RECONFIGURATION CONTROL CHANNEL RESOURCE MAPPING COLLISION AVOIDANCE
A device includes a transceiver to receive, from a base station, a physical downlink shared channel (PDSCH) transmission and processing circuitry to classify downlink (DL) subframe types for a set of DL subframes associated with a first uplink (UL) subframe for transmission of a hybrid automatic report request acknowledgment (HARQ-ACK) and perform physical uplink control channel (PUCCH) resources mapping based on the classified DL subframe Types for an acknowledgement transmission associated with PDSCH transmission reception.
1 . A device comprising:
a transceiver to receive, from a base station, a physical downlink shared channel (PDSCH) transmission; and
processing circuitry to:
classify downlink (DL) subframe types for a set of DL subframes associated with a first uplink (UL) subframe for transmission of a hybrid automatic report request acknowledgment (HARQ-ACK); and
perform physical uplink control channel (PUCCH) resources mapping based on the classified DL subframe Types for an acknowledgement transmission associated with PDSCH transmission reception.
2 . The device of claim 1 wherein the DL subframe types comprise:
Type 1 DL subframes that are constructed by DL subframes that are associated with a first uplink (UL) subframe for transmission of HARQ-ACK according to a time division duplex (TDD) UL/DL configuration indicated in a system information block Type 1 (SIB1) message; and
Type 2 DL subframes that are constructed by:
firstly identifying DL subframes that are associated with the first UL subframe for transmission of HARQ-ACK according to a higher layer configured DL-reference UL/DL configuration; and
if the Type 1 DL subframes are overlapped with the Type 2 DL subframes, the overlapping subframes between Type 1 and Type 2 DL subframes are further removed from the Type 2 DL subframes.
3 . The device of claim 1 , wherein the processing circuitry further performs PUCCH resource mapping for PDSCH transmission indicated via Physical Downlink Control Channel (PDCCH) on a Type 1 DL subframe based on:
n PUCCH,j (1) =( M 1 <j− 1)· N c +j·N c+1 +n CCE,j +N PUCCH (1)
where N PUCCH (1) is a PUCCH resource offset associated with legacy PDCCH that is configured by higher layer for PUCCH resource mapping of Type 1 DL subframes, c is selected from {0, 1, 2, 3} such that N c ≦n CCE,j <N c+1 , N c =max{0,└[N RB DL ·(N sc RB ·c−4)]/36┘}, N RB DL refers to Downlink bandwidth configuration and N sc RB refers to resource block size in the frequency domain that is expressed as a number of subcarriers, n CCE,j is the number of the first control channel element (CCE) used for transmission of the corresponding PDCCH in Type 1 DL subframe j, and j(0≦j<M 1 ) is the index of the Type 1 DL subframe, and M 1 is the number of Type 1 DL subframes.
4 . The device of claim 3 , wherein the processing circuitry further performs PUCCH resource mapping for PDSCH transmission indicated via PDCCH on a Type 1 DL subframe based on:
N PUCCH,j (1) =( M 1 −j− 1)· N c +j·N c+1 +n CCE,j +N PUCCH (1) +Δ ARO
Where j(0≦j<M 1 ) is the index of the Type 1 DL subframe, and Δ ARO refers to HARQ-ACK resource offset value that is selected from predefined values based on 2-bits HARQ-ACK resource offset field in a downlink control information (DCI) format depending on the number of Type 1 DL subframes associated with the first UL subframe for HARQ-ACK transmission.
5 . The device of claim 4 , wherein the processing circuitry further performs determining the HARQ-ACK offset Δ ARO for a Type 1 DL subframe based on 2-bits HARQ-ACK resource offset field in the DCI format of the corresponding PDCCH depending on the number of Type 1 DL subframes associated with the first UL subframe for HARQ-ACK transmission:
selecting a Δ ARO value out of {0, −1, −2, 2} if the number of Type 1 DL subframes is one; and
selecting a value out of {0, Δ1−1, Δ 2 −2, 2} if the number of Type 1 DL subframes is more than one, where Δ1 or Δ 2 could be one of {0, −(M 1 −j−1)·N c −j·N c+1 , −M 1 ·(N c −N c−1 ), −j·(N c+1 −N c ), −(N c+1 −N c ), −M 1 ·N c }, and j(0≦j<M 1 ) is the index of the Type 1 DL subframe, and M 1 is the number of Type 1 DL subframes, and c is selected from {0, 1, 2, 3} such that N c ≦n CCE,j <N c+1 , N c =max{0,└[N RB DL ·(N sc RB ·c−4)]/36┘}.
