16 research outputs found
Performance Evaluation of Round Robin and Proportional Fair Scheduling Algorithms for Constant Bit Rate Traffic in LTE
Scheduling is a key Radio Resource Management (RRM) mechanism for realizing Quality of Service (QoS)
requirements and optimizing system performance of Long Term
Evolution (LTE) network. Scheduling is the process of
dynamically allocating physical resources to User Equipments (UEs) based on scheduling algorithms implemented at the LTE base station. Various algorithms have been proposed by network designers/researchers as the implementation of scheduling algorithm is an open issue in LTE standard. The choice of scheduling algorithm critically impacts resource utilization and the overall performance of LTE network. This paper makes an attempt to study and compare the performance of Round Robin (RR) and Proportional Fair (PF) scheduling algorithms for Constant Bit Rate (CBR) traffic scenario. Performance metrics
considered for simulation studies are throughput, delay and
jitter
Performance Study of Proportional Fair Scheduling Algorithm with Transmit Diversity Multi-Antenna Technique for Lte Network
Long Term Evolution (LTE) access network is based on Orthogonal Frequency Division Multiple Access (OFDMA) which provides multi user diversity gain to enhance the system throughput. However, fading of a radio channel causes inter channel interference and reduces overall system throughput. This deteriorating effect of wireless channel fading is higher for mobile users which can be reduced by channel aware scheduling algorithm and transmit diversity multi-antenna technique. Hence in this paper, an attempt has been made to evaluate the effect of mobility on the performance of Proportional Fair (PF) channel aware scheduling algorithm in conjunction with transmit diversity multi-antenna technique by considering throughput, delay and jitter as performance metrics.
Performance Evaluation of Multi Antenna Techniques in LTE
High data rate requirements of the Long Term Evolution - Advanced (LTE-A) systems can be achieved by adopting advanced Multiple Input Multiple Output (MIMO) antenna techniques on both uplink and downlink. The LTE air-interface supports multiple-antenna transmit arrays and different modes of multiple antenna transmissions. In this paper, performance of different MIMO techniques is evaluated using QualNet network simulator. The MIMO techniques considered for performance evaluation are SingleInput/Multiple-Output (SIMO), Open Loop Spatial Multiplexing (OLSM) and Space-Frequency Block
Coding (SFBC). The performance metrics considered are throughput, delay and jitter
Performance Study of Round Robin and Proportional Fair Scheduling Algorithms by Emulation for Video Traffic in LTE Networks
Video communication over mobile broadband is gaining
popularity due to the increased demand for applications such as Video on Demand (VoD), IPTV, video conferencing etc. In order to support these video applications over mobile broadband, efficient video streaming within the limited bandwidth environment is essential. Further, Long Term Evolution (LTE) network incorporates advanced Radio
Resource Management (RRM) mechanism such as scheduling
to realize efficient video streaming over limited bandwidth arena. Scheduling does the task of dividing and allocating radio resources in order to maximize system throughput and enhance Quality of Experience (QoE) of the end user. Hence, in this paper an attempt has been made to evaluate the performance of Round Robin (RR) and Proportional Fair (PF) scheduling algorithms using EXata network emulator for real video traffic generated by Video LAN (VLC) media player. Packet Delivery Ratio (PDR) and throughput are considered as performance metrics for the emulation studies
Impact of Adaptive Modulation and Coding Schemes on Bit Error Rate for System Performance in the Uplink LTE System
Long Term Evolution (LTE) is a cellular network technology aims to render enriched data services to users at lower latency and higher (multi-megabit) throughput. The higher system throughput with more reliable transmission is achieved by the support of Adaptive Modulation and Coding (AMC) schemes, scheduling algorithms, multi-antenna techniques etc. The AMC schemes substantially increases the system throughput by reducing the Bit Error Rates (BER) and by adjusting the transmission parameters based on the link quality. The scheduling algorithms also enhance the throughput of individual users, as well as the cell throughput by allocating the resources among the active users. Hence in this paper, an attempt has been made to study and evaluate the effects of AMC schemes such as QPSK, 16-QAM and 64-QAM on uplink LTE system performance for Proportional Fair (PF) and Round Robin (RR) scheduling algorithms using QualNet 7.1 network simulator. The performance metrics considered for the simulation studies are BER, cell throughput, average delay and average jitte
Effect of Adaptive Modulation and Coding Schemes on Scheduling Algorithms for LTE Downlink
Long Term Evolution (LTE) network uses Radio
Resource Management (RRM) mechanisms such as
Scheduling and Adaptive Modulation and Coding
(AMC) for realizing Quality of Service (QoS)
requirements and optimizing system performance.
