KR101404203B1 - Automatically resolution changing terminal in IMS network and method thereof - Google Patents

Abstract

The present invention provides a terminal and a method capable of securing the quality of a video call by searching for an optimal resolution considering all elements that determine a video call resolution in order to determine an optimal resolution in a video call in an integrated IMS network environment The purpose is. In order to achieve the above object, there is provided a terminal for automatically changing a video call resolution in an integrated IMS network environment, comprising: a communication unit for communicating with another terminal through a network; a network state measurement unit for measuring and analyzing the state of the network; And a resolution changing unit for changing the resolution of the video call according to the state of the network and the system state. The present invention also provides a terminal for automatically changing a video call resolution according to an integrated IMS network environment.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a terminal for automatically changing a video call resolution according to an integrated IMS network environment,

The present invention is a method for securing video call quality in an integrated IMS network environment. There are some places where the internet network is good, but there are many places that do not. Therefore, there is no problem in high-resolution (definition of VGA or higher image resolution is defined as high resolution) in a place where the bandwidth (bandwidth) of the network is good, but in a place where network bandwidth is poor, There is a break and a stop phenomenon occurs. The present invention relates to a terminal and a method for automatically changing a low-resolution video call so that a video call can be performed.

There are some places where the internet network is good, but there are many places that do not. Therefore, there is no problem in a high-resolution (VGA or higher image resolution is defined as a high resolution) video in a network where bandwidth is good, but in a network bandwidth is poor, a high-resolution video call causes a video interruption and a stoppage Occurs. Conventionally, there is no method for automatically changing a low-resolution video call and making a video call in such a place.

For example, to describe a video call between a smart home pad and a Kibot 2 that are currently applied to the integrated IMS of KT, most people who use video call in Korea do not have a big problem even if they support high resolution. However, since the network condition is not good when a domestic network is in a bad place or when a user makes a video call with an overseas user, a problem occurs in the quality of a video call when a high-resolution call is made. This is because the default resolution setting value is set to a default value for each terminal. This is because there is no terminal that can automatically change the setting in consideration of the bandwidth of the network. Therefore, although the video call is made at a high resolution, the quality of the video call is inevitably deteriorated because the video terminal does not change the resolution again according to the network status in the video terminal even if the network condition is poor.

Although the terminal has a default value that supports a high-resolution video codec, there is no terminal that has an interface for setting this. Depending on network conditions, there is no way to reset it manually. For example, if you want to take a smart home pad overseas and talk to a domestic user, you can easily find out. In other words, in China, which has a large area in Asia, the average network bandwidth that ordinary people subscribe to is 10MB or less. A laptop or a laptop PC is connected to the subscription product and a router is connected to use WIFI to share bandwidth with other devices. In this case, the actual smart home pad connected to WIFI MAX bandwidth can be obtained is often less than 2MB will occur. In this case, in order to support high definition (HD) resolution, at least 2.5MB of MAX bandwidth must be ensured for video call quality, but 0.5MB of bandwidth is insufficient, resulting in poor video quality.

The solution is to set the default resolution to low resolution (CIF: MAX bandwidth 1MB or less). In this case, the resolution can be lowered to guarantee the bandwidth. However, there is no terminal that can set the resolution differently according to the use area.

This is because most terminals set the maximum resolution that they can support to default.

Korean Patent No. 0596945 discloses a method of changing image quality during a video call. However, there is no terminal currently equipped with a countermeasure for the case where MAX bandwidth can not be guaranteed in domestic and overseas video calls. For example, when a video call is being made while a movie is being downloaded from a home PC in Korea, the MAX bandwidth can not be ensured, which may cause image quality problems. In such a case, it is necessary to reduce the resolution to a low resolution so as not to cause a problem in video call, but a terminal operating in such a state is not currently developed. For example, when a multi-party video call is made on a smart home pad, a load of the home pad system may be increased. Because it is a multiparty video call, RTP data comes in from a number of people, so it loads the home pad system in case of high resolution. For example, during a video call, document sharing and web sharing can be performed. In this case, multitasking also increases consumption of CPU and memory in the home pad.

That is, the video call terminal and method so far can automatically change the resolution according to the bandwidth and the state of the counterpart terminal when the bandwidth of the network MAX is not guaranteed during the video call, or automatically when the load of the terminal It has not been possible to prevent degradation of the video call quality due to the load of the terminal by changing the resolution of the call.

