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Data retransmission method and device

A data retransmission and retransmission technology, which is applied in the field of communication, can solve the problems of retransmission data increasing retransmission time and energy consumption, and achieve the effects of reduced time, reduced energy consumption, and small amount of calculation

Active Publication Date: 2017-10-17
中国兵器装备集团兵器装备研究所
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Problems solved by technology

[0004] The embodiment of the present invention provides a data retransmission method and device to solve the problems of increasing retransmission time and energy consumption in the prior art when retransmitting data

Method used

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  • Data retransmission method and device
  • Data retransmission method and device

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Embodiment Construction

[0043] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments It is a part of embodiments of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

[0044] figure 1 It is a flowchart of a data retransmission method provided by an embodiment of the present invention. Such as figure 1 As shown, the method includes:

[0045] 101. If it is determined that data retransmission is required, obtain the difference between the first intermediate data in the first data packet and the second intermedia...

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Abstract

Embodiments of the present invention provide a data retransmission method and device. The method includes: if it is determined that data retransmission is required, obtaining the difference between the first intermediate data in the first data packet and the second intermediate data to be retransmitted, the first intermediate data being the first intermediate data in the first data packet Other information except the CRC remainder of the cyclic redundancy check; obtain the CRC remainder corresponding to the difference, and obtain the CRC remainder corresponding to the difference according to the CRC remainder in the first data packet and the CRC remainder corresponding to the difference, and obtain the CRC remainder corresponding to the difference to be retransmitted CRC remainder: encapsulating the second intermediate data to be retransmitted and the CRC remainder to be retransmitted according to a predetermined format to obtain a data packet to be retransmitted, and sending the data packet to be retransmitted. The technical scheme of the invention solves the problems of increasing retransmission time and energy consumption in the prior art when retransmitting data.

Description

technical field [0001] Embodiments of the present invention relate to communication technologies, and in particular to a data retransmission method and device. Background technique [0002] In the existing Wireless Fidelity (Wireless Fidelity, referred to as WiFi) system, the media access control (Media Access Control, referred to as MAC) layer adopts the data error detection mechanism of Cyclical Redundancy Check (abbreviated as CRC) , so as to ensure that the receiver can conveniently know whether the received data is correct after transmission through the wireless channel. [0003] When the MAC layer performs Carrier Sense Multiple Access / Collision Avoidance (CSMA / CA) access, if the acknowledgment (ACK) sent by the other party is not received normally, the MAC layer will start the data Retransmission. In order to distinguish the first data from the retransmission data, the Retry field in the frame control field in the packet format defined in the IEEE802.11 standard nee...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L1/16
Inventor 杨晖
Owner 中国兵器装备集团兵器装备研究所
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