Technique for device-to-device communication based on radio signals received from one or more radio sources
A technique for transmitting and receiving data in a radio communication from a second radio device to a first radio device is described. As to a method aspect of the technique, one or more radio resources are determined based on radio signals received at the first radio device. The one or more radio resources comprise at least one spatial stream among different spatial streams receivable at the first radio device. A status message indicative of the one or more determined radio resources is transmitted to the second radio device. The data from the second radio device is received at the first radio device on at least one radio resource depending on the one or more radio resources indicated in the transmitted status message.
1. A method of operating a second radio device configured to communicate radio communication with a first radio device via a sidelink communications network, the method comprising:
receiving, from the first radio device, a first status message that includes an indication of preferred time-frequency radio resources that form a first set of time-frequency radio resources;
determining a second set of time-frequency radio resources based on radio signals received at the second radio device; and
selecting at least one time-frequency radio resource within an intersection of the first set of time-frequency radio resources and the second set of time-frequency radio resources to be used to communicate data with the first radio device.
2. The method of claim 1 , further comprising:
transmitting the data to the first radio device using the at least one time-frequency radio resource.
3. The method of claim 1 , wherein selecting the at least one time-frequency radio resource comprises selecting the at least one time-frequency radio resource in response to a time gap between the reception of the first status message and the data transmission is less than a predefined threshold value.
4. The method of claim 1 , wherein receiving the first status message further comprises receiving at least one of:
an indication of one or more time-frequency radio resources preferred for the data transmission if a received power measured on the preferred time-frequency radio resources is less than a first predefined threshold value;
an indication of one or more time-frequency radio resources less preferred or excluded for the data transmission; and
an indication of one or more time-frequency radio resources less preferred or excluded for the data transmission if a received power measured on the one or more less preferred or excluded time-frequency radio resources is greater than a second predefined threshold value.
5. The method of claim 1 , further comprising:
transmitting a second status message including an indication of the second set of time-frequency radio resources to the first radio device.
6. The method of claim 5 , wherein transmitting the second status message comprises transmitting an indication of time-frequency radio resources and/or parameters to be used for a data transmission from the first radio device to the second radio device.
7. The method of claim 1 , wherein the preferred time-frequency radio resources are based on radio signals received at the first radio device, the radio signals received at the first radio device including radio signals from a radio source other than the second radio device.
8. The method of claim 1 , wherein the radio signals received at the second radio device include radio signals received from a radio source other than the first radio device.
9. The method of claim 1 , wherein the second set of time-frequency radio resources is based on a sensing procedure performed at the second radio device.
10. The method of claim 1 , wherein receiving the first status message comprises receiving the first status message on a Physical Sidelink Control Channel (“PSCCH”) and/or using Sidelink Control Information(“SCI”) that includes at least a one bit field indicative of the one or more time-frequency radio resources.
11. The method of claim 1 , wherein receiving the first status message comprises receiving the first status message periodically.
12. The method of claim 1 , wherein receiving the first status message comprises receiving the first status message in at least one of:
a unicast mode;
a multicast mode; and
a broadcast mode, and
wherein receiving the first status message comprises receiving the first status message on one or more of:
a Physical Layer (“PHY”);
a Medium Access Control (“MAC”) layer;
a Radio Link Control (“RLC”) layer; and
a Radio Resource Control (“RRC”) layer.
13. The method of claim 1 , wherein receiving the first status message comprises receiving the first status message upon request.
14. A second radio device configured to communicate radio communication with a first radio device via a sidelink communications network, the second radio device comprising
processing circuitry; and
memory coupled to the processing circuitry and having instructions stored therein that are executable by the processing circuitry to cause the second radio device to perform operations comprising:
receiving, from the first radio device, a first status message that includes an indication of preferred time-frequency radio resources that form a first set of time-frequency radio resources;
determining a second set of time-frequency radio resources based on radio signals received at the second radio device; and
selecting at least one time-frequency radio resource within an intersection of the first set of time-frequency radio resources and the second set of time-frequency radio resources to be used to communicate data with the first radio device.
15. The second radio device of claim 14 , the operations further comprising:
transmitting the data to the first radio device using the at least one time-frequency radio resource.
16. The second radio device of claim 14 , wherein receiving the first status message further comprises receiving at least one of:
an indication of one or more time-frequency radio resources preferred for the data transmission if a received power measured on the preferred time-frequency radio resources is less than a first predefined threshold value;
an indication of one or more time-frequency radio resources less preferred or excluded for the data transmission; and
an indication of one or more time-frequency radio resources less preferred or excluded for the data transmission if a received power measured on the one or more less preferred or excluded time-frequency radio resources is greater than a second predefined threshold value.
17. The second radio device of claim 14 , the operations further comprising:
transmitting a second status message including an indication of the second set of time-frequency radio resources to the first radio device,
wherein transmitting the second status message comprises transmitting an indication of time-frequency radio resources and/or parameters to be used for a data transmission from the first radio device to the second radio device.
18. The second radio device of claim 14 , wherein the preferred time-frequency radio resources are based on radio signals received at the first radio device, the radio signals received at the first radio device including radio signals from a radio source other than the second radio device.
19. The second radio device of claim 14 , wherein the radio signals received at the second radio device include radio signals received from a radio source other than the first radio device.
20. The second radio device of claim 14 , wherein the second set of time-frequency radio resources is based on a sensing procedure performed at the second radio device.
21. The second radio device of claim 14 , wherein receiving the first status message comprises receiving the first status message on a Physical Sidelink Control Channel (“PSCCH”) and/or using Sidelink Control Information(“SCI”) that includes at least a one bit field indicative of the one or more time-frequency radio resources.
22. The second radio device of claim 14 , wherein receiving the first status message comprises receiving the first status message periodically.
23. The second radio device of claim 14 , wherein receiving the first status message comprises receiving the first status message in at least one of:
a unicast mode;
a multicast mode; and
a broadcast mode.
24. The second radio device of claim 14 , wherein receiving the first status message comprises receiving the first status message on one or more of:
a Physical Layer (“PHY”);
a Medium Access Control (“MAC”) layer;
a Radio Link Control (“RLC”) layer; and
a Radio Resource Control (“RRC”) layer.
25. The second radio device of claim 14 , wherein receiving the first status message comprises receiving the first status message upon request.
26. A non-transitory computer-readable medium having instructions stored therein that are executable by processing circuitry of a second radio device configured to communicate radio communication with a first radio device via a sidelink communications network to cause the second radio device to perform operations comprising:
receiving, from the first radio device, a first status message that includes an indication of preferred time-frequency radio resources that form a first set of time-frequency radio resources;
determining a second set of time-frequency radio resources based on radio signals received at the second radio device; and
selecting at least one time-frequency radio resource within an intersection of the first set of time-frequency radio resources and the second set of time-frequency radio resources to be used to communicate data with the first radio device.