Mobile communication apparatus, fixed communicaton apparatus, communication system and communication method

A mobile communication apparatus for constructing a broad-band communication system with a plurality of first fixed communication apparatuses and constructing a closed-band communication system with a second fixed communication apparatus which is different from the plurality of first fixed communication apparatuses, comprising:

• first communication means for communicating with said plurality of first fixed communication apparatuses;
• second communication means for communicating with said second fixed communication apparatus;
• a memory for memorizing in advance a selection signal of the second fixed communication apparatus for selecting said second fixed communication apparatus;
• comparing means for comparing a signal from said plurality of first fixed communication apparatuses, which is constituted to transmit a selection signal of said second fixed communication apparatus, with a selection signal of said second fixed communication apparatus, which is obtained by being received by said first communication means, and with a selection signal of said second fixed communication apparatus, which is memorized in said memory;
• and
• a hand-off process means for conducting a hand-off to said second fixed communication apparatus from said first fixed communication apparatuses in accordance with the comparison result which is output from said comparing means.

A fixed communication apparatus for constructing a broad-band communication system with a plurality of first fixed communication apparatuses and a mobile communication apparatus and for constructing a closed-band communication system with said mobile communication apparatus and a second fixed communication apparatus, wherein said mobile communication apparatus conducts a hand-off between said plurality of first fixed communication apparatuses and between said plurality of first fixed communication apparatus and said second fixed communication apparatus, said plurality of first fixed communication apparatuses comprising:

• a hand-off controller for controlling a hand-off so that said mobile communication apparatus conducts a hand-off between said plurality of first fixed communication apparatuses;
• information holding means for holding a selection signal of the second fixed communication apparatus for selecting the second fixed communication apparatus required when said mobile communication apparatus conducts a hand-off to the second fixed communication apparatus;
• and
• hand-off information providing means for periodically transmitting a selection signal of said second fixed communication apparatus which is held in said information holding means.

A communication system for constructing a broad-band communication system with a plurality of first fixed communication apparatuses and a mobile communication apparatus and for constructing a closed-band communication system with said mobile communication apparatus and a second fixed communication apparatus, wherein said mobile communication apparatus, comprising:

• first communication means for communicating with said plurality of first fixed communication apparatuses;
• second communication means for communicating with said second fixed communication apparatus;
• a memory for memorizing a selection signal of said plurality of first fixed communication apparatus for selecting said plurality of first fixed communication apparatus, which is obtained by receiving at said first communication means a signal which is transmitted from said plurality of first fixed communication apparatuses when a hand-off is performed between said plurality of first fixed communication apparatuses and said second fixed communication apparatus;
• comparing means for comparing the selection signal and providing a comparison result of said plurality of first fixed communication apparatuses which is memorized in said memory with the selection signal of said plurality of first fixed communication apparatuses which is newly received with said first communication means;
• and
• hand-off process means for performing a hand-off to said second fixed communication apparatus from said plurality of first fixed communication apparatuses in accordance with the comparison result which is output from said first comparing means;
• wherein
• the hand-off is performed to said second fixed communication apparatus from said plurality of first fixed communication apparatuses.

A communication system for constructing a broad-band communication system with a plurality of first fixed communication apparatuses and a mobile communication apparatus and for constructing a closed-band communication system with said mobile communication apparatus and a second fixed communication apparatus, wherein said plurality of first fixed communication apparatuses comprises:

• hand-off information providing means for transmitting a selection signal of said second fixed communication apparatus for selecting said second fixed communication apparatus;
• and
• said mobile communication apparatus comprises:
• first communication means for communicating with said plurality of first fixed communication apparatuses;
• second communication means for communicating with said second fixed communication apparatus;
• a memory for memorizing in advance the selection signal of said second fixed communication apparatus for selecting said second fixed communication apparatus;
• comparing means for comparing the selection signal and providing a comparison result of said second fixed communication apparatus obtained by receiving a signal transmitted from said plurality of first fixed communication apparatuses at said first communication means with the selection signal of said second fixed communication apparatus, which signal is memorized in said memory;
• and
• hand-off process means for performing a hand-off to the second fixed communication apparatus from said plurality of first fixed communication apparatuses in accordance with the comparison result output from said comparing means, wherein
• a hand-off is performed to said second fixed communication apparatus from said plurality of first fixed communication apparatuses.

A communication method for constructing a broad-band communication system with a plurality of first fixed communication apparatuses and a mobile communication apparatus and for constructing a closed-band communication system with said mobile communication apparatus and a second fixed communication apparatus, wherein

• in said mobile communication apparatus, said method comprises the steps of:
• memorizing a selection signal of said plurality of first fixed communication apparatuses for selecting said plurality of first fixed communication apparatuses, said selection signal being obtained by receiving a signal transmitted from said plurality of first fixed communication apparatuses when a hand-off is performed between said plurality of first fixed communication apparatuses and second fixed communication apparatus;
• comparing the selection signal and providing a comparison result of said first fixed communication apparatus that has been memorized with the selection signal of said first fixed communication apparatus that is newly received;
• and
• performing a hand-off to said second fixed communication apparatus from said plurality of first fixed communication apparatuses in accordance with the comparison result thus obtained.

A communication method for constructing a broad-band communication system with a plurality of first fixed communication apparatuses and a mobile communication apparatus and for constructing a closed communication system with said mobile communication apparatus and a second fixed communication apparatus, wherein

• in said mobile communication apparatus, said method comprises the steps of:
• memorizing in advance a selection signal of the second fixed communication apparatus for selecting said second fixed communication apparatus;
• comparing said selection signal and providing a comparison result of said second fixed communication apparatus obtained by receiving a signal from said plurality of first fixed communication apparatuses, which is constructed for transmitting the selection signal of said second fixed communication apparatus, with said selection signal of said second fixed communication apparatus which has been memorized;
• and
• performing a hand-off from said plurality of first fixed communication apparatus to said second fixed communication apparatuses in accordance with the comparison result obtained.