SIST EN 303 681-2 V1.1.2:2020

ETSI EN 303 681-2 V1.1.2 (2020-06)






EUROPEAN STANDARD
Reconfigurable Radio Systems (RRS);
Radio Equipment (RE) information models and protocols
for generalized software reconfiguration architecture;
Part 2: generalized Reconfigurable
Radio Frequency Interface (gRRFI)

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2 ETSI EN 303 681-2 V1.1.2 (2020-06)



Reference
REN/RRS-0229
Keywords
interface, radio, SDR

ETSI
650 Route des Lucioles
F-06921 Sophia Antipolis Cedex - FRANCE

Tel.: +33 4 92 94 42 00  Fax: +33 4 93 65 47 16

Siret N° 348 623 562 00017 - NAF 742 C
Association à but non lucratif enregistrée à la
Sous-Préfecture de Grasse (06) N° 7803/88

Important notice
The present document can be downloaded from:
http://www.etsi.org/standards-search
The present document may be made available in electronic versions and/or in print. The content of any electronic and/or
print versions of the present document shall not be modified without the prior written authorization of ETSI. In case of any
existing or perceived difference in contents between such versions and/or in print, the prevailing version of an ETSI
deliverable is the one made publicly available in PDF format at www.etsi.org/deliver.
Users of the present document should be aware that the document may be subject to revision or change of status.
Information on the current status of this and other ETSI documents is available at
https://portal.etsi.org/TB/ETSIDeliverableStatus.aspx
If you find errors in the present document, please send your comment to one of the following services:
https://portal.etsi.org/People/CommiteeSupportStaff.aspx
Copyright Notification
No part may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying
and microfilm except as authorized by written permission of ETSI.
The content of the PDF version shall not be modified without the written authorization of ETSI.
The copyright and the foregoing restriction extend to reproduction in all media.

© ETSI 2020.
All rights reserved.

DECT™, PLUGTESTS™, UMTS™ and the ETSI logo are trademarks of ETSI registered for the benefit of its Members.

3GPP™ and LTE™ are trademarks of ETSI registered for the benefit of its Members and
of the 3GPP Organizational Partners.
oneM2M™ logo is a trademark of ETSI registered for the benefit of its Members and
of the oneM2M Partners.
®
GSM and the GSM logo are trademarks registered and owned by the GSM Association.
ETSI

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3 ETSI EN 303 681-2 V1.1.2 (2020-06)
Contents
Intellectual Property Rights . 4
Foreword . 4
Modal verbs terminology . 4
1 Scope . 5
2 References . 5
2.1 Normative references . 5
2.2 Informative references . 5
3 Definition of terms, symbols and abbreviations . 6
3.1 Terms . 6
3.2 Symbols . 8
3.3 Abbreviations . 8
4 Introduction . 8
5 System Identification . 10
5.1 Radio Computer Structure . 10
5.2 URA . 12
5.3 RF Transceiver . 12
5.4 RF Interfaces . 12
5.5 Radio Computer RF System Requirement Mapping . 12
6 Notational Tools . 13
6.1 Notational Tool for Information Model Classes . 13
6.2 Notational Tool for Interface Classes . 13
7 Information Model for Radio Computer . 13
7.1 Radio Computer . 13
7.2 Class Definitions for Information Model . 16
8 Interface Definition . 21
8.1 Interface Overview . 21
8.2 Spectrum Control Services . 24
8.2.1 Overview on Spectrum Control Services . 24
8.2.2 Messages for Spectrum Control Services . 24
8.3 Power Control Services . 25
8.3.1 Overview on Power Control Services . 25
8.3.2 Messages for Power Control Services . 25
8.4 Antenna Management Services . 25
8.4.1 Overview on Antenna Management Services . 25
8.4.2 Messages for Antenna Management Services. 26
8.5 Tx/Rx Chain Control Services. 26
8.5.1 Overview on Tx/Rx Chain Control Services . 26
8.5.2 Messages for Tx/Rx Chain Control Services . 26
8.6 RVM Protection Services . 27
8.6.1 Overview on RVM Protection Services . 27
8.6.2 Messages for RVM Protection Services . 28
8.7 Class Definitions for Interface . 28
Annex A (informative): Abstract Data Definitions . 31
Annex B (informative): gRRFI Qualification Methods for Validation . 35
History . 36

ETSI

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4 ETSI EN 303 681-2 V1.1.2 (2020-06)
Intellectual Property Rights
Essential patents
IPRs essential or potentially essential to normative deliverables may have been declared to ETSI. The information
pertaining to these essential IPRs, if any, is publicly available for ETSI members and non-members, and can be found
in ETSI SR 000 314: "Intellectual Property Rights (IPRs); Essential, or potentially Essential, IPRs notified to ETSI in
respect of ETSI standards", which is available from the ETSI Secretariat. Latest updates are available on the ETSI Web
server (https://ipr.etsi.org/).
Pursuant to the ETSI IPR Policy, no investigation, including IPR searches, has been carried out by ETSI. No guarantee
can be given as to the existence of other IPRs not referenced in ETSI SR 000 314 (or the updates on the ETSI Web
server) which are, or may be, or may become, essential to the present document.
Trademarks
The present document may include trademarks and/or tradenames which are asserted and/or registered by their owners.
ETSI claims no ownership of these except for any which are indicated as being the property of ETSI, and conveys no
right to use or reproduce any trademark and/or tradename. Mention of those trademarks in the present document does
not constitute an endorsement by ETSI of products, services or organizations associated with those trademarks.
Foreword
This European Standard (EN) has been produced by ETSI Technical Committee Reconfigurable Radio Systems (RRS).
The present document is part 2 of a multi-part deliverable covering the Radio Equipment (RE) information models and
protocols, as identified below:
Part 1: "generalized Multiradio Interface (gMURI)";
Part 2: "generalized Reconfigurable Radio Frequency Interface (gRRFI)";
Part 3: "generalized Unified Radio Application Interface (gURAI)";
Part 4: "generalized Radio Programming Interface (gRPI)".

National transposition dates
Date of adoption of this EN: 22 June 2020
Date of latest announcement of this EN (doa): 30 September 2020
Date of latest publication of new National Standard
or endorsement of this EN (dop/e): 31 March 2021
Date of withdrawal of any conflicting National Standard (dow): 31 March 2021

Modal verbs terminology
In the present document "shall", "shall not", "should", "should not", "may", "need not", "will", "will not", "can" and
"cannot" are to be interpreted as described in clause 3.2 of the ETSI Drafting Rules (Verbal forms for the expression of
provisions).
"must" and "must not" are NOT allowed in ETSI deliverables except when used in direct citation.
ETSI

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5 ETSI EN 303 681-2 V1.1.2 (2020-06)
1 Scope
The present document defines an information model and protocol for generalized reconfigurable radio frequency
interface for reconfigurable REs except for reconfigurable mobile devices which are covered in [i.7] to [i.12]. The work
is based on the Use Cases defined in ETSI TR 103 585 [i.1], on the system requirements defined in ETSI
EN 303 641 [1] and on the radio reconfiguration related architecture for reconfigurable RE defined in ETSI
EN 303 648 [i.2].
The present document will be based on ETSI EN 303 146-2 [i.10] and provide a generalized interface definition for the
generalized Reconfigurable Radio Frequency Interface.
2 References
2.1 Normative references
References are either specific (identified by date of publication and/or edition number or version number) or
non-specific. For specific references, only the cited version applies. For non-specific references, the latest version of the
referenced document (including any amendments) applies.
Referenced documents which are not found to be publicly available in the expected location might be found at
https://docbox.etsi.org/Reference/.
NOTE: While any hyperlinks included in this clause were valid at the time of publication, ETSI cannot guarantee
their long term validity.
The following referenced documents are necessary for the application of the present document.
[1] ETSI EN 303 641: "Reconfigurable Radio Systems (RRS); Radio Equipment (RE) reconfiguration
requirements".
2.2 Informative references
References are either specific (identified by date of publication and/or edition number or version number) or
non-specific. For specific references, only the cited version applies. For non-specific references, the latest version of the
referenced document (including any amendments) applies.
NOTE: While any hyperlinks included in this clause were valid at the time of publication, ETSI cannot guarantee
their long term validity.
The following referenced documents are not necessary for the application of the present document but they assist the
user with regard to a particular subject area.
[i.1] ETSI TR 103 585: "Reconfigurable Radio Systems (RRS); Radio Equipment (RE) reconfiguration
use cases".
[i.2] ETSI EN 303 648: "Reconfigurable Radio Systems (RRS); Radio Equipment (RE) reconfiguration
architecture".
[i.3] IEEE 1900.4™-2009: "IEEE Standard for Architectural Building Blocks Enabling Network-
Device Distributed Decision Making for Optimized Radio Resource Usage in Heterogeneous
Wireless Access Networks".
®
[i.4] DigRFSM Working Group: "MIPI Alliance Specification for DigRFSM v4".
[i.5] Recommendation ITU-T X.680: "Information technology - Abstract Syntax Notation One
(ASN.1): Specification of basic notation".
[i.6] Directive 2014/53/EU of the European Parliament and of the Council of 16 April 2014 on the
harmonisation of the laws of the Member States relating to the making available on the market of
Radio Equipment and repealing Directive 1999/5/EC.
ETSI

