KR20170042946A - Method for managing of buffer memory size and apparatus thereof - Google Patents

Abstract

The present invention relates to a method of controlling a buffer memory, and more specifically, to a method of controlling a buffer memory size, capable of flexibly controlling a buffer size in a network server which transfers data to a long range sub-GHz module (LoRa) device according to the number of data to be transmitted in an Internet over things (IoT) to which a LoRa technique is applied, and to an apparatus thereof. According to one embodiment of the present invention, in a method of controlling the buffer in a network server supporting IoT service provision between one or more control processing terminals and one or more application servers, the method comprises the following steps of: the network server adding the number of storage permitted packets that can be stored in the buffer to a message transferred to the application server from any one of control processing terminals to transfer the message to the corresponding application server; transferring the number of transmission waiting packets that are stored and queued in the buffer to the application server according to a request of the application server; and, when a buffer size increase request is received from the application server, increasing the buffer size according to the request of the application server.

Description

FIELD OF THE INVENTION The present invention relates to a buffer size control method, and more particularly,

The present invention relates to a buffer memory management method, and more particularly, to a method of managing a buffer memory in a network server (I / O) system for delivering data to a LoRa (Long Range Sub-Ghz Module) The present invention relates to a buffer size control method and apparatus for controlling a buffer size of a buffer size in a flexible manner according to the number of data transfers.

The contents described in this section merely provide background information on the present embodiment and do not constitute the prior art.

In order to popularize the Internet of the Things (IoT) service, it is necessary to transmit and receive a small amount of data of various sensors and control devices by securing reliability and security at a long distance. However, since the interfaces of the devices applied to the current IoT are not standardized, the versatility is low.

To solve these problems, LPWA (Low Power Wide Area) network technology has recently been attracting attention. LPWA communication technology is a term collectively referred to as IoT-based network technology that is specialized for small amount of data transmission that supports low battery life and long battery life requiring low-speed transmission. Typical examples of such LPWA network technology are LoRa Technology.

The LoRa (Long Range Sub-Ghz Module) is a low-power, long-distance communication protocol using 900MHz band frequency, which eliminates the need for many repeaters and APs to reduce the cost of infrastructure construction and provides greater scalability and cost for embedded applications Which means a communication protocol that can provide efficiency.

Such an IoT system using LoRa technology can be implemented as a LoRa device, a network server, and an application server. In this case, the LoRa device applied to the IoT service performs uplink-oriented data transmission in order to minimize battery consumption, and receives downlink data in a predetermined period or the like, or disconnects the network connection in the absence of downlink data reception Minimizing battery consumption.

In addition, the application server transmits various control information to the LoRa device via the network server. In general, the network server includes a buffer memory. When the LoRa device can not receive downlink data, or when the amount of downlink data is equal to the transmission rate If the number of data packets is greater than the threshold value, the data packet is temporarily stored in the buffer, and then the process of delivering the data packet to the LoRa device is controlled.

However, in the IoT system to which the LoRa technology is applied, the network server has a problem that it is difficult to ensure data transmission integrity by dropping data in excess of the allowable number of buffer memory storage due to a limited buffer size.

Korean Patent Laid-Open No. 10-2015-0073113, published on June 30, 2015 (name: information transmission / reception method and IOT device therefor)

The present invention provides a network server that is located between an application server and a LoRa device and transmits data transmitted by an application server to a LoRa device. A buffer size control method that can be flexibly controlled according to the number of data transfers, and an apparatus therefor.

It is another object of the present invention to provide a buffer size control method and apparatus for efficiently controlling a buffer size by appropriately increasing a buffer size of a network server according to a data transmission rate.

However, the object of the present invention is not limited to the above-mentioned objects, and other objects not mentioned can be clearly understood from the following description.

According to an aspect of the present invention, there is provided a buffer size management method for managing a buffer size in a network server supporting an Internet of Things (IoT) service between at least one control processing terminal and at least one application server, A method for managing a size of a network, the method comprising the steps of: the network server including a number of storage permission packets that can be stored in a buffer in a message transferred from a control processing terminal to an application server; Transmitting to the application server a number of queued transmission waiting packets stored in the buffer according to a request from the application server; And increasing the buffer size according to a request from the application server when a buffer size increase request is received from the application server.

In this case, the message means a Join Request message generated in the subscription procedure of the control processing terminal, and after the step of transmitting to the application server, the subscription request message transmitted from the application server in response to the subscription request message Transmitting an acknowledgment message to the control processing terminal; And transmitting the class type information to the application server when the class type information is transmitted from the control processing terminal.

At this time, the class type information includes application identification information, control processing terminal identification information, and a network session key generated based on a control processing terminal random value included in the subscription request message conforming to the LoRa (Long Range Sub-Ghz Module) Or may be encrypted with the application session key and delivered to the application server.

In addition, in the step of increasing the buffer size, the buffer size is controlled to increase to a predetermined maximum buffer size or less, and the predetermined maximum buffer size may be variably set according to the data packet transmission rate.

The method may further include changing the buffer size to an initial buffer size if the buffer usage is less than a predetermined rate for a preset period of time after the buffer size is increased.

According to an aspect of the present invention, there is provided a buffer size management method for managing a buffer size in an application server providing an IoT (Internet of Things) service in cooperation with a network server connected to at least one control processing terminal, A method for managing a size, the method comprising: receiving, by the application server, a message delivered by a control processing terminal including a buffer permission storable packet number from the network server; Querying the network server for the number of queued transmission waiting packets stored in the buffer; And requesting the network server to increase the buffer size if a value obtained by subtracting the number of packets waiting for transmission from the number of packets allowed to be stored and the number of packets to be transmitted is smaller than a preset value in the number of storage allowable packets .

