KR20220168407A - Electronic device and method thereof - Google Patents

Abstract

An electronic device according to various embodiments of the present disclosure may include: at least one communication module supporting connection with a plurality of networks including a first network and a second network; and a processor operatively connected with the at least one communication module. The processor checks a retransmission timeout through the first network, checks whether the checked retransmission timeout is greater than a first threshold, and changes the connection from the first network to the second network when the checked retransmission timeout is greater than the first threshold.

Description

Electronic device and its operating method {ELECTRONIC DEVICE AND METHOD THEREOF}

Various embodiments of the present disclosure relate to an electronic device and an operating method thereof, and more particularly, to an electronic device using network communication and an operating method thereof.

Recently, electronic devices may include many functions that can be used in connection with other electronic devices in addition to functions that can be used alone. For example, an electronic device includes a messenger function, so that a message can be transmitted to or received from another user's electronic device. As another example, a user may install a video streaming application on an electronic device, and the electronic device may download and play a video from a server.

A user may own one electronic device, but may own a plurality of electronic devices for different purposes. As a result, the number of electronic devices connected to and communicating with other electronic devices is increasing exponentially.

A delay may occur while an electronic device performs a function using network communication. The user may not know whether the cause of the delay is a problem on the network, a problem in the function itself, or whether the user's inexperienced operation is the problem. If the electronic device can determine the cause of the delay, different solutions may be applied depending on the cause.

An electronic device according to various embodiments of the present disclosure includes at least one communication module supporting connection to a plurality of networks including a first network and a second network, and a processor operatively connected to the at least one communication module. The processor checks a retransmission timeout through the first network, checks whether the checked retransmission timeout is greater than a first threshold, and if the checked retransmission timeout is greater than the first threshold, the second A connection may be changed from the first network to the second network.

An operating method of an electronic device according to various embodiments of the present disclosure includes an operation of checking a retransmission timeout through a first network, an operation of determining whether the checked retransmission timeout is greater than a first threshold value, and an operation of checking whether the checked retransmission timeout is If it is greater than the first threshold, an operation of changing the connection from the first network to the second network may be included.

According to various embodiments of the present disclosure, when a delay occurs while performing a function interworking with a network, the electronic device may determine the cause.

According to various embodiments of the present disclosure, the electronic device can apply different solutions according to the cause of the delay, so that the user's satisfaction in using the electronic device can be increased.

1 is a block diagram of an electronic device in a network environment according to various embodiments.
2 is a graph comparing RTO and RTT according to a network connection state of an electronic device.
3A and 3B are flowcharts for determining the cause of delay by the electronic device according to the first embodiment.
4 illustrates an example in which a user moves and uses an electronic device.
5 illustrates changes in variables depending on whether a delay occurs in an electronic device according to a first embodiment.
6 is a flowchart for determining a cause of a delay by an electronic device according to a second embodiment.
7 illustrates changes in variables depending on whether a delay occurs in an electronic device according to a second embodiment.
8 is a flowchart for determining a cause of a delay by an electronic device according to a third embodiment.
9 illustrates changes in variables depending on whether a delay occurs in an electronic device according to a third embodiment.

1 is a block diagram of an electronic device 101 within a network environment 100, according to various embodiments. Referring to FIG. 1 , in a network environment 100, an electronic device 101 communicates with an electronic device 102 through a first network 198 (eg, a short-range wireless communication network) or through a second network 199. It may communicate with at least one of the electronic device 104 or the server 108 through (eg, a long-distance wireless communication network). According to an embodiment, the electronic device 101 may communicate with the electronic device 104 through the server 108 . According to an embodiment, the electronic device 101 includes a processor 120, a memory 130, an input module 150, an audio output module 155, a display module 160, an audio module 170, a sensor module ( 176), interface 177, connection terminal 178, haptic module 179, camera module 180, power management module 188, battery 189, communication module 190, subscriber identification module 196 , or the antenna module 197 may be included. In some embodiments, in the electronic device 101, at least one of these components (eg, the connection terminal 178) may be omitted or one or more other components may be added. In some embodiments, some of these components (eg, sensor module 176, camera module 180, or antenna module 197) are integrated into a single component (eg, display module 160). It can be.

The processor 120, for example, executes software (eg, the program 140) to cause at least one other component (eg, hardware or software component) of the electronic device 101 connected to the processor 120. It can control and perform various data processing or calculations. According to one embodiment, as at least part of data processing or operation, processor 120 transfers instructions or data received from other components (e.g., sensor module 176 or communication module 190) to volatile memory 132. , processing commands or data stored in the volatile memory 132 , and storing resultant data in the non-volatile memory 134 . According to one embodiment, the processor 120 includes a main processor 121 (eg, a central processing unit or an application processor) or a secondary processor 123 (eg, a graphic processing unit, a neural network processing unit ( NPU: neural processing unit (NPU), image signal processor, sensor hub processor, or communication processor). For example, when the electronic device 101 includes the main processor 121 and the auxiliary processor 123, the auxiliary processor 123 may use less power than the main processor 121 or be set to be specialized for a designated function. can The secondary processor 123 may be implemented separately from or as part of the main processor 121 .

The secondary processor 123 may, for example, take the place of the main processor 121 while the main processor 121 is in an inactive (eg, sleep) state, or the main processor 121 is active (eg, running an application). ) state, together with the main processor 121, at least one of the components of the electronic device 101 (eg, the display module 160, the sensor module 176, or the communication module 190) It is possible to control at least some of the related functions or states. According to one embodiment, the auxiliary processor 123 (eg, an image signal processor or a communication processor) may be implemented as part of other functionally related components (eg, the camera module 180 or the communication module 190). there is. According to an embodiment, the auxiliary processor 123 (eg, a neural network processing device) may include a hardware structure specialized for processing an artificial intelligence model. AI models can be created through machine learning. Such learning may be performed, for example, in the electronic device 101 itself where the artificial intelligence model is performed, or may be performed through a separate server (eg, the server 108). The learning algorithm may include, for example, supervised learning, unsupervised learning, semi-supervised learning or reinforcement learning, but in the above example Not limited. The artificial intelligence model may include a plurality of artificial neural network layers. Artificial neural networks include deep neural networks (DNNs), convolutional neural networks (CNNs), recurrent neural networks (RNNs), restricted boltzmann machines (RBMs), deep belief networks (DBNs), bidirectional recurrent deep neural networks (BRDNNs), It may be one of deep Q-networks or a combination of two or more of the foregoing, but is not limited to the foregoing examples. The artificial intelligence model may include, in addition or alternatively, software structures in addition to hardware structures.

