Electronic fee collection - Interface definition for on-board account using integrated circuit card (ICC) (ISO 25110:2017)

ISO 25110:2017 defines the data transfer models between roadside equipment (RSE) and integrated circuit card (ICC) and the interface descriptions between the RSE and on-board equipment (OBE) for on-board accounts using the ICC. It also provides examples of interface definitions and transactions deployed in several countries.

Elektronische Gebührenerhebung - Schnittstellendefinition für die fahrzeugseitige bordeigene Datenverwaltung mit Chipkarte (ICC) (ISO 25110:2017)

Perception du télépéage - Définition d'interface pour compte de bord utilisant une carte à circuit intégré (ICC) (ISO 25110:2017)

ISO 25110:2017 définit les modèles de transfert de données entre les équipements routiers (RSE) et les cartes à circuit intégré (ICC), et décrit les interfaces entre les RSE et l'équipement embarqué (OBE) pour le compte de bord s'appuyant sur l'ICC. Il fournit également des exemples de définitions d'interfaces et de transactions déployées dans plusieurs pays.
ISO 25110:2017 couvre les aspects suivants:
- modèles de transfert de données entre les RSE et les ICC correspondant aux exigences opérationnelles catégorisées, et le mécanisme de transfert des données pour chaque modèle,
- définition d'interface entre RSE et OBE en fonction de chaque modèle de transfert de données,
- définition d'interface pour chaque modèle,
- configuration fonctionnelle,
- définition des commandes RSE pour l'accès à l'ICC,
- format des données et définition des éléments de données pour les commandes RSE, et
- un exemple de transaction pour chaque modèle en Annexe B.

Elektronsko pobiranje pristojbin - Definicija vmesnika za obračun pristojbin, ki uporablja kartico z integriranim vezjem (ICC) (ISO 25110:2017)

Ta dokument določa načine prenosa podatkov med obcestno opremo (RSE) in kartico z integriranim vezjem (ICC) ter opise vmesnikov med obcestno opremo in opremo v vozilu za obračun pristojbin (OBE), ki uporablja kartico z integriranim vezjem. Podaja tudi primere definicij vmesnika in transakcije, ki se uporabljajo v več državah.
Ta dokument obravnava:
– načine prenosa podatkov med obcestno opremo in kartico z integriranim vezjem, ki ustreza kategoriziranim zahtevam delovanja, ter način prenosa podatkov za vsak model;
– definicijo vmesnika med obcestno opremo in kartico z integriranim vezjem, ki temelji na posameznem modelu prenosa podatkov;
– definicijo vmesnika za vsak model;
– funkcionalno konfiguracijo;
– definicijo upravljanja obcestne opreme za dostop s kartico z integriranim vezjem;
– obliko podatkov in definicije elementov podatkov ukazov za obcestno opremo;
– primer prenosa za vsak model v dodatku B.

General Information

Status
Published
Publication Date
05-Dec-2017
Current Stage
6060 - Definitive text made available (DAV) - Publishing
Due Date
06-Dec-2017
Completion Date
06-Dec-2017

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SLOVENSKI STANDARD
SIST EN ISO 25110:2018
01-april-2018
1DGRPHãþD
SIST-TS CEN ISO/TS 25110:2013
(OHNWURQVNRSRELUDQMHSULVWRMELQ'HILQLFLMDYPHVQLND]DREUDþXQSULVWRMELQNL
XSRUDEOMDNDUWLFR]LQWHJULUDQLPYH]MHP ,&&  ,62

Electronic fee collection - Interface definition for on-board account using integrated circuit

card (ICC) (ISO 25110:2017)

Perception du télépéage - Définition d'interface pour compte de bord utilisant une carte à

circuit intégré (ICC) (ISO 25110:2017)
Ta slovenski standard je istoveten z: EN ISO 25110:2017
ICS:
03.220.01 Transport na splošno Transport in general
35.240.60 Uporabniške rešitve IT v IT applications in transport
prometu
SIST EN ISO 25110:2018 en,fr,de

