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Quality of service management for a wireless local area networkQuality of service management for a wireless local area network description/claimsThe Patent Description & Claims data below is from USPTO Patent Application 20090161540, Quality of service management for a wireless local area network. Brief Patent Description - Full Patent Description - Patent Application Claims
This application is a continuation of U.S. patent application Ser. No. 10/981,002 filed on Nov. 4, 2004, which claims the benefit of U.S. Provisional Application No. 60/517,695, filed Nov. 5, 2003, which is incorporated by reference as if fully set forth herein. The present invention relates to wireless local area networks (WLANs), and more particularly, to a method and system for managing quality of service (QoS) specifications in WLANs. Wireless communication systems are well known in the art. Generally, such systems comprise communication stations, which transmit and receive wireless communication signals between each other. Depending upon the type of system, communication stations typically are one of two types: base stations or wireless transmit/receive units (WTRUs), which include mobile units. The term base station as used herein includes, but is not limited to, a base station, a Node B, a site controller, an access point (AP), or other interfacing device in a wireless environment that provides WTRUs with wireless access to a network with which the base station is associated. In a WLAN, an AP is the preferred device, and will be used herein to describe the present invention. The term WTRU as used herein includes, but is not limited to, a user equipment, a mobile station, a fixed or mobile subscriber unit, a pager, or any other type of device capable of operating in a wireless environment. WTRUs include personal communication devices, such as phones, video phones, and Internet ready phones that have network connections. In addition, WTRUs include portable personal computing devices, such as PDAs and notebook computers with wireless modems that have similar network capabilities. WTRUs that are portable or can otherwise change location are referred to as mobile units. In a WLAN, a station (STA) is the preferred device, and will be used herein to describe the present invention. A popular WLAN environment with one or more APs is built according to one of the IEEE 802.11 family of standards. The basic service set (BSS) is the basic building block of an 802.11 WLAN and consists of a plurality of STAs. A set of STAs which can talk to each other can form a BSS. Multiple BSSs are interconnected through an architectural component, called a distribution system (DS), to form an extended service set (ESS). An AP is a STA that provides access to the DS by providing DS services and generally allows concurrent access to the DS by multiple STAs. Systems compliant with the 802.11a/b/g WLAN standards are in widespread use. Quality of Service (QoS) capable WLANs are also emerging. The QoS solutions/specifications vary between proprietary solutions and standardized solutions where even the standard solutions have two types of QoS schemes, namely: 802.11e enhanced distribution coordination function (EDCA) and 802.11e hybrid coordination function (HCCA) schemes. The 802.11e QoS facility defines a new hybrid coordination function (HCF) used only in a QoS enhanced basic service set (QBSS). HCF has two modes of operation: HCF with contention operation (also known as EDCA) and HCF with polled access operation. A basic concept utilized by these channel access functions is the transmission opportunity (TXOP). A TXOP is a point in time when a STA can begin transmitting frames for a given duration. During a TXOP, a STA can transmit as many frames as possible in the TXOP, which is set according to the traffic class (TC) associated with the data. A key difference between EDCA and HCCA is in how admission control is handled. In EDCA, admission control is handled by a distributed admission control (DAC) function, which measures the utilization percentage of the medium for each TC. The unused percentage of the medium is known as the available transmission budget for the TC. As the transmission budget approaches zero, limitations are imposed on adding new traffic flows or modifying existing traffic flows. In HCCA, a STA requests particular reservation parameters for each traffic flow, based on the TC of the traffic flow. The HCF can then reject, accept, or offer an alternative set of parameters to the requesting STA. While this is more robust than DAC, the traffic flows need to be properly scheduled. A method for managing quality of service (QoS) in a wireless local area network begins by receiving a traffic flow. The traffic flow is mapped to a traffic class (TC), based on QoS requirements of the traffic flow. A transmission budget of an access class (AC) is calculated, each AC including at least one TC. A determination is made whether the traffic flow can be admitted, by calculating whether the transmission budget can support the traffic flow. If the traffic flow is admitted, the parameters of the TC are adjusted and collisions in the TC between existing traffic flows and the newly admitted traffic flow are managed. A method for managing quality of service in a wireless local area network begins by receiving a traffic stream request, including a traffic specification (TSPEC) containing parameters of the traffic stream. The parameters contained in the TSPEC are analyzed and a determination is made whether the traffic stream can be admitted. The traffic stream is admitted if it can be admitted without changing the parameters. The parameters are renegotiated if the traffic stream could be admitted by changing the parameters, and then the traffic stream is admitted with the renegotiated parameters. The traffic stream is rejected if it could not be admitted. Continue reading about Quality of service management for a wireless local area network... Full patent description for Quality of service management for a wireless local area network Brief Patent Description - Full Patent Description - Patent Application Claims Click on the above for other options relating to this Quality of service management for a wireless local area network patent application. Patent Applications in related categories: 20090290489 - Method of balancing wireless load and access controller - The present invention discloses a method of balancing wireless load and an Access Controller (AC). The method includes: receiving by an Access Controller (AC) an association request of joining an Access Port (AP) sent by a Station (STA); calculating wireless load of the AP that the STA requests to join; ... 20090290490 - Sharing a radio frequency interface resource - Applications may seek access to a radio frequency interface resource on a processor-based system that exceeds the available capacity of that resource. When more than one application needs access to an RF interface resource at the same time and the available capacity of the RF interface resource does not permit ... ###  How KEYWORD MONITOR works... a FREE service from FreshPatents1. Sign up (takes 30 seconds). 2. Fill in the keywords to be monitored. 3. Each week you receive an email with patent applications related to your keywords. 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