Throughput-optimal Configuration of Fixed Wireless Mesh Network in Cross-way Design

A network is defined by a collection of nodes clients, server, and links (routers) between pairs of client and server.The client edge router sends the test message to all the available routes to get the best path from the list of all possible paths based on the transmission delay time. choose an offline route selection algorithm i.e to select multi path routing algorithm.Data packets are forwarded through the minimum delay router along with next minimum delay priority router from the client to server.Current Network architecture developed for wired networks is not efficient for multihop wireless networks.Transfer the packet from Source to destination by using shortest path algorithm .this algorithm to find the shortest path between Source and Destination and then Transfer the Packet depends upon TTL Value of packet. using Single channel transmission to transfer data so reduce the network speed,Data loss and delay time found to be high while using Single channel and shortest path algorithm. The client edge router sends the test message to all the available routes to get the best path from the list of all possible paths based on the transmission delay time.By using Joint-Routing algorithm, Transfer the packets to all beat selected path Channel so that data transmission will improve the throughput of the network. In Multi-channel wireless network, data will be transferred within the TTL in router. INTRODUCTION Although the worldwide success of the Internet is partly due to the simplicity and robustness of its layered network architecture, this architecture, developed for wired networks, is not efficient for multihop wireless networks. Cross-layer approaches have been proposed , to enhance the adaptability and performance of these networks by jointly tuning the parameters of different layers. One of the critical performance metrics in multihop wireless networks is throughput. It is highly dependent on the configuration of routing, medium access, and physical-layer parameter and on their interactions; see, for example, and in the case of a (conflict-free) scheduled network. Configuring a wireless network based on random access is much more difficult, and one might be tempted to simply use a so-called default configuration comprised, for example in the case of slotted ALOHA, of a minimum-hop routing and equal attempt probability. While one would expect that joint configuration of routing, medium access, and physical-layer parameters of a random access network can provide better performance than the default configuration, there is no clear indication so far on how much improvement can be achieved by joint design and how to jointly configure the parameters. In a single-channel wireless network, during a transmission, the interference seen by a receiver is the additive interference from all the other simultaneous transmissions. As a consequence, it is essential to use a proper interference model when configuring the wireless network. The physical interference model based on signal-to-interferenceplus-noise ratio (SINR) is the more realistic interference model for wireless network. cross-layer design in random-access-based fixed wireless multihop networks under a physical interference model. Due to the complexity of the problem, consider a simple slotted ALOHA medium access control (MAC) protocol for link-layer operation. Formulate a joint routing, access probability, and rate allocation optimization problem to determine the optimal max-min throughput of the flows and the optimal configuration of the routing, access probability, and transmission rate parameters in a slotted ALOHA system and also adapt this problem to include an XOR-like network coding without opportunistic listening. Both problems are complex nonlinear and non convex .To provide extensive numerical results for both problems for medium-size mesh networks using an iterated optimal search technique via numerical and simulation results.Joint design provides a significant throughput gain over a default configuration in slotted-ALOHA-based wireless networks. The throughput gain obtained by the simple network coding is significant, especially at low transmission power. Propose simple heuristics to configure slotted-ALOHA-based wireless mesh International Journal On Engineering Technology and Sciences – IJETSTM ISSN (P): 2349-3968, ISSN (O): 2349-3976 Volume 2 Issue 3, March 2015 9 networks. These heuristics are extensively evaluated via simulation and found to be very efficient. Keyword— joint routing design, medium access protocol(MAC), slotted ALOHA. CROSS-LAYER APPROACHES cross layer approaches which attempt to exploit a richer interaction among communication layers to achieve performance gains have emerged. Cross-layer interactions offer the possibility of dealing with the special properties of Wireless Sensor Network that cannot be handled well by layered architectures. For example, this can be handling the variations in link quality or adjusting the radio strength, which influences the transmission range, the number of collisions, and energy consumption. These parameters can further be used as routing metrics at Network Layer for efficient routing. Slotted ALOHA Aloha, also called the Aloha method, refers to a simple communications scheme in which each source (transmitter) in a network sends data whenever there is a frame to send. If the frame successfully reaches the destination (receiver), the next frame is sent. If the frame fails to be received at the destination, it is sent again. Slotted ALOHA was invented to improve the efficiency of pure ALOHA as chances of collision in pure ALOHA are very high. In slotted ALOHA, the time of the shared channel is divided into discrete intervals called slots. The stations can send a frame only at the beginning of the slot and only one frame is sent in each slot Routing over Multihop Wireless Network Multi-hop or ad hoc, wireless networks use two or more wireless hops to convey information from a source to a destination. There are two distinct applications of multi-hop communication, with common features, but different applications. Mobile ad hoc networks (MANETS) a mobile ad hoc network consists of a group of mobile nodes that communicate without requiring a fixed wireless infrastructure. Figure 1(a) Cross-Layer Approaches one of the critical performance metrics in multihop wireless networks is throughput. It is highly dependent on the configuration of routing, medium access, and physical-layer parameters and on their interactions; see, for example, and in the case of a (conflict-free) scheduled network. Configuring a wireless network based on random access is much more difficult, and one might be tempted to simply use a so-called default configuration comprised, for example in the case of slotted ALOHA, of a minimum-hop routing and equal attempt probability While one would expect that joint configuration of routing, medium access, and physical-layer parameters of a random access network can provide better performance than the default configuration, there is no clear indication so far on how much improvement can be achieved by joint design and how to jointly configure the parameters. Figure 1(b) Multihop Wireless Networks International Journal On Engineering Technology and Sciences – IJETSTM ISSN (P): 2349-3968, ISSN (O): 2349-3976 Volume 2 Issue 3, March 2015