Method for performing hybrid automatic repeat request operation in a wireless mobile communication system
A method for performing a Hybrid Automatic Repeat reQuest (HARQ) operation in a wireless mobile communication system that uses Frequency Division Duplex (FDD) or Time Division Duplex (TDD) frames each having a plurality of subframes for communication are provided, in which an HARQ timing including a transmission time of a data burst and a transmission time of an HARQ feedback, for DL HARQ is determined according to data burst assignment information transmitted in a #l DownLink (DL) subframe of a #i frame, and an HARQ operation is performed according to the determined HARQ timing. At least one frame index and at least one subframe index that represent the HARQ timing are determined by using l and i.
1. A method for performing a Hybrid Automatic Repeat reQuest (HARQ) operation in a wireless mobile communication system that uses frames each having a plurality of subframes for communication, the method comprising:
determining an HARQ timing according to data burst assignment information transmitted in a #l DownLink (DL) subframe of a #i frame, the HARQ timing including transmission time of a DL data burst and a transmission time of an HARQ feedback, for DL HARQ; and
performing an HARQ operation according to the determined HARQ timing,
wherein at least one frame index and at least one subframe index that represent the HARQ timing are determined by using l and i.
2. The method of claim 1 , wherein, when a Frequency Division Duplex (FDD) mode is used, the HARQ timing is determined by equations of the following table or a table having result values according to the equations of the following table,
Subframe
Content
Index
Frame Index
Assignment
l
i
Advanced-
MAP (A-
MAP)
Information
Element (IE)
Tx in DL
HARQ
m = l
i
Subpacket
Tx in DL
HARQ feedback in UpLink (UL)
n = ceil(m + F/2)mod F
j
=
(
i
+
floor
(
ceil
(
m
+
F
/
2
)
F
)
+
z
)
mod
N
where l denotes an index of a subframe carrying an assignment A-MAP IE including the data burst assignment information, i denotes an index of a frame carrying the assignment A-MAP IE, m denotes an index of a subframe in which a transmission of an HARQ subpacket corresponding to the data burst starts, n denotes an index of a subframe carrying the HARQ feedback, j denotes an index of a frame carrying the HARQ feedback, F denotes the number of subframes per frame, N denotes the number of frames per superframe and is 4, if each superframe has four frames, and z denotes a DL HARQ feedback offset.
3. The method of claim 2 , wherein the DL HARQ feedback offset z is determined according to a data burst processing time of the HARQ subpacket burst by the following equation,
z
=
{
0
,
for
ceil
(
F
/
2
)
-
N
TTI
≥
Rx_time
1
,
for
ceil
(
F
/
2
)
-
N
TTI
<
Rx_time
where ceil( ) represents a ceiling function, N TTI denotes the number of subframes that the HARQ subpacket spans, and Rx_time denotes the data burst processing time.
4. The method of claim 2 , wherein a retransmission of the data burst corresponding to the HARQ feedback starts in a subframe with the same index m after a predefined number of frames from the transmission of the data burst.
5. The method of claim 2 , wherein the performing of the HARQ operation comprises:
transmitting the HARQ subpacket that starts in the #m DL subframe of the #i frame to a Mobile Station (MS) by a Base Station (BS); and
receiving the HARQ feedback for the HARQ subpacket in the #n UL subframe of the #j frame from the MS by the BS.
6. The method of claim 2 , wherein the performing of the HARQ operation comprises:
receiving the HARQ subpacket that starts in the #m DL subframe of the #i frame from a BS by an MS; and
transmitting the HARQ feedback for the HARQ subpacket in the #n UL subframe of the #j frame to the BS by the MS.
7. The method of claim 1 , wherein, when a FDD mode is used and a long Time Transmission Interval (TTI) in which the data burst occupies two or more subframes, the HARQ timing is determined by the following equations or a table having result values according to the following equations,
m
=
{
x
1
i
0
≤
l
≤
x
1
x
2
i
x
1
<
l
≤
x
2
⋮
⋮
x
max
i
x
max
-
1
≤
l
≤
x
max
x
1
i
+
1
x
max
<
l
<
F
n
=
ceil
(
l
+
F
/
2
)
mod
F
j
=
(
i
+
floor
(
ceil
(
m
+
F
/
2
)
F
)
+
z
)
mod
N
z
=
{
0
if
(
ceil
(
F
/
2
)
-
N
TTI
+
(
m
-
l
)
)
≥
Process
ing
time
1
else
where l denotes an index of a subframe carrying an assignment A-MAP IE including the data burst assignment information, i denotes an index of a frame carrying the assignment A-MAP IE, m denotes an index of a subframe in which a transmission of an HARQ subpacket corresponding to the data burst starts, n denotes an index of a subframe carrying the HARQ feedback, j denotes an index of a frame carrying the HARQ feedback, F denotes the number of subframes per frame, N denotes the number of frames per superframe and is 4, if each superframe has four frames, z denotes a DL HARQ feedback offset, and x n i denotes a #x n subframe of a #i frame.
