3GPP TS V8.0.0 ( )

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1 TS V8.0.0 ( ) Technical Specification 3rd Generation Partnership Project; Technical Specification Group Services and System Aspects; Circuit Switched Fallback in Evolved Packet System; Stage 2 (Release 8) GLOBAL SYSTEM FOR MOBILE COMMUNICATIONS R The present document has been developed within the 3 rd Generation Partnership Project ( TM ) and may be further elaborated for the purposes of. The present document has not been subject to any approval process by the Organizational Partners and shall not be implemented. This Specification is provided for future development work within only. The Organizational Partners accept no liability for any use of this Specification. Specifications and reports for implementation of the TM system should be obtained via the Organizational Partners' Publications Offices.

2 2 TS V8.0.0 ( ) Keywords LTE, Fallback, CS, GSM Postal address support office address 650 Route des Lucioles - Sophia Antipolis Valbonne - FRANCE Tel.: Fax: Internet Copyright Notification No part may be reproduced except as authorized by written permission. The copyright and the foregoing restriction extend to reproduction in all media. 2008, Organizational Partners (ARIB, ATIS, CCSA, ETSI, TTA, TTC). All rights reserved.

3 3 TS V8.0.0 ( ) Contents Foreword Scope References Definitions and abbreviations Definitions Abbreviations Overall Description General Considerations Reference Architecture Reference points Functional entities UE MME MSC E-UTRAN Control plane MME - MSC Server Co-existence with IMS services Mobility Management General Attach procedure Detach procedure UE-initiated Detach procedure MME-initiated Detach procedure HSS-initiated Detach procedure TA/LA Update procedure Combined TA/LA Update Procedure Periodic TA and LA Update Procedure Mobile Originating Call General Mobile Originating call in Active Mode - PS HO supported Mobile Originating call in Active Mode No PS HO support in GERAN Mobile Originating call in Idle Mode Returning back to E-UTRAN Mobile Terminating Call General Mobile Terminating call in idle mode Mobile Terminating call in Active Mode - PS HO supported Mobile Terminating call in Active Mode - No PS HO support in GERAN Roaming Retry for CS fallback Returning back to E-UTRAN Interaction with ISR General Mobile Terminating Call when ISR is active and SGs is active between MSC/VLR and MME Mobile Terminating Call when ISR is active and Gs is active between MSC/VLR and SGSN Other CS Services General Short Message Service (SMS) General Mobile originating SMS in Idle Mode Mobile originating SMS in Active Mode Mobile terminating SMS in idle mode... 29

4 4 TS V8.0.0 ( ) Mobile terminating SMS in Active Mode Co-Existence with SMS over generic IP access Location Services (LCS) MO-LR procedure MT-LR procedure NI-LR procedure Returning back to E-UTRAN Co-Existence with Other Location Services Co-Existence with SUPL Call Independent Supplementary Services Mobile-Initiated Call Independent SS procedure NW-Initiated Call Independent SS procedure Returning back to E-UTRAN Annex A (informative): Solutions addressing misaligned LAs/TAs at Pool Area Boundaries A.1 Solution 1: Overlapping Pool Areas with 2G/3G coverage > E-UTRAN coverage at Pool Area Boundaries A.2 Solution 2: Overlapping Pool Areas with SGs-flex support Annex B (normative): CS Fallback to 1xRTT B.1 Overall Description B.1.1 General Considerations B.1.2 Reference Architecture B Reference points B.1.3 Functional entities B UE B MME B E-UTRAN B.1.4 Co-existence with IMS services B.2 Procedures B.2.1 Mobility Management B x RTT CS Pre-Registration over EPS Procedure B S102 Tunnel Redirection B.2.2 Mobile Originating Call B.2.3 Mobile Terminating Call Annex C (informative): Change history... 41

5 5 TS V8.0.0 ( ) Foreword This Technical Specification has been produced by the 3 rd Generation Partnership Project (). The contents of the present document are subject to continuing work within the TSG and may change following formal TSG approval. Should the TSG modify the contents of the present document, it will be re-released by the TSG with an identifying change of release date and an increase in version number as follows: Version x.y.z where: x the first digit: 1 presented to TSG for information; 2 presented to TSG for approval; 3 or greater indicates TSG approved document under change control. y the second digit is incremented for all changes of substance, i.e. technical enhancements, corrections, updates, etc. z the third digit is incremented when editorial only changes have been incorporated in the document.

6 6 TS V8.0.0 ( ) 1 Scope This document defines the Stage 2 architecture and specification for the CS Fallback for EPS. The scope of this document includes the architecture enhancements for functionality to enable fallback from E-UTRAN access to UTRAN/GERAN CS domain access and to CDMA 1x RTT CS domain access, and functionality to reuse of voice and other CS-domain services (e.g. CS UDI video / SMS/ LCS / USSD) by reuse of CS infrastructure. The architecture enhancements to support CS fallback for CDMA 1x RTT CS domain access are specified in Annex B. 2 References The following documents contain provisions which, through reference in this text, constitute provisions of the present document. References are either specific (identified by date of publication, edition number, version number, etc.) or non-specific. For a specific reference, subsequent revisions do not apply. For a non-specific reference, the latest version applies. In the case of a reference to a document (including a GSM document), a non-specific reference implicitly refers to the latest version of that document in the same Release as the present document. [1] TR : "Vocabulary for Specifications". [2] TS : "GPRS Enhancements for E-UTRAN Access". [3] TS : "General Packet Radio Service (GPRS); Service description; Stage 2". [4] TS : "Mobile radio interface layer 3 specification Radio Resource Control (RRC) protocol". [5] TS : "Basic call handling; Technical realization". [6] TS : "MSC-BSS interface layer 3 specification; Protocol specification". [7] TS : "Radio Resource Control (RRC); Protocol specification". [8] TS23.271: "Functional stage 2 description of Location Services (LCS)". [9] Open Mobile Alliance, OMA AD SUPL: "Secure User Plane Location Architecture", [10] TS23.090: "Unstructured Supplementary Service Data (USSD); Stage 2". [11] TS : "Location management procedures". [12] TS : "MS-BSS interface; RLC/MAC protocol ". [13] TS24.010: "Supplementary services specification; General aspects". [14] TS : "Technical realization of the Short Message Service (SMS)". [15] TS : Short Message Service (SMS) over generic Internet Protocol (IP) access. [16] 2 A.S0008-C: "Interoperability Specification (IOS) for High Rate Packet Data (HRPD) Radio Access Network Interfaces with Session Control in the Access Network" [17] 2 A.S0009-C: "Interoperability Specification (IOS) for High Rate Packet Data (HRPD) Radio Access Network Interfaces with Session Control in the Packet Control Function"

