Sleep-Based Energy-Efficient DBA in an EPON Using the Controlling Mechanism for an ONU&#x2019;s Buffer Occupancy and Packet Delay

Ganbold Shagdar; Junsu Kim; Chang-Soo Park

doi:10.1364/JOCN.7.001001

Journal of Optical Communications and Networking
Vol. 7,
Issue 10,
pp. 1001-1008
(2015)
•https://doi.org/10.1364/JOCN.7.001001

Sleep-Based Energy-Efficient DBA in an EPON Using the Controlling Mechanism for an ONU’s Buffer Occupancy and Packet Delay

Ganbold Shagdar, Junsu Kim, and Chang-Soo Park

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Ganbold Shagdar, Junsu Kim, and Chang-Soo Park, "Sleep-Based Energy-Efficient DBA in an EPON Using the Controlling Mechanism for an ONU’s Buffer Occupancy and Packet Delay," J. Opt. Commun. Netw. 7, 1001-1008 (2015)

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Abstract

We propose an energy-efficient dynamic bandwidth allocation (EE-DBA) in an Ethernet passive optical network. In the proposed EE-DBA, the eligibility of optical network units (ONUs) to enter a power-saving mode is investigated based on their buffer occupancy and packet delay conditions that satisfy the user’s quality of service (QoS) requirement. These conditions are easily obtained through the multipoint control protocol that is exchanged between the optical line terminal and the ONUs. The performance of the proposed EE-DBA is evaluated through simulations, and the results show that the power consumption of ONUs could be reduced by about 53% without sacrificing the user’s QoS requirement under light and moderate traffic loads.

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Notation	Description
$R_{j}^{n - i}$	Bandwidth request of the ${ONU}_{j}$ in the $(n - i)$ th cycle measured in bytes
$B_{j}^{n - i}$	Allocated bandwidth of the ${ONU}_{j}$ in the $(n - i)$ th cycle measured in bytes
$t_{j start}^{n - i}$	Transmission start time of $B_{j}^{n - i}$ for the ${ONU}_{j}$ in the $(n - i)$ th cycle measured in seconds
$t_{c j}^{n - i}$	ONU transmission completion time of the ${ONU}_{j}$ in the $(n - i)$ th cycle measured in seconds
$Q_{j NewArr}^{n - i}$	Newly arrived packets at the ${ONU}_{j}$ buffer during $t_{c j}^{n - i}$ time in the $(n - i)$ th cycle measured in bytes
$Q_{j Acc}^{n}$	Accumulated packets (i.e., buffer occupancy) in the ${ONU}_{j}$ ’s buffer corresponding to the end of $t_{c j}^{n}$ measured in bytes
$T_{j Del}^{n}$	Packet delay of the queued packet in the ${ONU}_{j}$ ’s buffer to be transmitted within the allocated bandwidth in the current cycle (i.e., $B_{j}^{n}$ ) measured in seconds
$R_{N}$	Network data rate measured in bits per second

Items	Unit	Quantity
Number of ONUs ( $N$ )		16
Maximum cycle time ( $T_{c \max}$ )	ms	1
Guard time ( $T_{g}$ )	μs	5
Network data rate ( $R_{N}$ )	Gbps	1
Maximum user data rate ( $R_{u}$ )	Mbps	100
Packet size (uniformly distributed)	byte	64–1518
ONU power consumption in active mode [14]	W	3.85
ONU power consumption in doze mode [14]	W	1.7
OLT–ONU distance	km	10–20

Notation	Description
$R_{j}^{n - i}$	Bandwidth request of the ${ONU}_{j}$ in the $(n - i)$ th cycle measured in bytes
$B_{j}^{n - i}$	Allocated bandwidth of the ${ONU}_{j}$ in the $(n - i)$ th cycle measured in bytes
$t_{j start}^{n - i}$	Transmission start time of $B_{j}^{n - i}$ for the ${ONU}_{j}$ in the $(n - i)$ th cycle measured in seconds
$t_{c j}^{n - i}$	ONU transmission completion time of the ${ONU}_{j}$ in the $(n - i)$ th cycle measured in seconds
$Q_{j NewArr}^{n - i}$	Newly arrived packets at the ${ONU}_{j}$ buffer during $t_{c j}^{n - i}$ time in the $(n - i)$ th cycle measured in bytes
$Q_{j Acc}^{n}$	Accumulated packets (i.e., buffer occupancy) in the ${ONU}_{j}$ ’s buffer corresponding to the end of $t_{c j}^{n}$ measured in bytes
$T_{j Del}^{n}$	Packet delay of the queued packet in the ${ONU}_{j}$ ’s buffer to be transmitted within the allocated bandwidth in the current cycle (i.e., $B_{j}^{n}$ ) measured in seconds
$R_{N}$	Network data rate measured in bits per second

Items	Unit	Quantity
Number of ONUs ( $N$ )		16
Maximum cycle time ( $T_{c \max}$ )	ms	1
Guard time ( $T_{g}$ )	μs	5
Network data rate ( $R_{N}$ )	Gbps	1
Maximum user data rate ( $R_{u}$ )	Mbps	100
Packet size (uniformly distributed)	byte	64–1518
ONU power consumption in active mode [14]	W	3.85
ONU power consumption in doze mode [14]	W	1.7
OLT–ONU distance	km	10–20

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Journal of Optical Communications and Networking