KR101521748B1 - Method and system for providing seamless transparent relay using andsf and imsi - Google Patents

Abstract

Disclosed are a method and a system for providing seamless transparent relay using ANDSF and IMSI. In a communication method of mm-wave cellular network, a communication method includes a step of allowing a terminal device to select a relay node in a coverage hole; and a step of allowing the relay node to relay communication required for the terminal by using international mobile subscriber identity (IMSI) of the terminal device.

Description

TECHNICAL FIELD [0001] The present invention relates to a continuous transparent relay method and system using ANDSF and IMSI,

Embodiments of the present invention are directed to methods and systems that can provide continuous communication 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 using millimeter waves (MM-waves) is one of the candidate technologies for 5G (fifth generation mobile communication) to achieve more than 1000 times the current data rate using very high frequency .

In a millimeter wave cellular network, transmission is performed through beamforming in a very high frequency band of 20 GHz or more. Millimeter waves are expected to generate more shadows than existing cellular networks because of their strong linearity.

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

In a millimeter-wave cellular network environment, a communication method and a communication system are provided that allow a user in a shadow area to relay to another user connected to the base station to solve a shadow area.

The present invention provides a communication method and a communication system for solving a communication shadow area problem using ANDSF (International Network Discovery and Selection Function) and IMSI (international mobile subscriber identity).

A method of communication in a millimeter wave cellular network, the method comprising: selecting a relay node in a coverage hole; And relaying, by the relay node, a communication requested by the terminal apparatus using an international mobile subscriber identity (IMSI) of the terminal apparatus.

According to an aspect of the present invention, the selecting includes: requesting a candidate terminal list that can be relayed to an access network discovery and selection function (ANDSF) server when the terminal device identifies a shadow area in a moving direction; And selecting the terminal included in the candidate terminal list as the relay node when the terminal device receives the candidate terminal list from the ANDSF.

According to another aspect of the present invention, the selecting includes: searching for a candidate relay terminal list using a beacon message if a shadow area is identified in the moving direction; And the terminal device selecting one of the terminals included in the candidate terminal list as the relay node.

According to another aspect of the present invention, the relaying step comprises: the terminal device transmitting its IMSI to the relay node after connecting to the relay node; The relay node creating a relay table by mapping an IMSI of the terminal device and a network protocol; If the relay node requests communication between the terminal apparatus and the base station, connecting to the base station using the IMSI of the terminal apparatus; And relaying, by the relay node, a packet destined for the terminal device from the relay table to the terminal device through a network protocol corresponding to the IMSI of the terminal device.

A communication system using a millimeter wave cellular network includes an access network discovery and selection function (ANDSF) server for providing a list of candidate terminals that can be relayed to a terminal device close to a coverage hole, , The terminal selects one of the terminals included in the candidate terminal list as a relay node in the shadow area, and the relay node uses an international mobile subscriber identity (IMSI) of the terminal device And the communication requested by the terminal device is relayed.

According to an aspect of the present invention, when the terminal device enters the shadow area before receiving the candidate terminal list from the ANDSF server, the terminal device can directly search for a relay candidate terminal using a beacon message.

According to another aspect, the terminal device transmits its IMSI to the relay node after connecting with the relay node, and the relay node creates a relay table by mapping the IMSI of the terminal device and a network protocol, If communication between the device and the base station is required, the terminal connects to the base station using the IMSI of the terminal device, and then transmits a packet destined for the terminal device to the terminal device through the network protocol corresponding to the IMSI of the terminal device in the relay table Relay can be done.

According to the embodiment of the present invention, it is possible to select a node capable of relaying data to a user in a shadow area by using the ANDSF, and to make a connection with the relay node and continuous communication through a transparent relay using IMSI information Can be guaranteed.

