Devices and methods for HARQ-ACK feedback scheme on PUSCH in wireless communication systems
Devices and methods of reducing overall Hybrid Automatic Repeat Request-Acknowledgment (HARQ-ACK) of user equipment (UE) using a large amount of carrier aggregation are generally described. The UE may receive a subframe from an enhanced NodeB (eNB). The subframe may contain a physical downlink control channel (PDCCH) formed in accordance with a Downlink Control information (DCI) format. The DCI format may comprise a Downlink Assignment Index (DAI) for Time Division Duplexed (TDD) and Frequency Division Duplexed (FDD) operation. The UE may determine, dependent on the DAI, a number and ordering of Hybrid Automatic Repeat Request-Acknowledgment (HARQ-ACK) bits to be transmitted on a Physical Uplink Shared Channel (PUSCH) and subsequently transmit the HARQ-ACK bits.
1. An apparatus comprising:
at least one processor configured to cause a user equipment (UE), the UE configurable for Hybrid Automatic Repeat Request-Acknowledgment (HARQ-ACK) reporting, to:
determine (HARQ-ACK) feedback for transmission in a Physical Uplink Shared Channel (PUSCH), the HARQ-ACK feedback comprising a bit sequence of HARQ-ACK bits, a number of the HARQ-ACK bits and the bit sequence of the HARQ-ACK bits dependent on a value of a Downlink Assignment Index (DAI) of a Downlink Control Information (DCI) of a Physical Downlink Control Channel (PDCCH) received from a serving cell; and
generate the HARQ ACK bits for transmission on the PUSCH in accordance with the bit sequence,
wherein the number of HARQ-ACK bits is O ACK and is dependent on a number, across serving cells, of received Physical Downlink Shared Channels (PDSCHs) and PDCCHs indicating a downlink semi-persistent scheduling (SPS) release,
DCI format 0 or DCI format 4 uses a 2 bit DAI,
DCI format 1/1A/1B/2/2A/2B/2C/2D uses a 0, 2, or 4 bit DAI that is configured by higher layers,
the 4 bit DAI comprises a 2-bit counter DAI and a 2-bit total DAI, in which:
the 2-bit counter DAI denotes an accumulative number of serving cells with PDSCH transmissions associated with a PDCCH or Enhanced Physical Downlink Control Channel (EPDCCH) and a serving cell with a PDCCH or EPDCCH indicating the downlink SPS release, up to the present serving cell in increasing order of serving cell index, and
the 2-bit total DAI in which the 2-bit total DAI denotes a total number of serving cells with PDSCH transmissions associated with a PDCCH or EPDCCH and a serving cell with a PDCCH or EPDDCH indicating the downlink SPS release, and
a value of the counter DAI, V c−DAI,c DL and of the total DAI, V T−DAI DL for FDD is:
Number of serving cells with PDSCH
transmission associated with
DAI
PDCCH/EPDCCH and serving cell
MSB,
with PDCCH/EPDCCH
LSD
or
indicating DL SPS release
0,0
1
1 or 5 or 9 or 13 or 17 or 21 or 25 or 29
0,1
2
2 or 6 or 10 or 14 or 18 or 22 or 26 or 30
1,0
3
3 or 7 or 11 or 15 or 19 or 23 or 27 or 31
1,1
4
0 or 4 or 8 or 12 or 16 or 20 or 24 or 28 or 32.
2. The apparatus of claim 1 , wherein:
for Frequency Division Duplexed (FDD) transmissions, a particular PDCCH is in subframe n-4 and a PUSCH associated with the particular PDCCH is in subframe n.
3. The apparatus of claim 1 , wherein:
for Time Division Duplexed (TDD) transmissions, a particular PUSCH is in the subframe n and PDCCHs associated with the particular PUSCH are in subframes n-k, where k∈K and K is given by:
UL-DL
Subframe n
Configuration
0
1
2
3
4
5
6
7
8
9
0
—
—
6
—
4
—
—
6
—
4
1
—
—
7, 6
4
—
—
—
7, 6
4
—
2
—
—
8, 7, 4, 6
—
—
—
—
8, 7, 4, 6
—
—
3
—
—
7, 6, 11
6, 5
5, 4
—
—
—
—
—
4
—
—
12, 8, 7, 11
6, 5, 4, 7
—
—
—
—
—
—
5
—
—
13, 12, 9, 8, 7, 5, 4, 11, 6
—
—
—
—
—
—
—
6
—
—
7
7
5
—
—
7
7
—.
