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Wireless Networks
Erschienen in: Wireless Networks 8/2015

01.11.2015

Dynamic backoff scheduling of low data rate applications in wireless body area networks

verfasst von: Nesae Mouzehkesh, Tanveer Zia, Saman Shafigh, Lihong Zheng

Erschienen in: Wireless Networks | Ausgabe 8/2015

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Abstract

Reliability stands as the first important factor when dealing with medical data within the context of a wireless body area network (WBAN). The sensor nodes on body send their data to the coordinator based on a beacon-enabled access mode defined in IEEE 802.15.4 medium access control (MAC) specifications. This paper studies an effective backoff resolution into the carrier sense multiple access with collision avoidance (CSMA/CA) procedure of the beacon-enabled access mode of IEEE 802.15.4. Whilst the standard introduces the backoff as a resolution to less probability of identical backoffs, it does not address the efficiency of the generated backoff time in non-identical backoff situations. This phenomenon degrades the reliability of the received data at the coordinator device. A dynamic and reliable MAC algorithm for WBAN is presented in which length of the backoff period for each node gets decided based on its past successful trials in accessing the channel and also its data rate. This encourages a fair access to the medium among all the sensor nodes as moderate backoff values are assigned to each node. The primary contributions in this paper are less delay endured and higher data reliability while making no changes to the level of energy efficiency.
Vorheriger Artikel An RSSI-based localization algorithm for outliers suppression in wireless sensor networks
Nächster Artikel Radio resource management based on reused frequency allocation for dynamic channel borrowing scheme in wireless networks

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Fußnoten
1
In this application one node takes the role of a PAN coordinator in a beacon-enabled 802.15.4 PAN, it transmits periodic beacons and waits for incoming DATA frames. A second node acts as a device, it first scans the pre-defined channel for beacons from the coordinator and once it finds a beacon it tries to synchronize to and track all future beacons. It then starts to transmit DATA frames to the coordinator as fast as possible (direct transmission in the contention access period, CAP).
 
2
The FatFs implementation is a direct port of the ChaN FatFs project (http://​elm-chan.​org/​fsw/​ff/​00index_​e.​html) to TinyOS.
During testing of the initial port, Victor Cionca at University of Limerick discovered a great deal of overhead in the file system's cluster window operations, and devised an improved method to handle these without compromising the integrity of the fs.
 
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Metadaten
Titel
Dynamic backoff scheduling of low data rate applications in wireless body area networks
verfasst von
Nesae Mouzehkesh
Tanveer Zia
Saman Shafigh
Lihong Zheng
Publikationsdatum
01.11.2015
Verlag
Springer US
Erschienen in
Wireless Networks / Ausgabe 8/2015
Print ISSN: 1022-0038
Elektronische ISSN: 1572-8196
DOI
https://doi.org/10.1007/s11276-015-0929-9

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