D.5 Synthetic summary

3GPP43.020Release 17Security related network functionsTS

Figure D.5.1 shows in a synopsis a routing area updating procedure with all elements pertaining to security functions, i.e. to TLLI management, authentication and GPRS-Kc management.

MS

SGSNn

SGSNo

HPLMN

RAI, TLLIo

RAI, TLLIo

>

>

Routing area updating

IMSI

RAND

SRES

GPRS-Kc

Ki

RAND

<

<

V V

A3&A8

SRES

>

V

=

GPRS-Kc

V

yes

start of ciphering

Update location

>

Acknowledge

<

Allocation of TLLIn

Routing area update Accept

<

TLLI acknowledge

>

Cancellation

<

De-allocation of TLLIo

Figure D.5.1: Routing area updating procedure