WO2012134058A2

WO2012134058A2 - Server in charge of control plane in mobile communication network, and method for controlling access

Info

Publication number: WO2012134058A2
Application number: PCT/KR2012/001162
Authority: WO
Inventors: 김현숙; 김래영; 김태현
Original assignee: 엘지전자 주식회사
Priority date: 2011-03-30
Filing date: 2012-02-16
Publication date: 2012-10-04
Also published as: WO2012134058A3

Abstract

The present invention provides a method for controlling an access in a server in charge of a control plane in a visited network. The method for controlling the access comprises the step of the server in charge receiving from a Home (e)NodeB an access request message or an update request message by a roaming terminal. The Home (e)NodeB can be operated as a closed subscriber group (CSG) or in a mixed access mode. The access control method further comprises the steps of: assessing whether a disagreement exists between the CSG related information in subscriber information of the roaming terminal obtained from a subscriber information server located in the home network of the roaming terminal, and the local CSG related information defined in the visited network; when a disagreement is found, controlling the access using priority information previously defined by the server in charge; and the server in charge transmitting to Home (e)NodeB an acceptance message or a denial message for the access of the update request message, according to the access control.

Description

Servers and Access Control Methods in Control Plane in Mobile Networks

The present invention relates to a mobile communication system, and more particularly to a Home (e) NodeB system in a mobile communication system.

The 3GPP, which enacts the technical specifications of 3G mobile communication systems, has developed LTE / SAE as part of efforts to optimize and improve the performance of 3GPP technologies since late 2004 in order to respond to various forums and new technologies related to 4G mobile communication. Started research on Long Term Evolution / System Architecture Evolution technology.

SAE, centered on 3GPP SA WG2, is a study on network technology aimed at determining network structure and supporting mobility between heterogeneous networks in parallel with LTE work of 3GPP TSG RAN. Recent important standardization issues of 3GPP Is one of. This is a work to develop a 3GPP system into a system supporting various radio access technologies based on IP, and has been aimed at an optimized packet-based system that minimizes transmission delay with improved data transmission capability.

The SAE high-level reference model defined by 3GPP SA WG2 includes non-roaming cases and roaming cases in various scenarios. For details, see 3GPP standard documents TS 23.401 and TS 23.402. See for more information. The network structure diagram of FIG. 1 is a simple reconfiguration.

1 is a structural diagram of an evolved mobile communication network.

One of the most distinctive features of the network architecture of FIG. 1 is that it is based on the eNodeB of Evolved UTRAN and the 2 Tier Model of Gateway of Core Network. The eNodeB is similar to the functions of NodeB and RNC of the existing UMTS system, but the gateway has SGSN / GGSN function of the existing system.

Another important feature is that the control plane and user plane between the access network and the core network are exchanged with different interfaces. In the existing UMTS system, there was a single interface between RNC and SGSN, whereas the MME (Mobility Management Entity), which handles control signals, has a structure separated from GW (Gateway). Two interfaces, MME and S1-U, will be used.

2 is a diagram illustrating (e) NodeB and Home (e) NodeB.

Attempts have been made to increase cell capacity in order to support high capacity services and interactive services such as multimedia contents and streaming in the 3rd or 4th generation mobile communication systems.

In other words, there is a method of allocating more frequency resources as a way to increase wireless capacity as communication and diffusion of multimedia technologies and various high-capacity transmission technologies are required, but more frequency is allocated to a plurality of users. Allocating resources is limited.

Approaches have been made to use higher frequency bands and reduce cell radius to increase cell capacity. Application of a small cell radius, such as a pico cell, enables the use of a higher band than the frequency used in existing cellular systems, which has the advantage of delivering more information. However, there is a disadvantage in that it is expensive because more base stations must be installed in the same area.

Recently, femto base stations such as Home (e) NodeB have been proposed during the approach of increasing cell capacity using such small cells.

(E) NodeB 20 shown in FIG. 2 corresponds to a macro base station, and Home (e) NodeB 30 shown in FIG. 2 may be a femto base station. In this specification, description will be made based on the terminology of 3GPP, and (e) NodeB 20 is used when referring to NodeB or eNodeB together. Also, Home (e) NodeB is used when referring to Home NodeB and Home eNodeB together.

Meanwhile, the cell of the Home (e) NodeB 30 has an open access mode, a closed access mode, and a hybrid access mode according to an access permission policy.

In the case of the open access mode, the Home (e) NodeB 30 cell provides a service without limitation for the serviceable terminals.

In the closed access mode, access to the Home (e) NodeB 30 cell is allowed only for user terminals allowed in the corresponding Home (e) NodeB 30 cell.

In this closed access mode, UMTS / EPS of the 3GPP standard proposes to support the cells of the Home (e) NodeB in the unit of Closed Subscriber Group (CSG). That is, one closed subscriber group (CSG) may be configured with one or more Home (e) NodeBs, and the terminal is also provided with a usage right for a cell of Home (e) NodeB in units of closed subscriber groups (CSGs). In this case, the terminal may have at least one available closed subscriber group (CSG), and may have time information allowed for each closed subscriber group (CSG). This is called the Allowed CSG List. This allowed CSG list is stored in the terminal and network entities such as MME, SGSN, MSC, HSS, HLR, and the like.

3 is an exemplary diagram illustrating an operation mode of a Home (e) NodeB.

The above-described femto base station, for example, Home (e) NodeB 30 has an open access mode of FIG. 3 (a), a closed access mode of FIG. 5 (b), and FIG. It can operate in three modes of hybrid access mode of c).

First, referring to FIG. 3A, an example of an open connection mode is shown. The open access mode means that all UEs can access without restricting access to the cell of the Home (e) NodeB 30 as defined above. Thus, as shown, the connection of the plurality of UEs 11, 12, 13 is all allowed.

Next, referring to FIG. 3B, an example of a closed access mode is shown. In the closed access mode, the Home (e) NodeB 30 operates as a closed subscriber group (CSG) cell. In other words, the Home (e) NodeB 30 allows access to only allowed user terminals. Home (e) NodeBs 30 have a CSG ID (s) that can provide services. Each user is licensed by CSG.

Finally, referring to FIG. 3 (c), an example of a hybrid access mode is shown.

The hybrid access mode acts like a CSG cell for providing services to a closed subscriber group (CSG), but allows terminal access of a non-closed subscriber group (non-CSG). As described above, even if the first UE 11 is not a CSG member, the first UE 11 may access the Home (e) NodeB 30.

