KR101544034B1 - method and apparatus for multi-party call and recording medium thereof - Google Patents

Abstract

The present invention relates to a technique for smooth communication between terminals in consideration of a network state when a call connection between a plurality of terminals is taken into consideration. In a transmitting terminal, packets of a bit rate set according to a calling method are transmitted to a plurality of receiving terminals, Thereby improving communication quality between a plurality of terminals.

Description

[0001] The present invention relates to a communication method, apparatus, and recording medium for terminals for multi-

The present invention relates to a method and apparatus for connecting a call between a plurality of terminals for a multi-party call.

With the development of mobile communication technology and the increase of penetration rate of mobile terminals, the existing communication culture is changing. The portable terminal can provide not only its own voice call service but also various data transfer services and various additional services, so that various call methods different from existing call methods are being developed. A typical example is a multi-party call.

The multi-party call refers to a call made by a plurality of terminal users together. In the case of a multi-party call, a plurality of users can simultaneously make a call, thereby improving the efficiency of the call. However, in the case of performing a plurality of calls, the amount of data to be transmitted and received increases as the number of users participating in the call increases, which makes it difficult to smoothly communicate with users.

The present invention relates to a method, an apparatus, and a recording medium for determining a call connection between users in consideration of a network state so that a smooth call can be made between users in a multi-user call connection.

According to an embodiment of the present invention, there is provided a communication method between a plurality of terminals, the method comprising: transmitting packets having a preset bit rate to each of a plurality of receiving terminals in a transmitting terminal; Receiving, from each of the receiving terminals, a feedback packet including information on an arrival delay time of the packets; And determining whether a call connection is made with a receiving terminal that has transmitted the feedback packet based on the time information included in the received feedback packet.

According to another embodiment of the present invention, there is provided a communication method between a plurality of terminals, comprising: receiving, at a receiving terminal, packets of a predetermined bit rate transmitted from a transmitting terminal to each of a plurality of receiving terminals including the receiving terminal; Measuring the arrival delay time of the packets by the receiving terminal; And transmitting the feedback packet including the information on the arrival delay time to the transmitting terminal, wherein the transmitting terminal transmits the feedback packet to the receiving terminal that has transmitted the feedback packet based on the time information included in the received feedback packet, And determines whether or not the call connection is established.

According to another aspect of the present invention, there is provided a transmitting terminal for connecting a call between a plurality of terminals, the transmitting terminal comprising: a transmitting unit for transmitting packets of a predetermined bit rate to each of a plurality of receiving terminals in a transmitting terminal; A receiving unit for receiving, from each of the receiving terminals, a feedback packet including information on an arrival delay time of the packets; And a determination unit determining whether a call connection is made with a receiving terminal that has transmitted the feedback packet based on the time information included in the received feedback packet.

According to another embodiment of the present invention, there is provided a receiving device for connecting a call between a plurality of terminals, the receiving device comprising: a transmitting terminal for receiving packets of a predetermined bit rate transmitted from the receiving terminal to each of a plurality of receiving terminals including the receiving terminal ; A measuring unit for measuring arrival delay time of the packets by the receiving terminal; And a transmitting unit for transmitting a feedback packet including information on the arrival delay time to the transmitting terminal, wherein the transmitting terminal comprises: a receiving terminal that transmits the feedback packet based on the time information included in the received feedback packet; And determines whether or not the call connection is established.

FIG. 1 is a block diagram of a multi-party call connection according to an embodiment of the present invention.
FIG. 3 is a flowchart illustrating a call connection procedure between a terminal and a receiving terminal. FIG.
2 is a block diagram illustrating a transmitting terminal that performs call connection between a plurality of terminals according to an embodiment of the present invention
3 is a block diagram illustrating a receiving terminal that performs call connection between a plurality of terminals according to an embodiment of the present invention.
FIG. 4A is a diagram illustrating a packet of a predetermined bit rate according to an embodiment of the present invention.
4B is a diagram illustrating a feedback packet according to an embodiment of the present invention.
FIG. 5 is a graph illustrating a method of transmitting packets with a bit rate set according to a call method according to an embodiment of the present invention, with respect to time axis.
6 is a flowchart illustrating a method of connecting a call with a plurality of terminals in a transmitting terminal according to an exemplary embodiment of the present invention.
7 is a flowchart illustrating a method of connecting a call with a plurality of terminals in a receiving terminal according to an embodiment of the present invention.
8 is a flowchart illustrating a process for determining whether a voice call connection is established between a plurality of terminals according to an exemplary embodiment of the present invention.
9 is a flowchart illustrating a process for determining whether a voice call and a video call are connected between a plurality of terminals according to an embodiment of the present invention.
10 is a flowchart illustrating a method of connecting a voice call when an existing call connection exists between a plurality of terminals according to an embodiment of the present invention.
11 is a flowchart illustrating a method for connecting a voice call and a video call when an existing call connection exists between a plurality of terminals according to an exemplary embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. The following examples of the present invention are intended only to illustrate the present invention and do not limit or limit the scope of the present invention. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

FIG. 1 is a block diagram of a multi-party call connection according to an embodiment of the present invention.

FIG. 3 is a flowchart illustrating a call connection procedure between a terminal and a receiving terminal. FIG.

Referring to FIG. 1, the network status between the transmitting terminal 102 and the receiving terminal 104 can be determined in order to determine whether the transmitting terminal 102 and the receiving terminal 104 have a call connection. The receiving terminal 104 of FIG. 1 is an example of one of a plurality of receiving terminals.

