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Method and device for efficient random access of user equipment

A user equipment, random access technology, applied in wireless communication, electrical components, etc., can solve the problems of not fully considering the unreasonable number of PRACH preamble repetitions, not considering user conflicts, etc., and achieve the effect of improving the success rate

Active Publication Date: 2019-04-19
ALCATEL LUCENT SHANGHAI BELL CO LTD
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  • Description
  • Claims
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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 of the downlink measurement value, or do not consider the conflict between users caused by selecting a single PRACH preamble repetition number

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 embodiments, reference will be 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 modifications may be made without departing from the scope of the present invention. Therefore, the following detailed description is not intended to be limiting, and the scope of the invention is defined by the appended claims. It should be noted that although the steps of the related methods of the present invention are described in the drawings in a specific order, this does not require or imply that the operations must be performed in the specific order, or that all the illustrated operations must be performed t...

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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 communications, and more particularly, to a method and device for random access of users in the field of mobile communications. Background technique [0002] Work Item on Low Cost and Coverage Enhanced (CE) Machine Type Communication (MTC) User Equipment (UE) recently started in LTE Release-12 (Long Term Evolution, LTE) One of the goals is to standardize the coverage enhancement corresponding to 15dB. [0003] For coverage enhancement of the Physical Random Access Channel (PRACH), it may be assumed that the existing PRACH preamble format is repeatedly transmitted to improve coverage, rather than introducing a new PRACH preamble format. [0004] In order to make the impact of coverage enhancement on spectrum efficiency flexible and adjustable, it is necessary to support multiple PRACH preamble repetition times. In the random access process, how to select an appropriate random access repetition numbe...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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