In the above-described prior art, when the UE roams into the visited network, the Home (e) NodeB in the visited network operates in the mode for the closed subscriber group or when the UE operates in the mixed access mode. There is no clear technique for handling the connection of the UE in an environment where CSG subscriber information cannot be received from the CSG server.

However, in the visited network, the UE accesses the Home (e) NodeB to reduce the load of the macro base station, i.e., the NodeB, and in order to provide a specific service, the access processing of the UE should be prioritized. Techniques for this need to be presented.

Accordingly, this specification is intended to suggest such techniques or solutions.

In order to achieve the above object, the present disclosure provides a method for controlling access in a server in charge of a control plane in a visited network.

The access control method may include receiving, by the responsible server, an access request message or an update request message by a roaming terminal from Home (e) NodeB. Here, the Home (e) NodeB may be operated in a closed subscriber group (CSG) or in a mixed access mode.

In the access control method, there is a mismatch between CSG related information in subscriber information of the roaming terminal and local CSG related information defined in the visited network obtained from a subscriber information server located in the home network of the roaming terminal. Evaluating; If there is a mismatch, the server in charge performing access control using predefined priority information; The server may further include transmitting an acceptance message or a rejection message for the access or update request message to Home (e) NodeB according to the access control.

The priority information is a first element for instructing to prioritize any one of the CSG information included in the subscriber information and the CSG information defined in the visited network when there is the mismatch; It may include one or more of the second elements indicating whether the criteria of the access control is static or can be changed dynamically.

The priority information may further include one or more of information on an allowed level and information on CSG membership when the result is allowed in the access control.

The CSG related information or local CSG related information may include one or more of a CSG ID and an expiration time information.

The CSG related information or local CSG related information may further include the priority information.

The CSG-related information or local CSG-related information may include: information on whether CSG services are allowed in the visited network, information on CSG-related information allowed by the visited network, information on the level of CSG services allowed on the visited network, and the case where there is a mismatch. It may include one or more of the priority information for.

The priority information may be obtained from a server in the visited network that stores the local CSG information.

The priority information may be stored in advance in the responsible server.

The priority information may be stored in a policy and charging rule function (PCRF) server in the visited network.

In order to achieve the above object, the present disclosure provides a server in charge of the control plane in a visited network (Visited Network). The server may include a transceiver for receiving a connection request message or an update request message by a roaming terminal from a Home (e) NodeB. Here, the Home (e) NodeB may be operated in a closed subscriber group (CSG) or in a mixed access mode. The server evaluates whether there is a mismatch between the CSG related information in the roaming terminal subscriber information obtained from the subscriber information server located in the home network of the roaming terminal and the local CSG related information defined in the visited network. And, if there is a mismatch, the server in charge may include a control unit for performing the access control using the predefined priority information. In this case, the transceiver may transmit an acceptance message or rejection message for the access or update request message to Home (e) NodeB according to the access control.

According to one disclosure of the present specification, it is possible to efficiently provide a CSG service to a roaming UE in a visited network.

Therefore, by making the roaming UE accessible to the Home (e) NodeB in the visited network, it is possible to reduce the load of the macro base station, that is, (e) NodeB.

In addition, the roaming UE in the visited network eliminates unnecessary handover procedure that occurs when the roaming UE fails to access the Home (e) NodeB operating as a CSG.

1 is a structural diagram of an evolved mobile communication network.

2 is a diagram illustrating (e) NodeB and Home (e) NodeB.

3 is an exemplary diagram illustrating an operation mode of a Home (e) NodeB.

4 is an exemplary diagram illustrating a structure of a network including a home (e) NodeB.

5 is an exemplary diagram illustrating an interface between a Home (e) NodeB 300 and an MME 510 illustrated in FIG. 4 as a protocol stack.

6 shows a structure and an interface of a mobile communication network.

7 shows a process of attaching, ie, attaching, a UE to a network.

8 shows a protocol stack between the UE 100, the Home (e) NodeB 300, and the MME 510.

9 shows a protocol stack between the MME 510 and the HSS 590.

10 illustrates an interface in a scenario in which a terminal roams to a visited network but tries to continue to use a service of an operator in a home network, when data of a user plane passes through a home network.

11 illustrates an interface in a scenario in which a terminal roams to a visited network but tries to continue to use a service of an operator in a home network, in which data of a user plane passes through a home network.

12 illustrates a procedure of a UE roaming to a visited network according to an embodiment.

FIG. 13 illustrates the procedure shown in FIG. 12 in more detail.

14 illustrates a procedure of a UE roaming to a visited network according to another embodiment.

15 illustrates a procedure of a UE roaming to a visited network according to another embodiment.

16 is a block diagram illustrating an MME 510 according to the present invention.

The present invention is applied to the Home (e) NodeB system. At this time, Home (e) NodeB refers to Home NodeB and Home eNodeB. However, the present invention is not limited thereto and may be applied to all communication systems and methods to which the technical spirit of the present invention may be applied.

It is to be noted that the technical terms used herein are merely used to describe particular embodiments, and are not intended to limit the present invention. In addition, the technical terms used in the present specification should be interpreted as meanings generally understood by those skilled in the art unless they are specifically defined in this specification, and are overly inclusive. It should not be interpreted in the sense of or in the sense of being excessively reduced. In addition, when the technical terms used herein are incorrect technical terms that do not accurately represent the spirit of the present invention, it should be replaced with technical terms that can be understood correctly by those skilled in the art. In addition, the general terms used in the present invention should be interpreted as defined in the dictionary or according to the context before and after, and should not be interpreted in an excessively reduced sense.

Also, the singular forms used herein include the plural forms unless the context clearly indicates otherwise. In the present application, terms such as “consisting of” or “comprising” should not be construed as necessarily including all of the various components, or various steps described in the specification, wherein some of the components or some of the steps It should be construed that it may not be included or may further include additional components or steps.

In addition, terms including ordinal numbers, such as first and second, as used herein may be used to describe various components, but the components should not be limited by the terms. The terms are used only for the purpose of distinguishing one component from another. For example, without departing from the scope of the present invention, the first component may be referred to as the second component, and similarly, the second component may also be referred to as the first component.

