Low-Latency Oriented Network Planning for MEC-Enabled WDM-PON Based Fiber-Wireless Access Networks

Xin Wang,Yuefeng Ji,Lin Bai,Jiawei Zhang,Min Zhang

doi:10.1109/access.2019.2926795

Xin Wang, Yuefeng Ji + Show 3 more

Open Access

https://doi.org/10.1109/access.2019.2926795

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Abstract

WDM-PON-based mobile edge computing (MEC)-enabled fiber wireless access networks (MFWAN) have been identified as a promising technology for next-generation broadband access. Low-latency oriented network planning of the WDM-PON-based MFWAN would be required for low-latency access to newly emerging latency-sensitive applications in the fifth-generation (5G) era. However, this would require a low-latency oriented network design in the network planning phase and has thus become a crucial challenge. In this paper, we investigate low-latency oriented network planning of the WDM-PON-based MFWAN under physical and management constraints. To this end, we develop a mathematical model to minimize total transmission latency for all latency-sensitive services. Our model is composed of the propagation latency on the paths and the processing latency on the network equipment and is subject to constraints of maximal transmission distance, maximal PON power budget, bandwidth requests, and the fronthaul latency limit under some functional split options. Given the model’s complexity, we also propose a heuristic algorithm called latency-minimized integrated multi-associated positioning and routing algorithm (LMI-MAPRA). The simulation results show that the proposed algorithm outperforms the benchmark algorithm with more total transmission latency reductions in both sparse and dense networks. We also analyze the impact of key parameters on comparisons of different approaches in terms of low-latency optimal performances.

Highlights

Future fifth generation (5G) networks will inspire different types of new applications, new network architectures, and new spectrum usages
According to the network architecture evolution from 3GPP technical reports, the original two-level RAN composed of Base Band Unit (BBU) and Remote Radio Unit (RRU) in 4G is disaggregated into three level RAN composed of Central Unit (CU), Distributed Unit (DU), and Active Antenna Unit (AAU) in 5G [11]–[13]
Given the sets of candidate positions of mobile edge computing (MEC) servers, the CUDU co-located with OLT (CUDU-OLT), AWGs, and all positions of AAU co-located with ONU (AAU-ONU) as shown in Fig. 4 (a), our low-latency oriented WDM-Passive optical networks (PON) based MEC-enabled Fiber-Wireless Access Network (MFWAN) planning problem is to find out the optimal configuration

Summary

INTRODUCTION

Future fifth generation (5G) networks will inspire different types of new applications, new network architectures, and new spectrum usages. We will focus on how to minimize total transmission latency including the propagation latency along the paths and the processing latency on network equipments over the WDM-PON based MEC-enabled Fiber Wireless Access Networks for all latency-sensitive services at our best efforts. Given the sets of candidate positions of MEC servers, the CUDU co-located with OLT (CUDU-OLT), AWGs, and all positions of AAU co-located with ONU (AAU-ONU) as shown in Fig. 4 (a), our low-latency oriented WDM-PON based MFWAN planning problem is to find out the optimal configuration. PROPOSED HEURISTIC ALGORITHMS the mathematical model solved by the CPLEX solver can provide the optimal solution for the low-latency oriented network planning problems under certain conditions, it increases time complexity and memory resources for largescale mixed integer linear programming problems [25], [27]. The detailed processes of the proposed LMI-MAPRA and the benchmark algorithm are discussed as follows

PROPOSED ALGORITHM

SIMULATION RESULTS AND ANALYSIS

COMPARISON OF DIFFERENT APPROACHES

CONCLUSION