doc.: ieee 802.15-05-274-00 submission may 2005 welborn (freescale) et al. slide 1 project: ieee...

May 2005

Welborn (Freescale) et al.Slide 1

doc.: IEEE 802.15-05-274-00

Submission

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

Submission Title: [DS-UWB Proposal Update]Date Submitted: [May 2005]Source: [Matt Welborn] Company [Freescale Semiconductor, Inc]Address [8133 Leesburg Pike, Vienna VA 22182]Voice:[703-269-3000], FAX: [], E-Mail: [matt.welborn @ freescale.com]

Re: [Response to Call for Proposals]

Abstract: []

Purpose: [Provide technical information to the TG3a voters regarding DS-UWB (Merger #2) Proposal]

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.

May 2005


doc.: IEEE 802.15-05-274-00

Submission

Overview

• The DS-UWB proposal– Proposal overview– True UWB = Scalability

• Higher data rates• Higher power• Lower rates & longer ranges

• Your support for the TG3a standard

May 2005


doc.: IEEE 802.15-05-274-00

Submission

Key Features of DS-UWB• Based on true Ultra-wideband principles

– Large fractional bandwidth signals in two different bands– Benefits from low fading due to wide bandwidth (>1.5 GHz)

• Best relative performance at high data rates

• An excellent combination of high performance and low complexity for WPAN applications– Support scalability to ultra-low power operation for short range

very high rates using low-complexity implementations – Performance exceeds the Selection Criteria in all aspect– Better performance and lower power than any other proposal

considered by TG3a

• Excellent basis for operation under “gated UWB” rules

May 2005


doc.: IEEE 802.15-05-274-00

Submission

DS-UWB Operating Bands

• Each piconet operates in one of two bands– Low band (below U-NII, 3.1 to 4.9 GHz) – Required to implement– High band (optional, above U-NII, 6.2 to 9.7 GHz) – Optional

• Different “personalities”: propagation & bandwidth• Both have ~ 50% fractional bandwidth• Each band supports up to 6 different piconets

3 4 5 6 7 8 9 10 11

Low Band

3 4 5 6 7 8 9 10 11

High Band

GHz GHz

May 2005


doc.: IEEE 802.15-05-274-00

Submission

Data Rates Supported by DS-UWB

55 MHz24½28 Mbps

110 MHz12½55 Mbps

220 MHz6½110 Mbps

440 MHz3½220 Mbps

660 MHz2½330 Mbps

660 MHz2¾500 Mbps

660 MHz21 660 Mbps

1320 MHz1¾1000 Mbps

Symbol RateCode LengthFEC RateData Rate

(Similar Modes defined for high band – up to 2 Gbps)

May 2005


doc.: IEEE 802.15-05-274-00

Submission

Range for 110 and 220 Mbps

Channel Model

90% outage range

110Mbps

90% outage range

220Mbps

AWGN 23.4m 16.5m

CM1 14.0m 9.7m

CM2 11.9m 8.1m

CM3 12.4m 7.9m

CM4 11.8m 7.4m

May 2005


doc.: IEEE 802.15-05-274-00

Submission

Range for 500 and 660 Mbps

Channel Model

500Mbps 90% outage

range

660Mbps 90% outage

range*

AWGN 8.5m 9.1m

CM1 4.3m 4.2m

CM2 3.7m 3.2m

•This result if for code length = 1, rate ½ k=6 FEC•Additional simulation details and results in 15-04-483-r5

May 2005


doc.: IEEE 802.15-05-274-00

Submission

DS-UWB: The Best Solution• We have presented a proposal superior to any others

considered by TG3a– Lower complexity– Higher performance– Satisfies all 15.3a applications requirements to 1+ Gbps– Scalable to other application spaces and regulatory

requirements• Multi-Gbps for uncompressed video/transfer applications• Low rate/low complexity applications – many DS-type approaches

are under consideration by TG4a– Compliant with all established regulations & proposed

regulations• Lowest interference effects for other systems• OOB emissions well below any proposed limits• Capability to support other regulatory restrictions