8. The method of claim 2 , wherein, when a Time Division Duplex (TDD) mode is used, the HARQ timing is determined by equations of the following table or a table having result values according to the equations of the following table,
Content
Subframe index
Frame index
Assignment
l
i
Advanced-MAP
(A-MAP)
Information
Element (IE) Tx
in DL
HARQ Subpacket
m = l
i
Tx in DL
HARQ feedback in UL
For D > U,
n
=
{
0
,
for
0
≤
m
<
K
m
-
K
,
for
K
≤
m
<
U
+
K
U
-
1
,
for
U
+
K
≤
m
<
D
For D ≦ U, n = m − K
j = (i + z)mod N
where the frame each has D DownLink (DL) subframes and U UpLink (UL) subframes, l denotes an index of a subframe carrying an assignment A-MAP) IE including the data burst assignment information, ranging from 0 to D−1, i denotes an index of a frame carrying the assignment A-MAP IE, m denotes an index of a subframe in which a transmission of an HARQ subpacket corresponding to the data burst starts, n denotes an index of a subframe carrying the HARQ feedback, j denotes an index of a frame carrying the HARQ feedback, N denotes the number of frames per superframe and is 4, if each superframe has four frames, z denotes a DL HARQ feedback offset, if D is smaller than U, K is calculated by −ceil{(U−D)/2}, and if D is equal to or greater than U, K is calculated by floor{(D−U)/2}.
9. The method of claim 8 , wherein the DL HARQ feedback offset z is determined according to a data burst processing time of the HARQ subpacket burst by the following equation,
z
=
{
0
,
for
D
-
m
-
N
TTI
+
n
≥
Rx_time
1
,
for
D
-
m
-
N
TTI
+
n
<
Rx_time
where N TTI denotes the number of subframes that the HARQ subpacket spans, and Rx_time denotes the data burst processing time.
10. The method of claim 8 , wherein a retransmission of the data burst corresponding to the HARQ feedback starts at a subframe having the subframe index m after a predetermined number of frames from a transmission of the data burst.
11. The method of claim 8 , wherein if the subframe indexes l, m and n are used as DL subframe indexes, each of the subframe indexes l, m and n ranges from 0 to D−1, D being the number of DL subframes defined in a period except a period supporting a legacy system in each frame, if the subframe indexes l, m and n are used as UL subframe indexes, each of the subframe indexes l, m and n ranges from 0 to U−1, U being the number of UL subframes defined in a period except a period supporting a legacy system in each frame, and the frame indexes are calculated by a subframe index order corresponding to an entire duration including a period supporting a legacy system within each frame.
12. The method of claim 8 , wherein if the subframe indexes l, m and n are used as DL subframe indexes, the DL subframe indexes are reordered indexes for DL subframes used for communication from a Relay Station (RS) to an MS, if the subframe indexes l, m and n are used as UL subframe indexes, the UL subframe indexes are reordered indexes for UL subframes used for communication from the MS to the RS, and the frame indexes are calculated by a subframe index order corresponding to an entire duration used for a communications with the RS within each frame.
13. The method of claim 8 , wherein the performing of the HARQ operation comprises:
transmitting the HARQ subpacket that starts in the #m th DL subframe of the #i frame to a Mobile Station (MS) by a Base Station (BS); and
receiving the HARQ feedback for the HARQ subpacket in the #n UL subframe of the #j frame from the MS by the BS.
14. The method of claim 8 , wherein the performing of the HARQ operation comprises:
receiving the HARQ subpacket that starts in the #m DL subframe of the #i frame from a BS by an MS; and
transmitting the HARQ feedback for the HARQ subpacket in the #n UL subframe of the #j frame to the BS by the MS.
15. The method of claim 1 , wherein if an assignment A-MAP IE including the data burst assignment information indicates a long Transmission Time Interval (TTI) transmission and l is not 0 on a TDD mode, transmission of an HARQ subpacket corresponding to the data burst starts in a #0 DL subframe of an #(i+1) frame and the HARQ feedback for the HARQ subpacket is transmitted in an #n′ UL subframe of a #j′ frame, and
wherein the long TTI transmission means that the HARQ subpacket spans two or more subframes and the subframe index n′ and the frame index j′ are determined by the following equations or a table having result values according to the following equations,
n
′
=
{
0
,
for
0
≤
l
<
K
l
-
K
,
for
K
≤
l
<
U
+
K
,
For
D
>
U
U
-
1
,
for
U
+
K
≤
l
<
D
n
′
=
l
-
K
,
For
D
≤
U
j
′
=
(
(
i
+
1
)
+
z
)
mod
N
.
16. A method for performing a Hybrid Automatic Repeat reQuest (HARQ) operation in a wireless mobile communication system that uses frames each having a plurality of subframes for communication, the method comprising:
determining an HARQ timing according to data burst assignment information transmitted in a #l DownLink (DL) subframe of a #i frame, the HARQ timing including transmission time of a UpLink (UL) data burst, a transmission time of an HARQ feedback, and a retransmission time of the data burst, for UL HARQ; and
performing an HARQ operation according to the determined HARQ timing,
wherein at least one frame index and at least one subframe index that represent the HARQ timing are determined by using l and i.
