KR20100003114A - Method for transmitting/receiving multimedia data based on object using priority - Google Patents

Method for transmitting/receiving multimedia data based on object using priority Download PDF

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Publication number
KR20100003114A
KR20100003114A KR1020080063226A KR20080063226A KR20100003114A KR 20100003114 A KR20100003114 A KR 20100003114A KR 1020080063226 A KR1020080063226 A KR 1020080063226A KR 20080063226 A KR20080063226 A KR 20080063226A KR 20100003114 A KR20100003114 A KR 20100003114A
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KR
South Korea
Prior art keywords
priority
multimedia data
transmitting
based multimedia
ack
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KR1020080063226A
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Korean (ko)
Inventor
김철승
노재훈
류규태
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주식회사 케이티
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Priority to KR1020080063226A priority Critical patent/KR20100003114A/en
Publication of KR20100003114A publication Critical patent/KR20100003114A/en

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/0413—MIMO systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
    • H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
    • H04B7/0619—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal using feedback from receiving side
    • H04B7/0621—Feedback content
    • H04B7/0623—Auxiliary parameters, e.g. power control [PCB] or not acknowledged commands [NACK], used as feedback information
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04H—BROADCAST COMMUNICATION
    • H04H20/00—Arrangements for broadcast or for distribution combined with broadcast
    • H04H20/65—Arrangements characterised by transmission systems for broadcast
    • H04H20/71—Wireless systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L41/00—Arrangements for maintenance, administration or management of data switching networks, e.g. of packet switching networks
    • H04L41/50—Network service management, e.g. ensuring proper service fulfilment according to agreements
    • H04L41/5003—Managing SLA; Interaction between SLA and QoS
    • H04L41/5019—Ensuring fulfilment of SLA
    • H04L41/5022—Ensuring fulfilment of SLA by giving priorities, e.g. assigning classes of service

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

The present invention relates to a method for transmitting / receiving object-based multimedia data using priority. In the multi-input / output (MIMO) mobile environment, a transmitting side that transmits multimedia data considers the importance (priority) of each object and gains an important object. The transmission side transmits a reception completion response signal (ACK) only to an object of high importance among the received objects, thereby minimizing deterioration of image quality even when the radio channel condition deteriorates.

To this end, the present invention, in the object-based multimedia data downlink transmission method applied to a wireless access device having a MIMO antenna, the priority step of checking the priority of the object by analyzing the multimedia packet received from the streaming server; And the higher priority object is transmitted to a user terminal through a beam having a higher gain in the MIMO antenna, and a reception completion response signal (ACK) is received from the user terminal for an object having a priority higher than a predetermined reference value. And repeating the transmission a predetermined number of times until a) is received.

Description

Object-based multimedia data transmission / reception method using priority {METHOD FOR TRANSMITTING / RECEIVING MULTIMEDIA DATA BASED ON OBJECT USING PRIORITY}

The present invention relates to a method for transmitting / receiving object-based multimedia data using priority, and more particularly, to a transmitter for streaming multimedia data in a MIMO mobile environment, in consideration of importance (priority) for each object, a gain is gained for an important object. Through the transmission of this high beam, the reception side transmits a reception completion response signal (ACK) only to the objects of high importance among the received objects, thereby minimizing deterioration of image quality even when the radio channel condition is deteriorated. Object based multimedia data transmission / reception method using priority.

MPEG4 is used as video streaming codec in mobile environment. In MPEG4, importance and priority are recorded in a codec flag for each object in a video. Flags of major objects, such as the face of a person, have a "1" written on them, and a relatively low-value object, such as a background, has a low flag value corresponding to the flag.

When using a multiplexing or space-division multiple access (SDMA) technique such as BLAST (Bell LAyered Space-Time architecture) under a multiple input / output (MIMO) environment, each terminal uses As many as the number of streams (multimedia streams such as video, audio, etc.) can be received.

The current video streaming method unilaterally transmits video data regardless of codec such as MPEG4 or MPEG2. As such, when the video is streamed and transmitted in the conventional streaming method, a frame may be broken due to a decrease in signal to interference and noise ratio (SINR). In this case, the entire screen frame is broken so that the corresponding image cannot be recognized. There is.

