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Random access method and communication equipment

A technology of random access and communication equipment, applied in the field of communication, can solve problems such as prolongation of random access time

Active Publication Date: 2020-10-09
CHINA MOBILE COMM LTD RES INST +1
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  • 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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  • Random access method and communication equipment

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Embodiment Construction

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

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

[0048]Step 101, sending a random access preamble signal.

[0049] A random access preamble (Random Access Preamble, RAP for short) (a random access preamble is sometimes called a PRACH preamble) may be regard...

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Abstract

The invention provides a random access method and communication equipment. The random access method comprises the following steps that a random access preamble signal is sent; a random access response message is monitored before a random access response window is overtime, and update of the random access response window is related to the channel access information of a second communication device; and a first communication device determines whether the second communication device competes for the channel access opportunity according to whether the channel access information is monitored. Thus, the first communication device does not confirm that the random access process is failed and reinitiates the random access process under the condition that the second communication device does not compete for the channel access opportunity. Since the first communication device can initiate the new random access process only after a period of backoff, and the random access time of the first communication device can be reduced.

Description

technical field [0001] The present invention relates to the technical field of communication, in particular to a random access method and communication equipment. Background technique [0002] In the 3rd Generation Partnership Project (3rd Generation Partnership Project, 3GPP for short) Rel-15, a new radio interface (New Radio, NR for short) unlicensed spectrum (NR unlicensed, NR-U for short) research topic was launched. [0003] The random access process on the licensed spectrum in 3GPP Rel-15 includes: [0004] At time t1, the user equipment (User Equipment, referred to as UE) sends a Physical Random Access Channel (Physical Random Access Channel, referred to as PRACH) (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 (random access response, RAR) window to determine whether the base station has sent a specific DCI format (that is, Msg2), wherein, Δt is a pre-...

Claims

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Application Information

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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