Patent ID: 9516565
Filing Date: 2016-12-06
CPC Classification: H04W

Claim Text:
1. A packet switching (PS) domain handover method for a GSM terminal, wherein, said method comprising: after a terminal protocol stack receiving a handover command from a network side, notifying a physical layer to release a physical channel with a current cell; said terminal protocol stack sending a synchronization request message to said physical layer to instruct said physical layer to synchronize with a handover target cell; after receiving a synchronization acknowledgement message from said physical layer, said terminal protocol stack sending a residence request message to said physical layer, and said residence request message carrying a system message of said handover target cell from said network side; after residing in said handover target cell based on said system message of said handover target cell, said physical layer feeding back a residence acknowledgement message to said terminal protocol stack; after receiving the residence acknowledgement message sent by said physical layer, said terminal protocol stack sending a handover request message to said physical layer, and said handover request message comprising a handover type and a range of time advancing (TA) values; said physical layer judging whether to continue said PS handover or not according to a parameter contained in said handover request message and a currently stored TA value, and sending a judgment result to said terminal protocol stack; when said judgment result is continuing said PS handover, said terminal protocol stack instructing said physical layer to establish a physical channel with said handover target cell; wherein, said handover request message further comprising an identifier indicating whether to allow to exceed said range of TA values or not; the step of said physical layer judging whether to continue said PS handover or not according to said parameter contained in said handover request message and the currently stored TA values comprising: if said handover type is an asynchronous handover, continuing said PS handover; if said handover type is a synchronous handover, judging whether said TA value is allowed to exceed said range or not, if said TA value is allowed to exceed said range, continuing said PS handover; if said TA value is not allowed to exceed said range, then judging whether said currently stored TA value exceeds said range of TA values or not, if said currently stored TA value does not exceed said range of TA values, continuing said PS handover; if said currently stored TA value exceeds said range of TA values, terminating said PS handover.