KR20050079195A - Domain specific access restriction method for user equipment in mobile communication network - Google Patents

Abstract

The present invention relates to a method for performing access restriction by domain for connection state terminals provided with a service through a mobile communication network. The terminal receives and stores a domain access restriction parameter for the domains broadcast from the radio network controller (RNC), and then establishes an RRC connection with the RNC and accesses the stored domain access restriction to access one of the domains. Check the parameters. As a result of the check, if the access to the domain to be accessed is restricted, the access is abandoned. If not, the access to the domain to be accessed is attempted. If the domain access restriction parameter is changed, the RNC informs the connected state mobile terminals establishing the RRC connection with the RNC to the changed domain access restriction parameter, or the connected state terminals inform the broadcast domain access control parameter. Disconnect the connection state terminals so that they can be received. The present invention performs access restriction for each domain even for connection state terminals so that traffic of a connection state is not generated to the restricted access domain.

Description

Restriction method of mobile terminals by mobile terminal in mobile communication network {DOMAIN SPECIFIC ACCESS RESTRICTION METHOD FOR USER EQUIPMENT IN MOBILE COMMUNICATION NETWORK}

The present invention relates to a mobile communication system, and more particularly, to a method of performing access restriction for each domain for connection state terminals provided with a service through a mobile communication network.

Subscribers on wireless communications networks such as Cellular, Personal Communications Services, or International Mobile Telecommunication (IMT) -2000 communications systems can be connected via software or hardware to Internet-enabled mobile terminals, or notebook computers. You can access the Internet in any environment by connecting to your existing mobile phone using a modem.

In a digital mobile telephone network, a mobile communication network such as a European type Global System for Mobile communications (GSM) system can be divided into two parts. One is called a Radio Access Network (RAN) consisting of Base Stations (BSs) and Base Station Controllers (BSCs), each of which controls a plurality of base stations. The other is called a core network and consists of Mobile Switching Centers (MSCs) each responsible for a plurality of radio access networks.

The ongoing mobile communication standard, in particular the General Packet Radio Service (GPRS) communication system, developed from GSM, was developed to support packet switched services with GSM. The advent of GPRS has made it possible to efficiently add additional core networks to GSM systems. The GPRS core network is serviced by Serving GPRS Support Nodes (SGSNs) and Gateway GPRS Support Nodes (GGSNs).

Universal Mobile Telecommunications System (UMTS) is a third generation communication system developed to be combined with GPRS or similar packet switching systems. The UMTS communication system supports not only voice services but also packet data services that are faster than GPRS, enabling high-speed data communications and video communications. In a UMTS communication system, a wireless network is commonly referred to as a UMTS Radio Access Network (UTRAN) or simply a RAN, and the RAN is a Radio Network Controller corresponding to Node Bs corresponding to base stations and base station controllers. Controllers: RNCs.

Typically, Internet access through a UMTS system is through a Packet Switched Network. The mobile terminal wishing to access the Internet requests Internet access to the GGSN through the Node B and the radio network controller. GGSN forwards the request to the Internet access server via the Internet. In general, an Internet access server is an Internet service provider that operates independently of a mobile communication network. In some cases, however, the Internet access server acts as a component of the mobile communication network as needed, such as assigning an Internet Protocol (IP) address to the mobile terminal.

A communication network may be divided into domains composed of relatively large areas and nodes providing communication services therein. Representatively, a connection-based circuit switched domain (CS Domain) providing voice-oriented communication service services and a connection-free packet switched domain (PS Domain) providing high-speed packet data services. There is this. Each domain manages a separate user profile for the registered terminals, and the terminals may establish a separate connection for each domain. In this case, the terminal connected to the circuit switched domain is called a circuit switched connection state (CS-Connected), and the terminal connected to the packet switched domain is called a packet switched connection state (PS-Connected).

In the UMTS communication network, the network access of the terminal may be controlled for each cell for the terminals that are not connected to any domain, that is, the idle state. The System Information Block (SIB) provided to the UEs in the idle state from the system includes information called an access class barred list, and the list includes radio resource control (RRC) in the cell. Access classes for which connection attempts are forbidden are listed. Therefore, among the terminals that do not have an RRC connection, terminals corresponding to the access class included in the access prohibited access class list cannot attempt RRC connection in the corresponding cell.

