KR20190093441A - Communication node for personal area communication in wireless communication network and operation method therefor - Google Patents

Abstract

Disclosed in the present invention is an operation method of a terminal in a communication network. The operation method of the terminal comprises the steps of: receiving a wireless signal from an access point; determining a first interference predictive value based on the wireless signal and wireless measurement information; determining an interference interval based on the first interference predictive value or a second interference predictive value; transmitting a data frame to the access point in a non-interference interval except for the interference interval; and transmitting a data frame to the access point according to a back off procedure in the interference interval. Accordingly, the present invention may effectively use a frequency band by reducing a collision probability due to interference signals through the operation method of the terminal, thereby increasing communication performance.

Description

COMMUNICATION NODE FOR PERSONAL AREA COMMUNICATION IN WIRELESS COMMUNICATION NETWORK AND OPERATION METHOD THEREFOR}

The present invention relates to a wireless communication network, and more particularly to a communication node and a method of operation thereof for personal area communication in a wireless communication network.

The Industrial Scientific Medical (ISM) band is intended for use in the industrial, scientific and medical fields. The ISM band is a frequency band open to the public for use without permission. Wireless fidelity (Wi-Fi), Bluetooth, ZigBee and the like are representative communication protocols using the ISM band.

In particular, Wi-Fi is a representative wireless communication service using the ISM band, and can establish an access point (AP) facility through an internet router. In addition to laptops and smartphones, general household appliances such as printers, televisions, speakers, and the like can perform wireless communication via Wi-Fi.

As Wi-Fi increases in coverage, it frequently occupies radio resources in the ISM band. Accordingly, a communication node using a wireless personal area network (WPAN) such as Bluetooth, Zigbee, etc. in the ISM band may have a problem of frequently being interfered with by a Wi-Fi signal.

SUMMARY OF THE INVENTION An object of the present invention is to provide an access point for controlling connection control and data transmission and reception of a communication node using a second communication protocol based on an interference signal generation pattern by a communication node using a first communication protocol in a wireless communication network. To provide.

Another object of the present invention is to collect the interference signal generation and related data based on the radio resource occupancy characteristics of the near field communication signal in the wireless communication network, calculate the interference pattern generation pattern based on the collected data, and generate the interference signal It is to provide a communication node for controlling the network connection time point based on the pattern calculation result.

In order to achieve the above object, the present invention discloses a method of operating a terminal in a communication network. The operating method of the terminal, the step of receiving a radio signal from an access point (access point); Determining a first interference prediction value based on the radio signal and radio measurement information; Determining an interference interval based on the first interference prediction value or the second interference prediction value; Transmitting a data frame to the access point in a non-interference interval except for the interference interval; And transmitting a data frame to a terminal according to a back off procedure in the interference period. The radio signal includes time information, channel assignment information, and synchronization information for access control. The radio measurement information is first radio measurement information determined by the terminal or second radio measurement information determined by the access point. The wireless signal includes the second interference prediction value determined by the access point.

The wireless signal may include the second wireless measurement information. The second radio measurement information may include second energy detection information, second link quality indicator information, second clear channel assessment information, and a second received signal strength indicator. received signal strength indication) information.

The determining of the first interference prediction value may include determining the first radio measurement information. The first radio measurement information may include at least one of first energy sensing information, first link quality indicator information, first clear channel evaluation information, and first received signal strength indicator information.

The determining of the first interference prediction value may include: determining a first operation value obtained by calculating the radio measurement information, the time information, the channel allocation information, and the synchronization information and a predefined first weight matrix; And determining the first operation value as the first interference prediction value.

Determining the first interference prediction value comprises: determining an actual interference value; Determining a cross entropy value between the first interference prediction value and the actual interference value; Determining a derivative value for the cross entropy value; Determining a learning value for calculating the differential value and a predefined learning rate; Determining the difference value as a second weighting matrix when a difference value between the first interference prediction value and the learning value exceeds a predetermined threshold value; Determining a second operation value obtained by calculating the radio measurement information, the time information, the channel assignment information, and the synchronization information and the second weight matrix; And determining the second operation value as the first interference prediction value.

The determining of the first interference prediction value may include: determining the first operation value as the first interference prediction value when a difference value between the first interference prediction value and the learning value is equal to or less than a predetermined threshold value; It may include.

Receiving the wireless signal comprises: receiving a beacon from the access point; And updating the access information of the terminal based on the beacon, wherein the beacon may include the first radio measurement information, access information about the access point, and allocation time information.

The transmitting of the data frame in the non-interfering period may include transmitting the data signal at an allocated time according to the allocation time information. The data frame may include at least one of the second radio measurement information and the second interference prediction value.

Receiving the radio signal may include transmitting an association request message to the access point; And receiving a connection response message for the connection request message from the access point.

The transmitting of the data frame in the non-interfering period may include detecting received energy; And determining whether to use a wireless channel based on the detection result. The data frame may include at least one of the second radio measurement information and the first interference prediction value.

In order to achieve the above object, the present invention discloses a method of operating an access point in a communication network. The operation method of the access point, the step of transmitting a radio signal to the terminal in the non-interference interval except the interference interval; Receiving a data frame from the terminal in the non-interference period; Determining a first interference prediction value based on the data signal and radio measurement information; Determining the interference interval based on the first interference prediction value or the second interference prediction value; And performing a back off function in the interference section. The radio measurement information is first radio measurement information determined by the access point or second radio measurement information determined by the terminal. The radio signal includes the second interference prediction value determined by the terminal.

The wireless signal may include the second wireless measurement information. The second radio measurement information may include second energy detection information, second link quality indicator information, second clear channel assessment information, and a second received signal strength indicator. received signal strength indication) information.

