Radio relay station and control method

摘要

A relay node (200) transmits a terminal handover request, which requests permission for a terminal handover, or a relay station handover request, which requests permission for a relay station handover, to a radio base station (100A). When the relay node receives a handover instruction which instructs a relay station handover, the relay node carries out a relay handover; and when the relay node receives a handover instruction which instructs a terminal handover, the relay node transmits the handover instruction to at least one among a group of radio terminals (300E-300G).

主权项

1. A radio relay station, comprising:
a first communication unit configured to communicate with a radio base station or a different radio relay station as a connection destination; a second communication unit configured to communicate with at least one radio terminal; a relay unit configured to relay data to be exchanged between a connection destination of the first communication unit and the radio terminal; and a controller configured to control the first communication unit and the second communication unit, wherein the controller comprises: a handover request unit configured to control the first communication unit so that the first communication unit transmits a relay station handover request for executing a relay station handover in which the first communication unit switches the connection destination or a terminal handover request for executing a terminal handover in which the radio terminal switches a connection destination; a handover controller configured to control the first communication unit so that the first communication unit executes the relay station handover when the first communication unit receives a response message indicating that the relay station handover is allowed or instructed; and a handover instruction unit configured to control the second communication unit so that the second communication unit transmits a terminal handover instruction to the radio terminal when the first communication unit receives a response message indicating that the terminal handover is allowed or instructed, wherein the handover request unit is configured to control the first communication unit so that the first communication unit transmits the relay station handover request or the terminal handover request when a relay station load that is a load of a communication performed by the second communication unit with the radio terminal exceeds a load acceptable amount determined according to a load of a connection destination of the first communication unit or when it is predicted that the relay station load exceeds the load acceptable amount.