KR20180010428A - Method detecting position of user terminal for lte network - Google Patents

Abstract

According to an embodiment of the present invention, a positioning method of an LTE network comprises: a step in which a target mobility management entity (MME) receives a position registration request of a terminal that is moved to a region of the target MME while a paging operation according to a request of a serving MME that receives a positioning request for the terminal is performed; a step in which the target MME requests terminal information of the terminal to the serving MME according to the position registration request of the terminal; a step in which the target MME receives the positioning request for the terminal generated according to a position movement message of the serving MME that receives the terminal information; and a step in which the target MME requests paging to an evolved node B (eNB) in which a position of the terminal is registered.

Description

[0001] DESCRIPTION [0002] METHOD DETECTING POSITION OF USER TERMINAL FOR LTE NETWORK [

BACKGROUND OF THE INVENTION 1. Field of the Invention [0002] The present invention relates to a location positioning method of an LTE network, and more particularly, to a location positioning method of an LTE network capable of reducing a failure probability of location positioning of a terminal.

A 3rd Generation Partnership Project (3GPP) mobile communication system based on WCDMA (Wideband Code Division Multiple Access) radio access technology is widely deployed all over the world and can be defined as the first evolution stage of WCDMA HSDPA (High Speed Downlink Packet Access) provides a wireless access technology with high competitiveness to 3GPP mobile communication system in the mid-term future.

However, as the requirements and expectations of users and operators continue to increase and competition for development of wireless access technologies continues, there is a need to evolve new technologies in 3GPP mobile communication systems in order to gain competitiveness in the future.

That is, a reduction in cost per bit, an increase in service availability, the use of a flexible frequency band, a simple structure and an open interface, and an appropriate power consumption of a user equipment are required. In addition, prevention of unnecessary latency at a network node and efficient use of network resources can also promote technology evolution in 3GPP.

In 3GPP Release 8, a network architecture EPC (Evolved Packet Core) is described as one of mobile communication systems to satisfy the above-mentioned requirements. The EPC is a collection of network nodes for the 3GPP LTE system. The EPC has evolved from the core network of the existing 3GPP system architecture and supports E-UTRAN, which is an evolved RAN, and also provides an E-UTRAN which simplifies the network node in order to increase the efficiency of the packet network. Network structure. A wireless communication system including an EPC and an Evolved-UMTS Terrestrial Radio Access Network (E-UTRAN) may be referred to as an evolved packet system (EPS), and LTE mobile communication systems currently being implemented and serviced in the Republic of Korea.

In the LTE network, radio resources of UEs are released from UE (User Equipment: terminal equipment) to eNodeB (eNB: base station) to SGW (Serving Gateway) sections when there is no transmission / This is to increase efficiency by allowing a plurality of terminals to share wireless resources in a time division manner. In this case, the terminal enters an idle state.

When the UE enters the idle state, the downlink bearer to the UE becomes inactive. Here, the bearer refers to a kind of data transmission channel.

Meanwhile, the position of the UE in the LTE network can be estimated from the position of the base station to which the UE is connected. The EPC grasps the location of the UE in units of MME (Mobility Management Entity). When a positioning request for the terminal occurs, a signal is transmitted to the base stations managed by the MME where the terminal has last registered location, and it is determined which base station is connected to the terminal. At this time, if the mobile station in the idle state moves in the MME boundary region, that is, if the mobile station moves to the MME other than the last registered MME, the positioning of the mobile station may fail.

An aspect of the present invention is to provide a location positioning method of an LTE network that can reduce a phenomenon that a positioning of a terminal fails when a location location request is generated.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory and are not intended to limit the invention to the precise forms disclosed. It will be possible.

