Performance problems of VoIP in 802.11 wireless mesh networks &amp; their solutions

Kekre, H. B.; Bharadi, Vinayak Ashok; Bansode, Rajesh; Kaul, Vikas

doi:10.1145/1980022.1980214

Cited by 2 publications

(6 citation statements)

References 3 publications

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“…Kekre, H. B. et al [26] combined packet multiplexing and multicasting (M-M). The primary idea of M-M method is to compress the RTP/UDP/IP header of the VoIP packet and attach a mini-header with a unique ID to distinguish the multiplexed packets at the de-multiplexer.…”

Section: Non-adaptive Multiplexing Methodsmentioning

confidence: 99%

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Multiplexing VoIP Packets over Wireless Mesh Networks: A Survey

2016

KSII TIIS

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Wireless mesh networks (WMNs) have been increasingly applied in private and public networks during the last decade. In a different context, voice over IP (VoIP) has emerged as a new technology for making voice calls around the world over IP networks and is replacing traditional telecommunication systems. The popularity of the two technologies motivated the deployment of VoIP over WMNs. However, VoIP over WMNs suffers from inefficient bandwidth utilization because of two reasons: i) attaching 40-byte RTP/UDP/IP header to a small VoIP payload (e.g., 10 bytes) and ii) 841 µs delay overhead of each packet in WMNs. Among several solutions, VoIP packet multiplexing is the most prominent one. This technique combines several VoIP packets in one header. In this study, we will survey all the VoIP multiplexing methods over WMNs. This study provides a clear understanding of the VoIP bandwidth utilization problem over WMNs, discusses the general approaches in which packet multiplexing methods could be performed, provides a detailed study of present multiplexing techniques, shows the aspects that hinder the VoIP multiplexing methods, discusses the factors affected by VoIP multiplexing schemes, shows the merits and demerits of different multiplexing approaches, provides guidelines for designing a new improved multiplexing technique, and provides directions for future research. This study contributes by providing guidance for designing a suitable and robust method to multiplex VoIP packets over WMNs.

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Section: Non-adaptive Multiplexing Methodsmentioning

confidence: 99%

“…Meanwhile, the transmission time of a 20-byte G.729 payload in the 11 Mb/s network is only 20*8/11=14 µs. Therefore, the voice data consume less than 2% of the transmission time [20], [21], [25], [26], [27]. Accordingly, a large header overhead is added to each packet, thereby wasting bandwidth resources.…”

Section: Voip Over Wmnsmentioning

confidence: 99%

Multiplexing VoIP Packets over Wireless Mesh Networks: A Survey

2016

KSII TIIS

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“…Kekre et al [10] focused on reviewing VoIP operations over IEEE802.11 WLANs. The authors focused on multi-hop scenarios.…”

Section: Related Workmentioning

confidence: 99%

“…These proposals can be grouped according to the TCP/IP layer they are applied. The proposals in [3], [5], [9], [10], [11], [16], [18], [23] work at the network layer. Proposals in [13], [17], [24], [26], on the other hand, work at the data link layer.…”

Section: Introductionmentioning

confidence: 99%

“…Proposals in [13], [17], [24], [26], on the other hand, work at the data link layer. The network layer aggregation proposals can be also classified as multi-hop ( [3], [5], [9], [10], [11], [16], [18]) or single-hop ( [23]). When considering multi-hop aggregation algorithms, they can be further divided according to the point of aggregation in the network, which can be end-to-end ( [5], [10], [11], [18]) or hop-by-hop ( [3], [5], [9], [11], [16]).…”

Section: Introductionmentioning

confidence: 99%

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A Packet Aggregation Mechanism For Real Time Applications Over Wireless Networks

Filho

Caetano

Bordim

2012

IJNC

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This work presents a packet aggregation technique, named Holding Time Aggregation -HTA. HTA is tailored for real time applications whose data is carried over wireless network environments. At the center of HTA lies an elaborated packet holding time estimation, which makes HTA to be highly adaptable to the diverse link conditions of a wireless setting. Contrary to other proposals that consider fixed packet retention time, the proposed HTA uses an adaptable packet retention time to allow relay nodes to explore aggregation opportunities on a multi-hop path. The proposed mechanism was evaluated and compared to another prominent packet aggregation scheme. Simulation results have shown that the proposed mechanism is capable to keep jitter and total delay within application limits. Furthermore, HTA has shown to allow for substantial reduction on the number of packet transmissions as well as on the overall packet overhead. Savings in terms of packet transmissions reached nearly 80% in the evaluated scenarios. These results have shown that the proposed scheme is able to cope with varying network link capacity and strict application timing requirements. The empirical results have shown to be consistent with the analytical results.

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Performance problems of VoIP in 802.11 wireless mesh networks & their solutions

Cited by 2 publications

References 3 publications

Multiplexing VoIP Packets over Wireless Mesh Networks: A Survey

Multiplexing VoIP Packets over Wireless Mesh Networks: A Survey

A Packet Aggregation Mechanism For Real Time Applications Over Wireless Networks

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