KR20190028157A - Terminaal device and networlk device, control method thereof - Google Patents

Abstract

Disclosed in the present invention is a technology capable of increasing transmission success rate of downlink packet by proposing an improved downlink packet transmission method in consideration of mobility of an Internet of things (IoT) terminal and/or a dynamic periodic uplink packet transmission method, thereby improving the quality of an IoT service.

Description

TECHNICAL FIELD [0001] The present invention relates to a terminal device, a network device, and a method of operating the device.

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to Internet (IoT) technology, and more particularly, to a downlink message transmission technology considering mobility of Internet terminals.

Internet of Things (IoT) technology, which connects information of living things through wired / wireless networks in various fields such as healthcare, remote meter reading, smart home, smart car and smart farm, is attracting attention.

The following is a brief description of the IoT network structure for providing the Internet (IoT) service based on the Internet (IoT) technology.

The IoT network includes an object Internet terminal (IoT terminal) that periodically transmits report data, a customer who has an application for object Internet (hereinafter referred to as " IoT application ") for checking report data of the remote IoT terminal and controlling the IoT terminal A gateway (e.g., IoT base station) that performs message transmission / reception between a terminal, a network device (or IoT app server) that connects the IoT terminal and a customer terminal (IoT app) via a wired / .

The quality of the Internet (IoT) service provided in the IoT network structure is greatly influenced by the success rate of the uplink message / downlink message transmission / reception between the three nodes of the IoT terminal / IoT base station / network device.

In the case of an uplink in which an IoT terminal transmits an uplink message to a network device, since the IoT terminal transmits an uplink message in a broadcast manner, and two or more IoT base stations receive and transmit the uplink message to the network device, The transmission success rate of the message is excellent.

On the other hand, in case of a downlink in which the network device transmits a downlink message to the IoT terminal, the network device transmits a downlink message to one downlink base station to the IoT terminal, and the downlink base station, Therefore, it can be considered that the transmission success rate of the downlink message depends on which downlink base station is used.

In this regard, the network device determines the IoT base station, which is used in the latest successful transmission of the downlink message, as the downlink base station to the IoT terminal, and then determines a down And transmits the downlink message to the link base station.

That is, in the current Internet Internet Protocol (IoT) technology, the downlink message transmission scheme is a scheme in which the network device uses the IoT base station used for the most recent successful downlink message transmission success for the IoT terminal as a downlink base station, Is not considered.

Therefore, if the IoT terminal moves to the coverage of another IoT base station without transmitting / receiving a message to / from the network device, the network device transmits the downlink message to the downlink base station that has decided to transmit the downlink message to the IoT terminal This downlink message will not be received at the IoT terminal and the transmission of this downlink message will fail.

That is, the current downlink message transmission method has a problem that the transmission success rate of the downlink message is significantly lowered when the IoT terminal moves without sending / receiving a message to / from the network device.

However, the current Internet (IoT) technology does not suggest a method for transmitting the downlink message considering the mobility of the IoT terminal when the IoT terminal moves without sending / receiving a message to / from the network device.

Accordingly, the present invention proposes an improved downlink message transmission scheme (technique) in consideration of the mobility of the IoT terminal, thereby enhancing the transmission success rate of the downlink message.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and it is an object of the present invention to provide an improved downlink message transmission scheme (technology) in consideration of mobility of an IoT terminal, There is height.

According to a first aspect of the present invention, there is provided a terminal device comprising: a list management unit for managing a base station list indicating at least one base station that can communicate with, based on a signal received from a peripheral base station; A determination unit for comparing the most recently reported base station list and the changed base station list when the base station list is changed; And transmitting the changed base station list or the information of the specific base station involved in the change of the base station list to the network device when the determination is made, And the like.

Preferably, the transmitting unit inserts an identifier different from an uplink message in which the terminal periodically transmits report data to the changed base station list or a specific uplink message transmitting information of the specific base station, Thereby enabling the network device to distinguish the specific uplink message.

Preferably, the determining unit may report the changed base station list or the information of the specific base station when the changed base station list is changed by more than a preset specific change ratio with respect to the most recently reported base station list.

According to a second aspect of the present invention, there is provided a network device comprising: a classifier for classifying a specific uplink message for managing a BS list in an uplink message received from a terminal; An update unit for updating the base station list of the terminal managed by the terminal based on the base station list or the information of the base station identified from the specific uplink message; And a controller for transmitting a downlink message to be transmitted to the mobile station to a downlink base station selected based on the base station list of the mobile station.

Preferably, the update unit updates the list of base stations of the terminal to a list of base stations identified from the specific uplink message, or adds or deletes the base stations based on information of a specific base station identified from the specific uplink message. And update the base station list of the terminal.

Preferably, the control unit may select all the base stations included in the base station list of the terminal as a downlink base station for the terminal.

Preferably, if the downlink message of the terminal transmitted to the downlink base station is confirmed to be a transmission failure, the control unit controls the downlink base station of the downlink base station located within a certain range based on the location of the downlink base station. The UE may attempt to retransmit the downlink message.

Preferably, if the downlink message of the terminal is confirmed to be successfully transmitted, the update unit updates a base station list of the terminal by adding a specific peripheral base station whose transmission success is confirmed in the neighbor base stations of the downlink base station can do.

