Medium Access and Transport Protocol Aspects in Practical 802.11 ad Networks

Assasa, Hany; Saha, Swetank Kumar; Loch, Adrian; Koutsonikolas, Dimitrios; Widmer, Joerg

doi:10.1109/wowmom.2018.8449795

Cited by 23 publications

(13 citation statements)

References 30 publications

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“…While there is a plethora of works analyzing in detail the link-level performance over mmWave, most are based on non-COTS (commercial offthe-shelf) and/or custom hardware [1], [7]- [9]. Recently, two works provided the first performance studies of networking using fully-compliant 802.11ad COTS products [10], [11]. The study in [10] provides one of the first evaluations of a WLAN deployment based on 802.11ad and as such, is aimed at exploring questions related to range, placement and coverage.…”

Section: Imentioning

confidence: 99%

Association and Reliability in 802.11ad Networks: An Experimental Study

Dahhani

Jakllari

Beylot

2019

2019 IEEE 44th Conference on Local Computer Networks (LCN)

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With the exponential increase in wireless data traffic risking to overwhelm the current networking infrastructures, mmWave networking is seen as on of the most promising paths out of the logjam. IEEE introduced a new standard recently, 802.11ad, that uses mmWave frequencies for delivering multi-Gigabit capacities in a WLAN setting. Such capacities, however, do not come for free: mmWave frequencies have poor propagation characteristics and suffer from blockage, whose consequences on the networking protocols are not fully understood.In this paper, we aim at in-depth understanding of two key primitives in 802.11ad networks in environments rich with blockage: user association and reliability. Using careful measurements on COTS hardware, we find that user association under blockage takes an unreasonably long time, and, after analyzing the causes, provide practical insights on how to reduce this time by an order of magnitude. Relying on a multi-layer tracing tool allowing unprecedented granularity in the analysis of 802.11ad networks, we find that the part of the new standard regarding reliability is underspecified leading to different interpretations in practice. Their potential impact on performance is then evaluated using trace-based simulations, which reveal an interesting throughputreliability tradeoff. Finally, we find that TCP is poorly prepared for sudden changes in round-trip timeouts, as those induced by link blockage in mmWave networks, leading to an unnecessary increase in timeouts.

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Section: Imentioning

confidence: 99%

Association and Reliability in 802.11ad Networks: An Experimental Study

Dahhani

Jakllari

Beylot

2019

2019 IEEE 44th Conference on Local Computer Networks (LCN)

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“…The 60 GHz networks that operate in a huge underutilized unlicensed band can provide multi‐Gbps links. However, the high‐throughput wireless technology has two drawbacks 8,9 . On the one hand, the transmission range of 60 GHz signal is shorter than that of conventional wireless signal, usually within a few meters, because the signal with short wavelength attenuates more severely in the air.…”

Section: Introductionmentioning

confidence: 99%

Energy‐efficient Link Scheduling in Time‐variant Dual‐Hop 60GHz Wireless Networks

Chen

et al. 2020

Concurrency and Computation

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Dual-hop 60 GHz wireless networks which support relay-assisted dual-hop transmission have been widely adopted in the recent years, aiming to prolong communication distance and bypass obstacles in 60 GHz band. However, it is very challenging to perform link scheduling in such dual-hop architecture while considering several factors, i.e., reducing network power consumption, avoiding overloaded APs/relays and adapting to network dynamics. To this end, we investigate the problem of energy-efficient link scheduling with load constraints (ELL), and propose solutions to deal with network dynamics. First, we present a fine-grained energy model for dual-hop 60 GHz networks, and formulate the ELL problem as an integer linear programming model that aims to minimize the network power consumption, while satisfying AP/relay load constraints. Then, we propose a polynomial-time global scheduling algorithm that obtains a near-optimal link scheduling solution via iterative relaxation, and the load constraint at each AP/relay can only be violated by at most an additive constant of two. Moreover, we present a local adjustment algorithm to adjust link-scheduling solutions efficiently, such as client arrival/departure and link blockage, and design a hybrid algorithm that combines global scheduling and local adjustment. Finally, we conduct simulation experiments that validate our algorithms' effectiveness and efficiency.

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“…Nguyen et al provide empirical measurement results on the performance of 802.11ad WLANs. Assasa et al use 802.11ad test bed measurements to study (a) the impact of channel contention on buffer size at the transport layer, (b) the effect of frame aggregation, and (c) the efficiency of spatial sharing.…”

Section: Introductionmentioning

confidence: 99%

Combining contention‐based access and dynamic service period allocation for performance improvement in IEEE 802.11ad mmWave WLAN

Mishra

Babu

2020

Int J Communication

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Summary In IEEE 802.11ad millimeter wave wireless LANs, the directional multi‐giga bit stations (DMGSTAs) use contention‐based access periods (CBAPs) and scheduled service periods (SPs) for medium access. The STAs carrying non‐QoS traffic use CBAPs, while SPs are allocated for STAs carrying high QoS applications. During CBAP, the STAs use enhanced distributed channel access (EDCA) scheme. Further, 802.11ad advocates dynamic allocation of SP for guaranteed data transmission based on a centralized polling scheme. The standard advocates that the coverage area around the access point can be divided into several sectors, and the total CBAP shall be divided among the sectors on a time sharing basis. The STAs residing within a sector simultaneously contend during the CBAP fraction of that sector. However, such STAs have to defer their transmission attempts and wait for the designated CBAP fraction of the succeeding beacon interval (BI), if the residual time in the current CBAP fraction is not sufficient for a frame transmission. This leads to very high delay and reduced throughput. The objective of this paper is to propose an efficient hybrid medium access control scheme, where the deferred STAs during CBAP are scheduled again by utilizing the unallocated slots in the SP of the same BI. We describe an analytical model for the throughput and the average frame delay, under the proposed scheme, and compare the performance against the legacy scheme, where the STAs use CBAP alone for channel access. The analytical and simulation results establish that the proposed scheme significantly improves the throughput and reduces the average frame delay.

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Medium Access and Transport Protocol Aspects in Practical 802.11 ad Networks

Cited by 23 publications

References 30 publications

Association and Reliability in 802.11ad Networks: An Experimental Study

Association and Reliability in 802.11ad Networks: An Experimental Study

Energy‐efficient Link Scheduling in Time‐variant Dual‐Hop 60GHz Wireless Networks

Combining contention‐based access and dynamic service period allocation for performance improvement in IEEE 802.11ad mmWave WLAN

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