When a component is said to be "connected" or "connected" to another component, it may be directly connected or connected to that other component, but there may be other components in between. On the other hand, when a component is said to be "directly connected" or "directly connected" to another component, it should be understood that there is no other component in between.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings, and the same or similar components will be given the same reference numerals regardless of the reference numerals, and redundant description thereof will be omitted. In addition, in describing the present invention, when it is determined that the detailed description of the related known technology may obscure the gist of the present invention, the detailed description thereof will be omitted. In addition, it is to be noted that the accompanying drawings are only for easily understanding the spirit of the present invention and are not to be construed as limiting the spirit of the present invention by the accompanying drawings. The spirit of the present invention should be construed to extend to all changes, equivalents, and substitutes in addition to the accompanying drawings.

For clarity, the following description will focus on 3GPP EUTRAN / EPC, but the technical spirit of the present invention is not limited thereto. In particular, although specific network entities are described around EUTRAN / EPC and refer to MME, they can be extended to other second network entities (e.g. Home (e) NodeB gateways, etc.) that determine paging. In addition, in the detailed description of the present invention, the Home (e) NodeB gateway (the node between the Home (e) NodeB and the core network) is described based on the omitted network structure, but in the network structure in which the Home (e) NodeB gateway exists. It can be extended to be used in a similar fashion.

Hereinafter, the term terminal is used, but the terminal may be referred to as a user equipment (UE), a mobile equipment (ME), or a mobile station (MS). In addition, the UE may be a portable device having a communication function such as a mobile phone, a PDA, a smart phone, a laptop, or the like, or may be a non-portable device such as a PC or a vehicle-mounted device.

Definition of Terms

Before describing with reference to the drawings, in order to help the understanding of the present invention, terms used herein will be briefly defined.

UMTS: Abbreviation for Universal Mobile Telecommunication System, which means the third generation mobile communication network.

EPS: An abbreviation for Evolved Packet System, it means an efficient network structure that simplifies network entities to support Evolved RAN by evolving the core network of the existing 3GPP system architecture and to increase the efficiency of packet networks.

NodeB: Base station of the UMTS network, the cell coverage size corresponds to a macro cell.

eNodeB: Base station of the EPS network, the cell coverage size corresponds to a macro cell.

(e) NodeB: A term referring to NodeB and eNodeB.

Home NodeB: The base station of the UMTS network, the cell coverage size corresponds to the femto cell. A 3GPP-based UE is connected to a mobile operator's network through a UTRAN wireless air interface.

Home eNodeB: Base station of EPS network, cell coverage size corresponds to femto cell. A 3GPP-based UE is connected to a mobile operator's network through an E-UTRAN wireless air interface.

Home (e) NodeB: It refers to the Home NodeB and Home eNodeB.

Home (e) NodeB Gateway: A gateway that interfaces with one or more Home (e) NodeBs to be connected to the core network. Home (e) NodeB Subsystem: Home (e) NodeB gateway is a network structure that is implemented together, it manages wireless network by combining Home (e) NodeB and Home (e) NodeB gateway into one set. The Home (e) NodeB Subsystem and the Home (e) NodeB both manage wireless networks and interoperate with the core network, so they can be thought of as an aggregate. Therefore, hereinafter, the terms Home (e) NodeB and Home (e) NodeB subsystem are used interchangeably.

RAN: Radio Access Network is a generic term for 3GPP wireless access such as RNC, NodeB, eNodeB.

Home Location Register (HLR) / Home Subscriber Server (HSS): A database representing subscriber information in a 3GPP network.

RANAP: Abbreviation for Radio Access Network Application Part. It means the interface between RAN and the node (MME / SGSN / MSC) in charge of control of core network.

Closed Subscriber Group (CSG): Home (e) Refers to a specific membership group based on subscriber information in order to allow access only to user terminals allowed in a cell of a NodeB.

Open Access Mode: Home (e) NodeB operates in the same way as a normal cell (normal cell, non-CSG cell) without the concept of CSG. That is, it works like a normal (e) NodeB.

Closed Access Mode: Home (e) NodeB operates as a CSG cell. It refers to operating in a manner that allows access to only user terminals allowed in the cell. That is, only a terminal having authority for specific CSG IDs supported by Home (e) NodeB can be accessed.

Hybrid access mode: Home (e) NodeB operates as a CSG cell, but allows access to non-CSG subscribers. It is possible to provide a Home (e) NodeB service by allowing access to a user terminal having a specific CSG ID that can be supported in a corresponding cell, and the UE without CSG authority operates in a manner that allows access.

CSG cell: As part of a PLMN cell, the CSG cell can only access members of the CSG group. To this end, the CSG cell broadcasts a CSG ID. CSG cells sharing the same ID may be identified or managed as a group for mobility management and billing.

CSG ID: An identifier broadcast by the CSG cell, used to facilitate access of an authenticated member of the CSG. The CSG ID is unique only within one PLMN.

Allowed CSG list: A list containing CSG identification information of CSGs to which a subscriber belongs, and is stored in the network and the UE.

Tracking Area: This is a basic unit for tracking the location of the UE 100 operating in idle mode. That is, it is a basic unit for location registration of the UE. This specific area ID is called a Tracking Area Identity (TAI). In EPS, for efficient mobility management in the idle mode of the UE, the terminal may simultaneously register the location to several TAs, and in this case, manage the TAI list.

TAI LIST: A set of location information, that is, (e) NodeB or Home (e) NodeB where location registration is performed on the HSS or HLR through the MME according to the location movement of the UE.

PCC (Policy and Charging Control): refers to the operation of operator policy and billing.

PCRF (Policy and Charging Rule Function): This is a functional network element that has a provider's policy and a charging rule to perform PCC. It provides a provider policy and a charging rule to other nodes.

Hereinafter, described in detail with reference to the drawings.

As shown in FIG. 4A, the core network 500 includes an MME 510, a Serving Gateway (S-GW) 520, an SGSN 560, and a Packet Data Network Gateway or PDN (P-GW). Gateway 530. In addition, the core network 500 may further include a PCRF 540 and an HSS 590.

4 (a) shows a Home NodeB 310 by UTRAN (UMTS Terrestrial Radio Access Network) and a Home eNodeB 320 by E-UTRAN (Evolved-UTRAN). The Home NodeB 310 by the UTRAN is connected to the SGSN 560 through a gateway 350. The Home eNodeB 320 by the E-UTRAN is connected to the MME 510 and the S-GW 520. In this case, a control signal is transmitted to the MME 510 and a user data signal is transmitted to the S-GW 520. In addition, a gateway 350 may exist between the Home eNodeB 320 and the MME 510 by the E-UTRAN.

