Redirection to GSM

(1) UE <--> NW : Registration (Combined or Non-Combined)

(2) UE <--> NW : < IDLE >

(3) UE  : < Make a MO Packet Call >

(4) UE --> NW : RRC CONNECTION REQUEST

(5) UE <-- NW : RRC CONNECTION SETUP

(6) UE --> NW : RRC CONNECTION SETUP COMPLETE

(7) UE --> NW : GMM SERVICE REQUEST

(8) UE <-- NW : AUTHENTICATION AND CIPHERING REQUEST

(9) UE --> NW : AUTHENTICATION AND CIPHERING RESPONSE

(10) UE <-- NW : SECURITY MODE COMMAND

(11) UE --> NW : SECURITY MODE COMPLETE

(12) UE --> NW : ACTIVATE PDP CONTEXT REQUEST

(13) UE <-- NW : RADIO BEARER SETUP

(14) UE --> NW : RADIO BEARER SETUP COMPLETE

(15) UE <-- NW : ACTIVATE PDP CONTEXT ACCEPT

(16) UE <--> NW : < User Data Flow >

(17) NW : Trigger for Redirection

(18) UE <-- NW : RRC CONNECTION RELEASE

(19) UE --> NW : RRC CONNECTION RELEASE COMPLETE

(20) UE --> NW : RRC CONNECTION RELEASE COMPLETE

(21) UE --> NW : RRC CONNECTION RELEASE COMPLETE

(22) UE --> NW : CHANNEL REQUEST/HANDOVER ACCESS

(23) UE <-- NW : IMMEDIATE ASSIGNMENT

(24) UE --> NW : ROUTING AREA UPDATE REQUEST

(25) UE <-- NW : AUTHENTICATION AND CIPHERING REQUEST

(26) UE --> NW : AUTHENTICATION AND CIPHERING RESPONSE

(27) UE <-- NW : IDENTITY REQUEST

(28) UE --> NW : IDENTITY RESPONSE

(29) UE <-- NW : ROUTING AREA UPDATE ACCEPT

(30) UE <-- NW : ROUTING AREA UPDATE COMPLETE

RRC Connection Release

  +-message ::= CHOICE [rrcConnectionRelease]

    +-rrcConnectionRelease ::= CHOICE [later-than-r3]

      +-later-than-r3 ::= SEQUENCE

        +-rrc-TransactionIdentifier ::= INTEGER (0..3) [0]

        +-criticalExtensions ::= CHOICE [r4]

          +-r4 ::= SEQUENCE [1]

            +-rrcConnectionRelease-r4 ::= SEQUENCE [10]

            | +-n-308 ::= INTEGER (1..8) [2] OPTIONAL:Exist

            | +-releaseCause ::= ENUMERATED [normalEvent]

            | +-rplmn-information ::= SEQUENCE OPTIONAL:Omit

            +-v4d0NonCriticalExtensions ::= SEQUENCE [01] OPTIONAL:Exist

              +-rrcConnectionRelease-r4-add-ext ::= BIT STRING OPTIONAL:Omit

              +-v690NonCriticalExtensions ::= SEQUENCE [0] OPTIONAL:Exist

                +-rrcConnectionRelease-v690ext ::= SEQUENCE [1]

                | +-redirectionInfo-v690ext ::= CHOICE [interRATInfo] OPTIONAL:Exist

                |   +-interRATInfo ::= SEQUENCE [1]

                |     +-rat ::= ENUMERATED [gsm]

                |     +-gsm-TargetCellInfoList ::= [1] OPTIONAL:Exist

                |       +-GSM-TargetCellInfo ::= SEQUENCE [1]

                |         +-bcch-ARFCN ::= INTEGER (0..1023) [20]

                |         +-frequency-band ::= ENUMERATED [dcs1800BandUsed]

                |         +-bsic ::= SEQUENCE OPTIONAL:Exist

                |           +-ncc ::= INTEGER (0..7) [1]

                |           +-bcc ::= INTEGER (0..7) [5]

                +-v770NonCriticalExtensions ::= SEQUENCE OPTIONAL:Omit