MOBILE COMMUNICATION TERMINAL APPARATUS, CONTROL METHOD THEREOF, COMMUNICATION SYSTEM, AND ROAMING METHOD THEREOF
First Claim
1. A mobile communications terminal apparatus roaming among a plurality of packet switched data communications networks, the apparatus comprising:
- a network access unit (NAU) having a network access mechanism uniquely set by adjusting each specification of hardware, software, and protocol; and
a multiple access decision unit (MADU) that decides a channel to be used in communications session by exchanging information with said NAU by using one set of interfaces, and controls said NAU associated with the decided channel.
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Accused Products
Abstract
A mobile communication terminal apparatus and a control method thereof wherein a smooth handoff can be quickly achieved in a seamless manner during a roaming between data communication networks of different packet exchange systems. A mobile communication terminal apparatus (100) comprising a network access unit (NAU) (101) having a network access mechanism that has been uniquely established by adjusting the specifications of hardware, software and protocols; and a MADU (Multiple Access Decision Unit) (103) that uses a set of interfaces to exchange information with the NAU (101), thereby deciding a channel to be used in a communication session, and that controls the NAU (101) corresponding to the decided channel; wherein the mobile communication terminal apparatus performs a roaming between data communication networks of different packet exchange systems.
33 Citations
19 Claims
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1. A mobile communications terminal apparatus roaming among a plurality of packet switched data communications networks, the apparatus comprising:
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a network access unit (NAU) having a network access mechanism uniquely set by adjusting each specification of hardware, software, and protocol; and a multiple access decision unit (MADU) that decides a channel to be used in communications session by exchanging information with said NAU by using one set of interfaces, and controls said NAU associated with the decided channel. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 13, 14)
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10. A method for controlling a mobile communications terminal apparatus roaming among a plurality of packet switched data communications networks, where the mobile communications terminal apparatus comprises a network access unit (NAU) having a network access mechanism uniquely set by adjusting each specification of hardware, software, and protocol, and a multiple access decision unit (MADU) that decides a channel to be used in communications session by exchanging information with said NAU by using one set of interfaces, and controls said NAU associated with the decided channel, the method comprising the steps of:
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transmitting from said MADU to said NAU a query interface for getting information on said NAU; transmitting from said MADU to said NAU a configure interface for configuring the parameter associated with said NAU; and transmitting from said NAU to said MADU a trigger interface for notifying that the event has occurred or is about to occur. - View Dependent Claims (11, 12)
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15. A communications system having a constitution including a plurality of packet switched data communications networks and a mobile communications terminal apparatus roaming among the data communications networks, wherein the mobile communications terminal apparatus comprises:
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a network access unit (NAU) having a network access mechanism uniquely set by adjusting each specification of hardware, software, and protocol; and a multiple access decision unit (MADU) that decides a channel to be used in communications session by exchanging information with said NAU by using one set of interfaces, and controls said NAU associated with the decided channel. - View Dependent Claims (16, 17, 18)
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19. A roaming method of a mobile communications terminal apparatus between a plurality of a packet switched data communications networks, used in a communications system having a constitution including a mobile communications terminal apparatus that comprises a network access unit (NAU) having a network access mechanism uniquely set by adjusting each specification of hardware, software, and protocol, and a multiple access decision unit (MADU) that decides a channel to be used in communications session by exchanging information with said NAU by using one set of interfaces, and controls said NAU associated with the decided channel, and also including a plurality of packet switched data communications networks having base stations which establish channels with the mobile communications terminal apparatus, the roaming method comprising the steps of:
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transmitting at the mobile communication terminal apparatus a control message which contains a unique identifier for identification of the mobile communication terminal apparatus, a unique identifier for identification of the trigger message, and a time frame which is necessary for transmission of the trigger message before the estimated time of the occurrence of the event to the base station with which the current channel is held; requesting from the mobile communication terminal to the base station to transmit the trigger message upon the detection of the occurrence of the event; and transmitting from the base station to the mobile communications terminal apparatus a trigger message which contains a unique identifier for identification of the base station with which the mobile communications terminal apparatus holds the current channel now, a unique identifier for identification of another base station with which the mobile communications terminal apparatus is going to establish a new channel now, and an estimated time when the event will occur, upon reception of a trigger message transmission request from the mobile communications terminal apparatus, or upon detecting an occurrence of an event that the mobile communications terminal apparatus is moving out of operation area, where the detection is made by monitoring location of the mobile communications terminal apparatus.
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Specification