KR20010038975A - Traffic frame selecting method of mobile communication system - Google Patents

Traffic frame selecting method of mobile communication system Download PDF

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Publication number
KR20010038975A
KR20010038975A KR1019990047177A KR19990047177A KR20010038975A KR 20010038975 A KR20010038975 A KR 20010038975A KR 1019990047177 A KR1019990047177 A KR 1019990047177A KR 19990047177 A KR19990047177 A KR 19990047177A KR 20010038975 A KR20010038975 A KR 20010038975A
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South Korea
Prior art keywords
base station
traffic frame
traffic
station controller
interrupt
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KR1019990047177A
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Korean (ko)
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송태걸
어준선
전민길
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박종섭
현대전자산업 주식회사
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Priority to KR1019990047177A priority Critical patent/KR20010038975A/en
Publication of KR20010038975A publication Critical patent/KR20010038975A/en

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W24/00—Supervisory, monitoring or testing arrangements
    • H04W24/02—Arrangements for optimising operational condition
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/16—Performing reselection for specific purposes
    • H04W36/18—Performing reselection for specific purposes for allowing seamless reselection, e.g. soft reselection
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/12—Wireless traffic scheduling
    • 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
    • H04W88/12—Access point controller devices

Abstract

PURPOSE: A method for selecting the optimum traffic frame in a mobile communication system is provided to select the optimum traffic frame among many traffic frames received from various base stations and to dynamically adjust an Rx interrupt generation point according to transmission delay between a base station and a base station controller, without referring to a traffic frame sequence. CONSTITUTION: A base station controller executes call setup or new base station activation(S1) and measures transmission delay between a base station and the base station controller(S2). The base station controller sets up an RIO(Rx Interrupt Offset) dependent on transmission delay(S3) and judges whether an Rx interrupt is generated(S4). If the Rx interrupt is generated, the base station controller selects a traffic frame(S5). In case that the Rx interrupt is not generated, the base station controller judges whether a traffic frame is received(S6). If a traffic frame is received, the base station controller stores the traffic frame(S7).

Description

이동 통신 시스템의 최적 트래픽 프레임 선택 방법 {Traffic frame selecting method of mobile communication system}{Traffic frame selecting method of mobile communication system}

본 발명은 이동통신 시스템에 관한 것으로, 특히 소프트 핸드 오프를 지원하는 이동 통신 시스템에서 핸드 오프 중 수신된 여러 트래픽 프레임 중 최적의 프레임을 선택하여 Rx 인터럽트를 다이나믹하게 조절함으로써 기지국과 제어국간 전송 딜레이와 무관하게 처리할 수 있도록 한 이동 통신 시스템의 최적 트래픽 프레임 선택 방법에 관한 것이다.The present invention relates to a mobile communication system. In particular, in a mobile communication system supporting soft handoff, a transmission delay between a base station and a control station is selected by dynamically adjusting an Rx interrupt by selecting an optimal frame among various traffic frames received during handoff. The present invention relates to a method for selecting an optimal traffic frame of a mobile communication system so that it can be processed independently.

일반적으로 상용 서비스중인 CDMA시스템은 단말기의 이동중에도 지속적인 서비스가 가능하도록 소프트 핸드 오프를 지원한다.In general, commercially available CDMA systems support soft handoff to enable continuous service while the terminal is in motion.

즉, 이동 단말기는 동시에 여러 기지국과 데이터를 송수신 할 수 있으며 기지국을 제어하는 제어국은 동시에 여러 기지국을 통하여 이동 단말기와 송수신할 수 있어야 한다.That is, the mobile terminal can transmit and receive data to and from several base stations at the same time, and the control station controlling the base station must be able to transmit and receive to and from the mobile terminal through several base stations at the same time.

또한, 통화중 트래픽의 송수신 간격은 20msec로서 제어국은 20ms마다 해당 기지국과 송수신을 하며 기지국은 기준 20msec에 단말기와 송수신을 한다.In addition, the transmission and reception interval of the traffic during the call is 20msec, the control station transmits and receives with the base station every 20ms, and the base station transmits and receives with the terminal at the reference 20msec.