In step 110, the transmitting terminal 102 may transmit packets of a predetermined bit rate to the receiving terminal 104. [ Here, packets of a predetermined bit rate can be used to predict the state of a network when a call is performed between terminals of a plurality of users.

Specifically, the bit rate of packets transmitted from the transmitting terminal 102 to the receiving terminal 104 according to an exemplary embodiment of the present invention may be determined by considering a bit rate required according to a calling method when a plurality of terminals communicate with each other Respectively. The bit rate of the packets may be variously set according to the type of the call connection method. The call connection method may include at least one of a voice call and a video call.

On the other hand, the bit rate of the packets may be affected by the number of users participating in the multi-party call connection. For example, when N calls are performed and 2N calls are performed, the required bit rate is higher for 2N callers. Therefore, when the transmission period in the transmitting terminal 102 is the same, the size of the packets transmitted in the 2N multi-user call connection can be set to be larger than the size of the packets transmitted in the N multi-user connection. According to an embodiment of the present invention, when conducting a multi-party call, the transmitting terminal may analyze the number of users and set the size of the packets considering the bit rate according to the number of users.

According to an embodiment of the present invention, the transmitting terminal 102 may transmit packets having a bit rate set in a plurality of receiving terminals including the receiving terminal 104 for a multi-party call connection.

In step 115, the receiving terminal 104 may measure the arrival delay time of packets received from the transmitting terminal 102. Here, the information on the arrival delay time of the packets may include a difference in time of receiving each packet with respect to the transmission period of the packets. For example, the information on the arrival delay time may be determined as a sum of the difference between the interval of receiving each packet and the interval of transmitting packets for the packets transmitted by the transmitting terminal 102. Each receiving terminal can measure the arrival delay time of packets received from the transmitting terminal 102. [

In step 120, the receiving terminal 104 transmits a feedback packet including information on the arrival delay time of the packets measured in step 115 to the transmitting terminal 102.

In step 125, it is possible to determine whether or not the call connection is made using the information on the arrival delay time of the packets included in the feedback packet received in step 120. It can be predicted that the network state between the transmitting terminal 102 and the receiving terminal 104 is congested when the arrival time of the packets measured by the receiving terminal 104 is delayed from the expected arrival time according to the embodiment of the present invention have. Specifically, if the receiving terminal 104 sets a predetermined threshold value and the arrival delay time for the packets exceeds the threshold value, it can be predicted that the network state is congested.

Step 130 is a case where the arrival delay time measured by the receiving terminal 104 exceeds the threshold value, and the transmitting terminal 102 can terminate the call connection attempt with the receiving terminal 104. [

Step 135 may transmit a call termination signal to the receiving terminal 104 in accordance with the call connection attempt termination decision in step 130.

Step 140 is a case in which the arrival delay time measured by the receiving terminal 104 is less than or equal to the threshold value, and may attempt to establish a call connection with the receiving terminal 104.

Step 145 may transmit a call connection signal to the receiving terminal 104 according to the call connection decision in step 140. [

According to an embodiment of the present invention, packets of a bit rate set in the transmitting terminal 102 are transmitted to a plurality of receiving terminals participating in a multi-party call, It is possible to determine whether or not the call connection with each receiving terminal is established.

2 is a block diagram illustrating a transmitting terminal that performs call connection between a plurality of terminals according to an embodiment of the present invention.

Referring to FIG. 2, a transmitting terminal 200 according to an embodiment of the present invention may include a transmitting unit 210, a receiving unit 220, and a determining unit 230. The transmitting terminal 200 of FIG. 2 performs the same function as the transmitting terminal 102 of FIG. 1 according to an embodiment of the present invention.

Only the components related to the present embodiment are shown in the terminal control device 200 shown in Fig. Accordingly, it will be understood by those skilled in the art that other general-purpose components other than the components shown in FIG. 2 may be further included.

The transmitting unit 210 may transmit packets of a predetermined bit rate to each of a plurality of receiving terminals. Here, the bit rate of packets to be transmitted may be set in consideration of a bit rate required according to a communication method when a plurality of terminals communicate with each other.

According to an embodiment of the present invention, a call method between a plurality of terminals may include at least one of a video call and a voice call. The bit rate set according to the type of the communication method can be changed. According to an embodiment of the present invention, when transmitting packets having a bit rate set to a plurality of receiving terminals from the transmitting terminal 200, packets having a low bit rate value can be transmitted first.

For example, a video call requires a higher bit rate than a voice call. In case of voice call, it is also possible to distinguish between a case where a wideband voice codec is used according to a codec (hereinafter referred to as WB voice call) and a case where a narrowband voice codec is used (hereinafter referred to as NB voice call) Rate is higher than the bit rate required in the case of the NB voice call. Therefore, according to an embodiment of the present invention, the transmitting terminal 200 can transmit packets considering a required bit rate when a NB voice call is preferentially performed to a plurality of receiving terminals.

If the arrival delay time of packets is below the threshold value, it can be predicted that the NB voice call can be performed. That is, according to an embodiment of the present invention, when the sum of the difference between the time interval in which the receiving terminal receives the packets of the bit rate set according to the NB voice call and the interval in which the packets are transmitted in the transmitting terminal 200 is less than the threshold value, Voice calls are possible. In this case, the transmitting terminal 200 can transmit packets having a bit rate set based on a WB voice call requesting a bit rate higher than the NB voice call to a plurality of receiving terminals.

