9.1.4 EPDCCH assignment procedure
36.2133GPPEvolved Universal Terrestrial Radio Access (E-UTRA)Physical layer proceduresRelease 17TS
For each serving cell, higher layer signalling can configure a UE with one or two EPDCCH-PRB-sets for EPDCCH monitoring. The PRB-pairs corresponding to an EPDCCH-PRB-set are indicated by higher layers as described in Clause 9.1.4.4. Each EPDCCH-PRB-set consists of set of ECCEs numbered from 0 to 
where 
is the number of ECCEs in EPDCCH-PRB-set 
of subframe 
. Each EPDCCH-PRB-set can be configured for either localized EPDCCH transmission or distributed EPDCCH transmission.
The UE shall monitor a set of EPDCCH candidates on one or more activated serving cells as configured by higher layer signalling for control information, where monitoring implies attempting to decode each of the EPDCCHs in the set according to the monitored DCI formats.
A BL/CE UE is not required to monitor EPDCCH.
A UE configured with higher layer parameter shortProcessingTime or shortTTI for a serving cell is not required to monitor EPDCCH for the serving cell or on that serving cell.
If a UE is configured with higher layer parameter shortTTI for a serving cell, and if the UE does not support epdcch-STTI-differentCells-r15 (3GPP TS 36.331 [11]), the UE is not expected to monitor EPDCCH for any serving cell.
If a UE is configured with higher layer parameter shortProcessingTime for a serving cell, and if the UE does not support epdcch-SPT-differentCells-r15 (3GPP TS 36.331 [11]), the UE is not expected to monitor EPDCCH for any serving cell.
A UE is not required to monitor EPDCCH in an MBSFN subframe with zero-size non-MBSFN region.
The set of EPDCCH candidates to monitor are defined in terms of EPDCCH UE-specific search spaces.
For each serving cell, the subframes in which the UE monitors EPDCCH UE-specific search spaces are configured by higher layers.
The UE shall not monitor EPDCCH
– For TDD and normal downlink CP, in special subframes for the special subframe configurations 0 and 5, or for frame structure type 3, in the subframe with the same duration as the DwPTS duration of the special subframe configurations 0 and 5, shown in Table 4.2-1 of [3], or for the special subframe configuration 10 configured by the higher layer signalling ssp10-CRS-LessDwPTS.
– For TDD and extended downlink CP, in special subframes for the special subframe configurations 0, 4 and 7 shown in Table 4.2-1 of [3].
– In subframes indicated by higher layers to decode PMCH.
– For TDD and if the UE is configured with different UL/DL configurations for the primary and a secondary cell, in a downlink subframe on the secondary cell when the same subframe on the primary cell is a special subframe and the UE is not capable of simultaneous reception and transmission on the primary and secondary cells.
An EPDCCH UE-specific search space 
at aggregation level 
is defined by a set of EPDCCH candidates.
For an EPDCCH-PRB-set 
, the ECCEs corresponding to EPDCCH candidate m of the search space 
are given by
where
is defined below,
if the UE is configured with a carrier indicator field for the serving cell on which EPDCCH is monitored, otherwise 
is the carrier indicator field value,
is the maximum number of EPDCCH candidates among all the configured DCI formats over all the configured carrier indicator field values for an aggregation level L in EPDCCH-PRB-set p if the UE is configured with uplink transmission on a LAA SCell, otherwise, 
is the nominal number of EPDCCH candidates at aggregation level L in EPDCCH-PRB-set p determined according to Tables 9.1.4-1a to 9.1.4-5b by replacing 
with 
,
.
If the UE is not configured with a carrier indicator field for the serving cell on which EPDCCH is monitored, 
is the number of EPDCCH candidates to monitor at aggregation level 
in EPDCCH-PRB-set 
for the serving cell on which EPDCCH is monitored, as given in Tables 9.1.4-1a, 9.1.4-1b, 9.1.4-2a, 9.1.4-2b, 9.1.4-3a, 9.1.4-3b, 9.1.4-4a, 9.4.4-4b, 9.1.4-5a, 9.1.4-5b below; otherwise, 
is the number of EPDCCH candidates to monitor at aggregation level 
in EPDCCH-PRB-set 
for the serving cell indicated by 
.
