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Copyright © 2005-2007 EPCglobal
®
, All Rights Reserved. Page 1 of 194
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Low Level Reader Protocol (LLRP), Version 1.0.1
Ratified Standard with Approved Fixed Errata
August 13, 2007
Disclaimer
EPCglobal Inc™ is providing this document as a service to interested industries.
This document was developed through a consensus process of interested
parties.
Although efforts have been to assure that the document is correct, reliable, and
technically accurate, EPCglobal Inc makes NO WARRANTY, EXPRESS OR
IMPLIED, THAT THIS DOCUMENT IS CORRECT, WILL NOT REQUIRE
MODIFICATION AS EXPERIENCE AND TECHNOLOGICAL ADVANCES
DICTATE, OR WILL BE SUITABLE FOR ANY
PURPOSE OR WORKABLE IN ANY APPLICATION, OR OTHERWISE. Use of
this document is with the understanding that EPCglobal Inc has no liability for
any claim to the contrary, or for any damage or loss of any kind or
nature.
Copyright notice 20
© 2006, 2007, EPCglobal Inc. 21
All rights reserved. Unauthorized reproduction, modification, and/or use of this document is not 22
permitted. Requests for permission to reproduce should be addressed to 23
epcglobal@epcglobalinc.org. 24
25
EPCglobal Inc.
TM
is providing this document as a service to interested industries. This 26
document was developed through a consensus process of interested parties. Although efforts 27
have been to assure that the document is correct, reliable, and technically accurate, EPCglobal 28
Inc. makes NO WARRANTY, EXPRESS OR IMPLIED, THAT THIS DOCUMENT IS 29
CORRECT, WILL NOT REQUIRE MODIFICATION AS EXPERIENCE AND TECHNOLOGICAL 30
ADVANCES DICTATE, OR WILL BE SUITABLE FOR ANY PURPOSE OR WORKABLE IN 31
ANY APPLICATION, OR OTHERWISE. Use of this Document is with the understanding that 32
EPCglobal Inc. has no liability for any claim to the contrary, or for any damage or loss of any 33
kind or nature 34
Copyright © 2005-2007 EPCglobal
®
, All Rights Reserved. Page 2 of 194
Abstract 35
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This document specifies an interface between RFID Readers and Clients. The interface
protocol is called low-level because it provides control of RFID air protocol operation
timing and access to air protocol command parameters. The design of this interface
recognizes that in some RFID systems, there is a requirement for explicit knowledge of
RFID air protocols and the ability to control Readers that implement RFID air protocol
communications. It also recognizes that coupling control to the physical layers of an
RFID infrastructure may be useful for the purpose of mitigating RFID interference.
Audience for this document
The target audience for this specification includes:
RFID Network Infrastructure vendors
Reader vendors
EPC Middleware vendors
System integrators
Status of this document
This section describes the status of this document at the time of its publication. Other
documents may supersede this document. The latest status of this document series is
maintained at EPCglobal. See www.epcglobalinc.org for more information.
This draft fixes errata in version 1.0 of LLRP that was ratified on April 12, 2007. A
summary of the fixed errata is contained in the table below. Note that Section and Line
numbers referenced are per version 1 of LLRP. Line numbers may be slightly different in
this version 1.0.1.
Comments on this document should be sent to the EPCglobal Software Action Group
Reader Operations Working Group mailing list at
sag_readerop@epclinklist.epcglobalinc.org. 59
60 Fixed Errata
Section# Line # Description Disposition
16.2.3.4.1 2921 It should be a generic UHF
RFModeTable Parameter (1-n)
with Notes under the parameter
that for C1G2 it is
UHFC1G2RFModeTable
Replace with UHF RFMode Table
Parameter (1-n)
15.2.1.3.1.1 2402 No length field Remove the length field from the
abstract
15.2.1.2.1.1.1 2309 No length field Remove the length field from the
abstract
9.2.1.1 1269 Range of Rx sensitivity 0-128 (relative to max sensitivity)
16.1.2 2593 C1G2LLRPCapabilities should be
replaced by
AirProtocolLLRPCapabilities
Parameter (0-1)
Replace with
AirProtocolLLRPCapabilties
Parameter (0-1)
9.2.4.1.2.1 1336 This is followed by a list of the
frequencies (in Khz) in hop table
order. The position of a frequency
in the list is its ChannelIndex.
(These are used by the hopping
event parameter)
This is followed by a list of the
frequencies (in Khz) in hop table
order. The one-based position of a
frequency in the list is its
ChannelIndex (i.e. the first
frequency is referred to as
ChannelIndex 1)
9.2.4.1.2.2 1343 This parameter carries the fixed
frequency list that can be used by
the Reader. The position of a
frequency in the list is its
ChannelIndex.
This parameter carries the fixed
frequency list that can be used by
the Reader. The one-based
position of a frequency in the list is
its ChannelIndex (i.e. the first
frequency is refered to as
ChannelIndex 1…)
12.2.6.2,
13.2.3.8,
13.2.6.2
1825,
2013,
2105
TheseChannelIndexes are used
by the RfTransmitter Parameter ,
Channel Index Parameter,
HoppingEventParameter
Possibly denote in these usages
that they are 1-based
11.1.3 1552 Delete access spec does not allow
0 like all other access spec
commands. This is believed to be
an errata
Possibly add zero to mean all
access specs, as in other access
spec commands.
