PHS MoU Document
B-IF2.00-03-TS
Title: Public Personal Handy-Phone System : General Description ofInterface Specifications between Public Cell Station and ISDNbased PHS Switching Center
Version: 03
Date: July 31, 1998
PHS MoU Classification: Unrestricted
List of contents:

1. General
2. Principles
3. Network Model and Reference Points
4. PHS service procedure
5. 32 kbits/s unrestricted digital
6. Others

Number of pages: 11

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-IF2.00-03-TS
Version01

History of Revised Versions
DateOutline
April 17, 1996 Establishedx Document No. is changed. (Formerly IF2.00)
x Document title is changed. (Formerly General
Description of Personal Handy-Phone System
Public Cell Station-ISDN Interface

01

Dec. 17, 1996

02

April 21,
1997

03

July 31, 1998 x Adding of description of CS Type 2 anderror correction.

Sub clause 3.3 is added.

B-IF2.00-03-TS

Public Personal Handy-Phone System:
General Description of Interface Specifications between Public
Cell Station and ISDN-based PHS Switching CenterContents

1. General.................................................................................................................................................

12. Principles .............................................................................................................................................

1

3. Network Model and Reference Points.................................................................................................

2

3.1 Basic Rate Interface ....................................................................................................................

3

3.2 Primary Rate Interface ................................................................................................................

5

3.3 IF2 combined with V5 Interface .................................................................................................

7

4. PHS service procedure.........................................................................................................................

8

5. 32kbit/s unrestricted digital .................................................................................................................

8

6. Others...................................................................................................................................................

8Appendix A...............................................................................................................................................

9

A.1 Message sequence examples .......................................................................................................

9

A.1.1. Outgoing Call (included Disconnect Sequence) .................................................................

9A.1.2. Incoming Call......................................................................................................................

10

A.1.3. Location Registration..........................................................................................................

10

A.1.4. Handover.............................................................................................................................

11B-IF2.00-03-TSi1. General
This chapter describes the general information and principles about B-IF2.0x series Interface
specifications of Personal Handy -Phone System. The current B-IF2.0x series interface specifications
are constructed with follows.
B-IF2.00 : Public Personal Handy-Phone System: General Description of Interface Specifications
between Public Cell Station and ISDN-based PHS Switching Center
This document include the general information and the common principles of B-IF2.0x
series.
B-IF2.01 : PHS Service Control ProceduresThis document is based on ITU-T Recommendation Q.932.
B-IF2.02 : Layer 3 specification
This document is based on ITU-T Recommendation Q.931.
B-IF2.03 : Layer 2 specification
This document is based on ITU-T Recommendation Q.921.
B-IF2.04 : Layer 1 specification of Basic Rate Interface
This document is based on ITU-T Recommendation I.430.
B-IF2.05 : Layer 1 specification of Primary Rate Interface
This document is based on ITU-T Recommendation I.431.
B-IF2.06: Digital Transmission System on Metallic Local Line for ISDN Basic RateAccessThis document is based on ITU-T Recommendation G.961.
2. Principles
All of B-IF 2.0x PHS interface specification documents have following principles.
i)
ii)
iii)
iv)
v)
vi)

Interface specification allows to connect the Multi-vendor's CS to same SW.
Interface specification allows to connect the Multi-operator's SW to same CS.
Interface specification allows to use same CS in any PHS networks.
Interface specification allows to use same SW in any PHS networks.
Interface specification allows to evolve CS and SW separately.
B-IF 2.0x PHS Interface specifications allow to support all PHS services.

B-IF2.00-03-TS

1

3. Network Model and Reference Points
Network Model and Reference Points of IF2 which uses ISDN interfaces is based on ITU-T
Recommendation I.411 and G.960. Figure 1-1/B-IF0.00 shows this Network Model and Reference
Points, referring the ITU-T Recommendations. In IF2 of this documents(B-IF2.0x series), "T"
reference point indicates the interface between CS and DSU, "U" reference point (BRI only), is called"transmission line" in ITU-T Recommendation G.960, indicates the interface between DSU and ISDN
Switch (LT).
STransmission line

TTE1TE2NT1VLTET(Reference configurations for ISDN user-network interface defined in ITU-T
Recommendation I.411, G.960)

Transmission line
TCS

CS1UDSUTransmission line
UAggregate
TCS2

ISDN SwitchDSU¥¥¥

CSControlCSn(Physical configuration for IF2 interface)
Reference point
NT1 Network termination 1 defined in Recomendation ITU-T I.411
NT2 Network termination 2 defined in Recomendation ITU-T I.411
TE Terminal equipment defined in Recomendation ITU-T I.411
LT Line termination defined in Recomendation ITU-T G.960
ET Exchange termination

