KR101046148B1 - How to switch the mode of dual band dual mode terminal - Google Patents

How to switch the mode of dual band dual mode terminal Download PDF

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KR101046148B1
KR101046148B1 KR1020040063584A KR20040063584A KR101046148B1 KR 101046148 B1 KR101046148 B1 KR 101046148B1 KR 1020040063584 A KR1020040063584 A KR 1020040063584A KR 20040063584 A KR20040063584 A KR 20040063584A KR 101046148 B1 KR101046148 B1 KR 101046148B1
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cdma
mode
cell
channel
dual
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KR20060014863A (en
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유경수
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엘지전자 주식회사
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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
    • H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/02—Terminal devices
    • H04W88/06—Terminal devices adapted for operation in multiple networks or having at least two operational modes, e.g. multi-mode terminals

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Abstract

본 발명은 듀얼밴드듀얼모드(DBDM) 단말기의 모드 전환 방법에 관한 것으로 특히, W-CDMA와 CDMA가 동시에 지원되는 중첩 지역에서 발생하는 핑퐁(ping-pong) 현상에 의한 통화 불능 상태를 최소화할 수 있도록 함에 목적이 있다. 이러한 목적의 본 발명은 CDMA와 W-CDMA 중첩 지역으로 진입되어 W-CDMA 중첩 인디케이터가 온되면 W-CDMA 모뎀을 온시키는 단계와, 현재 채널을 마지막 채널로 저장하고 CDMA에서 W-CDMA로 RF 스위칭함과 동시에 CDMA 모뎀을 오프시키는 단계와, 우선순위의 모드가 W-CDMA 모드로 확인되면 W-CDMA 채널을 탐색하는 단계와, 상기에서 W-CDMA 채널이 탐색되면 Cell ID 경계지역의 Cell ID를 2개 저장하는 단계와, CDMA와 W-CDMA 중첩 지역으로 진입되면 현재 수신되는 Cell ID를 상기 저장된 Cell ID와 비교하여 적어도 하나가 일치되면 백오프 카운트 타이머(backoff count timer)를 동작시켜 현재 망을 유지시키는 단계를 수행하여 망 이동에 따른 핑퐁 현상을 방지하도록 구성함을 특징으로 한다. The present invention relates to a mode switching method of a dual-band dual mode (DBDM) terminal, and in particular, it is possible to minimize the incapacity due to the ping-pong phenomenon occurring in the overlapped region where W-CDMA and CDMA are simultaneously supported. The purpose is to make it work. The present invention for this purpose is to enter the CDMA and W-CDMA overlap region and to turn on the W-CDMA modem when the W-CDMA overlap indicator is on, storing the current channel as the last channel and RF switching from CDMA to W-CDMA Turning off the CDMA modem; searching for a W-CDMA channel when the priority mode is determined to be a W-CDMA mode; Storing two and comparing the currently received Cell ID with the stored Cell ID when entering the overlapping region of the CDMA and W-CDMA and operating the backoff count timer if at least one is matched. It characterized in that it is configured to prevent the ping-pong phenomenon due to the network movement by performing the step of maintaining.

Description

듀얼밴드듀얼모드(ＤＢＤＭ) 단말기의 모드 전환 방법{MODE SWITCHING METHOD FOR DUAL BAND DUAL MODE TERMINAL DEVICE} MODE SWITCHING METHOD FOR DUAL BAND DUAL MODE TERMINAL DEVICE}

도1은 본 발명의 실시 예에 따른 CDMA 망과 W-CDMA 망의 중첩 지역에서 Cell ID 저장 과정을 보인 신호 흐름도이다. 1 is a signal flow diagram illustrating a Cell ID storage process in an overlapping region of a CDMA network and a W-CDMA network according to an embodiment of the present invention.

본 발명은 이동통신단말기에 관한 것으로 특히, 듀얼밴드듀얼모드(DBDM : Dual Band Dual Mode) 단말기에 있어서 모드 전환 방법에 관한 것이다. The present invention relates to a mobile communication terminal, and more particularly, to a mode switching method in a dual band dual mode (DBDM) terminal.

이동통신시스템은 음성통화만을 서비스하는 아날로그 방식의 제1세대를 거쳐 제2세대에서 음성통화서비스는 물론 팩스, 데이터 서비스가 추가되어 디지털 통신이 가능하게 되었다. The mobile communication system has passed through the first generation of the analog system that only provides voice calls, and in the second generation, digital communication is enabled by the addition of voice call services, fax and data services.

