1. Speaker：Pu-Yu Yu​ Date: 2016/10/26
Analysing the optical network unit power consumption in the 10 GB-capable passive optical network systems
Speaker：Pu-Yu Yu​
Date: 2016/10/26
Broadband Wireless Access

2. OUTLINE Introduction XG-PON power management
OUTLINE
Introduction
XG-PON power management
XG-PON power management analysis
Model validation and discussion
Conclusion

3. PREVIEW Passive Optical Network
PREVIEW Passive Optical Network
Passive means : no electricity to power or maintain the transmission facility while doing signal processing.
Only the terminal device need to use electricity, the node between the places only need fiber elements( splitter).
Downlink transmission uses broadcast based on time division multiplexing. Splitter will distribute input optical signal equally by their optical power and transport to optical network users(1 to 16 ,1 to 32 ,1 to 64).
Uplink transmission uses TDMA.

4. PREVIEW Passive Optical Network
PREVIEW Passive Optical Network

5. TDM-PON Point-to-multipoint approach
TDM-PON
Point-to-multipoint approach
Uses a 1:N passive splitter/combiner to divide the optical signal among all users in the downstream direction and aggregate the users’ data
OLT uses DBA algorithm to arbitrate access to the shared channel in the upstream direction, avoid collisions, assign bandwidth to the users, and provide QoS for different types of flows.
Ex: G-PON XG-PON

6. WDM-PON
The power splitter/combiner is replaced by a wavelength selective filter.
Setting up a single wavelength with symmetric bandwidth between each user and the central office. (dedicated point-to-point connection)
Advantages over TDM-PON: scalable bandwidth, Long reach (given the low insertion loss of filters, optional amplification), security

7. TWDM-PON Was selected as the primary solution for the NG-PON stage 2.
TWDM-PON
Was selected as the primary solution for the NG-PON stage 2.
Increases the aggregate PON rate by stacking multiple XGPONs on different pairs of wavelengths. (ONU equipped colorless transmitters)
Advantages: high fan-out, compatible with older TDM-PON versions, coexistence within the same ODN.

8. Summary of features for PON technologies
Summary of features for PON technologies

9. INTRODUCTION
Recently, the 10 GB-capable PON (XG-PON) was introduced as one of the most promising NG-PON systems.
One of the most advanced features enhanced in the XG-PON system is the power saving support for efficient energy management.
Reason :The increasing number of subscriber terminals, optical devices, and transceivers; thus, the related power consumption is expected to increase to a great extent .

10. INTRODUCTION
The XG-PON transmission convergence layer defines the specifications regarding power consumption. According to the ITU-T G recommendations, two power saving modes are defined: the doze and the cyclic sleep modes .
Doze modes : transmitter off but receiver on .
Sleep modes : both transmitter and receiver are off.

11. INTRODUCTION
This paper provide a rigorous analytical framework for computing the average ONU power consumption based on the telecommunication standardisation sector (ITU-T) recommendations.
Aim to associate the power consumed by an ONU with the ONU traffic arrivals, mathematically modelling the power management state machine by using a discrete time Markov chain (DTMC).
Further estimate the average time spent in the doze mode and the cyclic sleep mode.

12. XG-PON network model

13. XG-PON power management
XG-PON power management
The ONU management and control interface (OMCI) constitutes the core signalling mechanism between the ONUs and the OLT.
The XG-PON power management is structured in power state machines.
Two mutually exclusive subsets: the full power and the low-power subsets.

14. XG-PON power management
XG-PON power management
The full power subset consists of two distinct management states: the ActiveHeld and the ActiveFree states.
ActiveHeld: incorporates awake mode with full power consumption.
ActiveFree: ONU monitors the upstream traffic that arrives at the UNI and the downstream traffic that is collected by the service node interface (SNI) located at the OLT to be sent to the ONU in order to decide whether a low-power mode could be applied.

15. XG-PON power management
XG-PON power management
The low-power subset is realised by two low-power saving modes referred to as doze and cyclic sleep modes.
The XG-PON power management defines two pairs of states for each low-power mode.
DozeAware states and the Listen states
SleepAware states and the Asleep states
低耗能的

17. XG-PON power management analysis
XG-PON power management analysis
Let {PM(t), t ∈ T} ,where T = {0, 1, …}.
S = {S1, S2, S3, S4, S5, S6, S7, S8}. This vector represents the ONU power management states as follows: ActiveHeld (S1), ActiveFree (S2), initial DozeAware (S3), Listen (S4), DozeAware (S5), initial SleepAware (S6), Asleep (S7), and SleepAware (S8).
因為初始進入aware狀態的上一個狀態是從active free過來的所以要分開討論

18. XG-PON power management analysis
XG-PON power management analysis
To model the stochastic process PM(t) using a DTMC, the memoryless property should be ensured.
The ONU should not maintain information concerning past transitions such as traffic arrivals.
Downstream frame has a fixed size of 135,432 bytes.
Upstream frame has a fixed size of 38,880 bytes.

21. 1.UD都會上升
2.U上升 D不變
3.U不變 D上升
4.Real traffic 分成三種類 語音通話 即時影音 影音串流
arrival probabilities Pr

22. Average power consumption computation

23. Model validation and discussion
Model validation and discussion

26. Model validation and discussion
Model validation and discussion

27. Conclusion
In this paper, a precise model was presented analysing the ONU power management in XG-PON systems ,consists of a DTMC, which encloses a set of countable states that describe the power management states of an ONU.
The proposed analytical framework focused on the ONU average power consumption estimation, assuming that the ONU is able to support both the doze and cyclic sleep modes.

28. Conclusion
Extensive validation and evaluation results are presented, reflecting the model’s accuracy.
Concurrently, the average power consumption, the average time spent in the Listen state, and the average time spent in the Asleep state were associated to the traffic an ONU experiences in both directions.

29. References http://www.cs.nccu.edu.tw/~lien/NIIslide/PON/hardcopy.htm
References
R. Sanchez, J. A. Hernandez, J. M. Garcia and D. Larrabeiti, "Provisioning 1 Gb/s symmetrical services with next-generation passive optical network technologies,"  IEEE Communications Magazine, vol. 54, no. 2, pp , February 2016.
E-PON IEEE 802.3av standard

30. References
Panagiotis Sarigiannidis, Malamati Louta, Georgios Papadimitriou, Michael Theologou, “Analysing the optical network unit power consumption in the 10 GB-capable passive optical network systems” , The Institution of Engineering and Technology journal , Vol. 5, Iss. 3, pp. 71–79 ,February 2016