Method and system for switching a radio access technology between wireless communication systems with a multi-mode wireless transmit/receive unit
First Claim
1. A method comprising:
- providing a service to a wireless transmit/receive unit (WTRU) via a cellular access network, wherein the WTRU is a multi-mode device capable of communicating with a plurality of radio access technologies (RATs);
receiving a first message from the WTRU, the first message requesting a Service Set Identifier (SSID) and indicating that the WTRU receiving the service is capable of communicating using wireless local area network (WLAN) technology;
sending, in response to receipt of the first message, a second message via the cellular access network, wherein the second message is responsive to the first message and includes the SSID indicative of a WLAN available to the WTRU for handoff;
sending, to the WTRU, a second IP address associated with the WLAN, wherein the second IP address is different than a first IP address associated with the cellular access network; and
in response to receiving an indication of handoff of the WTRU to the WLAN, providing the service to the WTRU via the WLAN.
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Abstract
A method and system for switching a radio access technology (RAT) between wireless communication systems connected to each other while implementing different RATs with a multi-mode WTRU are disclosed. A plurality of wireless communication systems are deployed with overlapping coverage areas wherein each system implements different RATs and are connected to each other such that a service that is provided by one system may be provided through the other system. Each wireless communication system transmits an indication of the existence of an inter-working wireless communication system in a coverage area of each system. The WTRU receives the indication and information regarding the inter-working wireless communication system. The WTRU then initiates a handoff to the inter-working wireless communication system using the received information, whereby the WTRU continues to receive the same services that the WTRU receives from the currently connected wireless communication system through the inter-working wireless communication system.
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Citations
18 Claims
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1. A method comprising:
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providing a service to a wireless transmit/receive unit (WTRU) via a cellular access network, wherein the WTRU is a multi-mode device capable of communicating with a plurality of radio access technologies (RATs); receiving a first message from the WTRU, the first message requesting a Service Set Identifier (SSID) and indicating that the WTRU receiving the service is capable of communicating using wireless local area network (WLAN) technology; sending, in response to receipt of the first message, a second message via the cellular access network, wherein the second message is responsive to the first message and includes the SSID indicative of a WLAN available to the WTRU for handoff; sending, to the WTRU, a second IP address associated with the WLAN, wherein the second IP address is different than a first IP address associated with the cellular access network; and in response to receiving an indication of handoff of the WTRU to the WLAN, providing the service to the WTRU via the WLAN. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A network device comprising:
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a processor; and a memory comprising instructions that when executed by the processor cause the network device to; provide a service to a wireless transmit/receive unit (WTRU) via a cellular access network, wherein the WTRU is a multi-mode device capable of communicating with a plurality of radio access technologies (RATs); receive a first message via the cellular access network, the first message requesting a Service Set Identifier (SSID) and indicating that the WTRU receiving the service is capable of communicating using wireless local area network (WLAN) technology; send, in response to receipt of the first message, a second message via the cellular access network, wherein the second message is responsive to the first message and includes the SSID indicative of a WLAN available to the WTRU for handoff; send, to the WTRU, a second IP address associated with the WLAN, wherein the second IP address is different than a first IP address associated with the cellular access network; and in response to receiving an indication of handoff of the WTRU to the WLAN, provide the service to the WTRU via the WLAN. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
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Specification