In this paper we study the recording and watching patterns of DVR users using real traces. Many DVR users complain about running out of space. Thus, we propose the idea of adding extra storage on the network. Storing content in the network would create a new challenge, as most of users use their DVR during prime-time resulting in congesting the already strained network with unicast streams. We develop statistical models that learn the behavior of users and are most likely to make watched programs readily available for users each day. We develop a simple caching technique that captures the dominant factors of user behavior. Our verification, using real traces, shows that this technique performs as efficiently as more advanced statistical models, while requiring only a small state to be maintained.
{"title":"Managing home and network storage of television recordings: \"I filled my DVR again! Now what?\"","authors":"Raymond Sweha, Donald E. Smith, J. Drew","doi":"10.1145/1989240.1989262","DOIUrl":"https://doi.org/10.1145/1989240.1989262","url":null,"abstract":"In this paper we study the recording and watching patterns of DVR users using real traces. Many DVR users complain about running out of space. Thus, we propose the idea of adding extra storage on the network. Storing content in the network would create a new challenge, as most of users use their DVR during prime-time resulting in congesting the already strained network with unicast streams. We develop statistical models that learn the behavior of users and are most likely to make watched programs readily available for users each day. We develop a simple caching technique that captures the dominant factors of user behavior. Our verification, using real traces, shows that this technique performs as efficiently as more advanced statistical models, while requiring only a small state to be maintained.","PeriodicalId":254694,"journal":{"name":"Proceedings of the 21st international workshop on Network and operating systems support for digital audio and video","volume":"26 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124530691","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
In this paper, we present an approach for in-network adaptation of H.264/SVC in the context of 802.11 wireless networks. It builds upon our previous work on an adaptive RTSP/RTP proxy which allows to adapt video streams on Linux-based home router platforms. The proposed approach tackles the throughput variations that occur as a consequence of the physical rate adaptation in 802.11 equipment caused by the mobility of clients. By combining monitoring information available exclusively on the wireless router with the ability to adapt scalable video streams on-the-fly, the proposed in-network adaptation approach allows to quickly adjust the video bit rate to the current link conditions. Instead of reacting on packet loss, our approach uses an increase in queueing delay at the router to detect phases of throughput degradation. This allows a higher responsiveness compared to traditional end-to-end approaches that rely solely on RTCP feedback. The behavior of our novel approach was evaluated in several mobility scenarios in an experimental test bed. The results obtained by streaming and adapting high-definition content clearly demonstrate the feasibility and benefits of this approach.
{"title":"In-network adaptation of H.264/SVC for HD video streaming over 802.11g networks","authors":"Ingo Kofler, R. Kuschnig, H. Hellwagner","doi":"10.1145/1989240.1989245","DOIUrl":"https://doi.org/10.1145/1989240.1989245","url":null,"abstract":"In this paper, we present an approach for in-network adaptation of H.264/SVC in the context of 802.11 wireless networks. It builds upon our previous work on an adaptive RTSP/RTP proxy which allows to adapt video streams on Linux-based home router platforms. The proposed approach tackles the throughput variations that occur as a consequence of the physical rate adaptation in 802.11 equipment caused by the mobility of clients. By combining monitoring information available exclusively on the wireless router with the ability to adapt scalable video streams on-the-fly, the proposed in-network adaptation approach allows to quickly adjust the video bit rate to the current link conditions. Instead of reacting on packet loss, our approach uses an increase in queueing delay at the router to detect phases of throughput degradation. This allows a higher responsiveness compared to traditional end-to-end approaches that rely solely on RTCP feedback. The behavior of our novel approach was evaluated in several mobility scenarios in an experimental test bed. The results obtained by streaming and adapting high-definition content clearly demonstrate the feasibility and benefits of this approach.","PeriodicalId":254694,"journal":{"name":"Proceedings of the 21st international workshop on Network and operating systems support for digital audio and video","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125806194","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Proceedings of the 21st international workshop on Network and operating systems support for digital audio and video","authors":"","doi":"10.1145/1989240","DOIUrl":"https://doi.org/10.1145/1989240","url":null,"abstract":"","PeriodicalId":254694,"journal":{"name":"Proceedings of the 21st international workshop on Network and operating systems support for digital audio and video","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114233378","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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