5G TF TDD frame

AP
Antenna Port
BRI
Beam Refinement Information
BSI
Beam State Information
CSI
Channel State Information

5G.211 subframe structure (DL / UL)

Table 4.2-2: Example configurations for data subframe structure
Configurations DCI format Symbol index
0 1 2 3 4 5 6 7 8 9 10 11 12 13
0 B1, B2 Dc Dd Dd Dd Dd Dd Dd Dd Dd Dd Dd Dd Dd Dd
0 B1, B2 Dc Dd Dd Dd Dd Dd Dd Dd Dd Dd Dd Dd CSI-RS CSI-RS
1 B1, B2 Dc Dd Dd Dd Dd Dd Dd Dd Dd Dd Dd Dd GP Uc
1 B1, B2 Dc Dd Dd Dd Dd Dd Dd Dd Dd Dd Dd Dd GP SRS
2 B1, B2 Dc Dc Dd Dd Dd Dd Dd Dd Dd Dd Dd Dd Dd Dd
2 B1, B2 Dc Dc Dd Dd Dd Dd Dd Dd Dd Dd Dd Dd CSI-RS CSI-RS
3 B1, B2 Dc Dc Dd Dd Dd Dd Dd Dd Dd Dd Dd Dd GP Uc
3 B1, B2 Dc Dc Dd Dd Dd Dd Dd Dd Dd Dd Dd Dd GP SRS
4 A1, A2 Dc GP Ud Ud Ud Ud Ud Ud Ud Ud Ud Ud Ud Ud
5 A1, A2 Dc GP Ud Ud Ud Ud Ud Ud Ud Ud Ud Ud Ud Uc
5 A1, A2 Dc GP Ud Ud Ud Ud Ud Ud Ud Ud Ud Ud Ud SRS
6 A1, A2 Dc GP Ud Ud Ud Ud Ud Ud Ud Ud Ud Ud Ud CSI-RS
7 A1, A2 Dc GP Ud Ud Ud Ud Ud Ud Ud Ud Ud Ud SRS CSI-RS
8 A1, A2 Dc GP Ud Ud Ud Ud Ud Ud Ud Ud Ud Ud SRS Uc
9 Dc Dc BRRS BRRS BRRS BRRS BRRS BRRS BRRS BRRS BRRS BRRS GP Uc
9 Dc Dc BRRS BRRS BRRS BRRS BRRS BRRS BRRS BRRS BRRS BRRS GP SRS
10 Dc Dc BRRS BRRS BRRS BRRS BRRS BRRS BRRS BRRS BRRS BRRS CSI-RS CSI-RS

Dc
Downlink symbol reserved for donwlink control channel transmissions
Dd
Downlink symbol reserved for donwlink data channel transmissions
Uc
Uplink symbol reserved for uplink control channel transmissions
Ud
Uplink symbol reserved for uplink data channel transmissions
GP
Symbol reserved for guard period between downlink and uplink transmissions
CSI-RS
Channel State Information Reference Signal
BRRS
Beam Refinement Reference Signal
SRS
Sounding Reference Signal

5G.212 Downlink Control information (Dc)

§ 5.3.3: DCI formats summary
Format Channel scheduling Discriminator
(2 bits)
Subframe structure
configuration
A1 xPUSCH 00 Config 4, 5, 6, 7 or 8
A2 xPUSCH 01
B1 xPDSCH 10 Config 0, 1, 2 or 3
B2 xPDSCH 11

