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Call admission control (CAC) is one of the most important parts in radio resource management of CDMA networks, and it has an important effect on the quality of service (QoS). The most concern of traditional CAC strategies is to harmonize the blocking probability and dropping probability, so as to maximize the resource utility. With the development of radio network, not only resource utility is the...
Wireless ad hoc network is one of the hottest research fields in the past few years. Since the routing protocol and multichannel usage are very important to the performance of wireless ad hoc network, there's a need to co-design the two issues. This paper firstly gives an overview of single-channel OLSR protocol, and then a multi-MAC based multi-channel OLSR protocol is proposed. Through simulation...
Call admission control (CAC) is one of the most important parts in radio resource management of CDMA networks, and it has an important effect on the quality of service (QoS). The most concern of traditional CAC strategies is to harmonize the blocking probability and dropping probability, so as to maximize the resource utility. With the development of radio network, not only resource utility is the...
ITS hybrid Wireless Mesh Network (WMN) is special case of WMN containing relatively static mesh points and mobile mesh clients, which may suffer from random variations in channel and network condition and handoff problems due to mobility of mesh clients. This leads to poor performance in multi-hop WMN, especially with conventional non-flexible routing algorithms. To cope with instability of wireless...
This paper introduces a practical scheme in order to improve multi-hop throughput as well as to minimize packet's average end to end delay by incorporating network coding, which is at present a widely discussed technique in multicast, with AODV in wireless Ad Hoc networks. This scheme is simple and easily implemented with modest overhead, and the simulation results show that this scheme can achieve...
The main purpose of handoff protocol is to provide high data rate and seamless supporting real-time services in the vehicle communication system. Potentially, Wireless Mesh Network (WMN) is one of the best answers to the vehicle communication system. How to provide efficient handoff protocol in the vehicle communication system is the major issue of our design. We analyzed the mathematical module of...
As the radio spectrum is a very scarce resource, the Call Admission Control (CAC) is one of the most important parts in radio resource management. The Code Division Multiple Access (CDMA) based next generation wireless communications systems will support the transmission of multimedia traffic, such as voice, video and data, thus the CAC, which can support the multimedia traffic and guarantee the Quality...
The upcoming IEEE Standard 802.11s will support wireless mesh framework. The draft of 802.11s introduces a new metric called airtime link metric. This paper analyses the performance of this metric and proposes a new Multi-metric (MM) consisting of the interference and mesh point's transmitting capability in wireless environment based on residual bandwidth, Frame Delivery Ratio (FDR), and mesh point's...
Wireless mesh networks (WMN) is a new distributed broadband access network. Compared with the typical mobile ad hoc network, it is with less mobility and usually not powered by the battery. Therefore, the traditional mobile ad hoc routing protocols are no longer suitable for WMN. In order to meet the performance requirements of multimedia traffic transmission, the routing protocol designed for WMN...
In some exiting call admission control (CAC) schemes, perfect power control is implicitly assumed. But it is well known that in practical CDMA networks, the received power at base station (BS) is usually hard to be maintained at a fixed threshold because of fading and path loss. Therefore putting forward the CAC schemes with imperfect power control for multimedia traffic will be great significant...
Wireless mesh network (WMN) is a special case of mobile ad hoc network where the nodes have relative fixed positions and communicate to the Internet through one or more gateways. Though traditional ad hoc routing algorithms, such as DSR etc., can be used in WMN, their performance is typically less than the ideal. The problem is that the assumptions provided in those algorithms that consider traffic...
A novel traffic engineering routing algorithm called Multi-metric QoS-aware Routing based on Fuzzy Theory (MQRFT) is proposed to solve traffic management problem and achieve a good trade-off between QoS provision and network performance based on DSR. The simulation results show that the protocol can improve the performance of managing network congestion effectively in terms of delay, overhead and...
Wireless mesh network (WMN) is an innovative approach in packet radio networks. Routing is one of key challenging issues since the unpredictable behaviours of the medium and the network topology. In this paper two statistical MAC layer parameters are explored: available residual bandwidth and Frame Transmission Efficiency (FTE). A metric called Degree of Congestion Control is defined so that the routing...
Connectivity is one of the important fundamental issues when designing mobile ad hoc networks. Normally, the physical connectivity of networks is broadly investigated, but the communication connectivity of networks has not been paid much attention. In this paper, connectivity enhancement mechanism based adaptive modulation for mobile ad hoc networks is deeply investigated on the basis of three typical...
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