Considerations on the EMBS in 802 16 m

Considerations on the E-MBS in 802. 16 m : Physical Structure and MIMO Support IEEE 802. 16 Presentation Submission Template (Rev. 9) Document Number: IEEE S 802. 16 m-09/2052 Date Submitted: 2009 -08 -30 Source: Dongcheol Kim, Jin Sam Kwak, Han. Gyu Cho, Wookbong Lee Voice: +82 -31 -450 -1916 LG Electronic Inc. E-mail: dongcheol. kim@lge. com, wbong@lge. com samji@lge. com, xxx@lge. com LG R&D Complex, 533 Hogye-1 dong, Dongan-gu, Anyang, 431 -749, Korea *<http: //standards. ieee. org/faqs/affiliation. FAQ. html> Venue: IEEE 802. 16 m Session#63, Jeju, Korea Base Contribution: Purpose: 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: <http: //standards. ieee. org/guides/bylaws/sect 6 -7. html#6> and <http: //standards. ieee. org/guides/opman/sect 6. html#6. 3>. Further information is located at <http: //standards. ieee. org/board/pat-material. html> and <http: //standards. ieee. org/board/pat >.

Overview • In current document(SDDrxx), – 11. 5. 3. 2 E-MBS Zone Specific Pilot for MBSFN …The E-MBS zone specific pilots depend on the maximum number of Tx streams within the E-MBS zone. Pilot structures/patterns should be supported up to two Tx streams. The definitions of the E-MBS zone specific pilots are being studied. § The required pilot density and patterns for MIMO supports in both the time domain and the frequency domain are proposed. 2

Pilot Overhead and Pattern Design for E-MBS • The frequency selectivity of MBSFN channels is usually subject to the larger delay spread of the equivalent SFN channels than that of the unicast channels. • This implies that the pilot density for MBSFN resource blocks should be higher than that of unicast resource blocks

Text Proposal for the 802. 16 m SDD Figure A Proposed Pilot Structure A : Pilot Overhead -8. 3% Figure B Proposed Pilot Structure B : Total Pilot Overhead - 18. 50%

APPENDIX • Simulation result

Simulation Results 8. 3% pilot pattern and Pattern A in SDD, SM are used in this simulation set up. This is worst case scenario for 4 PRU CE, which is miniband CRU for 1 PRU CE and subband CRU for 4 PRU CE. About 1 d. B performance difference is shown at 1% BLER.

Pilot pattern used in simulation • Pattern A in SDD: Unicast pilot pattern (2 -stream) • Pilot Pattern : overhead 8. 3% per stream

Simulation parameters OFDM Parameters FFT Size 1024 (10 MHz) CP = 1/8 Tu Channel model MBSFN channel for ISD 1. 5 km, MS Speed = 3 kmph or 120 kmph CE parameters 2 -D MMSE, Window size = 1 PRU or 4 PRU, SNR, Doppler, Delay spread were known Pilot Pattern SDD unicast 2 -stream pilot pattern Data Size 4 LRU Permutation DRU for both or 4 PRU Channel estimation – Subband CRU, 1 PRU Channel estimation - Miniband based CRU MIMO mode 2 Tx, 2 Rx, SFBC or Rate-2 SM MIMO Detector Soft MMSE detector MCS 16 QAM ½ or ¾ with LTE-FEC with 8 -iteration decoding Pilot Boosting 0 d. B