KR100652574B1 - Streaming system and adaptive bandwidth allocation method - Google Patents

Abstract

The present invention relates to a streaming system and an adaptive band allocation method. In the related art, a large buffer is used on a client side in a streaming service to prepare for data loss, and there is a problem of having a delay time of several seconds required for data buffering when a service is changed. . In view of the above problems, the present invention periodically receives statistical information including received signal quality, throughput, buffer level, and packet error rate as a result of packet transmission and reception from a service quality monitor in a service quality manager, and statistical information in real time in case of an emergency report message. Based on the received statistical information and the quality of service capability of the multimedia encoder and the wireless module, streaming is performed by performing different quality of service policies combined with at least one of bandwidth extension, code rate / timer frequency adjustment, and service interruption. A streaming server providing a service; Client that extracts the monitoring information on the media stream received from the streaming server, and delivers the monitoring information in real time by controlling the output time of the timer to the service quality manager of the streaming server through a report message By providing streaming operation conditions according to the change, it is possible to stably perform data buffering in each streaming operation mode to prevent data discontinuity of voice and video, thereby improving service quality.

Description

Streaming system and adaptive band allocation method {STREAMING SYSTEM AND ADAPTIVE BANDWIDTH ALLOCATION METHOD}

1 is a block diagram showing the configuration of a conventional streaming system.

2 is a block diagram showing a server configuration of a streaming system according to an embodiment of the present invention.

3 is a block diagram showing a client configuration of a streaming system according to an embodiment of the present invention.

4 is a flowchart illustrating an adaptive band allocation method of a streaming system according to an exemplary embodiment of the present invention.

5 is an operation flowchart of a method of adjusting a bit rate, an encoding rate, and a timer frequency with the first quality of service policy of FIG. 4;

6 is an operational flowchart of a method of adjusting a bit rate with the second quality of service policy of FIG.

7 is a flowchart illustrating a method of adjusting an encoding rate and a timer frequency using the third quality of service policy of FIG. 4.

8 is an operation flowchart of a method of determining service continuation / stop without using a quality of service policy in the adaptive band allocation method as the fourth quality of service policy of FIG.

** Description of the symbols for the main parts of the drawings **

23: Quality of Service Manager 26: Streaming Engine

34: Quality of Service Clients 35: Quality of Service Monitors

The present invention relates to a streaming system and an adaptive band allocation method, and in particular, to determine a quality of service policy based on processing capability of an encoder and a wireless module, and to improve the quality of service by providing a streaming operation condition according to a change in a wireless environment. A streaming system and adaptive band allocation method.

The home network system includes a wireless network module to provide data-based services such as file transmission and reception and Internet access, as well as streaming multimedia contents. Unlike the operation of reading and playing a video file from a storage medium, the streaming service outputs a video by simultaneously downloading and playing a voice and video from a server.

The conventional streaming system guarantees the quality of a streaming service in a wireless environment by gradually adjusting the streaming bit rate by using the state information of the wireless network based on the statistical information of the received packet. The method of controlling the streaming bit rate is to provide a streaming service using a file encoded in an audio and video format that allows a variable bit rate on the server side, and to stream content encoded and encoded at a real-time variable bit rate. Used.

1 is a block diagram showing the configuration of a conventional streaming system, as shown therein, a streaming server 11 for streaming data through a designated socket connection upon request from a client side; Clients 12 and 13 receive the streamed data, store it in the streaming buffer, and deliver the receiving side statistical information to the streaming server.

The streaming server 11 stores multimedia content in a storage medium of the hard disk and streams data through a designated socket connection when a content request is received from the client 12 or 13. At this time, the streaming server 11 analyzes the header of the stored stream, checks the format and data bandwidth of the stream to be transmitted, determines the data transmission rate, and transmits data through the socket.

