Blind decoding of uplink control channels

摘要

In 3GPP LTE, the uplink ACK and CQI bits are jointly coded prior to transmission to maintain a low peak to average ratio (PAR) waveform. Further, when data needs to be transmitted, the uplink control channels are multiplexed with data prior to transmission. However, due to errors on downlink (DL) and uplink (UL) assignments, an evolved Base Node (eNB) receiver needs to employ a set of rules to decode the control channels, to minimize the number of blind decoding hypotheses. This innovation describes the rules employed by a receiver to reduce complexity and computational overhead in part by assuming that the UE is responding to grant on the downlink while providing for combinations in which one or more types of grants are not received. Energy detection in accordance with metrics and normalizing for differing power controls enables selecting the correct combination for decoding.

主权项

1. A method for facilitating decoding across multiple channels in a wireless communication system, comprising:
transmitting a scheduling event to a served device on a downlink; receiving an encoded transmission from the served device on an encoded uplink channel, the encoded uplink channel being a control channel when the encoded transmission only includes control information; determining a plurality of possible encoded uplink channels based upon the scheduling event, the plurality of possible encoded uplink channels being less than a total number of possible encoded uplink channels; and detecting the encoded uplink channel from the plurality of possible encoded uplink channels based at least in part on energy detection of the encoded uplink channel.