Transmission and reception of proximity detection signal for peer discovery
Techniques for performing peer discovery to enable peer-to-peer (P2P) communication are disclosed. In an aspect, a proximity detection signal used for peer discovery may be generated based on one or more physical channels and/or signals used in a wireless network. In one design, a user equipment (UE) may generate a proximity detection signal occupying at least one resource block based on a SC-FDMA modulation technique. In another design, the UE may generate a proximity detection signal occupying at least one resource block based on an OFDMA modulation technique. The UE may generate SC-FDMA symbols or OFDMA symbols in different manners for different physical channels. In yet another design, the UE may generate a proximity detection signal including a primary synchronization signal and a secondary synchronization signal. For all designs, the UE may transmit the proximity detection signal to indicate its presence and to enable other UEs to detect the UE.
1. A method for wireless communication, comprising:
generating a peer discovery proximity detection signal that includes a proximity detection reference signal and a proximity detection data signal, the peer discovery proximity detection signal containing information associated with a user equipment (UE) and occupying at least one resource block based on a single-carrier frequency division multiple access (SC-FDMA) modulation technique, each resource block covering a set of subcarriers in a plurality of symbol periods,
wherein the generating the peer discovery proximity detection signal comprises:
generating the proximity detection reference signal, which enables peer discovery of the UE, for at least one symbol period in each of the at least one resource block, and
generating the proximity detection data signal, which enables peer discovery of the UE, for at least one remaining symbol period in said each of the at least one resource block; and
transmitting the peer discovery proximity detection signal, which includes the proximity detection reference signal and the proximity detection data signal, by the UE to indicate presence of the UE.
2. The method of claim 1 , wherein the generating the peer discovery proximity detection signal comprises generating the peer discovery proximity detection signal occupying two resource blocks in two slots based on the SC-FDMA modulation technique.
3. The method of claim 2 , wherein the two resource blocks cover different sets of subcarriers with frequency hopping.
4. The method of claim 1 , wherein the generating the proximity detection reference signal comprises generating the proximity detection reference signal based on one of a set of reference signal sequences reserved for proximity detection signals transmitted by UEs.
5. The method of claim 1 , wherein the generating the proximity detection data signal comprises:
encoding data to be sent in the peer discovery proximity detection signal based on a coding scheme,
mapping the encoded data to modulation symbols based on a modulation scheme, and
generating at least one SC-FDMA symbol for the at least one remaining symbol period based on the modulation symbols.
6. The method of claim 5 , wherein the generating the proximity detection data signal further comprises:
selecting a modulation and coding scheme in a set of modulation and coding schemes supported for data transmission, and
determining the coding scheme and the modulation scheme based on the selected modulation and coding scheme.
7. The method of claim 1 , wherein the transmitting the peer discovery proximity detection signal comprises transmitting the peer discovery proximity detection signal on an uplink spectrum.
8. The method of claim 1 , wherein the transmitting the peer discovery proximity detection signal comprises transmitting the peer discovery proximity detection signal via a single antenna port.
9. The method of claim 1 , further comprising:
selecting the at least one resource block from among a plurality of resource blocks reserved for transmission of peer discovery proximity detection signals by UEs.
10. The method of claim 9 , wherein at least two neighboring base stations are allocated different pluralities of resource blocks for transmission of peer discovery proximity detection signals by UEs within coverage of the base stations.
11. The method of claim 1 , wherein the generating the peer discovery proximity detection signal comprises generating the peer discovery proximity detection signal for transmission on a Physical Uplink Shared Channel (PUSCH) or a Physical Uplink Control Channel (PUCCH).
12. The method of claim 1 , wherein the information associated with the UE includes one or more of a UE identity, service information indicative of a service requested by the UE, service information indicative of a service offered by the UE, and UE location information.
13. The method of claim 1 , further comprising reserving, by the UE, the at least one resource block for transmitting the peer discovery proximity detection signal.
14. An apparatus for wireless communication, comprising:
means for generating a peer discovery proximity detection signal that includes a proximity detection reference signal and a proximity detection data signal, the peer discovery proximity detection signal containing information associated with a user equipment (UE) and occupying at least one resource block based on a single-carrier frequency division multiple access (SC-FDMA) modulation technique, each resource block covering a set of subcarriers in a plurality of symbol periods,
wherein the means for generating the peer discovery proximity detection signal is configured to:
generate the proximity detection reference signal, which enables peer discovery of the UE, for at least one symbol period in each of the at least one resource block, and
generate the proximity detection data signal, which enables peer discovery of the UE, for at least one remaining symbol period in said each of the at least one resource block; and
means for transmitting the peer discovery proximity detection signal, which includes the proximity detection reference signal and the proximity detection data signal, by the UE to indicate presence of the UE.