As shown in FIG. 5, the Home eNodeB 300 and the MME 510 each include a first layer (physical layer), a second layer (media access control layer), and a third layer (IP) layer. ), Signaling Control Transmission Protocol (SCTP), and S1 Application Protocol (S1-AP).

The S1-AP is an application layer protocol between the Home eNodeB 300 and the MME 510. The SCTP ensures delivery of a signaling message between the Home eNodeB 320 and the MME 510.

6 shows a structure and an interface of a mobile communication network.

Referring to FIG. 6, the interface is as follows.

S1-MME: Interface for control plane protocol between E-UTRAN and MME.

S1-U: The interface between the E-UTRAN and the serving gateway for the bearer user plane and the path switched during handover.

S3: Enable the exchange of user and bearer information for mobility in the Idle and / or active states.

S4: Enables control and mobility support between the GPRS core and the 3GPP anchor functionality of the serving gateway. It also provides user plane tunneling when the tunnel is not configured.

S5: Enable tunneling and management of the user plane between the serving gateway and the PDN gateway. It may be used to reassign the serving gateway as the UE is moved.

S6a: Enable the transmission of subscriber and authentication data needed to authenticate (authorize / authorize) the evolved network system.

Gx: Used to transfer policy and charging rules from PCRF to PCEF.

S12: Interface between UTRAN and serving gateway for user plane tunneling when tunnel is established.

SGi: An interface between a PDN gateway and a packet data network. The packet data network may be a public external private or private packet data network, or may be an internal provider packet data network.

Rx: Interface between AF and PCRF.

FIG. 7 illustrates a process of attaching, ie, connecting, a UE to a network, and FIG. 8 illustrates a protocol stack between the UE 100, the Home (e) NodeB 300, and the MME 510. 9 shows the protocol stack between the MME 510 and the HSS 590.

1) First, the UE 100 transmits an Attach Request message to the Home (e) NodeB 300.

The attach request message is a message transmitted by the UE when initially attaching, such as when the UE is powered on, roaming, or handovers.

2) Then, the Home (e) NodeB 300 may receive the attach request message and transmit the received attach request message to the MME 510.

At this time, as can be seen with reference to Figure 8, the Attach request message transmitted to the MME 510 is transmitted through the S1-AP protocol on the S1-MME interface.

3) Subsequently, the UE 100 performs an authentication procedure with the HSS 550.

4) The MME 510 requests the HSS 550 to update the location of the UE 100 as necessary (S103). The MME 510 receives a location update response message.

In this case, the location update message includes subscriber information of the UE 100. At this time, as can be seen with reference to FIG. 9, the subscriber information is S6a inter.

Received via a face, the subscriber information is received via the Diameter protocol.

5-6) The MME 510 establishes a tunnel with the S-GW 520 and the P-GW 530. In detail, the MME 510 transmits a session creation request message, for example, a Create Session Request message, to the S-GW 520. Then, the S-GW 520 transmits the received Create Session Request message to the P-GW 530.

7) The P-GW 530 optionally performs a PCRF 540 and a PCRF Interaction procedure. In this case, the P-GW 530 may obtain a network operator policy through a PCRF Interaction procedure.

8-9) The P-GW 530 transmits a bearer creation response message, eg, a Create Session Response message, to the S-GW 520. As a result, a tunnel, for example, a session is created between the S-GW 520 and the P-GW 530, and the S-GW 520 and the P-GW 530 exchange TEIDs for data transmission. The TEID is a parameter that serves as an address for transmitting and receiving data. In this case, the session creation response message may include the aforementioned network operator policy. Meanwhile, when there is download data to be transmitted to the UE 100 by the P-GW 530, the P-GW 530 may transmit the generated data to the S-GW 520 through the generated bearer.

The S-GW 520 forwards the session creation response message, eg, Create Session Response message, to the MME 510. In this case, the session creation response message includes the TEID of the S-GW.

10) The MME 510 includes an attach approval message, for example, an Attach Accept message, in an S1-AP based initial context setting message, for example, an Initial Context Setup message, and transmits it to the Home (e) NodeB 300.

The attach grant message triggers radio bearer setup between the Home (e) NodeB 300 and the UE 100.

At this time, as can be seen with reference to Figure 8, the Attach accept message is delivered via the S1-AP protocol on the S1-MME interface.

11) The Home (e) NodeB 300 and the UE 100 perform an RRC connection procedure.

12) The Home (e) NodeB 300 transmits an initial context setup response message to the MME 510.

13) The UE 100 transmits an attach complete message, for example, an Attach Complete message, to the Home (e) NodeB 300.

14) The Home (e) NodeB 300 transmits an attach complete message, for example, an Attach Complete message, to the MME 510. As a result, a tunnel is established between the UE 100 and the S-GW 520. The attach complete message includes the TEID of the Home (e) NodeB 300. Thus, the UE 100 may transmit its uplink data to the S-GW 520 through the Home (e) NodeB 300.

On the other hand, the MME 510 transmits a bearer modification request message, for example, a Modify Bearer Request message, to the S-GW 520 in order to modify the established session, that is, the bearer. The bearer modification request message includes the TEID of the Home (e) NodeB 300. The S-GW 520 transmits the bearer modification request message to the P-GW 530, and the P-GW 530 transmits a response message, for example, an Update Bearer Response message. Then, the S-GW 520 transmits the response message to the MME 520. Through this procedure, when the configured bearer is updated, the S-GW 520 transmits downlink data to the UE 100 through the Home (e) NodeB 300.

19) If necessary, APN, PDN GW id, etc. need to be stored in the HSS in order to move to the non-3GPP access later, the HSS 590 registration process through a Notify Request message.

FIG. 10 illustrates an interface in a scenario in which the terminal roams to the visited network, but the service of the service provider in the home network continues to use the service of the user plane. Hereinafter, a description will be given focusing on an interface different from that of FIG. 6.

S8: An interface providing a user plane and a control plane between the serving network, that is, the serving gate in Visted-PLMN and the home network, that is, the PDN gateway in Home-PLMN.

11 illustrates an interface in a scenario in which a terminal roams into a visited network but wants to continue to use a service of an operator in a home network, when data of a user plane is a home network.

Specifically, the application functions are divided into FIGS. 8 (a) and 8 (b) according to whether they are in the home network or the visited network. In this case, the data of the user plane is not transmitted from the home network to the terminal in two cases, but is transmitted from the visited network to the terminal.

