Frame aggregation

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

Improving VoIP Call Capacity of Multi-Hop Wireless Networks through Self-Controlled Frame Aggregation

Abstract: In multi-hop wireless networks, the number of supportable VoIP calls can be surprisingly small due to the increased spatial interference. To mitigate the interference, voice frame aggregation can be used. In this paper, we depart from the traditional approaches that perform aggregation at the voice source, and propose a technique called the self-controlled frame aggregation (SCFA) that runs at wireless routers. The core idea of SCFA is to let the congestion itself control the degree of aggregation. Unlike existing frame aggregation approaches, SCFA does not incur fixed delay cost, since it is used only when and by exactly as much as it is needed. In this paper, we take the example of 802.11-based multi-hop network to show the impact of SCFA, since many emerging multi-hop networks are built on the 802.11 technology. The result shows that SCFA on 802.11-based multi-hop network can boost the number of calls approximately twofold, or extends the hop distance threefold for a given number of calls to carry.

100 Gb/s Data Link Layer - from a Simulation to FPGA Implementation

Abstract: In this paper, a simulation and hardware implementation of a data link layer for 100 Gb/s terahertz wireless communications is presented. In this solution the overhead of protocols and coding should be reduced to a minimum. This is especially important for high-speed networks, where a small degradation of efficiency will lower the user data throughput by several gigabytes per second. The following aspects are explained: an acknowledge frame compression, the optimal frame segmentation and aggregation, Reed-Solomon forward error correction, an algorithm to control the transmitted data redundancy (link adaptation), and FPGA implementation of a demonstrator. The most important conclusion is that changing the segment size influences the uncoded transmissions mostly, and the FPGA memory footprint can be significantly reduced when the hybrid automatic repeat request type II is replaced by the type I with a link adaptation. Additionally, an algorithm for controlling the Reed-Solomon redundancy is presented. Hardware implementation is demonstrated, and the device achieves net data rate of 97 Gb/s. Keywords—ARQ, FEC, frame aggregation, HARQ, link adaptation, Reed-Solomon FEC, segmentation.

On the use Of IEEE 802.11n frame aggregation for efficient transport of scalable video streaming

Abstract: This paper presents, through simulation experiments, a performance study of both IEEE 802.11n aggregation methods: A-MPDU (Aggregated MAC Protocol Data Unit) and A-MSDU (Aggregated MAC Service Data Unit), considering scenarios of video streaming. The objectives of this article are: (i) investigate the quality of service achieved, (ii) show which of the two methods of aggregation (A-MPDU or A-MSDU) is the more suitable for the application being considered and; (iii) suggest values for the parameters that result in better quality of service.

Joint Urgency Delay scheduler and adaptive aggregation technique in IEEE 802.11n networks

Abstract: The aggregation technique was defined by IEEE 802.11n, and used later by IEEE 802.11ac. This technique combines numerous packets into a single transmission. Hence, the throughput is improved since the overhead associated with each transmission is reduced. However, the delay is increased in the case of low rate application and large size of aggregated frame. In this paper, we propose new scheduling algorithm based on urgency delay and an adaptive frame aggregation technique to obtain an optimal trade-off between maximizing throughput and minimizing delay. Packets are scheduled based on Urgency Delay (UD) as well as Waiting Delay (WD). Packets having the lowest UD are firstly served to be included in the aggregated frame. Then, the payload size of aggregated frame will be adjusted based on the same metric of the first sub-frame. Simulation results prove that the serving delay and packet loss are widely reduced, and the average throughput is improved.

Improvement of bit error rate using channel interleaving for channel binding WLAN prototype

Abstract: High speed wireless LAN prototype of 324 Mbit/sec has been developed. Six channel binding of 802.11 a signal on frequency domain was employed for increasing PHY data rate. Frame aggregation was employed to improve MAC-SAP throughput. Individual adaptive data rate setting on each channel, so called adaptive dynamic channel assign was implemented in order to achieve maximum MAC-SAP throughput at any channel condition. In this paper, multiple channel interleaving over all frequency channels for randomization of burst error was presented. Interleaving can be carried out over all channels or inside individual channel. Bit and packet error rate were measured using implemented WLAN equipements with/without multiple channel interleaving. It was confirmed that improvement using multiple channel interleaving were measured to be 2 dB.