Method and device for ACK/NACK information indication and data retransmission

A technology of data retransmission and indication signaling, applied in multiplexing communication, using return channel for error prevention/detection, electrical components, etc., can solve problems such as waste of resources, inapplicability of TDD system, etc., to save time and frequency The effect of resources

Inactive Publication Date: 2009-04-29
HUAWEI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] In the process of implementing the present invention, the inventors found that there are at least the following problems in the prior art: due to the difference in the physical layer structure between FDD and TDD, the two methods of obtaining the ACK / NACK of the corresponding uplink subframe of the user in the prior art are only suitable Used in FDD systems, not suitable for TDD systems
However, under normal circumstances of actual use, there will be a great waste of resources, that is, on the basis of the resources reserved by FDD, 6 times the resources are reserved in the TDD system

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  • Method and device for ACK/NACK information indication and data retransmission
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  • Method and device for ACK/NACK information indication and data retransmission

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Embodiment Construction

[0018] Below in conjunction with accompanying drawing and embodiment, the specific embodiment of the present invention is described in further detail:

[0019] Taking the 5MHz bandwidth in the TDD system as an example, the number of effective subcarriers is 300, and the downlink control signaling is distributed on the first three OFDM symbols of a downlink subframe. Assuming that uplink resources are allocated in frame structure 2, 2 / 3 coding rate, QPSK demodulation, it can be assumed that each user's UL grant occupies one CCE, and each CCE occupies 36 REs (Resource Element, resource block), PFICH (PhysicalFormat ARQ Indication Channel, Physical Format Retransmission Request Indication Channel) The channel occupies 16 REs. In the case of a single antenna, in the first OFDM symbol of each downlink subframe, there will be 1 pilot symbol in every 6 subcarriers . The flow of a data retransmission method in an embodiment of the present invention is as follows: figure 1 shown, inc...

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Abstract

The present invention provides a data re-transmitting method comprising the steps of firstly, sending ascending transmission resource indication signaling by a sender, wherein, the ascending transmission resource indication signaling is provided with an ACK / NACK begin index domain; secondly, according to the ACK / NACK begin index domain and ascending index of the ascending transmission resource indication signaling, obtaining corresponding ACK / NACK information by a receiver; finally, performing data re-transmission according to the corresponding ACK / NACK information. The present invention also discloses a sender and a receiver of the device for ACK / NACK information indication and data re-transmission and a indication method of the ACK / NACK information. According to the present invention, by using the ascending transmission resource indication signaling provided with an ACK / NACK begin index domain, ACK / NACK information of ascending sub-frames corresponding to users can be obtained, therefore, time-frequency resources of the system can be saved.

Description

technical field [0001] The present invention relates to the technical field of wireless communication, in particular to a method and device for indicating ACK / NACK information and data retransmission. Background technique [0002] With the rapid development of wireless communication technologies, LTE (Long Term Evolution, Long Term Evolution) is widely used. In the LTE system, two modes of FDD (Frequency Division Duplex, frequency division duplex) and TDD (Time Division Duplex, time division duplex) are adopted to implement an air interface manner. In the TDD mode, reception and transmission are performed in different time slots of the same frequency channel, and the uplink and downlink subframe ratios are flexibly allocated according to different service flows. In the FDD mode, the system receives and transmits on two separate symmetrical frequency channels, and uses the guaranteed frequency band to separate the receiving and transmitting channels. All subframes on the fre...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L1/18H04J3/16
Inventor 吕永霞李博
Owner HUAWEI TECH CO LTD
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