3G/2G Common Load Management

3G/2G Common Load Management

During inter-RAT handover or inter-system direct retry, this feature supports the transfer of load information to reduce inter-RAT ping-pong handover.

During inter-RAT handover from 3G to 2G, the RNC will send the load information of the source cell to 2G through RELOCATION REQUIRED message and may get the load information of target cell from RELOCATION COMMAND message. If the load of target cell is in a high level (over the threshold configured) and the inter-RAT handover from 3G to 2G is triggered not because of coverage, then the inter-RAT handover from 3G to 2G will be cancelled.

During inter-RAT handover from 2G to 3G, the RNC may get the load information of the source cell from RELOCATION REQUEST message. If the load of source cell is not in a high level (less than the threshold configured) and the inter-RAT handover from 2G to 3G is triggered not because of coverage, then the inter-RAT handover from 2G to 3G will be refused.

During inter system direct retry, the procedure and decision is similar to that of inter-RAT handover from 3G to 2G. If the load of target cell is in a high level (over the threshold configured), inter system direct retry will be cancelled.