KR20060026741A - Method and system for transmitting packet data at packet controller boundary - Google Patents

Abstract

The present invention relates to a method and system for transmitting packet data at a boundary of a service providing area of a packet controller of a mobile communication network.

The present invention provides a method for transmitting packet data to a mobile communication terminal in a mobile communication network including a mobile communication terminal, a first access network, a second access network, a first packet controller, a second packet controller, and a PDSN. Receiving a handoff request signal from a communication terminal; (b) establishing a link with the second access network; (c) determining whether to maintain a link establishment with the first access network using the 'PDSN parameter'; (d) transmitting packet data to the first access network and the second access network when maintaining the link establishment with the first access network as a result of the determination of step (c); And (e) if the determination result of step (c) does not maintain the link establishment with the first access network, transmitting the packet data to the second access network. Provide a data transmission method.

According to the present invention, when the mobile communication terminal is located at the 'packet controller boundary', the incoming call success rate can be improved and the quality of the mobile communication service can be improved.

Packet Controller, Boundary Area, Packet Data, Timer, PCF, Packet Data, Timer

Description

Method and System for Transmitting Packet Data at Packet Controller Boundary

1 is a block diagram schematically illustrating a system for transmitting packet data at a boundary of a service providing area of a packet controller according to a first embodiment of the present invention;

2 is a flowchart illustrating a method of transmitting packet data at a boundary of a service providing area of a packet controller according to a first embodiment of the present invention;

3 is a block diagram schematically illustrating a system for transmitting packet data at a boundary of a service providing area of a packet controller according to a second embodiment of the present invention;

4 is a flowchart illustrating a method of transmitting packet data at a boundary of a service providing area of a packet controller according to a second embodiment of the present invention.

<Description of Symbols for Main Parts of Drawings>

110: mobile communication terminal 120, 320: first access network

130, 330: second access network 140: first packet controller

150: second packet controller 170: PDSN

180: router 182: HA

184: AAA 190: Internet

The present invention relates to a method and system for transmitting packet data at a boundary of a service providing area of a packet controller of a mobile communication network. More specifically, when the mobile communication terminal is located at the boundary of the service providing area of the packet control function including a plurality of access networks and continuously changes the location to different areas, the mobile A packet data serving node (PDSN) and an access network so that a communication terminal can receive a mobile communication service using an access network in a service providing area of all packet controllers in the vicinity. It relates to a method and a system for controlling it.

Recently, with the development of computer and communication technology, various wireless communication services are provided using a wireless communication network. The most basic wireless communication service is a wireless voice call service that provides a voice call to a mobile terminal user wirelessly, which can provide a service regardless of time and place. In addition, while providing a text message service to complement the voice call service, a wireless Internet service has recently emerged to provide an Internet communication service to a user of a mobile communication terminal through a wireless communication network.

In order to provide such a service, the mobile communication system has been developed through a first generation analog AMPS (Advanced Mobile Phone System) system and a second generation cellular / personal communication service (PCS) system. In recent years, IMT-2000 (International Mobile Telecommunication 2000), a third generation mobile communication system established by ITU-R as a standard, is commercially available.

The IMT-2000 is, for example, CDMA 2000 1x, CDMA 2000 EV-DO, WCDMA, etc., which can service data communication at a higher speed than the data rates supported by existing IS-95A, IS-95B, and IS-95C networks. System. In particular, using the IMT-2000 system, it is possible to provide various multimedia services at a higher speed as well as to improve the quality of services using existing voice communication services and WAP (Wireless Application Protocol).

Here, the CDMA 2000 system is a mobile communication system synchronously implemented in the IMT-2000 system, and is divided into 1x and 3x according to the number of FAs used as carriers. In addition, there are various technology schemes such as 1x EV-DO and 1x EV-DV according to the evolutionary contents. Accordingly, the CDMA 2000 system can be classified into a CDMA 2000 1x, a CDMA 2000 EV-DO (or EV-DV), and a CDMA 2000 3x system according to the number and evolution of FAs. As such, the CDMA 2000 system is a concept encompassing a system implemented by various technical methods.

CDMA 2000 1x provides voice and data services to mobile subscribers. The voice service can accommodate about twice as many subscribers as the IS-95A / B system, which is a synchronous mobile communication system, and the data service is about 153.6 Kbps compared to the IS-95B. It's 2.3 times better, which allows for the acceptance of most applications except moving images.

In comparison, the CDMA 2000 EV-DO system provides only data services and can transmit data at speeds up to 2.4 Mbps in the forward direction. In addition, subscriber capacity is improved by more than five times over CDMA 2000 1x systems. The CDMA 2000 EV-DV system can support voice and data in one carrier, and the data transfer rate is up to 5.2 Mbps, more than double the CDMA 2000 1x EV-DO.

