CHOOSING PARAMETERS IN A PEER-TO-PEER COMMUNCATIONS SYSTEM

• US 20080002647A1
• Filed: 01/10/2007
• Published: 01/03/2008
• Est. Priority Date: 01/11/2006
• Status: Active Grant

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: Laroia, Rajiv, Wu, Xinzhou, Li, Junyi
• Granted Patent: US 8,902,864 B2
• Time in Patent Office: Days
• 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 that facilitates selecting parameters in a local area peer-to-peer network, comprising:

utilizing a first set or parameters for a first state in a peer-to-peer network; and

utilizing a second set of parameters for a second state in the peer-to-peer network.

2. The method of claim 1, 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.

3. The method of claim 2, wherein the first state is a peer-discovery state or a control related traffic state and the second state is a data related traffic state.

4. The method of claim 3, wherein the first set of parameters includes a shorter symbol time and a larger tone spacing than the second set of parameters.

5. The method of claim 3, wherein the first set of parameters and the second set of parameters include similar cyclic prefixes.

6. The method of claim 1, wherein the first set of parameters is utilized during a predetermined time period for the first state and the second set of parameters is utilized during a disparate predetermined time period for the second state.

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

8. The method claim 7, 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.

9. The method of claim 8, 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.

10. The method of claim 7, further comprising accessing parameters as a function of the identified state.

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

12. The method of claim 10, accessing the parameters further comprises calculating the parameters based at least in part upon the identified state.

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

14. The method of claim 13, wherein the first set of parameters and the second set of parameters are a function of parameters related to the wide area network.

15. A wireless communications apparatus, comprising:

a memory that retains instructions related to identifying a state associated with peer-to-peer communication and ascertaining a set of parameters to be used for the peer-to-peer communication as a function of the identified state; and

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

16. The wireless communications apparatus of claim 15, wherein the peer-to-peer communication leverages an ofdm-based air interface technology and the set of parameters relates to tone spacing, symbol time and/or cyclic prefix.

17. The wireless communications apparatus of claim 16, wherein the memory further retains instructions for recognizing 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.

18. The wireless communications apparatus of claim 15, wherein the memory further retains instructions for synchronizing the state with a peer located within communication range.

19. The wireless communications apparatus of claim 18, wherein the memory further retains instructions for deriving timing information from a system source and determining the state associated with the timing information using a predetermined mapping between the state and the timing information.

21. The wireless communications apparatus of claim 15, wherein the memory further retains instructions for determining the state based upon a predetermined formula.

22. The wireless communications apparatus of claim 15, wherein the memory further retains a lookup table that includes parameter data for the peer-to-peer network that corresponds to a plurality of states.

23. The wireless communications apparatus of claim 22, wherein the memory further retains instructions for retrieving parameter data from the lookup table based upon the identified state.

24. The wireless communications apparatus of claim 15, wherein the memory further retains instructions for deriving at least one of the parameters as a function of the identified state.

25. The wireless communications apparatus of claim 15, wherein the memory further retains instructions for identifying 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.

26. The wireless communications apparatus of claim 25, wherein the memory further retains instructions for selecting at least one of the parameters based upon the identified air interface technology of the wide area network.

29. The wireless communications apparatus of claim 23, further comprising means for selecting a shorter symbol time and a larger tone spacing when the state relates to peer discovery or control related traffic as compared to when the state relates to data related traffic.

20. The wireless communications apparatus of 19, 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.

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

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

means for accessing a set of parameters to be used for the peer-to-peer communication as a function of the state.

28. The wireless communications apparatus of claim 27, wherein the peer-to-peer communication utilizes an OFDM-based air interface technology and the set of parameters relates to tone spacing, symbol time and/or cyclic prefix.

30. The wireless communications apparatus of claim 28, further comprising 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.

31. The wireless communications apparatus of claim 27, further comprising means for identifying the state based upon a current time.

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

means for synchronization 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.

33. The wireless communications apparatus of claim 32, 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.

36. The wireless communications apparatus or claim 27, further comprising means for calculating at least one parameter of the set of parameters based upon the identified state.

37. The wireless communications apparatus of claim 27, further comprising means for retrieving at least one parameter of the set of parameters from a lookup table retained in memory based upon the identified state.

34. The wireless communications apparatus of claim 34, 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.

35. The wireless communications apparatus of claim 34, further comprising means for selecting the set of parameters based upon the state and the air interface technology.

38. A machine-readable medium having stored thereon machine-executable instructions for:

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 sate and the type of the wide area network.

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

40. The machine-readable medium of claim 39, 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.

41. The machine-readable medium of claim 40, 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.

42. The machine-readable medium of claim 38, 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.

43. The machine-readable medium of claim 38, 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.

44. The machine-readable medium of claim 43, 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.

45. The machine-readable medium of claim 43, 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.

46. in a wireless communication system, an apparatus comprising:

a processor configured to;

determine a state associated with communications via a peer-to-peer network and;

obtain a set of parameters to be utilized for communicating via the peer-to-peer network as a function of the state.