Mar. 31, 2019 at 4:45 am

Feature Group Indicators (FGI bits) in LTE – Rel. 8, Rel. 9 and Rel. 10

6 years ago

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Feature Group Indicators (FGI bits)

Feature Group Indicator (FGI) is a special Information Element (IE) within UE Capability Information message. The parameters other than FGI in UE Capability Information message provides information about physical layer capability e.g. UE-Category, supported Bands, Carrier Aggregation band combination etc. Feature Group Indicator provides information about radio protocol aspects.

FGI information is used by eNodeB or MME before they set up any procedure for a specific UE. This helps the eNodeB and MME to avoid to direct UE to do something that is not supported.

FGI information is very important for troubleshooting tools for test engineers while debugging an issue. If some UE fails in some procedure like attach, Handover, a specific type of measurement, reconfiguration etc., it would be a good practice to check FGI information from UE and see if the feature or procedure is supported by it.

Example of FGI

RRC featureGroupIndicators = ‘11111110 00001101 11011000 10000000’

The Indexing starts from index 1, which is the leftmost bit in the field. Index 1-32 is for release 8, Index from 33-64 is for release 9 and Index from 101-132 is for release 10.

The meaning of each bit field in FGI is defined as follows in 3GPP specification 36.331.

36.331-Annex B Table B.1-1: Definitions of feature group indicators Release 8(1-32 Bits Index)
36.331-Annex B Table B.1-1a: Definitions of feature group indicators added for Release 9
36.331-Annex C Table C.1-1: Definitions of feature group indicators added for Release 10

