CPC H04B 1/7073 (2013.01) [H04L 7/0087 (2013.01); H04L 7/0331 (2013.01); H04Q 9/00 (2013.01); H04W 4/38 (2018.02); H04W 72/0446 (2013.01); H04B 2201/709718 (2013.01); H04Q 2209/60 (2013.01)] | 20 Claims |
10. A network, comprising:
a first metrology unit of a first network node to obtain first data indicating a first zero-crossing at a first time;
a second metrology unit of a second network node to obtain a packet comprising second data indicating a second zero-crossing at a second time; and
a processor of the first network node to:
obtain the packet comprising the second data, the packet comprising at least one free-run timer value defining a period between the second zero-crossing until a time of transmission of the packet;
record, at the first network node, a time of reception of the packet, the time of reception being based at least in part on a reception of the packet;
determine a time difference between the first zero-crossing and the second zero-crossing, wherein the time difference is based at least in part on the first data, the second data, the time of reception of the packet, and a latency defined by a time taken for the packet to propagate through at least one layer of at least one of the first metering device and the second metering device; and
determining, by operation of the processor of the first metering device, a phase difference between the first zero-crossing and the second zero-crossing based at least in part on the determined time difference.
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