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Abstract: In this paper we modify the DSR protocol for energy consumption and also study the comparison of various routing protocol. DSR protocol is on demand source routing protocol .source routing means when source initiate route discovery process then It finds routes from source to destination .but in DSR more energy consumption. To modify the mechanism of DSR for route selection procedure.In this paper we propose EDSR protocol which reduces the total energy consumption in the network by selecting minimum energy consuming path.
It is simulated in NS2 and visualize by nam (network animator).
Keywords: – routing protocol, mobile ad-hoc networking, EDSR, energy consumption.
Ad-hoc-network are wireless network where each node communicate with each other. Each node in the network as forwarding and receiving packet. Due to this all nodes are considered as router. The main goal of such Ad-hoc network routing protocol is to find suitable route between pair of node to consume the less energy among the nodes and maximize the network lifetime. In this paper to modify packet structure of DSR protocol to achieve desired mechanism
Mobile ad hoc networks can be used in many applications, ranging from sensors for environment, Military scenarios, vehicular ad hoc communications, Rescue operation, data network, road safety, health, home, peer-to-peer messaging, Free Internet Connection Sharing, and Sensor Network, air/land/navy defense, weapons, robots, etc.
Routing protocol is used to discover routes between nodes there by communication within network. The main goal of such an Ad-hoc network routing protocol is establish efficient route between pair of node. In this way message may be delivered .A large number of protocol are available for this purpose. Routed protocol is provide sufficient information in its network layer address to allow a packet to be forwarded from host to host based on the addressing scheme. They give the format and use of the fields within a packet. Packets are generally conveyed from end system to end system. IP (Internet Protocol), Telnet, RPC (Remote Procedure Call), SNMP, SMTP are examples of routed protocols.
Each routing protocol has some specific domain and purpose in which this is used. This are some aspects that should take into consideration that is Network size/scalability, Limited physical security , existing routing protocols, Geographical area, Energy-constrained operation, Quality of service, existing routing protocols. Routing protocol are categorized in main three categories. A] Table Driven Protocols. B] On Demand Protocols. C] Hybrid Protocols.
The Table Driven Routing Protocol, also known as Proactive Protocols , Each node uses routing information to store the location information of other nodes in the network in routing table and this information is then used to move data in to different nodes in the network. DSDV are the examples of a Table Driven Protocol. On Demand Routing Protocol, also known as Reactive Protocols When They are required to route data packet by a source node to a destination for which it does not have route information, then route is established by a route discovery process which goes from one node to the other until it arrives at the destination or a node in between has a route to the destination. AODV and DSR are the Example. Hybrid Routing Protocols: Hybrid routing protocol this is combination of Table Based Routing Protocols with On Demand Routing Protocols. They use distance vectors algorithm to find the best paths to destination networks and when there is a change in the topology of the network report routing information immediately. Each node keeps a record of routing information for its own zone, the size of routing zone which is defined by a zone radius, which is defined by a metric such as the number of hops.
Sr.no AODV DSR DSDV
Protocol It is also on demand that is Reactive
Protocol It is table driven that is Proactive
end to end delay It has low
end to end delay It has high for
Pause time 0 but it starts decreasing as time increases.
better for larger number of nodes It performs
better for larger number of nodes It performs
better for few number of nodes
traffic AODV is preferred For real
time traffic DSR is not preferred For real time
traffic DSDV is not preferred
Comparison between AODV, DSR and DSDV
Selected Protocol: Dynamic Source Routing
DSR is simple and efficient a popular flat on demand reactive ad hoc routing protocol. One of the primary characteristics of DSR is that it is strictly source routing protocol that means data packets contain strict source routes that specify each node along the path to the destination. Source routes collect Route request (RREQ) and route reply (RREP) packets so that once a route is discovered, the source learns the entire source route and can place that route into subsequent data packets The basic mechanism of DSR includes route discovery and route maintenance.
