The Interface WG summarized the policies for activities geared towards internationalization of the PHS specifications. Based on these policies, three subworking groups (SWGs) were established to study PHS service definitions, network models and interface specifications for the drafting of the PHS MoU specifications, and to conduct research on overseas market trends as well as a study of documentation systems.

1. Study policies of the Interface WG

[1] Purpose

The purpose of the Interface WG activities is to establish open and common network interface specifications in order to facilitate the expansion of international applications for the PHS air interface.

[2] Scope of application

• 1) PHS (low power or microcell) mobile communication network
• 2) WLL and cooperation with the cellular mobile communication network :

[3] Issues seen arising in relation to international applications

• 1) Compatibility with existing networks in each area.
• 2) Incorporation of new functions.

[4] Principles for drafting specifications (the relationship with ITU-T)

1st principle: Should comply with the ITU-T Standard.
2nd principle: If new specifications are necessary and are not covered by the above standards, such specifications shall be newly established.

2. Situation of the study of Interface WG

(1) Past activities of each SWG

• SWG1 : Service specifications and network model
• SWG2 : CS-network specifications
• SWG3 : Overseas research (market research, documentation system) and PHS MoU documentation system

2) Studying of the drafting of specifications (all the specifications are at the level of the Interface WG specification (draft))
3) Overseas research

To collect information required for drafting the network interface specifications, questionnaires were prepared and surveys conducted in cooperation with regulators, operators and other related organizations in the relevant countries. (Survey results will be reported at a later date.)