Further, the present invention can provide a computer-readable recording medium on which a program for executing the above-described method is recorded.

Further, the present invention can provide a computer program stored in a computer-readable recording medium which is implemented to carry out the method as described above.

According to an aspect of the present invention, there is provided a network server for providing an Internet of Things (IoT) service between at least one control processing terminal and at least one application server, The number of packets allowed to be stored in the buffer confirmed by the buffer management unit is included in the message and is transmitted to the corresponding application server. When the request is received from the application server, A message processing unit for confirming the number of packets waiting for transmission through the buffer management unit and transmitting the confirmed number of packets waiting for transmission to the application server; And if the buffer size increase request is received from the application server through the message processing unit, the buffer size is increased according to a request from the application server, And a buffer management unit for controlling the buffer management unit.

According to an aspect of the present invention, there is provided an application server for providing an IoT (Internet of Things) service in cooperation with a network server connected to at least one control processing terminal, A network server buffer management unit for receiving a message transmitted from any control processing terminal including a number of storage allowable packets that can be stored in a server buffer and for inquiring the number of queued transmission waiting packets stored in the buffer, ; A data processing unit for checking the number of transmission packets to be transmitted to the control processing terminal; And if the value obtained by subtracting the number of transmission waiting packets confirmed by the network server buffer management unit and the number of transmission packets confirmed through the data processing unit from the storage allowable packet number is less than a preset value, And a buffer number calculator for requesting the server to increase the buffer size.

According to the buffer size control method and apparatus therefor according to the present invention, a network server that is located between an application server and a LoRa device and transmits data to be transmitted by an application server to a LoRa device, , All data packets can be transmitted to the LoRa device without discarded packets, thereby ensuring data transmission integrity.

In addition, according to the present invention, the buffer size of the network server can be controlled more efficiently by suitably increasing the buffer size according to the data transmission rate.

In addition, various effects other than the above-described effects can be directly or implicitly disclosed in the detailed description according to the embodiment of the present invention to be described later.

1 is a system configuration diagram showing a main configuration of an IoT system according to an embodiment of the present invention.
2 is a block diagram illustrating a main configuration of a network server according to an embodiment of the present invention shown in FIG.
3 is a block diagram illustrating a main configuration of an application server according to an embodiment of the present invention shown in FIG.
4 is a data flow chart for explaining a process of connecting a control processing terminal to a IoT system according to a general embodiment.
5 is a data flow chart for explaining a buffer size management method according to an embodiment of the present invention.
FIG. 6 is an exemplary diagram for explaining a buffer size management method according to an embodiment of the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS For a more complete understanding of the nature and advantages of the present invention, reference should be made to the following detailed description taken in conjunction with the accompanying drawings, in which:

In the following description and the accompanying drawings, detailed description of well-known functions or constructions that may obscure the subject matter of the present invention will be omitted. It should be noted that the same constituent elements are denoted by the same reference numerals as possible throughout the drawings.

The terms and words used in the following description and drawings are not to be construed in an ordinary sense or a dictionary, and the inventor can properly define his or her invention as a concept of a term to be described in the best way It should be construed as meaning and concept consistent with the technical idea of the present invention. Therefore, the embodiments described in the present specification and the configurations shown in the drawings are merely the most preferred embodiments of the present invention, and not all of the technical ideas of the present invention are described. Therefore, It is to be understood that equivalents and modifications are possible.

Also, terms including ordinal numbers such as first, second, etc. are used to describe various elements, and are used only for the purpose of distinguishing one element from another, Not used. For example, without departing from the scope of the present invention, the second component may be referred to as a first component, and similarly, the first component may also be referred to as a second component.

In addition, when referring to an element as being "connected" or "connected" to another element, it means that it can be connected or connected logically or physically. In other words, it is to be understood that although an element may be directly connected or connected to another element, there may be other elements in between, or indirectly connected or connected.

Also, the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The singular expressions include plural expressions unless the context clearly dictates otherwise. It is also to be understood that the terms such as " comprising "or" having ", as used herein, are intended to specify the presence of stated features, integers, It should be understood that the foregoing does not preclude the presence or addition of other features, numbers, steps, operations, elements, parts, or combinations thereof.

In addition, embodiments within the scope of the present invention include computer readable media having or carrying computer executable instructions or data structures stored in computer readable media. Such computer-readable media can be any available media that is accessible by a general purpose or special purpose computer system. By way of example, and not limitation, such computer-readable media can comprise RAM, ROM, EPROM, CD-ROM or other optical disk storage, magnetic disk storage or other magnetic storage devices, or in the form of computer- But is not limited to, a physical storage medium such as any other medium that can be used to store or communicate certain program code means of the general purpose or special purpose computer system, .

In the following description and claims, "network" or "communication network" is defined as one or more data links that allow electronic data to be transmitted between computer systems and / or modules. When the information is transmitted or provided to a computer system via a network or other (wired, wireless, or a combination of wired or wireless) communication connection, the connection may be understood as a computer-readable medium. Computer readable instructions include, for example, instructions and data that cause a general purpose computer system or special purpose computer system to perform a particular function or group of functions. The computer executable instructions may be binary, intermediate format instructions, such as, for example, assembly language, or even source code.

In addition, the invention may be practiced with other computer systems, including personal computers, laptop computers, handheld devices, multiprocessor systems, microprocessor-based or programmable consumer electronics, network PCs, minicomputers, mainframe computers, a pager, and the like. < RTI ID = 0.0 > [0040] < / RTI >

The invention may also be practiced in distributed systems environments where both local and remote computer systems linked by a combination of wired data links, wireless data links, or wired and wireless data links over a network perform tasks. In a distributed system environment, program modules may be located in local and remote memory storage devices.

