KR101695838B1 - Apparatus and method for transmitting/receiving data in communication system - Google Patents

Abstract

The present invention relates to an apparatus and method for normally transmitting / receiving data by recovering loss of a data packet in order to improve multimedia service quality in an all-internet protocol (IP) network based on wireless communication, The method comprising: receiving connection information of network systems, dynamically generating a data packet corresponding to connection of the terminal to the network systems after confirming the connection information, transmitting the data packet to a receiver, 1 system, a main frame including the sequence frames when the terminal is connected to the second system, and a main frame including the sequence frames when the terminal is connected to the second system, Redundancy frame, and an exclusive-or (X OR: exclusive OR) frame.

Description

[0001] Apparatus and method for transmitting and receiving data in a communication system [0002]

BACKGROUND OF THE INVENTION 1. Field of the Invention [0002] The present invention relates to a communication system, and more particularly, to recovering a loss of a data packet in order to improve multimedia service quality in an All-Internet Protocol (IP) And an apparatus and method for transmitting and receiving data.

BACKGROUND ART [0002] In the current communication system, active research is being conducted to provide various quality of service (QoS) services having a high transmission rate to users. In particular, the communication system has been developed, for example, as a wireless local area network (WLAN) system and mobile communication technology, and with the advent of smart phones, , Voice, and video.

In addition, as described above, in a communication system that provides a multimedia service through a terminal, various real-time multimedia services have become possible due to advancement of the network, for example, expansion of bandwidth of the network and improvement of transmission rate of the network, and improvement of terminal performance. However, in spite of an increase in the number of users desiring to receive multimedia service, an increase in data amount due to the high quality of voice and image data, and an enhanced network due to an inherent cause of the IP network which can not guarantee QoS, There is a loss.

In addition, the delay and loss in the real-time multimedia service cause a deterioration of the service quality to the user who desires to receive the multimedia service. In particular, various methods for minimizing data loss, which is the greatest factor of deteriorating the quality of service, have been proposed. For example, a loss recovery method using a forward error correction code, a transmission control method using quality or loss feedback, Lt; / RTI > However, the proposed schemes are limited in terms of data recovery performance and speed in recovering lost data, particularly data lost in a communication system that transmits and receives a large amount of data to provide multimedia services.

Therefore, in order to improve the quality of the multimedia service in the communication system providing the multimedia service, it is necessary to recover the lost data to transmit and receive data at a high speed and normally. Also, when the terminal accesses the heterogeneous networks or heterogeneous systems in the communication system In case of receiving multimedia service, it is necessary to recover lost data and transmit / receive data efficiently.

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.

It is another object of the present invention to provide an apparatus and method for recovering a loss of a data packet in order to improve the quality of a multimedia service in a communication system to transmit and receive data at high speed and normally.

Another object of the present invention is to provide a data transmitting and receiving apparatus and a data transmitting and receiving method for efficiently recovering lost data packets when a terminal is connected to a heterogeneous network or heterogeneous systems in a communication system to provide multimedia services, Method.

It is a further object of the present invention to provide a method and apparatus for multimedia communication in a communication system in which a terminal is connected to heterogeneous networks or heterogeneous systems and transmits and receives network information of a network to which the terminal itself is connected, The present invention also provides a data transmitting and receiving apparatus and method for recovering lost data packets by adaptively restoring data packets according to the connected network.

According to another aspect of the present invention, there is provided an apparatus for transmitting data in a communication system, the apparatus comprising: a receiver for receiving connection information of network systems to which the terminal is connected; A packet generator for generating a data packet of a first structure when the terminal is connected to the first system and a data packet of a second structure when the terminal is connected to the second system by checking the connection information; And a transmitter for transmitting the data packets to a receiver; Wherein the data packet of the first structure comprises sequential sequential 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 by a sequence, and an exclusive OR (XOR) 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 receiver for receiving a data packet generated from a transmitter in accordance with network systems to which the terminal is connected; A confirmation unit for checking 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 reconstructing data transmitted by the transmitter through the plurality of decoded frames; Wherein the receiving unit receives the data packet including sequential sequence frames sequentially when the terminal is connected to 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 by a sequence, and an XOR (exclusive OR) frame of the main frame are included And receives the data packet.

According to another 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 the terminal is connected; After confirming 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 step comprises the steps of: when the terminal is connected to the first system, generating 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 by a sequence, and an XOR (exclusive OR) frame of the main frame are included And generates the data packet.

The present invention resides in that when a terminal is provided with multimedia services by accessing heterogeneous networks or heterogeneous systems in a communication system, by recovering dynamically lost packets corresponding to the heterogeneous networks or heterogeneous systems, It is possible to efficiently recover lost data packets and improve the efficiency of data transmission / reception.

The present invention also provides a method of recovering a loss of a data packet by adding redundancy data to main data in a manner that does not require a recovery delay time of a lost data packet of a multimedia service in a communication system, It is possible to recover the random or burst packet loss that may occur through the wired / wireless network during the inter-media transmission in real time without the retransmission process, thereby improving the quality by reducing the delay and loss in media reproduction.

