9 Security

3GPP43.055Dual Transfer Mode (DTM)Release 17Stage 2TS

The current procedures apply.

NOTE: LLC frames containing GPRS signalling messages and sent on the main DCCH are therefore ciphered twice, but that has been confirmed by SMG10 not to be a security problem. In "TCH/H + PDCH/H" and other multislot configurations, current GPRS ciphering is kept.