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We propose the Most-Emergent-First (MEF) scheduler which regard the emergency score obtained from the delay status and traffic specification (TSPEC) to determine transmit sequence of flows. Via cross-layer signaling, transmission opportunities (TXOPs) of flows are dynamically adjusted to meet the TSPEC while the bandwidth utilization in a IEEE 802.11e environment is maintained. The proposed prioritized...
In recent years, IEEE 802.11 Wireless Local Area Networks (WLANs) have emerged as one of the prevailing technologies for the broadband wireless access. Although IEEE802.16 wireless network has become a newer generation of wireless network, it will be used as wireless metropolitan area network in the beginning because of its price. IEEE 802.11 network will continue to be the most important wireless...
IEEE 802.11e constitutes the “state of the art” standard for providing QoS to multimedia traffic in Wireless Local Area Networks (WLANs). However, it has been proven inadequate in certain network conditions (high load). Several mechanisms improving its performance have been proposed in the past years. Most of them focused on altering the static nature of resource allocation specified in IEEE 802.11e...
A new subfunction for the IEEE 802.11e EDCF allowing efficient transport of real-time traffic is proposed. The delay induced by the freezout of the backoff counter is to be considered. Intentional dropping is used if a certain threshold delay is exceeded. A system enabled with this suggested feature is analyzed and the impact of backoff parameters on the transmission probability, the dropping probability,...
The advancement of 3D video technologies enables us to experience 3D video at home, office and public places. In this paper, a prioritization scheme for backward compatible 3D video distribution over Wireless Local Area Networks (WLANs) is proposed for home/office environments. The scheme is designed to work with the colour plus depth representation format. Colour and depth map sequences have different...
IEEE 802.11 Wireless Local Area Network (WLAN) is one of the most widely deployed wireless network technologies in the world today. However, 802.11 MAC algorithm is unable to support modern multimedia applications which require certain level of quality of service (QoS) guarantees in terms of consistent, timely and reliable data transfer. The 802.11e MAC protocol provides extension for adjustment of...
The IEEE 802.11 protocol has achieved worldwide acceptance with WLANs with minimum management and maintenance costs. However, IEEE 802.11 can only provide a best effort service and does not support the quality of services (QoS). Furthermore, the performance of the distributed coordination function (DCF) degrades significantly under heavy load due to the increasing time wasted during collision. In...
This paper studies performance optimisation in WLANs, by means of Quality of Service (QoS) algorithms. The 802.11e standard for QoS is analysed, compared to legacy ones, new algorithms being developed in order to improve it. All this was done in multi-service, multi-profile scenarios, with a varying number of users, in order to emulate the behaviour of real networks. QoS mechanisms manage to increase...
Wireless networks and multimedia applications are two rapidly emerging technological trends. The IEEE 802.11e protocol has been developed to support QoS for such delay-sensitive applications in wireless networks. This protocol has also been extensively studied in the literature over the past few years, and several mechanisms to improve its performance have been proposed concentrating on ways to reinforce...
With the emerging IEEE 802.11n standard, the WLAN is poised as a promising ubiquitous networking technology to support multimedia applications where providing QoS becomes imperative. However, the 802.11 WLAN is not designed to support delay sensitive traffic. This problem is magnified during a handover and typically results in excessive handover latency and packet loss. In addition, a 802.11 WLAN...
The IEEE 802.11 e defines the hybrid coordination function (HCF) which specifies the QoS algorithms in the MAC layer of the WLAN. HCF controlled channel access (HCCA) is based on centralized polling mechanism and provides parameterized QoS. This paper proposes an optimized traffic scheduling algorithm for variable bit rate (VBR) over HCCA, which can allocate network resource based on actual flows...
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