KR20130131772A - Method and apparatus of processing csfb service for improving voice call success rate - Google Patents

Abstract

The present invention relates to a method of processing a circuit switch fall back (CSFB) service in the 4G core network, evolved packet system (EPS) defined by the 3GPP. According to the present invention, a method of processing a CSFB service providing a circuit switching service on LTE networks, for improving a voice incoming call success rate, comprises the steps of: performing a paging to a receiving terminal according to a voice incoming call in a switching node of a communication system; confirming whether a data originating call is requested by the receiving terminal while performing the paging in the switching node; and performing the paging to the receiving terminal again in the switching node if the data originating call is requested. [Reference numerals] (AA) Start;(BB) End;(S10) Voice incoming call;(S20) Paging to a terminal;(S30) Confirming a data call of a receiving terminal;(S40) Sending out data call?;(S50) Paging to the terminal again;(S60) Processing CSFB normally

Description

Method and apparatus of processing CSFB service for improving voice call success rate}

The present invention relates to an evolved mobile communication network, and more particularly, to a method for processing a Circuit Switch Fall Back (CSFB) service in a 4G Evolved Packet System (EPS) defined by 3GPP.

3GPP Next Generation Core Network (EPS) is an All-IP based system that supports a variety of access networks, including Long Term Evolution (LTE), High-Speed Packet Access (HSPA) / HSPA +, as well as non-3GPP networks.

CS Fallback in 3GPP EPS System is a user equipment (UE) serving in the LTE Evolved UMTS Terrestrial Radio Access Network (E-UTRAN) cell area, which is a network resource of CS (Circuit Switched) area, that is, MSC (Mobile) It is a technology that provides a CS service (for example, video service, SMS, Location Services (LCS), Unstructured Supplementary Service Data (USSD)) using a switching center (MSC) or an MSC server.

CSFB function is used when CS service is not available through EPS network. For reference, EPS is an AIPN (All IP Network) type network and requires interworking with an IMS network to provide services such as voice or SMS. Therefore, when the IMS service is not supported or the IMS function cannot be used in the IPS network, the CSFB function is used. CSFB functionality should be supported by the UE as well as the network.

In relation to the CSFB function, Korean Laid-Open Patent Publication No. 2012-0013114 discloses a configuration in which a LTE network is mixed in a heterogeneous network in which LTE is acquired according to a CSFB method, so that 3G and LTE service use is not overwhelming. Is disclosed.

During the evolution of the network to LTE, the transition to data-based voice services (IMS, mVoIP) is a transitional form of data, LTE and voice CSFB technology using the existing 3G network has been standardized and introduced to the early LTE commercialization operators.

However, since LTE and 3G deployment ranges are different and heterogeneous network transitions inevitably occur whenever a voice service is provided, a single mode terminal cannot simultaneously use data services in an LTE network and a voice service in a 3G network. There is this. In addition, when an incoming call is received at the same time as the transmission attempt at the terminal, there is a problem that the incoming call success rate decreases due to a collision phenomenon.

With the recent increase in the diversification of smartphone applications, the incoming and outgoing calls of data are frequently made even in the idle state. In particular, the degradation of the voice service due to the failure of the voice call when data call and voice call are collided decreases the quality of the data service. The problem is bigger.

The present invention has been made to solve the above problems, and when the CSFB function is provided to a single mode terminal, it improves the phenomenon that the voice call reception fails due to the collision of the data call origination and the voice call incoming, thereby improving the voice call success rate. The purpose is to provide a method for processing CSFB services that can be enhanced.

Other objects and advantages of the invention will be described below and will be appreciated by the embodiments of the invention. Further, objects and advantages of the present invention can be realized by the means and the combination shown in the appended claims.

In order to achieve the above object, the CSFB service processing method for improving the voice call success rate according to the present invention, CSFB (Circuit Switch Fall Back) service processing method for providing a circuit switched network service in an LTE network environment, (a) in the switching node of the communication system, performing paging to the called terminal according to the voice incoming call; (b) checking, at the switching node, with the paging process, whether a data originating call is requested from the called terminal; And (c) the switching node, when the data originating call is requested, performing paging processing again to the called terminal.