Now, the main configuration of the IoT system according to the embodiment of the present invention will be described.

1 is a system configuration diagram showing a main configuration of an IoT system according to an embodiment of the present invention.

Referring to FIG. 1, an IoT system 1000 according to an embodiment of the present invention refers to a system for monitoring and collecting information acquired by a plurality of control processing terminals 100 and providing various services accordingly.

The control processing terminal 100 refers to a LoRa device to which the LoRa technology of the present invention is applied. The control processing terminal 100 includes various object devices This may be the case. For example, various objects such as various sensors, control devices, mobile phones, refrigerators, vacuum cleaners, washing machines, factory machines, and vending machines can be operated by the control processing terminal 100 of the present invention.

In this control processing terminal 100, the data transfer operation may be different for each LoRa type. For example, the class A may be classified according to whether the downlink data packet is received by the control processing terminal 100. The class A is a period in which the control processing terminal 100 receives a downlink data packet after a predetermined time (for example, 1 second) Class B is a class type in which the control processing terminal 100 can receive a downlink data packet every fixed period (for example, 128 seconds) , And class C means a class type that can always receive a downlink data packet.

The control processing terminal 100 can be assigned a class type at the time of initial setting, and the class type can be changed during service operation. In other words, the control processing terminal 100 of the present invention is set to Class B and changes to Class C according to a request from the application server 500, even when receiving a downlink data packet according to a predetermined period, Lt; / RTI >

Also, when the firmware is transferred from the application server 500, the control processing terminal 100 according to the embodiment of the present invention can delete the existing firmware and update the firmware with the new firmware. In order to update the firmware, the class of the control processing terminal 100 should be a C type and be capable of receiving a downlink data packet continuously. If the class of the control processing terminal 100 is A or B Type, the firmware update process can be performed by changing the class type to the C type according to the request of the application server 500.

In addition, the control processing terminal 100 of the present invention may perform a specified operation or perform a process according to a control command transmitted from the network server 300 or the application server 500. For example, when the temperature sensor is included, the control processing terminal 100 may sense the temperature and transmit the sensed temperature to the application server 500 via the network server 300, It is possible to perform operations such as lowering or raising the temperature in accordance with the transmitted control command.

In addition, the control processing terminal 100 of the present invention can perform a join procedure to access the application server 500 according to the LoRa communication protocol. When the registration procedure is completed, And transmit the generated information to the application server 500. [0050] FIG. At this time, the data packet transmitted and received between the control processing terminal 100 and the application server 500 can be encrypted and transmitted and received. The control processing terminal 100 encrypts the data packet and transmits it to the application server 500, And decode the data packet transmitted from the base station 500.

The gateway 200 is connected to the control processing terminal 100 and transmits information transmitted from the control processing terminal 100 to the network server 300 and transmits information transmitted from the network server 300 to the control processing terminal 100. [ As shown in FIG. In particular, the gateway 200 of the present invention can be a base station to which the LoRa technology is applied, and can transmit and receive packets in a spread spectrum CDMA (Code Division Multiple Access) scheme capable of simultaneous transmission. At this time, the gateway 200 of the present invention can tunnel and transmit information transmitted / received between the control processing terminal 100 and the network server 300.

The gateway 200 of the present invention can be connected to a plurality of control processing terminals 100. The gateway 200 transmits information from the control processing terminal 100 allocated or located within a predetermined radius to the network server 300, At this time, it can be transmitted including its own identification number. The network server 300 can confirm the gateway 200 to which the control processing terminal 100 is connected and performs a process of correctly transmitting the data packet transmitted from the application server 500 to the gateway 200 .

The network server 300 refers to a node that serves as an exchange for authenticating the control processing terminal 100 and supporting transmission and reception of packets. More specifically, the network server 300 can relay the registration procedure between the control processing terminal 100 and the application server. That is, when a join request message for connection to the application server 500 is transmitted from the control processing terminal 100, the application server 500 is checked using the application identification information included in the join request message, And transmits a join request message to the identified application server 500. When a confirmation message for a join request message is received from the application server 500, the network ID and control processing terminal address information are checked and transmitted to the application server 500, And the session key generation process for the session key.

When the subscription process is completed through the above process, the network server 300 can verify the integrity of data packets transmitted and received between the control processing terminal 100 and the application server 500. At this time, It is possible to perform the integrity verification.

The network server 300 according to the embodiment of the present invention checks the class type of the control processing terminal 100 when the data packet transmitted from the application server 500 to the control processing terminal 100 is received, If it is determined that the packet can not be received, the process of temporarily storing the data packet may be performed until the packet can be received. In addition, when data packet transmissions from a plurality of application servers 500 to the control processing terminal 100 are concentrated, a process for distributing the load can be performed.

In particular, the network server 300 according to the embodiment of the present invention can transmit information on the buffer size to the application server 500 using the message transferred from the control processing terminal 100 to the application server 500. [ For example, the network server 300 according to the embodiment of the present invention receives the subscription request message transmitted from the control processing terminal 100 to the application server 500 and transmits the subscription request message to the application server 500. At this time, It is possible to confirm the number of storage allowable packets that can be stored and transmit it to the application server 500. At this time, the message used by the network server 300 of the present invention is not limited to the subscription request message, and other types of messages transmitted from the control processing terminal 100 to the application server 500 may be used.

Thereafter, when the buffer size increase request is received from the application server 500, the network server 300 of the present invention can allocate a buffer space according to the request to increase the buffer size. In addition, the network server 300 of the present invention can return a buffer space allocated after a predetermined time to return to an initial buffer size.

