doc.: ieee 802.15- submission july 2000 anand dabak, texas instrumentsslide 1 project: ieee p802.15...

doc.: IEEE 802.15-<199>

Submission

Slide 1 Anand Dabak, Texas Instruments

July 2000

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: [TI PHY Submission to TG3]Date Submitted: [07 July 2000]Source: [Anand Dabak] Company [Texas Instruments]Address [12500 TI Blvd, m/s 8723, Dallas, TX 75243, USA]Voice:[214.480.4389], FAX: [972.761.6967], E-Mail:[[email protected]]

Re: [original document.]

Abstract: [Submission to Task Group 3 for consideration as the High Rate PHY for 802.15.3]

Purpose: [Evaluation of 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.

July 2000

Anand Dabak, Texas InstrumentsSlide 2

doc.: IEEE 802.15-<199>

Submission

PHYsical Layer Submission to Task Group 3

Anand Dabak

Texas Instruments

July 2000


doc.: IEEE 802.15-<199>

Submission

High Speed WPAN• Criteria document specifies the following data rates :

– Audio: 128, 448, 896, 1280, 1450, 1536 kbps

– Video: 2.5, 7.3, 9.8, 18 Mbps

– Computer graphics: 15, 38 Mbps

• Propose a 2.4 GHz ISM band high speed WPAN consisting of three modes

– Mode 1: Bluetooth 1.0

– Mode 2: Maximum data rate up to 3.9 Mbps

– Mode 3: Maximum data rate up to 44 Mbps

July 2000


doc.: IEEE 802.15-<199>

Submission

High Speed WPAN• Typical system combinations:

– Mode 1 and Mode 2

– Mode 1 and Mode 3

– Mode 1 + Mode 2 + Mode3: Access points

* Bluetooth specification is -70 dBm

Configuration 1: Lower cost, lower power. Exactly the same protocol as Bluetooth. Audio and internet streaming applications

Mode 1 (Bluetooth)

Mode 2(2.6-3.9 Mbps)

Configuration 2: video, computer graphics applications

Mode 1 (Bluetooth)

Mode 3(22-44 Mbps)

Power consumption, (‘2001)Mode Data rate(Mbps)

Targetapplication

Receiversensitivity Rx. average Tx. average

Mode 1.0(Bluetooth)

1 -84 dBm* 33 mW 20 mW

Mode 2.0 2.6-3.9 Audio -84 to -78dBm

53 mW 40 mW

Mode 3.0 22-44 Video, computergraphics

-80 to -69dBm

83 mW 73 mW

July 2000


doc.: IEEE 802.15-<199>

Submission

Salient features• Interoperability with Bluetooth

• High throughput: Upto 126 Mbps over the whole ISM band

• Coexistence with Bluetooth and 802.11(b).

• Resistance to microwave, Bluetooth, 802.11(b) jamming

• Low cost: – (Mode 2+Mode 1) < 1.2 x of Bluetooth,

– (Mode 3+Mode 1) < 1.5 x Bluetooth

• Low sensitivity level: -78 dBm for mode 2 and -84 dBm for mode 3

• Low power consumption

• Designed for FCC compliance

• Compatibility with Bluetooth MAC

• Low risk approach

July 2000


doc.: IEEE 802.15-<199>

Submission

Mode 2 System Specifications• Mode 2:

* Bluetooth specification is -70 dBm

**: Can be achieved with a square root raised cosine filter of = 0.5

Parameters Bluetooth 1.0 Mode 2Frequency hopping 1600 Hz Same as Bluetooth

Filter spectrum Same as Bluetooth**Modulation GFSK 16, 64 QAM

Maximum data rate 1 Mbps 2.6, 3.9 MbpsTransmit power 0 dBm 0 dBm, 6 dBm

Distance 10 m. 10 m.Nominal packet error

rate10 % 10 %

Receiver sensitivity -84 dBm* -84, -78 dBmFading margin 24 dB 24 dBNoise figure +degradations

13 dB 13 dB

Total margin 24 + 13 = 37 dB 24 + 13 = 37 dBCoding ARQ ARQ + convolutional

code across packets(rate ½ , 16 state)

July 2000


doc.: IEEE 802.15-<199>

Submission

Mode 2• The master and slave first begin transmission in mode 1 and then negotiate to enter

mode 2.

