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A Pilot Random Access Method Based on Timing Advance Information

A timing advance information and random access technology, applied in wireless communication, baseband system components, electrical components, etc., can solve the problem of low number of successful access users, reduce the probability of collision, and increase the number of successful access users Effect

Active Publication Date: 2019-10-11
XIDIAN UNIV
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to overcome the deficiencies of the prior art above, and propose a pilot random access method based on timing advance information, which is used to solve the existing pilot random access method when the system load is large. Technical issues with low number of registered users

Method used

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  • A Pilot Random Access Method Based on Timing Advance Information
  • A Pilot Random Access Method Based on Timing Advance Information
  • A Pilot Random Access Method Based on Timing Advance Information

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Embodiment Construction

[0032] The present invention will be described in further detail below in conjunction with the accompanying drawings and specific implementation examples.

[0033] refer to figure 1 , a pilot random access method based on timing advance information, comprising the following steps:

[0034] Step 1, use 16f to quantify the propagation delay of all users in the cell, and obtain the timing advance information Ω of all users, and Ω=[T 1 , T 2 ,...,T k ,...,T U ], while using 16cf to quantify the radius of the cell to obtain different quantization intervals and quantization interval numbers n, and n=1,2,...,Q, where f represents the minimum time unit of the LTE system, and k represents the cell The number of users in the cell, and k=1,2,...,U, U represents the total number of users in the cell, T k Represents the timing advance information of user k, c represents the speed of light, n represents the quantization interval number, and Q represents the maximum quantization interva...

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Abstract

The invention provides a pilot random access method based on timing advance information and aims to solve the technical problem of the small number of successful access users during higher system load in the conventional pilot random access method. The method comprises the following steps: 1, propagation delay and cell radius of users are quantized; 2, the users select pilot sequences; 3, the users send pilot sequences with addition of cyclic prefixes as well as identification codes; 4, a base station sends pilot random access response information; 5, the users judge whether themselves meet timing advance information requirements, if yes, step 6 is executed, otherwise, pilot random access is finished; 6, the strongest user resends the pilot sequence and the identification code; 7, the base station sends collision resolution information. With adoption of the method, the number of successful access users is high during higher system load, and the problem of pilot pollution in a massive MIMO (multiple-input multiple-output) system can be solved.

Description

technical field [0001] The invention belongs to the technical field of wireless communication, and relates to a pilot random access method, in particular to a pilot random access method based on timing advance information, which can be used to alleviate the pilot pollution problem in a large-scale multiple-input multiple-output system . Background technique [0002] Multiple-input multiple-output (MIMO) technology refers to the use of multiple transmitting antennas and receiving antennas at the transmitting end and the receiving end, making full use of space resources, without increasing spectrum resources and antenna transmit power. Next, increase the system channel capacity. Massive MIMO technology is based on the improvement of MIMO technology. By configuring dozens or even hundreds of antennas at the base station, it can obtain spectrum utilization, data rate and energy efficiency superior to MIMO technology. In a massive MIMO system for H2H (Human to Human) users, eac...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04W74/00H04L25/02H04B7/0456
Inventor 李颖李晓洁韩会梅
Owner XIDIAN UNIV
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