Mobile station and method for controlling mobile station side communication, base station and method for controlling base station side communication, and communication system

• US 20070010276A1
• Filed: 06/01/2004
• Published: 01/11/2007
• Est. Priority Date: 06/03/2003
• Status: Active Grant

• Current Assignee: Electronic Navigation Research Institute, Mitsubishi Space Software Company Limited (Mitsubishi Electric Corporation)
• Original Assignee: Electronic Navigation Research Institute, Mitsubishi Space Software Company Limited (Mitsubishi Electric Corporation)
• Inventors: Yamagishi, Atsushi, Shiomi, Kakuichi, Kanada, Naoki, Meguro, Naritomo
• Granted Patent: US 7,640,014 B2
• Time in Patent Office: Days
• US Class Current: 455/522
• 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 52/281 taking into account user or data type priority
• CPC Class Codes: H04W 76/50 for emergency connections

Abstract

When emergency communication etc. is sent, it aims at preferentially dealing with the emergency communication etc. by a simple and effective method. It is a communication system in which a base station 100 and a mobile station 200a establish communication for emergency situation, in time of emergency, wherein the mobile station 200a switches an output adjustment from the normal mode to the emergency mode and sends the communication for emergency situation at the largest output possible. The base station 100 receives a strong radio wave from the mobile station 200a which sent the communication for emergency situation. The base station 100 continues to output suppression signals for suppressing signal intensity to the other mobile stations. The other mobile stations are suppressed by the near-far effect, and it becomes impossible for the base station 100 to receive communication except for the communication for emergency situation. Only the mobile station 200a which sent the communication for emergency situation establishes a channel to the base station 100. After the establishment, the mobile station 200a which sent the communication for emergency situation performs communication according to the normal communication procedure.

Claims

1. A mobile station which communicates with a base station comprising:

an emergency communication call part to request to initiate a call of communication for emergency situation, in time of emergency;

an output control part, in response to a request from the emergency communication call part, to control field strength of a signal to be used for the communication for emergency situation so that the communication for emergency situation will be established at the field strength, with submerging communication between other mobile stations and the base station; and

a mobile station side transmission part to transmit a call signal of the communication for emergency situation to the base station, at the field strength controlled by the output control part.

2. The mobile station of claim 1, wherein the output control part increases the field strength of the call signal until the field strength becomes strong enough for a signal to be decoded, the signal being received by the base station from the mobile station in case of the communication for emergency situation, with submerging a signal received by the base station from the mobile station in case of normal communication.

3. The mobile station of claim 1, wherein the output control part continues to retain the field strength to be strong enough to establish the communication for emergency situation with submerging the communication between the other mobile stations and the base station until the communication for emergency situation with the base station is completed.

4. The mobile station of claim 1, wherein the mobile station side transmission part transmits identification information indicating to be the communication for emergency situation, together with the call signal of the communication for emergency situation, at emergency field strength controlled by the output control part.

5. The mobile station of claim 1, wherein

after the mobile station side communication part transmits the call signal of the communication for emergency situation, the output control part ignores a suppression signal of the field strength transmitted from the base station until channel for emergency situation to the base station is established in response to the call signal, and after the channel for emergency situation is established, suppresses the field strength to be normal field strength, and

after the channel for emergency situation to the base station is established, the mobile station side transmission part performs the communication for emergency situation with the base station at the normal field strength controlled by the output control part.

6. The mobile station of claim 1, wherein the mobile station side transmission part continues to transmit the call signal of the communication for emergency situation to the base station at emergency field strength controlled by the output control part, until channel for emergency situation to the base station is established.

7. The mobile station of claim 1, wherein

in time of an emergency of an aircraft or a ship, the emergency communication call part requests to initiate a call of distress communication as the call of the communication for emergency situation, and

the output control part, in response to the request of the emergency communication call part, controls the field strength used for communication with the base station so that the communication for emergency situation will be established at the field strength, with submerging the communication between the other mobile stations and the base station.

8. The mobile station of claim 1, wherein

the emergency communication call part requests to initiate a call of at least one of emergency communication, safety communication, or extraordinary communication, as the call of the communication for emergency situation, and

the output control part, in response to the request of the emergency communication call part, controls the field strength being an antenna power in a range not against laws and used for communication with the base station so that the communication for emergency situation will be established at the field strength, with submerging the communication between the other mobile stations and the base station.

