Method of seamless roaming between wireless local area networks and cellular carrier networks
First Claim
Patent Images
1. A method comprising:
- facilitating, by proxying at a computing device, a communication session between a first device connected to the computing device through a wireless local link of a wireless local area network and a second device connected to a cellular wide area network, wherein the computing device is local to the first device during at least a portion of the communication session, and wherein the computing device directly connects to the wireless local area network and directly connects to the cellular wide area network via a cellular base station through a cellular radio as a cellular radio endpoint; and
communicating, during the communication session, voice data transmitted via session initiation protocol (SIP), wherein the voice data comprises voice over IP (VoIP) packets, wherein the communication session includes a first communication path and a second communication path, wherein the first communication path connects the second device through the cellular wide area network to the computing device and then to the first device via the wireless local link between the first device and the computing device, and wherein the second communication path connects the second device though the cellular wide area network to the first device and does not include the wireless local area network, andswitching from the first communication path to the second communication path, controlled by the computing device, when a signal quality of the wireless local link approaches a pre-determined threshold.
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Abstract
A scheme that enables seamless roaming between the WLAN and the cellular carrier network by enabling a user that originates a call in the WLAN and happens to go outside the range of the WLAN to automatically switch over to the cellular carrier network without losing connection with the other party. This solution assumes that the mobile device has the capability to operate in at least two modes that include the WLAN mode and one of the cellular carrier modes, such as the GSM, IS-95 CDMA, IS-136 TDMA, and iDEN.
31 Citations
20 Claims
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1. A method comprising:
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facilitating, by proxying at a computing device, a communication session between a first device connected to the computing device through a wireless local link of a wireless local area network and a second device connected to a cellular wide area network, wherein the computing device is local to the first device during at least a portion of the communication session, and wherein the computing device directly connects to the wireless local area network and directly connects to the cellular wide area network via a cellular base station through a cellular radio as a cellular radio endpoint; and communicating, during the communication session, voice data transmitted via session initiation protocol (SIP), wherein the voice data comprises voice over IP (VoIP) packets, wherein the communication session includes a first communication path and a second communication path, wherein the first communication path connects the second device through the cellular wide area network to the computing device and then to the first device via the wireless local link between the first device and the computing device, and wherein the second communication path connects the second device though the cellular wide area network to the first device and does not include the wireless local area network, and switching from the first communication path to the second communication path, controlled by the computing device, when a signal quality of the wireless local link approaches a pre-determined threshold. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A device comprising:
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a first radio terminal configured to directly connect to a wireless local area network; a second radio terminal configured to directly connect to a cellular wide area network via a connection to a cellular base station as a cellular radio endpoint; and a computing device connected to the first radio terminal and to the second radio terminal and configured to; facilitate, by proxying, a communication session between a first device and a second device, wherein the computing device is local to the first device during at least a portion of the communication session, and wherein the computing device is connected to the first device through a wireless local link of the wireless local area network and connected to the second device via the cellular wide area network; and communicate, during the communication session, voice data transmitted via session initiation protocol (SIP), wherein the voice data comprises voice over IP (VoIP) packets, wherein the communication session includes a first communication path and a second communication path, wherein the first communication path connects the second device through the cellular wide area network to the computing device and then to the first device via the wireless local link and wherein the second communication path connects the second device though the cellular wide area network to the first device and does not include the wireless local area network, and switch from the first communication path to the second communication path, under control of the computing device, when a signal quality of the wireless local link approaches a pre-determined threshold. - View Dependent Claims (10, 11, 12, 13, 14, 15)
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16. A system comprising:
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a first device directly connected to a wireless local area network; a second device coupled to a cellular wide area network; and a computing device configured to; facilitate, by proxying, a communication session between the first device and the second device, wherein the computing device is local to the first device during at least a portion of the communication session, wherein the computing device directly connects to the wireless local area network and directly connects to the cellular wide area network via a cellular base station through a cellular radio as a cellular radio endpoint, communicate, during the communication session, voice data transmitted via session initiation protocol (SIP), wherein the voice data comprises voice over IP (VoIP) packets, wherein the communication session includes a first communication path and a second communication path, wherein the first communication path connects the second device through the cellular wide area network to the computing device and then to the first device via a wireless local link of the wireless local area network to the first device and does not include the wireless local area network, and wherein the second communication path connects the second device though the cellular wide area network to the first device and does not include the wireless local area network, and switch from the first communication path to the second communication path, under control of the computing device, when a signal quality of the wireless local link approaches a pre-determined threshold. - View Dependent Claims (17, 18, 19, 20)
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Specification