• Interoperable with Bluetooth.

• Master maintains synchronization of all mode 1 (Bluetooth) devices in the piconet.

• Master and slave in mode 1. • Master transmits Sniff and Beacon for other mode 1 devices. • Negotiate to enter mode 2 of higher speed transmission.

• Master and slave transmit and receive in mode 2. • Enter back into mode 1 • Revert to mode 1 upon extended loss of connection.

July 2000


doc.: IEEE 802.15-<199>

Submission

Mode 2• A master could be talking to several devices in mode 1 while talking to other

devices in mode 2: Controlled by the link layer protocol in the Master.

• Sniff, Beacon and paging in mode 1.

• Full interoperability with Bluetooth

Master

Slave 1 Slave 2

Slave 3

Mode 1Mode 2

Mode 1

M MS3 S1

Mode 1

M S1 M S2 M S2 M S3

Mode 1 Mode 2 Mode 2 Mode 1 Mode 1 Mode 1 Mode 1 Mode 2 Mode 2 Mode 1 Mode 1

July 2000


doc.: IEEE 802.15-<199>

Submission

Throughput comparison of Mode 2 to Bluetooth

July 2000


doc.: IEEE 802.15-<199>

Submission

Mode 3 System SpecificationsParameters 1 2 3 4 5

Filter spectrum 802.11b 802.11b 802.11b 802.11b 802.11b

Modulation QPSK QPSK 16 QAM 16 QAM 16 QAM

Scrambling codelength

256 (DSSS) 256 (DSSS) 256 (DSSS) 256 (DSSS) 256 (DSSS)

Symbol rate 11 Msps 11 Msps 11 Msps 11 Msps 11 Msps

Coding Rate ½,Turbo

None Rate ½,Turbo

Rate ¾,Turbo

None

ARQ Optional Optional Optional Optional Optional

Data rate 11 Mbps 22 Mbps 22 Mbps 33 Mbps 44 Mbps

Transmit power -1 dBm 8 dBm 4 dBm 8 dBm 15 dBm

Distance 10 m. 10 m. 10 m. 10 m. 10 m.

Bit error rate 1e-8 1e-8 1e-8 1e-8 1e-8

Packet error rate 1e-4 1e-4 1e-4 1e-4 1e-4

Receiversensitivity

-85 dBm -76 dBm -80 dBm -76 dBm -69 dBm

Fading margin 24 dB 24 dB 24 dB 24 dB 24 dB

Noise figure 13 dB 13 dB 13 dB 13 dB 13 dB

Total margin 24+13=37 dB 24+13=37 dB 24+13=37 dB 24+13=37 dB 24+13=37 dB

Frequencydiversity

Frequencyband selection





July 2000


doc.: IEEE 802.15-<199>

Submission

Mode 3• Begin transmission in mode 1 and identify good 22 MHz bands. • Negotiate to enter mode 3.

• After spending a time T2 in mode 3 come back to mode 1 for time T1.

• Identify good 22 MHz bands.• Again negotiate to enter mode 3, this time possibly on a different 22

MHz band.• Regulatory issues similar to 802.11

• Time allocation T1 and T2 negotiated between the Master and Slave in the beginning depending upon data rate requirements of the Slave.

• Master maintains synchronization of all other Mode 1 devices in the piconet

• Sniff, Beacon, Paging, for other mode 1 devices.

July 2000


doc.: IEEE 802.15-<199>

Submission

Mode 3 (Example)

• Achieved data rates: – Mode 1 (Slaves 1,2 other mode 1 slaves): 70 kbps

– Mode 3 (Slave 3): 20 Mbps

• The mode 3 data rates are negotiable

Master

Slave 1 Slave 2

Slave 3

Mode 1 Mode 3

Mode 1

Mode 1 Mode 3 Mode 1 Mode 3 Mode 1 Mode 3

0 25 250 275 500 525

Time ( msec .)

