Transmission/reception method and apparatus for uplink MIMO retransmission in LTE system

摘要

A transmission/reception method and apparatus for a mobile communication system supporting uplink MIMO is provided. In the transmission method, a User Equipment (UE) transmits two transport blocks according to a predetermined number of layers and respective precoding indices, an evolve Node B (eNB) transmits, when one of the transport blocks is lost, a negative acknowledgement for the lost transport block, and the UE sets a precoding index for the lost transport block to a predetermined value to retransmit the lost transport block while maintaining the number of layers.

主权项

1. A transmission method of a User Equipment (UE) supporting spatial multiplexing, the method comprising the steps of:
if the UE does not detect a Physical Downlink Control Channel (PDCCH) intended for the UE, and if a number of negatively acknowledged transport blocks is not equal to a number of transport blocks indicated in a most recent PDCCH associated with a corresponding Physical Uplink Shared Channel (PUSCH):
adjusting retransmission of the corresponding PUSCH using a precoding matrix with an index of 0, and a number of transmission layers equal to a number of layers corresponding to a negatively acknowledged transport block from the most recent PDCCH;calculating at least one UpLink (UL) Demodulation Reference Signal (DMRS) resource according to a cyclic shift field for DMRS in the most recent PDCCH associated with the corresponding PUSCH, and the number of layers corresponding to the negatively acknowledged transport block; andidentifying a Physical Hybrid-ARQ Indicator Channel (PHICH) resource determined based on a lowest Physical Resource Block (PRB) index of the corresponding PUSCH.