May 2005


doc.: IEEE 802.15-05-274-00

Submission

Scalability

• Higher data rates

• Longer ranges & higher capacity

• Low power consumption

May 2005


doc.: IEEE 802.15-05-274-00

Submission

Performance at High Rates (1 Gbps)• DS-UWB has multiple modes (with FEC) supporting 1+ Gbps (2 bands)• Simulations in different AWGN and multipath channel conditions• This is the only proposal considered by TG3a that has demonstrated

the capability to satisfy this 1 Gbps requirement from the SG3a CFAs & TG3a Requirements Document

– No MIMO or higher order modulation (e.g. 16-QAM) is required

Environment Range Criteria

AWGN 5.3 m Mean

Low band CM1 1.7 m 85% Outage

Low band CM1 2.7 m 90% Mean

Low band CM 6*

(3 ns RMS delay spread)

2.2 m

3.3 m

90% Outage 90% Mean

High band CM1 2 m 90% Outage

High band CM2 1 m 90% Outage*CM 6 is a modification of CM1 with 3 ns RMS delay spread – details in doc 05/051r1

May 2005


doc.: IEEE 802.15-05-274-00

Submission

The Advantages of Higher Data Rates

• The new provisions for gated UWB systems create an even greater advantage for high rate systems– Before, only applications that needed highest rates at short range

were affected by effectiveness of high rate modes• High speed file transfer, uncompressed video, etc.

– Now, every application can be improved through the use of efficient high rate modes

• Those requiring longer ranges operate at lower duty cycle and send the same data in less time

• As UWB technology matures, systems will be designed to transfer data at highest supported data rates– Maximizes network capacity for supporting more applications– No transmit power penalty – range trade-off is completely changed

• Technologies that do not scale will be left behind or will be limited in their ability to provide the performance

May 2005


doc.: IEEE 802.15-05-274-00

Submission

Gated UWB will Change UWB Trade-Offs

• Represents a change in fundamental UWB system design trade-offs• Significant incentive for designers to use lower duty cycle to

increase transmit power– Increases network capacity “for free”– Requires scaling to higher data rates to enable low duty cycle

• All waveforms do not benefit equally from the gated UWB provisions– Requires scaling to higher data rates without loss of efficiency or

performance– Any waveform that already has high peak requirements could preclude

efficient operation as a gated UWB system• DS-UWB is ideally suited to support gated UWB operation and

benefit from the many system-level advantages it can provide

May 2005


doc.: IEEE 802.15-05-274-00

Submission

Key System Level Issue: Scalability

• Scalability to higher data rates and higher transmit power is essential to realize the benefits of low duty cycle operation

• This is the “Sweet Spot” for gated UWB performance– Allows increased network capacity– Like “creating” free additional spectrum

• Support more applications with little impact to network

– Without sacrificing power efficiency• Higher Eb/No requirements preclude benefits of gating

– Ultimate scalability depends on instantaneous signal bandwidth

May 2005


doc.: IEEE 802.15-05-274-00

Submission

Gating Analysis

• Decrease duty cycle and increase power– Simple model assumptions:

• N devices using equal data rates at equal range, RApp

• Network capacity = Number of devices x Application rate = DNet= N x DApp

• Devices have maximum data rate DMax

• Path loss scales as 1/Rn, assume n=2 to 3

• Questions– How can we increase network capacity & range?– How can we reduce device power consumption?

