Claims
- 1. A mobile communications system including a mobile station and a database of a mobile network which registers a location of the mobile station, comprising:in said mobile station, means for storing one or more codec types supported by said mobile station; in said mobile station, means for detecting a condition that the location of said mobile station is to be registered in said database; in said mobile station, means for transmitting to said mobile network a signal for notifying said database of a change of the codec types supported by said mobile station in response to detection by said means for detecting, wherein the signal includes the codec types stored in said storing means; in said database, means for receiving said signal from said means for transmitting to detect the notification of change of codec types; and in said database, means for updating codec types registered in accordance with the change of codec types detected.
- 2. The mobile communications system as claimed in claim 1, wherein:said mobile network comprises a switching center interposed between said mobile station and said database; and said switching center transfers to said database only a codec type supported by said switching center among the codec types transmitted to said switching center from said mobile station.
- 3. The mobile communications system as claimed in claim 1 or 2, wherein:said signal for notifying said change of the codec types is added to a request for location registration.
- 4. The mobile communications system as claimed in claim 1 or 2, wherein:said change of the codec types is transmitted to said mobile network from said mobile station independently of a request for location registration.
- 5. A mobile station in a mobile communications system including a database of a mobile network which registers a location of the mobile station, comprising:means for storing one or more codec types supported by said mobile station; means for detecting a condition that the location of said mobile station is to be registered in said database; and means for transmitting to said mobile network a signal for notifying said database of a change of the codec types supported by said mobile station in response to detection by said means for detecting, wherein the signal includes the codec types stored in said storing means.
- 6. The mobile station as claimed in claim 5, wherein:in said signal, said change of codec types is added to a request for location registration.
- 7. The mobile station as claimed in claim 5, wherein:said change of codec types is transmitted to said mobile network from said mobile station independently of a request for location registration.
Priority Claims (1)
Number |
Date |
Country |
Kind |
9-268925 |
Oct 1997 |
JP |
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Parent Case Info
This application is a continuation under 35 U.S.C. §120 and §365 of International Application No. PCT/JP98/04421, filed Sep. 30, 1998, which in turn claims priority of Japanese Patent Application No. 268925, filed Oct. 1, 1997, both of which are incorporated herein by reference.
US Referenced Citations (10)
Foreign Referenced Citations (1)
Number |
Date |
Country |
07030947 |
Jan 1995 |
JP |
Non-Patent Literature Citations (1)
Entry |
International Search Reports (in English and Japanese) for International Application No. PCT/JP98/04421, with search reports mailed Dec. 8, 1998. |
Continuations (1)
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Number |
Date |
Country |
Parent |
PCT/JP98/04421 |
Sep 1998 |
US |
Child |
09/323413 |
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US |