The memory 130 may store various data used by at least one component (eg, the processor 120 or the sensor module 176) of the electronic device 101 . The data may include, for example, input data or output data for software (eg, program 140) and commands related thereto. The memory 130 may include volatile memory 132 or non-volatile memory 134 .

The program 140 may be stored as software in the memory 130 and may include, for example, an operating system 142 , middleware 144 , or an application 146 .

The input module 150 may receive a command or data to be used by a component (eg, the processor 120) of the electronic device 101 from the outside of the electronic device 101 (eg, a user). The input module 150 may include, for example, a microphone, a mouse, a keyboard, a key (eg, a button), or a digital pen (eg, a stylus pen).

The sound output module 155 may output sound signals to the outside of the electronic device 101 . The sound output module 155 may include, for example, a speaker or a receiver. The speaker can be used for general purposes such as multimedia playback or recording playback. A receiver may be used to receive an incoming call. According to one embodiment, the receiver may be implemented separately from the speaker or as part of it.

The display module 160 may visually provide information to the outside of the electronic device 101 (eg, a user). The display module 160 may include, for example, a display, a hologram device, or a projector and a control circuit for controlling the device. According to an embodiment, the display module 160 may include a touch sensor configured to detect a touch or a pressure sensor configured to measure the intensity of force generated by the touch.

The audio module 170 may convert sound into an electrical signal or vice versa. According to an embodiment, the audio module 170 acquires sound through the input module 150, the sound output module 155, or an external electronic device connected directly or wirelessly to the electronic device 101 (eg: Sound may be output through the electronic device 102 (eg, a speaker or a headphone).

The sensor module 176 detects an operating state (eg, power or temperature) of the electronic device 101 or an external environmental state (eg, a user state), and generates an electrical signal or data value corresponding to the detected state. can do. According to one embodiment, the sensor module 176 may include, for example, a gesture sensor, a gyro sensor, an air pressure sensor, a magnetic sensor, an acceleration sensor, a grip sensor, a proximity sensor, a color sensor, an infrared (IR) sensor, a bio sensor, It may include a temperature sensor, humidity sensor, or light sensor.

The interface 177 may support one or more designated protocols that may be used to directly or wirelessly connect the electronic device 101 to an external electronic device (eg, the electronic device 102). According to one embodiment, the interface 177 may include, for example, a high definition multimedia interface (HDMI), a universal serial bus (USB) interface, an SD card interface, or an audio interface.

The connection terminal 178 may include a connector through which the electronic device 101 may be physically connected to an external electronic device (eg, the electronic device 102). According to one embodiment, the connection terminal 178 may include, for example, an HDMI connector, a USB connector, an SD card connector, or an audio connector (eg, a headphone connector).

The haptic module 179 may convert electrical signals into mechanical stimuli (eg, vibration or motion) or electrical stimuli that a user may perceive through tactile or kinesthetic senses. According to one embodiment, the haptic module 179 may include, for example, a motor, a piezoelectric element, or an electrical stimulation device.

The camera module 180 may capture still images and moving images. According to one embodiment, the camera module 180 may include one or more lenses, image sensors, image signal processors, or flashes.

The power management module 188 may manage power supplied to the electronic device 101 . According to one embodiment, the power management module 188 may be implemented as at least part of a power management integrated circuit (PMIC), for example.

The battery 189 may supply power to at least one component of the electronic device 101 . According to one embodiment, the battery 189 may include, for example, a non-rechargeable primary cell, a rechargeable secondary cell, or a fuel cell.

The communication module 190 is a direct (eg, wired) communication channel or a wireless communication channel between the electronic device 101 and an external electronic device (eg, the electronic device 102, the electronic device 104, or the server 108). Establishment and communication through the established communication channel may be supported. The communication module 190 may include one or more communication processors that operate independently of the processor 120 (eg, an application processor) and support direct (eg, wired) communication or wireless communication. According to one embodiment, the communication module 190 may be a wireless communication module 192 (eg, a cellular communication module, a short-range wireless communication module, or a global navigation satellite system (GNSS) communication module) or a wired communication module 194 (eg, a : a local area network (LAN) communication module or a power line communication module). Among these communication modules, a corresponding communication module is a first network 198 (eg, a short-range communication network such as Bluetooth, wireless fidelity (WiFi) direct, or infrared data association (IrDA)) or a second network 199 (eg, legacy It may communicate with the external electronic device 104 through a cellular network, a 5G network, a next-generation communication network, the Internet, or a telecommunications network such as a computer network (eg, a LAN or a WAN). These various types of communication modules may be integrated as one component (eg, a single chip) or implemented as a plurality of separate components (eg, multiple chips). The wireless communication module 192 uses subscriber information (eg, International Mobile Subscriber Identifier (IMSI)) stored in the subscriber identification module 196 within a communication network such as the first network 198 or the second network 199. The electronic device 101 may be identified or authenticated.

The wireless communication module 192 may support a 5G network after a 4G network and a next-generation communication technology, for example, NR access technology (new radio access technology). NR access technologies include high-speed transmission of high-capacity data (enhanced mobile broadband (eMBB)), minimization of terminal power and access of multiple terminals (massive machine type communications (mMTC)), or high reliability and low latency (ultra-reliable and low latency (URLLC)). -latency communications)) can be supported. The wireless communication module 192 may support a high frequency band (eg, mmWave band) to achieve a high data rate, for example. The wireless communication module 192 uses various technologies for securing performance in a high frequency band, such as beamforming, massive multiple-input and multiple-output (MIMO), and full-dimensional multiplexing. Technologies such as input/output (FD-MIMO: full dimensional MIMO), array antenna, analog beam-forming, or large scale antenna may be supported. The wireless communication module 192 may support various requirements defined for the electronic device 101, an external electronic device (eg, the electronic device 104), or a network system (eg, the second network 199). According to one embodiment, the wireless communication module 192 may be used to realize peak data rate (eg, 20 Gbps or more) for realizing eMBB, loss coverage (eg, 164 dB or less) for realizing mMTC, or U-plane latency (for realizing URLLC). Example: downlink (DL) and uplink (UL) each of 0.5 ms or less, or round trip 1 ms or less) may be supported.

