An Optimized A-MSDU Frame Aggregation with Subframe Retransmission in IEEE 802.11n Wireless Networks

Saif, Anwar; Othman, Mohamed; Subramaniam, Shamala; Hamid, Nor Asilah Wati Abdul

doi:10.1016/j.procs.2012.04.087

Cited by 10 publications

(4 citation statements)

References 12 publications

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“…Link adaptation is a very important issue in WLAN. There are many rate adaptation mechanisms in IEEE 802.11 WLANs [18], [21], [33], [50], [104]- [107]. But, none of them are able to meet theoretically achievable throughputs in practical scenarios in IEEE 802.11n/ac.…”

Section: Design Of Link Adaptation Mechanismmentioning

confidence: 99%

Impact of IEEE 802.11n/ac PHY/MAC High Throughput Enhancements on Transport and Application Protocols—A Survey

Karmakar

Chattopadhyay

Chakraborty

2017

IEEE Commun. Surv. Tutorials

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Since the inception of Wireless Local Area Networks (WLANs) in the year 1997, it has tremendously grown in the last few years. IEEE 802.11 is popularly known as WLAN. To provide the last mile wireless broadband connectivity to users, IEEE 802.11 is enriched with IEEE 802.11a, IEEE 802.11b and IEEE 802.11g. More recently, IEEE 802.11n, IEEE 802.11ac and IEEE 802.11ad are introduced with enhancements to the physical (PHY) layer and medium access control (MAC) sublayer to provide much higher data rates and thus these amendments are called High Throughput WLANs (HT-WLANs). In IEEE 802.11n, the data rate has increased up to 600 Mbps, whereas IEEE 802.11ac/ad is expected to support a maximum throughput of 1 to 7 Gbps over wireless media. For both standards, PHY is enhanced with multiple-input multiple-output (MIMO) antenna technologies, channel bonding, short guard intervals (SGI), enhanced modulation and coding schemes (MCS). At the same time, MAC layer overhead is reduced by introducing frame aggregation and block acknowledgement technologies. However, existing studies reveal that although PHY and MAC enhancements promise to improve physical data rate significantly, they yield negative impact over upper layer protocols -mainly for reliable end-to-end transport/application layer protocols. As a consequence, a large number of schools have focused researches on HT-WLANs to improve the coordination among PHY/MAC and upper layer protocols and thus, boost up the performance benefit. In this survey, we discuss the impact of enhancements of PHY/MAC layer in HT-WLANs over transport/application layer protocols. Several measures have been reported in the literature that boost up data rate of WLANs and use aforesaid enhancements effectively for performance benefit of end-to-end protocols. We also point out limitations of existing researches and list down different open challenges that can be explored for the development of next generation HT-WLAN technologies.

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Section: Design Of Link Adaptation Mechanismmentioning

confidence: 99%

Impact of IEEE 802.11n/ac PHY/MAC High Throughput Enhancements on Transport and Application Protocols—A Survey

Karmakar

Chattopadhyay

Chakraborty

2017

IEEE Commun. Surv. Tutorials

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“…Let P idle , P c and P succ , respectively, represent the condition probabilities that the channel is idle, a packet transmission is collided and successful in the considered slot time. Hence, according to (2) and 3, they can be derived as below…”

Section: Throughput Analysismentioning

confidence: 99%

“…the number of the aggregated subframes) of the A-MPDU retransmission will be reduced and sharply fluctuate when the conventional block acknowledgement (BlockACK) method defined in IEEE 802.11n/ac/ad is used for the A-MPDU acknowledgement, which directly limits the transmission efficiency and the throughput of the A-MPDU. Saif et al [2] and Pefkianakis et al [3] pointed out that if the first subframe in an A-MPDU with the sequence number of S f is lost and to be retransmitted in the next A-MPDU, then only the frames whose sequence numbers are less than S f + 64 [where 64 is the maximum aggregation level (MAL) of the A-MPDU frame aggregation defined in IEEE 802.11n standard] can be aggregated in the next retransmitted A-MPDU frame. That is to say, the aggregation level for the A-MPDU retransmission changes dramatically due to the effect of the sequence number of the first lost subframe, as we indicate below.…”

mentioning

confidence: 99%

Enhanced BlockACK method for A‐MPDU transmission in IEEE 802.11n/ac/ad WLANs

2016

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An enhanced block acknowledgement (BlockACK) method for the aggregate MAC protocol data unit (A-MPDU) transmission is proposed. In the proposed method, the position information of each aggregated subframe is carried by the A-MPDU using the reserved bits and a novel position information control is used to acknowledge the A-MPDU. By utilising the enhanced BlockACK method, the aggregation level of the A-MPDU transmission will not be constrained by the effect of lost subframes. Theoretical analysis and simulation results demonstrate that the enhanced BlockACK method can achieve a more stable aggregation level and higher throughput than the conventional one.

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“…Even though this method lowers transmission overhead, throughput is still limited because A-MSDU effectiveness is underutilized [16]. Furthermore, Saif et al [17] presents a frame aggregation method that allows for selective re-transmission at the MSDU level through the application of an implicit sequence control mechanism. The original MAC header is not altered in order to grant authorization.…”

Section: Introductionmentioning

confidence: 99%

Two-level frame aggregation with enhanced A-MPDU for signal-to-noise ratio efficiency in IEEE 802.11n WLANs

Sorra

Othman

Bukar

et al. 2023

IJEECS

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<p>One of the most important frame aggregation features for enhancing the speed of IEEE 802.11n wireless local area networks (WLANs) through sharing headers and timing overheads is an aggregate MAC protocol data unit (A-MPDU). However, because aggregation overhead affects A-MPDU frame size, the A-MPDU performance falls short of user expectations. The variable signal-to-noise ratio (SNR) is significantly decreased as a result of the influence of lost sub-frame on the volume of sub-frames that may be aggregated (the level of aggregation). In order to solve this issue, this study suggests an improved A-MPDU with reduced header overheads as well as a efficient two-level aggregation technique based on enhanced A-MPDU. To test the suggested plan, a simulation experiment was run on NS-3. The results show that the suggested two-level aggregation approach works better than the existing methods by achieving higher throughput, SNR, and a efficient medium access control (MAC) layer.</p>

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An Optimized A-MSDU Frame Aggregation with Subframe Retransmission in IEEE 802.11n Wireless Networks

Cited by 10 publications

References 12 publications

Impact of IEEE 802.11n/ac PHY/MAC High Throughput Enhancements on Transport and Application Protocols—A Survey

Impact of IEEE 802.11n/ac PHY/MAC High Throughput Enhancements on Transport and Application Protocols—A Survey

Enhanced BlockACK method for A‐MPDU transmission in IEEE 802.11n/ac/ad WLANs

Two-level frame aggregation with enhanced A-MPDU for signal-to-noise ratio efficiency in IEEE 802.11n WLANs

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