7 7 TS V8.0.0 ( ) [18] 2 A.S0013-C: "Interoperability Specification (IOS) for cdma2000 Access Network Interfaces part 3 Features [19] TS : "Improved Network Controlled Mobility between E-UTRAN and 2/Mobile WiMAX Radio Technologies" [20] TS : "Single Radio Voice Call Continuity (SRVCC); Stage 2". 3 Definitions and abbreviations 3.1 Definitions For the purposes of the present document, the terms and definitions given in TR [1] apply. A term defined in the present document takes precedence over the definition of the same term, if any, in TR [1]. 3.3 Abbreviations For the purposes of the present document, the abbreviations given in TR [1] apply. An abbreviation defined in the present document takes precedence over the definition of the same abbreviation, if any, in TR [1]. 4 Overall Description 4.1 General Considerations The CS fallback in EPS enables the provisioning of voice and other CS-domain services (e.g. CS UDI video/ SMS/ LCS/ USSD) by reuse of CS infrastructure when the UE is served by E-UTRAN. A CS fallback enabled terminal, connected to E-UTRAN may use GERAN or UTRAN to establish one or more CS-domain services. This function is only available in case E-UTRAN coverage is overlapped by either GERAN coverage or UTRAN coverage. The solution should have no or minimum impacts on CS domain entities and UE as well as the user experience on CS Domain services. It should be possible to handoff the ongoing data session to 2G/3G PS if the target cell supports simultaneous PS/CS sessions when the terminal use GERAN or UTRAN to establish one or more CS-domain services. It should be possible for the operator to provide SMS service to the user without the necessity to fallback to GERAN or UTRAN. It should be possible for the operator to provide LCS service to the user without the necessity to fallback to GERAN or UTRAN using other available technologies such as SUPL. The solution should be able to cope with imperfect planning between TA and 2G/3G LA. CS Fallback and IMS-based services shall be able to co-exist in the same operator s network.

8 8 TS V8.0.0 ( ) 4.2 Reference Architecture The CS fallback in EPS function is realized by reusing the Gs interface mechanism between the MSC Server and the MME. Uu Um UTRAN GERAN Iu-CS A SGs MSC Server UE E-UTRAN MME LTE-Uu S1-MME Figure 4.2-1: CS fallback in EPS architecture NOTE: The MGW is not shown in the figure since the CS fallback in EPS does not have any impacts to the U-plane handling Reference points SGs: It is the reference point between the MME and MSC server. The SGs reference point is used for the mobility management and paging procedures between EPS and CS domain, and is based on the Gs interface procedures. The SGs reference point is also used for the delivery of both mobile originating and mobile terminating SMS. 4.3 Functional entities UE The CS fallback capable UE supports access to E-UTRAN/EPC as well as access to the CS domain over GERAN and/or UTRAN. It supports the following additional functions: - Combined procedures specified in this document for EPS/IMSI attach, update and detach. - CS fallback and SMS procedures specified in this document for using CS domain services MME The CS fallback enabled MME supports the following additional functions: - Deriving a VLR number and LAI out of the TAI. - Maintaining of SGs association towards MSC/VLR for EPS/IMSI attached UE. - Initiating IMSI detach at EPS detach. - Initiating paging procedure specified in this document towards enodeb when MSC pages the UE for CS services. - Supporting SMS procedures defined in this document.

9 9 TS V8.0.0 ( ) MSC The CS fallback enabled MSC supports the following additional functions: - Maintaining SGs association towards MME for EPS/IMSI attached UE. - Paging on SGs and Iu/A in parallel. - Supporting SMS procedures defined in this document E-UTRAN The CS fallback enabled E-UTRAN supports the following additional functions: - Forwarding paging request and SMS to the UE. - Directing the UE to the target CS capable cell (FSS if this is done by MME or E-UTRAN). 4.4 Control plane MME - MSC Server SGsAP SCTP IP L2 L1 SGsAP SCTP IP L2 L1 MME SGs MSC Server Legend: SGsAP: This protocol is used to connect an MME to an MSC Server based on the BSSAP+. Stream Control Transmission Protocol (SCTP): This protocol transfers signalling messages. Figure : SGs Interface 4.5 Co-existence with IMS services If a UE is configured to use IMS voice services it shall, if registered to IMS, initiate voice calls over IMS, even if it is EPS/IMSI attached. NOTE: The home operator has to be able to activate/deactivate the UE configuration to use IMS voice services by means of device management in order to allow alignment with HPLMN support of IMS voice services. If a UE is configured to use SMS over IP services it shall, if registered to IMS, send SMS over IMS, even if it is EPS/CS attached. NOTE: The operator has to be able to activate/deactivate the UE configuration to use SMS over IP by means of device management in order to allow alignment with HPLMN support of SMS over IP. In special cases when the IMS registered and EPS/IMSI attached UE can not initiate an IMS voice session or SMS (because e.g. IMS voice services are not supported by the serving IP-CAN or UE) CS fallback should be applied for voice calls and/or SMS.

