01 network parameter

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01 network parameter

  1. 1. Data Configuration Reference − Network Planning Parameters M900/M1800 Base Station Controller Table of Contents Table of ContentsChapter 1 Foreword....................................................................................................................... 1-1 1.1 Types of Radio Parameter Adjustment.............................................................................. 1-2 1.2 Prerequisites for Radio Parameter Adjustment ................................................................. 1-2 1.3 Points for Attention in Radio Parameter Adjustment ......................................................... 1-3Chapter 2 Data Configuration ...................................................................................................... 2-1 2.1 Local Office ........................................................................................................................ 2-1 2.1.1 BSC Cell Table........................................................................................................ 2-1 2.1.2 Frequency Hopping Data Table .............................................................................. 2-4 2.1.3 Radio Channel Configuration Table ........................................................................ 2-7 2.2 Site..................................................................................................................................... 2-9 2.2.1 Carrier Configuration Table..................................................................................... 2-9 2.2.2 Antenna and Feeder Configuration Table............................................................. 2-10 2.3 Cells ................................................................................................................................. 2-11 2.3.1 System Information Table ..................................................................................... 2-11 2.3.2 Cell Configuration Table........................................................................................ 2-30 2.3.3 Cell Allocation Table ............................................................................................. 2-34 2.3.4 BA1 Table.............................................................................................................. 2-35 2.3.5 BA2 (SACCH) Table ............................................................................................. 2-35 2.3.6 Cell Attribute Table................................................................................................ 2-36 2.3.7 Cell Alarm Threshold Table................................................................................... 2-50 2.3.8 Cell Call Control Table .......................................................................................... 2-52 2.3.9 Cell Call Control Parameter Table ........................................................................ 2-57 2.3.10 Cell Module Information Table ............................................................................ 2-63 2.4 Handover ......................................................................................................................... 2-64 2.4.1 Handover Control Data Table ............................................................................... 2-65 2.4.2 Cell Description Table ........................................................................................... 2-72 2.4.3 External Cell Description Table............................................................................. 2-76 2.4.4 Neighboring Cell Relation Table ........................................................................... 2-76 2.4.5 Filter Data Table.................................................................................................... 2-77 2.4.6 Penalty Table ........................................................................................................ 2-79 2.4.7 Emergency Handover Table ................................................................................. 2-81 2.4.8 Load Handover Data Table ................................................................................... 2-84 2.4.9 Normal Handover Data Table ............................................................................... 2-86 2.4.10 MS Fast Moving HO Data Table ......................................................................... 2-89 2.4.11 Intra-cell Handover Data Table ........................................................................... 2-90 2.4.12 GSM0508 Handover Table ................................................................................. 2-91 2.4.13 Concentric Cell Handover Table ......................................................................... 2-91 Huawei Technologies Proprietary i
  2. 2. Data Configuration Reference − Network Planning Parameters M900/M1800 Base Station Controller Table of Contents 2.5 Power Control ................................................................................................................ 2-100 2.5.1 Power Control Selection Table............................................................................ 2-100 2.5.2 Ordinary Cell PC Table ....................................................................................... 2-101 2.5.3 BTS Power Control Data Table........................................................................... 2-104 2.5.4 MS Power Control Data Table ............................................................................ 2-107 2.5.5 HW II Power Control Data Table......................................................................... 2-110 2.5.6 Table of BTS Power Control Data (AMR) ........................................................... 2-118 2.5.7 Table of MS Power Control Data (AMR)............................................................. 2-121 2.5.8 Table of Power Control Data for Huawei II (AMR) .............................................. 2-124 2.6 Channels........................................................................................................................ 2-132 2.6.1 Radio Channel Management Control Table........................................................ 2-132 2.6.2 HW II Channel Allocation Table .......................................................................... 2-136Chapter 3 BCCH participate in FH Data Configuration.............................................................. 3-1 3.1 Overview ............................................................................................................................ 3-1 3.2 Data Configuration ............................................................................................................. 3-1 Huawei Technologies Proprietary ii
  3. 3. Data Configuration Reference − Network Planning ParametersM900/M1800 Base Station Controller Chapter 1 Foreword Chapter 1 Foreword GSM9001800 BSS Network Planning Parameters ReferenceV3.2 is for Huawei’s GSM BSC 06.1120A version. The difference from the former version is referred to Chapter5. The GSM system can be divided into three parts in physical structure of the network: the network subsystem (NSS), the base station subsystem (BSS), and the MS (MS). In the signaling structure, the GSM system –consists of MAP interface, A-interface (interface between MSC and BSC), Abis interface (interface between BSC and BTS) and Um interface (interface between BTS and MS). All these entities and interfaces have plenty of configuration parameters and performance parameters. Some of them have already been determined during the equipment development stage. Most are determined by the network operators as according to the actual requirements and actual running. The settings and adjustments of those parameters have considerable impacts on the operation of the whole GSM network. Therefore, network optimization is the process of settings and adjustments of various parameters. The GSM network has parameters related to radio devices and radio interfaces that can impact the network performance. The radio parameters in the GSM network