KR20170115356A - METHOD FOR PROCESSING A RECEIVED DATA IN AN IoT NETWORK - Google Patents

Abstract

The present invention relates to a method for processing received data in a system for wireless data communication with an IoT terminal and an IoT communication system,
Phase and quadrature data from the IoT terminal through a wireless channel and performs channel decoding on the channel decoded data and performs integrity verification on the channel decoded data, and performs integrity verification on the channel decoded data based on the integrity verification result, IoT base stations for generating and transmitting a packet including phase data,
And a controller for receiving packets generated from the IoT base stations and collecting packets transmitted from the same IoT terminal, and if one or more integrity-checked packets exist among the collected packets, And transmits the application server transmission packet after the integrity verification. If the integrity-verified packet does not exist, the in-phase and quadrature-phase data of a packet having a frame detection value exceeding a preset threshold value are summed and channel decoded And an IoT network server for generating and transmitting an application server transport packet.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an Internet communication system,

Field of the Invention [0002] The present invention relates to a wireless communication network, and more particularly, to a method of processing received data in a system for wireless data communication with an IoT terminal and an IoT communication system.

The wireless communication system evolved from the first generation system of analog system to the GSM and IS-95 system which improved the system capacity by applying digital TDMA (time division multiple access) technology and CDMA (code division multiple access) Respectively.

This trend continues, and a third generation (WCDMA) system designed to enable packet data service through a wireless communication network has been developed. In the fourth generation LTE system, the transmission rate of wireless data is improved to a level close to the wired network. That is, the development process of the wireless communication technology can be summarized as maximizing the wireless data transmission speed while increasing the efficiency of using the wireless resources.

In recent years, IoT technology has become popular for providing Internet connectivity to small devices. The IoT terminal can be roughly classified into a terminal connected to the Internet through a wired line and a terminal connected to the Internet through a wireless line.

IoT terminals generally use Zigbee, Bluetooth and WiFi technologies when the transmission length of a wireless section is short such as an office. If the length of the wireless section is long, the mobile communication network such as the LTE network is used. However, since the mobile communication network is designed to efficiently transmit a large amount of data, the operation is complicated and the power consumption is high, and the application range of the IoT application is limited.

In order to solve such a problem, LoRa and Sigfox, which are low power long range wireless communication systems with long transmission distance and small power consumption of terminals, are used.

Unlike previous wireless communication terminals, the IoT terminal should have low power consumption so that it can operate for a long time without replacing the battery. In the IoT terminal, most of the consumed power is consumed in the standby state. In addition, most of the power consumed in the standby state is consumed in the wireless communication circuit. Therefore, it is important to simplify the operation of the terminal in the standby state.

The IoT terminal sends most of the time in the inactive state and periodically enters the active state to check whether there is data transmitted from the base station. Also, if there is data to be transmitted, it is transmitted to the IoT base station. At this time, the IoT terminal transmits data without designating the IoT base station to receive the signal. This minimizes the power consumption by preventing the IoT terminal from performing the operation of searching for the base station having the best radio state when it enters the active state from the inactive state.

One data transmitted from the IoT terminal is received by a plurality of base stations since the receiving base station is not determined. The base stations process the received data, restore it to user data, and transmit the result to a network server.

The network server receives the processing result of one data transmitted from the IoT terminal from the various base stations. The network server selects the packet having the highest quality among the received data and transmits it to the application server. That is, only one packet among a plurality of packets received by the IoT network server is used for data reception and the rest is discarded.

Therefore, even if a packet having the highest quality among the received data is selected, if the selected packet includes an error or some data is lost, the IoT terminal must retransmit the data. Since this is a factor that accelerates the power consumption of the IoT terminal, a new scheme that minimizes the number of retransmissions is needed.

Also, if the probability of successful data transmission increases, the data transmission strength of the IoT terminal can be reduced, and consequently, the power consumption of the IoT terminal can be minimized.

Accordingly, the present applicant has come up with a method of increasing the probability of data transmission success by accumulating all data received from a plurality of base stations in order to minimize power consumption of the IoT terminal.

Korean Patent Registration No. 10-1555315

An object of the present invention is to provide an IoT base station and an IoT base station capable of minimizing the number of data retransmissions of an IoT terminal by increasing the probability of data transmission success by accumulating data received from a plurality of base stations. A method for processing received data in each network server,

It is still another object of the present invention to provide a method for processing received data in an IoT base station and an IoT network server capable of minimizing terminal power consumption by reducing data transmission strength of the IoT terminal.

Still another object of the present invention is to provide an IoT communication system capable of increasing the probability of data transmission success transmitted from an IoT terminal.

