KR20140003338A - Apparatus and method for transmitting/receiving data in communication system - Google Patents

Abstract

The present invention relates to an apparatus and a method for transmitting or receiving data normally by restoring the loss of data packets to improve multimedia service quality in a wireless communication based all-internet protocol (IP) network. The apparatus receives the access information of connected network systems which a terminal accesses; dynamically generates data packets in response to the access of the terminal to the network systems after confirming the access information; transmits the data packet to a receiver; generates the data packet including successive sequence frames when the terminal connects to a first system; and generates the data packet including a main frame including the sequence frames, a redundancy frame in which the sequence frames are delayed, and an exclusive OR (XOR) frame of the main frame when the terminal connects to the second system. [Reference numerals] (102) Terminal 1; (122) Terminal 2

Description

Apparatus and method for transmitting / receiving data in communication system

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a communication system, and in particular, to recover multimedia packet loss in order to improve multimedia service quality in an all-Internet protocol (IP: Internet protocol) based wireless communication. An apparatus and method for transmitting and receiving data.

In the current communication system, active researches are being conducted to provide users with services of various quality of service (QoS) having a high transmission speed (hereinafter referred to as 'QoS'). In particular, the communication system includes, for example, a wireless local area network (WLAN) system and a mobile communication technology, and with the advent of smart phones. Various multimedia services such as voice, video, and video can be provided.

In addition, as described above, in a communication system that provides a multimedia service through a terminal, various real-time multimedia services are also possible due to the advancement of the network, for example, the expansion of the bandwidth of the network, the improvement of the transmission speed of the network, and the improvement of the terminal performance. However, in spite of the increase of the number of users who want to receive multimedia service and the increase of data volume due to the high quality of voice and video data, the delay of transmission data is still due to the advanced network due to the inherent cause of the IP network which does not guarantee QoS. The loss is occurring.

In addition, the delay and loss in the real-time multimedia service causes the service quality deterioration for the user who wants to receive the multimedia service. In particular, various methods for minimizing data loss, which are the biggest factors of such service quality degradation, have been proposed. For example, a loss recovery method using a forward error correction code, a transmission control method using quality or loss feedback, a congestion avoidance method, etc. This has been proposed. However, these proposed schemes have limitations in data recovery performance and speed in recovering lost data, especially in a communication system that transmits and receives a large amount of data to provide a multimedia service.

Accordingly, in order to improve the quality of multimedia services in a communication system providing a multimedia service, a method of recovering lost data and transmitting and receiving data at high speed and normality is needed, and the terminal is connected to heterogeneous networks or heterogeneous systems in a communication system. There is a need for a method of efficiently transmitting and receiving data by recovering lost data when a multimedia service is provided.

Accordingly, it is an object of the present invention to provide an apparatus and a method for transmitting and receiving data in a communication system.

In addition, another object of the present invention is to provide an apparatus and method for transmitting and receiving data at high speed and normally by recovering loss of data packets in order to improve the quality of multimedia services in a communication system.

Another object of the present invention is to provide a data transmission / reception apparatus for efficiently recovering data packets lost when a terminal is connected to heterogeneous networks or heterogeneous systems in a communication system to receive a multimedia service, and to improve data transmission and reception efficiency. In providing a method.

In addition, another object of the present invention, when a terminal is connected to heterogeneous networks or heterogeneous systems in a communication system to perform a multimedia communication, the terminal itself is lost during multimedia communication by transmitting and receiving network information of the connected network The present invention provides a data transmitting / receiving apparatus and method for adaptively recovering data packets according to the access network to improve recovery performance of lost data packets.

An apparatus of the present invention for achieving the above object, the apparatus for transmitting data in a communication system, comprising: a receiving unit for receiving connection information of network systems to which the terminal is connected; A packet generation unit that checks the access information and generates a data packet having a first structure when the terminal accesses the first system and generates a data packet having a second structure when the terminal accesses the second system; And a transmitter for transmitting the data packets to a receiver; The data packet of the first structure comprises sequentially consecutive sequence frames; The data packet of the second structure includes a main frame including the sequence frames, a redundancy frame in which the sequence frames are delayed in sequence, and an exclusive OR frame of the main frame. .

According to another aspect of the present invention, there is provided an apparatus for receiving data in a communication system, the apparatus comprising: a receiving unit receiving a data packet generated from a transmitter corresponding to network systems to which a terminal is connected; A confirmation unit for confirming control information included in a header of the data packet and information on a plurality of frames included in a payload of the data packet; A decoder for decoding a plurality of frames included in the payload; And a reconstruction unit for reconstructing data transmitted by the transmitter through the decoded plurality of frames; The receiving unit, when the terminal accesses the first system, receives the data packet including sequence frames that are consecutively sequentially; When the terminal accesses the second system, a main frame including the sequence frames, a redundancy frame in which the sequence frames are delayed in sequence, and an exclusive OR frame of the main frame are included. The received data packet.

According to an aspect of the present invention, there is provided a method of transmitting and receiving data in a communication system, the method comprising: receiving connection information of network systems to which a terminal is connected; After generating the connection information, dynamically generating a data packet corresponding to a connection of the terminal to the network systems; And transmitting the data packet to a receiver; The generating may include generating, by the terminal, the data packet including successive sequence frames when the terminal accesses the first system; When the terminal accesses the second system, a main frame including the sequence frames, a redundancy frame in which the sequence frames are delayed in sequence, and an exclusive OR frame of the main frame are included. The generated data packet.

According to the present invention, when a terminal accesses heterogeneous networks or heterogeneous systems and receives a multimedia service, the present invention recovers a packet that is dynamically lost corresponding to the heterogeneous networks or heterogeneous systems, thereby providing the heterogeneous networks or heterogeneous systems. When providing a multimedia service to the terminal through the above, it is possible to efficiently recover the lost data packet to improve the transmission and reception of data.

In addition, the present invention recovers the loss of the data packet by adding redundancy data to the main data in a manner that does not require the recovery delay time of the lost data packet of the multimedia service in the communication system, By recovering the random or burst packet loss that can occur through wired or wireless network in real time without retransmission, the quality of the media can be improved by reducing the delay and loss in media playback.