The network controller 400 interlocks with the network server 300 to set connection related values. The network controller 400 may perform various functions in accordance with the policy of the service provider in association with the service provider managing the IoT system 1000 of the present invention. In addition, the network controller 400 supports the registration process of the new control processing terminal 100 to access the IoT system 1000 of the present invention, and can support the process of registering the new gateway 200.

The application server 500 is connected to the network server 300 and manages and controls a unique service for each application using various information transmitted from the control processing terminal 100 transmitted from the network server 300 . A plurality of such application servers 500 may exist and may provide various application services such as temperature control, radiation management, municipal waste management, shipping management, parking management, air pollution management, fire management, water pollution management, and the like. That is, the application server 500 of the present invention collects various kinds of information generated by the control processing terminal 100 via the network server 300 and transmits the corresponding control information to the control processing terminal 100).

In addition, the application server 500 according to the embodiment of the present invention can generate a session key for packet encryption, encrypt the packet using the generated session key, (100). ≪ / RTI >

In addition, the application server 500 according to the embodiment of the present invention can manage the version of the firmware and application for the control processing terminal 100 and can update the version thereof.

In particular, the application server 500 according to the embodiment of the present invention receives a message from one of the control processing terminals including the number of storage permission packets that can be stored in the buffer of the network server 300 from the network server 300, The network server 300 inquires and confirms the number of queued transmission waiting packets stored in the buffer and confirms the number of queued transmission packets by subtracting the number of queued transmission packets and the number of packets to be transmitted If the value of the buffer size is smaller than the preset value, the network server 300 may request the increase of the buffer size.

The user terminal 600 means a device of a user who wishes to use the IoT service to which the LoRa technology of the present invention is applied. In particular, the user terminal 600 of the present invention can access various information items collected by the control processing terminal 100 and transmitted to the application server 500 by accessing the IoT service application provided by the application server 500, It is possible to support the process of generating various control commands and transmitting them to the application server 500. For example, if the control processing terminal 100 is an environmental sensor that monitors the air environment in the plant, the user terminal 600 may serve to generate appropriate air environment information. The class type for the control processing terminal 100 to which the control processing terminal 100 is newly added can be set. Also, the user terminal 600 can receive various alarms transmitted from the application server 500. At this time, the user terminal 600 can receive messages in the form of SMS, MMS, or the like, or receive them through a pop-up message of the application.

The user terminal 600 of the present invention may include a user equipment, a mobile station (MS), a mobile terminal (MT), a subscriber station (SS), a portable subscriber station , An access terminal (PSS), an access terminal (AT), or the like, and may include all or some of functions of a mobile terminal, a subscriber station, a mobile subscriber station, and the like. The terminal 100 may be connected to a mobile terminal such as a smart phone, a tablet PC, a PDA (personal digital assistant), and a portable multimedia player (PMP) TV), a desktop computer, or the like may be used.

The user terminal 100 according to the present invention can not enumerate all of the variations of the portable device according to the convergence trend of the digital device. However, if the unit is of the same level as the above-mentioned units, The present invention is applicable to the user terminal 100 of the present invention.

A processor mounted in each apparatus constituting the IoT system 1000 according to the embodiment of the present invention can process program instructions for executing the method according to the present invention. In one implementation, the processor may be a single-threaded processor, and in other embodiments, the processor may be a multithreaded processor. Further, the processor is capable of processing instructions stored on a memory or storage device.

Hereinafter, a main configuration and an operation method of the network server 300 according to the embodiment of the present invention will be described.

2 is a block diagram illustrating a main configuration of a network server according to an embodiment of the present invention shown in FIG.

Referring to FIGS. 1 and 2, the network server 300 of the present invention may include a message processor 310 and a buffer manager 320.

When the subscription request message is received from any one of the control processing terminals 100, the message processor 310 includes the number of storage permission packets that can be stored in the buffer confirmed through the buffer management unit 320 in the subscription request message, The buffer management unit 320 confirms the number of queued transmission waiting packets stored in the buffer according to the request of the application server 500, To the application server (500).

The buffer management unit 320 checks the number of storage permission packets and the number of packets waiting for transmission according to a request of the message processing unit 310 and transmits a buffer size increase request from the application server 500 through the message processing unit 310 And increases the size of the buffer according to a request of the application server 500.

The main configuration of the network server 300 according to the embodiment of the present invention has been described above.

In an embodiment of the present invention, the message processing unit 310 transmits information on the buffer size to the application server 500 using the subscription request message transmitted from the control processing terminal 100 to the application server 500 as an example However, the present invention is not limited thereto. In other words, if the control processing terminal 100 is a message to be transmitted to the application server 500 and the message processing unit 310 can confirm the message, the message processing unit 310 may include information about the buffer size in the corresponding message To the application server 500.

Although the network server 300 of the present invention includes only the message processing unit 310 and the buffer management unit 320, the present invention is not limited to this configuration. It can process various processes that can occur in the IoT system to which the technology is applied, and can be configured to further include components for this. For example, from a physical point of view, it may further include an interface unit (not shown) responsible for transmission / reception processing of various messages and a storage unit (not shown) including a buffer memory and storing various information. An integrity verification unit (not shown) for performing integrity verification of messages transmitted and received between the control processing terminal 100 and the application server 500, information on the control processing terminal 100 or identification information on the gateway 200 And an authentication unit (not shown) for storing and performing authentication processing.

Hereinafter, the main configuration and operation method of the application server according to the embodiment of the present invention will be described.

3 is a block diagram illustrating a main configuration of an application server according to an embodiment of the present invention shown in FIG.

