Modify Common Channel Control Parameters of Cell(MOD CELLCCCH)

Function

A configuration command that modifies the common channel control parameters of a cell. In this command, the following parameters uniquely identify the cell:

Cell Index or Cell Name

Note

For GSM900 and GSM850, the default value for MS_TXPWR_MAX_CCH is 5. For DCS1800 and PCS1900, the default value for MS_TXPWR_MAX_CCH is 0.

Parameters

ID Name Description
IDXTYPE Index Type

Meaning:Index Type

Value range:BYNAME(By Name),BYIDX(By Index)

Explanation:Index Type.

Default value:None

CELLIDX Cell Index

Meaning:Cell Index

Value range:0~2047

Explanation: This parameter indicates the source cell index. The source cell index must be unique.

Default value:None

CELLNAME Cell Name

Meaning:Cell Name

Value range:1-32 characters

Explanation: This parameter indicates the name of the source cell. The name of each cell under one BSC must be unique.

Default value:None

RFRESINDPRD Radio Resource Report Period[s]

Meaning:Radio Resource Report Period[s]

Value range:0~255

Explanation:This parameter specifies the interval for the BTS to send radio resource indication messages, informing the BSC of the interference levels on idle channels of a TRX. In the radio resource indication message, the TRX reports the interference level of each idle channel in the measurement period.

For details, see GSM Rec. 08.58 and 08.08.

Default value:None

CCCHLOADINDPRD CCCH Load Indication Period[s]

Meaning:CCCH Load Indication Period[s]

Value range:0~255

Explanation:This parameter specifies the interval for sending the overload messages.

This parameter is used by a BTS to inform the BSC of the load on a CCCH timeslot.For details, see GSM Rec. 08.58.If the load on a CCCH timeslot exceeds the CCCH Load Threshold, the BTS periodically sends the CCCH overload message to the BSC. The CCCH overload messages include the uplink RACH overload messages and the downlink PCH overload messages.

Default value:None

CCCHLOADTHRES CCCH Load Threshold

Meaning:CCCH Load Threshold

Value range:20~100

Explanation:This parameter is used by the BTS to inform the BSC of the load on a CCCH timeslot, that is, the load of the access requests on the RACH and the load of all the messages (such as paging messages and packet immediate assignment messages) on the PCH. For details, see GSM Rec. 08.58.

If the load on a CCCH timeslot exceeds the value of this parameter, the BTS periodically sends the CCCH overload message to the BSC. The interval for sending the CCCH overload message is CCCH Load Indication Period(s).

Default value:None

OVERLOADINTV Overload Indication Period

Meaning:Overload Indication Period

Value range:1~255

Explanation:This parameter specifies the interval for the BTS to send the overload indication message to the BSC.

The overload causes include TRX processor overload, downlink CCCH overload, and AGCH overload. For details, see GSM Rec. 08.58.

Default value:None

RACHLDAVERSLOT Average RACH Load Timeslot Number

Meaning:Average RACH Load Timeslot Number

Value range:0~65535

Explanation:This parameter specifies the number of RACH burst timeslots in a RACH load measurement.

The value of this parameter indicates the interval during which the BSC determines whether an RACH timeslot is busy. For details, see GSM Rec. 08.58.

Default value:None

ABISFCEN SDCCH Congestion Flow Control Allowed

Meaning:SDCCH Congestion Flow Control Allowed

Value range:NO(NO),YES(YES)

Explanation:This parameter specifies whether to allow flow control when the SD channel is congested. When the SD channel is congested, the system information is modified to reduce the number of retransmissions of random access requests and prolong the retransmission interval. In addition, the value of T3122 is increased in the immediate assignment reject message to prolong the interval of MS access attempts.

Default value:None

CANPC PWRC

Meaning:PWRC

Value range:NO(NO),YES(YES)

Explanation:This parameter is contained in the Cell Options IE of the system information type 3 and 6 messages.

If this parameter is set to Yes, the receive level of the MS equals the measured receive level in FH minus the receive level obtained from the timeslots on the BCCH TRX.

Default value:None

FMSMAXOPCC MS_TXPWR_MAX_CCH

Meaning:MS_TXPWR_MAX_CCH

Value range:0~19

Explanation:This parameter specifies the maximum transmit power level of MSs. It is one of the cell re-selection parameters in the system information type 3 message.

This parameter is used to control the transmit power of MSs. For details, see GSM Rec. 05.05.

In a GSM900 cell, the maximum power control level of the MS ranges from 0 to 19, mapping to the following: {43,41,39,37,35,33,31,29,27,25,23,21,19,17,15,13,11,9,7,5} respectively. Generally, the maximum transmit power supported by an MS is level 5 (mapping to 33 dBm). The minimum transmit power supported by an MS is level 19 (mapping to 5 dBm). Other transmit power levels are reserved for high-power MSs.

In a GSM1800 or GSM1900 cell, the maximum power control level of the MS ranges from 0 to 31, mapping to the following: {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} respectively. Generally, the maximum transmit power supported by an MS is level 0 (mapping to 30 dBm). The minimum transmit power supported by an MS is level 15 (mapping to 0 dBm). Other transmit power levels are reserved for high-power MSs.

Default value:None

HRATESPT NECI

Meaning:NECI

Value range:NO(NO),YES(YES)

Explanation:This parameter specifies whether a GSM phase 2 MS uses the establishment causes of GSM phase 1 (NECI = No) or the establishment causes of GSM phase 2 (NECI = Yes). This parameter is set per cell.

Default value:None

Example

Modify the common channel control parameters of a cell (Index Type = BYIDX(By Index); Cell Index = 0; Radio Resource Report Period[s] = 50):
MOD CELLCCCH: IDXTYPE=BYIDX, CELLIDX=0, RFRESINDPRD=50;
Related reference
Add BTS(ADD BTS)
Add Cell(ADD CELL)

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