Comprehensive Structure of Novel Voice Priority Queue Scheduling System Model for VoIP Over WLANs

2011 ◽  
Vol 3 (4) ◽  
pp. 50-70 ◽  
Author(s):  
Kashif Nisar ◽  
Angela Amphawan ◽  
Suhaidi B. Hassan
Keyword(s):  
Traffic Flow ◽  
Low Cost ◽  
Local Area ◽  
Priority Queue ◽  
High Rate ◽  
System Model ◽  
Scheduling System ◽  
Queue Scheduling ◽  
Voice Packets ◽  
The Voice

Voice over Internet Protocol (VoIP) has grown quickly in the world of telecommunication. Wireless Local Area Networks (WLANs) are the most performance assuring technology for wireless networks, and WLANs have facilitated high-rate voice services at low cost and good flexibility. In a voice conversation, each client works as a sender or a receiver depending on the direction of traffic flow over the network. A VoIP application requires high throughput, low packet loss, and a high fairness index over the network. The packets of VoIP streaming may experience drops because of the competition among the different kinds of traffic flow over the network. A VoIP application is also sensitive to delay and requires the voice packets to arrive on time from the sender to the receiver side without any delay over WLAN. The scheduling system model for VoIP traffic is an unresolved problem. The objectives of this paper are to identify scheduler issues. This comprehensive structure of Novel Voice Priority Queue (VPQ) scheduling system model for VoIP over WLAN discusses the essential background of the VPQ schedulers and algorithms. This paper also identifies the importance of the scheduling techniques over WLANs.

Comprehensive Structure of Novel Voice Priority Queue Scheduling System Model for VoIP over WLANs

2013 ◽  
pp. 257-278
Author(s):  
Kashif Nisar ◽  
Angela Amphawan ◽  
Suhaidi B. Hassan
Keyword(s):  
Traffic Flow ◽  
Low Cost ◽  
Local Area ◽  
Priority Queue ◽  
High Rate ◽  
System Model ◽  
Scheduling System ◽  
Queue Scheduling ◽  
Voice Packets ◽  
The Voice

Voice over Internet Protocol (VoIP) has grown quickly in the world of telecommunication. Wireless Local Area Networks (WLANs) are the most performance assuring technology for wireless networks, and WLANs have facilitated high-rate voice services at low cost and good flexibility. In a voice conversation, each client works as a sender or a receiver depending on the direction of traffic flow over the network. A VoIP application requires high throughput, low packet loss, and a high fairness index over the network. The packets of VoIP streaming may experience drops because of the competition among the different kinds of traffic flow over the network. A VoIP application is also sensitive to delay and requires the voice packets to arrive on time from the sender to the receiver side without any delay over WLAN. The scheduling system model for VoIP traffic is an unresolved problem. The objectives of this paper are to identify scheduler issues. This comprehensive structure of Novel Voice Priority Queue (VPQ) scheduling system model for VoIP over WLAN discusses the essential background of the VPQ schedulers and algorithms. This paper also identifies the importance of the scheduling techniques over WLANs.

Voice Priority Queue Scheduling System Models for VoIP over WLANs

2013 ◽  
Vol 5 (1) ◽  
pp. 36-59
Author(s):  
Kashif Nisar
Keyword(s):  
Communication Networks ◽  
Scheduling Algorithm ◽  
Priority Queue ◽  
Bandwidth Utilization ◽  
Scheduling System ◽  
Limited Bandwidth ◽  
System Models ◽  
Efficient Performance ◽  
Voice Packets ◽  
The Voice

The Voice over Internet Protocol (VoIP) is a delay sensitive traffic due to real-time applications on networks. The assessment of voice flow quality in the VoIP is an essential requirement for technical and commercial motivation. The packets of VoIP streaming may experience drops because of the competition among the different kinds of traffic flow over the network. A VoIP application is also sensitive to delay and requires the voice packets to arrive on time from the sender to the receiver side without any delay over WLAN. The scheduling system model for VoIP traffic is an unresolved problem. In this research paper, the author proposes a new Voice Priority Queue (VPQ) scheduling system models and algorithms for the VoIP over WLANs to solve scheduling issues over IP-based networks. They present new contributions, through the three stages of the VPQ. The VPQ scheduling algorithm is provided as an essential technique in the VoIP communication networks to guarantee the QoS requirements. The design of the VPQ is managed by the limited bandwidth utilization and has been proven to have an efficient performance over WLANs.

