WO2019006711A1 - Mobile device position control method and apparatus based on dynamic noise with signal to interference plus noise ratio - Google Patents

Abstract

The present invention provides a mobile device position control method and apparatus based on dynamic noise with a signal to interference plus noise ratio. The method comprises: determining a first change trend of a first secrecy capacity of a communication system on a (n+1)th timeslot relative to a second secrecy capacity of the communication system on a nth timeslot; determining a second change trend of a first eavesdropping capacity of a mobile device on the (n+1)th timeslot relative to a second eavesdropping capacity of the mobile device on the nth timeslot; determining the signal to interference plus noise ratio (SINR) of signals received by the mobile device in a same time; adjusting the transmit power for transmitting artificial noise signals by a target end device according to the first change trend, the second change trend and the SINR; and sending feedback information to the mobile device according to the first change trend. In embodiments of the present invention, the moving position of the mobile device can be controlled according to feedback information, and the secrecy capacity of the communication system is further optimized by adaptively adjusting the power of the artificial noise signals, so that secure communication is continuously performed.

Description

Mobile device position control method and device based on signal dry noise ratio dynamic noise Technical field

The present invention relates to the field of communications technologies, and in particular, to a mobile device location control method and apparatus based on dynamic noise of a signal to interference and noise ratio.

Background technique

With the convenience brought by wireless communication, people use a large number of wireless networks for sensitive and private information transmission in daily life. The traditional wireless network guarantees the security of information through high-level encryption technology, which assumes that the computing power of the eavesdropping end (ie, mobile device) is limited. However, with the rapid development of distributed computing, the computing power of the eavesdropping end has been increasing, and this assumption has become increasingly unreliable. The physical layer security technology has received more and more attention. It uses the legitimate target device to have better signal receiving quality (such as signal to noise ratio) than the eavesdropping end to ensure the security of communication and avoid relying on eavesdropping. The assumption that computing power is limited.

The existing cooperative communication methods in the physical layer security technology mainly include methods such as relay selection and cooperative artificial noise. The relay selection can increase the security capacity by selecting a relay to a "strong" transmission link to the intended destination and a "weak" transmission link to the eavesdropping end. However, existing cooperative communication methods also have significant drawbacks, such as the performance of the relay selection method is limited by the spatial location of the relay.

Summary of the invention

The embodiment of the invention discloses a mobile device position control method and device based on signal-to-noise ratio dynamic noise, which can control the moving position of the mobile device according to the feedback information, and further optimize the communication by adaptively adjusting the power of the artificial noise signal. The system's confidential capacity enables secure communications to continue.

The first aspect of the embodiments of the present invention discloses a mobile device location control method based on dynamic noise of a signal to interference and noise ratio, which is applied to a target device included in a communication system, where the communication system further includes the mobile device and the source device. The method includes:

Determining a first privacy capacity of the communication system at the (n+1)th time slot relative to the communication system a first change trend of the second security capacity in the nth time slot, wherein the second security capacity is an optimal security capacity of the communication system in the nth time slot, the (n+1)th The slot is a current time slot, the nth time slot is a previous time slot of the current time slot, and the n is a positive integer;

Determining a second change trend of the first eavesdropping capacity of the mobile device in the (n+1)th time slot relative to the second eavesdropping capacity of the mobile device in the nth time slot, wherein the second eavesdropping capacity is The best eavesdropping capacity of the mobile device in the nth time slot;

Determining a signal to interference and noise ratio SINR of a signal received by the mobile device at the same time, wherein the signal received by the mobile device at the same time includes an artificial noise signal from the target end device and from the source Useful signal for the end device;

Adjusting, according to the first change trend, the second change trend, and the SINR, a transmission power of the target end device to transmit the artificial noise signal;

And transmitting, according to the first change trend, feedback information to the mobile device to control a mobile location of the mobile device, where the feedback information is used to indicate that a security capacity of the communication system is increased or decreased.

As an optional implementation manner, in the first aspect of the embodiments of the present invention, the method further includes:

Comparing the size of the first security capacity and the second security capacity, determining a security capacity having a larger value of the first security capacity and the second security capacity as the communication system at (n+1) The best confidentiality capacity of the time slot;

Comparing the first eavesdropping capacity and the second eavesdropping capacity, determining an eavesdropping capacity of the first eavesdropping capacity and the second eavesdropping capacity as a value of the communication system at (n+1) The best eavesdropping capacity of the time slot;

The best security capacity of the communication system at the (n+1)th time slot and the best eavesdropping capacity of the communication system at the (n+1)th time slot are saved.

As an optional implementation manner, in the first aspect of the embodiment of the present invention, the adjusting, by the target end device, the manual, according to the first change trend, the second change trend, and the SINR The transmission power of the noise signal includes:

If the first change trend indicates that the security capacity of the communication system is increased, determining

If the first change trend indicates that the security capacity of the communication system is not increased, and the second change trend indicates that the eavesdropping capacity of the mobile device has not decreased, determining

If the first change trend indicates that the security capacity of the communication system is not increased, and the second change trend indicates that the eavesdropping capacity of the mobile device is decreased, determining

The P _D (n+1) is a transmission power of the target end device transmitting the artificial noise signal in the (n+1)th time slot, where the P _D (n) is the target end device Transmitting, by the nth time slot, transmission power of the artificial noise signal; the γ _R (n+1) being an SINR of a signal received by the mobile device in the (n+1)th time slot, the γ _R (n And being the SINR of the signal received by the mobile device in the nth time slot, the a being a correction factor and being a fixed value.

As an optional implementation manner, in the first aspect of the embodiments of the present invention, the determining that the first security capacity of the communication system in the (n+1)th time slot is relative to the communication system at the nth time Before the first change trend of the second security capacity of the gap, the method further includes:

Sending an artificial noise signal to the mobile device;

Receiving, by the mobile device, a processing signal forwarded by the mobile device, where the mobile device processes the artificial noise signal with a useful signal received from the source device at the same time;

The useful signal is obtained from the processed signal.

A second aspect of the embodiments of the present invention discloses a mobile device location control method based on dynamic noise of a signal to interference and noise ratio, which is applied to a mobile device included in a communication system, where the communication system further includes a source device and a target device, Methods include:

Receiving the useful signal sent by the source device and the artificial noise signal sent by the target device at the same time;

Processing the useful signal and the artificial noise signal to obtain a processed signal, and Transmitting the processing signal to the target device;

Receiving feedback information returned by the target end device for the processing signal, where the feedback information is used to indicate that the security capacity of the communication system is increased or decreased;

A mobile location is determined based on the feedback information and an eavesdropping capacity of the mobile device, and moves from a location where the mobile device is currently located to the mobile location.

As an optional implementation manner, in the second aspect of the embodiment of the present invention, determining the mobile location according to the feedback information and the eavesdropping capacity of the mobile device includes:

If the feedback information is used to indicate that the security capacity of the communication system is increased, and the eavesdropping capacity of the mobile device is not decreased, the current mobile step size is increased to a first mobile step; according to the current mobile device a position at the location and the first movement step to determine a movement position;

If the feedback information is used to indicate that the security capacity of the communication system is decreased, reducing the current moving step to a second moving step; according to the current location of the mobile device and the second moving step , determine the location of the move.

