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GSM BSS Network KPI (SDCCH Congestion Rate)
Optimization Manual
INTERNAL
BOM Code Product Name GSM BSC
Confidentiality
Level
INTERNAL Product
Version
V1.1
Compiling
Department
Document
Version
Total 31 pages
GSM BSS Network KPI (SDCCH Congestion Rate) Optimization Manual
(For internal use only)
Prepared by GSM&UMTS Network
Performance Research
Department
Date 2008-05-19
2014-06-18 HUAWEI Confidential Page1, Total18
GSM BSS Network KPI (SDCCH Congestion Rate)
Optimization Manual
INTERNAL
Yang Chunjie
Reviewed by Date
Reviewed by Date
>Approved
by
Date
Huawei Technologies Co., Ltd.
All rights reserved
2014-06-18 HUAWEI Confidential Page2, Total18
GSM BSS Network KPI (SDCCH Congestion Rate)
Optimization Manual
INTERNAL
Revision Record
Date Revision
Version
Description Author
2008-05-19 V1.0 Draft completed Yang Chunjie
00119951
2008-06-02 V1.0 Adjust the sequence of
problem location and
add some suggestions of
adjusting the related
parameters affecting
SDCCH congestion rate
according to the advices
of the experts in our
team and the experts of
network optimization
and planning.
Yang Chunjie
00119951
References
Num
ber
Reference Author Date
1 Guide to Optimization of SDCCH
Congestion Rate
Wang Weiji,
Yang Haiquan
2006-12-20
2 Baseline Specification of GSM BSS
Network KPI (SDCCH Congestion
Rate)
Wu Zhen 2007-04-09
2014-06-18 HUAWEI Confidential Page3, Total18
GSM BSS Network KPI (SDCCH Congestion Rate)
Optimization Manual
INTERNAL
Contents
1 Principles of SDCCH Congestion Rate .....................................................................5
1.1 Definition..............................................................................................................................5
1.2 SDCCH Seizure.....................................................................................................................6
1.3 Signaling Procedure and Measurement Points.....................................................................6
2 Factors of SDCCH Congestion Rate in GSM.............................................................6
2.1 Congestion Caused by Faults on Equipment or Transmission.............................................6
2.2 Congestion Caused by Insufficient Signaling Resources.....................................................7
2.3 Congestion Caused by Improper Data Configuration..........................................................7
2.4 Congestion Caused by Interference......................................................................................7
3 Optimazation Method of SDCCH Congestion............................................................7
3.1 Analysis Procedure of SDCCH Congestion Rate.................................................................7
3.2 Optimazation Method of SDCCH Congestion Rate.............................................................9
3.2.1 Checking Hardware....................................................................................................9
3.2.2 Checking Channel Configuration..............................................................................9
3.2.3 Checking Data Configuration..................................................................................11
3.2.4 Checking the Um Interface......................................................................................12
4 Test Method...............................................................................................................13
5 Case Analysis of SDCCH Congestion Rate..............................................................14
5.1 Congestion Caused by Improper Configuration of Power.................................................14
5.2 SDCCH Congesiton Caused by Improper Configuration of LAC.....................................14
6 Feedbacks on High SDCCH Congestion Rate..........................................................15
Appendix Relevant Traffic Counters to BSC6000 SDCCH Congestion Rate...........16
2014-06-18 HUAWEI Confidential Page4, Total18
GSM BSS Network KPI (SDCCH Congestion Rate)
Optimization Manual
INTERNAL
SDCCH Congestion Rate Optimization Manual
Keywords: SDCCH Congestion Rate
Abstract: This document introduces the definition and optimization method of
SDCCH congestion rate.
Abbreviations:
Abbreviation Full Spelling
SDCCH Stand-alone Dedicated Control Channel
1 Principles of SDCCH Congestion Rate
SDCCH congestion rate is one of the important counters that indicate
accessibility in circuit service. This counter provides the ratio of failed SDCCH
seizures due to busy SDCCH to the total requests for the SDCCH. SDCCH
congestion rate indicates the failed requests for the SDCCH for various reasons.
SDCCH congestion rate also indicates the status of the SDCCH resource
utilization.
