KR100906098B1 - Communication method and device in communication system and recording medium for performing the method - Google Patents

Abstract

A recording medium, an apparatus and a method thereof in which a program for performing a fast communication method in a communication system are provided to maintain fast processing speed by minimizing the memory movement of data. A header divider(210) separates 3 layer PDU(Protocol Data Unit) according to an upper layer header and a 3-layer data. A header compressor(220) compresses the higher layer header. A transmission data storage module(230) stores 3 layer data. 2 layer section of a processing function manages the location information of the transmission data storage module. 2 layer control information processor produces 2 layer header. A transfer block generator outputs and generates a transmission block adding 2 layer header to the transmission packet data unit.

Description

Communication method and device in communication system and recording medium having recorded thereon a program for performing the method

The present invention relates to a communication method, an apparatus in a communication system, and a recording medium having recorded thereon a program for performing the method.

As the use of wired / wireless communication devices is becoming more common due to the development of communication technology, users of communication device want to receive stable and secure data transmission / reception service anytime and anywhere. Hereinafter, a process in which data to be transmitted and received between communication devices is transmitted according to a communication layer will be described briefly.

The communication layer may be viewed as representing some layer of the Open Systems Interconnection (OSI) reference model. The OSI reference model is a communication-related standard model established to facilitate connection between different types of communication devices, and is generally classified into seven layers.

In the seventh layer according to the OSI reference model, one layer (physical layer), two layers (data link layer), three layers (network layer, network layer), four layers (transport layer, transport layer) , Layer 5 (Session Layer, Session Layer), Layer 6 (Presentation Layer, Presentation Layer), and Layer 7 (Application Layer, Application Layer) is included. The role of each layer is briefly described as follows.

Physical Layer (Physical Layer) is responsible for the transmission of the bit stream coming down from the upper layer through the transmission medium as an electrical signal, Data Layer Layer (Data Link Layer) is a signal level data bits It is responsible for the transmission of the formed data block, and the synchronization problem of recognizing the start and end of the data block and the error problem of detecting and restoring errors. The third layer (Network Layer) constitutes an invisible logical link between the transmitting side and the receiving side, divides data into packets and transmits them, assembles them, and finds an optimal path for packet transmission. The state is responsible for providing routing functionality. The 4th layer (Transport Layer) establishes and maintains the connection between the user and the user, the computer and the computer, and is responsible for providing logical stability and uniform service between the transmission and reception systems, and the 5th layer (Session Layer). It establishes a session and plays a role of providing a synchronization function to facilitate a sequential flow of conversation. The sixth layer (presentation layer) is a layer that deals with the way data is represented, and serves to provide a standard interface that enables different data representations. The seventh layer (application layer) is a top layer. The user's application acts as a window into the network environment.

Briefly describing the data transmission process between the OSI seven layers, the packet generated in the seventh layer (application layer) passes through the fourth layer (transport layer) through the sixth layer (presentation layer) and the fifth layer (session layer), the session It divides and numbers the data from the layer into segments, adds error detection codes, controls the communication flow, and passes routing through the third layer (network layer) to find the optimal path for packet delivery to the destination. Will be performed. Through the second layer (data link layer), we will solve the synchronization problem and the error problem, and the packet will be delivered to the next layer, the first layer, and the packet will reach the destination via wired / wireless through the first layer (physical layer). .

In transmitting the data through the above-described process, the protocol corresponding to the second layer, decomposes and receives the data received from the upper layers of the three or more layers to the modem, and assembles the data received from the modem to the upper layer. That is, the data received from the upper layer is processed and delivered to the lower layer, and the data of the lower layer is processed and delivered to the upper layer.

Currently, communication systems are changing to an environment that needs to deliver not only voice but also data. One such communication system is Voice over Internet Protocol (VOIP) using the Internet. In the case of VOIP, the data transmitted through the communication system can be regarded as data conforming to the IP format.

In such a communication system, a single CPU handled the role of a protocol corresponding to the above-described two layers in software. However, in a communication environment that delivers such data, users want to transmit and receive faster and faster, and the amount of data to be transmitted and received is increasing. Therefore, the processing power that can be processed by a single CPU is approaching its limit.

In addition, since 50% or more of the IP data transmitted and received in the VOIP is information regarding a header, and only the rest is information related to voice or data desired by the user, there is a need to resolve such an irrationality.

In the present invention, the data transfer from the upper layer is processed in the second layer to minimize the memory movement of the data to maintain a fast processing speed, and to preserve the original data, it is easy to cope with the later change of information to optimize the memory usage The present invention provides a communication method, an apparatus, and a program for performing the method in a communication system.

The present invention provides a communication method, apparatus and program for performing the method in a communication system capable of high-speed data transfer by efficiently separating and compressing an IP header at a transmitting side and restoring and combining the compressed IP header at a receiving side. It is to provide.

Other objects of the present invention will be easily understood through the following description.

According to an aspect of the present invention, a transmission data conversion method, a reception data conversion method, and a recording medium for performing each method in a communication system are provided.

According to an embodiment of the present invention, a method of converting transmission data includes: (a) receiving an upper layer header separated from one or more three-layer PDUs; (b) compressing the higher layer header; (c) receiving location information about a location of a transmission data storage unit storing three-layer data from which the upper-layer header is separated from the three-layer PDU; (d) controlling to perform encryption by providing at least one location information storing the three-layer data and a corresponding compressed one or more upper layer headers; And (e) generating a transport block by adding a layer 2 header to the transport unit packet generated by performing the encryption, wherein the layer 2 may be a data link layer.

In the step (a), the upper layer header occupies a predetermined size in the three-layer PDU and may be separated by hardware logic.

In step (b), the upper layer header may be compressed by a robust header compression (ROHC) method.

Decomposing or assembling one or more three-layer data in order to generate the transmission unit packet corresponding to the size of the predetermined transport block may precede step (d).

