Method for making emergency calls cordless telecommunications systems

• US 6,393,268 B1
• Filed: 03/11/1999
• Issued: 05/21/2002
• Est. Priority Date: 09/11/1996
• Status: Expired due to Term

• Current Assignee: Siemens AG
• Original Assignee: Siemens AG
• Inventors: Biedermann, Rolf
• Primary Examiner(s): Congle, Thanh
• Assistant Examiner(s): Corsaro, Nick
• Application Number:
  US09/254,767
• Time in Patent Office: 1,167 Days
• Field of Search: 455/404, 455/465, 455/464, 455/455, 455/462
• US Class Current: 455/404.1
• CPC Class Codes: H04M 1/72424 with manual activation of emergency-service functions
• CPC Class Codes: H04M 1/72502 with one base station connected to a single line
• CPC Class Codes: H04M 2250/08 home cordless telephone systems using the DECT standard
• CPC Class Codes: H04W 4/90 Services for handling of emergency or hazardous situations, e.g. earthquake and tsunami warning systems [ETWS]
• CPC Class Codes: H04W 76/50 for emergency connections
• CPC Class Codes: H04W 84/045 using private Base Stations, e.g. femto Base Stations, home Node B

Abstract

A method for making emergency calls in cordless telecommunications systems, in particular DECT/GAP systems, wherein in order to be able to make emergency calls is proposed, which allows for the fact that the contains mobile parts which do or do not have access authorization to base stations, such that to an emergency call connection occurs in all cases.

Claims

1. A method for making emergency calls in cordless telecommunications systems, the method comprising the steps of:

initiating emergency calls to emergency call services points at cordless mobile parts using manual interface procedures via cordless base stations connected to the cordless mobile parts by telecommunication;

transmitting, with the cordless mobile part, a first telecommunication with an emergency call-specific temporary first identification to the cordless base station;

searching, with the mobile part using the telecommunication, at the cordless base station for an emergency call connection to the emergency call service point;

distinguishing, with the cordless base station, between a usual communications request and an emergency call using the first identification received;

responding, with the cordless base station, to the first telecommunication with a second telecommunication, and ensuring that a free telecommunication channel is set up for the emergency call connection;

transmitting, with the cordless mobile part, to the cordless base station a third telecommunication with a first information element containing a call indicator for the emergency call, and with a second information element containing a mobile part-specific second identification, and with third information element containing a zero contents indicator, wherein the cordless base station accepts the third telecommunication without checking the second and third information elements and immediately proceeds to set up the emergency call connection to the emergency call service point; and

setting up, with the cordless base station, the emergency call connection to the emergency call service point and informing the cordless mobile part of the setting up of the emergency call connection in response to the third telecommunication via a fourth telecommunication.

2. A method as claimed in claim 1, wherein the emergency call connection to the emergency call service point is set up by automatically dialing an emergency call number if the first cordless base station is a private cordless base station.

3. A method as claimed in claim 1, wherein the emergency call connection to the emergency call service point is set up automatically if the first cordless base station is a public cordless base station.

4. A method as claimed in claim 1, wherein the free telecommunications channel is set up for the emergency call connection by reserving one telecommunications channel from a plurality of telecommunications channels available in the cordless base station.

5. A method as claimed in claim 1, wherein the free telecommunications channel is set up for the emergency call connection such that if all of the plurality of telecommunications channels available in the cordless base station are occupied, one of the plurality of telecommunications channels is freed.

6. A method as claimed in claim 1, wherein the telecommunications channel includes both a radio channel between the cordless base station and the cordless mobile part and a voice/data channel between the cordless base station and the emergency call service point.

7. A method as claimed in claim 1, wherein the established emergency call connection within the cordless telecommunications system is cleared down by the cordless base station.

8. A method as claimed in claim 1, further includes the steps of:

transmitting additional information by cordless base stations wherein the information is received by cordless mobile parts and indicates that the emergency calls can be passed onto the emergency call service points via the cordless base stations; and

synchronizing first cordless mobile parts, which receive the additional information from first cordless base stations, and to which the first cordless mobile parts do not have any access authorization, as a precaution for making emergency calls, at least temporarily with the first cordless base stations for a telecommunication which is restricted to making emergency calls.

9. A method as claimed in claim 1 wherein the cordless telecommunications system is a DECT/GAP system.

10. A method as claimed in claim 1, wherein the cordless telecommunications system is a PHS system.

11. A method as claimed in claim 1, wherein the cordless telecommunications system is a WACS system.

12. A method as claimed in claim 1, wherein the cordless telecommunications system is a PACS system.

13. A method as claimed in claim 1, wherein the cordless telecommunications system is a CDMA system.

14. A method as claimed in claim 1, wherein the cordless telecommunications system is a TDMA system.

15. A method as claimed in claim 1, wherein the cordless telecommunications system is an FDMA system.

16. A method as claimed in claim 1, wherein the cordless telecommunications system is a hybrid system of a CDMA system, a TDMA system and an FDMA system.