| Feature or Study Item: (Small) Technical Enhancements and Improvements for Rel-4 | TEI4 | Rel-4 |
| Feature or Study Item: GERAN improvements 4 (Delayed TBF) | GEIMP4 | Rel-4 |
| Building Block: Gb enhancements 2 | GEIMP4-Gben2 | Rel-4 |
| Feature or Study Item: 700 MHz spectrum support | 700SS | Rel-4 |
| Feature or Study Item: GERAN improvements 1 (Gb over IP) | GEIMP1 | Rel-4 |
| Feature or Study Item: Uplink TDOA feasibility study | TDOAF | Rel-6 |
| Feature or Study Item: Enhanced A/Gb feasibility study | AGbEnFS | Rel-6 |
| Feature or Study Item: Flexible Layer One for GERAN | FLOGER | Rel-6 |
| Building Block: Realisation of a Flexible Layer One | FLOGER-Real | Rel-6 |
| Building Block: Support of MBMS in GERAN | MBMS-GERAN | Rel-6 |
| Feature or Study Item: Downlink Advanced Receiver Performance | DARP | Rel-6 |
| Building Block: DARP test scenarios | DARP-TS | Rel-6 |
| Building Block: DARP for GMSK modulated voice services | DARP-GMSK | Rel-6 |
| Work task: Performance requirements in 45.005 for DARP for GMSK modulated voice services | DARP-GMSK-Perf | Rel-6 |
| Work task: Radio subsystem link control in 45.008 for DARP for GMSK modulated voice services | DARP-GMSK-LC | Rel-6 |
| Building Block: DARP for GPRS and EGPRS MCS1-MCS4 | DARP-GPRSE | Rel-6 |
| Work task: Performance requirements in 45.005 for DARP for GPRS and EGPRS MCS1-MCS4 | DARP-GPRSE-Perf | Rel-6 |
| Work task: Radio subsystem link control in 45.008 for DARP for GPRS and EGPRS MCS1-MCS4 | DARP-GPRSE-LC | Rel-6 |
| Building Block: DARP Capability signalling | DARP-CAPSIG | Rel-6 |
| Building Block: LCS Enhancements related to Location-Based Services | LCS3-LBS | Rel-7 |
| Building Block: Minimise the transfer delay between the SGSN and the MS | SCSAGB-MTD | Rel-7 |
| Building Block: Towards AGNSS Concept | AGNSS-GP | Rel-7 |
| Feature or Study Item: Deleted - Study on enhanced support of Video Telephony | VIDGER | Rel-7 |
| Feature or Study Item: Higher Uplink performance for GERAN Evolution | HUGE | Rel-7 |
| Feature or Study Item: Support of Conversational Services in A/Gb mode via the PS domain | SCSAGB | Rel-7 |
| Feature or Study Item: (Small) Technical Enhancements and Improvements for Rel-8 | TEI8 | Rel-8 |
| Feature or Study Item: GERAN support for GERAN - 3G Long Term Evolution interworking | GELTE | Rel-8 |
| Feature or Study Item: GAN Enhancements | GANENH | Rel-8 |
| Building Block: Update to GAN specifications | GANENH-SPEC | Rel-8 |
| Feature or Study Item: Study on A-interface over IP | AINTIP | Rel-8 |
| Feature or Study Item: Study on Multi-User Reusing-One-Slot | MUROS | Rel-8 |
| Feature or Study Item: AoIP (A-interface over IP) | AoIP | Rel-8 |
| Feature or Study Item: Enhanced Home NodeB / eNodeB | EHNB | Rel-9 |
| Feature or Study Item: Hybrid Location | HILT | Rel-9 |
| Feature or Study Item: (Small) Technical Enhancements and Improvements for Rel-9 | TEI9 | Rel-9 |
| Feature or Study Item: (Small) Technical Enhancements and Improvements for Rel-10 | TEI10 | Rel-10 |
| Feature or Study Item: Local Call Local Switch | LCLS | Rel-10 |
| Feature or Study Item: (Small) Technical Enhancements and Improvements for Rel-12 | TEI12 | Rel-12 |
| Feature or Study Item: (Small) Technical Enhancements and Improvements for Rel-5 | TEI5 | Rel-5 |
| Feature or Study Item: Deleted - GERAN improvements 3 (new transport layer on interface A) | GEIMP3 | Rel-5 |
| Building Block: Deleted - Evolution of the transport for A | GEIMP3-EtA | Rel-5 |
| Feature or Study Item: GERAN/UTRAN interface evolution 1 (evolution of Iu PS) | GERUEV1 | Rel-5 |
| Building Block: Evolution of Iu ps | GERUEV1-IuPS | Rel-5 |
| Feature or Study Item: GERAN/UTRAN interface evolution 2 (evolution of Iu CS) | GERUEV2 | Rel-5 |
| Building Block: Support of AMR-WB in GERAN: GMSK and 8PSK WB FR / HR | GAMRWB | Rel-5 |