According to a third aspect of the present invention, there is provided a method of operating a terminal device, the method comprising: managing a base station list indicating at least one base station capable of communicating based on a signal received from a peripheral base station; Comparing the most recently reported base station list and the changed base station list when the list of base stations is changed; And transmitting the changed base station list or the information of the specific base station involved in the change of the base station list to the network device when the determination is made, And a transmission step of allowing the mobile terminal to manage the mobile terminal.

Preferably, the determining step may report the changed base station list or the information of the specific base station when the changed base station list is changed by more than a preset specific change ratio with respect to the most recently reported base station list.

According to a fourth aspect of the present invention, there is provided a method of operating a network device, the method comprising: classifying a specific uplink message for managing a BS list in an uplink message received from the MS; An update step of updating a base station list of the terminal managed by the terminal based on the base station list or information of the base station identified from the specific uplink message; And a downlink transmission step of transmitting a downlink message for transmission to the terminal to a downlink base station selected based on the base station list of the terminal.

Preferably, the updating step updates the base station list of the terminal to a list of base stations confirmed from the specific uplink message or adds the specific base station based on information of a specific base station identified from the specific uplink message Or update the list of base stations of the terminal.

Advantageously, the downlink transmission step may select all the base stations included in the base station list of the mobile station as a downlink base station for the mobile station

Preferably, if it is determined that the downlink message of the terminal transmitted to the downlink base station is a transmission failure, the downlink base station of the downlink base station, which is located within a certain range based on the location of the downlink base station, Attempting to retransmit the downlink message; And updating a list of base stations of the terminal by adding a specific peripheral base station whose transmission success is confirmed among neighboring base stations of the downlink base station, when the downlink message of the terminal is confirmed as a successful transmission have.

Accordingly, according to the terminal device, the network device, and the operation method of the device of the present invention, it is possible to increase the transmission success rate of the downlink message by proposing the improved downlink message transmission method considering the mobility of the Internet (IoT) Therefore, the effect of improving the quality of the Internet (IoT) service can be obtained.

FIG. 1 is an exemplary diagram illustrating a structure of an Internet (IoT) network to which the present invention is applied.
2 is a block diagram illustrating a configuration of a terminal device according to a preferred embodiment of the present invention.
3 is a block diagram illustrating a configuration of a network device according to a preferred embodiment of the present invention.
4 is a flowchart illustrating a downlink message transmission process according to a preferred embodiment of the present invention.
5 is a flowchart illustrating an operation method of a terminal according to a preferred embodiment of the present invention.
6 is a flowchart illustrating an operation method of a network device according to a preferred embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings.

FIG. 1 shows a network structure of Internet of Things (IOT) to which the present invention is applied.

As shown in FIG. 1, the Internet IoT network structure to which the present invention is applied includes an Internet point of interest (IoT terminal, for example, terminal 100) that periodically transmits report data, A customer terminal (not shown) provided with an IoT app for checking report data and controlling an object Internet terminal, a network device 200 for connecting the IoT terminal and the customer terminal (IoT app) through a wired / wireless network, (IoT base stations, for example, base stations 1, 2,... 13) serving as gateways for transmitting and receiving messages between network devices 200.

The quality of the Internet (IoT) service provided in the IoT network structure is greatly influenced by the success rate of the uplink message / downlink message transmission / reception between the three nodes of the IoT terminal / IoT base station / network device.

In the case of the uplink in which the IoT terminal transmits the uplink message to the network device, the IoT terminal, for example, the terminal 100 transmits report data (uplink message) in a broadcast manner every predetermined reporting period, Since two or more IoT base stations (for example, base stations 5, 6 and 10) receive and transmit to the network device 200, the transmission success rate of the uplink message is excellent.

On the other hand, in case of the downlink in which the network device 200 transmits a downlink message to the IoT terminal, the network device 200 transmits a downlink message to one downlink base station determined by the IoT terminal, for example, And transmits the downlink base station to the terminal 100.

Therefore, the transmission success rate of the downlink message can be considered to be influenced by which IoT base station determines / uses the downlink base station when the downlink message is transmitted.

On the other hand, the IoT terminal is divided into several types according to the downlink message receiving method. The IoT terminal is mainly classified into a type capable of receiving a downlink message only when the IoT terminal first transmits an uplink message And a type in which a downlink message can be received even if the IoT terminal does not transmit the uplink message first (hereinafter referred to as a downlink message reception free type).

The network device 200 will transmit the downlink message to the IoT terminal only when the uplink message is received first, for the IoT terminal operating with the downlink message reception restriction type.

Accordingly, the network device 200 transmits, to each of the IoT terminals operating in the downlink message reception restriction type, one of the IoT base stations (e.g., base stations 5, 6, and 10) The base station having the best SNR (Signal to Noise Ratio) is determined as a downlink base station, and a downlink message to the IoT terminal is transmitted to the downlink base station.

On the other hand, the network device 200 will transmit the downlink message to the IoT terminal even when the uplink message is not received, for the IoT terminal operating in the downlink message reception free type.

Therefore, the network device 200 transmits to the IoT terminal, for example, the terminal 100 operating as a downlink message reception free type, an IoT base station (e.g., base station 6) used in the most recent (or immediately preceding) And then transmits the downlink message to one downlink base station 6 that has been determined to transmit the downlink message to the terminal 100. [

That is, the downlink message transmission scheme for the free type IoT terminal of the downlink message reception type includes a situation where the IoT terminal may move between the latest (or immediately previous) successful downlink message transmission time point and the current downlink message transmission time point, That is, the mobility of the IoT terminal is not considered.

