A Routing Approach for Multi-channel Wireless Ad-Hoc Network with Single Transceiver
Date Issued
2005
Date
2005
Author(s)
Chou, Tsung-Yi
DOI
en-US
Abstract
Wireless ad-hoc networks allow mobile users or devices to seamlessly interwork in areas without any pre-existing communication infrastructure. However, the networks may suffer from rapid performance degradation as the number of users increases. One reason for the performance degradation is the fact that all nodes in the network share the common channel. If one node is within the interference range of others, it must to content the channel according to IEEE 802.11 DCF protocol, and this degrades the network performance.
Hence, The IEEE standard allows the use of multiple channels available at the physical layer, but the upper layer protocol is only designed for single-channel environment. The single-channel protocol is not suitable in multi-channel environment due to the multi-channel hidden terminal problem. Furthermore, it also cannot take advantage of the benefit of multi-channel environment, e.g. multi-channel communication can simultaneously take place in the same region without interfering each other.
In this thesis, we study a routing protocol for wireless ad hoc networks that utilizes multiple channels dynamically to improve performance. Our protocol only requires a single transceiver with functionality of dynamically switching per host without using any additional hardware or modifying the MAC protocol. We also evaluate the performance of our protocol by simulations. The results show that our proposed protocol can significantly improve the performance in multi-channel environments. In addition, we also discuss the considerations, impact factors, and other research issues for designing multi-channel protocols.
Subjects
無線網路
多頻道
路由協定
WLAN
ad-hoc network
routing protocol
multi-channel
Type
thesis
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