3GPP2 A xxx TITLE: TITLE: Simulation Results for HRPD SCML with feedback sharingSOURCE Satish Kanugovi, Alcatel-Lucent, Mike Dolan, Alcatel-Lucent, Sendil Kumar, RITCOE, Yonggang Fang, ZTE Corp., Xiaowu Zhao, ZTE Corp., ABSTRACT: 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, wrap-around 2Large scale terrain modelUrban Macro, (COST 231 from 3gpp2) 3Tx Power, Height, Antenna Tilt, Antenna Gain40 dBm, 32m, 4degree, 15dB 4Inter Site Distance1.2 km 5UE Height1.5m 6Carrier frequency (fc)2GHz 7No. of carrier per sectors1 (1.25MHz) 8Maximum allowed active users/sector20 9 AT distributionSpatially Uniform distribution across the cell 10 AT numbers across cells Heavily loaded cell: 20 ATs per sector Lightly loaded cell: 8 ATs per sector 1 Cell is heavily loaded, Remaining cells are lightly loaded. 11 AT mobilityVehicular speeds distribution per the 3GPP2 evaluation methodology, C.R1002-B 12Max. forward links per user in SCML mode2 13T_ADD between active connection to enable SCML6dB Simulation assumptions - 1

7 #DESCRIPTIONPARAMETER 14Fast Fading Channel Models between Tx and Rx 3GPP2 Channel Mixer 3GPP2 C.R1002-B Evaluation Methodology 15SCML Source Switching Disabled AT does not change the SCML sources. 16Traffic profileFull Buffer 17SchedulerProportional Fair (Independent at each Sector) 18Proposed Schemes to be compared Baseline(Independent (PF) schedulers at the SCML sources) PF_metric(n) = R(n)/A(n), for the nth slot R (n) = Requested Rate based on DRC applicable at the nth slot A(n) = Avg. throughput delivered to the AT at the nth slot SCML with instantaneous throughput exchange PF_metric(n) = R(n)/A(n), for the nth slot R (n) = Requested Rate based on DRC applicable at the nth slot A(n) = A(n) + A r (n) A r (n) = Received value of Avg. Throughput delivered to the AT through the other sector SCML with periodic throughput exchangePF_metric(n) = R(n)/A(n), for the nth slot R (n) = Requested Rate based on DRC applicable at the nth slot A(n) = A(n) + A r (x), x = floor(n/p) where p is periodicity of exchange A r (n) = Received value of Avg. Throughput delivered to the AT through the other sector Simulation assumptions - 2

Simulation Results

9 Throughput for each AT, t(u) = (Total Bits delivered)/ (Duration of simulation), where u - AT1, AT2,.. Throughput metric, T = mean(t(u)) AT Load distribution across cells is as follows o 1 Cell is heavily loaded (HL) (here cell_1 is HL) o Remaining 6 cells are lightly loaded (LL) Throughput metric(T) is evaluated for different sets of ATs 1. T(SCML ATs) in HL cells 2. T (Non-SCML ATs) in HL cells 3. T (All ATs) in HL cells 4. T(SCML ATs) in All cells 5. T (Non-SCML ATs) in All cells 6. T (All ATs) in All cells Understanding the results

10 Baseline – No SCML, Single carrier Rev-A EVDO operation 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) Scenarios

11 Throughput metrics (in Kbps) Baseline (kbps) SCML without throughpu t sharing (kbps) SCML with Inst. Sharing (kbps) % gain -SCML with no sharing (%) % gain -SCML with instantaneo us sharing (%) SCML ATs in Cell_ Non-SCML ATs In Cell_ All ATs In Cell_ SCML ATs (across all cells) Non-SCML ATs (across all cells) All ATs (across all cells) Gains due to throughput sharing with SCML

12 Throughput metrics (in Kbps) SCML without throughpu t sharing (kbps) SCML with Inst. Sharing (kbps) Change due to sharing (kbps) Change due to sharing (%) SCML ATs in Cell_ Non-SCML ATs In Cell_ All ATs In Cell_ SCML ATs (across all cells) Non-SCML ATs (across all cells) All ATs (across all cells) Impact of throughput sharing with SCML

13 Comparison of throughput metrics 1.Gains for SCML ATs in Cell_1 (HL Cell) is higher compared to the gain of SCML ATs averaged over the entire network 2.Without throughput sharing, Non-SCML ATs suffer losses w.r.t to the baseline 3.With throughput sharing, Loss to Non-SCML ATs is reduced significantly Minor reduction in gains to SCML ATs.

14 Throughput metric, T (in kbps) Baseline (kbps) SCML without throughput sharing (kbps) Inst. Sharing (kbps) p = 100 slots, ~167 ms (kbps) p = 200 slots, ~334ms (kbps) p = 300 slots, ~501 ms (kbps) SCML ATs in Cell_ Non-SCML ATs In Cell_ All ATs In Cell_ SCML ATs (across all cells) Non-SCML ATs (across all cells) All ATs (across all cells) Comparison of throughput metrics with periodicity, p = 100, 200, 300 slots

15 Comparing throughput metrics for throughput sharing at different periodicities

16 (Percentage gains as compared to baseline) SCML without throughput sharing (%) Inst. Sharing (%) Per 100 slots, ~167 ms (%) Per 200 slots, ~334 ms (%) Per 300 slots, ~501 ms (%) SCML ATs in Cell_ Non-SCML ATs In Cell_ All ATs In Cell_ SCML ATs (across all cells) Non-SCML ATs (across all cells) All ATs (across all cells) Comparison of percentage gains with periodicity, p = 100, 200, 300 slots

17 SCML leads to gain for cell-edge users (that can get into SCML mode) Non-SCML users suffer losses during SCML operation – cost of gain for cell-edge users Losses to Non-SCML users can be mitigated by feedback sharing Feedback sharing can be used to balance gains between the Non-SCML and SCML users The gains to SCML users due to feedback sharing at different periodicities are comparable same as with instantaneous throughput sharing Feedback sharing periodicity can be tuned based on considerations of backhaul requirements Discussion and Summary

18 Thanks