PHS MoU Document
B-SV5.00-02-TS
Title: Public Personal Handy-Phone System : Service Specifications of
Roaming Service
Version: 02
Date: July 31, 1998
PHS MoU Classification: Unrestricted
List of contents:

1.

Genral

2.

Basic concept

3.

Definition of PHS roaming features

4.

PHS Roaming Service Specifications

5.

PHS roaming procedures

Appendix A

Number of pages: 18

PHS MoU Group
c/o Association of Radio Industries and Businesses (ARIB)
14F, Nittochi Bldg., 4-1, Kasumigaseki 1-choume, Chiyoda-ku, Tokyo 100, Japan
TEL +81-3-5510-8599 FAX +81-3-3592-1103© PHS MoU Group1998

PHS MoU Document
B-SV5.00-02-TS
VersionHistory of Revised Versions
Date
Outline01

Dec. 17, 1996

Established

02

Enhancement of roaming service by
July 31, 1998 including PHS roaming number assignment
method No. 2.

B-SV5.00-02-TS
Public Personal Handy-Phone System: Service Specifications of Roaming Service

Contents
1 General ..................................................................................................................................

1

1.1 Objective .........................................................................................................................

1

1.2 Scope of this standard .....................................................................................................

1

1.3 Definition and terminology ............................................................................................

1

2 Basic concept .........................................................................................................................

2

2.1 Roaming feature development scenario ..........................................................................

2

2.2 Summary of PHS roaming features .................................................................................

3

3 Definitions of PHS roaming features.....................................................................................

3

3.1 Roaming features.............................................................................................................

3

4 PHS Roaming Service Specifications ....................................................................................

5

4.1 Roaming Conditions ........................................................................................................

5

4.2 Security............................................................................................................................

6

4.3 PHS Roaming Service Profile .........................................................................................

6

5 PHS roaming procedures .......................................................................................................

8

5.1 Basic procedures .............................................

9

5.2 Mobility procedure ..........................................................................................................

10

5.3 PHS roaming call control procedures..............................................................................

10

5.4 PHS roaming supplementary service procedure..............................................................

11

Appendix A......................................................................................................................................

13

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1 General
1.1 Objective
This document provides the service description for Personal Handy-Phone System (PHS)roaming.
This document describes inter-network and intra-network aspects related to PHS roaming
service.
PHS roaming services are provided by the combination of appropriate network capabilities ineach visited network. Roaming services provided by one service provider may be different
from those of another service provider. Also, the provided services may be restricted by user
conditions.
1.2 Scope of this specification
Following is the scope for this specification for the PHS roaming service.
(1) To define basic PHS roaming services concerning the inter-network interface between
home and visited networks.
(2) To define basic services provided to PHS roamer in a visited network.
(3) To define limitations on supplementary services in the visited network.
1.3 Definition and terminology
The following terminology is used in this specification.
1.3.1 Authentication
Indicates network actions to verify a public PS.
1.3.2 Call
Indicates outgoing/incoming calls related to the public PS in roaming state.
1.3.3 Mobility of public PS
Indicates network capability to provide routing to the network visited by a public PS, based on
the PHS number assigned to the terminal.
1.3.4 PHS roaming
Indicates outgoing/incoming calls when the public PS moves from the subscribed network toanother network and from visited network to another visited network.
1.3.5 PHS number

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1

Indicates a number to identify the PHS service and the public PS. The PHS number has theformat CC - NDC - SN which is based on ITU-T Recommendation E.164. The NDC canidentify the PHS number. The PHS number can be used by one or more networks.
1.3.6 Location information
Indicates the information to identify the visited network, the information to route a call within
the visited network, and the information to indicate the public PS is in roaming state.
1.3.7 PHS roaming number
It is a number that the visited network assigns to the roaming public PS while it is in roam. PHS
roaming number is based on ITU-T Recommendation E.164. The PHS roaming number is set ina message sent in the forward direction to initiate seizure of an outgoing circuit• (e.g., IAM in
the case ISUP use)• when a call is routed from a home network to a visited network.
There are two case what the PHS roaming number indicates. In the case of roaming number
assignment method No.1, the PHS roaming number indicates the information to identify thevisited network. In the case of roaming number assignment method No.2, the PHS roaming
number indicates the information to identify the visited network and the roaming public PS.
Following is the ways in which the PHS roaming number is used.
In the case of roaming
number assignment method No.1, The PHS roaming number is used only to route a call tovisited network.
In the case of roaming number assignment method No. 2, The PHS roaming number is used toroute a call to a visited network and identify the roaming PHS public PS.
For roaming number assignment method No.1, the PHS number must be transferred together
with the PHS roaming number to the visited network.
1.3.8 PHS roaming service profile
Indicates the service profile required for roaming defined in correspondence with the PHS
number. It only defines information related to services provided for the public PS in roaming.
1.3.9 Home network
Indicates the network with the contract to provide PHS service.
1.3.10 Visited network
Indicates non-home network that is visited by public PS in roaming state.
2 Basic concept
2.1 Roaming feature development scenario
Though it is likely to PHS roaming service should be developed with a long-term perspective in2