제2세대 이동통신시스템은 북미의 CDMA(Code Division Multiple Access) 방식과 유럽의 GSM(Global System for Mobile Communications) 방식으로 양분된다. The second generation mobile communication system is divided into the North American Code Division Multiple Access (CDMA) method and the European Global System for Mobile Communications (GSM) method.

현재 이동통신시스템은 제3세대에 진입하였다고 할 수 있다. At present, the mobile communication system has entered the third generation.

제3세대에서는 이전 세대보다 더욱 신뢰할 수 있고 융통성 있는 통신 서비스 즉, 고속의 데이터 서비스와 새로운 비디오, 오디오 서비스, 인터넷 접속이 가능하 게 되었다. In the third generation, more reliable and flexible communication services are available than in previous generations: high-speed data services, new video and audio services, and Internet access.

제3세대 이동통신시스템은 북미를 대표하는 동기방식의 CDMA2000과 유럽을 대표하는 비동기방식의 UMTS(Universal Mobile Telecommunications System)로 양분된다. The third generation mobile communication system is divided into CDMA2000, which represents North America, and UMTS (Universal Mobile Telecommunications System), which represents Europe.

하지만, 한 지역이나 국가에 이미 설치된 통신시스템은 비용 문제와 장비 확보 및 설치 기간이 필요하기 때문에 빠른 시일 내에 새로운 통신 시스템으로 모두 바뀔 수 없기 때문에 제2세대 이동통신시스템과 제3세대 이동통신시스템이 동일 지역 또는 국가 내에서 일정 기간 공존할 수밖에 없다. However, since the communication system already installed in one region or country cannot be replaced with the new communication system as soon as it requires cost and equipment acquisition and installation period, the second and third generation mobile communication systems are Only coexist within the same region or country for a certain period of time.

따라서, 3세대 이동통신시스템에서는 글로벌 로밍 네트워크 시스템(Global Roaming Network System)을 지원하는 멀티모드(Multi-Mode) 단말기의 개발이 요구되었다. Accordingly, in the third generation mobile communication system, development of a multi-mode terminal supporting a global roaming network system has been required.

현재 CDMA는 물론 W-CDMA(Wideband-Code Division Multiple Access)가 지원되는 듀얼밴드듀얼모드(이하 "DBDM"이라 칭함) 단말기의 개발이 진행되고 있다. Currently, the development of dual-band dual mode (hereinafter referred to as "DBDM") terminals supporting W-CDMA (Wideband-Code Division Multiple Access) as well as CDMA is in progress.

그런데, DBDM 단말기는 CDMA 망과 W-CDMA 망이 동시에 지원되는 상황이 발생할 수 있다. 즉, CDMA 및 W-CDMA가 지원되는 DBDM 단말기는 CDMA 망에 접속된 상태에서 W-CDMA 망으로 상호시스템 변경(intersystem change)이 발생하거나 W-CDMA 망에 접속된 상태에서 CDMA 망으로 상호시스템 변경이 발생할 수 있다. However, a situation in which a DBDM terminal supports a CDMA network and a W-CDMA network at the same time may occur. That is, a DBDM terminal supporting CDMA and W-CDMA has an intersystem change to the W-CDMA network when connected to the CDMA network, or changes to the CDMA network when connected to the W-CDMA network. This can happen.

현재 개발된 DBDM 단말기는 W-CDMA 망에 접속된 상태에서 W-CDMA/CDMA 경계지역에 진입하였을 때 RSCP(Received Signal Code Power)가 "-105dB" 이하로 5초 이상 지속되면 CDMA 모드로 전환된다. The DBDM terminal that is currently developed is switched to CDMA mode when RSCP (Received Signal Code Power) lasts for more than 5 seconds when it enters W-CDMA / CDMA boundary when connected to W-CDMA network. .                         

이후, CDMA 모드에서 W-CDMA 모드로 전환될 경우에 DBDM 단말기는 CDMA 망에서 페이징 채널(paging channel)로 전송되는 SPM(System Parameter Message) 내의 인디케이터 필드(indicator field)의 값(Base ID 또는 Base Class)에 따라 W-CDMA 망으로 다시 전환된다. Subsequently, when switching from CDMA mode to W-CDMA mode, the DBDM terminal transmits a value of an indicator field (base ID or base class) in an SPM (System Parameter Message) transmitted from a CDMA network to a paging channel. Switch back to W-CDMA network.

이때, 경계 지역에서 무분별한 핑퐁 현상이 발생함으로 백오프 카운트 타이머(Backoff count timer)를 구비하여 W-CDMA의 Cell ID의 동일 유무에 따라 단말기가 CDMA 모드에서 지수적(exponential)으로 W-CDMA 망으로 찾는다. At this time, indiscriminate ping-pong phenomenon occurs in the border area, so it is equipped with a backoff count timer so that the terminal exponentially enters the W-CDMA network in CDMA mode according to whether or not the cell ID of W-CDMA is the same. Find.