According to another aspect of the present invention, a CSFB (Circuit Switch Fall Back) service processing apparatus for classifying circuit switched network services in an LTE network environment, comprising: a paging processing module for performing a paging process to a node or a mobile communication terminal of the core network; A message receiving module for receiving signals and messages from other nodes and mobile communication terminals; And performing paging to the called terminal according to the voice incoming signal, checking whether a data calling is requested from the called terminal along with performing paging processing, and performing a paging process again to the called terminal when the calling data is requested. Provided is a CSFB service processing apparatus for improving a voice incoming call success rate including a paging control module for controlling.

According to another aspect of the present invention, as a recording medium recording a program for performing a circuit switch fall back (CSFB) service processing for providing circuit-switched network services in the LTE network environment, the voice node at the switching node of the communication system, A procedure for performing paging to the called terminal according to the call, a procedure for checking whether a data originating call is requested from the called terminal with the paging processing at the switching node, and the switching node, if a data originating call is requested, A computer-readable recording medium having a program for executing a paging process and a switching node receiving a paging response message from the called terminal and executing a procedure for completing CSFB service processing is provided.

According to the present invention, when paging processing for CSFB according to voice incoming signal from 3G network to a terminal accessing LTE network, resend the paging message to the called terminal according to whether or not the data call is sent from the terminal to send data call. Therefore, it improves the phenomenon that the voice call fails, thereby providing the effect of increasing the voice call success rate.

BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate preferred embodiments of the invention and, together with the description of the invention below, And should not be construed as limiting.
1 is a diagram schematically illustrating a network configuration of a communication system in which the present invention is implemented.
2 is a diagram showing the configuration of a CSFB service processing apparatus for improving the voice call success rate according to an embodiment of the present invention.
3 is a diagram illustrating a procedure of a CSFB service processing method for improving a voice call success rate according to an embodiment of the present invention.
4 is a signal flowchart illustrating a CSFB service processing procedure for improving a voice incoming call success rate according to an embodiment of the present invention for each node of a communication system.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. Prior to this, terms and words used in the present specification and claims should not be construed as limited to ordinary or dictionary terms, and the inventor should appropriately interpret the concepts of the terms appropriately It should be interpreted in accordance with the meaning and concept consistent with the technical idea of the present invention based on the principle that it can be defined. Therefore, the embodiments described in this specification and the configurations shown in the drawings are merely the most preferred embodiments of the present invention and do not represent all the technical ideas of the present invention. Therefore, It is to be understood that equivalents and modifications are possible.

1 is a diagram schematically illustrating a network configuration of a communication system in which the present invention is implemented.

Referring to FIG. 1, a communication system in which the present invention is implemented is a network in which an LTE network and a 3G network are mixed, and the mobile communication terminal 30 is a single mode terminal capable of accessing both an LTE network and a 3G network. The terminal 30 supports the CSFB function.

The 3G network includes an MSC 10, a radio network controller (RNC) 12, an SGSN 11, a base station (Node B: 13), and the like. The LTE network includes an MME 20, a base station (e Node B) 21, and the like. The MME 20 and the MSC 10 communicate via an SGs interface protocol.

The mobile communication terminal 30 is a single mode terminal, that is, a terminal that can not be connected to two types of communication networks at the same time, but can be connected to only one communication network. In addition, the mobile communication terminal 30 and the communication system provide and support a CSFB function. The CSFB function is a circuit switched fall back function. When a single-mode terminal accesses an LTE network to perform data communication or when connected to an LTE network, a voice call or 3G service call occurs in the LTE network. This is a processing function that changes the connection to 3G network.

As described above, when the CSFB function processing procedure is briefly described, when a voice call is generated through the 3G network to the mobile communication terminal 30 connected to the LTE network, the MSC 10 of the 3G network may perform the MME 20 of the LTE network. Paging to notify the incoming voice is performed. Since the terminal is a single mode terminal, the MME 20 transmits a CSFB service request message to the MSC 10 for CSFB processing, transfers control to the 3G network according to CSFB processing, and then sends a voice to the called mobile communication terminal. Perform paging accordingly. The mobile communication terminal 30 receives the paging to confirm the incoming voice, transmits the paging response message to the CSFB 3G network, and proceeds to the incoming processing.