1 schematically shows a structure of a communication system according to an embodiment of the present invention;
FIG. 2 and FIG. 4 schematically illustrate a data packet structure in a communication system according to an embodiment of the present invention; FIG.
Figures 3 and 5 schematically illustrate the structure of frames of data packets in a communication system according to an embodiment of the present invention;
6 is a view schematically showing a structure of a transmitting apparatus in a communication system according to an embodiment of the present invention;
7 is a view schematically showing the structure of a receiving apparatus 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 transmitting apparatus in a communication system according to an embodiment of the present invention.
9 is a diagram schematically illustrating a process of a receiving apparatus receiving a data packet in a communication system according to an 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, for example, a communication system that provides a multimedia service. Here, in the embodiment of the present invention, a communication system including an All-Internet Protocol (IP) network based on wireless communication, for example, a wireless local area network (WLAN) (WLAN) system or a mobile communication network system. However, the data transmission / reception scheme proposed by the present invention can also be applied to other communication systems.

In addition, in the embodiment of the present invention, when a terminal is provided with multimedia services by accessing heterogeneous networks or heterogeneous systems such as a WLAN system as a first system or a mobile communication network system as a second system, The data packets are dynamically generated and transmitted according to the connected heterogeneous networks or heterogeneous systems, and the lost data packets are adaptively recovered at the time of transmission and reception of the data packets, Thereby improving transmission / reception efficiency. In other words, in the embodiment of the present invention, data packets are dynamically generated and transmitted in different ways according to heterogeneous networks or heterogeneous systems connected to the terminal, and the lost data packets are adapted And recover the lost data packet by applying different packet loss recovery schemes according to heterogeneous networks or heterogeneous systems connected to the terminal.

Here, in the embodiment of the present invention, when the terminal accesses the WLAN system and is provided with the multimedia service, a connection between the terminal and an access point (AP) , And transmits / receives a frame including data corresponding to the multimedia service as one data packet, corresponding to the connection of the terminal to the WLAN system. Particularly, in the embodiment of the present invention, a data packet including sequence frames of data corresponding to the multimedia service and the sequence frames is generated, and a call for connection to the WLAN system of the terminal The method comprising the steps of: checking connection information of the terminal to the WLAN system and data packet reception information of the terminal connected to the WLAN system and receiving a data packet; And generates and transmits data packets.

In the embodiment of the present invention, when the terminal is connected to a mobile communication network system and is provided with a multimedia service, a base station (BS) of the mobile communication network system ) Transmits and receives a plurality of frames including data corresponding to the multimedia service as one data packet, corresponding to the 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 as one data packet, and at this time, Upon connection establishment of a call for connection to a network system, connection information to the mobile communication network system of the terminal and connection information to the mobile communication network system to confirm data packet reception information of the terminal receiving the data packet, The main frame, the frame, and the XOR frame into one data packet (hereinafter, referred to as a " data frame " And transmits and receives the data.

In addition, in the embodiment of the present invention, when the communication system provides real-time multimedia service, as described above, the loss of the data packet occurring at the time of transmission and reception of the real-time multimedia service data is recovered, And transmits and receives a plurality of frames including data corresponding to the real-time multimedia service as one data packet, for example, a real-time transport protocol (RTP) packet. That is, in the embodiment of the present invention, a frame of data corresponding to the real-time multimedia service is dynamically generated, for example, the sequence frames of the data are generated, Frame, a redundancy frame, and an XOR frame, and generates and transmits one RTP packet including the generated sequence frames or one RTP packet including the generated main frame, the redundancy frame, and the XOR frame. 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, the communication system includes a first terminal 102 and a second terminal 122 to which multimedia services are to be provided, for example, terminals 102 and 102 connected to the terminals 102 and 122, The WLAN systems 108 and 114 and the 3G / 4G systems 110 and 116 of the mobile communication network system and the terminals 102 and 122 transmit and receive data packets corresponding to the multimedia service using heterogeneous networks or heterogeneous systems providing services. 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 the WLAN systems 108 and 114 and the 3G / 4G systems 110 and 116 IP < / RTI >

In the communication system, when the terminals 102 and 122 access the WLAN systems 108 and 114 or the 3G / 4G systems 110 and 116 to receive the multimedia service, Generates a frame of data corresponding to the multimedia service and a data packet including a frame of the data, corresponding to connection information to the WLAN systems (108, 114) or the 3G / 4G systems (110, 116) The UEs 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 access the WLAN systems 108 and 114 and receive the multimedia service, one of the sequence frames of data corresponding to the multimedia service and one of the data frames including the sequence frames 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, a main frame, a redundancy frame and an XOR frame of data corresponding to the multimedia service are generated And generates one data packet including the main frame, the redundancy frame, and the XOR frame, and the terminals 102 and 122 and the BSs 106 and 120 transmit and receive the data packet. Hereinafter, a data packet transmitted / received by the data transmitting / receiving apparatus in the communication system according to the embodiment of the present invention will be described in more detail with reference to FIG.

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

2, the data packet includes a header 200 including control information on the data packet, and a payload 250 including data corresponding to the multimedia service do. Here, when the receiving apparatus receives the data packet, the header 200 of the data packet includes all the control information necessary for restoring data of the multimedia service included in the payload 250 of the data packet .