If a UE is configured with higher layer parameter pdcch-candidateReductions for a specific search space at aggregation level L in EPDCCH-PRB-set 
for a serving cell, the corresponding number of EPDCCH candidates is given by 
, where the value of 
is determined according to Table 9.1.1-2 and 
is determined according to Tables 9.1.4-1a to 9.1.4-5b by replacing 
with 
.
If a UE is configured with a LAA SCell for UL transmissions and if the UE is configured with higher layer parameter pdcch-candidateReductions-Format0A for a UE specific search space at aggregation level L in EPDCCH-PRB-set 
for the LAA SCell, the corresponding number of EPDCCH candidates for DCI format 0A is given by 
, where the value of 
is determined according to Table 9.1.1-2 and 
is determined according to Tables 9.1.4-1a to 9.1.4-5b by replacing 
with 
.
If a UE is configured with a LAA SCell for UL transmissions and if the UE is configured with higher layer parameter pdcch-candidateReductions-Format0B-4A-4B-AL1-2 for a UE specific search space of the first and second aggregation level in EPDCCH-PRB-set 
for the LAA SCell, the corresponding number of EPDCCH candidates for DCI format 0B/4A/4B is given by 
, where the value of 
is determined according to Table 9.1.1-2 and 
is determined according to Tables 9.1.4-1a to 9.1.4-5b by replacing 
with 
.
If a UE is configured with a LAA SCell for UL transmissions and if the UE is configured with higher layer parameter pdcch-candidateReductions-Format0B-4A-4B-AL3-5 for a UE specific search space of the third, fourth, and fifth aggregation level in EPDCCH-PRB-set 
for the LAA SCell, the corresponding number of EPDCCH candidates for DCI format 0B/4A/4B is given by 
, where the value of 
is determined according to Table 9.1.1-3 and 
is determined according to Tables 9.1.4-1a to 9.1.4-5b by replacing 
with 
.
If a UE is configured with higher layer parameter cif-InSchedulingCell-r13, the carrier indicator field value corresponds to cif-InSchedulingCell-r13, otherwise the carrier indicator field value is the same as ServCellIndex given in [11].
If a UE is configured with a LAA SCell for UL transmissions, and if the UE is configured with higher layer parameter cif-InSchedulingCell-r14 for the LAS SCell, the carrier indicator field value in EPDCCH scheduling PUSCH corresponds to cif-InSchedulingCell-r14, otherwise, the carrier indicator field value is the same as ServCellIndex given in [11].
A UE is not expected to monitor an EPDCCH candidate, if an ECCE corresponding to that EPDCCH candidate is mapped to a PRB pair that overlaps in frequency with a transmission of either PBCH or primary or secondary synchronization signals in the same subframe.
If a UE is configured with two EPDCCH-PRB-sets with the same 
value (where 
is defined in Clause 6.10.3A.1 in [3]), if the UE receives an EPDCCH candidate with a given DCI payload size corresponding to one of the EPDCCH-PRB-sets and mapped only to a given set of REs (as described in Clause 6.8A.5 in [3]), and if the UE is also configured to monitor an EPDCCH candidate with the same DCI payload size and corresponding to the other EPDCCH-PRB-set and which is mapped only to the same set of REs, and if the number of the first ECCE of the received EPDCCH candidate is used for determining PUCCH resource for HARQ-ACK transmission (as described in Clause 10.1.2 and Clause 10.1.3), the number of the first ECCE shall be determined based on EPDCCH-PRB-set 
.
The variable 
is defined by
where 
, 
, 
, 
and 
, 
is the slot number within a radio frame. The RNTI value used for 
is defined in Clause 7.1 in downlink and Clause 8 in uplink. The DCI formats that the UE shall monitor depend on the configured transmission mode per each serving cell as defined in Clause 7.1.
If a UE is configured with higher layer parameter skipMonitoringDCI-format0-1A for a serving cell, the UE is not required to monitor the EPDCCH with DCI Format 0/1A in the UE specific search space for that serving cell.
