Frame Structures for Legacy-Support and Legacy-Support Disabled Modes IEEE 802.16 Presentation Submission Template (Rev. 9) Document Number: IEEE S802.16m-08/243.

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Frame Structures for Legacy-Support and Legacy-Support Disabled Modes IEEE Presentation Submission Template (Rev. 9) Document Number: IEEE S802.16m-08/243 Date Submitted: Source: Sungho Moon and Jin Sam KwakVoice: LG Electronics Chongli Liu, Mingyang Sun, Xin Chang, Sean McBeath Huawei Technologies CO., LTD. * Venue: Re : Proposed m Frame Structure Baseline Content Suitable for Use in the m SDD (C802.16m-08/118r1) Base Contribution: IEEE C802.16m-08/243 Purpose: Proposed m Frame Structure Baseline Content Suitable for Use in the m SDD (C802.16m-08/118r1) 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.

Basic OFDM Parameters Considerations –Without physical layer impacts on the legacy system –The same parameters : Sampling frequency, FFT sizes, and sub-carrier spacing –Different parameter : CP length Transmission Bandwidth (MHz)51020 Sampling Frequency (MHz) FFT Size Sub-Carrier Spacing (kHz)10.94 Tu (us)91.4 UsageCyclic Prefix (CP)Ts (us) OFDM Symbols per Frame Idle Time (us) Legacy Support Mode / 16m MBS Tg=1/8 Tu = Legacy Support-Disabled 16m Mode Tg=1/16 Tu =

Motivations of 1/16 Tu CP Wireless Channel Models CP Lengths of Other Systems –LTE : 4.69 us and 5.21 us in a sub-frame (7 % overhead) –UMB : 6.51 us as a default CP length (6 % overhead) –Reference system : us (=1/8 Tu) (12.5 % overhead) Channel ModelMean Delay Spread (ns)RMS Delay Spread (ns)Max. Delay Spread (us) Pedestrian A Pedestrian B Vehicular A TU 6-ray Model

Normal CP Lengths Normal CP Length For Legacy-Support Mode –The same as that of the reference system, i.e., us which is 1/8 of an OFDM symbol (Tu) Normal CP length For Legacy-Support Disabled Mode –A CP length of 1/16 Tu –Proper size to support ordinary channel conditions without loss in spectral efficiency Advantages of the CP Length of 1/16 Tu (= 5.71 us) –Less than 10% CP overhead loss –51 OFDM symbols per frame = Better spectral efficiency ( ~6%) –Additional gain from appropriate usages of the 3 OFDM symbols, e.g., preamble, midamble, control, sounding, and etc. Other Short or Long CP Lengths –Can be considered for extraordinary cases

Basic Frame Structure

Frame Structure for Legacy-Support Mode

Frame Structure for Legacy-Support Disabled Mode

Coexistence Btw. Legacy-Support and Legacy- Support Disabled Modes

Proposed Structure for Legacy-Support Disabled Mode Sub-Frame TypeType-1Type-2Type-3 CP LengthDL:ULSub-Frame Index 1/8 Tu (4:4)0, 1, 2, 4, 5, 6, and 73N/A (5:3)0, 1, 2, 3, 5, 6, and 74N/A (6:2)0, 1, 2, 3, 4, 6, and 75N/A (7:1)0, 1, 2, 3, 4, 5, and 76N/A 1/16 Tu (4:4)1, 2, 3, 4, 5, and 6N/A0 and 7 (5:3)1, 2, 3, 4, 5, and 6N/A0 and 7 (6:2)1, 2, 3, 4, 5, and 6N/A0 and 7 (7:1)1, 2, 3, 4, 5, and 6N/A0 and 7 Advantages –Increased spectral efficiency (6%) –No problem to coexist with 16m systems operating with a 1/8 CP length –Commonality with structures of a CP length of 1/8 Tu, Number of sub-frames per frame, i.e., 8 sub-frame per frame Number of OFDM symbols per sub-frame, e.g., 5, 6, and 7 OFDM symbols per subframe Unified TDD Configuration for Both CP Cases

Proposed Text on C802.16m/118r OFDM Parameters [Add a CP length option into Table (proposal-1) in C802.16m-08/118r1 as follows:] Nominal Channel Bandwidth (MHz) Over-sampling Factor28/258/7 28/25 Sampling Frequency (MHz) FFT Size Sub-Carrier Spacing (kHz) Tu (us) Cyclic Prefix (CP)Ts (us)Number of OFDM Symbols per FrameIdle Time (us) Tg=1/8 Tu = (for 5, 10, 20 MHz) 48 (for 5, 10, 20 MHz) =144 (for 7 MHz) 34 (for 7 MHz) =115.2 (for 8.75 MHz) 43 (for 8.75 MHz)46.40 Tg = 1/16 Tu = (for 5, 10, 20 MHz) 51 (for 5, 10, 20 MHz)47.39 [Table : OFDM parameters for IEEE m]  proposal-1 * Other CP, e.g., 1/32 Tu or 1/4 Tu, can be considered in the 16m numerology.

Proposed Text on C802.16m/118r1 (cont’d) Basic Frame Structure (proposal-1) [Replace Figure (proposal-1) in C802.16m-08/118r1 with the following figure] Figure : Basic frame structure

Proposed Text on C802.16m/118r1 (cont’d) [Replace Figure (option1) in C802.16m-08/118r1 with the following figure] Figure : TDD and FDD Frame Structures with a CP of 1/8 Tu (DL to UL ratio of 5:3)

Proposed Text on C802.16m/118r1 (cont’d) [Replace Figure (option1) in C802.16m-08/118r1 with the following figure] Figure : TDD and FDD Frame Structure with a CP of 1/16 Tu (DL to UL ratio of 5:3)