1 and 3, the application server 500 according to the embodiment of the present invention may include a network server buffer management unit 510, a buffer number calculation unit 520, and a data processing unit 530 .

The network server buffer management unit 510 receives information on the network server buffer size, that is, the number of storage permission packets that can be stored in the buffer, from the network server 300, And may inquire the number of queued transmission waiting packets stored in the buffer to the network server 300 to inquire about the number of waiting packets.

Then, the network server buffer management unit 510 checks whether the value obtained by subtracting the number of acknowledged packets from the number of confirmed acknowledged packets and the number of acknowledged packets transmitted through the data processing unit 530 from the number of acknowledged packets is smaller than a preset value The network server 300 may request the increase of the buffer size.

The data processing unit 530 may check the number of transmission packets to be transmitted to the control processing terminal 100.

The main configuration of the application server 500 according to the embodiment of the present invention has been described above.

The network server buffer management unit 510 of the application server 500 determines whether the buffer size of the network server 300 needs to be increased or not, The number of transmission packets confirmed through the data processing unit 530 is transmitted to the network server 300 according to the system implementation method and the network server 300 determines whether the buffer size needs to be increased directly You can judge.

Although the application server 500 of the present invention includes only the network server buffer management unit 510, the buffer number calculation unit 520 and the data processing unit 530, the present invention is not limited to this configuration , The application server 500 of the present invention can process various processes that can be generated in the IoT system to which the LoRa technology is applied, and may further comprise constituent elements for the various processes. For example, from a physical point of view, it may further include an interface unit (not shown) responsible for transmission / reception processing of various messages and a storage unit (not shown) for storing various information. From a functional point of view, A user management unit (not shown) for managing information on the user terminal 600 such as authentication and registration of the user terminal 600, a session key generating unit (not shown) for generating a session key, An encryption processing unit (not shown) for encrypting or decrypting messages transmitted and received by the terminal 100 as the session key, a terminal firmware management unit (not shown) for managing firmware version information for each control processing terminal, It should be noted that it is operable by many components,

The main configuration and operation of the network server 300 and the application server 500 according to the embodiment of the present invention have been described above.

The network server 300 and the application server 500 according to the embodiment of the present invention have the same hardware configuration as a typical Web server or network server. However, the software includes a program module implemented through a language such as C, C ++, Java, Visual Basic, Visual C, or the like.

On the other hand, the memory mounted on each device of the present invention stores information in the device. In one implementation, the memory is a computer-readable medium. In one implementation, the memory may be a volatile memory unit, and in other embodiments, the memory may be a non-volatile memory unit. In one implementation, the storage device is a computer-readable medium. In various different implementations, the storage device may comprise, for example, a hard disk device, an optical disk device, or any other mass storage device.

Although the present specification and drawings describe exemplary device configurations, the functional operations and subject matter implementations described herein may be embodied in other types of digital electronic circuitry, or alternatively, of the structures disclosed herein and their structural equivalents May be embodied in computer software, firmware, or hardware, including, or in combination with, one or more of the foregoing. Implementations of the subject matter described herein may be embodied in one or more computer program products, i. E. One for computer program instructions encoded on a program storage medium of the type for < RTI ID = 0.0 & And can be implemented as a module as described above. The computer-readable medium can be a machine-readable storage device, a machine-readable storage substrate, a memory device, a composition of matter that affects the machine readable propagation type signal, or a combination of one or more of the foregoing.

Hereinafter, a buffer size control method according to an embodiment of the present invention will be described.

First, before describing a buffer size control method according to an embodiment of the present invention, a process of connecting the control processing terminal 100 to the IoT system 1000 will be described first.

4 is a data flow chart for explaining a process of connecting a control processing terminal to a IoT system according to a general embodiment.

Referring to FIG. 4, in order to access the IoT system 1000, the control processing terminal 100 transmits a Join Request message to the network server 300 via the gateway 200. The control processing terminal 100 may transmit a join request message to the network server 300 via the gateway 200 when an event such as the first power on is generated. The join request message transmitted from the control processing terminal 100 to the network server 300 includes application identification information AppEUI, control processing terminal identification information DevEUI and control processing terminal random value DevNonce .

message parameter Join Request AppEUI (8bytes) DevEUI (8bytes) DevNonce (2bytes)

The application identification information is allocated by the application server 500, and indicates an application identifier set in advance. One control processing terminal 100 can transmit information to a plurality of application servers 500. For example, when the control processing terminal 100 plays a role of measuring the temperature, it can transmit the temperature information measured by the application server 500 providing the building management service, To the application server providing the measured temperature information. At this time, the application identification information may be assigned to each application service differently, and the control processing terminal 100 may transmit a subscription request including application identification information to the application server 500, Message to the network server (300).

On the other hand, the control processing terminal identification information is for distinguishing between the control processing terminals 100 and may be information allocated at the time of initial installation. Such control processing terminal identification information may be assigned by the network controller 400 or by a company that has created the control processing terminal 100. [

The control processing terminal random value means a value generated by the control processing terminal 100 for encryption and may be changed for each join procedure.

When the subscription request message is transmitted from the control processing terminal 100, the network server 300 receives the subscription request message via the gateway 200. In this case, the message transmitted through the gateway 200, in this example, the join request message may be transmitted including the gateway identification information, and the network server 300 stores the gateway identification information in correspondence with the control processing terminal identification information The information transmitted from the application server 500 may be transmitted to the control processing terminal 100 through the corresponding gateway.

The network server 300 checks the application server 500 using the application identification information of the subscription request message transmitted by the control processing terminal 100 (S103).