According to an aspect of the present invention, there is provided a method for locating an LTE network according to an exemplary embodiment of the present invention, including: performing a paging operation according to a request from a serving MME (Mobility Management Entity) Receiving, by the target MME, a location registration request of the terminal that has moved to the area of the target MME; The target MME requesting the terminal information of the terminal to the serving MME according to the location registration request of the terminal; Receiving a location location request for the terminal, the location MME being generated according to the location movement message of the serving MME, the target MME having received the terminal information; And requesting the target MME to paging the Evolved Node B (eNB) in which the MS is located.

According to an embodiment, the target MME may recognize the serving MME based on the IP address of the serving MME included in the location registration request of the terminal.

According to an embodiment, after the location registration request of the terminal is delivered to the HSS (Home Subscriber Server), the target MME recognizes the serving MME based on the IP address of the serving MME included in the response from the HSS As shown in FIG.

According to an embodiment, the target MME may receive a response to the paging message transmitted by the terminal, which has received a paging message from the eNB, through the eNB; And the target MME may determine the position of the terminal based on the response and perform the positioning.

According to an embodiment, the location location can be performed using any one of a CID (Cell ID) method, an E-CID (Enhanced Cell ID) method, and an OTDOA (Observed Time Difference of Arrival) method.

A method for locating an LTE network according to another embodiment of the present invention includes: a step in which a serving MME (Mobility Management Entity) receives a location location request for a mobile station and requests paging from an eNB (Evolved Node B) ; Receiving a request for terminal information of the terminal generated in response to a location registration request of the terminal that the serving MME has moved from the target MME to the area of the target MME during a paging operation according to the request; And transmitting, by the serving MME to a GMLC (Gateway Mobile Location Center), a location movement message indicating that the terminal has moved to the target MME area upon receiving the terminal information request.

A method of positioning a location of an LTE network according to another embodiment of the present invention is characterized in that a serving MME (Mobility Management Entity) receives a location location request for an MS and requests paging to an eNB (Evolved Node B) ; Receiving, by the target MME, a location registration request of the terminal moved to the area of the target MME during a paging operation according to a request for paging; The serving MME receiving a request for terminal information of the terminal generated according to a location registration request of the terminal; Transmitting, by the serving MME, a location movement message to the gateway mobile location center (GMLC) indicating that the mobile terminal has moved to the target MME area upon receipt of the request for the terminal information; Receiving, by the target MME, a location location request for the terminal generated in accordance with the location movement message; And the target MME requesting paging to the eNB where the terminal is registered.

According to the positioning method of the LTE network according to an embodiment of the present invention as described above, even if the terminal moves on the MME boundary during the paging operation for the location location request, It is possible to reduce the possibility of positional positioning failure.

The effects obtained by the present invention are not limited to the above-mentioned effects, and other effects not mentioned can be clearly understood by those skilled in the art from the following description will be.

1 is a configuration diagram of an LTE network according to the present invention.
FIG. 2 is a view for explaining a problem occurring in positioning of a terminal.
3 is a flowchart illustrating a positioning method of an LTE network according to an embodiment of the present invention.

Hereinafter, at least one embodiment related to the present invention will be described in detail with reference to the drawings. The suffix "module" and " part "for the components used in the following description are given or mixed in consideration of ease of specification, and do not have their own meaning or role.

1 is a configuration diagram of an LTE network according to the present invention.

1, the LTE network 1 includes a UE (User Equipment) 10, an Evolved Node B (eNB) 20, an S-GW (Serving Gateway) 30, a P- A Data Network Gateway 40, an MME (Mobility Management Entity) 50, a GMLC (Gateway Mobile Location Center) 60, an HSS (Home Subscriber Server) 70, an AGENT 80 and an evolved Serving Mobile Location Center (eSMLC) As shown in FIG.

The UE 10 is an LTE user terminal and is connected to the eNB 20 via the LTE-Uu interface 15. Here, the LTE Uu interface 15 defines a control plane for transmitting and receiving a control message as a wireless interface and a user plane for providing user data.