When the terminal accesses the 3G / 4G system as a mobile communication network system in order to receive the multimedia service, the payload 250 of the data packet transmits a call setup to the 3G / 4G system The data frame including the data corresponding to the multimedia service is transmitted and received as one data packet in accordance with the connection information to the 3G / 4G system of the terminal transmitted and received at the time of receiving the multimedia service. 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. 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, in the mode field 255, information indicating the number of frames included in the payload 250 as field information and indicating the inclusion of the sequence frame 260 in the payload 250 of the data packet Information.

For example, after receiving the connection information from the reception apparatus, the transmission apparatus for transmitting the data packet checks the connection information to generate the sequence frame 260, 260 included in the payload 250 and information on the sequence frame 260 included in the payload 250 such as the number of the sequence frames 260 is included in the mode field 255.

Here, the connection information is transmitted to the transmission apparatus when a call is established when the terminal is connected to the mobile communication network system as a 3G / 4G system. When receiving the data packet from the transmitting apparatus, the receiving apparatus transmits the data packet receiving information for the data packet reception to the transmitting apparatus. At this time, the data packet receiving information is the data packet received from the receiving apparatus (I.e., a loss ratio) of the receiving apparatus to the transmitting apparatus, and when the receiving apparatus transmits the data packet as shown in FIG. 2 to the transmitting apparatus, the receiving apparatus includes the data packet loss information And transmitted to the transmission apparatus. That is, the mode field 255 may include not only information on the number of sequence frames included in the payload 250 but also a data packet including the mode field 255, as described in the field information When the transmitting apparatus receives the data packet from the receiving apparatus, information on the received data packet, that is, loss information received from the receiving apparatus.

In addition, the receiving apparatus checks the control information included in the header 200 of the data packet to recover data corresponding to the multimedia service included in the payload 250, And confirms the number of sequence frames included in the payload 250 through the mode field 255. In addition, 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 apparatus receiving the data packet, like the transmitting apparatus, includes a plurality of frames including data to be transmitted to the transmitting apparatus in the payload 250 as one data packet, Information on the number of sequence frames included in the mode field 250 and information on the reception of data packets, i.e., loss information, in the mode field 255 is transmitted from the receiving apparatus. Hereinafter, the sequence frame included in the payload of the data packet transmitted / received by the data transmitting / receiving apparatus in the communication system according to the embodiment of the present invention will be described in more detail with reference to FIG.

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

Referring to FIG. 3, in the communication system, when a terminal accesses a 3G / 4G system as a mobile communication network system and is provided with a multimedia service, the transmitter transmits data corresponding to the multimedia service with a sequence number Generates a plurality of sequence frames, and transmits a plurality of sequence frames including data corresponding to the multimedia service as one data packet.

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

In this case, n (= 1, 2, 3, ... integer) is the number of mobile stations that are sequentially generated for the real-time multimedia service when the terminal of the communication system accesses the mobile communication network system as a 3G / W (= 1, 2, 3, ... integer) is a sequence delay value for the plurality of sequence frames, and indicates a sequence number of a data packet And is determined according to the loss rate of the data packet at the receiving apparatus in order to improve the recovery performance of the lost data packet generated at the time of transmission and reception of the data packet.

The transmission apparatus in the communication system generates a sequence frame 300 of data corresponding to the plurality of sequence frames 302, 304, 306, 308 and 310, that is, the multimedia service, and then transmits a data packet including the sequence frame 300 And the receiving device decodes the data packet and restores the lost data packet, that is, decodes the sequence frame 300 included in the payload of the data packet, and also decodes the sequence frame And restores the data corresponding to the multimedia service by restoring the lost sequence frame. Hereinafter, a data packet transmitted / received by the data transmitting / receiving apparatus in the communication system according to the embodiment of the present invention will be described in more detail with reference to FIG.

4 is a diagram schematically illustrating a data packet structure in a communication system according to an embodiment of the present invention. 4 is a diagram schematically illustrating the 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 on the data packet, and a payload 450 including data corresponding to the multimedia service. In the header 400 of the data packet, when the receiving apparatus receives the data packet, the receiving apparatus receives all the control information necessary for restoring data of the multimedia service included in the payload 450 of the data packet .

The payload 450 of the data packet is transmitted to the WLAN system when the terminal accesses the WLAN system in order to receive the multimedia service, The data frame including data corresponding to the multimedia service is transmitted and received as one data packet in accordance with the connection information to the system. The payload 450 of the data packet includes a main frame 460 of data corresponding to the multimedia service and a redundancy frame 465 of the main frame 460. The payload 450 includes data And an XOR frame 470 of the main frame 460 according to packet reception information. 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, in the mode field 455, information indicating the number of frames included in the payload 450 as field information and information indicating the number of frames included in the main frame 460 and the redundancy frame 465) and information indicating the inclusion of the XOR frame (470).

For example, after receiving the connection information from the reception apparatus, the transmission apparatus that transmits the data packet checks the connection information to generate the main frame 460, the redundancy frame 465, and the XOR frame 470 The main frame 460, the redundancy frame 465 and the XOR frame 470 are included in the payload 450 and the information about the frames 460, 465, and 470 included in the payload 450, For example, the number information of the frames 460, 465, and 470 is included in the mode field 455.