The output transport block may be stored in a transmission memory in the data transmission unit.

Step (d) may be performed when a transmission interrupt from the data transmitter is detected.

Step (b) and step (c) may be performed simultaneously.

The layer 2 header may include at least one of a header for duplication check, a header for retransmission, a header for information on disassembly or assembly of a layer 3 PDU, and a header for information required for media access control.

In the received data conversion method according to another embodiment of the present invention, (a) a transmission unit packet in which a layer 2 header is separated from a transport block received through a network is decoded so that at least one compressed higher layer header and at least one layer 3 data are decoded. Receiving location information regarding a location stored in the received data memory; (b) restoring the higher layer header; (c) providing location information in which the restored upper layer header and corresponding layer 3 data are stored to generate a layer 3 protocol data unit (PDU) in which the restored upper layer header and the layer 3 data are combined; step; And (d) informing the control layer of the reception report for the three-layer PDU, wherein the second layer may be a data link layer.

Step (c) may include determining whether the layer 3 data decoded in step (a) is complete to recover the layer 3 PDU; If not complete, repeating step (a) for a transport block subsequently received via the network; And generating complete three-layer data using two or more incomplete three-layer data based on the two-layer header.

According to another aspect of the present invention, a transmission data conversion device and a reception data conversion device in a communication system are provided.

An apparatus for converting transmission data according to an embodiment of the present invention may include: a header separator configured to separate one or more three-layer PDUs into upper layer headers and three layer data; A header compression unit to compress the separated upper layer header; A transmission data storage unit for storing the separated three-layer data; A two-layer function processor for managing location information regarding the location of the transmission data storage unit in which the three-layer data is stored; A transmission unit packet by encrypting at least one layer 3 data read from the transmission data storage unit according to at least one upper layer header compressed by the header compression unit and corresponding position information received from the layer 2 function processing unit An encryption unit for generating a; A layer 2 control information processor for generating a layer 2 header to be added to the transmission unit packet; And a transport block generation unit configured to generate and output a transport block to which the layer 2 header is added to the transport unit packet, wherein the layer 2 may be a data link layer.

The header separator may be implemented in hardware logic to separate the upper layer header using a predetermined size in the three-layer PDU.

The header compression unit may compress the upper layer header by a robust header compression (ROHC) method.

The two-layer function processing unit may disassemble or assemble one or more three-layer data to generate the transmission unit packet corresponding to the size of the predetermined transmission block.

The output transport block may be stored in a transmission memory in the data transmission unit.

The encryption unit may perform encryption when a transmission interrupt from the data transmission unit is detected.

The layer 2 header may include at least one of a header for duplication check, a header for retransmission, a header for information on disassembly or assembly of a layer 3 PDU, and a header for information required for media access control.

According to another embodiment of the present invention, an apparatus for converting received data includes: a transport block breaker for separating a transport block received through a network into a layer 2 header and a transport unit packet; A decoder configured to decode the transmission unit packet into one or more compressed upper layer headers and one or more three-layer data; A reception data storage unit for storing the decoded three-layer data; A header decompressor for restoring the decoded upper layer header; A header combiner for generating a three-layer protocol data unit (PDU) by combining the upper layer header restored by the header decompressor and the three-layer data; And an upper layer processor configured to notify a control layer of a reception report for the three-layer PDU, wherein the second layer may be a data link layer.

The apparatus further includes a two-layer function processing unit for generating one complete three-layer data using two or more incomplete three-layer data, wherein the two-layer function processing unit subsequently receives the transmission through the network if one or more incomplete three-layer data exists. Other incomplete three layer data decoded using the block may further be used to generate complete three layer data.

Other aspects, features, and advantages other than those described above will become apparent from the following drawings, claims, and detailed description of the invention.

The communication method, apparatus and program for performing the method in the communication system according to the present invention can maintain the high processing speed by minimizing the memory movement of data in processing the data transmitted from the upper layer in the second layer. By preservation of the memory, it is easy to cope with the change of information later, and the memory usage can be optimized.

In addition, high-speed data transfer is possible by efficiently separating and compressing the IP header at the transmitting side and restoring and combining the compressed IP header at the receiving side.

As the invention allows for various changes and numerous embodiments, particular embodiments will be illustrated in the drawings and described in detail in the written description. However, this is not intended to limit the present invention to specific embodiments, it should be understood to include all transformations, equivalents, and substitutes included in the spirit and scope of the present invention. In the following description of the present invention, if it is determined that the detailed description of the related known technology may obscure the gist of the present invention, the detailed description thereof will be omitted.

Terms such as first and second may be used to describe various components, but the components should not be limited by the terms. The terms are used only for the purpose of distinguishing one component from another.

The terminology used herein is for the purpose of describing particular example embodiments only and is not intended to be limiting of the present invention. Singular expressions include plural expressions unless the context clearly indicates otherwise. In this application, the terms "comprise" or "have" are intended to indicate that there is a feature, number, step, operation, component, part, or combination thereof described in the specification, and one or more other features. It is to be understood that the present invention does not exclude the possibility of the presence or the addition of numbers, steps, operations, components, components, or a combination thereof.

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

In describing the embodiments of the present invention using the name of each layer, the first layer is defined as corresponding to the first layer of the OSI 7 layer. In addition, the second layer is defined as corresponding to the second layer (Data Link Layer) of the OSI 7 layer, but is further defined as performing a function for decomposition / assembly according to the transport block. In addition, three layers may be three or more layers of the OSI seven layers (that is, three layers (Network Layer), four layers (Transport Layer), five layers (Session Layer), six layers (Presentation Layer) and seven layers (Application Layer)). It is defined as corresponding to, but may also be referred to as a control layer or a higher layer.

