KR101973595B1 - Apparatus and communication for controlling paging - Google Patents

Abstract

A paging control device and a communication system are disclosed. Here, the paging control apparatus may include a storage unit for storing priority information of a network in which an idle subscriber station first accesses among the plurality of different networks in a service area where a plurality of different networks are hierarchically overlapped; And a paging controller for determining paging from a network having a higher priority than the plurality of different networks based on the priority information.

Description

[0001] APPARATUS AND COMMUNICATION FOR CONTROLLING PAGING [0002]

The present invention relates to a paging control device and a communication system.

3G (UTRAN) / LTE (e-UTRAN) In the case of a terminal supporting two networks, location registration is performed in each of 3G (UTRAN) and LTE (e-UTRAN). In other words, when accessing LTE (e-UTRAN), it executes Tracking Area Update (TAU) and registers location in LTE (e-UTRAN) network. Thereafter, when there is data to be received in the terminal, the network sends a paging message to the TA of the corresponding terminal to wake up the terminal and transmit data. When the terminal accesses the 3G (UTRAN), it performs location registration by proceeding with a Routing Area Update (RAU). If there is data to be transmitted to the corresponding terminal, it transmits paging to the corresponding routing area, do.

At this time, when the terminal moves to LTE↔3G and 3G↔LTE, RAU and TAU are performed, respectively, and paging is transmitted to the corresponding RA or TA based on the location registered information.

However, when the mobile station moves frequently to LTE < > 3G, network resources are wasted due to repeated location registration procedures. To solve this problem is an Idle Mode Signaling Reduction (ISR) service.

Idle mode Signaling Reduction (ISR) is a service that increases the efficiency of network resources by reducing signaling for location registration when terminals move to different access networks such as 3G (UTRAN) and LTE (e-UTRAN) to be. That is, if the UE is in the idle mode, the UE registers location in each of the 3G (UTRAN) and the LTE (e-UTRAN) networks and then performs movement or cell reselection between two RATs (Radio Access Technology) It is a technique for not registering a separate location.

Accordingly, if the ISR is activated, when the downlink (DL) data to the corresponding terminal arrives, the paging is simultaneously sent to the 3G (UTRAN) and the LTE (e-UTRAN) And transmit the downlink data to the terminal. A detailed description of such an ISR is available in the standard documents 3GPP TS23.401 v9.3.0 and 3GPP TS 23.060 v9.3.0.

However, such an ISR scheme may reduce the location registration load during transition between LTE and 3G networks, but the paging load must be increased due to simultaneous paging by both networks.

According to an aspect of the present invention, there is provided a paging control apparatus and a communication system capable of optimally paging according to a Dedicated Priority for individually setting up a network to which terminals are preferentially connected in an ISR (Idle Mode Signaling Reduction) system .

According to an aspect of the present invention, a paging control apparatus stores priority information of a network in which an idle subscriber station accesses a plurality of different networks first in a service area in which a plurality of different networks are hierarchically overlapped A storage unit; And a paging controller for determining paging from a network having a higher priority than the plurality of different networks based on the priority information.

In this case, the paging control apparatus further includes a determination unit that determines whether or not a paging response is received from a first network having a higher priority,

If the paging response is not received, the paging control unit may determine paging to the second network of the next priority.

The determination unit may determine whether a paging response is received from the first network when the timer expires by driving a timer.

In addition, the overlapped service area may be configured such that a service area of a first network and a service area of a second network, which are different from each other in wireless access technology, are mapped to each other, Location registration may not be performed again when moving between the service area and the service area of the second network.

The service area of the first network is wider than the service area of the second network and is overlapped with the service area of the at least one second network. The service area of the first network and the service area of the at least one second network, May each include a plurality of cells.

Also, the priority information may be set based on the subscriber's rate plan.

According to another aspect of the present invention, there is provided a communication system including a service area in which a plurality of different networks are hierarchically overlapped, a subscriber terminal in an idle state, Subscriber server; And a serving gateway for receiving the downlink data, selecting the network to which the paging for the downlink data is to be preferentially performed by checking the priority information, and transmitting the downlink data notification to the selected network.

