Slotted OFDMA based random access
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, by the access point, a control message comprising a parameter indicating start of an uplink multiuser random access transmission opportunity (RA-TXOP) during which multiple of the plurality of stations are permitted to attempt uplink transmissions using orthogonal frequency division multiplexing access (OFDMA);
receiving a number of response messages from the multiple stations during a random access slot in the RA-TXOP; and
transmitting, based on identities of stations that sent the response messages, an acknowledgement message identifying which of the multiple stations have succeeded and/or are allowed to transmit in an upcoming arbitrated contention-free transmission opportunity,wherein the control message further includes an acknowledgement policy parameter having a first value or a second value different from the first value, the first value indicating defering sending the acknowledgement message to an end of the random access slot and the second value indicating sending the acknowledgement message immediately after the response message.
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Abstract
Access to a wireless medium is controlled based on contention arbitration. A certain number of wireless devices are allowed by an access point to contend for a transmission opportunity. A trigger frame is used to communicate access opportunities to multiple devices. A beacon transmission may additionally be used for communication of access opportunities.
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Citations
28 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, by the access point, a control message comprising a parameter indicating start of an uplink multiuser random access transmission opportunity (RA-TXOP) during which multiple of the plurality of stations are permitted to attempt uplink transmissions using orthogonal frequency division multiplexing access (OFDMA); receiving a number of response messages from the multiple stations during a random access slot in the RA-TXOP; and transmitting, based on identities of stations that sent the response messages, an acknowledgement message identifying which of the multiple stations have succeeded and/or are allowed to transmit in an upcoming arbitrated contention-free transmission opportunity, wherein the control message further includes an acknowledgement policy parameter having a first value or a second value different from the first value, the first value indicating defering sending the acknowledgement message to an end of the random access slot and the second value indicating sending the acknowledgement message immediately after the response message. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. An apparatus for controlling operation of a wireless network comprising an access point and a plurality of stations, comprising:
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a memory that stores instructions; and a processor that reads the instructions from the memory and implements a method, the instructions comprising; instructions for transmitting, by the access point, a control message comprising a parameter indicating start of an uplink multiuser random access transmission opportunity (RA-TXOP) during which multiple of the plurality of stations are permitted to attempt uplink transmissions using orthogonal frequency division multiplexing access (OFDMA); instructions for receiving a number of response messages at a random access slot in the RA-TXOP; and instructions for transmitting, based on identities of stations that sent the number of response messages, an acknowledgement message identifying stations allowed to transmit in an extended TXOP, wherein the control message further includes an acknowledgement policy parameter having a first value or a second value different from the first value, the first value indicating defering sending the acknowledgement message to an end of the random access slot and the second value indicating sending the acknowledgement message immediately after the response message. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20)
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21. A method of controlling operation of a wireless network comprising an access point and a plurality of wireless stations, comprising:
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receiving, by a wireless station, a control message comprising a parameter indicating start of an uplink multiuser random access transmission opportunity (RA-TXOP) during which multiple of the plurality of stations are permitted to attempt uplink transmissions using orthogonal frequency division multiplexing access (OFDMA); transmitting, by the wireless station, a response message at a random access slot specified in the RA-TXOP; receiving, for the response message, an acknowledgement message identifying granting permission to transmit in an extended TXOP; and transmitting user data in the extended TXOP in accordance with the received acknowledgement message, wherein the control message further includes an acknowledgement policy parameter having a first value or a second value different from the first value, the first value indicating defering sending the acknowledgement message to an end of the random access slot and the second value indicating sending the acknowledgement message immediately after the response message. - View Dependent Claims (22, 23)
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24. An apparatus for controlling operation of a wireless network comprising an access point and a plurality of stations, comprising:
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a memory that stores instructions; and a processor that reads the instructions from the memory and implements a method, the instructions comprising; instructions for receiving, by a wireless station, a control message comprising a parameter indicating start of an uplink multiuser random access transmission opportunity (RA-TXOP) during which multiple of the plurality of stations are permitted to attempt uplink transmissions using orthogonal frequency division multiplexing access (OFDMA); instructions for transmitting, by the wireless station, a response message at a random access slot specified in the RA-TXOP; instructions for receiving, for the response message, an acknowledgement message identifying granting permission to transmit in an extended TXOP; and instructions for transmitting user data in the extended TXOP in accordance with the received acknowledgement message, wherein the control message further includes an acknowledgement policy parameter having a first value or a second value different from the first value, the first value indicating defering sending the acknowledgement message to an end of the random access slot and the second value indicating sending the acknowledgement message immediately after the response message. - View Dependent Claims (25, 26)
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27. A wireless communication network comprising an access point and multiple wireless stations,
wherein the access point stores in a first memory instructions causing the access point to: -
transmit a control message comprising a parameter indicating start of an uplink multiuser random access transmission opportunity (RA-TXOP) during which multiple of the plurality of stations are permitted to attempt uplink transmissions using orthogonal frequency division multiplexing access (OFDMA); receive a number of response messages from the multiple stations during a random access slot in the RA-TXOP; and transmit, based on identities of stations that sent the response messages, an acknowledgement message identifying which of the multiple stations have succeeded and/or are allowed to transmit in an upcoming arbitrated contention-free transmission opportunity; and wherein each of the plurality of wireless stations store in a second memory instructions causing each of the plurality of wireless station to; receive the control message; transmit a corresponding response message at a random access slot specified in the RA-TXOP; receive an acknowledgement message identifying granting permission to transmit in an extended TXOP; and transmitting user data in the extended TXOP in accordance with the received acknowledgement message, wherein the control message further includes an acknowledgement policy parameter having a first value or a second value different from the first value, the first value indicating defering sending the acknowledgement message to an end of the random access slot and the second value indicating sending the acknowledgement message immediately after the response message. - View Dependent Claims (28)
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Specification