1.1 Definition
The Huawei definition and formula of SDCCH congestion rate are as follows:
• Definition:
Ratio of failed SDCCH seizures due to busy SDCCH to the total requests for
the SDCCH
• Formula:
SDCCH congestion rate = Failed SDCCH seizures due to busy SDCCH/Total
requests for the SDCCH x 100%
Failed SDCCH Seizures due to Busy SDCCH = [Failed Immediate
Assignment due to Busy Channels or Failed Configurations (SDCCH)] + [Failed
Internal Inter-cell Handovers (No Channel Available) (SDCCH)] + [Failed Incoming
Internal Inter-cell Handovers (No Channel Available) (SDCCH)] + [Failed Incoming
2014-06-18 HUAWEI Confidential Page5, Total18
GSM BSS Network KPI (SDCCH Congestion Rate)
Optimization Manual
INTERNAL
External Handovers (No Channel Available) (SDCCH)]
1.2 SDCCH Seizure
The requests for the SDCCH in GSM are mainly made in the following two
procedures:
A. The procedure for requesting the SDCCH for services such as point-to-point
calls, location updating (only SDCCH), call re-establishment, or short
messages;
B. he procedure of SDCCH handovers (including both the intra-BSC and inter-
BSC handovers)
1.3 Signaling Procedure and Measurement Points
C ha nnel Reque st
C ha nne lRequired
C ha nne l AC T
C ha nne l AC TAC K
Imme dia te a ssignme nt C omma nd
MS BTS BSC
A1
B1
Figure 1 SDCCH requests and failed SDCCH requests due to busy
SDCCH in the immediate assignment procedure
A1: Immediate Assignment Requests
B1: Failed Immediate Channel Assignment due to Busy SDCCHs or Failed
SDCCH Configurations
For details, refer to the Baseline Specification of GSM BSS Network KPI
(SDCCH Congestion Rate).
2 Factors of SDCCH Congestion Rate in GSM
2.1 Congestion Caused by Faults on Equipment or Transmission
The faults on BTS, BSC, and Abis interface, such as broken LAPD link, cause
the SDCCH congestion. The alarm "Excessive Loss of E1/T1 Signals in an Hour" also
causes the SDCCH congestion.
2014-06-18 HUAWEI Confidential Page6, Total18

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03 gsm bss network kpi (sdcch congestion rate) optimization manual

  • 1. GSM BSS Network KPI (SDCCH Congestion Rate) Optimization Manual INTERNAL BOM Code Product Name GSM BSC Confidentiality Level INTERNAL Product Version V1.1 Compiling Department Document Version Total 31 pages GSM BSS Network KPI (SDCCH Congestion Rate) Optimization Manual (For internal use only) Prepared by GSM&UMTS Network Performance Research Department Date 2008-05-19 2014-06-18 HUAWEI Confidential Page1, Total18
  • 2. GSM BSS Network KPI (SDCCH Congestion Rate) Optimization Manual INTERNAL Yang Chunjie Reviewed by Date Reviewed by Date >Approved by Date Huawei Technologies Co., Ltd. All rights reserved 2014-06-18 HUAWEI Confidential Page2, Total18
  • 3. GSM BSS Network KPI (SDCCH Congestion Rate) Optimization Manual INTERNAL Revision Record Date Revision Version Description Author 2008-05-19 V1.0 Draft completed Yang Chunjie 00119951 2008-06-02 V1.0 Adjust the sequence of problem location and add some suggestions of adjusting the related parameters affecting SDCCH congestion rate according to the advices of the experts in our team and the experts of network optimization and planning. Yang Chunjie 00119951 References Num ber Reference Author Date 1 Guide to Optimization of SDCCH Congestion Rate Wang Weiji, Yang Haiquan 2006-12-20 2 Baseline Specification of GSM BSS Network KPI (SDCCH Congestion Rate) Wu Zhen 2007-04-09 2014-06-18 HUAWEI Confidential Page3, Total18
  • 4. GSM BSS Network KPI (SDCCH Congestion Rate) Optimization Manual INTERNAL Contents 1 Principles of SDCCH Congestion Rate .....................................................................5 1.1 Definition..............................................................................................................................5 1.2 SDCCH Seizure.....................................................................................................................6 1.3 Signaling Procedure and Measurement Points.....................................................................6 2 Factors of SDCCH Congestion Rate in GSM.............................................................6 2.1 Congestion Caused by Faults on Equipment or Transmission.............................................6 2.2 Congestion Caused by Insufficient Signaling Resources.....................................................7 2.3 Congestion Caused by Improper Data Configuration..........................................................7 