KR20030037884A - Method for acquiring mobile communication systems in a cdma2000 1x mobile communication terminal equipment - Google Patents

Method for acquiring mobile communication systems in a cdma2000 1x mobile communication terminal equipment Download PDF

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KR20030037884A
KR20030037884A KR1020010068977A KR20010068977A KR20030037884A KR 20030037884 A KR20030037884 A KR 20030037884A KR 1020010068977 A KR1020010068977 A KR 1020010068977A KR 20010068977 A KR20010068977 A KR 20010068977A KR 20030037884 A KR20030037884 A KR 20030037884A
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South Korea
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mobile communication
communication terminal
cdma2000
network
controller
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KR1020010068977A
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Korean (ko)
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감두열
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삼성전자주식회사
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Publication of KR20030037884A publication Critical patent/KR20030037884A/en

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/14—Reselecting a network or an air interface
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/24—Reselection being triggered by specific parameters
    • H04W36/30—Reselection being triggered by specific parameters by measured or perceived connection quality data
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W48/00—Access restriction; Network selection; Access point selection
    • H04W48/18—Selecting a network or a communication service

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Computer Security & Cryptography (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

PURPOSE: A mobile communication system obtaining method of a CDMA2000 1x mobile communication terminal is provided to allow a mobile communication terminal to obtain a 2G(Second Generation) of wireless communication system when a radio environment of 1x channel is not good and thus a normal service is not possible. CONSTITUTION: When a power is ON(302), a controller of a CDMA2000 1x mobile communication terminal determines a mobile communication system for receiving a service(304). The controller judges channels have been obtained from both 1x network and a 2G network(306). After the controller obtains channels from both the 1x system and the 2G system, it selects the 1x system preferentially(308). The controller checks whether an RSSI(Received Signal Strength indication) and Ec/Id(Energy Carrier-to-Interference Density) value is maintained below a pre-set threshold value(310,312). If the RSSI and Ec/Id values are maintained below the threshold value for a predetermined time, the controller suspends providing the service through the unstable 1x network and selects the 2G system with an excellent radio environment(314). The CDMA2000 1x mobile communication terminal selects a mobile communication terminal for receiving the service, and it turns to an idle state(316).

Description

ＣＤＭＡ2000 1ｘ 이동통신단말기의 이동통신시스템 획득 방법{METHOD FOR ACQUIRING MOBILE COMMUNICATION SYSTEMS IN A CDMA2000 1X MOBILE COMMUNICATION TERMINAL EQUIPMENT}METHOD FOR ACQUIRING MOBILE COMMUNICATION SYSTEMS IN A CDMA2000 1X MOBILE COMMUNICATION TERMINAL EQUIPMENT}

본 발명은 CDMA 2000 cdma2000 1x 이동통신단말기에 관한 것으로, 특히 2, 3세대의 통신망을 사용할 수 있는 cdma2000 1x 이동통신단말기의 이동통신시스템 획득 방법에 관한 것이다.The present invention relates to a CDMA 2000 cdma2000 1x mobile communication terminal, and more particularly, to a method for obtaining a mobile communication system of a cdma2000 1x mobile communication terminal capable of using a second and third generation communication networks.

이동통신시스템은 IS-95A(Interim Standard-95A)와 IS-95B의 2G(Second generation of wireless communication system)에서 주파수 대역폭과 데이터 전송속도를 향상시킨 IS-95C(cdma2000 1x)로 발전하였다.The mobile communication system has evolved into the IS-95C (cdma2000 1x), which improves the frequency bandwidth and data transmission speed in the IS-95A (Interim Standard-95A) and the IS-95B's Second Generation of Wireless Communication System (2G).

