Wireless Technology Essay

5264 Words Sep 12th, 2012 22 Pages
IEEE 802.15.4: a wireless communication technology for large-scale ubiquitous computing applications
Anis Koubâa, Mario Alves, Eduardo Tovar
PP-HURRAY! Research Group, Polytechnic Institute of Porto Rua Dr. Antonio Bernardino de Almeida, 431, 4200-072 Porto, PORTUGAL {akoubaa, emt}@dei.isep.ipp.pt, mjf@isep.ipp.pt

Abstract. Wireless Sensor Networks (WSNs) have been attracting increasing interest for supporting a new generation of ubiquitous computing systems with great potential for many applications such as surveillance, environmental monitoring, health care monitoring or home automation. However, the communication paradigms in WSNs differ from the ones associated to traditional wireless networks, triggering the need for new
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IEEE 802.15.4/IEEE 802.11b coexistence problem. The deployment of IEEE 802.15.4 WPANs in the presence IEEE 802.11b WLANs (IEEE 802.11 Specification 1999) triggers some inherent problems since they both operate in the 2.4 GHz frequency band. Coexistence between both technologies has become an important issue after the

proposal of the IEEE 802.15.4 standard and has been subject of recent research works. In (Howitt and Gutierrez 2003), the authors analyzed the impact of an IEEE 802.15.4 network composed of several clusters on an IEEE 802.11b station communicating with a WLAN access point. An expression of the probability of an IEEE 802.11b packet collision due to the interference with IEEE 802.15.4 has been proposed. The authors conclude that the IEEE 802.15.4 network has little to no impact on the performance of IEEE 802.11b, unless the IEEE 802.11b station is very close to an IEEE 802.15.4 cluster with high activity level. A later work in (Shin et al. 2005) analyzed the packet error rate of IEEE 802.15.4 WPANs under the interference of IEEE 802.11b WLAN and proposed some coexistence criteria for both standards. The results of this work show that the interference caused by the IEEE 802.11b WLAN does not affect the performance of an IEEE 802.15.4 WPAN if the distance between the IEEE 802.15.4 nodes and the IEEE 802.11b WLAN is larger than 8 m. Moreover, if the frequency offset is

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