Method and device for efficient random access of user equipment

A user equipment, random access technology, applied in electrical components, wireless communication, etc., can solve the problem of not fully considering the irrationality of PRACH preamble repetition times, not considering user conflicts, etc., to achieve the effect of improving the success rate

Active Publication Date: 2015-07-29
ALCATEL LUCENT SHANGHAI BELL CO LTD
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  • Abstract
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AI Technical Summary

Problems solved by technology

[0010] The above four options do not fully consider the irrationality of the selection of PRACH preamble repetition times caused by the error

Method used

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  • Method and device for efficient random access of user equipment
  • Method and device for efficient random access of user equipment
  • Method and device for efficient random access of user equipment

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Embodiment Construction

[0035] In the following detailed description of the preferred embodiment, reference is made to the accompanying drawings which form a part hereof. The accompanying drawings show, by way of example, specific embodiments in which the invention can be practiced. The illustrated embodiments are not intended to be exhaustive of all embodiments in accordance with the invention. It is to be understood that other embodiments may be utilized and structural or logical changes may be made without departing from the scope of the present invention. Accordingly, the following detailed description is not limiting, and the scope of the invention is defined by the appended claims. It should be noted that although the steps of the relevant methods in the present invention are described in a specific order in the accompanying drawings, this does not require or imply that these operations must be performed in this specific order, or that all shown operations must be performed to achieve the desi...

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Abstract

The invention discloses a method and a device for efficient random access of user equipment. The method comprises the steps of selecting the number of random access preamble code repetition times according to a mobility general situation of the user equipment; adopting the last random access preamble code repetition times at which the user equipment successfully accesses to a base station when the mobility general situation of the user equipment indicates that the mobility is low; determining the random access preamble code repetition times according to a latest downlink measurement value and a mapping table when the mobility general situation of the user equipment indicates that the mobility is high; and selecting the random access preamble code repetition times according to an absolute value of the difference between the latest downlink measurement value and the last downlink measurement value at which the user equipment successfully accesses to the base station when the mobility general situation of the user equipment indicates that the mobility is medium. The mobility general situation is determined by a core network according to the number of base stations to which the use equipment is connected within a fixed time period. Therefore, unreasonable selection, which is brought about by a downlink measurement error, of the number of preamble code repetition times is reduced, and the frequency spectrum utilization ratio is improved.

Description

technical field [0001] The present invention relates to the field of mobile communication, more specifically, to a method and device for random access of users in the field of mobile communication. Background technique [0002] Recently started work item in LTE Release-12 (Long Term Evolution, LTE) on Low Cost and Coverage Enhanced (CE) Machine Type Communication (MTC) User Equipment (UE) One of the goals is to standardize coverage enhancement corresponding to 15dB. [0003] For the coverage enhancement of the Physical Random Access Channel (PRACH), it may be assumed that the existing PRACH preamble format is repeatedly sent to improve coverage, instead of introducing a new PRACH preamble format. [0004] In order to make the influence of the coverage enhancement on the spectrum efficiency flexible and adjustable, it is necessary to support multiple repetition times of the PRACH preamble. In the random access process, how to select an appropriate random access repetition n...

Claims

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Application Information

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IPC IPC(8): H04W74/08H04W24/08
CPCH04W24/08H04W74/0833
Inventor 陈斌陈宇
Owner ALCATEL LUCENT SHANGHAI BELL CO LTD
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