UTRAN Complete Signaling Sequences

UTRAN and UMTS Radio Protocols 1

Complete Signaling Sequences in UTRAN R

Appendix A: Complete Signaling Sequences in UTRAN

Complete signaling message sequence charts with Iu, Iub, Iur and Uu Protocols with focus on the functional protocols RANAP, NBAP, RNSAP, RRC.



1. RRC Connection Setup into state CELL_DCHA UE has entered the area of a RNC and triggers now radio contact. The reason for the radio access is a higher layer service request coming from NAS protocols (e.g. MM, GMM, SM, CC, SMS, etc.). The following actions must be done:

•1. Random access: The UE accesses the RACH and sends the message RRC Connection Request.

•2. DCH Allocation: The RNC must now decide which channel to allocate. This decision is based upon the service the UE wants to have and upon the actual congestion level. The DCH requires set up of a communication context in the Node B (Radio Link Setup) and configuration of a AAL2 virtual channel that shall transport the established DCH. Additionally the channel between serving RNC and Node B must be synchronized (Downlink Synchronization and Uplink Synchronization).

•3. DCH Activation and RRC connection completion: When the DCH is prepared, the RNC informs the UE about the successful established RRC Connection and gives the UE all infor-mation about its new dedicated channel DCH (e.g. transport formats, physical layer parameters, RLC configuration). Now the UE will begin to send on the DCH and synchronize itself with the Node B. When this is successfully done, the UE and Node B will send an indication about the successfully synchronized radio link (RRC Connection Setup Complete and Radio Link Restore Indication).

From the point of RRC states the UE begins the procedure in UTRA IDLE mode and leaves the procedure in CELL_DCH mode.



RRC Connection Establishment to RRC State CELL_DCH

Menu

UE Node B RNCRACH:CCCH RRC Connection RequestRRC RRC

allocate RNTI,select L1 and L2parameters

NBAP NBAPRadio Link Setup

start Rx

NBAP NBAPRadio Link Setup Response

ALCAP ALCAPEstablishment Request

ALCAP ALCAPEstablishment Confirmed

DCH-FPDCH-FP Downlink Synchronisation

DCH-FPDCH-FP Uplink Synchronisation

start Tx

FACH:CCCH RRC Connection SetupRRC RRC

NBAP NBAPRadio Link Restore Indication

DCH:DCCH RRC Connection Setup CompleteRRC RRC



2. RRC Connection Establishment to RRC state CELL_FACHIn the following sequence the UE again performs an access to get a RRC connection, but this time only a FACH is granted to the UE.

•1. Random Access:The UE access the RACH and sends RRC Connection Request. This message is received by the RNC. The RNC must again de-cide, which resources shall be granted to the UE. In the present case only the FACH/RACH will be accessible for the UE. Thus there is no need to allocate any resource on Iub or Uu.

•2. RRC connection establishment completion:The RNC indicates now the successful establishment of the RRC connection with RRC Connection Setup. In this message the UE gets the information to use the FACH/RACH as transport resources. The message itself is sent on the FACH. The UE will answer with RRC Connection Setup Complete on the RACH, this message requires a last acknowledgement on the FACH.



RRC Connection Establishment to RRC State CELL_FACH

Menu

UE Node B RNC

RACH:CCCH RRC Connection RequestRRC RRC

allocate RNTI,

FACH:CCCH RRC Connection SetupRRC RRC

RACH:DCCH RRC Connection Setup CompleteRRC RRC

FACH:CCCH RLC acknowledgement for RRC Connection Setup CompleteRRC RRC



3. Radio Access Bearer Establishment from CELL_DCH with DCH Setup - synchronized The following procedure shows a radio access bearer setup triggered by the core network (MSC or SGSN). The UE is initially in RRC state CELL_DCH. This means a DCH already exists for the UE. The radio access bearer requires a DCH. The procedure will show as general case a soft handover situation, this means we will see two radio links (already existing) in two different Node B and one Node B belongs to the serving RNC and the other Node B belongs to a drift RNC.The procedure will be performed as so called synchronized radi link modification.

