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Non-contention random access method and device

A random access and random access message technology, applied in the field of communication, can solve the problems of waste of physical resources, time extension, UE link disconnection, etc., and achieve the effect of solving link disconnection, saving synchronization delay, and solving RRC reconstruction problems

Active Publication Date: 2019-01-01
CHENGDU TD TECH LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Therefore, in the prior art, when the UE does not receive the PDCCH ORDER, if the period of the timer is too large, that is, the delay in sending the PDCCH ORDER to the UE again is too long, which may cause the UE to fail. On the other hand, if the period of the timer is too small, it is very likely that a new random access process is started when the random access process initiated by the current PDCCH ORDER has not ended, so that multiple random access The process is carried out at the same time, resulting in a waste of physical resources, and may cause the UE to initiate RRC connection re-establishment

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Embodiment Construction

[0037] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments It is a part of embodiments of the present invention, but not all embodiments. 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.

[0038] The random access process in the prior art is as follows:

[0039] 1) The eNodeB sends a PDCCH ORDER to the UE in the nth subframe, authorizes a part of PREMBLE resources to the UE and triggers the UE to initiate a random access procedure.

[0040] 2) After receiving the PDCCH ORDER, the UE sends a first random access message (MSG1) to the...

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Abstract

Embodiments of the invention provide a non-competitive random access method and device. In the non-competitive random access method of the invention, an eNodeB (Evolved Node B) sets different timers according to the states of different stages of non-competitive random access, so that the synchronization time delay of UE (User Equipment) is considered, the physical resources are saved, and the problems of chain falling of the UE and RRC (Radio Resource Control) reconstruction can be completely solved.

Description

technical field [0001] Embodiments of the present invention relate to communication technologies, and in particular to a non-contention random access method and device. Background technique [0002] When a user equipment (User Equipment, UE for short) is in a switching band or channel fading is very large, the UE may lose synchronization. When the UE loses synchronization, the evolved base station (Evolved Node B, referred to as eNodeB) sends a physical downlink control channel (Physical Downlink Control Channel, referred to as PDCCH) order (ORDER) to the UE, so that the UE initiates a non-contention random access, thereby synchronizing the UE with the eNodeB. [0003] In the prior art, the eNodeB controls the sending of the PDCCH ORDER by setting the period of the timer and the maximum number of sending times of the PDCCH ORDER. Specifically, the eNodeB starts the timer after sending the PDCCH ORDER. If the MSG3 sent by the UE is correctly decoded, after the timeout, the ...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04W74/08
Inventor 魏立梅李文情朱玉梅赵连鹏袁乃华范晨
Owner CHENGDU TD TECH LTD