NOTIFYING METHOD, AND ACCESS CONTROL DEVICE

• US 20110134788A1
• Filed: 07/31/2009
• Published: 06/09/2011
• Est. Priority Date: 07/31/2008
• Status: Active Grant

• Current Assignee: Sanyo Electric Company Limited (Panasonic Holdings Corporation)
• Original Assignee: Sanyo Electric Company Limited (Panasonic Holdings Corporation)
• Inventors: Mizuguchi, Takao, Higuchi, Keisuke, Nakaoka, Ken
• Granted Patent: US 8,811,204 B2
• Time in Patent Office: Days
• US Class Current: 370/252
• CPC Class Codes: H04L 27/0006 Assessment of spectral gaps suitable for allocating digitally modulated signals, e.g. for carrier allocation in cognitive radio for spectrum sharing between different networks H04W16/14
• CPC Class Codes: H04L 5/006 Quality of the received signal, e.g. BER, SNR, water filling
• CPC Class Codes: H04L 5/0091 Signaling for the administration of the divided path
• CPC Class Codes: H04W 74/002 Transmission of channel access control information
• CPC Class Codes: H04W 74/0816 with collision avoidance

Abstract

It is specified in a manner such that a frame containing a first period formed by a plurality of slots and a second period having a predetermined length is repeated. A detecting unit detects a slot, which is usable for the communications between a plurality of other terminal apparatuses, from among a plurality of slots in the first period of a frame containing the first period and the second period. A modem unit and an RF unit broadcast information on the detected slot.

Claims

1. An access control apparatus for controlling communications between terminal apparatuses, the access control apparatus comprising:

a detecting unit configured to detect a slot, which is usable for the communications between terminal apparatuses, from among a plurality of slots in a first period of a frame containing the first period and a second period, wherein it is specified in a manner such that the frame containing the first period formed by the plurality of slots and the second period having a predetermined length is repeated; and

a broadcasting unit configured to broadcast information on the slot detected by said detecting unit.

2. An access control apparatus according to claim 1, further comprising a decision unit configured to determine the length of the first period,

wherein said broadcasting unit broadcasts information on the length of the first period determined by said decision unit as well as the information on the slot.

3. An access control apparatus according to claim 2, further comprising a measurement unit configured to measure the received power of signal in the communications between terminal apparatuses, over at least part of the frame,

wherein said decision unit determines the length of the first period according to the received power measured by said measurement unit.

4. An access control apparatus according to claim 2, wherein said decision unit determines the length of the first period according to the ratio of the number of slots in the first period to the number of slots detected by said detecting unit.

5. An access control apparatus for controlling communications between terminal apparatuses, the access control apparatus comprising:

a detecting unit configured to detect a slot, which is usable for the communications between terminal apparatuses, from among a plurality of slots in a first period of a frame containing the first period and a second period, wherein it is specified in a manner such that the frame containing the first period formed by the plurality of slots and the second period having a predetermined length is repeated; and

a broadcasting unit configured to broadcast information on the slot detected by said detecting unit,

wherein said broadcasting unit broadcasts information on a terminal apparatus which is to use the plurality of slots in the first period, of a frame containing the first period and a second period, as well as the information on the slot.

6. An access control apparatus according to claim 5, further comprising a decision unit configured to a threshold value for a received power when the terminal apparatus receives the information broadcast from said broadcasting unit,

wherein said broadcasting unit broadcasts the threshold value determined by said decision unit, as the information on a terminal apparatus which is to use the plurality of slots in the first period of a frame containing the first period and the second period, and

wherein said decision unit causes a terminal apparatus, whose received power is greater than the threshold value, to use any of the plurality of slots in the first period of a frame containing the first period and the second period.

7. An access control apparatus according to claim 5, further comprising a decision unit configured to determine an area within which the terminal apparatus, which is to use the plurality of slots in the first period of a frame containing the first period and the second period, is included,

wherein said broadcasting unit broadcasts information on the area determined by said decision unit, as the information on a terminal apparatus which is to use the plurality of slots in the first period of a frame containing the first period and the second period.

8. An access control apparatus according to claim 5, wherein said access control apparatus causes a terminal apparatus to broadcast information on the prohibition of transmission at least in the first period,

said terminal apparatus having received the information, broadcast from said broadcasting unit, on a terminal apparatus which is to use the plurality of slots in the first period of a frame containing the first period and the second period.

9. A broadcasting method employed in an access control apparatus for controlling communications between terminal apparatuses, the method comprising:

detecting a slot, which is usable for the communications between terminal apparatuses, from among a plurality of slots in a first period of a frame containing the first period and a second period, wherein it is specified in a manner such that the frame containing the first period formed by the plurality of slots and the second period having a predetermined length is repeated; and

broadcasting information on the slot detected.

10. A broadcasting method employed in an access control apparatus for controlling communications between terminal apparatuses, the method comprising:

detecting a slot, which is usable for the communications between terminal apparatuses, from among a plurality of slots in a first period of a frame containing the first period and a second period, wherein it is specified in a manner such that the frame containing the first period formed by the plurality of slots and the second period having a predetermined length is repeated; and

broadcasting information on the slot detected,

wherein said broadcasting broadcasts information on a terminal apparatus which is to use the plurality of slots in the first period, of a frame containing the first period, and the second period as well as the information on the slot.