6 . The device of claim 1 , wherein the processing circuitry further performs PUCCH resource mapping for PDSCH transmission indicated via Physical Downlink Control Channel (PDCCH) on a Type 2 DL subframe based on higher-layer signaling or based on:
n
PUCCH
,
l
(
1
)
=
(
M
2
-
l
-
1
)
·
N
c
+
l
·
N
c
+
1
+
n
CCE
,
l
+
N
PUCCH
(
2
)
or
n
PUCCH
,
l
(
1
)
=
l
·
N
4
+
n
CCE
,
l
+
N
PUCCH
(
2
)
or
n
PUCCH
,
l
(
1
)
=
∑
c
=
0
l
-
1
∑
m
=
1
N
CFI
,
c
N
m
+
n
CCE
,
l
+
N
PUCCH
(
2
)
where N PUCCH (2) is PUCCH resource offset associated with PDSCH on Type 2 DL subframes for PUCCH resource mapping, and c is selected from {0, 1, 2, 3} such that N c ≦n CCE,l <N c+1 , N c =max{0,└[N RB DL ·(N sc RB ·c−4)]/36┘}, N RB DL refers to downlink bandwidth configuration and N sc RB refers to resource block size in the frequency domain that is expressed as a number of subcarriers. n CCE,l is the number of the first channel control element (CCE) used for transmission of the corresponding PDCCH in Type 2 DL subframe l, and l(0≦l<M 2 ) is the index of a Type 2 DL subframe and M 2 is the number of Type 2 DL subframes, and N CFI,c is detected Control Formal Indicator (CFI) value carried on Physical Control Format Indicator Channel (PCFICH) channel in Type 2 subframe c.
7 . The device of claim 6 wherein the PUCCH resource offset N PUCCH (2) are configured by higher layer signal in a user equipment specific manner or a Cell-specific manner, or determined based on:
N PUCCH (2) =M 1 ·N 4
where M 1 is a number of Type 1 DL subframes associated with the first UL subframe for HARQ-ACK transmission, and N 4 refers to PUCCH resources reserved for a Type 1 DL subframe and is calculated according to N c =max{0,└[N RB DL ·(N sc RB ·c−4)]/36┘}.
8 . The device of claim 6 , wherein the processing circuitry further performs PUCCH resource mapping for PDSCH transmission on a Type 2 DL subframe via PDCCH based on:
n
PUCCH
,
l
(
1
)
=
(
M
2
-
l
-
1
)
·
N
c
+
l
·
N
c
+
1
+
n
CCE
,
l
+
N
PUCCH
(
2
)
+
Δ
ARO
or
n
PUCCH
,
l
(
1
)
=
l
·
N
4
+
n
CCE
,
l
+
N
PUCCH
(
2
)
+
Δ
ARO
or
n
PUCCH
,
l
(
1
)
=
∑
c
=
0
l
-
1
∑
m
=
1
N
CFI
,
c
N
m
+
n
CCE
,
l
+
N
PUCCH
(
2
)
+
Δ
ARO
where l(0≦l<M 2 ) is the index of the Type 2 DL subframe, and Δ ARO refers to HARQ-ACK resource offset value that is selected based on 2-bits HARQ-ACK resource offset field in a downlink control information (DCI) format depending on the number of Type 2 DL subframes associated with the first UL subframe for HARQ-ACK transmission.
9 . The device of claim 8 , wherein the processing circuitry further performs determining the HARQ-ACK offset for a Type 2 DL subframe based on 2-bits HARQ-ACK resource offset field in the DCI format of the corresponding PDCCH depending on the number of Type 2 DL subframes associated with the first UL subframe for HARQ-ACK transmission:
selecting a Δ ARO value out of {0, −1, −2, 2} if the number of Type 2 DL subframes is one.
