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Recently, cognitive wireless local area network over fiber (CWLANoF) is proposed as an improved architecture of the legacy infrastructure-based IEEE 802.11 WLAN Extended Service Sets (ESSs). This newly architecture combines radio over fiber (RoF) and cognitive radio technologies together in order to achieve centralized radio resource management and equal spectrum access through cooperative spectrum...
Large-scale multi-AP WLANs with a high density of users and access points (APs) have emerged widely in various hotspots, where intra-cell interference is detrimental to the performance of WLANs. In order to mitigate the interference, a new system called cognitive WLAN over Fiber is presented in recent years. In this paper, based on Hidden Markov Modeling (HMM) detector's spectrum detection for Primary...
In conventional WLANs, stations (STAs) select access points (APs) using the existing scheme based on the current quality of links. However, some novel improved architecture of WLANs is proposed with cognitive radio (CR) to negotiate spectrum usage, where the existing AP selection scheme might not be suitable for it. Thus in this paper, a new optimal AP Selection based on Restless Bandits (APSRB) scheme...
Large-scale multi-AP WMAPNs with a high density of users and access points (APs) have emerged widely in various hotspots, where inter-cell interference is detrimental to the performance of WLANs. In order to mitigate the interference, channel assignment scheme has been a major research topic in recent years. In this paper, based on Bianchi's throughput performance evaluation, we model a channel assignment...
The instable user behavior and the burst traffic usually induce low utilization of spectrum resource in single wireless network. This paper proposes a novel spectrum borrowing scheme which allows spectrum borrowing between heterogeneous wireless networks to more efficiently make use of limited radio resource. The proposed scheme is based on the model composed of TD-SCDMA (time division-synchronous...
As heterogeneous wireless networks are deployed and users need more flexible mobility services, there has been a lot of research work about interworking mechanism between widely deployed 3G network and rapidly boarded WLAN (wireless local area network). On the other side, TD-SCDMA (time division-synchronous code division multiple access), which combines all the advantage of the TDD (time-division...
The complementary characteristics of different wireless networks make it attractive to integrate a wide range of radio access technologies. Most of previous work on integrating heterogeneous wireless networks concentrates on network layer quality of service (QoS), such as blocking probability and utilization, as design criteria. However, from a user's point of view, application layer QoS, such as...
The network selection problem in next generation heterogeneous wireless networks is one of the key issues to integrate a wide range of radio access technologies. In most previous work, the network selection problem is modeled as a centralized system, without considering the distributed nature of heterogeneous wireless networks. In this paper, we propose a distributed network selection scheme in heterogeneous...
Due to the heterogeneity of radio access technology and service in the 4G heterogeneous wireless access networks, it has been a great challenge on radio resource management. This paper considers a bandwidth allocation approach for multiple services in fourth generation (4G) heterogeneous wireless access networks where a mobile with multi-homing capability will be able to simultaneously connect to...
Multi-source multimedia transmission is a popular approach in wireless peer-to-peer networks. Most previous related work concentrates on the protocols and network structures, and consequently ignores the multiple senders scheduling problem. In this paper, we present a distributed sender scheduling algorithm for multi-source transmission in wireless P2P networks, which can maximize the data rate and...
In this paper, we focus on the Markov model of IEEE 802.11 distributed coordination function with power saving mode. The throughput evaluation is based on the model, with the comparison with the simulation result for validation. Furthermore, we notice that after each beacon transmission, there're more stations in contention than usual. Excessive contention results in high collision probability and...
In IEEE 802.11 wireless LAN, after the transmission of each beacon frame, there will be a large number of stations in power saving mode (PS mode, PSM) trying to send power saving poll (PS-Poll) frames to contend the right to receive the buffered downlink packets. However, excessive contention results in higher collision probability, higher power consumption and lower throughput than usual. To solve...
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