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Adaptive modulation coding method based on CQI prediction

A technology of adaptive modulation and modulation coding, applied in the field of communication, can solve problems such as reducing system performance and affecting AMC technology

Inactive Publication Date: 2010-08-18
SUN YAT SEN UNIV +1
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  • Abstract
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Problems solved by technology

Under the condition of high-speed movement of the user, the error cannot be ignored, which affects the AMC technology and reduces the system performance

Method used

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  • Adaptive modulation coding method based on CQI prediction
  • Adaptive modulation coding method based on CQI prediction
  • Adaptive modulation coding method based on CQI prediction

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Embodiment Construction

[0045] The present invention will be further described in detail below in conjunction with the accompanying drawings.

[0046] The working principle of AMC is to understand the current channel situation according to the feedback from the UE. The specific process is that the UE performs channel estimation according to the data transmission on the high-speed physical downlink shared channel HS-DPSCH, and maps the SNR estimated value to CQI, and then through the uplink dedicated The physical channel HS-DPCCH is fed back to Node B, and Node B selects an appropriate modulation and coding method for the next data frame according to the received CQI, such as figure 2 shown.

[0047] The definition of CQI in 3GPP is as follows:

[0048] During the unrestricted observation time, the UE reports the highest CQI value, which satisfies: the UE can receive the transport block size and codeword of the high-speed downlink shared channel HS-DSCH within the reference time of 3 time slots The H...

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Abstract

The invention discloses an adaptive modulation coding method based on CQI prediction, which comprises the following steps: (a) in Node B, according to the CQI predicted value obtained from the CQI value transmitted in the previous frame data fed back by a UE and CQI history stored in Node B by using a CQI prediction algorithm, selecting a proper modulation coding scheme (MCS) for the next frame; (b) scrambling with a PN generator by using a binary information frame generated by Node B, and carrying out coding modulation according to the selected MCS, and sending out the information; (c) carrying out the reverse process of step (b) by the UE, wherein if receiving correctly, returning an ACK indication to Node B, or else, returning NACK; and meanwhile, calculating the CQI value of the frame, and reporting the CPI value to Node B. The invention overcomes the defect that the AMC performance degrades when the UE of the HSDPA system operates at high speed.

Description

technical field [0001] The present invention relates to the field of communication technology, in particular to an adaptive modulation and coding method based on CQI prediction. Background technique [0002] The actual wireless communication channel has two characteristics of time-varying and fading, so its channel capacity is a time-varying random variable. In order to maximize the use of channel capacity, HSDPA adopts adaptive modulation and coding technology (AMC), so that NodeB (base station) can adjust the modulation mode (QPSK / 16QAM) and Turbo Coding efficiency, so that the data transmission rate can be matched with the time-varying random channel capacity variable, and high cell throughput and spectrum utilization can be obtained. The AMC technology combining Turbo codes and MQAM (QPSK / 16QAM) is one of the key technologies for improving system capacity and transmission quality in future mobile communications. [0003] According to the different channel conditions, A...

Claims

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Application Information

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IPC IPC(8): H04W28/18H04W72/04
Inventor 戴宪华陈莉莉李勇庞斌陈嫦娟廖建强肖舟
Owner SUN YAT SEN UNIV
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