At this time, when the mobile communication terminal 30 accessing the LTE network transmits a data call, conventionally, paging reception and data call origination collide with each other, so that the terminal ignores the paging reception and performs the data call transmission process.

Accordingly, there is a problem in that the voice communication quality decreases due to a decrease in the call success rate for the voice incoming call, and the present invention proposes a CSFB service processing method for improving the call success rate for the voice incoming call.

2 is a diagram showing the configuration of a CSFB service processing apparatus for improving the voice call success rate according to an embodiment of the present invention.

Referring to FIG. 2, the CSFB service processing apparatus 100 according to the present invention includes a paging processing module 110, a message receiving module 120, a paging control module 130, a CSFB processing module 140, and the like. .

In addition, the CSFB service processing apparatus 100 according to the present invention may be provided or included in the LTE network. Preferably, the CSFB service processing apparatus 100 according to the present invention is provided in the MME 20 of the LTE network to operate during call processing or CSFB service processing.

The paging processing module 110 performs a paging process for notifying an incoming call when an incoming call occurs. The paging processing module 110 receives the paging request according to the voice call signal generation from the MSC 10 of the 3G network, and transmits the paging signal to the mobile communication terminal 30 connected to the LTE network or data communication to the LTE network. send.

The message receiving module 120 performs a role of receiving a signal or a message from another node or the mobile communication terminal 30. The message receiving module 120 receives a paging request message according to a voice call signal generation from the MSC 10 of the 3G network, and receives a data call from the mobile communication terminal 30. In addition, the message receiving module 120 may receive an incoming data signal in the LTE network.

On the other hand, the paging request message received from the MSC 10 of the 3G network in the message receiving module 120 communicates through a protocol according to the SGs interface between the exchange nodes between heterogeneous networks.

The paging control module 130 checks whether or not a data call is originated from the mobile communication terminal 30 when paging processing is performed according to a paging request according to an incoming voice call. Control processing to retransmit the paging signal to the mobile communication terminal 30 once again through 110.

That is, when the paging control module 130 receives the paging request signal according to the voice call generation from the MSC 10 of the 3G network to the 3G network in the message receiving module 120, the paging control module 130 accesses the LTE network. The paging signal is transmitted to the called mobile terminal 30 during data communication in the LTE network, and at the same time, a process for checking whether the called mobile terminal 30 transmits a data call is performed. At this time, when it is confirmed that the data call is made in the called-party mobile communication terminal 30, the paging control module 130 transmits the paging signal according to the paging request signal to the called-party mobile communication terminal 30 again. Control to perform the process.

Here, the data call transmitted from the mobile communication terminal 30 of the LTE network may be confirmed through a Service Request message for a data service received from the mobile communication terminal 30. In addition, when the paging signal is retransmitted to the called party's mobile communication terminal 30, the paging process may be performed by retransmitting the CS Service Notification message to the called party's terminal 30.

As such, when the paging control module 130 performs a paging according to an incoming call, when a data call is simultaneously sent from the called terminal, the paging signal according to the incoming voice is ignored at the terminal and prioritizes data transmission. By processing, it is possible to prevent the phenomenon that the voice call incoming fails, that is, according to an embodiment of the present invention, when the above-described paging control module 130 performs paging to the called terminal according to the voice call incoming When the data call origination is confirmed, the paging process is once again performed on the called terminal, and the voice call is received due to the collision caused by simultaneous data call generation and paging. It is possible to prevent the paging of the call from being ignored.

Of course, when the paging control module 130 checks whether the called terminal has transmitted the data call, when the data call is not made, the separate paging signal retransmission procedure is not performed.

The CSFB processing module 140 performs CSFB service processing according to the CSFB processing function and serves to successfully receive an incoming call. That is, the CSFB service request signal is received from the MSC 10 of the 3G network to perform CSFB service processing. In this way, the called party mobile communication terminal, which has CSFB processing and transfers control to the 3G network, transmits a paging response message according to the paging signal to the MSC 10 of the 3G network to complete the final voice call receiving process.

3 is a diagram illustrating a procedure of a CSFB service processing method for improving a voice call success rate according to an embodiment of the present invention.

