| Building Block: Deleted - GERAN | GERAN | R99 |
| Building Block: Open Service Access | OSA | R99 |
| Building Block: General Packet Radio Service enahancements | GPRSenhancements | R99 |
| Feature or Study Item: Speech Recognition and Speech Enabled Services | SRSES | Rel-6 |
| Feature or Study Item: WLAN-UMTS Interworking Rel-6 | WLAN | Rel-6 |
| Feature or Study Item: Network Sharing | NTShar | Rel-6 |
| Building Block: Overall architectural aspects of IP flow based bearer level charging | CH-FBC | Rel-6 |
| Feature or Study Item: PS domain and IMS impacts for supporting IMS Emergency calls (EMC1) | EMC1 | Rel-7 |
| Building Block: Study on Stage 2 for IMS-level solution | EMC1 | Rel-7 |
| Building Block: Deleted - Study on Stage 2 for One Tunnel solution | OPTUNEL-Study | Rel-7 |
| Building Block: Stage 2 specification for One Tunnel solution | OPTUNEL-Stage2 | Rel-7 |
| Building Block: Stage 1/2 for Towards AGNSS Concept | AGNSS | Rel-7 |
| Building Block: Deleted - TR on GRUU | GRUU | Rel-7 |
| Building Block: Stage 1,2 of GRUU | GRUU | Rel-7 |
| Feature or Study Item: One Tunnel solution for optimization of Packet Data Traffic | OPTUNEL | Rel-7 |
| Building Block: TISPAN Rel 1 related aspects | FBI-TIS1 | Rel-7 |
| Building Block: PacketCable Related aspects | FBI-PCBL | Rel-7 |
| Building Block: Deleted - TR on support of QoS on WLAN | WLANQOS | Rel-7 |
| Building Block: Stage 2 on support of QoS over 3GPP/WLAN interworking | WLANQOS | Rel-7 |
| Feature or Study Item: Identification of Communication Services in IMS | ServID | Rel-7 |
| Feature or Study Item: IP Interconnection of Services | IPinterc | Rel-8 |
| Building Block: Stage 2 CIMS_3GPP2 | CIMS_3GPP2 | Rel-8 |
| Feature or Study Item: IMS Service Continuity | IMS-Cont | Rel-8 |
| Building Block: Stage 2 IMS Service Continuity | IMS-Cont | Rel-8 |
| Feature or Study Item: IMS System enhancements for corporate network access | IMS_Corp | Rel-8 |
| Building Block: SA2 aspects of IMS_Corp | IMS_Corp | Rel-8 |
| Work task: Deleted (already covered) SAES-SA-FP_n3GPP Optimized Handover with CDMA | SAES-SA-FP_n3GPP-OptCDMA | Rel-8 |
| Work task: Stage 2 for Optimized Dual-Radio Handover with WiMAX | SAES-SA-FP_n3GPP-OptWIMAX | Rel-8 |
| Building Block: Voice Call Continuity for CDMA2000 1X | SAES-VCC_1X | Rel-8 |
| Work task: Stage 2 for IMS_NNI | IMS_NNI | Rel-8 |
| Building Block: High level and common (for all accesses) functions | EPS-ComF | Rel-8 |
| Work task: Stage 2 GPRS enhancements for LTE access | SAES-GPRS_LTE | Rel-8 |
| Feature or Study Item: 3GPP System Architecture Evolution Specification - Evolved Packet System (non RAN aspects) | SAES | Rel-8 |
| Feature or Study Item: Enhanced Home NodeB / eNodeB | EHNB | Rel-9 |
| Work task: Stage 2 for LCS Control Plane Solution for EPS | LCS_EPS-CPS | Rel-9 |
| Feature or Study Item: Support for IMS Emergency Calls over GPRS and EPS | IMS_EMER_GPRS_EPS | Rel-9 |
| Feature or Study Item: Access Network Discovery and Selection Function enhancements | eANDSF | Rel-9 |
| Building Block: Stage 2/3 for IMS Service Continuity Enhancements: Service, Policy and Interactions | IMS_SCC-SPI | Rel-9 |
| Building Block: Stage 2/3 for IMS Centralized Services | IMS_SCC-ICS | Rel-9 |
| Work task: SRVCC support for IMS Emergency Calls | IMS_EMER_GPRS_EPS-SRVCC | Rel-9 |
| Feature or Study Item: LCS for LTE and EPS | LCS_LTE_EPS | Rel-9 |
| Building Block: Stage 2 for Multiple PDN Connection to the Same APN for PMIP-based Interfaces | MUPSAP | Rel-9 |
| Building Block: Stage 2 for Access Network Discovery and Selection Function enhancements | eANDSF | Rel-9 |
| Building Block: Stage 2 for Relays for LTE | LTE_Relay | Rel-10 |
| Building Block: Stage 2 for Support of Multi-Operator Core Network by GERAN | MOCN-GERAN | Rel-10 |
| Feature or Study Item: Deleted - Enhanced Home NodeB / eNodeB continuation of Rel-9 | eEHNB | Rel-10 |
| Feature or Study Item: Multi Access PDN Connectivity | MAPCON | Rel-10 |
| Building Block: Stage 2 for Multi Access PDN Connectivity | MAPCON | Rel-10 |
| Feature or Study Item: Network Improvements for Machine-Type Communications | NIMTC | Rel-10 |
| Building Block: Deleted - TR on Stage 2 for Network Improvements for Machine-Type Communications | NIMTC | Rel-10 |
| Building Block: Stage 2 - IMS Inter-UE Transfer enhancements | IMS_SC_eIDT | Rel-10 |
| Feature or Study Item: IP-Short-Message-Gateway enhancements for CPM-SMS Interworking | CPM-SMS | Rel-10 |
| Building Block: Stage 2 for CPM-SMS | CPM-SMS | Rel-10 |
| Feature or Study Item: Local IP Access and Selected Internet IP Traffic Offload | LIPA_SIPTO | Rel-10 |
| Feature or Study Item: Study on System enhancements for the use of IMS services in Local BreakOut and Optimal Routing of Media | FS_IMS_LBO_ORM | Rel-10 |
| Feature or Study Item: Study on Intra Domain Connection of RAN Nodes to Multiple CN Nodes | FS_IDC | Rel-10 |
| Feature or Study Item: Enhancements for Multimedia Priority Service | eMPS | Rel-10 |
| Building Block: TR on SRVCC for eMPS | eMPS_SRVCC | 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: 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: LOcation-Based Selection of gaTEways foR WLAN | LOBSTER | Rel-11 |
| Building Block: Stage 2 for QoS Control Based on Subscriber Spending Limits | QoS_SSL | Rel-11 |
| Feature or Study Item: Study on Roaming Architecture for Voice over IMS with Local Breakout | FS_RAVEL | Rel-11 |
| Feature or Study Item: Data Identification in Access Network Discovery and Selection Function (ANDSF) | DIDA | Rel-11 |
| Work task: Deleted - MTC Feature Control (described in TS 22.368, clause 7.1.1 and 23.888, clause 5.7) | SIMTC-Reach | Rel-11 |
| Work task: Deleted - Effectively maintain connectivity for a large number of MTC Devices (TS 22.368, 7.1.1) | SIMTC-Sig | Rel-11 |
| Work task: Deleted - Charging Requirements (TS 22.368, 7.1.5) | SIMTC-CN_Pow | Rel-11 |
| Feature or Study Item: Service Identification for RRC Improvements in GERAN (Stage 2/3) | SIRIG | Rel-11 |
| Building Block: Stage 2 for S2a Mobility based On GTP and WLAN access to EPC | SaMOG_WLAN | Rel-11 |
| Feature or Study Item: Roaming Architecture for Voice over IMS with Local Breakout | RAVEL | Rel-11 |
| Feature or Study Item: Enhanced S2a Mobility Over trusted WLAN access to EPC | eSaMOG | Rel-12 |
| Feature or Study Item: Optimized Offloading to WLAN in 3GPP-RAT Mobility | WORM | Rel-12 |
| Feature or Study Item: Network-provided Location information for IMS Trusted WLAN Access Network (TWAN) case | NETLOC_TWAN | Rel-12 |
| Building Block: Stage 2 for Enhanced S2a Mobility Over trusted WLAN access to EPC | eSaMOG-SA2 | Rel-12 |
| Building Block: Stage 2 for Optimized Offloading to WLAN in 3GPP-RAT Mobility | WORM-SA2 | Rel-12 |
| Building Block: Stage 2 for Network-provided Location information for IMS Trusted WLAN Access Network (TWAN) case | NETLOC_TWAN-SA2 | Rel-12 |
| Building Block: Stage 2 for Dual Radio VCC enhancements | eDRVCC | Rel-12 |
| Building Block: Stage 2 for Application Based Charging | ABC-SA2 | Rel-12 |
| Feature or Study Item: Group Communication System Enablers for LTE | GCSE_LTE | 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: BB2: Policy and Charging Control for 3GPP UEs connected to BroadBand Forum access network as Trusted network in Interworking scenario (P4C-TI) | P4C-TI | Rel-12 |
| Building Block: Stage 2 for IMS Business Trunking for IP-PBX in Static Mode of Operation | BusTI-SA2 | Rel-12 |
| Building Block: Stage 2 for WLAN Network Selection for 3GPP Terminals | WLAN_NS-SA2 | Rel-12 |
| Building Block: Deleted - BB3: Policy and Charging Control for 3GPP UEs connected to fixed broadband access network via S2b and S2c reference points for EPC routed traffic (P4C-S2bc) | P4C-S2bc | Rel-12 |
| Building Block: Deleted - BB4: Group based MTC feature (GROUP) | MTCe-GROUP | Rel-12 |
| Building Block: Deleted - BB4: Policy and Charging Control for EPC routed traffic over fixed broadband access networks of 3GPP UEs connected via H(e)NB in convergent scenarios (P4C-HeNB) | P4C-HeNB | Rel-12 |
| Feature or Study Item: Study on Optimized Offloading to WLAN in 3GPP-RAT Mobility | FS_WORM | Rel-12 |
| Feature or Study Item: Study on Application Based Charging | FS_ABC | Rel-12 |
| Feature or Study Item: Deleted - Study on IP Flow Mobility support for S2a and S2b Interfaces | FS_NBIFOM | Rel-12 |
| Feature or Study Item: Usage Monitoring Control PCC enhancement | UMONC | Rel-12 |