1 schematically shows a structure of a communication system according to an embodiment of the present invention;
2 and 4 schematically illustrate a data packet structure in a communication system according to an embodiment of the present invention.
3 and 5 schematically illustrate the structure of a frame of a data packet in a communication system according to an embodiment of the present invention.
6 is a diagram schematically illustrating a structure of a transmitting device in a communication system according to an embodiment of the present invention.
7 is a view schematically showing the structure of a receiving device in a communication system according to an embodiment of the present invention.
8 is a diagram schematically illustrating a process of transmitting a data packet by a transmitter in a communication system according to an exemplary embodiment of the present invention.
9 is a diagram schematically illustrating a process of receiving a data packet by a receiving device in a communication system according to an exemplary embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the following description, only parts necessary for understanding the operation according to the present invention will be described, and the description of other parts will be omitted so as not to disturb the gist of the present invention.

The present invention proposes an apparatus and method for transmitting and receiving data in a communication system, such as a communication system providing a multimedia service. Here, in the embodiment of the present invention, a communication system including a wireless communication-based All-Internet Protocol (IP) network, for example, a wireless local area network (WLAN) Although a system or a mobile communication network system is described as an example, the data transmission / reception scheme proposed in the present invention may be applied to other communication systems.

In addition, according to an embodiment of the present invention, when a terminal receives a multimedia service by accessing a heterogeneous networks or heterogeneous systems, for example, a mobile communication network system to a WLAN system or a second system to a first system, According to the heterogeneous networks or heterogeneous systems connected, the data packet is dynamically generated and transmitted and received, and adaptively recovers the lost data packet during transmission and reception of the data packet, thereby recovering the lost data packet. Improve the transmission and reception efficiency. In other words, according to an embodiment of the present invention, a data packet is dynamically generated and transmitted in a different manner according to heterogeneous networks or heterogeneous systems to which the terminal is connected, and the data packet lost when transmitting and receiving the data packet is adapted. In other words, the lost data packet is recovered by applying different packet loss recovery schemes according to heterogeneous networks or heterogeneous systems to which the terminal is connected.

Here, in an embodiment of the present invention, when the terminal accesses a WLAN system and receives a multimedia service, an access point (AP) of the WLAN system is referred to as an 'AP'. In response to the connection of the terminal to the WLAN system, a frame including data corresponding to the multimedia service is transmitted and received in one data packet. Particularly, in an embodiment of the present invention, a sequence packet of data corresponding to the multimedia service and one data packet including the sequence frames are generated, and a call for accessing the terminal to the WLAN system is generated. In setting, after checking the access information of the terminal to the WLAN system and the data packet reception information of the terminal to access the WLAN system and receive the data packet, the sequence frame and the sequence frame including the sequence frame Generate and send data packets.

In addition, in an embodiment of the present invention, when the terminal accesses a mobile communication network system and receives a multimedia service, the terminal and a base station (BS) of the mobile communication network system will be referred to as a BS. ) Transmits / receives a plurality of frames including data corresponding to the multimedia service in one data packet corresponding to a connection of the terminal to the mobile communication network system. Particularly, in an embodiment of the present invention, a main frame of data corresponding to the multimedia service and a redundancy frame of the main frame are transmitted and received in one data packet, wherein the mobile communication of the terminal is performed. When setting up a call for access to a network system, after confirming connection information of the terminal to the mobile communication network system, and data packet reception information of the terminal to connect to the mobile communication network system and receive a data packet, Generate an exclusive logical OR (XOR: XOR) frame of the mail frame and the redundancy frame and the main frame, wherein the main frame, the frame, and the XOR frame are one data packet. Create and send with.

In addition, in the embodiment of the present invention, when the communication system provides a real-time multimedia service, as described above, by recovering the loss of the data packet generated during the transmission and reception of the real-time multimedia service data, and transmitting and receiving large-capacity data at high speed and normal In this case, a plurality of frames including data corresponding to the real-time multimedia service are transmitted and received in one data packet, for example, a Real-time Transport Protocol (RTP) packet. That is, in an embodiment of the present invention, corresponding to heterogeneous networks or heterogeneous systems to which a terminal is connected, dynamically generate a frame of data corresponding to the real-time multimedia service, for example, generate sequence frames of the data, or main After generating the frame, the redundancy frame and the XOR frame, one RTP packet including the generated sequence frames or one RTP packet including the generated main frame and the redundancy frame and the XOR frame are generated and transmitted. Hereinafter, the communication system according to the embodiment of the present invention will be described in more detail with reference to FIG.

1 is a diagram schematically showing a structure of a communication system according to an embodiment of the present invention.

Referring to FIG. 1, in the communication system, terminals to which a multimedia service is to be provided, for example, terminal 1 102 and terminal 2 122, and the terminals 102. 122 are connected to the terminals 102 and 122. Transmitting and receiving data packets corresponding to the multimedia service to WLAN systems 108 and 114 and 3G / 4G systems 110 and 116 of the mobile communication network system and the terminals 102 and 122 to heterogeneous networks or heterogeneous systems providing a service. Between the APs 104 and 118 of the WLAN systems 108 and 114 and the BSs 106 and 120 of the 3G / 4G systems 110 and 116, and between the WLAN systems 108 and 114 and the 3G / 4G systems 110 and 116. Internet / IP network 112 to connect to.

Here, in the communication system, as described above, when the terminals 102 and 122 access the WLAN systems 108 and 114 or the 3G / 4G systems 110 and 116 in order to receive a multimedia service, the terminals Corresponding to the connection information of the 102 (122, 122) to the WLAN systems 108, 114 or the 3G / 4G systems (110, 116), generates a data packet including a frame of data corresponding to the multimedia service and the frame of data; The terminal 102 and 122 and the APs 104 and 118 or the BSs 106 and 120 transmit and receive the data packet.

For example, when the terminals 102 and 122 are connected to the WLAN systems 108 and 114 to receive the multimedia service, one data packet including the sequence frames of the data corresponding to the multimedia service and the sequence frames. Generates and transmits and receives the data packet between the terminals 102 and 122 and the APs 104 and 118. When the terminals 102 and 122 are connected to the 3G / 4G systems 110 and 116 to receive the multimedia service, after generating the main frame and the redundancy frame and the XOR frame of the data corresponding to the multimedia service, And generating one data packet including the main frame, the redundancy frame, and the XOR frame, and transmitting and receiving the data packet between the terminals 102 and 122 and the BSs 106 and 120. Next, the data packet transmitted and received by the data transceiving device in the communication system according to an exemplary embodiment of the present invention will be described in more detail with reference to FIG. 2.

2 is a diagram schematically illustrating a data packet structure in a communication system according to an exemplary embodiment of the present invention. 2 is a diagram schematically illustrating a structure of an RTP packet including sequence frames of data corresponding to a real-time multimedia service, as described above.

Referring to FIG. 2, the data packet includes a header 200 including control information about the data packet, and a payload 250 including data corresponding to a multimedia service. do. Here, in the header 200 of the data packet, when the receiving device receives the data packet, all the control information necessary for the data recovery of the multimedia service included in the payload 250 of the data packet is received by the receiving device. Included.

