Method and system for transmitting downlink control information

摘要

The present disclosure discloses a method and system for transmitting downlink control information, for solving the problem of how to indicate a transmission scheme when a cyclic redundancy check code in the downlink control channel is scrambled with the semi-persistently scheduled cell radio network temporary identifier. In order to support the bi-flow beam forming technology in the LTE-A R9, the present disclosure provides a downlink control information Format 1A, which may, when the cyclic redundancy check code in the downlink control channel is scrambled with the semi-persistently scheduled cell radio network temporary identifier, indicates a method for transmitting downlink control information, for example, single-layer transmission, transmit diversity, or a transmission scheme simultaneously involving single-layer transmission and transmit diversity, which guarantees flexibility of system schedule. The present disclosure adds no signaling overhead and has good adaptability with the LTE R8.

主权项

1. A method for transmitting Downlink Control Information (DCI), comprising: when a cyclic redundancy check code in a downlink control channel is scrambled with a Semi-Persistently Scheduled Cell Radio Network Temporary Identifier (SPS C-RNTI),
generating DCI by a base station according to DCI Format 1A of a transmission mode with antenna ports 7 and 8, wherein the DCI Format 1A is used for indicating a transmission scheme of corresponding Physical Downlink Shared Channel (PDSCH) as indicated by the DCI; receiving, by a user equipment, the DCI and acquiring the DCI according to the DCI Format 1A; wherein the transmission scheme supported by the DCI Format 1A is only a single-layer transmission scheme, or only a transmit diversity transmission scheme, or a transmission scheme involving both a single-layer transmission and transmit diversity; wherein the single-layer transmission scheme is a single-antenna-port transmission scheme; when the transmission scheme supported by the DCI Format 1A is only the single-antenna-port transmission scheme and a single-antenna port is a fixed antenna port, the fixed antenna port is the antenna port 7; and when the transmission scheme supported by the DCI Format 1A is only the single-antenna-port transmission scheme and the single-antenna port is a signaling indicated antenna port, the DCI Format 1A comprises indication signaling for indicating the single-antenna port, and the indication signaling comprises: Hybrid Automatic Repeat Request (HARQ) process number signaling bits, or a New Data Indicator (NDI) signaling bit, or Redundant Version (RV) signaling bits.