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A random access method and communication device

A technology of random access and communication equipment, applied in the field of communication, can solve the problem of prolonging the random access time and achieve the effect of reducing the random access time

Active Publication Date: 2022-07-12
CHINA MOBILE COMM LTD RES INST +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0014] Embodiments of the present invention provide a random access method and communication equipment to solve the problem that when the random access response window setting scheme is used in the unlicensed spectrum, if the communication equipment cannot detect the physical downlink control channel in the RAR window, it will Re-compete for new channel access opportunities, prolonging the random access time

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  • A random access method and communication device
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  • A random access method and communication device

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Embodiment Construction

[0046] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0047] see figure 1 , figure 1 is a flowchart of a random access method provided by an embodiment of the present invention, which is applied to the first communication device, such as figure 1 As shown, the method includes the following steps:

[0048]Step 101: Send a random access preamble signal.

[0049] A random access preamble (Random Access Preamble, RAP for short) (the random access preamble is also sometimes referred to as a PRACH...

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Abstract

The present invention provides a random access method and communication device. The random access method includes: sending a random access preamble signal; listening to a random access response message before a random access response window times out, wherein the random access The update of the response window is related to the channel access information of the second communication device. The first communication device determines whether the second communication device competes for a channel access opportunity according to whether the channel access information is detected. In this way, when the second communication device fails to compete for the channel access opportunity, the first communication device will not determine that this random access procedure fails, and re-initiate the random access procedure. Since the first communication device needs to backoff for a period of time before initiating a new random access procedure, the present invention can reduce the random access time of the first communication device.

Description

technical field [0001] The present invention relates to the field of communication technologies, and in particular, to a random access method and a communication device. Background technique [0002] In the 3rd Generation Partnership Project (3GPP) Rel-15, the research topic of New Radio (New Radio, NR for short) unlicensed spectrum (NR unlicensed, NR-U for short) is started. [0003] The random access procedure on licensed spectrum in 3GPP Rel-15 includes: [0004] At time t1, a user equipment (User Equipment, UE for short) sends a physical random access channel (Physical Random Access Channel, PRACH for short) (ie Msg1); [0005] At time t1+△t, the UE starts the RAR window, and the UE listens to the Physical Downlink Control Channel (PDCCH) in the random access response (RAR) window to determine whether the base station has sent a specific DCI format (ie Msg2), where Δt is a pre-configured parameter, which is related to the capability of the base station or terminal. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04W74/08H04L5/00
CPCH04W74/0833H04L5/0048Y02D30/70
Inventor 柯颋邵华刘建军童辉王启星刘光毅
Owner CHINA MOBILE COMM LTD RES INST