RADIO TERMINAL AND RADIO COMMUNICATION METHOD

摘要

A radio terminal according to a present invention comprising a communication judgment unit (131) configured to judge whether or not the direct communication with the radio base station is possible to continue; a message processor (132) configured to transmit an inquiry message inquiring whether or not a direct communication with the radio base station is possible, to a lower-level radio terminal in the tree structure network, when the continuation judgment unit judges that the direct communication with the radio base station is not possible to continue; and a master manager configured to register the lower-level radio terminal as an upper-level radio terminal in the tree structure network, upon receipt of a response message indicating that a direct communication with the radio base station is possible, from the lower-level radio terminal.

主权项

1. A system comprising:
a first device which is a master directly communicating with a radio base station; and a second device which is a slave communicating with the first device, wherein the first device transmits a first message inquiring whether a direct communication with a radio base station is possible when the first device determines that a direct communication with a radio base station is impossible, the second device performs a search upon a receipt of the first message, the first device transmits a second message for causing a direct communication with a radio base station so as to interchange a relationship between a master and a slave, based on a result of the search, the second device performs a direct communication with a radio base station upon a receipt of the second message for causing the direct communication.