KR20150049064A - System for reducing delay of transmission and reception in communication network, apparatus thereof, method thereof and computer recordable medium storing the method - Google Patents

Abstract

The present invention relates to a system for reducing a transceiving delay in a communications network, a device for the same, a method for the same, and a computer-readable recording medium having the method recorded therein. The device comprises: a communications unit for transceiving bit streams with the other party user device connected with a media session; and a control unit for controlling a message for requesting for resetting a bandwidth to a second bandwidth to be transmitted to the other party user device through the communications unit when a bit rate of received bit streams, while the bit streams received from the other party user device through the communications unit are monitored, is less than a predetermined standard value about a first bandwidth set according to a bandwidth negotiation procedure with the other party user device. According to the present invention, according to a state of a communications network using mVoIP, a bandwidth set through a negotiation procedure during a session connection is reset corresponding to a network state, a transceiving delay can be reduced in a voice communications and a video communications using mVoIP. Accordingly, call qualities of the voice communications and video communications can be improved.

Description

[0001] The present invention relates to a system for reducing transmission / reception delay in a communication network, an apparatus therefor, a method for the same, and a computer readable recording medium on which the method is recorded medium storing the method}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates generally to a communication network technology, and more particularly, to a communication network technology in which, when a bit stream is transmitted and received with a counterpart user device to which a media session is connected in a communication network using mobile Voice of Internet Protocol (mVoIP) If the bit rate of the bit stream received during monitoring the bit stream is less than a preset reference value for the first bandwidth set in accordance with the bandwidth negotiation procedure with the counterpart user equipment, a bandwidth reset request message for requesting bandwidth reset to the second bandwidth To a system for reducing the transmission / reception delay by allowing the bandwidth to be reset by transmitting to the other user's device, a method therefor, and a computer readable recording medium on which the method is recorded.

In mVoIP, voice delay is the time it takes for a caller to receive a voice after it is sent, which is a key factor in quality in mVoIP. In addition, if the delay itself is small, it is not a problem. However, if the delay time increases, voice data that can not be combined or reproduced with voice data or can not be processed in the buffer may be generated. In this case, Therefore, the reproduced voice may be deteriorated. If a voice delay occurs, the conversation will be interrupted or the tempo will be disturbed. Even if the caller's voice is 100% correctly heard, if the delay is longer than a certain time, the conversation will be interrupted.

In case of voice / video delay of video telephony, as well as voice delay of mVoIP, if a delay occurs, the user will hesitate to use video call due to quality problem. Especially, since audio / video must be simultaneously processed in contrast to mVoIP voice call using audio only, it is necessary to adjust audio / video synchronization while ensuring real time, so that transmission / reception delay is minimized first Is required. In addition, in the United States and other countries, network delays are worsening due to a large network deviation in each region. Therefore, in order to provide stable services, an algorithm that minimizes delays is needed.

Korean Registered Patent No. 10-0902114 Registered on June 03, 2009 (Name: Apparatus and method for measuring end-to-end available bandwidth for multimedia streaming)

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and it is an object of the present invention to provide a method and apparatus for monitoring a bitstream received from a communication partner user apparatus, A bandwidth reset request message for requesting a bandwidth reset to a second bandwidth is transmitted to the counterpart user equipment to reset the bandwidth if the bandwidth is less than a preset reference value for the first bandwidth set in accordance with the bandwidth negotiation procedure with the device, A method therefor, and a computer readable recording medium on which the method is recorded.

According to another aspect of the present invention, there is provided an apparatus for reducing a transmission / reception delay, comprising: a communication unit for transmitting / receiving a bit stream to / from a counterpart user device to which a media session is connected; When the bit rate of the received bitstream is lower than a preset reference value for the first bandwidth set in accordance with the bandwidth negotiation procedure with the counterpart user device, a bandwidth reset request message requesting the bandwidth reset to the second bandwidth To the other user device via the communication unit.