The present invention provides a terminal and a method capable of securing the quality of a video call by searching for an optimal resolution considering all elements that determine a video call resolution in order to determine an optimal resolution in a video call in an integrated IMS network environment The purpose is.

In addition, when the resolution is automatically changed according to the bandwidth and the state of the counterpart terminal, or the resolution of the video call is automatically changed when the load on the terminal during the video call is large, It is an object to provide a method.

Other objects of the present invention will become readily apparent from the following description of the embodiments.

The present invention provides a terminal for automatically changing a video call resolution in an integrated IMS network environment, comprising: a communication unit for communicating with another terminal through a network; a network state measurement unit for measuring and analyzing the state of the network; And a resolution changing unit for changing the resolution of the video call according to the state of the network and the system state. The present invention also provides a terminal for automatically changing a video call resolution according to an integrated IMS network environment.

Here, the network state may be a bandwidth of a network to which the terminal and the other terminal are connected, and the system state may be a resolution processing capability of the terminal and the other terminal.

Here, the network status measuring unit may periodically check the network status and the resolution processing capability of the other terminal after a call connection with the other terminal.

Here, the network status may be determined by checking RTP loss and delay and jitter buffer values of the UE.

Here, the resolution changing unit changes the resolution of the video call considering the resolution processing capability of the terminal itself, the resolution processing capability of the other terminal, the bandwidth of the network to which the terminal itself is connected, and the bandwidth of the network to which the other terminal is connected . ≪ / RTI >

A method for automatically changing a video call resolution in an integrated IMS network environment includes: completing automatic opening of a terminal; requesting a state of a network with a DNS server or a gateway; Receiving a response to the status of the network from the DNS server or the gateway; and setting the basic resolution according to the status of the network and the resolution processing capability of the terminal, And a step in which the terminal sets a call with another terminal and performs a video call with the native resolution, and a method for automatically changing a video call resolution according to an integrated IMS network environment.

The method includes the steps of: periodically checking the network status of the video call by the terminal, and determining a bandwidth of the network using the DNS server or the gateway when the network status of the video call is changed Requesting a CSCF server or an SBC (Session Boarder Controller) server to change the resolution of the video call when the terminal determines that the resolution of the video call should be changed according to the status of the network; The CSCF server or the SBS server transmits a resolution change request for the video call and the resolution change to the other terminal to the other terminal; and informing the other terminal of the changed resolution; And changing the video call resolution to the changed resolution by the terminal and the other terminal to perform the video call.

When the bandwidth of the network is 2 Mbps or less, the video call resolution is CIF when the network bandwidth is 2 Mbps or less, CIF when the bandwidth is 2 Mbps to 5 Mbps, VGA when the bandwidth is 5 Mbps to 10 Mbps, or 720 P or more when the bandwidth is 10 Mbps or more And the setting is performed.

Here, the video call resolution may be set to QCIF when the CPU load of the terminal is 70% or more, and to CIF when the load is between 60% and 70%.

Here, the video call resolution is set to QCIF when the memory load of the terminal is 70% or more, and to CIF when the memory load is 60% to 70%.

Here, the video call resolution may be set to QCIF when the remaining battery power of the terminal is less than 10%.

The present invention has an effect of always maintaining video call quality by searching for an optimal video call state and performing a video call.

In addition, there is an effect that the user can enjoy the video call more conveniently according to the bandwidth.

In addition, even when MAX bandwidth can not be guaranteed in domestic and overseas video communication, image quality can be maintained and video communication can be performed.

In addition, there is an effect that the video call use time can be increased by automatically changing the video call resolution according to the battery remaining amount or the load of the terminal during the video call so as to reduce battery consumption or load.

1 is a block diagram of a terminal for automatically changing a video call resolution according to an IMS network environment according to an embodiment of the present invention.
2 is a diagram illustrating a terminal software structure according to an embodiment of the present invention.
3 is a diagram illustrating a procedure for determining a basic resolution after automatic opening according to an embodiment of the present invention.
4 is a diagram illustrating a procedure for changing a resolution during a video call according to an exemplary embodiment of the present invention.
5 is a flowchart illustrating a method of automatically changing a video call resolution according to a load of a terminal during a video call according to an exemplary embodiment of the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS The present invention is capable of various modifications and various embodiments, and specific embodiments are illustrated in the drawings and described in detail in the detailed description. It is to be understood, however, that the invention is not to be limited to the specific embodiments, but includes all modifications, equivalents, and alternatives falling within the spirit and scope of the invention.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The singular expressions include plural expressions unless the context clearly dictates otherwise.

