KR101147346B1 - Header compression system and method for internet protocol service over tactical data link - Google Patents

Abstract

PURPOSE: A header compression system and a method thereof are provided to offer an improved tactic information communication system by compressing only a header of a transport layer and a network layer without correcting a message structure. CONSTITUTION: Link-16 units(201-205) transmit an IP server/client data packet. A gateway(206) supports connection between networks through each Link-16 unit and Link-16 TDMA(Time Division Multiple Access) network(208) with a point-to-multipoint mode. The gateway changes a TDMA protocol into a IP protocol. A router(209) is connected to the gateway. The router routes a data packet from a source IP address to a destination IP address. IP servers(210,211) are connected to the router.

Description

Header Compression System and Method for Internet Protocol Service over Tactical Data Link

The present invention relates to a header compression system and method for an Internet Protocol (IP) service in a tactical data link, and more particularly, to a header compressor and a restorer for a tactical data link based on an Internet Protocol (IP), Providing a gateway design technique and compressing only the headers of the network layer and the transport layer without modifying the message structure of the existing Link-16 and other tactical data link systems to provide an improved tactical information communication system. , And a header compression system and method.

To ensure interoperability between weapon systems in the United States, Europe, and NATO member states, Link-16, which incorporates the functionality of an older tactical data link, is used. There are a growing number of countries using the Link-16 tactical data link system of the Navy and Navy 3rd Army, including Warning And Control System), air force radars, fighter aircraft, aircraft, helicopters, aircraft carriers, ships, and ground combat equipment.

Recently, as communication applications using IP (Internet Protocol) have rapidly increased with the spread of the Internet, the communication system in the future war has become a convergence of information service that integrates not only data but also voice and broadcasting services into an All-IP based network. It's going on.

The Transmission Control Protocol / Internet Protocol (TCP / IP), developed by Pentagon for military purposes, was established in 1969 by Professor KleinLook, a researcher at ARPANET (Advanced Research Projects Agency Network). As a student, Vint Surf developed TCP / IP in 1974 and standardized the technology, the existing network around the world began to be connected, and the IP of the network layer, the packet-based Pont-To-Point Internet protocol, Internet Protocol), Transmission Control Protocol (TCP) and User Datagram Protocol (UDP), which are protocols of a transport layer.

Link-4A (one of the US and NATO military's tactical data links) is applied to this IP network by applying a tactical data link based on Link-16 (US and NATO military using a TDMA network, a three-group joint military tactic data exchange network). , System integration with Link-11 (Tactical Data Link used by the US Navy), etc., and the efficiency of service development through Open API (Application Programming Interface), broadband of tactical data information exchange method, and various multimedia tactical data This is easier to implement. One of the major issues in implementing such service technology is how to effectively use network bandwidth. Therefore, the network used for Link-16, which uses Time Division Multiple Access (TDMA) technology during joint operations of the three terrestrial air forces, has to compress various header information to efficiently use IP network bandwidth. Is being presented.

IETF RFC 1144 (CTCP: Compressed Traffic Control Protocol) is a method of compressing a header by transmitting only a difference value such as a sequence number in a header field of a packet to be compressed. This method is an unsuitable compression method because it is difficult to use a retransmission method using a sequence number in a tactical data link where information real-time is important. The header restoration method using the TWICE algorithm, which is the packet error restoration method used in RFC 2057 (IPHC: Internet Protocol Header Compression) and RFC 2058 (CRTP: Compressed Real Time Protocol), is also not suitable because it increases efficiency when using sequence numbers. not. In addition, the previous three methods are a method of generating a chain error for successive packets when an error of one packet occurs in common. Thus, these methods are not suitable for tactical datalink systems that can always be exposed to jamming environments. Currently, RFC 3095 (ROHC: Robust Header Compression), which is the most widely used and efficient compression method in the mobile communication field, utilizes feedback information to increase compression efficiency and error recovery capability. However, the compression method using RFC 3095 is not suitable for tactical data links in which a network is constructed based on a point-to-multi point method.

The present invention has been proposed to solve the problems of the prior art, and an object of the present invention is a point-to-point for applying to an IP network in a Link-16 composed of a point-to-multi point network. -to-Point), provides compressors, decompressors, and gateways for maximum use of limited wireless bandwidth, without modifying the message structure of existing Link-16 and other tactical datalink systems. Provides a header compression system for providing an IP (Internet Protocol) service in a Link-16 based tactical data link, which provides an improved tactical information communication system by compressing only headers of a network layer and a transport layer. do.

Another object of the present invention is to provide a header compression method for providing an Internet Protocol (IP) service in a Link-16 based tactical data link.

In order to achieve the object of the present invention, a header compression system for providing an Internet Protocol (IP) service in a Link-16-based tactical data link, User Datagram Protocol (UDP) and IP header added to the tactical data message A compressor that generates a compressed header by compressing the compressed header and a restorer that restores the message including the compressed header, and includes an airborne warning and control system (AWACS), an air force radar, a fighter aircraft, an aircraft, a helicopter. A tactical data link unit which is assigned a unique track number (TN: Track Number) for aircraft carriers, ships, ground combat equipment, etc., and transmits data packets in an IP server / client manner; A gateway for supporting a network connection in a point-to-multipoint manner through each tactical data link unit to which the track number is assigned and a Link-16 TDMA network, and converting a TDMA protocol into an IP protocol; A router coupled to the gateway and routing data packets from a source IP address to a destination IP address; And an IP server connected to the router to receive data packets in a point-to-point manner. In the case of an intra-network of a Link-16 TDMA network, a physical address of each participating unit is provided. The message is transmitted using an In Track Number (TN), and in the case of an inter-network connection, the message is transmitted using an IP address of each participating unit.

In order to achieve the above object of the present invention, a header compression method for providing an Internet Protocol (IP) service on a Link-16-based tactical data link includes an airborne early warning (AWACS), an air force radar, a fighter aircraft, an aircraft, a helicopter. Link-16 units assigned Track Numbers (TNs), IP, and UDP port numbers for different Track Numbers (TN) (A) In the case of intra-network of a Link-16 TDMA network, the TDMA network is established using a track number (TN), which is a physical address of each participating unit of the Link-16. Transmitting the tactical data link message via; And (b) in the case of a point-to-point inter-network connection between a TDMA network and an IP network, compress and restore UDP / IP by a compressor and a decompressor using the IP address of each participating unit of Link-16, A connection using the header (compression header) through the gateway and the router (point-to-point) server / client method for connection establishment, ACK transmission and data packet transmission and reception.

The header compression system and method for providing an IP service to Link-16 according to the present invention provides a header compressor, a decompressor, and a gateway design technique used for Link-16 based on an IP network, and includes an existing Link-16. It is possible to provide an improved tactical information communication system by compressing only headers of a network layer and a transport layer without modifying message structures of various tactical data link systems.