17.5 msec

7.5 msec

Communicate with other Blueooth devices (paging, sniff, beacon etc.)

Select good 22 MHz band using Probe, listen and select (PLS)

T1 T2

July 2000


doc.: IEEE 802.15-<199>

Submission

19.8 Mbps Video transmission (Example)MPEG2 HDTV Video transmission using Mode 3Video data rate 19.8 Mbps

Video frames/sec 24Video frames/Mode 3 slot 6

Mode 3 data rate 22 MbpsCoding Rate ½, Turbo

Modulation 16 QAMTime in Bluetooth mode (T1 msec) 22.5 msec

Time in Bluetooth mode for other devices 15 msecTime in Bluetooth mode for PLS 7.5 msec

Mode 3 packet size 4.4 KbitsData bits/packet 4368CRC bits/packet 32

Mode 3 packet length 200 secNumber of packets/slot 1134

Length of training sequence 81 symbols, 7.36 secNumber of packets/training sequence 10

Number of training sequences/(6 video frames) 114Time required to transmit video frames

(slot time in mode 3, T2 msec)225.2+1.5+0.76 = 227.5 msec

July 2000


doc.: IEEE 802.15-<199>

Submission

Exponential 802.15.3 channel

• Fading across space

• Fading across time

magnitude

time10Ts9Ts8Ts7Ts6Ts5Ts4Ts3Ts2TsTs0

RMSs

RMSs

TT

TkTk

kki

e

e

jNNh

/20

/20

2

2212

21

1

),0(),0(

TRMS = 25 ns

T2, X T3, XT1, X

T, X2

T, X3

T, X1

July 2000


doc.: IEEE 802.15-<199>

Submission

Probe, Listen and Select (PLS)

• Frequency diversity

July 2000


doc.: IEEE 802.15-<199>

Submission

Probe, listen and select (PLS)

• Avoids microwave, 802.11(b) interference

Microwave802.11(b) interference

2402 MHz 2480 MHz

PLS selects this bandfor mode 3

July 2000


doc.: IEEE 802.15-<199>

Submission

Turbo codes• Serial concatentated convolutional code (SCCC):

– No error floor

– Choose low complexity code. Complexity less than 802.11 (b) convolutional code. Offers better performance compared to 802.11 (b) convolutional code.

– Implemented and tested the Turbo codes.

– 4 state outer and 2 state inner code

D D D

July 2000


doc.: IEEE 802.15-<199>

Submission

Simulations (AWGN)

July 2000


doc.: IEEE 802.15-<199>

Submission

Simulations (802.15.3 channel)

July 2000


doc.: IEEE 802.15-<199>

Submission

General Criteria evaluation for high speed WPAN• Unit manufacturing cost

– The RF specifications for mode 2 and mode 3 are similar to Bluetooth.

• Estimated silicon size for mode 2 base band is 10 % more than mode 1– Cost of (mode 1 + mode 2) < 1.2 X cost of Bluetooth

• Estimated silicon size for mode 3 base band is 40 % more than mode 1– Cost of (mode 1 + mode 3) < 1.5 X cost of Bluetooth

July 2000


doc.: IEEE 802.15-<199>

Submission

General Solution Criteria Comparison Values

CRITERIA Comparison Values- Same +

Unit ManufacturingCost ($)

> 2 x equivalent Bluetooth 1 1.5-2 x equivalent Bluetooth1

< 1.5 x equivalent Bluetooth1

Interference andSusceptibility

Out of the proposed band:Worse performance thansame criteria

In band: -: Interferenceprotection is less than 25 dB

Out of the proposed band:based on Bluetooth 1.0b

In band: Interferenceprotection is less than 30 dB

Out of the proposed band:Better performance thansame criteria

In band: Interferenceprotection is greater than 35dB

IntermodulationResistance

< -45 dBm -35 dBm to - 45 dBm > -35 dBm

Jamming Resistance Any 3 sources jam Any 2 sources jam. No more than 1 sourceMultiple Access No Scenarios work Handles Scenario 2 One or more of the other 2

scenarios workCoexistence Individual Sources: 0%

Total: < 3Individual Sources: 50%Total: 3

Individual Sources: 100%Total: > 3 (Total=7)

