KR100703171B1 - Method and system for improving data receiving rate and managing excess of usage cap in wibro - Google Patents

Abstract

The present invention relates to a method and system for improving data call rate and managing an over-limit in a portable Internet.

The present invention provides a method of improving a data reception rate of a portable subscriber station (PSS) for handover between access control routers (ACRs) by managing a paging group, the method comprising: (a) a first ACR in which the PSS is included in the paging group; If the location registration in the step of, including the paging group to manage the location information of the PSS; (b) sending a paging message to the first ACR when a specific node requests an incoming of a data terminating service; (c) determining whether the PSS responds; (d) if there is no response from the PSS, sending the paging message to the paging group; And (e) receiving the response of the PSS in a second ACR.

According to the present invention, the location information management server manages the paging group in units of ACR, and sends a notification message to the ACR registered by the PSS when the data receiving service occurs or the PSS limit is exceeded, thereby notifying the paging group when the PSS does not respond. Since the message is retransmitted, there is an effect of preventing a case where a real-time call release is not performed when the packet data reception rate is lowered due to a handover of the PSS located at the boundary area between ACRs and a call failure due to the ping pong phenomenon between the ACRs and the limit is exceeded.

WiBro, PSS, Paging, ACR, Geolocation Server, Over Limit, Data Call Rate

Description

Method for Improving Data Receiving Rate and Managing Excess of Usage Cap in Wibro}

1 is a block diagram schematically illustrating a system for improving a data reception rate and managing a limit in a mobile Internet according to a preferred embodiment of the present invention;

FIG. 2A is a diagram illustrating a method of managing a location registered by a PSS in a first ACR in a location information server; FIG.

2b is a diagram illustrating a method of notifying data reception or exceeding a limit to a PSS handed over between ACRs by a location information management server;

3 is a flowchart illustrating a process of improving a data reception rate in a mobile Internet according to a preferred embodiment of the present invention.

4 is a flowchart illustrating a process of managing an excess of limits in a portable Internet according to a preferred embodiment of the present invention.

<Description of Symbols for Main Parts of Drawings>

100: PSS 110: RAS

120: ACR 130: AAA

140: HA 150: LMS

160: Charging Center 170: SCP

180: IP network 190: Internet

The present invention relates to a method and system for improving data call rate and managing an over-limit in a portable Internet. More specifically, the present invention relates to a method and system for improving data reception rate and limit management of a PSS (Portable Subscriber Station) performing handover between ACRs by managing a paging group by an ACR unit in a location information management server.

The mobile internet service uses various types of portable terminals such as laptops, PDAs, and handheld PCs to access various types of information and content by accessing the Internet in indoor and outdoor stationary environments and mobile environments at walking speeds and low to medium speeds. It is a service. In addition, IP-based wireless data system that provides mobility of 60 km / h per hour, provides downlink transmission speed of 24 Mbps, and can provide downlink transmission speed of 50 Mbps by applying Multiple Input Multiple Output (MIMO) system. to be.

In addition, the portable Internet system uses a 2.3 GHz frequency band, and draws a time division duplex (TDD) by a duplex method and a multiple access method to effectively use the allocated frequency spectrum. Orthogonal Frequency Division Multiple Access (OFDMA) is used for this purpose.

When the portable Internet system is put into practical use, the provision of data receiving services including data push, video call, push-to-talk (PTT), etc. and prepaid plans are expected to be activated.

Since the main purpose of the mobile Internet system is to provide Internet services to mobile mobile Internet subscribers, when the mobile Internet subscriber moves and the location of the PSS is changed, the PSS performs a location information update procedure to update its mobile internet system. Register location information. The portable Internet system stores the location information of the PSS according to the location information update procedure of the PSS, and provides the portable Internet service to the modified PSS accordingly.

Meanwhile, the mobile Internet system, like other mobile communication systems, calls the PSS to determine the state and location of the PSS. The procedure of calling the PSS is called paging. In a mobile Internet system, paging is performed by setting a predetermined area as a paging area and dividing a service area into a plurality of paging areas. These paging areas are sometimes referred to as paging groups. Currently, the management of paging groups is managed by Radio Access Station (RAS) in the access control router (ACR). In addition, the ACR implements a call disconnection function for subscribers exceeding the limit.

