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A Method for Reducing Random Access Latency on Unlicensed Spectrum

A random access, unauthorized technology, applied in the direction of wireless communication, electrical components, etc., can solve the problems of high time delay and low probability of channel access, so as to improve the probability of success, save power, and reduce the number of times of LBT

Active Publication Date: 2020-03-17
BEIJING UNIV OF POSTS & TELECOMM
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The present invention mainly solves the problem that in the LAA system, the channel access probability of random access is low and the time delay of the whole random access process is high.

Method used

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  • A Method for Reducing Random Access Latency on Unlicensed Spectrum
  • A Method for Reducing Random Access Latency on Unlicensed Spectrum
  • A Method for Reducing Random Access Latency on Unlicensed Spectrum

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Embodiment Construction

[0016] A method for reducing the random access delay on the unlicensed frequency spectrum of the present invention will be described in detail below with reference to the drawings and embodiments.

[0017] The present invention proposes a method for reducing the random access delay on the unlicensed frequency spectrum in the LAA system. In the method, first, the base station configures multiple unlicensed Carriers are used for random access. In subframe #n, the base station sends a PDCCH order to notify the UE to perform multi-carrier random access in the LAA SCell. In subframe #n+k-1, the present invention introduces a new signaling (called a physical indication signal) for carrying channel state information of N (N≥2) carriers, specifically, the eNB LBT is performed on the N carriers, and then the channel state information of the N carriers is obtained according to the LBT results, and sorted; then a physical indication signal is sent on the carrier with the best channel st...

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Abstract

The invention discloses a method for reducing random access delay on an unauthorized spectrum, belonging to the field of mobile communication technology. The method comprises the following steps: adopting an 'LBT sequential indication' method, ensuring that a base station adopts multi-carrier scheduling for the random access of a terminal, introducing a physical indication signal, enabling eNB to indicate UE to execute the sequence of the LBT for each unauthorized carrier that is configured for random access based on the signaling before the UE performs PRACH transmission to ensure that the UE can access to the channel as soon as possible. As the base station transmits the physical indication signal on a specified idle carrier, the effect of channel reservation can be achieved to a certain extent, and thus the probability of successful first idle carrier sensing of the terminal can be further increased, and the delay of the random access process can be reduced.

Description

technical field [0001] The invention belongs to the technical field of mobile communication, relates to an assisted authorized access (LAA) system, and specifically refers to a method for reducing random access time delay on an unlicensed frequency spectrum. Background technique [0002] In a Long Term Evolution (LTE) system, a user equipment (UE) can perform uplink transmission only after establishing a connection with a cell through a random access procedure and obtaining uplink synchronization. Two random access procedures are defined in the LTE standard, namely contention-based random access and non-contention-based random access. In the contention-based random access process, the UE will randomly select a preamble from the network-configured preamble resource pool to send, so multiple users may use the same preamble, resulting in preamble conflicts. In the non-contention-based random access process, the network will assign a specific preamble to the user, and since oth...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04W74/08
CPCH04W74/0808H04W74/0833
Inventor 李勇刘春花彭木根
Owner BEIJING UNIV OF POSTS & TELECOMM
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