Sounding reference signals with collisions in asymmetric carrier aggregation
摘要
說明書
For the non-paired downlink CC in asymmetric carrier aggregations, also referred to as a “downlink-only” CC, there is no uplink portion of the CC configured for the UE to use for SRS transmission. However, SRS transmissions could still be useful for operation. With downlink-only CCs, the benefit of SRS normally wouldn't be available and the network would have to rely on CSI reports for the downlink-only CCs. However, as the number of CCs grows, this can create significant overhead. Aspects presented in this application address this problem through the use of limited SRS transmission on unused/unconfigured/inactive uplink subframes of the TDD, downlink-only carrier. Aspects presented herein provide a way to manage such SRS limited transmissions on a downlink-only CC when collisions with activity on configured carriers may arise. Aspects presented herein also improve reporting efficiency for several SRS signals or several UEs transmitting SRS.
In each of these circumstances, SRS would be useful, but, without an active uplink component carrier to be paired with the non-paired downlink component carriers, SRS may not be provided according to the usual mechanisms.
