KR20200015655A - Method and apparatus for transmitting and receiving data packet - Google Patents

Abstract

According to an embodiment of the present invention, a reception device receives a data packet including a packet header and a packet payload, wherein 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, and 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 on the data packet, the QoS classifier flag indicates whether QoS classifier information including transmission priority information of the data packet and information indicating delay sensitivity of the payload data is used, and the flow identifier flag indicates whether flow identifier information indicating a flow identifier is used.

Description

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

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

In recent multimedia services, a hybrid network connecting a broadcasting network and a communication network at the same time, and an MMT (MPEG Media Transport) technology for providing a composite multimedia data provided with multimedia data, applications and files are provided. This is under consideration.

MMT technology relates to multimedia transmission technology based on Moving Picture Experts Group (MPEG), which replaces MPEG-2 Transport Stream (TS) for broadcasting and multimedia services to multi-function smart TVs, multi-view TVs, and N-screens. The present invention can provide an efficient MPEG transmission technology in a multimedia service environment that changes based on IP (Internet Protocol).

In addition, due to the increased consumption of multimedia data and the development of technology, a composite multimedia including various types of multimedia contents such as the above-mentioned multimedia data, applications, and files at a time when only one or two multimedia sources are consumed. Data has emerged.

The composite multimedia data includes various types of multimedia contents (hereinafter, referred to as "multiplex multimedia contents"). In the transmission of the composite multimedia data, the multimedia contents are divided or converged into respective multimedia contents 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 may be 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. The transmitted data packets are reconstructed into composite multimedia data at the receiving end.

Currently, when transmitting complex multimedia data in a complex network, it is difficult to provide an efficient service suitable for a complex network environment.

Therefore, in order to provide an efficient service suitable for a complex network environment, a method of constructing a complex multimedia data packet according to the characteristics of the multimedia data is required to construct and decompose the corresponding complex 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 complex 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 MMT packets are defined, and accordingly, the data packet is configured. A method and apparatus can be provided.

Method according to an embodiment of the present disclosure; A method of receiving a data packet, comprising: receiving a data packet comprising a packet header and a packet payload, wherein the packet payload comprises a payload header and payload data, and the payload data is data At least one fragment of the unit or at least one complete data unit, wherein the packet header comprises a packet identifier, a sequence number, a time stamp, a 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 indicates at least one data packet having the packet identifier. Information for identifying, wherein the time stamp indicates time information for the data packet. In addition, the QoS classifier flag indicates whether QoS classifier information including transmission priority information of the data packet and information indicating a delay sensitivity of the payload data is used, and the flow identifier flag indicates a flow identifier. It is characterized by indicating whether the flow identifier information indicated 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, The load data includes at least one fragment of the data unit 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 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. Information for identifying a packet of data, wherein the time stamp is included in the data packet. And the QoS classifier flag indicates whether QoS classifier information including transmission priority information of the data packet and information indicating delay sensitivity of the payload data is used, and the flow identifier flag. Represents whether or not flow identifier information indicating a flow identifier is used.

Another apparatus according to an embodiment of the present disclosure; A transmitter, comprising: a transmitter and a controller for controlling the transmitter to transmit a data packet including a packet header and a packet payload, wherein the packet payload includes a payload header and payload data, The load data includes at least one fragment of the data unit 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 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. Information for identifying a packet of data, wherein the time stamp is included in the data packet. And the QoS classifier flag indicates whether QoS classifier information including transmission priority information of the data packet and information indicating delay sensitivity of the payload data is used, and the flow identifier flag. Represents whether or not 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 the data packet configured based on the same is transmitted and received. As a result, an efficient service suitable for a complex network environment may be provided when the complex multimedia data is transmitted.

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

Hereinafter, the operation principle of the preferred embodiment of the present disclosure will be described in detail with reference to the accompanying drawings. Like reference numerals are used to designate like elements even though they are shown in different drawings, and in the following description of the various embodiments of the present disclosure, a detailed description of related well-known functions or configurations is provided. If it is determined that the subject matter may be unnecessarily obscured, the detailed description thereof will be omitted. In addition, terms to be described below are terms defined in consideration of functions in various embodiments of the present disclosure, and may be changed according to a user's or operator's intention or custom. Therefore, the definition should be made based on the contents throughout the specification.