selecting a Δ ARO value out of {0, Δ 1 −1, Δ 2 −2, 2} if the number of Type 2 DL subframes is more than one, where Δ 1 or Δ 2 could be one value of
{
0
,
-
(
M
2
-
l
-
1
)
·
N
c
-
l
·
N
c
+
1
,
-
M
2
·
(
N
c
-
N
c
-
1
)
,
-
l
·
(
N
c
+
1
-
N
c
)
,
-
(
N
c
+
1
-
N
c
)
,
-
M
2
·
N
c
,
-
(
N
PUCCH
(
2
)
-
N
PUCCH
(
1
)
)
,
M
1
·
N
4
,
∑
c
=
0
M
1
-
1
∑
m
=
1
N
CFI
,
c
N
m
}
,
and l(0≦l<M 2 ) is the index of the Type 2 DL subframe, and M 1 is the number of Type 1 DL subframes associated with the same first UL subframe for HARQ-ACK transmission and M 2 is the number of Type 2 DL subframes, and N PUCCH (1) and N PUCCH (2) is PUCCH resource offset associated with PDSCH on Type 1 DL subframes and Type 2 DL subframes respectively for PUCCH resource mapping, and c is selected from {0, 1, 2, 3} such that is selected from {0, 1, 2, 3} such that N c ≦n CCE,l <N c+1 , N c =max{0,└[N RB DL ·(N sc RB ·c−4)]/36┘}, and N CFI,c is detected Control Formal Indicator (CFI) value carried on Physical Control Format Indicator Channel (PCFICH) channel in Type 2 subframe c.
10 . The device of claim 1 , wherein the processing circuitry further performs PUCCH resource mapping for PDSCH transmission indicated via enhanced physical downlink control channel (EPDCCH) or a EPDCCH indicating downlink semi persistent scheduling (SPS) release in a Type 1 or Type 2 sub-frame, the user equipment (UE) shall use:
n
PUCCH
,
i
(
1
)
=
n
ECCE
,
q
+
∑
i
1
=
0
i
-
1
N
ECCE
,
q
,
n
-
k
i
1
+
Δ
ARO
+
N
PUCCH
,
q
(
e
1
)
if EPDCCH-physical resource block (PRB)-set q is configured for distributed transmission, or
n
PUCCH
,
i
(
1
)
=
⌊
n
ECCE
,
q
N
RB
ECCE
,
q
⌋
·
N
RB
ECCE
,
q
+
∑
i
1
=
0
i
-
1
N
ECCE
,
q
,
n
-
k
i
1
+
n
′
+
Δ
ARO
+
N
PUCCH
,
q
(
e
1
)
if EPDCCH-PRB-set q is configured for localised transmission where n ECCE,q is the number of the first ECCE (i.e. lowest ECCE index used to construct the EPDCCH) used for transmission of a corresponding downlink control information (DCI) assignment in EPDCCH-PRB-set q in subframe n−k i , N PUCCH,q (e1) for EPDCCH-PRB-set q is configured by the higher layer parameter pucch-ResourceStartOffset-r11, N RB ECCE,q for EPDCCH-PRB-set q in subframe n−k i is given, and n′ is determined from the antenna port used for EPDCCH transmission in subframe n−k i , and Δ ARO is the HARQ-ACK resource offset.
11 . The device of claim 10 , wherein the processing circuitry further performs PUCCH resource mapping for PDSCH transmission indicated via EPDCCH or EPDCCH indicating downlink SPS release in a Type 1 or Type 2 sub-frame, the user equipment (UE) shall use:
n
PUCCH
,
i
(
1
)
=
⌊
n
ECCE
,
q
L
i
⌋
+
∑
i
1
=
0
i
-
1
(
N
ECCE
,
q
,
n
-
k
i
1
L
i
1
)
+
Δ
ARO
+
N
PUCCH
,
q
(
e
1
)
or
n
PUCCH
,
i
(
1
)
=
⌊
n
ECCE
,
q
L
i
·
N
RB
ECCE
,
q
⌋
·
N
RB
ECCE
,
q
+
∑
i
1
=
0
i
-
1
(
N
ECCE
,
q
,
n
-
k
i
1
L
i
1
)
+
n
′
+
Δ
ARO
+
N
PUCCH
,
q
(
e
1
)
where L i denotes the minimum supportable aggregation level in subframe i.
12 . A method comprising:
receiving from a base station via a transceiver, a physical downlink shared channel (PDSCH) transmission;
classifying, via processing circuitry, downlink (DL) subframe types for a set of DL subframes associated with a first uplink (UL) subframe for transmission of a hybrid automatic report request acknowledgment (HARQ-ACK); and
performing physical uplink control channel (PUCCH) resources mapping based on the classified DL subframe Types for an acknowledgement transmission associated with PDSCH transmission reception.
