Choosing parameters in a peer-to-peer communications system

• US 8,902,864 B2
• Filed: 01/10/2007
• Issued: 12/02/2014
• Est. Priority Date: 01/11/2006
• Status: Active Grant

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: Laroia, Rajiv, Li, Junyi, Wu, Xinzhou
• Primary Examiner(s): Johnson, Gerald
• Application Number:
  US11/621,978
• Publication Number:
  US 20080002647A1
• Time in Patent Office: 2,883 Days
• Field of Search: 375/145, 455/434, 370254-258
• US Class Current: 370/338
• CPC Class Codes: H04J 3/0602 Systems characterised by the synchronising information used
• CPC Class Codes: H04L 27/2601 Multicarrier modulation systems
• CPC Class Codes: H04L 27/261 Details of reference signals
• CPC Class Codes: H04L 5/0016 Time-frequency-code
• CPC Class Codes: H04L 5/0035 Resource allocation in a cooperative multipoint environment
• CPC Class Codes: H04L 5/0048 Allocation of pilot signals, i.e. of signals known to the receiver
• CPC Class Codes: H04W 16/14 Spectrum sharing arrangements between different networks
• CPC Class Codes: H04W 28/04 Error control
• CPC Class Codes: H04W 28/18 Negotiating wireless communication parameters
• CPC Class Codes: H04W 36/16 Performing reselection for specific purposes
• CPC Class Codes: H04W 40/24 Connectivity information management, e.g. connectivity discovery or connectivity update
• CPC Class Codes: H04W 40/244 using a network of reference devices, e.g. beaconing
• CPC Class Codes: H04W 48/08 Access restriction or access information delivery, e.g. discovery data delivery signalling during connection H04W76/00
• CPC Class Codes: H04W 48/16 Discovering, processing access restriction or access information
• CPC Class Codes: H04W 48/20 Selecting an access point
• CPC Class Codes: H04W 52/0229 where the received signal is a wanted signal
• CPC Class Codes: H04W 52/04 TPC
• CPC Class Codes: H04W 72/02 Selection of wireless resources by user or terminal
• CPC Class Codes: H04W 76/14 Direct-mode setup
• CPC Class Codes: H04W 8/005 Discovery of network devices, e.g. terminals
• CPC Class Codes: H04W 84/042 : Public Land Mobile systems, e.g. cellular systems
• CPC Class Codes: H04W 84/18 : Self-organising networks, e.g. ad-hoc networks or sensor networks
• CPC Class Codes: H04W 88/02 : Terminal devices
• CPC Class Codes: H04W 88/04 : adapted for relaying to or from another terminal or user
• CPC Class Codes: H04W 88/06 : adapted for operation in multiple networks or having at least two operational modes, e.g. multi-mode terminals
• CPC Class Codes: H04W 88/10 : adapted for operation in multiple networks, e.g. multi-mode access points
• CPC Class Codes: Y02D 30/70 : in wireless communication networks

Abstract

Systems and methodologies are described that facilitate choosing parameters to utilize in a local area peer-to-peer network. The parameters may relate to tone spacing, cyclic prefix, symbol time and the like. Further, the parameters may be a function of a state (e.g. peer discovery state control related traffic state, data related traffic state, . . . ) associated with the local area peer-to-peer network. Moreover, the local area peer-to-peer network may share spectrum with a wide area network; as such, parameters for the peer-to-peer network may be selected based on the type of wide area network (e.g., air interface technology)and/or wide area network related parameters.

Claims

1. A method of operating a communications device, the method comprising:

utilizing a first symbol time during a first state of peer-to-peer operation, said first state being one of a peer discovery state or a control related traffic state, said first symbol time being specified in a first set of parameters; and

utilizing a second symbol time which is longer than said first symbol time during a second state of peer-to-peer operation, said second state being a data related traffic state of peer-to-peer operation, said second symbol time being specified in a second set of parameters.

2. The method of claim 1,

wherein utilizing a first symbol time during a first state of peer-to-peer operation includes using said first symbol time during a first time interval, said first time interval being one of a peer discovery time interval and a traffic control time interval;

and

wherein utilizing a second symbol time during a data related traffic state of peer-to-peer operation includes using said second symbol time during a second time interval which follows said first time interval, said second time interval being a data traffic time interval.

