KR101890887B1 - Apparatus and method for processing overlapped paging signal on epc network - Google Patents

Abstract

In the present invention, when packet paging is transmitted to the MME of the EPC network and packet paging is transmitted from the MME to the eNodeB in the EPC network, when voice paging using the CSFB is received in a superimposed manner, After the terminal device responds to the packet paging for a predetermined time and becomes active, the notification message informing the reception of the voice call is transmitted to the terminal device, so that even if the packet paging and the voice paging overlap, Thereby enabling more stable voice service in the EPC network.

Description

[0001] APPARATUS AND METHOD FOR PROCESSING OVERLAPPED PAGING SIGNAL ON EPC NETWORK [

The present invention relates to a circuit switched fallback (CSFB) voice service in conjunction with WCDMA in an EPC (Evolved Packet Core) network, and more particularly, to a CSFB voice service associated with WCDMA in an EPC network, When packet paging (PS paging) is introduced into the MME (Mobility Management Entity) and packet paging is transmitted from the MME to the eNodeB, when the CS paging using CSFB is overlapped and received, the MME buffers the voice paging for a predetermined time buffering), and after the terminal device responds to the packet paging and becomes an active state, a message informing the inflow of the voice call is transmitted to the terminal device, thereby preventing the voice paging from being failed. In the EPC network, Processing apparatus and method.

A 3rd Generation Partnership Project (3GPP) mobile communication system based on WCDMA (Wideband Code Division Multiple Access) radio access technology is widely deployed all over the world. HSDPA (High Speed Downlink Packet Access), which can be defined as the first evolutionary phase of WCDMA, provides 3GPP mobile communication system with highly competitive wireless access technology in the mid-term future.

However, as the requirements and expectations of users and operators continue to increase and competition for developing wireless access technologies continues, there is a need to evolve new technologies in 3GPP mobile communication systems in order to gain competitiveness in the future. Reduced cost per bit, increased service availability, the use of flexible frequency bands, simple structure and open interfaces, and proper power consumption of terminals are becoming a requirement. In addition, prevention of unnecessary latency at the network node and efficient use of network resources can also promote the technology evolution in 3GPP.

In 3GPP Release 8, a Network Architecture called Evolved Packet Core (EPC) is described as one of mobile communication systems for meeting the above-mentioned requirements. EPC is a set of network nodes for 3GPP LTE (Long Term Evolution) system. The EPC evolves the core network of the existing 3GPP system architecture to support Evolved-UMTS Terrestrial Radio Access Network (E-UTRAN), which is an evolved RAN, And has an efficient network structure that simplifies the network node.

Meanwhile, as described above, EPC or LTE, which is a fourth generation mobile communication, must implement IMS-based VOIP technology in order to provide a voice service as a base of a mobile communication service as a data-only network.

However, due to issues such as lack of completeness of VOIP technology, initial LTE network investment scale, cannibalization of existing mobile voice call import model according to VOIP adoption, WCDMA A circuit switched fallback (CSFB) technique is used to transition to the network and receive service.

FIG. 1 illustrates a concept of voice paging failure due to overlapping of packet phasing and voice paging in an EPC network.

First, the idle state of the terminal device 100 indicates a state where session information is present but the access resource is released in a core network. It means that the resources are allocated.

At this time, when the terminal device 100 is in an active state, it is in a state of being matched to the network, and therefore paging is not required, and paging is performed only when the terminal device 100 is idle.

That is, when a voice call using the CSFB is input from the MSC 106 when the terminal device 100 is active, the MME 104 does not perform any paging to the terminal device 100, And notifies the terminal device 100 of the incoming voice call incoming by transmitting a notification message.

(Patent Literature)

Korean Patent Publication No. 10-2011-0056230 discloses a method and apparatus for interworking between heterogeneous network systems.

However, when the terminal apparatus 100 is in the idle state, the packet phasing flows first to the MME 104 through the PDN-GW 110 and the S-GW 108, and the MME 104 transmits the eNodeB 102, the voice paging from the MSC 106 of the WCDMA network via the CSFB may be duplicated and introduced into the MME 104. [

In this case, since the eNodeB 102 can not distinguish the type of paging, when the voice paging is transmitted from the MME 104 to the eNodeB 102, The paging is ignored and the voice paging fails.