| Building Block: Stage 2 for Usage Monitoring Control PCC enhancement | UMONC | Rel-12 |
| Building Block: TR on Stage 2 for Operator Policies for IP Interface Selection | OPIIS | 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 Core Network Overload solutions | FS_CNO | Rel-12 |
| Feature or Study Item: Interworking between Mobile Operators using the Evolved Packet System and Data Application Providers | MOSAP | Rel-12 |
| Feature or Study Item: LIPA Mobility and SIPTO at the Local Network | LIMONET | Rel-12 |
| Building Block: Study on Core Network Overload solutions (Phase 1) | FS_CNO | Rel-12 |
| Building Block: SA2 part of Study on IMS based Peer-to-Peer Content Distribution Services (Stage 2) | FS_IMS_P2P_CDS | Rel-12 |
| Building Block: Study on Core Network Overload solutions (Phase 2) | FS_CNO | Rel-12 |
| Feature or Study Item: Study on System Enhancements for Energy Efficiency | FS_SEEE | Rel-12 |
| Work task: Deleted - Stage 2 for stand-alone L-GW and associated Mobility for LIPA and SIPTO at the Local Network | LIMONET-LIPA-del1 | Rel-12 |
| Building Block: TR on Stage 2 for LIPA Mobility and SIPTO at the Local Network | LIMONET-SA3 | Rel-12 |
| Building Block: SA2 Study on Architecture Enhancements at the EPS and IMS Level to Support MCPTT | MCPTT | Rel-13 |
| Building Block: Stage 2 for Isolated E-UTRAN Operation for Public Safety | IOPS | Rel-13 |
| Building Block: Stage 2 of Support of Emergency services over WLAN - phase 1 | SEW1 | Rel-13 |
| Building Block: Stage 2 for Extended DRX cycle for Power Consumption | eDRX | Rel-13 |
| Building Block: Deleted: SA2 aspects for MCPTT | MCPTT | Rel-13 |
| Building Block: SA2 part of Study on Usage Monitoring Control PCC Enhancement | FS_UMONC_sas | Rel-13 |
| Feature or Study Item: Study on Usage Monitoring Enhancements for Service, Application and Subscriber Group | FS_UMONC_sas | Rel-13 |
| Building Block: TR on Stage 2 for User Plane Congestion management | UPCON-SA2TR | Rel-13 |
| Building Block: Deleted - Stage 2 for User Plane Congestion management | UPCON-SA2Del | Rel-13 |
| Feature or Study Item: User Plane Congestion management | UPCON | Rel-13 |
| Feature or Study Item: Study on Phase 1 of the Support of Emergency services over WLAN | FS_SEW | Rel-13 |
| Building Block: TR for SRVCC Enhancements for Transcoding Avoidance | SETA-SA2TR | Rel-13 |
| Building Block: TR on Stage 2 for Enhancements to Proximity-based Services - Extensions | eProSe-Ext-SA2TR | Rel-13 |
| Building Block: TR for Dedicated Core Networks | DECOR | Rel-13 |
| Building Block: TR for IP Flow Mobility support for S2a and S2b Interfaces | NBIFOM-SA2TR | Rel-13 |
| Building Block: TR for Architecture Enhancements for Service capability Exposure | AESE | Rel-13 |
| Building Block: TR for Monitoring Enhancements | MONTE | Rel-13 |
| Building Block: TR for Group based Enhancements | GROUPE | Rel-13 |
| Building Block: TR for Enhanced CS Fallback (CSFB) | eCSFB | Rel-13 |
| Building Block: Stage 2 for Double Resource Reuse for Multiple Media Sessions | DRuMS-SA2 | Rel-13 |
| Building Block: Stage 2 for Enhancements to WEBRTC interoperability | eWebRTCi | Rel-13 |
| Building Block: Stage 2 for Improvements to CS/PS coordination in UTRAN/GERAN Shared Networks | CSPS_Coord-SA2 | Rel-13 |
| Building Block: BB1: RAN Downlink Traffic Differentiation, Congestion Detection and Reporting | UPCON-DOTCON | Rel-13 |
| Building Block: Deleted - BB2: Application and Content Prioritization | UPCON-CONDEL | Rel-13 |
| Building Block: Deleted - BB3: Uplink traffic and attended/unattended traffic | UPCON-TRAFDEL | Rel-13 |
| Feature or Study Item: Enhancements to Proximity-based Services | eProSe | Rel-13 |
| Building Block: Stage 2 for Enhancements to Proximity-based Services - Extensions | eProSe-Ext-SA2 | Rel-13 |
| Building Block: Specification for the Le interface | LCS1-Le | Rel-5 |
| Building Block: Event Based and Periodic LCS | LCS1-EBP | Rel-5 |
| Building Block: New security aspects of LCS | LCS1-SEC | Rel-5 |
| Building Block: Robust Call Setup for VoLTE subscriber in LTE | RobVoLTE | Rel-14 |
| Building Block: Service Domain Centralization | SeDoC | Rel-14 |
| Work task: System Architecture Enhancements for TV service | AE_enTV | Rel-14 |
| Building Block: Stage 2 of Extended architecture support for Cellular Internet of Things | CIoT_Ext | Rel-14 |
| Building Block: Stage 2 of PS Data Off | PS_DATA_OFF | Rel-14 |
| Work task: Study on System Architecture Enhancements to eMBMS for TV Video Service | FS_AE_enTV | Rel-14 |
| Building Block: Non-IP for Cellular IoT for EC-EGPRS | NonIP_GPRS | Rel-14 |
| Feature or Study Item: Support of Emergency services over WLAN - phase 2 | SEW2 | Rel-14 |
| Feature or Study Item: T-ADS supporting WLAN Access | TADS_WLAN | Rel-14 |
| Building Block: Stage 2 of Enhancement to Flexible Mobile Service Steering | eFMSS | Rel-14 |
| Building Block: Study on Stage 2 of PS Data off function | FS_PS_DATA_OFF | Rel-14 |
| Building Block: Study on extended architecture support for Cellular Internet of Things | FS_CIoT_Ext | Rel-14 |
| Building Block: Enhancements of Dedicated Core Networks selection mechanism | eDecor | Rel-14 |
| Building Block: Control and User Plane Separation of EPC nodes | CUPS | Rel-14 |
| Building Block: Architecture enhancements for LTE support of V2X services | V2XARC | Rel-14 |
| Feature or Study Item: Group based enhancements in the network capability exposure functions | GENCEF | Rel-14 |
| Building Block: Group based enhancements in the network capability exposure functions | GENCEF | Rel-14 |
| Building Block: S8 Home Routing Architecture for VoLTE | V8 | Rel-14 |
| Building Block: Support of Emergency services over WLAN - phase 2 | SEW2 | Rel-14 |
| Building Block: Improvements of awareness of user location change | AULC | Rel-14 |
| Feature or Study Item: Service Domain Centralization | SeDoC | Rel-14 |
| Building Block: Sponsored data connectivity improvements | SDCI | Rel-14 |
| Feature or Study Item: Usage Monitoring Control PCC Extension | eUMONC | Rel-13 |
| Building Block: Flexible Mobile Service Steering TR Phase | FMSS-SA2TR | Rel-13 |
| Building Block: Flexible Mobile Service Steering - Stage 2 | FMSS-SA2 | Rel-13 |
| Building Block: Study on Extended DRX cycle for Power Consumption Optimization | FS_eDRX | Rel-13 |
| Feature or Study Item: MBMS Enhancements | MBMS_enh | Rel-13 |
| Building Block: MBMS Enhancements TR Phase | FS_MBMS_enh_TR | Rel-13 |
| Building Block: Deleted (not approved) - MBMS Enhancements - Stage 2 | MBMS_enh_TS | Rel-13 |
| Building Block: Stage 2 of Usage Monitoring Control PCC Extension | eUMONC-SA2 | Rel-13 |
| Building Block: Deleted - Stage 2 for SRVCC Enhancements for Transcoding Avoidance | SETA-SA2 | Rel-13 |
| Feature or Study Item: Flexible Mobile Service Steering | FMSS | Rel-13 |
| Feature or Study Item: SRVCC Enhancements for Transcoding Avoidance | SETA | Rel-13 |
| Building Block: Study on Optimizations to support High Latency communications | FS_HLcom | Rel-13 |
| Building Block: Stage 2 for voice over E-UTRAN Paging Policy Differentiation | voE_UTRAN_PPD-SA2 | Rel-13 |
| Building Block: Stage 2 for Dedicated Core Networks | DECOR | Rel-13 |
| Building Block: Stage 2 for IP Flow Mobility support for S2a and S2b Interfaces | NBIFOM-SA2 | Rel-13 |
| Building Block: Stage 2 for Architecture Enhancements for Service capability Exposure | AESE | Rel-13 |
| Building Block: Stage 2 for Monitoring Enhancements | MONTE | Rel-13 |
| Building Block: Stage 2 for Group based Enhancements | GROUPE | Rel-13 |
| Building Block: Deleted - Stage 2 for Enhanced CS Fallback (CSFB) | eCSFB | Rel-13 |
| Building Block: TR on Stage 2 for Enhancements to WEBRTC interoperability | eWebRTCi | Rel-13 |
| Feature or Study Item: voice over E-UTRAN Paging Policy Differentiation | voE_UTRAN_PPD | Rel-13 |
| Feature or Study Item: Dedicated Core Networks | DECOR | Rel-13 |
| Feature or Study Item: IP Flow Mobility support for S2a and S2b Interfaces | NBIFOM | Rel-13 |
| Feature or Study Item: Architecture Enhancements for Service capability Exposure | AESE | Rel-13 |
| Feature or Study Item: Monitoring Enhancements | MONTE | Rel-13 |
| Feature or Study Item: Group based Enhancements | GROUPE | Rel-13 |
| Feature or Study Item: Enhanced CS Fallback (CSFB) | eCSFB | Rel-13 |
| Feature or Study Item: Double Resource Reuse for Multiple Media Sessions | DRuMS | Rel-13 |
