METHOD OF DATA TRANSFER TO USER EQUIPMENT ON HIGH SPEED DEDICATED SHARED TRANSPORT CHANNEL IN CELL PAGING CHANNEL STATE

摘要

The present invention relates to the field of wireless communication. More specifically, it relates to the field of data transfer to User Equipments (UEs) in CELL_PCH mode. When a UE is in CELL_PCH state during a DRX cycle, it listens to a Paging Indicator Channel (PICH) for a time period equal to 't'PICH. If an indication for the availability of data packets to be received by the UE is detected while listening to PICH, the UE enters into a non-DRX cycle and starts monitoring High Speed-Shared Control Channel (HS-SCCH) for a time period equal to 't'HS- SCCH. The data packets addressed to the UE in the CELL_PCH state has to be forwarded by Node-B during the time period 't'HS-SCCH. Due to this stringent time requirements, it is possible that scheduling requirements can not be met for all UEs. The present invention proposes a mechanism to make available the data packets with the Node-B much before the start of the non-DRX cycle to meet the scheduling requirements. When the data packets for a UE become available with the Node-B before the start of non-DRX period, an indication of the start of non- DRX period has to be provided. The indication can be provided with a data packet transmitted on the uplink addressed to a UE in the CELL_PCH state. The High Speed-Downlink Shared Channel (HS-DSCH) data frame is used to for the indication. One of the unused bits of new IE Flags and a Connection Frame Number (CFN) in the data frame are used.