1 is a view schematically showing a communication system according to an embodiment of the present invention, Figure 2 is a view showing the configuration of a transmission data conversion unit according to an embodiment of the present invention, Figure 3 is an embodiment of the present invention Is a flowchart illustrating a data conversion process of a transmission data converter according to the present invention.

Referring to FIG. 1, there is shown a transmitting terminal 100 and a receiving terminal 135 that transmit and receive data through a network.

The transmitting terminal 100 includes a data output unit 110, a transmitting data converter 120, and a data transmitter 130, and the receiving terminal 135 includes a data receiver 140 and a received data converter 150. And a data input unit 160. In addition, the transmitting terminal 100 and the receiving terminal 135 may further include components such as an input unit, a display unit, a control unit, etc. according to the functions provided therein, but the description thereof is omitted because it is somewhat distanced from the gist of the present invention. do.

As shown, the transmission data conversion unit 120 is located between the data output unit 110 for the upper layer (three or more layers) and the data transmission unit 130 for transmitting data through the network. Similarly, the reception data conversion unit 150 is located between the data input unit 160 for the upper layer (three or more layers) and the data reception unit 140 for receiving data through the network. Here, the data transmitter 130 and / or the data receiver 140 may be, for example, a modem.

Hereinafter, the configuration and processing operation of the transmission data converter 120 will be described with reference to FIGS. 2 and 3. As described below, in the present embodiment, the transmission data converter 120 is located in two layers, and receives data from three layers (or may be referred to as a control layer or a higher layer, which is the same below). Converts so that it can be transmitted through the transmitter 130. In addition, the reception data conversion unit 150 is also located in the second layer, and converts the data received through the data reception unit 140 to transfer to the third layer (or control layer or higher layer, which is the same below). do.

That is, the transmission data conversion unit 120 according to the present invention whether to encrypt the three-layer PDU or whether to encrypt the two-layer PDU added to the header already divided and assembled, the same goes from layer 2 to layer 1 Only the part that needs encryption in the previous step is characterized by performing encryption and outputting it. In the following description, only the case of encrypting and outputting a three-layer PDU will be described.

Referring to FIG. 2, the transmission data converter 120 may include a header separator 210, a header compressor 220, a transmission data storage 230, a location storage 240, a higher layer processor 250, It may be configured to include a two-layer function processing unit 260, a two-layer control information processing unit 270, an encryption unit 280, a transport block generator 290. Some of the illustrated components may be omitted, or a plurality of components may be integrated into one component, and one or more of each component may be implemented in the form of a software program.

The header separating unit 210 receives a three-layer PDU (Protocol Data Unit) (three-layer data PDU or a control-layer PDU or a higher-layer PDU or packet) from an upper layer, separates the header into three-layer data, and separates the separated three layer. The data is stored in the transmission data storage unit 230 and the separated header is provided to the header compression unit 220. Here, the 3 layer PDU may be data according to the format of IP (Internet Protocol), for example.

IP data is divided into a header and data, and can be classified into IPv4 and IPv6. In the case of IPv4, the size of the header can be identified by the first byte, and the size is 20 to 60 bytes. In the case of IPv6, the header size is 40 bytes and has a fixed size.

Therefore, the header separating unit 210 easily separates the header by using a constant size of the header in the device implemented with hardware logic in separating the three-layer PDU received from the upper layer to the header compression unit 220. It is possible to deliver.

The header compression unit 220 receives the header separated by the header separation unit 210 and performs compression. A part of compressing the received header into a desired form and may be implemented by hardware logic or a software program. The header compression unit 620 may use, for example, a Robust Header Compression (ROHC) scheme for header compression. In addition, header compression by various compression schemes is possible, and header compression by compression techniques to be developed later may be applied to the present invention.

Header compression compresses a header that occupies a large amount of three-layer PDUs, and then encrypts the encryption unit 280 to be described later, so that a relatively large amount of 3 is transmitted to the transmission unit packet to be transmitted through the data transmission unit 130. In order to include the hierarchical data, it is possible to build a faster wireless environment and error-resistant wireless environment.

The transmission data storage unit 230 is a space for storing three-layer data except for the header separated by the header separation unit 210 among the three-layer PDUs. The transmission data storage unit 230 may be a physical memory such as a dynamic random access memory (DRAM) or a static random access memory (SRAM).

The transmission data storage unit 230 maintains the storage state of the three-layer data stored in the two-layer to facilitate response in the case of retransmission. However, the stored three-layer data may be deleted when necessary (for example, when a reception response from the reception terminal 135 is received), so that the storage space may be managed in a usable state. In addition, the address provided by the component itself to perform the processing, without the need to move or store or copy the three-layer data stored in the transmission data storage 230 for processing such as the encryption unit 280 to another storage or memory It also has the feature that data can be processed at high speed by connecting to information and using the corresponding data.

The location storage unit 240 is a storage space in which location information on which address location of the transmission data storage unit 230 is stored data to be transmitted is stored. The location information stored in the location storage unit 240 may be information interpreted by the higher layer processing unit 250. The location information includes at least one of an address where the corresponding data is stored in the transmission data storage 230 and a size of the corresponding data.

Here, the actual data is stored in the transmission data storage unit 230, the position storage unit 240 manages the storage location of the actual data. In this embodiment, to convert the PDU of the upper layer in the second layer and transfer it to the data transmission unit 130, since a large amount of data of the PDU of the upper layer takes a lot of time to process in software, This is to reduce the processing time by hardware processing.

The upper layer processor 250 supports functions supported by three layers (or higher layers or control layers), that is, mobility management, transmission control, session management, and the like, and performs various parameter management for controlling two layers or less. . For example, the upper layer processor 250 may perform a control management function for the currently used encryption algorithm, key value maintenance, and various functions supported by the second layer.

The second layer function processing unit 260 functions to disassemble / assemble data PDUs in charge of the second layer, control retransmission using ARQ (Automatic Retransmission Request), HARQ (Hybrid ARQ), and media access control for physical layer resource management. Do this.

