Cell Change Order 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) UE <-- NW : CELL CHANGE ORDER FROM UTRAN

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

(19) UE <-- NW : IMMEDIATE ASSIGNMENT

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

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

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

(23) UE <-- NW : IDENTITY REQUEST

(24) UE --> NW : IDENTITY RESPONSE

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

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

(17) UE <-- NW : CELL CHANGE ORDER FROM UTRAN

< Case 1 > Ordinary CCO

  +-message ::= CHOICE [cellChangeOrderFromUTRAN]

    +-cellChangeOrderFromUTRAN ::= CHOICE [r3]

      +-r3 ::= SEQUENCE [0]

        +-cellChangeOrderFromUTRAN-IEs ::= SEQUENCE [000]

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

        | +-dummy ::= SEQUENCE OPTIONAL:Omit

        | +-activationTime ::= INTEGER OPTIONAL:Omit

        | +-rab-InformationList ::= SEQUENCE OF OPTIONAL:Omit

        | +-interRAT-TargetCellDescription ::= SEQUENCE

        |   +-technologySpecificInfo ::= CHOICE [gsm]

        |     +-gsm ::= SEQUENCE [1]

        |       +-bsic ::= SEQUENCE

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

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

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

        |       +-bcch-ARFCN ::= INTEGER (0..1023) [5]

        |       +-ncMode ::= BIT STRING SIZE(3) [000] OPTIONAL:Exist

        +-laterNonCriticalExtensions ::= SEQUENCE OPTIONAL:Omit

< Case 2 > Network Assisted CCO

  +-message ::= CHOICE [cellChangeOrderFromUTRAN]

    +-cellChangeOrderFromUTRAN ::= CHOICE [r3]

      +-r3 ::= SEQUENCE [1]

        +-cellChangeOrderFromUTRAN-IEs ::= SEQUENCE [000]

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

        | +-dummy ::= SEQUENCE OPTIONAL:Omit

        | +-activationTime ::= INTEGER OPTIONAL:Omit

        | +-rab-InformationList ::= SEQUENCE OF OPTIONAL:Omit

        | +-interRAT-TargetCellDescription ::= SEQUENCE

        |   +-technologySpecificInfo ::= CHOICE [gsm]

        |     +-gsm ::= SEQUENCE [1]

        |       +-bsic ::= SEQUENCE

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

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

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

        |       +-bcch-ARFCN ::= INTEGER (0..1023) [5]

        |       +-ncMode ::= BIT STRING SIZE(3) [000] OPTIONAL:Exist

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

          +-cellChangeOrderFromUTRAN-r3-add-ext ::= BIT STRING OPTIONAL:Omit

          +-v590NonCriticalExtensions ::= SEQUENCE [0] OPTIONAL:Exist

            +-cellChangeOrderFromUTRAN-v590ext ::= SEQUENCE [1]

            | +-geran-SystemInfoType ::= CHOICE [sI] OPTIONAL:Exist

            |   +-sI ::= SEQUENCE OF SIZE(1..maxGERAN-SI[8]) [1]

                    // Put the system info block of Target GSM Cell here

            |     +-GERAN-SystemInfoBlock ::= OCTET STRING SIZE(1..23) [00]

            +-nonCriticalExtensions ::= SEQUENCE OPTIONAL:Omit