In addition, the payload 250 of the data packet, as described above, when the terminal accesses the 3G / 4G system through the mobile communication network system to receive the multimedia service, the call setup to the 3G / 4G system The data frame includes the data frame such that a data frame including data corresponding to the multimedia service is transmitted and received in one data packet, corresponding to the access information of the terminal to the 3G / 4G system. That is, the payload 250 of the data packet includes a sequence frame 260 as a data frame including data corresponding to the multimedia service. In addition, the payload 250 of the data packet includes a mode field 255 including information of frames included in the payload 250 of the data packet. That is, the mode field 255 indicates information indicating the number of frames included in the payload 250 as field information and the inclusion of the sequence frame 260 in the payload 250 of the data packet. Information is included.

For example, the transmitting device for transmitting the data packet receives the connection information from the receiving device, checks the connection information to generate the sequence frame 260, and then transmits the sequence frame to the payload 250. 260, and includes information on the sequence frame 260 included in the payload 250, for example, information on the number of the sequence frames 260, in the mode field 255.

Here, the connection information is transmitted to the transmitting device at the time of call setup when the terminal connects to the 3G / 4G system through the mobile communication network system. When the receiving device receives a data packet from the transmitting device, the receiving device transmits data packet reception information for receiving the data packet to the transmitting device, wherein the data packet receiving information is a data packet received at the receiving device. Data packet loss information of the receiving device, i.e., a loss ratio, of the receiving device, and included in the mode field 255 when the receiving device transmits the data packet as shown in FIG. 2 to the transmitting device. And is transmitted to the transmitting device. That is, the mode field 255 transmits a data packet including the mode field 255 as well as information on the number of sequence frames included in the payload 250 as described above. When the transmitting device receives the data packet from the receiving device, the transmitting device includes data packet reception information received from the receiving device, that is, loss information.

In addition, the receiving apparatus confirms the control information included in the header 200 of the data packet, and restores data corresponding to the multimedia service included in the payload 250, wherein the header 200 The size of the payload 250 is checked through the check, and the number of sequence frames included in the payload 250 is checked through the mode field 255. Therefore, the receiving apparatus confirms the length of the sequence frame 260 included in the payload 250 through the size of the payload 250 and the number of the sequence frames. The receiving device that has received the data packet in this way, like the transmitting device, includes a plurality of frames including data to be transmitted to the transmitting device in the payload 250 and transmits it as one data packet. The number field information of the sequence frames included in 250 and the data packet reception information, that is, the loss information, are included in the mode field 255 and transmitted by the receiving apparatus. Next, the sequence frame included in the payload of the data packet transmitted and received by the data transmission / reception apparatus in the communication system according to the embodiment of the present invention will be described in more detail with reference to FIG. 3.

3 is a diagram schematically illustrating a structure of a frame of a data packet in a communication system according to an exemplary embodiment of the present invention. 3 is a diagram schematically illustrating a structure of a sequence frame included in a payload of a data packet.

Referring to FIG. 3, when a terminal accesses a 3G / 4G system to a mobile communication network system and receives a multimedia service, the transmitting device has a sequence number of data corresponding to the multimedia service. A plurality of sequence frames are generated, and a plurality of sequence frames including data corresponding to the multimedia service are configured and transmitted as one data packet.

In more detail, the sequence frame 300 included in the data packet includes a plurality of sequence frames having arbitrary n sequence numbers, for example, n sequence frame 302 and n-1 sequence frame 304. , n-2 sequence frame 306, n-3 sequence frame 308,... , n-w sequence frame 310.

Here, n (= 1, 2, 3, ... integer) is sequentially generated for the real-time multimedia service when the terminal of the communication system is connected to the 3G / 4G system by the mobile communication network system to receive the multimedia service The sequence number of the frame including the data, w (= 1, 2, 3, ... integer) is a sequence delay value for the plurality of sequence frames, the data packet at the receiving device received through the mode field It is determined according to the received information and is determined according to the loss rate of the data packet at the receiving device in order to improve the recovery performance of the lost data packet generated at the time of transmission and reception of the data packet.

In this manner, the transmitting apparatus in the communication system generates a plurality of sequence frames 302, 304, 306, 308, 310, that is, a sequence frame 300 of data corresponding to the multimedia service, and then transmits a data packet including the sequence frame 300. Generating and transmitting to the receiving device, wherein the receiving device decodes the data packet and recovers the lost data packet, that is, decodes the sequence frame 300 included in the payload of the data packet. In step 300, the lost sequence frame is recovered to restore data corresponding to the multimedia service. Next, the data packet transmitted and received by the data transceiver in the communication system according to an exemplary embodiment of the present invention will be described in more detail with reference to FIG. 4.

4 is a diagram illustrating a data packet structure in a communication system according to an embodiment of the present invention. 4 is a diagram schematically illustrating a structure of an RTP packet including a plurality of frames including data corresponding to a real-time multimedia service, as described above.

Referring to FIG. 4, the data packet includes a header 400 including control information about the data packet, and a payload 450 including data corresponding to a multimedia service. Here, in the header 400 of the data packet, when the reception apparatus receives the data packet, all control information necessary for the data recovery of the multimedia service included in the payload 450 of the data packet is received by the reception apparatus. Included.

In addition, the payload 450 of the data packet is, as described above, when the terminal accesses the WLAN system to receive the multimedia service, the WLAN of the terminal that is transmitted and received when establishing a call to the 3WLAN system. The data frame includes the data frame such that a data frame including data corresponding to the multimedia service is transmitted and received in one data packet corresponding to the access information to the system. Here, the payload 450 of the data packet includes a main frame 460 of data corresponding to the multimedia service, a redundancy frame 465 of the main frame 460, and data received from a receiving device. The XOR frame 470 of the main frame 460 is included according to the packet reception information. In addition, the payload 450 of the data packet includes a mode field 455 including information of frames included in the payload 450 of the data packet. That is, the mode field 455 includes information indicating the number of frames included in the payload 450 as field information and the main frame 460 and the redundancy frame in the payload 450 of the data packet. 465 and information indicating the inclusion of the XOR frame 470 is included.

For example, the transmitting device for transmitting the data packet receives the connection information from the receiving device, and then checks the connection information to generate the main frame 460, the redundancy frame 465, and the XOR frame 470. The payload 450 includes the main frame 460, the redundancy frame 465, and the XOR frame 470. Information about the frames 460, 465, and 470 included in the payload 450 is included. For example, the number field information of the frames 460, 465, and 470 is included in the mode field 455.

