Method of capturing a control channel for calls following an emergency call
First Claim
1. An emergency call control method for a mobile communications terminal is a mobile communications system, wherein when an emergency call is made, an identifacation code of a service area in which said emergency call is made is held, and when making a next call after said emergency call is made, a control channel for the next call is captured based on said held identification code.
2 Assignments
0 Petitions
Accused Products
Abstract
To perform control of a mobile telephone system which uses a dedicated control channel type multichannel access system, when an emergency telephone call is made from a mobile telephone to the police or fire department, the mobile telephone references a memory into which is stored the identification code of a service area within which calling is permitted, the base station having the highest received field strength of the control channel radio signals of base stations in this service area is selected and the emergency call is made to the thus selected base station. When doing this, the mobile telephone stores the identification code of the base station to which the emergency call was made, and when a next call is made after the emergency call is completed, the call signal is sent on the control channel of the base station to which the emergency call was made, based on the thus stored identification code of the base station.
49 Citations
17 Claims
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1. An emergency call control method for a mobile communications terminal is a mobile communications system, wherein when an emergency call is made, an identifacation code of a service area in which said emergency call is made is held, and when making a next call after said emergency call is made, a control channel for the next call is captured based on said held identification code.
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2. An emergency call control method for a mobile telephone in a mobile telephone system which uses a dedicated control channel type multichannel access system as the method of radio circuit allocation, wherein:
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when an emergency telephone number is called, the mobile telephone references a memory into which is stored the identification code of a service area within which calling is permitted; the emergency call base station identification codes in a service area to be used when making an emergency call are stored beforehand and an emergency call is made via a control channel of a service area specified by said base station identification code; the base station having the highest received field strength of the control channel radio signals of base stations in the service areas corresponding to said stored identification codes is selected, and the emergency call is made to the thus selected base station; the base station identification code to which the emergency call was made is stored; when a call is made after the completion of the emergency call, a calling signal is sent by using the control channel of the base station to which the emergency call was made, by means of the identification code which had been stored; and when a call is made next after the completion of said emergency call, in the case in which the base station recognizes the call and returns a call response signal, the identification code of the base station to which said emergency call was made is erased from memory. - View Dependent Claims (3, 4, 5, 10, 12, 14, 15)
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6. An emergency call control method for a mobile telephone in a mobile telephone system which uses a dedicated control channel type multichannel access system as the method of radio circuit allocation, wherein:
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when an emergency telephone number is called, the mobile telephone references a memory into which is stored the identification code of a service area within which calling is permitted; the base station identification codes in a service area which is used when making an emergency call are stored beforehand and an emergency call is made via a control channel of a service area specified by a thus stored identification code; the base station identification code to which the emergency call was made is stored; when a next call is made after the completion of the emergency call, a calling signal is sent via a control channel of the base station to which the emergency call was made, by means of the identification code which had been stored; and when a call is made next after the completion of said emergency call, in the case in which the base station recognizes the call and returns a call response signal, the identification code of the base station to which said emergency call was made is erased from memory. - View Dependent Claims (7, 8, 9, 11, 13, 16, 17)
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Specification