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Due to the introduction of wireless relays, the performance of LTE-A system was enhanced. Meanwhile, more energy was expensed and more interference was brought in. This is because the frequency used by relays may be the same or adjacent with the other relays or base stations. And the more stations deployed in a cell, the more energy consumed. In this paper, we proposed a novel green quasi-dynamic...
Focusing on the high computational complexity of cooperative selection methods in LTE uplink channels, an improved user selection method is proposed in this paper. The selection method is based on the channel quality and signal-to-noise (SNR) of cooperative user. This method is mainly divided into the following two steps: firstly, the user with poor quality channel condition selects a user with better...
The energy consumption in communication networks has attracted increasing attentions. However, the survey shows that the network is still idle at some time due to the redundant deployment of networks and varying traffic requirements. Sleeping in the network is an efficient way to save energy since the network in idle state consumes almost 90% of that in busy state. Considering that a centralized sleeping...
Multicast transmission is known as an efficient mechanism for offering the same services for different terminals. However, the power consumption is surprisingly arisen due to terminals with the worst channel quality while maintaining the Quality of Service (QoS) and data decoding requirements. In order to address this problem, we examine the energy saving performance of an efficient algorithm called...
Reliable co-channel bidirectional transmission in wireless networks is moving towards reality by employing the emerging full-duplex (FD) technology. Enhanced by FD-capable nodes, a future wireless network can be made up merely with pairs of bidirectional communicating nodes where each pair occupies a block of orthogonal resource to avoid interference, referred to as pure-FD system. In this paper,...
The concept of cognitive radio (CR) is proposed to deal with the problem that the spectrum resource is almost used up but some licensed bands are under very low utilization at the same time. In CR networks, secondary users (SUs) are allowed to utilize the licensed spectrum bands by paying to the primary users (PUs) with the spectrum licenses. Besides, with the rapid development of wireless communications...
Cognitive radio technologies are commonly considered as an effective way to solve the problem that currently spectrum resource is almost used up. In this paper, by introducing the concept of small cells, we propose an optimal dynamic spectrum management scheme. To allocate the spare spectrum resources with the optimization objective, the system throughput, power consumption and the interference of...
Ever increasing demand of higher data rates is pushing Multiple-Input Multiple-Output (MIMO) systems into the ongoing standardization of future wireless systems, where this added spatial dimension will be predominantly employed for spatially multiplexed transmission. In order to make these systems practically realizable, low complexity efficient detection algorithms are eagerly sought, both by the...
This paper is based on the TTCN-3 terminal conformance test structure defined by ETSI (European Telecommunication Standards Institute). And a security module is provided for TD-LTE/TD-SCDMA inter-RAT test system which uses the test structure. The proposed security module realization mechanism can be applied to conformance test system implementation directly, consequently, this paper possesses quite...
Interference alignment (IA) is known to achieve the maximum degrees of freedom at high SNR in interference channels, however, the reliability of IA is little discussed in literature. We consider a scenario consisting of multiple antenna transmit-receive pairs and a MIMO relay helping managing the interference. The interference management is performed in two subsequent transmission phases. Firstly,...
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