# US 8,542,658 B2 · Support for wide area networks and local area peer-to-peer networks > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 8,542,658 B2 - Document ID: US8542658B2 - Status: Granted - Kind: B2 - Application number: 11/621,972 - Filed: 2007-01-10 - Published: 2007-09-13 - Granted: 2013-09-24 - Earliest claimed: 2006-01-11 - Assignees: QUALCOMM Incorporated - Applicants: Rajiv Laroia; Junyi Li; Tom Richardson; Xinzhou Wu; Aleksandar Jovicic - Inventors: Rajiv Laroia; Junyi Li; Tom Richardson; Xinzhou Wu; Aleksandar Jovicic - Web page: https://patentgrep.com/patent/US8542658B2 ## CPC - H04W 40/244: {using a network of reference devices, e.g. beaconing} - H04L 5/0016: {Time-frequency-code} - H04L 5/0035: {Resource allocation in a cooperative multipoint environment} - H04L 27/261: {Details of reference signals} - H04W 8/005: {Discovery of network devices, e.g. terminals} - H04W 16/14: Spectrum sharing arrangements {between different networks} - H04W 36/16: Performing reselection for specific purposes - H04W 48/20: Selecting an access point - H04W 52/0229: {where the received signal is a wanted signal} - H04W 72/02: Selection of wireless resources by user or terminal - H04W 88/10: adapted for operation in multiple networks, e.g. multi-mode access points - H04J 3/0602: {Systems characterised by the synchronising information used} - H04L 5/0048: {Allocation of pilot signals, i.e. of signals known to the receiver (allocation of control signalling H04L5/0053; use of control signalling H04L5/0091)} - H04L 27/2601: {Multicarrier modulation systems} - H04W 28/04: Error control - H04W 28/18: Negotiating wireless communication parameters - H04W 40/24: Connectivity information management, e.g. connectivity discovery or connectivity update - H04W 48/08: Access restriction or access information delivery, e.g. discovery data delivery (signalling during connection H04W76/00) - H04W 48/16: Discovering, processing access restriction or access information - H04W 52/04: Transmission power control [TPC] - H04W 76/14: Direct-mode setup - H04W 84/042: {Public Land Mobile systems, e.g. cellular systems} - H04W 84/18: Self-organising networks, e.g. ad-hoc networks or sensor networks - H04W 88/02: Terminal devices - H04W 88/04: adapted for relaying to or from another terminal or user - H04W 88/06: adapted for operation in multiple networks {or having at least two operational modes}, e.g. multi-mode terminals - Y02D 30/70: in wireless communication networks - H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72) - H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M) - H04J: MULTIPLEX COMMUNICATION (transmission in general H04B; peculiar to transmission of digital information H04L5/00; systems for the simultaneous or sequential transmission of more than one television signal H04N7/08; in exchanges H04Q11/00; stereophonic systems H04S) - Y02D: CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE ## Abstract Systems and methodologies are described that facilitate sharing bandwidth between a wide area network and a local area peer-to-peer network. The peer-to-peer network may use an air interface technology that is similar to distinct from an air interface technology used in the wide area network. Moreover, the wide area network and the local area peer-to-peer network may utilize distinct sets of parameters. For example, if the wide area network and the peer-to-peer network use OFDM-based air interface technologies, parameters such as tone spacing, symbol time, cyclic prefix, and the like of the two networks may vary. Further, peer-to-peer parameters may be a function of parameters for the wide area network. ## Claims ### Claim 1 A method that facilitates communicating via a shared spectrum, comprising: identifying a wide area network from a received signal; employing a first set of parameters for said wide area network in a wireless spectrum; determining, based upon the identity of the wide area network, local area network parameters to be employed in wireless spectrum used by said identified wide area network, said local area network parameters being a second set of parameters, said second set of parameters including at least one of tone spacing or cyclic prefix duration, at least one parameter in said second set of parameters differing from a parameter in the first set from which said at least one parameter is generated; and employing the second set of parameters for peer to peer communications in a local area peer-to-peer network in the same wireless spectrum used by said wide area network. ### Claim 2 (depends on 1) The method of claim 1, wherein said method is implemented by a mobile wireless terminal. ### Claim 3 (depends on 1) The method of claim 1, wherein an OFDM-based air interface technology is used in the local area peer-to-peer network and a CDMA-based air interface technology is used in the wide area network. ### Claim 4 (depends on 1) The method of claim 1, wherein OFDM-based air interface technologies are used in both the local area peer-to-peer network and the wide area network. ### Claim 5 (depends on 1) The method of claim 1, wherein determining, based upon the identity of the wide area network, local area network parameters includes: determining wide area network parameters associated with the identified wide area network from a lookup table; and deriving parameters for the