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Visu, P.
- Multiple Channels Utilization in Collision Free MAC Protocol for Wireless Ad Hoc Networks
Authors
1 Department of Computer Science and Engineering, Veltech Dr.RR & Dr.SR Technical University, Chennai, IN
Source
Wireless Communication, Vol 3, No 16 (2011), Pagination: 1155-1159Abstract
Wireless ad hoc network, though it is not structured by itself, represents a powerful communication infrastructure. The distributed and flexible architecture of wireless ad hoc networks is a key factor; however, their wide deployment relies on protocols capable of providing energy optimization, high channel utilization, support for real time traffic, etc. In such a context, recently a Collision Free MAC protocol has been proposed. Its effectiveness has been already investigated showing significant improvements compared to the Standard IEEE 802.11, in terms of throughput, one way packet delay, energy consumption and support of real time traffic. This paper suggests a means for utilization of multiple parallel wireless channels and proposes an enhanced version called ECF-MAC, by imposing all stations to stay awake and ready to receive during the access window. Therefore, a transmitting station will surely find awake its destination station.Keywords
Collision Free MAC, Power Saving, Wireless Networks, Variable Time Slot.
- A New Random 2ACK Technique for Detection of Selfish Nodes in a Mobile Ad-Hoc Network
Authors
1 Department of CSE, Vel Tech Dr.RR & Dr.SR Technical University, Chennai, IN
2 Dept of ECE, Vel Tech Engineering College, Chennai, IN
Source
Wireless Communication, Vol 3, No 16 (2011), Pagination: 1160-1164Abstract
A mobile ad hoc network (MANET) is a temporary infrastructure less network, formed by a set of mobile hosts. It dynamically establishes its own network without relying on any central administration. In a MANET each device is free to move independently in any direction, and will therefore change its links to other devices frequently. Mobile ad hoc networking works properly only if the participating nodes cooperate in routing and forwarding. However, performing network functions consumes energy and other resources. To save its energy a node may behave selfishly and uses the forwarding service of other nodes without correctly forwarding packets for them. These nodes must be identified and excluded from the cooperative part of the network, as they only consume resources and don’t contribute to the infrastructure. In MANET’s routing misbehavior can severely degrade the performance at the routing layer. Specifically, nodes may participate in the route discovery and maintenance process but refuse to forward data packets. Some solutions have been recently proposed to detect and mitigate such selfish nodes, but almost all these solutions rely on the watchdog technique in their monitoring components, which suffers from many problems. This paper proposes a new approach to mitigate some of the above problems. A misbehavior detection system aims at removing the MANET vulnerability. In this approach a system is built to detect misbehaving nodes in mobile ad hoc networks.