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Wireless Grid

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Wireless Grid

"Wireless Grid" means a grid topology constructed by several radio devices, which enables further enhanced and diversified functions via its collaborative and complementary behaviors compared to a single radio device.

Wireless Grid is considered one of the essential factors for IoT systems that are recently increasing in demand. In the Wireless Systems Laboratory, we are proposing enhancments for SUN, which is known as a radio network for smart metering systems. Such enhancements include autonomous network construction and management technology assuming more than 1000 radio devices, and low-energy operation technology that enables several-year-operation by battery.

For the autonomous network construction and management technology, effective routing schemes with autonomous information exchanges among massive radio devices have been proposed.

For the low-energy operation technology, effective sleep period employment schemes as well as dynamic sleep period management according to the latency tolerance conditions have been proposed.

Technical Description

Two major technical features are considered for the Wireless Grid; (1) Harmonized mesh capabilities by massive radio device cooperation and (2) flexible service with low-energy operation capabilities.


Harmonized mesh capabilities by massive radio device cooperation

In order to realize this feature, we are conducting studies on several functions:

(a) Autonomous mesh construction function to realize suitable mesh topology construction and perform maintenance according to the situation,

(b) Data concatenation function to decrease frame collision events by decreasing the number of frames

(c) Multiple services supporting function which employs several L2R (Layer 2 Routing) meshes in the uniform network topology, where each copes with different types of services.


Flexible service with low-energy operation capabilities

In order to realize this feature, we have employed the intermittent stand-by technique with sleeping periods in our medium access control scheme to reduce the unnecessary stand-by, which is one of most serious sources of energy wastage.

By adjusting the ratio between the stand-by period and sleep period to 1:100~1:1000, we are able to extend the battery life time by about 100~1000 times. Reducing the frequency of the periodical synchronization signal broadcasting also improves the low-energy performance.

Moreover, we are also engaged in research on the sleeping period adaptation according to the required latency or topology-updating conditions by the assumed applications.

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Go to Top MENU × TOP About Us About Us News & Information Research Projects Research Projects Challenges to Use RF Signals in Underwater Command Hopper & Drone Mapper Device-to-Device (D2D) Communications Flexible Factory Project (FFPJ) Impulse-Radio Ultra-WideBand (IR-UWB) Local 5G System Simultaneous Transmission Access Boosting Low-latEncy (STABLE) Wireless Grid Researchers Achievements Achievements Awards Press Releases Publications Videos FSPJ Documents Technology Transfer Closer to You Closer to You Collaborations Employment Events Exhibition Facilities Instagram Twitter Access Access Wireless Networks Research Center NICT Headquarters Kashima Space Technology Center Contact Links Wireless Networks Research Center Space Communication Systems Laboratory