Frame aggregation

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

Frame aggregation control parameters

Abstract: A method and system for defining a transmission of data within a transmission opportunity (TXOP) is described. Aspects of the present system and method are related to wireless local area network (WLAN) systems. In one embodiment, aspects of the present system may be utilized within a WLAN system operating in accordance with frame aggregation mechanisms. Other aspects of the system specify the role of access point (AP) and non-AP stations operating in a bidirectional single receiver aggregation procedure. Aspects of the described system and method provide control to an AP or other station to limit the duration of the response burst, including acknowledgement message, aggregated with one or more data frames. Other aspects indicate how bi-directional single receiver aggregate data flow should be used in infrastructure, mesh and ad hoc operation scenarios.

An Experimental Study of Routing Metrics in 802.11n Wireless Mesh Networks

Abstract: In the recent past, link quality-based routing metrics, such as ETX and ETT, have been shown to significantly outperform the traditional hopcount metric in legacy 802.11a/b/g wireless mesh networks (WMNs). The new 802.11n standard introduces a number of enhancements at the MAC/PHY layers (MIMO technology, channel bonding, frame aggregation, and more aggressive modulation and coding schemes) marking the beginning of a new generation of 802.11 radios. In this paper, we conduct one of the first experimental studies of the performance of link quality-based routing metrics in a 21-node indoor 802.11n WMN. Our study reveals that the gains of link quality-based metrics over the hopcount metric in legacy 802.11 WMNs do not carry over in 802.11n MIMO WMNs. We analyze the causes of this behavior and make recommendations for the design of new routing metrics in 802.11n WMNs.

An Optimized A-MSDU Frame Aggregation with Subframe Retransmission in IEEE 802.11n Wireless Networks

Abstract: The IEEE 802.11n standard is defined to achieve a high throughput at the MAC layer. This high throughput is accomplished via many enhancements in both the physical and MAC layers. A key enhancement introduced in the 802.11n standard is frame aggregation. Two types of aggregation defined by the 802.11n standard, aggregate MAC service data unit (A-MSDU) and aggregate MAC protocol data unit (A-MPDU). Frame aggregation reduces both the headers and timing overheads at the MAC layer by aggregating multiple frames into a single large frame before being transmitted. The aggregation headers themselves still have a negative impact on the network performance especially when aggregating frames of small payload. Moreover, the lack of partial retransmission in the A-MSDU aggregation is behind its poor performance in error-prone channels. In this paper we proposed an optimized header A-MSDU frame aggregation (OHA-MSDU) with subframes retransmission capability at the MSDU level. The simulation results show the significance of the proposed scheme, especially for applications that have a small frame size such as VoIP.

Latency-aware rate adaptation in 802.11n home networks

Abstract: Latency-sensitive applications (e.g., wireless gaming and TV remote play) are increasingly popular in home WiFi networks. Such millisecond-level latency requirements call for new fine-grained approaches at the link layer. In this paper, we show that current solutions work well for throughput but not for latency due to the long tail of the packet delay distribution. We thus propose LLRA, a new latency-aware rate adaptation scheme that reduces the tail latency for delay-sensitive applications. LLRA takes concerted design in rate control, frame aggregation scheduling and software/hardware retransmission dispatching. Our implementation and evaluation confirm the viability of LLRA in 802.11n home networks.

Efficiency analysis of IEEE 802.11 protocol with block acknowledge and frame aggregation

Abstract: The article presents data transmission methods in IEEE 80211 wireless LAN standard, including transmission efficiency improving methods like block acknowledge and two variants of frame aggregation On the basis of their operation, an analytical model is derived which allows for estimation of protocol efficiency and effective throughput under perfect conditions for various protocol parameters With this model, all transmission methods are analysed for their efficiency for two currently used physical layers, namely, OFDM (80211a/g) and HT (80211n) The calculation results are presented on graphs and discussed Finally, so-called throughput upper limit is calculated for all the methods considered in the paper