Method for scheduling distributed virtual resource blocks
View Patent ↗A method for transmitting downlink data using resource blocks at a base station in a wireless mobile communication system includes transmitting downlink data mapped to physical resource blocks (PRBs) to a user equipment, wherein indexes of virtual resource blocks (VRBs) are mapped to indexes of the PRBs for a first slot and a second slot of a subframe, and the indexes of the PRBs for the second slot are shifted with respect to the indexes of the PRBs for the first slot based on a predetermined gap, and wherein a predetermined offset is applied to an index of a PRB when the index of the PRB is equal to or greater than a predetermined threshold.
1. A method for transmitting downlink data using resource blocks at a base station in a wireless mobile communication system, the method comprising:
transmitting downlink data mapped to physical resource blocks (PRBs) to a user equipment,
wherein:
indexes of virtual resource blocks (VRBs) are mapped to indexes of the PRBs for a first slot and a second slot of a subframe, and the indexes of the PRBs for the second slot are shifted with respect to the indexes of the PRBs for the first slot based on a predetermined gap;
a predetermined offset is applied to an index of a PRB when the index of the PRB is equal to or greater than a predetermined threshold; and
the predetermined threshold is N VRB/2 where N VRB is a number of consecutive indexes of the VRBs.
2. The method according to claim 1 ,
wherein the predetermined offset is defined as N gap −N VRB/2 ,
where N gap is a value of the predetermined gap.
3. The method according to claim 2 ,
wherein N VRB is defined as N VRB =2·min(N gap , N PRB −N gap ),
where N PRB is a number of the PRBs.
4. The method according to claim 3 ,
wherein the consecutive indexes of the VRBs are interleaved as the indexes of the VRBs are written row by row in a rectangular matrix, and read out column by column, and
wherein a number of rows of the rectangular matrix, R, is defined as
R=┌N VRB /( C·M RBG )┐· M RBG ,
where C is a number of columns of the rectangular matrix, and M RBG is a number of consecutive PRBs that constitute a resource block group (RBG).
5. The method according to claim 4 , wherein C is equal to 4.
6. The method according to claim 4 ,
wherein the rectangular matrix includes N D regions, and C is equal to K·N D ,
wherein when N null nulls are inserted into the rectangular matrix, the nulls are inserted in the last N null /N D rows of the K-th column in each of the N D regions of the rectangular matrix,
wherein the nulls are ignored when the indexes of the VRBs are read out from the rectangular matrix,
where N null =C·┌N VRB /(C·M RBG )┐·M RBG −N VRB =C·R−N VRB .
7. The method according to claim 6 , wherein K is 2 and N D is 2.
8. The method according to claim 6 ,
wherein an index p 1,d of one of the PRBs for the first slot mapped to an index d of one of the VRBs is defined as:
p
1
,
d
=
{
p
1
,
d
′
-
R
,
when
N
null
≠
0
and
(
d
≥
N
VRB
-
N
null
and
d
mod
(
C
/
2
)
=
1
)
p
1
,
d
′
-
R
+
N
null
/
2
,
when
N
null
≠
0
and
(
d
≥
N
VRB
-
N
null
and
d
mod
(
C
/
2
)
=
0
)
where
p
1
,
d
′
-
2
R
·
(
d
mod
C
/
2
)
+
⌊
2
d
/
C
⌋
p
1
,
d
=
{
p
1
,
d
′
-
N
null
/
2
,
when
N
null
≠
0
and
(
d
<
N
VRB
-
N
null
and
d
mod
C
≥
2
)
p
1
,
d
′
,
when
N
null
=
0
or
(
d
<
N
VRB
-
N
null
and
d
mod
C
<
2
)
where
p
1
,
d
′
-
R
·
(
d
mod
C
)
+
⌊
2
d
/
C
⌋
,
wherein an index p 2,d of one of the PRBs for the second slot mapped to the index d of one of the VRBs is defined as:
p 2,d =( p 1,d +N VRB /2)mod N VRB .
9. The method according to claim 8 ,
wherein an index O i,d of one of the PRBs for the i-th slot ( i= 1, 2) mapped to the index d of one of the VRBs is defined as:
o
i
,
d
=
{
p
i
,
d
,
when
p
i
,
d
<
N
VRB
/
2
p
i
,
d
+
N
gap
-
N
VRB
/
2
,
when
p
i
,
d
≥
N
VRB
/
2.
10. A method for receiving downlink data using resource blocks at a user equipment in a wireless mobile communication system, the method comprising:
receiving downlink control information including resource allocation information for the downlink data from a base station; and
receiving the downlink data mapped to physical resource blocks (PRBs) based on the downlink control information,
wherein:
the resource allocation information indicates virtual resource block (VRB) allocations for the user equipment;
indexes of PRBs to which the downlink data are mapped are determined based on mapping relationship between VRBs and the PRBs;
the mapping relationship is defined as indexes of the VRBs are mapped to indexes of the PRBs for a first slot and a second slot of a subframe and the indexes of the PRBs for the second slot are shifted with respect to the indexes of the PRBs for the first slot based on a predetermined gap;
a predetermined offset is applied to an index of a PRB when the index of the PRB is equal to or greater than a predetermined threshold; and
the predetermined threshold is N VRB /2 where N VRB is a number of consecutive indexes of the VRBs.
