Business transmission method, electronic device, and computer readable storage medium

Abstract

The present application provides a business transmission method, an electronic device, and a computer readable storage medium. The business transmission method comprises: receiving a first business packet sent by a client side device; and mapping, on the basis of a business service identifier in the first business packet, the first business packet to an optical transport network container corresponding to the first business packet, and transmitting the optical transport network container to which the first business packet is mapped.

Description

Business transmission method, electronic device, and computer-readable storage medium

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to Chinese patent application No. 202311827402.4 filed on December 27, 2023, the contents of which are incorporated herein by reference in their entirety. Technical Field

[0003] The present application relates to, but is not limited to, the field of communication technology, and in particular to a service transmission method, an electronic device, and a computer-readable storage medium. Background Art

[0004] In the definition of the Optical Transport Network (OTN), customer services are carried through client-side signals on a port-based basis, such as the Synchronous Transport Module level n (STM-N) signal of the Synchronous Digital Hierarchy (SDH), as well as Fast Ethernet (FE) signals, Gigabit Ethernet (GE) signals, 10GE signals, 100GE signals, 400GE signals, and various other signals. Subsequent product evolution supports the Packet Enhanced Optical Transport Network (POTN), supports the use of pseudowire (PW) encapsulation of signals, and carries services through label switched path (LSP) tunnel labels, and transmits customer services through client-side ports and sub-ports. However, with the evolution of cloud-network integration and computing power networks, the service transmission methods in related technologies are no longer applicable. Summary of the Invention

[0005] In the first aspect, the present application provides a service transmission method, which is applied to an edge optical transmission network device, including: receiving a first service message sent by a customer-side device; mapping the first service message to an optical transmission network container corresponding to the first service message according to a service service identifier in the first service message, and transmitting the optical transmission network container mapped with the first service message.

[0006] In the second aspect, the present application provides a service transmission method, which is applied to edge optical transmission network equipment, including: receiving an optical transmission network container sent by a network side device, demapping a service message from the optical transmission network container; and forwarding the service message to a target customer side device according to a service service identifier in the service message.

[0007] In a third aspect, the present application provides an electronic device comprising: at least one processor; a memory, wherein at least one computer program is stored in the memory, and when the at least one computer program is executed by the at least one processor, the at least one processor implements the above-mentioned service transmission method.

[0008] In a fourth aspect, the present application provides a computer-readable storage medium having a computer program stored thereon. When the computer program is executed by a processor, the processor implements the above-mentioned service transmission method. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] FIG1 is a flow chart of a service transmission method provided by the present application;

[0010] FIG2 is a schematic diagram of a service transmission path provided by this application;

[0011] FIG3 is a flow chart of the service transmission method provided by the present application;

[0012] FIG4 is a block diagram of the electronic device provided in this application. DETAILED DESCRIPTION

[0013] In order to enable those skilled in the art to better understand the technical solution of the present application, the service transmission method, electronic device, and computer-readable storage medium provided by the present application are described in detail below with reference to the accompanying drawings.

[0014] Hereinafter, example embodiments will be described more fully with reference to the accompanying drawings, but the example embodiments may be embodied in different forms, and the present application should not be construed as limited to the embodiments set forth herein. These embodiments are provided to make this application more thorough and complete and to enable those skilled in the art to fully understand the scope of this application.

[0015] In the absence of conflict, the various embodiments of the present application and the various features therein may be combined with each other.

[0016] As used herein, the term "and / or" includes any and all combinations of at least one of the associated listed items.

[0017] The terms used herein are used only to describe specific embodiments and do not limit this application. As used herein, the singular forms "a," "an," and "the" also include the plural forms, unless the context clearly indicates otherwise. It will also be understood that when the terms "comprising" and / or "made of" are used in this specification, they specify the presence of a particular feature, whole, step, operation, element, and / or component, but do not exclude the presence or addition of at least one other feature, whole, step, operation, element, component, and / or group thereof.

[0018] Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by those skilled in the art. It will also be understood that terms such as those defined in commonly used dictionaries should be interpreted as having a meaning consistent with their meaning in the context of the relevant art and this application, and will not be interpreted as having an idealized or overly formal meaning unless expressly defined as such herein.

[0019] FIG1 is a flow chart of the service transmission method provided in this application.

