KR20160054321A - Method and apparatus for call processing in gateway - Google Patents

Abstract

The present invention relates to a method for call processing in a gateway and a device thereof capable of reducing signaling if a user terminal, which completed accessing to an LTE network, changes the active state and idle state frequently. The call processing device of the present invention communicates with the user terminal; produces and stores a bearer conversion request message when the state of ECM-connected changes to the state of ECM-idle and drives a first timer; drives a second timer when the state of ECM-idle changes to the state of ECM-connected; and transmits the stored bearer modification request message to the outside when the first timer or the second timer is terminated.

Description

TECHNICAL FIELD [0001] The present invention relates to a method and apparatus for processing a call to a gateway,

In particular, the present invention relates to a mobile communication field, and more particularly, to a mobile communication system in which when a terminal of a user who has connected to an LTE (Long Term Evolution) network frequently transitions between an active state and an idle state, To a call processing method and apparatus capable of reducing the number of calls.

Recently, due to the rapid development of communication, computer network and semiconductor technology, not only various services using wireless communication networks have been provided, but the demand of users has been increasing day by day, and the global wireless Internet service market has been exploding Trend. Accordingly, a service provided by a mobile communication system using a wireless communication network is being developed not only as a voice service, but also as a multimedia communication service for transmitting various data. Recently, with the increase of smart phones and the demand for data traffic, mobile operators are investing equipment and technology considering the system part and the influence to accommodate the increased data traffic in various ways.

Long Term Evolution (LTE) is a network for realizing requirements of high data rate, low-latency, and packet optimized radio access for an access network , And is designed to accommodate high-speed rich media while ensuring backward compatibility with existing 3GPP / non-3GPP access networks. LTE is an All-IP-based network that excludes existing circuit-switched based communications and enhances quality of service (OoS) management functions to provide real-time services (eg, voice communications, video communications) Thereby improving the efficiency of network resources by providing differentiated QoS for real-time services (e.g., web browsing, Store and Forward data transmission). We also extended the bandwidth for wireless communications by introducing smart antenna technology (MIMO: multiple input multiple output).

In the Evolved Packet Core (EPC) network, which is an LTE core network, the eNodeB, the MME, the MME, the Serving Gateway, and the S-GW < GW (Packet Data Network-Gateway) to perform call processing for voice and data processing. In the EPC network, a control message such as call setup and release is recognized as an IP packet and transmitted to the P-GW or received from the P-GW and transmitted to the user equipment (UE).

If the bearer is set to use the radio resource in the LTE system (active state) and the radio resource used for the bearer setup for a certain period of time is not used, the radio resource used for the bearer setup is released for efficient use of the radio resource (Inactive state). After releasing the radio resource used for bearer setup, if there is a reception signal for a user terminal using the corresponding bearer, the S-GW informs the MME through a Downlink Data Notification message. At this time, the MME can notify the user terminal of the reception signal through the paging procedure. The user terminal transmits a Service Request message to the MME in response to the Downlink Data Notification message and requests the MME to reconnect the radio resource used for the bearer setup. When a reconnection of a radio resource is requested, a Modify Bearer Request message is generated, and a Modify Bearer Request message is high enough to occupy most of the EPC signaling. In particular, even if a smartphone, which is one of the user terminals, does not execute an application at the request of a user, the user terminal frequently transitions between the active state and the inactive state by an application operating in the background. There is a problem that a Modify Bearer Request message is generated as many times as the number of transitions of the user terminal, and a load is generated in the EPC equipment and the EPC network.

Korean Patent Laid-Open Publication No. 10-2013-0004375 (published on March 1, 2013)

The present invention relates to a call processing method capable of reducing signaling when a terminal of a user who has completed connection to an LTE (Long Term Evolution) network frequently transitions between an active state and an inactive state, And an apparatus.

A method of processing a call in a gateway of the present invention includes the steps of: a) communicating with a user terminal; b) generating and storing a bearer change request message when a state transition occurs from an ECM-Connected state to an ECM-Idle state in the user terminal, and driving a first timer; c) driving a second timer when a state transition occurs from the inactive state to the active state; and d) if the first timer or the second timer is terminated, controlling to transmit the stored bearer change request message to the outside.