Accordingly, in the CSFB voice service associated with WCDMA in the EPC network, when the packet phasing is inputted to the MME of the EPC network and the packet phasing is transmitted from the MME to the eNodeB, when the voice paging using the CSFB is overlapped and received, An EPC network which prevents voice paging from being failed by transmitting a notification message informing the inflow of a voice call to the terminal apparatus after the terminal apparatus responds to the packet paging and becomes active after buffering the voice paging for a predetermined time, To provide a redundant paging processing apparatus and method.

The present invention relates to a redundant paging processing apparatus in an EPC network, the apparatus comprising: a network connection unit for receiving voice paging for a CSFB from a MSC of a WCDMA network or packet phasing from an EPC network; a paging unit for transmitting the voice paging or packet paging to the terminal apparatus; Wherein when the voice paging is received from the MSC while the packet paging is being transmitted to the terminal apparatus through the paging transmission unit, And a controller for buffering the paging for a predetermined time and providing the reception of the voice paging to the terminal.

In addition, the control unit may transmit a notification message notifying the reception of the voice paging message after the terminal apparatus becomes active through the packet paging.

In addition, when the voice paging is received from the MSC before the packet paging is completed, the controller buffers the voice paging until completion of the packet paging, and after receiving the voice paging And a notification message informing of the fact is transmitted.

The controller may check the status of the terminal when the packet paging is received, and transmit the packet paging if the terminal is in an idle state.

The predetermined time may be in the range of 0.1 to 10 seconds.

The present invention also provides a method of redundant paging in an EPC network, the method comprising: transmitting packet paging to a corresponding terminal when receiving packet paging in an MME of an EPC network; and performing voice paging from a WCDMA network during transmission of the packet paging The method comprising the steps of: buffering the voice paging for a predetermined time in the MME when the MME receives the voice paging message in a redundant manner; and when the packet paging is completed, transmitting a notification message informing the reception of the voice paging through the WCDMA network .

The step of buffering the voice paging may further include receiving the voice paging upon receipt of a voice call through the CSFB from the WCDMA network in the MME, And buffering the voice paging for a predetermined time in the MME when the voice paging is received in duplicate during transmission of the packet paging.

In addition, the notification message is transmitted after the terminal device is brought into an active state through the packet paging.

In addition, in the step of transmitting the packet paging, the MME inspects the state of the terminal apparatus upon receiving the packet paging, and transmits the packet paging when the terminal apparatus is in an idle state.

The predetermined time may be in the range of 0.1 to 10 seconds.

In the present invention, when packet paging is transmitted to the MME of the EPC network and packet paging is transmitted from the MME to the eNodeB in the EPC network, when voice paging using the CSFB is received in a superimposed manner, After the terminal device responds to the packet paging for a predetermined time and becomes active, the notification message informing the inflow of the voice call is transmitted to the terminal device so that even if the packet paging and the voice paging overlap, It is possible to provide a more stable voice service in the EPC network.

1 is a conceptual diagram of voice paging failure due to overlapping of packet phasing and voice paging in an EPC network,
FIG. 2 is a network configuration diagram of a heterogeneous mobile communication hybrid system using a WCDMA network and an EPC network, to which an embodiment of the present invention is applied,
3 is a detailed block diagram of an MME according to an embodiment of the present invention.
4 is a flowchart of an operation control process of redundant paging in an MME of an EPC network according to an embodiment of the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS The advantages and features of the present invention, and the manner of achieving them, will be apparent from and elucidated with reference to the embodiments described hereinafter in conjunction with the accompanying drawings. The present invention may, however, be embodied in many different forms and should not be construed as being limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of the invention to those skilled in the art. Is provided to fully convey the scope of the invention to those skilled in the art, and the invention is only defined by the scope of the claims. Like reference numerals refer to like elements throughout the specification.

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 in the embodiments of the present invention, which may vary depending on the intention of the user, the intention or the custom of the operator. Therefore, the definition should be based on the contents throughout this specification.

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

FIG. 2 is a network configuration diagram of a hybrid mobile communication system using a WCDMA network and an EPC network, to which an embodiment of the present invention is applied.

