5G Oriented Research On Ultra Low Latency Network Transmission Technology

With the development of mobile Internet and 5G mobile communication, ultra-low-latency network transmission technology is emphasized gradually. There are a lot of new challenges about ultra-low-latency network transmission technology since the various kind of ultra-low-latency traffic. Similar to Internet of Vehicles, Internet of Things, Smart Grid, Tele-medicine, Mobile Gaming, Emergency monitoring, we will define this type of traffic as ultra-low-latency traffic which requires transmission delay less than 50 ms.Current network environment can’t satisfy latency requirements of the ultra-low-latency traffic: firstly, in mobile Internet and Internet of Things, the massive terminal generates a wide variety of ultra-low-latency traffic and various ultra-low-latency traffic are different in delay requirements, so the traditional network architecture can’t satisfy different delay requirements of the different ultra-low-latency traffic. Secondly, signaling interaction of traditional terminal-oriented resource allocation is tremendous and traditional network is unable to satisfy the end to end delay requirements of ultra-low-latency traffic.In this thesis, we propose software-defined network(SDN) architecture to solve the problem that the traditional transmission network can’t satisfy the transmission needs of all kinds of massive ultra-low-latency traffic. on one hand the control plane and data plane separation characteristics makes the traditional network control plane operations integrated in the controller and reduces the load and processing delay in transmission equipment, on the other hand, the software definability provides scalability about achieving different control strategy on different ultra-low-latency.Resource reservation method has been proposed to reduce end to end delay of the traditional network resulting from resource application and resource allocation about ultra-low-latency traffic. Resource reservation of the radio network reduces latency of wireless resources application. The core network resource reservation reduces the core network delay of bearer set-up. In addition, we use content-centric network to classify the ultra-low-latency traffic which can solve the resource reservation problem of massive terminal. By content categories we can achieve clustering terminal operation and by matching the content of the reservation resource, the ultra-low-latency can forward easily.The introduction of software-defined network architecture reduces the processing and forwarding delay in network transmission equipment. The radio network resource reservation reduces resource application and resource allocation delay, and the core network resource reservation reduces the core network delay of bearer set-up. In addition, network transmission equipment can use reserved resource to forward ultra-low-latency traffic which reduces matching and forwarding delay by mapping content. The establishment of a virtual circuit between terminals reduces the end of the delay which can satisfy the requirements of ultra-low-latency traffic delay.Although we reserve resources for ultra-low-latency traffic, a lot of terminals compete to use content-oriented reserved resources for transmitting data, we explore the number of terminals which is carried by one reserved resource. So this thesis will use the mathematical model to explore specific parameters for optimizing the process parameters configuration about reserved resources on the wireless.