A Method for Enhancing Real-time Data Transmission under Fibre Channel

Abstract

The present invention discloses a method for enhancing real-time data transmission under a fiber channel. An enhanced real-time frame structure is introduced into the fiber channel, and data is transmitted with the highest priority according to the connection information in the enhanced real-time frame structure. Specifically, it includes the following processes. Step 1, establish clock synchronization in the FC system of the fiber channel; Step 2, set the transmission period and data size of the enhanced real-time frames in the FC system; Step 3, the FC system sets a synchronization period, uses the synchronization period as the frame header, and the information sender should calculate the frame header start point and regularly send data; Step 4, the switching network forwards N-port data in the first-class service mode and transmits data with the highest priority; Step 5, the receiver receives the data transmitted with the highest priority. By embedding the synchronous transmission technology into the asynchronous data transmission, more detailed priority and level distinctions are implemented for services, better meeting and matching the real-time transmission requirements to meet the high real-time performance in aircraft, vehicle, ship, and spaceborne electronic communication systems.

Description

Technical Field

[0001] The present invention belongs to the field of information transmission, and more specifically, to a method for enhancing real-time data transmission under a fiber channel. Background Art

[0002] With the application and development of network architecture construction technology, communication technology, computing technology, etc. in electronic communication systems, current on-board, vehicle-mounted, shipborne, and spaceborne electronic communication systems are further developing towards the direction of unification, flexibility, and easy integration, and the requirements for data transmission in bus networks are also getting higher and higher.

[0003] However, in the prior art, the data transmission in bus networks fails to meet the requirements, and there is an urgent need for a communication technology designed to meet the requirements of high-performance data transmission, with large bandwidth, low latency, long-distance transmission, flexible topology (adapting to the topology architectures of various fixed networks), and supporting multiple upper-layer protocols. Summary of the Invention

[0004] In order to solve the problems existing in the prior art, the present invention provides a method for enhancing real-time data transmission under a fiber channel to meet the reliable, effective, and real-time data transmission requirements in the application field.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] A method for enhancing real-time data transmission under a fiber channel includes the following processes.

[0007] Introduce an enhanced real-time frame structure into the fiber channel, and transmit data with the highest priority according to the connection information in the enhanced real-time frame structure.

[0008] Preferably, it specifically includes the following processes.

[0009] Step 1, establish clock synchronization in the FC system of the fiber channel.

[0010] Step 2, set the transmission period and data size of the enhanced real-time frames in the FC system.

[0011] Step 3, the FC system sets a synchronization period. Taking the synchronization period as the frame header, the information sender should calculate the frame header start point and regularly send data.

[0012] Step 4, the switching network forwards N-port data in the first-class service mode and transmits data with the highest priority.

[0013] Step 5, the receiver receives the data transmitted with the highest priority.

[0014] Preferably, the enhanced real-time frame structure is a SOF field, and an enhanced service connection delimiter SOFe1 is added to the SOF frame to indicate that this frame type is an enhanced real-time frame.

[0015] Preferably, the SOFe1 delimiter function is for enhancing service connection, the initial value of RD is negative, and the ordered set is defined as K28.5, D21.5, D23.0, D23.0.

[0016] Preferably, the protocol layering model of the fiber channel includes: FC-0 physical link layer, FC-1 transport layer, FC-2 frame protocol layer, FC-3 common service layer, and FC-4 protocol mapping layer;

[0017] Preferably, the fiber channel uses 8B10B encoding in the FC-1 transport layer.

[0018] Preferably, the FC-2 frame protocol layer uses a hierarchical structure when establishing blocks, from the bottom layer to the top layer in sequence: frame / sequence / switching service.

[0019] Compared with the prior art, the present invention has the following beneficial technical effects:

[0020] The present invention provides a method for enhancing real-time data transmission under a fiber channel. By utilizing the existing FC protocol, real-time sub-channels with periodic intervals are extended for the transmission of real-time data with the highest priority, ensuring the preferential transmission of data carrying relevant information during the periodic time occupancy period. By embedding synchronous transmission technology into asynchronous data transmission, more detailed priority and level differentiation are implemented for services, better meeting and matching real-time transmission requirements. A technology for higher real-time data transmission can be constructed on the basis of the current fiber channel technology and effectively integrated with the current fiber channel technology to meet the high real-time requirements in aircraft, vehicle, ship, and spaceborne electronic communication systems.