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mind, pass through several phases largely influenced by changes in market needs andtechnology. The development of PHS roaming service begins with a basic PHS roaming
capability set and proceeds to a much more complex scenario. This document mainly describes
the definitions of PHS roaming features and procedures for PHS roaming based on IN CS2 in
ITU-T recommendations.
The scenario described in this document shows an efficient way to provide PHS roaming
service in a visited network. It transfers a necessary set of service profiles from the home
network to the visited network to provide roaming service in the visited network.
2.2 Summary of PHS roaming features
PHS roaming supports the features below.
2.2.1 Provided services
The services provided while the PHS is in roaming state are outgoing/incoming calls on thecircuit switched mode and providing supplementary services.
2.2.2 Roaming features
2.2.2.1 Basic service features(1) Authentication(2) PHS roaming service profile copying on the first location registration(3) PHS roaming service profile additional copying(4) Inter-network location registration(5) Location registration within visited network(6) Deletion of service profile copied at the previously visited network(7) Confirmation of home network service profile(8) Synchronization of visited network service profile(9) Call origination(10) Call termination(11) Roaming number assignment
2.2.2.2 Supplementary service features(1) Calling User Identification Presentation•(2) Calling User Identification Restriction•(3) DTMF Transmission(4) Handover(5) Subaddressing(6) User scrambling
3 Definitions of PHS roaming features
3.1 Roaming features
3.1.1 Basic service features

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Basic roaming features are indispensable to realize PHS roaming service.• Basic roaming
features allow visited networks and home networks to use the following basic services toprovide PHS roaming service.
3.1.1.1 Authentication
This feature allows a visited network to verify a public PS that has made access to the visited
network by using information copied from the home network.
3.1.1.2 PHS roaming service profile copying on the first location registration when the
public PS requires the first location registration in the visited network
This feature allows a visited network to copy service provision conditions information (PHSroaming service profile) from the home network. This information also includes authentication
information.
3.1.1.3 PHS roaming service profile additional copying
This feature allows a visited network to copy additional authentication information from home
network when the authentication information in the visited network is lacking.
3.1.1.4 Inter-network location registration
This feature allows a visited network to register the information to identify the visited network
to the home network for routing terminating call of roaming public PS to visited network. Thisfeature is used when the public PS requires the first location registration in the visited network.
This feature updates the information for terminating call routing to visited network.
3.1.1.5 Location registration within visited network
This feature allows a visited network to register the information to route a call within thevisited network at the same visited network, for routing incoming call to the roaming public PS.
3.1.1.6 Deletion of service profile copied at the previously visited network
This feature allows the home network to delete the PHS roaming service profile stored in avisited network. This procedure is carried out when the information to identify the visited
network stored in the home network is changed, such as when the public PS moves to anothervisited network or home network.
3.1.1.7 Synchronization of visited network service profile
This feature allows the home network to reflect the change of PHS roaming service profile
stored in the home network to a visited network. The reflection scheme is for further study.
3.1.1.8 originationCall origination

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This feature allows a visited network to originate a call from a roaming public PS.
3.1.1.9 terminationCall termination
This feature routes a terminating call to a visited network by pre-registered location information
stored in the home network. And it terminates the call to roaming public PS.
3.1.1.10 Roaming number assignment
This feature allows a home network to retrieve the PHS roaming number from a visited
network. This feature is executed when a call to a roaming public PS originates. In this feature,
the PHS roaming number described in 1.3.7 roaming number assignment No.2 is used.
3.1.2 Supplementary service featureThis feature allows a visited network to provide supplementary service to roaming public PS.
Following are the features available in visited networks.
3.1.2.1 Calling User Identification Presentation
This feature allows the PHS roamer to be notified of the number of the calling user.
3.1.2.2 Calling User Identification Restriction
This feature allows the PHS roamer in a visited network to restrict notification of his number tothe called user.
3.1.2.3 DTMF Transmission
This feature transmits the Dch signal from the public PS to the network, which then converts
the Dch signal to DTMF and sends it to the remote user.
3.1.2.4 HandoverThis feature performs handover for roaming public PS. This feature supports the handoverwhich is provided within a limited domain. Inter-network handover is for further study.
3.1.2.5 Subaddressing
The subaddressing supplementary service allows the called (served) user to expand his
addressing capacity beyond the one given by the ISDN number.
3.1.2.6 User scrambling
Functions to perform scramble processing of the original signals to prevent tapping.
4 PHS Roaming Service Specifications

