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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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Proceedings ArticleDOI
11 Sep 2013
TL;DR: The results show that the combination of the three mechanisms improves the system capacity for high quality voice calls while preventing the network from accepting calls which would result in call quality degradation across all calls, and while maximizing the call capacity available with a given set of network resources.
Abstract: The primary contribution of this paper is the design of a novel architecture and mechanisms to enable voice services to be deployed over femtocells backhauled using a wireless mesh network. The architecture combines three mechanisms designed to improve Voice Over IP (VoIP) call quality and capacity in a deployment comprised of meshed femtocells backhauled over a WiFi-based Wireless Mesh Network (WMN), or femto-over-mesh. The three mechanisms are: (i) a Call Admission Control (CAC) mechanism employed to protect the network against congestion; (ii) the frame aggregation feature of the 802.11e protocol which allows multiple smaller frames to be aggregated into a single larger frame; and (iii) a novel delay-piggy-backing mechanism with two key benefits: prioritizing delayed packets over less delayed packets, and enabling the measurement of voice call quality at intermediate network nodes rather than just at the path end-points. The results show that the combination of the three mechanisms improves the system capacity for high quality voice calls while preventing the network from accepting calls which would result in call quality degradation across all calls, and while maximizing the call capacity available with a given set of network resources.

6 citations

Journal ArticleDOI
TL;DR: This paper proposes a desirable resource allocation for situations of rate-diverse competition, and proposes an architecture for control at the access-point to achieve it, and demonstrates analytically and through extensive simulation that the method is able to provide significant enhancements in performance under a variety of traffic conditions.

6 citations

09 Jun 2010
TL;DR: This dissertation is to provide an in-depth view on the Medium Access Control (MAC) layer and Network layer design for 60 GHz WPANs and addresses how to support highly-reliable transmissions using 60 GHz radio.
Abstract: The unlicensed frequency band around 60 GHz is a very promising spectrum due to its potential to provide multiple gigabits per second based data rates for short range wireless communication. Hence, 60 GHz radio is an attractive candidate to enable ultra high rate Wireless Personal Area Networks (WPANs), which are expected to support wireless multimedia applications like high-definition video streaming, ultra high speed content download, etc. Till now, the main research effort related to 60 GHz radio is at the physical layer design and channel model investigation. However, the unique properties of 60 GHz radio also create new research challenges for 60 GHz networking. Hence the aim of this dissertation is to provide an in-depth view on the Medium Access Control (MAC) layer and Network layer design for 60 GHz WPANs. To obtain sufficient link budget for multiple gigabits per second based wireless communication, directional antennas are needed in 60 GHz systems. Although directional antennas exhibit many advantages compared to omni-directional antennas, their deployment is very challenging for the MAC and Network layer protocols. For instance, to set-up directional connections, devices are expected to know the direction of their neighbors. The performance of directional neighbor discovery protocols is investigated in this dissertation to review the impact of directional antennas on the network setup durations. With the knowledge of orientation information of the network components, a resource management scheme, especially for the IEEE 802.15.3 featured WPANs, is proposed to support concurrent transmissions using directional antennas in a Time Division Multiple Access (TDMA) fashion with Quality of Service (QoS) and fairness provisioning. To further improve the transmission efficiency of the MAC layer protocol, standard frame aggregation and low latency frame aggregation mechanisms are investigated to alleviate the impact of transmission overhead. Another issue addressed at the MAC layer in this dissertation is how to support highly-reliable transmissions using 60 GHz radio. Due to the weak penetration and reflection properties, the Line-of-Sight (LOS) link between two 60 GHz components is easily blocked by obstacles in indoor environments, which is a severe hurdle that influences the reliability of 60 GHz systems. To resolve the link blockage problem, instant decision based beam switching mechanisms and environment learning based beam switching mechanisms are proposed in this dissertation targeting for different usage scenarios. Furthermore, to support the coexistence of multiple 60 GHz WPANs, a systematic analysis of using synchronization frame to mitigate Co-Channel Interference (CCI) is performed. It has been shown that the link capacity and the guaranteed transmission distance within a WPAN are upper bounded by the CCI. To enable the multi-hop communication among these inter-connected 60 GHz WPANs, the Network layer design is involved in this dissertation. First, a fundamental investigation is provided in ad-hoc networks for using directional antennas in the aspects of topology control and message dissemination. The results provide valuable insights for using directional antennas for multi-hop communication. Second, focusing on the specific network topology of WPANs, the performance of inter-piconet route discovery is examined. Moreover, a joint QoS routing and channel resource allocation mechanism is proposed to resolve the inter-piconet channel resource reservation collision problem.

6 citations

Proceedings ArticleDOI
15 Jun 2020
TL;DR: This article proposes an analytical model based on a Markov chain which estimates the theoretical aggregation level for different amounts of cross traffic and shows that the theoretical model gives an accurate estimation of the frame aggregation level and that it can be used to infer the network load.
Abstract: Over the past two decades, Wi-Fi technology (defined by the IEEE 802.11 standard) has become a prominent wireless network access technology. In many situations, a device may attach to several Wi-Fi access points within the radio range. The operating system makes its choice over metrics that do not take into account the actual available capacity. To fill this gap, several proposals have been made to infer capacity, for example by estimating the occupied proportion of the channel. However, these techniques are being thwarted by the mechanisms recently introduced in 802.11 to improve transmission speeds, in particular frame aggregation. In this article, we focus on busy time inference based on frame aggregation level. We propose an analytical model based on a Markov chain which estimates the theoretical aggregation level for different amounts of cross traffic. We validate its accuracy against simulations carried out on the ns-3 network simulator and an ad-hoc simulator. Results show that the theoretical model gives an accurate estimation of the frame aggregation level and that it can be used to infer the network load.

6 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
20221
202114
202023
201922
201826
201735