本文選題：機(jī)械類業(yè)務(wù)　切入點(diǎn)：隨機(jī)接入策略　出處：《北京郵電大學(xué)》2014年博士論文

【摘要】：無線接入技術(shù)的不斷更新,新的業(yè)務(wù)不斷涌現(xiàn),促使無線通信系統(tǒng)飛速發(fā)展�？傮w來說,其發(fā)展蘊(yùn)含了單系統(tǒng)演進(jìn)和多系統(tǒng)融合。單系統(tǒng)演進(jìn)包含無線通信系統(tǒng)的平滑過渡或者革新,多系統(tǒng)融合則是網(wǎng)絡(luò)異構(gòu)化。無論是單系統(tǒng)演進(jìn)還是多系統(tǒng)融合,無線資源管理都在其中扮演著重要角色,用戶接入是無線通信系統(tǒng)中實(shí)現(xiàn)無線資源管理的基礎(chǔ),良好的隨機(jī)接入控制策略則是實(shí)現(xiàn)用戶成功接入的保障。 本文從隨機(jī)接入的角度出發(fā),針對單體制系統(tǒng),重點(diǎn)考慮OFDMA系統(tǒng),針對多系統(tǒng),重點(diǎn)考慮異構(gòu)融合系統(tǒng)。首先簡單分析介紹了這兩種系統(tǒng),并進(jìn)一步研究了這兩種系統(tǒng)下隨機(jī)接入控制策略的研究現(xiàn)狀,然后介紹了部分常用算法,最后分別針對OFDMA系統(tǒng)、異構(gòu)系統(tǒng)以及Machine-to-Machine (M2M)業(yè)務(wù)提出了結(jié)合各自特征的隨機(jī)接入控制策略,本文的主要內(nèi)容及貢獻(xiàn)包括： 針對OFDMA系統(tǒng),分別提出了一種基于偽貝葉斯算法的接入策略和退避策略,這兩種策略充分考慮OFDMA系統(tǒng)的特點(diǎn)并基于TDD模式提出。接入策略包含自適應(yīng)分配隨機(jī)接入信道資源策略和自適應(yīng)接入概率值策略兩部分。自適應(yīng)分配策略根據(jù)系統(tǒng)的負(fù)載狀態(tài)動態(tài)配置隨機(jī)接入信道的數(shù)目,自適應(yīng)接入概率策略則基于自適應(yīng)分配隨機(jī)接入信道資源策略的結(jié)果來調(diào)整終端用戶接入概率大小,從而提高終端用戶接入成功率。退避策略同樣是根據(jù)系統(tǒng)的負(fù)載狀態(tài),采用快速接入與動態(tài)退避相結(jié)合的機(jī)制,通過預(yù)估的終端用戶數(shù)目與隨機(jī)接入信道數(shù)目相比,從而選擇出合適的退避策略以及相應(yīng)的退避時間,有效的降低了終端用戶的平均時延。 針對M2M業(yè)務(wù)提出了一種異構(gòu)環(huán)境下的分流接入控制策略。本策略突破單一網(wǎng)絡(luò)的傳輸能力限制,結(jié)合M2M業(yè)務(wù)海量、群組化等業(yè)務(wù)特征,將M2M業(yè)務(wù)分為多個業(yè)務(wù)子流在不同網(wǎng)絡(luò)中傳輸。在場景建模上,首先設(shè)置接入點(diǎn),由接入點(diǎn)承擔(dān)著M2M業(yè)務(wù)的匯聚以及接入多個網(wǎng)絡(luò)的功能。同時引入經(jīng)濟(jì)學(xué)概念,考慮收益和成本兩個方面,然后利用排隊(duì)論模型進(jìn)行分析,建立效用函數(shù)模型。并將此模型化為具有等式和不等式約束的非線性規(guī)劃問題,采用拉格朗日常數(shù)法和KKT法進(jìn)行問題求解,所得結(jié)果即為不同網(wǎng)絡(luò)的分流結(jié)果,并證明了結(jié)果全局最優(yōu)。該策略充分考慮了M2M業(yè)務(wù)特點(diǎn),使得分配結(jié)果效用最大化。 針對異構(gòu)環(huán)境下多終端多網(wǎng)絡(luò)場景,提出了一種基于負(fù)載平衡的隨機(jī)接入策略,該策略由接入選擇機(jī)制和接入控制機(jī)制兩個方面構(gòu)成,接入選擇機(jī)制主要主要解決用戶“如何選擇網(wǎng)絡(luò)”的問題,它將終端用戶所關(guān)心的多個屬性化為空間中的一個維度后,同時采用改進(jìn)的AHP方法減少主觀影響,得到目標(biāo)向量和實(shí)際向量,通過向量間的幾何關(guān)系得到用戶的可選網(wǎng)絡(luò)集。接入控制機(jī)制則解決“用戶接入到哪個網(wǎng)絡(luò)”的問題,網(wǎng)絡(luò)側(cè)根據(jù)終端用戶由接入選擇機(jī)制選出的可接入網(wǎng)絡(luò)集后,基于負(fù)載平衡的原理,將終端用戶分配到合適的網(wǎng)絡(luò)中。該機(jī)制充分考慮了終端側(cè)和網(wǎng)絡(luò)側(cè)的利益,即提高終端用戶的QoS,又讓網(wǎng)絡(luò)在負(fù)載平衡的基礎(chǔ)上盡可能讓更多的用戶接入。
[Abstract]:Wireless access technology is constantly updated, new business are constantly emerging, promote the rapid development of wireless communication system. In general, its development contains a single system and multi system integration evolution. Single system evolution of the wireless communication system includes a smooth transition or innovation, multi system integration is the network isomerization. Either single or multi system evolution system fusion, wireless resource management will play a key role in the implementation of user access, is the foundation of radio resource management in wireless communication system, a good random access control strategy is to achieve successful user access security.
This article from the random access point, for a single system, focus on the OFDMA system for multi system, focus on the integration of heterogeneous system. Firstly introduces the simple analysis of the two systems, and further study the research status of the random access control strategy of the two systems, and then introduces some commonly used algorithms, finally, respectively. According to the OFDMA system, heterogeneous system and Machine-to-Machine (M2M) business proposed random access control strategy according to their own characteristics, the main contents and contributions of this paper include:
