User terminal and radio communication method
摘要
說明書
Note that the associations between SR configuration indices and SR periodicities/SR offsets may be configured in the UE by higher layer signaling (for example, RRC signaling).
As described above, according to embodiment 1.1, SRs are configured only in the PUCCH, so that it is possible to transmit SRs in a short time even when short TTIs are configured, while still ensuring the coverage of SRs. In this case, by reconfiguring both the SR periodicity and the prohibit timer short, it is possible to control SRs in a way that is suitable for short TTIs.
In embodiment 1.2, an SR is configured in the sPUCCH, and an SR is not configured in the PUCCH. In embodiment 1.2, as for the granularity (fineness) of SR configurations for short TTIs (SR-related parameters (for example, the SR periodicity, the expiration time of the prohibit timer and so on)), it is possible to use units that having the durations of sTTIs, which are shorter than subframes, or use units having the length of long TTIs (for example, subframes). SR-related parameters that are transmitted in the sPUCCH include, for example, the SR configuration index for sTTIs (also referred to as “sr_sTTI-ConfigIndex,” “ISR_sTTI” and so on)”.
An SR configuration index for sTTIs is associated with an SR transmission periodicity for sTTIs (also referred to as “SR_sTTIPERIODICITY”) and an SR sTTI offset (also referred to as “NOFFSET, SR_sTTI”), so that the UE can determine which SR periodicity and sTTI index to use, based on the SR configuration index that is reported.