13 . The method of claim 12 wherein the DL subframe types comprise:
Type 1 DL subframes that are constructed by DL subframes that are associated with a first uplink (UL) subframe for transmission of HARQ-ACK according to a time division duplex (TDD) UL/DL configuration indicated in a system information block Type 1 (SIB1) message; and
Type 2 DL subframes that are constructed by:
firstly identifying DL subframes that are associated with the first UL subframe for transmission of HARQ-ACK according to a higher layer configured DL-reference UL/DL configuration; and
if the Type 1 DL subframes are overlapped with the Type 2 DL subframes, the overlapping subframes between Type 1 and Type 2 DL subframes are further removed from the Type 2 DL subframes.
14 . The method of claim 12 , further comprising performing PUCCH resource mapping for PDSCH transmission indicated via Physical Downlink Control Channel (PDCCH) on a Type 1 DL subframe based on:
n PUCCH,j (1) =( M 1 −j− 1)· N c +j·N c+1 +n CCE,j +N PUCCH (1)
where N PUCCH (1) is a PUCCH resource offset associated with legacy PDCCH that is configured by higher layer for PUCCH resource mapping of Type 1 DL subframes, c is selected from {0, 1, 2, 3} such that N c ≦n CCE,j <N c+1 , N c =max{0,└[N RB DL ·(N sc RB ·c−4)]/36┘}, N RB DL refers to downlink bandwidth configuration and N sc RB refers to resource block size in the frequency domain that is expressed as a number of subcarriers, n CCE,j is the number of the first control channel element (CCE) used for transmission of the corresponding PDCCH in Type 1 DL subframe j, and j(0≦j<M 1 ) is the index of the Type 1 DL subframe, and M 1 is the number of Type 1 DL subframes.
15 . The method of claim 14 , further comprising performing PUCCH resource mapping for PDSCH transmission indicated via PDCCH on a Type 1 DL subframe based on:
n PUCCH,j (1) =( M 1 −j− 1)· N c +j·N c+1 +n CCE,j +N PUCCH (1) +Δ ARO
where j(0≦j<M 1 ) is the index of the Type 1 DL subframe, and Δ ARO refers to HARQ-ACK resource offset value that is selected from predefined values based on 2-bits HARQ-ACK resource offset field in a downlink control information (DCI) format depending on the number of Type 1 DL subframes associated with the first UL subframe for HARQ-ACK transmission.
16 . The method of claim 15 , further comprising determining the HARQ-ACK offset Δ ARO for a Type 1 DL subframe based on 2-bits HARQ-ACK resource offset field in the DCI format of the corresponding PDCCH depending on the number of Type 1 DL subframes associated with the first UL subframe for HARQ-ACK transmission:
selecting a Δ ARO value out of {0, −1, −2, 2} if the number of Type 1 DL subframes is one; and
selecting a value out of {0, Δ 1 −1, Δ 2 −2, 2} if the number of Type 1 DL subframes is more than one, where Δ 1 or Δ 2 could be one of {0, −(M 1 −j−1)·N c −j·N c+1 , −M 1 ·(N c −N c−1 ), −j·(N c+1 −N c ), −(N c+1 −N c ), −M 1 ·N c }, and j(0≦j<M 1 ) is the index of the Type 1 DL subframe, and M 1 is the number of Type 1 DL subframes, and c is selected from {0, 1, 2, 3} such that N c ≦n CCE,j <N c+1 , N c =max{0,└[N RB DL ·(N sc RB ·c−4)]/36┘}.
