Abstract
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.
Highlights
Wireless mesh networks (WMNs), which are defined in standards such as IEEE 802.11s forWi-Fi [1], IEEE 802.15.4 for Bluetooth [2] and IEEE 802.16j for WiMAX [3], are suitable platforms for many critical and non-critical services
For scenarios where the mean opinion score (MOS) values are lower as compared to other sub-scenarios, we have looked at other factors to identify possible causes of QoS degradation
In the remainder of this section, we present our research findings for each scenario separately in terms of the obtained MOS values for the voice over Internet protocol (VoIP) initiators and VoIP receivers; in the analysis summary of all scenarios, we present the delay, jitter, and packet loss analysis for the VoIP initiators and
Summary
Wireless mesh networks (WMNs), which are defined in standards such as IEEE 802.11s for. The remainder of this paper focuses on WMN applications and scenarios where VoIP could be offered as a critical service using a self-formed, self-healed, survivable and easy to setup communication network (Section 2). This is followed by the selection of a few scenarios and performing experiments using different IEEE 802.11 standards, voice codecs and protocols (Section 3).
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