KR20100064515A - Method and system for idle mode signalling reduction of ue moving between packet switching domain and circuit switching domain - Google Patents

Abstract

PURPOSE: A method and a system for reducing signaling generated when a GAN(Generic Access Network) terminal move between E-UTRAN(Evolved UMTS Radio Access Network) network and GERAN(GPRS/EDGE Radio Access Network)/UTRAN(UMTS Radio Access Network) network are provided to receive receives call received through GANC(Generic Access Network Controller) at the terminal when the terminal exists in LTE(Long Term Evolution) area or GSM(Global System for Mobile communications)/WCDMA(Wideband Code Division Multiple Access) area. CONSTITUTION: A GAN(Generic Access Network) controller(117) transmits paging request message about receiving call received to circuit switching domain to packer switching domain. The terminal(110) receives the paging request message transmitted from the GAN controller. The terminal transmits the circuit switching domain through paging response message. The terminal receives received call through the GAN controller without location registration in a EPS network from WCDMA(Wideband Code Division Multiple Access)/GSM(Global System for Mobile communications) service area.

Description

METHODS AND SYSTEM FOR IDLE MODE SIGNALLING REDUCTION OF UE MOVING BETWEEN PACKET SWITCHING DOMAIN AND CIRCUIT SWITCHING DOMAIN}

The present invention relates to a mobile communication network, and more particularly, to a method and system for minimizing signaling such as a location registration signal that a terminal should transmit to a mobile communication network when moving different mobile communication networks. In other words, E-UTRAN (Evolved UMTS Radio Access Network) and GERAN (GPRS / EDGE Radio Access Network) / UTRAN (UMTS Radio Access Network) in EPS (Evolved Packet System) networks that provide voice services through GAN (Generic Access Network) ) Is simultaneously registered in the GAN controller, and moves between the E-UTRAN network and the GERAN / UTRAN network, the call is received from any network without transmitting the location registration message and the GAN registration / release message to the EPS network. A method and system are provided that enable a call to be received.

Generic access network (GAN) is a system conventionally 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 voice, data, or both voice and data. In other words, the GAN system allows mobile phone users to take advantage of the 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 typical network. However, unlike the general base station controller, the GAN controller is connected to an IP access network, 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 into 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 circuit switching domain including a packet switching domain (or 'PS domain', hereinafter same) and a mobile switching center (MSC) including a conventional GAN controller (GANC). Or "CS domain", which is the same below).

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

Reference numerals 101, 103 and 105 refer to the core network (Core Network, Non-Access Stratum) and access network evolved from General Packet Radio Service / Universal Mobile Telecommunications System (GPRS / UMTS), the 2.5th and 3rd generation mobile communication in Europe. (Access Network, Access Stratum).

The base station 101 (hereinafter referred to as eNB) 101 manages a radio connection.

The mobility management entity (MME) 103 is responsible for authentication and registration of the UE 110 when the UE 110 accesses a mobile communication network, processes a service request from the UE 110, and receives a UE. Mobility is ensured when 110 moves between eNBs 101.

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

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

The Serving GPRS Service Node (SGSN) 107 is responsible for authentication and registration of the UE 110 when the UE 110 accesses a mobile communication network through the GERAN / UTRAN network, and processes a service request from the UE 110. Mobility is guaranteed when the UE 110 moves between BSs or NodeBs.

Radio Network Subsystem (RNS) or Base Station Subsystem (BSS) 111 is a radio network controller that manages NodeBs and NodeBs responsible for radio access in UTRAN networks. (Radio Network Controller: RNC) or GERAN base station (hereinafter referred to as BS) responsible for wireless access in the GERAN network and the base station controller for managing the BS.

Mobile Switching Center (hereinafter referred to as MSC) 115 is a telephone exchange that provides circuit terminal call processing, mobility management, and GSM services to mobile terminal devices. The service referred to here includes all voice, data, fax and SMS.

A Home Subscriber Server (hereinafter referred to as HSS) 109 stores subscriber's subscription information and authentication information, and the subscriber is a mobile switching center 115 or SGSN 107 or mobility management entity with which the subscriber is registered in the mobile communication network. The address of 103 is stored.

The GANC 117 is a device that converts signaling so that a UE 110 connected through a general IP access network, not a cellular network, can communicate with a mobile communication network. The GANC 117 is functionally identical to a base station controller (hereinafter referred to as BSC) of a general GERAN network or a radio network controller (hereinafter referred to as RNC) of a UTRAN network. Unlike the BSC / RNC, however, the GANC 117 is connected to the terminal device through an IP access network and communicates with the terminal device through a GAN dedicated protocol.

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

FIG. 2 is a diagram illustrating signaling of a procedure of receiving an incoming call received by the MSC 115 by a GAN UE registered with the GANC 117.

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

Then, the GANC 117 receives the paging message transmitted from the MSC 115 in step 203 and sends a paging request message to the UE 110 through a secure IP connection with the UE 110. (Or 'GA-CSR PAGING REQUEST message', hereinafter identical). This is to request to change the idle state of the UE 110 to a state in which communication is possible.

