Radio communication system and radio communication apparatus

• US 20090237252A1
• Filed: 02/24/2009
• Published: 09/24/2009
• Est. Priority Date: 03/24/2008
• Status: Abandoned Application

• Current Assignee: Fujitsu Limited
• Original Assignee: Fujitsu Limited
• Inventors: Yamada, Isamu, Shiotsu, Shinichi, Itasaki, Akira, Inano, Satoshi
• Application Number:
  US12/379,542
• Publication Number:
  US 20090237252A1
• Time in Patent Office: Days
• US Class Current: 340/572.100
• CPC Class Codes: G06K 19/0707 the arrangement being capable of collecting energy from external energy sources, e.g. thermocouples, vibration, electromagnetic radiation G06K19/0702 takes precedence
• CPC Class Codes: G06K 19/0712 the arrangement being capable of triggering distinct operating modes or functions dependent on the strength of an energy or interrogation field in the proximity of the record carrier active means for hindering electromagnetic reading or writing G06K19/07336
• CPC Class Codes: G06K 19/0723 the record carrier comprising an arrangement for non-contact communication, e.g. wireless communication circuits on transponder cards, non-contact smart cards or RFIDs
• CPC Class Codes: G06K 7/0008 General problems related to the reading of electronic memory record carriers, independent of its reading method, e.g. power transfer

Abstract

The radio communication system includes a radio communication apparatus having: a communication part which transmits a request signal requesting a response to a radio tag; and a radio tag which transmits a response signal in response to a reception of the request signal from the radio communication apparatus. The radio communication apparatus has an intermittent control part which makes the communication part transmit the request signal at an interval of a given stop time during a given operation time.

Claims

1. A radio communication system comprising:

a radio communication apparatus having a communication part for transmitting a request signal requesting a response to a radio tag; and

a radio tag which transmits a response signal in response to the reception of the request signal from the radio communication apparatus,

wherein the radio communication apparatus comprises an intermittent control part which makes the communication part transmit the request signal at an interval of a given stop time during a given operation time.

2. The radio communication system according to claim 1, wherein the radio tag comprises a detecting part for detecting the presence of the request signal at a given starting interval, and the operation time in the radio communication apparatus is set to be longer than the starting interval in the radio tag.

3. The radio communication system according to claim 1, wherein the radio communication apparatus uses a battery as an electric power source.

4. A radio communication system comprising:

a radio communication apparatus having a communication part for transmitting a request signal requesting a response to a radio tag; and

a radio tag which transmits a response signal in response to the reception of the request signal from the radio communication apparatus,

wherein the radio communication apparatus comprises;

a remaining amount detecting part for detecting a remaining amount of a radio communication apparatus battery which is an electric power source of the radio communication apparatus;

a comparing part for comparing remaining amount information, indicating the detected remaining amount, with a reference value; and

an intermittent control part which makes the communication part continuously transmit the request signal when it is determined that the value indicated by the remaining amount information is not less than the reference value based on the comparison by the comparing part, and makes the communication part transmit the request signal at an interval of a given stop time during a given operation time when it is determined that the value indicated by the remaining amount information is less than the reference value.

5. The radio communication system according to claim 4, wherein the radio tag comprises:

a tag battery remaining amount detecting part for detecting a remaining amount of a radio tag battery which is an electric power source of the radio tag, the radio tag transmitting tag battery remaining amount information, indicating the detected remaining amount, to the radio communication apparatus, and

the comparing part in the radio communication apparatus performs comparison using a value according to the tag battery remaining amount information received from the radio tag as the reference value.

6. The radio communication system according to claim 5, wherein the communication part in the radio communication apparatus transmits remaining amount information, indicating the remaining amount detected by the remaining amount detecting part, to the radio tag, and

the radio tag comprises:

a comparing part for comparing the tag battery remaining amount, detected by the tag battery remaining amount detecting part, with the remaining amount indicated by the remaining amount information received from the radio communication apparatus; and

a detecting part which continuously detects the presence of the request signal when it is determined that the tag battery remaining amount detected by the tag battery is not less than the remaining amount indicated by the received remaining amount information based on the comparison by the comparing part, and detects the presence of the request signal at an interval of a given stop time during a given operation time when it is determined that the tag battery remaining amount detected by the tag battery is less than the value according to the received remaining amount information.

7. The radio communication system according to claim 4, wherein the comparing part in the radio communication apparatus obtains a difference or a ratio between the value indicated by the remaining amount information and the reference value, and the intermittent control part sets the stop time and the operation time based on the difference or the ratio obtained by the comparing part.

8. The radio communication system according to claim 4, wherein the remaining amount information indicating the remaining amount detected by the remaining amount detecting part is a remaining operable time calculated based on a percentage of the remaining amount to a given amount or based on the remaining amount.

9. A radio communication system comprising:

a radio communication apparatus having a communication part for transmitting a request signal requesting a response to a radio tag; and

a radio tag which transmits a response signal in response to the reception of the request signal from the radio communication apparatus,

wherein the radio tag comprises;

a tag battery remaining amount detecting part for detecting a remaining amount of a radio tag battery which is an electric power source of the radio tag;

a comparing part for comparing tag battery remaining amount information, indicating the detected remaining amount, with a reference value; and

a detecting part which continuously detects the presence of the request signal when it is determined that the value indicated by the tag battery remaining amount information is not less than the reference value based on the comparison by the comparing part, and detects the presence of the request signal at an interval of a given stop time during a given operation time when it is determined that the value indicated by the tag battery remaining amount information is less than the reference value.

10. A radio communication apparatus comprising:

a communication part for performing radio communication with another apparatus;

a remaining amount detecting part for detecting a remaining amount of a battery which is an electric power source;

a comparing part for comparing remaining amount information, indicating a value based on the detected remaining amount, with a reference value; and

an intermittent control part which makes the communication part perform continuous communication when it is determined that the value indicated by the remaining amount information is not less than the reference value based on the comparison by the comparing part, and makes the communication part perform communication at an interval of a given stop time during a given operation time when it is determined that the value indicated by the remaining amount information is less than the reference value.

11. A machine-readable medium comprising machine-executable instructions that cause a radio-communication apparatus to execute:

detecting a remaining amount of a radio communication apparatus battery which is an electric power source of the radio communication apparatus;

comparing remaining amount information, indicating the detected remaining amount, with a reference value;

transmitting continuously the request signal when it is determined that the value indicated by the remaining amount information is not less than the reference value based on the comparison; and

transmitting the request signal at an interval of a given stop time during a given operation time when it is determined that the value indicated by the remaining amount information is less than the reference value.