Contention arbitration using code division multiplexing
First Claim
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1. A method of controlling operation of a wireless network comprising an access point and a plurality of stations, comprising:
- transmitting a first message comprising a parameter indicative of a set of stations authorized to contend for an enhanced transmission opportunity (TXOP);
receiving a first number of contention requests having at least some overlap in time domain and frequency domain, wherein each of the first number of contention requests includes a first special preamble and one or more orthogonal contention field symbols;
monitoring a wireless channel for the first special preamble in each of the first number of content contention requests, wherein the first special preamble includes a signature symbol to identify and allow decoding of the one or more orthogonal contention field symbols;
decoding the one or more orthogonal contention field symbols of a contention request when the one or more orthogonal contention field symbols are identified by the first special preamble of the contention request;
performing contention resolution of the first number of transmission requests using the one or more orthogonal contention field symbols extracted from the first number of contention requests; and
transmitting, based on the contention resolution, a second message identifying stations allowed to transmit in the enhanced TXOP.
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Abstract
Access to a wireless medium is controlled based on contention arbitration. A certain number of wireless devices are allowed to contend for a transmission opportunity. Requests from these wireless devices are processed based on codes contained in the requests. Winning wireless devices are given access to the wireless medium by transmitting a contention arbitration message. In some implementation, codes in the request are selected from an orthogonal or pseudo orthogonal code set.
17 Citations
32 Claims
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1. A method of controlling operation of a wireless network comprising an access point and a plurality of stations, comprising:
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transmitting a first message comprising a parameter indicative of a set of stations authorized to contend for an enhanced transmission opportunity (TXOP); receiving a first number of contention requests having at least some overlap in time domain and frequency domain, wherein each of the first number of contention requests includes a first special preamble and one or more orthogonal contention field symbols; monitoring a wireless channel for the first special preamble in each of the first number of content contention requests, wherein the first special preamble includes a signature symbol to identify and allow decoding of the one or more orthogonal contention field symbols; decoding the one or more orthogonal contention field symbols of a contention request when the one or more orthogonal contention field symbols are identified by the first special preamble of the contention request; performing contention resolution of the first number of transmission requests using the one or more orthogonal contention field symbols extracted from the first number of contention requests; and transmitting, based on the contention resolution, a second message identifying stations allowed to transmit in the enhanced TXOP. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. An apparatus for controlling operation of a wireless network comprising an access point and a plurality of stations, comprising:
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transmission circuitry that transmits a first message comprising a parameter indicative of a set of stations authorized to contend for an enhanced transmission opportunity (TXOP); reception circuitry that receives a first number of contention requests having at least some overlap in a time domain and a frequency domain, wherein each of the first number of contention requests includes a first special preamble and one or more orthogonal contention field symbols; a special preamble monitoring module that monitors a wireless channel for the first special preamble in each of the first number of contention requests, wherein the first special preamble includes a signature symbol to identify and allow decoding of the one or more orthogonal contention field symbols; an orthogonal contention field decoder module that decodes the one or more orthogonal contention field symbols when the one or more orthogonal contention field symbols are identified by the first special preamble of the contention request; a contention resolution module that performs contention resolution of the first number of transmission requests using the one or more orthogonal contention field symbols extracted from the first number of contention requests; and wherein the transmission circuitry further transmits, based on the contention resolution, a second message identifying stations allowed to transmit in the enhanced TXOP. - View Dependent Claims (13, 14, 15, 16)
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17. A wireless communication method implemented at a wireless device, comprising:
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determining whether the wireless device is permitted to contend for an upcoming transmission opportunity (TXOP); transmitting, when permitted according to the determining, a contention request comprising a first special preamble and an orthogonal contention field, wherein the first special preamble includes a signature symbol to identify the orthogonal contention field; receiving a contention arbitration message in response to the contention request, the contention arbitration message including a second special preamble and a reference field, wherein the reference field includes references to one or more orthogonal contention fields of a list of wireless devices and is indicative of a transmission opportunity for the list of wireless devices; determining whether the transmission opportunity was granted in the contention arbitration message by detecting whether the reference field includes a reference to the orthogonal contention field used by the wireless device; and transmitting data upon determination of grant of the transmission opportunity. - View Dependent Claims (18, 19, 20, 21, 22, 23, 24, 25)
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26. A wireless communication apparatus, comprising:
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a memory, a processor, a transmitter circuit and a receiver circuit, wherein the processor; reads instructions from the memory and determines whether the wireless device is permitted to contend for an upcoming transmission opportunity (TXOP); causes, when permitted, the transmitter circuit to transmit a contention request comprising a first special preamble and a contention code, wherein the first special preamble includes a signature symbol to identify the contention code; wherein the receiver circuit receives a contention arbitration message in response to the contention request, the contention arbitration message including a second special preamble and a reference field, wherein the reference field includes references to one or more contention codes of a list of wireless devices and is indicative of a transmission opportunity for the list of wireless devices; wherein the processor further determines whether the transmission opportunity was granted in the contention arbitration message by detecting whether the reference field includes a reference to the contention code used by the wireless device; and wherein the transmitter circuit transmits data upon determination of grant of the transmission opportunity. - View Dependent Claims (27, 28, 29, 30, 31, 32)
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Specification