Feedback control method, apparatus and transceiver in OFDM system

A technology of feedback control and orthogonal frequency division, applied in the field of mobile communication, can solve the problem of balancing feedback system throughput and other issues, and achieve the effect of flexible scheduling and strong compatibility

Inactive Publication Date: 2007-09-26
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 in OFDM system
  • Feedback control method, apparatus and transceiver in OFDM system
  • Feedback control method, apparatus and transceiver in OFDM system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] Without loss of generality, this embodiment assumes that the number of subcarriers is N, divided into N g subbands, the time period for feeding back the complete MCS index is N p TTI, the feedback of each complete MCS index requires N f Each TTI feeds back the MCS index or MCS index change information of each subband, and each TTI feeds back the MCS index of the entire frequency band at the same time.

[0051] In order to implement the method of the present invention, the transmitting end and the receiving end need to pre-set the corresponding relationship table between the signal-to-noise ratio and the MCS, also known as the mapping table. In each TTI, the flow chart of the receiving end generating feedback information is shown in Figure 2 , including the following steps:

[0052] S101. The receiving end detects the SINR corresponding to the data stream on each subband and the average SINR of the entire frequency band;

[0053] S102. Determine the MCS index correspo...

Embodiment 2

[0088] A structure of a feedback control device implementing the feedback control method of the present invention is shown in Figure 4, including:

[0089] The MCS index determination unit is used to determine the MCS index corresponding to each sub-band according to the signal-to-noise ratio corresponding to the data stream on each sub-band at each transmission time interval TTI;

[0090] The specific method for determining the MCS index has been described in detail in Embodiment 1, and will not be repeated here.

[0091] The feedback execution unit is connected to the MCS index determination unit, and is used to feed back the MCS index of each subband to the data stream transmitting end for the TTI set at each interval. In other TTIs, it feeds back the relative previous subband of each subband to the data stream transmitting end. TTI MCS index change information.

[0092] The specific feedback method has been described in detail in Embodiment 1, and will not be repeated her...

Embodiment 3

[0099] As shown in Figure 5, the transceiver in an OFDM system using the feedback control device described in Embodiment 2 includes a transceiver unit for sending and receiving information and a device for detecting the signal-to-noise ratio of each sub-band The detection unit, the receiving end further includes a feedback control device, and the feedback control device specifically includes:

[0100] The MCS index determination unit is connected to the detection unit, and is used to determine the MCS index corresponding to each sub-band according to the signal-to-noise ratio corresponding to the data stream on each sub-band at each transmission time interval TTI;

[0101] The feedback execution unit is connected between the MCS index determination unit and the transceiver unit, and is used to feed back the MCS index of each subband to the data stream transmitter through the transceiver unit at the TTI set at each interval when receiving the data stream, and in For other TTIs,...

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Abstract

The invention relates to mobile communication technology, specially a feedback control method, device and receiver which are used in orthogonality frequency division multiplexing system, aiming at resolve problems that how the current technique balance the feedback quantity and system throughput. Said method of the invention includes in every emission time interval TTI, the receiver ensures the MCS index which is corresponding with sub band and / or frequency band separately; at least one TTI are in a interval, the receiver feedbacks the MCS index of sub bands, other TTI, the receiver feedbacks the MCS index change information of sub bands which is corresponding with one TTI, or feedbacks the MCS index or change information at the same time. Said device mainly includes MCS index ensuring unit and feedback executing unit, said receiver mainly includes said device and resource control unit. Using the invention can balance the feedback quantity and system throughput.

Description

technical field [0001] The 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 appropriate channel coding and modulation methods according to the channel quality and other information provided by the receiving end, typically Such as coding type, coding rate, modulation method (QPSK / 16QAM, etc.), so as to achieve the purpose of channel adaptation and maximize the transmission rate. Among them, in order to reduce the control signaling overhead caused by information such as channel quality fed back by the receiving end, the common practice is to make a typical MCS (Modulation and Coding Scheme, mod...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L1/00H04L27/26
Inventor 杜颖钢刘晟李斌
Owner HUAWEI TECH CO LTD
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