COMMUNICATION APPARATUS, CONTROL METHOD FOR COMMUNICATION APPARATUS, AND COMMUNICATION SYSTEM
First Claim
1. A communication apparatus that operates in a network as one of a master device and a slave device, comprising:
- a requesting unit that makes a network reconstruction request to another communication apparatus;
a determination unit that determines whether the communication apparatus is to newly become the master device or the slave device based on the response to the request by the requesting unit; and
a setting unit that sets a standby time until start of an operation for deciding on a new master device, based on the determination by the determination unit.
1 Assignment
0 Petitions
Accused Products
Abstract
In a system that performs communication between master and slave, the device better suited as the master device is not always the master device, since the device that initially constructs the network becomes the master device. A device that enters the network later transmits a restart request on detecting the master device, and if a restart permission is received, the device transfers to a restart state and transmits a master inquiry before the device that was the master device up until that point. Thus, a device that newly enters a network is able to operate as the master device even if a master device already exists in the network.
-
Citations
17 Claims
-
1. A communication apparatus that operates in a network as one of a master device and a slave device, comprising:
-
a requesting unit that makes a network reconstruction request to another communication apparatus; a determination unit that determines whether the communication apparatus is to newly become the master device or the slave device based on the response to the request by the requesting unit; and a setting unit that sets a standby time until start of an operation for deciding on a new master device, based on the determination by the determination unit. - View Dependent Claims (2, 4, 5, 6, 7, 8, 10, 11, 14, 16, 17)
-
-
3. (canceled)
-
9. A communication apparatus that operates in a network as one of a master device and a slave device, comprising:
-
a reception unit that receives a network reconstruction request; a determination unit that determines whether the communication apparatus is to newly become the master device or the slave device, based on result of the reception by the reception unit; and a setting unit that sets a standby time until start of an operation for deciding on a new master device, based on the determination by the determination unit.
-
-
12. A control method for a communication apparatus, comprising:
-
a requesting step of making a network reconstruction request to another communication apparatus; a determination step of determining whether the communication apparatus is to newly become the master device or the slave device based on the response to the request in the requesting step; and a setting step of setting a standby time until start of an operation for deciding on a new master device, based on the result of the determination in the determination step.
-
-
13. A communication system composed of communication apparatuses that operate as a master device or a slave device,
the slave device comprising: -
a requesting unit that makes a network reconstruction request to the master device; and a setting unit that sets a standby time until the start of an operation for deciding on a new master device, based on the response to the request, and the master device comprising; a reception unit that receives the network reconstruction request; and a setting unit that sets a standby time until the start of an operation for deciding on a new master device, based on the result of the reception by the reception unit.
-
-
15. A control method for a communication apparatus, comprising:
-
a reception step of receiving a network reconstruction request; a determination step of determining whether the communication apparatus is to newly become the master device or the slave device, based on result of the reception in the reception step; and a setting step of setting a standby time until start of an operation for deciding on a new master device, based on the result of the determination in the determination step.
-
Specification