Method and apparatus for providing synchronization during hard h

Details Method and apparatus for providing synchronization during hard h Method and apparatus for providing synchronization during hard h

1997-04-25

1999-09-07

Kizou, Hassan

Multiplex communications

Communication over free space

Having a plurality of contiguous regions served by...

370335, 455439, H04Q 700, H04J 1300

Patent

active

059497718

ABSTRACT:
At the beginning of handoff processing at a target base-station, the duplicate message detection mechanism within the layer 2 (L2) signaling layer is disabled such that the target base-station processes all received messages. When the target base-station receives and processes a Handoff Completion message, the target base-station resets all of it's duplicate detection flags to the L2 state at the start of a communication (call) except for the Handoff Completion message itself. The acknowledgment sequence number within L2 is then set to the message sequence number sent within the received Handoff Completion message. Since L2 synchronization is provided when the acknowledgment sequence number and the message sequence number are common, all acknowledgments via L2 are sent after hard handoff is completed.

REFERENCES:
patent: 5200957 (1993-04-01), Dahlin
patent: 5203010 (1993-04-01), Felix et al.
patent: 5444766 (1995-08-01), Farwell et al.
patent: 5594718 (1997-01-01), Weaver, Jr. et al.

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