The decomposition / assembly of the PDUs in the two-layer function processor 260 will now be described. Although the second layer is allocated a transmittable resource (for example, a passage for communication) from the upper layer, the size of the three-layer PDU stored in the header separator 210 may be different from the amount of allocated resources. Accordingly, the two-layer function processing unit 260 may decompose and / or assemble and transmit the data stored in the transmission data storage unit 230 to an appropriate size in order to transmit the maximum size data using the allocated resources. Although described below with reference to the related drawings, the two-layer function processing unit 440 included in the reception data conversion unit 150 of the reception terminal 135 is decomposed and / to reduce the received data to the original three-layer PDU size Or perform the assembly process.

Retransmission control in the two-layer function processing unit 260 will be described below. There are three types of data transmission in the second layer: a mode without control, a mode for control only, and a mode for control and transmission confirmation. ARQ is an algorithm that defines a transmission confirmation method used in a control and transmission confirmation mode. When specific data is transmitted from the transmitting terminal 100, the receiving terminal 135 receiving the data decodes the data and confirms it. This is a method for confirming transmission by sending an ACK message to the transmitting terminal 100. At this time, even if a certain time elapses after the transmission, if the ACK message is not received or a data reception error message (NACK) is received, the data is retransmitted. In contrast, HARQ is an algorithm to compensate for the shortcomings of ARQ, and means a method of helping to restore the retransmitted data later by storing the retransmitted data without discarding it. For example, when a certain data is first received, when a cyclic redundancy check (CRC) fails and a NACK message is sent, the receiving side stores the data without discarding it, and the next time the same data is received, the cyclic redundancy check results. Therefore, this data can be used to help restore. Therefore, the second retransmitted data can also reduce the number of retransmissions by restoring the original data by using the previously received data instead of requesting retransmission by sending a NACK message when a restoration error occurs.

Media access control for physical layer resource management in the layer 2 function processor 260 refers to a function of scheduling and multiplexing for efficiently using allocated resources. This is to enable the transmission and reception of the maximum size data for the allocated physical resource which is the ultimate purpose of the second layer.

The two-layer control information processing unit 270 generates header information generated in the two layers. Here, the data PDUs are assembled and / or disassembled to transmit the encrypted transmission unit packet at a time so that the header information is used as the header information for the transmission unit packet so as to enable efficient use of resources. It may also be called a packed header.

The bundle header (ie, layer 2 header) may be generated by gathering information necessary to perform the functions of the layer 2 itself in the layer 2, and may include a first header for redundancy check, a second header for retransmission, and a layer 3 PDU. One or more of a third header on information about decomposition / assembly, a fourth header on information required for media access control, and the like. The first header sequentially increases the number according to the input data such as a sequence number, for example, and transmits the same number so that the same number can be determined as a duplicate arrival. The second header corresponds to, for example, an acknowledgment message such as a retransmission number and an ACK / NACK. The retransmission number is sequentially increased every time transmission, and if the receiving side requests retransmission for a specific number or does not receive an ACK message from the receiving side for a predetermined time, data corresponding to the transmission number can be included and transmitted. The third header is for conveying information necessary for the receiver to interpret the disassembly or assembly performed at the second layer of the transmitter. The fourth header includes information necessary for media scheduling for multiplexing. This is to indicate what data is allocated to be transmitted to the resource used.

The two-layer control information processing unit 270 generates a packed header by combining one or more of the first header, the second header, the third header, and the fourth header so as to match the format according to the protocol, and then transmits the data storage unit 230. The data is transferred to the transmission memory 200 together with the data stored in the memory. Preferably, the layer 2 control information processing unit 270 may include a third header regarding information on decomposition / assembly of the layer 3 PDU, and may generate a control component that delivers information necessary for resource allocation. . This is because, in order to make maximum use of the limited resources, a process of combining and / or decomposing a plurality of layer 3 data into a transport block having a predetermined size is required.

The encryption unit 280 receives an input data stream, a key value used for encryption, a sequence number, and the like as inputs, and generates an output data stream that is a result of encryption. The key value and the sequence number are managed by one or more of the upper layer processing unit 250, the two layer function processing unit 260, and the two layer control information processing unit 270, and the encryption unit 280 is configured to the three layer data or transmission size. Layer 3 data may be provided to the encryption unit 280 as an input variable when encrypting the assembled and / or disassembled transmission unit packet to conform. The key value may be received and stored in advance through signaling of a higher layer before encryption is performed, and the sequence number may be changed to a new value for each input data. Key values and the like may be shared between the transmitting terminal 100 and the receiving terminal 135, and if not shared, the key values may be transmitted and received to each other as separate data. The input data stream includes one or more headers compressed by the header compression unit 220 and one or more three-layer data stored in the transmission data storage 230.

The transport block generation unit 290 generates a transport block by combining the bundle header generated by the layer 2 control information processing unit 270 and the layer 3 data or transmission unit packet encrypted by the encryption unit 280. If generation of the transport block is completed by the encryption unit 280, the transport block generator 290 may be omitted. The generated transport block is stored in the transmission memory 200 to enable data transmission by the data transmitter 130. The transmission memory 200 may be included as one component of the transmission data converter 120 or may be included as one component of the data transmitter 130. In addition, the transport block generator 290 may also be included as a component of the data transmitter 130.

In the present embodiment, a component for processing a simple but relatively time-consuming operation may be implemented in hardware, and may be implemented in software in a component having many logics and many changes. For example, the header separation unit 210, the transmission data storage unit 230, the encryption unit 280, and the transmission block generation unit 290 may be implemented by hardware logic, and the upper layer processing unit 250 and the second layer may be implemented. The function processor 260, the two-layer control information processor 270, and the location storage unit 240 may be implemented as a software program. As described above, the header compression unit 220 may be implemented by hardware logic or a software program.

