KR102112586B1 - Method and apparatus for transmitting and receiving data packet - Google Patents

Abstract

A receiving device according to an embodiment of the present disclosure receives a data packet including a packet header and a packet payload, the packet payload includes a payload header and payload data, and the payload data is a data unit It includes at least one fragment or at least one complete data unit, wherein the packet header includes a packet identifier, a sequence number, a time stamp, a quality of service (QoS) classifier flag, and Includes a flow identifier flag, the packet identifier includes information for identifying an asset to which the data packet belongs, and the sequence number identifies at least one data packet having the packet identifier Information, and the time stamp includes time information for the data packet, and the Qo The S classifier flag indicates whether QoS classifier information including information indicating transmission priority information of the data packet and delay sensitivity of the payload data is used, and the flow identifier flag indicates flow identifier information indicating a flow identifier. It is characterized by indicating whether is used.

Description

Method and apparatus for transmitting and receiving data packets {METHOD AND APPARATUS FOR TRANSMITTING AND RECEIVING DATA PACKET}

Various embodiments of the present disclosure relate to a method and apparatus for transmitting and receiving data packets.

In the recent multimedia service, MMT (MPEG Media Transport) technology for providing a hybrid network that simultaneously connects a broadcasting network and a communication network and a composite multimedia data provided with multimedia data, applications, and files This is being considered.

MMT technology is related to MPEG (Moving Picture Experts Group) based multimedia transmission technology, and instead of MPEG-2 TS (Transport Stream) for broadcasting and multimedia services to multi-functional smart TV, multi-view TV, N-Screen, etc. It can be used, and can provide efficient MPEG transmission technology in a changing multimedia service environment based on IP (Internet Protocol).

In addition, due to the increase in consumption of multimedia data and the development of technology, a composite multimedia including various kinds of multimedia contents such as multimedia data, applications, and files mentioned above in a time when only one or two multimedia sources are consumed. Data appeared.

The composite multimedia data includes various types of multimedia contents (hereinafter referred to as 'composite multimedia contents'). When transmitting the composite multimedia data, the multimedia contents are divided or fused, so that the multimedia contents are transmitted through an integrated transmission network.

For example, composite multimedia data composed of applications such as video, audio, and widgets are configured and transmitted as data packets in consideration of characteristics such as a video signal transmission method, a voice signal transmission method, and a file transmission method. do. And, the transmitted data packets are reconstructed into complex multimedia data at the receiving end.

In the case of currently transmitting complex multimedia data in a complex network, there is a problem that it is difficult to provide an efficient service suitable for the complex network environment.

Therefore, in order to provide an efficient service suitable for a complex network environment, a method for constructing a composite multimedia data packet according to the characteristics of multimedia data requires a configuration and decomposition operation of the composite multimedia content.

According to various embodiments of the present disclosure, a method and apparatus for receiving a data packet may be provided.

According to various embodiments of the present disclosure, a method and apparatus for receiving a composite multimedia data packet in a multimedia system may be provided.

In addition, according to various embodiments of the present disclosure, the structure of an MMT packet header and an MMT payload, and the use of fragmentation and aggregation of an MMT packet are defined, thereby constructing the data packet. Methods and apparatus can be provided.

Method according to an embodiment of the present disclosure; A method of receiving a data packet, the method comprising: receiving a data packet including a packet header and a packet payload, wherein the packet payload includes a payload header and payload data, and the payload data is data Includes at least one fragment of a unit or at least one complete data unit, wherein the packet header is a packet identifier, sequence number, time stamp, quality of service (QoS) classifier flag ) And a flow identifier flag, wherein the packet identifier includes information for identifying an asset to which the data packet belongs, and the sequence number includes at least one data packet having the packet identifier. It includes information for identifying, and the time stamp includes time information for the data packet. The QoS classifier flag indicates whether QoS classifier information including information indicating transmission priority information of the data packet and delay sensitivity of the payload data is used, and the flow identifier flag indicates a flow identifier. It is characterized by indicating whether or not the indicated flow identifier information is used.