According to the OFDMA system, propose an access strategy of the pseudo Bayesian algorithm and backoff strategy based on these two strategies fully consider the characteristics of the OFDMA system is proposed based on TDD model. The access strategy includes adaptive random access channel resource allocation strategy and adaptive access probability values of two part strategy. Adaptive allocation strategy according to the number of dynamic configuration random access channel load system, adaptive access probability strategy adaptive allocation random access channel resource strategy based on the results of the adjustment of the terminal user access probability, so as to improve the success rate of terminal user access. The same backoff strategy according to the load of the system, the mechanism of using fast access and dynamic backoff combination, the number of terminal the user estimates compared with the number of random access channel, so as to select the appropriate backoff strategy and the corresponding The backoff time effectively reduces the average delay of the end user.
For the M2M business a shunt access in heterogeneous environment. The proposed control strategy to limit the transmission capacity of the network's breakthrough single strategy, combined with the M2M business group of massive, business characteristics, M2M business is divided into a plurality of sub stream transmission business in different networks. In scene modeling, first set the access point by the access point undertakes M2M service convergence and access network function. While introducing the concept of economics, consider two aspects of income and cost, and then use the queuing theory model analysis, establishes the utility function model. And this model into a nonlinear programming problem with equality and inequality constraints, the Lagrange constant and KKT method is used to solve the problem, the result is the dividing results of different networks, and prove the global optimal results. This strategy takes full account of the characteristics of M2M services, the allocation results of utility maximization .
Aiming at the heterogeneous environment of multi terminal network scenarios, proposed a load balance based on random access strategy, the two aspects of the strategy by the access selection mechanism and access control mechanism, access selection mechanism mainly to solve the user how to choose network ", multiple attributes it will concern for end users a dimension in the space, at the same time using improved AHP method to reduce the subjective effect, get the target vector and the actual vector, get optional network users set through the geometric relationship between vectors. The access control mechanism is to solve the" user access to which network ", according to the user selected by the network side terminal access selection mechanism to access the network in principle, based on load balancing, the terminal user is assigned to the appropriate network. This mechanism takes full account of the terminal side and network side interests, namely The QoS of high end users allows the network to allow more users to access as much as possible on the basis of load balance.

【學(xué)位授予單位】：北京郵電大學(xué)
【學(xué)位級別】：博士
【學(xué)位授予年份】：2014
【分類號】：TN925.93

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