According to an embodiment of the present invention, when it is predicted that a voice call can be smoothly performed as a result of transmitting packets having a bit rate set based on a WB voice call, a bit set based on a video call requiring a higher bit rate Rate < / RTI > packets. It is possible to determine whether or not the call can be smoothly performed in the same manner as in the case of the NB voice call in the case of the WB voice call and the video call.

According to an embodiment of the present invention, a method of transmitting packets with a predetermined bit rate to a plurality of receiving terminals can be transmitted with a time interval for each bit rate. Specifically, when the preset bit rates of the packets are various types, the transmitting terminal 200 can transmit packets of the first bit rate to each of the plurality of receiving terminals. The transmitting terminal 200 may transmit the packets of the second bit rate to the plurality of receiving terminals after receiving the feedback packet including information on the arrival delay time of the packets of the first bit rate. The feedback packet will be described later with reference to FIG. 4B.

On the other hand, the method of transmitting the packets is not limited thereto. For example, the transmitting terminal 200 can transmit packets of various bit rates to a plurality of receiving terminals continuously in accordance with a bit rate.

Packets of the set bit rate according to an embodiment of the present invention may be dummy packets that do not include data related to calls. According to an embodiment of the present invention, dummy packets satisfying the bit rate according to the communication method are transmitted by transmitting packets for predicting the network state between the transmitting terminal 200 and a plurality of receiving terminals. The transmission of dummy packets to a plurality of receiving terminals is not limited to the packets of the bit rate set in one embodiment of the present invention. Packets with an established bit rate may include at least one of audio and video information acquired by the transmitting terminal 200. [

The receiving unit 220 may receive a feedback packet including information on an arrival delay time of packets transmitted from the transmitting unit 210 to a plurality of receiving terminals, from each receiving terminal. The feedback packet may include information on the arrival delay time according to the bit rate of the transmitted packets.

According to an embodiment of the present invention, a plurality of feedback packets may be received according to the bit rate of the packets transmitted from the transmitter 210. According to another exemplary embodiment of the present invention, when the transmission unit 210 continuously transmits packets of various bit rates, one feedback packet is received for each receiving terminal, and the feedback packet includes an arrival delay time And may include identification information capable of distinguishing information. The structure of the feedback packet will be described later in detail with reference to FIG. 4B.

The determining unit 230 determines whether or not a call connection is established between the transmitting terminal 200 and the receiving terminal that has transmitted the feedback packet based on the information about the arrival delay time of the packets included in the feedback packet for each receiving terminal, Can be determined.

More specifically, the determination unit 230 determines whether a sum of a difference between a time interval for receiving each packet for a plurality of receiving terminals and a cycle for transmitting the packets by the transmitting terminal 200 It is possible to judge whether or not it is equal to or less than the set threshold value. As a result of the determination, if the average value of the time intervals for receiving the packets exceeds the threshold value set for the period in which the transmitting terminal 200 transmits packets, the transmitting terminal 200 can transmit a call termination signal to the receiving terminal.

On the other hand, if it is determined that the sum of the difference between the time interval for receiving each packet and the period for transmitting packets by the transmitting terminal 200 is less than the threshold value, the transmitting terminal 200 transmits a call connection signal to the receiving terminal 200 .

When transmitting the call connection signal, the call method can be determined using the bit rate information of the transmission packets included in the feedback packet. The calling method according to an embodiment of the present invention may include at least one of a voice call and a video call. In addition, the voice communication method can be distinguished from the case of using WB and the case of using NB according to the used bandwidth.

According to an embodiment of the present invention, when an existing call connection is established between a plurality of terminals, a new terminal can participate in a call between a plurality of terminals. According to an embodiment of the present invention, when a new terminal is capable of establishing a call connection with all of a plurality of terminals to which an existing call connection is established, a new terminal can participate in an existing call connection.

When a call is not connected between at least one receiving terminal and a transmitting terminal among a plurality of receiving terminals for which a conventional call connection is established, the transmitting terminal may not participate in the existing call connection have. If the new terminal fails to participate in the existing call connection, a signal indicating that the call is not connected to all of the plurality of receiving terminals performing the existing call connection can be transmitted.

3 is a block diagram illustrating a receiving terminal that performs call connection between a plurality of terminals according to an embodiment of the present invention.

3, the receiving terminal 300 according to an exemplary embodiment of the present invention may include a receiving unit 310, a measuring unit 320, and a transmitting unit 330. Referring to FIG. The receiving terminal 300 of FIG. 3 performs the same function as the receiving terminal 104 of FIG. 1 according to an embodiment of the present invention.

Only the components related to the present embodiment are shown in the receiving terminal 300 shown in Fig. Therefore, it will be understood by those skilled in the art that other general-purpose components other than the components shown in FIG. 3 may be further included.

The receiving unit 310 may receive packets of a predetermined bit rate transmitted from the transmitting terminal 200 to each of a plurality of receiving terminals including the receiving terminal 300. [ According to an exemplary embodiment of the present invention, packets having a preset bit rate may be transmitted from the transmitting terminal 200 at intervals of time according to a bit rate, and a series of packets may be transmitted continuously.

Specifically, when the preset bit rates of the packets are various kinds, packets of the first bit rate can be received from the transmitting terminal 200. The receiving terminal 300 can receive the packets of the second bit rate from the transmitting terminal 200 after transmitting the feedback packet including information on the arrival delay time of the packets of the first bit rate. The first bit rate is lower than the second bit rate.

On the other hand, the method of receiving the packets of the preset bit rate is not limited to this. For example, the receiving terminal 300 may receive packets of various bit rates from the transmitting terminal 200 continuously in accordance with the bit rate.