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

---------------------- Page: 1 ----------------------
SIST EN ISO 25110:2018
---------------------- Page: 2 ----------------------
SIST EN ISO 25110:2018
EN ISO 25110
EUROPEAN STANDARD
NORME EUROPÉENNE
December 2017
EUROPÄISCHE NORM
ICS 03.220.01; 35.240.60 Supersedes CEN ISO/TS 25110:2013
English Version
Electronic fee collection - Interface definition for on-board
account using integrated circuit card (ICC) (ISO
25110:2017)

Perception du télépéage - Définition d'interface pour Elektronische Gebührenerhebung -

compte de bord utilisant une carte à circuit intégré Schnittstellendefinition für die fahrzeugseitige

(ICC) (ISO 25110:2017) bordeigene Datenverwaltung mit Chipkarte (ICC) (ISO
25110:2017)
This European Standard was approved by CEN on 22 November 2017.

CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this

European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references

concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN

member.

This European Standard exists in three official versions (English, French, German). A version in any other language made by

translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management

Centre has the same status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,

Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania,

Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,

Turkey and United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels

© 2017 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 25110:2017 E

worldwide for CEN national Members.
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SIST EN ISO 25110:2018
EN ISO 25110:2017 (E)
Contents Page

European foreword ....................................................................................................................................................... 3

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SIST EN ISO 25110:2018
EN ISO 25110:2017 (E)
European foreword

This document (EN ISO 25110:2017) has been prepared by Technical Committee ISO/TC 204

"Intelligent transport systems" in collaboration with Technical Committee CEN/TC 278 “Intelligent

transport systems” the secretariat of which is held by NEN.

This European Standard shall be given the status of a national standard, either by publication of an

identical text or by endorsement, at the latest by June 2018, and conflicting national standards shall be

withdrawn at the latest by June 2018.

Attention is drawn to the possibility that some of the elements of this document may be the subject of

patent rights. CEN shall not be held responsible for identifying any or all such patent rights.

This document supersedes CEN ISO/TS 25110:2013.

This document has been prepared under a mandate given to CEN by the European Commission and the

European Free Trade Association.

According to the CEN-CENELEC Internal Regulations, the national standards organizations of the

following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria,

Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia,

France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta,

Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,

Turkey and the United Kingdom.
Endorsement notice

The text of ISO 25110:2017 has been approved by CEN as EN ISO 25110:2017 without any modification.

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SIST EN ISO 25110:2018
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SIST EN ISO 25110:2018
INTERNATIONAL ISO
STANDARD 25110
First edition
2017-11
Electronic fee collection — Interface
definition for on-board account using
integrated circuit card (ICC)
Perception du télépéage — Définition d'interface pour compte de
bord utilisant une carte à circuit intégré (ICC)
Reference number
ISO 25110:2017(E)
ISO 2017
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SIST EN ISO 25110:2018
ISO 25110:2017(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2017, Published in Switzerland

All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized otherwise in any form

or by any means, electronic or mechanical, including photocopying, or posting on the internet or an intranet, without prior

written permission. Permission can be requested from either ISO at the address below or ISO’s member body in the country of

the requester.
ISO copyright office
Ch. de Blandonnet 8 • CP 401
CH-1214 Vernier, Geneva, Switzerland
Tel. +41 22 749 01 11
Fax +41 22 749 09 47
copyright@iso.org
www.iso.org
ii © ISO 2017 – All rights reserved
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SIST EN ISO 25110:2018
ISO 25110:2017(E)
Contents Page

Foreword ........................................................................................................................................................................................................................................iv

Introduction ..................................................................................................................................................................................................................................v

1 Scope ................................................................................................................................................................................................................................. 1

2 Normative references ...................................................................................................................................................................................... 2

3 Terms and definitions ..................................................................................................................................................................................... 2

4 Abbreviated terms .............................................................................................................................................................................................. 4

5 Data transfer models........................................................................................................................................................................................ 5

5.1 General ........................................................................................................................................................................................................... 5

