TW540207B - Transmission member handling priority packets supported by single chip buffer structure and virtual area network label - Google Patents

Abstract

The present invention provides a transmission member handling priority packets supported by single chip buffer structure and virtual area network label, wherein the network data packets can be separated as high priority packets and low priority packets. In the member, the high priority packets is transmitted in priority than the low priority packets to be compliant with the actual priority requirement, and by continuously transmitting the packets to maintain the high transmission efficiency. Furthermore, the transmission member according to the present invention is compatible with different kinds of chip structures, so it needs not to replace the hardware when applying to different chip structures.

Description

540207 A7

Printed by the Consumer Property Cooperative of the Intellectual Property Bureau of the Ministry of Economics Field of the Invention: The present invention relates to a network packet processed on a general computer system. Personal computer with transmission software components that process network data packets. BACKGROUND OF THE INVENTION: A stand-alone computer, such as a personal computer, in a general working environment is a laptop computer that can increase portability, and its performance can be rapidly improved by the king of the Internet. This computer network allows δ power & and another on the network. Teleportation is for its resources. For example, printers, modems, and other shareable resources in the storage area. ^ Data shared between computers ’is transmitted through a physical network. ^ Packets are transmitted and read by the receiving computer. This: The form of network data may be a resource for sharing, data such as: files, or other information, which must be connected from one computer to another computer. 1 used here, 'Internet Data, 'is the data or information that is actually transmitted between different computers through the connection. 'σ' A specific computer or node on this network, when sending network data to other computers, use a network interface card (NIC) or a network card to monitor ^ ----- 1-- ------- 1 l · I--Order · -------- (Please read the notes on the back before filling in this page)

540207 A7 V. Description of the invention () The connection channel of the packet. Through the operation of the operating system, the software components running on the node computer can manage and control the daze of the network interface card. In addition, other software components further virtualize the network connection channels and provide more network interfaces for higher layers. Because the concept of ‘Layer’ is proposed to further help the development of web applications. Among them, the iso seven-layer communication protocol is best known. In fact, the implementation of the IS0 module does not require hard isolation of each layer, so that the separated components expose their interface to the upper and lower layers. The concept of this module can usually be applied. The lower layer of the IS0 module is the data link layer, as well as the transport and network layers. Among them, the data link layer is implemented by a network link card, and the transport and network layers are used as the transport protocol driving layer. Low-level network functions, such as controlling network cards and network packet processing, are controlled by specific system software components, called drivers, which are integrated with the operating system of the host according to a specific architecture and have access System resource permissions. It can be referred to the Windows NT® or Windows 98® operating system provided by Microsoft Corporation. Printed by the Consumer Cooperatives of the Intellectual Property Bureau of the Ministry of Economic Affairs For various reasons', various transmission agreements have been developed over time. Different transport protocol drivers are implemented on a single host system as software components that provide the necessary network functions. Some common transport protocols include TCP / IP, IPX, AppleTalk®, and others. Each transmission protocol driver is connected to an individual network card component driver. This paper size applies the Chinese National Standard (CNS) A4 specification (210 X 297 mm) 540207

V. Description of the Invention () Printed by the Consumer Cooperatives of the Intellectual Property Bureau of the Ministry of Economic Affairs, the network is used to transmit network data, and to receive network packets from the pastoral team to connect to the network. In addition, because various manufacturers provide a variety of marriage cards, grape cards, relatively different network drivers for different network card application chip structure, such as DC21140, DC21142, DC21143 Can't find the network card due to the details. In order to provide more complete link support for the transport protocol driver, the network driver must be capable of supporting various forms of transport protocol programs. In addition, the information between the transport protocol driver and the network card component driver must be linked so that the network data can be processed appropriately before sending data to the network or after receiving data from the network. The general method for transmitting or receiving data prepares two serial channels. For example, high-priority packets are transmitted over high-priority sequence channels. Similarly, low-priority packets are transmitted over low-priority sequence channels. Therefore, at least two hardware FIFO sequence channels need to be provided for linking network data. Therefore, an effective and highly compatible transmission component is needed to process packet network data. OBJECTS AND SUMMARY OF THE INVENTION Therefore, the present invention provides a transmission component for processing priority packets and virtual area network tags supported by a single-chip buffer structure. The transmission component of the present invention has priority to transmit high-priority packets over low-priority packets in order to comply with actual requirements.