Here, the connection information is transmitted to the transmission apparatus when a call is made when the terminal connects to the WLAN system. When receiving the data packet from the transmitting apparatus, the receiving apparatus transmits the data packet receiving information for the data packet reception to the transmitting apparatus. At this time, the data packet receiving information is the data packet received from the receiving apparatus (I.e., loss rate) of the receiving apparatus to the transmitting apparatus, and when the receiving apparatus transmits a data packet as shown in FIG. 4 to the transmitting apparatus, . That is, the mode field 455 includes not only the information on the number of frames included in the payload 450 as described in the field information, but also information on the number of frames included in the mode field 455 When the device receives a data packet from the receiving device, information on the received data packet, i.e. loss information, received from the receiving device.

The transmission apparatus checks the data packet reception information included in the mode field 455 of the data packet received from the reception apparatus, and when the loss rate of the data packet in the reception apparatus is smaller than the threshold value, The main frame 460 and the redundancy frame 465 are included in the main frame 450 and when the loss rate of the data packet in the receiving apparatus is larger than a threshold value, The redundancy frame 465, and the XOR frame 470 to the receiving apparatus. At this time, the mode field 455 includes information on the number of frames included in the payload 450 and data packet reception information, i.e. loss information, in the transmitter.

The receiving apparatus checks the control information included in the header 400 of the data packet to recover data corresponding to the multimedia service included in the payload 450. At this time, And confirms the number of frames included in the payload 450 through the mode field 455. The number of frames included in the payload 450 is determined based on the size of the payload 450, Therefore, the receiving apparatus confirms the length of the frames included in the payload 450 through the size of the payload 450 and the number of the frames. Here, the sizes of the frames included in the payload 450 are the same. The receiving apparatus receiving the data packet, like the transmitting apparatus, includes a plurality of frames including data to be transmitted to the transmitting apparatus in the payload 450 and transmits the frames as one data packet, Information on the number of frames included in the mode field 450 and information on the reception of data packets, i.e., loss information, in the mode field 455 in the receiving apparatus. Hereinafter, with reference to FIG. 5, a plurality of frames included in a payload of a data packet transmitted / received by a data transmitting / receiving apparatus in a communication system according to an embodiment of the present invention will be described in more detail.

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

Referring to FIG. 5, in the communication system, when a terminal accesses a WLAN system and is provided with a multimedia service, the transmitting apparatus generates a frame having a sequence number of data corresponding to the multimedia service, that is, The transmitting apparatus generates a data packet frame having the n (= 7) th sequence number, for example, a voice frame or a video frame, composes a plurality of frames including data corresponding to the multimedia service into one data packet, do.

That is, as described above, in order for the terminal to access the WLAN system and receive the multimedia service, the transmission apparatus transmits a main frame 510 and a redundancy frame 550 of data corresponding to the multimedia service and an XOR frame 580 and transmits the data packet including the main frame 510 and the redundancy frame 550 and the XOR frame 580 to the data receiving apparatus. Here, if the loss rate of the data packet in the receiving apparatus is smaller than the threshold, the main packet 510 and the redundancy frame 550 are included in the payload of the data packet and transmitted as one data packet, If the loss rate of the data packet is greater than the threshold value, the main frame 510, the redundancy frame 550, and the XOR frame 580 are included in the payload and transmitted as one data packet, Information on the number of frames included in the payload, and data packet reception information, i.e., loss information, in the transmitting apparatus.

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

Here, n (= 1, 2, 3, ... integer) denotes a sequence of frames including data sequentially generated for the real-time multimedia service when a terminal of the communication system accesses the WLAN system and is provided with a multimedia service In the embodiment of the present invention, it is assumed that n = 7 for convenience of explanation.

The integer w (= 1, 2, 3, ...) is a sequence delay value between the main frame 210 and the redundancy frame 250, and corresponds to the data packet reception information And is determined according to the loss rate of the data packet at the receiving apparatus in order to improve the recovery performance of the lost data packet generated at the time of transmission and reception of the data packet. For example, if the loss rate of the data packet is less than a threshold value, the receiver determines w by a value smaller than w determined at the time of transmission / reception of the previous data packet. If the loss rate of the data packet is greater than the threshold value W is determined to be larger than w determined at the time of transmission / reception of the previous data packet.

Here, the w is transmitted to the receiving apparatus through the mode field of the payload, and the receiving apparatus transmits the payload through the header included in the header of the data packet and the mode field of the payload, The number of frames, and the length of the frames, and in particular recognizes the starting point of each frame in the payload via w, and decodes the frames. That is, the receiving apparatus receives 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 through the payload size, the number of frames, And decodes the main frame, the redundancy frame, and the XOR frame normally to recover the lost data packet, thereby normally restoring the data transmitted by the transmitting apparatus.

The redundancy frame 550 includes a plurality of sequence frames having a sequence delay of w (= 3) of the main frame 510 having an arbitrary n (= 7) th sequence number. For example, 3 (= 3) sequence frame 562, nw (= 4) sequence frame 564, n (n = 1) sequence frame 558, nw- (= 5) sequence frame 566, an n-1 (= 6) sequence frame 568 and an n (= 7) sequence frame 570. In the main frame 510, nw- (= 1) sequence frames 512, nw-2 (= 2) sequence frames 514 and nw-1 (= 3) sequence frames 516, respectively. That is, since the sequence delay is w (= 3), the redundancy frame 550 has the sequence frames of the main frame 510 after the w (= 3) sequence frame of the main frame 510.

