doc.: IEEE 802.11-00/XXXr0 Sep 19, 2007 Project: IEEE P802.15 Working Group for Wireless Personal Area Networks (WPANs)‏ Submission Title: [Common Mode Signaling (CMS) for Intersystem Coexistence Enhancement] Date Submitted: [8 March 2009] Source: [S. Kato, C.S. Sum, T. Baykas, Z. Lan, J. Wang, R. Funada, M.A. Rahman, C.W. Pyo, H. Harada, I. Lakkisa,] Company [NICT, Tensorcoma] Address [3-4, Hikarino-oka, Yokosuka, 239-0847, Japan] Voice: [], FAX: [+81-46-847-5440], E-Mail: [shu.kato@nict.go.jp] Re: [] Abstract: [Intersystem coexistence enhancement by using common mode signaling ] Purpose: [This document provides a solution for intersystem coexistence] 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. Shu Kato Name - WirelessHD

High Level Summary The Common Mode Signaling (CMS): specified to enhance intersystem coexistence in the IEEE 802.15.3c (TG3c) system design by transmitting and receiving a specific frame (synch frame) with much higher detection capability than “energy detection” in very low C/N environments The outline of this document: Two important items for coexistence Overview on TG3c system design The importance of intersystem coexistence What is CMS How does CMS enhance intersystem coexistence CMS frame format Design specifications of CMS CMS performances TG3c-Tgad coexistence using CMS Shu Kato

Two Important Items for Coexistence Channelization i. The same channelization: must for better coexistence of multiple systems in the same frequency band ii. 802.15.3c adopts a channelization of “4 channels over 9 GHz” and this has been accepted by WirelessHD and adopted by ECMA as well – better to use the same channelization as specified by TG3c “In-use channel “ detection capability i. Proposing “in-use channel detection by a specific frame transmission and detection” – Common Mode Signaling (CMS) transmission and reception ii. “In-use channel detection” by CMS transmission and reception: much better sensitivity than “energy detection” Shu Kato

TG3c Channel Plan Channel Number Low Freq. (GHz) Center Freq. High Freq. Nyquist BW (MHz) Roll-Off Factor A1 57.240 58.320 59.400 1728 0.25 A2 60.480 61.560 A3 62.640 63.720 A4 64.800 65.880 2160 MHz 1728 MHz 240 MHz 120 MHz 1 2 3 4 57 58 59 60 61 62 63 64 65 66 fGHz Support Cell phone XTAL: 19.2 MHz & 26 MHz & Other High frequency XTALs: 54MHz, 60MHz, 108MHz, … Balanced margins to 57/66 GHz & Good roll-off factor Supports Multiple PLL Architectures with the Cell phone XTAL Dual PLL: High frequency PLL that generates carrier frequencies Low frequency PLL that generates ADC/DAC & ASIC frequencies 4 4 4

(Simple Single Carrier bridging different air interfaces) Common Mode Signaling (Simple Single Carrier bridging different air interfaces) All PNC capable devices regardless PHY, shall support CMS, Synch frame transmission and reception capability CMS: to enhance coexistence of different air interfaces which will be best suite to separate market segments CMS: simple single carrier (p/2 BPSK with Reed Solomon as FEC) for robust and longer transmission range Common Mode Signaling Single Carrier PNC (DEVs) OFDM (PNC) CMS: Single Carrier Beacon (p/2 BPSK with RS as FEC)

Overview on TG3c System Design One unified MAC Three PHYs optimized for respective and specific market segments Single carrier (SC) PHY low complexity, low power consumption and low cost handheld mobile applications High speed interface (HSI) PHY - OFDM low latency bi-directional data communications PC peripherals AV PHY - OFDM optimized for high speed uncompressed video transmission Audio/visual consumer electronics (CE) applications Shu Kato

