The technology of PHS was developed in Japan and standardized by Japanese standards organizations. The Association of Radio Industries and Businesses (ARIB: formerly RCR) drew up a standard for the PHS Common Air Interface which was published as RCR STD-28. Meanwhile, the Telecommunication Technology Committee (TTC) has formulated standards for the PHS User-Network Interfaces and the Network-Network Interfaces based on ITU-T Recommendations.
In order that PHS be used commonly throughout the world, the Technical Working Group ("Technical WG") which was established in the PHS MoU Group, has been elaborating the PHS MoU Technical Specifications (PHS MoU TSs) based on ITU-T Recommendations, ARIB Standards and TTC Standards. These PHS MoU TSs will give solutions to a wide variety of networks and communications needs throughout the world. Up to now the Technical WG has been mainly targeting the drawing up of Technical Specifications related to Public PHS System and PHS based Wireless Local System ("PHS-WLL System"). The Technical WG has eight sub-WGs and more than a hundred experts are attending these groups from 31 organizations.

Document System of Technical Specifications

The Technical WG draws up Technical Reports (TRs) as well as Technical Specifications (TSs). Technical Specifications are documents which provide specifications. On the other hand, Technical Reports are documents which provide only technical information related to PHS.

Service (SV) series' TSs

The technical WG has already drawn up some TSs shown in the table at the bottom of this page. Among them, Service (SV) series describes the service specifications of basic services and supplementary services such as Calling User Line Identification, Call Forwarding, Barring, DTMF Transmission, Handover, Subaddress, User Scrambling and Roaming Service. In the case of B-SV5.00, it defines the following items for Roaming service:

• To define basic PHS Roaming services concerning the interwork interface between home and visited networks;
  
• To define basic services provided to PHS roamer in a visited network; and
  
• To define limitations on supplementary services in the visited network.
  

Network (NW) series' TSs

B-NW0.00 describes the network models and the network functions of the public PHS network which is based on the Intelligent network (IN) architecture. The Public PHS Network is defined as the network which supports location registration, terminal authentication and service provision for the public personal stations and includes cell stations. The functional and physical architecture of the public PHS network model according to the ITU-T Recommendations relating the IN CS-2, and the interface reference points are described in B-NW1.00.
Fig. 2

Interface (IF) series' TSs

At present, IF series mainly describes the interface between Public Cell Station (CS) and ISDN-based PHS Switching Center called IF2 whose concepts, terminology and descriptions are conformed to ITU-T Recommendations and its protocol stack is shown in Fig. 3.

IF2 layer 1 is specified based on ITU-T Recommendation I.430 in B-IF2.04 and G.961 in B-IF2.06. Layer 2 is based on Q.921 in B-IF2.03 and layer 3 is based on Q.932 and Q.931 in B-IF2.01 and B-IF2.02. B-IF2.01 specified in detail the PHS specific functions such as the Handover, Location Registration and Authentication Procedures. B-IF2.02 specifies the procedures for the establishing, maintaining and clearing of network connections in terms of messages exchanged over the D-channel of basic and primary rate interface structures.
IF1, the Air Interface between Personal Station (PS) and CS, complies with RCR STD-28.

PHS-WLL System series' TSs

PHS-WLL System is designed for plain old telephone service (POTS) and ISDN wireless access facilities, which utilizes PHS basic technology and eliminates some mobile functions.
The PHS-WLL System Model consists of WLL Access Controllers (WACs), WLL Cell Stations (WCSs), WLL Personal Stations (WPSs) and WLL Subscriber Units (WSUs). WACs are located between the Service Nodes (SNs) and function to implement concentration, authentication and so on. WIF1 is the interface between TE (Terminal Equipment) and WSU, and its interface is described in C-IF1.XX series. WIF2 is the interface between WSU/WPS and WCS and its interface complies with RCR STD-28. WIF3 is the interface between WAC and SN and its interface is described in C-IF3.XX series. The services, provisioning required in each equipment and call connection procedures are defined in C-SVX.XX and C-NWX.XX series.

