KR100936532B1 - Method and System for Providing Packet Data Service With Changing Of Network Service Area - Google Patents

Abstract

The present invention relates to a method and system for providing a packet data service according to a network service area change in a mobile communication network. The method for providing a data service in a mobile communication system according to the present invention comprises the steps of: acquiring cell update information by transmitting a paging message to a mobile terminal; A network service area change checking step of checking whether a network service area of the mobile terminal has been changed using the cell update information; And a conservation mode state transition step of transitioning to a conservation mode state after releasing a preset signaling connection through a predetermined RRC connection release procedure when the network service area is changed. Accordingly, the present invention has the advantage of providing a faster and more efficient packet data call resetting method and system when the network service area is changed according to the movement of the mobile terminal in which the packet data call is set.

Mobile terminal, radio network controller, LA, RA, SGSN, retention mode, PMM, DSCR

Description

Method and system for providing packet data service according to network service area change {Method and System for Providing Packet Data Service With Changing Of Network Service Area}

The present invention relates to a method for providing a packet service in a mobile communication network. More particularly, when the network service area of a mobile terminal in which a packet data call is set is changed, the network service area can be reset more effectively. The present invention relates to a packet data service providing method and a system thereof.

The WCDMA network is mainly composed of a CN (Core Network), a Universal Terrestrial Radio Access Network (UTRAN), and a User Equipment (UE).

The UTRAN consists of one or more RNSs (Radio Network Sub_Systems), and one RNS is composed of one RNC (Radio Network and at least one base station NodeB).

In particular, the RRC (Radio Resource Control) layer of the RNC performs the mobility management function of the UE as well as the allocation, change and release of radio resources.

A mobility management function of the UE is possible from the RRC state (State) Management defined in the ^{RRC, 3GPP (3 rd Generation Partnership} Project) UE in each RRC state in the standard TS 25.331 (RRC (Radio Resource Control ) Protocol Specification) and The role and behavior of UTRAN is defined.

The RRC state is largely divided into an idle mode and a connected mode, and the connected mode includes a cell DCH state, a cell FACH state, a cell PCH state, and a URA PCH state.

The UTRAN manages the mobility of the UE in the UTRAN and controls the RRC state transition in order to efficiently perform Radio Resource Management (RRM).

In general, the UTRAN manages the location of the UE at a cell or UTRAN Registration Area (URA) level.

In particular, when there is no radio connection established in the UE, the UTRAN manages the RRC state of the UE as a Cell PCH state or a URA PCH state.

The CN is largely divided into a circuit switched service domain and a packet switched service domain.

The circuit switched service domain includes a mobile switching center (MSC), which is a circuit switch, and a gateway MSC (GMSC) that performs an access gateway function to an external circuit network, for example, a general telephone network.

The packet switching service domain includes a Serving GPRS Support Node (SGSN), which is a packet switch, and a Gateway GPRS Support Node (GGSN) that performs an access gateway function to an external packet network, for example, the Internet network, in association with the SGSN.

The CN manages the network service area at the location area (LA) and routing area (RA) levels, and the UE registers the changed network service area to the CN through the location area update (LAU) procedure and the routing area update (RAU) procedure. Can be.

Currently, in WCDMA, when there is no data transmission through a packet session established for a certain time for bursty characteristics of packet data service and efficient operation of wireless network resources, WCDMA releases the radio resources and sets the Packet Data Protocol (PDP) context. It supports Preservation Mode which keeps).

In general, in the preservation mode, a preservation timer is driven, and when the preservation timer expires, the mobile communication system and the mobile terminal release the preset radio resource and maintain the PDP (Packet Data Protocol) context.

However, in the related art, when a network service area (eg, including LA and RA) for a preset packet data call changes according to the movement of the UE, a method of maintaining continuity of the packet data call has not been provided.

An object of the present invention for solving the problems of the prior art as described above is to provide a packet data service method according to the change of the network service area that can more effectively reset the packet data when the network service area of the mobile terminal, the packet data call is set And to provide the system.

