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802.15.4f TG
September 2009
Slide1
Project: IEEE P802.15 Working Group for Wireless Personal Area Networks (WPANs)Submission Title:[802.15.4f MAC Enhancement Discussion]Date Submitted:[24 September 2009]Source:[802.15.4f Task Group document, Mike McInnis submitter] Company [The Boeing Company]Address [P.O. Box 3707, MC 7M-CA, Seattle, Washington, USA 98124]E-Mail:[michael.d.mcinnis@boeing.com]Re:[]Abstract:[IEEE 802.15.4f MAC Enhancement Requirements Discussion]Purpose:[Work with the 802.15.4e TG on required 802.15.4f MAC enhancements in support of new 802.15.4f TG PHYs]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.
802.15.4f TG
September 2009
Slide2
Discussion of MAC Enhancements Recommended to Support RFID PHYs
Source: IEEE 802.15.4f TGSubmitter: Mike McInnis 802.15.4f Chair
802.15.4f TG
September 2009
Overview
This document presents three main modes of operation of an Active RFID systemStandard BlinkAddressed BlinkTwo WayIn each case we define, for the transmitted tag frameMinimum MAC Header requiredFrame usage criteriaIn any of these modes we may also enable Alternative Source IDsThe purpose is to provide sufficient information to stimulate the MAC enhancements discussion and make preliminary recommendationsAdditionally a location enabling, non-data postamble is described
Slide3
802.15.4f TG
September 2009
Standard Blink
In this mode tags transmit very short packets not directed to a particular PANA source ID is includedNo destination addressing or PAN ID is requiredMany RFID networks are single PANOmitting PAN IDSaves powerImproves throughput
Slide4
802.15.4f TG
September 2009
Standard Blink: MAC Header
Slide5
Octets:2
FrameControl
1
SequenceNumber
8
SourceAddress
variable
FramePayload
2
FCS
MAC Header: 13 octets + security header + payload
0/5/6/10/14
AuxiliarySecurityHeader
802.15.4f TG
September 2009
Standard Blink: Frame Usage
Aloha access (already defined in 15.4a)No association requiredNo ACK required
Slide6
802.15.4f TG
September 2009
Standard Blink: MAC Issues Identified
Is a new Blink Frame type required? Data Frame is an option, but how to stop non RFID devices processing as standard data?PAN ID (either source or destination) is mandatory in current standardSections 7.2.1.1.6 and 7.1.2.2.8How do we manage contamination of legacy 15.4 networks when we have no PAN ID?
Slide7
802.15.4f TG
September 2009
Addressed Blink
Same as Broadcast Blink, but includes a Destination PAN ID
Slide8
802.15.4f TG
September 2009
Addressed Blink: MAC Header
Slide9
Octets:2
FrameControl
1
SequenceNumber
MAC Header: 15 octets + security header + payload
2
DestinationPANIdentifier
8
SourceAddress
variable
FramePayload
2
FCS
0/5/6/10/14
AuxiliarySecurityHeader
802.15.4f TG
September 2009
Addressed Blink: Frame Usage
Aloha accessNo association requiredNo ACK requiredAbility to direct packets to a defined PAN
Slide10
802.15.4f TG
September 2009
Addressed Blink: MAC Issues Identified(In addition to Standard Blink issues)
Is it possible to assign PAN IDs by means other than a PAN Coordinator (e.g. application)?
Slide11
802.15.4f TG
September 2009
Two Way
Standard 15.4 operation with the addition of location awareness
Slide12
802.15.4f TG
September 2009
Two Way: MAC Header
Slide13
Octets:2
FrameControl
1
SequenceNumber
MAC Header: 15 octets + security header + payload
2
DestinationPANIdentifier
8
SourceAddress
variable
FramePayload
2
FCS
0/5/6/10/14
AuxiliarySecurityHeader
802.15.4f TG
September 2009
Two Way: Frame Usage
Access: variableAlohaGTSAssociation optionalACK optionalSecurity optional
Slide14
802.15.4f TG
September 2009
Two Way: MAC Issues Identified
No absolute value of RSSI is currently passed to the application layerCan a two way device operate without association?Can a network of FFDs operate with the same PAN ID and channel defined by the application layer?
Slide15
802.15.4f TG
September 2009
Alternative Source IDs
In some use cases, industry bodies beyond IEEE may assign tag (source) IDsAlternative IDs can be carried in payloadIn some cases where this occurs, there is a desire to omit the 64 bit source ID from the MAC HeaderFor the Blink Frame this means that the only addressing in the MAC Header is an optional Destination PAN ID
Slide16
802.15.4f TG
September 2009
TG4f Recommended Solution
New frame type for Blink frames (both Standard and Addressed)Distinct RFID frame which can be discarded by non RFID devices after Frame Control demodulation.Avoids contamination of legacy networksAllows for Source Address only operationAllows Source Address to be omitted when an alternate ID is in the payloadAllows both Source and Destination PAN ID to be omittedHas value beyond RFID applications
Slide17
802.15.4f TG
September 2009
Use of Data Frame for RFID
The only alternative to a new Blink frame type is to use a data frameBUT, this will only work if there is a designated “RFID” PAN IDThis is necessary to prevent other 15.4 devices from processing RFID packetsThis will NOT work with legacy devices which have freedom to assign any PAN ID
Slide18
802.15.4f TG
September 2009
Location Enabling Information (LEI) Postamble
RTLS RFID systems may require long LEI sequences for advanced location determinationA proposed LEI isOptional (on a frame by frame basis, specified in PHY header)Non data carryingLocated after the CRCThis is a PHY field outside the MAC – no MAC enhancements are required
Slide19
Preamble, SFD, PHR
MAC Header
FCS
LEI Postamble
Payload
802.15.4f TG
September 2009
Summary
The purpose of this document is toHighlight MAC enhancements required to enable RFID PHYsRecommend possible enhancementsHighlight PHY only extensions for informationTG4f welcomes discussion and recommendations from other 15.4 task groups
Slide20

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