Therefore, if the free type IoT terminal of the downlink message reception type moves to the coverage of another IoT base station without transmitting and receiving messages with the network device 200, the network device 200 transmits the downlink message to the IoT terminal Since the downlink message is transmitted to the determined downlink base station, this downlink message will not be received at the IoT terminal, and the transmission of this downlink message will fail.

That is, the downlink message transmission scheme for the IoT terminal of the free type of the current downlink message reception type has a problem that the transmission success rate of the downlink message is significantly lowered when the IoT terminal moves without sending / receiving a message to / from the network device 200 have.

Accordingly, the present invention proposes an improved downlink message transmission scheme (technique) considering the mobility of the IoT terminal with respect to the IoT terminal of a free type downlink message reception type, thereby enhancing the transmission success rate of the downlink message.

Basically, the present invention considers a structure in which an IoT base station serving as a gateway in a IoT network transmits a periodic signal (e.g., a beacon signal).

That is, in the present invention, on the assumption that the IoT base station periodically transmits the beacon signal, the IoT terminal recognizes a situation where the base station that can receive the downlink message changes based on the beacon signal of the IoT base station , And proposes a new structure for notifying the network device 200 of the new structure, thereby realizing an improved downlink message transmission scheme (technology) in consideration of the mobility of the IoT terminal.

More specifically, the present invention proposes a terminal apparatus and a network apparatus that realize the improved downlink message transmission scheme (technique) proposed by the present invention.

Hereinafter, a terminal device according to a preferred embodiment of the present invention will be described in detail with reference to FIG.

A terminal device (100) of the present invention includes a list management unit (110) for managing a list of base stations indicating at least one base station that can communicate with each other based on signals received from peripheral base stations, A determination unit 120 for comparing the reported base station list and the changed base station list, and determining whether to report the changed base station list or the specific base station information involved in changing the base station list to the network device 200 to allow the network device 200 to manage the list of base stations to use when selecting the downlink base station to the terminal device 100. [

The terminal device 100 of the present invention means an IoT terminal in the Internet of Things (IoT) network, and the base station mentioned below will refer to an IoT base station.

Hereinafter, for convenience of description, it is assumed that the terminal device 100 is located between the base stations 5, 6, and 10 as shown in FIG.

The list management unit 110 manages a list of base stations indicating at least one base station that can communicate with, based on signals received from peripheral base stations.

1, the terminal apparatus 100 selects, from among the beacon signals transmitted from the base stations, the neighboring base stations located near the terminal apparatus 100, that is, the base stations 5, 6, 10 Can receive a beacon signal to be transmitted.

Based on the beacon signals received from the peripheral base stations 5, 6, and 10, the list management unit 110 stores a list of base stations (e.g., base station list L indicating base stations 5, 6, and 10) Can be managed.

Thus, the terminal device 100 of the present invention manages the base station list based on the received beacon signal whenever a beacon signal is received from the neighbor base station.

When the base station list is changed, the determination unit 120 compares the most recently reported base station list and the changed base station list to determine whether to report the change.

That is, when the list of base stations is changed according to the base station list management by the list management unit 110, the determination unit 120 determines whether the list of the base stations reported most recently The list of base stations can be compared with the list of base stations that have been changed to judge whether or not the list of the changed base stations is reported.

Specifically, for example, the determination unit 120 determines whether or not the current changed base station list is changed by more than a predetermined specific change ratio (for example, X%) set with respect to the most recently reported base station list, : X%) or more.

Hereinafter, for convenience of explanation, it is assumed that the base station list L is the list of base stations that the terminal device 100 most recently reported.

1, it is assumed that the terminal apparatus 100 moves and receives a beacon signal of the base station 3 after the movement in a state of receiving only the beacon signal transmitted by the base stations 5, 6, and 10 before the movement do.

In this case, the terminal apparatus 100, particularly the list management unit 110, will add and change the base station 3 to the managed base station list (e.g., the base station list L indicating the base stations 5, 6 and 10) 6, 10, 3).

At this time, if the degree of change is less than a specific change rate (for example, X%) even if the base station list is changed (L-> L ') according to the base station list management by the list management unit 110 It will not be reported.

At this time, the specific change ratio (for example, X%) may be changed by the operator as a changeable ratio value according to the setting, or may be changed and set by an algorithm that automatically calculates an optimum value.

1, the beacon signal of the base station 10 is not received any more when the terminal device 100 continues to move and the beacon signal transmitted by the base stations 5, 6, 10, and 3 is received It is assumed that the beacon signal of the base station 1 is further received.

In this case, the terminal apparatus 100, particularly the list management unit 110 deletes the base station 10 and adds the base station 1 to the list of base stations being managed (e.g., the base station list L 'indicating the base stations 5, 6, (E.g., base station list L "indicating base station 5,6,3,1).

At this time, the determination unit 120 determines that the presently changed base station list L " has been changed in accordance with the base station list management by the list management unit 110 by more than a specific change rate (for example, X%) And to report it.

When it is determined that the determination unit 120 reports the result of the determination, the transmitting unit 130 transmits information on the changed base station list or the specific base station involved in changing the base station list to the network device 200.

