KR20080073512A - Method and apparatus for providing emergency calls in mobile communication system - Google Patents

Abstract

An emergency call service system in a mobile communication system and a system therefore are provided to enable a terminal to recognize an emergency call to send a newly added capacity negotiation message by setting the emergency call in the message, thereby offering an emergency service. A BS(Base Station) performs a synchronization acquisition process by using a ranging request message(301). The BS executes a capacity negotiation process by using a capacity negotiation message(303). The BS confirms whether an emergency service field is set within the capacity negotiation message(305). If not, the BS carries out an authentication process to connect with a service network(307). The BS conducts a registration process(309).

Description

Emergency call provision method and system according to the mobile communication system {METHOD AND APPARATUS FOR PROVIDING EMERGENCY CALLS IN MOBILE COMMUNICATION SYSTEM}

1 is a diagram schematically illustrating a communication system structure applied to an embodiment of the present invention.

2 is a signal flow diagram illustrating a method for providing emergency service in a Mobile WiMAX system according to the present invention.

3 is a flowchart illustrating a method for providing an emergency service at a base station in a communication system of the present invention.

The present invention relates to a service providing method and a system according to the communication system, and more particularly to an emergency call providing method and a system according to the communication system.

In such a communication system, services having high quality of service (QoS) will be provided to mobile terminals (MS) in the next generation communication system. Active research is underway to provide.

In the next generation communication system, Mobile WiMAX technology provides service users with voice services using VoIP as well as data services such as Internet and streaming services. In general, in the case of a service providing a wired or wireless communication network, an emergency service has been provided so that a user can use it in an emergency situation regardless of the applied technology. Therefore, the mobile WiMAX system must provide such an emergency service, and a stable and high-quality emergency service similar to that provided by the wired and wireless networks must be provided.

However, in the call processing procedure of the Mobile WiMAX system, the subscriber's call that is not registered and used in the service user's network because of the service unregistered cannot be used to access the emergency service because it is not allowed to access the network. This happens. In addition, even if the user normally registers and uses the service, there is a delay in accessing the service due to unnecessary authentication procedures.

Accordingly, an object of the present invention is to provide a method and a system according to which an emergency service can be provided regardless of a service used in a communication system.

Another object of the present invention is to provide a method and system according to the present invention which can provide an emergency service quickly in a communication system.

According to an aspect of the present invention, there is provided a method for requesting an emergency service by a terminal in a communication system for providing an emergency service, in which a terminal acquires synchronization using a ranging message with a base station at an initial entry and negotiates a capacity in which an emergency service field is set. And a first process of directly accessing the base station and the corresponding service network using the message.

The terminal of the present invention for achieving the above-mentioned characteristics is characterized by acquiring synchronization using the ranging message with the base station at the time of initial entry, and directly accesses the base station and the corresponding service network using the capacity negotiation message in which the emergency service field is set. .

According to an aspect of the present invention, there is provided a method for providing an emergency service by a base station in a communication system for providing an emergency service, the method comprising obtaining synchronization using a ranging message for initial registration from a terminal, and transmitting the same from the terminal. When the emergency service field is set in the capacity negotiation message, the authentication process may be omitted and the registration process may be performed.

The base station further comprises the step of setting the priority of the service grade (QoS) of the emergency service.

The base station of the present invention for achieving the above-mentioned, by using a ranging message for initial registration from the terminal to obtain synchronization, and if the emergency service field is set in the capacity negotiation message transmitted from the terminal, the authentication procedure is omitted Characterized in that the registration process is performed.

The base station is further characterized in that the operation of prioritizing the grade of service (QoS) of the emergency service.

In the system of the present invention for achieving the above-mentioned, when the emergency service occurs, the terminal to set the emergency service field in the capacity negotiation message and transmit to the base station, and if the emergency service field is confirmed, the authentication process is omitted and the registration process is performed. And a base station.

In the emergency service providing method of the present invention for achieving the above-mentioned, when the emergency service occurs, the terminal sets the emergency service field in the capacity negotiation message and transmits it to the base station, and if the emergency service field is confirmed, the authentication procedure is omitted. And performing a registration process.

DETAILED DESCRIPTION Hereinafter, detailed descriptions of preferred embodiments of the present invention will be described with reference to the accompanying drawings. It should be noted that the same components in the figures represent the same numerals wherever possible. Specific details are set forth in the following description, which is provided to aid a more general understanding of the invention. In the following description of the present invention, if it is determined that a detailed description of a related known function or configuration may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted.

The present invention proposes a method and system that can minimize service access time while providing emergency services to a user who does not normally use a service provider's network in a communication system. In order to facilitate the understanding of the present invention, a method of providing an emergency service in a communication system will be described first.

In the following description, a communication system applied to the present invention and a general emergency service providing method in the communication system will be described.