refer to those related to radio devices and radio resources. These parameters have vital impact on the coverage, distribution of signaling flow and network performance. Thus, adjustment of radio parameters is an important part of the optimization. The GSM radio parameters can be divided into two types as according to the service targets of the radio parameters, i.e., engineering parameters and resource parameters. The engineering parameters are related to engineering design, installation and commissioning such as antenna height, antenna direction, antenna gain, antenna downtilt and cable attenuation. These parameters must be determined during network design. These parameters can hardly be changed during network operation. The resources parameters refer to those related to the configuration and usage of radio resources. They are normally transmitted on Um interface to keep the consistency between the base station and MS. Most resources parameters can be dynamically adjusted through certain man machine interfaces (MMI) during network operation. The radio parameters involved in this document are mainly radio resources parameters (unless otherwise specify, the parameters described here are radio resources parameters). When an operator is to construct a mobile communications network, he must first make engineering design according to geographic environments, service forecast, radio channel features, and etc. The design should include network structure design, Huawei Technologies Proprietary 1-1
  4. 4. Data Configuration Reference − Network Planning ParametersM900/M1800 Base Station Controller Chapter 1 Foreword base station location selection and frequency planning. During the network operation, the operator may need to adjust the network configurations and parameters so as to improve network performance. This is an important part of the whole network optimization process. Radio parameter optimization is a process to improve the communication quality, the network performance, and the equipment utilization rate by adjusting the partial or global radio parameters as according to the actual radio channel features, traffic features, and signaling flow bearing. The basic principle of radio parameter adjustment is to make full use of existing radio resources, balance the global traffic and signaling flow through load-sharing so as to achieve a better network performance.1.1 Types of Radio Parameter Adjustment There are two types of radio parameter adjustment. The first type of Radio Parameter Adjustment is to solve static problems as according to the actual average traffic and signaling flow. The other type of Radio Parameter Adjustment is to solve problems in traffic overloading and channel congestion. For the first type of adjustment, the operator has to test the actual running of the network periodically. On the basis of the test results adjust the global or partial network parameters and configurations. While for the second type of adjustment, the operator needs to adjust some radio parameters – as according to the real-time driver test and the traffic statistics data. This document describes the meaning of the parameters and analyses the impact of parameter adjustment on the whole network performance.1.2 Prerequisites for Radio Parameter Adjustment The network operator must know the meaning, adjustment method and the result of the adjustments of each radio network parameter. The network operator should be very experienced in the radio network parameters. This is a necessary condition to adjust radio network parameters effectively. Meanwhile, the adjustment of radio parameters depends on many testing data during network operation. Generally, these data can be obtained in two ways. Firstly, the statistical data can be obtained from the Operation Maintenance Center (OMC) such as the load of CCCH, RACH channels. Secondly, other data such as the coverage, and the MS speech quality, should be obtained from actual measurements and tests. Therefore, frequent and long-term measurements of various network features are necessary for effective radio parameter adjustment. Huawei Technologies Proprietary 1-2
  5. 5. Data Configuration Reference − Network Planning ParametersM900/M1800 Base Station Controller Chapter 1 Foreword1.3 Points for Attention in Radio Parameter Adjustment In the GSM system, many radio network parameters are set on the basis of cells and local areas (LA). As inter-region parameters are often strongly interrelated, during adjustment of those parameters, consideration must be given to the impact on other areas, especially on neighboring cells. Otherwise, parameter adjustment will bring about negative consequences. Besides, when a problem occurs in a region, make sure whether it is caused by equipment faults (including connection failure). Only when it is confirmed that network problems are caused by service causes then radio parameter adjustment is performed. The radio parameter adjustments recommended in this document assume that no device problems exist. Huawei Technologies Proprietary 1-3
  6. 6. Data Configuration Reference − Network Planning ParametersM900/M1800 Base Station Controller Chapter 2 Data Configuration Chapter 2 Data Configuration2.1 Local Office2.1.1 BSC Cell Table Cell system type Range: GSM900, GSM1800, GSM900/GSM1800, PCS1900, GSM850 Unit - Default: GSM900 Description: M900/M1800 BSC supports both the independent and hybrid network structures of both 900M and 1800M. The frequency band can be set as "GSM900". Or "GSM1800", or GSM900/GSM1800 as according to the actual situation. Huawei M900/M1800 BSC supports the networking of PCS1900M, GSM850M, the hybrid networking of GSM900 and PCS1900, and the hybrid networking of GSM850 and GSM900/GSM1800. It does not support the hybrid networking of 1900M and 1800M.. Hybrid cell possesses the following features in respect of data configuration: 1, Hybrid cell supports both M900 and M1800. 2, Hybrid cell must also be concentric cell. 3, Primary BCCH channel, combined BCCH channel / BCCH + CBCH channel and BCH channel configured on different TRXs must be in OverLaid subcell. TRXs in the same frequency band with the TRX that the BCCH is configured on are also in OverLaid subcell, and the other TRXs are in UnderLaid subcell. 4, SDCCH and some data service relative channel (dynamic PDCH and static PDCH) must be configured on TRXs in OverLaid subcell. 5, A cell can not be configured as hybrid cell if it is configured as 2-timeslots extension cell and vice versa. But no such restriction is presented for other normal cells or single-timeslot extension cell. 6, In hybrid cell, M900 and M1800 can not be in the same frequency hopping group simultaneously. Sub cell type Huawei Technologies Proprietary 2-1
  7. 7. Data Configuration Reference − Network Planning ParametersM900/M1800 Base Station Controller Chapter 2 Data Configuration Range: Normal, upper layer and lower layer. Unit - Default: "normal" Description: Use to determine a cell class in a hierarchical structure so as to differentiate macro-cell, micro-cell, and to realize load-sharing and inter-layer handover. cell class Range: Medium layer, upper layer, and lower layer. Unit - Default: "upper layer" Description: Use to determine a cell class in a hierarchical structure so as to differentiate macro-cell, micro-cell, and to realize load-sharing and inter-layer handover. BCC Range: 0–7 Unit - Default: - Description: BCC is Base Station Color Code. It is used to distinguish among neighboring cells with the same BCCH frequency. In cells that use frequency hopping, the TSC in the frequency hopping data table must be configured to be consistent with the BCC in the cell. Regarding the protection against co-channel interference, the MS reports the BCC value so that the BSC can distinguish among different cells transmitting on the same frequency. For this purpose the BCC must be allocated as wisely as possible. If frequency reuse clusters are used then it is recommended that all BTSs in a given cluster use the same BCC. In this way the reuse distance of a certain BCC can be maximized according to the frequency reuse distance. Note that only 8 different values (BCC: 0 to 7) are used for the purpose of recognizing co-channel interference. Note: 1. After modify the BCC of the cell, you shall modify the TSC in the frequency hopping table correspondingly. 2. Known by the transmit end and the receive end, the TSC is used to locate the position of other bits in the same bust and judge whether the received signals of the same frequencies are valid. The burst that is no consistent with the known TSC cannot be decoded. 3. According to the GSM protocols, the TSC must be the same with the BCC regarding the broadcast and common control channels. For the TCH channel, the BCC is not required to be the same with the TSC. But many manufacturers sets the BCC and the TSC same Huawei Technologies Proprietary 2-2
