KR101537893B1 - Method and system for providing seamless communication using andsf function and hss-mme mapping table - Google Patents

Abstract

Disclosed are a method and system for providing a seamless communication service in a coverage hole thorugh a modified ANDSF function and a HSS-MME mapping table. In a communication method implemented by a computer, provided is the communication method which includes the steps of enabling an access network discovery and selection function (ANDSF) server to search a relay node to be connected to a terminal device; and enabling the terminal device to transmit and receive data through the relay node by connecting to the relay node in the coverage hole.

Description

TECHNICAL FIELD [0001] The present invention relates to a method and system for continuously providing services in a shadow area through a modified ANDSF function and an HSS-MME mapping table,

Embodiments of the present invention are directed to methods and systems that can provide continuous services to terminals in shadow areas.

In general, location based services using global positioning system (GPS) signals provide accurate service by providing accurate location measurements in the area where GPS signals are received.

These GPS systems began to be developed by the US Department of Defense in the early 1970s and began operations in earnest in the mid-1990s. The GPS system is the most ideal navigation system that can be used all over the world regardless of time or weather conditions. It was originally designed for military purposes, but due to its economic and usefulness it has rapidly expanded to civilian use and has become the most common navigation system to date. have.

For example, various kinds of moving objects such as a ship, an airplane, and an automobile are equipped with a GPS measuring device for confirming the current position and the moving speed or determining a moving route. The GPS positioning apparatus calculates the current position of the moving object by receiving radio waves indicating latitude, longitude, altitude, etc. from four or more artificial satellites located in six orbits.

However, since such a GPS measuring device can perform position measurement only in a region capable of receiving a signal from a satellite, in the case of entering a indoor or outdoor shaded area where no GPS signal is received, such as a building or a tunnel, impossible.

Therefore, there is a problem that the method of receiving the GPS signal and outputting the current position on the built-in electronic map is not available in the shadow area where the GPS signal is not received.

In order to solve the above problem, researches on a technique of estimating the position of a subscriber in a shaded area where GPS signals are not received are actively studied.

For example, in Korean Patent Laid-Open No. 10-2011-0005394 (Jan. 18, 2011), the global coordinates (Global Coordinate) in which GPS signals are received and the shaded area local coordinates Local Coordinate) is used to convert the local coordinates inside the building into global coordinates, so that the location can be grasped by the global coordinates even in the shaded area.

Communication over millimeter-wave (mm-wave) is one of the candidate technologies for fifth generation mobile communication (5G) to achieve more than 1000 times the current data rate using very high frequency .

However, since millimeter wave communication uses a very high frequency of 20 GHz or more, a communication hole is likely to occur due to the linearity.

Therefore, there is a need to provide continuous services to terminals that are not in the shadow area.

A communication method and a communication system for solving a communication shadow area problem using a modified ANDSF (Access Network Discovery and Selection Function) and an HSS (Home Subscriber Server) -MME (Mobility Management Entity) authentication mapping table.

A communication method implemented by a computer, the method comprising: searching for a relay node connectable to a terminal device by an access network discovery and selection function (ANDSF) server; And the terminal device communicating with the relay node in a coverage hole to transmit and receive data through the relay node.

According to an aspect of the present invention, before the searching step, the terminal device receives an alarm notifying from the GPS that it is close to the shadow area; And transmitting, by the terminal device, an access request message including a location information of the terminal device to the ANDSF server, wherein, when the access request message is received from the terminal device, The relay node can be searched using the information.

According to another aspect of the present invention, the searching step may include the step of, using the current location of the terminal device, exchanging information with the MME (Mobility Management Entity) and the HSS (Home Subscriber Server) Device.

According to another aspect of the present invention, in the transmitting and receiving step, the terminal device selects one of the nodes included in the candidate node list as the relay node and transmits its identification information to the relay node; The relay node transmitting an access request message including identification information of the terminal device to the MME; Transmitting, by the MME, the authentication information mapped to the identification information of the terminal apparatus in the HSS to the relay node; And a step in which the relay node performs authentication for connection with the terminal apparatus using the authentication information.

