Interoperable licensed and unlicensed wireless access for PCS

The FCC allocated 120 MHz of licensed spectrum and 20 MHz of unlicensed spectrum near 2 GHz for personal communications services (PCS). Licensed spectrum is likely to be used for public access in most outdoor and some indoor venues. Unlicensed spectrum is likely to be used for wireless Centrex/PBX, wireless payphone, and private residential wireless access. Network services for PCS will need to provide mobility functions such as registration, roaming, routing, and subscriber validation for a variety of venues and wireless access systems. Small and low complexity terminals can be achieved that provide access to licensed and unlicensed systems in a variety of venues by using wireless systems with a high degree of commonality across the transport and signaling layers for these environments. Low power TDMA can be used in frequency division duplex mode for licensed wireless access and in time division duplex mode for unlicensed wireless access to permit a low complexity terminal