Here, the connection information is transmitted to the transmitting device at the time of call setup when the terminal connects to the WLAN system. When the receiving device receives a data packet from the transmitting device, the receiving device transmits data packet reception information for receiving the data packet to the transmitting device, wherein the data packet receiving information is a data packet received at the receiving device. Data packet loss information of the receiving device, i.e., a loss rate, for the receiving device to be included in the mode field 455 when the receiving device transmits the data packet as shown in FIG. Is sent. That is, the mode field 455 transmits a data packet including the mode field 455 as well as information on the number of frames included in the payload 450 as the field information. When the device receives a data packet from the receiving device, the device includes data packet reception information received from the receiving device, that is, loss information.

The transmitter checks the data packet reception information included in the mode field 455 of the data packet received from the receiver, and when the loss rate of the data packet is less than a threshold value in the receiver, the payload When the main frame 460 and the redundancy frame 465 are included in the 450 and the loss rate of the data packet in the receiving device is greater than a threshold value, the main frame 460 in the payload 450. The redundancy frame 465 and the XOR frame 470 are included and transmitted to the receiving device. In this case, the mode field 455 includes information on the number of frames included in the payload 450 and data packet reception information, that is, loss information, in the transmitting apparatus.

In addition, the receiving apparatus confirms control information included in the header 400 of the data packet, and restores data corresponding to the multimedia service included in the payload 450, wherein the header 400 The size of the payload 450 is checked through the check, and the number of frames included in the payload 450 is checked through the mode field 455. Therefore, the receiving apparatus checks the length of the frames included in the payload 450 through the size of the payload 450 and the number of frames. Here, the sizes of the frames included in the payload 450 are the same. The receiving device having received the data packet in this way, like the transmitting device, includes a plurality of frames including data to be transmitted to the transmitting device in the payload 450 and transmits it as one data packet, wherein the payload The information on the number of frames included in 450 and the data packet reception information, that is, the loss information, are included in the mode field 455 and transmitted by the receiving apparatus. Next, the plurality of frames included in the payload of the data packet transmitted and received by the data transceiving device in the communication system according to the embodiment of the present invention will be described in more detail with reference to FIG. 5.

5 is a diagram schematically illustrating a structure of frames of a data packet in a communication system according to an exemplary embodiment of the present invention. 5 is a diagram schematically illustrating the structure of a main frame, a redundancy frame, and an XOR frame included in a payload of a data packet.

Referring to FIG. 5, when the terminal accesses the WLAN system and receives the multimedia service, the transmitting device generates a frame having a sequence number of data corresponding to the multimedia service, that is, the The transmitting device generates a data packet frame having an n (= 7) th sequence number, for example, a voice frame or a video frame, and transmits a plurality of frames including data corresponding to the multimedia service as one data packet. do.

That is, as described above, in order for the terminal to access a WLAN system and receive a multimedia service, the transmitting apparatus may include a main frame 510, a redundancy frame 550, and an XOR frame (data) corresponding to the multimedia service. After generating 580, the data packet including the main frame 510, the redundancy frame 550, and the XOR frame 580 is transmitted to the data receiving apparatus. In this case, when the loss rate of the data packet is smaller than the threshold value, the receiving device includes the main frame 510 and the redundancy frame 550 in the payload of the data packet, and transmits the data packet as one data packet. If the loss rate of the data packet is greater than the threshold, the payload includes the main frame 510, the redundancy frame 550, and the XOR frame 580 and transmits the data packet as one data packet. The mode field of contains information on the number of frames included in the payload and data packet reception information, that is, loss information, in the transmitting apparatus.

In more detail, first, the main frame 510 includes a plurality of sequence frames having an arbitrary n (= 7) th sequence number. For example, the nw-3 (= 1) sequence frame 512, nw-2 (= 2) sequence frame 514, nw-1 (= 3) sequence frame 516, nw (= 4) sequence frame 518, n-2 (= 5) sequence frame 520, n-1 (= 6) sequence frame 522, n (= 7) sequence frame 524, n + 1 (= 8) sequence frame 526, n + 2 (= 9) sequence frame 528, And an n + 3 (= 10) sequence frame 530.

Herein, n (= 1, 2, 3, ... integer) is a sequence of frames including data sequentially generated for the real-time multimedia service when the terminal of the communication system connects to the WLAN system and receives the multimedia service. It means a number, in the embodiment of the present invention will be described assuming n = 7 for convenience of description.

And w (= 1, 2, 3, ... integer) is a sequence delay value between the main frame 210 and the redundancy frame 250, corresponding to the data packet reception information received by the receiving device received through the mode field In order to improve the recovery performance of the lost data packet generated at the time of transmission and reception of the data packet, it is determined according to the loss rate of the data packet at the receiving apparatus. For example, when the loss rate of the data packet is smaller than the threshold value at the receiving device, w is determined to be smaller than w determined at the time of transmitting and receiving the previous data packet, and when the loss rate of the data packet is larger than the threshold value at the receiving device, W is determined to be larger than w determined at the time of transmission and reception of the previous data packet.

Here, the w is transmitted to the receiving device through the mode field of the payload, and the receiving device, as described above, payload through the information included in the header of the data packet and the mode field of the payload. The size of the frame, the number of frames, and the length of the frames are checked. In particular, the starting point of each frame in the payload is detected through w to decode the frames. That is, the receiving apparatus, based on the size of the payload, the number of frames, the length of the frames, and w, the start point of the main frame, the start point of the redundancy frame, and the start point of the XOR frame in the payload of the data packet By recognizing this, the main frame, the redundancy frame, and the XOR frame are normally decoded to recover the lost data packet, and accordingly, the transmitting device normally recovers the data transmitted.

In addition, the redundancy frame 550 includes a plurality of sequence frames having a sequence delay, that is, w (= 3) of the main frame 510 having an arbitrary n (= 7) th sequence number. -3 (= 1) sequence frame 558, nw-2 (= 2) sequence frame 560, nw-1 (= 3) sequence frame 562, nw (= 4) sequence frame 564, n -2 (= 5) sequence frame 566, n-1 (= 6) sequence frame 568, n (= 7) sequence frame 570, nw-3 (in the main frame 510) = 1) null frames 552, 554, and 556 respectively corresponding to the sequence frame 512, the nw-2 (= 2) sequence frame 514, and the nw-1 (= 3) sequence frame 516. That is, since the redundancy frame 550 has a sequence delay of w (= 3), sequence frames of the main frame 510 exist after the w (= 3) sequence frame of the main frame 510.

