Adaptive Registration in TWDM-PON With ONU Migrations

Jun Li; Weiqiang Sun; Hongyang Yang; Weisheng Hu

doi:10.1364/JOCN.6.000943

Journal of Optical Communications and Networking
Vol. 6,
Issue 11,
pp. 943-951
(2014)
•https://doi.org/10.1364/JOCN.6.000943

Adaptive Registration in TWDM-PON With ONU Migrations

Jun Li, Weiqiang Sun, Hongyang Yang, and Weisheng Hu

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Jun Li, Weiqiang Sun, Hongyang Yang, and Weisheng Hu, "Adaptive Registration in TWDM-PON With ONU Migrations," J. Opt. Commun. Netw. 6, 943-951 (2014)

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About this Article
History
- Original Manuscript: June 18, 2014
- Revised Manuscript: September 6, 2014
- Manuscript Accepted: September 6, 2014
- Published: October 1, 2014

Abstract

In time and wavelength division multiplexed passive optical networks (TWDM-PONs), optical network unit (ONU) migration (equivalently retuning working wavelength pairs) is an effective approach to reducing power consumption at the optical line terminal (OLT) side. Migration delay, the time from when a migration is initiated until the migrating ONU(s) have successfully joined the target wavelength pair, may affect the user service level agreement (SLA) and should be minimized. After an ONU migration process has been triggered, both the ONUs to be migrated (the migrating ONUs) and the newly incoming ones will have to register (referred to as activation in the ITU-T G.984.3 standard) in the upcoming quiet windows. This makes the number of ONUs competing in a single quiet window much more dynamic and leads to unpredictable registration performance and longer registration delay, which in turn will have a negative impact on the migration delay. In this paper, we propose an adaptive registration scheme in a TWDM-PON with ONU migrations. In the proposed scheme, the size of the quiet window is adaptively adjusted according to the up-to-date number of involved ONUs (including both ONUs to be migrated and the newly incoming ones). We show through simulations that the proposed scheme reduces average migration delay and increases the bandwidth utilization, especially when a large number of ONUs are involved in a registration process. In addition, we further investigate the length of the discovery cycle and find a shorter discovery cycle is needed to reduce migration delay and satisfy the requirement of the ONU SLA for a large number of involved ONUs. To realize a 99.999% ONU SLA, the length of the discovery cycle has to be shorter than 0.1 s for 128 involved ONUs and 0.15 s for 32 involved ONUs.

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Time Variable	Explanation
Discovery cycle $(T_{c})$	The time interval with which the OLT periodically creates a quiet window
Quiet window $(T_{w})$	The time interval during which the OLT temporarily suspends the authorization for upstream transmission and ONUs’ complete registration
Migration interval $(T_{n})$	The time interval with which the OLT periodically performs migration
Migration delay $(T_{m})$	The time from when a migration is initiated until the migrating ONU(s) have successfully joined the target wavelength pairs
Tuning time $(T_{t})$	The time used by migrating ONUs to retune working wavelength pairs
Propagation delay $(T_{d})$	The transmission time from the OLT to an ONU, which is proportional to the ONU’s fiber distance
Equalization delay $(T_{e})$	The time used to compensate for variation of propagation and processing delays of ONUs
ONU response time $(T_{o})$	The time used by an ONU to receive the downstream frame and prepare an upstream response
Starting time $(T_{s})$	The starting time of the upstream frame (in ONU’s view, $T_{s} = 0$ )
Random delay $(T_{r})$	A random variable generated by ONUs used to avoid collisions in the registration process

Step	Actions
1	Calculate the number of ONUs that fail to register in the current discovery cycle $(F)$
2	Calculate the number of migrating ONUs in the upcoming discovery cycle $(M)$
3	Estimate the number of newly incoming ONUs in the current discovery cycle from historical ONU online profiles $(n)$
4	Calculate the total number of ONUs in the upcoming discovery cycle $(S)$ $S = F + M + n$
5	Calculate the maximum random delay
	If $n < S < Threshold$
	$w = R S + \sqrt{R^{2} S^{2} + 2 R S (T + R)}$
	else if $S == n$
	$w = R S + \sqrt{R^{2} n + 2 R n (T + R)}$
	else
	$w = w_{thershold}$
	in which $T$ is the round-trip propagation delay
6	Update the quiet window: $W = T + w + R$
7	Complete the current registration, waiting for the next discovery cycle

Time Variable	Explanation
Discovery cycle $(T_{c})$	The time interval with which the OLT periodically creates a quiet window
Quiet window $(T_{w})$	The time interval during which the OLT temporarily suspends the authorization for upstream transmission and ONUs’ complete registration
Migration interval $(T_{n})$	The time interval with which the OLT periodically performs migration
Migration delay $(T_{m})$	The time from when a migration is initiated until the migrating ONU(s) have successfully joined the target wavelength pairs
Tuning time $(T_{t})$	The time used by migrating ONUs to retune working wavelength pairs
Propagation delay $(T_{d})$	The transmission time from the OLT to an ONU, which is proportional to the ONU’s fiber distance
Equalization delay $(T_{e})$	The time used to compensate for variation of propagation and processing delays of ONUs
ONU response time $(T_{o})$	The time used by an ONU to receive the downstream frame and prepare an upstream response
Starting time $(T_{s})$	The starting time of the upstream frame (in ONU’s view, $T_{s} = 0$ )
Random delay $(T_{r})$	A random variable generated by ONUs used to avoid collisions in the registration process

Step	Actions
1	Calculate the number of ONUs that fail to register in the current discovery cycle $(F)$
2	Calculate the number of migrating ONUs in the upcoming discovery cycle $(M)$
3	Estimate the number of newly incoming ONUs in the current discovery cycle from historical ONU online profiles $(n)$
4	Calculate the total number of ONUs in the upcoming discovery cycle $(S)$ $S = F + M + n$
5	Calculate the maximum random delay
	If $n < S < Threshold$
	$w = R S + \sqrt{R^{2} S^{2} + 2 R S (T + R)}$
	else if $S == n$
	$w = R S + \sqrt{R^{2} n + 2 R n (T + R)}$
	else
	$w = w_{thershold}$
	in which $T$ is the round-trip propagation delay
6	Update the quiet window: $W = T + w + R$
7	Complete the current registration, waiting for the next discovery cycle

Abstract

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Equations (11)

Journal of Optical Communications and Networking