However, in the case of transmitting multimedia data, although the state of the channel (particularly, the wireless channel) is deteriorated, the less important object is broken, but the main object on the screen should be protected. In particular, since the mobile terminal has a small liquid crystal screen, the user does not feel the difference in image quality even when MPEG-4 encoded objects are received in perfect form. Therefore, in the mobile terminal, it is necessary to first guarantee the quality of the main video objects and voice data.

The conventional video streaming method performs video streaming transmission using a protocol such as User Datagram Protocol (UDP) or Real-time Transport Protocol (RTP). In this case, unlike the TCP (Transmission Control Protocol) protocol, when the UDP or RTP protocol is used, the reception completion response signal (ACK) is not transmitted. There is a problem that there is no method to prevent this.

In the prior art as described above, the reception completion response signal (ACK) is not transmitted at all in response to the reception completion response signal (ACK) or the reception completion response signal (ACK). There is a problem in that the image quality deterioration may occur due to the overhead of or an important object is not received, it is an object of the present invention to solve this problem.

The objects of the present invention are not limited to the above-mentioned objects, and other objects and advantages of the present invention which are not mentioned above can be understood by the following description, and will be more clearly understood by the embodiments of the present invention. Also, it will be readily appreciated that the objects and advantages of the present invention may be realized by the means and combinations thereof indicated in the claims.

In order to solve the above object, the present invention transmits (uploads or downloads) an important object through a beam having high gain in consideration of the importance (priority) of each object in a transmitting side transmitting multimedia data in a MIMO mobile environment. In addition, the receiving side may be configured to feedback the reception completion response signal (ACK) only to the objects of high importance among the received objects.

More particularly, the present invention provides an object-based multimedia data transmission method applied to a streaming server, the method comprising: separating one image frame into a plurality of objects; Assigning priority to each of the separated objects according to importance; And selecting and transmitting an object having a predetermined priority or more according to the channel state.

In addition, the present invention, the object-based multimedia data downlink transmission method applied to a wireless access device having a MIMO antenna, the ranking step of checking the priority of the object by analyzing the multimedia packet received from the streaming server; The higher priority of the identified object is transmitted to the user terminal through a beam having a higher gain in the MIMO antenna, and a reception completion response signal (ACK) is received from the user terminal for an object having a priority higher than a predetermined reference value. And repeatedly transmitting a predetermined number of times until is received.

The present invention also provides a method for receiving object-based multimedia data, comprising: a priority checking step of analyzing a received multimedia packet to confirm priority of a corresponding object; And a reception response step of transmitting a reception complete response signal (ACK) to the transmitter for the object having the checked priority level equal to or greater than a predetermined reference value.

As described above, the present invention transmits an acknowledgment signal (ACK) only to an object having a high priority, so that quality of the main objects and voice data can be guaranteed first. In particular, since the mobile terminal has a small liquid crystal display, the user does not feel a difference in image quality even when MPEG-4 encoded objects are received in perfect form. Therefore, if only the main objects and the voice data are received without loss, the user will hardly notice the deterioration of image quality.

In addition, the present invention can prevent excessive occurrence of the ACK feedback overhead, there is an effect that can prevent the degradation of the image quality compared to the case of using only the UDP protocol that does not transmit the ACK. That is, according to the present invention, by setting a priority value in relation to when to send an ACK, it is possible to set which priority or higher objects to protect. Furthermore, the present invention transmits the uplink by controlling the generation amount of the ACK. There is an effect that can control the amount of ACK packets.

The above objects, features and advantages will become more apparent from the following detailed description taken in conjunction with the accompanying drawings, whereby those skilled in the art may easily implement the technical idea of the present invention. There will be. In addition, in describing the present invention, when it is determined that the detailed description of the known technology related to the present invention may unnecessarily obscure the gist of the present invention, the detailed description thereof will be omitted. Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is an overall explanatory diagram of object-based multimedia data transmission / reception using priority according to the present invention. A base station router (BSR) is a device that combines a radio access system (RAS) function and an access control router (ACR) function. In the present invention, a base station router (BSR) is used. The device, BSR, etc. may be referred to as a "wireless access device", hereinafter simply referred to as "BSR".