In addition, the WCDMA system is a mobile communication system asynchronously implemented in the IMT-2000 system, the wireless access method for communication between the base station and the mobile terminal uses the CDMA method, but the mobile communication network related technology GSM (Global System for Mobile Communication) Based on network technology. The WCDMA method does not need to use Global Positioning System (GPS) to synchronize the entire base station, supports international roaming service, widens the frequency bandwidth to 5 MHz, and has a data transmission rate of 2 Mbps, which is suitable for high-speed data transmission. Do.

In addition, the WCDMA system provides diversity in accordance with reverse call quality, which is not available in the conventional IS-95 and GSM methods, so that call and data transmission performance is relatively good even in a poor communication environment. However, since the WCDMA method does not support backward compatibility with the existing CDMA and GSM methods, a new mobile communication network must be established and a mobile communication terminal supporting the WCDMA method should be used.

Recently, various services such as push-to-talk (PTT) service, in which a mobile communication terminal continuously receives packet data, have been provided using such a mobile communication system, and efforts to satisfy various needs of mobile subscribers continue. have.                         

In order for the mobile communication terminal to receive packet data, the connection state by PDSN and Point-to-Point Protocol (PPP) must be maintained even in an idle state. As described above, the mobile communication terminal releases the physical communication channel with the access network, but maintains the link using PDSN and PPP to receive packet data. In addition, when the mobile communication terminal moves from the service providing area of one packet controller to the service providing area of another packet controller, Dormant Handoff is performed.

On the other hand, in the conventional mobile communication terminal to receive the packet data, since the packet controller is connected to the PDSN through a 1: 1 RP interface, the area where the mobile communication terminal can receive the packet data is the service of the packet controller. It is confined within a provisioning area or a smaller sub area (service area of an access network). Therefore, if the mobile communication terminal is located at the boundary of the service providing area of the packet controller and changes its location to different areas frequently, there is a possibility that the failure rate of packet data reception may increase due to frequent area changes, thereby causing the mobile communication. Dissatisfaction with the quality of the subscriber may be caused.

In order to solve this problem, the present invention, when the mobile communication terminal is located on the boundary of the service providing area of the packet controller including a plurality of access networks to continuously change the location to different areas, the mobile communication terminal is peripheral Provided are a method and a system for controlling a PDSN and an access network so that a mobile communication service can be provided using an access network included in a service provisioning area of all packet controllers.

In order to achieve the above object, according to the first object of the present invention, a mobile communication terminal, a first access network (Access network), a second access network, a first packet controller (Packet Control Function), a second packet controller, PDSN ( Transmitting a packet data to the mobile communication terminal when the mobile communication terminal moves from a service providing area of the first packet controller to a service providing area of the second packet controller in a mobile communication network including a Packet Data Serving Node; A method comprising: (a) receiving a hand off request signal from the mobile communication terminal; (b) establishing a link with the second access network; (c) determining whether to maintain a link establishment with the first access network by using a 'PDSN parameter' including a 'PDSN timer' and a 'number of packet controllers'; (d) transmitting packet data to the first access network and the second access network when maintaining the link establishment with the first access network as a result of the step (c); And (e) transmitting packet data to the second access network if the link setting with the first access network is not maintained as a result of the determination of step (c). It provides a packet data transmission method in.

In addition, according to a second object of the present invention, in a mobile communication network providing a mobile communication service to a mobile communication terminal, the mobile communication terminal is located at a boundary of a service providing area of a packet controller to change the position from time to time to hand off. a system for transmitting packet data to the mobile communication terminal in the case of off), and when a mobile communication terminal is located at the boundary, a forward link page message is transmitted to the mobile communication terminal. A first access network transmitting the packet data to a mobile communication terminal; A second access network transmitting the forward link call message to the mobile communication terminal to transmit the packet data to the mobile communication terminal; It is determined whether to maintain a link establishment with the first access network by using a 'PDSN parameter' including a 'Packet Data Serving Node (PDSN) timer' and a 'number of packet controllers'. A PDSN for transmitting packet data to the second access network; A first packet control function connecting the first access network and the PDSN; And a second packet controller connecting the second access network and the PDSN.

According to a third object of the present invention, there is provided a mobile communication terminal, a first access network, a second access network, a first packet control function, a second packet controller, and a packet data serving node. A method of transmitting packet data to a mobile communication terminal when the mobile communication terminal moves from a service providing area of the first packet controller to a service providing area of the second packet controller in a mobile communication network including: a) receiving a hand off request signal from the mobile communication terminal; (b) establishing a link with the PDSN; (c) determining whether to delete a PANID received from the mobile communication terminal using an access network timer; (d) If it is determined in step (c) that the PANID is not deleted, a forward link page massage is transmitted to the mobile communication terminal, and the mobile communication is performed to the second access network. Transmitting information about a terminal to cause the second access network to transmit a forward link call message to the mobile communication terminal; And (e) if the PANID is deleted as a result of the determination of step (c), transmitting the forward link call message to the mobile communication terminal. Provide a method.