The control unit resets the bandwidth to the second bandwidth when receiving a bandwidth setting completion message indicating that the other user equipment has reset the bandwidth to the second bandwidth through the communication unit.

The control unit erases a part of the bit stream stored in the buffer if the bit rate of the received bit stream is less than a preset reference value for the first bandwidth set according to the bandwidth negotiation procedure with the other user equipment.

The control unit transmits at least one bandwidth capable of being supported by the counterpart user equipment to the counterpart user equipment through the communication unit, receives from the counterpart user equipment a bandwidth that can be supported by the counterpart user equipment among at least one bandwidth that the counterpart user equipment can support, Is determined as the first bandwidth.

And the media of the media session is at least one of voice and image according to mVoIP (mobile Voice of Internet Protocol).

According to another aspect of the present invention, there is provided a system for reducing a transmission / reception delay, comprising: a second user equipment; A first user device that transmits a bandwidth reset request message requesting bandwidth reset to a second bandwidth to a second user device if the rate is below a preset reference for a first bandwidth set in accordance with a bandwidth negotiation procedure with a second user device, .

According to another aspect of the present invention, there is provided a method for reducing a transmission / reception delay, the method comprising the steps of: monitoring a bitstream received from a counterpart user equipment in which a media session is established; Determining whether a rate is less than a preset reference value for a first bandwidth set according to a bandwidth negotiation procedure with an opposite-party user apparatus; and if the bandwidth is less than a preset reference value as a result of the determination, And sending a request message to the other user device.

Receiving a bandwidth setting completion message informing that the other user equipment has reset the bandwidth to the second bandwidth from the other user equipment after the step of transmitting, and resetting the bandwidth to the second bandwidth.

And if it is determined that the number of packets is less than a preset reference value, the last packet is deleted according to the time stamp and the sequence number among a plurality of packets constituting the bit stream stored in the buffer, and the remaining packets are erased.

Transmitting at least one bandwidth capable of being supported by the counterpart user device to the counterpart user device before the monitoring step; receiving bandwidth that the counterpart user device can support from at least one bandwidth that the counterpart user device can support from the counterpart user device; And determining either one of the supported supported bandwidths as the first bandwidth.

In order to achieve the above objects, there is provided a computer-readable recording medium on which a method for reducing transmission / reception delay according to a preferred embodiment of the present invention is recorded.

As described above, according to the present invention, by reconfiguring the bandwidth set through the negotiation procedure in the session connection according to the network state according to the state of the communication network using mVoIP, it is possible to reduce the transmission / reception delay in voice call and video call using mVoIP have. Accordingly, it is possible to improve the communication quality of voice call and video call.

1 is a diagram for explaining a schematic configuration of a wireless communication system according to an embodiment of the present invention.
2 is a block diagram illustrating a schematic configuration of a user apparatus according to an embodiment of the present invention.
3 is a flowchart illustrating a bandwidth setting method according to an embodiment of the present invention.
4 is a flowchart illustrating a method for reducing a transmission / reception delay according to an embodiment of the present invention.
5 is a flowchart illustrating a method for reducing a transmission / reception delay of a user equipment according to an embodiment of the present invention.

Hereinafter, preferred embodiments according to the present invention will be described in detail with reference to the accompanying drawings. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The following detailed description, together with the accompanying drawings, is intended to illustrate exemplary embodiments of the invention and is not intended to represent the only embodiments in which the invention may be practiced. The following detailed description includes specific details in order to provide a thorough understanding of the present invention. However, those skilled in the art will appreciate that the present invention may be practiced without these specific details.

In some instances, well-known structures and devices may be omitted or may be shown in block diagram form, centering on the core functionality of each structure and device, to avoid obscuring the concepts of the present invention.

Throughout the specification, when an element is referred to as "comprising" or " including ", it is meant that the element does not exclude other elements, do. Also, the terms " part, "" module," and " module ", etc. in the specification mean a unit for processing at least one function or operation and may be implemented by hardware or software or a combination of hardware and software have. Also, the terms " a or ", "one "," the ", and the like are synonyms in the context of describing the invention (particularly in the context of the following claims) May be used in a sense including both singular and plural, unless the context clearly dictates otherwise.

