Apparatus and method for decreasing handover delay in broadband wireless communication system
First Claim
Patent Images
1. A vertical handover method in a wireless communication system, the method comprising:
- determining whether an accessible target network exists while communicating with a serving network;
when the accessible target network exists, linking up to the target network during an initial network entry to the target network while being serviced by the serving network;
changing a communication state with the target network to an idle mode by de-registering the linked target network while being serviced by the serving network; and
performing a network re-entry to the target network in a vertical handover to the target network.
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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.
8 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 an accessible target network exists while communicating with a serving network; when the accessible target network exists, linking up to the target network during an initial network entry to the target network while being serviced by the serving network; changing a communication state with the target network to an idle mode by de-registering the linked target network while being serviced by the serving 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 an accessible broadband mobile communication network while communicating with the WLAN; when the accessible broadband mobile communication network exists, linking up to the broadband mobile communication network during an initial network entry to the broadband mobile communication network while being serviced by the WLAN; changing a communication state with the broadband communication network to an idle mode by de-registering the linked broadband mobile communication network while being serviced by the WLAN; 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 during an initial network entry to the target network while being serviced by a serving network, to change a communication state with the target network to an idle mode by de-registering the linked target network while being serviced by the serving network, 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 handover control module configured to; determine whether an accessible broadband mobile communication network exists while communicating with the WLAN; when the accessible broadband mobile communication network exists, link up to the broadband mobile communication network during an initial network entry to the broadband mobile communication network while being serviced by the WLAN; change a communication state with the broadband mobile communication network to an idle mode by de-registering the linked broadband mobile communication network while being serviced by the WLAN; and perform 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