Abstract
Globally, there is a significant rise in the number of connected devices. Every device has an access to wide variety of telecom services among which voice, video and best effort (BE) contribute significantly. There is a noticeable growing trend towards upstream BE traffic besides real time e-services that demand high quality of service (QoS). Converged next-generation fiber-wireless (FiWi) access networks composed of next-generation passive optical network (XG-PON) and 802.11n based wireless local area network (WLAN) has emerged as a suitable choice to provide high quality and affordable e-services to plenty of subscribers as they possess both high bandwidth and flexibility. In this paper, we study the performance of the integrated network architecture which combines XG-PON and enhanced distributed channel access (EDCA) under real time bursty traffic derived from the current global IP traffic distribution. The joint tuning of various crucial parameters of both XG-PON and EDCA with incorporation of an efficient deficit dynamic bandwidth algorithm (DBA) at optical line terminal (OLT) is done by exhaustive simulations in network simulator-3 (NS-3). Through intensive simulations and tuning, we are able to achieve a end-to-end delay performance of <; 150 ms for voice, <; 500 ms for video and a few seconds for BE upto full capacity. Also, a packet loss ratio (PLR) of <; 3% and <; 6% is achieved for voice and BE respectively upto full load. For voice PLR is <; 1% upto 60% total offered load. Further, it is observed that the fine tuning of key parameters has also resulted in increased bandwidth for dominant BE services. Therefore, this optimized network architecture is 20% more fair to BE services as compared to the conventional integrated FiWi architectures.
Highlights
The convergence of the optical and wireless technologies can be used to realize FiWi architecture systems
The extensions include (a) Incorporating realistic traffic models to model voice, video and best effort (BE) traffic each with their particular specifications as per the incoming global IP traffic and (b) tune the values of parameters belonging to enhanced distributed channel access (EDCA) and XG-PON so that e-services can be served to a large number of potential subscribers within tolerable delay and packet loss ratio (PLR) limit
The deficit dynamic bandwidth algorithm (DBA) is implemented in XG-PON to provide prioritized and fair quality of service (QoS) which is demonstrated in terms of latency, PLR, throughput and fairness index in integrated network
Summary
The convergence of the optical and wireless technologies can be used to realize FiWi architecture systems. The extensions include (a) Incorporating realistic traffic models to model voice, video and BE traffic each with their particular specifications as per the incoming global IP traffic and (b) tune the values of parameters belonging to EDCA and XG-PON so that e-services can be served to a large number of potential subscribers within tolerable delay and PLR limit This is quite a challenging task since there is a need to ensure that considerable capacity of XG-PON is effectively utilised by Wi-Fi applications and simultaneously, the resource allocation mechanism is implemented in XG-PON according to the incoming global IP traffic pattern in order to cater to the bandwidth requirement of Wi-Fi clients [17].
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