10 10 TS V8.0.0 ( ) 5 Mobility Management 5.1 General The CS fallback in EPS is realized by reusing the Gs interface mechanism between the MSC Server and the MME. 5.2 Attach procedure The attach procedure for the CS fallback in EPS is realized based on the combined GPRS/IMSI Attach procedure specified in TS [3]. UE MME MSC/VLR HSS 1.Attach 2. Attach as specified in TS Derive MSC address 4. Location Update 5. Create SGs association 6. Location update in CS domain 8. Attach Accept 7. Location Update Accept Figure 5.2-1: Attach Procedure 1) The MS initiates the attach procedure by the transmission of an Attach Request (parameters as specified in TS [2], CS fallback indicator) message to the MME. The CS fallback indicator indicates that the UE is capable and configured to use CS fallback. 2) The EPS Attach procedure is performed as specified in TS [2]. 3) The VLR shall be updated according to the combined GPRS/IMSI Attach procedure in TS [3] if Attach Request message includes the Combined Update indicator. The VLR number is derived from the TAI. The MME starts the location update procedure towards the new MSC/VLR upon receipt of the first Insert Subscriber Data message from the HSS in step 2). This operation marks the MS as EPS-attached in the VLR. 4) The MME sends a Location Update Request (new LAI, IMSI, MME address, Location Update Type) message to the VLR. New LAI is determined in MME based on mapping from the TA. A mapped LAI could be either GERAN or UTRAN based on an operator configuration. MME address is an IP address. 5) The VLR creates an association with the MME by storing MME address. 6) The VLR performs Location Updating procedure in CS domain. 7) The VLR responds with Location Update Accept (VLR TMSI) to the MME. 8) The MME sends an Attach Accept (parameters as specified in TS [2], LA, VLR TMSI) message to the UE. The existence of LA and VLR TMSI indicates successful attach to CS domain. NOTE: The case of unsuccessful attach to CS domain is documented in stage 3 specifications, taking into account reachability for CS services of UEs that have the user preference to prioritize voice over data services and are not configured/supporting to use IMS voice services.

11 11 TS V8.0.0 ( ) 5.3 Detach procedure UE-initiated Detach procedure The UE-initiated Detach procedure for the CS fallback in EPS is realized based on the MS-Initiated Detach Procedure specified in TS [3]. UE MME MSC/VLR HSS 1.Detach 2. UE-initiated detach as specified in TS IMSI Detach Indication (IMSI) message 5. Detach accept 4. Remove Gs association Figure : UE-initiated Detach Procedure 1) The UE initiates the detach procedure by the transmission of a Detach Request (parameters as specified in TS [2], Detach Type) message to the MME. Detach Type indicates which type of detach is to be performed, i.e., IMSI Detach only or combined EPS and IMSI Detach. 2) If EPS detach is indicated in step 1, the EPS Detach procedure is performed as specified in TS [2]. 3) The MME sends an IMSI Detach Indication (IMSI) message to the VLR. 4) The VLR removes the association with the MME. 5) The MME sends a Detach accept message as specified in TS [2] MME-initiated Detach procedure The MME-initiated detach procedure for the CS fallback in EPS is realized based on the SGSN-Initiated Detach Procedure specified in TS [3].

12 12 TS V8.0.0 ( ) UE MME MSC/VLR HSS 1.MME-initiated detach as specified in TS IMSI Detach Indication (IMSI) message 3. Remove Gs association Figure : MME-initiated Detach Procedure 1) The MME-initiated Detach procedure is performed as specified in TS [2]. 2) The MME sends an IMSI Detach Indication (IMSI) message to the VLR. 3) The VLR removes the association with the MME HSS-initiated Detach procedure The HSS-initiated detach procedure for the CS fallback in EPS is realized based on the HLR-Initiated Detach Procedure specified in TS [3]. UE MME MSC/VLR HSS 1. HSS-initiated detach as specified in TS IMSI Detach Indication (IMSI) message 3. Remove Gs association Figure : HSS-initiated Detach Procedure 1) The HSS-initiated Detach procedure is performed as specified in TS [2]. 2) The MME sends an IMSI Detach Indication (IMSI) message to the VLR. 3) The VLR removes the association with the MME.

13 13 TS V8.0.0 ( ) 5.4 TA/LA Update procedure Combined TA/LA Update Procedure NOTE: The combined TA/LA Update procedure for the CS fallback in EPS is realized based on the combined RA/LA Update procedure specified in TS [3]. UE new MME old MME MSC/VLR HSS 1. UE determines to perform TAU 2.TAU 3. TAU as specified in TS Location Update 5. Location update in CS domain 7. TAU Accept 6. Location Update Accept Figure : Combined TA / LA Update Procedure 1) The UE detects a change to a new TA by discovering that its current TAI is not in the list of TAIs that the UE registered with the network. The combined TA/LA Update Procedure is also performed in order to re-establish the SGs association. Therefore, when the UE performed a LAU (which releases the SGs association) and enters ECM_IDLE state in an area that requires combined TA/LA Updates, then the UE performs a combined TA/LA Update. 2) The UE initiates the TAU procedure by sending a TAU Request (parameters as specified in TS [2], CS fallback indicator) message to the MME. The CS fallback indicator indicates that this is a combined Tracking Area/Location Area Update Request message. 3) The EPS TAU procedure is performed as specified in TS [2]. 4) If there is an associated VLR in the MM context, the VLR also needs to be updated. If the association has to be established or if the LA changed, the new MME sends a Location Update Request (new LAI, IMSI, MME address, Location Update Type) message to the VLR. New LAI is determined in the MME based on mapping from the TA. Location Update Type shall indicate normal location update. The VLR number is derived from the TAI. MME address is an IP address. 5) The VLR performs Location Update procedure in CS domain. 6) The VLR responds with Location Update Accept (VLR TMSI) to the MME. 7) The MME sends a TAU Accept (parameters as specified in TS [2], LAI, VLR TMSI) message to the UE. The VLR TMSI is optional if the VLR has not changed. When the MME allocates the TA list to the UE, the TA list shall be configured ensuring that all TAs in the TA list belong to the same LA Periodic TA and LA Update Procedure When the UE is camped in the E-UTRAN, periodic LA updates shall not be performed. In this case the MSC/VLR shall disable implicit detach for EPS-attached UEs and instead rely on the MME to receive periodic TA updates. If periodic TA updates are not received in the MME and the MME detaches the UE, the MME shall notify the MSC/VLR by sending an IMSI Detach Indication message.

