Handoff control system handoff control method, and storage medium storing handoff control program

A handoff control system for performing handoff processing for a terminal that moves across cells of a plurality of base stations while performing speech communication, comprising:

• measuring means for periodically measuring a reception signal strength in said terminal;
• calculation means for calculating the relative change amount of reception signal strength at measurement time intervals on the basis of the measurement result output from said measuring means;
• queue storage means storing, in advance, a plurality of queues to which priorities based on relative change amounts of reception signal strength are assigned;
• request processing means for, when said terminal generates a handoff request, distributing a call from said terminal to one of the queues on the basis of the relative change amount of reception signal strength in said terminal;
• and
• queue control means for, when an available channel is present in an adjacent cell to which said terminal, which generated the request, has moved, assigning the call, distributed into the queue according to the order based on the priority, to the available channel so that calls are processed in accordance with the order of the distribution in each queue, and
• wherein said terminal comprises said measuring means and transmission means for transmitting the measurement result obtained by said measuring means to said base station,
• said base station comprises said calculation means, said queue storage means, said request processing means, said queue control means, and interface means for notifying the handoff request from said terminal and the measurement result transmitted from said terminal to an adjacent base station,
• said calculation means calculates the relative change amount of reception signal strength at measurement time intervals on the basis of the measurement result notified through said interface means, and
• said request processing means distributes the call from said terminal, which generated the handoff request, on the basis the handoff request notified through said interface means and the relative change amount of reception signal strength output from said calculation means.

A handoff control method of performing handoff processing for a terminal that moves across cells of a plurality of base stations while performing speech communication, characterized by comprising the steps of:

• periodically measuring a reception signal strength in said terminal;
• calculating the relative change amount of measured reception signal strength at measurement time intervals;
• distributing calls from terminals which have generated handoff requests to a plurality of queues, to which priorities are assigned in advance, on the basis of the calculated relative change amounts of reception signal strength;
• monitoring the presence/absence of an available channel in an adjacent cell to which said terminal, which generated the handoff request, has moved;
• and
• when there is an available channel in the adjacent cell, assigning the call distributed into the queue to the available channel in the order based on priorities so that calls are processed in accordance with the order of the distribution in each queue;
• and
• wherein the step of distributing comprises the steps of:
• storing the relative change amount of reception signal strength from said base station at said terminal in advance;
• and
• when a handoff request is generated, distributing a call from said terminal, which has generated the handoff request, to a corresponding queue on the basis of the stored relative change amount of reception signal strength;
• and
• said method further comprising the step of setting higher priorities in advance in the increasing order of the calculated relative change amounts of reception signal strength.

A storage medium storing a handoff control program for performing handoff processing for a terminal that moves across cells of a plurality of base stations while performing speech communication, wherein the handoff control program is executable on a computer to cause the computer to perform the steps of:

• periodically measuring, in said terminal, a reception signal strength from said base station;
• calculating the relative change amount of measured reception signal strength at measurement time intervals;
• distributing calls from terminals which have generated handoff requests to a plurality of queues, to which priorities based on the relative change amounts are assigned in advance, on the basis of the calculated relative change amounts of reception signal strength;
• monitoring the presence/absence of an available channel in an adjacent cell to which said terminal, which generated the handoff request, has moved;
• and
• when there is an available channel in the adjacent cell, assigning the call distributed into the queue to the available channel in the order based on priorities, so that calls are processed in accordance with the order of the distribution in each queue,
• wherein the step of distributing comprises the steps of:
• storing the relative change amount of reception signal strength from said base station at said terminal in advance;
• and
• when a handoff request is generated, distributing a call from said terminal, which has generated the handoff request, to a corresponding queue on the basis of the stored relative change amount of reception signal strength;
• and
• said method further comprising the step of setting higher priorities in advance in the increasing order of the calculated relative change amounts of reception signal strength.