TRANSMISSION AND RECEPTION OF PROXIMITY DETECTION SIGNAL FOR PEER DISCOVERY

• US 20180234830A1
• Filed: 04/11/2018
• Published: 08/16/2018
• Est. Priority Date: 04/15/2010
• Status: Active Application

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: WANG, Renqiu, MALLIK, Siddhartha, PALANKI, Ravi, BHUSHAN, Naga, LUO, Tao, MALLADI, Durga Prasad
• Application Number:
  US15/951,126
• Publication Number:
  US 20180234830A1
• Time in Patent Office: Days
• CPC Class Codes: H04L 5/0053 Allocation of signaling, i.e. of overhead other than pilot signals
• CPC Class Codes: H04L 67/104 Peer-to-peer [P2P] networks
• CPC Class Codes: H04W 4/02 Services making use of location information
• CPC Class Codes: H04W 56/002 Mutual synchronization
• CPC Class Codes: H04W 56/0025 synchronizing potentially movable access points
• CPC Class Codes: H04W 72/00 Local resource management
• CPC Class Codes: H04W 72/0453 Resources in frequency domain, e.g. a carrier in FDMA
• CPC Class Codes: H04W 76/10 Connection setup
• CPC Class Codes: H04W 8/005 Discovery of network devices, e.g. terminals
• CPC Class Codes: H04W 92/18 between terminal devices

Abstract

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.

Claims

1. A method for wireless communication of a user equipment (UE), comprising:

generating a peer discovery signal comprising a primary synchronization signal (PSS) and a secondary synchronization signal (SSS); and

transmitting the peer discovery signal including the PSS and the SSS to indicate presence of the UE.

2. The method of claim 1, wherein the PSS in the peer discovery signal is transmitted in a first single-carrier frequency division multiple access (SC-FDMA) symbol and the SSS in the peer discovery signal is transmitted in a second SC-FDMA symbol.

3. The method of claim 1, further comprising:

receiving primary and secondary synchronization signals transmitted by a base station in a wireless network,

wherein the peer discovery signal is transmitted such that the PSS and the SSS in the peer discovery signal avoid collision with the primary and secondary synchronization signals transmitted by the base station.

4. The method of claim 1, wherein the PSS and the SSS are positioned at symbol locations to avoid collision with primary and secondary synchronization signals transmitted by a base station in a wireless network.

5. The method of claim 1, wherein the transmitting the peer discovery signal comprises transmitting the peer discovery signal at a center frequency that is different from a center frequency used for primary and secondary synchronization signals transmitted by a base station.

6. The method of claim 5, further comprising:

selecting the center frequency from a set of center frequencies designated for transmission of peer discovery signals by UEs.

7. The method of claim 1, wherein the transmitting the peer discovery signal comprises:

transmitting the PSS in the peer discovery signal at a first symbol location different from a symbol location used for transmitting a primary synchronization signal by a base station; and

transmitting the SSS in the peer discovery signal at a second symbol location different from a symbol location used for transmitting a secondary synchronization signal by the base station.

8. The method of claim 1, wherein the generating the peer discovery signal comprises scrambling the SSS in the peer discovery signal with a scrambling sequence not used for a secondary synchronization signal transmitted by a base station.

9. The method of claim 1, wherein the transmitting the peer discovery signal comprises transmitting the PSS and the SSS on an uplink spectrum or a dedicated spectrum for peer-to-peer (P2P) communication.

10. The method of claim 1, further comprising:

transmitting a reference signal in a subframe in which the peer discovery signal is transmitted.

11. The method of claim 1, wherein the transmitting the peer discovery signal comprises:

determining symbol periods allocated to a base station with which the UE is associated, the allocated symbol periods being designated for transmission of peer discovery signals by UEs associated with the base station; and

transmitting the peer discovery signal in at least one symbol period among the symbol periods allocated to the base station.

12. The method of claim 1, wherein the transmitting the peer discovery signal comprises:

determining a frequency range allocated to a base station with which the UE is associated, the frequency range being designated for transmission of peer discovery signals by UEs associated with the base station; and

transmitting the peer discovery signal in the frequency range.

13. An apparatus for wireless communication, comprising:

means for generating a peer discovery signal comprising a primary synchronization signal (PSS) and a secondary synchronization signal (SSS); and

means for transmitting the peer discovery signal including the PSS and the SSS to indicate presence of the UE.

14. The apparatus of claim 13, wherein the means for transmitting is configured to transmit the peer discovery signal at a center frequency that is different from a center frequency used for primary and secondary synchronization signals transmitted by a base station.

15. The apparatus of claim 13, wherein the means for transmitting is configured to:

transmit the PSS in the peer discovery signal at a first symbol location different from a symbol location used by a base station to transmit a primary synchronization signal; and

transmit the SSS in the peer discovery signal at a second symbol location different from a symbol location used by the base station to transmit a secondary synchronization signal.

16. An apparatus for wireless communication, comprising:

a memory; and

at least one processor coupled to the memory and configured to;

generate a peer discovery signal comprising a primary synchronization signal (PSS) and a secondary synchronization signal (SSS); and

transmit the peer discovery signal including the PSS and the SSS to indicate presence of the UE.

17. The apparatus of claim 16, wherein the at least one processor is configured to transmit the PSS in the peer discovery signal in a first single-carrier frequency division multiple access (SC-FDMA) symbol and transmit the SSS in a second SC-FDMA symbol.

18. The apparatus of claim 16, wherein the at least one processor is configured to transmit the peer discovery signal at a center frequency that is different from a center frequency used for primary and secondary synchronization signals transmitted by a base station.

19. The apparatus of claim 16, wherein the at least one processor is configured to:

transmit the PSS in the peer discovery signal at a first symbol location different from a symbol location used by a base station to transmit a primary synchronization signal; and

transmit the SSS in the peer discovery signal at a second symbol location different from a symbol location used by the base station to transmit a secondary synchronization signal.

20. A non-transitory computer-readable medium storing computer executable code, comprising code to:

generate a peer discovery signal comprising a primary synchronization signal (PSS) and a secondary synchronization signal (SSS); and

transmit the peer discovery signal including the PSS and the SSS to indicate presence of the UE.