The XOR frame 580 includes frames resulting from performing an XOR operation on the main frame 510 having an arbitrary n (= 7) th sequence number. For example, nw of the main frame 510 is included. An XOR1 frame 582 is a result of performing an XOR operation on the -3 (= 1) sequence frame 512, the nw-2 (= 2) sequence frame 514, and the nw-1 (= 3) sequence frame 516. XOR operation on the nw (= 4) sequence frame 518 and the n-2 (= 5) sequence frame 520 and the n-1 (= 6) sequence frame 522 of the main frame 510. The result frame includes the XOR2 frame 584.

Therefore, when the transmitting device transmits a data packet frame having an n (= 7) th sequence number, the payload of the data packet includes the n (= 7) sequence frame 524 of the main frame 510 and redundancy. The nw (= 4) sequence frame 564 of the frame 550 and the XOR1 frame 582 of the XOR frame 580 are included to form one data packet, wherein the three fields described above are included in the mode field of the payload. Information indicating that the frame is included in the payload, that is, information about the number of frames is included. Here, when the transmitter transmits the nth data packet frame, the main frame 510 of the n (= 7) sequence frame 524 and the redundancy frame 550 of the nw (= 4) sequence frame 564 are used. XOR of the nw-3 (= 1) sequence frame 512 and the nw-2 (= 2) sequence frame 514 and the nw-1 (= 3) sequence frame 516 of the main frame 510. As a result of the operation, that is, the XOR frame 580 of the XOR1 582 frame is generated and transmitted as one data packet.

Further, when the transmitting device transmits a data packet frame having an n + 1 (= 8) th sequence number, the n + 1 (= 8) sequence frame 526 of the main frame 510 is included in the payload of the data packet. ) And the n--2 (= 5) sequence frame 566 of the redundancy frame 550 to configure one data packet, wherein the two fields described above are included in the payload in the mode field of the payload. Information indicating the number of frames. Here, when the transmitter transmits the n + 1 th data packet frame, the main frame 510 of the n + 1 (= 8) sequence frame 526 and the n-2 (= 5) sequence frame 566 The redundancy frame 550 is generated as one data packet and transmitted.

When the transmitting device transmits a data packet frame having an n + 2 (= 9) th sequence number, the payload of the data packet includes an n + 2 (= 9) sequence frame 528 of the main frame 510. ) And the n--1 (= 6) sequence frame 568 of the redundancy frame 550 to configure one data packet, wherein the two fields described above are included in the payload in the mode field of the payload. Information indicating the number of frames. Here, when the transmitter transmits the n + 2 th data packet frame, the main frame 510 of the n + 2 (= 9) sequence frame 528 and the n-1 (= 6) sequence frame 568 The redundancy frame 550 is generated as one data packet and transmitted.

In addition, when the transmitter transmits a data packet frame having an n + 3 (= 10) th sequence number, the payload of the data packet includes an n + 3 (= 10) sequence frame 530 of the main frame 510. ), An n (= 7) sequence frame 570 of the redundancy frame 550, and an XOR2 frame 584 of the XOR frame 580 constitute a single data packet. Information indicating that the aforementioned three frames are included in the payload, that is, information on the number of frames is included. Here, when the transmitter transmits the n + 3 th data packet frame, the main frame 510 of the n + 3 (= 10) sequence frame 530 and the n (= 7) sequence frame 570 Redundancy frame 550, and nw (= 4) sequence frame 518 and n-2 (= 5) sequence frame 520 and n-1 (= 6) sequence frame 522 of the main frame 510. The result of performing the XOR operation, that is, the XOR frame 580 of the XOR2 (584) frame is generated as one data packet and transmitted.

In this way, the transmission apparatus includes a main frame 510 and a redundancy frame 550 in a payload to transmit a data packet, or an XOR frame as well as the main frame 510 and the redundancy frame 550 in the payload. When the data packet is transmitted by including 580, the receiving apparatus checks the frames included in the payload and receives data corresponding to the multimedia service transmitted by the transmitting apparatus. As described above, the receiving apparatus confirms the control information on the payload through the header of the data packet, and also checks the number of frames included in the mode field of the payload.

In addition, the receiving apparatus decodes the main frame 510 included in the payload to restore the data transmitted by the transmitting apparatus. In this case, when a predetermined sequence frame is lost in the decoded main frame, the loss is performed. The recovered sequence frame, that is, the lost data packet, through the redundancy frame 550 to restore the data transmitted by the transmitting apparatus. When the sequence frame lost in the main frame 510 is also lost in the redundancy frame 550, the receiving device XORs the sequence frames lost in the main frame 510 and the redundancy frame 550. The frame 580 recovers the data transmitted by the transmitting apparatus.

For example, in more detail, the receiving apparatus decodes the main frame 510 included in the payload to restore data transmitted by the transmitting apparatus, and thus, nw-3 of the main frame 510. (= 1) When the sequence frame 212 is lost, the redundancy frame 550 is decoded to check the nw-3 (= 1) sequence frame 512 of the redundancy frame 550, and the redundancy frame ( Nw-3 (= 1) sequence frame 512 of 550 recovers the lost nw-3 (= 1) sequence frame 512 of main frame 510 to restore the data transmitted by the transmitting device. do. In this case, when not only the nw-3 (= 1) sequence frame 512 of the main frame 510 but also the nw-3 (= 1) sequence frame 512 of the redundancy frame 550 are also lost, the XOR Decode frame 580 to identify XOR1 frame 582 of XOR frame 580, and nw-3 (= 1) sequence frame 512 and nw-2 (= 2) of main frame 510. Nw-3 (= 1) sequence of the lost main frame 510 through XOR1 frame 582, which is the result of performing the XOR operation on sequence frame 514 and nw-1 (= 3) sequence frame 516 The frame 512 is recovered to restore the data transmitted by the transmitting apparatus. Here, the nw-3 (= 1) sequence frame 512 of the lost main frame 510 includes the nw-2 (= 2) sequence frame 514 and nw-1 (=) of the main frame 510. 3) XOR operation is performed on the sequence frame 516 and the XOR1 frame 582 to recover the nw-3 (= 1) sequence frame 512 of the lost main frame 510.

In addition, the decoded main frame 510 is input to a jitter buffer of a restoration unit included in a receiving device, and the decoded redundancy frame 550 and the decoded XOR frame 580 are recovery of the restoration unit. A sequence frame entered in a recovery buffer and lost in the decoded main frame 510 as described above is recovered through the decoded redundancy frame 550 or the decoded XOR frame 580, and The transmission data contained in the payload is normally restored. And, the receiving apparatus is included in the payload of the data packet for transmitting the data packet reception information corresponding to the loss of the data packet and the recovery of the lost data packet, that is, the loss information of the data packet, as described above. It is included in the mode field and transmitted to the transmitter. Next, the apparatus for transmitting the data packet as described above in the communication system according to an exemplary embodiment of the present invention will be described in more detail with reference to FIG. 6.