The streaming server 11 transmits the sending side statistical information (time stamp, cumulative number of packets) of the media session connected with the client 12, 13 to the client 12, 13, and the client 12, 13 receives Side statistics information (cumulative lost packet count, packet jitter) is transmitted to the streaming server 11. The streaming system defines the necessary monitoring information and sends and receives the monitoring information between the server and the client to determine the status of the counterpart for the streaming session.

Wireless environment degradation (attenuation, interference noise, fading), which often occurs in wireless networks, causes loss of data transmitted over the network, so that the degradation of the wireless environment is difficult for streaming services that need to deliver large amounts of data in real time. There is a need for a method for suppressing deterioration in quality of service. In particular, when it is determined that the available bandwidth is less than the required data rate due to the deterioration of the wireless environment, a quality of service policy that can overcome this is needed.

In general, as a method for compensating for data loss due to deterioration of wireless environment during streaming service, a large buffer is used on the client side to prepare for data loss. However, the method prevents client-side voice or video discontinuity due to deterioration of the wireless environment, but increases the delay time of data transmission and reception, and thus has a delay time of several seconds required for data buffering at the time of service change (channel change).

In addition, data buffering of the streaming service on the client side increases the memory capacity required for data storage, thereby increasing the complexity and cost of device configuration due to the addition of memory. Therefore, there is a need for a method of improving service quality while minimizing memory capacity required for streaming services.

Accordingly, the present invention has been made in view of the above problems, and the service quality policy is determined by the processing capability of the encoder and the wireless module, and the streaming operation conditions can be provided according to the change of the wireless environment to improve the service quality. It is an object of the present invention to provide a streaming system and an adaptive band allocation method.

The present invention for achieving the above object, in the service quality manager periodically receives statistical information including the received signal quality, throughput, buffer level, packet error rate of the packet transmission and reception result from the service quality monitor, In the case of receiving the statistical information in real time, based on the received statistical information and the capability of supporting the quality of service of the multimedia encoder and the wireless module, different quality of service combined with at least one of bandwidth extension, code rate / timer frequency adjustment, and service interruption A streaming server providing a streaming service by performing a policy; And extracting monitoring information about the media stream received from the streaming server and delivering the monitoring information to the service quality manager of the streaming server through a report message in real time by controlling the output time of the timer. .

In the service quality manager, the method further includes periodically receiving statistical information that is a result of packet transmission and reception from a service quality monitor, and receiving statistical information in real time in case of an emergency report message; Providing a streaming service by performing different service quality policies divided into four cases according to the difference between the service quality support capability of the multimedia encoder and the service quality support capability of the wireless module based on the received statistical information; If the four quality of service policies do not meet the required quality of service in the current network state, it is characterized in that the step of determining the service suspension and notifying the user.

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

FIG. 2 is a block diagram illustrating a server configuration of a streaming system according to an exemplary embodiment of the present invention. As shown in FIG. A quality of service manager 23 for determining a policy regarding required resource allocation using state information and for determining a coding rate of the multimedia encoder 22;

A signaling interface 24 for setting a data band required by the media stream through a parameterized quality of service support function supported by the media control layer of the radio module 29 according to the resource allocation policy of the quality of service manager 23;

A multimedia encoder 22 for changing data rates by output rate determination by the service quality manager 23 and outputting data;

A data storage unit 27 for storing multimedia data;

It consists of a streaming engine 26 that receives the streaming source from the multimedia encoder 22 and the data storage unit 27, generates a packet in the form of a packet, and outputs it to the client through the socket interface 28 in real time by controlling the output time of the timer. do.

The quality of service manager 23 uses the server-side / client-side state information to determine the necessary policy regarding resource allocation, and state information of jitter, delay, throughput, and packet error rate through the client-side RTCP RR (Receiver Report) message. Get the buffer level and monitoring information according to the application through the RR message generated by the quality of service monitor.

The signaling interface 24 sets a data band required by the media stream through a parameterized quality of service support function supported by the media control layer of the wireless module 29 according to the resource allocation policy of the quality of service manager 23.

