By Manu Sood, Amol Vasudeva (auth.), Nabendu Chaki, Natarajan Meghanathan, Dhinaharan Nagamalai (eds.)
Computer Networks & Communications (NetCom) is the court cases from the Fourth overseas convention on Networks & Communications. This e-book covers conception, technique and functions of computing device networks, community protocols and instant networks, facts conversation applied sciences, and community safety. The court cases will characteristic peer-reviewed papers that illustrate study effects, initiatives, surveys and commercial reviews that describe major advances within the various parts of laptop networks & communications.
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Additional resources for Computer Networks & Communications (NetCom): Proceedings of the Fourth International Conference on Networks & Communications
For this reason, energy consideration has dominated most of the research at MAC layer level in wireless sensor networks. The concepts of latency, throughput and delay were not primary concerns in most of the presented work on sensor networks. We propose a new energy efficient medium access control mechanism with quality of service support for cluster based wireless sensor networks. It uses a both scheduled (TDMA) and contention based (CSMA) medium access schemes. It differentiates between short and long messages; long data messages are assigned scheduled TDMA slots, while short periodic control messages are assigned random access slots.
The result shows the reduction in control packets by introducing FGs. Our model divides a MANET of size N into k friendly groups with approx N/k number of nodes per group. The total control overhead in is N2 with flat structure and in FG (Hierarchical) structure it N2 /k which minimizes the throughput up to a ratio k: 1|k > 1. 2 Advantage of FG Model This model uses two NIC instead of virtual subnetting [24–26] because of the following advantages: • Simpler to design because it divides a MANET by involving NICs • Cost effective because dividing a network by employing NICs is very cheaper • Negligible performance overheads due to its design but in virtual subnetting nodes are authenticated using certificate that involve so many computations.
These protocols are based on Carrier Sense Multiple Access (CSMA) technique and have higher costs for message collisions, overhearing and idle listening. 11  is a well-known contention based medium access control protocol which uses carrier sensing and randomized back-offs to avoid collisions of the data packets. 11 protocol reduces the idle listening by periodically entering into the sleep state. This PSM mode is for the single-hop network where the time synchronization is simple and may not be suitable for multi-hop networks because of the problems in clock synchronization, neighbor discovery and network partitioning.