According to an aspect of the present invention, there is provided an IoT communication system including:

Phase and quadrature data from the IoT terminal through a wireless channel and performs channel decoding on the channel decoded data and performs integrity verification on the channel decoded data, and performs integrity verification on the channel decoded data based on the integrity verification result, IoT base stations for generating and transmitting a packet including phase data;

And a controller for receiving packets generated from the IoT base stations and collecting packets transmitted from the same IoT terminal, and if one or more integrity-checked packets exist among the collected packets, And transmits the application server transmission packet after the integrity verification. If the integrity-verified packet does not exist, the in-phase and quadrature-phase data of a packet having a frame detection value exceeding a preset threshold value are summed and channel decoded And an IoT network server for generating and transmitting an application server transmission packet,

Each of the IoT base stations includes:

Phase and quadrature-phase data from the IoT terminal and performs channel decoding processing. The frame detection time and the frame detection result value are extracted with respect to the received in-phase and quadrature data and included in a packet including the channel-decoded data Another characteristic of Sikkim,

Each of the IoT base stations includes:

Phase and quadrature-phase data from the IoT terminal and performs channel decoding on the received in-phase and quadrature data, extracting a frame detection time, a frame detection result value, and a frame header start point information on the received in- In the packet including the packet.

Further, the IoT network server in the above-mentioned IoT communication system,

And if there is more than one packet that has passed the integrity verification, selects a packet having the largest frame detection result value included in each packet and decodes the packet.

Furthermore, the IoT network server,

IoT base stations, and collects and processes the packets transmitted from the same IoT terminal.

Meanwhile, the received data processing method in the IoT communication system according to the embodiment of the present invention is a method executable in the IoT base station,

Receiving in-phase and quadrature data from an IoT terminal over a wireless channel;

Performing channel decoding on received data through frame detection, synchronization, and channel estimation;

Performing integrity verification on the channel decoded data;

And generating a packet including the channel decoded data or a packet including the in-phase and quadrature data according to the integrity verification result and transmitting the generated packet to the IoT network server.

The packet including the channel-decoded data may include,

And a frame detection time and a frame detection result value for the in-phase and quadrature data extracted in the channel decoding step are included together.

In addition, in the packet including the in-phase and quadrature data,

A frame detection result, and a frame header start point information for the in-phase and quadrature data extracted in the channel decoding step are included together.

Further, the received data processing method in the IoT communication system according to another embodiment of the present invention is a method executable in the IoT network server,

Receiving packets transmitted from IoT base stations and collecting packets transmitted from the same IoT terminal;

Generating and transmitting an application server transmission packet after channel verification and integrity verification for one of the collected packets if one or more integrity-checked packets exist;

And if the integrity-verified packet does not exist, in-phase and quadrature-phase data of a packet having a frame detection value exceeding a preset threshold value are summed and channel decoded, and then an application server transmission packet is generated and transmitted And,

And if there is one or more integrity-verified packets, selects a packet having a largest frame detection result value included in each packet to decode the channel.

In the step of collecting packets transmitted from the same IoT terminal, the reception time of the packet transmitted from the IoT base stations is checked to collect packets processed from the same IoT terminal.

According to the above-mentioned problem solving means, in the IoT network server of the present invention, since the I / Q data that has not passed the integrity verification is cumulatively processed, the probability of data transmission success is relatively increased, And the battery life can be extended.

Also, if the probability of successful data transmission increases, the data transmission strength of the IoT terminal can be reduced, and as a result, the power consumption of the IoT terminal can be minimized.

1 is a diagram illustrating an example of the configuration of an IoT system as an example of a wireless communication network according to an embodiment of the present invention.
2 is an illustration of a received data frame according to an embodiment of the present invention.
3 is a diagram illustrating an example of a received data processing flow in an IoT base station according to an embodiment of the present invention.
4 is a diagram illustrating an example of the flow of received data processing in the IoT network server according to the embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear. Among the terms used below, packet and frame are used in combination, but they are interpreted in the same sense.

1 is a block diagram of an IoT system as an example of a wireless communication network according to an embodiment of the present invention. FIG. 2 shows a received data packet according to an embodiment of the present invention. And IoT base station 110 according to the first embodiment of the present invention.

As shown in FIG. 1, the IoT system according to the embodiment of the present invention includes a plurality of IoT terminals 100 for transmitting data on a wireless channel, and the IoT base station 110 includes IoT terminals 100 And periodically receives I / Q data. The IoT base station 110 detects a packet from the received I / Q data.

In more detail, each of the IoT base stations 110 receives in-phase and quadrature-phase data from the IoT terminal 100 through a wireless channel and performs channel decoding on the channel decoded data, And generates and transmits a packet including the channel decoded data or a packet including the in-phase and quadrature data (I / Q data) according to the integrity verification result.

