TAG: Real-Time Immersive Content Delivery in Ultra Dense Networks with Wireless Mesh Backhaul

Real-time immersive content delivery requires a lot of bandwidth. Wireless backhaul can provide high link bandwidth and is a possible approach supporting the deployment of a UDN. With wireless backhaul, the UDN could provide higher bandwidth for UEs without expensive deploying cost. However, the spatial and temporal fluctuation of traffic flows in the UDN could cause congestion at some links, and then packet loss may occur. Under this circumstance, the quality of real-time immersive content would be degraded significantly. To overcome above mentioned problem, a Take-And-Give (TAG) mechanism is proposed to adaptively and reliably manage packet forwarding in the UDN with wireless mesh backhaul. With TAG, packets of several traffic flows are linearly combined at the eNB before forwarding to SBSs. Each SBS individually and inearly combines the combined packets again and manages number of packets forwarded to next hop according to the available link bandwidth. When spare bandwidth exists, TAG mechanism ''takes'' the available bandwidth to send additional linearly combined packets. TAG mechanism ''gives'' the transmission opportunity when no spare bandwidth is left. The SBS with direct connection to destinated UEs recover received packets, and then forwards packets to the corresponding UEs. As a consequence, the content can be delivered more reliably. Evaluation results show the effectiveness of the proposed TAG in delivering real-time immersive content in the network.