현재 전국적으로 2G망 즉 IS-95A, IS-95B망은 이미 깔려 있는 상태이며, 1x망 즉, IS-95C망이 IS-95A, IS-95B 망에 중첩되어 깔려 있다. cdma2000-1x는 아직 전국망이 아니기 때문에 전국망이 개통되기 전까지는 기존 IS-95A/B 망과 연동되어 무선데이터 서비스 사용을 지원하게 된다. 이에 따라 cdma2000 1x 이동통신단말기 즉, IS-95C를 지원하는 단말기는 2G와 1x 서비스를 동시에 액세스할 수 있도록 구성되어 2G(95A/95B) 지역으로 들어왔을 때 IS-95A/B 수준의 서비스를 제공받는다.Currently, 2G networks, IS-95A and IS-95B networks are already laid out nationwide, and 1x networks, that is, IS-95C networks, are overlapped with IS-95A and IS-95B networks. Since cdma2000-1x is not yet a national network, it supports the use of wireless data service by interworking with the existing IS-95A / B network until the national network is opened. Accordingly, the cdma2000 1x mobile communication terminal, that is, the terminal supporting IS-95C, is configured to simultaneously access 2G and 1x services and provides IS-95A / B level service when entering the 2G (95A / 95B) area. Receive.

그런데, cdma2000 1x 이동통신단말기는 1x 망이 깔려 있지 않으면 종전의 2G 단말기처럼 2G 시스템을 획득하지만, 1x를 지원하는 시스템이 있는 경우에는 무조건 1x 시스템을 획득한다.However, the cdma2000 1x mobile communication terminal acquires a 2G system like a conventional 2G terminal when the 1x network is not installed, but acquires a 1x system unconditionally when there is a system supporting 1x.

도 1은 cdma2000 1x 이동통신단말기가 서비스 받을 이동통신시스템을 획득하는 과정을 나타내는 흐름도이다. 도 1을 참조하면, cdma2000 1x 이동통신단말기는 단계 102에서 파워 온되면, 단계 104로 진행하여 서비스 받을 이동통신시스템을 결정하는 것을 개시한다. 그에 따라 cdma2000 1x 이동통신단말기는 단계 106에서 1x망과 2G망 모두로부터 채널을 획득하면 단계 108으로 진행하여 1x 시스템을 선택한다. 만약 cdma2000 1x 이동통신단말기가 2G망으로부터만 채널을 획득하면 단계 110로 진행하여 2G 시스템을 선택한다. cdma2000 1x 이동통신단말기는 서비스 받을 이동통신단말기를 선택한 후 단계 112에서 아이들 상태(idle state)가 된다.1 is a flowchart illustrating a process of acquiring a mobile communication system to be serviced by a cdma2000 1x mobile communication terminal. Referring to FIG. 1, when the cdma2000 1x mobile communication terminal is powered on at step 102, the cdma2000 1x mobile communication terminal proceeds to step 104 to determine a mobile communication system to be serviced. Accordingly, when the cdma2000 1x mobile communication terminal acquires a channel from both the 1x network and the 2G network in step 106, the cdma2000 1x mobile communication terminal selects the 1x system. If the cdma2000 1x mobile communication terminal acquires a channel only from the 2G network, it proceeds to step 110 to select a 2G system. The cdma2000 1x mobile communication terminal selects a mobile communication terminal to be serviced and becomes an idle state in step 112.

도 2는 cdma2000 1x 이동통신단말기가 1x망과 2G 망이 중첩된 영역에 있는 경우를 모식적으로 나타낸 도면이다. 도 2를 참조하면, cdma2000 1x 이동통신단말기(20)는 1x 망과 2G 망이 중첩된 영역에 있는 경우 우선적으로 1x 시스템을 획득한다. cdma2000 1x 이동통신단말기(20)는 중첩된 망을 벗어나거나 1x 채널을 놓칠 때까지 계속적으로 1x 망을 유지한다. 1x, 2G 중첩된 망에서 1x 채널을 놓쳐서 2G 채널을 획득할 경우에도 단말기는 주기적으로 1x망을 검색하여 1x 망을 획득하기 위한 시도를 계속한다.FIG. 2 is a diagram schematically illustrating a case where a cdma2000 1x mobile communication terminal is in a region where an 1x network and a 2G network overlap. Referring to FIG. 2, the cdma2000 1x mobile communication terminal 20 first obtains a 1x system when the 1x network and the 2G network are in an overlapped area. The cdma2000 1x mobile communication terminal 20 continuously maintains the 1x network until it exits the overlapped network or misses the 1x channel. Even if the 2x channel is acquired by missing the 1x channel in the 1x and 2G overlapped networks, the terminal periodically searches for the 1x network and continues attempting to acquire the 1x network.