Another object of the present invention is to provide a method for reconfiguring a packet data call faster by using a preservation mode when the network service area is changed according to the movement of a mobile terminal in which a packet data call is set.

Another object of the present invention is to provide a mobile communication system capable of controlling the mobile terminal to call the conservation mode by using a specific RRC connection release reason when the RRC connection is released according to the expiration timer expiration in the conservation mode.

Other objects of the present invention will be readily understood through the following description of the embodiments.

According to an embodiment of the present invention, a data service providing method according to a network service area change in a mobile terminal in which a data call is established through a mobile communication system is disclosed.

According to an embodiment of the present invention, a method for providing a data service according to a change of a network service area in a mobile terminal receives an RRC connection release request message including a reason for releasing a predetermined Radio Resource Control (RRC) from a first wireless network controller. If so, transitioning to a conservation mode state; And a data service request for establishing a signaling connection through a second wireless network controller corresponding to the changed network service area and performing a routing path update procedure and a data service request procedure through the established signaling connection when data to be transmitted exists. Characterized in that it comprises a step.

According to another embodiment of the present invention, a method of providing a data service in a mobile communication system in which a data call is established with a mobile terminal is disclosed.

According to an embodiment of the present invention, a method for providing a data service in a mobile communication system includes: obtaining cell update information by transmitting a paging message to the mobile terminal; A network service area change checking step of checking whether a network service area of the mobile terminal has been changed using the cell update information; And a conservation mode state transition step of transitioning to a conservation mode state after releasing a preset signaling connection through a predetermined RRC connection release procedure when the network service area is changed.

According to another embodiment of the present invention, a mobile terminal for providing a data service is disclosed.

According to an aspect of the present invention, there is provided a mobile terminal comprising: cell update information transmitting means for transmitting cell update information according to a paging message received from a first wireless network controller controlling a data call; In case of receiving an RRC connection release request message including a radio resource control (RRC) release reason, a packet data protocol (PDP) context preset in accordance with the data call is maintained and a preset signaling connection is released. Conservation mode state transition means; And when there is data to be transmitted to the changed network service area, establishing a signaling connection through a second wireless network controller corresponding to the changed network service area, and requesting a data service to start a data service using the maintained PDP context. Means may be included.

According to another embodiment of the present invention, a mobile communication system for providing a data service to a mobile terminal to which a data call is established is disclosed.

According to an aspect of the present invention, there is provided a mobile communication system comprising: cell update information obtaining means for obtaining a cell update information by transmitting a paging message to a mobile terminal; Network service area change checking means for checking whether a network service area of the mobile terminal has been changed by using the cell update information; And a conservation mode state transition means for transitioning to a conservation mode state after releasing a preset signaling connection through a predetermined RRC connection release procedure when the network service area is changed.

The present invention has an advantage of providing a method and system for providing a packet data service in accordance with a possible network service area change that can more effectively maintain continuity of a packet data call when the network service area of a mobile terminal in which a packet data call is set is changed.

In addition, the present invention has an advantage of providing a method for re-establishing a packet data call faster by using a preservation mode when the network service area is changed according to the movement of the mobile terminal in which the packet data call is set.

In addition, when the RRC connection is released according to the expiration of the retention timer in the retention mode, the present invention has an advantage of providing a mobile communication system capable of controlling the mobile terminal to call the retention mode by using a specific RRC connection release reason.

In addition, the SGSN according to the present invention maintains the preset PDP context even when the existing signaling connection of the UE whose network service area is changed is released, thereby providing a corresponding service faster when packet data call reconfiguration.

In addition, the present invention can be expected to reduce the packet data call processing time and load according to the reconfiguration of the PMM connection in the core network.

As the invention allows for various changes and numerous embodiments, particular embodiments will be illustrated in the drawings and described in detail in the written description. However, this is not intended to limit the present invention to specific embodiments, it should be understood to include all modifications, equivalents, and substitutes included in the spirit and scope of the present invention.

