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The integration of Ethernet Passive Optical Networks (EPONs) and IEEE 802.16 (WiMAX) has been lately presented as a promising fiber-wireless (FiWi) broadband access network. Conversely, lightweight layer-2 virtual private networks (VPNs) over FiWi, which can provide bandwidth guarantee to the respective users, were only recently addressed by Dhaini et. al. In this paper, WiMAX-VPON, the framework...
Having Internet and wireless networks continue their dramatic advances requires a lot to be provided such as seamless and soft handover procedure. However, seamless and fast handover mechanism is still one of the main research issues. When a mobile node performs macro movements, the changes in some access nodes, base stations and access routers are unavoidable. Upon such changes, MNs must re-register...
Next generation wireless networks will be heterogeneous, where several primary users (PU e.g. licensed users) and secondary users (SU e.g. unlicensed users) can operate in the same dynamic and reconfigurable networks at a given time. The major challenge in this heterogeneous radio environment is to enable the coexistence between PU and SU which will further improve the efficient use of radio spectrum...
Multimedia service is a fundamental requirement in the Wireless Broadband Access (WBA) network. It is a challenge for service operators to provide the low-latency applications, such as voice service, due to the limited wireless bandwidth resource. Although it has been carried out in wireless mobile 3G/3.5G networks, the user experience of Internet surfing is not satisfied. The mobile WiMAX 4G technology,...
IEEE 802.16j is an extension of IEEE 802.16 to support relay mode operation. This paper applies IEEE 802.16j to vehicular networks to provide Internet access for high-way vehicles. It designs a utility function, which considers different types of services and effect of velocity on vehicular networks. It proposes a dynamic bandwidth allocation (DBA) algorithm specifically for base stations (BSs) in...
With the development of novel access technologies e.g. LTE, WiMAX etc., the mobile devices are able to establish services over multiple wireless connections with different momentary capabilities. Being imported from the fixed line communication, the current services deployed are lacking an efficient mechanism of adaptation to the momentary connectivity conditions, which deters the efficiency of the...
In this work we deal with Congestion Control (CC) strategies to protect the Quality of Service (QoS) of Real Time (RT) services in Orthogonal Frequency Division Multiple Access (OFDMA)-based and packet-switched networks such as Long Term Evolution (LTE) and Worldwide Interoperability for Microwave Access (WiMAX). Specifically, the first contribution of this paper is the adaptation of a CC strategy...
Integration between Ethernet Passive Optical Network (EPON) and Worldwide Interoperability for Microwave Access (WiMAX) is a promising solution for next generation access networks. In this paper, we devise a new architecture framework for EPON-WiMAX hybrid networks that is more reliable and extend the service coverage range. In addition, we propose a new bandwidth allocation algorithm for the proposed...
In this paper we present a new algorithm for detecting mobile Worldwide Interoperability for Microwave Access (WiMAX) signals in cognitive radio systems, which is based on preamble-induced second-order cyclostationarity. We derive closed form expressions for the cyclic autocorrelation function (CAF) and cyclic frequencies (CFs) due to the preamble, and use these results in the proposed algorithm for...
As Scheduling for real time polling services (rtPS) is not defined in IEEE 802.16 standard, there are various approaches described to address this issue. IEEE 802.16 has detailed documents about the QoS parameter. However, they do not mention the scheduling algorithm to be used. The essential goals of this packet scheduling scheme are to guarantee the QoS parameter as well as provide fairness among...
QoS provisioning is an important issue in the deployment of broadband wireless access networks. The scheduling scheme is essential to guarantee the QoS requirements of different service classes. WiMAX Orthogonal Frequency Division Multiple Access (OFDMA) system specifies the Orthogonal Frequency Division Multiplexing (OFDM) symbol mapping in a rectangular shape manner. In this paper, we propose a...
IEEE 802.16 supports both single-hop and multi-hop mesh modes. It defines several traffic and service categories and offers differentiated quality of service (QoS) through scheduling algorithms. In IEEE 802.16, a three-way handshaking mechanism is given to reserve the slots hop-by-hop for mesh networks, which is called Hop-by-hop Bandwidth Reservation Protocol (HBRP). However, HBRP can not assure...
IEEE 802.16d standard defines WiMAX Mesh mode, which uses Centralized Scheduling (CS), Distributed Scheduling (DS), and co-existence of CS/DS data subframes to allocate resources for data transmissions. The CS and CS/DS schemes are suitable for Internet traffic, but the lack of spatial reuse in over-pessimistic use of CS causes scalability problems and bandwidth limitations. In this paper a Hybrid...
This paper focuses on improving the scheduling capabilities of the IEEE 802.16-2005 broadband wireless networks, through utilizing multi-queuing algorithms and switching between those queuing algorithms over time to maximize the performance of the WiMAX system. The proposed algorithm aims to improve throughput of high priority traffic in congested networks, without violating the right of lower-priority-traffic...
With the provisioning of interworked heterogeneous wireless networks and the growing popularity of smart mobile devices, ubiquitous service and data access is showing a demanding growth. As a result, scenarios of group mobility evolved with the increasing trend where a number of commuters on a transportation carriage would access such services. Making this scenario further complex, there was also...
One of the most challenged area in fourth generation wireless network is service continuity, i.e., when a mobile node is moving in an overlapping area continuous service must need so there a technique is used called “HANDOVER”. This technique is used to achieve the service continuity, for this we must rely on seamless vertical handover techniques with minimum processing delay. Thus it is necessary...
This paper gives an analysis about OFDM based WiMAX 802.16e with optimum training symbols. In further, performance is evaluated by considering the variable Delay Spread, Frequency Diversity, and with different Adaptive Modulation and Coding. The evaluation of system is performed over simulations showing, Packet error ratio [PER] versus mean Eb/No with Rayleigh fading. The system is considered with...
In this work, we propose a novel combined packet scheduling and call admission control to provide a stable video streaming service to large numbers of subscribers over WiMAX network. First, the proposed call admission control algorithm estimates the expected network throughput in the near future by using a measurement-based local linear model and the control parameter of the proposed scheduling algorithm,...
This paper considers the transmission performance of multimedia streams, especially Scalable Video Coding (SVC), over mobile WiMAX networks. SVC supports temporal, spatial, and quality scalabilities at bit-stream level, which enables the easy adaptation of video by selecting the sub-sets of bit-stream. Thus, SVC streams are more suitable than non-scalable bit-streams in the mobile environment where...
A wireless backhaul network is used to interconnect intermediate nodes to gateway nodes. As it is designed to serve a large population of broadband users, failure sustainability becomes an essential requirement to ensure uninterrupted telecommunication services even in the presence of occasional node or link failures. In this paper, the performance of a failure sustainable wireless backhaul, based...
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