KR20190020503A - Wireless communication transmitter and receiver for information security - Google Patents

Abstract

According to the present invention, in transmitting and receiving a signal between a transmission apparatus and a reception apparatus in a wireless communication system, a signal is transmitted/received at a low power only when the channel condition is equal to or higher than a predetermined reference in consideration of information on the channel state between the transmission apparatus and the reception apparatus, thereby reducing the risk of eavesdropping even if a tethering apparatus exists around the transmission apparatus or the reception apparatus. In addition, the security can be further enhanced by transmitting and receiving signal with different data conversion codes for transmission and reception signals according to the channel state or lapse of time during transmission and reception of signals.

Description

TECHNICAL FIELD [0001] The present invention relates to a transmission apparatus, a receiving apparatus, and a receiving apparatus for information security in a wireless communication system,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wireless communication system, and more particularly, to a transmitting apparatus and a receiving apparatus and method for information security in a wireless communication system.

Generally, wireless communication utilizes a public medium called the air in such a manner that it transmits a signal to the air or receives a signal in the air to perform communication.

Therefore, if an unauthorized third party is located close to a transmitting apparatus such as a mobile communication terminal and knows a data conversion method of a signal transmitted and received between a receiving apparatus such as a base station and a transmitting apparatus, There is a risk of eavesdropping on the signal.

Further, when the power for transmitting a signal is increased in order to transmit and receive a stable signal between the transmitting apparatus and the receiving apparatus while the channel state between the transmitting apparatus and the receiving apparatus is poor, the risk of eavesdropping of the signal becomes higher.

(Patent Literature)

Korean Registered Patent No. 10-0808654 (Registered Date Feb. 22, 2008)

Therefore, in the present invention, in transmitting and receiving signals between a transmitting apparatus and a receiving apparatus in a wireless communication system, signals are transmitted / received at low power only when the channel condition is equal to or higher than a predetermined reference in consideration of channel state information between the transmitting apparatus and the receiving apparatus, It is possible to reduce the risk of eavesdropping even in the presence of a tethering device in the vicinity of the device or the receiving device and to transmit and receive signals by changing the data conversion code for the sending / And more particularly, to a transmitting apparatus and a receiving apparatus and method for information security in a wireless communication system capable of enhancing security.

According to the present invention, there is provided a data transmission apparatus for security in a wireless communication system, comprising: a channel gain acquiring unit for acquiring a channel gain of a wireless communication channel formed with a receiving apparatus; And a controller for controlling the transmitter to transmit the data to the receiver if the channel gain is equal to or greater than a preset reference value.

The data conversion unit may further include a data conversion unit, wherein the control unit selects one of the plurality of data conversion codes based on the channel gain, and the data conversion unit converts the data using the selected data conversion code And the transmitting unit transmits the converted data.

The data conversion unit may further include a data conversion unit, wherein the control unit selects one of the plurality of data conversion codes based on the time information, and the data conversion unit converts the data using the selected data conversion code, And the transmitting unit transmits the converted data.

The control unit may select one of the plurality of data conversion codes based on the channel gain and time information, and the data conversion unit may convert the data using the selected data conversion code, And transmits the converted data.

The channel gain obtaining unit may update the channel gain, and the controller may select the one data conversion code based on the updated channel gain.

The plurality of data conversion codes is a spreading code used in CDMA or a scrambling code used in a communication scheme for scrambling the data.

The channel gain acquiring unit may measure the channel gain using a signal for measuring the channel gain periodically transmitted from the receiver or may receive information on the channel gain from the receiver, Thereby obtaining a gain.

According to another aspect of the present invention, there is provided a data receiving apparatus for security in a wireless communication system, comprising: a receiving unit that receives data from the transmitting apparatus through a wireless communication channel formed with the transmitting apparatus; And a control unit for determining a data conversion code applied to the data by the transmitting apparatus on the basis of the restored data, wherein the control unit controls the data conversion code And acquires a channel gain of the wireless communication channel based on the received signal.

The plurality of data conversion codes each correspond to a predetermined channel gain range.

A transmission method for data security in a wireless communication system, the method comprising: acquiring a channel gain of a wireless communication channel formed with a receiving apparatus; checking whether the channel gain is equal to or greater than a preset reference value; And transmitting data to the receiver through the wireless communication channel when the reference value is equal to or greater than the reference value.