According to another aspect of the present invention, the HSS includes a table in which the identification information of the terminal is mapped to a first authentication key for connection with a base station and a second authentication key for connection with a relay node, The terminal device selecting one of the nodes included in the candidate node list as the relay node and transmitting its identification information to the relay node; The relay node transmitting an access request message including identification information of the terminal device to the MME; Transmitting, by the MME, the first authentication key and the second authentication key mapped to the identification information of the terminal device through the table to the relay node; Transmitting, by the relay node, the first authentication key and the second authentication key to the terminal device; The relay node performing authentication for connection with the terminal device using the second authentication key; And the terminal device performing authentication for connection with the base station and connection with the relay node using the first authentication key and the second authentication key.

An access network discovery and selection function (ANDSF) server including a function of searching for a relay node connectable to a terminal apparatus; And a terminal device connected to the relay node discovered through the ANDSF server in a coverage hole and transmitting and receiving data through the relay node.

An access network discovery and selection function (ANDSF) server for requesting a search for a relay node connectable to a terminal close to a coverage hole; And a Mobility Management Entity (MME) for providing a candidate node list connectable to the terminal device using a current location of the terminal device in response to a request from the ANDSF server, wherein the terminal device comprises: Selects one of the nodes as the relay node, and connects to the relay node to transmit / receive data through the relay node.

According to an aspect of the present invention, the terminal device can transmit an access request message including its own location information to the ANDSF server when an alarm indicating that the terminal is close to the shaded area is received from the GPS.

According to another aspect of the present invention, there is provided a method for providing a service to a mobile node, the method comprising the steps of: (a) providing a QoS profile information of each node included in the candidate node list, To the terminal device.

According to another aspect of the present invention, there is provided an HSS (Home Subscriber Server) including a table in which a first authentication key for connection with a base station and a second authentication key for connection with a relay node are mapped to identification information of the terminal device Wherein the MME transmits the first authentication key and the second authentication key mapped to the identification information of the terminal device to the relay node and the terminal device through the table, The terminal device performs authentication for connection with the terminal device using a key, and the terminal device performs authentication for connection with the base station and connection with the relay node using the first authentication key and the second authentication key, Can be performed.

According to the embodiment of the present invention, it is possible to select a node capable of relaying data in the shadow area using the modified ANDSF-HSS-MME authentication mapping table, and to ensure continuous communication through a secure connection with the selected relay node can do.

1 illustrates, by way of example, a system environment for resolving communication shadow areas, in accordance with an embodiment of the present invention.
2 is an exemplary diagram for explaining a process of selecting a relay node through a modified ANDSF in an embodiment of the present invention.
3 is a flowchart illustrating a process of selecting a relay node for solving a shadow area problem according to an exemplary embodiment of the present invention.
4 is an exemplary diagram for explaining authentication information mapping between an HSS and an MME for connection between a terminal and a relay node in an embodiment of the present invention.
5 is a flowchart illustrating an authentication procedure for connection between a terminal and a relay node in an embodiment of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

In this embodiment, a method of providing continuous services to terminals missing in a shadow area in a communication environment using millimeter waves is proposed.

1 illustrates, by way of example, a system environment for resolving communication shadow areas, in accordance with an embodiment of the present invention.

Referring to FIG. 1, in a wireless network environment, a UE must be able to guarantee continuous communication through an Access Network Discovery and Selection Function (ANDSF) before it falls into a shadow area.

In the present invention, a mapping table of a modified ANDSF and a Home Subscriber Server (HSS) -MME (Mobility Management Entity) is used to ensure continuous communication.

At this time, the modified ANDSF has a form of providing information on a relay node from an existing function that provides only information on an access network.

The mapping table of the HSS-MME maps the authentication information in the cellular network (BS) and the authentication information in the wireless LAN (WiFi) to the UE in the HSS and the MME, The connection of the terminal can be facilitated.

2 is an exemplary diagram for explaining a process of selecting a relay node through a modified ANDSF in an embodiment of the present invention.

Existing ANDSF stores information about accessible 3GPP and non-3GPP access networks (e.g., WiFi) in the ANDSF server.