The terms first, second, etc. may be used to describe various components, but the components should not be limited by the terms. The terms are used only for the purpose of distinguishing one component from another. For example, without departing from the scope of the present invention, the first component may be referred to as the second component, and similarly, the second component may also be referred to as the first component.

The term and / or includes a combination of a plurality of related items or any item of a plurality of related items. The terminology used herein is for the purpose of describing particular example embodiments only and is not intended to be limiting of the present invention. Singular expressions include plural expressions unless the context clearly indicates otherwise.

In this application, the terms "comprising" or "mounted" and "mounted" are intended to indicate that there is a feature, number, step, action, component, part, or combination thereof described on the specification, one Or other features or numbers, steps, operations, components, parts or combinations thereof in any way should not be excluded in advance.

Unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art. Terms such as those defined in the commonly used dictionaries should be construed as having meanings consistent with the meanings in the context of the related art, and are not construed in ideal or excessively formal meanings unless expressly defined in this application. Do not.

Other aspects, features, and advantages other than those described above will become apparent from the following drawings, claims and detailed description of the invention.

Hereinafter, a preferred embodiment of a method and system for providing a packet data service according to a network service area change in a mobile communication network according to the present invention will be described in detail with reference to the drawings.

1 is a diagram illustrating a mobile communication system structure and a network service area according to the present invention.

In the mobile communication system according to the present invention, a mobile switching center (MSC) providing a circuit switching service, a Serving GPRS Support Node (SGSN) 120 providing a packet switching service, a base station and a radio network controller managing radio network resources 130, wherein the radio network controller includes a base station controller (BSC) in GSM, a radio network controller (RNC) in WCDMA, and a radio signal transmitted and received to and from a mobile terminal. The processing base station 140 may include a base transceiver station (BTS) of GSM and a NodeB in WCDMA.

Here, one base station may be composed of at least one cell. That is, a specific base station can service a plurality of cell areas through cell division. In particular, in UMTS, a network service area called URA (UTRAN Registration Area), which is managed by a specific radio network controller 130 and is serviced by a plurality of base stations, is separately defined.

A routing area (RA) is a packet service area identifier managed by the SGSN 120, and a location area (LA) is a network service area identifier allocated for a service of a region equal to or wider than the RA.

2 is a diagram for explaining a network service area in a UMTS network.

As shown in FIG. 2, a network service area in a UMTS network may be largely classified into a location area (LA) and a routing area (RA).

Of course, the RA may consist of at least one UTRAN Registration Area (URA) and a plurality of cells present in the URA.

In general, the LA provides a wider coverage area than the RA, and the MSC and SGSN may serve at least one LA and the RA.

2, the first SGSN 210 controls packet data services in regions corresponding to RA1, RA2, RA3, RA4, and RA5, and the second SGSN 220 controls the region corresponding to RA6, RA7, and RA8. It can be seen that the control of the packet data service.

In addition, the third SGSN 230 provides packet data services of regions corresponding to RA9, RA10, and RA11.

If the mobile terminal moves to different RAs, it may inform the corresponding SGSN that the RA has been changed through a Routing Area Update (RAU) procedure. In this case, the RAU procedure includes a procedure in which the mobile terminal transmits a RAU request message to the SGSN, and after the SGSN updates the RA information for the mobile terminal, transmitting a RAU confirmation message indicating that the update is completed to the mobile terminal. Include.

In addition, when the RA and the LA change simultaneously with the movement of the mobile terminal, the LA may be updated at the same time using the RAU procedure.

In addition, when the mobile terminal moves to different LAs, the mobile terminal may inform the corresponding SGSN that the LA has been changed through a location area update (LAU) procedure.

3 is a state diagram illustrating an RRC state transition in a WCDMA system.

As shown in FIG. 3, a radio resource control (RRC) state is largely divided into an idle mode 302 and a connected mode 306.

