doc.: IEEE 802.15-<doc#> <month year> doc.: IEEE 802.15-<doc#> Project: IEEE P802.15 Working Group for Wireless Personal Area Networks (WPANs) Submission Title: [PHY pre-proposal for PAC common discovery mode] Date Submitted: [May 2013] Source: [Tae-Joon Park*, Jae-Min Ahn**, Keun Hyung Lee*, Wun-Cheol Jeong*, Chang-Sub Shin*, Hoyong Kang*] Company: [*ETRI, **Chungnam National Univ.] E-Mail:[*tjpark@etri.re.kr, **jmahn@cnu.ac.kr] Re: [] Abstract: Notice: This document has been prepared to assist the IEEE P802.15. It is offered as a basis for discussion and is not binding on the contributing individual(s) or organization(s). The material in this document is subject to change in form and content after further study. The contributor(s) reserve(s) the right to add, amend or withdraw material contained herein. Release: The contributor acknowledges and accepts that this contribution becomes the property of IEEE and may be made publicly available by P802.15. <author>, <company>

PHY Pre-proposal for PAC common discovery mode <month year> doc.: IEEE 802.15-<doc#> PHY Pre-proposal for PAC common discovery mode Tae-Joon Park*, Jae-Min Ahn**, Keun Hyung Lee*, Wun-Cheol Jeong*, Chang-Sub Shin*, Hoyong Kang* *ETRI, **Chungnam National Univ <author>, <company>

Common discovery mode for PAC PD finding Exchange PD capability Peer-to-peer connection setup To support interoperability between PAC devices regardless of frequency bands Discovery mode should be unique in PAC Optimized for peer-discovery

Requirements of Common discovery mode Low HW implementation complexity RF chain ADC/DAC Baseband Simple and robust PHY IPR free to reduce the debate for mandatory mode  requires well known and simple PHY Robustness is more important than the transmission rate Single mode (modulation type, rate, etc.)

Messages over Common discovery mode Beacon Broadcast PD capabilities Connection request IDs With the capabilities of requesting PD Connection acknowledge With the connection mode

Possible framing structure Preamble Header Message type Length of PSDU Header check sequence PSDU Preamble Header PSDU

Possible modulation type Binary FSK On-off Keying Differential BPSK Simple receiver structure with non-coherent demodulation Moderate performance

Pros and cons for modulation types Binary FSK - Constant envelope - Simple receiver - Low bandwidth efficiency On-Off Keying Simplest receiver More bandwidth efficiency - Higher PAPR Differential BPSK Simple receiver - Digital Baseband implementation only

Encoding Error detection and retransmission only Reducing the decoder complexity Simple CRC would be OK Ex: 8bit CRC

Preamble Purpose of preamble Signal detection AGC synchronization AFC : frequency synchronization Symbol synchronization Frame synchronization Etc. Preamble sequence candidates CAZAC sequence M-sequence Barker code Gold code

Example of transmitter structure Add CRC Scramble MUX PSDU information To transceiver Modulation And/or Spreading Add CRC Scramble Header information Preamble

PHY parameters Band candidates Sub-1GHz ISM : 2.4GHz, 5GHz 6-10GHz Other licensed band Data rate and Bandwidth 50Kbps, 200KHz is enough for implementing common communication mode