14 14 TS V8.0.0 ( ) If the UE is both EPS/IMSI and GPRS/IMSI attached, the UE shall initiate combined periodic TA/LA or RA/LA update procedure. 6 Mobile Originating Call 6.1 General This clause describes the mobile originating call procedures for the CS Fallback in EPS. 6.2 Mobile Originating call in Active Mode - PS HO supported UE/MS enodeb BSS/RNC MME MSC SGSN Serving GW 1a. Service Request 1b. S1 Initial UE Context Setup 2. Optional Measurement Report Solicitation 3. PS HO as specified in [2] 4. SABM (with CM Service Request) 4a. Complete Layer 3 Information (with CM Service Request) 4. UA (with CM Service Request) 5. Service Reject 5. Service Reject If the MSC Location Area Update is changed 6. CS call establishment procedure 7. Forward Relocation Complete 7. Forward Relocation Complete Ack 8. Update PDP Context Request IP Packets to Serving GW 8. Update PDP Context Response IP Packets to SGSN 9. XID Negotiation for LLC ADM 9a. XID Negotiation for LLC ABM 10. Routing Area Update Procedure Figure 6.2-1: CS Call Request in E-UTRAN, Call in GERAN/UTRAN

15 15 TS V8.0.0 ( ) NOTE 1: For simplicity, figure includes some messages which are only applicable to GERAN access (e.g. SABM, UA and XID negotiation). In case of UTRAN access, the applicable messages can be found in the E-UTRAN to UTRAN inter-rat HO procedures specified in TS [2]. NOTE 2: Steps 1a and 1b need to be further investigated in CT1 considering aspects such as speed and complexity. 1a. UE sends Service Request (CS Fallback Indicator) to MME. Service Request message is encapsulated in RRC and S1-AP messages. CS Fallback Indicator indicates MME to perform CS Fallback. The UE only transmits this request if it is attached to CS domain (with a combined EPS/IMSI Attach) and can not initiate an IMS voice session (because e.g. the UE is not IMS registered or IMS voice services are not supported by the serving IP-CAN, home PLMN or UE). 1b. MME sends S1-AP: Initial UE Context Setup (UE capabilities, CS Fallback Indicator) to indicate the enb to move the UE to UTRAN/GERAN. 2. The enode may optionally solicit a measurement report from the UE to determine the target GERAN/UTRAN cell to which PS handover will be performed. 3. The enodeb triggers PS handover to a GERAN/UTRAN neighbour cell by sending a Relocation Required message. In the following a PS HO as specified in TS [2] takes place. 4. Target RAT is UTRAN: As soon as the UE completes the PS HO procedure the UE establishes an RRC connection and responds to the paging in an RRC Initial Direct Transfer message as specified in TS [7]. CN Domain Indicator is set to "CS" in the Initial Direct Transfer message. Target RAT is GERAN: As soon as the UE completes the PS HO procedure the UE establishes an RR connection using legacy procedures (i.e. UE requests and is assigned a dedicated channel where it sends a SABM containing a layer 3 Service Request message = PAGING RESPONSE to the BSS) and the BSS responds by sending a UA. Upon receiving the SABM (containing a PAGING RESPONSE message) the BSS sends a COMPLETE LAYER 3 INFORMATION message (containing a PAGING RESPONSE message) to the MSC which indicates CS resources have been allocated in the GERAN cell. After the establishment of the main signalling link as described in TS [6] the UE enters either Dual Transfer Mode or Dedicated Mode and the CS call establishment procedure completes. NOTE 3: Whether or not the page response requires a CSFB indicator needs to be considered by stage In case the MSC serving the 2G/3G cell is different from the MSC that served the UE while camped on LTE, the MSC shall reject the service request, if implicit location update is not performed. The service reject shall trigger the UE to perform a Location Area Update as follows: - If the target system operates in Network Mode of Operation (NMO) I the UE shall perform a combined RA/LA update, as defined in TS [3] - If the target system operates in NMO II or III the UE performs a Location Area Update towards the MSC. 6. The UE initiates the CS call establishment procedure. 7. Upon receiving the PS Handover Complete message (part of step 3), the SGSN sends a Forward Relocation Complete message to the MME to indicate completion of the PS handover procedures. The MME responds with a Forward Relocation Complete Acknowledge message. 8. The SGSN sends an Update PDP Context Request (new SGSN Address, TEID, QoS Negotiated) message to the Serving GW concerned. The Serving GW updates the PDP context fields and returns an Update PDP Context Response (TEID) message. From now on the Serving GW sends new incoming downlink IP packets to the SGSN instead of to the Source enodeb. NOTE 4: The additional steps of the Update Bearer Request - Update Bearer Response exchange between the Serving GW and PDN GW are not shown but will be performed as per the equivalent steps in TS [2]. 9. If the SGSN indicated Reset (i.e. reset to default parameters) in the NAS container for PS HO included in the Handover from eutran Command message then on receipt of the PS Handover Complete the SGSN initiates an LLC/SNDCP XID negotiation for each LLC SAPI used in LLC ADM. In this case if the SGSN wants to use the default parameters, it shall send an empty XID Command. If the SGSN indicated 'Reset to the old XID