The antenna module 197 may transmit or receive signals or power to the outside (eg, an external electronic device). According to an embodiment, the antenna module 197 may include an antenna including a radiator formed of a conductor or a conductive pattern formed on a substrate (eg, PCB). According to one embodiment, the antenna module 197 may include a plurality of antennas (eg, an array antenna). In this case, at least one antenna suitable for a communication method used in a communication network such as the first network 198 or the second network 199 is selected from the plurality of antennas by the communication module 190, for example. can be chosen A signal or power may be transmitted or received between the communication module 190 and an external electronic device through the selected at least one antenna. According to some embodiments, other components (eg, a radio frequency integrated circuit (RFIC)) may be additionally formed as a part of the antenna module 197 in addition to the radiator.

According to various embodiments, the antenna module 197 may form a mmWave antenna module. According to one embodiment, the mmWave antenna module includes a printed circuit board, an RFIC disposed on or adjacent to a first surface (eg, a lower surface) of the printed circuit board and capable of supporting a designated high frequency band (eg, mmWave band); and a plurality of antennas (eg, array antennas) disposed on or adjacent to a second surface (eg, a top surface or a side surface) of the printed circuit board and capable of transmitting or receiving signals of the designated high frequency band. can do.

At least some of the components are connected to each other through a communication method between peripheral devices (eg, a bus, general purpose input and output (GPIO), serial peripheral interface (SPI), or mobile industry processor interface (MIPI)) and signal ( e.g. commands or data) can be exchanged with each other.

According to an embodiment, commands or data may be transmitted or received between the electronic device 101 and the external electronic device 104 through the server 108 connected to the second network 199 . Each of the external electronic devices 102 or 104 may be the same as or different from the electronic device 101 . According to an embodiment, all or part of operations executed in the electronic device 101 may be executed in one or more external electronic devices among the external electronic devices 102 , 104 , or 108 . For example, when the electronic device 101 needs to perform a certain function or service automatically or in response to a request from a user or another device, the electronic device 101 instead of executing the function or service by itself. Alternatively or additionally, one or more external electronic devices may be requested to perform the function or at least part of the service. One or more external electronic devices receiving the request may execute at least a part of the requested function or service or an additional function or service related to the request, and deliver the execution result to the electronic device 101 . The electronic device 101 may provide the result as at least part of a response to the request as it is or additionally processed. To this end, for example, cloud computing, distributed computing, mobile edge computing (MEC), or client-server computing technology may be used. The electronic device 101 may provide an ultra-low latency service using, for example, distributed computing or mobile edge computing. In another embodiment, the external electronic device 104 may include an internet of things (IoT) device. Server 108 may be an intelligent server using machine learning and/or neural networks. According to one embodiment, the external electronic device 104 or server 108 may be included in the second network 199 . The electronic device 101 may be applied to intelligent services (eg, smart home, smart city, smart car, or health care) based on 5G communication technology and IoT-related technology.

According to various embodiments, an electronic device (eg, the electronic device 101 of FIG. 1 ) may include various functions. The user can install necessary applications (or functions) on the electronic device 101 and delete unnecessary applications. The number and type of applications installed in the electronic device 101 may vary depending on the user. Applications include applications that operate independently, such as calculators and notepads, but also applications that operate in connection with other electronic devices through a network, such as games and online markets.

According to various embodiments, the operation of an application (or function) executed in the electronic device 101 may be delayed due to various reasons. For example, if an application with delayed operation is connected to a network and communicates with another electronic device, the cause of the delayed operation may be a problem in the communication environment or a problem with the application or the other electronic device (e.g., server). or/and may be due to an inexperienced operation by the user.

According to various embodiments, the electronic device 101 may set network-related variables before connecting to a network using the communication module 190 and may change the set variables according to a network state.

According to various embodiments, variables that can be changed by the electronic device 101 according to a network state include a retransmission timeout (RTO), a congestion window (CWND), a slow start threshold (ssThreshold), and a quick ack. can

According to various embodiments, the retransmission timeout (RTO) may be a waiting time to receive an ack for the data (or data segment) transmitted by the electronic device 101 . The electronic device 101 may operate a timer after transmitting data. The timer may be set to expire on a retransmission timeout (RTO). If the electronic device 101 does not receive an ack until the timer expires, the electronic device 101 may determine that data transmission has failed and transmit the transmitted data again. For example, if the retransmission timeout (RTO) is 1 second, the electronic device 101 may wait up to 1 second to receive an ack. If the electronic device 101 does not receive an ack for 1 second of waiting, it may retransmit the data. Since the retransmission timeout (RTO) is the amount of time the electronic device 101 has to wait to receive an ack, it may be greater than round trip time (RTT). According to an embodiment, the electronic device 101 may retransmit data when the transmitted data is lost before reaching the external electronic device 104 or when an ack transmitted by the external electronic device 104 is not received. . Alternatively, since the electronic device 101 does not know when an ack is received later than the retransmission timeout, the electronic device 101 may retransmit data before the ack arrives. According to an embodiment, if the retransmission timeout (RTO) is large, it may mean that a retransmission timeout has occurred.

According to various embodiments, CWND may be a variable (or value) indicating the amount of data that the electronic device 101 transmits to the external electronic device 104 before receiving an ack. The electronic device 101 may decrease CWND when retransmission occurs frequently, and increase CWND when data transmission succeeds without retransmission. The electronic device 101 may use CWND to avoid network congestion. The amount of data that can be transmitted through the TCP connection may vary depending on the CWND set by the electronic device transmitting the data. Less CWND may mean that less data can be transmitted before receiving an ack.

According to various embodiments, ssThreshold may be an estimate of the working window size of TCP when there is no loss. The ssThreshold may be used to adjust network traffic (or data traffic) by negotiating the amount of data transmitted between the electronic devices 101 and 104 connected through TCP. ssThreshold may be used to determine whether a slow start or congestion avoidance algorithm is used by the electronic device 101 to control data transmission. At the first data transmission, ssThreshold may be set to a high value, and then adjusted. A low ssThreshold can indicate congestion in the network. Also, if retransmission occurs, ssThreshold may be lowered.