If a UE is configured with a LAA SCell for UL transmissions and if the UE is configured with higher layer parameter skipMonitoringDCI-format0A for the LAA SCell, the UE is not required to monitor the EPDCCH with DCI Format 0A in the UE specific search space for the LAA SCell.
If a UE is configured with a LAA SCell for UL transmissions and if the UE is configured in transmission mode 2 and if the UE is configured with higher layer parameter skipMonitoringDCI-format4A for the LAA SCell, the UE is not required to monitor the EPDCCH with DCI Format 4A in the UE specific search space for the LAA SCell.
If a UE is configured with a LAA SCell for UL transmissions and if the UE is configured with higher layer parameter enableMonitoringDCI-format0B for the LAA SCell, the UE is required to monitor the EPDCCH with DCI Format 0B in the UE specific search space for the LAA SCell.
If a UE is configured with a LAA SCell for UL transmissions and if the UE is configured in transmission mode 2 and if the UE is configured with higher layer parameter enableMonitoringDCI-format4B for the LAA SCell, the UE is required to monitor the EPDCCH with DCI Format 4B in the UE specific search space for the LAA SCell.
If a serving cell is a LAA Scell, and if the higher layer parameter subframeStartPosition for the Scell indicates ‘s07’
– the UE monitors EPDCCH UE-specific search space candidates on the Scell assuming they start in both the first slot and the second slot of a subframe.
The aggregation levels defining the search spaces and the number of monitored EPDCCH candidates is given as follows
– For a UE configured with only one EPDCCH-PRB-set for distributed transmission, the aggregation levels defining the search spaces and the number of monitored EPDCCH candidates are listed in Table 9.1.4-1a, Table 9.1.4-1b.
– For a UE configured with only one EPDCCH-PRB-set for localized transmission, the aggregation levels defining the search spaces and the number of monitored EPDCCH candidates are listed in Table 9.1.4-2a, Table 9.1.4-2b.
– For a UE configured with two EPDCCH-PRB-sets for distributed transmission, the aggregation levels defining the search spaces and the number of monitored EPDCCH candidates are listed in Table 9.1.4-3a, 9.1.4-3b.
– For a UE configured with two EPDCCH-PRB-sets for localized transmission, the aggregation levels defining the search spaces and the number of monitored EPDCCH candidates are listed in Table 9.1.4-4a, 9.4.4-4b.
– For a UE configured with one EPDCCH-PRB-set for distributed transmission, and one EPDCCH-PRB-set for localized transmission, the aggregation levels defining the search spaces and the number of monitored EPDCCH candidates are listed in Table 9.1.4-5a, 9.1.4-5b.
If the UE is not configured with a carrier indicator field for the serving cell on which EPDCCH is monitored, 
of the serving cell on which EPDCCH is monitored. If the UE is configured with a carrier indicator field for the serving cell on which EPDCCH is monitored, 
of the serving cell indicated by 
.
For Tables 9.1.4-1a, 9.1.4-1b, 9.1.4-2a, 9.1.4-2b, 9.1.4-3a, 9.1.4-3b, 9.1.4-4a, 9.4.4-4b, 9.1.4-5a, 9.1.4-5b
– Case 1 applies
– for normal subframes and normal downlink CP when DCI formats 2/2A/2B/2C/2D are monitored and 
, or
– for frame structure type 3, for downlink subframes with PDSCH transmissions starting in the second slot,
– for special subframes with special subframe configuration 3,4,8 for frame structure type 2 or the subframes with the same duration as the DwPTS duration of a special subframe configuration 3,4,8 for frame structure type 3, and normal downlink CP when DCI formats 2/2A/2B/2C/2D are monitored and 
, or
– for normal subframes and normal downlink CP when DCI formats 1A/1B/1D/1/2/2A/2B/2C/2D/0/0A/0B/4/4A/4B/5/6-0A/6-0B/6-1A/6-1B are monitored, and when 
(
defined in Clause 6.8A.1 in [3]), or
– for special subframes with special subframe configuration 3, 4, 8 for frame structure type 2 or the subframes with the same duration as the DwPTS duration of a special subframe configuration 3,4,8 for frame structure type 3, and normal downlink CP when DCI formats 1A/1B/1D/1/2A/2/2B/2C/2D/0/0A/0B/4/4A/4B/5/6-0A/6-0B/6-1A/6-1B are monitored, and when 
(
defined in Clause 6.8A.1 in [3]);
– Case 2 applies
– for normal subframes and extended downlink CP when DCI formats 1A/1B/1D/1/2A/2/2B/2C/2D/0/0A/0B/4/4A/4B/5/6-0A/6-0B/6-1A/6-1B are monitored or,
– for special subframes with special subframe configuration 1, 2, 6, 7, 9, 10 for frame structure type 2 or the subframes with the same duration as the DwPTS duration of a special subframe configuration 1, 2, 6, 7, 9, 10 for frame structure type 3, and normal downlink CP when DCI formats 1A/1B/1D/1/2A/2/2B/2C/2D/0/0A/0B/4/4A/4B/5/6-0A/6-0B/6-1A/6-1B are monitored, or
– for special subframes with special subframe configuration 1,2,3,5,6 and extended downlink CP when DCI formats 1A/1B/1D/1/2A/2/2B/2C/2D/0/0A/0B/4/4A/4B/5/6-0A/6-0B/6-1A/6-1B are monitored;
– otherwise
– Case 3 is applied.