그러나, 현재 상용화된 cdma2000 1x 이동통신단말기의 경우 1x와 2G 시스템이 중첩된 지역에서 무조건적으로 1x 망을 획득하도록 되어 있기 때문에 1x 채널의 전계가 불량하거나 1x와 2G의 핸드오버 지역일 경우, 단말기는 우선적으로 1x 시스템을 획득하므로 전계의 상태가 훨씬 양호한 2G 채널이 있음에도 불구하고 전계가 열악한 1x 채널을 획득함으로써 통화품질의 저하 및 정상적인 서비스를 받는 것이 곤란할 수 있다.However, in the case of commercially available cdma2000 1x mobile communication terminals, 1x and 2G systems are acquired unconditionally to obtain 1x network in the overlapped area, so if the electric field of 1x channel is poor or the handover area of 1x and 2G, By acquiring the 1x system first, it may be difficult to reduce the call quality and receive normal service by acquiring the poor 1x channel even though there is a 2G channel having a much better electric field.

따라서, 본 발명의 목적은 cdma2000 1x 이동통신단말기가 1x 채널의 전파 환경이 좋지 않아 정상적인 서비스가 불가능 할 경우 2G 시스템을 획득하기 위한 cdma2000 1x 이동통신단말기의 이동통신시스템 획득 방법을 제공함에 있다.Accordingly, an object of the present invention is to provide a method for acquiring a mobile communication system of a cdma2000 1x mobile communication terminal for acquiring a 2G system when the cdma2000 1x mobile communication terminal does not have good 1x channel propagation environment and thus normal service is not possible.

이러한 목적을 달성하기 위하여, 본 발명은 cdma2000 1x 이동통신단말기의이동통신시스템 획득 방법에 있어서, 1x망과 2G망이 중첩된 영역에서 1x 시스템을 우선적으로 획득하는 단계와, 상기 1x 시스템으로부터 수신되는 전파의 세기를 측정하여 임계값 이하로 소정 시간 이상 계속되는 지를 검사하는 단계와, 상기 측정한 전파의 세기가 임계값 이하로 소정 시간 이상 계속되면 상기 2G 시스템을 획득하여 서비스를 받는 단계를 포함한다.In order to achieve the above object, the present invention provides a method for acquiring a mobile communication system of a cdma2000 1x mobile communication terminal, the method comprising first obtaining a 1x system in a region where an 1x network and a 2G network overlap, and received from the 1x system. Measuring the intensity of the radio wave and checking whether the measured radio wave continues below a threshold for a predetermined time, and obtaining the 2G system and receiving a service when the measured intensity of the radio wave continues below a threshold for a predetermined time.

도 1은 종래의 cdma2000 1x 이동통신단말기가 서비스 받을 이동통신시스템을 획득하는 과정을 나타내는 흐름도,1 is a flowchart illustrating a process of acquiring a mobile communication system to be serviced by a conventional cdma2000 1x mobile communication terminal;

도 2는 cdma2000 1x 이동통신단말기가 1x망과 2G 망이 중첩된 영역에 있는 경우를 모식적으로 나타낸 도면,FIG. 2 is a diagram schematically illustrating a case where a cdma2000 1x mobile communication terminal is in a region where an 1x network and a 2G network overlap.

도 3은 본 발명이 적용되는 이동통신단말기의 블록 구성도,3 is a block diagram of a mobile communication terminal to which the present invention is applied;

도 4는 본 발명의 바람직한 실시예에 따라 1x 이동통신단말기에서의 이동통신시스템 획득 방법을 나타낸 제어 흐름도.4 is a control flowchart illustrating a method for obtaining a mobile communication system in a 1x mobile communication terminal according to a preferred embodiment of the present invention.

이하 본 발명의 바람직한 실시 예들을 첨부한 도면을 참조하여 상세히 설명한다. 또한 본 발명의 요지를 불필요하게 흐릴 수 있는 공지 기능 및 구성에 대한 상세한 설명은 생략한다.Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. In addition, detailed descriptions of well-known functions and configurations that may unnecessarily obscure the subject matter of the present invention will be omitted.

