A retransmission method and device for wireless communication

A wireless communication and wireless signal technology, which is applied in the field of LTE-based wireless signal retransmission, and can solve the problem of flexibly adjusting the size of the retransmitted signal.

Active Publication Date: 2019-10-01
SHANGHAI LANGBO COMM TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, one problem with HARQ is that the transmitter cannot flexibly adjust the size of the retransmission signal according to the receiving quality of TB (Transport Block, transport block)

Method used

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  • A retransmission method and device for wireless communication
  • A retransmission method and device for wireless communication
  • A retransmission method and device for wireless communication

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0094] Embodiment 1 illustrates the flowchart of downlink transmission in LTE system, as attached figure 1 shown. attached figure 1 In , base station N1 is the maintenance base station of the serving cell of UEU2, wherein the steps in block T1 are optional steps.

[0095] for base station N1 , the first wireless signal is sent in step S11, the third wireless signal is received in step S12, and the second wireless signal is sent in step S13. for UE U2 , the first wireless signal is received in step S21, the third wireless signal is sent in step S22, and the second wireless signal is received in step S23.

[0096] In Embodiment 1, the second wireless signal and the first wireless signal correspond to the same upper layer bit packet. The first wireless signal is modulated by the first physical layer bit packet according to the first constellation diagram, the first physical layer bit packet includes L1 first bit groups, the first bit group includes K1 bits, and one first b...

Embodiment 2

[0106] Embodiment 2 illustrates a schematic diagram of the first constellation diagram being 2-dimensional and rotating 16QAM, as shown in the attached figure 2 shown.

[0107] In Embodiment 2, the first constellation diagram is 2-dimensional, and the first constellation diagram is obtained by rotating 16QAM counterclockwise by a first angle. The first modulation symbol is carried (Conveyed) by one resource unit, the K1 in the present invention is 4, and the M1 in the present invention is 16. The M in the present invention is 2, that is, the 16 constellation points in the first constellation diagram are divided into 2 constellation point groups, wherein the 8 constellation points connected by dotted lines belong to one constellation point group, and the remaining 8 constellation points belong to another constellation point group. A set of constellation points.

[0108] In Embodiment 2, the L1 systematic bits in the second wireless signal are respectively used to indicate th...

Embodiment 3

[0111] Embodiment 3 illustrates that the first constellation diagram is 2-dimensional and is a schematic diagram of 16QAM, as shown in the attached image 3 shown.

[0112] In Embodiment 3, the first constellation diagram is 2-dimensional, and the first constellation diagram is 16QAM. The first modulation symbol is carried by one resource unit, the K1 in the present invention is 4, and the M1 in the present invention is 16. The M in the present invention is 4, that is, the 16 constellation points in the first constellation diagram are divided into 4 constellation point groups. The constellation points included in the four constellation point groups are respectively connected by line segments marked {1, 2, 3, 4}.

[0113] In Embodiment 3, the 2*L1 systematic bits in the second wireless signal are used to indicate the constellation point group corresponding to the L1 first modulation symbols, and the L1 first modulation symbols are respectively composed of the L1 modulated by...

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Abstract

The invention discloses a retransmission method and device for wireless communication. The first node sends the first wireless signal in step 1, and sends the second wireless signal in step 2. Wherein, the second wireless signal and the first wireless signal correspond to the same upper layer bit packet. The first wireless signal corresponds to a first physical layer bit packet, the first physical layer bit packet includes L1 first bit groups, and one first bit group corresponds to one first modulation symbol in the first wireless signal. The first modulation symbol is modulated into a constellation point in a first constellation diagram, where the first constellation diagram is N1-dimensional, and the first constellation diagram is composed of M1 constellation points. The M1 constellation points are divided into M constellation point groups. The second wireless signal indicates the constellation point group corresponding to each of the L1 first bit groups. The invention reduces the wireless resource occupied by the retransmission signal and improves the probability of correct decoding.

Description

technical field [0001] The present invention relates to a wireless signal retransmission scheme in a wireless communication system, in particular to a method and device for wireless signal retransmission based on LTE (Long Term Evolution, Long Term Evolution). Background technique [0002] In the traditional 3GPP (3rd Generation Partner Project, third generation partnership project) cellular system and other common wireless communication systems (such as Wifi, Wimax), HARQ (Hybrid Automatic RepeatreQuest, hybrid automatic repeat request) as a key technology is widely adopted. One of the characteristics of HARQ is that the retransmission signal can be self-decoded. However, a problem of HARQ is that the transmitter cannot flexibly adjust the size of the retransmission signal according to the receiving quality of a TB (Transport Block, transport block). Therefore, a multi-level NACK scheme is proposed, for example, using 2 bits to indicate the HARQ_ACK for one TB, among the ...

Claims

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Application Information

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Patent Type & AuthorityPatents(China)
IPC IPC(8): H04L1/00H04L1/18H04L27/34H04W72/04H04W72/12
CPCH04L1/0079H04L1/1816H04L27/3483H04W72/0446H04W72/23
Inventor张晓博
OwnerSHANGHAI LANGBO COMM TECH CO LTD