DocumentCode :
6007
Title :
Comprehensive performance assessment of bipartition upstream bandwidth assignment schemes in GPON
Author :
Jhong-Yue Lee ; I-Shyan Hwang ; Nikoukar, AliAkbar ; Liem, Andrew Tanny
Author_Institution :
Dept. of Comput. Sci. & Eng., Yuan-Ze Univ., Chungli, Taiwan
Volume :
5
Issue :
11
fYear :
2013
fDate :
Nov. 2013
Firstpage :
1285
Lastpage :
1295
Abstract :
With the emerging diversified services, the gigabit-capable passive optical network (GPON) has emerged as one of the most important technologies to support the next-generation broadband access networks. Dynamic bandwidth assignment (DBA) avoids transmission collision in the upstream direction and improves the efficiency of the PON upstream bandwidth by dynamically adjusting the bandwidth among the optical network units (ONUs) in response to the ONU burst traffic requirement. Instead of using GATE and REPORT control messages in Ethernet PON DBA, the buffer REPORT/GRANT message is embedded into a GPON encapsulation mode (GEM)/GPON transmission convergence (GTC) frame, and all ONUs are essentially polled simultaneously within a GEM/GTC frame in GPON DBA. This paper proposes a bipartition DBA (BI-DBA) mechanism in GPON that divides the transmission cycle time into two groups and adjusts the bandwidth dynamically. Two cases are considered: in the first case, there is a first group for high priorities T-CONT 1 and T-CONT 2 and a second group for low priorities T-CONT 3 and T-CONT 4, called class based scheduling (CBDBA). In the second case, the first and the second group are created according to the number of ONUs, called group based scheduling (GBDBA). Moreover, the T-CONT 2 traffic has a prediction mechanism and recycles the remaining unused bandwidth for the low-priority T-CONTs. The GBDBA has better system performances in terms of the average bandwidth utilization, packet latency, and drop probability; on the other hand, the CBDBA has better packet delay performance when the proportion of T-CONT 1 traffic is higher and has better fairness performance.
Keywords :
bandwidth allocation; next generation networks; optical fibre LAN; passive optical networks; telecommunication traffic; CBDBA; GBDBA; GEM-GTC frame; GPON DBA; GPON encapsulation mode-GPON transmission convergence frame; ONU burst traffic requirement; PON upstream bandwidth; T-CONT 1 traffic; T-CONT 2 traffic; T-CONT 3; T-CONT 4; bipartition DBA mechanism; bipartition upstream bandwidth assignment schemes; buffer REPORT-GRANT message; class based scheduling; drop probability; dynamic bandwidth assignment; gigabit-capable passive optical network; group based scheduling; next-generation broadband access networks; optical network units; packet delay performance; packet latency; performance assessment; transmission cycle time; upstream direction; BI-DBA; CBDBA; GBDBA; GPON; System performance;
fLanguage :
English
Journal_Title :
Optical Communications and Networking, IEEE/OSA Journal of
Publisher :
ieee
ISSN :
1943-0620
Type :
jour
DOI :
10.1364/JOCN.5.001285
Filename :
6678153
Link To Document :
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