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Random access initialization method and equipment

An initialization method and random access technology, applied in network traffic/resource management, electrical components, wireless communication, etc., can solve the problems of low RACH selection opportunities and high random access signaling overhead, so as to save signaling overhead, The effect of optimizing the selection scheme and improving the transmission efficiency

Active Publication Date: 2021-04-30
CHINA ACADEMY OF INFORMATION & COMM
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] This application proposes a random access initialization method and device, which solves the problems of low chance of two-step RACH selection and high random access signaling overhead in the existing method and device, and is especially suitable for RACH (Random Access Channel, Random Access Channel) in mobile communication systems. in-channel) technology

Method used

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  • Random access initialization method and equipment
  • Random access initialization method and equipment
  • Random access initialization method and equipment

Examples

Experimental program
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no. 1 example

[0039] figure 1 It is a flowchart of an embodiment of the prior art.

[0040] After initializing and determining the random access type, it is necessary to select the corresponding random access resource under the random access type. The general steps of selection are as follows: figure 1 shown.

[0041] First, judge whether non-competition random access (CFRA) resources are configured according to the event triggering RACH: if CFRA resources are configured, then judge whether there is a candidate SSB associated with RO (PRACHOccasion, random access opportunity) in CFRA resources ( SS / PBSCH, synchronization block) / CSI-RS (ChannelStateInformation-Reference Signal, channel information reference signal) corresponding to the measured RSRP is higher than the set threshold, if it exists, select the RO corresponding to the SSB / CSI-RS higher than the set threshold Initiate RACH with the preamble ID; if no non-competition random access resources are configured, or non-competition ra...

no. 2 example

[0046] This embodiment provides a random access initialization method of the present invention, which specifically includes the following steps 101:

[0047] Step 101. Determine the conditions for selecting a two-step random access channel during initialization of the random access process.

[0048] In step 101, the conditions for initializing and selecting a two-step random access channel include: satisfying the second condition or the third condition when the first condition is not satisfied.

[0049] The first case is that a non-contention random access resource under a dedicated four-step random access channel (4-stepRACH) is configured and the resource satisfies the first setting condition; the second case is that a four-step random access channel is configured. The random access resource and the two-step random access channel (2-stepRACH) resource under the input channel, and the two-step random access channel resource meets the second setting condition; the third case i...

no. 3 example

[0089] The embodiment of the present invention provides a random access initialization method of the present invention, which specifically includes the following step 102:

[0090] Step 102. If the random access process is reinitiated, first determine the random access type, and then select the corresponding random access channel resource to reinitiate the random access channel.

[0091] In step 102, when the terminal RACH initiates access failure, if the RACH is re-initiated, the RACH type selection is performed according to the RACH type selection method in the RACH initialization, and then the RACH resource corresponding to the RACH type is selected to re-initiate the RACH.

[0092] Step 102 can be applied or only applied when the selection of 4-stepRACH fails to initiate random access. If the RACH is re-initiated, the RACH type is selected according to the RACH type selection method in the RACH initialization, and then the RACH resource corresponding to the RACH type is sel...

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Abstract

The invention discloses a random access initialization method and random access initialization equipment. The method at least comprises the following steps of determining a condition of a two-step random access channel initialized and selected in a random access process; if the random access process is initiated again, the random access type is judged firstly, and then the corresponding random access channel resource is selected to initiate the random access channel again; wherein the condition of initializing and selecting the two-step random access channel comprises that a second condition or a third condition is met under the condition that the first condition is not met; wherein the first condition is that the CFRA under the special 4stepRACH is configured and the resource meets a first set condition; wherein the second condition is that the resource of the 4step RACH and the resource of the 2step RACH are configured, and the resource of the 2step RACH meets a second set condition; wherein the third condition is that only two steps of random access channel resources are configured. The apparatus uses the method. According to the invention, the problems of low RACH selection opportunity and large random access signaling overhead are solved, and the method is especially suitable for the RACH technology of a mobile communication system.

Description

technical field [0001] The present application relates to the technical field of mobile communication, and in particular to a random access initialization method and device. Background technique [0002] The existing system supports two types of random access, which are four-step random access (4-stepRACH) and two-step random access (2-stepRACH). According to the agreement in the existing protocol 38.321, two types of In the type random access system, after the terminal determines the RACH type in the initial random access, except that 2-stepRACH can fall back to 4-stepRACH under certain conditions, if 4-stepRACH is initially selected, it will always use 4-stepRACH to initiate random access. For access, 2-stepRACH cannot be selected, which limits the effective use of 2-stepRACH to a certain extent, and does not take advantage of the performance advantages of 4-stepRACH in reducing access delay and saving signaling compared with 4-stepRACH, reducing system transmission effici...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W74/08H04W28/20
CPCH04W74/0833H04W28/20
Inventor 王志勤沈霞杜滢闫志宇焦慧颖刘晓峰魏贵明徐菲
Owner CHINA ACADEMY OF INFORMATION & COMM
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