Hereinafter, a description will be given focusing on an interface different from those of FIGS. 6 and 10.

S9: Interface for exchanging policy and audit control information between Home-PCRF and Visited-PCRF.

Rx: The interface between the application function (AF) and the PCRF.

10 and 11, when roaming to the UE 100 visited network, the MME 510 in the visited network should acquire subscriber information from the HSS 590 in the home network of the UE 100. do. CSG related information may be included in the subscriber information. In this case, when the Home (e) NodeB 300 operates in the Closed Subscriber Group (CSG) mode, when the UE 100 performs the attach or location update process, The obtained CSG information may be used to determine whether to accept or reject the attach or location update process.

However, some problems may arise here.

For example, LTE and EPC have slightly different technologies depending on their release version. However, in the process of installing LTE and EPC equipment, operators can build different release versions of equipment, and thus HSS in the home network. Some of the subscriber information obtained from 590 may be incompatible in the visited network.

For example, if the release version of the home network does not support the CSG service as Rel-7, but the visited network supports the CSG service, if a UE, a subscriber in the home network, roams to the visited network, Since there is no CSG-related information in the HSS in the home network, the UE cannot receive CSG-related services in the visited network. In other words, at some point, a first operator has established a Rel-7 network, and a second operator having a roaming agreement with the first operator has established a Rel-8 network. Then, when the subscriber UE of the first provider roams to the network of the second provider, the UE cannot receive CSG service in the network of the second provider. Mostly, CSG services are likely to be provided in enterprise networks such as Starbucks or shopping malls, but there is no opportunity to provide useful services that can be opened to roaming subscribers.

On the other hand, in order to solve the above problems, let's say a separate agreement between the first provider and the second provider for the provision of a CSG service (called VCSG) for roaming UE. In this case, when the roaming UE 100 performs an attach or location update process, the MME 510 in the visited network obtains subscriber information of the roaming UE 100 from the HSS 590 in the home network. CSG related information by the consultation will be obtained in the visited network.

However, when the CSG related information obtained from the HSS in the home network and the CSG related information in the visited network are different, the MME 510 may not properly provide the CSG service to the roaming UE. For example, the information contained in the subscriber information obtained from the HSS of the home network is said to have membership for

CSG IDs

1,3,4, while the CSG related information obtained from the visited network is

CSG ID

2,4,5. If it is stored that there is a membership for the MME 510 does not know which CSG ID the roaming UE actually has a membership. As another example, if the UE roams to the visited network immediately after the UE expires for a particular CSG ID in the home network, the membership may not yet expire within the visited network, in which case the MME ( 510 may not correctly determine whether to provide a CSG service for the roaming UE.

Meanwhile, as described above, when the CSG related information cannot be obtained from the HSS in the home network, the visited network may not receive the CSG service. For example, when an MME in a visited network receives an attach request message, it obtains subscriber information from an HSS in a home network, and if there is no CSG related information in the subscriber information, the MME notifies the roaming UE of the attach rejection.

However, since the UE accesses to the home (e) NodeB in the visited network can reduce the load of the macro base station (e) NodeB, it is effective to provide CSG service by autonomously managing the CSG membership in the visited network. Can be.

However, this should only be focused on providing CSG services through autonomous CSG membership management in the visiting network when CSG related information cannot be obtained from the HSS in the home network.

On the contrary, if the CSG related information is obtained from the HSS in the home network, but there is a conflict between CSG related information managed autonomously in the visited network, the above-described problem is still not solved.

In particular, after the MME 510 in the visited network receives the attach request message from the roaming UE, for example, CSG related information in the subscriber information obtained from the HSS in the home network (any CSG ID1, Expiration-Date valid). If there is a conflict between the CSG related information (any CSG ID1, Expiration-Date not valid) managed autonomously in the visited network, the MME 510 may not process correctly.

Therefore, the following will propose a solution to this problem.

Briefly describing the solution, the MME 510 in the visited network determines whether the roaming UE can access the Home (e) NodeB operating as a CSG using one of the following information.

Whether the home network, i.e., H-PLMN, permits VCSG functionality;

-Home network, i.e. CSG information authorized by HPLMN (CSG ID and expiration time, etc.)

-CSG information (CSG ID and expiration time etc.) authorized by the visiting network, ie V-PLMN

-CSG related information from home network, HPLMN and visiting network, VHPLM

Priority between CSG information, if all can be received, especially if there is a conflict between the two

The level (to what extent the HPLMN permits the VCSG feature authorization) (e.g. authorization based only on authorization or only on local CSG-related information within the visited network) to the extent that it does not conflict with HPLMN information;

A granularity in which the home network, i.e. HPLMN, permits VCSG functionality, e.g. subscriber / UE in a specific group

-General Roaming agreement information

-Other policy of the home network, the policy of the visiting network, or the policy of the Home (e) NodeB operator (which is stored in the MME in the form of pre-configuration or from H (e) NB / H (e) NB GW); Can accept)

Hereinafter, the solutions will be described in detail with reference to the accompanying drawings.

As can be seen with reference to FIG. 12, the HSS 590 in the home network of the roaming UE 100, the Home (e) NodeB 300 and the MME 510 in the visited network are shown.

It is also shown that a local VCSG server 550 is included in the visited network. The local VCSG server 550 manages CSG membership autonomously in the visited network. Such a local VCXG server 550 may exist alone on the visited network or may be included in an HSS / HLR in the visited network. Alternatively, the local VCXG server 550 may be included in another node in the visited network.

1) First, the UE 100 transmits an Attach Request message or a Tracking Area Update (TAU) message to the Home (e) NodeB 300. The attach request message is a message transmitted by the UE when initially attaching, such as when the UE is powered on, roaming, or handovers.

3) MME 510 in the visited network obtains subscriber information of the UE from HSS 590 in the home network. The subscriber information may include roaming agreement information as well as CSG related information. The roaming agreement information may include at least one or more of the following information.