The multimedia encoder 22 outputs data by changing the coding rate by determining the coding rate of the service quality manager 23.

The data storage unit 27 stores multimedia data, and the streaming engine 26 receives a streaming source from the multimedia encoder 22 and the data storage unit 27 and generates a RTP packet to generate an RTP packet output time. The control outputs via the socket interface 28 in real time.

The socket interface 28 delivers the RTP packet to the radio module 29 through the network layer, and the radio module 29 provides a media control layer and converts the digital data of the RTP packet into radio frequency signals to transmit and receive.

3 is a block diagram illustrating a client configuration of a streaming system according to an exemplary embodiment of the present invention. As shown in FIG. 3, a socket interface for transmitting an RTP packet of a wireless module 31 to a streaming buffer 36 through a network layer is illustrated in FIG. 32);

A signaling interface 33 for setting a data band required by the media stream of the socket interface 32 according to the resource allocation policy of the quality of service manager of the streaming server;

A quality of service client 34 that controls the wireless module 31 through the signaling interface 33 in accordance with the band allocation policy determined by the quality of service manager of the streaming server;

One instance for each media session, extracting monitoring information about RTP packets and media streams received through RTCP SRs, and periodically and immediately monitoring information to the streaming server's quality of service manager via RTCP RR messages. It is composed of a quality of service monitor (35) to transfer.

The wireless module 31 provides a media control layer and converts radio frequency signals into digital data to receive RTP packets, and the socket interface 32 sends the RTP packets of the wireless module 31 through the network layer to the streaming buffer 36. To pass).

The streaming buffer 36 removes the headers from the rearranged RTP packets in the order transmitted from the streaming server by rearranging the order of the RTP packets not sequentially received, and outputs them to the audio / video decoder 37. 37) decodes the RTP packet and outputs audio / video to the display unit.

The signaling interface 33 sets a data band required by the media stream through a parameterized quality of service support function supported by the media control layer of the wireless module 31 according to the resource allocation policy of the quality of service manager of the streaming server. The quality of service client 34 controls the wireless module 31 via the signaling interface 33 in accordance with the band allocation policy determined by the quality of service manager of the streaming server.

The quality of service monitor 35 has one instance for each media session, extracts the monitoring information for the media stream received through the RTP packet and the sender report (SR) of the RTCP, and the RTCP RR message for the streaming server. Deliver to Quality of Service Manager.

4 is an operation flowchart of an adaptive band allocation method of a streaming system according to an exemplary embodiment of the present invention. As shown in FIG. 4, the service quality manager periodically receives statistical information that is a result of packet transmission and reception from a service quality monitor, and reports an emergency report. Receiving statistical information in real time in the case of a message; Providing a streaming service by performing different service quality policies divided into four cases according to the difference between the service quality support capability of the multimedia encoder and the service quality support capability of the wireless module based on the received statistical information; For the four quality of service policies, if the current quality of service does not satisfy the required quality of service, the service stops and a user is notified.

When a streaming server of a streaming system receives a streaming source from a multimedia encoder or a data storage unit, a service quality support policy is determined according to the data processing capability of the multimedia encoder and the streaming engine.

The bit rate in the multimedia encoder is classified into adaptive bit rate adjustment, fixed output bit rate, and variable output bit rate, and the capability of supporting quality of service in the multimedia encoder depends on the attribute of the bit rate.

In consideration of the maximum bit rate of the variable bit rate, the streaming server assumes the bit rate fixed type and divides the three bit rate categories into two bit rate categories and divides them into bit rate adaptive and bit rate fixed (output bit rate fixed and output bit rate variable).

The streaming server is divided into three media access methods according to the packet transmission / reception scheme supported by the media control layer of the radio module: a contention method, a priority method, and a method of guaranteeing a bit rate by the requested bandwidth. Although the priority method transmits with a difference in priority according to streams, but does not guarantee the actual bit rate, the streaming server assumes the priority method as a competitive method and categorizes the categories of the three medium approaches into the categories of the two medium approaches. And classify the data rate as the requested bandwidth (bit rate guarantee method) and competition method (competition method and priority method). The quality of service support capability in the wireless module depends on the nature of the medium approach.

