KR101546754B1 - - / method and system for idle mode signalling reduction of ue moving between packet switching domain and circuit switching domain - Google Patents

Abstract

The present invention relates to a mobile communication network, and more particularly, to a mobility control method in a sleep state of a GAN terminal in an LTE mobile communication network and a GSM / WCDMA mobile communication network, and a mobile communication network therefor. The mobile communication network supporting the GAN terminal according to the present invention changes the RAT (Radio Access Technology) without transmitting the location information of the terminal to the mobile communication core network and transmits the received call received in the circuit switching domain through the packet switching domain A GAN controller for receiving a Paging message for an IP packet and responding through a circuit switching domain, a GAN controller for transmitting a Paging message for an incoming call received in the circuit switching domain to a packet switching domain, an E-UTRAN or a GERAN / An EPS network for transmitting a Paging message through the UTRAN, and a GERAN / UTRAN network for receiving a Paging response message transmitted from the terminal and delivering the Paging response message to the MSC.

GAN, EPS, MSC, CS, ISR

Description

TECHNICAL FIELD [0001] The present invention relates to a method and system for reducing signaling occurring when a GAN terminal moves between an E-UTRAN network and a GERAN / UTRAN network.

The present invention relates to a mobile communication network, and more particularly, to a method and system for minimizing signaling of a location registration signal or the like that a terminal must transmit to a mobile communication network when moving between different mobile communication networks. That is, in an Evolved Packet System (EPS) network that provides voice service through a GAN (Generic Access Network), the Evolved UMTS Radio Access Network (E-UTRAN) and the GERAN (GPRS / EDGE Radio Access Network) / UTRAN UTRAN network and a GERAN / UTRAN network in a state where a terminal simultaneously supporting the GAN controller is registered in the GAN controller, it is possible to transmit the location registration message and the GAN registration / release message to the EPS network, And to provide a method and system for enabling a call to be received.

A generic access network (GAN) is a system formerly called an unlicensed mobile access (UMA) network. The system allows the terminal to seamlessly handover between the cellular network and the IP access network without transmitting or transmitting both voice, data, or both voice and data. That is, the GAN system allows mobile phone users to use the advantages of a fixed broadband network.

The GAN system includes a GAN controller as an architectural component in the GERAN / UTRAN network. The GAN controller is functionally identical to the base station controller (BSC) of a general network. However, unlike a general base station controller, the GAN controller is connected to an IP access network at the front end and communicates with the terminal through the interface (called an Up interface) using a GAN dedicated protocol. The GAN controller is responsible for converting the up interface messaging to the existing BSC / core network interface protocol so that signaling and user data can be transmitted between the terminal and the network.

1 is a block diagram illustrating a circuit switching domain including a packet switching domain (or 'PS domain') including a conventional GAN controller (GANC) and a Mobile Switching Center (MSC) Or " CS domain ", the same applies hereinafter).

1, a user equipment (UE) 110 is connected to a telephone call service in an Internet Protocol (IP) network.

Reference numerals 101, 103, and 105 denote a core network (Non-Access Stratum) and an access network that evolved from GPRS / UMTS (General Packet Radio Service / Universal Mobile Telecommunications System) (Access Network, Access Stratum).

An enhanced Node B (hereinafter, eNB) 101 manages wireless connection.

A Mobility Management Entity (MME) 103 is responsible for authentication and registration of the UE 110 when the UE 110 accesses the mobile communication network, processes the service request from the UE 110, (110) moves between the eNBs (101).

A Serving Gateway (SGW) 105 provides a bearer service for delivering user service data such as voice information to the eNB 101.

A packet data network gateway (PDN GW) 105 allocates an IP address to a UE 110 connected to a mobile communication network and provides IP connectivity. The PDN GW 105 on the IP network performs the same operation as a general IP router.

The Serving GPRS Service Node (SGSN) 107 is responsible for authentication and registration of the UE 110 when the UE 110 accesses the mobile communication network via the GERAN / UTRAN network, processes the service request from the UE 110, And guarantees mobility when UE 110 moves between BSs or Node Bs.

A radio network subsystem (RNS) or a base station subsystem (BSS) 111 includes a base station (NodeB) responsible for radio connection in the UTRAN network and a radio network controller (Hereinafter referred to as "RNC") or a GERAN base station (hereinafter, referred to as "BS") for wireless connection in a GERAN network and a base station controller for managing the BS.

