A Cross-Layer Approach to Multi-Hop Networking with Cognitive Radios

Abstract

Cognitive radio (CR) is an enabling technology for efficient use of available spectrum and promises unprecedented flexibility in multi-hop wireless networking. This paper explores networking related issues associated with CRs. Specifically, we consider how to maximize the rates of a set of user communication sessions in a multi-hop CR-based wireless network. Due to potential interference at the physical layer, we find that it is essential to follow a cross-layer approach, with joint optimization at physical (power control), link (frequency band scheduling) and network (flow routing) layers. We give a mathematical characterization of this cross-layer optimization problem. We develop a centralized solution procedure based on the branchand- bound framework. Using numerical results, we demonstrate the efficacy of the solution procedure and offer quantitative understanding on the joint optimization at different layers.

Open PDF

Document Details

Document Type
Technical Report
Publication Date
Nov 01, 2008
Accession Number
ADA536059

Entities

People

  • Sastry Kompella
  • Yantian Hou
  • Yi Shi

Organizations

  • Virginia Tech

Tags

DTIC Thesaurus Topics

  • Ad Hoc Networks
  • Algorithms
  • Bandwidth
  • Cognitive Radio
  • Computational Complexity
  • Data Rate
  • Engineering
  • Flow Rate
  • Frequency
  • Frequency Bands
  • Frequency Domain
  • Gaussian Noise
  • Networks
  • Optimization
  • Power Levels
  • Scheduling (Production)
  • Wireless Networks

Fields of Study

  • Computer science

Readers

  • Adaptive Control and Estimation with Uncertainty in Dynamic Systems.
  • Computer Networking
  • Radio communications and signal processing.