Also, a method of processing a call in a gateway of the present invention includes the steps of: a) communicating with a user terminal; b) generating and storing a bearer change request message for requesting to stop packet monitoring for billing when a state transition from an active (ECM-Connected) state to an inactive (ECM-Idle) state occurs in the user terminal, ; c) calculating a state transition from the inactive state to the active state or the number of state transitions from the active state to the inactive state within the set time of the timer; d) if the number of times of occurrence of the state transition is greater than a preset threshold value, transmitting the stored bearer change request message to the outside before the end of the set time of the timer; and if the number of occurrence of the state transition is less than or equal to a preset threshold, And controlling the stored bearer change request message to be transmitted to the outside after the set time has elapsed.

Further, the gateway processing apparatus of a gateway of the present invention performs communication with a user terminal, and when a state transition from an active (ECM-Connected) state to an inactive (ECM-Idle) state occurs in the user terminal, Generates a change request message, drives a first timer, drives a second timer when a transition occurs from the inactive state to the active state, and when the first timer or the second timer ends, A control unit for controlling the transmission of the message to the outside; And a storage unit for storing the generated bearer change request message.

The call processing device of the gateway of the present invention is a device that communicates with a user terminal and transmits a packet for billing when the state transition from the activated (ECM-Connected) state to the inactive (ECM-Idle) Generates and stores a bearer change request message for requesting to stop the monitoring, drives a timer, calculates a state transition from the inactive state to the active state, or the number of state transitions from the active state to the inactive state And transmitting the bearer change request message to the outside before the end of the set time of the timer if the number of times of the occurrence of the state transition is greater than a preset threshold value and if the number of occurrences of the state transition is less than or equal to a predetermined threshold, And transmits the stored bearer change request message A control unit for controlling transmission to outside; And a storage unit for storing the generated bearer change request message and the threshold value.

According to the present invention, it is possible to reduce the number of occurrences of a bearer change request (MBR: Modify Bearer Request) message generated every time an ECM (EPS Connected Management) state transition of a user terminal occurs to reduce a system load in an EPC (Evolved Packet Core) .

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a diagram showing a configuration of a mobile communication network according to an embodiment of the present invention; Fig.
BACKGROUND OF THE INVENTION 1. Field of the Invention [0001]
3 is a diagram illustrating a call processing procedure for packet and voice service support in an EPC network according to an embodiment of the present invention.
4 is a diagram illustrating an example of a wireless section deactivation procedure according to an embodiment of the present invention.
FIG. 5 is a diagram illustrating an example of a radio section activation procedure according to an embodiment of the present invention. FIG.
6 is an exemplary view showing a configuration of a call processing apparatus according to an embodiment of the present invention;
FIG. 7 is a flowchart illustrating a procedure of a call processing method according to an embodiment of the present invention; FIG.
8 is a flowchart illustrating a procedure of a call processing method according to another embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the following description, well-known functions or constructions will not be described in detail if they obscure the subject matter of the present invention.

In one embodiment, the mobile communication network includes a wireless network such as a Global System for Mobile communication (GSM), a 2G wireless communication network such as CDMA, an LTE network, a wireless Internet such as WiFi, a Wireless Broadband Internet (WiBro), and a World Interoperability for Microwave Access (For example, 3G mobile communication network such as WCDMA or CDMA2000, High Speed Downlink Packet Access (HSDPA) or 3.5G mobile communication network such as High Speed Uplink Packet Access (HSUPA), or the like) A 4G mobile communication network currently in service, and any other mobile communication network including a macro base station (macro eNodeB), a micro base station (Pico eNodeB, Home eNodeB), and a user terminal (UE: User Equipment) However, the present invention is not limited thereto. Hereinafter, an E-UTRAN (Evolved Universal Terrestrial Radio Access Network) as a radio access network of LTE will be mainly described.

As shown in FIG. 1, the mobile communication network may include one or more network cells, and may include a Heterogeneous Network (HET) environment in which different kinds of network cells may be mixed in a mobile communication network. The mobile communication network includes miniature base stations (Pico eNodeB, Home-eNodeB, relay, etc.) 11 to 15, 21 to 23, and 23, which manage small-sized network cells (e.g., 'small cells' such as picocells, femtocells, (Macro eNodeBs) 10, 20 and 30 for managing a wide range of cells (for example, 'macro cells' (MSS) 60, an S-GW (Serving Gateway) 80, a P-GW (Packet Data Network) gateway 90 and an HSS (Home Subscriber Server) (100). Each component shown in Fig. 1 is illustrative, and the components of the mobile communication network in which the present invention can be implemented are not limited to those shown in the drawings.