Determining the interference prediction value comprises: determining the first radio measurement information; And determining the interference prediction value based on the first radio measurement information and time information for access control, channel allocation information, and synchronization information. The first radio measurement information may include at least one of first energy sensing information, first link quality indicator information, first clear channel evaluation information, and first received signal strength indicator information.

The determining of the interference prediction value may include: determining a first operation value obtained by calculating the radio measurement information, the time information, the channel allocation information, and the synchronization information and a predefined first weight matrix; And determining the first operation value as the interference prediction value.

Determining the interference prediction value comprises: determining an actual interference value; Determining a cross entropy value between the interference prediction value and the actual interference value; Determining a derivative value for the cross entropy value; Determining a learning value for calculating the differential value and a predefined learning rate; Determining the difference value as a second weight matrix when the difference value between the interference prediction value and the learning value exceeds a predetermined threshold value; Determining a second operation value obtained by calculating the radio measurement information, the time information, the channel assignment information, and the synchronization information and the second weight matrix; And determining the second operation value as the interference prediction value.

The determining of the interference prediction value may include determining the first operation value as the interference prediction value when a difference value between the interference prediction value and the learning value is equal to or less than a predetermined threshold value.

The step of transmitting the wireless signal includes: determining whether to use a beacon; And when using the beacon, transmitting the wireless signal including the beacon to the terminal. The beacon may include the second radio measurement information, access information about the access point, and allocation time information. The wireless signal may include the first interference prediction value.

Receiving a data frame in the non-interference period, the step of activating a random access function in a predetermined random access interval; Activating a time division access function when the random access interval ends; And receiving the data frame at the time allocated according to the allocation time information from the terminal through the random access function or the time division access function. The data frame may include the first radio measurement information.

The transmitting of the wireless signal may include: activating a random access function when the beacon is not used; Receiving a connection request message from the terminal; Transmitting a connection response message for the connection request message to the terminal; And receiving the wireless signal.

In order to achieve the above object, the present invention discloses a terminal in a communication network. The terminal includes a processor; And a memory in which at least one instruction executed by the processor is stored, the at least one instruction receiving a radio signal from an access point and based on the radio signal and radio measurement information. Determine a first interference prediction value, determine an interference interval based on the first interference prediction value or the second interference prediction value, and transmit a data frame to the access point in a non-interference interval except for the interference interval, In the interference period, a data frame is transmitted to the access point according to a back off procedure. The radio signal includes time information, channel assignment information, and synchronization information for access control. The radio measurement information is first radio measurement information determined by the terminal or second radio measurement information determined by the access point. The wireless signal includes the second interference prediction value determined by the access point.

The first communication node according to the embodiment determines the interval for transmitting and receiving a radio signal with the second communication node based on the generation pattern of the interference signal, thereby avoiding interference to control the network connection of the second communication node There is.

The first communication node according to the embodiment controls the communication function of the second communication node by predicting the generation time of the interference signal, thereby effectively transmitting and receiving data by autonomously avoiding the timing of the interference traffic.

The first communication node according to the embodiment obtains an interference signal generation pattern through a machine learning method, so that even if a change occurs in the interference signal generation pattern, it is possible to adaptively respond to a change in the communication environment through learning. .

The first communication node according to the embodiment can effectively use the frequency band by reducing the collision probability due to the interference signal, thereby improving the communication performance.

1 is a conceptual diagram illustrating a communication system according to a first embodiment.
2 is a block diagram showing a communication node in the communication system according to the first embodiment.
3 is a conceptual diagram illustrating a short-range communication network according to a second embodiment.
4A and 4B are conceptual diagrams illustrating a communication node according to the second embodiment.
5A and 5B are flowcharts showing the operation sequence of the first communication node according to the second embodiment.
6 is a flowchart showing an operation sequence of a second communication node according to the second embodiment.
7 is a flowchart showing an operation sequence of a second communication node according to the second embodiment.
8 is a flowchart illustrating an operation sequence of a terminal according to the third embodiment.
9 is a flowchart showing an operation procedure of an access point according to the fourth embodiment.

As the present invention allows for various changes and numerous embodiments, particular embodiments will be illustrated in the drawings and described in detail in the written description. However, this is not intended to limit the present invention to specific embodiments, it should be understood to include all modifications, equivalents, and substitutes included in the spirit and scope of the present invention.

Terms such as first and second may be used to describe various components, but the components should not be limited by the terms. The terms are only used to distinguish one component from another. For example, without departing from the scope of the present invention, the first component may be referred to as the second component, and similarly, the second component may also be referred to as the first component. The term and / or includes a combination of a plurality of related items or any item of a plurality of related items.

When a component is referred to as being "connected" or "connected" to another component, it may be directly connected to or connected to that other component, but it may be understood that other components may be present in between. Should be. On the other hand, when a component is said to be "directly connected" or "directly connected" to another component, it should be understood that there is no other component in between.

The terminology used herein is for the purpose of describing particular example embodiments only and is not intended to be limiting of the present invention. Singular expressions include plural expressions unless the context clearly indicates otherwise. In this application, the terms "comprise" or "have" are intended to indicate that there is a feature, number, step, operation, component, part, or combination thereof described in the specification, and one or more other features. It is to be understood that the present invention does not exclude the possibility of the presence or the addition of numbers, steps, operations, components, components, or a combination thereof.

Unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art. Terms such as those defined in the commonly used dictionaries should be construed as having meanings consistent with the meanings in the context of the related art and shall not be construed in ideal or excessively formal meanings unless expressly defined in this application. Do not.

Hereinafter, with reference to the accompanying drawings, it will be described in detail a preferred embodiment of the present invention. In the following description of the present invention, the same reference numerals are used for the same elements in the drawings and redundant descriptions of the same elements will be omitted.

1 is a conceptual diagram illustrating a communication system according to a first embodiment.

