Wireless communication system, wireless communication apparatus, and wireless communication method

A first wireless communication apparatus comprising:

• a switching control unit,
• a wireless transmitting unit, and
• a wireless receiving unit,
• the first wireless communication apparatus is redundantly configured with second, third, and fourth wireless communication apparatuses and is connected to the second, third, and fourth wireless communication apparatuses via a radio link,
• the third and fourth wireless communication apparatuses being switched to one of an active mode and a standby mode so that at least one of the third and fourth wireless communication apparatuses is in the active mode, the third and fourth wireless communication apparatuses being configured such that when the third wireless communication apparatus is in the active mode and that the fourth wireless communication apparatus is in the standby mode, and when the third and fourth wireless communication apparatuses detect an occurrence of a failure of the radio link, if the failure of the radio link does not recover within a preset time, the fourth wireless communication apparatus switches to the active mode and the third wireless communication apparatus stays in the active mode,
• the first wireless communication apparatus is configured to be switched to one of the active mode and the standby mode, such that at least one of the first and second wireless communication apparatuses is in the active mode,
• the switching control unit is configured to detects an occurrence of a failure of the radio link, and is further configured to, when a failure of the radio, link is detected, and the failure of the radio link does not recover within a preset time, instruct the first wireless communication apparatus to remain in the active mode, and prepare a switch instruction to instruct the second wireless communication apparatus to switch to the active mode,
• the wireless transmitting unit being configured to, send the switch instruction to the second wireless communication apparatus,
• the wireless receiving unit being configured to receive the switching instruction from any one of the second, third, and fourth wireless communication apparatus, and
• the switching control unit, the wireless transmitting unit, and the wireless receiving unit being configured such that a transmission timing of the switch instruction, instructing the wireless communication apparatus in the active mode from among the third and fourth wireless communication apparatuses, in a case of the occurrence of the failure of the radio link is determined in advance to, cause the first and second wireless communication apparatuses to alternately transmit the switch instruction, and transmission timing of the switch instruction, instructing the wireless communication apparatus in the active mode from among the first and second wireless communication apparatuses, in a case of the occurrence of the failure of the radio link is determined in advance to, cause the third and fourth wireless communication apparatuses to alternately transmit the switch instruction.

A wireless communication method of a wireless communication system that comprises:

• first and second wireless communication apparatuses that are switched to one of an active mode and a standby mode so that at least one of the first and second wireless communication apparatuses is in the active mode;
• and
• third and fourth wireless communication apparatuses that are connected to the first and second wireless communication apparatuses via a radio link, and are switched to one of the active mode and the standby mode so that at least one of the third and fourth wireless communication apparatuses is in the active mod, the wireless communication method comprising:
• when the first wireless communication apparatus is in the active mode and the second wireless communication apparatus is in the standby mode, and when the first and second wireless communication apparatuses detect an occurrence of a failure of the radio link, if the failure of the radio link docs not recover within a preset time, transmitting a switch instruction via a radio link, the switch instruction instructing the second wireless communication apparatus to switch to the active mode and the first wireless communication apparatus to stay in the active mode,
• when the third wireless communication apparatus is in the active mode and the fourth wireless communication apparatus is in the standby mode, and when the third and fourth wireless communication apparatuses detect an occurrence of the failure of the radio link, if the failure of the radio link does not recover within a preset time, transmitting a switch instruction via a radio link, the switch instruction instructing the fourth wireless communication apparatus to switch to the active mode and the third wireless communication apparatus to stay in the active mode, and
• wherein a transmission timing of the switch instruction instructing the wireless communication apparatus in the active mode from among the third and fourth wireless communication apparatuses, in a case of the occurrence of the failure of the radio link is determined in advance to cause the first and second wireless communication apparatuses to alternately transmit the switch instruction, and transmission timing of the switch instruction, instructing the wireless communication apparatus in the active mode from among the first and second wireless communication apparatuses, in a case of the occurrence of the failure of the radio link is determined in advance to, cause the third and fourth wireless communication apparatuses to alternately transmit the switch instruction.

A wireless communication method of a first wireless communication apparatus comprising,

• a switching control unit,
• a wireless transmitting unit, and
• a wireless receiving unit,
• the first wireless communication apparatus is redundantly configured with second, third, and fourth wireless communication an apparatuses and is connected to the second, third, and fourth wireless communication apparatuses via a radio link,
• the method comprising:
• transmitting a switch instruction instructing the second wireless communication apparatus to switch to an active mode and the first wireless communication apparatus to stay in the active mode when the first wireless communication apparatus is in the active mode and the second wireless communication apparatus is in the standby mode, and when the first and second wireless communication apparatuses detect an occurrence of a failure of the radio link, if the failure of the radio link doe not recover within a Preset time,
• transmitting a switch instruction instructing the fourth wireless communication apparatus to switch to the active mode and the third wireless communication apparatus to stay in the active mode when the third wireless communication apparatus is in the active mode and the fourth wireless communication apparatus is in the standby mode, and when the third and fourth wireless communication apparatuses detect an occurrence of the failure of the radio link, if the failure of the radio link does not recover within a preset time, and
• wherein a transmission timing of the switch instruction instructing the wireless communication apparatus in the active mode from among the third and fourth wireless communication apparatuses, in a case of the occurrence of the failure of the radio link is determined in advance to cause the first and second wireless communication apparatuses to alternately transmit the switch instruction, and transmission timing of the switch instructions, instructing the wireless communication apparatus in the active mode from among the first and second wireless communication apparatuses, in a case of the occurrence of the failure of the radio link is determined in advance to cause the third and fourth wireless communication apparatuses to alternately transmit the switch instruction.