Table 1

Whether the home network, i.e., H-PLMN, permits the VCSG function: direct indication or implicit information transfer is possible;-the home network, i.e., CSG information (CSG ID and expiration time, etc.) authorized by the HPLMN; Priority between CSG information, for example, where there is a conflict between two information, especially when there is a possibility of receiving both CSG-related information from the network, namely HPLMN and the visited network, VHPLM: for example, always HPLMN information first, always VPLMN Information first, short expiration time first, long expiration time first, etc.-the level (to what extent the HPLMN permits VCSG functionality) by the home network, i.e., to the extent that it does not conflict with HPLMN information Permit only based on only local CSG-related information in the visited network or granularity in which the home network, ie, HPLMN, grants VCSG functionality, e.g. subscriber / UE of a specific group. General Roaming agreement information-other operators' policies of the home network, those of the visiting network, or the policies of the Home (e) NodeB operator (which are stored in the MME in a pre-configuration form or are stored in the HME (e) NB / H ( e) can be received from NB GW)

4-5) Meanwhile, the MME 510 may obtain and obtain local CSG related information from a local VCSG server 550 in the visited network.

The local CSG related information may include at least one of the following information.

TABLE 2

-CSG ID-expiry time-CSG information (CSG ID and expire time, etc.) authorized (provided) by the visited network, ie VPLMN-the level (to what extent the HPLMN permits VCSG feature authorization) Permitting only to the extent that it does not conflict with HPLMN information, or permitting the use of all local CSG information)-the granularity in which HPLMN allows VCSG functionality, e.g. subscribers / UEs of a specific group

The MME 510 may provide priority related information, such as VPLMN-VCSG-configuration information, for when there is a mismatch between the CSG related information obtained from the HSS and the local CSG related information from the local VCSG server 550 in the visited network. Can be obtained.

6) Meanwhile, the MME 510 performs access control on the attach request of the roaming UE based on the information obtained as described above. The information obtained according to the above is enumerated again for the purpose of understanding.

-CSG subscription information

The access mode of the Home (e) NodeB: one of open access mode, closed subscriber group mode and mixed access mode

Whether the HPLMN permits the VCSG function (on / off): Information can be delivered in either direct indication or implicit form.

CSG information authorized by VPLMN (CSG ID and expire time, etc.)

Priority between CSG information if both CLM information of HPLMN and VHPLM are valid, especially if there is a conflict between them.

-Home network, i.e., HPLMN, is the level for VCSG feature authorization

A granularity in which the home network, i.e. HPLMN, permits VCSG functionality, e.

-Information on other general roaming agreements;

If there is a discrepancy between the CSG related information obtained from the HSS and the local CSG related information, such as a policy of another (Home or Visited) operator or the H (e) NB owner, the MME may assign the priority. Access control is performed based on the related information, eg, VPLMN-VCSG-configuration information.

That is, when there is a collision between the obtained information, the MME 510 prioritizes the CSG information included in the subscriber information received from the home network (HPLMN) according to the priority information, for example, VPLMN-VCSG-configuration. Or, access control is performed by giving priority to CSG information received from a visited network (VPLMN).

Alternatively, when there is a conflict between the obtained information, the MME 510 may perform access control according to the priority related information defined in the CSG related information received from the HSS 590. Alternatively, when there is a conflict between the obtained information, the MME 510 may perform access control according to the priority related information defined in the local CSG related information.

7) The MME 510 transmits a message for accepting the attach request / TAU request, for example, an Attach Accept / TAU Accept message, or sends the attach request / TAU request according to a result of performing the access control. A reject message, for example, an Attach Reject / TAU Reject message, may be transmitted to the Home (e) NodeB 300.

8) Then, the Home (e) NodeB 300 transmits the received message to the UE (100).

9) Meanwhile, apart from the attach request or the TAU request process of the UE 100, the local VCSG server 550 may transmit CSG related information to the UE 100. For example, it can be delivered using OMA DM or OTA.

FIG. 13 illustrates the procedure shown in FIG. 12 in more detail.

Then, the Home (e) NodeB 300 includes its configuration information, specifically general configuration information, and connection mode information (open connection mode, closed connection mode, mixed connection mode) in the received attach request message. To the MME 510. As such, the Home (e) NodeB 300 includes the access mode information in the attach request message and transmits the same, so that the MME 510 acquires the access mode information is called a direct acquisition method. On the other hand, the MME 510 may acquire the access mode information through an indirect acquisition method.

Meanwhile, as shown with reference to FIG. 8, the Attach request message transmitted to the MME 510 is delivered through the S1-AP protocol on the S1-MME interface.

4) The MME 510 requests the HSS 550 to update the location of the UE 100 as needed. The MME 510 receives a location update response message. In this case, the location update message includes subscriber information of the UE (100).

At this time, the subscriber information is received through the S6a interface, as can be seen with reference to Figure 9, the subscriber information is received via the Diameter protocol.

The subscriber information may include one or more of CSG related information and roaming agreement information.

The CSG related information may include information on a CSG ID and an expiration time.

The roaming agreement information may include at least one or more of the following information.

TABLE 3

Whether the home network, i.e., H-PLMN, permits the VCSG function: direct indication or implicit information transfer is possible;-the home network, i.e., CSG information (CSG ID and expiration time, etc.) authorized by the HPLMN; Priority between CSG information, for example, where there is a conflict between two information, especially when there is a possibility of receiving both CSG-related information from the network, namely HPLMN and the visited network, VHPLM: for example, always HPLMN information first, always VPLMN Information first, short expiration time first, long expiration time first, etc.-the level (to what extent the HPLMN permits VCSG functionality) by the home network, i.e., to the extent that it does not conflict with HPLMN information Permit only based on only local CSG-related information within the visited network or granularity within the home network, i.e. granularity to which HPLMN grants VCSG functionality, e.g. subscriber / UE of a specific group. General Roaming agreement information-other operators' policies of the home network, those of the visited network, or the policies of the Home (e) NodeB operator (which are stored in the MME in a pre-configuration form or are stored in the HME (e) NB / H ( e) can be received from NB GW)

Meanwhile, the MME 510 transmits a local VCSG information request message to the local VCSG server 550 and receives a local VCSG information response message. The local VCSG information response message may include local CSG related information.

Table 4

-CSG information (CSG ID and expire time, etc.) authorized (provided) by the visiting network, ie VPLMN-Home network, i.e. the level (to what extent the HPLMN permits VCSG functionality), does not conflict with HPLMN information Permit only to the extent that they do not, or permit use of all local CSG information)-the granularity that the home network, ie HPLMN, authorizes VCSG functionality, e.

Meanwhile, the VPLMN-VCSG-configuration information may be included in the local VCSG information request message received from the local VCSG server 550.

The VPLMN-VCSG-configuration may include the following information.