  8. 8. Data Configuration Reference − Network Planning ParametersM900/M1800 Base Station Controller Chapter 2 Data Configuration by force (including for TCH channel). Therefore, it is recommended to set BCC=TSC in actual data configuration. 4. Common BCCH frequency and common BSIC causes the following problems: 1) In the RACH, the NCC and BCC of the target cell are used to read the meaning of the access information. If there are common frequencies and common BSICs, th random access information (including handover access) may be processed in the non-serving cell in case of over-cell coverage. This leads to the SDCCH allocated abnormally or congested. 2) Common BCCH frequencies and common BSICs may also cause the error handover judgment. Although two cells are not defined as neighbors, if they have the common BCCH frequency and common BSIC, MS may handover to the cell due to its strong signals. 3) When the TCH co-channel interference or the frequency hopping co-channel interference occurs, the TSC (same with BCC) in the TCH is an important criterion to judge the useful voice frame and useless voice frame. Therefore, reasonable BCC planning can reduce the interference’s effect on voice. 5. The BCC planning priciples: keep the common BCCs far away from each other. Keep the common BCCH frequencies and common BSICs far away from each other The specific requirements are as follows: 1) In the frequency planning, especially the 1X1 and 1X3 fruqency hopping nework planning, the probability o the TCH frequency interference is high. Therefore, when plan the BCC, set eight bas station as a cluster and one base station uses one BCC. 2) Any frequency planning shall meet the principles of keeping common BCCH frequencies and common BSICs far away from each other. When the BCCH frequencies are the same, try to set the BSICs different. If conflict with the BCC planning principles, try to modify the NCC to avoid the common frequency and common BSIC when NCC can be modified. NCC Range: 0–7 Unit - Default: - Description: The NCC is Network Color Code. It is used to discriminate networks in different areas. It is a uniform code over the whole country. The color code NCC is then used to discriminate cells that use the same frequency. Though mainly intended for the purpose of differentiating PLMNs, it also serves to distinguish cells within one PLMN that use the same frequency provided they have been Huawei Technologies Proprietary 2-3
  9. 9. Data Configuration Reference − Network Planning ParametersM900/M1800 Base Station Controller Chapter 2 Data Configuration assigned different NCC. What is stated here should be considered as general guidelines. Of course any type of NCC assignment must be decided by agreements between operators and countries. CGI Range: MCC: 3 digits (Mobile Country Code). MNC: 2 or 3 digits (Mobile Network Code). LAC: 1 to 65535 (Location Area Code). CI: 0 to 65535 (Cell Identity). Unit - Default: - Description: Cell global identifier. CGI = MCC + MNC + LAC + CI. It should be noted that the classification of LAC has a significant effect on increasing signaling load and call completion rate. Note: In Huawei system, LAC and CI should be in hexadecimal format. CGI is sent to the mobile station (MS) as a part of the system information message (GSM Rec. 04.08). The combination MCC-MNC-LAC is also known as the location area identity (LAI). Support GPRS Description: Indicating whether the GPRS function is supported. It should be noted that the GPRS function needs the support of the base station. Range: Yes, No Unit Default: No Note: For base station versions that dont support the GPRS function and cells that do not provide the GPRS service, the value must be set to No. Otherwise, some mobiles cannot access to the network.2.1.2 Frequency Hopping Data Table Huawei’s GSM supports RF frame/baseband frame/timeslot hopping. The list is as follows: Huawei Technologies Proprietary 2-4
  10. 10. Data Configuration Reference − Network Planning ParametersM900/M1800 Base Station Controller Chapter 2 Data Configuration BCCH RF Baseband Timeslot Frame participating BTS series hopping hopping hopping hopping in baseband hopping BTS2X Y N N Y N BTS3X Y Y Y Y Y BTS22C Y N N Y N BTS3001C N N N N N (1TRX) BTS3001C Y N N Y N (2TRX) BTS3002C Y N Y Y N FH index No. Range: 0–65535 Unit - Default: - Description: Internal index number providing an association between the radio channel configuration table and the frequency hopping data table. Note: For data configuration when BCCH joins in baseband timeslot frequency hopping, please refer to the matching materials (Data configuration when BCCH is involved in frequency hopping). MA Range: -0−1023 Unit - Default: - Description: The MA is a set consisting of a maximum of 64 hopping frequencies. These frequencies must be those in the cell allocation table. Note: MA is a set consisting of a maximum of 64 hopping frequencies. These frequencies must be those in the cell allocation table. MA of RF hopping cannot include the frequency of BCCH. But if BCCH participates in frequency hopping (baseband/timeslot FH), MA in other timeslots can include the BCCH frequency except the timeslot 0 of hopping TRX (when extended BCCH is configured, its’ corresponding timeslot should be excluded) Frequency hopping algorithm: If it is FH, calculate the frequency to be used by invoking FH algorithm as per hopping frequency set (Radio channel Huawei Technologies Proprietary 2-5
  11. 11. Data Configuration Reference − Network Planning ParametersM900/M1800 Base Station Controller Chapter 2 Data Configuration configuration table and Frequency hopping data table) in the channel property settings. Judge whether it is baseband frequency hopping. If it is baseband frequency hopping, find out the TRX NO to be used for the frequency calculated just now as per the correspondence between FH frequency and TRX NO (TRX configuration table). So, the correspondence between hopping frequency and TRX NO in TRX configuration table is only used in base band frequency hopping. While the correspondence between hopping frequency and TRX NO. is not suitable for RF hopping. When use cyclic frequency hopping and DTX at the same time, the frequency number N cannot be the multiple of 13. Otherwise, most of the SACCH frames are sent and measured in the same frequency. This affects the accuracy of the measurement report carried by the SACCH frame in the active mode. HSN Range: 0–63, (HSN = 0 cyclic hopping sequence, HSN = 1 to 63 pseudo random) sequences. HSN should be the same for all the channels in one cell. MS can not access if HSN is greater than 63. Unit - Default: - Description: Hopping sequence number, it should be consistent with the 64 types of FH sequence. TSC Range: 0–7. Unit - Default: - Description: Training sequence code. In cells that use FH, TSC must be set to be the same as the BCC in the cell. Otherwise, the TCH channels cannot be properly occupied. Huawei Technologies Proprietary 2-6