The measuring unit 320 may measure the arrival delay time of the packets transmitted from the transmitting terminal 200. The information on the arrival delay time of the packets may include information on the sum of the difference between the time interval in which the receiving terminal 300 receives the packets and the period in which the transmitting terminal transmits the packets.

The transmitting unit 320 may transmit a feedback packet including the arrival delay time information of the packets transmitted from the transmitting terminal 200 measured by the measuring unit 320 to the transmitting terminal 200. According to one embodiment of the present invention, the feedback packet can be transmitted according to the bit rate type of the received packets, and when one feedback packet is transmitted, Information may be included.

The transmitting terminal 200 extracts information on the arrival delay time from the feedback packet received from the transmitting unit 320 and transmits the packet to the transmitting terminal 200 at a time interval at which the receiving terminal 300 receives the packets, It is possible to judge whether or not the sum of the differences of the cycles is equal to or less than the set threshold value. The transmitting terminal 200 may determine whether or not the receiving terminal 300 has transmitted a feedback packet according to the determination result.

FIG. 4A is a diagram illustrating a packet of a predetermined bit rate according to an embodiment of the present invention.

4A, a packet 400 having a preset bit rate includes an IP (Internet Protocol) header 410, a UDP (User Datagram Protocol) header 420, a RTP (Real-time Transport Protocol) (PT) 440, an index 442, a timestamp 444, a timestamp 446 of the next packet, and a payload 448. The payload type (hereinafter, PT)

Only the components related to the present embodiment are shown in the packet 400 of the preset bit rate shown in FIG. 4A. Therefore, the structure of the packet 400 of the preset bit rate in the present invention is not limited to the structure of FIG. 4A.

Since the IP header 410 and the UDP header 420 can be inferred intuitively by those skilled in the art from the name, the description thereof will be omitted here.

The RTP header 430 in FIG. 4A includes RTP version information, padding bits, extension bits, number of CSRC (Contributing Source) identifiers, and markers among elements of a general RTP header. A description thereof will be omitted here because a person skilled in the art can intuitively deduce this from the name.

The PT 440 may include information on the type of the communication method according to the set bit rate. According to an embodiment of the present invention, a call method may include at least one of a video call and a voice call, and the voice call may be distinguished from a WB voice call and an NB voice call. For example, the PT 440 value for identifying the case of the NB voice call is 250, the PT 440 value for identifying the case of the WB voice call is 251, and the PT 440 value for identifying the case of the video call 252 < / RTI >

The index 442 may include information on how many packets the currently transmitted packet is when continuously transmitting the packets of the set bit rate. For example, if the index value is M, it is known that the current packet is the Mth transmitted packet.

The time stamp 444 may include information on the time when the transmitting terminal 200 transmits a packet.

It is possible to confirm whether the current packet is the last packet through the information displayed in the time stamp 445 of the next packet. Specifically, if the value of the time stamp 445 of the next packet of the currently received packet is 0, it can be confirmed that the currently received packet is the last packet received from the transmitting terminal 200.

The payload 448 may include information unrelated to the call connection between the transmitting terminal 200 and the receiving terminal 300. [ That is, the data included in the payload 448 may be used for the purpose of matching the set bit rate to predict the network state between the transmitting terminal 200 and the receiving terminal 300. However, the information included in the payload 448 is not limited thereto. According to another embodiment of the present invention, at least one of audio information and video information acquired from the transmitting terminal may be included in the payload area 448. [

4B is a diagram illustrating a feedback packet according to an embodiment of the present invention.

4B, the preset feedback packet 450 includes an IP header 460, a UDP header 470, an RTP header 480, a payload type (hereinafter referred to as PT) 490, a number of feedback packet types 492, a PT 494 according to the feedback packet, and network jitter 496.

Only the components related to the present embodiment are shown in the feedback packet 450 shown in Fig. 4B. Therefore, the structure of the feedback packet 450 in the present invention is not limited to FIG. 4B.

Since the IP header 460 and the UDP header 470 can be inferred intuitively by those skilled in the art from the name, the description thereof will be omitted here.

The RTP header 480 in FIG. 4B includes RTP version information, padding bits, extension bits, number of CSRC identifiers, and markers among elements of a general RTP header. A description thereof will be omitted here because a person skilled in the art can intuitively deduce this from the name.

The PT 490 may include information on the type of the communication method according to the set bit rate. According to an embodiment of the present invention, a call method may include at least one of a video call and a voice call, and the voice call may be distinguished from a WB voice call and an NB voice call.

The number 492 of feedback packet types may indicate the number of types of bit rates of packets received by the receiving terminal 300 in the case of continuously transmitting packets of various bit rates. For example, when bit rate packets according to a voice call using NB and bit rate packets according to voice call using WB are received, the number of feedback packet types can be two.

 The PT 494 according to the feedback packet may include information on what kind of call method is the feedback packet. For example, if the received packet is a feedback packet, it is determined that the type of the call method is a video call through the PT 494 value according to the feedback packet.

The network jitter 496 may include information on an arrival time delay of packets transmitted from the transmitting terminal 200 to the receiving terminal 300. Herein, the information on the arrival time delay may include information on the sum of the difference between the time interval in which the receiving terminal 300 receives each packet and the interval in which packets are transmitted in the transmitting terminal.

FIG. 5 is a graph illustrating a method of transmitting packets with a bit rate set according to a call method according to an embodiment of the present invention, with respect to time axis.

Referring to FIG. 5, packets 510 having a bit rate set according to an NB voice call, packets 520 having a bit rate set according to a WB voice call, and packets 530 having a bit rate set according to a video call Respectively.

