Note that this page shows only those active (i.e. not yet completed) WIs where s2 is the sole responsible group.
There may be other active WIs for which this group holds joint responsibility, particularly hierachically higher WIs which comprise WIs from several groups: such WIs are not shown on this page.
| 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 |
| 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 |
| 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: 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 |
| 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: Stage 2 of PS Data Off | PS_DATA_OFF | Rel-14 |
| 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: 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: 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: 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 |
| 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: Robust Call Setup for VoLTE subscriber in LTE | RobVoLTE | Rel-14 |
| 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 architecture enhancements for Public Safety | FS_IOPS_St2 | Rel-13 |
| 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 |
| Building Block: Optimizations to Support High Latency Communications | HLcom | 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 |
| 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 |
| Building Block: Service Domain Centralization | SeDoC | Rel-14 |
| 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 |
| Feature or Study Item: Dual connectivity for LTE | LTE_SC_enh_dualC | Rel-12 |
| Feature or Study Item: Deleted - IMS Registration Control | IMS_RegCon | Rel-12 |
| Feature or Study Item: WLAN/3GPP Radio Interworking | UTRA_LTE_WLAN_interw | Rel-12 |
| 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 |
| Building Block: Stage 2 for Core Network Overload - User Location Information reporting improvement | CNO_ULI-SA2 | Rel-12 |
| 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 |
| 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: SA2 aspects of WLAN/3GPP Radio Interworking | UTRA_LTE_WLAN_interw-SA2 | Rel-12 |
| 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: 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 |
| Building Block: Stage 2 for Roaming Architecture for Voice over IMS with Local Breakout | RAVEL | Rel-11 |
| 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 |
| 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: 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 |
| Work task: MTC related interfaces and functional entities to support above features (MTCsp, etc.) | SIMTC-Reach | Rel-11 |
| 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 |
| 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: 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: 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 |
| 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: 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 |
| 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: 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: S2b Mobility based on GTP | SMOG | Rel-10 |
| Building Block: Stage 2 for Data Identification in ANDSF | DIDA | Rel-11 |
| 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 |
| 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 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 |
| 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 |
| 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 |
| Building Block: SA2 part of Dual connectivity for LTE | LTE_SC_enh_dualC-S2 | Rel-12 |
| 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 |
| 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 |
| 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: 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 |
| 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 |
| 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 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 |
| Feature or Study Item: CSI Terminating Session handling | CSItermS | Rel-7 |
| Building Block: One Tunnel Deployment Guideline | OPTUNEL-Guide | Rel-7 |
| 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 |
| 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 |
| 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 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 |
| 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 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: 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 |
| 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: 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: 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 |
| 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 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 |
| 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: 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 |
| 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 |
| Feature or Study Item: 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 |
| Feature or Study Item: Minimize the Number of Policy Associations | TEI19_MINPA | 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 |
| Feature or Study Item: Enhancing Parameter Provisioning with static UE IP address and UP security policy | TEI19_IP_SP_EXP | 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 |
| Feature or Study Item: 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 |
| Feature or Study Item: Subscription control for reference time distribution in EPS | TEI19_TIME_SUB_EPS | Rel-19 |
| Feature or Study Item: Providing per-subscriber VLAN instructions from UDM and DN-AAA | TEI19_VLANSUB | 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 |
| Feature or Study Item: 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: 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 |
| Feature or Study Item: Core Network Enhanced Support for Artificial Intelligence (AI)/Machine Learning (ML) | AIML_CN | 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: Multi-Access (ATSSS_Ph4) | MASSS | Rel-19 |
| Feature or Study Item: System architecture for Next Generation Real time Communication services Phase 2 | NG_RTC_Ph2 | Rel-19 |
| Feature or Study Item: NF discovery and selection by target PLMN | TEI19_NFsel_by_tPLMN | Rel-19 |
| Feature or Study Item: On-demand broadcast of GNSS assistance data | TEI19_OBGAD | Rel-19 |
| Feature or Study Item: ProSe support in NPN | TEI19_ProSe_NPN | Rel-19 |
| Feature or Study Item: QoS monitoring enhancement | TEI19_QME | Rel-19 |
| Feature or Study Item: Spending Limits for UE Policies in Roaming scenario | TEI19_SLUPiR | Rel-19 |
| Feature or Study Item: Identifying non-3GPP Devices Connecting behind a UE or 5G-RG | UIA_ARC | Rel-19 |
| Feature or Study Item: UPF enhancement for Exposure And SBA Phase 2 | UPEAS_Ph2 | Rel-19 |
| Feature or Study Item: Vehicle Mounted Relays Phase 2 | VMR_Ph2 | Rel-19 |
| Building Block: (WA) Energy Efficiency and Energy Saving | EnergySys | 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 III | 5GSAT_Ph3-ARC | Rel-19 |
| Feature or Study Item: 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 |
| Feature or Study Item: 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 |
| Feature or Study Item: Enhancement of support for Edge Computing in 5G Core network - Phase 3 | eEDGE_5GC_Ph3 | Rel-19 |
| Building Block: (Stage 2 of) UAS, UAV and UAM Phase 3 | UAS_Ph3 | Rel-19 |