Hereinafter, a processing operation of the transmission data converter 120 will be described with reference to FIG. 3.

Referring to FIG. 3, in step 310, the header separator 210 separates a received three-layer PDU generated by an upper layer into a header and three-layer data. Separation of the header may be performed in hardware using a constant size of the header.

In operation 320, the header compression unit 220 compresses the header separated by the header separation unit 210 in a predetermined compression scheme, and the header separation unit 210 transmits the separated three-layer data to the transmission data storage unit 230. Store in The header compression of the header compression unit 220 and the three-layer data storage of the header separation unit 210 may be performed at the same time, but may be performed sequentially or independently depending on the relationship.

In operation 330, the two-layer function processor 260 disassembles and / or assembles the three-layer data stored in the transmission data storage 230 to match the transmission size. Information regarding the space (including the position, the size, etc.) of the disassembled and / or assembled three-layer data is stored in the position storage unit 240, and the two-layer function processing unit 260 is stored in the position storage unit 240. Access to recognize the information or may receive the information from the upper layer processing unit 250.

In operation 340, the two-layer control information processor 270 generates a two-layer header. The operation of the two-layer control information processing unit 270 may be controlled by the two-layer function processing unit 260. The layer 2 header includes headers for information on disassembly / assembly of layer 3 PDUs and control information for resource allocation.

In operation 350, the two-layer function processor 260 determines whether a transmission interrupt is generated from the data transmitter 130. The transmission interrupt performs a function of notifying the transmission data converter 120 that the data transmission unit 130 may transmit the transport block.

If no transmission interrupt is generated, the process proceeds to step 310 and the above-described processing (steps 310 to 340) is repeatedly performed for the three-layer PDUs received from the higher layer.

However, if a transmission interrupt occurs, the flow proceeds to step 360, where the layer 2 control information processing unit 270 includes information on the storage location of the input data to be encrypted, the compressed header provided from the header compression unit 220, and the data to be used for encryption. The key value, the sequence number, and the like are transmitted to the encryption unit 280. The input data includes one or more three-layer data stored in the transmission data storage 230.

In operation 370, the encryption unit 280 may include one or more input data stored at the location of the transmission data storage unit 230 corresponding to the received information about the storage location (including the storage address of the input data and the size of the input data). And encrypting the input data using one or more compressed headers corresponding thereto, and one or more of a key value and a sequence number.

In operation 380, the transport block generator 290 generates a transport block by adding a two-layer header (that is, a packed header) generated by the two-layer control information processor 270 to the data encrypted by the encryption unit 280. The transport block generator 290 stores the transport block at a specific address location of the transmission memory 200 corresponding to the output location provided by the layer 2 control information processor 270.

Thereafter, the data transmitter 130 transmits the transport block stored in the transmission memory 200 to the receiving terminal 135 through the network.

4 is a diagram illustrating a configuration of a receiving data converter according to an embodiment of the present invention, and FIG. 5 is a flowchart illustrating a data conversion process of a receiving data converter according to an embodiment of the present invention.

Referring to FIG. 4, the received data converter 150 may include a header combiner 490, a header restorer 480, a received data store 470, a location store 460, a higher layer processor 450, The second layer function processor 440, the second layer control information separator 430, the decoder 420, and the transport block disassembly unit 410 may be configured. Some of the illustrated components may be omitted, or a plurality of components may be integrated into one component, and one or more of each component may be implemented in the form of a software program. As described below, the function of each component of the receive data converter 150 performs a function that is the same as or opposite to that of the component of the transmit data converter 120 described above. Therefore, it is obvious that the reception data converter 150 and the transmission data converter 120 may be integrated into one data converter and included in the transmission terminal 100 or the reception terminal 135.

The data receiver 140 stores the transport block transmitted from the data transmitter 130 of the transmitting terminal 100 through the network in the reception memory 400. The data receiver 140 notifies the reception data converter 150 that the transport block has been received and stored in the reception memory 400, and provides information on a location where the transport block is stored.

The transport block tearing unit 410 separates the bundle header from the transport block read from the reception memory 400 based on the information about the provided position. As described above, the bundle header includes a retransmission header for retransmission for each transmission data PDU, and the retransmission header includes information about one or more three-layer PDUs included in the transmission unit packet (eg, location, size, shape, etc.). One or more).

The decryption unit 420 decrypts the encrypted transmission unit packet from which the bundle header is separated by the transport block disassembly unit 410 by using a predetermined value or a key value received from the transmission terminal 100. Among the decoded data, the layer 3 data is stored in the received data storage 470, and the compressed header is provided to the header decompression unit 480.

The reception data storage unit 470 stores three-layer data, and also stores the compressed header and may be provided to the header decompression unit 480. The reception data storage unit 470 may be a physical memory such as a DRAM or an SRAM.

The second layer control information separating unit 430 is notified of the data reception from the data receiving unit 140 and refers to the control information in the receiving memory 400 by referring to the retransmission header in the bundle header separated by the transport block disassembly unit 410. Separate data. Here, the data reception notification may include information (address information) regarding a location stored in the reception memory 400 in which the received transport block is stored.

Also, in order to allow the encrypted transmission unit packet to be decrypted by the decryption unit 420, the second layer control information separation unit 430 reads and decrypts address information in which the encrypted transmission unit packet is stored in the location storage unit 460. Provided to section 420. In this case, information about a position in the reception data storage unit 470 in which the data decoded by the decoder 420 is to be stored may also be provided.

The second layer function processing unit 440 may decode the data as the data included in the transmission unit packet received after the third layer data is not configured by the decrypted data as the data included in one encrypted transmission unit packet. By using a single three-layer data can be assembled. This is caused because the transmitting terminal 100 may disassemble / assemble three-layer data to configure a transmission unit packet, and in the receiving terminal 135, fragments may be included in the bundle header in configuring three-layer data. It can be recognized using a header regarding information about decomposition / assembly of data.