For example, when it is determined to report the determination result of the determination unit 120, the transmission unit 130 transmits (transmits) the specific uplink message including the changed base station list L "itself to the network device 200 To the network device 200 in the manner of transmitting the base station list L "

For example, the transmitting unit 130 may transmit information (e.g., base station ID, addition or deletion) of base stations added or deleted in the specific base station involved in the change of the base station list L & And transmits the specific uplink message to the network device 200. In this way, the list of the changed base stations can be reported to the network device 200. [

That is, according to the above-described assumption, the transmitting unit 130 transmits, as information of the specific base station, information (e.g., base station ID, added) of the added base station 3,1 and information of the deleted base station 10 , And transmits the specific uplink message including the selected base station list L "to the network device 200 by transmitting (transmitting) the specific uplink message including the base station list L".

The specific uplink message transmitted by the terminal apparatus 100 is transmitted to the network apparatus 200 through the IoT base station (for example, the base station 5, 6, 3, 1) receiving the uplink message of the terminal apparatus 100, Lt; / RTI >

Meanwhile, in order to perform a function as the IoT terminal, the terminal device 100 of the present invention generates report data for each defined period and periodically transmits (transmits) an uplink message including the generated report data, Lt; RTI ID = 0.0 > 100 < / RTI >

Accordingly, the terminal apparatus 100 (particularly, the transmission unit 130) transmits an uplink message, in which the terminal device 100 periodically transmits the report data, to the specific uplink message transmitting the changed base station list or the information of the specific base station It is desirable to insert another identifier so that the network device 200 can identify a specific uplink message.

For example, a predefined standard value (hereinafter, FPort value_A) is included in the header of the uplink message transmitted by the terminal device 100, that is, the IoT terminal, more specifically, the Frame Port field in the header.

Accordingly, the terminal apparatus 100 (particularly, the transmission unit 130) maintains the FPort value_A in the uplink message periodically transmitting the report data, and transmits the specific uplink message (Hereinafter, FPort value_B) as another identifier.

As described above, according to the present invention, the terminal device receives the downlink message through the base station list management based on the beacon signal of the IoT base station on the assumption that the IoT base station periodically transmits the beacon signal And informs the network device 200 of the status of the change.

In particular, the terminal device of the present invention does not report to the network device 200 every time the base station list is changed, but when the situation where the downlink message itself can be received is changed by a certain level or more Is not less than a specific change rate (e.g., X%)), the network device 200 can report and notify.

If the IoT terminal reports and reports to the network device 200 every time the base station list is changed, there is a concern that a too frequent reporting situation may occur. This concern leads to unnecessary power consumption of the IoT terminal.

And this concern can be a bigger problem in the space where the base stations are concentrated.

However, the terminal device of the present invention can not be used only when the status in which it can receive a downlink message is changed by more than a certain level (when the degree of base station list change is more than a specific change rate (e.g., X%)) , The reporting interval by the terminal apparatus may be shortened or lengthened depending on the degree of movement of the terminal apparatus and the density of peripheral base stations.

In this regard, the terminal apparatus of the present invention reports a short period of time in a busy area of a terminal or in a dense space of a base station, and in a space where the terminal apparatus is moving slowly or in a non- It is possible to improve the transmission success rate of the downlink message considering the mobility of the IoT terminal by reporting a meaningful case while avoiding frequent reporting situations that may occur unnecessarily, It is possible to satisfactorily satisfy both concerns in terms of power consumption and message transmission load as well as concerns in the accuracy of the downlink base station.

Hereinafter, a network device according to a preferred embodiment of the present invention will be described in detail with reference to FIG.

The network device 200 of the present invention includes a classifying unit 210 for classifying a specific uplink message for managing a BS list in an uplink message received from a UE, An update unit 220 for updating a list of base stations of the mobile station managed by the mobile station based on information of the base station and a downlink message to be transmitted to the mobile station, And a control unit 230 for transmitting the data.

The network device 200 of the present invention is a network device for connecting an IoT terminal and a customer terminal (IoT app) in a matter Internet (IoT) network through a wired / wireless network. will be.

The classifying unit 210 classifies a specific uplink message for managing a BS list in an uplink message received from a UE.

Hereinafter, for convenience of explanation, the terminal 100 shown in FIG. 1 will be described as a terminal.

When an uplink message from the terminal 100 is received, the classifying unit 210 classifies whether the uplink message is an uplink message for periodic reporting data transmission or a specific uplink message for managing a base station list .

For example, if the standard value (hereinafter, FPort value_A) previously defined in the Frame Port field in the header is more specifically checked for the received uplink message than the header of the uplink message And an uplink message for reporting data transmission.

On the other hand, for the received uplink message, the classifier 210 concatenates the different values defined in the specific uplink message (hereinafter, FPort value_B) in the Frame Port field in the header more specifically than the header of the uplink message If it is confirmed, it can be classified into a specific uplink message for base station list management.

The update unit 220 updates the base station list of the terminal 100 managed by the terminal 100 based on the base station list identified from the specific uplink message or the information of the specific base station.

For example, for the uplink message for reporting data transmission divided in the classifying unit 210, the network device 200 may use the reporting data confirmed in the uplink message to perform data processing for the object Internet (IoT) service I will perform the whole process.

On the other hand, the network device 200 (in particular, the update unit 220) may determine the specific uplink message classified by the division unit 210 based on the information of the base station or the information of the specific base station, The base station list of the terminal 100 managed by the base station 100 will be updated.