At this time,

Determining whether a paging response is received after transmitting the downlink data notification to a first higher priority network; and if the paging response is not received, transmitting the downlink data notification to a second higher priority network Can be performed.

The serving gateway may further include:

After transmitting the downlink data notification to the first network having the higher priority and driving the timer to expire, it can be determined whether the paging response is received.

The communication system may further include: a mobility management object that performs paging with the subscriber terminal when the downlink data notification is received from the serving gateway; And

Further comprising a packet switching support node for performing paging to the subscriber terminal when the downlink data notification is received from the serving gateway,

The serving gateway transmits the downlink data notification to the packet switching support node when the UTRAN has the highest priority, and if the paging response is not received, Link data notification, and if the Evolved Universal Terrestrial Radio Access Network (e-UTRAN) is the highest priority, send the downlink data notification to the mobility managed object, and if a paging response is not received, And send the downlink data notification to the support node.

According to another aspect of the present invention, a communication system stores priority information of a network to which a subscriber terminal in an idle state first accesses among a plurality of different networks, in a service area in which a plurality of different networks are hierarchically overlapped A home subscriber server; A serving gateway for transmitting downlink data notification when downlink data is received; And a mobility management object for receiving the downlink data notification, selecting a network to which paging for the downlink data is preferentially performed by checking the priority information, and performing paging with the selected network.

At this time, the mobility management object performs paging to a first network having a higher priority, determines whether a paging response is received, and if the paging response is not received, paging is performed to a second network having a higher priority .

In addition, the mobility management object may determine whether the paging response is received when the mobility management object expires by driving a timer after performing paging with the first network having the higher priority.

The communication system may further include a packet switching support node for performing paging to the subscriber station when a paging request is received from the mobility management object,

The mobility management object performs paging to the packet switching support node when the UTRAN has the highest priority, performs paging to the subscriber terminal if a paging response is not received, When the Evolved Universal Terrestrial Radio Access Network (UTRAN) has the highest priority, the UE performs paging to the subscriber station, and if the paging response is not received, the packet switching support node can perform paging.

According to an embodiment of the present invention, when paging is preferentially performed on a network based on network information supported by a terminal in a network supporting ISR (Idle Mode Signaling Reduction), the terminal responds with a high probability Therefore, the paging load can be improved because a paging response can be received even if paging is not transmitted to both networks.

FIG. 1 shows a service area in which a plurality of different networks are hierarchically overlapped according to an embodiment of the present invention.
FIG. 2 shows a configuration of a communication system according to an embodiment of the present invention to which FIG. 1 is applied.
3 is a block diagram showing a configuration of a paging control apparatus of the Serving Gateway of FIG.
4 is a flowchart illustrating a paging control method according to one embodiment of FIG. 2 and FIG. 3. FIG.
FIG. 5 is a flowchart illustrating a paging control method according to another embodiment of FIGS. 2 and 3. FIG.
FIG. 6 shows a configuration of a communication system according to another embodiment of the present invention to which FIG. 1 is applied.
7 is a block diagram showing the configuration of the paging control apparatus of the MME of Fig.
FIG. 8 is a flowchart illustrating a paging control method according to the embodiment of FIGS. 6 and 7. FIG.
FIG. 9 is a flowchart illustrating a paging control method according to another embodiment of FIGS. 6 and 7. FIG.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art can easily carry out the present invention. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. In order to clearly illustrate the present invention, parts not related to the description are omitted, and similar parts are denoted by like reference characters throughout the specification.

Throughout the specification, when an element is referred to as " comprising ", it means that it can include other elements as well, without excluding other elements unless specifically stated otherwise.

Also, the terms " part, " " module, " and " module ", etc. in the specification mean a unit for processing at least one function or operation and may be implemented by hardware or software or a combination of hardware and software have.

