Improvements to the Sub-band Partitioning Formulas IEEE 802.16 Presentation Submission Template (Rev. 9) Document Number: C802.16m-10/0749 Date Submitted:

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Improvements to the Sub-band Partitioning Formulas IEEE Presentation Submission Template (Rev. 9) Document Number: C802.16m-10/0749 Date Submitted: Source: Fred Vook, Mark Cudak, Bill Hillery, Eugene Visotsky, Anup Motorola * Venue: Session #68 – San Diego Meeting Re: P802.16m/D6 comments for Sponsor Ballot Area: Section – DL PHY Structure Section – 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: This document does not represent the agreed views of the IEEE Working Group or any of its subgroups. It represents only the views of the participants listed in the “Source(s)” field above. It is offered as a basis for discussion. It is not binding on the contributor(s), who reserve(s) the right to add, amend or withdraw material contained herein. Release: The contributor grants a free, irrevocable license to the IEEE to incorporate material contained in this contribution, and any modifications thereof, in the creation of an IEEE Standards publication; to copyright in the IEEE’s name any IEEE Standards publication even though it may include portions of this contribution; and at the IEEE’s sole discretion to permit others to reproduce in whole or in part the resulting IEEE Standards publication. The contributor also acknowledges and accepts that this contribution may be made public by IEEE Patent Policy: The contributor is familiar with the IEEE-SA Patent Policy and Procedures: and. Further information is located at and.

C80216m-10/ 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/ Current PHY Structure – D6 Draft DSAC=0:1:10 DCAS_sb0=DSAC DFPC=0 DFPSC=0 DCAS_mb0=0 DCASi=0 IDCell=2 DSAC=2 or 3: Subbands are too close (Bad) DSAC=9 or 10: DRUs are reasonably spaced (Good)

C80216m-10/ Proposed Modification DSAC=0:1:10 DCAS_sb0=DSAC DFPC=0 DFPSC=0 DCAS_mb0=0 DCASi=0 IDCell=2 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/ Proposed Text Changes to D6 (1 of 4) [ Modify Equation 180 on page 462, starting on line 26 as follows: (N 1 is added to the original equation and the result is found mod N pru.)] where (180)

C80216m-10/ Proposed Text Changes to D6 (2 of 4) [ Modify Equation 181 on page 462, starting on line 42 as follows: (N 1 is added to the original equation and the result is found mod N pru.)] where (181)

C80216m-10/ 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 (K SB -N sub has been changed to N sub -K SB ). Also, N 1 is added to the original equation and the result is found mod N pru.] where (256)

C80216m-10/ 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 (K SB -N sub has been changed to N sub -K SB ). Also, N 1 is added to the original equation and the result is found mod N pru.] where (257)