PHS MoU Document
B-GN0.00-01-TS
Title: Public Personal Handy-phone System : General Description
Version: 01
Date: April 21, 1997
PHS MoU Classification: Unrestricted
List of contents:
1.
2.

Introduction
Public PHS
2.1 Basic Functional Architecture
2.2 IF1: PHS Common Air Interface
2.3 IF2: Public CS-Network Interface
2.4 IF3: Network-Network Interface For Call Control
2.5 IF4: Network-Network Interface for SCP Exchange
3. Service Aspects
4. System Aspects
ABBREVIATIONS

Number of pages: 7

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 Group1997

PHS MoU Document
B-GN0.00-01-TS
Version01

History of Revised Versions
DateOutline
April 21, 1997 EstablishedB-GN0.00-01-TS
Public Personal Handy-phone System: General Description

Contents

1. Introduction ....................................................................................................................................... 1
2. Public PHS......................................................................................................................................... 1
2.1 Basic Functional Architecture .................................................................................................... 2
2.2 IF1: PHS Common Air Interface ................................................................................................ 2
2.3 IF2: Public CS - Network Interface ............................................................................................ 2
2.4 IF3: Network - Network Interface for Call Control ................................................................... 3
2.5 IF4: Network - Network Interface for SCP Exchange................................................................... 3
3. Service Aspects ............................................................................................................................... 3
4. System Aspects.................................................................................................................................. 3
ABBREVIATIONS .............................................................................................................................. 7
This document describes general view of Public Personal Handy-phone System.

B-GN0.00-00-TSi1. Introduction
PHS (Personal Handy-phone System) is a new concept of communication system that provides aneconomical wireless access services based on the concept of “anytime and anywhere” for personalcommunications. Various applications are taken into consideration in its technical standards, such as
Public Digital Cordless Telephone, Wireless Local Loop, PBX (Private Branch eXchange) Cordless,Home Cordless and Transceiver. This document describes Public Digital Cordless Telephone, i.e.,
Public PHS.
Public PHS is designed to realize the concept of Public Digital Cordless Telephone, such as highquality two way communications, wireless multimedia communications, terminal mobility andalternative access method to networks, e.g., PSTN (Public Switched Telephone Network)/ISDN(Integrated Services Digital Network) and PLMN (Public Land Mobile Network).
2. Public PHS
The configuration of basic public PHS network is shown in Figure 2-1/B-GN0.00. The basic public
PHS network consists of PS (Personal Station), Public CS (Cell Station), PSC (PHS SwitchingCenter) and SCP (Service Control Point). The basic functions of PHS network are CCF (Call ControlFunction), SSF (Service Switching Function), SCF (Service Control Function) and SDF (Service DataFunction). The air interface between PSs and Public CSs is standardized as RCR STD-28 of ARIB
(Association of Radio Industries and Business).

PHS network
SCPPSC

Cell Station

Personal station

Personal station

Figure2-1/B-GN0.00 Basic Public PHS network

B-GN0.00-01-TS1

2.1 Basic Functional Architecture
The four interface reference points for the public PHS network (IF1•4) are shown in Figure 2-2/BGN0.00. Definitions of these interface reference points are as follows.
(i) IF1 is the PHS Common Air Interface.
(ii) IF2 is the Public CS - Network Interface.
(iii) IF3 is the Network - Network Interface for CC (Call Control).
(iv) IF4 is the Network - Network Interface for SCP (Service Control Point) Exchange. Thisinterface is used for roaming procedure.

PHS network

Another network *1

IFSCPPSC
IF3IF2Cell Station
IF1*1 : PSTN/ISDN,PLMN, PHS
Personal station

Figure2-2/B-GN0.00 Interface Reference Points

2.2 IF1 : PHS Common Air Interface
The PHS Common Air Interface is a radio interface between PS and Public CS. The specifications aredescribed in B-IF1.xx series, which are based on RCR STD-28.

2.3 IF2 : Public CS - Network Interface
IF2 is the reference point of interface between Public CS and CCF in PHS switching network. The
specifications are described in B-IF2.xx series.

2B-GN0.00-01-TS

2.4 IF3 : Network - Network Interface for Call Control
IF3 is the reference point of the CCF-CCF interface between Networks. ISUP (ISDN User Part) ofSignaling System No.7 is used. The specifications are described in B-IF0.xx and B-IF3.xx series.
2.5 IF4 : Network - Network Interface for SCP Exchange
IF4 is the reference point of the SDF-SDF interface between Networks. INAP (Intelligent Network
Application Protocol) of Signaling System No.7 is used. The specifications are described in B-IF0.xx
and B-IF4.xx series.

