Mobile Wireless Communication Terminal and Mobile Wireless Communication System

• US 20070238418A1
• Filed: 06/20/2005
• Published: 10/11/2007
• Est. Priority Date: 07/09/2004
• Status: Active Grant

• Current Assignee: Sony Corporation (Sony Group Corp.)
• Original Assignee: Sony Ericsson Mobile Communications Japan Incorporated (Sony Group Corp.)
• Inventors: Mizusawa, Nishiki, Nagano, Tomonori
• Granted Patent: US 7,787,898 B2
• Time in Patent Office: Days
• US Class Current: 455/69
• CPC Class Codes: H04B 5/48 Transceivers
• CPC Class Codes: H04B 5/72 for local intradevice communication
• CPC Class Codes: H04W 16/14 Spectrum sharing arrangements between different networks
• CPC Class Codes: H04W 28/22 Negotiating communication rate
• CPC Class Codes: H04W 52/241 taking into account channel quality metrics, e.g. SIR, SNR, CIR, Eb/lo
• CPC Class Codes: H04W 52/247 where the output power of a terminal is based on a path parameter sent by another terminal
• CPC Class Codes: H04W 88/06 adapted for operation in multiple networks or having at least two operational modes, e.g. multi-mode terminals

Abstract

Receiving sensitivity deterioration in wireless communication due to a spurious radiation wave generated from a card reader/writer is suppressed in a case where a mobile phone terminal is provided with a contactless IC card reader/writer or a contactless IC card. The mobile phone terminal provided with the contactless IC card reader/writer performs measurement of a wireless status upon reception (step S1) and transmission power wetting (step S2), and when an instruction to start a reader/writer function is inputted from a user (step S3), wireless status deterioration due to spurious radiation from the reader/writer is predicted (step S4). Then, the mobile phone terminal judges whether control to reduce the transmission speed is necessary or not, on the basis of a value of the deterioration predicted wireless status (step S5), and when judged necessary, the transmission speed is reduced (step S6).

Claims

1. A mobile wireless communication terminal having a contactless communication function to perform contactless communication by using a carrier wave of a predetermined frequency, characterized by having:

communication means for performing wireless communications with a base station by using a frequency band overlapping at least in part with a spurious radiation wave frequency range resulting from the carrier wave of said predetermined frequency;

transmission power setup means for setting up signal transmission power in accordance with an instruction from said base station;

reception intensity measurement means for measuring signal reception intensity in wireless communications with said base station;

reception quality information generation means for generating information representing reception quality of the terminal on the basis of the signal reception intensity measured by said reception intensity measurement means;

noise power estimation means for estimating noise power of said spurious radiation wave in the frequency band used for the wireless communications with said base station, on the basis of the signal transmission power set up by said transmission power setup means, the signal reception intensity measured by said reception intensity measurement means and a coefficient inherent to the terminal;

detection means for detecting at least that said contactless communication function is started; and

control means for comparing a predetermined threshold value with said reception quality taking account of the estimated noise power of said spurious radiation wave when said detection means detects that said contactless communication function is started, and for controlling said communication means to lower a transmission speed for wireless communication with said base station in a case where said reception quality is equal to or less than the predetermined threshold value.

2. The mobile wireless communication terminal according to claim 1, characterized in that:

said control means causes, after lowering the transmission speed for wireless communications with the base station, said contactless communication function to perform contactless communications.

3. A mobile wireless communication terminal having a contactless communication function to perform contactless communication by using a carrier wave of a predetermined frequency, characterized by having:

communication means for performing wireless communications with a base station by using a frequency band overlapping at least in part with a spurious radiation wave frequency range resulting from the carrier wave of said predetermined frequency;

detection means for detecting at least that said contactless communication function is started; and

control means for generating a predetermined signal when said detection means detects that said contactless communication function is started, causing said communication means to transmit the predetermined signal from to said base station, and controlling said communication means to lower the transmission speed for wireless communication with the base station when receiving an instruction to lower the transmission speed from the base station after transmitting the predetermined signal to the base station.

4. The mobile wireless communication terminal according to claim 3, characterized in that:

transmission power setup means for setting up signal transmission power in accordance with the instruction from said base station;

reception intensity measurement means for measuring signal reception intensity in wireless communications with said base station;

reception quality information generation means for generating information representing a reception quality of the terminal on the basis of the signal reception intensity measured by said reception intensity measurement means;

noise power estimation means for estimating noise power of said spurious radiation wave in a frequency band used for the wireless communications with said base station, based on the signal transmission power set up by said transmission power setup means, the signal reception intensity measured by said reception intensity measurement means and a coefficient inherent to the terminal; and

when said detection means detects that said contactless communication function is started, said control means causes said reception quality information generating means to generate information on the reception quality taking account of said noise power estimated by said noise power estimation means, and causes the reception quality information and the detection information of said detection means to be transmitted, as said predetermined signal, from said communication means to said base station

5. The mobile wireless communication terminal according to claim 3, characterized in that:

when said detection means detects that said contactless communication function is started, said control means allows the detection information of said detection means to be transmitted as said predetermined signal from said communication means to said base station.