In a scenario where millimeter waves are used, a UE (UE) in a shadow area must receive data from another relay node. Therefore, the ANDSF should also be able to provide information on the relay node.

Therefore, in the present invention, a function of searching for a relay node in the existing ANDSF can be added, so that a terminal missing in a shadow area can be serviced so as to guarantee continuous communication.

Referring to FIG. 2, in the present invention, a shadow region can be searched through a Global Positioning System (GPS) Since the shaded area causes a sharp deterioration of SNR (signal-to-noise ratio) due to its characteristics, it is not appropriate to change the access network by periodically measuring the SNR in a multi-mode (multi-RAT) Therefore, by adding the shadow area search function to the GPS 201, the GPS 201 can inform the terminal 202 of the proximity of the shadow area when the terminal 202 is close to the shadow area.

When the terminal 202 recognizes that it is close to the shadow area through the GPS 201, the terminal 202 broadcasts an access network information request (ANIR) message to the neighbor base station (BS) 203 to search for a relay node to be relayed in the shadow area (broadcasting). At this time, the ANIR message may include information on the terminal location, terminal capabilities, and the like.

The base station 203 delivers the ANIR message received from the terminal 202 to an ANDSF server (not shown) behind the Evolved Packet Core (EPC). The ANDSF server includes a list (i.e., a relay node list) including candidate terminals (Relay UE Candidates 1, 2 and 3) capable of serving as a relay node to the terminal 202 based on information exchange with the MME and the HSS, To the terminal (202).

After receiving the relay node list through a reply message to the ANIR message, the terminal 202 selects the most appropriate relay node 204 among the relay nodes 204 and transmits the connection to the relay node 204 before leaving the shadow area The continuity of communication can be maintained.

3 is a flowchart illustrating a process of selecting a relay node for solving a shadow area problem according to an exemplary embodiment of the present invention.

In step S0, when the terminal 301 is close to the shadow area, the terminal 301 receives an alarm indicating that the shadow area is close to the shadow area.

In step S1, the UE 301 transmits a message including an international mobile subscriber identity (IMSI), a tracking area identity (TAI), an access network information request (ANIR), and the like to the ANDSF server 302, Location, and capabilities of the system.

The ANDSF server 302 may request the MME 303 from the candidate list of the relay node (RN) to which the terminal 301 can connect based on the current position of the terminal 301 in step S2.

In step S3, the MME 303 records and tracks in which area the UE 301 is located based on the TAI value or the like. Therefore, the MME 303 can know the relay node candidates for the UE 301, And requests the relevant QoS (Quality of Service) profile while passing the node's IMSI information to the HSS 304. [

In step S4, the HSS 304 transmits to the MME 303 the information requested by the MME 303, that is, the relevant QoS profile of the relay node (RN) corresponding to the candidate list.

In step S5, the MME 303 transfers the information received from the HSS 304 to the ANDSF server 302. [

In step S6, the ANDSF server 302 transmits the candidate list of the relay node to which the terminal 301 is connectable and the policy related information to the terminal 301 based on the response information from the MME 303 .

In step S7, the terminal 301 selects the relay node 305 to be accessed based on the information received from the ANDSF server 302, its configuration information, and the like.

Since the relay node has mobility different from that of a fixed access point (AP) or a base station (BS), the relay node may not have all the related information in the ANDSF server 302, It is more efficient to obtain information through the processes (S2 to S5).

4 is an exemplary diagram for explaining authentication information mapping between an HSS and an MME for connection between a terminal and a relay node in an embodiment of the present invention.

The terminal 401 can select the most suitable relay node 405 after receiving the candidate list of the relay node from the ANDSF server 402 through the above process.

The terminal 401 sends its IMSI information to the MME 403 of the base station BS in the corresponding location and then transmits the IMSI information to the terminal 401 through the relay node 405 through the interaction between the MME 403 and the HSS 404 And the authentication step between the terminal 401 and the base station (BS) is completed.

The HSS 404 has a table in which values for authentication of the connection between the terminal 401 and the relay node 405 and the connection between the terminal 401 and the base station are mapped to the IMSI information of the terminal, It is possible to achieve authentication between the two connections by transmitting the corresponding information.