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6 ETSI EN 303 681-2 V1.1.2 (2020-06)
[i.7] ETSI EN 302 969: "Reconfigurable Radio Systems (RRS); Radio Reconfiguration related
Requirements for Mobile Devices".
[i.8] ETSI EN 303 095: "Reconfigurable Radio Systems (RRS); Radio reconfiguration related
architecture for Mobile Devices (MD)".
[i.9] ETSI EN 303 146-1: "Reconfigurable Radio Systems (RRS); Mobile Device (MD) information
models and protocols; Part 1: Multiradio Interface (MURI)".
[i.10] ETSI EN 303 146-2: "Reconfigurable Radio Systems (RRS); Mobile Device (MD) information
models and protocols; Part 2: Reconfigurable Radio Frequency Interface (RRFI)".
[i.11] ETSI EN 303 146-3: "Reconfigurable Radio Systems (RRS); Mobile Device (MD) information
models and protocols; Part 3: Unified Radio Application Interface (URAI)".
[i.12] ETSI EN 303 146-4: "Reconfigurable Radio Systems (RRS); Mobile Device (MD) information
models and protocols; Part 4: Radio Programming Interface (RPI)".
[i.13] ETSI EN 303 681-1: "Reconfigurable Radio Systems (RRS); Radio Equipment (RE) information
models and protocols for generalized software reconfiguration architecture; Part 1: generalized
Multiradio Interface (gMURI)".
[i.14] ETSI EN 303 681-3: "Reconfigurable Radio Systems (RRS); Radio Equipment (RE) information
models and protocols for generalized software reconfiguration architecture; Part 3: generalized
Unified Radio Application Interface (gURAI)".
[i.15] ETSI EN 303 681-4: "Reconfigurable Radio Systems (RRS); adio Equipment (RE) information
models and protocols for generalized software reconfiguration architecture; Part 4: generalized
Radio Programming Interface (gRPI)".
3 Definition of terms, symbols and abbreviations
3.1 Terms
For the purposes of the present document, the following terms apply:
association: logical communication link to a Radio Access Network or a peer equipment
NOTE 1: Typically, some control signalling is necessary to maintain the association. No user data transfer may
occur with only an association present, but a data flow may be established into an association for this
purpose.
NOTE 2: Peer equipment is any communication counterpart of a reconfigurable Radio Equipment. It can be
reached by establishing a logical communication link (i.e. an association) between the reconfigurable
Radio Equipment and peer equipment.
channel: designated part of the information transfer capability having specified characteristics, provided at the user
network interface
NOTE: It is the over-the-air wireless propagation channel which is used to convey an information signal from
transmitter to receiver. This definition is specified in ETSI EN 303 648 [i.2].
Communication Services Layer (CSL): layer related to communication services supporting generic applications
NOTE: A communication services layer supports generic applications like Internet access. In the present
document, it consists of Administrator, Mobility Policy Manager (MPM), Networking stack and Monitor.
link: connection from one location to another through a given Radio Access Technology for the purpose of transmitting
and receiving digital information
NOTE: Each Link is conveyed over a given Channel.
ETSI

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7 ETSI EN 303 681-2 V1.1.2 (2020-06)
Radio Application (RA): software which enforces the generation of the transmit RF signals or the decoding of the
receive RF signals
NOTE 1: The software is executed on a particular radio platform or an RVM as part of the radio platform.
NOTE 2: RAs might have different forms of representation. They are represented as:
 source codes including Radio Library calls of Radio Library native implementation and Radio HAL
calls;
 IRs including Radio Library calls of Radio Library native implementation and radio HAL calls;
 executable codes for a particular radio platform.
Radio Computer (RC): part of Radio Equipment working under ROS control and on which RAs are executed
NOTE: A Radio Computer typically includes programmable processors, hardware accelerators, peripherals,
software, etc. RF part is considered to be part of peripherals.
Radio Control Framework (RCF): control framework which, as a part of the OS, extends OS capabilities in terms of
radio resource management
NOTE: RCF is a control framework which consists of Configuration Manager (CM), Radio Connection Manager
(RCM), Flow Controller (FC), Multiradio Controller (MRC) and Resource Manager (RM) which is
typically part of OS.
Radio Equipment (RE): "an electrical or electronic product, which intentionally emits and/or receives radio waves for
the purpose of radio communication and/or radiodetermination, or an electrical or electronic product which must be
completed with an accessory, such as antenna, so as to intentionally emit and/or receive radio waves for the purpose of
radio communication and/or radiodetermination".
NOTE: The definition above is as defined in the Radio Equipment Directive, Article 2(1)(1) [i.6].
Radio Frequency (RF) transceiver: part of radio platform converting, for transmission, baseband signals into radio
signals, and, for reception, radio signals into baseband signals
Radio Operating System (ROS): any appropriate OS empowered by RCF
NOTE: ROS provides RCF capabilities as well as traditional management capabilities related to management of
radio platform such as resource management, file system support, unified access to hardware resources,
etc.
radio platform: part of radio equipment hardware which relates to radio processing capability, including
programmable components, hardware accelerators, RF transceiver, and antenna(s)
NOTE: A Radio Platform is a piece of hardware capable of generating RF signals or receiving RF signals. By
nature, it is heterogeneous hardware including different processing elements such as fixed accelerators,
e.g. Application-Specific Integrated Circuit (ASIC), or reconfigurable accelerators, e.g. FPGAs, etc.
Radio Virtual Machine (RVM): abstract machine which supports reactive and concurrent executions
NOTE: An RVM may be implemented as a controlled execution environment which allows the selection of a
trade-off between flexibility of base band code development and required (re-)certification efforts.
reconfigurable mobile device: mobile device with radio communication capabilities providing support for radio
reconfiguration
NOTE: Reconfigurable mobile devices include but are not limited to: smartphones, feature phones, tablets, and
laptops.
reconfigurable Radio Equipment: Radio Equipment with radio communication capabilities providing support for
radio reconfiguration
NOTE: Reconfigurable Radio Equipment includes Smartphones, Feature phones, Tablets, Laptops, Connected
Vehicle communication platform, Network platform, IoT device, etc.
ETSI