6. The mobile wireless communication terminal of according to claim 3, characterized by having:

transmission power setup means for setting up signal transmission power in accordance with the instruction from said base station;

reception intensity measurement means for measuring signal reception intensity in wireless communications with said base station;

reception quality information generation means for generating information representing a reception quality of the terminal on the basis of the signal reception intensity measured by said reception intensity measurement means;

noise power estimation means for estimating noise power of said spurious radiation wave in a frequency band used for the wireless communications with said base station, based on the signal transmission power set up by said transmission power setup means, the signal reception intensity measured by said reception intensity measurement means, and a coefficient inherent to the terminal, and characterized in that;

when said detection means detects that said contactless communication function is started, said control means causes said reception quality information generating means to generate information on the reception quality taking account of the noise power estimated by said noise power estimation means, and causes the reception quality information to be transmitted, as said predetermined signal, from said communication means to said base station.

7. The mobile wireless communication terminal according to claim 3, characterized by having:

instruction input acquisition means being capable of acquiring an instruction input from a user, characterized in that;

said detection means detects that said contactless communication function is started in response to a predetermined Instruction input by the user through said instruction input means.

8. The mobile wireless communication terminal according to claim 3, characterized in the:

said detection means detects that said contactless communication function is started, when detecting the carrier wave of said predetermined frequency.

9. The mobile wireless communication terminal according to claim 3, characterized in that:

said control means transmits said predetermined signal to the base station, receives the instruction to lower the transmission speed from the base station, controls said communication means, and lowers the transmission speed in the case of the wireless communications with the base station, then causes said contactless communication function to perform contactless communication.

10. A mobile wireless communication system having a mobile wireless communication terminal provided with a contactless communication function to perform contactless communication by using a carrier wave of a predetermined frequency, and a base station or performing wireless communications with the mobile wireless communication terminal, in which wireless communications between said mobile wireless communication terminal and the base station are performed by using a frequency band overlapping at least in part with a spurious radiation wave frequency range resulting from the carrier wave of said predetermined frequency, characterized in that:

said mobile wireless communication terminal generates, when detecting that said contactless communication function is started/ a predetermined signal, and transmits the predetermined signal to said base station;

said base station judges, on the basis of said predetermined signal from said mobile wireless communication terminal, whether or not it i necessary to lower a transmission speed used for the wireless communications with said mobile wireless communication terminal, and transmits an instruction to lower the transmission speed to the mobile wireless communication terminal when it judges that it is necessary to lower said transmission speed; and

said mobile wireless communication terminal lowers, when receiving the instruction to lower said transmission speed from said base station, the transmission speed used for the wireless communications with the base station.

11. The mobile wireless communication system according to claim 10, characterized in that:

said base station directs signal transmission power to said mobile wireless communication terminal,

said mobile wireless communication terminal estimates, when detecting that said contactless communication function is started, noise power of said spurious radiation wave in the frequency band used for the wireless communications with said base station, on the basis of the signal reception intensity in wireless communications with said base station/ the signal transmission power directed by said base station and a coefficient inherent to the terminal, generates information on the reception quality taking account of the estimated noise power, and transmits the reception quality information and the detection information on the starting of said contactless communication function, as said predetermined signal, to said base stations and

said base station compares, when receiving the information on said reception quality and said detection information from said mobile wireless communication terminal, said reception quality with a predetermined threshold value, and judges that it is necessary to lower the transmission speed with respect to said mobile phone terminal, in a case where said reception quality is equal to or less than the predetermined threshold value.

12. The mobile wireless communication system according to claim 10, characterized in that:

said mobile wireless communication terminal transmits, when detecting that said contactless communication function is started, the detection information on the starting of the contactless communication function to said base station as said predetermined signal, and

said base station judges, when receiving said detection information from said mobile wireless communication terminal, that it is necessary to lower the transmission speed with respect to said mobile phone terminal.

13. The mobile wireless communication system according to claim 10, characterized in that:

said base station directs signal transmission power to said mobile wireless communication terminal,

said mobile wireless communication terminal estimates, when detecting that said contactless communication function is started, noise power of said spurious radiation wave in the frequency band used for the wireless communications with said base station, on the basis of the signal reception intensity in wireless communications with said base station, the signal transmission power directed by said base station, and a coefficient inherent to the terminal, generates information on the reception quality taking account of the estimated noise power, and transmits the reception quality information as said predetermined signal, to said base station,

said base station compares said reception quality from said mobile wireless communication terminal with a predetermined threshold value, and judges that it is necessary to lower the transmission speed with respect to said mobile phone terminal, in a case where said reception quality is equal to or less than the predetermined threshold values.

14. The mobile wireless communication system according to claim 10, characterized in that:

said mobile wireless communication terminal detects that said contactless communication function is started in response to a predetermined instruction input from a user.

15. The mobile wireless communication system according to claim 10, characterized in that:

said mobile wireless communication terminal detects, when detecting the carrier wave of said predetermined frequency, that said contactless communication function is started.

16. The mobile wireless communication system according to claim 10 characterized in that:

said mobile wireless communication terminal transmits said predetermined signal to the base station, receives the instruction to lower the transmission speed from the base station, and lowers the transmission speed in the case of the wireless communications with said base station, then causes said contactless communication function to perform contactless communication.