Referring to FIG. 1, the communication network 100 may include a first node 111, a second node 121, a first gateway 112, a second gateway 122, and a communication server 130. .

The first node 111 is a terminal that is connected to and communicates with a first wireless personal area network (WPAN) 110, and may be connected to an internet network through a first gateway 112. Here, the first WPAN 110 may communicate in at least one of Bluetooth, Ultra Wide-Band (UWB), ZigBee, and Chirp-Spread-Spectrum (CSS).

The second node 121 is a terminal connected to and communicates with the second WPAN 120 and is connected to the Internet through the second gateway 122. Here, the second WPAN 120 may communicate in at least one of Bluetooth, UWB, Zigbee, CSS.

The first gateway 112 manages communication for all nodes in the first WPAN 110, and may connect all nodes including the first node 111 in the first WPAN 110 to the Internet network. The second gateway 122 manages communication for all nodes in the second WPAN 120, and may connect all nodes including the second node 121 in the second WPAN 120 to the Internet network. The communication server 300 may be connected to communication nodes of the first WPAN 110 and the second WPAN 120 through the Internet.

2 is a block diagram showing a communication node in the communication system according to the first embodiment.

Referring to FIG. 2, the communication node 200 may include at least one processor 210, a memory 220, and a transceiver 230 that communicates with a network. In addition, the communication node 200 may further include an input interface device 240, an output interface device 250, a storage device 260, and the like. Each component included in the communication node 200 may be connected by a bus 270 to communicate with each other.

However, each component included in the communication node 200 may be connected through a separate interface or a separate bus around the processor 210, instead of the common bus 270. For example, the processor 210 may be connected to at least one of the memory 220, the transceiver 230, the input interface device 240, the output interface device 250, and the storage device 260 through a dedicated interface. .

The processor 210 may execute a program command stored in at least one of the memory 220 and the storage device 260. The processor 210 may refer to a central processing unit (CPU), a graphics processing unit (GPU), or a dedicated processor on which methods according to embodiments of the present invention are performed. Each of the memory 220 and the storage device 260 may be configured as at least one of a volatile storage medium and a nonvolatile storage medium. For example, the memory 220 may be configured as at least one of a read only memory (ROM) and a random access memory (RAM).

3 is a conceptual diagram illustrating a short-range communication network according to a second embodiment.

Referring to FIG. 3, the short range communication network 300 may include first communication protocol devices 301 to 306 and second communication protocol devices 307. For example, first communication protocol equipment may include an access point (AP) 301, a user equipment 302, a monitor 303, a computer 304, a television 305, and a camera 306. Can be.

The first communication protocol equipments 301 to 306 and the second communication protocol equipments 307 may use the same frequency band, for example, the first communication protocol equipments 301 to 306 and the second communication protocol equipment. The fields 307 may use the ISM frequency band.

The first communication protocol may be a communication protocol for a wireless local area network (WLAN). For example, the first communication protocol may be a communication protocol for Wi-Fi.

The second communication protocol equipments 307 can use the second communication protocol. The second communication protocol may be a communication protocol different from the first communication protocol. The second communication protocol may be a communication protocol for a wireless personal area network (WPAN). For example, the second communication protocol may be a communication protocol for Bluetooth or Zigbee. The second communication protocol devices 307 may include a Bluetooth device and a Zigbee device.

The access point 301 may be a wifi router. The access point 301 may be associated with various electronic devices such as the user equipment 302, the monitor 303, the computer 304, the television 305, the camera 306, and the like. The access point 301 may provide a service to a user to remotely use various electronic devices through the Internet or an application.

FIG. 3 illustrates five electronic devices 302 to 306 linked with the access point 301 for convenience of description. However, the number of electronic devices linked with the access point 301 may be less than five or more than five.

When the number of electronic devices linked with the access point 301 increases, the resource utilization rate of the first frequency band used by the access point 301 may increase. That is, the time during which resources of the first frequency band used by the access point 301 are idle may be reduced. When the time when the resource of the first frequency band is idle decreases, the possibility of collision between radio signals transmitted and received by communication nodes using the resource of the first frequency band may increase.

For example, since the first communication protocol equipments 301 to 306 use the first communication protocol, each of the first communication protocol equipments 301 to 306 transmits and receives a radio signal transmitted and received within the first frequency band. Workarounds can be applied.

However, the second communication protocol equipment 307 may be impossible to interpret for the first communication protocol. Therefore, a signal transmitted and received by the second communication protocol devices 307 may collide with a signal transmitted and received by the first communication protocol devices 301 to 306.

In addition, when the first communication protocol is a Wi-Fi communication protocol and the second communication protocol is Bluetooth or Zigbee, the first communication protocol devices 301 to 306 wirelessly perform higher power than the second communication protocol devices 307. You can send a signal. Therefore, the radio signal transmitted and received by the first communication protocol equipments 301 to 306 may generate very strong interference with the radio signal transmitted and received by the second communication protocol equipment 307.

Accordingly, the second communication protocol devices 307 may attempt communication after determining whether the resource of the first frequency band is idle. However, the second communication protocol devices 307 operate independently of the first communication protocol devices 301-306. Therefore, signals transmitted and received by the second communication protocol devices 307 may collide with signals transmitted and received by the first communication protocol devices 301 to 306.

That is, the communication performance of the second communication protocol devices 307 may be degraded due to the interference by the radio signal transmitted and received by the first communication protocol devices 301 to 306.

The first communication protocol equipments 301 to 306 may be applied to a solution for error occurrence. In contrast, the second communication protocol equipments 307 may be limitedly applied to a solution for error occurrence due to the low price pursuit.

Accordingly, the second communication protocol devices 307 communicate in a communication environment in which interference with a radio signal transmitted and received by the first communication protocol devices 301 to 306 does not occur in order to minimize a disadvantage in terms of performance. It needs to be done.

