System and method for performing handoff between different types of networks by using a voice service
First Claim
1. A method for handing off a communication session of a user equipment from a first network to a second network, the method comprising;
- determining, by a network information server in the first network, whether an accessible base station of the second network is located in a vicinity of the user equipment based on information on a current location of the user equipment within the first network;
generating, by the network information server in the first network, a trigger signal when the network information server determines the accessible base station of the second network is located in the vicinity of the user equipment;
transmitting, by the network information server in the first network, the trigger signal to a call transmitting server;
generating, by the call transmitting server, when the trigger signal is received, an activation call with a first telephone number as a caller number when the accessible base station of the second network is determined to be located in the vicinity of the user equipment;
transmitting the generated activation call to the user equipment;
initiating searching, by the user equipment in response to the generated activation call, for the accessible base station of the second network when the activation call with the first telephone number is received by the user equipment; and
executing the handoff from the first network to the second network when the user equipment finds the accessible base station of the second network as a result of the searching and enters a service area of the accessible base station.
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Accused Products
Abstract
A system and method for handing off from a first network to a second network. A determination may be made as to whether an accessible base station of the second network is located in the vicinity of a user equipment based on information on a current location of the user equipment in the first network. An activation call may be generated with a first telephone number as a caller number when an accessible base station of the second network is located in the vicinity of the user equipment based on the determination result. The activation call indicates an initiation of a search for an accessible base station of the second network, and an accessible base station of the second network may be searched for when the activation call with the first telephone number is received. A handoff from the first network to the second network may then be executed when the accessible base station of the second network is located.
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Citations
20 Claims
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1. A method for handing off a communication session of a user equipment from a first network to a second network, the method comprising;
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determining, by a network information server in the first network, whether an accessible base station of the second network is located in a vicinity of the user equipment based on information on a current location of the user equipment within the first network; generating, by the network information server in the first network, a trigger signal when the network information server determines the accessible base station of the second network is located in the vicinity of the user equipment; transmitting, by the network information server in the first network, the trigger signal to a call transmitting server; generating, by the call transmitting server, when the trigger signal is received, an activation call with a first telephone number as a caller number when the accessible base station of the second network is determined to be located in the vicinity of the user equipment; transmitting the generated activation call to the user equipment; initiating searching, by the user equipment in response to the generated activation call, for the accessible base station of the second network when the activation call with the first telephone number is received by the user equipment; and executing the handoff from the first network to the second network when the user equipment finds the accessible base station of the second network as a result of the searching and enters a service area of the accessible base station. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A method for handing off a communication session of a user equipment from a first network to a second network, the method comprising:
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registering information on a current location of the user equipment located within the first network; initiating a means for searching for an accessible base station of the second network when an activation call with a first telephone number as a caller number is received by the user equipment, wherein the activation call is generated by a call transmitting server when a network information server in the first network determines that an accessible base station of the second network is located within a vicinity of the user equipment; and executing the handoff from the first network to the second network when the user equipment finds the accessible base station of the second network and enters a service area of the accessible base station, wherein the step of the initiating a means includes the steps of; generating, by the network information server in the first network, a trigger signal when the network information server determines the accessible base station of the second network is located in the vicinity of the user equipment; transmitting, by the network information server in the first network, the trigger signal to the call transmitting server; and generating and transmitting, by the call transmitting server, when the trigger signal is received, the activation call. - View Dependent Claims (16, 17, 18, 19)
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20. A system for handing off a communication session from a first network to a second network, the system comprising;
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a user equipment; a network information server in the first network configured to determine whether an accessible base station of the second network is located within a vicinity of the user equipment; and a call transmitting server configured to generate an activation call with a first telephone number as a caller number when the accessible base station of the second network is determined to be within the vicinity of the user equipment, and transmit the activation call to the user equipment, wherein the network information server in the first network is configured to generate a trigger signal when the accessible base station of the second network is determined to be within the vicinity of the user equipment, and transmit the trigger signal to the call transmitting server, wherein the call transmitting server generates and transmits the activation call when the trigger signal is received, wherein the user equipment configured to search for the accessible base station of the second network using a searching means initiated when the activation call with the first telephone number is received, and wherein the user equipment executes the handoff from the first network to the second network when the user equipment finds the accessible base station of the second network and enters a service area of the accessible base station.
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Specification