The Importance of Intersystem Coexistence Multiple PHY modes are specified in the TG3c system to address respective application and market segments If these PHY modes do not recognize each other, they may interfere mutually and the overall performance will be degraded All PHY modes compliant to the TG3c system design shall not interfere with each other CMS is a signaling scheme specified to facilitate enhanced intersystem coexistence within the TG3c system Shu Kato

What is CMS CMS is a low data rate single carrier (SC) signal specified for intersystem coexistence purposes The CMS is used for SC PHY transmission of Beacon frame and sync frame Command frame and training sequence in beam forming Several rules are specified for the usage of CMS to enhance intersystem coexistence Shu Kato

How does CMS enhance Intersystem Coexistence The below rules on CMS usage are specified in the TG3c draft: An AV or an HSI PNC shall send a CMS sync frame in every superframe An AV or an HSI PNC shall be able to receive the CMS sync frame An SC PNC shall send CMS beacon in every superframe All SC DEV shall be able to send and receive signal in CMS The specified rules indicate that all PHY modes are able to communicate with / detect each other using a commonly supported signaling scheme Any new PNC seeking to start a piconet, shall initially perform channel scan. Upon receiving CMS beacon/sync frame from an already-active PNC, this new PNC will be aware of its existence and shall avoid interfering signal transmission Shu Kato

CMS frame format PHY preamble Frame header Payload MAC header 10 octets HCS 2 octets RS parity bits 16 octets PHY header 5 octets SFD 4 repetition of Golay code length 512 CES 6 repetition of Golay code length 512 + Golay code length 128 SYNC 128 repetition of Golay code length 128 SYNC – Synchronization SFD – Start frame delimiter CES – Channel estimation sequence HCS – Header check sequence RS – Reed-Solomon Shu Kato

Design specifications of CMS Preamble Total duration ~12.6us: SYNC ~9.5us, SFD ~1.2us, CES ~1.9us Spreading: 128 Modulation: p/2-shift BPSK Header Forward error correction: Reed-Solomon (33,17) Spreading: 64 Modulation: p/2-shift BPSK Header rate: 12.3 Mbps Payload Forward error correction: Reed-Solomon (255,239) Data rate: 25.3 Mbps Shu Kato

CMS Performance The CMS is capable of achieving transmission range of 32.8m in AWGN channel and 10.3m in residential NLOS environment (CM2.3) Environment AWGN NLOS Transmitter Information Data Rate (Rb) 25.31 Coding Rate 0.94 Spreading factor 64 Center Frequency 60.000 Bandwidth (BW) 1.7280 Tx Antenna Gain (GT) dBi 3.0 Tx Average Power (PT) dBm 10.00 Receiver   Average Noise Power per Bit (N = -174 + 10xlog(Rb) ) -100.0 Rx Noise Figure Referred to the Antenna Terminal (NF) 8.0 Average Noise Power per Bit (PN = N +NF ) -92.0 Payload Eb/N0(S) 7.1 8.1 Payload CNR -11.2 -10.2 Implementation Loss(I) 1.5 Rx Antenna Gain (GR) dBi Sensitivity Path Loss at 1m (PL0) 68.00 Minimum Rx Sensitivity Level (Smin) -83.3 -82.3 Shadow Margin (M) 1.0 5.0 Rx Power Calculations Tolerable Path Loss PL = PT + GT + GR -PN-S-M-I-PL0 30.32 25.32 Range (d) m 32.81 10.30 Shu Kato

TG3c-TGad Coexistence using CMS The intersystem coexistence using CMS has the potential to be extended beyond coexistence for multiple PHY modes within TG3c system Other systems occupying the same frequency band (e.g. TGad system) may also utilize the CMS to further enhance the coexistence capability for a more harmonized communication environment Shu Kato

Conclusion The enhanced intersystem coexistence mechanism using CMS in TG3c system is described CMS realizes intersystem co-existence much better than the conventional detect and avoid (DAA) technology based on energy detection CMS is a good candidate for harmonized multiple system coexistence in the same frequency band, 60 GHz Shu Kato