University of Khartoum

Improving Quality of Services Performance Using Multiple Low Latency Queuing in LTE- 4G Networks

Improving Quality of Services Performance Using Multiple Low Latency Queuing in LTE- 4G Networks

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Title: Improving Quality of Services Performance Using Multiple Low Latency Queuing in LTE- 4G Networks
Author: Ahmed, Mudathir Yousif Mohamed
Abstract: As the number of LTE-4G subscribers grows rapidly, the demand for an enhanced user experience with differentiated service levels is increasingly required. LTE mobile operators offer differentiated service packages based on different user needs and applications. This makes Quality of Service (QoS) a fundamental component of the LTE network framework for satisfactory delivery of applications and services, with effective end-to-end management of network-limited resources. In this thesis a new scheduling model for quality of service management, named “Multiple Low Latency Queuing scheduling mechanism” is designed. The model structure uses two Low Latency Queues (LLQ) / Class Based Weighted Fair Queue (CB_WFQ) as two high priority queues with two separate rate limiters (policers), each for a real time application separately i.e. voice and live video. To test the scheduling model, an LTE IP network model is developed and implemented on OPNET workspace using the latest version of OPNET 18.5.1 simulator associated with the help of different network entities. The simulation model is composed of 5 LTE base stations (eNBs) located in five hexagonal cells, a total of 400 user equipment (UEs) as sources of traffic located in the LTE network topology, in addition to an IP transport network connecting the network components and destination traffic servers. Typical profiles for both real-time services (Voice, Video) and non-real time (Http and Ftp) services are created, using different network attributes offered by the OPNET tool, and three scenarios associated with 9 cases are simulated and tested. This model improves the quality of service and achieves minimum delay for real time traffic (like Live Video and Voice over LTE) and critical mission data traffic in Long Term Evolution (LTE) networks and minimizes delay of the transmitted data while waiting in the queues of the transport parts that link the components of the LTE network. In addition to that, the designed model provides a trade-off between achieving low queuing delay for the real-time traffic and preventing the starvation of lower priority queues where the FIFO traffic waits. In this manner the queuing delay for the two types of traffic is reduced and so also packets interferences and bandwidth and resources allocation problems. Results show that this model is capable of improving the performance as compared to current models and providing better quality of service in both LTE core network and IP transport network.
URI: http://khartoumspace.uofk.edu/123456789/27107


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