Set Idle Basic Parameters of Cell

Set Idle Basic Parameters of Cell(SET GCELLIDLEBASIC) Function Use this command to set basic call idle parameters of a cell. Note 1. When the cell broadcast service is supported and the CBCH is CBCH+SDCCH8, the value of "Num of CCCH blocks Rsved for AGCH" cannot be smaller than 1. 2. When the CCCH is configured as a combined CCCH, the value of "Num of CCCH blocks Rsved for AGCH" ranges from 0 to 2. Otherwise, it ranges from 0 to 7. Parameter Parameter ID

Parameter Name

IDTYPE

Index Type

Parameter Description

Meaning: Type of an index

GUI Value Range: BYNAME(By Name), BYID(By Index)

Actual Value Range: BYNAME, BYID

Unit: None

Default Value: None

Parameter ID

Parameter Name


Recommended Value: None CELLID

Cell Index Meaning: Index of a cell, uniquely identifying a cell in a BSC

GUI Value Range: 0~2047

Actual Value Range: 0~2047

Unit: None

Default Value: None

Recommended Value: None CELLNAME

Cell Name Meaning: Name of a cell, uniquely identifying a cell in a BSC

GUI Value Range: None

Actual Value Range: 1~64 characters

Parameter ID

Parameter Name


Unit: None

Default Value: None

Recommended Value: None ATT

Attach-detach Allowed

Meaning: Attach-detach Allowed (ATT). If this parameter is set to YES, when an MS is powered off, the network does not process any call connection for the MS as a called party. In this way, the network processing time and resources are saved.

GUI Value Range: NO(No), YES(Yes)

Actual Value Range: NO, YES

Unit: None

Default Value: None

Recommended Value: YES TX

TX-integer Meaning: Tx-integer (T for short). This parameter specifies the number of timeslots between two

Parameter ID

Parameter Name


transmissions when an MS sends multiple consecutive channel requests. The access algorithm is defined in GSM Rec. 04.08 to reduce the collisions on the RACH and improve the efficiency of the RACH. The algorithm specifies three parameters: Tx-integer (T for short), maximum number of retransmissions (RET), and S related to channel combination. This parameter works with the configuration of the CCCH to determine the parameter S. The relations between this parameter and the configuration of the CCCH are as follows: When this parameter is set to 3, 8, 14, or 50, S is 55 if the CCCH and SDCCH do not share a physical channel. When this parameter is set to 3, 8, 14, or 50, S is 41 if the CCCH and SDCCH share a physical channel. When this parameter is set to 4, 9, or 6, S is 76 if the CCCH and SDCCH do not share a physical channel. When this parameter is set to 4, 9, or 6, S is 52 if the CCCH and SDCCH share a physical channel. When this parameter is set to 5, 10, or 20, S is 109 if the CCCH and SDCCH do not share a physical channel. When this parameter is set to 5, 10, or 20, S is 58 if the CCCH and SDCCH share a physical channel. When this parameter is set to 6, 11, or 25, S is 163 if the CCCH and SDCCH do not share a physical channel. When this parameter is set to 6, 11, or 25, S is 86 if the CCCH and SDCCH share a physical channel. When this parameter is set to 7, 12, or 32, S is 217 if the CCCH and SDCCH do not share a physical channel.

Parameter ID

Parameter Name


When this parameter is set to 7, 12, or 32, S is 115 if the CCCH and SDCCH share a physical channel. The timeslot for sending messages is a random value from the collection of {0, 1..., MAX(T, 8)-1}. The number of timeslots (excluding the timeslot used to send messages) between two adjacent channel request messages is a random value from the collection of {S, S+1, ..., S+T-1}. When T increases, the interval between two adjacent channel requests increases, and RACH conflicts decrease. When S increases, the interval between two adjacent channel request messages increases, and RACH conflicts decrease, thus improving the usage of AGCH and SDCCH. The access time of the MS, however, is prolonged and the network performance is decreased when T and S increase. Under normal conditions, an appropriate T value should be used to ensure that S is as low as possible, and ensure that AGCH and SDCCH are not overloaded.