This embodiment describes a processing procedure performed in the MME 20 of the LTE network, and assumes a state of performing paging processing according to an incoming voice call from the 3G network to a mobile communication terminal connected to the LTE network or performing data communication on the LTE network. Will be explained.

First, a paging request signal according to a voice call incoming request for a mobile communication terminal 30 of an LTE network generated in a 3G network is received at an exchange node (MME).

The switching node transmits a paging signal to the mobile communication terminal 30 which is connected to the LTE network for CSFB processing according to voice reception.

In addition, the switching node proceeds to check whether the data call is sent to the called-party mobile communication terminal 30 that is connected to the LTE network. At this time, the paging signal is transmitted and the data call is transmitted from the corresponding terminal.

As a result of checking whether the data call is originated, it is determined that the paging and the data call signal have collided when the data call is made, and when the data call is not made, it is determined as normal without collision.

If it is confirmed that the data call has been made, a procedure of retransmitting the paging signal according to the paging request is performed to the called terminal 30 of the LTE network. That is, since data call origination is performed together with paging processing at the called terminal 30, voice call reception due to a collision phenomenon fails, so that the paging signal is once again processed to process voice call reception after data call origination processing is performed. Is retransmitted to the terminal. (S50)

On the other hand, after confirming that the data call is not made or performing the paging signal retransmission process, which is the procedure of step S50, the CSFB service is processed without any additional processing, and the voice call is received by the CSFB-processed UE through the 3G network. This is normally done. (S60)

Through this procedure, if a paging signal is transmitted to the terminal along with the CSFB processing according to the voice call origination from the 3G network at the same time as the data call is transmitted from the terminal connected to the LTE network, even if the initial paging signal is ignored due to a collision phenomenon, After the data outgoing signal processing, the paging signal is retransmitted again, so that normal voice call reception processing can be performed. Therefore, according to the embodiment of the present invention, there is an effect that the incoming call success rate of the voice call is improved compared to the conventional.

4 is a signal flowchart illustrating a CSFB service processing procedure for improving a voice incoming call success rate according to an embodiment of the present invention for each node of a communication system.

Referring to FIG. 4, an incoming call processing procedure in which a voice incoming signal occurs to a UE UE1 that is connected to an LTE network, and a processing procedure in the case where a data call is transmitted simultaneously with an attempt to make a voice call from the UE UE1. Let's explain.

First, the MSC of the 3G network receives a voice call request for the UE (UE # 1) connected to the LTE network. That is, when a voice call is generated through the 3G network according to the CSFB service, a procedure for receiving a voice call through the CSFB service to a terminal connected to the LTE network is performed.

When a voice call is requested from the MSC, a paging request for the corresponding UE (UE # 1) is transmitted to the MME of the LTE network. At this time, the paging request message is transmitted to the protocol according to the SGs interface (S2).

The MME proceeds with a procedure for transmitting a paging signal to the UE (UE # 1) according to the paging request signal. (S3) In addition, the MME transmits a CSFB service request message to the MSC for CSFB service processing. )

At the time of receiving the paging signal, the called terminal UE # 1 attempts to make a data call. That is, while the voice incoming signal is generated through the 3G network, while the paging signal is transmitted to the called terminal UE # 1 of the LTE network, the called terminal UE # 1 simultaneously transmits a data call to cause a collision. (S3 ')

As such, when the paging and the data call origination collide, the terminal ignores the paging and performs a data call origination process (S4).

In accordance with the data call origination processing enforcement, the terminal performs a procedure for requesting a data call to the MME. In this case, a 'Service Request for Data Service' message is transmitted to the MME to request a data call.

Since the MME performs paging to the called terminal UE # 1 and receives a data call origination request from the called terminal, the MME confirms the data call originating from the called terminal.

Since the MME checks the data call origination status at the called terminal at the same time as the paging, the receiving terminal UE # 1 performs a process of retransmitting the paging message once again. In this case, the paging signal message transmitted to the terminal may be, for example, a 'CS Paging Notification' message.

After the data call origination process, the terminal performs a CSFB process as a paging message is received again. That is, since the terminal proceeds with the paging disregarding procedure due to the collision according to the data call origination, the collision does not occur anymore, the paging message is normally received, and the subsequent procedure is normally performed.

