PACS for in-building wireless telephony and data

This paper presents the TDD version of the PACS (Personal Access Communications System) designed to be used for wireless Centrex, or PBX applications as well as private residential applications. A set of radio air interface protocols is described which is intended to operate in the 1920 to 1930 MHz unlicensed PCS (UPCS) frequency band allocated by the US FCC for isochronous operation, intended for voice and data circuit based communications. The protocol is based on the FDD version of the PACS radio air interface protocol which is to operate in the licensed spectrum between 1850 and 1990 MHz. TDD version of PACS conforms to the new FCC Part 15, Subpart D, etiquette and is compliant with the rules of the FCC Memorandum Opinion and Order, June 9, 1994.