16 16 TS V8.0.0 ( ) parameters' in the NAS container for PS HO, no further XID negotiation is required for LLC SAPIs used in LLC ADM only. The SGSN (re-)establishes LLC ABM for the PDP contexts which use acknowledged information transfer. During the exchange of SABM and UA the SGSN shall perform LLC/SNDCP XID negotiation. 10. The UE may trigger the Routing Area Update procedure when the sending of uplink packet data is possible. The detailed steps performed are as per TS [2]. 6.3 Mobile Originating call in Active Mode No PS HO support in GERAN UE/MS enodeb BSS MME MSC S-GW 1a. Service Request 1b. S1 Initial UE Context Setup 2. Optional Measurement Report Solicitation 3. NACC 4. S1-AP: S1 UE Context Release Request 5. Suspend Request 6. Suspend Request Ack 7. S1 UE Context Release 8. Location Area Update 9. CS MO call 10a. Service Reject 10b. Location Area Update 10c. CS MO call In case MSC rejects the Service Request changed Figure 6.3-1: CS Call Request in E-UTRAN, Call in GERAN NOTE: Steps 1a and 1b need to be further investigated in CT1 considering aspects such as speed and complexity. 1a. The UE sends a Serivce Request (CS Fallback Indicator) to the MME. Service Request message is encapsulated in RRC and S1-AP messages. CS Fallback Indicator indicates MME to perform CS Fallback. The UE only transmits this request if it is attached to CS domain (with a combined EPS/IMSI Attach) and can not initiate an IMS voice session (because e.g. the UE is not IMS registered or IMS voice services are not supported by the serving IP-CAN, home PLMN or UE). 1b. MME sends S1-AP: Initial UE Context Setup (UE capabilities, CS Fallback Indicator) to indicate the enb to move the UE to UTRAN/GERAN. 2. The enode may optionally solicit a measurement report from the UE to determine the target GERAN cell to which PS handover will be performed. 3. The enodeb triggers an inter-rat cell change order (optionally with NACC) to a GERAN neighbour cell by sending an RRC message to the UE. 4. The enodeb sends an S1 UE Context Release Request (Cause) message to the MME. Cause indicates that the UE is not available for the PS service.

17 17 TS V8.0.0 ( ) 5. The MME sets the UE context to suspended status and sends to the S-GW a Suspend Request (IMSI) message that requests the suspension of EPS bearers for the UE. 6. The S-GW acknowledges the Suspend Request message and marks the UE as suspended. When a downlink data packet for the UE arrives at the S-GW, the S-GW should not send a downlink data notification message to the MME if the UE is marked as suspended. 7. S1 UE Context in the enodeb is released as specified in TS [2]. 8. The UE moves to the new RAT and establishes an RR connection using legacy procedures. If the UE obtains LA information of the new cell (e.g. based on the system information) and the LA of the new cell is different from the one stored in the UE, it performs a Location Area Update. 9. The UE continues with the MO call setup procedure. 10a. In case the MSC serving the 2G/3G cell is different from the MSC that served the UE while camped on LTE, the MSC shall reject the call setup service request, if implicit location update is not performed. 10b. A UE detecting that the MSC rejected the service request shall perform the Location Area Update according to existing GERAN or UTRAN procedures. 10c. After completion of the Location Area Update the UE continues with a MO call setup procedure. 6.4 Mobile Originating call in Idle Mode Mobile Originating call in Idle Mode procedure is specified by reusing the Mobile Originating Call in Active mode procedure with the following modifications: - Target RAT has no PS HO capability: The UE sends Service Request (CS Fallback Indicator)to MME. Service Request message is encapsulated in RRC and S1-AP messages. CS Fallback Indicator indicates MME to perform CS Fallback. NOTE: The above procedure needs to be further investigated in CT1 considering aspects such as speed and complexity. - The UE then awaits further instructions from the serving enodeb, e.g. the S1 connection is established to get the UE capabilities downloaded from the MME to the enb and the RRC connection is released with a redirection info to change to CS capable RATs (RAT, frequency, cell info), optionally based on measurements. As an option the inter-rat system information might be provided by the enb using the NACC procedure for GERAN. - Target RAT has PS HO capability: The enodeb may choose to invoke the optional Measurement Report Solicitation during the preparation phase so that the UE is at minimum informed that its CS Call Request has been accepted and a PS Handover is pending (i.e. so it can implicitly perform a state transition to Active mode). The execution phase is the same as for the Mobile Originating Call in Active mode except that there are no incoming IP packets to be delivered to the UE. 6.5 Returning back to E-UTRAN Once CS service ends in CS domain, existing mechanisms can be used to move the UE to E-UTRAN, no specific CS Fallback mechanisms are needed. When the UE moves to E-UTRAN, if the EPS service was suspended during the CS service, it is resumed according to the procedure shown in the figure below.

18 18 TS V8.0.0 ( ) UE/MS enodeb MME S-GW 1. NAS message 2. Resume Request 3. Resume Request Ack 4. Handling NAS message Figure 6.5-1: Resume Procedure returning from CS fallback no PS HO 1. The UE sends a NAS message, e.g. Service Request or TAU, to the MME. 2. If the UE context in the MME indicates that UE is in suspended status, the MME sends a Resume Request (IMSI) message to the S-GW that requests the resumption of EPS bearers for the UE. 3. The S-GW acknowledges the Resume Request and clears the UE's suspending status. 4. The NAS message is processed accordingly. 7 Mobile Terminating Call 7.1 General This clause describes the mobile terminating call procedures for the CS Fallback in EPS. 7.2 Mobile Terminating call in idle mode The procedure for Mobile Terminating Call in idle mode is illustrated in figure

