WO2018026040A1

WO2018026040A1 - Method for controlling internal collision avoidance type wireless communication channel shift in hybrid terminal apparatus

Info

Publication number: WO2018026040A1
Application number: PCT/KR2016/008721
Authority: WO
Inventors: 김철민; 박금준
Original assignee: 가온미디어 주식회사
Priority date: 2016-08-04
Filing date: 2016-08-09
Publication date: 2018-02-08
Also published as: KR101777686B1

Abstract

The present invention relates to a technology for performing a control to efficiently perform a channel shift for channel interference cancellation in a frequency band commonly used by a plurality of wireless communication modules in a hybrid terminal apparatus. More specifically, the present invention relates to a technology for preventing a situation of shifting to the same channel internally by adjusting a shift target channel of wireless communication modules mounted on a hybrid terminal apparatus when the plurality of wireless communication modules shift channels for channel interference cancellation, such that the wireless communication modules can quickly complete the channel shift and effectively transmit and receive data.

Description

Internal Collision Avoidance Wireless Communication Channel Shift Control Method in Hybrid Terminals

The present invention relates to a technology for controlling channel shift for efficiently eliminating channel interference in a frequency band commonly used by a plurality of wireless communication modules in a hybrid terminal device.

More specifically, the present invention provides a situation in which a plurality of wireless communication modules mounted in the hybrid terminal device shift to the same channel internally by adjusting the shift target channel of the wireless communication modules when the channel is shifted to eliminate channel interference. It is about a technology that enables the wireless communication module to quickly complete the channel shift and effectively transmit and receive data.

In general, wireless LAN (for example, Wi-Fi) communication uses the 2.4 GHz and 5 GHz bands, Bluetooth communication uses the 2.4 GHz band, and Zigbee communication uses the 2.4 GHz, 868 MHz, and 915 MHz bands. .

Here, the 2.4 GHz band is an Industrial Scientific and Medical (ISM) band, which is used by all of WLAN, Zigbee, and Bluetooth.

However, in IoT technology, since IoT sensors are built based on Bluetooth and Zigbee, it is expected that a plurality of IoT sensors will be installed in a certain space when IoT technology is introduced in earnest. Accordingly, these IoT sensors need to harmoniously use the 2.4 GHz band, which is the ISM band.

In addition, a wireless LAN access point (AP) is installed in offices and homes, and a plurality of wireless LAN APs of public institutions are installed. As a result, the wireless traffic generated by the wireless LAN communication in the 2.4 GHz band is also considerable.

As such, the 2.4 GHz band is utilized by all of WLAN, Zigbee, and Bluetooth, and interference between devices using these wireless communication technologies occurs. This interference phenomenon is predicted from the beginning due to the nature of the ISM band, and the wireless communication device detects such interference phenomenon through frequency shift. This operation is called dynamic frequency shift (DFS).

In the conventional dynamic frequency shift, the basic concept is that a wireless communication device that detects an interference phenomenon shifts its wireless communication frequency to another new channel instead of a channel originally intended to be used. If the new channel is suitable for wireless communication, the channel is used. If interference occurs in the channel, the channel moves back to another channel. This operation is repeated until a channel suitable for wireless communication is found.

So far, the congestion of the ISM band can be tolerated, so it was possible to operate even with this frequency shift method.

However, in the near future, when the smart home era or the smart office era arrives, an environment in which a large number of IoT sensors and several WLAN APs are concentrated in a narrow space will be achieved. In such a situation, the frequency shift will operate inefficiently in the conventional method, and it will be difficult for the wireless communication devices to perform data transmission and reception smoothly.

Accordingly, in such a situation, there will be a need for a technique capable of more efficiently performing frequency shift operations that solve channel interference in a frequency band commonly used by various wireless communication technologies.

Prior art documents related to the present invention are as follows.

(1) Korean Patent Application No. 10-2009-0002397 "Wireless Communication Channel Control Method and System"

(2) Korean Patent Application No. 10-2005-0107553 "Wireless communication channel quality maintenance method and wireless communication device using the same"

(3) Korean Patent Application No. 10-2013-0012619 "Method and system for operating wireless communication channel of mobile terminal"

(4) Korean Patent Application No. 10-2005-0046280 "Wireless communication system and method for preventing mutual interference between wireless communication channels"

The present invention has been proposed in view of the above, and an object of the present invention is to efficiently perform channel shift for canceling channel interference in a frequency band commonly used by a plurality of wireless communication modules in a hybrid terminal device. It is to provide technology to control.