The quality of service manager of the streaming server uses different quality of service policies divided into four cases according to the difference between the quality of service capability of the multimedia encoder and the quality of service of the wireless module.

No Encoder, Support Capability of Wireless Modules Quality of service policy One  Bit rate adaptive, bit rate guarantee First policy 2  Bit rate fixed, bit rate guaranteed Second policy 3  Bitrate Adaptive, Competition Method Third policy 4  Bit rate fixed, competitive method Fourth policy

The quality of service manager periodically receives statistical information (eg, every 500 milliseconds) that is a result of packet transmission and reception from the quality of service monitor, and receives statistical information in real time in case of an emergency report message. The statistical information of the quality of service monitor is packet loss rate (PER), throughput (THROUGHPUT), buffer level (BUFFER_LEVEL), and received signal quality (SIGNAL_QUALITY). In particular, when the value of the received signal quality fluctuates greatly, the client transmits the received signal quality value to the server in real time along with other statistical information.

The service quality manager provides a streaming service by performing different service quality policies divided into four cases according to the difference between the service quality support capability of the multimedia encoder and the service quality support capability of the wireless module based on the received statistical information.

The quality of service manager can decide to stop the service for four quality of service policies. If the quality of service does not meet the required quality of service in the current network state, the service quality manager makes the service stop decision.

The quality of service manager increases the warning count (SERVICE_WARNING_COUNT) when the packet loss and the buffer level is below a certain level, and determines that the service is stopped when the warning count is greater than or equal to a predetermined threshold. That is, when it is determined that the signal quality is excellent in the feedback statistical information, the service quality manager resets the warning coefficient to prolong the service stop time and stops the service when it is determined that the poor reception state is maintained for a predetermined time.

Reduction of client-side buffered data is accompanied by discontinuity of video and audio data. If the client-side buffered data continues to be exhausted, it may lead to data depletion even with a slight degradation of wireless environment.

Therefore, the streaming server should recover the buffer level as soon as possible in the near and depleted state of client-side data to prepare for degradation of the wireless environment. To this end, the streaming server periodically detects anomalies in the value of radio reception quality indicators (eg, RSSI in WLAN, here referred to as signal quality) from the client-side radio module rather than relying on client-side statistical information as soon as possible. Detects and drops the encoding rate (ENCODING_RATE) one step (for example, for encoders that support 2, 4, 6, or 8 Mbps, and reduces it to 4 Mbps if the current encoding rate is 6 Mbps). Output to the socket.

If the coder can dynamically change the code rate, the service quality manager restores the client-side buffer level by applying a bit rate adaptive quality of service policy. As described above, the service quality manager performs streaming based on the received statistical information by performing different service quality policies divided into four cases according to the difference between the service quality support capability of the multimedia encoder and the service quality support capability of the wireless module. Provide service.

When the encoder supports bit rate adaptation and the wireless module supports the bit rate guarantee method, the streaming server applies the first quality of service policy.