그러나, 실제 CDMA와 W-CDMA 중첩(overlay) 지역에서 W-CDMA 망 내부의 Cell ID 경계지역에서는 여전히 무분별한 핑퐁 현상이 발생하는 문제점이 있다. However, there is still a problem that indiscriminate ping-pong phenomenon occurs in the cell ID boundary area within the W-CDMA network in the actual CDMA and W-CDMA overlay area.

즉, 종래에는 CDMA와 W-CDMA 중첩 지역일 경우 W-CDMA 망 내부의 Cell ID 경계 지역에서는 Cell ID가 변경될 때마다 백오프 카운트 값이 "0"이 되기 때문에 CDMA 망에 연결 상태를 유지하다가 SPM 내의 인디케이터 필드(indicator field)의 값(base class of Base ID)이 수신될 때마다 W-CDMA 망으로 모드 전환하고, 다시 RSCP에 의해 CDMA 망으로 가면 W-CDMA Cell ID 경계 지역이므로 이전에 받았던 Cell ID가 현재와 다를 경우 다시 백오프 카운트가 "0"이 되어 W-CDMA 망으로 가는 핑퐁 현상의 악순환이 계속되는 문제점이 있다. That is, in the conventional CDMA and W-CDMA overlap regions, the backoff count value is "0" every time the Cell ID is changed in the cell ID boundary of the W-CDMA network, so that the connection state is maintained in the CDMA network. Whenever the value of the indicator field (base class of Base ID) in the SPM is received, the mode is switched to the W-CDMA network, and when it is returned to the CDMA network by RSCP again, it is a W-CDMA Cell ID boundary area. If the cell ID is different from the current one, the backoff count becomes "0" and the vicious cycle of ping-pong phenomenon to the W-CDMA network continues.

현재 네트워크 중첩 지역에서의 W-CDMA 망의 Cell ID 경계지역에서 발생하는 핑퐁 현상에 대한 해결 기술이 제시되어 있지 않다. Currently, there is no solution to the ping-pong phenomenon occurring at the cell ID boundary of the W-CDMA network in the network overlapping area.

따라서, 본 발명은 종래의 문제점을 개선하기 위하여 W-CDMA와 CDMA가 동시 에 지원되는 중첩 지역에서 발생하는 핑퐁(ping-pong) 현상에 의한 통화 불능 상태를 최소화할 수 있도록 창안한 듀얼밴드듀얼모드(DBDM) 단말기의 모드 전환 방법을 제공함에 목적이 있다. Accordingly, the present invention provides a dual-band dual mode to minimize the incapacity caused by the ping-pong phenomenon occurring in the overlapped region where W-CDMA and CDMA are simultaneously supported to improve the conventional problems. (DBDM) An object of the present invention is to provide a mode switching method of a terminal.

본 발명은 상기의 목적을 달성하기 위하여 CDMA와 W-CDMA 중첩 지역으로 진입되어 W-CDMA 중첩 인디케이터가 온되면 W-CDMA 모뎀을 온시키는 단계와, 현재 채널을 마지막 채널로 저장하고 CDMA에서 W-CDMA로 RF 스위칭함과 동시에 CDMA 모뎀을 오프시키는 단계와, 우선순위의 모드가 W-CDMA 모드로 확인되면 W-CDMA 채널을 탐색하는 단계와, 상기에서 W-CDMA 채널이 탐색되면 Cell ID 경계지역의 Cell ID를 2개 저장하는 단계와, CDMA와 W-CDMA 중첩 지역으로 진입되면 현재 수신되는 Cell ID를 상기 저장된 Cell ID와 비교하여 적어도 하나가 일치되면 백오프 카운트 타이머(backoff count timer)를 동작시켜 현재 망을 유지시키는 단계를 수행하여 망 이동에 따른 핑퐁 현상을 방지하도록 구성함을 특징으로 한다. In order to achieve the above object, the present invention provides a step of entering a CDMA and W-CDMA overlap region and turning on the W-CDMA modem when the W-CDMA overlap indicator is turned on, storing the current channel as the last channel, and storing W- in CDMA. Turning off the CDMA modem at the same time as RF switching to CDMA, searching for the W-CDMA channel when the priority mode is identified as the W-CDMA mode, and searching for the W-CDMA channel when the W-CDMA channel is detected. Storing two Cell IDs; and entering a CDMA and W-CDMA overlapping area, comparing a currently received Cell ID with the stored Cell ID and operating a backoff count timer if at least one is matched. It is characterized in that the configuration to prevent the ping-pong phenomenon due to the network movement by performing the step of maintaining the current network.