Scheduling is the process of dynamically allocating
physical resources to User Equipments (UEs) based on
scheduling algorithms implemented at MAC sublayer of
the LTE base station. Whereas AMC is Link Adaptation
functionality of LTE Physical layer to enhance higher
system performance. AMC scheme adopted in LTE
Downlink depends on the channel quality Index (CQI)
feedback from User Equipments. Hence in this paper,
an attempt has been made to study and compare the
performance of Blind Equal Throughput (BET),
Maximum Throughput (MT) and Proportional Fair
(PF) scheduling algorithms for Downlink connections
with AMC (64 QAM, 16 QAM and QPSK regions) for
Constant Bit Rate (CBR) traffic scenario. Performance
metrics considered for simulation studies are
throughput, delay, jitter and fairness. From the
simulation results it is evident that the throughput,
delay, jitter and fairness performances of the
considered scheduling algorithms are better in 64QAM
region. Also, MT scheduling algorithm achieves better
throughput and BET scheduling algorithm achieves
better fairness
he Study and Analysis of Effect of Multi-Antenna Techniques on LTE network with Different Bandwidth Configurations in the Downlink
Long Term Evolution (LTE) system adapts advanced Multiple Input Multiple Output (MIMO) antenna techniques on both uplink and downlink to achieve high peak data rates and higher system throughput. This enables LTE to support multimedia applications beyond web browsing and voice, which demands higher bandwidth configurations. LTE employs Orthogonal Frequency Division Multiple Access (OFDMA) in downlink to support spectrum flexibility in order to use upto 20MHz system bandwidth to improve the system throughput and robustness. Therefore the combined study of multi-antenna techniques and spectrum flexibility usage on the performance of LTE system becomes vital. Hence in this paper, an attempt has been made to evaluate the performance of different multi-antenna techniques with various system bandwidth configurations from 1.4MHz to 20MHz using QualNet 5.2 network simulator. The multi-antenna techniques considered for performance evaluation are Single Input Single Output (SISO), Multiple Input Single Output (MISO) and Multiple Input Multiple Output (MIMO). The performance metrics such as aggregate bytes received, average throughput, average delay and average jitter are considered for simulation study
The Study and Analysis of Effect of Multi- Antenna Techniques on LTE network with Different Bandwidth Configurations in the Downlink
Long Term Evolution (LTE) system adapts advanced Multiple Input Multiple Output (MIMO) antenna
techniques on both uplink and downlink to achieve high peak data rates and higher system throughput. This
enables LTE to support multimedia applications beyond web browsing and voice, which demands higher
bandwidth configurations. LTE employs Orthogonal Frequency Division Multiple Access (OFDMA) in downlink
to support spectrum flexibility in order to use upto 20MHz system bandwidth to improve the system throughput
and robustness. Therefore the combined study of multi-antenna techniques and spectrum flexibility usage on the
performance of LTE system becomes vital. Hence in this paper, an attempt has been made to evaluate the
performance of different multi-antenna techniques with various system bandwidth configurations from 1.4MHz
to 20MHz using QualNet 5.2 network simulator. The multi-antenna techniques considered for performance
evaluation are Single Input Single Output (SISO), Multiple Input Single Output (MISO) and Multiple Input
Multiple Output (MIMO). The performance metrics such as aggregate bytes received, average throughput,
average delay and average jitter are considered for simulation study
Performance Evaluation of Mobility Effects on Various Transmission Modes in the LTE Network
Long Term Evolution (LTE) system uses Internet Protocol (IP) based network architecture and advanced multi-antenna techniques to provide higher system throughput and high user mobility, intern to support low delay multimedia services such as voice, real time video connections and effective internet connectivity without any disruption. Hence in this paper, an attempt has been made to analyze the impact of mobility on the Quality of Service (QoS) parameters such as average throughput, average jitter and average delay of a LTE network for various transmission modes such as Serial-Input Serial-Output (SISO), Transmit Diversity, Receive Diversity and Open Loop Spatial Multiplexing (OLSM)
Performance Study of Proactive, Reactive and Hybrid Routing Protocols for MANET in Multiple CBR Scenario
Mobile Ad-Hoc Network (MANET) comprises of numerous ubiquitous mobile computing devices called nodes which form distributed network and support dynamic topology without any centralized infrastructure like base station. In such distributed network, the communication between the nodes relies on multihop technique. Since, the nodes in a MANET do not have a priori knowledge of the network topology, it discovers the route through broadcasting and listening to announcement from the neighbours. As the process continues, each node finds one or more routes to all other nodes. Hence, the end-to-end communication in a MANET does not rely on any underlying static network infrastructure but implicates routing via several intermediate nodes. The routing of data in the network depends on the protocol which determines the most appropriate path to forward packets to the intended destination. The routing protocols are classified into proactive, reactive and hybrid. - See more at: http://ijcst.com/vol-6-1/#sthash.WqU9W1rP.4EQeRlbm.dpu