US 2009/0023449 A1 · METHOD AND SYSTEM FOR PERFORMING HANDOVER OF MULTIMODE-MULTIBAND TERMINAL BY USING MULTI TARGET CELL IN MOBILE COMMUNICATION ENVIRONMENT

Abstract

Disclosed are a method and a system for performing handover of a multimode-multiband terminal by using multi-target cells in a mobile communication environment. The method for performing handover of a multimode-multiband terminal using multi-target cells in a mobile communication environment, which increases a probability of handover and improves communication quality by using the multi-target cells in a mobile communication system including a CDMA-2000 system, which includes a base station transmitter and a base station controller and provides a CDMA-2000 service to a terminal requesting connection, and a WCDMA system, which includes a radio transceiver subsystem (RTS) and a radio network controller (RNC) and provides a WCDMA service to the terminal requesting the terminal, comprises the steps of: (a) receiving a WCDMA signal transmitted from the WCDMA system through a WCDMA modem and measuring an energy of carrier/interference of others (Ec/Io) value; (b) turning on a CDMA-2000 modem according to the measured value and entering into an idle state; (c) creating multi-target cell information by monitoring a target cell for handover; (d) requesting handover to the WCDMA system; (e) receiving a handover command from the WCDMA system; and (f) turning off the WCDMA modem and switches a communication link to the CDMA-2000 system through the CDMA-2000 modem.

Claims24

Dependent claims

A method for performing handover of a multimode-multiband terminal using multi-target cells in a mobile communication environment, which increases a probability of handover and improves communication quality by using the multi-target cells in a mobile communication system including a CDMA-2000 system and a WCDMA system, the CDMA-2000 system including a base station transmitter and a base station controller and providing a CDMA-2000 service to a terminal requesting connection, the WCDMA system including a radio transceiver subsystem (RTS) and a radio network controller (RNC) and providing a WCDMA service to the terminal requesting the terminal, the method comprising the steps of:

(a) receiving a WCDMA signal transmitted from the WCDMA system through a WCDMA modem and measuring an energy of carrier/interference of others (Ec/Io) value;
(b) turning on a CDMA-2000 modem according to the measured value and entering into an idle state;
(c) creating multi-target cell information by monitoring a target cell for handover;
(d) requesting handover to the WCDMA system;
(e) receiving a handover command from the WCDMA system;
and
(f) turning off the WCDMA modem and switches a communication link to the CDMA-2000 system through the CDMA-2000 modem.

4 more elements

A multimode-multiband terminal which increases a probability of handover and improves communication quality by using multi-target cells in a mobile communication system including a CDMA-2000 system and a WCDMA system, the CDMA-2000 system including a base station transmitter and a base station controller and providing a CDMA-2000 service to a terminal requesting connection, the WCDMA system including a radio transceiver subsystem (RTS) and a radio network controller (RNC) and providing a WCDMA service to the terminal requesting the terminal, the multimode-multiband terminal comprising:

an antenna for transmitting and receiving an RF signal through an air interface;
an RF transceiver for transmitting, receiving, and modulating the RF signal;
a CDMA-2000 filter for extracting only a desired CDMA signal from RF signals having a CDMA-2000 band from the RF transceiver;
a CDMA-2000 modem for performing call processing for the CDMA signal according to a protocol defined in a CDMA-2000 specification;
a WCDMA filter for extracting only a desired WCDMA signal from RF signals having a WCDMA band from the RF transceiver;
a WCDMA modem for performing call processing for the WCDMA signal according to a protocol defined in a WCDMA specification;
a controller for performing a control operation so that one of a WCDMA mode and a CDMA-2000 mode is selected;
and
a program storage module including a real time operating system and a multi-target cell monitoring program.

6 more elements

A mobile communication system for providing a CDMA-2000 service and a WCDMA service to a multimode-multiband terminal, thereby reducing time of searching for a target cell and improving a probability of handover and communication quality by using multi-target cells, the mobile communication system comprising:

a CDMA-2000 radio access network for providing the CDMA-2000 service through a traffic channel among signal channels and being arranged based on a cell unit;
a WCDMA radio access network for providing the WCDMA service through a traffic channel among signal channels and being arranged based on a cell unit;
and
a mobile switching center for processing basic and additional services, incoming and outgoing calls of a subscriber, a location information registration procedure, a handover procedure, and an interconnection function with another network and being connected with the CDMA-2000 radio access network and the WCDMA radio access network.

1 more element

Dependencies are inferred from the claim text.

Method and system for performing handover of multimode-multiband terminal by using multi target cell in mobile communication environment

Life of this patent

Method and system for performing handover of multimode-multiband terminal by using multi target cell in mobile communication environment

Life of this patent

Abstract

Claims24