19 19 TS V8.0.0 ( ) UE enodeb MME MSC RNC/BSC VLR HSS G-MSC 1. IAM 2. SRI procedure in TS Paging 5. Paging 4. Paging 3. IAM 7a. Service Request 7b. Initial UE Context Setup 8a. PS handover 8b. enb assisted cell change 8c. Location Area Update 8d. Paging Response 8d. Paging Response 9a. Establish CS connection Option 1: MSC is not changed 9b. RRC Release 9b. Connection Reject Location Area Update and Roaming Retry for CS Fallback (clause 7.5) Option 2: MSC is changed Figure 7.2-1: Mobile Terminating Call in idle mode NOTE 1: Steps 7a and 7b need to be further investigated in CT1 considering aspects such as speed and complexity. 1. G-MSC receives IAM. 2. G-MSC retrieves routing information of the terminating UE by Send Routing Info procedures as specified in TS [5]. 3. G-MSC sends IAM to the MSC on the terminating side as specified in TS [5]. 4. The MME receives a Page (IMSI, VLR TMSI, Location Information) message from the MSC over a SGs interface. If VLR TMSI is omitted, the IMSI is used instead of the TMSI as a paging address at the radio interface. If location information is reliably known by MME (i.e. MME stores the list of TAs), the MME shall page the UE in all the TAs. If the MME does not have a stored TA list for the UE, the MME should use the location information received from the MSC to page the UE. 5. The MME sends a Paging (as specified in TS [2], and CN Domain Indicator) message to each enodeb. CN Domain Indicator indicates which domain (CS or PS) initiated the paging message, and in this case it must be set to "CS" by the MME. 6. The radio resource part of the paging procedure takes place. The message contains CN Domain indicator. 7a. UE sends Service Request (CS Fallback Indicator) to MME. Service Request message is encapsulated in RRC and S1-AP messages. CS Fallback Indicator indicates MME to perform CS Fallback. 7b. MME sends S1-AP: Initial UE Context Setup (UE capabilities, CS Fallback Indicator) to indicate the enb to move the UE to UTRAN/GERAN. 8a. Target RAT has PS HO capability: Upon receipt of a Paging Request message for a circuit-switched service the enb sets up an RRC Connection with the UE and may optionally solicit a measurement report from the UE to determine the target cell to which PS handover will be performed. PS handover is then performed as specified in TS [2].

20 20 TS V8.0.0 ( ) 8b. Target RAT has no PS HO capability Upon receipt of a Paging Request message for a circuit-switched service the UE sets up an RRC Connection with E-UTRAN, the S1 connection is established to get the UE capabilities downloaded from the MME to the enb and the RRC connection is released with a redirection info to change to CS capable RATs (RAT, frequency, cell info), optionally based on measurements. As an option the inter-rat system information might be provided by the enb using the NACC procedure for GERAN. 8c. If the UE obtains LA information of the new cell (e.g. based on the system information or redirection info) and the LA of the new cell is different from the one stored in the UE, it performs a Location Area Update. 8d. The UE responds with a page response message to the MSC: - If Target RAT is UTRAN: the UE establishes an RRC connection and responds to the paging in an RRC Initial Direct Transfer message as specified in TS [7]. CN Domain Indicator is set to "CS" in the Initial Direct Transfer message. When received at the RNC, the Paging Response message is sent in an RANAP Initial UE message to the MSC. - If Target RAT is GERAN: the UE establishes an RR connection using legacy procedures (i.e. UE requests and is assigned a dedicated channel where it sends a SABM containing a layer 3 Service Request message = PAGING RESPONSE to the BSS and the BSS responds by sending a UA). After the establishment of the main signalling link as described in TS [4] the UE enters either Dual Transfer Mode or Dedicated Mode and the CS call establishment procedure completes. When received at the BSC, the Paging Response message is sent in a BSSAP COMPLETE LAYER 3 INFORMATION message to the MSC as specified in TS [6]. NOTE 2: Whether or not the page response requires a CSFB indicator needs to be considered by stage 3. 9a. In case the MSC serving the 2G/3G cell is the same as the MSC that served the UE while camped on LTE, it shall stop the paging response timer and establish the CS connection. 9b. Otherwise (if the MSC that receives the paging response is different from the MSC that sent the paging request), the MSC shall reject the page response message by releasing the Iu connection for UTRAN or the A/Gb connection for GERAN. The BSC/RNC in turn releases the RRC connection for UTRAN or the RR connection for GERAN. The RRC/RR release shall trigger the UE to perform a Location Area Update as follows: - If the target system operates in Network Mode of Operation (NMO) I the UE shall perform a combined RA/LA update, as defined in TS [3]. - If the target system operates in NMO II or III the UE performs a Location Area Update towards the MSC. The Location Area Update triggers the Roaming Retry for CS Fallback procedure as defined in clause 7.5.

21 21 TS V8.0.0 ( ) 7.3 Mobile Terminating call in Active Mode - PS HO supported UE enodeb BSS/RNC MME MSC SGSN Serving GW 1a. CS Page 1a. CS Page 1b. Service Request 1c. CS Page Reject 1d. S1 Initial UE Context Setup 2. Optional Measurement Report Solicitation 3. PS HO as specified in TS [2] 4. SABM (with Paging Response) 4. UA (with Paging Response) 4a. Complete Layer 3 Information (with Paging Response) 5a. RRC Release 5a. Connection Reject Location Area Update and Roaming Retry for CS Fallback (clause 7.5) Option 1: MSC is changed 5b. CS call establishment procedure 6. Forward Relocation Complete 6. Forward Relocation Complete Ack Option 2: MSC is not changed 7. Update PDP Context Request IP Packets to Serving GW 7. Update PDP Context Response 8. XID Negotiation for LLC ADM IP Packets to SGSN 8a. XID Negotiation for LLC ABM 9. Routing Area Update Procedure Figure 7.3-1: CS Page in E-UTRAN, Call in GERAN/UTRAN Preparation Phase NOTE 1: For simplicity, figure includes some messages which are only applicable to GERAN access (e.g. SABM, UA and XID negotiation). In case of UTRAN access, the applicable messages can be found in the E-UTRAN to UTRAN inter-rat HO procedures specified in TS [2]. NOTE 2: Steps 1b and 1c need to be further investigated in CT1 considering aspects such as speed and complexity. NOTE 3: The addition of Caller Line Identification functionality needs to be evaluated further and may need to be revised and/or removed from this specification. 1a. The MSC receives an incoming voice call and responds by sending a CS Page (IMSI or TMSI, optional Caller Line Identification and Connection Management information) to the MME over a SGs interface. In active mode the MME has an established S1 connection and the MME reuses the existing connection to relay the CS Page to the UE. The MSC only sends a CS Page for an UE that provides location update information using the SGs interface. The enb forwards the paging message to the UE. The message contains CN Domain indicator and Caller Line Identification if available and needed. Note that the pre-configured policy may be used by UE to avoid being disturbed without Caller Line Identification display and the detailed handling is to be decided by CT1 and CT6.

