英国Essay代写论文精选:“无线多宿主网络与NS2的应用方法(2)”,这篇论文主要介绍了无线通信和移动技术多接口架构的相关知识。论文为读者介绍了提高无线技术有效利用率的方法,让读者充分认识到了无线技术的强大及发展。
Simulation Analysis NS2 is the famous tool to simulating wireless sensor network. This may help a lot for research community to verify their result and to make sure that their path is correct or not. At late 1990 the wireless and ad-hoc network simulation was extended in NS2 by CMU Monach [7] group. The main purpose of this extension is to test the simulation especially for wireless sensor network and the Ad-Hoc network. This document and the scenario were mainly based on CMU-Monach Group developed NS2 simulation. There was another Multi-homing [4] facility included in NS2. This is called as (SCTP) Stream Control Transmission Protocol. SCTP was developed by University of Delaware. But practically the SCTP was not giving a full satisfaction to the research workers. The main reason for this failure is; this is mainly considered and implemented only about two end points in the network. This did not support for interconnection heterogeneous network. Our focus is mainly on this part and creates a simple scenario in NS2 by using AODV protocol. The second argument is on the SCTP implementation in the Multihoming Network, it is not an independent protocol. When it is functioning all the time it requests to use some other protocols. Example: Other Transport layer protocols. The last argument is the support of the SCTP [5] is very poor in the Moblie Adhoc Network. Especially in the sensor network, where the transport verification is not so important, UDP need to be used instead of TCP for the power consumption. But SCTP is not functioning like that. Because of all these reasons I have ignored the Steam Control transmission Protocol (SCTP) and implemented scenarios for Multihoming network by using CMU Monach group NS2 and the concepts. Basically the below idea is used in my arguments. There are four nodes using for this implementation. Node1 and the Node2 in one network channel and Node3 and Node4 in another network channel. The packets can't send from Node1 to Node4. Because the Node1, Node2 in one channel or the network and Node2, Node3 in another channel or the network. Once the packets want to send the data from Node1 to Node4 the Node 2 and Node 3 should be configured as a bridge between these two network channels. Further more details check the figure 01 below. Channel 1 Channel2 A.Simulation codes and set up analyisis Implemented AODV protocol in define option instead of SCTP protocol. set val(rp) AODV ;# routing protocol In NS2 : Phy/WirelessPhy set Pt ;#is for sender side, Phy/WirelessPhy set RXThresh ;#is for receiver side Below the commands use to be set the parameters make the transmission range 250m for two-ray ground signal propagation model. Phy/WirelessPhy set RXThresh_ 3.65262e-10 Phy/WirelessPhy set Pt_ 0.281838 Phy/WirelessPhy set freq_ 914e+6 Create God. set god_ [create-god val(nn)] god_ off god_ allow_to_stop god_ num_data_types 1 Configure phenomenon channel and data channel set chan_0_ [new val(chan)] set chan_1_ [new val(chan)] set chan_2_ [new val(chan)] The below command use to configure Node1 and Node2 in channel-1. ns_ node-config \ -channel chan_1_ set node_(1) [ns_ node] node_(1) random-motion 0 ;# disable it(random-motion) god_ new_node node_(1) node_(1) set X_ 40 node_(1) set Y_ 50 set node_(2) [ns_ node] node_(2) random-motion 0;# disable it. god_ new_node node_(2) node_(2) set X_ 50 node_(2) set Y_ 50 As same as above command, the commands below use to configure Node3 and Node4 in channel-2 ns_ node-config \ -channel chan_2_ set node_(3) [ns_ node] node_(3) random-motion 0 ;# disable it. god_ new_node node_(3) node_(3) set X_ 50 node_(3) set Y_ 50 set node_(4) [ns_ node] node_(4) r andom-motion 0 ;# disable it. god_ new_node node_(4) node_(4) set X_ 60 node_(4) set Y_ 50 Configure Node2 and Node3 into one Multihoming node [node_(2) set ll_(0)] peer-target [node_(3) entry] [node_(2) set ll_(0)] peer-node node_(3) [node_(3) set ll_(0)] peer-target [node_(2) entry] [node_(3) set ll_(0)] peer-node node_(2) Set UDP layers for the nodes, and attach Multihoming set agent_(i) [new Agent/UDP] Then the commands implemented to create the communication from Node-1 to Node-4 in different network channel. set app_(1) [new Application/MultihomingApp] app_(1) attach-multiagent 0 agent_(1) app_(1) dst_agent agent_(4) Likewise the codes implemented to communicate from Node4 to Node1. set app_(2) [new Application/MultihomingApp] app_(2) attach-multiagent 0 agent_(4) app_(2) dst_agent agent_(1) Node2 and Node3 attached to the same Application. set app_core [new Application/MultihomingApp] app_core attach-multiagent 0 agent_(2) app_core attach-multiagent 1 agent_(3) To check the application scenario, just send 100byets frm Node1 to Node4. ns_ at 1.0 'app_(1) unicast agent_(1) 200' Setout Multihomed broad cast size to 100 ns_ at 10.0 'app_core broadcast 100' ns_ at 15.0 'app_(2) unicast agent_(4) 20' B. Someadditional support Very important thing is when you test before this above NS2 simulation codes or the .tcl file, assure the software NS2-MIUN installed with the at least version of NS2-2.29. The abbreviation “i.e” means “that is” and “e.g” means “examples” and “ect” means extra. The name call “data” is plural not singular. Conclusions Multi-home network is really useful for enhance the secure and reliable packet transmission among nodes. By this implementation, it can be more recognize for interconnecting of different transmission nodes in different network channels. This may more useful for heterogeneous and Ad-hoc networks. The wireless Multi-home network already implemented by using SCTP protocol. But Particle wise SCTP protocol is not suite for Multi-Home network. But this papers support you to do the simulation of Multi-home Network by using AODV protocol in NS2. At the same time able to use this method in practically. 51Due作为专业的留学教育辅导机构,专业辅导essay代写-伯明翰assignment代写-paper代写-曼彻斯特论文代写,自2004年至今,坚持以学生为中心,全天候服务,为海外留学生完成了数万篇以上的论文,以优质的英国代写服务赢得留学生的信赖,有代写需求或者剑桥essay辅导、爱丁堡essay辅导需求的,可以咨询51Due哦。
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