Motorola Corporation

Scott O Nyhart

William F Pickert

Tan V Doan

A communication system including a base station (102) and a handset (104) provides a reduced level of near end reflections which results in a reduced level of sidetone for both near end and far end users. The base station includes an echo canceler (124) that trains on noise generated by the echo canceler (124) during inter digit dialing.

Method and apparatus for echo canceling in a communication system

A communication system (100) comprises a central controller (102), a plurality of base stations (104 and 106) coupled indirectly via the central controller and using radio frequency waves to communicate to communication unit(s), one of the base stations being a source base station (104) and at least another base station being a destination base station (106), and at least one communication unit (108) operable on the base stations. The communication system is able to synchronize a handoff of the communication unit between the source base station to the destination base station, wherein the source base station is the originating communication resource for the communication unit and the destination base station is the recipient communication resource for the communication unit subsequent to the handoff.

Method and apparatus for handoff synchronization

A method of determining when a communication device (11) is out-of-range of an incoming call from a central station (25), disallows communication between them for the out-of-range condition. In the central station (25), a page signal is transmitted (20) representing a call to the communication device (11). The central station (25) is capable of receiving (12) signals transmitted by the communication device (11). Recognizing (40) a lack of response by the communication device to the page signal from the central station, the central station withholds the transmission of a call set-up grant signal. Meanwhile, in the communication device, signals transmitted by the central station are received (50). The communication device transmits a page-response signal (555) representing the reception of the page signal. Recognizing an absence of a call set-up grant signal (562), the communication device indicates (563) to the subscriber that the communication device is out-of-range of the coverage area of the central station for the call.

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Algonquin, IL, United States of America

Scott O Nyhart