The mapping table of the HSS 404 is shown in Table 1 below.

[Table 1]

The mapping table of the HSS 404 includes a security key for terminal authentication, an authentication value (AV) for connection between the terminal 401 and the base stations (BS), a connection between the terminal 401 and the relay nodes 405 (MSK) for the MS may be mapped to the IMSI information of the MS.

The HSS 404 authenticates the terminal 401 through the IMSI information and the secret key and then transmits the AV that is the AKA authentication value for the connection between the terminal 401 and the base stations (BS) (MSK) for connection between the master key (405).

5 is a flowchart illustrating an authentication procedure for connection between a terminal and a relay node in an embodiment of the present invention.

In step S1, the terminal 501 selects a node 505 to be relayed in the shadow area of the candidate list of the relay node, and then transmits its IMSI value to the selected relay node 505.

The relay node 505 transmits an access request message including the IMSI value received from the terminal 501 to the MME 503 for authentication with the terminal 501 in step S2.

In step S3, the MME 503 can perform authentication by referring to the IMSI value transmitted together with the access request message through the mapping table prepared in advance in the HSS 504 in cooperation with the HSS 504. [

In step S4, the MME 503 communicates with the HSS 504 for authentication between the terminal 501 and the base station (BS) for connection between the terminal 501 and the relay node 505 MSK to the relay node 505, and the relay node 505 delivers the information received from the MME 503 to the terminal 501. At this time, the relay node 505 uses the MSK information for connection with the terminal 501, and the terminal 501 transmits AV and MSK information for connection with the BS and connection with the relay node 505 Use it all.

In step S5, the terminal 501 may complete the authentication for the continuous communication environment in the shadow area and relay the data through the relay node 505 in the shadow area.

Here, the terminal 501 creates an encryption key KSAME that can guarantee security between the terminal 501 and the base station (BS) using the AV. Since the relay node 505 relays data to the terminal 501 but can not confirm the data itself of the terminal 501, the relay node 505 transmits the encrypted data created through the KSAME and assures security in the wireless section through the MSK . The terminal 501 decodes the received data into original data through MSK and KSAME.

The methods according to embodiments of the present invention may be implemented in the form of a program instruction that can be executed through various computer systems and recorded in a computer-readable medium.

As described above, according to the embodiment of the present invention, it is possible to select a node capable of relaying data in the shadow area using the modified ANDSF-HSS-MME authentication mapping table, Communication can be ensured.

The apparatus described above may be implemented as a hardware component, a software component, and / or a combination of hardware components and software components. For example, the apparatus and components described in the embodiments may be implemented within a computer system, such as, for example, a processor, a controller, an arithmetic logic unit (ALU), a digital signal processor, a microcomputer, a field programmable gate array (FPGA) , A programmable logic unit (PLU), a microprocessor, or any other device capable of executing and responding to instructions. The processing device may execute an operating system (OS) and one or more software applications running on the operating system. The processing device may also access, store, manipulate, process, and generate data in response to execution of the software. For ease of understanding, the processing apparatus may be described as being used singly, but those skilled in the art will recognize that the processing apparatus may have a plurality of processing elements and / As shown in FIG. For example, the processing unit may comprise a plurality of processors or one processor and one controller. Other processing configurations are also possible, such as a parallel processor.

The software may include a computer program, code, instructions, or a combination of one or more of the foregoing, and may be configured to configure the processing device to operate as desired or to process it collectively or collectively Device can be commanded. The software and / or data may be in the form of any type of machine, component, physical device, virtual equipment, computer storage media, or device , Or may be permanently or temporarily embodied in a transmitted signal wave. The software may be distributed over a networked computer system and stored or executed in a distributed manner. The software and data may be stored on one or more computer readable recording media.

The method according to an embodiment 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 to be recorded on the medium may be those specially designed and configured for the embodiments 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 embodiments, 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. For example, it is to be understood that the techniques described may be performed in a different order than the described methods, and / or that components of the described systems, structures, devices, circuits, Lt; / RTI > or equivalents, even if it is replaced or replaced.

