| Building Block: R99 Charging | Charging | R99 |
| Work task: Circuit Switched Bearer Services | Circuit_switched_Bearer_Services | R99 |
| Work task: Stage 1 for Circuit Switched Bearer Services | CS_Bearerss_in_UMTS | R99 |
| Work task: Enhanced Circuit Switched Data - Phase 1 | ECSD | R99 |
| Feature or Study Item: Emergency | Emergency | R99 |
| Building Block: Follow_Me service | Follow_Me | R99 |
| Building Block: Customised Application for Mobile network Enhanced Logic Phase 3 | CAMEL3 | R99 |
| Building Block: UMTS Capabilities | UMTS_Capabil | R99 |
| Building Block: Location Services | LCS | R99 |
| Building Block: Mobile Station Execution Environment | MExE | R99 |
| Feature or Study Item: Man-Machine Interface (MMI) of the User Equipment (UE) | MMI | R99 |
| Feature or Study Item: Deleted - Operator Determined Barring for Packet Oriented Services | ODB_Enh. | R99 |
| Work task: General Packet Radio Service | GPRS | R99 |
| Building Block: LCS support in the PS domain | LCS4-PS | Rel-4 |
| Feature or Study Item: Global Text Telephony | GTT | Rel-4 |
| Feature or Study Item: Real Time Facsimile | FAX-RT | Rel-4 |
| Feature or Study Item: Presence Capability | PRESNC | Rel-6 |
| Feature or Study Item: Multimedia Broadcast and Multicast Service | MBMS | Rel-6 |
| Feature or Study Item: Enhancement of dialled service for CAMEL | EDCAMEL | Rel-6 |
| Feature or Study Item: CAMEL prepay interworking with SCUDIF | SCCAMEL | Rel-6 |
| Feature or Study Item: Packet Switched Streaming Services Rel-6 | PSSrel6 | Rel-6 |
| Feature or Study Item: Supporting Globally Routable User Agent URIs in IMS | GRUU | Rel-7 |
| Work task: FS on 3GPP system to WLAN Interworking with LCS | LCS3-IWLAN-FSs1 | Rel-7 |
| Feature or Study Item: Location Services enhancements | LCS3 | Rel-7 |
| Building Block: Stage 1 for USSD message delivery and transfer to USIM | USSD-USIM | Rel-7 |
| Building Block: Stage 1 for Enhancements of VGCS for public authority officials | EVGCS | Rel-7 |
| Feature or Study Item: WLAN-UMTS Interworking Phase 2 | WLAN2 | Rel-7 |
| Feature or Study Item: Combinational Services | CSICS | Rel-7 |
| Building Block: Stage 1 for CSICS | CSICS | Rel-7 |
| Feature or Study Item: CAMEL Trunk Triggers | TTCAMEL | Rel-7 |
| Building Block: Stage 1 for CAMEL Trunk Triggers | TTCAMEL | Rel-7 |
| Feature or Study Item: Study on Multimedia Priority Service | PRIOR-MM | Rel-7 |
| Building Block: Stage 1 of MBMSE | MBMSE | Rel-7 |
| Feature or Study Item: TISPAN requirements for Multimedia Telephony with PSTN/ISDN simulation services | TMMTEL7 | Rel-7 |
| Building Block: SA1,SA2 part of Maintenance of TISPAN release 1 common IMS | IMS_Comm_Mtce7 | Rel-7 |
| Building Block: SA1 aspects of MCIMSTR1 | MCIMSTR1-S1 | Rel-7 |
| Building Block: Stage 1 for ICE | ICE | Rel-8 |
| Building Block: Stage 1 for I-WLAN NSP | IWLANNSP | Rel-8 |
| Feature or Study Item: 3GPP2 Input to Common IMS | CIMS_3GPP2 | Rel-8 |
| Building Block: Stage 1 for CHRGMPH | CHRGMPH-s1 | Rel-8 |
| Feature or Study Item: Home NodeB / eNodeB | HomeNB | Rel-8 |
| Building Block: Stage 1 for CAT | CAT | Rel-8 |
| Building Block: TISPAN requirements for customized multimedia information services | TISCMI | Rel-8 |
| Feature or Study Item: Deleted - equals 340035 -FS on Service continuity between mobile and WLAN networks | FSSCMobToW | Rel-8 |
| Feature or Study Item: Earthquake and Tsunami Warning System | ETWS | Rel-8 |
| Building Block: Stage 1 for ETWS | ETWS | Rel-8 |
| Feature or Study Item: Deleted - IMS Enhancements Rel-8 | IMS8 | Rel-8 |
| Feature or Study Item: IMS Multimedia Telephony and Supplementary Services | IMSTSS | Rel-8 |
| Building Block: General aspects of IMS Sup Services | IMSSS-Gal | Rel-8 |
| Building Block: IMS Multimedia Telephony Service | IMS-MMTel | Rel-8 |
| Building Block: eData Requirements | EData | Rel-8 |
| Building Block: Stage 1 for PPACR | PPACR-S1 | Rel-8 |
| Feature or Study Item: Study on Services Alignment and Migration | FS_ServAl | Rel-8 |
| Building Block: Study on centralized IMS services requirements | FS_ICS-S1 | Rel-8 |
| Feature or Study Item: Open Service Access (OSA) Rel-8 | OSA8 | Rel-8 |
| Building Block: Stage 1 for MESSIW | MESSIW | Rel-8 |
| Feature or Study Item: Study on Requirements of IMS Multimedia Conferencing | FS_IMSconf | Rel-8 |
| Feature or Study Item: Study on support of a Public Warning System | FS_PWS | Rel-8 |
| Feature or Study Item: Enhancements for Voice Group Call Service (VGCS) Applications (EVA) | EVA | Rel-8 |
| Building Block: Stage 1 for PNM | PNM | Rel-8 |
| Feature or Study Item: Study on Customised Alerting Tone (CAT) Requirements | FS_CAT | Rel-8 |
| Feature or Study Item: Study on Facilitating Machine to Machine Communication in GSM and UMTS (M2M) | FS_M2M | Rel-8 |
| Feature or Study Item: Deleted - All-IP Network | AIPN | Rel-8 |
| Building Block: Deleted - Stage 1 | AIPN | Rel-8 |
| Feature or Study Item: Personal Network Management | PNM | Rel-8 |
| Feature or Study Item: Study on Network Composition | FS_NetComp | Rel-8 |
| Feature or Study Item: Value-Added Services for Short Message Service | VAS4SMS | Rel-9 |
| Feature or Study Item: Definition of End-User Identity | EUI | Rel-9 |
| Building Block: Stage 1 for VAS4SMS | VAS4SMS | Rel-9 |
| Feature or Study Item: Deleted - Services Alignment and Migration | ServAl | Rel-9 |
| Feature or Study Item: Service Specific Access Control in EPS | SSAC | Rel-9 |
| Building Block: Stage 1 - IMS Service Continuity – Inter Device Transfer enhancements | IMS_SC_eIDT | Rel-10 |
| Feature or Study Item: IMS Service Continuity – Inter Device Transfer enhancements | IMS_SC_eIDT | Rel-10 |
| Feature or Study Item: Extended H(e)NB features | EHNBF | Rel-10 |
| Building Block: Stage 1 of Extended H(e)NB features | EHNBF | Rel-10 |
| Building Block: Stage 1 BB I: BBF interworking with home routed traffic for WLAN and H(e)NB | BBAI | Rel-11 |
| Feature or Study Item: Study on Policy solutions and enhancements | FS_PP | Rel-11 |
| Building Block: Stage 1 for Network-provided Location information for IMS | NWK-PL2IMS | Rel-11 |
| Feature or Study Item: Non Voice Emergency Services | NOVES | Rel-11 |
| Feature or Study Item: Service Awareness and Privacy Policies | SAPP | Rel-11 |
| Building Block: Stage 1 for UDC Data Model | UDC_DM | Rel-11 |
| Building Block: Stage 1 for SIMTC | SIMTC | Rel-11 |