In addition, according to a fourth object of the present invention, in a mobile communication network providing a mobile communication service to a mobile communication terminal, the mobile communication terminal is located at a boundary of a service providing area of a packet controller and changes the position from time to time to hand off. off) is a system for transmitting packet data to the mobile communication terminal in a case where a forward link page message is transmitted to the mobile communication terminal when the mobile communication terminal is located at the boundary. A first access network transmitting the packet data to a mobile communication terminal; A second access network that determines whether to delete a PANID received from the mobile communication terminal using an 'access network parameter' and transmits information about the mobile communication terminal to the first access network; Packet data serving node (PDSN) which transmits the packet data to the first access network and / or the second access network and relays information about the mobile communication terminal transmitted from the second access network to the first access network. ); A first packet control function connecting the first access network and the PDSN; And a second packet controller connecting the second access network and the PDSN.

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

In addition, hereinafter, a method and a system for transmitting packet data at a service providing area boundary of a packet controller according to the present invention will be described according to the first embodiment and the second embodiment according to the subject performing the present invention.

Here, the first embodiment relates to a method and system for transmitting packet data by determining whether a PDSN is located at a boundary of a service providing area of a packet controller in a Code Division Multiple Access (CDMA) 2000 1x system. . The second embodiment relates to a method and a system for transmitting packet data by determining whether an access network is located at a boundary of a service providing area of a packet controller in an access network in a CDMA 2000 1x system. However, the CDMA 2000 1x system is a system designated for convenience of describing the present invention, and the present invention is not limited to the CDMA 2000 1x system, but the packet is a CDMA 2000 1x EV-DO system, a WCDMA system, and the like. Applied in various mobile communication systems that provide mobile communication services including data.

In addition, hereinafter, the mobile communication terminal receiving the packet data in the service providing area of the first packet controller moves to the service providing area of the second packet controller in the service providing area of the first packet controller and the service of the second packet controller. An embodiment of the present invention will be described under the assumption that it is located at the boundary of the provisioning area and handoffs from the first access network included in the first packet controller to the second access network included in the second packet controller.

1 is a block diagram schematically illustrating a system for transmitting packet data at a boundary of a service providing area of a packet controller according to a first embodiment of the present invention.

The system for transmitting packet data at the boundary of the service providing area of the packet controller according to the first embodiment of the present invention is a mobile communication terminal 110, a first access network 120, a second access network 130, a first Packet Controller 140, Second Packet Controller 150, PDSN 170, Router 180, Home Agent (HA) 182, Authentication, Authorization, Accounting (AAA) 184, Internet 190 Include.

The mobile communication terminal 110 receives a mobile communication service including packet data through the PDSN 170 using the access networks 120 and 130. In addition, the mobile communication terminal 110 according to the first embodiment of the present invention moves a dormant handoff while moving between the service providing area 162 of the first packet controller and the service providing area 164 of the second packet controller. Dormant Hand off) and at the boundary between the service providing area 162 of the first packet controller and the service providing area 164 of the second packet controller (hereinafter referred to as a 'packet controller boundary'), a first access network ( A forward link page message is received from both the 120 and the second access network 130 to selectively receive packet data from the first access network 120 or the second access network 130.

Here, the mobile communication terminal 110 is a PDA (Personal Digital Assistant), cellular phone, PCS (Personal Communication Service) phone, Hand-Held PC (Global System for Mobile) GSM, WCDMA (Wideband CDMA) ) Phones, CDMA-2000 phones, MBS (Mobile Broadband System) phones and the like. Here, MBS phone refers to a mobile phone to be used in the fourth generation system currently being discussed.

The first access network 120 and the second access network 130 may include a base station transmission system (BTS) 122 and 132, a base station controller (BSC) 124 and 134, and a repeater. (Cell Enhancer: not shown). Here, the base station transmitters 124 and 134 are arranged in units of cells and perform location registration for locating the position of the mobile communication terminal 110 existing in the cell area under their control, and perform voice registration to the mobile communication terminal. And assign a radio channel for data communication. In addition, the base station controllers 124 and 134 perform various functions required for radio call processing such as handoff while controlling and managing a plurality of base stations. In addition, the base station controllers 124 and 134 are connected to the first packet controller 140 and the second packet controller 150, respectively, to wirelessly connect the mobile communication terminal 110 and the PDSN 170.

The first access network 120 and the second access network 130 according to the first embodiment of the present invention, when the mobile communication terminal 110 is located at the 'packet controller boundary', the packet data from the PDSN (170) Receive and transmit a forward link call message to the mobile communication terminal (110).

The first packet controller 140 and the second packet controller 150 connect the PDSN 170 with each of the first access network 120 and the second access network 130 to establish a connection with the PDSN 170. / Maintenance / release, and requesting each of the first access network 120 and the second access network 130 to allocate a radio resource for packet data transmission, collect billing information, and collect PDSN ( 170). In addition, the buffering function and the mobile communication terminal 110 until the packet data received from the PDSN 170 is transmitted to the mobile communication terminal 110 through the first access network 120 and the second access network 130, respectively. Perform state management functions.

