Packet VoIP Aggregation: A Mechanism to improve the Performance of VoIP in Wireless Mesh Networks (WMNs) (original) (raw)
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Increasing Supported VoIP Flows in WMNs through Link-Based Aggregation
2nd IFIP International Symposium on Wireless Communications and Information Technology in Developing Countries, 2008
As Voice over IP (VoIP) becomes a reality, service providers will be able to offer the service to remote and over populated areas that currently are not or are only partially reached by available Public Switched Telephone Network (PSTN). The combination of wireless mesh networks (WMNs) with VoIP is an attractive solution for enterprise infrastructures; presenting availability and reduced cost for both consumers and service providers. The large number of clients in WMNs leads to increased number of concurrent flows. However, only a handful of these flows reaches their destination while still within the quality of service (QoS) bound for VoIP. This performance degradation can be attributed to protocol overhead, packet collision and interferences. This paper introduces VoIP over WMNs and uses a link based packet aggregation scheme to improve VoIP performance in IEEE 802.11 based WMNs operating under distributed coordinate function (DCF). Simulation results show that the proposed aggregation scheme increases the number of supported flow while also reducing endto- end delay, jitter, and packet loss of VoIP in WMNs.
International Journal on Recent and Innovation Trends in Computing and Communication
In 802.11 Wireless Mesh Network (WMN), bandwidth will be wasted much for transferring VoIP flows since each voice frame must contain relatively large amount of protocol data. “Packet Aggregation” mechanism can be applied to merge the voice data of multiple VoIP flows into one frame for transmission. It reduces the waste on bandwidth and increases the maximum number of successful VoIP calls. In addition, the mechanism “MCF controlled channel access” (MCCA) defined in 802.11 standard can be used to obtain better QoS than adopting default EDCA mechanism. In MCCA, mesh stations which wants to transfer VoIP flows can reserve time intervals of the medium for transmission and this reservation will be advertised to their neighbors. It is why MCCA causes less medium contentions than EDCA. In this paper, a mechanism to transfer VoIP flows in IEEE 802.11 WMN by MCCA with packet aggregation scheme is proposed. The effectiveness of the proposed mechanism is shown by simulation results. In additi...
Link-Based VoIP Aggregation in Mesh Networks
2nd International Conference on New Technologies, Mobility and Security, 2008
Voice over IP (VoIP) over Wireless Mesh Network (WMNs) has become a topic of great interest in both enterprise and research arena. The IEEE 802.11 standard is the most popular Wireless LAN standard for extending the access point (AP) based network. However, it does not provide guaranteed quality for real-time applications such as VoIP. Besides, with the large number of injected flows in WMNs, only a handful of these packets can be supported due to protocol overhead, packet collision and Interferences. In this paper, a link-based aggregation is proposed and its performance improvement is compared with those of fixed aggregation and performance under standard access network. Simulation results show that the proposed aggregation scheme increases the number of supported flow while also reducing end-to-end delay, jitter, and packet loss of VoIP in WMNs.
A Dynamic Packet Aggregation Scheme for VoIP in Wireless Mesh Networks
2008
Abstract—Wireless mesh networks (WMNs) based on IEEE 802.11 standard is a new trend in networking combining performance, simplicity and economics suitable for backhaul deployments. However, service providers and carriers understand the cost of making large scale adoption of infant technologies. If WMNs are to compete with existing broadband networks, then the technology must evolve from low cost consumer deployment to carrier-grade structures with improved performance and robustness.
An Algorithm to Optimize Concurrent VoIP Calls Across Wireless Mesh Networks
Journal of Advances in Information Technology
This study focused on improving the performance of Voice over Internet Protocol (VoIP) over Wireless Mesh Networks (WMN) in an 802.11ac scenario simultaneously using packet compression and packet aggregation. The study employed design science research methodology and developed an algorithm that aims to increase the number of concurrent calls while reducing the impact of jitter, delay, and packet drop. The study is the first of its kind to come up with a combined packet compression and packet aggregation technique for Voice over Internet Protocol Wireless Mesh Networks (VoWMN) in an 802.11ac setting. During simulation tests carried out using ns-3, the algorithm outperformed existing schemes in terms of average delay, jitter, packet loss, and network throughput. The algorithm performed better by 1.4% over compressed packets and by 27.22% over plain VoIP packets in terms of packet loss, and obtained the highest network throughput of 0.16Mbps which was 56.25% more than compressed packets which had the next best throughput. These findings suggest that the proposed algorithm can significantly enhance the performance of VoIP over WMN in an 802.11ac scenario. However, this study did not cover aspects related to security implications when utilizing both aggregation and compression at the same time in VoIP over WMNs. Additionally, it only focused on the 802.11ac scenario. Further research could explore the effectiveness of the proposed algorithm in other scenarios and protocols, and identify the optimal settings for the algorithm. Additional research could explore the use of other techniques, such as error correction and QoS mechanisms, to improve the performance of VoIP over WMN.