is the number of PRB-pairs constituting EPDCCH-PRB-set 
.
Table 9.1.4-1a: EPDCCH candidates monitored by a UE
(One Distributed EPDCCH-PRB-set – Case1, Case 2)
|
|
Number of EPDCCH candidates |
Number of EPDCCH candidates |
||||||||
|
L=2 |
L=4 |
L=8 |
L=16 |
L=32 |
L=1 |
L=2 |
L=4 |
L=8 |
L=16 |
|
|
2 |
4 |
2 |
1 |
0 |
0 |
4 |
2 |
1 |
0 |
0 |
|
4 |
8 |
4 |
2 |
1 |
0 |
8 |
4 |
2 |
1 |
0 |
|
8 |
6 |
4 |
3 |
2 |
1 |
6 |
4 |
3 |
2 |
1 |
for Case 1Table 9.1.4-1b: EPDCCH candidates monitored by a UE
(One Distributed EPDCCH-PRB-set – Case 3)
|
|
Number of EPDCCH candidates |
||||
|
L=1 |
L=2 |
L=4 |
L=8 |
L=16 |
|
|
2 |
8 |
4 |
2 |
1 |
0 |
|
4 |
4 |
5 |
4 |
2 |
1 |
|
8 |
4 |
4 |
4 |
2 |
2 |
for Case 3Table 9.1.4-2a: EPDCCH candidates monitored by a UE
(One Localized EPDCCH-PRB-set – Case1, Case 2)
|
|
Number of EPDCCH candidates |
Number of EPDCCH candidates |
||||||
|
L=2 |
L=4 |
L=8 |
L=16 |
L=1 |
L=2 |
L=4 |
L=8 |
|
|
2 |
4 |
2 |
1 |
0 |
4 |
2 |
1 |
0 |
|
4 |
8 |
4 |
2 |
1 |
8 |
4 |
2 |
1 |
|
8 |
6 |
6 |
2 |
2 |
6 |
6 |
2 |
2 |
for Case 1Table 9.1.4-2b: EPDCCH candidates monitored by a UE
(One Localized EPDCCH-PRB-set – Case 3)
|
|
Number of EPDCCH candidates |
|||
|
L=1 |
L=2 |
L=4 |
L=8 |
|
|
2 |
8 |
4 |
2 |
1 |
|
4 |
6 |
6 |
2 |
2 |
|
8 |
6 |
6 |
2 |
2 |
for Case 3.