17. The method of claim 16 , wherein, when a Frequency Division Duplex (FDD) mode is used, the HARQ timing is determined by equations of the following table or a table having result values according to the equations of the following table,
Subframe
Content
index
Frame index
Assignment
l
i
Advanced-MAP
(A-MAP)
Information
Element (IE) Tx
in DL
HARQ Subpacket Tx in UpLink (UL)
m = n where n = ceil (l + F/2) mod F
j
=
(
i
+
floor
(
ceil
(
l
+
F
/
2
)
F
)
+
v
)
mod
N
HARQ feedback in DL
l
k
=
(
j
+
floor
(
m
+
F
/
2
F
)
+
w
)
mod
N
where l denotes an index of a subframe carrying an assignment A-MAP IE including the data burst assignment information, i denotes an index of a frame carrying the assignment A-MAP IE, m denotes an index of a subframe in which a transmission of an HARQ subpacket corresponding to the data burst starts, j denotes an index of a frame carrying the HARQ feedback, F denotes the number of subframes per frame, N denotes the number of frames per superframe and is 4, if each superframe has four frames, k denotes an index of a frame carrying the HARQ feedback, v denotes a UL HARQ transmission offset, and w denotes a UL HARQ feedback offset.
18. The method of claim 17 , wherein the UL HARQ transmission offset v and the UL HARQ feedback offset w are determined according to a data burst processing time of the HARQ subpacket burst by the following equations or a table having result values according to the following equations,
v
=
{
0
,
for
ceil
(
F
/
2
)
-
1
≥
Rx_time
1
,
for
ceil
(
F
/
2
)
-
1
<
Rx_time
w
=
{
0
,
for
floor
(
F
/
2
)
-
N
TTI
≥
Rx_time
1
,
for
floor
(
F
/
2
)
-
N
TTI
<
Rx_time
where ceil( ) represents a ceiling function, floor( ) represents a floor function, N TTI denotes the number of subframes that the HARQ subpacket spans, and Rx_time denotes the data burst processing time.
19. The method of claim 17 , wherein a retransmission of the data burst corresponding to the HARQ feedback starts at a time determined by an equation of the following table or a table having result values according to the equation of the following table,
Subframe
Content
index
Frame index
HARQ subpacket ReTx in UL
m
p
=
(
k
+
floor
(
ceil
(
l
+
F
/
2
)
F
)
+
v
)
mod
N
where p denotes an index of a frame in which the retransmission of the data burst starts, if the HARQ feedback is a Negative ACKnowledgement (NACK), v denotes the UL HARQ transmission offset, and w denotes the UL HARQ feedback offset.
20. The method of claim 17 , wherein the performing of the HARQ operation comprises:
receiving the HARQ subpacket that starts in the #m UL subframe of the #j frame from a Mobile Station (MS) by a Base Station (BS);
transmitting the HARQ feedback for the HARQ subpacket in the #l DownLink (DL) subframe of the #k frame to the MS by the BS; and
receiving a retransmission of the HARQ packet, which starts in the #m UL subframe of the #p frame from the MS by the BS.
21. The method of claim 17 , wherein the performing of the HARQ operation comprises:
transmitting the HARQ subpacket that starts in the #m UL subframe of the #j frame to a BS by an MS;
receiving the HARQ feedback for the HARQ subpacket in the #l DL subbframe of the #k frame from the BS by the MS; and
retransmitting the HARQ packet, starting from the #m UL subframe of the #p frame to the BS by the MS.
22. The method of claim 16 , wherein, when a FDD mode is used and a long Time Transmission Interval (TTI) in which the data burst occupies two or more subframes, the HARQ timing is determined by the following equations or a table having result values according to the following equations,
m
{
y
1
i
0
≤
n
≤
y
i
y
2
i
y
1
<
n
≤
y
2
⋮
⋮
y
max
i
y
max
-
1
<
n
≤
y
max
y
1
i
+
1
y
max
<
n
<
F
n
=
ceil
(
l
+
F
/
2
)
mod
F
j
=
(
i
+
floor
(
ceil
(
l
+
F
/
2
)
F
)
+
v
)
mod
N
v
=
{
0
if
(
ceil
(
F
/
2
)
-
1
+
(
m
-
n
)
)
≥
Process
ing
time
1
else
k
=
(
j
+
floor
(
ceil
(
n
+
F
/
2
)
F
)
+
w
)
mod
N
p
=
(
k
+
floor
(
ceil
(
l
+
F
/
2
)
F
)
+
v
)
mod
N
w
=
{
0
if
(
floor
(
F
/
2
)
-
N
TTI
+
(
n
-
m
)
)
≥
Process
ing
time
1
else
where l denotes an index of a subframe carrying an assignment A-MAP IE including the data burst assignment information, i denotes an index of a frame carrying the assignment A-MAP IE, m denotes an index of a subframe in which a transmission of an HARQ subpacket corresponding to the data burst starts, n denotes an index of a subframe carrying the HARQ feedback, j denotes an index of a frame carrying the HARQ feedback, F denotes the number of subframes per frame, N denotes the number of frames per superframe and is 4, if each superframe has four frames, p denotes an index of a frame in which the retransmission of the data burst starts, if the HARQ feedback is a NACK, v denotes a UL HARQ feedback offset, and y n i denotes a #y n subframe of a #i frame.
