Doc.:IEEE 802.15-00/208r1July 2000 Submission Walt Davis, Motorola Slide 1 Project: IEEE P802.15 Working Group for Wireless Personal Area Networks (WPANs)

doc.:IEEE 802.15-00/208r1July 2000

Submission Walt Davis, MotorolaSlide 1

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: [MAC proposal for the High Rate 802.15 Standard]Date Submitted: [July 2000]Source: [Walt Davis] Company: [Motorola]Address: [1303 E. Algonquin Road, Fourth Floor, Schaumburg, IL 60196]Voice:[(847) 576-3311], FAX: [(847) 576-5292], E-Mail:[[email protected]]

Re: [ MAC layer submission, in response of the Final Call for Proposal ]

Abstract: [This contribution is a WPAN proposal for a high performance 30 Megabit per second, 5GHz system that addresses the requirements of a large number of wireless multimedia applications. The system is based on proven, low cost RF technology at the Physical Layer level, and on an extension of the BlueTooth TDMA protocol at the MAC layer. It provides for real-time transport of a number of real-time data streams while offering the advantages of quick time to market via the use of proven technology and low system cost due to the use of simple receivers and transmitters. It also provides for the low power drain that is essential for personal portable applications by making extensive use of protocol based battery saving techniques.]

Purpose: [Response to WPAN-HRSG Call for Applications]

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.

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Submission Walt Davis, Motorola

Motorola, Inc.

MAC Layer Submissionto the IEEE P802.15

Wireless Personal Area NetworksHigh Rate Working Group

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Wireless Multimedia Application• Basic Requirement:

Enable the high-speed, wireless interconnection of consumer devices to support the transfer of large multi-media data files and high speed, real-time data streams.

• Typical Applications:– Video distribution from set-top boxes to remote

TV sets, VCR to portable screen, computer to projector, etc.

– In-home Internet connectivity from set-top boxes to

personal devices and computers

– Wireless video camera linkages

– Wireless Audio and Video distribution for

Home Theater Systems

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Wireless Multimedia Application• Basic Requirement:

Enable the high-speed, wireless interconnection of consumer devices to support the transfer of large multi-media data files and high speed, real-time data streams.

• Applications:– Low cost, high speed networking

• Communications devices to peripherals

• Computer to computer

• Computer to printer

• Digital camera to printer

• Appliance to appliance

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Application Requirements

Physical Layer• Operating Frequencies

• RF Range / Coverage

• Number of channels

• Channel Noise Immunity– Error Tolerance– Delay Spread

Tolerance

• Security

• Co-existence / compatibility

with other systems

• Operating frequency /

license requirements

System• Transparent System

Operation

• QoS

• Data Throughput Rate

• System Range / Coverage

• Cost

• Security

• Low Power

• Low Complexity

• Low Development risk

• Time to Market

Categories

MAC Layer• QoS

• Security

• Low Complexity

• Low Development risk• Cost

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System Features• Time shared, collision free channel access

• High network utilization and low overhead - 86% to

93% throughput dependent on packet size

• Isochronous, multimedia data support

• Completely QoS oriented stream support

• Mesh network topology supports peer-to-peer, point-

to-point and point-to-multipoint operation

• Multicast support using shadow client mode

• Alternate master devices for master redundancy

• Privacy and Security

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Quality of Service (QoS) Features

• Packet Sequence Preservation

• Dynamic BW negotiation

• Guaranteed Bandwidth for Isochronous Streams

• Guaranteed Max Latency for Isochronous Streams

• Dynamically Configurable Selective ARQ

• Traffic Monitoring

• Priority Services - Four Levels of Priority

• Dynamic Channel Change

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TDMA BASED SIGNALING PROTOCOL

MasterRemote 1

Remote 2

Remote 3

Master

Remote 1

Remote 2

Remote 3

ChannelActivity

Time

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1. .System Operation:

The proposed Medium Access Layer, together with the Physical Layer, form a Wireless Personal Area Network system that is targeted at meeting the requirements of high data rate multi-media applications. In particular, it is focused providing a system that can simultaneously deliver up to 63 streams of data, including:

Several (at least three) MPEG encoded real-time video streams, plus

Several channels of digital audio, plus

Several voice telephony channels, plus

Several computer data streams that may be associated with an interactive Internet session or with simple data file transfers.

Description of MAC Layer Submission

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802.15.1MAC

802.15.1PHY

802.15.3MAC

802.15.3

PHY

802.1 Bridging

802.2 LLC

=/>20

Mbit/s

=/<1

Mbit/s

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reQuestSlot

Network Frame Network Frame Network Frame

One Network Frame

Tx Slot, zoomed to define each device’s tx duration

Tx Slot for device-1 Tx Slot for device-2 Tx Slot for device-n

Packet Body

Radio data frame

Pre

Stream1 Stream2 Stream3 Stream4

BitSync

SourceID

32 bits 32 bits 48 bits 48 bits

DestID Lgth CRC ECC

16bits 16bits

Structure of the Dynamic TDMA Slot System

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reQuestSlot

Radiodataframe

Network Frame

Isoch-Slot n1Non-Isoch

Slot nm

Network Frame Network Frame

One Network Frame

Tx Slot

Tx Slot for device-1 Tx Slot for device-2 Tx Slot for device-n

Isoch-Slot n2

Isochronous and Non-Isochronous Data Slots

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Description of MAC Layer SubmissionQoS - Dynamically Configurable ARQ

• Stream level decision• Selective ARQ request from the receiver• Buffering of non-acknowledged packets at tx• Number of re-tx attempts dynamically negotiable

