In this paper, we primarily address

In this paper, we primarily addressed constant-bit-rate videos,and multiple quality or resolution versions of the same video used for progressive download,or adaptive bit rate(ABR) streaming,are treated as different videos.Consequently,depending on the cache policy(proactive or reactive) and the nature of requests, multiple quality/resolution versions of the same video may have to be cached at the same(e)NodeB, leading to inefficient use of the limited sized RAN caches. In the future, techniques need to be developed to address the above problem, in particular in the context of ABR streaming, which is gaining popularity. With ABR-capable streaming, multiple bit-rate versions of a video can be requested by a mobile client during a video session due to varying network conditions,making the problem of efficient video caching even more difficult. In [44], we have proposed a new architecture supplementing (e)nodeB caches with limited processing capability, and a joint caching and video processing algorithm that not only caches the videos with the bit rate that is most likely to be requested by the users within the cell, but also uses the (e)NodeB processor to transcode the videos to the desired bit rate. Preliminary results show the feasibility of improving the cache hit ratio significantly over the current approach that needs to cache all bit rate versions. In the future, we plan to further improve ABR caching and extend ABR-capable caching for
proactive caching policies. Furthermore, we plan to extend our RAN caching approach to hierarchical caching at the gateways of the core network to support mobility of users across cells and increase network capacity