Method and apparatus for determining allocation of communication resources
A user equipment (UE) receives downlink data using resource blocks in a wireless mobile communication system. The UE receives downlink control information including resource allocation information and downlink data mapped to physical resource blocks (PRBs) based on the downlink control information. The resource allocation information indicates virtual resource block (VRB) allocations for the UE. A resource block pair includes a first resource block associated with a first time slot and a second resource block associated with a second time slot adjacent to the first time slot. The first and second resource blocks are allocated to the same frequency indices. A mapping between VRB pairs and PRB pairs exists such that frequency consecutive VRB pairs are mapped to non-frequency consecutive PRB pairs and that each resource block pair is split so there is a frequency gap between the first and second parts of the resource block pair.
1. A method for receiving a downlink data packet in a user equipment operable in a wireless mobile communication system supporting a resource allocation scheme distributively mapping virtual resource blocks (VRBs) to physical resource blocks (PRBs), the method comprising:
receiving, by the user equipment, downlink control information including resource block assignment information for the downlink data packet; and
receiving, by the user equipment, the downlink data packet based on the downlink control information,
wherein interleaved indexes of the VRBs of the downlink data packet map to N s slots of a frame of the downlink data packet with a gap for distribution in each of the N s slots,
wherein N s denotes a number of slots included in the frame of the downlink data packet,
wherein an index of one of the PRBs on each of N s slots, which maps to an index of one of the VRBs, is based on N gap and N DVRB , and
wherein N gap is a value of the gap for distribution and N DVRB is a number of the VRBs.
2. The method according to claim 1 , wherein:
an index o 1,d of one of the PRBs on an odd slot of N s slots mapped to an index d of one of the VRBs is p 1,d +N gap −N DVRB /2 if a temporary index p 1,d of one of the PRBs on the odd slot that maps to the index d is larger than N DVRB /2,
an index o 2,d of the one of the PRBs on an even slot of N s slots mapped to the index d is p 2,d +N gap −N DVRB /2 if a temporary index p 2,d of one of the PRBs on the even slot that maps to the index d is larger than N DVRB /2,
d has an integer value in a range from 0 to N DVRB −1, and
p 1,d , p 2,d , o 1,d , and o 2,d have an integer value in a range from 0 to N PRB −1, N PRB being a number of the PRBs in the wireless mobile communication system.
3. The method according to claim 2 , wherein the temporary index p 1,d is defined in expression (3), and the temporary index p 2,d is defined in expression (4), wherein
expression (3) is
p
1
,
d
=
{
p
1
,
d
′
,
when
N
null
=
0
or
(
d
<
N
DVRB
-
N
null
and
mod
(
d
,
C
)
<
2
)
p
1
,
d
′
-
N
null
/
2
,
when
N
null
≠
0
and
(
d
<
N
DVRB
-
N
null
and
mod
(
d
,
C
)
≥
2
)
where
p
1
,
d
′
=
mod
(
d
,
C
)
·
R
+
⌊
d
/
C
⌋
p
1
,
d
=
{
p
1
,
d
′
-
R
+
N
null
/
2
,
when
N
null
≠
0
and
(
d
≥
N
DVRB
-
N
null
and
mod
(
d
,
C
/
2
)
=
0
)
p
1
,
d
′
-
R
,
when
N
null
≠
0
and
(
d
≥
N
DVRB
-
N
null
and
mod
(
d
,
C
/
2
)
=
1
)
where
p
1
,
d
′
=
mod
(
d
,
C
/
2
)
·
2
R
+
⌊
2
d
/
C
⌋
;
and
expression (4) is
p 2,d =mod( p 1,d +N DVRB /2, N DVRB )
where R is a number of interleaving rows, C is a number of interleaving columns, the number of the VRBs according to N DVRB is a number of resource blocks for the VRBs, and ‘mod’ means a modulo operation.
4. The method according to claim 1 , wherein:
the resource allocation scheme comprises one resource block group (RBG) including consecutive PRBs indicated by one bit, and the gap for distribution is a multiple of a square of a number of the consecutive PRBs constituting the RBG.
5. The method according to claim 4 , wherein the gap for distribution is defined by the following expression:
N gap =round( N PRB /(2· M RBG 2 ))· M RBG 2
where M RBG is the number of the consecutive PRBs constituting the RBG.
6. The method according to claim 1 , wherein a degree of interleaving for the interleaved indexes of the VRBs of the downlink data packet is equal to a diversity order (N DivOrder ) which is based on the gap for distribution.
7. The method according to claim 6 , wherein N DivOrder is an integer multiple of a number of PRBs mapped to one VRB (ND).
8. The method according to claim 1 , wherein:
the resource allocation scheme comprises one resource block group (RBG) that includes consecutive PRBs and is indicated by one bit, and
the number of the VRBs (N DVRB ) is a multiple of a value corresponding to a product of a square of the number of the consecutive PRBs constituting the RBG (M RBG 2 ) and a number of the PRBs mapped to one VRB (N D ).
9. The method according to claim 1 , wherein:
the resource allocation scheme comprises one resource block group (RBG) that includes consecutive PRBs and is indicated by one bit,
a degree of block interleaving is defined as a number of interleaving columns (C),
a number of interleaving rows (R) is defined in expression (1), with N interleaver being a dimension of interleaving,
a number of interleaving nulls (N null ) is defined in expression (2),
wherein expression (1) is:
R=N interleaver /C=┌N DVRB /( C·M RBG )┐· M RBG
N interleaver =┌N DVRB /( C·M RBG )┐· C·M RBG ,and
wherein expression (2) is:
N null =N interleaver −N DVRB =┌N DVRB /( C·M RBG )┐· C·M RBG −N DVRB
N interleaver =┌N DVRB /( C·M RBG )┐· C·M RBG ,
M RBG is a number of the consecutive PRBs constituting the RBG,
N DVRB is the number of the VRBs, and
C=4.