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

1 is a block diagram of a terminal for automatically changing a video call resolution according to an IMS network environment according to an embodiment of the present invention.

The terminal 100 of the present invention includes a communication unit 110, a network state measurement unit 120, and a resolution change unit 130.

The communication unit 110 communicates with another terminal (that is, a receiving terminal) through a network. To this end, the communication unit 110 includes a communication module. The terminal 100 includes a wireless communication module when it is a wireless terminal and a network communication module that can perform communication through IP when the terminal 100 is an IP-phone.

The network state measuring unit 120 performs a function of measuring and analyzing the state of the network. For this, the network status measuring unit 120 communicates with the DNS server or the GW to make a request for the network status, and receives a response to the network status to analyze the network status.

The resolution changing unit 130 changes the resolution of the video call according to the state of the network and the system state.

The resolution changing unit 130 changes the resolution of the video call in consideration of the network state analyzed by the network state measuring unit 120 and the resolution processing capability of the terminal.

The resolution changing unit 130 of the terminal 100 periodically measures the battery state and the load state of the terminal during the video call with the other terminal 500 and may change the resolution according to the battery state and the load state .

Here, the resolution processing capability of the terminal can be determined in consideration of the CPU speed of the terminal 100, the resolution implementation capability of the display module, the support range of the codec, and the state of the battery.

2 is a diagram illustrating a terminal software structure according to an embodiment of the present invention.

The software structure of the terminal of the present invention is composed of (1) a service application, (2) a protocol stack driver, and (3) an Android kernel. For the sake of simplicity, here is an example of the Android operating system, not limited to the Android operating system.

① Service Application consists of Call Application (11), SMS / MMS Application (12), Speed Measurement Application (13), and Other Application (14).

The call application (11) area is an area occupied by an application program that sets up a call, and the SMS / MMS application (12) area is a message processing area. The speed measurement application (13) The area occupied by the application program that measures the communication speed status, and the area of other application (14) is the area occupied by other application programs.

(2) The protocol stack driver is divided into the Voip Signal Engine (21) responsible for video signals and the Media Engine (23) responsible for video media.

In the present invention, the resolution signal interface 22 for checking the status of the network and the resolution controller 22 for automatically changing the video resolution to the Media Engine 23 according to the status of the network and the system status are connected to the Voip Signal Engine 21, The module (24) is further configured.

Here, the function of the resolution signal interface 22 is implemented through the network state measurement unit 120 of the terminal 100.

Here, the function of the resolution control module 24 is implemented through the resolution changing unit 120 of the terminal 100.

③ The Android kernel is the operating area of the Android operating system.

3 is a diagram illustrating a procedure for determining a basic resolution after automatic opening according to an embodiment of the present invention.

In operation S100, the terminal 100 is automatically opened (connected) with the terminal 100 and the opening server 300 on the network when the terminal 100 is connected to the network.

Step S110 is a step of requesting the Resolution Control Module 24 of the AT 100 to confirm the status of the network currently connected to the Resolution Signal Interface 22.

In step S120, the resolution signal interface 22 of the AT 100 requests the DNS server 200 or the gateway 200 for the network status.

In step S130, the DNS server 200 or the gateway 200 responds to the network status requested by the terminal 100. [

In step S140, the resolution signal interface 22 of the AT 100 analyzes the response to the network status to determine the status of the network and informs the resolution control module 24 of the status. Here, the state of the network means the bandwidth of the network determined by checking the RTP loss and delay and jitter buffer values of the UE.

In step S150, the resolution control module 24 of the AT 100 determines a basic video call resolution in consideration of the state of the network and the resolution processing capability of the AT.

Here, the basic video call resolution is set to QCIF when the bandwidth of the network is 2 Mbps or less, CIF when the bandwidth is between 2 Mbps and 5 Mbps, VGA when the bandwidth is 5 Mbps to 10 Mbps, and 720 P or more when the bandwidth is 10 Mbps or more have.