Each of the IoT base stations 110 receives in-phase and quadrature (I / Q) data from the IoT terminal 100 and performs channel decoding processing on the received in-phase and quadrature data, Extracts the resultant value, and stores the resultant value in a packet including the channel-decoded data.

Each of the IoT base stations 110 receives the in-phase and quadrature data from the IoT terminal 100 and performs channel decoding on the received in-phase and quadrature data, Extracts start point information, and includes the same in the packet including the in-phase and quadrature data.

Meanwhile, the IoT network server 120 receives the packet generated and transmitted by the IoT BSs 110, collects the packets transmitted from the same IoT terminal 100, and transmits the integrity-verified packet And transmits the application server transmission packet to the application server when the integrity check packet is not present. If there is no packet that has passed the integrity check, the application server transmits a packet detection value exceeding a preset threshold value (I / Q) data of the packet and channel-decodes the packet, and then generates an application server transmission packet and transmits it to the application server 130.

The IoT network server 120 selects and decodes a packet having the largest value of the frame detection result value included in each packet when there is one or more integrity verified packets.

The IoT network server 120 checks the reception time of the packet transmitted from the IoT base stations 110 and collects and processes the packets transmitted from the same IoT terminal.

The application server 130, which is not illustrated in FIG. 1, controls the IoT terminals 100 or provides a predetermined service based on the received data.

The detection of a packet (frame) performed in the IoT base station 110 is performed using a preamble attached to the beginning of a received data packet as shown in FIG. A preamble is a data sequence in which an auto-correlation value is an impulse function is repeated several times. If the length of a data string used in the preamble is L, an example of an operation used for packet detection can be expressed as Equation (1).

In this example, the IoT BS 110 determines that a frame is detected when the value of the frame detection result D (n) is larger than a predetermined threshold value. The value of D (n) is utilized as a criterion for determining the quality of the received signal. If the value of D (n) is high, the quality of the signal is high, while if it is low, the quality is low.

A general procedure for channel decoding by the IoT base station 110 will be described in further detail. If the frame detection result D (n) obtained based on Equation (1) has a value larger than the threshold value, do. The synchronization process is needed to find out where the starting point of the data to process in the detected frame is. In the synchronization process, the IOT base station 110 extracts the frame header starting point information and uses it later. When a starting point of the data is found, a channel decoding process is performed to estimate a wireless channel, to reflect a characteristic of a wireless channel, to perform a demodulation process, and to recover an error included in received data.

The process of processing received data in the IoT base station 110 including the channel decoding process will be described with reference to FIG. 3,

First, each of a plurality of IoT base stations 110 receives in-phase and quadrature data I / Q from one IoT terminal 100 through a wireless channel (step S10). Then, as described above, the frame is detected from the received data using Equation (1), and a synchronization process is performed. In this frame detection process, the frame detection result value D (n) can be obtained and the frame detection time can be extracted (step S20). Then, frame header starting point information is extracted through a synchronization process (step S30).

Thereafter, the IoT BS 110 estimates a wireless channel, performs a demodulation process reflecting the characteristics of the wireless channel (S40), and performs a channel decoding process (S50) for recovering an error included in the received data.

Then, integrity verification, i.e., CRC (Cyclic Redundancy Check) checking is performed on the channel decoded data to check whether integrity verification has passed or not (S60).

The data that has passed the integrity verification can be determined to have been processed without error. Accordingly, when the IoT base station 110 passes the integrity verification, the IoT base station 110 transmits the frame detection time for the in-phase and quadrature data extracted in the channel decoding step to the packet including the channel decoded data (i.e., the data for which the integrity verification is completed) (Step S70), and transmits the generated packet to the IO network server 120 (step S90).

If the IoT BS 110 does not pass the integrity check, the IoT BS 110 generates a packet including the in-phase and quadrature (I / Q) data in step S80 and transmits the packet to the IoT network server in step S90 In a packet including in-phase and quadrature data,

A frame detection result, and a frame header start point information for the in-phase and quadrature data extracted in the channel decoding step.

For reference, if the integrity test for data can not be passed, the IoT BS 110 may generate and transmit a packet only when the frame detection result value is larger than a preset threshold value. This is because, if the frame detection result value is too low, the probability of successful signal decoding is low.

Hereinafter, the operation of the IoT network server 120 for post-processing the packet data transmitted from the IoT base station 110 will be described in detail with reference to FIG.

FIG. 4 illustrates a flowchart of received data processing in the IoT network server 120 according to an embodiment of the present invention.

Referring to FIG. 4, the IoT network server 120 receives a packet from several IoT base stations 110 connected under the IoT network server 120. To confirm that the packets transmitted from one terminal are repeatedly received through different base stations, information such as the reception time and the base station ID is checked. Thereby collecting packets transmitted from one IoT terminal 100.