4. The apparatus of claim 1 , wherein:
the number of HARQ-ACK bits is dependent on the number of received Physical Downlink Shared Channels (PDSCHs) and PDCCHs indicating the downlink SPS release concatenated across serving cells in a single subframe for Frequency Division Duplexed (FDD) and in multiple subframes for Time Division Duplexed (TDD).
5. The apparatus of claim 1 , wherein:
the number of HARQ-ACK bits is O ACK , and
O
ACK
=
W
DAI
UL
+
N
⌈
U
-
W
DAI
UL
N
⌉
,
where:
[x] is a ceiling function to obtain a smallest integer not less than x,
U indicates a total number of received Physical Downlink Shared Channels (PDSCHs) and PDCCHs indicating a downlink semi-persistent scheduling (SPS) release in a single previous subframe across all serving cells,
W DAI UL is a detected value of the DAI according to a predefined table, and
N depends on the bit number of the DAI.
6. The apparatus of claim 5 , wherein the at
least one processor is further configured to cause the UE to:
generate a number of HARQ-ACK bits in a particular PUSCH with spatial HARQ-ACK bundling across multiple codewords within a downlink subframe by a logical AND operation.
7. The apparatus of claim 6 , wherein:
a spatially bundled HARQ-ACK bit for a particular PDSCH with a corresponding PDCCH or for a particular PDCCH indicating a downlink SPS release in subframe n-4 is associated with O ACK where B(k) is derived based on a value of DAI V DL in a DCI format to schedule a PDSCH detected in subframe n-4 in the k-th serving cell based on a predefined table depending on a number of bits of a third DAI field in the DCI format,
B ( k )= V DAI,k DL +N [ U k −V DAI,k DL )/ N ]
where:
U k denotes a total number of received PDSCHs and PDCCH indicating a downlink SPS release detected by the UE in subframe n-4 cross all serving cells, and
N=4, 8 or 16 corresponding to a 2-bit, 3-bit and 4-bit DAI respectively.
8. An apparatus comprising:
at least one processor configured to cause a base station (BS) to:
generate, for transmission to a user equipment (UE), a Downlink Control Information (DCI) of a Physical Downlink Control Channel (PDCCH) and a Physical Downlink Shared Channel (PDSCH) indicating a downlink semi-persistent scheduling (SPS) release in different serving cells for Frequency Division Duplexed (FDD) and in a multiple subframes of a particular serving cell for Time Division Duplexed (TDD) the DCI comprising one of a plurality of formats and a Downlink Assignment Index (DAI); and
determine Hybrid Automatic Repeat Request-Acknowledgment (HARQ-ACK) feedback received from the UE, the HARQACK feedback comprising a bit sequence of HARQ-ACK bits, a number of the HARQ-ACK bits and the bit sequence of the HARQ-ACK bits dependent on a value of the DAI,
wherein the number of HARQ-ACK bits in a present subframe is O ACK and is dependent on a total number, across all serving cells in a single subframe for FDD and in multiple subframes for TDD, of PDSCHs and PDCCHs indicating the downlink SPS release,
a number of bits of the DAI is dependent on the DCI format,
DCI format 0 or DCI format 4 uses a 2 bit DAI,
DCI format 1/1A/1B/2/2A/2B/2C/2D uses a 0, 2, or 4 bit DAI that is configured by higher layers,
the 4 bit DAI comprises a 2-bit counter DAI and a 2-bit total DAI, in which:
the 2-bit counter DAI denotes an accumulative number of serving cells with PDSCH transmissions associated with a PDCCH or Enhanced Physical Downlink Control Channel (EPDCCH) and a serving cell with a PDCCH or EPDCCH indicating the downlink SPS release, up to the present serving cell in increasing order of serving cell index, and
the 2-bit total DAI in which the 2-bit total DAI denotes a total number of serving cells with PDSCH transmissions associated with a PDCCH or EPDCCH and a serving cell with a PDCCH or EPDCCH indicating the downlink SPS release, and
a value of the counter DAI, V c−DAI,c DL and of the total DAI, V T−DAI DL for FDD is:
Number of serving cells with PDSCH
DAI
V C-DAI,c DL
transmission associated with
MSB,
or
PDCCH/EPDCCH and serving cell with
LSB
V T-DAI DL
PDCCH/EPDCCH Indicating DL SPS release
0, 0
1
1 or 5 or 9 or 13 or 17 or 21 or 25 or 29
0, 1
2
2 or 6 or 10 or 14 or 18 or 22 or 26 or 30
1, 0
3
3 or 7 or 11 or 15 or 19 or 23 or 27 or 31
1, 1
4
0 or 4 or 8 or 12 or 16 or 20 or 24 or 28 or 3 2.
