huawei cdd reference_gbss12

MO Parameter ID Parameter Name

GCELLIDLEAD ACS

GCELLIDLEAD TO

GCELLIDLEAD PT

GCELLIDLEBASIC ATT Attach-detach Allowed

GCELLIDLEBASIC TX TX-integer

GCELLIDLEBASIC CBA Cell Bar Access

GCELLIDLEBASIC CBQ Cell Bar Qualify

Additional Reselect Parameter Indication

Cell Reselect Temporary Offset

Cell Reselect Penalty Time

GCELLIDLEBASIC BSAGBLKSRES

GCELLIDLEBASIC BSPAMFRAMS

GCELLIDLEBASIC T3212 T3212

GCELLIDLEBASIC CRH

GCELLIDLEBASIC PI

GCELLIDLEBASIC NCCPERMIT NCC Permitted

CCCH Blocks Reserved for AGCH

Multi-Frames in a Cycle on the Paging CH

Cell Reselect Hysteresis Parameters

Cell Reselect Parameters Indication

GCELLIDLEBASIC CRO Cell Reselect Offset

Meaning Feature Name

IMSI Detach

Used for notifying MSs where to retrieve relevant parameters during cell reselection.The default value of this parameter is 0 in system message 3 and, has no special significance.In system message 4, if the value of this parameter is 0, it means that the MSs must retrieve the PI parameters and other parameters relevant to cell reselection and the parameters relevant to C2 calculation from the remaining bytes of system message 4.If the value is 1, it means that the MS must retrieve the parameters from the remaining bytes of system message 7 or 8.

Basic Cell Re-selectionSystem Information Sending

Cell Reselect Temporary Offset (TO) indicates the temporary correction of C2. This parameter is valid only within the value specified by "Cell Reselect Penalty Time". For details, see GSM Rec. 05.08 and 04.08. This parameter applies to only GSM Phase II MSs.

Basic Cell Re-selection

Cell Reselect Penalty Time (PT) is used to ensure the safety and validity of cell reselection because it helps to avoid frequent cell reselection. For details, see GSM Rec. 05.08 and 04.08.


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.

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

Radio Common Channel ManagementLocation Updating

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 priorityNO NO Normal NormalNO YES Prohibited ProhibitedYES NO Low NormalYES YES Low Normal

Basic Cell SelectionBasic Cell Re-selection

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 priorityNO NO Normal NormalNO YES Prohibited ProhibitedYES NO Low NormalYES YES Low Normal

Basic Cell SelectionLocation Updating

This parameter specifies the length of the timer for periodic location update. Location Updating

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.

Radio Common Channel ManagementLocation UpdatingPaging

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.In an actual network, an MS does not listen to other paging sub-channels but its belonging paging sub-channel 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.

PagingRadio Common Channel Management

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.

Basic Cell Re-selectionLocation UpdatingPaging

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.

Basic Cell Re-selectionSystem Information Sending

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.

Basic Cell SelectionBasic Cell Re-selectionSystem Information Sending

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.


Value Type GUI Value Range Actual Value Range Unit

Enumeration Type COMPUL0, COMPUL1, FLEX None

Interval Type 0~7 0~7 None

Interval Type 0~31 0~31 s

Enumeration Type NO(No), YES(Yes) NO, YES None

Enumeration Type None

Enumeration Type NO(NO), YES(YES) NO, YES None


COMPUL0(Compulsory 0), COMPUL1(Compulsory 1), FLEX(Flexible)

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)

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

Interval Type 0~7 0~7 None

Enumeration Type 940~4230, step: 470 ms

Interval Type 0~255 0~1530, step: 6 min

Enumeration Type 0dB, 2dB, 4dB, 6dB, 8dB, 10dB, 12dB, 14dB dB


Bit Field Type None

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)

0dB, 2dB, 4dB, 6dB, 8dB, 10dB, 12dB, 14dB

SELECTION0_PERM, SELECTION1_PERM, SELECTION2_PERM, SELECTION3_PERM, SELECTION4_PERM, SELECTION5_PERM, SELECTION6_PERM, SELECTION7_PERM

SELECTION0_PERM, SELECTION1_PERM, SELECTION2_PERM, SELECTION3_PERM, SELECTION4_PERM, SELECTION5_PERM, SELECTION6_PERM, SELECTION7_PERM

Interval Type 0~63 0~126, step: 2 dB

Default Value Recommended Value MO_IDRobi Value

FLEX FLEX GCELLIDLEAD_ACS 0

0 0 GCELLIDLEAD_TO 0

0 0 GCELLIDLEAD_PT 0

YES YES GCELLIDLEBASIC_ATT 1

TX_32 TX_32 GCELLIDLEBASIC_TX 14

NO GCELLIDLEBASIC_CBA 0

NO NO GCELLIDLEBASIC_CBQ 0

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.

