Medium access control layer has been the hotbed of research in the field of wireless sensor networks since huge amount of research in wireless sensor networks has focused on saving energy and lately reducing latency. For the most part, medium access control layer solutions in wireless sensor networks are entrusted to save energy, to reduce latency, and at times to ensure reliability perhaps through cross-layer solutions. In this article, we review the surveys at medium access control layer and point to readers some of their strengths and relevancies to medium access control layer protocols. Furthermore, we classify the surveys subject-wise to show trend and usability. To cross compare, we devise a unified lexicon for the purpose and expose the coverage given to the wireless sensor networks' medium access control protocols by different studies. We present medium access control solutions' popularity on a known but hitherto unused metric: average citations/year from over 200 medium access control solutions. Our approach to assess the impact factor of protocols for ranking is validated prima facie from the coverage of these solutions by top ranking surveys. We believe it is the widest of such a study involving more than 30 survey papers and over 200 wireless sensor network medium access control protocols.

No abstract

No abstract

In this paper we extend our recent work [3] by analyzing the behavior of mobility scenario in saturation conditions for evaluating packet delays. For the first time we have shown that the normalized measure of dispersion for service time intervals and offered load dependency holds for multi-hop IEEE 802.11 wireless networks with mobile nodes, as well. Thus this paper not only extends and validates our previous results but also establishes that wireless mobile networks have the similar dependency pattern. We further extend this work by showing that the service time intervals do not follow exponential distribution but instead follow gamma distribution. The patterns for the shape parameters are also established for accurately computing average end-to-end packet delay for mobile networks. The analytical model presented in this paper has been verified through extensive simulations.Keywords-average end-to-end packet delay; multi-hop wireless mobile networks; normalized measure of dispersion and offered load dependency; routing

No abstract