In this specification, a terminal includes a mobile station (MS), a mobile terminal (MT), a subscriber station (SS), a portable subscriber station (PSS), a user equipment , An access terminal (UE), an access terminal (AT), and the like, and may include all or some functions of a terminal, a mobile terminal, a subscriber station, a mobile subscriber station, a user equipment,

In this specification, a base station (BS) includes an access point (AP), a radio access station (RAS), a node B, an evolved NodeB (eNodeB) A base station (BTS), a mobile multihop relay (MMR) -BS, or the like, and may perform all or a part of functions of an access point, a radio access station, a Node B, an eNodeB, a base transceiver station, .

Hereinafter, a paging control apparatus and a communication system according to an embodiment of the present invention will be described in detail with reference to the drawings.

FIG. 1 shows a service area in which a plurality of different networks are hierarchically overlapped according to an embodiment of the present invention.

Referring to FIG. 1, a Location Area (LA) 1 (1) and an LA 2 (3) are areas provided by a Universal Terrestrial Radio Access Network (UTRAN). The LA1 1 includes a plurality of cells managed by an SGSN (Serving GPRS Support Node) 1 (5). And LA2 (3) includes a plurality of cells managed by SGSN2 (7).

In addition, TA (Tracking Area) 1 9, TA 2 11 and TA 3 13 are areas where e-UTRAN (Evolved Universal Terrestrial Radio Access Network) provides services. The TA1 9, TA2 11 and TA3 13 respectively include a plurality of cells managed by an MME (Mobility Management Entity) 15.

In addition, the user terminal 17 supports two networks: UTRAN (or 3G) and LTE (or e-UTRAN).

At this time, LA1 (1) is mapped to TA1 (9) and TA2 (11), and LA2 (3) is mapped to TA3 (13). Here, the mapping means that cells of the corresponding cell, for example, LA1 (1) and TA1 (9) overlap each other. The mapping information between the LA (1, 3) and the TA (9, 11, 13) is managed in the MME 15 in the form of a mapping table.

The TA3 13 mapped to the TA1 9, TA2 11 and LA2 3 mapped to the LA1 1 does not perform the tracking area update procedure and the user terminal 17 enters It means the tracking areas that can be used. At this time, when the user terminal 17 moves from LA1 (1) to TA1 (9) or TA2 (11) or from LA2 (3) to TA3 (13), Idle mode Signaling Reduction If so, the location registration procedure is not done. More specifically, it is as follows.

That is, when the user terminal 17 is in the idle mode, it performs location registration with the SGSNs 5 and 7 and the MME 15 through the E-UTRAN cell and the UTRAN cell, respectively. Thereafter, when the user terminal 17 performs movement or cell reselection between LA1 (1) and TA1 (9), LA1 (1), TA2 (11), LA2 (3) , Separate location registration is not performed.

FIG. 2 shows a configuration of a communication system according to an embodiment of the present invention to which FIG. 1 is applied.

Referring to FIG. 2, the communication system includes a user terminal 100, a UTRAN (3G) system 200, and an LTE system 300.

At this time, the user terminal 100 includes a UTRAN (3G) module 101 connected to the UTRAN (3G) system 200 and an LTE module 103 connected to the LTE system 300. Thus, the user terminal 100 may connect to these two networks, i.e., the UTRAN (or 3G) system 200 and the LTE (or e-UTRAN) system 300.

The UTRAN (3G) system 200 includes a Node B 201, a Radio Network Controller (RNC) 203, a Serving GPRS Support Node (SGSN) 205, and a Gateway GPRS Support Node, Packet Gateway Support Node) 207.

Here, the NodeB 201 is a macro base station that manages the cells of the LA (1, 3) in FIG. 1, and performs wireless transmission so that the user terminal 100 can access the cells of the LA (1, 3).

The RNC 203 is connected to the NodeB 201 through an interface called Iub. And is responsible for the control of the use and integrity of the radio resources, and handles handover in which signal processing is required to the various user terminals 100.

The SGSN 205 is a node for transferring data packets with a mobile station in a service area. The SGSN 205 has functions such as packet routing and transmission, mobility management, logical link management, authentication and charging, (Cell, visitor location register, etc.), user profile (international mobile station identification number: IMSI), and the like.

