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In-home networking based on Wireless LAN (WLAN) or Power Line Communication (PLC) provides convenience and mobility to the users because in both technologies there is no need to rewire a house. However, both PLC and WLAN suffer from different performance degradation problems due to their different communication media. This paper provides a cooperative transmission scheme between PLC and WLAN, which...
Media broadcasting services using Internet protocol (IP) multicast are emerging and IEEE 802.11 wireless LAN (WLAN) has been widely deployed. Therefore, the opportunities to receive multicast streaming over WLAN are expected to grow. However, because of restrictions on the IEEE 802.11 standard, the transmission rate and the reliability of multicast over WLAN are lower than those of unicast. In this...
The present paper is motivated by the question how we can quickly transfer large-sized file if multiple (heterogeneous) networks are available but each of which has quite insufficient performance for the requested task. We propose a research framework for large-sized data transfer by integrating multiple and heterogeneous challenged access networks, in which long delays, leaks (heavy packet losses),...
We consider the problem of joint network coding and packet scheduling for multimedia transmission from the Access Point (AP) to multiple receivers in 802.11 networks. The state of receivers is described by a hidden Markov model and the AP acts as a decision maker which employs a partially observable Markov decision process (POMDP) to optimize the media transmission. Importantly, we introduce a simulation-based...
We propose QUEST (QUality ESTimation), a new method that accurately estimates IEEE 802.11 wireless link quality with no in-band signaling overhead. Existing link quality estimation methods either are based on hello exchanges by fixing or varying transmission rates or rely on the history (e.g., delivery ratio) of previously sent data packets in a per-rate/-neighbor manner. QUEST on the other hand,...
We report the design, implementation and evaluation of Merged Hybrid ARQ with staggered FEC (MHARQ) system for video multicast over wireless LANs. MHARQ combines the advantages of receiver-driven staggered FEC and hybrid ARQ schemes to compensate the large dynamic range of WLAN channels and to achieve high reliability, scalability and wireless bandwidth efficiency for video multicast. The FEC packets...
It is well known that a packet loss in 802.11 can happen either due to collision or an insufficiently strong signal. However, discerning the exact cause of a packet loss, once it occurs, is known to be quite difficult. In this paper we take a fresh look at this problem of wireless packet loss diagnosis for 802.11-based communication and propose a promising technique called COLLIE. COLLIE performs...
This contribution addresses the case when live packet-switched video is used to enrich circuit-switched speech calls in mobile telephony. Circuit-switched and packet-switched transmissions generally operate on completely different transmission paths resulting in different QoS in terms of delay and loss rates. In this case, video and audio data recorded at the same time are not multiplexed together...
With recent improvements in physical layer (PHY) techniques, the achievable capacity for wireless LANs (WLANs) has grown significantly. However, the overhead of IEEE 802.11 MAC layer has limited the actual throughput of a WLAN. A-MPDU aggregation suggested in IEEE 802.11n draft is a key enhancement reducing the protocol timing overheads that enables aggregation of several MAC-level protocol data units...
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