KR20130083506A - Apparatus and method for processing overlapped paging signal on epc network - Google Patents

Abstract

PURPOSE: A duplicated paging processing device in an evolved packet core (EPC) network and a processing method thereof are provided to transmit a notification message noticing the inflow of a voice call to a terminal device after being activated by controlling the terminal device to respond to packet paging. CONSTITUTION: A network connecting part (450) receives packet paging from an EPC network or voice paging for circuit switched fall back (CSFB) from a mobile switching center (MSC) of a wideband code division multiple access (WCDMA) network. A paging transmission part (452) transmits the audio paging or the packet paging to the terminal device. A control part (454) transmits the packet paging or the audio paging to the terminal device through the paging transmission unit. The control part receives the audio paging from the MSC while transmitting the packet paging to the terminal device. The control part buffers the audio paging for a predetermined period of time and notifies the reception of the audio paging to the terminal device. [Reference numerals] (450) Network connecting part; (452) Paging transmission part; (454) Control part; (456) Memory part

Description

Duplicate paging processing device and method in EPC network {APPARATUS AND METHOD FOR PROCESSING OVERLAPPED PAGING SIGNAL ON EPC NETWORK}

The present invention relates to a circuit switched fall back (CSFB) voice service associated with wideband code division multiple access (WCDMA) in an evolved packet core (EPC) network, and more particularly to a CSFB voice service linked to WCDMA in an EPC network. When packet paging is introduced into the mobility management entity (MME) and voice paging using CSFB is overlapped and received during paging from the MME to the eNodeB, the MME buffers voice paging for a certain time. After paging, duplicate paging in the EPC network that prevents voice paging from failing by sending a message indicating the inflow of voice call to the terminal after the terminal responds to packet paging becomes active state. A processing apparatus and method.

3rd Generation Partnership Project (3GPP) mobile communication systems based on Wideband Code Division Multiple Access (WCDMA) radio access technology are widely deployed around 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 interface, and adequate power consumption of the terminal are demanding requirements. 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, and cannibalization of existing mobile telephony voice call import model resulting from the introduction of VOIP, WCDMA for voice transmission or reception of LTE terminal devices proposed by 3GPP Circuit switched fallback (CSFB) technology is used to transition to the network and receive service.

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

First, an idle state of the terminal device 100 refers to a state in which core information is present in session core but access resources are released, and an active state is wireless. It means a state in which resources are allocated.

In this case, when the terminal device 100 is in an active state, it is a state that is matched to a network, and therefore, no paging is required, and the terminal device 100 performs paging only when the terminal device is in the idle state.

That is, when the terminal 100 is active, when the voice call using the CSFB flows from the MSC 106, the MME 104 does not perform separate paging from the terminal 100 to notify the voice call reception. A notification message is sent to the terminal device 100 by sending a notification message.

(Patent Literature)

Korean Laid-Open Patent Publication No. 10-2011-0056230 published on May 26, 2011, a method and apparatus for interworking between heterogeneous network systems are disclosed.

However, as shown in FIG. 1, when the terminal device 100 is idle, packet paging is first introduced into the MME 104 through the PDN-GW 110 and the S-GW 108 so that the MME 104 receives an eNodeB ( In a state in which packet paging is transmitted to the 102, voice paging from the MSC 106 of the WCDMA network through the CSFB may be repeatedly introduced into the MME 104.

In this case, when the voice paging is transmitted from the MME 104 to the eNodeB 102, the type of paging cannot be distinguished from the eNodeB 102. Therefore, the voice is repeatedly introduced in a state in which packet paging with the terminal device 100 is not completed. Paging was ignored and voice paging failed.

Therefore, in the CSFB voice service linked to WCDMA in the EPC network, when the packet paging flows into the MME of the EPC network and the packet paging is received by the CSFB while the packet paging is transmitted from the MME to the eNodeB, the MME is received by the MME. After buffering voice paging for a certain time, EPC network that prevents voice paging from failing by sending notification message notifying voice inflow to terminal device after packet device becomes active in response to packet paging. In the present invention, a redundant paging processing apparatus and method are provided.

The present invention provides a redundant paging processing apparatus in an EPC network, a network connection unit for receiving voice paging for CSFB or packet paging from an EPC network from an MSC in a WCDMA network, and a paging for transmitting the voice paging or packet paging to the terminal apparatus. When the voice paging is repeatedly received from the MSC while transmitting the packet paging or voice paging to the terminal device through the paging transmitter, and transmitting the packet paging to the terminal device, And a controller which buffers paging for a predetermined time and provides the fact that the voice paging is received to the terminal device.