The PDSN 170 is connected to the first access network 120 and the first packet controller 140 or the second access network 130 and the second packet controller 150 based on TCP / IP, and thus the mobile communication terminal 110. Send and receive various data. The PDSN 170 provides a mobile management function when the mobile subscriber receives data while moving, so that the mobile mobile terminal 110 continues to receive the Internet data service. Also, when the mobile communication terminal 110 moves to another cell, the mobile communication terminal 110 manages the mobile communication terminal 110 entering its area and informs the HA 182 of the current location.                     

The PDSN 170 according to the first embodiment of the present invention sets and stores a parameter (hereinafter, referred to as a 'PDSN parameter') for identifying whether the mobile communication terminal 110 is located at a 'packet controller boundary'. . The PDSN 170 according to the first embodiment of the present invention uses the 'PDSN parameter' when the mobile communication terminal 110 is located at a 'packet controller boundary'. Packet data is sent to 130 and each access network sends a forward link call message to the mobile communication terminal 110.

In the present invention, the 'PDSN parameter' includes a 'PDSN timer' and a 'packet controller number'. 'PDSN timer' means that the mobile communication terminal 110 moves from the service providing area 162 of the first packet controller to the service providing area 164 of the second packet controller and thus from the first access network 120 to the second access network. When handing off to 130, it is a timer that the PDSN 170 activates to release the link with the first access network 120. When the PDSN 170 receives a signal for requesting handoff from the second access network 130, the PDSN 170 operates the PDSN timer. 'PDSN timer' can be set arbitrarily by the operator who operates the system.

For example, assuming that the 'PDSN timer' is set to 5 minutes, the PDSN 170 maintains a link with the first access network 120 after receiving a signal requesting a handoff from the second access network. Activate the 'PDSN timer'. The PDSN 170 releases the link with the first access network 120 when it is determined that 5 minutes have elapsed and the set time of the 'PDSN timer' has expired. . If the mobile communication terminal 110 moves from the service providing area 164 of the second packet controller to the service providing area 162 of the first packet controller within 5 minutes of the set time, the PDSN timer is initialized.

In addition, the 'number of packet controllers' refers to an access network in which the PDSN 170 maintains a link when the mobile communication terminal 110 continuously moves to the 'packet controller boundary' before the set time of the aforementioned 'PDSN timer' expires. The maximum number of packet controllers including a. In FIG. 1, for convenience of description, the first packet controller 140 is connected to the first access network 120 and the second packet controller 150 is connected to the second access network 130. There may be third, fourth, and fifth packet controllers (not shown) connected to a fifth access network (not shown), and the number may vary.

Therefore, it is assumed that the mobile communication terminal 110 sequentially moves to the service providing areas of the first, second, and third packet controllers within the set time of the 'PDSN timer', and the 'number of packet controllers' is set to '2'. Then, the PDSN 170 is connected to the third and second packet controllers until the 'PDSN timer' expires and maintains a link with the third and second access networks handed off by the mobile communication terminal 110. When the set time of the 'PDSN timer' expires, the PDSN 170 releases the link with the second access network where the link is maintained and maintains the link only with the third access network.

The router 180 connects the PDSN 170, the HA 182, the AAA 184, and the Internet 190 to relay data or messages transmitted and received between each component.

The HA 182 serves to track and manage the location of the mobile communication terminal 110 together with the PDSN 170. When the mobile communication terminal 110 accesses for packet data service, the HA 182 assigns a unique identification IP address to the mobile communication terminal 110. This address is fixed because the Internet 190 is the only address that can identify the mobile communication terminal 110, it is used as an address to enable communication with the mobile communication terminal (110). When the mobile communication terminal 110 moves to another cell, a temporary IP address is given from the PDSN 170. This temporary IP address indicates the location where the mobile communication terminal 110 is located. Since the PDSN 150 and the HA 182 track and manage the position of the mobile communication terminal 110 by exchanging a fixed IP address and a temporary IP address of the mobile communication terminal 110, the mobile communication terminal 110 moves. Regardless of your location, you can always access your data.

AAA 184 is a function for identifying the state of the bandwidth, service, etc. of the mobile communication terminal 110 to authenticate, the function of encrypting the packet data using an encryption key (transmitting and receiving) through the Internet 190, encryption A level management function and a data collection function necessary for charging and settlement of the mobile communication terminal 110 are performed.

The Internet 190 is a communication network that provides a connection path for the mobile communication terminal 110 to transmit and receive data from the outside. It may be an internal intranet network interworking with a mobile communication network, and may be a publicly used internet.

2 is a flowchart illustrating a method of transmitting packet data at a boundary of a service providing area of a packet controller according to a first embodiment of the present invention.