2.4 Congestion Caused by Interference......................................................................................7 3 Optimazation Method of SDCCH Congestion............................................................7 3.1 Analysis Procedure of SDCCH Congestion Rate.................................................................7 3.2 Optimazation Method of SDCCH Congestion Rate.............................................................9 3.2.1 Checking Hardware....................................................................................................9 3.2.2 Checking Channel Configuration..............................................................................9 3.2.3 Checking Data Configuration..................................................................................11 3.2.4 Checking the Um Interface......................................................................................12 4 Test Method...............................................................................................................13 5 Case Analysis of SDCCH Congestion Rate..............................................................14 5.1 Congestion Caused by Improper Configuration of Power.................................................14 5.2 SDCCH Congesiton Caused by Improper Configuration of LAC.....................................14 6 Feedbacks on High SDCCH Congestion Rate..........................................................15 Appendix Relevant Traffic Counters to BSC6000 SDCCH Congestion Rate...........16 2014-06-18 HUAWEI Confidential Page4, Total18
  • 5. GSM BSS Network KPI (SDCCH Congestion Rate) Optimization Manual INTERNAL SDCCH Congestion Rate Optimization Manual Keywords: SDCCH Congestion Rate Abstract: This document introduces the definition and optimization method of SDCCH congestion rate. Abbreviations: Abbreviation Full Spelling SDCCH Stand-alone Dedicated Control Channel 1 Principles of SDCCH Congestion Rate SDCCH congestion rate is one of the important counters that indicate accessibility in circuit service. This counter provides the ratio of failed SDCCH seizures due to busy SDCCH to the total requests for the SDCCH. SDCCH congestion rate indicates the failed requests for the SDCCH for various reasons. SDCCH congestion rate also indicates the status of the SDCCH resource utilization. 1.1 Definition The Huawei definition and formula of SDCCH congestion rate are as follows: • Definition: Ratio of failed SDCCH seizures due to busy SDCCH to the total requests for the SDCCH • Formula: SDCCH congestion rate = Failed SDCCH seizures due to busy SDCCH/Total requests for the SDCCH x 100% Failed SDCCH Seizures due to Busy SDCCH = [Failed Immediate Assignment due to Busy Channels or Failed Configurations (SDCCH)] + [Failed Internal Inter-cell Handovers (No Channel Available) (SDCCH)] + [Failed Incoming Internal Inter-cell Handovers (No Channel Available) (SDCCH)] + [Failed Incoming 2014-06-18 HUAWEI Confidential Page5, Total18
  • 6. GSM BSS Network KPI (SDCCH Congestion Rate) Optimization Manual INTERNAL External Handovers (No Channel Available) (SDCCH)] 1.2 SDCCH Seizure The requests for the SDCCH in GSM are mainly made in the following two procedures: A. The procedure for requesting the SDCCH for services such as point-to-point calls, location updating (only SDCCH), call re-establishment, or short messages; B. he procedure of SDCCH handovers (including both the intra-BSC and inter- BSC handovers) 1.3 Signaling Procedure and Measurement Points C ha nnel Reque st C ha nne lRequired C ha nne l AC T C ha nne l AC TAC K Imme dia te a ssignme nt C omma nd MS BTS BSC A1 B1 Figure 1 SDCCH requests and failed SDCCH requests due to busy SDCCH in the immediate assignment procedure A1: Immediate Assignment Requests B1: Failed Immediate Channel Assignment due to Busy SDCCHs or Failed SDCCH Configurations For details, refer to the Baseline Specification of GSM BSS Network KPI (SDCCH Congestion Rate). 2 Factors of SDCCH Congestion Rate in GSM 2.1 Congestion Caused by Faults on Equipment or Transmission The faults on BTS, BSC, and Abis interface, such as broken LAPD link, cause the SDCCH congestion. The alarm "Excessive Loss of E1/T1 Signals in an Hour" also causes the SDCCH congestion. 2014-06-18 HUAWEI Confidential Page6, Total18