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 a flowchart illustrating a general authentication process between a terminal and a base station.
3 is a flowchart illustrating a process of connecting to a relay node in a shadow area according to an exemplary embodiment of the present invention.
4 is a flowchart illustrating a communication relay process through a connection between a terminal and a relay node according to an exemplary embodiment of the present invention.
FIG. 5 is a diagram for explaining a feature of a communication method using an ANDSF and an IMSI according to 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, ANDSF and international mobile subscriber identity (IMSI) information can be used to ensure continuous communication.

In the present embodiment, the ANDSF has a form of providing information on a relay node in an existing function that provides only information on an access network.

In general, ANDSF is an entity that coexists with the Evolved Packet Core (EPC) of the 3GPP network. The ANDSF is a non-3GPP network such as Wi-Fi and WIMAX that can be used for data communication in addition to the 3GPP network. The goal is to help you discover.

The ANDSF in the present invention can provide the following three pieces of information to the UE.

(1) Inter-System Mobility Policy (ISMP); When a terminal (UE) can be connected to only one network, a rule necessary for selecting a network

(2) Inter-System Routing Policy (ISRP); The rules when the UE can be connected to multiple networks at the same time

(3) Discovery Information; A list of available networks in the vicinity of the UE and information for facilitating quick access to the network

The International Mobile Subscriber Identity (IMSI) information is a unique ID recorded in a SIM (Subscriber Identification Module) card of the UE, and is used as identification information for accessing a mobile network and receiving authentication do.

Furthermore, multiple IMSI (Multi-IMSI) technology provides more than one IMSI to a single SIM card. This can be achieved by assigning a mobile number to each IMSI so that only one UE can use a number used for business purposes and a number used for personal / private use. In addition, multiple IMSI technology is a convenient technology for receiving roaming in outbound coverage in countries and regions that adopt other standard technologies in mobile networks.

3 is a flowchart illustrating a process of connecting to a relay node in a shadow area according to an exemplary embodiment of the present invention.

In step S31, the terminal 301 can report its current location and receive information about the beam from the cellular network. At this time, the terminal 301 can confirm whether there is no usable beam or a shadow area in the traveling direction according to the movement. For example, the terminal 301 can search for a shadow area through 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) Accordingly, by adding the shaded area search function to the GPS, the GPS 201 can inform the terminal 301 of the proximity of the shaded area when the terminal 301 is close to the shaded area. Accordingly, when the terminal 301 is close to the shadow area, the terminal 301 can receive an alarm indicating that the shadow area is closer to the shadow area.

In step S32, the terminal 301 transmits an ANN (Access Network Information Request) message to the ANDSF server 302 when the vicinity of the shaded area is expected, and notifies the ANDSF server 302 of the candidate terminal list . Accordingly, the ANDSF server 302 can provide a list of candidate terminals capable of acting as a relay node to the terminal 301 based on information exchange with an MME (Mobility Management Entity) and an HSS (Home Subscriber Server). At this time, after receiving the candidate terminal list from the ANDSF server 302, the terminal 301 selects the most appropriate candidate terminal as the relay node, and completes the connection with the corresponding relay node before leaving the shadow area, Lt; / RTI > In other words, the terminal 301 can establish a seamless relay connection by configuring the relay with the relay node before the connection with the base station is disconnected through the ANDSF server 302.

In the case of the terminal 301 moving at a high speed, the terminal 301 may be moved to the shadow area before discovery of the shadow area or before receiving the requested information from the ANDSF server 302. In this case, the terminal 301 can directly search relay candidate candidates through a beacon message.

4 is a flowchart illustrating a communication relay process through a connection between a terminal and a relay node according to an exemplary embodiment of the present invention.

In step S41, the terminal 401 establishes a connection with the relay node 403 via the wireless LAN network (e.g., WiFi, WiMAX, etc.) international mobile subscriber identity) information. Accordingly, the relay node 403 can create a relay table (Table 1) that maps the IMSI of the terminal 401 missing in the shadow area to the IP of the relay network. If there are a plurality of terminals attempting relay connection, the IMSI of the terminal and the IP of the relay network can be mapped for each terminal as shown in Table 1.

