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Mobile WiMAX Has Capacity to Complement 3G In Urban Areas
13th March , 2006

ASIA Japan : KDDI announced that it has successfully completed field trials of a Mobile WiMAX system, the first in Japan to be built in accordance with IEEE802.16e, in the central Osaka area. The trials verified Mobile WiMAX functionality in an urban environment in demonstrating practical communication speed along with basic performance and high-speed handover between base stations.

A Mobile WiMAX platform supports stable, high throughput communications in non-fixed environments at speeds of less than 120km/hour. As one base station covers a radius area of several kilometers, the system is suitable for providing service in an urban environment. KDDI confirms Mobile WiMAX has the capacity to become a platform that will complement 3G mobile phone systems in urban areas.

The field trials also demonstrated the successful connectivity of Mobile WiMAX to "Ultra 3G" as a part of its access operability. In addition to WiMAX, the trials also examined "Ultra 3G" connectivity with EV-DO, ADSL, etc. and successfully demonstrated a world first 'seamless handover' between WiMAX and EV-DO. An "Ultra 3G" trial system also connected the WiMAX system to an MMD [1] application server via an IPv6 network.

With these trials, KDDI succeeded in testing services that can only be found on an "Ultra 3G" platform, including interoperability on both fixed and mobile networks, such as Mobile WiMAX, and the automatic selection of the most suitable network across various user functions such as exchanging picture and sound files.

KDDI plans to commercialize Mobile WiMAX in the future, and will continue to carry out various performance tests, including simultaneous multi-terminals connectivity, and trials with adaptive arrays [2], an advanced technology which can improve the system's performance.

[1] MMD (MultiMedia Domain)
An all IP MultiMedia Platform targeting mobile devices based on the 3GPP2 standard. Several internet technologies such as SIP Protocol are used, making it easier to integrate internet and mobile phone networks.
[2] Adaptive Array
Technology using multiple antennas to project radio waves in the desired direction, and eliminate the influences of unwanted radio waves.