intermec’s picolink wpan

Pat Kinney, Intermec Technologies

doc.: IEEE 802.15-00/205r1

Submission

Intermec’s PicoLink WPAN

MAC Overview


doc.: IEEE 802.15-00/205r1

Submission

Initial Targeted Applications for PicoLink

• Cable replacement (point to point)– Barcode scanner to portable/mobile

computer

– Printer to portable/mobile computer

• Personal area connectivity (peer to peer)

– hand held computer to numerous peripheral devices including scanners, printers, wide area network radios, etc.

SCAN EntEnt

1 2 3

0

7 8 9

4 5 6

F1 F2 F3 F4

F9 F10 F11 F12

F5 F6 F7 F8

33

PEN*KEY 6500Picking Application

Scan Item 000123456Description: Tide Liq., 50oz.Scan Location: BAY 31Enter Quantity: 40

Take to Location: Dock 5A

Keyboard Keypad Help Exit


doc.: IEEE 802.15-00/205r1

Submission

High Rate WPANsExisting WPANs

Newly Targeted Applications


doc.: IEEE 802.15-00/205r1

Submission

WPAN Solution Requirements•Very low cost

•Low power consumption

•Small size

•Minimal attach/detach times

•Interference immunity

•Ease of use

•Standardized interfaces

•Unlicensed, international usability


doc.: IEEE 802.15-00/205r1

Submission

PicoLink Concept

•Complementary to WLAN/IEEE 802.11 devices–some of the WLAN’s areas of performance have been sacrificed for cost/size/current drain

–reduced range, roaming is not optimum

•Lower complexity than WLAN devices–reduced RF specifications

–reduced MAC/PHY complexity

–this MAC has similarities to the 802.11 IBSS/adhoc

•Features which do not add recurring costs–peer to peer with up to 10 nodes per PAN


doc.: IEEE 802.15-00/205r1

Submission

Picolink Configurations

PersonalAreaNetwork

InfrastructuredNetwork

Access Point

PowerShip terminalAstra Printer

DADS Terminal

EST

PowerPad

Ethernet


doc.: IEEE 802.15-00/205r1

Submission


PersonalAreaNetwork

PowerShip terminalAstra Printer

DADS Terminal

EST

PowerPad

• Personal Area Network (PAN; Peer-to-Peer)– Multiple Networks co-habitate (20 or more have been tested, but

this attribute is dependent upon the PHY)

– Up to 10 devices in a single PAN

– Dynamic PAN and device IDs with network initiation

– Network maintained devices coming and going

– Temporary devices and NETWORKS also supported


doc.: IEEE 802.15-00/205r1

Submission


Limited InfrastructuredNetworkAccess Point

Ethernet

• Limited Infrastructured Network– Main device (access point) typically has power at all times (for

fast access)

– Support for up to 10 devices

– Ethernet access points with higher layer protocol


doc.: IEEE 802.15-00/205r1

Submission

MAC Protocol Criteria • Transparent to Upper Layer Protocols

• Ease of Use– Unique 48 bit address– Simple network join/un-join procedure– Device registration


doc.: IEEE 802.15-00/205r1

Submission

MAC Protocol Criteria • Delivered Data Throughput

– For the proposed aggregate rate of 44 Mbps a throughput of 28 Mbps is anticipated but depends upon the PHY (e.g. reducing Rx-Tx to 10µS increases throughput to 34 Mbps with 2048 byte frames)

• Fast Response – Average response time for small packets is

under 5 mS for current 1 Mbps system, projected to be less at higher data rate


doc.: IEEE 802.15-00/205r1

Submission

MAC Protocol Criteria • Data Transfer Types

– Asynchronous• short response times• CSMA/CA; collision sense/collision avoidance

(very much like 802.11)

– Isochronous (we propose a timebounded service to provide a level of QoS although CSMA presents bandwidth limitation for Isochronous operation