The second communication protocol equipment 307 may have the aforementioned disadvantages. However, the second communication protocol devices 307 may be utilized as communication equipment for providing a smart service due to the advantage of automatically collecting data. The second communication protocol equipments 307 may have a low data rate of tens to hundreds of kbps. Accordingly, the second communication protocol equipments 307 may be used for sensor data transmission.

For example, the second communication protocol equipment 307 may be utilized as communication equipment for charging according to a remote meter reading such as gas or electricity. In this case, the second communication protocol devices 307 may sufficiently transmit and receive necessary data by using the corresponding communication network only a few times a month. Therefore, when the signal is lost due to communication performance deterioration, the second communication protocol equipments 307 may attempt to retransmit and receive necessary data with sufficient time margin. That is, the second communication protocol devices 307 may maintain a certain level of service quality even if communication performance is degraded.

However, when the second communication protocol equipments 307 need to transmit and receive data at high speed or when the amount of data to be transmitted and received is large, the second communication protocol equipment 307 may lack time margin for data retransmission and reception. In this case, the second communication protocol devices 307 may lose data.

Recently, there has been an increasing number of Internet of things (IOT) communication equipments (not shown) providing services using data sampled at high speed such as temperature or vibration. Therefore, communication performance of IoT communication equipments may affect the quality of service.

The access point 301 may start a communication service at the request of a user. For example, the access point 301 can start a Wi-Fi service at the request of the first communication protocol equipments 302-306. For example, the user equipment 302 or laptop 304 may be provided with an internet search, multimedia streaming service via the access point 301.

That is, the ISM band usage by the transmission / reception signal of the access point 301 in the first communication protocol region may be affected by the presence of the user. For example, when the access point 301 is installed in an office (not shown), the amount of transmission and reception of the first communication protocol signal through the access point 301 may increase in the office worker's rush hour. In addition, the amount of transmission and reception of the first communication protocol signal through the access point 301 may be reduced during the office worker's leaving time.

That is, the frequency of transmission and reception of the first communication protocol signal may be expressed as a function of time. Therefore, when activating the second communication protocol devices 307 during the time when the ISM band usage by the first communication protocol signal is low, the impulse probability between the first communication protocol signal and the second communication protocol signal may be reduced. Therefore, the communication performance of the second communication protocol equipment 307 can be improved. In addition, the number of signal retransmission attempts of the second communication protocol equipment 307 may be reduced. Accordingly, the efficiency of use for the ISM band can also be increased.

The above description suggests the expected effect of improving the communication performance of the second communication protocol equipment 307 through the case of the user's commute and leave time. However, the time at which the first communication protocol signal is transmitted and received may vary depending on the use example of the access point 301. Accordingly, the second communication protocol equipments 307 need to autonomously determine the time when the interference signal is less generated. In this way, the second communication protocol equipments 307 may avoid the interference in a manner of maximizing the amount of data transmission / reception signals at a time when the interference signal is low. That is, the second communication protocol equipments 307 can attempt to communicate to avoid interference to improve the performance of the communication network.

4A and 4B are conceptual diagrams illustrating a communication node according to the second embodiment.

4A is a conceptual diagram illustrating the configuration and operation of a communication node according to an embodiment. The communication node 400 may use the frequency of the ISM band. In this case, the communication node 400 may use the frequency of the ISM band together with the first communication nodes (not shown) using the first communication protocol. The communication node 400 may use a second communication protocol that is different from the first communication protocol.

The frequency occupancy of the ISM band may increase as more users use the first communication protocol. That is, the frequency occupancy of the ISM band may be proportional to the number of first communication nodes. In order to avoid interference with signals transmitted and received by the first communication nodes, the communication node 400 may try to communicate by predicting the time of occurrence of the interference.

For example, communication node 400 may include wireless personal area network equipment 410 and interference pattern recognition engine 420. The wireless personal area network equipment 410 may include a radio frequency (RF) physical layer 411 and a medium access control (MAC) layer 412. The communication node 400 may operate similarly or identically to the second communication protocol equipment 307 of FIG. 3.

The wireless physical layer 411 may process electrical signals. The MAC layer 412 may control the wireless physical layer 411. The wireless physical layer 411 and the MAC layer 412 perform control 413 and data signal transmission / reception 414 functions for the wireless personal area communication equipment 410 through the interface of the wireless personal area communication equipment 410. can do.

In addition, the wireless physical layer 411 and the MAC layer 412 may perform a radio measurement 415 function. The wireless measurement 415 may include energy detection (ED), link quality indication (LQI), clear channel assessment (CCA), and received signal strength indication (RSSI). It may include. The wireless personal area network equipment 410 may generate wireless measurement 415 result values. The wireless personal area network equipment 410 may transmit the parameters 401, which are the results of the wireless measurement 415, to the interference pattern recognition engine 420.

The wireless physical layer 411 may detect the transmission / reception packet of the communication node 400. The wireless physical layer 411 may obtain synchronization information based on the transmission / reception packet. The wireless physical layer 411 may transmit the synchronization information 402 to the interference pattern recognition engine 420.

The MAC layer 412 may store time information and channel allocation information for network access control. The MAC layer 412 may transmit the time information 403 and the channel assignment information 404 to the interference pattern recognition engine 420.

The interference pattern recognition engine 420 may perform deep learning using machine learning or neural network. For example, the interference pattern recognition engine 420 may perform deep learning based on the parameters 401, the synchronization information 402, the time information 403, and the channel assignment information 404 to calculate whether interference occurs. have. The interference pattern recognition engine 420 may generate control information based on a calculation result of whether interference occurs. The interference pattern recognition engine 420 may transmit the control information 405 to the MAC layer 412 via the interface.