1 is a diagram for explaining a schematic configuration of a communication system according to an embodiment of the present invention.

Referring to FIG. 1, a communication system according to an embodiment of the present invention includes a plurality of user devices 100 and a core device 200.

The user device 100 is a terminal capable of transmitting and receiving various data according to a key operation of a user. The user device 100 may be a tablet PC, a laptop, a personal computer (PC) A smart phone, a personal digital assistant (PDA), a smart TV, a mobile communication terminal, and the like.

The user device 100 refers to a terminal connected to a network supporting mVoIP and having a memory for storing a browser, a program and a protocol for mVoIP service, a processor for executing various programs and calculating and controlling the mVoIP service. That is, the user device 100 may be any device as long as it can connect to the core device 200 and execute various services such as voice call or video call according to the mVoIP, , A mobile communication terminal, a PDA, and the like. Meanwhile, the user device 100 is preferably formed with a touch screen, but is not limited thereto.

Particularly, the user apparatus 100 according to the embodiment of the present invention performs a session connection, a capperbility negotiation, and the like with the counterpart user device 100 through the core device 200, which is an entity located in the network, (E.g., voice, video, etc.) with the counterpart user device 100 through the created media session after creating the session. To this end, the user device 100 connects to the core device 200 when necessary, exchanges a message according to a Session Initiation Protocol (SIP) with the other user device 100, And establish a media session with the device 100 for voice or video calls. Then, the user device 100 can perform a voice or video call with the counterpart user device 100 through the set media session. When setting up such a media session, the user device 100 sets a bandwidth for transmitting / receiving media through bandwidth negotiation with the counterpart user device 100, and transmits / receives media (voice or image) in a bit stream according to the set bandwidth . At this time, it is preferable to use RTP (Real Time Protocol) as a protocol for transmitting and receiving media.

Meanwhile, the core apparatus 100 is a server located on a network, and is a device for performing a procedure such as authentication, location registration, service registration, call processing (session connection), etc. of a plurality of user apparatuses 100. Such a core apparatus 100 is shown and described as one apparatus, but is not limited thereto and may be composed of a plurality of apparatuses.

Here, the network may be an IMS (IP Multimedia Subsystem), and the core apparatus 100 may be an IMS server. In particular, the IMS server includes a Proxy Call State Control Function (P-CSCF), an Interrogating Call State Control Function (I-CSCF), and a Serving Call State Control Function (S-CSCF) . The IMS server 700 may be one in which the proxy control device P-CSCF, the connection control device I-CSCF, and the service control device S-CSCF are implemented as one device, Lt; / RTI >

This core device 100 is capable of communicating between the user device 100 and the user device 100 by communicating the messages to the other party user device 100 in order to exchange messages according to the SIP, A media session can be established.

According to the present invention, when a user device 100 transmits and receives a bit stream including media (e.g., audio, video, etc.) through a media session with a counterpart user device 100 to which a media session is connected, Lt; / RTI > At this time, it is determined whether or not a preset bandwidth resetting condition is satisfied. The bandwidth resetting condition may be a case where the bit rate of the received bit stream is lower than a preset reference value with respect to the first bandwidth set according to the bandwidth negotiation procedure with the counterpart user equipment. In this case, the user equipment 100 transmits a bandwidth reset request message requesting bandwidth reset to the second bandwidth to the counterpart user equipment 100 through the core device 200 to reset the bandwidth, thereby reducing the transmission / reception delay .

2 is a block diagram illustrating a schematic configuration of a user apparatus according to an embodiment of the present invention.

2, a user apparatus 100 according to an embodiment of the present invention includes a communication unit 110, a camera unit 120, an audio processing unit 130, and a control unit 140.