Here, the RRC transmits and receives a control message related to setup, reconfiguration, and release of a radio bearer between a WCDMA network and a mobile terminal (hereinafter, referred to as a user equipment (UE)). Signaling protocol for.

In addition, the RRC is a signaling protocol for performing a measurement control procedure and a cell update procedure.

The RRC state defines the types of transport channels that can be used by the UE 100 in the connected mode 306 and how to operate in each RRC state.

The idle mode 302 means a state in which the power of the UE 100 is turned off or does not have any wireless connection with the UTRAN 110.

The connected mode 306 includes a Cell Dedicated Channel (DCH) state 308, a Cell Forward Access Channel (FACH) state 310, a Cell Paging Channel (PCH) state 312 and a URA PCH state 314.

The transition from idle mode 302 to connected mode 306 is through RRC connection establishment 316 or 320.

Conversely, switching from connected mode 306 to dormant mode 302 is possible via RRC disconnection 318 or 322.

For example, when the UE 100 requests a new call establishment through a random access channel (RACH) (eg, an RRC connection establishment request message), the RRC state transitions from a dormant state 304 to a cell FACH state 310.

At this time, if the UTRAN 110 allocates a dedicated resource to the UE 100 through the FACH in the Cell FACH state 310 (eg, an RRC connection establishment response message), the RRC state of the UE 100 is Cell. Transition to DCH state 308.

If the allocated dedicated resources are released by the UE 100 or the UTRAN 110, the RRC state transitions to the idle state 304.

In the following description, each state included in the connection mode 306 will be described in detail.

In general, the UE 100 may establish a wireless connection through a common channel or a dedicated channel.

The wireless connection using the common channel (eg, FACH) is established when low bit rate data is transmitted between the UE 100 and the UTRAN 110.

On the other hand, in services requiring high data and low delay, a dedicated channel (eg, a dedicated channel (DCH)) may be set between the UE 100 and the UTRAN 110.

That is, the Cell FACH state 310 is a state used when transmitting slow data or when the UTRAN 110 transmits dedicated resource allocation information to the UE 100 as described above.

If the wireless connection using the dedicated resource allocation information is successful, the RRC state of the UE 110 transitions to the Cell DCH state 308.

In particular, in the case of a handover, since the RRC connection establishment message for a new wireless connection may be transmitted through a preset wireless connection, the RRC state does not go directly through the cell FACH state 310 and is immediately dormant (304). Transition to Cell DCH State 308 at.

If there is no data to transmit in Cell FACH state 310 or Cell DCH state 308, the RRC state transitions to Cell PCH state 312 or URA PCH state 314.

Once the RRC state of UE 100 transitions to Cell PCH state 312 or URA PCH state 314, UE 100 receives the Discontinuous Reception (DRX) cycles received from UTRAN 110. Monitor the paging channel according to the information.

In this case, when the UE 100 receives a paging message through the paging channel, the UE 100 transmits a paging response message to the UTRAN 110 using a random access channel (RACH) and then transitions to the cell FACH state 310.

4 is a PMM state transition diagram for mobility management for a packet data service in UMTS.

As shown in FIG. 4, the Packet Mobility Management (PMM) state is PMM disconnected state 410-hereinafter referred to as "PMM Detached State", PMM connected state 420-hereinafter referred to as "PMM Connected State" And PMM idle state 430, hereinafter referred to as the "PMM Idle state".

The PMM Detached state 410 means a state in which no radio connection and an activated packet data protocol context (hereinafter, referred to as a "packet data protocol" context) between the mobile terminal and the mobile communication system are set.

Here, the PDP context is a core network such as static or dynamic IP address information allocated to the mobile station, a corresponding PDP address received from GGSN, a PDP type, and a Packet Flow ID based on QoS (Quality of Service) negotiation. Information related to the packet data service may be included.

In addition, in the PMM Detached state 410, no available location or routing information for a specific mobile terminal is present in the SGSN. That is, the SGSN may not be able to communicate with the mobile terminal because there is no location or routing information for the mobile terminal in the PMM Detached state 410.

