Hand Over Method For Dual Band/Dual Mode Mobile Communication Terminal
First Claim
1. A handover method for a dual band/dual mode mobile communication terminal, the mobile communication terminal including an antenna for transmitting and receiving radio waves to/from an asynchronous mobile communication network and a synchronous mobile communication network, an asynchronous RF device for performing asynchronous communication with the asynchronous mobile communication network via the antenna, a synchronous RF device for performing synchronous communication with the synchronous mobile communication network via the antenna, a main processor for controlling wireless communication with the synchronous and asynchronous mobile communication networks via the synchronous and asynchronous Radio Frequency (RF) devices, and a common module for providing common resources, and being capable of performing wireless communication with the asynchronous mobile communication network and the synchronous mobile communication network, the method comprising:
- the first step of the main processor setting an initial mobile communication network connection to the asynchronous mobile communication network and connecting to the asynchronous mobile communication network when power is applied;
the second step of activating the synchronous RF device and setting up a connection to the synchronous mobile communication network when the intensity of a signal from the asynchronous mobile communication network is equal to or lower than a first predetermined reference value;
the third step of determining whether the intensity of a signal from the asynchronous mobile communication network is equal to or lower than a second predetermined reference value previously set for the handover;
the fourth step of activating the connection to the synchronous mobile communication network set up at the second step if the intensity of the signal from the asynchronous mobile communication network is determined to be equal to or lower than the second predetermined reference value at the third step; and
the fifth step of releasing the connection to the asynchronous mobile communication network.
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Abstract
The present invention relates to a handover method for a dual band/dual mode mobile communication terminal between a synchronous mobile communication network and an asynchronous mobile communication network. The method includes the first step of the main processor setting an initial mobile communication network connection to the asynchronous mobile communication network and connecting to the asynchronous mobile communication network when power is applied; the second step of activating the synchronous RF device and setting up a connection to the synchronous mobile communication network when the intensity of a signal from the asynchronous mobile communication network is equal to or lower than a first predetermined reference value; the third step of determining whether the intensity of a signal from the asynchronous mobile communication network is equal to or lower than a second predetermined reference value previously set for the handover; the fourth step of activating the connection to the synchronous mobile communication network set up at the second step if the intensity of the signal from the asynchronous mobile communication network is determined to be equal to or lower than the second predetermined reference value at the third step; and the fifth step of releasing the connection to the asynchronous mobile communication network.
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Citations
13 Claims
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1. A handover method for a dual band/dual mode mobile communication terminal, the mobile communication terminal including an antenna for transmitting and receiving radio waves to/from an asynchronous mobile communication network and a synchronous mobile communication network, an asynchronous RF device for performing asynchronous communication with the asynchronous mobile communication network via the antenna, a synchronous RF device for performing synchronous communication with the synchronous mobile communication network via the antenna, a main processor for controlling wireless communication with the synchronous and asynchronous mobile communication networks via the synchronous and asynchronous Radio Frequency (RF) devices, and a common module for providing common resources, and being capable of performing wireless communication with the asynchronous mobile communication network and the synchronous mobile communication network, the method comprising:
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the first step of the main processor setting an initial mobile communication network connection to the asynchronous mobile communication network and connecting to the asynchronous mobile communication network when power is applied; the second step of activating the synchronous RF device and setting up a connection to the synchronous mobile communication network when the intensity of a signal from the asynchronous mobile communication network is equal to or lower than a first predetermined reference value; the third step of determining whether the intensity of a signal from the asynchronous mobile communication network is equal to or lower than a second predetermined reference value previously set for the handover; the fourth step of activating the connection to the synchronous mobile communication network set up at the second step if the intensity of the signal from the asynchronous mobile communication network is determined to be equal to or lower than the second predetermined reference value at the third step; and the fifth step of releasing the connection to the asynchronous mobile communication network. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A handover method for a dual band/dual mode mobile communication terminal in a mobile communication network in which an asynchronous mobile communication network and a synchronous mobile communication network coexist, the mobile communication terminal having an asynchronous modem unit and a synchronous modem unit, the method comprising:
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the step of the asynchronous mobile communication network requesting connection switching to the synchronous mobile communication network as the mobile communication terminal, which connected to and performing call with the asynchronous mobile communication network, moves toward the synchronous mobile communication network and, accordingly, a handover event occurs; the step of a Mobile Switching Center (MSC) of the synchronous mobile communication network requesting handover by transmitting handover message to a BTS of the synchronous mobile communication network; the step of the BTS assigning a forward channel to the synchronous modem unit of the mobile communication terminal; the step of the MSC of the synchronous mobile communication network transmitting a response signal for the connection switching request to the asynchronous mobile communication network; the step of the asynchronous mobile communication network transmitting a handover instruction message, including channel assignment information, to the asynchronous modem unit of the mobile communication terminal; the step of the asynchronous modem unit of the mobile communication terminal transmitting the channel assignment information to the synchronous modem unit; the step of the synchronous modem unit performing a process of preparing for communication, thereby achieving mode switching between the asynchronous modem unit and the synchronous modem unit; the step of reverse channel assignment being achieved between the synchronous modem unit and the synchronous mobile communication network and the connection being completed; and the step of the synchronous mobile communication network requesting the asynchronous mobile communication network to release a call with the asynchronous modem unit. - View Dependent Claims (10, 11, 12, 13)
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Specification