36.331-Annex B Table B.1-1

Bit	Definition	Note	FDD/TDD
1	Intra-subframe frequency hopping for PUSCH scheduled by UL grant DCI format 3a (TPC commands for PUCCH and PUSCH with single bit power adjustments) Aperiodic CQI/PMI/RI reporting on PUSCH: Mode 2-0 – UE selected subband CQI without PMI Aperiodic CQI/PMI/RI reporting on PUSCH: Mode 2-2 – UE selected subband CQI with multiple PMI		Yes
2	Simultaneous CQI and ACK/NACK on PUCCH, i.e. PUCCH format 2a and 2b Absolute TPC command for PUSCH Resource allocation type 1 for PDSCH Periodic CQI/PMI/RI reporting on PUCCH : Mode 2-0 = UE selected subband CQI without PMI Mode 2-1 = UE selected subband CQI with single PMI		Yes
3	5 bit RLC UM SN 7 bit PDCP SN	VoLTE Bit 7 = 1	No
4	Short DRX cycle	Bit 5 = 1	Yes
5	Long DRX cycle, DRX command MAC control element		No
6	Prioritised bit rate		No
7	RLC UM	VoLTE	No
8	EUTRA RRC_CONNECTED to UTRA FDD or UTRA TDD CELL_DCH PS handover, if the UE supports either only UTRAN FDD or only UTRAN TDD EUTRA RRC_CONNECTED to UTRA FDD CELL_DCH PS handover, if the UE supports both UTRAN FDD and UTRAN TDD	Bit 22 = 1	Yes
9	EUTRA RRC_CONNECTED to GERAN GSM_Dedicated handover	SRVCC Bit 23 = 1	Yes
10	EUTRA RRC_CONNECTED to GERAN (Packet_) Idle by Cell Change Order (CCO), without or with NACC (Network Assisted Cell Change)		Yes
11	EUTRA RRC_CONNECTED to CDMA2000 1xRTT CS Active handover	SRVCC Bit 24 = 1	Yes
12	EUTRA RRC_CONNECTED to CDMA2000 HRPD Active handover	Bit 26 = 1	Yes
13	Inter-frequency handover within FDD or TDD	Bit 25 = 1	No
14	Event measurement reporting A4 and A5		No
15	Inter RAT Event B1 : UTRAN FDD or UTRAN TDD, if the UE supports either only UTRAN FDD or only UTRAN TDD and has set bit number 22 to 1 UTRAN FDD or UTRAN TDD, if the UE supports both UTRAN FDD and UTRAN TDD and has set bit number 22 or 39 to 1, respectively GERAN, 1xRTT or HRPD, if the UE has set bit number 23, 24 or 26 to 1, respectively	UE has set at least one of the bit number 22, 23, 24, 26 or 39 = 1	Yes
16	Periodical measurement, reportStrongestCells : Intra-frequency Inter-frequency, if Bit 25=1 Inter-RAT UTRAN FDD or UTRAN TDD, if the UE supports either only UTRAN FDD or only UTRAN TDD and has set bit number 22 to 1 Inter-RAT UTRAN FDD or UTRAN TDD, if the UE supports both UTRAN FDD and UTRAN TDD and has set bit number 22 or 39 to 1, respectively Inter-RAT GERAN, 1xRTT or HRPD, if the UE has set bit number 23, 24 or 26 to 1, respectively		No
17	Intra-frequency ANR features periodical measurement, reportStrongestCells and reportCGI	Bit 5 = 1	No
18	Inter-frequency ANR features periodical measurement, reportStrongestCells and reportCGI	Bit 13 = 1	No
19	Inter-RAT ANR features, periodical measurement : reportStrongestCells for GERAN, if bit 23=1 reportStrongestCellsForSON for UTRAN FDD or UTRAN TDD, if the UE supports either only UTRAN FDD or only UTRAN TDD and has set bit number 22 to 1 reportStrongestCellsForSON for UTRAN FDD or UTRAN TDD, if the UE supports both UTRAN FDD and UTRAN TDD and has set bit number 22 or 39 to 1, respectively reportStrongestCellsForSON for 1xRTT or HRPD, if the UE has set bit number 24 or 26 to 1, respectively reportCGI for UTRAN FDD or UTRAN TDD, if the UE supports either only UTRAN FDD or only UTRANTDD and has set bit number 22 to 1 reportCGI for UTRAN FDD or UTRAN TDD, if the UE supports both UTRAN FDD and UTRAN TDD and has set bit number 22 or 39 to 1, respectively reportCGI for GERAN, 1xRTT or HRPD, if the UE has set bit number 23, 24 or 26 to 1, respectively	Bit 5 At least one of the bit number 22, 23, 24 or 26 = 1	Yes
20	SRB1 and SRB2 for DCCH + if Bit 7 == 0 : 8x AM DRB if Bit 7 == 1 : 8x AM DRB, (5x AM DRB + 3x UM DRB)		No
21	Predefineintra– and inter-subframe frequency hopping for PUSCH with N_sb > 1 Predefined inter-subframe frequency hopping for PUSCH with N_sb > 1		No
22	UTRAN FDD or UTRAN TDD measurements, reporting and measurement reporting event B2 in E-UTRA connected mode, if the UE supports either only UTRAN FDD or only UTRAN TDD UTRAN FDD measurements, reporting and measurement reporting event B2 in E-UTRA connected mode, if the UE supports both UTRAN FDD and UTRAN TDD		Yes
23	GERAN measurements, event B2		Yes
24	1xRTT measurements, event B2		Yes
25	Inter-frequency measurements and reporting in E-UTRA connected mode		No
26	HRPD measurements, reporting and measurement reporting event B2 in E-UTRA connected mode		Yes
27	EUTRA RRC_CONNECTED to UTRA FDD or UTRA TDD CELL_DCH CS handover, if the UE supports either only UTRAN FDD or only UTRAN TDD EUTRA RRC_CONNECTED to UTRA FDD CELL_DCH CS handover, if the UE supports both UTRAN FDD and UTRAN TDD	SRVCC Bit 13 = 1	Yes
28	TTI bundling		Yes
29	Semi-Persistent Scheduling (SPS)		Yes
30	Handover between FDD and TDD	Bit 13 = 1	No
31	UE supports cells broadcasting Multi Frequency Band Information (MFBI)		No
32	Undefined

36.331-Annex B Table B.1-1a

Bit	Definition	Note	FDD/TDD
33	Inter-RAT ANR for UTRAN FDD periodical measurement, reportStrongestCellsForSON, reportCGI	Bit 5 & Bit 22 = 1	Yes
34	Inter-RAT ANR for GERAN periodical measurement, reportStrongestCellsForSON, reportCGI	Bit 5 & Bit 23 = 1	Yes
35	Inter-RAT ANR for 1xRTT periodical measurement, reportStrongestCellsForSON, reportCGI	Bit 5 & Bit 24 = 1	Yes
36	Inter-RAT ANR for HRPD periodical measurement, reportStrongestCellsForSON, reportCGI	Bit 5 & Bit 26 = 1	Yes
37	Inter-RAT ANR for UTRAN TDD periodical measurement, reportStrongestCellsForSON, reportCGI	Bit 5 & Bit 39 = 1	Yes
38	EUTRA RRC_CONNECTED to UTRA TDD CELL_DCH PS handover if the UE supports both UTRAN FDD and UTRAN TDD	Bit 39 = 1	Yes
39	UTRAN TDD measurements, reporting event B2 in E-UTRA connected mode if the UE supports both UTRAN FDD and UTRAN TDD		Yes
40	EUTRA RRC_CONNECTED to UTRA TDD CELL_DCH CS handover if the UE supports both UTRAN FDD and UTRAN TDD	SRVCC Bit 38 = 1	Yes
41	Measurement reporting event B1 for UTRAN FDD, if the UE supports UTRAN FDD and has set bit number 22 to 1		Yes
42	DCI format 3a (TPC commands for PUCCH and PUSCH with single bit power adjustments)
43	Undefined
44	Undefined
45	Undefined
46	Undefined
47	Undefined
48	Undefined
49	Undefined
50	Undefined
51	Undefined
52	Undefined
53	Undefined
54	Undefined
55	Undefined
56	Undefined
57	Undefined
58	Undefined
59	Undefined
60	Undefined
61	Undefined
62	Undefined
63	Undefined
64	Undefined