[0020] In a first aspect, referring to FIG1 , the present application provides a service transmission method, which is applied to an edge OTN device. More precisely, the edge OTN device here should be a source edge OTN device in a service transmission path corresponding to a service message.

[0021] The service transmission method includes: steps 100 and 101.

[0022] Step 100: Receive a first service message sent by a client-side device.

[0023] In some implementations, the client-side device may be a Custom Edge (CE) device.

[0024] In some implementations, as shown in Table 1, the first service message sent by the client-side device includes: an Ethernet header (ETH Header), a service identifier (SID, Service IDentifier), and a payload (Payload).

[0025] In some implementations, the service SID includes: a destination SID (dstSID) and a source SID (srcSID).

[0026] In some implementations, the ETH Header includes: a source address and a destination address.

[0027] In some implementations, the source address may be a Media Access Control (MAC) address of an interface of a device that sends the first service message, and the destination address may be a MAC address of an interface of a device that receives the first service message.

[0028] Table 1

[0029] In some embodiments, the client-side device can obtain the MAC address of the user network interface (UNI) of the edge OTN device based on the Address Resolution Protocol (ARP), use the MAC address of the UNI of the edge OTN device as the destination address in the Ethernet header of the first service message, use the MAC address of the interface of the client-side device as the source address in the Ethernet header of the first service message, write the source SID and destination SID corresponding to the first service message, and the payload into the first service message, and send the first service message to the edge OTN device.

[0030] Step 101: Map the first service message to an OTN container corresponding to the first service message according to a service identifier in the first service message, and transmit the OTN container mapped with the first service message.

[0031] In some implementations, mapping the first service message to an OTN container corresponding to the first service message based on a service service identifier in the first service message, and transmitting the OTN container to which the first service message is mapped (i.e., step 101) includes: searching a first service routing table based on a destination SID, and when routing information corresponding to the destination SID is found in the first service routing table, obtaining an OTN path label corresponding to the service SID; determining the routing information based on a service level agreement (SLA) requirement corresponding to the first service message; mapping the first service message to an OTN container corresponding to the OTN path label; and transmitting the OTN container to which the first service message is mapped according to the routing information.

[0032] In some implementations, the routing information refers to routing information of the service transmission path corresponding to the first service message in the local node.

[0033] In some implementations, the service transmission path corresponding to the first service message may be determined according to the SLA requirement corresponding to the first service message, and the routing information may be determined according to the service transmission path corresponding to the first service message.

[0034] In some implementations, the routing information may also be determined directly according to the SLA requirement corresponding to the first service message.

[0035] In some implementations, after receiving a first service message sent by a client-side device, the source MAC address and the destination MAC address in the Ethernet header of the first service message are verified for validity. After the validity verification passes, the first service message is mapped to an OTN container corresponding to the first service message based on the service identifier in the first service message, and the OTN container mapped with the first service message is transmitted (i.e., step 101).

[0036] In some implementations, as shown in Table 2, the first service routing table includes: a destination SID and routing information.

[0037] Table 2

[0038] In some implementations, the SLA requirement includes at least one of the following: bandwidth requirement, delay requirement, jitter requirement, packet loss rate requirement, etc.

[0039] In some implementations, a service transmission path of the first service message may be determined according to an SLA requirement corresponding to the first service message, and the first service routing table may be constructed or updated based on the determined service transmission path.

[0040] In some implementations, when constructing the first service routing table, it is necessary to determine routing information according to the service transmission path, and construct the first service routing table based on the routing information.

[0041] In some implementations, when updating the first service routing table, it is necessary to determine updated routing information according to the service transmission path, and update the first service routing table based on the updated routing information.

[0042] In some implementations, the routing information of the first service message may be directly determined according to the SLA requirement corresponding to the first service message, and the first service routing table may be constructed or updated based on the determined routing information.

[0043] In some implementations, if routing information corresponding to the destination SID cannot be found in the first service routing table, the service message may be discarded.

[0044] In some implementations, obtaining the OTN channel label corresponding to the service SID in the first service message includes: searching a service mapping table according to the service SID; and when the OTN channel label corresponding to the service SID is found in the service mapping table, obtaining the found OTN channel label.

