Modeling the impact of deferred transmission in CSMA/CA algorithm of IEEE 802.15. 4 for acknowledged and unacknowledged traffic

Saeed Ur Rehman, Stevan Berber, Akshya Swain, Wayne Holmes

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review


IEEE has introduced the 802.15.4 standard for a low rate, low power, low complexity and short range Wireless Personal Area Network (WPAN) in 2003. The basic access mechanism used by the standard is the Carrier Sense Multiple Access with Collision Avoidance (CSMA/CA). It has been noted that there is a problem of low throughput for short superframe duration due to the collision of the packets at the start of the superframe. Hence in 2006, the standard was re-
vised and the CSMA/CA algorithm was modified such that deferred transmission was assigned with another delay of random backoff periods before assessing the medium. The objective of the present study is to develop an accurate analytical model to represent the actual CSMA/CA algorithm as reported in IEEE 802.15.4/2006. Additionally, the effects of deferments on the performance of CSMA/CA have been analyzed for acknowledged and unacknowledged data traffic, which has not been investigated yet. It has been found that the deferment of packets to a new superframe signicantly affects the throughput for short frame durations. The effect is more pronounced for acknowledged data traffic as
more collisions occur due to acknowledged packets and as a result, the node wastes more battery power by retransmitting the data. The collision can be avoided by assigning another delay with a random backoff period before assessing the medium. The results reported in this paper have further validated our simulation results for the deferred transmission.
Original languageEnglish
Title of host publicationProceedings of the 8th ACM Symposium on Performance evaluation of wireless ad hoc, sensor, and ubiquitous networks
Place of PublicationUnited States of America
PublisherAssociation for Computing Machinery, Inc
Number of pages8
ISBN (Print)9781450309004
Publication statusPublished - 2011
Externally publishedYes
EventMSWiM '11: The 14th ACM International Conference on Modeling, Analysis and Simulation of Wireless and Mobile Systems - Miami, United States
Duration: 3 Nov 20114 Nov 2011


ConferenceMSWiM '11
Country/TerritoryUnited States


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