Performance Evaluation of Downlink LTE-Advanced Type 1 Relay Network

概要

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3GPP LTE-Advanced has been considering relaying technologies to enhance LTE capacity, especially Type 1 relay node (RN), which is a non-transparent relay. The Type 1 RN has backhaul and access links connecting to a base station (eNodeB (eNB)) and user equipment (UE), respectively. The two links use the same carrier frequency as the access link between eNB and UE, and are time-multiplexed to avoid self-interference at the RN. In the downlink, due to the requirement of time-multiplexing backhaul and access links at the RN, the allocation of backhaul link resource creates trade-off between the throughputs of UEs connecting with the eNB and RN. Therefore, in order to maximize system capacity, the optimization of backhaul resource allocation is necessary. Also, when the RN and eNB independently schedule the same resources for data transmissions, they cause interferences to the UE. Since the amount of interference depends on the RN positions, the system capacity also varies. This paper aims to quantitatively clarify these issues by using system level simulations.
2011-02-23