According to various embodiments, a combination of CWND and ssThreshold may be referred to as a moving window size.

According to various embodiments, Quick Ack indicates a mode and may be used when starting a TCP connection. In TCP, electronic devices may be connected through an interactive session that transmits an ack when data is received. The electronic device 101 may use the Quick Ack mode to set whether to transmit an ack immediately after receiving data or to transmit it via piggyback afterwards. If the electronic device 101 sets the Quick Ack mode to on (eg, Quick Ack = 1), it can receive data and transmit an ack immediately, and if it sets the Quick Ack mode to off (eg, Quick Ack = 0), the data Even if ack is received, data including ack can be transmitted afterwards without immediately sending ack. Since the electronic device 101 and the external electronic device 104 do not separately transmit and receive Ack, the time required for data transmission/reception (or data delay) can be reduced. The electronic device 101 may set the Quick Ack mode to off and increase CWND in order to transmit a large amount of data. According to an embodiment, the electronic device 101 (eg, the operating system of the electronic device 101) may basically set the Quick Ack mode to on. When the electronic device 101 (eg, an application of the electronic device 101) is connected to a counterpart's electronic device (eg, a server) through a non-interactive session, it may set the Quick Ack mode to off and transmit data.

According to various embodiments, the electronic device 101 may read or set values of variables using an internal interface (eg, a socket stat command).

2 is a graph comparing RTO and RTT according to network connection states of electronic devices.

In Figure 2, RTO and RTT are compared using data of the same size, but RTO is the waiting time for dividing the data to be sent and receiving an ack for the data transmitted at once, and RTT is for the entire data to be sent. It may be the time when an ack was received.

According to various embodiments, an electronic device (eg, the electronic device 101 of FIG. 1 ) transmits data to an external electronic device (eg, the external electronic device 104 of FIG. 1 ) and fails to receive an ack within a certain period of time. You can retransmit the data. Here, the predetermined time is a criterion for determining whether retransmission should be performed, and may be a retransmission timeout (RTO).

According to various embodiments, the retransmission timeout (RTO) may be longer than round trip time (RTT), which is the time the electronic device 101 transmits data and receives an ack. In FIG. 2 , the unit of time representing the retransmission timeout (RTO) is centisecond, and the unit of time representing RTT is millisecond, and the value of the retransmission timeout (RTO) may be a large value.

Referring to FIG. 2 , when the value of the RTT 210 increases, the value of the retransmission timeout (RTO) 220 may also increase. According to various embodiments, the value of the retransmission timeout (RTO) 220 may be less variable when network conditions are good. The electronic device 101 may determine the state of the network using the threshold value of the retransmission timeout (RTO) 220 . For example, if the retransmission timeout is lower than the first threshold Th1 (230), the electronic device 101 may determine that the network state is good and exceed the second threshold (Th2) 240. If high, the state of the network can be determined to be bad. When the retransmission timeout is higher than the first threshold Th1 (230) but lower than the second threshold (Th2) 240, the electronic device 101 may determine that the network state is not good.

According to various embodiments, the electronic device 101 may continue to use the network in use when the retransmission timeout is lower than the first threshold value Th1 230, and when the retransmission timeout is higher than the second threshold value Th2 240. , the state of the network may be determined to be bad, the connected network may be disconnected, and connection to a new network may be attempted. When the retransmission timeout is higher than the first threshold Th1 (230) but lower than the second threshold (Th2) 240, the electronic device 101 sets the retransmission timeout to the second threshold (Th2) 240. , or you can try connecting to a new network right away.

3A and 3B are flowcharts for determining the cause of delay by the electronic device according to the first embodiment.

According to various embodiments, the electronic device (eg, the electronic device 101 of FIG. 1 ), in operation 305, has a retransmission timeout (RTO) less than a first threshold value Th1 (eg, 230 of FIG. 2 ). can judge whether

According to various embodiments, in operation 330, the electronic device 101 may determine whether the electronic device 101 is in the quick ack mode when the retransmission timeout (RTO) is less than the first threshold value Th1. If the retransmission timeout (RTO) is less than the first threshold value Th1, the electronic device 101 may determine that retransmission does not occur or that retransmitted data is successfully transmitted within a predetermined time.

According to various embodiments, in operation 335, the electronic device 101 may determine that the network state is good if the electronic device 101 is in a quick ack mode (quick ack = 1). If the retransmission timeout (RTO) is less than the first threshold value (Th1) and the quick ack mode (quick ack = 1), the electronic device 101 determines that the network is in a good state and is set to transmit a large amount of data. can

According to various embodiments, in operation 340, if the electronic device 101 is not in the quick ack mode (quick ack = 0), it may check whether the value of CWND or/and ssThreshold is smaller than the third threshold Th3.

According to various embodiments, in operation 345, if the values of CWND and/or ssThreshold are smaller than the third threshold Th3, the electronic device 101 may determine that the problem is in the application and/or server. A threshold corresponding to CWND and a threshold corresponding to ssThreshold may be different.

According to various embodiments, in operation 350, the electronic device 101 may display a notification to the user. For example, the electronic device 101 may display a message “There is no response from the server” or “Please run the application again”. The electronic device 101 may terminate or restart the application by receiving a user's input. The electronic device 101 can connect again using a previously connected network.

According to various embodiments, in operation 355, if the value of CWND or/and ssThreshold is greater than the third threshold Th3, the electronic device 101 may determine that the network state is good. If the value of CWND is large, it may mean that there is a large amount of data that the electronic device 101 can transmit at one time, so the electronic device 101 can determine that the network state is good.

According to various embodiments, in operation 310, the electronic device 101 may determine whether the retransmission timeout (RTO) is smaller than the second threshold value Th2. The second threshold value Th2 (eg, 240 of FIG. 2 ) may be greater than the first threshold value Th1 .

According to various embodiments, in operation 315, the electronic device 101 may determine that the network state is not good when the retransmission timeout (RTO) is less than the second threshold value Th2.