Future Schedule of TSs

For Roaming service, the interface specifications of IF3, which is the interface between networks for call control, and IF4, which is the interface between networks for SCP exchange, are now under drafting based on ITU-T Recommendations such as ISUP and INAP of Signaling System No.7. The service and interface specifications of PHS User-to-User Signaling service (PHS-UUS), which is a supplementary service to send/receive a limited amount of information between PHS users, and the interface specifications of Call Forwarding service are under drafting.

Service (SV) series of Public PHS System

1. B-SV1.00-02-TSPUBLIC PERSONAL HANDY PHONE SYSTEM-SERVICE SPECIFICATIONS OF BASIC SERVICES
   
2. B-SV2.00-01-TSPUBLIC PERSONAL-HANDY PHONE SYSTEM: SERVICE SPECIFICATIONS OF CALLING USER IDENTIFICATION SERVICES
   
3. B-SV2.10-01-TSPUBLIC PERSONAL HANDY-PHONE SYSTEM: SERVICE SPECIFICATIONS OF CALL FORWARDING SERVICES
   
4. B-SV2.2O-01-TSPUBLIC PERSONAL HANDY-PHONE SYSTEM: SERVICE SPECIFICATIONS OF BARRING SERVICES
   
5. B-SV2.30-01-TSPUBLIC PERSONAL HANDY-PHONE SYSTEM: SERVICE SPECIFICATIONS OF DTMF TRANSMISSION SERVICE
   
6. B-SV2.40-01-TSPUBLIC PERSONAL HANDY-PHONE SYSTEM: SERVICE SPECIFICATIONS OF HANDOVER SERVICE
   
7. B-SV2.50-01-TSPUBLIC PERSONAL HANDY-PHONE SYSTEM: SERVICE SPECIFICATIONS OF SUBADDRESS SERVICE
   
8. B-SV2.60-01-TSPUBLIC PERSONAL HANDY-PHONE SYSTEM: SERVICE SPECIFICATIONS OF USER SCRAMBLING SERVICE
   
9. B-SV5.00-01-TSPUBLIC PERSONAL HANDY-PHONE SYSTEM: SERVICE SPECIFICATIONS OF ROAMING SERVICE
   

Network (NW) series of Public PHS System

1. B-NW0.00-02-TSPUBLIC PERSONAL HANDY-PHONE SYSTEM: GENERAL DESCRIPTION OF NETWORK AND SYSTEM CONFIGURATIONS
   
2. B-NW1.00-02-TSPUBLIC PERSONAL HANDY-PHONE SYSTEM: NETWORK AND SYSTEM CONFIGURATIONS
   

Interface (IF) series of Public PHS System

1. B-IF0.00-02-TSPUBLIC PERSONAL HANDY-PHONE SYSTEM: GENERAL DESCRIPTION OF INTERFACE SPECIFICATIONS
   
2. B-IF1.00-01-TSPUBLIC PERSONAL HANDY-PHONE SYSTEM: GENERAL DESCRIPTION OF INTERFACE SPECIFICATIONS BETWEEN PERSONAL STATION AND PUBLIC CELL STATION (COMMON AIR INTERFACE)
   
3. B-IF1.01-01-TSPUBLIC PERSONAL HANDY-PHONE SYSTEM: SPECIFICATION OF INTERFACE BETWEEN PERSONAL STATION AND PUBLIC CELL STATION (COMMON AIR INTERFACE)
   
4. B-IF2.00-01-TSPUBLIC PERSONAL HANDY PHONE SYSTEM: GENERAL DESCRIPTION OF INTERFACE SPECIFICATIONS BETWEEN PUBLIC CELL STATION AND ISDN-BASED PHS SWITCHING CENTER
   
5. B-IF2.01-01-TSPUBLIC PERSONAL HANDY-PHONE SYSTEM: INTERFACE BETWEEN PUBLIC CELL STATION AND ISDN-BASED PHS SWITCHING CENTER >PHS SERVICE CONTROL FEATURES
   
6. B-IF2.02-01-TSPUBLIC PERSONAL HANDY-PHONE SYSTEM: INTERFACE BETWEEN PUBLIC CELL STATION AND ISDN-BASED PHS SWITCHING CENTER >LAYER 3 SPECIFICATION
   
7. B-IF2.03-01-TSPUBLIC PERSONAL HANDY-PHONE SYSTEM: INTERFACE BETWEEN PUBLIC CELL STATION AND ISDN-BASED PHS SWITCHING CENTER >LAYER 2 SPECIFICATION
   