The eNB 20 provides a radio interface to the UE 10 and provides radio resource management functions such as radio bearer control, radio admission control, dynamic radio resource allocation, load balancing and inter-cell interference control do.

The S-GW 30 is an end point of an evolved universal terrestrial radio access network (E-UTRAN) and an evolved packet core (EPC), and an anchor point at handover between the eNB 20 and the 3GPP system do. The E-UTRAN comprises at least one eNB 20 and the EPC includes an S-GW 30, a P-GW 40, an MME 50, a GMLC 60, an HSS 70 and an eSMLC 90).

The P-GW 40 connects the UE 10 to an external PDN (Packet Data Network) 110 and performs a packet filtering function. In addition, the P-GW 40 assigns an IP address to the UE 10 and operates as a mobility anchoring point when performing handover between the 3GPP system and the non-3GPP system. In particular, the P-GW 40 receives the Policy and Charging Control (PCC) rules from the Policy and Charging Rule Function (PCRF), applies it to the corresponding service flow, Billing function. The PCRF provides policy control decisions and billing control functions as entities that perform policy and billing control.

The MME 50 is a node that manages the mobility of the UE 10 and may be responsible for session management, idle subscriber management, paging, subscriber authentication, and the like. That is, the MME 50 may perform various functions of a control plane for processing a control signal when there is a binding request or a radio bearer setup request from the UE 10 or another network node, User profile information, authentication and location related data from the HSS 70, and performs functions such as setting up an EPS bearer or an IP tunnel, mobility management, and the like.

The MME 50 can recognize the position of the UE on the cell basis when the UE 10 is in an active state, i.e., in a state of communication, and can receive the location information of the eNB 20 installed in the cell where the UE 10 is located, And the like. When the MME 50 receives the location location request from the GMLC 60, the MME 50 requests paging to the eNB 20 installed in the cell when the UE 10 recognizes the cell in which the UE 10 is located, It is possible to request paging to all the eNBs 20 managed by the MME 50.

Herein, the paging operation refers to an operation to call a corresponding terminal when an incoming call (e.g., data reception, location location request) occurs to the terminal, and a predetermined number of times n () is set at a predetermined time interval during a predetermined paging time n is an integer equal to or greater than 1) times. The terminal receiving the paging message transmits a response to the paging message to the eNB 20 and the receiving eNB 20 transmits the paging message to the MME 50 so that the MME 50 can grasp the location of the terminal.

When the MME 50 recognizes the location of the terminal, the MME 50 performs location positioning in cooperation with the eSMLC 90, and transmits the location information about the accurate location of the terminal to the location location request of the GMLC 60 As shown in FIG.

Here, the method of performing location positioning in cooperation with the eSMLC 90 may be a CID (Cell ID) method, an E-CID (Enhanced Cell ID) method, an Observed Time Difference of Arrival (OTDOA) Can be used.

If the MME 50 can not determine the location of the terminal, the MME 50 may transmit a positioning failure message indicating that the positioning of the terminal has failed, in response to the location location request of the GMLC 60.

The GMLC 60 receives a location location request from the AGENT 80 and transmits an MME information request including user information (e.g., a subscriber number) to the HSS 70, And can identify the MME 50 corresponding to the MME information. The GMLC 60 transmits the location location request to the identified MME 50 and transmits the location information of the UE 10 or the positioning failure message to the location location of the AGENT 80 according to the paging and location location result of the MME 50 It can be sent in response to a request.

The HSS 70 is a central database for storing a subscriber profile, and provides the MME 50 with user authentication information and a user profile. The HSS 70 may also store MME information that is information about the MME 50 that the UE 10 last registered with and may provide the MME information to the GMLC 60 at the request of the GMLC 60 have.

The AGENT 80 may receive a request for location of an external UE 10 and may transmit a location location request including the user information of the UE 10 (e.g., subscriber number) to the GMLC 60.

