WIRELESS DIGITAL CODE DIVISION MULTIPLE ACCESS (CDMA) COMMUNICATION SYSTEM

摘要

PROBLEM TO BE SOLVED: To provide a wireless digital CDMA communication system which supports all types of voice and data communications while utilizing the minimum frequency bandwidth for each application.

SOLUTION: This system efficiently allocates ISDN bandwidth in response to a demand by a subscriber. When a subscriber unit is started, the system sets a channel and generates a spectrum spreading code necessary for supporting a maximum capacity channel required by the subscriber unit. It is not performed that part of the communication bandwidth is reserved until actually required by a subscriber unit. Since a call setup including the assignment of a spectrum spreading code is performed at the beginning of a call from a subscriber unit, a subscriber unit can quickly gain access to part of the frequency spectrum necessary for supporting a required specific application.

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