Protocol for device-to-device positioning
A method, an apparatus, and a computer program product for wireless communication are provided. The apparatus determines a position of the apparatus. The apparatus broadcasts information in a first subset of a set of resources. The information includes the position of the apparatus, a sequence ID, and a resource ID associated with a second subset of the set of resources. The apparatus broadcasts a sequence in at least one symbol of the second subset of the set of resources. The at least one symbol is identified by the resource ID and the sequence is identified by the sequence ID.
1. A method of wireless communication by a user equipment (UE), comprising:
receiving a first set of information in a first subset of a set of resources from a plurality of UEs, the first set of information comprising, for each UE in the plurality of UEs, a position of said each UE, a sequence identifier (ID), and a resource ID;
receiving a set of sequences in symbols of a second subset of the set of resources from the plurality of UEs, wherein each sequence in the set of sequences is associated with the respective sequence ID and is received on at least one symbol of the symbols, the at least one symbol being identified by the respective resource ID;
determining timing information associated with the received set of sequences; and
broadcasting a second set of information in a third subset of the set of resources, the second set of information comprising the determined timing information, a position associated with the UE, and identifiers of the plurality of UEs.
2. The method of claim 1 , wherein the set of sequences include Zadoff Chu sequences, and the respective sequence ID comprises a root index and a cyclic shift associated with a Zadoff Chu sequence.
3. The method of claim 1 , wherein each sequence of the set of sequences occupies an entire bandwidth of the at least one symbol.
4. The method of claim 1 , further comprising receiving a message from a base station that indicates the first, second, and third subsets of the set of resources.
5. The method of claim 1 , further comprising determining at least one resource for broadcasting the second set of information in the third subset of the set of resources.
6. The method of claim 5 , wherein the determination is based on a random selection or an energy-based detection.
7. The method of claim 5 , further comprising receiving a message from a base station that indicates the at least one resource for broadcasting the second set of information, wherein the determination of the at least one resource is based on the received message.
8. An apparatus for wireless communication, the apparatus being a user equipment (UE) and comprising:
a memory; and
at least one processor coupled to the memory and configured to:
receive a first set of information in a first subset of a set of resources from a plurality of UEs, the first set of information comprising, for each UE in the plurality of UEs, a position of said each UE, a sequence identifier (ID), and a resource ID;
receive a set of sequences in symbols of a second subset of the set of resources from the plurality of UEs, wherein each sequence in the set of sequences is associated with the respective sequence ID and is received on at least one symbol of the symbols, the at least one symbol being identified by the respective resource ID;
determine timing information associated with the received set of sequences; and
broadcast a second set of information in a third subset of the set of resources, the second set of information comprising the determined timing information, a position associated with the UE, and identifiers of the plurality of UEs.
9. The apparatus of claim 8 , wherein the set of sequences include Zadoff Chu sequences, and the respective sequence ID comprises a root index and a cyclic shift associated with a Zadoff Chu sequence.
10. The apparatus of claim 8 , wherein each sequence of the set of sequences occupies an entire bandwidth of the at least one symbol.
11. The apparatus of claim 8 , wherein the at least one processor is further configured to receive a message from a base station that indicates the first, second, and third subsets of the set of resources.
12. The apparatus of claim 8 , wherein the at least one processor is further configured to determine at least one resource for broadcasting the second set of information in the third subset of the set of resources.
13. The apparatus of claim 12 , wherein the determination is based on a random selection or an energy-based detection.
14. The apparatus of claim 12 , wherein the at least one processor is further configured to receive a message from a base station that indicates the at least one resource for broadcasting the second set of information, wherein the determination of the at least one resource is based on the received message.
15. An apparatus for wireless communication, the apparatus being a user equipment (UE) and comprising:
means for receiving a first set of information in a first subset of a set of resources from a plurality of UEs, the first set of information comprising, for each UE in the plurality of UEs, a position of said each UE, a sequence identifier (ID), and a resource ID;
means for receiving a set of sequences in symbols of a second subset of the set of resources from the plurality of UEs, wherein each sequence in the set of sequences is associated with the respective sequence ID and is received on at least one symbol of the symbols, the at least one symbol being identified by the respective resource ID;
means for determining timing information associated with the received set of sequences; and
means for broadcasting a second set of information in a third subset of the set of resources, the second set of information comprising the determined timing information, a position associated with the UE, and identifiers of the plurality of UEs.
16. The apparatus of claim 15 , wherein the set of sequences include Zadoff Chu sequences, and the respective sequence ID comprises a root index and a cyclic shift associated with a Zadoff Chu sequence.
17. The apparatus of claim 15 , wherein each sequence of the set of sequences occupies an entire bandwidth of the at least one symbol.
18. The apparatus of claim 15 , further comprising means for receiving a message from a base station that indicates the first, second, and third subsets of the set of resources.
19. The apparatus of claim 15 , further comprising means for determining at least one resource for broadcasting the second set of information in the third subset of the set of resources.
20. The apparatus of claim 19 , wherein the determination is based on a random selection or an energy-based detection.
21. The apparatus of claim 19 , further comprising means for receiving a message from a base station that indicates the at least one resource for broadcasting the second set of information, wherein the determination of the at least one resource is based on the received message.
22. A non-transitory computer-readable medium storing computer executable code, the computer executable code having instructions for:
receiving a first set of information in a first subset of a set of resources from a plurality of UEs, the first set of information comprising, for each UE in the plurality of UEs, a position of said each UE, a sequence identifier (ID), and a resource ID;
receiving a set of sequences in symbols of a second subset of the set of resources from the plurality of UEs, wherein each sequence in the set of sequences is associated with the respective sequence ID and is received on at least one symbol of the symbols, the at least one symbol being identified by the respective resource ID;
determining timing information associated with the received set of sequences; and
broadcasting a second set of information in a third subset of the set of resources, the second set of information comprising the determined timing information, a position associated with the UE, and identifiers of the plurality of UEs.
23. The non-transitory computer-readable medium of claim 22 , wherein the set of sequences include Zadoff Chu sequences, and the respective sequence ID comprises a root index and a cyclic shift associated with a Zadoff Chu sequence.
24. The non-transitory computer-readable medium of claim 22 , wherein each sequence of the set of sequences occupies an entire bandwidth of the at least one symbol.
25. The non-transitory computer-readable medium of claim 22 , further comprising instructions for receiving a message from a base station that indicates the first, second, and third subsets of the set of resources.
26. The non-transitory computer-readable medium of claim 22 , further comprising instructions for determining at least one resource for broadcasting the second set of information in the third subset of the set of resources.
27. The non-transitory computer-readable medium of claim 26 , wherein the determination is based on a random selection or an energy-based detection.
28. The non-transitory computer-readable medium of claim 26 , further comprising instructions for receiving a message from a base station that indicates the at least one resource for broadcasting the second set of information, wherein the determination of the at least one resource is based on the received message.