The transmitting step may include selecting one of the plurality of data conversion codes based on the channel gain, converting the data using the selected data conversion code, To the receiving apparatus.

The transmitting step may include selecting one of the plurality of data conversion codes based on the time information, converting the data using the selected data conversion code, and transmitting the data to the receiving device And a control unit.

According to the present invention, in transmitting and receiving signals between a transmitting apparatus and a receiving apparatus in a wireless communication system, a signal is transmitted / received at a low power only when the channel state is equal to or higher than a predetermined reference in consideration of channel state information between the transmitting apparatus and the receiving apparatus, There is an advantage that the risk of eavesdropping can be reduced even if the eavesdropping device exists around the device or the receiving device.

In addition, there is an advantage in that security can be further enhanced by performing transmission and reception of signals with different data conversion codes for the transmission and reception signals according to the channel state or the passage of time during signal transmission and reception.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a diagram illustrating an example of a wireless communication system in which a transmitting apparatus for transmitting and receiving signals in wireless communication and an apparatus for tapping in proximity to a receiving apparatus according to an embodiment of the present invention. FIG.
2 is a detailed block diagram of a transmitting apparatus for information security in a wireless communication system according to an embodiment of the present invention.
3 is a conceptual diagram illustrating data transmission according to a channel gain according to an embodiment of the present invention;
4 is an exemplary diagram of a data conversion code applied in accordance with a channel gain of a channel formed between a receiving apparatus and a transmitting apparatus according to an embodiment of the present invention;
5 is a detailed block diagram of a receiving apparatus for information security in a wireless communication system according to an embodiment of the present invention.

Hereinafter, the operation principle of the present invention will be described in detail with reference to the accompanying drawings. In the following description of the present invention, 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. The following terms are defined in consideration of the functions of the present invention, and these may be changed according to the intention of the user, the operator, or the like. Therefore, the definition should be based on the contents throughout this specification.

1 is a diagram illustrating an example of a wireless communication system according to an embodiment of the present invention.

Referring to FIG. 1, a wireless communication system includes a transmitting apparatus and a receiving apparatus for transmitting and receiving signals through wireless communication. In such a wireless communication system, there may be a tap apparatus for tapping data between a transmitting apparatus and a receiving apparatus.

 The eavesdropping apparatus 170 is located adjacent to the transmitting apparatus 100 or the receiving apparatus 150 and attempts to eavesdrop on signals transmitted to the atmosphere between the transmitting apparatus 100 and the receiving apparatus 150. [

At this time, when signals are transmitted / received at a relatively high power because the channel state between the transmitting apparatus 100 and the receiving apparatus 150 is poor, such a high-power signal can be received by the adjacent eavesdropping apparatus 170, There is a risk of.

Therefore, in the embodiment of the present invention, in order to improve the security of information in the wireless communication system, a signal is transmitted / received between the transmitting apparatus and the receiving apparatus with the lowest possible power. In addition, the data conversion method is changed in accordance with the change of the channel gain or the change of the time with respect to the data to be transmitted and received, so that the data transmission and reception can be securely performed from the tapping.

2 shows a detailed block configuration of a transmitting apparatus 100 for information security in a wireless communication system according to an embodiment of the present invention. The channel gain obtaining unit 202, the data converting unit 204, the transmitting unit 206 ), A control unit 208, and the like.

Hereinafter, operation of each component of the transmission apparatus 100 according to the embodiment of the present invention will be described in more detail with reference to FIG.

First, the channel gain acquiring unit 202 acquires a channel gain of a channel for wireless communication formed between a receiving apparatus and a transmitting apparatus on the receiving side. At this time, in obtaining the channel gain of the channel formed between the receiving apparatus and the transmitting apparatus 100 in the channel gain acquiring unit 202, various methods may exist.

That is, in acquiring the channel gain of the channel formed between the receiving apparatus and the transmitting apparatus in the channel gain acquiring unit 202, a signal transmitted periodically by the receiving apparatus for channel state measurement is received from the channel gain acquiring unit 202 So that the channel gain can be obtained by directly measuring the channel state. Particularly, in the TDD communication system, the transmitting apparatus 100 can grasp information on the channel state based on the signal transmitted from the receiving apparatus. In this case, the transmitting apparatus 100 can be a TDD mobile communication terminal And the receiving apparatus may be a base station or the like. At this time, the base station periodically transmits a pilot signal to the mobile communication terminal, which is the transmitting apparatus 100, as a signal for channel state measurement, and the transmitting apparatus 100 measures the channel state based on the pilot signal The channel gain between the receiving apparatus and the transmitting apparatus 100 can be obtained.