[0021] Furthermore, the 8B10B encoding adopted by the fiber channel in the FC-1 layer ensures current balance, meets long-distance serial transmission, special characters, and facilitates clock recovery. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the protocol layering model of the fiber channel;

[0023] Figure 2 It is a schematic diagram of the hierarchical relationship of protocol data units;

[0024] Figure 3 It is a structural diagram of the FC-2 layer;

[0025] Figure 4 It is a schematic diagram of the fiber channel frame structure;

[0026] Figure 5 It is a schematic diagram of the fiber channel frame structure;

[0027] Figure 6 It is a schematic diagram of the operation process of the enhanced service technology; Detailed implementation manners

[0028] The present invention will be further described in detail below in conjunction with specific embodiments, which are explanations rather than limitations of the present invention.

[0029] The Fiber Channel (FC) has these advantages and is a communication technology designed to meet the requirements of high-performance data transmission and is accompanied by supporting protocols.

[0030] As Figure 1 shown, the protocol adopted by the Fiber Channel technology uses a hierarchical model, which is divided into five layers: FC-0 (physical link layer), FC-1 (transmission layer), FC-2 (frame protocol layer), FC-3 (common service layer), FC-4 (protocol mapping layer). As Figures 3 - 6 shown, layers FC-0, FC-1, and FC-2 constitute the FC physical layer, which defines the physical characteristics of FC. FC-3 and FC-4 respectively define network services and other protocol interfaces.

[0031] The Fiber Channel provides four service types applied to the FC switching network and N ports. These service classes are mainly distinguished according to the method of allocating and maintaining communication loops between communicating N ports and the level of delivery integrity required by the application.

[0032] The first type of service is a service that provides a dedicated connection. A type 1 connection is when one N port requests a connection to another N port, and the other N port will send an ACK to the N port that requests to establish the connection. Once the connection is established, the switching network should maintain and guarantee this connection until one of the N ports requests to revoke the connection.

[0033] The second type of service is that the operating environment provides a connectionless service with undelivered notification between two N ports. This type of service allows an N port to send multiple frames to multiple destination N ports without establishing a dedicated connection with any of them. At the same time, this type of service also allows an N port to receive multiple frames from one or more N ports without establishing a dedicated connection.

[0034] The third type of service is that the operating environment provides a connectionless service without delivery or undelivered notification, or end-to-end flow control between two N ports, and a datagram service.

[0035] There is also a type of service called a hybrid service. The hybrid service is an option of the type 1 service, which allows two N ports that have established a dedicated connection of the type 1 service to insert type 2 service and type 3 service frames.

[0036] In view of the scenario with hybrid services, the present invention adds a special enhanced real-time transmission method to ensure the use of applications with particularly high real-time requirements.

[0037] The method proposed by the present invention and related technologies analyze the Fiber Channel protocol at the real-time data transmission level in various application scenarios of airborne, vehicle-mounted, shipborne, and spaceborne electronic communication systems. An enhanced real-time data transmission technology is proposed, which further improves the real-time and reliable transmission of data and meets the real-time data transmission requirements in various airborne, vehicle-mounted, shipborne, and spaceborne electronic communication systems.

[0038] The present invention introduces a synchronous real-time technology into the Fiber Channel. Using the existing FC protocol, real-time sub-channels with periodic intervals are extended for the transmission of real-time data with the highest priority, ensuring the priority transmission of data carrying relevant information during the periodic time occupancy period. The function is extended on the basis of the existing Fiber Channel to meet the requirements of strongly real-time applications.

[0039] The Fiber Channel protocol defines three protocol data units: Frame, Sequence, and Exchange. In the hierarchical structure of FC data transmission, the most basic unit transmitted at the FC-2 layer is the frame, and the length of a valid frame should be an integer multiple of the transmission word. The structural relationship between the frame, sequence, and exchange is shown in Figure 2.

[0040] At the same time, the FC-2 layer protocol uses a hierarchical structure when establishing a block, from the bottom layer to the top layer in turn: frame / sequence / exchange service. The organizational structure of the block is as Figure 3 shown.

[0041] The frame is the basic data unit for information interaction between two nodes in the Fiber Channel network. The FC frame structure is as Figure 4 shown:

[0042] The Fiber Channel uses 8B10B coding at the FC-1 layer to ensure current balance, meet long-distance serial transmission, special characters, and facilitate clock recovery.

[0043] The present invention adds a new definition for the SOF field to meet the requirements of strong real-time performance.

