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US 9,854,469 B2Granted
Supporting a large number of devices in wireless communications
AssigneeInterDigital Patent Holdings, Inc.
InventorsXiaofei Wang, Lei Wang, Guodong Zhang, Sudheer A. Grandhi
Life of this patent
Estimating the term…
Abstract
A method for receiving a backoff value at a wireless station is presented. A traffic indication map is received at the station, wherein a backoff number is implicitly assigned to the station based on a position of the station within the traffic indication map. The backoff value is determined by multiplying the backoff number by a predetermined time value.
Claims14
A method to provide access to a medium, the method comprising:
- receiving a time value at a wireless station;
- receiving a traffic indication map (TIM) element at the wireless station, wherein the TIM element comprises bits mapped to an association identifier (AID) of the wireless station;
- on a condition that an indication for accessing a channel in a time interval for wireless stations having AIDs associated with a positive indication in the TIM element is received at the wireless station, determining a backoff number for the wireless station as a function of an index of the AID of the wireless station;
- on a condition that the indication is not received at the wireless station, determining the backoff number for the wireless station as a function of the AID of the wireless station;
- and
- determining a medium access backoff time for the wireless station by multiplying the backoff number by the time value.
3 more elements
A wireless station, comprising:
- a transceiver configured to receive a time value and a traffic indication map (TIM) element, wherein the TIM element comprises bits mapped to an association identifier (AID) of the wireless station;
- and
- a processor in communication with the transceiver, the processor configured to
- on a condition that an indication for accessing a channel in a time interval for wireless stations having AIDs associated with a positive indication in the TIM element is received at the wireless station, determine a backoff number for the wireless station as a function of an index of the AID of the wireless station;
- on a condition that the indication is not received at the wireless station, determine the backoff number for the wireless station as a function of the AID of the wireless station;
- and
- determine a medium access backoff time for the wireless station by multiplying the backoff number by the time value.
4 more elements
Dependencies are inferred from the claim text.