5.1.1 Transparent type ............................................................................................................................................................. 5

5.1.2 Caching type......................................................................................................................................................................... 5

5.1.3 Buffering type ..................................................................................................................................................................... 5

5.2 Symbols ......................................................................................................................................................................................................... 6

5.3 Transparent type ................................................................................................................................................................................... 6

5.3.1 General...................................................................................................................................................................................... 6

5.3.2 Data transfer process ................................................................................................................................................... 6

5.4 Caching type .............................................................................................................................................................................................. 7

5.4.1 General...................................................................................................................................................................................... 7

5.4.2 Data transfer process ................................................................................................................................................... 7

5.5 Buffering type .......................................................................................................................................................................................... 8

5.5.1 General...................................................................................................................................................................................... 8

5.5.2 Data transfer process ................................................................................................................................................... 8

6 Interface definition for ICC access ...................................................................................................................................................... 9

6.1 Transparent type ................................................................................................................................................................................... 9

6.1.1 Functional configuration ........................................................................................................................................... 9

6.1.2 Command and response between the RSE and OBU .....................................................................10

6.2 Caching type ...........................................................................................................................................................................................10

6.2.1 Functional configuration ........................................................................................................................................10

6.2.2 Command and response between the RSE and OBU .....................................................................11

6.3 Buffering type .......................................................................................................................................................................................11

6.3.1 Functional configuration ........................................................................................................................................11

6.3.2 Command and response between the RSE and OBU .....................................................................12

Annex A (informative) On-board account requirements ..............................................................................................................13

Annex B (informative) Example of an ICC access method ............................................................................................................15

Annex C (informative) Interoperability relation with other sectors ................................................................................31

Bibliography .............................................................................................................................................................................................................................33

© ISO 2017 – All rights reserved iii
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SIST EN ISO 25110:2018
ISO 25110:2017(E)
Foreword

ISO (the International Organization for Standardization) is a worldwide federation of national standards

bodies (ISO member bodies). The work of preparing International Standards is normally carried out

through ISO technical committees. Each member body interested in a subject for which a technical

committee has been established has the right to be represented on that committee. International

organizations, governmental and non-governmental, in liaison with ISO, also take part in the work.

ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of

electrotechnical standardization.

The procedures used to develop this document and those intended for its further maintenance are

described in the ISO/IEC Directives, Part 1. In particular the different approval criteria needed for the

different types of ISO documents should be noted. This document was drafted in accordance with the

editorial rules of the ISO/IEC Directives, Part 2 (see www.iso.org/directives).

Attention is drawn to the possibility that some of the elements of this document may be the subject of

patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of

any patent rights identified during the development of the document will be in the Introduction and/or

on the ISO list of patent declarations received (see www.iso.org/patents).

Any trade name used in this document is information given for the convenience of users and does not

constitute an endorsement.

For an explanation on the voluntary nature of standards, the meaning of ISO specific terms and

expressions related to conformity assessment, as well as information about ISO's adherence to the

World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT) see the following

URL: www.iso.org/iso/foreword.html.

This document was prepared by Technical Committee ISO/TC 204, Intelligent transport systems.

This first edition cancels and replaces the second edition of ISO/TS 25110:2013.
The main changes compared to the previous edition are as follows:

— the document has been converted from a Technical Specification to an International Standard;

— terms have been amended, in order to reflect harmonization of terms across electronic fee collection

(EFC) standards.
iv © ISO 2017 – All rights reserved
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SIST EN ISO 25110:2018
ISO 25110:2017(E)
Introduction
Background and motivation

There are two payment systems dealing with electronic fee collection (EFC). The first is the central

account system using a one-piece on-board unit (OBU) and the second is the on-board account system

using a payment media such as the integrated circuit card (ICC).

ICCs have been widely used for public transport cards such as subway and bus payment means and

electronic money cards for general purpose payments, as well as for credit cards and banking cards.

The ICC is expected to be used for EFC payment means along with these global trends and provides

convenience and flexibility.

