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In this paper, w investigate the achievable throughput of cognitive radio ad hoc networks. The current research on throughput evaluations focus on the average value over spatial distribution of random nodes. However, these average models neglect performance discrepancies resulting from different spatial nodes. In order to overcome this limitation, we derive the achievable rate coverage probability...
A simplified layered scheduling scheme is presented, which is based on utility-based scheduling, such as Max-Delay- Utility (MDU) scheduling in this paper. In this scheme, the scheduling is divided into two steps-- macro and micro scheduling. In macro step, the utility functions of traffics are defined, according to which the scheduling order of various services is determined. Then in micro step,...
A cross-layer scheduling mechanism with opportunistic consideration is proposed for the multi-service cooperative transmission networks, in which the multiple idle nodes act as relays to facilitate the active link communication. In the proposed scheme, the scheduler in the MAC layer of the access point not only exploits the multi-user diversity based on the channel condition feedback from each node,...
A novel hierarchy scheduling mechanism is proposed for opportunistic scheduling in multi-service OFDMA network, where the services consist of delay-sensitive (DS) services and delay-insensitive (DIS) services. To implement opportunistic scheduling (OS), we design a hybrid QoS mechanism based on the channel condition feedback from each Mobile Station. In the MAC layer, scheduler performs hierarchically...
In future wireless communications, there will be a mixture of different traffic classes, which have their own load and quality-of-service (QoS) requirements. In this paper, a traffic load and QoS-oriented packet scheduling (TLQS) is proposed for WCDMA communications, which consider the bit error rate (BER), packet loss, delay and traffic load requirements. The BER requirement can be guaranteed by...
Wireless personal area network (WPAN) has been deemed one promising networking technique since diverse applications will be applicable in an ad hoc fashion in WPANs such as Bluetooth. Ultra wide band (UWB) has also become one hot research field because of its capability of supporting high-rate short-distance communications, and UWB-based WPAN has been receiving more and more research efforts recently...
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