16.2.7.1 3088 Custom parameter is 0-1. All
others are 0-N. This is believed to
be an errata
Extend this to 0-N to correct errata
16 2535,
2538
Encoding example:: message
length is 32 bits, but shown as 16
bits and 32-bit messageID is not
shown
Correct figures to match
documentation
14.2.2,
16.2.8.1
2215,
3270
The abstract
LLRPStatusParameter contains a
field called statusCode. The
binding references the same field
as ErrorCode
Correct binding section to match
abstract
16.4 3480 In 16.4, table 5,
"ReaderSensitivityTableEntry"
should be
ReceiveSensitivyTableElement
Change ReaderSensitivity to
ReceiveSensitivity
10.2.1,
16.2.4.1
1452,
2947
In 10.2.1, the field "Current State"
is listed as the last element of the
ROSpec Parameter, the binding
lists the same field as the 4th last
element.
Change position of "Current State"
field in abstract ROSpec
Parameter
16.4 3742 ReadEventNotification Change to
ReaderEventNotification
8.2 1194 Possible Values 0-255 Remove possible values.
Changed to unsigned integer
6.1 717 An AISpec binds a stop trigger and
a set of antennas to a set of
InventoryParameterSpecs and is
identified by a spec Identifier
Change the spec Identifyer to a
"one-based index called the
SpecIndex"
Copyright © 2005-2007 EPCglobal
®
, All Rights Reserved. Page 3 of 194
Copyright © 2005-2007 EPCglobal
®
, All Rights Reserved. Page 4 of 194
various various multiple instances of Khz Replace with kHz
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Copyright © 2005-2007 EPCglobal
®
, All Rights Reserved. Page 5 of 194
Contents 62
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INDEX OF FIGURES................................................................................................................................13
INDEX OF TABLES.................................................................................................................................. 14
1 (INFORMATIVE) GLOSSARY...................................................................................................... 15
2 INTRODUCTION............................................................................................................................. 18
3 ROLE WITHIN THE EPCGLOBAL NETWORK ARCHITECTURE...................................... 19
4 TERMINOLOGY AND TYPOGRAPHICAL CONVENTIONS................................................. 21
5 OVERVIEW OF LLRP.................................................................................................................... 21
5.1 TYPICAL LLRP TIMELINE .......................................................................................................... 22
6 LLRP OPERATION......................................................................................................................... 23
6.1 INVENTORY, RF SURVEY AND ACCESS OPERATIONS ................................................................. 23
6.1.1 Operation Triggers............................................................................................................... 32
6.1.1.1 Summary.................................................................................................................................... 32
6.1.1.2 Reader Operation Triggers......................................................................................................... 33
6.1.1.3 Access Operation Triggers......................................................................................................... 34
6.2 REPORTING, EVENT NOTIFICATION AND KEEPALIVES................................................................ 34
7 MESSAGES, PARAMETERS AND FIELDS................................................................................ 35
7.1 OVERVIEW ................................................................................................................................. 35
7.1.1 Formatting Conventions....................................................................................................... 35
7.1.2 Messages............................................................................................................................... 36
7.1.3 Parameters ........................................................................................................................... 37
7.1.3.1 General Parameters .................................................................................................................... 37
7.1.3.1.1 Timestamp............................................................................................................................ 37
7.1.3.1.1.1 UTCTimestamp Parameter............................................................................................. 37
7.1.3.1.1.2 Uptime Parameter........................................................................................................... 37
7.1.4 Fields.................................................................................................................................... 38
7.1.5 Functional Grouping............................................................................................................ 38
7.1.6 LLRP Messages and Actions ................................................................................................ 40
8 CUSTOM EXTENSION .................................................................................................................. 41
8.1 CUSTOM_MESSAGE.............................................................................................................. 42
8.2 CUSTOM PARAMETER................................................................................................................. 42
8.3 CUSTOM EXTENSION IN COMMANDS.......................................................................................... 42
8.4 CUSTOM EXTENSION IN INDIVIDUAL LLRP PARAMETERS ......................................................... 43
8.5 ALLOWABLE PARAMETER EXTENSION....................................................................................... 43
9 READER DEVICE CAPABILITIES.............................................................................................. 43
9.1 MESSAGES ................................................................................................................................. 44
9.1.1 GET_READER_CAPABILITIES .......................................................................................... 44
9.1.2 GET_READER_CAPABILITIES_RESPONSE ..................................................................... 44
9.2 PARAMETERS ............................................................................................................................. 45
9.2.1 GeneralDeviceCapabilities Parameter................................................................................. 45
9.2.1.1 ReceiveSensitivityTableEntry Parameter................................................................................... 45
9.2.1.2 PerAntennaReceiveSensitivityRange Parameter........................................................................ 46
9.2.1.3 PerAntennaAirProtocol Parameter............................................................................................. 46
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