In the graph shown in FIG. 5, the vertical axis indicates the size (N) of transmitted packets. On the other hand, the horizontal axis represents time and an index of a packet to be transmitted.

According to an embodiment of the present invention, it can be assumed that a bandwidth capable of transmitting 40000 bits per second is required to connect an NB voice call. When transmitting the NB voice call to the transmitting terminal 200 and the receiving terminal 300 when the number of packets transmitted from the transmitting terminal 200 to each of the plurality of receiving terminals is 50 in a second, Can be set to 800 bits, that is, 100 bytes. It is possible to predict whether the network state between the transmitting terminal 200 and the receiving terminal 300 is suitable for connecting the NB voice call by measuring the time interval at which the receiving terminal 300 receives the 100-byte packet.

According to an exemplary embodiment of the present invention, when a WB voice call is connected and a video call is connected, a higher bit rate may be required in case of connecting an NB voice call. Therefore, as shown in FIG. 5, a packet size larger than that of the NB voice call is required.

6 is a flowchart illustrating a method of connecting a call with a plurality of terminals in a transmitting terminal according to an exemplary embodiment of the present invention.

In step 610, the transmitting terminal 200 may transmit packets of a predetermined bit rate to each of the plurality of receiving terminals. The bit rate of the packets transmitted here can be set in consideration of the bit rate required according to the communication method when a plurality of terminals communicate with each other. The packets of the set bit rate can be used to predict the situation of the network when a communication is performed between terminals of a plurality of users.

In step 620, the transmitting terminal 200 may receive a feedback packet including information on the arrival delay time of the packets transmitted in step 610 from a plurality of receiving terminals.

In step 630, the transmitting terminal 200 may determine whether or not a call connection with a receiving terminal that has transmitted the feedback packet based on the information on the arrival delay time of the packets included in the feedback packet received in step 620 is performed. The process of determining whether or not the transmitting terminal makes a call connection with the receiving terminal based on the information on the arrival delay time will be described later in detail with reference to FIG. 8 to FIG.

7 is a flowchart illustrating a method of connecting a call with a plurality of terminals in a receiving terminal according to an embodiment of the present invention.

In step 710, the receiving terminal 300 may receive packets of a predetermined bit rate transmitted from the transmitting terminal 200 to each of a plurality of receiving terminals including the receiving terminal 300.

According to an exemplary embodiment of the present invention, packets having a preset bit rate may be transmitted from the transmitting terminal 200 at intervals of time according to a bit rate, and a series of packets may be transmitted continuously.

In step 720, the receiving terminal 300 may measure the arrival delay time of the packets transmitted in step 710.

In step 730, the receiving terminal 300 may transmit a feedback packet including information on the arrival delay time measured in step 720 to the transmitting terminal 200. The transmitting terminal 200 can determine whether or not the call connection with the receiving terminal that has transmitted the feedback packet based on the information on the arrival delay time included in the received feedback packet.

8 is a flowchart illustrating a process for determining whether a voice call connection is established between a plurality of terminals according to an exemplary embodiment of the present invention. According to an embodiment of the present invention, there is a WB voice communication method and an NB voice communication method in the case of a voice communication method.

In step 810, the transmitting terminal 200 may transmit packets having a bit rate set based on the NB voice call to each of a plurality of receiving terminals.

According to an embodiment of the present invention, when the bit rate is various, the transmitting terminal 200 preferentially transmits packets of low bit rate to the respective receiving terminals. Therefore, in step 810, the transmitting terminal 200 may preferentially transmit packets having a bit rate set based on the NB voice call, rather than packets having a bit rate set based on the WB voice call.

In step 820, the transmitting terminal 200 may determine whether to connect the NB voice call using the information on the arrival delay time of the packets transmitted to the plurality of receiving terminals in step 810.

Step 830 is a case where the transmitting terminal 200 fails to make an NB voice call connection with the receiving terminal because the arrival delay time of the packets transmitted in step 820 exceeds the threshold, And may transmit a call termination signal to the terminal.

In step 835, the transmitting terminal 200 may transmit packets having a bit rate set based on the WB voice call to the receiving terminal that has succeeded in the NB voice call connection when the arrival delay time of the packets transmitted in step 820 is less than or equal to the threshold value.

In step 840, the transmitting terminal 200 may determine whether to connect the WB voice call using the information on the arrival delay time of the packets transmitted to the plurality of receiving terminals in step 835.

In step 850, if the arrival delay time of the packets transmitted in step 840 exceeds the threshold value and the WB voice call connection with the receiving terminal fails, the transmitting terminal 200 starts the NB voice communication with the receiving terminal that failed in the WB voice call connection .

In step 860, when the arrival delay time of the packets transmitted in step 840 is less than or equal to the threshold value, the transmitting terminal 200 starts a WB voice call with the receiving terminal that succeeded in the WB voice call connection when the WB voice call connection with the receiving terminal is successful .

9 is a flowchart illustrating a process for determining whether a voice call and a video call are connected between a plurality of terminals according to an embodiment of the present invention. An embodiment of the present invention shown in FIG. 9 is a case in which a voice call method is not distinguished between an NB voice call and a WB voice call. However, the present invention is not limited to this embodiment.

In step 910, the transmitting terminal 200 may transmit packets having a bit rate set based on a voice call to a plurality of receiving terminals. According to an embodiment of the present invention, when the bit rate is various, the transmitting terminal 200 preferentially transmits packets of low bit rate to the respective receiving terminals. Therefore, in step 910, the transmitting terminal 200 may preferentially transmit the packets having the bit rate set based on the voice call, rather than packets having the bit rate set based on the video call.