Figure 3-1/B-IF2.00 IF2 Network Model and Reference Points

2B-IF2.00-03-TS

3.1 Protocol Architecture Model on IF2 Basic Rate Interface
The concepts, terminology, overview and description, of IF2 layer 1, 2 and 3, are conformed to ITU-T
Recommendations. The other issues also meet to ITU-T Recommendations. Layer 1 is specified basedon ITU-T Recommendation I.430 in B-IF2.04 and G.961 in B-IF2.06 PHS interface specification
document. Layer 2 is based on ITU-T Recommendation Q.921 in B-IF2.03 PHS interface
specification document. Layer 3 is based on ITU-T Recommendation Q.931 and Q.932, and Layer 3 isspecified in more detail to implement the PHS specific functions in B-IF2.02 and B-IF2.01 PHSinterface specification document. This layer 3 descriptions is in help for operator more easily toimplement the PHS services. These Layer specifications describe the PHS service control procedures
between PHS public cell station and ISDN.
Figure 3-2 shows the Protocol Architecture Model on IF2 which uses ISDN basic rate interfaces.
IF1IF2

UmPSTUCS

ISDN
SwitchDSU

Layer3IF2.01(ITU-T Q.932)
IF2.02(ITU-T Q.931)

IF2.01(ITU-T Q.932)
IF2.02(ITU-T Q.931)

Layer2IF2.03(ITU-T Q.921)

IF2.03(ITU-T Q.921)

Layer1IF2.04(ITU-T I.430)

IF2.04IF2.06(ITU-T I.430) (ITU-T G.961)

IF2.06(ITU-T G.961)

Um,T,U:Reference point

Figure 3-2/B-IF2.00 Protocol Stack of BRI

B-IF2.00-03-TS

3

The specification of ITU-T Recommendation I.411 is modified the one point that PHS be able to use a
D-channel commonly, at multi-BRI connected environment. This environment and the modification
are indicated in Figure 3-3. Figure 3-3 is the example of three BRIs connected environment and upper
D-channel is used commonly for three BRIs. Maximum number of BRI for single D-channel needs tobe specified. It is suggested to be eight.

B
2 x B channel
B
USING

2 x B channel

D

B
B

NOT USE

2 xB

BR I
InterfaceDB
B

NOT USE

BR I
Interface

BR I

DFigure 3-3/B-IF2.00 D-channel usage at multi-BRI connected environment

4B-IF2.00-03-TS3.2. Protocol Architecture Model on IF2 Primary Rate InterfaceThe concepts, terminology, overview and description, of IF2 layer 1, 2 and 3, are conformed to ITU-TRecommendations. The other issues also meet to ITU-T Recommendations. Layer 1 is specified basedon ITU-T Recommendation I.431 in B-IF2.05 PHS interface specification document. Layer 2 is basedon ITU-T Recommendation Q.921 in B-IF2.03 PHS interface specification document. Layer 3 isbased on ITU-T Recommendation Q.931 and Q.932, and Layer 3 is specified in more detail toimplement the PHS specific functions in B-IF2.02 and B-IF2.01 PHS interface specification
document. This layer 3 description is in help for operator more easily to implement the PHS services.
These Layer specifications describe the PHS service control procedures between PHS public cellstation and ISDN.
Figure 3-4 shows the Protocol Architecture Model on IF2 which uses ISDN primary rate interfaces.
IF1

IF2

UmT
CSPS

Layer3Layer2

Layer1IF1.00

IF1.00

UISDN
SwitchDSU

IF2.01(ITU-T Q.9 32)
IF2.02(ITU-T Q.931)

IF2.01(ITU-T Q.932)
IF2.02(ITU-T Q.931)

IF2.03(ITU-T Q.921)IF2.03(ITU-T Q.921)

IF2.05(ITU-T I.431)

IF2.05(ITUT I.431)

see Note

see Note

Um,T,U:Reference point
Note: "U" referent point interface is decided from the specification of each country and/or each region

Figure 3-4/B-IF2.00 Protocol Stack of PRI
The usage of multi-PRI connected environment is based on ITU-T Recommendation I.411. This
environment is indicated in Figure 3-5 and Figure 3.6. Figure 3-5 is the example of two PRIs
connected environment and upper D-channel is used commonly for two PRIs. Figure 3-6 is theexample of BRI and PRI connected environment and upper D-channel is used commonly for twointerfaces. Maximum number of PRI for single D-channel needs to be specified. It will be set for
further study.