The communication unit 110 performs communication with the core device 200 through a network. For this, the communication unit 110 may include a transmitter for up-converting and amplifying the frequency of a transmitted signal, a receiver for low-noise amplifying (LNA) the received signal, and down-converting the frequency. The communication unit 110 may receive the signal through the wireless channel and output the signal to the control unit 140 and may transmit the signal output from the control unit 140 through the wireless channel.

The camera unit 110 may include a camera sensor and an image data processing unit. The camera sensor may include an imaging device such as a CCD (Charge Coupled Device) or a CMOS (Complementary Metal-Oxide Semiconductor) or a sensing module. The camera sensor receives light reflected from a subject and converts the light into an electrical signal. The image data processing unit may be implemented as an analog-to-digital converter. The image data processing unit converts an electric signal output from the camera sensor into a digital sequence and outputs the digital sequence as image data. The camera unit 110 captures an image for a video call and provides the captured image to the control unit 140.

The audio processing unit 130 includes a speaker SPK for reproducing audio data transmitted and received in the communication of the user apparatus 100 and a microphone MIC for collecting user's voice or other audio signals. The audio processing unit 130 is connected to a microphone MIC and a speaker SPK and converts the audio signal received from the microphone MIC into data and outputs the data to the control unit 140. The audio processing unit 130 converts the audio signal, (SPK) and outputs it as an audible sound. That is, the audio processing unit 130 converts an analog audio signal input from a microphone (MIC) into a digital audio signal, converts the digital audio signal input from the control unit 140 into an analog audio signal, do. In addition, the audio processing unit 130 can reproduce various audio components (for example, an audio signal for MP3 file playback or the like) generated by the user apparatus 100 according to a user's selection.

The control unit 140 may control the overall operation of the user device 100 and the signal flow between the internal blocks of the user device 100 and may perform a data processing function for processing the data. The controller 140 may be a processor such as a central processing unit (CPU).

The control unit 140 includes a CODEC, which includes an encoder for encoding a voice or video signal (bit stream) to be transmitted and a decoder for decoding a received voice or video signal (bit stream). In addition, the control unit 140 may further include a buffer for buffering the bit stream transmitted / received between the communication unit 110 and the codec.

The control unit 140 generates a SIP message according to need and transmits the generated SIP message to the counterpart user device 100 through the communication unit 110 or to the counterpart user device 100, And controls the user apparatus 100 according to the contents described in the SIP message.

In particular, in the procedure for connecting a media session for voice or video communication using mVoIP with the other user equipment 100, the control unit 140 may include at least one bandwidth that can be supported by the session connection request message, To the counterpart user device 100 via the Internet. In addition, the control unit 140 can receive a bandwidth that can be supported by the counterpart user equipment 100 through the communication unit 110 through a session connection acceptance message. In this case, the control unit 140 sets the bandwidth for the media. At this time, it is preferable that the bandwidth for the media is set to the maximum bandwidth among the bandwidths that can be supported by both of the plurality of user equipments 100 to which the session is connected.

When the media session is connected, the control unit 140 may transmit or receive the bit stream according to the set bandwidth. The control unit 140 encodes the voice inputted from the audio processing unit 130 and transmits the encoded voice through the communication unit 110 or transmits the video received from the camera unit 120 and the voice input from the audio processing unit 130 And then transmits the encoded voice and image through the communication unit 110 as a bitstream. Further, the received bitstream is decoded to extract voice, voice, and video, and output the extracted voice or voice and video.

At this time, the controller 140 monitors the bit rate of the bit stream received through the communication unit 110. According to this monitoring, the control unit 140 can determine whether or not the bandwidth resetting condition is satisfied.

For example, if the bitrate of the received bitstream is less than 20% of the bandwidth set in the negotiation process, a bandwidth reset message can be transmitted. This can happen because the network can not support the bandwidth set in the negotiation process due to deterioration of the network condition or the like.