[0045] In some implementations, as shown in Table 3, the service mapping table includes: a service SID and an OTN channel label (OTN Channel Label).

[0046] In some implementations, the service SID includes: a source SID and a destination SID.

[0047] Table 3

[0048] In some implementations, obtaining the OTN channel label corresponding to the service SID in the first service message includes: searching a service mapping table according to the service SID; if the OTN channel label corresponding to the service SID cannot be found in the service mapping table, sending a channel label acquisition request to a software defined network service controller (SDNC); and receiving the OTN channel label sent by the SDNC.

[0049] In some implementations, the channel label acquisition request includes a destination SID.

[0050] In some implementations, the purpose of sending a channel label acquisition request to the SDNC is to trigger the SDNC to search the second service routing table according to the destination SID to obtain service routing information, determine the source edge OTN device and the destination edge OTN device corresponding to the service message according to the service routing information, create a service transmission path from the source edge OTN device to the destination edge OTN device according to the service SID, and send configuration information of the service transmission path to the source edge OTN device, the intermediate OTN device, and the destination OTN device; generate an OTN channel label according to the service transmission path, and send the OTN channel label to the source edge OTN device.

[0051] In some implementations, the service routing information includes node information of a service transmission path from a client-side device to a target client-side device.

[0052] In some implementations, the service transmission path is determined according to the SLA requirements corresponding to the service message.

[0053] In some implementations, the OTN channel label includes cross-connect configuration information of nodes on a service transmission path corresponding to the service message; the service transmission path is determined according to the SLA requirements corresponding to the service message.

[0054] In some implementations, the OTN channel label may be an end-to-end L1 layer channel based on the customer's SLA requirements.

[0055] In some embodiments, the cross-configuration information may be any one of optical service unit (OSU) cross-configuration information, optical channel data unit k (ODUk) cross-configuration information, fine-grained flexible optical channel data unit (fgODUflex) cross-configuration information, and the like.

[0056] In some implementations, a service transmission path may include a working path and a protection path. As shown in Figure 2, the transmission path from CE device -> edge OTN device 1 -> OTN device 1 -> edge OTN device 2 -> CE device or PE device or xGW is a working path, while the transmission path from CE device -> edge OTN device 1 -> OTN device 2 -> edge OTN device 3 -> CE device or PE device or xGW is a protection path.

[0057] In some implementations, the service transmission path may also include only the working path.

[0058] In some implementations, the protection path may be implemented using any one of an end-to-end Subnetwork Connection Protection (SNCP) method, a segmented SNCP method, and a Dual Node Interconnection (DNI) (SNCP DNI) protection method.

[0059] In some implementations, the OTN container may include a primary OTN container and a backup OTN container.

[0060] In some implementations, the OTN container may also include only a primary OTN container.

[0061] In some implementations, the primary OTN container corresponds to a working path, and the backup OTN container corresponds to a protection path.

[0062] In some implementations, the ONT container may be, for example, any one of OSUflex, fgODUflex, ODUk, and the like.

[0063] In some implementations, before mapping the first service message to the OTN container corresponding to the OTN channel label, the service transmission method further includes: removing the Ethernet header in the first service message to obtain a second service message.

[0064] In some implementations, mapping the first service packet into the OTN container corresponding to the OTN path label includes: mapping the second service packet into the OTN container corresponding to the OTN path label.

[0065] Transmitting the OTN container mapped with the first service message according to the routing information includes: transmitting the OTN container mapped with the second service message according to the routing information.

[0066] The service transmission method provided in the present application realizes differentiated carrying and identification of the service based on the service service identifier corresponding to the first service message, and performs differentiated transmission based on the identified service to meet the transmission requirements of the service.

[0067] In some implementations, a first service routing table is constructed based on the SLA requirements corresponding to the first service message, and service transmission is performed based on the first service routing table, thereby achieving differentiated transmission according to the service to meet the transmission requirements of the service.

[0068] In some implementations, a service mapping table is constructed based on the SLA requirements corresponding to the first service message, and service carrying and identification are performed based on the service mapping table, thereby achieving differentiated carrying and identification of services to meet service transmission requirements.

[0069] FIG3 is a flow chart of the service transmission method provided in this application.