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8 ETSI EN 303 681-2 V1.1.2 (2020-06)
3.2 Symbols
Void.
3.3 Abbreviations
For the purposes of the present document, the following abbreviations apply:
ACK ACKnowledgement
ACKM ACKnowledgement with Modification
AP Application Processor
ASIC Application-Specific Integrated Circuit
ASN.1 Abstract Syntax Notation One
BBIC Base-Band Integrated Circuit
BLER Block Error Rate
CSL Communication Services Layer
EU European Union
gMURI generalized Multiradio Interface
gRPI generalized Radio Programming Interface
gRRFI generalized Reconfigurable Radio Frequency Interface
gURAI generalized Unified Radio Applications Interface
MIMO Multiple Input Multiple Output
MPM Mobility Policy Manager
NACK Negative ACKnowledgement
OOB Out Of Band
OS Operating System
RA Radio Application
RAN Radio Access Network
RAP Radio Application Package
RAT Radio Access Technology
RC Radio Computer
RCF Radio Control Framework
RCID Radio Computer Identification
RE Radio Equipment
RERC Radio Equipment Reconfiguration Class
RF Radio Frequency
RFIC Radio Frequency Integrated Circuit
ROS Radio Operating System
RRFI Reconfigurable Radio Frequency Interface
RVM Radio Virtual Machine
RX Reception
SINR Signal to Interference plus Noise Ratio
TR Technical Report
UML Unified Modeling Language
URA Unified Radio Applications
4 Introduction
A reconfigurable RE is capable of running multiple radios simultaneously, changing the set of radios by loading new
Radio Application Packages (RAP) and setting their parameters. All Radio Applications (RAs) are called Unified Radio
Applications (URAs) when they exhibit a common behaviour from the reconfigurable RE's point of view in ETSI
EN 303 648 [i.2]. In order to run multiple URAs, the reconfigurable RE will include Communication Services Layer
(CSL), Radio Control Frameworks (RCFs), Radio Platforms and 4 sets of interfaces for their interconnection.
ETSI

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9 ETSI EN 303 681-2 V1.1.2 (2020-06)

Figure 4.1: Four sets of interfaces for reconfigurable RE
Figure 4.1 illustrates the reconfigurable RE architecture with the 4 sets of interfaces, i.e.:
• gMURI for interfacing CSL and RCF (in ETSI EN 303 681-1 [i.13]).
• gRRFI for interfacing URA and RF Transceiver, which is the scope of the present document.
• gURAI for interfacing URA and RCF (in ETSI EN 303 681-3 [i.14]).
• gRPI for allowing an independent and uniform production of RAs (in ETSI EN 303 681-4 [i.15]).
The present document defines gRRFI.
ETSI

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10 ETSI EN 303 681-2 V1.1.2 (2020-06)
<< in t e rf a ce >>
IgM U R I
<< in t e rf a ce >>
IgRRF I
RadioComputer
<< in t e rf a ce >>
IgU R AI
<< in t e rf a ce>>
IgR PI

Figure 4.2: UML class diagram for RC interfaces
Figure 4.2 illustrates UML class diagram for RC interfaces. The reconfigurable RE may be seen as RCs where
individual URAs are engineered as software entities in ETSI EN 303 648 [i.2].
The present document is organized as follows:
• clause 5 describes the system identification;
• clause 6 describes the notational tool for defining both information model classes and interface classes;
• clause 7 describes the information model for RC; and
• clause 8 describes the interface definition.
While UML is used for defining the information model and protocol related to gRRFI, other modelling languages could
be used as well.
5 System Identification
5.1 Radio Computer Structure
Figure 5.1 illustrates how URA and RF Transceiver interacts with each other using gRRFI.
ETSI

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11 ETSI EN 303 681-2 V1.1.2 (2020-06)

Figure 5.1: Interconnection between URA and RF Transceiver
using gRRFI for reconfigurable RE
As shown in figure 5.1, gRRFI can support up to 5 kinds of services depending on the applicable RERC [1].
A Reconfigurable RE shall support all the services as required by the corresponding RERC as shown in table 5.1 and
fully detailed in clause 8 of the present document. In case that a reconfigurable RE supports multiple RERCs, the
concerned reconfigurable RE shall support all the services as defined in table 5.1.
Table 5.1: Required services of gRRFI according to each RERC
Radio Equipment Antenna
Spectrum Power Control Tx/Rx Chain RVM Protection
Reconfiguration Management
Control services services Control services services
Class services
RERC-0 No No No No No
RERC-1 Yes Yes No No Yes
Yes
RERC-2, RERC-5 Yes Yes Yes Yes
(see note)
RERC-3, RERC-6 Yes Yes Yes Yes Yes
RERC-4, RERC-7 Yes Yes Yes Yes Yes
NOTE: Among the various Tx/Rx Chain Control services, only the service related with Tx/Rx timing is required in this
case.

A corresponding summary of the services is given below:
• Spectrum Control services
- These services are used to set up spectrum-related parameters such as carrier frequency, bandwidth,
sampling frequency, etc. that will be determined according to the URAs they are related to.
• Power Control services
- These services are used to set up RF power-related parameters such as maximum transmit (Tx) power
level, Tx power level per antenna, receive (Rx) gain, etc. Specific power schemes which have to be
controlled according to the communication circumstance around the reconfigurable RE are also included
in the Power Control services.
• Antenna Management services
- These services are used to determine the antenna configuration. Antenna radiation pattern, antenna gain,
antenna direction, sector configuration, polarization, frequency range, etc. are some factors to be
considered in the Antenna Management services.
NOTE: Antenna Management services depend on the configurability of the antenna.
ETSI

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12 ETSI EN 303 681-2 V1.1.2 (2020-06)
• Tx/Rx Chain Control services
- These services are used to provide parameters related to real-time control of the RF transceiver chain.
Parameters to be controlled using the Tx/Rx Chain Control services include (but are not limited to) Tx
start/stop time, Rx start/stop time, spectrum- and/or power-related values.
• RVM Protection services
- These services are used to provide parameters related to the selection of RVM protection class.
Parameters to be controlled using the RVM Protection services include (but are not limited to) selection
and/or request of RF protection class as well as, RF Front-end indication of input data signals
modification.
The clauses 5.2 to 5.4 describe the components/entities shown in figure 5.1.
5.2 URA
RAs need to be subject to a common reconfiguration, multiradio execution and resource sharing strategy framework
(depending on the concerned RERC). Since all RAs exhibit a common behaviour from the reconfigurable RE
perspective, those RAs are called URAs [i.8].
5.3 RF Transceiver
RF Transceiver, which includes transceiver chain(s), is part of the radio platform in RC that transforms, in Tx mode, the
baseband signal to radio signal, and in Rx mode, the radio signal to baseband signal.
5.4 RF Interfaces
The RF Interfaces depicted in figure 5.1 denote digital interfaces which define the physical interconnections between
SM
base-band and RFIC (Radio Frequency Integrated Circuit), for example, the DigRF specification defining the
interface between an RFIC and a BBIC (Base-Band Integrated Circuit) in a radio equipment. gRRFI defined in the
present document complements such RF interfaces by defining services which are re
...

Draft ETSI EN 303 681-2 V1.1.2 (2020-03)






EUROPEAN STANDARD
Reconfigurable Radio Systems (RRS);
Radio Equipment (RE) information models and protocols
for generalized software reconfiguration architecture;
Part 2: generalized Reconfigurable
Radio Frequency Interface (gRRFI)

---------------------- Page: 1 ----------------------
2 Draft ETSI EN 303 681-2 V1.1.2 (2020-03)



Reference
REN/RRS-0229
Keywords
interface, radio, SDR

ETSI
650 Route des Lucioles
F-06921 Sophia Antipolis Cedex - FRANCE

Tel.: +33 4 92 94 42 00  Fax: +33 4 93 65 47 16

Siret N° 348 623 562 00017 - NAF 742 C
Association à but non lucratif enregistrée à la
Sous-Préfecture de Grasse (06) N° 7803/88

Important notice
The present document can be downloaded from:
http://www.etsi.org/standards-search
The present document may be made available in electronic versions and/or in print. The content of any electronic and/or
print versions of the present document shall not be modified without the prior written authorization of ETSI. In case of any
existing or perceived difference in contents between such versions and/or in print, the prevailing version of an ETSI
deliverable is the one made publicly available in PDF format at www.etsi.org/deliver.
Users of the present document should be aware that the document may be subject to revision or change of status.
Information on the current status of this and other ETSI documents is available at
https://portal.etsi.org/TB/ETSIDeliverableStatus.aspx
If you find errors in the present document, please send your comment to one of the following services:
https://portal.etsi.org/People/CommiteeSupportStaff.aspx
Copyright Notification
No part may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying
and microfilm except as authorized by written permission of ETSI.
The content of the PDF version shall not be modified without the written authorization of ETSI.
The copyright and the foregoing restriction extend to reproduction in all media.

© ETSI 2020.
All rights reserved.

DECT™, PLUGTESTS™, UMTS™ and the ETSI logo are trademarks of ETSI registered for the benefit of its Members.