•1. Radio Access Bearer RequestThe core network will send the RANAP message RAB Assignment Request to the actual serving RNC of the UE. The RNC has to analyze the quality of service parameter for the RAB. These abstract parameters have to be mapped onto physical parameters for the setup of transport bearers on Iu, Iub, Iur and Uu.

•2. Iu Bearer Setup and Radio Link PreparationThe serving RNC begins now to set up all the individual bearer services. First of all the Iu bearer must be set up when a circuit switched service (Iu-CS) is wanted, for packet oriented services this is not necessary. Second the serving RNC triggers both Node B to prepare the radio link needed for the UE (Radio Link Reconfiguration Prepare). Because there is already a DCH, this one will simply be modified to fulfill the requirements of the RAB. If both Node B have prepared the radio resources, they will send a Radio Link Reconfiguration Ready message to the serving RNC back. Concurrently with this the serving RNC triggers the establishment of AAL2 virtual channel resources for the radio link for Iub and Iur interfaces. These two ATM transport bearer resources require a synchronization between serving RNC and the Node B at the endpoint. This is done with the Iub/Iur frame protocols (Uplink Syn-chronization and Downlink Synchronization).

•3.Radio Bearer Setup CompletionNow that the radio link and the associated Iur/Iub transport bearer are established, it is time to change the DCH configuration. There-fore the serving RNC sends Radio Link Reconfiguration Commit to both Node B and the UE gets the Radio Bearer Setup message from it. The UE and the Node B will now apply the new transport formats and physical channel configuration and try to decode each other. If this is successful, the UE sends Radio Bearer Setup Complete to the serving RNC. This indicates a successful radio bearer setup. Thus the serving RNC can return RAB Assignment Response back to the core network with a success indication inside.



Radio Access Bearer Establishment in state CELL_DCH with DCH required (synchronised) 1(2)

Menu

UENode BDrift RNS

Node BServing RNS Drift RNC Serving RNC CN

RAB Assignment RequestRANAP

select Iu, Iub, Iur andUu bearer parameter

RANAP

ALCAP: Iu TransportBearer Setup (only Iu-CS)

Radio Link ReconfigurationPrepare RNSAPRNSAP

Radio Link Reconfiguration PrepareNBAPNBAP

Radio Link Reconfiguration PrepareNBAPNBAP

Radio Link Reconfiguration ReadyNBAPNBAP

Radio Link Reconfiguration ReadyNBAPNBAP

ALCAP: Iur TransportBearer Setup

ALCAP: IubTransportBearer Setup


DCH-FPDCH-FP

DCH-FPDCH-FP

Downlink Synchronisation


DCH-FPDCH-FP

DCH-FPDCH-FP

Uplink Synchronisation


Radio Link ReconfigurationReady RNSAPRNSAP



Radio Access Bearer Establishment in state CELL_DCH with DCH required (synchronised) 2(2)

Menu

UENode BDrift RNS


Radio Link ReconfigurationCommit RNSAPRNSAP

Radio Link Reconfiguration CommitNBAPNBAP

Radio Link Reconfiguration CommitNBAPNBAP

Radio Bearer Setup RRCRRCDCH:DCCH

New Transport Formats will be applied on DCH

Radio Bearer Setup Complete RRCRRCDCH:DCCH

RAB Assignment ResponseRANAPRANAP



4. Radio Bearer Setup in state CELL_DCH with DCH required - unsynchronizedThe procedure presented before was synchronized. This means that before the radio link is really modified, the modification itself is prepared in both Node B. The modification itself is done synchronized when the serving RNC sends the message Relocation Commit. The following procedure is now unsynchronized, this means, both Node B will immediately modify the radio link without waiting for each other.

