TDD frame structure for 802.16m with legacy support IEEE 802.16 Presentation Submission Template (Rev. 9) Document Number: IEEE S80216m-07/215r1 Date Submitted:

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TDD frame structure for m with legacy support IEEE Presentation Submission Template (Rev. 9) Document Number: IEEE S80216m-07/215r1 Date Submitted: Source:Zexian Li Nokia Xin Qi ), Shashikant Maheshwari ), Adrian Boariu Nokia Siemens Networks Venue: IEEE Session #53, Levi, Finland Base Contribution: IEEE C80216m-07/215r1 Purpose: The purpose of this slide set is to introduce our contribution. 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.

Motivation According to m SRD: –802.16m shall provide continuing support and interoperability for legacy WirelessMAN-OFDMA, where the legacy WirelessMAN- OFDMA refers to WiMAX Forum Mobile System Profile, Release 1.0 (Revision 1.4.0: ). –Data latency reduction is among 16m requirements as well. Obviously there will be no problem if the legacy BS and 16m BS are operating on different carrier frequencies. We consider the scenarios where the same BS is used to support both 16e MSs and 16m MSs with the same carrier frequency.

Key features of proposal Fully backwards compatibility without any legacy performance degradation Extend current e frame to have one or more m zones in both DL and UL subframes. Multiplexing 16e and 16m MSs in TDM mode. Define pointers inside of legacy DL-MAP/UL-MAP messages or separate FCH/MAPs for different 16m zones. –If separate 16m FCH/MAPs are used in 16m zones, 16m MAP messages can be freely defined. The same ranging codes/slots can be used by both e and m terminals or separate ranging codes/slots can be defined exclusively for m terminals. Multiple 16m zones can be embedded in one frame.

Example #1: one m UL/DL zone embedded in one frame If the new features selected by 16m system result in problems to the current 16e frame structure, it is proposed to extend the current frame to have one or more 16m zones in both DL and UL sub-frames. New 16m zone can be indicated by e.g. DL/UL Zone Switch IE in the MAP messages.

Example #2: multiple m UL/DL zone embedded in one frame In order to improve the latency performance, shorter “16m frame” can be introduced as well by introducing more than one 16m zones in one frame (i.e. 5 ms time period). FCH/MAPs in front of 2nd 16m Zone is optional. If implemented, it provides opportunity to apply measurement feedback earlier rather than waiting for whole frame duration. However, it may introduce some overhead. HARQ feedback latency can be reduced by sending the ACK/NAK in the same frame. 16m MS will have one DL (UL) zone period to perform decoding operation. 16m MS is either configured to read only one MAP or can read both MAPs. 16e MS can be supported by having separate 16e Zone in the Frame.

Example #3: multiple m UL/DL zones embedded in one frame Another alternative to introduce multiple “shorter 16m frames”. This alternative provides additional time for HARQ burst decoding because of having another “shorter 16m frame” in between. –However, it introduces more gaps comparing to the case in Figure 1 and Figure 2 resulting in degraded efficiency.

A separate zone is configured for communication between BS and RS. Transmissions from RS and BS to attached MSs are time aligned. Example #4: frame structure support relay

Methods to disable legacy support “MAC version encoding” is defined in the current 16e spec. how to disable legacy support is still open and few options are proposed below: After receiving the RNG-REQ message with “MAC version” TLV indicates that the MS is a 16e terminal, 16m BS can response in RNG-RSP “status = abort” to ask MS to go for different frequencies. Replace the 16eDL-MAP with 16mDL-MAP – 16m BS continues to use 16e preamble and FCH. However, 16m BS shall transmit 16mDL-MAP. 16e MS will look for 16e DL-MAP which they will never receive and therefore switch the channel after “Lost DL-MAP” Timer expiry. If the need of new preamble is justified, the new preamble can be used to disable legacy support.

Summary It is suggested to discuss and include the proposed TDD frame structure into SDD documents. Proposed text is included in the contribution (IEEE C80216m- 07/215r1).