1 is a block diagram of an IP-based network including a compressor, a decompressor, and a gateway of a header compression system for providing an Internet Protocol (IP) service in a Link-16-based tactical data link according to an embodiment of the present invention.
2 is a diagram illustrating a protocol hierarchy of Link-16.
3 is a compressed header format generated for transmitting a tactical data link message in a network in a compressor according to an embodiment of the present invention.
4 is a compression header format when the Header Type 301 of FIG. 3 is set to 000 and the More Fragment 302 is set to 1. FIG.
5 is a diagram illustrating a compression process and a restoration process of a UDP / IP header using the headers of FIGS. 3 and 4.
FIG. 6 is a diagram illustrating an embodiment of in-network tactical data link message transmission using the headers of FIGS. 3 and 4.
7 is a compression header format for connection establishment used when transmitting a point-to-point IP server / client data packet.
8 is a compressed header format for ACK transmission used when transmitting a point-to-point IP server / client data packet.
9 is a compressed header format for payload transmission used when transmitting a point-to-point IP server / client data packet.
FIG. 10 is a diagram illustrating an embodiment of a connection request / connection response in a network using the compression header formats of FIGS. 7 and 8.
FIG. 11 is a diagram illustrating an embodiment of establishing a manganese connection using the compression header format of FIGS. 7 and 8.
12 is a diagram illustrating an embodiment of data packet transmission after completing intra-network or inter-network connection setting using the compressed header format of FIGS. 7 and 8.
FIG. 13 is a diagram illustrating a compressed header format transmitted from a gateway to a Link-16 unit when a point-to-point network is connected.
FIG. 14 is a diagram illustrating an embodiment of an adaptive packing mode for increasing transmission efficiency according to channel characteristics when transmitting tactical data and general data between networks.

Hereinafter, with reference to the accompanying drawings will be described in detail a preferred embodiment of the present invention.

The present invention provides a header compression method for extending Link-16, which is currently widely used among tactical data links, to an IP network. In the situation where the existing tactical datalink message and header are not modified, only the headers of the network layer and the transport layer are compressed so that no system modification is required. In addition, the data supporting the transmission in the present invention includes a data packet generated by the IP application, not limited to the tactical data link message.

The present invention develops an intra-network structure using a track number (TN) for a Link-16 TDMA (Time Division Multiple Access) network (multi-access network), which is a tactical data message transmission method of the Link-16. In this paper, we propose a method that can be applied to an inter-network structure using an IP network using an IP address through a gateway.

1 is a block diagram of an IP-based network including a compressor, a decompressor, and a gateway for applying a tactical data link according to an embodiment of the present invention.

As illustrated in FIG. 1, an IP network including a compressor, a decompressor, and a gateway of a header compression system for providing an Internet Protocol (IP) service in Link-16 is illustrated.

A header compression system for providing an Internet Protocol (IP) service in Link-16 according to the present invention is to generate a compression header by compressing a User Datagram Protocol (UDP) and an IP header added to a tactical data message. Tracks mounted on airborne warning and control systems (AWACS), air force radars, fighters, aircraft, helicopters, aircraft carriers, ships, and ground combat equipment, including restorers that restore messages containing compressors and compressed headers. A Link-16 unit (201 to 205) to which a track number (TN) is assigned and which transmits an IP server / client data packet; It supports point-to-multipoint network connections through each Link-16 unit and Link-16 TDMA network 208 that are assigned a track number, and uses the Time Division Multiple Access (TDMA) protocol as an IP protocol. A gateway 206 for converting; A router 209 connected to the gateway 206 and routing data packets from the source IP address to the destination IP address; And IP servers 210 and 211 connected to the router 209 to receive data packets in a point-to-point manner. In the case of an intra-network of a Link-16 TDMA network, The message is transmitted using a track number (TN), which is a physical address of each participating unit, and in the case of an inter-network connection, the message is transmitted using an IP address of each participating unit.

The tactical data link network is largely composed of a Link-16 TDMA network intra-network and an inter-network.

Air Force radar 202, fighter 203, control box 204, SM-2 holding 205, fleet command gateway 206, military command / corporate (ASOC) IP server 207 Link-16 unit 202 to 207 transmit and receive data in Point-to-Multipoint Intra-Network communication using the TDMA timeslot allocation method of the Link-16 TDMA network 208.

In addition, the gateway 206 used as the Link-16 unit of the Fleet Command exchanges data with IP servers 210 and 211 existing in an external network through a router. At this time, the IP network connected to the Link-16 TDMA network has a point-to-point inter-network communication structure using UDP / IP.

The address system for the two network structures is as follows.

○ Use of Track Number (TN): Since the network structure belongs to a single collision domain when connecting a Link-16 TDMA network, the track number (TN) is not an IP address but a MAC of lower layer. Medium Access Control) addresses are used to communicate with the Link-16 units. Link-16 units communicate on a Link-16 TDMA network by addressing them by Track Number (TN).

Use of IP Address: In FIG. 1, the Airborne Warning And Control System (AWACS) 201 client node is connected to the Military Command / Army (ASOC: Army Special) via the Link-16 TDMA network (Link-16 PHY / MAC). It is used when communicating with the IP server 210, 211 connected to the IP server 207 of the Operations Command or the router 209 of the command. In this intra-network and inter-network connection, a server / client structure with a specific node communicates using an IP address when transmitting data.

2 is a diagram illustrating a protocol hierarchy of Link-16.

Data transmission in the Physical Layer and Data Link Layer of the Link-16 unit and the gateway, which is a system in which the present invention is used, is a tactic in which standard double pulses are configured as destinations through a TDMA network. Send a datalink message.

The network layer and transport layer use IP and UDP. The tactical data link message passing through the network layer is delivered to a compression layer, and a process of compressing a header, which is additional information generated in a User Datagram Protocol / Internet Protocol (UDP) layer, is performed.

The compressed header is included in the 210-bit message, and the tactical datalink message is transmitted in the following time slots by the size of the compressed header. The message including the compressed header (210 bits) is added to the Link-16 header via the existing Link-16 data link layer, followed by Channel Coding at the Physical Layer, and then TDMA. It is sent to the destination Link-16 unit via a network time slot.

When sending a point-to-point IP server / client data packet and generating IP packets, IP / UDP / Word1 / Word2 / Word3 compresses the headers in the header compression layer instead of the existing IP / UDP headers. Add Compression Header to Words Word1, Word2, and Word3, Link-16 Header at Data Link Layer, and Synchronize in Standard Double Pulse. S: Synch) and TR (Time Refinement) are added to transmit the tactical data link message to the destination Link-16 unit.