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

In addition, when receiving the voice paging from the MSC before the packet paging is completed, the controller buffers the voice paging until the completion of the packet paging and receives the voice paging to the terminal device after the packet paging is completed. Characterized in that the notification message for transmitting the fact.

The controller may check the state of the corresponding terminal device when receiving the packet paging and transmit the packet paging when the terminal device is in the idle state.

In addition, the predetermined time is characterized in that the range of 0.1 to 10 seconds.

In addition, the present invention provides a method of processing redundancy paging in the EPC network, the step of transmitting the packet paging to the terminal device when receiving the packet paging in the MME of the EPC network, and voice paging from the WCDMA network during the transmission of the packet paging Buffering the voice paging for a predetermined time in the MME when duplicate reception is received; and transmitting the notification message notifying the fact that the voice paging is received through the WCDMA network from the MME to the terminal when the packet paging is completed. It includes a step.

The buffering of the voice paging may include receiving the voice paging according to the reception of the voice call through the CSFB from the WCDMA network in the MME, wherein the voice paging is repeatedly received during the transmission of the packet paging in the MME. And if the voice paging is repeatedly received during the transmission of the packet paging, buffering the voice paging for a predetermined time.

The notification message may be transmitted after the terminal apparatus becomes active through the packet paging.

In the transmitting of the packet paging, the MME checks the state of the terminal device when receiving the packet paging and transmits the packet paging when the terminal device is in the idle state.

In addition, the predetermined time is characterized in that the range of 0.1 to 10 seconds.

In the present invention, in processing duplicate paging in an EPC network, when voice paging using CSFB is overlapped while packet paging is introduced into the MME of the EPC network and the packet paging is transmitted from the MME to the eNodeB, the voice paging is performed in the MME. After buffering for a certain time, after the terminal device responds to packet paging and becomes active, voice paging fails even when packet paging and voice paging overlap by transmitting a notification message indicating a voice call inflow to the terminal device. It can be prevented to have a more stable voice service in the EPC network has the advantage.

1 is a conceptual diagram of voice paging failure due to duplication of packet paging and voice paging in an EPC network;
2 is a network configuration diagram of a heterogeneous mobile communication mixed 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 an operation control flowchart for processing 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 become apparent with reference to the embodiments described in detail below with reference to the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but can be implemented in various forms, and only the embodiments are to make the disclosure of the present invention complete, and the general knowledge in the technical field to which the present invention belongs. It is provided to fully convey the scope of the invention to those skilled in the art, and the present invention is defined only by the scope of the claims. Like reference numerals refer to like elements throughout.

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.

2 is a diagram illustrating a network configuration of a heterogeneous mobile communication mixed 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 NodeB 210, RNC (Radio Network Controller) 220, SGSN 230, HLR 240, GGSN 250, CG (Charging Gateway) 260, MSC / VLR (Mobile Switching Center / Visitor Location Register (270), Short Message Service Center (SMS) 280, and the like.

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

The HLR 240 is a line-based subscriber information database that stores a service profile of mobile subscriber information, and includes a terminal identification number (MIN) and a terminal unique number (ESN) of the terminal device 110. Number) and service type information 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.

In addition, the MSC 270 transmits a paging signal for voice service using 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 not related to data call processing according to an embodiment of the present invention, but is shown for reference.

In the radio access network area, a function of efficiently using limited radio resources is provided to provide a high speed packet data service and satisfy various quality of service (QoS) requirements in a multimedia system.

The SGSN 230 and the GGSN 250 belonging to the packet switched core network area may interwork with an IP-based protocol to match the packet data network (PDN) 410 such as the Internet so that the terminal device 110 may receive a packet switched service. To provide.

To this end, the SGSN 230 is connected to several RNCs 220 to manage the mobility and packet session management of the subscriber station 110, establish a PDP context with the GGSN 250, and perform tunneling. To carry out the protocol data unit. In addition, the SGSN 230 may perform IP routing and interact with location registration of the terminal device 110.

In addition, when a data call is requested from the terminal device 110, the SGSN 230 requests a subscriber profile from the HLR 240, receives a subscriber profile including plan information from the HLR 240, and the terminal device 110 receives the subscriber profile. It is determined based on the subscriber profile whether the subscriber is the subscriber of the WCDMA network or the EPC network, and the terminal device 110 transmits a data call message to the GGSN 250 when the terminal device 110 is a subscriber of the WCDMA network. In the case of subscribers of the EPC network, the plan information is stored in the form of provision values and preset values provided by the HLR 240, and transmits a data call message to the PDN GW 350 of the EPC network.