6 is a diagram schematically illustrating a structure of a transmitting device in a communication system according to an embodiment of the present invention. Here, FIG. 6 is a diagram illustrating the heterogeneous networks or heterogeneous systems when the terminal is provided with multimedia service by accessing heterogeneous networks or heterogeneous systems, that is, a WLAN system or a mobile communication network system, as described with reference to FIGS. 2 to 5. Correspondingly, the apparatus for generating and transmitting frames of data corresponding to the multimedia service dynamically and one data packet including the frames is schematically illustrated.

Referring to FIG. 6, the transmitting apparatus 600 receives connection information of the terminal from a WLAN system or a mobile communication network system, data packets transmitted by a receiving apparatus, and data packet receiving information from the receiving apparatus. A frame generator 620 for dynamically generating a plurality of frames included in a payload of a data packet corresponding to a connection to the WLAN system or a mobile communication network system after checking the connection information; A packet generator 630 for generating one data packet by including the generated plurality of frames in a payload, and a transmitter 640 for transmitting the generated data packet to the receiving device.

More specifically, the receiving unit 610, when the terminal is connected to the WLAN system or the mobile communication network system to establish a call to receive the multimedia service, the WLAN system or mobile communication network system of the terminal Receive connection information. In addition, the receiving unit 610 receives the data packet from the receiving device, and also through the mode field included in the payload of the received data packet, the data packet reception information at the receiving device, that is, the loss of the data packet Receive information.

The frame generator 320 generates a plurality of frames including data to be transmitted to the receiving apparatus, that is, data corresponding to a multimedia service, and at this time, the terminal to the WLAN system or the mobile communication network system. Corresponding to the connection, dynamically generate frames of data corresponding to the multimedia service. In more detail, as described above, the frame generation unit 320 generates the sequence frames of the data when the terminal is connected to the WLAN system, and when the terminal is connected to the mobile communication network system. Determine the number and w of frames in consideration of the loss information of the data packet in the receiving device, and generate a main frame and a redundancy frame according to the number and w of the frames determined in this way, or the main frame and the redundancy frame In addition, it generates an XOR frame.

In addition, the packet generator 630 generates a data packet by including a plurality of frames generated by the frame generator 620 in a payload, wherein the payload is included in the payload in a mode field of the payload. Include information about the frames, in particular information indicating the number of the frames. Here, the payload of the data packet includes sequence frames or the main frame, the redundancy frame, and the XOR frame, corresponding to the connection of the terminal to the WLAN system or the mobile communication network system. The main frame and the redundancy frame may be included according to the loss information of the data packet in the receiving device.

In addition, the transmitter 640 transmits the data packet generated by the packet generator 630 to the receiver. Here, in response to the connection of the terminal to the WLAN system or the mobile communication network system, dynamic generation of frames containing data corresponding to the multimedia service, and generation of a data packet including the frames, and the data packet Since the structure and the structure of the frame has been described in detail above, a detailed description thereof will be omitted. Next, the apparatus for receiving the data packet as described above in the communication system according to an exemplary embodiment of the present invention will be described in more detail with reference to FIG. 7.

7 is a diagram schematically illustrating a structure of a receiving device in a communication system according to an embodiment of the present invention. Here, FIG. 7 is a diagram illustrating the heterogeneous networks or heterogeneous systems such that the terminal is connected to heterogeneous networks or heterogeneous systems, that is, a WLAN system or a mobile communication network system to receive a multimedia service. Correspondingly, when a frame of data corresponding to a multimedia service and a data packet including the frames are generated and transmitted correspondingly, the apparatus for receiving the data packet is schematically illustrated.

Referring to FIG. 7, the receiving apparatus 700 includes a receiving unit 710 for receiving a data packet transmitted by a transmitting apparatus, control information included in a header of the received data packet, and a payload of the received data packet. A verification unit 720 confirming field information included in a mode field of the decoder, a decoder 730 for decoding a plurality of frames included in the payload, and recovering a frame lost in the decoded frames, A restoration unit 740 for restoring the transmitted data, and data packet reception information corresponding to the lost frame, that is, loss information of the data packet, to the transmitting apparatus, and the terminal transmits the WLAN system or the mobile communication network system. When the call is set up to access the multimedia service by accessing the mobile station, the access information of the terminal to the WLAN system or the mobile communication network system is stored. And a transmission section 750 for transmitting to the transmitting device.

More specifically, as described with reference to FIG. 6, the receiver 710 receives a data packet transmitted by the transmitter. That is, the reception unit 710 receives a data packet including data corresponding to the multimedia service, in response to a connection of the terminal to the WLAN system or a mobile communication network system, and the data packet includes a header and a pay page. A load is included, and the payload includes a mode field and a plurality of frames including the data.

The verification unit 720 confirms control information included in the header, and also includes field information included in a mode field of the payload, that is, information on a plurality of frames included in the payload. For example, information indicating the number of frames is checked. In other words, the identification unit 720 may determine the size of the payload, the number of frames, the length of the frames, and the payload based on information included in the header and information included in the mode field. Check the starting point of the frames. That is, the identification unit 720 may include sequence frames in the payload, main frame, redundancy frame, and XOR frame in the payload, corresponding to the connection of the terminal to the WLAN system or the mobile communication network system. Check for inclusion.

In addition, the decoder 730 decodes the frames included in the payload based on the information confirmed by the identification unit 720. Here, as described above, the decoder 730 decodes the sequence frames included in the payload, or after decoding the main frame from the frames included in the payload, and then loses the decoded main frame. Decoded redundancy frames if there is a sequence frame present, and the decoded redundancy frames also decode XOR frames if sequence frames are lost. The decoded frames are input to the jitter buffer and the recovery buffer of the recovery unit 740.

In addition, the restoration unit 740 restores sequence frames lost from the sequence frames, and restores data transmitted from the transmission apparatus, that is, data corresponding to the multimedia service. In addition, the reconstructor 740 checks the sequence frame lost in the decoded main frame and, if the lost sequence frame exists, converts the sequence frame corresponding to the lost sequence frame from the decoded redundancy frame. Recover the lost sequence frame, and if the lost sequence frame is also lost in the decoded redundancy frame, recovers the lost sequence frame through the XOR frame, thereby recovering the data transmitted from the transmitting apparatus, that is, the multimedia service. Restore the corresponding data.

