KR100907313B1 - Network inter-working system and Service providing method thereof - Google Patents

Abstract

The present invention relates to a network interworking system and a service providing method thereof, the method comprising: receiving a mobile communication service request from a mobile communication terminal connected to a visited network; A Home Gateway GPRS Support Node (HGGSN) of a home network transmits and receives data with a Visited Serving GPRS Support Node (VSGSN) of the visited network to provide a requested service from the terminal. Setting a Quality of Service (QoS) value that can be provided by the VSGSN; And a packet gateway support node (HGGSN) of the home network comprising transmitting data of the requested service to the terminal through an assigned wireless channel according to a set QoS value. Not only can the resources be used more efficiently, but they can also provide good quality services.

In addition, different charges may be imposed depending on the type of service used by the user of the terminal, thereby improving the reliability of the user's roaming service.

3GPP, GSM, WCDMA, Roaming, SGSN, GGSN, QoS

Description

Network interworking system and service providing method

1 is a flowchart illustrating a service providing method of a network interworking system according to the prior art;

2 is a block diagram showing the configuration of a network interworking system according to a preferred embodiment of the present invention, and

3 is a flowchart illustrating a service providing method of a network interworking system according to an exemplary embodiment of the present invention.

<Explanation of symbols for the main parts of the drawings>

N1: Home Mens N2: Visit Mens

10: HGGSN 20: VSGSN

30: Gateway

The present invention relates to a network interworking system and a service providing method thereof. In particular, an optimal quality of service (QoS) required for providing a service requested by the terminal when the terminal is connected to another network and another network to which the terminal is connected. The present invention relates to a network interworking system and a service providing method thereof so as to efficiently utilize network resources by negotiating to provide a.

Roaming is a service that enables communication within the service area of different service providers. If each service provider has its own service network, each service network is connected to each other, regardless of the user's location. It is a service that allows a good quality service provided by an operator to be provided.

Since the emergence of full-scale digital cellular-based second-generation mobile communication system, the third-generation mobile communication system for supporting higher-quality multimedia services regardless of region has been activated as a standard. By using the same wireless access method in a single frequency band, global roaming can be used to configure the whole world in a single coverage area, and supports high data transfer speeds of up to 2 Mbps with high bandwidth. It also provides wireless multimedia services such as video, video telephony and Internet access.

However, since the 3G mobile communication system has not been established throughout the region or the country, the 2G mobile communication service network and the 3G mobile communication service network are mixed so far. If you receive the service is not provided properly. 1 is a flowchart illustrating a service providing method of a network interworking system according to the prior art.

Referring to Figure 1 in more detail with respect to the problem of the service providing method of the network interworking system according to the prior art when the terminal receiving the third generation mobile communication service is connected to the second generation mobile communication network receives a roaming service, In step S10, the mobile communication terminal updates the region information where the terminal is currently located and transmits the updated location information to the third generation service network to which the terminal was originally connected.

Next, when a service request command to be provided through the terminal such as a voice call, a text message, a video call is input in step S20, the second generation service network to which the terminal is currently connected in step S30 is the terminal or the home of the terminal. A wireless channel is formed based on the quality of service of the terminal stored in the location register.

In operation S40, a service data packet for providing the requested service from the third generation service network to which the terminal is connected is transmitted to the terminal along a wireless channel formed in the second generation service network to provide the requested service. do.

In this case, the second generation service network that substantially transmits data to the terminal forms an allocated wireless channel according to a quality of service set at initial access, regardless of the type of service requested by the terminal.

Therefore, when the set service quality of the terminal is set to a high quality level to receive the 3rd generation mobile communication service, the service quality is set even in a case where a high service quality is not required, such as simply sending or receiving a text message or downloading data. A radio channel for a quality of service class is provided so that radio resources of the second generation service network are unnecessarily wasted. In addition, since the second generation service network provides a wireless channel that supports the quality of service set when the terminal makes an initial service request, the second generation service network may request a higher quality of service than the service initially requested. Although it can support this, there is a problem in that it is not possible to normally use a mobile communication service desired by a user by providing only a wireless channel provided at an initial connection.

In addition, even in terms of service billing, regardless of the type of service actually provided, a high rate is set according to an unconditionally set service quality or a wireless channel, thereby lowering the reliability of the roaming service and causing user complaints.

The present invention is to solve the above-described problems, when roaming by connecting to another network provides an optimal quality of service required to provide the service requested by the terminal between the network to which the terminal was originally connected and the other network connected; The purpose of the present invention is to provide a network interworking system and a service providing method thereof capable of providing a good quality service while efficiently using wireless network resources by negotiating with each other.

