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Method for packet retransmission employing feedback information

A technology of feedback information and packet retransmission, applied in the field of packet retransmission, can solve problems such as diversity limitation

Inactive Publication Date: 2010-12-08
LG ELECTRONICS INC
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0019] However, it is limited in obtaining diversity for practical channels where the transmitter does not know the channel information

Method used

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  • Method for packet retransmission employing feedback information
  • Method for packet retransmission employing feedback information
  • Method for packet retransmission employing feedback information

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Embodiment Construction

[0054] Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings. However, it should be understood that various modifications can be made to the following embodiments of the present invention, and the scope of the present invention is not limited to the following embodiments.

[0055] When a wireless system determines a modulation order or a coding rate of an initial packet, channel quality information or channel state information at a location where a packet should be transmitted is required. Channel quality information or channel state information is transmitted through feedback.

[0056] There are several methods of communicating channel information. Among these methods, generally used methods are methods in which a single CQI value calculated for the entire system bandwidth according to a given measurement rule is transmitted, or the transmitter notifies the receiver of the channel state given for packet tran...

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Abstract

A method for packet retransmission employing feedback information is disclosed. The method for packet retransmission employing feedback information comprises receiving reception acknowledgement information from a receiver after a transmitter transmits packets, the reception acknowledgement information representing channel status information and decoding success / failure of the packets; and changing a retransmission mode in accordance with the channel status information if the reception acknowledgement information represents decoding failure, and transmitting retransmission packets of the packets in accordance with the changed retransmission mode. Thus, it is possible to improve decoding probability of the receiver and increase efficiency of retransmission.

Description

technical field [0001] The present invention relates to a method of packet retransmission, more particularly, to a method of packet retransmission using feedback information, in which method, the transmitter changes the retransmission mode and retransmits the packet according to the information fed back from the receiver to enhance the decoding probability of received packets. Background technique [0002] Next-generation communication systems are designed to use wideband frequency bandwidths and increase data rates between transmitters and receivers. In order to construct such a communication system, an OFDM-based modulation mode is mainly used. Examples of wireless communication standards using OFDM-based modulation schemes include 3GPP LTE(+), 3GPP2 UMB(+), IEEE 802.16(d, e, m), IEEE 802.11, IEEE 802.20, IEEE 802.22, and HiperLAN. Examples of user classification schemes in a communication system include an FDMA scheme in which users are categorized based on a frequency ...

Claims

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Application Information

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IPC IPC(8): H04L1/18
CPCH04L5/0007H04L5/0053H04L5/006H04L1/1893H04L1/1671H04L5/0046H04L1/0026
Inventor 卢珉锡权英现郭真三金东哲文诚颢韩承希李玹佑
Owner LG ELECTRONICS INC
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