| Feature or Study Item: Anonymous Call Rejection in the CS domain | ACR_CS | Rel-11 |
| Building Block: Stage 1 for Anonymous Call Rejection in the CS domain | ACR_CS | Rel-11 |
| Feature or Study Item: Transfer of ETSI business trunking specifications | IMS_Corp2 | Rel-12 |
| Feature or Study Item: Smart Congestion Mitigation in E-UTRAN | SCM_LTE | Rel-12 |
| Feature or Study Item: Service and Media Reachability for Users over Restrictive Firewalls | SMURFs | Rel-12 |
| Feature or Study Item: Study on Proximity-based Services | FS_ProSe | Rel-12 |
| Feature or Study Item: Advanced IP Interconnection of Services (IPXS) for national interconnect | IPXSNAT | Rel-12 |
| Feature or Study Item: Integration of Single Sign-On (SSO) frameworks with 3GPP networks | SSO_Int | Rel-12 |
| Building Block: Stage 1 for Advanced IP Interconnection of Services (IPXS) for national interconnect | IPXSNAT-SA1 | Rel-12 |
| Building Block: Stage 1 for Integration of Single Sign-On (SSO) frameworks with 3GPP networks | SSO_Int-SA1 | Rel-12 |
| Building Block: Stage 1 for Proximity-based Services | ProSe-SA1 | Rel-12 |
| Building Block: Stage 1 for Sequential Flexible Alerting | SEQ_FA | Rel-12 |
| Building Block: Stage 1 for Language and Modality Information for communications | LangInfo-SA1 | Rel-12 |
| Building Block: Stage 1 for Web Real Time Communication access to IMS | IMS_WebRTC | Rel-12 |
| Building Block: Deleted - Stage 1 for Security aspects of Public Warning System | PWS_Sec-del2 | Rel-12 |
| Feature or Study Item: Study on enhancements for Machine-Type Communications (MTC) | FS_MTCe | Rel-12 |
| Feature or Study Item: Study on IMS based Peer-to-Peer Content Distribution Services (Stage 2) | FS_IMS_P2P_CDS | Rel-12 |
| Feature or Study Item: Study on Integration of Single Sign-On (SSO) frameworks with 3GPP networks | FS_SSO_Int | Rel-12 |
| Building Block: Stage 1 for SIPTO Service Continuity of IP Data Session | SIPTO_SC-SA1 | Rel-12 |
| Feature or Study Item: SIPTO Service Continuity of IP Data Session | SIPTO_SC | Rel-12 |
| Feature or Study Item: Interworking between Mobile Operators using the Evolved Packet System and Data Application Providers | MOSAP | Rel-12 |
| Building Block: SA1 part of Study on IMS based Peer-to-Peer Content Distribution Services (Stage 2) | FS_IMS_P2P_CDS | Rel-12 |
| Building Block: Stage 1 for MOSAP | MOSAP-SA1 | Rel-12 |
| Feature or Study Item: Study on Continuity of Data Sessions to Local Networks | FS_CSN | Rel-12 |
| Feature or Study Item: Study on non-MTC Mobile Data Applications Impacts | FS_MODAI | Rel-12 |
| Building Block: Stage 1 fo Isolated E-UTRAN Operation for Public Safety | IOPS | Rel-13 |
| Feature or Study Item: Study on Application specific Congestion control for Data Communication | FS_ACDC | Rel-13 |
| Feature or Study Item: User Plane Congestion management | UPCON | Rel-13 |
| Building Block: Stage 1 for User Plane Congestion management | UPCON-ST1 | Rel-13 |
| Building Block: Stage 1 for voice over E-UTRAN Paging Policy Differentiation | voE_UTRA-N_PPD-SA1 | Rel-13 |
| Feature or Study Item: Enhancements to Proximity-based Services | eProSe | Rel-13 |
| Work task: Definition of service requirements for MESS5-MMS | MESS5-SR | Rel-5 |
| Feature or Study Item: Technical Report on UE Functionality Split | UESPLIT | Rel-5 |
| Building Block: Event Based and Periodic LCS | LCS1-EBP | Rel-5 |
| Feature or Study Item: Paging Policy Enhancements and Procedure | PPEPO_LTE | Rel-14 |
| Building Block: Stage 1 of Enhancement to Flexible Mobile Service Steering | eFMSS | Rel-14 |
| Feature or Study Item: Study on Stage 1 for New Services and Markets Technology Enablers | FS_SMARTER | Rel-14 |
| Building Block: FS_SMARTER – massive Internet of Things | FS_SMARTER-mIoT | Rel-14 |
| Building Block: FS_SMARTER – Critical Communications | FS_SMARTER-CRIC | Rel-14 |
| Building Block: FS_SMARTER – enhanced Mobile Broadband | FS_SMARTER-eMBB | Rel-14 |
| Building Block: FS_SMARTER – Network Operation | FS_SMARTER-NEO | Rel-14 |
| Building Block: Mission Critical Services Common Requirements | MCImp-MCCoRe | Rel-14 |
| Building Block: Mission Critical Push to Talk over LTE Realignment | MCImp-MCPTTR | Rel-14 |
| Work task: Stage 1 of MCVideo | MCImp-MCVideo | Rel-14 |
| Work task: Stage 1 of MCData | MCImp-MCData | Rel-14 |
| Building Block: PS Data Off Services | PS_Data_Off | Rel-14 |
| Feature or Study Item: Enhancements to User Location Reporting Support | eULRS | Rel-14 |
| Building Block: Stage 1 for LTE support for V2X services | V2XLTE | Rel-14 |
| Feature or Study Item: Study on User Location Reporting Support enhancements | FS_eULRS | Rel-14 |
| Feature or Study Item: Study on Control of Applications when Third party Servers encounter difficulties | FS_CATS | Rel-14 |
| Feature or Study Item: Multimedia Priority Service Modifications | MPS_Mods | Rel-14 |
| Feature or Study Item: Enhancing Location Capabilities for Indoor and Outdoor Emergency Communications | ELIOT | Rel-14 |
| Feature or Study Item: Enhancements to Domain Selection between VoLTE and CDMA CS | eDSVCC | Rel-14 |
| Work task: Study on Mission Critical Video over LTE | FS_MCVideo | Rel-14 |
| Work task: Study on Mission Critical Data Communications | FS_MCDATA | Rel-14 |
| Building Block: General aspects of FS_SMARTER SA1 | FS_SMARTER | Rel-14 |
| Work task: Study on Stage 1 of LTE support for V2X services | FS_V2XLTE_S1 | Rel-14 |
| Building Block: Study on 3GPP Enhancement for TV Video service | FS_EnTV | Rel-14 |
| Feature or Study Item: Study on Paging Policy Enhancements and Procedure Optimizations in LTE | FS_PPEPO_LTE | Rel-14 |
| Building Block: Stage 1 for PWDIMS | PWDIMS | Rel-14 |
| Feature or Study Item: Control of Applications when Third party Servers encounter difficulties | CATS | Rel-14 |
| Building Block: Study on enhancement to FMSS for Rel 14 | FS_eFMSS | Rel-14 |
| Building Block: Stage 1 of Evolution to and Interworking with eCall in IMS | EIEI | Rel-14 |
| Feature or Study Item: Study on Multimedia Broadcast Supplement for Public Warning System | FS_MBSP | Rel-14 |
| Feature or Study Item: Study on service aspects for dealing with User Control over spoofed calls | FS_UC_SPOOF | Rel-14 |
| Feature or Study Item: Study on need for Multiple Access Point Names | FS_MAPN | Rel-14 |