| Feature or Study Item: GERAN Inter BSC NACC improvements over the Gb Interface | GERNACC | Rel-5 |
| Building Block: Modification of Gb protocols for GERAN Inter BSC NACC over Gb Interface | GERNACC-Gbmod | Rel-5 |
| Feature or Study Item: Flow control supporting an MS with multiple data flows with different QoS over the Gb interface | FlowCon | Rel-5 |
| Building Block: GERAN work for Intra Domain Connection of RAN Nodes to Multiple CN Nodes | IDCRAN-GERAN | Rel-5 |
| Building Block: GERAN MS Conformance test for LCS | LCS-GERAN-MSconf | Rel-5 |
| Building Block: Deleted - GERAN BTS Conformance test for LCS | LCS-GERAN-BTSconf | Rel-5 |
| Feature or Study Item: Enhanced Power Control | EPC | Rel-5 |
| Feature or Study Item: 8PSK AMR HR | 8PSK-AH | Rel-5 |
| Feature or Study Item: Awaiting formal work item | DUMMY | Rel-13 |
| Feature or Study Item: (Small) Test Technical Enhancements and Improvements for Rel-13 | TEI13_Test | Rel-13 |
| Building Block: Evolution of Iu cs | GERUEV2-IuCS | Rel-5 |
| Building Block: Location Services for GERAN in A/Gb Mode | LCS-GERAN | Rel-5 |
| Feature or Study Item: (Small) Technical Enhancements and Improvements for Rel-13 | TEI13 | Rel-13 |
| Feature or Study Item: GERAN support for IMS | GERIMS | 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 |
| Building Block: Deleted - GERAN MS Conformance test for support of IMS | GERIMS-MSconf | Rel-5 |
| Building Block: Deleted - GERAN BTS Conformance test for support of IMS | GERIMS-BTSconf | Rel-5 |
| Feature or Study Item: Alignment of 3G functional split and Iu | GER3GAL | Rel-5 |
| Building Block: GERAN user / control plane | GER3GAL-GUCOPL | Rel-5 |
| Building Block: Iu rg interface | GER3GAL-Iurg | Rel-5 |
| Feature or Study Item: Intra Domain Connection of RAN Nodes to Multiple CN Nodes | IUFLEX | Rel-5 |
| Feature or Study Item: Rel-5 Location Services enhancements | LCS1 | Rel-5 |
| Feature or Study Item: Study on Voice services over Adaptive Multi-user channels on One Slot (VAMOS) enhancements | FS_eVAMOS | Rel-12 |
| Feature or Study Item: Network Energy Saving for E-UTRAN | Netw_Energy_LTE | Rel-11 |
| Feature or Study Item: (Small) Technical Enhancements and Improvements for Rel-11 | TEI11 | Rel-11 |
| Feature or Study Item: Rel-9 Improvements of the Radio Interface | RInImp9 | Rel-9 |
| Feature or Study Item: Voice services over Adaptive Multi-user channels on One Slot | VAMOS | Rel-9 |
| Building Block: Stage 2 for Voice services over Adaptive Multi-user channels on One Slot | VAMOS | Rel-9 |
| Building Block: Stage 3 for Voice services over Adaptive Multi-user channels on One Slot | VAMOS | Rel-9 |
| Building Block: VAMOS Radio Performance Requirements | VAMOS | Rel-9 |
| Building Block: Home NB and Home eNB enhancements - GERAN aspects | EHNB-GERAN | Rel-9 |
| Feature or Study Item: Cell Broadcast protocol Base Station Controller Cell Broadcast Centre (BSC-CBC) | CEBRO | Rel-9 |
| Building Block: GERAN part of Cell Broadcast protocol Base Station Controller Cell Broadcast Centre | CEBRO | Rel-9 |
| Building Block: GERAN aspects of AoIP | AoIP | Rel-8 |
| Feature or Study Item: Support of PS Handover for GERAN A/Gb mode | SPSHAGB | Rel-6 |
| Building Block: Stage 2 for Support of PS Handover for GERAN A/Gb mode | SPSHAGB-Stage2 | Rel-6 |
| Building Block: PS handover for Support of PS Handover for GERAN A/Gb mode | SPSHAGB-PSHO | Rel-6 |
| Building Block: Definition of radio resource management functionality for Support of PS Handover for GERAN A/Gb mode | SPSHAGB-RRM | Rel-6 |
| Feature or Study Item: Addition of frequency bands to GSM (TAPS) | TAPS | Rel-6 |
| Feature or Study Item: Addition of U-TDOA in the CS domain | UTDOACS | Rel-6 |
| Feature or Study Item: Addition of U-TDOA in the PS domain | UTDOAPS | Rel-6 |
| Building Block: Deleted - Creation of a TR | SCSAGB-TR | Rel-6 |
