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Virtual basestation (vBS) live migration is an enabling technology for reducing the power consumption of the baseband unit (BBU) pool of the cloud radio access network (Cloud RAN). Our previous work shows that using the existing virtual machine live migration solutions for vBS migration will introduce a service interruption time of several seconds, which is unacceptable for real-time services carried...
The emerging eTextbooks have attracted a lot of research, but the functions of eTextbooks are still not clear for utilizing them in classroom. In this study, based on the findings from a three-round Delphi study, we explored the functions of eTextbooks in K-12 classes through a mixed-method design research of interview, questionnaire and lecture video coding in two primary schools. The results showed:...
In this study, an experiment has been conducted in two elementary schools with 9 teachers and 203 students involved to identify the potential issues when initiatively utilizing eTextbooks in 14 classes by using a mix-method design of lecture video coding, interviews and questionnaires. A research framework was proposed to examine the potential issues in terms of the technical issues, user experience...
We propose a capacity balancing beamforming technique for a multiple inputs and multiple outputs (MIMO) based cognitive radio (CR) network. The proposed algorithm is based on mean square error (MSE) duality and it is aimed at maximizing the worst case user capacity of multiple secondary users (SUs) by jointly designing their transceiver beamformers while ensuring the interference leakage to multiple...
Lesson-preparing is an important stage in the field of teaching activity. The aim of this paper was to explore the use of Eduwiki as a new effective collaborative lesson-preparing platform to support teachers' collaboration and teaching. Furthermore, to verify and explore how to integrate Eduwiki into teachers' daily lesson-preparing activities, a single-group post-test and interview were used in...
Interference nulling (IN) is a linear precoding tech-nique for downlink multiuser multiple-input multiple-output(MU-MIMO) systems. With perfect channel knowledge at the transmitter, IN eliminates other users' interference at each cell, thus improving the sum rate of the users in the system. To evaluate its suitability in a multicell setup, we have implemented the real-time system based on IN as well...
Multi-cell MIMO technique theoretically promises large improvement in spectral efficiency and fairness in cellular networks and is regarded as the key enabling technique for solving the troublesome issue of inter-cell interference. To evaluate its practical performance in the cellular network, we have implemented the real-time downlink multi-cell MIMO trial system operating over bandwidth of 20 MHz...
Lesson-preparing is an important stage in the teaching activity processes. This paper argues that collaborative lesson-preparing within Eduwiki environment is a new effective approach for teacherspsila collaboration and teaching. Further, the architecture of Eduwiki is effective in monitoring and recording processes of lesson-preparing. The paper also provides a case to show the mechanism of collaborative...
This paper describes a collaborative lesson-preparing platform, named Eduwiki, which supports a community of inservice teachers creating, sharing, and improving capacity of lesson-preparing. The main purpose of this study compares what method is good for lesson-preparing and explores what motivates or hinders teachers to do collaborative lesson-preparing. Findings suggest that compared with uploading...
Currently, many lesson-preparing systems, which simply emphasize web technology, do little consideration on the real needs of teaching. This paper argues that wiki may be an effective tool to reform present situation and proposes to develop an Eduwiki system which supports collaborative lesson-preparing activities. The main purpose of this study explores what motivates or hinders teachers to implement...
Wikis' simplicity and flexible nature have begun drawing the attention of teachers and educators, who realize that Wikis facilitate collaborative finding, building, and sharing of knowledge. Knowledge management can enable schools to evolve from bureaucracies forged during an industrial era to educational knowledge ecologies that are prepared to compete in a networked information-driven global society...
Lesson-preparing can be seen as the prerequisite that drives teachers teaching activities. However, many lesson-preparing platforms do little consideration on the real requirments of teaching. Although these systems support some aspects of lesson-preparing, they are still lack of some other important features of it, which can't fulfill the requirements of the new curriculum reform in China. This paper...
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