The eSMLC 90 performs positioning of the UE 10 according to a request from the MME 50 and generates location information on the precise location of the UE 10 and provides the location information to the MME 50. As described above, the CID scheme, the E-CID scheme, the OTDOA scheme, or the like can be used at the time of positioning.

PDN 110 refers to a network that is connected to an end user communicating with the UE 10.

Hereinafter, the interface between the elements constituting the LTE network 1 will be briefly described.

The LTE-Uu 15 provides a control plane and a user plane with a radio interface between the UE 10 and the eNB 20. [

The S1-U 25 is an interface between the eNB 20 and the S-GW 30, and provides a user plane. At this time, GTP (GPRS Tunneling Protocol) tunneling (GTP-U) for each bearer is provided.

X2 26 is an interface between the two eNBs 20, providing a control plane and a user plane. The X2-AP protocol is used in the control plane and GTP tunneling per bearer for data forwarding in the X2 handover in the user plane.

S5 35 is an interface between the S-GW 30 and the P-GW 40, providing a control plane and a user plane. At this time, the user plane provides bearer-specific GTP tunneling (GTP-U), and the control plane provides GTP tunnel management (GTP-C).

SGi 45 defines a user plane and a control plane as an interface between the P-GW 40 and the PDN 110. In the user plane, IETF based IP packet forwarding protocol is used, and in the control plane, protocols such as DHCP and RADIUS / Diameter are used.

S11 55 defines a control plane as an interface between the MME 50 and the S-GW 30, and GTP tunneling for each bearer is provided.

The S1-MME 75 is an interface between the eNB 20 and the MME 50, and a control plane is defined, and the S1-AP protocol is used.

FIG. 2 is a diagram for explaining a problem occurring in positioning of a terminal.

Referring to FIG. 2, a first area A1 and a second area A2 are shown. The first area A1 means an area managed by a serving MME (50-1 in Fig. 3), and the second area A2 means an area managed by a target MME 50-2 it means. Here, the serving MME 50-1 is an MME for managing an eNB to which the UE 10 is connected before the movement, and the target MME 50-2 is an MME for managing an eNB to which the UE 10 is connected after the movement, .

Although only two eNBs 20 are illustrated in FIG. 1 for the sake of convenience, the present invention can be applied to various types of multimedia services including, for example, communication services for several hundreds to several thousand eNBs (e.g., multimedia services including voice services, Service) can be controlled by one MME 50, dozens of eNBs form one TA (Tracking Area) area, and several to several tens of TA areas can be controlled by one MME 50 Can be managed.

The UE 10 is located at the first point P1 in the first area A1 at the first point in time and moves after the point in time at the second point P2 in the second point A2 ).

When the UE 10 moves to the second area A2 while the UE 10 in the idle state tries to paging according to the position location request for the UE 10 after the first time point, the serving MME 50- 1 does not know the movement of the UE 10 and the paging fails (no response is received). Accordingly, the positioning failure message is transmitted to the AGENT 80 via the GMLC 60, and finally the positioning of the UE 10 fails.

If the UE 10 moves in the active state instead of in the idle state, the UE 10 performs a handover procedure. At this time, the serving MME 50-1 transmits the handover request message to the UE 10 10).

That is, when the UE 10 in the idle state moves in the MME boundary region, the positioning failure may occur due to the paging failure.

3 is a flowchart illustrating a positioning method of an LTE network according to an embodiment of the present invention.

3, the UE 10 is referred to as a serving eNB 20-1 or a first eNB, the eNB of the cell located at the first point P1 and to which the first point P1 belongs, and the serving eNB 20-1) is called a serving MME 50-1 or a first MME. After step S60, the UE 10 is located at the second point P2 and the eNB of the cell to which the second point P2 belongs is called the target eNB 20-2 or the second eNB, and the target eNB 20-2, Is referred to as a target MME 50-2 or a second MME. It is also assumed that the UE 10 is in an idle state.