If such a bandwidth resetting condition is satisfied, the control unit 140 erases a part of the data in the buffer. For example, if the bitrate of the received bitstream is less than 20% of the bandwidth set in the negotiation process, the current decoding process is delayed. Therefore, some data may be erased depending on the sequence number or time stamp of the bitstream , To recover the decoding delay. For example, if the initial buffer is allocated to five or more initial frames at a frame rate of 20 frames per second, the control unit 140 can secure a buffering time of 350 ms after connection of the media session. That is, the packets included in the bitstream received in the buffer are reordered based on the five buffers, and decoding is performed. In this case, if there is a delay, in order to eliminate accumulation due to the delay, when all five buffers are full, the sequence number or the time stamp is referred to, and only the packet of the last received bit stream is left, And decodes the packet of the newly received bit stream to ensure real-time performance.

In particular, if the bandwidth reset condition is satisfied, the control unit 140 determines a bandwidth to be reset and transmits a bandwidth reset request message including a bandwidth to be reconfigured to the counterpart user device 100 through the communication unit 110. [ Upon receiving the bandwidth reset request message, the counterpart user equipment 100 will reset the bandwidth and send a reset completion message. This reset completion message informs that the other user equipment 100 has reset the bandwidth. Accordingly, the control unit 140 can receive the reset completion message. Upon receiving the reset completion message, the control unit 140 can reset the bandwidth.

3 is a flowchart illustrating a bandwidth setting method according to an embodiment of the present invention. In Figure 3, it is assumed that the first user equipment 101 is the calling user equipment 100 and the second user equipment 102 is the called user equipment 100. [ It is also assumed that each of the first and second user devices 101 and 102 is registered in the core device 200. [

Referring to FIG. 3, the first user equipment 101 transmits a session connection request message requesting a connection of a media session of the second user equipment 102 in step S115. Here, the media session may be a session using Real-time Transport Protocol (RTP) and Real-time Transport Control Protocol (RTCP). In particular, the first user equipment 101 transmits a bandwidth request message including a bandwidth to the session connection request message for bandwidth negotiation. The bandwidth included in the session connection request message includes a plurality of bandwidths supported by the first user equipment 101. Here, the session connection request message may be an INVITE message according to SIP (Session Initiation Protocol). The plurality of bandwidths supported by the first user equipment 101 may be transmitted through a Session Description Protocol (SDP) message included in the INVITE message.

After receiving the session connection request message including the bandwidth supported by the first user equipment 101, the core device 200 delivers the session connection request message to the second user equipment 102 in step S120.

Upon receiving the session connection request message, the second user equipment 102 transmits at least one bandwidth supported by the second user equipment 102 among the bandwidths supported by the first user equipment 101 included in the session connection request message Select.

Then, the second user equipment 102 transmits a session connection acceptance message including at least one bandwidth supported by the second user equipment 102 in step S125. The session connection accept message may be a 200 OK message according to SIP. The 200 OK message includes an SDP message and the SDP message includes at least one bandwidth supported by the second user device 102. After receiving the session connection acceptance message, the core device 200 transmits the session connection acceptance message to the first user equipment 101 in step S130.

Upon receiving the session connection acceptance message, the first user equipment 101 selects one of the bandwidths supported by the second user equipment 102 included in the session connection acceptance message, Set the bandwidth to be used for transmission and reception. Then, the first user equipment 101 transmits a session connection confirmation message informing that the session connection acceptance message has been received in step S135. Here, the session connection confirmation message may be an ACK message according to the SIP. At this time, the first user equipment 101 transmits the session connection confirmation message including the bandwidth set by the first user equipment 101 itself. Here, the bandwidth set by the first user equipment 101 is described in the SDP message included in the session connection confirmation message and transmitted.

After receiving the session connection confirmation message, the core device 200 transmits a session connection confirmation message to the second user device 102 in step S140. Then, the second user equipment 102 sets the bandwidth used for transmission and reception of the bit stream in the corresponding bandwidth. Thereby, a media session 145 is connected between the first and second user devices 110 and 120. Bitstreams can be transmitted and received to each other according to RTP and RTCP through a connected media session.