| Building Block: Interactions OSA - e-commerce | OSA1-ECOM | Rel-5 |
| Building Block: IMS Charging | OAM-CH | Rel-5 |
| Feature or Study Item: Handling of early Ues | LATE_UE | Rel-5 |
| Building Block: Modification of core network protocols for GERAN Inter BSC NACC over Gb Interface | GERNACC-Cnmod | Rel-5 |
| Building Block: MBMS Enhancements | MBMS_enh_St2 | Rel-13 |
| Feature or Study Item: Extended DRX cycle for Power Consumption | eDRX | Rel-13 |
| Feature or Study Item: Support of Emergency services over WLAN phase 1 | SEW1 | Rel-13 |
| Feature or Study Item: Study on the Support of Emergency services over WLAN | FS_SEW | Rel-13 |
| Building Block: Stage 2 of CIoT | CIoT | Rel-13 |
| Feature or Study Item: End to End QoS for PS Domain including IMS | E2EQoS | Rel-5 |
| Building Block: TR on Stage 2 for Improvements to CS/PS coordination in UTRAN/GERAN Shared Networks | CSPS_Coord-SA2TR | Rel-13 |
| Work task: Stage 2 for RAN Downlink Traffic Differentiation, Congestion Detection and Reporting | UPCON-DOTCON-SA2 | Rel-13 |
| Feature or Study Item: Enhancements to WEBRTC interoperability | eWebRTCi | Rel-13 |
| Feature or Study Item: Improvements to CS/PS coordination in UTRAN/GERAN Shared Networks | CSPS_Coord | Rel-13 |
| Building Block: GERAN Header adaptation | GERIMS-HEADAPT | Rel-5 |
| Building Block: Deleted - GERAN Radio access bearer design for IMS | GERIMS-RABDES | Rel-5 |
| Feature or Study Item: Intra Domain Connection of RAN Nodes to Multiple CN Nodes | IUFLEX | Rel-5 |
| Building Block: OSA APIs for Multimedia Call Control | OSA1-CSCF | Rel-5 |
| Building Block: Retrieval of Terminal capabilities | OSA2-TC | 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 |
| Building Block: Call control and roaming to support IMS in UMTS | IMS-CCR | Rel-5 |
| Building Block: BB1: Small Data and Device Triggering Enhancements (SDDTE) | MTCe-SDDTE | Rel-12 |
| Building Block: BB1: Policy and Charging Control for supporting traffic from fixed terminals and NSWO (Non Seamless WLAN Offload) traffic from 3GPP UEs in fixed broadband access networks (P4C-F) | P4C-F | 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 |
| Building Block: Deleted - Stage 2 for IMS Registration Control | IMS_RegCon-del2 | Rel-12 |
| Feature or Study Item: Web Real Time Communication access to IMS | IMS_WebRTC | Rel-12 |
| Building Block: TR on Stage 2 for Proximity-based Services | ProSe-SA2TR | Rel-12 |
| Building Block: Stage 2 for Proximity-based Services | ProSe-SA2 | Rel-12 |
| Building Block: Stage 2 for SMS submit and delivery without MSISDN in IMS | SMSMI-SA2 | Rel-12 |
| Building Block: Deleted - Stage 2 for Security aspects of Public Warning System | PWS_Sec-del3 | Rel-12 |
| Building Block: TR on Stage 2 for SMS submit and delivery without MSISDN in IMS | SMSMI-SA2TR | Rel-12 |
| Feature or Study Item: Short Message Service (SMS) submit and delivery without MSISDN in IMS | SMSMI | Rel-12 |
| Building Block: TR on Stage 2 for MOSAP | MOSAP-SA2TR | Rel-12 |
| Building Block: Deleted - Stage 2 for MOSAP | MOSAP-SA2Del | Rel-12 |
| Building Block: BB1: SIPTO at the Local Network | LIMONET-SIPTO | Rel-12 |
| Building Block: Deleted - BB2: Stand-alone L-GW and associated Mobility for LIPA and SIPTO at the Local Network | LIMONET-LIPA | Rel-12 |
| Work task: Stage 2 for SIPTO at the Local Network | LIMONET-SIPTO-SA2 | Rel-12 |
| Feature or Study Item: Operator Policies for IP Interface Selection | OPIIS | Rel-12 |
| Feature or Study Item: Study on S2a Mobility based On GTP and WLAN access to EPC | FS_SaMOG | Rel-12 |
| Building Block: Stage 2 for Operator Policies for IP Interface Selection | OPIIS | Rel-12 |
| Feature or Study Item: Study on Multi Access PDN connectivity and IP flow Mobility | FS_MAPIM | Rel-12 |
| Building Block: SA2 part of Study on Multi Access PDN connectivity and IP flow Mobility | FS_MAPIM | Rel-12 |
| Feature or Study Item: Study on architecture enhancements for Public Safety | FS_IOPS_St2 | Rel-13 |
| Building Block: TR on Architecture enhancements to support Group Communication System Enablers for LTE | GCSE_LTE | Rel-12 |
| Building Block: Stage 2 for Group Communication System Enablers for LTE | GCSE_LTE | Rel-12 |
| Feature or Study Item: Application Based Charging | ABC | Rel-12 |
| Building Block: Optimizations to Support High Latency Communications | HLcom | Rel-13 |
| Building Block: Stage 2 for LTE-HRPD (High Rate Packet Data in 3GPP2) inter-RAT SON | LTE_HRPD_SON | Rel-12 |
| Feature or Study Item: Core Network Overload - User Location Information reporting improvement | CNO_ULI | Rel-12 |
| Feature or Study Item: Optimizations to Support High Latency Communications | HLcom | Rel-13 |
| Feature or Study Item: Study on architecture enhancements of cellular systems for ultra low complexity and low throughput Internet of Things | FS_AE_CIoT | Rel-13 |
| Feature or Study Item: LTE-HRPD (High Rate Packet Data in 3GPP2) inter-RAT SON | LTE_HRPD_SON | Rel-12 |
| Building Block: TR on Stage 2 for Web Real Time Communication access to IMS | IMS_WebRTC | Rel-12 |
| Building Block: Stage 2 for Web Real Time Communication access to IMS | IMS_WebRTC | Rel-12 |
| Building Block: SA2 part of Dual connectivity for LTE | LTE_SC_enh_dualC-S2 | Rel-12 |
| Feature or Study Item: Dual connectivity for LTE | LTE_SC_enh_dualC | Rel-12 |
| Feature or Study Item: WLAN/3GPP Radio Interworking | UTRA_LTE_WLAN_interw | Rel-12 |
| Feature or Study Item: Deleted - IMS Registration Control | IMS_RegCon | Rel-12 |
| Building Block: Stage 2 for Data Identification in ANDSF | DIDA | Rel-11 |
| Feature or Study Item: Full Support of Multi-Operator Core Network by GERAN | Full_MOCN-GERAN | Rel-11 |
| Building Block: BB1: Stage 2 Reachability Aspects of SIMTC | SIMTC-Reach | Rel-11 |
| Building Block: Deleted - BB2: Stage 2 Signalling Optimizations of SIMTC | SIMTC-Sig | Rel-11 |
| Building Block: Deleted - BB3: Stage 2 CN-based requirements and Power Considerations of SIMTC | SIMTC-CN_Pow | Rel-11 |
| Work task: MTC Addressing | SIMTC-Reach | Rel-11 |
| Work task: Deleted - MTC Monitoring (TS 22.368, 7.2.8) | SIMTC-CN_Pow | Rel-11 |
| Work task: Identifiers especially removal of MSISDN dependencies in the architecture | SIMTC-Reach | Rel-11 |
| Work task: MSISDN-less / PS-Only | SIMTC-Reach | Rel-11 |
| Feature or Study Item: Single Radio Voice Call Continuity from UTRAN/GERAN to E-UTRAN/HSPA | rSRVCC | Rel-11 |
| Building Block: Stage 2 for Core Network Overload - User Location Information reporting improvement | CNO_ULI-SA2 | Rel-12 |
| Work task: On-line device trigger | SIMTC-Reach | Rel-11 |
| Work task: Deleted - Small Data Transmissions (TS 22.368, 7.2.5) | SIMTC-Sig | Rel-11 |
| Work task: Deleted - Lower Power Consumption (TS 22.368, 7.1.1) | SIMTC-CN_Pow | Rel-11 |
| Building Block: Stage 2 for Service Identification for RRC Improvements in GERAN | SIRIG | Rel-11 |
| Building Block: Stage 2 for Gateway Core Network Sharing for GERAN | Full_MOCN-GERAN-GWCN | Rel-11 |
| Feature or Study Item: IMS Overload Control | IOC | Rel-11 |
| Building Block: Stage 2 for IMS Overload Control | IOC | Rel-11 |
| Building Block: Deleted - BB5: Policy and Charging Control for supporting Layer 2 traffic in fixed broadband access network (P4C-FL2) | P4C-FL2 | Rel-12 |
| Work task: TR on Stage 2 BB1: Small Data and Device Triggering Enhancements | MTCe-SDDTE | Rel-12 |
| Building Block: Deleted - BB6: Policy and Charging Control for 3GPP UEs connected to fixed broadband access networks via S2a reference point for EPC routed traffic in convergence (P4C-TC) | P4C-TC | Rel-12 |
| Work task: TR on Stage 2 for BB1: Policy and Charging Control for supporting traffic from fixed terminals and NSWO traffic from 3GPP UEs in fixed broadband access networks (P4C-F) | P4C-F-SA2TR | Rel-12 |
| Work task: TR on Stage 2 for BB2: Policy and Charging Control for 3GPP UEs connected to BroadBand Forum access network as Trusted network in Interworking scenario (P4C-TI) | P4C-TI-SA2TR | Rel-12 |
| Work task: TR on Stage 2 BB3: UE Power Consumptions Optimizations (UEPCOP) | MTCe-UEPCOP | Rel-12 |
| Work task: Stage 2 for BB1: Small Data and Device Triggering Enhancements | MTCe-SDDTE | Rel-12 |
| Work task: Stage 2 for BB1: Policy and Charging Control for supporting traffic from fixed terminals and NSWO traffic from 3GPP UEs in fixed broadband access networks (P4C-F) | P4C-F-SA2 | Rel-12 |
