Revision of RCR STD-28 Based on the Enhancement of PHS


The Association of Radio Industries and Businesses (ARIB), in charge of developing and revising the PHS technical standard, has revised the RCR STD-28 in accordance with the latest enhancements made to PHS (Refer to News No. 18 published in October 1998 for the outline of the enhancements). These revisions will be included in RCR STD-28 version 3.2 which is soon to be published.

  1. The frequency band for private-use PHS has been expanded from 1895MHz to 1893.5MHz.
  2. The technical specifications (transmission power, antenna gain, etc.) for portable repeaters, installed inside buildings, are now outlined.
  3. The maximum output power of a cell station for public service has been increased from 500mW to 2W, measured at the control channel.
  4. The transmission output power of a cell station for the public service, in the frequency band which is shared by the private-use and the public service, is increased from 10mW to 20mW.
  5. The antenna gain of a private-use cell station has been changed from 2.14dBi to 4dBi.
  6. The antenna gain for public service CSs with adaptive array antennas is now stipulated as 16dBi.
  7. The maximum number of channels that can be simultaneously used by Personal Stations (PSs) have been increased from 2 to 4. For walkie-talkie mode (direct communication among PSs) this was also increased from 1 to 2.
  8. The carrier sense level (No. 2 level) in the communication carrier has been changed from 40dBmV to 44dBmV.
  9. The transmission output power allowance level has been increased by 7dB for the average level. Accordingly, TR-12, TR-2 and TR-T5 have been revised.
  10. 64kbit/s data transmission using two slots is now stipulated.
  11. Walkie-talkie direct communication mode can now be programmed directly into the PS without a home base station. Test items for (10) and (11) have now been outlined in TR-T2
  12. 64kbit/s data communication using two slots will be automatically shifted to 32kbit/s, using one slot, if two are not available. The transmission will be shifted back to 64kbit/s again whenever a second slot becomes available. These items are now stipulated in addition to 64kbit/s fixed transmission. Accordingly, test items have been added to TR-23 and TR-T5.
  13. PHS User-to-User Signal (PHS-UUS) is now defined, and the elements of the public service PHS-UUS have been outlined.