[0070] In the second aspect, referring to FIG3 , the present application provides a service transmission method, which is applied to an edge OTN device. More precisely, the edge OTN device here should be the destination edge OTN device in the service transmission path corresponding to the service message.

[0071] The service transmission method includes: steps 300 and 301.

[0072] Step 300: Receive an OTN container sent by a network-side device, and demap a service message from the OTN container.

[0073] In some implementations, the network-side device includes any OTN device between the source edge OTN device and the destination edge OTN device.

[0074] In some implementations, after receiving the OTN container, the network-side device forwards the OTN container, or performs SNCP selective forwarding, or SNCP dual-channel forwarding.

[0075] In some implementations, the OTN container may include a primary OTN container and a backup OTN container.

[0076] In some implementations, the OTN container may also include only a primary OTN container.

[0077] In some implementations, the primary OTN container corresponds to a working path, and the backup OTN container corresponds to a protection path.

[0078] In some implementations, the ONT container may be, for example, any one of OSUflex, fgODUflex, ODUk, and the like.

[0079] In some implementations, the service message obtained by demapping may be the aforementioned first service message or the second service message.

[0080] Step 301: forward the service message to the target client-side device according to the service SID in the service message.

[0081] In some implementations, the service SID includes a source SID and a destination SID.

[0082] In some embodiments, forwarding the service message to the target client-side device according to the service SID in the service message (i.e., step 301) includes: searching the first service routing table according to the destination SID, and forwarding the service message to the target client-side device according to the routing information corresponding to the destination SID found in the first service routing table; the routing information is determined according to the SLA requirements corresponding to the service message.

[0083] In some implementations, the target customer-side device may be any one of a CE device, a Provider Edge (PE) device, an xGateway (xGW), and the like.

[0084] In some implementations, as shown in Table 2, the first service routing table includes: a destination SID and routing information.

[0085] In some implementations, the SLA requirement includes at least one of the following: bandwidth requirement, delay requirement, jitter requirement, packet loss rate requirement, etc.

[0086] In some implementations, routing information refers to routing information of a service transmission path corresponding to a service message in the local node.

[0087] In some implementations, a service transmission path corresponding to the service message may be determined according to an SLA requirement corresponding to the service message, and routing information may be determined according to the service transmission path corresponding to the service message.

[0088] In some implementations, routing information may also be determined directly based on the SLA requirements corresponding to the service message.

[0089] In some implementations, a service transmission path for the service message may be determined according to an SLA requirement corresponding to the service message, and the first service routing table may be constructed or updated based on the determined service transmission path.

[0090] In some implementations, when constructing the first service routing table, it is necessary to determine routing information according to the service transmission path, and construct the first service routing table based on the routing information.

[0091] In some implementations, when updating the first service routing table, it is necessary to determine updated routing information according to the service transmission path, and update the first service routing table based on the updated routing information.

[0092] In some implementations, routing information of the service message may also be directly determined according to the SLA requirements corresponding to the service message, and the first service routing table may be constructed or updated based on the determined routing information.

[0093] In some implementations, if routing information corresponding to the destination SID cannot be found in the first service routing table, the service message may be discarded.

[0094] In some embodiments, after demapping the service message from the OTN container (i.e., step 300), before forwarding the service message to the target client-side device according to the service SID in the service message (i.e., step 301), the service transmission method further includes: obtaining the address of the target client-side device when the service message does not include an Ethernet header; and adding an Ethernet header to the service message according to the address of the edge OTN device and the address of the target client-side device.

[0095] In some implementations, when the service message is the aforementioned second service message, the service message does not include an Ethernet header.

[0096] In some implementations, the address of the target client-side device may be acquired based on the ARP of the edge OTN device and the target client-side device.

[0097] In some implementations, the address of the target client device may be a MAC address of an interface of the target client device.

[0098] In some embodiments, adding an Ethernet header to a service message based on the address of an edge OTN device and the address of a target client-side device includes: using the address of the edge OTN device as the source address in the Ethernet header added to the service message, and using the address of the target client-side device as the destination address in the Ethernet header added to the service message.

[0099] In some embodiments, after demapping the service message from the OTN container (i.e., step 300), before forwarding the service message to the target client-side device according to the service SID in the service message (i.e., step 301), the service transmission method further includes: when the service message includes an Ethernet header, obtaining the address of the target client-side device; and updating the Ethernet header in the service message according to the address of the edge OTN device and the address of the target client-side device.