| Work task: Stage 2 for BB2: Policy and Charging Control for 3GPP UEs connected to BroadBand Forum access network as Trusted network in Interworking scenario (P4C-TI) | P4C-TI-SA2 | Rel-12 |
| Work task: Stage 2 for BB3: UE Power Consumptions Optimizations (UEPCOP) | MTCe-UEPCOP | Rel-12 |
| Building Block: Deleted - BB2: Monitoring Enhancements (MONTE) | MTCe-MONTE | Rel-12 |
| Feature or Study Item: Deleted - Study on enhancements to IMS border functions for IMS Interconnection of services | FS_eIMS_IBCF | Rel-10 |
| Feature or Study Item: Deleted - GTP-based S8 chaining | GTPchaining | Rel-10 |
| Building Block: Deleted - Stage 2 for GTPchaining | GTPchaining | Rel-10 |
| Building Block: IMS aspects of Architecture for Home NodeB | EHNB-IMS | Rel-10 |
| Building Block: Stage 2 for Optimal Media Routing | OMR | Rel-10 |
| Work task: Stage 2 on eMPS for CSFB | ePRIOR-St2 | Rel-10 |
| Work task: Stage 2 on eMPS for EPS Bearer Service | ePRIOR-St2 | Rel-10 |
| Work task: Stage 2 on eMPS for IMS Aspects | ePRIOR-St2 | Rel-10 |
| Building Block: Stage 2 for Roaming Architecture for Voice over IMS with Local Breakout | RAVEL | Rel-11 |
| Feature or Study Item: IMS Emergency Session Enhancements | IESE | Rel-10 |
| Building Block: Stage 2 for IMS Emergency Session Enhancements | IESE | Rel-10 |
| Feature or Study Item: Study on Single Radio Video Call Continuity for 3G-CS | FS_vSRVCC | Rel-10 |
| Feature or Study Item: Study on S2b Mobility based on GTP | FS_SMOG | Rel-10 |
| Building Block: Stage 2 for Non Voice Emergency Services (Support of IMS Emergency Sessions with Other Media on UTRAN and E-UTRAN) | NOVES-IMSESOM | Rel-11 |
| Feature or Study Item: S2a Mobility based On GTP and WLAN access to EPC | SaMOG_WLAN | Rel-11 |
| Building Block: Stage 2 for Single Radio Voice Call Continuity from UTRAN/GERAN to E-UTRAN/HSPA | rSRVCC | Rel-11 |
| Building Block: TR on Local IP Access and Selected Internet IP Traffic Offload | LIPA_SIPTO | Rel-10 |
| Building Block: Stage 2/3 for SIPTO for macro networks | SIPTO | Rel-10 |
| Feature or Study Item: IP Flow Mobility and seamless WLAN offload | IFOM | Rel-10 |
| Building Block: Stage 2 for IP Flow Mobility and seamless WLAN offload | IFOM | Rel-10 |
| Feature or Study Item: Enabling Coder Selection and Rate Adaptation for UTRAN and E-UTRAN for Load Adaptive Applications | ECSRA_LAA | Rel-10 |
| Building Block: TR on Enabling Coder Selection and Rate Adaptation for UTRAN and E-UTRAN for Load Adaptive Applications | ECSRA_LAA | Rel-10 |
| Building Block: Stage 2 for Enabling Coder Selection and Rate Adaptation for UTRAN and E-UTRAN for Load Adaptive Applications | ECSRA_LAA | Rel-10 |
| Feature or Study Item: Optimal Media Routing | OMR | Rel-10 |
| Building Block: Stage 2 on enhancements for Multimedia Priority Service | ePRIOR-St2 | Rel-10 |
| Feature or Study Item: Extended H(e)NB features | EHNBF | Rel-10 |
| Work task: Stage 2 for SIPTO for macro networks | SIPTO | Rel-10 |
| Building Block: Stage 2/3 for Local IP Access | LIPA | Rel-10 |
| Work task: Stage 2 for Local IP Access | LIPA | Rel-10 |
| Feature or Study Item: Relays for LTE | LTE_Relay | Rel-10 |
| Building Block: SA2 aspects of WLAN/3GPP Radio Interworking | UTRA_LTE_WLAN_interw-SA2 | Rel-12 |
| Building Block: Deleted - Stage 2 for RED | RED | Rel-10 |
| Feature or Study Item: Study on Single Radio Voice Call Continuity from UTRAN/GERAN to E-UTRAN/HSPA | FS_rSRVCC | Rel-11 |
| Feature or Study Item: Support for BroadBand Forum Accesses Interworking | BBAI | Rel-11 |
| Feature or Study Item: Study on IMS based Peer-to-Peer Content Distribution Services | FS_IMS_P2P | Rel-11 |
| Building Block: TR on Stage 2 for BBAI | BBAI | Rel-11 |
| Building Block: Stage 2 BB I: BBF interworking with home routed traffic for WLAN and H(e)NB | BBAI | Rel-11 |
| Building Block: Stage 2 BB II: BBF interworking with offload in access network for WLAN and for H(e)NB | BBAI_BBII-CTofldS2 | Rel-11 |
| Feature or Study Item: Study on IMS Evolution | FS_eIMS | Rel-11 |
| Feature or Study Item: Study on Policy solutions and enhancements | FS_PP | Rel-11 |
| Feature or Study Item: Study on IPv6 Migration | FS_IP6M | Rel-11 |
| Feature or Study Item: Deleted - Harmonization of Gq'/Rx for Common IMS | IMS_Comm_GqRx_Harm | Rel-9 |
| Feature or Study Item: Deleted - SAES Enhancements (non RAN aspects) | SAES_Ph2 | Rel-9 |
| Building Block: Deleted - CS over EPS | SAES_Ph2 | Rel-9 |
| Building Block: Deleted - SAE for generic support for non-3GPP accesses | SAES_Ph2 | Rel-9 |
| Work task: Deleted - Single Radio Aspects of SAE for Optimized Handover with WiMAX | SAES_Ph2 | Rel-9 |
| Feature or Study Item: System aspects of vocoder rate adaptation for LTE | LTEimp-Vocoder | Rel-9 |
| Building Block: SA2 system aspects of vocoder rate adaptation for LTE | LTEimp-Vocoder | Rel-9 |
| Work task: MTC related interfaces and functional entities to support above features (MTCsp, etc.) | SIMTC-Reach | Rel-11 |
| Building Block: Architecture aspects of EHNB | EHNB | Rel-9 |
| Feature or Study Item: IMS Services Centralization and Continuity | IMS_SCC | Rel-9 |
| Work task: Stage 2 for IMS Service Continuity Enhancements: Service, Policy and Interactions | IMS_SCC-SPI | Rel-9 |
| Work task: Stage 2 for IMS Centralized Services | IMS_SCC-ICS | Rel-9 |
| Building Block: Stage 2 for IMS Emergency Calls over GPRS and EPS | IMS_EMER_GPRS_EPS | Rel-9 |
| Building Block: Single Radio Voice Call Continuity (SRVCC) support for IMS Emergency Calls | IMS_EMER_GPRS_EPS-SRVCC | Rel-9 |
| Building Block: Stage 2 for Single Radio Video Call Continuity for 3G-CS | vSRVCC | Rel-11 |
| Building Block: Stage 2 for Service Awareness and Privacy Policies | SAPP | Rel-11 |
| Building Block: Stage 2 for VPLMN Autonomous CSG Roaming | VCSG | Rel-11 |
| Building Block: TR on Stage 2 aspects of Optimized Service Charging and Allocation of Resources in IMS whilst Roaming | OSCAR | Rel-11 |
| Building Block: Deleted - Stage 2 for Optimized Service Charging and Allocation of Resources in IMS whilst Roaming | OSCAR | Rel-11 |
| Building Block: Stage 2 for Advanced IP Interconnection of Services | IPXS | Rel-11 |
| Feature or Study Item: Single Radio Video Call Continuity for 3G-CS | vSRVCC | Rel-11 |
| Feature or Study Item: Multiple PDN Connection to the Same APN for PMIP-based Interfaces | MUPSAP | Rel-9 |
| Building Block: Deleted - SA2 part of 128 bit encryption for GSM and GPRS | A5/4-GEA4 | Rel-9 |
| Feature or Study Item: Non Voice Emergency Services | NOVES | Rel-11 |
| Feature or Study Item: Service Awareness and Privacy Policies | SAPP | Rel-11 |
| Feature or Study Item: VPLMN Autonomous CSG Roaming | VCSG | Rel-11 |
| Building Block: Deleted - Stage 2 on SA2 part for System Improvements to Machine-Type Communications | SIMTC | Rel-11 |
| Building Block: TR on Stage 2 for SIMTC | SIMTC | Rel-11 |
| Building Block: Stage 2 on SRVCC for eMPS | eMPS_SRVCC | Rel-11 |
| Building Block: Stage 2 for Network-provided Location information for IMS | NWK-PL2IMS | Rel-11 |
| Building Block: TR on Stage 2 for Network-provided Location information for IMS | NWK-PL2IMS | Rel-11 |
| Feature or Study Item: Single Radio Voice Call Continuity (SRVCC) aspect of enhancements for Multimedia Priority Service | eMPS_SRVCC | Rel-11 |
| Feature or Study Item: S2b Mobility based on GTP | SMOG | Rel-10 |
| Feature or Study Item: Study on Architecture of IMS based Customized Alerting Tone (CAT) | FS_CAT-St2 | Rel-8 |
| Feature or Study Item: 3GPP2 Input to Common IMS | CIMS_3GPP2 | Rel-8 |
| Building Block: CS Fallback in EPS | SAES-CSFB | Rel-8 |
| Building Block: System enhancements for the use of IMS services in local breakout | SAES-IMS_LBO | Rel-8 |
| Feature or Study Item: Deleted - Study on Evaluation of LCS Control Plane Solution for EPS | FS_LCS_EPS | Rel-8 |
| Feature or Study Item: Maintenance of TISPAN documentation | MAINTISP | Rel-8 |
| Feature or Study Item: Study on centralized IMS service control | FS_ICS | Rel-8 |
| Building Block: Stage 2 for ICS Requirement and Architecture | ICSRA-St2 | Rel-8 |
| Building Block: Documentation of TISPAN NGN R1 and R2 in 3GPP SA2 | IMS_Comm_Doc | Rel-8 |
| Building Block: Maintenance of TISPAN release 2 common IMS | IMS_Comm_Mtce8 | Rel-8 |
| Building Block: Stage 2 for Mobility between 3GPP-WLAN Interworking and 3GPP Systems | IWLAN_Mob | Rel-8 |
| Building Block: SA2 aspects of ETWS | ETWS | Rel-8 |
| Work task: Stage 2 for CS Fallback in EPS | SAES-CSFB | Rel-8 |
| Work task: Stage 2 for 2G/3G SRVCC | SAES-SRVCC | Rel-8 |