The GGSN 250 is a gateway that directly connects with the PDN 410 to maintain routing information between the SGSN 230 and the external network, and performs tunneling and IP routing functions. Meanwhile, the GGSN 250 sets a billing data transfer message or an accounting request including the radio resource usage time information and the usage information of the terminal device 110 and transmits the accounting request to the CG 260. In addition, the GGSN 250 allocates an IP to the terminal device 110 according to the data call message transmitted from the SGSN 230.

EPC network is eNodeB (310), S-GW (320), MME (330), HSS (340), PDN GW (350), PCRF (Policy & Charging Rule Function) (360), OFCS (OFline Charging System) (370) ), An online charging server (OCS) 380, and the like.

The eNodeB 310 is a device supporting next-generation technologies and services such as LTE, and performs functions such as radio frequency (RF) transmission and reception of signal strength and quality, baseband signal processing, and channel card resource management. To perform.

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 an S1-U interface and inter- LTE / 3GPP hand. It supports the over, configures the PDN GW 350 and EPS bearer (Evolved Packet System bearer) and delivers a packet data unit (PDU) using tunneling.

The PDN-GW 350 allocates IP of the terminal device 110 and performs routing control with the S-GW 320 and the external network for packet service as a session control and user plane that interworks with an external Internet network and a non-3GPP network. Maintains tunneling and IP routing functions. In addition, it delivers the PDU to the S-GW 320 and the external network.

The MME 330 is a node that manages 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 the control signal when there is a join request or a radio bearer setup request from the terminal device 110 or another network node such as the PDN GW 350 or the S-GW 320. It is responsible for various functions of a control plane such as a control plane, and performs functions such as setting up EPS bearer or IP tunnel and mobility management.

Meanwhile, in the CSFB voice service linked with WCDMA in the EPC network, as shown in FIG. 1, when the terminal device is idle, packet paging through the PDN-GW 350 and the S-GW 320 to the MME 330 first. When voice paging from the MSC 270 of the WCDMA network over the CSFB is introduced into the MME 330 while the MME 330 transmits packet paging to the eNodeB 310, the MME 330 When the voice paging is transmitted to the eNodeB 310, since the type of paging cannot be distinguished from the eNodeB 310, there is a problem in that voice paging introduced in duplicate with packet paging fails.

Accordingly, the MME 330 receives the packet paging through the PDN-GW 350 and the S-GW 320 and transmits the packet paging to the eNodeB 310 from the MSC 270 of the WCDMA network. When voice (CS) paging using CSFB is overlapped and received, a notification message for notifying voice call reception after buffering voice paging for a predetermined time and then responding to packet paging after the terminal apparatus 200 becomes active. By transmitting the to the terminal device 200 to prevent the voice paging fails.

The HSS 340 is a network node including a database containing subscriber information for a wireless communication system. The HSS 340 stores profile information, authentication, and location data of a service subscriber, and the HSS 340 is an MME. In response to the request of 330, the subscriber profile including the plan information is transmitted to the MME 330.

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

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

OFCS 370 collects the billing information generated by the EPC GW, processes and transmits the billing data required by the billing system (BS). In addition, OFCS 370 accommodates various charging protocols such as Radius, Diameter, and GTPP to provide a unified BS interface.

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

Hereinafter, the operation of each component of the MME 330 of the present invention will be described in detail with reference to FIG. 3.

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 MME 330 in the EPC network.

The paging transmitter 452 transmits a voice paging signal for 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 controller 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, the packet (PS) paging is introduced through the PDN-GW 350 and S-GW 320 to transmit the packet paging to the eNodeB (310) MSC (270) of the WCDMA network In the case where voice (CS) paging using CSFB is overlapped and received, buffering voice paging for a predetermined time, and notifying the voice call reception after the terminal device 200 becomes active in response to packet paging. By transmitting the application message to the terminal device 200, it is possible to prevent the voice paging fails.

4 illustrates an operation control flow in the MME 330 for stable processing of voice paging when CSFB voice paging and packet paging overlap 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 flows into the terminal device 200 through the PDN-GW 350 and the S-GW 320 in the idle state of the terminal device (UE) (S400), the MME 330 Since the terminal device 200 is in the idle state, the terminal device 200 is made active by transmitting packet paging to the terminal device 200 through the eNodeB 310 (S402).