[0100] In some implementations, when the service message is the first service message implemented above, the service message includes an Ethernet header.

[0101] In some embodiments, updating the Ethernet header in the service message according to the address of the edge OTN device and the address of the target client-side device includes: replacing the source address in the Ethernet header in the service message with the address of the edge OTN device, and replacing the destination address in the Ethernet header in the service message with the address of the target client-side device.

[0102] The service transmission method provided in the present application realizes differentiated carrying and identification of the service based on the service service identifier corresponding to the first service message, and performs differentiated transmission based on the identified service to meet the transmission requirements of the service.

[0103] In some implementations, a first service routing table is constructed based on the SLA requirements corresponding to the first service message, and service transmission is performed based on the first service routing table, thereby achieving differentiated transmission according to the service to meet the transmission requirements of the service.

[0104] In some implementations, a service mapping table is constructed based on the SLA requirements corresponding to the first service message, and service carrying and identification are performed based on the service mapping table, thereby achieving differentiated carrying and identification of services to meet service transmission requirements.

[0105] In the third aspect, referring to Figure 4, the present application provides an electronic device, including: at least one processor 401; a memory 402, on which at least one computer program is stored. When the at least one computer program is executed by the at least one processor 401, the at least one processor 401 implements the above-mentioned business transmission method.

[0106] In some embodiments, the electronic device further includes: at least one I / O interface 403 connected between the processor 401 and the memory 402 , and configured to implement information interaction between the processor 401 and the memory 402 .

[0107] The processor 401 is a device with data processing capabilities, including but not limited to a central processing unit (CPU); the memory 402 is a device with data storage capabilities, including but not limited to random access memory (RAM, more specifically such as SDRAM, DDR, etc.), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), and flash memory (FLASH); the I / O interface (read-write interface) 403 is connected between the processor 401 and the memory 402, and can realize information interaction between the processor 401 and the memory 402, including but not limited to a data bus (Bus), etc.

[0108] In some implementations, the processor 401 , the memory 402 , and the I / O interface 403 are connected to each other via a bus 404 , and further connected to other components of the computing device.

[0109] In a fourth aspect, the present application provides a computer-readable storage medium having a computer program stored thereon. When the computer program is executed by a processor, the processor implements the above-mentioned service transmission method.

[0110] It will be appreciated by those skilled in the art that all or some of the steps in the method disclosed above, and the functional modules / units in the device can be implemented as software, firmware, hardware, and appropriate combinations thereof. In a hardware implementation, the division between the functional modules / units mentioned in the above description does not necessarily correspond to the division of physical components; for example, a physical component may have multiple functions, or a function or step may be performed by several physical components in cooperation. Some or all physical components may be implemented as software executed by a processor (such as a central processing unit, a digital signal processor, or a microprocessor), or implemented as hardware, or implemented as an integrated circuit, such as an application-specific integrated circuit. Such software may be distributed on a computer-readable medium, which may include a computer storage medium (or non-transitory medium) and a communication medium (or temporary medium). As is well known to those skilled in the art, the term computer storage medium includes volatile and non-volatile, removable, and non-removable media implemented in any method or technology for storing information (such as computer-readable instructions, data structures, program modules, or other data). Computer storage media includes, but is not limited to, RAM, ROM, EEPROM, flash memory or other memory technology, CD-ROM, digital versatile disks (DVD) or other optical disk storage, magnetic cassettes, magnetic tape, magnetic disk storage or other magnetic storage, or any other medium that can be used to store the desired information and can be accessed by a computer. In addition, as is well known to those skilled in the art, communication media typically embodies computer-readable instructions, data structures, program modules, or other data in a modulated data signal such as a carrier wave or other transport mechanism, and may include any information delivery media.

[0111] Example embodiments have been disclosed herein, and although specific terms are employed, they are used and should be interpreted only in a general illustrative sense and not for purposes of limitation. In some instances, it will be apparent to those skilled in the art that, unless otherwise expressly stated, features, characteristics, and / or elements described in conjunction with a particular embodiment may be used alone or in combination with features, characteristics, and / or elements described in conjunction with other embodiments. Therefore, it will be understood by those skilled in the art that various changes in form and detail may be made without departing from the scope of the present application as set forth in the appended claims.