Standard Double Pulse consists of Sync (S: Sync), TR: Time Refinement (H), Header (H: Link-16 Header), and Data (D1: Data). Data D1 includes a Compressed Header / Word1 / Word2 / Word3.

Channel coding in the physical layer of the tactical data link (Link-16) adds a parity bit to control transmission errors in transmission data and RS encoding (Reed Solomon). Tactical data as a packing process using Encoding, Interleaving, Cyclic Code Shift Keying (CCSK), PN coding, Modulation, and Standard Double Pulse (STD) Link messages are sent and received.

For reference, a transmitter of a digital communication system repeats each bit three times (111 000 111 111 000) in a transmission signal (eg, 10110) such as an MPEG-2 TS stream and interleaves a predetermined sequence. RS encoded data is modulated by a specific modulation scheme and transmitted as an RF signal through a communication channel. In a communication channel, a receiver converts an RF signal into a baseband signal through a tuner (IF) and detects and demodulates it, and rearranges it in its original order through deinterleaving, and decodes the RS. It is a technique for completely recovering the original transmission signal (MPEG-2 TS stream) (e.g., 10110) by performing channel decoding using Reed Solomon decoding.

As shown in FIG. 1, the compression protocol should support intra-network connection and inter-network connection. To this end, the address system for transmitting the tactical data link message is changed.

In the Intra-Network of the Link-16 TDMA network, each participating unit (Link-16 unit) transmits a message using a track number (TN), which is a physical address, and the Inter-Network. Network) transmits a message using an IP address of each participating unit. In case of intra-network, however, the application of server / client structure that transmits data by designating IP address of specific unit rather than tactical data link message depending on broadcast In this case, the transmission / reception message has an IP address-based message transmission structure.

In the formation of the Navy 3rd Army Tactical Data Link (AWACS), fighter aircraft, aircraft, helicopters, aircraft carriers, ships, and ground combat equipment, each participating unit (Link-16 unit) has a track number (TN: Track). You need to know the IP address and UDP port number. This information (IP address and UDP port number) is used to compress the header of the tactical datalink message to be transmitted. Also, the Version, Service type, Time to Live (TTL), and Protocol fields in the IP header are not transmitted because they are fixed values.

3 is a compression header format generated for transmitting tactical data link messages in a network in the compressor of the present invention, and illustrates a format of a UDP / IP header compressed in the compressor.

Header Type (301): This field indicates a transmission purpose of the compressed packet generated by the compressor. The function implementation of the header according to each field value as 3-bit information is shown in Table 1.

Header Type Usage 000 Intra-Network
Tactical Datalink Message 001 Point-to-Point Data Packet 010 Connection Request 011 ACK 100 Block ACK Request 101 Block ACK Response 110 Gateway-Data Packet 111 Gateway-Block ACK Request

○ Intra-Network Tactical Datalink Message: This value is for the tactical data link message transmission function in the network.

○ Point-to-Point Data Packet: It is a server / client structure of point-to-point node. It is a value for application data packet transmission function.

○ Connection Request: It is the value to set up the connection between nodes to create the server / client structure of the point-to-point node.

○ ACK: It is a value for transmitting ACK when establishing connection and implementing Adaptive Packing mode.

○ Block ACK Request: It is a value for requesting block response during transmission of application data packet of server / client structure between nodes.

○ Block ACK Response: A value for the response to the block response request.

○ Gateway-Data Packet: It is a value for transmitting a data packet transmitted from a gateway to a specific node in a network connection structure.

○ Gateway-Block ACK Request: It is a value for a block response request after a gateway sends a data packet to a specific node in a network connection structure.

More Fragment 302: Set to 1 when the payload 305 of the compressed packet generated by the compressor as one bit is fragmented and connected to a packet transmitted in the next time slot.

○ Message Length 303: Information represented by 3 bits and has a value of 0 to 7. The Link-16's Fixed Format message consists of 1-8 words. Therefore, this field can be restored by inferring the total length values of the IP header and the UDP header by expressing the number of words of the tactical data link message using 3-bit information. The value of this field is applied from 1 to 8 using the value of 0 ~ 7.

Fragment Point 304: Displays 10-bit information and indicates the boundary point when there are two messages transmitted in the TDMA time slot. When a tactical data link message is transmitted by compressing a header, when the message is transmitted to the next slot due to the header area, the boundary point between the messages is indicated using 10-bit information. This allows for the use of 840 bits for data transfer in the case of Packed-4 Single Pulse with a Link-16 Packing structure.

Payload 305: This field means the payload of the compressed packet.

4 is a compression header format when the Header Type 301 of FIG. 3 is set to 000 and the More Fragment 302 is set to 1. FIG.

That is, this header is used when fragmentation of payload of a compressed packet transmitted in a TDMA time slot following transmission of a tactical data link message in an intra-network is connected. The compressed header of FIG. 4 includes Header Type, More Fragment, and Payload, and the fields of the 3-bit message length 303 and 10-bit fragment point 304 of FIG. It is used to increase the transmission efficiency.

5 is a diagram illustrating a compression process and a restoration process of a UDP / IP header using the headers of FIGS. 3 and 4. FIG. 5 shows the classification of each field when compressing the UDP / IP header to FIG. 3 before compression.

Source Port Number (501), Destination Port Number (502), Source Address (515), and Destination Address (516): When a Link-16 TDMA network is established, each unit is assigned a track number (TN: Track) of the participating node. Assume that the UDP / IP address and port number corresponding to the number) are shared. Therefore, this field is information that is not included in the compressed header component. Link-16 units that receive the compressed header later recover the UDP / IP address and port number using the source track number.

Version (505), Header Length (506), Service Type (507), TTL (Time To Live) 512, Protocol (513): This field is a value that is always transmitted at a fixed value when transmitting a packet. Therefore, this information is information not included in the compression header component.

○ Version: It transmits based on IP version 4 (IPv4).

○ Header Length: Transmit based on 20 bytes without IP header option.

○ Service type: Do not set QoS (Quality of Service) related parameters.

TTL (Time to Live): Set to 1 because it is a single hop in a wireless situation.

○ Protocol: The upper layer assumes UDP and transmits.

Identifier (509), Flag (510), Fragment offset (511): Fields related to fragmentation in the network layer. Since the compression protocol itself performs the fragmentation related function, the fragmentation function at the IP network layer is not used.

UDP Length (503), Total Length (508): indicates the size of the payload to include. Using the UDP Length 303 of FIG. 3, the header value is restored to the header value before compression. In the case of the fixed format message of the Link-16, it is composed of 1 to 8 words, so that it is matched with a value of 0 to 7 of the Message Length 303. If the value of the Message Length 303 is 2, it indicates that the message is composed of three words, and thus, the packet has a payload of 210 bits.