GUI Value Range: TX_3(3), TX_4(4), TX_5(5), TX_6(6), TX_7(7), TX_8(8), TX_9(9), TX_10(10), TX_11(11), TX_12(12), TX_14(14), TX_16(16), TX_20(20), TX_25(25), TX_32(32), TX_50(50)

Actual Value Range: TX_3, TX_4, TX_5, TX_6, TX_7, TX_8, TX_9, TX_10, TX_11, TX_12, TX_14, TX_16, TX_20, TX_25, TX_32, TX_50

Parameter ID

Parameter Name


Unit: None

Default Value: None

Recommended Value: TX_32 CBA

Cell Bar Access Meaning: Used together with Cell Bar Qualify to decide the priority status of a cell. Refer to GSM Rec. 04.08. Cell Bar Qualify Cell Bar Access Cell selection priority Cell reselection priority NO NO Normal Normal NO YES Prohibited Prohibited YES NO Low Normal YES YES Low Normal

GUI Value Range: NO(NO), YES(YES)


Unit: None

Parameter ID

Parameter Name


Default Value: None

Recommended Value: The CBA function applies to special scenarios. If this parameter is set to YES and Cell Bar Qualify is set to no, only handovers are allowed in a cell, and direct access of an MS is not allowed. This condition applies to a dual-network coverage cell. For a common cell, this parameter should be set to NO. CBQ

Cell Bar Qualify Meaning: Used together with Cell Bar Access to decide the priority status of a cell. See GSM Rec. 0408. This parameter does not affect cell reselection but cell selection only. Cell Bar Qualify Cell Bar Access Cell selection priority Cell reselection priority NO NO Normal Normal NO YES Prohibited Prohibited YES NO Low Normal YES YES Low Normal



Unit: None

Parameter ID

Parameter Name


Default Value: None

Recommended Value: NO BSAGBLKSRES CCCH Blocks Reserved for AGCH

Meaning: BS-AG-BLKS-RES, indicating the number of the CCCH message blocks reserved for the AGCH. After the CCCHs are configured, the value of this parameter indicates the actual seizure rates of the AGCHs and the PCHs over the CCCHs.


Actual Value Range: 0~7

Unit: None

Default Value: None

Recommended Value: 1 BSPAMFRAMS

Multi-Frames in a Cycle on the Paging CH

Meaning: Number of multiframes in a cycle on a paging sub-channel. In fact, this parameter specifies the number of paging sub-channels that a paging channel in a cell is divided into.

Parameter ID

Parameter Name


In an actual network, an MS does not listen to other paging sub-channels but its belonging paging subchannel only. Refer to GSM Rec. 05.02 and GSM Rec. 05.08. The larger the value of this parameter, the more the number of the paging sub-channels in a cell, and the fewer the number of the users belonging to each paging sub-channel. In this case, the mean uptime of the MS battery can be prolonged. Refer to the computing mode of paging group in GSM 05.02 of GSM Standards. The larger the value of this parameter, however, the larger the time delay of a paging message in a space segment. Thus, the average service performance of the system lowers. Based on the principle of ensuring that overload does not occur to paging channels, you must set this parameter to a value as small as possible. You must regularly measure the overload conditions of the paging channels in a running network and accordingly adjust the value of this parameter properly. A paging message in a location area must be sent in all the cells within this location area at the same time. Therefore, the capacity of a paging channel of each cell in a location area must be the same or nearly the same. The capacity refers to the calculated number of paging sub-channels of each cell.

GUI Value Range: 2_M_PERIOD(2 Multiframe Period), 3_M_PERIOD(3 Multiframe Period), 4_M_PERIOD(4 Multiframe Period), 5_M_PERIOD(5 Multiframe Period), 6_M_PERIOD(6 Multiframe Period), 7_M_PERIOD(7 Multiframe Period), 8_M_PERIOD(8 Multiframe Period), 9_M_PERIOD(9 Multiframe Period)

Actual Value Range: 940~4230, step: 470

Unit: ms

Parameter ID

Parameter Name


Default Value: None

Recommended Value: 2_M_PERIOD T3212

T3212 Meaning: This parameter specifies the length of the timer for periodic location update.