| Building Block: Stage 1 for Co-ordinated packet data network gateway (P-GW) change for SIPTO | CSIPTO-ST1 | Rel-13 |
| Building Block: Stage 1 for Application specific Congestion control for Data Communication | ACDC-ST1 | Rel-13 |
| Building Block: Stage 1 for Flexible Mobile Service Steering | FMSS-ST1 | Rel-13 |
| Building Block: Study on Enhancement of 3GPP support for V2X services | FS_eV2X | Rel-15 |
| Building Block: Study on Future Railway Mobile Communication System | FS_FRMCS | Rel-15 |
| Building Block: (Stage 1 of 5G) New Services and Markets Technology Enablers | SMARTER | Rel-15 |
| Building Block: Stage 1 for REAR | REAR | Rel-15 |
| Feature or Study Item: Enhanced Calling Information Presentation | ECIP | Rel-13 |
| Feature or Study Item: Flexible Mobile Service Steering | FMSS | Rel-13 |
| Feature or Study Item: GERAN UTRAN Sharing Enhancements | GUSH | Rel-13 |
| Building Block: Stage 1 for Enhancements to Proximity-based Services | eProSe-SA1 | Rel-13 |
| Feature or Study Item: Service Requirements Maintenance for Group Communication System Enablers for LTE | SRM_GCSE_LTE | Rel-13 |
| Feature or Study Item: (SA66: on hold) Co-ordinated packet data network gateway (P-GW) change for SIPTO | CSIPTO | Rel-13 |
| Feature or Study Item: voice over E-UTRAN Paging Policy Differentiation | voE_UTRAN_PPD | Rel-13 |
| Feature or Study Item: Application specific Congestion control for Data Communication | ACDC | Rel-13 |
| Feature or Study Item: Rel-5 Open Service Access (OSA) enhancements | OSA1 | Rel-5 |
| Feature or Study Item: Rel-5 USIM toolkit enhancements | USAT5 | Rel-5 |
| Work task: Service Examples (Work stopped) | IMS-Sex | Rel-5 |
| Work task: IMS Framework Report (work stopped) | IMS-FrWk | Rel-5 |
| Building Block: Access to User Profile | OSA2-UP | Rel-5 |
| Feature or Study Item: CAMEL phase 4 | CAMEL4 | Rel-5 |
| Building Block: LCS - OSA interfaces | OSA1-LCSI | Rel-5 |
| Feature or Study Item: Rel-5 Location Services enhancements | LCS1 | Rel-5 |
| Feature or Study Item: Provisioning of IP-based multimedia services | IMS | Rel-5 |
| Feature or Study Item: RAN Sharing Enhancements | RSE | Rel-13 |
| Feature or Study Item: Study on Isolated E-UTRAN Operation for Public Safety | FS_IOPS | Rel-13 |
| Building Block: Stage 1 for RAN Sharing Enhancements | RSE-SA1 | Rel-13 |
| Building Block: TR on Stage 1 for Service Exposure and Enablement Support | SEES | Rel-13 |
| Feature or Study Item: (SA66: on hold) Study on Co-ordinated packet data network gateway (P-GW) change for SIPTO | FS_CSIPTO | Rel-13 |
| Feature or Study Item: Service Exposure and Enablement Support | SEES | Rel-13 |
| Feature or Study Item: Study on enhancements for Infrastructure based data Communication Between Devices | FS_eICBD | Rel-13 |
| Building Block: Stage 1 for Enhancements to WEBRTC interoperability | eWebRTCi | Rel-13 |
| Feature or Study Item: Service Requirements Maintenance for Machine-Type Communications (MTC) | SRMMTC | Rel-13 |
| Building Block: Stage 1 for MCPTT | MCPTT | Rel-13 |
| Feature or Study Item: Enhancements to WEBRTC interoperability | eWebRTCi | Rel-13 |
| Feature or Study Item: Isolated E-UTRAN Operation for Public Safety | IOPS | Rel-13 |
| Feature or Study Item: Study on RAN Sharing Enhancements on GERAN and UTRAN | FS_GUSH | Rel-13 |
| Feature or Study Item: Study on Flexible Mobile Service Steering | FS_FMSS | Rel-13 |
| Feature or Study Item: Study on Enhanced Calling Information Presentation | FS_ECIP | Rel-13 |
| Building Block: Stage 1 for Service Exposure and Enablement Support | SEES | Rel-13 |
| Building Block: Stage 1 of User Controlled Spoofed Call Treatment | SPECTRE | Rel-14 |
| Feature or Study Item: Sequential Flexible Alerting | SEQ_FA | Rel-12 |
| Feature or Study Item: Language and Modality Information for communications | LangInfo | Rel-12 |
| Feature or Study Item: Web Real Time Communication access to IMS | IMS_WebRTC | Rel-12 |
| Building Block: Stage 1 for Machine-Type and other mobile data applications Communications – Service Requirement Maintenance | MTCe-SRM | Rel-12 |
| Building Block: Stage 1 for Policy and Charging Support for Fixed Mobile Convergence | P4C-FMC | Rel-12 |
| Building Block: Stage 1 for IMS Network-Independent Public User Identities | INIPUI-SA1 | Rel-12 |
| Feature or Study Item: IMS Network-Independent Public User Identities | INIPUI | Rel-12 |
| Feature or Study Item: Security aspects of Public Warning System | PWS_Sec | Rel-12 |
| Feature or Study Item: Study on Multi Access PDN connectivity and IP flow Mobility | FS_MAPIM | Rel-12 |
| Building Block: SA1 part of Study on Multi Access PDN connectivity and IP flow Mobility | FS_MAPIM | Rel-12 |
| Feature or Study Item: Study on Alternatives to E.164 for Machine-Type Communications | FS_AMTC | Rel-12 |
| Feature or Study Item: Codec for Enhanced Voice Services | EVS_codec | Rel-12 |
| Building Block: Stage 1 for Codec for Enhanced Voice Services | EVS_codec-SA1 | Rel-12 |
| Feature or Study Item: Deleted - Study on UICC/USIM enhancements | FS_U2e | Rel-12 |
| Building Block: Stage 1 for Emergency Session Identification | ESID-SA1 | Rel-12 |
| Building Block: Deleted - Stage 1 for Application and Service Access Control | ASAC-SA1del | Rel-12 |
| Building Block: Stage 1 for Prevention of Mobile-Originating signalling and/or data traffic of UE in Connected mode | PMOC-SA1 | Rel-12 |
| Feature or Study Item: Study on User Plane Congestion management | FS_UPCON | Rel-12 |
| Feature or Study Item: Study on RAN Sharing Enhancements | FS_RSE | Rel-12 |
| Building Block: Stage 1 for IMS-based Telepresence | IMS_TELEP | Rel-12 |
| Building Block: Stage 1 for Service and Media Reachability for Users over Restrictive Firewalls | SMURFs-SA1 | Rel-12 |
| Feature or Study Item: IMS-based Telepresence | IMS_TELEP | Rel-12 |
| Feature or Study Item: Explicit Communication Transfer Blind (ECT Blind) service interactions | ECTB | Rel-12 |
| Feature or Study Item: Group Communication System Enablers for LTE | GCSE_LTE | Rel-12 |
| Building Block: Stage 1 for Support for Interworking with M2M Service Enablement | MTCe-SIMSE | Rel-12 |
| Feature or Study Item: Policy and Charging Control for supporting fixed broadband access networks | P4C | Rel-12 |
| Feature or Study Item: IMS Business Trunking for IP-PBX in Static Mode of Operation | BusTI | Rel-12 |
