Cordless telephone arranged for operating with multiple portable

Details Cordless telephone arranged for operating with multiple portable Cordless telephone arranged for operating with multiple portable

1997-10-01

2000-07-18

Pham, Chi H.

Pulse or digital communications

Spread spectrum

Frequency hopping

375133, 370330, 370474, 455132, 455133, A61F 206, H04L 2730

Patent

active

06091758&

ABSTRACT:
A cordless telephone is arranged for operation in a frequency hopping system includes an arrangement which achieves optimum utilization of multiple cordless telephone portable units by permitting these units to simultaneously access a common base unit. A physical layer of an air interface is provided by a two channel time division multiple access protocol for supporting a two channel multiple access system for the portable units. These two channels are considered as virtual channels and not dedicated to any particular telephone line, as in the case of two line telephone products. Nor are these two channels dedicated to any particular portable unit, but rather they are available for use by any portable unit in the telephone. A signaling layer of the air interface is provided for supporting the two channel multiple access system. Two types of subframes, acquisition and traffic, are illustratively provided in the air interface for the cordless telephone. The acquisition subframe is a synchronization frame that is configured for fast and reliable symbol and frame timing recovery. Single frame acquisition even in an extreme user hostile environment is achievable. Traffic subframes are used after a communication link has been built and full voice and/or data is interchanged. Signaling between the base unit and portable units is supported during both the traffic mode and the acquisition mode.

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