FlexVi: PHY Aided Flexible Multicast for Video Streaming over IEEE 802.11 WLANs

Park, Young Deok; Jeon, Seokseong; Jeong, Jae-Pil; Suh, Young-Joo

doi:10.1109/tmc.2019.2923995

Cited by 11 publications

(9 citation statements)

References 32 publications

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“…Similarly, OMACK [6] utilizes dedicated subcarriers for receiver feedback, but with digital encoded data instead of unary signals for individual ACK messages. FlexVi [7] uses OFDM subcarriers as a bitmap carrying NAK signals for a block of frames. Sequential transmission of individual feedback messages also helps avoid collisions, although it results in performance degradation.…”

Section: Related Workmentioning

confidence: 99%

“…Since the general problem of a multicast-enabled feedback mechanism is the same as those already discussed on the reliability problem in Section 2.1, many multicast rate control approaches follow the similar concepts. While HIMAC [5] and FlexVi [7] provide collision-tolerant feedback mechanisms, they are using simple SNR-based rate selections. An extension of OMACK is presented in [15], where the sender announces the planned data rate in RTS frames.…”

Section: Multicast Transmission Rate Selection In 80211mentioning

confidence: 99%

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Transmission Rate Sampling and Selection for Reliable Wireless Multicast

Geithner

Sivrikaya

2020

Wireless Communications and Mobile Computing

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The multicast communication concept offers a scalable and efficient method for many classes of applications; however, its potential remains largely unexploited when it comes to link-layer multicasting in wireless local area networks. The fundamental lacking feature for this is a transmission rate control mechanism that offers higher transmission performance and lower channel utilization, while ensuring the reliability of wireless multicast transmissions. This is much harder to achieve in a scalable manner for multicast when compared with unicast transmissions, which employs explicit acknowledgment mechanisms for rate control. This article introduces EWRiM, a reliable multicast transmission rate control protocol for IEEE 802.11 networks. It adapts the transmission rate sampling concept to multicast through an aggregated receiver feedback scheme and combines it with a sliding window forward error correction (FEC) mechanism for ensuring reliability at the link layer. An inherent novelty of EWRiM is the close interaction of its FEC and transmission rate selection components to address the performance-reliability tradeoff in multicast communications. The performance of EWRiM was tested in three scenarios with intrinsically different traffic patterns; namely, music streaming scenario, large data frame delivery scenario, and an IoT scenario with frequent distribution of small data packets. Evaluation results demonstrate that the proposed approach adapts well to all of these realistic multicast traffic scenarios and provides significant improvements over the legacy multicast- and unicast-based transmissions.

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Section: Related Workmentioning

confidence: 99%

Section: Multicast Transmission Rate Selection In 80211mentioning

confidence: 99%

Transmission Rate Sampling and Selection for Reliable Wireless Multicast

Geithner

Sivrikaya

2020

Wireless Communications and Mobile Computing

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“…Those unary signals are used as NACK messages and for a receiver-side rate selection mechanism. In contrast, RAMCAST [11] and FlexVi [12] use such unary signals as a collision resistant NACK mechanism, where the dedicated OFDM subcarriers are used for a bitmap representing individual packets of a block.…”

Section: A Mac Layer Multicast Reliabilitymentioning

confidence: 99%

Joint Link Rate Selection and Adaptive Forward Error Correction for High-Rate Wireless Multicast

Geithner

Sivrikaya²,

Albayrak

2022

IEEE Open J. Commun. Soc.

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Multicast communication over wireless networks has many potential applications, such as real-time audiovisual content distribution or digital signage systems with multiple remote terminals. However, today's common 802.11 networks cannot fully support such applications at the link layer due to the technical challenges in achieving both high transmission rate and high reliability for multicast data transfers. Those challenges primarily emerge from the inapplicability of immediate acknowledgment mechanisms of unicast transmissions to the multicast case and the need for finding a common transmission rate for all receivers with diverse channel conditions. The research literature in this domain mainly addresses the problem at the higher layers of the protocol stack. In this article, we present a novel approach that combines wireless link rate selection with an adaptive packet-level Forward Error Correction (FEC) mechanism in order to achieve high-rate and highly reliable multicast in 802.11 wireless networks. The integration of FEC into the 802.11 MAC layer allows direct interaction between the transmission rate and the coding scheme. As a result, potential packet losses caused by higher link rates can be compensated by the adjustable redundancy provided by FEC. In combination with an aggregated receiver feedback mechanism, this yields improved transmission efficiency and reliability for wireless multicast. We investigate this approach in a simulation environment under a realistic wireless channel model in various application scenarios with up to 50 receivers. The results represent significant performance improvements, in terms of throughput, channel utilization, and packet loss, over the state-of-the-art methods for reliable wireless multicast.

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“…Hence, sending a smaller number of frames (a single frame for a number of users instead of a number of unicast Protocol Data Unit, that sends a number of MPDUs together, and A-MSDU (Aggregated Media Access Control Service Data Unit), that makes the same at MSDU level [3]. The use of these aggregation mechanisms for sending multicast frames has been proposed in the literature [15,16].…”

Section: Channel Utilization Efficiencymentioning

confidence: 99%

Short Message Multichannel Broadcast Encryption

Salazar

Saldaña

Fernández-Navajas

et al. 2020

13th International Conference on Computational Intelligence in Security for Information Systems (CISIS 2020)

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The current use of short messages in wireless networks is highly growing. Messaging applications in mobile terminals with wireless coverage are very common in shopping, educational and transport centers, i.e. in centers of massive influx of people. This requires improving its efficiency, without losing security in such a hostile environment. In this paper, we propose an improvement in the use of the medium through a new multichannel broadcast encryption paradigm. Firstly, we rigorously demonstrate the security of our model that is characterized by two main issues: short messages and maintaining privacy in a shared frame. The improvements are obtained by reducing the transmitted overheads, saving bandwidth and airtime. To implement them, we improve the efficiency of communications, reducing the security headers to a single one, which will be shared by all receivers, while the payload is multiplexed via Chinese Remainder Theorem. In this way we reduce the packet length (less headers) and set the ratio of the encrypted text/plaintext equals to one, if we do not take into account padding and security headers. Although the model can be used by all types of networks, both wired and wireless, the improvement is more noticeable in the latter type. To make it remarkable, we quantify what this gain will consist of.

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FlexVi: PHY Aided Flexible Multicast for Video Streaming over IEEE 802.11 WLANs

Cited by 11 publications

References 32 publications

Transmission Rate Sampling and Selection for Reliable Wireless Multicast

Transmission Rate Sampling and Selection for Reliable Wireless Multicast

Joint Link Rate Selection and Adaptive Forward Error Correction for High-Rate Wireless Multicast

Short Message Multichannel Broadcast Encryption

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