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Correcting deciphering mis-synchronization in mobile communication terminal

A mobile communication terminal and signal technology, applied in the field of interpretation, can solve problems such as lack of packet synchronization and decryption errors

Inactive Publication Date: 2015-01-21
MARVELL WORLD TRADE LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] In some communication systems, the lack of packet synchronization between the sender and receiver can lead to decryption errors

Method used

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  • Correcting deciphering mis-synchronization in mobile communication terminal
  • Correcting deciphering mis-synchronization in mobile communication terminal
  • Correcting deciphering mis-synchronization in mobile communication terminal

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Embodiment Construction

[0023] In some communication protocols, the sequence of communication packets is encrypted using an encryption scheme that depends on the value of the counter. As a security measure, the counter value is not transmitted over the air, but rather is incremented independently by the transmitter and receiver. In order to decrypt the packet, the receiver must have the correct counter value and provide it to the decryption circuit. Mechanisms of this class are used, for example, when voice calls are transmitted over a packet network such as, for example, a UMTS network. However, in some cases the receiver may miss an unknown number of packets in the sequence. In this case, the receiver may lose track of the correct counter value and thus be unable to decrypt subsequent packets.

[0024] Embodiments described herein provide improved methods and systems for handling encrypted packets in a communication receiver. In the disclosed technique, the encryption key in the transmitter and ...

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Abstract

A method includes, in a mobile communication terminal, receiving a signal, which carries media content that has been encrypted after being compressed in accordance with a compression protocol having a plurality of predefined configurations. Each configuration specifies a respective compression mode of the compression protocol. The received signal is decrypted, and one or more parameters that define a configuration of the compression protocol that was used for compressing the media content are determined from the decrypted signal. An absence of match is detected when the determined one or more parameters do not match any of the plurality of predetermined configurations of the compression protocol. An error in decrypting the received signal is identified based on detecting the absence of a match.

Description

[0001] Cross References to Related Applications [0002] This application claims the benefit of US Provisional Patent Application 61 / 847,676, filed July 18, 2013, the disclosure of which is incorporated herein by reference. technical field [0003] The present disclosure relates generally to communication systems, and more particularly to methods and systems for interpretation in a communication receiver. Background technique [0004] Some communication systems transmit voice signals in a compressed format. In such systems, voice calls are typically transported through the Radio Link Control (RLC) and Medium Access Control (MAC) layers of the communication connection. The RLC layer is defined, for example, in "Universal Mobile Telecommunications System (UMTS); Radio Link Control (RLC) Protocol Specification", 3GPP TS25.322, Version 11.2.0, Release 11, April 2013, which is incorporated herein by reference. The MAC layer is defined, for example, in "Universal Mobile Telecom...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W24/00H04L9/00H04M3/22
CPCH04L2209/80H04W12/08H04W12/02H04L63/0457H04L9/12H04L9/14H04W88/02H04L2209/30H04L1/0061H04W12/033H04L65/764
Inventor A·威克斯B·科伦菲尔德M·阿格蒙
Owner MARVELL WORLD TRADE LTD