| Feature or Study Item: WLAN Network Selection for 3GPP Terminals | WLAN_NS | Rel-12 |
| Building Block: Stage 1 for IMS access via DVB-RCS2 | IMSSat-SA1 | Rel-12 |
| Building Block: Deleted - Stage 1 for IMS Registration Control | IMS_RegCon-del1 | Rel-12 |
| Feature or Study Item: IMS access via Digital Video Broadcast - Return Channel via Satellite (DVB-RCS2) | IMSSat | Rel-12 |
| Feature or Study Item: Deleted - IMS Registration Control | IMS_RegCon | Rel-12 |
| Feature or Study Item: Emergency Session Identification | ESID | Rel-12 |
| Feature or Study Item: Deleted - Application and Service Access Control | ASAC | Rel-12 |
| Feature or Study Item: Prevention of Mobile-Originating signalling and/or data traffic of UE in Connected mode | PMOC | Rel-12 |
| Building Block: Stage 1 for IMS Business Trunking for IP-PBX in Static Mode of Operation | BusTI-SA1 | Rel-12 |
| Building Block: Stage 1 for Protection against false PWS Warning Notifications | PWS_Sec-SA1 | Rel-12 |
| Building Block: SA1 part of Transfer of ETSI business trunking specifications | IMS_Corp2 | Rel-12 |
| Building Block: Stage 1 for Explicit Communication Transfer Blind (ECT Blind) service interactions | ECTB-SA1 | Rel-12 |
| Building Block: Stage 1 for Group Communication System Enablers for LTE | GCSE_LTE | Rel-12 |
| Building Block: TR on IMS Business Trunking for IP-PBX in Static Mode of Operation | BusTI-SATR | Rel-12 |
| Building Block: TR on Stage 2 for WLAN Network Selection for 3GPP Terminals | WLAN_NS-SATR | Rel-12 |
| Feature or Study Item: IP-Short-Message-Gateway enhancements for CPM-SMS Interworking | CPM-SMS | Rel-10 |
| Building Block: Stage 1 for CPM-SMS | CPM-SMS | Rel-10 |
| Feature or Study Item: Completion of Communications on Not Logged-in | CCNL | Rel-10 |
| Building Block: Stage 1 for Completion of Communications on Not Logged-in | CCNL | Rel-10 |
| Feature or Study Item: Local IP Access and Selected Internet IP Traffic Offload | LIPA_SIPTO | Rel-10 |
| Building Block: Stage 1 for Local IP Access and Selected Internet IP Traffic Offload | LIPA_SIPTO | Rel-10 |
| Feature or Study Item: IP Flow Mobility and seamless WLAN offload | IFOM | Rel-10 |
| Building Block: Stage 1 for IP Flow Mobility and seamless WLAN offload | IFOM | Rel-10 |
| Building Block: Deleted - Stage 1 for N3GtoNSP | N3GtoNSP | Rel-10 |
| Feature or Study Item: Deleted - Network Selection for non-3GPP Access | N3GtoNSP | Rel-10 |
| Feature or Study Item: Deleted - Study on Unauthenticated PS Emergency Calls | FS_UAPSEC | Rel-10 |
| Feature or Study Item: Study on advanced requirements for IP interconnect | FS_IPXS | Rel-10 |
| Feature or Study Item: Enhancements for Multimedia Priority Service | eMPS | Rel-10 |
| Building Block: Stage 1 on enhancements for Multimedia Priority Service | ePRIOR-St1 | Rel-10 |
| Building Block: Use cases definition and service and system requirements | FS_EV_EPS-S1 | Rel-10 |
| Feature or Study Item: Study on enhanced voice service requirements for the Evolved Packet System (EPS) | FS_EV_EPS | Rel-10 |
| Building Block: Deleted - Stage 1 for RED | RED | Rel-10 |
| Feature or Study Item: Deleted - Registration in Densely-populated area (RED) | RED | Rel-10 |
| Feature or Study Item: Support for BroadBand Forum Accesses Interworking | BBAI | Rel-11 |
| Feature or Study Item: Study on Non Voice Emergency Services | FS_NOVES | Rel-11 |
| Feature or Study Item: Study on IMS based Peer-to-Peer Content Distribution Services | FS_IMS_P2P | Rel-11 |
| Feature or Study Item: User Data Convergence - Data Model | UDC_DM | Rel-11 |
| Feature or Study Item: Transit Inter Operator Identifier for IMS Interconnection Charging in multi operator environment | IOI_IMS_CH | Rel-11 |
| Building Block: Stage 1 for Service Awareness and Privacy Policies | SAPP | Rel-11 |
| Building Block: Stage 1 for Non Voice Emergency Services | NOVES | Rel-11 |
| Building Block: Stage 1 for Optimized Service Charging and Allocation of Resources in IMS whilst Roaming | OSCAR | Rel-11 |
| Building Block: Stage 1 for QoS Control Based on Subscriber Spending Limits | QoS_SSL | Rel-11 |
| Building Block: Stage 1 for USSD simulation service in IMS | USSI | Rel-11 |
| Building Block: Stage 1 BB II: BBF interworking with offload in access network for WLAN and for H(e)NB | BBAI_BBII-CTofldS1 | Rel-11 |
| Feature or Study Item: QoS Control Based on Subscriber Spending Limits | QoS_SSL | Rel-11 |
| Feature or Study Item: Optimized Service Charging and Allocation of Resources in IMS whilst Roaming | OSCAR | Rel-11 |
| Feature or Study Item: Study on IMS Network-Independent Public User Identities | FS_INIPUI | Rel-11 |
| Feature or Study Item: Advanced IP Interconnection of Services | IPXS | Rel-11 |
| Building Block: Stage 1 for Advanced IP Interconnection of Services | IPXS | Rel-11 |
| Feature or Study Item: System Improvements to Machine-Type Communications | SIMTC | Rel-11 |
| Feature or Study Item: Unstructured Supplementary Service Data (USSD) simulation service in IMS | USSI | Rel-11 |
| Feature or Study Item: Network-provided Location information for IMS (NETLOC) | NWK-PL2IMS | Rel-11 |
| Feature or Study Item: Study on Support for 3GPP Voice Interworking with Enterprise IP-PBX | FS_VINE | Rel-11 |
| Building Block: Stage 1 for Support for 3GPP Voice Interworking with Enterprise IP-PBX | VINE | Rel-11 |
| Building Block: Stage 1 for Definition of End-User Identity | EUI | Rel-9 |
| Building Block: Stage 1 for Customized Ringing Signal | CRS | Rel-9 |
| Feature or Study Item: Protection against Unsolicited Communication for IMS (PUCI) | PUCI | Rel-9 |
| Building Block: Stage 1 for PUCI | PUCI | Rel-9 |
| Feature or Study Item: IMS Services Centralization and Continuity | IMS_SCC | Rel-9 |
| Building Block: Stage 1 - Inter-Device Transfer – Requirements | IMS_SCC-IDT | Rel-9 |
| Building Block: Stage 1 for IMS Emergency Calls over GPRS and EPS | IMS_EMER_GPRS_EPS | Rel-9 |
| Feature or Study Item: Support for 3GPP Voice Interworking with Enterprise IP-PBX | VINE | Rel-11 |
| Building Block: Stage 1 for Transit Inter Operator Identifier for IMS Interconnection Charging in multi operator environment | IOI_IMS_CH | Rel-11 |
| Building Block: SA1 aspects of IMS_Corp | IMS_Corp | Rel-8 |
| Building Block: Stage 1 CIMS_3GPP2 | CIMS_3GPP2 | Rel-8 |
| Feature or Study Item: IMS Service Continuity | IMS-Cont | Rel-8 |
| Building Block: Flexible Alerting | FA | Rel-8 |