  12. 12. Data Configuration Reference − Network Planning ParametersM900/M1800 Base Station Controller Chapter 2 Data Configuration Note: For base band FH, the parameter “TRX Aiding Function Control” in the [cell configuration table] must be set to “Allowed & Recover When Check Res.” In the G3BSC32.10100.06.1120A and later version. If there is faulty TRX in FH group and the base band FH must be opened, the faulty TRXs must be removed from the FH group. When cycling FH and DTX are used together, the number of frequencies cannot be a multiple of the 13. Otherwise, most SACCH frame will be sent and measured on the same frequency, which affects the accuracy of the measurement reports contained in the SACCH.2.1.3 Radio Channel Configuration Table MAIO Range: 0–N-1, N is the number of frequency in MA. Unit - Default: - Description: Mobile Allocation Index Offset. In frame that uses FH, the same MAIO is recommended for all channels of a TRX and different MAIO for different TRX in the same cell. The primary policy is to guarantee that the MAIO of the same timeslot of different TRX that use the same HSN and MA in synchronized cells are not the same. This is to avoid the co-frequency collision. In timeslots that use FH, the MAIO of various channels of the same TRX can be configured differently. CH type Range: TCH full rate, TCH half rate 01, TCH half rate 0, SDCCH8, Main BCCH, Combined BCCH, BCH, BCCH+CBCH, SDCCH+CBCH, PBCCH+PDTCH, PCCCH+PDTCH, PDTCH, Dynamic PDTCH Unit - Default: When configure more than one SDCCH, divide the SDCCHs equally. The main BCCH TRX can’t configure more than 2 SDCCH. A TCH TRX can configure 2 SDCCH at most, and if in 16K mode and MR. Pre-process was disabled, one SDCCH can be configured at most. In the place where has much paging, think to not configure SDCCH on main BCCH TRX. Description: Indicating the channel type and the function of each timeslot of all carriers in a cell. Every cell is configured with a BCCH carrier. Generally, the TRX ID of BCCH is fixed to be the smallest TRX ID in the cell. The ordinary channel combinations of BCCH carrier are Huawei Technologies Proprietary 2-7
  13. 13. Data Configuration Reference − Network Planning ParametersM900/M1800 Base Station Controller Chapter 2 Data Configuration as follows: Combinations: BCCH+7TCH Main BCCH+SDCCH/8+6TCH Main BCCH+2SDCCH/8+5TCH Main BCCH+SDCCH/8+ extended BCCH(BCH)+5TCH Main BCCH+SDCCH/8+ extended BCCH(BCH)+TCH+ extended BCCH(BCH)+3TCH Note: 1) The configuration of BCCH in a cell should be done appropriately according to the channel number of the cell and the paging capability in a LAC. 2) The main BCCH and combined BCCH are configured in timeslot 0, and extended BCCH channel can be configured only in timeslots 2, 4, and 6. After extended BCCH channels are configured, the CCCH configuration parameters in the system information table should be configured accordingly. For example, if an extended BCCH is configured in timeslot 3) then in the system information table, CCCH should be configured into 2 non-combined CCCHs. 3) If the cell broadcast function is available, SDCCH+CBCH instead of SDCCH8 can be configured, or SDCCH+CBCH instead of a TCH can be configured. If the CBCH of SDCCH/4 is adopted, their channel type can be configured to be BCCH+CBCH. 4) For 1 to 2 TRX, one SDCCH/8 is configured; for 3 to 4 TRX, 2 SDCCH/8 s are configured; for 5 to 6 TRX, 3 SDCCH/8 s are configured. Meanwhile, the dynamic SDCCH allocation function should be enabled and work properly. Half-rate networking possesses the following features different from other networking modes. 1, Half-rate mode, a channel configured as half-rate TCH includes two half-rate sub-channels and must occupy two trunk circuits. A channel configured as full-rate TCH includes only one full-rate channel and occupies one trunk circuit, but it must also be configured with two trunk circuits in order that the full-rate TCH can be converted dynamically into half-rate TCH. Before the adjustment, the latter trunk circuit is idle, and after the adjustment, both the trunk circuits are allocated to the two half-rate sub-channels. For other channels requiring trunk, they must also be configured with two trunk circuits, otherwise, all affected channels must be modified after channel type is modified dynamically. 2, In half-rate mode, multiplexing ratio of Abis interface LAPD signaling link can be up to 2:1 as RSL signaling flow of each TRX increases. 3, In half-rate mode, an E1 can support a maximum of 13 TRXs (less than 13 TRXs if LAPD signaling link does not support multiplexing.) 4, In half-rate mode, each BIE can support a maximum of 17 TRXs Huawei Technologies Proprietary 2-8
  14. 14. Data Configuration Reference − Network Planning ParametersM900/M1800 Base Station Controller Chapter 2 Data Configuration (less than 17 TRXs if LAPD signaling link does not support multiplexing.) 5, In half-rate mode, if BTS supports BIE crossover connection, the BIEs crossed over must be in half-rate networking mode. 6, In half-rate mode, 256 HW timeslots of the BS1 interface are numbered sequentially. Service channels are allocated in the order of from the timeslot 0 to the timeslot 255. While OML and RSL are allocated in the order of from the timeslot 255 to the timeslot 0. 7, For a BIE group configured as half-rate networking mode, all BTS data must be modified based on this rule. 8, In half-rate data configuration, 34BIE and 13FTC (HR version)/14FTC must be used. Otherwise, either 32BIE or 34BIE can be used as BIE, and either 12FTC or 13FTC can be used as FTC.2.2 Site2.2.1 Carrier Configuration Table Static TRX Power class Range: 0–13 BTS versions: BTS3X support the static power setting of levels 0–10. BTS2X support the static power setting of levels 0–10. BTS22C support the static power setting of levels 0–13. BTS3001C support the static power setting of levels 0–13. BTS3002C support the static power setting of levels 0–10. Unit - Default: 0 Description: Power class "0" shows that power is in its maximum. Each class is 2 dB less than its former class. Note: Cells can be enabled to sufficiently carry traffic by setting the "power class" parameter. If antennas are so high that they result in serious cross-cell overlapping, the primary solution is to lower the antenna height and increase the antenna downtilt. Reducing the BTS power output will deteriorate indoor coverage. The ARFCNs must be the subset of the CA. Generally, for cells with the same priority in the network, their power class setting should guarantee that the EIRP of every cell is Huawei Technologies Proprietary 2-9
  15. 15. Data Configuration Reference − Network Planning ParametersM900/M1800 Base Station Controller Chapter 2 Data Configuration basically the same. During power class setting, it should be noted that different combining modes might result in the different power losses. If FH is not enabled, only the first one among all ARFCNs in the carrier configuration table is valid. BSC06.1120 and later version can support EGSM/RGM band. Carrier power type Range: 40 W, 60 W,Default Unit - Default: Default Description: Used to configure the carrier type, which is used to distinguish carriers with different powers. HW-IUO property Description: Indicating whether TRX should be configured as OverLaid or UnderLaid subcell. Range: OverLaid subcell, UnderLaid subcell, None Unit - Default: - Note: In the cell with single TRX but dual timeslot, the HW-IUO property of the TRX shall be configured as OverLaid. TRX priority Description: The priority of TRX (valid in HW_II channel allocation algorithm only.). Range: Level 0–Level 7 Unit - Default: Level 02.2.2 Antenna and Feeder Configuration Table Tower-mounted amplifier flag Range: With tower-mounted amplifier, Without tower-mounted amplifier Unit - Huawei Technologies Proprietary 2-10
  16. 16. Data Configuration Reference − Network Planning ParametersM900/M1800 Base Station Controller Chapter 2 Data Configuration Default: - Description: Weather to use Tower-mounted amplifier. Power attenuation factor Range: 0–255 Unit - Default: The configuration depends on the feeder cable length. Configuration methods are as follows: The BTS2.x adopts non-CDU mode; this parameter is fixed as 10. In the case that BTS (including 2.0 and 3.0 base stations) adopts CDU, CDU gain should be adjusted according to the two parameters described above. Uplink: according to whether the tower-mounted amplifier is used: Description: Use to compensate the amplifier’s gain. Tower-mounted Power attenuation factor Description amplifier flag Triplex tower amplifier gain: 12. Duplex tower amplifier gain: Tower-mounted amplifier 14 With tower-mounted gain –feeder cable loss = 12 amplifier Simplex tower amplifier gain: – 4 = 8 dB 14 Assuming that feeder loss: 4dB Without tower-mounted 0 amplifier Downlink: Without tower-mounted amplifier, power attenuation factor is set to be 255.2.3 Cells2.3.1 System Information Table System information Range: 1–12. 2bis, 2ter, 5bis, 5ter, 10bis Huawei Technologies Proprietary 2-11