| Building Block: Deleted - Stage 2 | SCSAGB-Stage2 | Rel-6 |
| Building Block: Deleted - Radio Channel Support | SCSAGB-RCS | Rel-6 |
| Building Block: Deleted - replaced by 50561 - PS Handover | SCSAGB-PSH | Rel-6 |
| Building Block: FS on GAAI | GAAG | Rel-6 |
| Feature or Study Item: Multiple TBF in A/Gb mode | MULTBF | Rel-6 |
| Building Block: Multiple TBF in A/Gb mode - Core | MULTBF-Agbmode | Rel-6 |
| Feature or Study Item: Single Antenna Receiver Interference Cancellation (SAIC) | SAIC | Rel-6 |
| Feature or Study Item: Generic Access to A/Gb Interface (GAAI) | GAAI | Rel-6 |
| Building Block: GAAI Stage 2 | GAAI-Stage2 | Rel-6 |
| Building Block: GAAI Stage 3 | GAAI-Stage3 | Rel-6 |
| Building Block: MS Conformance Test for GAAI | GAAI-CT | Rel-6 |
| Feature or Study Item: Seamless support of streaming services in A/Gb mode | SSStrea | Rel-6 |
| Feature or Study Item: Location Services enhancements | LCS3 | Rel-7 |
| Feature or Study Item: (Small) Technical Enhancements and Improvements for Rel-7 | TEI7 | Rel-7 |
| Feature or Study Item: Addition of new frequency band to GSM (T-GSM810) | TGSM810 | Rel-7 |
| Building Block: Changes to core specification | TGSM810-Core | Rel-7 |
| Feature or Study Item: Handover of dedicated and shared resources while in Dual Transfer Mode | HODSRDTM | Rel-7 |
| Feature or Study Item: Study on Future GERAN Evolution | FGE | Rel-7 |
| Feature or Study Item: Mobile Station Receive Diversity (DARP Phase II) | MSRD2 | Rel-7 |
| Building Block: MS conformance test of DARP Phase II (MSRD) | MSRD2-Msconf | Rel-7 |
| Building Block: Performance Requirements for Mobile Station Receive Diversity, DARP Phase II | MSRD2-PerfReq | Rel-7 |
| Building Block: Capability signalling of Mobile Station Receive Diversity, DARP Phase II | MSRD2-CapSig | Rel-7 |
| Building Block: Test Scenarios for Mobile Station Receive Diversity, DARP Phase II | MSRD2-TestSc | Rel-7 |
| Feature or Study Item: Downlink Dual Carrier | GDCDL | Rel-7 |
| Feature or Study Item: Support of SIGTRAN in GERAN | GSIGT | Rel-7 |
| Feature or Study Item: Latency Reductions | LATRED | Rel-7 |
| Building Block: Deleted - Extra ACBOP information in GERAN | ACBOP | Rel-7 |
| Feature or Study Item: MS Antenna Performance Evaluation Method and Requirements | APEMR | Rel-7 |
| Feature or Study Item: Lower 700 MHz Inclusion in the GERAN Specifications | GSM710 | Rel-7 |
| Feature or Study Item: Study on GAN Enhancements | EGAN | Rel-7 |
| Feature or Study Item: REduced symbol Duration, Higher Order modulation and Turbo coding (RED HOT) for downlink | REDHOT | Rel-7 |
| Building Block: UE Antenna Performance Evaluation Method and Requirements | RInImp-UEAnt | Rel-7 |
| Feature or Study Item: Advanced Global Navigation Satellite System (AGNSS) concept | LCS3-AGNSS | Rel-7 |
| Feature or Study Item: U-TDOA Enhancement | GUTEN | Rel-8 |
| Building Block: MS conformance test for Intra BSC NACC | GEIMP2-Msconf | Rel-4 |
| Building Block: GERAN QoS Aspects - Handovers: maintenance of real-time QoS while moving between cells in the PLMN including inter-SGSN and SRNS relocation or possibly other mechanisms | GERQoS | Rel-4 |
| Building Block: Gb over IP (Ip-fication of Gb) | GbIP | Rel-4 |
| Feature or Study Item: GERAN improvements 2 (NACC) | GEIMP2 | Rel-4 |
| Building Block: Gb enhancements | Gben | Rel-4 |
| Feature or Study Item: UMTS QoS Architecture for PS Domain | QoSPS | Rel-4 |
| Feature or Study Item: (Small) Technical Enhancements and Improvements for Rel-6 | TEI6 | Rel-6 |
| Feature or Study Item: Multimedia Broadcast and Multicast Service | MBMS | Rel-6 |
| Feature or Study Item: (Small) Test Technical Enhancements and Improvements for Rel-14 | TEI14_Test | Rel-14 |
| Feature or Study Item: (Small) Test Technical Enhancements and Improvements for Rel-14 | TEI14_Test | Rel-14 |
