Emergency number dialing from a fixed cellular terminal

• US 6,332,073 B1
• Filed: 10/19/1998
• Issued: 12/18/2001
• Est. Priority Date: 10/19/1998
• Status: Expired due to Term

• Current Assignee: Ericsson, Inc. (Telefonaktiebolaget LM Ericsson)
• Original Assignee: Ericsson, Inc. (Telefonaktiebolaget LM Ericsson)
• Inventors: Alayan, Hussein Abbas, Nilsson, Ulf Tomas Weine, Armantrout, Jeffrey A.
• Primary Examiner(s): BANKS HAROLD, MARSHA DENISE
• Application Number:
  US09/174,994
• Time in Patent Office: 1,156 Days
• Field of Search: 455/404, 455/422, 455/521, 455/414, 379/355, 379/356, 379/37, 379/38, 379/39, 379/40, 379/41, 379/42, 379/43, 379/44, 379/45, 379/46, 379/47, 379/48, 379/49, 379/50, 379/51
• US Class Current: 455/404.1
• CPC Class Codes: H04M 1/677 Preventing the dialling or sending of predetermined telephone numbers or selected types of telephone numbers, e.g. long distance numbers
• CPC Class Codes: H04M 1/724 User interfaces specially adapted for cordless or mobile telephones
• CPC Class Codes: H04M 1/72424 with manual activation of emergency-service functions
• 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 84/14 WLL [Wireless Local Loop]; RLL [Radio Local Loop]

Abstract

A fixed cellular terminal screens outgoing calls for an emergency number by comparing each digit as it is dialed to the corresponding digit in one or more previously stored emergency numbers. If all of the digits match the emergency number, an emergency call is placed. Normal call processing begins when one of the dialed digits does not match its respective digit in the emergency number.

Claims

1. A method for use in a fixed cellular unit requiring an action by the cellular unit or a user of the cellular unit after dialing a number to initiate an outgoing call to said number, said method screening outgoing calls for an emergency number comprising a plurality of digits, said method comprising:

(a) receiving a first dialed digit;

(b) comparing the first dialed digit to the first digit of the emergency number;

(c) if the first dialed digit matches the first digit of the emergency number, receiving a next dialed digit;

(d) comparing the next dialed digit to the next digit of the emergency number;

(e) repeating step (d) until either the next dialed digit does not match the next digit of the emergency number or the dialed digits match all of the digits of the emergency number;

(f) inhibiting said cellular unit from initiating the acquisition of a communication channel an outgoing call while performing steps (a) through (e), and

(g) responsive to receipt of dialed digits matching all of the digits of the emergency number, bypassing said action required to initiate an outgoing call and immediately setting up an emergency cellular call.

2. The method of claim 1 wherein the step of setting up an emergency cellular call further includes bypassing normal call set up procedures.

3. The method of claim 1 wherein the emergency number comprises a plurality of emergency numbers, wherein step (b) comprises:

comparing the first dialed digit to the first digit of each of the plurality of emergency numbers; and

wherein step (d) comprises;

comparing the next dialed digit to the next digit of each of the plurality of emergency numbers.

4. The method of claim 3 further comprising ceasing repetition of step (d) responsive to receipt of one dialed digit that does not match the next digit of the emergency number.

5. The method of claim 1 further comprising ceasing repetition of step (d) responsive to receipt of one dialed digits that does not match the next digit of the emergency number.

13. The method of claim 1, wherein said action is pressing a send key, and said bypassing said action comprises immediately setting up an emergency cellular call without pressing said send key.

14. The method of claim 1, wherein said action is waiting a selected period of time, and said bypassing said action comprises immediately setting up an emergency cellular call without waiting said selected period of time.

6. A cellular unit for use in a cellular network that connects a call to a public safety answering point having an emergency number responsive to an emergency message, the cellular unit having an input device for dialing digits and requiring an action by the cellular unit or the user after dialing to initiate an outgoing call to a dialed number, the cellular unit comprising:

a digit collector adapted to sequentially receive each digit dialed at the input device;

a memory storing an emergency number having digits;

a controller adapted to sequentially compare each received dialed digit in the digit collector to the emergency number digits, and to inhibit said cellular unit from initiating the acquisition of a communication channel an outgoing call while said controller is sequentially comparing each received dialed digit in the digit collector to the emergency number digits; and

a cellular terminal adapted to bypass the required action and immediately send an emergency message to the cellular network responsive to the controller matching all of the received dialed digits to the digits of the emergency number.

7. The cellular unit of claim 6 wherein the cellular terminal is fixed in one location.

8. The cellular unit of claim 6 wherein the memory is adapted to store a plurality of emergency numbers, the controller being adapted to sequentially compare each dialed digit to the digits in each of the plurality of emergency numbers.

9. The cellular unit of claim 8 wherein the cellular terminal is adapted to send the emergency message responsive to the received dialed digits matching any one of the emergency numbers.

10. A method for use in a cellular unit operating in a cellular network that connects a call to a public safety answering point having an emergency number responsive to an emergency message, the cellular unit having a digit input device and requiring an action by the cellular unit or a user of the cellular unit after dialing to initiate an outgoing call to said number, the method comprising:

receiving each digit as it is input in the input device;

sequentially comparing each digit as it is received to digits of the emergency number;

inhibiting said cellular unit from initiating the acquisition of a communication channel an outgoing call while receiving and sequentially comparing said digits;

using normal call processing if any of the compared digits do not match; and

bypassing said action required to initiate an outgoing call and immediately sending an emergency message to the cellular network if the received digits match all of the corresponding digits of the emergency number.

11. The method of claim 10 wherein the step of sending an emergency message further includes bypassing the normal call processing step of sending a set up request message.

12. The method of claim 10 wherein the emergency number comprises a plurality of emergency numbers, wherein the step of comparing comprises:

sequentially comparing each digit as it is received to digits of each of the emergency numbers.