Sounding reference signal transmission in carrier aggregation

摘要

A cell-specific sounding reference symbol (SRS) subframe configuration and UE-specific SRS configuration are defined for carrier aggregation. For the cell-specific SRS subframe configuration, the same cell-specific SRS subframes are configured for all uplink (UL) carrier components (CCs). For the UE-specific SRS configuration, different configurations are applied for UL CCs. Also, to reduce signaling overhead, the different UE-specific SRS configuration is signaled by using an offset on top of the UE-specific SRS configuration of a primary component carrier (PCC).

主权项

1. A method for transmitting a sounding reference symbol (SRS) comprising:
defining, in conjunction with carrier aggregation, a SRS configuration for a plurality of uplink component carriers (UL CCs) being aggregated for use by one user equipment transmitter, the SRS configuration comprising:
a specification of a first plurality of offset values, the first plurality of offset values specifying offsets for transmission of SRS on a primary component carrier (PCC); anda specification of a plurality of secondary offset value indicators, each respective secondary offset value indicator in the plurality of secondary offset value indicators indicating a respective offset value within the first plurality of offset values; determining whether a SRS and other uplink channels are transmitted in the Physical Uplink Shared Channel (PUSCH) on multiple uplink (UL) component carriers (CCs) in a subframe; and, specifying, based on determining that the SRS and the other uplink channels are transmitted in the PUSCH on multiple uplink component carriers, a multiplexing rule for simultaneous transmission during the subframe of a SRS transmission and the other uplink channels on the multiple uplink component carriers, the specifying the multiplexing rule comprising specifying transmission of an SRS on at least one secondary component carrier (SCC) with at least one secondary offset value indicator within the plurality of secondary offset value indicators.