Currently, the descriptions in the existing EFC-related International Standards are focused on the

central account system, which is rather simple and gives more feasibility for EFC interoperability than

the on-board account system, which is complex and has more items to be settled.

With consideration of the widespread use for transport cards or electronic money cards, a new

International Standard relating the on-board account system using those ICCs is strongly required as

shown in Figure 1. Furthermore, a state-of-the-art mobile phone integrated with ICC functions, a so-

called “mobile electronic purse”, has been used for public transport or retail shopping as a payment

means in some countries so rapidly that standardization on this theme is important and essential for

considering future EFC payment methods as well.
< OBE main body >
― Communication control
< One-piece OBU >
― EFC application control
― Communication control
― EFC-related data
― EFC application control
― EFC-related data
― Payment-related data Functionally
separated
Result: More
< IC card or other media >
convenient
― Payment-related data
and le xible
Use: Existing cards such as
public transport card or
credit card etc., or
new future media
Figure 1 — Motivation for on-board account using ICC
© ISO 2017 – All rights reserved v
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CN/GNSS
DSRC
SIST EN ISO 25110:2018
ISO 25110:2017(E)

Figure 2 shows the scope of the EFC standards, in which the OBU is used as a communication means and

the ICC carries the payment means.
PAYMENT SYSTEM A PAYMENT SYSTEM B
ISSUER
COLLECTION/
CLEARING
CLEARING
LOADING
SERVICE
PROVIDER
USER
IC card
OBU
Figure 2 — Illustration of the scope of the EFC standards
Objective

The objective of this document is to classify data transfer models based on operational requirements

and define a specific ICC access interface for on-board accounts using the ICC for each model.

Furthermore, this document provides practical examples of transactions in Annex B, for consideration

and easy adoption by toll road operators.
Use

This document provides a common technical platform for on-board accounts using ICCs to deal with

various operational requirements and practical examples of on-board accounts actually used or

planned in several countries.

Each toll road operator can establish their own specification by selecting an example of the models in

this document (like a tool box) so as to meet their requirements.
vi © ISO 2017 – All rights reserved
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SIST EN ISO 25110:2018
INTERNATIONAL STANDARD ISO 25110:2017(E)
Electronic fee collection — Interface definition for on-
board account using integrated circuit card (ICC)
1 Scope

This document defines the data transfer models between roadside equipment (RSE) and integrated

circuit card (ICC) and the interface descriptions between the RSE and on-board equipment (OBE) for

on-board accounts using the ICC. It also provides examples of interface definitions and transactions

deployed in several countries.
This document covers:

— data transfer models between the RSE and ICC which correspond to the categorized operational

requirements and the data transfer mechanism for each model;

— interface definition between the RSE and OBE based on each data transfer model;

— interface definition for each model;
— functional configuration;
— RSE command definitions for ICC access;
— data format and data element definitions of RSE commands;
— a transaction example for each model in Annex B.

Figure 3 shows the configuration of an on-board account and the scope of this document. The

descriptions in this document focus on the interface between the RSE and OBU to access the ICC.

DSRC IC card I/F
Roadside
Central
On-board unit
IC card
equipment
system
(OBU)
(RSE)
Generic scope of this document
Figure 3 — Configuration of an on-board account and the scope of this document

Figure 4 shows the layer structure of the RSE, OBU and ICC where the mid-layer of application interfaces

are denoted as the practical scope of this document.

NOTE The existing standards for physical and other protocol layers both between the RSE and OBE, and

between OBE and ICC, are outside the scope of this document. For example, DSRC-related items (L-1, L-2 and L-7)

and ICC-related items (ICC commands, data definition, etc.) are outside the scope of this document.