The above method can be effectively used when an overload occurs in the radio channel. For example, if too many terminals are communicating in a cell and cannot provide services to other terminals wishing to initiate a new call, the RNC adjusts the cell's access control access list to generate new traffic. To prevent.

However, the prior art operating as described above is basically intended to overcome an overload situation on a wireless channel, and thus cannot be individually applied to a CS domain (Circuit Switched Domain) or a PS domain (Packet Switched Domain). That is, under special circumstances, the operator may need to perform access control for each domain of the connected state.

For example, when a natural disaster such as an earthquake occurs and a wireless channel state of a cell is good, the core network device of the CS domain connected to the cell is overloaded. In this case, many people try to send and receive a hello call, and congestion occurs only in the CS domain, which may result in the need to temporarily limit the voice call service. However, for terminals wishing to use packet services, access to the PS domain should be allowed. In other words, there is a need to restrict access to different domains.

Accordingly, an object of the present invention, which was devised to solve the problems of the prior art operating as described above, is to provide a method for enabling access restriction for each domain to terminals connected in a mobile communication system.

An embodiment of the present invention devised to achieve the above object is a mobile terminal in a mobile communication system serving mobile terminals by a radio network controller (RNC) and connecting the mobile terminals to at least two domains. A method for accessing the domains by means of

Receiving and storing a domain access restriction parameter for the domains broadcast from the wireless network controller;

Establishing a radio resource control (RRC) connection with the radio network controller (RNC) and identifying the stored domain access restriction parameters to access one of the domains;

As a result of the check, if the access to the domain to be accessed is restricted, the access is abandoned. If not, the access to the domain to be accessed is included.

Another embodiment of the present invention provides a mobile communication system for serving mobile terminals by a radio network controller (RNC) and connecting the mobile terminals to at least two different domains by the wireless network controller. In a method for restricting access to domains,

Setting domain access restriction parameters for the domains;

Broadcasting the domain access restriction parameter to be received by idle terminals located within a service area of the wireless network controller;

And when the domain access restriction parameter is changed, informing the connected mobile station establishing a radio resource control (RRC) connection with the radio network controller to the changed domain access restriction parameter.

Still another embodiment of the present invention provides a method of providing mobile terminal services by a wireless network controller in a mobile communication system that services mobile terminals by a radio network controller (RNC) and connects the mobile terminals to at least two different domains. In a method for restricting access to the domains,

Setting domain access restriction parameters for the domains;

Broadcasting the domain access restriction parameter to be received by idle terminals located within a service area of the wireless network controller;

When the domain access restriction parameter is changed, the connection state terminals establishing a radio resource control (RRC) connection with the radio network controller may disconnect the connection state terminals to receive the broadcast domain access control parameter. It characterized in that it comprises a process of releasing.

Hereinafter, with reference to the accompanying drawings will be described in detail the operating principle of the preferred embodiment of the present invention. In the following description of the present invention, detailed descriptions of well-known functions or configurations will be omitted if it is determined that the detailed description of the present invention may unnecessarily obscure the subject matter of the present invention. Terms to be described later are terms defined in consideration of functions in the present invention, and may be changed according to intentions or customs of users or operators. Therefore, the definition should be made based on the contents throughout the specification.

The present invention described below relates to domain specific access control for a terminal in a connected state. This is possible by the connection state terminal referencing a Domain Specific Access Restriction Parameter (DSARP) provided through system information.

1 shows a configuration of a communication network to which the present invention is applied. It shows a Radio Network Controller (RNC) 10 connected to the circuit switched domain 22 and the packet switched domain 24. The RNC 10 controls a plurality of Node Bs 12, 14, and 16 so that a radio connection of a terminal 20 located in each cell 18, that is, radio resource control (RRC) connection To control.

Referring to FIG. 1, the RNC 10 notifies a terminal in a connected state when a change occurs in a domain access restriction parameter (DSARP). The domain access restriction parameter may be included in a system information block (SIB), in particular SIB 3, transmitted from the system to the terminals. The domain access restriction parameter is composed of an identifier (eg, CS or PS) of a domain to execute domain access restriction and a list of access classes for which access to the domain is prohibited.

