IEEE 802.15.4 low rate - wireless personal area network coexistence issues
IEEE 802.15.4 is a proposed standard addressing the needs of low-rate wireless personal area networks or LR-WPAN with a focus on enabling wireless sensor networks. The standard is characterized by maintaining a high level of simplicity, allowing for low cost and low power implementations. Its operational frequency band includes the 2.4 GHz industrial, scientific and medical band providing nearly worldwide availability; additionally, this band is also used by other IEEE 802 wireless standards. Coexistence among diverse collocated devices in the 2.4 GHz band is an important issue in order to ensure that each wireless service maintains its desired performance requirements. This paper presents a brief technical introduction of the IEEE 802.15.4 standard and analyzes the coexistence impact of an IEEE 802.15.4 network on the IEEE 802.11b devices.
Performance analysis of low rate wireless technologies for medical applications
In this article, we discuss what wireless technologies can be used for medical applications and how well they perform in a healthcare/hospital environment. We consider the emerging low-rate Wireless Personal Area Network technology as specified in the Institute of Electrical and Electronics Engineers 802.15.4 standard and evaluate its suitability to the medical environment. We focus on scalability issues and the need to support tens of communicating devices in a patient's hospital room. We evaluate the effect of packet segmentation and backoff parameter tuning to improve the overall network performance that is measured in terms of packet loss, goodput, and access delay. We also evaluate the performance of 802.15.4 devices under interference conditions caused by other 802.15.4 devices and by wireless local area networks using IEEE 802.11b.
Overview of the IEEE 802.15.4 standards family for Low Rate Wireless Personal Area Networks
Low Rate Wireless Personal Area Networks (LR-PAN) such as sensor networks have become very popular in recent years. These networks can be implemented with little or no infrastructure. The first step of standardization for such LR networks was taken in 2003 when the IEEE 802.15.4 was approved. This standard however went through an enhancement process and a newer version was released in 2006 known as the IEEE 802.15.4–2006 (or 802.15.4b) standard. However neither of the two standards supported ranging capabilities between nodes in the network. In order to support distance and hence location information, the IEEE 802.15.4–2007 was approved (also known as 802.15.4a). Standardization process continued and newer standards such as the IEEE 802.15.4c and 4d were sanctioned very recently. This paper reviews the network topologies, physical and MAC layers of the IEEE 802.15.4 family.
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