Method and apparatus for reuse of WAN infrastructure resources in a wireless peer-to-peer (P2P) network
AssigneeQUALCOMM Incorporated
InventorsJunyi Li, Xinzhou Wu, Thomas Richardson
Life of this patent
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Abstract
To make efficient use of a frequency spectrum, a peer-to-peer network shares a wide area network (WAN) frequency spectrum as well as a time-frequency structure of the WAN, where the time-frequency structure includes a set of tones and symbols. A first wireless terminal monitors the time-frequency structure of the WAN to determine which subsets of tone-symbols are unused for WAN and/or other peer-to-peer connections. Then, the first wireless terminal selects and uses an unused subset of tone-symbols within the time-frequency structure for its peer-to-peer connection with a second wireless terminal.
Claims42
A method for operating a first wireless device communicating with a second wireless device within a wireless peer-to-peer communication network, the wireless peer-to-peer communication network sharing a frequency spectrum with a wireless wide area network, comprising:
- partitioning a time frequency structure into a plurality of subsets of tone-symbols, the time frequency structure including a plurality of orthogonal frequency-division multiplexing (OFDM) symbols and each of the plurality of OFDM symbols including a plurality of tones, a tone-symbol being one tone in one of the plurality of OFDM symbols;
- selecting a first plurality of tone-symbols from the tone-symbols in said plurality of OFDM symbols, said first plurality of tone-symbols partially overlapping tone-symbols used by said wide area network for wide area network signal transmission during a first time period and including at least one tone-symbol which is not used by said wide area network for wide area network signal transmission during said first time period;
- and
- transmitting a peer-to-peer signal to the second device using the first plurality of tone-symbols during said first time period.
A method for operating a first wireless device communicating with a second wireless device within a wireless peer-to-peer communication network, the wireless peer-to-peer communication network sharing a frequency spectrum with a wireless wide area network, comprising:
- partitioning a time frequency structure into a plurality of subsets of tone-symbols, the time frequency structure including a plurality of orthogonal frequency-division multiplexing (OFDM) symbols and each of the plurality of OFDM symbols including a plurality of tones, a tone-symbol being one tone in one of the plurality of OFDM symbols;
- selecting a first plurality of the subsets of tone-symbols;
- transmitting a signal to the second device using the selected subset of the plurality of subsets of tone-symbols;
- monitoring the shared spectrum to derive symbol timing information of a signal transmitted in the wireless wide area network;
- and
- adjusting the transmission timing as a function of the derived symbol timing information.
A first device configured to communicate with a second device within a wireless peer-to-peer communication network, the wireless peer-to-peer communication network sharing a frequency spectrum with a wireless wide area network (WAN), comprising:
- a transmitter and receiver for establishing a wireless peer-to-peer communication connection with the second device;
- and
- a processing circuit adapted to reuse a time-frequency structure of the WAN for communications over the peer-to-peer communication connection with the second device, the processing circuit configured to:
- partition a time frequency structure into a plurality of subsets of tone-symbols, the time frequency structure including a plurality of orthogonal frequency-division multiplexing (OFDM) symbols and each of the plurality of OFDM symbols including a plurality of tones, a tone-symbol being one tone in one of the plurality of OFDM symbols;
- select a first plurality of tone-symbols from the tone-symbols in said plurality of OFDM symbols, said first plurality of tone-symbols partially overlapping tone-symbols used by said wide area network for wide area network signal transmission during a first time period and including at least one tone-symbol which is not used by said wide area network for wide area network signal transmission during said first time period;
- and
- transmit a peer to peer signal to the second device using the first plurality of tone-symbols during said first time period.