According to various embodiments, in operation 320, the electronic device 101 may measure the quality of the connected network. For example, if the connected network is Wi-Fi, the electronic device 101 may measure the quality of the network based on the ICMP response time of the Wi-Fi AP. As another example, the electronic device 101 may measure the quality of the network based on the response time of a frequently used server.

According to various embodiments, in operation 325, the electronic device 101 may determine whether the quality of the network measured in the previous operation is lower than a preset criterion.

According to various embodiments, if the measured quality of the network is not lower than a preset criterion, the electronic device 101 may determine whether a fast connection is requested in operation 330. If it is determined that the network speed is slow, but the quality of the network is not low, the electronic device 101 may determine whether the user's preference requests a fast connection.

According to various embodiments, when the retransmission timeout (RTO) is greater than the second threshold value Th2, the electronic device 101 may determine that the network state is bad in operation 335.

According to various embodiments, the electronic device 101 may perform operation 335 when it is determined that the user's preference is to request quick connection.

According to various embodiments, in operation 340, the electronic device 101 may use another network because the state of the network is poor or bad.

According to various embodiments, the electronic device 101 may perform operation 340 even if the user's preference does not request quick connection. The electronic device 101 may perform operation 340 when the measured quality of the network is lower than the set standard.

3A and 3B, the electronic device 101 distinguishes a retransmission timeout (RTO) into a first threshold and a third threshold to determine the state of the network, but uses one threshold to determine the state of the network. can judge For example, the electronic device 101 may determine that the network state is good if the retransmission timeout (RTO) is less than the threshold value, and the network state is not good if the retransmission timeout (RTO) is greater than the threshold value. can be judged to be

4 illustrates an example in which a user moves and uses an electronic device.

Referring to FIG. 4 , a user 410 may play a game or use an internet browser using an electronic device (eg, the electronic device 101 of FIG. 1 ). The electronic device 101 may be connected to an external electronic device (eg, the external electronic device 104 or the server 102 of FIG. 1 ) using Wi-Fi. The user 410 can use the electronic device 101 while on the move.

According to various embodiments, as shown in (a) of FIG. 4 , the user 410 may move from an area 420 with good Wi-Fi connection strength to an area 430 with poor Wi-Fi connection strength. As a result, a delay may occur in an application being executed in the electronic device 101 .

According to various embodiments, the user 410 may set available networks for each application. For example, the user 410 may configure a network for each application in consideration of a current fee. The user 410 determines that a real-time response is required in the case of a game, and may set another network to be used if the network condition is poor. As another example, the user 410 may configure a network in consideration of characteristics of an application. The user 410 may configure other networks to be used if the characteristics of the application require high-reliability and ultra-low-latency communication and the network condition is poor.

Referring to (b) of FIG. 4 , in the case of a game, another network may be used if the network condition is poor, and in the case of an Internet browser, the network may not be changed even if the network condition is not good.

5 illustrates changes in variables depending on whether a delay occurs in an electronic device according to a first embodiment.

Referring to (a) of FIG. 5 , an electronic device (eg, the electronic device 101 of FIG. 1 ) may be in a state in which two sockets are created in T ₀ . The interface 510 of the first socket is Wi-Fi, the TCP state 515 is connection established, the Innode 520 is Inn1, the retransmission timeout (RTO) 525 is c1, and the Quick Ack 530 is 0, cwnd (535) may be 1, and ssThreshold (540) may be 5. The interface 510 of the second socket is Wi-Fi, the TCP state 515 is connection established, the Innode 520 is Inn2, the retransmission timeout (RTO) 525 is c2, and the Quick Ack 530 is 0, cwnd (535) may be 1, and ssThreshold (540) may be 5. If the Quick Ack 530 is 0, the quick ack mode may be off, and if the quick ack 530 is 1, the quick ack mode may be set to an on state. Variables in the first and second sockets in T ₁ can have the same values (or states) as in T ₀ .

5 (b) and (c) show variables of the first socket and the second socket depending on whether the delay is resolved at T ₂ .

Referring to (b) of FIG. 5 , variables of the first socket and the second socket may have the same value (or state) even in T ₂ . The electronic device 101 may determine that the delay occurs because variables of the first socket and the second socket are the same in T ₁ and T ₂ .

Referring to (c) of FIG. 5 , since the value of only Quick Ack 545 among the variables of the first socket and the second socket is changed in T ₂ , the electronic device 101 may determine that the problem is not a network problem. At T ₂ , Quick Ack 545 may be changed to 1. When the Quick Ack 545 is changed to 1, the Quick Ack mode may be turned on. For example, the electronic device 101 may set the quick ack mode to on when wanting to check a quick ack.

6 is a flowchart for determining a cause of a delay by an electronic device according to a second embodiment.

According to various embodiments, the electronic device (eg, the electronic device 101 of FIG. 1 ) may, in operation 610 , determine whether the status of the socket is SYN. The electronic device 101 may transmit a SYN message to establish a TCP connection with an external electronic device (eg, the external electronic device 104 of FIG. 1 ) using a socket. If the socket state is not SYN, the electronic device 101 may be in a state where it does not want a TCP connection with the external electronic device 104 .

According to various embodiments, in operation 620, if the state of the socket is SYN, the electronic device 101 may check whether the retransmission timeout (RTO) of the socket is greater than a threshold value.

According to various embodiments, in operation 630, the electronic device 101 may extract the IP address and port number of the socket when a retransmission timeout (RTO) of the socket is greater than a threshold value. When the retransmission timeout (RTO) of the socket is smaller than the threshold value, the electronic device 101 determines that retransmission has not occurred and determines that there is no problem.

According to various embodiments, in operation 640, the electronic device 101 may determine whether a socket can be created using another network (eg, LTE, 5G) using the extracted IP address and port number of the socket.

According to various embodiments, in operation 650, the electronic device 101 may use another network if another socket can be created.

According to various embodiments, in operation 660, the electronic device 101 may determine that it is not a network problem if it is not possible to create another socket.

7 illustrates changes in variables depending on whether a delay occurs in an electronic device according to a second embodiment.