36.331-Annex C Table C.1-1

Bit	Definition	Note	FDD/TDD
101	DMRS with OCC (orthogonal cover code) and SGH (sequence group hopping) disabling	If the UE supports two or more layers for spatial multiplexing in UL, this bit shall be set to 1 If a category 0 UE does not support this feature, this bit shall be set to 0	No
102	Trigger type 1 SRS (aperiodic SRS) transmission (Up to X ports) X = number of supported layers on given band		Yes
103	PDSCH transmission mode 9 when up to 4 CSI reference signal ports are configured	Category 8 UEs	Yes
104	PDSCH transmission mode 9 for TDD when 8 CSI reference signal ports are configured	Category 8 UEs supporting TDD	No
105	Periodic CQI/PMI/RI reporting on PUCCH : Mode 2-0 = UE selected subband CQI without PMI, when PDSCH transmission mode 9 is configured Mode 2-1 = UE selected subband CQI with single PMI, when PDSCH transmission mode 9 and up to 4 CSI reference signal ports are configured	Bit 2 & Bit 103 = 1	Yes
106	Periodic CQI/PMI/RI/PTI reporting on PUCCH : Mode 2-1 = UE selected subband CQI with single PMI, when PDSCH transmission mode 9 and 8 CSI reference signal ports are configured	TDD : bit 104 = 1 FDD : tm9-With-8Tx-FDD-r10 supported and Bit 2 = 1	Yes
107	Aperiodic CQI/PMI/RI reporting on PUSCH : Mode 2-0 = UE selected subband CQI without PMI, when PDSCH transmission mode 9 is configured Mode 2-2 = UE selected subband CQI with multiple PMI, when PDSCH transmission mode 9 and up to 4 CSI reference signal ports are configured	Bit 1 & Bit 103 = 1	Yes
108	Aperiodic CQI/PMI/RI reporting on PUSCH : Mode 2-2 = UE selected subband CQI with multiple PMI, when PDSCH transmission mode 9 and 8 CSI reference signal ports are configured	TDD : bit 104 = 1 FDD : tm9-With-8Tx-FDD-r10 supported and Bit 1 = 1	Yes
109	Periodic CQI/PMI/RI reporting on PUCCH Mode 1-1, submode 1	UE supports PDSCH transmission mode 9 with 8 CSI reference signal ports	Yes
110	Periodic CQI/PMI/RI reporting on PUCCH Mode 1-1, submode 2	UE supports PDSCH transmission mode 9 with 8 CSI reference signal ports	Yes
111	CA : Measurement reporting trigger Event A6	UE supports carrier aggregation	Yes
112	CA : SCell addition within the Handover to EUTRA procedure	UE supports carrier aggregation and the Handover to EUTRA procedure	Yes
113	Trigger type 0 SRS (periodic SRS) transmission on X Serving Cells X = number of supported component carriers in a given band combination	UE supports carrier aggregation in UL	Yes
114	Reporting of both UTRA CPICH RSCP and Ec/N0 in a Measurement Report	Bit 22 = 1	No
115	Time domain ICIC : RLM/RRM measurement subframe restriction for the serving cell RRM measurement subframe restriction for neighbor cells CSI measurement		Yes
116	Relative transmit phase continuity for spatial multiplexing in UL	UE supports two or more layers for spatial multiplexing in UL	Yes
117	Undefined
118	Undefined
119	Undefined
120	Undefined
121	Undefined
122	Undefined
123	Undefined
124	Undefined
125	Undefined
126	Undefined
127	Undefined
128	Undefined
129	Undefined
130	Undefined
131	Undefined
132	Undefined

Ritu Malik

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