Cell Parameters (Long List)

 

 

CELL PARAMETERS 1.  Network Identity Parameter 1.1  Cell Global Identity (CGI)  = MCC+MNC+LAC+CI  1.1.1  Mobile Country Code (MCC): It indicates the home country of the mobile subscriber. Composed of 3 decimal numbers. The coding range is decimal 000~999. 1.1.2  Mobile Network Code (MNC): used to uniquely identify a specific GSM PLMN network in a certain country (decided by MCC).composed of two decimal numbers. The coding range is decimal 00~99 1.1.3  Location Area Code (LAC): To locate the location of MS, available range is from 0001H to FFFEH. The code 0000H and FFFFH cannot be used 1.1.4  Cell Identity (CI): To uniquely identify each cell in the GSM PLMN, CI C I is composed of 16 bits, The available range is 0~65535 1.2  Base Station Identity Code (BSIC) = NCC + BCC  1.2.1  Network Color Code (NCC): MS uses it to distinguish adjacent BTS that belong to different GSM PLMN. Composed of 3 bits, with the range of 0 to 7 1.2.2  BTS Color Code (BCC): composed of 3 bits. The available range is 0~7 2.  Idle Mode Parameters 2.1  ATT Value Range: Yes, No

Default Value: Yes

Description: It is Attach-detach allowed  2.2  CCCH Conf   Value Range: 1 Compounding Compounding CCCH, 1 Non-Compoundin Non-Compounding g CCCH, 2 Non-Compounding CCCHs, 3 Noncompounding CCCHs, 4 Non-compounding Non-compounding CCCHs Description: The MS needs to know how the CCCH(s) is/are configured, so that it can find and select one to listen to. The CCCH Conf is just used to tell the MS about this matte matter. r. 2.3  BS_AG_BLKS_RES   Value Range: 0~7 (Non-Compounding CCCHs), 0~2 (1 combined CCCH) Default Value: 2 (Non-combined CCCH), 1(1 combined CCCH) Description: It is the number of CCCH channel message blocks that are reserved in one multi-frame for access granted channels (AGCH). 2.4  BS_PA_MFRAMES Value Range: 2~9

Unit: Multi-frame period (51 frames)

Default Value: 2 Multi-frame period Description: It is Paging Channel Multi-frames. It defines the number of o f multi-frames used as a cycle of paging sub-channels 2.5  Period of Periodic Location Update(T3212)  Value Range: 0~255

Unit: 6 minutes

Default Value: 20

Description: It is the Periodic Location Update Timer. It defines the interval of periodic location update. 2.6  Neighbor Cell Description (BA Table)  Table BA1 describes BCCH frequencies of the adjacent cells to be measured when the MS is in idle mode. Table BA2 describes BCCH frequencies of the adjacent cells to be measured when the MS is in dedicated mode. 3.  Call Control Parameters

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  3.1  MS MAX Retrans Value Range: 1, 2, 4, 7

Unit: Time(s)

Default Value: 4 Times

Description: It is one of the random access control parameters. MS MAX Retr Retrans ans is the upper limit of times that MS is allowed to send “Channel Request” in one immediate assignment procedure.  3.2  TX-integer  Value Range: 3~12, 14, 16, 20, 25, 32, 50 Unit: RACH Timeslot (equals to a TDMA frame, 4.615ms)

Default Value: 32

Description: Used to calculate the number of timeslots in the interval between multiple channel re requests quests sent by MS. 3.3  RACH Min. Access Level  Value Range: -121~-47

Unit: dbm

Default Value: -115

Description: The parameter affects the access of an MS. When the receive level of the RACH burst is lower than the threshold, the BTS regards re gards this access as an invalid access and no decoding de coding is performed. 3.4  Radio Link Timeout (RLT)  Value Range: 4~64, the step size is 4

Unit: SACCH period (480ms)

Default Value: 52

Description: This parameter is used for MS to decide downlink disconnection in case of SACCH decoding failures 3.5  SACCH Multi-Frames  Value Range: 0~63 Unit: SACCH period (480ms) Default Value: 31 Description: It is a timer used to t o determine whether the uplink radio link connection fails. BSS judges j udges the uplink radio link failure according to uplink SACCH BER. Every time BTS fails to decode the MR sent from MS, this timer decreases by 1. Every time BTS succeeds to decode tthe he MR, this timer increases by 2. 3.6  NCC Permitted  Value Range: Selection of 0~7 Perm.

Default Value: 11111111

Description: It lists NCC that need be measured by MS. Common Access 3.7  Common Access Control Class  Value Range: Level 0~9 Forbidden

Default Value: 0000000000

Description: One of the parameters of random access control information. It is used for load control of ordinary subscribers, to permit or forbid the network access acc ess of some common level users. “1” stands for forbidden and “0” for permitted. 

3.8  Special Access Control Class  Value Range: Level 10~14 Forbidden

Default Value: 00000

Description: It is used for load control, permitting or forbidding the network access of some special spec ial level users. “1” stands for forbidden and “0” for permitted. 

