Behavior of TCP over CBR:
The protocol which is mainly used for broadcasting the data both audio as well as video is UDP i.e. user datagram protocol the main advantage of this protocol is large constant bit rate broadcasting can be done through this protocol. Some restrictions are coming during the UDP protocol in order to back up the CBR this is because of firewalls and therefore it is confined to certain areas.
And very soon alternate studies gave a solution on how to handle the CBR and found that the already famous VOIP application is the successor of UDP which can handle the CBR for using it. In recent times TCP build strong base in loss healing mechanisms such as SACK so this is the main reason for transporting depending on TCP for real-time CBR work scenarios. The drastic improvement of mobile applications Always urge to develop a new quality of services standards (QOS) but most of the protocols failed while backing up these standards (QOS) and these again failed mainly in the mobile networks like MANETS. The main criteria for maintaining mobile multimedia necessities is to follow a vivid QOS standards and among them first5 one is to maintaining of constant bit rate of transmission.
The main flaw here is MANET’s energy conservation is very high for backing these mobile services and due to these TCP remains sufferer for this consequences for errors. There are many experiments done for developing the minimal energy consumption of TCP to improve the CBR around the MANET and many of them are error minimizing patterns.AODV is another different protocol which is known as hopping protocol because information they holds for a certain time and it is fixed an let it be 3 seconds for AODV routing protocol. In common an ordinary route entry is developed for an ideal time period but this may not work all the times but still it is considered. It is more beneficial to be short in lifetime span of time period for a route entry around the active routing protocols like AODV’s for MANET’s purpose.
Many of the times lifespan is confirmed by CBR which is nothing but constant bit rate. If this span is more then we cannot uphold the route and node information and tine is wasted forcalculations and as a whole the overall network size grows. It is recommended to revise the routing table than the developing of CBR data. As we know the dynamic and static environments vary the lifespan is fixed incase of static whereas dynamic this may not be work out for example in MANETS the nodes mobilization is the decision maker which decide the performance of the particular network.
The CBR period for every individual node should be fixed dynamically which follows the AODV network.The advantage in this is REQUESTS are sent from AODV protocol to each node by appending the CBR period field along with the message and transmitted around the network. After message is received by destination node the destination node reads the CBR time span message from the RREQ message and appends another CBR period with updating on the old one with new RREP message and in turn sends to the original one.
Therefore for each node a CBR period lifespan is created and depending upon the lifespan it automatically gets its connection lost and due to this the burden of the system is minimized. These heavy messages can easily be deleted once the dynamic CBR period field uses these RREQ and RREP messages that were transmitted by the usage of well-known AODV routing protocols across MANETS.
This paper is written and submitted by Sujana Priya V.