System and method for performing handoff between different types of networks by using a short message 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 message 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, wherein the activation message is a short message service (SMS) message;
transmitting the generated activation message to the user equipment;
searching, by the user equipment, for the accessible base station of the second network when the activation message 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 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 message 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 message 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 message 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.
36 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 message 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, wherein the activation message is a short message service (SMS) message; transmitting the generated activation message to the user equipment; searching, by the user equipment, for the accessible base station of the second network when the activation message 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 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 processor for searching for an accessible base station of the second network when an activation message with a first telephone number as a caller number is received by the user equipment, wherein the activation message is a short message service (SMS) message, wherein the activation message 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 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 message. - 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 message server configured to transmit an activation message with a first telephone number as a caller number, wherein the activate message is a short message service (SMS) message; a user equipment configured to search for an accessible base station of the second network when the activation message with the first telephone number is received; and an 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, wherein the message server transmits the activation message with the first telephone number as the caller number when the accessible base station is determined to be within a vicinity of the user equipment, wherein the 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 message server, wherein the message server generates and transmits the activation message when the trigger signal 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