Method for coupling the mobile terminal with the adapter

• US 20050208968A1
• Filed: 03/11/2005
• Published: 09/22/2005
• Est. Priority Date: 03/12/2004
• Status: Active Grant

• Current Assignee: DRNC Holdings, Inc. (InterDigital, Inc.)
• Original Assignee: T&A Mobile Phones Limited
• Inventors: Codeville, Sebastien
• Granted Patent: US 7,376,443 B2
• Time in Patent Office: Days
• US Class Current: 455/557
• CPC Class Codes: H04B 1/3822 specially adapted for use in vehicles H04B1/3827 takes precedence
• CPC Class Codes: H04B 1/3838 Arrangements for reducing RF exposure to the user, e.g. by changing the shape of the transceiver while in use
• CPC Class Codes: H04B 1/3877 Arrangements for enabling portable transceivers to be used in a fixed position, e.g. cradles or boosters

Abstract

The present invention provides a method for coupling the mobile terminal with the adapter. Firstly, coupling the mobile terminal with the adapter by RF induction; secondly, decreasing transmitted power of the mobile terminal so that the RF power leaking around is maintained below a specified value when the mobile terminal detects that it has been coupled with the adapter; finally, controlling the gain controlling means of the adapter by the mobile terminal to compensate the power loss due to the RF coupling and the transmitting power decreased by the mobile terminal itself, so that the transmitted power from the antenna of the adapter can reach the due power level transmitted by the mobile before it is coupled with the adapter. The structure of the mobile terminal is simplified and the price of the mobile terminal is decreased because the mobile terminal is coupled with the adapter through RF induction, and the RF changeover switch is not provided in the mobile terminal any more. Furthermore, the transmitting power in vehicle is always maintained below the European standard while the RF property of the mobile terminal is not degraded.

Claims

1. A method for coupling the mobile terminal with the adapter, said method comprising the following steps:

a. coupling said mobile terminal with said adapter by RF induction

b. decreasing transmitted power of said mobile terminal so that the RF power leaking around is maintained below a specified value when it detects that it has been coupled with the adapter; and

c. controlling the gain of the adapter by said mobile terminal to compensate the power loss due to the RF coupling and the transmitting power decreased by said mobile terminal itself, so that the transmitted power from the antenna of the adapter can reach the due power level transmitted by the mobile terminal before it is coupled with the adapter.

2. The method according to claim 1, wherein the RF coupling in step (a) induction is capacitance coupling.

3. The method according to claim 1, wherein said specified value for RF leakage is below 20 mW.

4. The method according to claim 1, wherein in order that the RF power leaking around is maintained below a specified value, a mobile terminal whose transmitting power is between 5th and 9th grade in GSM or between zero and 3rd grade in DCS decreases its own transmitting power by 10 dB, the power loss due to the coupling by RF induction being assumed to be 10 dB, then the mobile terminal controls the higher gain 20 dB increased by the amplifying means of the adapter to compensate the transmitting power decreased by the mobile terminal itself and the power loss due to the RF coupling.

5. The method according to claim 1, wherein a mobile terminal whose transmitting power is neither between 5th and 9th grade in GSM nor between zero and 3rd grade in DCS does not decrease its own transmitting power, the power loss due to the coupling by RF induction being assumed to be 10 dB, then the mobile terminal controls the lower gain to dB increased by the amplifying means the adapter to compensate the transmitting power decreased by the mobile terminal itself and the power loss due to the RF coupling.

6. A car-kit, having an adapter, said adapter includes:

a coupler, for coupling the mobile terminal with the adapter by RF induction; and

an amplifying means for amplifying the RF signal from the mobile terminal when the mobile terminal is coupled with the adapter by said RF induction.

7. The car-kit according to claim 6, wherein said coupler is the capacitive coupler.

8. The car-kit according to claim 6, wherein said amplifying means has a plurality of variable gains.

9. A mobile terminal comprising:

a means for determining its coupling with an adapter; and

a means for decreasing its own transmitting power to make the RF power leaking around be maintained below a specified value when said mobile terminal is coupled with the adapter, wherein said mobile terminal further includes a gain calculating means for calculating a gain value decreased by the mobile terminal and making an amplifying means in the adapter compensate the transmitting power decreased by said mobile terminal itself and a power loss due to the RF coupling according to said gain value and the gain value of the coupling loss, so that the transmitted power from the antenna of the adapter can reach the due power level transmitted by said mobile terminal before it is coupled with the adapter.

10. The mobile terminal according to claim 9, wherein said specified value for RF leakage is below 20 mW.

11. A mobile terminal according to claim 9, wherein in order that the RF power leaking around is maintained below a specified value, a mobile terminal whose transmitting power is between 5th and 9th grade in GSM or between zero and 3rd grade in DCS decreases its own transmitting power by 10 dB, the power loss due to the coupling by RF induction being assumed to be 10 dB, then the mobile terminal controls the higher gain 20 dB increased by the amplifying means of the adapter to compensate the transmitting power decreased by the mobile terminal itself and the power loss due to the RF coupling.

12. A mobile terminal according to claim 9, wherein a mobile terminal whose transmitting power is neither between 5th and 9th grade in GSM nor between zero and 3rd grade in DCS does not decrease its own transmitting power, the power loss due to the coupling by RF induction being assumed to be 10 dB, then the mobile terminal controls the lower gain to dB increased by the amplifying means the adapter to compensate the transmitting power decreased by the mobile terminal itself and the power loss due to the RF coupling.