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Relaying method for uplink data retransmission and mobile communication system

A mobile communication system and data retransmission technology, applied in the field of transparent relay, can solve the problems of correct reception delay of big data, no cooperative diversity gain, unable to obtain cooperative diversity gain, etc., and achieve high signal-to-noise ratio and good channel estimation. The effect of accuracy

Inactive Publication Date: 2011-05-18
NTT DOCOMO INC
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0031] No cooperative diversity gain, since only user terminals or relay stations do retransmissions, so cooperative diversity gain cannot be obtained
[0032] In addition, when the channel from the user terminal to the base station is poor and the channel from the relay station to the base station is good, Fujitsu's solution usually causes a large delay in correct data reception because it prioritizes the retransmission of the user terminal

Method used

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  • Relaying method for uplink data retransmission and mobile communication system
  • Relaying method for uplink data retransmission and mobile communication system
  • Relaying method for uplink data retransmission and mobile communication system

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Embodiment Construction

[0083] In the embodiment of the present invention, when the uplink data is retransmitted, the user terminal and the relay station send reference signals with different cyclic shift values ​​on the same resource, so that the base station can perform signal detection based on the different reference signals sent by the user terminal and the relay station.

[0084] The relay method during uplink data retransmission according to the embodiment of the present invention includes:

[0085] In the first receiving step, the base station receives the uplink data retransmitted by the user terminal on the first resource based on the NACK signal, the first reference signal, and the control information embedded in the uplink data;

[0086] In the second receiving step, the base station receives one of the uplink data sent by the relay station on the first resource based on the NACK signal or the uplink data after precoding the uplink data, and a second reference signal; the second reference ...

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Abstract

The invention provides a relaying method for uplink data retransmission and a mobile communication system. The transparent relaying method comprises the following steps: a base station receives uplink data, a first reference signal and control information embedded into the uplink data, which are retransmitted on a first resource by a user terminal based on a NACK (Negative Acknowledgement) signal; the base station receives the uplink data or the precoded uplink data and a second reference signal, which are transmitted on the first source by a relaying station based on the ANCK signal, wherein the second reference signal is different from the first reference signal; and the base station calculates channel response by utilizing the first reference signal, the second reference signal and the received signals and detects the control information and the uplink data by using the calculation result of channel response. According to the invention, cooperative diversity gain is obtained on the basis of correctly transmitting the control information and the uplink data.

Description

technical field [0001] The invention relates to the technical field of transparent relay, in particular to a relay method and a relay station when uplink data is retransmitted. Background technique [0002] The process of transparent relay used to assist uplink data retransmission is as follows: figure 1 shown, including: [0003] Step 11, the user terminal sends uplink data to the base station; due to the openness of the wireless channel, the relay station can also receive the uplink data and control information of the user terminal. Because the relay station is usually closer to the user terminal, the probability of the relay station successfully receiving the user terminal data is greater than that of the base station; [0004] Step 12, the base station detects the received uplink data sent by the user terminal, and if it is correct, feeds back ACK to the user terminal, and if not, feeds back NACK to the user terminal; [0005] Step 13, after receiving the NACK signal ...

Claims

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Application Information

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IPC IPC(8): H04L1/18
Inventor 李安新闫渊高新颖加山英俊
Owner NTT DOCOMO INC
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