KR102098211B1 - Method and apparatus for updating data session - Google Patents

Abstract

A method for updating a data session is provided, receiving an Invite Message based on handover of a wireless terminal from a terminal switching device, and receiving an Invite Message based on the received Inbyte message to at least one node included in the IMS network. Retransmitting the byte message, receiving a response to the retransmitted byte message from any node included in the IMS network, and, when receiving the response, sending an update message to at least one node included in the IMS network Includes steps.

Description

Data session update method and device {METHOD AND APPARATUS FOR UPDATING DATA SESSION}

The present invention relates to a method and apparatus for updating a data session, and more particularly, to a method and apparatus for updating a data session so that a call does not end due to an SRVCC operation occurring at the time of update.

Recently, as the spread of wireless terminals (UEs) such as smart pads, tablet PCs, and smart phones increases, wireless terminals using LTE networks are increasing to provide better services than 3G.

At this time, a method of supporting call continuity in a wireless terminal is made by using an identifier. In this regard, in Korean Patent Publication No. 2012-0095897 (published on August 29, 2012), which is a prior art, there is a method of managing a video bearer and a voice bearer using an identifier during handover from a first communication network to a second communication network in a wireless terminal. Is disclosed.

However, when the wireless terminal becomes a handover (SRVCC) at the update time of the wireless terminal, the call of the wireless terminal may be terminated because the data session of the wireless terminal is not updated until the update time expires. .

In Korean Patent Publication No. 2012-0095897 (published on August 29, 2012), "Method and system for supporting single wireless video call continuity during handover" is disclosed.

One embodiment of the present invention can provide a data session update method and apparatus for immediately transmitting an update message to at least one node existing in an IMS network immediately after transmitting a data session and updating a remote leg in the SCC AS. . However, the technical problem to be achieved by the present embodiment is not limited to the technical problem as described above, and other technical problems may exist.

As a technical means for achieving the above technical problem, an embodiment of the present invention, receiving an Invite Message (Invite Message) based on the handover of the wireless terminal from the terminal switching device, based on the received byte message Retransmitting the in-byte message to at least one node included in the IMS network, receiving a response to the re-transmitted in-byte message from any node included in the IMS network, and when receiving a response, to the IMS network And sending an update message to the at least one node included.

According to any one of the above-described problem solving means of the present invention, it is possible to prevent the situation in which the call ends due to the SRVCC operation occurring at the time of update.

1 is a configuration diagram for describing a data network system according to an embodiment of the present invention.
FIG. 2 is a configuration diagram illustrating the data session updating apparatus shown in FIG. 1.
3 is a diagram illustrating a process in which data is transmitted and received between each of the components included in the data network system of FIG. 1 according to an embodiment of the present invention.
4 is an operation flowchart illustrating a data session update 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 so that those skilled in the art to which the present invention pertains can easily practice. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. In addition, in order to clearly describe the present invention in the drawings, parts irrelevant to the description are omitted, and like reference numerals are assigned to similar parts throughout the specification.

Throughout the specification, when a part is "connected" to another part, this includes not only "directly connected" but also "electrically connected" with another element in between. . Also, when a part is said to “include” a certain component, it means that the component may further include other components, not to exclude other components, unless otherwise stated. However, it should be understood that the existence or addition possibilities of numbers, steps, actions, components, parts or combinations thereof are not excluded in advance.

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

1 is a configuration diagram for describing a data network system according to an embodiment of the present invention. Referring to FIG. 1, a data network system may include a User Equipment (UE) 100, a first network network 300, a second network network 500, and an IMS network (IP Multimedia Subsystem, 700). At this time, the first network network 300 is Node B 310, RNC (Radio Network Control, 320), MSC (Mobile switching center, 330), GMSC (Gateway MSC, 340), PSTN (Public Switched Telephone Network, 350) ), SGSN (Serving GPRS Support Node, 360), GGSN (Gateway GPRS Support Node, 370), and PDN (Public Data Network, 380). The second network network 500 includes Evolved Node B (510), eNB (Serving Gateway, 520), MME (Mobility Management Entity, 530), PGW (PDN Gateway, 540), OCS (Online Charging System, 550) , OFCS (Offline Charging System, 560), SPR (Subscriber Profile Repository, 570), PCRF (Policy and Charging Rules Function, 580), PDN (Public Data Network, 590). The IMS network 700 includes a Call Session Control Function (CSCF) 710, a Telephony Application Server (TAS) 720, a Media Gateway Control Function (MGCF) 730, and a Single Radio Voice Call Continuity Application Server (SCC AS) 740, It may include MGW (Media Gate Way, 750), HLR (Home Location Register, 760), MRF (Multimedia Resource Function, 770). However, since the data network system of FIG. 1 is only an embodiment of the present invention, the present invention is not limitedly interpreted through FIG. 1.