A Mobile Switching Center (hereinafter, referred to as MSC) 115 is a telephone exchange for providing a handover of a circuit-switched call, mobility management, and GSM service to a mobile terminal device. This service includes voice, data, FAX, and SMS.

A home subscriber server (HSS) 109 stores subscription information and authentication information of a subscriber. The subscriber can access the mobile switching center 115 or the SGSN 107 or the mobility management entity (103).

The GANC 117 is a device for converting the signaling so that the UE 110 connected through a general IP access network rather than the cellular network can communicate with the mobile communication network. The GANC 117 is functionally identical to a base station controller (BSC) of a general GERAN network or a radio network controller (RNC) of a UTRAN network. However, unlike the BSC / RNC, the GANC 117 is connected to the terminal device via the IP access network and communicates with the terminal device via the GAN-specific protocol.

A wireless LAN (Wireless LAN or WiFi) is generally used as an example of an IP access network to which the GANC 117 is applied, but FIG. 1 shows an example of using an evolved packet system (EPS) as an IP access network have. The GANC 117 includes a Security Gateway (SEGW) 119 that provides a decoded communication channel to maintain communication confidentiality between the UE 110 and the GANC.

FIG. 2 is a diagram illustrating signaling for a procedure in which a GAN terminal UE registered in the GANC 117 receives an incoming call received by the MSC 115. FIG.

In step 201, when there is an incoming call to the UE 110, the MSC 115 transmits a paging message (hereinafter referred to as a 'paging message') to the GANC 117 to which the UE 110 is registered send.

The GANC 117 receives the paging message transmitted from the MSC 115 in step 203 and transmits a paging request message to the UE 110 via a secure IP connection established with the UE 110 (Or 'GA-CSR PAGING REQUEST message', hereinafter the same). This is to request to change the dormant UE 110 to a state in which communication is possible.

In step 205, the UE 110 responds by sending a paging response message (or a 'GA-CSR PAGING RESPONSE message', hereinafter the same) to the GANC 117. In step 207, the GANC 117 transmits a paging response message received from the UE 110 to the MSC 115 to inform the MSC 115 that the UE 110 is ready to communicate.

In step 209, the MSC 115 sends a SETUP message (or a 'Setup message', hereinafter the same) to the UE 110 through the GANC 117 to notify that there is an incoming call. In step 211, the UE 110 notifies the MSC 115 of the reception of an incoming call by sending an incoming call acknowledgment message (hereinafter referred to as a "Call confirmed message") to the MSC 115 via the GANC 117.

In step 213, the MSC 115 requests the GANC 117 to prepare a wireless channel for transmitting a voice signal through the Assignment Procedure. In step 215, the GANC 117 transmits and receives information for transmitting a RTP (Realtime Transport Protocol) packet, which is a voice signal, with the UE 110 (RTP stream setup). In step 217, the UE 110 notifies the user that there is an incoming call by ringing an incoming call signal, and sends an alarm message (or an Alerting message) to the MSC 115 to indicate that the user is waiting for a response. When the user receives an incoming call, in step 219, the UE 110 notifies the MSC 115 of a connection message (or a 'Connect message', hereinafter the same) to the MSC 115. Then, in step 221, the MSC 115 confirms that the call is connected. In step 223, a voice signal is finally transmitted from the UE 110 to the MSC 115. The signals exchanged between the UE 110 and the MSC 115 in steps 209 through 223 are not different from the voice call incoming method in the general CS domain.

3 is a diagram illustrating signaling for a procedure of registering and releasing to the GANC 117 when the UE 110 enters or leaves the GAN service area.

In step 301, the UE 110 moves to the service area of the GANC 117. Then, in step 303, the UE 110 queries the DNS server for the IP address of the SEGW to create a secure IP tunnel (SEGW) and acquires it. In step 305, the UE 110 generates a secure IP tunnel with the SEGW 119 using the IP address of the SEGW 110 acquired from the DNS server. In step 307, the UE 110 obtains the IP address of the GANC 117 from the DNS server of the GAN through the secure IP tunnel with the SEGW 119 generated in step 305. [

In step 309, the UE 110 sends a GAN Registration Request message (or a 'GA-RC REGISTER REQUEST REQUEST message', hereinafter the same) to the GANC 117 using the obtained IP address of the GAN controller 117, Request registration. The GAN registration request message includes a CID (Cell ID), a Location Area Id (LAI), and an International Mobile Subscriber Identity (IMSI).

