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Downlink data retransmission judging method and device

A downlink and data technology, applied in the field of downlink retransmission judgment, can solve the problems of NDI disturbance, inaccurate judgment results, adverse impact on HARQ system performance, etc., to achieve the effect of improving performance and ensuring accuracy

Active Publication Date: 2013-07-10
HUAWEI TECH CO LTD
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Problems solved by technology

If there are communication abnormalities such as PDCCH loss or PDCCH false alarm, the order of NDI may be disrupted. If the retransmission of downlink data is still judged according to whether the NDI field has been flipped, the judgment result may be incorrect. Accurate, which in turn will have an adverse effect on the performance of the HARQ system

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  • Downlink data retransmission judging method and device
  • Downlink data retransmission judging method and device
  • Downlink data retransmission judging method and device

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Embodiment Construction

[0036] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention more clear, the embodiments of the present invention will be further described in detail below in conjunction with the accompanying drawings. Here, the exemplary embodiments and descriptions of the present invention are used to explain the present invention, but not to limit the present invention.

[0037] In order to reduce the adverse effects of communication abnormalities such as PDCCH loss or PDCCH false alarm on the performance of the downlink HARQ system, the inventor considers that the LTE protocol (see protocol 3GPP TS36.213V8.6.0) stipulates that: in the downlink resource allocation indication (DCI) In the case of retransmission, the value of the Modulation and Coding Scheme (MCS) field can only be 29, 30 or 31, and the corresponding modulation method is QPSK (Quaternary Phase Shift Keying, Quaternary Phase Shift Keying) , 16QAM (Quadrature Amplitude Mod...

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Abstract

The invention discloses a downlink data retransmission judging method, which comprises: determining the value of the modulation and coding scheme (CMS) field in the downlink control information (DCI) corresponding to received downlink data; and judging if the downlink data is retransmission data according to the value of the MCS field. The invention also discloses a downlink data retransmission judging device. When the method and the device are adopted, the accuracy of the judgment of the retransmission of the downlink data can be ensured, and the performance of the HARQ system can be improved.

Description

technical field [0001] The present invention relates to the field of communication technology, in particular to a downlink retransmission judgment method and device. Background technique [0002] In the LTE (Long Term Evolution, long-term evolution) protocol, the L2 (Layer 2, layer 2) protocol stack includes: PDCP (Packet Data Convergence Protocol, packet data convergence protocol) layer, RLC (Radio Link Control, radio link control) protocol layer , MAC (Media Access Control, Media Access Control) protocol layer. The PDCP layer completes functions such as user plane and control plane data transmission, encryption, integrity protection, and header compression; the RLC protocol layer completes functions such as data packet size matching, including segmentation, cascading, and re-segmentation; the MAC protocol layer completes data Functions such as scheduling, mapping between logical channels and transport channels. [0003] In downlink data transmission, the UE (User Equipme...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L1/18H04L1/00
Inventor 吴远兴蔡志良
Owner HUAWEI TECH CO LTD