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During past decades, the classroom scheduling problem has posed significant challenges to educational programmers and teaching secretaries. In order to alleviate the burden of the programmers, this paper presents SmartClass, which allows the programmers to solve this problem using web services. By introducing service-oriented architecture (SOA), SmartClass is able to provide classroom scheduling services...
With the explosive growth of smart devices and mobile data traffic, limited fronthaul capacity has become a notable bottleneck of green communication access networks, such as cloud radio access networks(C-RANs). In this paper, we proposed a joint user association and downlink beamforming scheme for green C-RANs to minimize the network power consumption with the limited fronthaul links. We first formulate...
Sparse code multiple access (SCMA) is a non- orthogonal multiple access scheme, which has been considered as one of the key 5G technologies to improve spectral efficiency. Moreover, device-to- device (D2D) communication is introduced as a vital technology component for 5G cellular communication system to improve spectral reuse. D2D communication combined with SCMA will be a significant part of 5G...
Configuring uplink-downlink frame structure has played an important role in TD-LTE Heterogeneous Cellular Networks (HCNs), but how to dynamically choose the specific TD-LTE frame structure under the densely deployed scenarios has not been well investigated. In this paper, we proposed a novel dynamic frame configuration scheme which could resolve the above problem with low complexity. Specifically,...
This paper discusses the problem of minimizing the energy used to transmit packets over a memoryless channel, with a constraint on the delay suffered by packets and a constraint on peak transmitter power. The problem is studied within discontinuous reception (DRX) supported system. Specifically, we seek a DRX-compatible transmission policy that can solve the problem without the knowledge of fading...
In order to fully utilize spectrum, auction-based dynamic spectrum access has become a promising approach which allows unlicensed wireless users to lease unused bands from spectrum license holders. Traditionally, the property of spectrum goes to a unique winner with the highest bid after the auction, and the bidders with low bids would be probably not served. This also may result in spectrum resource...
In most applications of wireless sensor network, the acquired information is useful only when their locations are known. Compared with ACT (alternating combination trilateration), IACT (improved alternating combination trilateration) has reduced its calculation overhead greatly. In IACT, The value of m, which determines how many triangles are used in calculations, is static. In this paper, the value...
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