KR20140046235A - Apparatus and method for controlling loads - Google Patents

Abstract

In downlink data load control for reducing VoLTE incoming time in a call processing device of a mobile communication network, execution delay time of a downlink data notification procedure for notifying reception of packet data according to a data type of downlink packet data received from a communication network. By differently setting and applying differently to suit the characteristics of each data type, it is possible to reduce the incoming delay of the VoLTE call and to reduce the signal processing load.

Description

Load control device and method {APPARATUS AND METHOD FOR CONTROLLING LOADS}

The present invention relates to voice over LTE (VoLTE) call processing, and in particular, downlink packet data received from a communication network in downlink data load control for shortening a VoLTE incoming time in a call processing apparatus of a mobile communication network. By setting the D-Value of the downlink data notification (DDN) procedure that notifies the reception of packet data according to the data type of data), it is set differently to suit the characteristics of each data type. The present invention relates to a load control device and a method for reducing incoming call delay of a VoLTE call and reducing signal processing load.

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. In this way, the service proposed to enable voice communication in EPC or LTE is called VoLTE (Voice over LTE) service.

The VoLTE voice and video service is a multimedia service that uses a packet bearer on an Evolved Universal Terrestrial Radio Access Network (E-UTRAN) in an LTE / EPC network, and a mobile terminal accesses an LTE / EPC network attaches and updates the subscriber location and status information through the subscriber information authentication step, receives a session setup and a bearer allocation for the multimedia service, and receives a QoS (Quality of Service) level acceptable to the subscriber A multimedia service is provided according to the service.

In this case, when the subscriber station performs a UE triggered service request to receive packet data service such as VoLTE voice / video service, a bearer for uplink is configured first, and a downlink packet is configured in the network. This comes down.

Then, in the S-GW (serving-gateway) receiving the downlink packet as described above, DDN is generated to the MME unnecessarily by performing the DDN procedure for notifying the reception of packet data whenever the downlink packet is introduced. The information on the execution delay time (D-Value) to delay the transmission of a predetermined time is transmitted from the MME to the S-GW so that the S-GW does not duplicate the DDN.

1 illustrates a DDN procedure performed in an EPC network. Hereinafter, a conventional DDN procedure will be described in detail with reference to FIG. 1.

First, when the mobile terminal requests a service in order to receive a packet data service such as a VoLTE voice / video service, a Radio Access Bearer (RAB) Establishment Procedure (S10) is established between the eNodeB 210 and the MME 220. When the RAB configuration procedure S10 is completed, the eNodeB 210 transmits an uplink user packet to the S-GW 230 (S12).

Then, the S-GW 230 transmits the uplink user packet to the packet data network such as the IMS 300 (S14). As described above, after the uplink user packet is transmitted to a network such as the IMS 300, a downlink user packet for the uplink user packet is received from the packet data network such as the IMS 300 to the S-GW 230. (S16).

In this case, since the S-GW 230 cannot know the tunnel endpoint identifier (TEID) of the eNodeB 210, the S-GW 230 delays the DME for a D-Value time until the MME 220 and the Modify Bearer procedure (S18) are completed. By performing the DDN / DDN ack procedure (S22) with the 220 to prevent the occurrence of load due to unnecessary DDN transmission.

However, as described above, when the D-DN transmitting the packet data from the S-GW to the MME is delayed by a predetermined D-Value time regardless of the type of the packet data, it attempts to receive VoLTE voice / video. In the case of packet data according to the call, DDN transmission is delayed during the above D-Value time, which causes a problem of delayed reception of VoLTE call.

Korean Patent Laid-Open No. 10-2009-0118871 Published Nov. 18, 2009 discloses a method and apparatus for providing a voice call service in a mobile communication system and a technology related to the system.

Therefore, in the downlink data load control for shortening the VoLTE incoming time in the call processing apparatus of the mobile communication network, the present invention provides downlink data notification informing the reception of packet data according to the data type of the downlink packet data received from the communication network. By setting and applying the execution delay time (D-Value) of the procedure differently to suit the characteristics of each data type, it is intended to provide a load control apparatus and method to reduce the incoming delay of the VoLTE call and to reduce the signal processing load. .

The present invention described above is a load control device, comprising: a data type determination unit for checking a data type of a received packet data when receiving packet data from a communication network, and downlink data for notifying reception of the packet data according to the data type; The downlink data notification procedure is applied by applying a D-Value setting unit that sets the execution delay time of the notification (DDN) procedure differently to suit the characteristics of each data type, and an execution delay time set according to the characteristics of the data type. It includes a load control unit for executing.

The D-Value setting unit may be configured to set the execution delay time differently when the APN of the received packet data is a predetermined APN or when a predetermined value is included in the DDN message of the received packet data. It features.

