Broadcasting method for sending signal containing predetermined information and radio apparatus
AssigneeSanyo Electric Co., Ltd.
InventorsMakoto NAGAI, Ken NAKAOKA, Keisuke HIGUCHI
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Abstract
A control information extraction unit receives information on a frame that contains at least a plurality slots from an access control apparatus for controlling communications between radio apparatuses. The control information extraction unit generates a frame that contains at least a plurality of slots in such a manner as to synchronize with the frame corresponding to the received information. An estimation unit estimates empty slots in the plurality of slots generated. A selection unit selects, at random, at least one of the estimated. A modem unit and the like broadcast data using the selected slot.
Claims5
1-11. (canceled)
A terminal apparatus comprising:
- a receiving unit that receives, given a 100 msec frame in which a plurality of first periods and a second period are time division multiplexed, an OFDM packet signal from an access control apparatus in some of the first periods, the access control apparatus being capable of broadcasting an OFDM packet signal in the first periods and the second period being available for CSMA/CA communication between terminal apparatuses;
- and
- a transmitting unit that broadcasts, given a 100 msec frame in which a plurality of first periods and the second period are time division multiplexed, an OFDM packet signal in the second period,
- wherein the OFDM packet signal received by the receiving unit includes information on timing of some of the first periods in which the access control apparatus broadcasts an OFDM packet signal, and
- the transmitting unit performs carrier sensing and determines random timing of transmission.
The terminal apparatus according to claim 1, wherein the receiving unit establishes synchronization based on the received OFDM packet signal.
A communication method comprising:
- receiving, given a 100 msec frame in which a plurality of first periods and a second period are time division multiplexed, an OFDM packet signal from an access control apparatus in some of the first periods, the access control apparatus being capable of broadcasting an OFDM packet signal in the first periods and the second period being available for CSMA/CA communication between terminal apparatuses;
- and
- broadcasting, given a 100 msec frame in which a plurality of first periods and the second period are time division multiplexed, an OFDM packet signal in the second period,
- wherein the OFDM packet signal received in the receiving includes information on timing of some of the first periods in which the access control apparatus broadcasts an OFDM packet signal, and
- the transmitting performs carrier sensing and determines random timing of transmission.
Dependencies are inferred from the claim text.