Apparatus and method for decreasing handover delay in broadband wireless communication system
First Claim
1. A vertical handover method in a wireless communication system, the method comprising:
- determining whether there exists an accessible target network while communicating with a serving network;
when there exists the accessible target network, linking up to the target network;
changing a communication state to an idle mode by de-registering the linked target network; and
performing a network re-entry to the target network in a vertical handover to the target network.
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Accused Products
Abstract
Vertical handover apparatus and method in a wireless communication system are provided. The method includes examining whether there exists an accessible target network while communicating with a serving network; when there exists the accessible target network, linking up to the target network; changing a communication state to an idle mode by de-registering the linked target network; and performing a network re-entry to the target network in a vertical handover to the target network. When the terminal can execute the vertical handover without the seamless service support and reduce the handover delay.
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Citations
20 Claims
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1. A vertical handover method in a wireless communication system, the method comprising:
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determining whether there exists an accessible target network while communicating with a serving network; when there exists the accessible target network, linking up to the target network; changing a communication state to an idle mode by de-registering the linked target network; and performing a network re-entry to the target network in a vertical handover to the target network. - View Dependent Claims (2, 3, 4, 5)
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6. A vertical handover method between a Wireless Local Area Network (WLAN) and an orthogonal Frequency Division Multiple Access (OFDMA) broadband mobile communication network in a wireless communication system, the method comprising:
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determining whether there exists an accessible broadband mobile communication network while communicating with the WLAN; when there exists the accessible broadband mobile communication network, linking up to the broadband mobile communication network; changing a communication state to an idle mode by de-registering the linked broadband mobile communication network; and performing a network re-entry to the broadband mobile communication network in the handover to the broadband mobile communication network. - View Dependent Claims (7, 8, 9, 10, 11, 12)
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13. A terminal of a wireless communication system which supports multiple networks, the terminal comprising:
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at least two Media Access Control (MAC) layer parts for communicating with at least two different networks; and a handover control module for controlling the MAC layer parts to link up to an accessible target network, to change a communication state to an idle mode, and to perform a network re-entry procedure to the target network in a vertical handover. - View Dependent Claims (14, 15, 16)
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17. A vertical handover apparatus between a Wireless Local Area Network (WLAN) and an orthogonal Frequency Division Multiple Access (OFDMA) broadband mobile communication network in a wireless communication system, the apparatus comprising:
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a means for determining whether there exists an accessible broadband mobile communication network while communicating with the WLAN; when there exists the accessible broadband mobile communication network, linking up to the broadband mobile communication network; changing a communication state to an idle mode by de-registering the linked broadband mobile communication network; and performing a network re-entry procedure to the broadband mobile communication network to hand over to the broadband mobile communication network. - View Dependent Claims (18, 19, 20)
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Specification