  • 7. GSM BSS Network KPI (SDCCH Congestion Rate) Optimization Manual INTERNAL 2.2 Congestion Caused by Insufficient Signaling Resources The heavy traffic and burst traffic cause the SDCCH congestion. Proper setting of the number of SDCCHs and TCHs, and the SDCCH dynamic conversion function can relieve the congestion. 2.3 Congestion Caused by Improper Data Configuration The SDCCH congestion relates to the relevant parameters of the BSC such as SDCCH Availability, LAC and T3101 (the timer used in the immediate assignment procedure), and T3212 (the timer used for periodic updating). If these parameters are set correctly, the SDCCH congestion can be relieved. In addition, if the assignment procedure is set to Late Assignment, the time of the SDCCH being occupied increases, which may lead to congestion. 2.4 Congestion Caused by Interference Interference on the Um interface also causes congestion. For example, if the main BCCH in the serving cell and the TCH in the neighboring cell share the same TRX frequency and BTS BSIC, the handover access on this TCH may be mistaken as random access. As a result, the SDCCH is abnormally allocated and congestion occurs. The excessive receive sensibility can also make the interference signal mistaken as access signal, which leads to congestion. 3 Optimazation Method of SDCCH Congestion 3.1 Analysis Procedure of SDCCH Congestion Rate SDCCH congestion rate is classified into BSC-level and cell-level according to the statistic object of the counter. The SDCCH congestion rate of a BSC is composed of the SDCCH congestion rate of a series of cells. Compared with the SDCCH congestion rate of the competitors, the Huawei SDCCH congestion rate cannot exclude the congestion in the handover procedure. Few networks are enabled with the function of SDCCH handover; therefore, the formula of SDCCH congestion rate of Huawei is almost the same as that of the competitors. Procedure of SDCCH congestion rate analysis 2014-06-18 HUAWEI Confidential Page7, Total18
  • 8. GSM BSS Network KPI (SDCCH Congestion Rate) Optimization Manual INTERNAL 2014-06-18 HUAWEI Confidential Page8, Total18
  • 9. GSM BSS Network KPI (SDCCH Congestion Rate) Optimization Manual INTERNAL Figure 2 Procedure of SDCCH congestion rate analyses First, determine the level of the SDCCH congestion rate. If the congestion occurs in a large area, check the traffic volume and the setting of T3212. Then, calculate the SDCCH capacity to check whether it meets the system demand and whether the faults exist on system-level equipment or transmission. If congestion occurs in only a few cells, check the hardware, data configuration, and Um interface quality of the cell. 3.2 Optimazation Method of SDCCH Congestion Rate 3.2.1 Checking Hardware Faults on the TRX, BTS, and transmission may cause SDCCH congestion. To see whether there are faults on the hardware, query the alarms of transmission, board communication, CDU VSWR, and clock. In addition, query transmission- related traffic counters such as the CRC frames received by the BTS on the LAPD link in the LAPD performance measurement. 3.2.2 Checking Channel Configuration Query the traffic statistics to see whether the traffic volume on the SDCCH and TCH are higher than the normal value. If the congestion is caused by excessive traffic on the SDCCH, for multi-TRX BTSs, enable SDCCH dynamic allocation function or increase the number of SDCCH channels to relieve the congestion. For cells with only one TRX or without extra channels, enable the very early immediate assignment procedure. In the very early immediate assignment procedure, the TCH channel is immediately assigned when the SDCCH has no available resource during the processing of access request. In this case, a TCH can be used as only one SDCCH, which is a waste of the TCH resources. For the method of computing the capacity, refer to the Guide to Capacity Planning. Some counters related to the BSC6000 are listed in the following table. Ca use s BSC-Level Cell-Level Tra ffic Lo ad Help of Performance Counter Reference > BSC Measurement > Access Measurement per BSC SDCCH Congestion Rate (overflow) (%) ZK3004: Traffic Volume on SDCCH per BSC TS3010: Traffic Volume of Signaling Channels (SDCCH) CS3010: MRs on Signaling Channels (SDCCH) CS3023: Traffic Volume of Speech Service on SDCCH CS3024: Traffic Volume of Short Message Service on SDCCH 2014-06-18 HUAWEI Confidential Page9, Total18