peer-to-peer network from the wide area network parameters determined from the lookup table. ### Claim 6 (depends on 5) The method of claim 5, wherein the second set of parameters includes a parameter indicating a shorter symbol time, a shorter cyclic prefix and/or a larger tone spacing than is indicated by a parameter in the first set of parameters; and wherein the first set of parameters includes a tone spacing N times larger than a tone spacing included in the second set of parameters, where N is a real number no less than 2. ### Claim 7 (depends on 5) The method of claim 5, wherein the second set of parameters includes a cyclic prefix K times shorter than a disparate cyclic prefix included in the first set of parameters, where K is a real number no less than 2. ### Claim 8 (depends on 1) The method of claim 1, wherein the second set of parameters includes a parameter indicating a shorter cyclic prefix and/or a smaller tone spacing than is indicated by a parameter in the first set of parameters. ### Claim 9 (depends on 1) The method of claim 1, further comprising opportunistically communicating via the local area peer-to-peer network when the wireless spectrum is unutilized or underutilized by the wide area network. ### Claim 10 (depends on 1) The method of claim 1, further comprising: estimating a value of at least one parameter in the first set of parameters used in an air interface of the wide area network; and obtaining the second set of parameters for the local area peer-to-peer network as a function of the estimated value of said at least one parameter. ### Claim 11 (depends on 10) The method of claim 10, further comprising identifying the air interface technology used in the wide area network. ### Claim 12 (depends on 11) The method of claim 11, wherein obtaining the second set of parameters further comprises obtaining the second set of parameters from a lookup table based upon the estimated value of the at least one parameter used in the air interface of the wide area network or the identified air interface technology used in the wide area network. ### Claim 13 (depends on 11) The method of claim 11, wherein obtaining the second set of parameters further comprises calculating at least part of the second set of parameters based upon the estimated value of the at least one parameter used in the air interface of the wide area network or the identified air interface technology used in the wide area network. ### Claim 14 (depends on 10) The method of claim 10, wherein estimating the value of at least one parameter further comprises receiving a Beacon signal associated with the wide area network. ### Claim 15 A wireless communications apparatus, comprising: a memory that retains instructions for controlling the communications apparatus to: identify a wide area network (WAN) from a received signal; employ a first set of parameters for said wide area network in a wireless spectrum; determine, based upon the identity of the wide area network, local area network parameters to be employed in the wireless spectrum used by said wide area network, said local area network parameters being a second set of parameters, said second set of parameters including at least one of tone spacing or cyclic prefix duration, at least one parameter in said second set of parameters differing from a parameter in the first set from which said at least one parameter is generated; and employ the second set of parameters for peer to peer communications in a local area peer-to-peer network in the same wireless spectrum used by said wide area network; and a processor, coupled to the memory, configured to execute the instructions retained in the memory. ### Claim 16 (depends on 15) The wireless communications apparatus of claim 15, wherein the memory further retains instructions for controlling said apparatus to receive a signature signal associated with the wide area network and estimating a value of at least one WAN parameter used in an air interface of the wide area network based upon the signature signal. ### Claim 17 (depends on 16) The wireless communications apparatus of claim 16, wherein the memory further retains instructions for controlling said apparatus to identify the air interface technology used in the wide area network. ### Claim 18 (depends on 17) The wireless communications apparatus of claim 17, wherein the memory further retains a lookup table that includes a plurality of sets of parameter data for the peer-to-peer network that correspond to a plurality of air interface technologies of wide area networks. ### Claim 19 (depends on 18) The wireless communications apparatus of claim 18, wherein the memory further retains instructions for controlling said apparatus to retrieve the parameter data from the lookup table based upon the estimated value of the at least one parameter used in the air interface of the wide area network or the identified air interface technology used in the wide area network. ### Claim 20 (depends on 17) The wireless communications apparatus of claim 17, wherein the memory further retains instructions for controlling said apparatus to determine said parameters as a function of the estimated value of the at least one parameter used in the air interface of the wide area network or the identified air interface technology used in the wide area network. ### Claim 21 (depends on 15) The wireless