Referring to (a) of FIG. 7 , an electronic device (eg, the electronic device 101 of FIG. 1 ) may be in a state in which two sockets are created in T ₀ . Interface 705 of the first socket is Wi-Fi, IP address 710 is xxxx1, port number 715 is yyy1, TCP status 720 is attempting to connect (SYN), retransmission timeout (RTO) (725) may be c1. The second socket's interface (705) is Wi-Fi, IP address (710) is xxxx2, port number (715) is yyy2, TCP status (720) is attempting to connect (SYN), retransmission timeout (RTO) (725) may be c2.

According to various embodiments, the retransmission timeout (RTO) 730 of the first socket and the second socket at T ₁ may be changed to c3 and c4. A retransmission timeout (RTO) 730 may be changed when a retransmission occurs.

7(b) and (c) show variables of the first socket and the second socket depending on whether the delay is resolved at T ₂ .

Referring to (b) of FIG. 7 , in T ₂ , the electronic device 101 may attempt to connect using another network, LTE, using the IP addresses and port numbers of the first socket and the second socket (740). Referring to the TCP state 745 of the first socket, the electronic device 101 may be in a state in which a connection to the LTE network is established. When the connection is established by changing the network, the electronic device 101 may determine that there is a problem with the network.

Referring to (c) of FIG. 7 , at T ₂ , the electronic device 101 may attempt connection using another network, LTE, using the IP addresses and port numbers of the first socket and the second socket. However, the TCP state of the first socket and the second socket may still be in the state of trying to connect (SYN). The electronic device 101 may determine that there is no problem with the network if the connection is not established even though the network has been changed.

8 is a flowchart for determining a cause of a delay by an electronic device according to a third embodiment.

According to various embodiments, the electronic device (eg, the electronic device 101 of FIG. 1 ), in operation 810 , may determine whether the number of data retransmissions of the socket is greater than the threshold value Th1. According to one embodiment, the threshold value Th1 may be zero.

According to various embodiments, in operation 820, the electronic device 101 may check the retransmission timeout (RTO) when the number of data retransmissions of the socket is greater than the threshold value Th1.

According to various embodiments, in operation 830, the electronic device 101 determines whether the checked retransmission timeout (RTO) is greater than the previously checked retransmission timeout or/and whether the checked retransmission timeout (RTO) is greater than the threshold value Th2. can judge

According to various embodiments, in operation 840, the electronic device 101 determines that the checked retransmission timeout (RTO) is greater than the previously checked retransmission timeout or/and the checked retransmission timeout (RTO) is greater than the threshold value Th2. If it is large, it can be determined that the state of the network is not good.

According to various embodiments, in operation 850, the electronic device 101 may change a connected network to another network. For example, if the currently connected network is Wi-Fi, the electronic device 101 may disconnect the Wi-Fi and attempt to connect to LTE. Although described here as an electronic device, it can be performed by a network socket. A network socket may be created by an application running in an electronic device, and one application may create a plurality of network sockets.

According to various embodiments, in operation 860, the electronic device 101 may determine that there is no problem in the network if the checked retransmission timeout (RTO) is equal to or smaller than the previously checked retransmission timeout. Alternatively, the electronic device 101 may determine that there is no problem in the network when the checked retransmission timeout (RTO) is less than or equal to the threshold value Th2.

9 illustrates changes in variables depending on whether a delay occurs in an electronic device according to a third embodiment.

Referring to (a) of FIG. 9 , an electronic device (eg, the electronic device 101 of FIG. 1 ) may be in a state in which two sockets are created in T ₀ . Interface (905) of the first socket is Wi-Fi, IP address (910) is xxxx1, port number (915) is yyy1, TCP status (920) is connection established, Innode (925) is Inn1, retransmission time The out (RTO) 930 may be c1 and the timer 935 may be t1. Interface (905) of the second socket is Wi-Fi, IP address (910) is xxxx2, port number (915) is yyy2, TCP status (920) is connection established, Innode (925) is Inn2, retransmission time Out (RTO) 930 may be c2, and timer 935 may be 0. Here, the timer 935 is set when the electronic device 101 does not receive an ack from the electronic device that has received the transmitted data (eg, the external electronic device 104) and the data needs to be retransmitted, and data transmission is performed. If not successful, the value of timer 935 may be incremented. In the first socket, retransmission occurs and the timer 935 is set to t1, and in the second socket, retransmission does not occur and the timer 935 is set to 0.

Referring to (a) of FIG. 9, retransmission does not occur in the second socket in T ₁ and the set value is not changed, but retransmission timeout continues to occur in the first socket, so that the retransmission timeout (RTO) 940 c3 and the timer 945 may be changed to t2. According to various embodiments, c3 may be a value greater than c1, and t2 may be a value greater than t1. According to various embodiments, the first socket may be a socket supporting a game, so that a user interface indicating a delay may be displayed on the game as shown in FIG. 9(a).

9 (b) and (c) show variables of the first socket and the second socket depending on whether the delay is resolved at T ₂ .

Referring to (b) of FIG. 9 , it may indicate that a retransmission timeout still occurs in the first socket. In the first socket, the value of the retransmission timeout (RTO) 950 can be changed to c4 and the timer 955 can be changed to t3. The electronic device 101 may determine that there is a problem with the Wi-Fi connection and change the connection to LTE.

Referring to (b) of FIG. 9 , it may indicate that a retransmission timeout still occurs in the first socket. In the first socket, the value of the retransmission timeout (RTO) 950 can be changed to c4 and the timer 955 can be changed to t3. The electronic device 101 may determine that there is a problem with the Wi-Fi connection and change the connection to LTE.

Referring to (c) of FIG. 9, retransmission may succeed in the first socket. In the first socket, the value of the retransmission timeout (RTO) 960 can be changed to c3 and the timer 965 can be changed to 0. The electronic device 101 determines that there is no problem with the Wi-Fi connection and continues to maintain the Wi-Fi connection.

In the above, the operation is described as being performed by an electronic device, but may be an operation performed by a network socket. A network socket may be created by an application running in an electronic device, and one application may create a plurality of network sockets.

An electronic device according to various embodiments of the present disclosure includes at least one communication module supporting connection to a plurality of networks including a first network and a second network, and a processor operatively connected to the at least one communication module. The processor checks a retransmission timeout through the first network, checks whether the checked retransmission timeout is greater than a first threshold, and if the checked retransmission timeout is greater than the first threshold, the second A connection may be changed from the first network to the second network.