| Work task: Stage 1 FA | FA | Rel-8 |
| Building Block: Stage 1 IMS Service Continuity | IMS-Cont | Rel-8 |
| Building Block: OSA Stage 1 - Service Requirements | OSA8 | Rel-8 |
| Building Block: OSA Stage 1 - NGN Service Requirement | OSA8-IMSReq | Rel-8 |
| Feature or Study Item: Study on Paging Permission with Access Control | FS_PPAC | Rel-8 |
| Feature or Study Item: Study on Haptic Services | FS_Haptics | Rel-10 |
| Feature or Study Item: Study on Personal Broadcast Service | FS_PBS | Rel-10 |
| Feature or Study Item: Study on LCS support in SAE for non-3GPP accesses | FS_LCS_n3GPP | Rel-10 |
| Feature or Study Item: Network Improvements for Machine-Type Communications | NIMTC | Rel-10 |
| Building Block: Stage 1 for Network Improvements for Machine-Type Communications | NIMTC | Rel-10 |
| Feature or Study Item: IMS System enhancements for corporate network access | IMS_Corp | Rel-8 |
| Feature or Study Item: Paging Permission with Access Control (PPACR) | PPACR | Rel-8 |
| Building Block: VGCS/VBS and GPRS Interactions | EVA | Rel-8 |
| Work task: Service and Capability for Core IMS - inclusion of TISPAN requirements | TISCAPR8 | Rel-8 |
| Work task: Merging TISPAN MMTel [requirements] for Common IMS | TMMTEL | Rel-8 |
| Feature or Study Item: IMS Centralized Service control | ICSRA | Rel-8 |
| Feature or Study Item: Multimedia Priority Service | PRIOR_EMR | Rel-8 |
| Feature or Study Item: Customized Alerting Tone (CAT) service | CAT | Rel-8 |
| Feature or Study Item: I-WLAN Network Selection Principle (NSP) | IWLANNSP | Rel-8 |
| Feature or Study Item: Service-Level Interworking for Messaging Services | MESSIW | Rel-8 |
| Feature or Study Item: Study on Non-3GPP access Network Selection Principles (NSP) | FS_N3GtoNSP | Rel-8 |
| Feature or Study Item: Study on Value Added Services for Short Message Service | FS_VAS4SMS | Rel-8 |
| Feature or Study Item: Study on Service continuity between mobile and WLAN networks | FS_SMLSWLAN | Rel-8 |
| Feature or Study Item: eCall Data Transfer | EData | Rel-8 |
| Feature or Study Item: Local Charging Zone Requirements | LCZR | Rel-8 |
| Feature or Study Item: Deleted -Enhancements to BS30 Bearer service for Videotelephony | BS30 | Rel-8 |
| Building Block: SA1 aspects of EVA | EVA | Rel-8 |
| Building Block: Requirements for evolution of the 3GPP system architecture | AIPN-SAE | Rel-8 |
| Building Block: Service Requirements for PRIOR | PRIOR_EMR | Rel-8 |
| Feature or Study Item: 3GPP System Architecture Evolution Specification - Evolved Packet System (non RAN aspects) | SAES | Rel-8 |
| Feature or Study Item: Support for Additional Navigation Satellite Systems (ANSS) for LCS | ANSS | Rel-8 |
| Building Block: Stage 1 of NSP | NSP-TS | Rel-7 |
| Building Block: Stage 1/2 for Towards AGNSS Concept | AGNSS | Rel-7 |
| Feature or Study Item: IMS Emergency Session Enhancements | IESE | Rel-10 |
| Feature or Study Item: Study on Multimedia Telephony Capabilities for IMS | MITE | Rel-7 |
| Feature or Study Item: Study on Transferring of emergency Call data | eCALL | Rel-7 |
| Feature or Study Item: MBMS Enhancements | MBMSE | Rel-7 |
| Feature or Study Item: IMS Service Brokering enhancements | ISB | Rel-7 |
| Building Block: OSA Service Broker | OSA7-SB | Rel-7 |
| Building Block: Service Requirements for VGCS improvements | IVGCS | Rel-7 |
| Feature or Study Item: Open Service Access (OSA) Rel-7 | OSA7 | Rel-7 |
| Work task: Service Requirements for OSA Service Broker | OSA7 | Rel-7 |
| Feature or Study Item: Study on Network Selection Principles | NetSel | Rel-7 |
| Feature or Study Item: Study on Videotelephony teleservice | VidTel | Rel-7 |
| Feature or Study Item: Deleted - Covered by SI - Personal Network (PN) and Personal Area Network (PAN) | PNPAN | Rel-7 |
| Feature or Study Item: Unstructured Supplementary Service Data (USSD) message delivery and transfer to USIM | USSD-USIM | Rel-7 |
| Feature or Study Item: Study on Behaviour of Multi system UEs | BMSU | Rel-7 |
| Feature or Study Item: Advanced Global Navigation Satellite System (AGNSS) concept | LCS3-AGNSS | Rel-7 |
| Building Block: LCS for 3GPP Interworking WLAN | LCS3-IWLAN | Rel-7 |
| Feature or Study Item: Selective Disabling of UE Capabilities | SDoUE | Rel-7 |
| Feature or Study Item: Deleted - Study on IMS with real time services deployment | IRTSD | Rel-7 |
| Feature or Study Item: Study on Combining CS calls and IMS sessions | IRTSD-CS_IMS | Rel-7 |
| Building Block: Stage 1 on Session Continuity | WLAN2 | Rel-7 |
| Feature or Study Item: Study on All-IP Network | FS_AIPN | Rel-7 |
| Feature or Study Item: Support of Personal Area Networks and Enhancements to Personal Network Management | PAN_EPNM | Rel-9 |
| Feature or Study Item: Multi-Media Telephony Service enhancements | eMMTel | Rel-9 |
| Feature or Study Item: User Data Convergence (UDC) | UDC | Rel-9 |
| Feature or Study Item: Enhanced Home NodeB / eNodeB | EHNB | Rel-9 |
| Feature or Study Item: Study on Service Specific Access Control in EPS | FS_SSAC | Rel-9 |
| Building Block: Stage 1 for Support of Personal Area Networks and Enhancements to Personal Network Management | PAN_EPNM | Rel-9 |
| Building Block: Stage 1 for eMMTel | eMMTel | Rel-9 |
| Building Block: Stage 1 for User Data Convergence (UDC) | UDC | Rel-9 |
| Building Block: Stage 1 for EHNB | EHNB | Rel-9 |
| Feature or Study Item: Public Warning System | PWS | Rel-9 |
| Building Block: Stage 1 for Public Warning System | PWS | Rel-9 |
| Feature or Study Item: Support for IMS Emergency Calls over GPRS and EPS | IMS_EMER_GPRS_EPS | Rel-9 |
| Building Block: Service Requirements for IP-based emergency calls | EMC1 | Rel-7 |
| Building Block: Stage 1,2 of GRUU | GRUU | Rel-7 |
| Feature or Study Item: Enhancements of VGCS for public authority officials | EVGCS | Rel-7 |
| Feature or Study Item: Improvements of VGCS for parallel use of services | IVGCS | Rel-7 |
| Building Block: Deleted - duplicates UID7039 - IMS Multimedia Telephony Service | MMTEL | Rel-7 |
| Feature or Study Item: Multimedia Telephony Service for IMS | MTSI | Rel-7 |
| Building Block: Stage 1 of MTSI | MTSI-REQ | Rel-7 |
| Feature or Study Item: Network selection enhancements (NSP) | NSP | Rel-7 |
| Building Block: Stage 1 for ISB | ISB-s1 | Rel-7 |
| Feature or Study Item: Customized Ringing Signal | CRS | Rel-9 |
