How to Simulate Route Access Protocol Projects Using MATLAB

To simulate Route Access Protocol (RAP) in MATLAB has numerous steps to follow and it is usually intended to handle the dynamic access to network resources by regulating the routes among nodes. In the aspects of wireless ad-hoc networks or Vehicular Ad-hoc Networks (VANETs), RAPs making sure those nodes can determine and access routes enthusiastically while allowing for network criteria such as congestion, mobility, or link failures.

To replicate a Route Access Protocol in MATLAB can be supposed of as handling route discovery, route maintenance, and route erasure in dynamic network criteria. The actions to replicate a general RAP that contain to generate a dynamic network, executing the route discovery process same as protocols such as AODV or DSR, and managing the dynamic variations in the network.

Here’s how to simulate a Route Access Protocol in MATLAB:

Steps to Simulate Route Access Protocol in MATLAB

1. Define Network Topology

• Describe the nodes in the network (vehicles or wireless devices) and generate links among them according to communication range or other condition.

Example of defining the network topology:

numNodes = 10;  % Number of nodes in the network

networkArea = 100;  % Define the size of the area (e.g., 100×100 meters)

nodePositions = rand(numNodes, 2) * networkArea;  % Random initial positions for nodes

communicationRange = 30;  % Communication range between nodes (in meters)

% Adjacency matrix for the network, where infinity means no link between nodes

adjacencyMatrix = inf(numNodes);

% Establish communication links based on distance

for i = 1:numNodes

for j = i+1:numNodes

distance = norm(nodePositions(i,:) – nodePositions(j,:));

if distance <= communicationRange

adjacencyMatrix(i,j) = distance;

adjacencyMatrix(j,i) = distance;

end

end

end

2. Route Discovery in RAP

• Similar to protocols such as AODV, route discovery in a Route Access Protocol includes dynamically determining routes only when necessary. This can be performed using Route Request (RREQ) and Route Reply (RREP) mechanisms.

Example of executing route discovery using a breadth-first search (BFS):

function route = RAP_routeDiscovery(adjacencyMatrix, src, dst)

% BFS-based route discovery in a dynamic network

numNodes = size(adjacencyMatrix, 1);

visited = false(1, numNodes);

queue = [src];  % Start from the source node

parent = zeros(1, numNodes);  % To reconstruct the path

% Perform route discovery

while ~isempty(queue)

currentNode = queue(1);

queue(1) = [];  % Dequeue

if currentNode == dst

% Path found, reconstruct route

route = dst;

while parent(currentNode) ~= 0

route = [parent(currentNode), route];

currentNode = parent(currentNode);

end

return;

end

% Explore neighbors of the current node

neighbors = find(adjacencyMatrix(currentNode,:) < inf);

for neighbor = neighbors

if ~visited(neighbor)

visited(neighbor) = true;

parent(neighbor) = currentNode;

queue = [queue, neighbor];  % Enqueue neighbor

end

end

end

route = [];  % No route found

end

3. Route Maintenance in RAP

• Route maintenance is achieved when the network topology variations, for instance, because of node mobility or link failures. In RAP, nodes occasionally validate if their routes are still valid, and update them if required.

Example of route maintenance because of link failure:

function adjacencyMatrix = RAP_routeMaintenance(adjacencyMatrix, failedLink)

% Remove a failed link from the adjacency matrix

adjacencyMatrix(failedLink(1), failedLink(2)) = inf;

adjacencyMatrix(failedLink(2), failedLink(1)) = inf;

end

Mimic the network by establishing link failures over time and updating the adjacency matrix consequently:

failedLink = [1, 3];  % Example of a failed link between node 1 and node 3

adjacencyMatrix = RAP_routeMaintenance(adjacencyMatrix, failedLink);

4. Simulate Route Erasure

• When a route is no longer usable because of link failures or node mobility, the protocol begins to a Route Erasure process. This contains to eliminating the void route from the routing table and causing a new route discovery if required.

Example of route erasure:

function routingTable = RAP_routeErasure(routingTable, failedNode)

% Remove all routes that involve the failed node

for i = 1:length(routingTable)

if ismember(failedNode, routingTable{i})

routingTable{i} = [];  % Erase the route

end

end

end

5. Data Transmission Based on Route

• After discovering a route among origin and destination nodes, mimic data transmission via the network by transmitting the packets beside the introduced route.

Example of replicating data transmission using the discovered route:

function transmitData(adjacencyMatrix, src, dst)

% Discover the route using RAP_routeDiscovery

route = RAP_routeDiscovery(adjacencyMatrix, src, dst);

if isempty(route)

disp(‘No route found.’);

else

disp([‘Data transmitted from node ‘, num2str(src), ‘ to node ‘, num2str(dst), ‘ via route: ‘, num2str(route)]);

end

end

% Simulate data transmission from node 1 to node 7

srcNode = 1;

dstNode = 7;

transmitData(adjacencyMatrix, srcNode, dstNode);

6. Evaluate RAP Performance

• After replicating the route access protocol, measure key parameters like route discovery time, average path length, packet delivery ratio, and end-to-end delay.

Example of estimating the average path length:

totalPathLength = 0;

pathCount = 0;

for i = 1:numNodes

for j = i+1:numNodes

if i ~= j

route = RAP_routeDiscovery(adjacencyMatrix, i, j);

if ~isempty(route)

totalPathLength = totalPathLength + length(route);

pathCount = pathCount + 1;

end

end

end

end

avgPathLength = totalPathLength / pathCount;

disp([‘Average path length: ‘, num2str(avgPathLength)]);

7. Visualize the Network and Routes

• Utilize MATLAB’s plotting functions to envision the network topology, the nodes, and the routes taken in the course of communication.

Example of visualizing the network:

figure;

hold on;

plot(nodePositions(:,1), nodePositions(:,2), ‘bo’);  % Plot nodes

for i = 1:numNodes

for j = i+1:numNodes

if adjacencyMatrix(i,j) < inf

plot([nodePositions(i,1), nodePositions(j,1)], …

[nodePositions(i,2), nodePositions(j,2)], ‘r-‘);  % Plot links

end

end

end

title(‘Network Topology and Links’);

hold off;

Conclusion

To replicate a Route Access Protocol (RAP) in MATLAB:

1. Describe the network topology with nodes and links.
2. Apply route discovery using techniques such as BFS or DFS to identify a path among origin and destination nodes.
3. Execute route maintenance to manage link failures or node mobility.
4. Execute route erasure to eliminate void routes from the network.
5. Replicate data transmission using the discovered routes.
6. Measure the key metrics like route discovery time, path length, and packet delivery ratio.
7. Envision the network topology and routes for better tolerant of the protocol characteristics.

Using MATLAB, we performed a comprehensive route access protocol project analysis through given simulation process. We will also deliver further additional details about this protocol in another report work.

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