Cordless telephone system and its independent base station and mobile station

• US 6,078,822 A
• Filed: 06/18/1998
• Issued: 06/20/2000
• Est. Priority Date: 06/19/1997
• Status: Expired due to Fees

• Current Assignee: NEC Electronics Corporation (Renesas Electronics Corporation)
• Original Assignee: NEC Corporation
• Inventors: Tsujita, Shigeru
• Primary Examiner(s): Trost, William G.
• Assistant Examiner(s): LEGREE, TRACY MICHELLE
• Application Number:
  US09/099,641
• Time in Patent Office: 733 Days
• Field of Search: 455/552, 455/426, 455/461, 455/553, 455/414, 455/465, 455/416, 455/422, 455/445, 455/74.1, 455/417, 455/462, 455/463, 455/458, 379/215
• US Class Current: 455/552.1
• CPC Class Codes: H04M 1/72513 On hold, intercom or transfer communication modes

Abstract

A cordless telephone system including a independent base station and a dual purpose mobile station which enables the mobile station to respond to an incoming call from a public base station while a first phone call is being conducted by the mobile station through the independent base station. During this operation, the first phone call is either put on hold or disconnected thus enabling the mobile station to shift to the call from the public base station. The independent base station is provided with a public reception antenna, a reception radio circuit, a mobile station reception channel CODEC, a public reception control section, and a public reception interface, enabling it to receive a call signal from the public base station intended for the dual purpose mobile station. Due to this constitution, the independent base station receives the call signal from the public base station intended for the dual purpose mobile station during the first phone call.

Claims

1. A cordless telephone system comprising:

an independent base station connected to a fixed network;

a mobile station connected to said independent base station and either to a mobile communication network or said fixed network; and

a public base station in which an original communication service control of a mobile communication is executed, wherein when said mobile station is conducting a first telephone call through said independent base station, said public base station transmits a call signal to said mobile station, said independent base station receives said call signal instead of said mobile station and transmits to said mobile station a call waiting notification signal which represents reception of said call signal, said mobile station receives said call waiting notification signal from said independent base station, temporarily puts the first call on hold, executes an incoming processing between said mobile station and said public base station and returns to said first telephone call in response to an action from said user, said mobile station conducts a second telephone call through said public base station while either disconnecting or holding said first telephone call through said independent base station, when said second telephone call through said public base station is terminated, if said first telephone call through said independent base station is held, enabling first telephone call to continue while removing said hold.

2. A cordless telephone system as claimed in claim 1, wherein said independent base station comprises:

an antenna for performing transmission-reception of radio waves;

a transmitter-receiver radio circuit for executing both demodulation of received radio waves and modulation of transmission data;

an independent base station channel CODEC section for executing both decoding of a demodulation signal from said transmitter-receiver radio circuit and coding of transmission data;

a call/circuit control section for executing voice coding of a sound signal received from said fixed network, and voice decoding of voice data which is decoded at said independent base station channel CODEC section, and for receiving a call signal from said fixed network;

a home independent base station control section for executing power control among said call/circuit control section, said independent base station channel CODEC section, and said transmitter-receiver radio circuit, and for executing communication protocol control between said independent base station control section and said mobile station;

a public reception antenna for receiving public radio waves transmitted from said public base station;

a reception radio circuit for executing demodulation of received public radio waves from said public reception antenna;

a mobile station reception channel CODEC section for executing decoding of a demodulation signal from said reception radio circuit;

a public reception control section for detecting said call signal intended for said mobile station from among the decoded data from said mobile station reception channel CODEC section in order to notify said call signal to said home independent base station control section; and

a public reception interface section provided within said home independent base station control section for receiving a call signal detection notification from said public reception control section,

wherein said independent base station receives said call signal which is transmitted from said public base station to said mobile station during said first telephone call, wherein subsequently, said mobile station receives said call waiting notification signal from said independent base station, wherein before said mobile station disconnects said first telephone call through said independent base station, said mobile station is capable of shifting to the second telephone call through said public base station.

