Abstract
EPON (Ethernet Passive Optical Network) is a rising bandwidth access technology, and it could realize the comprehensive operation access including data, video, and voice, with good economic characters. IEEE 802.3ah is the industrial standard of EPON, but it doesn’t concretely regulate the uplink bandwidth allocation algorithm of EPON. Therefore, aiming at the uplink channel access of EPON, people have put forward various dynamic bandwidth allocation algorithms, but most of them belong to intensive algorithm, i.e. the distributed bandwidth allocation (DBA) algorithm runs in OLT which is the interceder to allocate the uplink transmission time slot for ONU. A new distributed dynamic bandwidth allocation algorithm (DDBA) is proposed in this article, in which ONU decides the size of transmission window based on the assistant information transmitted by OLT and self queue length. The simulation result indicates that comparing with IPACT (Interleaved Poling with Adaptive Cycle Time) (G. Kramer, 2002, P.89-107), under the high network load, DDBA could obviously improve the average end-to-end time delay and the average queue length.
Highlights
With the occurrence of VOIP, video conference, and continually increasing data operation, new requirements occur for the bandwidth of network
The access control of the uplink channel is intensive, because it still could be run in OLT, but for all ONUs distributed in PON in the scheduling process, ONUs would decide the size of the uplink transmission window themselves
The distributed dynamic bandwidth allocation algorithm (DDBA) algorithm proposed in this article needs not modify the existing EPON frame, and only transfer the window information transmitted by other ONUs to certain one ONU by the agency of OLT, and it completely accords with the multi-point control protocol (MPCP) protocol regulated by IEEE 802.3ah standard, and only needs add some new fields in the REPORT frame and the GATE frame
Summary
With the occurrence of VOIP (voice of internet phone), video conference, and continually increasing data operation, new requirements occur for the bandwidth of network. The uplink bandwidth allocation algorithm of EPON could be divided into the FBA and DBA. Because FBA allocate ONU for fixed size bandwidth (time slot) each time, so the statistical reuse could not be used among ONUs, and it could not accord with the abruptness of the network operation, and the bandwidth use rate is low. Most research works emphasize on the intensive DBA algorithm, i.e. OLT accepts the bandwidth request of ONU, and compute DBA, and allocate the uplink transmission window for ONU. New distributed scheduling algorithm is proposed, and it could fairly and effectively allocate the bandwidth In this algorithm, the access control of the uplink channel is intensive, because it still could be run in OLT, but for all ONUs distributed in PON in the scheduling process, ONUs would decide the size of the uplink transmission window themselves
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