The application server 500 transmits a join request message to the identified application server 500 in step S105. The application server 500 performs a MIC (Message Integrity Code) check using an application key. That is, the control processing terminal 100 confirms whether the subscription request message transmitted through the gateway 200 and the network server 300 is a normal message or integrity. If it is determined that the message is a normal message, the application server 500 transmits a Join Request message confirmation message to the network server 300 (S109).

Then, the network server 300 confirms the network ID (NetID) and the control processing terminal address information (DevAddress) and transmits it to the application server 500 (S111).

The application server 500 receives the network session key (NW) using an application key (AppKey), an application random value (AppNonce), a network ID (NetID), and a control processing terminal random value (DevNonce) (S113) and generates an application session key (Application Session Key) using an application key (AppKey), an application random value (AppNonce), a network ID (NetID) and a control processing terminal random value (DevNonce) , And transmits the network session key (NW session key) to the network server 300 (S115).

The network server 300 stores the received network session key (S117). Here, the network server 300 can check the integrity of the message using the received network session key, or process the message itself.

Thereafter, the application server 500 may transmit a Join Accept message to the control processing terminal 100 (S119). At this time, the message delivered by the application server 500 may be transmitted to the control processing terminal 100 via the network server 300 and the gateway 200.

The admission approval message may include an application random value (AppNonce), a network ID (NetID), and control processing terminal address information (DevAddr).

message parameter Join Accept AppNonce
(3bytes) NetID
(3bytes) DevAddr
(4bytes) DLSetTings
(1bytes) RxDelay
(1bytes) CFList
(16 bytes, Optional)

At this time, the Join Accept message transmitted from the application server 500 through the network server 300 and the gateway 200 is encrypted with the application key AppKey (S119) May decrypt the subscription grant message with an application key (AppKey) (S121).

Thereafter, the control processing terminal 100 generates a network session key (NW Session Key) using an application key (AppKey), an application random value (AppNonce), a network ID (NetID), and a control processing terminal random value (DevNonce) And may generate an application session key (Application Session Key) (S123).

Thereafter, the control processing terminal 100 encrypts the data packet to be transmitted using the network session key or the application session key (S125), and transmits the data packet to the network server 300 via the gateway 200 (S129).

The network server 300 receives the network session key and performs integrity check using the network session key stored in step S117 and transmits the integrity check to the application server 500 when there is no problem in step S131. 500 may decrypt the data packet transmitted using the network session key or the application session key.

When this process is performed, the application server 500 can transmit the control information to the control processing terminal 100. That is, the application server 500 can transmit the control information corresponding to the received data packet to the control processing terminal 100 via the network server 300, If the number of data to be transmitted to the network server 300 is larger than the number of data to be transmitted to the network server 300, And then deliver it. However, when the buffer size of the network server 300 is limited and a data packet exceeding the buffer size is transmitted from the application server 500, the network server 300 can not store the transmitted data packet drop phenomenon occurs, which causes a problem that data integrity can not be guaranteed.

Accordingly, the network server 300 according to the embodiment of the present invention transmits information on its buffer size to the application server 500 in the above-described join procedure, and the application server 500 transmits If the buffer size required to be increased according to the number of data packets to be requested is calculated, the buffer size can be increased.

This will be described with reference to Figs. 5 and 6. Fig.

FIG. 5 is a data flow chart for explaining a buffer size management method according to an embodiment of the present invention, and FIG. 6 is an exemplary view for explaining a buffer size management method according to an embodiment of the present invention.

Referring to FIG. 5, the control processing terminal 100 according to an embodiment of the present invention transmits a Join Request message to the network server 300 via the gateway 200, (S201).

The network server 300 receives the registration request message from the control server 100 and transmits the registration request message to the application server 500. In step S105, Unlike the message, information on the buffer size is transmitted to the application server 500 (S203). In other words, after confirming the number of storage permission packets that the buffer can store, it transmits it to the application server 500.

The application server 500 of the present invention can perform the steps S107 to S117 of FIG. 4 in cooperation with the network server 300. When the normal procedure is completed, the application server 500 transmits a Join Accept ) Message (S205).

The control processing terminal 100 can perform steps S121 to S125 shown in FIG. 4, and can further confirm the set current class type (S207). The control processing terminal 100 can be set to any one of three class types, for example. The class A is a class type in which the control processing terminal 100 can receive a downlink data packet by a predetermined number of times at intervals of a predetermined time (for example, 1 second) after transmission of an uplink data packet. Is a class type capable of receiving a downlink data packet at a predetermined period (for example, 128 seconds), and the class C is a class type capable of always receiving a downlink data packet. The control processing terminal 100 can be assigned a class type at the initial setting, and the class type can be changed during the service.

After confirming the class type, the control processing terminal 100 can transmit the data packet to the application server 500 via the gateway 200 and the network server 300 together with the information on the class type (S209).

In step S209, the network server 300 may perform an integrity check process and transmit only the confirmed data packet to the application server 500. [

Then, the application server 500 determines whether a downlink packet to the control processing terminal 100 is generated (S211). That is, if a user or a predetermined control command for the data packet is generated after checking the data packet transmitted from the control processing terminal 100, the control processing terminal 100 transmits the control packet to the control processing terminal 100, (S211), the application server 500 inquires of the network server 300 about the number of queued transmission waiting packets stored in the buffer for transmission to the network server 300, and transmits a response thereto (S215).

The application server 500 having received the number of packets waiting for transmission subtracts a value obtained by adding the number of packets waiting to be transmitted and the number of packets waiting to be transmitted in step S213 from the buffer size confirmed in step S203 The network server 300 requests the buffer size increase (S217 to S219).

