Retransmission method and retransmission device in mobile communication

A technology of wireless communication and wireless signal, which is applied in the field of wireless signal retransmission based on LTE, and can solve problems such as flexible adjustment of retransmission signal size

Active Publication Date: 2017-01-04
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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  • Retransmission method and retransmission device in mobile communication
  • Retransmission method and retransmission device in mobile communication
  • Retransmission method and retransmission device in mobile communication

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0091] 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 maintaining base station of the serving cell of UE U2, wherein the steps in block T1 are optional steps.

[0092] 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.

[0093] In Embodiment 1, the second wireless signal and the first wireless signal correspond to the same upper layer bit packet. The first wireless signal includes a signal generated by modulation of a first physical layer bit packet, the first physical layer bit packet includes L1 bit groups, the bit group includes K1 bits, and the bit group is modulated into W One o...

Embodiment 2

[0101] Embodiment 2 illustrates that the modulation state is a schematic diagram of a point in a 4-dimensional space, as attached figure 2 shown.

[0102] In Embodiment 2, the modulation state in the present invention is carried by two resource units, and the projection of the modulation state in the I / Q plane corresponding to each resource unit is a constellation point in the 4QAM constellation diagram. attached figure 2 (a) and attached figure 2 (b) respectively illustrate the possible projection positions of the modulation state on the I / Q plane on 2 resource units, where the numbers of the 4QAM constellation points on the 2-dimensional I / Q plane are respectively {1, 2, 3, 4}. In this embodiment, (e, r) indicates that the projections of the constellation points on the I / Q plane on two resource units have respective constellation point numbers e and r, as shown in the attached figure 2 shown.

[0103] As sub-embodiment 1 of embodiment 2 , the V in the present inve...

Embodiment 3

[0116] Embodiment 3 illustrates the flow chart of uplink retransmission in LTE system, as attached image 3 shown. attached image 3 In , the base station N3 is the maintenance base station of the serving cell of the UE U4.

[0117] for UE U4 , the second wireless signal is sent in step S41, the sixth wireless signal is received in step S42, and the fifth wireless signal is sent in step S43. for base station N3 , the second wireless signal is received in step S31, the sixth wireless signal is sent in step S32, and the fifth wireless signal is received in step S33.

[0118] In Embodiment 3, the second radio signal and the first radio signal (sent by the UE U4 to the base station N3 before the second radio signal) correspond to the same upper layer bit packet. The first wireless signal includes a signal generated by modulation of a first physical layer bit packet, the first physical layer bit packet includes L1 bit groups, the bit group includes K1 bits, and the bit group i...

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Abstract

The invention discloses a retransmission method and a retransmission device in mobile communication. A first node transmits a first wireless signal in a first step, and transmits a second wireless signal in a second step, wherein the first wireless signal comprises a signal which is generated through modulating a first physical layer bit package. The first physical layer bit package comprises L1 bit sets. The bit sets are modulated to one in W modulation states. The W modulation states are divided into W1 modulation state sets. The second wireless signal indicates the modulated state set to which the modulated state that corresponds with each of the L1 bit sets belongs. The least Euclidean distance between two modulated states in the modulated state set is larger than the least Euclidean distance between the two modulated states in the W modulated states. The retransmission method and the retransmission device have advantages of reducing wireless resource which is occupied in signal retransmission and improving 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 Repeat reQuest, 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 & Authority Applications(China)
IPC IPC(8): H04L1/18H04L1/06
Inventor 张晓博
Owner SHANGHAI LANGBO COMM TECH CO LTD
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