Hereinafter, for convenience of explanation, it is assumed that the current base station list of the terminal 100 managed by the network device 100 is the base station list L indicating the base stations 5, 6, and 10.

More specifically, the update unit 220 can update the base station list of the terminal 100 with the base station list confirmed from the specific uplink message.

For example, when a specific uplink message including the base station list L "itself is transmitted from the terminal 100, the updating unit 220 may update the base station list L" Update the list.

In this case, the update unit 220 can update the base station list L managed by the terminal 100 to the base station list L ".

Meanwhile, the update unit 220 may update the base station list of the terminal 100 by adding or deleting the specific base station based on the information of the specific base station confirmed from the specific uplink message.

For example, the update unit 220 may update the specific information including the information of the specific base station, such as the information of the base station 3, 1 (for example, the base station ID, the addition) If the uplink message has been transmitted, it is possible to transmit the uplink message to the terminal 100 based on information (e.g., base station ID, addition) of the base station 3,1 from the specific uplink message and information (e.g. base station ID, 1 " from the base station list L managed by the terminal 100 and deletes the base station 10, thereby updating the base station list L of the terminal 100 to the base station list L ".

The control unit 230 transmits the downlink message to be transmitted to the terminal 100 to the downlink base station selected based on the base station list of the terminal 100, that is, the updated latest base station list L ".

That is, the network device 200 (particularly, the control unit 230) of the present invention determines (selects) one IoT base station used for transmitting the downlink message in which the existing network device succeeds most recently (or immediately before) A downlink base station is selected from a list of latest base stations updated based on a meaningful report (information of a base station and information of a specific base station) from the terminal 100, Message.

More specifically, the control unit 230 can select all the base stations included in the base station list of the terminal 100 as the downlink base station for the terminal 100. [

For example, assuming that the base station list L "(base stations 5, 6, 3, 1) is the updated latest station list of the terminal 100, the controller 230 transmits a downlink message for transmission to the terminal 100, List L "to the selected base stations 5, 6, 3 and 1, respectively.

Thus, in the present invention, since the range of the downlink message transmission is widened to two or more downlink base station coverage according to the base station list L "of the terminal 100 in the coverage of one downlink base station, Even if the terminal 100 of the mobile device 200 moves to the coverage of another base station without transmitting and receiving messages with the network device 200, the possibility that the downlink message transmitted by the network device 200 is received by the terminal 100 is significantly increased .

In addition, if the downlink message of the terminal 100 transmitted to the downlink base station, that is, the base station 5, 6, 3, 1, is confirmed to have failed to be transmitted, the controller 230 controls the downlink base station The UE 100 may try to retransmit the downlink message through the neighbor base station of the downlink base station.

The network device 200 of the present invention transmits a downlink message to the downlink base station if the uplink message is not returned from the terminal 100 within a predetermined time after the downlink message is transmitted from the terminal 100 It can be determined (confirmed) that the transmission of the downlink message has failed.

Of course, the network device 200 of the present invention transmits the downlink message of the terminal 100 when the response (uplink message) from the terminal 100 is returned within a predetermined time after the transmission of the downlink message of the terminal 100 (Confirmed) that the transmission is successful.

If it is determined that the downlink message of the terminal 100 transmitted to the downlink base station, i.e., the base station 5, 6, 3, 1, fails to be transmitted, the controller 230 determines the location of the downlink base station 5, The base station of the downlink base station located within a certain range can be identified.

Here, the predetermined range is a range that can be varied depending on the definition, and may be, for example, a range of radius X centered on the reference position.

The control unit 230 transmits the downlink message of the terminal 100 to the neighbor base stations of the downlink base stations 5, 6, 3 and 1, Lt; RTI ID = 0.0 > 100 < / RTI >

That is, when the downlink message transmission based on the base station list L "of the terminal 100 of the terminal 100 fails, the network device 200 (particularly, the control unit 230) It is desirable to retry transmission of the downlink message to the terminal 100 in a range wider than the range of the downlink message transmission failed.

To this end, it is assumed that the network device 200 knows the location information of each IoT base station in the present invention.

If it is confirmed that the downlink message of the retransmitted terminal 100 is successfully transmitted, the control unit 230 determines whether the downlink message of the downlink base station 5, 6, 3, And update the base station list of the terminal 100. [

As described above, the network device of the present invention selects a downlink base station from a list of latest base stations updated based on meaningful reports (base station list and specific base station information) from the terminal, Even if the terminal 100 of the free type of receiving the downlink message moves to the coverage of the other base station without transmitting or receiving a message with the network device 200, The possibility that the link message is received at the terminal can be significantly increased.

According to the present invention, in consideration of the mobility of the IoT terminal, even if the IoT terminal of the free type downlink message reception type moves without message transmission / reception, the downlink message transmitted by the network device can be successfully received at the IoT terminal By realizing the improved downlink message transmission scheme, it is possible to increase the transmission success rate of the downlink message, thereby improving the quality of the Internet service (IoT).

Hereinafter, a downlink message transmission process according to a preferred embodiment of the present invention will be described with reference to FIG.

Hereinafter, for convenience of description, it is assumed that the terminal 100 refers to the terminal 100 shown in FIG. 1 and that the terminal 100 is an IoT terminal of a free type of receiving a downlink message.

In the present invention, it is assumed that the IoT base station serving as a gateway in the IoT network transmits a periodic signal (e.g., a beacon signal).

