Uplink control information transmission method, terminal and base station under carrier aggregation

Abstract

The invention discloses an uplink control information transmission method, terminal and base station under carrier aggregation. The method includes receiving a first reconfiguration message used for establishing connection and sent by the base station and receiving a second reconfiguration message used for adding auxiliary a carrier wave and sent by receiving the base station; determining whetherto report CQI / RI (Channel Quality Indicator / Rank Indication) periodically according to the first report configuration message and the second report configuration message and calculating a sub frame used for reporting CQI / RI on a main carrier wave or the auxiliary carrier wave; calculating UCI (Uplink Control Information) information used for transmitting content including CQI / RI according to a judgment result after activating a first cell and a second cell as the main carrier wave and the auxiliary carrier wave in the base station and calculating carrier waves of the channel; sending UCI information to the base station according to the sub frame, the channel and the carrier wave obtained through calculation. According to the invention, calculation is performed based on CQI / RI configurationof the main carrier wave and the auxiliary carrier wave, so that UCI transmission on the carrier waves can be performed in proper time and in proper channels by adopting the technical scheme. UCI transmission failure can be avoided effectively and timely UCI transmission can be ensured.

Description

technical field [0001] The present invention relates to the technical field of wireless communication, in particular to a method for transmitting uplink control information under carrier aggregation, a terminal and a base station. Background technique [0002] In order to meet the peak rate requirements, LTE-A (the subsequent evolution of the long-term evolution) technology currently supports a maximum bandwidth of 100MHz, but it is difficult to find such a large bandwidth in the existing available spectrum resources, and the large bandwidth is very difficult for the hardware design of the base station and terminal bring great difficulty. In addition, for spectrum resources scattered in multiple frequency bands, a technology is urgently needed to make full use of them. Based on the above considerations, LTE-A introduces the key technology of CA (Carrier Aggregation). [0003] In the carrier aggregation technology, the reporting of UCI (uplink control information) is a very...

AI Technical Summary

Problems solved by technology

[0003] In the carrier aggregation technology, the reporting of UCI (uplink control information) is a very important part. Whether the UE (terminal) can transmit UCI accurately and effectively plays a role in the real-time adjustment of AMC (adaptive modulation and coding technology) on the network side. The role of determinism is directly related to whether the maximum throughput of the system can be obtained under the current network; if the UCI information cannot be fed back in a timely and reasonable manner, it will have a serious impact on the system capacity and network resource allocation. If the network The side has not received the report of the CQI (Channel Quality Indication) message in the UCI for a period of time, and then the network side will adopt conservative scheduling to reduce the MCS (modulation and coding strategy) and resource allocation; If ACK / NAK (positive acknowledgment / negative acknowledgment) is fed back to the network side on frequency resources, it is easy to cause DTX (discontinuous transmission) or HARQ Fail (hybrid automatic retransmission request), so that the system capacity will be significantly reduced and cannot reach Purpose of Carrier Aggregation

Images