communications apparatus of claim 15, wherein the memory further retains instructions for controlling said apparatus to communicate via the wide area network and the peer-to-peer network utilizing a common spectrum. ### Claim 22 (depends on 15) The wireless communications apparatus of claim 15, wherein the memory further retain instructions for controlling said apparatus to: determine wide area network parameters associated with the wide area network from a lookup table; and derive parameters for the peer-to-peer network from the wide area network parameters determined from the lookup table. ### Claim 23 (depends on 15) The wireless communications apparatus of claim 15, wherein OFDM-based air interface technologies are used in both the peer-to-peer network and the wide area network. ### Claim 24 (depends on 23) The wireless communications apparatus of claim 23, wherein the second set of parameters to be used for the peer-to-peer network includes a parameter indicating a shorter symbol time, a shorter cyclic prefix and/or a larger tone spacing than is indicated by a parameter in the first set of parameters used for communications in the wide area network. ### Claim 25 (depends on 23) The wireless communications apparatus of claim 23, wherein the second set of parameters to be used for the peer-to-peer network includes a parameter indicating a shorter cyclic prefix and/or a smaller tone spacing than is indicated by a parameter in the first set of parameters used for communications in the wide area network. ### Claim 26 (depends on 15) The wireless communications apparatus of claim 15 wherein said wireless communications apparatus is a mobile wireless terminal that performs both Wide Area Network Communications and Peer-to-Peer communications. ### Claim 27 A wireless communications apparatus that enables communication over a wide area network and a local area peer-to-peer network, comprising: means for identifying a wide area network from a received signal; means for employing a first set of parameters for said wide area network in a wireless spectrum; means for determining, based upon the identified wide area network, local area network parameters to be used in the wireless spectrum used by said identified wide area network, said local area network parameters being a second set of parameters, said second set of parameters including at least one of tone spacing or cyclic prefix duration, at least one parameter in said second set of parameters differing from a parameter in the first set from which said at least one parameter is generated, the second set of parameters being employed for peer-to-peer communications in a local area peer-to-peer network which uses the same wireless spectrum used by said wide area network. ### Claim 28 (depends on 27) The wireless communications apparatus of claim 27, further comprising means for utilizing a shared bandwidth to communicate over the wide area network and the local area peer-to-peer network. ### Claim 29 (depends on 27) The wireless communications apparatus of claim 27, further comprising means for determining an air interface technology associated with the wide area network. ### Claim 30 (depends on 27) The wireless communications apparatus of claim 27, further comprising means for estimating differing parameters to be employed for the wide area network. ### Claim 31 (depends on 27) The wireless communications apparatus of claim 27, wherein said means for determining the local area network parameters to be used for the local area peer-to-peer network includes means for deriving a peer to peer network parameter from a wide area network parameter. ### Claim 32 (depends on 27) The wireless communications apparatus of claim 27, further comprising means for opportunistically communicating via the local area peer-to-peer network when a common spectrum is unutilized or underutilized by the wide area network. ### Claim 33 (depends on 27) The wireless communications apparatus of claim 27, wherein an OFDM-based air interface technology is used in the local area peer-to-peer network and a CDMA-based air interface technology is used in the wide area network. ### Claim 34 (depends on 27) The wireless communications apparatus of claim 27, wherein OFDM-based air interface technologies are used in both the local area peer-to-peer network and the wide area network. ### Claim 35 (depends on 34) The wireless communications apparatus of claim 34, wherein the second set of parameters to be used for the peer-to-peer network include a parameter indicating a shorter symbol time, a shorter cyclic prefix or a larger tone spacing than is indicated by a parameter in the first set of parameters used for communicating in the wide area network. ### Claim 36 (depends on 34) The wireless communications apparatus of claim 34, wherein the second set of parameters to be used for the local area peer-to-peer network include a parameter indicating a shorter cyclic prefix or a smaller tone spacing than is indicated by a parameter in the first set of parameters used for communicating in the wide area network. ### Claim 37 A non-transitory machine-readable medium having stored thereon machine-executable instructions for: identifying a wide area network from a received signal; utilizing a first set of parameters for said wide area network; determining, based upon the identity of the wide area