Patent ID: 11968731
Assignee: FUJITSU LIMITED
Field: Digital communication (Electrical engineering)
Classification: CPC H | IPC H

Claim 8:
9. A wireless communication system comprising:
a first wireless communication apparatus;
a second wireless communication apparatus that operates in an idle mode; and
a third wireless communication apparatus that operates in the idle mode or a connection mode,
wherein the second wireless communication apparatus includes
a first communication circuit configured to perform wireless communication via a first communication channel that is a Device-to Device (D2D) communication channel directly between the second wireless communication apparatus and the third wireless communication apparatus, and wireless communication via a second communication channel between the second wireless communication apparatus and the first wireless communication apparatus, the second communication channel being a cellular communication channel connected to a network of the wireless communication system via the first communication apparatus, wherein the second wireless communication apparatus maintains an idle mode via the second communication channel when not in a connected mode via the second communication channel during a period of wireless communication with the third wireless communication apparatus via the first communication channel, and
a first control circuit configured to perform first processing when a line disconnection is detected after a first state continues for a predetermined time, the first state being a state where a quality of the first communication channel is poorer than a prescribed quality in a case where the wireless communication apparatus operates in the idle mode via the second communication channel during the period the wireless communication apparatus performs communication with the third wireless communication apparatus via the first communication channel, the first processing including establishing the second communication channel with the first wireless communication apparatus,

wherein the third wireless communication apparatus includes:
a second communication circuit configured to perform, via a second communication channel, wireless communication via the first communication channel between the third communication apparatus and the second wireless communication apparatus, and wireless communication via the second communication channel between the third communication apparatus and the first wireless communication apparatus, and

wherein the first wireless communication apparatus includes:
a third communication circuit configured to perform wireless communication with the second wireless communication apparatus and the third wireless communication apparatus via a second communication channel, and
a third control circuit configured to perform second processing when a line disconnection is detected after a second state continues for a predetermined time, the second state being a state where a quality of the first communication channel is poorer than a prescribed quality in a case where the second wireless communication apparatus communicates with the third wireless communication apparatus via the first communication channel, the second processing including establishing the second communication channel with the second wireless communication apparatus.