A third aspect of the embodiments of the present invention discloses a mobile device location control device, which is configured to be a target device included in a communication system, and includes:

a determining unit, configured to determine a first change trend of the first security capacity of the communication system in the (n+1)th time slot relative to the second security capacity of the communication system in the nth time slot, wherein the The second security capacity is an optimal security capacity of the communication system in the nth time slot, the (n+1)th time slot is a current time slot, and the nth time slot is a previous one of the current time slots. a time slot, the n being a positive integer;

The determining unit is further configured to determine a second change trend of the first eavesdropping capacity of the mobile device in the (n+1)th time slot relative to the second eavesdropping capacity of the mobile device in the nth time slot, where The second eavesdropping capacity is an optimal eavesdropping capacity of the mobile device in the nth time slot;

The determining unit is further configured to acquire a signal to interference and noise ratio SINR of the signal received by the mobile device at the same time, where the signal received by the mobile device at the same time includes an artificial from the target device a noise signal and a useful signal from the source device;

And an adjusting unit, configured to adjust, according to the first change trend, the second change trend, and the SINR, a transmission power of the target end device to transmit the artificial noise signal;

a first sending unit, configured to send feedback information to the mobile device according to the first change trend, to control a mobile location of the mobile device, where the feedback information is used to indicate that a security capacity of the communication system is increased or decline.

As an optional implementation manner, in the third aspect of the embodiment of the present invention, the mobile device location control apparatus further includes:

a comparison determining unit, configured to compare the size of the first security capacity and the second security capacity, and determine a security capacity having a larger value among the first security capacity and the second security capacity as the communication system Optimal security capacity in the (n+1)th time slot;

The comparison determining unit is further configured to compare the size of the first eavesdropping capacity and the second eavesdropping capacity, and determine the eavesdropping capacity of the first eavesdropping capacity and the second eavesdropping capacity as a value The best eavesdropping capacity of the communication system in the (n+1)th time slot;

And a saving unit, configured to save an optimal privacy capacity of the communication system in the (n+1)th time slot and an optimal eavesdropping capacity of the communication system in the (n+1)th time slot.

As an optional implementation manner, in a third aspect of the embodiments of the present invention, the adjusting unit adjusts, according to the first change trend, the second change trend, and the SINR, the target device transmission station The manner in which the transmission power of the artificial noise signal is described is specifically as follows:

If the first change trend indicates that the security capacity of the communication system is increased, determining

If the first change trend indicates that the security capacity of the communication system is not increased, and the second change trend indicates that the eavesdropping capacity of the mobile device has not decreased, determining

If the first change trend indicates that the security capacity of the communication system is not increased, and the second change trend indicates that the eavesdropping capacity of the mobile device is decreased, determining

The P _D (n+1) is a transmission power of the target end device transmitting the artificial noise signal in the (n+1)th time slot, where the P _D (n) is the target end device Transmitting, by the nth time slot, transmission power of the artificial noise signal; the γ _R (n+1) being an SINR of a signal received by the mobile device in the (n+1)th time slot, the γ _R (n And being the SINR of the signal received by the mobile device in the nth time slot, the a being a correction factor and being a fixed value.

As an optional implementation manner, in the third aspect of the embodiment of the present invention, the mobile device location control apparatus further includes:

a second sending unit, configured to determine, at the determining unit, a first security capacity of the communication system at the (n+1)th time slot with respect to a first security capacity of the communication system at a second security capacity of the nth time slot Sending the artificial noise signal to the mobile device before changing the trend;

a receiving unit, configured to receive a processing signal forwarded by the mobile device, where the processing signal is a signal that is processed by the mobile device by using the artificial noise signal and a useful signal received from the source device at the same time ;

And an obtaining unit, configured to obtain the useful signal from the processed signal.

A fourth embodiment of the present invention discloses a mobile device location control device, which is used in a mobile device included in a communication system, and includes:

a receiving unit, configured to receive the useful signal sent by the source device and the artificial noise signal sent by the target device at the same time;

Processing a sending unit, configured to process the useful signal and the artificial noise signal, obtain a processing signal, and forward the processed signal to the target end device;

The receiving unit is further configured to receive feedback information returned by the target end device for the processing signal, where the feedback information is used to indicate that the security capacity of the communication system is increased or decreased;

a determining unit, configured to determine a mobile location according to the feedback information and an eavesdropping capacity of the mobile device;

a mobile unit for moving from a location where the mobile device is currently located to the mobile location.

As an optional implementation manner, in a fourth aspect of the embodiments of the present invention, the determining, by the determining unit, the mobile location according to the feedback information and the eavesdropping capacity of the mobile device is specifically:

If the feedback information is used to indicate that the security capacity of the communication system is increased, and the eavesdropping capacity of the mobile device is not decreased, the current mobile step size is increased to a first mobile step; according to the current mobile device a position at the location and the first movement step to determine a movement position;

If the feedback information is used to indicate that the security capacity of the communication system is decreased, reducing the current moving step to a second moving step; according to the current location of the mobile device and the second moving step , determine the location of the move.

Compared with the prior art, the embodiment of the invention has the following beneficial effects:

In the embodiment of the present invention, the target end device may determine a first change trend of the first security capacity of the communication system in the (n+1)th time slot relative to the second security capacity of the communication system in the nth time slot. And determining a second change trend of the first eavesdropping capacity of the mobile device in the (n+1)th time slot relative to the second eavesdropping capacity of the mobile device in the nth time slot, and further, the target end device determines After the signal-to-interference ratio (SINR) of the signal received by the mobile device at the same time, the target device may adjust the target device transmission according to the first change trend, the second change trend, and the SINR. Transmitting power of the artificial noise signal, and transmitting feedback information to the mobile device according to the first change trend to control a mobile location of the mobile device. It can be seen that, in the embodiment of the present invention, the target end device may change according to the change trend (upgrade or decrease) of the security capacity of the communication system, the eavesdropping capacity of the mobile device (boost or descend), and the signal received by the mobile device at the same time. The SINR adaptively adjusts the power of the artificial noise signal, and controls the moving position of the mobile device according to the feedback information. At the same time, the power of the artificial noise signal is adaptively adjusted to further optimize the security capacity of the communication system, so that the secure communication continues.

DRAWINGS

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings to be used in the embodiments will be briefly described below. It is obvious that the drawings in the following description are only some embodiments of the present invention. Those skilled in the art can also obtain other drawings based on these drawings without paying any creative work.

1 is a schematic diagram of a model of a communication system according to an embodiment of the present invention;

2 is a schematic flow chart of a mobile device position control method based on dynamic noise ratio of a signal to interference and noise ratio according to an embodiment of the present invention;

3 is a schematic flow chart of another method for controlling a mobile device position based on dynamic noise of a signal to interference and noise ratio according to an embodiment of the present invention;

4 is a schematic flow chart of another method for controlling a mobile device position based on dynamic noise of a signal to interference and noise ratio according to an embodiment of the present invention;

FIG. 5 is a convergence diagram of communication capacity, security capacity, and eavesdropping capacity according to an embodiment of the present invention; FIG.

6 is a schematic structural diagram of a mobile device position control apparatus according to an embodiment of the present invention;

FIG. 7 is a schematic structural diagram of another mobile device position control apparatus according to an embodiment of the present invention; FIG.

FIG. 8 is a schematic structural diagram of another mobile device location control apparatus according to an embodiment of the present invention.