The ACR having paging group management and call disconnection function transmits the location information of the PSS to a location management server (LMS: LMS) when the PSS (Portable Subscriber Station) registers a location.

When the data receiving service occurs, the LMS sends a paging message to the ACR registered by the PSS, and when the ACR receiving the paging message pages the PSS located in the paging group of the RAS unit, the LMS sends the call response of the PSS to the LMS. Transmits the called route information including the identification factor of the ACR to a specific node for providing the data terminating service to the PSS 100, so that the PSS receives the data of the data terminating service.

When the limit of PSS using the wireless Internet is exceeded, the LMS sends a call disconnection message to the ACR where the PSS is registered, releases the call connection of the PSS from the ACR that receives the call disconnection message, and sends a call disconnection completion message. Send to LMS.

When performing paging when the data receiving service occurs and disconnecting the call when the PSS limit is exceeded, the LMS transmits a paging message and a call disconnection message to the ACR registered by the PSS as above, and the response is registered by the PSS. Receive from ACR.

However, if the PSS is located in the boundary area between ACRs and there is a handover between ACRs and a data-receiving service occurs or the PSS limit is exceeded, the LMS will not be able to update the PSS before the PSS location information is updated. Transmits a paging message or call disconnection message to the location-registered ACR.

At this time, when the location information of the PSS is updated in the LMS, that is, when the location information of the PSS is transmitted from the ACR registered by the PSS after the handover occurs between the ACRs and the handover time between the ACRs, the number of paging messages is transmitted. Due to the excess, there is a problem in that the data receiving service cannot be provided to the PSS, or the call release of the PSS exceeding the limit is delayed by an interval between the location information update time of the PSS and the handover time between the ACRs.

In order to solve the above-mentioned problems, the present invention provides a method of improving data reception rate and exceeding limit of a portable subscriber station (PSS) for handover between ACRs by managing a paging group in an ACR (Access Control Router) unit in a location information management server. And to provide a system.

In order to achieve the above object, the present invention provides a method of improving a data reception rate of a portable subscriber station (PSS) for handover between access control routers (ACRs) by managing a paging group. Managing location including the paging group in location information of the PSS when location registration is performed in a first ACR included in a group; (b) sending a paging message to the first ACR when a specific node requests an incoming of a data terminating service; (c) determining whether a call response of the PSS is determined; (d) if the paging message is not present at the PSS, sending the paging message to the paging group; And (e) receiving the call response of the PSS at a second ACR.

According to another object of the present invention, a method of releasing a call connection of the PSS when the limit of the portable subscriber station (PSS) for handover between ACR (Access Control Router) by managing a paging group, (a) If the PSS registers a location in the first ACR included in the paging group, managing the location including the paging group in the location information of the PSS; (b) when the PSS limit is exceeded, sending a call disconnection message to release the call connection of the PSS to the first ACR; (c) receiving a call disconnection completion message; (d) if the call disconnection complete message has not been received from the first ACR, sending the call disconnection message to the paging group; And (e) receiving the call disconnection completion message from a second ACR.

In addition, according to another object of the present invention, a portable terminal provided with a portable Internet service, a RAS (Radio Access Station) performing a base station function of the portable Internet system, and functions as a base station controller for controlling the RAS, a packet access router Access Control Router (ACR), AAA (Accounting, Authentication, Authorization) that provides authentication, authorization and charge calculation functions in mobile Internet resource access processing and service provision of mobile Internet subscribers, and the PSS in conjunction with the ACR In the system comprising a service control point (SCP) for performing a billing operation for the mobile Internet service provided by the service information, when the PSS registers the location in the ACR, the location information of the PSS transmitted from the ACR It includes a Location Management Server (LMS) that manages including a paging group containing ACR. It is provided by the incoming data rate and the improvement over limit management system in a mobile Internet.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. First of all, in adding reference numerals to the components of each drawing, it should be noted that the same reference numerals are used as much as possible even if displayed on different drawings. In addition, in describing the present invention, when it is determined that the detailed description of the related well-known configuration or function may obscure the gist of the present invention, the detailed description thereof will be omitted.

FIG. 1 is a block diagram schematically illustrating a system for improving a data reception rate and an over-limit management system in a portable Internet according to a preferred embodiment of the present invention.

