Frame aggregation

About: Frame aggregation is a research topic. Over the lifetime, 487 publications have been published within this topic receiving 14295 citations.

Green Frame Aggregation Scheme for IEEE 802.11n Networks

Abstract: Frame aggregation is one of the major MAC layer enhancements in the IEEE 802.11 family that boosts the network throughput performance. It aims to achieve higher throughput by transmitting huge amount of data in a single transmit oppor- tunity. With the increasing awareness of energy e ciency, it has become vital to rethink about the design of such frame aggregation protocol. Aggregation techniques help to reduce energy consumption over ideal channel conditions. However, in a noisy channel environment, a new energy-aware frame aggregation scheme is required. In this thesis, a novel Green Frame Aggregation (GFA) scheduling scheme has been proposed and evaluated. GFA optimizes the aggregate size based on channel quality in order to minimize the consumed energy. GFA selects the optimal sub-frame size that satisfies the loss constraint for real-time applications as well as the energy budget of the ideal channel situations. The design, the implementation, and evaluation of GFA using testbed deployment is done. The experimental analysis shows that GFA outperforms the conventional frame aggregation methodology in terms of energy e ciency by about 6⇥ in the presence of severe interference conditions. Moreover, GFA also outperforms the static frame sizing method in terms of network goodput and maintains almost the same end- to-end latency.

Frame management in wireless networks

Abstract: The analysis of frames transmitted in 802.11a/n/ac demonstrates performance degradation when many devices need to transfer large data volumes. Furthermore, despite the frame aggregation implemented by newer standards (802.11n/ac), the same performance degradation was observed. The experiments in this research show that, regardless of the standard, it is possible to apply management techniques in aggregated frames in order to define the maximum frame size that can be transmitted. The results of this research show that, under specific conditions, the limitation of the maximum size of frames can enhance the performance of wireless networks despite standard revision.

Robust coding in multi-hop networks

Abstract: The invention generates the data unit to a method and apparatus utilizing a multi-receiver (MR) to the frame aggregation to require an acknowledgment of a single packet data unit by the group of which they are intended receiver. In addition to the main destination of the packet, the neighbors of a destination node of a multi-hop topology information may be used to obtain the intended receiver of the acknowledgment packet transmission.

Medium access control and network planning in wireless networks

Abstract: Wireless Local Area Networks (WLANs) and Wireless Metropolitan Area Networks (WMANs) are two of the main technologies in wireless data networks. WLANs have a short range and aim at providing connectivity to end users. On the other hand, WMANs have a long range and aim at serving as a backbone network and also at serving end users. In this dissertation, we consider the problem of Medium Access Control (MAC) in WLANs and the placement of Relay Stations (RSs) in WMANs. We propose a MAC scheme for WLANs in which stations contend by using jams on the channel. We present analytic and simulation results to find the optimal parameters of the scheme and measure its performance. Our scheme has a low collision rate and delay and a high throughput and fairness performance. Secondly, we present a MAC scheme for the latest generation of WLANs which have very high data rates. In this scheme, we divide the stations into groups and only one station from each group contends to the channel. We also use frame aggregation to reduce the overhead. We present analytic and simulation results which show that our scheme provides a small collision rate and, hence, achieves a high throughput. The results also show that our scheme provides a delay performance that is suitable for real-time applications and also has a high level of fairness. Finally, we consider the problem of placing Relay Stations (RSs) in WMANs. We consider the Worldwide Interoperability for Microwave Access (WIMAX) technology. The RSs are used to increase the capacity of the network and to extend its range. We present an optimization formulation that places RSs in the WiMAX network to serve a number of customers with a pre-defined bit rate. Our solution also provides fault-tolerance by allowing one RS to fail at a given time so that the performance to the users remains at a predictable level. The goal of our solution is to meet the demands of the users, provide fault-tolerance and minimize the number of RSs used.

Performance analysis of WiMedia UWB system with wireless video traffic

Abstract: Using Markov chain model we propose a queueing model to analyze the performance of WiMedia system with frame aggregation of video traffic. Then we propose an analytic method to find the solution of the queueing model. To validate the proposed method, we compare the simulation result and the analytic solution in the average throughput, the mean delay, and the frame loss rate.