Abstract
Long Term Evolution (LTE), known as 4G technology, is considered the choice for Third Generation Partnership Project (3GPP) and 3GPP2 mobile operators. LTE is expected to bring an improved user experience with full mobility support. However, to cope with the increasing number of mobile data subscribers that compete for the limited radio resources, effective network Quality of Service (QoS) mechanisms are necessary. A solution is to introduce small cells by adding low-power base stations to the existing macro- eNBs (Evolved Node B). The result is a Heterogeneous Network (HetNet) with large macro-cells combined with small cells (micro-, pico- and femto-cells) to cover areas not covered by the Macro-cells. Practically, HetNet is introduced in LTE-Advanced which is an extended version of LTE with more advanced features. Introducing HetNet in LTE-A brings challenges especially in terms of physical integration, QoS support and interference management. In this research, an architecture of HetNet integration is proposed. After that, some QoS scheduling algorithms are deployed for different types of on-going applications. Then, through the use of Riverbed Modeler, their performance parameters are studied with extensive simulations. Finally, an intensive comparison is done among the algorithms followed by a detailed discussion.
Highlights
The Long-Term Evolution (LTE) technology made a very big contribution in providing a better cellular network for the people’s daily needs of connectivity, Long Term Evolution (LTE)’s homogenous cellular networks cannot match the rapid increase of traffic demand
Results of scenarios are shown using the selected statistics and their important parameters, all based on the three scheduling algorithms; Custom Queueing, Priority Queueing, and Weighted Fair Queueing
Custom Queueing and Priority Queueing behave better because they have to prioritize, and once it is HTTPs turn, they serve the queue without that much dispatching in between the queues
Summary
The Long-Term Evolution (LTE) technology made a very big contribution in providing a better cellular network for the people’s daily needs of connectivity, LTE’s homogenous cellular networks cannot match the rapid increase of traffic demand. With Hetnet, many smaller cells like Picocells, Femtocells and Relays could be deployed with the Macrocells They will be either inside them, on the cell edges or even outside the Macrocells. Doing this increases data rate, brings better coverage to the areas that are difficultly approached with the Macrocells, and reduces latency due to the high traffic on the Macrocells. Implementing Hetnet is not free of big challenges and problems, some of them are: integration of the heterogeneous network, interference between the different cells inside one single network, guaranteeing Quality of Service (QoS) to the subscribers...etc. There are many mechanisms for guaranteeing QoS, such as Admission Control, Scheduling algorithms and QoS provisioning, this research emphasizes on the QoS scheduling algorithms and studies the impact of applying different scheduling algorithms on the Hetnet
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