FIG. 5 is a flowchart illustrating a method of adjusting a bit rate, an encoding rate, and a timer frequency using the first quality of service policy of FIG. 4. As shown in FIG. 5, if a signal quality report is received from a service quality manager, the signal quality is less than a predetermined threshold. Determining a value of less than one step and reducing the code rate by one step and decreasing the timer frequency according to the changed code rate; Bandwidth extension by determining throughput, buffer level, and packet error rate from the client-side report message to determine whether the packet error rate is zero, throughput is greater than coding rate / 2, throughput is greater than coding rate, or buffer level is above the lower threshold. Determining code rate / timer frequency adjustment, service interruption; If the packet error rate is zero and the throughput is equal to or greater than the coding rate, increasing the coding rate by one step, increasing the timer frequency in accordance with the coding rate, and initializing the service warning count; Reducing the bit rate by a predetermined bandwidth if the bit rate is different from the initial value and returning the service continuation and returning the service continuation if it is equal to the initial value; Returning a service continuation if the packet error rate is zero and the throughput is greater than code rate / 2 and less than code rate; If the packet error rate is zero and the throughput is less than the coding rate / 2, determining whether the buffer level is above the lower limit threshold, and if true, increasing the bit rate by a predetermined bandwidth if there is available bandwidth; Increasing the coding rate by one step if there is no available bandwidth when the packet error rate is not zero and the buffer level is above the lower limit threshold, increasing the timer frequency in accordance with the coding rate, and returning service continuation; If the packet error rate is not zero and the buffer level is below the lower limit threshold, the service warning count is incremented, and if the service warning count is above the predetermined threshold, the service interruption is returned.

Scenarios that can occur in a streaming service in a wireless environment are divided into three situations where the packet loss rate is zero, sometimes zero, and often zero / always zero.

If the packet loss rate is zero and the throughput is good, the quality of service manager does not apply a separate quality of service policy. If the packet loss rate is zero or the throughput is poor (for example, the throughput is less than 50 percent of the encoding rate). Apply a quality of service policy to

The quality of service manager receives the signal quality report to reduce the coding rate by one step if the signal quality is less than the predetermined threshold and adjust the timer frequency according to the changed coding rate.

The quality of service manager extracts the throughput, buffer level, and packet error rate from the report message on the client side, and determines whether the packet error rate is zero, the throughput is greater than the encoding rate / 2, the throughput is greater than the encoding rate, or the buffer level is above the lower threshold. The decision is made to determine bandwidth extension, code rate / timer frequency adjustment, and service interruption.

If the packet error rate is zero and the throughput is greater than or equal to the encoding rate, the quality of service manager increases the encoding rate by one step, increases the timer frequency according to the encoding rate, and initializes the service warning count. And, if the bit rate is different from the initial value, the quality of service manager reduces the bit rate (data bandwidth) by a predetermined bandwidth and returns the service continuation and returns the service continuation if it is equal to the initial value.

The quality of service manager returns service continuity if the packet error rate is zero and the throughput is greater than code rate / 2 and less than code rate.

The quality of service manager determines if the packet error rate is zero and the throughput is less than the coding rate / 2, and if the buffer level is above the lower limit threshold. If true, the service quality manager increases the bit rate by a predetermined bandwidth and returns the service continuation if there is an available bandwidth.

The quality of service manager increases the coding rate by one step if there is no available bandwidth when the packet error rate is not zero and the buffer level exceeds the lower limit threshold, increases the timer frequency according to the coding rate, and returns service continuation.

The quality of service manager increments the service alert count if the packet error rate is non-zero and the buffer level is below the lower limit threshold and returns a service interruption if the service alert count is above the predetermined threshold.

When the encoder supports the fixed bit rate and the wireless module supports the bit rate guarantee method, the streaming server applies the second quality of service policy.

FIG. 6 is a flowchart illustrating a method of adjusting a bit rate using the second quality of service policy of FIG. 4. As shown in FIG. 6, a throughput, a buffer level, and a packet error rate are extracted from a report message of a client, and the packet error rate is zero. Determining bandwidth expansion and service interruption by determining whether the throughput is greater than the coding rate / 2, the throughput is greater than the coding rate, or the buffer level is above the lower limit threshold; Initializing the service warning count if the packet error rate is zero and the throughput is equal to or greater than the encoding rate, decreasing the bit rate by a predetermined bandwidth if the bit rate is different from the initial value, returning the service continuation, and returning the service continuation if it is equal to the initial value; Returning a service continuation if the packet error rate is zero and the throughput is greater than code rate / 2 and less than code rate; If the packet error rate is not zero and the buffer level is above the lower limit threshold, increasing the bit rate by a predetermined bandwidth if there is available bandwidth and returning service continuation; If the packet error rate is not zero and the buffer level is below the lower limit threshold, the service alert count is incremented and if the server alert count is above the predetermined threshold, the service interruption is returned.

