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Data sending and receiving method and device

A data sending method and technology at the receiving end, applied in digital transmission systems, using return channels for error prevention/detection, electrical components, etc., can solve problems such as wasting OFDM symbols and unable to send data normally, so as to ensure correct transmission and save transmission Effects of Symbolic Resources

Active Publication Date: 2017-03-22
DATANG MOBILE COMM EQUIP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0015] In summary, the OFDM symbols or DFT-S-OFDM symbols on both sides of the D2D subframe cannot send data normally. One method is to use only the middle OFDM symbols or DFT-S-OFDM symbols to send data, but it will waste two OFDM symbols. Symbol or DFT-S-OFDM symbol resources

Method used

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  • Data sending and receiving method and device
  • Data sending and receiving method and device
  • Data sending and receiving method and device

Examples

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Embodiment 1

[0087] It is assumed that the D2D sending terminal sends D2D data in one D2D subframe, and the modulation mode of the D2D data is OFDM or DFT-S-OFDM. The number of OFDM symbols in a D2D subframe (the OFDM symbols mentioned later can also refer to DFT-S-OFDM symbols) is denoted as L, respectively numbered 0,...,L-1, and OFDM symbol 0 is the first OFDM symbols, OFDM symbol L-1 is the last OFDM symbol. In the LTE system, L=12 (under the extended cyclic prefix (CP)) or L=14 (under the normal CP). Note that the number of IFFT / FFT transformation points in OFDM or DFT-S-OFDM modulation is N.

[0088] The first and / or Lth OFDM symbols in a D2D subframe are characterized by the fact that the transmitted time domain signals are repeated back and forth, that is, the first 1 / 2 symbol and the last 1 / 2 symbol of the first OFDM symbol are transmitted The signal is repeated in the time domain, and the signal transmitted by the first 1 / 2 symbol and the last 1 / 2 symbol of the Lth OFDM symbol ...

Embodiment 2

[0097] The D2D receiving terminal only receives the second half of the time domain signal of the first OFDM symbol of the D2D subframe in the time domain, and / or receives the first half of the time domain signal of the Lth OFDM symbol, such as Figure 8a shown.

[0098] After the D2D receiving terminal receives the second half of the time domain signal or the first half of the time domain signal (the CP has been removed), there are several processing methods as follows:

[0099] First, use N / 2-point DFT transform (FFT) to transform the time-domain signal sampling points into the frequency domain for equalization processing, such as Figure 8b shown. Before performing DFT transformation, it is necessary to weight the time-domain sampling values, and the specific weighting method is z k =g k r k , k=0,1.,,,.N / 2-1. where g k is the weighted value of the kth time-domain sampling value point.

[0100] If the signal is transmitted on even subcarriers, then g k =1, k=0,1.,,,....

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Abstract

Disclosed are a method and device for sending and receiving data, relating to wireless communications and used for conserving system transmission symbol resources and ensuring correct transmission of data. In the present invention, when a sending terminal sends a signal by means of the transmission symbols inside the subframe, if the signal sent by the first half of the nth transmission symbol and the signal sent by the second half of the nth transmission symbol are redundant signals in the time domain, then a receiving terminal receives the first half time domain signal or the second half time domain signal of the nth transmission symbol, and demodulates the received time domain signal. Using the present invention conserves system transmission symbol resources and ensures correct transmission of data.

Description

technical field [0001] The invention relates to the field of wireless communication, in particular to a data sending and receiving method and device. Background technique [0002] In traditional cellular communication technology, the data communication process between two terminals is as follows: figure 1 shown. The voice and data services of the two terminals interact through the base station (eNB) where they reside and the core network. [0003] Device-to-Device (D2D) technology refers to the way that adjacent terminals can transmit data through direct links within a short distance without forwarding through central nodes (ie, base stations), such as figure 2 shown. The short-distance communication characteristics and direct communication mode of D2D technology make it have the following advantages: [0004] First, the terminal short-distance direct communication method can achieve higher data rate, lower delay and lower power consumption; [0005] Second, using the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L27/26H04L1/18
CPCH04L27/2643H04L1/189H04L27/2647
Inventor 高秋彬陈文洪赵锐彭莹
Owner DATANG MOBILE COMM EQUIP CO LTD
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