Method and system for facilitating handover from a third generation (3G) cellular communication system to a wireless local area network (WLAN)
First Claim
1. A method implemented in a wireless transmit/receive unit (WTRU), the method comprising:
- the WTRU receiving a network information message via a cellular network while the WTRU is in either active mode or idle mode,wherein the network information message includes information related to a plurality of wireless access networks available for handoff, the information including a neighbor cell list that identifies the plurality of wireless access networks available for handoff,wherein the plurality of wireless access networks includes a first wireless access network based on a first wireless access technology and a second wireless access network based on a second wireless access technology, wherein the first wireless access technology and the second wireless access technology are different, andwherein the plurality of wireless access networks consists of wireless access networks in the vicinity of the WTRU;
on a condition that the WTRU is in active mode, the WTRU performing physical measurements only on signals transmitted from the wireless access networks identified in the neighbor cell list, in response to receiving the neighbor cell list;
the WTRU selecting one of the networks from the plurality of wireless access networks for handover; and
the WTRU initiating a handover procedure with the selected network; and
on a condition that the WTRU is in idle mode, the WTRU selecting one of the wireless access networks identified in the neighbor cell list using the received information related to the wireless access network and initiating a new call to the selected wireless access network.
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Abstract
A method for facilitating inter-system handover by a multi-mode wireless transmit/receive unit (WTRU) is disclosed. The WTRU is capable of communicating in multiple wireless communication systems using different wireless communication protocols. A first wireless communication system provides a hot spot within the coverage area of a second wireless communication system. A base station in a cell in the second wireless communication system generates and transmits a message to inform the WTRU of the existence of the hot spot located in the vicinity of the cell. The WTRU receives the message and is therefore informed of the existence of the hot spot in the vicinity of the cell.
185 Citations
20 Claims
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1. A method implemented in a wireless transmit/receive unit (WTRU), the method comprising:
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the WTRU receiving a network information message via a cellular network while the WTRU is in either active mode or idle mode, wherein the network information message includes information related to a plurality of wireless access networks available for handoff, the information including a neighbor cell list that identifies the plurality of wireless access networks available for handoff, wherein the plurality of wireless access networks includes a first wireless access network based on a first wireless access technology and a second wireless access network based on a second wireless access technology, wherein the first wireless access technology and the second wireless access technology are different, and wherein the plurality of wireless access networks consists of wireless access networks in the vicinity of the WTRU; on a condition that the WTRU is in active mode, the WTRU performing physical measurements only on signals transmitted from the wireless access networks identified in the neighbor cell list, in response to receiving the neighbor cell list; the WTRU selecting one of the networks from the plurality of wireless access networks for handover; and the WTRU initiating a handover procedure with the selected network; and on a condition that the WTRU is in idle mode, the WTRU selecting one of the wireless access networks identified in the neighbor cell list using the received information related to the wireless access network and initiating a new call to the selected wireless access network. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A wireless transmit/receive unit (WTRU) comprising:
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a processor, for receiving a network information message via a cellular network while the WTRU is in either active mode or idle mode, wherein the network information message includes information related to a plurality of wireless access networks available for handoff, the information including a neighbor cell list that identifies the plurality of wireless access networks available for handoff, wherein the plurality of wireless access networks includes a first wireless access network based on a first wireless access technology and a second wireless access network based on a second wireless access technology, wherein the first wireless access technology and the second wireless access technology are different, and wherein the plurality of wireless access networks consists of wireless access networks in the vicinity of the WTRU; and a receiver, on a condition that the WTRU is in active mode, performs physical measurements only on signals transmitted from the wireless access networks identified in the neighbor cell list, in response to receiving the neighbor cell list; wherein the processor selects one of the networks from the plurality of wireless access networks for handover and to initiate a handover procedure with the selected network and wherein on a condition that the WTRU is in idle mode the processor selects one of the wireless access networks identified in the neighbor cell list using the received information related to the wireless access network and to initiate a new call to the selected wireless access network. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification