Optimal relay station placement in broadband wireless access networks

Bin Lin, Pin Han Ho, Liang Liang Xie, Xuemin Sherman Shen, János Tapolcai

Research output: Contribution to journalArticle

77 Citations (Scopus)


To satisfy the stringent requirement of capacity enhancement in wireless networks, cooperative relaying is envisioned as one of the most effective solutions. In this paper, we study the capacity enhancement problem by way of Relay Stations (RSs) placement to achieve an efficient and scalable design in broadband wireless access networks. To fully exploit the performance benefits of cooperative relaying, we develop an optimization framework to maximize the capacity as well as to meet the minimal traffic demand by each Subscriber Station (SS). In specific, the problem of joint RS placement and bandwidth allocation is formulated into a mixed-integer nonlinear program. We reformulate it into an integer linear program which is solvable by CPLEX. To avoid exponential computation time, a heuristic algorithm is proposed to efficiently solve the formulated problem. Numerical analysis is conducted through case studies to demonstrate the performance gain of cooperative relaying and the comparison between the proposed heuristic algorithm against the optimal solutions.

Original languageEnglish
Article number5089328
Pages (from-to)259-269
Number of pages11
JournalIEEE Transactions on Mobile Computing
Issue number2
Publication statusPublished - Feb 1 2010



  • Cooperative relaying
  • Decode-and-forward
  • Placement problem

ASJC Scopus subject areas

  • Software
  • Computer Networks and Communications
  • Electrical and Electronic Engineering

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