  17. 17. Data Configuration Reference − Network Planning ParametersM900/M1800 Base Station Controller Chapter 2 Data Configuration Unit - Default: 1–6. 2bis, 2ter, 5bis, 5ter Description: Use to determine whether to use a certain type of system information. The system information is broadcasted from BTS to MS. The system information informs all MS of the cell the information about LAC, CGI, CA, available HSN, channel allocation and random access control. This helps MS to locate network resources quickly and accurately. 2bis and 5bis are used for the 1800 network, and 2ter and 5ter are used for the 900/1800 dual-band network. For detailed system information definitions, please refer to Protocol 0408 and system information training materials. Regular transmission Range: Yes, No Unit - Default: Yes Description: Indicating whether BSC regularly updates the system information sent by BTS. If it is set as "Yes", BSC updates the system information being sent by BTS every interval (the interval is determined by regular transmission interval). Regular transmission interval Range: 0–255 Unit - Default: 10 Description: The interval for BSC to retransmit system information to BTS. MS MAX retrans Range: 1, 2, 4, 7 Unit times Default: - Description: The maximum times for MS being allowed to send the "Channel Request" message during one immediate assignment process. After the immediate assignment process starts, MS will keep monitoring BCCH and CCCH information. If the MS does not receive an Immediate Assignment or Immediate Assignment Extend command, MS will keep retransmit ting the channel request message at every certain interval. The greater is this parameter, the higher the call attempt success rate, the higher call completion rate and the greater the load on RACH and SDCCH. See Protocol 0408. Huawei Technologies Proprietary 2-12
  18. 18. Data Configuration Reference − Network Planning ParametersM900/M1800 Base Station Controller Chapter 2 Data Configuration Note: 1) The bad downlink quality might cause an MS to send SABM message to BTS multiple times. 2) For areas where the cell radius is more than 3 kilometers and there is a less traffic (normally the suburb or rural areas), M can be set as 11 (i.e., the maximum retransmission times is 3) so as to raise MS access success rate 3) For areas where the cell radius is less than 3 kilometers and there is an average traffic (generally, it refers to the less busy urban areas), M can be set as 10 (i.e., the maximum retransmission times is 4) For microcell areas and obviously congested cells with a large traffic, M is recommended to be set as 00 (i.e., the maximum retransmission times is 1). 5) For satellite transmission BTS, M is recommended to set to be equal to or greater than 4. Common access control class Range: Level 0–9 forbidden Unit - Default: 000000000 Description: Use to control load and to permit or forbid the network access of users at certain common access levels. Defines which access classes that are barred. Up to 16 access classes can be defined. Class 10 defines emergency call in the cell. 0 to 9 Access classes that are barred. 10 Emergency call not allowed for MSs belonging to classes 0 to 9. It may be of interest to the operator to bar the access to the system to a certain type of MS. For this purpose it is possible to define up to 16 different access classes of MSs and then select the classes that can not access a cell by means of ACC (GSM 04.08, section 10.5.2.17). The classes are defined according to GSM 02.11. Classes 0 to 9 are reserved for the operator to be used for normal subscribers (home and visiting subscribers). Special access control class Range: Level 11–15 forbidden Unit - Default: 00000 Huawei Technologies Proprietary 2-13
  19. 19. Data Configuration Reference − Network Planning ParametersM900/M1800 Base Station Controller Chapter 2 Data Configuration Description: Use to control load and to permit or forbid the network access of users at certain special access levels. Classes 11 to 15 are defined as follows: 11 PLMN use. 12 Security Services. 13 Public utilities. 14 Emergency services. 15 PLMN staff. Cell channel description format Range: Bitmap, 1024, 512, 256, 128, Variable-length Unit - Default: Bitmap Description: The message element is a list of available absolute carrier numbers in a serving cell. Its length is 17 bytes. To be specific, from the D3 bit of the second byte in the cell channel description to the D0 bit in the 17th byte, there are totally 124 bits, recorded respectively as carriers No. 124, 123, 122.3, 2, and 1. If the Nth bit is 1, then this Nth carrier belongs to this cell. ATT Range: Yes, No Unit - Default: Yes Description: Attach-detach allowed. ATT tells the MS if it is allowed to apply IMSI attach and detach, i.e. if the MS is allowed to send a message to the system every time it is turned on or off (GSM 04.08, section 10.5.2.11). For different cells in the same LAC, their ATTs must be set to be the same. PWRC Range: Yes, No Unit - Default: Yes Description: If BCCH carrier timeslots participate in frequency hopping, PWRC indicate whether MS should remove the receiving level from BCCH carrier timeslots when it calculates the average receiving level Both MS and BTS must possess measurement function so as to monitor RL communication quality and perform power control. But Huawei Technologies Proprietary 2-14
  20. 20. Data Configuration Reference − Network Planning ParametersM900/M1800 Base Station Controller Chapter 2 Data Configuration the measurement may result in some problems when several independent GSM functions works together. First, it is allowed by GSM recommendations that hopping channel uses the BCCH frequency (but not in the timeslot transmitting BCCH). Second, downlink power control is allowed in the frequency hopping channel. Third, power of the TRX involving BCCH can not change since MS must measure the signal level of the neighboring cell. Therefore, downlink power control is feasible only for a frequency sub-set of this channel. That is, it excludes BCCH TRX used in frequency hopping by this channel. If MS measures the average downlink channel level in the common way, the measurement result is incorrect for power control. So MS should remove the receiving level from BCCH carrier timeslots when it calculates the average receiving level during frequency hopping. UL DTX Range: Allowed, Mandatory, Forbidden Unit - Default: Mandatory Description: Uplink DTX, Indicates whether the discontinuous uplink transmission of MS is enabled in the last measuring period. See Protocol 0508. Note: Huawei GSM supports whether to enable the downlink DTX function in BSC. For parameter setting, please refer to "Whether to use downlink DTX" in the cell attribute table. CBA Range: Yes (1), No (0) Unit - Default: Yes Description: Cell Bar Access. See Protocol 0408. It can be used together with CBQ to determine the priority of cells. It is possible to use CBA to bar a cell (GSM 03.22 and 05.08). When a cell is barred it is ignored by MSs in idle mode but an active MS can perform handover to it. Note: Host provides a reverse calculation. If OMC is configured as yes (1), CBA transmitted to MS is still yes (0), which complies with the protocol. ”yes” and no” are used In data configuration (either data configuration system or auto configuration system). “0” and “1” are only set in the program. CBQ Huawei Technologies Proprietary 2-15