May 2005


doc.: IEEE 802.15-05-274-00

Submission

Shared Duty Cycle Operation for UWB Applications

1 ms Integration Time

+6 dB

-41.25 dBm/MHz RMS over 1ms Power limit+10 dB

TVApplication

1

TVApp1

TVApplication

1

• New regulations for gating provide system flexibility– Multiple ways to send same data over same range– Each has same total energy emitted into the air, but – Higher data rates allow more total network capacity– Also enables lower power solution for handheld applications

• Gated operation can deliver lower overall power consumption

May 2005


doc.: IEEE 802.15-05-274-00

Submission

Effects of Packet Overhead

• Packet networks have fixed overhead that impacts scaling as data rate increases– Preamble & headers– As rate increases with gating, duty cycle (DC) decrease is

limited by fixed overhead

DC100 = (TOH + TData)/TAve

DC200 = (TOH + ½TData)/TAve

TOH TData

May 2005


doc.: IEEE 802.15-05-274-00

Submission

Increasing Application Range Performance

• Requirement: support N devices at DApp

• Question: How much can gating increase the range?

• Assumptions– Operate each device at rate of DDev= N x DApp @ range RD

• Gating at < 1 ms allows Tx power increase– Data duty cycle, DC = DApp/DDev = 1/N, so power increases N times

• Range increases beyond RD:

nAppDevDMax DDRR )/( n

OHAveDevApp

AveDMax TTDD

TRR

)/(

May 2005


doc.: IEEE 802.15-05-274-00

Submission

Range Performance Increases with Gating Systems

0.00

1.00

2.00

3.00

4.00

5.00

6.00

1.0 2.0 5 10 20 50 100 200 500 1000

100 Mbps, n=2

500 Mbps, n=2

1000 Mbps, n=2

100 Mbps, n=3

500 Mbps, n=3

1000 Mbps, n=3

Range Performance with Gating using 15 dB Peak Margin

Ran

ge

Per

form

ance

In

cre

ase

Application Data Rate (Mbps)

Device Rate (Mbps)

May 2005


doc.: IEEE 802.15-05-274-00

Submission

Range Performance Increases with Gating Systems – Including 15 usec Packet Overhead

0.00

1.00

2.00

3.00

4.00

5.00

6.00

1.0 2.0 5 10 20 50 100 200 500 1000

100 Mbps, n=2

500 Mbps, n=2

1000 Mbps, n=2

100 Mbps, n=3

500 Mbps, n=3

1000 Mbps, n=3


Ran

ge

Per

form

ance

In

cre

ase


Device Rate (Mbps)

May 2005


doc.: IEEE 802.15-05-274-00

Submission

Range Performance Increases with Gating Systems

0.00

0.50

1.00

1.50

2.00

2.50

1.0 2.0 5 10 20 50 100 200 500 1000

100 Mbps, n=2

500 Mbps, n=2

1000 Mbps, n=2

100 Mbps, n=3

500 Mbps, n=3

1000 Mbps, n=3


Ran

ge

Per

form

ance

In

cre

ase


Device Rate (Mbps)

May 2005


doc.: IEEE 802.15-05-274-00

Submission

Conclusion on Range Performance

• Model of fixed bit rate (~1-100 Mbps) matches many applications – Steaming multimedia, file transfer, etc.

• Performance increases are significant with gating, as high as 3-5 times greater range– Depends on path loss exponent– Depends on peak power margin– Depends on ability to scale to higher rates– Not impacted significantly by fixed packet overhead for most

applications

May 2005


doc.: IEEE 802.15-05-274-00

Submission

How a Fast Radio Saves Power forMobile Devices

Radio “ON”Power `

Radio “Sleep”Power

Radio “OFF”

Radio turned on and off during transfer of datato/from mobile device memory to minimize energy use

Time

PSleep

POn

• The UWB radio is turned on & off to transfer packets of data– “On” time is a function of data rate– Radio sleeps during data transfer to/from handset memory

• Total energy consumed from battery is the “area” under the curve

May 2005


doc.: IEEE 802.15-05-274-00

Submission

Conclusions & Your Support

• DS-UWB technology provides the best design for TG3a to be a successful standard

• The recent ruling to allow gating has fundamentally changed the UWB landscape– DS-UWB is uniquely situated to benefit

• We invite your support for DS-UWB during the confirmation vote on Wednesday

doc.: ieee 802.15-05-274-00 submission may 2005 welborn (freescale) et al. slide 1 project: ieee...

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