Enhancing software-defined RAN with collaborative caching and scalable video coding

Ruozhou Yu, Shuang Qin, Mehdi Bennis, Xianfu Chen, Gang Feng, Zhu Han, Guoliang Xue

    Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientificpeer-review

    39 Citations (Scopus)


    The ever increasing video demands from mobile users have posed great challenges to cellular networks. To address this issue, video caching in radio access networks (RANs) has been recognized as one of the enabling technologies in future 5G mobile networks, which brings contents near the end-users, reducing the transmission cost of duplicate contents, meanwhile increasing the Quality-of-Experience (QoE) of users. Inspired by the emerging software-defined networking technology, recent proposals have employed centralized collaborative caching among cells to further increase the caching capacity of the RAN. In this paper, we explore a new dimension in video caching in software-defined RANs to expand its capacity. We enable the controller with the capability to adaptively select the bitrates of videos received by users, in order to maximize the number and quality of video requests that can be served, meanwhile minimizing the transmission cost. To achieve this, we further incorporate Scalable Video Coding (SVC), which enables caching and serving sliced video layers that can serve different bitrates. We formulate the problem of joint video caching and scheduling as a reward maximization (cost minimization) problem. Based on the formulation, we further propose a 2-stage rounding-based algorithm to address the problem efficiently. Simulation results show that using SVC with collaborative caching greatly improves the cache capacity and the QoE of users.
    Original languageEnglish
    Title of host publicationCommunications (ICC), 2016 IEEE International Conference on
    PublisherIEEE Institute of Electrical and Electronic Engineers
    ISBN (Electronic)978-1-4799-6664-6
    ISBN (Print)978-1-4799-6665-3
    Publication statusPublished - 14 Jul 2016
    MoE publication typeA4 Article in a conference publication
    EventIEEE International Conference on Communications, ICC 2016: Communications for All Things - Kuala Lumpur, Malaysia
    Duration: 23 May 201627 May 2016


    ConferenceIEEE International Conference on Communications, ICC 2016
    Abbreviated titleICC 2016
    CityKuala Lumpur


    • 5G mobile networks
    • collaborative video caching
    • scalable Video Coding
    • doftware-defined radio access network


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