Detailed ways

The technical solutions in the embodiments of the present invention are clearly and completely described in the following with reference to the accompanying drawings in the embodiments of the present invention. It is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present invention without creative efforts are within the scope of the present invention.

It should be noted that the terms "first" and "second" and the like in the specification and claims of the present invention and the above drawings are used to distinguish different objects, and are not intended to describe a specific order. Furthermore, the terms "comprises" and "comprising" and "comprising" are intended to cover a non-exclusive inclusion. For example, a process, method, system, product, or device that comprises a series of steps or units is not limited to the listed steps or units, but optionally also includes steps or units not listed, or, optionally, Other steps or units inherent to these processes, methods, products or equipment.

The embodiment of the invention discloses a mobile device position control method and device based on signal-to-noise ratio dynamic noise, which can adaptively adjust the power of the artificial noise signal to more flexibly control the moving position of the mobile device, and further optimize the confidentiality of the communication system. Capacity to enable secure communication to continue. The details are described below in conjunction with the drawings.

Referring to FIG. 1, FIG. 1 is a schematic diagram of a model of a communication system according to an embodiment of the present invention. As shown in FIG. 1, the communication system includes a source device S, a mobile device R, and a target device D, optionally, It can also include eavesdropping device E.

The source device S is mainly used to send a useful signal, and the source device S may include but is not limited to a base station and a user equipment. A base station (e.g., an access point) can refer to a device in an access network that communicates with a wireless terminal over one or more sectors over an air interface. The base station can be used to convert the received air frame to the IP packet as a router between the wireless terminal and the rest of the access network, wherein the remainder of the access network can include an Internet Protocol (IP) network. The base station can also coordinate attribute management of the air interface. For example, the base station may be a base station (BTS, Base Transceiver Station) in GSM or CDMA, or may be a base station (NodeB) in WCDMA, or may be an evolved base station in LTE (NodeB or eNB or e-NodeB, evolutional Node B), the embodiment of the present invention is not limited. User equipment may include, but is not limited to, a smart phone, a notebook computer, a personal computer (PC), a personal digital assistant (PDA), a mobile internet device (MID), a wearable device (such as a smart watch). Various types of electronic devices, such as smart bracelets and smart glasses, wherein the operating system of the user device may include, but is not limited to, an Android operating system, an IOS operating system, a Symbian operating system, and a BlackBerry operating system. The Windows Phone 8 operating system and the like are not limited in the embodiment of the present invention.

The mobile device R is a device that has a signal forwarding function and can move at a certain height, and may include, but is not limited to, a drone, an airplane, a satellite, and the like.

The target device D is mainly used for transmitting and receiving signals, such as transmitting an artificial noise signal and receiving a useful signal. The target device D may include but is not limited to a base station and a user equipment.

The eavesdropping device E is mainly used to receive signals sent by the mobile device R. The eavesdropping device E may include but is not limited to a base station, a user equipment, a communication vehicle, and the like.

The communication system shown in Figure 1 is applicable to a two-hop wireless relay cooperative network. In Figure 1, a three-dimensional space coordinate system is established with O as the origin, including two ground units (one source device S and one target device). D) and a mobile device R. All devices are equipped with only a single antenna, and the source device S communicates with the target device D through the help of the mobile device R. Therefore, we call S→R the first hop communication and R→D the second hop communication. In the first hop communication, d ₁ is a corresponding direct path distance between the source device S and the mobile device R, and l ₁ and l ₂ are corresponding reflection path distances between the source device S and the mobile device R. In the second hop communication, d ₂ is the corresponding direct path distance between the mobile device R and the target end device D, and l ₃ and ₁₄ are the corresponding reflection path distances between the mobile device R and the target end device D. In FIG. 1, it is assumed that there is no direct path between the source device S and the target device D due to path loss or shadow effect, and the mobile device R can transmit the eavesdropped information to the eavesdropping device E without fail.

Among them, the mobile device R can belong to a heterogeneous network and has different security checks. Once the mobile device R is started, it may steal signals when it helps to forward signals. In this scenario, although the mobile device R is required to help forward the signal during signal transmission, for secure communication, it is desirable that the signal transmitted by the source device S is confidential to the mobile device R.

It should be noted that the model of the communication system shown in FIG. 1 is particularly applicable to a scenario in which the energy of the source device S is limited but still needs to be securely communicated through the mobile device R, for example, the transmission energy of the source device S in the disaster area. Relatively small (possibly damaged), but the target device D has sufficient energy feedback information.

In Figure 1, the mobile device R is usually at a relatively high altitude, and the transmission of the signal is mainly dependent on the reflection of the ground. While traditional cellular communication models focus only on ground level coverage without providing sufficiently accurate characterization for vertical channels with respect to height. Therefore, in the present invention, a height and distance-dependent mobile relay channel model is selected, which is a channel model of a mobile relay based on a two-path propagation model and considering antenna characteristics, and thus capable of Accurately describe the vertical channel characteristics with respect to height, rather than focusing only on ground coverage. This mobile relay channel model can be described as:

Where d is the distance between two communication devices, l ₁ and l ₂ are the distances of the reflection paths, respectively, and Δφ is the phase difference of the signals. From equation (1), it can be seen that the path loss L is defined based on the transmission signal wavelength λ, the highly correlated direct path antenna gain G _l (h), the highly correlated reflection path antenna gain G _r (h), highly correlated The propagation coefficient γ(h) and the ground reflection coefficient ε. The propagation coefficient γ(h) is defined as:

Where h _t is the height of the sender, h _r is the height of the receiver and γ ₀ is the maximum possible attenuation coefficient. The highly correlated direct path antenna gain G _l (h) can be expressed as:

The highly correlated reflection path antenna gain G _r (h) can be expressed as:

Where h _t,c is a height threshold and G ₀ is the channel gain of the different channel model.

In the communication system shown in FIG. 1, the source device S and the destination device D can simultaneously transmit signals to the mobile device R, wherein the source device S transmits a useful signal, and the target device D transmits an artificial noise signal. After receiving the useful signal and the artificial noise signal, the mobile device R amplifies the useful signal and the artificial noise signal, and forwards the processed signal to the target device D, and the target device D can receive the processed signal. A useful signal is obtained. Further, the target device D may receive a change trend (up or down) of the confidentiality capacity of the communication system, a trend of the eavesdropping capacity of the mobile device R (boost or descend), and the mobile device receives at the same time. The SINR of the signal is used to adaptively adjust the power of the artificial noise signal. At the same time, the target device D can also send feedback information to the mobile device R for indicating the increase or decrease of the security capacity of the communication system. After receiving the feedback information, the mobile device R receives the feedback information. , the mobile location can be determined based on the feedback information, and moved from the current location of the mobile device to the mobile The location enables more flexible control of the mobile location of the mobile device R, further optimizing the secure capacity of the communication system, and enabling secure communication to continue.

Please refer to FIG. 2. FIG. 2 is a schematic flowchart diagram of a mobile device location control method based on dynamic noise ratio of a signal to interference and noise ratio according to an embodiment of the present invention. The mobile device position control method based on the signal-to-noise ratio dynamic noise is applied to the target device. As shown in FIG. 2, the mobile device position control method based on the signal-to-noise ratio dynamic noise may include the following steps:

Step 201: The target end device sends the artificial noise signal to the mobile device.