9. The apparatus of claim 8 , wherein:
for Frequency Division Duplexed (FDD) transmissions, a particular PDCCH is in subframe n-4 and a PUSCH associated with the particular PDCCH is in subframe n.
10. The apparatus of claim 8 , wherein:
for Time Division Duplexed (TDD) transmissions, a particular PUSCH is in the subframe n and PDCCHs associated with the particular PUSCH are in subframes n-k, where k∈K and K is given by:
UL-DL
Config-
Subframe n
uration
0
1
2
3
4
5
6
7
8
9
0
—
—
6
—
4
—
—
6
—
4
1
—
—
7, 6
4
—
—
—
7, 6
4
—
2
—
—
8, 7, 4, 6
—
—
—
—
8, 7, 4, 6
—
—
3
—
—
7, 6, 11
6, 5
5, 4
—
—
—
—
—
4
—
—
12, 8, 7, 11
6, 5,
—
—
—
—
—
—
4, 7
5
—
—
13, 12, 9, 8,
—
—
—
—
—
—
—
7, 5, 4, 11, 6
6
—
—
7
7
5
—
—
7
7
—.
11. The apparatus of claim 8 , wherein:
the number of HARQ-ACK bits is dependent on the number of received Physical Downlink Shared Channels (PDSCHs) and PDCCHs indicating the downlink SPS release concatenated across serving cells in a single subframe for Frequency Division Duplexed (FDD) and in multiple subframes for Time Division Duplexed (TDD).
12. The apparatus of claim 8 , wherein:
the number of HARQ-ACK bits is O OAK , and
O
ACK
=
W
DAI
UL
+
N
[
U
-
W
DAI
UL
N
]
,
where:
[x] is a ceiling function to obtain a smallest integer not less than x,
U indicates a total number of received Physical Downlink Shared Channels (PDSCHs) and PDCCHs indicating a downlink semi-persistent scheduling (SPS) release in a single previous subframe across all serving cells,
W DAI UL is a detected value of the DAI according to a predefined table, and
N depends on the bit number of the DAI.
13. The apparatus of claim 12 , wherein the at least one processor is further configured to cause the base station to:
receive, from the UE, a number of HARQ-ACK bits in PUSCH with spatial HARQ-ACK bundling across multiple codewords within a downlink subframe by a logical AND operation.
14. The apparatus of claim 13 , wherein:
a spatially bundled HARQ-ACK bit for a particular PDSCH with a corresponding PDCCH or for a particular PDCCH indicating a downlink SPS release in subframe n-4 is associated with O B(k)−1 ACK where B(k) is derived based on a value of DAI V DAI,k DL in a DCI format to schedule a PDSCH detected in subframe n-4 in the k-th serving cell based on a predefined table depending on a number of bits of a third DAI field in the DCI format,
B ( k )= V DAI,k DL +N [ U k −V DAI,k DL )/ N ]
where:
U k denotes a total number of received PDSCHs and PDCCH indicating a downlink SPS release detected by the UE in subframe n-4 cross all serving cells, and
N=4, 8 or 16 corresponding to a 2-bit, 3-bit and 4-bit DAI respectively.