23. The method of claim 16 , wherein, when a Time Division Duplex (TDD) mode is used, the HARQ timing is determined by equations of the following table or a table having result values according to the equations of the following table,
Content
Subframe index
Frame index
Assignment
l
i
Advanced-MAP
(A-MAP)
Information
Element (IE) Tx
in DL
HARQ
For D ≧ U
j = (i + v) mod 4
Subpacket Tx in
UL
HARQ feedback in DL
m
=
{
0
,
for
0
≤
l
<
K
l
-
K
,
for
K
≤
l
<
U
U
-
1
,
for
U
+
K
≤
l
k
=
(
j
+
floor
(
m
+
F
/
2
F
)
+
w
)
mod
N
where the frame each has D DownLink (DL) subframes and U UpLink (UL) subframes, l denotes an index of a subframe carrying an assignment A-MAP IE including the data burst assignment information, ranging from 0 to D−1, i denotes an index of a frame carrying the assignment A-MAP IE, m denotes an index of a subframe in which a transmission of an HARQ subpacket corresponding to the data burst starts, n denotes an index of a subframe carrying the HARQ feedback, j denotes an index of a frame carrying the HARQ feedback, N denotes the number of frames per superframe and is 4, if each superframe has four frames, k denotes an index of a frame carrying the HARQ feedback, v denotes a UL HARQ transmission offset, w denotes a UL HARQ feedback offset, if D is smaller than U, K is calculated by −ceil{(U−D)/2} and if D is equal to or greater than U, K is calculated by floor {(D−U)/2}.
24. The method of claim 23 , wherein the UL HARQ transmission offset v and the UL HARQ feedback offset w are determined according to a data burst processing time of the HARQ subpacket burst by the following equations,
v
=
{
0
,
for
D
-
l
-
1
+
m
≥
Tx_time
1
,
for
D
-
l
-
1
+
m
<
Tx_time
w
=
{
0
,
for
U
-
m
-
N
TTI
+
l
≥
Rx_time
1
,
for
U
-
m
-
N
TTI
+
l
<
Rx_time
where N TTI denotes the number of subframes that the HARQ subpacket spans, and each of Tx_Time and Rx_Time denotes the data burst processing time.
25. The method of claim 23 , wherein a retransmission of the data burst corresponding to the HARQ feedback starts at a time determined by the following table,
Content
Subframe index
Frame index
HARQ Subpacket
m
p = (k + v) mod 4
ReTx in UL
where p denotes an index of a frame in which the retransmission of the data burst starts, if the HARQ feedback is a Negative ACKnowledgement (NACK).
26. The method of claim 23 , wherein if the subframe indexes l, m and n are used as DL subframe indexes, each of the subframe indexes l, m and n ranges from 0 to D−1, D being the number of DL subframes defined in a period except a period supporting a legacy system in each frame, if the subframe indexes l, m and n are used as UL subframe indexes, each of the subframe indexes l, m and n ranges from 0 to U−1, U being the number of UL subframes defined in a period except a period supporting a legacy system in each frame, and the frame indexes are calculated by a subframe index order corresponding to an entire duration including a period supporting a legacy system within each frame.
27. The method of claim 23 , wherein if the subframe indexes l, m and n are used as DL subframe indexes, the DL subframe indexes are reordered indexes for DL subframes used for communication from a Relay Station (RS) to an MS, if the subframe indexes l, m and n are used as UL subframe indexes, the UL subframe indexes are reordered indexes for UL subframes used for communication from the MS to the RS, and the frame indexes are calculated by a subframe index order corresponding to an entire duration used for a communications with the RS within each frame.
28. The method of claim 23 , wherein the performing of the HARQ operation comprises:
receiving the HARQ subpacket that starts in the #m UL subframe of the #j frame from a Mobile Station (MS) by a Base Station (BS);
transmitting the HARQ feedback for the HARQ subpacket in the #l DL subframe of the #k frame to the MS by the BS; and
receiving a retransmission of the HARQ subpacket, starting from the #m UL subframe of the #p frame from the MS by the BS.
29. The method of claim 23 , wherein the performing of the HARQ operation comprises:
transmitting the HARQ subpacket that starts in the #m UL subframe of the #j frame to a BS by an MS;
receiving the HARQ feedback for the HARQ subpacket in the #l DL subbframe of the #k frame from the BS by the MS; and
retransmitting the HARQ subpacket, starting from the #m UL subframe of the #p frame to BS by the MS.
30. The method of claim 16 , wherein if an assignment A-MAP IE including the data burst assignment information indicates a long Transmission Time Interval (TTI) transmission on a TDD mode, transmission of an HARQ subpacket corresponding to the data burst starts in a #0 UL subframe of a #j frame and the HARQ feedback for the HARQ subpacket is transmitted in an #l UL subframe of a #p frame, and
wherein the long TTI transmission means that the HARQ subpacket spans two or more subframes.
