TRANSMISSION WITH HOPPING FOR PEER-PEER COMMUNICATION

• US 20100110929A1
• Filed: 11/04/2008
• Published: 05/06/2010
• Est. Priority Date: 11/04/2008
• Status: Active Grant

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: Tavildar, Saurabb, Jovicic, Aleksandar, Wang, Ying, Richardson, Thomas, Li, Junyi
• Granted Patent: US 8,121,097 B2
• Time in Patent Office: Days
• US Class Current: 370/254
• CPC Class Codes: H04B 1/7143 Arrangements for generation of hop patterns
• CPC Class Codes: H04B 2001/6908 using time hopping
• CPC Class Codes: H04L 5/0007 the frequencies being orthogonal, e.g. OFDM(A), DMT
• CPC Class Codes: H04L 5/0032 Distributed allocation, i.e. involving a plurality of allocating devices, each making partial allocation
• CPC Class Codes: H04L 5/0042 intra-user or intra-terminal allocation
• CPC Class Codes: H04W 72/02 Selection of wireless resources by user or terminal
• CPC Class Codes: H04W 72/0446 Resources in time domain, e.g. slots or frames
• CPC Class Codes: H04W 8/005 Discovery of network devices, e.g. terminals

Abstract

Techniques for transmitting signals using time hopping or time and frequency hopping are described. In one design, a terminal selects different slots to use for transmission in multiple frames with time hopping. Each frame includes multiple slots, and each slot covers a particular time duration. The selected slots are at different time locations in the multiple frames. In another design, a terminal selects different resource units to use for transmission in multiple frames with time and frequency hopping. The selected resource units are at different time and frequency locations in the multiple frames. For both designs, the terminal sends a signal (e.g., a peer discovery signal) in the selected slots or resource units in the multiple frames. The terminal may detect for signals (e.g., peer discovery signals) from other terminals in slots not used for transmission by the terminal.

Claims

1. A method for wireless communication, comprising:

selecting different slots to use for transmission in a plurality of frames, each frame comprising multiple slots, each slot covering a particular time duration, and the selected slots being at different time locations in the plurality of frames; and

sending a signal in the selected slots in the plurality of frames.

2. The method of claim 1, wherein the selecting different slots comprises

selecting an initial slot in a first frame of the plurality of frames, and

selecting a slot in each remaining frame based on the initial slot.

3. The method of claim 1, wherein the selecting different slots comprises

selecting an initial slot in a first frame of the plurality of frames,

selecting an initial subcarrier set among multiple subcarrier sets, and

selecting a slot in each remaining frame based on the initial slot and the initial subcarrier set.

4. The method of claim 1, wherein the different slots to use for transmission are selected based on

n_t+1=(n_t+Δ

n) mod N,

where n_t is a slot to use in frame t,

Δ

n is an offset as a function of at least one of an initial subcarrier set m₀, an initial slot n₀, and frame t,

N is the number of slots in each frame, and

“

mod”

denotes a modulo operation.

5. The method of claim 1, wherein the selecting different slots comprises

selecting a slot in each frame based on a predetermined hopping function, a pseudo-random hopping function, or a Latin square.

6. The method of claim 1, further comprising:

selecting different subcarrier sets to use for transmission in the plurality of frames, and wherein the sending the signal comprises sending the signal on resource units determined by the selected subcarrier sets and the selected slots in the plurality of frames.

7. The method of claim 6, wherein the selecting different subcarrier sets comprises

selecting an initial subcarrier set among multiple subcarrier sets, and

selecting a subcarrier set for each frame based on the initial subcarrier set.

8. The method of claim 6, wherein different slots and different subcarrier sets are selected based on

n_t+1=(n_t+Δ

n) mod N and

m_t+1=(m_t+Δ

m) mod M,

where Δ

n is a slot offset, Δ

m is a subcarrier set offset, n_t is a slot to use in frame t, m_t is a subcarrier set to use in frame t, N is the number of slots in each frame, M is the number of subcarrier sets, and “

mod”

denotes a modulo operation.

9. The method of claim 8, wherein An is a function of at least one of an initial subcarrier set m₀ selected for a first frame of the plurality of frames, an initial slot n₀ selected for the first frame, and frame t.

10. The method of claim 8, wherein Δ

m is a function of at least one of an initial subcarrier set m₀ selected for a first frame of the plurality of frames, an initial slot n₀ selected for the first frame, and frame t.