Table 9.1.4-3a: EPDCCH candidates monitored by a UE
(Two Distributed EPDCCH-PRB-sets – Case1, Case 2)
|
|
|
Number of EPDCCH candidates |
Number of EPDCCH candidates |
||||||||
|
L=2 |
L=4 |
L=8 |
L=16 |
L=32 |
L=1 |
L=2 |
L=4 |
L=8 |
L=16 |
||
|
2 |
2 |
4,4 |
2,2 |
1,1 |
0,0 |
0,0 |
4,4 |
2,2 |
1,1 |
0,0 |
0,0 |
|
4 |
4 |
3,3 |
3,3 |
1,1 |
1,1 |
0,0 |
3,3 |
3,3 |
1,1 |
1,1 |
0,0 |
|
8 |
8 |
3,3 |
2,2 |
1,1 |
1,1 |
1,1 |
3,3 |
2,2 |
1,1 |
1,1 |
1,1 |
|
4 |
2 |
5,3 |
3,2 |
1,1 |
1,0 |
0,0 |
5,3 |
3,2 |
1,1 |
1,0 |
0,0 |
|
8 |
2 |
4,2 |
4,2 |
1,1 |
1,0 |
1,0 |
4,2 |
4,2 |
1,1 |
1,0 |
1,0 |
|
8 |
4 |
3,3 |
2,2 |
2,1 |
1,1 |
1,0 |
3,3 |
2,2 |
2,1 |
1,1 |
1,0 |
for Case 1
for Case 2Table 9.1.4-3b: EPDCCH candidates monitored by a UE
(Two Distributed EPDCCH-PRB-sets – Case 3)
|
|
|
Number of EPDCCH candidates |
||||
|
L=1 |
L=2 |
L=4 |
L=8 |
L=16 |
||
|
2 |
2 |
2,2 |
3,3 |
2,2 |
1,1 |
0,0 |
|
4 |
4 |
2,2 |
2,2 |
2,2 |
1,1 |
1,1 |
|
8 |
8 |
2,2 |
2,2 |
2,2 |
1,1 |
1,1 |
|
4 |
2 |
3,1 |
3,2 |
3,1 |
1,1 |
1,0 |
|
8 |
2 |
3,1 |
4,1 |
3,1 |
1,1 |
1,0 |
|
8 |
4 |
2,2 |
2,2 |
2,2 |
1,1 |
1,1 |
for Case 3Table 9.1.4-4a: EPDCCH candidates monitored by a UE
(Two Localized EPDCCH-PRB-sets – Case1, Case 2)
|
|
|
Number of EPDCCH candidates |
Number of EPDCCH candidates |
||||||
|
L=2 |
L=4 |
L=8 |
L=16 |
L=1 |
L=2 |
L=4 |
L=8 |
||
|
2 |
2 |
4,4 |
2,2 |
1,1 |
0,0 |
4,4 |
2,2 |
1,1 |
0,0 |
|
4 |
4 |
3,3 |
3,3 |
1,1 |
1,1 |
3,3 |
3,3 |
1,1 |
1,1 |
|
8 |
8 |
3,3 |
3,3 |
1,1 |
1,1 |
3,3 |
3,3 |
1,1 |
1,1 |
|
4 |
2 |
4,3 |
4,2 |
1,1 |
1,0 |
4,3 |
4,2 |
1,1 |
1,0 |
|
8 |
2 |
5,2 |
4,2 |
1,1 |
1,0 |
5,2 |
4,2 |
1,1 |
1,0 |
|
8 |
4 |
3,3 |
3,3 |
1,1 |
1,1 |
3,3 |
3,3 |
1,1 |
1,1 |
for Case 1
for Case 2Table 9.1.4-4b: EPDCCH candidates monitored by a UE
(Two Localized EPDCCH-PRB-sets – Case 3)
|
|
|
Number of EPDCCH candidates |
|||
|
L=1 |
L=2 |
L=4 |
L=8 |
||
|
2 |
2 |
3,3 |
3,3 |
1,1 |
1,1 |
|
4 |
4 |
3,3 |
3,3 |
1,1 |
1,1 |
|
8 |
8 |
3,3 |
3,3 |
1,1 |
1,1 |
|
4 |
2 |
4,2 |
4,2 |
1,1 |
1,1 |
|
8 |
2 |
4,2 |
4,2 |
1,1 |
1,1 |
|
8 |
4 |
3,3 |
3,3 |
1,1 |
1,1 |
for Case 3Table 9.1.4-5a: EPDCCH candidates monitored by a UE (NOTE)
|
|
|
Number of EPDCCH candidates |
Number of EPDCCH candidates |
||||||||
|
L=2 |
L=4 |
L=8 |
L=16 |
L=32 |
L=1 |
L=2 |
L=4 |
L=8 |
L=16 |
||
|
2 |
2 |
4,4 |
2,2 |
1,1 |
0,0 |
0,0 |
4,4 |
2,2 |
1,1 |
