IEEE 802.11aa intra-AC prioritization - A new method of increasing the granularity of traffic prioritization in WLANs

Kosek-Szott, Katarzyna; Natkaniec, Marek; Prasnal, Łukasz

doi:10.1109/iscc.2014.6912499

Cited by 14 publications

(13 citation statements)

References 8 publications

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“…Simulation results show that DEMS queuing outperforms traditional scheduling with FIFO queues. The most important advantages of DEMS queuing, in comparison to the traditional scheduling with FIFO queues, are the following: improved throughput and decreased queuing delay (mostly for high priority ACs) because of better channel usage; increased probability of transmission of time-critical traffic (e.g., video streaming) to end users, which could be advantageous, e.g., in cellular data offloading scenarios; decreased competition between frames destined to different users with parallel processing replacing the traditional FIFO approach; extendibility: the EDCA scheduling part can easily be replaced by, e.g, the 802.11aa intra-access category prioritization which provides better support for audio-video streaming [10,11]; increased flexibility: by introducing two queue levels (class and transmis- sion queues), one can either assign different ACs to the same user or the same AC to multiple users, therefore, more complex use cases can be considered. As future work we envision further enhancements of the proposed mechanism, e.g., the definition of the per-frame scheduler, and its comparison with alternate solutions.…”

Section: Discussionmentioning

confidence: 99%

Improving DL-MU-MIMO performance in IEEE 802.11ac networks through decoupled scheduling

Kosek-Szott

2017

Wireless Netw

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The IEEE 802.11ac standard introduces new downlink multi-user MIMO (DL-MU-MIMO) transmissions to up to four users in order to increase spatial reuse in wireless local area networks (WLANs). We argue that even better WLAN performance can be achieved by slightly modifying the DL-MU-MIMO scheduling. To this end we propose a new queuing mechanism based on the decoupling of EDCA and DL-MU-MIMO scheduling (DEMS) to avoid head-of-line blocking. We show that DEMS outperforms traditional 802.11ac scheduling based on first in, first out transmission queues. The improvement is shown in terms throughput achieved with: (a) more efficient channel usage, (b) increased probability of transmission of high priority traffic, and (c) decreased competition between frames destined to distinct users.

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Section: Discussionmentioning

confidence: 99%

Improving DL-MU-MIMO performance in IEEE 802.11ac networks through decoupled scheduling

Kosek-Szott

2017

Wireless Netw

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“…However, the general conclusions hold also for other standards, e.g., 802.11n/ac. 2 The intra-AC prioritization with presence of internal collisions was studied in our previous paper [11]. Different scenarios were considered in order to: select the best CBSA candidate (cf.…”

Section: Simulation Settingsmentioning

confidence: 99%

“…Other papers concentrated on reliable multicast mechanisms [6]- [8] and mathematical modeling of intra-AC prioritization [9], [10]. Additionally, in our previous paper [11] we have presented the general concept of intra-ac prioritization.…”

Section: Introductionmentioning

confidence: 99%

A novel IEEE 802.11aa intra-AC prioritization method for video transmissions

Kosek-Szott

Natkaniec

Prasnal

2014

2014 IEEE Global Communications Conference

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Ensuring QoS guarantees for real-time multimedia traffic in WLANs has recently attracted a lot of attention from standardization bodies and researchers. In order to increase the granularity of traffic prioritization and QoS support provided by EDCA, the intra-access category prioritization mechanism has been proposed in the recent IEEE 802.11aa amendment. In order to improve real time transmission over WLANs, two standard transmission selection algorithms can be used to prioritize traffic within the voice and video access categories of EDCA: the strict priority algorithm and the credit-based shaper algorithm (CBSA). This paper focuses on the improvement of video transmission over WLANs using two video transmission queues (primary and alternate) and the two traffic selection algorithms and compares the behavior of IEEE 802.11aa with legacy EDCA. Additionally, it comments on the possible ways of CBSA implementations. Finally, it proposes an adjustment of CBSA to wireless environment (WCBSA) which gives the most promising results.

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“…The IEEE 802.11 working group proposed IEEE 802.11e and IEEE 802.11aa for this purpose. Under these standards, various methods are proposed to guarantee QoS [1], [2].…”

Section: Introductionmentioning

confidence: 99%

“…Thus, it is difficult to adopt the proposed methods on a typical WLAN network. Furthermore, in [2], it is reported that throughput is not sufficient when IEEE 802.11e and IEEE 802.11ac are used in combination. Therefore, it is impossible for a public WLAN to guarantee QoS since many unspecified users exist.…”

Section: Introductionmentioning

confidence: 99%

A Minimum Contention Window Control Method for Lowest Priority Based on Collision History of Wireless LAN

Hanzawa

2017

IJNC

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Because of the widespread adoption of mobile devices, many applications have provided support for wireless LAN (WLAN). Under these circumstances, one of the important issues is to provide good quality of service (QoS) in WLAN. For this purpose, Dhurandher et al. improved the distributed coordination function (DCF). In this method, the contention window (CW) is divided into multiple ranges. Each range is independent of all other ranges and is assigned to a different priority. Although the highest-priority throughput increased using this method, throughput for the other priorities decreased significantly. To overcome this problem, this paper proposes a minimum contention window control method for two (high and low) priorities. In the method, all nodes are assumed to use real-time applications or data transmission. The former real-time frames are high priority and are sent by UDP. The latter data frames are low priority and are sent by TCP. The purpose of the proposed method is not only to provide good QoS for the highest priority but also to prevent deterioration in the QoS for other priorities in WLAN. For this purpose, the proposed method keeps the CW for the high priority at a low value and controls the CW for the low priority based on the collision history. Finally, the network simulations demonstrated that the proposed method reduces the decrease in the average total throughput of the low priority frames as well as reducing the packet drop rate of both priorities, compared with those for the DCF and Dhurandher's method. From a simulation scenario where there are only low priority flows in wider bandwidths, all methods give almost same average total throughput and packet drop rate, but the results also suggest that the CW range in the proposed method should be reduced to improve the average total throughput, when no congestion occurs.

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IEEE 802.11aa intra-AC prioritization - A new method of increasing the granularity of traffic prioritization in WLANs

Cited by 14 publications

References 8 publications

Improving DL-MU-MIMO performance in IEEE 802.11ac networks through decoupled scheduling

Improving DL-MU-MIMO performance in IEEE 802.11ac networks through decoupled scheduling

A novel IEEE 802.11aa intra-AC prioritization method for video transmissions

A Minimum Contention Window Control Method for Lowest Priority Based on Collision History of Wireless LAN

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