○ UDP Checksum (504), Header Checksum (514): Detects packet errors in the Transport Layer and the Network Layer, and is not included in the Compressed Header. Packet error is detected depending on 12-bit CRC (Cycle Redundancy Check) in the physical layer.

FIG. 6 is a diagram illustrating an embodiment of in-network tactical data link message transmission using the headers of FIGS. 3 and 4.

In the present embodiment, the Link-16 unit 601 of the fighter generates an arbitrary tactical data link message composed of words such as 3, 6, 5, 3, etc., and the packing structure is a standard double pulse ( Standard Double Pulse).

Referring to the compression header, the header type 603 is set to 000 because the tactical data link message is transmitted in the network. More Fragment 604 and Fragment Point 606 are set to 0 since the current packet is a packet that is initially transmitted. The Message Length 605 sets the value of the decimal number 2 since the currently transmitted tactical data link message is a 3 word message. In this case, the size of the payload to be transmitted is 193 bits except for the header size 17 bits from 210 bits, which is the transmission size of the standard double pulse. Receiving this packet, the Link-16 unit 602 of the battleship recognizes that it is the first message with reference to More Fragment (604) and Fragment Point (606), and refers to the message length (605). Find out that this is a message. Therefore, a buffer of 210 bits is configured (609), 193 bits transmitted in advance are stored (610), and the remaining portion (Empty) is waited (611).

The subsequent transport packet is a tactical datalink message consisting of six words (420 bits), so the Link-16 unit 601 of the fighter sets the value of decimal 5 in the Message Length 614. In addition, a value of decimal 17 is set in the Fragment Point 615 indicating a position from the header to distinguish the 17-bit information of the tactical datalink message that has not been transmitted in the previous time slot and the currently transmitted message. do. The Link-16 unit 602 of the battleship, which received this, stores the 17-bit information from the header in the buffer of the previous tactical data link message with reference to the Fragment Point 615 value, completes 619, and transmits the information to the higher layer. In operation 625, the message 610 recognizes that the size of the currently transmitted tactical data link message includes 6 words, and stores 176 bits, which is the currently transmitted payload value, in the 420-bit buffer. Subsequent transmission packets have 244 bits (420-176 = 244) of message information that could not be transmitted in the previous timeslot. To send this, one or more timeslots are required. Therefore, set the field value of More Fragment (621) to 1. All subsequent header field values are converted into payloads. Therefore, the payload of 206 bits in total is transmitted 624, resulting in a higher transmission efficiency. The link-16 unit 602 of the battleship, which receives the transmission, performs a procedure of storing all payload information in the previous buffer by referring to the value of More Fragment 621 (627).

7, 8, and 9 are compressed header formats used for point-to-point IP server / client data packet transmission.

7 is a compression header format for connection request used when transmitting a point-to-point IP server / client data packet. The Connection Request message format is an IP server in which the Link-16 unit 203 of the fighter of FIG. 2 communicates with the IP server of the Link-16 unit 207 of the military command / corporation (ASOC), which is an intranet unit, or is a manganese unit. When trying to communicate with 210, the first to transmit.

○ Header Type 701: indicated by 3-bit information, indicating the purpose of transmission of the compressed packet generated by the compressor.

More Fragment 702: Displayed as 1 bit information and set to 1 when the payload of the compressed packet generated by the compressor is fragmented and connected to the packet transmitted in the next time slot. .

○ Destination Index (703): Displayed as 5-bit information and used as a field for transmitting its own transmission information from the transmitter to the receiver. That is, if the Link-16 unit 203 of the fighter of FIG. 2 completes the connection establishment with the IP server 210 by setting the Destination Index 703 field to 1, the Link-16 unit 203 of the fighter in the future is the Destination. The IP server 210 receives a point-to-point data packet that transmits by setting the index to 1. This method has the advantage of not having to use a track number (TN) or IP address for each compressed packet.

Destination Track Number (703): Displayed as 15-bit information, sets the track number of the unit for which you want to establish a connection.

○ Destination IP Address (705): Displayed as 32-bit information, sets the IP address of the unit to which you want to establish a connection.

Destination UDP Port Number (706): Displayed as 16-bit information, sets the UDP port number of the unit to which you want to establish a connection.

8 is a compressed header format for ACK transmission used when transmitting a point-to-point IP server / client data packet.

Header Type (801): This is indicated by 3-bit information and indicates the purpose of transmission of the compressed packet generated by the compressor.

More Fragment 802: Displayed as 1 bit information and set to 1 when the payload of the compression packet generated by the compressor is fragmented and connected to the packet transmitted in the next time slot. .

Destination Track Number (803): Displayed as 15-bit information, sets the track number of the unit for which you want to establish a connection.

○ Destination IP Address (804): Displayed as 32-bit information, set the IP address of the unit to which you want to establish a connection.

○ Destination UDP Port Number (805): Displayed as 16-bit information, sets the UDP port number of the unit to which you want to establish a connection.

Block ACK Bitmap 806: In the present invention, a method for improving transmission efficiency by using a block response when transmitting a point-to-point data packet is used. The maximum number of blocks that can be used is 128 bits. When the header type 801 sets and transmits a block response request function 100, the block response is performed using the bitmap accordingly.

9 is a compressed header format for payload transmission used when transmitting a point-to-point IP server / client data packet.

Header Type 901, which is expressed as 3-bit information and indicates the purpose of transmission of the compressed packet generated by the compressor.

○ More Fragment (902): Displayed as 1-bit information and set to 1 when the payload of the compressed packet generated by the compressor is fragmented and connected to the packet transmitted in the next time slot. .

○ Adaptive Packing Mode (903): Displayed as 1-bit information, this method improves the transmission efficiency by changing the transmission packing structure according to the channel conditions when transmitting point-to-point data packets.

○ Destination Index (904): Displayed as 5-bit information, used as a field for transmitting its own transmission information from the transmitter to the receiver. For example, the Link-16 unit of the fighter plane sets this field to 1 to communicate with the IP server. After the connection has been established, a point-to-point data packet is received by the IP server, eliminating the need to use a track number (TN) or IP address per compressed packet.

Sequence Number (905): Represented as 7-bit information, information implemented to use the block response function of the transmitted packet. Starts at 0 and increases to a maximum of 127. When the block response is received, it is set back to zero.

○ End Point (EP) (906): Indicated by 10-bit information, when the data packet is transmitted fragmented (fragmentation), the last compressed packet has a value that is stored to a specific position in the payload (906) , Information displayed at this time. This field is displayed when a block response request is set in the header type 901.

The compressor is characterized in that the transmission efficiency is increased without using an additional Fragment 302 in the intra- and inter-network communication structure of the TDMA network.