0,0 |
0,0 |
|
4 |
4 |
4,2 |
4,3 |
0,2 |
0,1 |
0,0 |
4,2 |
4,3 |
0,2 |
0,1 |
0,0 |
|
8 |
8 |
4,1 |
4,2 |
0,2 |
0,2 |
0,1 |
4,1 |
4,2 |
0,2 |
0,2 |
0,1 |
|
2 |
4 |
4,3 |
2,4 |
0,2 |
0,1 |
0,0 |
4,3 |
2,4 |
0,2 |
0,1 |
0,0 |
|
2 |
8 |
4,1 |
2,2 |
0,4 |
0,2 |
0,1 |
4,1 |
2,2 |
0,4 |
0,2 |
0,1 |
|
4 |
2 |
5,2 |
4,2 |
1,1 |
1,0 |
0,0 |
5,2 |
4,2 |
1,1 |
1,0 |
0,0 |
|
4 |
8 |
4,1 |
4,2 |
0,2 |
0,2 |
0,1 |
4,1 |
4,2 |
0,2 |
0,2 |
0,1 |
|
8 |
2 |
5,1 |
4,2 |
2,1 |
1,0 |
0,0 |
5,1 |
4,2 |
2,1 |
1,0 |
0,0 |
|
8 |
4 |
6,1 |
4,2 |
0,2 |
0,1 |
0,0 |
6,1 |
4,2 |
0,2 |
0,1 |
0,0 |
|
NOTE: One localized EPDCCH-PRB-set and one distributed EPDCCH-PRB-set, – Case1, Case 2; |
|||||||||||
for Case 1
for Case 2
is the identity of the localized EPDCCH-PRB-set,
is the identity of the distributed EPDCCH-PRB-setTable 9.1.4-5b: EPDCCH candidates monitored by a UE (NOTE)
|
|
|
Number of EPDCCH candidates |
||||
|
L=1 |
L=2 |
L=4 |
L=8 |
L=16 |
||
|
2 |
2 |
4,1 |
4,2 |
2,2 |
0,1 |
0,0 |
|
4 |
4 |
4,1 |
4,1 |
2,2 |
0,1 |
0,1 |
|
8 |
8 |
4,1 |
4,1 |
2,2 |
0,1 |
0,1 |
|
2 |
4 |
4,1 |
4,1 |
2,2 |
0,1 |
0,1 |
|
2 |
8 |
4,1 |
4,1 |
2,2 |
0,1 |
0,1 |
|
4 |
2 |
4,1 |
4,1 |
2,2 |
1,1 |
0,0 |
|
4 |
8 |
4,1 |
4,1 |
2,2 |
0,1 |
0,1 |
|
8 |
2 |
4,1 |
4,1 |
4,1 |
0,1 |
0,0 |
|
8 |
4 |
4,1 |
4,1 |
2,2 |
0,1 |
0,1 |
|
NOTE: One localized EPDCCH-PRB-set and one distributed EPDCCH-PRB-set – Case 3); |
||||||
for Case 3
is the identity of the localized EPDCCH-PRB-set, 
is the identity of the distributed EPDCCH-PRB-set)If the UE is not configured with a carrier indicator field, then the UE shall monitor one EPDCCH UE-specific search space at each of the aggregation levels given by Tables 9.1.4-1a to 9.1.4-5b on each activated serving cell for which it is configured to monitor EPDCCH.
If a UE is configured for EPDCCH monitoring, and if the UE is configured with a carrier indicator field, then the UE shall monitor one or more EPDCCH UE-specific search spaces at each of the aggregation levels given by Tables 9.1.4-1a to 9.1.4-5b on one or more activated serving cells as configured by higher layer signalling.
A UE configured with the carrier indicator field associated with monitoring EPDCCH on serving cell c shall monitor EPDCCH configured with carrier indicator field and with CRC scrambled by C-RNTI in the EPDCCH UE specific search space of serving cell c.
