KR20040062037A - Communication type switching method for mobile communication terminal device - Google Patents
Communication type switching method for mobile communication terminal device Download PDFInfo
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- KR20040062037A KR20040062037A KR1020020088349A KR20020088349A KR20040062037A KR 20040062037 A KR20040062037 A KR 20040062037A KR 1020020088349 A KR1020020088349 A KR 1020020088349A KR 20020088349 A KR20020088349 A KR 20020088349A KR 20040062037 A KR20040062037 A KR 20040062037A
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Abstract
Description
본 발명은 이동통신 시스템에 관한 것으로 특히, 통신 방식 전환 방법에 관한 것이다.The present invention relates to a mobile communication system, and more particularly, to a communication method switching method.
이동통신 기술이 발전하면서 다양한 속도의 데이터 전송이 필요하게 되었다.As mobile communication technology develops, data transmission at various speeds is required.
따라서, 통화 채널의 데이터 전송 속도를 구분하여야 하며 이를 위해 채널(channelization) 부호를 사용한다.Therefore, the data transmission rate of the call channel should be distinguished and a channelization code is used for this purpose.
차세대 디지털 이동통신 방식의 일종으로 스펙트럼 확산 기술을 채택한 방식은 CDMA(부호 분할 다중 접속 : Code Division Multiple Access)가 제시되어 있다.Code division multiple access (CDMA) is proposed as a method of adopting spread spectrum technology as a kind of next generation digital mobile communication method.
CDMA는 미국 퀄컴(Qualcomm)사에서 제안한 것으로, 복수의 사용자가 같은 주파수 대역을 공유할 수 있다.CDMA is proposed by Qualcomm, Inc., and multiple users can share the same frequency band.
이를 위해 사용자 통신 채널 고유의 의사 잡음 부호(PN 부호)를 사용하여 사용자를 구분하는데, 송신 측에서는 클럭 주파수가 음성 데이터 주파수 대역폭의 수십 배 이상의 PN 부호를 음성 데이터에 곱하여 주파수 대역을 확산하고, 수신 측에서는 송신 시와 동일한 PN 부호를 곱하여 원래의 대역폭으로 복조한다.To this end, users are distinguished by using a pseudo noise code (PN code) unique to the user communication channel. On the transmitting side, the clock frequency multiplies the voice data by a PN code at least several times the voice data frequency bandwidth, and spreads the frequency band on the receiving side. Demodulate to original bandwidth by multiplying the same PN code as in transmission.
또한, 국제 전기 통신 연합(ITU)이 표준화를 추진하고 있는 국제 이동 통신-2000(IMT-2000)을 위해 부호 분할 다중 접속(CDMA) 방식을 광대역화하는 기술로서, WCDMA(광대역 부호분할 다중접속 : Wideband Code Division Multiple Access) 방식이 제시되어 있다.In addition, WCDMA (Wideband Code Division Multiple Access) is a technology for widening the code division multiple access (CDMA) scheme for the International Mobile Communication 2000 (IMT-2000), which is being promoted by the International Telecommunication Union (ITU). Code Division Multiple Access) is proposed.
이에 따라, 현재 기존망(CDMA, cdma2000-1x 및 EV-DO)과 W-CDMA망을 모두 사용할 수 있는 DBDM((Dual Band Dual Mode) 단말기가 개발되고 있거나 개발이 완료되어 상용화를 앞두고 있다.Accordingly, DBDM (Dual Band Dual Mode) terminals, which can use both existing networks (CDMA, cdma2000-1x and EV-DO) and W-CDMA networks, are currently being developed or are being developed and are ready for commercialization.
그러나, 현재 DBDM 단말기에 대한 시스템 획득방식이나 로밍(Roaming) 방식에 대한 기술이 제시되어 있지 않다.However, there is currently no description of a system acquisition method or a roaming method for a DBDM terminal.