The quality of service manager extracts the throughput, buffer level, and packet error rate from the report message on the client side, and determines whether the packet error rate is zero, the throughput is greater than the encoding rate / 2, the throughput is greater than the encoding rate, or the buffer level is above the lower threshold. Determine bandwidth expansion and service interruption.

The quality of service manager initializes the service warning count if the packet error rate is zero and the throughput is higher than the coding rate. If the bit rate is different from the initial value, the service quality manager reduces the bit rate (data bandwidth) by a predetermined bandwidth and returns the service continuation and if it is equal to the initial value, Returns to continue

The quality of service manager returns service continuity if the packet error rate is zero and the throughput is greater than code rate / 2 and less than code rate.

The quality of service manager increases the bit rate by a predetermined bandwidth and returns service continuity if there is available bandwidth if the packet error rate is not zero and the buffer level is above the lower limit threshold.

The quality of service manager increments the service alert count if the packet error rate is not zero and the buffer level is below the lower limit threshold and returns a service interruption if the service alert count is above the predetermined threshold.

The streaming server applies a third quality of service policy when the encoder supports bit rate adaptation and the radio module supports the competition method.

FIG. 7 is a flowchart illustrating a method of adjusting an encoding rate and a timer frequency according to the third quality of service policy of FIG. 4. As shown in FIG. 4, when a signal quality report is received and the signal quality is less than a predetermined threshold, the coding rate is reduced by one step. Adjusting the timer frequency according to the changed coding rate; The throughput, buffer level, and packet error rate are extracted from the report message on the client side, and the packet rate is determined by determining whether the packet error rate is zero, the throughput is higher than the encoding rate / 2, the throughput is higher than the encoding rate, or the buffer level is higher than the lower limit threshold. Determining timer frequency adjustment, service interruption; If the packet error rate is zero and the throughput is equal to or greater than the coding rate, increasing the coding rate by one step, increasing the timer frequency in accordance with the changed coding rate, initializing the service alert count, and returning the service continuation; Returning a service continuation if the packet error rate is zero and the throughput is greater than code rate / 2 and less than code rate; If the packet error rate is zero and the throughput is less than or equal to the coding rate / 2 or the packet error rate is not zero, if the buffer level is above the lower threshold, reduce the coding rate by one step, reduce the timer frequency in accordance with the coding rate, and return the service continuation. Wow; If the packet error rate is not zero and the buffer level is below the lower limit threshold, the service alert count is incremented and if the server alert count is above the predetermined threshold, the service interruption is returned.

The quality of service manager receives the signal quality report to reduce the coding rate by one step if the signal quality is less than the predetermined threshold and adjust the timer frequency according to the changed coding rate.

The quality of service manager extracts the throughput, buffer level, and packet error rate from the report message on the client side, and determines whether the packet error rate is zero, the throughput is greater than the encoding rate / 2, the throughput is greater than the encoding rate, or the buffer level is above the lower threshold. Determine the code rate / timer frequency adjustment, service interruption.

If the packet error rate is zero and the processing direction is higher than the coding rate, the service quality manager increases the coding rate by one step, increases the timer frequency according to the changed coding rate, initializes the service warning count, and returns the service continuation.

The quality of service manager returns service continuity if the packet error rate is zero and the throughput is greater than code rate / 2 and less than code rate.

The quality of service manager decreases the encoding rate by one step if the packet error rate is zero and the throughput is less than the coding rate / 2 or the packet error rate is nonzero, and the buffer level is higher than the lower limit threshold. Returns.

The quality of service manager increments the service alert count if the packet error rate is not zero and the buffer level is below the lower limit threshold and returns a service interruption if the service alert count is above the predetermined threshold.