In addition, in acquiring the channel gain of the channel formed between the receiving apparatus and the transmitting apparatus in the channel gain acquiring unit 202, the receiving apparatus periodically transmits information on the channel state to the transmitting apparatus 100, The acquiring unit 202 may acquire a channel gain from the information on the channel state. In this case, the channel gain can be obtained without directly measuring the channel state in the channel gain acquiring unit 202.

The data conversion unit 204 receives a data conversion code for performing data conversion such as spreading or screaming data from the control unit 208 and performs data conversion on data to be transmitted to the receiving apparatus . The data conversion code may be, for example, a PN code, which is a spreading code used for spreading data in a CDMA wireless communication system. In a wireless communication system in which data is scrambled and transmitted, a scrambling code But is not limited thereto. Data transmitted from the transmitting apparatus 100 to the receiving apparatus is spread or scrambled through data conversion through the data converting unit 204 as described above, thereby enhancing security of information.

The transmitting unit 206 transmits the converted data through the data converting unit 204 to the receiving device.

The control unit 208 controls the operation of each component of the transmission apparatus 100 according to the embodiment of the present invention in accordance with a pre-stored operation program.

In addition, the control unit 208 may control the channel gain of the channel formed between the receiving apparatus and the transmitting apparatus provided from the channel gain obtaining unit 202 according to the embodiment of the present invention to be equal to or greater than a preset reference value It is possible to control the transmitting unit 206 to transmit data to the receiving apparatus.

That is, in the adaptive data transmission according to the channel state as described above, as shown in FIG. 3, when the channel gain is equal to or greater than the reference value g_th according to the channel state change due to short term fading in a mobile communication environment, It is possible to determine whether data is transmitted or not, and adaptive data transmission according to the channel state can be performed according to the channel state change according to the long term fading. In this case, in the case of long term fading, the channel state can be changed depending on whether there is an obstacle adjacent to the transmitting apparatus and the receiving apparatus. By transmitting data only when the long term fading is good, data can be transmitted with low power, The risk of data interception by a wiretapping device can be reduced.

In addition, the control unit 208 performs a data conversion for performing data conversion such as spreading or scrambling data to be transmitted from the transmitting apparatus 100 to the receiving apparatus through a channel formed for wireless communication between the receiving apparatus and the transmitting apparatus, And provides the generated code to the data conversion unit 204. Accordingly, the data conversion operation can be performed on the data transmitted from the data conversion unit 204 to the receiving apparatus. In this case, the data converter 204 may be implemented as a spreader in a CDMA wireless communication system, but is not limited thereto.

In addition, the control unit 208 may convert data such as spreading or scrambling data using different data conversion codes depending on the channel state where the channel gain is equal to or greater than the reference value, according to another embodiment of the present invention. In the case where the data conversion code is applied differently according to the channel state, it is more difficult for the eavesdropping device, which can be located in the vicinity of the transmitting device 100, to eavesdrop on the data transmitted / received between the receiving device and the transmitting device, You can increase your sex.

At this time, the control unit 208 continuously determines the information on the channel state after data transmission / reception with the receiving apparatus is started in a state of storing a plurality of different data conversion codes to be used according to the channel state, A data conversion code is selected and the selected data conversion code is provided to the data conversion unit 204 so that data to be transmitted to the receiving device is converted into different data conversion codes according to the channel state and is transmitted.

FIG. 4 illustrates a data conversion code applied according to a channel gain of a channel formed between a receiving apparatus and a transmitting apparatus according to an embodiment of the present invention.

Hereinafter, an embodiment in which the data conversion code is changed according to the channel state will be described in detail with reference to FIG.

4, when the channel gain of a channel formed between a receiving apparatus and a transmitting apparatus exceeds a reference value, the control unit 208 extracts a specific value interval from the reference value, for example, 10 dB (G1, g2, g3, g4), and correspond to different data conversion codes for each section.

Then, the control unit 208 checks whether the channel gain of the channel formed between the receiving apparatus and the transmitting apparatus changes based on the time when the channel gain exceeds the reference value and starts data transmission / reception. If the channel gain changes, Identifies the section including the channel gain, and applies the data conversion code corresponding to the identified section to the data conversion section 204. [ Accordingly, data transmitted to the receiving side is converted into different data conversion codes according to the channel status.

