A method for adjusting the level of modulation and coding schemes

A modulation and coding method and level technology, which is applied in the level field to achieve the effect of improving transmission efficiency and adjusting in time.

Inactive Publication Date: 2018-06-22
POTEVIO INFORMATION TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] At present, a method for solving the above-mentioned technical problems has not yet been proposed

Method used

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  • A method for adjusting the level of modulation and coding schemes
  • A method for adjusting the level of modulation and coding schemes
  • A method for adjusting the level of modulation and coding schemes

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Embodiment Construction

[0021] In order to make the purpose, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0022] The core idea of ​​the present invention is: by increasing the resources of the downlink training sequence, the accuracy of channel quality estimation is improved by using the resources of the downlink training sequence, and then the level of the MCS is quickly adjusted to improve the transmission efficiency of the service.

[0023] Figure 4 It is a schematic flow chart of Embodiment 1 of the present invention, such as Figure 4 As shown, this embodiment mainly includes:

[0024] Step 401, when the base station eNodeB receives the acknowledgment message of the downlink service data activation authorization fed back by the terminal, it notifies the terminal through the Physical Control Format Indicator Channel (PCFICH) in the next...

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Abstract

The invention discloses a method for adjusting a modulation and code scheme (MCS) grade. The method comprises the following steps: when a base station eNodeB receives a confirmation message fed back by a terminal that downlink service data starts authorization, notifying the terminal at a next radio frame through a physical control format indicator channel (PCFICH); taking information sent by a local radio frame over the PCFICH as training sequence indication information; at the next radio frame, the base station constructing a training sequence, and scrambling the training sequence; performing QPSK modulation on the scrambled training sequence to obtain a modulated symbol; according to a mode that a frequency domain comes first and then comes a time domain, determining time frequency resources when the modulated symbol is used; converting data at each time frequency resource position into time domain signals for emitting to the terminal through an antenna; the terminal feeding SINR information corresponding to the received training sequence to the base station; and the base station, according to the SINR information, adjusting the downlink MCS grade. By using the method provided by the invention, it can be ensured that the MCS grade matches a current channel status.

Description

technical field [0001] The invention relates to mobile communication technology, in particular to a method for adjusting the level of Modulation and Code Scheme (MCS). Background technique [0002] A wireless communication system occupies a discontinuous spectrum bandwidth, and its schematic diagram is as follows figure 1 shown. Each physical channel with a frequency domain of 25kHz bandwidth is defined as a frequency point, up to frequency points. Each frequency point adopts OFDM technology, and all discontinuous frequency points are aggregated together, and the system performs unified scheduling and assigns them to users, which constitutes this communication system with carrier aggregation characteristics. [0003] In the wireless communication system, a wireless frame corresponding to each frequency point has a length of 25 ms and includes 45 OFDM symbols. Such as figure 2 As shown, the downlink resources occupy 13 OFDM symbols. [0004] The downlink pilot pattern...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L1/00
Inventor 王丽
Owner POTEVIO INFORMATION TECH CO LTD
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