Patent · US Active

Method of recovery from sleep state of an ONU in a PON system capable of power saving

US8705965B2 · kind B2 · utility

4Cited by

16References

10Claims

0Family size

Assignee

HITACHI, LTD. · JP

Inventors

Jun Sugawa · Tokyo, JP
Hiroki Ikeda · Hachioji, JP
Tohru Kazawa · Kokubunji, JP

Key dates

Filing date	Jan 10, 2011
Grant date	Apr 22, 2014
Priority date	—
Expiry date	Jul 20, 2032

Classification

Technology area (CPC H)Electricity
CPC primaryH04Q2011/0079
WIPO fieldTelecommunications
WIPO sectorElectrical engineering

Abstract

There is a need to recover an ONU from a sleep state for communication with the PON before a specified sleep cancel time in a short period of time without degrading the band use efficiency. An OLT manages an electric state of each ONU connected to a PON. When at least one ONU is in sleep mode, the OLT transmits a grant to allocate a band for a sleep cancel report to the ONU. When the sleep-mode ONU requires communication, the ONU transmits the sleep cancel report to the OLT using the band for the sleep cancel report. When receiving the sleep cancel report, the OLT changes the managed ONU to a normal state and resumes the communication with the PON.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.