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5

4.1 Roaming Conditions
4.1.1 Subscription
The following must be considered for PHS user roaming subscriptions.
(1) Special subscriptions may be needed for roaming.
(2) Subscriptions for roaming may change for individual networks.
(3) Subscription of transit network selection may be needed for call termination to roaming
public PS.
4.1.2 Other Conditions(1) Roaming service may be restricted by the network.
(e.g., Networks without roaming contracts)(2) Roaming service may be restricted by network state.
(e.g., Network congestion)
4.2 Security
The PHS service is expected to provide the public PS with options in various authentication
mechanisms. The same is expected when the PHS service performs authentication for the
public PS in roaming state between the home network and the visited network. However, thereis the following exception for public PS authentication when roaming service is provided.
(1) The public PS in roaming state is authenticated by the visited network, using information
copied from the home network to the visited network.
4.3 PHS Roaming Service Profile
PHS roaming service profiles contain the information for provision of PHS roaming. The
roaming service profiles must be protected against improper access.
4.3.1 Structure of PHS roaming Service Profile
Information found in the PHS roaming service profile is classified into fixed information andvariable information. PHS roaming service profile information is stored in the home network.
A subset of the information is copied to visited networks when the public PS is in roaming
state.
Fixed information cannot be changed by a visited network. But variable information can be
modified by other networks.
4.3.1.1 Fixed PHS Roaming Service Profile
Fixed PHS roaming service profile information can be classified into the following categories.
(1) Information retrievable by the visited network.
(2) Information unretrievable by the visited network.

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Following is a list of fixed retrievable information under the administration of the home
network.
(a) PHS Number(b) Basic service subscribed per PHS number basis(c) Subscribed authentication information
A copy of this information is stored in visited network when the public PS is roaming state.
Following is a list of fixed unretrievable information under the administration of the home
network.
(d) Basic service providing conditions such as outgoing call deactivation, etc.
(e) Network with roaming service subscription(f) Subscribed security option(g) Information of transit network selection (option)
4.3.1.2 Variable PHS Roaming Service Profile Modified by Other Networks
Variable information in PHS roaming service profile has to do with mobility. This variable
information may be modified by the visited network using the following procedure.
(1) Mobility procedure to modify mobility-related parameters.
Following is a mobility-related parameter that can be modified by a visited network.
(a) PHS roaming number(2) Other procedures to modify the information are for further study.
4.3.2 Access to Home Network Stored PHS Roaming Service Profile by Visited Network
Visited networks can access PHS roaming service profiles from home networks by using thefollowing procedure.
(1) PHS service profile copying on the first location registration
With this procedure, a visited network can copy the subset of the PHS roaming service profile
when the public PS requires the first location registration in the visited network.
(2) PHS roaming service profile additional copying
With this procedure, a visited network can copy the authentication information when theauthentication information in the visited network is lacking.
(3) Inter-network location registration

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7

With this procedure, a visited network can register the information to identify the visited
network with the home network, when the public PS requires the first location registration invisited network.
4.3.3 Access to Visited Network Stored PHS Roaming Service Profile by Home Network
The following procedure applies to access the PHS roaming service profile of a visited networkfrom the home network.
(1) Deletion of service profile copied at the previously visited network
With this procedure, the home network can delete the PHS roaming service profile stored in avisited network when the roaming public PS moves to other visited networks or to the home
network.
(2) Synchronization of visited network service profile
Under further study is the procedure to update a PHS roaming service profile stored in a visited
network when the PHS roaming service profile stored in the home network is changed.
4.3.4 Conditions when the copy of the PHS roaming service profile is stored in a visited
network
The PHS roaming service profile is copied from the home network to a visited network when
the public PS requires the first location registration in the visited network. And it is deleted
when the public PS leaves the visited network and requires the location registration in othernetworks. Only one copy of the PHS roaming service profile exists, except when the firstlocation registration is in progress.
In exceptional procedure state, however, two or more copies of PHS roaming service profile
may exist. If this occurs, then all copies of PHS roaming service profiles which deemed
unnecessary should be deleted by operational or management procedure.
5• PHS roaming proceduresThis section provides general descriptions for various PHS roaming procedures to support the
PHS roaming features described in Section 3 and the PHS roaming procedures from theviewpoint of the PHS roaming service providing network.
PHS roaming procedures are categorized into four different procedures.
(1) Basic procedures
Basic PHS roaming procedures are executed before other PHS roaming procedures or in
conjunction with other PHS roaming procedures. Following are basic PHS roaming procedures.
(a) Authentication(b) PHS roaming service profile copying on the first location registration

