NGV PPDU Hierarchical MCS Proposal
This contribution explores a new NGV PPDU compatible with WAVE PPDU, facilitating efficient communication with WAVE and NGV devices simultaneously using hierarchical MCS technology. It discusses the advantages and challenges of multiplexing methods in TGbd specification for spectral efficiency and reliability trade-off.
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May 2019 doc.: IEEE 802.11-19/0864r0 NGV PPDU with Hierarchical MCS Date: 2019-05-13 Authors: Name Enrico Rantala Affiliations Address Phone email enrico-henrik.rantala@nokia.com Olli Alanen Mika Kasslin Janne Marin Nokia Veli-Matti Kolmonen David Lopez- Perez Lorenzo Galati Adrian Garcia Submission Slide 1 Enrico Rantala, Nokia
May 2019 doc.: IEEE 802.11-19/0864r0 Abstract This contribution proposes a new NGV PPDU, compatible with WAVE PPDU, enabling spectral efficient way to communicate with WAVE and NGV capable devices simultaneously using hierarchical MCS. Other kind of NGV PPDU, where WAVE and NGV payloads are concatenated in time, is discussed in [1] Submission Slide 2 Enrico Rantala, Nokia
May 2019 doc.: IEEE 802.11-19/0864r0 Multiplexing with Hierarchical MCS Hierarchical MCS is a technology used for example in various DVB standards [2] The basic idea is to have two independent streams, called basic and additional layer, transmitted at the same time, each coded with different modulations In DVB, it can mean that the transmission includes SD level video encoded with 16QAM modulation and HD video using 256QAM. Submission Slide 3 Enrico Rantala, Nokia
May 2019 doc.: IEEE 802.11-19/0864r0 WAVE and NGV layers NGV stream bits WAVE stream bits BSM-1 MCS-x BSM-2 MCS-y BSM-1 BSM-2 BSM-1 802.11bd MAC 802.11p MAC 802.11bd MAC 802.11bd PHY 802.11p PHY 802.11bd PHY Hierarchical multiplexing BSM-1 on WAVE layer BSM-2 on NGV layer Both layers received Only WAVE Layer received BSM: Basic Safety Message WAVE receiver can decode only the basic (WAVE-) layer, NGV receiver can decode the both layers, basic (WAVE-) layer and additional (NGV-) layer, depending on the SINR We preferably need a mechanism to indicate NGV layer existence to NGV devices e.g. by reusing some WAVE header bit MCS used in NGV layer can be derived from WAVE MCS (e.g. if WAVE layer is modulated with QPSK then NGV is with 64QAM) if there is no reusable bits to spare for this purpose Submission Slide 4 Enrico Rantala, Nokia
May 2019 doc.: IEEE 802.11-19/0864r0 Proposal We propose a new type of NGV PPDU that is compatible with WAVE PPDU Comparing NGV PPDU that multiplexes WAVE+NGV payloads concatenated in time versus with use of hierarchical MCS, the main advantage is simultaneous transmission of the payloads and the main disadvantage is inter-layer interference requiring better SINR We believe that both multiplexing methods (concatenated in time and hierarchical MCS) would be beneficial to be specified in TGbd allowing upper layers to do the trade-off between spectral efficiency and reliability Slide 5 Submission Enrico Rantala, Nokia
March 2019 doc.: IEEE 802.11-19/0864r0 References [1] https://mentor.ieee.org/802.11/dcn/19/11-19-0082-02- 00bd-interoperable-approach-for-ngv-new- modulations.pptx [2] https://www.etsi.org/deliver/etsi_tr/102300_102399/102 377/01.04.01_60/tr_102377v010401p.pdf Submission Slide 6 Enrico Rantala, Nokia