DCI format A1 : xPUSCH scheduling

DCI A1 with one or more RB assignment

Field Nb of bits Value Description
DCI format discriminator 2 00 Uplink format A1
xPUSCH range 2 5G.213 §9.2
xPUSCH starting OFDM symbol : always the 3rd symbol
00 : the stopping of xPUSCH is the 12th symbol
01 : the stopping of xPUSCH is the 13th symbol
10 : the stopping of xPUSCH is the final (14th) symbol
11 : Reserved
Transmission timing of xPUSCH 3 l ∈ {0, 1, …, 7} xPUSCH is scheduled in subframe n + 4 + l + m
n is the current subframe
m is indicated by the "transmission timing of CSI-RS / BRRS" field
RB assignment 9 ≤324(Dec) 5G.213 §8.1.4
Resource indication value RIV = f (VRBGstart, LCVRBGs); NULVRBG = 25
HARQ process number 4
MCS 4 5G.213 §8.1.5
IMCS in the range of 0 to 14
NDI 1 Value toggles when new data is signalled
CSI / BSI / BRI request 3 000 : none of CSI/BSI/BRI is requested
001 : triggers BSI reporting
010 : allocates BRRS and also triggers corresponding BRI reporting
011 : allocates BRRS but does not trigger corresponding BRI reporting
100 : allocates CSI-RS and also triggers corresponding CSI reporting
101, 110, 111 : Reserved
Transmission timing of CSI-RS / BRRS 2 m ∈ {0, 1, 2, 3} If (CSI/BSI/BRI request = 010, 011 or 100)
  then the corresponding transmission is allocated in subframe n + m
n is the current subframe
OFDM symbol index for CSI-RS / BRRS allocations 2 If this DCI format allocates CSI-RS, this field indicates OFDM symbols used for CSI-RS transmission
  00 : 13th symbol
  01 : 14th symbol
  10 : 13 & 14th symbol
  11 : Reserved
Else if this DCI format allocates BRRS and higher-layer gives either of 1 or 2 symbol BRRS configuration, this field indicates OFDM symbols used for BRRS transmission
  00 : 13th symbol
  01 : 14th symbol
  10 : 13 & 14th symbol
  11 : Reserved
Else if this DCI format allocates BRRS and higher-layer gives either of 5 or 10 symbol BRRS configuration, then this field indicates OFDM symbols used for BRRS transmission
  00 : 5 symbols in slot 0
  01 : 5 symbols in slot 1
  10 : 10 symbols
  11 : Reserved
CSI-RS or BRRS process indicator /
Number of BSI reports
2 If this DCI format allocates either of CSI-RS or BRRS transmission
  00 : process #0
  01 : process #1
  10 : process #2
  11 : process #3
Else if this DCI format triggers BSI request
  00 : 1 BSI report
  01 : 2 BSI reports
  10 : 4 BSI reports
  11 : Reserved
UCI on xPUSCH w/o xUL-SCH data 1 If UCI report is triggered
  0 : allows multiplexing of xUL-SCH data and UCI
  1 : allows only UCI transmission on xPUSCH
Else
  0 : Reserved
Beam switch indication 1 0 : UE is not required to switch the serving beam
1 : UE shall switch the serving beam
SRS request 3 MSB 2 bits are used for the indication of SRS configurations
  00 : No SRS request
  01 : Config #0
  10 : Config #1
  11 : Config #2
LSB 1 bit
  if (MSB 2 bits = No SRS request)
    0 : this field is invalid
  else
    0 : SRS transmission on the 13th OFDM symbol in subframe n + 4 + l + m + 1
    1 : SRS transmission on the 14th OFDM symbol in subframe n + 4 + l + m + 1
Number of layers and RE mapping index for DMRS/PCRS 3 0 : 1 Layer, k0 = 0
1 : 1 Layer, k0 = 1
2 : 1 Layer, k0 = 2
3 : 1 Layer, k0 = 3
4 : 2 Layers, k0 = 0 and k1 = 1
5 : 2 Layers, k0 = 2 and k1 = 3
6,7 : Reserved
SCID 1 Used for DMRS/PCRS associated with xPUSCH in subframe n,
and DMRS associated with xPUCCH in subframe n + 4 + l + m
0 : nSCID = 0
1 : nSCID = 1
Precoding matrix indicator 3 5G.211 §5.3.3
TPC command for xPUSCH 2 5G.213 §6.1.1 δxPUSCH,c
0 : accumulated -1 dB, absolute -4 dB
1 : accumulated 0 dB, absolute -1 dB
2 : accumulated +1 dB, absolute +1 dB
3 : accumulated +3 dB, absolute +4 dB
UL dual PCRS 1 If single-layer transmission is triggered
0 : scheduled xPUSCH uses a PCRS AP corresponding to a DM-RS AP
1 : scheduled xPUSCH uses two PCRS AP(s); the first AP is corresponding to the allocated DM-RS AP and the second AP is one whose REs are co-located in the same subcarrier with the first PCRS AP

DCI A1 with zero RB assignment

Only the following fields have different values

Field Nb of bits Value Description
Transmission timing of xPUSCH 3 000 Set to all zeros
RB assignment 9 325(Dec) Zero RB assignment
Reserved 9 0 HARQ, MCS, NDI fields set to 0

DCI A1 with random access initiated by a xPDCCH order (zero RB assignment)

Only the following fields have different values

Field Nb of bits Value Description
Transmission timing of xPUSCH 3 000 Set to all zeros
RB assignment 9 326(Dec) 0x146
Frequency band index 3 5G.211 §5.7.2
nRACH
OCC indicator 1 0 : f' = 0
1 : f' = 1
Cyclic shift indicator 2 5G.211 §5.7.2
ν
{0,1,2} for format 0
{0} for format 1
Reserved 3 0

DCI format A2 : xPUSCH scheduling

Up to 2 layer transmission
All of the information fields in the DCI format A1 are also used for DCI format A2 except the following field

Field Nb of bits Value Description
DCI format discriminator 2 01 Uplink format A2

