C.-T. CHIU, Y.-C. WANG
Copyright © 2013 SciRes. OPJ
170
Compared with 5.12 ms and 1.82 ms queueing delay,
WRR in PAWRR follows a fixed polling order. Times to
serve each TCONT is equal. However, TCONTs with
high and less loads need more and less polling times,
respectively. PARP gives more and less polling times to
TCONTs with high and less loads, respectively. There-
fore, queueing delay of PARP is lower than queueing
delay of PAWRR with setting
1.0.
By different polling times, besides TCONT3, PARP
improves queueing delay of TCONT2 and 4. In the 1.3
Gbps total offered load, four kinds of queueing delay of
TCONT2 of PAWRR with setting
1.0, PAWRR
with setting
1.0, PARP, and PWRR are 8.76 ms,
8.76 ms, 2.10 ms, and 8.76 ms, respectively. In the 0.6
Gbps total offered load, four kinds of queueing delay of
TCONT4 of PAWRR with setting
1.0, PAWRR
with setting
1.0, PARP, and PWRR are 2.87 ms,
2.80 ms, 1.27 ms, and 2.81 ms, respectively.
4. Conclusions
We propose request-based DBA called PARP in GPON.
PARP allocates min-max bandwidth with weights for
critical values. When weights are assigned in proportion
to request bandwidth, non-assured bandwidth is allocated
more and less to high and less request bandwidth
TCONT3, respectively. Non-assured bandwidth is adapted
so that it adapts varying request bandwidth. Beside the
bandwidth allocation, request-based polling is used to
poll the highest request bandwidth TCONTs in the same
type. PARP allocates more bandwidth to TCONTs of
high request bandwidth. By a C program, simulations are
evaluated when total offered loads are or are not uni-
formly shared to TCONTs. Simulative results indicate
queueing delay in proportion to request bandwidth is
better than one in proportion to guaranteed bandwidth
and critical values. Simulative results also indicate
queueing delay is improved when the polling order is
chosen high request bandwidth TCONTs.
REFERENCES
[1] ITU Rec. G.984.1, “Gigabit-Capable Passive Optical
Networks (G-PON): General Characteristics,” Geneva,
Switzerland, 2003.
[2] M. Mcgarry, M. Maier and M. Reisslein, “Ethernet Pas-
sive Optical Network (EPON): Building A
Next-Generation Optical Access Network,” IEEE Com-
munications Magazine, Vol. 40, No. 2, 2002, pp. 66-73.
doi:10.1109/35.983910
[3] D. Angelopoulos, S. Venieris and I. Stassinopoulos, “A
TDMA Based Access Control Scheme for APON's,”
Journal of Lightwave Technology, Vol. 11, No. 5, 1993,
pp. 1095-1103. doi:10.1109/50.233273
[4] ITU Rec. G.983.4, “A Broadband Optical Access System
with Increased Service Capability Using Dynamic Band-
Width Assignment,” Geneva, Switzerland, 2001.
[5] J. Angelopoulos, H. Leligou, T. Argyriou and S. Zontos,
“Efficient Transport of Packets with QoS in An
FSAN-Aligned GPON,” IEEE Communications Maga-
zine, Vol. 42, No. 2, 2004, pp. 92-98.
doi:10.1109/MCOM.2003.1267106
[6] G. Kramer, B. Mukherjee and G. Pesavento, “IPACT: A
Dynamic Protocol for An Ethernet PON,” IEEE Commu-
nications Magazine, Vol. 40, No. 2, 2002, pp. 74-80.
doi:10.1109/35.983911
[7] M. Ma, Y. Zhu and T. Cheng, “A Bandwidth Guaranteed
Polling MAC Protocol for Ethernet Passive Optical Net-
works,” IEEE INFOCOM, Vol. 1, No. 30, 2003, pp.
22-31.
[8] Y. Zhu, M. Ma and T. Cheng, “A Novel Multiple Access
Scheme for Ethernet Passive Optical Networks,” IEEE
GLOBECOM, Vol. 22, No. 1, 2003, pp. 2649-2653.
[9] S. Choi and J. Huh, “Dynamic Bandwidth Allocation
Algorithm for Multimedia Services Over Ethernet
PONs,” IEEE INFOCOM, Vol. 1, No. 30, 2003, pp.
22-31.
[10] C. Assi, Y. Ye and S. Dixit, “Support of QoS in
IP-based”
[11] Ethernet PON, IEEE GLOBECOM, Vol. 7, No. 1, 2003,
pp. 3737-3741. doi:10.1080/028418501127346846
[12] J. Xie, S. Jiang and Y. Jiang, “A Dynamic Bandwidth
Allocation Scheme for Differentiated Services in
EPONs,” IEEE Communications Magazine, Vol. 42, No.
8, 2004, pp. 32-39. doi:10.1109/MCOM.2004.1321385
[13] B. Chen, J. Chen and S. He, “Efficient and Fine Schedul-
ing Algorithm for Bandwidth Allocation in Ethernet Pas-
sive Optical Networks,” IEEE Journal of Selected Topics
in Quanium Electronicsxxcta Radiologica, Vol. 12, No. 4,
2006, pp. 653-660. doi:10.1109/JSTQE.2006.876607
[14] H. Leligou, C. Linardakis, K. Kanonakis, J. Angelopoulos,
and T. Orphanoudadkis, “Efficient Medium Arbitration of
FSAN-Compliant GPONs,” Journal of Communication
Systems, Vol. 19, No. 5, 2006, pp. 603-607.
doi:10.1002/dac.761
[15] C. Su-il and P. Jaehyung, “SLA-Aware Dynamic Band-
Width Allocation for QoS in EPONs,” IEEE/OSA Journal
of Optical Communications and Networking, Vol. 2, No.
9, 2010, pp. 773-781.doi:10.1364/JOCN.2.00077