Method and apparatus for signaling beacons in a communication system

• US 8,351,405 B2
• Filed: 07/14/2006
• Issued: 01/08/2013
• Est. Priority Date: 07/14/2006
• Status: Active Grant

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: Li, Junyi, Parizhisky, Vladimir, Leonidov, Alexander, Richardson, Thomas J.
• Primary Examiner(s): Zewdu, Meless N
• Assistant Examiner(s): PATEL, MAHENDRA R
• Application Number:
  US11/486,653
• Publication Number:
  US 20080013479A1
• Time in Patent Office: 2,370 Days
• Field of Search: 370/330, 370/311, 370/331, 370/332, 370/478, 455/436, 455/437, 455/403, 455/456, 455/434, 455/522, 455/454
• US Class Current: 370/336
• CPC Class Codes: H04L 27/261 Details of reference signals
• CPC Class Codes: H04L 5/0007 the frequencies being orthogonal, e.g. OFDM(A), DMT

Abstract

Methods and apparatus for improved beacon signaling in a wireless communication system are described. Information is encoded in the tone position of the beacon tone. The information encoded may include sector type, sector index and slope index, as well as some time index. The information is coded in the tone position so that any few of several beacons can be decoded in order to decode the information. The methods and apparatus described in the invention improve the robustness against frequency selective fading and do not require wireless terminals to establish synchronization for reliable base station detection.

Claims

1. A method of broadcasting beacon signals in a frequency division multiplexing communication system, the method comprising:

identifying a plurality of disjoint beacon subsets of available tones in a single contiguous tone block for communicating beacon signals in the communication system, said plurality of disjoint subsets of available tones including a first beacon subset, a second beacon subset, and a third beacon subset within said contiguous tone block;

wherein tones in said first, second and third beacon subsets are interspersed in said tone block such that at least two tones of the first beacon subset have at least one tone of a different one of the plurality of disjoint beacon subsets between them;

selecting, from the first beacon subset, as a function of cell information and sector information, a first tone for use as a first beacon tone of a first indexed beacon slot, said first indexed beacon slot being part of a timing structure including a plurality of indexed beacon slots;

generating a first beacon signal; and

transmitting the generated first beacon signal on the first beacon tone in the first indexed beacon slot;

wherein none of the tones in said plurality of disjoint beacon subsets of available tones are immediately adjacent another tone in said plurality of disjoint beacon subsets of available tones; and

wherein tones in the first subset have a tone spacing of at least nine tones.

2. The method of claim 1, further comprising:

coding at least a first portion of a plurality of communication system parameters into a first beacon tone index, the first beacon tone index corresponding to the first beacon tone.

3. The method of claim 2, wherein a first communication system parameter of the plurality of communication system parameters is a slope hopping index.

4. The method of claim 2, wherein a second communication system parameter of the plurality of communication system parameters is a sector type.

5. The method of claim 2, further comprising:

selecting, from the second beacon subset, as a function of the cell information and sector information, a second tone for use as a second beacon tone of a second indexed beacon slot in said recurring timing structure;

generating a second beacon signal; and

transmitting the generated a second beacon signal, on the second beacon tone of the second beacon subset in the second indexed beacon slot.

6. The method of claim 5, further comprising:

coding at least a second portion of the plurality of communication system parameters into a second beacon tone index, the second beacon tone index corresponding to the second beacon tone, wherein the second portion is different from the first portion.

7. The method of claim 6, further comprising:

selecting, for a third indexed beacon slot in said recurring timing structure, as a function of the cell information and sector information, a third tone from the third beacon subset for use as a third beacon tone of the third indexed beacon slot;

generating a third beacon signal; and

transmitting the generated third beacon signal on the third beacon tone in the third indexed time slot.

8. The method of claim 5, wherein between any two tones of said second beacon subset there is at least one tone corresponding to a different beacon subset.

30. The method of claim 1, wherein two adjacent tones in said contiguous tone block include at most one tone from any one of the first, second or third beacon subsets.

34. The method of claim 1, wherein tones in said disjoint beacon subsets of available tones are separated by at least two tones which are not included in said disjoint beacon subsets of available tones.