4B is a conceptual diagram illustrating an interface and a calculation structure of the interference pattern recognition engine 520. The interference pattern recognition engine 520 may receive data X 421 from the wireless personal area network equipment 510. The X 421 may include a radio measurement result value P 422, channel allocation information C 423, synchronization information S 424, and time information t 425. X 421, P 422, C 423, S 424, and t 425 may each be matrix information.

Each parameter included in X 421 may be values measured by wireless personal area network equipment 410. Alternatively, each parameter included in the X 421 may be values received by the communication node 400 from the outside through the wireless network. For example, P 422 may correspond to parameter value 401 of FIG. 4A. C 423 may correspond to channel allocation information 404 of FIG. 4A. S 424 may correspond to synchronization information 424 of FIG. 4A. t 425 may correspond to time information 403 of FIG. 4A.

The interference pattern recognition engine 420 may generate prediction information about the interference and information about the actual interference based on the received data X 421. For example, the interference pattern recognition engine 420 may calculate the interference prediction value Y '(X) 428 based on the received data X 421, the weight matrix W 426, and the activation function 427. . The interference pattern recognition engine 420 may perform deep learning by updating the weight matrix W 426. In addition, the interference pattern recognition engine 420 may calculate the actual interference value Y 429 based on the received data X 421.

In this case, the interference pattern recognition engine 420 may calculate the cross entropy c (Y '(X), Y) 430 between the actual interference value Y 429 and the interference prediction value Y' (X) 428. . The interference pattern recognition engine 420 may differentiate the result of calculating the cross entropy c (Y ′ (X), Y) 430.

The interference pattern recognition engine 420 may calculate the updated weight matrix W '431 based on the weight matrix W 426 and the cross entropy c (Y' (X), Y) 430. For example, the updated weight matrix W '431 is the difference between the result of the derivative of the cross entropy c (Y' (X), Y) 430 multiplied by the learning rate α and the weight matrix W 426. have.

The interference pattern recognition engine 420 may end deep learning when the difference between the actual interference value Y 429 and the interference prediction value Y ′ (X) 428 is within a predetermined threshold range. However, since a change may occur in the interference pattern, the interference pattern recognition engine 420 may continuously perform deep learning to calculate the interference prediction value Y '(X) 428.

The actual interference value Y 429 or interference prediction value Y '(X) 428 can represent whether interference exists. Accordingly, the interference pattern recognition engine 420 may include a deep learning network for providing a binary classification function.

5A and 5B are flowcharts showing the operation sequence of the first communication node according to the second embodiment.

Referring to FIG. 5A, the first communication node may perform access point setting (S501). The first communication node can operate as an access point. The first communication node may operate the same as or similar to the communication node 400 of FIGS. 4A and 4B. In addition, the first communication node may operate similarly or identically to the first communication protocol devices 301-306 or the second communication protocol devices 307 and 308 of FIG. 3. For example, the first communication node can act as an access point of the second communication protocol equipments 307 and 308 of FIG. 3. The first communication node may perform basic network settings for operating as an access point.

The first communication node may determine whether to use a beacon signal (S502). When using the beacon signal, the first communication node may set a super frame and transmit a beacon signal (S503). For example, the beacon signal may be placed in front of the super frame. The first communication node may transmit a beacon signal with the super frame. If the first communication node does not use the beacon signal, it may proceed to step S509.

The first communication node may activate a random access function (S504). The first communication node may activate a random access function to correspond to a network control or an access connection request.

The first communication node may activate a time division access function (S505). The first communication node may activate the time division access function when the first communication node ends the random access period.

The first communication node may receive a radio parameter (S506). After activating the random access function and the time division access function, the first communication node may activate the reception function. In this case, the first communication node may receive a radio parameter from the second communication node. The second communication node may operate similarly or identically to the first communication protocol devices 301-306 or the second communication protocol devices 307 and 308 of FIG. 3.

The first communication node may determine whether the idle mode is performed (S507). The first communication node may set an idle mode when establishing a network. When the idle mode is set, the first communication node may wait for an idle period (S508). After waiting for the idle period, the first communication node may transmit a beacon signal (S503). If the idle mode is not set, the first communication node may transmit a beacon signal without waiting (S503).

The first communication node may perform an interference pattern prediction function (S509). The first communication node may perform the interference pattern prediction function based on the received radio parameter. The first communication node may transmit the super frame setting and the beacon based on the interference pattern prediction result (S503).

Referring to FIG. 5B, when the beacon signal is not used in step S502, the first communication node may proceed to step S510 to perform a random access function. The first communication node may receive a connection request signal from the second communication node. Alternatively, the first communication node may transmit a connection request signal to the second communication node. The first communication node may perform a connection request processing function.

The first communication node may activate a back off function (S511). The first communication node may activate the backoff function based on the connection request processing result.

The first communication node may acquire a radio parameter (S512). When the first communication node receives a signal or scans a channel in a random access process, the first communication node may acquire a radio parameter.

The first communication node may operate in an idle mode (S513). When the first communication node activates the backoff function, the first communication node may set the first communication node to an idle mode. The first communication node may wait for an idle period.

The first communication node may perform an interference pattern prediction function (S514). The first communication node may perform the interference pattern prediction function based on the obtained radio parameter. The first communication node may determine a random access or backoff timing based on the interference pattern prediction result value (S510 or S511).

6 is a flowchart showing an operation sequence of a second communication node according to the second embodiment.

Referring to FIG. 6, the second communication node may operate in a time division access scheme. The second communication node may operate the same as or similar to the communication node 400 of FIGS. 4A and 4B. In addition, the second communication node may operate similarly or identically to the first communication protocol devices 301-306 or the second communication protocol devices 307 and 308 of FIG. 3.

