ITU-T Kaleidoscope Conference
Innovations in NGN
Future Challenges of IrSimple
Protocol: Efficient Flow Control
Scheme and Long Distance
Capability
Mohammad Shah Alam*, Gontaro Kitazumi
and Mitsuji Matsumoto
GITS, Waseda University, Japan
*mithu@fuji.waseda.jp
Geneva, 12-13 May 2008
Outline
NGN and WPAN
WPAN technologies
Overview of IrSimple protocol
Future Challenges of IrSimple Protocol
Conclusion and Future works
Geneva, 12-13 May 2008
First ITU-T Kaleidoscope Conference – Innovations in NGN
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NGN and WPAN
NGN
An IP based network
Supports wide range of
services over the same
network
Focuses on seamlessly
integrating the existing
wireless technologies
GS
M
NGN
W
WPAN
N
A
L
WPAN
Bluetooth
Zigbee
IrDA
Geneva, 12-13 May 2008
First ITU-T Kaleidoscope Conference – Innovations in NGN
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Comparison between different
WPAN technologies
IrDA
Bluetooth
Zigbee
ISM band
Infrared
RF (2.4 GHz)
RF (2.4 GHz)
Range
1m
(for UFIR and GigaIr, the
distance is 20cm)
Up to 10m
Up to 70m
Connection
Type, Direction
Point-to-Point, Narrow Angle
(30 degrees)
Multipoint, Omnidirectional
Multipoint, Omnidirectional
Maximum Data
Rate
100 Mbps (1Gbps will be
available soon)
1Mbps
250Kbps
Security
Line of sight requirement
ensures the security
Authentication, encryption,
spread spectrum
Authentication, encryption,
spread spectrum
Approximate
Cost
$1
$3
$1
Geneva, 12-13 May 2008
First ITU-T Kaleidoscope Conference – Innovations in NGN
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IrSimple protocol: the missing link?
IrDA has adopted 2 new protocols
IrSimple : For instant and quick (but small sized) data
transfer (i.e. transferring photo, mp3, presentation slide)
IrBurst : For large data block transfer (i.e. transferring
movie file or streaming)
How IrSimple protocol works?
IrSimple eliminates the channel listening and device
discovery procedures, required in the existing IrDA
protocols
Establishes the connection immediately to provide simple
and fast data transfer.
Geneva, 12-13 May 2008
First ITU-T Kaleidoscope Conference – Innovations in NGN
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Conversation sequence
500m s
1060m s
( A p p r o x .)
D e v ic e
d is c o v e r y
SNRM
60m s
( A p p r o x .)
SNRM
60m s
( A p p r o x .)
UA
O B E X w ith
Ir S M P
( O b je c t
E xchange)
OBEX
( O b je c t
E xchange)
UA
U I: F
B
l
o
c
k
0
B
l
o
c
k
1
U I: F
S ta n d a r d Ir D A
P r o to c o l C o n v e r s a tio n
Ir S im p le P r o to c o l
C o n v e r s a tio n
Fig. Standard IrDA and IrSimple protocol conversation
Geneva, 12-13 May 2008
First ITU-T Kaleidoscope Conference – Innovations in NGN
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Application Scenarios (1)
Fig. Object transfer between mobile phone and other devices or mobile phone
Geneva, 12-13 May 2008
First ITU-T Kaleidoscope Conference – Innovations in NGN
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Application Scenarios (2)
Source: NTT Docomo webpage
Geneva, 12-13 May 2008
First ITU-T Kaleidoscope Conference – Innovations in NGN
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Performance Comparison of IrSimple
and OBEX for various bit error rates *
1.0
Throughput Efficiency
OBEX,
t tat=0.01ms
0.9
IrSimple, t tat=0.01ms
OBEX,
t tat=0.1ms
0.8
IrSimple, t tat=0.1ms
OBEX,
t tat=1.0ms
0.7
IrSimple, t tat=1.0ms
0.6
0.5
0.4
0.3
0.2
0.1
0.0
-9
-8
-7
-6
-5
-4
BER (log)
• IrSimple has almost 64% improvement in throughput efficiency over OBEX over
100Mb/s IrDA links with a low turnaround time of 0.01ms.
* Mohammad Shah Alam, Shamim Ara Shawkat, Gontaro Kitazumi and Mitsuji Matsumoto “IrSimple Modeling and Performance
•
Evaluation for High Speed Infrared Communications”, IEEE Global Telecommunication Conference 2006 (GLOBECOM 2006)
Geneva, 12-13 May 2008
First ITU-T Kaleidoscope Conference – Innovations in NGN
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User’s Experience
6s
Previous IrDA protocol
with 4Mbps data rate
1s
IrSimple with
4Mbps data rate
Fig. Comparison of image transfer for two million pixel (500k byte) sized
photo
Geneva, 12-13 May 2008
First ITU-T Kaleidoscope Conference – Innovations in NGN
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Future Challenges of IrSimple Protocol
Efficient flow control scheme
Lower layer (link layer) instead of higher layer (IrSMP
layer)
Reduces redundant data retransmissions
Long Distance Capability
Increase link distance beyond 1 meter guaranteed by
IrDA.
