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Systems and methods for avoiding delays for ULL traffic

專利號(hào)
US11134506B2
公開日期
2021-09-28
申請(qǐng)人
Nokia Technologies Oy
發(fā)明人
Edward Harstead; Rene Bonk; Michael Straub
IPC分類
H04W72/12; H04B10/27; H04B10/2575; H04W28/02
技術(shù)領(lǐng)域
olt,traffic,ull,pon,onu,onus,or,window,du,windows
地域: Espoo

摘要

Delays in the transmission of ULL traffic are avoided or substantially reduced by the initiation of opportunistic and probability-based in-band, traffic-free time period windows that do not correspond to time periods of ULL traffic transmissions.

說明書

RELATED APPLICATION

This application is related to, and claims the benefit of priority from, U.S. Provisional Application No. 62/787,746 filed Jan. 2, 2019 (the “'746 Application”). This application incorporates by reference the entirety of the disclosure of the '746 Application as if such disclosure were set forth in full herein.

INTRODUCTION

This section introduces aspects that may be helpful to facilitate a better understanding of the described invention(s). Accordingly, the statements in this section are to be read in this light and are not to be understood as admissions about what is, or what is not, in the prior art.

A time-division multiplexed (TDM), passive optical network (PON) uses time-division, multiple access (TDMA) to multiplex upstream telecommunications transmissions from a plurality of optical network units (ONUs) to an optical line terminal (OLT).

In order to avoid interference or “collisions” between these upstream transmissions, existing OLTs typically allocate non-overlapping upstream timeslots of varying length to each of the ONUs, and then transmit “grants” to the ONUs, where each grant includes information (e.g., electronic bits) that instructs each ONU as to the point in time it may begin a transmission and when it must end the transmission (e.g., a starting point for its respective time slot and the length of such a timeslot).

權(quán)利要求

1
We claim:1. A system for identifying traffic-free, in-band time period windows (“traffic windows”) comprising:a device operable to,identify one or more patterns of re-occurring and unused or unallocated frames or subframes; andselect one or more frames or subframes within an identified pattern based on stored values for each frame and subframe, the values indicative of the probability that the selected frames or subframes may be re-occurring and unused or unallocated, for use as a part of one of the traffic windows based on the stored probability values.2. The system as in claim 1, wherein the device is further operable to analyze stored bandwidth maps or frame or subframe allocations and identify the one or more patterns of re-occurring and unused or unallocated frames or subframes based on the analysis of the maps or allocations.3. The system as in claim 1 where the device is further operable to generate a schedule of traffic windows, wherein each window is scheduled to correspond to a time period that does not substantially, adversely affect ULL traffic transmissions.4. The system as in claim 1 wherein the device comprises an optical line terminal.5. The system as in claim 2 wherein the device is further operable to receive the frame and subframe allocations from a base station, central unit (CU) or distributed unit (DU).6. The system as in claim 5 wherein the device is further operable to receive the frame and subframe allocations from the base station, CU or DU in accordance with a Cooperative DBA or CTI protocol.7. The system as in claim 5 wherein the device is further operable to send an indication to the base station, CU or DU to inform the base station, CU or DU that the device will control scheduling of traffic windows.8. The system as in claim 1 further comprising a base station CU or DU operable to receive an indication that the device will control scheduling of traffic windows.9. The system as in claim 3 wherein the schedule further comprises start times for initiation of one or more of the in-band traffic-free time period windows.10. The system as in claim 1 wherein the device is further operable to set a threshold time limit value, and determine whether or not a time period since the initiation of a last in-band, traffic-free time period window exceeds the threshold value.11. The system as in claim 10 wherein the device is further operable interrupt ULL traffic transmissions and initiate an in-band, traffic-free time period window if the threshold time limit value has been exceeded.12. A method for identifying traffic-free, in-band time period windows (“traffic windows”) comprising:identifying one or more patterns of re-occurring and unused or unallocated frames or subframes; andselecting one or more frames or subframes within an identified pattern based on stored values for each frame and subframe, the values indicative of the probability that the selected frames or subframes may be re-occurring and unused or unallocated, for use as a part of one of the traffic windows based on the stored probability values.13. The method as in claim 12 further comprising analyzing stored bandwidth maps or frame or subframe allocations and identifying the one or more patterns of re-occurring and unused or unallocated frames or subframes based on the analysis of the maps or allocations.14. The method as in claim 12 further comprising generating a schedule of traffic windows, wherein each window is scheduled to correspond to a time period that does not substantially, adversely affect ultra-low latency traffic transmissions.15. The method as in claim 13 further comprising receiving the frame and subframe allocations from a base station, central unit (CU) or distributed unit (DU).16. The method as in claim 15 further comprising receiving the frame and subframe allocations from the base station, CU or DU in accordance with a Cooperative DBA or CTI protocol.17. The method as in claim 15 further comprising sending an indication to the base station, CU or DU to inform the base station, CU or DU that the base station, CU or DU does not have to control scheduling of traffic windows.18. The method as in claim 12 further comprising receiving at a base station CU or DU an indication that the base station, CU or DU does not have to control scheduling of windows.19. The method as in claim 14 wherein the schedule further comprises start times for initiation of one or more of the traffic windows.20. The method as in claim 12 further comprising setting a threshold time limit value, and determining whether or not a time period since the initiation of a last traffic window exceeds the threshold value.21. The method as in claim 20 further comprising interrupting ULL traffic transmissions and initiating a traffic window if the threshold time limit value has been exceeded.
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