Can Wi-Fi 7 Support Real-Time Applications? On the Impact of Multi Link Aggregation on Latency

Naik, Gaurang; Ogbe, Dennis; Park, Jung‐Min

doi:10.1109/icc42927.2021.9500256

Cited by 33 publications

(11 citation statements)

References 8 publications

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“…Some recent papers evaluate the performance of STR multi-link operation of 802.11be. The authors [23] use a custom MATLAB-based simulator to demonstrate that STR multi-link operation in Wi-Fi can reduce the worst-case latency by order of magnitude and satisfy stringent worst-case latency requirements in dense traffic conditions, which is especially helpful for RTA. However, the authors analyze only how STR MLDs reduce latencies.…”

Section: Literature Reviewmentioning

confidence: 99%

Study of Multi-Link Channel Access Without Simultaneous Transmit and Receive in IEEE 802.11be Networks

Korolev¹,

Levitsky

Startsev

et al. 2022

IEEE Access

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Native support for multi-link operation is a key novelty of the future Wi-Fi 7 technology defined by the IEEE 802.11be standard, which is currently under development. With the 6 GHz band recently granted for Wi-Fi operation, the novel multi-link feature enables simultaneous usage of multiple wide channels. Thus, it multiplies the capacity of Wi-Fi networks well beyond the 30 Gbps target of Wi-Fi 7. However, not all stations can simultaneously transmit and receive (STR) information on several links because of cross-channel interference. That is why it is proposed to synchronize the transmissions on different channels. The presence of legacy stations not supporting the multi-link operation raises many issues related to multi-link channel access performance and fairness. This paper evaluates various channel access approaches considered in the context of the Wi-Fi 7 non-STR operation and discusses how to organize channel access in multi-link Wi-Fi 7 congested networks to be both efficient and fair, even in the presence of legacy stations.INDEX TERMS 802.11be, Wi-Fi 7, multi-link, simultaneous transmission and reception, channel access.

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Section: Literature Reviewmentioning

confidence: 99%

Study of Multi-Link Channel Access Without Simultaneous Transmit and Receive in IEEE 802.11be Networks

Korolev¹,

Levitsky

Startsev

et al. 2022

IEEE Access

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“…It enables frame transmission and retransmission on any link regardless of the link of the initial transmission of the frame. e IEEE 802.11be group has designed a new association procedure that allows AP MLD and STA MLD to establish a connection on any supported link [23]. e capabilities of all the links can be exchanged in any enabled link as well.…”

Section: 11be Multilink Operationmentioning

confidence: 99%

Enhanced Multilink Single-Radio Operation for the Next-Generation IEEE 802.11 BE Wi-Fi Systems

Lan

Yang

2022

Security and Communication Networks

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For the next-generation Wi-Fi systems, the Enhanced Multilink Single-Radio (EMLSR) operation has become a promising feature to improve the Wi-Fi system performance. The EMLSR enables dynamic switching among multiple bands with low-cost implementation and efficient power consumption. However, with realistic channelization of multiple links with 320 MHz bandwidth on 6 GHz and 160 MHz bandwidth on 5 GHz, the performance of EMLSR is jeopardized due to the crowded 5 GHz band with existing Wi-Fi systems. In addition, the unbalanced bandwidth configuration between an access point (AP) and stations (STAs) multilink devices (MLDs) may result in wasted secondary channels when STAs supporting smaller bandwidth stay on the primary channel only. We proposed the further enhanced EMLSR with a new MAC protocol and link selection mechanism, where a primary link (PL) is selected between AP and STA with the unbalanced Link/Band and one or multiple secondary links (SLs) with balanced Link/Band. The STA tunes the main radio on the PL and the scan radio to one of the SLs. The PL will be more prioritized than the SL based on the link selection algorithm to maximize the channel utilization. Compared with legacy EMLSR, the enhanced EMLSR can improve the utilization of the secondary channel. Even under heavy OBSS load on SL or both PL and SL, the further enhanced EMLSR can achieve 50% to 70% throughput gain.

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“…Also, this transmission mode allows the simultaneous transmission and reception (STR) capability over multiple links, enabling concurrent uplink and downlink communications. Such implementation has been proved to minimize latency [11], while maximizing the throughput [12]. Ideally, the asynchronous mode should be selected as operational scheme, however, a MLD may not be STR-capable due to the indevice coexistence (IDC) interference.…”

Section: Multi-link Operation: An Overviewmentioning

confidence: 99%

IEEE 802.11be Multi-Link Operation: When the Best Could Be to Use Only a Single Interface

López-Raventós¹,

Bellalta²

2021

Preprint

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The multi-link operation (MLO) is a new feature proposed to be part of the IEEE 802.11be Extremely High Throughput (EHT) amendment. Through MLO, access points and stations will be provided with the capabilities to transmit and receive data from the same traffic flow over multiple radio interfaces. However, the question on how traffic flows should be distributed over the different interfaces to maximize the WLAN performance is still unresolved. To that end, we evaluate in this article different traffic allocation policies, under a wide variety of scenarios and traffic loads, in order to shed some light on that question. The obtained results confirm that congestion-aware policies outperform static ones. However, and more importantly, the results also reveal that traffic flows become highly vulnerable to the activity of neighboring networks when they are distributed across multiple links. As a result, the best performance is obtained when a new arriving flow is simply assigned entirely to the emptiest interface.

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Can Wi-Fi 7 Support Real-Time Applications? On the Impact of Multi Link Aggregation on Latency

Cited by 33 publications

References 8 publications

Study of Multi-Link Channel Access Without Simultaneous Transmit and Receive in IEEE 802.11be Networks

Study of Multi-Link Channel Access Without Simultaneous Transmit and Receive in IEEE 802.11be Networks

Enhanced Multilink Single-Radio Operation for the Next-Generation IEEE 802.11 BE Wi-Fi Systems

IEEE 802.11be Multi-Link Operation: When the Best Could Be to Use Only a Single Interface

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