•1. Radio Access Bearer RequestThe core network will send the RANAP message RAB Assignment Request to the actual serving RNC of the UE. The RNC has to analyze the quality of service parameter for the RAB. These abstract parameters have to be mapped onto physical parameters for the setup of transport bearers on Iu, Iub, Iur and Uu.

•2. Iu Bearer Setup and Radio Link PreparationThe serving RNC begins now to set up all the individual bearer services. First of all the Iu bearer must be set up when a circuit switched service (Iu-CS) is wanted, for packet oriented services this is not necessary. Now the serving RNC triggers both Node B to modify the existing radio links (Radio Link Reconfiguration). Each Node B performs immediately the reconfiguration and returns the message Radio Link Reconfiguration Response. Concurrently with this the serving RNC triggers the establishment of AAL2 virtual channel resources for the radio link for Iub and Iur interfaces. These two ATM transport bearer resources require a synchronization between serving RNC and the Node B at the endpoint. This is done with the Iub/Iur frame protocols (Uplink Synchronization and Downlink Synchronization).

•3.Radio Bearer Setup CompletionThe serving RNC sends now the Radio Bearer Setup message to the UE. The UE and the Node B will now apply the new transport formats and physical channel configuration and try to decode each other. If this is successful, the UE sends Radio Bearer Setup Complete to the serving RNC. This indicates a successful radio bearer setup. Thus the serving RNC can return RAB Assignment Response back to the core network with a success indication inside.



Radio Access Bearer Establishment in state CELL_DCH with DCH required (unsynchronised) 1(2)

Menu

UENode BDrift RNS



select Iu, Iub, Iur andUu bearer parameter

RANAP


Radio Link ReconfigurationRequest RNSAPRNSAP

Radio Link Reconfiguration RequestNBAPNBAP

Radio Link Reconfiguration RequestNBAPNBAP

Radio Link Reconfiguration ResponseNBAPNBAP

Radio Link Reconfiguration ResponseNBAPNBAP




DCH-FPDCH-FP

DCH-FPDCH-FP



DCH-FPDCH-FP

DCH-FPDCH-FP



Radio Link ReconfigurationResponse RNSAPRNSAP



Radio Access Bearer Establishment in state CELL_DCH with DCH required (unsynchronised) 2(2)

Menu

UENode BDrift RNS


Radio Bearer Setup RRCRRCDCH:DCCH

New Transport Formats will be applied on DCH





5.Radio Bearer Setup in RRC state CELL_FACH with DCH requiredIn the two radio bearer setup procedures before always a DCH already existed. Now we look to the radio bearer setup with DCH from state CELL_FACH. This means currently there is no DCH before the radio bearer setup begins.

•1. Radio Access Bearer RequestThe core network requests the radio access bearer with the message RAB Assignment Request. The message contains the abstract quality of service description of the transport resources required. The RNC maps these abstract parameters to the individual links.

•2. Bearer SetupThe RNC triggers the setup of Iu bearer resources when circuit switched resources are needed. Next the DCH must be configured, but currently there is no radio link. Hence the serving RNC sets up a communication context with one radio link in one of its Node B. This is done with the message Radio Link Setup. The Node B acknowledges with Radio Link Setup Response. For the configured DCH a transport resource on Iub is needed, hence the serving RNC configures an AAL2 virtual channel for DCH transport. This Iub bearer is now synchronized between Node B and serving RNC.

•3. Radio Bearer Setup CompletionThe UE gets now the Radio Bearer Setup message in which it finds the configuration parameters for the DCH. So the UE applies these parameters and tries to synchronize the radio link with the Node B. If this is successful, the UE shall send Radio Bearer Setup Complete and the Node B shall issue Radio Link Restore Indication to the serving RNC. This concludes the radio bearer setup, thus the serving RNC can acknowledge with RAB Assignment Response to the core network.



