[A-MAP relevance and HARQ timing for long TTI transmission (Section 15.3.9.2.2)] IEEE 802.16 Presentation Submission Template (Rev. 9) Document Number:

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[A-MAP relevance and HARQ timing for long TTI transmission (Section )] IEEE Presentation Submission Template (Rev. 9) Document Number: IEEE C802.16m-09/1923r1 Date Submitted: Source: Mihyun Lee, Hyunkyu Yu, Jaeweon Cho, Hokyu Choi Samsung Electronics Co., Ltd. Venue: 80216m-09_0044, “Letter Ballot #30” Base Contribution: This is a contribution Purpose: Discuss and adopt the proposed text 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 I EEE 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 contri bution 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.

A-MAP Relevance and HARQ Timing for Long TTI Transmission (Section ) Mihyun Lee, Hyunkyu Yu, Jaeweon Cho, Hokyu Choi Samsung Electronics 2

Long TTI Transmission A data burst occupies contiguous multiple subframe - 4 in FDD DL/UL - D in TDD DL, U in TDD UL Purpose of long TTI transmission - UL Coverage Enhancement - Signaling Overhead Reduction 3

Current A-MAP Relevance The transmission of the A-MAPs for long TTI burst are concentrated in a certain subframe as 0 th subframe (SF0) A-MAP region in 0 th subframe become larger and larger according to number of long TTI bursts  large DRU regions are needed for A- MAP  limit to CRU region 4

Current HARQ Feedback Timing HARQ feeback corresponding long TTI burst shall be transmitted in 0 th UL subframe 5

Proposed A-MAP Relevance Long TTI transmission begins in 0 th subframe of next frame when DL subframes (except 0 th ) contains the A-MAPs indicating long TTI 6

Proposed HARQ Feedback Timing HARQ feeback corresponding long TTI burst is transmitted in the UL subframe corresponding DL subframe index contains the burst’s A- MAP 7

Examples of Proposed Timing DL long TTI (e.g. Tproc = 3 subframes) UL long TTI (e.g. Tproc = 3 subframes) 8

Proposed Remedy #1 (TDD DL HARQ) Add the following text in line 29, page 176, section Note that when a DL Basic Assignment A-MAP IE in the l-th subframe of the i-th frame indicates the long TTI transmission and l is 0, the subframe index m and frame index j shall be calculated as shown in Table 725. When a DL Basic Assignment A-MAP IE in the l-th subframe of the i-th frame may also indicate the long TTI transmission and l is not 0, the long TTI transmission of the DL HARQ subpacket shall begin in the 0-th DL subframe of the (i+1)-th frame. A HARQ feedback for this long TTI transmission shall be transmitted in the n-th subframe of the j-th frame. The subframe index n and the frame index j shall be calculated according to equations in Table 725, with replacing the subframe index m and frame index i by l and i+1, respectively. 9

Proposed Remedy #2 (TDD UL HARQ) Add the following text in line 60, page 177, section When an UL Basic Assignment A-MAP IE in the l-th subframe of the i-th frame indicates the long TTI transmission, the UL HARQ subpacket transmission shall begin in the 0-th UL subframe of the j-th frame. A HARQ feedback for this long TTI transmission shall be transmitted in the l-th DL subframe of the k-th frame. When the UL HARQ feedback indicates a negative acknowledgement, retransmission of the UL HARQ subpacket shall begin in the 0-th UL subframe of the p-th frame. The frame index j, k, p shall be calculated according to equations in Table 726, with replacing the subframe index m by 0. 10