31. An apparatus for performing a Hybrid Automatic Repeat reQuest (HARQ) operation in a wireless mobile communication system that uses frames each having a plurality of subframes for communication, the apparatus comprising:
a controller for determining an HARQ timing according to data burst assignment information transmitted in a #l DownLink (DL) subframe of a #i frame, the HARQ timing including transmission time of a DL data burst and a transmission time of an HARQ feedback, for DL HARQ; and
a transcevier for performing an HARQ operation according to the determined HARQ timing,
wherein at least one frame index and at least one subframe index that represent the HARQ timing are determined by using l and i.
32. The apparatus of claim 31 , wherein, when a Frequency Division Duplex (FDD) mode is used, the controller determines the HARQ timing by equations of the following table or a table having result values according to the equations of the following table,
Content
Subframe index
Frame index
Assignment
l
i
Advanced-MAP
(A-MAP)
Information
Element (IE)
Tx in DL
HARQ
m = l
i
Subpacket
Tx in DL
HARQ feedback in UpLink (UL)
n = ceil(m + F/2)mod F
j
=
(
i
+
floor
(
ceil
(
m
+
F
/
2
)
F
)
+
z
)
mod
N
where l denotes an index of a subframe carrying an assignment A-MAP IE including the data burst assignment information, i denotes an index of a frame carrying the assignment A-MAP IE, m denotes an index of a subframe in which a transmission of an HARQ subpacket corresponding to the data burst starts, n denotes an index of a subframe carrying the HARQ feedback, j denotes an index of a frame carrying the HARQ feedback, F denotes the number of subframes per frame, N denotes the number of frames per superframe and is 4, if each superframe has four frames, and z denotes a DL HARQ feedback offset.
33. The apparatus of claim 32 , wherein the DL HARQ feedback offset z is determined according to a data burst processing time of the HARQ subpacket burst by the following equation,
z
=
{
0
,
for
ceil
(
F
/
2
)
-
N
TTI
≥
Rx_time
1
,
for
ceil
(
F
/
2
)
-
N
TTI
<
Rx_time
where ceil( ) represents a ceiling function, N TTI denotes the number of subframes that the HARQ subpacket spans, and Rx_time denotes the data burst processing time.
34. The apparatus of claim 32 , wherein a retransmission of the data burst corresponding to the HARQ feedback starts in a subframe with the same index m after a predefined number of frames from the transmission of the data burst.
35. The apparatus of claim 32 , wherein, when the HARQ operation is performed in a Base Station (BS), the transceiver transmits the HARQ subpacket that starts in the #m DL subframe of the #i frame to a Mobile Station (MS), and receives the HARQ feedback for the HARQ subpacket in the #n UL subframe of the #j frame from the MS.
36. The apparatus of claim 32 , wherein, when the HARQ operation is performed in a Mobile Station (MS), the transceiver receives the HARQ subpacket that starts in the #m DL subframe of the #i frame from a Base Station (BS), and transmits the HARQ feedback for the HARQ subpacket in the #n UL subframe of the #j frame to the BS.
37. The apparatus of claim 31 , wherein, when a FDD mode is used and a long Time Transmission Interval (TTI) in which the data burst occupies two or more subframes, the HARQ timing is determined by the following equations or a table having result values according to the following equations,
m
=
{
x
1
i
0
≤
l
≤
x
1
x
2
i
x
1
<
l
≤
x
2
⋮
⋮
x
max
i
x
max
-
1
≤
l
≤
x
max
x
1
i
+
1
x
max
<
l
<
F
n
=
ceil
(
l
+
F
/
2
)
mod
F
j
=
(
i
+
floor
(
ceil
(
m
+
F
/
2
)
F
)
+
z
)
mod
N
z
=
{
0
if
(
ceil
(
F
/
2
)
-
N
TTI
+
(
m
-
l
)
)
≥
Processing
time
1
else
where l denotes an index of a subframe carrying an assignment A-MAP IE including the data burst assignment information, i denotes an index of a frame carrying the assignment A-MAP IE, m denotes an index of a subframe in which a transmission of an HARQ subpacket corresponding to the data burst starts, n denotes an index of a subframe carrying the HARQ feedback, j denotes an index of a frame carrying the HARQ feedback, F denotes the number of subframes per frame, N denotes the number of frames per superframe and is 4, if each superframe has four frames, z denotes a DL HARQ feedback offset, and x n i denotes a #x n subframe of a #i frame.
