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Watanabe Y.,Green Platform Research Laboratories | Sugahara H.,Green Platform Research Laboratories | Matsunaga Y.,NEC Corp | Hamabe K.,Green Platform Research Laboratories
IEEE Vehicular Technology Conference | Year: 2013

Mobility Robustness Optimization (MRO), i.e. self-optimization of handover (HO) parameters, is a key driver for expanding Heterogeneous Networks (HetNet) while suppressing the need for drive tests. 3GPP Long Term Evolution (LTE) has introduced a scheme for MRO that enables the eNB, i.e. a base station, to detect HO failures while coordinating with other eNBs via the X2-interface (X2-Intf). However, neighboring eNBs do not always have X2-Intf because of technical constraints. In this paper, we propose an inter-eNB coordination-free algorithm for MRO. The algorithm adjusts the Cell Individual Offset (CIO) on the basis of ping-pong HOs and HO failures that are detected by monitoring HO related signaling via interfaces other than X2-Intf. LTE HetNet simulations confirmed that the algorithm was resistant to the detection error of HO failures and its HO performance was comparable to that of an algorithm using X2-Intf. Moreover, the proposed algorithm reduced the total number of HO failures from pico cells by 33% while keeping the ping-pong HO rate at an acceptable level, even with quasi-optimal default settings. The HO performance from the macro cells always had good quality, irrespective of whether the proposed algorithm was used or not. © 2013 IEEE.


Sasaki Y.,Green Platform Research Laboratories | Takahashi M.,Green Platform Research Laboratories | Aimoto T.,NEC Corp | Genshin A.,Green Platform Research Laboratories
NEC Technical Journal | Year: 2012

The NEC Group has developed a piezoelectric vibration sensor that features sensitivity at about 20 times that of previous models. A vibration sensor is a device that corresponds to the auditory and tactile organs of the human body. The real world is flooded with vibration information generated by humans, goods and environments. Our recently developed vibration sensor can collect minute waveform data that has been hitherto undetectable and has therefore not been utilized. The device extracts the frequency components that present anomalies and analyzes their significance by means of cloud computing, so as to implement a safe and secure society by connecting accurate identification of situations and circumstances for the prevention of adverse events. This paper introduces features of the newly developed vibration sensor and discusses efforts being made for the development of its applications.


Saito N.,Medical Solutions Division | Takahashi Y.,Medical Solutions Division | Kozaki M.,Medical Solutions Division | Kuwahara K.,Global Products and Services Development Division | Kubo M.,Green Platform Research Laboratories
NEC Technical Journal | Year: 2015

As Japan is facing a hyper-aged society, Personal Health Records (PHRs), which patients collect and manage their own healthcare information, is currently attracting attention. NEC is advancing R&D to collect "symptom data," "drug adherence data" and "continuously monitored blood pressure data" by directly and objectively accessing the source which are hard to gather sufficiently. With this technology, NEC will contribute to a reduction in the wasteful medical expenses caused by forgetting to take medicines, to the new drug development earlier with quality improvement of clinical trials, and to support higher accurate diagnoses and better medical care.


Toyao H.,Green Platform Research Laboratories | Hankui E.,Green Platform Research Laboratories | Kobayashi H.,NEC Access Technica Ltd. | Ando T.,NEC Access Technica Ltd.
NEC Technical Journal | Year: 2014

The rapid size reduction of wireless equipment has led to a drop in the communication performance caused by the electromagnetic noise that is generated inside the equipment becoming an important issue. The electromagnetic bandgap (EBG) structure that is a kind of metamaterial is attracting attention as a new technology for reducing electromagnetic noise. This paper introduces a newly developed EBG structure, which is a technology developed originally by NEC. Wi-Fi home router products that apply this structure as a world first technology are also discussed.


