EMBS Multiplexing with Unicast 16 2 3 29

E-MBS Multiplexing with Unicast (16. 2. 3. 29, 16. 3. 5. 6, 16. 3. 6. 5. 3, & 16. 9. 3. 1) Document Number: IEEE C 802. 16 m-10/0383 Date Submitted: 2010 -03 -05 Source: Jong-kae Fwu Yujian Zhang jong-kae. fwu@intel. com yujian. zhang@intel. com Intel Corporation Re: Venue: Comments on IEEE P 802. 16 m/D 4 for IEEE 802. 16 Working Group Letter Ballot Recirc # 31 / Topic: E-MBS (Section 16. 2. 3. 29, 16. 3. 5. 6, 16. 3. 6. 5. 3, & 16. 9. 3. 1) IEEE Session#66, Orlando Base Contribution: C 802. 16 m-10_0382. doc (or later versions) Purpose: Discussion and Adoption by TGm 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 >. 1

Introduction • FDM multiplexing between E-MBS and unicast was agreed in 16 m. • For FDM multiplexing, there are two ways to implement this: – Pure FDM multiplexing, i. e. E-MBS is present in all DL subframes (resources colliding with SFH) – Hybrid FDM/TDM multiplexing: E-MBS is only present in the last n DL subframes of one frame, and n is indicated as 3 bit EMBS_SUBFRME_INDICATOR • Issues/Considerations: – Resource Granularity – UL Feedback 2

Resource Granularity Discussion • The claimed benefit of hybrid FDM/TDM is that the granularity for resource allocation is finer, however this is not the case if we allow unicast transmissions within the allocated E-MBS resources. • If remaining resources in E-MBS cannot be used for unicast, granularity of hybrid FDM/TDM is quite large when MSI is large: – Even if we use 1 subframe per frame, the granularity is 8 subbands for 40 ms MSI, and 64 subbands for 320 ms MSI. • When remaining resources in E-MBS can be used for unicast, granularity of pure FDM and hybrid FDM/TDM is same, i. e. one subband. 3

UL Feedback Discussion (1) • Two UL feedback options: a) all subbands, b) subband excluding EMBS – Option 1) To allow ALL subbands for UL feedback • [Pros] E-MBS subband CQI is available for better subband scheduling • [Cons] MIMO Performance degraded due to the waste of subband CQI – Option 2) allow only available subbands which excludes E-MBS subbands • [Pros] No MIMO performance degradation • [Cons] Conservative use of E-MBS subband for unicast due to unknown CQI • UL feedback should be optimized for unicast operation – should NOT degrade MIMO performance in regular mode – The use of EMBS subband for unicast is good to have, but the system is not optimized to support such limited cases – The EMBS region should not be aggressively over-provision which will decrease the efficiency 4

UL Feedback Discussion (2) • Conclusions after considering both Resource Granularity and UL feedbacks issues : – Pure FDM multiplexing is preferred combined with option 2 of subband feedback – Option 2 is preferred solution which optimize for the most general usage cases while support conservative use of E-MBS subband for unicast – The E-MBS subband information may need to be modified such that all MSs can easily access to such information without the need to decode all other E-MBS configuration information. 5