Network planning and performance optimization for wireless relay networks
Date Issued
2012
Date
2012
Author(s)
Lu, Hsiao-Chen
Abstract
Integrating relay stations (RSs) into the architecture of centralized wireless access networks to support multi-hop relaying has become a major trend for 4G wireless communication systems. Though commonly believed that RSs can effectively extend the coverage and enhance throughput of a network, integrating RSs into the system can bring as many challenges as benefits. Much more sophisticated network planning is required to make full use of RS’s functionality and to optimize the performance of a relay-assisted wireless access network.
In this dissertation, we study several critical issues for wireless relay networks. The first is the network deployment problem. We analyze the impacts of deployment locations on system performances for different types of network nodes. Considering different deployment scenarios and user distributions, we propose deployment strategies determining which types of stations should be deployed and their deployed locations, under a budget constraint. Due to the capacity limitation at each relay station, simply having each relay station independently relay traffics for their serving base station can only achieve limited performance gain, which motivates us to propose the concept of relay station cooperation. The second problem we studied is therefore how to coordinate relay stations to cooperatively serve the downstream users such that system capacity can be maximized without sacrificing fairness. Through analyzing the impacts of relay cooperation on its coverage and downstream rate, we have mathematically formulated this problem, and propose joint relay cooperation and resource assignment solution. The effect of relay station placement on the performance of relay station cooperation is also studied. The last problem tackled is how to select data forwarding strategies for relay stations when network coding is enabled for multi-cast data repair. We propose a Markov decision process to characterize the data forwarding process, by which a delay-optimal dynamic programming algorithm as well as two light-weight on-line heuristics are derived. To summarize, several critical issues induced when integrating relays into a wireless access network are studied in this dissertation. We believe that our analysis and observations are indispensible for the planning and performance optimization of next generation wireless relay network.
Integrating relay stations (RSs) into the architecture of centralized wireless access networks to support multi-hop relaying has become a major trend for 4G wireless communication systems. Though commonly believed that RSs can effectively extend the coverage and enhance throughput of a network, integrating RSs into the system can bring as many challenges as benefits. Much more sophisticated network planning is required to make full use of RS’s functionality and to optimize the performance of a relay-assisted wireless access network.
In this dissertation, we study several critical issues for wireless relay networks. The first is the network deployment problem. We analyze the impacts of deployment locations on system performances for different types of network nodes. Considering different deployment scenarios and user distributions, we propose deployment strategies determining which types of stations should be deployed and their deployed locations, under a budget constraint. Due to the capacity limitation at each relay station, simply having each relay station independently relay traffics for their serving base station can only achieve limited performance gain, which motivates us to propose the concept of relay station cooperation. The second problem we studied is therefore how to coordinate relay stations to cooperatively serve the downstream users such that system capacity can be maximized without sacrificing fairness. Through analyzing the impacts of relay cooperation on its coverage and downstream rate, we have mathematically formulated this problem, and propose joint relay cooperation and resource assignment solution. The effect of relay station placement on the performance of relay station cooperation is also studied. The last problem tackled is how to select data forwarding strategies for relay stations when network coding is enabled for multi-cast data repair. We propose a Markov decision process to characterize the data forwarding process, by which a delay-optimal dynamic programming algorithm as well as two light-weight on-line heuristics are derived. To summarize, several critical issues induced when integrating relays into a wireless access network are studied in this dissertation. We believe that our analysis and observations are indispensible for the planning and performance optimization of next generation wireless relay network.
Subjects
wireless relay networks
network planning
optimization
Type
thesis
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