이하, 본 발명을 도면에 의거 상세히 설명하면 다음과 같다. Hereinafter, the present invention will be described in detail with reference to the drawings.

도1은 CDMA 망과 W-CDMA 망의 중첩 지역에서 W-CDMA 모드 대기 상태에서 Cell ID를 저장하는 과정을 도시한 신호 흐름도이다. 1 is a signal flow diagram illustrating a process of storing a Cell ID in a W-CDMA mode standby state in an overlapping region of a CDMA network and a W-CDMA network.

도1에 도시한 바와 같이 본 발명은 CDMA와 W-CDMA 중첩 지역으로 진입되어 W-CDMA 중첩 인디케이터가 온되면 W-CDMA 모뎀을 온시키는 단계와, 현재 채널을 마지막 채널로 저장하고 CDMA에서 W-CDMA로 RF 스위칭함과 동시에 CDMA 모뎀을 오프시키는 단계와, 미리 지정된 모드가 W-CDMA 모드로 확인되면 W-CDMA 채널을 탐색하는 단계와, 상기에서 W-CDMA 채널이 탐색되면 Cell ID 경계지역의 Cell ID를 2개 저장하는 단계와, CDMA와 W-CDMA 중첩 지역으로 진입되면 현재 수신되는 Cell ID를 상기 저장된 Cell ID와 비교하여 적어도 하나가 일치되면 백오프 카운트 타이머(backoff count timer)를 동작시켜 망 이동에 따른 핑퐁 현상을 방지하는 단계를 수행하도록 구성한다. As shown in FIG. 1, the present invention provides a method of entering a CDMA and W-CDMA overlap region and turning on the W-CDMA modem when the W-CDMA overlap indicator is turned on, storing the current channel as the last channel, and storing W- in CDMA. Turning off the CDMA modem at the same time as RF switching to the CDMA, searching for the W-CDMA channel when the predetermined mode is identified as the W-CDMA mode, and searching for the W-CDMA channel when the W-CDMA channel is detected. Storing two Cell IDs; and entering a CDMA and W-CDMA overlapping area, comparing a currently received Cell ID with the stored Cell ID, and operating a backoff count timer if at least one is matched. It is configured to perform the step of preventing the ping-pong phenomenon due to the network movement.

이와 같이 구성한 본 발명의 실시 예에 대한 동작 및 작용 효과를 설명하면 다음과 같다. Referring to the operation and effect of the embodiment of the present invention configured as described above are as follows.

이동통신단말기가 CDMA 망에서 W-CDMA 망으로 이동하면서 CDMA 망과 WCDMA 망의 경계지역에 진입하면 CDMA 망에서는 W-CDMA 중첩 인디케이터(base Class 또는 base ID)를 상기 이동통신단말기에 전송한다. When the mobile communication terminal moves from the CDMA network to the W-CDMA network and enters the boundary area of the CDMA network and the WCDMA network, the CDMA network transmits a W-CDMA overlap indicator (base class or base ID) to the mobile communication terminal.

이때, 이동통신단말기는 W-CDMA 중첩 인디케이터가 수신되면 W-CDMA 모뎀을 온시키고 동시에 스위칭 타이머를 온시킨다. In this case, when the W-CDMA overlap indicator is received, the mobile communication terminal turns on the W-CDMA modem and simultaneously turns on the switching timer.

이후, 타이머가 종료된 상태에서 송신호 또는 수신호가 발생되면 이동통신단말기는 W-CDMA 모뎀을 오프시킨 후 CDMA 호출을 처리한다. Thereafter, if a transmission call or a hand signal occurs while the timer expires, the mobile communication terminal turns off the W-CDMA modem and processes the CDMA call.

또한, 타이머가 종료된 상태에서 송신호 또는 수신호가 발생하지 않는 경우 현재 채널을 마지막 채널로 저장하고 CDMA에서 W-CDMA로 모드 전환하기 위한 RF 스위칭을 수행한 후 CDMA 모뎀을 오프시킨다. In addition, when the transmission call or the hand signal does not occur when the timer expires, the CDMA modem is turned off after performing the RF switching to store the current channel as the last channel and to switch the mode from CDMA to W-CDMA.

이후, 우선순위의 모드(preferred mode)가 W-CDMA 모드로 확인되면 이동통신단말기는 W-CDMA 채널을 탐색하게 된다. Thereafter, if the preferred mode is determined as the W-CDMA mode, the mobile communication terminal searches for the W-CDMA channel.

