Error control method for reducing number of automatic retransmission times in Internet of Things environment
An error and remainder technology, applied in the field of Internet of Things communication, can solve problems such as inability to guarantee transmission continuity, consumption of computing resources and battery power of Internet of Things devices, and poor real-time data transmission.
Inactive Publication Date: 2020-05-22
CHINA UNIV OF PETROLEUM (EAST CHINA)
View PDF0 Cites 1 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
However, the shortcomings of automatic retransmission requests are also obvious. The number of automatic retransmission requests is closely related to the status of the channel. Case of retransmission
Therefore, the real-time performance of data transmission is poor, the continuity of transmission cannot be guaranteed, and the transmission efficiency is low.
[0008] The communication environment where IoT devices are located often has various interferences. Frequent retransmissions will not only consume a large amount of computing resources and battery power of IoT devices, but also cause wireless channel congestion, thereby affecting other IoT devices. Communication
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
Embodiment Construction
[0014] Below in conjunction with accompanying drawing, illustrate the embodiment of the present invention, wherein intermediate frame ndframe1, ndframe2, ndframe3, the frame structure of frame is as Figure 4 shown. Steps A, B, C such as figure 2 shown. Steps E, F, G as image 3 shown.
[0015] A. Data frame separation at the sending end: separate the data bits in the original data frame to be sent at the sending end from the original data frame, denote the original data frame from which the data bits are separated as ndframe1, and denote the data bits as databits.
[0016] B. Divide the data bits at the sending end: Divide the databits into 2 parts, which are recorded as highpri-bits and lowpri-bits respectively. The specific division position needs to be determined according to the tolerance range of the specific application scenario. For example, the data bits of a data frame of an application are fixed at 16 bits, and the error tolerance range is 0-7, so the upper 13 ...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More PUM
Login to View More Abstract
The invention provides an error control method for reducing the number of automatic retransmission times in an Internet of Things environment. In a plurality of Internet of Things applications, when data fusion or data analysis is carried out, received data transmitted by a sensor is not required to be completely error-free, i.e., transmission errors in a certain range, such as an urban temperature detection system, are tolerated. Based on the prerequisite, according to the invention, a data frame of a common Internet of Things communication protocol is transformed; data bits are divided intohigh priority bits and low priority bits, CRC checksums of the high priority bits and the low priority bits are calculated respectively, then the two checksums are added into the data frame with the data bits removed, then the CRC checksums are calculated, the checksums are added to the tail of the data frame, and finally the data bits are spliced into the data frame; when the receiving end receives the data frame, only the data bits with high priorities are verified; and if the verification result is correct, it is considered that the transmission is correct, and the data frame is received.
Description
technical field [0001] The invention belongs to the communication field of the Internet of Things, and specifically relates to a method for controlling errors and reducing retransmissions by using a cyclic redundancy check technology in the Internet of Things environment. Background technique [0002] Error refers to the inconsistency between the data received at the receiving end and the data actually sent at the sending end. The cause of the error is the unsatisfactory channel frequency characteristics. Multiplicative interference will cause intersymbol crosstalk and cause bit errors. Various noises can cause additive interference leading to bit errors. In order to reduce the bit error rate to ensure the transmission quality of the communication system, it is necessary to adopt an error control scheme. The purpose of error control is to avoid data transmission errors caused by various reasons, and also to limit transmission errors within the allowable range. [0003] Due...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More Application Information
Patent Timeline
Login to View More Patent Type & Authority Applications(China)
IPC IPC(8): H04L1/00H04L1/08
CPCH04L1/0061H04L1/08
Inventor 徐九韵郝壮远
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)