In addition, the present invention is a load control method, the step of checking the data type of the received packet data when receiving the packet data from the communication network, and downlink data notification for notifying the reception of the packet data according to the data type (DDN) Setting the execution delay time (D-Value) of the procedure differently to suit the characteristics of each data type, and executing the downlink data notification procedure by applying the execution delay time set according to the characteristics of the data type. It includes a step.

The setting of the execution delay time may include checking whether an APN of the packet data is a predetermined APN or whether a predetermined value is included in a DDN message of the packet data, and performing the execution according to the inspection result. And differently setting the delay time.

In the downlink data load control for shortening the VoLTE incoming time in the call processing apparatus of the mobile communication network, the present invention provides a downlink data notification procedure for notifying the reception of packet data according to the data type of the downlink packet data received from the communication network. By setting the execution delay time differently to suit the characteristics of each data type, there is an advantage that the incoming delay of the VoLTE call can be reduced and the signal processing load can be reduced.

1 is a signal processing flowchart including a DDN procedure performed in a conventional EPC network.
2 is a configuration diagram of a heterogeneous mobile communication mixed service system including a heterogeneous mobile communication mixed call processing apparatus to which an embodiment of the present invention is applied;
3 is a detailed block diagram of a load control device according to an embodiment of the present invention;
4 is a flowchart of load control of downlink data to prevent VoLTE incoming delays in accordance with an embodiment of the present invention.

Hereinafter, the operation principle of the present invention will be described in detail with reference to the accompanying drawings. In the following description of the present invention, 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 of the present invention, and may be changed according to the intentions or customs of the user, the operator, and the like. Therefore, the definition should be based on the contents throughout this specification.

2 is a block diagram of a heterogeneous mobile communication mixed service system including a heterogeneous mobile communication mixed call processing apparatus to which an embodiment of the present invention can be applied. 2 illustrates a case in which a wideband code division multiple access (WCDMA) mobile communication system 100 is operated as a legacy network. The legacy network is a long term evolution (LTE) mobile communication system 200. Although the environment is mixed together, the legacy network is not limited thereto. For example, other asynchronous mobile communication systems such as GSM (Global System for Mobile) or other synchronous mobile communication systems such as CDMA2000 and the like may be used together with the LTE mobile communication system 200, An example will be described.

The WCDMA mobile communication system 100 includes a Node B 110, an RNC 120, a Mobile Switching Center / Visitor Location Register (MSC / VLR) 130, a CGS 140, (Serving General Packet Radio Service Support Node) 150 and a Gateway General Packet Radio Service Support Node (GGSN) 160.

The Node B 110 and the RNC 120 correspond to a radio access network area and the MSC / VLR 130 and the CGS 140 correspond to a circuit exchange core network. The SGSN 150 and the GGSN 160 exchange packets. Corresponds to the core network.

The NodeB 110 is composed of a plurality of cells, and a plurality of terminal devices can be connected to the cells. The NodeB 110, which is an aggregate of these cells, secures the frequency used for connection with the terminal devices and ensures a stable connection with the terminal devices.

The RNC 120 controls a plurality of NodeBs 110, allocates communication resources to each of the NodeBs 110, and handles functions such as handover.

The MSC / VLR 130 stores visitor location information, receives subscriber profile information, authentication and location related data from the HLR 410, and performs switching control for voice communication.

The CGS 140 serves as a gateway for connecting the WCDMA mobile communication system 100 to the general communication network, and enables communication with other communication systems connected to the general communication network. For example, the CGS 140 serves as a gateway between the circuit network 420 and the MSC / VLR 130 and is connected to the LTE mobile communication system 200 through the IMS 300 connected to the circuit network 420, Thereby enabling circuit communication between the systems 100. This CGS 140 may also be referred to as a GMSC (Gateway MSC) or a gateway exchange.

The SGSN 150 and the GGSN 160 belonging to the packet-switched core network area are connected to an IP network 430 such as the Internet, that is, a packet data network (PDN), to receive a packet- IP-based protocol interworking for matching with

For this, the SGSN 150 is connected to the RNCs 120 to manage the mobility of the mobile communication terminal and the packet session management. The GGSN 150 sets a PDP context with the GGSN 160, And performs the function of transmitting the data unit. Also, the SGSN 160 can perform IP routing and can perform an interaction such as location registration of the mobile communication terminal.

The GGSN 160 directly connects to the IP network 430 and acts as a gateway for connecting the IP network 430 and the packet switched (PS) domain of the WCDMA mobile communication system 100. The SGSN 150, And maintains routing information with the external network, and performs tunneling and IP routing functions.

The LTE mobile communication system 200 includes an eNodeB 210, an MME 220, a serving-gateway 230, a PDN GW 240, and a policy & charging rule function (PCRF) 250. .