10. The method according to claim 9 , wherein:
N DVRB is defined in expression (6), and
expression (6) is N DVRB =min(N PRB −N gap ,N gap )·2.
11. A user equipment for receiving a downlink data packet in a wireless mobile communication system supporting a resource allocation scheme distributively mapping virtual resource blocks (VRBs) to physical resource blocks (PRBs), the user equipment comprising:
data processing circuitry to control operation of the user equipment, and
a receiver, coupled to the data processing circuitry, to receive:
downlink control information including resource block assignment information for the downlink data packet; and
the downlink data packet based on the downlink control information,
wherein interleaved indexes of the VRBs of the downlink data packet map to N s slots of a frame of the downlink data packet with a gap in each of the N s slots,
wherein N s denotes a number of slots included in the frame of the downlink data packet,
wherein an index of one of the PRBs on each of N s slots, which maps to an index of one of the VRBs, is based on N gap and N DVRB , and
wherein N gap is a value of the gap for distribution and N DVRB is a number of the VRBs.
12. The user equipment according to claim 11 , wherein:
an index o 1,d of one of the PRBs on an odd slot of N s slots mapped to an index d of one of the VRBs is p 1,d +N gap −N DVRB /2 if a temporary index p 1,d of one of the PRBs on the odd slot that maps to the index d is larger than N DVRB /2,
an index o 2,d of the one of the PRBs on an even slot of N s slots mapped to the index d is p 2,d +N gap −N DVRB /2 if a temporary index p 2,d of one of the PRBs on the even slot that maps to the index d is larger than N DVRB /2,
d has an integer value in a range from 0 to N DVRB −1, and
p 1,d , p 2,d , o 1,d , and o 2,d have an integer value in a range from 0 to N PRB −1, N PRB being a number of the PRBs in the wireless mobile communication system.
13. The user equipment according to claim 12 , wherein the temporary index p 1,d is defined in expression (3), and the temporary index p 2,d is defined in expression (4), wherein
expression (3) is
p
1
,
d
=
{
p
1
,
d
′
,
when
N
null
=
0
or
(
d
<
N
DVRB
-
N
null
and
mod
(
d
,
C
)
<
2
)
p
1
,
d
′
-
N
null
/
2
,
when
N
null
≠
0
and
(
d
<
N
DVRB
-
N
null
and
mod
(
d
,
C
)
≥
2
)
where
p
1
,
d
′
=
mod
(
d
,
C
)
·
R
+
⌊
d
/
C
⌋
p
1
,
d
=
{
p
1
,
d
′
-
R
+
N
null
/
2
,
when
N
null
≠
0
and
(
d
≥
N
DVRB
-
N
null
and
mod
(
d
,
C
/
2
)
=
0
)
p
1
,
d
′
-
R
,
when
N
null
≠
0
and
(
d
≥
N
DVRB
-
N
null
and
mod
(
d
,
C
/
2
)
=
1
)
where
p
1
,
d
′
=
mod
(
d
,
C
/
2
)
·
2
R
+
⌊
2
d
/
C
⌋
;
and
expression (4) is
p 2,d =mod( p 1,d +N DVRB /2, N DVRB )
where R is a number of interleaving rows, C is a number of interleaving columns, the number of the VRBs according to N DVRB is a number of resource blocks for the VRBs, and ‘mod’ means a modulo operation.
14. The user equipment according to claim 11 , wherein:
the resource allocation scheme comprises one resource block group (RBG) including consecutive PRBs indicated by one bit, and the gap for distribution is a multiple of a square of a number of the consecutive PRBs constituting the RBG.
15. The user equipment according to claim 14 , wherein the gap for distribution is defined by the following expression:
N gap =round( N PRB /(2· M RBG 2 ))· M RBG 2
where M RBG is the number of the consecutive PRBs constituting the RBG.
16. The user equipment according to claim 13 , wherein a degree of interleaving for the interleaved indexes of the VRBs of the downlink data packet is equal to a diversity order (N DivOrder ) which is based on the distribution.
17. The user equipment according to claim 16 , wherein N DivOrder is an integer multiple of a number of PRBs mapped to one VRB (N D ).
18. The user equipment according to claim 11 , wherein:
the resource allocation scheme comprises one resource block group (RBG) that includes consecutive PRBs and is indicated by one bit, and
the number of the VRBs (N DVRB ) is a multiple of a value corresponding to a product of a square of the number of the consecutive PRBs constituting the RBG (M RBG 2 ) and a number of the PRBs mapped to one VRB (N D ).
19. The user equipment according to claim 11 , wherein:
the resource allocation scheme comprises one resource block group (RBG) that includes consecutive PRBs and is indicated by one bit,
a degree of interleaving is defined as a number of interleaving columns (C),
a number of interleaving rows (R) is defined by expression (1), with N interleaver being a dimension of interleaving,
the number of nulls (N null ) is defined by expression (2),
wherein expression (1) is:
R=N interleaver /C=┌N DVRB /( C·M RBG )┐· M RBG
N interleaver =┌N DVRB /( C·M RBG )┐· C·M RBG ,and
wherein expression (2) is:
N null =N interleaver −N DVRB =┌N DVRB /( C·M RBG )┐· C·M RBG −N DVRB
N interleaver =┌N DVRB /( C·M RBG )┐· C·M RBG ,
M RBG is a number of the consecutive PRBs constituting the RBG,
N DVRB is the number of the VRBs, and
C=4.
20. The user equipment according to claim 19 , wherein:
N DVRB is defined in expression (6), and
expression (6) is N DVRB =min(N PRB −N gap ,N gap )·2.