  • 10. GSM BSS Network KPI (SDCCH Congestion Rate) Optimization Manual INTERNAL CS3025: Traffic Volume of USSD Service on SDCCH All the services such as location updating, MS attach/detach, call setup, short messages are performed on the Schiff a certain service causes burst traffic, the SDCCH congestion may occur. In this case, check whether the abnormity of Channel Requests, Successful Immediate Assignments or Successful SDCCH Seizures is caused by the service of location updating, MOC, paging, or short message. Note that you should check the history traffic statistics when querying these traffic counters to see whether they fluctuate during a certain period. The traffic counters related to the SDCCH request and seizure are listed in the following table. By analyzing these counters, you can find out the reason why congestion occurs in the network or cell. If the SDCCH congestion is caused by certain burst services such as location updating and short messages, use the following methods according to the specific configuration of the BTSs. a. For the BTS with multiple TRXs, enable the SDCCH dynamic allocation function or increase the number of SDCCH channels. b. For the cell with only one TRX or without extra channels, enable the immediate assignment procedure. In the immediate assignment procedure, the TCH is immediately assigned when the SDCCH has no available resource during the processing of access request. c. Increase the number of TRXs. It is difficult to avoid the SDCCH congestion caused by network burst services; however, you can take some relief measures such as increasing the number of SDCCHs or enabling the SDCCH dynamic conversion function. Some counters related to burst services of the BSC6000 are listed in the following table. Cause s BSC Cell-Level 2014-06-18 HUAWEI Confidential Page10, Total18
  • 11. GSM BSS Network KPI (SDCCH Congestion Rate) Optimization Manual INTERNAL Troub leshoo ting Burst Traffi c None . A3030A: Call Setup Indications (MOC Non SMS) (SDCCH) A3030B: Call Setup Indications (MOC SMS) (SDCCH) A3030C: Call Setup Indications (MTC) (SDCCH) A3030D: Call Setup Indications (Emergency Call) (SDCCH) A3030E: Call Setup Indications (Call Re- establishment) (SDCCH) A3030F: Call Setup Indications (Location Updating) (SDCCH) A3030G: Call Setup Indications (IMSI Detach) (SDCCH) A3030H: Call Setup Indications (PS Service) (SDCCH) A3030I: Call Setup Indications (SS) (SDCCH) A3030J: Call Setup Indications (LCS) (SDCCH) A3030K: Call Setup Indications (Others) (SDCCH) 3.2.3 Checking Data Configuration The SDCCH congestion relates to the parameter settings of the BSC. If the parameters are set correctly, the SDCCH congestion can be relieved. 1. LAC planning: The LAC setting is very important to the network performance. If the LAC is too great, the signaling flow increases during the paging in the BTSs within the LA, and thus the network load increases. If the LAC is too small, the number of MS location updating increases, and thus the signaling flow of the system increases, which may lead to the SDCCH congestion. Therefore, proper planning of LA can reduce the SDCCH congestion. SDCCH Congesiton Caused by Improper Configuration of LAC 2. SDCCH dynamic allocation: Enabling the SDCCH dynamic allocation function reduces the SDCCH congestion, but also decreases the utilization of the TCH resources. To prevent this problem, set the relevant counters according to the actual situations. 3. Set relevant timers such as T3101 and T3212 properly. Setting the T3101 to a small value can effectively reduce the congestion caused by double SDCCH allocation. If the T3101 is set to an over-great value, the signaling resources are occupied for a long period, which leads to a waste of resources. To optimize the utilization of the signaling resources, set T3101 to a small value, especially when enabling the queuing function. Setting T3212 to a great value can decrease the SDCCH load caused by periodical location updating. If the T3212 is too great, the MS possibly sends no 2014-06-18 HUAWEI Confidential Page11, Total18