For example, the macro base stations 10, 20 and 30 can be used in an LTE network, a WiFi network, a WiBro network, a WiMax network, a WCDMA network, a CDMA network, a UMTS network, But is not limited to, the characteristics of the macro cell base station that manages the base station.

The micro base stations 11 to 15 and 21 to 23 and 31 to 33 can be used in an LTE network, a WiFi network, a WiBro network, a WiMax network, a WCDMA network, a CDMA network, a UMTS network, but is not limited to, the features of a pico base station, an indoor base station or a femto base station, or a relay that manages a cell having a radius of about m to several tens of meters.

The micro base stations 11 to 15, 21 to 23 and 31 to 33 and the macro base stations 10, 20 and 30 can independently have connectivity with the core network.

The user terminal 40 may be a mobile Internet network such as a GSM network, a 2G wireless communication network such as a CDMA network, a wireless Internet network such as an LTE network and a WiFi network, a WiBro network, and a WiMax network, But are not limited to, the characteristics of the terminal.

The management server (O & M server) 70, which is a network management apparatus of the micro-base station, is responsible for configuration information and management of the micro base stations 11 to 15, 21 to 23 and 31 to 33 and the macro base stations 10, 20 and 30 . The management server 70 can perform all the functions of the SON server 50, the MME 60, and the HSS 100. [ SON server 50 may include any server that performs macro / micro base station installation and optimization and functions to provide basic parameters or data necessary for each base station. The MME 60 may include any entity used to manage the mobility of the user terminal 40 and the like. In addition, the MME 60 performs a function of a base station controller (BSC) and performs resource allocation, call control, handover control, voice and packet processing, and the like on the base stations (pico eNodeB, home eNodeB, macro eNodeB, Control and so on. The HSS 100 is a kind of database for service / authentication of the subscriber.

In one embodiment, one management server 70 can perform all the functions of the SON server 50, the MME 60, and the HSS 100, and the SON server 50, the MME 60, The base station 100 may manage one or more macro base stations 10, 20 and 30 and one or more micro base stations 11 to 15, 21 to 23 and 31 to 33.

Although it is assumed that a macro cell, a pico cell, and a femtocell are mixed in the mobile communication network, the network cell may be composed of a macro cell, a pico cell, and a macro cell.

When the mobile communication network is assumed to be an LTE network, the LTE network is interworked with an inter-RAT network (WiFi network, WiBro network, WiMax network, WCDMA network, CDMA network, UMTS network, GSM network, etc.). (LTE network, WiFi network, WiMax network, WCDMA network, CDMA network, UMTS network, GSM network, etc.) when one of the inter-RAT networks (e.g., WiBro network) is the mobile communication network. (WiFi network, WiMax network, WCDMA network, CDMA network, UMTS network, GSM network, etc.) are shown apart from one another in the drawing, it is assumed that it is overlaid.

If the micro base stations 11 to 15, 21 to 23 and 31 to 33 and / or the macro base stations 10, 20 and 30 are collectively referred to as a 'base station device', the LTE base station device (eNB in FIG. The Evolved UMTS Terrestrial Radio Access Network (E-UTRAN) 25 is a flat structure based on IP and processes data traffic between the user terminal 40 and the core network. The signal control between them is performed by the MME 60. The MME 60 takes charge of signal control between the eNB 25-n and the S-GW 80 and determines where to route the incoming data from the user terminal 40. [ The S-GW 80 performs an anchor function between the eNBs 25-n and a user terminal between the 3GPP network and the E-UTRAN and accesses the IP network through the P-GW 90. [ The MME 60 / S-GW 80 as a core network equipment manages a plurality of eNBs 25-n, and each eNB 25-n is composed of a plurality of cells. (S1-MME and S1-U in FIG. 2) are used between the eNB 25-n and the MME 60 / S-GW 80, An X2 interface (not shown) is used for over and SON functions.