Particularly, an object of the present invention is to prevent a situation of shifting to the same channel internally by adjusting shift target channels of wireless communication modules when a plurality of wireless communication modules mounted in a hybrid terminal device shift a channel for channel interference cancellation. It is to provide a technology that allows a wireless communication module to complete a channel shift quickly and effectively transmit and receive data.

In order to achieve the above object, the present invention provides a shift of a wireless communication channel for solving channel interference in a common frequency band commonly used by a plurality of wireless communication modules in a hybrid terminal including a main processor and a plurality of wireless communication modules. A method of controlling to perform a while avoiding internal collision, comprising: (a) setting a control channel for managing channel shift between a main processor and a plurality of wireless communication modules; (b) a plurality of wireless communication modules setting wireless communication channels to perform wireless communication; (c) collecting, by the main processor, frequency local usage by the plurality of wireless communication modules; (d) detecting a channel interference event by a specific wireless communication module (hereinafter, referred to as an 'x wireless communication module') of the plurality of wireless communication modules; (e) a main processor for managing an internal target such that the x-th wireless communication controller controlling the x-th wireless communication module controls the next target channel to be applied to the channel shift for canceling channel interference in consideration of frequency local use. Setting with permission; (f) the x-th wireless communication module performing a shift to a next target channel; (g) updating, by the main processor, the frequency local use status to reflect the next target channel.

An internal collision avoidance wireless channel shift control method according to the present invention is performed between step (f) and step (g), wherein (h) generation of frequency collision in the next target channel is performed by the x-th wireless communication module after channel shift. Checking whether or not; (i) if it is determined that a frequency collision has occurred in the next target channel as a result of checking in step (h), proceeding to step (e) to reset the next target channel and retry channel shifting; (j) if it is determined that the frequency collision does not occur in the next target channel as a result of checking in step (h), the process proceeds to step (g).

Also, in the present invention, step (e) may include (e-1) selecting a next candidate channel for canceling channel interference as a channel having a different frequency within the bandwidth of the corresponding wireless communication technology; (e-2) the x-th wireless communication controller providing a next candidate channel to the main processor; (e-3) checking, by the main processor, whether the next candidate channel has an internal collision compared to the frequency local use status; (e-4) the main processor providing an internal collision check result of the next candidate channel to the xth wireless communication controller; (e-5) If it is determined that an internal collision occurs in the next candidate channel as a result of checking in step (e-3), the x-th wireless communication controller reselects the next candidate channel for channel interference cancellation and proceeds to step (e-2). Doing; (e-7) If it is determined that the internal collision does not occur in the next candidate channel as a result of checking in step (e-3), the x-th wireless communication controller sets the next candidate channel avoiding frequency internal collision as the next target channel. It is preferable that it is comprised, including.

In addition, in step (c), it is preferable that the main processor collects the frequency local use status in the common frequency band by the plurality of wireless communication modules.

On the other hand, the computer-readable recording medium according to the present invention records a program for executing the internal collision avoidance wireless communication channel shift control method in the hybrid terminal device as described above.

The present invention can avoid the internal collision when the plurality of wireless communication modules mounted in the hybrid terminal device to perform the channel shift to eliminate the channel interference, so that the channel shift can be completed quickly, and thus the wireless communication module This shows the advantage of smoothly transmitting and receiving data.

1 is a block diagram of a hybrid terminal device suitable for applying the internal collision avoidance wireless communication channel shift control method according to the present invention.

2 is a view showing a channel configuration of a wireless LAN in the 2.4 GHz band.

3 is a diagram showing a channel configuration of a wireless LAN, Bluetooth, ZigBee in the 2.4 GHz band.

Figure 4 is a flow chart showing the overall process of the wireless communication channel shift control method of a hybrid terminal device according to the present invention.

5 is a flowchart illustrating a process of setting a next target channel in the present invention.

Hereinafter, the present invention will be described in detail with reference to the drawings.

1 is a block diagram of a hybrid terminal device 100 suitable for applying an internal collision avoidance wireless communication channel shift control method according to the present invention.

Referring to FIG. 1, the hybrid terminal 100 includes a main processor 110 and a plurality of wireless communication modules 120, 130, and 140 that share a frequency band. The present invention relates to a control process performed by the

wireless communication controllers

121, 131, 141 and the main processor 110 so that the plurality of wireless communication modules 120, 130, 140 can effectively achieve channel shifts. In this case, channel shift is used herein as a concept including channel hopping.