Interoperability False True N/AManufactureability Expert opinion, models Experiments Pre-existence examples,

demoTime to Market Available after 1Q2002 Available in 1Q2002 Available earlier than

1Q2002Regulatory Impact False True N/AMaturity of Solution Expert opinion, models Experiments Pre-existence examples,

demo

Scalability Scalability in 1 or less than ofthe 5 areas listed

Scalability in 2 areas of the 5listed

Scalability in 3 or more ofthe 5 areas listed

July 2000


doc.: IEEE 802.15-<199>

Submission

Phy Protocol Criteria

CRITERIA Comparison Values- Same +

Size and FormFactor

Larger Compact Flash Type 1card

Smaller

MinimumMAC/PHYThroughput

< 20 Mbps (without MACoverhead)

20 Mbps + MACoverhead

> 20 Mbps + MACoverhead

High EndMAC/PHY

Throughput (Mbps)

N/A 40 Mbps + MACoverhead

40 Mbps + MACoverhead

Frequency Band N/A (not supported byPAR)

Unlicensed N/A (not supported byPAR)

Number ofSimultaneouslyOperating Full-

Throughput PANs

< 4 4 >4

Signal AcquisitionMethod

N/A N/A N/A

Range < 10 meters > 10 meters N/ASensitivity N/A N/A N/A

Delay SpreadTolerance

< 10 ns 25 ns > 50 ns

PowerConsumption

> 1.5 watts Between .5 watt and 1.5watts

< .5 watt

July 2000


doc.: IEEE 802.15-<199>

Submission

Changes to 802.15.1 MAC

MLME

L2C AP Link M anager

LM P

Baseband

R adio

SAP Interface

L2

CA

P S

AP

SC

O S

AP

Air In terface

HC

I S

AP

LL

C S

AP

PHY

MAC

2,3

2 3

L2C

AP

SA

P

LL

C S

AP

2,3

2,3

July 2000


doc.: IEEE 802.15-<199>

Submission

BACKUP SLIDES FOLLOW

July 2000


doc.: IEEE 802.15-<199>

Submission

Interference and Susceptibility

• Out of band blocking– Mode 2, Mode 3:

• In band:

Interfering signalfrequency

Interfering signalpower

30 MHz-2000 MHz -10 dBm

2000-2400 MHz -27 dBm

2500-3000 MHz -27 dBm

3000 MHz-12.75 GHz -10 dBm

Interferencefrequency

Level

Mode 2 >= 3 MHz 35 dB

Mode 3 >= 25 MHz 35 dB

July 2000


doc.: IEEE 802.15-<199>

Submission

General evaluation criteria

• Intermodulation resistance (IM3)– Mode 2: Interfering signals at -47 dBm

– Mode 3: Interfering signals at -45 dBm

• Intermodulation resistance (IM2)– Mode 2: AM modulated signal at -32 dBm

– Mode 3: AM modulated signal at -27 dBm.

July 2000


doc.: IEEE 802.15-<199>

Submission

General evaluation criteria• Jamming resistance: Throughput of high speed WPAN as a

percentage of nominal throughput with no jamming.

• The nominal data rate for 802.15.3 is 22 Mbits/sec.– Microwave: PLS ensures 100 % throughput

– 802.15.1: Collides 20 % of the time, reducing the throughput to 80%.

– 802.15.3: Throughput reduced to 98 % due to PLS of the interference.

Mode 2 Mode 3 BluetoothMicrowave oven at 3m 95 % 100 % 95 %

802.15.1 transmitting at 1 mWwith one HV1

98 % 80 % 98 %

802.15.1 transmitting at 1 mWwith bi-directional DH5

98 % 80 % 98 %

802.15.3 transferring video 80 % 98 % 80 %802.11(a) at 100 mW 100 % 100 % 100 %802.11(b) at 100 mW 80 % 100 % 80 %

July 2000


doc.: IEEE 802.15-<199>

Submission

General evaluation Criteria• Multiple access: Desired system transmitting MPEG2 9.8

Mb/s video.