In step S160, the resolution control module 24 of the terminal 100 informs the resolution setting result to the resolution signal interface 22, and changes the state to the call incoming setting enabled state.

4 is a diagram illustrating a procedure for changing a resolution during a video call according to an exemplary embodiment of the present invention.

In the present invention,

1) Codec Capability of calling terminal

2) Network bandwidth state of the calling terminal

3) Codec Capability of the receiving terminal

4) Network bandwidth state of the receiving terminal

The video call resolution can be automatically changed.

Hereinafter, the video call resolution is changed according to the state of the network (the network bandwidth state of the calling terminal, the network bandwidth state of the receiving terminal) and the resolution processing capability of the terminal (the codec capability of the calling terminal and the codec capability of the receiving terminal) Explain the method.

In operation S200, the terminal 100 periodically checks the network status during a video call with another terminal 500. [

Here, the network status can be determined by periodically checking the RTP loss and the delay and jitter buffer values of the AT 100 in the Resolution Control Module 24 of the AT 100. [

In step S210, when it is determined that the resolution of the video call is required to be changed in the resolution control module 24 of the AT 100, it is requested to check the network status using the resolution signal interface 22.

That is, when it is determined that the resolution control module 24 of the Media Engine 23 of the terminal 100 checks the RTP loss, delay and jitter buffer values, and changes the resolution, the resolution is changed to the Voip signal engine 21 It sends a request.

In step S220, the resolution signal interface 22 of the terminal 100 requests the status (bandwidth) of the network using the DNS server or the gateway, receives a response thereto, and confirms the network status (bandwidth) to be. That is, the status of the network is checked once more and the network speed response is determined.

Step S240 is a step of requesting the CSCF server 400 or the SBS server 400 to change the resolution of the video call when the terminal 100 determines that the resolution of the video call should be changed according to the state (bandwidth) of the network to be.

Here, the terminal 100 can send the resolution change request to the SIP: UPDATE message to the SBS server 400 when it is NAT, and to the CSCF server 400 when it is the authorized IP.

In step S250, the CSCF server 400 or the SBS server 400 transmits a resolution change request to the other terminal 500 and negotiates the resolution resolution.

Here, the other terminal 500 sets a changeable resolution in consideration of the resolution processing capability of the other terminal 500 and the bandwidth of the network to which the other terminal 500 itself is connected.

In step S260, the other terminal 500 informs the terminal 100 of the changed resolution.

The other terminal 500 may respond to the SIP: UPDATE message of the terminal 100 with a SIP: 200 OK response.

In step S270, the resolution control module 24 informs the Resolution Control Interface 24 of the resolution signal interface 22 of the terminal 100 and the terminal 500 of the changed resolution.

In step S280, the resolution of the video call resolution is automatically changed by the resolution control module 24 of the terminal 100 and the terminal 500 with the changed resolution.

Here, the change resolution of each terminal is set to QCIF when the bandwidth of the network is 2 Mbps or less, CIF when the bandwidth is between 2 Mbps and 5 Mbps, VGA when the bandwidth is between 5 Mbps and 10 Mbps, and 720 P or more when the bandwidth is 10 Mbps or more .

5 is a flowchart illustrating a method of automatically changing a video call resolution according to a load of a terminal during a video call according to an exemplary embodiment of the present invention.

The terminal of the present invention can determine the resolution of the video call according to the battery state or the load state of the terminal during a video call It is possible to reduce the load on the terminal by automatically changing it. Here, the load state of the terminal means a CPU load or a memory load.

In operation S500, the terminal 100 of the present invention performs a video call with another terminal 500 through the process of FIG.

In step S501, it is determined whether the remaining battery power is less than 10% during the video call. If the remaining battery level is 10% or less, the process goes to step S505 and the video call resolution is changed to QCIF to perform video communication.

The terminal 100 of the present invention can periodically check the battery level of the terminal 100 during a video call.

In step S502, if the battery remaining amount of the terminal 100 is 10% or more, the load state of the terminal is measured and it is determined whether the load of the terminal is 60% or more.

If the load of the terminal is less than 60%, the process goes to step S503 and the video call resolution is maintained at the optimal resolution by performing the steps described in FIG.

