WDM based passive optical network (PON) upgrades current TDM based PON at the architecture, protocol and
dynamic bandwidth allocation algorithms to provide higher bandwidth in the access networks. Various Dynamic
Wavelength and Bandwidth Allocation algorithms for WDM-PON have been studied. These DWBA algorithms exploit
both inter-channel and intra-channel statistical multiplexing in order to achieve better performance, especially when the
load on various channels is not symmetric. However, these algorithms let all ONUs share all wavelengths equally, and
decouple bandwidth allocation from the wavelength assignment, which may cause bandwidth fragmentation across
different wavelengths, and these algorithms further strictly limit the ONUs only to use one wavelength per allocation
cycle, hence, leading to the underutilized network performance. To overcome the above limitation, we propose an
enhanced dynamic wavelength and bandwidth allocation (EDBA) algorithm, which integrates wavelength assignment
with bandwidth allocation process. We use extensive simulation to compare the performance of EDBA to another
DWBA algorithm in 3.
We proposed novel hybrid FSO/RF architecture1 to provide broadband wireless access to end users. To provide quality
of service (QoS) bounds for different types of traffic(voice, video and data) we proposed some fair queuing algorithms2,3
,but because of the hybrid wired and wireless links there can be certain times allocated to a host when that host is unable
to transmit data because of wireless link errors. These wireless link errors are location dependent and bursty. The
channel errors can occur from multi-path fading, shadow fading or interference from another device. In this paper we
proposed a novel fair queuing algorithm to provide end to end QoS bounds to the end users for the proposed architecture
.The algorithm provide QoS bounds for Ethernet traffic in the wired domain as well as in wireless domain with
compensation for wireless link errors. Scheduler maps priorities and weights for QoS of the Ethernet traffic into wireless
MAC. By supporting existing Ethernet traffic QoS parameters 4-7, scheduler avoids the need to redefine QoS parameters
for wireless channel. By simulations and analysis we proved that the algorithm guarantees (1) delay and throughput for
error-free flows, (2) short term fairness among error-free flows, (3) long term fairness among errored and error-free
flows,(4) graceful degradation for leading flows and graceful compensation for lagging flows. Each connection QoS is
guaranteed by calculating bounds on delay and reserving the Bandwidth (BW).
Access to the requested content is limited to institutions that have purchased or subscribe to SPIE eBooks.
You are receiving this notice because your organization may not have SPIE eBooks access.*
*Shibboleth/Open Athens users─please
sign in
to access your institution's subscriptions.
To obtain this item, you may purchase the complete book in print or electronic format on
SPIE.org.
INSTITUTIONAL Select your institution to access the SPIE Digital Library.
PERSONAL Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.