The upper layer processor 450 supports functions supported by higher layers of three or more layers, that is, mobility management, transmission control, session management, and the like, and performs various parameter management for controlling two layers or less. For example, the upper layer processor 450 performs a control management function for various decryption algorithms, key value maintenance, and various functions supported by the second layer.

The location storage unit 460 includes one or more of information on a storage location of a transmission unit packet stored in the reception memory 400, that is, address information and size information.

The header decompressor 480 restores the header compressed by the header compression unit 220 of the transmission data converter 120 and provides the header decompressor 490 to the header combiner 490. For example, the ROHC scheme may be used for header compression and decompression.

The header combiner 490 combines the header restored by the header decompressor 480 and the three-layer data stored in the received data storage 470 to generate a complete three-layer PDU.

In the present embodiment, a component for processing a simple but relatively time-consuming operation may be implemented in hardware, and may be implemented in software in a component having many logics and many changes. For example, the header combiner 490, the received data store 470, the decoder 420, and the transport block disassembler 410 may be implemented by hardware logic, and the upper layer processor 450 and the second layer may be implemented. The function processor 440, the two-layer control information separator 430, and the location storage unit 460 may be implemented as a software program. The header restoration unit 480 may be implemented by hardware logic or software program.

Hereinafter, an operation process of the reception data converter 150 will be described with reference to FIG. 5. The reception data converter 150 may perform an operation in a direction opposite to the operation sequence of the transmission data converter 120 described above.

In operation 510, the transmission block transmitted from the transmitting terminal 100 through the network is stored in the receiving memory 400. When the transport block is received and stored, the data receiver 140 notifies the second layer control information separator 430 of the reception of the transport block. In this case, the data receiver 140 may notify the information regarding the location of the reception memory 400 in which the transport block is stored.

In step 520, the transport block tearing unit 410 separates the bundle header (layer 2 header) from the transport block.

In operation 530, the two-layer control information separator 430 stores the storage location information of the transmission unit packet read by the location storage unit 460 and the storage location information of the reception data storage unit 470 in which the decoded three-layer data is to be stored. The decoder 420 notifies. The separated bundle header may be provided to the layer 2 control information separator 430.

In operation 540, the decryption unit 420 decrypts the transmission unit packet stored in the reception memory 400 using a predetermined key value or the like received from the transmission terminal 100. The decoded compressed header is provided to the header decompressor 480 to be decompressed, and the decoded layer 3 data is stored in the received data storage 470.

In operation 550, the two-layer function processor 440 determines whether the data stored in the received data storage 470 is complete three-layer data. This is to check whether the three-layer PDU to be delivered to the upper layer can be provided in a complete form according to the transmission order. A bundle header provided to the two-layer control information separator 430 may be used. For example, if the remaining fragment portion is not received as fragmented layer 3 data yet, the sequence number does not match, or may not be restored due to a compressed header error or the like, it may be determined that the layer 3 data is not complete layer 3 data. . The fragmented layer 3 data may be received because the transmission terminal 100 may decompose one layer 3 data to include only a part of the transmission unit packet.

If it is determined that the data is not complete three-layer data, the process proceeds to step 560 where the second-layer function processing unit 440 determines whether the required piece is already stored in the reception data storage unit 470 and can be assembled.

If assembly is possible, go to step 570 to construct one layer 3 data using the pieces. Although it is illustrated in the drawing to proceed to step 580 after performing step 570, the process may proceed to step 550 again after performing step 570.

However, if the fragment portion has not yet been stored in the received data storage 470, the process proceeds back to step 510 since the processing for the subsequent transport block must be preceded.

If the determination result of step 550 determines that the data is complete three-layer, the process proceeds to step 580, where the header combiner 490 stores the header restored by the header restoration unit 480 and the three layers stored in the received data storage unit 470. Combine the data to create a three-layer PDU.

In step 590, the upper layer is notified that the three-layer PDU has arrived. Here, the notification may be performed by one or more of the higher layer processor 450, the two-layer function processor 440, and the like.

The above description has been mainly focused on the case where the three-layer PDU is encrypted and output, and the inputted transmission unit packet is decrypted to restore the three-layer PDU. However, whether the transmission data conversion unit 120 according to the present invention encrypts the three-layer PDU or the two-layer PDU added to the header already divided and assembled, the same goes from the second layer to the first layer. It can be easily understood with reference to the embodiments described herein that the feature of performing encryption and outputting only the portion requiring encryption in the previous step. Similarly, it will be easily understood that the reception data converter 150 may perform a function corresponding thereto.

The above-described communication method in the communication system, that is, the data conversion method in the transmission data conversion unit and the data conversion method in the reception data conversion unit, may be performed in an automated procedure in a time series order by a software program built in the terminal device. It may be obvious. Codes and code segments constituting the program can be easily inferred by a computer programmer in the art. In addition, the program is stored in a computer readable media, and read and executed by a computer to implement the method. The information storage medium includes a magnetic recording medium, an optical recording medium and a carrier wave medium.

Although the above has been described with reference to embodiments of the present invention, those skilled in the art may variously modify the present invention without departing from the spirit and scope of the present invention as set forth in the claims below. And can be changed.

1 is a schematic diagram of a communication system according to one embodiment of the invention;

2 is a diagram illustrating a configuration of a transmission data converter according to an embodiment of the present invention.

3 is a flowchart illustrating a data conversion process of a transmission data conversion unit according to an embodiment of the present invention.

4 is a diagram illustrating a configuration of a reception data converter according to an embodiment of the present invention.

5 is a flowchart illustrating a data conversion process of a reception data conversion unit according to an embodiment of the present invention.