The compressor uses the More Fragment 302, Message Length 303, and Fragment Point 304 to transmit UDP Length (UDP) lengths of UDP and IP headers when transmitting a tactical data link message in a network connection of a TDMA network of Link-16 units. 503), Total Length 508, Identifier 509, Flag 510, and Fragment Offset 511 fields are compressed.

The compressor, when point-to-point connection, the UDP Length (503), Total Length (508) of the UDP and IP header using More Fragment (902), End Point (906) in general data packet transmission Field).

When the point-to-point connection is performed, the compressor compresses the IP address 516 and UDP port number 502 fields for each packet by using the destination index 703 through connection establishment. .

The compressor is characterized in that when using a point-to-point connection, the Adaptive Packing Mode (903) to increase the data transmission efficiency by changing the packing structure according to the channel conditions.

Tactical Data Links (TNs) are assigned to track numbers (TNs) when configuring tactical data links such as AWACS, air force radars, fighter aircraft, aircraft, helicopters, aircraft carriers, ships, and ground combat equipment. 16) In the case of intra-network of a Link-16 TDMA network, while the units know IP addresses and UDP port numbers corresponding to different track numbers (TN: Track Number), Send the tactical data link message through the TDMA network using the track number (TN), which is the physical address of the participating unit, and in the case of inter-network, each participating unit of the Link-16 (Link-16 unit). Compress and decompress UDP / IP by using Compressor and Decompressor using IP address of IP address, and point-to-point server through Compressor and Router through message using compressed header. / Client connection, ACK Transmission and transmission and reception of data packets are performed.

FIG. 10 is a diagram illustrating an embodiment of in-network connection setup using the compressed header format of FIGS. 7 and 8.

The Link-16 unit 1001 of a fighter with a track number will first establish a connection with the Link-16 unit 1002 with a track number 99 for point-to-point data packet transmission. do. Header Type 1003 is set to 010, which is a connection request type. And, the Destination Index 1005 is set to 0 to distinguish the receiver in the future data packet transmission.

Link-16 unit (Link-16 unit having the source track number) 1001 of the fighter is the link-16 unit (destination Link-16 unit) 1002 of the battleship information of the destination unit [Destination Track Number (1006), Destination IP Address (1007), Destination UDP Port number (1008)] to send a Connection Request message to the Link-16 unit 1002 of the battleship and start the timer. do.

The Link-16 unit 1001 of the fighter retransmits the connection request message according to the timeout & retransmission mechanism when the predetermined time of the timer expires before the ACK (Acknowledgement) message arrives from the Link-16 unit 1002 of the battleship. retransmit).

The Link-16 unit 1002 of the battleship that received this Connection Request message from the Link-16 unit 1001 of the fighter plane is set to 011, which is an ACK type in the Header Type 1009, and is connected to the connection response. Send a message to the Link-16 unit 1001 of the fighter. Through this process, connection establishment for transmitting and receiving point-to-point data packets in a network of a TDMA network is completed.

FIG. 11 is a diagram illustrating an embodiment of establishing a network connection between a TDMA network and an IP network using the compression header formats of FIGS. 7 and 8.

In one embodiment, the Link-16 unit 1101 of the fighter with track number 83 is an IP address (e.g., 234.111) mapped to a preset destination index number (e.g., 1) existing in an external network through the gateway 1102. 38.29 transmits a Connection Request packet to the gateway for data packet transmission with the assigned IP server 1103, and drives a timer.

Previously, the connection request type 010 is set in the header type 1104 of the compressed header included in the connection request message, and the destination index 1106 is set to a decimal number (eg, DI = 1) to distinguish the destinations. Set it. Destination Track Number 1107 inputs the track number TN of the gateway 1102 in charge of the transmission function to the external network. This designates a track number (TN) for the purpose of identifying gateways when there are multiple gateways in the network of a Link-16 TDMA network. The destination IP address 1108 and the destination UDP port number 1109 input information of an IP server for which the actual data packet is to be transmitted.

The Link-16 unit 1001 of the fighter retransmits the connection request message according to a timeout & retransmission mechanism when a predetermined time of the timer expires before the ACK (Acknowledgement) message from the gateway 1102 arrives. (retransmit).

The gateway 1102 receiving the connection request message transmits a connection response packet to the link-16 unit 1001 of the fighter to indicate that the connection setup is made without a problem. Thereafter, the Link-16 unit 1101 of the fighter receives the data packet transmitted by the specific Destination Index = 1 and is mapped by the gateway 1102 to the destination IP address and forwards it to the destination IP server 1103 through the router.

12 is a diagram illustrating an embodiment of data packet transmission after completing intra-network or inter-network connection setting using the compressed header format of FIGS. 7 and 8. The Link-16 unit (Link-16 unit of the fighter) 1201 having the source track number (TN) 1201 finishes the connection setup with the gateway 1202, and then sets the Header Type 1203 to point-to-point for data packet transmission. Point-To-Point) Set to 001, the data packet transmission type. Also, since the end point 1207 is a start packet of data, the end point 1207 is set to 0 to transmit a data packet.

In this embodiment, the Adaptive Packing Mode 1205 is set to zero. The Link-16 unit 1201 of the fighter that has finished transmitting all data packets with the sixth compressed packet sets the header type (1228), the block response request packet type, in the last sixth packet, and then sets the information storage location of the last packet. A designated End Point 1233 is set to transmit a Block ACK Request message to the gateway 1202, and a timer is driven.

If the link-16 unit 1201 of the fighter expires a predetermined time of the timer before the block ACK response message arrives from the gateway 1202, the block-16 unit 1201 requests a block ACK request according to the timeout & retransmission mechanism. ) Retransmit the message.

The gateway 1202 receives six compressed packets allocated with sequence numbers from 0 to 5 as fragments, and indicates that the second and fifth packets at positions 1234 and 1235 have failed. A Block ACK Response message is transmitted to the Link-16 unit 1201 of the fighter based on the Sequence Number.

The gateway 1202 sets the Header Type 1238 of the Block ACK Response message to 101 representing the block response, and sets the Block ACK Bitmap 1243 to the second and fifth packet errors. Information is displayed as 1 (010010) and transmitted to the Link-16 unit 1201 of the fighter.

The Link-16 unit 1201 of the fighter retransmits the second and fifth packets (sequence numbers 1 and 4) with transmission errors to the gateway 1202.

FIG. 13 is a diagram illustrating a compressed header format transmitted from a gateway to a Link-16 unit when a point-to-point network is connected.

○ Header Type (1301): Displayed as 3-bit information, set to 110, the gateway transmission format, and transmitted.

○ More Fragment (1302): Displayed as 1-bit information and set to 1 when the payload of the compression packet generated by the compressor is fragmented and connected to the packet transmitted in the next time slot. .