If the RNC learns that a domain, for example the CS domain, is overloaded and must restrict access to that domain, the RNC sets up domain access parameters for the CS domain and broadcasts it periodically to the cells it manages. do. The terminal located in the cell interprets the system information block to determine whether to set a domain access restriction parameter, and if the domain access is restricted, does not generate traffic to the domain. It does not request call setup. Access restriction is performed for each domain through the above RNC and terminal dnk operations.

However, since the system information block is received only by terminals idle in the service area of the RNC, terminals already having a radio connection, that is, an RRC connection, with the RNC cannot obtain the system information block. Therefore, the present specification proposes a domain access restriction method that can be applied to connected terminals.

The terms used frequently in this specification are briefly summarized below.

An access class (AC) is an integer between 0 and 15, and is assigned to each user, that is, a terminal. In general, the lower the number of assigned access classes, the faster the network can be accessed. The access class is stored in a subscriber interface module (SIM) card or the like, in which user information is stored, and transmitted to the terminal when necessary. The access class may be used to indicate whether the terminal can perform communication in a specific cell.

The idle state refers to a state of a terminal in which an RRC connection is not established. The RRC connection is a logical connection between the RNC and the terminal, which must be set up in order for the terminal to communicate with the network. The establishment of the RRC connection means that the RNC recognizes various types of information of the terminal and that periodic control signals are exchanged between the terminal and the RNC.

The connection state refers to a state of a terminal on which an RRC connection is established. The UE establishes the RRC connection in order to exchange control signals with the CS domain or the PS domain or to receive a service from a specific domain. For example, if the terminal intends to execute a voice call, the terminal must first establish an RRC connection with the RNC and then transmit a control signal to the CS domain.

The Initial Direct Transfer (IDT) message refers to a first message transmitted to a corresponding domain by a terminal that has established an RRC connection to access a specific domain. When the RNC receives the IDT message, the RNC establishes a connection to the corresponding domain to provide a communication path between the terminal and the domain.

The CS domain refers to a core network that provides circuit-based services such as voice communication, and the PS domain refers to a core network that provides packet-based services such as the Internet.

In the system as described above, which broadcasts the domain access restriction for a specific domain through the domain access restriction parameter, it is not possible to prevent the connected terminals from transmitting the IDT message to the restricted domain. When the IDT message is transmitted, the terminal can establish a call through the corresponding domain. Therefore, in a preferred embodiment of the present invention, if the terminal recognizes that the domain access restriction for a particular domain is achieved, whether the access class is included in the access control access list in transmitting an IDT message for the domain. Check it.

2 is a flowchart illustrating an operation procedure of a terminal according to an exemplary embodiment of the present invention. The gist of the illustrated terminal operation is that when a terminal acquires a domain access restriction parameter through a system information block (SIB), the domain access restriction parameter is used to transmit a message to the corresponding domain after entering the RRC connection state. .

Referring to FIG. 2, in step 105, the UE turns on the power to become an RRC idle state or moves to a new cell in the idle state to receive system information of the corresponding cell. The system information includes information necessary for the terminal to start communication in the cell. The system information is broadcast in a common channel in separate System Information Blocks (SIBs) according to the type of information. The terminal acquires a system information block received through a common channel, for example SIB 3, and proceeds to step 110. In step 110, the UE determines whether the SIB 3 includes a domain access restriction parameter.

If it is included, it means that the access restriction for each domain is applied. Therefore, if it is not included, it means that the access restriction for each domain is not applied. In step 115, the UE discards the system information received through SIB 3 when entering the connected state and does not consider the access class.

In step 120, the terminal transitions to the connection mode according to a user's request. Transitioning to the connected mode means that an RRC connection is established between the terminal and the network. In step 125, the terminal stores the obtained domain access restriction parameter. The domain access restriction parameter is composed of a domain identifier and an access class barred list. The domain identifier refers to an identifier of a domain to which domain access restriction is applied and may indicate a CS domain or a PS domain. The restricted access class list means a list of access classes that are not allowed to access the domain indicated by the domain identifier.