1 is a diagram schematically illustrating a communication system structure applied to an embodiment of the present invention. Referring to FIG. 1, the communication system includes terminals 120, 130, and 140, a base station 110, and an AAA (Authentication, Authorization, Accounting) server for checking whether the terminals are authenticated. The terminals 120, 130, and 140 perform an initial network entry procedure to communicate with the base station 110. The network entry procedure is generally divided into channel synchronization, ranging, capacity negotiation, authentication, registration, service flow creation, and the like. .

In this case, when the terminals 120, 130, 140 access the base station 110, the base station 110 may be in an overload state. At this time, the terminals 120, 130, and 140 in an overloaded state of the base station 110 use a CDMA code in a ranging procedure or a MAC address in a message ranging procedure. ), Or may be given priority from the base station 110 through a case of performing capacity negotiation or registration procedure.

In this case, in general, when the terminal 120 requesting an emergency call service occurs due to an emergency situation among the terminals 120, 130, and 140, a registration process should be performed as described above. Here, the emergency call service is assumed to be an emergency call service that allows the user of the terminal 120 to request a prompt call or to notify the user of an emergency through a message or the like when an emergency occurs. As an example of the emergency call service, there is a domestic '119 service' or an overseas '911 service'.

Upon requesting the emergency call service, the terminal 120 performs an SBC (SS Basic Capability) procedure for mutually negotiating the capability of a basic terminal (MS) including an authentication procedure that can be provided. Thereafter, the terminal performs a PKM (Privacy Key Management) procedure to perform the authentication procedure. In this case, if the terminal is not normally registered and used in the service provider's network, a negative response including an error code may be received from the AAA server 100 performing authentication. Upon receiving the response, the base station (BS) 110 includes a value of '0x04' in the action code variable to stop the network access attempt of the MS 120. -REGstration Request: A DREG-REQ) message is transmitted to the MS. For this reason, if the user is not registered and used in the service provider's network, the emergency service cannot be received.

In this case, in the present invention, an emergency service is made possible by omitting an authentication process performed upon initial entry into a network for a user's call to use an emergency service. Then, the emergency service providing method according to the present invention will be described with reference to FIG. Next, the emergency service request method according to the present invention will be described with reference to FIG. 2. In the following description, for convenience of description, a mobile WiMAX system will be described as an example, but it should be noted that it is basically applicable to all communication systems performing a registration and authentication process during initial registration.

2 is a signal flow diagram illustrating a method for providing an emergency service in a mobile WiMAX system according to the present invention.

The present invention recognizes that the call is an emergency call at initial access so that anyone can use the emergency service regardless of the registration of the service provider's network. It is composed of a mobile station (MS) 210 and a base station (BS) 220 constituting a network. The characteristics of each component are as follows.

The terminal 210 supports the IEEE 802.16 standard, and provides the user with a voice service using Voice over IP (VoIP) as well as data services such as the Internet and a streaming service. The base station 220 interfaces with a wireless connection according to the IEEE 802.16 standard, provides a connection to a wireless section to a subscriber, and performs scheduling based on MAC quality of service (QoS) information. In addition, it manages connection and mobility of subscribers, allocates a unique service flow for each uplink (UL / DL) connection, and performs authentication through an interface with the AAA server 230.

2, an emergency service providing method according to the present invention will be described. In FIG. 2, it is assumed that the terminal 210 is a terminal requesting an emergency service and is in an initial connection state.

Referring to FIG. 2, if the terminal 210 first requests a ranging request message (RNG-REQ) to the base station for ranging in step 231 for initial access, the base station 220 may perform the RNG in step 233. Whether to respond to the -REQ is transmitted to the terminal 210. Then, the authentication process between the terminal 210 and the base station 220 should be performed. In the present invention, the authentication process is omitted in the case of an emergency call so that the terminal can access the service network and receive an emergency service. To this end, the terminal 210 informs the emergency call in the capacity negotiation message transmitted to the base station.

In the case of the mobile WiMAX system of the present invention, the capacity negotiation message further defines and uses a field indicating an emergency call in the Authentication Policy Support variable of the SBC-REQ message as shown in FIG. do. The BSC-REQ message is shown in Table 1 below.

Referring to <Table 2>, referring to the BSC-REQ message, bits # 0 to # 2 are bits that use an authentication method based on RSA (Rivest Shamir Adleman) or EAP (Extensible Authentication Protocol) upon initial entry. to be. Bits # 4 to # 6 are bits that use an authentication method based on RSA (Rivest Shamir Adleman) or EAP (Extensible Authentication Protocol). In the present invention, the bit # 3 or the bit # 7 is used as a field indicating an emergency call. Table 1 shows an example of informing that an emergency call is made using bit # 3.