9. A non-transitory computer readable medium embodying instructions for controlling a communications device to broadcast beacon signals in a frequency division multiplexing communication system, the non-transitory computer readable medium comprising:

instructions for controlling said device to identify a plurality of disjoint beacon subsets of available tones in a single contiguous tone block for communicating beacon signals in the communication system, said plurality of disjoint subsets of available tones including a first beacon subset, a second beacon subset, and a third beacon subset within said contiguous tone block;

wherein tones in said first, second and third beacon subsets are interspersed in said tone block such that at least two tones of the first beacon subset have at least one tone of a different one of the plurality of disjoint beacon subsets between them;

instructions for controlling said device to select, from the first beacon subset, as a function of cell information and sector information, a first tone for use as a first beacon tone of a first indexed beacon slot, said first indexed beacon slot being part of a timing structure including a plurality of indexed beacon slots;

instructions for controlling said device to generate a first beacon signal; and

instructions for controlling said device to transmit the generated first beacon signal, on the first beacon tone in the first indexed beacon slot;

wherein none of the tones in said plurality of disjoint beacon subsets of available tones are immediately adjacent another tone in said plurality of disjoint beacon subsets of available tones; and

wherein tones in the first subset have a tone spacing of at least nine tones.

10. The non-transitory computer readable medium of claim 9, wherein the non-transitory computer readable medium further comprises:

instructions for controlling said device to code at least a first portion of a plurality of communication system parameters into a first beacon tone index, the first beacon tone index corresponding to the first beacon tone.

11. The non-transitory computer readable medium of claim 10, wherein a first communication system parameter of the plurality of communication system parameters is a slope hopping index.

12. The non-transitory computer readable medium of claim 10, wherein a second communication system parameter of the plurality of communication system parameters is a sector type.

13. The non-transitory computer readable medium of claim 10, wherein the non-transitory computer readable medium further comprises:

instructions for controlling said device to select, from the second beacon subset, as a function of cell information and sector information, a second tone for use as a second beacon tone of a second indexed beacon slot in said recurring timing structure;

instructions for controlling said device to generate a second beacon signal; and

instructions for controlling said device to transmit the generated second beacon signal, on the second beacon tone in the second indexed beacon slot.

14. The non-transitory computer readable medium of claim 13, wherein the non-transitory computer readable medium further comprises:

instructions for controlling said device to code at least a second portion of the plurality of communication system parameters into a second beacon tone index, the second beacon tone index corresponding to the second beacon tone, wherein the second portion is different from the first portion.

15. The non-transitory computer readable medium of claim 13, wherein between any two tones of said second beacon subset there is at least one tone corresponding to a different beacon subset.

31. The non-transitory computer readable medium of claim 9, wherein two adjacent tones in said contiguous tone block include at most one tone from any one of the first, second or third beacon subsets.

35. The non-transitory computer readable medium of claim 9, wherein tones in said disjoint beacon subsets of available tones are separated by at least two tones which are not included in said disjoint beacon subsets of available tones.

16. A wireless communication device for broadcasting beacon signals in a frequency division multiplexing communication system, the device comprising:

means for identifying a plurality of disjoint beacon subsets of available tones in a single contiguous tone block for communicating beacon signals in the communication system, said plurality of disjoint subsets of available tones including a first beacon subset, a second beacon subset, and a third beacon subset within said contiguous tone block;

wherein tones in said first, second and third beacon subsets are interspersed in said tone block such that at least two tones of the first beacon subset have at least one tone of a different one of the plurality of disjoint beacon subsets between them;

means for selecting, from the first beacon subset, as a function of cell information and sector information, a first tone for use as a first beacon tone of a first indexed beacon slot, said first indexed beacon slot being part of a timing structure including a plurality of indexed beacon slots;

means for generating a first beacon signal; and

means for transmitting the generated first beacon signal, on the first beacon tone in the first indexed beacon slot;

wherein none of the tones in said plurality of disjoint beacon subsets of available tones are immediately adjacent another tone in said plurality of disjoint beacon subsets of available tones; and

wherein tones in the first subset have a tone spacing of at least nine tones.

