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This paper investigates cell zooming and relaying in conjunction with the use of opportunistic sleep modes to save energy at times of low load in WiMAX network deployments. It performs extensive propagation measurements in a hilly area of Covilhã, Portugal, in order to present a realistic and topographically challenging scenario in which to perform dynamic optimizations. It describes these measurements...
Layered and cooperative elements such as femto-cells and relays can improve performance or energy efficiency in mobile networks; however, they consume energy per se and their durations in operational state must therefore be minimised. This paper investigates the use of relays in WiMAX network deployments and concentrates on the cost/revenue performance and energy efficiency trade-off in such cases...
To take full advantage of wireless mesh networks and cooperative transmission simultaneously, a WiMAX-based cooperative PMP/Mesh hybrid topology, CoWiMAX is presented in this paper. Firstly, a hierarchy mesh topology and a PMP/Mesh hybrid frame structure are introduced for CoWiMAX. Secondly, a cooperative PMP and relay transmission scheme is presented to support cooperative PMP and relay links. Simulation...
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...
Tactical communication architectures are evolving to support mobile broadband multimedia in NLOS environments. Multihop wireless systems have the potential to improve coverage and capacity over single-hop radio access systems. The IEEE 802.16 standard, also known as WiMAX, is a recent long-range broadband technology with mobility support, and the IEEE 802.16j substandard extends the range of mobile...
In order to improve the scheduling efficiency of IEEE 802.16 mesh mode, exactly theoretical analysis is necessary. In the IEEE 802.16 mesh mode with distributed coordinated scheduling, all nodes are peers and multi-hop communication is allowed. Every node has to compete for transmission opportunities based on scheduling information in the two-hop neighborhood. In this paper, we use probability-based...
System capacity is an important factor that affects the performance of WiMAX system where the amount of data that can be delivered to the end user is determined based on the system capacity and users QoS requirements. This scenario is even more complex when multi-hop relays are introduced into the network whereas the user access capacity decreases with the increase of hop number. In order to maintain...
IEEE 802.16j Multihop Relay (MR) is an optional deployment introduced to enhance the coverage and performance of WiMAX network without the need for deploying costly Base Stations (BSs). Multihop Relay network comprises of Multihop Relay BS (MRBS) and Relay Stations (RSs). This paper proposes mesh topology for IEEE 802.16j using adaptive RS group scheduling. The proposed scheduling algorithm introduces...
IEEE 802.16j mobile multi-hop relay network is proposed to enhance the system coverage, user throughput and the capacity of fixed/mobile broadband wireless access system in IEEE 802.16d/802.16e. Relay station (RS) enables data transmission between base station and end user when the channel is not good for transmission. Besides, one relay station also communicates with a pair of other relay stations...
In this paper the effectiveness of the networking existing data links to provide a robust and resilient network for the first responder's application is analysed. Methodology and an algorithm that can assist the internetworking different standards are presented. A cross standard scenario is simulated and results are explained.
This paper presents the analysis of MAC Layer (L2) in wireless broadband system based on WiMAX IEEE802.16. The analysis is focused on overhead and efficiency of MAC Management Message and derived for mesh topology. The Mesh topology is evaluated concerning both existing types of scheduling-centralized and distributed-and their performance is compared. Some parameters, which deduced to have considerable...
The IEEE 802.16d mesh mode allows control of the holdoff time for individual nodes, and thus it is possible to adapt the control channel of the local network to different network scenarios and through appropriate configuration of the holdoff time to improve the network throughput. This paper presents an algorithm for distributed scheduling mode that dynamically adjusts appropriated parameters, with...
Frequency reuse during access zone is widely adopted for throughput enhancement in IEEE 802.16j relay networks. Since areas covered by relay stations (RS) or base station (BS) may overlap, some mobile station (MS)s on the border between two neighboring transmitting stations (RS or BS) using an identical frequency band may suffer severe interference or outage. This co-channel interference within the...
In this paper, and for the purpose of optimizing the performance of WiMAX mesh networks using multiple channels, we search the minimum number of channels that maximizes the throughput capacity. WiMAX operates in the licensed bands, so it is important to use only the sufficent number of the scarce wireless channels. Moreover, it helps to decide whether or not to use frequency spatial reuse (FSR) that...
With the increase of network service types and userspsila broadband demand, broadband wireless access (BWA) has become the focus of peoplepsilas attention. The workgroup of IEEE 802 proposes the IEEE 802.16 standard to provide BWA. In IEEE802.16 mesh mode, all nodes are organized in an ad hoc fashion. Nodes use a pseudo-random function to compete for their transmission opportunities based on the scheduling...
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