In the embodiment of the present invention, it is assumed that the target end device sends the artificial noise signal x _D to the mobile device, and the transmission power of the target end device transmitting the artificial noise signal x _D is P _D , wherein the target end device and the device Path loss caused by transmitting the artificial noise signal x _D between mobile devices

The (n+1)th time slot is a current time slot, the nth time slot is a previous time slot of the current time slot, and the n is a positive integer.

Step 202: The target end device receives a processing signal forwarded by the mobile device.

The processing signal is a signal that the mobile device processes the artificial noise signal with a useful signal received from the source device at the same time.

It is assumed that the source device transmits a useful signal x _S to the mobile device. Transmitting, by the source device, the transmission power of the useful signal x _S is P _S , wherein the path loss generated by the source device and the mobile device transmitting the useful signal x _S

The signal received by the mobile device is

Where η ₁ (n+1) represents a complex Gaussian noise with a mean of zero variance of N ₀₁ .

Since the mobile device R adopts a mode of amplifying and forwarding, the mobile device multiplies the received signal y _R (n+1) by an amplification factor W(n+1) and then forwards it to the target device. D.

The processing signal received by the target device D is:

among them,

Representing the path loss generated by the processing signal y _D (n+1) between the mobile device R and the source device, and η ₂ (n+1) represents a complex Gauss with a mean value of zero variance of N ₀₂ noise.

Step 203: The target device obtains the useful signal from the processed signal.

In the embodiment of the present invention, since the target end device D knows the artificial noise signal x _D sent by itself, the target end device D can remove the interference x _D to itself, and obtain the useful signal as:

Step 204: The target end device determines a first change trend of the first security capacity of the communication system in the (n+1)th time slot relative to the second security capacity of the communication system in the nth time slot.

In the embodiment of the present invention, the target device can calculate a Signal to Interference plus Noise Ratio (SINR) between the received useful signal and the artificial noise signal.

The magnification factor W(n+1) can be defined as:

The target device can determine the communication capacity

The communication capacity may represent the amount of mutual information between the source device S and the target device D.

The SINR between the useful signal received by the mobile device and the artificial noise signal can be expressed as

Mobile devices can determine eavesdropping capacity

The eavesdropping capacity can be expressed as the amount of mutual information between the source device S and the mobile device R.

The target device determines the first security capacity C _s (n+1)=[C _D (n+1)-C _R (n+1)] ⁺ (15) of the communication system in the (n+1)th time slot. ), where [x] ⁺ □max{0, x}.

The second security capacity is an optimal privacy capacity of the communication system in the nth time slot. After the target device determines that the communication system is in the first security capacity of the (n+1)th time slot, the first security capacity may be compared with the second security capacity of the communication system in the nth time slot. A first change trend of the first security capacity of the communication system at the (n+1)th time slot relative to the second security capacity of the communication system at the nth time slot is determined. Wherein, the first change trend may include an increase in the secret capacity of the communication system or a change in the secret capacity of the communication system or a decrease in the secret capacity of the communication system.

Step 205: The target end device determines a second change trend of the first eavesdropping capacity of the mobile device in the (n+1)th time slot relative to the second eavesdropping capacity of the mobile device in the nth time slot.

The second eavesdropping capacity is an optimal eavesdropping capacity of the mobile device in the nth time slot. The target device may obtain the first eavesdropping capacity of the mobile device in the (n+1)th time slot from the mobile device, or the target end device may calculate the γ _D (n) and L _{R, D} (n) The first eavesdropping capacity of the mobile device at the (n+1)th time slot.

After the target device determines that the communication system is in the first eavesdropping capacity of the (n+1)th slot, the first eavesdropping capacity can be compared with the second eavesdropping capacity of the communication system in the nth slot. A second variation trend of the first eavesdropping capacity of the communication system at the (n+1)th time slot relative to the second eavesdropping capacity of the communication system at the nth time slot is determined. The second change trend may include an increase in the eavesdropping capacity of the communication system or an eavesdropping capacity of the communication system or a decrease in the eavesdropping capacity of the communication system.

Step 206: The target end device determines a signal to interference and noise ratio SINR of the signal received by the mobile device at the same time.

The signal received by the mobile device at the same time includes an artificial noise signal from the target end device and a useful signal from the source device. The signal to interference and noise ratio SINR of the signal received by the mobile device at the same time is the SINR between the useful signal and the artificial noise signal, as shown in equation (13).

Step 207: The target end device adjusts, according to the first change trend, the second change trend, and the SINR, a transmission power of the target end device to transmit the artificial noise signal.

Specifically, the target device according to the first change trend, the second change trend, and the SINR, adjusting transmission power of the target end device to transmit the artificial noise signal includes:

If the first change trend indicates that the security capacity of the communication system is increased, determining

If the first change trend indicates that the security capacity of the communication system is not increased, and the second change trend indicates that the eavesdropping capacity of the mobile device has not decreased, determining

If the first change trend indicates that the security capacity of the communication system is not increased, and the second change trend indicates that the eavesdropping capacity of the mobile device is decreased, determining

The P _D (n+1) is a transmission power of the target end device transmitting the artificial noise signal in the (n+1)th time slot, where the P _D (n) is the target end device Transmitting, by the nth time slot, transmission power of the artificial noise signal; the γ _R (n+1) being an SINR of a signal received by the mobile device in the (n+1)th time slot, the γ _R (n And being the SINR of the signal received by the mobile device in the nth time slot, the a being a correction factor and being a fixed value.

The specific algorithm is as follows:

If C _S (n+1)>C _S,best (n)

Else

If C _R (n+1) ≥ C _{R, best} (n)

Else

End

End

Step 208: The target device sends an inverse to the mobile device according to the first change trend. Information is fed to control the mobile location of the mobile device.

The feedback information is used to indicate that the security capacity of the communication system is increased or decreased. The feedback information includes positive feedback information or negative feedback information. If the security capacity of the communication system is increased, the target device may send 1 bit of positive feedback information to the mobile device. If the security capacity of the communication system decreases, the target device may The mobile device sends 1 bit of negative feedback information, wherein the target device only needs to feed back one bit of feedback information, which can save network resources.

Step 209: The target device compares the size of the first security capacity and the second security capacity, and determines a security capacity with a larger value among the first security capacity and the second security capacity as the communication system. The best security capacity in the (n+1)th time slot.

In the embodiment of the present invention, the security capacity and the eavesdropping capacity stored in the memory of the target device are optimal, that is, the second security capacity is the optimal security capacity of the communication system in the nth time slot; The second eavesdropping capacity is the best eavesdropping capacity of the mobile device in the nth time slot.

The target device needs to update the optimal security capacity and the best eavesdropping capacity in the real-time memory. The optimal security capacity update rule is:

C _S,best (n+1)=max(C _S,best (n),C _S (n+1))

The best rules for eavesdropping capacity updates are:

C _R,best (n+1)=max(C _R,best (n),C _R (n+1))

According to the foregoing update rule of the best security capacity, the target device needs to compare the size of the first security capacity with the second security capacity, and the value of the first security capacity and the second security capacity is larger. The security capacity is determined to be the best privacy capacity of the communication system at the (n+1)th time slot.

