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A random access initialization method and device

An initialization method and random access technology, applied in wireless communication, network traffic/resource management, electrical components, etc., can solve the problems of low RACH selection opportunity and high random access signaling overhead, and achieve saving signaling overhead, Optimize the selection scheme and improve the effect of transmission efficiency

Active Publication Date: 2022-05-24
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

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  • A random access initialization method and device
  • A random access initialization method and device
  • A random access initialization method and device

Examples

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no. 1 example

[0039] figure 1 It is a flow chart 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, determine whether a non-contention random access (CFRA) resource is configured according to the event that triggers the RACH: if a CFRA resource is configured, determine whether there is a candidate SSB associated with RO (PRACH Occasion, random access opportunity) in the CFRA resource. (SS / PBSCH, synchronization block) / CSI-RS (Channel State Information-Reference Signal, channel information reference signal) The measured RSRP is higher than the set threshold, if there is, select the SSB / CSI-RS higher than the set threshold The corresponding RO and preamble ID initiates RACH; if non-contention random access resources are not configured, or non-contention random access...

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 the selection of the two-step random access channel include: satisfying the second condition or the third condition under the condition that the first condition is not met.

[0049] The first case is that a non-contention random access resource under a dedicated four-step random access channel (4-step RACH) is provided and the resource satisfies the first setting condition; the second case is that a four-step random access resource is provided. The random access resource and the two-step random access channel (2-step RACH) resource under the access channel, and the two-step random access channel resource satisfies the second setting cond...

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 steps 102:

[0090] Step 102: If the random access process is re-initiated, first determine the random access type, and then select the corresponding random access channel resource to re-initiate the random access channel.

[0091] In step 102, when the terminal RACH fails to initiate 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 selected to re-initiate the RACH.

[0092] Step 102 can be applied or only applied when selecting 4-step RACH to initiate random access failure, if the RACH is re-initiated, first select the RACH type according to the RACH type selection method in the RACH initialization, and then select the RACH resource corresponding to the RACH type. Re-initi...

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Abstract

The present application discloses a random access initialization method and device. The method includes at least one of the following steps: determining the conditions of the two-step random access channel selected for initialization of the random access process; if the random access process is reinitiated, first Determine the type of random access, and then select the corresponding random access channel resource to re-initiate the random access channel; the conditions for initializing the selection of the two-step random access channel include: satisfying the second or third condition without satisfying the first condition ; The first case is that CFRA under dedicated 4-stepRACH is configured and the resource meets the first set condition; the second case is configured with 4-stepRACH resource and 2-stepRACH resource, and the 2-stepRACH resource satisfies the second set condition Conditions; the third case is that only two-step random access channel resources are allocated. The device uses the method. The application solves the problems of low RACH selection opportunities and large random access signaling overhead, and is especially suitable for RACH technology in mobile communication systems.

Description

technical field [0001] The present application relates to the field of mobile communication technologies, and in particular, to a random access initialization method and device. Background technique [0002] The existing system supports two types of random access, namely four-step random access (4-step RACH) and two-step random access (2-step RACH). In the two types of random access systems, after the terminal determines the RACH type in the initial random access, except that the 2-step RACH can fall back to the 4-step RACH under certain conditions, if the 4-step RACH is initially selected, it will always be used. 4-step RACH initiates random access, and 2-step RACH cannot be selected, which limits the effective use of 2-step RACH to a certain extent. Compared with 4-step RACH, -step RACH reduces access delay and saves signaling. Performance advantages in terms of reducing system transmission efficiency. SUMMARY OF THE INVENTION [0003] The present application proposes ...

Claims

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Application Information

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Patent Type & Authority Patents(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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