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Method, device and system for sending prach preamble

A transmission method and preamble technology, applied in the field of communication, can solve the problems of increased preamble probability and high access failure probability, etc.

Inactive Publication Date: 2020-04-03
HUAWEI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in the prior art, when the UE performs repeated transmission of the PRACH preamble, the probability of multiple UEs using the same signature sequence to send the PRACH preamble to the base station on the same AS increases.
[0004] Therefore, there is a problem in the prior art that when the UE repeatedly sends the PRACH preamble, the probability of access failure is relatively high

Method used

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  • Method, device and system for sending prach preamble
  • Method, device and system for sending prach preamble
  • Method, device and system for sending prach preamble

Examples

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Embodiment 3

[0101] This embodiment is an example for the controller to determine the access slot information according to the number of repetitions of a PRACH preamble.

[0102] Scenario 1: Assume that the AS numbers are 0-14; the number of PRACH preamble repetitions is 8; the number of RACH sub-channels is 12, and the numbers are 0-11. The access slot information may be specifically shown in Table 2. 0-11 in the row next to "RACH sub-channel number" in Table 2 respectively represent 12 RACH sub-channels, and 0-15 in the same column as "SFN%16" respectively represent 16 remainders after SFN modulo 16, Other numbers 0-14 are used to indicate the number of the starting AS.

[0103] Table 2

[0104]

[0105] As shown in Table 2, when SFN%16 is equal to 0, the starting AS corresponding to No. 0 RACH subchannel is No. 0 AS; it means the 8 ASs starting from the 0th AS of the wireless frame where SFN%16 is equal to 0 It is used for the same UE to send the same PRACH preamble.

[0106] It ...

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Abstract

Embodiments of the present invention provide a method, device, and system for sending a PRACH preamble; the access time slot information is determined by the controller according to at least one PRACH preamble repetition number; the access time slot information includes the starting time corresponding to each RACH subchannel The starting AS; the number of repetitions of the PRACH preamble starting from the starting AS is used for the same UE to send the same PRACH preamble; the controller sends the access slot information to each UE, so that each UE Repeatedly send the PRACH preamble to the base station according to the access slot information; so that the PRACH preamble repetition times starting from the starting AS are all used for the same UE to repeatedly send the PRACH preamble to the base station; solve the problem caused by the repeated transmission of the PRACH preamble The problem of increased collision chance; thereby reducing the probability of access failure.

Description

technical field [0001] Embodiments of the present invention relate to communication technologies, and in particular to a method, device and system for sending a Physical Random Access Channel (PRACH, Physical Random Access Channel) preamble. Background technique [0002] A user equipment (UE, User Equipment) needs to initiate a random access procedure before performing data transmission with a base station. [0003] In the prior art, during the random access process, the UE needs to randomly select an access slot (AS, Access slot) from the random access channel (RACH, Random Access Channel) sub-channels available to the UE, and use the AS to Send a PRACH preamble to the base station. If multiple UEs use the same signature sequence to send PRACH preambles to the base station on the same AS, the base station cannot distinguish the PRACH preambles sent by different UEs, resulting in access failure of UEs using the same signature sequence. Usually, in order to improve the cove...

Claims

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Application Information

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IPC IPC(8): H04W74/08
CPCH04W74/004H04W74/0833H04W72/0446H04W74/008H04W74/085H04W88/02H04W88/08
Inventor 黄雯雯赵悦莹
Owner HUAWEI TECH CO LTD
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