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User terminal and radio communication method

專利號
US11178679B2
公開日期
2021-11-16
申請人
NTT DOCOMO, INC.（JP Tokyo）
發(fā)明人
Kazuki Takeda; Satoshi Nagata; Lihui Wang; Liu Liu; Huiling Jiang
IPC分類
H04W4/00; H04W72/12
技術(shù)領(lǐng)域
sr,tti,stti,spucch,ue,ttis,in,pucch,subframe,prohibit
地域： Tokyo

摘要

The present invention is designed so that, even when communication is made using a plurality of transmission time intervals (TTIs), scheduling requests are transmitted adequately. According to one aspect of the present invention, a user terminal has a transmitting/receiving section that transmits and/or receives using a plurality of transmission time intervals (TTIs) of different durations, and a control section that determines a resource to use to transmit a scheduling request (SR) based on at least one of a first TTI and a second TTI having a shorter TTI duration than the first TTI.

說明書

FIG. 7 is a diagram to show an example of SR transmission according to embodiment 1.3.2. In this example, as the SR configuration for long TTIs (1-ms TTIs), a configuration index of 0 (referring to FIG. 1, the SR starting position is subframe #0, and the SR periodicity is five subframes) and a prohibit timer expiration time of 5 ms are configured in the UE. Furthermore, as the SR configuration for short TTIs, a configuration index of 155 (referring to FIG. 4, the SR starting position is sTTI #0 (first slot in subframe #0), and the SR periodicity is two sTTIs), and a prohibit timer expiration time of eight sTTIs are configured in the UE.

In addition, the above sTTI priority control parameter is configured to “enabled.” Assume that the UE has no LL traffic (an STTI SR is not triggered) for a related LCH in first subframe #0.

In this case, the UE does not transmit an SR by using the sPUCCH in sTTI #0, but transmits an SR using the PUCCH in subframe #0, and start the long TTI prohibit timer.

Since LL traffic does not occur until sTTI index #6, the UE does not transmit the SR using the sPUCCH. After that. LL traffic arrives, and the UE transmits an SR using the sPUCCH in sTTI #8, starting the short TTI prohibit timer. Thus, even if the long TTI timer has not expired, the UE can transmit SRs using the sPUCCH.

As described above, according to embodiment 1.3.2, the UE controls SR procedures separately between the PUCCH and the sPUCCH, so that it is possible to reduce the latency in SR transmission. In addition, it is possible to transmit SRs related to predetermined LL traffic quickly, in sTTIs.

Embodiment 1.3.3

權(quán)利要求

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