– Mixed traffic load management


doc.: IEEE 802.15-00/205r1

Submission

MAC Protocol Criteria • Topology

– Minimum number of active connections• Up to 10 nodes per network

– Ad hoc network• Fully supported• Temporal ad-hoc networks are also supported

– Access to portal• Any node on the network can provide a portal to

another network• Multiple portals are possible


doc.: IEEE 802.15-00/205r1

Submission

MAC Protocol Criteria • Reliability

– Master redundancy• Any node on the network can assume the

master(coordinator) role either by request from the master or by disappearance of the master

– Loss of connection• The proposed system does provide a method

for detection and recovering from the loss of a link

• System has options allowing it to conserve current drain by allowing periodic searches for link re-establishment rather than continuous searches


doc.: IEEE 802.15-00/205r1

Submission

MAC Protocol Criteria • Power Management Types

– Sleeping• Multiple time increments for sleeping are

selectable, e.g. 1,2…beacon periods

– Wakeup• Schedule service intervals allow the MAC to

adapt to various PHY wakeup times

– Polling• Beacons are scheduled and allow the nodes to

wakeup listen for any pending messages and then go back to sleep if there are no messages


doc.: IEEE 802.15-00/205r1

Submission

MAC Protocol Criteria • Power Consumption of MAC controller

– Transmit: 20 mA– Receive: 30 mA– Sleep: .3 mA– Other Power Consumption Features

• programmable search duty cycle during loss of connect

• Slave to slave links require less energy in a Peer to Peer topology than a Master/Slave topology


doc.: IEEE 802.15-00/205r1

Submission

MAC Protocol Criteria • Security

– Authentication. Propose a modified Safer algorithm be used, as in Bluetooth

– Privacy. Propose the use of the Bluetooth algorithm

• Quality of Service– Will be a function of environment

congestion


doc.: IEEE 802.15-00/205r1

Submission

MAC Protocol Criteria • Cost/Complexity

– Baseband controller– functionality described for the HR MAC is

estimated to be much less than 6,000 gates additional to the 802.15.1 MAC (10,000 gates w/o reuse).

– Code size– under 32 Kbytes in addition to the 802.15.1

MAC


doc.: IEEE 802.15-00/205r1

Submission

CRITERIA REF. Comparison Values- Same +

Transparent to UpperLayer Protocols(TCP/IP)

3.1 FALSE TRUE N/A

Unique 48-bit Address 3.2.1 Not Qualified(required by802)

Essential N/A

Simple NetworkJoin/UnJoin Proceduresfor RF enabled devices

3.2.3 Extendedprocedure forjoining 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 registration basedon profile


doc.: IEEE 802.15-00/205r1

Submission


Minimum delivered datathroughput

3.3.2 20 Mbps minusMAC overhead

20 Mbps > 20 Mbps

High end delivered datathroughput (Mbps)

3.3.3 20 – 39 Mbps 40 Mbps > 40 Mbps

Data Transfer Types 3.4 Asynchronousonly

Asynchronous orIsochronous

Mixed Mode(Asynchronous &Isochronoussimultaneously)

Topology 3.5.1 Point-to-Multipoint only

Point-to-Multipoint &Point-to-Point (with noPeer-to-Peer)

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


doc.: IEEE 802.15-00/205r1

Submission


Max. # of activeconnections

3.5.2 < 7 7 > 7

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

3.7 Does not supportpower savingsmodes

Supports 802.15.1power savings modesas specified in sections8.10.8.2-4 and11.6.6.1-5

Enhanced powersavings modes


doc.: IEEE 802.15-00/205r1

Submission


Power Consumption ofMAC controller (thepeak power of the MACcombined with anappropriate PHY)

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

< .5 watt

Authentication 3.9.1 Noauthentication

802.15.1 styleauthentication asspecified in sections8.14.4 and 9.3.2

Enhancedauthentication at MAClayer

Privacy 3.9.2 No encryption Encryption as specifiedin 802.15.1 section8.14.3 and 9.3.6

Enhanced privacy atMAC layer

Quality of Service 3.9.2 No provisionsfor QoS

Equivalent to QoSspecified in 802.15.1section 9.3.20 , 10.6.3and 11.6.6.6

Streams,priority,Controlled latency/jitterbounds, Connectionagreements, Dynamicbandwidth allocation,Selectiveretransmission,Dynamic channelselection

intermec’s picolink wpan

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