The setup of the network interface is performed by setting the S1 interface connecting with the MME 60 at the center of the system and the X2 interface which is a network line for direct communication with the eNBs 25-n of other cells existing on the present system. The S1 interface exchanges operation and management (OAM) information to support the movement of the user terminal 40 by exchanging signals with the MME 60. [ Also, the X2 interface exchanges signals for fast handover, load indicator information, and information for self-optimization among the eNBs 25-n.

2 is a diagram illustrating an exemplary configuration of an EPC network according to an embodiment of the present invention.

The E-UTRAN 25 is an LTE radio access network composed of eNBs 25-1, ..., 25-n, ..., and is based on IP and is connected between the UE 40 and a wireless communication core network And transmits data and control information. In addition, when a terminal using the LTE system moves to an existing 2G / 3G mobile communication network using a voice service, a paging request for a circuit switch (Fallback) to receive voice service, an SMS message to the UE 40 ) And a direct connection to a target cell capable of a CS service.

2, "LTE-Uu" represents an air interface between the E-UTRAN 25 and the UE 40, "S1- MME" represents an interface between the E-UTRAN 25 and the MME 60, "S1-U" represents the interface between the E-UTRAN 25 and the S-GW 80, "S11" represents the interface between the MME 60 and the S-GW 80, "S5 / Indicates an interface between the S-GW 80 and the P-GW 90, and "SGi" may indicate an interface between the P-GW 90 and the IP network. And "S6a" may represent the interface between the MME 60 and the HSS 100.

The UE 40 and the eNBs 25-1 to 25-n of the E-UTRAN 25 communicate via the RRC (Radio Resource Control) protocol and the eNB 25- A broadcasting message to a cell area to be controlled by the RRC message is defined as an RRC message. The RRC message may include control messages from the Non-Access Stratum (NAS) protocol, which control messages are transparently transferred to the UE 40 or the core network without being read in the E-UTRAN 25 .

The eNB 25-n is an end point for the radio signal of the E-UTRAN 25 and the control signal is interlocked with the MME 60 via the S1-MME interface and the data traffic is transmitted to the S- (80). The S-GW 80 performs a buffering function for the anchor and downlink traffic for mobility in the E-UTRAN 25. [ The P-GW 90 is an external IP network connection point, and performs IP allocation and billing for a mobile subscriber and traffic control functions for user data.

The IP network provides an IMS (IP Multimedia Subsystem) service for the UE 40 in the EPC network, and includes Policy & Charging Rule Function (PCRF), IMS nodes (for example, Proxy Call Session Control Function (P-CSCF) (Interrogating Call Session Control Function (CSCF), Serving Call Session Control Function (S-CSCF), Application Function (AF)), and the like.

UE 40 sends and receives a call control message for multimedia services using IMS nodes and the Gm interface through an EPC bearer (provided by E-UTRAN / S-GW / P-GW).

The E-UTRAN 25 provides a radio communication function to the UE 40 and performs a function of managing radio resources for the radio communication function.

The MME 60 may receive authentication information for authenticating the UE 40 from the HSS 100 and perform authentication of the UE 40. [ The MME 60 also manages the mobility of the UE 40 and the eNB 25-n at a higher level in the eNB 25-n, and performs call control such as setting up / releasing an EPS (Evolved Packet System) session and bearer Function can be performed. The mobility and session control with the UE 40 is handled by the NAS protocol at the NAS (Non-Access Start) layer located in the control plane of the UE 40 and the MME 60, And the MME 60 communicate with each other through the NAS message. NAS function is divided into EMM (EPS Mobolity Management) and ESM (EPS Session Management) functions. In addition, the MME 60 can be directly connected to the IP network through the S-GW 80 and the P-GW 90. The call processing control signal of the eNB 25-n is transmitted to the S-GW 80 via the MME 60 and is transmitted to the P-GW 90 in response to the call processing control signal, Lt; / RTI &gt; The EMM is a sublayer located in the NAS layer, and the EMM procedure is performed, so that the UE 40 has seven EMM states and the MME 60 has four EMM states. In order for the UE 40 and the MME 60 to send and receive NAS messages, a signaling connection must be created between the UE 40 and the MME 60 to allow the transmission of the NAS message. This is called an EPS Connection Management connection do. The ECM connection is a logical connection and consists essentially of an RRC connection established between the UE 40 and the eNB 25-n and an S1 signaling connection established between the eNB 25-n and the MME 60. That is, the ECM connection is turned on / off means that the RRC connection and the S1 signaling connection are both turned on / off. When an ECM connection is established, an RRC connection is seen from the UE 40, and an S1 signaling connection is established from the MME 60. [ The ECM connection has ECM-Connected and ECM-Idle states depending on whether the NAS signaling connection, ECM connection, or not. According to the EMM procedure, the ECM-Connected state and the ECM-Idle state are frequently moved. This change process is referred to as a state transition.