Upon receiving the capacity negotiation message, the base station 220 recognizes an emergency call from the terminal in step 237 and transmits an SBC-RSP message, which is a response message, to immediately perform a registration process without performing a PKM-REQ procedure. Upon receiving the response message, the terminal 231 transmits a registration message REG-REQ message to the base station 220 in step 238. In step 239, the base station 220 registers the terminal 210 and transmits a REG-RSA message corresponding to the terminal 210 to the terminal 210.

Thereafter, the terminal 210 and the base station 220 set a higher service class (QoS) than other services to be processed first in performing a dynamic service addition (DSA) process in steps 241 and 243. To help. This is for the case that the terminal is already connected to the service network, so that it can be processed faster than the emergency service. When the DSA process is completed, the base station 220 transmits a DSA-ACK message to the terminal 210.

Thereafter, the terminal 210 performs a dynamic host configuration protocol (DHCP) as in step 247. Since the DHCP process is not highly related to the gist of the present invention, it will be omitted.

As described above, the terminal recognizes the emergency call and adds a field indicating the emergency call to the capacity negotiation message, and the base station receives the capacity negotiation message and performs the emergency call operation accordingly. Here, the terminal can be easily implemented by adding a field indicating that it is an emergency call, but if the base station is an emergency call, the conventional registration process will be different.

As described above, the overall operation of the base station will be described with reference to FIG. 3.

3 is a flowchart illustrating a method for providing an emergency service at a base station in a communication system of the present invention. Referring to FIG. 3, the base station performs a synchronization acquisition process by using the lasing request message transmitted from the terminal in step 301. Thereafter, the base station performs a capacity negotiation process using the capacity negotiation message transmitted from the terminal in step 303. In step 305, the base station checks whether an emergency service field is set in the capacity negotiation message and confirms whether it is an emergency call.

If the call transmitted from the terminal is not an emergency call, the base station proceeds to step 307 and performs an authentication process for accessing the service network, and performs a registration process in step 309. However, in case of an emergency call, the base station skips the authentication process and proceeds to step 309 to perform the registration process. Therefore, in the present invention, if the call transmitted from the terminal is an emergency call, the terminal not using the service network can be provided with the emergency service by omitting the authentication process.

Meanwhile, in the detailed description of the present invention, the mobile WiMAX system has been mainly described, but it is basically applicable to a communication system that performs a registration process upon initial entry of a terminal. Accordingly, 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 determined not only by the scope of the following claims, but also by the equivalents of the claims.

As described above, the present invention recognizes that the terminal is an emergency call and sends an emergency call to the newly added capacity negotiation message, so that the network is not performed even if the user is not registered and used in the service provider's network. It is possible to access the emergency service can be provided. In addition, even a user registered and used in a service provider's network does not perform an authentication procedure by looking at a corresponding field, thereby shortening network access time for emergency services, thereby providing a faster service.

Claims (12)

In the communication system for providing an emergency service, the terminal requests an emergency service, Obtaining synchronization using the ranging message with the base station at the time of initial entry, emergency service request method comprising the step of directly accessing the base station and the corresponding service network using the capacity negotiation message set the emergency service field. The method of claim 1, wherein the capacity negotiation message, Emergency service request method, characterized in that the SBC request message. In the communication system for providing an emergency service, And a terminal for acquiring synchronization using a ranging message with a base station upon initial entry and directly accessing a corresponding service network with a base station using a capacity negotiation message having an emergency service field set. The method of claim 3, wherein the capacity negotiation message, Emergency service request device, characterized in that the SBC request message. In the communication system for providing an emergency service, the base station provides an emergency service, An emergency including a first process of acquiring synchronization using a ranging message for initial registration from a terminal and skipping an authentication procedure and performing a registration process when an emergency service field is set in a capacity negotiation message transmitted from the terminal How we deliver the service. The method of claim 5, The base station further comprises the step of setting the priority of the service grade (QoS) of the emergency service. The method of claim 3, wherein the capacity negotiation message, Emergency service providing method characterized in that the SBC request message. In the communication system for providing an emergency service, An emergency service providing apparatus for acquiring synchronization using a ranging message for initial registration from a terminal and skipping an authentication procedure when the emergency service field is set in the capacity negotiation message transmitted from the terminal. The method of claim 8, wherein the base station, And an emergency service requesting device further configured to prioritize a service grade (QoS) of the emergency service. The method of claim 8, wherein the capacity negotiation message, Emergency service providing apparatus, characterized in that the SBC request message. In the communication system for providing an emergency service, a method for providing an emergency service, When the terminal has an emergency service, sets an emergency service field in the capacity negotiation message and transmits it to the base station; Checking the emergency service field, skipping an authentication procedure and performing a registration process. In the communication system for providing an emergency service, A terminal for setting an emergency service field in a capacity negotiation message and transmitting the emergency service to a base station; And a base station for omitting an authentication procedure and performing a registration process when confirming the emergency service field.

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