3. A cordless telephone system as claimed in claim 2, wherein before said mobile station shifts to said second telephone call, said first telephone call is temporarily put in a hold state by manipulation of the user, said hold state being removed after disconnection of said second telephone call, whereby said mobile station is capable of being returned to said first telephone call through said independent base station.

4. In a cordless telephone system, a mobile station comprising:

an antenna for performing transmission-reception of radio waves;

a transmitter-receiver radio circuit for executing both demodulation of received radio waves and modulation of transmission data;

a mobile station channel CODEC section for executing both decoding of a demodulation signal from said transmitter-receiver radio circuit and coding of said transmission data;

a speaker for outputting voice audio;

a microphone for inputting voice audio;

a telephone call control section for executing both voice coding of sound signals received from said microphone and voice decoding of voice data decoded by said mobile station channel CODEC section;

a mobile station control section for executing both power control of said telephone call control section, said mobile station channel CODEC section, and said transmitter-receiver radio circuit and for executing communication protocol control; and

a call waiting notification detecting section provided within said mobile station control section, and being capable of receiving a call waiting notification signal which represents that a public base station has transmitted a call signal to said mobile station through an independent base station while said mobile station control section is conducing a telephone call through said independent base station.

5. In a cordless telephone system, an independent base station comprising:

an antenna for performing transmission-reception of radio waves;

a transmitter-receiver radio circuit for executing both demodulation of received radio waves and modulation of transmission data;

an independent base station channel CODEC section for executing both decoding of demodulation signals from said transmitter-receiver radio circuit and coding of said transmission data;

a call/circuit control section for executing both voice coding of a sound signal received from a fixed network, and voice decoding of voice data which is decoded by said independent base station channel CODEC section, and for receiving a call signal from said fixed network;

a home independent base station control section for executing power control among said call/circuit control section, said independent base station channel CODEC section, and said transmitter-receiver radio circuit, and for executing communication protocol control between said independent base station and a mobile station;

a public reception antenna for receiving public radio waves which are transmitted from a public base station;

a reception radio circuit for executing demodulation of received public radio waves from said public reception antenna;

a mobile station reception channel CODEC section for executing decoding of demodulation signals from said reception radio circuit;

a public reception control section for detecting a call signal intended for said mobile station from among decoded data from said mobile station reception channel CODEC section in order to notify said home independent base station control section of said call signal; and

a public reception interface section provided within said home independent base station control section, for receiving a call signal detection notification from said public reception control section,

wherein when said public reception interface section receives said call signal detection notification from said public reception control section, said independent base station transmits a call waiting notification signal notifying said mobile station of said call signal from said public base station.

6. In a cordless telephone system, an independent base station as claimed in claim 5, wherein said home independent base station control section, said public reception interface section, and said public reception control section constitute one block or a plurality of blocks.

7. In a cordless telephone system an independent base station as claimed in claim 5, wherein said independent base station channel CODEC section and said mobile station reception channel CODEC section constitute one block or a plurality of blocks.

8. In a cordless telephone system, an independent base station as claimed in claim 5, wherein said transmitter-receiver radio circuit and said reception radio circuit constitute one functional block or a plurality of functional blocks.

9. A cordless telephone system including an independent base station which is connected to a fixed network, a mobile station which is connected to said independent base station and either to a mobile communication network or a fixed network, and a public base station in which an original communication service control of a mobile communication is executed, wherein when said mobile station is conducting a first telephone call through said independent base station, said public base station transmits a call signal to said mobile station, said call signal identifying a second telephone call a radio communication method comprising the steps of:

receiving said call signal by said independent base station instead of said mobile station and transmitting a call waiting notification signal which represents reception of said call signal toward said mobile station during said first telephone call;

executing an incoming processing between said mobile station and said public base station while executing a temporary hold-manipulation in relation to the first telephone call;

returning to said first telephone call when said incoming processing ends;

enabling said mobile station to execute said second telephone call through said public base station while either disconnecting or holding said first telephone call in relation to said independent base station, when there is a response from the user; and

enabling said first telephone (all to continue by removing the holding state, when said second telephone call in relation to said public base station is terminated, and if said first telephone call through said independent base station is maintained by way of the hold state.