| Feature or Study Item: Identification of Communication Services in IMS | ServID | Rel-7 |
| Building Block: Stage 1 for ANSS for LCS | ANSS | Rel-8 |
| Feature or Study Item: Service Provider Name Indication | SPANME | R99 |
| Building Block: UMTS_SERVICES | UMTS_SERVICES | R99 |
| Building Block: UMTS phase 1 | UMTS1 | R99 |
| Building Block: Virtual Home Environment | VHE | R99 |
| Feature or Study Item: Vocabulary | Vocabulary | R99 |
| Feature or Study Item: WBAMR / high quality speech in UMTS Phase 1 but not in R99 | WBAMR | R99 |
| Work task: SIM Application Toolkit | SAT | R99 |
| Feature or Study Item: Advanced Speech Call Items enhancements | ASCI | R99 |
| Feature or Study Item: Facsimile | FAX | R99 |
| Building Block: General Packet Radio Service enahancements | GPRSenhancements | R99 |
| Building Block: GSM mobile number portability euro MNP / North American MNP | MNP | R99 |
| Building Block: Stage 1 for IMS Emergency Session Enhancements | IESE | Rel-10 |
| Feature or Study Item: Multimedia Messaging | MMS4 | Rel-4 |
| Building Block: USAT local link | USAT1-LocLnk | Rel-4 |
| Feature or Study Item: Rel-4 Location Services enhancements | LCS4 | Rel-4 |
| Feature or Study Item: Rel-4 Emergency call enhancements | EMC1-CS | Rel-4 |
| Feature or Study Item: Rel-4 (U)SIM toolkit enhancements | USAT4 | Rel-4 |
| Building Block: Stage 1 for Home NodeB / eNodeB | HomeNB-S1 | Rel-8 |
| Feature or Study Item: In Case of Emergency numbers storage and easy access on UICC | ICE | Rel-8 |
| Feature or Study Item: IP Interconnection of Services | IPinterc | Rel-8 |
| Building Block: Stage 1 for IPinterc | IPinterc | Rel-8 |
| Feature or Study Item: Charging for multi-phases services | CHRGMPH | Rel-8 |
| Feature or Study Item: Support of Push Services | PUSH | Rel-6 |
| Feature or Study Item: Speech Recognition and Speech Enabled Services | SRSES | Rel-6 |
| Building Block: Speech Enabled Services Based on Distributed Speech Recognition (DSR) | DSR | Rel-6 |
| Feature or Study Item: Generic User Profile Rel-6 | GUP | Rel-6 |
| Feature or Study Item: Digital Rights Management | DRM | Rel-6 |
| Feature or Study Item: WLAN-UMTS Interworking Rel-6 | WLAN | Rel-6 |
| Feature or Study Item: Priority Service | PRIOR1 | Rel-6 |
| Building Block: Feasibility Study on Priority Service | PRIOR-FS | Rel-6 |
| Building Block: Stage 1 - Requirements for Priority Service | PRIOR-SR | Rel-6 |
| Feature or Study Item: Network Sharing | NTShar | Rel-6 |
| Building Block: Technical Report on Network Sharing | NTShar-TR | Rel-6 |
| Building Block: Technical Report on WLAN-UMTS Interworking | WLAN-TR | Rel-6 |
| Building Block: IMS Messaging | IMSM | Rel-6 |
| Work task: TR on support of messaging in the IMS | IMSM-TR | Rel-6 |
| Building Block: IMS Group Management | IMSGM | Rel-6 |
| Feature or Study Item: Deleted - Study of Feature Interactions Requirements | FINTER | Rel-6 |
| Feature or Study Item: Study on Privacy Capability | PrivCap | Rel-6 |
| Work task: CRs to 22.140 & 22.228 | IMSM-CR | Rel-6 |
| Work task: Stage 1 22.340 | IMSM-TS | Rel-6 |
| Building Block: Stage 1 for WLAN-UMTS Interworking Rel-6 | WLAN-TS | Rel-6 |
| Building Block: Stage 1 - CRs to implement Network Sharing | NTSharCR | Rel-6 |
| Feature or Study Item: IMS Phase 2 | IMS2 | Rel-6 |
| Feature or Study Item: Study on centralized IMS service control | FS_ICS | Rel-8 |
| Building Block: Stage 1 for ICS Requirement and Architecture | ICSRA | Rel-8 |
| Building Block: Stage 1 for SIP_Nc (covered by Feature IPinterc) | SIP_Nc | Rel-8 |
| Building Block: Stage 1 for Service Specific Access Control in EPS | SSAC | Rel-9 |
| Feature or Study Item: Rel-6 Multimedia Messaging (MMS) enhancements | MMS6 | Rel-6 |
| Building Block: Definition of service requirements for MMS6 | MMS6-SR | Rel-6 |
| Feature or Study Item: PS domain and IMS impacts for supporting IMS Emergency calls (EMC1) | EMC1 | Rel-7 |
| Building Block: Stage 1 of SDoUE | SDoUE-CR | Rel-7 |
| Feature or Study Item: Voice Call Continuity between CS and IMS (incl. I-WLAN) | VCC | Rel-7 |
| Building Block: Stage 1,2 of ServID | ServID | Rel-7 |
| Feature or Study Item: Enhancement of background data transfer | eBT | Rel-15 |
| Building Block: Stage 1 of Enhancement of 3GPP support for V2X scenarios | eV2X | Rel-15 |
| Feature or Study Item: Study on Communication for Automation in Vertical Domains | FS_CAV | Rel-16 |
| Building Block: Stage 1 of MONASTERY2 | MONASTERY2 | Rel-16 |
| Building Block: Study on MONASTERY2 | FS_FRMCS2 | Rel-16 |
| Building Block: Study on positioning use cases | FS_5G_HYPOS | Rel-16 |
| Building Block: Study on LAN Support in 5G | FS_5GLAN | Rel-16 |
| Building Block: Study on Maritime Communication Services over 3GPP system | FS_MARCOM | Rel-16 |
| Building Block: Study on enhancements of Public Warning System | FS_ePWS | Rel-16 |
| Building Block: Study on eLSTR | FS_eLESTR | Rel-16 |
| Building Block: Study on a Layer for User Centric Identifiers and Authentication | FS_LUCIA | Rel-16 |
| Feature or Study Item: Study on using Satellite Access in 5G | FS_5GSAT | Rel-16 |
| Feature or Study Item: Study on enhancements to IMS for new real time communication services | FS_enIMS | Rel-16 |
| Building Block: Study on 5G message service for MIoT | FS_5GMSG | Rel-16 |
| Building Block: Study on Business Role Models for Network Slicing | FS_BMNS | Rel-16 |
| Building Block: Stage 1 of PARLOS | PARLOS | Rel-16 |
| Feature or Study Item: 5G Voice Service Continuity | 5GVSC | Rel-16 |
| Feature or Study Item: New Services and Markets Technology Enablers – Phase 2 | SMARTER_Ph2 | Rel-16 |
| Feature or Study Item: Study on Improvement of V2X Service Handling | FS_V2XIMP | Rel-16 |
| Feature or Study Item: Enhancements to IMS for new real time communication services | enIMS | Rel-16 |
| Feature or Study Item: QoS Monitoring | QoS_MON | Rel-16 |
| Feature or Study Item: Study on Remote Identification of Uncrewed Aerial Systems | FS_ID_UAS | Rel-16 |
| Feature or Study Item: Study on Extended Provision of Connectivity Opportunities | FS_EPCO | Rel-16 |
| Building Block: Stage 1 of 5G_HYPOS | 5G_HYPOS | Rel-16 |
| Building Block: Stage 1 of User Identities and Authentication | UIA | Rel-16 |
| Building Block: Stage 1 of MARCOM | MARCOM | Rel-16 |
| Building Block: Stage 1 of ePWS | ePWS | Rel-16 |
| Building Block: Stage 1 of eLSTR | eLSTR | Rel-16 |
