Abstract
The paper presents a dynamic subchannel assignment algorithm based on orthogonal frequency division multiple access technology operating in the time division duplexing and a new cross-layer design based on a proposed routing protocol jointed with the MAC protocol. The proposed dynamic sub-channel assignment algorithm provides a new interference avoidance mechanism which solves several drawbacks of existing radio resource allocation techniques in wireless networks using OFDMA/TDD, such as the hidden node and exposed node problems, mobility, and cochannels interference in frequency (CCI). Besides, in wireless networks, when a route is established, the radio resource allocation problems may decrease the end to end performance proportionally with the length of each route. The contention at MAC layer may cause the routing protocol at network layer to respond by finding new routes and routing table updates. The proposed routing protocol is jointed with the MAC protocol based on dynamic sub-channel assignment to ensure that the quality of service in multihop ad hoc networks is significantly improved.
Highlights
The cochannel interference (CCI) is one of the major challenges in wireless networks for multihop communications
Dynamic sub-channel assignment algorithm based on orthogonal frequency division multiple access (OFDMA) technology operating in time division duplexing has been studied in [4,5,6,7]
In our previous work [7], we proposed a dynamic sub-channel assignment (DSA) algorithm based on orthogonal frequency division multiple access (OFDMA) technology operating in time division duplexing (TDD)
Summary
The cochannel interference (CCI) is one of the major challenges in wireless networks for multihop communications. Dynamic sub-channel assignment algorithm based on orthogonal frequency division multiple access (OFDMA) technology operating in time division duplexing has been studied in [4,5,6,7]. In our previous work [7], we proposed a DSA algorithm based on orthogonal frequency division multiple access (OFDMA) technology operating in time division duplexing (TDD). This algorithm can maximize overall throughput of networks as well as solve some drawbacks existing in cellular networks such as hidden node and exposed node problems.
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