Patent ID: 8670410
Filing Date: 2014-03-11
Classification: H04L

Abstract:
1. A method of wireless communication, comprising: determining a first number of ACK/NACK bits for acknowledging downlink data transmissions on a first configuration of a plurality of component carriers (CCs) configured for a multi-carrier user equipment (UE); selecting a first mapping of ACK/NACK bits to uplink control channel resources based on the first number of ACK/NACK bits, the first mapping comprising a fallback configuration for downlink data transmissions on a single component carrier, the fallback configuration being used at least in response to a base station reconfiguring the first configuration of the plurality of CCs, wherein the fallback configuration matches a single component carrier configuration for downlink data transmissions in a second mapping of ACK/NACK bits to uplink control channel resources; determining uplink control channel resources for acknowledging the downlink data transmissions on the first configuration of CCs based on the first mapping; sending ACK/NACK information for the downlink data transmissions, on uplink control channel resources based on the first mapping; receiving a higher-layer command to change the first configuration of component carriers; and determining, in response to receiving the higher-layer command, uplink control channel resources for acknowledging downlink data transmissions based on the fallback configuration of the first mapping.