Fujitsu Laboratories Ltd. and Fujitsu Laboratories of America, Inc. today announced development of technology that automatically reduces radio wave interference by detecting the environment around a femtocell to enable high-speed, high-quality indoor wireless communications.
Until now, when one femtocell was near either another femtocell or an outdoor macrocell base station, radio wave interference would distort communication signals. Fujitsu has now developed technology that enables the femtocell to detect its surroundings and automatically adjust the timing, transmission power, and transmission frequency band to reduce radio wave interference. In simulations, it was confirmed that this technology approximately doubles communication speeds in cases where there is significant radio wave interference, as compared to previous technology.
In home wireless environments, this technology will enable high-resolution video streams and allow applications such as online games to run smoothly.
Details of this technology will be presented at the 24th Annual IEEE International Symposium on Personal, Indoor and Mobile Radio Communications (PIMRC2013), opening in London on September 8, 2013.
In this case, the communications speed of a device connected to a femtocell is reduced because of radio waves from another nearby femtocell.
In this case, the communications speed of an indoor femtocell connected device is reduced because of radio waves from a nearby macrocell base station.
In this case, the communications speed of a device connected to a faraway macrocell base station is reduced because of radio waves from a nearby femtocell.
Fujitsu developed technology that enables the femtocell to detect its surroundings and automatically adjust the timing, transmission power, and transmission frequency band of its communications to reduce all three types of radio wave interference. Specifically, it manages interference through the sequence described below.
The femtocell collects information on devices connected to it, surrounding macrocell base stations, macro base station connected devices, and other nearby femtocells.
Based on the information on surrounding macrocell base stations, the timing of the femtocell's signal transmissions are set in accordance with the timing of the signal transmissions of the surrounding macrocell base stations. As a result, interference in control channels and data channels are separated so as to diminish control channel interference.
Based on the information about the devices that are connected to it, when communications quality is compromised the femtocell can increase the transmission power of the control channels in order to maintain control channel quality. This stabilizes the device connections.
Based on information from nearby femtocells and macro devices connected to nearby macrocell base stations, the frequency band of the data channels is segmented to avoid interference from other femtocells or macrocell base stations. This raises data channel quality and increases communications speeds.
In simulations, it was confirmed that, compared to before, this technology approximately doubles communication transmission speeds in cases where there is significant radio wave interference. It was also confirmed that communications became possible with macro devices that previously could not work properly due to severe interference.
Although femtocells cannot be subject to meticulously predetermined positioning requirements or parameter adjustments, a femtocell with this technology significantly improves indoor communication speeds and prevents them from adversely affecting other nearby outdoor mobile users. Accordingly, in home wireless environments, this technology enables high-resolution video streams and also allows applications such as online games to run smoothly.
Fujitsu will proceed with verification testing of the features and functions of this interference control technology with the aim of actual implementation in fiscal 2013.
 BroadOne LTE Femtocell
See "Fujitsu Releases BroadOne LTE Femtocell for Easy Indoor Wireless Communications" (press release dated January 6, 2012).
Founded in 1968 as a wholly owned subsidiary of Fujitsu Limited, Fujitsu Laboratories Limited is one of the premier research centers in the world. With a global network of laboratories in Japan, China, the United States and Europe, the organization conducts a wide range of basic and applied research in the areas of Next-generation Services, Computer Servers, Networks, Electronic Devices and Advanced Materials. For more information, please see: http://jp.fujitsu.com/labs/en.
Fujitsu Laboratories of America, Inc. is a wholly owned subsidiary of Fujitsu Laboratories Ltd. (Japan), focusing on research on Internet, interconnect technologies, software development and solutions for several industry verticals. Conducting research in an open environment, it contributes to the global research community and the IT industry. It is headquartered in Sunnyvale, CA. For more information, please see: www.fla.fujitsu.com
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All company or product names mentioned herein are trademarks or registered trademarks of their respective owners. Information provided in this press release is accurate at time of publication and is subject to change without advance notice.
Date: 10 September, 2013
City: Kawasaki, Japan, and Sunnyvale, CA
Company: Fujitsu Laboratories Ltd.
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