The XOR frame 580 includes frames resulting from the XOR operation of the main frame 510 having an arbitrary n (= 7) th sequence number. For example, the XOR frame 580 includes nw (XOR1) frame 582 as a resultant frame obtained by XORing the -3 (= 1) sequence frame 512, the nw-2 (= 2) sequence frame 514 and the nw- (= 4) sequence frame 518, the n-2 (= 5) sequence frame 520 and the n-1 (= 6) sequence frame 522 of the main frame 510 And an XOR2 frame 584 as a resultant frame to be performed.

Therefore, when the transmitting apparatus transmits a data packet frame having the n (= 7) th sequence number, the payload of the data packet includes the n (= 7) sequence frame 524 of the main frame 510, (= 4) sequence frame 564 of the frame 550 and an XOR1 frame 582 of the XOR frame 580. The mode field of the payload includes three Information indicating that the frame is included in the payload, that is, information on the number of frames. When the transmitting apparatus 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 (= 1) sequence frame 512, nw-2 (= 2) sequence frame 514 and nw-1 (= 3) sequence frame 516 of the main frame 510 are XOR The XOR frame 580 of the XOR1 (582) frame is generated as one data packet and transmitted.

When the transmitting apparatus transmits a data packet frame having an n + 1 (= 8) sequence number, an n + 1 (= 8) sequence frame 526 of the main frame 510 And the n - 2 (= 5) sequence frame 566 of the redundancy frame 550. At this time, the above two frames are included in the payload in the mode field of the payload That is, the number of frames. When the transmitting apparatus transmits the (n + 1) th data packet frame, the main frame 510 of the n + 1 (= 8) sequence frame 526 and the n-2 ) As one data packet and transmits the redundant frame 550 as one data packet.

When the transmitting apparatus transmits a data packet frame having the n + 2 (= 9) th sequence number, the payload of the data packet includes an n + 2 (= 9) sequence frame 528 And a n-1 (= 6) sequence frame 568 of the redundancy frame 550, and the mode field of the payload includes two frames as described above in the payload That is, the number of frames. When the transmitting apparatus 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) ) As one data packet and transmits the redundant frame 550 as one data packet.

In addition, when the transmitting apparatus transmits a data packet frame having an n + 3 (= 10) th sequence number, the payload of the data packet includes an n + 3 (= 10) ), The n (= 7) sequence frame 570 of the redundancy frame 550 and the XOR2 frame 584 of the XOR frame 580. At this time, the mode field of the payload Information indicating that the above-mentioned three frames are included in the payload, i.e., the number of frames is included. When the transmitting apparatus transmits the (n + 3) th data packet frame, the main frame 510 of the n + 3 (= 10) sequence frame 530 and the 2 (= 5) sequence frame 520 and n-1 (= 6) sequence frame 522 of the main frame 510 and the redundancy frame 550, As a result of performing the XOR operation, i.e., the XOR frame 580 of the XOR2 (584) frame, as one data packet.

The transmitting apparatus transmits the data packet by including the main frame 510 and the redundancy frame 550 in the payload or transmits the data packet to the payload in addition to the main frame 510 and the redundancy frame 550, (580), the receiving apparatus checks the frames included in the payload and receives data corresponding to the multimedia service transmitted by the transmitting apparatus. Here, the receiving apparatus checks the control information for the payload through the header of the data packet and checks the number of frames included in the mode field of the payload, as described above.

In addition, the receiving apparatus decodes the main frame 510 included in the payload to recover data transmitted by the transmitting apparatus. If a predetermined sequence frame is lost in the decoded main frame, Restores the lost sequence frame, i.e., the lost data packet, through the redundancy frame 550, and restores the data transmitted by the transmission apparatus. If the sequence frame lost in the main frame 510 is also lost in the redundancy frame 550, the receiving apparatus may perform the XOR operation on the lost sequence frame in the main frame 510 and the redundancy frame 550, Frame 580 and restores the data transmitted by the transmission apparatus.

For example, the receiving apparatus decodes the main frame 510 included in the payload and reconstructs data transmitted from the transmitting apparatus. As a result, nw-3 of the main frame 510 (= 1) sequence frame 512 of the redundancy frame 550 by decoding the redundancy frame 550 when the sequence frame 212 of the redundancy frame 550 is lost, 3 (= 1) sequence frame 512 of the lost main frame 510 to the nw-3 (= 1) sequence frame 512 of the first main frame 510 do. At this time, when the nw-3 (= 1) sequence frame 512 of the redundancy frame 550 is lost as well as the nw-3 (= 1) sequence frame 512 of the main frame 510, 3 (= 1) sequence frame 512 and nw-2 (= 2) of the main frame 510 by decoding an XOR1 frame 582 of the XOR frame 580 by decoding the frame 580, 3 (= 1) sequence of the lost main frame 510 through the XOR1 frame 582 which is the result of performing the XOR operation on the sequence frame 514 and the nw-1 (= 3) sequence frame 516 Restores the frame 512, and restores the data transmitted by the transmitting apparatus. 2 (= 2) sequence frame 514 of the main frame 510 and nw-1 (= 1) sequence frames 512 of the lost main frame 510. The nw- 3 (= 1) sequence frame 512 of the lost main frame 510 by performing an XOR operation on the sequence frame 516 and the XOR1 frame 582. [