15. The apparatus of claim 14 , further comprising:
means for selecting the at least one resource block from among a plurality of resource blocks reserved for transmission of peer discovery proximity detection signals by UEs.
16. The apparatus of claim 14 , wherein the means for generating the peer discovery proximity detection signal is configured to generate the peer discovery proximity detection signal for transmission on a Physical Uplink Shared Channel (PUSCH) or a Physical Uplink Control Channel (PUCCH).
17. An apparatus for wireless communication, comprising:
a memory; and
at least one processor coupled to the memory and configured to:
generate a peer discovery proximity detection signal that includes a proximity detection reference signal and a proximity detection data signal, the peer discovery proximity detection signal containing information associated with a user equipment (UE) and occupying at least one resource block based on a single-carrier frequency division multiple access (SC-FDMA) modulation technique, each resource block covering a set of subcarriers in a plurality of symbol periods, and to transmit the peer discovery proximity detection signal, which includes the proximity detection reference signal and the proximity detection data signal, by the UE to indicate presence of the UE,
wherein the at least one processor is configured to generate the proximity detection reference signal, which enables peer discovery of the UE, for at least one symbol period in each of the at least one resource block, and to generate the proximity detection data signal, which enables peer discovery of the UE, for at least one remaining symbol period in said each of the at least one resource block.
18. The apparatus of claim 17 , wherein the at least one processor is configured to select the at least one resource block from among a plurality of resource blocks reserved for transmission of peer discovery proximity detection signals by UEs.
19. The apparatus of claim 17 , wherein the at least one processor is configured to generate the peer discovery proximity detection signal for transmission on a Physical Uplink Shared Channel (PUSCH) or a Physical Uplink Control Channel (PUCCH).
20. A non-transitory computer-readable medium storing computer executable code for wireless communication, comprising code for:
generating a peer discovery proximity detection signal that includes a proximity detection reference signal and a proximity detection data signal, the peer discovery proximity detection signal containing information associated with a user equipment (UE) and occupying at least one resource block based on a single-carrier frequency division multiple access (SC-FDMA) modulation technique, each resource block covering a set of subcarriers in a plurality of symbol periods,
wherein the code for generating the peer discovery proximity detection signal comprises code for:
generating the proximity detection reference signal, which enables peer discovery of the UE, for at least one symbol period in each of the at least one resource block, and
generating the proximity detection data signal, which enables peer discovery of the UE, for at least one remaining symbol period in said each of the at least one resource block; and
transmitting the peer discovery proximity detection signal, which includes the proximity detection reference signal and the proximity detection data signal, by the UE to indicate presence of the UE.
21. A method for wireless communication, comprising:
generating a peer discovery proximity detection signal that includes a proximity detection reference signal and a proximity detection data signal, the peer discovery proximity detection signal containing information associated with a user equipment (UE) and occupying at least one resource block based on an orthogonal frequency division multiple access (OFDMA) modulation technique, each resource block covering a set of subcarriers in a plurality of symbol periods,
wherein the generating the peer discovery proximity detection signal comprises:
generating the proximity detection reference signal, which enables peer discovery of the UE, occupying a first set of resource elements in the at least one resource block, and
generating the proximity detection data signal, which enables peer discovery of the UE, occupying a second set of resource elements in the at least one resource block; and
transmitting the peer discovery proximity detection signal, which includes the proximity detection reference signal and the proximity detection data signal, by the UE to indicate presence of the UE.
22. The method of claim 21 , wherein the generating the peer discovery proximity detection signal comprises generating the peer discovery proximity detection signal occupying two resource blocks in two slots based on the OFDMA modulation technique.
23. The method of claim 22 , wherein the two resource blocks cover different sets of subcarriers with frequency hopping.
24. The method of claim 21 , wherein each resource block includes a plurality of resource elements, and each resource element covers one subcarrier in one symbol period.
25. The method of claim 24 , wherein the generating the proximity detection reference signal comprises generating the proximity detection reference signal based on one of a set of reference signal sequences reserved for peer discovery proximity detection signals transmitted by UEs.
26. The method of claim 24 , wherein the first set of resource elements comprises first and second subsets of resource elements, the first subset of resource elements occupying a first subset of subcarriers in at least one symbol period, and the second subset of resource elements occupying a second subset of subcarriers in at least one other symbol period, and wherein the generating the proximity detection reference signal comprises:
generating reference symbols based on a reference signal sequence,
mapping a first subset of the reference symbols to the first subset of resource elements, and
mapping a second subset of the reference symbols to the second subset of resource elements.