38. The apparatus of claim 32 , wherein, when a Time Division Duplex (TDD) mode is used, the HARQ timing is determined by equations of the following table or a table having result values according to the equations of the following table,
Content
Subframe index
Frame index
Assignment
l
i
Advanced-MAP
(A-MAP)
Information
Element (IE)
Tx in DL
HARQ
m = l
i
Subpacket
Tx in DL
HARQ feedback in UL
For
D
>
U
,
n
=
{
0
,
for
0
≤
m
<
K
m
-
K
,
for
K
≤
m
<
U
+
K
U
-
1
,
for
U
+
K
≤
m
<
D
For
D
≤
U
,
n
=
m
-
K
j = (i + z)modN
where the frame each has D DownLink (DL) subframes and U UpLink (UL) subframes, l denotes an index of a subframe carrying an assignment A-MAP) IE including the data burst assignment information, ranging from 0 to D−1, i denotes an index of a frame carrying the assignment A-MAP IE, m denotes an index of a subframe in which a transmission of an HARQ subpacket corresponding to the data burst starts, n denotes an index of a subframe carrying the HARQ feedback, j denotes an index of a frame carrying the HARQ feedback, N denotes the number of frames per superframe and is 4, if each superframe has four frames, z denotes a DL HARQ feedback offset, if D is smaller than U, K is calculated by −ceil{(U−D)/2}, and if D is equal to or greater than U, K is calculated by floor{(D−U)/2}.
39. The apparatus of claim 38 , wherein the DL HARQ feedback offset z is determined according to a data burst processing time of the HARQ subpacket burst by the following equation,
z
=
{
0
,
for
D
-
m
-
N
TTI
+
n
≥
Rx_time
1
,
for
D
-
m
-
N
TTI
+
n
<
Rx_time
where N TTI denotes the number of subframes that the HARQ subpacket spans, and Rx_time denotes the data burst processing time.
40. The apparatus of claim 38 , wherein a retransmission of the data burst corresponding to the HARQ feedback starts at a subframe having the subframe index m after a predetermined number of frames from a transmission of the data burst.
41. The apparatus of claim 38 , wherein, if the subframe indexes l, m and n are used as DL subframe indexes, each of the subframe indexes l, m and n ranges from 0 to D−1, D being the number of DL subframes defined in a period except a period supporting a legacy system in each frame, if the subframe indexes l, m and n are used as UL subframe indexes, each of the subframe indexes l, m and n ranges from 0 to U−1, U being the number of UL subframes defined in a period except a period supporting a legacy system in each frame, and the frame indexes are calculated by a subframe index order corresponding to an entire duration including a period supporting a legacy system within each frame.
42. The apparatus of claim 38 , wherein, if the subframe indexes l, m and n are used as DL subframe indexes, the DL subframe indexes are reordered indexes for DL subframes used for communication from a Relay Station (RS) to an MS, if the subframe indexes l, m and n are used as UL subframe indexes, the UL subframe indexes are reordered indexes for UL subframes used for communication from the MS to the RS, and the frame indexes are calculated by a subframe index order corresponding to an entire duration used for a communications with the RS within each frame.
43. The apparatus of claim 38 , wherein, when the HARQ operation is performed in a Base Station (BS), the transceiver transmits the HARQ subpacket that starts in the #m th DL subframe of the #i frame to a Mobile Station (MS), and receives the HARQ feedback for the HARQ subpacket in the #n UL subframe of the #j frame from the MS.
44. The apparatus of claim 38 , wherein, when the HARQ operation is performed in a Mobile Station (MS), the transceiver receives the HARQ subpacket that starts in the #m DL subframe of the #i frame from a Base Station (BS), and transmits the HARQ feedback for the HARQ subpacket in the #n UL subframe of the #j frame to the BS.
45. The apparatus of claim 31 , wherein, if an assignment A-MAP IE including the data burst assignment information indicates a long Transmission Time Interval (TTI) transmission and l is not 0 on a TDD mode, transmission of an HARQ subpacket corresponding to the data burst starts in a #0 DL subframe of an #(i+1) frame and the HARQ feedback for the HARQ subpacket is transmitted in an #n′ UL subframe of a #j′ frame, and
wherein the long TTI transmission means that the HARQ subpacket spans two or more subframes and the subframe index n′ and the frame index j′ are determined by the following equations or a table having result values according to the following equations,
n
′
=
{
0
,
for
0
≤
l
<
K
l
-
K
,
for
K
≤
l
<
U
+
K
,
For
D
>
U
U
-
1
,
for
U
+
K
≤
l
<
D
n
′
=
l
-
K
,
For
D
≤
U
j
′
=
(
(
i
+
1
)
+
z
)
mod
N
.
46. An apparatus for performing a Hybrid Automatic Repeat reQuest (HARQ) operation in a wireless mobile communication system that uses frames each having a plurality of subframes for communication, the apparatus comprising:
a controller for determining an HARQ timing according to data burst assignment information transmitted in a #l DownLink (DL) subframe of a #i frame, the HARQ timing including transmission time of a UpLink (UL) data burst, a transmission time of an HARQ feedback, and a retransmission time of the data burst, for UL HARQ; and
a transceiver for performing an HARQ operation according to the determined HARQ timing,
wherein at least one frame index and at least one subframe index that represent the HARQ timing are determined by using l and i.