In order to efficiently provide IP multimedia service in the current wireless network situation, a new concept of a base station router (BSR) has emerged, which is a physical component of various network functions such as a base station, a control station, and a gateway router. To integrate.

First, the general characteristics (solution principle) of the present invention will be described.

According to the cross layer approach, when the multiplexing or SDMA technique is applied, the present invention first sends the most important of the objects of MPEG4 to the stream having the highest gain of each beam, and then the relatively low An object with priority transmits in the form of a stream on a low-gain beam.

In this case, when providing MPEG4 video streaming between the BSR 12 and the user terminal 14, the streaming is provided by UDP or RTP, and the user terminal transmits the ACK only for the main object. That is, the user terminal 14 does not always transmit the ACK, but transmits the ACK only to the main object.

The field of the MPEG4 object is application layer information, and the ACK is a message transmitted from the network layer. In addition, beam information having the largest gain value is information of a physical layer.

The BSR 12 selects and transmits a beam by using the application information, and the user terminal 14 checks the priority information of the object in the received application information and feeds back an ACK.

Hereinafter, referring to FIG. 1, each of the streaming server 10, the BSR 12, and the user terminal 14 will be described.

The streaming server 10 providing a service may provide a streaming service by converting original video data into MPEG-1, 2, 3, 4, and 7. That is, the streaming server 10 divides an image frame into a plurality of objects, gives priority to each of the separated objects, and selects and transmits only objects having a predetermined priority or higher in consideration of channel conditions. This will be described in detail with reference to FIG. 5.

Then, the BSR 12 checks the priority of the corresponding object by analyzing the multimedia packet received from the streaming server 10, and the higher the object, the higher the gain in the MIMO antenna (Beam) through the user terminal (Beam) 14). This will be described in detail with reference to FIG. 6.

The user terminal 14 analyzes the multimedia packet received from the BSR 12, checks the priority of the object, and then transmits a reception completion response signal (ACK) only to the packet whose priority is equal to or greater than a predetermined reference value. To send. This will be described in detail with reference to FIG. 7.

In the present invention, a MIMO antenna is used between the user terminal 14 and the BSR 12, and in a multiplexing mode, a plurality of streams can be simultaneously transmitted. Then, packets with high priority of the object are transmitted to the stream having a large channel gain value for each stream.

2 is a diagram illustrating an embodiment of multimedia data transmission between a streaming server and a BSR according to the present invention.

In case of providing video streaming service by applying MPEG-4, the available data rates are 19.5Mbps for HDTV and 6Mbps for SDTV. The MPEG-4 codec can reduce the amount of information on one image screen by adjusting the frame rate. The MPEG-4 codec configures one image information into I, B, and P frames in order to provide a streaming service. I, B, and P frames correspond to object information, respectively. For example, in one screen with a person and a car in a specific background, "person", "car", and "background" correspond to objects, and one screen is composed of three objects. And, one object may be composed of one or more packets.

According to the original operation of the codec of the MPEG-4, when the channel transmission speed becomes poor, it is possible to selectively exclude relatively less important frames. That is, I frame and B frame are important objects, so they can be transmitted as they are, and P frames are not important objects, so they can be discarded. By doing so, it is possible to reduce the amount of data transmitted to the network as a whole and to stably stream important image images without breaking them.

For example, if a person (I), a car (B), a background (P) frame is transmitted, but the channel condition deteriorates, only the people (I) and car (B) frames are transmitted. If the channel condition worsens, sending only human (I) frames lowers the transmission rate of packets sent to the network.

Adaptive Source Encoder 20 is located within Streaming Server 10, which increases or decreases the packet rate by changing the encoding data rate of MPEG-4. To perform the function. In the case of a VoIP voice channel, adaptive multi-rate (AMR) that variably allocates a voice codec mode in a BSR operates and adjusts a data packet transmission size according to a physical channel environment of a user terminal. That is, the adaptive source encoder 20 improves call quality and reduces packet loss by providing a variable bit rate according to the fluid physical channel characteristics.