4 is a flowchart illustrating a method for reducing a transmission / reception delay according to an embodiment of the present invention. It is assumed in FIG. 4 that the first user equipment 101 is the calling user equipment 100 and the second user equipment 102 is the called user equipment 100. It is also assumed that each of the first and second user devices 101 and 102 is registered in the core device 200. [ Furthermore, it is assumed that the first and second user equipments 101 and 102 negotiate the bandwidth and set up the media session 145 through the procedure of FIG. 3 described above. Here, the media may be media for audio or video.

Referring to FIG. 4, the first terminal 110 periodically monitors a bit stream transmitted and received in a streaming manner through the media session 145, determines whether the bandwidth should be reset according to predetermined conditions, If the condition is satisfied, the bandwidth resetting is determined in step S150. At this time, if the bandwidth resetting is determined, the first terminal 110 may selectively erase a part of the bitstream stored in the buffer.

Then, the first terminal 110 transmits a bandwidth reset message including the reset bandwidth so that the bandwidth is reset in step S155. Preferably, the first terminal 110 is set to one of the bandwidths that the second user device 102 can support. Here, the bandwidth reset message may use an Update Method according to SIP, for example.

For example, the source code described in the following Table 1 shows an example for transmitting the reset bandwidth when the bandwidth reset condition is satisfied.

if ((set_bandwidth_during_nego * 10) * 0.8> (rx_stream_bitrate * 10))
{
send_msg_to_peer (reset_bandwidth)
}

As shown in Table 1, if the bitrate of the received bitstream is less than 20% of the bandwidth set in the negotiation process, the bandwidth reset message can be transmitted. This can happen because the network can not support the bandwidth set in the negotiation process due to deterioration of the network condition or the like.

After receiving the bandwidth reset message, the core device 200 transmits a bandwidth reset message to the second user device 102 in step S160. The second user equipment 102 having received the bandwidth reset message can set the bandwidth to the reset bandwidth included in the bandwidth reset message in step S165.

Then, the second user equipment 102 transmits a bandwidth reset completion message informing that the bandwidth has been reset in step S170. In step S175, the core device 200 receives a bandwidth reset completion message and transmits a bandwidth reset completion message to the first user equipment 101. [ In step S180, the first user equipment 101, having received the bandwidth reset completion message, resets the bandwidth according to the reset bandwidth.

5 is a flowchart illustrating a method for reducing a transmission / reception delay of a user equipment according to an embodiment of the present invention. It is assumed in FIG. 5 that the first user equipment 101 is the calling user equipment 100 and the second user equipment 102 is the called user equipment 100. [ It is also assumed that each of the first and second user devices 101 and 102 is registered in the core device 200. [

5, the control unit 140 of the first user device 101 proceeds to establish a media session through the communication unit 110 in step S220 and negotiate with the second user device 102 to use the media It is assumed that the bandwidth is set.

More specifically, the control unit 140 of the first user equipment 101 includes at least one bandwidth that can be supported by the first user equipment 101 in the session connection request message, 2 user device 102 in accordance with the present invention. Accordingly, the second user equipment 102 will transmit a bandwidth that the second user equipment 102 itself can support, among the at least one bandwidth that the first user equipment 101 can support, through the session connection acceptance message. Then, the control unit 140 can receive a bandwidth that can be supported by the counterpart user equipment, that is, the second user equipment 102, through the communication unit 110. [ Then, the control unit 140 sets the bandwidth for the media to one of the bandwidths that the second user device 102 can support. At this time, it is preferable that the bandwidth for the media is set to the maximum bandwidth of the bandwidth that both the first and second user devices 110 and 120 can support.

The controller 140 monitors the bit rate of the bit stream received through the communication unit 110 in step S225. According to this monitoring, the controller 140 determines whether the bandwidth resetting condition is satisfied in step S230. For example, as shown in Table 1, if the bitrate of the received bitstream is less than 20% of the bandwidth set in the negotiation process, the bandwidth reset message can be transmitted. This can happen because the network can not support the bandwidth set in the negotiation process due to deterioration of the network condition or the like.