3GPP™ and LTE™ are trademarks of ETSI registered for the benefit of its Members and
of the 3GPP Organizational Partners.
oneM2M™ logo is a trademark of ETSI registered for the benefit of its Members and
of the oneM2M Partners.
®
GSM and the GSM logo are trademarks registered and owned by the GSM Association.
ETSI

---------------------- Page: 2 ----------------------
3 Draft ETSI EN 303 681-2 V1.1.2 (2020-03)
Contents
Intellectual Property Rights . 4
Foreword . 4
Modal verbs terminology . 4
1 Scope . 5
2 References . 5
2.1 Normative references . 5
2.2 Informative references . 5
3 Definition of terms, symbols and abbreviations . 6
3.1 Terms . 6
3.2 Symbols . 8
3.3 Abbreviations . 8
4 Introduction . 8
5 System Identification . 10
5.1 Radio Computer Structure . 10
5.2 URA . 12
5.3 RF Transceiver . 12
5.4 RF Interfaces . 12
5.5 Radio Computer RF System Requirement Mapping . 12
6 Notational Tools . 13
6.1 Notational Tool for Information Model Classes . 13
6.2 Notational Tool for Interface Classes . 13
7 Information Model for Radio Computer . 13
7.1 Radio Computer . 13
7.2 Class Definitions for Information Model . 16
8 Interface Definition . 21
8.1 Interface Overview . 21
8.2 Spectrum Control Services . 24
8.2.1 Overview on Spectrum Control Services . 24
8.2.2 Messages for Spectrum Control Services . 24
8.3 Power Control Services . 25
8.3.1 Overview on Power Control Services . 25
8.3.2 Messages for Power Control Services . 25
8.4 Antenna Management Services . 25
8.4.1 Overview on Antenna Management Services . 25
8.4.2 Messages for Antenna Management Services. 26
8.5 Tx/Rx Chain Control Services. 26
8.5.1 Overview on Tx/Rx Chain Control Services . 26
8.5.2 Messages for Tx/Rx Chain Control Services . 26
8.6 RVM Protection Services . 27
8.6.1 Overview on RVM Protection Services . 27
8.6.2 Messages for RVM Protection Services . 28
8.7 Class Definitions for Interface . 28
Annex A (informative): Abstract Data Definitions . 31
Annex B (informative): gRRFI Qualification Methods for Validation . 35
History . 36

ETSI

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4 Draft ETSI EN 303 681-2 V1.1.2 (2020-03)
Intellectual Property Rights
Essential patents
IPRs essential or potentially essential to normative deliverables may have been declared to ETSI. The information
pertaining to these essential IPRs, if any, is publicly available for ETSI members and non-members, and can be found
in ETSI SR 000 314: "Intellectual Property Rights (IPRs); Essential, or potentially Essential, IPRs notified to ETSI in
respect of ETSI standards", which is available from the ETSI Secretariat. Latest updates are available on the ETSI Web
server (https://ipr.etsi.org/).
Pursuant to the ETSI IPR Policy, no investigation, including IPR searches, has been carried out by ETSI. No guarantee
can be given as to the existence of other IPRs not referenced in ETSI SR 000 314 (or the updates on the ETSI Web
server) which are, or may be, or may become, essential to the present document.
Trademarks
The present document may include trademarks and/or tradenames which are asserted and/or registered by their owners.
ETSI claims no ownership of these except for any which are indicated as being the property of ETSI, and conveys no
right to use or reproduce any trademark and/or tradename. Mention of those trademarks in the present document does
not constitute an endorsement by ETSI of products, services or organizations associated with those trademarks.
Foreword
This draft European Standard (EN) has been produced by ETSI Technical Committee Reconfigurable Radio Systems
(RRS), and is now submitted for the combined Public Enquiry and Vote phase of the ETSI standards EN Approval
Procedure.
The present document is part 2 of a multi-part deliverable covering the Radio Equipment (RE) information models and
protocols, as identified below:
Part 1: "generalized Multiradio Interface (gMURI)";
Part 2: "generalized Reconfigurable Radio Frequency Interface (gRRFI)";
Part 3: "generalized Unified Radio Application Interface (gURAI)";
Part 4: "generalized Radio Programming Interface (gRPI)".

Proposed national transposition dates
Date of latest announcement of this EN (doa): 3 months after ETSI publication
Date of latest publication of new National Standard
or endorsement of this EN (dop/e): 6 months after doa
Date of withdrawal of any conflicting National Standard (dow): 6 months after doa

Modal verbs terminology
In the present document "shall", "shall not", "should", "should not", "may", "need not", "will", "will not", "can" and
"cannot" are to be interpreted as described in clause 3.2 of the ETSI Drafting Rules (Verbal forms for the expression of
provisions).
"must" and "must not" are NOT allowed in ETSI deliverables except when used in direct citation.
ETSI

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5 Draft ETSI EN 303 681-2 V1.1.2 (2020-03)
1 Scope
The present document defines an information model and protocol for generalized reconfigurable radio frequency
interface for reconfigurable REs except for reconfigurable mobile devices which are covered in [i.7] to [i.12]. The work
is based on the Use Cases defined in ETSI TR 103 585 [i.1], on the system requirements defined in ETSI
EN 303 641 [1] and on the radio reconfiguration related architecture for reconfigurable RE defined in ETSI
EN 303 648 [i.2].
The present document will be based on ETSI EN 303 146-2 [i.10] and provide a generalized interface definition for the
generalized Reconfigurable Radio Frequency Interface.
2 References
2.1 Normative references
References are either specific (identified by date of publication and/or edition number or version number) or
non-specific. For specific references, only the cited version applies. For non-specific references, the latest version of the
referenced document (including any amendments) applies.
Referenced documents which are not found to be publicly available in the expected location might be found at
https://docbox.etsi.org/Reference/.
NOTE: While any hyperlinks included in this clause were valid at the time of publication, ETSI cannot guarantee
their long term validity.
The following referenced documents are necessary for the application of the present document.
[1] ETSI EN 303 641: "Reconfigurable Radio Systems (RRS); Radio Equipment (RE) reconfiguration
requirements".
2.2 Informative references
References are either specific (identified by date of publication and/or edition number or version number) or
non-specific. For specific references, only the cited version applies. For non-specific references, the latest version of the
referenced document (including any amendments) applies.
NOTE: While any hyperlinks included in this clause were valid at the time of publication, ETSI cannot guarantee
their long term validity.
The following referenced documents are not necessary for the application of the present document but they assist the
user with regard to a particular subject area.
[i.1] ETSI TR 103 585: "Reconfigurable Radio Systems (RRS); Radio Equipment (RE) reconfiguration
use cases".
[i.2] ETSI EN 303 648: "Reconfigurable Radio Systems (RRS); Radio Equipment (RE) reconfiguration
architecture".
[i.3] IEEE 1900.4™-2009: "IEEE Standard for Architectural Building Blocks Enabling Network-
Device Distributed Decision Making for Optimized Radio Resource Usage in Heterogeneous
Wireless Access Networks".
®
[i.4] DigRFSM Working Group: "MIPI Alliance Specification for DigRFSM v4".
[i.5] Recommendation ITU-T X.680: "Information technology - Abstract Syntax Notation One
(ASN.1): Specification of basic notation".
[i.6] Directive 2014/53/EU of the European Parliament and of the Council of 16 April 2014 on the
harmonisation of the laws of the Member States relating to the making available on the market of
Radio Equipment and repealing Directive 1999/5/EC.
ETSI