3. The method of claim 2,

wherein said first state of peer-to-peer operation is a peer discovery state and said first time interval is a peer discovery time interval;

wherein said peer discovery state is a half-duplex mode state of peer-to-peer operation and said traffic state is not a half-duplex mode state of peer-to-peer operation; and

wherein the method further comprises;

utilizing the first symbol time during the traffic control time interval which occurs between said peer discovery time interval and said data traffic time interval.

4. The method of claim 1,

wherein utilizing a first symbol time during a first state of peer-to-peer operation includes using said first symbol time during a first time interval, said first time interval being a traffic control time interval;

wherein utilizing a second symbol time during a data related traffic state of peer-to-peer operation includes using said second symbol time during a data traffic time interval which follows said traffic control time interval and is part of a traffic interval to which said traffic control interval also corresponds; and

wherein the first set of parameters includes a larger tone spacing than the second set of parameters.

6. The method of claim 1, further comprising identifying whether the first state or the second state is associated with a current time.

7. The method of claim 6, further comprising deriving the current time from a system source and determining the state associated with the current time using a predetermined mapping between the state and the current time.

8. The method of claim 7, wherein the system source is one of a broadcast signal from a base station of a wide area network or an access point, a satellite signal from a GPS satellite, and a clock signal from an internal clock.

9. The method of claim 6, further comprising accessing parameters as a function of the identified state.

10. The method of claim 9, accessing the parameters further comprises retrieving the parameters corresponding to the identified state from a lookup table retained in memory.

11. The method of claim 9, accessing the parameters further comprises calculating the parameters based at least in part upon the identified state.

12. The method of claim 1, wherein the peer-to-peer network shares bandwidth with a wide area network.

5. A method that facilitates selecting parameters in a local area peer-to-peer network, comprising:

utilizing a first set of parameters for a first state in a peer-to-peer network, said first state being a peer discovery state of peer-to-peer operation, said first set of parameters specifying a first symbol time;

utilizing a second set of parameters for a second state in the peer-to-peer network, said second state being a traffic state of peer-to-peer operation, said second set of parameters specifying a second symbol time, said second symbol time being longer than said first symbol time;

wherein the local area peer-to-peer network uses an OFDM-based air interface technology and the parameters relate to tone spacing, symbol time, and/or cyclic prefix; and

wherein the first set of parameters and the second set of parameters include parameters corresponding to similar cyclic prefixes.

50. The method of claim 5, wherein said similar cyclic prefixes have the same length.

13. A method that facilitates selecting parameters in a local area peer-to-peer network, comprising:

utilizing a first set of parameters for a first state in a peer-to-peer network, said first state being a peer discovery state of peer-to-peer operation, said first set of parameters specifying a first symbol time;

utilizing a second set of parameters for a second state in the peer-to-peer network, said second state being a traffic state of peer-to-peer operation, said second set of parameters specifying a second symbol time, said second symbol time being longer than said first symbol time; and

wherein the first set of parameters and the second set of parameters are a function of parameters related to a wide area network which shares bandwidth with the peer-to-peer network, the wide area network using a symbol time which is longer than the first and second symbol times.

14. A wireless communications apparatus, comprising:

a memory that includes instructions which when executed, control the communications apparatus to;

utilize a first symbol time during a first state of peer-to-peer operation, said first state being one of a peer discovery state or a control related traffic state, said first symbol time being specified in a first set of parameters; and

utilize a second symbol time which is longer than said first symbol time during a second state of peer-to-peer operation, said second state being a data related traffic state of peer-to-peer operation, said second symbol time being specified in a second set of parameters; and

a processor, coupled to the memory, configured to execute the instructions retained in the memory.

15. The wireless communications apparatus of claim 14, wherein controlling the communications apparatus to utilize a first symbol time during a first state of peer-to-peer operation includes controlling the communications apparatus to use said first symbol time during a first time interval, said first time interval being one of a peer discovery time interval and a traffic control time interval;

and

wherein controlling the communications apparatus to utilize a second symbol time during a data related traffic state of peer-to-peer operation includes controlling the communications apparatus to use said second symbol time during a second time interval which follows said first time interval, said second time interval being a data traffic time interval.

16. The wireless communications apparatus of claim 15, wherein the memory further includes instructions which when executed by said processor control the communications apparatus to recognize time periods associated with peer discovery, data related traffic, and control related traffic according to a predetermined mapping between the state and the time periods.

17. The wireless communications apparatus of claim 14, wherein the memory further retains instructions which when executed by said processor control the communications apparatus to synchronize the state with a peer located within communication range.

