KR20150134703A - Method and apparatus for call processing - Google Patents

Abstract

The present invention relates to a method and an apparatus for processing a call and, specifically, to a method for performing call processing by using periodic tracking area update procedures when reception data with respect to a user terminal having a released wireless section occurs, and an apparatus for the same. The apparatus for processing a call according to the present invention determines whether a mobility management entity (MME) receives a tracking area update (TAU) request message from the user terminal during the paging process between the MME and the user terminal, and performs reset of wireless resources for the released wireless section between the MME and the user terminal by using an initial setup request message, when the MME has received the TAU request message from the user terminal.

Description

≪ Desc / Clms Page number 1 > METHOD AND APPARATUS FOR CALL PROCESSING &

The present invention relates to a mobile communication system, and more particularly, to a method and apparatus for performing a call processing using a periodic location registration (Tracking Area Update) procedure when a received signal is generated for a user terminal whose radio section has been released.

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, eNodeB <-> MME (Mobility Management Entity), MME <-> S-GW (Serving Gateway), and S-GW < 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).

In the LTE system, if the bearer is set and the radio resource used for the bearer setup for a certain time is not used, the radio resource used for the bearer setup is released for efficient use of the radio resources. 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. However, if the user terminal can not receive the Downlink Data Notification message, there is a problem that the user terminal can not respond to the paging. If the MME does not receive a response to the paging, unnecessary call processing may occur because the paging is repeated a number of times. On the other hand, when the user terminal responds to the paging by the MME, the call processing for requesting the radio resource re-establishment proceeds. Also, even if the MME receives a response after several paging attempts, the S-GW must buffer the received signal until it receives a response to the paging. Therefore, if the amount of data of the network load and the received signal is large, there is a problem that the S-GW must discard the received signal waiting for a response to the paging of the user terminal without buffering any more.

Korean Patent Laid-Open No. 10-2011-0088673 (published on August 4, 2011)

The present invention provides a method and apparatus for performing call processing using a periodic location registration (Tracking Area Update) procedure when a received signal is generated for a user terminal whose radio section is released.

A method of processing a call according to the present invention comprises the steps of: a) determining whether a MME (Mobility Management Entity) has received a TAU (Tracking Area Update) request message from the user terminal during paging procedure between user terminals; b) When the MME receives the TAU request message from the user terminal, the MME performs an initial setup request message to reset the radio resources for the released radio section with the user terminals.

In addition, the call processing apparatus of the present invention includes a TAU determination unit for determining whether a TAU request message is received from the user terminal during a paging procedure between an MME (Mobility Management Entity) and a user terminal, And a radio section setting unit for performing radio resource reset for the released radio section with the user terminals using the initial setup request message when the TAU request message is received.

According to the present invention, a message load can be reduced by requesting radio resource allocation using a TAU (Tracking Area Update) procedure. In addition, the load on the MME, the base station apparatus (eNB) and the user terminal is reduced, so that the performance of the mobile communication system can be improved and the call processing time can be shortened.

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 data transfer procedure to a user terminal according to an embodiment of the present invention;
5 is an exemplary view showing a configuration of a call processing apparatus according to an embodiment of the present invention.
6 is a flowchart illustrating a procedure of a call processing method according to an 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.

1 is a diagram illustrating a configuration of a mobile communication network according to an embodiment 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 the like, 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 (e.g., 'macro cells'), a user equipment (UE) 40, A SON (Self Organizing / Optimizing Networks) server 50, an MME (Mobility Management Entity) 60, an S-GW (Serving Gateway) 80, a P-GW (Packet Data Network) And a Home Subscriber Server (HSS) 100. The number of each component shown in FIG. 1 is illustrative, and the number of each component of the mobile communication network in which the present invention can be implemented is not limited to the number 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 may 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, . 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 can 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.

When 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', LTE base station devices (eNB, The Evolved UMTS Terrestrial Radio Access Network (E-UTRAN) comprises an IP-based flat structure 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 base station device 25-n and the S-GW 80 and determines where to route the incoming data from the user terminal 40. [ The S-GW 80 functions as an anchor for the movement of the user terminal between the 3GPP network and the E-UTRAN between the base station device 25-n and the base station device 25-n, To the IP network. The MME 60 / S-GW 80 as a core network equipment manages a plurality of base station devices 25-n, and each base station device 25-n is composed of several cells. The S1 interface is used between the base station apparatus 25-n and the MME 60 / S-GW 80 and the X2 interface is used for the handover and SON functions between the base station apparatuses 25-n.