At this time, when the user terminal 100 accesses the UTRAN (or 3G) system 200, the SGSN 205 proceeds with a Routing Area Update (RAU) to perform location registration. Then, when downlink data is generated in the user terminal 100, the RAU performs paging to the advanced LA1 101 and 103 to wake up the user terminal 100 to enable downlink data reception.

The GGSN 207 is a node responsible for a connection function between a general packet radio service (GPRS) backbone network and an external packet data network. Converts the GPRS packet coming from the SGSN 205 into a packet data protocol (PDP) format (e.g., IP, X.25), and converts the PDP address of the incoming packet data to the receiver's GSM address. It also stores the address and user profile of the current user's SGSN, and performs authentication and charging functions.

The LTE system 300 includes an eNodeB 301, an MME (Mobility Management Entity) 303, a Serving Gateway (S-GW) 305, a Packet Data Network Gateway (P- PDN gateway) 307, an operator's IP service 309, and an HSS (Home Subscriber Server) 311.

The eNodeB 301 is a femto base station that manages the cells of the TA (9, 11, 13) of FIG. 1 and is responsible for wireless transmission so that the user terminal 100 can access the cells of the TA do.

The MME 303 is an apparatus for managing the network connection of the user terminal 100, and its main functions are authentication, security, and mobility management.

At this time, when the user terminal 100 accesses the LTE (or e-UTRAN) system 300, the MME 303 proceeds with the Tracking Area Update (TAU) to register the location. Thereafter, when downlink data is generated in the user terminal 100, the RAU performs paging to the advanced TAs 9, 11, and 13 to wake up the user terminal 100 to receive the downlink data.

Serving Gateway 305 serves as a mobility anchor when the user terminal 100 moves between handoffs between eNodeBs 301 or between 3GPP wireless networks.

The PDN gateway 307 allocates an IP (Internet Protocol) address of the user terminal 100, performs packet data related functions of the core network, and acts as a mobile anchor when moving between the 3GPP radio network and the non-3GPP radio network .

The operator's IP service 309 refers to a service provider and transmits downlink data to the user terminal 100.

An HSS (Home Subscriber Server) 311 performs subscriber information management in the All IP network.

At this time, the HSS 311 stores the Dedicated Priority set for each user terminal 100. The Dedicated Priority means priority information of a network to which the user terminal 100 accesses when the user terminal 100 is in the idle state. That is, the user terminal 100 determines whether to stay in the UTRAN (or 3G) Or e-UTRAN) and can be configured as shown in Table 1 below.

Subscribers Network access priority A One LTE (or e-UTRAN) 2 UTRAN (or 3G) B One UTRAN (or 3G) 2 LTE (or e-UTRAN)

According to Table 1 above, the subscriber A is LTE (or e-UTRAN) in the first place, and if LTE (or e-UTRAN) exists, it remains in the LTE (or e-UTRAN) 300 preferentially in the idle state. In addition, subscriber B stays in the UTRAN (or 3G) system 200 preferentially in the idle state when the UTRAN (or 3G) exists because the first rank is UTRAN (or 3G).

In addition, the priority information in Table 1 can be set based on the plan for each subscriber. For example, LTE (or e-UTRAN) may be preferentially connected to a subscriber of an LTE network only plan.

The Dedicated Priority is acquired from the HSS 311 at the time of Attach or location registration by the base stations 201 and 301 of each cell through a separate signaling procedure and transmitted to the user terminal 100. Accordingly, when the user terminal 100 is in the idle state, it first accesses the UTRAN (or 3G) system 200 or the LTE (or e-UTRAN) system 300 according to the Dedicated Priority.

The SGSN 205 is connected to the Serving Gateway 305 and the HSS 311 is connected to the MME 303 and the Serving Gateway 305.

Here, the Serving Gateway 305 includes a paging control device that controls paging according to the Dedicated Priority. Here, the paging control device may be in the form of a function or a module to be additionally installed in the Serving Gateway 305, and may be in the form of hardware or software, or a combination of hardware and software.

3 is a block diagram showing a configuration of a paging control apparatus of the Serving Gateway of FIG.