Therefore, other implementations, other embodiments, and equivalents to the claims are also within the scope of the following claims.

301, 401, 501: terminal
302, 402: ANDSF server
303, 403, 503: MME
304, 404, 504: HSS
305, 405, 505: relay node

Claims (10)

A computer-implemented communication method,
The terminal device receiving an alarm informing that it is close to the shadow area from the GPS;
Transmitting, by the terminal, an access request message including its own location information to an Access Network Discovery and Selection Function (ANDSF) server;
The access network discovery and selection function (ANDSF) server searching for a relay node connectable to a terminal device; And
Wherein the terminal device is connected to the relay node in a coverage hole and transmits and receives data through the relay node
Lt; / RTI >
Wherein the searching step comprises:
When the access request message is received from the terminal, searching for the relay node using the location information
. delete The method according to claim 1,
Wherein the searching step comprises:
And transmitting a candidate node list connectable with the terminal apparatus to the terminal apparatus through information exchange with an MME (Mobility Management Entity) and an HSS (Home Subscriber Server) using the current position of the terminal apparatus
. The method of claim 3,
The transmitting /
The terminal device selecting one of the nodes included in the candidate node list as the relay node and transmitting its identification information to the relay node;
The relay node transmitting an access request message including identification information of the terminal device to the MME;
Transmitting, by the MME, the authentication information mapped to the identification information of the terminal apparatus in the HSS to the relay node; And
The relay node performs authentication for connection with the terminal apparatus using the authentication information
/ RTI > The method of claim 3,
Wherein the HSS includes a table in which identification information of the terminal device is mapped to a first authentication key for connection with a base station and a second authentication key for connection with a relay node,
The transmitting /
The terminal device selecting one of the nodes included in the candidate node list as the relay node and transmitting its identification information to the relay node;
The relay node transmitting an access request message including identification information of the terminal device to the MME;
Transmitting, by the MME, the first authentication key and the second authentication key mapped to the identification information of the terminal device through the table to the relay node;
Transmitting, by the relay node, the first authentication key and the second authentication key to the terminal device;
The relay node performing authentication for connection with the terminal device using the second authentication key; And
The terminal device performing authentication for connection with the base station and connection with the relay node using the first authentication key and the second authentication key
/ RTI > An access network discovery and selection function (ANDSF) server including a function of searching for a relay node connectable to a terminal apparatus; And
A terminal device connected to the relay node discovered through the ANDSF server in a coverage hole and transmitting / receiving data through the relay node
Lt; / RTI >
The terminal apparatus comprises:
Receives an alarm from the GPS indicating that it is close to the shadow area, transmits an access request message including its own location to the ANDSF server,
The ANDSF server,
When the access request message is received from the terminal, searching for the relay node using the location information
. An access network discovery and selection function (ANDSF) server for requesting a search for a relay node connectable to a terminal close to a coverage hole; And
A Mobility Management Entity (MME) for providing a list of candidate nodes connectable to the terminal device using the current location of the terminal device in response to a request from the ANDSF server,
Lt; / RTI >
The terminal apparatus comprises:
Selecting one of the nodes included in the candidate node list as the relay node, communicating with the relay node to transmit / receive data through the relay node,
And transmitting an access request message including its own location information to the ANDSF server upon receipt of an alarm from the GPS indicating that it is close to the shadow area
. delete 8. The method of claim 7,
A home subscriber server (HSS) providing quality of service (QoS) profile information of each node included in the candidate node list;
Further comprising:
And the MME provides the QoS profile information to the terminal device together with the candidate node list
. 8. The method of claim 7,
A Home Subscriber Server (HSS) including a table in which a first authentication key for connection with the base station and a second authentication key for connection with the relay node are mapped to the identification information of the terminal device,
Further comprising:
The MME transmits the first authentication key and the second authentication key mapped to the identification information of the terminal device to the relay node and the terminal device through the table,
The relay node performs authentication for connection with the terminal device using the second authentication key,
The terminal device performs authentication for connection with the base station and connection with the relay node using the first authentication key and the second authentication key
.

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