If the bandwidth resetting condition is satisfied, the control unit 140 deletes a part of the data in the buffer in step S235. In other words, satisfaction of the bandwidth reset condition means that a delay has occurred. Therefore, in order to eliminate accumulation of the buffer due to the delay, when the buffer is full, the sequence number or time stamp is referred to, It is possible to leave only the packets of the stream, erase the remaining packets in the buffer, and decode the packets of the newly received bit stream to ensure real-time performance.

In step S240, the controller 140 determines a bandwidth to be reconfigured and transmits a bandwidth reset request message including a bandwidth to be reconfigured to the second user device 102 through the communication unit 110. [

Upon receiving the bandwidth reset request message, the second user equipment 102 will reset the bandwidth and send a reset complete message. This reset completion message informs the second user device 102 that the bandwidth has been reset.

Accordingly, the controller 140 may receive the reset completion message in step S245. Upon receiving the reset completion message, the control unit 140 resets the bandwidth in step S250.

In step S255, the controller 140 determines whether the media session is terminated. If the media session is terminated, the controller 140 proceeds to step S260 and ends the process. Otherwise, the controller 140 repeats steps S225 to S255.

The method for reducing the transmission / reception delay according to the embodiment of the present invention as described above may be provided in the form of a computer readable medium suitable for storing computer program instructions and data. At this time, a computer-readable medium suitable for storing computer program instructions and data includes, for example, a magnetic medium such as a hard disk, a floppy disk and a magnetic tape, a compact disk read only memory (CD-ROM) Optical media such as a DVD (Digital Video Disk), a magneto-optical medium such as a floppy disk, and a ROM (Read Only Memory), a RAM , Random Access Memory), flash memory, EPROM (Erasable Programmable ROM), and EEPROM (Electrically Erasable Programmable ROM). The processor and memory may be supplemented by, or incorporated in, special purpose logic circuits. Examples of program instructions may include machine language code such as those generated by a compiler, as well as high-level language code that may be executed by a computer using an interpreter or the like. Such a hardware device may be configured to operate as one or more software modules to perform the operations of the present invention, and vice versa.

While the specification contains a number of specific implementation details, it should be understood that they are not to be construed as limitations on the scope of any invention or claim, but rather on the description of features that may be specific to a particular embodiment of a particular invention Should be understood. Certain features described herein in the context of separate embodiments may be implemented in combination in a single embodiment. Conversely, various features described in the context of a single embodiment may also be implemented in multiple embodiments, either individually or in any suitable subcombination. Further, although the features may operate in a particular combination and may be initially described as so claimed, one or more features from the claimed combination may in some cases be excluded from the combination, Or a variant of a subcombination.

Likewise, although the operations are depicted in the drawings in a particular order, it should be understood that such operations must be performed in that particular order or sequential order shown to achieve the desired result, or that all illustrated operations should be performed. In certain cases, multitasking and parallel processing may be advantageous. Also, the separation of the various system components of the above-described embodiments should not be understood as requiring such separation in all embodiments, and the described program components and systems will generally be integrated together into a single software product or packaged into multiple software products It should be understood.

It should be noted that the embodiments of the present invention disclosed in the present specification and drawings are only illustrative of specific examples for the purpose of understanding and are not intended to limit the scope of the present invention. It will be apparent to those skilled in the art that other modifications based on the technical idea of the present invention are possible in addition to the embodiments disclosed herein.