따라서, 본 발명은 종래의 문제점을 개선하기 위하여 CDMA와 WCDMA 통신 프로토콜을 모두 탑재한 단말기에 있어서, 시스템 획득 및 CDMA와 WCDMA 간의 핸드오버(Handover)를 가능하도록 창안한 이동통신 단말기의 통신 방식 전환 방법을 제공함에 목적이 있다.Accordingly, the present invention provides a method for switching a communication method of a mobile communication terminal invented to enable system acquisition and handover between CDMA and WCDMA in a terminal equipped with both CDMA and WCDMA communication protocols in order to solve the conventional problems. The purpose is to provide.
특히 , 본 발명은 CDMA와 WCDMA 프로토콜을 별도로 사용하는 단말기에 적당하도록 시스템 획득 및 로밍 방법을 제공함에 목적이 있다.In particular, it is an object of the present invention to provide a system acquisition and roaming method suitable for a terminal using a separate CDMA and WCDMA protocol.
도1은 본 발명의 실시예에서 단말기와 이동통신사업자 서버 간의 메시지 교환 과정을 보인 신호 흐름도.1 is a signal flow diagram illustrating a message exchange process between a terminal and a mobile service provider server in an embodiment of the present invention.
도2는 본 발명의 실시예에서 CDMA와 WCDMA 간의 핸드오버 과정을 보인 동작 순서도.2 is a flowchart illustrating a handover process between CDMA and WCDMA in an embodiment of the present invention.
도3은 본 발명의 실시예에서 시스템 파라미터 메시지의 구성을 보인 예시도.Figure 3 is an exemplary view showing the configuration of a system parameter message in an embodiment of the present invention.
도4는 본 발명의 실시예에서 단말과 이동통신사업자 서버 간의 메시지 포맷을 보인 예시도.4 is an exemplary view showing a message format between a terminal and a mobile service provider server in an embodiment of the present invention.
본 발명은 상기의 목적을 달성하기 위하여 서로 다른 통신 프로토콜 예로, CDMA와 WCDMA를 모두 지원하는 단말기에 있어서, 초기에 설정된 통신 방식을 확인하는 단계와, 상기에서 확인된 통신 방식의 망을 탐색하여 상기에서 확인된 통신 방식의 신호가 발견되는지 판단하는 단계와, 상기에서 소정 시간 내에 해당 통신 방식의 신호가 발견되면 해당 통신 방식으로 통화를 진행하는 단계와, 상기에서 해당 통신 방식의 신호가 발견되지 않은 경우 다른 통신 방식을 설정하고 상기와 동일한 과정으로 통신 신호를 발견하는 단계를 수행함을 특징으로 한다.In order to achieve the above object, the present invention provides a communication protocol, for example, a terminal supporting both CDMA and WCDMA, identifying an initially established communication method, and searching for the network of the identified communication method. Determining whether a signal of the communication method identified in the above method is found; if a signal of the communication method is found within the predetermined time, performing a call in the communication method; and wherein the signal of the communication method is not found. In the case of setting a different communication method and performing the same process as above to discover the communication signal.
상기에서 통신 신호의 발견은 해당 통신 방식의 신호에 대한 전계 강도(RSSI, RSCP)를 측정하여 미리 설정된 임계치 이상인 경우 해당 통신 방식의 신호가 발견된 것으로 판단하는 것을 특징으로 한다.The discovery of the communication signal is characterized in that the electric field strength (RSSI, RSCP) for the signal of the communication method is measured and characterized in that it is determined that the signal of the corresponding communication method is found if the predetermined threshold value or more.
특히, 본 발명은 DBDM 단말기에서 CDMA와 WCDMA 간의 통화 중 핸드오버(Handover)를 가능하도록 함을 특징으로 한다.In particular, the present invention is characterized in that the DBDM terminal enables handover during a call between CDMA and WCDMA.
이하, 본 발명을 도면에 의거 상세히 설명하면 다음과 같다.Hereinafter, the present invention will be described in detail with reference to the drawings.
도1은 본 발명의 실시예에서 단말기와 이동통신 시스템 간의 메시지 교환 과정을 보인 신호 흐름도이다.1 is a signal flow diagram illustrating a message exchange process between a terminal and a mobile communication system according to an embodiment of the present invention.
이를 도3 및 도4를 참조하여 설명하면 다음과 같다.This will be described with reference to FIGS. 3 and 4 as follows.
