Patent ID: 7221681
Filing Date: 2007-05-22
Classification: H04W

Abstract:
1. A method for providing recovery and backoff for an IEEE 802.11e Medium Access Control (MAC) layer of a Quality of Service (QoS) hybrid coordinator in a Quality of Service (QoS) wireless local area network comprising the steps of: transmitting from a hybrid coordinator a first frame that comprises one of: a request to send (RTS) frame and a non-CF-Poll Qos Data+ frame; determining whether said hybrid coordinator received a PHY-CCA busy indication during a point coordination function interframe space (PIFS) from an end of said transmitted first frame; and in response to determining that said PHY-CCA busy indication was received during said point coordination function interframe space (PIFS) from said end of said transmitted first frame, determining whether said hybrid coordinator received a response frame, wherein said method further comprising the steps of: in response to determining that said hybrid coordinator did not receive said response frame, performing in said hybrid coordinator one of: a recovery and a backoff; performing said backoff in said hybrid coordinator following a period of time equal to a point coordination function interframe space (PIFS) after an end of said PHY-CCA busy indication; and setting a value of an arbitration interframe space (AIFS) for wireless stations to a value that equals the sum of the value of a point coordination function interframe space (PIFS) and a maximum value of a contention window (CWmax) of a hybrid coordinator.