The streaming server applies the fourth quality of service policy when the encoder supports the fixed bit rate and the radio module supports the competition method.

FIG. 8 is a flowchart illustrating a method of determining whether to continue or stop a service without using a fourth quality of service policy in the adaptive band allocation method of FIG. 4. As shown in FIG. Extracting a packet error rate and determining service interruption by determining whether the packet error rate is zero, the throughput is greater than the coding rate / 2, the throughput is greater than the coding rate, or the buffer level is greater than the lower threshold; Initializing the service warning count and returning service continuation if the packet error rate is zero and the throughput is equal to or greater than the coding rate; If the packet error rate is zero and throughput is less than or equal to coding rate / 2 or the packet error rate is not zero, the service continues to return if the buffer level is above the lower threshold; if it is below the lower threshold, the service alert count is incremented and if the server alert count is above the predetermined threshold Returning a service outage.

The quality of service manager extracts the throughput, buffer level, and packet error rate from the report message on the client side, and determines whether the packet error rate is zero, the throughput is greater than the encoding rate / 2, the throughput is greater than the encoding rate, or the buffer level is above the lower threshold. Judgment is made to determine service interruption.

The quality of service manager initializes the service alert count and returns service continuation if the packet error rate is zero and the throughput is greater than or equal to the coding rate.

The quality of service manager returns service continuation if the buffer level is above the lower threshold when the packet error rate is zero and throughput is less than the coding rate / 2 or the packet error rate is not zero. If the threshold is exceeded, the service interruption is returned.

The service quality manager receives the report message from the client side until the service interruption decision is made, and performs streaming service by performing different service quality policies according to the difference of the service quality support capability. If a service interruption is determined, the quality of service manager notifies the user of the interruption of the streaming service.

As described in detail above, the present invention determines the quality of service policy based on the processing capability of the encoder and the wireless module, and provides the streaming operation condition according to the change of the wireless environment, thereby stably performing data buffering in each streaming operation mode. In addition, the service quality can be improved by preventing data discontinuities in the video.                     

In addition, by applying the quality of service policy based on the monitoring data for each session in the streaming system, it is possible to reduce the memory capacity required on the client side and to ensure improved streaming continuity.

Claims (11)

