Coordinated resource allocation in centralized radio access networks with dynamic downlink/uplink reconfiguration

Abstract

We propose and evaluate a novel coordinated resource allocation scheme in Time Division Duplex (TDD) systems where the downlink/uplink (DL/UL) resources are allocated dynamically for asymmetric traffic adaptation. To eliminate the cross-subframe co-channel interference (CCI), we first formulate the dynamic reconfiguration problem as the cooperative control that operates on disjoint cell clusters. With this setup, the DL/UL configurations are no longer determined with respect to an individual cell, but are chosen in form of the cluster-specific configuration patterns (CPs) with optimized performance metrics. Additionally, a novel CCI cancelation (CCIC) method, termed cross-subframe coordinated scheduling/beamforming (CCS/CCB) is incorporated in the proposed reconfiguration approach. By jointly designing and optimizing the beamforming vectors and the traffic scheduling, the residual intra-cluster CCI can be mitigated.