Improvements to the Sub-band Partitioning Formulas
IEEE 802.16 Presentation Submission Template (Rev. 9) Document Number:
C802.16m-10/0749Date Submitted:
2010-07-09Source:
Fred Vook, Mark Cudak, Bill Hillery, Eugene Visotsky, Anup Talukdar [email protected]
*http://standards.ieee.org/faqs/affiliationFAQ.html
Venue: Session #68 – San Diego MeetingRe: 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
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C80216m-10/0749 2
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 3
Current PHY Structure – D6 Draft
• DSAC=0:1:10
• DCAS_sb0=DSAC
• DFPC=0
• DFPSC=0
• DCAS_mb0=0
• DCASi=0
• IDCell=2
0 5 10 15 20 25 30 35 40 45
0
1
2
3
4
5
6
7
8
9
10
Intel Proposal
Physical PRU
DS
AC
Red Squares = Sub-band-CRU
Blue Asterix = Mini-band-CRU
Green Diamonds = DRU
DSAC=2 or 3: Subbands are too close (Bad)
DSAC=9 or 10: DRUs are reasonably spaced (Good)
C80216m-10/0749 4
Proposed Modification
• DSAC=0:1:10
• DCAS_sb0=DSAC
• DFPC=0
• DFPSC=0
• DCAS_mb0=0
• DCASi=0
• IDCell=2
0 5 10 15 20 25 30 35 40 45
0
1
2
3
4
5
6
7
8
9
10
Motorola modification to Intel Proposal
Physical PRU
DS
AC
Red Squares = Sub-band-CRU
Blue Asterix = Mini-band-CRU
Green Diamonds = DRU
DSAC=2 or 3: Subbands are better spaced than in D6 (Good)
DSAC=9 or 10: DRUs have same spacing as currently in D6 (Good)
C80216m-10/0749 5
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.)]
pruMBsubsub
SBsubsubsubMBMB
SBsub
sub NNLjNN
KNNNGCD
N
Lj
N
Lj
KN
NNNi ,}{ mod }{}{ mod}
))/(,({mod 1
1111
1,....,1,0];[][ SBSB LjiPRUjPRU
where
(180)
}{ mod }{}{ mod}))/(,(
{ 111
1 NLjNN
KNNNGCD
N
Lj
N
Lj
KN
NNi MBsub
sub
SBsubsubsubMBMB
SBsub
sub
C80216m-10/0749 6
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.)]
0 ;
0 ;,}{ mod }{}{ mod}))/(,(
{mod 111
11
SB
SBprusubsub
SBsubsubsub
SBsub
sub
Kk
KNNkNN
KNNNGCD
N
k
N
k
KN
NNN
i
0 ;
0 };{ mod }{}{ mod}))/(,(
)(({ 1
111
SB
SBsubsub
SBsubsubsub
SBsub
sub
Kk
KNkNN
KNNNGCD
N
k
N
k
KN
NN
i
[ ] [ ]; 0,1,...., 1MB MBPRU k PRU i k L
where
(181)
C80216m-10/0749 7
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.]
pruMBsubsub
SBsubsubsubMBMB
SBsub
sub NNLjNN
KNNNGCD
N
Lj
N
Lj
KN
NNNi ,}{ mod }{}{ mod}
))/(,({mod 1
1111
[ ] [ ]; 0 1SB SBPRU j PRU i j L
where
(256)
C80216m-10/0749 8
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.]
0 ;
0 ;,}{ mod }{}{ mod}))/(,(
{mod 111
11
SB
SBprusubsub
SBsubsubsub
SBsub
sub
Kk
KNNkNN
KNNNGCD
N
k
N
k
KN
NNN
i
[ ] [ ]; 0,1, , 1MB MBPRU k PRU i k L
where
(257)
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