• Coexistence: Impact on other systems

Mode 3 throughput2 other systems transmitting video stream

with MPEG2100 %

2 other systems asynchronous data withpayload of 512 bytes

100 %

One system transmitting MPEG2 video andone system transmitting asynchronous data

with payload 512 bytes

100 %

Effective throughput802.15.1, HV1 voice, 1 mW 90 %

802.15.1 DH5, 1 mW 90 %802.11 (b), bidirectional data at 100

mW100 %

802.11 (a), MPEG2 at 100 mW 100 %802.11 (b), MPEG2 at 100 mW 100 %

July 2000


doc.: IEEE 802.15-<199>

Submission

Coexistence: Impact on other systems (cont’d)

• 802.15.1 HV1 voice:– B1 transmitting to B2: Signal power at B2 = -61 dBm over 1 MHz

bandwidth. Interference power at B2 = 4(dBm) - 65(loss) = -61 dBm over 14 MHz bandwidth. The C/I = -61+61+11.5 = 11.5 dB.

– B2 transmitting to B1: Signal power = -61 dBm over 1 MHz bandwidth. Interference power at B1 = 4(dBm) - 50(loss)=-46 dBm over 10 MHz bandwidth. The C/I = -61+46+11.5 = -3.5 dB.

– Hence transmission from B1 to B2 gets through while that from B2 to B1 does not. Since one 802.15.3 channel bandwidth is 1/5th of the total Bluetooth bandwidth, this occurs 20% of the time.

– Hence 802.15.1 throughput reduces to 90%.

Link between proposed radios

A1 A2

Link between interfering radios3m 10m

B1 B2

3m

July 2000


doc.: IEEE 802.15-<199>

Submission

General evaluation Criteria

• Interoperability: Can interoperate with 802.15.1.

• Technical feasibility– Manufacturability: Can be manufactured with proven

technologies.

– Time to market: Available 4Q2001.

– Regulatory impact: Full compliance with current international intentional radiator regulatory standards.

– Maturity of solution: Globally accepted concepts that will be quick to market.

– Scalability:Power consumption Scalable (real time + design time)Data rate Scalable (real time + design time)

Frequency band of operation ISM band, 2.4 GHzCost Scalable

Function Scalable (real time + design time)

July 2000


doc.: IEEE 802.15-<199>

Submission

PHY layer evaluation criteria

• Size and form factor:– Will fit on compact flash type 1 card.

• MAC/PHY throughput– Can achieve 44 Mbps

• Frequency band:– 2.4 GHz ISM band

• Number of simultaneously operating full throughput PANs– 6 PAN’s operating at 22 Mbps each

– 4 PAN’s operating at 22 Mbps each + Bluetooth

• Signal acquisition method– Similar to Bluetooth with packet header

July 2000


doc.: IEEE 802.15-<199>

Submission


• Range:– Greater than 10 meter range

• Sensitivity:– -80 dBm at bit error rate 10-8 and packet error rate 10-4

• Multipath immunity:– Delay spread tolerance more than 50 ns.

July 2000


doc.: IEEE 802.15-<199>

Submission


• Power consumption – Mode 1 (Bluetooth):

• Transmit– 40 mW peak, 20 mW average

• Receive– 65 mW peak, 3 mW average

– Mode 2• Transmit

– 80 mW peak (40 mW RF + 40 mW baseband), 40 mW average

• Receive– 106 mW peak (50 mW RF + 56 mW baseband), 53 mW average

– Mode 3• Transmit

– 135 mW (65 mW RF + 70 mW baseband) peak, 63 mW average

• Receive– 165 mW (65 mW RF + 100 mW Baseband) peak, 83 mW average

doc.: ieee 802.15- submission july 2000 anand dabak, texas instrumentsslide 1 project: ieee p802.15...

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