3GPP2 A TITLE: TITLE: Simulation Results for HRPD SCML with feedback sharingSOURCE Satish Kanugovi, Alcatel-Lucent, Sendil Kumar, RITCOE, Yonggang Fang, ZTE Corp., Xiaowu Zhao, ZTE Corp., This contribution provides a set of results for HRPD simulations with feedback sharing RECOMMENDATION : Discuss and adopt in principle. © 2011 The contributors grants a free, irrevocable license to 3GPP2 and its Organizational Partners to incorporate text or other copyrightable material contained in the contribution and any modifications thereof in the creation of 3GPP2 publications; to copyright and sell in Organizational Partner's name any Organizational Partner's standards publication even though it may include all or portions of this contribution; and at the Organizational Partner's sole discretion to permit others to reproduce in whole or in part such contribution or the resulting Organizational Partner's standards publication. contributors is also willing to grant licenses under such contributor copyrights to third parties on reasonable, non-discriminatory terms and conditions for purpose of practicing an Organizational Partner's standard which incorporates this contribution. This document has been prepared by contributors to assist the development of specifications by 3GPP2. It is proposed to the Committee as a basis for discussion and is not to be construed as a binding proposal on contributors. contributors specifically reserves the right to amend or modify the material contained herein and to any intellectual property of contributors other than provided in the copyright statement above.

2 Single carrier multilink overview Simulation methodology Simulation results Outline

3 Legacy HRPD operation

4 SCML in HRPD – No feedback sharing

5 Advantages of feedback sharing in SCML

6 #DESCRIPTIONPARAMETER 1Cell Layout7-cells, 21 sectors Large scale terrain modelUrban Macro, (COST 231 from 3gpp2) Tx Power, Height, Antenna Tilt, Antenna Gain40 dBm, 32m, 4degree, 15dB Inter Site Distance1.2 km UE Height1.5m 2Carrier frequency (fc)2GHz 3No. of carrier per sectors1 (1.25MHz) 4Maximum allowed active users/sector20 5No. of Active SCML connections per user2 6T_ADD between active connection to enable SCML6dB 7Fast Fading Channel Models between Tx and Rx3GPP2 Channel Mixer 3GPP2 C.R1002-B Evaluation Methodology Simulation assumptions

7 #DESCRIPTIONPARAMETER 8Fast SCML Source Switching Disabled UE does not change the SCML sources. 9SchedulerProportional Fair (Independent at each Sector) 10Proposed Schemes to be compareda). Baseline - Independent (PF) schedulers at the SCML sources b). Centralized PF Scheduler between SCML sources with full knowledge with infinite bandwidth for co-operation c). Limited information Exchange between two schedulers (Average Throughput, Average DRC at specified periodicity) Simulation assumptions

Simulation Results

9 Baseline SCML – without sharing SCML – with Instantaneous sharing of feedback SCML with Feedback sharing Periodicity -> 100 slots – 167 ms Periodicity -> 200 slots – 334 ms Periodicity -> 300 slots – 501 ms Periodicity -> 400 slots – 668 ms Scenarios

10 baselinescmlInst. sharing Per 100 slots Per 200 slots Per 300 slots Per 400 slots SCML_c nonScml_c Cell_c SCML_all NonSCML_all Cell_all Comparison of throughputs Legend: The numbers compared are MAC layer throughputs in kbps

11 (Percentages) baselinescmlInst. sharing Per 100 slots Per 200 slots Per 300 slots Per 400 slots SCML_c nonScml_c Cell_c SCML_all NonSCML_all Cell_all Comparison of gains

12 Consolidated view

13 SCML leads to gain for cell-edge users that get into SCML mode Non SCML users suffers losses during SCML operation with no coordination – cost of gain for cell-edge users Losses to SCML users can be mitigated by feedback sharing Operators can take advantage of feedback sharing to balance gains between the non-scml and scml users The gains due to feedback sharing at different periodicities is approximately same as with instantaneous throughput sharing Operators can tune the feedback sharing periodicity based on considerations of backhaul requirements Discussion and Summary