22 22 TS V8.0.0 ( ) 1b. UE sends Service Request to MME. Service Request message is encapsulated in RRC and S1-AP messages. CS Fallback Indicator indicates MME to perform CS Fallback. The UE may decide to reject CSFB based on Caller Line Identification. The UE sends Service Request (CS Fallback Indicator, Reject or Accept) message towards the MME. 1c. Upon receiving the Service request (CSFB, Reject), the MME sends CS Paging Reject towards MSC to stop CS Paging procedure and this CSFB procedure stops. 1d. MME sends S1-AP: Initial UE Context Setup (UE capabilities, CS Fallback Indicator) to indicate the enb to move the UE to UTRAN/GERAN. 2. The enodeb may optionally solicit a measurement report from the UE to determine the target GERAN/UTRAN cell to which PS handover will be performed. 3. The enodeb triggers PS handover to a GERAN/UTRAN neighbour cell by sending a Relocation Required message. In the following a PS HO as specified in TS [2] takes place. 4. Target RAT is UTRAN: As soon as the UE completes the PS HO procedure the UE establishes an RRC connection and responds to the paging in an RRC Initial Direct Transfer message as specified in TS [7]. CN Domain Indicator is set to "CS" in the Initial Direct Transfer message. Target RAT is GERAN: As soon as the UE completes the PS HO procedure the UE establishes an RR connection using legacy procedures (i.e. UE requests and is assigned a dedicated channel where it sends a SABM containing a layer 3 Service Request message = PAGING RESPONSE to the BSS) and the BSS responds by sending a UA. Upon receiving the SABM (containing a PAGING RESPONSE message) the BSS sends a COMPLETE LAYER 3 INFORMATION message (containing a PAGING RESPONSE message) to the MSC which indicates CS resources have been allocated in the GERAN cell. After the establishment of the main signalling link as described in TS [6] the UE enters either Dual Transfer Mode or Dedicated Mode and the CS call establishment procedure completes. NOTE 4: Whether or not the page response requires a CSFB indicator needs to be considered by stage 3. 5a. In case the MSC serving the 2G/3G cell is different from the MSC that served the UE while camped on LTE, the MSC shall reject the page response message by releasing the Iu connection for UTRAN or the A/Gb connection for GERAN. The BSC/RNC in turn releases the RRC connection for UTRAN or the RR connection for GERAN. The RRC/RR release shall trigger the UE to perform a Location Area Update as follows: - If the target system operates in Network Mode of Operation (NMO) I the UE shall perform a combined RA/LA update, as defined in TS [3] - If the target system operates in NMO II or III the UE performs a Location Area Update towards the MSC. The Location Area Update triggers the Roaming Retry for CS Fallback procedure as defined in clause b. Otherwise (if the MSC receiving the paging response is the same as the MSC that sent the paging message), the UE initiates the CS call establishment procedure. 6. Upon receiving the PS Handover Complete message (part of step 3), the SGSN send a Forward Relocation Complete message to the MME to indicate completion of the PS handover procedures. The MME responds with a Forward Relocation Complete Acknowledge message. 7. The SGSN sends an Update PDP Context Request (new SGSN Address, TEID, QoS Negotiated) message to the Serving GW concerned. The Serving GW updates the PDP context fields and returns an Update PDP Context Response (TEID) message. From now on the Serving GW sends new incoming downlink IP packets to the SGSN instead of to the source enodeb. NOTE 5: The additional steps of the Update Bearer Request - Update Bearer Response exchange between the Serving GW and PDN GW are not shown but will be performed as per the equivalent steps in TS [2]. 8. If the SGSN indicated Reset (i.e. reset to default parameters) in the NAS container for PS HO included in the Handover from eutran Command message then on receipt of the PS Handover Complete the SGSN initiates an LLC/SNDCP XID negotiation for each LLC SAPI used in LLC ADM. In this case if the SGSN wants to use the default parameters, it shall send an empty XID Command. If the SGSN indicated 'Reset to the old XID