In step 205, the UE 110 responds by sending a paging response message (or 'GA-CSR PAGING RESPONSE message', hereinafter identical) 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 for communication.

In step 209, the MSC 115 sends a setup message (or 'Setup message', hereinafter same) to the UE 110 through the GANC 117 to inform that there is an incoming call. In step 211, the UE 110 sends an incoming call reception confirmation message (hereinafter, a 'Call confirmed message', hereinafter same) to the MSC 115 through the GANC 117 to notify that the incoming call has been received.

In step 213, the MSC 115 requests the GANC 117 to prepare a radio channel for transmitting a voice signal through an assignment procedure. Then, in step 215, the GANC 117 exchanges information with the UE 110 to transmit a Realtime Transport Protocol (RTP) packet, which is a voice signal, with the UE 110 (RTP stream setup). In step 217, the UE 110 rings an incoming signal to inform the user that there is an incoming call, and sends an alarm message (or the same as below 'Alerting message') to the MSC 115 to inform the user that the user is waiting for a response. When the user receives the incoming call, in step 219, the UE 110 sends a connection message (or 'Connect message', hereinafter same) to the MSC 115 to inform that the call is connected. The MSC 115 then determines that the call is connected in step 221. In step 223, the voice signal is finally transferred between the UE 110 and the MSC 115. Signals transmitted and received between the UE 110 and the MSC 115 in steps 209 through 223 are not different from those of a voice call 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 a service area of the GANC 117. Then, in step 303, the UE 110 queries and acquires the IP address of the SEGW to the DNS server to generate the SEGW and the secure IP tunnel (hereinafter, referred to as 'secure IP tunnel'). In step 305, the UE 110 generates a secure IP tunnel with the SEGW 119 using the IP address of the SEGW 110 obtained from the DNS server. In operation 307, the UE 110 acquires 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 operation 305.

In step 309, the UE 110 sends a GAN registration request message (or a 'GA-RC REGISTER REQUEST request message', which is the same below) to the GANC 117 using the obtained IP address of the GAN controller 117, to obtain a GAN service. 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 GA-RC REGISTER ACCEPT message, hereinafter identical) to the UE 110 in step 311 to complete the GAN service registration. Notify At this time, the GA-RC REGISTER ACCEPT message includes system information about the GAN.

After registering the GAN service, the UE 110 initiates a location area update procedure by sending a location area update request message (or location area update request message, hereinafter identical) to the MSC through the GANC 117 in step 313. The incoming call received by the MSC is then transmitted to the UE 110 through the GANC 117.

Thereafter, when the UE 110 leaves the service area of the GANC 117 in step 315, the UE 110 releases a GAN deregistration message (or GA-RC DEREGISTER message, hereinafter same) in step 317 to terminate GAN registration. Is transmitted to the GANC 117. When the GAN service registration is terminated, the UE 110 sends a Location Area Update request message to the MSC through the BSS or the RNS in step 319 to receive an incoming call directly from the MSC 115 through the A or Iu message of the BSS or the RNS. Send to initiate the Location Area Update procedure. Thereafter, the UE 110 receives an incoming call received by the MSC through BSS or RNS.

However, as shown in FIG. 1, when providing the GAN service through the EPS network instead of the WLAN, the UE 110 becomes the GAN service area of the E-UTRAN network. Therefore, even when the UE 110 moves from the GERAN / UTRAN network to the E-UTRAN network or moves out of the E-UTRAN network to the GERAN / UTRAN network, signaling as shown in FIG. 3 should be exchanged between the UE 110 and the network. .

On the other hand, the EPS network is idle mode signaling reduction (or Idle) that is a function that can receive the incoming signal even if the UE 110 does not signal with the network even when the UE 110 moves the E-UTRAN network and GERAN / UTRAN network -mode Signaling Reduction (ISR, same as below) is provided by default. That is, the UE 110 in which the ISR is activated may receive an incoming call from the network even though the E-UTRAN or the GERAN / UTRAN network is not informed of its location.

Therefore, when providing the GAN service in the EPS network as shown in FIG. 1, even if the UE 110 activates ISR, whenever the UE 110 moves between the E-UTRAN network and the GERAN / UTRAN network, the GAN shown in FIG. The gains from ISR disappear because of the need for signaling for registration and release. In order to solve this problem, even when the UE registered in the GANC 117 moves the E-UTRAN network and the GERAN / UTRAN network, there is a need for a method for receiving an incoming signal from the MSC without GAN signaling.

The present invention provides a method and apparatus for minimizing signaling with a mobile communication network in a mobile communication network for supporting a voice service through a GAN service, when the UE moves from the LTE area to the WCDMA or GSM area, or vice versa. To provide.

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

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

In addition, a signaling reduction method for receiving an incoming call of a terminal when moving from a EPS network providing a service through a GAN of the present invention to a heterogeneous network to solve the above problems is a GAN controller, the incoming call received in the circuit switching domain Transmitting a paging request message for a call to a packet switching domain, and receiving, by the terminal, the paging request message transmitted from the GAN controller, and transmitting a paging response message through the circuit switching domain. It is done.