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

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

In a complex network environment described in various embodiments of the present disclosure, a connection structure of a server and a client may be defined in a dedicated network (hereinafter, referred to as a 'broadcast network') for broadcast broadcasting and a network for internet communication. (Hereinafter, referred to as a 'broadband network') may be simultaneously provided to the same client, and the client refers to an environment in which a service may be provided through a plurality of networks. In addition, the plurality of network environments may be a combination of a broadcast network, a broadband network, or may be configured to 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 for processing 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 sublayers correspond to the multimedia codec (A) 100, the multimedia codec (B) 101, and the MMT E.3 layer 102. The multimedia codec 100 and the multimedia codec 101 have a difference in function, respectively.

For example, the output of the H.264 codec corresponds to a network adaptation layer (NAL) unit that provides digital compressed video multimedia with characteristic information of the multimedia, signaling required for decoding, and the like. As another example, the output of the H.262 codec applies only to digital compressed video multimedia. For example, the multimedia codec (B) 101 may use an H.264 codec, and the multimedia codec (A) 100 may use 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, the 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 kinds 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 information within a range of transmission data units that can be used for transport packet configuration. However, when compared with the NAL unit, the MFU may have a payload of all kinds of multimedia sources such as audio, text, application, and web page in addition to the video signal. There is a difference. The function of the MME E3 layer 102 will be described in detail later with reference to FIGS. 2, 3, and 4.

The MME E.2 layer 103 collects various types of MFUs delivered from one multimedia source and configures them as media processing units (MPUs). The MME E.2 layer 103 generates an MMT asset that configures the MPU as one stream. Finally, MME E1. The sublayer 104 configures an MMT package that can serve a user using a plurality of MMT assets.

The transmitting device 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 the packet to the receiving device through a packetization step. The MPU is composed of MFUs that are the smallest units that can be consumed. When the independent configuration is possible, the MPU is configured to be consumed and delivered to the user in a bundle of spatial interval units. In addition, the configuration of the MFUs can be variably adjusted in consideration of transmission efficiency in one MPU according to the transmission environment.

Hereinafter, a 'packet header configuration step' for packet configuration and a 'packet payload configuration step' for payload configuration of a packet, which are included in a step for transmitting complex multimedia data in a transmission apparatus according to an embodiment of the present disclosure. Explain separately.

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. The MMT payload is included in an MMT packet operating in a transmission control protocol (TCP) / user datagram protocol (UDP) environment or an internet protocol real-time transport protocol (RTP) payload. It may be transmitted to the terminal.

According to an embodiment of the present disclosure, a header region of a universally configurable MMT payload for transmitting complex multimedia data 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.

One) Length field:

The Length field indicates the length of the payload (Data) and is represented by a total of 16 bits. The size of the padded data after packetization may be calculated based on the value of the Length field to separate and process data necessary for an actual operation. In addition, when FEC (Forward Error Correction) is applied, a position of FEC ID (IDentifier) information having 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 the MMT delivery unit. The Type field is represented by 8 bits and, as an example, indicates the type of data as shown in Table 2 below.

Type Data configuration type information MFU The data in the payload indicates that it can make up the MFU. MPU The data in the payload indicates that the MPU can be configured. Signaling message Indicates that the data of the payload may constitute a signaling message. Parity data The data of the payload indicates that data required for processing parity data or automatic request retransmission (ARQ) data of the FEC can be configured. User defined data Indicates that the payload data can constitute data other than the above types.

3) Fragment indicator (FI) field:

The FI is represented by 2 bits, and when data of the same type to be transmitted is divided into partial data having a size of a basic unit, data of a complete basic unit may be configured through corresponding information. The FI indicates that the corresponding partial data among the partial data in which the same type of data is divided into basic units is the partial data corresponding to the beginning, the middle and the last of the data. For example, when the data type of the payload is MPU, the receiving device uses FI as a bundle unit of MPU processing. That is, one complete MPU may be received by acquiring a FI indicating the partial data corresponding to the beginning, the middle, and the last of the partial data divided by the size of the basic unit. Through this, when the receiving device receives without loss the partial data corresponding to the start, middle, and end of the MPU, the terminal may configure the complete MPU to proceed with the decoding process. For example, for non-real-time streaming transmissions such as live streaming or vedio on demand (VOD), the payload configuration for the transmission may be singular or plural MFUs or MPUs. The data may be divided into partial data corresponding to a predetermined range section and transmitted. In the case of file transfer, the entire file may be regarded as one MPU, and may be transmitted, or a part of the file obtained by dividing the entire file into partial files corresponding to a predetermined range may be transmitted. To this end, this information may represent a concatenated payload, and may provide a function of configuring a payload in MFU or MPU units by configuring the corresponding 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 represented by 6 bits. For example, in the configuration of the payload, when fragmentation information is delivered, the fragmentation flag bit is set to "1". Then, the receiving device checks the fragmentation flag bit set to "1" to access the corresponding payload header information corresponding to the Flag field. The Flag field further includes 'Aggregation information', 'Random access point flag' and 'Options flag' other than the 'fragmentation flag'. Referring to Table 3 below, when the flags are set to "0", it indicates that there is no information corresponding to the corresponding flag, and when set to "1", the information corresponding to the corresponding flag is set. Indicates.

