本文選題：異構(gòu)網(wǎng)絡(luò) + 分層組播��； 參考：《重慶郵電大學(xué)》2016年碩士論文

【摘要】：如何實現(xiàn)高速視頻傳輸一直是產(chǎn)業(yè)界和學(xué)術(shù)界所追逐的研究熱點之一,一方面視頻傳輸速率提高是發(fā)展信息服務(wù)業(yè)務(wù)的重要推動力,另一方面業(yè)務(wù)多樣性和網(wǎng)絡(luò)架構(gòu)異構(gòu)化對視頻傳輸?shù)难芯刻岢隽诵乱蟆７謱咏M播技術(shù)可以較好地解決異構(gòu)網(wǎng)絡(luò)中用戶對視頻流差異性需求,為此論文分別以提高系統(tǒng)吞吐量、系統(tǒng)頻帶利用率為目標(biāo),基于用戶簇重點分析分層組播的層速率優(yōu)化和簇內(nèi)D2D組播重傳算法。具體研究內(nèi)容如下:1.針對異構(gòu)網(wǎng)絡(luò)分層組播的分層速率優(yōu)化問題是NP-Hard問題,提出一種基于用戶簇的分層速率分配優(yōu)化算法,算法根據(jù)用戶理論帶寬及其用戶數(shù)進(jìn)行分層,求出每個分層的分層速率及相應(yīng)的傳輸子圖,并為每個分層的接收用戶分配鏈路帶寬,在充分復(fù)用已分配帶寬的用戶鏈路基礎(chǔ)上,選擇具有最大節(jié)點度的路徑進(jìn)行合理的鏈路帶寬分配,為更高層接收預(yù)留更多資源。進(jìn)一步結(jié)合用戶分簇思想,將多個分層合并為預(yù)定分層,從全局角度實現(xiàn)分層速率優(yōu)化并進(jìn)行鏈路帶寬的分配。仿真實驗表明,相比于已有的分層速率優(yōu)化算法,所提出的基于用戶簇的分層速率分配優(yōu)化算法能改善系統(tǒng)吞吐量等性能指標(biāo)。2.針對簇內(nèi)用戶丟失數(shù)據(jù)包的恢復(fù)問題,提出一種簇內(nèi)兩級D2D組播重傳算法,算法在充分考慮差異性D2D鏈路質(zhì)量的基礎(chǔ)上,模型化系統(tǒng)鏈路代價,采用兩級組播重傳實現(xiàn)簇內(nèi)用戶所有錯誤包的恢復(fù),從而減少組播次數(shù)增加帶來的額外信令開銷及單播概率,同時定義平均用戶鏈路代價輔助選擇組播子簇,排除重復(fù)組播,并將一次組播完成后已恢復(fù)丟失數(shù)據(jù)包的用戶轉(zhuǎn)化為備選組播發(fā)送者,進(jìn)一步提升系統(tǒng)頻帶利用率性能。仿真實驗表明,與已有D2D組播重傳算法相比,所提出的簇內(nèi)兩級D2D組播重傳算法可以改善系統(tǒng)鏈路代價等性能指標(biāo)。
[Abstract]:How to achieve high-speed video transmission has been one of the hot research topics pursued by industry and academia. On the one hand, improving video transmission rate is an important driving force for the development of information services. On the other hand, the diversity of services and the isomerization of network architecture put forward new requirements for the research of video transmission. Hierarchical multicast technology can solve the different demand of users for video streams in heterogeneous networks. Therefore, this paper aims to improve the system throughput and the system frequency band efficiency. Layer rate optimization and D2D multicast retransmission algorithm are analyzed based on user clusters. The specific contents of the study are as follows: 1. Aiming at the hierarchical rate optimization problem of hierarchical multicast in heterogeneous networks is the NP-Hard problem, a hierarchical rate allocation optimization algorithm based on user clusters is proposed, which is based on the theoretical bandwidth of users and the number of users. The delamination rate of each layer and the corresponding transmission subgraph are calculated, and the link bandwidth is allocated to each layered receiving user, on the basis of fully multiplexing the allocated bandwidth of the user link, The path with the maximum node degree is chosen to allocate the link bandwidth reasonably, and more resources are reserved for the higher level reception. Combined with the idea of user clustering, multiple layers are merged into predetermined layers to optimize the hierarchical rate and allocate the link bandwidth from a global perspective. Simulation results show that compared with the existing hierarchical rate optimization algorithm, the proposed hierarchical rate allocation algorithm based on user clusters can improve the system throughput and other performance indicators. A two-level D2D multicast retransmission algorithm is proposed to recover the lost packets of users in the cluster. The algorithm models the system link cost on the basis of considering the different D2D link quality. Two-level multicast retransmission is used to restore all error packets of users in the cluster, which can reduce the additional signaling overhead and unicast probability brought by the increase of multicast frequency. At the same time, the average user link cost is defined to assist the selection of multicast subclusters, and duplication multicast is eliminated. The users who have recovered the lost packets after a multicast completion are transformed into alternative multicast senders to further improve the bandwidth utilization performance of the system. The simulation results show that compared with the existing D2D multicast retransmission algorithm, the proposed two-level D2D multicast retransmission algorithm can improve the system link cost and other performance indicators.
【學(xué)位授予單位】：重慶郵電大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2016
【分類號】：TN929.5

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本文編號：1895841