Step 210: The target device compares the first eavesdropping capacity and the second eavesdropping capacity, and determines an eavesdropping capacity with a larger value among the first eavesdropping capacity and the second eavesdropping capacity as the communication system. The best eavesdropping capacity in the (n+1)th time slot.

According to the update rule of the best eavesdropping capacity, the target device needs to compare the first eavesdropping capacity with the second eavesdropping capacity, and the value of the first eavesdropping capacity and the second eavesdropping capacity is larger. The eavesdropping capacity is determined to be the best eavesdropping capacity of the communication system at the (n+1)th time slot.

Step 211: The target device saves the best security capacity of the communication system in the (n+1)th slot and the best eavesdropping capacity of the communication system in the (n+1)th slot.

In the method depicted in FIG. 2, the target end device may determine the first privacy capacity of the communication system at the (n+1)th time slot relative to the second privacy capacity of the communication system at the nth time slot. a changing trend, and determining a second change trend of the first eavesdropping capacity of the mobile device in the (n+1)th time slot relative to the second eavesdropping capacity of the mobile device in the nth time slot, further, the target After determining, by the terminal device, the signal to interference and noise ratio (SINR) of the signal received by the mobile device at the same time, the target device may adjust the target according to the first change trend, the second change trend, and the SINR. The end device transmits the transmission power of the artificial noise signal, and sends feedback information to the mobile device according to the first change trend to control a mobile location of the mobile device. It can be seen that, in the embodiment of the present invention, the target end device may change according to the change trend (upgrade or decrease) of the security capacity of the communication system, the eavesdropping capacity of the mobile device (boost or descend), and the signal received by the mobile device at the same time. The SINR adaptively adjusts the power of the artificial noise signal, and controls the moving position of the mobile device according to the feedback information. At the same time, the power of the artificial noise signal is adaptively adjusted to further optimize the security capacity of the communication system, so that the secure communication continues.

Please refer to FIG. 3. FIG. 3 is a schematic flowchart diagram of another mobile device location control method based on dynamic noise ratio of the signal to interference and noise ratio disclosed in the embodiment of the present invention. The mobile device position control method based on the signal-to-noise ratio dynamic noise is applied to the mobile device. As shown in FIG. 3, the mobile device position control method based on the signal-to-noise ratio dynamic noise may include the following steps:

Step 301: The mobile device receives the useful signal sent by the source device and the artificial noise signal sent by the target device at the same time.

It is assumed that at the same time, the source device transmits a useful signal x _S to the mobile device and the target device transmits an artificial noise signal x _D to the mobile device. The signal received by the mobile device is as described in equation (7).

Step 302: The mobile device processes the useful signal and the artificial noise signal to obtain a processing signal, and forwards the processed signal to the target device.

The mobile device processes the useful signal and the artificial noise signal to obtain a processed signal as described in the formula (8).

Step 303: The mobile device receives feedback information returned by the target end device for the processing signal.

After receiving the processing signal, the target end device may determine that the first security capacity of the communication system in the (n+1)th time slot is relative to the second security of the communication system in the nth time slot. And a first change trend of the capacity, and sending feedback information to the mobile device according to the first change trend, wherein the feedback information is used to indicate that the security capacity of the communication system is increased or decreased. The feedback information includes positive feedback information or negative feedback information. If the security capacity of the communication system is increased, the target device may send 1 bit of positive feedback information to the mobile device. If the security capacity of the communication system decreases, the target device may The mobile device sends 1 bit of negative feedback information.

Step 304: The mobile device determines a mobile location according to the feedback information and an eavesdropping capacity of the mobile device, and moves from a location where the mobile device is currently located to the mobile location.

Specifically, determining, by the mobile device, the mobile location according to the feedback information and the eavesdropping capacity of the mobile device includes:

If the feedback information is used to indicate that the security capacity of the communication system is increased, and the eavesdropping capacity of the mobile device is not decreased, the current mobile step size is increased to a first mobile step; according to the current mobile device a position at the location and the first movement step to determine a movement position;

If the feedback information is used to indicate that the security capacity of the communication system is decreased, reducing the current moving step to a second moving step; according to the current location of the mobile device and the second moving step , determine the location of the move.

Wherein, in the case that the feedback information is used to indicate that the security capacity of the communication system is increased, It is further required to determine whether the cumulative positive feedback counter exceeds the cumulative positive feedback counter threshold, and if so, to perform increasing the current moving step size to the first moving step size; likewise, the feedback information is used to indicate the communication In the case where the security capacity of the system is degraded, it is necessary to further determine whether the accumulated negative feedback counter exceeds the cumulative negative feedback counter threshold, and if so, the current moving step size is reduced to the second moving step size. In order to avoid the moving step size being too fast, a positive feedback counter threshold adjustment factor is needed to adjust the cumulative positive feedback counter threshold.

An example is as follows:

First, the initialization of the relevant parameters can be performed. Suppose R(x(0), y(0)) is the initial position of the mobile device R, and the adjustment factor ξ(0)=0 is set. Initially, the optimal security capacity C _{S, Best} (0) = 0 and the best eavesdropping capacity C _{R, best} (0) = 0.

Specifically, the corresponding algorithm is as follows:

If one-bit of positive information

R _best (x(n+1), y(n+1))=R(x(n+1), y(n+1));

ξ(n+1)=0; C _N =0;

C _P =C _P +1;

If C _P ≥C _T1

C _P =0;

δ ₀ (n+1)=δ ₀ (n)·R _I ;

C _T1 = C _T1 + Δ _T ;

End

Elseif one-bit of negative information

R _best (x(n+1), y(n+1))=R _best (x(n), y(n));

ξ(n+1)=-δ(n);

C _N =C _N +1;

If C _N ≥C _T2

δ ₀ (n+1)=δ ₀ (n)·R _D ;

C _N =0;

C _P =0;

End

End

Where C _N is the continuous negative feedback counter, C _P is the cumulative positive feedback counter, C _T1 is the feedback counter threshold, C _T2 is the negative feedback counter threshold, Δ _T is the positive feedback counter threshold adjustment factor, δ ₀ (n+1) For the moving step size, R _I is the step size increase factor and R _D is the step size reduction factor.

The mobile device determines, according to the feedback information, that the next moving position of the mobile device is R(x(n+2), y(n+2))=R _best (x(n+1), y(n+1) ) ξ(n+1)+δ(n+1), further, the mobile device can move to the position where R(x(n+2), y(n+2)) is located.

The method described in FIG. 3 is implemented, and the mobile device can receive the useful signal sent by the source device and the artificial noise signal sent by the target device at the same time, and further process the useful signal and the artificial noise signal to obtain the processed signal. And sending the processing signal to the target device, and receiving the feedback information returned by the target device for the processing signal, determining the moving position according to the feedback information, and moving from the current location of the mobile device to the moving position, thereby Flexibly control the location of the mobile device to optimize the confidentiality of the communication system.

Please refer to FIG. 4. FIG. 4 is a schematic flowchart diagram of another mobile device location control method based on dynamic noise ratio of the signal to interference and noise ratio disclosed in the embodiment of the present invention. The mobile device position control method based on the signal-to-noise ratio dynamic noise is described from three sides of the source device, the mobile device, and the target device. Some or all of the steps in FIG. 4 may refer to FIG. 2 or FIG. 3. The description in the description will not be repeated here. As shown in FIG. 4, the mobile device position control method based on the signal to interference and noise ratio dynamic noise may include the following steps:

Step 401: The source device sends a useful signal to the mobile device.

