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Random access method and user equipment

A technology of random access and user equipment, applied in the field of communication, can solve the problem that the relevant steps cannot be carried out normally, and achieve the effect of improving the success rate

Active Publication Date: 2019-01-25
ZTE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0018] The main purpose of the present invention is to provide a random access method and user equipment, so as to at least solve the problem that the SCell may be in a deactivated state due to the fact that the UE has not transmitted and received data for a long period of time, so that the random access process on the SCell may be related Problems with steps not working properly

Method used

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  • Random access method and user equipment

Examples

Experimental program
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Effect test

Embodiment 1

[0067] The scenario of this embodiment is: the PCell of the UE is in the uplink synchronization state; the SCell1 and the SCell2 are in the uplink out-of-sync state and both are deactivated; the UE uplink data arrives. Figure 4 is a flow chart of the random access process according to Embodiment 1 of the present invention, as shown in Figure 4 shown, including the following steps:

[0068] Step S402, the UE activates at least one of SCell1 and SCell2, taking only SCell1 as an example; or when the UE judges that its BSR value is greater than the preconfigured threshold x, activate SCell1; or when the UE judges that its PHR value is greater than the preconfigured threshold y, Activate the SCell1; or when the UE judges that the value of its BSR is greater than the preconfigured threshold x and the value of its PHR is greater than the preconfigured threshold y, activate the SCell1.

[0069] Or the UE sends a BSR on the PCell, and waits for the eNB to send a MAC CE on the PCell ...

Embodiment 2

[0073] The scenario of this embodiment is: the PCell of the UE is in the uplink synchronization state; the SCell1 and the SCell2 are in the uplink out-of-sync state, and both are deactivated; the downlink data for the UE arrives in the eNB. Figure 5 is a flow chart of the random access process according to Embodiment 2 of the present invention, such as Figure 5 shown, including the following steps:

[0074] In step S502, the eNB sends the MAC CE for activating SCell1 through the PCell of the UE.

[0075] In step S504, the UE receives the MAC CE on the PCell, activates the SCell1, and monitors the PDCCH on the SCell1.

[0076] In step S506, the eNB sends a dedicated random access preamble on SCell1 to perform a non-contention-based random access process, and the steps of the random access process are the same as those in the prior art.

[0077] Wherein, in steps S504 and S506, when the buffer data volume of the UE downlink data is greater than the preset threshold x, the eN...

Embodiment 3

[0079] The scenario of this embodiment is: the PCell of the UE is in the uplink out-of-sync state; SCell1 and SCell2 are in the uplink out-of-sync state, and both are deactivated, and the uplink data of the UE arrives. Image 6 is a flowchart of the random access process according to Embodiment 3 of the present invention, as shown in Image 6 shown, including the following steps:

[0080] In step S602, the UE performs a contention-based random access procedure on the PCell.

[0081] Step S604, the UE activates SCell1 after the contention on the PCell is successfully resolved; or the UE activates SCell1 after sending msg3 on the PCell; or activates SCell1 after the UE sends a random access preamble on the PCell; When the value of its BSR is greater than the preconfigured threshold x, activate SCell1; or at the above three occasions, when the UE judges that its PHR value is greater than the preconfigured threshold y, activate SCell1; or at the above three occasions, the UE judg...

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Abstract

The present invention provides a random access method and user equipment, the method includes: the UE activates the secondary serving cell SCell in the deactivated state; and the UE performs a random access procedure on the SCell. With the present invention, the UE activates the deactivated SCell to perform a random access procedure, which solves the problem that the SCell may be in a deactivated state, and the related steps of the random access procedure on the SCell cannot be performed normally, so that the UE can flexibly select The timing of random access is initiated on the SCell, thereby improving the success rate of the UE random access procedure.

Description

technical field [0001] The present invention relates to the communication field, in particular, to a random access method and user equipment. Background technique [0002] In the wireless cellular communication system, the random access procedure (Random Access Procedure) is used for the terminal (or called user equipment UE, User Equipment) in the idle state (RRC IDLE) to initially access the network, or the terminal in the connected state (RRC CONNECTED) Perform uplink synchronization with the network and obtain resource allocation for subsequent data communication. [0003] Evolved Universal Terrestrial Radio Access Network (E-UTRAN, Evolved Universal Terrestrial Radio Access Network, also known as Enhanced In the base station eNB), the following six events can trigger the random access process of the terminal: (1) initial access in idle state; (2) radio resource control connection re-establishment procedure (RRC Connection Re-establishment procedure); (3) handover ( HO...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04W74/08
CPCH04W74/0833H04W74/0838
Inventor 张健陈中明
Owner ZTE CORP
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