ITU-R has since the year 2000 developed ITU-R Recommendations related to the terrestrial components of the IMT-2000 radio interface(s). In particular, Recommendation ITU-R M.1457 « Detailed specifications of the terrestrial radio interfaces of International Mobile Telecommunications-2000 (IMT-2000)" has a defined procedure for addressing future revisions.

This web page has been established to facilitate the ongoing enhancement of the terrestrial components of the radio interface(s) for IMT-2000. This includes updates for the existing radio interfaces in Recommendation ITU-R M.1457 and also accommodates the submission and subsequent evaluation of any new proposals for radio interfaces for IMT-2000.

The previous update procedure/process for IMT-2000 developed in 2001 has served well for more than 10 years of updates, however there are a number of advantages to moving to a common procedural approach for both IMT-Advanced and IMT-2000 updates.

It was determined that the update process developed for IMT-Advanced could be utilized with some minor modifications as the procedure for future updates to IMT-2000 replacing the current Recommendation ITU-R M.1457 update procedure as was defined in Circular Letter 8/LCCE/95. The philosophy is to keep the revised Recommendation ITU-R M.1457 update process as close as possible to the IMT-Advanced update process, in order to incorporate the improvements introduced for IMT-Advanced also for the Recommendation ITU-R M.1457 update.

The relevant External Organizations also supported a move to similar processes/procedures for both IMT-Advanced and IMT-2000.

It is noted that the change to the update process for Recommendation ITU-R M.1457 as identified in this Document IMT-2000/1, administratively eases the work within all the organizations and also within the ITU-R.

• Counsellor, ITU-R Study Group 5