Device and method for wireless channel access
The disclosure provides a method for wireless channel access, through which transmitter of a latency-critical communication is allowed to access the channel as soon as possible. Service-based energy detection thresholds and service-based channel access priority class may be used in listen-before-talk (LBT) operations for the latency-critical communication. When an unlicensed band is obtained for non-latency-critical service, a subset of radio resources in the unlicensed band is reserved for the latency-critical communication to bypassing an LBT operation. The method may be used to reduce latency for ultra reliable low latency communication (URLLC) transmission.
1. A method for wireless channel access, executable by a device, comprising:
determining a wireless communication service to be performed through a contention-based random access operation;
selecting a service-based energy detection threshold associated with the wireless communication service; and
using the selected service-based energy detection threshold to perform energy detection in the contention-based random access operation to obtain an unlicensed band for the wireless communication service;
wherein the contention-based random access operation is a listen-before-talk operation;
wherein the selecting further comprises:
selecting a first prioritized energy detection threshold associated with latency-critical communication service as the selected service-based energy detection threshold for transmission of latency-critical communication traffic; and
selecting a second prioritized energy detection threshold associated with non-latency-critical communication service as the selected service-based energy detection threshold for transmission of non-latency-critical communication traffic;
further comprising:
associating a dedicated priority class with a latency-critical communication service;
wherein the dedicated priority class comprises a channel access priority class (CAPC);
further comprising:
determining a minimum time T LBTmin for performing the listen-before-talk operation;
wherein the minimum time T LBTmin for performing the listen-before-talk operation is derived from a plurality of parameters including the CAPC.
2. The method of claim 1 , wherein the listen-before-talk operation is used to access a new radio unlicensed band.
3. The method of claim 1 , wherein minimum time T LBTmin for performing the listen-before-talk operation is derived according to the formula:
T LBTmin =T f +( m p +N )· T sl
wherein T f is a constant duration, T sl is a sensing slot duration, the m p is a number of consecutive sensing slots according to the CAPC, and N is a counter for counting slots for sensing channel energy.
4. The method of claim 3 , wherein a domain of the CAPC comprises more than four CAPCs.
5. The method of claim 1 , wherein the latency-critical communication service comprises ultra reliable low latency communication (URLLC).
6. The method of claim 5 , wherein the service-based energy detection threshold is selected by the device serving as a transmitter.
7. The method of claim 5 , wherein the service-based energy detection threshold is explicitly indicated by radio resource control (RRC) signaling.
8. A device, comprising:
a transceiver; and
a processor connected with the transceiver and configured to execute the following steps comprising:
determining a wireless communication service to be performed through a contention-based random access operation;
selecting a service-based energy detection threshold associated with the wireless communication service; and
using the selected service-based energy detection threshold to perform energy detection in the contention-based random access operation to obtain an unlicensed band for the wireless communication service;
wherein the contention-based random access operation is a listen-before-talk operation;
wherein the selecting further comprises:
selecting a first prioritized energy detection threshold associated with latency-critical communication service as the selected service-based energy detection threshold for transmission of latency-critical communication traffic; and
selecting a second prioritized energy detection threshold associated with non-latency-critical communication service as the selected service-based energy detection threshold for transmission of non-latency-critical communication traffic;
wherein the processor is further configured to execute the step of:
associating a dedicated priority class with a latency-critical communication service;
wherein the dedicated priority class comprises a channel access priority class (CAPC);
wherein the processor is further configured to execute the step of:
determining a minimum time T LBTmin for performing the listen-before-talk operation;
wherein the minimum time T LBTmin for performing the listen-before-talk operation is derived from a plurality of parameters including the CAPC.
9. The device of claim 8 , wherein the listen-before-talk operation is used to access a new radio unlicensed band.
10. A chip, comprising:
a processor, configured to call and run a computer program stored in a memory, to cause a device in which the chip is installed to execute the method of claim 1 .