본 발명에 따른 cdma2000 1x 이동통신단말기는 1x 망과 2G 망이 중첩된 영역에 있는 경우 1x 시스템을 우선적으로 획득하고, 이후 기지국으로부터 수신되는 신호를 이용하여 1x 채널을 계속적으로 유지할 지를 결정한다. 그에 따라 cdma2000 1x 이동통신단말기는 양호한 1x 서비스를 받기 어렵다고 판단되면 2G 채널로 이동하여 원활한 채널 환경에서 서비스를 받을 수 있도록 한다.The cdma2000 1x mobile communication terminal according to the present invention preferentially acquires the 1x system when the 1x network and the 2G network are overlapped, and then determines whether to continuously maintain the 1x channel using a signal received from the base station. Accordingly, if the cdma2000 1x mobile communication terminal determines that it is difficult to receive a good 1x service, the cdma2000 1x mobile terminal moves to the 2G channel to receive the service in a smooth channel environment.

도 3은 본 발명이 적용되는 이동통신단말기의 블록 구성도를 나타낸다.3 is a block diagram of a mobile communication terminal to which the present invention is applied.

도 1를 참조하면, 제어부(210)는 1x 이동통신단말기의 전반적인 제어 동작을 수행한다. 또한 제어부(10)는 본 발명에 따라 1x망과 2G망이 중첩된 영역에 있는 경우에 본 발명에 따른 제어 흐름을 수행한다. 구체적으로, 제어부(210)는 1x망과 2G망이 중첩된 영역에서 우선적으로 1x 시스템을 획득하게 된다. 이어서제어부(210)는 1x 채널을 획득 후 대기 상태에서 지속적으로 RSSI 및 Ec/Io 값을 내부적으로 설정한 임계값 이하로 일정 시간 이상 계속되면 불안정한 1x 채널로부터 서비스 받는 것을 중지하고 2G 시스템을 선택한다.Referring to FIG. 1, the controller 210 performs an overall control operation of a 1x mobile communication terminal. In addition, the controller 10 performs the control flow according to the present invention when the 1x network and the 2G network are in an overlapping area according to the present invention. In detail, the controller 210 preferentially acquires the 1x system in an area where the 1x network and the 2G network overlap. Subsequently, the controller 210 stops receiving the service from the unstable 1x channel and selects the 2G system when the 1x channel is acquired and continues for more than a predetermined time in the standby state continuously below the threshold that internally sets the RSSI and Ec / Io values. .

무선부(216)는 제어부(10)의 제어 하에 음성 및 문자 데이터와 제어 데이터의 송수신을 제어하고, 음성처리부(218)는 제어부(10)의 제어 하에, 무선부(216)로부터 수신된 음성 데이터를 스피커(speaker) SPK를 통해 가청음으로 변환하여 출력하며 마이크로폰(microphone) MIC로부터 수신되는 음성신호를 데이터화하여 무선부(16)로 출력한다. 키입력부(212)는 다수의 숫자키 및 기능키들을 구비하고 있으며, 사용자가 누르는 키에 대응하는 키입력 데이터를 제어부(210)로 출력한다. 표시부(214)는 제어부(210)의 제어 하에 각종 메시지 등을 LCD(Liquid Crystal Display,미도시함)상에 디스플레이한다. 메모리부(20)는 이동통신단말기의 동작 제어 시 필요한 프로그램 데이터를 저장하고 있는 프로그램 메모리와, 제어 시 또는 사용자에 의해 수행도중 발생되는 데이터를 저장하는 데이터 메모리 등을 포함하고 있다.The wireless unit 216 controls transmission and reception of voice and text data and control data under the control of the controller 10, and the voice processing unit 218 controls the voice data received from the wireless unit 216 under the control of the controller 10. The speaker converts the audible sound through a speaker SPK and outputs the voice signal received from the microphone MIC to the wireless unit 16. The key input unit 212 includes a plurality of numeric keys and function keys, and outputs key input data corresponding to a key pressed by the user to the controller 210. The display unit 214 displays various messages and the like on a liquid crystal display (LCD) under the control of the controller 210. The memory unit 20 includes a program memory for storing program data necessary for controlling the operation of the mobile communication terminal, and a data memory for storing data generated during control or during execution by the user.

도 4는 본 발명의 바람직한 실시예에 따라 1x 이동통신단말기에서의 이동통신시스템 획득 방법을 나타낸 제어 흐름도이다.4 is a control flowchart illustrating a method for obtaining a mobile communication system in a 1x mobile communication terminal according to a preferred embodiment of the present invention.