The processor of the electronic device according to various embodiments of the present disclosure may create a network socket and connect to the first network using the created network socket.

In an electronic device according to various embodiments of the present disclosure, the network socket may be created by an application.

The processor of the electronic device according to various embodiments of the present disclosure, if the checked retransmission timeout is less than the first threshold value, determines whether it is in Quick Ack mode, and if it is determined that it is not in Quick Ack mode, CWND It is checked whether the CWND is less than the second threshold, and if the CWND is less than the second threshold, a notification notifying that a problem has occurred in the running function may be displayed.

In an electronic device according to various embodiments of the present disclosure, the second threshold may be a previously identified CWND.

The processor of the electronic device according to various embodiments of the present disclosure, if the checked retransmission timeout is less than the first threshold value, determines whether it is in Quick Ack mode, and if it is determined that it is not in Quick Ack mode, ssThreshold is set to It is checked whether the ssThreshold is less than the third threshold, and if the ssThreshold is less than the third threshold, a notification notifying that a problem has occurred in the running function may be displayed.

In an electronic device according to various embodiments of the present disclosure, the third threshold may be a previously checked ssThreshold.

The processor of the electronic device according to various embodiments of the present disclosure waits for a predetermined time before changing the connection from the first network to the second network, and after waiting for the predetermined time, checks whether the electronic device is in Quick Ack mode, If not in the Quick Ack mode, a connection may be changed from the first network to the second network.

The processor of the electronic device according to various embodiments of the present disclosure extracts the IP address and port number of the socket for which the retransmission timeout has been confirmed, and connects to the second network using the extracted IP address and port number of the socket. It is checked if it is possible, and if it fails to connect to the second network, a notification indicating that a network problem has occurred may be displayed.

The processor of the electronic device according to various embodiments of the present disclosure extracts the IP address and port number of the socket for which the retransmission timeout has been confirmed, and connects to the second network using the extracted IP address and port number of the socket. It checks whether it is possible, and if it fails to connect to the second network, it may try to connect to the third network.

The processor of the electronic device according to various embodiments of the present disclosure, before changing the connection from the first network to the second network, checks the number of retransmissions of the socket for which the retransmission timeout has been confirmed, and determines that the checked number of retransmissions is It is checked whether the number of retransmissions is greater than a fourth threshold, and if the checked number of retransmissions is greater than the fourth threshold, a next attempt timer value is checked, and if the checked next attempt timer value is greater than a fifth threshold, the first network It is possible to change the connection to the second network at .

In an electronic device according to various embodiments of the present disclosure, the fifth threshold value may be a value of a next attempt timer previously checked.

An operating method of an electronic device according to various embodiments of the present disclosure includes an operation of checking a retransmission timeout through a first network, an operation of determining whether the checked retransmission timeout is greater than a first threshold value, and an operation of checking whether the checked retransmission timeout is If it is greater than the first threshold, an operation of changing the connection from the first network to the second network may be included.

An operating method of an electronic device according to various embodiments of the present disclosure may further include generating a network socket and connecting to the first network using the created network socket.

In the operating method of an electronic device according to various embodiments of the present disclosure, the network socket may be created by an application.

An operating method of an electronic device according to various embodiments of the present disclosure includes an operation of determining whether the electronic device is in the Quick Ack mode if the checked retransmission timeout is less than the first threshold value, and if it is determined that the electronic device is not in the Quick Ack mode, CWND The method may further include checking whether the CWND is less than a threshold value of 2, and displaying a notification notifying that a problem has occurred in an executing function if the CWND value is less than the second threshold value.

In the operating method of an electronic device according to various embodiments of the present disclosure, the second threshold value may be a previously checked CWND.

An operating method of an electronic device according to various embodiments of the present disclosure includes, if the checked retransmission timeout is less than the first threshold value, determining whether the electronic device is in the Quick Ack mode; The method may further include checking whether the ssThreshold is less than the third threshold, and displaying a notification notifying that a problem has occurred in the running function if the ssThreshold is less than the third threshold.

In the operating method of an electronic device according to various embodiments of the present disclosure, the third threshold may be a previously checked ssThreshold.

In the operating method of an electronic device according to various embodiments of the present disclosure, the operation of changing the connection from the first network to the second network includes an operation of waiting for a predetermined time period, and an operation of checking whether the electronic device is in the Quick Ack mode after waiting for the predetermined period of time. , and, if not in the Quick Ack mode, an operation of changing a connection from the first network to the second network.

Electronic devices according to various embodiments disclosed in this document may be devices of various types. The electronic device may include, for example, a portable communication device (eg, a smart phone), a computer device, a portable multimedia device, a portable medical device, a camera, a wearable device, or a home appliance. An electronic device according to an embodiment of the present document is not limited to the aforementioned devices.

Various embodiments of this document and terms used therein are not intended to limit the technical features described in this document to specific embodiments, but should be understood to include various modifications, equivalents, or substitutes of the embodiments. In connection with the description of the drawings, like reference numerals may be used for like or related elements. The singular form of a noun corresponding to an item may include one item or a plurality of items, unless the relevant context clearly dictates otherwise. In this document, "A or B", "at least one of A and B", "at least one of A or B", "A, B or C", "at least one of A, B and C", and "A Each of the phrases such as "at least one of , B, or C" may include any one of the items listed together in that phrase, or all possible combinations thereof. Terms such as "first", "second", or "first" or "secondary" may simply be used to distinguish a given component from other corresponding components, and may be used to refer to a given component in another aspect (eg, importance or order) is not limited. A (e.g., first) component is said to be "coupled" or "connected" to another (e.g., second) component, with or without the terms "functionally" or "communicatively." When mentioned, it means that the certain component may be connected to the other component directly (eg by wire), wirelessly, or through a third component.

The term "module" used in various embodiments of this document may include a unit implemented in hardware, software, or firmware, and is interchangeable with terms such as, for example, logic, logical blocks, parts, or circuits. can be used as A module may be an integrally constructed component or a minimal unit of components or a portion thereof that performs one or more functions. For example, according to one embodiment, the module may be implemented in the form of an application-specific integrated circuit (ASIC).