Radio Access Bearer Establishment in state CELL_FACH with DCH required

Menu

UENode BDrift RNS



select Iu, Iub andUu bearer parameter

RANAP


Radio Link Setup RequestNBAPNBAP

Radio Link Setup ResponseNBAPNBAP


DCH-FPDCH-FPDownlink Synchronisation

DCH-FPDCH-FPUplink Synchronisation

Radio Bearer Setup RRCRRCFACH:DCCH



Radio Link Restore IndicationNBAPNBAP



6. Radio Bearer Setup in RRC state CELL_FACH with FACH requiredIf a UE gets a radio access bearer without DCH, then there is no need for dynamical transport bearer setup on Uu and Iub. This is because the common transport channel resources are preconfigured by the operator via O&M. So the radio bearer setup is relatively simple in this case.

•1. Radio Access Bearer RequestThe core network requests the radio access bearer with RAB Assignment Request. The serving RNC analyzes the abstract RAB description inside and derives the individual link parameters for Iu, Iub and Uu.

•2. Bearer SetupIn the present case the RAB requires no DCH and the UE will only get the FACH/RACH common transport channel resources. The RACH and FACH radio transport channels are already configured during cell setup. The same holds for the Iub ATM transport re-sources associated with RACH and FACH. Thus the only bearer that might need dynamical configuration can be the Iu bearer, but this is necessary for Iu-CS only. Hence the only thing to do is to tell the UE with Radio Bearer Setup to use FACH/RACH. The UE acknowledges with Radio Bearer Setup Complete. This message will be acknowledged. This concludes the RAB setup.



Radio Access Bearer Establishment in state CELL_FACH with FACH required

Menu

UENode BDrift RNS



select Iu, Iub andUu bearer parameter

RANAP


Radio Bearer SetupRRCRRC

FACH:DCCH

Radio Bearer Setup CompleteRRCRRC

RACH:DCCH


RLC Acknowledgement for Radio Bearer Setup CompleteRRCRRC

FACH:DCCH



7. Soft Handover - Radio Link Addition and DeletionConsider a UE that has multiple radio links with Node B directly connected to the actual serving RNC. So the UE is in a soft handover situ-ation. The present case describes the procedure when one radio link between UE and a Node B connected to the serving RNC is deleted and in the same procedure a new radio link between the UE and a Node B connected to a drift RNC is added.

•1. Preparation of new radio linkFirst of all the serving RNC must prepare the new radio link that shall be added. Therefore a communication context within the new Node B in the drift RNS has to be created, this happens with the Radio Link Setup message. It commands the Node B to decode the UE’s uplink scrambling code and to send data to the UE with a downlink scrambling code of the Node B. When the new radio link is prepared the Node B acknowledges with Radio Link Setup Response. After this the Iur and Iub ATM transport resources must be prepared. This resource is synchronized between Node B and serving RNC. Because the UE is already sending on its scrambling code, the Node B can already detect the UE’s signal, hence it will send Radio Link Restore Indication to the serving RNC.

•2. Active Set UpdateNow that the new radio link is prepared and the Node B already uplink data from the UE receives, the serving RNC must tell the UE also to decode the new downlink scrambling code of the new Node B. Therefore the serving RNC sends Active Set Update to the UE which will especially contain the new downlink scrambling code to decode. In the same message the UE can be advised to no longer decode an obsolete, old downlink scrambling code. The UE acknowledges with Active Set Update Complete.

•3. Deletion of the old radio linkThe old radio link that is no longer decoded by the UE must now be released in the associated Node B. Hence the serving RNC sends a Radio Link Deletion message to it. The Node B will remove the radio link. If this was the last radio link in the communication context for the UE, the context is deleted too.