When the mobile communication terminal 110 moves from the service providing area 162 of the first packet controller to the service providing area 164 of the second packet controller, the first access network 120 of the first packet controller 140 is moved. From the second access network 130 of the second packet controller 150. That is, the mobile communication terminal requests a handoff handoff to the PDSN 170 through the second access network 130.

The PDSN 170 receives a signal for requesting doment handoff from the second access network 130 and activates the 'PDSN timer' (S210). The PDSN 170 that operates the 'PDSN timer' establishes a link with the second access network 130 (S220). The PDSN 170 that establishes the link with the second access network 130 compares the number of packet controllers connected with the access network on which the current link is maintained with the set 'number of packet controllers' (S230).

As a result of the determination of step S230, the PDSN 170 proceeds to step S260 when the number of packet controllers connected to the access network on which the current link is maintained exceeds the set number of packet controllers. Release the link.

As a result of the determination in step S230, the PDSN 170 does not release the link with the first access network 120 when the number of packet controllers connected to the access network on which the current link is maintained is less than or equal to the set number of packet controllers. Keep without (S240).

The reason for maintaining the link with the first access network 120 without releasing as in step S240 is that the 'PDSN timer' operated in step S210 has not expired, so the mobile communication terminal 110 is located at the 'packet controller boundary'. This is because it is likely to be located.

Accordingly, in order to reliably transmit packet data to the mobile communication terminal 110 at the 'packet controller boundary', the PDSN 170 needs to access all the access networks in which the current link is formed when there is packet data to transmit to the mobile communication terminal 110. (Packet data is transmitted to the first access network 120 and the second access network 130). All access networks (first access network 120 and second access network 130) that have received packet data from PDSN 170 cause the mobile terminal 110 to transmit a forward link call message.

The mobile communication terminal 110 receiving the forward link call message transmits the greatest signal strength by comparing the strengths of the signals received from all the access networks (the first access network 120 and the second access network 130). An access network is selected to receive packet data. The mobile communication terminal 110 receives packet data selectively and stably from all access networks (first access network 120 and second access network 130) in the vicinity of the region where it is located.

In operation S240, the PDSN 170 maintained without releasing the link with the access network 120 determines whether the set time of the 'PDSN timer' expires (S250). As a result of determining in step S250, the PDSN 170 proceeds to step S240 and maintains the link with the first access network 120 without releasing the link if the set time of the 'PDSN timer' has not expired. Here, the reason why the PDSN 170 maintains the link with the first access network 120 is because the set time of the 'PDSN timer' operated in step S210 has not expired. This is because it is likely to be located at the packet controller boundary.

In addition, when the PDSN 170 determines in step S250 that the set time of the 'PDSN timer' expires, the PDSN 170 releases the link with the 1 access network 120 (S260). Here, the reason why the PDSN 170 releases the link with the first access network 120 is that the set time of the 'PDSN timer' operated in step S210 has expired, so that the mobile communication terminal 110 has a 'packet controller boundary'. This is because it is likely to be located in the service providing area of the packet controller connected to the second access network 130.

Accordingly, if there is packet data to be transmitted to the mobile communication terminal 110, the PDSN 170 transmits the packet data to the access network (second access network 130) in which the current link is formed. The access network (second access network 130) receiving the packet data from the PDSN 170 transmits a forward link call message to the mobile communication terminal (110). The mobile communication terminal 110 receiving the forward link call message receives the packet data from the access network (second access network 130).

In FIG. 2, a method of transmitting packet data at a boundary of a service providing area of a packet controller according to the first embodiment of the present invention is described. For convenience of description, a first packet connected to the first access network 120 is described. The second packet controller 150 is connected to the controller 140 and the second access network 130, but is actually the third, fourth, and third connected to the third, fourth, and fifth access networks (not shown). There may be five packet controllers (not shown), the numbers vary.

Therefore, it is assumed that the mobile communication terminal 110 sequentially moves to the service providing areas of the first, second, and third packet controllers within the set time of the 'PDSN timer', and the 'number of packet controllers' is set to '2'. Then, the PDSN 170 is connected to the third and second packet controllers until the set time of the 'PDSN timer' expires and maintains a link with the third and second access networks handed off by the mobile communication terminal 110. do. When the 'SNSN timer' expires, the PDSN 170 releases the link with the second access network where the link is maintained, so that the link is maintained only with the third access network. In addition, since the PDSN transmits the packet data to the access network in which the link is always maintained when there is packet data to be transmitted to the mobile communication terminal 110, the mobile communication terminal 110 has a third and a third at the 'packet controller boundary'. The packet data is received from the 2 access network to increase the stability of packet data reception, and the packet service boundary of the 3rd packet controller is received only from the 3rd access network in the service providing area of the 3rd packet controller.

3 is a block diagram schematically illustrating a system for transmitting packet data at a boundary of a service providing area of a packet controller according to a second embodiment of the present invention.

