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http://www.jaxa.jp/projects/rockets/htv/index_e.html

Tests are currently being performed on the Proximity Communication System (PROX) at NASA's Kennedy Space Center (KSC).

The PROX system will be installed in the Japanese Experiment Module "Kibo" to communicate between the H-II Transfer Vehicle (HTV) and transmit and receive data between the International Space Station (ISS). It will also measure the relative distance and speed between the ISS and the HTV in order to support the HTV's rendezvous with the ISS.

Since last year, tests on the PROX and a compatibility test for the PROX/rack had been carried out before it went through a pre-shipping examination and was shipped out to the U.S. in January 2007. After performing several tests like the JEM/PROX compatibility test, it will be installed in the Experiment Logistics Module Pressurized Section (ELM-PS) and is scheduled for launch on Assembly Flight 1J/A at the end of February 2008.

A pr. manager (Yoshihiko Torano) oldalán ezt írja:

The first HTV launch is scheduled for 2009, after the Japanese Experiment Module (JEM) "Kibo" has been attached to the ISS. After that, we are planning to support manned activities on the ISS by flying the HTV once a year.
http://www.jaxa.jp/projects/rockets/htv/manager_e.html