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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

For power limited UEs, wideband sounding may be performed, but may undesirably reduce SNR. While narrowband SRS transmissions may be used, such narrowband SRSs may require multiple switches by the UE and/or multiple transmissions per carrier in order to sound the whole bandwidth. Therefore, narrowband SRSs with multiple switches might not be efficient.

In order to overcome these challenges, the UE may transmit multiple SRSs per subframe. The SRS transmissions may be in different CCs, and therefore may require retuning. The SRS transmissions may be in different subbands of the same CC. The SRS transmissions may be repetitions in the same subband of the same CC. The configuration of the SRS transmissions may be different. For example, the bandwidth, frequency, location, cyclic shift, comb, etc. may be different for different SRS transmissions within the same subframe. The SRS transmissions may be staggered across subbands or across carriers. The eNB may configure the UE to stagger the SRS transmissions. The eNB may configure multiple UEs with staggered SRS transmissions so that the UEs can efficiently reuse retuning times.

FIG. 9 illustrates a diagram 900 showing a staggered pattern of narrowband sounding in which each of a plurality of UEs transmit SRSs in a staggered pattern for 3 CCs. The eNB may have configured the UEs so that the SRS transmission of one UE is aligned with the retuning of a different UE. This allows multiple UEs to sound the three CCs in an efficient manner. The eNB has configured the UEs so that transmission resources are not wasted while the UEs retune to the next CC.

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