| Feature or Study Item: Deleted - Study on Mobility between 3GPP-WLAN Interworking and 3GPP Systems | FS_SM3GWLAN | Rel-8 |
| Building Block: Deleted - SA aspects of System Architecture Evolution | SAES-SA | Rel-8 |
| Work task: Stage 2 for High level functions | SAES-SA-HLF | Rel-8 |
| Building Block: SAE for LTE access | SAES-LTE | Rel-8 |
| Building Block: SAE for Interoperation between LTE and legacy cellular PS accesses | SAES-SA-FP_3GPP | Rel-8 |
| Building Block: SAE for support for non-3GPP accesses | SAES-SA-FP_n3GPP | Rel-8 |
| Feature or Study Item: Earthquake and Tsunami Warning System | ETWS | Rel-8 |
| Building Block: Stage 2 for S2b Mobility based on GTP | SMOG | Rel-10 |
| Feature or Study Item: Support of Multi-Operator Core Network by GERAN | MOCN-GERAN | Rel-10 |
| Building Block: Stage 2 for Network Improvements for Machine-Type Communications | NIMTC | Rel-10 |
| Work task: Stage 2 for SAES-SA-FP_LTE with GTP variant | SAES-SA-FP_LTE-GTP-St2 | Rel-8 |
| Work task: Stage 2 for SAES-SA-FP_LTE with PMIP variant | SAES-SA-FP_LTE-IETF-St2 | Rel-8 |
| Work task: Stage 2 for Interoperation between LTE and 2G/3G | EPSto2_3G | Rel-8 |
| Work task: Stage 2 for Interoperation between LTE and CDMA2000 | EPStoC2k | Rel-8 |
| Feature or Study Item: IMS Centralized Service control | ICSRA | Rel-8 |
| Feature or Study Item: IMS Enhancements for support of Packet Cable access | PktCbl | Rel-8 |
| Building Block: IMS Enhancements for Cable Client Types and Deployment Models | PktCbl-Deploy | Rel-8 |
| Work task: Architecture aspects of PktCbl-Deploy | PktCbl-Deploy | Rel-8 |
| Building Block: IMS Inter-working aspects in Support of Cable Regulatory requirements | PktCbl-Intw | Rel-8 |
| Work task: Architecture aspects of PktCbl-Interwork | PktCbl-Intw | Rel-8 |
| Building Block: Deleted (covered by 380068): Functions and procedures for SAE to support LCS | SAES-SA-FP_LCS | Rel-8 |
| Building Block: Single Radio Voice Call Continuity for 3GPP (SRVCC) | SAES-SRVCC | Rel-8 |
| Building Block: SAE impacts on IMS | SAES-SA_IMS | Rel-8 |
| Building Block: Deleted (covered by 380064): SAE aspects of Emergency Calls | SAES-SA-EmCall | Rel-8 |
| Work task: SAES-SA-FP_LTE with GTP variant | SAES-SA-FP_LTE-GTP | Rel-8 |
| Work task: SAES-SA-FP_LTE with PMIP variant | SAES-SA-FP_LTE-IETF | Rel-8 |
| Work task: Stage 2 for Host-based Mobility aspects | SAES-SA-FP_n3GPP-HBMob | Rel-8 |
| Work task: Stage 2 for Network-based Mobility aspects | SAES-SA-FP_n3GPP-NBMob | Rel-8 |
| Building Block: Stage 2 for MESSIW | MESSIW | Rel-8 |
| Feature or Study Item: Study on Multimedia Session Continuity | FS_MMSC | Rel-8 |
| Feature or Study Item: Policy Enhancements for Sponsored Connectivity and Coherent Access to Policy related Databases | PEST | Rel-10 |
| Building Block: Stage 2 for Policy Enhancements for Sponsored Connectivity and Coherent Access to Policy related Databases | PEST | Rel-10 |
| Feature or Study Item: IMS Service Continuity Inter Device Transfer enhancements | IMS_SC_eIDT | Rel-10 |
| Feature or Study Item: Study on Single Radio Voice Call Continuity enhancements | FS_eSRVCC | Rel-10 |
| Feature or Study Item: Study on Bandwidth and resource savings in CS networks | BARS | Rel-6 |
| Feature or Study Item: Study on Interworking aspects and migration scenarios for IPv4 based IMS Implementations | IPv4IMS | Rel-6 |
| Feature or Study Item: 3GPP Enablers for services like Push to Talk over Cellular (PoC) | PoC | Rel-6 |
| Feature or Study Item: Subscriber certificates | SEC1-SC | Rel-6 |
| Feature or Study Item: Rel-6 Charging Management | CH | Rel-6 |
| Feature or Study Item: Service-Level Interworking for Messaging Services | MESSIW | Rel-8 |
| Feature or Study Item: Deleted - was Rel-7 - LCS for 3GPP Interworking WLAN | LCS4_IWLAN | Rel-8 |
| Building Block: Deleted - Architecture enhancements for non-3GPP accesses | SAES-non_3GPP | Rel-8 |
| Feature or Study Item: Deleted - never approved- FBI Phase 2 | FBI2 | Rel-8 |
| Building Block: Study on centralized IMS services control | FS_IMS_CSC | Rel-8 |
| Building Block: Deleted - Stage 2 of architecture for the 3GPP System Architecture Evolution | SAES-St2 | Rel-8 |
| Building Block: Deleted - TR on different possible architectures | SDoUE-FS | Rel-7 |
| Feature or Study Item: Voice Call Continuity between CS and IMS (incl. I-WLAN) | VCC | Rel-7 |
| Feature or Study Item: Enhancements to support QoS provisioning over 3GPP/WLAN Interworking | WLANQOS | Rel-7 |
| Building Block: Stage 2 for LCS3 (including IMS emergency location aspects) | LCS3 | Rel-7 |
| Building Block: Stage 2 on Session Continuity: covered by SAE | WLAN2 | Rel-7 |
| Feature or Study Item: Deleted - VoIMS bearer related enhancements | VoIMS | Rel-7 |
| Building Block: Stage 2 Specification Phase - IMS-level | EMC1 | Rel-7 |
| Building Block: Deleted - Stage 2 Specification Phase - GPRS-level | EMC1 | Rel-7 |
| Building Block: TR on ServID | ServID | Rel-7 |
| Building Block: Stage 1,2 of ServID | ServID | Rel-7 |
| Work task: Deleted - Study of work on an LCS architecture for I-WLAN. | LCS3-IWLAN-FSs2 | Rel-7 |
| Feature or Study Item: WLAN Interworking Private Network access from WLAN 3GPP IP Access | WLANPNA | Rel-7 |
| Building Block: WLAN-PNA - Stage 2 | WLANPNA-st2 | Rel-7 |
| Feature or Study Item: Deleted - Study on IMS enhancements and optimizations for real time communication. | IMS-RT | Rel-7 |
| Feature or Study Item: Deleted - PS domain and IMS support for IMS Emergency sessions | IMS-EMER | Rel-7 |
| Feature or Study Item: Supporting Globally Routable User Agent URIs in IMS | GRUU | Rel-7 |
| Feature or Study Item: Deleted - Study on Terminating Session handling | CSIterm | Rel-7 |
| Feature or Study Item: Access Class Barring and Overload Protection | ACBOP | Rel-7 |
| Building Block: TR on Stage 2 | ACBOP | Rel-7 |
| Feature or Study Item: Study on Enhancement of E2E QoS | QoS7 | Rel-7 |
| Feature or Study Item: System enhancements for Fixed Broadband access to IMS | FBI | Rel-7 |
| Feature or Study Item: Deleted - Study on Stage 2 (IMS services using CS bearers) | IRTSD-IMSCS | Rel-7 |
| Feature or Study Item: Location Services enhancements | LCS3 | Rel-7 |
| Building Block: Study on Stage 2 for GPRS-level solution | EMC1 | Rel-7 |
| Feature or Study Item: Support of SMS over generic 3GPP IP access | SMSIP | Rel-7 |
| Feature or Study Item: Evolution of Policy Control and Charging | PCC | Rel-7 |
| Building Block: Stage 2 for CSICS | CSICS | Rel-7 |
| Feature or Study Item: Study on Stage 2 aspects of IMS Service Brokering | FS_ISB_ST2 | Rel-8 |
| Building Block: System enhancements for interconnection interfaces between two IMSs | IMS_NNI | Rel-8 |
| Work task: Deleted (never approved) - Stage 2 of FBI for TISPAN R2 - Rel 8 | FBI2-TISP2-s2 | Rel-8 |
| Feature or Study Item: Study on IMS utilizing multicast bearer services | FS_MLTICAST-IMS | Rel-8 |
| Building Block: Stage 1 and 2 defined in earlier Releases | MIW-IMS | Rel-8 |
| 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: TR on Stage 2 for Data Identification in ANDSF | DIDA | Rel-11 |
| Building Block: Stage 2 for LOcation-Based Selection of gaTEways foR WLAN | LOBSTER | Rel-11 |
| Building Block: Stage 2 for Full Support of Multi-Operator Core Network by GERAN | Full_MOCN-GERAN | Rel-11 |
| Feature or Study Item: Deleted - Study on applicability of GALILEO for LCS | Galileo | Rel-7 |
| Feature or Study Item: Deleted - IMS Local services | IMSLocal | 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: WLAN-UMTS Interworking Phase 2 | WLAN2 | Rel-7 |
| Feature or Study Item: Combinational Services | CSICS | Rel-7 |
| Feature or Study Item: Study on 3GPP System Architecture Evolution | FS_SAE | Rel-8 |
| Building Block: Stage 2 Interim conclusion for RAN Work to start | FS_SAE | Rel-8 |
| Building Block: Stage 2 study on 3GPP architectural development | FS_SAE | Rel-8 |
| Building Block: End-to-end UMTS Quality of Service management | QoS | R99 |
| Feature or Study Item: Transcoder_location | Transcoder_location | R99 |
| Building Block: Virtual Home Environment | VHE | R99 |
| Feature or Study Item: CSI Terminating Session handling | CSItermS | Rel-7 |
| Building Block: One Tunnel Deployment Guideline | OPTUNEL-Guide | Rel-7 |
| Building Block: LCS support in the CS domain | LCS4-CS | Rel-4 |
| Building Block: LCS support in the PS domain | LCS4-PS | Rel-4 |
