A data transmission method, terminal equipment and access network equipment

Abstract

A data transmission method, terminal device, access network device, and system, the method comprising: the access network device sends first control information to the terminal device at a first time unit of a first carrier; the access network device transmits first control information according to The first time unit, the first parameter, and the first duration determine a second time unit of the second carrier, and the time length of the first time unit is different from the time length of the second time unit; the access network The device performs data transmission with the terminal device on the second time unit of the second carrier. Thus, the access network device and the terminal device can complete the transmission of control information and data when the time unit lengths of the first carrier and the second carrier are different, which improves the flexibility of cross-carrier scheduling.

Description

technical field [0001] The embodiments of the present application relate to a communication system, and in particular to a data transmission method, a terminal device and an access network device. Background technique [0002] In a frequency division duplex (Frequency Division Duplex, FDD) system, cross-carrier scheduling is a technique for transmitting control information and data on different carriers. Taking uplink data transmission as an example, the access network device sends control information to the terminal device at the first time unit n (for example, subframe n) of the scheduled carrier, and the terminal device will transmit control information at the second time unit n (for example, subframe n) of the scheduled carrier according to the control information. Send data on unit n+k (subframe n+k), where the parameter k can be a preset parameter or sent by the access network device and carried in the control information, and the time unit length of the scheduled carr...

AI Technical Summary

Problems solved by technology

Taking uplink data transmission as an example, the access network device sends control information to the terminal device at the first time unit n (for example, subframe n) of the scheduled carrier, and the terminal device will transmit control information at the second time unit n (for example, subframe n) of the scheduled carrier according to this control information. Send data on unit n+k (subframe n+k), where the parameter k can be a preset parameter or sent by the access network device and carried in the control information, the time unit length of the scheduled carrier is the same as the scheduled carrier The length of the time unit is the same, that is, the scheduling carrier and the scheduled carrier have the same granularity in the time domain. Therefore, according to the method of the prior art, the control information is sent on the first time unit n of the scheduling carrier, and the data will be in Send on the second time unit n+k of the scheduled carrier, but when the length of the time unit of the scheduled carrier and the scheduled carrier is different, that is, when the granularity of the scheduled carrier and the scheduled carrier is different in the time domain, the access network device or The terminal device cannot determine the specific location of the second time unit n+k of the scheduled carrier to send data, resulting in the failure to send data

When the time unit length of the scheduling carrier is different from that of the scheduled carrier, the existing cross-carrier scheduling will not work

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