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Itr i I This paper size applies the Chinese National Standard (CNS) A4 specification (210 x 297 mm) 540207 A7 V. Description of the invention (international priority requirements. And, it continuously transmits packets to maintain high transmission efficiency. Moreover, this paper The transmission member of the invention can be compatible with various different chip structures, so the transmission member of the invention can be applied to different chip structures without hardware replacement. The transmission structure has one less network piece, and the protocol layer is sent from the network. The data packet checker from the transmission line is listed to allow the packets to pass; the one with the network data priority value is received from the interface card component. Network interface structure, starting from the active network (please read the notes on the back before filling this page) The present invention provides a priority between the transport protocol layer and the network interface to handle the support of the single-chip buffer structure The envelope includes a transmission unit, which transmits from the transmission protocol layer to the data packet to the network interface card component layer, and a receiving unit interface card component layer transmission At least one network data packet arrives. The transmitting component includes: a priority checker that receives at least one network data packet at the protocol layer, and checks one of the network priority values. A high priority sequence allows high priority. Priority network data packets pass; a low-priority self-priority checker with a low-priority network data packet priority controller 'controls the transmission rate of packets passing south-priority and low-priority packets; a tag is inserted Structure, inserting a label in a data packet with a high way; and an active transmission sequence from the label insertion structure of the network data packet and transmitting it to the network layer. The receiving part includes an active receiving sequence that receives the incoming card component layer. A network data packet; and a tag removal node receiving sequence to receive the network data packet and remove one of the tags with a high-quality data packet. 'The paper size applies the Chinese National Standard (CNS) A4 specification (210 X 297 mm) 540207

V. Description of the Invention The present invention also refers to a method for transmitting network data packets from a round robin protocol layer to a Kushiro "face card component layer", including the following steps: · receiving a packet from the transport protocol layer. Check the priority value of the packet, and assign the packet to a high-priority sequence or a low-priority sequence according to the good prior value of the packet. Then insert a tag in the packet with the same priority value. The rate of N: 1 is transmitted to the network interface card component layer. The present invention also provides a method for receiving network data packets from the network interface card component layer to the transport protocol layer, including the following steps: from the network interface card component layer Receive a packet. Then remove a token from a packet with a high priority. Then send the packet to the transport protocol layer and specify the priority of the packet to the transport protocol layer. The diagram simply illustrates: The preferred embodiment of the present invention will In the following explanatory texts, the following figures are supplemented to make a more detailed explanation, of which: The network system of the noodles road printed by the Consumer Cooperatives of the Intellectual Property Bureau of the Ministry of Economy The obvious connection between the consecutive example and the actual application of the face and the actual application is to send a clear copy of the order. The loser and the card are as shown in Figure 11. The encapsulation of the example shows that the actual example is better than the original one. The figure is shown in Figure 2. The SN (C quasi-standard home country and middle school uses a moderate rule of paper t public 97 2 X 10 (2 standard 540207 A7 B7. V. Printed invention description printed by the Consumer Cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs.) Block diagram of the structure. Figure 3 shows the flow chart of how to process the data packets from the transport protocol layer and send them to the network interface card. Figure 4 shows one of the output packets when the priority value does not need to be inserted. Block diagram. ^ Figure 5 is a block diagram illustrating the packet transfer wheel and inserting a VLAN tag in the output packet when the priority value needs to be inserted. / Figure 6 shows how the high priority sequence is not included in the ISR. Low-priority sequence packet flow chart. Figure 7 is a flowchart showing how to receive data packets from the network interface card and send them to the transport protocol layer. Figure 8 is about VLAN tag removal techniques. No. comparison description: 100 transport agreement layer 200 transmission component 210 transmission component 212 priority checker 214 high priority sequence 216 low priority sequence 218 priority controller 220 tag insertion structure 222 active transmission sequence 230 receiving part 232 active reception sequence 234 Label removal structure 300 Network interface card Detailed description of the invention: This paper size applies to China National Standard (CNS) A4 (210 X 297 mm) 540207

