本文關(guān)鍵詞：異構(gòu)無線網(wǎng)絡(luò)中的選擇策略研究　出處：《西安電子科技大學(xué)》2014年博士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 異構(gòu)無線網(wǎng)絡(luò) 網(wǎng)絡(luò)選擇策略 有效容量 時延限制 功率控制 資源預(yù)測 小區(qū)間干擾

【摘要】：隨著移動通信技術(shù)的不斷發(fā)展，適應(yīng)不同場景的異構(gòu)無線網(wǎng)絡(luò)可以為用戶提供高質(zhì)量的服務(wù)，滿足用戶寬帶接入和無縫移動性的需求，移動終端如何選擇合適的網(wǎng)絡(luò)進(jìn)行接入，成為異構(gòu)無線網(wǎng)絡(luò)需要解決的主要問題。在移動通信系統(tǒng)中，影響用戶服務(wù)質(zhì)量和網(wǎng)絡(luò)性能的因素主要包括小區(qū)覆蓋范圍、接收信號強度、時延、帶寬、信噪比等，本文對異構(gòu)無線網(wǎng)絡(luò)選擇策略進(jìn)行較為深入的研究，為用戶提供滿足其不同需求的網(wǎng)絡(luò)，具體內(nèi)容如下： 1.針對異構(gòu)無線網(wǎng)絡(luò)中帶寬資源受限的問題，提出了一種基于帶寬資源分配的網(wǎng)絡(luò)選擇策略，以帶寬受限情況下最大化整體網(wǎng)絡(luò)的信息傳輸速率和帶寬利用率為目標(biāo)，將用戶的信息傳輸速率作為目標(biāo)函數(shù)，帶寬資源限制作為約束條件，得到最佳的帶寬分配策略，將用戶分配到最合適的網(wǎng)絡(luò)中。理論分析和仿真實驗表明基于帶寬資源分配的網(wǎng)絡(luò)選擇策略可以獲得較高的網(wǎng)絡(luò)吞吐量和資源利用率。 2.將網(wǎng)絡(luò)時延限制和瞬時傳輸速率相結(jié)合，提出了基于有效容量的網(wǎng)絡(luò)選擇策略。在實際系統(tǒng)中，不同的業(yè)務(wù)具有不同的時延要求，但是傳統(tǒng)的香農(nóng)容量定理并沒有考慮網(wǎng)絡(luò)和業(yè)務(wù)的時延特性，因此本文利用有效容量的概念，通過功率控制準(zhǔn)則，將網(wǎng)絡(luò)時延特性引入到傳輸速率中，以基于有效容量和時延特性的傳輸速率作為目標(biāo)函數(shù)，以功率控制準(zhǔn)則作為約束條件，采用凸優(yōu)化理論得到最大化的信息傳輸速率。然后構(gòu)建一個效用函數(shù)，綜合考慮瞬時信道傳輸速率和用戶開銷對用戶性能的影響。最后用戶通過比較接入不同網(wǎng)絡(luò)的效用函數(shù)，選擇具有最高效用函數(shù)的網(wǎng)絡(luò)進(jìn)行接入。理論分析和仿真實驗表明基于有效容量的網(wǎng)絡(luò)選擇策略可以在保證用戶服務(wù)質(zhì)量的前提下提高網(wǎng)絡(luò)的吞吐量。 3.將網(wǎng)絡(luò)因素和基于有效容量的瞬時信道傳輸速率相結(jié)合，提出了聯(lián)合的網(wǎng)絡(luò)選擇策略。我們將聯(lián)合網(wǎng)絡(luò)選擇策略分為兩種情況分別討論。 在第一種情況中，針對異構(gòu)無線網(wǎng)絡(luò)不同業(yè)務(wù)的時延限制和網(wǎng)絡(luò)資源不確定性的問題，提出了一種聯(lián)合時延限制和資源預(yù)測的網(wǎng)絡(luò)選擇策略。首先預(yù)測下一時隙信道資源的空閑概率和占用概率，然后以基于有效容量的信息傳輸速率作為目標(biāo)函數(shù)，，以用戶的功率控制作為約束條件，在保障用戶服務(wù)質(zhì)量的前提下，采用凸優(yōu)化理論得到最大化的網(wǎng)絡(luò)傳輸速率，最后用戶根據(jù)預(yù)測結(jié)果和傳輸速率兩方面因素，選擇具有充足帶寬資源和最大傳輸速率的網(wǎng)絡(luò)進(jìn)行接入。仿真實驗表明，在不同信道衰落條件下，聯(lián)合時延限制和資源預(yù)測的網(wǎng)絡(luò)選擇策略與注水策略相比，傳輸速率高于注水策略，并且更接近已知網(wǎng)絡(luò)資源空閑情況的速率上界。 在第二種情況中，針對異構(gòu)無線網(wǎng)絡(luò)不同業(yè)務(wù)的時延限制和小區(qū)間干擾的問題，提出了一種基于小區(qū)間干擾和時延特性的網(wǎng)絡(luò)選擇策略。首先通過功率控制準(zhǔn)則，得出基于網(wǎng)絡(luò)時延限制和接收信號強度限制的用戶傳輸功率和接收到的干擾功率，計算用戶接入網(wǎng)絡(luò)的信號和干擾加噪聲比(SINR)。然后通過比較接入不同網(wǎng)絡(luò)的SINR，選擇具有最高SINR的網(wǎng)絡(luò)進(jìn)行接入。理論分析和仿真實驗表明，隨著網(wǎng)絡(luò)時延限制條件的變化，本文提出的基于小區(qū)間干擾的聯(lián)合網(wǎng)絡(luò)選擇策略可以獲得較高的網(wǎng)絡(luò)吞吐量和用戶平均SINR。 4.針對異構(gòu)無線網(wǎng)絡(luò)中用戶具有自私性的問題，提出了一種基于拍賣理論的網(wǎng)絡(luò)選擇策略。首先采用單目標(biāo)第二價格拍賣理論分析切換式網(wǎng)絡(luò)選擇策略，在切換式網(wǎng)絡(luò)選擇策略中，用戶同一時間只能接入一個網(wǎng)絡(luò)，用戶根據(jù)質(zhì)量函數(shù)和干擾質(zhì)量函數(shù)對網(wǎng)絡(luò)資源進(jìn)行出價，網(wǎng)絡(luò)將資源分配給出價最高的用戶，因此可以保證較高的網(wǎng)絡(luò)吞吐量。其次采用多目標(biāo)擴展Vickrey拍賣理論分析并行式網(wǎng)絡(luò)選擇策略，在并行式網(wǎng)絡(luò)選擇策略中，用戶可以同時接入多個網(wǎng)絡(luò)，贏得多個網(wǎng)絡(luò)資源的用戶可以接入多個網(wǎng)絡(luò)進(jìn)行服務(wù)，從而提升了網(wǎng)絡(luò)性能。理論分析和仿真實驗表明，與其他網(wǎng)絡(luò)選擇策略相比，基于拍賣的網(wǎng)絡(luò)選擇策略不僅可以提升網(wǎng)絡(luò)吞吐量，而且可以降低網(wǎng)絡(luò)的中斷概率。
[Abstract]:With the development of mobile communication technology , the heterogeneous wireless network adapted to different scenarios can provide high - quality service for users , meet the needs of user ' s broadband access and seamless mobility , how to select the appropriate network for access by the mobile terminal , and become the main problem that the heterogeneous wireless network needs to solve . In the mobile communication system , the factors that affect the quality of service and network performance of the user include cell coverage , received signal strength , time delay , bandwidth , signal - to - noise ratio , etc . In the mobile communication system , the network with different