Random access method, equipment and system

Abstract

The embodiment of the invention discloses a random access method, equipment and a system. The random access method comprises the steps that: terminal equipment sends a first preamble to access networkequipment; the terminal equipment receives a random access response message sent by the access network equipment, wherein the random access response message comprises backoff indication and parameterinformation; the backoff indication indicates a time value; the parameter information is used for determining the waiting time by the terminal equipment; the terminal determines the waiting time according to the backoff indication or the backoff indication and the parameter information; and the terminal equipment sends a second preamble to the access network equipment after delaying the first time. Thereby, the terminal equipment can initiate random access according to random access priority requirements; and thus, low-delay requirements are satisfied.

Description

technical field [0001] The present invention relates to the field of communication technology, in particular to a random access method, device and system. Background technique [0002] In the fourth generation (4th Generation, 4G) mobile communication, the terminal device and the access network device need to perform data transmission while maintaining synchronization, thereby ensuring the accuracy of data transmission. A random access (Random Access, RA) process is an important way for a terminal device to maintain synchronization with an access network device. Taking a Long Term Evolution (LTE) system as an example, there are two different random access methods: non-contention based random access and contention based random access. [0003] In the initial stage of the random access process, the terminal device will send a preamble (preamble) to the access network device. One function of the preamble sent by the terminal device is to enable the access network device to es...

AI Technical Summary

Problems solved by technology

However, in the existing random access process, the terminal device randomly determines the waiting time according to the backoff instruction sent by the access network device. This method cannot guarantee that the waiting time of the URLLC service is short and can priority access

Therefore, the existing random access process cannot meet the requirements of 5G mobile communication services, especially the low-latency requirements of URLLC services

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