High-speed single-frequency network for HSDPA

This paper introduces a multi-cell transmission scheme for High-Speed Downlink Packet Access (HSDPA) networks, called High-Speed Single-Frequency Network (HS-SFN). While existing multi-point transmission features for WCDMA have concentrated on soft/softer handover (HO) mechanisms and are applicable only for Rel-99 based networks, HS-SFN brings an over-the-air combining approach to multi-cell transmissions for packet-oriented HSDPA. We introduce also a so-called ”High-Speed Data-Discontinuous Transmission (HS-DDTx)” concept, an inter-cell interference mitigation scheme designed to improve the data throughput especially for low geometry users residing at cell borders. The presented results show how these low complexity concepts together offer a high gain for low and medium throughput users, without sacrificing the overall network performance. The proposed schemes also allow further upgradeability and there are ways to improve the efficiency by enhancements on both network side and user terminal equipment.