Link adaptive method for grant-free uplink transmission

A transmission format and data transmission technology, which is applied in the direction of multiple use of transmission paths, transmission systems, digital transmission systems, etc., can solve the problems of reducing the overall network capacity and service quality perception, increasing transmission delay, and low base station transmission efficiency. Achieve the effect of reducing the perception of overall capacity and service quality, improving accuracy, ensuring transmission efficiency and transmission delay

Active Publication Date: 2017-12-08
BEIJING UNIV OF POSTS & TELECOMM
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Problems solved by technology

[0007] For the existing grant-free uplink transmission, due to the lack of closed-loop control of the transmission format by the base station, the transmission efficiency is low, the transmission delay increases, and the overall capacity of the network and the perception of service quality are reduced. Link Adaptation Method for Scheduling Uplink Transmission

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  • Link adaptive method for grant-free uplink transmission
  • Link adaptive method for grant-free uplink transmission
  • Link adaptive method for grant-free uplink transmission

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Embodiment Construction

[0018] In order to illustrate the technical solution of the present invention more clearly, the accompanying drawings that need to be used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. Ordinary technicians can also obtain other drawings based on these drawings on the premise of not paying creative work.

[0019] For grant-free uplink transmission, due to the lack of closed-loop control of the transmission format by the base station, the user terminal can only adopt open-loop adaptive control, and it is difficult to obtain an accurate estimate of the uplink channel condition, so it is impossible to compare the transmission format with the channel condition. Accurate matching will result in reduced transmission efficiency or increased transmission delay, reducing the overall capacity of the network and perception of service quality. Cons...

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Abstract

The invention discloses a link adaptive method for a grant-free uplink transmission, and belongs to the field of mobile communication. The method includes the following steps: a base station dividing transformats that are available to a system into N ranks, the base station configuring N interactive orthogonal resources in the PSCCH for transmitting transformat indication; after a certain user successfully transmits data in an uplink, the user transmitting an indicating signal in the resource corresponding to the transformat which is employed in the transmission, performing monitoring, and once the indicating signal of the transformat at any position is detected, at least recording the transformat and the intensity of the signal, and the time of the appearance of the signal; when the user conducts grant-free uplink data transmission, based on the intensities and time of appearance of the indicating signals of respective transformats, selecting the transformat employed in the data transmission. According to the invention, diversity technology is employed in transmission technology to overcome the difference of small-scale fading of the channel, so that the method herein is more effective in increasing the accuracy of link adaptivity.

Description

technical field [0001] The invention belongs to the field of mobile communication, and specifically refers to a link adaptive method for uplink transmission without scheduling. Background technique [0002] In a wireless communication system, the transmission rate and reliability of a link are directly affected by the channel environment. When the channel condition is good, a relatively high-order modulation and coding method can be used to improve transmission efficiency and system capacity; when the channel condition is not good enough, a relatively low-order modulation and coding method can be used to improve transmission reliability. Therefore, starting from 3G HSDPA (High Speed ​​Downlink Packet Access) / HSUPA (High Speed ​​Uplink Packet Access, high speed uplink packet access), link adaptation is taken as a key technology to improve packet-based The capacity of the mobile communication system for transmission; this technology has also been widely used in the current 4G...

Claims

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Application Information

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IPC IPC(8): H04L5/00H04W72/12
CPCH04L5/0096H04W72/1221H04W72/21
Inventor 李勇孙薇淇
Owner BEIJING UNIV OF POSTS & TELECOMM
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