1 1 GCELLIDLEBASIC_BSAGBLKSRES 1

2_M_PERIOD 2_M_PERIOD GCELLIDLEBASIC_BSPAMFRAMS 2

20 20 GCELLIDLEBASIC_T3212 30

6dB 6dB GCELLIDLEBASIC_CRH 3

YES YES GCELLIDLEBASIC_PI 1

GCELLIDLEBASIC_NCCPERMIT 255SELECTION0_PERM-1&SELECTION1_PERM-1&SELECTION2_PERM-1&SELECTION3_PERM-1&SELECTION4_PERM-1&SELECTION5_PERM-1&SELECTION6_PERM-1&SELECTION7_PERM-1

SELECTION0_PERM-1&SELECTION1_PERM-1&SELECTION2_PERM-1&SELECTION3_PERM-1&SELECTION4_PERM-1&SELECTION5_PERM-1&SELECTION6_PERM-1&SELECTION7_PERM-1

0 0 GCELLIDLEBASIC_CRO 0

Impact Parameter Relationship

Cell None

Cell None

Cell None

Cell None

Cell None

Cell None

Cell None

Cell None

Cell None

Cell None

Cell None

Cell None

Cell None

Cell None

Caution Attribute

Radio

None Radio

None Radio

Radio

None Radio

Radio

Radio

ACS is usually set to 0 because system information 7 and 8 messages are seldom used in common cells. ACS should be set to 1 if system information 7 and 8 messages are used in a cell and C2 is used for cell reselection.

The ATT must be set to the same value for different cells in a same location area. If not, some MSs after power-on may not act as a called party until they have waited for the period specified by "T3212".

If the value of "Cell Bar Access" is YES and the value of "Cell Bar Qualify" is NO, new call access is prohibited but handover access is allowed.

If the value of "Cell Bar Access" is YES and the value of "Cell Bar Qualify" is NO, new call access is prohibited but handover access is allowed.

Radio

Radio

Radio

None Radio

None Radio

None Radio

As defined in the protocol, the value of this parameter cannot be 0 in the following cases:The BSC needs to send system messages over the extended BCHs. CBCHs are configured.When the GSMR is enabled, NCHs are configured.

A paging block (four continuous CCCH timeslots) can bear two IMSI paging messages, four TMSI paging messages, or two AGCH immediate assignment message. If the signaling downlink is faulty when an MS is idle, the rule of downlink failure is based on the signaling downlink failure counter DSC. When an MS stays in a cell, the DSC is initialized as an integer the closest to 90/N ("N" is BS_PA_MFRMS, number of multiframes in a cycle on a paging sub-channel, whose value range is 2 to 9.) When the MS tries to encode the messages over its paging sub-channels: Every time the MS succeeds in encoding a message, the DSC increases by 1 but cannot exceed the initially set value; if the MS fails in encoding a message, the DSC decreases by 4. If the DSC is smaller than or equal to 0, a signaling downlink failure occurs, which causes cell reselection. The value of this parameter varies with the BTS types.

It is recommended that you select a greater value, such as 16, 20, or 25, in the area with heavy traffic, but a smaller value, such as 2 or 3, in the area with light traffic. To properly specify the value of this parameter, it is necessary to perform overall and long-term measurement on the entities involved regarding their processing capability and traffic, such as the processing capability of the MSC and BSC, and the load on the A interface, Abis interface, Um interface, HLR, and VLR.The location update period in the MSC must be greater than that in the BSC.In the GSM system, it is possible that a powered-on MS is identified as implicit off-line if the MS sends no location update request within a long period.When the MS reselects another cell (in the same LAC), the MS is restarted through T3212 timeout if the T3212 of the new cell differs from that of the original cell.When this parameter differs in the cells of the same LAC, it is possible that the MS is identified as implicit off-line if the MS sends no location update request for a long period. In this case, system plays "The subscriber you dial is power off." even though the called MS is on.In an LAC, the value of this parameter should be the same in all cells.

RadioThe settings of RXLEV-ACCESS-MIN and CRO should guarantee that cells with same priority have the same cell reselect offset.

huawei cdd reference_gbss12

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