17 . The method of claim 12 , further comprising performing PUCCH resource mapping for PDSCH transmission indicated via Physical Downlink Control Channel (PDCCH) on a Type 2 DL subframe based on higher-layer signaling or based on:
n
PUCCH
,
l
(
1
)
=
(
M
2
-
l
-
1
)
·
N
c
+
l
·
N
c
+
1
+
n
CCE
,
l
+
N
PUCCH
(
2
)
or
n
PUCCH
,
l
(
1
)
=
l
·
N
4
+
n
CCE
,
l
+
N
PUCCH
(
2
)
or
n
PUCCH
,
l
(
1
)
=
∑
c
=
0
l
-
1
∑
m
=
1
N
CFI
,
c
N
m
+
n
CCE
,
l
+
N
PUCCH
(
2
)
where N PUCCH (2) is PUCCH resource offset associated with PDSCH on Type 2 DL subframes for PUCCH resource mapping, and c is selected from {0, 1, 2, 3} such that N c ≦n CCE,l <N c+1 , N c =max{0,└[N RB DL ·(N sc RB ·c−4)]/36┘}, N RB DL refers to downlink bandwidth configuration and N sc RB refers to resource block size in the frequency domain that is expressed as a number of subcarriers. n CCE,l is the number of the first channel control element (CCE) used for transmission of the corresponding PDCCH in Type 2 DL subframe l, and l(0≦l<M 2 ) is the index of a Type 2 DL subframe and M 2 is the number of Type 2 DL subframes, and N CFI,c is detected Control Formal Indicator (CFI) value carried on Physical Control Format Indicator Channel (PCFICH) channel in Type 2 subframe c.
18 . The method of claim 17 wherein the PUCCH resource offset N PUCCH (2) are configured by higher layer signal in a user equipment specific manner or a Cell-specific manner, or determined based on:
N PUCCH (2) =M 1 ·N 4
where M 1 is a number of Type 1 DL subframes associated with the first UL subframe for HARQ-ACK transmission, and N 4 refers to PUCCH resources reserved for a Type 1 DL subframe and is calculated according to N c =max{0,└[N RB DL ·(N sc RB ·c−4)]/36┘}.
19 . The method of claim 17 , further comprising performing PUCCH resource mapping for PDSCH transmission on a Type 2 DL subframe via PDCCH based on:
n
PUCCH
,
l
(
1
)
=
(
M
2
-
l
-
1
)
·
N
c
+
l
·
N
c
+
1
+
n
CCE
,
l
+
N
PUCCH
(
2
)
+
Δ
ARO
or
n
PUCCH
,
l
(
1
)
=
l
·
N
4
+
n
CCE
,
l
+
N
PUCCH
(
2
)
+
Δ
ARO
or
n
PUCCH
,
l
(
1
)
=
∑
c
=
0
l
-
1
∑
m
=
1
N
CFI
,
c
N
m
+
n
CCE
,
l
+
N
PUCCH
(
2
)
+
Δ
ARO
where l(0<l<M 2 ) is the index of the Type 2 DL subframe, and Δ ARO refers to HARQ-ACK resource offset value that is selected based on 2-bits HARQ-ACK resource offset field in a downlink control information (DCI) format depending on the number of Type 2 DL subframes associated with the first UL subframe for HARQ-ACK transmission.
20 . The method of claim 19 , further comprising determining the HARQ-ACK offset for a Type 2 DL subframe based on 2-bits HARQ-ACK resource offset field in the DCI format of the corresponding PDCCH depending on the number of Type 2 DL subframes associated with the first UL subframe for HARQ-ACK transmission:
selecting a Δ ARO value out of {0, −1, −2, 2} if the number of Type 2 DL subframes is one.
selecting a Δ ARO value out of {0, Δ 1 −1, Δ 2 −2, 2} if the number of Type 2 DL subframes is more than one, where Δ 1 or Δ 2 could be one value of
{
0
,
-
(
M
2
-
l
-
1
)
·
N
c
-
l
·
N
c
+
1
,
-
M
2
·
(
N
c
-
N
c
-
1
)
,
-
l
·
(
N
c
+
1
-
N
c
)
,
-
(
N
c
+
1
-
N
c
)
,
-
M
2
·
N
c
,
-
(
N
PUCCH
(
2
)
-
N
PUCCH
(
1
)
)
,
M
1
·
N
4
,
∑
c
=
0
M
1
-
1
∑
m
=
1
N
CFI
,
c
N
m
}
,
and l(0≦l<M 2 ) is the index of the Type 2 DL subframe, and M 1 is the number of Type 1 DL subframes associated with the same first UL subframe for HARQ-ACK transmission and M 2 is the number of Type 2 DL subframes, and N PUCCH (1) and N PUCCH (2) is PUCCH resource offset associated with PDSCH on Type 1 DL subframes and Type 2 DL subframes respectively for PUCCH resource mapping, and c is selected from {0, 1, 2, 3} such that is selected from {0, 1, 2, 3} such that N c ≦n CCE,l <N c+1 , N c =max{0,└[N RB DL ·(N sc RB ·c−4)]/36┘}, and N CFI,c is detected Control Formal Indicator (CFI) value carried on Physical Control Format Indicator Channel (PCFICH) channel in Type 2 subframe c.