27. The method of claim 24 , wherein the generating the proximity detection data signal comprises:
encoding data to be sent in the peer discovery proximity detection signal based on a coding scheme,
mapping the encoded data to modulation symbols based on a modulation scheme,
mapping the modulation symbols to the second set of resource elements in the at least one resource block, and
generating a plurality of OFDMA symbols based on the mapped modulation symbols.
28. The method of claim 21 , wherein the transmitting the peer discovery proximity detection signal comprises transmitting the peer discovery proximity detection signal via a designated antenna port.
29. The method of claim 21 , wherein the transmitting the peer discovery proximity detection signal comprises transmitting the peer discovery proximity detection signal on an uplink spectrum.
30. The method of claim 21 , further comprising:
selecting the at least one resource block from among a plurality of resource blocks reserved for transmission of peer discovery proximity detection signals by UEs.
31. The method of claim 21 , wherein the generating the peer discovery proximity detection signal comprises generating the peer discovery proximity detection signal for transmission on a Physical Downlink Shared Channel (PDSCH) or a Physical Downlink Control Channel (PDCCH).
32. An apparatus for wireless communication, comprising:
means for generating a peer discovery proximity detection signal that includes a proximity detection reference signal and a proximity detection data signal, the peer discovery proximity detection signal containing information associated with a user equipment (UE) and occupying at least one resource block based on an orthogonal frequency division multiple access (OFDMA) modulation technique, each resource block covering a set of subcarriers in a plurality of symbol periods,
wherein the means for generating the peer discovery proximity detection signal is configured to:
generate the proximity detection reference signal, which enables peer discovery of the UE, occupying a first set of resource elements in the at least one resource block, and
generate the proximity detection data signal, which enables peer discovery of the UE, occupying a second set of resource elements in the at least one resource block; and
means for transmitting the peer discovery proximity detection signal, which includes the proximity detection reference signal and the proximity detection data signal, by the UE to indicate presence of the UE.
33. The apparatus of claim 32 , wherein each resource block includes a plurality of resource elements, and each resource element covers one subcarrier in one symbol period.
34. The apparatus of claim 32 , further comprising:
means for selecting the at least one resource block from among a plurality of resource blocks reserved for transmission of peer discovery proximity detection signals by UEs.
35. The apparatus of claim 32 , wherein the means for generating the peer discovery proximity detection signal is configured to generate the peer discovery proximity detection signal for transmission on a Physical Downlink Shared Channel (PDSCH) or a Physical Downlink Control Channel (PDCCH).
36. An apparatus for wireless communication, comprising:
a memory; and
at least one processor coupled to the memory and configured to:
generate a peer discovery proximity detection signal that includes a proximity detection reference signal and a proximity detection data signal, the peer discovery proximity detection signal containing information associated with a user equipment (UE) and occupying at least one resource block based on an orthogonal frequency division multiple access (OFDMA) modulation technique, each resource block covering a set of subcarriers in a plurality of symbol periods, and to transmit the peer discovery proximity detection signal, which includes the proximity detection reference signal and the proximity detection data signal, by the UE to indicate presence of the UE,
wherein the at least one processor is configured to generate the proximity detection reference signal, which enables peer discovery of the UE, occupying a first set of resource elements in the at least one resource block, and to generate the proximity detection data signal, which enables peer discovery of the UE, occupying a second set of resource elements in the at least one resource block.
37. The apparatus of claim 36 , wherein each resource block includes a plurality of resource elements, and each resource element covers one subcarrier in one symbol period.
38. The apparatus of claim 36 , wherein the at least one processor is configured to select the at least one resource block from among a plurality of resource blocks reserved for transmission of peer discovery proximity detection signals by UEs.
39. The apparatus of claim 36 , wherein the at least one processor is configured to generate the peer discovery proximity detection signal for transmission on a Physical Downlink Shared Channel (PDSCH) or a Physical Downlink Control Channel (PDCCH).
40. A non-transitory computer-readable medium storing computer executable code for wireless communication, comprising code for:
generating a peer discovery proximity detection signal that includes a proximity detection reference signal and a proximity detection data signal, the peer discovery proximity detection signal containing information associated with a user equipment (UE) and occupying at least one resource block based on an orthogonal frequency division multiple access (OFDMA) modulation technique, each resource block covering a set of subcarriers in a plurality of symbol periods, wherein the code for generating the peer discovery proximity detection signal further comprises code for generating the proximity detection reference signal, which enables peer discovery of the UE, occupying a first set of resource elements in the at least one resource block and generating the proximity detection data signal, which enables peer discovery of the UE, occupying a second set of resource elements in the at least one resource block; and
transmitting the peer discovery proximity detection signal, which includes the proximity detection reference signal and the proximity detection data signal, by the UE to indicate presence of the UE.