1. doc.: IEEE 802.15-<doc#>
<month year>
doc.: IEEE <doc#>
Project: IEEE P Working Group for Wireless Personal Area Networks (WPANs)
Submission Title: [Performance Improvement of WPAN using Enhanced CAP]
Date Submitted: [16 Sep., 2005]
Source: [Jieun Kim, Sangjae Lee, Youngae Jeon, Sangsung Choi] Company [ETRI]
Address [161, Gajeong-dong, Youseong-gu, Daejeon, Korea]
Voice: [ ], FAX: [ ],
Abstract: [The document describes an approach for using the time slots to increase the efficiency of channel time.]
Purpose: [Enhanced Contention Access Period is defined over the interval of non-allocated channel time and the channel sleep time from power management. It can give the effect of improving the data throughput.]
Notice: This document has been prepared to assist the IEEE P 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 P
J. Kim, S. Lee, Y. Jeon, S. Choi
<author>, <company>

2. Performance Improvement of WPAN using Enhanced CAP
<month year>
doc.: IEEE <doc#>
Performance Improvement of WPAN using Enhanced CAP
Jieun Kim
Sangjae Lee
Youngae Jeon
Sangsung Choi
ETRI
J. Kim, S. Lee, Y. Jeon, S. Choi
<author>, <company>

3. IEEE 802.15.3 Superframe Structure
<month year>
doc.: IEEE <doc#>
IEEE Superframe Structure
Beacon
CAP (Contention Access Period)
CTAP (Channel Time Allocation Period)
J. Kim, S. Lee, Y. Jeon, S. Choi
<author>, <company>

4. Nth Superframe in Normal Mode
<month year>
doc.: IEEE <doc#>
Nth Superframe in Normal Mode
Allocated CTA : CTA used in normal mode
Empty period : Period not used in normal mode B
CAP
Allocated
CTA
Empty
Period B
CAP
Allocated
CTA
Empty
Period
J. Kim, S. Lee, Y. Jeon, S. Choi
<author>, <company>

5. Nth Superframe in PM Mode
<month year>
doc.: IEEE <doc#>
Nth Superframe in PM Mode
Allocated CTA : CTA used in normal mode
PM CTA : CTA used in wake superframe
Sleep period : CTA not used in sleep superframe B
CAP
Allocated
CTA PM
Sleep
Period B
CAP
Allocated
CTA
Sleep
Period
J. Kim, S. Lee, Y. Jeon, S. Choi
<author>, <company>

6. doc.: IEEE 802.15-<doc#>
<month year>
doc.: IEEE <doc#>
Proposed Enhanced CAP
Unused period consists of
Empty period
Sleep period
Define unused period as enhanced CAP B
CAP
Allocated
CTA
Enhanced
Unused
Period
J. Kim, S. Lee, Y. Jeon, S. Choi
<author>, <company>

7. doc.: IEEE 802.15-<doc#>
<month year>
doc.: IEEE <doc#>
ECAP Example #1
ECAP can temporarily boost the performance of best effort applications such as :
FTP
Web surfing
Printing service B
CAP
ECAP
<Without ECAP>
<Performance enhancement with ECAP>
J. Kim, S. Lee, Y. Jeon, S. Choi
<author>, <company>

8. Expected Result of ECAP
<month year>
doc.: IEEE <doc#>
Expected Result of ECAP
ECAP enabled
J. Kim, S. Lee, Y. Jeon, S. Choi
<author>, <company>

9. doc.: IEEE 802.15-<doc#>
<month year>
doc.: IEEE <doc#>
ECAP Example #2 (1/2)
Adjacent allocated CTA has the priority of using ECAP
If the More Data bit of retransmission frame header is set to zero, ECAP will start after then
Allocated
CTA
Enhanced
CAP
Transmission Failure
Retransmission
J. Kim, S. Lee, Y. Jeon, S. Choi
<author>, <company>

10. doc.: IEEE 802.15-<doc#>
<month year>
doc.: IEEE <doc#>
ECAP Example #2 (2/2)
ECAP can improve QoS of isochronous stream by reducing the packet arrival time B
CAP
Transmission fail
Retransmission
ECAP
Transmission fail & Retransmission
<Without ECAP>
<Performance enhancement with ECAP>
J. Kim, S. Lee, Y. Jeon, S. Choi
<author>, <company>

11. Conclusion ECAP proposal Future works
Conclusion
ECAP proposal
Boost the performance of best effort applications
Improve QoS of isochronous stream
Increase the channel time efficiency
Future works
Accurate simulation model
Further details on ECAP procedure
Various application model
J. Kim, S. Lee, Y. Jeon, S. Choi

12. Thank you for your attention!
Thank you for your attention!
IT R&D Global Leader
J. Kim, S. Lee, Y. Jeon, S. Choi