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US 8,477,801 B2Granted
Backoff procedure for post downlink SDMA operation
AssigneeQUALCOMM Incorporated
InventorsVinay Sridhara, Josephine Pui Kwan Chu, Santosh P. Abraham
Life of this patent
Estimating the term…
Abstract
Certain aspects of the present disclosure relate to a technique for decreasing a probability of post-backoff collisions that occur during uplink transmissions from multiple user stations (STAs) following completion of downlink transmission from an access point to the STAs.
Claims83
A method for wireless communications, comprising:
- determining a backoff value for each of a plurality of apparatuses that are scheduled to receive simultaneous transmissions, wherein the backoff values are determined, at least in part, based on a number of the apparatuses and wherein the backoff values indicate how long the apparatuses should wait after receiving the simultaneous transmissions before transmitting;
- transmitting the determined backoff values to the apparatuses;
- and
- transmitting the simultaneous transmissions to the plurality of apparatuses after transmitting the backoff values.
1 more element
An apparatus for wireless communications, comprising:
- a processing system configured to determine a backoff value for each of a plurality of apparatuses that are scheduled to receive simultaneous transmissions, wherein the backoff values are determined, at least in part, based on a number of the apparatuses and wherein the backoff values indicate how long the apparatuses should wait after receiving the simultaneous transmissions before transmitting;
- and
- a transmitter configured to transmit the determined backoff values to the apparatuses and to transmit the simultaneous transmissions to the plurality of apparatuses after transmission of the backoff values.
An apparatus for wireless communications, comprising:
- means for determining a backoff value for each of a plurality of apparatuses that are scheduled to receive simultaneous transmissions, wherein the backoff values are determined, at least in part, based on a number of the apparatuses and wherein the backoff values indicate how long the apparatuses should wait after receiving the simultaneous transmissions before transmitting;
- means for transmitting the determined backoff values to the apparatuses;
- and
- means for transmitting the simultaneous transmissions to the plurality of apparatuses after transmission of the backoff values.
1 more element
A computer-program product for wireless communications, comprising a computer-readable storage device comprising instructions executable to:
- determine a backoff value for each of a plurality of apparatuses that are scheduled to receive simultaneous transmissions, wherein the backoff values are determined, at least in part, based on a number of the apparatuses and wherein the backoff values indicate how long the apparatuses should wait after receiving the simultaneous transmissions before transmitting;
- transmit the determined backoff values to the apparatuses;
- and
- transmit the simultaneous transmissions to the plurality of apparatuses after transmission of the backoff values.
1 more element
An access point, comprising:
- at least one antenna;
- a processing system configured to determine a backoff value for each of a plurality of wireless nodes that are scheduled to receive simultaneous transmissions, wherein the backoff values are determined, at least in part, based on a number of the wireless nodes and wherein the backoff values indicate how long the wireless nodes should wait after receiving the simultaneous transmissions before transmitting;
- and
- a transmitter configured to transmit via the at least one antenna the determined backoff values to the wireless nodes and to transmit the simultaneous transmissions to the plurality of wireless nodes after transmission of the backoff values.
1 more element
A method for wireless communications, comprising:
- receiving, at an apparatus of a plurality of apparatuses, a message transmitted from another apparatus to the apparatuses, the message comprising backoff values, wherein each backoff value is assigned to one of the apparatuses;
- receiving data from the other apparatus;
- in response to the received data, transmitting an acknowledgement to the other apparatus;
- and
- refraining from transmitting after transmission of the acknowledgment for a time period indicated by the backoff value assigned to the apparatus.
2 more elements
An apparatus for wireless communications, comprising:
- a receiver configured to receive, at the apparatus of a plurality of apparatuses, a message transmitted from another apparatus to the apparatuses, the message comprising backoff values, wherein each backoff value is assigned to one of the apparatuses, and further configured to receive data from the other apparatus;
- and
- a transmitter configured to transmit, in response to the received data, an acknowledgment to the other apparatus and to refrain from transmitting after transmission of the acknowledgement for a time period indicated by the backoff value assigned to the apparatus.