In addition, the network interworking system and its service can improve the user's reliability of the service provider to provide a service because it can be reasonably charged by providing a different grade of service quality for each different service requested by the terminal. Another purpose is to provide a method of providing.

A service providing method of a network interworking system according to the present invention for achieving the above object is a mobile communication service including a quality of service (QoS) value to be used from a mobile communication terminal connected to a visited network. Receiving a request message; The Visited Serving GPRS Support Node (VSGSN) of the visited network classifies the service quality values that can be provided for a mobile communication service by class, and provides a service quality that can be provided by a service quality value of a service requested from the mobile communication terminal. Determining whether it is a value; When the packet switched support node of the visited network cannot provide the service quality value of the requested service, transmitting a downlink adjustment query message including a service quality value available to the mobile communication terminal; And when a quality of service value corresponding to the downlink adjustment query message is set by the mobile communication terminal, a Home Gateway GPRS Support Node (HGGSN) of a home network according to the set quality of service value. And providing a mobile communication service corresponding to the request message to the mobile communication terminal.

Here, in the method for providing a service of the network interworking system, when the mobile communication terminal does not adjust the downlink corresponding to the downlink adjustment query message, selecting one of several pre-stored connectable networks and attempting to connect It may further include.

In this case, the packet-switching support node of the visited network may be classified by class for each parameter constituting a service quality value.

Further, the parameter constituting the provideable quality of service value preferably includes at least one of allocation / maintenance priority, traffic class, maximum SDU size, upward maximum bit rate, SDU error rate, traffic processing priority, and transmission delay.

On the other hand, in the network interworking system according to the present invention for achieving the above object, when the mobile communication terminal is connected to the other network to request a service, the requested service according to the service quality value corresponding to the requested service A packet gateway support node (HGGSN) of a home network for transmitting service data such that the service data is provided; And classify the service quality values that can be provided by grade, determine whether the service quality values corresponding to the requested service are service quality values, and if the service quality values corresponding to the requested service cannot be provided. A packet of a visited network transmitting a message for downgrading the quality of service to a mobile communication terminal and transmitting the service data received from the HGGSN to the mobile communication terminal by setting a wireless channel according to the adjusted service quality value. And an exchange support node (VSGSN).

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

2 is a block diagram showing a configuration of a network interworking system according to a preferred embodiment of the present invention, in the present specification, a mobile communication network to which a mobile communication terminal of the present invention is basically connected is a WCDMA type of 3G mobile communication service. The mobile communication network, which is a service network and reconnected by moving the terminal to another region, is described as an example of a GSM-based service network, which is a second generation mobile communication service, but is not limited thereto. Or, it can be applied to all networks having different amounts of radio resources.

2, in a network interworking system according to a preferred embodiment of the present invention, a mobile communication system to which a mobile communication terminal of the present invention is subscribed is a WCDMA mobile communication system.

Such a WCDMA system includes a wireless base station (UTRAN; UMTS Terrestrial Radio Access Network), a mobile switching center (MSC), a home location register (HLR) and a serving GPRS support node (SGSN), and gateway GPRS support (GGSN). Node) and Packet Data Network (PDN).

The wireless base station includes a Node-B and a Radio Network Controller (RNC). Node-B is connected to a mobile communication terminal according to the 3GPP wireless access standard through a transmission and reception antenna and connected to transmit and receive voice, video, and data traffic in a WCDMA manner. The internal subsystem of Node-B may be composed of a Base Station Interconnection Subsystem (BIS), a Baseband Subsystem (BBS), and an RF Subsystem.

The Radio Network Controller (RNC) manages multiple Node-Bs, and manages wired and wireless channels, protocol matching of mobile communication terminals, protocol matching of node-B, soft handoff processing, core network protocol processing, and GPRS (GPRS). General Packet Radio Service) It is in charge of the functions such as access, fault management, and system loading. GPRS is asynchronous communication service that supports data transmission speed of 115Kbps, provides multimedia mail, and maximizes transmission line efficiency by packet data transmission.

The mobile switching center has a soft switching structure to speed up call processing in addition to the basic switching function for telephone calls in the existing CDMA 2000 network. Here, soft switching is a technology for processing voice, data, and video signals into a high speed packet switch by implementing a circuit switch of a conventional exchange as a software switch.