우선, DBDM 단말기 초기화의 경우 CDMA로 통화를 설정하고 CDMA 의 시스템 파라미터(System paramter)를 통해 WCDMA와 CDMA가 공존하는 지역인지를 확인한다.First of all, in case of DBDM terminal initialization, the call is set up as CDMA and it is checked whether the area where WCDMA and CDMA coexist through CDMA system parameter.
이때, WCDMA와 CDMA가 공존하는 지역으로 확인되면 DBDM 단말기는 WCDMA 망을 탐색하라는 명령을 내부의 WCDMA 모뎀으로 준다. 여기서, 시스템 파라미터 메시지를 확인하여 BASE_CLASS 필드가 '0010'이면 WCDMA와 CDMA가 공존하는 지역으로 판단한다.At this time, if it is confirmed that WCDMA and CDMA coexist, the DBDM terminal sends a command to the internal WCDMA modem to search the WCDMA network. Here, if the BASE_CLASS field is '0010' by checking the system parameter message, it is determined as a region where WCDMA and CDMA coexist.
이에 따라, WCDMA 모뎀에서 WCDMA 셀 선택(Cell selection)이 성공되고 위치 갱신(location update)이 되면 DBDM 단말기는 PSMM(Pilot Strength Measurement Message)에 WCDMA 시스템이 발견되었다는 신호를 포함하여 CDMA 모뎀을 통해 전송한다. 여기서, PSMM 메시지에 포함되는 OP_MODE 필드가 '0'이면 CDMA, '1'이면 WCDMA임을 시스템에 보고한다.Accordingly, when the WCDMA cell selection is successful and the location update is performed in the WCDMA modem, the DBDM terminal transmits the signal through the CDMA modem including a signal indicating that the WCDMA system is found in a pilot strength measurement message (PSMM). . Here, if the OP_MODE field included in the PSMM message is '0', CDMA is reported. If the OP_MODE field is '1', WCDMA is reported to the system.
이때, DBDM 단말기가 WCDMA 시스템을 발견하였음을 확인하면 상기 WCDMA 시스템은 WCDMA 망으로 페이징(Paging) 신호를 전송하여 통화를 열고 통화가 되면 DBDM 단말기는 CDMA 모뎀을 통하여 해제 명령(Release order)을 기지국으로 전송한다. 여기서, 해제 명령(Release Order)은 ORDQ 필드를 '00000011'로 세팅함으로써 CDMA에서 WCDMA로 호가 연결됨을 알린다.At this time, if the DBDM terminal finds that the WCDMA system is found, the WCDMA system transmits a paging signal to the WCDMA network to open a call and when the call is made, the DBDM terminal issues a release order to the base station through the CDMA modem. send. Here, the release order (Release Order) informs that the call is connected from the CDMA to WCDMA by setting the ORDQ field to '00000011'.
즉, DBDM 단말기가 WCDMA 시스템을 발견하면 WCDMA 시스템은 기지국을 탐색하고 기지국이 탐색된 경우 시스템 정보를 전송한 후 통화 대기 상태로 진입시킨다. 이후, 단말기에서의 호 발신 요구 또는 시스템으로부터의 호 착신 요구가 발생되면 단말기와 시스템 프로토콜 개체(protocol entity)인 RRC에서 RRC 연결 요청이 있으면 RRC 연결 셋업(connection setup) 절차를 수행한다. 상기에서 RRC 연결 셋업(connection setup) 절차가 종료되면 음성이나 데이터 등의 사용자의 통신 데이터(traffic)가 송수신되는 연결 모드(connected mode)로 진입하게 된다. 이후, 연결 모드(connected mode)에서는 사용자의 통신 데이터(traffic)의 송수신을 진행시키면서 동시에 현재 설정되어진 채널의 에러 유무를 지속적으로 감시하게 된다.That is, when the DBDM terminal discovers the WCDMA system, the WCDMA system searches for the base station and, when the base station is found, transmits system information and enters a call waiting state. Then, when a call origination request from the terminal or a call reception request from the system is generated, an RRC connection setup procedure is performed if there is an RRC connection request from the RRC which is a terminal and a system protocol entity. When the RRC connection setup procedure ends, the user enters a connected mode in which user's communication data such as voice or data is transmitted and received. Thereafter, in the connected mode, the transmission and reception of the user's communication data is progressed, and at the same time, the presence or absence of an error of the currently set channel is continuously monitored.
