Frame aggregation

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

New adaptive frame aggregation call admission control AFA-CAC for high throughput WLANs

Abstract: The major enhancements introduced by the very high throughput wireless local area network, cannot provide quality of service QoS satisfaction for real time and multimedia applications. The recent standard IEEE 802.11n introduced new Medium Access Control MAC mechanisms based on aggregation scheme to enhance throughput. Besides that, functional modules for QoS provisioning such as call admission control and bandwidth management should be implemented in the access point. Hence, an efficient call admission control CAC algorithm is required for 802.11n network to satisfy QoS requirements of strict multimedia services. In this paper, we propose a new model-based call admission control algorithm, called adaptation of frame aggregation AFA-CAC to be implemented within the QoS access point in IEEE 802.11n standard in a way to provide QoS satisfaction to real time services. We first propose an accurate analytical model to estimate the achieved QoS metrics of a new flow entering in the network. Then, we detailed the AFA-CAC algorithm that supports IEEE 802.11n aggregation schemes aggregated MAC service data unit and aggregated MAC protocol data unit and consider the IEEE 802.11e enhanced distributed channel access. AFA-CAC is based on both predicting the QoS constraints of the already active flows and the new flow, and adjusting the number of aggregated subframes of each flow. Conducted simulations illustrate the performance of our proposed AFA-CAC in terms of satisfying QoS throughput and end-to-end delay requirements of voice and video traffics. Copyright © 2013 John Wiley & Sons, Ltd.

Suitability of IEEE 802.11ac/n/p for Bandwidth Hungry and Infotainment Applications for Cities

Abstract: The Intelligent Transportation System (ITS) addresses issues regarding road safety and efficiency in the domain of Vehicular Ad hoc Networks (VANETs). In the last few years, research in ITS has been focused on delay sensitive and bandwidth hungry applications, which demand time bounded and high throughput services. In this paper, we analyzed 802.11ac, n and p with regard to their suitability in different VANET scenarios, specifically where applications require reliability and high data rate. We simulated these standards by considering different urban scenarios and varying different parameters such as speed, nodes, traffic loads, and bit error rate etc. We observed that 802.11n and 802.11ac performed comparatively well in most of the scenarios due to their enhanced MAC layer mechanisms. Frame aggregation with block acknowledgement significantly increases the bandwidth and reduces the delay. IEEE 802.11p, on other hand, allows transmission range of 1000 m, which is five times larger than for 802.11n or 802.11ac.

QoS-Aware Radio-and-Fiber (R&F) Access-Metro Networks

Abstract: Future bimodal fiber-wireless (FiWi) access-metro networks may deploy both radio-over-fiber (RoF) and radio-and-fiber (R&F) technologies. RoF networks are rapidly becoming mature, but they fall short of interworking with distributed wireless MAC protocols such as DCF in widely deployed IEEE 802.11 WLANs. While R&F networks are able to avoid this limitation by means of protocol translation at the optical-wireless interface, recent testbed activities demonstrated that their multimedia QoS performance is far from acceptable, giving rise to various open R&F networking issues. In this paper, we report on our ongoing research activities on providing improved QoS support in R&F access-metro networks by means of (i) hierarchical scheduling and hybrid access control in integrated RPR/WiMAX metro networks, and (ii) hierarchical frame aggregation in integrated EPON/next-generation WLAN-based mesh access networks.

Enhanced frame aggregation in a wireless network system

Abstract: Variable-length information-containing frames (e.g., MPDUs) are aggregated into a bitstream using frame delimiters to distinguish the frames. Aggregation and frame extraction techniques are provided that support recovery from bit errors that may be present in a frame delimiter. One class of techniques involves providing redundant length information in the frame delimiters, e.g., by using multiple copies of a length field or error correction codes usable to correct errors in the length field. The receiver can use the redundant information to detect and correct errors in the length field. Another receiver-side technique iteratively attempts to locate the end of the corresponding frame when a corrupt frame delimiter is detected. Conventional synchronization fields may be eliminated.

Delay analysis of mixed fronthaul and backhaul traffic under strict priority queueing discipline in a 5G packet transport network

Abstract: Virtualization of the base station for the purpose of centralization is being actively studied and researched as an implementation option for 5G mobile networks. Proposed as Cloud radio access network, the technology is expected to facilitate easier operation and maintenance than regular radio access networks. However, the base stations traffic has stringent delay requirements. In this paper, we explore the possibility of multiplexing fronthaul traffic and traditional backhaul traffic as it traverses over the metropolitan network while keeping the average fronthaul queueing delay and jitter under control. We analyze and simulate the cases of a single fronthaul flow and multiple fronthaul flows arriving at the packet switch assuming strict priority for the fronthaul queue. We propose a fronthaul frame aggregation strategy to improve the packet transmission efficiency while keeping the average fronthaul queueing delay and jitter constant regardless of the percentage of fronthaul traffic. While the criteria for aggregation is different for the 2 cases, we show that the optimal number of basic frames to aggregate is between 3-10 frames assuming the Common Public Radio Interface protocol.