3, the paging control apparatus 400 of the Serving Gateway includes a receiving unit 401, a determination unit 403, and a paging control unit 405.

Now, the operation of the paging control apparatus 400 of the Serving Gateway will be described with reference to FIGS. 4 and 5. FIG.

4 is a flowchart illustrating a paging control method according to an embodiment of FIG. 2 and FIG. 3. Referring to FIG. At this time, a paging control method for the subscriber A in Table 1 will be described.

4, when the PDN gateway 307 transmits downlink data to the Serving Gateway 305 (S101), the receiving unit 401 of the paging control device 400 of the Serving Gateway 305 transmits the downlink data .

Next, the paging control unit 405 of the paging control apparatus 400 of the Serving Gateway 305 checks the Dedicated Priority from the subscriber information of the user terminal 100 from the HSS 311 (S103). That is, the network where the corresponding user terminal 100 mainly resides.

Next, the paging control unit 405 of the paging control apparatus 400 of the Serving Gateway 305 transmits downlink data notification to the MME 303 because the connection order of the network is LTE (or e-UTRAN) (S105).

Then, the MME 303 performs primary paging with the eNodeB 301 (S107), and the eNodeB 301 performs primary paging with the user terminal 100 (S109).

On the other hand, the determination unit 403 of the paging control apparatus 400 of the Serving Gateway 305 determines whether a response to the primary paging is received when the timer is activated immediately after the step S105 and the timer expires (S111) S113).

The paging control unit 405 of the paging control apparatus 400 of the Serving Gateway 305 notifies the SGSN 205 of the downlink to the paging control unit 400 because the next priority is UTRAN (or 3G) Data notification is transmitted (S115).

Then, the SGSN 205 performs the secondary paging with the NodeB 201 (S117), and the NodeB 201 performs the secondary paging with the user terminal 100 (S119).

FIG. 5 is a flowchart illustrating a paging control method according to another embodiment of FIGS. 2 and 3. FIG. At this time, the paging control method for the subscriber B in Table 1 will be described.

5, when the PDN gateway 307 transmits downlink data to the Serving Gateway 305 (S201), the receiving unit 401 of the paging control device 400 of the Serving Gateway 305 transmits downlink data .

Next, the paging control unit 405 of the paging control apparatus 400 of the Serving Gateway 305 checks the Dedicated Priority from the subscriber information of the user terminal 100 from the HSS 311 (S203).

Next, the paging control unit 405 of the paging control apparatus 400 of the Serving Gateway 305 transmits the downlink data notification to the SGSN 205 because the UTRAN (or 3G) is firstly set as the connection order of the network ( S205).

Then, the SGSN 205 performs primary paging with the NodeB 201 (S207), and the NodeB 201 performs primary paging with the user terminal 100 (S209).

On the other hand, the determination unit 403 of the paging control apparatus 400 of the Serving Gateway 305 determines whether a response to the primary paging is received when the timer is activated immediately after the step S205 and the timer expires (S211) S213).

The paging control unit 405 of the paging control apparatus 400 of the Serving Gateway 305 notifies the MME 303 that the paging control unit 405 of the Serving Gateway 305 has the next priority because the next priority is LTE (or e-UTRAN) And transmits a downlink data notification (S215).

The MME 303 performs the secondary paging with the eNodeB 301 (S217) and the eNodeB 301 performs the secondary paging with the user terminal 100 (S219).

FIG. 6 shows a configuration of a communication system according to another embodiment of the present invention to which FIG. 1 is applied.

Referring to FIG. 6, the communication system includes a user terminal 100, a UTRAN (3G) system 200, and an LTE system 300, and is the same as the configuration of FIG. However, the SGSN 205 is connected to the MME 303 and the PDN gateway 307.

At this time, the MME 303 includes a paging control device for controlling paging according to the Dedicated Priority. Here, the paging control device may be in the form of a function or a module to be additionally installed in the Serving Gateway 305, and may be in the form of hardware or software, or a combination of hardware and software.

7 is a block diagram showing the configuration of the paging control apparatus of the MME of Fig.

