Adaptive Power Control Protocol With Hardware Implementation for Wireless Sensor and RFID Reader Networks

Kainan Cha, S. Jagannathan, David Pommerenke

Research output: Contribution to journalArticle

Abstract

The development and deployment of radio frequency identification (RFID) systems render a novel distributed sensor network which enhances visibility into manufacturing processes. In RFID systems, the detection range and read rates will suffer from interference among high-power reading devices. This problem grows severely and degrades system performance in dense RFID networks. Consequently, medium access protocols (MAC) protocols are needed for such networks to assess and provide access to the channel so that tags can be read accurately. In this paper, we investigate a suite of feasible power control schemes to ensure overall coverage area of the system while maintaining a desired read rate. The power control scheme and MAC protocol dynamically adjust the RFID reader power output in response to the interference level seen during tag reading and acceptable signal-to-noise ratio (SNR). We present novel distributed adaptive power control (DAPC) as a possible solution. A suitable back off scheme is also added with DAPC to improve coverage. A generic UHF wireless testbed is built using UMR/SLU GEN4-SSN for implementing the protocol. Both the methodology and hardware implementation of the schemes are presented, compared, and discussed. The results of hardware implementation illustrate that the protocol performs satisfactorily as expected.

Original languageEnglish
Pages (from-to)145-159
Number of pages15
JournalIEEE Systems Journal
Volume1
Issue number2
DOIs
Publication statusPublished - 1 Jan 2007
Externally publishedYes

Keywords

  • Coverage optimization
  • distributed power control
  • frequency interference
  • radio frequency identification (RFID)
  • reader collision
  • sensor networks

ASJC Scopus subject areas

  • Control and Systems Engineering
  • Information Systems
  • Computer Science Applications
  • Computer Networks and Communications
  • Electrical and Electronic Engineering

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