The transmitting unit 750 transmits a data packet that the receiving device 700 transmits to the transmitting device. In this case, the transmitting unit 750 transmits a data packet to the mode field of the payload of the transmitted data packet. Data packet reception information, that is, data packet loss in the reception apparatus 700 as described above and data loss information corresponding to the recovery of the lost data packet are included and transmitted to the transmission apparatus. Herein, corresponding to the connection of the terminal to the WLAN system or the mobile communication network system, frames included in the payload of the data packet and the structure of the data packet received from the transmitting apparatus, that is, the sequence frames, or Since the structure of the main frame and the redundancy frame as well as the XOR frame has been described above in detail, detailed description thereof will be omitted herein. Next, an operation of transmitting the data packet as described above in the communication system according to an exemplary embodiment of the present invention will be described in more detail with reference to FIG. 8. 8 is a diagram schematically illustrating a process of transmitting a data packet by a transmitting device in a communication system according to an exemplary embodiment of the present invention.

Referring to FIG. 8, in step 810, the transmitting apparatus, when a terminal establishes a call for receiving a multimedia service by accessing heterogeneous networks or heterogeneous systems, that is, a WLAN system or a mobile communication network system, Confirm the connection information to the WLAN system or the mobile communication network system. The transmitting apparatus confirms the data packet received from the receiving apparatus and the data packet receiving information at the receiving apparatus, and checks the data packet at the receiving apparatus through a mode field included in the payload of the data packet received from the receiving apparatus. Check the data packet reception information, that is, the loss information of the data packet.

Next, in step 820, in response to the connection of the terminal to the WLAN system or the mobile communication network system, a plurality of frames including data to be transmitted to the receiving device, that is, data corresponding to the multimedia service is dynamically generated. do. Here, when the terminal connects to the WLAN system, sequence frames of the data are generated, and when the terminal accesses the mobile communication network system, the number of frames and Determine w and generate a main frame and a redundancy frame according to the number and w of the frames thus determined, or generate an XOR frame as well as the main frame and the redundancy frame.

In operation 830, a data packet is generated by including the generated plurality of frames in a payload, wherein information about the frames included in the payload, in particular, the number of the frames, is included in a mode field of the payload. Include indicative information. Here, the payload of the data packet includes sequence frames or the main frame, the redundancy frame, and the XOR frame, corresponding to the connection of the terminal to the WLAN system or the mobile communication network system. The main frame and the redundancy frame may be included according to the loss information of the data packet in the receiving device.

Then, in step 840, the generated data packet is transmitted to the receiving device. Here, in response to the connection of the terminal to the WLAN system or the mobile communication network system, dynamic generation of frames containing data corresponding to the multimedia service, and generation of a data packet including the frames, and the data packet Since the structure and the structure of the frame has been described in detail above, a detailed description thereof will be omitted. Next, an operation of receiving the data packet as described above in the communication system according to an exemplary embodiment of the present invention will be described in more detail with reference to FIG. 9.

9 is a diagram schematically illustrating a process of receiving a data packet by a receiving device in a communication system according to an exemplary embodiment of the present invention.

Referring to FIG. 9, in step 910, the receiving device receives a data packet transmitted by a transmitting device, that is, a data packet including data corresponding to a multimedia service. Here, the receiving device corresponds to the connection of the terminal to the WLAN system or the mobile communication network system so that the terminal is connected to the heterogeneous networks or heterogeneous systems, that is, the WLAN system or the mobile communication network system to receive a multimedia service. Thus, a data packet including data corresponding to the multimedia service is received, the data packet includes a header and a payload, and the payload includes a mode field and a plurality of frames including the data.

Next, in step 920, the control information included in the header is checked, and the field information included in the mode field of the payload, that is, information about a plurality of frames included in the payload, for example, a frame Check the information indicating the number of them. In other words, the size of the payload, the number of frames, the length of the frames, and the starting point of the frames in the payload are identified through the information included in the header and the information included in the mode field. That is, corresponding to the connection of the terminal to the WLAN system or the mobile communication network system, the inclusion of the sequence frames in the payload, or the inclusion of the main frame, redundancy frame and XOR frame in the payload.

In operation 930, the frames included in the payload are decoded based on the identified information. Here, after decoding the sequence frames included in the payload, or after decoding the main frame from the frames included in the payload, and if there is a lost sequence frame in the decoded main frame, redundancy frame, The decoded redundancy frame also decodes an XOR frame if a sequence frame is lost.

Then, in step 940, the sequence frames lost in the sequence preparations are recovered to restore data transmitted by the transmitting apparatus, that is, data corresponding to the multimedia service. The method may further identify a lost sequence frame in the decoded main frame, and recover the lost sequence frame from the decoded redundancy frame to a sequence frame corresponding to the lost sequence frame if the lost sequence frame exists. When the lost sequence frame is also lost in the decoded redundancy frame, the lost sequence frame is recovered through the XOR frame to restore data transmitted by the transmitting apparatus, that is, data corresponding to the multimedia service. Herein, corresponding to the connection of the terminal to the WLAN system or the mobile communication network system, frames included in the payload of the data packet and the structure of the data packet received from the transmitting apparatus, that is, the sequence frames, or Since the structure of the main frame and the redundancy frame as well as the XOR frame has been described above in detail, detailed description thereof will be omitted herein.

As described above, in the communication system according to the embodiment of the present invention, when the terminal is connected to heterogeneous networks or heterogeneous systems, that is, a WLAN system or a mobile communication network system and receives a multimedia service, the heterogeneous networks or heterogeneous networks are provided. In response to systems, a frame of data corresponding to a multimedia service and a data packet including the frames are dynamically generated and transmitted, wherein the payload of the data packet corresponds to the heterogeneous networks or heterogeneous systems. May include a sequence frame, a main frame, a redundancy frame, and an XOR frame, and may include the main frame and the redundancy frame according to loss information of a data packet in the receiving apparatus. Then, information about the frames included in the payload, that is, information indicating the inclusion of sequence frames in the payload or the inclusion of the main frame, redundancy frame, and XOR frame in the payload, or the number of frames Indicative information is included in a mode field of the payload, and information about the payload is included in a header of the data packet.

