RELATED APPLICATION

This application is an application under 35 U.S.C. 371 of International Application No. PCT/CN2016/077011 filed on Mar. 22, 2016, the entire contents of which are incorporated herein by reference.

TECHNICAL FIELD

Embodiments of the disclosure relate to the field of wireless communications, and more particularly, to a method for sending uplink control information, a terminal and a base station.

BACKGROUND

Uplink control information (which may also be referred to as uplink control signaling) in a Long Term Evolution (LTE) system mainly includes a Scheduling Request (SR), Channel State Information (CSI), Acknowledgement (ACK)/Negative. Acknowledgement (NACK) information in a Hybrid Automatic Repeat request (HARQ) process and the like. Specifically, the SR is signaling through which a terminal requests a base station for an uplink radio resource. The CSI is information reflecting a channel state between the base station and the terminal. The ACK/NACK information is configured to feed back a receiving condition of data sent by the base station. For example, the terminal receives a Physical Downlink Shared Channel (PDSCH) and demodulates and decodes a Transport Block (TB) born therein. If a decoding result is correct, the terminal may feed back ACK information to the base station. If the decoding result is wrong, the terminal may feed back NACK information to the base station.

Uplink control information may be independently transmitted through a Physical Uplink Control Channel (PUCCH), and may also be transmitted together with uplink data through a Physical Uplink Shared Channel (PUSCH).

A wireless cellular system may use an unlicensed frequency band (for example, 2.4 GHz and 5.8 GHz) to extend a frequency range available for the cellular system. Use of the unlicensed frequency band may be implemented by a License Assisted Access (LAA) technology.

LAA mainly has the following characteristics: (1) a carrier of an unlicensed frequency band is required to be aggregated with a carrier of a licensed frequency band for use, and the carrier of the unlicensed frequency band may serve as an auxiliary carrier only; and (2) the carrier of the unlicensed frequency band may be used only by contention, for example, before data is transmitted on the unlicensed frequency band, a sender is required to perform Listen Before Talk (LBT) detection on the carrier of the unlicensed frequency band and may transmit the data through the carrier only after determining that the carrier is in an idle state.

After detecting that a carrier is idle on an unlicensed frequency band, a base station may transmit data on multiple continuous downlink subframes of the carrier, the multiple continuous downlink subframes are usually called as downlink bursts, and downlink data transmitted on the downlink bursts may be called as downlink burst data. A time resource length occupied by a downlink burst is variable and related to traffic to be transmitted and a maximum single occupation time length predetermined by a protocol. In a conventional art, unlink control information is usually sent on an unlicensed frequency band according to a predetermined period, and there may exist a collision between downlink data sent according to the period and a time resource of downlink burst data sent by a base station. Therefore, there is an urgent need for providing a solution to a time resource collision between uplink control information and downlink data on an unlicensed frequency band.

SUMMARY

The application provides a method for sending uplink control information, a terminal and a base station, so as to provide a solution to a time resource collision between uplink control information and downlink data.

In a first aspect, there is provided a method for sending uplink control information, which may include that: a terminal determines a first time resource, which is configured to transmit uplink control information, on a target carrier according to first indication information sent by a base station; the terminal determines a second time resource, which is configured to transmit downlink data, on the target carrier according to second indication information sent by the base station, wherein the first time resource and the second time resource may be at least partially overlapped; and the terminal determines a third time resource configured to transmit the uplink control information, the third time resource being located after the second time resource and having a preset time interval with the second time resource.

In a second aspect, there is provided a method for sending uplink control information, which may include that: a base station sends first indication information to a terminal, the first indication information indicating a first time resource, which is configured to transmit uplink control information, on a target carrier; the base station sends second indication information to the terminal, the second indication information indicating a second time resource, which is configured to transmit downlink data, on the target carrier, wherein the first time resource and the second time resource may be at least partially overlapped; and the base station determines a third time resource configured to transmit the uplink control information, the third time resource being located after the second time resource and having a preset time interval with the second time resource.

In a third aspect, there is provided a terminal, which may include: a first determination unit configured to determine a first time resource, which is configured to transmit uplink control information, on a target carrier according to first indication information sent by a base station; a second determination unit configured to determine a second time resource, which is configured to transmit downlink data, on the target carrier according to second indication information sent by the base station, wherein the first time resource and the second time resource may be at least partially overlapped; and a third determination unit configured to determine a third time resource configured to transmit the uplink control information, the third time resource being located after the second time resource and having a preset time interval with the second time resource.

In a fourth aspect, there is provided a base station, which may include: a first transceiver unit configured to send first indication information to a terminal, the first indication information indicating a first time resource, which is configured to transmit uplink control information, on a target carrier; a second transceiver unit configured to send second indication information to the terminal, the second indication information indicating a second time resource, which is configured to transmit downlink data, on the target carrier, wherein the first time resource and the second time resource may be at least partially overlapped; and a first determination unit configured to determine a third time resource configured to transmit the uplink control information, the third time resource being located after the second time resource and having a preset time interval with the second time resource.

In a fifth aspect, there is provided a computer-readable medium having stored thereon program codes which are executable by a terminal, the program codes including instructions for executing the method in the first aspect.

In a sixth aspect, there is provided a computer-readable medium having stored thereon program codes which are executable by a base station, the program codes including instructions for executing the method in the second aspect.

In the application, responsive to a condition that there exists a collision between the first time resource (time resource configured to transmit the uplink control information) and the second time resource (time resource sending the downlink data), the terminal re-determines the third time resource configured to transmit the uplink control information, the third time resource being located after the second time resource and having the preset time interval with the second time resource. Such a collision scheme not only ensures one-time sending of the downlink data but also avoids the uplink control information being directly discarded, avoid an unnecessary LB process compared with a solution of sending the downlink data in many times, and may reduce a probability that the uplink control information is discarded compared with a solution of directly discarding the uplink control information.