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(c) PHS roaming service profile additional copying(d) Synchronization of visited network service profile(2) Mobility procedures
Mobility procedures are PHS roaming procedures related to mobility of public PS. Mobility
procedures are registration procedures used to identify the location for call origination andtermination, and do not include an actual call origination and termination. Following are themobility procedures.
(a) Inter-network location registration(b) Location registration within visited network(c) Deletion of service profile copied at the previously visited network(3) PHS roaming call control procedures
PHS roaming call control procedures are related to actual outgoing/incoming calls. Basic
procedures and mobility procedures have to be executed before these procedures. Following are
the PHS roaming call control procedures.
(a) Call origination(b) Call termination(c) Roaming number assignment(4) Supplementary service procedures for PHS roaming(a) Calling User Identification Presentation(b) Calling User Identification Restriction(c) DTMF Transmission(d) Handover(e) Subaddressing(f) User scrambling
5.1 Basic procedures
Basic procedures are always carried out in conjunction with other PHS roaming procedures(e.g., call control or mobility).
5.1.1 Authentication
The authentication procedure may be required before, or as part of, other PHS roaming
procedures. This procedure is used to confirm the roaming public PS by using theauthentication data set copied from the home network during PHS roaming service profile
copying on the first location registration or PHS roaming service profile additional copying.
There is no interworking procedure to other networks.
5.1.2 PHS roaming service profile copying on the first location registration

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9

This procedure is used to copy the PHS roaming service profile from the home network to avisited network to check the service providing condition when the public PS requires the firstlocation registration in visited network. It also contains authentication-related information
which the visited network uses to verify public PS.
5.1.3 PHS roaming service profile additional copying
A visited network can make additional copies of a PHS roaming service profile in order toverify a public PS by using this procedure.
5.1.4 Synchronization of visited network service profile
Under further study is how the PHS roaming profile in a visited network should be modified if
the PHS roaming service profile in the home network is changed.
5.2 Mobility procedure
The mobility procedure is a PHS roaming procedure related to public PS mobility across the
PHS network and enables call origination and termination when the public PS is in roaming
state. The mobility procedure does not include actual outgoing/incoming calls.
5.2.1• Inter-network location registration
This procedure provides registration of the information indicating where to allow PHS roaming
termination at the home network from a visited network.
PHS roaming service profile copying on the first location registration and authentication
procedures have to be done successfully before this procedure.
5.2.2 Location registration within a visited network
This procedure provides registration of public PS the information to route a call within visited
network at the same visited network, for routing incoming call to the roaming public PS. The
roaming public PS initiates this procedure. This procedure is carried out only when the PHS
service profile is copied, before the public PS require location registration in a visited network.
The authentication of the basic process must be completed before this procedure.
5.2.3 Deletion of service profile copied at the previously visited network
The deletion of service profile copied at the previously visited network procedure deletes the
PHS roaming service profile which is transferred from the home network to a visited network.
5.3 PHS roaming call control procedures
PHS roaming call control procedures are related to call origination and termination.
5.3.1 Call origination10

