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| GPRS attach requested with AT command +CGATT=1. Adaptation (MN) layer requests attach to GMM. |
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GMMREG-ATTACH-REQ |
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| Attach type=GPRS or combined attach. |
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| LLC Unack mode and RLC Ack mode for GMM messages so GMM sends its PDU in UNITDATA-REQ |
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LL-UNITDATA-REQ |
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| Primitive contain GMM PDU Attach Request - containing old TLLI, RAI etc. Ciphering off (GMM messages Attach Request, Ident Req/Resp, Auth & Ciph Request/Resp are *not* ciphered.) |
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GRR-DATA-REQ |
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RLC Ack mode for GMM messages
Primitive contain LLC PDU (UI frame) - which contain GMM PDU. |
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TBF |
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| Network GMM layer receives Attach Request and may trigger Security procedures. To do this, RLC/MAC (Downlink) TBF procedure is performed. |
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TBF |
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GRR-DATA-IND
[LLC UI frame] |
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LL-UNITDATA-IND [GMM PDU Identification Request] |
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LL-UNITDATA-REQ [GMM PDU Identification Response] |
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| Identification response would be IMSI. Also oldTLLI provided. |
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GRR-DATA-REQ
[LLC UI frame] |
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TBF |
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| One-phase access, RLC/MAC (Uplink) TBF procedure. |
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| Network GMM layer receives Identification Response. Now it may trigger Authentication & Ciphering request. |
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TBF |
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| RLC/MAC (Downlink) TBF procedure. |
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GRR-DATA-IND
[LLC UI frame] |
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| GMM now talk to SIM to execute security algorithms and generate responses/keys. This is same as for GSM (3GPP 11.11) 1. |
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LL-UNITDATA-IND [GMM PDU Authentication & Ciphering Request] |
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LL-UNITDATA-REQ [GMM PDU Authentication & Ciphering Response] |
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| Auth/Ciph response would be SRES given by SIM. |
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GRR-DATA-REQ
[LLC UI frame] |
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TBF |
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| One-phase access, RLC/MAC (Uplink) TBF procedure. |
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LLGMM-ASSIGN-REQ |
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| Contain Kc and the type of cihpering algorithm to be used. |
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| If Authentication response is ok, network triggers LLC XID negotiation. |
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TBF |
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| RLC/MAC (Downlink) TBF procedure. |
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GRR-UNITDATA-IND
[LLC XID frame] |
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GRR-UNITDATA-REQ
[LLC XID frame] |
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TBF |
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| RLC/MAC (Uplink) TBF procedure. |
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| Network GMM layer accepts Attach Request with Attach Accept. This would be now Ciphered. |
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TBF |
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| RLC/MAC (Downlink) TBF procedure. |
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GRR-DATA-IND
[LLC UI frame] |
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LLC-UNITDATA-IND
[GMM PDU Attach Accept] |
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| Attach Accept contain new PTMSI (from which new TLLI is calculated). GMM need to inform about attach to MN, give this TLLI to GRR and send Attach Complete to network. |
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GMMREG-ATTACH-CNF |
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| No receiving this confirmation, Adaptation layer gives AT OK to application layer. |
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LLGMM-ASSIGN-REQ
[new TLLI] |
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GMMRR-ASSIGN-REQ
[new TLLI] |
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LL-UNITDATA-REQ
[GMM PDU Attach Complete] |
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| Attach Complete contain new TLLI. |
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GRR-DATA-REQ
[LLC UI frame] |
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TBF |
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| GMM may need to send request to LLC and GRR for "unassigning" old TLLI". |
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| One-phase access, RLC/MAC (Uplink) TBF procedure. |
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| This complete the GPRS Attach procedure. |
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