우선 cdma2000 1x 이동통신단말기의 제어부(210)는 단계 302에서 파워 온되면, 단계 304로 진행하여 서비스 받을 이동통신시스템을 결정하는 것을 개시한다. 이에 따라 제어부(210)는 단계 306에서 1x망과 2G망 모두로부터 채널을 획득하였는지를 판단한다. 제어부(210)는 1x 시스템과 2G 시스템 모두로부터 채널을 획득하였으면 단계 308에서 우선적으로 1x 시스템을 선택하게 된다. 또한, 제어부(210)는 전술한 바와 같이 1x망과 2G망이 중첩된 영역에서 1x 채널을 놓쳐서 2G 채널을 획득한 경우에도 주기적으로 1x망을 검색하여 1x 시스템을 획득하기 위한 시도를 계속하게 된다.First, when the control unit 210 of the cdma2000 1x mobile communication terminal is powered on in step 302, the controller 210 proceeds to step 304 to determine the mobile communication system to be serviced. Accordingly, the controller 210 determines whether a channel is obtained from both 1x and 2G networks in step 306. If the controller 210 acquires a channel from both the 1x system and the 2G system, the controller 210 preferentially selects the 1x system in step 308. In addition, the controller 210 continues to attempt to acquire the 1x system by periodically searching for the 1x network even if the 2x channel is acquired by missing the 1x channel in the region where the 1x network and the 2G network overlap as described above. .

이어서 본 발명에 따른 cdma2000 1x 이동통신단말기의 제어부(210)는 단계 310에서 지속적으로 RSSI 및 Ec/Io값을 내부적으로 설정한 임계값 이하로 일정 시간 이상 계속되는 지를 검사한다. Ec/Io(Energy Carrier-to-Interference Density)은 수신대역에서 총전력 스펙트럼 밀도에 대한 하나의 PN칩 기간 동안 누적된 파일롯 에너지의 비율을 dB로 표시한 값이다. RSSI(Received Signal Strength Indication)은 수신기의 측정 회로로 인해 생성된 수신기 입력에서의 평균신호 강도 지수이다. 이러한 Ec/Io 및 RSSI 값은 현재 cdma2000 1x 이동통신단말기가 현재 시스템으로부터 얼마나 잘 서비스 받을 수 있는 지를 나타내는 전파의 세기이다. 즉, Ec/Io 및 RSSI 값이 소정의 임계값 이상이 되어야 cdma2000 1x 이동통신단말기가 원활한 서비스를 받을 수 있음을 의미한다.Subsequently, the control unit 210 of the cdma2000 1x mobile communication terminal according to the present invention continuously checks in step 310 whether the RSSI and Ec / Io values continue to be equal to or less than a predetermined time which is set internally. Energy Carrier-to-Interference Density (EC / Io) is the ratio of the pilot energy accumulated in one PN chip period to the total power spectral density in the receive band in dB. Received Signal Strength Indication (RSSI) is an average signal strength index at the receiver input generated by the receiver's measurement circuitry. These Ec / Io and RSSI values are the strength of radio waves that indicate how well a cdma2000 1x mobile terminal can be serviced from the current system. That is, when the Ec / Io and RSSI values are equal to or greater than a predetermined threshold value, the cdma2000 1x mobile communication terminal can receive a smooth service.

본 발명에 따른 cdma2000 1x 이동통신단말기의 제어부(210)는 RSSI 및 Ec/Io값이 소정 설정한 임계값 이하로 일정 시간 이상 계속되면 단계 314로 진행하여 불안정한 1x 망을 통해 서비스 받는 것을 중지하고 중첩된 전파의 환경이 훨씬 우수한 2G 망을 통해 서비스 받도록 2G 시스템을 선택한다. 이후 cdma2000 1x 이동통신단말기는 서비스 받을 이동통신단말기를 선택한 후 단계 316에서 아이들 상태(idle state)가 된다.The control unit 210 of the cdma2000 1x mobile communication terminal according to the present invention proceeds to step 314 when the RSSI and Ec / Io values continue below a predetermined threshold for more than a predetermined time, and stops receiving the service through the unstable 1x network and overlaps. The 2G system is selected to be serviced through the 2G network which has a much better radio environment. Thereafter, the cdma2000 1x mobile communication terminal selects a mobile communication terminal to be serviced and becomes an idle state in step 316.