| Building Block: Stage 1 of Multi-device and multi-identity | MuD | Rel-16 |
| Feature or Study Item: Inter-RAT Mobility requirements for real time service | MOBRT | Rel-16 |
| Feature or Study Item: LAN support in 5G | 5GLAN | Rel-16 |
| Feature or Study Item: Service requirements for cyber-physical control applications in vertical domains | cyberCAV | Rel-16 |
| Feature or Study Item: Enhancement of LTE for Efficient delivery of Streaming Service | eLSTR | Rel-16 |
| Feature or Study Item: Policy delivery to UE for background data transfer | PDBDT | Rel-16 |
| Feature or Study Item: Integration of Satellite Access in 5G | 5GSAT | Rel-16 |
| Feature or Study Item: Maritime Communication Services over 3GPP System | MARCOM | Rel-16 |
| Feature or Study Item: User Identities and Authentication | UIA | Rel-16 |
| Feature or Study Item: 5G positioning services | 5G_HYPOS | Rel-16 |
| Building Block: Stage 1 of 5GLAN | 5GLAN | Rel-16 |
| Feature or Study Item: 5G message service | 5GMSG | Rel-16 |
| Feature or Study Item: Business Role Models for Network Slicing | BRMNS | Rel-16 |
| Feature or Study Item: Improvement of V2X service Handling | V2XIMP | Rel-16 |
| Building Block: Message Service Within the 5G System requirements | MSGin5G | Rel-16 |
| Building Block: Business Role Models for Network Slicing | BRMNS | Rel-16 |
| Building Block: Stage 1 of MINT | MINT | Rel-17 |
| Building Block: Stage 1 of ATRAC | ATRAC | Rel-17 |
| Feature or Study Item: Enhanced Calling Name Service Analytics Interworking | eCNAM_An | Rel-17 |
| Building Block: Stage 1 of eCPSOR_CON | eCPSOR_CON | Rel-17 |
| Feature or Study Item: Broadcast / Multicast requirements supporting Mission Critical Services in 5G | 5MBS_eMC | Rel-17 |
| Building Block: Stage 1 of MuDE | MuDE | Rel-17 |
| Building Block: Stage 1 of NCIS | NCIS | Rel-17 |
| Building Block: Stage 1 of AVPROD | AVPROD | Rel-17 |
| Building Block: Stage 1 of MPS2 | MPS2 | Rel-17 |
| Building Block: Stage 1 of CMED | CMED | Rel-17 |
| Building Block: Stage 1 of REFEC | REFEC | Rel-17 |
| Building Block: Stage 1 of EAV | EAV | Rel-17 |
| Building Block: Stage 1 of MUSIM | MUSIM | Rel-17 |
| Building Block: Stage 1 of eCAV | eCAV | Rel-17 |
| Feature or Study Item: Complete Gap Analysis for Railways Mobile Communication System | MONASTERYEND | Rel-17 |
| Feature or Study Item: Study on Future Railway Mobile Communication System3 | FS_FRMCS3 | Rel-17 |
| Feature or Study Item: IMS emergency support for Stand-alone Non-Public Network (SNPN) | IESNPN | Rel-17 |
| Feature or Study Item: Verification-modified Calling Name Display | VMOD_DISPLAY | Rel-17 |
| Building Block: Study on MINT | FS_MINT | Rel-17 |
| Building Block: Study on MUSIM | FS_MUSIM | Rel-17 |
| Building Block: Study on eCAV | FS_eCAV | Rel-17 |
| Building Block: Stage 1 of Remote Identification of Uncrewed Aerial Systems | ID_UAS | Rel-17 |
| Building Block: Study on CMED | FS_CMED | Rel-17 |
| Building Block: Study on ATRAC | FS_5G_ATRAC | Rel-17 |
| Building Block: Study on REFEC | FS_REFEC | Rel-17 |
| Building Block: Study on EAV | FS_EAV | Rel-17 |
| Building Block: Stage 1 of 5GSAT | 5GSAT | Rel-17 |
| Feature or Study Item: NPN support of PWS | NPN_PWS | Rel-17 |
| Building Block: Study on AVPROD | FS_AVPROD | Rel-17 |
| Building Block: Study on NCIS | FS_NCIS | Rel-17 |
| Building Block: Study on MPS2 | FS_MPS2 | Rel-17 |
| Building Block: Study on VMR | FS_VMR | Rel-18 |
| Building Block: Study on PALS | FS_PALS | Rel-18 |
| Feature or Study Item: Subscriber-aware Northbound API access | SNA | Rel-18 |
| Feature or Study Item: Study on FRMCS Phase 4 | FS_FRMCS_Ph4 | Rel-18 |
| Building Block: Study on TACMM | FS_TACMM | Rel-18 |
| Feature or Study Item: Support for Service Function Chaining | SFChain | Rel-18 |
| Building Block: Stage 1 for EASNS | EASNS | Rel-18 |
| Building Block: Stage 1 for 5TRS | 5TRS | Rel-18 |
| Building Block: Stage 1 for Ranging | Ranging | Rel-18 |
| Feature or Study Item: Data Integrity in 5GS | DI_5G | Rel-18 |
| Feature or Study Item: Low Power High Accuracy Positioning for industrial IoT scenarios | LPHAP | Rel-18 |
| Building Block: Stage 1 of Evolution of IMS Multimedia Telephony Service | eMMTEL | Rel-18 |
| Building Block: Stage 1 of AMMT | AIML_MT | Rel-18 |
| Building Block: Stage 1 of PALS | PALS | Rel-18 |
| Building Block: Stage 1 of Smart Energy and Infrastructure | SEI | Rel-18 |
| Feature or Study Item: Signal level Enhanced Network Selection | SENSE | Rel-18 |
| Feature or Study Item: 5G system with satellite access to Support Control and/or Video Surveillance | SCVS | Rel-18 |
| Building Block: Stage 1 of 5GSATB | 5GSATB | Rel-18 |
| Building Block: Stage 1 of TACMM | TACMM | Rel-18 |
| Building Block: Stage 1 of VMR | VMR | Rel-18 |
| Building Block: Stage 1 of PIRates | PIRates | Rel-18 |
| Feature or Study Item: Service exposure interfaces for industry | EXPOSE | Rel-18 |
| Building Block: Stage 1 of MPS_WLAN | MPS_WLAN | Rel-18 |
| Feature or Study Item: Ad hoc Group Communication support in Mission Critical Services | AHGC | Rel-18 |
| Feature or Study Item: Sharing administrative configuration between interconnected MCX Service systems | SACI_MCS | Rel-18 |
| Building Block: Study on traffic characteristics and performance requirements for AI/ML model transfer in 5GS | FS_AIML_MT | Rel-18 |
| Feature or Study Item: Guidelines for Extra-territorial 5G Systems | FS_5GET | Rel-18 |
| Building Block: Study on EASNS | FS_EASNS | Rel-18 |
| Feature or Study Item: Study on Off-Network for Rail | FS_OffNetRail | Rel-18 |
| Building Block: Study on 5TRS | FS_5TRS | Rel-18 |
| Building Block: Study on 5G Smart Energy and Infrastructure | FS_5GSEI | Rel-18 |
| Building Block: Study on Ranging | FS_Ranging | Rel-18 |
| Building Block: Study on Enhancements for Residential 5G | FS_Resident | Rel-18 |
| Building Block: Study on Personal IoT Networks | FS_PIN | Rel-18 |
| Building Block: Study on evolution of IMS multimedia telephony service | FS_MMTELin5G | Rel-18 |
| Feature or Study Item: Study on sharing administrative configuration between interconnected MCX Service systems | FS_SACI_MCS | Rel-18 |
| Feature or Study Item: Modified PRINS for roaming service providers in 5G | Roaming5G | Rel-18 |
| Building Block: Stage 1 of Roaming5G | Roaming5G | Rel-18 |