The GANC 117 receiving the registration request message from the UE 110 in step 309 sends a GAN registration acceptance message (or a GA-RC REGISTER ACCEPT message, hereinafter the same) to the UE 110 in step 311, . At this time, the GA-RC REGISTER ACCEPT message includes system information about the GAN.

After the GAN service registration, the UE 110 starts a Location Area Update procedure by sending a location area update request message (or a Location Area Update Request message, hereinafter the same) to the MSC through the GANC 117 in step 313. The incoming call received by the MSC is then delivered to the UE 110 via the GANC 117.

If the UE 110 moves out of the service area of the GANC 117 in step 315, the UE 110 transmits a GAN Decommission message (or a GA-RC DEREGISTER message, hereinafter the same) in step 317 in order to cancel the GAN registration. To the GANC 117. When the GAN service registration is terminated, the UE 110 transmits a Location Area Update Request message to the MSC through the BSS or the RNS in step 319 to receive the incoming call directly from the MSC 115 via the A or Iu message of the BSS or the RNS And initiates the Location Area Update procedure. The UE 110 then receives the incoming call received by the MSC via the BSS or the RNS.

However, as shown in FIG. 1, when the GAN service is provided through the EPS network rather than the wireless LAN, the UE 110 becomes the GAN service area of the E-UTRAN network. Therefore, if the UE 110 moves from the GERAN / UTRAN network to the E-UTRAN network or from the E-UTRAN network to the GERAN / UTRAN network, the signaling as shown in FIG. 3 must be exchanged between the UE 110 and the network .

Meanwhile, the EPS network is an idle mode signaling reduction (or Idle) function that can receive an incoming call even if the UE 110 does not perform signaling with the network even when the UE 110 moves in the E-UTRAN network and the GERAN / -mode Signaling Reduction (ISR, hereinafter the same). That is, the UE 110 in which the ISR is activated can receive the incoming call from the network without informing the network of its location even if it is located in the E-UTRAN or the GERAN / UTRAN network.

Therefore, even if the UE 110 activates the ISR when the GAN service is provided in the EPS network as shown in FIG. 1, the GAN service shown in FIG. 3 is performed every time the UE 110 moves between the E-UTRAN network and the GERAN / Because of the need for signaling for registration and release, the benefits of ISRs are eliminated. To solve this problem, there is a need for a method for receiving an incoming call from the MSC without performing GAN signaling even when the terminal registered in the GANC 117 moves between the E-UTRAN network and the GERAN / UTRAN network.

The present invention relates to a method and apparatus for minimizing signaling to a mobile communication network when a UE moves from an LTE domain to a WCDMA or GSM domain in a mobile communication network for supporting voice service through a GAN service or vice versa Lt; / RTI >

The present invention provides a method and apparatus for receiving an incoming call received via a GANC when the UE is in an LTE region or a GSM / WCDMA region.

In order to solve the above-mentioned problems, a signaling reduction system for receiving an incoming call of a terminal when moving from an EPS network to a heterogeneous network providing a service through a GAN of the present invention includes a paging request message for an incoming call received in a circuit switching domain And a terminal for receiving the paging request message transmitted from the GAN controller and transmitting a paging response message through the circuit switching domain.

In order to solve the above-mentioned problems, a signaling reduction method for receiving an incoming call of a terminal when moving from an EPS network to a heterogeneous network providing a service through a GAN according to the present invention is characterized in that the GAN controller comprises: Transmitting a paging request message for the call to the packet switching domain and receiving the paging request message transmitted from the GAN controller and transmitting a paging response message through the circuit switching domain .

According to the present invention, when a UE receiving a voice call using the GANC in the LTE service area moves in the LTE service area and the WCDMA / GSM service area, it can receive the incoming call without notifying the mobile network of the changed current location .

The operation principle of the preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings. In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear. The following terms are defined in consideration of the functions of the present invention, and these may be changed according to the intention of the user, the operator, or the like. Therefore, the definition should be based on the contents throughout this specification.

In the present specification, an embodiment of the present invention will be described as an example of an Evolved Packet System (EPS) core network, which is an evolved core network based on 3GPP. However, the procedure provided by the present invention can be applied to any mobile communication network.

