在行動網路中降低回饋量的高效率群播方式

An Efficient Multicast Scheme for Mobile Networks with Reduced Feedback

李文珊(Lee, Grace Wensan)

指導教授 ： 李程輝

國立交通大學/電機學院/電信工程系所/碩士(2018年)

摘要

近年來，由於直播興起，而且觀看直播時需要同時傳遞相同封包給所有觀眾，因此第三代合作夥伴計畫為了長期演進技術定義了演進型多媒體廣播群播服務。單細胞點對多點是多媒體廣播群播服務的一種，它為了確保範圍內絕大多數的使用者設備都能正確地接收並且解出封包，因此演進型節點B傳遞封包時使用最穩健的調變與編碼方案。我們在這篇論文中提出了兩個能夠降低使用者設備回饋量並且提高單細胞點對多點的整體吞吐量的方法。提高吞吐量的方式是傳送時使用較高的調變與編碼方案，而選擇少數使用者設備來回饋則能減少回饋量。我們從模擬中得到的結論是在各種不同數量的使用者設備的環境下我們的方法皆能夠使用，而且總吞吐量能夠達到最大吞吐量的八成，回饋量趨近於零。

關鍵字

降低回饋量 ； 吞吐量 ； 演進型多媒體廣播群播服務 ； 單細胞點對多點

並列摘要

In recent years, the growth of live streaming and the need for video content to be transmitted to many users simultaneously have induced the 3rd Generation Partnership Project (3GPP) to define a broadcast/multicast mode for LTE called evolved Multimedia Broadcast/Multicast Service (eMBMS). One of the schemes of eMBMS, called Singe-Cell Point-to-Multipoint (SC-PTM), uses the most robust modulation and coding scheme (MCS), or the MCS of the UE with the worst channel quality, when transmitting to ensure that most of the user equipment (UE) that are within range can receive and decode packets transmitted from the evolved Node B (eNodeB) correctly. In this thesis, we propose two schemes to improve the throughput of SC-PTM while transmitting minimal UE feedback. The throughput is increased by using a higher MCS, while feedback is minimalized by choosing only a few UEs to transmit feedback. From our simulations, we concluded that our schemes can be used in various numbers of UEs and can achieve about 80% of the maximum possible throughput while transmitting minimal feedback.

並列關鍵字

reduced feedback ； throughput ； eMBMS ； SC-PTM

參考文獻

[1] J. F. Monserrat, J. Calabuig, A. Fernandez-Aguilella and D. Gomez-Barquero, “Joint Delivery of Unicast and E-MBMS Services in LTE Networks,” in IEEE Transactions on Broadcasting, vol. 58, no. 2, pp. 157-167, June 2012.

[2] A. Daher, M. Coupechoux, P. Godlewski, P. Ngouat and P. Minot, “SC-PTM or MBSFN for Mission Critical Communications?” 2017 IEEE 85th Vehicular Technology Conference (VTC Spring), Sydney, NSW, 2017, pp. 1-6.

[3] Y. Cai et al., “Reduced Feedback Schemes for LTE MBMS,” VTC Spring 2009 - IEEE 69th Vehicular Technology Conference, Barcelona, 2009, pp. 1-5.

[4] 3GPP TR 36.890 V13.0.0. “Evolved Universal Terrestrial Radio Access (E-UTRA); Study on single-cell point-to-multipoint transmission for E-UTRA (Release 13),” June 2015.

[5] A. Alexiou, C. Bouras, V. Kokkinos, A. Papazois and G. Tsichritzis, “Efficient MCS selection for MBSFN transmissions over LTE networks,” 2010 IFIP Wireless Days, Venice, 2010, pp. 1-5.