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

5) DataOffset field:

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

6) Fragmentation information field:

The Fragmentation information field consists 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 multiple payloads of the same type and transmitted. For example, when an MPU which is one transmission unit is divided into five payloads and transmitted, the Fragmentation information field is set to 0 to 4 for each payload. Then, the receiving device may confirm that one complete MPU has been received by acquiring a number indicated by the fragmentation information field. In addition, the reception apparatus may use the number acquired through the fragmentation information field to determine how many payloads are before reception. In addition, the receiving device may recognize the lost payload using the number obtained through the Fragmentation information field, and may request the transmitter to retransmit some data corresponding thereto.

7) Aggregation information field:

The Aggregation information field indicates that transmission data included in a corresponding payload is bundled into several units configured of the same type. For example, this may indicate a case where a plurality of MPUs are configured with one payload. In addition, the aggregation information field may be composed of a number and an offset value.

Number represents the number of the same type of data included in one payload, Offset value represents the start position of each data. For example, if one payload includes three independently configurable MPUs, the number is represented by three. 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 to efficiently configure the payload in consideration of various transmission environments and services, and the Options field may be divided into information applicable to all payloads and information applicable only to a specific payload. have. In addition, very few configurations may typically be required for a particular payload. In one embodiment of the present disclosure, specific modes are defined for a particular use, except for a dedicated receiver, to allow simple payload configuration. ) Is required.

As an example, one may consider not only a generic mode that may be used to transmit certain MMT content, but also MMT streams mode and file delivery modes. In addition, an auxiliary field may be configured to transmit any data in order to anticipate the need for transmission of information related to any additional system in the future. Specifically, the auxiliary field includes a function providing identifier for providing a function for loss control, loss recovery encoding information, information for automatic error loss recovery request, a minimum memory buffer size provided by the terminal, and a temporary used for transmission data. Memory buffer size, critical transmission data, maximum loss tolerance, maximum allowable 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 which is an internet protocol. Here, the MMT packet is a data packet structure for MMT payload transmission, and the data is packetized, that is, divided into payloads based on a basic unit 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 a quality of service (QoS), a transmission time, and a timestamp applicable to control information.

The above-described additional information may be represented as a specific example thereof, as shown in Table 4 below.

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

One) Packet ID field:

The packet ID indicates an identifier of an MMT transport packet set to a constant value and is 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 component unit, an identification value for distinguishing an MMT payload from MMT signaling, 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 identification function.

2) Sequence Number field:

The sequence number field indicates a sequence number which is a unique identification number of a 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 predetermined range within a network session.

3) Timestamp field:

The time stamp field is used for checking a generation time of a transport packet. The time value included in the time stamp field is set to a value calculated based on a value set in an internet network protocol. The receiving apparatus checks the time value and utilizes it to calculate the transmission time difference between the packets and the packet transmission delay time between the transmitting side and the receiving side.

4) Flags field:

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

5) Length field:

This indicates the length of additional header information.

6) Packet Class identifier field:

The packet class identifier field is composed of information representing the attributes of the packet. The information representing the attribute of the packet represents information of a packet used for unicast, multicast, broadcast, unidirectional, bidirectional, and interactive services. Through this, information of real time and non-real time can be expressed. The information indicating the attribute of the packet is composed of the type of packet service and the bit rate configuration information of the packet. The service type is divided into real time, non-real time, broadcast, video call, and complex service. 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 consists of information indicating loss importance and delay tolerance of the packet. The information consists of 'loss priority' and 'delay allowance'. 'Loss priority' indicates the importance of the packet and indicates the importance of the loss within a certain range. Here, importance is represented by a number, and a higher number indicates that a packet is more important. The importance is used to determine processing priority and packet loss in packet forwarding in an intermediate network device. 'Delay allowance' information is displayed as the level according to the delay range section, and this information is also used as time information about processing in packet forwarding in the intermediate network device.

8) Flow identifier field:

The flow identifier field contains a flow label that identifies the particular QoS required for each flow required for each data transmission. The flow label includes, for example, a type of packet, a delay, a throughput, a synchronization parameter, and the like, and may be expressed in detail according to a data transmission type. The corresponding flow label may set its corresponding value through 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 utilized as configuration information of an intermediate network device.

