1. doc.: IEEE /XXXr0
Sep 19, 2007
Project: IEEE P 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, , Japan]
Voice: [], FAX: [ ],
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 P 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 P
Shu Kato
Name - WirelessHD

2. High Level Summary
The Common Mode Signaling (CMS): specified to enhance intersystem coexistence in the IEEE c (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

3. Two Important Items for Coexistence
Channelization
i. The same channelization: must for better coexistence of multiple systems in the same frequency band
ii c 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

4. 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
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

5. (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)

6. 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

7. 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

8. 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

9. 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

10. 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 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

11. 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

12. 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 = xlog(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

13. 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

14. 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