Sidelink Multi-hop Transmission And Resource Allocation Design Based On 3GPP Standard

Self-organized network plays an important role in many scenarios,such as public safety,emergency rescue,and industry-specific networks.However,due to the various standards and poor compatibility of self-organized network terminals produced by different manufacturers,it is difficult for self-organized network terminals to form a stable and largescale market.Recently,inspired by the emerging Sidelink technology,which can support device-to-device communications in-coverage,partial-coverage,and out-of-coverage scenarios and has been specified in 3GPP,studying self-organized network with the standardized terminals has become a research hotspot.Unfortunately,the current Sidelink standard only supports single-hop transmission,which leads to short transmission distance,and fails to satisfy the practical application requirements of self-organized networks.Facing this challenge,we study the key technologies of Sidelink-based self-organized network based on 3GPP standard,including the Sidelink multi-hop transmission protocol and the joint design of routing and resource allocation.The main contributions of this thesis are as follows:(1)We first analyze the feasibility of Sidelink standard-based multi-hop transmission in terms of radio resources,communication modes,and node capabilities.On this basis a multihop transmission scheme for Sidelink is proposed.Specifically,the existing standard is first modified and extended to support multi-hop transmission,including the direct communication link establishment procedure on control plane and end-to-end data forwarding procedure on user plane.Then,we establish a Sidelink multi-hop transmission system-level simulation platform based on the NS-3 platform,which is used to verify the feasibility and effectiveness of the proposed transmission scheme.The simulation results demonstrate that,with the proposed scheme,the communication range between terminals can be extended significantly.(2)Based on the aforementioned transmission protocol,we further propose a joint scheme of routing and resource allocation for Sidelink-based self-organized network to deal with the challenge posed by half-duplex mode and the limited radio resources.In our scheme,partial topology information is used to optimize routing and resource allocation with the aim of maximize the number of concurrent packets.Specifically,we first proposed a two-phase matching routing method with two-hop location information to reduce the packet loss rate caused by the half-duplex mode.Further,under the constraint of consecutive resource blocks,we proposed a resource allocation algorithm to maximize the number of concurrent transmitted packets.The simulation results show that the proposed scheme can effectively improve packet delivery rate and the number of successfully delivered packets transmitted by the network at the same time.