path: root/2018/phone_protocol-eh2018/gprs_attach.svg

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MS
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BSS (BTS,BSC,PCU)
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SGSN
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HLR
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GPRS Attach Procedure
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Cell Selection
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L1 RACH burst (cause=TBF)
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AGCH: RR IMMEDIAGE ASSIGN
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Switch from BCCH/CCCH to dedicated mode
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UL TBF establishment
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RLC/MAC Layer
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BSSGP UL-UD (LLC (GMM ATTACH REQUEST))
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optional: GMM IDENTITY REQ + RESP (IMSI) if SGSN doesn't know TMSI
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MAP SEND AUTH INFO req
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MAP SEND AUTH INFO resp
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BSSGP DL-UD (LLC (GMM AUTH REQ))
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DL TBF establishment
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RLC/MAC Layer
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RLC/MAC (LLC (GMM AUTH REQ))
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BSSGP UL-UD (LLC (GMM AUTH RESP))
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SRES(MS) == SRES(HLR) ?
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MAP UPD GPRS LOC AREA req
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MAP INSERT SUBSCR DATA req
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MAP INSERT SUBSCR DATA resp
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MAP UPD GPRS LOC AREA resp
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BSSGP DL-UD (LLC (GMM ATTACH ACCEPT))
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RLC/MAC (LLC (GMM ATTACH ACCEPT))
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RLC/MAC (LLC (GMM P-TMSI REALLOC COMPL)
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BSSGP (LLC (GMM P-TMSI REALLOC COMPL)
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