The S-GW 80 acts as a gateway between the 3GPP network and the E-UTRAN 25 and provides handover between the eNBs 25n and the mobility of the UE 40 between the 3GPP network and the 3GPP network (inter-3GPP) A mobility anchor function can be performed. The S-GW 80 can transmit to the P-GW 90 a job necessary for call processing according to the control signal of the eNB 25-n.

The P-GW 90 may allocate an IP address to the UE 40 and apply different QoS policies to the UE 40. [ In addition, the P-GW 90 acts as a gateway to a PDN (Packet Data Network), allowing the UE 40 to access a data network such as the Internet or the Internet to receive services.

Although the S-GW 80 and the P-GW 90 are illustrated as being separated and communicating at the S5 / S8 interface as an embodiment, the S-GW 80 and the P- single gateway).

The HSS 100 may manage authentication information for authenticating the UE 40, location information of the UE 40, and the profile of the UE 40. [ The profile of the UE 40 may include QoS rating information (e.g., priority, maximum available bandwidth, etc.) for each service item to which each UE 40 subscribes. In one embodiment, the authentication information for authenticating the UE 40 and the profile of the UE 40 may be transferred from the HSS 100 to the MME 60 when the UE 40 connects to the network.

The PCRF (not shown) manages policies and rules for charging and allows the P-GW 90 and the S-GW 80 to provide appropriate QoS for the UE 40 and use Allows you to perform the billing function for the bearer.

The IMS node (not shown) is made up of nodes such as P-CSCF, I-CSCF, S-CSCF, and AF in detail and the UE 40 provides multimedia services such as VoIP give.

3 is a diagram illustrating call processing procedures for packet and voice service support in an EPC network according to an embodiment of the present invention.

3, when the UE 40 requests call processing to the MME 60 via the eNB 25-n of the E-UTRAN 25, the MME 60 transmits a request to the UE 40 The subscriber information is received from the HSS 100. GW 80 or P-GW 90, and transmits the bearer for packet transmission to the UE 40. The bearer for the transmission of the packet is called the S-GW 80 and the P-GW 90, respectively.

Specifically, in order to receive the packet service and the voice service, the UE 40 first transmits a call processing request message to the radio section (S310). The eNB 25-n of the E-UTRAN 25 forwards the call processing request message received from the UE 40 to the MME 60 at step S320, and the MME 60 transmits the received call processing request The HSS 100 requests the HSS 100 to prepare for the call setup with the UE 40 and receives the information for the call setup preparation from the HSS 100 in step S330. The MME 60 selects one of the plurality of S-GWs 80 / P-GWs 90 using the information received from the HSS 100 and requests a bearer setup. When the bearer setup is completed (S340), a packet service and a voice service for the UE 40 are possible. At this time, upon completion of the bearer setup with the S-GW 80 / P-GW 90, the MME 60 transmits a completion message (attach complete) for the attach request of the UE 40 to the user It can be informed that the resource allocation for the network has been approved and assigned in the network. In addition, the MME 60 may transmit location information of the UE 40 to the HSS 100 and perform location registration of the UE 40 (S350).

4 is a view illustrating an example of a wireless section deactivation procedure according to an embodiment of the present invention.

As shown in FIG. 4, the eNB 25 - n and the eNB 25 - n S - GW 80 - 80 in the network connection of the specific user terminal 40 - May become a connection state for providing a service (S401). If the service is not used for a certain period of time after the connection of the radio resources, the user terminal 40 can transmit a radio resource release request message to the MME 60 in order to use the radio resource efficiently (S402) 25-n) and the S-GW 80 (S403). The S-GW 80 can transmit a Modify Bearer Request message to the P-GW 90 to notify that the connection between the eNB 25-n and the S-GW 80 is disconnected, (S404). &Lt; / RTI > In addition, the S-GW 80 may transmit a radio resource release complete message to the MME 60 to notify that the radio resources of the eNB 25-n and the S-GW 80 have been released (S405) The MME 60 may transmit a radio resource release complete message to the eNB 25-n (S406). The radio resource can be released and transition to the inactive state may be performed as described above (S407). The connection of the S1 section (user terminal 40 <-> eNB 25-n) may be canceled. The S1 connection release means releasing the S1 signaling connection and the RRC connection in the control plane for the user terminal 40 and releasing the downlink S1 bearer and the data radio bearer in the user plane .

