US-12627911-B2 - Transmission method, apparatus, and system

Abstract

In accordance with an embodiment, an optical head end generates uplink grant information of periodic data based on configuration information of the periodic data from a controller, where the uplink grant information of the periodic data is continuously valid within a threshold time range, and indicates a corresponding transmission slot of sending the periodic data by an optical terminal. The optical head end sends the uplink grant information of the periodic data to the optical terminal.

Inventors

• Lun ZHANG
• Gang Zheng

Assignees

• HUAWEI TECHNOLOGIES CO., LTD.

Dates

Publication Date

20260512

Application Date

20231018

Priority Date

20210419

Claims (20)

1. 1 . A transmission method, comprising: generating, by an optical head end, uplink grant information of periodic data based on configuration information of the periodic data from a controller, wherein the uplink grant information of the periodic data indicates a corresponding transmission slot of sending the periodic data by an optical terminal, and the uplink grant information of the periodic data is continuously valid within a threshold time range; and sending, by the optical head end, the uplink grant information of the periodic data to the optical terminal in a pre-configuration phase.
2. 2 . The method according to claim 1 , wherein the uplink grant information of the periodic data is continuously valid within the threshold time range by being continuously valid before the optical head end reconfigures the uplink grant information of the periodic data.
3. 3 . The method according to claim 1 , wherein the uplink grant information of the periodic data is carried in an administration and maintenance message in a frame structure sent by the optical head end to the optical terminal.
4. 4 . The method according to claim 3 , wherein: the uplink grant information of the periodic data is carried in a physical layer operations, administration and maintenance downstream PLOAMd message in the frame structure sent by the optical head end to the optical terminal, and the PLOAMd message comprises a correspondence between an optical terminal identifier and a periodic data transmission slot; or the uplink grant information of the periodic data is carried in an ONT management and control interface OMCI message in the frame structure sent by the optical head end to the optical terminal, and the OMCI message comprises the correspondence between the optical terminal identifier and the periodic data transmission slot.
5. 5 . The method according to claim 1 , wherein the method further comprises: determining, by the optical head end, uplink grant information of aperiodic data after receiving an aperiodic data request from the controller, wherein the uplink grant information of the aperiodic data indicates a corresponding transmission slot of sending the aperiodic data by the optical terminal; and sending, by the optical head end, the aperiodic data request and the uplink grant information of the aperiodic data to the optical terminal.
6. 6 . The method according to claim 5 , wherein the transmission slot corresponding to the aperiodic data is a remaining slot other than the transmission slot corresponding to the periodic data.
7. 7 . The method according to claim 1 , wherein the uplink grant information of the periodic data comprises: at least one information group, wherein each optical terminal of a plurality of optical terminals corresponds to at least one information group, and each information group comprises an allocation number, a start time, and a grant size.
8. 8 . A transmission method, comprising: collecting, by an optical terminal, periodic data corresponding to a secondary station after receiving a periodic data request from an optical head end; determining, by the optical terminal based on received uplink grant information of the periodic data from the optical head end, a corresponding transmission slot for sending the periodic data, wherein the uplink grant information of the periodic data is continuously valid within a threshold time range; and sending, by the optical terminal, the periodic data to the optical head end based on the transmission slot corresponding to the periodic data.
9. 9 . The method according to claim 8 , wherein the uplink grant information of the periodic data is continuously valid within the threshold time range by being continuously valid before the optical head end reconfigures the uplink grant information of the periodic data.
10. 10 . The method according to claim 8 , wherein the uplink grant information of the periodic data is received by the optical terminal from the optical head end in a pre-configuration phase.
11. 11 . The method according to claim 8 , wherein the uplink grant information of the periodic data is carried in an administration and maintenance message in a frame structure sent by the optical head end to the optical terminal.
12. 12 . The method according to claim 11 , wherein: the uplink grant information of the periodic data is carried in a PLOAMd message in the frame structure sent by the optical head end to the optical terminal, and the PLOAMd message comprises a correspondence between an optical terminal identifier and a periodic data transmission slot; or the uplink grant information of the periodic data is carried in an OMCI message in the frame structure sent by the optical head end to the optical terminal, and the OMCI message comprises the correspondence between the optical terminal identifier and the periodic data transmission slot.
13. 13 . The method according to claim 8 , wherein the method further comprises: receiving, by the optical terminal, an aperiodic data request and uplink grant information of aperiodic data from the optical head end, wherein the uplink grant information of the aperiodic data indicates a corresponding transmission slot of sending the aperiodic data by the optical terminal; and sending, by the optical terminal, the aperiodic data to the optical head end based on the transmission slot corresponding to the aperiodic data.
14. 14 . The method according to claim 13 , wherein the transmission slot corresponding to the aperiodic data is a remaining slot other than the transmission slot corresponding to the periodic data.
15. 15 . The method according to claim 8 , wherein the uplink grant information of the periodic data comprises: at least one information group, wherein each optical terminal of a plurality of optical terminals corresponds to at least one information group, and each information group comprises an allocation number, a start time, and a grant size.
16. 16 . An optical head end, comprising: a transceiver; one or more processors coupled to the transceiver; and a memory with instructions stored thereon, wherein the instructions, when executed by the one or more processors, enable the one or more processors to: generate uplink grant information of periodic data based on configuration information of the periodic data from a controller, wherein the uplink grant information of the periodic data indicates a corresponding transmission slot of sending the periodic data by an optical terminal, and the uplink grant information of the periodic data is continuously valid within a threshold time range; and send the uplink grant information of the periodic data to the optical terminal in a pre-configuration phase.
