Current Issue : April - June Volume : 2018 Issue Number : 2 Articles : 5 Articles
Improving customer-perceived service quality is a critical mission of telecommunication service providers. Using 35 billion call\nrecords, we develop a call quality score model to predict customer complaint calls. The score model consists of two components:\nservice quality score and connectivity score models. It also incorporates human psychological impacts such as the peak and end\neffects. We implement a large-sized data processing system that manages real-time service logs to generate quality scores at the\ncustomer level using big data processing technology and analysis techniques. The experimental results confirm the validity of the\ndeveloped model in distinguishing probable complaint callers.With the adoption of the system, the first call resolution rate of the\ncall center increased from 45% to 73%, and the field engineer dispatch rate from 46% to 25%....
Remote areas with sparse population, disaster areas in the aftermath, and refugee\ncamps all require communication that is not forthcoming from commercial vendors. Numerous\ncommunication system options are available, but with widely varying cost and efficacy. The goal\nof this work is to discuss a framework in which to consider appropriate telecommunications\ntechnology. The framework approaches sustainable development as a business, under the\nassumption that social/technical/environmental sustainability requires economic sustainability.\nThe framework incorporates well known and accepted business canvas as a roadmap. Information\nand Communication Technology (ICT) interventions are then considered in terms of their value\nproposition, markets, and perhaps most important for the realm of sustainable development, the key\npartners. To illustrate how the framework applies, we consider three case studies and then apply the\nresultant principles to the consideration of these ICT projects. The case studies are chosen for their\ndiversity. Furthermore, after verifying the decision framework, recommendations are made for three\nongoing intervention projects in limited-resource settings....
TO-DCF, a new backoff scheme for 802.11, has\nthe potential to significantly increase throughput in dense\nwireless LANs while also opportunistically favouring nodes\nwith heavier traffic loads and/or better channel conditions.\nIn this paper we present an analytical model to investigate\nthe behaviour and performance of the TO-DCF protocol\nwith regards to operating parameters such as the number\nof nodes, the contention window size and the backoff\ncountdown probabilities.We then compare numerical results\nfrom an implementation of our model with simulations. Our\nmodel shows a high level of accuracy, even when the model\nassumptions are relaxed, and provides guidance for network\noperators to correctly configure the weight functions for\nnodes running TO-DCF given the network�s operating conditions....
The universal filtered multicarrier (UFMC) is an appealing technique to eliminate out-of-band emission (OOBE) for\nfifth-generation (5G) networks. However, its signals that are modulated to the carriers, which are on the edges of one\nsubband, are influenced by the filter. In this paper, an interference cancelation scheme is proposed to suppress the\ninterference and to improve the multiuser system performance. Here, interference cancelation subcarriers are inserted\non the edges to reduce the filter interference. This scheme ensures that the operating subregion or subband supports\nthe variable bandwidth allocation to meet the requirements of 5G networks. Simulation results show that the bit error\nrate (BER) performance improves by 4 and 7 dB compared with that of the conventional UFMC when the\ncorresponding Eb/N0 is 15 and 20 dB. Comparisons with both the standard OFDM and the GB OFDM are also\nreported. The results demonstrate that the proposed UFMC scheme outperforms the other two systems, especially\ncompared with the GB OFDM system under the condition of the same spectral efficiency....
Fourth-Generation (4G) mobile networks are based on Long-Term Evolution (LTE) technologies and are being deployed\nworldwide, while research on further evolution towards the Fifth Generation (5G) has been recently initiated. 5G will be featured\nwith advanced network infrastructure sharing capabilities among different operators.Therefore, an open-source implementation\nof 4G/5G networks with this capability is crucial to enable early research in this area. The main contribution of this paper is the\ndesign and implementation of such a 4G/5G open-source testbed to investigate multioperator infrastructure sharing capabilities\nexecuted in virtual architectures. The proposed design and implementation enable the virtualization and sharing of some of the\ncomponents of the LTE architecture.Atestbed has been implemented and validatedwith intensiveempirical experiments conducted\nto validate the suitability of virtualizing LTE components in virtual infrastructures (i.e., infrastructures with multitenancy sharing\ncapabilities). The impact of the proposed technologies can lead to significant saving of both capital and operational costs formobile\ntelecommunication operators....
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