Patent ID: 8855639

Claim:
A method of allocating a connection identifier (CID) when a handover is performed, the method comprising: transmitting a handover request message to a serving base station; and receiving, at a target base station, a handover response message including CID update information used by the target base station, wherein the CID update information includes information of at least one allocated transport CID (TCID) used by the target base station, wherein the allocated TCID information includes: a start index of an allocation position of the at least one allocated TCID among a plurality of sequentially indexed TCID candidates, and a bitmap string having a length of at least one bit, the bitmap string indicating the allocation position of the at least one allocated TCID among the plurality of TCID candidates in order according to the sequential indexes, wherein a total number of “1” bits of the bitmap string indicates a total number of the at least one allocated TCID.