Multi-Tenant C-RAN with Spectrum Pooling: Downlink Optimization under Privacy Constraints

Seok Hwan Park, Osvaldo Simeone, Shlomo Shamai

Research output: Contribution to journalArticlepeer-review

11 Scopus citations

Abstract

Spectrum pooling allows multiple operators, or tenants, to share the same frequency bands. This paper studies the optimization of spectrum pooling for the downlink of a multi-Tenant cloud radio access network system in the presence of inter-Tenant privacy constraints. The spectrum available for downlink transmission is partitioned into private and shared subbands, and the participating operators cooperate to serve the user equipment (UEs) on the shared subband. The network of each operator consists of a cloud processor (CP) that is connected to proprietary radio units (RUs) by means of finite-capacity fronthaul links. In order to enable inter-operator cooperation, the CPs of the participating operators are also connected by finite-capacity backhaul links. Inter-operator cooperation may, hence, result in loss of privacy. Fronthaul and backhaul links are used to transfer quantized baseband signals. Standard quantization is considered first. Then, a novel approach based on the idea of correlating quantization noise signals across RUs of different operators is proposed to control the trade-off between distortion at UEs and inter-operator privacy. The problem of optimizing the bandwidth allocation, precoding, and fronthaul/backhaul compression strategies is tackled under constraints on backhaul and fronthaul capacity, as well as on per-RU transmit power and inter-operator privacy. For both cases, the optimization problems are tackled using the concave convex procedure, and extensive numerical results are provided.

Original languageEnglish (US)
Article number8437192
Pages (from-to)10492-10503
Number of pages12
JournalIEEE Transactions on Vehicular Technology
Volume67
Issue number11
DOIs
StatePublished - Nov 2018
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Automotive Engineering
  • Aerospace Engineering
  • Electrical and Electronic Engineering
  • Applied Mathematics

Keywords

  • C-RAN
  • RAN sharing
  • fronthaul compression
  • multi-Tenant
  • multivariate compression
  • precoding
  • privacy constraint
  • spectrum pooling

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