Fourth Stage of Voice Priority Queue for VoIP over WLANs

2012 ◽  
Vol 4 (2) ◽  
pp. 48-63
Author(s):  
Kashif Nisar
Keyword(s):  
Packet Scheduling ◽  
Low Cost ◽  
Local Area ◽  
Priority Queue ◽  
Network Simulator ◽  
Processor Sharing ◽  
Fourth Stage ◽  
Delay Sensitive ◽  
Voice Traffic

Voice over Internet Protocol (VoIP) is growing rapidly during this decade. VoIP is seen as a short-term and long-term transmission for voice and audio traffic and is moving on Wireless Local Area Networks (WLANs) based on IEEE 802.11 standards. Currently, packet scheduling algorithms like Weighted Fair Queuing (WFQ), was mainly designed to provide the bandwidth reservation. The Strict Priority (SP) is low-cost to maintain the delay sensitive voice traffic. Also, a number of research scheduling solutions have been proposed like General processor sharing (GPS), Deficit Round Robin (DRR), Contention-Aware Temporally fair Scheduling (CATS). Unfortunately, the current scheduling won’t be able to handle the VoIP packets properly and they have drawbacks over real-time applications. The objective of this research is to propose a Fourth Stage of Voice Priority Queue (VPQ) packet scheduling and algorithm to ensure more throughput, fairness and efficient packet scheduling for VoIP performance of queues and traffics. A new scheduler flexible which is capable of satisfying the VoIP traffic flows. Experimental topologies on NS-2 network simulator were analyzed for voice traffic.

Mobility of Mobile Station in Voice Priority Queue Scheduler for VoIPWLANs

2011 ◽  
Vol 2 (3) ◽  
pp. 28
Author(s):  
Kashif Nisar ◽  
Suhaidi Hassan
Keyword(s):  
Packet Scheduling ◽  
Low Cost ◽  
Mobile Station ◽  
Local Area ◽  
Priority Queue ◽  
Experimental Simulation ◽  
Network Simulator ◽  
Processor Sharing ◽  
Traffic Flows ◽  
Voice Traffic

Voice over Internet Protocol (VoIP) is growing rapidly during this decade. VoIP is seen as a short-term and long-trem transmission for voice and audio traffic. Meanwhile, VoIP is moving on Wireless Local Area Networks (WLANs) based on IEEE 802.11 standards. Currently, many packet scheduling algorithms like Weighted Fair Queuing (WFQ), was mainly designed to provide the bandwidth reservation. The Strict Priority (SP) is low-cost to maintain the delay sensitive voice traffic. Also, a number of research scheduling solutions have been proposed like General processor sharing (GPS), Deficit Round Robin (DRR), Contention-Aware Temporally fair Scheduling (CATS). Unfortunately, the current scheduling will not be able to handle the VoIP packets with the proper manner and they have some drawbacks over real-time applications. The objective of this research is to propose a new Voice Priority Queue (VPQ) packet scheduling and algorithm to ensure more throughput, fairness and efficient packet scheduling for VoIP performance of queues and traffics. A new scheduler flexible which is capable of satisfying the VoIP traffic flows. Experimental topologies on NS-2 network simulator were analyzed for voice traffic. Preliminary results show that this can achieve maximum and more accurate VoIP quality throughput and fairness index in mobility of mobile station. We verified and validated VPQ an extensive experimental simulation study under various traffic flows over WLANs.

Performance of VoIP in Wired-Cum-Wireless Ethernet Network

2012 ◽  
Vol 4 (4) ◽  
pp. 1-25
Author(s):  
Nurul I. Sarkar ◽  
Kashif Nisar
Keyword(s):  
System Performance ◽  
Low Cost ◽  
Local Area ◽  
Data Networks ◽  
Data Traffic ◽  
Home Office ◽  
Traffic Characteristics ◽  
Packet Arrival ◽  
Campus Networks ◽  
The Voice

The Voice over Internet Protocol (VoIP) is a rapidly growing technology that enables transport of voice over data networks such as Ethernet Local Area Networks (LANs). This growth is due to the integration of voice and data traffic over the existing network infrastructure, low cost, and improved network management offered by the technology. This paper reports on the performance of VoIP traffic characteristics in a wired-cum-wireless Ethernet LAN. The effect of increasing the number of VoIP wireless clients, different voice codec schemes, and packet arrival distributions on system performance is investigated. Through various simulation experiments under realistic network scenarios, such as Small Office Home Office (SOHO) and campus networks, this paper provides an insight into the performance of VoIP over Ethernet LANs. Simulation results show that VoIP clients and voice codec schemes have significant effect on system performance. The authors preformed OPNET-based simulations to validate their experiments.

