Paging Success Rate Description: See Successful Circuit Pagings of Abis Interface and Number of PAGING REQUESTs for CS Service on the A Interface and Number of PAGING REQUESTs for CS Service on the Pb Interface. Measurement point: none. Formula: Successful circuit paging of Abis interface / (Number of PAGING REQUESTs for CS Service on the A Interface + Number of PAGING REQUESTs for CS Service on the Pb Interface.) Ratio of Paging Channel Overloads (%) Description: This item measures the percentage of PCH overloads in the paging commands to BTS. See Interface, and Packet Paging Commands to BTS. Measurement point: none. Formula: Circuit paging PCH overloads of Abis interface / (Circuit paging commands to BTS + Packet paging commands to BTS) Rate of Sending Immediate Assignment Command Description: See Immediate Assignment Transmissions and Immediate Assignment Requests. Measurement point: none. Formula: Immediate assignment transmissions / Immediate assignment requests TCH Call Drop Rate (%) Description: This item measures the percentage of TCH call drops in successful TCH seizures. See TCH Call Drop and Successful TCH Seizures. Measurement point: none. Formula: TCH call drop / Successful TCH seizures
  42. 42. 3 Traffic Statistic Items M900/M1800 Base Station Controller Traffic Statistic Manual - Volume I 3-38 Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd Issue 02 (2008-10-07) Traffic Volume (Excluding Very Early Assignment) (Erl) Description: This item measures the total traffic volume of all cells in a BSC, excluding the traffic volume during very early assignment, that is the average number of busy TCHs(excluding very early assignment) after all TCHs of all cells are scaned. Measurement point: None. Formula: None. Traffic Volume Of 1800/1900 Cell (Excluding Very Early Assignment) (Erl) Description: This item measures the total traffic volume of all GSM 1800/1900 cells in a BSC, excluding the traffic volume during very early assignment, that is the average number of busy TCHs(excluding very early assignment) of 1800/1900 cells after all TCHs of all 1800/1900 cells are scaned. Measurement point: none. Formula: None. Percentage of TRX In Good Condition (%) Description: This item measures the percentage of good TRXs in total configured TRXs. See Sum of Available TRX in the BSC and Sum of Configured TRX in the BSC. Measurement point: none. Formula: Sum of available TRX in the BSC / Sum of configured TRX in the BSC SDCCH Call Drop Rate (%) Description: This item measures the percentage of SDCCH call drops successful SDCCH seizures. See SDCCH Call Drop and Successful SDCCH Seizures. Measurement point: none. Formula: SDCCH call drop / Successful SDCCH seizures SDCCH Congestion Rate (SDCCH Overflow) (%) Description: This item measures the percentage of the attempted SDCCH seizures meeting congestion in total attempted SDCCH seizures. See Attempted SDCCH Seizures Meeting SDCCH Overflow and Attempted SDCCH Seizures (all). Measurement point: none. Formula: Attempted SDCCH seizures meeting an SDCCH blocked state / Attempted SDCCH seizures (all) Full Rate Traffic Volume (Excluding Very Early Assignment) (ERL) Meaning: This item provides the traffic volume on full rate TCHs of all cells (including 900/850 and 1800/1900) of the measured BSC, excluding the traffic on full rate TCH of very early assignment, that is, the average number of busy full rate TCHs(excluding very early assignment) after all full rate TCHs of all cells are scaned. Measurement point: None. Formula:None
  43. 43. M900/M1800 Base Station Controller Traffic Statistic Manual - Volume I 3 Traffic Statistic Items Issue 02 (2008-10-07) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd 3-39 Half Rate Traffic Volume (Excluding Very Early Assignment) (ERL) Meaning: This item provides the traffic volume on half rate TCHs of all cells (including 900/850 and 1800/1900) of the measured BSC, excluding the traffic on half rate TCH of very early assignment, that is, the average number of busy half rate TCHs (excluding very early assignment) after all half rate TCHs in all cells are scaned Measurement point: None. Formula:None. Full rate Traffic Volume Of 1800/1900 Cell (Excluding Very Early Assignment) (ERL) Meaning: This item provides the traffic volume on full rate TCHs of all 1800/1900 cells of the measured BSC, excluding the traffic on full rate TCH of very early assignment, that is, the average number of busy full rate TCHs (excluding very early assignment) after all full rate TCHs of 1800/1900 cells are scaned. Measurement point: None. Formula: None. Half Rate Traffic Volume Of 1800/1900 Cell (Excluding Very Early Assignment) (ERL) Meaning: This item provides the traffic volume on half rate TCHs of all 1800/1900 cells of the measured BSC, excluding the traffic on half rate TCH of very early assignment, that is, the average number of busy half rate TCHs (excluding very early assignment) after all half rate TCHs in 1800/1900 cells are scaned. Measurement point: None. Formula: None 3.1.3 Access Measurement Function(2) All the statistic items of Access Measurement Function (2) are listed in Table 3-2. Table 3-2 Statistic items in Access measurement function items(2) 1 Configured SDCCHs 2 Available SDCCHs 3 Configured TCHs 4 Available TCHs 5 Available SDCCH rate 6 Available TCH rate Configured SDCCHs Description: This item provides the real-time number of configured SDCCHs, including the SDCCH converted from the dynamic TCH. It is an average of configured SDCCHs obtained in a sample measurement period.