이에 따라, 기지국이 CDMA 망의 호를 닫게 되어 WCDMA 망으로의 핸드오버(Handover)가 이루어진다.As a result, the base station closes the call of the CDMA network to perform a handover to the WCDMA network.
상기에서 메시지 필드는 도3의 예시도에 도시한 바와 같으며, DBDM 단말기와 시스템 간의 메시지 포맷은 도4의 예시도에 도시한 바와 같다.The message field is as shown in the exemplary diagram of FIG. 3, and the message format between the DBDM terminal and the system is as shown in the exemplary diagram of FIG.
한편, 본 발명의 실시예에서 CDMA와 WCDMA 간의 핸드오버 과정은 도2의 동작 순서도와 동일한 과정으로 이루어진다.Meanwhile, in the embodiment of the present invention, the handover process between CDMA and WCDMA is performed in the same process as the flowchart of FIG.
여기서, DBDM 단말기는 사용자 초기 설정이 WCDMA라 가정하여 설명하기로 한다.Here, the DBDM terminal will be described assuming that the user initial setting is WCDMA.
우선, DBDM 단말기를 초기화할 때 사용자 초기 설정이 WCDMA으로 확인되면 WCDMA 망을 탐색하면서 탐색 신호의 전계 강도(RSSI, RSCP)를 측정하여 WCDMA 신호가 발견되는지 확인하게 된다.First, when initializing a DBDM terminal, if the user initial setting is confirmed as WCDMA, the WCDMA network is searched to measure the electric field strength (RSSI, RSCP) of the discovery signal to determine whether the WCDMA signal is found.
상기에서 WCDMA 신호가 발견된 경우 WCDMA 망으로 접속하고 주기적으로 WCDMA 신호를 탐색한다.If the WCDMA signal is found, the WCDMA network is periodically searched for.
만일, 초기에 WCDMA 신호가 발견되지 않았거나 또는 WCDMA 접속 상태에서WCDMA 신호가 탐색되지 않는 경우 타이머를 구동하면서 소정 시간 내에 WCDMA 신호가 발견되는지 확인한다. 이에 따라, 소정 시간 내에 WCDMA 신호가 발견되면 WCDMA 망 접속 상태를 유지한다.If no WCDMA signal is found initially or no WCDMA signal is found in the WCDMA connection, the timer is checked to see if the WCDMA signal is found within a predetermined time period. Accordingly, if a WCDMA signal is found within a predetermined time, the WCDMA network connection state is maintained.
만일, 상기에서 소정 시간 내에 WCDMA 신호가 발견되지 않는 경우 CDMA 방식으로 전환하여 CDMA 신호를 발견하는 과정을 진행시키게 된다.If the WCDMA signal is not found within the predetermined time, the process proceeds to the discovery of the CDMA signal by switching to the CDMA method.
또한, 초기 설정이 CDMA인 경우 또는 초기 설정된 WCDMA에서 WCDMA 신호가 발견되지 않은 경우 CDMA 망을 탐색하면서 탐색 신호의 전계 강도를 측정하여 CDMA 신호가 발견되는지 확인한다.In addition, when the initial setting is CDMA or when no WCDMA signal is found in the initially set WCDMA, the CDMA network is searched to determine whether the CDMA signal is found by measuring the electric field strength of the search signal.
만일, 상기에서 CDMA 신호가 발견되지 않은 경우 타이머를 구동하면서 소정 시간 내에 CDMA 신호가 발견되는지 확인하고 소정 시간 내에 CDMA 신호가 발견되면 다시 CDMA 망에서 CDMA 신호를 발견하는 동작을 수행한다.If the CDMA signal is not found in the above, the CDMA signal is detected within a predetermined time while driving the timer. When the CDMA signal is found within the predetermined time, the CDMA signal is again found in the CDMA network.
