IEEE C802.16m-10/0749
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Transcript IEEE C802.16m-10/0749
Improvements to the Sub-band Partitioning Formulas
IEEE 802.16 Presentation Submission Template (Rev. 9)
Document Number:
C802.16m-10/0749
Date Submitted:
2010-07-09
Source:
Fred Vook, Mark Cudak, Bill Hillery, Eugene Visotsky, Anup Talukdar
Motorola
[email protected]
*http://standards.ieee.org/faqs/affiliationFAQ.html
Venue: Session #68 – San Diego Meeting
Re: P802.16m/D6 comments for Sponsor Ballot
Area: Section 16.3.5.2.1 – DL PHY Structure
Section 16.3.8.2.1 – UL PHY Structure
Abstract:
In the PHY structure in the D6 draft, when few sub-bands are allocated, those sub-bands are very close together in frequency. We propose to
slightly modify the sub-band partitioning equations in the D6 draft to improve the location of the PRUs that are allocated to be sub-bands
while preserving the spacing of the DRUs achieved in D6.
Purpose: Discuss and adopt
Notice:
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Overview
• This contribution addresses the issue of the spacing between
DRUs and the spacing between Sub-bands in the PHY structure
• Currently in the D6 Draft:
– When few DRUs/Mini-bands are allocated (high DSAC value), they are
spaced reasonably far apart
– However, when few sub-bands are allocated (low DSAC value), they are
spaced very close together, which is not good for frequency selective
scheduling
• We propose a slight modification to the formulas in the D6 draft:
– The modification is to add a simple right circular shift (by N1 PRUs) to the
formulas in the D6 draft
– When few DRUs/Mini-bands are allocated (high DSAC value), they are
spaced reasonably far apart (same spacing as in D6)
– When few Sub-bands are allocated (low DSAC value), they are also spaced
reasonably far apart.
– All other spacings achieved in D6 are preserved by this modification
– All other aspects of the PHY structure are unaffected.
C80216m-10/0749
2
Current PHY Structure – D6 Draft
Intel Proposal
DSAC=0:1:10
DCAS_sb0=DSAC
DFPC=0
DFPSC=0
DCAS_mb0=0
DCASi=0
IDCell=2
DSAC
•
•
•
•
•
•
•
10
9
8
7
6
5
4
3
Red Squares = Sub-band-CRU
2
Blue Asterix = Mini-band-CRU
1
Green Diamonds = DRU
0
0
5
10
15
DSAC=9 or 10: DRUs
are reasonably spaced
(Good)
C80216m-10/0749
20
25
30
Physical PRU
35
40
45
DSAC=2 or 3: Subbands
are too close (Bad)
3
Proposed Modification
DSAC=0:1:10
DCAS_sb0=DSAC
DFPC=0
DFPSC=0
DCAS_mb0=0
DCASi=0
IDCell=2
DSAC
•
•
•
•
•
•
•
Motorola modification to Intel Proposal
10
9
8
7
6
5
4
3
Red Squares = Sub-band-CRU
2
Blue Asterix = Mini-band-CRU
1
Green Diamonds = DRU
0
0
5
10
15
DSAC=9 or 10: DRUs have
same spacing as currently in
D6 (Good)
C80216m-10/0749
20
25
30
Physical PRU
35
40
45
DSAC=2 or 3: Subbands are
better spaced than in D6
(Good)
4
Proposed Text Changes to D6 (1 of 4)
• [ Modify Equation 180 on page 462, starting on line 26 as
follows: (N1 is added to the original equation and the result is
found mod Npru.)]
PRU SB [ j ] PRU [i]; j 0,1,...., LSB 1
(180)
where
N sub
j LMB j LMB GCD( N sub , N sub /( N sub K SB ))
i N 1 {
} mod {N sub } { j LMB } mod {N 1 }
N
K
N
N
N
SB
1
1
sub
sub
N sub j LMB j LMB GCD( N sub , N sub /( N sub K SB ))
i mod N1 N1 {
}
mod
{
N
}
{
j
L
}
mod
{
N
}
,
N
sub
MB
1
pru
N sub
N sub K SB N1 N1
C80216m-10/0749
5
Proposed Text Changes to D6 (2 of 4)
• [ Modify Equation 181 on page 462, starting on line 42 as
follows: (N1 is added to the original equation and the result is
found mod Npru.)]
PRU MB [k ] PRU [i]; k 0,1,...., LMB 1
(181)
where
k k GCD( N sub , N sub /( N sub K SB ))
N sub
K SB 0
N 1 {(
} mod {N sub } {k} mod {N 1 };
i
(
N
K
)
N
N
N
sub
SB 1
sub
1
k
;
K SB 0
N sub k k GCD( N sub , N sub /( N sub K SB ))
mod N1 N1 {
}
mod
{
N
}
{
k
}
mod
{
N
}
,
N
sub
1
pru ;
i
N sub
N sub K SB N1 N1
k
;
C80216m-10/0749
K SB 0
K SB 0
6
Proposed Text Changes to D6 (3 of 4)
• [ Modify Equation 256 on page 663, starting on line 58 as
follows. The denominator in the first ratio has been corrected
(KSB-Nsub has been changed to Nsub-KSB). Also, N1 is added to
the original equation and the result is found mod Npru.]
PRU SB [ j ] PRU [i]; 0 j LSB 1
(256)
where
N sub j LMB j LMB GCD( N sub , N sub /( N sub K SB ))
i mod N1 N1 {
}
mod
{
N
}
{
j
L
}
mod
{
N
}
,
N
sub
MB
1
pru
N sub
N sub K SB N1 N1
C80216m-10/0749
7
Proposed Text Changes to D6 (4 of 4)
• [ Modify Equation 257 on page 664, starting on line 3 as
follows. The denominator in the first ratio has been corrected
(KSB-Nsub has been changed to Nsub-KSB). Also, N1 is added to
the original equation and the result is found mod Npru.]
PRU MB [k ] PRU [i]; k 0,1,
, LMB 1
(257)
where
N sub k k GCD( N sub , N sub /( N sub K SB ))
mod N1 N1 {
}
mod
{
N
}
{
k
}
mod
{
N
}
,
N
sub
1
pru ;
i
N sub
N sub K SB N1 N1
k
;
C80216m-10/0749
K SB 0
K SB 0
8