network, local area network parameters to be employed in wireless spectrum used by said identified wide area network, said local area network parameters being a second set of parameters, said second set of parameters including at least one of tone spacing or cyclic prefix duration, at least one parameter in said second set of parameters differing from a parameter in the first set from which said at least one parameter is generated; and utilizing the second set of parameters for peer to peer communications in a local area peer-to-peer network that leverages a common wireless spectrum as used by the wide area network. ### Claim 38 (depends on 37) The non-transitory machine-readable medium of claim 37, wherein an OFDM-based air interface technology is used in the local area peer-to-peer network and a CDMA-based air interface technology is used in the wide area network. ### Claim 39 (depends on 37) The non-transitory machine-readable medium of claim 37, wherein OFDM-based air interface technologies are used in both the local area peer-to-peer network and the wide area network. ### Claim 40 (depends on 39) The non-transitory machine-readable medium of claim 39, wherein the second set of parameters includes a longer symbol time, a shorter cyclic prefix and/or a smaller tone spacing than the first set of parameters. ### Claim 41 (depends on 37) The non-transitory machine-readable medium of claim 37, wherein the machine-executable instructions for determining, based upon the identity of the wide area network, local area network parameters include machine-executable instructions for: determining wide area network parameters associated with the wide area network from a lookup table; and deriving parameters for the peer-to-peer network from the wide area network parameters determined from the lookup table. ### Claim 42 (depends on 41) The non-transitory machine-readable medium of claim 41, wherein the second set of parameters includes a parameter indicating a shorter symbol time, a shorter cyclic prefix and/or a larger tone spacing than is indicated by a parameter in the first set of parameters; and wherein the second set of parameters includes a tone spacing N times smaller than a tone spacing included in the first set of parameters, where N is a real number no less than 2. ### Claim 43 (depends on 41) The non-transitory machine-readable medium of claim 41, wherein the second set of parameters includes a cyclic prefix K times shorter than a disparate cyclic prefix included in the first set of parameters, where K is a real number no less than 2. ### Claim 44 (depends on 37) The non-transitory machine-readable medium of claim 37, further comprising machine-executable instructions for opportunistically transmitting over the local area peer-to-peer network utilizing a spectrum shared with the wide area network. ### Claim 45 (depends on 37) The non-transitory machine-readable medium of claim 37, further comprising machine-executable instructions for estimating a value of at least one parameter in the first set of parameters used in an air interface of the wide area network and for obtaining the second set of parameters for the local area peer-to-peer network as a function of the estimated parameter. ### Claim 46 (depends on 45) The non-transitory machine-readable medium of claim 45, further comprising machine-executable instructions for identifying the air interface technology used in the wide area network. ### Claim 47 (depends on 46) The non-transitory machine-readable medium of claim 46, further comprising machine-executable instructions for obtaining the second set of parameters from a lookup table based upon the estimated value of the at least one parameter used in the air interface of the wide area network or the identified air interface technology used in the wide area network. ### Claim 48 (depends on 46) The non-transitory machine-readable medium of claim 46, further comprising machine-executable instructions for calculating at least part of the second set of parameters based upon the estimated value of the at least one parameter used in the air interface of the wide area network or the identified air interface technology used in the wide area network. ### Claim 49 (depends on 45) The non-transitory machine-readable medium of claim 45, further comprising machine-executable instructions for receiving a Beacon signal associated with the wide area network upon which to estimate the value of at least one parameter. ### Claim 50 In a wireless communication system, an apparatus comprising: a processor configured to: identify a wide area network from a received signal; employing a first set of parameters for said wide area network in a wireless spectrum; determine, based upon the identity of the identified wide area network, local area network parameters to be employed in said wireless spectrum used by said identified wide area network, said local area network parameters being a second set of parameters, said second set of parameters including at least one of tone spacing or cyclic prefix duration, at least one parameter in said second set of parameters differing from a parameter in the first set from which said at least one parameter is generated; and employ the second set of parameters for peer to peer communications in a local area peer-to-peer network in the same wireless spectrum used by said wide area network.