Also, the second communication node may operate the same as or similar to the second communication node of FIGS. 5A and 5B. For example, the second communication node can connect to the first communication node of FIGS. 5A and 5B.

The second communication node may perform a network connection and configuration function (S601). The second communication node may access the first communication node by performing a network connection and configuration function.

The second communication node may detect a beacon signal (S602). In a time division access scheme, the second communication node may initiate communication with the first communication node based on a control message sent from the first communication node. Accordingly, when the network configuration is completed, the second communication node may wait until the beacon signal is detected.

The second communication node may receive a beacon signal (S603). The second communication node may receive a beacon signal from the first communication node.

The second communication node may acquire a radio parameter (S604). The second communication node can obtain a radio parameter from the received beacon signal.

The second communication node may perform access information update and interference pattern prediction (S605). The second communication node may update the connection information based on the beacon signal. For example, the second communication node may update the connection information of the second communication node based on the connection information included in the beacon signal. The second communication node may determine the interference pattern prediction value based on the radio parameter.

The second communication node may transmit data (S606). The second communication node may determine a time point for transmitting data to the first communication node based on time information included in the beacon signal. The second communication node may transmit data to the first communication node at the determined time point. The data may include radio parameters and interference pattern prediction values.

When the data transmission is completed, the second communication node may return to step S602 to detect the beacons. The second communication node may operate in an idle mode in a section other than a section for receiving a beacon and a section for transmitting data. That is, the second communication node may be in a standby state except for a time for receiving a beacon and a time for transmitting data.

7 is a flowchart showing an operation sequence of a second communication node according to the second embodiment.

Referring to FIG. 7, the second communication node may operate in a random access method. The second communication node may operate the same as or similar to the communication node 400 of FIGS. 4A and 4B. In addition, the second communication node may operate similarly or identically to the first communication protocol devices 301-306 or the second communication protocol devices 307 and 308 of FIG. 3.

The second communication node may perform a reception energy detection function in operation S701. The second communication node may detect the presence or absence of a signal of the channel through the reception energy detection function. For example, the second communication node may determine whether a channel is present or not based on a result of detecting the received energy.

The second communication node may determine whether the channel is available (S702). The second communication node may determine whether the channel is available based on the presence or absence of the signal of the channel. For example, the second communication node may determine that the channel is available if there is a signal in the channel. On the other hand, if there is no signal in the channel, the second communication node may determine that the channel is unavailable.

The second communication node may transmit data (S703). The second communication node may transmit data to the first communication node via the channel if the channel is available.

The second communication node may activate the backoff function (S704). The second communication node may activate the backoff function after transmitting data to the first communication node.

The second communication node may determine whether a connection request signal is received (S705). The second communication node may determine whether a connection request signal is received from the first communication node.

The second communication node may receive data and obtain radio parameters (S706). The second communication node may receive data including radio parameters from the first communication node. The second communication node can obtain a radio parameter from the received data.

The second communication node may perform the interference pattern prediction function (S707). The second communication node may determine the interference pattern prediction value based on the obtained radio parameter.

The second communication node may activate the backoff function of step S704 by reflecting the interference pattern prediction value. For example, the second communication node can determine the backoff time of the second communication node based on the interference pattern prediction value.

When the access request signal is not received from the first communication node, the second communication node may deactivate the backoff function and then return to step S701 to perform a reception energy detection function. If the channel is not available according to the received energy detection result, the second communication node may activate the backoff function (S704).

The second communication node may store the radio parameter or interference pattern prediction value. In this case, the second communication node may transmit a radio parameter or interference pattern prediction value to the first communication node together with the data in step S604.

8 is a flowchart illustrating an operation sequence of a terminal according to the third embodiment.

Referring to FIG. 8, the terminal may perform the same or similar operation as that of the second communication node of FIG. 6 or the second communication node of FIG. 7.

The terminal may perform a step of receiving a radio signal from an access point (S801). The terminal may perform the step of determining the first interference prediction value based on the radio signal and radio measurement information (S802). The terminal may determine the interference interval based on the first interference prediction value or the second interference prediction value (S803). The terminal may perform a step of transmitting a data frame to the access point in a non-interfering period excluding the interference period (S804). The terminal may perform a step of transmitting a data frame to the terminal according to a back off procedure in the interference period (S805).

The radio signal may include time information, channel assignment information, and synchronization information for access control. The wireless measurement information may be first wireless measurement information determined by the terminal or second wireless measurement information determined by the access point. The wireless signal may include the second interference prediction value determined by the access point.

The wireless signal may include the second wireless measurement information. The second radio measurement information may include second energy detection information, second link quality indicator information, second clear channel assessment information, and a second received signal strength indicator. received signal strength indication) information.

The determining of the first interference prediction value may include determining the first radio measurement information. The first radio measurement information may include at least one of first energy sensing information, first link quality indicator information, first clear channel evaluation information, and first received signal strength indicator information.

The determining of the first interference prediction value may include: determining a first operation value obtained by calculating the radio measurement information, the time information, the channel allocation information, and the synchronization information and a predefined first weight matrix; And determining the first operation value as the first interference prediction value.

The determining of the first interference prediction value may include determining an actual interference value, determining a cross entropy value between the first interference prediction value and the actual interference value, and determining a derivative value for the cross entropy value. Determining a learning value that calculates the derivative value and a predetermined learning rate; and when the difference value between the first interference prediction value and the learning value exceeds a predetermined threshold value, the difference value is determined as a second value. Determining a weighting matrix, determining the wireless measurement information, the time information, the channel allocation information, and a second operation value obtained by calculating the synchronization information and the second weighting matrix, and the second operation value. And determining the first interference prediction value.

The determining of the first interference prediction value may include determining the first operation value as the first interference prediction value when a difference value between the first interference prediction value and the learning value is equal to or less than a predetermined threshold value. It may include.