23 23 TS V8.0.0 ( ) parameters' in the NAS container for PS HO, no further XID negotiation is required for LLC SAPIs used in LLC ADM only. The SGSN (re-)establishes LLC ABM for the PDP contexts which use acknowledged information transfer. During the exchange of SABM and UA the SGSN shall perform LLC/SNDCP XID negotiation. 9. The UE may trigger the Routing Area Update procedure when the sending of uplink packet data is possible. The detailed steps performed are as per TS [2]. 7.4 Mobile Terminating call in Active Mode - No PS HO support in GERAN UE/MS enodeb BSS MME MSC S-GW 1b. Service Request 1a. CS Page 1d. S1 Initial UE Context Setup 1a. CS Page 1c. CS Page Reject 2. Optional Measurement Report 3. NACC 4. S1-AP: S1 UE Context Release Request 5. Suspend Request 6. Suspend Request Ack 7. S1 UE Context Release 8. Location Area Update 9. Paging Response 9. Paging Response 10. Establish CS connection Option 1: MSC is not changed 11. RRC Release 11. Connection Reject Option 2: MSC is Location Area Update and Roaming Retry for CS Fallback (clause 7.5) changed Figure 7.4-1: CS Page in E-UTRAN, Call in GERAN without PS HO NOTE 1: Steps 1b and 1c need to be further investigated in CT1 considering aspects such as speed and complexity. NOTE 2: The addition of Caller Line Identification functionality needs to be evaluated further and may need to be revised and/or removed from this specification. 1a. The MSC receives an incoming voice call and responds by sending a CS Page (IMSI or TMSI, optional Caller Line Identification and Connection Management information) to the MME over a SGs interface. In active mode the MME has an established S1 connection and the MME reuses the existing connection to relay the CS Page to the UE. The MSC only sends a CS Page for an UE that provides location update information using the SGs interface. The enb forwards the paging message to the UE. The message contains CN Domain indicator and Caller Line Identification if available and needed. Note that the pre-configured policy may be used by UE to avoid being disturbed without Caller Line Identification display and the detailed handling is to be decided by CT1 and CT6. 1b. UE sends Service Request (CS Fallback Indicator) to the MME. Service Request message is encapsulated in RRC and S1-AP messages. CS Fallback Indicator indicates MME to perform CS Fallback. The UE may decide

24 24 TS V8.0.0 ( ) to reject CSFB based on Caller Line Identification. The UE sends Service Request (CS Fallback Indicator, Reject or Accept) message towards the MME. 1c. Upon receiving the Service Request (CSFB, Reject), the MME sends CS Paging Reject towards MSC to stop CS Paging procedure and this CSFB procedure stops. 1d. Service Accept message is encapsulated in S1-AP: Initial UE Context Setup (NAS message, UE capabilities, CS Fallback Indicator) to indicate the enb to move the UE to UTRAN/GERAN. 2. The enodeb may optionally solicit a measurement report from the UE to determine the target GERAN cell to which the redirection procedure will be performed. 3. The enodeb triggers an inter-rat cell change order (optionally with NACC) to a GERAN neighbour cell by sending an RRC message to the UE. 4. The enodeb sends an S1 UE Context Release Request (Cause) message to the MME. Cause indicates that the UE is not available for PS service. 5. The MME sets the UE context to suspended status and sends to the S-GW a Suspend Request (IMSI) message that requests the suspension of EPS bearers for the UE. 6. The S-GW acknowledges the Suspend Request message and marks the UE as suspended. When a downlink data packet for the UE arrives at the S-GW, the S-GW should not send a downlink data notification message to the MME if the UE is marked as suspended. 7. S1 UE Context in the enodeb is released as specified in TS [2]. 8. The UE moves to the new RA, establishes an RR connection using legacy procedures as described in TS [12]. If the UE obtains LA information of the new cell (e.g. based on the system information) and the LA of the new cell is different from the one stored in the UE, it performs a Location Area Update. 9. The UE responds to the paging by sending a Paging Response message as specified in TS [4]. When received at the BSS, the Paging Response is sent in a BSSAP COMPLETE LAYER 3 INFORMATION message to the MSC. NOTE 3: Whether or not the page response requires a CSFB indicator needs to be considered by stage In case the MSC serving the 2G/3G cell is the same as the MSC that served the UE while camped on LTE, it shall then stop the paging response timer and establish the CS connection. 11. Otherwise (if the MSC that receives the paging response is different from the MSC that sent the paging request), the MSC shall reject the page response message by releasing the A/Gb connection. The BSS in turn releases the RR connection. The RR release shall trigger the UE to perform a Location Area Update. The Location Area Update triggers the Roaming Retry for CS Fallback procedure as defined in clause Roaming Retry for CS fallback The procedure in this section is applied for mobile terminated calls where the MSC, to which the UE sends the LAU, is different from the MSC that sent the paging message to the UE. The procedure is based on the Mobile Terminating Roaming Retry Call procedure defined in TS [5] and there is an only minor adaptation of the procedure to support CS fallback. NOTE: At CS fallback the UE will always perform a location update procedure in the 2G or 3G RAT before sending a Page response. Hence, the MSC will always receive the Location Update before a page response.

25 25 TS V8.0.0 ( ) GMSC HLR Old VMSC/VLR New VMSC/VLR SRI (B, Ref.,Roamingretry) 1 PRN (call ref.,gmsc@, Roaming retry) 2 PRN ACK (MSRN) SRI ACK IAM (MSRN) Paging SAE/LTE CSFallback MS LocUpdate ACK Authentication Procedure Update Location Cancel Location 3 Cancel Location Ack Old MSC stops paging timer and inform GMSC Insert Subscriber Data (multiple) RCH (call reference, roaming retry) REL RLCs 4 2nd SRI (B, basic call interrogation) 5 HLR delays the sending of PRN until location update procedure finishes 6 2nd SRI ACK (MSRN) 7 Insert Subscriber Data (continued) Update Location Ack PRN PRN ACK (MSRN) 7 IAM (MSRN) Further procedures related to location update. e.g. ciphering, TMSI reallocation. New VMSC/VLR may delay setup until location update procedure finishes 8 LocUpdate Accept TMSI Cmplt Paging response Normal MT call procedure follows. Figure 7.5-1: Roaming Retry for CS fallback There are only 2 differences in this procedure compared to the Mobile Terminating Roaming Retry Call procedure defined in TS [5]. The first difference is that the paging message triggers the CS fallback including a location update in the new RAT. This functionality is already supported in the CS fallback flows for terminating calls and no additional functionality is needed. The second difference is that the UE may send a page response message after receiving Location Update Accept message. The new MSC will ignore or reject the page response message. 7.6 Returning back to E-UTRAN Once CS service ends in CS domain, existing mechanisms can be used to move the UE to E-UTRAN, no specific CS Fallback mechanisms are needed. When the UE moves to E-UTRAN, if the EPS service was suspended during the CS service, it is resumed as specified in clause 6.5.

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