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Mobile WiMAX can provide high-speed wireless access to mobile users. It also supports applications and services with diverse QoS (Quality of Service) requirements. However, it does not guarantee media quality for multimedia streaming services using scalable video coding schemes, because it does not consider essential characteristics of video coding techniques and network congestion. To solve this...
Users using the same video streaming service within a wireless network share the same limited backbone bandwidth to the Internet. These users are motivated to collaborate with each other to obtain better-quality service. The decisions and actions of users influence the performance of others, hence they form a social network. In a fully-distributed wireless network, malicious attack can cause much...
Recently, due to the prevalence of various mobile devices and broadband wireless networks, there has been a significant increase in interest and demand for multimedia streaming services such as the mobile IPTV. In order to deploy a mobile IPTV service in wireless broadband networks, offering users efficient wireless resource utilization and seamlessly offering Quality of Experience (QoE) are important...
In this paper, we propose an adaptive cross layer technique that optimally enhance the QoS of wireless video transmission in an IEEE 802.11e WLAN. The optimization takes into account the unequal error protection characteristics of video streaming, the IEEE 802.11e EDCA parameters and the lossy nature of wireless channel. Our proposed technique makes use of two analytical models: a video distortion...
The communication of video streams over wireless not only requires the stability of channel but also needs stringent QoS (quality-of-service) constraints, such as low packet loss and latency. Therefore, radio resource allocation for different traffic becomes one of the major challenges in designing a wireless multimedia network. In this paper, a priority-based cross-layer QoS scheme for wireless channel...
This paper proposed an adaptive scheduling algorithm for real-time video streams in wireless local area networks (WLAN). The first job is how to reduce the amount of the video data that must be transmitted on the wireless channel. The second job is how to scheduling the video streams at the access point (AP) and achieving the best overall quality of service (QoS). For the first job, we will compare...
802.11e HCCA (Hybrid coordination function Controlled Channel Access) exhibits good QoS provisioning for constant bit rate (CBR) video streams in a single collision domain. However, its performance degrades significantly for variable bit rate (VBR) video streams particularly in multi-collision domains. In addition, HCCA has the disadvantage of high complexity. In this paper, we introduce a deterministic...
In recent years, the rapid development of wireless communication allows us to enjoy more multimedia services via wireless network. However, due to lack of QoS support and characteristics of wireless channel, there are still many challenges in wireless video streaming. In this paper, we implement a cross-layer architecture to enhance the QoS transmission of h.264/AVC video stream in IEEE 802.11e wireless...
This paper addresses the issue of buffer underflow in wireless multimedia service, due to both the unreliable and time-varying nature of the wireless channel. Specifically, we propose a statistical model to estimate the buffer underflow time. Based on the estimation of the underflow time, a scene-aware adaptive playout algorithm with dual-threshold to adjust the frame rate is presented. This approach...
Ultra-wideband (UWB) is a new wireless technology that transfers data over shorter distances with higher data rates and lower transmission power. WiMedia Alliance's Media Access Control (MAC) protocols for UWB-based wireless personal area networks have become an international standard. The Distributed Reservation Protocol (DRP) is part of this standard that reserves the wireless channel on a slot-by-slot...
This paper introduces P2P communication across a VANET and seeks to establish under what conditions (mobility, network size, wireless channel) data streaming is feasible. Routing of streamed services over multiple hops and multiple paths may result in significant packet losses, resulting in unacceptable quality of service. This paper examines the impact of differing traffic densities and different...
Technological advances allow handheld devices to be equipped with faster processors and wireless interfaces, making the performance comparable to laptop Computers. In this paper, we describe real-time video streaming over heterogeneous networks namely Bluetooth, Wi-Fi and GPRS-EDGE. The wireless channel used for communication in different network varies in their Bandwidth, supported Bit rate and Unequal...
Raising the quality of the streaming service in wireless networks has been the focus of intensive research over the years. Instable wireless channel conditions cause frequent transmission delays and packet losses due to fading and interference. Therefore, this situation leads to the degraded quality of video streaming service. The IEEE 802.11 Working Group is currently working on a new standard called...
Streaming services on wireless network is being popular since the bandwidth and QoS on wireless network has been improved. However, the dynamic fluctuated bandwidth, higher error rate and sharp delay jitter on wireless channel cause trouble to the real-time demand of streaming services. The wireless streaming media system aims at mobile users must also consider the large scale number of the potential...
Cross-layer design has been used in streaming video over the wireless channels to optimize the overall system performance. In this paper we extend our previous work (i.e. joint design of source rate control and congestion control for video streaming over the Internet) in P.Zhu et al., (2005) and propose a cross-layer design approach for wireless video streaming. By jointly designing the source rate...
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