In step 130, an IDT message is transmitted to a domain indicated by the stored domain identifier of the DSARP, that is, a domain to which domain access restriction is applied. The IDT message is a message delivered to the CS domain or the PS domain, and the RNC relays the message to the appropriate domain. The IDT may include various higher layer messages. For example, a response message for paging, a message for updating location information, or the like is transmitted to the CS domain or the PS domain through the IDT.

In step 135, the UE checks whether its access class is included in the restricted access class list of the DSARP. If so, branch to 140; if not, branch to 137.

In step 137, the terminal transmits the generated IDT message to the corresponding network through the RNC. This is because the access class of the terminal is an access class permitted to access a domain to which the IDT message is to be transmitted.

In step 140, the UE does not transmit the IDT message. In step 145, the UE notifies the upper layer that the IDT has not been transmitted because access to the domain to which the IDT message is to be transmitted is prohibited. Quit.

Through the above operation, the terminal is prevented from transmitting an IDT message, which is essential for establishing a new call, to a domain where access is prohibited, thereby restricting domain access to an overloaded domain.

When an overload situation occurs in a specific domain by the operation of the terminal as described above, it is possible to control not only the traffic generated by the idle terminal for the corresponding domain but also the traffic generated by the connected terminal for the corresponding domain. However, if the SIB 3 is used as described above, domain access restrictions cannot be applied to terminals that do not refer to the information described in the SIB 3 in the connected state. Therefore, another embodiment to be described later proposes an operation for notifying the UE of the connected state the change of the DSARP.

3 is a flowchart illustrating an operation of an RNC for notifying connection state terminals of access restriction information for a specific domain according to a preferred embodiment of the present invention.

Referring to FIG. 3, in step 205, the RNC sets a domain access restriction parameter for a specific domain x. Although not shown separately, the configured domain access restriction parameter is periodically broadcast in each cell through SIB 3.

In step 210, the domain access restriction parameter for the domain x is changed. For example, for the CS domain, the list of restricted access classes was [AC 5,6,7,8,9,10,11,12,13,14,15]. , 12, 13, 14, 15]. That is, before the change, only terminals of class 4 or lower can access the CS domain, but after the change, terminals of class 10 or lower can access the CS domain.

In step 215, the RNC updates SIB 3 to reflect the changed domain access restriction parameter and periodically broadcasts through each cell. In step 220, the RNC transmits a message including the changed domain access restriction parameter to terminals in a connected state that establishes an RRC connection with the RNC. For example, the message may be a UTRAN Mobility Information (UMI) message.

The UEs connected in the service area of the RNC acquire the domain access restriction parameter through the UTRAN mobility information message, and perform the same operations as those of the above-described steps of 110 of FIG. 2.

4 is a flowchart illustrating an operation of an RNC for notifying connection state terminals of access restriction information for a specific domain according to another embodiment of the present invention.

Referring to FIG. 4, in step 305, the RNC sets a domain access restriction parameter for a specific domain x. Although not shown separately, the configured domain access restriction parameter is periodically broadcast in each cell through SIB 3. In step 310, the domain access restriction parameter for the domain x is changed.

In step 415, the RNC updates SIB 3 to reflect the changed domain access restriction parameter and periodically broadcasts through each cell. In step 420, the RNC releases the RRC connections of the connection state terminals establishing the RRC connection with the RNC.

UEs released from the RRC connection transition to an idle state, and receive SIB 3 like other UEs in an idle state to obtain system information again. This allows the terminals to obtain the updated domain access restriction parameters. In step 420, the RRC connection is not released to UEs that are substantially exchanging data through another domain in the connected state, and is released after confirming that the data exchange is completed. In other cases, the RNC may release the RRC connection for the connected state terminals that are performing data exchange.

5 is a flowchart illustrating the operation of an RNC that receives an IDT message from a terminal to a restricted domain according to an embodiment of the present invention. This is to support terminals already connected or legacy terminals before the change of access restriction parameter is reflected in SIB 3.

Referring to FIG. 5, in step 405, the RNC sets a domain access restriction parameter for domain x. Although not shown separately, the configured domain access parameter is periodically broadcast in each cell through SIB 3.