According to the present invention, when a UE receiving a voice call using a GANC in an LTE service area moves between an LTE service area and a WCDMA / GSM service area, an incoming call can be received without notifying the mobile communication 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, detailed descriptions of well-known functions or configurations will be omitted if it is determined that the detailed description of the present invention may unnecessarily obscure the subject matter of the present invention. The following terms are defined in consideration of the functions of the present invention, and may be changed according to the intentions or customs of the user, the operator, and the like. Therefore, the definition should be made based on the contents throughout the specification.

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

FIG. 4 illustrates a WCDMA or GSM service in an LTE service area without the UE 110 registered in the GANC 117 communicating with the EPS core network using an ISR function of the EPS core network according to an embodiment of the present invention. When moving to the area, it is a diagram showing the signaling for the case of receiving the incoming call received by the MSC (115).

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

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

If the hand signal for the UE 110 is received at the MSC 115 of the CS domain (ie, UTRAN / GERAN network, which is the same below) in step 403, the MSC 115 determines the PS domain (ie, E-UTRAN network, below). Paging request message of the IP packet is sent through the GANC 117 of the same). 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 an IP tunnel connected with the UE 110. When the IP packet is received by the S-GW 105 via the P-GW 105, the S-GW 105 may communicate with the MME 103 in steps 407 and 409 to call the UE 110 in the idle state. The SGSN 107 sends a downlink packet notification message (or 'Downlink Packet Notification message', hereinafter same).

In step 411, when the SGSN 107 receives the paging message transmitted to the UE 110 through the BSS / RNS 111, the UE 110 transmits a service request message (SG) to the SGSN 107 in response to paging. Or 'Service Request message', which is the same below), and generates a PS bearer for data transmission in step 415.

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

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

In step 423, the UE 110 sends a location area update message (or 'Location Area Update message', hereinafter same), if necessary, registers the location with the MSC 115, and then directly sends the message without going through the GANC 117. To receive.

In step 425, a signaling procedure for call generation is performed between the MSC 115 and the UE 110 in response to a paging request message transmitted by the MSC 115. This procedure is the same as the call generation procedure in the general CS domain. According to the above procedure, the UE 110 may 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.

FIG. 5 illustrates an operation of the UE 110 in response to receiving a GA-CSR Paging request message from the GANC 117 registered in the GANC 117 according to an embodiment of the present invention. It is a figure which shows the flowchart concerning.

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

However, when the UE 110 camps in a GERAN or UTRAN cell, since CS domain service is possible, in step 513, CM: Service Request / Paging as an A / Iu-cs interface message through the BSS / RNS 111. The response message is transmitted to the MSC 115.

If the terminal intends to receive an incoming call through the CS domain even after the call is terminated, the UE 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 GANC 117 so that the call is normally generated.

FIG. 6 illustrates a UE 110 performing a GAN registration procedure and a location registration procedure when a UE 110 registered to a GANC 117 moves from an LTE network to a GERAN or UTRAN network according to an embodiment of the present invention. Is a flowchart showing the operation of?.

Referring to FIG. 6, in step 601, a UE 110 is registered in an EPS network and located in an 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 service area or the LTE signal is weakened. If the UE 110 is in the state where the ISR is activated in step 605, the UE 110 maintains the idle state without performing any other operation. In other words, even when the UE 110 moves from the E-UTRAN network to the GERAN / UTRAN network, no signaling with the network is performed.

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

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

Although the embodiments of the present invention have been described in detail above, the scope of the present invention is not limited thereto, and various modifications and improvements of those skilled in the art using the basic concepts of the present invention defined in the following claims are also provided. It belongs to the scope of rights.

1 is a diagram illustrating 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 of a procedure for receiving an incoming call received by an MSC from a GAN terminal registered in GANC.

FIG. 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 is a diagram illustrating signaling for a case where a UE 110 registered to a GANC 117 receives an incoming call received by the MSC 115 according to an embodiment of the present invention.

FIG. 5 illustrates an operation of the UE 110 in response to receiving a GA-CSR Paging request message from the GANC 117 registered to the GANC 117 according to an embodiment of the present invention. Diagram showing a flow chart relating to the present invention.

FIG. 6 illustrates a UE 110 performing a GAN registration procedure and a location registration procedure when a UE 110 registered to a GANC 117 moves from an LTE network to a GERAN or UTRAN network according to an embodiment of the present invention. Showing a flowchart relating to the operation of the apparatus.

Claims (2)

In a signaling reduction system for receiving an incoming call of a terminal when moving from a EPS network providing a service through a GAN to a heterogeneous network, A GAN controller for transmitting a paging request message for an incoming call received in the circuit switching domain to the packet switching domain; And And a terminal that receives the paging request message transmitted from the GAN controller and transmits a paging response message through the circuit switching domain. In the method of reducing signaling for receiving an incoming call of a terminal when moving from a EPS network providing a service through a GAN to a heterogeneous network, Sending, by the GAN controller, a paging request message for an incoming call received in the circuit switching domain to the packet switching domain; And And receiving, by the terminal, the paging request message transmitted from the GAN controller, and transmitting a paging response message through the circuit switching domain.

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