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TG3 Coexistence Capabilities

This submission presents information about the 802.15.3 draft standard for the March 2002 1394 WWG interim meeting, focusing on the high rate Wireless Personal Area Network (WPAN) standard.

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TG3 Coexistence Capabilities

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  1. Project: IEEE P802.15 Working Group for Wireless Personal Area Networks (WPANs) Submission Title: [TG3 Coexistence capabilities] Date Submitted: [19 March 2002] Source: [Pierre Gandolfo] Company [XtremeSpectrum Inc.]Address [1001 N Rengstorff Avenue, Suite 200, Mountain View, CA, 94043]Voice [(650) 230 0494], Fax [(650) 938-7071], E-mail [pgandolfo@xtremespectrum.com] [James P. K. Gilb] Company: [Appairent Technologies] Address: [9921 Carmel Mountain Rd. #247, San Diego, 92129] Voice:[1-858-538-3903], FAX: [1-858-538-3903], E-Mail:[gilb@ieee.org] Re: [] Abstract: [802.15.3 Overview – High Rate WPAN Standard.] Purpose: [To present information about the 802.15.3 draft standard for the March 2002 1394 WWG interim meeting.] 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. Pierre Gandolfo, XtremeSpecturm Inc. James P. K. Gilb, Appairent Technologies

  2. HR WPAN (802.15.3) Value Proposal High Rate WPAN enables multimedia connectivity between portables devices within personal operating space Pierre Gandolfo, XtremeSpecturm Inc. James P. K. Gilb, Appairent Technologies

  3. 802.15.3 Main Characteristics • High Rate WPAN: • Short Range (at least 10m) • High Data rates (currently up to 55Mb/s, to be increased by SG3a) • Dynamic Topology: • Mobile devices often join and leave piconet • Short connection time (<1s) • Ad-hoc network with Multimedia QoS provisions • TDMA for streams with time based allocations • Peer to peer connectivity • Multiple Power Management Modes: • Designed to support low power portable devices Pierre Gandolfo, XtremeSpecturm Inc. James P. K. Gilb, Appairent Technologies

  4. 802.15.3 Main Characteristics • Low price point, low complexity and small form factor • Secure Network: • PK authentication • Shared Key encryption (AES 128) and integrity (data and commands, SHA-2) • Ease-of-use: • Dynamic coordinator selection and handover • Key distribution and management (PK) • Does not rely on a backbone network • Designed for relatively benign multipath environment: • Personal or home space (RMS delay spread <25ns) Pierre Gandolfo, XtremeSpecturm Inc. James P. K. Gilb, Appairent Technologies

  5. 802.15.3 Main Applications • Video and audio distribution: • High speed DV transfer from a digital camcorder to a TV screen • HD MPEG2 between video players/gateways and HD display • Home theater • Computer graphics • Interactive video gaming • High speed data transfer: • MP3 players • Personal home storage • Printers & scanners • Digital still cameras to/from kiosk Pierre Gandolfo, XtremeSpecturm Inc. James P. K. Gilb, Appairent Technologies

  6. Qualities of the 802.15.3 MAC • Centralized and connection-oriented ad-hoc networking topology: • The coordinator (PNC) maintains network synchronization timing, performs admission control, assigns time for connection between 802.15.3 devices (DEV), manages PS requests,… • DEV’s, which are not required to be coordinator capable • Communication is peer to peer • Support for multimedia QoS: • TDMA superframe architecture with Guaranteed Time Slots (GTS) • Authentication, encryption and integrity • Multiple power saving modes (asynchronous and synchronous) • Multiple ACK policies (No ACK, Imm-ACK, Del-ACK and implied ACK) • Simplicity: • All QoS negotiations and flow control handling are done at layer 3 • PNC only handles channel time requests • Robustness: • Dynamic channel selection, TX power control per link • PNC handover Pierre Gandolfo, XtremeSpecturm Inc. James P. K. Gilb, Appairent Technologies

  7. Scalable Security Capabilities • Mode 0 is no security • Mode 1 allows the user to restrict access to the piconet • Mode 2 provides cryptographic authentication and command integrity. • Mode 3 provides data protection, command and data integrity as well as authentication. This mode also allows the use of digital certificates. • The security modes above mode 0 are optional Pierre Gandolfo, XtremeSpecturm Inc. James P. K. Gilb, Appairent Technologies

  8. Superframe Structure Time-slotted superframe structure consists of 3 sections: • Beacon: • transmits control information to the entire piconet, allocates resources (GTS) per stream ID for the current superframe and provides time synchronization • Optional CAP (CSMA/CA): • used for authentication/association request/response, stream parameters negotiation,… (command frames) • PNC can replace the CAP with MTS slots using slotted Aloha access • CFP made of: • Unidirectional Guaranteed Time Slots (GTS) assigned by the PNC for isochronous or asynchronous data streams • Optional Management Time Slots (MTS) in lieu of the CAP for command frames Pierre Gandolfo, XtremeSpecturm Inc. James P. K. Gilb, Appairent Technologies