Unit: min

Default Value: None

Recommended Value: 20 CRH

Cell Reselect Hysteresis Parameters

Meaning: Cell reselection hysteresis. This is one of the parameters used for deciding whether to reselect cells in different location areas. This parameter can avoid the increase of network signaling traffic due to frequent location update and reduce the risk of losing paging messages.

Parameter ID

Parameter Name


GUI Value Range: 0dB, 2dB, 4dB, 6dB, 8dB, 10dB, 12dB, 14dB

Actual Value Range: 0dB, 2dB, 4dB, 6dB, 8dB, 10dB, 12dB, 14dB

Unit: dB

Default Value: None

Recommended Value: 6dB PI

Cell Reselect Parameters Indication

Meaning: Cell Reselect Parameters Indication (PI), sent on the broadcast channel, indicates whether Cell Reselect Offset, Cell Reselect Temporary Offset in the SET GCELLIDLEAD command, and Cell Reselect Penalty Time are used.



Unit: None

Parameter ID

Parameter Name


Default Value: None

Recommended Value: YES NCCPERMIT

NCC Permitted Meaning: A set of NCCs of the cells to be measured by the MS. This parameter is an information element (IE) in the system information type 2 and 6 messages. If a bit of the value of this parameter is set to 1, the MS reports the corresponding measurement report to the BTS. The value of this parameter has a byte (eight bits). Each bit maps with an NCC (0~7) and the most significant bit corresponds to NCC 7. If bit N is 0, the MS does not measure the cell level of NCC N.

GUI Value Range: SELECTION0_PERM(Selection of 0 Perm.), SELECTION1_PERM(Selection of 1 Perm.), SELECTION2_PERM(Selection of 2 Perm.), SELECTION3_PERM(Selection of 3 Perm.), SELECTION4_PERM(Selection of 4 Perm.), SELECTION5_PERM(Selection of 5 Perm.), SELECTION6_PERM(Selection of 6 Perm.), SELECTION7_PERM(Selection of 7 Perm.)

Actual Value Range: SELECTION0_PERM, SELECTION1_PERM, SELECTION2_PERM, SELECTION3_PERM, SELECTION4_PERM, SELECTION5_PERM, SELECTION6_PERM, SELECTION7_PERM

Unit: None

Parameter ID

Parameter Name


Default Value: None

Recommended Value: SELECTION0_PERM1&SELECTION1_PERM-1&SELECTION2_PERM1&SELECTION3_PERM-1&SELECTION4_PERM1&SELECTION5_PERM-1&SELECTION6_PERM1&SELECTION7_PERM-1 CRO

Cell Reselect Offset

Meaning: Cell Reselect Offset (CRO), indicating a correction of the C2. Proper setting of this parameter can reduce the number of handover times, helpful for assigning an MS to a better cell. In a special case that the PT is 31, the larger the CRO value is, the lower the possibility of handing over an MS to the cell. Generally, do not set the CRO to a value larger than 25 dB. The CRO with a too large value will cause uncertain states in a network. The CRO values of the cells with different priorities in a network are almost the same. Refer to GSM Rec. 05.08 and GSM Rec. 04.08. The setting of this parameter affects only the MSs supporting the protocol of GSM Phase 2 or a later version.



Unit: dB

Parameter ID

Parameter Name


Default Value: None

Recommended Value: 0

Example To set basic call idle parameters of a cell (Cell Index = 0; Attach-detach allowed = No; Tx-integer = TX_5; Cell Bar Access = No), run the following command: SET GCELLIDLEBASIC: IDTYPE=BYID, CELLID=0, ATT=NO, TX=TX_5, CBA=NO;

Set Idle Basic Parameters of Cell

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