doc.: IEEE 802.15-<doc#> <month year> doc.: IEEE 802.15-<doc#> 2005-09-16 Project: IEEE P802.15 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: [+82-42-860-1564], FAX: [+82-42-860-5218], E-Mail: [kje63247@etri.re.kr, leestrike@etri.re.kr, yajeon@etri.re.kr, sschoi@etri.re.kr] 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 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. J. Kim, S. Lee, Y. Jeon, S. Choi <author>, <company>

Performance Improvement of WPAN using Enhanced CAP <month year> doc.: IEEE 802.15-<doc#> 2005-09-16 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>

IEEE 802.15.3 Superframe Structure <month year> doc.: IEEE 802.15-<doc#> 2005-09-16 IEEE 802.15.3 Superframe Structure Beacon CAP (Contention Access Period) CTAP (Channel Time Allocation Period) J. Kim, S. Lee, Y. Jeon, S. Choi <author>, <company>

Nth Superframe in Normal Mode <month year> doc.: IEEE 802.15-<doc#> 2005-09-16 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>

Nth Superframe in PM Mode <month year> doc.: IEEE 802.15-<doc#> 2005-09-16 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>

doc.: IEEE 802.15-<doc#> <month year> doc.: IEEE 802.15-<doc#> 2005-09-16 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>

doc.: IEEE 802.15-<doc#> <month year> doc.: IEEE 802.15-<doc#> 2005-09-16 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>

Expected Result of ECAP <month year> doc.: IEEE 802.15-<doc#> 2005-09-16 Expected Result of ECAP ECAP enabled J. Kim, S. Lee, Y. Jeon, S. Choi <author>, <company>

doc.: IEEE 802.15-<doc#> <month year> doc.: IEEE 802.15-<doc#> 2005-09-16 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>

doc.: IEEE 802.15-<doc#> <month year> doc.: IEEE 802.15-<doc#> 2005-09-16 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>

Conclusion ECAP proposal Future works 2005-09-16 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

Thank you for your attention! 2005-09-16 Thank you for your attention! http://www.etri.re.kr IT R&D Global Leader J. Kim, S. Lee, Y. Jeon, S. Choi