That is, the IoT network server 120 receives packets transmitted from the IoT BSs 110 (step S110), and collects packets transmitted from the same IoT terminals (step S120). It is possible to collect packets processed from the same IoT terminal by checking the reception time of the packet transmitted from the IoT base stations 110.

When the packet collection is completed, the IoT network server 120 determines whether one or more integrity-checked packets exist among the collected packets (S130 and S140). If the integrity verification has passed one or more packets, a packet having the largest value of the frame detection result value D (n) included in each packet is selected (step 140), and the selected packet is subjected to channel decoding and integrity verification And generates an application server transmission packet in step S150. Then, the generated application server transmission packet is transmitted to the application server 130 side (step S160).

If no integrity validated packet exists, the IoT network server 120 selects packets having a frame detection value exceeding a preset threshold value (step S170), and then outputs the in-phase and quadrature (I / Q) data (Step S180) to perform channel estimation and channel decoding (step S190), and then generates an application server transmission packet (step S150).

The application server transmission packet is transmitted to the application server 130 in step S160.

As described above, if the I / Q data that has not passed the integrity verification in the IoT network server 120 is cumulatively processed, the probability of data transmission is relatively increased, so that the power consumption of the IoT terminal 100 is reduced And the effect of extending the battery usage time can be obtained.

In addition, if the probability of data transmission is high, the data transmission strength of the IoT terminal 100 can be reduced, and as a result, the power consumption of the IoT terminal 100 can be minimized.

While the invention has been shown and described with reference to certain embodiments thereof, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined by the appended claims.

Claims (11)

Phase and quadrature data from the IoT terminal through a wireless channel and performs channel decoding on the channel decoded data and performs integrity verification on the channel decoded data, and performs integrity verification on the channel decoded data based on the integrity verification result, IoT base stations for generating and transmitting a packet including phase data;
And a controller for receiving packets generated from the IoT base stations and collecting packets transmitted from the same IoT terminal, and if one or more integrity-checked packets exist among the collected packets, And transmits the application server transmission packet after the integrity verification. If the integrity-verified packet does not exist, the in-phase and quadrature-phase data of a packet having a frame detection value exceeding a preset threshold value are summed and channel decoded And an IoT network server for generating and transmitting an application server transport packet. 2. The base station of claim 1,
Phase and quadrature-phase data from the IoT terminal and performs channel decoding processing. The frame detection time and the frame detection result value are extracted with respect to the received in-phase and quadrature data and included in a packet including the channel-decoded data IoT communication system. 2. The base station of claim 1,
Phase and quadrature-phase data from the IoT terminal and performs channel decoding on the received in-phase and quadrature data, extracting a frame detection time, a frame detection result value, and a frame header start point information on the received in- In the packet including the < RTI ID = 0.0 > IoT < / RTI > communication system. 4. The IoT network server according to any one of claims 1 to 3,
Wherein if one or more integrity-verified packets exist, a packet having the largest value of the frame detection result included in each packet is selected and channel-decoded. 4. The IoT network server according to any one of claims 1 to 3,
Wherein the IoT base station checks the reception time of the packet transmitted from the IoT base stations and collects the packets transmitted from the same IoT terminal. 1. A received data processing method executable by an IoT base station,
Receiving in-phase and quadrature data from an IoT terminal over a wireless channel;
Performing channel decoding on received data through frame detection, synchronization, and channel estimation;
Performing integrity verification on the channel decoded data;
And generating a packet including the channel decoded data or a packet including the in-phase and quadrature data according to a result of the integrity verification and transmitting the generated packet to the IoT network server. Processing method. 7. The method of claim 6, wherein the packet including the channel-
And a frame detection time and a frame detection result value for the in-phase and quadrature data extracted in the channel decoding step are included together in the IoT base station. 7. The method of claim 6, wherein the packet including the in-
A frame detection result value, and a frame header start point information for the in-phase and quadrature data extracted in the channel decoding step are included together in the IoT base station. A method of processing received data executable on an IoT network server,
Receiving packets transmitted from IoT base stations and collecting packets transmitted from the same IoT terminal;
Generating and transmitting an application server transmission packet after channel verification and integrity verification for one of the collected packets if one or more integrity-checked packets exist;
And if the integrity-verified packet does not exist, in-phase and quadrature-phase data of a packet having a frame detection value exceeding a preset threshold value are summed and channel decoded, and then an application server transmission packet is generated and transmitted Wherein the IoT network server comprises: The method as claimed in claim 9, wherein if there is more than one integrity-verified packet, a packet having a largest frame detection result value included in each packet is selected and channel-decoded. Processing method. The method of claim 9, wherein collecting the packets transmitted from the same IoT terminal comprises collecting packets transmitted from the same IoT terminal by checking reception times of packets transmitted from the IoT base stations, A method for processing received data in a server.

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