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Sounding reference signals with collisions in asymmetric carrier aggregation

專(zhuān)利號(hào)
US11159289B2
公開(kāi)日期
2021-10-26
申請(qǐng)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(lèi)
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(shuō)明書(shū)

To provide SRS signaling to such downlink CCs, SRS may be enabled for the downlink CCs while maintaining a single, or a small number of, CC transmissions at a time in order to prevent simultaneous transmissions over a number of CCs that exceeds the UE capability. For example, a single uplink CC may be supported at a time by a UE. It may be desirable to maintain a single carrier waveform for the single CC transmissions to keep lower transmission complexity. The SRS transmissions may be time division multiplexed (TDM) over different CCs. Furthermore, it may be possible to enable non-single carrier waveform transmission over one or more CCs, e.g., by allowing parallel uplink transmissions over two or more CCs, at the expense of additional complexity.

FIG. 7A is a block diagram illustrating carrier aggregation 700 with SRS signaling configured according to one aspect of the present disclosure. Carrier aggregation 700 includes TDD PCC 702 and TDD component carrier 704. The SRS transmissions may be split between component carriers, TDD PCC 702 and TDD component carrier 704. For example, SRS 706 is transmitted at subframe 2 of radio frame 714 on TDD PCC 702, SRS 708 is transmitted at subframe 7 of radio frame 714 on TDD component carrier 704, SRS 710 is transmitted at subframe 2 of radio frame 716 on TDD PCC 702, and SRS 712 is transmitted at subframe 7 of radio frame 716 on TDD component carrier 704. In this manner, SRS 708 and 712 may be used to determine the channel quality for the non-paired downlink component carrier.

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