In the following description, a procedure in which a mobile terminal assigns a PDP context from SGSN will be referred to as a packet service attach (PS) attach procedure. On the contrary, a procedure of releasing an activated PDP context will be referred to as a packet service detach (PS) procedure.

Accordingly, the mobile terminal in the PMM Detached state 410 transitions to the PMM Connected state 420 through the packet service connection procedure, and the mobile terminal in the PMM Connected state 420 receives the PMM Detached state 410 through the packet service connection release procedure. You can transition to).

In more detail, the packet service access procedure may include a procedure for establishing a PS signaling connection for packet services and an Activate PDP context procedure for activating a PDP context.

Here, the PS Signaling Connection setup procedure is an RRC connection setup procedure, where the RRC connection setup procedure is a procedure for establishing a signaling channel between the radio network controller and the mobile terminal, and an Iu connection setup procedure, wherein the Iu connection setup procedure is a wireless This is a procedure for establishing a signaling path between the network controller and the SGSN.

That is, the mobile terminal establishes a signaling radio bearer (SRB) for packet service through an RRC connection establishment procedure, and transmits an Activate PDP Context Request message for activating the PDP context to the corresponding SGSN through the configured SRB. have.

The mobile terminal can receive a packet data service from the core network by receiving an Activate PDP Context Accept message from the SGSN.

In this case, the RRC connection establishment procedure includes a step in which a mobile terminal transmits an RRC connection request message, and the mobile terminal generates an RRC connection establishment message generated by a radio network controller (RNC). Receiving a setup message from the access base station and transmitting the RRC connection setup complete message to the access base station when the RRC connection setup is completed.

The mobile terminal in the PMM Connected state 420 transitions to the PMM IDLE state 430 when the SRB for the preset packet service is released through the RRC connection release procedure.

In this case, the RRC connection release procedure includes a step of the radio network controller transmitting an RRC connection release message to the mobile terminal and an RRC connection release completion message indicating that the mobile terminal has released a preset RRC connection release (RRC Connection Release). Sending a message) to the radio network controller.

On the contrary, the mobile terminal in the PMM IDLE state 430 may perform a cell update procedure and an RRC connection establishment procedure through a paging message received from SGSN, thereby establishing a signaling connection for packet service. At this time, the PMM state of the mobile terminal transitions to the PMM Connected state 420.

The mobile terminal in the PMM IDLE state 430 may transition to the PMM Detached state 410 through a packet service connection release procedure.

5 is a flowchart illustrating a packet service mobility management method in a WCDMA system.

In more detail, FIG. 5 illustrates a procedure of setting a packet data call to an updated network service area when a network service area (eg, including RA and LA) is updated as the mobile terminal moves. It is for the drawing.

In the following description, a first serving RNC (SRNC) that manages a radio resource currently configured in the UE 510 is assigned to a first RNC 520 and a new serving serving RNC for the corresponding UE 510 later according to an update of a network service area. The RNC to be referred to as a second RNC (530).

Referring to FIG. 5, in case of a general WCDMA packet data call, if there is no packet data transmitted through the PDP session for a predetermined time after the PDP session is established by the SGSN 540, the RRC state of the UE 510 is used. Transitions to the Cell_PCH or URA_PCH state (S500).

For the UE 510 in the Cell_PCH state or the URA_PCH state, the first RNC 520 may drive a predetermined retention mode timer to determine whether to release the preset PDP session (S502). Here, the retention mode timer may be reset if packet data exists before the timer expires.

If the preservation mode timer expires, the first RNC 520 performs a procedure of releasing a preset Iu bearer between the first RNC 520 and the SGSN 540 (S504 to S512).

Here, the Iu bearer release procedure may be performed by the first RNC 520 transmitting an Iu bearer release request message to the SGSN 530 (S504) and the SGSN 540 sending an Iu bearer release command to the first RNC 520. (S506), the first RNC 520 releases the corresponding Iu bearer (S508) and transmits an Iu bearer release complete message to the SGSN 540 (S510) and the SGSN 5540 is configured for the corresponding UE 510 (S510). It may include the step of releasing the lu bearer resource (S512).