The AGENT 80 may receive a request for location of an external UE 10 and may transmit a location location request including the user information of the UE 10 (e.g., subscriber number) to the GMLC 60 ).

The GMLC 60 may receive the location location request from the AGENT 80 and send an MME information request including the user information to the HSS 70 (S20). The MME information request is a message requesting to which MME the UE 10 is currently registered.

The HSS 70 searches the MME 50-1 where the UE 10 last registered the location based on the user information corresponding to the UE 10 and transmits MME information about the MME 50-1 IP address) to the GMLC 60 (S30).

The GMLC 60 may send a location location request for the UE 10 to the serving MME 50-1 identified based on the MME information (S40).

The serving MME 50-1 may request the serving eNB 20-1 where the UE 10 is registered to perform the paging operation (S50).

During the progress of the paging operation, the UE 10 moves from the first point P1 to the second point P2 (S60). That is, the UE 10 can not transmit a response to the paging by the serving eNB 20-1.

The UE 10 may request location registration with the target MME 50-2 via the target eNB 20-2 (S70).

The target MME 50-2 recognizes that the UE 10 in which the UE 10 was last located is the serving MME 50-1 according to the location registration request of the UE 10 and sends the MME 50-1 to the serving MME 50-1 And may request terminal information of the UE 10 (S80).

In accordance with one embodiment, the target MME 50-2 may be configured to allow the UE 10 to send a location registration request, based on the information (e.g., IP address) of the serving MME 50-1 included in the location registration request from the UE 10 Finally, it can recognize that the location-registered MME is the serving MME 50-1.

According to another embodiment, the target MME 50-2 receives the location registration request from the UE 10 and forwards the location registration request to the HSS 70 and then sends the location registration request to the serving MME 50-2, Based on the information (e.g., IP address) of the mobile terminal 50-1, that the UE 10 is the serving MME 50-1.

The serving MME 50-1 may receive the terminal information request for the UE 10 of the target MME 50-2 to recognize the movement of the UE 10 (S90).

At this time, the serving MME 50-1 recognizing the location movement of the UE 10 can ignore the message indicating that the paging for the currently performing UE 10 has failed from the serving eNB 20-1 have.

The serving MME 50-1 transmits a location movement message to the GMLS 60 indicating that the UE 10 has moved from the area managed by the serving MME 50-1 to the area managed by the target MME 50-2 (S100). The location movement message may include the IP address of the target MME 50-2 in the area where the UE 10 has moved.

The GMLC 60 may send a location location request for the UE 10 to the target MME 50-2 based on a location movement message informing the movement of the UE 10 received from the serving MME 50-1 (S110).

The target MME 50-2 may request the UE 10 to perform a paging operation with the target eNB 20-2 where the UE 10 is registered (S120).

The UE 10 having received the paging message from the target eNB 20-2 transmits a response to the paging message to the target MME 50-2 via the target eNB 20-2, May determine the location of the UE 10 (S130).

When the target MME 50-2 recognizes the position of the UE 10, the target MME 50-2 can perform positional positioning in cooperation with the eSMLC 90 to generate position information of the UE 10 (S140).

The target MME 50-2 transmits the location information of the UE 10 in response to the location location request of the GMLC 60 and the GMLC 60 transmits the location information of the UE 10 to the location of the AGENT 80 Or in response to a positioning request.

According to the positioning method of the LTE network according to the embodiment of the present invention, even if the terminal moves in the MME boundary during the paging operation for the location location request, So that the possibility of positional positioning failure can be reduced.

The method described above can be implemented as computer-readable code on a computer-readable recording medium. The computer-readable recording medium includes all kinds of recording media storing data that can be decoded by a computer system. For example, it may be a ROM (Read Only Memory), a RAM (Random Access Memory), a magnetic tape, a magnetic disk, a flash memory, an optical data storage device, or the like. In addition, the computer-readable recording medium may be distributed and executed in a computer system connected to a computer network, and may be stored and executed as a code readable in a distributed manner.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the invention as defined in the appended claims. It will be understood that various modifications and changes may be made.