Various embodiments of this document provide one or more instructions stored in a storage medium (eg, internal memory 136 or external memory 138) readable by a machine (eg, electronic device 101). It may be implemented as software (eg, the program 140) including them. For example, a processor (eg, the processor 120 ) of a device (eg, the electronic device 101 ) may call at least one command among one or more instructions stored from a storage medium and execute it. This enables the device to be operated to perform at least one function according to the at least one command invoked. The one or more instructions may include code generated by a compiler or code executable by an interpreter. The device-readable storage medium may be provided in the form of a non-transitory storage medium. Here, 'non-temporary' only means that the storage medium is a tangible device and does not contain a signal (e.g. electromagnetic wave), and this term refers to the case where data is stored semi-permanently in the storage medium. It does not discriminate when it is temporarily stored.

According to one embodiment, the method according to various embodiments disclosed in this document may be provided by being included in a computer program product. Computer program products may be traded between sellers and buyers as commodities. A computer program product is distributed in the form of a device-readable storage medium (e.g. compact disc read only memory (CD-ROM)), or through an application store (e.g. Play Store ^TM ) or on two user devices (e.g. It can be distributed (eg downloaded or uploaded) online, directly between smart phones. In the case of online distribution, at least part of the computer program product may be temporarily stored or temporarily created in a storage medium readable by a device such as a manufacturer's server, an application store server, or a relay server's memory.

According to various embodiments, each component (eg, module or program) of the above-described components may include a single object or a plurality of entities, and some of the plurality of entities may be separately disposed in other components. there is. According to various embodiments, one or more components or operations among the aforementioned corresponding components may be omitted, or one or more other components or operations may be added. Alternatively or additionally, a plurality of components (eg modules or programs) may be integrated into a single component. In this case, the integrated component may perform one or more functions of each of the plurality of components identically or similarly to those performed by a corresponding component of the plurality of components prior to the integration. . According to various embodiments, the actions performed by a module, program, or other component are executed sequentially, in parallel, iteratively, or heuristically, or one or more of the actions are executed in a different order, or omitted. or one or more other actions may be added.

Claims (20)

In electronic devices,
at least one communication module supporting connection with a plurality of networks including a first network and a second network; and
a processor operatively connected with the at least one communication module;
the processor,
Checking a retransmission timeout through the first network;
Check whether the checked retransmission timeout is greater than a first threshold;
and changing the connection from the first network to the second network when the checked retransmission timeout is greater than the first threshold. The method of claim 1, wherein the processor,
create a network socket,
An electronic device connected to the first network using the generated network socket. According to claim 2,
The network socket is created by an application, electronic device. The method of claim 1, wherein the processor,
If the checked retransmission timeout is less than the first threshold, it is determined whether the mode is in Quick Ack mode;
If it is determined that the Quick Ack mode is not in the Quick Ack mode, it is determined whether CWND is less than a second threshold value;
If the CWND is less than the second threshold, displaying a notification notifying that a problem has occurred in a running function. According to claim 4,
The second threshold is the previously identified CWND, the electronic device. The method of claim 1, wherein the processor,
If the checked retransmission timeout is less than the first threshold, it is determined whether the mode is in Quick Ack mode;
If it is determined that the Quick Ack mode is not in the Quick Ack mode, check whether ssThreshold is smaller than a third threshold value;
If the ssThreshold is less than the third threshold, display a notification notifying that a problem has occurred in the function being executed. According to claim 6,
The third threshold is the previously identified ssThreshold, the electronic device. The method of claim 1, wherein the processor,
Waiting for a certain period of time before changing the connection from the first network to the second network;
After waiting for the predetermined time, check whether it is in Quick Ack mode,
If not in the Quick Ack mode, changing the connection from the first network to the second network. The method of claim 1, wherein the processor,
Extract the IP address and port number of the socket for which the retransmission timeout has been confirmed;
Check whether it is possible to connect to the second network using the IP address and port number of the extracted socket;
If the connection to the second network fails, displaying a notification indicating that a problem has occurred in the network. The method of claim 1, wherein the processor,
Extract the IP address and port number of the socket for which the retransmission timeout has been confirmed;
Check whether it is possible to connect to the second network using the IP address and port number of the extracted socket;
The electronic device that attempts to connect to a third network when failing to connect to the second network. The method of claim 1, wherein the processor,
Before changing the connection from the first network to the second network, checking the number of retransmissions of the socket for which the retransmission timeout has been confirmed;
Check whether the checked number of retransmissions is greater than a fourth threshold;
If the checked number of retransmissions is greater than the fourth threshold, a value of a next attempt timer is checked;
and changing the connection from the first network to the second network when the value of the next attempt timer is greater than a fifth threshold. According to claim 10,
The fifth threshold is a value of a previously checked next attempt timer. In the operating method of the electronic device,
Checking a retransmission timeout through the first network;
checking whether the checked retransmission timeout is greater than a first threshold value; and
and changing a connection from the first network to a second network when the checked retransmission timeout is greater than the first threshold. According to claim 13,
creating a network socket; and
The method of operating the electronic device further comprising an operation of connecting to the first network using the generated network socket. According to claim 14,
The network socket is created by an application, the operating method of the electronic device. According to claim 13,
if the checked retransmission timeout is less than the first threshold, checking whether the mode is in a quick ack mode;
if it is determined that the Quick Ack mode is not in the Quick Ack mode, checking whether CWND is smaller than a second threshold; and
If the CWND is less than the second threshold, displaying a notification notifying that a problem has occurred in a running function is further included. According to claim 16,
The second threshold value is the previously identified CWND, the operating method of the electronic device. According to claim 13,
if the checked retransmission timeout is less than the first threshold, checking whether the mode is in a quick ack mode;
checking whether ssThreshold is less than a third threshold when it is determined that the Quick Ack mode is not; and
and if the ssThreshold is less than the third threshold, displaying a notification notifying that a problem has occurred in an executing function. According to claim 18,
The third threshold is ssThreshold previously identified. The method of claim 13, wherein changing the connection from the first network to the second network comprises:
Waiting for a certain amount of time;
After waiting for the predetermined time, checking whether it is in the Quick Ack mode; and
If it is not the Quick Ack mode, the operation of changing the connection from the first network to the second network.

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