Step 402: The target device sends an artificial noise signal to the mobile device.

Wherein, step 401 and step 402 occur simultaneously.

Step 403: The mobile device processes the useful signal and the artificial noise signal to obtain a processing signal.

Step 404: The mobile device forwards the processing signal to the target end device.

Step 405: The target device obtains the useful signal from the processed signal.

Step 406: The target end device determines a first change trend of the first security capacity of the communication system in the (n+1)th time slot relative to the second security capacity of the communication system in the nth time slot.

Step 407: The target end device determines a second change trend of the first eavesdropping capacity of the mobile device in the (n+1)th time slot relative to the second eavesdropping capacity of the mobile device in the nth time slot.

Step 408: The target device acquires a signal to interference and noise ratio SINR of the signal received by the mobile device at the same time.

Step 409: The target end device adjusts, according to the first change trend, the second change trend, and the SINR, a transmission power of the target end device to transmit the artificial noise signal.

Step 410: The target device compares the size of the first security capacity and the second security capacity, and determines a security capacity with a larger value among the first security capacity and the second security capacity as the communication system. The best security capacity in the (n+1)th time slot.

Step 411: The target device compares the first eavesdropping capacity and the second eavesdropping capacity, and determines the eavesdropping capacity of the first eavesdropping capacity and the second eavesdropping capacity as the communication system. The best eavesdropping capacity in the (n+1)th time slot.

Step 412: The target device saves the best security capacity of the communication system in the (n+1)th time slot and the best eavesdropping capacity of the communication system in the (n+1)th time slot.

Step 413: The target device sends feedback information to the mobile device according to the first change trend.

Step 414: The mobile device determines a mobile location according to the feedback information and the eavesdropping capacity of the mobile device, and moves from the location where the mobile device is currently located to the mobile location.

Referring to FIG. 5 together, FIG. 5 is a convergence diagram of communication capacity, security capacity, and eavesdropping capacity disclosed in an embodiment of the present invention. Wherein, the position coordinates of the source device S are set at (-1000m, 1000m, 10m), the position coordinates of the target device D are set at (1000m, -1000m, 10m), the carrier frequency f is set to 2020MHz, and the height of the mobile device R is set. It is h=100m. The initial value of the transmission power of the artificial noise signal is set to 0.5W, N ₀₁ =N ₀₂ =-80dBm, the ground reflection coefficient ε=0.5 and the fading factor γ ₀ =3.5, the step size increase factor R _I =1.2, the step size is reduced. Small factor R _D = 0.7, positive feedback counter threshold C _T1 = 2, negative feedback counter threshold C _T2 = 5, positive feedback counter threshold adjustment factor Δ _T =1, α = 0.829, R starting position is (-1500m, - 1000m, 100m), initial step size δ ₀ (0) = 80m. C _D represents the communication capacity, C _S represents the secret capacity, and C _R represents the eavesdropping capacity. As shown in FIG. 5, the artificial noise signal is introduced, and the size of the P _D is adaptively adjusted to confuse the mobile device R. The communication system improves the security capacity C _S without sacrificing the eavesdropping capacity C _R , thereby making the mobile device R sufficiently Trust the communication system so that secure communication continues.

Wherein, implementing the method described in FIG. 4, the target device may receive a change trend (up or down) of the confidentiality capacity of the communication system, a trend of the eavesdropping capacity of the mobile device (boost or descend), and the mobile device receives at the same time. The SINR of the signal adaptively adjusts the power of the artificial noise signal, and controls the moving position of the mobile device according to the feedback information. At the same time, the power of the artificial noise signal is adaptively adjusted to further optimize the security capacity of the communication system, so that the secure communication continues. get on.

Please refer to FIG. 6. FIG. 6 is a schematic structural diagram of a mobile device position control apparatus according to an embodiment of the present invention. The mobile device location control apparatus described in FIG. 6 may be used to perform some or all of the steps of the mobile device position control method based on the signal to interference and noise ratio dynamic noise described in FIG. 2 or FIG. 4, which is specifically shown in FIG. 2 . Or the related description in FIG. 4, and details are not described herein again. The mobile device location control device operates on a target device included in the communication system. As shown in FIG. 6, the mobile device location control apparatus may include:

a determining unit 601, configured to determine a first change trend of the first security capacity of the communication system in the (n+1)th time slot relative to the second security capacity of the communication system in the nth time slot, where The second security capacity is an optimal security capacity of the communication system in the nth time slot, the (n+1)th time slot is a current time slot, and the nth time slot is an upper time slot. a time slot, the n being a positive integer;

The determining unit 601 is further configured to determine a second change trend of the first eavesdropping capacity of the mobile device in the (n+1)th time slot relative to the second eavesdropping capacity of the mobile device in the nth time slot, The second eavesdropping capacity is an optimal eavesdropping capacity of the mobile device in the nth time slot;

The determining unit 601 is further configured to determine a signal to interference and noise ratio (SINR) of the signal received by the mobile device at the same time, where the signal received by the mobile device at the same time includes the signal from the target end device. An artificial noise signal and a useful signal from the source device;

The adjusting unit 602 is configured to adjust, according to the first change trend, the second change trend, and the SINR, a transmission power of the target end device to transmit the artificial noise signal;

The first sending unit 603 is configured to send, according to the first change trend, feedback information to the mobile device to control a mobile location of the mobile device, where the feedback information is used to indicate the The confidentiality capacity of the letter system is increased or decreased.

Specifically, the adjusting unit 602 adjusts, according to the first change trend, the second change trend, and the SINR, a manner in which the target end device transmits the transmission power of the artificial noise signal, specifically:

If the first change trend indicates that the security capacity of the communication system is increased, determining

If the first change trend indicates that the security capacity of the communication system is not increased, and the second change trend indicates that the eavesdropping capacity of the mobile device has not decreased, determining

If the first change trend indicates that the security capacity of the communication system is not increased, and the second change trend indicates that the eavesdropping capacity of the mobile device is decreased, determining

The P _D (n+1) is a transmission power of the target end device transmitting the artificial noise signal in the (n+1)th time slot, where the P _D (n) is the target end device Transmitting, by the nth time slot, transmission power of the artificial noise signal; the γ _R (n+1) being an SINR of a signal received by the mobile device in the (n+1)th time slot, the γ _R (n And being the SINR of the signal received by the mobile device in the nth time slot, the a being a correction factor and being a fixed value.

Wherein, the mobile device location control device described in FIG. 6 can be implemented according to a change trend (up or down) of the security capacity of the communication system, a change trend (lifting or decreasing) of the eavesdropping capacity of the mobile device, and the mobile device at the same time. The SINR of the received signal adaptively adjusts the power of the artificial noise signal, and controls the moving position of the mobile device according to the feedback information. At the same time, the power of the artificial noise signal is adaptively adjusted to further optimize the security capacity of the communication system, so that the secure communication continues. Conducted.

