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Feedback control method, apparatus and transceiver for orthogonal frequency division multiplexing system

An orthogonal frequency division and feedback control technology, applied in the field of mobile communications, can solve the problems of balancing feedback system throughput, etc., and achieve the effects of flexible scheduling, strong compatibility, and avoiding system throughput

Inactive Publication Date: 2008-10-01
HUAWEI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0014] The present invention provides a feedback control method, device and transceiver in an OFDM system to solve the problem of how to balance feedback and system throughput in the prior art

Method used

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  • Feedback control method, apparatus and transceiver for orthogonal frequency division multiplexing system
  • Feedback control method, apparatus and transceiver for orthogonal frequency division multiplexing system
  • Feedback control method, apparatus and transceiver for orthogonal frequency division multiplexing system

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Experimental program
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Effect test

Embodiment 1

[0041] Without loss of generality, this embodiment assumes that the number of subcarriers is N, which is divided into N g subbands, the time period for feeding back the complete MCS index is N p TTIs, feedback for each full MCS index requires N f Each TTI feeds back the MCS index of each subband or the MCS index change information, and each TTI simultaneously feeds back the MCS index of the entire frequency band.

[0042] In order to implement the method of the present invention, the transmitter and the receiver need to preset a correspondence table between the signal-to-noise ratio and the MCS, also called a mapping table. At each TTI, the receiver generates the flow chart of the feedback information as follows. figure 2 shown, including the following steps:

[0043] S101, the receiving end detects the SINR corresponding to the data stream on each subband and the average SINR of the entire frequency band;

[0044] S102, determine the MCS index corresponding to each subban...

Embodiment 2

[0079] A structure of the feedback control device for realizing the feedback control method of the present invention is as follows: Figure 4 shown, including:

[0080] a channel feedback information determination unit, configured to determine the MCS index corresponding to each subband according to the signal-to-noise ratio corresponding to the data stream on each subband at each transmission time interval TTI;

[0081] The specific method for determining the MCS index has been described in detail in Embodiment 1, and will not be repeated here.

[0082] The feedback execution unit is connected to the channel feedback information determination unit, and is used to feed back the MCS index of each subband to the data stream transmitter for the TTI set at each interval, and in other TTIs, to feed back the relative top of each subband to the data stream transmitter MCS index change information for a TTI.

[0083] The specific feedback method has been described in detail in Embod...

Embodiment 3

[0090] like Figure 5 As shown, a transceiver in an orthogonal frequency division multiplexing system to which the feedback control device described in Embodiment 2 is applied includes a transceiver unit for sending and receiving information and a detection unit for detecting the signal-to-noise ratio of each subband, The receiving end further includes a feedback control device, and the feedback control device specifically includes:

[0091] a channel feedback information determination unit, connected to the detection unit, for determining the MCS index corresponding to each subband according to the signal-to-noise ratio corresponding to the data stream on each subband at each transmission time interval TTI;

[0092] The feedback execution unit is connected between the channel feedback information determination unit and the transceiver unit, and is used for feeding back the MCS index of each subband to the data stream transmitter through the transceiver unit at each interval s...

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PUM

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Abstract

The invention relates to a mobile communication technique, especially a feedback control method, a device and a transceiver in orthogonal frequency division multiplexing system for solving problem of balancing feedback quantity and system throughput in prior art. The method includes: a receiver terminal determines corresponding channel feedback information of each sub-band respectively in each transmitting time interval; the receiver feeds back each sub-band channel feedback information to a transmitter terminal at interval at least one TTI; the receiver terminal feeds back channel change information of each sub-band relative to previous TTI to the transmitter terminal, or feeds back corresponding channel information or channel change information of frequency band at the same time. The device mainly includes a channel feedback information determination unit and a feedback execution unit, the transceiver mainly includes the device and a resource control unit. The technical solution provided by the invention can balance feedback quantity and system throughput commendably.

Description

technical field [0001] The present invention relates to mobile communication technology, in particular to a feedback control method, device and transceiver used in an orthogonal frequency division multiplexing system. Background technique [0002] Adaptive coding and modulation (AMC) technology means that the receiving end feeds back the measured channel quality and other information to the transmitting end through the feedback channel, and the transmitting end selects the appropriate channel coding and modulation according to the channel quality and other information provided by the receiving end. Such as coding type, coding rate, modulation mode (QPSK / 16QAM, etc.), so as to achieve the purpose of adapting to the channel and maximizing the transmission rate. Among them, in order to reduce the control signaling overhead caused by the channel quality and other information fed back by the receiving end, the common practice is to make the typical MCS (Modulation and Coding Sche...

Claims

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Application Information

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IPC IPC(8): H04L1/00H04L1/12H04L27/26
Inventor 杜颖钢刘晟李斌
Owner HUAWEI TECH CO LTD
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