In the mobile Internet according to a preferred embodiment of the present invention, the data reception rate improvement and limit management system may include a portable subscriber station (PSS) 100 and a radio access station (RAS) unit (hereinafter referred to as "RAS"). 110), access control router (ACR: Access Control Router, hereinafter referred to as 'ACR') 120, subscriber authentication server (AAA: Accounting, Authentication, Authorization, hereinafter referred to as 'AAA') 130, home agent (HA: Home Agent, hereinafter referred to as 'HA') (140), Location Management Server (LMS: Location Management Server, hereinafter referred to as 'LMS') 150, Billing Center 160, Limit Management Server (SCP: Service Control Point, hereinafter referred to as 'SCP' 170, IP network (Internet Protocol Network) 180, the Internet 190 and the like.

The PSS 100 refers to a portable terminal provided with a portable internet service from a portable internet network. The PSS 100 includes a low power radio frequency (RF) / IF (intermediate frequency) module, and includes a controller function, a variable control of a MAC (Media Access Control) frame according to a radio wave environment, a handover function, and authentication. And an encryption function. In addition, the PSS 100 is equipped with a browser for accessing the Internet for accessing the portable Internet network and using the portable Internet service.

Here, the PSS 100 may be a personal digital assistant (PDA), a handheld PC, a notebook PC, a smart phone, a multi-mode multi-band (MM-MB) terminal, or the like. In particular, a smart phone is a terminal that combines the advantages of a mobile communication terminal and a personal portable terminal, and includes a terminal that integrates data communication functions such as schedule management, fax transmission and Internet access, etc. it means. In addition, the multi-mode multi-band terminal has a multi-modem chip, and means a terminal that can operate not only in the mobile Internet system but also in other mobile communication systems, for example, CDMA 2000 system, WCDMA system.

In addition, the PSS 110 according to the preferred embodiment of the present invention is located at the boundary area between the ACRs 120, and the handover between the ACRs 120 during the paging attempt of the LMS 150 or the prepaid fee during the use of the mobile Internet. At the same time the handover between the ACR 120 is exceeded.

As a base station of the RAS 110 mobile Internet system, the packet data received from the ACR 120 is wirelessly transmitted to the PSS 100, and the controller function, orthogonal frequency division multiple access (OFDMA) / time division duplex (TDD) packet Scheduling and channel multiplexing function, MAC frame variable control function according to service characteristics and propagation environment, 50 Mbps high speed traffic real time control function, handover function and so on. In addition, the PSS 100 and the RAS 110 include a 50 Mbps packet transmission modulation and demodulation function, a high speed packet channel coding function, a real time modem control function, and the like for data transmission.

The ACR 120 is a base station controller of a portable Internet system, and receives a plurality of RAS 110 and handovers between the RAS 110 or a RAS 110 as a packet access router connecting the RAS 110 and a packet service network. A control function, a handover function between the ACR 120, a handover function between a base station of another network (for example, a CDMA 2000 network, a WCDMA network, etc.) and the RAS 110, a packet routing function, and an Internet access function are performed.

In FIG. 1, only one ACR 120 is shown connected to the IP network 180, but in practice, a plurality of ACRs up to the Nth ACR (not shown) may be connected through the IP network 180, and each ACR may be connected. That is, the ACR 120 to the N-th ACR (not shown) are each connected to a plurality of RASs to control the plurality of RASs.

In the present invention, the ACR 120 transmits the location information of the PSS 100 that has registered the location to the LMS 150, and performs paging when the paging message is received from the LMS 150. When the PSS 100 receives the call response, it transmits the call response of the PSS 100 to the LMS 150. In addition, when the call disconnection message is received from the LMS 150, the call disconnection of the PSS 100 is performed. If the call disconnection of the PSS 100 is completed, the call disconnection completion message is transmitted to the LMS 150. do.

The AAA 130 is a server that provides authentication, authorization and fee calculation functions in the mobile Internet resource access processing and service provision of the mobile Internet subscriber, and interoperates with a database having subscriber information through the IP network 180.

If the PSS 100 is using the prepaid rate plan, the AAA 130 distinguishes that the subscriber is a prepaid fee at the time of authentication of the subscriber, including a prepaid rate limit management indication that can identify the prepaid fee subscriber in the subscriber information.

When using the mobile IP in the mobile Internet network, the HA 140 refers to software that performs a function of routing a packet transmitted from the outside through the Internet 180 and hardware coupled thereto.