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6 Draft ETSI EN 303 681-2 V1.1.2 (2020-03)
[i.7] ETSI EN 302 969: "Reconfigurable Radio Systems (RRS); Radio Reconfiguration related
Requirements for Mobile Devices".
[i.8] ETSI EN 303 095: "Reconfigurable Radio Systems (RRS); Radio reconfiguration related
architecture for Mobile Devices (MD)".
[i.9] ETSI EN 303 146-1: "Reconfigurable Radio Systems (RRS); Mobile Device (MD) information
models and protocols; Part 1: Multiradio Interface (MURI)".
[i.10] ETSI EN 303 146-2: "Reconfigurable Radio Systems (RRS); Mobile Device (MD) information
models and protocols; Part 2: Reconfigurable Radio Frequency Interface (RRFI)".
[i.11] ETSI EN 303 146-3: "Reconfigurable Radio Systems (RRS); Mobile Device (MD) information
models and protocols; Part 3: Unified Radio Application Interface (URAI)".
[i.12] ETSI EN 303 146-4: "Reconfigurable Radio Systems (RRS); Mobile Device (MD) information
models and protocols; Part 4: Radio Programming Interface (RPI)".
[i.13] ETSI EN 303 681-1: "Reconfigurable Radio Systems (RRS); Radio Equipment (RE) information
models and protocols for generalized software reconfiguration architecture; Part 1: generalized
Multiradio Interface (gMURI)".
[i.14] ETSI EN 303 681-3: "Reconfigurable Radio Systems (RRS); Radio Equipment (RE) information
models and protocols for generalized software reconfiguration architecture; Part 3: generalized
Unified Radio Application Interface (gURAI)".
[i.15] ETSI EN 303 681-4: "Reconfigurable Radio Systems (RRS); adio Equipment (RE) information
models and protocols for generalized software reconfiguration architecture; Part 4: generalized
Radio Programming Interface (gRPI)".
3 Definition of terms, symbols and abbreviations
3.1 Terms
For the purposes of the present document, the following terms apply:
association: logical communication link to a Radio Access Network or a peer equipment
NOTE 1: Typically, some control signalling is necessary to maintain the association. No user data transfer may
occur with only an association present, but a data flow may be established into an association for this
purpose.
NOTE 2: Peer equipment is any communication counterpart of a reconfigurable Radio Equipment. It can be
reached by establishing a logical communication link (i.e. an association) between the reconfigurable
Radio Equipment and peer equipment.
channel: designated part of the information transfer capability having specified characteristics, provided at the user
network interface
NOTE: It is the over-the-air wireless propagation channel which is used to convey an information signal from
transmitter to receiver. This definition is specified in ETSI EN 303 648 [i.2].
Communication Services Layer (CSL): layer related to communication services supporting generic applications
NOTE: A communication services layer supports generic applications like Internet access. In the present
document, it consists of Administrator, Mobility Policy Manager (MPM), Networking stack and Monitor.
link: connection from one location to another through a given Radio Access Technology for the purpose of transmitting
and receiving digital information
NOTE: Each Link is conveyed over a given Channel.
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7 Draft ETSI EN 303 681-2 V1.1.2 (2020-03)
Radio Application (RA): software which enforces the generation of the transmit RF signals or the decoding of the
receive RF signals
NOTE 1: The software is executed on a particular radio platform or an RVM as part of the radio platform.
NOTE 2: RAs might have different forms of representation. They are represented as:
 source codes including Radio Library calls of Radio Library native implementation and Radio HAL
calls;
 IRs including Radio Library calls of Radio Library native implementation and radio HAL calls;
 executable codes for a particular radio platform.
Radio Computer (RC): part of Radio Equipment working under ROS control and on which RAs are executed
NOTE: A Radio Computer typically includes programmable processors, hardware accelerators, peripherals,
software, etc. RF part is considered to be part of peripherals.
Radio Control Framework (RCF): control framework which, as a part of the OS, extends OS capabilities in terms of
radio resource management
NOTE: RCF is a control framework which consists of Configuration Manager (CM), Radio Connection Manager
(RCM), Flow Controller (FC), Multiradio Controller (MRC) and Resource Manager (RM) which is
typically part of OS.
Radio Equipment (RE): "an electrical or electronic product, which intentionally emits and/or receives radio waves for
the purpose of radio communication and/or radiodetermination, or an electrical or electronic product which must be
completed with an accessory, such as antenna, so as to intentionally emit and/or receive radio waves for the purpose of
radio communication and/or radiodetermination".
NOTE: The definition above is as defined in the Radio Equipment Directive, Article 2(1)(1) [i.6].
Radio Frequency (RF) transceiver: part of radio platform converting, for transmission, baseband signals into radio
signals, and, for reception, radio signals into baseband signals
Radio Operating System (ROS): any appropriate OS empowered by RCF
NOTE: ROS provides RCF capabilities as well as traditional management capabilities related to management of
radio platform such as resource management, file system support, unified access to hardware resources,
etc.
radio platform: part of radio equipment hardware which relates to radio processing capability, including
programmable components, hardware accelerators, RF transceiver, and antenna(s)
NOTE: A Radio Platform is a piece of hardware capable of generating RF signals or receiving RF signals. By
nature, it is heterogeneous hardware including different processing elements such as fixed accelerators,
e.g. Application-Specific Integrated Circuit (ASIC), or reconfigurable accelerators, e.g. FPGAs, etc.
Radio Virtual Machine (RVM): abstract machine which supports reactive and concurrent executions
NOTE: An RVM may be implemented as a controlled execution environment which allows the selection of a
trade-off between flexibility of base band code development and required (re-)certification efforts.
reconfigurable mobile device: mobile device with radio communication capabilities providing support for radio
reconfiguration
NOTE: Reconfigurable mobile devices include but are not limited to: smartphones, feature phones, tablets, and
laptops.
reconfigurable Radio Equipment: Radio Equipment with radio communication capabilities providing support for
radio reconfiguration
NOTE: Reconfigurable Radio Equipment includes Smartphones, Feature phones, Tablets, Laptops, Connected
Vehicle communication platform, Network platform, IoT device, etc.
ETSI

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8 Draft ETSI EN 303 681-2 V1.1.2 (2020-03)
3.2 Symbols
Void.
3.3 Abbreviations
For the purposes of the present document, the following abbreviations apply:
ACK ACKnowledgement
ACKM ACKnowledgement with Modification
AP Application Processor
ASIC Application-Specific Integrated Circuit
ASN.1 Abstract Syntax Notation One
BBIC Base-Band Integrated Circuit
BLER Block Error Rate
CSL Communication Services Layer
EU European Union
gMURI generalized Multiradio Interface
gRPI generalized Radio Programming Interface
gRRFI generalized Reconfigurable Radio Frequency Interface
gURAI generalized Unified Radio Applications Interface
MIMO Multiple Input Multiple Output
MPM Mobility Policy Manager
NACK Negative ACKnowledgement
OOB Out Of Band
OS Operating System
RA Radio Application
RAN Radio Access Network
RAP Radio Application Package
RAT Radio Access Technology
RC Radio Computer
RCF Radio Control Framework
RCID Radio Computer Identification
RE Radio Equipment
RERC Radio Equipment Reconfiguration Class
RF Radio Frequency
RFIC Radio Frequency Integrated Circuit
ROS Radio Operating System
RRFI Reconfigurable Radio Frequency Interface
RVM Radio Virtual Machine
RX Reception
SINR Signal to Interference plus Noise Ratio
TR Technical Report
UML Unified Modeling Language
URA Unified Radio Applications
4 Introduction
A reconfigurable RE is capable of running multiple radios simultaneously, changing the set of radios by loading new
Radio Application Packages (RAP) and setting their parameters. All Radio Applications (RAs) are called Unified Radio
Applications (URAs) when they exhibit a common behaviour from the reconfigurable RE's point of view in ETSI
EN 303 648 [i.2]. In order to run multiple URAs, the reconfigurable RE will include Communication Services Layer
(CSL), Radio Control Frameworks (RCFs), Radio Platforms and 4 sets of interfaces for their interconnection.
ETSI

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9 Draft ETSI EN 303 681-2 V1.1.2 (2020-03)

Figure 4.1: Four sets of interfaces for reconfigurable RE
Figure 4.1 illustrates the reconfigurable RE architecture with the 4 sets of interfaces, i.e.:
• gMURI for interfacing CSL and RCF (in ETSI EN 303 681-1 [i.13]).
• gRRFI for interfacing URA and RF Transceiver, which is the scope of the present document.
• gURAI for interfacing URA and RCF (in ETSI EN 303 681-3 [i.14]).
• gRPI for allowing an independent and uniform production of RAs (in ETSI EN 303 681-4 [i.15]).
The present document defines gRRFI.
ETSI