Please refer to FIG. 7. FIG. 7 is another mobile device position control device according to an embodiment of the present invention. Schematic diagram of the structure. The mobile device location control apparatus described in FIG. 7 may be used to perform some or all of the steps of the mobile device position control method based on the signal to interference and noise ratio dynamic noise described in FIG. 2 or FIG. 4, which is specifically shown in FIG. 2 . Or the related description in FIG. 4, and details are not described herein again. The mobile device location control device operates on a target device included in the communication system. The mobile device position control device shown in FIG. 7 is optimized by the mobile device position control device shown in FIG. 6. The mobile device location control device shown in FIG. 7 may further include:

The comparison determining unit 604 is configured to compare the size of the first security capacity and the second security capacity, and determine a security capacity with a larger value of the first security capacity and the second security capacity as the communication The optimal security capacity of the system in the (n+1)th time slot;

The comparison determining unit 604 is further configured to compare the size of the first eavesdropping capacity and the second eavesdropping capacity, and determine an eavesdropping capacity that is a larger value of the first eavesdropping capacity and the second eavesdropping capacity as The best eavesdropping capacity of the communication system at the (n+1)th time slot;

The saving unit 605 is configured to save the best security capacity of the communication system in the (n+1)th time slot and the best eavesdropping capacity of the communication system in the (n+1)th time slot.

Optionally, the mobile device location control apparatus shown in FIG. 7 may further include:

a second sending unit 606, configured to determine, in the determining unit, that the first security capacity of the communication system in the (n+1)th time slot is relative to the second security capacity of the communication system in the nth time slot Sending the artificial noise signal to the mobile device before a change trend;

The receiving unit 607 is configured to receive a processing signal forwarded by the mobile device, where the processing signal is processed by the mobile device to process the artificial noise signal and the useful signal received from the source device at the same time. signal;

The obtaining unit 608 is configured to obtain the useful signal from the processed signal.

Wherein, the mobile device position control device described in FIG. 7 is implemented, capable of adaptively adjusting the power of the artificial noise signal to more flexibly control the moving position of the mobile device, receiving the processing signal from the mobile device, and obtaining a useful signal from the processed signal, Achieve secure communication. In addition, the security capacity of the communication system and the eavesdropping capacity of the mobile device can be updated and saved in real time.

Please refer to FIG. 8. FIG. 8 is a schematic structural diagram of another mobile device location control apparatus according to an embodiment of the present invention. The mobile device location control apparatus described in FIG. 8 may be used to perform some or all of the steps of the mobile device location control method based on the signal to interference and noise ratio dynamic noise described in FIG. 3 or FIG. 4, which is specifically shown in FIG. 3. Or the related description in FIG. 4, and details are not described herein again. Wherein, the mobile device location control device operates on a mobile device included in the communication system. As shown in FIG. 8, the mobile device location control apparatus may include:

The receiving unit 801 is configured to receive the useful signal sent by the source device and the artificial noise signal sent by the target device at the same time;

The processing sending unit 802 is configured to process the useful signal and the artificial noise signal, obtain a processing signal, and forward the processing signal to the target end device;

The receiving unit 801 is further configured to receive feedback information returned by the target end device for the processing signal, where the feedback information is used to indicate that the security capacity of the communication system is increased or decreased;

a determining unit 803, configured to determine a mobile location according to the feedback information and an eavesdropping capacity of the mobile device;

Specifically, the manner in which the determining unit 803 determines the mobile location according to the feedback information and the eavesdropping capacity of the mobile device is specifically:

If the feedback information is used to indicate that the security capacity of the communication system is increased, and the eavesdropping capacity of the mobile device is not decreased, the current mobile step size is increased to a first mobile step; according to the current mobile device a position at the location and the first movement step to determine a movement position;

If the feedback information is used to indicate that the security capacity of the communication system is decreased, reducing the current moving step to a second moving step; according to the current location of the mobile device and the second moving step , determine the location of the move.

The mobile unit 804 is configured to move from a location where the mobile device is currently located to the mobile location.

The mobile device position control device shown in FIG. 8 can receive the useful signal sent by the source device and the artificial noise signal sent by the target device at the same time, and further process the useful signal and the artificial noise signal to obtain the processed signal. And sending the processing signal to the target device, and then receiving the feedback information returned by the target device for the processing signal, according to the feedback information The mobile location is determined and moved from the current location of the mobile device to the mobile location so that the privacy capacity of the communication system can be optimized by flexibly controlling the location of the mobile device.

In the above embodiments, the descriptions of the various embodiments are different, and the details that are not detailed in a certain embodiment can be referred to the related descriptions of other embodiments.

In the several embodiments provided herein, it should be understood that the disclosed apparatus may be implemented in other ways. For example, the device embodiments described above are merely illustrative. For example, the division of the unit is only a logical function division. In actual implementation, there may be another division manner, for example, multiple units or components may be combined or may be Integrate into another system, or some features can be ignored or not executed. In addition, the mutual coupling or direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection through some interface, device or unit, and may be electrical or otherwise.

The units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, may be located in one place, or may be distributed to multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of the embodiment.

In addition, each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above integrated unit can be implemented in the form of hardware or in the form of a software functional unit.

The integrated unit, if implemented in the form of a software functional unit and sold or used as a standalone product, may be stored in a computer readable memory. Based on such understanding, the technical solution of the present invention may contribute to the prior art or all or part of the technical solution may be embodied in the form of a software product stored in a memory. A number of instructions are included to cause a computer device (which may be a personal computer, server or network device, etc.) to perform all or part of the steps of the methods described in various embodiments of the present invention. The foregoing memory includes: a U disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a removable hard disk, a magnetic disk, or an optical disk, and the like, which can store program codes.

A person skilled in the art can understand that all or part of the steps of the foregoing embodiments can be completed by a program to instruct related hardware, and the program can be stored in a computer readable memory, and the memory can include: a flash drive , read-only memory (English: Read-Only Memory, referred to as: ROM), random accessor (English: Random Access Memory, referred to as: RAM), disk or CD.

The mobile device position control method and device based on the signal-to-noise ratio dynamic noise disclosed in the embodiment of the present invention are described in detail. The principle and implementation manner of the present invention are described in the following examples. The description is only for helping to understand the method of the present invention and its core idea; at the same time, for those skilled in the art, according to the idea of the present invention, there will be changes in specific embodiments and application scopes. The contents of this specification are not to be construed as limiting the invention.

Claims (10)

1. A mobile device position control method based on dynamic noise of a signal to interference and noise ratio is applied to a target device included in a communication system, the communication system further comprising the mobile device and a source device, wherein the method comprises :

   Determining a first change trend of the first security capacity of the communication system in the (n+1)th time slot relative to the second security capacity of the communication system in the nth time slot, wherein the second security capacity is The communication system has an optimal security capacity in the nth time slot, the (n+1)th time slot is a current time slot, and the nth time slot is a previous time slot of the current time slot, n is a positive integer;

   Determining a second change trend of the first eavesdropping capacity of the mobile device in the (n+1)th time slot relative to the second eavesdropping capacity of the mobile device in the nth time slot, wherein the second eavesdropping capacity is The best eavesdropping capacity of the mobile device in the nth time slot;

   Determining a signal to interference and noise ratio SINR of a signal received by the mobile device at the same time, wherein the signal received by the mobile device at the same time includes an artificial noise signal from the target end device and from the source Useful signal for the end device;

   Adjusting, according to the first change trend, the second change trend, and the SINR, a transmission power of the target end device to transmit the artificial noise signal;