There are two types of virtual bridges contained in an OBU. The first type is Bridge-1 on which an RSE

command sent from the RSE is decomposed and the ICC access command contained in the application

protocol data unit (APDU) part of the RSE command is transferred to ICC I/F to access the ICC. The

second type is Bridge-2 in which an RSE command sent from the RSU is transformed to ICC access

command and transferred to ICC I/F to access the ICC.
© ISO 2017 – All rights reserved 1
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SIST EN ISO 25110:2018
ISO 25110:2017(E)

Bridge-1 corresponds to the transparent type and the buffering type defined in this document, whereas

Bridge-2 corresponds to the cashing type.
OBU application
RSE
ICC OS/
bridge -2
application
application
Application interface
bridge -1
Application interface
Application interface
Scope of this
document
ICC I/F
DSRC DSRC ICC I/F

Figure 4 — Application interfaces of RSE, OBU and ISS and the scope of this document

2 Normative references

The following documents are referred to in the text in such a way that some or all of their content

constitutes requirements of this document. For dated references, only the edition cited applies. For

undated references, the latest edition of the referenced document (including any amendments) applies.

ISO 14906, Electronic fee collection — Application interface definition for dedicated short-range

communication

ISO 15628, Intelligent transport systems — Dedicated short range communication (DSRC) — DSRC

application layer
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.

ISO and IEC maintain terminological databases for use in standardization at the following addresses:

— IEC Electropedia: available at http://www.electropedia.org/
— ISO Online browsing platform: available at http://www.iso.org/obp
3.1
access credentials

trusted attestation or secure module that establishes the claimed identity of an object or application

Note 1 to entry: The access credentials carry information needed to fulfil access conditions in order to perform

the operation on the addressed element in the OBE (3.10). The access credentials can carry passwords as well as

cryptographic-based information such as authenticators (3.3).
[SOURCE: EN 15509:2014, 3.1]
3.2
attribute

addressable package of data consisting of a single data element or structured sequences of data

elements
[SOURCE: ISO 17575-1:2016, 3.2]
2 © ISO 2017 – All rights reserved
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SIST EN ISO 25110:2018
ISO 25110:2017(E)
3.3
authenticator
data, possibly encrypted, that is used for authentication
[SOURCE: EN 15509:2014, 3.3]
3.4
channel
information transfer path
[SOURCE: ISO 7498-2:1989, 3.3.13]
3.5
cryptography

principles, means and methods for the transformation of data in order to hide its information content,

prevent its undetected modification or prevent its unauthorized use
[SOURCE: EN 15509:2014, 3.6]
3.6
data group
class of closely related attributes (3.2)
[SOURCE: ISO 17575-1:2016, 3.10]
3.7
data integrity

property in which data has not been altered or destroyed in an unauthorized manner

[SOURCE: ISO 14906:2011, 3.10 — modified]
3.8
Element

directory containing application information in the form of attributes (3.2)

[SOURCE: ISO 14906:2011, 3.11]
3.9
issuer
entity responsible for issuing the payment means to the user
[SOURCE: ISO/TS 16785:2014, 3.9]
3.10
on-board equipment
OBE

all required equipment on-board a vehicle for performing required EFC functions and communication

services
3.11
on-board unit

single electronic unit on-board a vehicle for performing specific EFC functions and for communication

with external systems
3.12
roadside equipment
equipment located along the road, either fixed or mobile
© ISO 2017 – All rights reserved 3
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SIST EN ISO 25110:2018
ISO 25110:2017(E)
3.13
secure application module
SAM
physical module that securely executes cryptographic functions and stores keys
[SOURCE: ISO/TS 19299:2015, 3.35]
3.14
service primitive

elementary communication service provided by the application layer protocol to the

application processes
[SOURCE: ISO 14906:2011, 3.18]
3.15
transaction

whole of the exchange of information between two physically separated communication facilities

[SOURCE: ISO 17575-1:2016, 3.21]
3.16
transaction model

functional model describing the general structure of electronic payment fee collection transactions

[SOURCE: ISO 14906:2011, 3.25]
3.17
transport service provider
entity providing a transport-related service, such as provision of roads
4 Abbreviated terms

For the purposes of this document, the following abbreviated terms apply unless otherwise specified.