소프트 핸드 오프로 인하여 제어국은 20msec마다 여러 기지국과 동시에 동일한 트래픽 프레임을 송수신하게 되는데 여기서, 여러 기지국으로부터 수신된 트래픽 프레임중 가장 좋은 품질의 트래픽 프레임을 선택할 수 있어야 한다.Due to the soft handoff, the control station transmits and receives the same traffic frame simultaneously with several base stations every 20 msec. Here, the control station should be able to select the best quality traffic frame among the traffic frames received from the various base stations.

종래에는 기지국이 제어국으로 송신하는 트래픽 프레임에 CDMA동기 타임에서 얻어진 프레임 시퀀스가 존재한다.Conventionally, there is a frame sequence obtained at CDMA synchronous time in a traffic frame transmitted by a base station to a control station.

즉, 동일한 20msec 기준 시각에 단말기로부터 수신한 트래픽 프레임은 동일한 프레임 시퀀스를 갖게 된다.That is, the traffic frames received from the terminal at the same 20msec reference time have the same frame sequence.

종래 선택 알고리즘은 트래픽 시퀀스를 이용한 방법으로서 여러 기지국으로부터 수신한 트래픽 프레임의 시퀀스를 참조하여 동일 20msec기준 시각에 수신한 동일 프레임인가를 판단한다.The conventional selection algorithm is a method using a traffic sequence and refers to a sequence of traffic frames received from several base stations to determine whether the same frame is received at the same 20 msec reference time.

즉, 프레임 시퀀스가 동일한 프레임까지 비교하여 품질이 가장 좋은 프레임을 선택한다.That is, the frame having the highest quality is selected by comparing the frame sequence with the same frame.

그러나 이와같은 종래 프레임 선택 방법에 있어서는 첫째, 기지국과 제어국간 전송 딜레이가 허용치 이상일 경우 대처방안이 없었다.However, in the conventional frame selection method, first, there is no countermeasure when the transmission delay between the base station and the control station is greater than the allowable value.

즉, 어느 한 기지국만 전송 딜레이가 허용치 이상일 경우, 프레임 시퀀스는 인접 기지국과 동일하지 않게 된다.That is, if only one base station has a transmission delay greater than or equal to the allowable value, the frame sequence is not the same as the neighboring base station.

둘째, 프레임 시퀀스가 어긋났을 경우 대처 방안에 한계가 있다.Second, there is a limit to the countermeasures when the frame sequence is out of order.

즉, 프레임 시퀀스는 무한점으로 증가할 수 없고, 순환하는 값이기 때문에 비정상 경우 보완에 한계가 있었다.In other words, the frame sequence cannot be increased to infinity and is a cyclic value, and thus, there is a limit to supplementation in an abnormal case.

본 발명은 이와 같은 종래의 문제점을 해결하기 위하여 안출한 것으로, 본 발명의 목적은, 소프트 핸드 오프를 지원하는 이동통신 시스템에 있어서, 핸드 오프중 수신된 여러 트래픽 프레임중 최적의 프레임을 선택하기 위한 것으로, 트래픽 프레임의 시퀀스를 참조하지 않고 기지국과 제어국간 전송 딜레이에 따라 다이나믹하게 Rx인터럽트 발생시점을 조절하도록 하는 이동 통신 시스템의 최적 트래픽 프레임 선택 방법을 제공하는데 있다.The present invention has been made to solve such a conventional problem, and an object of the present invention is to select an optimal frame among several traffic frames received during handoff in a mobile communication system supporting soft handoff. An object of the present invention is to provide an optimal traffic frame selection method of a mobile communication system that dynamically adjusts an Rx interrupt occurrence time according to a transmission delay between a base station and a control station without referring to a sequence of traffic frames.

도 1은 본 발명의 CDMA시스템의 블록도1 is a block diagram of a CDMA system of the present invention.

도 2는 본 발명에 따른 동작 흐름도2 is a flowchart of operation according to the present invention.

도 3은 본 발명에 따른 제어국 20ms 수신 타이밍도.3 is a control station 20ms reception timing diagram in accordance with the present invention.