The decoded main frame 510 is input to a jitter buffer of a decompression unit included in the reception apparatus, and the decoded redundancy frame 550 and the decoded XOR frame 580 are stored in a recovery A sequence frame that is lost in the decoded main frame 510 is recovered through the decoded redundancy frame 550 or the decoded XOR frame 580, The transmission data included in the payload is restored normally. Then, the receiving apparatus receives the data packet reception information corresponding to the loss of the data packet and the recovery of the lost data packet as described above, that is, the loss information of the data packet, Mode field and transmits it to the transmission apparatus. Hereinafter, an apparatus for transmitting a data packet as described above in a communication system according to an embodiment of the present invention will be described in more detail with reference to FIG.

6 is a diagram schematically showing a structure of a transmitting apparatus in a communication system according to an embodiment of the present invention. 6 through 6, when the terminal accesses heterogeneous networks or heterogeneous systems, that is, a WLAN system or a mobile communication network system, when a multimedia service is provided, the heterogeneous networks or heterogeneous systems FIG. 2 is a view schematically showing an apparatus for dynamically generating frames of data corresponding to a multimedia service and one data packet including the frames according to an embodiment of the present invention.

Referring to FIG. 6, the transmitting apparatus 600 receives connection information to the WLAN system or the mobile communication network system of the terminal, and data packet transmitted from the 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 in response to the connection to the WLAN system or the mobile communication network system after confirming 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 receiver.

More specifically, when the terminal accesses the WLAN system or the mobile communication network system and establishes a call for receiving the multimedia service, the receiving unit 610 transmits the multimedia service to the WLAN system or the mobile communication network system Lt; / RTI > The receiving unit 610 receives the data packet from the receiving apparatus, and also receives data packet reception information in the receiving apparatus, that is, loss of data packet through the mode field included in the payload of the received data packet Information is received.

The frame generator 320 generates a plurality of frames including data to be transmitted to the receiving apparatus, that is, data corresponding to the multimedia service, and transmits the frame to the WLAN system or the mobile communication network system And dynamically generates frames of data corresponding to the multimedia service in accordance with the connection. More specifically, the frame generator 320 generates the sequence frames of the data when the terminal accesses the WLAN system, as described above. When the terminal accesses the mobile communication network system Determines the number of frames and w in consideration of loss information of a data packet in the receiving apparatus, and generates a main frame and a redundancy frame according to the determined number of frames and w, or generates the main frame and the redundancy frame In addition, an XOR frame is generated.

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. At this time, in the mode field of the payload, Information about frames, in particular, information indicating the number of frames. Here, the payload of the data packet includes sequence frames, or includes 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 , And the main frame and the redundancy frame may be included according to loss information of a data packet in the receiving apparatus.

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

7 is a diagram schematically showing the structure of a receiving apparatus in a communication system according to an embodiment of the present invention. Here, FIG. 7 is a flowchart illustrating a method of transmitting a multimedia service according to an exemplary embodiment of the present invention, as illustrated in FIGS. 2 to 5, in order to allow a terminal to access a heterogeneous network or heterogeneous systems, i.e., a WLAN system or a mobile communication network system, FIG. 2 is a diagram schematically showing an apparatus for receiving data packets when frames of data corresponding to a multimedia service and one data packet including the frames are generated and transmitted dynamically according to FIG.

7, the receiving apparatus 700 includes a receiving unit 710 that receives a data packet transmitted from a transmitting apparatus, control information included in a header of the received data packet, and a payload A decoding unit 730 for decoding a plurality of frames included in the payload, a decoding unit 730 for decoding the lost frames in the decoded frames, A restoration unit 740 that restores the transmitted data, and transmits data packet reception information corresponding to the lost frame, that is, loss information of a data packet to the transmission apparatus, The access information to the WLAN system or the mobile communication network system of the terminal is set as an upper And a transmission section 750 for transmitting to the transmitting device.

More specifically, the receiving unit 710 receives the data packet transmitted by the transmitting apparatus, as described with reference to FIG. That is, the receiving unit 710 receives a data packet including data corresponding to the multimedia service, corresponding to a connection to the WLAN system or the mobile communication network system of the terminal, A payload includes a mode field and a plurality of frames including the data.

The checking unit 720 checks the control information included in the header, and checks field information included in the mode field of the payload, that is, information on a plurality of frames included in the payload E.g., information indicating the number of frames. In other words, the checking unit 720 may determine, based on the information included in the header and the information included in the mode field, the size of the payload, the number of frames, the length of the frames, Check the beginning of the frames. That is, the confirming unit 720 may include a sequence frame in the payload or a payload including a main frame, a redundancy frame, and an XOR frame in the payload, corresponding to connection of the terminal to the WLAN system or the mobile communication network system. .

Also, the decoder 730 decodes the frames included in the payload based on the information confirmed by the confirmation unit 720. [ Here, the decoder 730 decodes the sequence frames included in the payload or decodes the main frames in the frames included in the payload, as described above, Decodes the redundant frame if the sequence frame exists, and decodes the XOR frame if the decoded redundant frame also lost the sequence frame. The decoded frames are input to the jitter buffer and the recovery buffer of the decompression unit 740.