Hereinafter, each component of the data network system of FIG. 1 will be described in detail.

UE 100 may be a user terminal. At this time, the UE 100 may be implemented as a terminal that can access a remote server or terminal. The UE 100 is, for example, a wireless communication device that is guaranteed for portability and mobility, and can be connected to the PDN 590 in all types, such as a smartphone, a smartpad, and a tablet PC. It may include a handheld-based wireless communication device.

The Node B 310 may serve as a base station that guarantees the mobility of the UE 100. At this time, the Node B 310 may secure a frequency used for connection with the UE 100 and perform a function of ensuring a stable connection with the UE 100.

The RNC 320 may manage radio resources, control a plurality of Node Bs 310, and perform management functions for interfaces between different network elements.

The MSC 330 may perform a central control function that processes incoming or outgoing signals and adjusts the first network network 300 to operate. In addition, the MSC 330 may control the radio link and the wired link, manage the location of the UE 100, and obtain location registration information of the UE 100 from the HLR 760. In this case, the HLR 760 may transmit various information such as the origination status, the reception status, and additional services of the UE 100 to the MSC 330 and data on the location of the UE 100.

The GMSC 340 may have an automatic tracking connection function to determine a mobile switching center (VMSC) and select and designate a call by referring to the location information of the UE 100 stored in the HLR 760.

The PSTN 350 may be a public switched telephone network. Here, a signal corresponding to a voice call (Circuit Service) may be transmitted through the path of the MSC 330-GMSC 340-PSTN 350.

The SGSN 360 may be a node responsible for data packet delivery within a service area. At this time, the SGSN 360 may have functions such as packet routing and transmission, mobility management, logical link management, authentication and charging, and the location register of the SGSN 360 is a GPRS user location registered in the SGSN 360 Information, user profiles, etc. can be stored.

The GGSN 370 may be a node responsible for a connection function between the backbone network and the external packet data network. The GGSN 370 converts the GPRS packet transmitted from the SGSN 360 into an appropriate packet data protocol format and transmits it, and converts the PDP address of the incoming packet data into the recipient's GSM address. In addition, the GGSN 370 may store the address and user profile of the SGSN 360 of the current user existing in the location register of the SGSN 360, and may perform a fee addition function.

The PDN 380 is a public data network, and may be, for example, the Internet or an IP network. Here, a signal corresponding to a data call (Packet Service) may be transmitted through the path of the SGSN 360-GGSN 370-PDN 380.

The eNB 510 may be an LTE base station, or a device that provides a wireless connection between the UE 100 and an LTE network. That is, the eNB 510 can connect between the SGW 520 and the UE 100 and manage handover of the UE 100. At this time, the eNB 510 and the UE 100 may be wirelessly connected.

The SGW 520 controls movement of the UE 100 between 3GPP / E-UTRAN and may perform anchoring during handover of the eNB 510 to the UE 100. For example, when the UE 100 is handed over from one eNB 510 to the other eNB 510, handover of the UE 100 may occur with the SGW 520 as an axis. Accordingly, the SGW 520 may operate as an anchor point in intra-LTE mobility.

The MME 530 may control signals between the eNB 510 and the SGW 520, determine routing, and authenticate the UE 100. At this time, the authentication protocol of the MME 530 may be EPS-AKA, and key information for authenticating the UE 100 may be stored in the HLR 760. Accordingly, the MME 530 may receive key information from the HLR 760 to perform authentication for the UE 100. Also, the MME 530 may manage the EPS bearer. At this time, the EPS bearer (Bearer) is, for example, a logical tunnel generated between the UE 100 and the PGW 540 (UE (100) -eNB (510) -SGW (520) -PGW (540)) The MME 530 may control the creation, change, and release of the tunnel.

The PGW 540 may allocate an IP address to the UE 100. At this time, the IP address may be assigned through the UE 100 access procedure defined in 3GPP, not the DHCP protocol. In addition, the PGW 540 may perform anchoring for the SGW 520.

The OCS 550 may centrally manage the residual usage (Balance or Credit) for real-time usage for each UE 100 when using the prepaid in the UE 100. Here, real-time usage may be managed by the PGW 540 and the residual usage may be delivered to the OCS 550. At this time, the OCS 550 may notify the PGW 540 of the corresponding information so that the service can no longer be used for the UE 100 using all the remaining usage.