The setup of the network interface is accomplished by setting up 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 base station device 25-n of other cells present on the current 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. [ In addition, the X2 interface exchanges signals for fast handover, load indicator information, and information for self-optimization between the base station apparatuses 25-n.

Referring to FIG. 2, a configuration of an EPC (Evolved Packet Core) network to which the present invention can be applied will be described. A call processing process for supporting packet and voice services in an EPC network will be described with reference to FIG.

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 and "S5 / S8" represents the interface between the S-GW 80 and the P- have. And "SGi" may represent an interface between the P-GW 90 and the IP network.

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 are transparently transmitted to the UE 40 or the core network without being read in the E-UTRAN.

The eNB 25-n is an end point for the radio signal of the E-UTRAN and the control signal is interlocked with the MME 60 via the S1-MME interface and the data traffic is transmitted to the S-GW 80 via the S1- . The S-GW 80 performs a buffering function for anchor and downlink traffic for mobility in the E-UTRAN. 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. [ In addition, the MME 60 manages the mobility of the UE 40 and the base station apparatus 25-n at an upper level of the base station apparatus 25-n and can perform call control functions such as bearer setup / release. 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 base station apparatus 25-n is transmitted to the S-GW 80 via the MME 60 and is transmitted to the P-GW 90 ).

The S-GW 80 acts as a gateway between the 3GPP network and the E-UTRAN 25 and performs handover between the base station apparatus and the base station apparatus (inter-eNodeB) and between the 3GPP network and the 3GPP network (inter-3GPP) 40 to provide a mobility anchor function. The S-GW 80 can transmit to the P-GW 90 a job required for call processing according to the control signal of the base station device 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.

When the UE 40 requests the MME 60 to perform call processing through the E-UTRAN, the MME 60 receives the subscriber information for the UE 40 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 setup request message to the radio section (S301).

The eNB 25-n of the E-UTRAN 25 forwards the call processing request message received from the UE 40 to the MME 60 (S302), and the MME 60 transmits the received call processing request Requests information for preparation of call setup with the UE 40 to the HSS 100 in order to process the message and receives information for preparation of the call setup from the HSS 100 from the HSS 100 at step S303. 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 (S304), 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 And informs that the resource allocation for the network has been granted and assigned in the network.

4 is an exemplary diagram illustrating a data transfer procedure to a user terminal according to an embodiment of the present invention.

4, a bearer is generated between the MME 60 and the S-GW 80 / P-GW 90 (S401), and the radio resource used for the bearer setup for a predetermined time after completion of the call processing preparation If not used, the radio section between the user terminal 40 and the MME 60 may be released for efficient use of radio resources (S402). The MME 60 receives a Downlink Data Notification message from the S-GW 80 / P-GW 90 (S403), and transmits a Downlink Data Notification message to the MME 60 60 may notify the corresponding user terminal 40 of the reception signal through the paging procedure (S404). Thereafter, a series of procedures for establishing a radio resource between the user terminal 40 and the MME 60 with respect to the released radio section for processing the received signal can be performed (S405). (S405), establishes a channel through which the received signal can be transmitted, and transmits data included in the received signal from the S-GW 80 / P-GW 90 to the user terminal 40 (S406).

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

5, the call processing apparatus 500 may include a tracking area update (TAU) determination unit 510, a wireless section configuration unit 520, and a control unit 530. In one embodiment, the call processing apparatus 500 may be included in the MME 60 or may be provided separately from the MME 60.

The TAU determination unit 510 may determine whether a TAU request message has been received from the user terminal 40 during the paging procedure in progress between the MME 60 and the user terminal 40. [

When receiving the TAU request message from the user terminal 40, the wireless section setup unit 520 transmits an initial setup request message to the base station apparatus 25-n, The wireless section can be set. In one embodiment, the Initial setup request message includes an S-GW tunnel endpoint identifier (TEID), which forwards the message to the target S-GW 80 in the eNB 25-n entry, where the S- And may be a message containing information of the destination S-GW 80. The data included in the received signal can be transmitted from the S-GW 80 / P-GW 90 to the user terminal 40 by using the set radio section.

