CBR packetized voice transmission in IEEE802.11 networks

Ziouva, E.; Antonakopoulos, Theodore

doi:10.1109/iscc.2001.935404

Cited by 10 publications

(6 citation statements)

References 4 publications

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“…Supporting packet voice over IEEE 802.11 has been investigated for both the distributed and the point coordination functions (DCF and PCF, respectively); however, the performance is very poor [16,17]. The DCF was not designed to support QoS because it uses a contention-based approach with randomized binary exponential back-off.…”

Section: Related Workmentioning

confidence: 99%

An opportunistic cross‐layer architecture for voice in multi‐hop wireless LANs

Obeidat

Syrotiuk

2008

Int J Communication

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SUMMARYWe propose an opportunistic cross-layer architecture for adaptive support of Voice over IP in multi-hop wireless LANs. As opposed to providing high call quality, we target emergencies where it is important to communicate, even if at low quality, no matter the harshness of the network conditions.With the importance of delay on voice quality in mind, we select adaptation parameters that control the ratio of real-time traffic load to available bandwidth. This is achieved in two ways: minimizing the load and maximizing the bandwidth. The PHY/MAC interaction improves the use of the spectral resources by opportunistically exploiting rate-control and packet bursts, while the MAC/application interaction controls the demand per source through voice compression. The objective is to maximize the number of calls admitted that satisfy the end-to-end delay budget.The performance of the protocol is studied extensively in the ns-2 network simulator. Results indicate that call quality degrades as load increases and overlonger paths, and a larger packet size improves performance. For long paths having low-quality channels, forward error correction, header compression, and relaxing the delay budget of the system are required to maintain call admission and quality. The proposed adaptive protocol achieves high performance improvements over the traditional, non-adaptive approach.

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Section: Related Workmentioning

confidence: 99%

An opportunistic cross‐layer architecture for voice in multi‐hop wireless LANs

Obeidat

Syrotiuk

2008

Int J Communication

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“…Furthermore, the industrystandard IEEE 802.11 MAC protocol [8] includes a polling scheme for real-time communications. This led to a number of papers on voice over 802.11 MAC schemes [21]- [31]. Most of these papers use simulations to determine how to support telephony on the 802.11 polling mode.…”

Section: Related Workmentioning

confidence: 99%

Analysis of a polling system for telephony traffic with application to wireless LANs

Logothetis

Veeraraghavan

2006

IEEE Trans. Wireless Commun.

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Abstract-Recently, polling has been included as a resource sharing mechanism in the Medium Access Control (MAC) protocol of several communication systems, such as the IEEE 802.11 wireless local area network, primarily to support realtime traffic. Furthermore, to allow these communication systems to support multimedia traffic, the polling scheme often coexists with other MAC schemes such as random access. Motivated by these systems, we develop a model for a polling system with vacations, where the vacations represent the time periods in which the resource sharing mechanism used is a non-polling mode. The real-time traffic served by the polling mode in our study is telephony. We use an ON-OFF Markov Modulated Fluid (MMF) model to characterize telephony sources. Our analytical study and a counterpart validating simulation study show the following. Since voice codec rates are much smaller than link transmission rates, the queueing delay that arises from waiting for a poll dominates the total delay experienced by a voice packet. To keep delays low, the number of telephone calls that can be admitted must be chosen carefully according to delay tolerance, loss tolerance, codec rates, protocol overheads and the amount of bandwidth allocated to the polling mode. The effect of statistical multiplexing gain obtained by exploiting the ON-OFF characteristics of telephony traffic is more noticeable when the impact of polling overhead is small.

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“…Existing researches for voice communication mainly focus on one-to-one communication. The examples of solutions for one-to-one communication are DECT [1] for cordless phone and bluetooth [2] for a wireless handsfree. The existing solution for multi-user communication is the Push-to-Talk (PTT) service.…”

Section: ⅰ Introductionmentioning

confidence: 99%

A study on the Implementation Extended Concept of GTS in IEEE 802.15.4

Jeon¹

2015

The Journal of the Korea institute of electronic communication

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Remarkable advances in wireless communication technology have enabled communications among people who are far away from each other. In recent, the needs of local area voice communication using a wireless system based on low-cost and simple hardware are rapidly rising. However, since these applications require that the multi-users communicate on the same wireless channel in a small area, the existing voice technologies are not suitable for directly applying to these applications. Therefore, in this paper I propose a novel idea enabling multi-user voice communication. In particular, as a short range wireless solution, I employ the IEEE 802.15.4 based on low power and low cost. However, since originally the standard is not developed for voice communication, we extend the original scheme to be suitable for the voice communication by utilizing the extended concept of GTS. The capacity and validity of the proposed scheme are evaluated through quantitative analysis in various voice compression rates.

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CBR packetized voice transmission in IEEE802.11 networks

Abstract: Abstract

Cited by 10 publications

References 4 publications

An opportunistic cross‐layer architecture for voice in multi‐hop wireless LANs

An opportunistic cross‐layer architecture for voice in multi‐hop wireless LANs

Analysis of a polling system for telephony traffic with application to wireless LANs

A study on the Implementation Extended Concept of GTS in IEEE 802.15.4

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