When there is a co-existing GSM RAN, excess traffic in a WCDMA cell may be offloaded to GSM If a call is chosen for Directed Retry to GSM, the request for the speech RAB will be rejected with cause "Directed retry" and then a request is made to the core network to relocate the UE to a specific GSM cell, using the Inter-RAT handover procedure. This handover is a blind one since the target cell is chosen not based on UE measurements. Therefore, the target cell must be co-located with the WCDMA cell. Co-located GSM cells are assumed to have similar coverage and accessibility as their respective WCDMA cells.
Click Here to discuss Ericsson WCDMA and HSDPA issues
Click Here to Discuss NSN GSM-GPRS-EDGE Problems Click Here to discuss Ericsson WCDMA and HSDPA issues
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