이와 같이 본 발명에 따른 cdma2000 1x 이동통신단말기는 1x망과 2G망이 중첩된 영역에서 우선적으로 1x 시스템을 획득하더라도 대기 상태에서 지속적으로 RSSI 및 Ec/Io 값을 모니터링하여 내부적으로 설정한 임계값 이하로 일정 시간 이상 계속되면 불안정한 1x 채널로부터 서비스 받는 것을 중지하고 2G 채널로 전환하도록 구성된다.As described above, the cdma2000 1x mobile communication terminal according to the present invention continuously monitors RSSI and Ec / Io values in the standby state, even if the 1x system is obtained preferentially in the region where the 1x network and the 2G network overlap. If it continues for a certain time, it stops receiving service from unstable 1x channel and switches to 2G channel.

전술한 본 발명에 의하면, cdma2000 1x 이동통신단말기는 1x망과 2G망이 중첩된 지역에서 우선적으로 1x 시스템을 획득하여 1x 서비스 가능하게 하지만, 1x 채널의 환경이 좋지 않을 시에도 단말기는 내부적 판단 루틴에 따라 2G 채널로 이동함으로써 보다 원활한 채널 환경에서 서비스 받을 수 있는 이점이 있다.According to the present invention described above, the cdma2000 1x mobile communication terminal preferentially acquires the 1x system in a region where the 1x network and the 2G network overlap, and enables 1x service. However, even when the environment of the 1x channel is not good, the terminal has an internal determination routine. By moving to the 2G channel according to the advantage that can be serviced in a smoother channel environment.

Claims (2)

cdma2000 1x 이동통신단말기의 이동통신시스템 획득 방법에 있어서,A method for acquiring a mobile communication system of a cdma2000 1x mobile communication terminal, 1x망과 2G망이 중첩된 영역에서 1x 시스템을 우선적으로 획득하는 단계와,Firstly acquiring a 1x system in a region where 1x and 2G networks overlap; 상기 1x 시스템으로부터 수신되는 전파의 세기를 측정하여 임계값 이하로 소정 시간 이상 계속되는 지를 검사하는 단계와,Measuring the intensity of the radio wave received from the 1x system and checking whether it continues for a predetermined time or less below a threshold value; 상기 측정한 전파의 세기가 임계값 이하로 소정 시간 이상 계속되면 상기 2G 시스템을 획득하여 서비스를 받는 단계를 포함하는 것을 특징으로 하는 이동통신시스템 획득 방법.And acquiring the 2G system and receiving a service when the measured intensity of the radio wave continues below a threshold for more than a predetermined time. 제1항에 있어서, 상기 전파의 세기를 RSSI 및 Ec/Io값을 이용하여 측정하는 단계를 더 포함하는 것을 특징으로 하는 이동통신시스템 획득 방법.The method of claim 1, further comprising measuring the strength of the radio wave using RSSI and Ec / Io values.
KR1020010068977A 2001-11-06 2001-11-06 Method for acquiring mobile communication systems in a cdma2000 1x mobile communication terminal equipment KR20030037884A (en)

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JPH11285048A (en) * 1998-03-30 1999-10-15 Nec Corp Is-95 base station device, w-cdma base station device, mobile communication system and method for using frequency in common
EP1006746A2 (en) * 1998-12-02 2000-06-07 Infineon Technologies North America Corp. Soft handoff between second and third generation CDMA systems
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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH11285048A (en) * 1998-03-30 1999-10-15 Nec Corp Is-95 base station device, w-cdma base station device, mobile communication system and method for using frequency in common
EP1006746A2 (en) * 1998-12-02 2000-06-07 Infineon Technologies North America Corp. Soft handoff between second and third generation CDMA systems
WO2000042808A1 (en) * 1999-01-14 2000-07-20 Ericsson, Inc. Broadcasting of two generation cellular system control channel information over a three generation control channel to support roaming and handover to two generation cellular networks
KR100369321B1 (en) * 2000-08-18 2003-01-24 주식회사 팬택앤큐리텔 Method for handover from 3G communication system to 2G communication system

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