A UE configured with the carrier indicator field associated with monitoring EPDCCH on the primary cell shall monitor EPDCCH configured with carrier indicator field and with CRC scrambled by SPS C-RNTI or UL-SPS-V-RNTI in the EPDCCH UE specific search space of the primary cell.
A UE is not expected to be configured to monitor EPDCCH with carrier indicator field in an LAA Scell
A UE is not expected to be scheduled with PDSCH starting in the second slot in a subframe in an LAA Scell if the UE is configured to monitor EPDCCH with carrier indicator field corresponding to that LAA Scell in another serving cell
For the serving cell on which EPDCCH is monitored, if the UE is not configured with a carrier indicator field, it shall monitor the EPDCCH UE specific search space for EPDCCH without carrier indicator field, if the UE is configured with a carrier indicator field it shall monitor the EPDCCH UE specific search space for EPDCCH with carrier indicator field.
A UE is not expected to monitor the EPDCCH of a secondary cell if it is configured to monitor EPDCCH with carrier indicator field corresponding to that secondary cell in another serving cell. For the serving cell on which EPDCCH is monitored, the UE shall monitor EPDCCH candidates at least for the same serving cell.
A UE configured to monitor EPDCCH candidates in a given serving cell with a given DCI format size with CIF, and CRC scrambled by C- RNTI, where the EPDCCH candidates may have one or more possible values of CIF for the given DCI format size, shall assume that an EPDCCH candidate with the given DCI format size may be transmitted in the given serving cell in any EPDCCH UE specific search space corresponding to any of the possible values of CIF for the given DCI format size.
For the serving cell on which EPDCCH is monitored, a UE is not required to monitor the EPDCCH in a subframe which is configured by higher layers to be part of a positioning reference signal occasion if the positioning reference signal occasion is only configured within MBSFN subframes and the cyclic prefix length used in subframe #0 is normal cyclic prefix.
A UE may assume the same 
value (described in Clause 6.10.3A.1 of [3]) is used for antenna ports 107,108 while monitoring an EPDCCH candidate associated with either antenna port 107 or antenna port 108.
A UE may assume the same 
value (described in Clause 6.10.3A.1 of [3]) is used for antenna ports 109,110 while monitoring an EPDCCH candidate associated with either antenna port 109 or antenna port 110.
9.1.4.1 EPDCCH starting position
For a given serving cell, if the UE is configured via higher layer signalling to receive PDSCH data transmissions according to transmission modes 1-9,
- if the UE is configured with a higher layer parameter epdcch-StartSymbol-r11,
- the starting OFDM symbol for EPDCCH given by index
is determined from the higher layer parameter,
- the starting OFDM symbol for EPDCCH given by index
- otherwise
- the starting OFDM symbol for EPDCCH given by index
is given by the CFI value in the subframe of the given serving cell when 
, and 
is given by the CFI value+1 in the subframe of the given serving cell when 
- the starting OFDM symbol for EPDCCH given by index
For a given serving cell, if the UE is configured via higher layer signalling to receive PDSCH data transmissions according to transmission mode 10, for each EPDCCH-PRB-set, the starting OFDM symbol for monitoring EPDCCH in subframe 
is determined from the higher layer parameter pdsch-Start-r11 (defined in Clause 9.1.4.3) as follows
- if the value of the parameter pdsch-Start-r11 belongs to {1,2,3,4},
is given by the higher layer parameter pdsch-Start-r11
- otherwise
is given by the CFI value in subframe 
of the given serving cell when 
, and 
is given by the CFI value+1 in subframe 
of the given serving cell when 
- if subframe
is indicated by the higher layer parameter mbsfn-SubframeConfigList-r11 (defined in Clause 9.1.4.3), or if subframe 
is subframe 1 or 6 for frame structure type 2,
,
- otherwise
.
If a serving cell is a LAA Scell, and if the higher layer parameter subframeStartPosition for the Scell indicates ‘s07’
- for monitoring EPDCCH candidates starting in the first slot of the subframe, the starting OFDM symbol for EPDCCH is given by index
in the first slot in a subframe; - for monitoring EPDCCH candidates starting in the second slot of the subframe, the starting OFDM symbol for EPDCCH is given by index
in the second slot in a subframe;
otherwise
- the starting OFDM symbol for EPDCCH is given by index
in the first slot in a subframe.