Claims (14)

Receiving a location registration request from a target MME, which is located in the area of the target MME, while a paging operation is performed according to a request of a serving MME (Mobility Management Entity) receiving a location location request for the terminal;
The target MME requesting the terminal information of the terminal to the serving MME according to the location registration request of the terminal;
Receiving a location location request for the terminal, the location MME being generated according to the location movement message of the serving MME, the target MME having received the terminal information; And
Wherein the target MME requests paging to an Evolved Node B (eNB) in which the terminal is registered. The method according to claim 1,
Further comprising the step of the target MME recognizing the serving MME based on the IP address of the serving MME included in the location registration request of the terminal. The method according to claim 1,
Further comprising: after receiving the location registration request from the HSS, the target MME recognizing the serving MME based on the IP address of the serving MME included in the response from the HSS, A method of positioning a network. The method according to claim 1,
Receiving, by the target MME, a response to the paging message transmitted from the eNB through the eNB, the ping message being received from the eNB; And
Further comprising the step of the target MME determining a location of the terminal based on the response and performing location positioning. 5. The method of claim 4,
Wherein the location location is determined using one of a CID (Cell ID) scheme, an E-CID (Enhanced Cell ID) scheme, and an Observed Time Difference of Arrival (OTDOA) scheme. Receiving a location location request from a serving MME (Mobility Management Entity) and requesting paging from an eNB (Evolved Node B) where the mobile terminal is registered;
Receiving a request for terminal information of the terminal generated in response to a location registration request of the terminal that the serving MME has moved from the target MME to the area of the target MME during a paging operation according to the request; And
And transmitting the location movement message to the gateway mobile location center (GMLC) when the serving MME receives a request for the terminal information from the serving MME, the location location message indicating that the terminal has moved to the target MME area. . The method according to claim 6,
Wherein the request of the terminal information of the terminal is transmitted to the serving MME based on the IP address of the serving MME included in the location registration request of the terminal. The method according to claim 6,
The request for the terminal information of the terminal is transmitted to the serving MME based on the IP address of the serving MME included in the response from the HSS after transmitting the location registration request of the terminal to the HSS (Home Subscriber Server) A method of positioning a network. A serving MME (Mobility Management Entity) receiving a location location request for a terminal and requesting paging from an eNB (Evolved Node B) where the terminal is registered;
Receiving, by the target MME, a location registration request of the terminal moved to the area of the target MME during a paging operation according to a request for paging;
The serving MME receiving a request for terminal information of the terminal generated according to a location registration request of the terminal;
Transmitting, by the serving MME, a location movement message to the gateway mobile location center (GMLC) indicating that the mobile terminal has moved to the target MME area upon receipt of the request for the terminal information;
Receiving, by the target MME, a location location request for the terminal generated in accordance with the location movement message; And
And the target MME requests paging to the eNB where the terminal is registered. 10. The method of claim 9,
Further comprising the step of the target MME recognizing the serving MME based on the IP address of the serving MME included in the location registration request of the terminal. 10. The method of claim 9,
Further comprising the step of the target MME recognizing the serving MME based on the IP address of the serving MME included in the response from the HSS after passing the location registration request of the terminal to the Home Subscriber Server Position location method of LTE network. 10. The method of claim 9,
Receiving, by the target MME, a response to the paging message transmitted from the eNB through the eNB, the ping message being received from the eNB; And
Further comprising the step of the target MME determining a location of the terminal based on the response and performing location positioning. 13. The method of claim 12,
Wherein the location location is determined using one of a CID (Cell ID) scheme, an E-CID (Enhanced Cell ID) scheme, and an Observed Time Difference of Arrival (OTDOA) scheme. 10. The method of claim 9,
Wherein the location movement message includes an IP address of the target MME.

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