Here, the hybrid terminal 100 may be, for example, an IP set-top box in which various functional modules such as a plurality of wireless communication modules and an IoT gateway are mounted in combination. In FIG. 1, the first wireless communication module 120 is a wireless LAN (Wi-Fi) module, the second wireless communication module 130 is a Bluetooth module, and the third wireless communication module 140 is a Zigbee module. do.

That is, the frequency bands of the wireless LAN communication by the first wireless communication module 120 are 2.4 GHz band (13 channels) and 5 GHz band (14 channels), and the frequency of Bluetooth communication by the second wireless communication module 130. The band is 2.4 GHZ (79 channels) band, the ZigBee Tong frequency band by the third wireless communication module 140 is 2.4 GHz band (16 channels), 915 MHz band (10 channels, the United States) and 868 MHz band (1 Channel, Europe).

Here, the 2.4 GHz band is commonly used by the WLAN, Zigbee, and Bluetooth as the ISM band.

However, in IoT technology, since IoT sensors are built based on Bluetooth and Zigbee, it is expected that a large number of Bluetooth devices and Zigbee devices will be installed in a certain space when IoT technology is introduced in earnest. In addition, a number of WLAN APs are already installed in homes, offices, and public spaces, and their number is expected to increase. Accordingly, these wireless communication devices such as WLAN, Bluetooth, Zigbee, etc. should effectively use a common frequency band.

The present invention is to control a plurality of wireless communication modules (120, 130, 140) mounted on the hybrid terminal device 100 to smoothly perform a complex wireless communication such as WLAN, Bluetooth, Zigbee.

To this end, a control channel is formed between the plurality of wireless communication modules 120, 130, 140 and the main processor 110, and through this, a channel shift operation performed by the wireless communication modules 120, 130, 140 is performed by the main processor ( 110 is substantially controlled.

2 is a diagram illustrating a channel configuration of a wireless LAN in the 2.4 GHz band.

Referring to FIG. 2, the first wireless communication module 120 includes 13 nominal channels each having a 5 MHz bandwidth in a frequency band of the 2.4 GHz band. In this case, when one first wireless communication module 120 uses a specific WLAN channel (for example, CH05) as a center channel, a bandwidth of a predetermined width (for example, 20 MHz) including the center channel is used. Performs wireless LAN communication.

3 is a diagram illustrating a channel configuration of WLAN, Bluetooth, and Zigbee in the 2.4 GHz band.

First, FIG. 3 (a) shows that the first wireless communication module 120 selects and operates any one of 13 nominal channels having a 5 MHz bandwidth when performing wireless LAN communication.

3 (b) shows that the second wireless communication module 130 selects and operates any one of 79 nominal channels having a 1 MHz bandwidth when performing Bluetooth communication.

3 (c) shows that the third wireless communication module 140 selects and operates any one of 16 nominal channels having a 5 MHz bandwidth when performing Zigbee communication.

As a result, when the wireless communication modules 120, 130, and 140 mounted on the hybrid terminal 100 perform wireless LAN communication, Bluetooth communication, and Zigbee communication, channel interference due to frequency collision may occur. When channel interference occurs, the bit-error-rate or the signal-to-noise ratio (snr) decreases in wireless communication using the channel.

Therefore, when such a phenomenon occurs, the wireless communication module using the corresponding channel can recognize that channel interference has occurred to itself, and perform channel shift to solve this problem.

4 is a flowchart illustrating the overall process of the method for controlling a wireless channel shift in a hybrid terminal device according to the present invention.

Step S110: When the hybrid terminal 100 starts to operate normally, a control channel is established between the main processor 110 and the plurality of wireless communication modules 120, 130, and 140. In practice, a control channel is established between the main processor 110 and the plurality of wireless

communication module controllers

121, 131, and 141. The control channel is used by the main processor 110 to manage the wireless channel shift of the wireless communication module 120, 130, 140.

Step S120: In order for the hybrid terminal device 100 to operate normally, the wireless communication modules 120, 130, and 140 respectively set wireless communication channels such as WLAN, Bluetooth, and Zigbee to perform wireless communication.

Step S130: The main processor 110 collects the frequency local use status of the wireless communication module 120, 130, 140. In the present invention, the main processor 110 does not need to collect the overall frequency usage information of the external wireless communication environment, and the frequency use information of the wireless communication modules 120, 130, and 140 embedded in the hybrid terminal 100, that is, Collect 'frequency local usage'. Preferably, the main processor 110 collects frequency usage information in a common frequency band (eg, 2.4 GHz band) by the wireless communication module 120, 130, 140 as 'frequency local usage status'.

