Hybrid ARQ for synchronous allocation in distributed subcarrier mode Document Number: S80216m-08_290r1 Date Submitted: 2008-05-05 Source: Alexei Davydov.

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Hybrid ARQ for synchronous allocation in distributed subcarrier mode Document Number: S80216m-08_290r1 Date Submitted: Source: Alexei Davydov Voice: Alexander Maltsev Intel Russia, Nizhny Novgorod, Ul. Turgeneva, 30 Venue: Session #55 Macao, PRC Base Contribution: IEEE C80216m-08_290r1 Purpose: For discussion and adoption by IEEE m group 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.

Synchronous Allocation of HARQ retransmissions Different approaches for signaling overhead reduction may results to synchronous allocation of HARQ retransmissions Persistent scheduling: –Constant characteristics of the traffic parameters during transmission session packet size transmission mode packet arriving interval –Persistent resources may also be reserved for estimated HARQ retransmissions => HARQ retransmissions in persistent allocation is essentially synchronous Synchronous HARQ: –The retransmissions occurs at a pre-determined time-frequency instances –Low control signalling overhead

Conventional Synchronous Allocation of HARQ Retransmissions Illustration of convention synchronous allocation of HARQ retransmissions: Retransmission happens at the predetermined time instances Data burst allocation remains the same within sub frame

Problem Statement and Solution For conventional synchronous allocation the HARQ retransmissions allocation does not change from frame to frame and occurs at the same time-frequency instance as an initial transmission For applications that require short latencies (comparing to channel coherence time) the channel is almost static across the retransmissions. The expected post-processing SNR (Signal-to-Noise Ratio) improvement due to retransmission is about 3dB for Chase Combining and provided by time diversity and coherent combining only For distributed subcarrier mode the additional frequency and spatial diversity (additionally to time diversity) may be provided for the each next retransmission thus giving additional efficiency and robustness for the synchronous allocation of HARQ retransmissions The new parameters that define the sub channel and spatial stream rotation offsets may be signaled via L1/L2 control channel(s)

Proposed Synchronous Allocation of HARQ Retransmissions Illustration of proposed synchronous allocation of HARQ retransmissions: Retransmission happens at the predetermined time instance Data burst allocation is rotated with predetermined offset within sub frame

Spatial Stream Rotation for Vertical MIMO HARQ Illustration of data spatial stream rotation for vertical spatial multiplexing for proposed synchronous allocation of HARQ retransmission: Retransmission happens at the predetermined time instances Spatial streams are rotated with predetermined offset Spatial stream Time of Transmission

Performance Comparison Initial Transmission MS speed 3 kmph, retransmission delay 10 ms, Chase Combining 1st retransmission for conventional synchronous allocation of HARQ retransmissions 1st retransmission for proposed synchronous allocation of HARQ retransmissions

Performance Comparison (Cont’d) Initial Transmission 1st retransmission for conventional synchronous allocation of HARQ retransmissions 1st retransmission for proposed synchronous allocation of HARQ retransmissions MS speed 3 kmph, retransmission delay 10 ms, Chase Combining

Proposed Text for SDD