In FIG. 2, reference numerals 210 to 280 denote WCDMA networks, and reference numerals 310 to 380 denote EPC networks.

The WCDMA network includes a NodeB 210, an RNC (Radio Network Controller) 220, an SGSN 230, an HLR 240, a GGSN 250, a Charging Gateway 260, an MSC / VLR (Mobile Switching Center / A Visitor Location Register) 270, an SMSC (Short Message Service Center) 280, and the like.

Here, the Node B 210 and the RNC 220 correspond to a radio access network area, and the SGSN 230 and the GGSN 250 correspond to a packet-switched core network.

The HLR 240 is a line-based subscriber information database that stores a service profile related to information of a mobile communication subscriber. The HLR 240 is a subscriber information database that stores a MIN, a Mobile Identification Number (ESN) Number) and service type to store subscriber information.

The MSC 270 stores visitor location information, performs switching control for voice communication, and provides a connection function between various other devices and an external network.

Also, the MSC 270 transmits a paging signal for voice service using the CSFB to a terminal device belonging to the EPC network through interworking between the WCDAM network and the EPC network.

The SMSC 280 provides a short message service, which is less relevant to data call handling in accordance with the practice of the present invention, but is illustrated for reference purposes.

In the wireless access network area, a function of providing a high-speed packet data service by efficiently using limited radio resources and satisfying various QoS (Quality of Service) requirements in a multimedia system is performed.

The SGSN 230 and the GGSN 250 belonging to the packet-switched core network region exchange IP-based protocols for matching with a PDN (Packet Data Network) 410 such as the Internet to receive the packet- .

For this, the SGSN 230 is connected to various RNCs 220 to manage the mobility of the subscriber terminal device 110 and packet session management. The SGSN 230 establishes a PDP context with the GGSN 250, And transfers the protocol data unit using the protocol data unit. Also, the SGSN 230 can perform IP routing and can perform an interaction such as location registration of the terminal device 110. [

When a data call is requested from the terminal device 110, the SGSN 230 requests the subscriber profile from the HLR 240, receives the subscriber profile including the charge information from the HLR 240, A WCDMA network, or an EPC network. The terminal device 110 transmits a data call message to the GGSN 250 when the terminal device 110 is a WCDMA network subscriber. In the case of an EPC network subscriber, charge plan information is stored in the form of a provision value and a preset value by the HLR 240, and a data call message is transmitted to the PDN GW 350 of the EPC network.

The GGSN 250 is a gateway that directly connects to the PDN 410, maintains routing information with the SGSN 230 and the external network, and performs tunneling and IP routing functions. Meanwhile, the GGSN 250 establishes an accounting data delivery message or an accounting request message including the radio resource use time information and the usage amount information of the terminal device 110 and transmits the accounting request message to the CG 260. Also, the GGSN 250 allocates an IP to the terminal device 110 according to the data call message transmitted from the SGSN 230.

The EPC network includes an eNodeB 310, an S-GW 320, an MME 330, an HSS 340, a PDN GW 350, a policy and charging rule function (PCRF) 360, an OFCS (OFline Charging System) , An Online Charging Server (OCS) 380, and the like.

The eNodeB 310 is a device for supporting next generation technologies and services such as LTE, and includes radio frequency (RF) transmission of transmission signals, signal strength and quality measurement, baseband signal processing, and channel card resource management .

The S-GW 320 is a session control and user plane node that processes payload traffic according to a set session. The S-GW 320 interworks with the eNodeB 310 through the S1-U interface, Over, and sets PDN GW 350 and an evolved packet system bearer (EPS bearer), and delivers PDU (Packet Data Unit) using tunneling.

The PDN-GW 350 allocates the IP of the terminal device 110 and performs session control and interworking with the external Internet network and the non-3GPP network as the user plane, and transmits the S-GW 320 and the external network and routing information And has tunneling and IP routing functions. It also delivers the PDU to the S-GW 320 and the external network.

The MME 330 is a node for managing subscriber information and mobility of the terminal device 110, and is responsible for session management, idle subscriber management, paging, and subscriber authentication functions. That is, the MME 330 processes a control signal when there is a binding request from the terminal device 110 or another network node, for example, the PDN GW 350 or the S-GW 320, or a radio bearer setup request And performs functions such as configuration of an EPS bearer or an IP tunnel and mobility management.

