Lucent Technologies Inc.

Winston Edward Pekrul

Semyon B Mizikovsky

Adam L Berenzweig

Robert J Rance

Alex Matusevich

Donald J Youtkus

Steven Anthony Falco

Jonathan Michael Tobias

Chris Constantine Tsamutalis

Russell Bernard Benedict

In the method for dynamically determining interference and carrier-to-interference ratio, interference is measured during an active TDMA time slot. In one embodiment, a base station determines the interference level in an active time slot using power level measurement taken during a DTX OFF period, when a mobile station is transmitting in discontinuous transmission mode. In another embodiment, a base station orders a mobile station to cease transmission during a SACCH portion of the time slot, and determines an interference level I measurement using power level measurements taken during the inactive SACCH field. Another embodiment provides for the determination of an interference level I using power level measurements taken during the guard and ramp fields.

Method to dynamically determine interference and carrier-to-interference ration during TDMA calls

Disclosed is an encrypting speech processor architecture that provides enhanced security without the use of external cryptosync and with minimal speech degradation. This is accomplished by incorporating a block encryptor and a keystream generator (instead of a fixed secret mask encryption scheme, such as those implemented in voice ciphers) for encrypting blocks of encoded speech bits at a transmitter side. The block encryptor employs an invertible cryptographic algorithm and internal cryptosync to convert a first block of encoded speech bits into a first ciphertext block. The first ciphertext block is used to generate a keystream, which is then used to encrypt a second ciphertext block.

Encrypting speech coder

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Piscataway, NJ, United States of America

Winston Edward Pekrul