〈도면의 주요 부분에 대한 부호의 설명〉<Explanation of symbols for main parts of drawing>

1:단말기 2:기지국1: terminal 2: base station

3:제어국 4:교환국3: control station 4: switching station

이와 같은 목적을 달성하기 위한 본 발명은, 호 설정 초기에 기지국과 제어국간 주고 받는 최초 메시지를 이용하여 기지국 제어국간 전송 딜레이를 구하고 이 값에 따라 제어국은 선택 시점을 결정하여 20msec마다 정해진 시각에 Rx인터럽트를 발생시켜 제어국에서 여러 기지국으로부터 수신한 프레임 중 가장 좋은 품질의 프레임을 선택하도록 함을 특징으로 한다.In order to achieve the above object, the present invention obtains a transmission delay between base station control stations using an initial message exchanged between a base station and a control station at the beginning of call setup, and according to this value, the control station determines a selection time point at a predetermined time every 20 msec. The Rx interrupt is generated so that the control station selects a frame having the best quality among frames received from several base stations.

이하, 본 발명의 실시 예를 첨부된 도면을 참고로 하여 상세히 설명하면 다음과 같다.Hereinafter, an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

도 1은 본 발명이 적용되는 분야의 하드웨어적인 구성을 나타낸 블록도로, 각 휴대용 단말기(1)와, 상기 단말기(1)와 무선으로 연결되는 기지국(2)과, 상기 기지국(2)을 제어하기 위한 제어국(3)과, 상기 제어국(3)과 유선으로 연결되는 교환국(4)으로 구성된다.1 is a block diagram showing a hardware configuration of the field to which the present invention is applied, and controls each portable terminal 1, a base station 2 wirelessly connected to the terminal 1, and the base station 2. Control station 3, and an exchange station 4 connected by wire to the control station 3.

이와 같이 구성된 본 발명의 작용효과를 도 2와 도 3을 참고로 하여 상세히 설명하면 다음과 같다.When described in detail with reference to Figures 2 and 3 the effect of the present invention configured as described above.

먼저, 호 설정 또는 새로운 기지국 활성화를 수행하고(S1단계), 기지국(2)과 제어국(3)간 전송 딜레이를 측정한다(S2단계).First, call setup or new base station activation is performed (step S1), and a transmission delay between the base station 2 and the control station 3 is measured (step S2).

그리고 전송 딜레이에 따른 RIO(Rx Interrupt Offset)를 설정하고(S3단계), Rx인터럽트가 발생하였는가를 판단하여(S4단계) Rx인터럽트가 발생하였으면 트래픽 프레임을 선택한다(S5단계).Then, RIO (Rx Interrupt Offset) is set according to the transmission delay (step S3), and it is determined whether an Rx interrupt occurs (step S4). If an Rx interrupt occurs, a traffic frame is selected (step S5).

그러나 상기 S4단계에서 Rx트래픽이 발생하지 않았으면 이번에는 트래픽 프레임이 수신되었는가를 판단하여 트래픽 프레임이 수신되었으면 트래픽 프레임을 저장한다(S6,S7단계).However, if the Rx traffic has not occurred in step S4, it is determined whether the traffic frame has been received at this time, and if the traffic frame is received, the traffic frame is stored (steps S6 and S7).

상기 S6단계에서 트래픽 프레임이 수신되지 않았으면 상기 S4단계로 가서 Rx인터럽트 발생여부를 판단한다.If the traffic frame is not received in step S6, go to step S4 to determine whether an Rx interrupt occurs.