An apparatus for wireless communications, comprising:
- means for receiving, at the apparatus of a plurality of apparatuses, a message transmitted from another apparatus to the apparatuses, the message comprising backoff values, wherein each backoff value is assigned to one of the apparatuses;
- means for receiving data from the other apparatus;
- means for transmitting, in response to the received data, an acknowledgement to the other apparatus;
- and
- means for refraining from transmitting after transmission of the acknowledgement for a time period indicated by the backoff value assigned to the apparatus.
2 more elements
A computer-program product for wireless communications, comprising a computer-readable storage device comprising instructions executable to:
- receive, at an apparatus of a plurality of apparatuses, a message transmitted from another apparatus to the apparatuses, the message comprising backoff values, wherein each backoff value is assigned to one of the apparatuses;
- receive data from the other apparatus;
- transmit, in response to the received data, an acknowledgement to the other apparatus;
- and
- refrain from transmitting after transmission of the acknowledgement for a time period indicated by the backoff value assigned to the apparatus.
2 more elements
A wireless node, comprising:
- at least one antenna;
- a receiver configured to receive via the at least one antenna, at the wireless node of a plurality of wireless nodes, a message transmitted from an access point to the wireless nodes, the message comprising backoff values, wherein each backoff value is assigned to one of the wireless nodes, and further configured to receive data from the other apparatus;
- and
- a transmitter configured to transmit, in response to the received data, an acknowledgment to the other apparatus and to refrain from transmitting after transmission of the acknowledgement for a time period indicated by the backoff value assigned to the apparatus.
1 more element
A method for wireless communications, comprising:
- transmitting a control message to each of a plurality of apparatuses that are scheduled to receive simultaneous transmissions;
- receiving an acknowledgement message from each of the apparatuses, wherein the acknowledgement messages were transmitted after receiving the control message at the apparatuses;
- and
- in response to the acknowledgement messages, transmitting, to the apparatuses, a backoff timing message with backoff values, wherein the backoff values indicate how long the apparatuses should wait after receiving the simultaneous transmissions before transmitting.
1 more element
An apparatus for wireless communications, comprising:
- a transmitter configured to transmit a control message to each of a plurality of apparatuses that are scheduled to receive simultaneous transmissions;
- and
- a receiver configured to receive an acknowledgement message from each of the apparatuses, wherein the acknowledgement messages were transmitted after receiving the control message at the apparatuses, wherein
- the transmitter is also configured to transmit, to the apparatuses in response to the acknowledgement messages, a backoff timing message with backoff values, wherein the backoff values indicate how long the apparatuses should wait after receiving the simultaneous transmissions before transmitting.
1 more element
An apparatus for wireless communications, comprising:
- means for transmitting a control message to each of a plurality of apparatuses that are scheduled to receive simultaneous transmissions;
- and
- means for receiving an acknowledgement message from each of the apparatuses, wherein the acknowledgement messages were transmitted after receiving the control message at the apparatuses, wherein
- the means for transmitting is further configured to transmit, to the apparatuses in response to the acknowledgement messages, a backoff timing message with backoff values, wherein the backoff values indicate how long the apparatuses should wait after receiving the simultaneous transmissions before transmitting.
1 more element
A computer-program product for wireless communications, comprising a computer-readable storage device comprising instructions executable to:
- transmit a control message to each of a plurality of apparatuses that are scheduled to receive simultaneous transmissions;
- receive an acknowledgement message from each of the apparatuses, wherein the acknowledgement messages were transmitted after receiving the control message at the apparatuses;
- and
- transmit, to the apparatuses in response to the acknowledgement messages, a backoff timing message with backoff values, wherein the backoff values indicate how long the apparatuses should wait after receiving the simultaneous transmissions before transmitting.
1 more element
An access point, comprising:
- at least one antenna;
- a transmitter configured to transmit via the at least one antenna a control message to each of a plurality of wireless nodes that are scheduled to receive simultaneous transmissions;
- and
- a receiver configured to receive via the at least one antenna an acknowledgement message from each of the wireless nodes, wherein the acknowledgement messages were transmitted after receiving the control message at the wireless nodes, wherein
- the transmitter is also configured to transmit, to the wireless nodes in response to the acknowledgement messages, a backoff timing message with backoff values, wherein the backoff values indicate how long the wireless nodes should wait after receiving the simultaneous transmissions before transmitting.
2 more elements
Dependencies are inferred from the claim text.