47. The apparatus of claim 46 , wherein, when a Frequency Division Duplex (FDD) mode is used, the HARQ timing is determined by equations of the following table or a table having result values according to the equations of the following table,
Content
Sub frame index
index
Assignment
l
i
Advanced-MAP
(A-MAP)
Information
Element (IE) Tx
in DL
HARQ Subpacket Tx in UpLink (UL)
m = n where n = ceil(l + F/2)modF
j
=
(
i
+
floor
(
ceil
(
l
+
F
/
2
)
F
)
+
v
)
mod
N
HARQ feedback in DL
l
k
=
(
j
+
floor
(
m
+
F
/
2
F
)
+
w
)
mod
N
where l denotes an index of a subframe carrying an assignment A-MAP IE including the data burst assignment information, i denotes an index of a frame carrying the assignment A-MAP IE, m denotes an index of a subframe in which a transmission of an HARQ subpacket corresponding to the data burst starts, j denotes an index of a frame carrying the HARQ feedback, F denotes the number of subframes per frame, N denotes the number of frames per superframe and is 4, if each superframe has four frames, k denotes an index of a frame carrying the HARQ feedback, v denotes a UL HARQ transmission offset, and w denotes a UL HARQ feedback offset.
48. The apparatus of claim 47 , wherein the UL HARQ transmission offset v and the UL HARQ feedback offset w are determined according to a data burst processing time of the HARQ subpacket burst by the following equations or a table having result values according to the following equations,
v
=
{
0
,
for
ceil
(
F
/
2
)
-
1
≥
Rx_time
1
,
for
ceil
(
F
/
2
)
-
1
<
Rx_time
w
=
{
0
,
for
floor
(
F
/
2
)
-
N
TTI
≥
Rx_time
1
,
for
floor
(
F
/
2
)
-
N
TTI
<
Rx_time
where ceil( ) represents a ceiling function, floor( ) represents a floor function, N TTI denotes the number of subframes that the HARQ subpacket spans, and Rx_time denotes the data burst processing time.
49. The apparatus of clam 47 , wherein a retransmission of the data burst corresponding to the HARQ feedback starts at a time determined by an equation of the following table or a table having result values according to the equation of the following table,
Content
Subframe index
Frame index
HARQ subpacket ReTx in UL
m
p
=
(
k
+
floor
(
ceil
(
l
+
F
/
2
)
F
)
+
v
)
mod
N
where p denotes an index of a frame in which the retransmission of the data burst starts, if the HARQ feedback is a Negative ACKnowledgement (NACK), v denotes the UL HARQ transmission offset, and w denotes the UL HARQ feedback offset.
50. The apparatus of claim 47 , wherein, when the HARQ operation is performed in a Base Station (BS), the transceiver receives the HARQ subpacket that starts in the #m UL subframe of the #j frame from a Mobile Station (MS), transmits the HARQ feedback for the HARQ subpacket in the #l DownLink (DL) subframe of the #k frame to the MS, and receives a retransmission of the HARQ packet, which starts in the #m UL subframe of the #p frame from the MS.
51. The apparatus of claim 47 , wherein, when the HARQ operation is performed in a Mobile Station (MS), the transceiver transmits the HARQ subpacket that starts in the #m UL subframe of the #j frame to a Base Station (BS), receives the HARQ feedback for the HARQ subpacket in the #l DL subbframe of the #k frame from the BS, and retransmits the HARQ packet, starting from the #m UL subframe of the #p frame to the BS.
52. The apparatus of claim 46 , wherein, when a FDD mode is used and a long Time Transmission Interval (TTI) in which the data burst occupies two or more subframes, the HARQ timing is determined by the following equations or a table having result values according to the following equations,
m
=
{
y
1
i
0
≤
n
≤
y
1
y
2
i
y
1
<
n
≤
y
2
⋮
⋮
y
max
i
y
max
-
1
<
n
≤
y
max
y
1
i
+
1
y
max
<
n
<
F
n
=
ceil
(
l
+
F
/
2
)
mod
F
j
=
(
i
+
floor
(
ceil
(
l
+
F
/
2
)
F
)
+
v
)
mod
N
v
=
{
0
if
(
ceil
(
F
/
2
)
-
1
+
(
m
-
n
)
)
≥
Processing
time
1
else
k
=
(
j
+
floor
(
ceil
(
n
+
F
/
2
)
F
)
+
w
)
mod
N
p
=
(
k
+
floor
(
ceil
(
l
+
F
/
2
)
F
)
+
v
)
mod
N
w
=
{
0
if
(
floor
(
F
/
2
)
-
N
TTI
+
(
n
-
m
)
)
≥
Processing
time
1
else
where l denotes an index of a subframe carrying an assignment A-MAP IE including the data burst assignment information, i denotes an index of a frame carrying the assignment A-MAP IE, m denotes an index of a subframe in which a transmission of an HARQ subpacket corresponding to the data burst starts, n denotes an index of a subframe carrying the HARQ feedback, j denotes an index of a frame carrying the HARQ feedback, F denotes the number of subframes per frame, N denotes the number of frames per superframe and is 4, if each superframe has four frames, p denotes an index of a frame in which the retransmission of the data burst starts, if the HARQ feedback is a NACK, v denotes a UL HARQ feedback offset, and y n i denotes a #y n subframe of a #i frame.
