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Method for determining downlink transmission MCS (Modulating and Coding Scheme)

A technology for transmission modulation and coding schemes, which is applied in the field of determining downlink transmission MCS, and can solve problems such as reducing service resources, occupying uplink resources, and affecting system service capacity

Inactive Publication Date: 2012-11-21
POTEVIO INFORMATION TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] It can be seen that the existing CQI feedback technology needs to occupy uplink resources, thereby reducing the service resources that can be provided by uplink
Especially for systems with relatively scarce service resources and relatively large uplink capacity requirements, the uplink resources occupied by the CQI feedback channel will relatively affect the service capacity of the system to a greater extent

Method used

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  • Method for determining downlink transmission MCS (Modulating and Coding Scheme)
  • Method for determining downlink transmission MCS (Modulating and Coding Scheme)

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Embodiment Construction

[0032] The core idea of ​​the solution of the present invention is: the base station monitors the block error rate (BLER) of downlink transmission in real time, and then adjusts the MCS used for downlink transmission according to the block error rate. If the block error rate is too small, then increase the MCS, so that the MCS used for transmission can not only track the change of the channel environment, but also ensure that the transmission block error rate is within an acceptable range, so that the uplink throughput of the transmission can be as close as possible to the channel. The maximum uplink throughput that can be carried.

[0033] In order to make the technical solution of the present invention and its effects clearer, the present invention will be further described in detail below through specific examples.

[0034] The technical solution proposed by the embodiment of the present invention is mainly divided into two stages. The first stage is to monitor the BLER, an...

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Abstract

The invention provides a method for determining a downlink transmission MCS (Modulating and Coding Scheme), which comprises the following steps of: A, recoding a downlink transmission result fed back by a user within a BLER (Block Error Ratio) statistical length, generating a transmission result record list for the user; B, calculating the BLER according to content recorded in the transmission result record list for the user; C, regulating the MCS according to the calculated BLER. With the technical scheme of the invention, the MCS is regulated according to a BLER value without occupying extra uplink transmission resources, and further, a uplink transmission capacity of a system is increased. Effects of fast drop and slow rise can be achieved while the MCS is regulated, thus, a lower BLER during an entire transmission process can be ensured, and the BLER is in an acceptable range. The method is suitable for the system having a slow channel change environment and a fixed terminal position.

Description

technical field [0001] The present invention relates to the technical field of mobile communication, in particular to a method for determining downlink transmission MCS. Background technique [0002] In existing wireless communication systems, in order to determine the modulation and coding scheme (MCS) for downlink transmission, the base station often needs the user equipment (UE) to estimate the signal-to-interference ratio of the received signal, determine the feedback channel quality indicator (CQI), and then the base station The MCS used for downlink transmission is determined according to the received CQI, which is called a CQI feedback mechanism. In order to determine the CQI to be fed back, the UE needs to estimate the signal-to-interference ratio of the received signal through an algorithm based on the received signal, then determine the CQI to be fed back through the signal-to-interference ratio, and then occupy uplink resources to transmit the fed-back CQI to the ...

Claims

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Application Information

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IPC IPC(8): H04L1/00H04L1/16
Inventor 王彬朱颖
Owner POTEVIO INFORMATION TECH
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