Patent ID: 11881931
Assignee: HUAWEI TECHNOLOGIES CO., LTD.
Field: Telecommunications (Electrical engineering)
Classification: CPC H | IPC H

Claim 14:
15. A data transmission time obtaining system, wherein the system is applied to a power line communication (PLC) network, and the system comprises a first device and a second device, wherein
the first device is configured to: send a first packet to a second device, and obtain a first send timestamp of the first packet;
the second device is configured to: receive the first packet, and send a second packet to the first device; and
the first device is further configured to: receive the second packet, and obtain a first receive timestamp of the second packet; determine timing frequency of the second device based on timing frequency of the first device and a frequency offset between the timing frequency of the first device and the timing frequency of the second device; determine, based on the timing frequency of the second device, a second receive timestamp at which the second device receives the first packet and a second send timestamp at which the second device sends the second packet; and determine a data transmission time between the first device and the second device based on the first send timestamp, the first receive timestamp, the second send timestamp, and the second receive timestamp.