Control Of Quality Of Service In Overlapping Basic Service Sets In Wireless Local Area Networks

摘要

Access priority for wireless devices located in an area in which radiofrequency (RF) coverage areas of a first wireless access point and a second wireless access point overlap is controlled by coordinating operation of the first wireless access point and the second wireless access point. The wireless devices access a common RF channel via a collision sense multiple access/collision avoidance mechanism. The probability of accessing the RF channel may be varied by adjusting the length of interframe spacings and the length of contention windows. The length of the interframe spacings and the length of the contention windows associated with the first access point and associated with the second access point are configured such that the probability of wireless devices associated with the first wireless access point accessing the RF channel is greater than the probability of wireless devices associated with the second wireless access point accessing the RF channel.

主权项

1. A method for controlling access priority to a radiofrequency (RF) channel between a first wireless device associated with a first wireless access point having a first RF coverage area and a second wireless device associated with a second wireless access point having a second RF coverage area, wherein the first RF coverage area and the second RF coverage area converge in an overlap RF coverage area, wherein the first wireless device and the second wireless device are located within the overlap RF coverage area, and wherein the first wireless device and the second wireless device each access the RF channel via a collision sense multiple access/collision avoidance (CSMA/CA) mechanism, the method comprising the steps of:
transmitting, by a system comprising a processor, to the first wireless device a first message comprising a first set of lengths of first interframe spacings and a first set of maximum lengths of first contention windows; transmitting, by the system, to the second wireless device a fourth message comprising a fourth set of lengths of fourth interframe spacings and a fourth set of maximum lengths of fourth contention windows; transmitting, by the system, to the second wireless device a second message comprising a second set of lengths of second interframe spacings and a second set of maximum lengths of second contention windows; and transmitting, by the system, to the first wireless device a third message comprising a third set of lengths of third interframe spacings and a third set of maximum lengths of third contention windows; wherein the first message is addressed to a specific station associated with the first wireless access point, wherein the first set of lengths of first interframe spacings, the first set of maximum lengths of first contention windows, the second set of lengths of second interframe spacings, and the second set of maximum lengths of second contention windows are configured such that a probability of the first wireless device accessing the RF channel is greater than a probability of the second wireless device accessing the RF channel, wherein the step of transmitting to the first wireless device a first message comprises a step of transmitting, by the system, a first channel access throttling frame comprising a first enhanced distributed channel access parameter set to the first wireless device; and wherein the step of transmitting to the second wireless device a second message comprises the step of transmitting, by the system, a second channel access throttling frame comprising a second enhanced distributed channel access parameter set to the second wireless device.