1 Comparison of Variable and Fixed MCS for DL Unicast Service Control Channel Document Number: IEEE C80216m-08/1269 Date Submitted: 2008-10-31 Source:

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1 Comparison of Variable and Fixed MCS for DL Unicast Service Control Channel Document Number: IEEE C80216m-08/1269 Date Submitted: Source: Yi Hsuan, Hujun Yin, Roshni Srinivasan Intel Corporation Venue: IEEE Session #58, Dallas, US. Re: TGm SDD other Base Contribution: N/A Purpose: For TGm discussion. Notice: This document does not represent the agreed views of the IEEE 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 Patent Policy: The contributor is familiar with the IEEE-SA Patent Policy and Procedures: and. Further information is located at and.

2 Comparison of Fixed and Variable MCS for USCCH MCS distribution investigation –Users are randomly chosen one by one based on EMD cell geography. –Given a fixed amount power budget (denoted by P) and bandwidth budget (denoted by B), perform exhaustive search to accommodate the maximal user-specific control channels by assigning different MCSs and power adjustment to each users. –Examine the MCS distribution of the allocated users. Capacity investigation –Simulate and compare the control channel capacity using variable MCS and fixed MCS.

3 Simulation Setup Frequency reuse 1 scenario is considered Users are randomly chosen based on EMD baseline cell geography No more than 9 out 48 (B=18.75%) distributed LRUs are allowed 48 bits modulated and coded with QPSK ½ and CC. Modulated symbols are allocated to all 6 symbols of a subframe. The frequency occupation depends on the repetition factor. 2x2 antenna SFBC setup with MMSE channel estimation and MMSE MIMO receiver Channel model is eITU-Veh A at 120 km/hr SINR required for 1% PER is 2.5 dB, -0.6 dB, -3.4 dB, dB, for QPSK ½, rep 2, rep 4, rep 6 respectively 3 dB implementation loss and link adaptation margin is assumed Power boosting penalty is modeled and included Pilot vs. data tone boosting is 5 dB

4 What’s Not Covered in the Simulation The simulation is not system level simulation. It does not have a scheduler and any data traffic. Power boosting of control channels can change interference property to other cell. The impact due to interference change is not simulated.

5 MCS Distribution Investigation Power boosting scenario Power budget, P (BW budget=18.75%) % of total power % of total power % of total power 4 75% of total power % of total power

6 Control Channel Capacity Power boosting scenario Power budget, P (BW budget = 18.75%) % of total power % of total power % of total power 4 75% of total power % of total power