QoE Enhancements in IEEE 802.11e EDCA for Video Transmission through Selective Queueing (original) (raw)
Related papers
Evaluation of QoS Support for Multimedia Traffics in IEEE 802.11e
2006 International Conference on Software in Telecommunications and Computer Networks, 2006
The efficient delivery of multimedia over wireless LANs is strongly dependent on the requirements imposed by different traffics contending the channel resources. Mechanisms for supporting QoS are needed, especially when voice and video applications come into play with stringent constraints in terms of delay and throughput. In this paper we evaluate, through simulations, the benefits derived from the adoption of the IEEE 802.11e standard in delivering multimedia over WLANs. The adoption of fine-tuned parameters regulating the EDCA MAC scheme permits to achieve high performance in terms of goodput and delay, allowing multimedia traffics to fully satisfy their QoS requirements. Realistic assumptions have been made in our simulations, by taking into account the shadowing effects, typical of closed environments, and by adopting suitable parameters to simulate 802.11e channels as exactly as possible.
International Journal of Communication Systems, 2020
Hybrid coordination function controlled channel access (HCCA) is a medium to enhance quality of service (QoS) via the IEEE 802.11e standard. The main limitation of HCAA is that it is only efficient for constant bit rate (CBR) applications. This is due to the nature of its scheduler that allocates transmission opportunities (TXOPs) based on traffic stream (TS) specifications (TSPECs) that are determined during the traffic setup time. Variable bit rate (VBR) traffics used in HCCA have nondeterministic profile, making it not optimally and efficiently supported by HCCA. The result of this inefficiency is a deterioration of the transmission performance of multimedia data as well as a drop in the number of served QoS video traffics. We propose a novel approach to deal with this issue, which is the feedback-based admission control unit (FACU). FACU works by optimizing the usage of extra bandwidth to ensure optimal transmission performance of multimedia data. FACU achieves this by exploiting piggybacked information concerning sequential video frames in order to accurately assign the TXOP. The proposed approach is evaluated by utilizing various video sequences. It is demonstrated that FACU maximizes the overall number of video streams and optimizes the overall usage of the network without having any adverse effects on the QoS constraints determined.
Performance Analysis of Video Transmission Over IEEE 802.11a/e WLANs
IEEE Transactions on Vehicular Technology, 2007
This paper presents efficient mechanisms for delaysensitive transmission of video over IEEE 802.11a/e Wireless Local Area Networks (WLANs). Transmitting video over WLANs in real time is very challenging due to the time-varying wireless channel and video content characteristics. This paper provides a comprehensive view of how to adapt the quality of service signaling, IEEE 802.11e parameters and cross-layer design to optimize the video quality at the receiver. We propose an integrated system view of admission control and scheduling for both contention and poll-based access of IEEE 802.11e Medium Access Control (MAC) protocol and outline the merits of each approach for video transmission. We also show the benefits of using a cross-layer optimization by sharing the Application, MAC, and Physical layer parameters of the Open Systems Interconnection stack to enhance the video quality. We will show through analysis and simulation that controlling the contention-based access in IEEE 802.11e is simple to realize in real products and how different cross-layer strategies used in poll-based access lead to a larger number of stations being simultaneously admitted and/or a higher video quality for the admitted stations. Finally, we introduce a new concept called time fairness, which is critical in enhancing the video performance when different transmitter-receiver pairs deploy different cross-layer strategies.
An On-Off Queue Control Mechanism for Scalable Video Streaming over the IEEE 802.11e WLAN
2008 IEEE International Conference on Communications, 2008
In this paper, we study the issue of scalable video streaming over IEEE 802.11e EDCA WLANs. Our basic idea is to control the number of "active" nodes on the channel in order to reduce collisions under heavy traffic conditions. Specifically, we propose a distributed on-off queue control (OOQC) mechanism, which is designed to maintain high network throughput while keeping packet loss due to collision as low as possible. A low priority early drop (LPED) method is also employed to drop the packets at the queue according to packet relative priority index (RPI) provided by scalable video coding. Simulation results show that our proposed OOQC scheme significantly outperforms EDCA in received video quality. This full text paper was peer reviewed at the direction of IEEE Communications Society subject matter experts for publication in the ICC 2008 proceedings.