In addition, the restoring unit 740 restores the lost sequence frames in the sequence frames, and restores data transmitted by the transmitting apparatus, that is, data corresponding to the multimedia service. In addition, the restoring unit 740 may check the lost sequence frame in the decoded main frame, and if there is the lost sequence frame, the restoring unit 740 may delete the lost sequence frame in the decoded redundant frame, And restores the lost sequence frame. If the lost sequence frame is lost in the decoded redundancy frame, the lost sequence frame is recovered through the XOR frame, and the data transmitted by the transmission apparatus, i.e., the multimedia service And restores the corresponding data.

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

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

Next, in step 820, a plurality of frames including data to be transmitted to the receiving apparatus, that is, data corresponding to the multimedia service, are generated dynamically according to connection to the WLAN system or the mobile communication network system of the terminal do. Here, when the terminal accesses to the WLAN system, sequence frames of the data are generated. When the terminal accesses to the mobile communication network system, considering the loss information of the data packet in the receiver, w, and generates a main frame and a redundancy frame, or generates an XOR frame as well as the main frame and the redundancy frame, according to the thus determined number of frames and w.

In step 830, the generated plurality of frames are included in the payload to generate a data packet. At this time, information on the frames included in the payload, in particular, the number of frames is stored in the mode field of the payload Include directive information. Here, the payload of the data packet includes sequence frames, or includes 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 , And the main frame and the redundancy frame may be included according to loss information of a data packet in the receiving apparatus.

Then, in step 840, the generated data packet is transmitted to the receiving apparatus. In this case, in response to the connection to the WLAN system or the mobile communication network system of the terminal, dynamic generation of frames including data corresponding to the multimedia service, generation of a data packet including the frames, And the structure of the frames have been described in detail, and a detailed description thereof will be omitted here. Hereinafter, the operation of receiving the data packet as described above in the communication system according to the embodiment of the present invention will be described in more detail with reference to FIG.

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

Referring to FIG. 9, in step 910, the receiving apparatus receives a data packet transmitted by the transmitting apparatus, that is, receives a data packet including data corresponding to the multimedia service. Here, the receiving apparatus corresponds to a 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 the multimedia service. And receives a data packet including data corresponding to the multimedia service. 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, control information included in the header is checked, and field information included in the mode field of the payload, that is, information on a plurality of frames included in the payload, Lt; / RTI > In other words, through the information included in the header and the information included in the mode field, the size of the payload, the number of frames, the length of the frames, and the start point of the frames in the payload are identified. That is, in accordance with the connection of the terminal to the WLAN system or the mobile communication network system, it is confirmed whether the payload includes sequence frames or includes the main frame, the redundancy frame, and the XOR frame in the payload.

In step 930, frames included in the payload are decoded based on the determined information. Here, decoding the sequence frames included in the payload or decoding the main frames in the frames included in the payload, decoding the redundant frames when there is a lost sequence frame in the decoded main frame, The decoded redundancy frame also decodes the XOR frame if the sequence frame is lost.

Then, in step 940, the sequence frames lost in the sequence frames are recovered, and data transmitted by the transmission apparatus, that is, data corresponding to the multimedia service, is restored. The method may further include identifying a lost sequence frame in the decoded main frame, recovering the lost sequence frame in a sequence frame corresponding to the lost sequence frame in the decoded redundancy frame when the lost sequence frame exists, If the lost sequence frame is also lost in the decoded redundancy frame, the lost sequence frame is recovered through the XOR frame, and the data transmitted by the transmission apparatus, that is, the data corresponding to the multimedia service, is restored. Here, the structure of the data packet received from the transmitting apparatus and the frames included in the payload of the data packet, i.e., the sequence frames, or the frames included in the payload of the data packet, corresponding to the connection of the terminal to the WLAN system or the mobile communication network system The structure of the main frame and the redundancy frame as well as the structure of the XOR frame has been described in detail in the foregoing, and a detailed description thereof will be omitted here.

In the communication system according to the embodiment of the present invention, as described above, when the terminal accesses the heterogeneous networks or heterogeneous systems, that is, the WLAN system or the mobile communication network system and receives the multimedia service, Systems corresponding to the multimedia services, and one data packet including the frames, and transmits and receives data frames corresponding to the multimedia services corresponding to the heterogeneous networks or heterogeneous systems, Includes sequence frames or a main frame, a redundancy frame, and an XOR frame, and the main frame and the redundancy frame may be included according to loss information of a data packet in the receiving apparatus. The information indicating the frames included in the payload, that is, the information indicating the inclusion of sequence frames in the payload or the inclusion of the main frame, the redundancy frame and the XOR frame in the payload, or the number of frames Information indicating the header is included in the mode field of the payload, and information on the payload is included in the header of the data packet.