An apparatus according to an embodiment of the present disclosure; A receiving apparatus comprising: a receiving unit and a control unit controlling the receiving unit to receive a data packet including a packet header and a packet payload, wherein the packet payload includes a payload header and payload data, and the pay The load data includes at least one fragment of a data unit or at least one complete data unit, wherein the packet header is a packet identifier, sequence number, time stamp, quality of service (QoS) classifier ) Flag and a flow identifier flag, wherein the packet identifier includes information for identifying an asset to which the data packet belongs, and the sequence number is at least one having the packet identifier. It includes information for identifying the data packet, the time stamp is the data packet The QoS classifier flag indicates whether the QoS classifier information including information indicating transmission priority information of the data packet and delay sensitivity of the payload data is used, wherein the QoS classifier flag is used, and the flow identifier flag Is characterized by indicating whether flow identifier information indicating a flow identifier is used.

Another device according to an embodiment of the present disclosure; In the transmitting apparatus, a transmitter and a control unit for controlling the transmitter to transmit a data packet including a packet header and a packet payload, the packet payload includes a payload header and payload data, and the pay The load data includes at least one fragment of a data unit or at least one complete data unit, wherein the packet header is a packet identifier, sequence number, time stamp, quality of service (QoS) classifier ) Flag and a flow identifier flag, wherein the packet identifier includes information for identifying an asset to which the data packet belongs, and the sequence number is at least one having the packet identifier. It includes information for identifying the data packet, the time stamp is the data packet The QoS classifier flag indicates whether the QoS classifier information including information indicating transmission priority information of the data packet and delay sensitivity of the payload data is used, wherein the QoS classifier flag is used, and the flow identifier flag Is characterized by indicating whether flow identifier information indicating a flow identifier is used.

According to various embodiments of the present disclosure, in order to configure a data packet for transmitting composite multimedia data, a specific structure for configuring and decomposing the corresponding data according to the composite multimedia content is defined, and data packets configured based on the same are transmitted and received. By doing so, it is possible to provide an efficient service suitable for a complex network environment when transmitting complex multimedia data.

1 is a diagram illustrating an example of an E-layer processing composite multimedia data for transmission according to an embodiment of the present disclosure.
2 is a diagram illustrating an example of an apparatus for transmitting a data packet for transmitting composite multimedia data according to an embodiment of the present disclosure.
3 is a diagram illustrating an example of an apparatus for receiving a data packet for transmitting composite multimedia data according to an embodiment of the present disclosure.

Hereinafter, an operation principle of a preferred embodiment of the present disclosure will be described in detail with reference to the accompanying drawings. The same components shown in the drawings are represented by the same reference numerals as possible, even if they are displayed on different drawings, and detailed descriptions of related well-known functions or configurations will be given below in describing various embodiments of the present disclosure. When it is determined that the subject matter may be unnecessarily obscured, the detailed description will be omitted. And terms to be described later are terms defined in consideration of functions in various embodiments of the present disclosure, which may vary according to a user's or operator's intention or practice. Therefore, the definition should be made based on the contents throughout this specification.

Hereinafter, an MPEG MMT (MPEG Media Transport) technique, which is one of techniques to which various embodiments of the present disclosure can be applied, will be described as an example. However, it should be noted that this is only an example for convenience of description, and various embodiments of the present disclosure are not necessarily applied only to MMT technology.

Prior to the description of various embodiments of the present disclosure, the following basic concept will be briefly described.

In a complex network environment described in various embodiments of the present disclosure, a connection structure between a server and a client is a dedicated network for broadcast broadcasting (hereinafter referred to as a 'broadcast network') and a network for internet communication. (Hereinafter referred to as 'broadband network') can be provided to the same client at the same time, the client refers to an environment that can be provided with services through a plurality of networks. In addition, a plurality of network environments may include a broadcast network and a broadband network connected in combination, or may include a wired or wireless network.

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

1 is a diagram illustrating an example of an E layer that processes composite multimedia content in MPEG MMT according to an embodiment of the present disclosure.

Referring to FIG. 1, the E layer includes three sub-layers. The three sub-layers correspond to the multimedia codec (A) 100, the multimedia codec (B) 101, and the MMT E.3 layer 102. Each of the multimedia codec 100 and the multimedia codec 101 has a functional difference.

For example, the output of the H.264 codec corresponds to a network adaptation layer (NAL) unit that provides digital multimedia information, characteristic information of the multimedia, and signaling necessary for decoding. As another example, the output of the H.262 codec is applied only to digitally compressed video multimedia. The multimedia codec (B) 101 may be an H.264 codec, for example, and the multimedia codec (A) 100 may be an H.262 codec, for example. However, in some cases, the H.264 codec may also be the multimedia codec (A) 100. In this case, information generated in the MMT E.3 layer 102 may be further included in the output of the H.264 codec.