Meanwhile, in the CSFB voice service connected with WCDMA in the EPC network, packet paging is first performed by the MME 330 through the PDN-GW 350 and the S-GW 320 in the idle state as shown in FIG. When the MME 330 receives the voice paging from the MSC 270 of the WCDMA network through the CSFB to the MME 330 in a state where the MME 330 transmits packet paging to the eNodeB 310, Since the eNodeB 310 can not distinguish the kind of paging by transmitting the voice paging to the eNodeB 310, the voice paging that is overlapped with the packet paging is failed.

Accordingly, the MME 330 receives packet paging through the PDN-GW 350 and the S-GW 320 and transmits packet paging to the eNodeB 310. The MME 330 receives the packet paging from the MSC 270 of the WCDMA network In the case where voice (CS) paging using the CSFB is received in a superposed manner, after voice paging is buffered for a predetermined time, after the terminal device 200 responds to packet paging and becomes active, To the terminal device 200 so as to prevent the voice paging from being failed.

The HSS 340 is a network node including a data base including subscriber information on the wireless communication system. The HSS 340 stores profile information, authentication and location related data of a service subscriber, The MME 330 transmits the subscriber profile including the payment plan information to the MME 330 at the request of the subscriber 330.

The PCRF 360 provides a dynamic QoS and a charging rule according to a service data flow to perform a communication policy and a charging process in the communication network.

The OCS 380 receives a billing information of a subscriber requiring real-time billing information and provides a credit management function such as a limit service. Then, the EPC GW (Evolved Packet Core GateWay) generates billing information of a packet flow based on the billing information provided by the OCS 380.

The OFCS 370 collects the billing information generated by the EPC GW and processes the billing data requested by the BS (billing system) and transmits the billing data. In addition, OFCS 370 accepts various billing protocols such as Radius, Diameter, GTPP, and provides unified BS interface.

3 shows a detailed block configuration of the MME 330 according to an embodiment of the present invention. The MME 330 includes a network connection unit 450, a paging transmission unit 452, a memory unit 456, a control unit 454 ) And the like.

Hereinafter, operation of each component of the MME 330 of the present invention will be described in detail with reference to FIG.

The network connection unit 450 interfaces the transmission / reception data between the eNodeB 310, the S-GW 320, the HSS 340, the MSC / VLR 270, and the like in the EPC network.

The paging transmitting unit 452 transmits a voice paging signal for the CSFB or a packet paging signal for data communication to the terminal device through the eNodeB 310 under the control of the controller 454. [

The memory unit 456 stores a program for the operation of the MME 330. [

The control unit 454 controls the overall operation of the MME 330 according to a program stored in the memory unit 456. In addition, according to an embodiment of the present invention, when packet paging is transmitted through the PDN-GW 350 and the S-GW 320 and packet paging is transmitted to the eNodeB 310, the MSC 270 of the WCDMA network (CS) paging using the CSFB is received and overlapped, the voice paging is buffered for a predetermined time, and after the terminal device 200 responds to packet paging and becomes active, The voice message is transmitted to the terminal device 200 so that the voice phasing can be prevented from being failed.

4 is a flowchart illustrating an operation control operation of the MME 330 for stable processing of voice paging when CSFB voice paging and packet paging are duplicated in an EPC network according to an embodiment of the present invention. Hereinafter, embodiments of the present invention will be described in detail with reference to FIGS. 2, 3, and 4. FIG.

First, when packet paging is introduced into the corresponding terminal 200 through the PDN-GW 350 and the S-GW 320 in the idle state of the terminal 200, the MME 330 The terminal device 200 is idle and transmits packet paging to the terminal device 200 through the eNodeB 310 to make the terminal device 200 active (S402).

Meanwhile, in a state where the MME 330 transmits packet paging to the eNodeB 310, there may occur a case where voice paging from the MSC 270 of the WCDMA network is repeatedly introduced into the MME 330 through the CSFB .

In this case, when the voice paging is transmitted to the eNodeB 310 in the MME 330, the eNodeB 310 can not distinguish the type of paging. Therefore, Paging is ignored and voice phasing fails.