Upon receiving the request, the network server 300 increases the size of the buffer according to a request from the application server 500, and enlarges the buffer size to less than a predetermined maximum buffer size (S221). In order to suitably increase the buffer size of the network server according to the data transmission rate, the predetermined maximum buffer size may be variably set according to the data packet transmission rate of the network server 300.

Thereafter, the network server 300 may transmit information on completion of buffer size increase to the application server 500 (S223), and the application server 500 transmits the data packet including the control information to the network server 300 and / To the control processing terminal 100 via the gateway 200 (S225).

Referring to FIG. 6 as an example, it is assumed that the number of storage permission packets of the buffer allocated to the network server 300 is 5, as shown in FIG. 6A. In this case, If the application server 500 delivers two packets to the network server 300 as indicated by 803 in this state, the network server 300 transmits two packets to be transmitted Only one of the packets can be stored, so that the remaining one packet is dropped as indicated by 805. Accordingly, there is a problem in that the control processing terminal 100 has no way of receiving one of the two packets transmitted by the application server 500. [

In order to solve this problem, according to the present invention, as shown in FIG. 6B, the number of storage permission packets (5) and the number of packets waiting for transmission (4) in the buffer to which the network server 300 is allocated When the application server 500 transmits 2 packets as instructed by the application server 500, the application server 500 transmits the number of packets waiting to be transmitted and the number of packets to be transmitted (The number of storage allowable packets is 5) - (the number of transmission waiting packets is 4 + the number of transmission packets is 2). If the calculated value is smaller than the preset value, the application server 500 requests the network server 300 to increase the buffer size. At this time, the network server 300 requests to increase the buffer size by a value obtained by subtracting the calculated value from the predetermined value. That is, in the above-described example, since the preset value is 3 and the calculated value is -1, it is requested to increase the buffer size by 4 minus 3 minus -1.

The network server 300 receiving the request may increase the buffer size by the number of buffers according to the request of the application server 500, as shown in 809. At this time, the network server 300 of the present invention increases the buffer only when the number of buffers is equal to or less than the maximum number of buffers. If the number of buffers is greater than the maximum number of buffers, . The network server 300 stores all the data packets transmitted from the application server 500 without loss and sequentially transmits the packets to the control processing terminal 100 via the gateway 200 .

In addition, the network server 300 of the present invention can return to the initial buffer size and use the storage space more efficiently if the buffer usage amount is lower than a preset ratio for a predetermined time.

The buffer size management method according to the embodiment of the present invention has been described above.

The buffer size management method according to an embodiment of the present invention is a method of managing the buffer size using the subscription request message transmitted from the control processing terminal 100 to the application server 500 during the initial subscription procedure, Information is transmitted to the application server 500. However, the present invention is not limited to this. In other words, if the control server 100 transmits a message to the application server 500 and the network server 300 can receive the message, the network server 300 may use any message to determine the size of the buffer Information to the application server 500.

The buffer size management method according to an embodiment of the present invention is a method of managing the buffer size according to an embodiment of the present invention, in which the application server 500 receives the number of storage permission packets and the number of packets waiting for transmission allocated from the network server 300, The number of packets to be transmitted by the application server 500 during the data packet transmission may be determined by the network server 300 according to the system implementation method, The network server 300 may determine whether to increase the buffer size after checking the number of packets allowed to be stored and the number of packets waiting for transmission stored in the current buffer.

The buffer size management method of the present invention as described above may be provided in the form of a computer readable medium suitable for storing computer program instructions and data. A program recorded on a recording medium for implementing a buffer size management method according to an embodiment of the present invention includes a number of storage permission packets that can be stored in a buffer in a message delivered to an application server transmitted from any one control processing terminal Transmitting the number of packets waiting to be queued and stored in the buffer to the application server in response to a request from the application server; when the buffer size increase request is received from the application server, Receiving a message delivered by one of the control processing terminals including the number of storage allowable packets that can be buffered from the network server, such as increasing the buffer size in response to a request from the network server, In The method comprising the steps of: querying the number of packets waiting for transmission and checking if the value obtained by subtracting the number of packets waiting for transmission from the number of packets waiting for transmission and the number of packets to be transmitted is smaller than a preset value; A step of requesting an increase, and the like.

At this time, the program recorded on the recording medium can be read and installed in the computer and executed, thereby executing the above-described functions.

In order to allow a computer to read a program recorded on a recording medium and to execute functions implemented by the program, the above-mentioned program may be stored in a computer-readable medium such as C, C ++, JAVA, machine language, and the like.

The code may include a function code related to a function or the like that defines the functions described above and may include an execution procedure related control code necessary for the processor of the computer to execute the functions described above according to a predetermined procedure. In addition, such code may further include memory reference related code as to what additional information or media needed to cause the processor of the computer to execute the aforementioned functions should be referenced at any location (address) of the internal or external memory of the computer . In addition, when a processor of a computer needs to communicate with any other computer or server that is remote to execute the above-described functions, the code may be stored in a memory of the computer using a communication module of the computer, It may further include a communication-related code such as how to communicate with another computer or a server, and what information or media should be transmitted or received during communication.

Such computer-readable media suitable for storing computer program instructions and data include, for example, magnetic media such as hard disks, floppy disks and magnetic tape, compact disk read only memory (CD-ROM) Optical media such as a DVD (Digital Video Disk), a magneto-optical medium such as a floppy disk, and a ROM (Read Only Memory), a RAM , Random Access Memory), flash memory, EPROM (Erasable Programmable ROM), and EEPROM (Electrically Erasable Programmable ROM). The processor and memory may be supplemented by, or incorporated in, special purpose logic circuits.