Soft Handover - Radio Link Addition and Deletion 1(2)

Menu

UENode BDrift RNS


Radio Link Setup RequestRNSAPRNSAP

Radio Link Setup RequestNBAPNBAP

decision to add anddelete a radio link

start Rx

Radio Link Setup ResponseNBAPNBAP

Radio Link Setup ResponseRNSAPRNSAP



Radio Link Restore IndicationNBAPNBAP

Radio Link Restore IndicationRNSAPRNSAP

DCH-FPDCH-FPDownlink Synchronisation


start Tx



Soft Handover - Radio Link Addition and Deletion 2(2)

Menu

UENode BDrift RNS


Radio Link Deletion RequestNBAPNBAP

Radio Link Deletion ResponseNBAPNBAP

ALCAP: IubTransportBearer Release

stop Rx and Tx

Active Set Update RRCRRCDCH:DCCH

Active Set Update Complete RRCRRCDCH:DCCH

(add radio link X, delete radio link Y)



8. Hard Handover without Serving RNC RelocationThe following use case describes a hard handover, where the UE changes Node B and both Node B belong to drift RNC and not to the serving RNC. The presented flow is therefore the most general one and can easily be reduced to cases where some RNC are equal.

•1. Handover Decision and PreparationThe serving RNC decide upon the handover based on the radio measurements made by UE and Node B. Before the handover can be started, the new radio link resources in the new (target) Node B must be prepared. Hence the serrving RNC triggers the setup of a communication context together with a radio link (Radio Link Setup Request). When the radio resources in the target Node B are prepared and the associated Iub ATM transport bearer resources between target Node B and target RNC is prepared, the serv-ing RNC will be informed about it (Radio Link Setup Response). The serving RNC can now trigger the establishment of an Iur ATM transport bearer. The Iub/Iur ATM transport bearer will be synchronized between target Node B and serving RNC.

•2. Handover ExecutionThe UE begins handover execution when the serving RNC sends a reconfiguration message to it (Physical Channel Reconfigura-tion). The UE immediately begins to modify its radio links. Hence the old (source) Node B loses the radio contact and therefore makes a Radio Link Failure Indication. In contrast to that the target Node B will now receive the signal of the UE and hence sends a Radio Link Restore Indication. In the same way the UE indicates the successful reception of the target RNC radio signal with a reconfiguration completion indication (Physical Channel Reconfiguration Complete).

•3. Garbage CollectionIt remains to remove the radio and Iub/Iur resources of the old radio link. Therefore the serving RNC sends a Radio Link Deletion message to the source Node B. This message will delete the radio link and when it was the last radio link, the communication context in the source Node B will be deleted too. Last the Iub/Iur ATM transport resources to and from the source Node B can be cleared.



Hard Handover between different RNC without S-RNC relocation 1(2)

Menu

UENode B

Target RNSNode B

Source RNS Target RNC Source RNC Serving RNC

NBAP

ALCAP: IubTransportBearer Establishment

HandoverDecision

RRC

DCH-FP

RNSAP

Physical Channel Reconfiguration

Radio Link Setup RequestRNSAP

Radio Link Setup RequestNBAP

start Rx

NBAPRadio Link Setup Response

NBAP

RNSAPRadio Link Setup Response

RNSAP

RRCDCH:DCCH

DCH-FPDownlink Synchronisation


NBAPRadio Link Failure Indication

NBAP

RNSAPRNSAPRadio Link Failure Indication

ALCAP: IurTransportBearer Establishment



Hard Handover between different RNC without S-RNC relocation 2(2)

Menu

UENode B

Target RNSNode B

Source RNS Target RNC Source RNC Serving RNC

NBAP


RRC

ALCAP: Iur TransportBearer Release

RNSAP

Physical Channel Reconfiguration Complete

Radio Link Deletion RequestRNSAP

Radio Link Deletion RequestNBAP

NBAPRadio Link Deletion Response

NBAP

RRCDCH:DCCH

NBAPRadio Link Restore Indication

NBAP

RNSAPRNSAPRadio Link Restore Indication

RNSAPRadio Link Deletion Response

RNSAP



9. Hard Handover with Serving RNC RelocationThe following scenario shows a hard handover associated with a relocation of the serving RNC. The serving RNC at the begin of the pro-cedure is labelled as source RNC, whereas the RNC that shall be the serving RNC at the end of the procedure is called target RNC. The procedure is presented for the case that there is a signaling connection towards SGSN and MSC. A change of MSC (inter-MSC handover) or a change of SGSN is not considered here.

