Wireless Personal Area Networks: Performance, by Jelena Misic, Vojislav Misic

By Jelena Misic, Vojislav Misic

Instant own sector Networks presents an in-depth research of the new IEEE 802.15.4 commonplace for low information price instant own region networks (LR-WPANs), together with feedback to enhance functionality and comparisons with the comparable 802.15.1 (Bluetooth) typical. It assesses the suitability of the normal for the advance and deployment of instant sensor networks in addition to supplying assistance and perception into the relative merits and drawbacks of varied functionality solutions. 

instant own region Networks:

  • Provides a finished, in-depth examine the problems surrounding WPAN community operation and function.
  • Investigates multi-cluster networks and compares how they are often applied.
  • Analyzes the functionality of a unmarried cluster less than various site visitors and gear administration regimes together with uplink vs. downlink site visitors, stated vs. unacknowledged site visitors, saturation vs. non-saturation, and so forth.
  • Discusses safeguard matters in WPANs similar to varied safeguard threats, their impression on functionality, typical defense mechanisms, and safety regulations.
  • Compares the IEEE 802.15.4 typical with the similar Bluetooth IEEE 802.15.1 average by way of suitability for imposing instant sensor networks.

This reference is a invaluable software for builders and researchers getting familiar with numerous features of IEEE 802.15.4 expertise. Graduate scholars learning classes equivalent to functionality assessment, instant Sensor Networks and Queuing concept also will locate this ebook very insightful.

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Extra resources for Wireless Personal Area Networks: Performance, Interconnection, and Security with IEEE 802 15 4

Example text

The traffic in sensor networks is rather asymmetric, as the bulk of it flows from the sensing nodes toward the network sink (this is often referred to as the uplink direction). The traffic in the opposite direction is generally much smaller and consists of control information and, possibly, queries issued by the network sink on behalf of the corresponding sensing application (Intanagonwiwat et al. 2003). Furthermore, traffic patterns in sensor networks are rather different than in ad hoc networks.

Leaving the cluster. A device may decide to leave (or ‘disassociate from’) the cluster it currently belongs to, which is accomplished by sending a disassociation notification to the coordinator. A device may also be asked to leave by the cluster coordinator, which prepares a disassociation command to be sent (in the form of a downlink packet) to the device. This command may be directly sent to the device, or a regular downlink procedure may be used. In the latter case, the coordinator announces the pending downlink packet in the beacon frame; the device must then explicitly request that this packet is transmitted.

In our analysis, we consider both acknowledged and non-acknowledged transmission, as different applications may need to employ one or the other approach. 1. THE SYSTEM MODEL – PRELIMINARIES 43 Non-acknowledged transfer. In the case of non-acknowledged transmission, the sending node does not request the acknowledgment of the packets which are successfully received by the cluster coordinator, and the coordinator does not acknowledge them. As a result, any packets that might be lost due to noise and interference (at the PHY layer), or collisions at the MAC layer, will not be re-transmitted.

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