a. Route Discovery
This is the mechanism in which whenever node send data to destination node which is not in transmission range therefore it first find route to that node by launching the Route discovery mechanism. Figure shows the Route discovery mechanism. Normally the sender must first search this route in its route cache if there is no route it proceeds as follow:
b. Route Reply
Figure shows the Route reply mechanism. This procedure is executed by a node after receiving a route request destined to him thus this node executes the following actions:
c. Route Maintenance
When forwarding a packet each intermediate node is responsible for the packet is correctly received by the next node, but some situation like dynamic topology where a node doesn’t receive the acknowledgement of reception from link layer of a given packet, therefore it resends the same packet it until reaches a predefined value of attempts. Whenever this number of attempts was reached this node consider this link as broken than it deletes each route containing this link from its cache than it generates a route error packet to inform the source node and all intermediate nodes about this link failure so in the same way each intermediate node deletes all routes containing this route until the route error packet arrives to its destination to find a new route in its route cache.
d. Route Cache
The route cache in DSR is used to save the frequently used routes in order to avoid new route discovery mechanism which consumes lot of network resources, a node can also learns from route request to adds new routes to its cache it also learns from route error packets to update its cache.
We have proposed an Energy Efficient Dynamic Source Routing (EDSR) protocol which is based on Transmission power control approach and Load balancing approach. To reduce the transmission energy we are using a hop-by-hop power control mechanism and for load balancing it will select the nodes which is having the least remaining power. Here during the route discovery phase itself we are calculating the minimum energy required to communicate to the node which sends the request to it. At the same time we observe each nodes remaining power to avoid a route which is having a tendency to die out. The destination node will make a decision about the selection of best route among the multiple requests that reaches to it and sends reply packet to the destination through the selected route. In this way the minimum energy routing protocol is designed and implemented by making changes in the minimum-hop fixed-transmit power version of DSR.
NS-2 is open source discrete event simulator provides considerable support for simulation of TCP, routing, multicast protocols over wired and wireless (local and satellite) networks, etc. It uses Tcl and Object Tcl shell as interface allowing the input file (simulation script) to describe the model to simulate and C++ core methods used. Users can define arbitrary network topologies composed of nodes, routers, links and shared media. A rich set of protocol objects can then be attached to nodes, usually as agents. To analyze the trace files, other independent tools will be needed to filter, compute and display the result example-awk, matlab etc. The simulator suite also includes a graphical visualizer called network animator (nam) to assist the users get more insights about their simulation by visualizing packet trace data.
Simulator Used NS-2
Protocol under test DSR,EDSR
Dimension of simulation area
Table No.1- Parameter used.
A. Scenario 1: Simulation of DSR protocol with 10 Nodes
In this scenario simulation of DSR is performed with 10 nodes. Nodes in the simulation scenario are at same position. We can see the network animator up to 240 nodes at a particular instant.
B. Scenario 2: Simulation of ESDSR protocol with 10 Nodes
The network animator shows the simulation of 10 nodes of ESDSR protocol. Nodes in the simulation scenario are at same position. The figure shows the NAM for ESDSR for 10 nodes.
C. Scenario 3: Average Energy consumption-
Average energy consumption is the ratio of total energy consumed by all the nodes in the network by the number of nodes. The figure shows the graph of average energy consumption vs. number of nodes and the nodes in EDSR will consume less energy as compare to the nodes in DSR. The green line shows the average energy consumption of DSR and red line shows the average energy consumption of EDSR on different number of nodes. We compare the values of average energy consumption on different number of node.
EDSR protocol for ad-hoc networks works fine, but it runs under some assumptions. This implementation works fine with less number of nodes, when the number of nodes increase then due to no much functionality in send buffer we face lot of problems like upper layers start to retransmit the packet again when it does not get an acknowledgement for the packet. In future implementations if these optional features are implemented then this implementation can be used for real ad hoc network
In designing the routing protocol there are lot of problem but Energy efficiency is the main problem. Modifying the DSR protocol less energy consumed.
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