The consumer cooperation of the Intellectual Property Bureau of the Ministry of Economic Affairs prints a photo of the customer, “The best implementation of the network interface card (NIC) and misinformation + Α ^”, A block diagram of the interfaces and connections between the protocol layers. The transmission unit 200 of the present invention is located between the transmission protocol drawer and the network interface card component driver 300 to transmit the network ^ and connect a separate computer to other materials on the material. This transmission unit ^ Consists of several software components. The right rear view m Μ 丄 ice The software component in the transmission component 200 can be simply divided into two parts, which are used to send and receive network packets, respectively. The software components in the transmission unit 21 (3) include a high-quality inspection H 212, a high-quality health sequence 2 ", a low-priority sequence 216 called the antecedent controller 21, a two-tag insertion structure 220, and an active transmission sequence. 222. The software components in the receiving part 230 include an active receiving sequence 232 and a label removing structure 2 3 4. The priority checker 2 in the transmitting part 2 10 must ask the cooperation layer 100 for a packet. ) And determine which packets must be sent to the high-priority sequence 2 1 4 and which packets must be sent to the low-priority sequence 2 1 6. The priority controller 2 18 must decide when and how many packets And its priority from the high and low priority sequences 2 1 4 and 2 16 is sent to the active transmission sequence 222. However, in actual implementation, the protocol layer 10 (will send packets to the driver from time to time. Therefore Priority control must be divided into two procedures: the transmission packet procedure and the interrupt service step (ISr). In these two perspectives, the number of packets staying in the active transmission sequence 222 is appropriately handled to avoid congestion. Based on the consideration of transmission efficiency, Priority controller 2 1 8 must continuously process packets. This paper size shows T-household standard (CNS) A4 specifications (21Q x 297 mm ^) ----------- «Shang ---- ---- Order- 丨 (Please read the note on the back? Matters before filling out this page) 540207 A7 B7 V. Description of the invention () Please refer to Figure 2, which shows the direct memory access (Dma) descriptor (descriptor) A block diagram of the data structure of the packet. First define the descriptor of each packet. In order to insert a virtual area network (VLAN) tag into each packet, define the DMA descriptor to have a skip length 32 bytes. In the last 16 bytes of skipped length, the content of the first 4 bytes is the VLAN tag, and the second 4 bytes is the actual address of the VLAN tag. The VLAN tag address will be specified during the initialization phase of the network interface card (NIC). The present invention will explain the method of transmitting network packets from the transport protocol layer to the network interface card (NIC) in the following description. Please refer to FIG. 3 , Which shows a flowchart of how to send data packets from the transport protocol layer to the network interface card. A network driver interface specification (NDIS) technology is used to integrate network interface card driver and carousel protocol layer. It runs on Windows NT or Window 98 operating system and is called NDIS package component driver. The interaction between the services and hardware of each layer in the N DIS technology management system. Please refer to Figure 1 and Figure 3. In the transmission packet program, the transmission component 210 of the transmission component 200 receives the packet from the NDIS, and processes and distributes it. Into the proper sequence. First, the driver in the transmitting unit 2 receives a packet from the N DIS. Does this driver depend on whether the resources are based on the paper size and apply the Chinese National Standard (CNS) A4 specification (210 X 297 mm) (Please read the precautions on the back before filling this page) n ϋ— nnn an n Order- ------ Printed by the Consumer Cooperatives of the Intellectual Property Bureau of the Ministry of Economic Affairs 540207 Printed by the Consumer Cooperatives of the Intellectual Property Bureau of the Ministry of Economic Affairs A7 B7 V. Description of the invention () Enough to distribute packets to the appropriate sequence. If the resources are sufficient, the driver will receive the priority value of each incoming packet through the function provided by NDIS (NDIS_PER — PACKET —INFO —FROM —PACKET). If the priority value of the packet is high, for example, from about 4 to 7 ', the driver will assign the packet to the high-priority sequence 2 丨 4. Similarly, the driver will assign the low-priority packet to the low-priority sequence 2 1 6, low The priority packet has a priority value of about 0 to 3, for example. Then, see if there is a packet. If so, the driver receives a packet from NDIS again. If not, then proceed to the next step. Then check to see if the NIC has just finished initializing or the DMA descriptor is empty. If it is ’, the packets in the high and low priority sequences 2 丨 4, 2 丨 6 will be sent to the active transmission sequence. Before sending the packet to the DMA descriptor, insert a VLAN tag in the high-priority packet. In order to insert a VLAN tag into each packet, as previously defined, each descriptor has a skip length of 32 bytes. In the range of the last 6 bytes of the skipped length, the first 4-byte is the VLAN tag, and the second 4-byte is the actual address of the VLAN tag. If the packet has no priority value, the driver will directly put the packet into the active transmission sequence. If the packet has a priority value, the driver divides the first buffer into two parts. The first part has a length i 2 bytes. The first descriptor refers to the first part of the first buffer and the VLAN tag area. The second DMA descriptor will point to the remainder of the first buffer so that a VLAN tag can be inserted into the packet. Packets with a priority value in the first buffer will then be transmitted via the network line. When the NIC is initialized or all the packets in the descriptor are sent, the driver must apply part of the paper size to the Chinese National Standard (CNS) A4 specification (210 X 297 mm) ----------- -Install ----- r --- Order -------- h (Please read the notes on the back before filling out this page) Printed by the Consumer Cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs 540207 A7 B7 V. Invention Explanation () The packet is put into the DMA descriptor. Among them, high-priority packets and low-priority packets will be sent out at a rate of N: 1, such as 5: 1. However, if high priority packets and low priority packets cannot maintain the N: 1 transmission ratio, the driver will keep sending M packets, but will modify the sending rate. In this case, the transmission ratio of the high-priority packet to the low-priority packet may be M: 0, M-1: 1? M-2: 2, M-3: 3, ..., Hi, or 0: Μ〇. In the following description, the present invention will describe the steps for processing packets with or without a priority value, and the technique of inserting a VLAN tag with a specified priority value in the sent packet. Please refer to Figure 4. If the packet does not have a priority value, the second tag descriptor (TDES 2) in the first descriptor must point to the first buffer, and the third tag descriptor (D) in the first descriptor DES3) must point to the second buffer. Therefore, the 'driver is like other drivers in a normal network environment. See Figure 5 'If the packet has a priority value, the driver divides the first buffer into two parts. A first portion of the first buffer has a length of 12 bytes' and a second portion has the remainder of the first buffer. The first descriptor of the first descriptor (DDES2) points to the first part of the first buffer, and the third tag descriptor of the first descriptor (DES3) changes to the VLAN tag area, and then The second tag descriptor (TDES2) of the second descriptor becomes a pointer to the second buffer. The other buffers of this packet will be based on its 11 paper sizes, which are applicable to the Chinese National Standard (CNS) A4 specification (210 X 297 mm) ------------ · pack ----- r (please Read the precautions on the back before filling this page) II Order 540207 A7 B7 Printed by the Consumer Cooperatives of the Intellectual Property Bureau of the Ministry of Economic Affairs 5. Description of the invention (his description is to designate when the package uses the method of the present invention At this time, it is important to achieve the quality of service (QoS) goal. Therefore, the interrupt service step (ISR) procedure is used. The following will describe the ISR in the high priority and the low priority sequence Packet processing method. Previously, we have sequenced many packets. When the driver processes the sorted packets, the high-priority packets are processed first. Also, for the sending of high-priority packets and low-priority packets, please refer to In Figure 6, the driver first processes the sorted packets. Then it checks whether the high-priority sequence and the low-priority