ARIB's Standardization Activities


Personal Handy-phone System ARIB Standard (RCR STD-28) Version 2 was approved at the Third Standard Assembly Meeting on December 26, 1995. The following describes the details of the revisions adopted in Version 2.

1. Revisions

A. Standards concerning data communications

A standard necessary for 32 kb/s digital data communications was added along with new information elements and particulars. This standard takes into account connection to fixed networks, such as ISDN, and ensures harmony with the standards prescribed in Version 1 (Revised Version-1) for voice and 3.1 kHz audio transmission services.

B. Standards concerning private-use PHS

The minimum necessary standard for interconnection was formulated while paying maximum respect to the private system standard specified in Version 1. The expression "treated as private reference" in Version 1 was changed to "private standard," and standards that were lacking were newly added.

C. Standards concerning wireless local loop (WLL)

Line standards concerning WLL was added as an appendix, as it will only apply overseas (outside Japan). In principle, the standard is based on the public system standard; differences with the latter standard were added and items were also added to accommodate subscriber and public telephone service.
With a view toward promoting the internationalization of PHS, general items necessary for an international standard were also added.
More specific details of the above-mentioned standards are explained below.

2. Details of Revisions

A. Standards concerning data communications
(1) Bearer service
A standard concerning 32 kb/s unrestricted digital information was added for digital data communications service.
(2) Call control standard
a. A call setup procedure was prescribed for unrestricted digital data, and "lower layer compatibility," "higher layer compatibility" and "repeat indicator" were added as information elements necessary for digital data communications.
b. Procedures were prescribed for confirming call control information in unrestricted digital data communications, for interworking of cell stations and for carrying data on carrier waves.
(3) Conformity with international standards
  • a. The provision concerning the "coding standard" for call control was changed from the previous national prescribed code (10) to the international prescribed code (00) in order to ensure compatibility with international standards.
  • b. A country code verification condition was added to the call sign procedure for confirming the connection destination. As a result, a country code coding standard and a message for country code notification were added.
B. Private PHS Standards
(1) Outgoing/incoming calls

En-bloc sending and overlapping sending are now possible. Moreover, besides the ordinary call receiving status, zone paging is now possible to support simultaneous calling of multiple PHS units.

(2) Location registration

A paging area method (resembling the public system standard) using an additional ID domain was newly added. A choice of three methods for configuring the paging area is now possible: fixed paging area based on the system information, fixed paging area using the additional ID, and PS (personal station) specified paging area.

(3) Handover

An object indicator was newly prescribed as a recalling-type handover function for private use. Two methods were prescribed for the authentication procedure at the time a handover is executed.

(4) Optional service
A procedure was prescribed for notification of the hooking signal as a private-use function.
(5) Conformity with international standards

A country code checking was added to the procedure for confirming the connection destination by call sign. So, a country code coding standard and a message for country code notification were added. Moreover, a control frequency standard was added to cover cases where private-use PHS terminals are used overseas.
This provision has been formulated as a common standard with the public system standard.

3. Standard concerning WLL

(1) Limitation on mobility

A handover function was defined as an option in order to simplify the system and also because the fundamental purpose of PHS is the provision of subscriber line service. A specific method for limiting mobility was also prescribed.

(2) Avoidance of asynchronous interference

A method of single frequency independent LCC (Logical Control Channel) was adopted to avoid interference in cases where multiple WLL systems are all asynchronous, and the scope of the parameters was also prescribed.

(3) Extension of CS-PS distance

The revised version allows and prescribes a method for advancing the timing for sending PHS terminal signals in order to secure the distance (3 ~ 5 km) generally required for WLL.

(4) Optional service
Optional service functions were prescribed to accommodate subscriber telephone and public telephone services, including procedures for billing information, non-billing information, circuit testing and hooking.
(5) Conformity with international standards
  • a. A country code checking condition was added to the procedure for confirming the connection destination by call sign. As a result, a country code coding standard and a message for country code notification were added. Moreover, in order to distinguish a public-use system from a WLL system, separate protocol switches were also prescribed for each system.
  • b. To avoid competition for frequencies between WLL systems and overseas-oriented private-use systems, the revised version prescribes that the former are to be operated in accordance with the control frequencies for overseas-oriented private-use systems.