| Building Block: Speech Transcoder: Location and Control at the UMTS Core Network Border | TrFO-STLC | Rel-4 |
| Feature or Study Item: Global Text Telephony | GTT | Rel-4 |
| Feature or Study Item: Enable bearer independent CS architecture | CSSPLIT | Rel-4 |
| Feature or Study Item: Transcoder-Free Operation | TrFO | Rel-4 |
| Work task: Stage 2 for LCS architecture for I-WLAN | LCS3-IWLAN | Rel-7 |
| Building Block: SA1,SA2 part of Maintenance of TISPAN release 1 common IMS | IMS_Comm_Mtce7 | Rel-7 |
| Feature or Study Item: Maintenance of TISPAN release 1 common IMS | MCIMSTR1 | Rel-7 |
| Building Block: SA2 aspects of MCIMSTR1 | MCIMSTR1-S2 | Rel-7 |
| Feature or Study Item: UMTS QoS Architecture for PS Domain | QoSPS | Rel-4 |
| Feature or Study Item: Rel-4 Evolutions of the transport in the CN | CNTRSP | Rel-4 |
| Feature or Study Item: Rel-4 Location Services enhancements | LCS4 | 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: Interoperability and Commonality between IMS using different IP-connectivity Networks | IMSCOOP | Rel-6 |
| Feature or Study Item: Study on Service Continuity for Emergency Voice Calls | FS_VCCEm | Rel-9 |
| Feature or Study Item: Study on CS Domain Services over EPS access | FS_CSoPS | Rel-9 |
| Building Block: Deleted - Functions and procedures for SAE to support LTE MBMS | SAES_Ph2 | Rel-9 |
| Feature or Study Item: Study on Extended Support of IMS Emergency Calls | FS_IMS-eCall | Rel-9 |
| Building Block: LCS Control Plane Solution for EPS | LCS_EPS-CPS | Rel-9 |
| Feature or Study Item: MBMS support in EPS | MBMS_EPS | Rel-9 |
| Building Block: Stage 2 for MBMS support in EPS | MBMS_EPS | Rel-9 |
| Building Block: Customised Application for Mobile network Enhanced Logic Phase 3 | CAMEL3 | R99 |
| Building Block: Location Services | LCS | R99 |
| Building Block: End-to-end QoS for PS Domain including IMS | E2EQoS99 | R99 |
| Work task: General Packet Radio Service | GPRS | R99 |
| Feature or Study Item: Circuit Switched Video and Voice Service Improvements | CS_VSS | Rel-6 |
| Feature or Study Item: QoS Improvements | QoS1 | Rel-6 |
| Feature or Study Item: IMS Phase 2 | IMS2 | Rel-6 |
| Feature or Study Item: Location Services enhancements 2 | LCS2 | Rel-6 |
| Work task: Stage 2 GPRS for EPC (23.060, etc.) | SAES-SA-FP_3GPP | Rel-8 |
| Feature or Study Item: Mobility between 3GPP-WLAN Interworking and 3GPP Systems | IWLAN_Mob | Rel-8 |
| Building Block: Study on Enhancements to the Service-Based 5G System Architecture | FS_eSBA | Rel-16 |
| Building Block: Study on enhancement of URLLC supporting in 5GC | FS_5G_URLLC | Rel-16 |
| Building Block: Stopped - Study on enht of systems using EPS for UR and Availability using commodity equipment | FS_EPS_URACE | Rel-16 |
| Building Block: Study for single radio voice continuity from 5GS to 3G | FS_5G-SRVCC | Rel-16 |
| Building Block: Study on Enhancement of Network Slicing | FS_eNS | Rel-16 |
| Feature or Study Item: Stopped - Study on Application Awareness Interworking between LTE and NR | FS_AAI_LTE_NR | Rel-16 |
| Building Block: Study on RACS | FS_RACS | Rel-16 |
| Feature or Study Item: Stopped - Study on supporting Flexible Local Area Data Network | FS_FLADN | Rel-16 |
| Building Block: Study on 5GS Enhanced support of Vertical and LAN Services | FS_Vertical_LAN | Rel-16 |
| Feature or Study Item: Stopped - Study on system architecture for next generation real time communication services | FS_NG_RTC | Rel-16 |
| Building Block: Stage 2 of xBDT | xBDT | Rel-16 |
| Feature or Study Item: 5GS Enhanced support of Vertical and LAN Services | Vertical_LAN | Rel-16 |
| Building Block: Stage 2 of RACS | RACS | Rel-16 |
| Building Block: Stage 2 of eIMS5G_SBA | eIMS5G_SBA | Rel-16 |
| Building Block: Stage 2 of UDICOM | UDICOM | Rel-16 |
| Building Block: Stage 2 of EWE | EWE | Rel-14 |
| Building Block: Study on Service Domain Centralization | FS_SeDoC | Rel-14 |
| Building Block: Study on sponsored data connectivity improvements | FS_SDCI | Rel-14 |
| Feature or Study Item: Study on Enhancements to eMBMS for TV Video Service | FS_AE_enTV | Rel-14 |
| Building Block: Study on group based enhancements in the network capability exposure functions | FS_GENCEF | Rel-14 |
| Building Block: Study on Robust Call Setup for VoLTE subscriber in LTE | FS_RobVoLTE | Rel-14 |
| Work task: Study on Stage 2 of LTE support for V2X services | FS_V2XARC | Rel-14 |
| Feature or Study Item: SA2 aspects on Study on Architecture and Security for next Generation System | FS_NextGen | Rel-14 |
| Building Block: Stage 2 of Evolution to and Interworking with eCall in IMS | EIEI | Rel-14 |
| Building Block: Study on Phase 2 of the Support of Emergency services over WLAN | FS_SEW2 | Rel-14 |
| Building Block: Study on improvement of awareness of user location change | FS_AULC | Rel-14 |
| Building Block: Study on Enhancements of Dedicated Core Networks selection mechanism | FS_eDecor | Rel-14 |
| Building Block: Study on Control and User Plane Separation of EPC nodes | FS_CUPS | Rel-14 |
| Building Block: Study on S8 Home Routing Architecture | FS_V8 | Rel-14 |
| Building Block: Study on Complementary Features for Voice services over WLAN | FS_VoWLAN | Rel-15 |
| Feature or Study Item: Study on Enhanced Isolated E-UTRAN Operation for Public Safety | FS_IOPS_LB | Rel-15 |
| Building Block: Stage 2 of eVoLP | eVoLP | Rel-15 |
| Building Block: Stage 2 of INOBEAR | INOBEAR | Rel-15 |
| Building Block: Stage 2 of USOS | USOS | Rel-15 |
| Feature or Study Item: EPC support for E-UTRAN Ultra Reliable Low Latency Communication | EPS_URLLC | Rel-15 |
| Work task: S2 aspects of FS_eVoLP | FS_eVoLP | Rel-15 |
| Building Block: Study on architecture enhancements to ProSe UE-to-Network Relay | FS_REAR | Rel-15 |
| Building Block: Study on unlicensed spectrum offloading system enhancements | FS_USOS | Rel-15 |
| Building Block: Stopped - Study on Stage 2 of LTE_LIGHT_CON | FS_LTE_LIGHT_CON | Rel-15 |
| Building Block: Stage 2 of PS Data Off Phase 2 | PS_DATA_OFF2 | Rel-15 |
| Building Block: Stage 2 of NAPS | NAPS | Rel-15 |
| Building Block: Stage 2 of ProSe_WLAN_DD | ProSe_WLAN_DD_Stage2 | Rel-15 |
| Building Block: SA2 aspects of EDCE5 | EDCE5 | Rel-15 |
| Building Block: Stage 2 of VoWLAN | VoWLAN | Rel-15 |
| Building Block: Stage 2 of 5G System - Phase 1 | 5GS_Ph1 | Rel-15 |
| Building Block: Study on eV2XARC | FS_eV2XARC | Rel-16 |
| Feature or Study Item: Study on the Wireless and Wireline Convergence for the 5G system architecture | FS_5WWC | Rel-16 |
| Feature or Study Item: Stopped - Study on encrypted traffic detection | FS_ENTRADE | Rel-16 |
| Building Block: Study on Stage 2 for PARLOS | FS_PARLOS_SA2 | Rel-16 |
| Building Block: Study of enablers for Network Automation for 5G | FS_eNA | Rel-16 |
| Building Block: Study on 5G_CIoT | FS_CIoT_5G | Rel-16 |
| Building Block: Study on ETSUN | FS_ETSUN | Rel-16 |
| Building Block: Study on ATSSS | FS_ATSSS | Rel-16 |
| Building Block: Study on Enhancement to the 5GC Location Services | FS_eLCS | Rel-16 |
| Feature or Study Item: Study on Enhanced IMS to 5GC Integration | FS_eIMS5G | Rel-16 |
| Building Block: Stopped - Study on EPC support for Mobility with Low Latency Communication | FS_LLC_Mob | Rel-16 |
| Building Block: Study on UDICOM | FS_UDICoM | Rel-16 |
| Building Block: Stage 2 of ETSUN | ETSUN | Rel-16 |
| Building Block: Stage 2 of 5WWC | 5WWC | Rel-16 |
| Building Block: Stage 2 of 5G_CIoT | 5G_CIoT | Rel-16 |
| Building Block: Stage 2 of 5G_eLCS | 5G_eLCS | Rel-16 |
| Building Block: Stage 2 of Vertical_LAN | Vertical_LAN | Rel-16 |
| Building Block: Stage 2 of eV2XARC | eV2XARC | Rel-16 |
| Building Block: Stage 2 of 5G_URLLC | 5G_URLLC | Rel-16 |
| Building Block: Stage 2 of eNA | eNA | Rel-16 |
| Building Block: Stage 2 of ATSSS | ATSSS | Rel-16 |
| Building Block: Stage 2 of 5G_eSBA | 5G_eSBA | Rel-16 |
| Building Block: Stage 2 of eNS | eNS | Rel-16 |
| Building Block: Single radio voice continuity from 5GS to 3G | 5G_SRVCC | Rel-16 |
| Building Block: Stage 2 of PARLOS | PARLOS | Rel-16 |
| Feature or Study Item: S6b Optional for ePDG connected to 5GS | 5GS_S6b_Optional | Rel-16 |
| Feature or Study Item: User data interworking, Coexistence and Migration | UDICOM | Rel-16 |
| Building Block: Architecture enhancements for the support of Integrated access and backhaul (IAB) | IABARC | Rel-16 |
| Work task: Stage 2 of IABARC | IABARC | Rel-16 |
| Building Block: Study on Enhancement of Network Slicing Phase 2 | FS_eNS_Ph2 | Rel-17 |