11. The method of claim 6, further comprising:

measuring received powers of a plurality of resource units in at least one frame;

selecting an initial resource unit based on the received powers of the plurality of resource units; and

determining an initial slot and an initial subcarrier set for a first frame of the plurality of frames based on the initial resource unit.

12. The method of claim 6, further comprising:

pseudo-randomly selecting an initial slot and an initial subcarrier set for a first frame of the plurality of frames.

13. The method of claim 1, wherein the sending the signal comprises sending a peer discovery signal in the selected slots from a terminal for use by other terminals to detect the terminal.

14. The method of claim 13, further comprising:

detecting for peer discovery signals from other terminals in slots not used for transmission by the terminal.

15. The method of claim 1, further comprising:

receiving timing information from a timing source;

determining frame timing based on the timing information; and

selecting different slots in the plurality of frames based on a function of the frame timing.

16. An apparatus for wireless communication, comprising:

at least one processor configured to select different slots to use for transmission in a plurality of frames, each frame comprising multiple slots, each slot covering a particular time duration, and the selected slots being at different time locations in the plurality of frames, and to send a signal in the selected slots in the plurality of frames.

17. The apparatus of claim 16, wherein the at least one processor is configured to select an initial slot in a first frame of the plurality of frames, and to select a slot in each remaining frame based on the initial slot.

18. The apparatus of claim 16, wherein the at least one processor is configured to select different subcarrier sets to use for transmission in the plurality of frames, and to send the signal on resource units determined by the selected subcarrier sets and the selected slots in the plurality of frames.

19. The apparatus of claim 18, wherein the at least one processor is configured to determine an initial slot and an initial subcarrier set for a first frame of the plurality of frames based on received powers of a plurality of resource units in a frame.

20. The apparatus of claim 16, wherein the at least one processor is configured to send a peer discovery signal in the selected slots from a terminal for use by other terminals to detect the terminal, and to detect for peer discovery signals from the other terminals in slots not used for transmission by the terminal.

21. An apparatus for wireless communication, comprising:

means for selecting different slots to use for transmission in a plurality of frames, each frame comprising multiple slots, each slot covering a particular time duration, and the selected slots being at different time locations in the plurality of frames; and

means for sending a signal in the selected slots in the plurality of frames.

22. The apparatus of claim 21, wherein the means for selecting different slots comprises

means for selecting an initial slot in a first frame of the plurality of frames, and

means for selecting a slot in each remaining frame based on the initial slot.

23. The apparatus of claim 21, further comprising:

means for selecting different subcarrier sets to use for transmission in the plurality of frames, and wherein the means for sending the signal comprises means for sending the signal on resource units determined by the selected subcarrier sets and the selected slots in the plurality of frames.

24. The apparatus of claim 23, further comprising:

means for determining an initial slot and an initial subcarrier set for a first frame of the plurality of frames based on received powers of a plurality of resource units in a frame.

25. The apparatus of claim 21, wherein the means for sending a signal comprises means for sending a peer discovery signal in the selected slots from a terminal for use by other terminals to detect the terminal, the apparatus further comprising:

means for detecting for peer discovery signals from the other terminals in slots not used for transmission by the terminal.

26. A computer program product, comprising:

a computer-readable medium comprising;

code for causing at least one computer to select different slots to use for transmission in a plurality of frames, each frame comprising multiple slots, each slot covering a particular time duration, and the selected slots being at different time locations in the plurality of frames, and

code for causing the at least one computer to send a signal in the selected slots in the plurality of frames.

27. The computer program product of claim 26, the computer-readable medium further comprising:

code for causing the at least one computer to select different subcarrier sets to use for transmission in the plurality of frames, and

code for causing the at least one computer to send the signal on resource units determined by the selected subcarrier sets and the selected slots in the plurality of frames.

28. A method for wireless communication, comprising:

selecting different resource unit to use for transmission in a plurality of frames, the selected resource units being at different time and frequency locations in the plurality of frames; and

sending a signal on the selected resource units in the plurality of frames.

29. The method of claim 28, wherein the selecting different resource units comprises

selecting an initial resource unit in a first frame of the plurality of frames, and

selecting a resource unit in each remaining frame based on the initial resource unit.

30. The method of claim 28, wherein the sending a signal comprises sending a peer discovery signal on the selected resource units from a terminal for use by other terminals to detect the terminal, the method further comprising:

detecting for peer discovery signals from the other terminals in slots not used for transmission by the terminal.