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A method and device for mtc UE random access

A random access and physical random access technology, which is applied in machine-to-machine/machine-type communication services, wireless communication, electrical components, etc., and can solve the problems of difficulty in timely and accurate information about UE, and no clear method.

Active Publication Date: 2019-02-01
DATANG MOBILE COMM EQUIP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the case of no data transmission for a long time, it is difficult for the eNB on the network side to know the current CELEVEL of the UE in a timely and accurate manner.
In this case, there is no clear method for UE to select PRACH resources

Method used

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  • A method and device for mtc UE random access
  • A method and device for mtc UE random access
  • A method and device for mtc UE random access

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0209] The PDCCH order sent by the ENB carries each CE LEVEL agreed in the protocol and its corresponding PRACH resource.

[0210] The network side indicates 3 CE LEVELs and their corresponding PRACH resources to the UE, and the PDCCH order carries the PRACH mask index and preamble index of each CELEVEL;

[0211] The UE obtains the current CE LEVEL according to the current measurement, obtains the corresponding PRACH maskindex and preamble according to the CE LEVEL, performs RACH transmission according to the information, and performs subsequent transmission according to the CE LEVEL;

[0212] If this Preamble transmission fails or fails after reaching the maximum number of attempts, the UE automatically transitions to a higher CE LEVEL, and then finds the PRACH mask index and preamble index given in the PDCCH order according to the CE LEVEL, and initiates a non-competitive random access Entry process CFRA process.

Embodiment 2

[0214] The PDCCH order sent by the ENB carries a dedicated PRACH resource of 1 CE LEVEL.

[0215] The network indicates a PRACH resource of 1 CE LEVEL to the UE;

[0216] The UE initiates CFRA according to the PRACH resources configured by the network and the corresponding CE LEVEL;

[0217] If this Preamble transmission fails or still fails after reaching the maximum number of attempts, the UE automatically transitions to a higher CE LEVEL (it can also initiate a contention random access process CBRA according to its current real CE LEVEL).

Embodiment 3

[0219] The PDCCH order sent by the ENB carries a dedicated PRACH resource of 1 CE LEVEL.

[0220] The network indicates a PRACH resource of 1 CE LEVEL to the UE;

[0221] The UE's current CE LEVEL is better than the CE LEVEL indicated by the network, and uses the PRACH resource corresponding to the CE LEVEL indicated by the network to initiate CFRA.

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PUM

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Abstract

The present invention provides a method and device for MTC UE random access, the method includes: receiving indication information sent by the network side, the indication information is used to indicate at least one coverage enhancement level CE LEVEL and its corresponding physical random access channel PRACH resources; select a CE LEVEL from its own CE LEVEL and the CE LEVEL indicated by the network side and determine the PRACH resource corresponding to the CE LEVEL; perform random access on the PRACH resource corresponding to the selected CE LEVEL. The present invention provides a mechanism of how to select PRACH resources when the network side triggers the MTC UE to initiate a non-contention random access CFRA process.

Description

technical field [0001] The present invention relates to the technical field, in particular to a method and device for MTC UE random access. Background technique [0002] 1) MTC (Machine Type Communication, Machine Type Communication) [0003] With the rise of the Internet of Things, more and more attention is paid to supporting MTC in an LTE (Long Term Evolution, long-term evolution) system. In 3GPP Release 13, a physical layer enhancement project for MTC was established. An MTC device (MTC terminal) may have some of the characteristics of various M2M (Machine to Machine, machine to machine) communication features, such as low mobility, small amount of transmitted data, insensitive to communication delay, and extremely low requirements characteristics such as power consumption. Among them, in order to reduce the cost of the MTC terminal, a new terminal type will be defined, and its uplink and downlink only support 1.4MHz radio frequency bandwidth. [0004] In the existin...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04W74/08
CPCH04W74/0833H04W74/006H04W4/70H04W74/08H04W16/26
Inventor 许芳丽刘建华李心宇
Owner DATANG MOBILE COMM EQUIP CO LTD
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