1 Subchannelization for supporting Open-Loop Region Types 0 and 1 IEEE 802.16 Presentation Submission Template (Rev. 9) Document Number: IEEE C80216m-10/0018.

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1 Subchannelization for supporting Open-Loop Region Types 0 and 1 IEEE Presentation Submission Template (Rev. 9) Document Number: IEEE C80216m-10/0018 Date Submitted: Source: David Mazzarese, Taeyoung Kim, Sudhir Ramakrishna Heewon Kang, Hokyu Choi Samsung Electronics Venue: IEEE m Session#65, San Diego, US Re:IEEE m-09/0058r4: Letter Ballot Recirc #30b Base Contribution: IEEE C80216m-09/2942 Purpose: Discussion and approval 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.

2 Support of Open-Loop Regions with Distributed Allocations OL region type 0 in DLRUs –DLRUs must be aligned across cells in FP0 OL region type 1 in NLRUs (minibands) –NLRUs must be aligned across cells in FP0 Problem in D3 –Cell-specific CRU/DRU allocation (eq 194 in D3) results in unavoidable collisions of DLRUs in one cell with NLRUs in another cell

3 DL Subchannelization (D3, Eq 194) 3 A type of cell-specific miniband permutation Direct mapping CRU/DRU allocation partition 0

4 Cell-specific CRU/DRU allocation Purpose of cell-specific CRU/DRU allocation (eq 194 in D3) –When subbands are taken from cell-common subbands for use in NLRU, PRUs must be permuted for frequency diversity. –This also provides interference randomization in the NLRU Problem with OL regions type 0-DLRU and 1-NLRU –The physical PRUs assigned to NLRU and DLRU are not aligned across cells because of the cell-specific CRU/DRU allocation (equation 194 in D3) –Even if the numbers of subbands (SLRU) and minibands (NLRU) are equal in frequency partition 0 across all cells

5 Proposal in C802.16m-09/C SFH bit: cell specific or common miniband permutation Direct mapping CRU/DRU allocation partition 0

6 Proposal in C802.16m-09/C2728r1

7 Analysis C802.16m-09/C2942 –Cell-specific or common permutation configured in SFH by ABS –No difference with D3 when there is no OL region type 0 or 1 –Only drawback: loss of interference randomization in NLRUs in FP0 when OL region type 0-DLRU is present –So we recommend no NLRU in FP0 when OL region type 0 is present, or to have OL regions types 0 and 1 simultaneously C802.16m-09/C2728r1 –Change to D3 results in loss of frequency diversity in NLRUs in FP0 even when OL region is not present –Feature of 16m to dynamically adjust the SLRU/NLRU resources is basically made useless by this change of permutation –Loss of frequency diversity in NLRUs defeats the purpose of minibands

8 Conclusion Recommend to adopt the text proposal in C802.16m-09/C2942 or its latest revision.