Interference measurement for sidelink communication
Aspects relate to measuring interference associated with sidelink communication. A UE that supports full-duplex communication may transmit on a first frequency resource and conduct self-interference measurements on a second frequency resource (e.g., a guard band) adjacent to the first frequency resource. Provisions may be made to ensure that other nearby wireless communication devices do not transmit on the second set of frequency resources when the UE is conducting an interference measurement. In a first resource allocation mode, a base station that allocates full-duplex resources for a first UE may ensure that any UEs that are near the first UE are not scheduled to transmit on a guard band when the UE is conducting an interference measurement. In a second resource allocation mode, a UE may reserve resources that are predefined with a guard band or the UE may reserve resources and use a subset of the resources for interference measurements.
1. A method for wireless communication at a first user equipment, the method comprising:
transmitting a request for resources for a self-interference measurement to a base station, the request comprising guard band information for the self-interference measurement;
receiving scheduling information from the base station, wherein the scheduling information indicates that a first set of resources of a plurality of sidelink resources is allocated for the first user equipment for full-duplex communication, and wherein the scheduling information further indicates that a guard band based on the guard band information is to be used by the first user equipment for the self-interference measurement;
measuring self-interference on the guard band while transmitting a signal on a first frequency resource of the first set of resources; and
transmitting an indication of the self-interference to the base station.
2. The method of claim 1 , further comprising:
determining the guard band information to be used for the self-interference measurement.
3. The method of claim 2 , wherein the guard band information comprises:
a guard band size; or
a plurality of guard band sizes to be used for different transmit power levels.
4. The method of claim 1 , further comprising:
receiving at least one indication comprising a request for the first user equipment to measure the self-interference,
wherein the measuring the self-interference on the guard band is triggered by the at least one indication.
5. The method of claim 4 , wherein the scheduling information comprises a grant that includes the at least one indication.
6. The method of claim 5 , wherein the grant comprises at least one of:
an indication of a resource to be used by the first user equipment to report the self-interference,
an attribute of a self-interference measurement report,
a transmit power level to be used for the self-interference measurement report,
a quantity of resources to be monitored for the self-interference,
or a combination thereof.
7. The method of claim 1 , wherein the first set of resources comprises semi-persistent resources to be used for the self-interference measurement.
8. The method of claim 1 ,
wherein the scheduling information is received as a result of the transmitting of the request.
9. The method of claim 1 , wherein the first frequency resource of the first set of resources is allocated for the first user equipment to conduct a data transmission.
10. The method of claim 1 , wherein:
the transmitting the signal on the first frequency resource comprises transmitting a protocol data unit to a second user equipment;
the protocol data unit does not include data for the second user equipment; and
the method further comprises transmitting, to the second user equipment via a sidelink channel, an indication that the first set of resources is to be used for the self-interference measurement.
11. The method of claim 1 , wherein:
the first set of resources comprises a first set of symbols of a slot allocated for the self-interference measurement; and
the measuring the self-interference on the guard band comprises transmitting a reference signal during the first set of symbols.
12. A first user equipment, comprising:
a transceiver;
a memory; and
at least one processor communicatively coupled to the transceiver and the memory, wherein the at least one processor is individually or collectively configured to:
transmit a request for resources for a self-interference measurement to a base station, the request comprising guard band information for the self-interference measurement;
receive scheduling information from the base station, wherein the scheduling information indicates that a first set of resources of a plurality of sidelink resources is allocated for the first user equipment for full-duplex communication, and wherein the scheduling information further indicates that a guard band based on the guard band information is to be used by the first user equipment for the self-interference measurement;
measure self-interference on the guard band while a signal is transmitted on a first frequency resource of the first set of resources via the transceiver; and
transmit an indication of the self-interference to the base station.
13. The first user equipment of claim 12 , wherein the at least one processor is further individually or collectively configured to:
determine the guard band information to be used for the self-interference measurement.
14. A method for wireless communication at a first user equipment, the method comprising:
identifying a first set of resources of a plurality of sidelink resources to be used by the first user equipment for full-duplex communication;
identifying a guard band of the first set of resources to be used by the first user equipment for a self-interference measurement;
transmitting, to a second user equipment, an indication that the first user equipment is reserving the guard band for the self-interference measurement and a first frequency resource of the first set of resources for a transmission; and
measuring self-interference on the guard band while transmitting a signal on the first frequency resource of the first set of resources.
15. The method of claim 14 , wherein:
the identifying the first set of resources comprises determining that the first set of resources are reserved for the self-interference measurement.
16. The method of claim 15 , further comprising:
sensing signal energy on the first set of resources; and
transmitting the indication on a sidelink channel to reserve the first set of resources after the sensing the signal energy.
17. The method of claim 15 , wherein:
the first set of resources comprises a first set of resource blocks and a second set of resource blocks; and
the guard band comprises at least one frequency gap between the first set of resource blocks and the second set of resource blocks.
18. The method of claim 14 , further comprising:
reserving the first set of resources,
wherein the identifying the guard band comprises selecting a first subset of the first set of resources to be used for the self-interference measurement.
19. The method of claim 18 , further comprising:
selecting a second subset of the first set of resources to be used for the first user equipment for the transmitting the signal, wherein the second subset is different from the first subset.
20. The method of claim 14 , wherein:
the transmitting the signal on the first frequency resource comprises transmitting a protocol data unit to the second user equipment; and
the protocol data unit does not include data for the second user equipment.
21. The method of claim 14 , wherein:
the first set of resources comprises a first set of symbols of a slot allocated for the self-interference measurement; and
the measuring the self-interference on the guard band comprises transmitting a reference signal during the first set of symbols.
22. The method of claim 14 ,
wherein the indication indicates that a first set of subchannels of the first set of resources is reserved for a data transmission and that a second set of subchannels of the first set of resources is reserved for at least one interference measurement.
23. The method of claim 22 , wherein the indication specifies resources for a single interference measurement or a plurality of interference measurements.
24. The method of claim 22 , wherein the indication specifies a quantity of the second set of subchannels and a location of the second set of subchannels.
25. The method of claim 22 , wherein:
a location of the second set of subchannels is specified by a configuration; and
the indication specifies a quantity of the second set of subchannels.
26. The method of claim 22 , wherein:
a location of the second set of subchannels and a quantity of the second set of subchannels are specified by a configuration; and
the indication comprises a bit that specifies whether the second set of subchannels are to be used for the at least one interference measurement.
27. A first user equipment, comprising:
a transceiver;
a memory; and
at least one processor communicatively coupled to the transceiver and the memory, wherein the at least one processor is individually or collectively configured to:
identify a first set of resources of a plurality of sidelink resources to be used by the first user equipment for sub-band full-duplex communication;
identify a guard band of the first set of resources to be used by the first user equipment for a self-interference measurement;
transmit, to a second user equipment, an indication of a reservation by the first user equipment of the guard band for the self-interference measurement and a first frequency resource of the first set of resources for a transmission; and; and
measure self-interference on the guard band while transmitting a signal on the first frequency resource of the first set of resources via the transceiver.