11. The method according to claim 10 ,
wherein the predetermined offset is defined as N gap −N VRB /2,
where N gap is a value of the predetermined gap.
12. The method according to claim 11 ,
wherein the consecutive indexes of the VRBs are interleaved, and
wherein a number of the consecutive indexes of VRBs, N VRB , is defined as N VRB =2·min(N gap , N PRB −N gap ),
where N gap is a value of the predetermined gap and N PRB is a number of the PRBs.
13. The method according to claim 12 ,
wherein the consecutive indexes of the VRBs are interleaved as the indexes of the VRBs are written row by row in a rectangular matrix, and read out column by column, and
wherein a number of rows of the rectangular matrix, R, is defined as
R=┌N VRB /( C·M RBG )┐· M RBG ,
where C is a number of columns of the rectangular matrix, and M RBG is a number of consecutive PRBs that constitute a resource block group (RBG).
14. The method according to claim 13 , wherein C is equal to 4.
15. The method according to claim 13 ,
wherein the rectangular matrix includes N D regions, and C is equal to K·N D ,
wherein when N null nulls are inserted into the rectangular matrix, the nulls are inserted in the last N null /N D rows of the K-th column in each of the N D regions of the rectangular matrix,
wherein the nulls are ignored when the indexes of the VRBs are read out from the rectangular matrix,
where N null =C·┌N VRB /(C·M RBG )┐·M RBG −N VRB =C·R−N VRB .
16. The method according to claim 15 , wherein K is 2 and N D is 2.
17. The method according to claim 15 ,
wherein an index p 1,d of one of the PRBs for the first slot mapped to an index d of one of the VRBs is defined as:
p
1
,
d
=
{
p
1
,
d
′
-
R
,
when
N
null
≠
0
and
(
d
≥
N
VRB
-
N
null
and
d
mod
(
C
/
2
)
=
1
)
p
1
,
d
′
-
R
+
N
null
/
2
,
when
N
null
≠
0
and
(
d
≥
N
VRB
-
N
null
and
d
mod
(
C
/
2
)
=
0
)
where
p
1
,
d
′
-
2
R
·
(
d
mod
C
/
2
)
+
⌊
2
d
/
C
⌋
p
1
,
d
=
{
p
1
,
d
′
-
N
null
/
2
,
when
N
null
≠
0
and
(
d
<
N
VRB
-
N
null
and
d
mod
C
≥
2
)
p
1
,
d
′
,
when
N
null
=
0
or
(
d
<
N
VRB
-
N
null
and
d
mod
C
<
2
)
where
p
1
,
d
′
-
R
·
(
d
mod
C
)
+
⌊
2
d
/
C
⌋
,
wherein an index p 2,d of one of the PRBs for the second slot mapped to the index d of one of the VRBs is defined as:
p 2,d =( p 1,d +N VRB /2)mod N VRB .
18. The method according to claim 17 ,
wherein an index O i,d of one of the PRBs for the i-th slot ( i= 1, 2) mapped to the index d of one of the VRBs is defined as:
o
i
,
d
=
{
p
i
,
d
,
when
p
i
,
d
<
N
VRB
/
2
p
i
,
d
+
N
gap
-
N
VRB
/
2
,
when
p
i
,
d
≥
N
VRB
/
2.
19. A base station transmitting downlink data using resource blocks in a wireless mobile communication system, the base station comprising:
a processor configured to control an operation of the base station; and
a memory unit driven by the processor,
wherein:
the processor is further configured to transmit downlink data mapped to physical resource blocks (PRBs) to a user equipment;
indexes of virtual resource blocks (VRBs) are mapped to indexes of the PRBs for a first slot and a second slot of a subframe, and the indexes of the PRBs for the second slot are shifted with respect to the indexes of the PRBs for the first slot based on a predetermined gap;
a predetermined offset is applied to an index of a PRB when the index of the PRB is equal to or greater than a predetermined threshold; and
the predetermined threshold is N VRB /2 where N VRB is a number of consecutive indexes of the VRBs.
20. A user equipment for receiving downlink data using resource blocks in a wireless mobile communication system, the user equipment comprising:
a processor configured to control an operation of the user equipment; and
a memory unit driven by the processor,
wherein the processor is further configured to receive downlink control information including resource allocation information for the downlink data from a base station and to receive the downlink data mapped to physical resource blocks (PRBs) based on the downlink control information,
wherein:
the resource allocation information indicates virtual resource block (VRB) allocations for the user equipment;
indexes of PRBs to which the downlink data are mapped are determined based on mapping relationship between VRBs and the PRBs;
the mapping relationship is defined as indexes of the VRBs are mapped to the indexes of the PRBs for a first slot and a second slot of a subframe and the indexes of the PRBs for the second slot are shifted with respect to the indexes of the PRBs for the first slot based on a predetermined gap;
a predetermined offset is applied to an index of a PRB when the index of the PRB is equal to or greater than a predetermined threshold; and
the predetermined threshold is N VRB /2 where N VRB is a number of consecutive indexes of the VRBs.