Morita M.,Green Platform Research Laboratories | Nobukiyo T.,Green Platform Research Laboratories | Hamabe K.,Green Platform Research Laboratories
NEC Technical Journal | Year: 2013

Demand is accelerating for reliability that mobile communications services can be used in a stable way. In order to cope with the increasing data traffic volume of mobile communications, there is a growing need to install more femtocell base stations covering small indoor areas, in addition to macrocell base stations covering large outdoor areas. This paper introduces a technology to maximize communications speeds by controlling the transmission power of radio signals for femtocell base stations in accordance with the data traffic volume. This is a radio signal interference control technology that minimizes the degradation of communications quality, which happens due to radio signal interference with macrocell base stations, even under the condition of a high-density installation of femtocell base stations. Moreover, we introduce a technology that makes it possible to control transmission power for each femtocell base station and to minimize the radio signal influence of heavy users who carry out high-volume data transmission.


Ishizaka K.,Green Platform Research Laboratories | Takenaka T.,Green Platform Research Laboratories | Moriyoshi T.,Green Platform Research Laboratories
NEC Technical Journal | Year: 2015

As cloud platforms are increasingly required to support social infrastructure services and data crunching, they need to be able to analyze large amounts of data collected from the real world, such as movies, images, audio, and sensor data at high speed and with low latency, and then feed the results back to the real world in a timely manner. Conventionally, distributed processing is performed using a large number of general-purpose servers, but there is a problem with this solution - equipment costs, power consumption, and space requirements simply become too great. In this paper, we discuss accelerator utilization technology that makes it possible to process and analyze massive volumes of data in the cloud computing, while actually lowering costs, reducing power consumption, and minimizing the platform footprint. We will also be introducing proposals for future developments in this area. © 2015, NEC Mediaproducts. All rights reserved.


Kumura T.,Green Platform Research Laboratories | Suzuki N.,Green Platform Research Laboratories | Takahashi M.,Green Platform Research Laboratories | Tominaga S.,Green Platform Research Laboratories | And 2 more authors.
NEC Technical Journal | Year: 2015

The increasing demand for water arising from global population growth and urbanization in recent years is stressing the water supply to its limits. On the other hand, water infrastructure such as pipes has been deteriorating due to aging. Under these conditions, new technologies in the water infrastructure have been required to enable the distribution of high quality water to users in a safe and cost-effective manner, from the perspective of efficiently using our world's precious water resources. The NEC Group is collaborating with Imperial College London to develop a Smart Water Management System based on ICT to operate the water infrastructure more efficiently. This article introduces our efforts.


Yoshikawa T.,Green Platform Research Laboratories | Kan M.,Green Platform Research Laboratories | Takahashi M.,Green Platform Research Laboratories | Miyakawa S.,Green Platform Research Laboratories | And 2 more authors.
NEC Technical Journal | Year: 2015

As usage of the cloud expands, cloud data centers will need to be able to accommodate a wide range of services including not only office applications but also on-premises services and in the future, the Internet of Things (IoT). To meet these needs, it requires the ability to simultaneously handle multiple demands for data storage, networks, numerical analysis, and image processing from various users This paper introduces a Resource Disaggregated Platform that will make it possible to perform computation by allocating devices from a resource pool at the device level and to scale up individual performance and functionality. By using standard conventional hardware and software resources to build these disaggregated computer systems, it is possible to deliver faster, more powerful, and more reliable computing solutions effectively that will meet growing customer demand for performance and flexibility. © 2015, NEC Mediaproducts. All rights reserved.


Nakata Y.,Broadcast and Media Division | Chono K.,Information and Media Processing Laboratories | Moriyoshi T.,Green Platform Research Laboratories | Shimofure K.,Broadcast and Media Division | And 2 more authors.
NEC Technical Journal | Year: 2015

Advances in image recording/playback device technologies have made it possible to provide next-generation broadcasting services that deliver ultra high definition video that surpasses terrestrial HD (High Definition) broadcasts. The ultra high definition digital video of 4K comprises a pixel count that is 8 times higher than HD, enabling it to convey a scene's depth and presence more effectively to the viewer. However, since the amount of image data that must be processed is enormous, a highly efficient digital video compression technology becomes necessary for image transfer. And since the ultra high definition digital video will be used for sports and other live broadcasts as well, real-time compression is a necessity. In this paper we discuss NEC's ultra high definition digital video compression technology and real-time HEVC compression unit corresponding to 4K, as well as our future activities.

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