Adaptive NR unlicensed spectrum sharing and transmission mechanism for different channel access priorities
Methods and apparatuses are described herein for spectrum sharing and transmission mechanisms for different channel access priorities. For example, a wireless transmit/receive unit (WTRU) may be configured as either a high priority (HP) WTRU or a low priority (LP) WTRU, wherein a HP WTRU is configured to use a first channel access method for accessing the set of network resources and a LP WTRU is configured to use a second channel access method for accessing the same set of network resources, the second channel access method having a lower priority than the first channel access method. A set of protected network resources may be scheduled within the set of network resources for being accessed by the LP unit (e.g., over a limited period of time) with fewer channel access restrictions (e.g., with a higher priority channel access method than in any unprotected network resources).
1. A method for use in a wireless transmit/receive unit (WTRU), the method comprising:
receiving first configuration information indicating a first channel access method associated with a first priority to be used during at least a first duration;
receiving second configuration information indicating a second channel access method associated with a second priority to be used during a plurality of second durations, the second priority being of higher priority than the first priority;
monitoring for a pre-emption signal in one second duration of the plurality of second durations; and
on a condition that the pre-emption signal is received in the monitored second duration, accessing a channel in the monitored second duration using a third channel access method associated with a third priority, in accordance with the pre-emption signal, the third priority being of a lower priority than the second priority.
2. The method according to claim 1 , wherein said second configuration information indicates that:
(1) a set of resources is associated with the second channel access method; and
(2) the set of resources is scheduled in the monitored second duration.
3. The method according to claim 2 , wherein said second configuration information is received in a broadcast transmission from at least one gNB of higher priority than a serving of gNB of the WTRU.
4. The method according to claim 2 , wherein the pre-emption signal comprises information indicating any of pre-empted resources in the set of resources, a pre-emption duration and a channel access method to be used on the pre-empted resources.
5. The method according to claim 1 , further comprising aborting a current transmission in the monitored second duration after receiving the pre-emption signal.
6. The method according to claim 5 , wherein accessing the channel in the monitored second duration using the third channel access method associated with the third priority is for resuming the aborted transmission.
7. The method according to claim 5 , wherein the channel is accessed in a subsequent occurrence of the plurality of second durations using the second channel access method.
8. The method according to claim 1 , wherein:
the first channel access method comprises transmitting after a first listen before talk (LBT) operation of a first type associated with the first priority;
the second channel access method comprises transmitting after a second LBT operation of a second type associated with the second priority or transmitting without a LBT operation associated with said transmitting; and
the third channel access method comprises transmitting after a third LBT operation of a third type associated with the third priority.
9. The method according to claim 8 , wherein any of the first and the third types of LBT correspond to a full LBT.
10. The method according to claim 1 , wherein the first and the third channel access methods are a same channel access method, and the first priority is a same priority as the third priority.
11. A wireless transmit/receive unit (WTRU) comprising a processor and a transceiver operatively coupled to the processor, the processor being configured to:
receive first configuration information indicating a first channel access method associated with a first priority to be used during at least a first duration;
receive second configuration information indicating a second channel access method associated with a second priority to be used during a plurality of second durations, the second priority being of higher priority than the first priority;
monitor for a pre-emption signal in one second duration of the plurality of second durations; and
on a condition that the pre-emption signal is received in the monitored second duration, access a channel in the monitored second duration using a third channel access method associated with a third priority, in accordance with the pre-emption signal, the third priority being of a lower priority than the second priority.
12. The WTRU according to claim 11 , wherein said second configuration information indicates that:
(1) a set of resources is associated with the second channel access method; and
(2) the set of resources is scheduled in the monitored second duration.
13. The WTRU of claim 12 , wherein said second configuration information is received in a broadcast transmission from at least one gNB of higher priority than a serving gNB of the WTRU.
14. The WTRU according to claim 12 , wherein the pre-emption signal comprises information indicating any of pre-empted resources in the set of resources, a pre-emption duration and a channel access method to be used on the pre-empted resources.
15. The WTRU according to claim 11 , wherein a current transmission is aborted in the monitored second duration after receiving the pre-emption signal.
16. The WTRU according to claim 15 , wherein the channel is accessed in the monitored second duration using the third channel access method associated with the third priority for resuming the aborted transmission.
17. The WTRU according to claim 11 , wherein the channel is accessed in a subsequent occurrence of the plurality second durations using the second channel access method.
18. The WTRU according to claim 11 , wherein:
the first channel access method comprises a transmission after a first listen before talk (LBT) operation of a first type associated with the first priority;
the second channel access method comprises a transmission after a second LBT operation of a second type associated with the second priority or transmitting without a LBT operation associated with said transmitting; and
the third channel access method comprises a transmission after a third LBT operation of a third type associated with the third priority.
19. The WTRU according to claim 18 , wherein any of the first and the third types of LBT correspond to a full LBT.
20. The WTRU according to claim 11 , wherein the first and the third channel access methods are a same channel access method, and the first priority is a same priority as a third priority.