○ Adaptive Packing Mode (1303): Displayed as 1-bit information and used to improve transmission efficiency by changing the transmission packing structure according to channel conditions when transmitting point-to-point data packets.

○ Destination Track Number (1304): Displayed as 15-bit information, set the track number of the Link-16 unit to be transmitted. The data packet transmitted from the gateway is transmitted to the destination in a point-to-point manner without establishing a connection. At this time, the classification of the receiving unit is confirmed by the destination track number.

Sequence Number (1305): 8-bit information, which is implemented to use the block response function of the transmitted packet. It starts at 0 and increases up to 127. When the block response is received, it is set back to zero.

○ End Point (1306): Indicated by 10-bit information, when the data packet is fragmented and transmitted, this field is a field that appears when a block response request is set in the Header Type 1301, and the Header Type (1301). ) Is used to indicate the storage location of the last data packet when the transfer type is set to 111.

14 is a diagram illustrating an embodiment of an adaptive packing mode for increasing transmission efficiency according to channel characteristics when transmitting tactical data and general data between networks. The Link-16 unit (Link-16 unit having the source track number (TN)) 1401 of the fighter transmits data to the gateway 1402 and sets the Adaptive Packing Mode 1405 to 1 to increase transmission efficiency. send. At this time, the Link-16 unit 1401 and the gateway 1402 of the fighter use the Adaptive Packing Mode. The Link-16 unit 1401 of the fighter sends N (STD) standard double pulses (STD) 1433, 1434, and 1435 to the gateway 1402 and starts a timer. After applying the timeout & retransmission mechanism, it waits for an acknowledgment (ACK) 1436 from the gateway 1402.

If the gateway 1402 receives the promised N standard double pulse (STD) data, and an error of less than K (an integer satisfying the K≤N condition) occurs, the gateway 1402 sends an ACK (Acknowledgement) to the fighter's Link-16. After transmitting to the unit 1401, the data packing structure is increased. In an embodiment of the present invention, N = 3, K = 1, and the packing structure starts with a standard double pulse (STD).

The Link-16 unit 1401 of the fighter receiving the ACK from the gateway 1402 increases the packing structure with the Gateway 1402 to a Packed-2 Double Pulse, thereby increasing the data transmission speed. .

The Link-16 unit 1401 of the fighter sends N standard double pulses (STDs) 1437, 1438, and 1439 to the gateway 1402 and starts a timer to time out and retransmit. After applying the & retransmission mechanism, it waits for an acknowledgment (ACK) 1440 from the gateway 1402.

As described above, the present invention has been described in detail through preferred embodiments, but the present invention is not limited thereto, and various changes and applications are apparent to those skilled in the art without departing from the technical spirit of the present invention. Accordingly, the true scope of protection of the present invention should be construed according to the following claims, and all technical ideas within the scope of the same should be construed as being included in the scope of the present invention.

201: AWACS Link-16 Unit 202: Air Force Radar Link-16 Unit
203: Fighter Link-16 Unit 204: Control Link-16 Unit
205: Link Link-16 Unit with SM-2
206: Gateway of Fleet Command Link-16 unit
207: Military Command / Army IP Server 209: Router
210, 211: IP server

Claims (23)