requirements is provided for the user , and the specific contents are as follows : 1 . Aiming at the problem of bandwidth resource limitation in heterogeneous wireless networks , a network selection strategy based on bandwidth resource allocation is proposed , the information transmission rate and bandwidth utilization rate of the whole network are maximized under the condition of bandwidth limitation , the information transmission rate of the user is used as the target function , the bandwidth resource limitation is used as the constraint condition , the optimal bandwidth allocation strategy is obtained , and the user is allocated to the most appropriate network . 2 . Combining the network delay and the instantaneous transmission rate , a network selection strategy based on the effective capacity is proposed . In the practical system , different traffic has different time delay requirements , but the traditional Shannon capacity theorem is introduced into the transmission rate based on the effective capacity and the time delay characteristic . Then , a utility function is constructed , and the network with the highest utility function is selected by comparing the utility function of the different networks . The theoretical analysis and simulation experiments show that the network selection policy based on the effective capacity can improve the network throughput under the premise of ensuring the service quality of the user . 3 . Combining the network factors and the instantaneous channel transmission rate based on the effective capacity , a joint network selection strategy is proposed . In the first case , a network selection strategy for joint time delay restriction and resource prediction is proposed for the problem of time delay limitation and network resource uncertainty for different traffic in heterogeneous wireless networks . Firstly , the idle probability and occupancy probability of the next time slot channel resources are predicted , and then the network with sufficient bandwidth resources and maximum transmission rate is selected as the target function by using the information transmission rate based on the effective capacity . In the second case , a network selection strategy based on inter - cell interference and time delay characteristics is proposed for the problem of time delay and inter - cell interference of different traffic in heterogeneous wireless networks . First , according to the power control criterion , the signal and interference plus noise ratio ( SINR ) of the user ' s access network is calculated . Then , the network with the highest SINR is selected by comparing the SINR of the different networks . Theoretical analysis and simulation experiments show that the combined network selection strategy based on inter - cell interference can obtain higher network throughput and user average SINR with the change of network delay restriction conditions . 4 . A network selection strategy based on auction theory is proposed for users in heterogeneous wireless networks . Firstly , a single target second price auction theory is used to analyze the switching network selection strategy . In a switched network selection strategy , users can access more than one network at the same time . In the parallel network selection strategy , users can access more than one network at the same time .

【學(xué)位授予單位】：西安電子科技大學(xué)
【學(xué)位級別】：博士
【學(xué)位授予年份】：2014
【分類號】：TN92

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