따라서, 상기 과정으로 CDMA 신호가 발견된 경우 CDMA 망의 접속 상태를 유지하면서 주기적으로 WCDMA 망으로의 이동 명령을 검색하게 된다.Therefore, when a CDMA signal is found in the above process, the mobile station periodically searches for a move command to the WCDMA network while maintaining the connection state of the CDMA network.
만일, CDMA 망 접속 상태에서 WCDMA 망으로의 이동 명령이 검색되면 WCDMA 망을 탐색하면서 상기에 기재된 WCDMA 신호를 발견하기 위한 과정을 수행한다.If a move command to the WCDMA network is detected in the CDMA network access state, a process for discovering the WCDMA signal described above is performed while searching for the WCDMA network.
상기에서 상세히 설명한 바와 같이 본 발명은 CDMA와 WCDMA 통신 방식을 모두 탑재한 DBDM 단말기에서 CDMA와 WCDMA 간의 핸드오버(handover)를 가능하도록 함으로써 성능을 향상시킴은 물론 사용자에게 편리함을 제공할 수 있는 효과가 있다.As described in detail above, the present invention enables the handover between CDMA and WCDMA in a DBDM terminal equipped with both CDMA and WCDMA communication schemes, thereby improving performance and providing convenience to a user. have.
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| KR100677341B1 (en) * | 2004-07-29 | 2007-02-02 | 엘지전자 주식회사 | Hard handover method between wcdma and cdma |
| KR100732060B1 (en) * | 2005-12-27 | 2007-06-27 | 엘지전자 주식회사 | Mobile station with multiple action mode and it's method |
| KR100786657B1 (en) * | 2006-05-04 | 2007-12-21 | 에스케이 텔레콤주식회사 | Method and System for Changing Transmission Condition for Pilot Strength Measurement Message by Using In-Traffic System Parameter Message |
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| KR100594436B1 (en) * | 2004-11-15 | 2006-07-03 | 엘지전자 주식회사 | A mode connection method of the dual band dual mode mobile communication terminal |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2282730B (en) * | 1993-10-08 | 1998-01-28 | Nokia Telecommunications Oy | Dual mode subscriber terminal and a handover procedure of the dual mode subscriber terminal in a mobile telecommunication network |
| US5978679A (en) * | 1996-02-23 | 1999-11-02 | Qualcomm Inc. | Coexisting GSM and CDMA wireless telecommunications networks |
| SE9701617L (en) * | 1997-04-29 | 1998-10-30 | Ericsson Telefon Ab L M | Method and apparatus of a radio communication network |
| US7054290B1 (en) * | 2000-03-07 | 2006-05-30 | Telefonaktiebolaget Lm Ericsson (Publ) | Methods and apparatus for dual mode operation in a wireless communication system |
| US6768908B1 (en) * | 2000-04-07 | 2004-07-27 | Motorola, Inc. | Method and apparatus for soft handoff communications in a communication system operating according to IS-95B and IS-95C standards |
| KR100548899B1 (en) * | 2001-05-11 | 2006-02-02 | 교세라 가부시키가이샤 | Portable communication terminal and wireless communication system therefor |
-
2002
- 2002-12-31 KR KR1020020088349A patent/KR20040062037A/en active Search and Examination
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2003
- 2003-05-23 CN CNB031365469A patent/CN100433865C/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100677341B1 (en) * | 2004-07-29 | 2007-02-02 | 엘지전자 주식회사 | Hard handover method between wcdma and cdma |
| KR100732060B1 (en) * | 2005-12-27 | 2007-06-27 | 엘지전자 주식회사 | Mobile station with multiple action mode and it's method |
| KR100786657B1 (en) * | 2006-05-04 | 2007-12-21 | 에스케이 텔레콤주식회사 | Method and System for Changing Transmission Condition for Pilot Strength Measurement Message by Using In-Traffic System Parameter Message |
Also Published As
| Publication number | Publication date |
|---|---|
| CN100433865C (en) | 2008-11-12 |
| CN1514664A (en) | 2004-07-21 |
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