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10 Draft ETSI EN 303 681-2 V1.1.2 (2020-03)
<< in t e rf a ce >>
IgM U R I
<< in t e rf a ce >>
IgRRF I
RadioComputer
<< in t e rf a ce >>
IgU R AI
<< in t e rf a ce>>
IgR PI

Figure 4.2: UML class diagram for RC interfaces
Figure 4.2 illustrates UML class diagram for RC interfaces. The reconfigurable RE may be seen as RCs where
individual URAs are engineered as software entities in ETSI EN 303 648 [i.2].
The present document is organized as follows:
• clause 5 describes the system identification;
• clause 6 describes the notational tool for defining both information model classes and interface classes;
• clause 7 describes the information model for RC; and
• clause 8 describes the interface definition.
While UML is used for defining the information model and protocol related to gRRFI, other modelling languages could
be used as well.
5 System Identification
5.1 Radio Computer Structure
Figure 5.1 illustrates how URA and RF Transceiver interacts with each other using gRRFI.
ETSI

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11 Draft ETSI EN 303 681-2 V1.1.2 (2020-03)

Figure 5.1: Interconnection between URA and RF Transceiver
using gRRFI for reconfigurable RE
As shown in figure 5.1, gRRFI can support up to 5 kinds of services depending on the applicable RERC [1].
A Reconfigurable RE shall support all the services as required by the corresponding RERC as shown in table 5.1 and
fully detailed in clause 8 of the present document. In case that a reconfigurable RE supports multiple RERCs, the
concerned reconfigurable RE shall support all the services as defined in table 5.1.
Table 5.1: Required services of gRRFI according to each RERC
Radio Equipment Antenna
Spectrum Power Control Tx/Rx Chain RVM Protection
Reconfiguration Management
Control services services Control services services
Class services
RERC-0 No No No No No
RERC-1 Yes Yes No No Yes
Yes
RERC-2, RERC-5 Yes Yes Yes Yes
(see note)
RERC-3, RERC-6 Yes Yes Yes Yes Yes
RERC-4, RERC-7 Yes Yes Yes Yes Yes
NOTE: Among the various Tx/Rx Chain Control services, only the service related with Tx/Rx timing is required in this
case.

A corresponding summary of the services is given below:
• Spectrum Control services
- These services are used to set up spectrum-related parameters such as carrier frequency, bandwidth,
sampling frequency, etc. that will be determined according to the URAs they are related to.
• Power Control services
- These services are used to set up RF power-related parameters such as maximum transmit (Tx) power
level, Tx power level per antenna, receive (Rx) gain, etc. Specific power schemes which have to be
controlled according to the communication circumstance around the reconfigurable RE are also included
in the Power Control services.
• Antenna Management services
- These services are used to determine the antenna configuration. Antenna radiation pattern, antenna gain,
antenna direction, sector configuration, polarization, frequency range, etc. are some factors to be
considered in the Antenna Management services.
NOTE: Antenna Management services depend on the configurability of the antenna.
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12 Draft ETSI EN 303 681-2 V1.1.2 (2020-03)
• Tx/Rx Chain Control services
- These services are used to provide parameters related to real-time control of the RF transceiver chain.
Parameters to be controlled using the Tx/Rx Chain Control services include (but are not limited to) Tx
start/stop time, Rx start/stop time, spectrum- and/or power-related values.
• RVM Protection services
- These services are used to provide parameters related to the selection of RVM protection class.
Parameters to be controlled using the RVM Protection services include (but are not limited to) selection
and/or request of RF protection class as well as, RF Front-end indication of input data signals
modification.
The clauses 5.2 to 5.4 describe the components/entities shown in figure 5.1.
5.2 URA
RAs need to be subject to a common reconfiguration, multiradio execution and resource sharing strategy framework
(depending on the concerned RERC). Since all RAs exhibit a common behaviour from the reconfigurable RE
perspective, those RAs are called URAs [i.8].
5.3 RF Transceiver
RF Transceiver, which includes transceiver chain(s), is part of the radio platform in RC that transforms, in Tx mode, the
baseband signal to radio signal, and in Rx mode, the radio signal to baseband signal.
5.4 RF Interfaces
The RF Interfaces depicted in figure 5.1 denote digital interfaces which define the physical interconnections between
SM
base-band and RFIC (Radio Frequency Integrated Circuit), for example, the DigRF specification defining the
interface between an
...

SLOVENSKI STANDARD
oSIST prEN 303 681-2 V1.1.2:2020
01-julij-2020
Radijski sistemi z možnostjo preoblikovanja (RRS) - Informacijski modeli in
protokoli za radijsko opremo (RE) za splošno arhitekturo preoblikovanja
programske opreme - 2. del: Splošni spremenljivi radiofrekvenčni vmesnik (gRRFI)
Reconfigurable Radio Systems (RRS) - Radio Equipment (RE) information models and
protocols for generalized software reconfiguration architecture - Part 2: generalized
Reconfigurable Radio Frequency Interface (gRRFI)
Ta slovenski standard je istoveten z: ETSI EN 303 681-2 V1.1.2 (2020-03)
ICS:
33.060.01 Radijske komunikacije na Radiocommunications in
splošno general
35.200 Vmesniška in povezovalna Interface and interconnection
oprema equipment
oSIST prEN 303 681-2 V1.1.2:2020 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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oSIST prEN 303 681-2 V1.1.2:2020

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oSIST prEN 303 681-2 V1.1.2:2020
Draft ETSI EN 303 681-2 V1.1.2 (2020-03)






EUROPEAN STANDARD
Reconfigurable Radio Systems (RRS);
Radio Equipment (RE) information models and protocols
for generalized software reconfiguration architecture;
Part 2: generalized Reconfigurable
Radio Frequency Interface (gRRFI)

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oSIST prEN 303 681-2 V1.1.2:2020
 2 Draft ETSI EN 303 681-2 V1.1.2 (2020-03)



Reference
REN/RRS-0229
Keywords
interface, radio, SDR

ETSI
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®
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ETSI

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oSIST prEN 303 681-2 V1.1.2:2020
 3 Draft ETSI EN 303 681-2 V1.1.2 (2020-03)
Contents
Intellectual Property Rights . 4
Foreword . 4
Modal verbs terminology . 4
1 Scope . 5
2 References . 5
2.1 Normative references . 5
2.2 Informative references . 5
3 Definition of terms, symbols and abbreviations . 6
3.1 Terms . 6
3.2 Symbols . 8
3.3 Abbreviations . 8
4 Introduction . 8
5 System Identification . 10
5.1 Radio Computer Structure . 10
5.2 URA . 12
5.3 RF Transceiver . 12
5.4 RF Interfaces . 12
5.5 Radio Computer RF System Requirement Mapping . 12
6 Notational Tools . 13
6.1 Notational Tool for Information Model Classes . 13
6.2 Notational Tool for Interface Classes . 13
7 Information Model for Radio Computer . 13
7.1 Radio Computer . 13
7.2 Class Definitions for Information Model . 16
8 Interface Definition . 21
8.1 Interface Overview . 21
8.2 Spectrum Control Services . 24
8.2.1 Overview on Spectrum Control Services . 24
8.2.2 Messages for Spectrum Control Services . 24
8.3 Power Control Services . 25
8.3.1 Overview on Power Control Services . 25
8.3.2 Messages for Power Control Services . 25
8.4 Antenna Management Services . 25
8.4.1 Overview on Antenna Management Services . 25
8.4.2 Messages for Antenna Management Services. 26
8.5 Tx/Rx Chain Control Services. 26
8.5.1 Overview on Tx/Rx Chain Control Services . 26
8.5.2 Messages for Tx/Rx Chain Control Services . 26
8.6 RVM Protection Services . 27
8.6.1 Overview on RVM Protection Services . 27
8.6.2 Messages for RVM Protection Services . 28
8.7 Class Definitions for Interface . 28
Annex A (informative): Abstract Data Definitions . 31
Annex B (informative): gRRFI Qualification Methods for Validation . 35
History . 36