In addition, according to another embodiment of the present invention, the control unit 208 uses time information after the data transmission / reception between the receiving apparatus and the transmitting apparatus is started according to the channel state where the channel gain is equal to or greater than the reference value, Data may be transformed by spreading or scrambling data to be transmitted using a code. When the data conversion code is applied differently according to the passage of time, it is more difficult to eavesdrop on the data transmitted / received between the receiving device and the transmitting device in the eavesdropping device which can be located in the periphery of the transmitting device 100, The security can be enhanced.

That is, for example, the control unit 208 selects one data conversion code corresponding to the transmission time point of data among a plurality of different data conversion codes and applies the selected data conversion code to the data conversion unit 204, Each time a period of time elapses, another data conversion code corresponding to the elapsed time is selected and applied to the data conversion unit 204 so that data to be transmitted to the receiving device is converted into different data conversion codes .

Further, according to another embodiment of the present invention, the control unit 208 selects one data conversion code among a plurality of data conversion codes based on the channel gain and time information and applies the data conversion code to the data conversion unit 204 The transmitted data may be converted into different data conversion codes depending on the channel gain and the passage of time.

Meanwhile, information on a plurality of data conversion codes, which are changed or applied according to the channel state, may be shared between the transmitting apparatus 100 and the receiving apparatus and transmitted to the transmitting apparatus 100 ) And the receiving apparatus are applied with different data conversion codes so that data transmission and reception can be performed on the converted data. At this time, the receiving apparatus also confirms the data conversion code applied to the data transmitted from the transmitting apparatus 100 by sharing a plurality of data conversion codes with the transmitting apparatus 100, You can also easily check the information on.

5 illustrates a detailed block configuration of a receiving apparatus 150 for information security in a wireless communication system according to an embodiment of the present invention. The receiving apparatus 502 includes a receiving unit 502, a data restoring unit 504, a controlling unit 506, .

Hereinafter, operation of each component of the receiving apparatus 150 according to the embodiment of the present invention will be described in more detail with reference to FIG.

First, when the channel gain of the channel formed between the transmitting apparatus 100 and the receiving apparatus 150 is equal to or larger than a predetermined reference value g_th and the data is transmitted from the transmitting apparatus 100, ) Through the channel according to a predetermined data conversion method.

The data decompression unit 504 applies the data conversion code used for transmission to the converted data received from the transmission unit 502 to restore the original data.

The control unit 506 controls the operation of each component of the receiving apparatus 150 according to the embodiment of the present invention in accordance with a pre-stored operation program.

The control unit 506 stores the data conversion code shared with the transmission apparatus 100 and transmits the data conversion code shared with the transmission apparatus 100 to the data decompression unit 504 when the data is received from the reception unit 502. [ And controls the data restoring unit 504 to restore the data.

In addition, the control unit 506 may share a plurality of data conversion codes, which are changed according to a channel state change or a passage of time, together with the transmitting apparatus 100 according to another embodiment of the present invention, It selects one of a plurality of data conversion codes shared with the transmission apparatus 100 and restores the converted data.

At this time, the control unit 506 sequentially applies a plurality of data conversion codes shared by the transmitting apparatus 100 in order to restore the data received from the transmitting apparatus 100, thereby finding a data conversion code in which the data is properly restored And it is also possible to perform a channel gain change or a time lapse corresponding to a channel gain change or a time lapse among a plurality of data conversion codes in the same manner as in the data conversion code selecting process in the transmitting apparatus 100 based on channel gain information and time information synchronized with the transmitting apparatus 100 One data conversion code may be found, but is not limited thereto.

Accordingly, the receiving apparatus 150 can share information on a plurality of data conversion codes to be changed and applied to the transmitting apparatus 100 according to the channel state change or the passage of time, The data can be restored even if the data is received, and the security of the information can be enhanced.

As described above, according to the present invention, in transmitting and receiving signals between a transmitting apparatus and a receiving apparatus in a wireless communication system, considering a channel condition between a transmitting apparatus and a receiving apparatus, It is possible to reduce the risk of eavesdropping even in the presence of a tapping device in the vicinity of the transmitting device or the receiving device and also to transmit and receive signals by changing the data conversion code for the transmitting / The security can be further enhanced.

