Broadcasting method and access control apparatus
First Claim
Patent Images
1. An access control apparatus for controlling communications between terminal apparatuses, the access control apparatus comprising:
- a detecting unit configured to detect a predetermined slot from among a plurality of slots, wherein a frame containing a plurality of slots and periods is repeated, and CSMA/CA communication is used between terminal apparatuses in the periods of the frame; and
a broadcasting unit configured to broadcast information on the predetermined slot detected by said detecting unit, whereinthe access control apparatus is provided separately from terminal apparatuses,the access control apparatus is configured to control the communications between the terminal apparatuses without directly designating for the terminal apparatuses a slot that is used for data communication even when the terminal apparatuses perform data communication, andthe detecting unit is configured not to detect the predetermined slot in the periods of the frame other than the plurality of slots, but allows the terminal apparatuses to perform the CSMA/CA communication in the periods in which the CSMA/CA communication is used between terminal apparatuses.
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Accused Products
Abstract
It is specified that a frame containing at least the plurality of slots is repeated. A detecting unit detects a slot usable in the communications between terminal apparatuses, from among a plurality of slots. A modem unit and an RF unit broadcast the information on the detected slot. A power measuring unit in the detecting unit measures the respective received powers of the plurality of slots, and an empty slot identifying unit identifies a slot whose received power is less than a threshold value.
11 Citations
11 Claims
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1. An access control apparatus for controlling communications between terminal apparatuses, the access control apparatus comprising:
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a detecting unit configured to detect a predetermined slot from among a plurality of slots, wherein a frame containing a plurality of slots and periods is repeated, and CSMA/CA communication is used between terminal apparatuses in the periods of the frame; and a broadcasting unit configured to broadcast information on the predetermined slot detected by said detecting unit, wherein the access control apparatus is provided separately from terminal apparatuses, the access control apparatus is configured to control the communications between the terminal apparatuses without directly designating for the terminal apparatuses a slot that is used for data communication even when the terminal apparatuses perform data communication, and the detecting unit is configured not to detect the predetermined slot in the periods of the frame other than the plurality of slots, but allows the terminal apparatuses to perform the CSMA/CA communication in the periods in which the CSMA/CA communication is used between terminal apparatuses.
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2. An access control apparatus for controlling communications between terminal apparatuses, the access control apparatus comprising:
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a detecting unit configured to detect an empty slot usable in the communications between the terminal apparatuses, from among a plurality of slots, wherein a frame containing a plurality of slots and periods is repeated, and CSMA/CA communication is used between terminal apparatuses; and a broadcasting unit configured to broadcast information on the empty slot detected by said detecting unit, wherein the access control apparatus is provided separately from terminal apparatuses, the access control apparatus is configured to control the communications between the terminal apparatuses without directly designating for the terminal apparatuses a slot that is used for data communication even when the terminal apparatuses perform data communication, and the detecting unit is configured not to detect the empty slot in the periods of the frame other than the plurality of slots, but allows the terminal apparatuses to perform the CSMA/CA communication in the periods in which the CSMA/CA communication is used between terminal apparatuses. - View Dependent Claims (3, 4, 5)
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6. An access control apparatus for controlling communications between terminal apparatuses, the access control apparatus comprising:
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a detecting unit configured to detect a collision slot, in which a collision has occurred due to duplicate transmission of signals from a plurality of terminal apparatuses, wherein a frame containing a plurality of slots and periods is repeated, CSMA/CA communication is used between terminal apparatuses in the periods of the frame, and the terminal apparatuses communicate with each other using a predetermined slot; and a broadcasting unit configured to broadcast information on the slot detected by said detecting unit, wherein the access control apparatus is provided separately from terminal apparatuses, the access control apparatus is configured to the control the communications between the terminal apparatuses without directly designating for the terminal apparatuses a slot that is used for data communication even when the terminal apparatuses perform data communication, and the detecting unit is configured not to detect the collision slot in the periods of the frame other than the plurality of slots, but allows the terminal apparatuses to perform the CSMA/CA communication in the periods in which the CSMA/CA communication is used between terminal apparatuses. - View Dependent Claims (7, 8)
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9. A broadcasting method employed in an access control apparatus for controlling communications between terminal apparatuses, the method comprising:
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detecting a predetermined slot from among a plurality of slots, wherein a frame containing a plurality of slots and periods is repeated, and CSMA/CA communication is used between terminal apparatuses in the periods of the frame; and broadcasting information on the detected predetermined slot, wherein the access control apparatus is provided separately from terminal apparatuses, the access control apparatus is configured to control the communications between the terminal apparatuses without directly designating for the terminal apparatuses a slot that is used for data communication even when the terminal apparatuses perform data communication, and the detecting does not detect the predetermined slot in the periods of the frame other than the plurality of slots, but allows the terminal apparatuses to perform the CSMA/CA communication in the periods in which the CSMA/CA communication is used between terminal apparatuses.
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10. A broadcasting method employed in an access control apparatus for controlling communications between terminal apparatuses, the method comprising:
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detecting an empty slot usable in the communications between the terminal apparatuses, from among a plurality of slots, wherein a frame containing a plurality of slots and periods is repeated, and CSMA/CA communication is used between terminal apparatuses in the periods of the frame; and broadcasting information on the detected empty slot, wherein the access control apparatus is provided separately from terminal apparatuses, the access control apparatus is configured to control the communications between the terminal apparatuses without directly designating for the terminal apparatuses a slot that is used for data communication even when the terminal apparatuses perform data communication, and the detecting does not detect the empty slot in the periods of the frame other than the plurality of slots, but allows the terminal apparatuses to perform the CSMA/CA communication in the periods in which the CSMA/CA communication is used between terminal apparatuses.
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11. A broadcasting method employed in an access control apparatus for controlling communications between terminal apparatuses, the method comprising:
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detecting a collision slot, in which a collision has occurred due to duplicate transmission of signals from a plurality of terminal apparatuses, wherein a frame containing a plurality of slots and periods is repeated, CSMA/CA communication is used between terminal apparatuses in the periods of the frame, and the terminal apparatuses communicated with each other using a predetermined slot; and broadcasting information on the detected collision slot, wherein the access control apparatus is provided separately from terminal apparatuses, the access control apparatus is configured to control the communications between the terminal apparatuses without directly designating for the terminal apparatuses a slot that is used for data communication even when the terminal apparatuses perform data communication, and the detecting does not detect the collision slot in the periods of the frame other than the plurality of slots, but allows the terminal apparatuses to perform the CSMA/CA communication in the periods in which the CSMA/CA communication is used between terminal apparatuses.
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Specification