9) Extension header fields:

The extension header fields can provide information by including additional information necessary when storing and using a certain unit of data in the intermediate network device.

2 is a schematic structural 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.

Referring to FIG. 2, the transmitter 200 includes a transceiver 205, a data packet generator 210, and a controller 215.

The controller 215 configures the MPU and the MFU as a basic transmission unit for complex multimedia data transmission through the data packet generator 210, passes the packetization step, and then 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 which are the minimum units that can be consumed. In addition, the data packet generator 210 is configured to be consumed and delivered to the user in the form of a bundle in units of spatial intervals when the MPI can be independently configured. In addition, the configuration of the MFUs can be variably adjusted in consideration of transmission efficiency in one MPU according to the transmission environment. The data packet generator 210 may include a header area and a data area configured as shown in Table 1 as described above with respect to the MMT packet load in an MMT packet configuration process. Detailed configurations in each area are omitted because they overlap with the previous description.

Meanwhile, the data packet generator 210 selects one of the MFU header formats predetermined according to the number of multimedias constituting the composite multimedia data, and generates an MFU of the composite multimedia data according to the selected header format. Then, the transceiver 205 packetizes the composite multimedia data and transmits the packetized composite multimedia data to the receiving side according to the instruction of the controller 215.

The controller 215 determines whether the number of multimedia items is less than a first threshold value, and selects a first MFU header when the number of multimedia items is less than the first threshold value. Herein, the first MFU header may include a start flag field of a pre-defined format indicating that the MFU starts, an MFU type field indicating a media type included in the MFU, and whether the MFU is the first MFU of specific multimedia data. It includes a last flag field indicating whether Start, End MFU (End), or whether the MFU continues (Conti) after the MFU.

If the number of multimedia items is greater than or equal to the first threshold value, the controller 215 determines whether the number of multimedia items satisfying a predetermined criterion among the multimedia items is greater than or equal to a second threshold value, and the multimedia satisfying the predetermined criterion. If the number of pieces is not greater than or equal to the second threshold value, the second MFU header is selected. Here, the second MFU header may include, for example, 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. Assume a case longer than the length of the MFU type field of the header.

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

3 is a schematic structural 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 receiving apparatus 300 includes a transceiver 305, a header detector 310, and a controller 315.

The transceiver 305 receives an MFU generated by a selected one of predetermined header formats according to the number of multimedia pieces 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 complex multimedia data packetized according to the basic transmission unit according to the identified header.

The header detection unit 310 confirms the start position of the MFU by checking a start flag included in the header, confirms an MFU type field included in the header, and checks a last flag included in the header. Check whether the last flag indicates whether the header includes an MFU type extension field. If the last flag indicates that the header includes an MFU type extension field, the header detection unit 310 combines the MFU type field and the MFU type extension field to identify the type of multimedia data included in the MFU. . If the last flag does not indicate that the header includes an MFU type extension field, the header detection unit 310 checks the type of multimedia data included in the MFU according to the MFU type field.

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

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

Meanwhile, in the detailed description of the present specification, specific embodiments have been described, but various modifications may be made without departing from the scope of the various embodiments of the present disclosure. Therefore, the scope of the present disclosure should not be limited to the described embodiments, but should be defined not only by the claims below, but also by the equivalents of the claims.

Claims (6)

In the method for receiving a data packet,
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 comprises at least one fragment or at least one complete data unit of the 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 transmission priority information of the data packet and information indicating delay sensitivity of the payload data is used;
And the flow identifier flag indicates whether flow identifier information indicating a flow identifier is used.
The method of claim 1,
The payload header includes fragmentation information and a fragment indicator,
The fragmentation information includes information regarding 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 may be 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 is And a third value indicating that the first fragment and a fragment other than the last fragment are included.

In a receiving device,
Receiving unit,
A control unit for 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 or at least one complete data unit of the 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 transmission priority information of the data packet and information indicating delay sensitivity of the payload data is used;
And the flow identifier flag indicates whether flow identifier information indicating a flow identifier is used.
The method of claim 3,
The payload header includes fragmentation information and a fragment indicator,
The fragmentation information includes information regarding 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 may be 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 is And a third value indicating that the first fragment and a fragment other than the last fragment are included.
In the transmitting device,
A transmitting unit,
A control unit for controlling the transmission unit 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 or at least one complete data unit of the 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 transmission priority information of the data packet and information indicating delay sensitivity of the payload data is used;
And the flow identifier flag indicates whether flow identifier information indicating a flow identifier is used.
The method of claim 5,
The payload header includes fragmentation information and a fragment indicator,
The fragmentation information includes information regarding 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 may be 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 is 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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