8. B-IF2.04-01-TSPUBLIC PERSONAL HANDY-PHONE SYSTEM: INTERFACE BETWEEN PUBLIC CELL STATION AND ISDN-BASED PHS SWITCHING CENTER >LAYER 1 SPECIFICATION OF BASIC RATE INTERFACE
   
9. B-IF2.05-01-TSPUBLIC PERSONAL HANDY-PHONE SYSTEM: INTERFACE BETWEEN PUBLIC CELL STATION AND ISDN-BASED PHS SWITCHING CENTER >LAYER 1 SPECIFICATION OF PRIMARY RATE INTERFACE
   
10. B-IF2.06-01-TSPUBLIC PERSONAL HANDY-PHONE SYSTEM: INTERFACE BETWEEN PUBLIC CELL STATION AND ISDN-BASED PHS SWITCHING CENTER >DIGITAL TRANSMISSION SYSTEM ON METALLIC LOCAL LINE FOR ISDN BASIC RATE ACCESS
    

PHS based Wireless Local Loop (PHS-WLL) System series

1. C-GN0.00-01-TSPERSONAL HANDY-PHONE SYSTEM WIRELESS LOCAL LOOP (PHS-WLL) SYSTEM: GENERAL DESCRIPTION
   
2. C-SV0.00-01-TSPHS-WLL SYSTEM: GENERAL DESCRIPTION OF SERVICES
   
3. C-SV1.00-01-TSPHS-WLL SYSTEM: SERVICE OF PHS-WLL SYSTEM
   
4. C-NW0.00-01-TSPHS-WLL SYSTEM: GENERAL DESCRIPTION OF NETWORK AND SYSTEM CONFIGURATION
   
5. C-NW1.00-01-TSPHS-WLL SYSTEM: SYSTEM CONFIGURATION OF PHS-WLL SYSTEM
   
6. C-IF0.00-01-TSPHS-WLL SYSTEM: GENERAL DESCRIPTION OF INTERFACE SPECIFICATIONS
   
7. C-IF1.00-01-TSPHS-WLL SYSTEM: GENERAL DESCRIPTION OF INTERFACE SPECIFICATIONS BETWEEN FIXED TERMINAL EQUIPMENT AND WIRELESS LOCAL LOOP SUBSCRIBER UNIT
   
8. C-IF1.01-01-TSPHS-WLL SYSTEM: INTERFACE SPECIFICATION BETWEEN TERMINAL EQUIPMENT AND WLL SUBSCRIBER UNIT
   
9. 00-01-TSPHS-WLL SYSTEM: GENERAL DESCRIPTION OF INTERFACE SPECIFICATIONS BETWEEN WLL SUBSCRIBER UNIT OR WLL PERSONAL STATION AND WLL CELL STATION (COMMON AIR INTERFACE)
   
10. C-IF2.01-01-TSPHS-WLL SYSTEM: INTERFACE SPECIFICATION BETWEEN WLL SUBSCRIBER UNIT OR WLL PERSONAL STATION AND WLL CELL STATION (COMMON AIR INTERFACE)>RCR STD-28 VERSION 2 APPENDIX AB
    
11. C-IF3.00-01-TSPHS-WLL SYSTEM: GENERAL DESCRIPTION OF INTERFACE SPECIFICATIONS BETWEEN WLL ACCESS CONTROLLER AND SERVICE NODE
    
12. C-IF3.01-01-TSPHS-WLL SYSTEM: INTERFACE SPECIFICATION BETWEEN WLL ACCESS CONTROLLER AND SERVICE NODE> ANALOGUE SUBSCRIBER INTERFACE
    
13. C-IF3.02-01-TSPHS-WLL SYSTEM: INTERFACE SPECIFICATION BETWEEN WLL ACCESS CONTROLLER AND SERVICE NODE>ITU-T G.964: V5.1 INTERFACE
    
14. C-IF3.03-01-TSPHS-WLL SYSTEM: INTERFACE SPECIFICATION BETWEEN WLL ACCESS CONTROLLER AND SERVICE NODE>ITU-T G.965: V5.2 INTERFACE