3. Service Aspects
The specifications for Public PHS services, described in B-SVx.xx series, are summarized in thissection.
A Public PHS subscriber can communicate with not only Public PHS subscribers, but also otherPSTN/ISDN/PLMN subscribers. Every Public PHS subscriber is assigned a unique identification
number. The numbering plan should follow ITU-T Recommendation E.164 in order to enable thePublic PHS subscriber to interconnect with PSTNs/ISDNs/PLMNs, whose domestic numbering plans
depend on each administration.
Bearer services provided by Public PHS are speech, 3.1kHz audio and unrestricted digital.
Teleservices provided by Public PHS are put for further study.
In addition to the basic services, various supplementary services would be provided in Public PHS. A
Public PHS subscriber may need pre-arranged subscription to the Public PHS service provider for thesupplementary services.
Public PHS supports roaming, such as a Public PHS subscriber moving around in areas where Public
PHSs are available. A Public PHS subscriber may need pre-arranged subscription to the Public PHS
service provider for the roaming services.
4. System Aspects
The Public PHS system configurations, described in B-NWx.xx series, are summarized in this section.
Public PHS is generally used as an access method for PSTN/ISDN. These types of network areillustrated in Figure 4-1/B-GN0.00 and Figure 4-2/B-GN0.00.
In case of the Public PHS network integrated with IN-structured PSTN/ISDN, the existing network
operators can easily construct a wireless telecommunications network by introducing Public PHS.
There are two types of interworking between PHS network and other network. One is to connect
directly, the other is to connect via transit network. The concept of interworking with other networks
is illustrated in Figure 4-3/B-GN0.00. The specifications for interworking with other networks aredescribed in B-IWx.xx series.
In order to allow a Public PHS subscriber, i.e., PS, to move around, Public PHS service providers
have to provide, so called, mobility functions such as location registration function, authentication
function, handover function and paging function.

B-GN0.00-01-TS

3

Some network elements are introduced into Public PHS network to meet the requirements mentionedabove. A network element called VLR (Visited Location Register) is introduced into Public PHS
network for providing roaming services as illustrated in Figure 4-4/B-GN0.00. When a Public PHS
subscriber roams into other network, VLR is temporarily created while the roamer stays in the visiting
network by getting the subscriber data from HLR (Home Location Register). Public PHS has adopted
CCS (Common Channel Signaling) No.7 ISUP signaling and INAP signaling. ISUP signaling follows
ITU-T Recommendations. It is also considered sufficient that INAP signaling will follow ITU-T
Recommendations.

PSTN/ISDN

SCP

PSC, PSTN/ISDN
SwitchCell station

Personal station

Telephone

Figure4-1/B-GN0.00 IN-structured PSTN/ISDN with PHS

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Existingnetwork

PSTN/ISDN
SwitchSCP

PSC

PHS localnetwork

Cell station

Telephone

Personal station

Figure4-2/B-GN0.00 Non-IN structured PSTN-ISDN

Transit network *2

PHS network

Another network *1

IFIF*1 : PSTN/ISDN, PLMN,PHS*2 : International network,
Long distance network

Personal station

Telephone

Figure4-3/B-GN0.00 Internetworking with other networks

B-GN0.00-01-TS

5

Visited network

Home network

SCP

SCP
IF

(HLR)

(VLR)

PSC

PSC

Cellstation

Cellstation

Move around

Personal station
Figure4-4/B-GN0.00 Outline of roaming

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B-GN0.00-01-TS

Personal station

ABBREVIATIONS
ARIB
CC
CCF
CCSCS
H.O.
HLR
IN
INAP
ISDNISUPITU-TLE
OSI
PBX
PHS
PLMN
PSPSC
PSTN
RPOA
SCF
SCPSDF
SSF
TTC
VLR

Association of Radio Industries and Business
Call Control
Call Control Function
Common Channel Signaling
Cell StationHandoverHome Location Register
Intelligent Network
IN Application Protocol
Integrated Services Digital Network
ISDN User Part
International Telecommunication Union - Telecommunication Standardization Sector
Local Exchange
Open Systems Interconnection
Private Branch eXchange
Personal Handy phone System
Public Land Mobile Network
Personal Station
PHS Switching Center
Public Switched Telephone Network
Recognized Private Operating Agency
Service Control Function
Service Control Point
Service Data FunctionService Switching Function
The Telecommunication Technology Committee
Visited Location Register

Note
Each group of terms written below as an example is used in this document without strict definition.
The terminology is to be discussed by the TWG (Technical Working Group) under the PHS MoUGroup.
1. Digital cordless Telephone (System)
Mobile Communication System
2. PBX WirelessWireless PBX
3. Home Cordless
Home Cordless Telephone (System)

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