Communications system and communications apparatus
First Claim
1. A communications system configured to execute data transmission between a transponder having no radio wave generating source thereof and a reader/writer, the communication system comprising:
- a service permission level notifier, included in the reader/writer, configured to transmit to the transponder a measurement of a service permission level of a signal received from the reader/writer by the transponder, the service permission level indicating a signal level required to be received at the transponder for permitting service acceptance by the transponder from the reader/writer, wherein the reader/writer is configured to set the service permission level and provide the service to the transponder;
a measuring unit, included in the transponder, configured to measure a received signal level of the signal received from the reader/writer; and
an access controller configured to determine in the transponder whether the received signal level from the reader/writer is at the service permission level to determine whether the reader/writer can read data associated with the service from the transponder and whether the reader/writer can write data associated with the service to the transponder,wherein a service entry sequence is provided in which the reader/writer notifies the transponder of a beacon frame at a predetermined time interval and the transponder returns a response frame in response to the beacon frame within a predetermined entry period after transmission of the beacon frame,the service permission level notifier notifying the transponder of a service permission level through a beacon frame to be transmitted by the reader/writer, andthe access controller determining whether a received signal level of the beacon frame received by the transponder from the reader/writer is at the service permission level to determine whether the reader/writer can read data associated with the service from the transponder and whether the reader/writer can write data associated with the service to the transponder.
1 Assignment
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Accused Products
Abstract
A communications system configured to execute data transmission between a transponder having no radio wave generating source thereof and a reader/writer is provided. The communications system includes, a service permission level notifier configured to tell a service permission level for associated with a received signal level for permitting service acceptance from the reader/writer to the transponder, and an access controller configured to determine in the transponder whether the received signal level from the reader/writer is at the notified service permission level to determine accessibility to the transponder from the reader/writer.
13 Citations
14 Claims
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1. A communications system configured to execute data transmission between a transponder having no radio wave generating source thereof and a reader/writer, the communication system comprising:
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a service permission level notifier, included in the reader/writer, configured to transmit to the transponder a measurement of a service permission level of a signal received from the reader/writer by the transponder, the service permission level indicating a signal level required to be received at the transponder for permitting service acceptance by the transponder from the reader/writer, wherein the reader/writer is configured to set the service permission level and provide the service to the transponder; a measuring unit, included in the transponder, configured to measure a received signal level of the signal received from the reader/writer; and an access controller configured to determine in the transponder whether the received signal level from the reader/writer is at the service permission level to determine whether the reader/writer can read data associated with the service from the transponder and whether the reader/writer can write data associated with the service to the transponder, wherein a service entry sequence is provided in which the reader/writer notifies the transponder of a beacon frame at a predetermined time interval and the transponder returns a response frame in response to the beacon frame within a predetermined entry period after transmission of the beacon frame, the service permission level notifier notifying the transponder of a service permission level through a beacon frame to be transmitted by the reader/writer, and the access controller determining whether a received signal level of the beacon frame received by the transponder from the reader/writer is at the service permission level to determine whether the reader/writer can read data associated with the service from the transponder and whether the reader/writer can write data associated with the service to the transponder. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A communications apparatus in a communications system configured to execute data transmission between a transponder having no radio wave generating source thereof and a reader/writer, the communications apparatus operating as the transponder and comprising:
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a communicator configured to execute, as the transponder, data transmission and reception with the reader/writer, the data transmission and reception including receiving a measurement of a service permission level of a signal received from the reader/writer, the service permission level indicating a signal level required to be received at the transponder for permitting service acceptance by the transponder from the reader/writer; a measuring unit configured to measure a received signal level of the signal received from the reader/writer; and a communications controller configured to control a communications operation performed by the communicator, wherein the communications controller sets the service permission level and determines whether the received signal level from the reader/writer is at the service permission level to determine whether the reader/writer can read data associated with the service from the transponder and whether the reader/writer can write data associated with the service to the transponder, wherein the communications system uses a service entry sequence in which the reader/writer notifies the transponder of a beacon frame at a predetermined time interval and the transponder returns a response frame in response to the beacon frame within a predetermined entry period after transmission of the beacon frame, and wherein the communications controller determines whether a received signal level of the beacon frame received by the transponder from the reader/writer is at the service permission level to determine whether the reader/writer can read data associated with the service from the transponder and whether the reader/writer can write data associated with the service to the transponder. - View Dependent Claims (9)
