Backward Compatible PHY Feasibility

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Presentation transcript:

Backward Compatible PHY Feasibility May 2018 doc.: IEEE 802.11-18/0933r0 July 2018 Backward Compatible PHY Feasibility Date: 2018-07-06 Authors: Onn Haran (Autotalks) Onn Haran (Autotalks)

Backward Compatibility PHY Enhancements July 2018 Backward Compatibility PHY Enhancements PHY enhancement is considered backward compatible if a legacy device can decode the data Packet modification isn’t possible Adding post-packet data is a potential change Shouldn’t harm legacy device operation and access to the network Onn Haran (Autotalks)

Concatenated Error Protection July 2018 Concatenated Error Protection Outer error correction code can be appended to packet, protecting it without changing it Outer code (enc.) Inner code (conv.) 802.11p data 802.11p data Parity 802.11p packet Coded parity Channel Outer code (dec.) Inner code (Viterbi) 802.11p data 802.11p data Parity 802.11p packet Coded parity Onn Haran (Autotalks)

Adding Parity Bytes Without Harming Backward Compatibility July 2018 Adding Parity Bytes Without Harming Backward Compatibility Parity bytes can be appended to packet till SIFS Using 802.11 5GHz SIFS (16us) and not the unnecessary long 802.11p SIFS (32us) Parity bytes are ignored by DIFS state machine Caveat: very close vehicles might exceed -62dBm energy detect threshold Legacy device receives packet while ignoring parity bytes NGV device benefits from coding gain 802.11p packet Parity 16uS SIFS 58uS 11p DIFS Onn Haran (Autotalks)

Outer Error Correction Code May 2018 doc.: IEEE 802.11-18/0933r0 July 2018 Outer Error Correction Code Reed-Solomon (RS) is commonly used as outer code Can correct (N-K)/2 bytes by adding (N-K) parity bytes to N bytes block Low complexity decoding Packet is divided to blocks where each block is encoded / decoded independently. Last block may be shorter Validation of parity bytes existence isn’t needed Decoding isn’t performed on packets with good CRC When CRC is bad, and parity bytes are missing, RS decoding may introduce more errors, but packet isn’t good anyhow, so no harm is done 802.11p packet Parity P1 P2 P3 Block 1 Block 2 Block 3 Onn Haran (Autotalks) Onn Haran (Autotalks)

Outer Code Construction July 2018 Outer Code Construction Entire parity bytes should fit 5 symbols (58-16=42us) Avoiding tailing bits is recommended Increases number of available parity bytes, but complicates coding Code can be selected per packet according to packet length Code Max. decoded length MCS Tail bits RS(86, 80) 400 1 No RS(166, 160) 800 RS(250, 244) 1220 RS(248, 244) 1708 Opt. 2440 3 Onn Haran (Autotalks)

Outer Code Gain MCS=1, 239 bytes packet, 1RX July 2018 Outer Code Gain MCS=1, 239 bytes packet, 1RX ~3dB gain [C2C_highway_NLOS_enhanced (Doppler=2352Hz)] ~0.5dB gain [AWGN] ~1.5dB [C2C_highway_LOS_enhanced (Doppler = 1176Hz)] Onn Haran (Autotalks)

July 2018 Summary Enhanced PHY messages are received by 802.11p devices and increase NGV devices communication range Not impacting legacy IEEE802.11p reception, network access and fairness Forward looking solution, supporting high network load Utilizing long DIFS period for outer error correction code bytes High gain (~3dB) is achieved on complex channels, where range increase is desired Simple channels have low gain (~1dB) but communication range already surpasses requirements by far Onn Haran (Autotalks)