17. 17 . The optical head end according to claim 16 , wherein the uplink grant information of the periodic data is configured to be continuously valid within the threshold time range by being continuously valid before the optical head end reconfigures the uplink grant information of the periodic data.
18. 18 . The optical head end according to claim 16 , wherein the uplink grant information of the periodic data is configured to be carried in an administration and maintenance message in a frame structure sent by the optical head end to the optical terminal.
19. 19 . The optical head end according to claim 18 , wherein: the uplink grant information of the periodic data is carried in a physical layer operations, administration and maintenance downstream PLOAMd message in the frame structure sent by the optical head end to the optical terminal, and the PLOAMd message comprises a correspondence between an optical terminal identifier and a periodic data transmission slot; or the uplink grant information of the periodic data is carried in an ONT management and control interface OMCI message in the frame structure sent by the optical head end to the optical terminal, and the OMCI message comprises the correspondence between the optical terminal identifier and the periodic data transmission slot.
20. 20 . An optical terminal, comprising: a transceiver; one or more processors coupled to the transceiver; and a memory with instructions stored thereon, wherein the instructions, when executed by the one or more processors, enable the one or more processors to: collect periodic data corresponding to a secondary station after receiving a periodic data request from an optical head end; determine, based on received uplink grant information of the periodic data from the optical head end, a corresponding transmission slot of sending the periodic data, wherein the uplink grant information of the periodic data is continuously valid within a threshold time range; and send the periodic data to the optical head end based on the transmission slot corresponding to the periodic data.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS This application is a continuation of International Application No. PCT/CN2022/079519, filed on Mar. 7, 2022, which claims priority to Chinese Patent Application No. 202110419412.9, filed on Apr. 19, 2021. The disclosures of the aforementioned applications are hereby incorporated by reference in their entireties. TECHNICAL FIELD This application relates to the field of communication technologies, and in particular, to a transmission method, apparatus, and system. BACKGROUND With rapid development of science and technology, there are higher requirements on stability and costs of communication between devices. Therefore, a field bus is emerging. A plurality of control devices may be mounted on a pair of twisted pairs of a field bus. This provides a user with more flexible initiative in system integration, effectively resolves problems of digital communication between field devices such as intelligent instruments, controllers, and actuators in the industrial field, and information transmission between these field control devices and advanced control systems, and improves system reliability. However, existing field bus networks all have operating cycles at a millisecond (ms) level, which cannot meet a higher level requirement for a lower delay in future industrial manufacturing. Therefore, how to implement communication with a lower delay in the field bus network is a technical problem to be resolved urgently. SUMMARY Some embodiments disclosed in the application provide a transmission method, apparatus, and system, to reduce a delay and a delay jitter in a process of transmitting downlink service data. To support an industrial control service scenario that requires a low delay or a high bandwidth, in a possible implementation, it is considered that a passive optical network (PON) is introduced into the industrial control field. In an optional implementation of embodiments of this application, a PON system may include a controller, an optical head end, and at least one optical terminal. In an optional implementation of embodiments of this application, the optical head end may be an OLT. In other words, the OLT can implement a function of the optical head end. In an optional implementation of embodiments of this application, the optical terminal may be an ONU, and/or may be an ONT. In other words, the ONT or the ONU can implement a function of the optical terminal. It should be noted that the optical head end and the controller may be deployed separately, or may be deployed in an integrated manner. In other words, the optical head end and the controller may be deployed on different physical devices, or may be deployed on a same physical device. In other words, the optical head end and the controller may be two independent physical devices, or may be two functional modules in a same physical device. In addition, the optical terminal and the secondary station may be deployed separately, or may be deployed in an integrated manner. In other words, the optical terminal and the secondary station are independent and different physical devices, or the optical terminal and the secondary station may be integrated devices. This is not limited in this application. Herein, the PON system in this embodiment of this application may be, for example, a gigabit-capable passive optical network (gigabit-capable PON, GPON) system or an Ethernet passive optical network (Ethernet PON, EPON) system, a 10 gigabit Ethernet passive optical network (10G-EPON) system, a time division and wavelength division multiplexing passive optical network (TWDM-PON) system, a 10-gigabit-capable passive optical network (XG-PON) system, or a 10-gigabit-capable symmetric passive optical network (XGS-PON) system. With emergence of a new technology that evolves in the future, a rate of the PON system may be increased to 25 Gbps, 50 Gbps, or even 100 Gbps. Therefore, the optical communication system may alternatively be a PON system with a higher transmission rate. This is not limited in this application. In a possible implementation, the foregoing PON system may be a PON system that supports a single wavelength. Optionally, the PON system may further include a field control device. The field control device is, for example, a transmission device (such as a servo driver and a servo motor), a sensing device (such as a sensor), or an input/output (I/O) device. It should be understood that these field control devices may be collectively referred to as secondary stations. In a first aspect, this application provides a communication method. The method may be applied to an optical bus network. The optical bus network includes an optical head end, a controller, and at least one optical terminal. The method includes: The optical head end generates uplink grant information of periodic data based on configuration information of the periodic data from the controller, where the uplink grant information of the periodic data indicate