Hi, sam_gonlz
I think the best channel configuration is set according to the different needs of each base station. Provide you with some channel configuration selection information
According to the Huawei channel allocation algorithm, each channel is assigned a set of priorities. The BSC refreshes the priorities according to the TRX attributes, configured frequency, channel type required by the call, and characteristics of the call. During channel allocation, the BSC selects a channel with the highest priority from all the channels that meet the requirements and allocates it to the call.
The following priorities are considered during channel allocation:
TRX priority
TRX priority is used to preferentially allocate the channel on a TRX with a higher priority. For example, to reduce BTS power consumption, the TRX priority can be set and the channel on the Broadcast Control Channel (BCCH) TRX is preferably allocated to the call. TRX priority is specified by parameters OPTL and TRXPRIALLOW.
Frequency band capability priority
Frequency band capability priority determines the frequency band capability of the TRX. In a multi-band cell, frequency band capability priority is used to allocate the channel on a suitable TRX to the call. For example, if a cell is configured in the P-GSM and E-GSM bands, the BSC preferentially allocates the channel on the TRX in the E-GSM band to the MS that supports this band. This ensures more accesses to the cell and protects the MS that supports only the P-GSM band from access failure.
If an MS simultaneously supports P-GSM, E-GSM, and R-GSM frequency bands and the cell load is less than or equal to FREQLOADSHARETRAFFTHRSH, the BSC does not consider the frequency band capability priority.
Concentric cell priority
In a concentric cell, the concentric cell priority determines whether the channel in the underlaid subcell or overlaid subcell is allocated.
History occupation priority
If call drops occur frequently on a channel serving the MS, the history occupation priority can be set to lower the priority of the channel. A channel without occurrence of call drops is preferably allocated, reducing the call drop rate. The history occupation priority is specified by HISPRIOALLOW.
Interference priority
Interference priority is used to preferentially allocate a channel with lower interference to the call, improving the speech quality. The interference priority is specified by INTERFPRIALLOW.
If the INTFBANDENHANCESW parameter is set to ON(On), the interference level is reported according to the actual interference level class, and therefore the reported interference level is more accurate.The period-related parameters are as follows:
IntfFilterPeriod specifies the period for filtering interference levels.
IntfReprotPeriod specifies the period for reporting interference levels.
INTERPERIOD specifies both the period for filtering interference bands and the period for reporting interference bands.
In heavy-traffic urban areas, if the INTFBANDENHANCESW parameter is set to ON(On), the call drop rate decreases, the high quality indicator (HQI) remains unchanged or slightly increases, and the proportion of average number of channels in interference bands 4 and 5 remains unchanged.
INTERFPRIALLOW specifies whether to consider interference priorities during channel assignment.
TRX power-saving priority
With the increasingly high TRX integration and the adoption of new power-saving technology, the TRXs produced in different periods differ in terms of power-saving. TRX power-saving priority is used to preferentially allocate a channel on an effectively power-saving TRX to the call, reducing the power consumption of the BTS. The TRX power-saving priority is specified by PWRPRIORALLOW.
PS coordination priority
In GPRS/EGPRS, an MS can be allocated multiple successive timeslots. When the dynamic conversion between the PDCH and TCH is enabled, the current PDCH and adjacent TCHs are reserved, and other channels are allocated to the call.
TCH rate priority
When the cell supports the half-rate TCH, the TCH rate priority is used to allocate a channel of suitable rate to the call. For example, if the current call requires a half-rate TCH, the priority of the full-rate TCH is lowered and the priority of the half-rate TCH is raised.
Timeslot priority
TSPRIORITY specifies the timeslot priority. The BSC preferentially selects a channel with the TSPRIORITY parameter set to a small value to the call.
BCCH priority
BTRXPRIORITYSWITCH specifies whether the BSC preferentially allocates a channel on the BCCH TRX to the call.
