COEXISTENCE OF STANDARDIZED WIRELESS SYSTEMS IN THE 2.4 GHZ-ISM-BAND

Axel Sikora,Voicu F Groza

doi:10.47839/ijc.4.1.318

Abstract

Wireless systems continue to rapidly gain popularity. This is extremely true for data networks in the local and personal area, which are called WLAN and WPAN, respectively. However, most of those systems are working in the license-free industrial scientific medical (ISM) frequency bands, where neither resource planning nor bandwidth allocation can be guaranteed. To date, the most widespread systems in the 2.4 GHz ISM band are IEEE802.11 and Bluetooth, with ZigBee and IEEE802.15.4 as upcoming standards for short range wireless networks. In this paper we examine the mutual effects of these different communication standards. Measurements are performed with real-life equipment, in order to quantify coexistence issues.

Highlights

Wireless systems continue to rapidly gain popularity
The worst case scenario is to run IEEE802.11b and IEEE802.15.4 systems with overlapping channels, e.g. the WLAN system transmits on channel 6 (2437 MHz) and the WPAN system on channel 16 (2440 MHz)
That those IEEE802.15.4 frames, which are overlapped by a IEEE802.11 frame are destroyed

Summary

INTRODUCTION

Wireless systems continue to rapidly gain popularity This is extremely true for data networks in the local and personal area, which are called WLAN and WPAN, respectively. Most of those systems are working in the license-free industrial scientific medical (ISM) frequency bands, where neither resource planning nor bandwidth allocation can be guaranteed. Other non-networking systems may emit electromagnetic waves, i.e. microwave ovens in the 2.4 GHz-band. Other non-networking systems may emit electromagnetic waves, e.g. microwave ovens in the 2.4 GHz-band. The coexistence issues of the new IEEE802.15.4 and ZigBee devices were examined in first simulations [16], but no quantitative measurements have yet been documented. The impact of the three most important interfering systems on IEEE802.15.4 is reviewed, i.e. of IEEE802.11, of Bluetooth, and of microwave ovens

Definitions

TEST RESULTS

Test Scenario 3

COMPARISON WITH SIMULATED DATA

CONCLUSION