53. The apparatus of claim 46 , wherein, when a Time Division Duplex (TDD) mode is used, the HARQ timing is determined by equations of the following table or a table having result values according to the equations of the following table,
Content
Subframe index
Frame index
Assignment
l
i
Advanced-MAP
(A-MAP)
Information
Element (IE) Tx in
DL
HARQ Subpacket
For D ≧ U
j = (i + v) mod 4
HARQ feedback in DL
m
=
{
0
,
for
0
≤
l
<
K
l
-
K
,
for
K
≤
l
<
U
U
-
1
,
for
U
+
K
≤
l
k
=
(
j
+
floor
(
m
+
F
/
2
F
)
+
w
)
mod
N
where the frame each has D DownLink (DL) subframes and U UpLink (UL) subframes, l denotes an index of a subframe carrying an assignment A-MAP IE including the data burst assignment information, ranging from 0 to D−1, i denotes an index of a frame carrying the assignment A-MAP IE, m denotes an index of a subframe in which a transmission of an HARQ subpacket corresponding to the data burst starts, n denotes an index of a subframe carrying the HARQ feedback, j denotes an index of a frame carrying the HARQ feedback, N denotes the number of frames per superframe and is 4, if each superframe has four frames, k denotes an index of a frame carrying the HARQ feedback, v denotes a UL HARQ transmission offset, w denotes a UL HARQ feedback offset, if D is smaller than U, K is calculated by −ceil{(U−D)/2} and if D is equal to or greater than U, K is calculated by floor{(D−U)/2}.
54. The apparatus of claim 53 , wherein the UL HARQ transmission offset v and the UL HARQ feedback offset w are determined according to a data burst processing time of the HARQ subpacket burst by the following equations,
v
=
{
0
,
for
D
-
l
-
1
+
m
≥
Tx_time
1
,
for
D
-
l
-
1
+
m
<
Tx_time
w
=
{
0
,
for
U
-
m
-
N
TTI
+
l
≥
Rx_time
1
,
for
U
-
m
-
N
TTI
+
l
<
Rx_time
where N TTI denotes the number of subframes that the HARQ subpacket spans, and each of Tx_Time and Rx_Time denotes the data burst processing time.
55. The apparatus of claim 53 , wherein a retransmission of the data burst corresponding to the HARQ feedback starts at a time determined by the following table,
Content
Subframe index
Frame index
HARQ Subpacket
m
p = (k + v) mod 4
ReTx in UL
where p denotes an index of a frame in which the retransmission of the data burst starts, if the HARQ feedback is a Negative ACKnowledgement (NACK).
56. The apparatus of claim 53 , wherein if the subframe indexes l, m and n are used as DL subframe indexes, each of the subframe indexes l, m and n ranges from 0 to D−1, D being the number of DL subframes defined in a period except a period supporting a legacy system in each frame, if the subframe indexes l, m and n are used as UL subframe indexes, each of the subframe indexes l, m and n ranges from 0 to U−1, U being the number of UL subframes defined in a period except a period supporting a legacy system in each frame, and the frame indexes are calculated by a subframe index order corresponding to an entire duration including a period supporting a legacy system within each frame.
57. The apparatus of claim 53 , wherein if the subframe indexes l, m and n are used as DL subframe indexes, the DL subframe indexes are reordered indexes for DL subframes used for communication from a Relay Station (RS) to an MS, if the subframe indexes l, m and n are used as UL subframe indexes, the UL subframe indexes are reordered indexes for UL subframes used for communication from the MS to the RS, and the frame indexes are calculated by a subframe index order corresponding to an entire duration used for a communications with the RS within each frame.
58. The apparatus of claim 53 , wherein when the HARQ operation is performed in a Base Station (BS), the transceiver receives the HARQ subpacket that starts in the #m UL subframe of the #j frame from a Mobile Station (MS), transmits the HARQ feedback for the HARQ subpacket in the #l DL subframe of the #k frame to the MS, and receives a retransmission of the HARQ subpacket, starting from the #m UL subframe of the #p frame from the MS by the BS.
59. The apparatus of claim 53 , wherein when the HARQ operation is performed in a Mobile Station (MS), the transceiver transmits the HARQ subpacket that starts in the #m UL subframe of the #j frame to a BS, receives the HARQ feedback for the HARQ subpacket in the #l DL subbframe of the #k frame from the BS, and retransmits the HARQ subpacket, starting from the #m UL subframe of the #p frame to BS.
60. The apparatus of claim 46 , wherein if an assignment A-MAP IE including the data burst assignment information indicates a long Transmission Time Interval (TTI) transmission on a TDD mode, transmission of an HARQ subpacket corresponding to the data burst starts in a #0 UL subframe of a #j frame and the HARQ feedback for the HARQ subpacket is transmitted in an #l UL subframe of a #p frame, and
wherein the long TTI transmission means that the HARQ subpacket spans two or more subframes.