sequence are empty. If the high-priority sequence and the low-priority sequence are both empty, # 着 看 Resources are sufficient .If resources are sufficient , And then see if the sending rate of high-priority packets and low-priority packets is N: 1. If the sending rate is N: Bu insert a VLAN tag in a high-priority packet, and use N high-priority packets with 丨 low The proportion of priority packets is sent. Then the process returns to the consideration of whether the high-priority sequence and the low-priority sequence are empty. Then continue the process. If the sending rate is not N: 1, the driver will still send M packets. For example, there are 6 packets. In this case, the transmission ratio of the high-priority packet to the low-priority packet may be M: 0, Ml: l, M-2: 2, M-3: 3, ... ., 1: M-1 or 0: M. This method can keep the NIC busy and enhance its performance. Then in the following description, 'The present invention will describe receiving the network cover from the NIC. The paper size applies the Chinese national standard ( CNS) A4 specification (210 X 297 mm) ---------- II --- I l · --- ^ --------- (Please read the precautions on the back first (Fill in this page) 540207 A7 printed by the Consumers ’Cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs (5) Method of packing to the transport agreement layer. Please refer to 7 _, which shows how to receive data packets from NK: Gang, and the processing is transmitted to the transport protocol layer 100. Please refer to Figure i and Figure 7 at the same time. The receiving part 230 of the transmission component 200 will process Receive the packet from NIC 300 and check its priority. Baixian, the driver in the receiving section 230 receives the packet from NIC 300. This driver will consider whether the resource is sufficient. If the resource is sufficient, the driver will By verifying the presence of a vlan tag in the first 16 bytes of the packet, the priority value of the packet is checked. VLAN #zang actually exists: in the range of 12th to 15th byte of each packet. If there is a VLAN tag in this packet, the driver will shift the first 12 bytes (including the destination address and the source address) to the right by 4 bytes and cover the address in the signed area. Finally, the function provided by NDIS (NDIS_PER_PACKET_INFO_FROM_PACKET) is used again to specify or report the priority value of N DIS entering the packet. In the following description, the present invention will describe a technique for removing a VLAN tag with a specified priority. Please refer to Figure 8. When the driver recognizes that a VLAN tag exists in the original first buffer, the driver will shift the first 12 bytes to the right and cover the VLAN tag area. The displacement value is 4 bits. Tuple. The driver then allocates the second tag descriptor (TDES2) to the subsequent first buffer (the first buffer that has been changed). Therefore, an uploaded packet is completed. The driver of the present invention uses the NDIS-PER-PACKE-Ding-INFO-PACKET function (13 paper sizes of NDIS apply Chinese National Standard (CNS) A4 specification (210 X 297 mm) ------- ----- ^ · III l · I 1 I ^ ---------. (Please read the note on the back? Matters before filling out this page) 540207 V. Description of the invention () (1) Record in the structure of the superior packet. After driving the wife to notify NDIS about the superior value processing of the uploaded packet ... w, Ka Lai, we can use this technique to remove the VLAN tag. In summary, the present invention provides a transmission component for processing priority packets and virtual area network tags supported by a single-chip buffer structure. The transmission component of the present invention transmits high-priority packets over low-priority packets to meet actual priority requirements. In addition, packets are continuously transmitted to maintain high rounding efficiency. Moreover, the transmission member of the present invention is compatible with various different wafer structures, so the transmission member of the present invention can be applied to different wafer structures without the need to change hardware. As understood by those familiar with this technology, the above description is only the preferred embodiment of the present invention, and is not intended to limit the scope of the patent application of the present invention; all others are completed without departing from the spirit disclosed by the present invention Equivalent drum changes or modifications should be included in the scope of patent applications described below. Printed by the Consumer Cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs

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Claims (1)

540207 VI. Scope of patent application Scope of patent application: 1 * A kind of processing is carried out by a single chip buffering + +, 5, ^ Q, Q, Q priority support package, a transmission component of the virtual network tag-a virtual The zone is applicable between the transport protocol layer and the network interface software layer. The transfer wheel components include: Pavement card: transmission section # 'Transfer from the transport protocol layer to the packet to the network interface card component layer, which includes: ㈣ Bayer priority! · Health checker, receives a packet of the network data from the transport protocol, * ^ • ^ and checks one of the network data packet's priority values, the first sequence is allowed, from the priority check The network data packet with a high priority value in the router passes; a σ eight low priority sequence 'allows the network data packet from the priority checker and a low priority value to pass; a β-eight priority controller , To control the proportion of the network data packets that pass the high priority value to the low priority value; only to insert a tag into the network data packet with the high priority value without iron insertion structure; and (please read the back first (Notes on the next page) Outfitting.: ^! ^ This order printed by the Intellectual Property Bureau of the Ministry of Economic Affairs, the employee consumer cooperative printed a single piece of the network layer and stuck it into the face plug; Components: The self-card element includes a tap card package to receive the interface, and the receiving interface, the network layer, and the network sequence are listed to the co-sequence. The transmission is from transmission to transmission, input and transmission. This move the main contract department to the main one to receive the package | Material is to be sealed and the material is to be used. The paper size is applicable to the Chinese National Standard (CNS) A4 specification (210 × 297 mm) 5 07 02 4 six A8 B8 C8 The network data packet; and the signature removal structure '^ The active receiving sequence receives the network data packet and removes the signature with a high priority. One of the network data packets is labeled as the transmission component of the "Shenyue Patent Confinement" member, where the high priority is 4 1 7 0 with a value of about 3. If you request the transmission component of the scope of the patent, Among them, 0 to 3. The low priority value is printed by the Consumer Cooperatives of the Intellectual Property Bureau of the Ministry of Economic Affairs. The transmission component of the item, wherein the rate of transmitting the network data packet in the priority controller with the priority value and the low priority value is N: 1. 5. For the transmission component of the scope of application for item 4, the value of n can be any integer. 6. For example, the transmission component of the first scope of the patent application, wherein when the network data packets with high value and low priority are not enough, by sending a fixed packet, it has high priority in the priority controller. Value and low priority value The transmission ratio of the network data packet can be modified to M: 〇, n M-3: 3, ..., 1: M-1 or 0: M. 16 This paper size applies to China National Standard (CNS) A4 (21 × 297 mm) 540207 A8 B8 C8 : If the scope of the patent application is "the transmission wheel component of the item, where M can be any integer (please read the precautions on the back before ^^ this page) 8 · —A kind of network packet transmission from the transport protocol layer to the network " The method of the card element layer includes the following steps: receiving a packet from the transport protocol layer; receiving a priority value of the packet, and assigning the packet to a high priority sequence or a low priority sequence according to the priority value of the packet; A label is inserted into the packet having a priority value; and the packet having two priority values and a low priority value is sent to the network interface card component layer with N: 1 & you. Ordered by the Consumer Property Cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs.9. If the method of applying for the scope of patent No. 8 is used, when the driver transmits a packet with a priority value of South, the first buffer of the packet with high priority value will be divided into two. Part, and by reallocating the actual address of each buffer to the dma descriptor, the DMA description & can be sequentially pointed to: the first part of the first buffer, the VLAN tag, the second of the first buffer High priority packets for some and other buffers, thus avoiding a lengthy memory copy. 10. The method according to item 9 of the patent application scope, wherein the VLAN tag and its position do not limit the position of the DMA descriptor, and the VLAN tag and its position can be announced at any position. 17 This paper size applies the Chinese National Standard (CNS) A4 specification (210X297 mm) 540207 A8 B8 C8 ____ D8 VI. Application scope of patent 1 1 · If the method of item 8 of the scope of patent application, the high priority value is about 4 to 12. If the method of applying for the scope of the patent, the low priority value is about 0 to about 0 printed by the Consumer Cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs. 13. If the method of applying for the scope of the patent, the high priority value and the low priority value. The transmission ratio of network data packets can be any value that can achieve good performance. 14. The method according to item 8 of the scope of patent application, wherein when the network data packets with high priority and low priority are not enough to be transmitted with the ratio N: 1, M packets will be fixedly transmitted. Therefore, in the priority controller, The transmission ratio of the network data packets with high priority and low priority can be modified as M: 0, M · 1: 1, M-2: 2, M-3: 3, ... 1: M-1 or 〇 · Μ. 15. A method as claimed in claim μ, wherein M is any integer value capable of obtaining good performance. 1 6. —A method for receiving network data packets from the network interface card component layer to the transport protocol layer, including the following steps: receiving a packet from a network interface card component layer; 18 This paper standard applies the Chinese National Standard (CNS ) Α4 size (210X297 mm) (please read the precautions on the back first, then this page) —Packing, 1-5 line 540207 A8 B8 C8 D8 6. Patent application scope Remove a label from a packet with high priority; and Send the packet to the transport protocol layer, and specify the priority value of the packet to the transport protocol layer. 17. If the method of claim 16 is applied, when a driver recognizes that there is a VLAN tag in the first buffer of a packet transmitted by a network line, the driver will send the first 12 bits The group is shifted to the right by 4 bytes and covers the position of the VLAN tag area. (Please read the precautions on the back first, and then this page)-Installed · Printed on tT line Printed by the Consumer Cooperatives of the Intellectual Property Bureau of the Ministry of Economic Affairs This paper size applies to China National Standard (CNS) A4 (210X297 mm)