In the header compression system for the IP service in the tactical data link,
A compressor for compressing the UDP and IP headers added to the tactical data message to generate a compression header, and a restorer for restoring the message including the compressed header, and an airborne warning and control (AWACS). System, Air Force Radar, Fighter, Aircraft, Helicopter, Aircraft Carrier, Ship, Ground Fighting Equipment, etc. are assigned a unique Track Number (TN), which transmits data packets in a point-to-point IP server / client manner. A tactical data link unit;
A gateway for converting a multiple access protocol to an IP protocol through each tactical data link unit to which the track number is assigned and the multiple access network;
A router coupled to the gateway and routing data packets from a source IP address to a destination IP address; And
An IP server connected to the router and receiving data packets in a point-to-point manner;
In case of Intra-Network of TDMA network, message is transmitted using track number (TN) which is the physical address of each participating unit, and in case of Inter-Network, it uses IP address of each participating unit. Send a message,
Each tactical data link unit to which the track number is assigned is configured by the AWACS, the air force radar, the fighter aircraft, the aircraft, the helicopter, the aircraft carrier, the ship, and the ground combat equipment. At the time of knowing the IP address and UDP port number corresponding to different track numbers (TNs), a tactical data link message is transmitted through the multi-access network, and a point-to-point server / client The header compression system for the IP service in the tactical data link, characterized in that the connection setting, ACK transmission, data transmission and reception in a manner. delete The method of claim 1,
The physical layer and the data link layer of the tactical data link unit and the gateway transmit a tactical data link message composed of standard double pulses to a destination through a TDMA network, and the network layer and the transport layer transmit IP and UDP. And the IP service in the tactical data link, wherein the tactical data link message passing through the network layer is compressed in a compression layer, which is additional information generated from a UDP / IP layer. Header compression system. The method of claim 3,
The standard double pulse is composed of S (Sync), Time Refinement (TR), Header (H: Link-16 Header), and Data (D1: Data), and the data (D1: Data) is a compression header (Compression). Header) / Word1 / Word2 / Word3 Header compression system for the IP service in the tactical data link. The method of claim 3,
The compressed header is included in the tactical data link message (210 bits), and the header is added to the tactical data link message through the existing data link layer by the size of the compressed header, and then channel encoding is performed in the physical layer. After the (Channel Coding) process, the header compression system for the IP service in the tactical data link, characterized in that transmitted through the time slot through the TDMA network. The method of claim 5,
The coding in the physical layer of the tactical data link network includes parity bits for controlling transmission errors in transmission data, RS encoding, interleaving, and cyclic code shift keying (CCSK). , PN coding, modulation, header compression system for the IP service in the tactical data link characterized in that the transmission and reception of the tactical data link message in a packing process using a standard double pulse (STD) . The method of claim 1,
The compressed header,
In the compression header format generated for the transmission of the tactical data link message in the network indicating the format of the UDP / IP header is compressed in the compressor,
3-bit information (000: Intra-Network, Tactical Datalink Message, 001: Point-to-Point Data Packet, 010: Connection Request, 011: ACK, 100: Block ACK Request, 101: Block ACK Response, 110: Gateway-Data Packet, 111: Header-Block ACK Request (Header Type) indicating a transmission purpose of the compression packet generated in the compressor;
More Fragment, which is indicated by 1 bit and is set to 1 when the payload of the compressed packet generated by the compressor is fragmented and connected to the packet transmitted in the next time slot;
Displayed as 3-bit information, having a value of 0-7, the fixed format message consists of 1-8 words, and expresses the number of words of the tactical data link message using 3-bit information. Message Length for inferring and restoring Total Length values of the header and the UDP header;
A Fragment Point, which is displayed as 10-bit information and indicates a boundary point when two messages are transmitted in the split access time slot when the tactical data link message is transmitted by compressing a header; And
Payload which means payload of compressed packet;
Header compression system for IP service in the tactical data link comprising a. The method of claim 7, wherein
The compression header is a compression header format when the header type is set to 000 and the more fragment is set to 1, and the compression header is transmitted in a split access timeslot following transmission of a tactical data link message in an intra-network. A header compression system for an IP service in a tactical data link, which is used when fragmentation of a payload of a packet is connected, and includes a header type, a more fragment, and a payload. The method of claim 1,
When transmitting the point-to-point IP server / client data packet, the compression header format for connection request is
A header type represented by 3-bit information and indicating a transmission purpose of the compressed packet generated by the compressor;
More Fragment, which is expressed as 1 bit information and is set to 1 when the payload of the compressed packet generated by the compressor is fragmented and connected to a packet transmitted in a next time slot;
It is displayed as 5-bit information and is used as a field for transmitting its transmission information from the transmitter to the receiver. For example, after the fighter unit sets this field to 1 and establishes a connection with the IP server, point-to-point (point- a destination index that does not require a track number (TN) or IP address per compressed packet by using a method in which an IP server receives a to-point data packet;
Destination Track Number, which is displayed as 15-bit information and sets a track number of a unit to which connection is to be set;
A Destination IP Address, displayed as 32-bit information and setting an IP address of a unit to which connection is to be established; And
Destination UDP Port Number, which is displayed as 16-bit information and sets a UDP port number of a unit to which connection is to be established;
Header compression system for IP service in the tactical data link comprising a. The method of claim 1,
When transmitting the point-to-point IP server / client data packet, the compression header format for ACK transmission is
A header type, expressed as 3-bit information and indicating a transmission purpose of the compressed packet generated by the compressor;
More Fragment, which is expressed as 1 bit information and is set to 1 when the payload of the compressed packet generated by the compressor is fragmented and connected to a packet transmitted in the next time slot;
Destination Track Number, which is displayed as 15-bit information and sets a track number of a unit to which connection is to be set;
A Destination IP Address, displayed as 32-bit information and setting an IP address of a unit to which connection is to be established;
Destination UDP Port number, which is displayed as 16-bit information and sets a UDP port number of a unit to which connection is to be established; And
When transmitting a point-to-point data packet, the maximum number of blocks that can be used as a method of increasing the transmission efficiency by using a block response is 128 bits. When the header type is set to 100, the block response request function is transmitted. Block ACK Bitmap for performing a block response using the bitmap accordingly;
Header compression system for IP service in the tactical data link comprising a. The method of claim 1,
The compression header format for payload transmission used when transmitting the point-to-point IP server / client data packet is
A header type, expressed as 3-bit information and indicating a transmission purpose of the compressed packet generated by the compressor;
More Fragment, which is expressed as 1 bit information and is set to 1 when the payload of the compressed packet generated by the compressor is fragmented and connected to a packet transmitted in the next time slot;
Adaptive Packing Mode, which is expressed as 1-bit information and used as a method of increasing transmission efficiency by changing a transmission packing structure according to channel conditions when transmitting a point-to-point data packet;
It is displayed as 5-bit information and is used as a field for transmitting its transmission information from the transmitter to the receiver. For example, after the fighter unit sets this field to 1 and establishes a connection with the IP server, point-to-point (point- a destination index that does not require a track number (TN) or IP address per compressed packet by using a method in which an IP server receives a to-point data packet;
A sequence number indicated by 8 bits and implemented to use a block response function of a transmitted packet, having a value increasing from 0 to 127, and set back to 0 when a block response is received; And
When the data packet is displayed as 10 bits and is fragmented and transmitted, it has a value stored in the last compressed packet to a specific position in the payload, and is displayed at this time, and the block response request is set in the header type. End Point (EP) which is set when appearing;
Header compression system for IP service in the tactical data link comprising a. The method of claim 1,
The compressor includes:
The header compression system for the IP service in the tactical data link, characterized in that to increase the transmission efficiency without the additional process using the More Fragment (302) in the intra- and inter-network communication structure of the TDMA network. The method of claim 1,
The compressor includes:
When transmitting a tactical data link message in the network connection of the TDMA network, UDP and IP header UDP length (503), Total Length (508) using the More Fragment (302), Message Length (303), Fragment Point (304) And a header compression system for the IP service in the tactical data link, characterized by compressing the Identifier (509), the Flag (510), and the Fragment Offset (511) fields. The method of claim 1,
The compressor includes:
Tactical data characterized by compressing the UDP Length (503) and Total Length (508) fields of the UDP and IP headers using the More Fragment (902) and End Point (906) in a point-to-point connection. Header compression system for the IP service on the link. The method of claim 1,
The compressor includes:
In the point-to-point connection, header compression for the IP service in the tactical data link is characterized by compressing the IP address 516 and UDP port number 502 fields for each packet using the destination index 703 through connection establishment. system. The method of claim 1,
The compressor includes:
In the point-to-point connection, the header compression system for the IP service in the tactical data link, characterized by using an Adaptive Packing Mode (903) to increase the data transmission efficiency by changing the packing structure according to the channel conditions. In the header compression method for the IP service in the tactical data link,
When constructing tactical data links such as AWACS, air force radars, fighters, aircraft, helicopters, aircraft carriers, ships, and ground combat equipment, tactical data link units assigned track numbers (TNs), While knowing the IP address and UDP port number corresponding to the other track number (TN: Track Number),
(a) In case of intra-network of a TDMA network, transmitting a tactical data link message through the TDMA network using a track number (TN), which is a physical address of each participating unit of the tactical data link. step; And
(b) In the case of a point-to-point inter-network connection between a TDMA network and an IP network, compress and restore UDP / IP by a compressor and a decompressor using the IP address of each participating unit of the tactical data link, Connection setting, a ACK transmission, and a data packet transmission / reception via a gateway and a router through a gateway and a router in a point-to-point server / client manner;
Including,
The step (b) may comprise: (b1) establishing an intra-network connection of a TDMA network using the compressed header; (b2) establishing a network connection between the TDMA network and an IP network using the compressed header; And (b3) transmitting data packets after completing the intra-network or inter-network connection using the compressed header;
Header compression method for the IP service in the tactical data link comprising a. delete The method of claim 17,
(B1) establishing an intra-network connection of a TDMA network using the compressed header
(b1-1) Header Type (1) for first establishing a connection for transmission of a unit 1002 having a destination track number and a point-to-point data packet from a unit 1001 having a track number (TN). Setting 1003) to 010, which is a connection request type, and setting a destination index 1005 to 0 to distinguish recipients in a future data packet transmission;
(b1-2) Information of the destination unit from the unit 1001 having the track number TN to the destination unit 1002 [Destination Track Number 1006, Destination IP Address 1007, Destination UDP Port number 1008] Transmitting a Connection Request message by inputting [], and driving a timer;
(b1-3) If a predetermined time of the timer expires before the ACK message arrives from the unit 1001 having the track number TN to the unit 1002 having the destination track number, timeout & retransmission is performed. retransmission of the connection request message according to a retransmission mechanism; And
(b1-4) In the destination unit 1002 which has received the connection request message from the unit 1001 having the track number TN, a connection response is set by setting the header type 1009 to 011, which is an ACK type. Transmitting a message to the unit 1001 having the track number (TN) to complete connection establishment for transmitting and receiving the point-to-point data packet in the TDMA network;
Header compression method for the IP service in the tactical data link comprising a. 20. The method of claim 19,
(B2) establishing a connection between the TDMA network and the IP network using the compressed header,
(b2-1) The connection request type is set to 010 in the header type 1104 of the compressed header included in the connection request message, the destination index 1106 is set to a decimal number to distinguish the destination, and the destination track number is 1107. Enter the track number (TN) of the gateway 1102 of the TDMA network, which is responsible for the transmission to the external network, and the destination IP address (1108) and the destination UDP port number (1109) are the IPs for which the actual data packet is to be transmitted. Inputting information of a server;
(b2-2) Data packet transmission from the unit 1101 having the track number TN to the IP server 1103 to which an IP address mapped to a preset destination index existing in an external network is allocated through the gateway 1102. Transmitting a Connection Request packet to the gateway for driving the timer;
(b2-3) retransmitting the connection request message according to a timeout & retransmission mechanism when a predetermined time of the timer expires before the ACK message arrives to the unit 1101 having the track number TN; And
(b2-4) A connection response packet is transmitted from the gateway 1102 that receives the connection request packet to the unit 1101 having the track number TN, thereby establishing a connection without a problem. The gateway 1102 receives a data packet transmitted from the unit 1101 having the track number TN to Destination Index = 1 and maps the data packet to the destination IP address to the IP server 1103 as the destination unit. Forwarding;
Header compression method for the IP service in the tactical data link comprising a. The method according to any one of claims 17, 19 or 20,
After completing the intra-network or inter-network connection setting using the compressed header, the step of transmitting a data packet (b3),
(b3-1) After establishing connection with the gateway 1202 in the unit 1201 having the track number TN, the header type 1203 is a point-to-point data packet for data packet transmission. Transmitting the data packet by setting the transmission type to 001, setting the adaptive packing mode 1205 to 0, and setting the end point 1207 to 0 since it is a start packet of data;
(b3-2) In the unit 1201 having the track number (TN), which has completed transmission of all data packets by multiple compression packets, 100 is set to Header Type 1228 which is a block response request packet type in the last packet. Setting an end point 1233 indicating the information storage location of the last packet, transmitting a block ACK request message to the gateway 1202, and driving a timer;
(b3-3) In the unit 1201 having the track number TN, if a predetermined time of the timer expires before the block ACK response message arrives from the gateway, a block request is made according to the timeout & retransmission mechanism. Resending ACK Request) message;
(b3-4) In the gateway 1202, six compressed packets allocated with sequence numbers from 0 to 5, which are fragments, are received, and sequence numbers of the received error packets 1234 and 1235 are received. Identifying and transmitting a Block ACK Response message to the unit 1201 having the track number TN in response to a Block ACK Request message;
(b3-5) The gateway 1202 sets the header type 1238 of the block ACK response message to 101 indicating a block response, and sends a packet to a block ACK bitmap 1243. Displaying information on a reception error as 1 (010010) and transmitting it to the unit 1201 having the track number TN; And
(b3-6) retransmitting a sequence number (No. 1, No. 4) of a packet having a transmission error from the unit (1201) having the track number (TN) to the gateway (1202);
Header compression method for the IP service in the tactical data link comprising a. The method of claim 17,
When connecting to a point-to-point network, the compressed header format transmitted from the gateway to the unit is
Header Type 1301, which is displayed as 3-bit information and is set to 110, which is a gateway transmission format;
More Fragment 1302, which is expressed as 1-bit information and is set to 1 when a payload of a compressed packet generated by the compressor is fragmented and connected to a packet transmitted in a next time slot;
Adaptive Packing Mode 1303, which is displayed as 1-bit information and used as a method of increasing transmission efficiency by changing a transmission packing structure according to channel conditions when transmitting a point-to-point data packet;
Displayed as 15-bit information, set the track number of the unit to be transmitted, and the data packet transmitted from the gateway is the destination track number in a point-to-point manner without establishing a connection. Destination track number 1304 for classifying and transmitting the information to a destination;
A sequence number 1305, which is expressed as 8-bit information and has a value starting from 0 and increasing to a maximum of 127 to use the block response function of the transmitted packet, and is set back to zero upon receiving the block response; And
When the data packet is fragmented and transmitted as 10-bit information, this field appears when a block response request is set in the Header Type 1301, and the transmission type of the Header Type 1301 is 111. An End Point 1306 indicating the storage location of the last data packet when set;
Header compression method for the IP service in the tactical data link comprising a. The method of claim 17,
(b4-1) When transmitting tactical data and general data between the network and the network of the tactical data link, the unit 1401 having the track number (TN) transmits data to the gateway 1402, and according to channel characteristics, The standard double pulse (STD) used as the data packing of N (N is a natural number of 1 or more) from the unit 1401 having the track number (TN) is set to 1 to increase the Send a standard double pulse (1433, 1434, 1435) to the gateway 1402, run a timer, and use the timeout & retransmission mechanism to send a response (ACK) 1436 from the gateway 1402. Waiting for;
(b4-2) The gateway 1402 receives the promised N standard double pulse (STD) data, and then receives less than K (an integer that satisfies the condition K≤N, eg N = 3, K = 1). If an error occurs, transmitting an ACK to the unit 1401 having the track number TN, and then raising a data packing structure using a standard double pulse (STD);
(b4-3) The unit 1401 having the track number TN received the ACK from the gateway 1402 together with the gateway 1402 converts the packing structure to Packed-2 Double Pulse. Increasing the data transfer rate; And
(b4-4) Transmitting N standard double pulses (STDs) 1437, 1438, and 1439 from the unit 1401 having the track number TN to the gateway 1402, driving a timer to timeout and Waiting for a transmission response (ACK) 1440 from the gateway 1402 after using a timeout & retransmission mechanism;
The header compression method for the IP service in the tactical data link further comprising.

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