The LMS 150 refers to software that manages the subscriber's status information and location information and hardware associated with it. When the LMS 150 provides an incoming service to the PSS 100 from a specific node (for example, a switch connected to a mobile Internet network or a mobile communication network, an application server connected to the Internet, etc.), the location information of the PSS 100 is provided. Search for and send it to the ACR (120). In addition, the LMS 150 stores and manages subscriber status information, subscriber location information, subscriber service information, and the like.

In addition, the LMS 150 according to the present invention manages a paging group by ACR unit, that is, manages a neighboring ACR as one paging group. Here, the number of neighboring ACR constituting one paging group is arbitrarily set by the mobile communication company.

When the PSS 100 registers a location in a specific ACR, the LMS 150 includes a paging group including a specific ACR in location information of the PSS 100 transmitted by the specific ACR. In addition, when an incoming data service including data push, video call, push to talk (PTT), etc. occurs, the LMS 150 transmits a paging message to a specific ACR. If the call response is not received, the paging message is sent second to the paging group. On the other hand, when the limit of the PSS 100 using the mobile Internet on the prepaid rate is exceeded, the LMS 150 first transmits a call disconnection message to a specific ACR, and if a call termination completion message is not received at a specific ACR, Secondly, the call disconnection message is sent to the paging group.

When an incoming data service including any of data push, video call, push to talk (PTT), etc. occurs, a paging attempt performed by the LMS 150 and a call performed by the LMS 150 when the limit of the PSS 100 is exceeded. A detailed description of the connection release message transmission will be given with reference to FIGS. 2A and 2B.

The charging center 160 calculates and charges the amount of use according to the amount of data used by the PSS 100 subscribed to the mobile Internet service.

The SCP 170 works with the ACR 120 to settle billing for the portable Internet service provided to the PSS 100, and generates an EAP master key to mutually interact with the PSS 100 and the portable Internet network 130. It refers to software for controlling the connection between the hardware and hardware associated with it. In addition, the SCP 170 transmits a call disconnection message to the ACR 120 in conjunction with the LMS 150 when the prepaid rate limit of the PSS 100 is exceeded.

The IP network 180 is a backbone network for transmitting and receiving data in the portable Internet network, and includes a plurality of network equipment such as a router. In addition, the ACR 120, AAA 130, HA 140 and LMS 150 is connected to each other, and receives packet data from an external packet data service such as the Internet 160 and transmits it to the ACR 120. .

2A is a diagram illustrating a method of managing a location registered by a PSS in a first ACR in a location information server.

When the PSS 100 registers a location at the first ACR 212, the LMS 150 is a first paging group including the first ACR 212 in the location information of the PSS 100 received at the first ACR 212. Paging group 210, including the management. For example, when the PSS 100 registers the location of the first ACR 212, the LMS 150 may display "PSS A: NAI: A, MAC Address: B, IP Address: 192.168.2.1, ACR: # 1, Paging Group". The location information of the PSS 100 is managed as shown in FIG. Here, "# 1" of "ACR: # 1" is an identification factor of the ACR 120, "ACR: # 1" means the first ACR 212, and "Paging Group: # 1" is the first paging. Group 210 means.

The LMS 150 transmits a paging message or call disconnection message to the first ACR included in the first paging group when a data incoming service occurs or when the limit of the PSS 100 is exceeded.

FIG. 2B is a diagram illustrating a method of notifying data reception or exceeding a limit of a PSS handovered between ACRs by a location information management server.

If the data receiving service occurs when the PSS 100 registered in the first ACR 212 moves to the second ACR 214 included in the first paging group 210, the LMS 150 transmits a paging message to the PSS 100. A first paging attempt is made by transmitting to the first ACR 212 included in the location information of 100. At this time, the LMS 150 has not received the location information of the PSS 100 from the second ACR 214.

If the call response is not received from the first ACR 212 in the first paging attempt, the LMS 150 may include the first ACR 212 included in the first paging group 210 included in the location information of the PSS 100. The paging message is sent to the second ACR 214 and the third ACR 216. Among the first ACR 212, the second ACR 214, and the third ACR 216 that have received the paging message, the second ACR 214 handed over by the PSS 100 sends the call response of the PSS 100 to the LMS. And the LMS 150 transmits the called route information including the identification factor of the second ACR 214 to a specific node providing the data terminating service so that the PSS 100 transmits the second ACR 214. Receive data from the data receiving service.