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10. A communications apparatus in a communications system configured to execute data transmission between a transponder having no radio wave generating source thereof and a reader/writer, the communications apparatus operating as the reader/writer, comprising:
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a communicator configured to execute, as the reader/writer, data transmission and reception with the transponder; and a communications controller configured to control a communications operation performed by the communicator, wherein the communications controller provides a service from the reader/writer to the transponder, transmits to the transponder a measurement of a service permission level of a signal received from the reader/writer by the transponder, the service permission level indicating a signal level required to be received at the transponder for permitting service acceptance by the transponder from the reader/writer, and sets the service permission level, wherein the communications system uses a service entry sequence in which the reader/writer notifies the transponder of a beacon frame at a predetermined time interval and the transponder returns a response frame in response to the beacon frame within a predetermined entry period after transmission of the beacon frame, and the communications controller transmits the set service permission level to the transponder by putting the service permission level onto the beacon frame. - View Dependent Claims (11)
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12. A communications system configured to execute data transmission between a transponder having no radio wave generating source thereof and a reader/writer, the communications system comprising:
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service permission level notifying means for transmitting to the transponder a measurement of a service permission level of a signal received from the reader/writer by the transponder, the service permission level indicating a signal level required to be received by the transponder for permitting service acceptance at the transponder from the reader/writer, wherein the reader/writer is configured to set the service permission level and provide the service to the transponder; measuring means, included in the transponder, for measuring a received signal level of the signal received from the reader/writer; and access control means for determining in the transponder whether the received signal level from the reader/writer is at the service permission level to determine whether the reader/writer can read data associated with the service from the transponder and whether the reader/writer can write data associated with the service to the transponder, wherein a service entry sequence is provided in which the reader/writer notifies the transponder of a beacon frame at a predetermined time interval and the transponder returns a response frame in response to the beacon frame within a predetermined entry period after transmission of the beacon frame, the service permission level notifying means notifying the transponder of a service permission level through a beacon frame to be transmitted by the reader/writer, and the access control means determining whether a received signal level of the beacon frame received by the transponder from the reader/writer is at the service permission level to determine whether the reader/writer can read data associated with the service from the transponder and whether the reader/writer can write data associated with the service to the transponder.
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13. A communications apparatus in a communications system configured to execute data transmission between a transponder having no radio wave generating source thereof and a reader/writer, the communications apparatus operating as the transponder and comprising:
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communication means for executing, as the transponder, data transmission and reception with the reader/writer, the data transmission and reception including receiving a measurement of a service permission level of a signal received from the reader/writer by the transponder, the service permission level indicating a signal level required to be received at the transponder for permitting service acceptance by the transponder from the reader/writer; measuring means for measuring a received signal level of the signal received from the reader/writer; and communications control means for controlling a communications operation done by the communication means, wherein the communications control means sets the service permission level and determines whether the received signal level from the reader/writer is at the service permission level to determine whether the reader/writer can read data associated with the service from the transponder and whether the reader/writer can write data associated with the service to the transponder, wherein the communications system uses a service entry sequence in which the reader/writer notifies the transponder of a beacon frame at a predetermined time interval and the transponder returns a response frame in response to the beacon frame within a predetermined entry period after transmission of the beacon frame, and wherein the communications control means determines whether a received signal level of the beacon frame received by the transponder from the reader/writer is at the service permission level to determine whether the reader/writer can read data associated with the service from the transponder and whether the reader/writer can write data associated with the service to the transponder.
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14. A communications apparatus in a communications system to execute data transmission between a transponder having no radio wave generating source thereof and a reader/writer, the communications apparatus operating as the reader/writer and comprising:
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communicator means for executing, as the reader/writer, data transmission and reception with the transponder; and communications control means for controlling a communications operation done by the communicator means, wherein the communications control means provides a service from the reader/writer to the transponder, transmits to the transponder a measurement of a service permission level of a signal received from the reader/writer by the transponder, the service permission level indicating a signal level required to be received at the transponder for permitting service acceptance by the transponder from the reader/writer, and sets the service permission level, wherein the communications system uses a service entry sequence in which the reader/writer notifies the transponder of a beacon frame at a predetermined time interval and the transponder returns a response frame in response to the beacon frame within a predetermined entry period after transmission of the beacon frame, and the communications control means transmits the set service permission level to the transponder by putting the service permission level onto the beacon frame.
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Specification