| Feature or Study Item: SMS over IMS to emergency centre | SMS2EC | Rel-18 |
| Feature or Study Item: Measurement Data Collection | MeasureData | Rel-19 |
| Feature or Study Item: PS Data Off for IMS Data Channel Service | IMSDCDataOff | Rel-19 |
| Feature or Study Item: Edge Computing for Industrial Scenarios | EDGINDUS | Rel-19 |
| Building Block: Roaming Value-Added Services | RVAS | Rel-19 |
| Building Block: Supporting UE Mobility for XR Services | XRMobility | Rel-19 |
| Feature or Study Item: Study on Interconnect of SNPN | FS_ISN | Rel-19 |
| Building Block: Study on roaming value added services | FS_RVAS | Rel-19 |
| Building Block: Study on satellite access - Phase 3 | FS_5GSAT_Ph3 | Rel-19 |
| Building Block: Study on (Stage 1 of) UAV Phase 3 | FS_UAV_Ph3 | Rel-19 |
| Feature or Study Item: Study on Upper layer traffic steering, switching and split over dual 3GPP access | FS_DualSteer | Rel-19 |
| Building Block: Study on Energy Efficiency as service criteria | FS_EnergyServ | Rel-19 |
| Feature or Study Item: Study on Network of Service Robots with Ambient Intelligence | FS_SOBOT | Rel-19 |
| Building Block: Stage 2 of Minimization of Service Interruption During Core Network Failure Phase 2 | MINT_Ph2 | Rel-19 |
| Building Block: (stage 1 of) MPS for Messaging services | MPS4msg | Rel-19 |
| Feature or Study Item: Interworking of Non-3GPP Digital Terrestrial Broadcast Networks with 5GS Multicast Broadcast Services | DTT4MBS | Rel-19 |
| Feature or Study Item: Multi-path relay | MultiRelay | Rel-19 |
| Building Block: Stage 1 of Satellite access Phase 3 | 5GSAT_Ph3 | Rel-19 |
| Feature or Study Item: UE-to-UE multi-hop relay | UEMHopRelay | Rel-19 |
| Building Block: Stage 1 of Integrated Sensing and Communication | Sensing | Rel-19 |
| Feature or Study Item: Non-Public Network (NPN) security considerations | SecNPN | Rel-19 |
| Building Block: Stage 1 of Localized Mobile Metaverse Services | Metaverse | Rel-19 |
| Building Block: (Stage 1 of) Indirect Network Sharing | NetShare | Rel-19 |
| Feature or Study Item: AI/ML Model Transfer Phase 2 | AIML_MT_Ph2 | Rel-19 |
| Feature or Study Item: FRMCS Phase 5 | FRMCS_Ph5 | Rel-19 |
| Building Block: Stage 1 of Uncrewed Aerial System Phase 3 | UAS_Ph3 | Rel-19 |
| Building Block: Stage 1 of Energy Efficiency as Service Criteria | EnergyServ | Rel-19 |
| Feature or Study Item: Edge Computing Considering the Operational Needs of Service Hosting Environment | EdgeOpNeeds | Rel-19 |
| Feature or Study Item: Upper layer traffic steering, switching and splitting over dual 3GPP access | DualSteer | Rel-19 |
| Feature or Study Item: Ambient power-enabled Internet of Things | AmbientIoT | Rel-19 |
| Feature or Study Item: Local traffic routing for multi-access UE | LTR_MA | Rel-19 |
| Building Block: Stage 1 of Ambient power-enabled Internet of Things | AmbientIoT | Rel-19 |
| Feature or Study Item: Upper layer traffic steering and switching over dual 3GPP access | DualSteer | Rel-19 |
| Feature or Study Item: Timestamp Information Exposure for critical IoT Applications | TIE_IoTAPP | Rel-19 |
| Feature or Study Item: Monitoring of signalling traffic in 5G | MonSTra | Rel-19 |
| Feature or Study Item: Proximity-based Services in 5GS Phase 3 | 5G_ProSe_Ph3 | Rel-19 |
| Feature or Study Item: Interconnect of SNPN | ISN | Rel-19 |
| Building Block: Stage 1 for MonSta | MonSTra | Rel-19 |
| Feature or Study Item: Minimization of Service Interruption During Core Network Failure Phase 2 | MINT_Ph2 | Rel-19 |
| Feature or Study Item: Study on Supporting of Railway Smart Station Services | FS_RAILSS | Rel-19 |
| Building Block: Study on Integrated Sensing and Communication | FS_Sensing | Rel-19 |
| Building Block: Study on Ambient power-enabled Internet of Things | FS_AmbientIoT | Rel-19 |
| Building Block: Study on Localized Mobile Metaverse Services | FS_Metaverse | Rel-19 |
| Building Block: Study on Network Sharing Aspects | FS_NetShare | Rel-19 |
| Feature or Study Item: Study on FRMCS Phase 5 | FS_FRMCS_Ph5 | Rel-19 |
| Feature or Study Item: Study on AI/ML Model Transfer Phase2 | FS_AIML_MT_Ph2 | Rel-19 |
| Feature or Study Item: Vehicle-Mounted Relays Phase3 | VMR_Ph3 | Rel-20 |
| Feature or Study Item: Satellite access - Phase 4 | 5GSAT_Ph4 | Rel-20 |
| Feature or Study Item: MPS support in 3GPP system with satellite | MPS_Sat | Rel-20 |
| Feature or Study Item: Indirect Network Sharing on Satellite Access Network | INS_SAT | Rel-20 |
| Feature or Study Item: Indirect Network Sharing Phase 2 | NetShare_Ph2 | Rel-20 |
| Feature or Study Item: Resident Phase 2 | Resident_Ph2 | Rel-20 |
| Feature or Study Item: Combined QoS configuration and monitoring | CombQoS | Rel-20 |
| Feature or Study Item: Legacy Residential Gateway Supporting 5G LAN-type Service | LegacyRG_5GLAN | Rel-20 |
| Feature or Study Item: Study on 6G Use Cases and Service Requirements | FS_6G-REQ | Rel-20 |
| Feature or Study Item: Exposure for Virtual Network information and capability | VNExposure | Rel-20 |
| Feature or Study Item: Study on satellite access - Phase 4 | FS_5GSAT_Ph4 | Rel-20 |
| Feature or Study Item: Study on FRMCS Phase 6 | FS_FRMCS_Ph6 | Rel-20 |
| Feature or Study Item: Study on Energy Efficiency as Service Criteria Phase 2 | FS_EnergyServ_Ph2 | Rel-20 |
| Feature or Study Item: GSM/UMTS interworking | 2G3Ginterworking | R99 |
| Feature or Study Item: GSM General Bearer Services (GBS) and interworking scenarios support in UMTS | GSM_to_UMTS_Evol | R99 |
| Feature or Study Item: Handover | Handover | R99 |
| Feature or Study Item: Multiple Subscriber Profile phase 2 | MSP2 | R99 |
| Building Block: MultiCall | Multicall | R99 |
| Feature or Study Item: Advanced Addressing/Numbering | Numbering | R99 |
| Building Block: Open Service Access | OSA | R99 |
| Work task: PHS Internet Access Forum Specification | PIAFS | R99 |
| Building Block: Stage 1 of USOS | USOS | Rel-15 |
| Feature or Study Item: Removal of 'over LTE' limitation from Mission Critical Specifications | MCOver | Rel-15 |
| Building Block: Study on Stage 1 of PARLOS | FS_PARLOS | Rel-15 |
| Building Block: Stage 1 of ProSe_WLAN_DD | ProSe_WLAN_DD | Rel-15 |
| Building Block: Stage 1 of eCNAM | eCNAM | Rel-15 |
| Feature or Study Item: HPLMN Radio Access Technology deployment Optimisation in Network Selection | HORNS | Rel-15 |
| Building Block: Stage 1 of MONASTERY | MONASTERY | Rel-15 |
