發(fā)布時(shí)間：2019-05-08 06:50

【摘要】：近年來(lái),移動(dòng)終端的視頻流量發(fā)生爆炸式的增長(zhǎng)。思科研究報(bào)告預(yù)測(cè)移動(dòng)終端視頻流量將會(huì)在2020年超過(guò)電腦視頻流量,甚至?xí)紦?jù)全網(wǎng)絡(luò)流量的82%。在LTE無(wú)線網(wǎng)絡(luò)環(huán)境中視頻流量占總流量的比率已經(jīng)達(dá)到了 40%,而且這個(gè)數(shù)字還在持續(xù)增加。因此,研究用戶在移動(dòng)終端上的視頻體驗(yàn)具有理論和社會(huì)價(jià)值。用戶在移動(dòng)終端上的用戶體驗(yàn)既與視頻傳輸本身的特征有關(guān),還受電池容量的限制。用戶觀看視頻的行為會(huì)給移動(dòng)終端帶來(lái)巨大的電量消耗,直接制約著用戶的觀看時(shí)間,從而影響用戶的觀看體驗(yàn)。本論文首先通過(guò)實(shí)際網(wǎng)絡(luò)測(cè)量數(shù)據(jù)分析移動(dòng)終端用戶觀看視頻的行為特點(diǎn)和用戶體驗(yàn),在此基礎(chǔ)上提出兩種針對(duì)無(wú)線蜂窩網(wǎng)絡(luò)的視頻傳輸機(jī)制,這兩種機(jī)制可以降低移動(dòng)終端觀看視頻的電量,提高用戶觀看體驗(yàn)。本文主要內(nèi)容如下:(1)根據(jù)大量的某視頻應(yīng)用日志統(tǒng)計(jì)分析視頻數(shù)據(jù)。首先,對(duì)用戶觀看視頻使用的移動(dòng)設(shè)備信息進(jìn)行了統(tǒng)計(jì),包括屏幕大小、分辨率、內(nèi)存大小、電池容量、價(jià)格。其次,統(tǒng)計(jì)了用戶觀看視頻的行為特征,包括用戶選擇的視頻編碼速率、網(wǎng)絡(luò)類(lèi)型、用戶觀看視頻長(zhǎng)度及觀看時(shí)間、用戶的視頻完成率等。最后,對(duì)影響視頻中斷的因素進(jìn)行了統(tǒng)計(jì)分析。(2)提出一種叫做"等長(zhǎng)度能量感知視頻塊選擇機(jī)制"的視頻傳輸機(jī)制,基本思想是在設(shè)計(jì)視頻塊大小時(shí)需要考慮如下因素:無(wú)線蜂窩網(wǎng)絡(luò)的網(wǎng)卡的Tail狀態(tài)監(jiān)聽(tīng)模式帶來(lái)的浪費(fèi)電量;由于用戶提前離開(kāi)導(dǎo)致的無(wú)效的數(shù)據(jù)傳輸。該機(jī)制將建立一個(gè)數(shù)學(xué)模型,該模型給出了一個(gè)視頻塊的大小的計(jì)算方法。數(shù)值結(jié)果分析表明采用這種機(jī)制下載視頻可以降低上述兩種因素導(dǎo)致的耗電量。(3)提出一種叫做"變長(zhǎng)度能量感知視頻塊選擇機(jī)制"的視頻傳輸機(jī)制,基本思想是:根據(jù)實(shí)際的網(wǎng)絡(luò)測(cè)量數(shù)據(jù)發(fā)現(xiàn),用戶繼續(xù)觀看視頻的時(shí)間分布將隨著已經(jīng)觀看的時(shí)間發(fā)生變化;在此基礎(chǔ)上,視頻塊的大小應(yīng)該隨著用戶已經(jīng)觀看的時(shí)間發(fā)生變化。根據(jù)這個(gè)觀察,該機(jī)制建立了一個(gè)數(shù)學(xué)模型,在給定用戶已經(jīng)觀看的時(shí)間長(zhǎng)度條件下,該模型將得出一個(gè)下載視頻塊長(zhǎng)度的序列。本機(jī)制通過(guò)數(shù)值對(duì)比分析實(shí)驗(yàn),證明了在相同的用戶觀看行為條件下可以節(jié)約更多的電量。
[Abstract]:In recent years, video traffic in mobile terminals has exploded. The Cisco study predicts that mobile video traffic will exceed computer video traffic by 2020, or even 82 percent of network-wide traffic. The ratio of video traffic to total traffic in the LTE wireless network has reached 40 percent, and that number continues to increase. Therefore, it is of theoretical and social value to study the video experience of users on mobile terminals. The user experience on the mobile terminal is not only related to the characteristics of the video transmission itself, but also limited by the battery capacity. The behavior of watching video will bring huge power consumption to the mobile terminal, which directly restricts the viewing time of the user, and thus affects the viewing experience of the user. Firstly, this paper analyzes the behavior characteristics and user experiences of mobile end-users watching video through the actual network measurement data, and then proposes two video transmission mechanisms for wireless cellular networks, based on which, two video transmission mechanisms for wireless cellular networks are proposed. These two mechanisms can reduce the power of mobile terminals to watch video and improve the user viewing experience. The main contents of this paper are as follows: (1) Statistical analysis of video data based on a large number of video application logs. First, the mobile device information used by users to watch video is counted, including screen size, resolution, memory size, battery capacity, and price. Secondly, the behavior characteristics of users watching video are analyzed, including the video coding rate, network type, the length and time of watching video, and the completion rate of video. Finally, the factors affecting video interruption are statistically analyzed. (2) A video transmission mechanism called "equal-length energy-sensing video block selection mechanism" is proposed. The basic idea is to consider the following factors when designing the video block size: the waste of power caused by the Tail state monitoring mode of the network card in the wireless cellular network; Invalid data transfer due to early departure of the user. This mechanism will establish a mathematical model, which gives a calculation method of the size of a video block. Numerical results show that the power consumption caused by these two factors can be reduced by using this mechanism. (3) A video transmission mechanism called variable-length energy-sensing video block selection mechanism is proposed. The basic idea is as follows: according to the actual network measurement data, the distribution of time for users to continue watching video will change with the time that they have watched; On this basis, the size of the video block should change with the time the user has watched. Based on this observation, the mechanism establishes a mathematical model. Given the length of time the user has watched, the model will obtain a sequence of download video block lengths. Through numerical comparison and analysis experiments, this mechanism proves that it can save more electricity under the same user viewing behavior.
【學(xué)位授予單位】：北京交通大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類(lèi)號(hào)】：TN929.5

【引證文獻(xiàn)】

相關(guān)碩士學(xué)位論文 前1條

1 王璐;無(wú)線網(wǎng)絡(luò)的視頻測(cè)量和內(nèi)容感知的帶寬分配機(jī)制研究[D];北京交通大學(xué);2018年

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本文編號(hào)：2471696