15. A non-transitory computer-readable storage medium storing program instructions executable by at least one processor of a user equipment (UE), the UE configurable for Hybrid Automatic Repeat Request-Acknowledgement (HARQ-ACK) reporting, wherein the program instructions are executable to cause the UE to:
determine HARQ-ACK feedback for transmission in a Physical Uplink Shared Channel (PUSCH), the HARQ-ACK feedback comprising a bit sequence of HARQ-ACK bits, a number of the HARQ-ACK bits and the bit sequence of the HARQ-ACK bits dependent on a value of a Downlink Assignment Index (DAI) of a Physical Downlink Control Channel (PDCCH) received from the serving cell; and
generate the HARQ-ACK bits for transmission on the PUSCH in accordance with the bit sequence,
wherein the number of HARQ-ACK bits is O ACK and is dependent on a number, across serving cells, of received Physical Downlink Shared Channels (PDSCHs) and PDCCHs indicating a downlink semi-persistent scheduling (SPS) release,
DCI format 0 or DCI format 4 uses a 2 bit DAI,
DCI format 1/1A/1B/2/2A/2B/2C/2D uses a 0, 2, or 4 bit DAI that is configured by higher layers,
the 4 bit DAI comprises a 2-bit counter DAI and a 2-bit total DAI, in which:
the 2-bit counter DAI denotes an accumulative number of serving cells with PDSCH transmissions associated with a PDCCH or Enhanced Physical Downlink Control Channel (EPDCCH) and a serving cell with a PDCCH or EPDCCH indicating the downlink SPS release, up to the present serving cell in increasing order of serving cell index, and
the 2-bit total DAI in which the 2-bit total DAI denotes a total number of serving cells with PDSCH transmissions associated with a PDCCH or EPDCCH and a serving cell with a PDCCH or EPDDCH indicating the downlink SPS release, and
a value of the counter DAI, V c−DAI,c DL and of the total DAI, V T−DAI DL for FDD is:
Number of serving cells with PDSCH
DAI
V C-DAI,c DL
transmission associated with
MSB,
or
PDCCH/EPDCCH and serving cell with
LSB
V T-DAI DL
PDCCH/EPDCCH Indicating DL SPS release
0, 0
1
1 or 5 or 9 or 13 or 17 or 21 or 25 or 29
0, 1
2
2 or 6 or 10 or 14 or 18 or 22 or 26 or 30
1, 0
3
3 or 7 or 11 or 15 or 19 or 23 or 27 or 31
1, 1
4
0 or 4 or 8 or 12 or 16 or 20 or 24 or 28 or 3 2.
16. The non-transitory computer readable storage medium of claim 14 , wherein:
for Frequency Division Duplexed (FDD) transmissions, a particular PDCCH is in subframe n-4 and a PUSCH associated with the particular PDCCH is in subframe n.
17. The non-transitory computer readable storage medium of claim 14 , wherein:
for Time Division Duplexed (TDD) transmissions, a particular PUSCH is in the subframe n and PDCCHs associated with the particular PUSCH are in subframes n-k, where k∈K and K is given by:
UL-DL
Config-
Subframe n
uration
0
1
2
3
4
5
6
7
8
9
0
—
—
6
—
4
—
—
6
—
4
1
—
—
7, 6
4
—
—
—
7, 6
4
—
2
—
—
8, 7, 4, 6
—
—
—
—
8, 7, 4, 6
—
—
3
—
—
7, 6, 11
6, 5
5, 4
—
—
—
—
—
4
—
—
12, 8, 7, 11
6, 5,
—
—
—
—
—
—
4, 7
5
—
—
13, 12, 9, 8,
—
—
—
—
—
—
—
7, 5, 4, 11, 6
6
—
—
7
7
5
—
—
7
7
—.
18. The non-transitory computer readable storage medium of claim 14 , wherein:
the number of HARQ-ACK bits is dependent on the number of received Physical Downlink Shared Channels (PDSCHs) and PDCCHs indicating the downlink SPS release concatenated across serving cells in a single subframe for Frequency Division Duplexed (FDD) and in multiple subframes for Time Division Duplexed (TDD).
19. The non-transitory computer readable storage medium of claim 14 , wherein:
the number of HARQ-ACK bits is O ACK , and
O
ACK
=
W
DAI
UL
+
N
[
U
-
W
DAI
UL
N
]
,
where:
[x] is a ceiling function to obtain a smallest integer not less than x,
U indicates a total number of received Physical Downlink Shared Channels (PDSCHs) and PDCCHs indicating a downlink semi-persistent scheduling (SPS) release in a single previous subframe across all serving cells,
W DAI UL is a detected value of the DAI according to a predefined table, and
N depends on the bit number of the DAI.
20. The non-transitory computer readable storage medium of claim 19 , wherein
the program instructions are further executable to cause the UE to:
generate a number of HARQ-ACK bits in a particular PUSCH with spatial HARQ-ACK bundling across multiple codewords within a downlink subframe by a logical AND operation.