4 is a diagram illustrating an example of an embodiment of the present invention in which the UE 110 registered in the GANC 117 uses the ISR function of the EPS core network to transmit the WCDMA or GSM service in the LTE service area without exchanging signals with the EPS core network When receiving an incoming call received by the MSC 115 when the mobile terminal moves to the area.

In step 401 of FIG. 4, the UE 110 is registered in the GANC 117 via the EPS network, and the ISR is activated and the location is registered in both the SGSN 107 and the MME 103.

In step 402, the UE 110 moves from the E-UTRAN network, which is the currently located network, to the heterogeneous UTRAN or GERAN network. At this time, the UE 110 does not renew the location registration with the SGSN 107 because the ISR is activated. At the same time, unlike the operation of the existing GAN terminal, the UE 110 maintains the registration of the GANC 117 and does not register the location in the MSC 115 as well. As a result, when the UE 110 changes the radio from the E-UTRAN network (LTE) to the UTRAN / GERAN network (GSM / WCDMA), it does not transmit any signal to the EPS network and the GANC 117 and the MSC 115.

If the MSC 115 of the CS domain (i.e., the UTRAN / GERAN, hereinafter the same) receives the signal for the UE 110 in step 403, the MSC 115 transmits the PS domain (i.e., the E-UTRAN network, And sends a paging request message of the IP packet through the GANC 117 of the GANC 117. In step 405, the GANC 117 transmits a GA-CSR Paging Request message to the P-GW 105 in the form of an IP packet through the IP tunnel established with the UE 110. [ GW 105 receives the IP packet through the P-GW 105, the S-GW 105 transmits an IP packet to the MME 103 in steps 407 and 409 to call the UE 110 in the idle state. (Or a 'Downlink Packet Notification message', hereinafter the same) to the SGSN 107. [

The UE 110 having received the Paging message transmitted from the SGSN 107 to the UE 110 through the BSS / RNS 111 in step 411 transmits a service request message Or " Service Request message ", the same applies hereinafter). In step 415, a PS bearer for data transmission is generated.

In step 417, the S-GW 105 receives the buffered GA-CSR Paging Request message from the GANC 117 in step 405, and transmits the GA-CSR paging request message to the UE 110 in step 405. That is, the paging request message for an incoming call received in the CS domain is delivered to the UE 110 as an IP packet through the PS domain.

In step 419, the UE 110 does not transmit a CM service request message (or a 'CM service request message', hereinafter the same) as a response message to the GA-CSR Paging Request message through the GANC 117, (111) to the MSC (115). That is, the BSS / RNS 111 receiving the CM Service Request message in step 419 transmits a response message to the MSC 115 via the A / Iu-cs interface.

In step 423, the UE 110 sends a location area update message (or a 'Location Area Update message', hereinafter the same) to the MSC 115 to register its location, .

In step 425, a signaling procedure for call generation is performed between the MS 110 and the UE 110 responding to the paging request message transmitted by the MSC 115 and the MSC 115. This procedure is the same as the call origination procedure in the general CS domain. According to the above procedure, the UE 110 can receive a call received through the GANC 117 registered in the EPS network in the WCDMA / GSM service area without registering the location in the EPS network.

5 is a flowchart illustrating an operation of a UE 110 responding to a GA-CSR paging request message when the UE 110 registered in the GANC 117 receives a GA-CSR paging request message from the GANC 117 according to an embodiment of the present invention. Fig.

Referring to FIG. 5, in step 501, the UE 110 performs a registration procedure with the GANC 117. In step 503, the UE 110 receives a PS domain paging request message from the EPS network. In step 505, the UE 110 that has transmitted the paging response generates a PS bearer. Then, in step 507, the UE 110 receives the GA-CSR Paging Request message transmitted by the GANC 117 through the PS bearer generated in step 505. In step 509, if the UE 110 does not camp in the GERAN or UTRAN cell capable of the CS domain service, the GANC 117 transmits a GA-CSR Paging Response message through the PS bearer in step 511.

However, if the UE 110 is camping in the GERAN or UTRAN cell, since the CS domain service is available, the A / Iu-cs interface message is transmitted through the BSS / RNS 111 in step 513, And transmits a response message to the MSC 115.

If the MS wishes to receive an incoming call through the CS domain even after the call is terminated, the MS sends a Location Area Update request message to the MSC 115 in step 515. [ In step 517, the UE 110 and the MSC perform a CS call setup procedure through the RNS / BSS or the GANC 117 to generate a call normally.