이에 따라, W-CDMA 채널이 발견되면 이동통신단말기는 W-CDMA 모드의 동작을 대기하면서 CDMA 망과 W-CDMA 망의 경계지역에서의 Cell ID를 고려하여 셀간 핸드오버(handover) 시의 2개의 Cell ID 즉, 핸드오버 이전의 Cell ID와 핸드오버 이후의 Cell ID를 모두 저장한다. Accordingly, when the W-CDMA channel is found, the mobile communication terminal waits for operation of the W-CDMA mode and considers the cell IDs at the boundary area of the CDMA network and the W-CDMA network. Stores both Cell ID, that is, Cell ID before handover and Cell ID after handover.

이후, CDMA 망에서 백오프 카운트 동작이 필요한 경우 백오프 카운트 동작 이전에 Cell ID를 상기 과정에서 저장한 2개의 Cell ID와 비교하고 비교결과가 하나만이라도 일치하면 백오프 카운트 타이머를 동작시켜 W-CDMA 망으로의 전환을 방지함으로써 CDMA 망과 W-CDMA 망의 셀 경계지역에서 핑퐁 현상을 방지하게 된다. After that, if the backoff count operation is required in the CDMA network, the cell ID is compared with the two cell IDs stored in the above process before the backoff count operation. Preventing the switching to the network prevents the ping-pong phenomenon at the cell boundary of the CDMA network and the W-CDMA network.

상기에서 상세히 설명한 바와 같이 본 발명은 듀얼밴듀얼모드 단말기가 CDMA 망과 W-CDMA 망의 경계지역에서 백오프 카운트 동작 이전에 미리 저장한 2개의 Cell ID와 현재의 Cell ID를 비교하여 하나라도 일치하면 백오프 카운트 동작을 수행함으로써 핑퐁 현상을 방지하여 망의 부하를 감소시킬 수 있는 효과가 있다. As described in detail above, the present invention compares two cell IDs stored in advance before the backoff count operation in the boundary area between the CDMA network and the W-CDMA network and the current Cell ID. In this case, it is possible to reduce the load on the network by preventing the ping-pong phenomenon by performing the back-off count operation.

Claims (3)

CDMA와 W-CDMA 중첩 지역에서 핸드오버 이전과 이후에 해당하는 2개의 Cell ID를 저장하는 단계와, Storing two cell IDs before and after handover in the CDMA and W-CDMA overlap regions; CDMA와 W-CDMA 중첩 지역에서 현재 수신되는 Cell ID를 상기 저장된 Cell ID와 비교하는 단계와, Comparing a cell ID currently received in a CDMA and W-CDMA overlap region with the stored Cell ID; 상기 비교 결과가 하나라도 일치하면 현재 모드를 유지시키는 단계를 포함하며, 상기 Cell ID를 저장하는 단계는 And maintaining the current mode if any of the comparison results match, and storing the Cell ID CDMA와 W-CDMA 중첩 지역에서 W-CDMA 중첩 인디케이터가 온되면 W-CDMA 모뎀을 온시키는 과정과, Turning on the W-CDMA modem when the W-CDMA overlap indicator is turned on in the CDMA and W-CDMA overlap regions; 현재 채널을 마지막 채널로 저장하고 CDMA에서 W-CDMA로 RF 스위칭함과 동시에 CDMA 모뎀을 오프시키는 과정과, Saving the current channel as the last channel and turning off the CDMA modem simultaneously with RF switching from CDMA to W-CDMA; 우선순위의 모드가 W-CDMA 모드로 확인되면 W-CDMA 채널을 탐색하는 단계와, Searching for a W-CDMA channel when the priority mode is determined to be a W-CDMA mode; 상기에서 W-CDMA 채널이 탐색되면 Cell ID 경계지역의 2개의 Cell ID를 저장하는 과정으로 구성된 것을 특징으로 하는 듀얼밴드듀얼모드(DBDM) 단말기의 모드 전환 방법. If the W-CDMA channel is detected, the method for switching the mode of the dual-band dual mode (DBDM) terminal, characterized in that the process consisting of storing two Cell ID of the cell ID boundary region. 삭제delete 제1항에 있어서, 상기 현재 모드를 유지시키는 단계는,The method of claim 1, wherein maintaining the current mode comprises: 백오프 카운트 타이머(backoff count timer)를 동작시킴으로써 현재 모드를 유지시키도록 이루어진 것을 특징으로 하는 듀얼밴드듀얼모드(DBDM) 단말기의 모드 전환 방법.A method of mode switching in a dual band dual mode (DBDM) terminal, characterized in that the current mode is maintained by operating a backoff count timer.
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