Combinations of the steps of each flowchart attached to the present invention may be performed by computer program instructions. These computer program instructions may be loaded into a processor of a general purpose computer, special purpose computer, or other programmable data processing apparatus so that the instructions, which are executed via a processor of a computer or other programmable data processing apparatus, Lt; / RTI > These computer program instructions may also be stored in a computer usable or computer readable memory capable of directing a computer or other programmable data processing apparatus to implement the functionality in a particular manner so that the computer usable or computer readable memory It is also possible to produce manufacturing items that contain instruction means for performing the functions described in each step of the flowchart. Computer program instructions may also be stored on a computer or other programmable data processing equipment so that a series of operating steps may be performed on a computer or other programmable data processing equipment to create a computer- It is also possible for the instructions to perform the processing equipment to provide steps for executing the functions described in each step of the flowchart.

In addition, each step may represent a module, segment, or portion of code that includes one or more executable instructions for executing the specified logical function (s). It should also be noted that in some alternative embodiments, the functions mentioned in the steps may occur out of order. For example, the two steps shown in succession may in fact be performed substantially concurrently, or the steps may sometimes be performed in reverse order according to the corresponding function.

While the invention has been shown and described with reference to certain preferred 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. Accordingly, the scope of the invention should not be limited by the described embodiments but should be defined by the appended claims.

100: transmitting apparatus 202: channel gain obtaining unit
204: data conversion unit 206:
208:

Claims (12)

A channel gain obtaining unit for obtaining a channel gain of a wireless communication channel formed between the receiving apparatus and the receiving apparatus,
A transmitter for transmitting data to the receiver through the wireless communication channel;
And controlling the transmitter to transmit the data to the receiver if the channel gain is equal to or greater than a preset reference value
.
The method according to claim 1,
Further comprising a data conversion unit,
Wherein the control unit selects one of the plurality of data conversion codes based on the channel gain,
Wherein the data conversion unit converts the data using the selected data conversion code,
And the transmitting unit transmits the converted data.
3. The method of claim 2,
Wherein,
Selecting one of the plurality of data conversion codes based on the channel gain and time information,
Wherein the data conversion unit converts the data using the selected data conversion code,
And the transmitting unit transmits the converted data.
3. The method of claim 2,
Wherein the channel gain obtaining unit updates the channel gain,
And the controller selects the one data conversion code based on the updated channel gain. The method according to claim 1,
Further comprising a data conversion unit,
Wherein the control unit selects one of the plurality of data conversion codes based on the time information,
Wherein the data conversion unit converts the data using the selected data conversion code,
And the transmitting unit transmits the converted data.
6. The method according to any one of claims 2 to 5,
Wherein the plurality of data conversion codes includes:
Which is a spreading code used in CDMA or a scrambling code used in a communication scheme for scrambling the data.
The method according to claim 1,
Wherein the channel gain acquiring unit comprises:
Wherein the channel gain measurement unit measures the channel gain using a signal for measuring the channel gain periodically transmitted from the reception apparatus or acquires the channel gain by receiving information on the channel gain from the reception apparatus.
A receiving unit for receiving data from the transmitting apparatus via a wireless communication channel formed between the transmitting apparatus and the transmitting apparatus;
A data restoring unit for restoring the data using a plurality of data conversion codes shared with the transmitting apparatus;
And a control unit for determining a data conversion code applied to the data by the transmitting apparatus based on the restored data,
And the controller acquires the channel gain of the wireless communication channel based on the determined data conversion code.
9. The method of claim 8,
Wherein the plurality of data conversion codes includes:
Each corresponding to a predetermined channel gain range.
Obtaining a channel gain of a wireless communication channel formed between the receiving apparatus and the receiving apparatus,
Checking whether the channel gain is equal to or greater than a preset reference value,
And transmitting data to the receiver through the wireless communication channel when the channel gain is equal to or greater than the reference value
And transmitting the data to the data transmitting apparatus.
11. The method of claim 10,
Wherein the transmitting comprises:
Selecting one of the plurality of data conversion codes based on the channel gain;
Converting the data using the selected data conversion code, and transmitting the converted data to the receiving apparatus.
11. The method of claim 10,
Wherein the transmitting comprises:
Selecting one of the plurality of data conversion codes based on the time information;
And converting the data using the selected data conversion code and transmitting the converted data to the receiving apparatus.

Images