Table 5

a) permission = VCSG-ALLOWED or NOT-VCSG-ALLOWED or VCSG-PART-ALLOWED- VCSG-ALLOWED: indicates that the visited network, ie, VPLMN, is authorized to use the VCSG feature-NOT-VCSG-ALLOWED: the visit VCSG-PART-ALLOWED indicates that the granularity using the VCSG function is not in PLMN units, and that the VCSG function is allowed for any particular list or user only. B) granularity = all VPLMN or specific CSG list (s) or specific user (s): indicates the unit to which the VCSG function is applied c) Action type = static or dynamic- VCSG information received from home network (HPLMN) and visited network (VPLMN) In case of inconsistency, indicate whether the MME's criteria are statically pre-configured or can be changed dynamically. D) Action = HPLMN info first, VPLMN info first, expiration time fi If there is a discrepancy between the VCSG information received from the rst-home network (HPLMN) and the visited network (VPLMN), if the criteria of the MME can be determined dynamically, several actions can be indicated as follows: -HPLMN info first: Based on the CSG information contained in the subscriber information received from the home network (HPLMN), the MME performs an assessment.- VPLMN info first: Local VCSG server in the visited network (VPLMN). Based on the information received from the MME, the MME performs an evaluation task:-expiration time first: The MME evaluates based on the end of the expiration time, or much more, regardless of where the information is received. (evaluation) work.

Note that the VPLMN-VCSG-configuration is not obtained from the local VCSG server 550, but may be included in the location update response message received from the HSS 550 described above.

Meanwhile, the MME 510 performs an access control on the attach request of the roaming UE based on the information obtained as described above. In detail, the MME 510 may accept or reject the attach request / TAU request according to a result of performing the access control.

That is, if the UE (100) is connected to the Home (e) NodeB (300) operating as the CSG, the MME (510) is CSG related information in the subscriber information received from the HSS (590), and Home ( e) Access control may be performed based on the access mode information of the NodeB 300 and the CSG information received from the local VCS server 550.

In this case, when there is a collision between the obtained information, the MME 510 may perform access control according to the above-described priority information, for example, contents included in the VPLMN-VCSG-configuration.

On the other hand, when it is determined based on the access mode information, it is determined that the Home (e) NodeB 300 operates in a mixed access mode, and the UE 100 does not have a CSG membership, the MME 510 While accepting the connection of the UE (100), it may provide a differentiated quality of service.

5-6) If the MME 510 accepts the attach request / TAU request according to a result of performing the access control, the MME 510 is an S-GW 520 and a P-GW. 530 and the tunnel is set up. In detail, the MME 510 transmits a session creation request message, for example, a Create Session Request message, to the S-GW 520. Then, the S-GW 520 transmits the received Create Session Request message to the P-GW 530.

7) The P-GW 530 optionally performs a PCRF 540 and a PCRF Interaction procedure. In this case, the P-GW 530 may obtain a network operator policy through a PCRF Interaction procedure. In this case, the PCRF may store the priority information, for example, VPLMN-VCSG-configuration. Accordingly, the P-GW 530 may obtain the priority information through a PCRF Interaction procedure.

8-9) The P-GW 530 transmits a bearer creation response message, eg, a Create Session Response message, to the S-GW 520. As a result, a tunnel, for example, a session is created between the S-GW 520 and the P-GW 530, and the S-GW 520 and the P-GW 530 exchange TEIDs for data transmission. The TEID is a parameter that serves as an address for transmitting and receiving data. In this case, the session creation response message may include the aforementioned network operator policy. When the P-GW 530 obtains the priority information through a PCRF Interaction procedure, the session creation response message may include the priority information.

Meanwhile, when there is download data to be transmitted to the UE 100 by the P-GW 530, the P-GW 530 may transmit the generated data to the S-GW 520 through the generated bearer.

The S-GW 520 forwards the session creation response message, eg, Create Session Response message, to the MME 510. In this case, the session creation response message includes the TEID of the S-GW. In this case, as described above, the session creation response message may include the priority information.

10) If the MME 510 does not perform access control in the above-described process, after receiving the session creation response message from the S-GW 520, the MME 510 may perform the access control. Here, if the priority information is included in the session creation response message, access control may be performed according to the priority information for inconsistency between the CSG related information.

The MME 510 includes an attach grant message, for example, an Attach Accept message, in an S1-AP based initial context setup message, for example, an Initial Context Setup message, and transmits it to the Home (e) NodeB 300.

At this time, the Attach accept message is transmitted through the S1-AP protocol on the S1-MME interface, as can be seen with reference to FIG.

The attach accept message may include a result of the access control. The result of the access control may include connection type information. The connection type information may include one of two pieces of information shown in Table 2 below.

Table 6

(1) Acceptance as a CSG member Home (e) If the NodeB is operating in closed connection mode or mixed connection mode, and the UE requesting connection is a CSG member that can be serviced by the corresponding Home (e) NodeB, the UE is CSG (2) Accept as a non-CSG member Home (e) NodeB operates in mixed connection mode, and if the requesting UE is not a CSG member provided by the corresponding Home (e) NodeB, Indicates that the UE requesting access is accepted as a non-CSG member.

11) The Home (e) NodeB 300 and the UE 100 perform an RRC connection procedure.

15) Meanwhile, the MME 510 may perform the aforementioned access control after receiving the attach complete message, for example, an Attach Complete message.

19) If necessary, APN, PDN GW id, etc. need to be stored in the HSS in order to move to the non-3GPP access later, the HSS 590 registration process through the Notify Request message.

On the other hand, the Home (e) NodeB (300) provides a service to the UE (100).

Specifically, the Home (e) NodeB (300) according to the received connection type information, 'Radio Resource Control (Radio Resource Control), such as rate control (diversion of establishment connection) or the like (Radio Resource Control) ) Function. For example, if there is not enough resources of the Home (e) NodeB, the Home (e) NodeB 300 sets the QoS of the UE corresponding to the non-CSG member to be lower than the QoS of the UE corresponding to the CSG member. Can be. In addition, the Home (e) NodeB 300 may set the priority of data to be transmitted to the UE corresponding to the non-CSG member when scheduling data to be low. Or, if the Home (e) NodeB 300 is no longer able to provide the service to the UE 100, such as when the CSG membership of the UE 100 expires, or terminates, another Home (e The UE 100 may be handed over to a NodeB cell (ie, another CSG cell) or a (e) NodeB cell (or a non-CSG cell) in charge of a macro cell.