| Building Block: Stopped - Study on MPS2, Stage 2 | FS_MPS2_St2 | Rel-17 |
| Feature or Study Item: Study on enhanced support of Industrial IoT | FS_IIoT | Rel-17 |
| Building Block: Study on V2X services Phase 2 | FS_eV2XARC_Ph2 | Rel-17 |
| Building Block: Study on ATSSS_Ph2 | FS_ATSSS_Ph2 | Rel-17 |
| Feature or Study Item: 5G System Enhancement for Advanced Interactive Services | 5G_AIS | Rel-17 |
| Feature or Study Item: Stopped - Study on the Usage of User Identifiers in the 5G System | FS_UUI5 | Rel-17 |
| Building Block: Study on Enablers for Network Automation for 5G - phase 2 | FS_eNA_Ph2 | Rel-17 |
| Feature or Study Item: Study on Enhancement to the 5GC LoCation Services-Phase 2 | FS_eLCS_ph2 | Rel-17 |
| Feature or Study Item: Study on enhanced support of Non-Public Networks | FS_eNPN | Rel-17 |
| Feature or Study Item: Stopped - Study on enhancement of support for 5G LAN-type service | FS_5GLAN_enh | Rel-17 |
| Work task: Stage 2 for TEI17_SPSFAS | TEI17_SPSFAS | Rel-17 |
| Work task: Stage 2 for TEI17_SE_RPS | TEI17_SE_RPS | Rel-17 |
| Building Block: IMS Optimization for HSS Group ID in an SBA environment | TEI17_IMSGID | Rel-17 |
| Building Block: N7/N40 Interfaces Enhancements to Support GERAN and UTRAN | TEI17_NIESGU | Rel-17 |
| Building Block: Support of different slices over different Non 3GPP access | TEI17_N3SLICE | Rel-17 |
| Building Block: Dynamic management of group-based event monitoring | TEI17_GroupEventMont | Rel-17 |
| Building Block: IP address pool information from UDM | TEI17_IPU | Rel-17 |
| Building Block: Dynamically Changing AM Policies in the 5GC | TEI17_DCAMP | Rel-17 |
| Building Block: Support for Signed Attestation for Priority and Emergency Sessions | TEI17_SAPES | Rel-17 |
| Building Block: Stage 2 of 5G_eLCS_ph2 | 5G_eLCS_ph2 | Rel-17 |
| Building Block: Stage 2 of MPS2 | MPS2 | Rel-17 |
| Work task: Stage 2 for TEI17_IMSGID | TEI17_IMSGID | Rel-17 |
| Work task: Stage 2 for TEI17_SAPES | TEI17_SAPES | Rel-17 |
| Work task: Stage 2 for TEI17_DCAMP | TEI17_DCAMP | Rel-17 |
| Building Block: IP address pool information from UDM | TEI17_IPU | Rel-17 |
| Work task: Stage 2 for TEI17_GEM | TEI17_GEM | Rel-17 |
| Work task: Stage 2 for TEI17_N3SLICE | TEI17_N3SLICE | Rel-17 |
| Work task: Stage 2 for TEI17_NIESGU | TEI17_NIESGU | Rel-17 |
| Building Block: (Stage 2 of) Integration of satellite components in the 5G architecture | 5GSAT_ARCH | Rel-17 |
| Feature or Study Item: Stopped - Supporting Flexible Local Area Data Network | FLADN | Rel-17 |
| Building Block: Stage 2 of RDSSI | RDSSI | Rel-17 |
| Building Block: Study on Architectural enhancements for 5MBS | FS_5MBS | Rel-17 |
| Feature or Study Item: Stopped - Study on service-based support for SMS in 5GC | FS_SB_SMS | Rel-17 |
| Feature or Study Item: Study on enhancement of support for Edge Computing in 5GC | FS_enh_EC | Rel-17 |
| Building Block: Study on System enhancement for Proximity based Services in 5GS | FS_5G_ProSe | Rel-17 |
| Feature or Study Item: Stopped - Study on UPF enhancement for control and SBA | FS_UPCAS | Rel-17 |
| Feature or Study Item: Study on supporting Uncrewed Aerial Systems Connectivity, Identification, and Tracking | FS_ID_UAS_SA2 | Rel-17 |
| Building Block: Study on Stage 2 (System Enablers) for MUSIM | FS_MUSIM | Rel-17 |
| Building Block: Architecture Enhancement for NR Reduced Capability Devices | ARCH_NR_REDCAP | Rel-17 |
| Building Block: Architecture support for NB-IoT/eMTC Non-Terrestrial Networks in EPS | IoT_SAT_ARCH_EPS | Rel-17 |
| Building Block: IMS Optimization for HSS Group ID in an SBA environment (St. 2) | TEI17_IMSGID | Rel-17 |
| Building Block: Stage 2 of MINT | MINT | Rel-17 |
| Building Block: Stage 2 of eV2XARC_Ph2 | eV2XARC_Ph2 | Rel-17 |
| Building Block: Stage 2 for Proximity based Services in 5GS | 5G_ProSe | Rel-17 |
| Building Block: Stage 2 for IIoT | IIoT | Rel-17 |
| Building Block: Stage 2 for 5MBS | 5MBS | Rel-17 |
| Building Block: Stage 2 of eNA_Ph2 | eNA_Ph2 | Rel-17 |
| Building Block: Stage 2 for Enhancement of Network Slicing Phase 2 | eNS_Ph2 | Rel-17 |
| Building Block: Stage 2 of ATSSS_Ph2 | ATSSS_Ph2 | Rel-17 |
| Building Block: System enablers for Multi-USIM devices | MUSIM | Rel-17 |
| Building Block: (Stage 2 of) Support of Uncrewed Aerial Systems Connectivity, Identification, and Tracking | ID_UAS | Rel-17 |
| Building Block: Stage 2 for eNPN | eNPN | Rel-17 |
| Building Block: Stage 2 of eEDGE_5GC | eEDGE_5GC | Rel-17 |
| Building Block: Study on architecture aspects for using satellite access in 5G | FS_5GSAT_ARCH | Rel-17 |
| Building Block: Study on Phase 2 of UAS, UAV and UAM | FS_UAS_Ph2 | Rel-18 |
| Building Block: Study on System Enabler for Service Function Chaining | FS_SFC | Rel-18 |
| Building Block: Stage 2 of MPS_WLAN | MPS_WLAN | Rel-18 |
| Feature or Study Item: Study on Extensions to the TSC Framework to support Deterministic Networking (DetNet) | FS_DetNet | Rel-18 |
| Building Block: Study on 5G Timing Resiliency and TSC&URLLC enhancements | FS_5TRS_URLLC | Rel-18 |
| Feature or Study Item: Study on RedCap Phase 2 | FS_REDCAP_Ph2 | Rel-18 |
| Building Block: Study on Architecture Enhancements for Vehicle Mounted Relays | FS_VMR | Rel-18 |
| Building Block: Study on Enhancement to the 5GC LoCation Services-Phase 3 | FS_eLCS_Ph3 | Rel-18 |
| Building Block: Study on Stage 2 of Edge Computing phase 2 | FS_EDGE_Ph2 | Rel-18 |
| Building Block: Study on Support of Satellite Backhauling in 5GS | FS_5GSATB | Rel-18 |
| Building Block: Study on generic group management, exposure and communication enhancements | FS_GMEC | Rel-18 |
| Feature or Study Item: Study on the support for 5WWC, Phase 3 | FS_5WWC_Ph3 | Rel-18 |
| Building Block: Study on Enhancement of Network Slicing Phase 3 | FS_eNS_Ph3 | Rel-18 |
| Building Block: Study on 5G AM Policy | FS_AMP | Rel-18 |
| Building Block: Study on Personal IoT Networks | FS_PIN | Rel-18 |
| Building Block: Study on system architecture for next generation real time communication services | FS_NG_RTC | Rel-18 |
| Building Block: Study on architectural enhancements for 5G multicast-broadcast services Phase 2 | FS_5MBS_Ph2 | Rel-18 |
| Building Block: Study on architecture enhancement for XR and media services | FS_XRM | Rel-18 |
| Building Block: Study on Ranging based services and sidelink positioning | FS_Ranging_SL | Rel-18 |
| Building Block: Study on Access Traffic Steering, Switching and Splitting support in the 5G system architecture; Phase 3 | FS_ATSSS_Ph3 | Rel-18 |
| Building Block: Study on 5G System Support for AI/ML-based Services | FS_AIMLsys | Rel-18 |
| Feature or Study Item: Study on enhancement of 5G UE Policy | FS_eUEPO_Ph2 | Rel-18 |
| Building Block: Study on Enablers for Network Automation for 5G - phase 3 | FS_eNA_Ph3 | Rel-18 |
| Feature or Study Item: Study on 5GC enhancement for satellite access Phase 2 | FS_5GSAT_Ph2 | Rel-18 |
| Building Block: Study on enhanced support of Non-Public Networks phase 2 | FS_eNPN_Ph2 | Rel-18 |
| Feature or Study Item: Study on UPF enhancement for Exposure And SBA | FS_UPEAS | Rel-18 |
| Building Block: Study on Stage 2 for Proximity based Services Phase 2 | FS_5G_ProSe_Ph2 | Rel-18 |
| Feature or Study Item: Study on Seamless UE context recovery | FS_SUECR | Rel-18 |
| Feature or Study Item: Study on Proximity based Services Phase 2 | FS_5G_ProSe_Ph2 | Rel-18 |
| Building Block: Study on Edge Computing phase 2 | FS_EDGE_Ph2 | Rel-18 |
| Feature or Study Item: Study on enhancement of 5G UE Policy | FS_eUEPO | Rel-18 |
| Building Block: Study on the support for 5WWC Phase 2 | FS_5WWC_Ph2 | Rel-18 |
| Building Block: (Stage 2 of) MBS support for V2X services | TEI18_MBS4V2X | Rel-18 |
| Building Block: Stage 2 of TEI18_SLAMUP | TEI18_SLAMUP | Rel-18 |
| Building Block: Stage 2 of TEI18_MLR | TEI18_MLR | Rel-18 |
| Building Block: Stage 2 of TEI18_ADEE | TEI18_ADEE | Rel-18 |
| Building Block: Stage 2 of TEI18_IPv6PD | TEI18_IPv6PD | Rel-18 |
| Building Block: Stage 2 of Secondary DN Authentication and authorization in EPC IWK cases | TEI18_SDNAEPC | Rel-18 |
| Building Block: Stage 2 of TEI18_DCAMP_Ph2 | TEI18_DCAMP_Ph2 | Rel-18 |
| Building Block: Stage 2 of 5WWC_Ph2 | 5WWC_Ph2 | Rel-18 |
| Building Block: Stage 2 of Extensions to the TSC Framework to support DetNet | DetNet | Rel-18 |
| Building Block: Stage 2 of 5G System Enabler for Service Function Chaining | SFC | Rel-18 |
