A Survey on Low Latency towards 5G: RAN, Core Network and Caching Solutions
The demand for rich multimedia services over mobile networks has been soaring at a tremendous pace over recent years. However, due to the centralized architecture of current cellular networks, the wireless link capacity as well as the bandwidth of the radio access networks and the backhaul network cannot practically cope with the explosive growth in mobile traffic. Recently, we have observed the emergence of promising mobile content caching and delivery techniques, by which popular contents are cached in the intermediate servers (or middle boxes, gateways, or routers) so that demands from users for the same content can be accommodated easily without duplicate transmissions from remote servers; hence, redundant traffic can be significantly eliminated. In this article, we first study techniques related to caching in current mobile networks, and discuss potential techniques for caching in 5G mobile networks, including evolved packet core network caching and radio access network caching. A novel edge caching scheme based on the concept of content centric networking or informationcentric networking is proposed. Using trace driven simulations, we evaluate the performance of the proposed scheme and validate the various advantages of the utilization of caching content in 5G mobile networks. Furthermore, we conclude the article by exploring new relevant opportunities and challenges. INTRODUCTION Along with recent advances in mobile communication technologies, an ever growing number of mobile users are continuously attracted to enjoy a wide plethora of multimedia services using smartphones and tablets [1] While the demand for rich multimedia content has increased tremendously in recent years, the capacity of the wireless link mobile radio network, mobile backhaul, and mobile core network cannot practically cope with the explosively growing mobile traffic due to the centralized nature of mobile network architectures [1] Indeed, despite the continuous efforts of mobile network operators (MNOs) and network equipment vendors to enhance the wireless link bandwidth by adopting sophisticated techniques at both the physical (PHY) layer and medium access control (MAC) layers in Long Term Evolution (LTE) and LTE Advanced systems, such as massive multiple input multiple output (MIMO) carrier aggregation, and coordinated multipoint (CoMP) transmission, the utilization efficiency of the radio spectrum is notably reaching its theoretical cap. Stemming from the observation regarding the traffic explosion problem as studied in [2 4] an important portion of mobile multimedia traffic is due to duplicate downloads of a few popular contents (e.g. popular music videos) with large sizes. Therefore, researchers and engineers have been investigating effective ways to reduce the duplicate content transmissions by adopting intelligent caching strategies inside the mobile networks, and enabling mobile users to access popular content from caches of nearby MNO gateways (e.g. using selective IP traffic offload techniques [5, 6] From the perspective of Internet Cite this article as: Udayagiri Mounisha Smt.Shaik.Taj Mahaboob, "A Survey on Low Latency towards 5G: RAN, Core Network and Caching Solutions" International Journal Magazine of Engineering, Technology, Management and Research, Volume 6 Issue 1, 2019, Page 116 124.