Method of handover and route diversity in mobile radio communication

A method of handover in a mobile radio communication using a cellular system formed by a plurality of control base stations each of which is covering a cell within a service area of the system, a plurality of base stations each of which is covering a mini-cell within a cell area of the cell covered by each of the control base stations, wherein the plurality of base stations within a cell area of a control base station and the control base station form a ring topology, method comprising the steps of:

• providing a single directional loop transmission line by which a control base station and each base station are connected with neighboring base stations;
• transmitting a handover information through the loop transmission line, where the handover information is relayed by each base station from one of the neighboring base stations to another one of the neighboring base station such that the handover information is circulated through the loop transmission line in a predetermined direction;
• and
• carrying out the handover of a communication of a mobile station from one traffic channel of one base station to an idle traffic channel of another base station by using the handover information circulated through the loop transmission line when a mobile station moves from one mini-cell to another mini-cell.

A method of handover in a mobile radio communication using a cellular system formed by a plurality of base stations, in ring topology the method comprising the steps of:

• providing a loop transmission line by which each base station is connected with neighboring base stations;
• monitoring at a mobile station a receiving quality of each of the base stations via a control channel during idle periods of a currently used traffic channel and determining a destination base station for the handover;
• transmitting a handover information through the loop transmission line, where the handover information is relayed by each base station from one of the neighboring base stations to another one of the neighboring base station such that the handover information is circulated through the loop transmission line in a predetermined direction;
• and
• carrying out the handover of a communication of the mobile station from the currently used traffic channel of a currently used base station to an idle traffic channel of the destination base station determined by the mobile station by using the handover information circulated through the loop transmission line.