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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12 May 2011
TL;DR: A novel opportunistic relay selection scheme when frame aggregation is adopted and a relay is selected in a distributed manner by considering the amount of data as well as channel conditions, and therefore the most appropriate relay can be chosen.
Abstract: In conventional opportunistic relay selection schemes, one or multiple relay with better channel conditions are selected. However, if frame aggregation for improving MAC throughput is supported, each relay can have different amounts of data and thus conventional selection schemes may choose a worse relay with good channel conditions but little data. Therefore, we propose a novel opportunistic relay selection scheme when frame aggregation is adopted. In the proposed scheme, a relay is selected in a distributed manner by considering the amount of data as well as channel conditions, and therefore the most appropriate relay can be chosen.
1 citations
TL;DR: This paper introduces queue theory into the performance analysis of frame aggregation scheme and adopts two-level buffer mechanism and polls each queue for aggregation according to aggregation weight factor.
Abstract: Abstract: Frame aggregation is one of the efficient methods to improve wireless channel utility of MAC (Media Access Control) and spectral efficiency. Aiming at multi-services, this paper adopts two-level buffer mechanism and polls each queue for aggregation according to aggregation weight factor. The aggregation weight factor of each queue is dynamically adjusted based on the packet overtime urgent factor defined to meet with the delay requirement of each QoS type of service. This paper introduces queue theory into the performance analysis of frame aggregation scheme. A mathematical analysis model is set up. Additionally, the relationship of main performance parameters and system load is quantificationally analyzed. Compared with the performance of the two-level aggregation scheme defined in IEEE 802.11n standard, the proposed scheme indicates the performance of the new frame aggregation scheme is more efficient than the two-level aggregation scheme defined in 802.11n standard.
1 citations
17 Jul 2020
TL;DR: The A-MSDU mechanism can improve the performance of the multi-hop system to a certain extent, but it will also bring higher system delay and LPR, which often severely weakens the system performance in the case of a poor channel environment.
Abstract: IEEE 802.11 utilizes frame aggregation to reduce the MAC overhead and to increase the throughput. Frame aggregation technology is also used in linear multi-hop wireless networks to improve end-to-end system performance. We analyze the performance of the A-MSDU aggregation scheme in a wireless linear multi-hop network. Meanwhile, we also discussed the impact of UDP payload size on frame aggregation performance. A performance study using the discrete-event simulator ns-3 illustrates the changing of end-to-end throughput in different environments. We find that the A-MSDU mechanism can improve the performance of the multi-hop system to a certain extent, but it will also bring higher system delay and LPR. The latter often severely weakens the system performance in the case of a poor channel environment. Too high an LPR will cause a decrease in throughput. Therefore, we need to be careful when choosing whether to use the A-MSDU mechanism and the size of the A-MSDU Limit.
1 citations
TL;DR: Simulation results show that the proposed FAB scheme can significantly improve the performance of inter-vehicle communications.
Abstract: In vehicular ad hoc networks (VANETs), due to highly mobile and frequently changing topology, available resources and transmission opportunities are restricted. To address this, we propose a burst transmission and frame aggregation (FAB) scheme to enhance transmission opportunity (TXOP) efficiency of IEEE 802.11p. Aggregation and TXOP techniques are useful for improving transmission performance. FAB aggregates frames in the relay node and utilizes the TXOP to transmit these frames to the next hop with a burst transmission. Simulation results show that the proposed FAB scheme can significantly improve the performance of inter-vehicle communications.
1 citations
07 May 2007
TL;DR: This paper proposes a mechanism to dynamically select the aggregation size based on the channel condition prediction which reduces the number frames dropped due to wireless error, and within a certain delay bound a link level retransmission mechanism can be used to improve the quality of the multimedia applications.
Abstract: To overcome the low effective throughput of the popular IEEE 802.11 WLANs, a high performance WLAN standard is being developed. This new standard not only increases the raw PHY data rate but also increases the effective throughput with different MAC layer enhancements, such as frame aggregation. For small size multimedia data packet frame aggregation can improve the quality of service (QoS) of the applications. However, the wireless channel is often time varying and location dependent. Therefore aggregation of frames increases the probability of error, since the size of the frame is increased. With erroneous wireless channel an optimum value of aggregation size can greatly improve the performance of the multimedia applications. In this paper we propose a mechanism to dynamically select the aggregation size based on the channel condition prediction which reduces the number frames dropped due to wireless error. Also within a certain delay bound a link level retransmission mechanism can be used to improve the quality of the multimedia applications.
1 citations