  9. GTS and MTS Slots • GTSs may have different persistence • Dynamic GTS: position in superframe may change from superframe to superframe (Beacon CTA IE or broadcast channel time Grant command) • Pseudo-static GTS (isochronous streams): PNC may change the GTS positions, but needs to communicate and confirm with both Tx and Rx DEVs • Variable guard times between adjacent slots to prevent collision (clock drift) • MTS • Open & dedicated MTS: Used for PNC/DEV communication • Association MTS • Number of MTS per superframe is controlled by the PNC Pierre Gandolfo, XtremeSpecturm Inc. James P. K. Gilb, Appairent Technologies

  10. 1 1 1 1 2 2 1 1 Stream Request ID Stream Index Stream CTR Control SPS Set Index CTR Interval CTR Time Unit Minimum CTR Time Units Desired CTR Time Units Channel Time Request Command Octets: 1 Target DEVID • Command directly sent to the PNC for the stream <source DEV-ID, Target DEV-ID, Stream index> • Stream CTR Control: • Indicates if this is a request for the creation of a new stream or the modification of an existing stream, • Also contains the “CTR interval type” field that specifies the number of slots per superframe (0) or the number of superframes per slot (1), • Selects the GTS type (pseudo-static or dynamic) • CTR time Unit: Unit of time used by the device. Ex: [frame, ACK, SIFS] • Min Channel Time Request = CTR_Time_Unit * Min. CTR units Pierre Gandolfo, XtremeSpecturm Inc. James P. K. Gilb, Appairent Technologies

  11. 2.4GHz PHY • 5 selectable data rates: • 11, 22, 33, 44, 55 Mb/s • 11 Msymbol/s • Modulation formats: BPSK, QPSK (no coding), 16, 32, 64-QAM (8-state Trellis code) • 15 MHz channel bandwidth • 3 or 4 non-overlapping channel • Transmit Power: approximately 8 dBm • Coexistence: • Compared to 802.11, an 802.15.3 2.4GHz PHY system causes less interference since it occupies a smaller bandwidth and transmits at lower power levels • Provides for dynamic channel selection • Per link dynamic power control Pierre Gandolfo, XtremeSpecturm Inc. James P. K. Gilb, Appairent Technologies

  12. Alternate PHY Study Group (802.15.3a) • 802.15.3 has created a Study Group to investigate the creation of an alternate PHY to address very high data rate applications • Goal of > 100Mbps @ 10 m, > 400 Mbps @ 5 m • 1394a, USB2.0 HS cable replacement • DV50, DV100, HD DVD, High resolution printer and scanner, fast download speed for MP3 players, digital still cameras • Currently reviewing Application Presentations and developing requirements documents • Expect to establish a Task Group in July • UWB is a potential candidate for these VHR WPAN applications Pierre Gandolfo, XtremeSpecturm Inc. James P. K. Gilb, Appairent Technologies

  13. Living Room Cluster Kids’ room Cluster 802.11a/e or HL2_DM Bridge Wireless 1394 Bus • 802.15.3/a to interconnect multiple 1394 wireless devices within a room • HL2-DM or 802.11a/e as a bridge to interconnect multiple clusters located in different rooms • Isochronous resource Manager (selected PNC) will allocate bandwidth • The Wireless Cycle Master role within a cluster can be played by any DEV • 802.15.3 1394 CL may or may not support bridging • Will support Bus reset and allocation of 1394 Physical-ID for the piconet • Address Resolution Protocol will not be implemented in the MAC Pierre Gandolfo, XtremeSpecturm Inc. James P. K. Gilb, Appairent Technologies

  14. Wireless 1394 Implementation Applications Configure & Error Control Rd, Wr, lock • The Convergence Sublayer (1394 SSCS) is needed to mimic the functions provided by the 1394 link layer • Services & primitives provided by 1394 SSCS are a subset of those provided by the wired 1394 physical & link stacks (no cable environment) • 1394 SSCS would transport wired-1394 asynchronous & isochronous packets over the wireless network and also provide 1394 clock distribution Video Codec Transaction Layer Asynchronous Port Serial Bus Mgmt (Bus Mnger, IRM, Node Controller) Synchronous Port FW 1394-SSCS FW/HW MAC CPS MAC PHY Pierre Gandolfo, XtremeSpecturm Inc. James P. K. Gilb, Appairent Technologies

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