B-IF2.00-03-TS

5

B
23xB channel
PRI
Interface
B
USING

D

B
24xB channel

PRI
Interface
B
B

Figure 3-5/B-IF2.00 D-channel usage at multi-PRI connected environment

2xB channel

B
B

USING

BRI
InterfaceDB
PRI
Interface

24xB channel
B
B

Figure 3-6/B-IF2.00 D-channel usage at BRI and PRI connected environment

6B-IF2.00-03-TS3.3 IF2 combined with V5 Interface
V5 interface specified in ITU-T Recommendation Q.964 (V5.1) can be applied on the point between
CS and Local Exchange (public PHS network).
Figure 3-X/B-IF2.00 shows the protocol architecture model on IF2 with V5 interface. Layer 1 toLayer 3 on V5 point between Access Network (AN) and Local Exchange Adapter (LEA) are specified
based on ITU-T Recommendation Q.964. As for T and/or U reference point between CS and AN,Layer 1 is based on ITU-T Recommendation I.430 in B-IF2.04 document, Layer 2 is based on ITU-T
Recommendation Q.921 in B-IF2.03 document, Layer3 is based on ITU-T Recommendation Q.931
and Q.932 in B-IF2.02 and B-IF2.01 document. The same specification is applied on T and/or U
reference point between LEA and LE as what is applied on the point between CS and AN.
Layer 2 and Layer 3 information from/to CS is carried transparently to/from LE through AN, V5 pointand LEA by using LAPV5-EF. Layer 2 (LAPV5-DL) and Layer 3 on AN and/or LEA are used onlyfor control of user ports.
T and/or UV5CS

B-IF
2.01
B-IF
2.02

Layer1

B-IF1.0X

Layer3Layer2AN

T and/or ULELEA

ContorolContorol

LAPV5-DLLAPV5-DL

B-IF2.01(Q.932)
B-IF2.02(Q-931)B-IF
2.03(Q.921)

B-IF2.03(Q.921)
Frame
Relay

LAPV5-EF

LAPV5-EF

Frame
Relay

B-IF
2.04

ITU-T
G.703-6

ITU-T
G.703-6

B-IF
2.04
and/or
2.05

B-IF2.04
and/or
B-IF2.05

Figure 3-X/B-IF2.00 Protocol Architecture Model on IF2 with V5 Interface

B-IF2.00-03-TS

7

4. PHS service procedure
PHS service procedures is based on ITU-T Recommendation Q.932 in B-IF2.01 PHS interface
specification document. These procedures are described more real to meet PHS service procedures areas follows:i)ii)iii)
iv)

Handover procedure
DTMF signal transmission procedure
Authentication procedure
Location Registration procedure

This specification have capability of the expansion that an operator be able to develop the own uniqueservice procedure use this specification. Message sequence examples are in Appendix A of thisdocument.
If you need more general information about PHS service, you have to read Svx.xx documents.
5. 32kbit/s unrestricted digital"32kbit/s unrestricted digital" means that a digital communication is implemented instead of ADPCM
information on PHS 32kbit/s traffic channel of PHS common air interface. The one of the implement
methods is described on JT-Q931 (Draft) of TTC (Telecommunication Technology Committee). PHS
system will be able to use any other methods meet with ITU-T Q.931.
6. Others
When you refer ITU-T ISDN documents, "ISDN user-network interface" is used as PHS Public Cell
Station (CS)-network interface. Please take care this word conversion principle.

8B-IF2.00-03-TS

Appendix A
A.1 Message sequence examples
This sub-clause explains typical message sequences. The message sequences are explanatory purpose
only.
This section describes the authentication procedure for CS Type 1.
The FACILITY messages used in the authentication procedure described in this section are notapplicable to CS Type 2, because the authentication is not realized using IF2 in CS Type 2.
A.1.1. Outgoing Call (included Disconnect Sequence)
PS

ISDN

CS

Off Hook
DialSetupCall Proceeding

Setup

POTS

Call Proceeding
Authentication RequestFacility(Authentication Request)

Authentication Response

Facility(Authentication Response)

Alerting

Alerting

Connect

Connect

Ringing
OffHookCommunication progress
Busy Tone
OnHookDisconnect

Disconnect

Release

Release

Release Complete

Release Complete

OnHook

B-IF2.00-03-TS

9A.1.2. Incoming CallPS

ISD N PO T S
O ffH ook

C S1 C S2 CS 3
Se tupP asging
P asging
P asging
Pa ging re sponse
S etupCa ll Pr oce eding
A uthentica tion Re quest

D ial

Ca ll Pr oce eding
F ac ility( A uthentica tio n Re quest)
F ac ility( A uthentica tio n Re sponse)

A uthentica tion Re sponse
R ing
A le rting

A ler ting

C onnec tC onne ct A cknow le dge

O ff H o ok

D ialTon

Conn e ct
C onne ct A ckno w le dge

R BT
P ola rity
Cha nge

C om m unic ation pr o gress

A.1.3. Location RegistrationPS

ISD NCS
Loc ation Registration Re questRegistration( Loca tion Registr ation Reque st)Authentica tion Request
Authentica tion Response

Fac ility(A uthe ntication Reque st)
Fac ility(A uthe ntic ation R esponse )Loc ation R egistra tion Ac knowledge

Re lease Com plete( Loca tion Re gistration Acknow le dge)10

B-IF2.00-03-TSA.1.4. Handover
PS

ISD N

CS1

Communication in progress

Communicationin progress

CS2
Setup
(Handover Request)

Setup(Handover Request)

Call Proceeding
Call Proceeding
Connect(Handover Response)

Connect(Handover Response)

Communication inprogress

Communication in progress
D isconnect(H andover D isconnect)
Release
Release Complete

B-IF2.00-03-TS

11