5 is an exemplary diagram illustrating a radio section activation procedure according to an embodiment of the present invention.

As shown in FIG. 5, when data to be transmitted to the corresponding user terminal 40 occurs in the idle state in which the radio resource is released (S501) (in one embodiment, when receiving a kakao talk or sms message ), And a process of reconnecting the released radio resources by transition to the active state is required. That is, the user terminal 40 can transmit a radio resource connection request (Serivce Request) message to the MME 60 (S502), and transmits the released radio resource between the eNB 25-n and the S- (S503). The S-GW 80 may transmit a Modify Bearer Request message to the P-GW 90 to inform that the connection between the eNB 25-n and the S-GW 80 is reconnected, (S504). In addition, the S-GW 80 transmits a radio resource connection completion message to the MME 60 to notify that the radio resources of the eNB 25-n and the S-GW 80 are connected (S505) The MME 60 may transmit a radio resource release complete message to the eNB 25-n (S506). The radio resources of the eNB 25-n MME 60 and the eNB 25-n S- GW 80 may be connected to provide the service through the above procedure (S507 ).

6 is an exemplary view showing a configuration of a call processing apparatus according to an embodiment of the present invention.

6, the call processing apparatus 600 may include a storage unit 610, a control unit 620, and a transmission / reception unit 630. In one embodiment, the call processing apparatus 600 may be included in the S-GW 80 or may be provided separately from the S-GW 80. In addition, the storage unit 610, the control unit 620, and the transmission / reception unit 630 included in the call processing apparatus 600 may be interconnected via the system bus B.

The storage unit 610 may store a bearer change request message not transmitted to the P-GW 90 among the bearer change request (MBR) message formed by the controller 620. In addition, the storage unit 610 may store a threshold value for the number of state transitions between the deactivated state (ECM-Idle) and the activated state (ECM-Connected). In addition, in one embodiment, the storage unit 610 may include a read only memory (ROM), a random access memory (RAM), a Compact Disks (CD) ROM, a magnetic tape, a floppy disk, However, the present invention is not limited to the above configuration.

The control unit 620 performs an initial network access procedure for the user terminal 40 to receive a packet service and a voice service using the mobile communication network and changes the state from an ECM-Connected state to an ECM-Idle state (Monitoring stop) message for requesting to stop packet monitoring for a charge when a transition occurs, stores it in the storage unit 610, and drives a first timer to generate a bearer change request -600 sec.) Can be judged. If the state transition from the inactive state to the active state occurs in the state where the timer is operating, the control unit 620 drives the second timer to set a predetermined time (for example, 1-600 sec. ) And can control to transmit a bearer change request message (monitoring stop) stored in the storage unit 610 to the P-GW 90 when the first timer or the second timer ends . The first timer and the second timer may be set to have the same time, or may be set to have different times. In addition, the controller 620 calculates the number of state transitions from the inactive state to the active state or from the active state to the inactive state in the state where the timer is in operation, and when the state transition is greater than the predetermined threshold value, And to transmit the stored bearer change request message (monitoring stop) to the P-GW 90.

The transmitting and receiving unit 630 transmits and receives a control message for performing the initial network connection procedure to the MME 60 and the P-GW 90 for the user terminal 40 to receive the packet service and the voice service using the mobile communication network , And may transmit a bearer change request message to the P-GW 90 according to the control of the controller 620.

7 is a flowchart illustrating a procedure of a call processing method according to an embodiment of the present invention.