Receiving the radio signal includes receiving a beacon from the access point, and updating the connection information of the terminal based on the beacon; wherein the beacon is the first radio measurement information, the It may include access information and allocation time information about the access point.

The transmitting of the data frame in the non-interfering period may include transmitting the data signal at an allocated time according to the allocation time information. The data frame may include at least one of the second radio measurement information and the second interference prediction value.

Receiving the wireless signal may include transmitting an association request message to the access point, and receiving an association response message for the association request message from the access point.

The transmitting of the data frame in the non-interfering period may include detecting received energy and determining whether to use a wireless channel based on the detection result. The data frame may include at least one of the second radio measurement information and the first interference prediction value.

9 is a flowchart showing an operation procedure of an access point according to the fourth embodiment.

Referring to FIG. 9, the access point may perform the same or similar operation as the first communication node of FIGS. 5A and 5B.

The access point may perform a step of transmitting a radio signal to the terminal in the non-interfering period excluding the interference period (S901). The access point may perform a step of receiving a data frame from the terminal in the non-interfering period (S902). The access point may perform a step of determining a first interference prediction value based on the data signal and radio measurement information (S903). The access point may perform the step of determining the interference interval based on the first interference prediction value or the second interference prediction value (S904). The access point may perform a step of performing a back off function in the interference period (905).

The wireless measurement information may be first wireless measurement information determined by the access point or second wireless measurement information determined by the terminal. The wireless signal may include the second interference prediction value determined by the terminal.

The wireless signal may include the second wireless measurement information. The second radio measurement information may include second energy detection information, second link quality indicator information, second clear channel assessment information, and a second received signal strength indicator. received signal strength indication) information.

Determining the interference prediction value comprises: determining the first radio measurement information; And determining the interference prediction value based on the first radio measurement information and time information for access control, channel allocation information, and synchronization information. The first radio measurement information may include at least one of first energy sensing information, first link quality indicator information, first clear channel evaluation information, and first received signal strength indicator information.

The determining of the interference prediction value may include determining a first operation value obtained by calculating the radio measurement information, the time information, the channel allocation information, and the synchronization information and a predefined first weight matrix. The method may include determining a first operation value as the interference prediction value.

The determining of the interference prediction value may include determining an actual interference value, determining a cross entropy value between the interference prediction value and the actual interference value, determining a derivative value for the cross entropy value, Determining a learning value that computes the differential value and a predefined learning rate; and when the difference value between the interference prediction value and the learning value exceeds a predetermined threshold value, determining the difference value as a second weight matrix. Determining a second operation value obtained by calculating the radio measurement information, the time information, the channel assignment information, and the synchronization information and the second weight matrix, and converting the second operation value into the interference prediction value. Determining may include.

The determining of the interference prediction value may include determining the first operation value as the interference prediction value when a difference value between the interference prediction value and the learning value is equal to or less than a predetermined threshold value.

The transmitting of the wireless signal may include determining whether to use a beacon, and when using the beacon, transmitting the wireless signal including the beacon to the terminal. The beacon may include the second radio measurement information, access information about the access point, and allocation time information. The wireless signal may include the first interference prediction value.

Receiving a data frame in the non-interfering period may include activating a random access function in a predetermined random access period, activating a time division access function when the random access period ends, and the random access function or The method may include receiving the data frame at the time allocated according to the allocation time information from the terminal through the time division access function. The data frame may include the first radio measurement information.

The transmitting of the wireless signal may include: activating a random access function when not using the beacon, receiving a connection request message from the terminal, and transmitting a connection response message for the connection request message to the terminal. And receiving the wireless signal.

The present invention discloses a terminal in a communication network. The terminal includes a processor; And a memory in which at least one instruction executed by the processor is stored, the at least one instruction receiving a radio signal from an access point and based on the radio signal and radio measurement information. Determine a first interference prediction value, determine an interference interval based on the first interference prediction value or the second interference prediction value, and transmit a data frame to the access point in a non-interference interval except for the interference interval, In the interference period, a data frame is transmitted to the access point according to a back off procedure. The radio signal includes time information, channel assignment information, and synchronization information for access control. The radio measurement information is first radio measurement information determined by the terminal or second radio measurement information determined by the access point. The wireless signal includes the second interference prediction value determined by the access point.

The methods according to the invention can be implemented in the form of program instructions that can be executed by various computer means and recorded on a computer readable medium. Computer-readable media may include, alone or in combination with the program instructions, data files, data structures, and the like. The program instructions recorded on the computer readable medium may be those specially designed and constructed for the present invention, or may be known and available to those skilled in computer software.

Examples of computer readable media include hardware devices that are specifically configured to store and execute program instructions, such as ROM, RAM, flash memory, and the like. Examples of program instructions include machine language code, such as produced by a compiler, as well as high-level language code that can be executed by a computer using an interpreter or the like. The hardware device described above may be configured to operate with at least one software module to perform the operations of the present invention, and vice versa.

Although described with reference to the embodiments above, those skilled in the art will understand that the present invention can be variously modified and changed without departing from the spirit and scope of the invention as set forth in the claims below. Could be.

