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Data transmission method and device

A data transmission method and data technology, applied in the direction of digital transmission system, transmission system, forward error control, etc., can solve the problem of unfavorable utilization of spectrum resources, increase of feedback signaling overhead, increase several times or even dozens of times, etc. question

Active Publication Date: 2016-04-20
ZTE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] In the prior art, data retransmission at the physical layer is based on the entire transport block, that is, if at least one code block in the transport block signal transmitted for the first time is received incorrectly, all transport blocks must be retransmitted during retransmission. When receiving the correct code block during transmission, it still needs to be transmitted, which is obviously unfavorable for the utilization of spectrum resources during retransmission
If you want to improve the efficiency of retransmission, an easy way to think of is that the receiving end feedbacks each code block, so that the sending end only uses retransmission to receive the wrong code block, but this method has an obvious defect that increases The overhead of feedback signaling is increased. If each code block feeds back ACK or NACK, the number of feedback signaling will increase several times or even dozens of times, which will seriously exceed the carrying capacity of the feedback channel. Therefore, this method is not adopted by LTE. Adoption of mainstream communication technologies such as

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Examples

Experimental program
Comparison scheme
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Embodiment 1

[0154] Embodiment 1 (retransmission method embodiment):

[0155] This embodiment proposes a data transmission method, which is applied to the first transmission node, such as image 3 shown, including:

[0156] Step 101: The first transmission node sends a data signal for the first transmission to the second transmission node, wherein the data signal includes data of at least one transmission block, the transmission block includes K code blocks, and the K code blocks Divided into P sets of code blocks. Among them, K and P are positive integers, K≥3, 2≤P≤K;

[0157] Step 102: The first transmission node performs packet encoding on M code block sets in the P code block sets to obtain S check code block sets. Wherein, the length of the check code block set is T bits, M, S, and T are all positive integers, and 2≤M≤P.

[0158] Step 103: The first transmission node sends a retransmission data signal to the second transmission node, which includes at least Q bits in the check cod...

example 1

[0203] Step A1: The base station (or relay) sends a transmission block including 8 code blocks to the terminal, wherein each code block has a code block CRC, and each transmission block also has a transmission block CRC. The transmission block consists of K=8 code blocks and consists of P=2 code block sets: that is, code block set 1 and code block set 2, such as Figure 5 As shown, because K can be divisible by P, so each code block set contains K / P=4 code blocks, that is: code block set (CBset) 1 contains code blocks CB1, CB2, CB3, CB4, code block Set 2 includes code blocks CB5, CB6, CB7, and CB8.

[0204] Step A2: Due to the influence of channel errors, on the terminal side, if the transmission block CRC or code block CRC fails to pass the CRC check, that is, the terminal fails to receive the transmission block correctly, then the terminal sends the The base station (or relay) feeds back error indication information (NACK) about the transport block.

[0205] The base stati...

example 2

[0215]Step B1: The terminal sends a transport block including 39 code blocks to the base station (or relay), wherein each code block has a code block CRC, and each transport block also has a transport block CRC.

[0216] Step B2: Due to the influence of channel errors, at the base station (or relay) side, the transmission block CRC or code block CRC fails to pass the CRC check, that is, the base station (or relay) fails to receive the transport block, the base station (or relay) feeds back error indication information (NACK) about the transport block to the terminal.

[0217] The terminal divides K=39 code blocks of the transmission block into P=10 code block sets: code block set 1, code block set 2, ... code block set 10, because K cannot be divisible by P, so exist In code block sets, each code block set includes code blocks, in In code block sets, each code block set includes original code blocks and 1 filler code block; that is, in code block set 1 to code block se...

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Abstract

The invention provides a data transmission method and device. The method comprises that a first transmission node sends a data signal which is sent for the first time to a second transmission node, the data signal comprises data of at least one transmission block, the transmission block comprises K code blocks, and the K code blocks belong to P code block sets; the first transmission node carries out packet coding on M code blocks in the P code block sets to obtain S calibration code block sets; the first transmission node generates a retransmission data signal and sends the retransmission data signal to the second transmission node; and when preset conditions are satisfied, the retransmission data signal comprises Q bits in the calibration code block sets at least. According to the invention, retransmission resource is effectively reduced under the condition that the amount of feedback information is not increased.

Description

technical field [0001] The invention relates to the field of mobile communication, in particular to a data transmission method and device. Background technique [0002] In the existing LTE system, the physical layer data shared channel uses a transport block (TB) as a basic unit for data transmission. The receiving end judges whether the current TB is received correctly through the cyclic redundancy check code (CRC) of the TB. If the TB is received correctly, the receiving end feeds back an ACK message to the sending end, and if the TB is not received correctly, the receiving end feeds back a NACK message to the sending end. After receiving the NACK message, the sending end will retransmit the data to the receiving end, and the retransmission is still performed in TB. [0003] When the transmission block (TB) block size exceeds the specified threshold, the sender usually needs to perform code block (CB) segmentation, divide the TB into multiple CBs, and each CB performs op...

Claims

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Application Information

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IPC IPC(8): H04L1/00H04L1/18
CPCH04L1/00H04L1/0061H04L1/0064H04L1/0076H04L1/1812H04L1/0065H04L1/0071H04L1/1816H04L1/1867
Inventor 许进徐俊戴博
Owner ZTE CORP
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