Method and apparatus for channel usage in unlicensed spectrum considering beamformed transmission in a wireless communication system
地域：
Taipei
摘要
A method and apparatus are disclosed from the perspective of a UE (User Equipment). In one embodiment, the method includes the UE monitors or receives a control signal within a channel occupancy, wherein the control signal indicates a number of consecutive TTIs (Transmission Time Intervals) and TTI format(s) related information of the TTIs. The method further includes the UE derives transmission direction of symbols in the TTIs or functionality of symbols in the TTIs from the information. The method also includes the UE considers the last TTI of the indicated TTIs as an ending TTI of the channel occupancy. In addition, the method includes the UE performs DL (Downlink) data reception or UL (Uplink) data transmission until the ending TTI.
說明書
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If the UE is scheduled to transmit without gaps in subframes n0, n1, . . . , nw-1 using one or more PDCCH DCI Format 0A/0B/4A/4B, and if the UE has stopped transmitting during or before subframe nk1, k1∈{0, 1, . . . w?2}, and if the channel is sensed by the UE to be continuously idle after the UE has stopped transmitting, the UE may transmit in a later subframe nk2, k2∈{1, . . . w?1} using Type 2 channel access procedure. If the channel sensed by the UE is not continuously idle after the UE has stopped transmitting, the UE may transmit in a later subframe nk2, k2∈{1, . . . w?1} using Type 1 channel access procedure with the UL channel access priority class indicated in the DCI corresponding to subframe nk2.
If the UE receives an UL grant and the DCI indicates a PUSCH transmission starting in subframe n using Type 1 channel access procedure, and if the UE has an ongoing Type 1 channel access procedure before subframe n.
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- if the UL channel access priority class value p1 used for the ongoing Type 1 channel access procedure is same or larger than the UL channel access priority class value p2 indicated in the DCI, the UE may transmit the PUSCH transmission in response to the UL grant by accessing the carrier by using the ongoing Type 1 channel access procedure.
- if the UL channel access priority class value p1 used for the ongoing Type 1 channel access procedure is smaller than the UL channel access priority class value p2 indicated in the DCI, the UE shall terminate the ongoing channel access procedure.
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