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In this paper we have proposed an adaptive scheduling algorithm to suit group mobility scenarios in the mobile WiMAX. The QoS scheduling scheme aims to minimize the end-to-end delay for real-time traffic. IEEE 802.16e is a wireless broadband network standard aimed at providing robust, high data rate mobile communication. The issue of group mobility in mobile WiMAX networks has not been explored so...
Wireless LANs (WLANs) suffer degrading performance when operating within domestic areas due to multiple reasons such as: multi-path, fading, path loss and user mobility. To overcome this, transmission rate is usually adjusted to a more error-resistant rate. In this paper, we first present a novel rate adaptation algorithm for IEEE 802.11 that can efficiently identify the threshold frame error rate...
IEEE 802.11 wireless mesh networks emerge as an alternative to provide an infrastructure for last mile access networks in remote areas. The meshed topology provides good reliability, low cost, market coverage and scalability. However due to the shared nature of wireless medium, which limits the available network bandwidth, it is necessary to implement an effective load control scheme that enable the...
Nowadays IEEE 802.11 family is the most popular technology amongst wireless protocols including Bluetooth, UWB and WiMAX for wireless services, among which media streaming such as voice over Internet Protocol (VoIP) and IPTV are most demanded with high challenge. To accommodate the QoS issues, EDCA and HCCA functions are defined in IEEE 802.11e. However, EDCA provides QoS based on probability, so...
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...
IEEE802.16, as a wireless MAN broadband access standard, defines a flexible QoS mechanism in MAC layer for wild variety classes of services. However, it dose not define specific admission control strategy and scheduling algorithm, which are becoming the research hotspot in recent years. In this paper, we focus on the features of services defined in IEEE802.16, including UGS, ertPS, rtPS, nrtPS and...
Seamless handoffs with quality of service (QoS) guarantee play a decisive role in the provision of realtime applications such as Voice over Internet Protocol (VoIP) over IEEE 802.11 networks. During a handoff process, a channel scan needs to be first performed in order to discover new access points (APs), and it can be done by either passively listening to beacon signals or actively exchanging probe...
Handoff procedure in IEEE 802.11 wireless networks must be accomplished with as little interruption as possible to maintain the required quality of service (QoS). We have developed a fast handoff scheme, called AuthScan, to provide a novel usage of the open system authentication phase to reduce channel scanning latency. AuthScan comprises two steps: firstly, a client caches its handoff history with...
Ethernet-based network technologies are under investigation as a result of an increase of digital media devices. Standardizing the transmission technologies of time-sensitive traffic over the Ethernet has progressed in the IEEE 802.1 AVB TG. In this paper, we implemented IEEE 802.1 AVB Local Area Network system for time-sensitive traffic. In addition, we have proposed frame forwarding rules and a...
For the battery-powered wireless stations, power saving is one of the significant issues in IEEE 802.11 wireless local area network (WLAN). Recently, Lei and Nilsson investigated power save mode in IEEE 802.11 infrastructure network by an M/G/1 with bulk service where they obtained mean packet delay and bound of the average Percentage of time a station stays in the doze state (PTD). In this paper,...
Nowadays, wireless network users demand support for different types of traffic combined with longer battery lifetime for their mobile devices. This work proposes a new medium control for wireless LANs as an alternative to the HCF (hybrid coordination function) scheme defined by the IEEE 802.11e workgroup. LEPOHA (low energy priority oriented hybrid access) is a complete medium access mechanism, it...
In this paper the use of IEEE 802.16 based networks for voice communications is considered. Specifically the system voice traffic performance is investigated in conjunction with the carrier grade QoS restrictions. The burstiness of voice traffic with VAD is taken into account. Analytical methods for carrier grade voice traffic over IEEE 802.16 system evaluation under different scheduling algorithms...
IEEE 802.11e provides basic mechanisms for traffic differentiation in WLANs previously unavailable with the IEEE 802.11 standard. The enhanced distributed channel access (EDCA) is probably the most promising subset of such mechanisms, and it is already implemented in a huge number of Network Cards. In this paper we present an algorithm for the provisioning of QoS in EDCA WLANs. The algorithm is based...
The paper presents analysis of implementation of different MAC protocols in broadband powerline (BPL) networks. Analysis is focussed on impact of choice of MAC protocols on QoS parameters, specifically delay, packet loss rate and throughput. Subject of the paper is analysed on a test model of access (low-voltage) PLC cell, with BPL network customers generating different types of services (triple play...
Access to networked data and information services has taken on an ever increasing importance to users for business, entertainment, and social networking applications. Users want high-speed, high-reliability, and high-quality access to these information services to be ubiquitous and available when they are fully mobile. Having these services available in a mobile environment also provides additional...
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