ETSI

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oSIST prEN 303 681-2 V1.1.2:2020
 4 Draft ETSI EN 303 681-2 V1.1.2 (2020-03)
Intellectual Property Rights
Essential patents
IPRs essential or potentially essential to normative deliverables may have been declared to ETSI. The information
pertaining to these essential IPRs, if any, is publicly available for ETSI members and non-members, and can be found
in ETSI SR 000 314: "Intellectual Property Rights (IPRs); Essential, or potentially Essential, IPRs notified to ETSI in
respect of ETSI standards", which is available from the ETSI Secretariat. Latest updates are available on the ETSI Web
server (https://ipr.etsi.org/).
Pursuant to the ETSI IPR Policy, no investigation, including IPR searches, has been carried out by ETSI. No guarantee
can be given as to the existence of other IPRs not referenced in ETSI SR 000 314 (or the updates on the ETSI Web
server) which are, or may be, or may become, essential to the present document.
Trademarks
The present document may include trademarks and/or tradenames which are asserted and/or registered by their owners.
ETSI claims no ownership of these except for any which are indicated as being the property of ETSI, and conveys no
right to use or reproduce any trademark and/or tradename. Mention of those trademarks in the present document does
not constitute an endorsement by ETSI of products, services or organizations associated with those trademarks.
Foreword
This draft European Standard (EN) has been produced by ETSI Technical Committee Reconfigurable Radio Systems
(RRS), and is now submitted for the combined Public Enquiry and Vote phase of the ETSI standards EN Approval
Procedure.
The present document is part 2 of a multi-part deliverable covering the Radio Equipment (RE) information models and
protocols, as identified below:
Part 1: "generalized Multiradio Interface (gMURI)";
Part 2: "generalized Reconfigurable Radio Frequency Interface (gRRFI)";
Part 3: "generalized Unified Radio Application Interface (gURAI)";
Part 4: "generalized Radio Programming Interface (gRPI)".

Proposed national transposition dates
Date of latest announcement of this EN (doa): 3 months after ETSI publication
Date of latest publication of new National Standard
or endorsement of this EN (dop/e): 6 months after doa
Date of withdrawal of any conflicting National Standard (dow): 6 months after doa

Modal verbs terminology
In the present document "shall", "shall not", "should", "should not", "may", "need not", "will", "will not", "can" and
"cannot" are to be interpreted as described in clause 3.2 of the ETSI Drafting Rules (Verbal forms for the expression of
provisions).
"must" and "must not" are NOT allowed in ETSI deliverables except when used in direct citation.
ETSI

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oSIST prEN 303 681-2 V1.1.2:2020
 5 Draft ETSI EN 303 681-2 V1.1.2 (2020-03)
1 Scope
The present document defines an information model and protocol for generalized reconfigurable radio frequency
interface for reconfigurable REs except for reconfigurable mobile devices which are covered in [i.7] to [i.12]. The work
is based on the Use Cases defined in ETSI TR 103 585 [i.1], on the system requirements defined in ETSI
EN 303 641 [1] and on the radio reconfiguration related architecture for reconfigurable RE defined in ETSI
EN 303 648 [i.2].
The present document will be based on ETSI EN 303 146-2 [i.10] and provide a generalized interface definition for the
generalized Reconfigurable Radio Frequency Interface.
2 References
2.1 Normative references
References are either specific (identified by date of publication and/or edition number or version number) or
non-specific. For specific references, only the cited version applies. For non-specific references, the latest version of the
referenced document (including any amendments) applies.
Referenced documents which are not found to be publicly available in the expected location might be found at
https://docbox.etsi.org/Reference/.
NOTE: While any hyperlinks included in this clause were valid at the time of publication, ETSI cannot guarantee
their long term validity.
The following referenced documents are necessary for the application of the present document.
[1] ETSI EN 303 641: "Reconfigurable Radio Systems (RRS); Radio Equipment (RE) reconfiguration
requirements".
2.2 Informative references
References are either specific (identified by date of publication and/or edition number or version number) or
non-specific. For specific references, only the cited version applies. For non-specific references, the latest version of the
referenced document (including any amendments) applies.
NOTE: While any hyperlinks included in this clause were valid at the time of publication, ETSI cannot guarantee
their long term validity.
The following referenced documents are not necessary for the application of the present document but they assist the
user with regard to a particular subject area.
[i.1] ETSI TR 103 585: "Reconfigurable Radio Systems (RRS); Radio Equipment (RE) reconfiguration
use cases".
[i.2] ETSI EN 303 648: "Reconfigurable Radio Systems (RRS); Radio Equipment (RE) reconfiguration
architecture".
[i.3] IEEE 1900.4™-2009: "IEEE Standard for Architectural Building Blocks Enabling Network-
Device Distributed Decision Making for Optimized Radio Resource Usage in Heterogeneous
Wireless Access Networks".
®
[i.4] DigRFSM Working Group: "MIPI Alliance Specification for DigRFSM v4".
[i.5] Recommendation ITU-T X.680: "Information technology - Abstract Syntax Notation One
(ASN.1): Specification of basic notation".
[i.6] Directive 2014/53/EU of the European Parliament and of the Council of 16 April 2014 on the
harmonisation of the laws of the Member States relating to the making available on the market of
Radio Equipment and repealing Directive 1999/5/EC.
ETSI

