A method and device for data transmission

Abstract

This embodiment provides a data transmission method and device, which can be applied to communication systems, such as V2X, LTE‑V, V2V, Internet of Vehicles, MTC, IoT, LTE‑M, M2M, Internet of Things, etc. The method includes: the terminal equipment sends the first data packet through the GUL transmission mode in the first time unit, the first data packet corresponds to the first HARQ process number, and the first data packet corresponds to the first new data indication information; the terminal equipment receives First indication information, where the first indication information is used to instruct the terminal device to send a second data packet in a second time unit, where the second data packet corresponds to the first HARQ process number, where the second data packet corresponds to the The second new data indication information sent by the network device; the terminal device caches the first data packet according to the value of the first new data indication information and the value of the second new data indication information, or sends the second packet. Therefore, the problem of data packet loss can be reduced, and the reliability of data transmission can be improved.

Description

technical field [0001] The embodiments of the present invention relate to the communication field, and more specifically, to a data transmission method and device. Background technique [0002] At present, there is a known scheduling-free Grant free Uplink (GUL) transmission mechanism, or called an autonomous uplink (Autonomous UL, AUL) transmission mechanism, in which network devices allocate GUL resources to terminal devices, and the terminal devices When performing uplink transmission, there is no need to send a scheduling request (Scheduling Request, SR) to the network device and wait for the network device to send an uplink grant (Up Link Grant, UL Grant) information, and can directly perform uplink transmission through GUL transmission resources, thereby reducing transmission time. delay. [0003] In the prior art, when performing uplink transmission through the GUL transmission mechanism, the terminal device autonomously selects Hybrid Automatic Repeat Request (HARQ)...

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Problems solved by technology

[0004] However, in the prior art, if the blind detection of the uplink control information by the network device fails, the network device does not know that the terminal device uses the HARQ process to transmit the first data, and thus cannot receive the first data correctly; At the same time, the network device schedules the terminal device to use the HARQ process for initial transmission through the uplink authorization UL grant information in a later period (that is, instructs the terminal device to send second data different from the first data), and the terminal device receives the UL grant After information, it will be considered that the first data sent by using the HARQ process has been correctly received by the network device, then the terminal device will no longer send the first data, but send the second data on the HARQ process according to the UL grant information , resulting in the loss of the first data, seriously affecting the reliability of data transmission

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