A first device configured to communicate with a second device within a wireless peer-to-peer communication network, the wireless peer-to-peer communication network sharing a frequency spectrum with a wireless wide area network (WAN), comprising:
- means for partitioning a time frequency structure into a plurality of subsets of tone-symbols, the time frequency structure including a plurality of orthogonal frequency-division multiplexing (OFDM) symbols and each of the plurality of OFDM symbols including a plurality of tones, a tone-symbol being one tone in one of the plurality of OFDM symbols;
- means for selecting a first plurality of tone-symbols from the tone-symbols in said plurality of OFDM symbols, said first plurality of tone-symbols partially overlapping tone-symbols used by said wide area network for wide area network signal transmission during a first time period and including at least one tone-symbol which is not used by said wide area network for wide area network signal transmission during said first time period;
- and
- means for transmitting a peer to peer signal to the second device using the first plurality of tone-symbols.
A circuit for reusing a time-frequency structure of a wide area network (WAN) for communications over a peer-to-peer communication connection between a first device and a second device, where the wireless peer-to-peer communication connection shares a frequency spectrum with the WAN, wherein the circuit operates in the first device and is adapted to:
- partition a time frequency structure into a plurality of subsets of tone-symbols, the time frequency structure including a plurality of orthogonal frequency-division multiplexing (OFDM) symbols and each of the plurality of OFDM symbols including a plurality of tones, a tone-symbol being one tone in one of the plurality of OFDM symbols;
- select a first plurality of tone-symbols from the tone-symbols in said plurality of OFDM symbols, said first plurality of tone-symbols partially overlapping tone-symbols used by said wide area network for wide area network signal transmission during a first time period and including at least one tone-symbol which is not used by said wide area network for wide area network signal transmission during said first time period;
- and
- transmit a peer to peer signal to the second device using the first plurality of tone-symbols.
A non-transitory machine-readable medium comprising instructions for a first device to communicate with a second device within a wireless peer-to-peer communication network, the wireless peer-to-peer communication network sharing a frequency spectrum with a wireless wide area network (WAN), which when executed by a processor causes the processor to:
- partition a time frequency structure into a plurality of subsets of tone-symbols, the time frequency structure including a plurality of orthogonal frequency-division multiplexing (OFDM) symbols and each of the plurality of OFDM symbols including a plurality of tones, a tone-symbol being one tone in one of the plurality of OFDM symbols;
- select a first plurality of tone-symbols from the tone-symbols in said plurality of OFDM symbols, said first plurality of tone-symbols partially overlapping tone-symbols used by said wide area network for wide area network signal transmission during a first time period and including at least one tone-symbol which is not used by said wide area network for wide area network signal transmission during said first time period;
- and
- transmit a peer to peer signal to the second device using the first plurality of tone-symbols.
A method for operating a second wireless device communicating with a first wireless device within a wireless peer to peer communication network, comprising:
- receiving a composite signal in a frequency spectrum shared between the peer-to-peer communication network and a wireless wide area network, the composite signal including an intended signal transmitted from the first device to the second device and an interfering signal transmitted from a first wireless wide area device to a second wireless wide area device of the wide area network, and the intended signal including a plurality of OFDM symbols and each of the plurality of OFDM symbols including a plurality of tones;
- retrieving modulation symbols from the received composite signal based on a time frequency structure determined by the tones and OFDM symbols of the intended signal, one modulation symbol being retrieved one tone-symbol, a tone-symbol being one tone in one of the plurality of OFDM symbols;
- partitioning the retrieved modulation symbols into a plurality of subsets, each of the retrieved modulation symbol subsets corresponding to the modulation symbols retrieved in a corresponding subset of tone-symbols in the time frequency structure;
- determining the interference strength of each of the retrieved modulation symbol subsets;
- and
- wherein the interfering signal also includes a plurality of OFDM symbols and each of the plurality of OFDM symbols including a plurality of tones, and wherein the symbol duration of an OFDM symbol of the intended signal is substantially the same as the symbol duration of an OFDM symbol of the interfering signal and the tone spacing of the intended signal is substantially the same as the tone spacing of the interfering signal.
