| The Functional Split provides the possibility for flexibility setup of 5G Radio Access Network(RAN),and also poses new requirements and challenges for 5G bearing network technology.Enhanced Mobile Broad Band(e MBB),ultra Reliable Low Latency Communication(u RLLC),and massive Machine Type Communication(m MTC)are the three major application scenarios of 5G,which require high bandwidth,low latency,and dense connectivity for 5G bearing networks respectively.As an effective bearing network solution,passive optical network(PON)can well meet the low latency and large bandwidth requirements of 5G fronthaul network and 5G midhaul network.As an important component of the bearing network system,bandwidth allocation plays an important role in reducing latency and improving bandwidth utilization.With the continuous improvement of single wavelength capacity of PON,providing high capacity is no longer the main goal of bandwidth allocation algorithm.Meanwhile,how to reduce the latency of upstream traffic in the bearing network has become a huge challenge that needs to be faced.Therefore,based on the 5G bearing network technology of PON,this paper develops latency optimization resource allocation strategies for the 5G bearing network oriented PON,aiming at the coexistence of multiple services and the problem of excessive upstream latency.In response to the problem of excessive upstream latency in the bearing network with multiple services coexisting within the system,this paper mainly conducts the following research work:1)Firstly,the research background and significance of dynamic bandwidth allocation scheme in PON system are summarized,and the research status of dynamic bandwidth allocation scheme based on PON is analyzed.Then,it summarizes the evolution process of RAN architecture and PON technology standards.In the RAN architecture,the characteristics and application scenarios of different functional split options are analyzed in detail.And the main PON standard in the evolution of PON standard is introduced.Finally,different types of bandwidth allocation schemes in PON based5 G bearing network are introduced in detail.2)To solve the problem of excessive upstream latency of multi-service coexistence system in5 G fronthaul network,a resource allocation scheme based on the double polling mechanism in EPON for 5G fronthaul network is proposed.Based on the characteristics of current multi-service coexistence networks,a double polling mechanism is proposed and applied to the upstream transmission of 5G fronthaul network.Combining the characteristics of 5G fronthaul network,a scheduling method based on CO DBA is adopted in the 5G fronthaul network.Finally,simulation experiment is conducted to verify the feasibility and performance advantages of this scheme in each scenario.3)To solve the problem of excessive upstream latency of multi-service coexistence system in5 G midhaul network,a resource allocation scheme based on the double polling mechanism in EPON for 5G midhaul network is proposed.This scheme is based on the status report mechanism and combined with the double polling mechanism to allocate resource for two priority services within the PON system.Through simulation performance analysis,this scheme can effectively reduce the latency of u RLLC service and improve the reliability of u RLLC service compared to the benchmarks.4)The poisson distribution is used to simulate the upstream traffic model of 5G midhaul network in the dynamic bandwidth allocation scheme of 5G midhaul network.However,the data of upstream at the DU end will be processed by the physical layer,MAC layer and even the radio link control layer,and it is impossible to continue to arrive at the ONU end according to the poisson distribution.Therefore,this paper analyzes the traffic model of 5G midhaul network,and proposes a resource allocation scheme based on the traffic model in XGS-PON for 5G midhaul network.Finally,the feasibility and advantages of this scheme are verified through simulation experiments. |
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