本文選題：信息物理融合系統(tǒng)　切入點(diǎn)：混合實(shí)時(shí)消息　出處：《南昌航空大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

【摘要】：實(shí)時(shí)系統(tǒng)主要面向與時(shí)間因素相關(guān)的應(yīng)用,其不僅要保障輸出的結(jié)果邏輯正確,還要保障輸出的結(jié)果及時(shí)、可靠。面向醫(yī)療的信息物理融合系統(tǒng)是實(shí)時(shí)系統(tǒng)的重要應(yīng)用之一,其通常包含多種不同類型的實(shí)時(shí)消息,按消息的實(shí)時(shí)性可以劃分為非實(shí)時(shí)消息、軟實(shí)時(shí)消息和硬實(shí)時(shí)消息。如何有效地調(diào)度實(shí)時(shí)系統(tǒng)中的非實(shí)時(shí)消息、軟實(shí)時(shí)消息和硬實(shí)時(shí)消息,是復(fù)雜實(shí)時(shí)系統(tǒng)得以廣泛應(yīng)用的關(guān)鍵性問(wèn)題之一。本文以面向醫(yī)療的信息物理融合系統(tǒng)為研究背景,以保障硬實(shí)時(shí)消息的有效調(diào)度、提高信道利用率和增強(qiáng)對(duì)網(wǎng)絡(luò)規(guī)模變化時(shí)的自適應(yīng)性為目標(biāo),對(duì)混合實(shí)時(shí)消息進(jìn)行調(diào)度算法研究。在無(wú)線網(wǎng)絡(luò)體系結(jié)構(gòu)中,媒介訪問(wèn)控制協(xié)議(Medium Access Control,MAC)位于網(wǎng)絡(luò)架構(gòu)的底層,負(fù)責(zé)為節(jié)點(diǎn)分配信道資源,控制著無(wú)線信道的使用方式與共享網(wǎng)絡(luò)媒體接入,決定著網(wǎng)絡(luò)時(shí)延、吞吐量、生存壽命等性能。本文在醫(yī)療信息物理融合系統(tǒng)應(yīng)用的基礎(chǔ)上,針對(duì)多種混合實(shí)時(shí)消息的應(yīng)用場(chǎng)景,在MAC層設(shè)計(jì)并實(shí)現(xiàn)一種混合實(shí)時(shí)消息的自適應(yīng)幀長(zhǎng)TDMA(Time Division Multiple Access,TDMA)算法。論文主要工作如下:第一,根據(jù)信息物理融合系統(tǒng)在醫(yī)療應(yīng)用上的特點(diǎn),特別是醫(yī)療監(jiān)控方面的應(yīng)用,闡述實(shí)時(shí)消息調(diào)度的重要性,并總結(jié)國(guó)內(nèi)外近幾年在無(wú)線網(wǎng)絡(luò)中實(shí)時(shí)消息調(diào)度算法的研究現(xiàn)狀。第二,對(duì)MAC協(xié)議和調(diào)度機(jī)制進(jìn)行分析,并提出一種針對(duì)混合實(shí)時(shí)消息的自適應(yīng)幀長(zhǎng)TDMA算法。該調(diào)度算法基于集中式網(wǎng)絡(luò)模型,對(duì)混合實(shí)時(shí)消息進(jìn)行分類調(diào)度,兼顧最早截止期優(yōu)先算法、單調(diào)速率算法和先進(jìn)先出算法的優(yōu)點(diǎn),同時(shí)結(jié)合網(wǎng)絡(luò)規(guī)�？勺兊那闆r,進(jìn)行自適應(yīng)幀長(zhǎng)調(diào)整。第三,在開(kāi)源的仿真平臺(tái)NS-2上對(duì)提出的混合實(shí)時(shí)消息自適應(yīng)幀長(zhǎng)TDMA算法進(jìn)行仿真實(shí)驗(yàn),從截止期限失去率、平均丟包率、端到端延時(shí)等性能進(jìn)行分析。仿真實(shí)驗(yàn)結(jié)果表明,提出的混合實(shí)時(shí)消息自適應(yīng)幀長(zhǎng)TDMA調(diào)度算法與靜態(tài)TDMA調(diào)度算法、動(dòng)態(tài)優(yōu)先級(jí)TDMA調(diào)度算法相比,該調(diào)度算法能夠在保證硬實(shí)時(shí)消息的前提下,提高信道利用率,降低平均端到端延時(shí)。
[Abstract]:The real-time system is mainly oriented to the application of time-related factors. It not only ensures the logical correctness of the output results, but also ensures the output results are timely and reliable. The medical information physics fusion system is one of the important applications of the real-time system. It usually contains many different types of real-time messages, which can be divided into non-real-time messages, soft real-time messages and hard real-time messages. Soft real time message and hard real time message are one of the key problems in the wide application of complex real time system. This paper takes the medical information physical fusion system as the research background to ensure the effective scheduling of hard real time message. In wireless network architecture, medium Access Control Protocol (MAC) is located at the bottom of the network architecture. It is responsible for allocating channel resources for nodes, controlling the use of wireless channels and access to shared network media, which determines the performance of network delay, throughput, lifetime, etc. This paper is based on the application of medical information physical fusion system. An adaptive frame length TDMA(Time Division Multiple access algorithm for hybrid real-time messages is designed and implemented in the MAC layer. The main work of this paper is as follows: first, according to the characteristics of the information physical fusion system in medical applications, we design and implement an adaptive frame length TDMA(Time Division Multiple access algorithm for hybrid real-time messages in the MAC layer. Especially in the application of medical monitoring, the importance of real-time message scheduling is expounded, and the research status of real-time message scheduling algorithm in wireless network in recent years is summarized. Secondly, the MAC protocol and scheduling mechanism are analyzed. An adaptive frame length TDMA algorithm for hybrid real-time messages is proposed, which is based on a centralized network model to classify and schedule hybrid real-time messages, taking into account the earliest deadline priority algorithm. The advantages of monotone rate algorithm and first-in first-out algorithm, combined with the variable network size, adaptive frame length adjustment. Third, The proposed hybrid real-time message adaptive frame length TDMA algorithm is simulated on the open source simulation platform NS-2. The performance of the proposed algorithm is analyzed in terms of deadline loss rate, average packet loss rate and end-to-end delay. Compared with static TDMA scheduling algorithm and dynamic priority TDMA scheduling algorithm, the proposed hybrid real-time message adaptive frame length TDMA scheduling algorithm can improve channel utilization under the premise of hard real-time messages. Reduce average end to end delay.
【學(xué)位授予單位】：南昌航空大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TP301.6

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