P1 P2 P3 P4 P5 P2 P5 P6

lost

P2, P5 - Not ACKedrest ACKed

Re-tx

ACKedup to P5

Stream n to device i from device j Stream n to device i from device j

lost

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Description of MAC Layer SubmissionQos - Priority Services

Device-1 Device-2 ReQuest slot

I

(a) Data for packets are collected and sorted into buffer queues according to payload differentiation

(b) Packets are then transmitted according to sorting scheme by the Dynamic Rate Manager through the network

High (H)priority

Medium (M)priority

Low (L)priority

I H H H H M M I H H H H M M LL

Network Frame Network Frame Network Frame

Isoch (I)

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QoS - Channel ProtectionFEC Features:

• 255 Symbol Reed-Solomon Block Coding– Comparable to DSS Satellite Video Broadcasting FEC

• Improve BER from 10E-6 to 10E-11– 1/1,000,00 to 1/10,000,000,000

• Can be negotiated to increase the protection rate through reduction of FEC block size for the same number of redundancy symbols


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Description of MAC Layer SubmissionQos - Channel Change Procedure

Frequency Spectrum

Channel 1 Channel 2 (More channels)

• All devices measure the channel and send feedback to the master device• Master device decides to change the channel based on the feedback and its own measurements• Master device informs all the client devices to “remain quiet”• Master device looks for another free channel• If a free channel is found, Master device informs all the client devices to move over to the new channel• If no other free channel, master device resumes operation in the original

channel

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Alternate Master Device

Master

Client A

Master

Master

Client A

Client B(Alt Master)

No Single Point of Failure

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Master

Client - C1

Master in RX mode waiting for request Client - C2

Network Frame

No Radio Transmit - Entire Frame is reQuest slot

Network Frame

Network idle, no activity

Theory of Operation

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Client 1 Requests Video

Master Client - C1C1 Requests a video stream

Connection Request

Connection Grant

Master Client - C1C1 Receives VIDEO Stream

VIDEO

Control

C

Bea

con

V C

C1

C

Bea

con

V C

C1reQuest slot

Client 1 views MPEG movie on Master

Network Frame Network Frame

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Master Client - C1Connection Request

Connection Grant

Master Client - C2Acknowledgement

Connection Data

C1 views MPEG movieon Master

C1 requests Digital Photo file transfer to

C2’s laser printer


Client 1 Requests Print File Transfer

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Master Client - C1VIDEO

Client - C2

Print Data

Network Frame

C

Bea

con

C

Bea

con

V C

C1

V C

C1

reQ

uest

slo

tPDPD C

C2

D

C1 views MPEG movieon Master

C1 prints Digital Photo on

C2’s laser printer

Network Frame


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Description of Physical Layer Submission

Channel

SourceEncode

ChannelEncode

Tx_Signal

Modulate

Encrypt

Transmit

Rx_Signal

ChannelDecode

SourceDecode

Receive

Demodulate

Decrypt

Physical Layer Data Flow Model

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MAC Protocol Criteria Evaluation

CRITERIA REF. Comparison Values- Same +

Transparent to UpperLayer Protocols(TCP/IP)

3.1 FALSE TRUE N/A

Unique 48-bitAddress

3.2.1 Not Qualified(required by 802)

Essential N/A

Simple NetworkJoin/UnJoinProcedures for RFenabled devices

3.2.3 Extended procedurefor joining network

802.15.1 style join asspecified in sections8.10.6, 9.3.23 and11.6.5.5

Enhanced self-configuration ofnetwork

Device Registration 3.2.3 Requires manualconfiguration

802.15.1 styleregistration asspecified in sections8.10.7 and 11.6.5.1-4.

Auto registrationbased on profile

Minimum delivereddata throughput

3.3.2 20 Mbps minusMAC overhead

20 Mbps > 20 Mbps

High end delivereddata throughput(Mbps)

3.3.3 20 – 39 Mbps 40 Mbps > 40 Mbps

Data Transfer Types 3.4 Asynchronous only Asynchronous orIsochronous

Mixed Mode(Asynchronous &Isochronoussimultaneously)

Topology 3.5.1 Point-to-Multipointonly

Point-to-Multipoint&Point-to-Point (withno Peer-to-Peer)

Point-to-Multipoint,Point-to-Point &Peer-to-Peer

Max. # of activeconnections

3.5.2 < 7 7 > 7

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General Solution Criteria Comparison Values

CRITERIA REF. Comparison Values- Same +

Ad-Hoc Network 3.5.3 FALSE TRUE N/AAccess to a Portal 3.5.4 FALSE TRUE N/AMaster Redundancy 3.6.2 FALSE TRUE N/ALoss of Connection 3.6.3 FALSE TRUE N/APower ManagementTypes

3.7 Does not supportpower savingsmodes

Supports 802.15.1power savings modesas specified insections 8.10.8.2-4and 11.6.6.1-5

Enhanced powersavings modes

Power Consumptionof MAC controller(the peak power ofthe MAC combinedwith an appropriatePHY)

3.8 > 1.5 watts Between .5 watt and1.5 watts

< .5 watt

Authentication 3.9.1 No authentication 802.15.1 styleauthentication asspecified in sections8.14.4 and 9.3.2

Enhancedauthentication atMAC layer

Privacy 3.9.2 No encryption Encryption asspecified in 802.15.1section 8.14.3 and9.3.6

Packet encryption

Quality of Service 3.9.2 No provisions forQoS

Equivalent to QoSspecified in 802.15.1section 9.3.20 , 10.6.3and 11.6.6.6

802.11e level ofQoS

Documents

Doc.:IEEE 802.15-00/208r1July 2000 Submission Walt Davis, Motorola Slide 1 Project: IEEE P802.15 Working Group for Wireless Personal Area Networks (WPANs)