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ACK/NACK (acknowledgment/negative-acknowledgment) feedback method for HARQ (hybrid automatic repeat request) under carrier aggregation

A carrier aggregation and bit technology, which is applied in the direction of using the return channel for error prevention/detection, can solve problems such as codeword retransmission, and achieve the effect of reducing the number of codeword retransmissions

Inactive Publication Date: 2011-06-01
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Abstract
  • Description
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Problems solved by technology

This will cause unnecessary codeword retransmission

Method used

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  • ACK/NACK (acknowledgment/negative-acknowledgment) feedback method for HARQ (hybrid automatic repeat request) under carrier aggregation
  • ACK/NACK (acknowledgment/negative-acknowledgment) feedback method for HARQ (hybrid automatic repeat request) under carrier aggregation
  • ACK/NACK (acknowledgment/negative-acknowledgment) feedback method for HARQ (hybrid automatic repeat request) under carrier aggregation

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Embodiment Construction

[0025] The present invention will be further described below in conjunction with the accompanying drawings.

[0026] Technical scheme of the present invention is:

[0027] A method for bundling ACK / NACK feedback under carrier aggregation, based on the maximum utilization of the bundled bits.

[0028] First, the sending end sends data information to the receiving end through M (1≤M≤5) CCs, and the receiving end generates N-bit ACK / NACK control information after checking the received information.

[0029] Secondly, since the UE cannot support N bits under power-limited conditions, it is necessary to bind the A / N information of the N bits into T bits that the UE can support at most. In order to make full use of the information of the T bits , that is, all with 2 T combination means 2 N The situation in , and it is expressed from the least NACK situation (because the probability of being correct in practice is much higher than the probability of being wrong). This not only mak...

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Abstract

The invention relates to an ACK / NACK (acknowledgment / negative-acknowledgment) feedback method for an HARQ (hybrid automatic repeat request) under carrier aggregation, which belongs to the technical field of wireless communication. The transmitting end is firstly used for transmitting data to the receiving end, the receiving end is used for receiving the data, then verifying the data and further returning ACK / NACK to the transmitting end, and the transmitting end is further used for performing transmission of the new data or retransmission of the old data after receiving ACK / NACK information. The number of downlink CC (call controls) can achieve 5 under the LTE-A (long term evolution-advanced) carrier aggregation, thereby needing to feed back more ACK / NACK bit; when UE (user equipment) is under the situation of limited power and the like and can not support the transmission of more ACK / NACK bits, the ACK / NACK bits need to be bound and then re-transmitted, thereby generating the unnecessary code word retransmission. By designing the mapping method from the bits before binding to the bits after binding, code word resources in a channel can be fully utilized, the number of code words which are unnecessary to be retransmitted caused by binding can be reduced, and the reliability of the channel transmission in the process of feeding back the ACK / NACK bits is further enhanced.

Description

Technical field [0001] The invention is a wireless communication technology field, involving A / N binding, channel coding and carrier aggregation. Background technique [0002] With the rapid development of the LTE system, 3GPP gradually carried out research on the related technologies of the LTE-Advanced (LTE-A) system.Compared with the LTE system, the LTE-A system has greatly enhanced key technologies. It introduces carrier aggregate technology (CA), Relay technology, network coding technology, and network MIMO technology. [0003] The reason why the carrier aggregation technology is proposed is that in terms of system bandwidth, LTE-A needs to support the bandwidth of the maximum 100MHz. Because it is difficult to find such a wide range spectrum, carrier aggregation technology is needed.The carrier aggregation technology expands multiple LTE carrier into the transmission carrier of the LTE-A system through aggregation. In this way, the user terminal of the LTE system can use th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L1/16H04L1/18
Inventor 史治平王文涛曾庆展
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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