Home Location Register (HLR) is a mobile communication subscriber database that receives location information of a mobile communication terminal and performs functions such as registration recognition, registration deletion, and location checking. The connection state of the terminal is checked and it is determined whether the terminal is in the standby mode or the active mode.

SGSN is a device for processing various data services with hardware structure that provides ATM-based switch and routing connection for GPRS service. It is responsible for data packet delivery with mobile communication terminal in service area, It has functions such as mobility management, logical link management and authentication, and SGSN's location register stores location information (cell, visitor location register, etc.), user profile (international mobile station identification number: IMSI), etc. of GPRS users registered in SGSN. do. The RNC and SGSN are connected by Iu interface, and between SGSN and HLR, MAP protocol can be used to retrieve user information including user location information.

At this time, in the network interworking system according to a preferred embodiment of the present invention, when the SGSN 20 of the visited network (N2) connected to the terminal sets the quality of service level that can be provided to the terminal, A channel is formed to allow data to be sent and received.

In addition, GGSN is a node in charge of the connection function between GPRS backbone network and external packet data network. It converts GPRS packets received from SGSN into appropriate packet data protocol (PDP) format and transmits them. Converts to the recipient's GSM address. It also stores the current user's SGSN address and user profile in the SGSN's location register and performs authentication and charging functions. Like the SGSN, the GGSN can transmit and receive control messages using the HLR and MAP protocols. The SGSN and the GGSN are connected to the Gn interface.

In particular, in the network interworking system of the present invention, the GGSN 10 of the home network (N1) to which the terminal is subscribed transmits and receives data with the SGSN (20) of the visited network (N2) to provide the service requested by the terminal. Set a quality of service grade to provide and charge while providing the requested service.

In addition, the network interworking system according to the present invention, if the specifications of the home network (N1) and the visited network (N2) is different from each other so that data can be smoothly transmitted and received between the home network (N1) and visited network (N2) It may be configured to further include a gateway 30 for converting data in accordance with the standard.

3 is a flowchart illustrating a service providing method of a network interworking system according to the present invention, and the present invention is limited by various data types and techniques disclosed to describe the operation of the present invention in more detail. Or, it can be easily applied for reasons such as a new standard for this field is formulated or the specific operation is changed by the operator.

In step S100, when the mobile communication terminal moves away from the home network to which the mobile communication terminal is connected, and moves to an area where the other network is constructed, the terminal is operated to update the location setting data of the terminal to the area where the terminal is located and to update the location setting. The data is transmitted to the home location register of the home network to which the user of the mobile communication terminal is subscribed.

In step S110, when a mobile communication service request command to be provided through the mobile communication terminal is input, in step S120, the mobile communication terminal activates a PDP context request message to request a session generation from the SGSN of the visited network to which the terminal is connected. Send (Active PDP Context Request). The message includes data such as whether to use a static address or a dynamic address and a quality of service value to be used.

At this time, the SGSN of the visited network determines in step S130 whether the QoS request value of the mobile communication terminal in the request message is a value that can be provided, and if it is a value, in step S140, the QoS request stored in the request message. The value data and the Create PDP Context Request message are transmitted to the GGSN of the home network.

Next, in step S150, GGSN (HGGSN) of the home network generates a PDP context (Context) by the Create PDP Context Request message received from the VSGSN, determine whether the QoS request value of the mobile communication terminal can provide If possible, in step S160, negotiate with the VSGSN an optimal quality of service value for providing a service requested by the terminal through a radio bearer service.

When negotiating the optimal quality of service value and setting the quality of service value to be provided, the home network's GGSN (HGGSN) allocates an address if it is a dynamic address and sends Create PDP Context Response to SGSN (VSGSN) of the visited network. Answer.

Next, in step S170, the SGSN (VSGSN) of the visited network stores the information about the received response and notifies the mobile communication terminal that the session is established, and wirelessly establishes the quality of service value with the RNC of the visited network. A radio access bearer (RAB) is set to allocate a radio channel by a bandwidth determined according to a set quality of service value. Also, the mobile communication terminal can receive a desired service through the SGSN of the visited network and the GGSN of the home network within the QoS range set through the allocated wireless channel.

In this case, in step S150, when the GGSN of the home network does not provide the request QoS value received from the terminal, a message for rejecting the request service is generated and transmitted to the terminal.

