Topic
Frame aggregation
About: Frame aggregation is a research topic. Over the lifetime, 487 publications have been published within this topic receiving 14295 citations.
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11 May 2009
TL;DR: The proposed approach outperforms state-of-the-art 802.11n for different packet sizes and stations to be served and combines this concept with channel-dependent OFDMA resource assignments, yielding a higher PHY efficiency and MAC efficiency.
Abstract: State-of-the-art wireless local area networking enables frame aggregation as approach to increase MAC efficiency. However, frame aggregation is limited to the aggregation of packets destined for the same station. In order to serve different stations, the access point still has to contend for the channel multiple times. In this paper we propose and evaluate a novel approach that enables multi-user frame aggregation. We combine this concept with channel-dependent OFDMA resource assignments, yielding a higher PHY efficiency (by exploiting multi-user diversity and instantaneous channel state information) as well as a higher MAC efficiency. The downside to this approach is the increase in protocol overhead to enable such multi-user OFDMA frame aggregation. However, we show that the proposed approach outperforms state-of-the-art 802.11n for different packet sizes and stations to be served.
20 citations
18 Dec 2014
TL;DR: An in-depth investigation into the harmful effect of FA on ABE using WBest is conducted and an enhanced version of WBest termed WBest+ is developed that incorporates two key design principles to counter FA effects.
Abstract: We consider for the first time available bandwidth estimation (ABE) in the context of 802.11n, which is fast replacing the legacy 802.11a/b/g networks. We experimentally show that the frame aggregation (FA) feature of 802.11n is the dominant one among 802.11n features affecting the ABE. Using an indoor 802.11n wireless testbed, we compare three ABE tools (WBest, DietTopp and pathChirp) in various cross-traffic scenarios. We find that FA significantly hurts the accuracy of all ABE tools; DietTopp and pathChirp are relatively more robust than WBest. Because faster available bandwidth estimation and less intrusiveness are desirable properties of any ABE tool and WBest satisfies them relatively better than the other two tools, we conduct an in-depth investigation into the harmful effect of FA on ABE using WBest. This in turn led us to come up with two key design principles to counter FA effects: (1) treating aggregated probes as one jumbo probe; and (2) generating a larger number of probes. We then develop an enhanced version of WBest termed WBest+ that incorporates these principles. Our evaluation shows that the new version is effective in achieving accurate ABE in the presence of FA. I. INTRODUCTION End-to-end available bandwidth estimation (ABE) has a wide range of uses including adaptive application content delivery; transport-level transmission rate adaptation and admission con-
19 citations
Posted Content•
TL;DR: The impact of enhancements of PHY/MAC layer in HT-WLANs over transport/application layer protocols is discussed and different open challenges that can be explored for the development of next generation HT- WLAN technologies are list down.
Abstract: 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). 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. list down different open challenges that can be explored for the development of next generation HT-WLAN technologies.
19 citations
TL;DR: Two MAC-defined ARQ protocols are proposed to consider the effect from frame aggregation for the enhancement of network throughput andumerical evaluations show that the proposed AH-ARQ protocol can outperform the other schemes under worse channel condition; while the ASR- ARQ scheme is superior to the other mechanisms under better channel condition.
Abstract: The design of wireless local area networks (WLANs) with enhanced throughput performance have attracted significant amounts of attention in recent years. Based on the IEEE 802.11n standard, frame aggregation is considered one of the major factors to improve the system performance of WLANs from the medium access control (MAC) perspective. In order to fulfill the requirements of high throughput performance, feasible design of automatic repeat request (ARQ) mechanisms becomes important for providing reliable data transmission. In this paper, two MAC-defined ARQ protocols are proposed to consider the effect from frame aggregation for the enhancement of network throughput. An aggregated selective repeat ARQ (ASR-ARQ) scheme is proposed which incorporates the selective repeat ARQ scheme with the consideration of frame aggregation. On the other hand, for worse channel quality, the aggregated hybrid ARQ (AH-ARQ) mechanism is proposed to further enhance the throughput performance by adopting the Reed-Solomon (RS) block code as forward error correction (FEC) scheme. Novel analytical models for both the ASR-ARQ and AH-ARQ protocols are established with the consideration of interfering wireless stations. Simulations are conducted to validate and compare the proposed ARQ mechanisms based on the service time distribution and system throughput. Numerical evaluations show that the proposed AH-ARQ protocol can outperform the other schemes under worse channel condition; while the ASR-ARQ scheme is superior to the other mechanisms under better channel condition.
19 citations
01 Dec 2015
TL;DR: This paper proposes a closed-loop, cross-layer and statistic-based link adaptation algorithm called High Throughput Wireless Link Adaptation (HiWiLA) for high throughput wireless networks (HT-WLANs) where the metric of link adaptation is computed by “Received Signal Strength Indicator” of channel and observed MAC throughput.
Abstract: IEEE 802.11n and IEEE 802.11ac amendments of IEEE 802.11 standard are introduced to achieve high throughput in wireless local area networks (WLANs) with modifications in both Physical layer (PHY) and Medium Access Control (MAC) sublayer. Wireless channels are time-varying systems which are shared by multiple heterogeneous wireless stations. Every wireless station should be capable to tune dynamically its transmission rate by tuning the link properties, otherwise high transmission failures may lead to impose low system performance. In this paper, we propose a closed-loop, cross-layer and statistic-based link adaptation algorithm called High Throughput Wireless Link Adaptation (HiWiLA) for high throughput wireless networks (HT-WLANs) where the metric of link adaptation is computed by “Received Signal Strength Indicator” (RSSI) of channel and observed MAC throughput considering channel bonding, short guard interval (SGI), frame aggregation and different Modulation and Coding Scheme (MCS) levels. We analyze the performance of the proposed scheme through simulation and a practical testbed, and show that HiWiLA achieves on average 10% – 70% better throughput than the existing state of the art schemes.
19 citations