The present invention relates to a system for reducing transmission / reception delay in a communication network, an apparatus therefor, a method therefor, and a computer readable recording medium on which the method is recorded. A bit rate of a bitstream received while monitoring a bitstream received from a communication partner user equipment through a communication unit is less than a preset reference value for a first bandwidth set according to a bandwidth negotiation procedure with a counterparty user apparatus, And a control unit for controlling the communication unit to transmit a bandwidth reset request message for requesting a bandwidth reset to the second user equipment through the communication unit. system, On it is possible to provide a method and a computer-readable recording medium according to. As described above, according to the present invention, by reconfiguring the bandwidth set through the negotiation procedure in the session connection according to the network state according to the state of the communication network using mVoIP, it is possible to reduce the transmission / reception delay in voice call and video call using mVoIP have. Accordingly, it is possible to improve the communication quality of voice call and video call. This is not only a possibility of commercialization or sales, but also a possibility of being industrially applicable since it is practically possible to carry out clearly.

100: user equipment 101: first user equipment 102: second user equipment
110: communication unit 120: camera unit 130: audio processing unit
140: control unit 200: core device

Claims (11)

A communication unit for transmitting and receiving a bit stream to and from an opposite user apparatus to which a media session is connected; And
If the bit rate of the received bitstream is less than a preset reference value for a first bandwidth set according to a bandwidth negotiation procedure with the counterpart user equipment during monitoring of a bitstream received from the counterpart user equipment via the communication unit, And a controller for controlling the communication unit to transmit a bandwidth reset request message for requesting bandwidth reset to the counterpart user equipment through the communication unit. The method according to claim 1,
The control unit
Wherein the bandwidth reconfiguration unit resets the bandwidth to the second bandwidth upon receiving a bandwidth setting completion message indicating that the counterpart user equipment has reset the bandwidth to the second bandwidth through the communication unit. The method according to claim 1,
The control unit
And deleting a part of the bit stream stored in the buffer if the bit rate of the received bit stream is less than a preset reference value for the first bandwidth set according to the bandwidth negotiation procedure with the counterpart user equipment . The method according to claim 1,
The control unit
Wherein the control unit transmits at least one bandwidth capable of being supported by the counterpart user equipment to the counterpart user equipment through the communication unit, receives a bandwidth that the counterpart user equipment can support from at least one bandwidth supported by the counterpart user equipment, And determines one of the available bandwidths as the first bandwidth. The method according to claim 1,
The media of the media session
and a voice and / or image according to a mVoIP (Mobile Voice of Internet Protocol). A second user device; And
If a bit rate of the received bitstream during monitoring a bitstream received from the second user equipment is less than a preset reference value for a first bandwidth set according to a bandwidth negotiation procedure with the second user equipment, And a first user equipment for transmitting a bandwidth reset request message to the second user equipment requesting bandwidth re-establishment. Monitoring a bitstream received from a counterpart user device for which a media session is established;
Determining whether a bit rate of the received bitstream is less than a preset reference value for a first bandwidth set according to a bandwidth negotiation procedure with the counterpart user equipment; And
And transmitting a bandwidth reset request message requesting a bandwidth reset to a second bandwidth to the counterpart user equipment if the determined bandwidth is less than the preset reference value. 8. The method of claim 7,
After the transmitting step,
Receiving a bandwidth setting completion message from the counterpart user equipment to inform the counterpart user equipment that the bandwidth has been reset to the second bandwidth; And
And resetting the bandwidth to the second bandwidth. ≪ RTI ID = 0.0 > 31. < / RTI > 8. The method of claim 7,
If it is determined that the number of packets is less than the preset reference value, the last packet is left according to the time stamp and the sequence number among the plurality of packets constituting the bit stream stored in the buffer, Lt; RTI ID = 0.0 > transmission / reception < / RTI > delay. 8. The method of claim 7,
Before the monitoring step,
Transmitting at least one bandwidth capable of being supported by the counterpart user equipment to the counterpart user equipment;
Receiving from the counterpart user equipment a bandwidth that can be supported by the counterpart user equipment among at least one bandwidth that the counterpart user equipment can support; And
And determining one of the received supported bandwidths as the first bandwidth. ≪ Desc / Clms Page number 20 > 11. A computer-readable recording medium on which a method for reducing transmission and reception delay according to any one of claims 7 to 10 is recorded.

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