RADIO RELAY STATION AND CONTROL METHOD
First Claim
Patent Images
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 the 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, whereinthe controller comprises;
a handover request unit configured to control the first communication unit so that the first communication unit transmits a handover request for executing a relay station handover in which the first communication units switches the connection destination, 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 allowable amount determined according to a load of the connection destination of the first communication unit or when it is predicted that the relay station load exceeds the load allowable amount; and
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.
1 Assignment
0 Petitions
Accused Products
Abstract
When a relay station load, which is the load of communications with radio terminals (300E-300G), of a relay node (200) exceeds a load allowable amount, which is determined according to the load of a radio base station (100A), the relay node transmits a handover request, which requests permission for a relay handover, to the radio base station (100A) and performs a relay handover if the relay node receives a handover command which instructs a relay handover.
-
Citations
21 Claims
-
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 the 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 handover request for executing a relay station handover in which the first communication units switches the connection destination, 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 allowable amount determined according to a load of the connection destination of the first communication unit or when it is predicted that the relay station load exceeds the load allowable amount; and 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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
-
-
10. A control method for a radio relay station which comprises 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, and a relay unit configured to relay data to be exchanged between the connection destination of the first communication unit and the radio terminal, the control method comprising:
-
controlling the first communication unit so that the first communication unit transmits a handover request for executing a relay station handover in which the first communication units switches the connection destination, 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 allowable amount determined according to a load of the connection destination of the first communication unit or when it is predicted that the relay station load exceeds the load allowable amount, and controlling 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.
-
-
11. 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 handover request for executing a terminal handover for switching a connection destination, 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 allowable 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 allowable amount; and a handover instruction unit configured to control the second communication unit, when the first communication unit receives a response message indicating that the terminal handover is allowed or instructed, so that the second communication unit transmits a terminal handover instruction corresponding to the received response message to the radio terminal. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
-
-
21. A control method for a radio relay station which comprises 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, and a relay unit configured to relay data to be exchanged between a connection destination of the first communication unit and the radio terminal, the control method comprising:
-
controlling the first communication unit so that the first communication unit transmits a handover request for executing a terminal handover for switching the connection destination, 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 allowable amount determined according to a load of the connection destination of the first communication unit or when it is predicted that the relay station load exceeds the load allowable amount, and controlling the second communication unit, when the first communication unit received a response message indicating that the terminal handover is allowed or instructed, so that the second communication unit transmits a terminal handover instruction corresponding to the received response message.
-
Specification