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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23 Aug 2016
TL;DR: In this article, the authors propose to use spatial multiplexing in conjunction with a wire-based medium to mitigate wirebased interferences and achieve spatial division-multiple-access.
Abstract: Systems and methods for: (i) using spatial multiplexing to mitigate wire-based interferences, (ii) using spatial multiplexing in conjunction with a wire-based medium, (iii) re-using a plurality of streams associated with spatial multiplexing and transported over a wire-based medium, (iv) preventing a first wireless transmission from interfering with a second wireless transmission both transported over a wire-based medium, (v) covering wirelessly multiple spatial locations via a wire-based medium using grouping of streams associated with spatial multiplexing, (vi) achieving spatial-division-multiple-access via a wire-based medium by grouping of streams in conjunction with a plurality of spatial locations, (vii) using wireless frame aggregation to mitigate wire-based interferences, and (viii) transporting a plurality of streams associated with spatial multiplexing over a wire-based medium together with corresponding mixer signals.
01 Oct 2017
TL;DR: This work investigates extensions to scheduling based MAC protocols that exploit the multirate transmission capability of the radios to increase the utilization of transmission assignments.
Abstract: The applications for MANETs have increased rapidly and today MANETs are capable of providing a variety of services. One of the major contributing factors is the availability of radios that are able to adapt to the channel conditions and can transmit at multiple data rates. A common approach for channel access is to employ a CSMA/CA based mechanism. However, these protocols tend to under perform at heavy loads or due to exposed/hidden nodes. One solution to this problem is to use a scheduling based MAC protocol. While transmission scheduling avoids collisions, these approaches often suffer from inefficient utilization of the channel. We investigate extensions to scheduling based MAC protocols that exploit the multirate transmission capability of the radios to increase the utilization of transmission assignments.
TL;DR: New transmission procedures present in IEEE 802.11 standard are presented and analytical equations are derived that allow calculate network efficiency or effective throughput and the throughput upper limit is calculated.
Abstract: The paper presents new transmission procedures present in IEEE 802.11 standard and compares them to the “traditional” frame exchange method. On the basis of their operating rules, analytical equations are derived that allow calculate network efficiency or effective throughput. The throughput upper limit is also calculated and compared for all considered frame exchange procedures.
01 Nov 2008
TL;DR: This work presents a queue aware scheduling scheme that take into account the instantaneous channel capacities and queue sizes simultaneously, named as Aggregate Opportunistic Scheduling (AOS), and presents the proposed algorithms with comparative detailed performance analysis as they are applied into the next generation WLANs.
Abstract: (The final version of the chapter does not involve an abstract. Introduction is provided below.)
Wireless access has been increasingly popular recently due to portability and low cost of wireless terminals and equipment. The emerging technologies for wireless local area networks (WLANs) are defined by the IEEE 802.11n standard, where physical layer data rates exceeding 200 Mbps are provisioned with multiple input multiple output antenna techniques. However, actual throughput to be experienced by WLAN users is considerably lower than the provided physical layer data rates, despite the link efficiency is enhanced via
the frame aggregation concept of 802.11n.
In a multi user communication system, scheduling is the mechanism that determines which user should transmit/receive data in a given time interval. Opportunistic scheduling algorithms maximize system throughput by making use of the channel variations and multi user diversity. The main idea is favouring users that are experiencing the most desirable channel conditions at each scheduling instant, i.e. riding the peaks. While maximizing capacity, such greedy algorithms may cause some users to experience unacceptable delays and
unfairness, unless the users are highly mobile. In order to remedy this problem, we combine aggregation and opportunistic scheduling approaches to further enhance the throughput of next generation WLANs. We argue that aggregation can dramatically change the scheduling scenario: A user with a good channel and a long queue may offer a higher throughput than a user with better channel conditions but shorter queue. Hence, the statement that always
selecting the user with the best channel maximizes throughput is not valid anymore.
In this work, we first present our queue aware scheduling scheme that take into account the instantaneous channel capacities and queue sizes simultaneously, named as Aggregate Opportunistic Scheduling (AOS). Detailed simulations results indicate that our proposed algorithm offers significant gains in total system throughput, by up to 53%, as compared to opportunistic schedulers while permitting relatively fair access. We also improve AOS with the principle of relayed transmissions and show the improvements of opportunistic relaying. Later on, we propose another scheduler, which aims to maximize the network
throughput over a long time scale. For this purpose, we estimate the statistical evolution of queue states and model the 802.11n MAC transmissions using queuing theory by extending the bulk service model. Utilizing the outcomes of the queuing model, we design Predictive Scheduling with time-domain Waterfilling (P-WF) algorithm. P-WF further improves the performance of our queue aware schedulers, as the throughput is maximized by applying the water filling solution to time allocations.
This chapter includes an overview of existing literature on opportunistic scheduling for wireless networks in general and presents our proposed algorithms with comparative detailed performance analysis as they are applied into the next generation WLANs.
TL;DR: In this paper, a demand on request and performance evaluation of VMP is evaluated and the most common performance metrics are delay and throughput are compared with existing Mac protocol.
Abstract: MAC Protocol (VMP) in EPON based access networks. In triple-play (Data, Voice, and Video) service scenarios for such EPON based access networks, Optical network technologies are expected to converge in the near future, since the fiber networks hold great promise as future broadband communication. Video traffic will likely dominate in triple-play service scenarios for each fiber networks. It is proposed to introduce and analyze the Video MAC Protocol (VMP) to efficiently deliver pre-recorded video downstream to consumers over a fiber network in presence of voice and data upstream and downstream traffic. The VMP consists of three main components: (i) Frame Fragmentation and Hierarchical frame Aggregation, (ii) Multi-Polling Channel Access, and (iii) Prefetching for VBR Video Streams. By introducing VMP we are going to analyze the throughput- delay performance for all three traffic types: Voice Traffic, Video Traffic, and Data Traffic. In this paper we are evaluating a demand on request and performance evaluation of VMP. Video streaming according to the user requirement and encoded in three quality types of Video for low, medium and high quality users and the most common performance metrics are delay and throughput are compared with existing Mac protocol.