Meanwhile, as described above, voice paging from the MSC 270 of the WCDMA network may be repeatedly introduced into the MME 330 through the CSFB while the MME 330 transmits packet paging to the eNodeB 310. .

In this case, when the voice paging is transmitted from the MME 330 to the eNodeB 310, the type of paging cannot be distinguished from the eNodeB 310. Therefore, the voice is repeatedly introduced in a state in which packet paging with the terminal device 200 is not completed. Paging is ignored and voice paging fails.

Accordingly, when the MME 330 overlaps the voice paging from the MSC 270 of the WCDMA network through the CSFB while the packet paging is transmitted to the eNodeB 310 (S404), the incoming The voice paging is not transmitted to the eNodeB 310, but is buffered until packet paging is completed (S406).

Subsequently, the MME 330 checks whether the terminal device 200 completes packet paging (S408). When the packet paging is completed and the terminal device 200 becomes active, the MME 330 performs voice paging for the voice paging that has been buffered. Instead of transmitting, a notification message for notifying the reception of the voice call is transmitted (S410) so that the terminal device 200 can perform voice reception through the CSFB to the WCDMA network.

As described above, in the present invention, in processing duplicate paging in the EPC network, when packet paging is introduced into the MME of the EPC network and voice paging using CSFB is received while transmitting packet paging from the MME to the eNodeB, the MME After buffering voice paging for a predetermined time, the terminal responds to packet paging, and after the terminal becomes active, a notification message notifying the inflow of the voice call is transmitted to the terminal, even if packet paging and voice paging overlap. Paging can be prevented from failing, enabling more stable voice service in the EPC network.

Meanwhile, in the above description of the present invention, specific embodiments have been described, but various modifications may be made without departing from the scope of the present 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 paging is introduced into the MME of the EPC network and the voice paging using the CSFB is overlapped and received while transmitting the packet paging from the MME to the eNodeB, the terminal performs the packet paging after buffering the voice paging for a certain time. After the device responds and becomes active, a notification message for receiving voice call is transmitted to the terminal device, thereby enabling 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 that receives voice paging for CSFB from the MSC of the WCDMA network or packet paging from the EPC network;
A paging transmitter for transmitting the voice paging or packet paging to the terminal device;
If the voice paging is repeatedly received from the MSC while the packet paging or voice paging is transmitted to the terminal device through the paging transmitter, and the packet paging is transmitted to the terminal device, the voice paging is performed for a predetermined time. A control unit which buffers the data while providing the fact that the voice paging is received to the terminal device
Redundant paging processing device in the EPC network comprising a. The method of claim 1,
The control unit,
The apparatus for redundant paging in the EPC network, characterized in that to transmit a notification notifying the fact that the voice paging has been received after the terminal device becomes active through the packet paging. The method of claim 1,
The control unit,
When voice paging is received from the MSC before the packet paging is completed, the voice paging is buffered until the packet paging is completed, and after the packet paging is completed, a notification message indicating that the voice paging is received is received. Redundant paging processing device in the EPC network, characterized in that for transmitting. The method of claim 1,
The control unit,
When the packet paging is received, the duplicated paging processing apparatus in the EPC network, characterized in that for checking the state of the terminal device and transmitting the packet paging when the terminal device is in the idle state. Transmitting the packet paging to the terminal device when receiving the packet paging in the MME of the EPC network;
Buffering the voice paging for a predetermined time in the MME when voice paging is repeatedly received from the WCDMA network during the transmission of the packet paging;
Transmitting, by the MME, a notification message notifying the reception of the voice paging through the WCDMA network to the terminal device when the packet paging is completed;
Redundant paging processing method in an EPC network comprising a. The method of claim 5, wherein
Buffering the voice paging,
Receiving the voice paging according to reception of a voice call through a CSFB from a WCDMA network in the MME;
Checking at the MME whether the voice paging is duplicated during transmission of the packet paging;
Buffering the voice paging for a predetermined time in the MME when the voice paging is repeatedly received during the transmission of the packet paging.
Redundant paging processing method in an EPC network comprising a. The method of claim 5, wherein
The notification message,
And transmitting the paging after the terminal device becomes active through the packet paging. The method of claim 5, wherein
In the step of transmitting the packet paging,
The MME checks the state of the terminal device when the packet paging is received, and if the terminal device is in the idle state, the duplicate paging processing method in the EPC network, characterized in that for transmitting.

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