A second device configured to communicate with a first device within a wireless peer-to-peer communication network, comprising:
- a transmitter and receiver for establishing a wireless peer-to-peer communication connection with the second device;
- and
- a processing circuit adapted to reuse a time-frequency structure of the WAN for communications over the peer-to-peer communication connection with the second device, the processing circuit configured to:
- receive a composite signal in a frequency spectrum shared between the peer-to-peer communication network and a wireless wide area network, the composite signal including an intended signal transmitted from the first device to the second device and an interfering signal transmitted from a first wireless wide area device to a second wireless wide area device of the wide area network, and the intended signal including a plurality of OFDM symbols and each of the plurality of OFDM symbols including a plurality of tones;
- retrieve modulation symbols from the received composite signal based on a time frequency structure determined by the tones and OFDM symbols of the intended signal, one modulation symbol being retrieved one tone-symbol, a tone-symbol being one tone in one of the plurality of OFDM symbols;
- partition the retrieved modulation symbols into a plurality of subsets, each of the retrieved modulation symbol subsets corresponding to the modulation symbols retrieved in a corresponding subset of tone-symbols in the time frequency structure;
- determine the interference strength of each of the retrieved modulation symbol subsets;
- and
- wherein the interfering signal also includes a plurality of OFDM symbols and each of the plurality of OFDM symbols including a plurality of tones, and wherein the symbol duration of an OFDM symbol of the intended signal is substantially the same as the symbol duration of an OFDM symbol of the interfering signal and the tone spacing of the intended signal is substantially the same as the tone spacing of the interfering signal.
A second device configured to communicate with a first device within a wireless peer-to-peer communication network, comprising:
- means for receiving a composite signal in a spectrum shared between the peer-to-peer communication network and a wireless wide area network, the composite signal including an intended signal transmitted from the first device to the second device and an interfering signal transmitted from a first wireless wide area device to a second wireless wide area device of the wide area network, and the intended signal including a plurality of OFDM symbols and each of the plurality of OFDM symbols including a plurality of tones;
- means for retrieving modulation symbols from the received composite signal based on a time frequency structure determined by the tones and OFDM symbols of the intended signal, one modulation symbol being retrieved one tone-symbol, a tone-symbol being one tone in one of the plurality of OFDM symbols;
- means for partitioning the retrieved modulation symbols into a plurality of subsets, each of the retrieved modulation symbol subsets corresponding to the modulation symbols retrieved in a corresponding subset of tone-symbols in the time frequency structure;
- means for determining the interference strength of each of the retrieved modulation symbol subsets;
- and
- wherein the interfering signal also includes a plurality of OFDM symbols and each of the plurality of OFDM symbols including a plurality of tones, and wherein the symbol duration of an OFDM symbol of the intended signal is substantially the same as the symbol duration of an OFDM symbol of the interfering signal and the tone spacing of the intended signal is substantially the same as the tone spacing of the interfering signal.
A circuit for reusing a time-frequency structure of a wide area network (WAN) for communications over a peer-to-peer communication connection between a first device and a second device, wherein the circuit operates in the second device and is adapted to:
- receive a composite signal in a frequency spectrum shared between the peer-to-peer communication network and a wireless wide area network, the composite signal including an intended signal transmitted from the first device to the second device and an interfering signal transmitted from a first wireless wide area device to a second wireless wide area device of the wide area network, and the intended signal including a plurality of OFDM symbols and each of the plurality of OFDM symbols including a plurality of tones;
- retrieve modulation symbols from the received composite signal based on a time frequency structure determined by the tones and OFDM symbols of the intended signal, one modulation symbol being retrieved one tone-symbol, a tone-symbol being one tone in one of the plurality of OFDM symbols;
- partition the retrieved modulation symbols into a plurality of subsets, each of the retrieved modulation symbol subsets corresponding to the modulation symbols retrieved in a corresponding subset of tone-symbols in the time frequency structure;
- determine the interference strength of each of the retrieved modulation symbol subsets;
- and
- wherein the interfering signal also includes a plurality of OFDM symbols and each of the plurality of OFDM symbols including a plurality of tones, and wherein the symbol duration of an OFDM symbol of the intended signal is substantially the same as the symbol duration of an OFDM symbol of the interfering signal and the tone spacing of the intended signal is substantially the same as the tone spacing of the interfering signal.
