Modifications to the Sub-band Partitioning Formulas (Reply to Comment A0564) IEEE 802.16...

Modifications to the Sub-band Partitioning Formulas (Reply to Comment A0564)

IEEE 802.16 Presentation Submission Template (Rev. 9) Document Number:

C802.16m-10/0434Date Submitted:

2010-03-10Source:

Fred Vook, Mark Cudak, Bill Hillery, Eugene Visotsky, Anup Talukdar [email protected]

*http://standards.ieee.org/faqs/affiliationFAQ.html

Venue: Session #66 – Orlando MeetingRe: P802.16m/D4 comments for LB31 – Reply to Comment #A0564 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 D4 draft, when two groups of DRUs are allocated, those two groups are fairly close together in frequency, which is not good for exploiting frequency diversity. Comment A0564 / Contribution C802.16m-10/0044 proposes a modification which provides much better spacing in the DRUs when few DRUs are allocated, but the sub-bands are very close together in frequency when few sub-bands are allocated. We propose to slightly modify the sub-band partitioning equations in contribution C802.16m-10/0044 to improve the location of the PRUs that are allocated to be sub-bands while preserving the spacing of the DRUs achieved in Contribution 10/0044.

Purpose: Discuss and adopt

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http://standards.ieee.org/guides/bylaws/sect6-7.html#Proposed%20Modification%20to%20Contrib%2010/0044%20/%20Comment%20A0564

http://standards.ieee.org/guides/opman/sect6.html#6.3

C80216m-10/0434 2

Modifications to the Sub-band Partitioning Formulas

DL: Section 16.3.5.2.1UL: Section 16.3.8.2.1

Reply to Comment A0564 of LB31Fred Vook

Mark CudakMotorola

C80216m-10/0434 3

Overview

• This “reply contribution” addresses the issue of the spacing between DRUs and the spacing between Sub-bands in the PHY structure

• Currently in the D4 Draft:– When few DRUs/Mini-bands are allocated (high DSAC value), they are spaced very

close together, which is not good for exploiting frequency diversity– When few Sub-bands are allocated (low DSAC value), they are spaced reasonably

far apart, which is good for frequency selective scheduling• Contribution 10/0044 / Comment A0564 proposes a modification to D4:

– 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 new formulas proposed in Contrib 0044– The modification is to add a simple right circular shift (by N1 PRUs) to the

formulas proposed in Contribution 10/0044– When few DRUs/Mini-bands are allocated (high DSAC value), they are spaced

reasonably far apart (same spacing as in Contribution 10/0044)– When few Sub-bands are allocated (low DSAC value), they are spaced reasonably

far apart.– All other spacings achieved in Contribution 10/0044 are preserved by this

modification

C80216m-10/0434 4

Current PHY Structure – D4

• 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

D4

Physical PRU

DS

AC

Red Squares = Sub-band-CRU

Blue Asterix = Mini-band-CRU

Green Diamonds = DRU

DSAC=9 or 10: DRUs are too close! (Bad) DSAC=2 or 3: Subbands

are far apart (Good)

C80216m-10/0434 5

PHY Structure – Contrib 10/0044 / Comment A0564

• 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




DSAC=2 or 3: Subbands are too close (Bad)

DSAC=9 or 10: DRUs are much better spaced than in D4 (Good)

C80216m-10/0434 6

Proposed Modification to Contrib 10/0044 / Comment A0564

• 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




DSAC=2 or 3: Subbands are better spaced than in D4 and Contribution 10/0044 (Good)

DSAC=9 or 10: DRUs have same spacing as in Contribution 10/0044 (Good)

C80216m-10/0434 7

Proposed Text Changes to D4 (1 of 4)

• [ Modify Equation 176 on page 375, starting on line 26 as follows: ]

}{ mod }{}{ mod})/,(

{ 111

1 NLjNN

KNNGCD

N

Lj

N

Lj

K

NNi MBsub

sub

SBsubsubMBMB

SB

sub

1,....,1,0];[][ SBSB LjiPRUjPRU

where

(176)

pruMBsubsub

SBsubsubsubMBMB

SBsub

sub NNLjNN

KNNNGCD

N

Lj

N

Lj

KN

NNNi ,}{ mod }{}{ mod}

))/(,({mod 1

1111

C80216m-10/0434 8



0 ;

0 };{ mod }{}{ mod})/,(

{ 111

1

SB

SBSBsubsub

SBsubsubSBSB

SB

sub

Kk

KNLkNN

KNNGCD

N

Lk

N

Lk

K

NN

i

0 ;

0 ;,}{ mod }{}{ mod}))/(,(

{mod 111

11

SB

SBprusubsub

SBsubsubsub

SBsub

sub

Kk

KNNkNN

KNNNGCD

N

k

N

k

KN

NNN

i

(178)

(178)

C80216m-10/0434 9



}{ mod }{}{ mod})/,(

{ 111

1 NjNN

KNNGCD

N

j

N

j

K

NNi sub

sub

SBsubsub

SB

sub

(233)

(233)

pruMBsubsub

SBsubsubsubMBMB

SBsub

sub NNLjNN

KNNNGCD

N

Lj

N

Lj

KN

NNNi ,}{ mod }{}{ mod}

))/(,({mod 1

1111

C80216m-10/0434 10



0 ;

0 };{ mod }{}{ mod})/,(

{ 111

1

SB

SBSBsubsub

SBsubsubSBSB

SB

sub

Kk

KNLkNN

KNNGCD

N

Lk

N

Lk

K

NN

i (235)

(235)

0 ;

0 ;,}{ mod }{}{ mod}))/(,(

{mod 111

11

SB

SBprusubsub

SBsubsubsub

SBsub

sub

Kk

KNNkNN

KNNNGCD

N

k

N

k

KN

NNN

i

Modifications to the Sub-band Partitioning Formulas (Reply to Comment A0564) IEEE 802.16...

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