The terminal 100 manages a base station list indicating at least one base station that can communicate with, based on signals received from peripheral base stations.

1, the terminal 100 selects one of the beacon signals transmitted from the base stations, that is, the beacon transmitted from the neighboring base stations located near the terminal 100, that is, the base stations 5, 6, (S1, S2, S3).

Accordingly, the terminal 100 manages a base station list (e.g., base station list L indicating base stations 5, 6, and 10) indicating at least one base station that can communicate with, based on the beacon signals received from the base stations 5, (S10).

When the list of base stations is changed, the terminal 100 determines that the current base station list is reported when the changed base station list is changed by more than a predetermined specific change ratio (for example, X%) with respect to the most recently reported base station list.

Hereinafter, for convenience of explanation, it is assumed that the base station list L is the list of base stations that the terminal 100 most recently reported.

For example, as shown in FIG. 1, when the terminal 100 moves and receives only the beacon signal transmitted by the base stations 5, 6, and 10 before the movement, the beacon signal of the base station 3 after the movement is received (S4).

In this case, the terminal 100 will add and change the base station 3 to the managed base station list (e.g., the base station list L indicating the base stations 5, 6, and 10) List L ') (S20).

At this time, the terminal 100 will judge that it is not reported (S25) even if the base station list is changed (L- > L ') if the degree of the change is less than a specific change rate (for example, X%).

1, when the terminal 100 continues to move and receives the beacon signal transmitted by the base stations 5, 6, 10, and 3, the beacon signal of the base station 10 is not received any more, 1 < / RTI > beacon signal.

In this case, the terminal 100 deletes the base station 10 and adds the base station 1 to the managed base station list (for example, the base station list L 'indicating the base stations 5, 6, 10 and 3) 6, 3, 1) (S30).

At this time, the terminal 100 may determine that the changed base station list L "is changed by more than a specific change rate (e.g., X%) with respect to the base station list L that has been reported most recently (S35).

In this case, the terminal 100 transmits the currently changed base station list or the information of the specific base station involved in the change of the base station list (S40) according to the determination result of step S35.

Then, the specific uplink message transmitted from the terminal 100 is transmitted to the network device 200 through the IoT base station (for example, the base station 5, 6, 3, 1) receiving the uplink message of the terminal 100 Will be.

Meanwhile, the specific uplink message transmitted by the UE 100 may include the FPort value_B as an identifier different from the uplink message (FPort value_A) that periodically transmits the report data.

When the uplink message is received from the terminal 100, the network device 200 transmits a different value defined in the specific uplink message (hereinafter referred to as the FPort value < RTI ID = 0.0 > B) is identified, it can be classified into a specific uplink message for managing the base station list (S80).

The network device 200 updates the base station list of the terminal 100 managed by the terminal 100 based on the base station list or the specific base station information confirmed from the specific uplink message (S60, base station list L -> L ").

When the downlink message to be transmitted to the terminal 100 is generated (S70), the network device 200 selects the downlink base station selected on the base station list L "of the terminal 100, 1 (S80, S82, S84, S86).

Hereinafter, a method of operating a terminal according to a preferred embodiment of the present invention will be described with reference to FIG.

Since the terminal device 100 according to the present invention is the IoT terminal in the Internet of Things (IoT) network, it generates report data for each defined period and periodically transmits (transmits) the uplink message including the report data at step S100.

At this time, a predefined standard value (hereinafter FPort value_A) is included in the header of the uplink message transmitted by the terminal device 100, that is, the IoT terminal, more specifically, the Frame Port field in the header.

On the other hand, according to the present invention, the terminal device 100 manages a base station list indicating at least one base station that can communicate with, based on signals received from peripheral base stations.

Hereinafter, for convenience of explanation, it is assumed that the terminal device 100 is located between the base stations 5, 6, and 10 as shown in FIG.

1, the terminal device 100 determines whether beacon signals transmitted from the respective base stations are transmitted to the neighboring base stations, i.e., the base stations 5, 6, and 10 located in the periphery of the terminal device 100, (S110 Yes).

Accordingly, based on the beacon signals received from the peripheral base stations 5, 6, and 10, the terminal apparatus 100 transmits a list of base stations (e.g., base station list L indicating base stations 5, 6, and 10) (S120).

When the base station list is changed according to the base station list management, the terminal device 100 checks whether the changed base station list is changed more than a predetermined specific change ratio (for example, X%) with respect to the latest base station list (S130).

Hereinafter, for convenience of explanation, it is assumed that the base station list L is the list of base stations that the terminal device 100 most recently reported.

1, it is assumed that the terminal apparatus 100 moves and receives a beacon signal of the base station 3 after the movement in a state of receiving only the beacon signal transmitted by the base stations 5, 6, and 10 before the movement (S110 Yes).

In this case, the terminal device 100 will add and change the base station 3 to the managed base station list (e.g., the base station list L indicating the base stations 5, 6, and 10) Base station list L ') (S120).

At this time, the terminal apparatus 100 confirms whether or not the changed base station list L 'is changed more than a specific change rate (for example, X%) with respect to the base station list L most recently reported (S130) If it is less than a certain change rate (for example, X%), it is judged that it is not reported (No in S130).

While the operation is not turned off (S150 No), the terminal device 100 repeats the periodic transmission of the report data in step S100 and the steps after step S110.