•1. Relocation Indication and PreparationThe decision to perform a relocation together with hard handover comes exclusively fromt the actual serving (source) RNC. The Relocation Required message indicates the relocation to the core network. MSC and SGSN shall prepare the relocation and inform the target RNC with Relocation Request. This triggers the target RNC to prepare the radio access bearer resources for the UE. In detail this means for the target RNC to set up an Iu ATM transport bearer towards MSC, to allocate the radio link for the UE in the new Node B (Radio Link Setup) and with this the associated Iub ATM transport bearer for the DCH is needed. The Iub transport bearer must be synchronized. When all is done, the target RNC sends an acknowledgement (Relocation Request Acknowledge) back to each core network domain.

•2. Relocation ExecutionTo start relocation both CN domains must send Relocation Command to the source RNC. When this happened, the UE will get the a message that indicates the new radio resources for it (Physical Channel Reconfiguration). So the UE now tunes to the new radio link in the target Node B. Therefore the target Node B will send the Radio Link Restore Indication to target RNC, which will forward this indication as Relocation Detect. In the same way the source Node B will loose the radio link and sends Radio Link Failure Indication to the source RNC. When the UE concludes the radio link change, it will send Physical Channel Reconfiguration Complete on the new resource to the target RNC. This triggers the Relocation Complete message to both CN domains.

•3. Garbage CollectionThe resources in the source RNC and source Node B are no longer needed. Thus the core network will delete all resources with Iu Release Command.



Hard Handover between different RNC with S-RNC relocation 1(3)

Menu

UENode B

Target RNSNode B

Source RNS Target RNC Source RNC SGSN MSC

NBAP

DCH-FP

Radio Link Setup RequestNBAP

DCH-FPDownlink Synchronisation

ALCAP: Iu TransportBearer Establishment for Iu-CS

RANAPRANAPRelocation Required

RANAP RANAPRelocation Required

RANAPRANAPRelocation Request

RANAPRANAPRelocation Request

NBAPRadio Link Setup Response

NBAP

ALCAP: Iub TransportBearer Establishment


RANAPRANAPRelocation Request Acknowledge

RANAPRANAPRelocation Request Acknowledge




Menu

UENode B

Target RNSNode B


RANAPRANAPReloocation Command

RANAP RANAPRelocation Commnand

NBAPRadio Link Restore Indication

NBAP

RANAPRANAPRelocation Detect

RANAPRANAPRelocation Detect

RRCRRCPhysical Channel Reconfiguration

NBAPRadio Link Failure Indication

NBAP

RRCRRCPhysical Channel Reconfiguration Complete

RANAPRANAPRelocation Complete

RANAPRANAPRelocation Complete




Menu

UENode B

Target RNSNode B


NBAPRadio Link Deletion

NBAP

RANAPRANAPIu Release Command

RANAP RANAPIu Release Command


NBAP

ALCAP: IuTransportBearer Release


RANAPRANAPIu Release Complete

RANAP RANAPIu Release Complete



10. Switch from CELL_DCH to CELL_FACH with Drift RNCBased on the traffic measurements for a radio bearer the serving RNC must decide whether the UE shall be kept in state CELL_DCH utilizing a dedicated channel DCH or the UE must be sent to state CELL_FACH without a dedicated resource. In the present procedure the UE is currently located in a cell belonging to a drift RNC. At the start of the procedure the UE has one radio link in this cell.