Or, if the Home (e) NodeB 300 is no longer able to provide a service to the UE 100, such as lack of radio resources, the Home (e) NodeB (300) instead of stopping the service to replace the CSG member another Home (e) NodeB cell ( That is, the UE 100 may be handed over to (e) NodeB cell (or non-CSG cell) in charge of another CSG cell) or macro cell.

As described above, although FIG. 13 illustrates the MME 510 and the S-GW 520 based on the EPC, the concept of the present invention may be applied to the UMTS. In the case of UMTS, both the MME 510 and the S-GW 520 may be integrated into SGSN. Accordingly, the signal transmission and reception between the MME 510 and the S-GW 520 shown in FIG. 7 is not performed, and both are processed in the SGSN.

Referring to FIG. 14, unlike the FIG. 12, the MME 510 acquires only CSG information from the HSS 590 in the home network, and does not acquire roaming agreement information and information on whether to allow VCSG. Roaming agreement information and information on whether to allow VCSG is predefined in the local VCSG server 550, and if it is determined that the UE roams, the MME 510 obtains from the local VCSG server 550 . In this case, according to the roaming agreement information stored in the local VCSG server 550 and information on whether to allow VCSG, if the CSG service for the UE is not allowed, the local VCSG server 590 is allowed to roam agreement information and VCSG It does not transmit information on whether or not to the MME 510, and only informs that the CSG service is not allowed.

In addition, since the matters illustrated in FIG. 14 are similar to those of FIG. 12, those skilled in the art can easily grasp from the description of FIG. 12, and the description of FIG. 12 will not be repeated and repeated.

Referring to FIG. 15, unlike FIG. 12 and FIG. 14, the MME 510 previously stores one or more of information on whether a VCSG is allowed and local CSG information. In this case, for example, the MME 510 stores the UE 100 has previously accessed the visited network. In this case, the MME 510 has a context related to the UE, and may include one or more of the above information on whether the VCSG is allowed and local CSG information in the context.

In this case, when the UE 100 re-visits the visited network and makes an attach request or a TAU request, the MME 510 may recycle one or more of information on whether the VCSG is allowed and local CSG information. Or to the local CSG server 550 to check for recent updates. If there has been a recent update or an expiration time for the stored information has elapsed, the MME can obtain the updated information from the local CSG server.

In addition, since the items shown in FIG. 15 are similar to those of FIGS. 12 and 14, those skilled in the art can easily grasp from the description of FIG. 12, and the above description will not be repeated and will not be repeated.

On the other hand, unlike the above description, if there is a mismatch between the local CSG information and the CSG-related information obtained from the HSS in the home network, the information on the priority between the 510 information is displayed in the MME (510) The MME 510 may store information regarding this priority in advance.

As shown in FIG. 16, the MME 510 includes a storage unit 511, a controller 512, and a transceiver 513.

The storage means 511 stores the method shown in FIGS. 4 to 15.

The controller 512 controls the storage means and the transceiver.

Specifically, the controllers execute the methods stored in the storage means, respectively. The controller transmits the aforementioned signals through the transceiver.

Although the preferred embodiments of the present invention have been described above by way of example, the scope of the present invention is not limited to such specific embodiments, and the present invention is in various forms within the scope of the spirit and claims of the present invention. Can be modified, changed, or improved.

Claims

A method of controlling access at a server in charge of a control plane within a visited network,

Receiving, by the responsible server, a connection request message or an update request message by a roaming terminal from a Home (e) NodeB, wherein the Home (e) NodeB is operated or mixed as a Closed Subscriber Group (CSG) Is operated in connected mode;

Evaluating whether there is a mismatch between CSG related information in subscriber information of the roaming terminal obtained from a subscriber information server located in a home network of the roaming terminal and local CSG related information defined in the visited network;

If there is a mismatch, the server in charge performing access control using predefined priority information;

And sending, by the responsible server, an acceptance message or a rejection message for the access or update request message to a Home (e) NodeB according to the access control.
The method of claim 1, wherein the priority information is

A first element for instructing to prioritize any one of the CSG information included in the subscriber information and the CSG information defined in the visited network when there is the mismatch;

And at least one of a second element indicating whether the criterion of the access control is static or can be changed dynamically.
The method of claim 2, wherein the priority information is

When the resultant access is allowed to the access control, information on the level allowed;

And at least one of information about the CSG membership where permitted.
The method of claim 1, wherein the CSG related information or local CSG related information is

And at least one of a CSG ID and an expiration time information.
The method of claim 4, wherein the CSG related information or local CSG related information

The access control method further comprises the priority information.
The method of claim 4, wherein the CSG related information or local CSG related information

Information about whether CSG services are allowed in the visiting network,

Visiting network allowed CSG related information,

Information about the level of CSG services allowed in the visiting network,

And at least one of priority information for the case where there is a mismatch.
The method of claim 1, wherein the priority information is

And obtaining from a server in the visited network storing the local CSG information.
The method of claim 1, wherein the priority information is

And stored in advance in the responsible server.
The method of claim 1, wherein the priority information is

And a policy and charging rule function (PCRF) server in the visited network.
A server in charge of the control plane in a visited network,

A transceiver for receiving a connection request message or an update request message by a roaming terminal from a Home (e) NodeB, wherein the Home (e) NodeB is operated as a Closed Subscriber Group (CSG); or Operate in mixed connection mode;

Evaluate whether there is a mismatch between the CSG related information in the roaming terminal subscriber information obtained from the subscriber information server located in the home network of the roaming terminal and the local CSG related information defined in the visited network. If there is a control server includes a control unit for performing the access control by using the predefined priority information,

And the transmitting and receiving unit transmits an acceptance message or a rejection message for the access or update request message to Home (e) NodeB according to the access control.
The method of claim 10, wherein the priority information is

A first element for instructing to prioritize any one of the CSG information included in the subscriber information and the CSG information defined in the visited network when there is the mismatch;

And at least one of a second element indicating whether the criterion of said access control is static or can be changed dynamically.
The method of claim 10, wherein the priority information is

When the resultant access is allowed to the access control, information on the level allowed;

The server further comprises one or more of information about the CSG membership where allowed.
The method of claim 10, wherein the CSG related information or local CSG related information

A server comprising at least one of a CSG ID and an expiration time information.
The method according to claim 13, wherein the CSG related information or local CSG related information is

The server further comprises the priority information.
The method of claim 10, wherein the priority information is

And a server obtained from a server in the visited network storing the local CSG information.
The method of claim 1, wherein the priority information is

And a server, which is stored in advance in the server.