Method And Apparatus For Time Transport In A Communication Network
AssigneeAlcatel-Lucent USA Inc.
InventorWilliam E Powell
Life of this patent
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Abstract
A method and apparatus for synchronizing nodes in a communication network. A such as an EPoC, PON, or EPoC/PON hybrid access network. The network node receives or originates a ToD value and calculates future ToD value for a second node, which the first node includes in a ToD message for sending to the second node. The ToD message preferably includes a correction based on an OFDM ranging delay value and an adjustment based on a total transmit/receive PHY path asymmetry value with respect to the two nodes. A similar future ToD message is preferably sent to each downstream node that the first node is serving.
Claims20
A method of facilitating synchronization of nodes in a communication network, comprising:
- performing OFDM ranging by a first node to determine an OFDM ranging delay value for transmissions between the first node and a second node;
- receiving a ToD value at the first node;
- and
- calculating by the first node a future ToD value for the second node based on at least the received ToD value and a ToD correction value based at least on the determined OFDM ranging delay value.
A machine-readable storage medium embodying program instructions that when executed by one or more processors cause a first network node to:
- perform OFDM ranging to determine an OFDM ranging delay value for transmissions between the first node and a second node;
- receive a ToD value at the first node;
- and
- calculating by the first node a future ToD value for the second node based on at least the received ToD value and a ToD correction value based at least on the determined OFDM ranging delay value.
Dependencies are inferred from the claim text.