Referring to FIG. 7, the paging control apparatus 500 of the MME includes a receiving unit 501, a determining unit 503, and a paging controlling unit 505.

Now, the operation of the paging control apparatus 500 of this MME will be described with reference to Figs. 8 and 9. Fig.

FIG. 8 is a flowchart illustrating a paging control method according to an embodiment of FIGS. 6 and 7. Referring to FIG. At this time, a paging control method for the subscriber A in Table 1 will be described.

Referring to FIG. 8, the PDN gateway 307 transmits downlink data to the Serving Gateway 305 (S301).

Next, the Serving Gateway 305 transmits a downlink data notification to the MME 303 (S303). Then, the receiving section 501 of the paging control apparatus 500 of the MME 303 receives the downlink data notification.

Next, the paging control unit 505 of the paging control apparatus 500 of the MME 303 confirms the Dedicated Priority from the subscriber information of the user terminal 100 from the HSS 311 (S305).

Next, the paging control unit 505 of the paging control apparatus 500 of the MME 303 first performs the primary paging with the eNodeB 301 because the connection order of the network is LTE (or e-UTRAN) ), And the eNodeB 301 performs primary paging with the user terminal 100 (S309).

On the other hand, the determination unit 503 of the paging control apparatus 500 of the MME 303 determines whether a response to the primary paging is received when the timer is driven and the timer expires immediately after step S305 (S313 ).

If the response to the primary paging is not received, the paging control unit 505 of the paging control apparatus 500 of the MME 303 transmits the secondary paging message to the SGSN 205 because the next priority is UTRAN (or 3G) (S315).

Then, the SGSN 205 performs secondary paging with the NodeB 201 (S317), and the NodeB 201 performs secondary paging with the user terminal 100 (S319).

Next, FIG. 9 is a flowchart illustrating a paging control method according to another embodiment of FIGS. 6 and 7. FIG. At this time, the paging control method for the subscriber B in Table 1 will be described.

Referring to FIG. 9, the PDN gateway 307 transmits downlink data to the Serving Gateway 305 (S401).

Next, the Serving Gateway 305 transmits a downlink data notification to the MME 303 (S403). Then, the receiving section 501 of the paging control apparatus 500 of the MME 303 receives the downlink data notification.

Next, the paging control unit 505 of the paging control apparatus 500 of the MME 303 confirms the Dedicated Priority from the subscriber information of the user terminal 100 from the HSS 311 (S405).

Next, the paging control unit 505 of the paging control apparatus 500 of the MME 303 performs the primary paging to the SGSN 205 since the UTRAN (or 3G) is firstly set as the connection order of the network (S407) .

Then, the SGSN 205 performs primary paging with the NodeB 201 (S409), and the NodeB 201 performs primary paging with the user terminal 100 (S411).

On the other hand, the determination unit 503 of the paging control apparatus 500 of the MME 303 determines whether a response to the primary paging is received when the timer is driven immediately after step S407 and the timer expires (S413) ).

If the response to the primary paging is not received, the paging control unit 505 of the paging control apparatus 500 of the MME 303 sets the paging control unit 505 of the eNodeB 301 to 2 (e-UTRAN) (S417), and the eNodeB (301) performs secondary paging with the user terminal (400) (S419).

The paging control apparatus 400 of the SGSN 205 or the paging control apparatus 500 of the MME 303 maintains the primary priority according to the dedicated priority when downlink data is generated in the user terminal 100 It uses the information of the network to perform priority paging on the network, and if there is no response, paging to another network of the second priority.

The embodiments of the present invention described above are not implemented only by the apparatus and method, but may be implemented through a program for realizing the function corresponding to the configuration of the embodiment of the present invention or a recording medium on which the program is recorded.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, It belongs to the scope of right.