Meanwhile, the MME E.3 layer 102 inputs various types of multimedia as a source to generate a media fragment unit (MFU). The MFU is similar to the function of the NAL unit described above, and includes priority and correlation counter within a range of transmission data units that can be used to configure a transmission packet. However, in comparison with the NAL unit, the MFU can have all kinds of multimedia sources, such as voice, text, application, and web pages, as a payload, as compared to a NAL unit. There is a difference. The function of the MME E3 layer 102 will be described in detail in the description of FIGS. 2, 3, and 4, which will be described below.

The MME E.2 layer 103 collects various types of MFUs transmitted from one multimedia source and configures them as a media processing unit (MPU). In addition, the MME E.2 layer 103 generates an MMT asset that configures the MPU as one stream. Finally, MME E1. The sub-layer 104 configures an MMT package that can service a user using several MMT assets.

The transmitting apparatus according to an embodiment of the present disclosure configures the above-mentioned MPU and MFU as a basic transmission unit for complex multimedia data transmission and transmits them to a receiving device through a packetization step. The MPU is composed of MFUs, which are the minimum units that can be consumed, and when independent configuration is possible, is configured to be consumed and delivered to the user in the form of a bundle of spatial sections. In addition, the configuration of MFUs can be variably adjusted in consideration of transmission efficiency within one MPU according to the transmission environment.

Hereinafter, a 'packet header construction step' for packet configuration and a 'packet payload construction step' for packet payload configuration included in the step of transmitting the composite multimedia data in the transmission apparatus according to an embodiment of the present disclosure Separately described.

The MMT payload of the MMT packet may be composed of a payload header area including configuration information used according to a transmission environment and a data area including transmission data. In addition, the MMT payload is included in a payload of an MMT packet operating in an environment of TCP (transmission control protocol) / user datagram protocol (UDP) or an Internet protocol RTP (real-time transport protocol). It can be transmitted to the terminal.

In an embodiment of the present disclosure, a header area of a universally configurable MMT payload for complex multimedia data transmission in a complex network environment may be configured as shown in Table 1 below.

Bit Offset 0-7 8-15 16-23 24-31 0 Length Type FI (2), Flags 32 Data Offset
/ reserved Fragmentation Information 64 Aggregation Information 96 Options (Optional) 128 Data

Each field included in <Table 1> is described as follows.

1) Length field:

The Length field indicates the length of the payload (Data, data) and is represented by a total of 16 bits. The size of the padded data after packetization may be calculated through the value of the Length field to separate and process data necessary for actual calculation. In addition, when Forward Error Correction (FEC) is applied, the location of FEC ID (IDentifier) information of a predetermined size for FEC decoding may be calculated.

2) Type field:

The Type field indicates a payload type, that is, a type of corresponding payload data, and may be delivered together with an MMT delivery unit. The Type field is represented by 8 bits, and for example, indicates the type of data as shown in Table 2 below.

Type Data configuration type information MFU It indicates that the data of the payload can constitute an MFU. MPU It indicates that the data of the payload can constitute an MPU. Signaling message It indicates that the data of the payload can constitute a signaling message. Parity data It indicates that the data of the payload can constitute data necessary for processing FEC parity data or ARQ (automatic request retransmission) data. User defined data It indicates that the data of the payload can constitute data other than the above types.

3) Fragment indicator (FI) field:

The FI is represented by 2 bits, and when the same type of data to be transmitted is divided into partial data having a size of the basic unit, data of the complete basic unit may be configured through the corresponding information. The FI indicates that among the partial data in which the same type of data is divided into basic units, the corresponding partial data is partial data corresponding to the start, middle, and end of the data. For example, when the data type of the corresponding payload is MPU, the receiving device uses FI as a bundle unit of MPU processing. That is, the MPU may receive one complete MPU by acquiring FI indicating partial data corresponding to start, middle, and end among partial data divided into the size of the basic unit. Through this, when the receiving device receives the partial data corresponding to the start, middle, and end of the MPU without loss, the terminal can configure the complete MPU to perform decoding processing. For example, in the case of a non-real-time streaming transmission such as live streaming or vedio on demand (VoD), the payload configuration for transmission may be a singular or multiple MFU or MPU, which also determines the corresponding factor. Through this, it can be divided into partial data corresponding to a predetermined range section and transmitted. Also, in the case of file transfer, the entire file may be regarded as one MPU, and the entire file may be divided into partial files corresponding to a predetermined range, and a part of the file may be transmitted. To this end, it is possible to indicate that the payload is concatenated through such information, and it is possible to provide a function capable of constructing a payload in units of MFU or MPU through the configuration of the information. It is possible to transmit a plurality of MPUs or MFUs of the same type, signaling messages and parity data in one payload.

