Method, system and apparatus for downlink shared channel reception in cooperative multipoint transmissions

摘要

A method and apparatus may be used to enable reception of a downlink (DL) shared channel in a cooperative multipoint transmission (CoMP). The method and apparatus may determine whether CoMP is applied to a transmission. The method and apparatus may acquire other CoMP related information. The method and apparatus may apply to non-transparent CoMP scenarios.

主权项

1. A method implementable in a wireless transmit/receive unit (WTRU) in communication with a plurality of transmission (Tx) points, comprising:
receiving radio resource control (RRC) signaling including first and second parameters of a demodulation reference signals (DM-RS) configuration associated with the plurality of Tx points; receiving, on a downlink control channel associated with a forthcoming coordinated downlink transmission to the WTRU, downlink control information including an indication of an antenna port index, scrambling identity and number of layers; determining the scrambling identity based on the indication and on whether a single codeword of a plurality of codewords is enabled or multiple codewords of the plurality of codewords are enabled; on condition that the scrambling identity is determined to be a first value:
selecting the first parameter; andgenerating a first DM-RS sequence for receiving DM-RS of the coordinated downlink transmission using the first parameter and the first value of the scrambling identity as inputs for initializing the first DM-RS sequence; and on condition that the scrambling identity is determined to be a second value:
selecting the second parameter; andgenerating a second DM-RS sequence for receiving DM-RS of the coordinated downlink transmission using the second parameter and the second value of the scrambling identity as inputs for initializing the second DM-RS sequence.