Check patentability & draft patents in minutes with Patsnap Eureka AI!

Method and device for selecting PRACH

A technology for selecting windows and selecting probabilities, which is applied in the field of communication, and can solve the problems of UE random access delay increase and delay increase

Active Publication Date: 2010-06-09
HUAWEI TECH CO LTD
View PDF0 Cites 6 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] For example, if figure 1 As shown, if the UE prepares to send a random access message Msg1 (message 1) at subframe 5 and selects the frequency band f1, the UE needs to wait until subframe 4 of the next radio frame before sending Msg1, thus greatly increasing the number of UEs sending The delay of the random access message Msg1, which in turn leads to an increase in the random access delay of the UE

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method and device for selecting PRACH
  • Method and device for selecting PRACH
  • Method and device for selecting PRACH

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0073] In the first embodiment, the process for the corresponding UE to select the PRACH may include:

[0074] (1) Let C=R(1)+R(2)+...+R(N);

[0075] (2) When the UE needs to select the PRACH, the UE can randomly select an integer between 1 and C, assuming that the integer selected by the UE is M,:

[0076] If R(1)+R(2)+...+R(x-1)

[0077] If M<=R(1), the UE selects PRACH 1 as the PRACH applied during random access;

[0078] If R(1)

[0079] And so on,......

[0080] Specifically, you can use image 3 As shown in the example, assuming that subframes are numbered starting from the integer 10, with subframe 0 as the starting point of the window, the R(x) of each PRACH is expressed as image 3 As shown, the corresponding selection process includes:

[0081] (1) Calculate C=R(1)+R(2)+...+R(...

Embodiment 2

[0094] In the second embodiment, specifically, the square of the number of each subframe is used as the corresponding R(x), and the calculation of the C value and the selection of the PRACH are performed according to the R(x).

[0095] still with image 3 As an example, and the square of each subframe number in Embodiment 1 is used as R(x), when the starting point of the window is located in a different subframe, the corresponding probability P(x) is as follows Figure 6 As shown, the average selection probability of each PRACH is still basically the same, it can be seen that the utilization rate of each PRACH is still very close, but compared with Embodiment 1, the fairness of the use of PRACH has a little worse, this is due to different PRACH The difference between the R(x) becomes larger, so the probability that the UE selects the PRACH with a smaller time delay increases.

[0096] Similarly, in this calculation method, when the starting points of the windows are located i...

Embodiment 3

[0112] In this third example, as Figure 9A As shown, the corresponding PRACH structure contains two adjacent PRACH#1 and PRACH#2; based on Figure 9A , the corresponding PRACH selection process may include:

[0113] First, since a PRACH continuous block is included in the determined window, the window is the first subframe after the PRACH continuous block;

[0114] Secondly, the number of subframes corresponding to each PRACH is calculated as: 10 / N=10 / 2, the subframes within the first 5ms in the window are all corresponding to PRACH#1; the subframes within the second 5ms are all corresponding to PRACH #2.

[0115] Finally, after the above allocation operation is completed, the PRACH selection operation in the random access process can be performed according to the subframe position of the initial subframe in the window;

[0116] still see Figure 9A As shown, assuming that A, B, C, and D are four initial subframe positions, according to the above configuration, it is nece...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention is a method and a device for selecting a PRACH. The method comprises the following steps: determining a PRACH selection window of user equipment during a random access process; and selecting the physical random access channel (PRACH) for the random access in the PRACH selection window. The embodiment by the invention is implemented according to selected random access time delay and the utilization rate of the PRACH during the random access process of the user equipment so as to achieve a balance between small random access time delay and balanced utilization rate of PRACH.

Description

technical field [0001] The present invention relates to the field of communication technology, in particular to a technology for selecting PRACH. Background technique [0002] The LTE (LoNg TerM EvolutioN, Long Term Evolution) mobile communication architecture in 3GPP (Third Generation Partnership Project) has the advantages of higher spectrum utilization, transmission speed, and lower transmission delay. [0003] Currently, in the LTE architecture, the corresponding random access methods include contention mode and non-competition mode, where: [0004] The random access of the contention mode uses the non-dedicated PreaM ble (preamble) contained in the PRACH (Physical Random Access Channel), and the corresponding non-dedicated PreaM ble will tell the UE (user equipment) in the cell broadcast, so that the UE can initiate When accessing, randomly select a PreaMBle to access. Specifically, in the contention mode, the UE can select one access among all PRACHs. [0005] The r...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): H04W74/08
Inventor 谢明江黄曲芳
Owner HUAWEI TECH CO LTD
Features
  • R&D
  • Intellectual Property
  • Life Sciences
  • Materials
  • Tech Scout
Why Patsnap Eureka
  • Unparalleled Data Quality
  • Higher Quality Content
  • 60% Fewer Hallucinations
Social media
Patsnap Eureka Blog
Learn More

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2025 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com