[0044] Under the technology of overall clock synchronization of the Fiber Channel, an enhanced real-time frame structure is introduced. The SOF frame delimiter adds an enhanced service connection SOF in the following Figure 5 to indicate that this frame type is an enhanced real-time frame. e1

[0045] SOF e1 ​The delimiter function is for enhancing service connection. The initial value of RD is negative. The ordered set is defined as K28.5, D21.5, D23.0, D23.0. A connection is established between the sending and receiving N ports according to the enhanced service frame. Under the real-time requirements of the given enhanced service data (synchronization period, data size), the enhanced service data should be set as the transmission data with the highest priority by utilizing the fiber channel system clock synchronization condition, with SOF e1 With the head information, the enhanced service frame is preferentially transmitted.

[0046] Such as Figure 6 As shown, a method for enhancing real-time data transmission under a fiber channel in the present invention includes the following steps,

[0047] Step 1, establish clock synchronization in the FC system;

[0048] Step 2, set the transmission period and data size of the enhanced service frame in the FC system;

[0049] Step 3, the system sets the synchronization period. Taking the synchronization period as the frame header, the information sender should calculate the starting point of the frame header and regularly send data;

[0050] Step 4, the switching network forwards the N port data in the first-class service mode;

[0051] Step 5, the receiver receives the data.

[0052] Under the SOFe1 frame delimiter, an additional definition is added to the ordered set. When the other party receives this definition, connection information such as the established period and data length is determined according to the subsequent content agreement, and then data transmission is carried out according to the first-class service. The key point lies in this additional definition, indicating that data is transmitted with the highest priority according to the agreed period and data length

[0053] All nodes (sender, switching network, receiver) in the fiber channel system need to follow the enhanced service frame protocol to ensure that this type of frame is processed according to the technical requirements of the enhanced service frame at the correct clock node, thereby ensuring the realization of real-time performance.

[0054] Based on the method of the present invention, a technology for constructing higher real-time data transmission can be built on the basis of the current fiber channel technology and effectively integrated with the current fiber channel technology to meet the high real-time requirements in aircraft, vehicle, ship, and spaceborne electronic communication systems.

[0055] The foregoing has shown and described the basic principles, main features and advantages of the present invention. For a person skilled in the art, it is obvious that the present invention is not limited to the details of the above-mentioned exemplary embodiments, and without departing from the spirit or basic features of the present invention, the present invention can be implemented in other specific forms. Therefore, in any aspect, the embodiments should be regarded as exemplary and non-restrictive. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be embraced by the present invention. Any reference signs in the claims should not be construed as limiting the claims concerned.

[0056] In addition, it should be understood that although this specification is described according to embodiments, not every embodiment only contains an independent technical solution. This narrative way of the specification is only for clarity. A person skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by a person skilled in the art. The above content is only to illustrate the technical idea of the present invention and cannot be used to limit the protection scope of the present invention. Any modification made on the basis of the technical solution according to the technical idea proposed by the present invention falls within the protection scope of the claims of the present invention.

Claims

1. An enhanced real-time data transmission method under a fiber channel, characterized in that, It includes the following processes: Introduce an enhanced real-time frame structure in the fiber channel, and transmit data with the highest priority according to the connection information in the enhanced real-time frame structure; The enhanced real-time frame structure is the SOF field, and an enhanced service connection SOFe1 delimiter is added to the SOF frame to indicate that this frame type is an enhanced real-time frame; The function of the SOFe1 delimiter is an enhanced service connection, the initial value of RD is negative, and the ordered set is defined as K28.5, D21.5, D23.0, D23.

0.

2. The enhanced real-time data transmission method under a fiber channel according to claim 1, wherein, Specifically, it includes the following processes: Step 1, establish clock synchronization in the FC system of the fiber channel; Step 2, set the transmission period and data size of the enhanced real-time frame in the FC system; Step 3, the FC system sets the synchronization period. Taking the synchronization period as the frame header, the information sender should calculate the frame header start point and send data regularly; Step 4, the switching network forwards N-port data in the first-class service mode and transmits data with the highest priority; Step 5, the receiver receives the data transmitted with the highest priority.

3. A method for enhancing real-time data transmission under a fiber channel according to claim 1, characterized in that, The protocol layering model of the fiber channel includes: FC-0 physical link layer, FC-1 transport layer, FC-2 frame protocol layer, FC-3 common service layer, and FC-4 protocol mapping layer.

4. A method for enhancing real-time data transmission under a fiber channel according to claim 3, characterized in that, The fiber channel uses 8B10B encoding in the FC-1 transport layer.

5. A method for enhancing real-time data transmission under a fiber channel according to claim 3, characterized in that, The FC-2 frame protocol layer uses a hierarchical structure when establishing a block, from bottom to top in turn: frame / sequence / switching service.

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