  • 12. GSM BSS Network KPI (SDCCH Congestion Rate) Optimization Manual INTERNAL request for location updating. In this case, the MS is identified as implicit off-line, and the system displays "The subscriber you dial is power off" even though the called MS is on. The setting of RACH Min.Access Level may cause SDCCH congestion. If this parameter is set too small, the interference signal access increases and excessive SDCCH requests are initiated, thus leading to the SDCCH congestion. If the parameter is set too great, call failures may occur though there are signals. Therefore, set the parameter according to the actual BTS sensitivity, the lowest MS access level and the interference. 5. In the assignment procedure, if the late assignment is enabled, the calling MS always occupies the SDCCH during the period of waiting for the called party to pick up the phone. Therefore, the time of the SDCCH occupation increases and other MSs may fail to request the SDCCH, thus leading to the SDCCH congestion. 6. The setting of RXLEV_ACCESS_MIN also causes the SDCCH congestion. If the RXLEV_ACCESS_MIN is set too small, the number of MSs that access the network increases. When the MS requests MOC or location updating, the SDCCH congestion may occur. 7. The setting of MS MAX Retrans also causes the SDCCH congestion. To increase the paging success rate, MS MAX Retrans is increased. The BSC may assign multiple SDCCHs to a single MS. Thus, the SDCCH congestion rate increases. 8. Improper setting of power also causes the SDCCH congestion. If the power of the main BCCH is set normal but the power of the TCH on the non-main BCCH TRX is set too small, a power difference band forms. When an MS requests the SDCCH successfully in the power difference band, the TCH cannot be occupied and the time of the SDCCH occupation increases, thus leading to congestion. For details, see section 5.1 "Congestion Caused by Improper Configuration of Power" 3.2.4 Checking the Um Interface Interference on the Um interface also causes congestion. In the network with small space between BTSs and tight BCCH frequency reuses, the system may receive many random interference signals and assign each random access signal a SDCCH. Thus, the congestion occurs. If the immediate assignment success rate and the paging success rate decrease, the RACH during the performance measurement may be overloaded. The traffic measurement counters related to the interference include the number of idle TCHs in interference bands 4 and 5, the rate of bad quality handovers and the TCH seizure failures in the measurement of the call drop performance. The interference of GSM is classified into inter-network interference and intra-network interference. The methods of eliminating the interference are as follows: a. Inter-network Interference For inter-network interference, query the number of idle TCHs in interference bands 4 and 5 to determine whether the uplink interference exists. To eliminate the 2014-06-18 HUAWEI Confidential Page12, Total18
  • 13. GSM BSS Network KPI (SDCCH Congestion Rate) Optimization Manual INTERNAL interference, use a spectrum analyzer and check the network parameters to locate the interference source. Then, adjust or close the interference source. b. Intra-network Interference If the frequency planning and antenna tilt planning are improper, the network cannot achieve high Carrier-to-Interference Ratios (CIRs), which causes intra- frequency or inter-frequency interferences or the SDCCH congestion. The UL frequency and DL frequency are paired, so we can query the interference band to find out the cells with high mean number of SDCCHs in interference band four and five. Then check the frequency planning of the network. Find out the faulty cell, and modify the frequency planning to eliminate the interference. For intra- network interference, perform drive tests. Check the actual distribution of signals to determine whether the interference exists. Then, modify the antenna planning or frequency planning. For detailed methods of checking interference, refer to the G-Guide to Eliminate Interference. The following tables lists some KPIs related to the BSC6000 interference. Cause BSC-Level TRX-Level Interfe rence None. Interference band measurement per TRX AS4200A:Mean Number of SDCCHs in Interference Band 1 AS4200B: Mean Number of SDCCHs in Interference Band 2 AS4200C: Mean Number of SDCCHs in Interference Band 3 AS4200D: Mean Number of SDCCHs in Interference Band 4 AS4200E: Mean Number of SDCCHs in Interference Band 5 S4350D: Radio Link Failures (SDCCH) 4 Test Method The SDCCH congestion rate is one of the KPIs, which can be obtained through the registration or reporting of the related KPIs. Generally, SDCCH congestion rate is not measured through drive tests because of the limited samples, incomplete test routes, and the irregular occurrence of the congestion in areas with low traffic. At present, the vendors and mobile operators use different formulas to calculate the SDCCH congestion rate, thus leading to different values of this counter. In actual measurement, you should register the specific counters and use an appropriate formula to calculate the value of the counter. 2014-06-18 HUAWEI Confidential Page13, Total18