  44. 44. 3 Traffic Statistic Items M900/M1800 Base Station Controller Traffic Statistic Manual - Volume I 3-40 Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd Issue 02 (2008-10-07) Measurment point: the system acquires the number of configured SDCCHs every five seconds. By the end of the measurement period, the system devides the sum of all sample data obtained in the period by sampling times to calculate the average configured SDCCHs measured in the measurment period. Formula: none. Available SDCCHs Description: This item provides the number of available SDCCHs (including the SDCCH converted from the dynamic TCH) which are in idle or busy status in the BSC system. It is an average number of available SDCCHs obtained in a sample measurement period. Measurement point: the system acquires the number of available SDCCHs every five seconds. By the end of the measurement period, the system devides the sum of all sample data obtained in the period by sampling times to calculate the average available SDCCHs measured in the measurment period. Formula: none. Configured TCHs Description: This item provides the real-time number of configured TCHs (besides the dynamical TCHs converted into SDCCHs but includes the TCHs converted from dynamic PDCHs). It is an average of configured TCHs obtained in a sample measurement period. Measurement point: the system acquires the number of configured TCHs every five seconds. By the end of the measurement period, the system devides the sum of all sample data obtained in the period by sampling times to calculate the average configured TCHs measured in the measurment period. Formula: none. Available TCHs Description: This item provides the number of available TCHs (besides the dynamical TCHs converted into SDCCHs but includes the TCHs converted from dynamic PDCHs) which are in idle or busy status in the BSC system. It is an average number of available TCHs obtained in a sample measurement period. Measurement point: the system acquires the number of available TCHs every five seconds. By the end of the measurement period, the system devides the sum of all sample data obtained in the period by sampling times to calculate the average available TCHs measured in the measurment period. Formula:none. Available SDCCH rate Description: This item provides the percentage (%) of available SDCCHs to configured SDCCHs. See Available SDCCHs, Configured SDCCHs. Measurement point: none. Formula: Available SDCCHs/Configured SDCCHs Available TCH rate Description: This item provides the percentage (%) of available TCHs to configured TCHs. See Available TCHs,. Configured SDCCHs
  45. 45. M900/M1800 Base Station Controller Traffic Statistic Manual - Volume I 3 Traffic Statistic Items Issue 02 (2008-10-07) Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd 3-41 Measurement point: none. Formula: Available TCHs/Configured TCHs 3.1.4 Handover Measurement Function(1) All the statistic items of Handover Measurement Function(1) are listed in Table 3-3. Table 3-3 Statistic items in Handover measurement function(1) items No. Item name 1 Attempted Intracell Handovers 2 Successful Intracell Handovers 3 Unsuccessful Intracell Handovers, 4 Attempted Intercell Handovers 5 Intercell Handovers 6 Attempted Intercell Handovers (900/850(1800/1900) 7 Attempted Intercell Handovers (1800/1900(900/850) 8 Successful Intercell Handovers 9 Successful Intercell Handovers (900/850(1800/1900) 10 Successful Intercell Handovers (1800/1900(900/850) 11 Intra BSC Handovers 12 Attempted Incoming BSC Handovers 13 Attempted Incoming BSC Handovers (900/850(1800/1900) 14 Attempted Incoming BSC Handovers (1800/1900(900/850) 15 Attempted Incoming BSC Handovers (to 900/850) 16 Attempted Incoming BSC Handovers (to 1800/1900) 17 Successful Incoming BSC Handovers 18 Successful Incoming BSC Handovers (900/850(1800/1900) 19 Successful Incoming BSC Handovers (1800/1900(900/850) 20 Successful Incoming BSC Handovers (to 900/850) 21 Successful Incoming BSC Handovers (to 1800/1900) 22 Unsuccessful Incoming BSC Handovers 23 Unsuccessful Incoming BSC Handovers (Equipment Failure) 24 Unsuccessful Incoming BSC Handovers (Requested Terrestrial Resource Unavailable) 25 Unsuccessful Incoming BSC Handovers (Terrestrial Circuit Already Allocated)

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