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首頁> 外文OA文獻(xiàn) >Modelling and Analysis of Resource Management Schemes in Wireless Networks. Analytical Models and Performance Evaluation of Handoff Schemes and Resource Re-Allocation in Homogeneous and Heterogeneous Wireless Cellular Networks.
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Modelling and Analysis of Resource Management Schemes in Wireless Networks. Analytical Models and Performance Evaluation of Handoff Schemes and Resource Re-Allocation in Homogeneous and Heterogeneous Wireless Cellular Networks.

機(jī)譯：無線網(wǎng)絡(luò)中資源管理方案的建模和分析。異構(gòu)和異構(gòu)無線蜂窩網(wǎng)絡(luò)中切換方案和資源重新分配的分析模型和性能評(píng)估。

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摘要

Over recent years, wireless communication systems have been experiencing a dramatic and continuous growth in the number of subscribers, thus placing extra demands on system capacity. At the same time, keeping Quality of Service (QoS) at an acceptable level is a critical concern and a challenge to the wireless network designer. In this sense, performance analysis must be the first step in designing or improving a network. Thus, powerful mathematical tools for analysing most of the performance metrics in the network are required. A good modelling and analysis of the wireless cellular networks will lead to a high level of QoS.udIn this thesis, different analytical models of various handoff schemes and resource re-allocation in homogeneous and heterogeneous wireless cellular networks are developed and investigated. The sustained increase in users and the request for advanced services are some of the key motivations for considering the designing of Hierarchical Cellular Networks (HCN). In this type of system, calls can be blocked in a microcell flow over to an overlay macrocell. Microcells in the HCN can be replaced by WLANs as this can provide high bandwidth and its users have limited mobility features. Efficient sharing of resources between wireless cellular networks and WLANs will improve the capacity as well as QoS metrics.udThis thesis first presents an analytical model for priority handoff mechanisms, where new calls and handoff calls are captured by two different traffic arrival processes, respectively. Using this analytical model, the optimised number of channels assigned toudIIudhandover calls, with the aim of minimising the drop probability under given network scenarios, has been investigated. Also, an analytical model of a network containing two cells has been developed to measure the different performance parameters for each of the cells in the network, as well as altogether as one network system. Secondly, a new solution is proposed to manage the bandwidth and re-allocate it in a proper way to maintain the QoS for all types of calls. Thirdly, performance models for microcells and macrocells in hierarchical cellular networks have been developed by using a combination of different handoff schemes. Finally, the microcell in HCN is replaced by WLANs and a prioritised vertical handoff scheme in an integrated UMTS/WLAN network has been developed. Simulation experiments have been conducted to validate the accuracy of these analytical models. The models have then been used to investigate the performance of the networks under different scenarios.
機(jī)譯：近年來，無線通信系統(tǒng)的訂戶數(shù)量一直在急劇增長(zhǎng)，因此對(duì)系統(tǒng)容量提出了額外的要求。同時(shí)，將服務(wù)質(zhì)量（QoS）保持在可接受的水平是無線網(wǎng)絡(luò)設(shè)計(jì)人員的一個(gè)緊要關(guān)頭和挑戰(zhàn)。從這個(gè)意義上講，性能分析必須是設(shè)計(jì)或改進(jìn)網(wǎng)絡(luò)的第一步。因此，需要用于分析網(wǎng)絡(luò)中大多數(shù)性能指標(biāo)的強(qiáng)大數(shù)學(xué)工具。對(duì)無線蜂窩網(wǎng)絡(luò)進(jìn)行良好的建模和分析將導(dǎo)致較高的QoS。 ud本文針對(duì)同質(zhì)和異構(gòu)無線蜂窩網(wǎng)絡(luò)中各種切換方案和資源重新分配的不同分析模型進(jìn)行了開發(fā)和研究。用戶的持續(xù)增長(zhǎng)和對(duì)高級(jí)服務(wù)的需求是考慮分層蜂窩網(wǎng)絡(luò)（HCN）設(shè)計(jì)的一些主要?jiǎng)訖C(jī)。在這種類型的系統(tǒng)中，可以在微蜂窩流中將呼叫阻塞到覆蓋宏蜂窩。 HCN中的微蜂窩可以被WLAN取代，因?yàn)樗梢蕴峁└邘?，并且用戶的移?dòng)性有限。無線蜂窩網(wǎng)絡(luò)和WLAN之間的資源有效共享將提高容量和QoS指標(biāo)。 ud本文首先介紹了優(yōu)先級(jí)切換機(jī)制的分析模型，其中，新呼叫和切換呼叫分別由兩個(gè)不同的流量到達(dá)過程捕獲。使用此分析模型，已經(jīng)研究了分配給 udII udhandover呼叫的最佳信道數(shù)，目的是在給定的網(wǎng)絡(luò)情況下將丟失概率降至最低。另外，已經(jīng)開發(fā)了包含兩個(gè)小區(qū)的網(wǎng)絡(luò)的分析模型，以測(cè)量網(wǎng)絡(luò)中每個(gè)小區(qū)以及作為一個(gè)網(wǎng)絡(luò)系統(tǒng)的每個(gè)小區(qū)的不同性能參數(shù)。其次，提出了一種新的解決方案來管理帶寬并以適當(dāng)?shù)姆绞綄?duì)其進(jìn)行重新分配，以維持所有類型呼叫的QoS。第三，通過使用不同的切換方案的組合，已經(jīng)開發(fā)了用于分級(jí)蜂窩網(wǎng)絡(luò)中的微蜂窩和宏蜂窩的性能模型。最終，HCN中的微蜂窩被WLAN取代，并且已經(jīng)開發(fā)了集成UMTS / WLAN網(wǎng)絡(luò)中優(yōu)先的垂直切換方案。已經(jīng)進(jìn)行了仿真實(shí)驗(yàn)以驗(yàn)證這些分析模型的準(zhǔn)確性。然后將這些模型用于調(diào)查不同情況下網(wǎng)絡(luò)的性能。

著錄項(xiàng)

  • 作者

    Zabanoot Zaid Ahmed Said;

  • 作者單位
  • 年度 2011
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