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Cognitive Radio Network Dynamic Spectrum Allocation and Routing Protocols

Author: ChenChao
Tutor: LiuGan
School: Huazhong University of Science and Technology
Course: Communication and Information System
Keywords: Cognitive radio Multi-hop cognitive radio networks Dynamic spectrum allocation Priority access Multi-path routing
CLC: TN925
Type: Master's thesis
Year: 2011
Downloads: 27
Quote: 0
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Abstract

The rapid development of wireless communication technology makes it possible to obtain increased bandwidth, but also makes the current wireless communication presents isomerization, broadband, high-speed data rates, the communication business diversification trends. However, the radio spectrum is a non-renewable natural resources, and its efficient use is extremely important. Current spectrum allocation and licensing management modes fixity inefficient use of spectrum, the wireless communication is facing severe challenges; same time, heterogeneous network environment also contributed to the dynamic changes in demand for wireless communication services (such as mobile communications, television broadcasting, public safety, etc.) and the contradiction between the scarcity of spectrum resources, which severely limits the current and future wireless communications network deployment and operation, to the development of wireless communication networks has brought unprecedented challenges. To solve these problems, there is a new wireless communication research hotspots that are cognitive radio technology. Since the concept of cognitive radio has been proposed, it has attracted wide attention and a lot of research. Current domestic and international research institutions, universities and academics on the cognitive radio technology research focused on spectrum sensing and dynamic spectrum allocation. This paper briefly introduces the first two chapters of the background of cognitive radio, the current development status of cognitive radio networks and research hotspots, including key technologies of cognitive radio, cognitive radio network architecture, relevant research institutions, standardization organizations ; and then gives the network environment of this study, the study's purpose and meaning; concluded that the scope of this paper to study (dynamic spectrum allocation and routing algorithm), the problem to be solved and is expected to reach the goal. In this article, the third and fourth parts to multi-hop cognitive radio networks as the background, were investigated two user MAC layer dynamic spectrum allocation algorithm and network layer routing algorithms. This article aims to dynamic spectrum allocation algorithm based on priority access to the main user authorization for improving channel utilization: First, according to the two characteristics of user services, business cooperation arrival rate and perceived benefits, etc. for two users themselves modeling, the secondary user area is divided into different priority levels; Second, the authorization cooperate sensing channel, the channel utilization for the authorization, the data rate for priority modeling; Then, based on these two models proposed and designed Priority-based cognitive multichannel (PCM-MAC) access policy that has a certain fairness, to ensure that different types of businesses or business volume of two different user access authorization fair portion of the channel is idle, thus effectively improve the spectrum utilization. This network layer routing algorithm to existing mobile ad hoc network routing protocol OLSR based on proposed and designed one for multi-hop wireless network, two cognitive multi-user network routing protocol (LCM-OLSR), the load balance to different paths, and the link layer with the MAC protocol for cross-layer optimization, namely taking into account the routing and availability of spectrum to reduce the end to end delay, increase the delivery rate of the packet, and so reduce the routing overhead.

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