Journal ArticleDOI
VoIP Scheduling Algorithm for AMR Speech Codec in IEEE 802.16e/m System
TLDR
The numerical results show that the proposed algorithm can increase the maximum supportable number of voice users by 26% compared to the conventional extended real-time polling service (ertPS), and reduce the waste of uplink bandwidth considering the characteristics of AMR speech codec.Abstract:
This letter proposes an efficient uplink scheduling algorithm for voice over Internet protocol (VoIP) services with adaptive multi-rate (AMR) speech codec in IEEE 802.16e/m systems. The proposed scheduling algorithm adopts the random access scheme during silent-period to reduce the waste of uplink bandwidth considering the characteristics of AMR speech codec. The numerical results show that the proposed algorithm can increase the maximum supportable number of voice users by 26% compared to the conventional extended real-time polling service (ertPS).read more
Citations
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Journal ArticleDOI
Review: VoIP: State of art for global connectivity-A critical review
TL;DR: From the very beginning of transferring the voice data over packet switched networks, the journey of the packet based communications to modern VoIP and advancements to improve the service of the VoIP system has been summarized in this work.
Journal ArticleDOI
Performance Modeling and Stability of Semi-Persistent Scheduling with Initial Random Access in LTE
Jun-Bae Seo,Victor C. M. Leung +1 more
TL;DR: The effect of the parameter called implicit release after in the LTE standard on the system performance, which is used for silence period detection, is examined and the performance evaluation model based on Equilibrium Point Analysis is compared to simulations.
Journal ArticleDOI
Modified WRR Scheduling Algorithm for WiMAX Networks
Wail Mardini,Mai Abu Alfool +1 more
TL;DR: This study proposes a Modified Weighted Round Robin (MWRR) scheduler in order to decrease the average end-to-end delay and improve the average throughput in WiMAX networks.
Journal ArticleDOI
Smart resource allocation algorithm considering voice activity for VoIP services in mobile-WiMAX system
TL;DR: The outstanding performance of the proposed algorithm with respect to average throughput and average packet dropping probability is demonstrated through intensive numerical analysis and simulations.
Journal ArticleDOI
Performance Evaluation of the VoIP Services of the Cognitive Radio System, Based on DTMC
TL;DR: This paper considers the following three different traffic models: the cross-layer analytical model, M/G/1(m) traffic, and the IEEE 802.16e/m scheduling approach to evaluate the performance of the VoIP services of the cognitive radio system from the context of blocking probability and throughput.
References
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IEEE Standards for Local and metropolitan area networks
TL;DR: The SILS components and their relationships to applications, communications protocols, system management, and security management are described.
1 Project IEEE 802.16 Broadband Wireless Access Working Group Title IEEE 802.16m Evaluation Methodology Document (EMD) Date Submitted
TL;DR: The IEEE 802.16m-08/004 Evaluation Methodology as discussed by the authors is a revised version of the 802.15.16 evaluation methodology that was developed by the TGm in Session #54.
Journal ArticleDOI
An enhanced uplink scheduling algorithm based on voice activity for VoIP services in IEEE 802.16d/e system
TL;DR: In this letter, the system throughput and the access delay of the proposed algorithm are analyzed, and it is shown that the throughput of the algorithm is superior to that of conventional algorithms in IEEE 802.16d/e system.
Proceedings ArticleDOI
The analysis of the optimal contention period for broadband wireless access network
Sung-Min Oh,Jae-Hyun Kim +1 more
TL;DR: This paper stochastically analyzes the performance of the IEEE 802.16 MAC protocol to find the optimal size of the contention period according to the number of users, and defines the cost function using the channel throughput and delay of the system.
Journal ArticleDOI
Performance analysis of CDMA systems with integrated services
S.Z. Ozer,Symeon Papavassiliou +1 more
TL;DR: It is shown that optimum variable system parameters can be found when the system parameters and quality-of-service requirements of multimedia services are given, and optimal resource-allocation strategies to maximize the throughput of wireless systems with integrated services are developed.
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