DCI format B1 : xPDSCH scheduling

DCI B1 with one or more RB assignment

Field Nb of bits Value Description
DCI format discriminator 2 10 Downlink format B1
xPDSCH range 2 5G.213 §8.1.4
MSB (starting of xPDSCH including DMRS symbol)
  0 : 2nd symbol
  1 : 3rd symbol
LSB (stopping of xPDSCH)
  0 : 12th symbol
  1 : 14th symbol
RB assignment 9 ≤324(Dec) 5G.213 §8.1.4
Resource indication value RIV = f (VRBGstart, LCVRBGs); NDLVRBG = 25
HARQ process number 4
MCS 4 5G.213 §8.1.5
IMCS in the range of 0 to 14
NDI 1 Value toggles when new data is signalled
Redundancy version 2 rvidx = 0, 1, 2 or 3
Bit-mapping index for HARQ-ACK multiplexing (BMI) 3 5G.213 §8.5
RRC ackNackBitmapSize
CSI / BSI / BRI request 3 000 : none of CSI/BSI/BRI is requested
001 : triggers BSI reporting
010 : allocates BRRS and also triggers corresponding BRI reporting
011 : allocates BRRS but does not trigger corresponding BRI reporting
100 : allocates CSI-RS and also triggers corresponding CSI reporting
101, 110, 111 : Reserved
Transmission timing of CSI-RS / BRRS 2 m ∈ {0, 1, 2, 3} If (CSI/BSI/BRI request = 010, 011 or 100)
  then the corresponding transmission is allocated in subframe n + m
  n is the current subframe
OFDM symbol index for CSI-RS / BRRS allocations 2 If this DCI format allocates CSI-RS, this field indicates OFDM symbols used for CSI-RS transmission
  00 : 13th symbol
  01 : 14th symbol
  10 : 13 & 14th symbol
  11 : Reserved
Else if this DCI format allocates BRRS and higher-layer gives either of 1 or 2 symbol BRRS configuration, this field indicates OFDM symbols used for BRRS transmission
  00 : 13th symbol
  01 : 14th symbol
  10 : 13 & 14th symbol
  11 : Reserved
Else if this DCI format allocates BRRS and higher-layer gives either of 5 or 10 symbol BRRS configuration, then this field indicates OFDM symbols used for BRRS transmission
  00 : 5 symbols in slot 0
  01 : 5 symbols in slot 1
  10 : 10 symbols
  11 : Reserved
CSI-RS or BRRS process indicator 2 If this DCI format allocates either of CSI-RS or BRRS transmission
  00 : process #0
  01 : process #1
  10 : process #2
  11 : process #3
Transmission timing of xPUCCH for UCI report 3 k ∈ {0, 1, …, 7} xPUCCH transmission is allocated in subframe n + 4 + k + m
Frequency resource index of xPUCCH for UCI report 4 n(2)xPUCCH
Beam switch indication 1 0 : UE is not required to switch the serving beam
1 : UE shall switch the serving beam
SRS request 3 MSB 2 bits are used for the indication of SRS configurations
  00 : No SRS request
  01 : Config #0
  10 : Config #1
  11 : Config #2
LSB 1 bit
  if (MSB 2 bits = No SRS request)
    0 : this field is invalid
  else
    0 : SRS transmission on the 13th OFDM symbol in subframe n + 4 + m + k + 1
    1 : SRS transmission on the 14th OFDM symbol in subframe n + 4 + m + k + 1
Antenna port(s) and number of layers 4 OCC = Orthogonal Cover Code
0 : 1 Layer, port 8 (Ch. estimation w/o OCC)
1 : 1 Layer, port 9 (Ch. estimation w/o OCC)
2 : 1 Layer, port 10 (Ch. estimation w/o OCC)
3 : 1 Layer, port 11 (Ch. estimation w/o OCC)
4 : 2 Layers, ports {8, 9} (Ch. estimation w/o OCC)
5 : 2 Layers, ports {10, 11} (Ch. estimation w/o OCC)
6 : 2 Layers, ports {8, 12} (OCC = 2)
7 : 2 Layers, ports {9, 13} (OCC = 2)
8 : 2 Layers, ports {10, 14} (OCC = 2)
9 : 2 Layers, ports {11, 15} (OCC = 2)
10-15 : Reserved
SCID 1 Used for DMRS/PCRS associated with xPDSCH in subframe n,
and DMRS associated with xPUCCH in subframe n + 4 + k + m
0 : nSCID = 0
1 : nSCID = 1
TPC command for xPUCCH 2 5G.213 §6.1.2 δxPUCCH,c
0 : -1 dB
1 : 0 dB
2 : +1 dB
3 : +3 dB
DL PCRS 2 00 : No DL PCRS (Phase noise Compensation Reference Signal)
01 : PCRS on Antenna Port 60
10 : PCRS on AP 61
11 : PCRS on AP 60 and 61

DCI B1 with zero RB assignment

Only the following fields have different values

Field Nb of bits Value Description
RB assignment 9 325(Dec) Zero RB assignment
Reserved 14 0 HARQ, MCS, NDI, RV, Bitmap fields set to 0

DCI B1 with random access initiated by a xPDCCH order (zero RB assignment)

Only the following fields have different values

Field Nb of bits Value Description
RB assignment 9 326(Dec) Random access, zero RB assignment
Frequency band index 3 5G.211 §5.7.2
nRACH
OCC indicator 1 0 : f' = 0
1 : f' = 1
Cyclic shift indicator 2 5G.211 §5.7.2
ν
{0,1,2} for format 0
{0} for format 1
Reserved 8 0 Set to 0

DCI format B2 : xPDSCH scheduling

Up to 2 layer transmission
All of the information fields in the DCI format B1 are also used for DCI format B2 except the following field

Field Nb of bits Value Description
DCI format discriminator 2 11 Uplink format B2