4) Flags field:

The Flag field indicates flag switch information indicating configuration information of a corresponding payload and is indicated by 6 bits. For example, in the configuration of the corresponding payload, when fragmentation information is transmitted, the fragmentation flag bit is set to “1”. Then, the receiving device checks the fragmentation flag bit set to “1” so that the corresponding payload header information corresponding to the Flag field can be accessed. The Flag field further includes 'Aggregation information', 'Random access point flag', and 'Options flag' other than the 'fragmentation flag'. Referring to <Table 3> below, the flags are commonly, when set to “0”, indicates that there is no information corresponding to the flag, and when set to “1”, information corresponding to the flag is set. Indicates.

Flag Description Fragmentation information flag When set to "1", indicates that the information in the Fragmentation information field is set. Aggregation information flag When set to "1", indicates that the information in the Aggregation information field is set. Random access point flag When set to "1", it indicates that the data of the corresponding payload contains data used for the Random Access Point. For example, when a signaling message containing service configuration information includes data constituting a starting point of arithmetic processing or a start point of independently processable data, a corresponding flag is set. Options flag When set to "1", indicates that the information in the Option field is set.

5) DataOffset field:

The DataOffset field includes information variably indicating a position value at which the actual data of the payload starts, and is represented by 8 bits. Using the value of the DataOffset field, the receiving device may access a location where actual data starts.

6) Fragmentation information field:

The Fragmentation information field is composed of a number, and the number is used as a serial number of each of the divided payloads when data of a transmission unit is divided into several payloads of the same type and transmitted. For example, when one transmission unit MPU is divided into 5 payloads and transmitted, the Fragmentation information field is set from 0 to 4 for each payload. Then, the receiving device can confirm that one complete MPU has been received by obtaining the number indicated by the Fragmentation information field. In addition, the receiving device may be used to determine that several payloads are received before using the number obtained through the Fragmentation information field. In addition, the receiving device may recognize the lost payload by using the number obtained through the Fragmentation information field, and request a retransmission of some data corresponding thereto to the transmitting side.

7) Aggregation information field:

The Aggregation information field indicates that the transmission data included in the corresponding payload are grouped into multiple units of the same type. As an example, it may represent a case where a plurality of MPUs are configured with one payload. In addition, the Aggregation information field may be composed of Number and Offset values.

Number represents the number of data of the same type included in one payload, and Offset value represents the starting position of each data. For example, when three independently configurable MPUs are included in one payload, the corresponding number is represented as 3. In addition, the offset value, which is additional information, indicates starting points of each included data. As a specific example, assume that the Aggregation information field indicates two Offset values among three MPUs. The offset value of the first data can be accessed through the dataoffset value of the payload header, and the offset values of the other two data can be accessed through the offset values of the corresponding information.

8) Options field:

The Options field is configured when the corresponding payload contains additional information. It is necessary that the configuration of the payload needs to be efficiently configured in consideration of various transmission environments and services, and the Options field can be divided into information applicable to all payloads and information applicable only to specific payloads. have. In addition, very little configuration may typically be required for a particular payload, in one embodiment of the present disclosure certain modes defined for a specific purpose, except for a dedicated receiver, to allow simple payload configuration. ) Is required.

For example, as well as a generic mode that can be used to transmit certain MMT content, MMT streams and file delivery modes can be considered. In addition, an auxiliary field may be configured to transmit arbitrary data in order to predict the need for transmission of information related to any additional system in the future. Specifically, in the auxiliary field, a function providing identifier capable of providing a function for loss control, loss restoration encoding information, information for an automatic error loss recovery request, a minimum memory buffer size to be provided by the terminal, and a temporary used in transmission data Memory buffer size, critical transmission data, maximum loss allowance, maximum allowed packet delay time, average packet delay time and synchronization code information for network synchronization may be included.