In addition, in the communication system according to the embodiment of the present invention, as described above, after receiving a data packet transmitted corresponding to a connection to heterogeneous networks or heterogeneous systems of a terminal, that is, a WLAN system or a mobile communication network system. And decoding the sequence frames included in the payload of the data packet, recovering the sequence frames lost from the decoded sequence frames, and restoring data transmitted from the transmitting apparatus, that is, data corresponding to the multimedia service. After decoding the main frame from the frames included in the payload of the data packet, if there is a lost sequence frame in the decoded main frame, the redundancy frame is decoded, and the decoded redundancy frame also loses the sequence frame. If so, decode the XOR frame. Identify the lost sequence frame in the decoded main frame, and recover the lost sequence frame from the decoded redundancy frame to the sequence frame corresponding to the lost sequence frame if the lost sequence frame exists; When the lost sequence frame is also lost in the decoded redundancy frame, the lost sequence frame is recovered through the XOR frame to restore data transmitted by the transmitting apparatus, that is, data corresponding to the multimedia service.

While the invention has been shown and described with reference to certain preferred embodiments thereof, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention. Therefore, the scope of the present invention should not be limited by the described embodiments, but should be determined by the scope of the appended claims, as well as the appended claims.

Claims (20)

An apparatus for transmitting data in a communication system,
Receiving unit for receiving the access information of the network systems to which the terminal is connected;
A packet generation unit that checks the access information and generates a data packet having a first structure when the terminal accesses the first system and generates a data packet having a second structure when the terminal accesses the second system; And
A transmitter for transmitting the data packets to a receiver;
The data packet of the first structure comprises sequentially consecutive sequence frames;
The data packet of the second structure includes a main frame including the sequence frames, a redundancy frame in which the sequence frames are delayed in sequence, and an exclusive OR frame of the main frame. A data transmission device, characterized in that.
The method of claim 1,
When the terminal accesses the first system, the sequence frames including data corresponding to the terminals are generated. When the terminal accesses the second system, the main frame and the redundancy frame including the data are generated. And a frame generator for generating the XOR frame.
The method of claim 1,
The data packets include a header and a payload comprising the sequence frames or a payload comprising the main frame, the redundancy frame and the XOR frame;
The payload is a data field, characterized in that it comprises a mode field (mode field) containing information about the frames and the frames.
The method of claim 3,
The mode field includes information indicating the inclusion of the sequence frames or the inclusion of the main frame, the redundancy frame, and the XOR frame, and information indicating the number of the frames.
5. The method of claim 4,
And wherein the mode field includes sequence delay information of the sequence frames in the redundancy frame.
The method of claim 1,
When the loss ratio for the data packets at the receiver is less than a threshold value, the data packet of the second structure includes the main frame and the redundancy frame in a payload. Device.
The method according to claim 6,
And when the loss rate is greater than a threshold, the data packet of the second structure includes the main frame, the redundancy frame, and the XOR frame in the payload.
The method according to claim 6,
And the redundancy frame in which the sequence frames of the main frame are delayed according to the loss rate is generated.
The method of claim 1,
The XOR frame includes data frames as a result of performing an XOR operation on predetermined sequence frames adjacent to the sequence frames of the main frame.
An apparatus for receiving data in a communication system,
Receiving unit for receiving a data packet generated corresponding to the network systems to which the terminal is connected from the transmitter;
A confirmation unit for confirming control information included in a header of the data packet and information on a plurality of frames included in a payload of the data packet;
A decoder for decoding a plurality of frames included in the payload; And
And a reconstruction unit for reconstructing data transmitted by the transmitter through the decoded plurality of frames;
The receiver may further comprise:
When the terminal accesses the first system, receives the data packet including sequentially consecutive sequence frames;
When the terminal accesses the second system, a main frame including the sequence frames, a redundancy frame in which the sequence frames are delayed in sequence, and an exclusive OR frame of the main frame are included. And receiving the data packet.
The method of claim 10,
The data packet includes a header and a payload comprising the sequence frames or including the main frame, the redundancy frame and the XOR frame;
And the payload comprises a mode field including information about the frames and the frames.
12. The method of claim 11,
The mode field includes information indicating the inclusion of the sequence frames or the inclusion of the main frame, the redundancy frame and the XOR frame, and information indicating the number of the frames.
The method of claim 12,
And the checking unit, through the header and the mode field, identifies the size of the payload, the length of each of the frames, and the starting point of each of the frames in the payload.
The method of claim 10,
The decoder decodes the sequence frames;
And the reconstructing unit recovers the sequence frames lost in the decoded sequence frames.
The method of claim 10,
The decoder, after decoding the main frame, decodes the redundancy frame in the plurality of frames if there is a missing sequence frame in the sequence frames of the decoded main frame;
The recovery unit recovers the lost sequence frame from the decoded redundancy frame to a sequence frame corresponding to the lost sequence frame.
16. The method of claim 15,
The decoder decodes the XOR frame when a sequence frame corresponding to the lost sequence frame is lost in the decoded redundancy frame;
The reconstructor may perform an XOR operation on an XOR operation result frame corresponding to the lost sequence frame in the decoded XOR frame and sequence sequences adjacent to the lost sequence frame in the decoded main frame to perform the lost sequence frame. Data receiving apparatus, characterized in that for recovering.
In the communication system for transmitting and receiving data,
Receiving connection information of network systems to which the terminal is connected;
After generating the connection information, dynamically generating a data packet corresponding to a connection of the terminal to the network systems; And
Transmitting the data packet to a receiver;
Wherein the generating comprises:
When the terminal accesses the first system, sequentially generates the data packet including consecutive sequence frames;
When the terminal accesses the second system, a main frame including the sequence frames, a redundancy frame in which the sequence frames are delayed in sequence, and an exclusive OR frame of the main frame are included. And transmitting the generated data packet.
The method of claim 17, wherein the generating step,
If the loss ratio for the data packet at the receiver is less than a threshold, generate the data packet including the main frame and the redundancy frame;
And generating the data packet including the main frame, the redundancy frame, and the XOR frame when the loss rate is greater than a threshold.
18. The method of claim 17,
After receiving the data packet, decoding the sequence frames included in the data packet; And
Recovering sequence frames lost in the decoded sequence frames.
18. The method of claim 17,
After receiving the data packet, decoding the main frame included in the data packet;
Decoding the redundancy frame if there is a missing sequence frame in the sequence frames of the decoded main frame;
Decoding the XOR frame when the sequence frame corresponding to the lost sequence frame is lost in the decoded redundancy frame;
Recovering the lost sequence frame from the decoded redundancy frame to a sequence frame corresponding to the lost sequence frame; And
Recovering the lost sequence frame by performing an XOR operation between an XOR operation result frame corresponding to the lost sequence frame in the decoded XOR frame and sequence sequences adjacent to the lost sequence frame in the decoded main frame. Data transmission and reception method characterized in that it further comprises.

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