Doc.: IEEE 802. 15-12-0247-02-004m May 2012 Ben Rolfe (BCA) Project: IEEE 802.15 Working Group for Wireless Personal Area Networks (WPANs) Submission Title:

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Doc.: IEEE m May 2012 Ben Rolfe (BCA) Project: IEEE Working Group for Wireless Personal Area Networks (WPANs) Submission Title: Support for Ranging in TVWS (4TV) Date Submitted: 13 May 2012 Source: [Benjamin Rolfe] Company [BCA] Address [PO Box 798 Los Gatos CA 95031] Voice:[ ], FAX: [], blindcreek.com] Re: [TG4mCall for Proposals proposals.doc ] Abstract:[Summary of RF-ranging as it exists in , and discussion of MAC extensions tosupport localization requirements for TVWS] Purpose:Support 4TV PHY proposals Notice:This document has been prepared to assist the IEEE 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

Doc.: IEEE m May 2012 Support for Ranging in TVWS (4TV) Features

Doc.: IEEE m May 2012 SubmissionSlide 3B. Rolfe (BCA) Network Topology supports almost any network topology – Star, peer-to-peer, cluster tree, … – asynchronous or synchronous Access : Centrally controlled Synchronous Access (TDM)

Doc.: IEEE m May 2012 SubmissionSlide 4B. Rolfe (BCA) Reference Model MAC Service Access Point (SAP) – MCPS : MAC Common Part Sublayer Data service – MLME : MAC Layer Management Entity service PHY Service Access Point (SAP) – PD: PHY Data service – PLME : PHY Layer Management Entity service

Doc.: IEEE m May 2012 SubmissionSlide 5B. Rolfe (BCA) Network Management MAC provides “tools” to build networks Few constraints on network topology – Star, Tree, Peer-to-peer, Mesh, Cluster tree, … Multiple access and transfer models – Asynchronous (non-beacon enabled) pure contention based – Semi-synchronous, superframe-based Supports contention and contention free access Multiple superframe structures (by now) – Time-synchronized (TSCH)

Doc.: IEEE m May 2012 SubmissionSlide 6B. Rolfe (BCA) Network Management Architectural Philosophy Network management is done at the network layer MAC provides “tool kit” of MAC mechanisms available to the higher layer Network Management Entity. External standards specify how the “tools” are used to build specific kinds of networks – ZigBee, ISA A, 6loWPAN, IEC 62591, IEC62734, … Many features available but not necessarily used

Doc.: IEEE m May 2012 SubmissionSlide 7B. Rolfe (BCA) Superframe Structures No superframe – Contention access only – No synchronous access structure Multiple superframe formats – Basic superframe – Extended superframes ( e-2012) – TSCH slot-frame structure ( e-2012) – LLDN Superframe ( e-2012)

Doc.: IEEE m May 2012 SubmissionSlide 8B. Rolfe (BCA) Superframe Structure DSME Multi-superframe: Expands superframe, more CFPs Basic Superframe: Contention and Contention Free access, supports sleepy devices with inactive periods e-2012

Doc.: IEEE m May 2012 SubmissionSlide 9B. Rolfe (BCA) e-2012 Superframe Structure LLDN Superframe : Synchronous access, STAR network TSCH Slotframe: Synchronous access (and hopping),

Doc.: IEEE m May 2012 SubmissionSlide 10B. Rolfe (BCA) Ranging in 15.4 Overview PHY support – UWB provides precision ranging Signal structure, bandwidth optimized for ToA measurement Defines timers for TX and RX time capture sub nansecond resolution. – Supports ranging on any data frame (initiated with MCPS-DATA request) – Can be used for round-trip time of flight, or single direction synchronous MAC support – Defines attributes for PHY configuration and control (MLME) – Provides for controlling ranging (enable/disable) on data exchange (MCPS) – Management services for channel sounding and preamble selection (MLM) – Supports single direction or two-way ranging – Provides local timestamps to higher layer – Exchange between peers higher layer function