Performance of VoIP in a 802.11 wireless mesh network
2006
Performance in multihop wireless networks is known to degrade with the number of hops for both TCP and UDP traffic. For VoIP, the wireless network presents additional challenges as the perceived quality is dependent on both loss and delay. We investigate several methods to improve voice quality and present experimental results from an 802.11b testbed optimized for voice delivery. Use of multiple interfaces, path diversity and aggregation are shown to provide a combined improvement of 13 times in number of calls supported in our 15 node 802.11 mesh system.
2013
Abstract-VoIP services are getting more and more popular day by day. In order to meet the users demand for such services irrespective of users location requires wide area wireless coverage.To this extent, wireless mesh networks have been considered as practical and inexpensive solution.In order to improve the performance of VoIP services, techniques like packet aggregation are done. This paper focuses on finding the effect of packet aggregation on various parameters like aggregation delay, end to end delay and MOS etc. Results obtained through simulations done on Qualnet Simulator concludes that packet aggregation is justified upto a certain extent only as after that most of the users get dissatisfied.
Throughput performance of a wireless VoIP model with packet aggregation in IEEE 802.11
2006
In recent years, there has been a lot of interest in using Wireless Local Area Networks (WLAN) for voice communications with the expanded coverage of hot spots. This paper describes packet aggregation method that increases the throughput of WLAN for voice communication by decreasing the overhead of backoff at the beginning of each packet transmission. Aggregation allows AP to acquire the channel and send its packets inside a multicast packet or back-to-back. Implementation and analysis of frame aggregation show that it improves the performance of voice over IP (VoIP) operating on IEEE 802.11 considerably.
VoIP over WMN: Effect of packet aggregation
2011
Abstract-VoIP services are getting more and more popular day by day. In order to meet the users demand for such services irrespective of users location requires wide area wireless coverage .To this extent, wireless mesh networks have been considered as practical and inexpensive solution .In order to improve the performance of VoIP services, techniques like packet aggregation are done . This paper focuses on finding the effect of packet aggregation on various parameters like aggregation delay, end to end delay and MOS etc. Results obtained through simulations done on Qualnet Simulator concludes that packet aggregation is justified upto a certain extent only as after that most of the users get dissatisfied.
Evaluation of VoIP QoS Performance in Wireless Mesh Networks
Information, 2017
The main focus of this research article is the evaluation of selected voice over Internet protocol (VoIP) solutions in wireless mesh network (WMN) scenarios. While WMNs have self-healing, self-forming, and dynamic topology features, they still pose challenges for the implementation of multimedia applications such as voice in various scenarios. Therefore, various solutions to make WMN more suitable for VoIP application have been proposed in the scientific literature. In this work, we have extensively explored a set of applicable scenarios by conducting experiments by means of a network simulator. The following scenarios were selected as the most representatives for performance evaluation: first responders, flooded village, remote village, and platoon deployment. Each selected scenario has been studied under six sub-scenarios corresponding to various combinations of the IEEE 802.11g, 802.11n, 802.11s, and 802.11e standards; the G.711 and G.729 codecs; and the ad hoc on demand distance vector (AODV) and hybrid wireless mesh protocol (HWMP) routing protocols. The results in terms of quality of service (measured with the mean opinion score rating scale), supported by the analysis of delay, jitter and packet loss, show that 802.11g integration with both VoIP codecs and AODV routing protocol results in better VoIP performance as compared to most other scenarios. In case of 802.11g integration with 802.11s, VoIP performance decreases as compared to the other sub-scenarios without 802.11s. The results also show that 802.11n integration with 802.11e decreases VoIP performance in larger deployments. We conclude the paper with some recommendations in terms of combinations of those standards and protocols with a view to achieve a higher quality of service for the given scenarios.