7, the call processing apparatus 600 communicates with the user terminal 40 using the mobile communication network, thereby performing the initial network connection procedure so that the user terminal 40 is provided with the packet service and the voice service (S701), a bearer change request (monitoring stop request) for requesting to stop packet monitoring for billing when a state transition occurs from an ECM-Connected state to an inactive (ECM-Idle) state at the user terminal 40 Message is generated and stored, and the first timer is driven to determine whether a predetermined time (for example, 1-600 sec.) Has elapsed (S702). Also, the call processing apparatus 600 determines whether a state transition has occurred from the inactive state to the active state in the state where the timer is operating (S703), and if the state transition occurs, the second timer (Step S704). If it is determined that the first timer or the second timer is terminated (S705), if the first timer or the second timer is terminated, the stored bearer change request message 90) (S706). The first timer or the second timer may be set to have the same time, or may be set to have another time.

8 is a flowchart illustrating a procedure of a call processing method according to another embodiment of the present invention.

8, the call processing apparatus 600 communicates with the user terminal 40 using the mobile communication network, thereby performing the initial network connection procedure so that the user terminal 50 is provided with the packet service and the voice service (S801), a bearer change request for requesting to stop packet monitoring for billing when a state transition occurs from the ECM-Connected state to the inactive (ECM-Idle) state at the user terminal 40 Message is generated and stored, and the timer is driven to determine whether a predetermined time (for example, 1-600 sec.) Has elapsed (S802). Further, the call processing apparatus 600 calculates the number of state transitions from the inactive state to the active state or from the active state to the inactive state in the state where the timer is operating (S803), and the calculated state transition occurrence count If the number of times of state transition is less than or equal to a preset threshold value, the P-GW 90 transmits a bearer change request message (monitoring stop) stored before the set time of the timer is exceeded (S804) GW 90 in step S805 after the set time of the timer has expired in step S805.

Although the method has been described through particular embodiments, the method may also be implemented as computer readable code on a computer readable recording medium. A computer-readable recording medium includes all kinds of recording apparatuses in which data that can be read by a computer system is stored. Examples of the computer-readable recording medium include a ROM, a RAM, a CD-ROM, a magnetic tape, a floppy disk, an optical data storage device, and the like, and may be implemented in the form of a carrier wave (for example, transmission via the Internet) . In addition, the computer-readable recording medium may be distributed over network-connected computer systems so that computer readable codes can be stored and executed in a distributed manner. In addition, functional programs, codes, and code segments for implementing the above embodiments can be easily deduced by programmers of the present invention.

Although the present invention has been described in connection with certain embodiments thereof, it should be understood that various changes and modifications may be made therein without departing from the spirit and scope of the invention as will be apparent to those skilled in the art to which the invention pertains. something to do. It is also contemplated that such variations and modifications are within the scope of the claims appended hereto.

11 ~ 15, 21 ~ 23, 31 ~ 33: micro base stations 10, 20, 30: macro base station
40: User terminal 50: SON server
60: MME 80: S-GW
90: P-GW 100: HSS
600: call processing device 610:
620: Control section 630: Transmitting /
B: System bus

Claims (6)

A call processing method in a gateway,
a) communicating with a user terminal;
b) generating and storing a bearer change request message when a state transition occurs from an ECM-Connected state to an ECM-Idle state in the user terminal, and driving a first timer;
c) driving a second timer when a state transition occurs from the inactive state to the active state;
d) if the first timer or the second timer is terminated, controlling to transmit the stored bearer change request message to the outside
Lt; / RTI &gt; The method according to claim 1,
Wherein the first timer and the second timer have the same time. The method according to claim 1,
Wherein the first timer and the second timer are in the range of 1 to 600 seconds. A call processing method in a gateway,
a) communicating with a user terminal;
b) generating and storing a bearer change request message for requesting to stop packet monitoring for billing when a state transition from an active (ECM-Connected) state to an inactive (ECM-Idle) state occurs in the user terminal, ;
c) calculating a state transition from the inactive state to the active state or the number of state transitions from the active state to the inactive state within the set time of the timer;
d) if the number of times of occurrence of the state transition is greater than a preset threshold value, transmitting the stored bearer change request message to the outside before the end of the set time of the timer; and if the number of occurrence of the state transition is less than or equal to a preset threshold, Controlling to transmit the stored bearer change request message to the outside after the set time period has elapsed
Lt; / RTI &gt; 5. The method according to any one of claims 1 to 4,
The bearer change request message includes:
And a bearer change request message for requesting to stop packet monitoring for billing for the mobile communication service. 5. The method according to any one of claims 1 to 4,
The gateway
And a Serving Gateway (S-GW) that performs a mobility anchor function for providing mobility of the user terminal.

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