The computer readable recording medium may also be distributed over a networked computer system so that computer readable code can be stored and executed in a distributed manner. The functional program for implementing the present invention and the related code and code segment may be implemented by programmers in the technical field of the present invention in consideration of the system environment of the computer that reads the recording medium and executes the program, Or may be easily modified or modified by the user.

While the specification contains a number of specific implementation details, it should be understood that they are not to be construed as limitations on the scope of any invention or claim, but rather on the description of features that may be specific to a particular embodiment of a particular invention Should be understood. Certain features described herein in the context of separate embodiments may be implemented in combination in a single embodiment. Conversely, various features described in the context of a single embodiment may also be implemented in multiple embodiments, either individually or in any suitable subcombination. Further, although the features may operate in a particular combination and may be initially described as so claimed, one or more features from the claimed combination may in some cases be excluded from the combination, Or a variant of a subcombination.

Likewise, although the operations are depicted in the drawings in a particular order, it should be understood that such operations must be performed in that particular order or sequential order shown to achieve the desired result, or that all illustrated operations should be performed. In certain cases, multitasking and parallel processing may be advantageous. Also, the separation of the various system components of the above-described embodiments should not be understood as requiring such separation in all embodiments, and the described program components and systems will generally be integrated together into a single software product or packaged into multiple software products It should be understood.

The present invention relates to a buffer memory management method, and more particularly, to a method of managing a buffer memory in a network server (I / O) system for delivering data to a LoRa (Long Range Sub-Ghz Module) The present invention relates to a buffer size control method and apparatus for controlling a buffer size of a buffer size in a flexible manner according to the number of data transfers.

According to the present invention, since the network server flexibly controls the buffer size according to the number of data transmission, all data packets can be transferred to the LoRa device without discarding packets, thereby ensuring data transmission integrity. Can contribute to the development of the IoT service industry.

In addition, since the present invention is not only possible to be marketed or operated, but also can be practically and practically carried out, it is industrially applicable.

100: control processing terminal 200: gateway
300: network server 310: message processor
320: buffer management unit 400: network controller
500: Application Server 510: Network Server Buffer Management Unit
520: buffer number calculator 530: data processor
1000: IoT system

Claims (10)

A method of managing a buffer size in a network server supporting provision of an Internet of Things (IoT) service between at least one control processing terminal and at least one or more application servers,
The network server comprising:
Transmitting a message transmitted from any one of the control processing terminals to the application server, including a number of storage permission packets that can be stored in the buffer, to the corresponding application server;
Transmitting to the application server a number of queued transmission waiting packets stored in the buffer according to a request from the application server; And
Increasing the buffer size according to a request from the application server when a buffer size increase request is received from the application server;
Wherein the buffer size management method comprises: The method according to claim 1,
The message
Means a Join Request message generated in the subscription procedure of the control processing terminal,
After forwarding to the application server,
Transmitting a subscription grant message from the application server to the control processing terminal in response to the subscription request message; And
Transmitting the class type information to the application server when the class type information is transmitted from the control processing terminal;
Further comprising the steps of: 3. The method of claim 2,
The class type information includes
Encrypted with a network session key or an application session key generated based on application identification information, control processing terminal identification information, and control processing terminal random value included in the subscription request message conforming to the LoRa (Long Range Sub-Ghz Module) communication protocol, And transmitted to the application server. The method according to claim 1,
In increasing the buffer size,
And controls the buffer size to be increased below a preset maximum buffer size,
Wherein the predetermined maximum buffer size is variably set according to a data packet transmission rate. The method according to claim 1,
After increasing the buffer size,
Changing the buffer size to an initial buffer size if the buffer usage is less than a predetermined rate for a predetermined time;
Further comprising the steps of: A method for managing buffer size in an application server providing IoT (Internet of Things) service in cooperation with a network server connected to at least one control processing terminal,
The application server comprising:
Receiving a message transmitted from any one of the control processing terminals including the number of storage permission packets that can be buffered from the network server;
Querying the network server for the number of queued transmission waiting packets stored in the buffer; And
Requesting the network server to increase the buffer size if a value obtained by subtracting the number of packets waiting for transmission from the number of packets allowed to be stored and the number of packets to be transmitted is smaller than a predetermined value in the storage allowable packet count;
Wherein the buffer size management method comprises: A computer-readable recording medium on which a program for executing the method according to any one of claims 1 to 6 is recorded. A computer program stored in a computer-readable medium embodied thereon for carrying out the method recited in any one of claims 1 to 6. A network server for supporting an Internet of Things (IoT) service between at least one control processing terminal and at least one application server,
The network server
When a message is transmitted from any one of the control processing terminals, the message is included in the message and stored in the buffer according to the request of the application server. A message processing unit for confirming the number of queued transmission waiting packets through the buffer management unit and delivering the confirmed number of packets waiting for transmission to the application server; And
Wherein the buffer size increase request is received from the application server when the buffer size increase request is received from the application server through the message processing unit, A buffer management unit;
And a network server. An application server for providing an Internet of Things (IoT) service in cooperation with a network server connected to at least one control processing terminal,
The application server
Receiving a message from one of the control processing terminals including the number of storage permission packets storable in the network server buffer from the network server and inquiring of the network server about the number of queued transmission waiting packets stored in the buffer A network server buffer management unit for checking;
A data processing unit for checking the number of transmission packets to be transmitted to the control processing terminal; And
If the value obtained by subtracting the number of transmission waiting packets confirmed through the network server buffer management unit and the number of transmission packets confirmed through the data processing unit from the number of storage allowable packets is less than a preset value, A buffer number calculator for requesting a buffer size increase;
The application server comprising:

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