CONGESTION CONTROL AND AWARENESS FOR MULTIPATH ADHOC ENVIRONMENTS

Abstract

In Wireless Sensor Networks (WSNs) the congestion problem is quite different as compared to traditional wired networks. Mobile Ad hoc Networks (MANETs) suffer from the dangers of congestion due to the problem of few resources. Due to the nature of a wireless channel that is dynamic in design, packet broadcasts suffer from the dangers of interruption and dwindling signal power. Data via a given path in heterogeneous ad hoc networks depends on the least possible data rate of all its paths. Most recent congestion control procedures attempt to lessen the congestion by dropping the rate at which the source nodes inoculate packets into the system. However, the proposed traffic control scheme introduces the dynamic active queue and variation of the link expiration time. If a node with a high data rate directs traffic flow to another node with a low data rate, then the possibility of congestion is high, this will lead to long queuing postponements. The recommended protocol makes use of a hop-by-hop congestion aware routing approach that monitors the buffer levels at each intermediary node. The multipath route establishment uses the method that discovers multiple multi hops communication between source and destination. Multi-path routing can stabilise the load more superior than the solitary route routing in ad hoc systems, thus decreasing the congestion by separating the traffic into numerous paths. This research presents a new approach of Multipath Load Balancing with AOMDV routing protocol and Dynamic Queue based congestion control approach for evading congestion in system communication flows. In this scheme the store and forwarding capability of nodes are enhanced by varying the queue length according the number of packets presently being dropped. The multipath routing performance in this technique will increase the link expiration time with vibrant queue length method. The multipath routing is no doubt better than the unipath routing and balance the load by proving the alternative path if the already established path are congested. Consequently, there has been an greater than before attentiveness in examining Active Queue Management (AQM) in wireless nodes so as to lessen the queue dormancy and meet the difficulties of time thoughtful uses. In this study, we largely concentrate on investigating the effectiveness of multipath routing and a newly propounded AQM tool termed Controlled Delay (CoDel). We examine the usefulness of multipath routing that incorporate CoDel (AOMDVCCA) by implementing simulations in NS-2 and paralleling its working with normal unipath and multipath protocols in wireless network situations. Founded on the simulation Department of Computer Engineering, DTU Page ii outcomes attained, we deliberate the benefits and deficiencies of AOMDVCCA in relation to packet drop rate and average queue length.