In addition, in step S130, when the SGSN of the visited network is unable to provide the request QoS value received from the terminal, in step S190 it is determined whether the SGSN of the visited network is adjusted down to the QoS value that can be provided according to the wireless environment. . That is, the SGSN of the visited network may generate and transmit a QoS downlink adjustment message to the terminal. The QoS downlink message may include the fact that it cannot provide the QoS requested by the SGSN of the visited network. This message is sent to ask the terminal whether the service is provided by adjusting downward. Therefore, in step S200, when a message indicating that QoS is to be adjusted downward is received from the terminal, the SGSN of the visited network adjusts the QoS value downward to form a wireless channel corresponding to the adjusted value.

In addition, in case of receiving the configuration data for QoS adjustment from the terminal in advance at the initial connection of the visited network and the terminal, it is determined whether to adjust the QoS according to the previously received configuration data without transmitting a separate QoS down adjustment message. Determine and form a wireless channel corresponding to the determined QoS value.

In this case, the downward adjustment of the QoS may be adjusted according to various QoS steps set in the SGSN of the visited network, and may be adjusted to the maximum QoS value that can be provided in the current wireless environment of the visited network.

Next, when the wireless channel is formed in the visited network, the GGSN transmits service data to the visited network so as to be provided to the terminal through the formed wireless channel.

On the other hand, if the QoS value is not adjusted down in step S190, in step S210, the terminal attempts to connect by selecting one of the networks other than the visited network currently connected from among the various mobile communication networks stored in the provided memory. If connected, the steps from S110 are repeated.

Through these steps, QoS values can be adjusted for various types of services used by the user to provide effective network resource usage and fast and improved wireless packet service.

On the other hand, the quality of service, for example, specifies how Packet Data Units (PDUs) will be processed in a GPRS network. For example, the quality of service defined for access addresses is used to control the GGSN in the presence of transmission order, buffering, rejection of packets at the support node, especially caches that are transmitted simultaneously on one or more connections.

The quality of service (QoS) value is composed of several parameters. The basic quality of service value includes allocation / maintenance priority, traffic class, maximum SDU size, uplink maximum bit rate, SDU error rate, traffic processing priority, and transmission delay. In this case, the allocation / maintenance priority is a value representing a relative priority of resource allocation and maintenance. Since the allocation / maintenance priority is not a value transmitted from the mobile communication terminal, the parameter value in the basic service quality is used as it is.

In the case of the traffic class, the WCDMA network classifies the traffic class according to the quality of service class into the conversational class, the streaming class, the interactive class, the background class ( Background class).

The conversational class is a kind of service that is mainly used for real-time traffic transmission, such as voice call or video call, and is very sensitive to transmission delay. Streaming class is a real-time traffic transmission service that provides data in the form of streaming such as video data, which is sensitive to transmission delay but less sensitive to transmission delay than interactive class. Interactive classes are services for interactive applications such as the World Wide Web (WWW) or Telnet, and background classes are for sending e-mails. , Downloading, and the like.

Among these classes are interactive services and background classes, which are primarily services for Internet applications, and are less sensitive to transmission delays than interactive or streaming classes. Do. Therefore, when the interactive class and the background class apply the retransmission method, the transmission error can be minimized compared to the interactive class or the streaming class.

An example of an optimal QoS type and a minimum QoS type for each service that can be provided through a mobile communication terminal in a third generation mobile communication network as a traffic class is shown in Table 1 below.

Mobile service QoS type Optimal Minimum Acceptable PoC streaming 2-way Audio / Video Streaming streaming 2-way Browsing 2-way background Downloading background background File transferring 2-way background VoIP Interactive streaming Instant Messaging 2-way background E-mail background background … … …

In Table 1, PoC stands for Push to talk over Cellular, which means to provide instant messenger services such as walkie-talkie service to mobile phones. In comparison, it is possible to provide relatively fast communication service, and in case of radio service for group, it is a service that overcomes the limitation of one-to-one communication that phone has.

In addition, VoIP uses a packet network for data communication, which has been used in the past, for the Internet phone and is called Voice over Internet Protocol. A communication service that converts voice data into Internet protocol data packets to enable a call in a general telephone network.

Table 2 shows the QoS class of each traffic class. As shown in Table 2, the lower the QoS class, the smaller the transmission delay or the bit rate reduction.

QoS class Traffic class One Conversational 2 Streaming 3 Interactive 4 Background

Therefore, for example, in the preferred embodiment of the present invention, when the mobile communication terminal accesses the visited network and requests a streaming service of audio or video, the QoS value stored in the terminal is transmitted to the SGSN of the visited network. If both the VSGSN and the HGGSN can provide the requested QoS value, an appropriate QoS value may be set by defining a traffic class as a streaming class among various parameters of the QoS.