1, the beacon signal of the base station 10 is not received any more when the terminal device 100 continues to move and the beacon signal transmitted by the base stations 5, 6, 10, and 3 is received It is assumed that the beacon signal of the base station 1 is further received (S110 Yes).

In this case, the terminal apparatus 100 deletes the base station 10 and adds the base station 1 to the managed base station list (e.g., the base station list L 'indicating the base stations 5, 6, 10 and 3) , Base station list L "(S120) indicating 6,3,1.

At this time, the terminal device 100 confirms whether or not the currently changed base station list L "is changed more than the specific change rate (e.g., X%) with respect to the latest list of base stations L (S130) It can be determined that the report is reported if it is not less than a specific change rate (e.g., X%) (Yes in S130).

When it is determined that the terminal device 100 reports, the terminal device 100 transmits information on the changed base station list or the specific base station involved in the change of the base station list to the network device 200 (S140).

More specifically, for example, the terminal device 100 transmits (transmits) a specific uplink message including the changed base station list L "itself and transmits the specific uplink message to the network device 200, "To the network device 200. [

As another example, the terminal apparatus 100 may transmit information (for example, base station ID, addition or deletion) of base stations added or deleted in the specific base station involved in the change of the base station list L And transmits the specific uplink message to the network device 200. In this way, the list of the changed base stations can be reported to the network device 200. [

At this time, in the header of the specific uplink message transmitted by the terminal apparatus 100, more specifically, in the Header Frame Port field, unlike the standard value (FPort value_A, hereinafter) FPort value _B may be included.

While the operation is not turned off (S150 No), the terminal device 100 repeats the periodic transmission of the report data in step S100 and the steps after step S110.

Hereinafter, a method of operating a network device according to a preferred embodiment of the present invention will be described with reference to FIG.

In operation method of the network device 200 according to the present invention, the network device 200 distinguishes which uplink message the uplink message is for when receiving the uplink message from the terminal (S200) (S210) .

Hereinafter, for convenience of explanation, the terminal 100 shown in FIG. 1 will be described as a terminal.

Specifically, when an uplink message is received from the terminal 100, the network device 200 transmits a standard value (hereinafter, referred to as FPort value _A ) Is confirmed, it can be classified into an uplink message for transmission of report data (S210A).

In this case, for the uplink message for reporting data transmission, the network device 200 will perform the process of data processing for the Internet of Things (IoT) service using the reporting data identified in the uplink message ( S215).

When the uplink message is received from the terminal 100, the network device 200 transmits a different value defined in the specific uplink message (hereinafter, referred to as " FPort value_B) is identified, a specific uplink message for BS list management (S210B).

The network device 200 updates the base station list of the terminal 100 managed by the terminal 100 on the basis of the base station list or the specific base station information identified from the specific uplink message for the identified specific uplink message (S220).

Hereinafter, for convenience of explanation, it is assumed that the current base station list of the terminal 100 managed by the network device 100 is the base station list L indicating the base stations 5, 6, and 10.

Specifically, if the specific uplink message including the base station list L "itself is transmitted from the terminal 100, the network device 200 transmits the base station list L" And updates the base station list of the base station 100.

In this case, the network device 200 can update the base station list L managed by the terminal 100 to the base station list L ".

Meanwhile, the network device 200 can update the base station list of the terminal 100 by adding or deleting the specific base station based on the information of the specific base station confirmed from the specific uplink message.

For example, the network device 200 receives from the terminal 100 information on a specific base station, for example, information (e.g., base station ID, additional) of the base station 3,1 and information (e.g., base station ID, If the uplink message has been transmitted, it is possible to transmit the uplink message to the terminal 100 based on information (e.g., base station ID, addition) of the base station 3,1 from the specific uplink message and information (e.g. base station ID, 1 " from the base station list L managed by the terminal 100 and deletes the base station 10, thereby updating the base station list L of the terminal 100 to the base station list L ".

The network device 200 transmits the downlink message to the downlink base station based on the base station list of the terminal 100 (S230).

For example, assuming that the base station list L "(base stations 5, 6, 3, 1) is the updated latest station list of the terminal 100, the network device 200 transmits a downlink message for transmission to the terminal 100 To the selected base station 5, 6, 3, 1 based on the base station list L ".

If the response (uplink message) from the terminal 100 is not returned within a predetermined time, the network device 200 can determine (confirm) that the transmission of the downlink message previously transmitted to the downlink base station has failed (S250 Yes).

If the downlink message of the terminal 100 transmitted to the downlink base station, that is, the base station 5, 6, 3, 1, is confirmed to be failed to transmit (Yes in S250) The neighbor base station of the downlink base station located within a certain range can be identified based on the position of the neighbor base station.

Then, the network device 200 transmits the downlink message of the terminal 100 to the neighbor base stations of the downlink base stations 5, 6, 3 and 1, The terminal 100 may attempt to retransmit the downlink message (S260).

That is, when the transmission of the downlink message based on the base station list L "of the terminal 100 of the terminal 100 is failed, the network device 200 transmits the downlink message transmission It is desirable to retry transmission of the downlink message to the terminal 100 in a range wider than the range of the downlink message.

If the downlink message of the retransmitted terminal 100 is confirmed to be successful (Yes in S270), the network device 200 determines that the transmission success of the neighbor base stations of the downlink base stations 5, 6, 3, The base station list of the terminal 100 can be updated by adding a specific peripheral base station to be confirmed (S280).