   And transmitting, according to the first change trend, feedback information to the mobile device to control a mobile location of the mobile device, where the feedback information is used to indicate that a security capacity of the communication system is increased or decreased.
2. The method of claim 1, wherein the method further comprises:

   Comparing the size of the first security capacity and the second security capacity, determining a security capacity having a larger value of the first security capacity and the second security capacity as the communication system at (n+1) The best confidentiality capacity of the time slot;

   Comparing the first eavesdropping capacity and the second eavesdropping capacity, determining an eavesdropping capacity of the first eavesdropping capacity and the second eavesdropping capacity as a value of the communication system at (n+1) The best eavesdropping capacity of the time slot;

   The best security capacity of the communication system at the (n+1)th time slot and the best eavesdropping capacity of the communication system at the (n+1)th time slot are saved.
3. The mobile device position control method based on signal to interference and noise ratio dynamic noise according to claim 2, wherein said adjusting said said according to said first change trend, said second change trend, and said SINR The transmission power of the target device to transmit the artificial noise signal includes:

   If the first change trend indicates that the security capacity of the communication system is increased, determining

   

   If the first change trend indicates that the security capacity of the communication system is not increased, and the second change trend indicates that the eavesdropping capacity of the mobile device has not decreased, determining

   

   If the first change trend indicates that the security capacity of the communication system is not increased, and the second change trend indicates that the eavesdropping capacity of the mobile device is decreased, determining

   

   The P _D (n+1) is a transmission power of the target end device transmitting the artificial noise signal in the (n+1)th time slot, where the P _D (n) is the target end device Transmitting, by the nth time slot, transmission power of the artificial noise signal; the γ _R (n+1) being an SINR of a signal received by the mobile device in the (n+1)th time slot, the γ _R (n And being the SINR of the signal received by the mobile device in the nth time slot, the a being a correction factor and being a fixed value.
4. The mobile device position control method based on signal to interference and noise ratio dynamic noise according to any one of claims 1 to 3, wherein said determining said communication system is first in said (n+1)th time slot The method further includes: prior to the first change trend of the security capacity of the communication system in the second security capacity of the nth time slot, the method further comprising:

   Sending an artificial noise signal to the mobile device;

   Receiving, by the mobile device, a processing signal forwarded by the mobile device, where the mobile device processes the artificial noise signal with a useful signal received from the source device at the same time;

   The useful signal is obtained from the processed signal.
5. Mobile device position control method based on dynamic noise of signal to noise ratio, applied to communication The system includes a mobile device, the communication system further includes a source device and a target device, wherein the method includes:

   Receiving the useful signal sent by the source device and the artificial noise signal sent by the target device at the same time;

   Processing the useful signal and the artificial noise signal to obtain a processing signal, and forwarding the processed signal to the target device;

   Receiving feedback information returned by the target end device for the processing signal, where the feedback information is used to indicate that the security capacity of the communication system is increased or decreased;

   A mobile location is determined based on the feedback information and an eavesdropping capacity of the mobile device, and moves from a location where the mobile device is currently located to the mobile location.
6. The mobile device position control method based on the signal to interference and noise ratio dynamic noise according to claim 5, wherein the determining the mobile location according to the feedback information and the eavesdropping capacity of the mobile device comprises:

   If the feedback information is used to indicate that the security capacity of the communication system is increased, and the eavesdropping capacity of the mobile device is not decreased, the current mobile step size is increased to a first mobile step; according to the current mobile device a position at the location and the first movement step to determine a movement position;

   If the feedback information is used to indicate that the security capacity of the communication system is decreased, reducing the current moving step to a second moving step; according to the current location of the mobile device and the second moving step , determine the location of the move.
7. A mobile device location control device, which is implemented in a target device included in a communication system, and includes:

   a determining unit, configured to determine a first change trend of the first security capacity of the communication system in the (n+1)th time slot relative to the second security capacity of the communication system in the nth time slot, wherein the The second security capacity is an optimal security capacity of the communication system in the nth time slot, the (n+1)th time slot is a current time slot, and the nth time slot is a previous one of the current time slots. a time slot, the n being a positive integer;

   The determining unit is further configured to determine a second change trend of the first eavesdropping capacity of the mobile device in the (n+1)th time slot relative to the second eavesdropping capacity of the mobile device in the nth time slot, where , The second eavesdropping capacity is an optimal eavesdropping capacity of the mobile device in the nth time slot;

   The determining unit is further configured to acquire a signal to interference and noise ratio SINR of the signal received by the mobile device at the same time, where the signal received by the mobile device at the same time includes an artificial from the target device a noise signal and a useful signal from the source device;

   And an adjusting unit, configured to adjust, according to the first change trend, the second change trend, and the SINR, a transmission power of the target end device to transmit the artificial noise signal;

   a first sending unit, configured to send feedback information to the mobile device according to the first change trend, to control a mobile location of the mobile device, where the feedback information is used to indicate that a security capacity of the communication system is increased or decline.
8. The mobile device position control device according to claim 7, wherein the mobile device position control device further comprises:

   a comparison determining unit, configured to compare the size of the first security capacity and the second security capacity, and determine a security capacity having a larger value among the first security capacity and the second security capacity as the communication system Optimal security capacity in the (n+1)th time slot;

   The comparison determining unit is further configured to compare the size of the first eavesdropping capacity and the second eavesdropping capacity, and determine the eavesdropping capacity of the first eavesdropping capacity and the second eavesdropping capacity as a value The best eavesdropping capacity of the communication system in the (n+1)th time slot;

   And a saving unit, configured to save an optimal privacy capacity of the communication system in the (n+1)th time slot and an optimal eavesdropping capacity of the communication system in the (n+1)th time slot.
9. The mobile device location control apparatus according to claim 8, wherein the adjusting unit adjusts the target end device to transmit the manual according to the first change trend, the second change trend, and the SINR The way to transmit power of a noise signal is as follows:

   If the first change trend indicates that the security capacity of the communication system is increased, determining

   

   If the first change trend indicates that the security capacity of the communication system is not increased, and the second change trend indicates that the eavesdropping capacity of the mobile device has not decreased, determining

   

   If the first change trend indicates that the security capacity of the communication system is not increased, and the second change trend indicates that the eavesdropping capacity of the mobile device is decreased, determining

   

   The P _D (n+1) is a transmission power of the target end device transmitting the artificial noise signal in the (n+1)th time slot, where the P _D (n) is the target end device Transmitting, by the nth time slot, transmission power of the artificial noise signal; the γ _R (n+1) being an SINR of a signal received by the mobile device in the (n+1)th time slot, the γ _R (n And being the SINR of the signal received by the mobile device in the nth time slot, the a being a correction factor and being a fixed value.
10. The mobile device position control device according to any one of claims 7 to 9, wherein the mobile device position control device further comprises:

    a second sending unit, configured to determine, at the determining unit, a first security capacity of the communication system at the (n+1)th time slot with respect to a first security capacity of the communication system at a second security capacity of the nth time slot Sending the artificial noise signal to the mobile device before changing the trend;

    a receiving unit, configured to receive a processing signal forwarded by the mobile device, where the processing signal is a signal that is processed by the mobile device by using the artificial noise signal and a useful signal received from the source device at the same time ;

    And an obtaining unit, configured to obtain the useful signal from the processed signal.

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