On the other hand, when the PSS 100 using the mobile Internet for the prepaid rate is handed over to the second ACR 214 included in the first paging group 210, when the limit of the PSS 100 is exceeded, the LMS 150 The call connection release message is first transmitted to the first ACR 212 included in the location information of the PSS 100. At this time, the LMS 150 has not received the location information of the PSS 100 from the second ACR 214.

If the call disconnection complete message is not received from the first ACR 212 in the primary transmission, the LMS 150 includes the first ACR 212 included in the first paging group 210 included in the location information of the PSS 100. ), And transmits a call disconnection message to the second ACR 214 and the third ACR 216. The second ACR 214 handed over by the PSS 100 among the first ACR 212, the second ACR 214, and the third ACR 216 that has received the call disconnection message is connected to the call of the PSS 100. And releases the call disconnection completion message to the LMS 150.

3 is a flowchart illustrating a process of improving a data reception rate in a mobile Internet according to a preferred embodiment of the present invention.

When the PSS 100 registers a location at the first ACR 212, the LMS 150 is a first paging group including the first ACR 212 in the location information of the PSS 100 received at the first ACR 212. The management includes the paging group 210 (S310).

When the PSS 100 requests data incoming service including a data push service, a video call, a push to talk (PTT), etc. designated as a receiving terminal and requests a data incoming service from a specific node, the LMS 150 sends a paging message. The first paging attempt is transmitted by transmitting to the first ACR 212 included in the location information of the PSS 100 (S320).

Upon receiving the call response of the PSS 100 from the first ACR 212 in the first paging attempt, the LMS 150 transmits the called path information including the identification factor of the first ACR 212 to the specific node to send the PSS ( 100) R causes the first ACR 212 to receive data of the incoming data service (S330 and S340).

If the call response is not received from the first ACR 212 in the first paging attempt, the LMS 150 may include the first ACR 212 included in the first paging group 210 included in the location information of the PSS 100. The paging message is transmitted to the second ACR 214 and the third ACR 216 (S350).

Among the first ACR 212, the second ACR 214, and the third ACR 216 that have received the paging message, the second ACR 214 handed over by the PSS 100 sends the call response of the PSS 100 to the LMS. And the LMS 150 transmits the called route information including the identification factor of the second ACR 214 to a specific node providing the data terminating service so that the PSS 100 transmits the second ACR 214. Through the data receiving service data to be received through (S360, S370).

The method is performed when the data terminating service occurs when the PSS 100 registered in the first ACR 212 hands over to the second ACR 214 included in the first paging group 210. At this time, the LMS 150 has not received the location information of the PSS 100 from the second ACR 214.

4 is a flowchart illustrating a process of managing an excess of limits in a portable Internet according to a preferred embodiment of the present invention.

When the PSS 100 registers a location at the first ACR 212, the LMS 150 is a first paging group including the first ACR 212 in the location information of the PSS 100 received at the first ACR 212. The management includes the paging group 210 (S410).

When the limit of the PSS 100 using the portable Internet is exceeded, the LMS 150 first transmits a call connection release message to the first ACR 212 included in the location information of the PSS 100 (S420).

Upon receiving the call disconnection completion message from the first ACR 212 in the primary transmission, the LMS 150 ends the process (S430). If the call disconnection complete message is not received from the first ACR 212 in the primary transmission, the LMS 150 includes the first ACR 212 included in the first paging group 210 included in the location information of the PSS 100. ), And transmits a call connection release message to the second ACR 214 and the third ACR 216 (S440). The second ACR 214 handed over by the PSS 100 among the first ACR 212, the second ACR 214, and the third ACR 216 that has received the call disconnection message is connected to the call of the PSS 100. Release and transmits a call disconnection complete message to the LMS 150 (S450).

The method is performed when the PSS 100 using the mobile Internet as a prepaid plan exceeds the limit of the PSS 100 upon handover to the second ACR 214 included in the first paging group 210. At this time, the LMS 150 has not received the location information of the PSS 100 from the second ACR 214.

The above description is merely illustrative of the technical idea of the present invention, and those skilled in the art to which the present invention pertains may make various modifications and changes without departing from the essential characteristics of the present invention. Therefore, the embodiments disclosed in the present invention are not intended to limit the technical idea of the present invention but to describe the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments. The protection scope of the present invention should be interpreted by the following claims, and all technical ideas within the equivalent scope should be interpreted as being included in the scope of the present invention.