In particular, the first RNC 520 provides a predetermined control indicating that the UE 510 can request packet data service again in order to prevent the SGSN 540 from releasing preset PDP session information according to an Iu bearer release request. Note that information-for example, "User Reactivity"-can be included in the Iu bearer release request message and transmitted.

When Iu bearer release is normally completed, the first RNC 520 transmits a paging message to the UE 510 (S514). Here, the paging message may be used for checking whether the network service area of the corresponding UE has changed.

When the UE 510 receives the paging message, the UE 510 transmits a paging response message including the cell update information to the first RNC 520 (S516).

Here, the first RNC 520 is the best cell included in the cell update information, where the best cell means a cell having the strongest received signal strength among neighboring cells of the UE 510. ) May be present in the service area controlled by the first RNC 520.

Accordingly, the first RNC 520 according to the present invention may determine to what value the RRC release cause of the RRC connection release request message to be transmitted is set according to the cell update information.

For example, if the best cell included in the cell update information is a cell that is not included in the service area managed by the first RNC 520, the value of the RRC release cause may cause the signaling connection to the network service area immediately changed after the RRC connection is released. Can be set to Directed Signaling Connection Re-Establishment (DSCR) to instruct to reset.

The first RNC 520 transmits a Cell Update Confirm message to the UE 510 (S518), and then sends an RRC connection release request message to the UE 510 to release a preset Radio Bearer (RB) and SRB. (S520). Here, the release reason included in the RRC connection release request message may be set to DSCR.

Here, the DSCR is an RRC Connection Release Cause for identifying a case in which a signaling connection establishment request is made by an upper layer immediately after the RRC connection is released.

The UE 510 releases the preset SRB according to the RRC connection release request received from the first RNC 520 and transmits an RRC connection release complete message to the first RNC 520 (S522). At this time, the PMM state of the UE 510 transitions from the PMM Connected state 420 to the PMM IDLE state 430.

Thereafter, the UE 510 and the SGSN 540 respectively release the corresponding PS by deleting the corresponding PDP context (S524). At this time, the PMM state of the UE 510 transitions from the PMM IDEL state 430 to the PMM Detached state 410.

If the UE 510 moves to the service area of the second RNC 530 and needs new packet data transmission, the UE 510 may establish a signaling connection by performing an RRC connection establishment procedure with the second RNC 530 (S526).

After performing the RAU procedure through the established signaling connection, the UE 510 transmits a PDP context activation request message to the SGSN 540 (S528).

When the SGSN 540 receives the received PDP Context Activation Request message, the SGSN 540 generates a new PDP Context for the UE 510 in association with a Gateway GPRS Support Node (GGSN) (S530). The SGSN 540 then generates a second RNC. Radio Bearer (RB) for user data transmission in conjunction with 530 (where RB means wired and wireless channels for user data transmission between the second RNC 530 and the UE 510) and RAB (Radio) Access Bearer), where RAB denotes a wired channel for transmitting user data between the second RNC 530 and the SGSN 540 (S532).

The SGSN 540 transmits an PDP Context Activation Accept message including the generated PDP Context information to the UE 510 (S534).

Thereafter, the UE 510 transmits data through the established PDP session (S536). When the data transmission is completed, the RRC state of the UE 510 transitions to the Cell_PCH state or the URA_PCH state.

As described above, when the UE 510 in the PMM Connected state 420 receives a RRC connection release request message from the SRNC due to a change in the network service area, all of the preset signaling connection and the activated PDP session are released. . Accordingly, when the UE 510 resumes packet data transmission in the updated network service area, there is a problem in that the signaling connection establishment procedure and the PDP connection establishment procedure are performed again.

That is, the conventional packet data service providing method according to the change of the network service area has a problem in that it takes a lot of call processing time according to the PDP connection reset.

