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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: [Comparison of Responses to Task Group 802.15.4j Call for Proposals] Date Submitted: [11 May 2011] Source: [Ray Krasinski] Company [Philips]

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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: [Comparison of Responses to Task Group 802.15.4j Call for Proposals] Date Submitted: [11 May 2011] Source: [Ray Krasinski] Company [Philips] Address [345 Scarborough Road, Briarcliff Manor, NY, USA] Voice:[1-914-333-9687], E-Mail:[raymond.krasinski@philips.com] Re: Comparison of TG 4j Call for Proposals responses Abstract: An overview of the areas of agreement between responses to the TG4j CFP and areas in need of further discussion. Purpose: To outline the points of agreement and differences between the TG4j CFP responses to help drive discussion of the proposals and help move towards consensus. 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. Ray Krasinski, Philips

  2. Comparison of Responses to 802.15.4j Call for Proposals Ray Krasinski, Philips

  3. Content • TG4j RFP Response Requirements • Term Comparison • PHY Areas of Agreement • PHY Areas in Need of Further Discussion • MAC Areas of Agreement • MAC Areas in Need of Further Discussion Ray Krasinski, Philips

  4. TG 4j Technical Requirements 15-11-0064 • Compliance with: • FCC MBANS Rules • Part 95 Subpart M – Medical Body Areas Network Service (device control) • Amendments to technical requirements covering transmit frequencies, emissions, transmit powers etc • TG4j PAR and 5 Criteria • Physical Layer • Compliant to the existing 802.15.4 DSSS PHY employing O-QPSK, operating in the 2450 MHz band • MAC Layer • Only additional MAC requirements to support the Physical Layer: To be defined Ray Krasinski, Philips

  5. Terms - A healthcare facility may have multiple PAN Coordinators but is expected to have only one Control Point. - The Band Coordinator is an independent entity, selected by the FCC, to manage the MBANS band. See 15.11-0341-02, slide 6 for a detailed definition of the Band Coordinator Ray Krasinski, Philips

  6. Comparison of Proposals - PHY Ray Krasinski, Philips

  7. Areas of Agreement - PHY • Use of 802.15.4 2450MHZ DSSS PHY • 5 Mhz channel spacing • 16-ary based OQPSK Modulation • 32 I and Q chips for 250kbps Ray Krasinski, Philips

  8. Areas in Need of Further Discussion - PHY • Channelization Plan • Forward Error Code • Block Interleave Ray Krasinski, Philips

  9. LG-Philips Channelization Proposal 2360.5 2360 MHz 2400 2399.5 MHz • For in-hospital deployment • 15 channels defined to promote coexistence with AMT • Non-overlapping channels will be used in entire 2360-2400 MHz band • For out-of-hospital deployment • Overlapping channels in 2390–2400 MHz band offers flexibility to avoid interference • Low deployment density and low duty cycle will assist MBANS coexistence 2360 MHz 2390 MHz 2400 MHz 5 (2388) 10 (2382) 3 (2378) 8(2372) 12 (2392) 1 (2368) 13 (2397) 6 (2393) 0 (2363) 4 (2383) 9 (2377) 7 (2367) 14 (2395) 11 (2387) 2 (2373) AMT spectrum Amateur radio spectrum Guard bands 15.4j channels Ray Krasinski, Philips

  10. Samsung Channelization Proposal • 5 MHz channel spacing • 2 sets of overlapping bands with an offset of 2 MHz • 7 channels in each set (2395 MHz channel used in both sets) • One set selected • Different preambles for different sets 5 MHz 5 MHz Ray Krasinski, Philips

  11. Forward Error Correction (FEC) Code • Description: Add forward error correction codes to decrease transmission errors • Proposed Changes to 802.15.4: • Systematic hamming codes (15,11) • Optional decoder at receiver Ray Krasinski, Philips

  12. Block Interleave • Description: Interleave blocks to decrease burst errors • Proposed Changes to 802.15.4: • Interleaving in 60 bits blocks • 4 blocks of 15 bits will be interleaved into 4 different blocks Ray Krasinski, Philips

  13. Comparison of Proposals - MAC Ray Krasinski, Philips

  14. Areas of Agreement - MAC • Need for addition of PHY Information Base (PIB) attribute Ray Krasinski, Philips

  15. Areas in Need of Further Discussion -MAC • Multi-Periodic GTS • Mutual Broadcast Periods • Easy Pairing • Unslotted & Slotted CSMA-CA at Nonbeacon-enabled PAN • Service Based Discovery • Coordinator Switching • Channel Switch Notification • Congestion Avoidance Ray Krasinski, Philips

  16. Multi-Periodic GTS • Description: Increase efficiency of GTS in 15.4 by allowing for periodic GTS. • Proposed Changes to 802.15.4: • Add octet to the GTS Characteristics field (in GTS request command frame) to define multi-periodic GTS parameter • 3 bits used to define the GTS period (5 bits are reserved) • The GTS period that is assigned to a node is P = 2N where N is the value defined by the 3 bits • GTS Specification field (in Beacon frame): Use reserved bit 6 as a multi-periodic GTS permit • GTS List field (in Beacon frame): Redefine the GTS Length field to indicate when the first periodic GTS is available Ray Krasinski, Philips

  17. Easy Pairing • Description: Method of pairing a Device to a Hub in a convenient manner. A portable device is used as a carrier for pairing information • Proposed Changes to 802.15.4: • 3 new commands: • Grant Association Proxy Authority • Association Proxy Request • Association Proxy Response Ray Krasinski, Philips

  18. Mutual Broadcast Periods • Description: Enhanced channel access method to minimize back-offs. Provide contention balancing. • Proposed Changes to 802.15.4: • Additional period using CSMA-CA for mutual broadcasting among devices • CSMA-CA with shorter back-off slot length • 3 different types of CAPs • Exclusive CAP • Normal CAP • Background CAP Ray Krasinski, Philips

  19. Unslotted & Slotted CSMA-CA at Nonbeacon-enabled PAN • Description: Synchronized channel access mechanism at Nonbeacon-enabled PAN • Proposed Changes to 802.15.4: • Pulse-Coupled Oscillator synchronization needed at MAC layer Ray Krasinski, Philips

  20. Service Based Discovery • Description: If there are multiple PAN Coordinators, a method for a device selecting a PAN Coordinator based on its service type • Proposed Changes to 802.15.4: • Service ID added to Beacon Frame (2 bit) Ray Krasinski, Philips

  21. Coordinator Switching • Description: Proactive method to establish a connection to a new Hub if the connection to the Hub is lost. Active method to check quality of connection or PAN ID conflict and request change. • Proposed Changes to 802.15.4: • Active: Change information (channel number, PAN ID, etc) is broadcasted in beacon frame with realignment command when switch needed • Proactive: Setting priority of selected replacement Hubs in the device and transmitting the priority to the selected replacement Hub Ray Krasinski, Philips

  22. Channel Switch Notification • Description: A channel switch command with time and channel information. • Proposed Changes to 802.15.4: • A new channel switch notification command • Plus an additional MAC primitive Ray Krasinski, Philips

  23. Congestion Avoidance • Description: A method of avoiding congestion at a relay Hub by broadcasting a response signal comprising congestion-related information from the Hub with respect to data transmitted to the Hub and using this information to better avoid congestion • Proposed Changes to 802.15.4: • Add congestion related information Ray Krasinski, Philips

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