Meanwhile, the MMT payload according to an embodiment of the present disclosure may be transmitted by an MMT packet or an RTP packet that is an Internet protocol. Here, the MMT packet is a data packet structure for transmitting an MMT payload, and the data is packetized, that is, divided into basic units of the payload and transmitted to the network. In addition, the MMT transport packet according to an embodiment of the present disclosure may include additional information related to transmission of the header area. For example, the additional information may include a packet ID, a packet number, a flow ID for providing Quality of Service (QoS), a timestamp that can be applied as transmission time and control information.

The additional information described above may be represented as <Table 4> below as a specific example.

Bit Offset 0-7 8-15 16-23 24-31 0 Packet_id Sequence number 32 Sequence Number Timestamp 64 Timestamp Flags / length Packet Class identifier 96 QoS Classifier Flow identifier Extension header fields

1) Packet ID field:

The packet ID indicates the identifier of the MMT transport packet set to a constant value, and represented by 16 bits. The packet ID is an identification value for distinguishing an MMT payload from an MPU, an identification value of MFUs, or an asset that is an upper constituent unit, an identification value for distinguishing an MMT payload from MMT signaling, It is set as an identification value for identifying FEC parity data and an identification value for distinguishing user defined data. In addition, a packet-level packet multiplexing function may be provided through the corresponding identification function.

2) Sequence Number field:

The sequence number field indicates a sequence number that is a unique identification number of the transmitted MMT packet, and is represented by 32 bits. The receiving device can determine whether the corresponding packet is lost by checking the sequence number, and can perform a packet sorting function according to the sequence number. In addition, the sequence number in the sequence number field may be sequentially increased for each MMT packet or ASSET, and represents a globally unique value within a certain range within a network session.

3) Timestamp field:

The time stamp field is used for purposes of confirming the time of generation of a transport packet. The time value included in the time stamp field is set to a value calculated based on the value set in the Internet network protocol. The receiving device checks the time value and uses it to calculate a difference in transmission time between packets and a packet transmission delay time between a transmitting side and a receiving side.

4) Flags field:

The Flags field is composed of flag information indicating that there is additional header information of the corresponding packet. The flag information, when set to a "0" bit in common, indicates that there is no corresponding information, and when set to a "1" bit, indicates that the corresponding information is set. The additional header information indicates that information such as 'Packet class identifier flag', 'QoS classifier flag', and 'flow identifier flag' is included. When the network intermediate device checks the information, for example, the network intermediate device utilizes the information for packet transmission for providing QoS service. As another example, the corresponding information of the network intermediate device may be used for 'report packet discarding', 'packet transmission scheduling setting' or 'packet reconfiguration information'.

5) Length field:

Indicates the length of additional header information.

6) Packet Class identifier field:

The packet class identifier field is composed of information indicating the attribute of the corresponding packet. The information indicating the attribute of the packet indicates packet information used for unicast, multicast, broadcast, unidirectional, bidirectional, and interactive services. Through this, real-time and non-real-time information can be expressed. The information indicating the properties of the packet is composed of a packet service type and packet bit rate configuration information, and the service type is divided into real-time, non-real-time, broadcast, video call, and composite services. 5>.

Bits 0-2 Bit rate 111 Constant Bit Rate (CBR) 110 Real-Time Variable Bit Rate (rt-VBR) 101 Non-Real-Time Variable Bit Rate (nrt-VBR) 100 Available Bit Rate (ABR) 011 Unspecified Bit Rate (UBR)

7) QoS Classifier field:

The QoS Classifier field is composed of information indicating whether a packet has a loss importance and a delay. The information consists of 'loss priority' and 'delay allowance'. 'Loss priority' indicates the importance of the corresponding packet and indicates the importance of loss within a certain range. Here, the importance is expressed as a number, and the higher the number, the more important the packet. In addition, the importance is used to determine processing priority and packet loss in packet transmission in an intermediate network device. The 'Delay allowance' information is displayed at a level according to the delay range section, and the corresponding information is also used as time information regarding processing in packet transmission in an intermediate network device.