In step 920, the transmitting terminal 200 may determine whether to establish a voice call using the information on the arrival delay time of the packets transmitted to the plurality of receiving terminals in step 910.

In step 930, when the transmission delay of the packets transmitted in step 920 exceeds a threshold value, the transmitting terminal 200 fails to establish a voice call with the receiving terminal. Lt; RTI ID = 0.0 > termination < / RTI >

In step 940, the transmitting terminal 200 may transmit packets having a bit rate set based on the video call to the receiving terminal that has succeeded in the voice call connection when the arrival delay time of the packets transmitted in step 920 is less than or equal to the threshold value.

In step 950, the transmitting terminal 200 may determine whether to connect the video call using the information on the arrival delay time of the packets transmitted to the plurality of receiving terminals in step 940.

In step 960, if the delay time of the packets transmitted in step 940 exceeds the threshold value and the video call connection with the receiving terminal fails, the transmitting terminal 200 can start a voice communication with the receiving terminal that failed in the video call connection.

In step 970, when the arrival delay time of the packets transmitted in step 940 is less than or equal to the threshold value, the transmitting terminal 200 can start the video communication with the receiving terminal that succeeded in the video call connection when the video call connection with the receiving terminal is successful.

10 is a flowchart illustrating a method of connecting a voice call when an existing call connection exists between a plurality of terminals according to an embodiment of the present invention. According to an embodiment of the present invention, there is a WB voice communication method and an NB voice communication method in the case of a voice communication method.

In step 1010, the transmitting terminal 200 can transmit packets having a bit rate set based on the NB voice call to each of a plurality of receiving terminals for which the existing call connection is established.

According to an embodiment of the present invention, when the bit rate is various, the transmitting terminal 200 preferentially transmits packets of low bit rate to the respective receiving terminals. Therefore, in step 1010, the transmitting terminal 200 may preferentially transmit the packets having the bit rate set based on the NB voice call over the packets having the bit rate set based on the WB voice call.

In step 1020, the transmitting terminal 200 may determine whether to connect the NB voice call using the information on the arrival delay time of the packets transmitted to the plurality of receiving terminals to which the existing call connection is established in step 1010. [ According to an embodiment of the present invention, when a call connection is attempted to a plurality of receiving terminals to which an existing call connection is established, a call connection can be made to all of the plurality of receiving terminals, Can only initiate a call.

In step 1030, if the transmitting terminal 200 fails to establish a call connection to all the receiving terminals in the NB voice call connection between the plurality of receiving terminals for which the existing call connection is established in step 1020, Can not participate in a call between a plurality of receiving terminals to which an existing call connection is established.

In step 1040, the transmitting terminal 200 can not transmit a signal indicating that the call connection has failed to each of the receiving terminals since it can not participate in the call connection with the plurality of receiving terminals for which the existing call connection is established in step 1030 have.

In step 1045, the transmitting terminal 200 may transmit packets of the bit rate set based on the WB voice call to all the receiving terminals that succeeded in the NB voice call connection in step 1020. [

In step 1050, the transmitting terminal 200 may determine whether to connect the WB voice call using the information on the arrival delay time of the packets transmitted to the receiving terminal in step 1045.

In step 1060, when the arrival delay time of the packets transmitted in step 1045 is equal to or less than the threshold value, the transmitting terminal 200 starts a WB voice call with the receiving terminal that succeeded in the WB voice call connection when the WB voice call connection with the receiving terminal is successful .

In step 1070, if the arrival delay time of the packets transmitted in step 1045 exceeds the threshold value and the WB voice call connection with the receiving terminal fails, the transmitting terminal 200 starts the NB voice communication with the receiving terminal that failed in WB voice call connection .

11 is a flowchart illustrating a method for connecting a voice call and a video call when an existing call connection exists between a plurality of terminals according to an exemplary embodiment of the present invention. An embodiment of the present invention shown in FIG. 11 is a case in which a voice call method is not distinguished between an NB voice call and a WB voice call. However, the present invention is not limited to this embodiment.

In step 1110, the transmitting terminal 200 may transmit packets having a bit rate set based on the voice call to each of a plurality of receiving terminals for which the existing call connection is established.

According to an embodiment of the present invention, when the bit rate is various, the transmitting terminal 200 preferentially transmits packets of low bit rate to the respective receiving terminals. Therefore, in step 1110, the transmitting terminal 200 may preferentially transmit the packets having the bit rate set based on the voice call, rather than packets having the bit rate set based on the video call.

In step 1120, the transmitting terminal 200 may determine whether or not the voice call connection is established by using the information on the arrival delay time of the packets transmitted to the plurality of receiving terminals for which the existing call connection is established in step 1110. [ According to an embodiment of the present invention, when a call connection is attempted to a plurality of receiving terminals to which an existing call connection is established, a call connection can be made to all of the plurality of receiving terminals, Can only initiate a call.

In step 1130, if the transmitting terminal 200 fails to establish a call connection to all receiving terminals in a voice call connection between a plurality of receiving terminals for which an existing call connection is established in step 1120, Can not participate in a call between a plurality of receiving terminals to which an existing call connection is established.

In step 1140, the transmitting terminal 200 can not transmit a signal indicating that the call connection has failed to each of the receiving terminals since it can not participate in the call connection with the plurality of receiving terminals for which the existing call connection is established in step 1130 have.