  21. 21. Data Configuration Reference − Network Planning ParametersM900/M1800 Base Station Controller Chapter 2 Data Configuration Range: Yes (1), No (0) Unit - Default: No Description: Cell Bar Qualify. See Protocol 0408. It can be used together with CBA to determine the priority of cells. For GSM phase 2 MSs, a cell can be given two levels of priority. This is controlled by the parameter CBQ in conjunction with CBA, as shown in below table. The interpretation of CBA and CBQ varies depending on whether the MS is a phase 1 MS or a phase 2 MS. For phase 2 MSs the behavior is also different in cell selection compared to cell reselection. In idle mode the MS looks for suitable cells to camp on by checking cells in descending order of received signal strength. If a suitable cell is found, the MS camps on it. At cell selection With a phase 2 MS, cells can have two levels of priority, suitable cells which are of low priority are only camped on if there are no other suitable cells of normal priority (GSM 03.22). Cell selection CBQ CBA Cell reselect priority priority No(0) Yes(1) Normal Normal No(0) No(0) Barred Barred Yes(1) Yes(1) Low Normal Yes(1) No(0) Low Normal Note: The value of CBA and CBQ can affect the MS access to the system. The above table is for Phase2 MS EC allowed Range: Yes, No Unit - Default: Yes Description: Emergency call allowed. For the MS at access level 0–9, the "Yes" of this parameter indicates that emergency call is allowed; for MS at access level 11–15, only when both the corresponding access control class and this parameter are set to “Yes” then emergency call be forbidden. Call re-establishment allowed Huawei Technologies Proprietary 2-16
  22. 22. Data Configuration Reference − Network Planning ParametersM900/M1800 Base Station Controller Chapter 2 Data Configuration Range: Yes, No Unit - Default: Yes Description: Whether to allow call re-establishment. For the radio link disconnection caused by unexpected interference or coverage of "blind spot", MS can start the call re-establishment process to recover the conversation. The call re-establishment takes long time, the subscriber usually cannot wait and hang up the call. Therefore, It is recommended not to allow the call re-establishment. NCC permitted Range: 0 allowed–7 allowed Unit - Default: 1111111 Description: Network color code permitted. The value 1 stands for permitted and 0 for forbidden. This parameter is sent in system information 2 and 6. When the cell’s NCC is consistent with the value of NCC permitted, then this cell will be measured by MS. And MS will report the measurement report to BTS. This parameter consists of one byte (8bit). Each bit is corresponding to an NCC (0–7) and the last bit is corresponding to NCC 0. If bit N is 0, then MS will not measure the cell level with NCC being N. Note: As MS cannot report the neighboring cell information where NCC is set to 0, the incorrect setting of this parameter will cause MS to be unable to hand over during conversation. See Protocol 0508. This parameter can be used to make MS‘s measurements on some neighboring cells optionally. CCCH-CONF Range: 1 combined CCCH, 1 non-combined CCCH, 2 non-combined CCCHs, 3 non-combined CCCHs, and 4 non-combined CCCHs. Unit - Default: non-combined CCCH Description: CCCH configuration. Note: 1) Non-combined CCCH, 1 combined CCCH, 2 non-combined CCCHs, 3 non-combined CCCHs, and 4 non-combined CCCHs. In a corresponding BCCH multi frame, numbers of CCCH message blocks are: 9, 3, 18, 27, and 36. CCCH configuration determines the capacity of PCH, AGCH, and RACH. Generally, the PCH capacity of every cell in a LAC should be consistent. 2) For the cell with one carrier, it is recommended to configure 1 combined CCCH. For the cells of other configurations, determine the CCCH configuration as according to the carrier number. For Huawei Technologies Proprietary 2-17
  23. 23. Data Configuration Reference − Network Planning ParametersM900/M1800 Base Station Controller Chapter 2 Data Configuration extended BCCH (including the main B and expanded BCCH), the number of BCCH channels configured is equivalent to the number of non-combined CCCHs configured. 1, BS_AG_BLKS_RES and CCCH configuration parameters will be adjusted dynamically as per main BCCH channel 0 configuration types. 2, If CCCH is not configured as “1 combined CCCH”, the Access granted blocks reserved change into 2 by default, and the value of the parameter ranges from 1 to 7. If CCCH is configured as “1 combined CCCH”, the Access granted blocks reserved in the corresponding system message change into 1 by default, and the value of the parameter ranges from 1 to 2. 3, If main BCCH channel 0 is configured as “combined BCCH" or “BCCH + CBCH”, the corresponding CCCH parameter in the system message list is configured as “1 combined CCCH”. 4, If main BCCH channel 0 is configured as “main BCCH", the corresponding CCCH parameter in the system message list is configured as “N non- combined CCCH”. N is the total number of channel 0, 2, 4, 6 that are configuration as “main BCCH” and “BCH”. Tx-integer Range: 3–12, 14, 16, 20, 25, 32, 50 Unit RACH timeslot (equals to a TDMA frame, 4.615ms) Default: 20 Description: Use to determine the timeslot number of the interval between two continuous requests when MS continuously sends multiple channel requests. The purpose of this parameter is to reduce the number of collisions on RACH which mainly affects the execution efficiency of immediate assignment process. Tx-integer and the CCCH configuration jointly determine the parameter S, as shown in the following table. S Tx-integer non combined CCCH combined CCCH / SDCCH 3. 8. 14. 50 55 41 4. 9. 16 76 52 5. 10. 20 109 58 6. 11. 25 163 86 7. 12. 32 217 115 Huawei Technologies Proprietary 2-18
  24. 24. Data Configuration Reference − Network Planning ParametersM900/M1800 Base Station Controller Chapter 2 Data Configuration Description: The timeslot number that MS used for sending the first channel request message is a random value in the set of {0, 1… MAX (T, 8)-1}. The timeslot number for the interval between any two adjacent channel request messages (excluding the timeslots sending the message) is a random value in the set of {S, S+1… S+T-1}. The greater the Tx-integer, the greater the range for the interval of MS to send channel request messages, and the lesser the RACH collisions. The greater the S value, the greater the interval for MS to continuously send channel request messages, and the lesser the chance of collisions on the RACH channel, and the higher the availability rate of AGCH and SDCCH channels. But the increase of T and S will increase MS access duration, which leads to drop in the access performance of the whole network. Generally, it should be guaranteed that that no overloading occurs on the AGCH and SDCCH channels and the S should be as small as possible. Example If the cell has a non combined CCCH and TX = 7 then the interval between each retransmission may be 1 second (217 RACH slots), 1 sec. + 4.615 ms, 1 sec. + 2*4.615 ms, … 1 sec. + 6*4.615 ms. Note: In case of large traffic, the smaller the S+T value the lower the immediate assignment success rate. In this case, we can adjust the T value so that S+T is greater. In the case of satellite transmission, this value should be 32 so as to reduce impact of satellite transmission delay. BS_AG_BLKS_RES Range: 0–7 (non-combined BCCH), 0–2 (1 combined CCCH), Unit Block Default: 2 (non-combined CCCH), 1 (combined CCCH) Description: Number of CCCH blocks reserved for the access grant channel. The remaining CCCH blocks are used for the paging channel. In each downlink non-combined SDCCH 51 frames multi-frame there are 9 different CCCH blocks and in the combined BCCH/SDCCH there are 3 different blocks. They can be used to: Send paging messages, i.e. used as a Paging Channel. Send access granted messages, i.e. used as an Access Grant Channel. Huawei Technologies Proprietary 2-19