8) Flow identifier field:

The flow identifier field includes a flow label that identifies a specific QoS required for each flow required for each data transmission. The flow label includes, for example, a packet type (Type of Packet), delay (Delay), throughput (Throughput), synchronization parameters (Synchronization parameter), etc., specifically, it can be represented by subdivided according to the data transmission type. The corresponding flow label can be set to the corresponding value through the cross-reference data exchange between the transmitting side and the receiving side before starting the service. In some cases, cross-reference exchange data may be used as configuration information of an intermediate network device.

9) Extension header fields:

When the extension header fields store and utilize a certain unit of data in an intermediate network device, additional information necessary for this is provided to provide information.

2 is a schematic configuration diagram showing an example of an apparatus for transmitting a data packet for transmitting composite multimedia data according to an embodiment of the present disclosure.

Referring to FIG. 2, the transmission device 200 includes a transmission / reception unit 205, a data packet generation unit 210, and a control unit 215.

The control unit 215 configures the MPU and MFU as the basic transmission unit for complex multimedia data transmission through the data packet generation unit 210, passes through the packetization step, and transmits the corresponding packet to the receiving device ( 215). The data packet generator 210 according to an embodiment of the present disclosure configures an MPU with MFUs as a minimum unit that can be consumed. In addition, when the independent configuration of the MPI is possible, the data packet generator 210 is configured to be consumed and delivered to the user in the form of a bundle of spatial sections. In addition, the configuration of MFUs can be variably adjusted in consideration of transmission efficiency within one MPU according to the transmission environment. In the process of configuring the MMT packet, the data packet generator 210 may be configured with a header area and a data area configured as shown in Table 1 described above for loading the MMT packet. Detailed configuration in each area is omitted because it overlaps with the previous description.

Meanwhile, the data packet generator 210 selects one of the predetermined MFU header formats according to the number of multimedia elements constituting the composite multimedia data, and generates an MFU of the composite multimedia data according to the selected header format. Then, the transceiver 205, according to the instructions of the control unit 215, packetizes the composite multimedia data and transmits the packetized composite multimedia data to a receiver.

The control unit 215 determines whether the number of the multimedias is less than a first threshold, and selects a first MFU header when the number of the multimedias is less than the first threshold. Here, the first MFU header includes a start flag field of a predetermined type indicating that the MFU is started, an MFU type field indicating a media type included in the MFU, and whether the MFU is the first MFU of specific multimedia data ( Start), a last flag field indicating whether the last MFU is recognized (End), or whether the MFU continues after the MFU (Conti).

When the number of the multimedias is equal to or greater than the first threshold, the control unit 215 determines whether the number of multimedias satisfying a predetermined criterion among the multimedias is greater than or equal to a second threshold, and the multimedia satisfying the predetermined criterion If the number of them is not equal to or greater than the second threshold, a second MFU header is selected. Here, the second MFU header, for example, may include the start flag field, the MFU type field, and the last flag field, and the length of the MFU type field of the second MFU header is the first MFU It is assumed that the header is longer than the MFU type field length.

The controller 215 selects a third MFU header if the number of multimedia satisfying the predetermined criterion is greater than or equal to the second threshold. Here, the third MFU header includes the start flag field, the MFU type field, the last flag field, and the MFU type extension field, and the MFU type extension field is the MFU type of the third MFU header In combination with a field, it indicates the media type included in the MFU, and the last flag field indicates that the MFU type extension field is present.

3 is a schematic configuration diagram of an apparatus for receiving a data packet for transmitting composite multimedia data according to an embodiment of the present disclosure.

Referring to FIG. 3, the reception device 300 includes a transmission / reception unit 305, a header detection unit 310, and a control unit 315.

The transceiving unit 305 receives the MFU generated by a selected one of predetermined header formats according to the number of multimedia elements constituting the composite multimedia data. Then, the header detector 310 checks the header of the received MFU. Thereafter, the controller 315 controls the transceiver 350 to receive the composite multimedia data packetized according to the basic transmission unit according to the identified header.

The header detector 310 checks the start flag included in the header to check the start position of the MFU, checks the MFU type field included in the header, and checks the last flag included in the header to check the It is checked whether the last flag indicates whether the header includes an MFU type extension field. When the last flag indicates that the header includes the MFU type extension field, the header detection unit 310 combines the MFU type field and the MFU type extension field to check the type of multimedia data included in the MFU. . The header detection unit 310 checks the type of multimedia data included in the MFU according to the MFU type field, if the last flag does not indicate that the header includes an MFU type extension field.