The OFCS 560 may receive and manage the CDRs transmitted by the PGW 540 from the center.

The SPR 570 may store policy and charging rules for each UE 100. Accordingly, the PCRF 580 may obtain information about the UE 100 from the SPR 570.

The PCRF 580 may be a device that determines rules for policies and billing for each UE 100. At this time, the policy may be QoS information to be used by the UE 100, and the charging may be information on whether to perform offline charging or online charging.

The PDN 590 is a public data network, and may be, for example, the Internet or an IP network.

The CSCF 710 is a function in charge of a part related to call processing, and may include ICGW (Incoming CAll GateWay), CCF (Call Control Function), SPD (Serving Profile Database), and AH (Address handling).

The TAS 720 may be a server that processes calls. In addition, the TAS 720 includes a subscriber database, an interworking interface, and can perform the functions of billing, operation, administration, and maintenance (OAM).

The MGCF 730 may perform signal conversion for interworking with the PSTN 350, ISUP (ISDN User Part), and CDMA used in the SIP and circuit switched network. For example, a voice call coming up from 3G through the PSTN 350 may be converted.

The SCC AS 740 may provide continuity of radio resources of the UE 100. For example, in a voice call using LTE or VoLTE, the voice call may be handed over to 3G or 2G so that the voice call is not disconnected where there is no LTE network. The SCC AS 740 may roam, for example, a voice call based on VoLTE into a voice call based on 2G or 3G. At this time, the roaming method may be a method of handing over a VoIP call to a CS (Circuit Switched) call.

The MGW 750 may be a gateway that serves to connect with the MGCF 730, and for interworking between the first network 300 and the second network 500 connected to the CSCF 710, signaling is performed. And can convert media.

The HLR 760 may be a central database of an LTE network having key information for authentication for each UE 100, subscriber profiles, subscriber location information, and the like. At this time, the subscriber profile may include quality of service (QoS) rating information suitable for a service product subscribed to by each subscriber, for example, priority, maximum available bandwidth, and the like.

The MRF 770 may provide a media source in the IMS network 700. In addition, the MRF 700 can manage a call guidance broadcast provided to the UE 100, and can operate as a server for group calls.

The following is an example of a data session update method occurring in a data network system according to an embodiment of the present invention.

Recently, as the spread of wireless terminals (UEs) such as smart pads, tablet PCs, and smart phones increases, wireless terminals using LTE networks are increasing to provide better services than 3G.

At this time, the wireless terminal may be handed over to the 2G or 3G network if it is outside the scope of the LTE network. Here, when the wireless terminal becomes a handover (SRVCC) at the update time (Refesh Timer) of the wireless terminal, the call of the wireless terminal may be terminated because the data session of the wireless terminal is not updated until the update time expires. .

Therefore, in the data session update method according to an embodiment of the present invention, immediately after updating the remote leg and transmitting the data session in the SCC AS, the update session is immediately delivered to at least one node existing in the IMS network. It can be updated, thereby preventing the situation in which the data session ends and the call ends.

FIG. 2 is a configuration diagram illustrating the data session updating apparatus shown in FIG. 1. Referring to Figure 2, the data session update apparatus 780 according to an embodiment of the present invention, the message receiving unit 781, the message retransmission unit 783, the response receiving unit 785, the update transmission unit 787 It may include. At this time, the UE 100 of FIG. 1 is defined as a wireless terminal 100, and the MSC 330 is defined as a terminal exchange device 330. In addition, the operation of the data session update device 780 may be performed by the SCC AS 740 or may be performed by other servers.

The message receiving unit 781 receives an Invite Message based on the handover of the wireless terminal 100 from the terminal switching device 330. In this case, the handover-based in-byte message may be a message based on initiation of session transfer (STN-SR (Session Transfer Number for SRVCC)).

The message retransmission unit 783 may retransmit the in-byte message to at least one node included in the IMS network 700 based on the received in-byte message. Preferably, the message retransmission unit 783 may retransmit the in-byte message to all nodes included in the IMS network 700 based on the received in-byte message.

The response receiving unit 785 receives a response to the re-transmitted byte message from any node included in the IMS network 700. In this case, the response to the in-byte message may be, for example, 200 OK.