6 is a flowchart illustrating a packet data service providing method according to a change of a network service area according to an embodiment of the present invention.

In more detail, FIG. 6 is a flowchart illustrating a method of reconfiguring a PMM connection using a conservation mode when a network service area is changed as the UE 610 moves.

Steps 600 to 618 illustrated in FIG. 6 perform the same procedure as steps 500 to 518 of FIG. 5, and thus, the description of FIG. 5 will be replaced.

In step 620, the first RNC 620 transmits an RRC connection release request message to the UE 610 in which the RRC Release Cause is DSCR.

If the RRC Release Cause of the received RRC connection release message is DSCR, the UE 610 releases the signaling connection and transmits an RRC connection release complete message to the first RNC 620 (S622).

Thereafter, the UE 610 releases the signaling connection and transitions to the conservation mode state which maintains the preset PDP context (S624).

Of course, the SGSN 640 also maintains the PDP context that is set corresponding to the UE 610 as it is.

If the UE 610 moves to the service area of the second RNC 630 and needs to transmit new packet data, the UE 610 may establish a signaling connection by performing an RRC connection establishment procedure with the second RNC 430 (S626).

The UE 610 performs the RAU procedure through the established signaling connection, thereby SGSN including information about the changed network service area, for example, including at least one of a location area identity (LAI) and a routing area identity (RAI). In operation 628, the method transmits to S640. At this time, the SGSN 640 registers information about the changed network service area in a home location register (HLR).

The UE 610 transmits a service request message with the service type set to data to the SGSN 640 (S630).

The SGSN 640 sets a bearer for user data transmission according to the received service request message, where the bearer includes RB and RAB (S632).

Thereafter, the UE 610 transmits data through the configured bearer (S634), and when the data transmission is completed, the RRC state of the UE 510 transitions to the Cell_PCH state or the URA_PCH state (S636).

As described above, according to the present invention, when the UE 610 receives an RRC connection release request message in which the RRC Release Cause is DSCR, the UE 610 transitions to a preservation mode that does not release the PDP context information. There is no need to be reassigned.

That is, the present invention can guarantee the continuity of the packet data service and can shorten the call processing time by using the retention mode.

In addition, the SGSN 640 according to the present invention maintains a preset PDP context even when the existing signaling connection of the UE 610 whose network service area is changed is released, thereby providing a corresponding service more quickly when reconfiguring packet data calls. There is an advantage to this.

Therefore, the present invention can expect the effect of reducing the packet data call processing time and load according to the reconfiguration of the PMM connection in the core network.

Preferred embodiments of the present invention described above are disclosed for purposes of illustration, and those skilled in the art will be able to make various modifications, changes, and additions within the spirit and scope of the present invention. Additions should be considered to be within the scope of the following claims.

1 is a view for explaining a mobile communication system structure and network service area according to the present invention.

2 is a diagram for explaining a network service area in a UMTS network.

3 is a state diagram illustrating an RRC state transition in a WCDMA system.

4 is a PMM state transition diagram for mobility management for packet data services in UMTS.

5 is a flowchart illustrating a general packet service mobility management method in a WCDMA system.

6 is a flowchart illustrating a packet data service providing method according to a change of a network service area according to an embodiment of the present invention.

* Key Drawing

410: PMM Detached State

420: PMM Connected State

430: PMM Idle State

610: user equipment (UE)

620: first RNC

630: second RNC

640: Serving GPRS Support Node (SGSN)

Claims (19)

