1. November, 2003
Project: IEEE P Working Group for Wireless Personal Area Networks (WPANs)
Submission Title: [A Discussion on a Hybrid Backward Compatible WLAN/PAN Concept]
Date Submitted: [10 November 2003]
Source: [S. David Silk]
Company [Motorola]
Address [1301 E. Algonquin Road, Schaumburg, IL 60196, USA]
Voice:[(847) ], FAX: [(847) ],
Re: [mmW IG Call For Papers and Participation, IEEE P /397r2]
Abstract: [A discussion on a hybrid backward compatible WLAN/PAN concept utilizing 60 GHz]
Purpose: [mmW IG November 2003 meeting contribution]
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
S. David Silk, Motorola

2. A Discussion on a Hybrid Backward Compatible WLAN/PAN Concept
November, 2003
A Discussion on a Hybrid Backward Compatible WLAN/PAN Concept
The following organizations contributed to this document:
Motorola Labs – USA and France France Telecom R&D
S. David Silk, Motorola

3. doc.: IEEE 802.15-<doc#>
<month year>
doc.: IEEE <doc#>
November, 2003
Motivation
Observations:
The Bluetooth, IEEE802.11b, and IEEE802.11a wireless standards demonstrate a progression in data rate capability of approximately 1 Mbps, 10 Mbps, and 100 Mbps, respectively. V-Band unlicensed spectrum provides an opportunity to continue the data rate trend to Gbps operation.
A modest degradation in spectral efficiency can be traded off for a lower system cost, given the large amount of available bandwidth
Current WLAN/PAN technologies have begun to address distribution of multimedia content in dense urban environments
60 GHz unlicensed spectrum has already attracted the interest of other regulatory agencies
Challenges:
Identify features to provide added utility beyond existing WLAN/PAN technologies
mmW technology will impact solution cost
Exploit unlicensed bands with large amounts of available spectrum to realize higher capacity, cost-competitive solutions - “So much data, so little time”
Purpose of this presentation:
Consider using 60 GHz as an extension of existing WLAN/PAN solutions to provide nomadic terminal mobility achieving higher throughput for dense urban deployment
S. David Silk, Motorola
<author>, <company>

4. The Wireless Landscape
<month year>
doc.: IEEE <doc#>
November, 2003
The Wireless Landscape
80x
4 years
PAN/LAN Convergence
2.4GHz
5GHz
60GHz
IEEE802.11
HIPERLAN b
802.11a/g HIPERLAN/2
BroadWay: 60GHz
HSCD
GPRS
EDGE
3GPP
Bluetooth
HomeRF
IEEE
IEEE802.11n (HTSG)
UWB IEEE a
0,01
0,1 1 10
100
1000
1996
1998
2000
2002
2004
2006
2008
2010
Max data rate (Mbps)
GHz
application space
Video data rate
Voice
Text Messaging
Still Imaging
Audio Streaming
Video Streaming
Ubiquitous TV
Infotainment
High Speed Internet
Local Area WLAN Nomadic
Wide Area Cellular
PAN
S. David Silk, Motorola
<author>, <company>

5. 60 GHz Extension of WLAN/PAN Solutions– An Example Based on Broadway
<month year>
doc.: IEEE <doc#>
November, 2003
60 GHz Extension of WLAN/PAN Solutions– An Example Based on Broadway
The Broadway Vision:
Extend and complement 5GHz WLAN with 60 GHz to provide a solution in dense urban environments with hot spot coverage without sacrificing throughput
Provide backward compatibility with existing 5 GHz OFDM solutions
Provide total system throughput >400 Mbps via bandwidth expansion
An Example Architecture:
Access points (AP) utilize full-time dual band operation
Mobile terminals (MT) utilize one band at a time
Employ Rx omni antenna to avoid MT pointing
Employ AP transmission from remote locations for full coverage – OFDM can tolerate multipath
S. David Silk, Motorola
<author>, <company>

6. doc.: IEEE 802.15-<doc#>
<month year>
doc.: IEEE <doc#>
November, 2003
60 GHz Extension of WLAN/PAN Solutions– An Example Based on Broadway Continued
Ad-hoc clustered architecture limited to 1-2 hops to alleviate shadowing effects
Manage ad-hoc networking using TDD frame structure to preserve QoS
Using the HiperLAN/2 framework, a cluster is used for peer-to-peer communications in the 60 GHz band
The AP is responsible for the management of the system in both bands
Using a discovery and routing algorithm at 60 GHz the AP specifies clusters, cluster heads, and forward nodes
DLC/CL protocol stack has also been specified for AP and MT
Address applications for vendor hot spots, public internet access, home, enterprise, and campus environments
5 GHz AP
60 GHz MT
MT2
MT1
MT3
S. David Silk, Motorola
<author>, <company>

7. doc.: IEEE 802.15-<doc#>
<month year>
doc.: IEEE <doc#>
November, 2003
Path Loss and Range Analysis for an OFDM Solution Compatible with 5 GHz Technology
Goal: maintain 5 GHz system carrier spacing
Limit channel bandwidth to multiples of 20 MHz (40 to 240 MHz)
Limit number of subcarriers from 64 to 768 for the various bandwidths
Limit sub-carrier spacing from kHz to 625 kHz
Enable range of 2-4m using 240 MHz and 26 m using 20 MHz
System parameters for preliminary range analysis
OFDM parameters:
Carrier spacing: 625 kHz
Guard interval size: 800 ns
Oversampling rate: 0.75
Transmit power: 10 dBm
Antenna gain: GTx =3 dBi, GRx =3 dBi
Rx noise figure: 8 dB
Hardware impairment margin: 2 dB
Conclusion:
Approximately 400 Mbps is achievable at 5m
For a given bit rate an increase in bandwidth is preferable over an increase in constellation size to realize more range
S. David Silk, Motorola
<author>, <company>

8. doc.: IEEE 802.15-<doc#>
<month year>
doc.: IEEE <doc#>
November, 2003
Conclusions
Motorola is interested in contributing to the mmW Interest Group
This presentation suggests a migration to 60 GHz while maintaining backward compatibility with existing WLAN/PAN technologies – a topic area that warrants further consideration
60 GHz should be wideband to exploit the available unlicensed spectrum; a rationale for picking the right modulation scheme must be developed
Establish features/performance/criteria for differentiation from other technologies
S. David Silk, Motorola
<author>, <company>