US Patent No. 10,433,313

DOWNLINK OFDMA FOR SERVICE SETS WITH MIXED CLIENT TYPES


Patent No. 10,433,313
Issue Date October 01, 2019
Title Downlink Ofdma For Service Sets With Mixed Client Types
Inventorship Brian D. Hart, Sunnyvale, CA (US)
Assignee Cisco Technology, Inc., San Jose, CA (US)

Claim of US Patent No. 10,433,313

1. A method comprising:at a wireless access point that serves at least first and second devices configured to communicate wirelessly with the access point, having lower and higher bandwidth capabilities, and configured to operate at lower and higher data rates, respectively:
contending for bandwidth to determine bandwidth available for downlink transmissions;
generating control parameters including information that:
assigns, from the bandwidth available, first and second non-overlapping channel bandwidths for first and second downlink transmissions to the first and second devices, respectively;
indicates timing for an acknowledgement to be sent from the first device and after which an acknowledgement from the second device is to be sent; and
schedules the first and second downlink transmissions under a constraint that the first downlink transmission is to be longer than the second downlink transmission, such that the first and second downlink transmissions end before receiving the acknowledgements;
transmitting, on the first and second non-overlapping channel bandwidths in advance of a downlink transmission interval, a control frame containing the control parameters;
transmitting during the downlink transmission interval a first downlink transmission of data to the first device over the first channel bandwidth at the lower data rate during a first time interval; and
transmitting during the downlink transmission interval a second downlink transmission of data to the second device over the second channel bandwidth at the higher data rate during a second time interval that partially overlaps with and ends at or before the first time interval.