| 摘要 |
A multiple mode, personal, wireless communications system is provided herein which exists within a radiotelephone network serving general customers and provide s additional services to a select group of customers. In one embodiment, the system uses handsets which automatically switch between a standard cellular radiotelephone mode o f operation and an enhanced cordless mode when the handsets are within range of pico cel ls that are interconnected to the public switched telephone network. Each pico cell is controlled via a framework of overlay cells that operates independently of the radiotelephone network and uses a unique control protocol on a small number of reserved cellular channels. Each pico cell consists of a spectrally-dynamic, non capturing, frequency-agile, multi - purpose base station which is provided at customer-selected locations to cooperate with t he overlay cell framework. Each pico cell is capable of supporting multiple handsets and use s low power operation that achieves limited coverage, and reduces traffic on the standar d cellular radiotelephone network by independently handling registered handsets. An alternate line option module provides wireless local interconnect capability to selectively route call traffic between land lines and the standard cellular radiotelephone network. Service control units and host stations facilitate wireless activation and control of each pico ce ll and handset via the overlay cell framework. The multiple mode telecommunication system may further include a portable handset with a single transceiver which is capable of operating in accordance both with a first wireless control protocol and with a second wireless control protocol. The first wireless control protocol has a post-activation registration session which is initiated by the handset transmitting a reverse channel message without receiving a corresponding forward channel message. The second wireless control protocol has a post- activation registration session which is initiated by the handset transmitti ng a reverse channel message after receiving a corresponding forward channel message stream. A local base station includes a transceiver which is capable of exchanging communications with the handset in accordance with the first wireless control protocol when the handset is within a local range of the local base station. Switching means are coupled to the handset transceiver, for automatically setting the handset transceiver to engage in communications with a land station under the second wireless control protocol when the handset is moved beyond range of the local base station. |