In step S504, if the load of the terminal is 60% or more, the terminal checks whether the load is 70% or more. If the load of the terminal is 70% or more, the flow advances to step S505 to change the video call resolution to QCIF to perform video call. If the load is 70% or less, that is, if the load of the terminal is between 60% and 70%, the flow advances to step S506 to change the video call resolution to CIF to perform a video call.

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 as defined in the following claims And changes may be made without departing from the spirit and scope of the invention.

100: terminal
110:
120: network state measurement unit
130: resolution changing section
200: Domain Name System (DNS) server or gateway
300: Opening server
400: a Call Session Control Function (CSCF) server or a Session Border Controller (SBC) server
500: other terminal

Claims (11)

A terminal for automatically changing a video call resolution in an integrated IMS network environment, comprising: a communication unit for communicating with another terminal through a network; A network state measurement unit for measuring and analyzing the state of the network; And a resolution changing unit for changing a resolution of the video call according to the state of the network and the system state. And,
The resolution changing unit may change the resolution processing capability of the terminal itself, the resolution processing capability of the other terminal, the bandwidth of the network to which the terminal itself is connected and the bandwidth of the network to which the other terminal is connected, And the resolution of the video call is changed according to a result of the measurement. The terminal of claim 1, wherein the video call resolution is automatically changed according to the integrated IMS network environment. The method according to claim 1,
Wherein the network state is a bandwidth of a network to which the terminal and the other terminal are connected, and the system state is a resolution processing capability of the terminal and the other terminal. According to an integrated IMS network environment, The terminal to change. The method according to claim 1,
Wherein the network status measuring unit measures the network status and the resolution processing capability of the other terminal periodically after the call connection with the other terminal is performed, and automatically changes the video call resolution according to the integrated IMS network environment. The method of claim 3,
Wherein the network status is determined by checking an RTP loss and a delay and a jitter buffer value of the terminal, and automatically determines a video call resolution according to the integrated IMS network environment. delete A method for automatically changing a video call resolution in an integrated IMS network environment includes: completing automatic opening of a terminal; Requesting a state of a network by the terminal to a DNS server or a gateway; Receiving a response to the status of the network from the DNS server or the gateway; Setting a basic resolution according to the state of the network or the resolution processing capability of the terminal itself; And a step in which the terminal sets a call with another terminal and performs a video call with the basic resolution; , ≪ / RTI &
The resolution processing capability of the terminal itself, the resolution processing capability of the terminal, the bandwidth of the network to which the terminal itself is connected, and the bandwidth of the network to which the other terminal is connected, Measuring a battery state and a load state of the terminal periodically while performing a video call with the other terminal, and changing a resolution of the video call according to a result of the measurement; The method of automatically changing the video call resolution according to the integrated IMS network environment. The method according to claim 6,
The terminal periodically checking a network status of the video call;
Determining a bandwidth of the network using the DNS server or the gateway when the network status of the video call is changed;
Requesting the CSCF server or the SBS server to change the resolution of the video call when the terminal determines that the resolution of the video call should be changed according to the status of the network;
The CSCF server or the SBS server negotiating a resolution change request for the video call and a change resolution with the other terminal to the other terminal;
Informing the other terminal of the changed resolution; And
Performing the video call by changing the video call resolution to the changed resolution by the terminal and the other terminal; Wherein the method further comprises the step of automatically changing the video call resolution according to the integrated IMS network environment. 8. The method according to claim 6 or 7,
The video call resolution may be,
Wherein when the bandwidth of the network is not more than 2 Mbps, it is set to be QCIF, when the bandwidth is between 2 Mbps and 5 Mbps, to CIF, when the bandwidth is between 5 Mbps and 10 Mbps, VGA and when the bandwidth is 10 Mbps or more, How to automatically change video call resolution according to network environment. The method according to claim 6,
Wherein the video call resolution is set to QCIF when the CPU load of the terminal is 70% or more, and to CIF when the load is between 60% and 70%. The method according to claim 6,
Wherein the video call resolution is set to QCIF when the memory load of the terminal is 70% or more, and to CIF when the memory load is 60% to 70%. The method according to claim 6,
Wherein the video call resolution is set to QCIF when the remaining battery power of the terminal is 10% or less.

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