Claims (20)

In the method of operation of a terminal in a communication network,
Receiving a wireless signal from an access point;
Determining a first interference prediction value based on the radio signal and radio measurement information;
Determining an interference interval based on the first interference prediction value or the second interference prediction value;
Transmitting a data frame to the access point in a non-interference interval except for the interference interval; And
And transmitting a data frame to the access point according to a back off procedure in the interference period.
The wireless signal includes time information, channel assignment information, and synchronization information for access control.
The wireless measurement information is first wireless measurement information determined by the terminal or second wireless measurement information determined by the access point,
The wireless signal includes the second interference prediction value determined by the access point. The method according to claim 1,
The second wireless measurement information included in the wireless signal may include second energy detection information, second link quality indicator information, second clear channel assessment information, and 2, at least one of the received signal strength indicator information, the method of operation of the terminal. The method according to claim 1,
Determining the first interference prediction value,
Determining the first wireless measurement information;
The first radio measurement information includes at least one of first energy sensing information, first link quality indicator information, first clear channel evaluation information, and first received signal strength indicator information. The method according to claim 1,
Determining the first interference prediction value,
Determining a first operation value obtained by calculating the radio measurement information, the time information, the channel assignment information, and the synchronization information and a predefined first weight matrix; And
And determining the first operation value as the first interference prediction value. The method according to claim 4,
Determining the first interference prediction value,
Determining an actual interference value;
Determining a cross entropy value between the first interference prediction value and the actual interference value;
Determining a derivative value for the cross entropy value;
Determining a learning value for calculating the differential value and a predefined learning rate;
Determining the difference value as a second weighting matrix when a difference value between the first interference prediction value and the learning value exceeds a predetermined threshold value;
Determining a second operation value obtained by calculating the radio measurement information, the time information, the channel assignment information, and the synchronization information and the second weight matrix; And
And determining the second operation value as the first interference prediction value. The method according to claim 5,
Determining the first interference prediction value,
And when the difference between the first interference prediction value and the learning value is equal to or less than a predetermined threshold value, determining the first operation value as the first interference prediction value. The method according to claim 1,
Receiving the wireless signal,
Receiving a beacon from the access point; And
Updating the access information of the terminal based on the beacons;
The beacon includes the first radio measurement information, the access information about the access point and the allocation time information, the operation method of the terminal. The method according to claim 7,
The step of transmitting the data frame,
Transmit the data signal at an allocated time according to the allocation time information,
The data signal includes at least one of the second radio measurement information and the second interference prediction value. The method according to claim 1,
Receiving the wireless signal,
Sending an association request message to the access point; And
Receiving a connection response message for the connection request message from the access point. The method according to claim 1,
The step of transmitting the data frame,
Detecting received energy; And
Determining whether to use a wireless channel based on the detection result;
The data frame includes at least one of the second radio measurement information and the first interference prediction value. In the method of operating an access point in a communication network,
Transmitting a radio signal to a terminal in a non-interference period except for an interference period;
Receiving a data frame signal from the terminal in the non-interference period;
Determining a first interference prediction value based on the data signal and radio measurement information;
Determining the interference interval based on the first interference prediction value or the second interference prediction value; And
And receiving a data frame from the terminal according to a back off procedure in the interference period.
The wireless measurement information is first wireless measurement information determined by the access point or second wireless measurement information determined by the terminal,
The wireless signal includes the second interference prediction value determined by the terminal. The method according to claim 11,
The second wireless measurement information included in the wireless signal may include second energy detection information, second link quality indicator information, second clear channel assessment information, and 2 at least one of received signal strength indicator information. The method according to claim 11,
Determining the interference prediction value,
Determining the first wireless measurement information; And
And determining the interference prediction value based on the first radio measurement information and time information for access control, channel allocation information, and synchronization information.
And the first radio measurement information comprises at least one of first energy sensing information, first link quality indicator information, first clear channel assessment information, and first received signal strength indicator information. The method according to claim 11,
Determining the interference prediction value,
Determining a first operation value obtained by calculating the radio measurement information, the time information, the channel assignment information, and the synchronization information and a predefined first weight matrix; And
Determining the first operation value as the interference prediction value. The method according to claim 14,
Determining the interference prediction value,
Determining an actual interference value;
Determining a cross entropy value between the interference prediction value and the actual interference value;
Determining a derivative value for the cross entropy value;
Determining a learning value for calculating the differential value and a predefined learning rate;
Determining the difference value as a second weight matrix when the difference value between the interference prediction value and the learning value exceeds a predetermined threshold value;
Determining a second operation value obtained by calculating the radio measurement information, the time information, the channel assignment information, and the synchronization information and the second weight matrix; And
Determining the second operation value as the interference prediction value. The method according to claim 15,
Determining the interference prediction value,
And determining the first operation value as the interference prediction value when the difference value between the interference prediction value and the learning value is equal to or less than a predetermined threshold value. The method according to claim 11,
The step of transmitting the wireless signal,
Determining whether to use a beacon; And
In the case of using the beacon, transmitting the radio signal including the beacon to the terminal;
The beacon includes the second radio measurement information, access information about the access point and allocation time information,
And wherein the wireless signal comprises the first interference prediction value. The method according to claim 17,
Receiving a data frame in the non-interference period,
Activating a random access function in a predetermined random access period;
Activating a time division access function when the random access interval ends; And
And receiving the data frame at an allocated time according to the allocation time information from the terminal through the random access function or the time division access function.
And the first radio measurement information that is the data frame. The method according to claim 17,
The step of transmitting the wireless signal,
Activating a random access function when not using the beacon;
Receiving a connection request message from the terminal;
Transmitting a connection response message for the connection request message to the terminal; And
Receiving the wireless signal; method of operating an access point. In a terminal in a communication network,
A processor; And
At least one instruction executed by the processor includes a memory (memory),
The at least one command is
Receive a radio signal from an access point, determine a first interference prediction value based on the radio signal and radio measurement information, and determine an interference interval based on the first interference prediction value or the second interference prediction value. Determine, transmit a data frame to the access point in the non-interference interval except the interference interval, and transmit the data frame to the access point according to a back off procedure in the interference interval,
The wireless signal includes time information, channel assignment information, and synchronization information for access control.
The wireless measurement information is first wireless measurement information determined by the terminal or second wireless measurement information determined by the access point,
The wireless signal includes the second interference prediction value determined by the access point.

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