Transmission diversity and multiplexing for HARQ-ACK signals in communication systems

摘要

A method and apparatus are described for a User Equipment (UE) to transmit in a control channel ACKnowledgement signals associated with a Hybrid Automatic Repeat reQuest process (HARQ-ACK signals) in response to receiving Transport Blocks (TBs) transmitted from a base station. The UE conveys the HARQ-ACK information by selecting one resource from multiple resources in the control channel and by selecting a constellation point of the modulation scheme for the HARQ-ACK signal. Transmission diversity is supported using different control channel resources that are already available to the UE without configuring additional resources. Design principles are described to optimally map the HARQ-ACK information to control channel resources and modulation constellation points for a Time Division Duplex (TDD) system and for a Frequency Division Duplex (FDD) system.

主权项

1. A method for a user equipment (UE) to transmit to a base station acknowledgement information for a physical downlink shared channel (PDSCH), the method comprising:
identifying a first uplink control channel resource based on a first control channel element (CCE) used to transmit a physical downlink control channel (PDCCH) corresponding to the PDSCH; identifying a second uplink control channel resource based on the first CCE+1, for a transmission mode that supports up to two transport blocks (TBs); and transmitting the acknowledgement information on one of the first uplink control channel resource and the second uplink control channel resource, wherein the first uplink control channel resource and the second uplink control channel resource are associated with a first cell.