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IEEE 802.16 mesh mode is positioned to be used as a wireless backbone network. In coordinated distributed scheduling (C-DSCH), when nodes transmit control messages to compete for channel access, they need to wait for some period of time called hold-off time to compete again. Network performance is sharply affected by the hold-off mechanism in the bandwidth reservation procedure. In this paper, a new...
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...
In the paper we investigate the methods of constructing the routing tree in WiMAX networks with mesh topology. The concept of network efficiency optimization by building the routing tree characterized by selected topological properties that are independent on network load is presented. As an important partial result, correlations between topological parameters of the tree and network efficiency have...
In Distributed WiMAX Mesh Networks (DWMN), a joint solution with FEBA (Fair End-to-end Bandwidth Allocation) and DRR (Deficit Round Robin) can be used to achieve high end-to-end throughput fairness. Even then, the higher the number of hops a traffic flow traverses, the longer becomes the end-to-end delay of the traffic flow. This will result in serious unfairness of service quality among real-time...
In this paper, we compare the capacities of WiFi networks in their different possible implementations. These implementations include hierarchical WiFi/WiMAX networks where WiFi APs are connected to the Internet using WiMAX links, and WiFi mesh networks where WiFi APs may play the role of routers that send packets to other APs, acting as Internet gateways. At the packet level, we model both WiFi and...
The IEEE 802.16 mesh network is a promising next generation wireless backbone network. Under Coordinated Distributed Scheduling (CDS) mode, setting the holdoff time for nodes is essential to achieving good performances of medium access control layer scheduling in the networks. In this paper, we propose a dynamic scheme for setting holdoff time in IEEE 802.16 mesh mode with CDS. This scheme allows...
The IEEE 802.16/WiMAX mesh standard is a promising technology to support next generation wireless broadband metropolitan area networks. The medium access control (MAC) layer of IEEE 802.16 mesh supports both centralized and distributed scheduling mechanisms. The coordinated distributed scheduling mechanism uses a pseudo-random election algorithm to determine the transmission times of the nodes. The...
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...
In WiMAX Mesh Networks, the waste problem of allocated minislots in the three-way handshaking procedure of Coordinated Distributed Scheduling (CDS) will degrade the end-to-end performance of traffic flows. In this paper, an enhanced mechanism which combines adaptive holdoff algorithm with regrant solution is proposed to deal with the above-mentioned problem. Moreover, a new grant horizon based on...
The IEEE 802.16 standard, also known as WiMAX, provides a mechanism to create a multi-hop mesh network. In order to improve the performance, multi-channel transmission can be adopted, however, a heavy scheduling scheme will affect network performance. This paper proposes a novel algorithm, called Layered Critical Path (LCP), which is a channel assignment scheme in a multi-channel single-transceiver...
In order to improve network coverage and throughput at low cost, a mesh mode is defined in IEEE 802.16 standard recently. Although the standard defines the multiple access signaling mechanisms, it doesn't specify resource allocation issue. In this paper, we address the problem of resource allocation with the goal of achieving optimization network throughput in WiMax mesh networks. We first establish...
A huge effort has been applied on the study of wireless mesh networks (WMNs) over the last few years. As part of this effort the IEEE 802.16 standard for local and metropolitan area networks specifies a mesh mode of operation. Although several technical aspects of the physical and medium access layers of the standard have been studied, only few works investigate how the WiMAX mesh mode architecture...
The IEEE 802.16j WiMAX standard outlines the method for creating a multi-hop mesh network, which can be deployed as a high speed wide-area wireless network. To realize the full potential of such high-speed mesh networks, an efficient wireless radio resource allocation extension has been developed. Load balancing is a technique to spread work between two or more elements, in order to get optimal resource...
This paper aims to investigate the minislot scheduling problem in IEEE 802.16 mesh networks, where a minislot is the atomic unit for bandwidth allocation. Inappropriate minislot selection will cause minislot insufficient problems and the data collision problems. These problems will degrade the network throughput and the minislot utilization. Therefore, a Decentralized Minislot Scheduling Protocol...
We investigate WiMAX mesh networks in terms of delay and throughput trade-off. For a given topology, using our proposed analytical model we study how slot allocation policy and forwarding probability affects per-node and network performance.
In wireless mesh networks, the end-to-end throughput of traffic flows depends on the path length, i.e., the higher the number of hops, the lower becomes the throughput. In this paper, a fair end-to-end bandwidth allocation (FEBA) algorithm is introduced to solve this problem. FEBA is implemented at the medium access control (MAC) layer of single-radio, multiple channels IEEE 802.16 mesh nodes, operated...
Wireless self-organizing network including WiMAX (worldwide interoperability for microwave access) mesh networks can provide effective communication in pervasive computing environment. To resolve the problem that WiMAX Mesh network lacks QoS (Quality of Service) guarantee mechanism, a novel resource reservation mechanism used in WiMAX mesh network is proposed. This mechanism uses existing service...
Wireless mesh networks (WMNs) are one of the key features of beyond 3G system because of their flexible and low-cost deployment. IEEE 802.16 mesh mode has recently emerged as an alternative protocol for establishing WMN. Because the WMN is used as wireless backbone network, the design of WMN protocol should target a high network throughput. Then, in IEEE 802.16 mesh standard, the performance improvement...
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