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This procedure is executed by a visited network based on the information received from thehome network, and is used to originate a call from a roaming public PS.
PHS roaming service profile copying on the first location registration and inter-network
location registration procedures have to be done successfully before this procedure. Internetwork related procedures do not exist in this procedure.
A call can not be made if a PHS roaming service profile is not copied to a visited network.
5.3.2 Call termination
This procedure is executed by a visited network based on the information received from thehome network, and is used to terminate a call to a roaming public PS. When the transit network
selection option is applied, the home network shall connect to the visited network through theselected transit networks. PHS roaming service profile copying on the first location registrationand inter-network location registration procedures have to be done successfully before thisprocedure.
Calls are routed to the home network first, then to the visited network, and are finallyterminated to the public PS in roaming. Re-direction is possible if home and originate networks
have the capabilities. When it routes a call to a visited network, a message sent in the forward
direction to initiate seizure of an outgoing circuit• (e.g., IAM in the case ISUP use) should
include information to route the call to visited network and identify the roaming public PS in
the visited network. There are two cases for sending above two pieces of information. In thecase of roaming number assignment method No.1, the PHS roaming number is used for theformer information and the PHS number is used for the latter information. In this case, internetwork related procedures do not exist. In the case of roaming number assignment method
No.2, the PHS roaming number should include both pieces of information. In this case, internetwork query for the PHS roaming number to a visited network, that is roaming number
assignment procedure, exists call by call.
If the PHS roaming service profile is not copied in the visited network, the network disconnects
the call without termination.
5.3.2.1 Roaming number assignment
The home network obtains the PHS roaming number, that includes both information to routethe call to visited network and identify the roaming public PS in the visited network, from thevisited network using this procedure. This procedure is initiated by the home network when acall to the roaming public PS is routed to the home network. This procedure is performed onlyin the case of roaming number assignment method No.2.
5.4 PHS roaming supplementary service procedure
5.4.1 Calling User Identification Presentation
This feature allows the PHS roamer in the visited network to be notified of the numbers ofcalling user. The ability to transfer the calling number is necessary for transit networks that

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11

relay the call. The provision condition of this service in a visited network depends on the resultof an agreement between the home network and a visited network. The detailed information is
described in an APPENDIX A.
5.4.2 Calling User Identification Restriction
This feature allows the PHS roamer in a visited network to restrict notification of his number tothe called user. The provision condition of this service in a visited network depends on the
result of an agreement between the home network and a visited network. The detailed
information is described in an APPENDIX A.
5.4.3 DTMF Transmission
This feature transmits the Dch signal from the public PS to the network, which then converts
the Dch signal to DTMF and sends it to the remote user.
5.4.4 HandoverThis procedure is used for the public PS in roaming state to perform handover within a visited
network. Handover should be provided under the following conditions.
(1) Handover is provided within a limited domain.
(2) The number of handover executions depends on the number of sets of authentic
information.
Originating or terminating procedures have to be finished successfully. Inter-network related
procedures do not exist in this procedure.
5.4.5 Subaddressing
This feature allows the terminator in a visited network to expand his address number. The
ability to transfer the subaddressing is necessary for networks that relay the call. The provisioncondition of this service in a visited network depends on the result of an agreement between thehome network and a visited network. The detailed information is described in an APPENDIX
A.
5.4.6 User scrambling
This feature provides simple scrambling between the public PS and the cell station in a visited
network.

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Appendix A
Supplementary Service Providing Conditions for a PHS Roamer
1. Introduction
This Appendix A illustrates the combination patterns of the service providing conditions for avisited network user and a home network user when Calling User Identification Presentation(CUIP), Calling User Identification Restriction (CUIR) , Subaddressing are provided and show
several points to consider in supplementary services provision for a PHS roamer.
2. Supplementary Service Providing Conditions for a User
Table A-1/B-SV5.00 shows the MoU Service Description of the service providing conditions
for a user when CUIP, CUIR, Subaddressing are provided.
Table A-1/B-SV5.00 Supplementary Service Providing Conditions

CUIP

CUIR

CUIR

CUIP is a supplementary service to the called user which provides the callinguser's PHS-number, possibly with subaddressing information, to the calleduser.
CUIP may be provided on a subscription basis or be generally available.

CUIR is a supplementary service offerd to the calling party to restrict
presentation of the calling user's PHS-number and subaddress to the calleduser.
CUIR can be provided on a subscription bases or be generally available.
As a network provider option, CUIR can be offered with several subscription
options.
The options apply separately to each PHS number. Subscription options are
summarized below:

CUIR is a supplementary service offered to the calling party to restrict
presentation of the calling user's PHS-number and subaddressing to the calleduser.
CUIR can be provided on a subscription bases or be generally available.
As a network provider option, CUIR can be offered with several subscription
options.
The options apply separately to each PHS number. Subscription options are
summarized below:
Subscription option
CUIR mode
Default(only for temporary mode)

ValuesPermanent(active for all calls)
Temporary(specified by user per call)
Presentation restricted
Presentation not restricted

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13

For calling user, provision shall be without any prior arrangement with the
Subaddressing service provider.
For the called user, provision may be general without any prior arrangement
or by prior arrangement with the service provider.

