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Method and device for selecting TDD physical random access channel

A technology of physical random access and selection mode, which is applied in the field of communication, can solve problems such as large differences and unbalanced physical random access channel load, and achieve the effects of improving load balance, ensuring access delay, and saving system resources

Inactive Publication Date: 2010-06-16
CHINA ACAD OF TELECOMM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0026] The existing method of selecting physical random access channels will lead to unbalanced load of each physical random access channel, and the difference is too large

Method used

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  • Method and device for selecting TDD physical random access channel
  • Method and device for selecting TDD physical random access channel
  • Method and device for selecting TDD physical random access channel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0060] like Figure 10 As shown, at point A, the terminal is triggered. According to rule 1, the terminal will randomly select a PRACH in PRACH set 1 to send, that is, randomly select one from subframes 2, 3, and 4 to carry the load; at point B , the terminal is triggered, and according to rule 1, the terminal will randomly select a PRACH from PRACH set 2 to send. The following describes the application process of Rule 1 in detail.

[0061] like Figure 10 As shown, PRACHs that are consecutive in time can be regarded as a set. In set 1, since the three PRACHs (subframes 2, 3, and 4) are consecutive in time, the three consecutive PRACHs (subframes 2, 3, and 4) are regarded as one set. The PRACHs where subframes 7 and 9 are located are not consecutive in time, so each PRACH is a set respectively. The process for the terminal to select PRACH is as follows:

[0062] 1), the terminal initiates random access;

[0063] 2), find the nearest PRACH set that can send preamble, set ...

Embodiment 2

[0078] like Figure 11 As shown, all PRACHs in a certain time window can be called a set. Two PRACHs are included in set 1: subframes 2, 4. Set 2 also contains two PRACHs: subframes 7 and 9.

[0079] Using Rule 2, the process is:

[0080] After random access, the terminal needs to find the nearest PRACH set that can send the preamble, and then randomly select a PRACH in the PRACH set to send the preamble.

[0081] If the method of dividing the set is not adopted, after the terminal initiates random access, it needs to find the nearest PRACH that can send the preamble, and then find all the PRACHs within the predetermined time window after this PRACH, and then randomly select a PRACH among these PRACHs. Send the preamble.

[0082] Next, introduce Figure 11 The detailed process of using rule two for selection in :

[0083] Taking the time window of 5ms as an example, the random access triggered by point A randomly selects a PRACH resource in PRACH set 1 to send; the rando...

Embodiment 3

[0105] like Figure 12 As shown, on the basis of the above embodiments, the present invention also provides the third embodiment, including:

[0106] 1201. Set a physical random access channel as a physical random access channel resource;

[0107] 1202. Randomly select a physical random access channel from the physical random access channel resources.

[0108] Wherein, the setting of the physical random access channel as the physical random access channel resource includes:

[0109] Set at least one physical random access channel closest to the trigger point as a physical random access channel resource.

[0110] Wherein, setting at least one nearest physical random access channel after the trigger point as the physical random access channel resource includes:

[0111] If the nearest physical random access channels after the trigger point are continuous in time, all the physical random access channels that are continuous in time are set as one physical random access channel ...

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Abstract

The implementation of the invention discloses a method for selecting TDD physical random access channel, including setting physical random access channel as physical random access channel resource and randomly selecting the physical random access channel from the physical random access channel resource. The implementation of the invention also discloses a device for selecting TDD physical random access channel, comprising a setting unit used for setting physical random access channel as physical random access channel resource and a selection unit used for randomly selecting the physical random access channel from the physical random access channel resource. By utilizing the technical scheme of the invention, load balance of the physical random access channel can be improved.

Description

technical field [0001] The invention relates to the technical field of communication, in particular to a method and a device for selecting a TDD physical random access channel. Background technique [0002] The time slot ratio configuration in TDD (Time Division Duplex, Time Division Duplex), as shown in Table 1: [0003] Table 1 [0004] [0005] PRACH (Physical Random Access Channels, physical random access channel) is a time-frequency resource for a terminal to send a preamble (access prefix). For LTE FDD (long term evolution frequency division duplex, long term evolution frequency division duplex) system, the configuration of PRACH resources is shown in Table 2: [0006] Table 2 PRACH configuration in LTE FDD [0007] PRACH configuration (PRACH configuration) System frame number (system frame number) Subframe number 0 Even (even frame) 1 1 Even 4 2 Even 7 3 Any (odd and even...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W74/08H04B7/26
Inventor 杨晓东谌丽李国庆
Owner CHINA ACAD OF TELECOMM TECH
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