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Design of the “Resource Allocation” field in the Basic Assignment A-MAP IEs for the case of sub-band CRU allocations : Simulation results, Insights & Methodology.

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Presentation on theme: "Design of the “Resource Allocation” field in the Basic Assignment A-MAP IEs for the case of sub-band CRU allocations : Simulation results, Insights & Methodology."— Presentation transcript:

1 Design of the “Resource Allocation” field in the Basic Assignment A-MAP IEs for the case of sub-band CRU allocations : Simulation results, Insights & Methodology Document Number: IEEE C80216m-09_0917 Date Submitted: 2009-04-27 Source: Sudhir Ramakrishna E-mail:sudhir.r@samsung.comsudhir.r@samsung.com Zhouyue Pi Youngbo Cho Samsung Electronics Venue: Re: 802.16m amendment working document Category: AWD Comments Area: Chapter 15.3.6 (DL Control) Base Contribution: IEEE C80216m-09_0917 Purpose: To be discussed and adopted by TGm for the 802.16m AWD 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: and.http://standards.ieee.org/guides/bylaws/sect6-7.html#6http://standards.ieee.org/guides/opman/sect6.html#6.3 Further information is located at and.http://standards.ieee.org/board/pat/pat-material.htmlhttp://standards.ieee.org/board/pat

2 IEEE C80216m-09_0917 Slide #2 Associated AWD Text Proposals Contributions C80216m-09_0919 & C80216m-09_0918 provide suggested AWD text defining the usage of the “Resource Allocation” field in the DL/UL Basic Assignment A-MAP IE, for the case of allocation of sub- band-based CRU resources, for a 10 MHz system C80216m-09_0918 provides the AWD text defining the structure & interpretation of the “Resource Allocation” field itself, and the interpretation of the associated IEs, for the case of allocation of sub-band-based CRU resources C80216m-09_0919 provides associated text defining some values for the “IE Type” field in the A-MAP IEs, which are required to complete the definition of the usage of the “Resource Allocation” field Summary of this Contribution This contribution provides some of the reasoning behind the detailed design of the “Resource Allocation” field in the DL/UL Basic Assignment A-MAP-IE for sub-band-based CRUs

3 IEEE C80216m-09_0917 Slide #3 DL System Level Simulation Results Motivating the Design of the “Resource Allocation” field for Sub-band-based CRU Resources

4 IEEE C80216m-09_0917 Slide #4 DL System Level Simulation Summary 10 MHz FDD DL system  Total of 48 PRUs, 8 DL sub-frames per 5ms frame, Sub-band CRUs only Full blown system-level simulator - 57 sectors with wrap-around, 10 users per sector (hence 570 users total), all action modeled in all sectors 2 uncorrelated transmit antennas at each sector, 2 uncorrelated receive antennas at each mobile Channel modeling Each sector-antenna to mobile-antenna link modeled by a 24-tap model (2 cases - EMD Modified Ped B, 3 Kmph model & EMD Modified Vehicular A, 30 Kmph model) CQI/PMI calculation, once every frame For each mobile, “best” PMI/# of streams/LMMSE CQI calculated for each sub-band Calculation takes into account precoding being used in all interfering sectors (hence “flashlight” effect captured) “Best”  based on exhaustive search over all pre-coders/# of streams Using the 3-bit 16e rank1 and rank 2 codebooks Scheduling, every sub-frame For each mobile, a priority is assigned to each sub-band based on the PF metric, using the CQI for the sub-band Mobiles are assigned sub-bands in priority order; no limit on # of sub-bands per-mobile per-sub-frame MCS selection driven by average CQI across all assigned sub-bands, re-transmissions use same MCS Currently using the LTE TFs (9 MCSs) Packet performance evaluation : LMMSE SINR formula takes interference from all sectors  feeds into EESM method for packet success/failure determination More details in Appendix

