Ameliorate pursuance of TCP in CR-MANET utilizing accessible resources

Abstract

Cognitive Radio (CR) networks is well-known for its expertness in solving the problem of spectrum scarcity that reside with wireless resources where unlicensed users can opportunistically perform transmission without impacting the operations of licensed users. Channel switching is inherently necessary to make unlicensed and licensed users to appropriate propagation in the channel. All through the progression, communication characteristics such as bottleneck bandwidth and Round-trip time (RTT) have to be modified. However this change has to adaptively update by TCP in its congestion window (CWND) to make an efficient use of the available resources. TCP CRAHN is well-known mechanism which generates spectrum alertness by retrieving explicit feedback from relay and destination nodes. In this paper we proposed TCP CR-MANET and it is evaluated with respect to bottleneck bandwidth and RTT varying characteristics. This protocol updates its CWND based upon the available buffer space of the relay node. TCP CRMANET system is implemented in NS2 simulator and analyzed with various characteristics of the network. Experimentally, it has been proved that our proposed TCP CR-MANET provides better throughput with respect to TCP CRAHN.