  • 14. GSM BSS Network KPI (SDCCH Congestion Rate) Optimization Manual INTERNAL 5 Case Analysis of SDCCH Congestion Rate 5.1 Congestion Caused by Improper Configuration of Power Description The engineers observe the status of each board of the BTS3001C-204 (configured with two omni-directional antennas) on the LMT and find that they are in normal state. The traffic measurement results, however, show that the congestion rate in this BTS is high (13%). Then the engineers observe the status of the TCH and find that the TCH of TRX1 is idle whereas the TCH and SDCCH of TRX0 are busy. Alarm Information None. [Cause Analysis] The possible reason is that the output power of TRX1 is small and is not detected by the BTS3001C.Most MSs are not assigned a TCH of TRX1 successfully except those close to the BTS. This causes the SDCCH to be occupied for a long time, thus leading to the SDCCH congestion. Handling Procedure a. Block the TCHs of TRX1, and the SDCCH counters are normal. b. Use a power meter to measure the output power of TRX1 and TRX0. The result shows that the output power of TRX1 is very small but that of TRX0 is normal. c. Replace the BTS and all counters are normal. 5.2 SDCCH Congesiton Caused by Improper Configuration of LAC Description The SDCCH Congestion Rate of two cells in a BTS (S1/1/1) is up to 4.91%; however, the traffic of each cell is generally less than 3 Erl. Handling Procedure 1. Query the counters of TCHs and SDCCHs and find that the traffic on TCH is not high with each cell less than 3 Erl. The number of SDCCH seizure requests is large, even reaching 3,032 times during busy hours. The traffic volume is up to 1.86 Erl, and the congestion rate is up to 4.91%. The SDCCH is occupied in the following situations. a. Transmitting the signaling before call setup b. Transmitting the signaling of handover c. Transmitting the signaling of location update in idle mode 3. Normally, the traffic volume on the TCH is 2.79 Erl (the number of available TCHs is 6).The number of TCH seizure requests (including handovers) is 318, which is within the normal range. The number of TCH handover requests is 146, which is also within the normal range. Therefore, the congestion may be caused by frequent location updates. 2014-06-18 HUAWEI Confidential Page14, Total18
  • 15. GSM BSS Network KPI (SDCCH Congestion Rate) Optimization Manual INTERNAL 4. Check the LAC of this BTS and find that it is 0500. The LACs of the cells near this BTS are 0520. Change the LAC of this BTS into 0520. During busy hours, the number of SDCCH seizure requests becomes 298, the congestion rate becomes 0, and the traffic volume becomes 0.27 Erl. Suggestion and Summary 1. Plan the LAC according to the geographical locations and habits of the MSs to minimize the location updates at the edge of a Lifer example, the traffic volume is high in urban areas. If there are more than two LAs, the mountains, rivers, or other natural resources should be set as the boundary of the LA to minimize coverage overlapping of different cells in two neighboring Lassie there is no mountain or river, the streets or the place with heavy traffic (for example malls) should not be set as the boundary of the LA. Generally, the boundary of the LA should not be parallel or vertical to the streets but beveled to the streets. Generally, in rural-urban fringe zone, the boundary of an LA should be set in the area with least traffic instead of in the area with high traffic to avoid frequent location updates. The value of LAC should not be set too great or too small. It is recommended that the number of TRXs be not more than 300. 2. When changing the LAC, note that the cells cannot have the same CGI. If the LAC is changed on the BSS side, the LAC should be changed on the MSC side accordingly.   6 Feedbacks on High SDCCH Congestion Rate The SDCCH congestion rate can be obtained through the analysis of the traffic statistics. Therefore, if the SDCCH congestion rate on site is too high, send a feedback about the relevant traffic statistics to the headquarters. The information that needs to be sent is shown as follows: 1. The configuration files (.DAT files) of the faulty cell or BSC, and the version number of the BSC software and BTS software; 2. The alarm logs of the faulty cell; 3. The RSL tracing data of the faulty cell; 4. The interference measurement report of the faulty cell (TRX-level); 5. The list of the cells with high SDCCH congestion rate, and the traffic statistics (cell-level) of the faulty cell (including the congestion rate, signaling availability and traffic volume) 2014-06-18 HUAWEI Confidential Page15, Total18