도 3은 제어국(3)의 20ms수신 타이밍도로, 초기 호 설정 또는 핸드 오프로 인하여 새로운 기지국(2)이 활성화되면 도 3의 (B)와 (C)에 도시된 바와 같이 기지국(2)과 제어국(3)간 전송 딜레이(D1,D2)를 구하고 이를 바탕으로 도 3의 (D)와 같이 Rx인터럽트 오프셋 값(RIO)을 설정하는데, 이는 전송 딜레이(D1,D2)를 모두 포함하는 값으로 기지국(2)으로부터 트래픽 프레임이 모두 도착한 이후의 시간이 되어야 한다.FIG. 3 is a 20 ms reception timing diagram of the control station 3. When the new base station 2 is activated due to an initial call setup or handoff, as shown in FIGS. 3B and 3C, FIG. The transmission delay (D1, D2) between the control stations (3) is obtained and based on this, the Rx interrupt offset value (RIO) is set as shown in (D) of FIG. 3, which is a value including all of the transmission delays (D1, D2). This should be the time after all traffic frames arrive from the base station 2.

여기서, 상기 (B)(C)의 D1은 기지국(2)의 트래픽 프레임 수신 시각(BTS1)에서의 전송 딜레이, D2는 기지국(2)의 트래픽 프레임 수신 시각(BTS2)에서의 전송 딜레이이다.Here, D1 in (B) and (C) is a transmission delay at the traffic frame reception time BTS1 of the base station 2, and D2 is a transmission delay at the traffic frame reception time BTS2 of the base station 2.

트래픽 프레임이 도착되면 선택 버퍼에 트래픽 프레임을 저장하고 Rx인터럽트 발생시 비로소 최적의 트래픽 프레임을 선택하여 트래픽 프레임 처리 루틴으로 프레임을 전달한다.When a traffic frame arrives, the traffic frame is stored in a selection buffer, and when an Rx interrupt occurs, an optimal traffic frame is selected and passed to the traffic frame processing routine.

이상에서 설명한 바와 같은 본 발명은 최적의 통화 품질을 유지하기 위하여 소프트 핸드 오프를 지원하는 이동통신 시스템에 있어서, 제어국에서 수행하는 트래픽 프레임 선택 방법을 제공함으로써 기지국과 제어국간 전송 릴레이에 관계없이 최적의 통화 품질을 유지할 수 있는 효과가 있다.As described above, the present invention provides a method of selecting a traffic frame performed by a control station in a mobile communication system supporting soft handoff in order to maintain an optimal call quality, regardless of a transmission relay between a base station and a control station. Has the effect of maintaining the call quality.

Claims (1)

호 설정 초기에 기지국과 제어국간 주고 받는 최초 메시지를 이용하여 기지국과 제어국간 전송 딜레이를 측정하는 제1단계,A first step of measuring a transmission delay between the base station and the control station by using an initial message exchanged between the base station and the control station at the beginning of call setup; 상기 제1단계에서 측정한 전송 딜레이 값에 따라 제어국에서 RIO를 설정하는 제2단계,A second step of setting RIO at the control station according to the transmission delay value measured in the first step, 기지국으로부터 트래픽 프레임 수신시 제어국에서 선택버퍼에 트래픽 프레임을 저장하는 제3단계, 및A third step of storing the traffic frame in the selection buffer at the control station upon receiving the traffic frame from the base station, and Rx인터럽트가 발생하였을 경우, 제어국은 여러 기지국으로부터 수신한 프레임중 최적의 트래픽 프레임을 선택하는 제4단계로 이루어짐을 특징으로 하는 이동 통신 시스템의 최적 트래픽 프레임 선택 방법.If the Rx interrupt occurs, the control station comprises a fourth step of selecting the optimal traffic frame among the frames received from the various base stations, characterized in that the optimal traffic frame selection method of the mobile communication system.
KR1019990047177A 1999-10-28 1999-10-28 Traffic frame selecting method of mobile communication system KR20010038975A (en)

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KR20200022126A (en) 2018-08-22 2020-03-03 주식회사 도원엔바이로 Ceramic Bio Media Having Adsorption Of Nitrogen And Phosphorous And Manufacturing Method Of The Same

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KR100818841B1 (en) * 2001-12-20 2008-04-01 엘지노텔 주식회사 Method of quality improving of voice traffic data from various ports
KR20200022126A (en) 2018-08-22 2020-03-03 주식회사 도원엔바이로 Ceramic Bio Media Having Adsorption Of Nitrogen And Phosphorous And Manufacturing Method Of The Same

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