Patent ID: 8204024

Claim:
A method for supporting downlink JD (joint detection) in a TDD CDMA communication network system, the method comprising: judging whether CAI (code allocation information) in a downlink timeslot will change in a next TTI (transmission time interval), wherein the judging comprises at least one of: judging that the CAI will change when at least one active UE leaves the downlink timeslot; judging that the CAI will change when at least one UE joins the downlink timeslot; judging that the CAI will change when spreading code resource in the downlink timeslot is reallocated to realize optimized configuration of the resource in the downlink timeslot; and judging that the CAI will change when the at least one active UE performs a cell handover; modifying the spreading code resource according to the changed CAI, the modifying of the spreading code resource comprising reclaiming the spreading code resource when the at least active UE leaves the downlink timeslot, allocating the spreading code resource when the at least one UE joins the downlink timeslot, and reallocating the spreading code resource when reallocated to realize optimized configuration of the resource or the at least one active UE performs a cell handover; inserting changed CAI as a specific control information into a specified field in a traffic burst in the downlink timeslot corresponding to current TTI only if the CAI will change, the changed CAI comprising spreading code resources associated with each of a plurality of UEs that uses the downlink timeslot, the changed CAI comprises the CAI after the spreading code resource is either allocated, reallocated, or reclaimed; and sending the traffic burst comprising the specific control information to each of the UEs in the downlink timeslot via a downlink channel, wherein the traffic burst sent to each of the plurality of UEs comprises spreading code resources associated with all of the UEs that use the downlink timeslot.