The eNodeB 210 is a device that supports next generation technologies and services such as LTE, and functions as radio frequency (RF) transmission of transmission signals, measurement of signal strength and quality of transmission and reception, baseband signal processing, and channel card resource management . The eNodeB 210 ensures a stable connection with a plurality of terminal devices.

The MME 220 manages mobility of a terminal device, and is responsible for session management, idle subscriber management, paging, and subscriber authentication functions. That is, the MME 220 performs control such as processing a control signal when there is a binding request from the terminal device or another network node, for example, from the PDN GW 240 or the S-GW 230, And receives the subscriber profile information, authentication and location-related data from the HLR 410, and controls the setting of an EPS bearer or an IP tunnel, mobility management, and the like Function.

The S-GW 230 is a user plane node that performs session control for processing payload traffic according to a set session. The S-GW 230 interfaces with the eNodeB 210 through an S1-U interface, (Handover) in the communication system 200 and the 3GPP, establishes an ESP bearer (Evolved Packet System bearer) with the PDN GW 240, and delivers PDU (Packet Data Unit) using tunneling.

In addition, the S-GW 230 adjusts the execution delay time of the downlink data notification procedure according to the type of packet data for the downlink packet data received by the S-GW 230 according to an embodiment of the present invention. It may include a load control device.

The load control apparatus 500 may have a configuration as shown in FIG. 3, and execute execution time of a downlink data notification (DDN) procedure for notifying reception of packet data according to a data type of downlink packet data received from a communication network. By setting and applying (D-Value) differently to suit the characteristics of each data type, the load can be reduced by reducing unnecessary DDN generation between the S-GW 230 and the MME 220, and the incoming delay of the VoLTE call is also reduced. You can prevent it. More detailed operation of the load control device 500 will be described later in detail with reference to FIG. 3.

The PDN GW 240 is a user plane node that assigns an IP address of a terminal device and performs session control in cooperation with an external Internet network and a non-3GPP network. The PDN GW 240 is a user plane node that provides S- And has tunneling and IP routing functions. And delivers the PDU to the S-GW 230 and the external network.

The PCRF 250 provides dynamic QoS and billing rules according to the service data flow to perform communication policies and billing processing in the communication network.

The IP Multimedia Subsystem (IMS) 300 includes a Call Session Control Function (CSCF) 310, an Inter-working Media Gateway (IMG) 320, and a Home Location Register (HLR)

CSCF 310 is an infrastructure system that performs call processing and performs basic functions for multimedia session control based on SIP (Session Initiation Protocol). The CSCF 310 handles subscriber registration, authentication, billing, triggering and routing by service, inquiry of the location of the called party, compression and release of SIP messages, and can be divided into Proxy_CSCF, Interogating-CSCF and Serving-CSCF according to their roles.

The IMG 320 converts signaling and media for interworking with the LTE mobile communication system 200 connected to the CSCF 310 and the WCDMA mobile communication system 100 connected to the circuit network 420.

The HLR 330 is a network node including a data base including subscriber information for a wireless communication system for the WCDMA mobile communication system 100 and / or the LTE mobile communication system 200, Information, authentication, and location-related data.

In the embodiment of FIG. 2, the WCDMA mobile communication system 100 and the LTE mobile communication system 200 operate the HLR 410 in an integrated manner, and the IMS 300 exemplarily uses the HLR 330 in an independent manner. In addition, the WCDMA mobile communication system 100 or the LTE mobile communication system 200 may also independently operate the HLR. In addition, the WCDMA mobile communication system 100, the LTE mobile communication system 200, and the IMS 300 may operate one HLR in an integrated manner.

3 illustrates a detailed block configuration of the load control apparatus 500 according to an embodiment of the present invention. The load control apparatus 500 includes a data type determination unit 502, a D-value setting unit 504, and a load. Control unit 506 or the like.

Hereinafter, the operation of each component of the load control device 500 of the present invention will be described in detail with reference to FIG. 3.

The data type determination unit 502 checks the data type of the received packet data when the packet data is received from the communication network such as a packet data network to the S-GW 230 according to general data reception or VoLTE call reception. do. In this case, the data type of the packet data as described above may be divided into, for example, a VoLTE call and general data other than the VoLTE call. In this case, the data type determination unit 502 may determine whether the VoLTE call is performed by examining a specific APN (access point name) value set when the VoLTE call is received or a DDN extension value which is additional information for identifying the VoLTE call. .

The D-Value setting unit 504 mutually matches the D-Value, which is the execution delay time of the DDN procedure informing the reception of packet data according to the data type checked by the data type determination unit 502, to match the characteristics of each data type. Can be set differently.