9.1.4.2 Antenna ports quasi co-location for EPDCCH
For a given serving cell, if the UE is configured via higher layer signalling to receive PDSCH data transmissions according to transmission modes 1-9, and if the UE is configured to monitor EPDCCH,
– the UE may assume the antenna ports 0 – 3, 107 – 110 of the serving cell are quasi co-located (as defined in [3]) with respect to Doppler shift, Doppler spread, average delay, and delay spread.
For a given serving cell, if the UE is configured via higher layer signalling to receive PDSCH data transmissions according to transmission mode 10, and if the UE is configured to monitor EPDCCH, for each EPDCCH-PRB-set,
– if the UE is configured by higher layers to decode PDSCH according to quasi co-location Type-A as described in Clause 7.1.10
– the UE may assume the antenna ports 0 – 3, 107 – 110 of the serving cell are quasi co-located (as defined in [3]) with respect to Doppler shift, Doppler spread, average delay, and delay spread.
– if the UE is configured by higher layers to decode PDSCH according to quasi co-location Type-B or type C as described in Clause 7.1.10
– the UE may assume antenna ports 15 – 22 corresponding to the higher layer parameter qcl-CSI-RS-ConfigNZPId-r11 (defined in Clause 9.1.4.3) and antenna ports 107-110 are quasi co-located (as defined in [3]) with respect to Doppler shift, Doppler spread, average delay, and delay spread.
9.1.4.3 Resource mapping parameters for EPDCCH
For a given serving cell, if the UE is configured via higher layer signalling to receive PDSCH data transmissions according to transmission mode 10, and if the UE is configured to monitor EPDCCH, for each EPDCCH-PRB-set, the UE shall use the parameter set indicated by the higher layer parameter re-MappingQCL-ConfigId-r11 for determining the EPDCCH RE mapping (defined in Clause 6.8A.5 of [3]) and EPDCCH antenna port quasi co-location. The following parameters for determining EPDCCH RE mapping (as described in Clause 6.8A.5 of [3]) and EPDCCH antenna port quasi co-location are included in the parameter set:
– crs-PortsCount-r11.
– crs-FreqShift-r11.
– mbsfn-SubframeConfigList-r11.
– csi-RS-ConfigZPId-r11.
– pdsch-Start-r11.
– qcl-CSI-RS-ConfigNZPId-r11.
– csi-RS-ConfigZPId2-r12 if the UE is configured with CSI subframe sets 
and 
by the higher layer parameter csi-SubframePatternConfig-r12 for the serving cell or the UE is configured with higher layer parameter eMIMO-Type for TDD serving cell.
9.1.4.4 PRB-pair indication for EPDCCH
For BL/CE UEs and USS, following is applied in the rest of this Clause.
– 
is used in place of 
.
– If 
=2+4, PRB-pairs of the 2 PRB set is obtained using resourceBlockAssignment-r11 and the procedure described in the rest of this Clause. PRB-pairs of the 4 PRB set is the remaining 4 PRB-pairs in PRB-pairs in MPDCCH-PRB-set 
. If 
=2, PRB-pairs of the 2 PRB set is obtained using resourceBlockAssignment-r11 and the procedure described in the rest of this Clause. If 
=4, PRB-pairs of the 4 PRB set is obtained using resourceBlockAssignment-r11 and the procedure described in the rest of this Clause.
– 
is set to 6.
For a given serving cell, for each EPDCCH-PRB-pair set/MPDCCH-PRB-pair set 
, the UE is configured with a higher layer parameter resourceBlockAssignment-r11 indicating a combinatorial index 
corresponding to the PRB index 
, (
) and given by equation 
, where 
is the number of PRB pairs associated with the downlink bandwidth, 
is the number of PRB-pairs constituting EPDCCH-PRB-set/MPDCCH-PRB-pair set 
, and is configured by the higher layer parameter numberPRBPairs-r11, and 
is the extended binomial coefficient, resulting in unique label 
.