The BSR transmission / reception control unit 24 controls the packet transmission rate in association with the adaptive source encoder 20 of the streaming server. According to an embodiment, in consideration of the case where the function of the adaptive source encoder is not implemented in the streaming server 10, the function of the adaptive source encoder may be implemented in the BSR transmission / reception control unit 24. However, only when the streaming server 10 does not have an adaptive source encoder function, the BSR transmission / reception control unit 24 operates the adaptive source encoder function. In addition, the BSR transmission / reception control unit 24 controls the transmission rate of the packet received in each queue of the service classification unit (DiffServ) 23.

The adaptive source encoder 20 determines the packet transmission rate according to the control message received from the BSR transmission / reception control unit 24 (that is, the control message for allocating bandwidth). As a result of the transmission rate determination, when the transmission rate is high, all B, I, and P frames are transmitted (“21a” and “21b” arrows in FIG. 2), and when the transmission rate is lowered, B, I having a high priority (the Only "22a" and "22b" arrows are transmitted first.

There are three traffic classes in the service classification unit (DiffServ) 23. In addition, service priorities are divided into high, middle, and low. Here, 'Class 1' may mean a VOIP service, 'Class 2' may mean an MPEG video streaming service, and 'Class 3' may mean a data service (web browsing). have.

The BSR transmission / reception control unit 24 is located in a service classification unit (DiffServ) 23.

There are two types of storage in the BSR: first, three queues in the DiffServ 23 managed by the BSR transmit / receive control unit 924, and second, MAC packet classifiers ( 321 is five MAC queues that classify traffic for MAC scheduling.

Then, the BSR transmission and reception control unit 24 classifies the packets received from the streaming server 10 according to priority and distributes them to each class queue. In the service classification unit (DiffServ), there are three kinds of class queues managed by the BSR transmission / reception control unit 24, and these queues are classified into high, middle, and low according to their priority. .

The BSR transmission / reception control unit 24 monitors the amount of data stored in each queue in the DiffServ 23, and when the packet received from the streaming server 10 overflows as a result of the monitoring, streaming to transmit the packet. The control message is sent to the adaptive source encoder 20 of the server 10 to lower the encoding rate of the MPEG-4 and lower the packet transmission rate. In the case of VoIP voice channel, the AMR voice codec mode is changed to lower the data rate.

When the packet of the BSR transmission / reception control unit 24 is full and the packet can no longer be received from the streaming server 10, the BSR transmission / reception control unit 24 sends a control message to the MAC scheduler 26. When MAC scheduling is performed, the scheduling order is changed to be transmitted first by increasing the priority of the corresponding class packet.

Since the transmission and reception speed of one queue is lowered, bandwidth remains. In order to utilize the remaining bandwidth, the BSR transmit / receive control unit 24 sends a control message to the adaptive source encoder 20 of the streaming server to increase the transmission rate of packets sent to other queues.

The message sent by the BSR transmission / reception control unit 24 includes the estimated time taken to exit the MAC scheduler 26 and the amount of packets accumulated in the queue of the service classification unit (DiffServ) 23.

3 is a detailed configuration diagram of an embodiment of a BSR according to the present invention, and includes a service classification unit (DiffServ) 23 and a MAC processing unit 25 as shown in the figure. Since the operation of the BSR transmission and reception control unit 24 has been described in detail with reference to FIG. 2, it will be omitted.

The DiffServ packet classifier 301 classifies the packet transmitted by the streaming server 10 into three classes (High, Middle Low) according to priority and stores the packet in the corresponding buffer.

The MAC packet classifier 321 classifies five packets in the queue in the service classifier (DiffServ) 23 according to the traffic class. Packets in the "High" class are stored in MAC queues "1" and "2", depending on the traffic class. Packets in the "Middle" class are stored in MAC queue "3", and in the "Low" class. Packets are stored in MAC queues "4" and "5" according to the traffic class. A scheduler 323 in the MAC scheduler 26 allows packets with a high MAC traffic class to be transmitted over a high gain beam (see 324).