17. The wireless communication device of claim 16, further comprising:

means for coding at least a first portion of a plurality of communication system parameters into a first beacon tone index, the first beacon tone index corresponding to the first beacon tone.

18. The wireless communication device of claim 17, wherein a first communication system parameter of the plurality of communication system parameters is a slope hopping index.

19. The wireless communication device of claim 17, wherein a second communication system parameter of the plurality of communication system parameters is a sector type.

20. The wireless communication device of claim 17, further comprising:

means for selecting, from the second beacon subset, as a function of the cell information and sector information, a second tone for use as a second beacon tone of a second indexed beacon slot in said recurring timing structure means for generating a second beacon signal; and

means for transmitting the generated a second beacon signal, on the second beacon tone of the second beacon subset in the second indexed beacon slot.

21. The wireless communication device of claim 20, further comprising:

means for coding at least a second portion of the plurality of communication system parameters into a second beacon tone index, the second beacon tone index corresponding to the second beacon tone, wherein the second portion is different from the first portion.

22. The wireless communication device of claim 20, wherein between any two tones of said second beacon subset there is at least one tone corresponding to a different beacon subset.

32. The wireless communication device of claim 16, wherein two adjacent tones in said contiguous tone block include at most one tone from any one of the first, second or third beacon subsets.

36. The wireless communication device of claim 16, wherein tones in said disjoint beacon subsets of available tones are separated by at least two tones which are not included in said disjoint beacon subsets of available tones.

23. A wireless communication device for broadcasting beacon signals in a frequency division multiplexing communication system, the wireless communication device comprising:

a processor configured to perform a method, the method comprising;

identifying a plurality of disjoint beacon subsets of available tones in a single contiguous tone block for communicating beacon signals in the communication system, said plurality of disjoint subsets of available tones including a first beacon subset, a second beacon subset, and a third beacon subset within said contiguous tone block

wherein tones in said first, second and third beacon subsets are interspersed in said tone block such that at least two tones of the first beacon subset have at least one tone of a different one of the plurality of disjoint beacon subsets between them;

selecting, from the first beacon subset, as a function of cell information and sector information, a first tone for use as a first beacon tone of a first indexed beacon slot, said first indexed beacon slot being part of a timing structure including a plurality of indexed beacon slots; and

generating a first beacon signal; and

a transmitter connected to the processor and configured to transmit the generated first beacon signal, on the first beacon tone in the first indexed beacon slot;

wherein none of the tones in said plurality of disjoint beacon subsets of available tones are immediately adjacent another tone in said plurality of disjoint beacon subsets of available tones; and

wherein tones in the first subset have a tone spacing of at least nine tones.

24. The wireless communication device of claim 23, wherein the method, performed by said processor, further comprises:

coding at least a first portion of a plurality of communication system parameters into a first beacon tone index, the first beacon tone index corresponding to the first beacon tone.

25. The wireless communication device of claim 24, wherein a first communication system parameter of the plurality of communication system parameters is a slope hopping index.

26. The wireless communication device of claim 24, wherein a second communication system parameter of the plurality of communication system parameters is a sector type.

27. The wireless communication device of claim 24, wherein the method, performed by said processor, further comprises:

selecting, from the second beacon subset, as a function of cell information and sector information, a second tone for use as a second beacon tone of a second indexed beacon slot in said recurring timing structure;

generating a second beacon signal; and

wherein the transmitter is further configured to transmit the generated a second beacon signal, on the second beacon tone of the second beacon subset in the second indexed beacon slot.

28. The wireless communication device of claim 27, wherein the method, performed by said processor, further comprises:

coding at least a second portion of the plurality of communication system parameters into a second beacon tone index, the second beacon tone index corresponding to the second beacon tone, wherein the second portion is different from the first portion.

29. The wireless communication device of claim 27, wherein between any two tones of said second beacon subset there is at least one tone corresponding to a different beacon subset.

33. The wireless communication device of claim 23, wherein two adjacent tones in said contiguous tone block include at most one tone from any one of the first, second or third beacon subsets.

37. The wireless communication device of claim 23, wherein tones in said disjoint beacon subsets of available tones are separated by at least two tones which are not included in said disjoint beacon subsets of available tones.