Relay Table IMSI Relay_IP UE1's IMSI UE1's IP UE2's IMSI UE2's IP UE3's IMSI UE3's IP

In step S42, the relay node 403 can authenticate to the BS, the core network (MME, HSS, SPR, etc.) using the IMSI of the MS 401 and report its location. At this time, the relay node 403 establishes a connection to the network with the IMSI of the terminal 401 in response to the communication requested by the terminal 401, and the communication required by the relay node 403 uses the IMSI of the relay node 403 Configure the connection. Since the IMSI used for each connection is different from the communication requested by the terminal 401 in the relay node 403 and the communication requested by the terminal 401, a separate connection can be formed, and a packet to be received by the relay node 403, The packet to be relayed to the base station 401 can be automatically separated.

In step S43, the relay node 403 can relay packets destined for the terminal 401 to the terminal 401 through a wireless LAN network (e.g., WiFi, WiMAX, etc.) using the relay table. In other words, the relay node 403 can relay the packet with the terminal 401 as a destination to the terminal 401 through the IP corresponding to the IMSI of the terminal 401.

Therefore, in this embodiment, the problem of the shadow area in the communication environment using the millimeter wave can be solved through the relay node search technique using the ANDSF and the transparent relay technique using the IMSI.

Transparent relay using the IMSI according to the present invention does not require additional functions other than the normal role of the base station and the network. 5, the terminal UE maintains communication with the base station (BS) through a connection with the relay node (RN) in the shadow area, but the relay node (RN) uses the IMSI of the terminal It is observed that the terminal UE and the relay node RN are located at the same position from the viewpoint of the base station (BS).

At this time, since the communication requested by the terminal UE and the communication requested by the relay node RN are communicated through the respective IMSIs, a packet to be sent to the relay node RN and a packet to be sent to the terminal UE A packet to be relayed via the node (RN)) does not need any additional action. However, in the relay node RN, there may occur a case where a new packet is configured for relay to the UE according to a communication technique used for relaying with the UE.

In addition, since the IMSI used for the communication requested by the terminal UE is different from the IMSI used for the communication requested by the relay node RN, even if the relay node RN participates in the communication required by the terminal UE, As a user, a charge can be imposed on the person registered with the network operator. In other words, since the communication charge using the relay network is automatically divided into the users of the UE and the users of the relay node RN according to the IMSI used in the communication, the communication using the IMSIM of the UE Quot;) < / RTI >

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 that can relay data to a user in a shadow area by using the ANDSF, and to securely connect to the relay node through a transparent relay using IMSI information, Thereby ensuring continuous communication.

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: terminal
302: ANDSF server
403: Relay node

Claims (7)

A communication method in a millimeter wave cellular network,
The terminal device selecting a relay node in a coverage hole; And
Wherein the relay node relays communication requested by the terminal apparatus using an international mobile subscriber identity (IMSI) of the terminal apparatus
Lt; / RTI >
Wherein the relaying step comprises:
Transmitting, by the terminal device, its IMSI to the relay node after connecting with the relay node;
The relay node creating a relay table by mapping an IMSI of the terminal device and a network protocol;
If the relay node requests communication between the terminal apparatus and the base station, connecting to the base station using the IMSI of the terminal apparatus; And
Relaying, by the relay node, a packet destined for the terminal device from the relay table to the terminal device through a network protocol corresponding to the IMSI of the terminal device
/ RTI > The method according to claim 1,
Wherein the selecting comprises:
Requesting a candidate terminal list which can be relayed to an access network discovery and selection function (ANDSF) server when the terminal device identifies a shadow area in a moving direction; And
When the terminal device receives the candidate terminal list from the ANDSF, selects one of the terminals included in the candidate terminal list as the relay node
/ RTI > The method according to claim 1,
Wherein the selecting comprises:
If the terminal device identifies a shadow area in the moving direction, searching for a candidate relay terminal list using a beacon message; And
Wherein the terminal device selects one of the terminals included in the candidate terminal list as the relay node
/ RTI > delete delete delete delete

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