As described above, according to the present invention, considering the mobility of the IoT terminal, if the downlink message free type IoT terminal moves without message transmission / reception, the downlink message transmitted by the network device is successfully transmitted to the IoT terminal By realizing the improved downlink message transmission scheme that can be received, the transmission success rate of the downlink message can be increased, and the effect of improving the quality of the Internet (IoT) service can be obtained.

A method of operating a terminal device and a network device according to an embodiment of the present invention may be implemented in the form of a program command that can be executed through various computer means and recorded in a computer readable medium. The computer-readable medium may include program instructions, data files, data structures, and the like, alone or in combination. The program instructions recorded on the medium may be those specially designed and constructed for the present invention or may be available to those skilled in the art of computer software. Examples of computer-readable media include magnetic media such as hard disks, floppy disks and magnetic tape; optical media such as CD-ROMs and DVDs; magnetic media such as floppy disks; Magneto-optical media, and hardware devices 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 those 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 devices described above may be configured to operate as one or more software modules to perform the operations of the present invention, and vice versa.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

According to the terminal device, the network device, and the operation method of the device of the present invention, since the transmission success rate of the downlink message can be increased even when the IoT terminal is moved, the use of the related technology It is not only the possibility of commercialization or operation of the applicable device but also the possibility of being practically and practically possible, and thus it is an invention that is industrially applicable.

100: terminal device
110: List management unit 120:
130:
200: Network device
210: Identification section 220:
230:

Claims (14)

In the terminal device,
A list management unit for managing a base station list indicating at least one base station that can communicate with, based on signals received from peripheral base stations;
A determination unit for comparing the most recently reported base station list and the changed base station list when the base station list is changed; And
If it is determined to report the result of the determination, the network device transmits the changed base station list or the information of the specific base station involved in the change of the base station list to the network device, And a transmission unit that allows the terminal apparatus to manage the terminal apparatus. The method according to claim 1,
Wherein the transmission unit comprises:
An identifier different from an uplink message in which the terminal periodically transmits report data is inserted into the changed base station list or a specific uplink message transmitting information of the specific base station,
And the network device enables the specific uplink message to be distinguished. The method according to claim 1,
Wherein,
And determines to report the changed base station list or information of the specific base station when the changed base station list is changed by more than a predetermined specific change ratio with respect to the most recently reported base station list. A classifying unit for classifying a specific uplink message for managing a BS list in an uplink message received from a UE;
An update unit for updating the base station list of the terminal managed by the terminal based on the base station list or the information of the base station identified from the specific uplink message; And
And a controller for transmitting a downlink message for transmission to the terminal to a downlink base station selected based on a base station list of the terminal. 5. The method of claim 4,
Wherein,
Updates the base station list of the terminal to a base station list identified from the specific uplink message, or
And updates the base station list of the terminal by adding or deleting the specific base station based on the information of the specific base station identified from the specific uplink message. 5. The method of claim 4,
Wherein,
And selects all the base stations included in the base station list of the mobile station as a downlink base station for the mobile station. 5. The method of claim 4,
Wherein,
If the downlink message of the terminal transmitted to the downlink base station is confirmed as a transmission failure,
And attempts to retransmit the downlink message of the terminal through a neighbor base station of the downlink base station located within a certain range based on the position of the downlink base station. 8. The method of claim 7,
Wherein,
And updates a list of base stations of the terminal by adding a specific peripheral base station to which success of transmission of the neighbor base stations of the downlink base station is confirmed if the downlink message of the terminal retransmitted is confirmed as a successful transmission. A method of operating a terminal device,
A list management step of managing a base station list indicating at least one base station that can communicate with, based on signals received from peripheral base stations;
Comparing the most recently reported base station list and the changed base station list when the list of base stations is changed; And
If it is determined to report the result of the determination, the network device transmits the changed base station list or the information of the specific base station involved in the change of the base station list to the network device so that the network device notifies the terminal device of a list of base stations And a transmission step of allowing the terminal device to manage the terminal device. 10. The method of claim 9,
Wherein,
And determines to report the changed base station list or information of the specific base station when the changed base station list is changed by a predetermined change ratio or more compared to the most recently reported base station list. A classifying step of classifying a specific uplink message for managing a BS list in an uplink message received from a UE;
An update step of updating a base station list of the terminal managed by the terminal based on the base station list or information of the base station identified from the specific uplink message; And
And a downlink transmission step of transmitting a downlink message for transmission to the mobile station to a downlink base station selected based on the base station list of the mobile station. 12. The method of claim 11,
Wherein the updating step comprises:
Updates the base station list of the terminal to a base station list identified from the specific uplink message, or
And updating the base station list of the terminal by adding or deleting the specific base station based on information of the specific base station identified from the specific uplink message. 12. The method of claim 11,
The downlink transmission step includes:
Wherein all the base stations included in the base station list of the mobile station are selected as the downlink base stations for the mobile station. 12. The method of claim 11,
If the downlink message of the terminal transmitted to the downlink base station is confirmed to be a transmission failure, the downlink message retransmission of the terminal through the neighbor base station of the downlink base station, which is located within a certain range based on the location of the downlink base station, Lt; / RTI > And
Further comprising the step of updating a list of base stations of the terminal by adding a specific peripheral base station whose transmission success is confirmed among peripheral base stations of the downlink base station, when the downlink message of the terminal is confirmed as a successful transmission To the network device.

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