Wireless Grid

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.