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Random access method and device

A random access and message technology, applied in the field of communications, can solve the problem of large random access delay in satellite communication systems, and achieve the effect of reducing random access delay and reducing delay overhead.

Pending Publication Date: 2021-12-31
DATANG MOBILE COMM EQUIP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The present invention provides a random access method and device to solve the problem of large random access delay in satellite communication systems

Method used

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  • Random access method and device
  • Random access method and device
  • Random access method and device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0350] Such as Figure 5 As shown, the present invention provides a random access system, including:

[0351] The base station 501 to which the satellite cell belongs is used to determine the terrestrial cell accessed by the UE; through the terrestrial cell, send a random access related message to the UE and indicate that the cell type corresponding to the random access related message is a satellite cell ;

[0352]The base station 502 to which the terrestrial cell belongs is used to receive the random access related message for the user terminal UE sent by the satellite cell; send the random access related message to the UE, and indicate the cell corresponding to the random access related message The type is a satellite cell;

[0353] The user terminal UE503 is configured to receive a random access related message sent by a terrestrial cell; determine a cell type corresponding to the random access related message, and the cell type is a terrestrial cell or a satellite cell....

Embodiment approach

[0378] 1.1) Contention-based four-step random access process

[0379] The indication information added in the above random access message includes the medium access control MAC subheader in the medium access control protocol unit RAR MAC PDU corresponding to the second message Msg2 of the contention-based four-step random access, or RARMAC PDU The indication information added in the payload part of the contention-based four-step random access, and / or the indication information added in the fourth message Msg 4 of the contention-based four-step random access.

[0380] The specific instruction information can be but not limited to one or a combination of the following:

[0381] Cell group identifier of the cell group targeted by Msg2 / Msg4;

[0382] The TAG (Timing Advanced Group, timing advance group) number targeted by Msg2 / Msg4;

[0383] The cell and / or frequency point identification targeted by Msg2 / Msg4;

[0384] The cell type identifier for Msg2 / Msg4, the cell type inclu...

Embodiment approach 1

[0421] In this embodiment, the CBRA-based four-step random access process on the satellite cell is realized through the ground cell.

[0422] It is assumed that the ground cell is used as MCG (Master Cell Group, primary cell group), the satellite cell is used as SCG (Secondary Cell group, secondary cell group), and the random access process is a four-step random access based on CBRA. This process is also applicable to the case where the ground cell serves as the SCG and the satellite cell serves as the MCG.

[0423] MCG and SCG are concepts under dual connectivity (DC, Dual Connectivity). Dual connectivity means that a terminal can access multiple base stations at the same time.

[0424] In this embodiment, the main purposes of the random access procedure of the UE on the satellite cell SCG include but are not limited to: 1) Obtaining the uplink synchronization of the UE on the satellite cell; 2) Acquiring the uplink resource of the UE on the satellite cell.

[0425] Such as ...

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Abstract

The invention discloses a random access method and device, and the method comprises the steps that: in a random access process, a base station to which a satellite cell belongs sends a random access related message through a ground cell accessed by UE, and indicates a cell type corresponding to the random access related message, and the UE receives the random access related message sent by the ground cell; and a cell type corresponding to the random access related message is determined, wherein the cell type is a ground cell or a satellite cell. The invention provides the method for assisting the satellite cell to perform random access by the ground cell, the random access time delay of the satellite communication system can be shortened through the method, and the time delay overhead is reduced.

Description

technical field [0001] The present invention relates to the field of communication technology, in particular to a random access method and device. Background technique [0002] In the future mobile communication system, a possible networking method is space-ground integrated networking, that is, a complete network is composed of a satellite communication system and a ground communication system. Compared with the terrestrial communication system, the satellite communication system is typically characterized by a very large transmission delay. [0003] The 5G random access process is divided into two categories: four-step random access with Msg1 and two-step random access with MsgA. Both types of random access support contention-based random access (Contention-based Random Access, CBRA) and non-contention-free random access (Contention-free Random Access, CFRA). [0004] In the CBRA method, different user terminals (User Equipment, UE) can use the same random access resourc...

Claims

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Application Information

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IPC IPC(8): H04W74/08H04W84/06H04B7/185
CPCH04W74/0833H04W84/06H04B7/18513H04B7/18519H04W56/0045H04B7/1851H04B7/1853H04W48/20H04W76/11H04W74/002H04W74/0841
Inventor 赵亚利
Owner DATANG MOBILE COMM EQUIP CO LTD
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