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Sounding reference signals with collisions in asymmetric carrier aggregation

專利號
US11159289B2
公開日期
2021-10-26
申請人
QUALCOMM Incorporated（US CA San Diego）
發(fā)明人
Alberto Rico Alvarino; Wanshi Chen; Peter Gaal; Jing Sun; Hao Xu; Srinivas Yerramalli
IPC分類
H04L5/00; H04L5/14; H04W72/04; H04W56/00
技術(shù)領(lǐng)域
srs,ue,uplink,cc,downlink,may,ccs,enb,subframe,in
地域： CA CA San Diego

摘要

An apparatus may use inactive uplink portions of a downlink CC to transmit SRS to an eNB. At times there may be a collision between the SRS transmission and uplink transmissions or downlink transmissions on another CC. The apparatus receives a carrier aggregation configuration for a first downlink CC and a second CC, determines to transmit an uplink transmission on the second CC or to receive a downlink transmission on the second CC, determines that the SRS would at least partially collide with the uplink transmission or the downlink transmission, and determines to adjust at least one of the uplink transmission, the SRS transmission, or reception of the downlink transmission based on the determination of the collision and an interruption time to transmit the SRS in the uplink portion of the first CC.

說明書

In a third option, the UE may determine whether to interrupt the uplink transmission on CC1 or CC3 based on an exchange of messages between the UE and the eNB. The UE may transmit information to the eNB indicating its CA capability. This information may include which CCs the UE may switch among. For example, the UE may be able to switch between CC1 and CC2 of FIG. 7B but not between CC3 and CC2. The eNB may use the CA capability of the UE and the additional information to configure the UE with a source CC and a target CC for switching. For example, the eNB might configure the UE for switching between CC1 to CC2 and between CC3 and CC4, where CC1 and CC3 are uplink CC and CC2 and CC4 are downlink CC used for the transmission of SRS. The eNB may also return a subset of CCs from which the UE should determine to switch. Therefore, the UE may determine how/when to switch among carriers based on an indication signaled to the UE.

Sounding Multiple Component Carriers

The UE may need to sound a number of carriers. As described above, UE may be configured with a larger number of downlink CCs than uplink CCs. In one example, the UE may be configured with a ratio of 5 downlink CCs to 1 uplink CC. It may be helpful for the UE to be able to sound the multiple downlink CCs in a reduced amount of time. For example, a UE may want to sound 6 CCs in 1 ms. This sounding may require switching between multiple carriers. If the UE is limited to 1 SRS per subframe, it make take an undesirable amount of time to sound all of the carriers.

權(quán)利要求

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