5 IEEE C80216m-09_0917 Slide #5 # of sub-bands per-average-mobile per-sub-frame statistics, 1/2 Statistic logged During the simulation, for each mobile, record the number of times X sub-bands were assigned, X = 1 to 12 For mobile i, let n i (X) be the # of times X sub-bands were assigned, X = 1 to 12 At the end of the simulation, for each value of X sub-bands (X = 1 to 12), calculate the # of occurrences over all mobiles N(X) = ∑ n i (X), where the sum is taken over all mobiles in the system Then, calculate the PDF of the assignment of X sub-bands (X = 1 to 12) to an “average” mobile as p(X) = N(X)/{ N(1) + N(2) + N(3) + … + N(12) } This statistic gives us insight into the # of sub-bands that are assigned most often

6 IEEE C80216m-09_0917 Slide #6 # of sub-bands per-average-mobile per-sub-frame statistics, 2/2 Insights Assignment of a small number of sub-bands dominates the set of assignments Assignment of <= 2 sub-bands accounts for ~ 84% and 77% of all assignments in PedB3 and VehA30, respectively Assignment of <=3 sub-bands accounts for ~94% and 87% of all assignments in PedB3 and VehA30, respectively

7 IEEE C80216m-09_0917 Slide #7 Contiguous vs non-countiguous sub-band assignments, 1/2 Statistic logged During the simulation, for each mobile, whenever it is assigned X > 1 sub-bands The X sub-bands are selected from the PF algorithm and are, in general, non-contiguous The MCS assigned is driven by the average CQI over the X sub-bands; let this value be CQI_avg_actual Calculate the average CQI over X sub-bands, if the X sub-bands were chosen to have logically contiguous indices, starting from the sub-band with lowest logical index in actual assignment. Let this value be CQI_avg_contiguous Log the ratio CQI_avg_actual/ CQI_avg_contiguous for each value of X, X = 2 to 12 At the end of simulation, for each mobile, calculate the average value of CQI_avg_actual/ CQI_avg_contiguous for each value of X, X = 2 to 12 Plot the CDF of this average ratio, for various values of allocated sub-bands X. This statistic yield insights into the importance of designing the IEs to allow for non-contiguous (w.r.t logical indices) sub-band assignments

8 IEEE C80216m-09_0917 Slide #8 Contiguous vs non-contiguous sub-band assignments, 2/2 Insights The gain of non-contiguous allocations (over contiguous allocations) does not appear to be large Caveat 1 : More frequency selective channel models may yield different results Caveat 2 : In PedB3, between 10% (for 2 sub-band allocations) and 30% (for 3/4/5 sub-band allocations) of the users see CQI ratios larger than 1 dB (corresponding fractions for VehA30 are much larger) The SINRs corresponding to the 1% FER point in the MCSs in the16m MCS table are planned to be ~ 1dB apart Hence, contiguous allocations in these cases would lead to lower MCSs being selected and lower throughputs Caveat 3 : The instantaneous ratio in any assignment could be larger than the average (which is plotted in CDF) Gains of non-contiguous allocations seem “surer” (narrower CDF) for smaller number of assigned sub-bands Reason – When assigning larger # of sub-bands, less chance of getting the highest PF priority non-contiguous sub-bands

9 IEEE C80216m-09_0917 Slide #9 Common MCS vs different MCSs across allocated sub-bands, 1/2 In the simulation, a common MCS is used across all allocated sub-bands MCS selection driven by average CQI across allocated sub-bands Statistic logged During the simulation, for each mobile, whenever it is assigned X > 1 sub-bands Calculate the ratio of the CQI in each sub-band to the average CQI over all sub-bands that is used to select the MCS, and log the largest of these ratios. Associate this ratio with the assignment of X sub-bands At the end of the simulation, for each mobile, for each value of allocated sub-bands X, X = 1 to 12, calculate the average of these ratios Plot a CDF of these average ratios for the various mobiles, for various values of allocated sub-bands X This statistic yield insights into how well the average CQI across a set of sub-bands represents the CQIs in each of the component sub-bands.

10 IEEE C80216m-09_0917 Slide #10 Common MCS vs different MCSs across allocated sub-bands, 2/2 Insights When smaller # of sub-bands (2, 3) are allocated, the average CQI across sub-bands is close to the individual sub- band CQIs When a larger # of sub-bands is allocated, significant deviation of sub-band CQI from the average However, from previous result, a small # of sub-bands (1/2/3) is most likely to be allocated Hence, a common MCS across sub-bands, based on the average CQI across sub-bands, should suffice

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