The link distance can be increased in two ways
By increasing transmitted light intensity
By increasing receiver sensitivity
Geneva, 12-13 May 2008
First ITU-T Kaleidoscope Conference – Innovations in NGN
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Improving Flow Control Scheme
Fig. Existing Flow Control scheme
Fig. Proposed Efficient Flow Control scheme
Geneva, 12-13 May 2008
First ITU-T Kaleidoscope Conference – Innovations in NGN
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When Receive Ready (RR) frame from
secondary station is lost
Geneva, 12-13 May 2008
First ITU-T Kaleidoscope Conference – Innovations in NGN
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When Receive Ready (RR) frame from primary
station is lost
Geneva, 12-13 May 2008
First ITU-T Kaleidoscope Conference – Innovations in NGN
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When Data (UI) frame is lost
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First ITU-T Kaleidoscope Conference – Innovations in NGN
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Long distance capability: Increasing
Transmitted Light Intensity
Minimum luminance
in the vicinity of
1cm2
mW/cm2
0.009
0.009
0.009
0.009
0.009
0.009
0.009
The maximum
attainment distance
cm
20
30
40
50
100
200
300
Gain area
cm2
400
900
1600
2500
10000
40000
90000
Required
minimum
luminance
mW/Sr
3.6
8.1
14.4
22.5
90
360
810
The maximum
allowable luminance
mW/cm2
500
500
500
500
500
500
500
Minimum
Distance that can be
received
cm
0.08
0.13
0.17
0.21
0.42
0.85
1.27
Geneva, 12-13 May 2008
First ITU-T Kaleidoscope Conference – Innovations in NGN
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Long distance capability: Increasing
Receiver Sensitivity
Minimum quantities of light for
each cm2
mW/cm2
0.009
0.009
0.009
0.009
0.009
0.009
0.009
Standard maximum distance
cm
20
20
20
20
20
20
20
Gain area
cm2
400
400
400
400
400
400
400
mW/Sr
3.6
3.6
3.6
3.6
3.6
3.6
3.6
Minimum luminance
Distance
cm
20
30
40
50
100
200
300
Gain area
cm2
400
900
1600
2500
10000
40000
90000
1
2.25
4
6.25
25
100
225
Reception magnification
Reception radius
mm
1
1
1
1
1
1
1
Radius of antenna
mm
1
1.5
2
2.5
5
10
15
Geneva, 12-13 May 2008
First ITU-T Kaleidoscope Conference – Innovations in NGN
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Conclusion and Future Works
An improvement in the existing flow control
At IrLAP layer
To reduce redundant traffic in the system.
Can recover all possible error cases
Existing IrDA physical layer
Can support at least 3 meters distance
Increasing transmitter intensity
Increases the minimum distance between devices
Increasing receiver sensitivity
Radius of the required concentrator/lens/antenna is practical
Future works
To modify the error recovery scheme
More applications of IrSimple protocol
To complement the drawbacks of other WPAN technologies
Geneva, 12-13 May 2008
First ITU-T Kaleidoscope Conference – Innovations in NGN
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Acknowledgement
Special thanks go to Telecommunications
Advancement Foundation (TAF), Japan for
their support.
Thank You.
Geneva, 12-13 May 2008
First ITU-T Kaleidoscope Conference – Innovations in NGN
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IrDA links conversation scheme
Station A
Station B
Co n
tent
s
Download Data
Activity Time
DDAT(A)
Dead Time
Con
te
nts
Turn Around
Time TAT(A)
Data Acknowledge
DA(B)
Turn Around
Time TAT(B)
Download Data
Activity Time
DDAT(A)
Geneva, 12-13 May 2008
First ITU-T Kaleidoscope Conference – Innovations in NGN
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Current IrDA
Data Transfer Sequence
Primary
IrSimple Enhanced Burst
Data Transfer Sequence
Secondary
First Window
RR .Rsp
I Frame.Req
I Frame.Req
I Frame.Req
I Frame.Req
I Frame.Req
I Frame.Req
I Frame.Req
Next Window
RR .Rsp
I Frame.Req
I Frame.Req
I Frame.Req
Primary can send UI-Frame until Max-Turn-around-Time
I Frame.Req
I Frame.Req
I Frame.Req
I Frame.Req
I Frame.Req
I Frame.Req
I Frame.Req
Primary
Secondary
UI Frame.Req
UI Frame.Req
UI Frame.Req
UI Frame.Req
UI Frame.Req
UI Frame.Req
UI Frame.Req
UI Frame.Req
UI Frame.Req
UI Frame.Req
UI Frame.Req
UI Frame.Req
UI Frame.Req
UI Frame.Req
UI Frame.Req
UI Frame.Req
UI Frame.Req
UI Frame.Req
UI Frame.Req
UI Frame .Rsp
Geneva, 12-13 May 2008
First ITU-T Kaleidoscope Conference – Innovations in NGN
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