Method for performing roaming in dual mode mobile terminal capable of preventing ping-pong phenomenon
AssigneeSamsung Electronics Co., Ltd.
InventorJeong-Min Noh
Life of this patent
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Abstract
A method for performing roaming in a dual mode mobile terminal in such a manner that a ping-pong phenomenon, occurring under a weak electric field between communication networks providing communication services using different mobile communication techniques can be prevented. To this end, a communication path connected between modems performing a corresponding communication service is realized, so that roaming to a target mode can be achieved only in a case in which the intensity of a received signal measured through a target modem for the roaming has at least a predetermined threshold value. Where the intensity of the received signal has not at least the predetermined threshold value, a current mode is continuously maintained.
Claims8
A method for performing roaming in a dual mode mobile terminal such that a ping-pong phenomenon is prevented, the dual mode mobile terminal including a first modem and a second modem capable of providing a service through different mobile communication schemes, the method comprising:
- determining if a current position of the dual mode mobile terminal is within a service superposition area based on information received from a first communication network;
- turning on power of the second modem after a predetermined time interval through a communication path connected between the modems if the current position is within the service superposition area;
- determining if the current position is within a shadow area of a second communication network by measuring intensity of a signal received from the second modem during a preset time interval through the communication path;
- and
- maintaining a current mode if the current position is within the shadow area of the second communication network based on the determination result.
Dependencies are inferred from the claim text.