A system for transmitting packet data at a boundary of a service providing area of a packet controller according to a second embodiment of the present invention is provided in a system for transmitting packet data at a boundary of a service providing area of a packet controller according to a second embodiment of the present invention. The components include a mobile communication terminal 110, a first packet controller 140, a second packet controller 150, a router 180, an HA 182, an AAA 184, and the Internet 190. It also includes a first access network 320, a second access network 330, and a PDSN 370, which are components for performing the present invention in an access network. Detailed description of the same matters as those described with reference to FIG. 1 will be omitted.

The first access network 320 according to the second embodiment of the present invention is a mobile communication via the PDSN 370 from the second access network 330 when the mobile communication terminal 110 is located at the 'packet controller boundary'. Receives information about the terminal 110 and transmits a forward link call message to the mobile communication terminal (110).

The second access network 330 according to the second embodiment of the present invention refers to a parameter for checking whether the mobile communication terminal 110 is located at a 'packet controller boundary' (hereinafter referred to as an 'access network parameter'). Set up and save. The second access network 330 according to the second embodiment of the present invention forwards to the mobile communication terminal 110 when the mobile communication terminal 110 is located at the 'packet controller boundary' using the 'access network parameter'. Send a call message for the link. In addition, the first access network 320 also transmits a forward link call message to the mobile communication terminal 110 by transmitting information about the mobile communication terminal 110 to the first access network 320 via the PDSN 370. To control.

In the present invention, the 'access network parameter' refers to the 'access network timer'. 'Access network timer' means that the mobile communication terminal 110 moves from the service providing area 162 of the first packet controller to the service providing area 164 of the second packet controller to access the second from the first access network 320. When handing off to the network 330, the second access network 330 is a timer operated to delete PANID (Previous Access Network Identification) information received and stored from the mobile communication terminal 110. When the second access network 330 receives a signal for requesting handoff from the mobile communication terminal 110, the second access network 330 operates the 'access network timer'. The access network timer can be arbitrarily set by an operator operating the system.

For example, assuming that the access network timer is set to 5 minutes, the second access network 330 receives a signal requesting a handoff from the mobile communication terminal 110 and then establishes a link with the PDSN 370. Set and activate the access network timer. The second access network 330 deletes the stored PANID information by determining that the mobile communication terminal 110 is out of the 'packet controller boundary' when the set time of the 'access network timer' expires after 5 minutes of the set time. If the mobile communication terminal 110 moves from the service providing area 164 of the second packet controller to the service providing area 162 of the first packet controller within 5 minutes of the set time, the access network timer is initialized. .

The PDSN 370 according to the second embodiment of the present invention receives information about the mobile communication terminal 110 from the second access network 330 when the mobile communication terminal 110 is located at the 'packet controller boundary'. Maintain a link with the first access network 320 and transmit the information about the mobile communication terminal 110 to the first access network 320.

4 is a flowchart illustrating a method of transmitting packet data at a boundary of a service providing area of a packet controller according to a second embodiment of the present invention.

When the mobile communication terminal 110 moves from the service providing area 162 of the first packet controller to the service providing area 164 of the second packet controller, the first access network 320 of the first packet controller 140 is moved. From the second access network 330 of the second packet controller 150. That is, the mobile communication terminal 110 requests a handoff to the second access network 330.

The second access network 330 receives a signal for requesting doment handoff from the mobile communication terminal 110 and operates an 'access network timer' (S410). The second access network 330 operating the 'access network timer' establishes a link with the PDSN 370 (S420). The second access network 330 establishing a link with the PDSN 370 maintains storage without deleting the PANID information received and stored from the mobile communication terminal 110 (S430). The second access network 330 maintaining the storage of the PANID determines whether the set time of the 'access network timer' has expired (S440).

If the set time of the 'access network timer' has not expired, the second access network 330 proceeds to step S430 and stores the PANID information received and stored from the mobile communication terminal 110 without deleting it. Keep it. The reason for maintaining the PANID information without deleting as in step S430 is because the 'access network timer' operated in step S410 has not expired, so the mobile communication terminal 110 is likely to be located at the 'packet controller boundary'. .

Accordingly, when the second access network 330 receives the packet data to be transmitted from the PDSN 370 to the mobile terminal 110 in order to stably transmit the packet data to the mobile terminal 110 at the 'packet controller boundary'. In this case, information about the mobile communication terminal 110 is transmitted to the first access network 320 through the PDSN 370. The first access network 320 receives the information on the mobile communication terminal 110 from the second access network 330 to transmit the forward link call message to the mobile communication terminal (110).

The mobile communication terminal 110 receiving the forward link call message selects an access network that transmits the largest signal strength by comparing the strengths of the signals received from the first access network 320 and the second access network 330. Packet data is received. The mobile communication terminal 110 receives packet data selectively and stably from all access networks (first access network 320 and second access network 330) in the vicinity of the region where it is located.