  • 16. GSM BSS Network KPI (SDCCH Congestion Rate) Optimization Manual INTERNAL Appendix Relevant Traffic Counters to BSC6000 SDCCH Congestion Rate BSC-Level Cell-Level TRX-Level SDCCH Seizure Requests per BSC R3300A: Channel Activation Attempts in Immediate Assignment Procedure (SDCCH) R4400A: Attempted Immediate Assignments (SDCCH) Failed SDCCH Seizures due to Busy SDCCH per BSC R3300B: CHAN ACTIV NACK Messages Sent by BTS in Immediate Assignment Procedure (SDCCH) R4400B: Successful Immediate Assignments (SDCCH) Successful SDCCH Seizures per BSC R3300C: Channel Activation Timeouts in Immediate Assignment Procedure (SDCCH) R4430A: Attempted Handovers (SDCCH) Call Drops on SDCCH per BSC R3330A: Channel Activation Attempts in Internal Intra- Cell Handover Procedure (SDCCH) R4430B: Completed Handovers (SDCCH) Traffic Volume on SDCCH per BSC R3330B: CHAN ACTIV NACK Messages Sent by BTS in Internal Intra-Cell Handover Procedure (SDCCH) S4310D: Uplink Quality during Radio Link Failure (SDCCH) Available SDCCHs per BSC R3330C: Channel Activation Timeouts in Internal Intra- Cell Handover Procedure (SDCCH) S4330D: Downlink Quality during Radio Link Failure (SDCCH) Configured SDCCHs per BSC R3340A: Channel Activation Attempts in Incoming Internal Inter-Cell Handover Procedure (SDCCH) S4300D: Uplink Level during Radio Link Failure (SDCCH) Congestion Ratio on SDCCH per BSC R3340B: CHAN ACTIV NACK Messages Sent by BTS in Incoming Internal Inter-Cell Handover Procedure (SDCCH) S4320D: Downlink Level during Radio Link Failure (SDCCH) Call Drop Ratio on SDCCH per BSC R3340C: Channel Activation Timeouts in Incoming Internal Inter-Cell Handover Procedure (SDCCH) S4350D: Radio Link Failures (SDCCH) 2014-06-18 HUAWEI Confidential Page16, Total18
  • 17. GSM BSS Network KPI (SDCCH Congestion Rate) Optimization Manual INTERNAL SDCCH Availability per BSC R3350A: Channel Activation Attempts in Incoming External Inter-Cell Handover Procedure (SDCCH) S4340D: TA during Radio Link Failure (SDCCH)   R3340B: CHAN ACTIV NACK Messages Sent by BTS in Incoming External Inter-Cell Handover Procedure (SDCCH) AS4310D: Mean Uplink Quality during Radio Link Failure (SDCCH)   R3340C: Channel Activation Timeouts in Incoming External Inter-Cell Handover Procedure (SDCCH) AS4330D: Mean Downlink Quality during Radio Link Failure (SDCCH)   A3030A: Call Setup Indications (MOC Non SMS) (SDCCH) AS4300D: Mean Uplink Level during Radio Link Failure (SDCCH)   A3030B: Call Setup Indications (MOC SMS) (SDCCH) AS4320D: Mean Downlink Level during Radio Link Failure (SDCCH)   A3030C: Call Setup Indications (MTC) (SDCCH) AS4200A:Mean Number of SDCCHs in Interference Band 1   A3030D: Call Setup Indications (Emergency Call) (SDCCH) AS4200B: Mean Number of SDCCHs in Interference Band 2   A3030E: Call Setup Indications (Call Re- establishment) (SDCCH) AS4200C: Mean Number of SDCCHs in Interference Band 3   A3030F: Call Setup Indications (Location Updating) (SDCCH) AS4200D: Mean Number of SDCCHs in Interference Band 4   A3030G: Call Setup Indications (IMSI Detach) (SDCCH) AS4200E: Mean Number of SDCCHs in Interference Band 5   A3030H: Call Setup Indications (PS Service) (SDCCH)     A3030I: Call Setup Indications (SS) (SDCCH)   2014-06-18 HUAWEI Confidential Page17, Total18
  • 18. GSM BSS Network KPI (SDCCH Congestion Rate) Optimization Manual INTERNAL   A3030J: Call Setup Indications (LCS) (SDCCH)     A3030K: Call Setup Indications (Others) (SDCCH)     H3500: Outgoing Inter-RAT Inter-Cell Handover Requests (SDCCH) (Excluding Directed Retry)     H3510: Outgoing Inter-RAT Inter-Cell Handover Commands (SDCCH) (Excluding Directed Retry)     H3240: Number of Incoming Internal Inter-Cell Handover Detection Messages Received by BSC (SDCCH)     H3040: Number of Internal Intra-Cell Handover Detection Messages Received by BSC (SDCCH)     H3440: Incoming External Inter-Cell Handover Detection Messages Received by BSC (SDCCH)     H3600: Incoming Inter-RAT Inter-Cell Handover Requests (SDCCH)     H3520: Failed Outgoing Inter-RAT Inter-Cell Handovers (SDCCH) (Excluding Directed Retry)     S3010A: MRs on Signaling Channels (SDCCH) (M900/850 Cell)     S3010B: MRs on Signaling Channels (SDCCH) (M1800/1900 Cell)   2014-06-18 HUAWEI Confidential Page18, Total18