AID Application Identifier
APDU Application Protocol Data Unit
ASN.1 Abstract Syntax Notation One (see ISO/IEC 8824-1)
ATR Answer to Reset
ATS Answer to Select
BST Beacon Service Table
DSRC Dedicated Short-Range Communication
EAL Evaluation Assurance Level
EFC Electronic Fee Collection
EID Element Identifier
ERP Electronic Road Pricing
EVENT-RT EVENT-Report (see ISO 15628)
MAC Medium Access Control
4 © ISO 2017 – All rights reserved
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SIST EN ISO 25110:2018
ISO 25110:2017(E)
ICC Integrated Circuit(s) Card (IC card)
IFMS Interoperable Fare Management System
OBE On-Board Equipment
5 Data transfer models
5.1 General

There are three types of data transfer models for on-board accounts using the ICC to cope with the

operational requirements described in Annex A.
5.1.1 Transparent type

The ICC command data are transferred directly from the RSE to the ICC through the OBU. The OBU

temporarily stores the ICC command data and response data in the buffer memory. See Figure 5.

OBU
command
command
CPU
RSE
ICC
response
response
Figure 5 — Generic structure of transparent type
5.1.2 Caching type

The EFC-related data are read out from the ICC at the presentation and stored in the SAM of the OBU. In

the DSRC communication, the EFC-related data in the SAM is transferred to the RSE. See Figure 6.

OBU
command
RSE
CPU SAM
ICC
response
Figure 6 — Generic structure of caching type
5.1.3 Buffering type

The EFC-related data which is limited to non-sensitive data are read from the ICC at the presentation

and stored in the buffer memory in the OBU. In the DSRC communication, the EFC-related data in the

buffer memory is transferred to the RSE. See Figure 7.
© ISO 2017 – All rights reserved 5
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SIST EN ISO 25110:2018
ISO 25110:2017(E)
OBU
command
command
RSE
CPU
ICC
response
response
Buffer
memory
Figure 7 — Generic structure of buffering type
5.2 Symbols

In the data transfer mechanism of each model, the symbols given in Figure 8 are applied.

[Symbols]
ICC command
Data set
Debit command
Value data
Figure 8 — Definition of symbols
5.3 Transparent type
5.3.1 General

In this model, the maximum vehicle speed depends on the data transfer rate between the ICC and OBU

so that the vehicle has to stop or go through slowly under an RSE antenna in case a conventional contact

ICC is used. The feature of the transparent type is to make the OBU simple by eliminating the secure

memory inside of the OBU and the performance will be improved according to the developing ICC with

high transfer data rate.
5.3.2 Data transfer process

In this model, data exchanges between the RSE and ICC are processed directly after establishing DSRC

communication and authentication between the RSE and OBU is completed. Mutual authentication

between the ICC and RSE is processed directly before the application data are exchanged and value

data are accessed.

In the reading sequence, the READ command is sent from the RSE to the ICC through the OBU to read

out the data set stored in the ICC. In the READ response, the data set stored in the ICC is transferred

from the ICC to the RSE through the OBU. In the writing sequence, the same procedure is processed. In

case of prepaid payment, the debit command is sent from the RSE and the same procedure is processed,

as shown in Figure 9.
6 © ISO 2017 – All rights reserved
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SIST EN ISO 25110:2018
ISO 25110:2017(E)
Secure DSRC
ICC
(encryption, etc.)
presentation
OBU
ICC
RSE
Initialization
Authentication
Vehicle
travel
EFC Read command
application
Read data
Debit command and data
Write command and data
NOTE Debit command is used in case of prepaid payment.
Figure 9 — Data transfer process of transparent type
5.4 Caching type
5.4.1 General

In this model, the OBU reads out datasets from the ICC and stores them in a secure memory inside the

OBU, upon insertion and completion of the authentication. The feature of this type is that the high data

exchange rate between the RSE and OBU is performed even when the ICC with slow data rate is used.

With this caching type, maximum vehicle speed is enhanced up to DSRC communication performance

irrelevant to the data transfer rate of the ICC.
5.4.2
...

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