July 2003

Ed Callaway, MotorolaSlide 1

doc.: IEEE 802.15-04/189r0

Submission

Project: IEEE P802.15 Working Group for Wireless Personal Area Networks (WPANs)Project: IEEE P802.15 Working Group for Wireless Personal Area Networks (WPANs)

Submission Title: [PHY Proposal]Date Submitted: [July 2003]Source: [Ed Callaway] Company: [Motorola]Address: [8000 W. Sunrise Blvd, Plantation, Florida, 33322, USA]Voice:[+1 954 723 8341], FAX: [+ 1 954 723 3712], E-Mail:[ed.callaway@motorola.com]

Re: [ IEEE 802.15.4 ]

Abstract: [This contribution proposes an alternate PHY for TG4.]

Purpose: [To encourage discussion.]

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.

July 2003

Ed Callaway, MotorolaSlide 2

doc.: IEEE 802.15-04/189r0

Submission

Forces on TG4 since the 11/00 PAR-1

• European expansion of 868 MHz band in process• The “Banding Branding” Problem: Potential

market confusion between the two existing PHYs difficult to overcome; may affect investment in the industry

• 1% duty cycle of present 868 MHz band limits throughput and sleep time with present low data rate PHY

July 2003

Ed Callaway, MotorolaSlide 3

doc.: IEEE 802.15-04/189r0

Submission

Forces on TG4 since the 11/00 PAR-2• Additional WPAN applications (consumer remote

control displaying channel, audio or low resolution video capture; security systems displaying low quality still image capture, 16 kbps encoded audio for voice recognition remotes, PC peripherals, toys, games, and automation and control systems) have been identified by ZigBee, that cannot be served by the existing 20/40 kb/s data rate.

• Chip vendors have informally proposed nonstandard “dual band” chips, using 2.4 GHz modulation scheme at 915 MHz, to get higher data rates there.

July 2003

Ed Callaway, MotorolaSlide 4

doc.: IEEE 802.15-04/189r0

Submission

Proposal

• Create a new PHY for 802.15.4 that employs the 2.4 GHz modulation scheme on the 865-868.6 MHz and 902-928 MHz bands, but at half the chip rate:– A single 125 kb/s channel centered at 866.8 MHz

(Channel k = 27).– Ten 125 kb/s channels at 906 + 2 * (k – 28) MHz

(k = 28 – 37, overlaying the existing channels).

July 2003

Ed Callaway, MotorolaSlide 5

doc.: IEEE 802.15-04/189r0

Submission

-3 -2 -1 0 1 2 3-55

-50

-45

-40

-35

-30

-25

-20

-15

-10

-5

0

f-fc (MHz)

PS

D (

dBm

/100

kHz)

fo

r 0

dBm

Tx

pow

er

250 nW

2.5 MHz

Spectral Plot of 0 dBm 125 kb/s Signal

July 2003

Ed Callaway, MotorolaSlide 6

doc.: IEEE 802.15-04/189r0

Submission

-3 -2 -1 0 1 2 3 4 5-55

-50

-45

-40

-35

-30

-25

-20

-15

-10

-5

0

f-fc (MHz)

PS

D (

dBm

/100

kHz)

fo

r 0

dBm

Tx

pow

er

2 MHz

Adjacent Channel Spectra

July 2003

Ed Callaway, MotorolaSlide 7

doc.: IEEE 802.15-04/189r0

Submission

Features of Our Proposal-1• A multiband TG4 transceiver becomes

much easier to build. Such a device could eliminate interoperability problems and resulting market confusion.

• Users of the 902-928 MHz band get a 3x increase in data rate, without a reduction in the number of available channels.

July 2003

Ed Callaway, MotorolaSlide 8

doc.: IEEE 802.15-04/189r0

Submission

Features of Our Proposal-2

• Advantage is taken of the expanded 868 MHz band, giving European users a 6x increase in data rate.

• Economy of scale, greater purchasing leverage via reduced sourcing costs, and faster design cycle benefits are gained by the OEM.