QoS Enhancements for Video Transmission over High Throughput WLAN: A Survey
Providing the need of wireless infrastructure IEEE 802.11 WLAN standards are widely used to satisfy the multimedia application over wireless technologies. Delivery of video with increasing saturated traffic over legacy WLAN standards dissembles the performance by being not compatible with the resources. Aiming to this high throughput standard has developed known as IEEE 802.11n with ideal data rate upto 600 Mbps. However the delivery of the video stream over IEEE 802.11n standard is a challenging task due to scalable video properties and adaptive network resources. In this survey, we present a brief survey of scalable video coding standards and MAC enhancements introduced by the new WLAN standards. Peculiarly we focus on the MAC layer enhancements and recent innovation to boost up the video transmission. Namely we investigate EDCA scheduling and aggregation scheme on video transmission. Finally we conclude with the various authors' recent innovative ideas with their advancements and restriction.
Wireless Local Area Networks (WLANs) supporting modern streaming multimedia applications constitute a very challenging and rapidly changing field of research. Towards implementing effective multimedia wireless networks, the IEEE has published the "state of the art" IEEE 802.11e standard, which introduced a QoS-aware MAC-layer along with a series of efficiency enhancements. However, it has been proven inadequate in handling multimedia traffic optimally in periods of congestion. For the efficient support of multimedia applications in high load situations, numerous mechanisms have emerged, most of them focusing on altering the static nature of resource allocation specified in IEEE 802.11e. Nevertheless, traffic characteristics must be taken into consideration in order to achieve the highest gains. In this paper, an application-aware MAC-layer mechanism is developed that exploits multimedia frame semantics and existing MAC-layer enhancements to adequately cope with high congestion situations in IEEE 802.11e infrastructure networks. The proposed algorithm makes use of existing acknowledgment policies and adaptive resource allocation techniques depending on multimedia frame significance. The effectiveness of the algorithm is proven by means of simulations, where its functionality is evaluated and compared with other existing schemes.
ArXiv, 2021
This paper presents an analytical model for the average frame transmission delay and the jitter for the different Access Categories (ACs) of the IEEE 802.11e Enhanced Distributed Channel Access (EDCA) mechanism. Following are the salient features of our model. As defined by the standard we consider (1) the virtual collisions among different ACs inside each EDCA station in addition to external collisions. (2) the effect of priority parameters, such as minimum and maximum values of Contention Window (CW) sizes, Arbitration Inter Frame Space (AIFS). (3) the role of Transmission Opportunity (TXOP) of different ACs. (4) the finite number of retrials a packet experiences before being dropped. Our model and analytical results provide an in depth understanding of the EDCA mechanism and the effect of Quality of Service (QoS) parameters in performance of IEEE 802.11e protocol.
Performance analysis and throughput optimization of the 802.11N EDCA for video traffic
Journal of Information and Optimization Sciences, 2017
One of the promising candidate access technology for wireless communication in present and the future scenario is based on IEEE 802.11 Wireless LAN (WLAN) standard. The popularity of WLAN is further driven by the ability to use portable mobile hand-held devices that support applications with increasing multimedia content.This study presented on analysis of throughput performance and average delay of video traf fic over wireless EDCA WLAN networks by aggregation effect using the simulation methodology. In this study, the effect of frame aggregation (FA) mechanism for H.264/SVC video traffic on throughput and average delay of IEEE802.11n have been investigated. Simulation results validate the efficiency of the suggested MAC aggregation mechanism and aggregation sizes are adapted to achieve throughput optimization. Result shows significant improvement between measurement defined by the draft of IEEE802.11n and the proposed methodology.
Implementation Issues for a Video Streaming Server in Ieee 802.11 e Wlans
Recent years have seen a proliferation of real-time multimedia traffic over a more and more heterogeneous Internet. Video streaming at high, consistent quality over wireless links proves to be a difficult task. Several optimization techniques have been proposed and studied, mostly through theoretical analysis and simulation. This article describes the implementation of a cross-layer H.264 video streaming server and the evaluation of its performance in IEEE 802.11e WLANs. Measurements present the benefits of employing several key cross-layer mechanisms which aim to improve the video transmission quality over wireless links. A cross-layer signaling solution is implemented, which addresses important QoS issues between user-space and the kernel traffic control and device driver components. Network support for efficient multiqueue transmission is enabled in the Linux network driver. In addition, the paper discusses the implementation of an enhanced scheduling scheme for the receive-side, in order to provide prioritization of video streams over elastic traffic, and also for better control of latency and improved throughput for multimedia flows.