本文選題：軟件定義網(wǎng)絡(luò)　切入點：可伸縮視頻編碼　出處：《小型微型計算機系統(tǒng)》2017年03期

【摘要】：傳統(tǒng)的視頻會議系統(tǒng)主要基于多點控制單元(MCU)實現(xiàn),雖然技術(shù)成熟,但是當(dāng)用戶數(shù)增多時會產(chǎn)生較大的時延和通信瓶頸.隨著科技發(fā)展,軟件定義網(wǎng)絡(luò)(SDN)的新模式可實現(xiàn)組播的完全可控,極大地優(yōu)化網(wǎng)絡(luò)流管理.針對視頻會議的基本需求,提出一種基于SDN分層組播的視頻會議系統(tǒng)架構(gòu).該系統(tǒng)舍棄了傳統(tǒng)的互聯(lián)網(wǎng)組管理協(xié)議(IGMP)和MCU硬件設(shè)備,結(jié)合可伸縮視頻編碼(SVC)實現(xiàn)分層視頻組播以滿足不同設(shè)備能力的會議終端需求,SDN控制器實時監(jiān)控網(wǎng)絡(luò)狀態(tài)并動態(tài)地管理和調(diào)節(jié)視頻層數(shù),同時設(shè)計了會議管理服務(wù)器進行會議業(yè)務(wù)的管理.實驗結(jié)果表明,本系統(tǒng)提供了靈活可控的分層視頻流服務(wù),并且可以在保證視頻會議服務(wù)質(zhì)量的前提下節(jié)約帶寬、降低延遲.
[Abstract]:The traditional video conference system is mainly based on multi-point control unit (MCU). Although the technology is mature, when the number of users increases, there will be a great delay and communication bottleneck. The new model of software defined network SDN (SDN) can realize the complete control of multicast and optimize the network flow management greatly. This paper presents a video conferencing system architecture based on SDN hierarchical multicast, which forgoes the traditional Internet Group Management Protocol (IGMP) and MCU hardware devices. Combined with scalable video coding (SVC), layered video multicast is implemented to meet the needs of conference terminals with different capabilities. The SDN controller monitors the network status in real time and dynamically manages and adjusts the number of video layers. At the same time, the conference management server is designed to manage the conference services. The experimental results show that the system provides a flexible and controllable layered video streaming service, and can save bandwidth and reduce delay while ensuring the quality of videoconferencing services.
【作者單位】： 中國科學(xué)技術(shù)大學(xué)自動化系;
【基金】：國家自然科學(xué)基金面上項目(61174062)資助
【分類號】：TN948.63

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