In addition, when the VSGSN cannot provide a QoS value of QoS class 2 corresponding to the streaming class with reference to Table 2, referring to Table 1, the minimum QoS class of the requested streaming service is a class 3 interactive class. According to the configuration of the communication terminal, it is possible to set an appropriate QoS value by lowering the traffic class to class 3 instead of class 2.

As described above, the network interworking system and the service providing method thereof according to the present invention have been described with reference to the illustrated drawings, but the present invention is not limited to the embodiments and drawings disclosed herein, and the mobile communication terminal is connected to the visited network. The technical idea of the present invention is to provide a good quality service while efficiently utilizing radio resources by setting a service quality level for providing the requested service between the SSGN of the visited network and the GGSN of the home network when requesting a service. Is readily applicable by those skilled in the art within the scope of the claims.

As described above, the network interworking system and its service providing method according to the present invention transmit and receive data between the SSGN of the visited network and the GGSN of the home network according to the requested service when the mobile communication terminal accesses the visited network and requests a service. By setting an appropriate quality of service level, the wireless network possessed by the visited network can be more efficiently utilized, and there is an advantage of providing a good quality service.

In addition, different charges may be imposed depending on the type of service used by the user of the terminal, thereby improving the reliability of the user's roaming service.

Claims (8)

Receiving a request message of a mobile communication service including a quality of service (QoS) value to be used from a mobile communication terminal connected to a visited network; Determining, by a Visited Serving GPRS Support Node (VSGSN) of the visited network, whether a service quality value of a service requested from the mobile communication terminal is a service quality value that can be provided; When the packet switched support node of the visited network cannot provide the quality of service value of the requested service, transmitting a downward adjustment query message including a service quality value to the mobile communication terminal; When the quality of service value corresponding to the downlink adjustment query message is set by the mobile communication terminal, establishing a wireless channel corresponding to the set quality of service value by the packet-switching support node of the visited network; And Providing a mobile communication service corresponding to the requested service to the mobile communication terminal through the formed wireless channel by a home gateway GPRS support node (HGGSN) of a home network; Service providing method of the interlocking system. The method of claim 1, The packet-switching support node of the visited network classifies the parameters of the serviceable service quality values of the mobile communication service by class and transmits the serviceable service quality values corresponding to the requested service by including them in the downlink adjustment query message. Service providing method of a network interworking system characterized in that. The method according to claim 1 or 2, If the mobile communication terminal does not perform the down adjustment corresponding to the down adjustment query message, the network interworking system service, characterized in that it further comprises the step of attempting to connect to any one of a number of pre-stored connectable network How to Provide. The method of claim 2, The parameter may include at least one of allocation / maintenance priority, traffic class, maximum SDU size, upward maximum bit rate, SDU error rate, traffic processing priority, and transmission delay. The method of claim 4, wherein In the case of a WCDMA network, the traffic class is classified into a class including a conversational class, a streaming class, an interactive class, and a background class. The service providing method of the network interworking system. Receiving a request message of a mobile communication service including a service quality value and adjustable setting data to be used from a mobile communication terminal connected to a visited network; Determining, by the packet-switching support node of the visited network, whether a service quality value of a service requested from the mobile communication terminal is a service quality value that can be provided; If the packet switched support node of the visited network is unable to provide a quality of service value of the requested service, establishing a wireless channel based on the adjustable configuration data; And And providing a mobile communication service corresponding to the requested service to the mobile communication terminal through the formed wireless channel by a packet gateway support node of a home network. A packet gateway support node (HGGSN) of a home network that transmits service data so that the requested service is provided according to a service quality value corresponding to the requested service, when the mobile communication terminal accesses the other network and requests a service; And Classify the service quality values that can be provided by class, determine whether a service quality value corresponding to the requested service is a service quality value, and if the service quality value corresponding to the requested service cannot be provided, move A packet exchange of a visited network for transmitting a message for downgrading the quality of service to a communication terminal, and forming a wireless channel according to the adjusted quality of service value to transmit the service data received from the HGGSN to the mobile communication terminal. Network interworking system comprising a support node (VSGSN). A mobile communication terminal which transmits a request message of a mobile communication service including a service quality value and adjustable setting data to access and use a visited network; It is determined whether the service quality value of the service requested from the mobile communication terminal is a service quality value that can be provided, and if a service quality value of the requested service cannot be provided, a wireless channel is formed based on the adjustable setting data. A packet switching support node of a visiting network; And And a packet gateway support node of a home network for providing the mobile communication terminal with a mobile communication service corresponding to the requested service through the formed wireless channel.

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