Ranging method and system for passive optical network and optical network unit thereof
AssigneeHuawei Technologies Co., Ltd.
InventorsXiaogeng Xu, Chan Zhao
Life of this patent
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Abstract
A ranging method and system for passive optical network, and an optical network unit are provided. The ranging method includes: sending an initial ranging signal to a splitter loop-back device and recording a current sending time as a first time; receiving a loop-back ranging signal from the splitter loop-back device, and determining whether the loop-back ranging signal is a return signal of the initial ranging signal; if the loop-back ranging signal is a return signal of the initial ranging signal, recording a current receiving time as a second time; and obtaining ranging information by calculating a difference between the first time and the second time, and performing a ranging on the basis of the ranging information.
Claims15
A ranging method for use by an optical network unit (ONU) in a ranging system of a passive optical network that comprises the ONU and a splitter loop-back device, comprising:
- sending, by the ONU, an initial ranging signal to the splitter loop-back device and recording a current sending time as a first time;
- receiving, by the ONU, a loop-back ranging signal from the splitter loop-back device, and
- determining, by the ONU, whether the loop-back ranging signal is a return signal of the initial ranging signal;
- if the loop-back ranging signal is a return signal of the initial ranging signal, recording, by the ONU, a current receiving time of the loop-back ranging signal as a second time;
- obtaining, by the ONU, ranging information by calculating a difference between the first time and the second time;
- and
- performing, by the ONU, a ranging on the basis of the ranging information.
A ranging system for a passive optical network, comprising:
- a splitter loop-back device, and an optical network unit;
- wherein
- the splitter loop-back device is configured to perform a loop-back operation which generates a loop-back ranging signal based on an initial ranging signal received from the optical network unit, and send the loop-back ranging signal to the optical network unit;
- the optical network unit is configured to send the initial ranging signal and record a current sending time as a first time;
- receive the loop-back ranging signal from the splitter loop-back device, determine whether the loop-back ranging signal is a return signal of the initial ranging signal, and record a current receiving time as a second time;
- and, if the loop-back ranging signal is the return signal of the initial ranging signal, obtain ranging information by calculating a difference between the first time and the second time, and perform a ranging on the basis of the ranging information.
An optical network unit, which is in communication with a splitter loop-back device, the optical network unit comprising:
- a clocking unit, configured to record a first time at which an initial ranging signal is sent to the splitter loop-back device, and a second time at which a loop-back ranging signal is received from the splitter loop-back device;
- a controlling unit, configured to send the initial ranging signal, receive the loop-back ranging signal, obtain ranging information by calculating a difference between the first time and the second time recorded in the clocking unit if it is determined that the loop-back ranging signal is a return signal of the initial ranging signal, and perform a ranging on the basis of the ranging information.
Dependencies are inferred from the claim text.