•1 Preparation of new resourcesWhen the serving RNC decides to switch the UE’s state to CELL_FACH because there traffic is low, it is necessary to prepare the FACH and RACH transport resources. Because the UE is actually located in a cell of a drift RNC, this requires the set up of ATM transport resources for RACH and FACH and the remote allocation of bandwidth on these common transport channels. The latter is achieved with the RNSAP messages Common Transport Channel Resource Request. The ATM resources are then established.

•2 Radio Bearer modificationTo activate the switching to CELL_FACH the UE must be informed about the change with respect to the transport channel modifica-tion. Hence the serving RNC sends the RRC message Transport Channel Reconfiguration via the still existing DCH to the UE. The UE must now modify its radio configuration and when done confirm with Transport Channel Reconfiguration Complete.

•3 Release of old resourcesNow the resources associated with the obsolete DCH can be released.



Switch from CELL_DCH to CELL_FACH with Drift RNC

Menu

UENode BDrift RNS


NBAP


decision to switchfrom CELL_DCH to

CELL_FACH

RRC

ALCAP: IurTransport BearerConfiguration if needed

RNSAP

Transport Channel Reconfiguration

Common TransportChannel Resource Request

RNSAP

RNSAP

Common TransportChannel Resource Response

RNSAP

RRC

RRCTransport Channel Reconfiguration Complete

RRC

DCCH:DCH

DCCH:RACH

RNSAPRadio Link Deletion Request

RNSAP

NBAPRadio Link Deletion Request

NBAP

RNSAPRadio Link Deletion Response

RNSAP


ALCAP: IurTransportBearer Release



11. Cell Update without Serving RNC RelocationWhen the UE is in state CELL_FACH, it will perform cell reselection and with this must perform cell updates to keep the serving RNC in-formed about its location. In this situation it can happen, that the UE enters a cell not belonging to the serving RNC area. Thus the servin g RNC must forward the cell update message to the serving RNC. In detail the procedure looks the following way:

•1 Cell UpdateThe UE sends the RRC message Cell Update on RACH to the reselected cell. This message is received by the controlling RNC of the cell which is not the serving RNC of the UE. Inside the message the UE indicates its U-RNTI composed of S-RNC-ID and S-RNTI. From this the controlling RNC will know, that it is not the serving one for the UE. Hence the controlling RNC will forward the cell update message inside of a RNSAP message to the corresponding S-RNC.

•2 Common Transport Channel Resource PreparationThe serving RNC has to decide to perform a relocation or not. In the present case there will be no relocation. Therefore the S-RNC triggers the foreign RNC to allocate resources for FACH/RACH. This is done with the RNSAP operation Common Transport Channel Resource Request. Possibly this can mean, that ATM transport resources on Iur have to be set up.

•3 Procedure CompletionThe serving RNC can now indicate the successful cell update with RRC message Cell Update Complete. In this message the UE can be told to reconfigure its radio resources (transport channel, physical channel, radio bearer). In the present case there is no recon-fiiguration, which triggers the UE to complete the procedure with RRC message UTRAN Mobility Information Confirm. It remains to release the common transport channel resources in the old radio subsystem, hence the S-RNC sends the RNSAP message Com-mon Transport Channel Resource Release.



Cell Update to a new Drift RNC without Serving RNC Relocation in RRC state CELL_FACH

Menu

UENode B

Target Drift RNSNode B

Source Drift RNS Target Drift RNC Source Drift RNC Serving RNC

ALCAP: IurTransportBearer Configuration if needed

Decision NOTto make relocation

RRC

RNSAP

Cell UpdateRRC

CCCH:RACH

RNSAPUplink Signaling Transfer

(RRC Message: Cell Update)

RNSAPRNSAPCommon Transport Channel Resource Request

RNSAPRNSAPCommon Transport Channel Resource Response

RRC RRCCell Update Complete

RRC RRCUTRAN Mobility Information Confirm

RNSAPRNSAP

Common Transport ChannelResource Release

UTRAN Complete Signaling Sequences

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