無線Mesh網(wǎng)絡中面向網(wǎng)絡編碼的調度機制研究
[Abstract]:Wireless Mesh networks consist of a group of mobile terminals with dynamic networking capabilities and no infrastructure support. Compared with Ad hoc networks, wireless Mesh networks have attracted much attention from industry and academia in recent years and become the last mile of commercialization due to their advantages of large capacity, high speed, low cost and good scalability. "Wireless broadband hot access technology. With the development of the Internet of Things and the increasing demand for wireless spectrum resources, wireless Mesh network is widely used in metropolitan area network wireless access, vehicle communications and intelligent terminals. With the advent of the era of large data network communications, wireless multimedia services are replacing traditional voice and data communications. Traffic has become the mainstream of network services. How to meet the increasing bandwidth requirements of users is an important issue that researchers need to consider. In addition, the existing research based on wireless Mesh network scheduling mostly assumes that the network channel state information can be known beforehand. However, the real-time changes of wireless network channel environment make it difficult to predict the channel state. Terminals will increasingly reflect people's social attributes, which poses a challenge to communication research in emerging social networks. In view of these problems and challenges, this paper proposes a scheduling mechanism based on channel gain and network coding, a scheduling mechanism based on network coding in Markov model, and a multi-radio frequency multi-channel multi-rate network coding. The main work and innovations of this paper are as follows: (1) Because of the real-time changes of wireless channel environment, channel state is difficult to predict. In chapter 2, wireless channel is proposed based on wireless channel. Gain and Network Coding Opportunity Scheduling and Power Allocation Schemes. Firstly, based on Analog Network Coding (ANC) and Time Division Broadcasting (TDBC) network model, a closed-form expression of outage probability with sliding sampling window is proposed to estimate the gain of wireless channel. The channel gain estimation strategy proposed in this chapter can adapt to the dynamic changes of the network, and has the advantages of simplicity and not limited by the network topology compared with the scheme based on the underlying information collection. Then, this chapter proposes an opportunity scheduling scheme based on the wireless channel gain, aiming to maximize the network transmission rate. The energy-aware power allocation schemes of nodes in ANC and TDBC schemes are studied with the aim of minimizing the total network transmission power. (2) In Chapter 3, a physical-layer network coding (PNC) oriented scheduling mechanism is proposed. The objective is to efficiently utilize wireless spectrum resources and improve network throughput. Relay channel transmission is a more complex form of network transmission, in which multiple nodes send information to the relay node at the same time and schedule links based on Markov chain. The state of Markov chain is the number of packets that the relay node can receive from the source node at the current time. The mechanism proposed in this chapter has more advantages in energy consumption in asymmetric channel state than in symmetric channel state. Because the channel state of most networks is asymmetric, this mechanism has a wide range of applications. (3) Although transmission technology convergence can greatly improve network performance, the research on how to deal with the interaction between different transmission technologies is just beginning. In order to maximize network throughput, Chapter 4 proposes a multi-radio frequency multi-channel multi-rate network coding sensing scheduling mechanism, which supports different relay transmission modes. In this chapter, we first propose a multi-rate network coding-aware scheduling scheme, which considers the interaction between network coding and space division multiplexing. Because of the high computational complexity of this problem, we solve this scheme based on the column generation algorithm, and propose a heuristic algorithm to simplify the sub-problem of column generation. Secondly, a virtual link fusion mechanism is proposed, which extends unicast transmission from the same source node to nodes with multiple ports without network coding to multicast transmission. In this chapter, a heuristic algorithm is used to solve the problem. (4) In order to schedule the individuals in the Internet of Things, Chapter 5 studies the scheduling mechanism for social networks and network coding. The scheme encourages the decomposition of long-distance single-hop communication links into multi-hop relay forwarding links, and reduces network transmission interference while creating more chances for link fusion and relay selection, thus improving the possibility of relay nodes adopting new transmission modes. Subsequently, this chapter establishes adaptive networks and network coding. Scheduling transmission mechanism aims to maximize social welfare and network throughput. Because of the high computational complexity of the optimization model, this chapter finally solves the problem by iteration algorithm based on bionic firefly algorithm. In order to verify and evaluate the performance of the mechanism, this paper uses C++ and Qualnet simulation software to build the simulation. Simulation results show that the proposed scheme and algorithm are effective and have better network performance than existing research schemes.
【學位授予單位】:東北大學
【學位級別】:博士
【學位授予年份】:2014
【分類號】:TN929.5
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