In step 410, the RNC receives an IDT message for the domain x. In step 415, the RNC delivers a domain access restriction parameter to the terminal that sent the IDT message. The domain access restriction parameter is delivered to the terminal in a UTRAN mobility information message.

The domain access restriction parameter is obtained through the mobility information message, and it is determined whether the access class is allowed to access the domain x by performing an operation as described above with reference to FIG. 2.

Meanwhile, in the detailed description of the present invention, specific embodiments have been described, but various modifications are possible without departing from the scope of the present invention. Therefore, the scope of the present invention should not be limited to the described embodiments, but should be defined not only by the scope of the following claims, but also by those equivalent to the scope of the claims.

In the present invention operating as described in detail above, the effects obtained by the representative ones of the disclosed inventions will be briefly described as follows.

In the present invention, the UMTS mobile communication system supports domain access restriction parameters for terminals connected to each other in supporting access restriction for each domain, thereby preventing additional traffic from connecting to the restricted domain. In addition, there is an additional effect that the existing terminals in the connected state can obtain the domain access restriction parameter.

1 is a block diagram of a communication network to which the present invention is applied.

2 is a flowchart illustrating an operation procedure of a terminal according to an exemplary embodiment of the present invention.

3 is a flowchart illustrating an operation of an RNC for notifying connection state terminals of access restriction information for a specific domain according to a preferred embodiment of the present invention.

4 is a flowchart illustrating an operation of an RNC for notifying connection state terminals of access restriction information for a specific domain according to another embodiment of the present invention.

5 is a flowchart illustrating the operation of an RNC receiving an IDT message from a terminal to a restricted domain according to a preferred embodiment of the present invention.

Claims (9)

A method for accessing domains by mobile terminals in a mobile communication system serving mobile terminals by a radio network controller (RNC) and connecting the mobile terminals to at least two domains, the method comprising: Receiving and storing a domain access restriction parameter for the domains broadcast from the wireless network controller; Establishing a radio resource control (RRC) connection with the radio network controller (RNC) and identifying the stored domain access restriction parameters to access one of the domains; And if the access to the domain to be accessed is restricted as a result of the checking, abandoning the access, and if not, attempting to access the domain to be accessed. The method of claim 1, wherein the domain access restriction parameter, And identifiers of domains to which access restrictions are applied among the domains, and a list of access classes for which access to the domain indicated by the identifiers is prohibited. The method of claim 1, wherein the attempting process comprises: And transmitting an initial direct transmission (IDT) message to the domain to be accessed through the wireless network controller. Restricting access of the mobile terminals to the domains by the wireless network controller in a mobile communication system serving mobile terminals by a radio network controller (RNC) and connecting the mobile terminals to at least two different domains In the method for Setting domain access restriction parameters for the domains; Broadcasting the domain access restriction parameter to be received by idle terminals located within a service area of the wireless network controller; And when the domain access restriction parameter is changed, notifying the changed domain access restriction parameter to connected state mobile terminals that are establishing a radio resource control (RRC) connection with the radio network controller. . The method of claim 4, wherein the domain access restriction parameter, And identifiers of domains to which access restrictions are applied among the domains, and a list of access classes for which access to the domain indicated by the identifiers is prohibited. The method as claimed in claim 4, wherein the changed domain access restriction parameter is notified through a mobility information message. Restricting access of the mobile terminals to the domains by the wireless network controller in a mobile communication system serving mobile terminals by a radio network controller (RNC) and connecting the mobile terminals to at least two different domains In the method for Setting domain access restriction parameters for the domains; Broadcasting the domain access restriction parameter to be received by idle terminals located within a service area of the wireless network controller; When the domain access restriction parameter is changed, the connection state terminals establishing a radio resource control (RRC) connection with the radio network controller may disconnect the connection state terminals to receive the broadcast domain access control parameter. The method comprising the step of releasing. The method of claim 7, wherein the domain access restriction parameter, And identifiers of domains to which access restrictions are applied among the domains, and a list of access classes for which access to the domain indicated by the identifiers is prohibited. The method of claim 7, wherein the releasing step, The connection method of the connection state of the terminal, characterized in that for disconnecting the connection state of the non-data exchange terminal.