4 is a configuration diagram of a BSR transmission and reception control unit.

As illustrated in FIG. 4, the BSR transmission / reception control unit 24 has three class buffers, and the sizes of the buffers vary according to the class level. The DiffServ packet classifier 301 classifies the packet transmitted by the streaming server 10 into three classes (High, Middle Low) according to priority and stores the packet in the corresponding buffer.

In addition, the BSR transmission and reception control unit 24 includes a guard channel allocation module 41 for handoff, a new call blocking determination module 42, a call drop determination module 43, and a bandwidth allocation module 44 for each class. do.

The dynamic bandwidth allocation method in the BSR transmission / reception control unit 24 controls the bandwidth used for reception by each class in the packet classifier 301 of the service classification unit (DiffServ) 23.

The BSR transmission and reception control unit 24 transmits a control message for allocating a bandwidth to the streaming server 10 to adjust the bandwidth by adjusting the encoding rate of the streaming server 10. At this time, how much to increase the bandwidth, utilizing the information reported from the MAC scheduler 26 (e.g., scheduling delay required until transmission to the radio section for each class at the MAC level), the received bandwidth Can be adjusted.

5 is a flowchart illustrating an embodiment of an object-based multimedia data transmission method applied to a streaming server according to the present invention.

After the streaming server 10 divides one image frame into a plurality of objects (500), priority is given to each of the separated objects according to importance (502).

Thereafter, the streaming server 10 selects and transmits an object having a predetermined priority or more according to the channel state (504). Here, the channel state indicates "the radio channel state between the BSR 12 and the user terminal 14" transmitted from the BSR 12.

In detail, the selective transmission of the object will be described. When the channel state deteriorates, the P frame is discarded and the I frame and the B frame are selectively transmitted.

FIG. 6 is a flowchart illustrating an object-based multimedia data downlink transmission method applied to a BSR having a MIMO antenna according to the present invention, and illustrates a method of transmitting from the BSR 12 to the user terminal 14.

The BSR 12 analyzes the multimedia packet received from the streaming server 10 and checks the priority of the corresponding object (600). As a result, the higher priority object has a higher gain beam at the MIMO antenna. The transmission is transmitted to the user terminal 14 through 602. In this case, the object having a priority higher than a predetermined reference value is repeatedly transmitted a predetermined number of times until the reception completion response signal ACK is received from the user terminal 14 (604).

In addition, in transmitting an object to the user terminal 14, the BSR may select and transmit only an object having a predetermined priority or more according to a channel state. For example, if the channel condition deteriorates, the P frame is discarded and I and B frames are selectively transmitted. Here, the channel state represents a radio channel state between the BSR 12 and the user terminal 14.

7 is a flowchart illustrating an object-based multimedia data receiving method according to the present invention, in which the "user terminal 14" receives multimedia data (downward data) transmitted by the BSR 12 and "BSR". 12) is equally applicable when receiving the multimedia data (upload data) transmitted by the user terminal 14. Hereinafter, a case in which the "user terminal 14" is received will be described.

The user terminal 14 analyzes the multimedia packet received from the BSR 12 and checks the priority of the object (700).

As a result of the check, if the priority of the object is greater than or equal to a predetermined reference value (702), the transport layer transmits a reception complete response signal (ACK) to the transmission side (BSR) (704). At this time, if there are a plurality of reception completion response signals (ACK), the transmission is distributed through each beam of the MIMO antenna. On the other hand, if the priority of the object is lower than the predetermined reference value, it ends without sending a reception complete response signal (ACK).

MPEG-4 encoded packets are generally transmitted in UDP or RTP protocol. In general, the client sends an ACK to the server even if the client normally receives packets streamed by the video streaming server via UDP or RTP. In addition, even if a packet is normally received at the transport layer, the ACK is not sent.

However, in the present invention, only packets having a high priority are selected among the packets received after being encoded based on MPEG-4 and object, and an ACK is transmitted by the transport layer.

Hereinafter, a method of controlling the generation amount of the reception completion response signal ACK will be described.

