本文選題：MBSFN + 分集增益��； 參考：《電子科技大學(xué)》2015年碩士論文

【摘要】：多播廣播單頻網(wǎng)(Multicast Broadcast Single Frequency Network,MBSFN)為第三代合作伙伴計劃(The Third Generation Partner Project,3GPP)在演進多播組播多媒體服務(wù)(Evolved-Multimedia Broadcast and Multicast Service,E-MBMS)中引入的新的傳輸方式。MBSFN的各小區(qū)同時同頻傳輸相同的業(yè)務(wù)的特性,使得MBSFN用戶能夠接收來自多個小區(qū)的分集增益,從而有效解決了多播組播多媒體服務(wù)(Multimedia Broadcast and Multicast Service,MBMS)中對無線資源利用不充分、業(yè)務(wù)接收不穩(wěn)定以及盲區(qū)覆蓋等問題,極大提高了頻譜利用率和覆蓋率。然而,MBSFN作為一種增強性的多播方式,雖然增強了多播業(yè)務(wù)的傳輸性能,但其在資源分配時依然受到信道質(zhì)量差用戶的限制,使得信道質(zhì)量好的用戶無法充分利用信道資源。在MBSFN中,所有的MBSFN小區(qū)使用相同的資源同時發(fā)送多播業(yè)務(wù),如若根據(jù)信道質(zhì)量最差用戶來分配多播資源,MBSFN的統(tǒng)一資源分配特性會使得某些信道質(zhì)量差用戶影響到整個單頻網(wǎng)的資源分配,從而多個小區(qū)的用戶無法充分利用信道資源,甚至?xí)䦟δ承┬^(qū)產(chǎn)生過高的負載,而影響該小區(qū)下其他用戶的業(yè)務(wù)質(zhì)量。針對該問題,本文設(shè)計了MBSFN下基于設(shè)備到設(shè)備(Device to Device,D2D)中繼的協(xié)作多播策略。該策略利用D2D技術(shù),讓信道質(zhì)量差用戶通過D2D中繼得到業(yè)務(wù)保證,從而在對MBSFN多播進行資源調(diào)度時可以不考慮信道質(zhì)量差用戶的限制,而充分利用多播信道資源。當(dāng)有信道質(zhì)量差用戶的多播業(yè)務(wù)無法得到保障時,通過信道質(zhì)量好用戶中繼多播數(shù)據(jù)來保障信道質(zhì)量差用戶多播業(yè)務(wù)的需求,從而最終達到充分利用多播信道資源,保障用戶業(yè)務(wù)需求的目的。另外,根據(jù)MBSFN的傳輸特性及3GPP標準的規(guī)定,MBSFN下的Idle態(tài)用戶也能接收多播業(yè)務(wù),且當(dāng)用戶從MBSFN小區(qū)移動到一般小區(qū)時傳統(tǒng)小區(qū)重選無法保證其業(yè)務(wù)連續(xù)性。因此,在MBSFN邊緣的Idle態(tài)用戶小區(qū)重選,需要考慮業(yè)務(wù)連續(xù)性的問題。其次,MBSFN分集增益的特性,使得小區(qū)的參考信號強度已不足以表征多播信道質(zhì)量的好壞,一般小區(qū)重選方法已不足以保證其重選的有效性。因此,為了保證Idle態(tài)用戶從MBSFN邊緣移動到非MBSFN小區(qū)時的業(yè)務(wù)連續(xù)性,提高小區(qū)重選的性能,本文根據(jù)Idle態(tài)用戶在MBSFN傳輸方式下的特殊性以及MBSFN的分集增益特點,設(shè)計了多播廣播單頻網(wǎng)邊緣的小區(qū)重選策略。該策略使用多播廣播單頻網(wǎng)參考信號以及根據(jù)多播信道質(zhì)量決定信道切換時刻,保證用戶在MBSFN邊緣重選時業(yè)務(wù)連續(xù)性,同時減少不必要的小區(qū)重選,充分利用多播資源,提高了小區(qū)重選效率。
[Abstract]:Multicast Broadcast Single Frequency Network (MBSFN) is the third generation partner program, the Third Generation Partner Project 3GPP, introduced in the evolving multicast multimedia service, Evolved-Multimedia Broadcast and Multicast Service E-MBMS.MBSFN 's cells transmit the same services at the same time as frequency. This enables MBSFN users to receive diversity gains from multiple cells, thus effectively solving the problems of inadequate utilization of wireless resources, unstable service reception and blind area coverage in multicast multimedia service (Multimedia Broadcast and Multicast Service MMS). The spectrum efficiency and coverage are greatly improved. However, as an enhanced multicast mode, MBSFN enhances the transmission performance of multicast services, but it is still limited by poor channel quality users in resource allocation, which makes the users with good channel quality unable to make full use of channel resources. In MBSFN, all MBSFN cells use the same resources to send multicast services at the same time, If multicast resources are allocated according to the worst users of the channel, the unified resource allocation characteristics of MBSFN will cause some poor channel users to affect the resource allocation of the whole single-frequency network, so that the users in multiple cells cannot make full use of the channel resources. It may even cause excessive load on some cells and affect the service quality of other users in the cell. To solve this problem, this paper designs a cooperative multicast strategy based on device to device D2D relay in MBSFN. In this strategy, D2D technology is used to ensure the service of the poor channel users through D2D relay, so that the resource scheduling of MBSFN multicast can make full use of the multicast channel resources without considering the limitations of the poor channel users. When the multicast service with poor channel quality can not be guaranteed, the demand of multicast service can be guaranteed by relaying multicast data to the users with good channel quality, so as to make full use of the multicast channel resources. The purpose of protecting the user's business needs. In addition, according to the transmission characteristics of MBSFN and the regulation of 3GPP standard, the Idle users under MBSFN can also receive multicast services, and the traditional cell reselection can not guarantee its business continuity when the user moves from the MBSFN cell to the general cell. Therefore, the problem of business continuity should be considered when the Idle user cell is reselected at the edge of MBSFN. Secondly, because of the characteristic of MBSFN diversity gain, the cell reference signal strength is not enough to characterize the quality of the multicast channel, and the general cell reselection method is not enough to ensure the effectiveness of the cell reselection. Therefore, in order to ensure the business continuity of Idle users moving from the edge of MBSFN to non-MBSFN cells and improve the performance of cell reselection, according to the particularity of Idle users in MBSFN transmission mode and the characteristics of MBSFN diversity gain, A cell reselection strategy for the edge of multicast single frequency network is designed. In this strategy, the multicast single frequency network reference signal is used and the channel switching time is determined according to the quality of the multicast channel, which ensures the business continuity during the MBSFN edge reselection, reduces unnecessary cell reselection, and makes full use of the multicast resources. The efficiency of cell gravity selection is improved.
【學(xué)位授予單位】：電子科技大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TN929.5

【參考文獻】

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本文編號：1973610