Claims (14)

A storage unit for storing priority information of a network in which an idle subscriber terminal first accesses among the plurality of different networks in a service area in which a plurality of different networks are hierarchically overlapped; And
And a paging controller for determining paging from a network having a higher priority than the plurality of different networks based on the priority information,
The service area includes:
The service area of the first network and the service area of the second network, which are different from each other in the radio access technology, overlap each other, and the subscriber terminal has already registered in the first network and the second network, The location registration is not performed again when moving between the service area of the first network and the service area of the second network,
The priority information may include:
Wherein the subscriber terminal is set based on a subscription fee. The method according to claim 1,
Further comprising a determination unit that determines whether a paging response is received from a first network having a higher priority,
The paging control unit,
And when the paging response is not received, determining paging to a second network of the next priority. 3. The method of claim 2,
Wherein,
Wherein the paging control unit determines whether a paging response is received from the first network when the timer expires by driving a timer. delete 3. The method of claim 2,
Wherein the service area of the first network is wider than the service area of the second network and overlaps the service area of the at least one second network,
Wherein the service area of the first network and the service area of the at least one second network,
Each comprising a plurality of cells. delete A home subscriber server for storing priority information of a network in which an idle subscriber station first accesses among a plurality of different networks in a service area where a plurality of different networks are hierarchically overlapped; And
And a serving gateway for receiving the downlink data and selecting the network to which the priority information is to be preferentially paged for the downlink data and for transmitting the downlink data notification to the selected network,
The service area includes:
The service area of the first network and the service area of the second network, which are different from each other in the radio access technology, overlap each other, and the subscriber terminal has already registered in the first network and the second network, The location registration is not performed again when moving between the service area of the first network and the service area of the second network,
The priority information may include:
Wherein the subscriber terminal is set based on a subscription plan. 8. The method of claim 7,
The serving gateway,
Determining whether a paging response is received after transmitting the downlink data notification to a first higher priority network; and if the paging response is not received, transmitting the downlink data notification to a second higher priority network A communication system performing. 9. The method of claim 8,
The serving gateway,
Wherein the mobile station determines whether the paging response is received when the timer expires and after the transmission of the downlink data notification to the first network of higher priority. 10. The method of claim 9,
A mobility management object for performing paging with the subscriber terminal when the downlink data notification is received from the serving gateway; And
Further comprising a packet switching support node for performing paging to the subscriber terminal when the downlink data notification is received from the serving gateway,
The serving gateway,
Transmitting the downlink data notification to the packet switched support node when the Universal Terrestrial Radio Access Network (UTRAN) is the highest priority, and transmitting the downlink data notification to the mobility managed object if the paging response is not received And transmitting the downlink data notification to the mobility management object when the e-UTRAN (Evolved Universal Terrestrial Radio Access Network) has the highest priority, and if the paging response is not received, Link data notification. A home subscriber server for storing priority information of a network in which an idle subscriber station first accesses among a plurality of different networks in a service area where a plurality of different networks are hierarchically overlapped;
A serving gateway for transmitting downlink data notification when downlink data is received; And
And a mobility management object for receiving the downlink data notification and selecting the network to which the paging for the downlink data is preferentially performed by checking the priority information and performing paging with the selected network,
The service area includes:
The service area of the first network and the service area of the second network, which are different from each other in the radio access technology, overlap each other, and the subscriber terminal has already registered in the first network and the second network, The location registration is not performed again when moving between the service area of the first network and the service area of the second network,
The priority information may include:
Wherein the subscriber terminal is set based on a subscription plan. 12. The method of claim 11,
The mobility management object comprising:
And performs paging to a second network having a higher priority if the paging response is not received by determining whether a paging response is received. 13. The method of claim 12,
The mobility management object comprising:
Wherein the mobile station determines whether the paging response is received upon expiration of the timer after the paging to the first network having the higher priority. 14. The method of claim 13,
Further comprising a packet switching support node for performing paging to the subscriber station when a paging request is received from the mobility managed object,
The mobility management object comprising:
The UTRAN performs paging with the packet switching support node when the UTRAN has the highest priority, performs paging with the subscriber station if a paging response is not received, and performs paging with the Evolved Universal Terrestrial Wherein the mobile station performs paging with the subscriber station when the radio access network has the highest priority and performs paging with the packet switching support node when the paging response is not received.

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