In step 1150, the transmitting terminal 200 may transmit packets of a bit rate set on a video call basis to all receiving terminals that have successfully made a voice call connection in step 1120. [

In step 1160, the transmitting terminal 200 may determine whether to make a video call connection using the information on the arrival delay time of the packets transmitted to the receiving terminal in step 1150.

In step 1170, when the arrival delay time of the packets transmitted in step 1150 is less than or equal to the threshold value, the transmitting terminal 200 can start a video call with the receiving terminal that succeeded in the video call connection when the video call connection with the receiving terminal is successful .

In step 1180, if the arrival delay time of the packets transmitted in step 1150 exceeds the threshold value and the video call connection with the receiving terminal fails, the transmitting terminal 200 can start a voice communication with the receiving terminal that failed in the video call connection .

An apparatus according to the present invention may include a processor, a memory for storing and executing program data, a permanent storage such as a disk drive, a communication port for communicating with an external device, a user interface such as a touch panel, a key, Devices, and the like. Methods implemented with software modules or algorithms may be stored on a computer readable recording medium as computer readable codes or program instructions executable on the processor. Here, the computer-readable recording medium may be a magnetic storage medium such as a read-only memory (ROM), a random-access memory (RAM), a floppy disk, a hard disk, ), And a DVD (Digital Versatile Disc). The computer-readable recording medium may be distributed over networked computer systems so that computer readable code can be stored and executed in a distributed manner. The medium is readable by a computer, stored in a memory, and executable on a processor.

All documents, including publications, patent applications, patents, etc., cited in the present invention may be incorporated into the present invention in the same manner as each cited document is shown individually and specifically in conjunction with one another, .

In order to facilitate understanding of the present invention, reference will be made to the preferred embodiments shown in the drawings, and specific terminology is used to describe the embodiments of the present invention. However, the present invention is not limited to the specific terminology, Lt; / RTI > may include all elements commonly conceivable by those skilled in the art.

The present invention may be represented by functional block configurations and various processing steps. These functional blocks may be implemented in a wide variety of hardware and / or software configurations that perform particular functions. For example, the present invention may include integrated circuit configurations, such as memory, processing, logic, look-up tables, etc., that may perform various functions by control of one or more microprocessors or other control devices Can be adopted. Similar to the components of the present invention that may be implemented with software programming or software components, the present invention may be implemented as a combination of C, C ++, and C ++, including various algorithms implemented with data structures, processes, routines, , Java (Java), assembler, and the like. Functional aspects may be implemented with algorithms running on one or more processors. Further, the present invention can employ conventional techniques for electronic environment setting, signal processing, and / or data processing. Terms such as "mechanism", "element", "means", "configuration" may be used broadly and are not limited to mechanical and physical configurations. The term may include the meaning of a series of routines of software in conjunction with a processor or the like.

The specific acts described in the present invention are, by way of example, not intended to limit the scope of the invention in any way. For brevity of description, descriptions of conventional electronic configurations, control systems, software, and other functional aspects of such systems may be omitted. Also, the connections or connecting members of the lines between the components shown in the figures are illustrative of functional connections and / or physical or circuit connections, which may be replaced or additionally provided by a variety of functional connections, physical Connection, or circuit connections. Also, unless explicitly mentioned, such as "essential "," importantly ", etc., it may not be a necessary component for application of the present invention.

The use of the terms "above" and similar indication words in the specification of the present invention (particularly in the claims) may refer to both singular and plural. In addition, in the present invention, when a range is described, it includes the invention to which the individual values belonging to the above range are applied (unless there is contradiction thereto), and each individual value constituting the above range is described in the detailed description of the invention The same. Finally, the steps may be performed in any suitable order, unless explicitly stated or contrary to the description of the steps constituting the method according to the invention. The present invention is not necessarily limited to the order of description of the above steps. The use of all examples or exemplary language (e.g., etc.) in this invention is for the purpose of describing the present invention only in detail and is not to be limited by the scope of the claims, It is not. It will also be appreciated by those skilled in the art that various modifications, combinations, and alterations may be made depending on design criteria and factors within the scope of the appended claims or equivalents thereof.

200: Terminal control device
210:
220:
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Claims (25)