As described above, according to the present invention, the location information management server manages the paging group in units of ACR, and the PSS does not respond by first sending a notification message to the ACR registered by the PSS when a data incoming service occurs or the PSS limit is exceeded. Since the notification message is re-transmitted to the paging group at the time, it prevents the packet data reception rate decrease due to the handover of the PSS located in the ACR boundary region and the call failure due to the ping pong phenomenon between the ACRs and the real-time call release when the limit is exceeded. It works.

Claims (15)

What is claimed is: 1. A method of improving data coverage of a portable subscriber station (PSS) that performs handover between access control routers (ACRs) by managing a paging group. (a) if the PSS registers a location in a first ACR included in the paging group, managing the location including the paging group in the location information of the PSS; (b) sending a paging message to the first ACR when a specific node requests an incoming of a data terminating service; (c) determining whether a call response of the PSS is determined; (d) if the paging message is not present at the PSS, sending the paging message to the paging group; And (e) receiving the call response of the PSS at a second ACR Method of improving data reception rate in the mobile Internet, comprising a. The method of claim 1, wherein in step (a) And at least one ACR in the paging group according to a setting value arbitrarily set by a mobile communication company operating the portable Internet. The method of claim 1, wherein in step (b) And transmitting the paging message to the first ACR when the PSS registered in the first ACR hands over to the second ACR. The method of claim 3, wherein And a status of a location management server (LMS) is a state in which the location information is not received from the second ACR. The method of claim 1, wherein in step (e) And the second ACR is the ACR included in the paging group. The method of claim 1 wherein the method is (f) transmitting the called path information including the identification factor of the second ACR to the specific node; Method of improving data reception rate in the mobile Internet, characterized in that it further comprises. A method of managing a paging group to release a call connection of the PSS when a limit of a portable subscriber station (PSS) for handover between access control routers (ACRs) is exceeded. (a) if the PSS registers a location in a first ACR included in the paging group, managing the location including the paging group in the location information of the PSS; (b) when the PSS limit is exceeded, sending a call disconnection message to release the call connection of the PSS to the first ACR; (c) receiving a call disconnection completion message; (d) if the call disconnection complete message has not been received from the first ACR, sending the call disconnection message to the paging group; And and (e) receiving the call disconnection completion message from a second ACR. 8. The method of claim 7, wherein in step (a) And the at least one ACR is included in the paging group according to a setting value arbitrarily set by a mobile communication company operating the portable internet. 8. The method of claim 7, wherein in step (b) The mobile Internet, when the PSS using the mobile Internet on a prepaid plan handover from the first ACR to the second ACR when the limit of the PSS is exceeded, the mobile Internet access message to the first ACR characterized in that How to manage over limit. The method of claim 9, And a status of a location management server (LMS) is that the location information is not received from the second ACR. 8. The method of claim 7, wherein in step (e) And wherein the second ACR is the ACR included in the paging group. Portable Subscriber Station (PSS) receiving a mobile Internet service, a Radio Access Station (RAS) performing a base station function of a mobile Internet system, a base station controller controlling the RAS, and an ACR (Access) functioning as a packet access router. Control Router), AAA (Accounting, Authentication, Authorization) which provides authentication, authorization and charge calculation functions in mobile Internet resource access processing and service provision of mobile Internet subscriber and the mobile Internet service provided to the PSS in conjunction with the ACR In a system comprising a Service Control Point (SCP) that performs the operation of billing for Location Management Server (LMS) that manages the PSS including a paging group including the ACR in the location information of the PSS transmitted from the ACR when the location is registered in the ACR. Data reception rate improvement and limit management system in the portable Internet comprising a. The method of claim 12, And the LMS includes at least one ACR in the paging group. The method of claim 12, When the incoming data service including any one of data push, video call, and push to talk (PTT) occurs, the LMS first transmits a paging message to the ACR, and fails to receive a call response of the PSS in the ACR. And a second data transmission to the paging group. 2. The method of claim 12, The LMS first transmits a call disconnection message to the ACR when the limit of the PSS using the mobile Internet service on a prepaid rate is exceeded, and disconnects the call disconnection completion message from the ACR. And a second data transmission to the paging group.

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