Claims (21)

delete In the method for the terminal device to convert the data to be transmitted over the network, (a) receiving a higher layer header separated from one or more three-layer PDUs; (b) compressing the higher layer header; (c) receiving location information about a location of a transmission data storage unit storing three-layer data from which the upper-layer header is separated from the three-layer PDU; (d) controlling to perform encryption by providing at least one location information storing the three-layer data and a corresponding compressed one or more upper layer headers; And (e) generating a transport block by adding a layer 2 header to the transmission unit packet generated by performing the encryption, Layer 2 is a data link layer, In the step (a), the upper layer header occupies a predetermined size in the three-layer PDU, and is separated by hardware logic. In the method for the terminal device to convert the data to be transmitted over the network, (a) receiving a higher layer header separated from one or more three-layer PDUs; (b) compressing the higher layer header; (c) receiving location information about a location of a transmission data storage unit storing three-layer data from which the upper-layer header is separated from the three-layer PDU; (d) controlling to perform encryption by providing at least one location information storing the three-layer data and a corresponding compressed one or more upper layer headers; And (e) generating a transport block by adding a layer 2 header to the transmission unit packet generated by performing the encryption, Layer 2 is a data link layer, The step (b) is the transmission data conversion method characterized in that the compression of the upper layer header by the Robust Header Compression (ROHC) method. In the method for the terminal device to convert the data to be transmitted over the network, (a) receiving a higher layer header separated from one or more three-layer PDUs; (b) compressing the higher layer header; (c) receiving location information about a location of a transmission data storage unit storing three-layer data from which the upper-layer header is separated from the three-layer PDU; (d) controlling to perform encryption by providing at least one location information storing the three-layer data and a corresponding compressed one or more upper layer headers; And (e) generating a transport block by adding a layer 2 header to the transmission unit packet generated by performing the encryption, Layer 2 is a data link layer, And disassembling or assembling at least one layer 3 data so that the transmission unit packet corresponding to the predetermined size of the transport block is generated before step (d). In the method for the terminal device to convert the data to be transmitted over the network, (a) receiving a higher layer header separated from one or more three-layer PDUs; (b) compressing the higher layer header; (c) receiving location information about a location of a transmission data storage unit storing three-layer data from which the upper-layer header is separated from the three-layer PDU; (d) controlling to perform encryption by providing at least one location information storing the three-layer data and a corresponding compressed one or more upper layer headers; And (e) generating a transport block by adding a layer 2 header to the transmission unit packet generated by performing the encryption, Layer 2 is a data link layer, And the output transport block is stored in a transmission memory in the data transmission unit. In the method for the terminal device to convert the data to be transmitted over the network, (a) receiving a higher layer header separated from one or more three-layer PDUs; (b) compressing the higher layer header; (c) receiving location information about a location of a transmission data storage unit storing three-layer data from which the upper-layer header is separated from the three-layer PDU; (d) controlling to perform encryption by providing at least one location information storing the three-layer data and a corresponding compressed one or more upper layer headers; And (e) generating a transport block by adding a layer 2 header to the transmission unit packet generated by performing the encryption, Layer 2 is a data link layer, And the step (d) is performed when a transmission interrupt from the data transmission unit is detected. In the method for the terminal device to convert the data to be transmitted over the network, (a) receiving a higher layer header separated from one or more three-layer PDUs; (b) compressing the higher layer header; (c) receiving location information about a location of a transmission data storage unit storing three-layer data from which the upper-layer header is separated from the three-layer PDU; (d) controlling to perform encryption by providing at least one location information storing the three-layer data and a corresponding compressed one or more upper layer headers; And (e) generating a transport block by adding a layer 2 header to the transmission unit packet generated by performing the encryption, Layer 2 is a data link layer, Wherein said step (b) and said step (c) are performed simultaneously. In the method for the terminal device to convert the data to be transmitted over the network, (a) receiving a higher layer header separated from one or more three-layer PDUs; (b) compressing the higher layer header; (c) receiving location information about a location of a transmission data storage unit storing three-layer data from which the upper-layer header is separated from the three-layer PDU; (d) controlling to perform encryption by providing at least one location information storing the three-layer data and a corresponding compressed one or more upper layer headers; And (e) generating a transport block by adding a layer 2 header to the transmission unit packet generated by performing the encryption, Layer 2 is a data link layer, The layer 2 header includes one or more of a header for duplication check, a header for retransmission, a header for information on disassembly or assembly of a layer 3 PDU, and a header for information required for media access control. How to convert data. A recording medium on which a program of instructions that can be executed by a digital processing apparatus is implemented to perform the transmission data conversion method according to any one of claims 2 to 8, and records a program that can be read by the digital processing apparatus. delete An apparatus for converting data to be transmitted over a network, A header separator that separates one or more three-layer PDUs into upper layer headers and three layer data; A header compression unit to compress the separated upper layer header; A transmission data storage unit for storing the separated three-layer data; A two-layer function processor for managing location information regarding the location of the transmission data storage unit in which the three-layer data is stored; A transmission unit packet by encrypting at least one layer 3 data read from the transmission data storage unit according to at least one upper layer header compressed by the header compression unit and corresponding position information received from the layer 2 function processing unit An encryption unit for generating a; A layer 2 control information processor for generating a layer 2 header to be added to the transmission unit packet; And A transport block generator configured to generate and output a transport block to which the layer 2 header is added to the transport unit packet; Layer 2 is a data link layer, And the header separator is implemented by hardware logic to separate the upper layer header using a predetermined size in the three-layer PDU. An apparatus for converting data to be transmitted over a network, A header separator that separates one or more three-layer PDUs into upper layer headers and three layer data; A header compression unit to compress the separated upper layer header; A transmission data storage unit for storing the separated three-layer data; A two-layer function processor for managing location information regarding the location of the transmission data storage unit in which the three-layer data is stored; A transmission unit packet by encrypting at least one layer 3 data read from the transmission data storage unit according to at least one upper layer header compressed by the