Transmission data according to an embodiment of the present disclosure may be divided into a single payload or a payload corresponding to a size of a basic unit according to a transmission environment, and transmitted as a plurality of payloads. At this time, each payload may be packetized into each packet and transmitted. Alternatively, packets may be multiplexed and transmitted through a composite network channel.

In addition, it is possible to provide an interleaving function in a certain unit in consideration of a specific transmission function, and the payload can be defined as a fairly efficient and simple as a possible general unit structure of a transport layer.

On the other hand, in the detailed description of the present specification, specific embodiments have been described, but various modifications are possible without departing from the scope of various embodiments of the present disclosure. Therefore, the scope of the present disclosure should not be limited to the described embodiments, but should be determined not only by the scope of the claims described below, but also by the claims and equivalents.

Claims (6)

A method for receiving a data packet,
And receiving a data packet including a packet header and a packet payload,
The packet payload includes a payload header and payload data,
The payload data includes at least one fragment of a data unit or at least one complete data unit,
The packet header includes a packet identifier, a sequence number, a time stamp, a quality of service (QoS) classifier flag, and a flow identifier flag.
The packet identifier includes information for identifying an asset to which the data packet belongs,
The sequence number includes information for identifying at least one data packet having the packet identifier,
The time stamp includes time information for the data packet,
The QoS classifier flag indicates whether QoS classifier information including information indicating transmission priority information of the data packet and delay sensitivity of the payload data is used,
The flow identifier flag indicates whether the flow identifier information indicating the flow identifier is used or not.
According to claim 1,
The payload header includes segmentation information and fragment indicators,
The segmentation information includes information on the number of at least one packet payload including at least one fragment of the data unit to be received following the packet payload,
The fragment indicator includes a first value indicating that the packet payload includes the first fragment of the data unit, a second value indicating that the packet payload includes the last fragment of the data unit, and the packet payload. And one of a third value indicating that the first fragment and a fragment other than the last fragment are included.

In the receiving device,
The receiver,
And a control unit controlling the receiving unit to receive a data packet including a packet header and a packet payload,
The packet payload includes a payload header and payload data,
The payload data includes at least one fragment of a data unit or at least one complete data unit,
The packet header includes a packet identifier, a sequence number, a time stamp, a quality of service (QoS) classifier flag, and a flow identifier flag.
The packet identifier includes information for identifying an asset to which the data packet belongs,
The sequence number includes information for identifying at least one data packet having the packet identifier,
The time stamp includes time information for the data packet,
The QoS classifier flag indicates whether QoS classifier information including information indicating transmission priority information of the data packet and delay sensitivity of the payload data is used,
The flow identifier flag indicates whether flow identifier information indicating a flow identifier is used or not.
According to claim 3,
The payload header includes segmentation information and fragment indicators,
The segmentation information includes information on the number of at least one packet payload including at least one fragment of the data unit to be received following the packet payload,
The fragment indicator includes a first value indicating that the packet payload includes the first fragment of the data unit, a second value indicating that the packet payload includes the last fragment of the data unit, and the packet payload. And one of a third value indicating that the first fragment and a fragment other than the last fragment are included.
In the transmitting device,
A transmitter,
And a control unit controlling the transmitter to transmit a data packet including a packet header and a packet payload,
The packet payload includes a payload header and payload data,
The payload data includes at least one fragment of a data unit or at least one complete data unit,
The packet header includes a packet identifier, a sequence number, a time stamp, a quality of service (QoS) classifier flag, and a flow identifier flag.
The packet identifier includes information for identifying an asset to which the data packet belongs,
The sequence number includes information for identifying at least one data packet having the packet identifier,
The time stamp includes time information for the data packet,
The QoS classifier flag indicates whether QoS classifier information including information indicating transmission priority information of the data packet and delay sensitivity of the payload data is used,
The flow identifier flag indicates whether or not flow identifier information indicating a flow identifier is used.
The method of claim 5,
The payload header includes segmentation information and fragment indicators,
The segmentation information includes information on the number of at least one packet payload including at least one fragment of the data unit to be received following the packet payload,
The fragment indicator includes a first value indicating that the packet payload includes the first fragment of the data unit, a second value indicating that the packet payload includes the last fragment of the data unit, and the packet payload. And one of a third value indicating that the first fragment and a fragment other than the last fragment are included.

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