Doc.: IEEE m May 2012 SubmissionSlide 11B. Rolfe (BCA) MAC services MLME MLME-RX-ENABLE – Added Parameter to enable Ranging measurement MLME-DPS.request – Controls preambles used for UWNB PHY ranging MLME-SOUNDING.request – Request PHY to return channel multi-path profile measurement – Algorithm not defined (implementation specific) MLME-CALIBRATE.request – Supports reporting internal delay offsets – Calibration method not defined (implementation specific)

Doc.: IEEE m May 2012 SubmissionSlide 12B. Rolfe (BCA) MAC Services MCPS MCPS-Data.Request parameters to control ranging MCPS-Data.Confirm parameters to pass ranging measurement information to the higher layer MCPS-Data.Indication includes parameters to pass ranging measurement information with received data frame

Doc.: IEEE m May 2012 SubmissionSlide 13B. Rolfe (BCA) MAC Frames Few frame types More flexible formats introduced in e-2012 – Enhances existing frames to allows addition of IEs – Multpi-purpose frame defined to provide extensibility

Doc.: IEEE m May 2012 SubmissionSlide 14B. Rolfe (BCA) MCPS Ranging Parameters

Doc.: IEEE m May 2012 SubmissionSlide 15B. Rolfe (BCA) MCPS Ranging Parameters

Doc.: IEEE m May 2012 SubmissionSlide 16B. Rolfe (BCA) Example MSC for Ranging Process

Doc.: IEEE m May 2012 SubmissionSlide 17B. Rolfe (BCA) Description Higher layer process controls process: – Determines peers that are ranging capable (RDEVs) – Initiates ranging – Collects local range measurements and exchanges range measurements with peers – Performs “solver” (local ranges to relative position to geo- position) Geo-calculations not defined in the standard, left to higher layer – May be centralized or distributed Exchange of data needed for calculations left to higher layer – No message formats defined in the MAC

Doc.: IEEE m May 2012 SubmissionSlide 18B. Rolfe (BCA) Description MAC provides – Primitives for performing ranging steps – Interface to PHY(s) ranging counters (ToF timers) – Supplies information to higher layer – Means to exchange data – *new in 4e* are mechanisms that support capabilities exchange, other advertisements in beacons – Hooks for initiating/managing internal calibration PHY provides – Ranging counters: Time-stamp to high precision TX and RX times – Support for channel sounding Supports ranging w/o global synchronization

Doc.: IEEE m May 2012 SubmissionSlide 19B. Rolfe (BCA) TG4m Considerations Channel access requires position knowledge – Exchange of position and position dependent data required for channel access has evolved since 2007 – MAC enhanced to include more superframe flexibility, more synchronous options, support for information exchange between MAC peers via IEs in beacons and other frames Transformation of range to position (solver) – Algorithms not interoperability concern – Defining data exchange can enhance interoperability

Doc.: IEEE m May 2012 SubmissionSlide 20B. Rolfe (BCA) Suggestions Build on MAC features – Some ranging hooks PHY agnostic (mostly) Define Information Elements to exchange range measurements – Use timer definitions in ? Much higher resolution than required – Provide several resolutions Precision in support of Less precises in support of TVWS at lower overhead – Leave position solver as higher layer function – Define rules for when localization is required Part of network forming?

Doc.: IEEE m May 2012 SubmissionSlide 21B. Rolfe (BCA) Information Exchange Raw range measurements – TX time of request (initiator) – RX time of request packet (responder) – TX time of response packet – Signal quality indication (Range FOM) Report exchanged between peers and ability for peers to relay neighbor reports – You need a collection of ranges in on place to solve for location

Doc.: IEEE m May 2012 SubmissionSlide 22B. Rolfe (BCA) Information Exchange Use IEs – Can be added to beacon (sync or async) – Can be added to other frames (data, MP, commands) New IEs for – Synchronization exchanges – measurement exchanges – Capabilities and setup – Define Location Reports Relative Position Geo-position

Doc.: IEEE m May 2012 SubmissionSlide 23B. Rolfe (BCA) Background Reference Annex E – Provides a good overview of RF ranging and localization