Method for acquiring handover network in multi-mode terminal and multi-mode terminal therefor
First Claim
1. A method for efficiently acquiring a handover network in a multi-mode terminal, which includes a first modem and a second modem supporting different communication services, the method comprising the steps of:
- determining whether a Universal Handover Direction Message (UHDM) is received from a first communication network by the first modem when it is necessary to acquire a handover network;
extracting information about a handover base station from the UHDM by the second modem when the UHDM has been received from the first modem; and
acquiring directly a second communication network using the extracted information by the second modem and then completing handover; and
acquiring the second communication network using a preferred roaming list when the UHDM is not received,wherein the information about the handover base station includes at least one of a handover channel and a base station identification code.
1 Assignment
0 Petitions
Accused Products
Abstract
Disclosed is a method capable of minimizing a period of time required for a handover network acquisition procedure when a handover occurs between communication networks which provide communication services using different mobile communication technologies. When a modem for a handover communication network performs network acquisition due to the occurrence of a handover, the modem previously extracts information about a handover channel from a Universal Handover Direction Message (UHDM), and uses the extracted channel information in a network acquisition procedure. Accordingly, the modem for a handover communication network can easily acquire a handover network even without using a preferred roaming list, and can omit an radio frequency (RF) tuning procedure by extracting a corresponding code division multiple access (CDMA) channel from the received UHDM, thereby reducing the total handover processing time period and increasing the success rate of the handover.
13 Citations
8 Claims
-
1. A method for efficiently acquiring a handover network in a multi-mode terminal, which includes a first modem and a second modem supporting different communication services, the method comprising the steps of:
-
determining whether a Universal Handover Direction Message (UHDM) is received from a first communication network by the first modem when it is necessary to acquire a handover network; extracting information about a handover base station from the UHDM by the second modem when the UHDM has been received from the first modem; and acquiring directly a second communication network using the extracted information by the second modem and then completing handover; and acquiring the second communication network using a preferred roaming list when the UHDM is not received, wherein the information about the handover base station includes at least one of a handover channel and a base station identification code. - View Dependent Claims (2, 3, 4)
-
-
5. A multi-mode terminal for efficiently acquiring a handover network, the multi-mode terminal comprising:
-
a first modem for extracting a Universal Handover Direction Message (UHDM) from a handover command message, when the first modem receives the handover command message from a first communication network while communicating through the first communication network; and a second modem for receiving the extracted UHDM from the first modem and acquiring directly a second communication network based on information about a handover base station, which is included in the received UHDM for completing handover, wherein the information about the handover base station includes at least one of a handover channel and a base station identification code; wherein the second modem acquires the second communication network by using a preferred roaming list if the UHDM is not received, when it is necessary to acquire a handover network. - View Dependent Claims (6, 7, 8)
-
Specification