A data service providing method according to a network service area change in a mobile terminal in which a data call is established through a mobile communication system, Transitioning to a conservation mode state when the RRC connection release request message including a predetermined RRC release reason message is received from the first wireless network controller; And If there is data to be transmitted, a data service request step of performing a routing path update procedure and a data service request procedure by establishing a signaling connection through a second wireless network controller corresponding to the changed network service area, The RRC release reason is Directed Signaling Connection Re-Establishment (DSCR). delete The method of claim 1, After releasing the preset signaling connection through the first wireless network controller, the terminal transitions to the preservation mode state, and according to the change of the network service area in the mobile terminal in which the preset PDP context is maintained. How data services are provided. The method of claim 1, After the data service request step, Setting up a bearer for user data transmission according to a control signal of the second wireless network controller; And Transiting to a paging standby state after transmitting the data to be transmitted through the set bearer The data service providing method according to the network service area change in the mobile terminal further comprising. The method of claim 4, wherein The paging standby state is any one of a Cell_PCH state, URA_PCH state, the data service providing method according to the network service area change in the mobile terminal. The method of claim 1, The mobile communication system is a WCDMA system, characterized in that the data service providing method according to the network service area change in the mobile terminal. The method of claim 1, Transmitting a cell update information for transmitting a paging response message including cell update information to the first wireless network controller according to a paging message received from the first wireless network controller before the preservation mode state transition step; A data service providing method according to a network service area change in a mobile terminal comprising a. The method of claim 1, And in the data service request step, the routing path update procedure and the data service request are processed by a packet switch corresponding to the changed network service area. The method of claim 1, The network service area includes a location area (LA) and a routing area (RA), the data service providing method according to the network service area change in the mobile terminal. A method for providing a data service in a mobile communication system in which a data call is established with a mobile terminal, Acquiring cell update information by transmitting a paging message to the mobile terminal; A network service area change checking step of checking whether a network service area of the mobile terminal has been changed using the cell update information; And As a result of the check, when the network service area is changed, the transition of the conservation mode state to the transition to the conservation mode state after releasing the preset signaling connection through a predetermined RRC connection release procedure; Method of providing a data service in a mobile communication system comprising a. The method of claim 10, And ui bearer releasing step of releasing an Iu bearer corresponding to the set data call upon expiration of a preserving timer started before the cell update information obtaining step. The method of claim 10, The RRC connection release procedure Transmitting, to the mobile terminal, an RRC connection release request message whose RRC connection release reason is set to Directed Signaling Connection Re-Establishment (DSCR); And Receiving an RRC disconnection completion message from the mobile terminal Method of providing a data service in a mobile communication system comprising a. The method of claim 12, When the RRC connection release request message set to the DSCR is received by the mobile terminal, the mobile communication system maintains a PDP (Packet Data Protocol) context set in the mobile terminal corresponding to the data call. How to Provide Data Services in the World The method of claim 10, And in the preservation mode state transition step, maintain a PDP context in the mobile communication system corresponding to the set data call. The method of claim 14, And providing a data service using a PDP context maintained in the mobile communication system when requesting a data service through the changed network service area. Cell update information transmitting means for transmitting cell update information according to a paging message received from a first wireless network controller controlling a data call; In case of receiving an RRC connection release request message including a radio resource control (RRC) release reason, a packet data protocol (PDP) context preset in accordance with the data call is maintained and a preset signaling connection is released. Conservation mode state transition means; And If there is data to be transmitted to the changed network service area, a data service request means for establishing a signaling connection through a second wireless network controller corresponding to the changed network service area and starting a data service using the maintained PDP context. Mobile terminal comprising a. The method of claim 16, And routing path updating means for transmitting the information about the changed network service area to the packet switch connected to the second wireless network controller through the established signaling connection. A mobile communication system for providing a data service to a mobile terminal in which a data call is established, Cell update information obtaining means for sending a paging message to the mobile terminal to obtain cell update information; Network service area change checking means for checking whether a network service area of the mobile terminal has been changed by using the cell update information; And Conservation mode state transition means for transitioning to a conservation mode state after releasing a predetermined signaling connection through a predetermined RRC connection release procedure when the network service area is changed as a result of the confirmation; Mobile communication system comprising a. The method of claim 18, When transitioning to the preservation mode state, a PDP (Packet Data Protocol) context corresponding to the data call is maintained, and data is requested using the maintained PDP context when a data service request is made through the changed network service area. A mobile communication system, characterized by providing a service.

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