Claims

1. A service transmission method, applied to an edge optical transmission network device, includes: Receiving a first service message sent by a customer-side device; Mapping the first service message into an optical transmission network container corresponding to the first service message according to a service identifier in the first service message, and transmitting the optical transmission network container mapped with the first service message.

2. The service transmission method according to claim 1, wherein, The service identifier includes: a source service identifier and a destination service identifier; The mapping the first service message into an optical transmission network container corresponding to the first service message according to the service identifier in the first service message, and transmitting the optical transmission network container mapped with the first service message includes: Searching a first service routing table according to the destination service identifier, and obtaining an optical transmission network channel label corresponding to the service identifier when the routing information corresponding to the destination service identifier is found in the first service routing table; wherein, the routing information is determined according to service level agreement requirements corresponding to the first service message; Mapping the first service message into the optical transmission network container corresponding to the optical transmission network channel label; and transmitting the optical transmission network container mapped with the first service message according to the routing information.

3. The service transmission method according to claim 2 further includes: Before mapping the first service message into the optical transmission network container corresponding to the optical transmission network channel label, removing an Ethernet header in the first service message to obtain a second service message; The mapping the first service message into the optical transmission network container corresponding to the optical transmission network channel label includes: mapping the second service message into the optical transmission network container corresponding to the optical transmission network channel label; The transmitting the optical transmission network container mapped with the first service message according to the routing information includes: transmitting the optical transmission network container mapped with the second service message according to the routing information.

4. The service transmission method according to any one of claims 2 to 3, wherein, The obtaining the optical transmission network channel label corresponding to the service identifier includes: Searching a service mapping table according to the service identifier in the first service message; Obtaining the found optical transmission network channel label when the optical transmission network channel label corresponding to the service identifier is found in the service mapping table.

5. According to the service transmission method according to any one of claims 2 to 3, the obtaining the optical transmission network channel label corresponding to the service identifier includes: Searching a service mapping table according to the service identifier in the first service message; When the optical transmission network channel label corresponding to the service identifier cannot be found in the service mapping table, sending a channel label obtaining request to a software-defined network service controller; and receiving the optical transmission network channel label sent by the software-defined network service controller.

6. The service transmission method according to any one of claims 2 to 3, wherein, The optical transmission network channel label includes cross-configuration information of nodes on a service transmission path corresponding to the first service message; Wherein, the service transmission path is determined according to service level agreement requirements corresponding to the first service message.

7. A service transmission method, applied to an edge optical transmission network device, includes: Receive an optical transport network container sent by a network-side device, and demap service packets from the optical transport network container; Forward the service packets to a target customer-side device according to the service identifier in the service packets.

8. The service transmission method according to claim 7, wherein, The service identifier includes a source service identifier and a destination service identifier; The step of forwarding the service packets to a target customer-side device according to the service identifier in the service packets includes: Search for a first service routing table according to the destination service identifier, and forward the service packets to the target customer-side device according to the routing information corresponding to the destination service identifier found in the first service routing table; wherein, the routing information is determined according to the service level agreement requirements corresponding to the service packets.

9. The service transmission method according to any one of claims 7 to 8, further comprising: After demapping the service packets from the optical transport network container and before forwarding the service packets to the target customer-side device according to the service identifier in the service packets, when the service packets do not include an Ethernet header, obtain the address of the target customer-side device; Add an Ethernet header to the service packets according to the address of the edge optical transport network device and the address of the target customer-side device.

10. The service transmission method according to any one of claims 7 to 8, further comprising: After demapping the service packets from the optical transport network container and before forwarding the service packets to the target customer-side device according to the service identifier in the service packets, when the service packets include an Ethernet header, obtain the address of the target customer-side device; Update the Ethernet header in the service packets according to the address of the edge optical transport network device and the address of the target customer-side device.

11. An electronic device, comprising: At least one processor; A memory, on which at least one computer program is stored, and when the at least one computer program is executed by the at least one processor, the at least one processor implements the service transmission method according to any one of claims 1 to 10.

12. A computer-readable storage medium, on which a computer program is stored, and when the computer program is executed by a processor, the processor implements the service transmission method according to any one of claims 1 to 10.

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