Method for transmitting 1588v2 message in microwave system

Abstract

The invention discloses a method of transmitting a 1588v2 message in a microwave system. The microwave system comprises digital microwave devices arranged at two transmitting ends, the digital microwave device at each end comprises an indoor unit and an outdoor unit, the FPGA of the indoor unit comprises an MII interface module, a 1588v2 frame analyzing buffering module, an uplink 1588v2 frame buffering module, an upstream ordinary frame flow controlling buffering module, a receiving end counter module, a sending end counter module, a downlink 1588v2 frame buffering module, a downstream ordinary frame flow controlling buffering module and a business set framing / framing-dividing module. Ethernet package including the 1588v2 message can be transmitted in fixed time delay in an existing digital microwave system through adding and adjusting an algorithm of time delay of package including the 1588v2 message in the microwave system, and therefore the achievement of the 1588v2 protocol is not affected when a digital microwave system replaces optical fibers to transmit data information among PTN devices.

Description

technical field [0001] The present invention relates to the field of microwave transmission, in particular to a digital microwave transmission system that replaces optical fibers and is serially connected between PTN (Package Transport Network, packet transmission network) devices to transmit 1588v2 messages, so that the system contains 1588v2 messages in the transmission process The method of keeping the transparent transmission delay of Ethernet frames fixed. Background technique [0002] The digital microwave transmission system is an important supplementary equipment in the access network of the mobile communication system. It can replace optical fiber for transmission in scenarios where optical fiber is inconvenient to lay. It mainly plays the role of extending the coverage of PTN equipment and eliminating blind spots. At present, operators have deployed and applied it in large quantities. [0003] IEEE1588v2 specifies the industry's mainstream precision clock synchron...

AI Technical Summary

Problems solved by technology

In traditional digital microwave equipment, after receiving data packets, the local end reframes and undergoes modulation and other processes. The digital signal is converted from baseband to intermediate frequency, then to radio frequency, and finally transmitted by the wireless microwave link to the peer microwave receiver. Revert to radio frequency, intermediate frequency to baseband, etc., then deframe and divide the frame, and transmit the Ethernet frame to the FPGA (Field Programmable Gate Array) of the opposite Ethernet disk. After the signal is processed by multiple stages, the delay is difficult to achieve The jitter in the range of nanoseconds cannot meet the delay requirements of the 1588v2 protocol

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