In a method of communication between a plurality of terminals,
Transmitting, at a transmitting terminal, packets of a preset bit rate to each of a plurality of receiving terminals;
Receiving, from each of the receiving terminals, a feedback packet including information on an arrival delay time of the packets;
Determining whether the arrival delay time of the packets is less than or equal to a preset threshold value for the plurality of receiving terminals based on the time information included in the received feedback packet; And
And determining whether a call connection with a receiving terminal that has transmitted the feedback packet is established according to the determination result,
Wherein the information on the arrival delay time includes a difference in time of receiving each packet with respect to a transmission period of the packets. 2. The method according to claim 1,
Transmitting packets of a first bit rate to each of the plurality of receiving terminals in a transmitting terminal when the predetermined bit rates of the packets are different;
Receiving a feedback packet including information on an arrival delay time of packets of the first bit rate, and transmitting packets of a second bit rate higher than the first bit rate to the plurality of receiving terminals ≪ / RTI > 2. The method according to claim 1,
And connecting the call between the receiving terminal and the transmitting terminal when the arrival delay time is less than or equal to the set threshold value. 4. The method of claim 3,
Further comprising transmitting a call connection signal based on a call method corresponding to the set bit rate,
Wherein the call connection method comprises at least one of a voice call and a video call. 2. The method according to claim 1,
When it is determined that a call connection is not established between at least one receiving terminal and the transmitting terminal among the plurality of receiving terminals with respect to the plurality of receiving terminals for which the existing call connection is established, And transmitting a signal indicating that a call is not connected to all the plurality of receiving terminals without making a call connection to all of the receiving terminals. 2. The method of claim 1, wherein the transport packets comprise at least one of audio and video packets obtained by the transmitting terminal. In a method of communication between a plurality of terminals,
The method comprising the steps of: receiving, at a receiving terminal, packets of a predetermined bit rate transmitted from a transmitting terminal to each of a plurality of receiving terminals including the receiving terminal;
Measuring the arrival delay time of the packets by the receiving terminal; And
And transmitting a feedback packet including information on the arrival delay time to the transmitting terminal,
Wherein the information on the arrival delay time includes a difference in time of receiving each packet with respect to a transmission period of the packets,
Whether or not the call connection with the receiving terminal that has transmitted the feedback packet is determined based on the time information included in the received feedback packet by determining whether the arrival delay time of the packets is less than or equal to a preset threshold value And is determined by the transmitting terminal according to the result. 8. The method of claim 7,
Receiving, by the receiving terminal, packets of a first bit rate from the transmitting terminal when the preset bit rates of the packets are various types;
Further comprising receiving from the transmitting terminal a packet having a second bit rate after transmitting a feedback packet including information on an arrival delay time of the packets of the first bit rate to the transmitting terminal . 8. The method of claim 7, wherein the method comprises:
Further comprising the step of connecting a call with the transmitting terminal when the arrival delay time of the packets is less than or equal to a preset threshold value. 10. The method of claim 9,
Further comprising receiving from the transmitting terminal a call connection signal based on a call method corresponding to the set bit rate,
Wherein the call connection method comprises at least one of a voice call and a video call. 10. The method as claimed in claim 9,
When a call connection is not established between at least one receiving terminal of the plurality of receiving terminals and the transmitting terminal for the plurality of receiving terminals for which the existing call connection is established, Lt; RTI ID = 0.0 > not < / RTI > not connected. 8. The method of claim 7, wherein the transport packets comprise at least one of audio and video packets obtained by the transmitting terminal. A transmitting terminal for connecting a call between a plurality of terminals,
A transmitting unit for transmitting packets of a predetermined bit rate to each of the plurality of receiving terminals in the transmitting terminal;
A receiving unit for receiving, from each of the receiving terminals, a feedback packet including information on an arrival delay time of the packets; And
And transmitting a feedback packet to the plurality of receiving terminals based on a result of determining that the arrival delay time of the packets is less than or equal to a preset threshold based on the time information included in the received feedback packet, And a decision section for deciding whether or not to perform the determination,
Wherein the information on the arrival delay time includes a difference in time of receiving each packet with respect to a transmission period of the packets. 14. The apparatus of claim 13,
The transmitting terminal transmits packets of the first bit rate to each of the plurality of receiving terminals when the predetermined bit rate of the packets is different, and information on the arrival delay time of the packets of the first bit rate is included And transmits to the plurality of receiving terminals a packet having a second bit rate greater than the first bit rate. 14. The apparatus according to claim 13,
And a connection unit for connecting a call between the receiving terminal and the transmitting terminal when the arrival delay time is equal to or less than the set threshold value. 16. The apparatus of claim 15,
Transmits a call connection signal based on a call method corresponding to the set bit rate,
Wherein the call connection method comprises at least one of a voice call and a video call. 16. The apparatus of claim 15,
When it is determined that a call connection is not established between at least one receiving terminal and the transmitting terminal among the plurality of receiving terminals with respect to the plurality of receiving terminals for which the existing call connection is established, And transmits a signal indicating that a call is not connected to all of the plurality of receiving terminals without a call connection to all of the receiving terminals. 14. The method of claim 13,
And at least one of audio and video packets obtained by the transmitting terminal. A receiving device for connecting a call between a plurality of terminals,
A receiving unit for receiving packets of a predetermined bit rate transmitted from a receiving terminal to each of a plurality of receiving terminals including the receiving terminal;
A measuring unit for measuring arrival delay time of the packets by the receiving terminal; And
And a transmitter for transmitting a feedback packet including information on the arrival delay time to the transmitting terminal,
Wherein the information on the arrival delay time includes a difference in time of receiving each packet with respect to a transmission period of the packets,
Whether or not the call connection with the receiving terminal that has transmitted the feedback packet is determined based on the time information included in the received feedback packet by determining whether the arrival delay time of the packets is less than or equal to a preset threshold value for the plurality of receiving terminals And is thus determined by the transmitting terminal. 20. The apparatus of claim 19,
When the receiving terminal receives packets of the first bit rate from the transmitting terminal and transmits a feedback packet including information on the arrival delay time of the packets of the first bit rate, And receives packets of a second bit rate from the transmitting terminal after transmitting to the transmitting terminal. 20. The receiving device according to claim 19,
And when the arrival delay time of the packets is equal to or less than a preset threshold value, the call connection is established with the transmitting terminal. 22. The method of claim 21,
Receiving a call connection signal based on a call method corresponding to the set bit rate from the transmitting terminal,
Wherein the call connection method comprises at least one of a voice call and a video call. 22. The receiving device according to claim 21,
When a call connection is not established between at least one receiving terminal and the transmitting terminal among the plurality of receiving terminals with respect to the plurality of receiving terminals for which the existing call connection is established, Further comprising the step of: 20. The apparatus of claim 19, wherein the transport packets comprise at least one of audio and video information obtained by the transmitting terminal. A computer-readable recording medium having recorded thereon a program for causing a computer to execute the method according to any one of claims 1 to 12.

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