10. A radio communication method of an independent base station comprising the steps of:

performing transmission-reception of radio waves using an antenna;

executing both demodulation of received radio waves and modulation of transmission data using a transmitter-receiver radio circuit;

executing both decoding of demodulation signals from said transmitter-receiver radio circuit and coding of transmission data using an independent base station channel CODEC section;

executing both voice decoding of voice data which is decoded by said independent base station channel CODEC section, and voice coding of sound signals from a fixed network, and receiving a voice coding of sound signals received from said fixed network using a call/circuit control section;

executing communication protocol control among said call/circuit control section, said independent base station channel CODEC section, a power control of said transmitter-receiver radio circuit and a mobile station using a home independent base station control section;

receiving public radio waves transmitted from a public base station using a public reception antenna;

executing demodulation of received public radio waves from said public reception antenna using a reception radio circuit;

executing decoding of public demodulation signals from said reception radio circuit by means of a mobile station reception channel CODEC section;

detecting a call signal for said mobile station from among the decoded data from said mobile station reception channel CODEC section in order to notify said call signal to said home independent base station control section, said detecting being performed by a public reception control section, said call signal identifying a second telephone call through said public base station; and

receiving a call signal detection notification from said public reception control section using a public reception interface section which is provided within said home independent base station control section,

wherein said independent base station receives said call signal which is transmitted from said public base station to said mobile station during a first telephone call through said independent base station, wherein said mobile station receives a call waiting notification signal from said independent base station, wherein before said mobile station disconnects said first telephone call through said independent base station by manipulation of the user said mobile station is capable of shifting to said second telephone call through said public base station.

11. A radio communication method of a mobile station comprising the steps of:

performing transmission-reception of radio waves using an antenna;

executing both demodulation or received radio waves and modulation of transmission data using a transmitter-receiver radio circuit;

executing both decoding of demodulation signals from said transmitter-receiver radio circuit and coding of said transmission data using a mobile station channel CODEC section;

outputting voice audio using a speaker;

inputting voice audio using a microphone;

executing both voice coding of sound signals received from said microphone and voice decoding of voice data decoded by said mobile station channel CODEC section using a telephone call control section;

executing both power source control of said telephone call control section, said mobile station channel CODEC section, and said transmitter-receiver radio circuit and communication protocol control using a mobile station control section; and

receiving a call waiting notification signal which represents that a public base station has transmitted a call signal to said mobile station through an independent base station while said mobile station control section is conducting a first telephone call through said independent base station, said reception being performed by a call waiting notification detecting section which is provided within said mobile station control section.

12. A radio communication method of an independent base station comprising the steps of:

performing transmission-reception of radio waves using an antenna;

executing both demodulation of received radio waves and modulation of transmission data using a transmitter-receiver radio circuit;

executing both decoding of demodulation signals from said transmitters-receiver radio circuit and coding of said transmission data using an independent base station channel CODEC section;

executing both voice coding of a sound signal received from a fixed network, and voice decoding of voice data which is decoded by said independent base station channel CODEC section, and receiving a call signal from said fixed network by means of a call/circuit control section;

executing power control among said call/circuit control section, said independent base station channel CODEC section, and said transmitter-receiver radio circuit, and communication protocol control between a mobile station and a home independent base station control section;

receiving public radio waves which are transmitted from a public base station using a public reception antenna;

executing demodulation of received public radio waves from said public reception antenna using a reception radio circuit;

executing decoding of public demodulation signals from said reception radio circuit using a mobile station reception channel CODEC section; and

detecting a public call signal for said mobile station from decoded data from said mobile station reception channel CODEC section in order to notify said home independent base station control section of the detection of said public call signal, said detecting being performed by a public reception control section,

wherein when said public reception interface section receives a call signal detection notification from said public reception control section, said public base station transmits a call waiting notification signal notifying that it has caused the public call signal to be transmitted to said mobile station.