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 6 Draft ETSI EN 303 681-2 V1.1.2 (2020-03)
[i.7] ETSI EN 302 969: "Reconfigurable Radio Systems (RRS); Radio Reconfiguration related
Requirements for Mobile Devices".
[i.8] ETSI EN 303 095: "Reconfigurable Radio Systems (RRS); Radio reconfiguration related
architecture for Mobile Devices (MD)".
[i.9] ETSI EN 303 146-1: "Reconfigurable Radio Systems (RRS); Mobile Device (MD) information
models and protocols; Part 1: Multiradio Interface (MURI)".
[i.10] ETSI EN 303 146-2: "Reconfigurable Radio Systems (RRS); Mobile Device (MD) information
models and protocols; Part 2: Reconfigurable Radio Frequency Interface (RRFI)".
[i.11] ETSI EN 303 146-3: "Reconfigurable Radio Systems (RRS); Mobile Device (MD) information
models and protocols; Part 3: Unified Radio Application Interface (URAI)".
[i.12] ETSI EN 303 146-4: "Reconfigurable Radio Systems (RRS); Mobile Device (MD) information
models and protocols; Part 4: Radio Programming Interface (RPI)".
[i.13] ETSI EN 303 681-1: "Reconfigurable Radio Systems (RRS); Radio Equipment (RE) information
models and protocols for generalized software reconfiguration architecture; Part 1: generalized
Multiradio Interface (gMURI)".
[i.14] ETSI EN 303 681-3: "Reconfigurable Radio Systems (RRS); Radio Equipment (RE) information
models and protocols for generalized software reconfiguration architecture; Part 3: generalized
Unified Radio Application Interface (gURAI)".
[i.15] ETSI EN 303 681-4: "Reconfigurable Radio Systems (RRS); adio Equipment (RE) information
models and protocols for generalized software reconfiguration architecture; Part 4: generalized
Radio Programming Interface (gRPI)".
3 Definition of terms, symbols and abbreviations
3.1 Terms
For the purposes of the present document, the following terms apply:
association: logical communication link to a Radio Access Network or a peer equipment
NOTE 1: Typically, some control signalling is necessary to maintain the association. No user data transfer may
occur with only an association present, but a data flow may be established into an association for this
purpose.
NOTE 2: Peer equipment is any communication counterpart of a reconfigurable Radio Equipment. It can be
reached by establishing a logical communication link (i.e. an association) between the reconfigurable
Radio Equipment and peer equipment.
channel: designated part of the information transfer capability having specified characteristics, provided at the user
network interface
NOTE: It is the over-the-air wireless propagation channel which is used to convey an information signal from
transmitter to receiver. This definition is specified in ETSI EN 303 648 [i.2].
Communication Services Layer (CSL): layer related to communication services supporting generic applications
NOTE: A communication services layer supports generic applications like Internet access. In the present
document, it consists of Administrator, Mobility Policy Manager (MPM), Networking stack and Monitor.
link: connection from one location to another through a given Radio Access Technology for the purpose of transmitting
and receiving digital information
NOTE: Each Link is conveyed over a given Channel.
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Radio Application (RA): software which enforces the generation of the transmit RF signals or the decoding of the
receive RF signals
NOTE 1: The software is executed on a particular radio platform or an RVM as part of the radio platform.
NOTE 2: RAs might have different forms of representation. They are represented as:
 source codes including Radio Library calls of Radio Library native implementation and Radio HAL
calls;
 IRs including Radio Library calls of Radio Library native implementation and radio HAL calls;
 executable codes for a particular radio platform.
Radio Computer (RC): part of Radio Equipment working under ROS control and on which RAs are executed
NOTE: A Radio Computer typically includes programmable processors, hardware accelerators, peripherals,
software, etc. RF part is considered to be part of peripherals.
Radio Control Framework (RCF): control framework which, as a part of the OS, extends OS capabilities in terms of
radio resource management
NOTE: RCF is a control framework which consists of Configuration Manager (CM), Radio Connection Manager
(RCM), Flow Controller (FC), Multiradio Controller (MRC) and Resource Manager (RM) which is
typically part of OS.
Radio Equipment (RE): "an electrical or electronic product, which intentionally emits and/or receives radio waves for
the purpose of radio communication and/or radiodetermination, or an electrical or electronic product which must be
completed with an accessory, such as antenna, so as to intentionally emit and/or receive radio waves for the purpose of
radio communication and/or radiodetermination".
NOTE: The definition above is as defined in the Radio Equipment Directive, Article 2(1)(1) [i.6].
Radio Frequency (RF) transceiver: part of radio platform converting, for transmission, baseband signals into radio
signals, and, for reception, radio signals into baseband signals
Radio Operating System (ROS): any appropriate OS empowered by RCF
NOTE: ROS provides RCF capabilities as well as traditional management capabilities related to management of
radio platform such as resource management, file system support, unified access to hardware resources,
etc.
radio platform: part of radio equipment hardware which relates to radio processing capability, including
programmable components, hardware accelerators, RF transceiver, and antenna(s)
NOTE: A Radio Platform is a piece of hardware capable of generating RF signals or receiving RF signals. By
nature, it is heterogeneous hardware including different processing elements such as fixed accelerators,
e.g. Application-Specific Integrated Circuit (ASIC), or reconfigurable accelerators, e.g. FPGAs, etc.
Radio Virtual Machine (RVM): abstract machine which supports reactive and concurrent executions
NOTE: An RVM may be implemented as a controlled execution environment which allows the selection of a
trade-off between flexibility of base band code development and required (re-)certification efforts.
reconfigurable mobile device: mobile device with radio communication capabilities providing support for radio
reconfiguration
NOTE: Reconfigurable mobile devices include but are not limited to: smartphones, feature phones, tablets, and
laptops.
reconfigurable Radio Equipment: Radio Equipment with radio communication capabilities providing support for
radio reconfiguration
NOTE: Reconfigurable Radio Equipment includes Smartphones, Feature phones, Tablets, Laptops, Connected
Vehicle communication platform, Network platform, IoT device, etc.
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3.2 Symbols
Void.
3.3 Abbreviations
For the purposes of the present document, the following abbreviations apply:
ACK ACKnowledgement
ACKM ACKnowledgement with Modification
AP Application Processor
ASIC Application-Specific Integrated Circuit
ASN.1 Abstract Syntax Notation One
BBIC Base-Band Integrated Circuit
BLER Block Error Rate
CSL Communication Services Layer
EU European Union
gMURI generalized Multiradio Interface
gRPI generalized Radio Programming Interface
gRRFI generalized Reconfigurable Radio Frequency Interface
gURAI generalized Unified Radio Applications Interface
MIMO Multiple Input Multiple Output
MPM Mobility Policy Manager
NACK Negative ACKnowledgement
OOB Out Of Band
OS Operating System
RA Radio Application
RAN Radio Access Network
RAP Radio Application Package
RAT Radio Access Technology
RC Radio Computer
RCF Radio Control Framework
RCID Radio Computer Identification
RE Radio Equipment
RERC Radio Equipment Reconfiguration Class
RF Radio Frequency
RFIC Radio Frequency Integrated Circuit
ROS Radio Operating System
RRFI Reconfigurable Radio Frequency Interface
RVM Radio Virtual Machine
RX Reception
SINR Signal to Interference plus Noise Ratio
TR Technical Report
UML Unified Modeling Language
URA Unified Radio Applications
4 Introduction
A reconfigurable RE is capable of running multiple radios simultaneously, changing the set of radios by loading new
Radio Application Packages (RAP) and setting their parameters. All Radio Applications (RAs) are called Unified Radio
Applications (URAs) when they exhibit a common behaviour from the reconfigurable RE's point of view in ETSI
EN 303 648 [i.2]. In order to run multiple URAs, the reconfigurable RE will include Communication Services Layer
(CSL), Radio Control Frameworks (RCFs), Radio Platforms and 4 sets of interfaces for their interconnection.
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Figure 4.1: Four sets of interfaces for reconfigurable RE
Figure 4.1 illustrates the reconfigurable RE architecture with the 4 sets of interfaces, i.e.:
• gMURI for interfacing CSL and RCF (in ETSI EN 303 681-1 [i.13]).
• gRRFI for interfacing URA and RF Transceiver, which is the scope of the present document.
• gURAI for interfacing URA and RCF (in ETSI EN 303 681-3 [i.14]).
• gRPI for allowing an independent and uniform production of RAs (in ETSI EN 303 681-4 [i.15]).
The present document defines gRRFI.
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<>
IgMURI
<>
IgRRFI
RadioComputer
<>
IgURAI
<>
IgRPI

Figure 4.2: UML class diagram for RC interfaces
Figure 4.2 illustrates UML class diagram for RC interfaces. The reconfigurable RE may be seen as RCs where
individual URAs are engineered as software entities in ETSI EN 303 648 [i.2].
The present document is organized as follows:
• clause 5 describes the system identification;
• clause 6 describes the notational tool for defining both information model classes and interface classes;
• clause 7 describes the information model for RC; and
• clause 8 describes the interface definition.
While UML is used for defining the information model and protocol related to gRRFI, other modelling languages could
be used as well.
5 System Identification
5.1 Radio Computer Structure
Figure 5.1 illustrates how URA and RF Transceiver interacts with each other using gRRFI.
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Figure 5.1: Interconnection between URA and RF Transceiver
using gRRFI for reconfigurable RE
As shown in figure 5.1, gRRFI can support up to 5 kinds of services depending on the applicable RERC [1].
A Reconfigurable RE shall support all the services as required by the corresponding RERC as shown in table 5.1 and
fully detailed in clause 8 of the present document. In case that a reconfigurable RE supports multiple RERCs, the
concerned reconfigurable RE shall support all the services as defined in table 5.1.
Table 5.1: Required services of gRRFI according to each RERC
Radio Equipment Antenna
Spectrum Power Control Tx/Rx Chain RVM Protection
Reconfiguration Management
Control services services Control services services
Class services
RERC-0 No No No No No
RERC-1 Yes Yes No No Yes
Yes
RERC-2, RERC-5 Yes Yes Yes Yes
(see note)
RERC-3, RERC-6 Yes Yes Yes Yes Yes
RERC-4, RERC-7 Yes Yes Yes Yes Yes
NOTE: Among the various Tx/Rx Chain Control services, only the service related with Tx/Rx timing is required in this
case.

A corresponding summary of the services is given below:
• Spectrum Control services
- These services are used to set up spectrum-related parameters such as carrier frequency, bandwidth,
sampling frequency, etc. that will be determined according to the URAs they are related to.
• Power Control services
- These services are used to set up RF power-related parameters such as maximum transmit (Tx) power
level, Tx power level per antenna, receive (Rx) gain, etc. Specific power schemes which have to be
controlled according to the communication circumstance around the reconfigurable RE are also included
in the Power Control services.
• Antenna Management services
- These services are used to determine the antenna configuration. Antenna radiation pattern, antenna gain,
antenna direction, sector configuration, polarization, frequency range, etc. are some factors to be
considered in the Antenna Management services.
NOTE: Antenna Management services depend on the configurability of the antenna.
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• Tx/Rx Chain Control services
- These services are used to provide parameters related
...