In addition, if the set time of the 'access network timer' has expired as a result of the determination of step S440, the second access network 330 deletes the PANID information received and stored from the mobile communication terminal 110 (S450). The reason why the second access network 330 deletes the PANID information received and stored from the mobile communication terminal 110 is because the set time of the 'access network timer' operated in step S410 has expired. This is because 110 is likely to be located in the service providing area of the second packet controller 160 connected to the second access network 330 away from the 'packet controller boundary'.

Accordingly, when the second access network 330 receives packet data to be transmitted from the PDSN 370 to the mobile communication terminal 110, the second access network 330 transmits only the forward link call message to the mobile communication terminal 110. ) Does not transmit information about the mobile communication terminal 110. The mobile communication terminal 110 receiving the forward link call message from the second access network 330 receives the packet data.

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, when the mobile communication terminal is located at the 'packet controller boundary' and frequently changes the service providing area of the packet controller, packet data can be received from all relevant access networks around the mobile communication terminal. Therefore, it is possible to increase the success rate of packet data reception and improve the quality of mobile communication service.

Claims (33)

The mobile communication terminal in a mobile communication network including a mobile communication terminal, a first access network, a second access network, a first packet control function, a second packet controller, and a PDSN (Packet Data Serving Node) A method for transmitting packet data to the mobile communication terminal when the mobile station moves from a service providing area of the first packet controller to a service providing area of the second packet controller, (a) receiving a hand off request signal from the mobile communication terminal; (b) establishing a link with the second access network; (c) determining whether to maintain a link establishment with the first access network by using a 'PDSN parameter' including a 'PDSN timer' and a 'number of packet controllers'; (d) transmitting packet data to the first access network and the second access network when maintaining the link establishment with the first access network as a result of the step (c); And (e) transmitting packet data to the second access network if the link setting with the first access network is not maintained as a result of the step (c). Packet data transmission method at the packet controller boundary comprising a. The method of claim 1, wherein the 'PDSN timer', When the mobile communication terminal handoffs from the first access network to the second access network, a timer for activating to release the link with the first access network, requesting the handoff from the second access network And operating when a signal is received. The method of claim 1, wherein the number of packet controllers is When the mobile communication terminal continuously moves the 'packet controller boundary' before the set time of the 'PDSN timer' expires, the first packet connected to the first access network and / or the second access network where the link is maintained. A maximum number of controllers and / or said second packet controllers. The method of claim 1, wherein step (c) comprises: The first access network is compared with the number of the first packet controller and / or the second packet controller connected to the first access network and / or the second access network where the link is maintained, and the number of packet controllers. And determining whether to maintain a link establishment with the packet. The method of claim 4, wherein step (c) comprises: The first access when the number of the first packet controller and / or the second packet controller respectively connected to the first access network and / or the second access network on which a link is maintained exceeds the 'number of packet controllers' A method of transmitting packet data at a packet controller boundary, comprising releasing a link establishment with a network. The method of claim 4, wherein step (c) comprises: The first packet when the number of the first packet controller and / or the second packet controller respectively connected to the first access network and / or the second access network where a link is maintained is less than or equal to the number of packet controllers; A method for transmitting packet data at a packet controller boundary, wherein the link establishment with the access network is maintained. The method of claim 1, wherein step (c) comprises: And determining whether to maintain a link establishment with the first access network by checking whether the set time of the 'PDSN timer' expires. The method of claim 7, wherein step (c) is If the set time of the 'PDSN timer' has not expired, the packet data transmission method at the packet controller boundary, characterized in that to maintain the link setting with the first access network. The method of claim 7, wherein step (c) is And if the set time of the 'PDSN timer' has expired, release the link setting with the first access network. The method of claim 1, wherein in step (d), The first access network and the second access network receiving the packet data transmit a forward link call message to the mobile communication terminal to transmit the packet data. The method of claim 1, wherein in step (e), The second access network receiving the packet data transmits the packet data by transmitting a forward link call message to the mobile communication terminal. In a mobile communication network providing a mobile communication service to a mobile communication terminal, when the mobile communication terminal is located at a boundary of a service providing area of a packet controller and changes its position from time to time to hand off the packet to the mobile communication terminal, A system for transmitting data, A first access network for transmitting a forward link page message to the mobile communication terminal and transmitting the packet data to the mobile communication terminal when the mobile communication terminal is located at the boundary; A second access network transmitting the forward link call message to the mobile communication terminal to transmit the packet data to the mobile communication terminal; It is determined whether to maintain a link establishment with the first access network by using a 'PDSN parameter' including a 'Packet Data Serving Node (PDSN) timer' and a 'number of packet controllers'. A PDSN for transmitting packet data to the second access network; A first packet control function connecting the first access network and the PDSN; And A second packet controller connecting the second access network and the PDSN And a packet data transmission system at a packet controller boundary. The method of claim 12, wherein the 'PDSN timer', When the mobile terminal hands off from the first access network to the second access network, a timer that is activated by the PDSN to release