9. The mobile station of claim 1, wherein

the emergency communication call part requests to initiate a call of at least one of emergency communication, safety communication, or extraordinary communication, as the call of the communication for emergency situation, and

the output control part, in response to the request of the emergency communication call part, controls the field strength being an antenna power in a range not against laws and used for communication with the base station by using directivity of an antenna, so that the communication for emergency situation will be established at the field strength, with submerging the communication between the other mobile stations and the base station.

10. A method for controlling mobile station side communication, which communicates with a base station, comprising:

requesting to initiate a call of communication for emergency situation, in time of emergency;

in response to the requesting to initiate the call of the communication for emergency situation, controlling field strength of a signal to be used for the communication for emergency situation so that the communication for emergency situation will be established at the field strength, with submerging communication between other mobile stations and the base station; and

transmitting a call signal of the communication for emergency situation to the base station, at the field strength controlled.

11. A base station which communicates with a plurality of mobile stations comprising:

a base station side reception part to receive signals transmitted from the plurality of mobile stations;

a detection part to detect a call signal of communication for emergency situation from the signals received by the base station side reception part, based on field strength of the signals received; and

a base station side transmission part to transmit an assignment signal for assigning channel for emergency situation to a mobile station which sent the call signal of the communication for emergency situation detected by the detection part.

12. The base station of claim 11, wherein the base station side transmission part transmits the assignment signal for assigning all or a part of assignable channel to the mobile station which sent the call signal of the communication for emergency situation detected by the detection part.

13. The base station of claim 11, wherein, in case of the detection part detecting the call signal of the communication for emergency situation, the base station side transmission part transmits suppression signals of the field strength to the plurality of mobile stations, and transmits the assignment signal to the mobile station with which communication does not stop even by the suppression signals of the field strength transmitted.

14. The base station of claim 13, wherein the base station side transmission part transmits signals directing a reduction of the field strength, a keeping of a present condition of the field strength, or a physical disconnection of normal communication, to mobile stations, as the suppression signals of the field strength.

15. A method for controlling base station side communication, which communicates with a plurality of mobile stations, comprising:

receiving signals transmitted from the plurality of mobile stations;

detecting a call signal of communication for emergency situation from the signals received, based on field strength of the signals received; and

transmitting an assignment signal for assigning channel for emergency situation to a mobile station which sent the call signal of the communication for emergency situation detected.

16. A communication system where a base station and a plurality of mobile stations communicate comprising,

each mobile station of the plurality of mobile stations including:

an emergency communication call part to request to initiate a call of communication for emergency situation, in time of emergency;

an output control part, in response to a request from the emergency communication call part, to control field strength to be used for the communication for emergency situation so that the communication for emergency situation will be established at the field strength, with submerging communication between other mobile stations and the base station; and

a mobile station side transmission part to transmit a call signal of the communication for emergency situation to the base station, at the field strength controlled by the output control part, and

the base station including;

a base station side reception part to receive signals transmitted from the plurality of mobile stations;

a detection part to detect a call signal of communication for emergency situation from the signals received by the base station side reception part, based on field strength of the signals received; and

a base station side transmission part to transmit an assignment signal for assigning channel for emergency situation to a mobile station which sent the call signal of the communication for emergency situation detected by the detection part.

17. The communication system of claim 16, wherein the communication system includes a plurality of base stations, and each base station of the plurality of base stations is located so that a coverage area of the each base station may not overlap and independently performs normal communication and communication for emergency situation with the plurality of mobile stations existing in the coverage area of the each base station.

18. A program, having computer executable processing, for controlling mobile station side communication, which communicates with a base station, comprising:

processing of requesting to initiate a call of communication for emergency situation, in time of emergency;

in response to the requesting to initiate the call of the communication for emergency situation, processing of controlling field strength of a signal to be used for the communication for emergency situation so that the communication for emergency situation will be established at the field strength, with submerging communication between other mobile stations and the base station; and

processing of transmitting a call signal of the communication for emergency situation to the base station, at the field strength controlled.

19. A program, having computer executable processing, for controlling base station side communication, which communicates with a plurality of mobile stations, comprising:

processing of receiving signals transmitted from the plurality of mobile stations;

processing of detecting a call signal of communication for emergency situation from the signals received, based on field strength of the signals received; and

processing of transmitting an assignment signal for assigning channel for emergency situation to a mobile station which sent the call signal of the communication for emergency situation detected.