In addition, in the communication system according to the embodiment of the present invention, as described above, after receiving the data packet transmitted corresponding to the connection to the heterogeneous networks or heterogeneous systems of the terminal, that is, the WLAN system or the mobile communication network system , Decodes the sequence frames included in the payload of the data packet, restores the lost sequence frames in the decoded sequence frames, and restores the data transmitted by the transmission apparatus, that is, the data corresponding to the multimedia service. If a main frame is decoded in the frames included in the payload of the data packet, the decoded main frame decodes the redundant frame if there is a lost sequence frame, and the decoded redundant frame is also lost If so, it decodes the XOR frame. The method may further include identifying a lost sequence frame in the decoded main frame and restoring the lost sequence frame to a sequence frame corresponding to the lost sequence frame in the decoded redundancy frame when the lost sequence frame exists, If the lost sequence frame is also lost in the decoded redundancy frame, the lost sequence frame is recovered through the XOR frame, and the data transmitted by the transmission apparatus, that is, the data corresponding to the multimedia service, is restored.

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,
A receiving unit for receiving connection information of network systems to which the terminal is connected;
A packet generator for generating a data packet of a first structure when the terminal is connected to the first system and a data packet of a second structure when the terminal is connected to the second system by checking the connection information; And
And a transmitter for transmitting the data packets to a receiver;
Wherein the data packet of the first structure comprises sequential sequential frames;
Wherein 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 (XOR) frame of the main frame Wherein the data transmission apparatus comprises:
The method according to claim 1,
When the terminal accesses the first system, generates the sequence frames including data corresponding to the terminals, and when the terminal accesses the second system, the main frame and the redundancy frame including the data, And a frame generator for generating the XOR frame.
The method according to claim 1,
The data packets comprising a header and a payload comprising the sequence frames or including the main frame and the redundancy frame and the XOR frame;
Wherein the payload comprises a mode field including information on the frames and the frames.
The method of claim 3,
Wherein 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 frames.
5. The method of claim 4,
Wherein the mode field includes sequence delay information of the sequence frames in the redundancy frame.
The method according to claim 1,
Wherein the data packet of the second structure includes the main frame and the redundancy frame in a payload when a loss ratio for the data packets in the receiver is less than a threshold value. Device.
The method according to claim 6,
Wherein the data packet of the second structure includes the main frame, the redundancy frame, and the XOR frame in the payload when the loss rate is larger than a threshold value.
The method according to claim 6,
Wherein the redundancy frame in which the sequence frames of the main frame are delayed in sequence is generated according to the loss rate.
The method according to claim 1,
Wherein the XOR frame includes XOR result frames between predetermined sequence frames adjacent to each other in the sequence frames of the main frame.
An apparatus for receiving data in a communication system,
A receiver for receiving a data packet generated from the transmitter in accordance with network systems to which the terminal is connected;
A confirmation unit for checking 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 decompression unit for decompressing the data transmitted by the transmitter through the plurality of decoded frames;
The receiver may further comprise:
When the terminal is connected to the first system, receiving 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 by a sequence, and an XOR (exclusive OR) frame of the main frame are included And the data packet is transmitted to the data receiving apparatus.
11. The method of claim 10,
The data packet comprising a header and a payload comprising the sequence frames or including the main frame and the redundancy frame and the XOR frame;
Wherein the payload includes a mode field including information on the frames and the frames.
12. The method of claim 11,
Wherein 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 frames.
13. The method of claim 12,
Wherein the confirmation unit identifies, via the header and the mode field, a size of the payload, a length of each of the frames, and a starting point of each of the frames in the payload.
11. The method of claim 10,
The decoder decoding the sequence frames;
Wherein the restoration unit restores the lost sequence frame in the decoded sequence frames.
11. The method of claim 10,
Wherein the decoder decodes the redundancy frame in the plurality of frames when there is a lost sequence frame in the sequence frames of the decoded main frame after decoding the main frame;
Wherein the restoration unit restores the lost sequence frame to a sequence frame corresponding to the lost sequence frame in the decoded redundancy frame.
16. The method of claim 15,
The decoder decodes the XOR frame if a sequence frame corresponding to the lost sequence frame is lost in the decoded redundancy frame;
The decompression unit performs an XOR operation on an XOR operation result frame corresponding to the lost sequence frame in the decoded XOR frame and a sequence frame adjacent to the lost sequence frame in the decoded main frame, To the data receiving apparatus.
A method for transmitting and receiving data in a communication system,
Receiving connection information of network systems to which the terminal is connected;
After confirming 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 is connected to the first system, generating 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 by a sequence, and an XOR (exclusive OR) frame of the main frame are included And generating the data packet based on the received data packet.
18. The method of claim 17,
Generating the data packet including the main frame and the redundancy frame if a loss ratio for the data packet in the receiver is less than a threshold;
And generating the data packet including the main frame, the redundancy frame, and the XOR frame if the loss rate is greater than a threshold value.
18. The method of claim 17,
Decoding the sequence frames included in the data packet after receiving the data packet; And
And recovering the lost sequence frame in the decoded sequence frames. ≪ Desc / Clms Page number 20 >
18. The method of claim 17,
Decoding the main frame included in the data packet after receiving the data packet;
Decoding the redundant frame if there is a missing sequence frame in the decoded main frame sequence frames;
Decoding the XOR frame when a 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 into a sequence frame corresponding to the lost sequence frame; And
Performing an XOR operation on an XOR operation result frame corresponding to the lost sequence frame in the decoded XOR frame and a sequence frame adjacent to the lost sequence frame in the decoded main frame to recover the lost sequence frame Further comprising the steps of:

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