A unified cross-layer framework for resource allocation in cooperative networks

Wei Chen, Lin Dai, Khaled Letaief, Zhigang Cao

Research output: Contribution to journalArticle

62 Citations (Scopus)

Abstract

Node cooperation is an emerging and powerful solution that can overcome the limitation of wireless systems as well as improve the capacity of the next generation wireless networks. By forming a virtual antenna array, node cooperation can achieve high antenna and diversity gains by using several partners to relay the transmitted signals. There has been a lot of work on improving the link performance in cooperative networks by using advanced signal processing or power allocation methods among a single source node and its relays. However, the resource allocation among multiple nodes has not received much attention yet. In this paper, we present a unified cross-layer framework for resource allocation in cooperative networks, which considers the physical and network layers jointly and can be applied for any cooperative transmission scheme. It is found that the fairness and energy constraint cannot be satisfied simultaneously if each node uses a fixed set of relays. To solve this problem, a multi-state cooperation methodology is proposed, where the energy is allocated among the nodes state-by-state via a geometric and network decomposition approach. Given the energy allocation, the duration of each state is then optimized so as to maximize the nodes utility. Numerical results will compare the performance of cooperative networks with and without resource allocation for cooperative beamforming and selection relaying. It is shown that without resource allocation, cooperation will result in a poor lifetime of the heavily-used nodes. In contrast, the proposed framework will not only guarantee fairness, but will also provide significant throughput and diversity gain over conventional cooperation schemes.

Original languageEnglish
Article number4600213
Pages (from-to)3000-3012
Number of pages13
JournalIEEE Transactions on Wireless Communications
Volume7
Issue number8
DOIs
Publication statusPublished - Aug 2008
Externally publishedYes

Fingerprint

Cooperative Networks
Cross-layer
Resource Allocation
Resource allocation
Vertex of a graph
Relay
Diversity Gain
Network layers
Beamforming
Fairness
Antenna arrays
Wireless networks
Signal processing
Energy
Throughput
Antennas
Cooperative Transmission
Decomposition
Multi-state
Antenna Arrays

Keywords

  • Convex optimization
  • Cooperative networks
  • Cross-layer design
  • Fairness
  • Lifetime
  • Resource allocation

ASJC Scopus subject areas

  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering

Cite this

A unified cross-layer framework for resource allocation in cooperative networks. / Chen, Wei; Dai, Lin; Letaief, Khaled; Cao, Zhigang.

In: IEEE Transactions on Wireless Communications, Vol. 7, No. 8, 4600213, 08.2008, p. 3000-3012.

Research output: Contribution to journalArticle

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