Moxifloxacin Based Triple Therapy as Alternative to Standard Therapy in Helicobacter Pylori Eradication.

2020 ◽  
Vol 18 ◽  
Author(s):  
Mohammed Hussien Ahmed ◽  
Sherief Abd-Elsalam ◽  
Aya Mohammed Mahrous
Keyword(s):  
Helicobacter Pylori ◽  
Triple Therapy ◽  
Therapy Group ◽  
Low Cost ◽  
High Rate ◽  
Helicobacter Pylori Eradication ◽  
Treatment Regimens ◽  
Group A ◽  
H Pylori ◽  
Group B

Introduction: Helicobacter pylori eradication remains a problematic issue. We are in an urgent need for finding a treatment regimen that achieves eradication at a low cost and less side effect. Recent published results showing a high rate of resistance and with clarithromycin-based treatment regimens. The aim of the study was to compare moxifloxacin therapy and classic clarithromycin triple therapy in H. pylori eradication. Methods: This was a pilot study that enrolled 60 patients with helicobacter pylori associated gastritis. Diagnosis was done by assessment of H. pylori Ag in the stool. The patients were randomly assigned to receive either moxifloxacin based therapy (Group A), or clarithromycin based therapy (Group B) for two weeks. We stopped the treatment for another two weeks then reevaluation for cure was done. Results: 90 % of patients had negative H. pylori Ag in the stool after 2 weeks of stoppage of the treatment in group A versus 66.7 % in Group B. None of the patients in both groups had major side effects. Conclusion: Moxifloxacin-based therapy showed higher eradication power and less resistance when compared to clarithromycin triple therapy.

Wastewater treatment high rate algal ponds (WWT HRAP) for low-cost biofuel production

2015 ◽  
Vol 184 ◽  
pp. 202-214 ◽  
Author(s):  
Abbas Mehrabadi ◽  
Rupert Craggs ◽  
Mohammed M. Farid
Keyword(s):  
Wastewater Treatment ◽  
Low Cost ◽  
Biofuel Production ◽  
High Rate ◽  
High Rate Algal Ponds

The influence of straw quality and level of concentrate in a completely mixed diet on intake and growth rate in steers

1988 ◽  
Vol 1988 ◽  
pp. 58-58
Author(s):  
M. Kay ◽  
G. W. Reid ◽  
E. R. Orskov
Keyword(s):  
Winter Wheat ◽  
Previous Experiment ◽  
Low Cost ◽  
Spring Barley ◽  
High Rate ◽  
Finishing Cattle ◽  
Complete Diet ◽  
Beet Pulp ◽  
Straw Quality ◽  
Ad Libitum

Results from a previous experiment with growing steers showed that straw from varieties of winter and spring barley or winter wheat supported different intakes and rates of gain. It was possible to identify those cereal straws most suitable for inclusion in low cost diets for beef cattle. The object of this work was to assess whether complete diets containing a minimum of 35% “good” straw could sustain a high rate of gain in finishing cattle. The trial used 45 Hereford cross steers that weighed 360 kg at the start. There were three types of straw examined; straw from the spring barley variety Corgi, untreated (UC) and ammonia treated (AC) together with ammonia treated winter wheat (AW) cv. Longbow;. Each straw type was included in a complete diet containing either 0.35 (L), 0.45 (M) or 0.55 (H) straw. Ammonia treatment was carried out in an oven with 0.03 anhydrous ammonia for 24 hours. The straw was processed through a tub grinder and the chopped material was transferred to a mixer wagon for diet preparation. All the diets contained fishmeal and urea and equal proportions of rolled barley and molassed sugar beet pulp substituted for the straw. The complete diets were offered ad libitum and the steers were weighed fortnightly until they were estimated to provide carcasses in MLC fat class 4L. Digestibility data for each diet was derived in a subsidary trial using cattle fed ad libitum. The digestibility coefficients for D11 were 0.67 UC; 0.68 AW; 0.69 AC and 0.66 H; 0.68 M; 0.70 L (S.E.D. ± 0.66).

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