When receiving the response to the in-byte message, the update transmission unit 787 may transmit the update message to at least one node included in the IMS network 700. For example, if the data session of the wireless terminal 100 is not updated, not only the terminal but also the node of the transiting IMS network 700 deletes the call, and thus, update processing must be performed for all transit nodes. Accordingly, the update transmission unit 787 may transmit an update message to at least one node included in the IMS network 700, preferably to all via nodes. At this time, the update message may be transmitted after receiving the response, transmitting the data session of the wireless terminal 100, and updating the remote leg. Preferably, the update message may be transmitted before receiving the response, passing the data session of the wireless terminal 100 and updating the remote leg, before the release operation of the IMS connection leg occurs. Also, the update message may be a message for updating a data session of the wireless terminal 100 (Refesh).

In the data session update method according to an embodiment of the present invention, the SCC AS 740 existing in the IMS network 700 is mainly described, but the terminal switching apparatus 330 capable of determining that the wireless terminal 100 is the SRVCC It is also possible to generate an update message.

That is, in another embodiment of the present invention, the terminal switching device 330 transmits an in-byte message based on handover of the wireless terminal 100 to the IMS network 700, and IMS based on the transmitted in-byte message. A response to an in-byte message is received from any node included in the network 700, and when receiving the response, an update message may be transmitted to at least one node included in the IMS network 700.

The details not described for the data session update method of FIG. 2 can be easily inferred from the same or described contents of the data session update method through FIG. 1, and thus the description thereof will be omitted.

3 is a diagram illustrating a process in which data is transmitted and received between each of the components included in the data network system of FIG. 1 according to an embodiment of the present invention. Hereinafter, an example of a process in which data is transmitted and received between each configuration will be described with reference to FIG. 3, but the present application is not limited to such an embodiment, and is illustrated in FIG. 3 according to various embodiments described above. It is apparent to those skilled in the art that the process of transmitting and receiving data can be changed.

At this time, in FIG. 3, capital letter O is defined as originating, and capital letter T is defined as terminating. For example, UE (0) may mean an originating terminal, and UE (T) may mean an incoming terminal.

Referring to Figure 3, UE (0) (100 (0) transmits measurement reports (Measurement Reports) to the source eNB 510 for initiating a handover (S3100). Then, the eNB 510 is QoS , SRVCC operation based on the allocated bearer and priority, that is, determines whether handover should occur (S3200), and notifies the MME 530 when the handover is determined (S3300).

The MME 530 starts the bearer separation (S3400), and when a request to change from PS to CS is transmitted to the MSC 330 (S3500), the MSC 330 is handed to the MSC (T) (330 (T)). A request to prepare for the over is transmitted (S3610).

MST (T) (330 (T)) sends a location reset request to RNC 320 (S3620), and upon receiving a response to the request from RNC 320 (S3630), handover to MSC 330 A response indicating that it is ready is transmitted (S3640).

Then, a line is connected between the MSC 330 and the MSC (T) 330 (T) (S3700), and the MSC 330 transmits an in-byte message based on the start of the session movement to the SCC AS 740 ( S3800), the SCC AS 740 sends an in-byte message to the UE (T) 100 (T) via at least one node (720 (O), 720 (T)) existing in the IMS network 700. Retransmit, and receive a response to this (S3810 ~ 3860).

When receiving the response to the in-byte message, the SCC AS 740 sends a response message to the MSC 330 (S3870), performs session movement and remote leg update (S3880), and releases the IMS connection leg Before performing (S3893), by sending an update message to at least one node existing in the IMS network 700 (S3890 ~ S3892), the data session is updated (Refesh), so that the call connection is not terminated.

Meanwhile, when the MSC 330 receives a response from the SCC AS 740, the SRVCC response is transmitted to the MME 530 (S3900), and the MME 530 receiving the response sends a handover command to the eNB 510. Then (S3910), eNB (510) transmits it back to the UE (O) (100 (O)) (S3920). At this time, the UE (O) 100 (O) is handed over from the second network 500, for example, the LTE network, to the first network 300, for example, the 3G network (S3930).

Then, when handover detection occurs in the RNC 320 (S3940), the UE (O) (100 (O)) sends the handover completion message to the MSC 330 via the MSC (T) (330 (T)). It is transmitted to (S3950, S3960). Here, the MSC 330 reports that the SRVCC operation is completed to the MME 530 (S3970), and receives a response to the report (S3980).

Meanwhile, a method for updating a data session according to another embodiment of the present invention may be made by a method of transmitting an update message from the MSC 330 to at least one node existing in the IMS network 700 after step S3880. Here, other steps are duplicated with the above description, and thus will be omitted.

