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(shuō)明書
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15.1 Downlink Channel Access Procedures
An eNB operating LAA Scell(s) shall perform the channel access procedures described in this sub clause for accessing the channel(s) on which the LAA Scell(s) transmission(s) are performed.
15.1.1 Channel Access Procedure for Transmission(s) Including PDSCH/PDCCH/EPDCCH
The eNB may transmit a transmission including PDSCH/PDCCH/EPDCCH on a carrier on which LAA Scell(s) transmission(s) are performed, after first sensing the channel to be idle during the slot durations of a defer duration Td; and after the counter N is zero in step 4. The counter N is adjusted by sensing the channel for additional slot duration(s) according to the steps below:
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- 1) set N=Ninit, where Ninit is a random number uniformly distributed between 0 and CWp, and go to step 4;
- 2) if N>0 and the eNB chooses to decrement the counter, set N=N?1;
- 3) sense the channel for an additional slot duration, and if the additional slot duration is idle, go to step 4; else, go to step 5;
- 4) if N=0, stop; else, go to step 2.
- 5) sense the channel until either a busy slot is detected within an additional defer duration Td or all the slots of the additional defer duration Td are detected to be idle;
- 6) if the channel is sensed to be idle during all the slot durations of the additional defer duration Td, go to step 4; else, go to step 5;
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