6 is a diagram illustrating a UE 110 performing a GAN registration procedure and a location registration procedure when a UE 110 registered in the GANC 117 moves from an LTE network to a GERAN or a UTRAN network according to an embodiment of the present invention. And FIG.

Referring to FIG. 6, in step 601, the UE 110 is registered in the EPS network and is located in the LTE service area.

In step 603, the UE 110 changes the radio access technology to GERAN or UTRAN. This may occur, for example, when the UE 110 leaves the LTE coverage area or the LTE signal is weakened. If the UE 110 is in the active state of ISR in step 605, the UE 110 does not perform any operation but maintains the idle state. In other words, even if the UE 110 moves from the E-UTRAN network to the GERAN / UTRAN network, no signaling with the network occurs.

However, if the ISR is not activated in step 605, if the GAN is registered, the UE 110 releases the GAN deregistration and sends a Location Area Update request message from the GERAN or UTRAN to the MSC 115, Perform registration. Thereafter, in step 611, a routing area update (or Routing Area Update) is performed to complete the location registration in the PS domain.

However, if the UE 110 is not GAN-registered in step 607, steps 607 and 609 are omitted.

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 embodiments, but, on the contrary, Of the right.

BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 shows a mobile communication network including a PS domain including a conventional GAN controller and a CS domain including a mobile switching center.

2 is a diagram illustrating signaling for a procedure in which a GAN terminal registered in a GANC receives an incoming call received in an MSC;

3 illustrates signaling for a procedure of registering and releasing to the GANC 117 when the UE 110 enters or leaves the GAN service area.

4 illustrates signaling for when a UE 110 registered with the GANC 117 receives an incoming call received at the MSC 115, in accordance with an embodiment of the present invention.

5 is a flowchart illustrating an operation of a UE 110 responding to a GA-CSR paging request message when the UE 110 registered in the GANC 117 receives a GA-CSR paging request message from the GANC 117 according to an embodiment of the present invention. Fig.

6 is a diagram illustrating a UE 110 performing a GAN registration procedure and a location registration procedure when a UE 110 registered in the GANC 117 moves from an LTE network to a GERAN or a UTRAN network according to an embodiment of the present invention. And Fig.

Claims (14)

A method for reducing signaling of a terminal when moving from an EPS network to a heterogeneous network that provides a service through a GAN, If the radio access technology of the terminal is changed to GERAN or UTRAN, determining whether the ISR is activated, And does not perform signaling for GAN registration, GAN release, and location registration if the ISR is not active. The method according to claim 1, Further comprising the step of performing signaling for at least one of GAN registration, GAN release, and location registration with the EPS network if the ISR is activated. 3. The method of claim 2, In the GAN registration, RTI ID = 0.0 > GA-RC < / RTI > REGISTER REQUEST message. The method of claim 3, The GA-RC REGISTER REQUEST message A Cell ID (CID), a Location Area Id (LAI), and an International Mobile Subscriber Identity (IMSI). 3. The method of claim 2, The GAN- RTI ID = 0.0 > GA-RC < / RTI > DEREGISTER message. 3. The method of claim 2, In the location registration, Location Area Update request message. The method according to claim 1, Upon receiving the PS domain paging request message, generating a PS bearer; And Further comprising transmitting the CM Service Request / Paging Response message to the MSC through the A / Iu-cs interface message through the BSS / RNS. In a terminal moving from an EPS network to a heterogeneous network that provides services through a GAN, If the radio access technology of the terminal is changed to GERAN or UTRAN, it is determined whether the ISR is activated, And does not perform signaling for GAN registration, GAN release, and location registration if the ISR is not activated. 9. The method of claim 8, And performs signaling for at least one of GAN registration, GAN release, and location registration with the EPS network if the ISR is activated. 10. The method of claim 9, In the GAN registration, And transmitting a GA-RC REGISTER REQUEST message. 11. The method of claim 10, The GA-RC REGISTER REQUEST message A Cell ID (CID), a Location Area Id (LAI), and an International Mobile Subscriber Identity (IMSI). 10. The method of claim 9, The GAN- And transmitting the GA-RC DEREGISTER message. 10. The method of claim 9, In the location registration, And a Location Area Update Request message. 9. The method of claim 8, Upon receiving the PS domain paging request message, a PS bearer is generated, And transmits the CM Service Request / Paging Response message to the MSC through the A / Iu-cs interface message through the BSS / RNS.

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