The service quality manager periodically receives statistical information including received signal quality, throughput, buffer level, and packet error rate as a result of packet transmission and reception from the service quality monitor, and receives statistical information in real time in case of an emergency report message, thereby receiving the received statistics. Streaming server that provides streaming service by executing different quality of service policies combined with at least one of bandwidth extension, code rate / timer frequency adjustment, and service interruption based on information and ability to support quality of multimedia encoder and wireless module. Wow; And extracting monitoring information on the media stream received from the streaming server and delivering the monitoring information to the service quality manager of the streaming server through a report message in real time by controlling the output time of the timer. Streaming system. The method of claim 1, wherein the streaming server Obtain the buffer level and monitoring information through the report message generated by the quality of service monitor of the client and use the server side / client side information to determine the bandwidth according to the difference between the quality of service capability of the multimedia encoder and the quality of service of the wireless module. A service quality manager configured to perform different service quality policies combined with at least one of extension, the code rate / timer frequency adjustment, and the service interruption, and determine a code rate of a multimedia encoder; A signaling interface for setting a data band required by the media stream through a parameterized quality of service support function supported by the media control layer of the wireless module according to a resource allocation policy of the quality of service manager; Streaming system comprising a multimedia encoder, a streaming engine for receiving a streaming source from the data storage unit in the form of a packet to output to the client in real time by controlling the output time of the timer. The method of claim 1, wherein the client A quality of service client for controlling the wireless module through the signaling interface according to the bandwidth allocation policy determined by the quality of service manager of the streaming server; Quality of service that has one instance for each media session, extracts monitoring information about media streams received from streaming server, and delivers the monitoring information periodically and immediately by report message to service quality manager of streaming server. Streaming system comprising a monitor. Periodically receiving, by the service quality manager, statistical information such as a received signal quality, a throughput, a buffer level, and a packet error rate as a result of packet transmission and reception from a service quality monitor, and receiving statistical information in real time in case of an emergency report message; Based on the received statistical information, different service qualities combined by at least one of bandwidth extension, coding rate / timer frequency adjustment, and service interruption according to a difference between the service quality support capability of the multimedia encoder and the service quality support capability of the wireless module. Providing a streaming service by performing a policy; And if the service quality policy does not satisfy the required quality of service in the current network state, determining a service stop and notifying the user. The method of claim 4, wherein the performing of the first quality of service policy in the performing of the quality of service policy is as follows. Receiving a signal quality report to determine whether the signal quality is below a predetermined threshold, and if it is below, reducing the coding rate by one step and decreasing the timer frequency in accordance with the changed coding rate; Bandwidth extension by determining throughput, buffer level, and packet error rate from the client-side report message to determine whether the packet error rate is zero, throughput is greater than coding rate / 2, throughput is greater than coding rate, or buffer level is above the lower threshold. And determining a code rate / timer frequency control and a service interruption. The method of claim 4, wherein the performing of the second quality of service policy is performed in the performing of the quality of service policy. Bandwidth extension by extracting throughput, buffer level, and packet error rate from the report message on the client side, determining whether the packet error rate is zero, throughput is over coding rate / 2, throughput is over coding rate, or buffer level is over the lower threshold And determining service interruption. The method of claim 4, wherein the performing of the third quality of service policy in the performing of the quality of service policy is Receiving a signal quality report and reducing the coding rate by one step if the signal quality is less than a predetermined threshold and adjusting the timer frequency according to the changed coding rate; The throughput, buffer level, and packet error rate are extracted from the report message on the client side, and the packet rate is determined by determining whether the packet error rate is zero, the throughput is higher than the encoding rate / 2, the throughput is higher than the encoding rate, or the buffer level is higher than the lower limit threshold. Adaptive frequency allocation method of a streaming system, characterized in that it is determined to adjust the frequency / timer, the service interruption. The method of claim 4, wherein the performing of the fourth quality of service policy is performed in the performing of the quality of service policy. Service throughput is extracted by extracting the throughput, buffer level, and packet error rate from the report message on the client side, and determining whether the packet error rate is zero, throughput is greater than coding rate / 2, throughput is greater than coding rate, or buffer level is above the lower threshold. Adaptive band allocation method of a streaming system, characterized in that it is made to determine. The method of claim 5 or 6, wherein the bandwidth expansion step is Reducing the bit rate by a predetermined bandwidth and returning a service continuation if the packet error rate is zero, the throughput is greater than the coding rate, and the bit rate is different from the initial value, and returning the service continuation if it is equal to the initial value; If the packet error rate is zero and the throughput is less than the coding rate / 2, it is determined whether the buffer level exceeds the lower limit threshold. If true, the packet error rate is increased by a predetermined bandwidth if there is available bandwidth. Adaptive Bandwidth Allocation Method for Streaming Systems. The method of claim 5 or 7, wherein the code rate / timer frequency adjustment step is performed. If the packet error rate is zero and the throughput is equal to or greater than the coding rate, increasing the coding rate by one step and increasing the timer frequency in accordance with the coding rate; If the packet error rate is not zero and there is no available bandwidth when the buffer level is higher than the lower limit threshold, increasing the coding rate by one step, increasing the timer frequency according to the coding rate and returning service continuation. Adaptive Bandwidth Allocation Method in Streaming Systems. The method of any one of claims 5 to 8, wherein the determining of the service interruption is Initializing the service warning count and returning service continuation if the packet error rate is zero and the throughput is equal to or greater than the coding rate; If the packet error rate is zero and throughput is less than coding rate / 2 or the packet error rate is nonzero or the buffer level is above the lower threshold, then service continues. Returning service interruption; and adaptive bandwidth allocation method of a streaming system.

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