After the paging reception, the terminal proceeds with CSFB processing, transmits a paging response message, and then proceeds with normal voice call reception processing (S9).

Through such a procedure, when a collision occurs due to data call origination and voice call reception, additional paging signals are retransmitted after the collision phenomenon is eliminated, so that normal voice call reception can be made again. Therefore, compared with the existing voice call reception success rate is improved to provide an effect.

The method of the present invention as described above may be embodied as a program and stored in a computer-readable recording medium (such as a CD-ROM, a RAM, a ROM, a floppy disk, a hard disk, or a magneto-optical disk).

While the specification contains many features, such features should not be construed as limiting the scope of the invention or the scope of the claims. In addition, the features described in the individual embodiments herein may be combined and implemented in a single embodiment. Conversely, various features described herein in a single embodiment may be implemented in various embodiments individually or in a suitable subcombination.

It is to be understood that, although the operations have been described in a particular order in the figures, it should be understood that such operations are performed in a particular order as shown, or that a series of sequential orders, or all described operations, . In some circumstances, multitasking and parallel processing may be advantageous. It should also be understood that the division of various system components in the above embodiments does not require such distinction in all embodiments. The above-described program components and systems can generally be implemented as a single software product or as a package in multiple software products.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the invention. The present invention is not limited to the drawings.

110: paging processing module 120: message receiving module
130: paging control module 140: CSFB processing module

Claims (11)

A CSFB (Circuit Switch Fall Back) service processing method for providing circuit switched network services in an LTE network environment.
(a) in the switching node of the communication system, performing paging to the called terminal according to the voice incoming call;
(b) checking, at the switching node, with the paging process, whether a data originating call is requested from the called terminal; And
and (c) the switching node, when a data origination call is requested, performing paging processing again to the called terminal. The method of claim 1,
After step (c),
(d) the switching node further comprises the step of completing the requested CSFB service processing according to the reception of the paging response message from the called terminal, the CSFB service processing method for improving the voice incoming success rate. The method of claim 1,
After step (b),
(e) when the data transmission call is not requested, completing the requested CSFB service processing as the paging response message is received at the called terminal; How to Handle CSFB Services The method of claim 1,
The CSFB service processing,
CSFB service processing method for improving the voice call success rate, characterized in that made between the LTE network and the 3G network. The method of claim 1,
The switching node is the MSC or MME, CSFB service processing method for improving the voice call success rate. The method of claim 1,
The step (b)
CSFB service processing method for improving the voice call success rate, characterized in that whether the data originating call is requested through whether or not a service request message for the data service from the called terminal. The method of claim 1,
The step (c)
CSFB service processing method for improving the voice call success rate, characterized in that the paging process by retransmitting the CS Service Notification message to the called terminal. A CSFB (Circuit Switch Fall Back) service processing device that provides a circuit switched network service in an LTE network environment.
Paging processing module for performing the paging process to the node or mobile communication terminal of the core network;
A message receiving module for receiving signals and messages from other nodes and mobile communication terminals; And
Paging to the called terminal according to the voice incoming call, and checks whether the data calling is requested from the called terminal along with the paging process, if the data calling is requested, controls to perform paging processing again to the called terminal CSFB service processing apparatus for improving the voice incoming call success rate comprising; a paging control module. The method of claim 8,
And a CSFB processing module for completing CSFB service processing upon receiving a paging response message from the called terminal. The method of claim 9,
The paging control module,
CSFB service processing apparatus for improving the voice call success rate, characterized in that when the data call is not requested, the CSFB processing module to complete the CSFB service processing. A recording medium in which a program for processing a circuit switch fall back (CSFB) service for providing circuit switched network services in an LTE network environment is recorded.
In a switching node of a communication system, performing a paging to a called terminal according to an incoming voice signal;
At the switching node, along with performing paging processing, checking whether a data originating call is requested from a called terminal;
The switching node performs a paging process again to the called terminal when a data origination call is requested; and
The switching node is a computer-readable recording medium that records a program that executes a procedure for receiving a paging response message from the called terminal to complete a CSFB service process.

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