3. Supplementary Service Providing Conditions for a PHS Roamer
Supplementary service providing conditions in roaming state depends on the providing
conditions both in the home network and in the visited network. The combination patterns
where the service class or the service attribute is different in roaming state are extracted andseveral points to consider are shown.
3.1 Calling User Identification Presentation (CUIP)
Service providing conditions for a PHS roamer can be classified into four categories as shownin Table A-2/B-SV5.00 dependent on providing conditions for CUIP.
Table A-2/B-SV5.00 CUIP Provision
Category

Network
Capability

Contract
Requirement

I

Serviceprovision iscapableNo contract isrequiredContractwith network

Service Provision
Network

Called public PS

Network
Contract isrequiredII

Yes
Called public PS

NetworkIII

No
Called public PS

IV

Serviceprovision isincapable

Network

Called public PS

CUIP Providing Conditions for a PHS roamer can be classified into 16 patterns as shown in
Table A-3/B-SV5.00 dependent on the combination of 4 categories each in the home network
and in the visited network.

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Table A-3/B-SV5.00 CUIP providing conditions pattern
VisitedNetworkHome
Network

I
I

Category*1Category

*1

II

III

IV

*2

II
III

*2

*1

Same service class for a PHS
roamer in the home network
and in the visited*2
Different service class for a
PHS roamer in the home
network and in the visitedIV

In the pattern of different service class for a PHS roamer in the visited network and in the home
network, special consideration may be needed.
Consideration(1)Notification of the service class difference to a PHS roamer.
(2)Previous contract between the home network and the visited network to avoid service classdifference.
3.2 Calling User Identification Restriction (CUIR)
Service providing conditions for a PHS roamer can be classified into four categories as shownin Table A-4/B-SV5.00 dependent on providing conditions for CUIR.

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15

Table A-4/B-SV5.00 CUIR provision

Category

Network
Capability

I

Serviceprovision iscapableContract
Requirement

Contractwith network

Service Provision
Network

No contract isrequiredCalling public PS

Network
Contract isrequiredII

Yes
Calling public PS or Calling public PS

NetworkIII

No
Calling public PS

Network

Serviceprovision isincapable

IV

Calling public PS

CUIR Providing Conditions for a PHS roamer can be classified into 16 patterns as shown in
Table A-5/B-SV5.00 dependent on the combination of 4 categories each in the home network
and in the visited network.
Table A-5/B-SV5.00 CUIR providing conditions pattern
VisitedNetworkHome
Network

Ir
Category*1Category

I

II

*1

*3

III
*2

Same service class for aroamer in the home network
and in the visited network.

IV*2

Different service class for aroamer in the home network
and in the visited network.

II
III

*2

IV

*1
*3
Different service class for aroamer in the home network
and in the visited network
dependent on thesubscription mode and thedefault value.

In the pattern of different service class for a PHS roamer in the visited network and in the home
network, special consideration may be needed.

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Consideration(1)Notification of the service class difference to a PHS roamer.
(2)Previous contract between the home network and the visited network to avoid service classdifference.
3.3•Subaddressing
A Calling user requires no contracts for this service provision. Service providing conditions for
a PHS roamer can be classified into four categories as shown in Table A-6/B-SV5.00
dependent on providing conditions for a called user.
Table A-6/B-SV5.00 Subaddressing Provision

Category

Network
Capability

I

Serviceprovision iscapableContract
Requirement

Contractwith network

Service Provision
Network

No contract isrequiredCalled public PS

Network
Contract isrequiredII

Yes
Called public PS

NetworkIII

No
Called public PS

NetworkIV

Serviceprovision isincapable

Called public PS

Subaddressing Providing Conditions for a PHS roamer can be classified into 16 patterns asshown in Table A-7/B-SV5.00 dependent on the combination of 4 categories each in the home
network and in the visited network.

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Table A-7/B-SV5.00 Subaddressing providing conditions pattern
VisitedNetworkHome
Network

I
I

Category*1Category

*1

II

III
*2

*2
Different service class for aroamer in the home network
and in the visited network.

II
III

IV

Same service class for aroamer in the home network
and in the visited network.

*2

*1

IV

In the pattern of different service class for a PHS roamer in the visited network and in the home
network, special consideration may be needed.
Consideration(1)Notification of the service class difference to a PHS roamer.
(2)Previous contract between the home network and the visited network to avoid service classdifference.

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