  25. 25. Data Configuration Reference − Network Planning ParametersM900/M1800 Base Station Controller Chapter 2 Data Configuration After an MS tunes to the BCCH/CCCH channel and decodes the System Information, it performs an evaluation that, taking into account the MSs own IMSI (International Mobile Station Identity) number, determines to which particular CCCH block in the physical channel it should listen (GSM 05.02). Every CCCH in the physical channel (Paging Sub-channel) sends paging messages to a certain group of MSs that are called its paging group. The reason for the existence of such paging groups is that the MSs can save batteries because it only needs to listen to its own Paging Subchannel messages. The physical channel (Paging Subchannel) sends paging messages to a certain group of MSs. As mentioned before these very same CCCH blocks are also used to send Access Grant messages to the MSs, i.e. to answer a Random Access message that an MS wanting to access the system has sent to the system. The structure of the CCCH regarding Paging messages and Access Grant messages can be controlled by the two parameters: BS_AG_BLKS_RES and BS-PA-MFRAMS, and the setting of this parameter will impact on the MS paging response time and the system service performance. Note: It is specified in the protocol that the reserved AGCH blocks can not be 0 in the following cases: 1) There is system message to be transmitted on Extended BCH. 2) There has been configured with CBCH channel. 3) There has been configured with NCH channel in the case of GSMR. BS-PA-MFRAMS Range: 2–9 Unit CCCH multi-frames Default: For the area with ordinary or heavy load on paging sub-channel (the area with medium or high traffic volume in the location area), set MFR to 6 or 7 (make 6 or 7 multi-frames as a paging group). For the area with low load on paging sub-channel (the area with low traffic volume in the location area), set MFR to 4 or 5 (make 4 or 5 multi-frames as a paging group). Usually, set MFR to 2. Description: Paging Multi-frames period. Defines period of transmission for PAGING REQUEST messages to the same paging subgroup. Together with BS_AG_BLKS_RES, BS-PA-MFRAMS determines the number of paging groups. MFRMS is also used by the MS to determine downlink signaling failure in idle mode (GSM 05.08). The downlink signaling failure criterion is based on the downlink signaling failure counter DSC. When the MS camps on a cell, DSC shall be initialized to a value equal to the nearest integer to 90/N, where N is the BS-PA-MFRAMS parameter for that cell. Thereafter, whenever the Huawei Technologies Proprietary 2-20
  26. 26. Data Configuration Reference − Network Planning ParametersM900/M1800 Base Station Controller Chapter 2 Data Configuration MS attempts to decode a message in its paging subchannel; if a message is successfully decoded DSC is increased by 1, (however never beyond the nearest integer to 90/N), otherwise DSC is decreased by 4. When DSC reaches 0, a downlink signaling failure shall be declared. A downlink signaling failure shall result in cell reselection. Note: 1) A paging block (four continuous CCCH timeslots) can bear 2 IMSI paging or 4 TMSI paging or an AGCH immediate assignment message. 2) The DL signaling channel is faulty in idle mode. The DL fault principle is based on the DL signaling fault counter DSC. While the MS remains in a cell, DSC is initiated to the nearest number of 90/NodeB where N is BS_PA_MFRMS (the number of frames with same paging) with the range of 2~9. So, DSC is incremented by 1 when the MS successfully decodes a message on its paging sub-channel. But DSC should not exceed its initial value. If the decoding fails, DSC is decremented by 4. If DSC <= 0, a DL signaling channel fault occurs. The DL signaling channel fault causes a cell reselection. 3) Different settings for different types of base station. If there is a BTS2X in the location area and the setting of this parameter is too small, the CCCH will be over-loaded. It is recommended to set the parameter to 5 or 6 in this case. T3212 Range: 0–255 Unit 6 minutes Default: 20~30 (urban), 10~20 (suburb), 8~10 (mountains) It is advised to select a greater value for T3212 (i.e. 16h, 20h, 25h, etc.) in the area with large traffic, while a smaller value for T3212 (i.e. 3, 2 etc.) in the area with small traffic. In order to assign T3212 with a proper value, it is necessary to perform overall and long term measurement on the objects in the running network in respect of their processing ability and traffic on them (processing ability of MSC and BSC, the load of A-interface, Abis interface, Um interface, HLR and VLR). T3212 can be assigned with a greater value once overload occurs to any object. Time limits of periodical location updating in VLR/BSC can be used flexibly to improve system connection rate, increase LAC capacity while decreasing ineffective calls. Description: The periodical location updating timer. In VLR, there is another parameter called the periodical location updating timer. The shorter the periodical location updating time, the better the overall network service performance. But, the greater network signaling load will lower the radio resources availability rate. In addition, this will increase the MS power consumption, so that the MS average standby time is greatly shortened. Consider the processing ability of MSC and BSC, the load of A-interface, Abis interface, Um Huawei Technologies Proprietary 2-21
  27. 27. Data Configuration Reference − Network Planning ParametersM900/M1800 Base Station Controller Chapter 2 Data Configuration interface, HLR and VLR before setting this parameter. Generally, the larger value should be set for the continuous coverage of urban area and the smaller value for suburbs, rural, or blind spots. Note: 1) In MSC, the periodical location updating timer must be greater than the value of BSC. 2) Due to the periodical location update principle of the GSM system, sometimes even the MS is on but no location update request is sent for a long period, it will be identified as implicit off-line. When the MS cell is reselected to another cell (in the same location area), if the T3212 of the new cell is different from that of the old cell, it will be restarted by the T3212 timeout value. If the values of this parameter are different for the cells in the same location area, the MS may not be able to initiate a location update process for a long period under some situations. In this case, the MS will be identified as “implicit off-line”. The MS will receive a voice recording of “The phone you are calling is off line” The parameter value of different cells that share the same LAC, must be the same. Radio Link Timeout Range: 4–64, with a step-length of 4 Unit SACCH period (480ms) Default: Area with very little traffic (remote area): 52~64 Area with less traffic or large coverage (suburbs or rural area): 36~48 Area with large traffic (urban area): 20~32 Area with very large traffic (covered by micro cells): 4~16 For those cells with blind points or the area in which the traffic is interrupted very often, increase the value of this parameter to help resuming the communication. Description: See Protocol 0408 and 0508. MS uses this parameter to determine when to disconnect the connection when SACCH decoding fails. Once MS is assigned with SDCCH, it starts the timer S with its initial value being this parameter. S decrements by 1 every time when an SACCH decoding fails and S increments by 2 every time when a SACCH decoding succeeds. If S = 0, it indicates the DL radio link is faulty. Thus, the release or re-establishment of connection is guaranteed to be performed on those connections whose quality level has deteriorated to an intolerable level. But if the parameter is too small, it will cause call-drop due to radio link faults. While when it is too large, MS will not release the resource in a long time, thus lowering the resources availability rate (this parameter works for the downlink only). MS_TXPWR_MAX_CCH Huawei Technologies Proprietary 2-22