3.9  MBR (Multi-Band Reporting)  Value Range: 0~3

Default Value: 0

Description: It is used to inform MS to report the adjacent ccells ells in a controllable way. 3.10 ECSC (Early Classmark Sending Control) Value Range: Yes, No

Default Value: No

Description: It indicates if an MS in the t he cell is allowed to use early Classmark sending. 3.11 Emergent Call Disable  Value Range: Yes, No Default Value: No Description: When EC Disable is set to “No”, it means emergency call is permitted. Otherwise it is prohibited.

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  4.  Cell Selection/Reselection Parameters C1 = [RLA_C  – RXLEV_ACCESS_MIN]  – [MAX({MS_TXPWR_M [MAX({MS_TXPWR_MAX_CCH AX_CCH  – P} , 0)] 4.1  RXLEV_ACCESS_MIN  Value Range: 0~63 (-110 dBm ~ -47 dBm)

Default Value: 8

Description: It means the minimum receive signal level required for MS to access a cell. 4.2  MS_TXPWR_MAX_CCH  Value Range: 0~19

Unit: level Default Value: 5 (900MHz cell),0 (1800/1900MHz cell)

Description: Determines the maximum transmit power level of the MS when it begins to acce access ss a cell and has not yet received power control command.  4.3  CBA (Cell Bar Access) Value Range: No, Yes

Default Value: No

Description: Worked together with CBQ to t o set the priority status of tthe he cell in idle mode for cell selection select ion and reselection. 4.4  CBQ (Cell Bar Qualify)  Value Range: No, Yes

Default Value: No

Description: CBQ only affects the cell selection, but is not related to cell reselection. It works with CBA to define the access priorities of cells. C2=C1+CRO-TO*H(PT-T)

When PT is not equal to 31

C2=C1-CRO When PT is equal to 31 4.5  CRO (Cell Reselection Offset)  Value Range: 0~63 (the corresponding level value: 0~126dB, stepped every 2dB). Unit: 2dB

Default Value: 0

Description: It is a parameter in C2 calculation to give an intentional modification in MS cell reselection. resele ction. 4.6  TO (Cell Reselect Temporary Offset)  Value Range: 0~7 (the corresponding value is 0~60dB, 7 corresponds to “Infinite”).  Unit: 10dB

Default Value: 0

Description: It is a parameter in C2 criterion to give a temporary modification within PT time. 4.7  PT (Cell Reselect Penalty Time)  Value Range: 0~30(the corresponding time is 20~620s), 31(reserved 3 1(reserved for changing the effect of CRO on C2) Unit: Second

Default Value: 0

Description: It is used to ensure the safety and validity of cell reselection bec because ause it helps to avoid frequent cell reselection. 4.8  PI (Cell Reselect Parameters Indication)  Value Range: Yes , No Description: Sent on the broadcast channel of the cell. It is an indication to the existence of o f “Cell Reselect Offset (CRO)”, “Temporary Offset (TO)” and “Penalty Time (PT)”.  4.9  CRH ( Cell Reselection Hysteresis)  Value Range: 0~14, the step size is 2dB

Unit: dB

Description: It is the parameter used when cell reselection happens between two location areas. 5.  Other Parameters 5.1  Call Reestablishment Forbidden  Value Range: Yes, No Default Value: Yes Description: Informing MS whether call reestablishment is allowed or not.

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  5.2  TCH Immediate Assignment  Value Range: Yes, No

Default Value: No

Description: Option "Yes" means that TCH channel can be immediately assigned as signaling and traffic channel when SDCCH has no available resource. The option "No" means mea ns that only SDCCH can be assigned. 5.3  Immediately Assign TCH to MOC/MTC   Value Range: Yes, No

Default Value: No

Description: This parameter specifies whether to assign a TCH to the MS-originated/terminated call in the immediate assignment procedure. If both TCH Immediate Assignment and this parameter are set Yes, the BSC assigns a TCH to the MS-originated/terminated call in the immediate assignment procedure. If there is no TCH available, BSC assigns an SDCCH to the MS-originated/terminated call. 5.4  Immediate Assignment Optimization  Value Range: Yes, No

Default Value: No

Description: This parameter is mainly used for satellite transmission, i.e., to reduce the t he impact of satellite transmissions delay. Yes: when the Transmission Mode of the BTS is Satellite transmission. No: when the Transmission Mode of the BTS is Terrestrial transmission 5.5  Direct Retry  Value Range: Yes, No

Default Value: Yes

Description: This parameter indicates the whether the directed retry on the TCH TC H is allowed. In TCH assignment process, if there is no TCH available, hand over can take place instead of assignment 5.6  Assignment Cell Load Judge Enable   Value Range: Enable, Disable

Default Value: Disable

Description: When the Assignment Cell Load Judge Enabled is set to Yes, the direct retry flow is allowed if the following two conditions are met: The cell supports the direct retry function and the load of the cell is larger than or equal to the Cell C ell Direct Try Forbidden Threshold. 5.7  Cell Direct Try Forbidden Threshold  Value Range: 0~100(%) 

