MASTER STATION IN COMMUNICATIONS SYSTEM AND ACCESS CONTROL METHOD

• US 20120099559A1
• Filed: 12/27/2011
• Published: 04/26/2012
• Est. Priority Date: 08/06/2003
• Status: Active Grant

• Current Assignee: Kensuke Yoshizawa, Shinichiro Ohmi, Tsuyoshi Yamaguchi
• Original Assignee: Kensuke Yoshizawa, Shinichiro Ohmi, Tsuyoshi Yamaguchi
• Inventors: YOSHIZAWA, Kensuke, Ohmi, Shinichiro, Yamaguchi, Tsuyoshi
• Granted Patent: US 8,885,594 B2
• Time in Patent Office: Days
• US Class Current: 370/330
• CPC Class Codes: H04W 28/04 Error control
• CPC Class Codes: H04W 48/08 Access restriction or access information delivery, e.g. discovery data delivery signalling during connection H04W76/00
• CPC Class Codes: H04W 72/00 Local resource management
• CPC Class Codes: H04W 72/04 Wireless resource allocation
• CPC Class Codes: H04W 74/08 Non-scheduled access, e.g. ALOHA hybrid access H04W74/02
• CPC Class Codes: H04W 84/20 Master-slave selection or change arrangements

Abstract

A communication band is divided into: a beacon period in which every master station transmits a beacon packet in competition with one another; a guaranteed-band period (e.g., a TDMA period or an FDMA period) in which only a specific permitted station is allowed access; and a CSMA period in which every station is allowed access in competition with one another. Plural master stations exchange information of a communication band used in the guaranteed-band period with each other, and based on the respective information, a communication band available to the master station'"'"'s own communications system in the guaranteed-band period is calculated.

Claims

1-13. -13. (canceled)

14. A control station in a first group controlling a communication of a slave station in the first group, the first group sharing a bandwidth with a second group including another slave station, and another control station controlling a communication of the other slave station in the second group, the control station comprising:

a bandwidth management section configured to specify a contention period and a non-contention period allocated periodically, the contention period being a period, shared with the second group, during which any station in the first group or the second group is allowed to transmit a frame in contention with other stations, and the non-contention period being a period including a first non-contention period for the first group and a second non-contention period for the second group,

wherein the bandwidth management section allocates a time slot in the first noncontention period to the slave station in the first group.

15. A control method used in a control station in a first group controlling a communication of a slave station in the first group, the first group sharing a bandwidth with a second group including another slave station, and another control station controlling a communication of the other slave station in the second group, the control method comprising:

specifying a CSMA period and a TDMA period allocated periodically, the CSMA period being a period, shared with the second group, during which any station in the first group or the second group is allowed to transmit a signal in contention with other stations, and the TDMA period being a period including a first TDMA period for the first group and a second TDMA period for the second group, and

allocating a time slot in the first TDMA period to the slave station in the first group.