Throughput Analysis of Multi-Hop CSMA/CA Wireless Networks

Lauwens, Ben; Scheers, Bart; Capelle, Antoine Van de

doi:10.1109/sarnof.2008.4520073

Cited by 2 publications

(2 citation statements)

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“…A complete analysis of the impact of hidden nodes on the DCF is given in [19] with an emphasis on the starvation effects. In [20] the concept of a transmission link, a specific transmitter-receiver pair, is introduced to evaluate the saturation throughput which is highly directional in the case of a network with an arbitrary topology.…”

Section: Related Workmentioning

confidence: 99%

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Performance analysis of unslotted CSMA/CA in wireless networks

2009

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In this paper a novel analytical model for the saturation throughput of unslotted Carrier Sensing Multiple Access with Collision Avoidance (CSMA/CA) in wireless networks is proposed. A fixed point procedure is developed based on the interaction of the Physical layer (PHY) and the Medium Access Control sub-layer (MAC). The output of the Clear Channel Assessment (CCA), i.e. idle or busy medium in the neighborhood of a node, serves as a feedback mechanism for the dynamical scheduling rate controlled by the back-off procedure. The PHY is described by a renewal process between successful transmissions with failed attempts and collided packets in between. A semi-Markov process of the internal states of a node is used as a model for the MAC. An event-driven simulator for the non-beacon enabled IEEE Std 802.15.4™MAC is developed to verify the numerical results of the analytical method. A detailed analysis of the idle period after a transmission is carried out based on the proposed analytical approach. The probability that the CCA senses the channel idle depends clearly on the actual back-off stage and the first back-off expiration after a transmission cannot be modeled by a exponential distribution when a finite number of nodes are in contention. The output of the event-driven simulations confirms both statements in great detail and the saturated throughput evaluated B. Lauwens ( ) · B. Scheers CISS, Royal Military Academy, 30 Renaissancelaan,

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Section: Related Workmentioning

confidence: 99%

“…The vulnerable period in which simultaneous CCAs can happen has a duration T Rx→T x after the start of the first CCA. The probability of success in a cycle where node i initiates the transmission period is given by (20) and the probability that a transmission is successful, γ , can be evaluated…”

Section: Non-persistent Csma Renewal Processmentioning

confidence: 99%