That is, the D-Value setting unit 504 sets the D-Value to the first D-Value value when the packet data is data according to an incoming call other than a VoLTE call, and the D-Value setting data 504 when the packet data is data according to a VoLTE call incoming. -Value may be set to a second D-Value smaller than the first D-Value. As described above, the D-Value value set according to the data type in the D-Value setting unit 504 may be provided to the load control unit 506.

Then, the load controller 506 delays the D-Value by applying the D-Value set according to the characteristics of the data type, and then prevents unnecessary DDN from occurring by executing the DDN procedure with the MME 220.

In addition, the load controller 506 applies the D-Value of the DDN procedure as the second D-Value smaller than the first D-Value value for the data according to the VoLTE call reception at a faster time than the DDN procedure for the general data. By performing the DDN procedure for notifying the VoLTE call to the MME 220, the incoming delay for the VoLTE call is prevented from occurring.

4 illustrates a load control flow of downlink data capable of preventing VoLTE incoming delays according to an embodiment of the present invention. Hereinafter, embodiments of the present invention will be described in detail with reference to FIGS. 2 to 4.

First, when the mobile terminal 60 requests a service to receive a packet data service such as VoLTE voice / video service, a Radio Access Bearer (RAB) Establishment Procedure is established between the eNodeB 210 and the MME 220. When the RAB configuration procedure is completed, the eNodeB 210 transmits an uplink user packet to the S-GW 230.

Subsequently, after the uplink user packet is transmitted to the network such as the IMS 300 as described above, the downlink user packet for the uplink user packet is received from the packet data network such as the IMS 300 to the S-GW 230. Can be.

When packet data is received from the packet data network or the like to the S-GW 230 (S400), the load control apparatus 500 in the S-GW 230 checks the data type of the received packet data (S402). ). In this case, the data type of the packet data as described above may be divided into, for example, a VoLTE call and general data other than a VoLTE call. In the above case, the load control device 500 may determine whether or not the VoLTE call by examining a specific APN value set when the VoLTE call is received or a DDN extension value that is additional information for identifying the VoLTE call.

At this time, if the packet data is data according to the reception of general packet data other than the VoLTE call (S404), the load control device 500 sets the execution delay time D-Value to the first D-Value value (S406). After delaying the first D-Value by the value, the MME 220 performs a DDN procedure for notifying reception of packet data (S408).

On the contrary, if the packet data is data according to VoLTE call reception (S404), the load control apparatus 500 sets the D-Value to a second D-Value smaller than the first D-Value (S412). After delaying the second D-Value by a value, the MME 220 performs a DDN procedure for notifying reception of packet data (S414).

Accordingly, the load control device applies the execution delay time of the DDN procedure to the second D-Value value smaller than the first D-Value value for the data according to the VoLTE call reception, and the MME at a faster time than the DDN procedure for general data. By notifying the VoLTE call to be received, it is possible to prevent the incoming delay for the VoLTE call.

As described above, in downlink data load control for shortening the VoLTE incoming time in the call processing apparatus of the mobile communication network, downlink data notification informing the reception of the packet data according to the data type of the downlink packet data received from the communication network. By applying the execution delay time of the procedure differently to suit the characteristics of each data type, the incoming delay of the VoLTE call can be reduced and the signal processing load can be reduced.

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

In the present invention, in the downlink data load control for reducing the VoLTE incoming time in the call processing apparatus of the mobile communication network, the downlink data notification procedure for notifying the reception of packet data according to the data type of the downlink packet data received from the communication network is provided. By setting the execution delay time differently to suit the characteristics of each data type, it is possible to apply the EPC network to reduce the incoming delay of the VoLTE call and to reduce the signal processing load.

502: Data type determination unit 504: D-Value setting unit
506: load control unit

Claims (4)

A data type determination unit for checking a data type of the received packet data when receiving packet data from a communication network;
A D-value setting unit configured to differently set execution delay time (D-Value) of a downlink data notification (DDN) procedure for notifying reception of the packet data according to the data type to suit characteristics of each data type;
A load controller for executing the downlink data notification procedure by applying an execution delay time set according to the characteristic of the data type
Load control device comprising a.
The method according to claim 1,
The D-Value setting unit,
And if the APN of the received packet data is a predetermined APN or if a predetermined value is included in the DDN message of the received packet data, the execution delay time is set differently.
Upon receipt of packet data from a communication network, checking the data type against the received packet data,
Setting different execution delay times (D-values) of a downlink data notification (DDN) procedure for notifying reception of the packet data according to the data type to suit characteristics of each data type;
Executing the downlink data notification procedure by applying an execution delay time set according to the characteristics of the data type;
Load control method comprising a.
The method of claim 3, wherein
Setting the execution delay time,
Checking whether the APN of the packet data is a predetermined APN or a predetermined value is included in the DDN message of the packet data;
Setting the execution delay time differently according to the inspection result
Load control method comprising a.

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