18. The wireless communications apparatus of claim 17, wherein the memory further retains instructions which when executed by said processor control the communications apparatus to derive timing information from a system source and determine the state associated with the timing information using a predetermined mapping between the state and the timing information.

20. The wireless communications apparatus of claim 14, wherein the memory further retains instructions which when executed by said processor control the communications apparatus to determine the state based upon a predetermined formula.

21. The wireless communications apparatus of claim 14, wherein the memory further retains a lookup table that includes parameter data for the peer-to-peer network that corresponds to said first and second of states.

22. The wireless communications apparatus of claim 21, wherein the memory further retains instructions which when executed by said processor control the communications apparatus to retrieve parameter data from the lookup table based upon the identified state.

23. The wireless communications apparatus of claim 14, wherein the memory further retains instructions which when executed by said processor control the communications apparatus to derive at least one parameter of said first set of parameters as a function of the identified state.

24. The wireless communications apparatus of claim 14, wherein the memory further retains instructions which when executed by said processor control the communications apparatus to identify an air interface technology of a wide area network that shares bandwidth with a peer-to-peer network over which the peer-to-peer communications traverse.

25. The wireless communications apparatus of claim 24, wherein the memory further retains instructions which when executed by said processor control the communications apparatus to select at least one parameter of said first set of parameters based upon the identified air interface technology of the wide area network.

19. The wireless communications apparatus of 18, wherein the system source is one of a broadcast signal from a base station of a wide area network or an access point, a satellite signal from a GPS satellite, and a clock signal from an internal clock.

26. A wireless communications apparatus, comprising:

means for identifying a state associated with peer-to-peer communication; and

means for utilizing a first symbol time during a first state of peer-to-peer operation, said first state being one of a peer discovery state or a control related traffic state, said first symbol time being specified in a first set of parameters, and for utilizing a second symbol time which is longer than said first symbol time during a second state of peer-to-peer operation, said second state being a data related traffic state of peer-to-peer operation, said second symbol time being specified in a second set of parameters.

27. The wireless communications apparatus of claim 26, wherein said means for utilizing a first symbol time during a first state of peer-to-peer operation and a second state during a second state of peer-to-peer operation use said first symbol time during a first time interval, said first time interval being one of a peer discovery time interval and a traffic control time interval, and use said second symbol time during a second time interval which follows said first time interval, said second time interval being a data traffic time interval.

28. The wireless communications apparatus of claim 27, further comprising means for selecting a shorter symbol time and a larger tone spacing when the identified state is the first state as compared to when the identified state is the second state.

30. The wireless communications apparatus of claim 26, further comprising means for identifying whether the first state or the second state is associated with a current time.

31. The wireless communications apparatus of claim 30, further comprising:

means for synchronizing the current time based upon a system source; and

means for determining the state associated with the current time utilizing a predetermined mapping between the state and the current time.

32. The wireless communications apparatus of claim 31, wherein the system source is one of a broadcast signal from a base station of a wide area network or an access point, a satellite signal from a GPS satellite, and a clock signal from an internal clock.

33. The wireless communications apparatus of claim 26, further comprising means for identifying a type of air interface technology associated with a wide area network that shares spectrum with the local area peer-to-peer network.

34. The wireless communications apparatus of claim 33, further comprising means for selecting a set of parameters from said plurality of different sets of parameters based upon the state and the air interface technology.

35. The wireless communications apparatus of claim 26, further comprising means for calculating at least one parameter of said first set of parameters based upon the identified state.

36. The wireless communications apparatus of claim 26, further comprising means for retrieving at least one parameter of the first set of parameters from a lookup table retained in memory based upon the identified state.

29. A wireless communications apparatus that enables communication over a local area peer-to-peer network, comprising:

means for identifying a state associated with peer-to-peer communication;

means for accessing one of a plurality of different sets of parameters to be used for the peer-to-peer communication as a function of the state at a given point in time, said plurality of different sets of parameters including a first set of parameters specifying a first symbol time to be used in a peer discovery state of peer-to-peer operation and a second set of parameters specifying a second symbol time to be used in a traffic state of peer-to-peer operation, said second symbol time being longer than said first symbol time; and

means for selecting a similar cyclic prefix when the identified state is a peer discovery state, a control related traffic state, or a data related traffic state; and

wherein the peer-to-peer communication utilizes an OFDM-based air interface technology and the different sets of parameters relate to tone spacing, symbol time, and/or cyclic prefix.

