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  本文選題：信息物理融合系統(tǒng)　切入點：混合實時消息　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】：實時系統(tǒng)主要面向與時間因素相關(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、可靠。面向醫(yī)療的信息物理融合系統(tǒng)是實時系統(tǒng)的重要應(yīng)用之一,其通常包含多種不同類型的實時消息,按消息的實時性可以劃分為非實時消息、軟實時消息和硬實時消息。如何有效地調(diào)度實時系統(tǒng)中的非實時消息、軟實時消息和硬實時消息,是復(fù)雜實時系統(tǒng)得以廣泛應(yīng)用的關(guān)鍵性問題之一。本文以面向醫(yī)療的信息物理融合系統(tǒng)為研究背景,以保障硬實時消息的有效調(diào)度、提高信道利用率和增強對網(wǎng)絡(luò)規(guī)模變化時的自適應(yīng)性為目標(biāo),對混合實時消息進行調(diào)度算法研究。在無線網(wǎng)絡(luò)體系結(jié)構(gòu)中,媒介訪問控制協(xié)議(Medium Access Control,MAC)位于網(wǎng)絡(luò)架構(gòu)的底層,負責(zé)為節(jié)點分配信道資源,控制著無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,針對多種混合實時消息的應(yīng)用場景,在MAC層設(shè)計并實現(xiàn)一種混合實時消息的自適應(yīng)幀長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,特別是醫(yī)療監(jiān)控方面的應(yīng)用,闡述實時消息調(diào)度的重要性,并總結(jié)國內(nèi)外近幾年在無線網(wǎng)絡(luò)中實時消息調(diào)度算法的研究現(xiàn)狀。第二,對MAC協(xié)議和調(diào)度機制進行分析,并提出一種針對混合實時消息的自適應(yīng)幀長TDMA算法。該調(diào)度算法基于集中式網(wǎng)絡(luò)模型,對混合實時消息進行分類調(diào)度,兼顧最早截止期優(yōu)先算法、單調(diào)速率算法和先進先出算法的優(yōu)點,同時結(jié)合網(wǎng)絡(luò)規(guī)�？勺兊那闆r,進行自適應(yīng)幀長調(diào)整。第三,在開源的仿真平臺NS-2上對提出的混合實時消息自適應(yīng)幀長TDMA算法進行仿真實驗,從截止期限失去率、平均丟包率、端到端延時等性能進行分析。仿真實驗結(jié)果表明,提出的混合實時消息自適應(yīng)幀長TDMA調(diào)度算法與靜態(tài)TDMA調(diào)度算法、動態(tài)優(yōu)先級TDMA調(diào)度算法相比,該調(diào)度算法能夠在保證硬實時消息的前提下,提高信道利用率,降低平均端到端延時。
[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)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TP301.6

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本文編號：1617117