US 10,477,456 B2 · Terminal apparatus and base station apparatus

Abstract

An object of the present invention is to protect the communication of a legacy terminal while achieving favorable communication rendering the CCA level of a CCA-variable terminal apparatus variable in an environment, premised on CSMA/CA, where the CCA-variable terminal apparatus and a legacy terminal apparatus coexist. A terminal apparatus for performing wireless communication with a base station apparatus includes: a receiving unit that receives a radio signal transmitted from the base station apparatus; a CCA-variable channel information processing unit that acquires first CCA-variable channel instruction information contained in the radio signal and containing information regarding a range of a CCA level that is available on a certain channel and that is used for clear channel assessment; and a higher layer unit that selects, according to the first CCA-variable channel instruction information, a channel to be used.

Claims8

Dependent claims

A base station apparatus for performing communication with a terminal apparatus, comprising:

a signal detector that performs carrier sense to assess the received signal power to confirm a status of use of a channel using either one of a first threshold and a second threshold;
and
a transmitting unit that transmits data to the terminal apparatus by using carrier aggregation, using a plurality of channels,
wherein the signal detector performs carrier sense using the first threshold in a case where a communication apparatus other than the terminal apparatus that is configured to belong to the base station apparatus is present in the channel trying to perform the carrier sense, and performs the carrier sense using the second threshold in a case where the communication apparatus other than the terminal apparatus that is configured to belong to the base station apparatus is not present therein,
the transmitting unit transmits the data after the signal detector has performed a first carrier sense according to a duration that is associated with a contention window in at least one of the plurality of channels, and
the second threshold is larger in value than the first threshold.

3 more elements

Dependencies are inferred from the claim text.

Terminal apparatus and base station apparatus

Life of this patent

Terminal apparatus and base station apparatus

Life of this patent

Abstract

Claims8