Since the data session update method of FIG. 3 is not described, the description of the data session update method of FIG. 1 and FIG. 2 may be easily inferred from the same or described contents, and thus the description thereof will be omitted. .

The order between the above-described steps (S3100 to S3980) is only an example, and is not limited thereto. That is, the order between the above-described steps (S3100 to S3980) may be mutually variable, some of which may be executed or deleted simultaneously.

4 is an operation flowchart illustrating a data session update method according to an embodiment of the present invention. Referring to FIG. 4, the data session updating apparatus receives an Invite Message based on handover of the wireless terminal from the terminal switching apparatus (S4100).

Here, the apparatus for updating the data session retransmits the byte message to at least one node included in the IMS network based on the received byte message.

In addition, the data session update device receives a response to an in-byte message retransmitted from any node included in the IMS network.

In addition, when receiving a response, the data session update device transmits an update message to at least one node included in the IMS network.

The description of the data session update method of FIG. 4 is not the same as that described for the data session update method of FIGS. 1 to 3, or can be easily inferred from the description, so the description below will be omitted. .

The method for updating a data session according to an embodiment described with reference to FIG. 4 may also be implemented in the form of a recording medium including instructions executable by a computer, such as an application or program module executed by a computer. Computer readable media can be any available media that can be accessed by a computer and includes both volatile and nonvolatile media, removable and non-removable media. In addition, computer readable media may include both computer storage media and communication media. Computer storage media includes both volatile and nonvolatile, removable and non-removable media implemented in any method or technology for storage of information such as computer readable instructions, data structures, program modules or other data. Communication media typically include computer readable instructions, data structures, program modules, or other data in a modulated data signal such as a carrier wave, or other transport mechanism, and includes any information delivery media.

The above description of the present invention is for illustration only, and those skilled in the art to which the present invention pertains can understand that it can be easily modified to other specific forms without changing the technical spirit or essential features of the present invention. will be. Therefore, it should be understood that the embodiments described above are illustrative in all respects and not restrictive. For example, each component described as a single type may be implemented in a distributed manner, and similarly, components described as distributed may be implemented in a combined form.

The scope of the present invention is indicated by the following claims rather than the above detailed description, and it should be interpreted that all changes or modified forms derived from the meaning and scope of the claims and equivalent concepts thereof are included in the scope of the present invention. do.

When providing SRVCC service of VoLTE in a mixed environment of 3GPP LTE network and legacy network, a method and apparatus for providing call continuity according to an embodiment of the present invention may be used. Here, the legacy network may include an environment in which various mobile communication systems such as a wideband code division multiple access (WCDMA) mobile communication system, a global system for mobile (GSM), and a CDMA 2000 mobile communication system are mixed.

According to an embodiment of the present invention, when providing the SRVCC service of VoLTE in a mixed environment of 3GPP LTE network and legacy network, it is possible to update the data session so that the call does not end at the time of update.

Claims (5)

In the data session update method executed in the data session update device,
Receiving an Invite Message based on handover of the wireless terminal from the terminal switching device;
Retransmitting the byte message to at least one node included in the IMS network based on the received byte message;
Receiving a response to the retransmitted byte message from any node included in the IMS network;
When receiving the response, transmitting an update message to at least one node included in the IMS network after transferring the data session of the wireless terminal and updating the remote leg and before performing release of the IMS access leg.
That includes, the data session update method. According to claim 1,
The update message is a message for updating the data session of the wireless terminal. delete ◈ Claim 4 was abandoned when payment of the set registration fee was made.◈ In the data session update device,
A message receiving unit receiving an Invite Message based on handover of a wireless terminal from a terminal switching device;
A message re-transmission unit for retransmitting the in-byte message to at least one node included in the IMS network based on the received in-byte message;
A response receiving unit that receives a response to the retransmitted in-byte message from any node included in the IMS network; And
When receiving the response, an update that transmits an update message to at least one node included in the IMS network after transferring the data session of the wireless terminal and updating the remote leg and before performing release of the IMS access leg Transmission
Data session update device comprising a. ◈ Claim 5 was abandoned when payment of the set registration fee was made.◈ In the data session update method executed in the data session update device,
Transmitting an in-byte message based on handover of the wireless terminal to the IMS network;
Receiving a response to the byte message from any node included in the IMS network based on the transmitted byte message; And
When receiving the response, transmitting an update message to at least one node included in the IMS network after transferring the data session of the wireless terminal and updating the remote leg and before performing release of the IMS access leg.
Including, data session update method.

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