Citation
Najim, Alaa Omer
(2018)
Channel-aware downlink scheduling for quality of service in long term evolution network.
Masters thesis, Universiti Putra Malaysia.
Abstract
Long Term Evolution (LTE) is a recently evolving technology proposed by the
Third Generation Partnership Project to provide a smooth migration toward the
Fourth Generation of cellular networks. Radio Resource Management (RRM) is
one of the core modules in LTE network architecture which includes functions to
manage and handle involved system users who are communicating with their
resources sites. In this thesis, Packet Scheduling is defined as one of the main
RRM functions, and it is responsible for the intelligent selections of users and
transmissions of their packets such that radio resources are efficiently utilized,
and user’s Quality of Service (QoS) requirements are satisfied. The emphasis of
this research is on the radio resource scheduling of LTE downlink. For flows
with different volumes, delay has been defined as a major challenging issue that
restricts the delivered network performance to subscribed users.
In this thesis, a Delay-oriented Resource Allocation (DoRA) scheduler is proposed
to provide an efficient allocation of wireless resources across users of
different traffic volumes to minimize delay. Initially, a range of constraints was
defined based on a recent algorithm from the literature, namely Delay Based
Weighted Proportional Fair (DBWPF). These constraints comprise the use of
an inefficient method to determine delay by the buffer size. In the proposed
algorithm we, utilize Head of Line delay with channel-related parameters such
as user data rate in addition to several pre-defined QoS tunable parameters
to formulate a rule that prioritizes different user flows assigned with channel
resources in order to improve delay.
The proposed algorithm using system-level simulation experiments with performance comparison with DBWPF in terms of end-to-end delay, fairness, system
throughput, Packet Loss Ratio (PLR), and spectral efficiency was evaluated. The
output results indicate that the proposed DoRA scheduling algorithm outperforms
DBWPF in providing a minimum level of end-to-end delay.
Download File
Additional Metadata
Actions (login required)
 |
View Item |
