Transmitting uplink data in a CDMA system according to a channel environment

摘要

A CDMA communication system includes a Node B 202, a user equipment (UE) 204 located in the region of Node B 202, and a neighbour Node B 203. When the UE 204 is located in a soft handover region, where the coverage area of neighbour Node B 203 overlaps with that of Node B 202, its channel environment is usually very poor. Therefore, whilst not being in the soft handover region, the UE 204 transmits uplink data to the Node B 202 for a first predetermined transmission time interval (TTI), whereas when the UE 204 is in the soft handover region, it transmits uplink data to Node B 202 and neighbour Node B 203 for a second predetermined TTI. Because a UE 204 located in a non-soft handover region has a relatively good channel environment, it can perform high-speed data transmission using relatively high transmission power at shorter periods TTISHORT, whereas a UE 204 located in a soft handover region can perform stable data transmission at longer periods TTILONG.