21 . The method of claim 12 , further comprising performing PUCCH resource mapping for PDSCH transmission indicated via enhanced physical downlink control channel (EPDCCH) or a EPDCCH indicating downlink semi persistent scheduling (SPS) release in a Type 1 or Type 2 sub-frame, the user equipment (UE) shall use:
n
PUCCH
,
i
(
1
)
=
n
ECCE
,
q
+
∑
i
1
=
0
i
-
1
N
ECCE
,
q
,
n
-
k
i
1
+
Δ
ARO
+
N
PUCCH
,
q
(
e
1
)
if EPDCCH-physical resource block (PRB)-set q is configured for distributed transmission, or
n
PUCCH
,
i
(
1
)
=
⌊
n
ECCE
,
q
N
RB
ECCE
,
q
⌋
·
N
RB
ECCE
,
q
+
∑
i
1
=
0
i
-
1
N
ECCE
,
q
,
n
-
k
i
1
+
n
′
+
Δ
ARO
+
N
PUCCH
,
q
(
e
1
)
if EPDCCH-PRB-set q is configured for localised transmission where n ECCE,q is the number of the first ECCE (i.e. lowest ECCE index used to construct the EPDCCH) used for transmission of a corresponding downlink control information (DCI) assignment in EPDCCH-PRB-set q in subframe n−k i , N PUCCH,q (e1) for EPDCCH-PRB-set q is configured by the higher layer parameter pucch-ResourceStartOffset-r11, N RB ECCE,q for EPDCCH-PRB-set q in subframe n−k i is given, and n′ is determined from the antenna port used for EPDCCH transmission in subframe n−k i , and Δ ARO is the HARQ-ACK resource offset.
22 . The method of claim 21 , further comprising performing PUCCH resource mapping for PDSCH transmission indicated via EPDCCH or EPDCCH indicating downlink SPS release in a Type 1 or Type 2 sub-frame, the user equipment (UE) shall use:
n
PUCCH
,
i
(
1
)
=
⌊
n
ECCE
,
q
L
i
⌋
+
∑
i
1
=
0
i
-
1
(
N
ECCE
,
q
,
n
-
k
i
1
L
i
1
)
+
Δ
ARO
+
N
PUCCH
,
q
(
e
1
)
or
n
PUCCH
,
i
(
1
)
=
⌊
n
ECCE
,
q
L
i
·
N
RB
ECCE
,
q
⌋
·
N
RB
ECCE
,
q
+
∑
i
1
=
0
i
-
1
(
N
ECCE
,
q
,
n
-
k
i
1
L
i
1
)
+
n
′
+
Δ
ARO
+
N
PUCCH
,
q
(
e
1
)
where L i denotes the minimum supportable aggregation level in subframe i.
23 . A machine readable storage device having instructions to cause a machine to:
receive from a base station via a transceiver, a physical downlink shared channel (PDSCH) transmission;
classify, via processing circuitry, downlink (DL) subframe types for a set of DL subframes associated with a first uplink (UL) subframe for transmission of a hybrid automatic report request acknowledgment (HARQ-ACK); and
perform physical uplink control channel (PUCCH) resources mapping based on the classified DL subframe Types for an acknowledgement transmission associated with PDSCH transmission reception.
24 . The machine readable storage device of claim 23 wherein the DL subframe types comprise:
Type 1 DL subframes that are constructed by DL subframes that are associated with a first uplink (UL) subframe for transmission of HARQ-ACK according to a time division duplex (TDD) UL/DL configuration indicated in a system information block Type 1 (SIB1) message; and
Type 2 DL subframes that are constructed by:
firstly identifying DL subframes that are associated with the first UL subframe for transmission of HARQ-ACK according to a higher layer configured DL-reference UL/DL configuration; and
if the Type 1 DL subframes are overlapped with the Type 2 DL subframes, the overlapping subframes between Type 1 and Type 2 DL subframes are further removed from the Type 2 DL subframes.