37. A non-transitory machine-readable medium having stored thereon machine-executable instructions for controlling a wireless communications apparatus to:

determine a state of a peer-to-peer network;

determine a type of wide area network that shares a common bandwidth with the peer-to-peer network; and

acquire parameter data for use with the peer-to-peer network based on the type of the wide area network, said parameter data including a first set of parameters specifying a first symbol time to be used in a peer discovery state of peer-to-peer operation and a second set of parameters specifying a second symbol time to be used in a traffic state of peer-to-peer operation, said second symbol time being longer than said first symbol time.

38. The non-transitory machine-readable medium of claim 37, the machine-executable instructions further comprise deriving the state based upon a predetermined formula and a synchronized time.

39. The non-transitory machine-readable medium of claim 38, the machine-executable instructions further comprise synchronizing the time based upon information obtained from a system source and determining the state associated with the time using a predetermined mapping between the state and the time.

40. The non-transitory machine-readable medium of claim 39, wherein the system source is one of a broadcast signal from a base station of a wide area network or an access point, a satellite signal from a GPS satellite, and a clock signal from an internal clock.

41. The non-transitory machine-readable medium of claim 37, the machine-executable instructions further comprise obtaining parameters related to the wide area network and acquiring parameter data as a function of the wide area network related parameters.

42. The non-transitory machine-readable medium of claim 37, wherein the peer-to-peer network uses an OFDM-based air interface technology and the parameter data relates to tone spacing, symbol time, and/or cyclic prefix.

43. The non-transitory machine-readable medium of claim 42, the machine-executable instructions further comprise acquiring parameter data that includes a shorter symbol time and a larger tone spacing when the identified state relates to peer discovery or control related traffic as compared to when the identified state relates to data related traffic.

44. The non-transitory machine-readable medium of claim 42, the machine-executable instructions further comprise obtaining parameter data that includes a similar cyclic prefix when the identified state is a peer discovery state, a control related traffic state, and a data related traffic state.

45. In a wireless communication system, an apparatus comprising:

a processor configured to;

utilize a first symbol time during a first state of peer-to-peer operation, said first state being one of a peer discovery state or a control related traffic state, said first symbol time being specified in a first set of parameters; and

utilize a second symbol time which is longer than said first symbol time during a second state of peer-to-peer operation, said second state being a data related traffic state of peer-to-peer operation, said second symbol time being specified in a second set of parameters.

46. A method of operating a wireless communications device, comprising:

determining a state of a peer-to-peer network;

determining a type of wide area network that shares a common bandwidth with the peer-to-peer network; and

acquiring parameter data for use with the peer-to-peer network based on the type of the wide area network, said parameter data including a first set of parameters specifying a first symbol time to be used in a peer discovery state of peer-to-peer operation and a second set of parameters specifying a second symbol time to be used in a traffic state of peer-to-peer operation, said second symbol time being longer than said first symbol time.

47. A wireless communications apparatus comprising:

means for determining a state of a peer-to-peer network;

means for determining a type of wide area network that shares a common bandwidth with the peer-to-peer network; and

means for acquiring parameter data for use with the peer-to-peer network based on the type of the wide area network, said parameter data including a first set of parameters specifying a first symbol time to be used in a peer discovery state of peer-to-peer operation and a second set of parameters specifying a second symbol time to be used in a traffic state of peer-to-peer operation, said second symbol time being longer than said first symbol time.

48. A wireless communications apparatus comprising:

at least one processor configured to;

determine a state of a peer-to-peer network;

determine a type of wide area network that shares a common bandwidth with the peer-to-peer network; and

acquire parameter data for use with the peer-to-peer network based on the type of the wide area network, said parameter data including a first set of parameters specifying a first symbol time to be used in a peer discovery state of peer-to-peer operation and a second set of parameters specifying a second symbol time to be used in a traffic state of peer-to-peer operation, said second symbol time being longer than said first symbol time; and

a memory coupled to said at least one processor.

49. A method of operating a communications device, the method comprising:

utilizing a first symbol time during a first state of peer-to-peer operation, said first state being one of a peer discovery state or a control related traffic state, said first symbol time being specified in a first set of parameters, utilizing a first symbol time during a first state of peer-to-peer operation including both transmitting and receiving during a first time interval; and

utilizing a second symbol time which is longer than said first symbol time during a second state of peer-to-peer operation, said second state being a data related traffic state of peer-to-peer operation, said second symbol time being specified in a second set of parameters, utilizing a second symbol time including performing a single one of transmitting and receiving during a second time interval.