A non-transitory machine-readable medium comprising instructions for a second device to communicate with a first device within a wireless peer-to-peer communication network, which when executed by a processor causes the processor to:
- receive a composite signal in a frequency spectrum shared between the peer-to-peer communication network and a wireless wide area network, the composite signal including an intended signal transmitted from the first device to the second device and an interfering signal transmitted from a first wireless wide area device to a second wireless wide area device of the wide area network, and the intended signal including a plurality of OFDM symbols and each of the plurality of OFDM symbols including a plurality of tones;
- retrieve modulation symbols from the received composite signal based on a time frequency structure determined by the tones and OFDM symbols of the intended signal, one modulation symbol being retrieved one tone-symbol, a tone-symbol being one tone in one of the plurality of OFDM symbols;
- partition the retrieved modulation symbols into a plurality of subsets, each of the retrieved modulation symbol subsets corresponding to the modulation symbols retrieved in a corresponding subset of tone-symbols in the time frequency structure;
- determine the interference strength of each of the retrieved modulation symbol subsets;
- and
- wherein the interfering signal also includes a plurality of OFDM symbols and each of the plurality of OFDM symbols including a plurality of tones, and wherein the symbol duration of an OFDM symbol of the intended signal is substantially the same as the symbol duration of an OFDM symbol of the interfering signal and the tone spacing of the intended signal is substantially the same as the tone spacing of the interfering signal.
A first wireless device communicating with a second wireless device within a wireless peer-to-peer communication network, the wireless peer-to-peer communication network sharing a frequency spectrum with a wireless wide area network, the first wireless device comprising:
- means for partitioning a time frequency structure into a plurality of subsets of tone-symbols, the time frequency structure including a plurality of orthogonal frequency-division multiplexing (OFDM) symbols and each of the plurality of OFDM symbols including a plurality of tones, a tone-symbol being one tone in one of the plurality of OFDM symbols;
- means for selecting a first plurality of the subsets of tone-symbols;
- means for transmitting a signal to the second device using the selected subset of the plurality of subsets of tone-symbols;
- means for monitoring the shared spectrum to derive symbol timing information of a signal transmitted in the wireless wide area network;
- and
- means for adjusting the transmission timing as a function of the derived symbol timing information.
A circuit for reusing a time-frequency structure of a wide area network (WAN) for communications over a peer-to-peer communication connection between a first device and a second device, where the wireless peer-to-peer communication connection shares a frequency spectrum with the WAN, wherein the circuit operates in the first device and is adapted to:
- partition a time frequency structure into a plurality of subsets of tone-symbols, the time frequency structure including a plurality of orthogonal frequency-division multiplexing (OFDM) symbols and each of the plurality of OFDM symbols including a plurality of tones, a tone-symbol being one tone in one of the plurality of OFDM symbols;
- select a first plurality of the subsets of tone-symbols;
- transmit a signal to the second device using the selected subset of the plurality of subsets of tone-symbols;
- monitor the shared spectrum to derive symbol timing information of a signal transmitted in the wireless wide area network;
- and
- adjust the transmission timing as a function of the derived symbol timing information.
A non-transitory machine-readable medium comprising instructions for a first device to communicate with a second device within a wireless peer-to-peer communication network, the wireless peer-to-peer communication network sharing a frequency spectrum with a wireless wide area network (WAN), which when executed by a processor causes the processor to:
- partition a time frequency structure into a plurality of subsets of tone-symbols, the time frequency structure including a plurality of orthogonal frequency-division multiplexing (OFDM) symbols and each of the plurality of OFDM symbols including a plurality of tones, a tone-symbol being one tone in one of the plurality of OFDM symbols;
- select a first plurality of the subsets of tone-symbols;
- transmit a signal to the second device using the selected subset of the plurality of subsets of tone-symbols;
- monitor the shared spectrum to derive symbol timing information of a signal transmitted in the wireless wide area network;
- and
- adjust the transmission timing as a function of the derived symbol timing information.
Dependencies are inferred from the claim text.