期刊
IEEE TRANSACTIONS ON SIGNAL AND INFORMATION PROCESSING OVER NETWORKS
卷 7, 期 -, 页码 259-274出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TSIPN.2021.3070712
关键词
Task analysis; Uplink; Collaboration; Computer architecture; Downlink; Optimization; Edge computing; Mobile cloud computing; edge computing; C-RAN; constrained fronthaul; end-to-end latency minimization; (matrix) fractional programming
资金
- European Research Council (ERC) under the European Union [694630, 725731]
- Basic Science Research Program through the National Research Foundation of Korea (NRF) - Ministry of Education [NRF-2019R1A6A1A09031717, 2021R1C1C1006557]
- MSIT (Ministry of Science, and ICT), Korea, under the ITRC (Information Technology Research Center) support program [IITP-2020-0-01787]
- National Research Foundation of Korea [2021R1C1C1006557] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
This paper proposes an approach to collaboratively offload computing tasks across CP and ENs within a Cloud RAN architecture, minimizing end-to-end latency by exchanging data and computational outcomes.
Mobile cloud and edge computing protocols make it possible to offer computationally heavy applications to mobile devices via computational offloading from devices to nearby edge servers or more powerful, but remote, cloud servers. Previous work assumed that computational tasks can be fractionally offloaded at both cloud processor (CP) and at a local edge node (EN) within a conventional Distributed Radio Access Network (D-RAN) that relies on non-cooperative ENs equipped with one-way uplink fronthaul connection to the cloud. In this paper, we propose to integrate collaborative fractional computing across CP and ENs within a Cloud RAN (C-RAN) architecture with finite-capacity two-way fronthaul links. Accordingly, tasks offloaded by a mobile device can be partially carried out at an EN and the CP, with multiple ENs communicating with a common CP to exchange data and computational outcomes while allowing for centralized precoding and decoding. Unlike prior work, we investigate joint optimization of computing and communication resources, including wireless and fronthaul segments, to minimize the end-to-end latency by accounting for a two-way uplink and downlink transmission. The problem is tackled by using fractional programming (FP) and matrix FP. Extensive numerical results validate the performance gain of the proposed architecture as compared to the previously studied D-RAN solution.
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