Unit: None

Default Value: 50

Description: If the parameter Assignment Cell Load Judge Enabled is set to Yes, the direct retry process is started and channels are assigned when the cell supports direct retry and the load of the current cell is equal to or greater than the value of Cell Direct Try Forbidden Threshold during channel assignment. 5.8  Directed Retry Load Access Threshold  Value Range: 0~100(%)

Unit: None

Default Value : 85

Description: This parameter is used to adjust the candidate target cells during direct re retry. try. When target cells are selected during direct retry, only the cells whose loads are smaller than or equal to the Directed Retry  Load Access Threshold are selected as candidate target cells. c ells. 5.9  Min Power Level for Direct Try   Value Range: 0~63 (-110dBm~-47dBm)

Default Value :16

Description: This parameter indicates the selection of candidate cell ce ll for direct try. If the receiving level of cell exceeds the value of this parameter, this cell can be selected as candidate target cell. 5.10 Max Resend Times of Phy. Info.  Range Value :1~255

Unit: Times

Default Value :30

Description: This parameter specifies the maximum times Ny1 for re-sending r e-sending physical information. If the number of resending times exceeds Ny1 and BTS still has not received any cor correct rect SAMB frame from MS, BTS

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  will send BSC the connection failure message and handover failure message. After BSC receives the messages, it will release the newly assigned dedicated channel and stop timer T3105. 5.11 T3105  Range Value : 0~255

Unit: 10ms

Default Value : 7

Description: When BTS sends physical information to the MS, the BTS starts the timer T3105. If the timer T3105 times out before receive the SABM frame from MS, BTS B TS re-sends physical information to MS and restarts the timer T3105. 5.12 PWRC  Value range: Yes, No.

Default Value: Yes

Description: It is used to indicate whether to delete received level value o obtained btained from the timeslots of BCCH when MS measures receiving level during base band hopping mode. When it is set to “No”, it means the

inf luence luence of receiving level on BCCH BCC H is in consideration. If it is set to “Yes”, process it in the way mentioned above (delete affect of BCCH Timeslots) 5.13 Cell Extension Type  Value Range: Normal cell, Double TS Ext cell Default Value: Configure this parameter according to the practical situation. Description: It indicates whether a cell c ell is an extended cell and the e extended xtended cell mode. 5.14  Max TA  Value Range: 0~63 (Normal cell), 0~255 (Double TS Ext cell) Unit: Bit period (1 bit = 0.55km) 0 .55km) Default Value: 62 for normal cell, 219 for dual TS extended ce cell ll Description: Maximum Time Advance. It determines the actual coverage area of BTS. When BTS receives rec eives the channel request message, it determines whether w hether channel assignment should take place in the current cell by comparing the TA with the value of this parameter. 5.15  Interference Band Threshold  Value Range: 110~85

Unit: -dBm

Default Values: 110 ( Interference band threshold 0), 105 ( Interference band threshold 1), 98 ( Interference band threshold 2 ), 92 ( Interference band threshold 3 ), 87 ( Interference band threshold 4 ), 85 ( Interference band threshold 5) Description: It decides the corresponding corr esponding value for each interference band (from band 1 to band 5) and used to measure the uplink interference during the SDCCH/TCH(F)/TCH(H) timeslot is in idle mode. 5.16  Interference Calculation Period  Value range: 1~31

Unit: SACCH period (480 ms)

Default Values: 20

Description: Before the BTS transmits the radio resource indication message to the BSC, the interference levels measured on idle channels in the period defined by this parameter are averaged. The average interference level is used to classify the interference levels on idle channels into five interference bands. A too big value of this parameter cannot c annot reflect the change o off interference. A too small value of this parameter wastes the resources. 5.17  UL DTX  Value Range: May use, Shall use, Shall not use

Default Value: Shall use

Description: It is used to indicate whether MS uses DTX function. It shows the DTX state of the MS in the previous measurement period. 5.18 DL DTX 

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  Value range: Yes, No

Default Value: Yes

Description: This parameter indicates whether downlink DTX is used in a cell. ce ll. The use of downlink DTX is also controlled by the DTX switch in the MSC. If downlink DTX is forbidden in the MSC, downlink DTX is not used regardless of the setting of this parameter. If downlink DTX is allowed in the MSC, the setting of this parameter can determine whether downlink DTX is used in the cell. 5.19 T200 T200 timers are used to avoid deadlock during data transfer on the data link layer. On the LAPDm layer, every time a message is sent, the opposite end is requested to acknowledge the reception. If this message is lost for unknown reasons, it will occur that both ends keep waiting, leading to system deadlock. Therefore, a timer should be started when the sender sends a message. If the timer times out, the sender will regard that the receiver has not received the message and will resend the message. 5.20 N200  The maximum resend times are determined determi ned by N200. Different timer values should be set for fo r different LAPDm channels such as SDCCH, FACCH and SACCH. This is because these channels have different transmission rate. 5.21  Use LAPDm N200  Range: Yes, No

Default Value : No

Description: Determines whether BSC delivers LAPDm N200 parameters to BTS. If it configured as Yes, then LPADm N200 parameters will be delivered to BTS, otherwise not.

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