1. 1 Modifications on Subband (SB) Partitioning Equations (16.3.5.2.1 and 16.3.8.2.1) IEEE 802.16 Presentation Submission Template (Rev. 9) Document Number: IEEE C80216m-09_2828 Date Submitted: 2009-12-30 Source: HanGyu Cho {hgcho}@lge.com{hgcho}@lge.com LG Electronics Re: Comments on P802.16m/D3 for recirculation #30b Purpose: To be discussed and adopted into P802.16m/D3 by WG LB Notice: This document does not represent the agreed views of the IEEE 802.16 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 802.16. Patent Policy: The contributor is familiar with the IEEE-SA Patent Policy and Procedures: and.http://standards.ieee.org/guides/bylaws/sect6-7.html#6http://standards.ieee.org/guides/opman/sect6.html#6.3 Further information is located at and.http://standards.ieee.org/board/pat/pat-material.htmlhttp://standards.ieee.org/board/pat

2. 2 Problem Statement  DRUs are used for transmission of control (A- MAP in DL and FBCH in UL) as well as data.  It is essential to assign PRUs for DRU allocation having enough diversity  In P802.16m/D3, minimum number of PRUs allocated to DRU is 8 (2 SBs) for 5/10 MHz and 12 (3 SBs) for 20MHz (1 SB allocation for DRU is already excluded.)  When 2 SBs are allocated to DRU, they are placed closely, which may be poor in terms of diversity for some channel conditions  How can we simply improve it?

3. 3 Current SB/MB Partitioning Rule (10MHz case) DSAC=1 2 3 4 5 6 7 8 9 10 DSAC=1 2 3 4 5 6 7 8 9 10 Subband (SB)Miniband (MB) DRUs are too close

4. 4 Proposal Exchange between SB allocation method and MB allocation method in SB partitioning section

5. 5 Proposed SB/MB Partitioning Rule (10MHz case) DSAC=10 9 8 7 6 5 4 3 2 1 Subband (SB)Miniband (MB) DSAC=10 9 8 7 6 5 4 3 2 1 DRUs are not close Even when DSAC is small, frequency selectivity loss is negligible due to multi-user diversity

6. 6 Proposed Text Modify the text from line 53, page 318 to line 10, page 319 of P802.16m/D3 as follows: -----------------------------------------Text start--------------------------------------------------------- (176) where (177) (177) (178) where (178) (179) ----------------------------------------------------- Text end----------------------------------------------------------

7. 7 Proposed Text Modify the text from line 1 to 22, page 493 of P802.16m/D3 as follows: -----------------------------------------Text start--------------------------------------------------------- (232) where (233) (234) where (235) ----------------------------------------------------- Text end----------------------------------------------------------