Step S140: Among a plurality of wireless communication modules 120, 130, and 140 embedded in the hybrid terminal device 100, a specific wireless communication module (hereinafter referred to as 'the x wireless communication module') generates a channel interference event. Detect.

For convenience of explanation, it is assumed that the x-th wireless communication module is the second wireless communication module 130 that performs Bluetooth communication.

At this time, the x-th wireless communication module 130 detects an error situation, for example, a phenomenon in which a bit error rate increases or a signal-to-noise ratio decreases in a wireless communication process, and thus detects a channel interference event.

Step S150: When the channel interference event is detected in the x-th wireless communication module 130, the x-th wireless communication controller 131 controlling the x-th wireless communication module 130 shifts the channel to solve the channel interference situation. Prepare.

Conceptually, the 'channel shift' is to move to a channel having a different frequency within the bandwidth of the corresponding wireless communication technology. In the present invention, the xth wireless communication controller 131 moves to the next channel (hereinafter, referred to as a 'next target channel'). ) Is determined by the main processor 110 instead of determining itself.

In this process, the main processor 110 and the x-th wireless communication controller 131 exchange data through the control channel set in step S110.

In addition, the main processor 110 utilizes the frequency local usage status collected in step S130 in determining whether to allow a specific channel frequency as a next target channel. By doing so, the main processor 110 adjusts such that internal frequency collision does not occur in the channel shift process.

A preferred embodiment in which the x-th wireless communication controller 131 determines the next target channel with the permission of the main processor 110 will be described in detail with reference to FIG. 5.

In operation S160, when the next target channel is set, the x-th wireless communication module 130 performs a shift to the next target target channel. Since a technology for processing channel shift in a specific wireless communication module is well known, a detailed description thereof is not presented herein.

Steps S170 and S180: The x-th wireless communication module 130 checks whether a frequency collision (channel interference) occurs in the next target channel after the channel shift. If other wireless communication devices, such as WLAN APs or IoT sensors, existing outside the hybrid terminal 100 are already actively using the next target channel, frequency collision occurs even if the channel shift is performed.

As such, if the frequency collision problem is still detected in the next target channel, the x-th wireless communication module 130 moves to step S150 to repeat the above operation in order to move to another frequency again.

On the contrary, if the frequency collision problem is not detected in the next target channel, the x-th wireless communication module 130 performs wireless communication in the next target channel. In the present specification, such a next target channel, in which the frequency collision problem is not detected in step S180, in which the x-th wireless communication module 130 normally performs wireless communication, is referred to as a 'next next channel'.

Step S180: Through the above process, the x-th wireless communication module 130 moves from a specific frequency channel where channel interference occurs to another frequency channel having a good wireless communication environment, that is, a final next channel.

The main processor 110 updates the frequency local use status of the x th wireless communication module 130 to reflect the final next channel. This is to be used when it is necessary to perform the channel shift again in the wireless communication module (120, 130, 140) mounted on the hybrid terminal 100 after that.

FIG. 5 is a flowchart illustrating a preferred example of a process in which an x th wireless communication controller 131 sets a next target channel for channel interference cancellation with the permission of the main processor 110.

Step S151: When a channel interference event is detected at the x-th wireless communication module 130 in step S140, the x-th wireless communication controller 131 of the x-th wireless communication module 130 resolves the channel interference situation. For this purpose, a channel capable of performing channel shift is selected as a channel having a different frequency (hereinafter, referred to as a 'next candidate channel') within the bandwidth of the corresponding wireless communication technology. In this case, the process of selecting the next candidate channel by the x-th wireless communication controller 131 may be variously implemented.

Step S152: The x-th wireless communication controller 131 provides the selected next candidate channel to the main processor 110 through the control channel established in step S110.

Steps S153 to S155: The main processor 110 compares the frequency local use status of itself managing the next candidate channel, which the x-th wireless communication controller 131 announces to perform a channel shift, with the next candidate. Check whether the channel causes an internal collision.

The main processor 110 manages what frequencies the plurality of wireless communication modules 120, 130, and 140 mounted on the hybrid terminal device 100 currently use as 'frequency local use status'.

If the next candidate channel for which the x th radio controller 131 is to perform a channel shift overlaps with a frequency already used by another wireless communication module (eg, 140), the x th radio controller 131 is the next candidate. Even if the channel is shifted, it is highly likely to repeat the channel shift to another channel again by the frequency collision in step S180.