GW 80 / P-GW 80 so that data included in the received signal can be transmitted to the user terminal 40 using the radio section established between the MME 60 and the user terminal 40. [ 90). &Lt; / RTI &gt;

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

As shown in FIG. 6, the mobile communication system may include an MME 60 that manages the user terminal 40, the base station device 25-n, and the base station device 25-n. The MME 60 may also be directly connected to the IP network via the S-GW 80 and the P-GW 90. The call processing control signal of the base station apparatus 25-n is transmitted to the S-GW 80 through the MME 60 and can transmit a job required for call processing to the P-GW 90 according to the control signal. In the EPC network, the MME 60 can inform the user terminal 40 of the presence of a received signal from the S-GW 80.

The bearer setup is canceled and the radio resource is idle, the MME 60 notifies the S-GW 80 of a reception signal for the user terminal 40 through Downlink Data Notification (DDN) (S601), the MME 60 can inform the user terminal 40 of the presence of a received signal through paging (S602, S603). When the MME 60 receives a TAU request message from the base station apparatus 25-n during paging (S604), the MME 60 transmits an Initial context setup request message to the base station apparatus 25-n The user terminal 40 may connect the radio section (S605). The base station device 25-n can transmit a result indicating that the radio section is connected between the user terminal 40 and the base station device 25-n in response to the Initial context setup request message to the MME 60 as an Initial context setup response (S606). The MME 60 may inform the S-GW 80 of the connection of the radio link between the user terminal 40 and the base station apparatus 25-n using the Modify Bearer Request (MBR) message (S607) The GW 80 can transmit the received signal, which is being buffered, to the user terminal 40 using the connected radio section (S608). In one embodiment, the MBR message includes an eNB TEID, which forwards the message to the target eNB 25-n to be sent in the presence of the S-GW 80, where the eNB TEID is a message containing the information of the destination eNB have.

 Although the MME 60 receives a TAU request message during paging, the MME 60 waits until receiving a response from the user terminal 40 for paging without processing the TAU request message. However, according to the present embodiment, 60 can manage the response of the received signal more quickly and can reduce the load of the mobile communication system by processing the TAU procedure and the response procedure of the user terminal 40 for paging with only one TAU procedure.

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 over 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 to 15, 21 to 23, and 31 to 33: micro base stations 10, 20, and 30:
40: User terminal 50: SON server
60: MME 80: S-GW
90: P-GW 100: HSS
500: call processing apparatus 510: TAU judgment unit
520: radio section setting section 530:

Claims (10)

As a call processing method,
a) determining whether a MME (Mobility Management Entity) has received a TAU (Tracking Area Update) request message from the user terminal during a paging procedure between user terminals;
b) when the MME receives the TAU request message from the user terminal, performing an initial setup request message to perform a re-establishment of radio resources for the released radio section with the user terminals Processing method. The method according to claim 1,
c) controlling the S-GW (Serving Gateway) and the P-GW (PDN Gateway) to transmit the data included in the received signal to the user terminal using the re-established radio resource. 3. The method of claim 2,
The initial setup request message includes:
Wherein the base station device is a message containing information of a destination S-GW to which to forward the message. The method according to claim 2, wherein
The step c)
And controlling the S-GW and the P-GW using a Modify Bearer Request message. The method of claim 4, wherein
The Modify Bearer Request message includes:
Wherein the S-GW is a message containing information of a destination base station device to which a message is to be delivered. A call processing apparatus comprising:
A TAU determination unit for determining whether a TAU request message is received from the user terminal during a paging procedure in progress between an MME (Mobility Management Entity) and a user terminal;
And a radio section setting unit configured to set a released radio section between the MME and the user terminal using an initial setup request message when the TAU request message is received from the user terminal. The method according to claim 6,
The initial setup request message includes:
Wherein the base station device is a message containing information of a destination S-GW to which to forward a message. The method according to claim 6,
Further comprising a controller for controlling an S-GW (Serving Gateway) and a P-GW (PDN Gateway) to transmit data included in the received signal to the user terminal using the set radio interval. 9. The method of claim 8,
Wherein,
And controls the S-GW and the P-GW using a Modify Bearer Request message. The method of claim 9, wherein
The Modify Bearer Request message includes:
Wherein the S-GW is a message including information of a destination base station device to which a message is to be transmitted.

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