the link with the first access network, the hand from the second access network And operate upon receiving a signal requesting to be turned off. The method of claim 12, wherein the number of packet controllers, When the mobile communication terminal continuously moves the 'packet controller boundary' before the set time of the 'PDSN timer' expires, the first packet connected to the first access network and / or the second access network where the link is maintained. The maximum number of controllers and / or said second packet controllers. The method of claim 12, wherein the PDSN is, The first access network is compared with the number of the first packet controller and / or the second packet controller connected to the first access network and / or the second access network where the link is maintained, and the number of packet controllers. Determining whether to maintain a link establishment with the packet data transmission system at the packet controller boundary. The method of claim 15, wherein the PDSN is, The first access when the number of the first packet controller and / or the second packet controller respectively connected to the first access network and / or the second access network on which a link is maintained exceeds the 'number of packet controllers' A packet data transmission system at a packet controller boundary, which releases the link establishment with the network. The method of claim 15, wherein the PDSN is, The first packet when the number of the first packet controller and / or the second packet controller respectively connected to the first access network and / or the second access network where a link is maintained is less than or equal to the number of packet controllers; A packet data transmission system at a packet controller boundary, which maintains a link establishment with an access network. The method of claim 12, wherein the PDSN is, And determining whether to maintain a link establishment with the first access network by checking whether the set time of the 'PDSN timer' expires. The method of claim 18, wherein the PDSN is, And if the set time of the 'PDSN timer' has not expired, maintain a link establishment with the first access network. The method of claim 18, wherein the PDSN is, And if the set time of the 'PDSN timer' has expired, release the link setting with the first access network. The mobile communication terminal in a mobile communication network including a mobile communication terminal, a first access network, a second access network, a first packet control function, a second packet controller, and a PDSN (Packet Data Serving Node) A method for transmitting packet data to the mobile communication terminal when the mobile station moves from a service providing area of the first packet controller to a service providing area of the second packet controller, (a) receiving a hand off request signal from the mobile communication terminal; (b) establishing a link with the PDSN; (c) determining whether to delete a PANID received from the mobile communication terminal using an access network timer; (d) If it is determined in step (c) that the PANID is not deleted, a forward link page massage is transmitted to the mobile communication terminal, and the mobile communication is performed to the second access network. Transmitting information about a terminal to cause the second access network to transmit a forward link call message to the mobile communication terminal; And (e) transmitting the forward link call message to the mobile communication terminal when the PANID is deleted as a result of the step (c); And transmitting the packet data at the packet controller boundary. The method of claim 21, wherein the access network timer, When the mobile terminal is handed off from the first access network to the second access network, a timer that is operated to delete the PANID, and is operated when a signal for requesting the handoff is received from the mobile terminal. Transmitting packet data at the packet controller boundary. The method of claim 22, wherein step (c) comprises: And determining whether to delete the PANID by checking whether the set time of the 'access network timer' has expired. The method of claim 23, wherein step (c) comprises: And if the set time of the 'access network timer' has not expired, maintaining the PANID without deleting the packet data. The method of claim 23, wherein step (c) comprises: And deleting the PANID when the set time of the 'access network timer' has expired. The method of claim 21, wherein in step (d), And the mobile communication terminal selectively receives the packet data from any one of the first access network and the second access network. The process of claim 21, wherein in step (e), And the mobile communication terminal receives the packet data from the second access network. In a mobile communication network providing a mobile communication service to a mobile communication terminal, when the mobile communication terminal is located at the boundary of the service providing area of the packet controller and changes its position from time to time, the packet is handed off to the mobile communication terminal. A system for transmitting data, A first access network for transmitting a forward link page message to the mobile communication terminal and transmitting the packet data to the mobile communication terminal when the mobile communication terminal is located at the boundary; ; A second access network that determines whether to delete a PANID received from the mobile communication terminal using an 'access network parameter' and transmits information about the mobile communication terminal to the first access network; Packet data serving node (PDSN) which transmits the packet data to the first access network and / or the second access network and relays information about the mobile communication terminal transmitted from the second access network to the first access network. ); A first packet control function connecting the first access network and the PDSN; And A second packet controller connecting the second access network and the PDSN And transmitting packet data at the packet controller boundary. The method of claim 28, wherein the 'access network timer', When the mobile communication terminal is handed off from the first access network to the second access network, the timer is operated to delete the PANID, the second access network to request the handoff from the mobile communication terminal A system for transmitting packet data at a packet controller boundary, the system operating upon receipt of a signal. The method of claim 28, wherein the second access network, And determining whether to delete the PANID by checking whether the set time of the 'access network timer' has expired. The method of claim 30, wherein the second access network, And if the set time of the 'access network timer' has not expired, maintain the PANID without deleting the packet data at the packet controller boundary. The method of claim 30, wherein the second access network, And delete the PANID when the set time of the 'access network timer' expires. The method of claim 28, wherein the mobile communication terminal, And when located at the boundary, selectively receives the packet data from any one of the first access network and the second access network.

Images