US Patent No. 9,320,048

WIRELESS COMMUNICATIONS WITH PRIMARY AND SECONDARY ACCESS CATEGORIES


Patent No. 9,320,048
Issue Date April 19, 2016
Title Wireless Communications With Primary And Secondary Access Categories
Inventorship Yong Liu, Campbell, CA (US)
Raja Banerjea, Sunnyvale, CA (US)
Harish Ramamurthy, Sunnyvale, CA (US)
Assignee Marvell World Trade Ltd., St. Michael (BB)

Claim of US Patent No. 9,320,048

1. A method, comprising:
determining a primary access category for a transmission opportunity (TXOP) to transmit data to a primary wireless communication
device, the primary access category being an access category included in a group of access categories that are associated
with different transmission priorities, respectively, wherein determining the primary access category comprises determining
the TXOP based on a first back-off timer associated with the primary access category;

retrieving one or more primary data units belonging to the primary access category to transmit to the primary wireless communication
device during the TXOP;

determining a secondary access category for the TXOP, the secondary access category being an access category included in the
group of access categories, the secondary access category having a transmission priority different from the primary access
category, wherein determining the secondary access category comprises (i) determining whether there is an access category
having a higher transmission priority than the primary access category and having data ready to send, and (ii) selecting as
the secondary access category, the access category with the higher transmission priority;

retrieving one or more secondary data units belonging to the secondary access category to transmit to a secondary wireless
communication device during the TXOP;

transmitting, via two or more antennas, spatially steered streams during the TXOP, the steered streams embodying (i) the one
or more primary data units and (ii) the one or more secondary data units, wherein the steered streams concurrently provide
separate data to respective devices comprising the primary wireless communication device and the secondary wireless communication
device;

controlling a second back-off timer associated with the secondary access category, wherein the second back-off timer is not
penalized for a communication failure associated with the primary access category during the TXOP; and

controlling a contention window associated with the secondary access category, wherein the contention window is not penalized
in response to a communication failure associated with the secondary access category during the TXOP, wherein the second back-off
timer is not penalized for the communication failure associated with the secondary access category during the TXOP.