RANDOMIZATION OF PLAIN TEXT FOR GSM SACCH

WIPO Patent Application WO/2013/029169

A8

The present document relates to the transmission of data in a digital cellular telecommunications network. In particular, the present document relates to the secure transmission of data over Global System for Mobile Communications (GSM) networks. A method for encoding a SACCH information block in a wireless network is described. The method comprises randomizing a plurality of randomization unit input bits derived from at least some of a plurality of payload bits of the SACCH information block using a pseudo- random bit block, thereby yielding a plurality of randomized bits; and ciphering a plurality of ciphering unit input bits derived from at least some of the plurality of randomized bits, thereby yielding an encoded data burst of a SACCH frame; wherein ciphering is based on a ciphering algorithm using a ciphering key Kc and a frame number COUNT of the SACCH frame; wherein the pseudo-random bit block is determined based on the ciphering key Kc.

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XIN YAN (CA)
WU HUAN (CA)
SEETHARAM RAVEENDRA (CA)

PCT/CA2012/050580

April 25, 2013

August 22, 2012

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RESEARCH IN MOTION LTD (CA)
XIN YAN (CA)
WU HUAN (CA)
SEETHARAM RAVEENDRA (CA)

H04L9/18

RIDOUT AND MAYBEE LLP (10th FloorToronto, Ontario M5V 3M2, CA)

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