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This paper proposes an adaptive packet aggregation scheme with QoS awareness in CR (Cognitive Radio) enabled Mobile Ad Hoc Networks (CRMANET). Instead of directly introducing the aggregation scheme from the 802.11n standard into CRMANET, the proposed adaptive scheme inherits the design advantages from the work given in [1] in regard to packet scheduling to further utilize each sub-channel before every...
To improve the throughput of wireless networks and support real-time multimedia applications in multi-radio multi-channel wireless mesh networks, we use the cross-layer design to develop a solution for the joint channel assignment and QoS routing problem. In this paper, we propose the channel assignment keeping the topology connectivity and present a QoS routing algorithm which selects from candidate...
Most previous work in CR relay networks concentrates on maximizing physical layer QoS (e.g., capacity, spectral efficiency and achievable data rate) as relay selection criteria. However, the energy state of relay nodes is largely ignored, which has significant effects on the network lifetime. This paper proposes a distributed relay selection scheme for cooperative transmissions over underlay CR networks,...
Dynamic spectrum access has become a promising approach to fully utilize the scarce spectrum resources. In this paper, two new dynamic spectrum access schemes for secondary users are proposed, which are based on continuous-time Markov chains (CTMC). Both the interactions between primary and secondary users and the effects of imperfect spectrum sensing(i.e. miss-detection and false alarm) are considered...
In IEEE 802.16e OFDMA system, the system capacity for accommodating VoIP traffic with small-sized PDUs is severely reduced due to a large amount of signalling overhead. In order to mitigate this problem, the IEEE 802.16 maintenance group has recently proposed a persistent allocation scheme to increase the voice over IP (VoIP) system capacity. However, it is difficult to use the conventional modulation...
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