header compression unit and corresponding position information received from the layer 2 function processing unit An encryption unit for generating a; A layer 2 control information processor for generating a layer 2 header to be added to the transmission unit packet; And A transport block generator configured to generate and output a transport block to which the layer 2 header is added to the transport unit packet; Layer 2 is a data link layer, And the header compression unit compresses the upper layer header by a Robust Header Compression (ROHC) method. An apparatus for converting data to be transmitted over a network, A header separator that separates one or more three-layer PDUs into upper layer headers and three layer data; A header compression unit to compress the separated upper layer header; A transmission data storage unit for storing the separated three-layer data; A two-layer function processor for managing location information regarding the location of the transmission data storage unit in which the three-layer data is stored; A transmission unit packet by encrypting at least one layer 3 data read from the transmission data storage unit according to at least one upper layer header compressed by the header compression unit and corresponding position information received from the layer 2 function processing unit An encryption unit for generating a; A layer 2 control information processor for generating a layer 2 header to be added to the transmission unit packet; And A transport block generator configured to generate and output a transport block to which the layer 2 header is added to the transport unit packet; Layer 2 is a data link layer, And the second layer function processing unit decomposes or assembles one or more layer 3 data to generate the transmission unit packet corresponding to the size of the transport block. An apparatus for converting data to be transmitted over a network, A header separator that separates one or more three-layer PDUs into upper layer headers and three layer data; A header compression unit to compress the separated upper layer header; A transmission data storage unit for storing the separated three-layer data; A two-layer function processor for managing location information regarding the location of the transmission data storage unit in which the three-layer data is stored; A transmission unit packet by encrypting at least one layer 3 data read from the transmission data storage unit according to at least one upper layer header compressed by the header compression unit and corresponding position information received from the layer 2 function processing unit An encryption unit for generating a; A layer 2 control information processor for generating a layer 2 header to be added to the transmission unit packet; And A transport block generator configured to generate and output a transport block to which the layer 2 header is added to the transport unit packet; Layer 2 is a data link layer, And the output transmission block is stored in a transmission memory in the data transmission unit. An apparatus for converting data to be transmitted over a network, A header separator that separates one or more three-layer PDUs into upper layer headers and three layer data; A header compression unit to compress the separated upper layer header; A transmission data storage unit for storing the separated three-layer data; A two-layer function processor for managing location information regarding the location of the transmission data storage unit in which the three-layer data is stored; A transmission unit packet by encrypting at least one layer 3 data read from the transmission data storage unit according to at least one upper layer header compressed by the header compression unit and corresponding position information received from the layer 2 function processing unit An encryption unit for generating a; A layer 2 control information processor for generating a layer 2 header to be added to the transmission unit packet; And A transport block generator configured to generate and output a transport block to which the layer 2 header is added to the transport unit packet; Layer 2 is a data link layer, And the encryption unit performs encryption when a transmission interrupt from the data transmission unit is detected. An apparatus for converting data to be transmitted over a network, A header separator that separates one or more three-layer PDUs into upper layer headers and three layer data; A header compression unit to compress the separated upper layer header; A transmission data storage unit for storing the separated three-layer data; A two-layer function processor for managing location information regarding the location of the transmission data storage unit in which the three-layer data is stored; A transmission unit packet by encrypting at least one layer 3 data read from the transmission data storage unit according to at least one upper layer header compressed by the header compression unit and corresponding position information received from the layer 2 function processing unit An encryption unit for generating a; A layer 2 control information processor for generating a layer 2 header to be added to the transmission unit packet; And A transport block generator configured to generate and output a transport block to which the layer 2 header is added to the transport unit packet; Layer 2 is a data link layer, The layer 2 header includes one or more of a header for duplication check, a header for retransmission, a header for information on disassembly or assembly of a layer 3 PDU, and a header for information required for media access control. Data conversion device. delete In the method for converting the data received by the terminal device via the network, (a) a transmission unit packet in which a layer 2 header is separated from a transport block received through a network, is decoded to receive position information about a location stored in a received data memory as at least one compressed upper layer header and at least one layer 3 data; step; (b) restoring the higher layer header; (c) providing location information in which the restored upper layer header and corresponding layer 3 data are stored to generate a layer 3 protocol data unit (PDU) in which the restored upper layer header and the layer 3 data are combined; step; And (d) informing the control layer of the reception report for the three-layer PDU, Layer 2 is a data link layer, Step (c) is, Determining whether all pieces of fragments capable of restoring the layer 3 PDU are received from the layer 3 data decoded in the step (a); If all have not been received, re-performing step (a) for transport blocks subsequently received over the network; And And generating the normally assembled three-layer data using two or more pieces of fragmented three-layer data based on the two-layer header. 19. A recording medium on which a program of instructions that can be executed by a digital processing apparatus is implemented to perform the method of converting a received data according to claim 18, wherein the program can be read by the digital processing apparatus. delete In the device for converting data received via a network, A transport block breaker for separating a transport block received through a network into a layer 2 header and a transport unit packet; A decoder configured to decode the transmission unit packet into one or more compressed upper layer headers and one or more three-layer data; A reception data storage unit for storing the decoded three-layer data; A header decompressor for restoring the decoded upper layer header; A header combiner for generating a three-layer protocol data unit (PDU) by combining the upper layer header restored by the header decompressor and the three-layer data; And Including a higher layer processing unit for notifying the control layer of the reception report for the three-layer PDU, Layer 2 is a data link layer, Further comprising a two-layer function processing unit for generating one normally assembled three-layer data using two or more fragmented three-layer data, If the at least one fragmented layer 3 data exists, the layer 2 function processor further generates the normally assembled layer 3 data by further using other fragmented layer 3 data decoded using a transport block received afterwards through a network. Receiving data conversion device.

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