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Project: IEEE P802.15 Working Group for Wireless Personal Area Networks (WPANs)

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]

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Project: IEEE P802.15 Working Group for Wireless Personal Area Networks (WPANs)

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  1. 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

  2. Performance Improvement of WPAN using Enhanced CAP Jieun Kim Sangjae Lee Youngae Jeon Sangsung Choi ETRI J. Kim, S. Lee, Y. Jeon, S. Choi

  3. Beacon CAP (Contention Access Period) CTAP (Channel Time Allocation Period) IEEE 802.15.3 Superframe Structure J. Kim, S. Lee, Y. Jeon, S. Choi

  4. Allocated CTA : CTA used in normal mode Empty period : Period not used in normal mode B CAP Allocated CTA Allocated CTA Allocated CTA B CAP Allocated CTA Empty Period Allocated CTA B B CAP Allocated CTA Empty Period Allocated CTA B CAP Allocated CTA Empty Period Allocated CTA Nth Superframe in Normal Mode J. Kim, S. Lee, Y. Jeon, S. Choi

  5. 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 CTA Allocated CTA B CAP Allocated CTA Sleep Period Allocated CTA B B CAP Allocated CTA PM CTA Allocated CTA B CAP Allocated CTA Sleep Period Allocated CTA Nth Superframe in PM Mode J. Kim, S. Lee, Y. Jeon, S. Choi

  6. Unused period consists of Empty period Sleep period Define unused period as enhanced CAP B B CAP CAP Allocated CTA Allocated CTA Enhanced CAP Unused Period Allocated CTA Allocated CTA B B Proposed Enhanced CAP J. Kim, S. Lee, Y. Jeon, S. Choi

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

  8. Expected Result of ECAP ECAP enabled J. Kim, S. Lee, Y. Jeon, S. Choi

  9. Allocated CTA Enhanced CAP CAP Transmission Failure Retransmission CTA CAP 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 J. Kim, S. Lee, Y. Jeon, S. Choi

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

  11. 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 Conclusion J. Kim, S. Lee, Y. Jeon, S. Choi

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

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