| Building Block: (Stage 2 of) NR RedCap UE with long eDRX for RRC_INACTIVE State | NR_REDCAP_Ph2 | Rel-18 |
| Building Block: System architecture for Next Generation Real time Communication services | NG_RTC | Rel-18 |
| Building Block: Stage 2 of Non-Public Networks Phase 2 | eNPN_Ph2 | Rel-18 |
| Building Block: (stage 2 of) Proximity-based Services in 5GS Phase 2 | 5G_ProSe_Ph2 | Rel-18 |
| Building Block: Stage 2 of 5G AM Policy | AMP | Rel-18 |
| Building Block: Stage 2 of 5GSATB | 5GSATB | Rel-18 |
| Building Block: Stage 2 of UPEAS | UPEAS | Rel-18 |
| Building Block: Stage 2 of Seamless UE context recovery | SUECR | Rel-18 |
| Building Block: (stage 2 of) 5GC LoCation Services - Phase 3 | 5G_eLCS_Ph3 | Rel-18 |
| Building Block: Stage 2 of Network Slicing Phase 3 | eNS_Ph3 | Rel-18 |
| Building Block: Stage 2 of ATSSS_Ph3 | ATSSS_Ph3 | Rel-18 |
| Building Block: Stage 2 of Timing Resiliency and URLLC enhancements | TRS_URLLC | Rel-18 |
| Building Block: (Stage 2 of) Enhancement of 5G UE Policy | eUEPO | Rel-18 |
| Building Block: (stage 2 of) Edge Computing Phase 2 | EDGE_Ph2 | Rel-18 |
| Building Block: Stage 2 of eNSAC | eNSAC | Rel-18 |
| Building Block: Stage 2 of GMEC | GMEC | Rel-18 |
| Building Block: (Stage 2 of) Personal IoT Networks | PIN | Rel-18 |
| Building Block: (Stage 2 of UAS Ph2) Further Architecture Enhancement for UAV and UAM | UAS_Ph2 | Rel-18 |
| Building Block: (Stage 2 of 5MBS_Ph2) Architectural enhancements for 5G multicast-broadcast services Phase 2 | 5MBS_Ph2 | Rel-18 |
| Building Block: (Stage 2 of 5GSAT_Ph2) 5GC/EPC enhancement for satellite access Phase 2 | 5GSAT_Ph2 | Rel-18 |
| Building Block: Stage 2 of Ranging_SL | Ranging_SL | Rel-18 |
| Building Block: (Stage 2 for XRM) Architecture Enhancements for XR (Extended Reality) and media service | XRM | Rel-18 |
| Building Block: Stage 2 of Network Slicing Phase 3 | eNS_Ph3 | Rel-18 |
| Building Block: (Stage 2 for VMR) Architecture Enhancements for Vehicle Mounted Relays | VMR | Rel-18 |
| Building Block: (Stage 2 for AIML) System Support for AI/ML-based Services | AIMLsys | Rel-18 |
| Building Block: (stage 2 of eNA_Ph3) Enablers for Network Automation for 5G phase 3 | eNA_Ph3 | Rel-18 |
| Building Block: Study on Energy Efficiency and Energy Saving | FS_EnergySys | Rel-19 |
| Building Block: Study on system architecture for next generation real time communication services phase 2 | FS_NG_RTC_Ph2 | Rel-19 |
| Building Block: Study on MPS for IMS Messaging and SMS services | FS_MPS4msg | Rel-19 |
| Building Block: Study on Extended Reality and Media service (XRM) Phase 2 | FS_XRM_Ph2 | Rel-19 |
| Building Block: Study on Integration of satellite components in the 5G architecture Phase 3 | FS_5GSAT_Ph3_ARCH | Rel-19 |
| Building Block: Stage 2 of On-demand broadcast of GNSS assistance data | TEI19_OBGAD | Rel-19 |
| Building Block: (Stage 2 of) Indirect Network Sharing | TEI19_NetShare | Rel-19 |
| Building Block: Architecture support of roaming value-added services | TEI19_RVAS | Rel-19 |
| Building Block: Stage 2 of Spending Limits for UE Policies in Roaming scenario | TEI19_SLUPiR | Rel-19 |
| Building Block: Stage 2 of ProSe support in NPN | TEI19_ProSe_NPN | Rel-19 |
| Feature or Study Item: Multiple Location Procedure for Emergency LCS Routing | TEI19_MLR4RTR | Rel-19 |
| Feature or Study Item: Roaming traffic offloading via session breakout in HPLMN | TEI19_HSBO | Rel-19 |
| Building Block: Deferred 5GC-MT-LR Procedure for Periodic Location Events based NRPPa Periodic Measurement Reports | TEI19_DLPMR | Rel-19 |
| Building Block: Stage 2 of QoS monitoring enhancement | TEI19_QME | Rel-19 |
| Building Block: Stage 2 of Subscription control for reference time distribution in EPS | TEI19_TIME_SUB_EPS | Rel-19 |
| Building Block: Stage 2 of NF discovery and selection by target PLMN | TEI19_NFsel_by_tPLMN | Rel-19 |
| Building Block: Study on User Identities and Authentication Architecture | FS_UIA_ARC | Rel-19 |
| Building Block: Study on Proximity-based Services in 5GS Phase 3 | FS_5G_ProSe_Ph3 | Rel-19 |
| Building Block: Study on Vehicle Mounted Relays Phase 2 | FS_VMR_Ph2 | Rel-19 |
| Feature or Study Item: Study on Core Network Enhanced Support for Artificial Intelligence (AI)/Machine Learning (ML) | FS_AIML_CN | Rel-19 |
| Building Block: Study on (Stage 2 of) Phase 3 for UAS, UAV and UAM | FS_UAS_Ph3 | Rel-19 |
| Building Block: Study on Multi-Access (DualSteer and ATSSS_Ph4) | FS_MASSS | Rel-19 |
| Building Block: Study on Architecture support of Ambient power-enabled Internet of Things | FS_AmbientIoT | Rel-19 |
| Building Block: Study on System aspects of 5G NR Femto | FS_5G_Femto | Rel-19 |
| Building Block: Study on UPF enhancement for Exposure And SBA Phase 2 | FS_UPEAS_Ph2 | Rel-19 |
| Building Block: Study on Enhancement of support for Edge Computing in 5G Core network - Phase 3 | FS_eEDGE_5GC_Ph3 | Rel-19 |
| Building Block: Energy Efficiency and Energy Saving | EnergySys | Rel-19 |
| Feature or Study Item: ATSSS Rule Provisioning via 3GPP access connected to EPC | TEI19_ARP3E | Rel-19 |
| Building Block: Stage 2 of Minimize the Number of Policy Associations | TEI19_MINPA | Rel-19 |
| Building Block: Stage 2 of Enhancing Parameter Provisioning with static UE IP address and UP security policy | TEI19_IP_SP_EXP | Rel-19 |
| Building Block: Stage 2 of Providing per-subscriber VLAN instructions from UDM and DN-AAA | TEI19_VLANSUB | Rel-19 |
| Building Block: Stage 2 of Identifying non-3GPP Devices Connecting behind a UE or 5G-RG | UIA_ARC | Rel-19 |
| Building Block: Stage 2 of System architecture for Next Generation Real time Communication services Phase 2 | NG_RTC_Ph2 | Rel-19 |
| Building Block: Integration of satellite components in the 5G architecture Phase 3 | 5GSAT_Ph3-ARC | Rel-19 |
| Building Block: System aspects of 5G NR Femto | 5G_Femto | Rel-19 |
| Building Block: (stage 2 of) MPS for IMS Messaging and SMS services | MPS4msg | Rel-19 |
| Building Block: Proximity-based Services in 5GS Phase 3 | 5G_ProSe_Ph3 | Rel-19 |
| Building Block: Stage 2 of Vehicle Mounted Relays Phase 2 | VMR_Ph2 | Rel-19 |
| Building Block: Extended Reality and Media service (XRM) Phase 2 | XRM_Ph2 | Rel-19 |
| Building Block: Stage 2 of Core Network Enhanced Support for Artificial Intelligence (AI)/Machine Learning (ML) | AIML_CN | Rel-19 |
| Building Block: Stage 2 of Multi-Access (ATSSS_Ph4) | MASSS | Rel-19 |
| Building Block: Stage 2 of UPF enhancement for Exposure And SBA Phase 2 | UPEAS_Ph2 | Rel-19 |
| Building Block: (Stage 2 of) UAS, UAV and UAM Phase 3 | UAS_Ph3 | Rel-19 |
| Building Block: Stage 2 of Enhancement of support for Edge Computing in 5G Core network - Phase 3 | eEDGE_5GC_Ph3 | Rel-19 |
| Feature or Study Item: UPF enhancement for Exposure And SBA Phase 2 | UPEAS_Ph2 | Rel-19 |
| Building Block: Architecture support of Ambient power-enabled Internet of Things | AmbientIoT-ARC | Rel-19 |
| Building Block: Stage 2 of MSISDN verification operation support to Nnef_UEId Service | TEI19_MVOSNS | Rel-19 |
| Building Block: Stage 2 of ATSSS Rule Provisioning via 3GPP access connected to EPC | TEI19_ARP3E | Rel-19 |
| Building Block: Stage 2 of Network Controlled Network Slice Selection | TEI19_SliceSel | Rel-19 |
| Building Block: Stage 2 of PRU Usage Extension supported by Core Network | TEI19_PRUE | Rel-19 |
| Feature or Study Item: Study on Integration of satellite components in the 5G architecture Phase 4 | FS_5GSAT_Ph4_ARC | Rel-20 |
| Feature or Study Item: Study on Stage 2 for Integrated Sensing and Communication | FS_Sensing_ARC | Rel-20 |
| Feature or Study Item: Study on Core Network Enhanced Support for AIML Phase 2 | FS_AIML_CN_Ph2 | Rel-20 |
| Feature or Study Item: Study on Architecture for 6G System | FS_6G_ARC | Rel-20 |
| Feature or Study Item: 5G ProSe Phase 4 | ProSe_Ph4-ARC | Rel-20 |
| Building Block: Stage 2 for Indirect Network Sharing Phase2 | NetShare_Ph2-ARC | Rel-20 |
| Feature or Study Item: Study on system architecture for Phae 3 of NG RTC | FS_NG_RTC_Ph3_ARC | Rel-20 |
| Feature or Study Item: MPS Enhancements for IoT | MPS_IOT-ARC | Rel-20 |
| Building Block: Study on Short Message Service to Emergency Response Centre | FS_SMS2EC_ARC | Rel-20 |
| Feature or Study Item: Study on Architecture support of AmbientIoT - Phase 2 | FS_AmbientIoT_Ph2_ARC | Rel-20 |
| Feature or Study Item: Study on Energy Efficiency and Energy Saving Phase2 | FS_EnergySys_Ph2 | Rel-20 |