When the BSR 12 simultaneously provides video streaming service to multiple user terminals, the amount of ACK notified on the uplink may be large. Through scheduling, when determining the order in which user terminals are to be fed back uplink, it is possible to consider the amount of ACK that each user terminal has already transmitted. In this case, the larger the amount of transmission of the ACK, the more opportunities for feedback can be given.

Alternatively, the generation amount of the ACK can be controlled based on the service charging policy. When providing a video to the premium user, the right to send feedback to the ACK for each screen object.

When the ACK is sent in the transport layer, it is possible to reduce the time required to feed back the ACK by distributing it to each stream of the MIMO antenna. For example, if the user terminal needs to send four ACKs to the BSR for feedback, the antenna repeatedly transmits four times with one antenna, whereas transmitting two times with two antennas twice transmits the ACK in half. Can be reduced.

On the other hand, the method of the present invention as described above can be written in a computer program. And the code and code segments constituting the program can be easily inferred by a computer programmer in the art. In addition, the written program is stored in a computer-readable recording medium (information storage medium), and read and executed by a computer to implement the method of the present invention. The recording medium may include any type of computer readable recording medium.

The present invention described above is capable of various substitutions, modifications, and changes without departing from the technical spirit of the present invention for those skilled in the art to which the present invention pertains. It is not limited by the drawings.

1 is an overall explanatory diagram of object-based multimedia data transmission / reception using priority according to the present invention;

2 is a diagram illustrating an embodiment of multimedia data transmission between a streaming server and a BSR according to the present invention;

3 is a detailed configuration diagram of an embodiment of a BSR according to the present invention;

4 is a configuration diagram of a BSR transmission and reception control unit;

5 is a flowchart illustrating an object-based multimedia data transmission method applied to a streaming server according to the present invention;

6 is a flowchart illustrating an object-based multimedia data downlink transmission method applied to a BSR having a MIMO antenna according to the present invention;

7 is a flowchart illustrating an embodiment of a method for receiving object-based multimedia data according to the present invention.

Claims (10)

In the object-based multimedia data transmission method applied to a streaming server, Separating one image frame into a plurality of objects; Assigning priority to each of the separated objects according to importance; And Selecting and transmitting an object having a predetermined priority or more according to the channel state Object-based multimedia data transmission method comprising a. The method of claim 1, And when the channel condition deteriorates, discarding the P frame and selecting and transmitting the I frame and the B frame. The method of claim 1, The channel state is Object-based multimedia data transmission method characterized in that the "wireless channel state between the radio access device and the user terminal" transmitted from a radio access device. In the object-based multimedia data downlink transmission method applied to a wireless access device having a MIMO antenna, A priority checking step of analyzing the multimedia packet received from the streaming server to check the priority of the corresponding object; And The higher priority of the identified object is transmitted to the user terminal through a beam having a higher gain in the MIMO antenna. Transmitting step repeatedly transmitted a predetermined number of times until Object-based multimedia data downlink transmission method comprising a. The method of claim 4, wherein The transmitting step, Selecting and transmitting an object having a predetermined priority or more according to the channel state Object-based multimedia data downlink transmission method further comprising. The method of claim 5, wherein And if the channel condition deteriorates, discarding the P frame and selecting and transmitting the I frame and the B frame. The method of claim 5, wherein The channel state is The object-based multimedia data downlink transmission method characterized in that the radio channel state between the radio access device and the user terminal. In the object-based multimedia data receiving method, A priority checking step of analyzing the received multimedia packet and checking the priority of the corresponding object; And A reception response step of transmitting a reception complete response signal (ACK) to the transmitter for the object having the checked priority level equal to or greater than a predetermined reference value. Object-based multimedia data receiving method comprising a. The method of claim 8, The reception response step, The object-based multimedia data receiving method characterized in that for transmitting the reception complete response signal (ACK) in the transport layer. The method of claim 8, The reception response step, When the reception completion response signal (ACK) is a plurality, the object-based multimedia data receiving method characterized in that the distributed transmission through each beam of the MIMO antenna.
KR1020080063226A 2008-06-30 2008-06-30 Method for transmitting/receiving multimedia data based on object using priority KR20100003114A (en)

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