  28. 28. Data Configuration Reference − Network Planning ParametersM900/M1800 Base Station Controller Chapter 2 Data Configuration Range: 0~31 For cells of GSM900 and GSM1800, the corresponding dBm value varies with the control level. For GSM900, the 32 maximum transmission power control levels are: {39,39,39,37,35,33,31,29,27,25,23,21,19,17,15,13,11,9,7,5,5,5,5,5, 5,5,5,5,5,5,5,5} For GSM900, the 32 maximum transmission power control levels are: {30,28,26,24,22,20,18,16,14,12,10,8,6,4,2,0,0,0,0,0,0,0,0,0,0,0,0,0, 0,36,34,32} Unit grade Default: 5(900M), 0(1800M) Description: The maximum MS transmitting power level. This parameter is sent in the BCCH system information. It affects MS behavior in the idle mode and is used to calculate C1 and C2 values so as to determine cell selection and cell reselection. Note: The maximum MS transmitting power level. It is sent in the system message of BCCH to affect the MS behavior in idle mode. It is also used to calculate the values of C1 and C2 to determine the cell selection and reselection. C1 = RLA_C – RXLEV_ACCESS_MIN - MAX ( ( MS_TXPWR_MAX_CCH –P), 0) where RLA_C is the average MS receiving level, RXLEV_ACCESS_MIN is the minimum receiving level for the MS accessing the network, MS_TXPWR_MAX_CCH is the maximum transmitting power level of the control channel for the MS and P is the maximum transmitting power level of the MS. This parameter determines the output power level adopted by an MS when it has not received the power control command. See Protocol 0508. The smaller this parameter, the greater the MS output power. MS near BTS will cause great side-channel interference to this cell, and affect the access and conversation quality of other MS. The greater this parameter, the less the MS output power, and this will lower the access success rate of MS at the edge of the cell. RXLEV_ACCESS_MIN Range: 0–63, (-110 dBm–-47 dBm) Unit Grade Default: 8 Description: Minimum MS received signal level. See Protocol 0508. It indicates the minimum receiving signal level required for MS to access the system. Note: If this parameter is too small, it will cause MS to access network Huawei Technologies Proprietary 2-23
  29. 29. Data Configuration Reference − Network Planning ParametersM900/M1800 Base Station Controller Chapter 2 Data Configuration easily. Meanwhile, the cell load and call-drop possibility will be increased. Therefore, consideration should be given to the balance between uplink and downlink. Half rate supported Range: Yes, No Unit - Default: No Description: Used in network to inform MS whether the system supports half rate. Huawei provides two schemes of channel rate allocation: “MSC controlled channel rate allocation” and “BSC controlled channel rate allocation”. Which one will be adopted depends on BTS 0 of [Call parameter II] in Software Parameter Table of OMC data configuration system. [Call parameter II] BIT 0 Range: 0 and 1 Description: ”0”: MSC required rate allocation is used. That is, allocate half-rate TCH or full rate TCH as per MSC requirements. ”1”: BSC required rate allocation is used. That is, BSC decides whether to allocate half-rate TCH or full rate TCH first as per the current traffic etc. Default value: 1. MSC controlled channel rate allocation. MSC radio channel allocation scheme. If the type of the channel for allocation by MSC is “only full rate” or “only half-rate”, only the channels of complete matched rate can be allocated. If the type of the channel for allocation is “preferred full rate”, all the channels with full rate TCH will be allocated only if they meet the corresponding conditions. If the type of the channel for allocation is “preferred half rate”, all the channels with half rate TCH will be allocated only if they meet the corresponding conditions. In order to allocate channels completely following MSC’s assignment during A interface interconnection test, we still adopt the single MSC radio channel allocation scheme, although it is hard to achieve the most satisfactory network capacity and voice quality by this channel allocation scheme. BSC controlled channel rate allocation. An improvement of MSC controlled channel rate allocation. If the type of the channel for allocation by MSC is “only full rate” or “only half-rate”, only the channels of complete matched rate can be allocated. If the type of the channel for allocation is “preferred full rate” or “preferred half rate”, the full rate TCHs will be allocated first Huawei Technologies Proprietary 2-24
  30. 30. Data Configuration Reference − Network Planning ParametersM900/M1800 Base Station Controller Chapter 2 Data Configuration to ensure the conversation quality if there are many idle full rate TCHs, while the half-rate TCHs will be allocated first to ensure the network capacity if there are a few of idle full rate TCHs. In detail, if the Number of idle full rate TCHs > Threshold (configured in OMC data configuration system) of preferred idle full rate TCHs, the full rate TCHs will be allocated first. If the Number of idle full rate TCHs < Threshold (configured in OMC data configuration system) of preferred idle full rate TCHs, the half rate TCHs will be allocated first. CRH Range: 0–14 Unit 2 dB Default: 4 Description: Cell Selection Hysteresis, used for cell reselection between different LAC. Each change of location area requires a location update to be performed, which increases signaling load. In order to prevent Ping-Pong effects for cell selection across location area borders, a hysteresis, defined by CRH, is used. The purpose of this parameter is to avoid frequent location updating. The greater this parameter value, the more difficult the cell reselection between different LAC. CBCH CH Description Range: - Unit - Default: - Description: CBCH channel description. It only appears when short message cell broadcast comes into service. As an option of the system message 4, it consists of 6 bytes. The first byte is channel description. The second byte includes channel type, TDMA offset and TN (timeslot No.). The third and fourth bytes include MAIO (high bit) when H=1 (frequency hopping), ARFCN (high bit) when H=0 (no frequency hopping) and TSC information. 4, It includes MAIO (low bit) and HSN information. 5, It includes low bit of ARFCN. CBCH mobile allocation Range: - Unit - Default: - Huawei Technologies Proprietary 2-25
  31. 31. Data Configuration Reference − Network Planning ParametersM900/M1800 Base Station Controller Chapter 2 Data Configuration Description: If FH is used in CBCH channel description, then this parameter must be set. If the No.1 bit of the value is "1", it indicates that the No.1 frequency in the CA list belongs to the MA list. ACS Range: Yes, No Unit - Default: No Description: Additional reselection parameter indication, used to inform MS where to get the related cell reselection parameter during cell reselection. In the case of ACS=0, it is meaningless in system information 3; while it is valid in system information 4, MS should get the PI and the related parameters involving in the calculation of C2. In the case of ACS=1, MS should get the PI and the related parameters involving in the calculation of C2 from the system information 7 and 8. PI Range: Yes (1), No (0) Unit - Default: Yes Description: Cell reselection parameter indication, sent on the broadcast channel. It is used to determine whether CRO, TO, and PT are used. In fact, it informs MS whether to adopt C2 for the cell reselection. See Protocol 0408 and 0508. The cell reselection caused by parameter C2 has an interval of at least 5 second so as to avoid frequent MS activation of the cell reselection process. Note: The MS will calculate C1 and C2 of the serving cell at a minimum of every 5 seconds. When necessary, it will re-calculate C1 and C2 value of all non-serving cells (neighboring cells). The MS constantly checks the following conditions: Whether the path loss (C1) of the current serving cell drops below 0 within 5 s. If yes, it shows too much path loss of this cell. The C2 value of a suitable non-serving cell always exceeds that of serving cells in 5 s, and meets the following conditions: 1) If a new cell is in a different location area, the C2 value of this new cell minus CRH (from the system information of the serving cell) constantly exceeds the C2 value of the serving cell for 5 s period. 2) If a cell reselection has occurred within the last 15 s, then the C2 value of the new cell minus 5 dB constantly exceeds the C2 value of the serving cell for 5 s period. A new cell that meets the conditions above is a better cell. When a better cell exists, the MS will have cell reselection. Cell reselection Huawei Technologies Proprietary 2-26

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