Accordingly, when the voice paging from the MSC 270 of the WCDMA network is redundantly introduced into the MME 330 through the CSFB in the state of transmitting the packet paging to the eNodeB 310 in step S404, The voice paging is not transmitted to the eNodeB 310 but is buffered until packet paging is completed (S406).

Then, the MME 330 checks whether packet paging is completed in the terminal device 200 (S408). If the packet paging is completed and the terminal device 200 becomes active, the MME 330 performs voice paging on the voice paging buffered The mobile station 200 transmits a notification message indicating the reception of the voice call without transmitting the voice message (S410) so that the mobile station 200 can perform the voice call through the CSFB to the WCDMA network.

As described above, according to the present invention, when packet paging is transmitted to the MME of the EPC network and the packet phasing is transmitted from the MME to the eNodeB in the overlapping paging in the EPC network, when the voice paging using the CSFB is overlapped and received, Even if the packet phasing and the voice phasing are overlapped by transmitting the notify message informing the inflow of the voice call to the terminal device after the terminal device responds to the packet paging and becomes active state after buffering the voice paging for a predetermined time, It is possible to prevent paging from being failed, thereby enabling more stable voice service in the EPC network.

While the invention has been shown and described with reference to certain embodiments thereof, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention. Accordingly, the scope of the invention should not be limited by the described embodiments but should be defined by the appended claims.

In the present invention, when packet phasing is inputted to the MME of the EPC network and packet phasing is transmitted from the MME to the eNodeB while voice paging using the CSFB is received in a superimposed manner, the MME buffers the voice paging for a predetermined time, It can be applied to an EPC network by transmitting a notification message informing reception of a voice call to a terminal device after the device has responded and become active, thereby enabling a more stable voice service.

210: NodeB 220: RNC 230: SGSN
240: HLR 250: GGSN 260: CG
270: MSC / VLR 280: SMSC 310: eNodeB
320: S-GW 330: MME 340: HSS
350: PDN-GW 360: PCRF 370: OFCS
380: OCS

Claims (8)

A network connection for receiving voice paging for the CSFB from the MSC of the WCDMA network or packet paging from the EPC network,
A paging transmission unit for transmitting the voice paging or packet paging to a terminal device,
Wherein the control unit controls the packet paging or voice paging to be transmitted to the terminal apparatus through the paging transmission unit and when the voice paging is received by the network connection unit while the packet paging is being transmitted to the terminal apparatus, A notification message for notifying the reception of the voice paging, instead of performing the transmission of the voice paging to the terminal apparatus when the terminal apparatus enters the active state by the packet paging after buffering for a predetermined time, To the terminal device
Wherein the redundant paging processing unit comprises: delete The method according to claim 1,
Wherein,
When the voice paging is received by the network connection unit before the packet paging is completed, the voice paging is buffered until completion of the packet paging, and the notification message is transmitted to the terminal device after the packet paging is completed The redundant paging processing unit in the EPC network. The method according to claim 1,
Wherein,
Wherein the terminal checks the status of the terminal device upon receiving the packet paging, and when the terminal device is in the idle state, transmits the packet paging to place the terminal device into the active state. Transmitting packet phasing from the MME to a terminal device when packet phasing is received by the MME of the EPC network;
Buffering the voice paging for a predetermined time at the MME when voice paging is received from the WCDMA network during transmission of the packet paging;
When the terminal device enters the active state by the packet paging, the MME transmits a notification message to inform the reception of the voice paging to the terminal device, instead of performing the transmission of the voice paging message from the MME to the terminal device. ≪ / RTI >
The method comprising the steps of: 6. The method of claim 5,
Wherein the buffering comprises:
Receiving the voice paging upon receipt of a voice call through the CSFB from the WCDMA network at the MME;
Checking at the MME whether the voice phasing is received during transmission of the packet paging;
Buffering said voice paging for a predetermined time at said MME if said voice phasing is received during transmission of said packet paging;
Wherein the redundant paging processing is performed in the EPC network. delete 6. The method of claim 5,
In the step of transmitting the packet paging to the terminal apparatus,
Wherein the MME checks the status of the terminal when receiving the packet paging and when the terminal is in an idle state, the MME transmits the packet paging to place the terminal in the active state. .

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