Accordingly, the main processor 110 checks whether an internal collision of frequencies occurs by comparing the next candidate channel to which the x-th wireless communication controller 131 attempts to perform a channel shift with the frequency local use status, and the check result. To the x th wireless communication controller 131.

Step S156: When the frequency internal collision is notified that the current next candidate channel is not suitable for use, the x-th wireless communication controller 131 reselects the next candidate channel for channel interference cancellation, In step S152, the process of checking the frequency internal collision for the reselected next candidate channel is performed again.

Step S157: When notified that the frequency internal collision does not occur, the x-th wireless communication controller 131 sets the next candidate channel in which the frequency internal collision is avoided as the next target channel.

As above. By selecting the next candidate channel to be used in step S160 to avoid frequency internal collision through steps S151 to S157, the possibility of proceeding to step S150 due to the frequency collision in step S180 is reduced. The shift is achieved more efficiently than in the past.

As such, as the channel shift of the wireless communication is efficiently performed, the plurality of wireless communication modules 120, 130, and 140 mounted in the hybrid terminal 100 may perform the wireless communication much more smoothly than in the related art.

On the other hand, the present invention can be implemented in the form of computer-readable code on a computer-readable recording medium. These recording media include all kinds of devices that store computer readable data, such as ROM, RAM, CD-ROM, NAS, magnetic tape, hard disk, web disk, etc., and code is distributed over networked storage. It may be stored and executed.

Claims

In a hybrid terminal device having a main processor and a plurality of wireless communication modules, the control unit performs shifting of a wireless communication channel to avoid channel collision in a common frequency band commonly used by the plurality of wireless communication modules while avoiding internal collision. As a way to,

(a) establishing a control channel for managing channel shifts between the main processor and the plurality of wireless communication modules;

(b) the plurality of wireless communication modules setting wireless communication channels to perform wireless communication;

(c) collecting, by the main processor, frequency local usage by the plurality of wireless communication modules;

(d) detecting a channel interference event by a specific wireless communication module (hereinafter, referred to as an x-th wireless communication module) among the plurality of wireless communication modules;

(e) an x-th wireless communication controller controlling the x-th wireless communication module manages a next target channel to be applied to a channel shift for canceling the channel interference so that an internal collision does not occur in consideration of the frequency local usage. Setting with the permission of the main processor;

(f) the x-th wireless communication module performing a shift to the next target channel;

(g) the main processor updating the frequency local usage by reflecting the next target channel;

Internal collision avoidance wireless communication channel shift control method in a hybrid terminal device comprising a.
The method according to claim 1,

Carried out between steps (f) and (g),

(h) checking, by the xth wireless communication module, whether a frequency collision has occurred in the next target channel after the channel shift;

(i) if it is determined that a frequency collision has occurred in the next target channel as a result of the checking in step (h), proceeding to step (e) to reset the next target channel and retry channel shift;

(j) proceeding to step (g) if it is determined that no frequency collision occurs in the next target channel as a result of the check in step (h);

The internal collision avoidance wireless communication channel shift control method in a hybrid terminal device further comprises.
The method according to claim 2,

Step (e),

(e-1) selecting, by the x th wireless communication controller, a next candidate channel for channel interference cancellation as a channel having a different frequency within a bandwidth of a corresponding wireless communication technology;

(e-2) the x-th wireless communication controller providing the next candidate channel to the main processor;

(e-3) checking, by the main processor, whether there is an internal collision of the next candidate channel in comparison with the frequency local use status;

(e-4) the main processor providing an internal collision check result of the next candidate channel to the xth wireless communication controller;

(e-5) If it is determined that an internal collision has occurred in the next candidate channel as a result of checking in the step (e-3), the x-th wireless communication controller reselects a next candidate channel for channel interference cancellation and performs the step (e- Proceeding to 2);

(e-7) If it is determined that the internal collision does not occur in the next candidate channel as a result of checking in the step (e-3), the xth wireless communication controller determines the next candidate channel in which the internal frequency collision is avoided. Setting to a channel;

Internal collision avoidance wireless communication channel shift control method in a hybrid terminal device comprising a.
The method according to claim 3,

In the step (c), the main processor collects the frequency local use in the common frequency band by the plurality of wireless communication module, the internal collision avoidance wireless communication channel shift control method in a hybrid terminal device.
A computer-readable recording medium storing a program for executing an internal collision avoidance wireless communication channel shift control method in a hybrid terminal device according to any one of claims 1 to 4.