Transcript doc.: IEEE 802.15-00/205r1 Intermec’s PicoLink WPAN MAC Overview Submission Pat Kinney, Intermec Technologies doc.: IEEE 802.15-00/205r1 Initial Targeted Applications for PicoLink Ent • Cable replacement (point to point) Ent F1 –

doc.: IEEE 802.15-00/205r1
Intermec’s PicoLink WPAN
MAC Overview
Submission
Pat Kinney, Intermec Technologies
doc.: IEEE 802.15-00/205r1
Initial Targeted Applications for
PicoLink
Ent
• Cable replacement (point to point)
Ent
1
2
4
5
7
8
9
3
0
3
F1
– Barcode scanner to portable/mobile
computer
– Printer to portable/mobile computer
SCAN
F2
3
6
F3
F4
F5
F6
F7
F8
F9
F10
F11
F12
• Personal area connectivity (peer to
peer)
– hand held computer to numerous peripheral
devices including scanners, printers, wide
area network radios, etc.
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Submission
Pat Kinney, Intermec Technologies
doc.: IEEE 802.15-00/205r1
Newly Targeted Applications
Existing WPANs
High Rate WPANs
Submission
Pat Kinney, Intermec Technologies
doc.: IEEE 802.15-00/205r1
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
Submission
Pat Kinney, Intermec Technologies
doc.: IEEE 802.15-00/205r1
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
Submission
Pat Kinney, Intermec Technologies
doc.: IEEE 802.15-00/205r1
Picolink Configurations
Personal
Area
Network
PowerPad
DADS Terminal
Astra Printer
PowerShip terminal
EST
6700
Ethernet
Infrastructured
Network
Access
Point
Submission
Pat Kinney, Intermec Technologies
doc.: IEEE 802.15-00/205r1
Picolink Configurations
Personal
Area
Network
PowerPad
DADS Terminal
Astra Printer
PowerShip terminal
EST
• 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
Submission
Pat Kinney, Intermec Technologies
doc.: IEEE 802.15-00/205r1
Picolink Configurations
6700
Ethernet
Access
Point
Limited
Infrastructured
Network
• 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
Submission
Pat Kinney, Intermec Technologies
doc.: IEEE 802.15-00/205r1
MAC Protocol Criteria
• Transparent to Upper Layer Protocols
• Ease of Use
– Unique 48 bit address
– Simple network join/un-join procedure
– Device registration
Submission
Pat Kinney, Intermec Technologies
doc.: IEEE 802.15-00/205r1
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
Submission
Pat Kinney, Intermec Technologies
doc.: IEEE 802.15-00/205r1
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
Submission
Pat Kinney, Intermec Technologies
doc.: IEEE 802.15-00/205r1
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
Submission
Pat Kinney, Intermec Technologies
doc.: IEEE 802.15-00/205r1
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
Submission
Pat Kinney, Intermec Technologies
doc.: IEEE 802.15-00/205r1
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
Submission
Pat Kinney, Intermec Technologies
doc.: IEEE 802.15-00/205r1
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
Submission
Pat Kinney, Intermec Technologies
doc.: IEEE 802.15-00/205r1
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
Submission
Pat Kinney, Intermec Technologies
doc.: IEEE 802.15-00/205r1
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
Submission
Pat Kinney, Intermec Technologies
doc.: IEEE 802.15-00/205r1
CRITERIA
REF.
-
Transparent to Upper
Layer Protocols
(TCP/IP)
Unique 48-bit Address
3.1
FALSE
3.2.1
Simple Network
Join/UnJoin Procedures
for RF enabled devices
3.2.3
Not Qualified
(required by
802)
Extended
procedure for
joining network
Device Registration
3.2.3
Submission
Requires manual
configuration
Comparison Values
Same
TRUE
N/A
Essential
N/A
802.15.1 style join as
specified in sections
8.10.6, 9.3.23 and
11.6.5.5
802.15.1 style
registration as
specified in sections
8.10.7 and 11.6.5.1-4.
Enhanced selfconfiguration of
network
+
Auto registration based
on profile
Pat Kinney, Intermec Technologies
doc.: IEEE 802.15-00/205r1
CRITERIA
REF.
20 Mbps minus
MAC overhead
20 – 39 Mbps
Comparison Values
Same
20 Mbps
> 20 Mbps
40 Mbps
> 40 Mbps
Mixed Mode
(Asynchronous &
Isochronous
simultaneously)
Point-to-Multipoint,
Point-to-Point &
Peer-to-Peer
+
Minimum delivered data
throughput
High end delivered data
throughput (Mbps)
Data Transfer Types
3.3.2
3.4
Asynchronous
only
Asynchronous or
Isochronous
Topology
3.5.1
Point-toMultipoint only
Point-to-Multipoint &
Point-to-Point (with no
Peer-to-Peer)
Submission
3.3.3
Pat Kinney, Intermec Technologies
doc.: IEEE 802.15-00/205r1
CRITERIA
REF.
-
Max. # of active
connections
Ad-Hoc Network
Access to a Portal
Master Redundancy
Loss of Connection
Power Management
Types
Submission
3.5.2
<7
3.5.3
3.5.4
3.6.2
3.6.3
3.7
FALSE
FALSE
FALSE
FALSE
Does not support
power savings
modes
Comparison Values
Same
7
TRUE
TRUE
TRUE
TRUE
Supports 802.15.1
power savings modes
as specified in sections
8.10.8.2-4 and
11.6.6.1-5
+
>7
Enhanced
N/A
Enhanced
N/A
Enhanced power
savings modes
Pat Kinney, Intermec Technologies
doc.: IEEE 802.15-00/205r1
CRITERIA
REF.
> 1.5 watts
Power Consumption of
MAC controller (the
peak power of the MAC
combined with an
appropriate PHY)
Authentication
3.8
3.9.1
No
authentication
Privacy
3.9.2
No encryption
Quality of Service
3.9.2
No provisions
for QoS
Submission
Comparison Values
Same
Between .5 watt and
1.5 watts
802.15.1 style
authentication as
specified in sections
8.14.4 and 9.3.2
Encryption as specified
in 802.15.1 section
8.14.3 and 9.3.6
Equivalent to QoS
specified in 802.15.1
section 9.3.20 , 10.6.3
and 11.6.6.6
+
< .5 watt
Enhanced
authentication at MAC
layer
Enhanced privacy at
MAC layer
Streams,
priority,
Controlled latency/jitter
bounds, Connection
agreements, Dynamic
bandwidth allocation,
Selective
retransmission,
Dynamic channel
selection
Pat Kinney, Intermec Technologies