KR20000001975A - Finger allotment of mobile communication system - Google Patents

Finger allotment of mobile communication system Download PDF

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Publication number
KR20000001975A
KR20000001975A KR1019980022496A KR19980022496A KR20000001975A KR 20000001975 A KR20000001975 A KR 20000001975A KR 1019980022496 A KR1019980022496 A KR 1019980022496A KR 19980022496 A KR19980022496 A KR 19980022496A KR 20000001975 A KR20000001975 A KR 20000001975A
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South Korea
Prior art keywords
finger
path
energy
communication system
mobile communication
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KR1019980022496A
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Korean (ko)
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박태훈
박봉왕
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김영환
현대전자산업 주식회사
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Priority to KR1019980022496A priority Critical patent/KR20000001975A/en
Publication of KR20000001975A publication Critical patent/KR20000001975A/en

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/69—Spread spectrum techniques
    • H04B1/707—Spread spectrum techniques using direct sequence modulation
    • H04B1/7097—Interference-related aspects
    • H04B1/711—Interference-related aspects the interference being multi-path interference
    • H04B1/7115—Constructive combining of multi-path signals, i.e. RAKE receivers
    • H04B1/7117—Selection, re-selection, allocation or re-allocation of paths to fingers, e.g. timing offset control of allocated fingers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0602—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using antenna switching
    • H04B7/0608—Antenna selection according to transmission parameters
    • H04B7/061—Antenna selection according to transmission parameters using feedback from receiving side

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

Abstract

PURPOSE: A finger allotting method of a mobile communication system is provided to maximize the Path Diversity effect when a reverse traffic frame transmitted by a mobile station of the CDMA mobile communication system is received and to vary the reverse traffic frame. CONSTITUTION: A finger dividing method of a mobile communication system comprises: a first step to store the energy according to each path when a signal is below the searching of number N after searching the multi-path signal in the beginning, to confirm the finger lock state and to record the lock state; a second step to average the energy of each path when searching number N by the path; a third step to judge if the finger is lock on not when the amount of the selected paths is over 0; and a fourth step to distribute new path.

Description

이동통신 시스템의 핑거 할당방법Finger assignment method in mobile communication system

본 발명은 CDMA 시스템에 관한 것으로, 특히 CDMA이동통신 시스템에서 이동국이 송신한 리버스 트래픽 프레임을 수신하여 변조할 때 패스 다이버서티(Path Diversity)효과를 극대화시킬 수 있도록 한 이동통신 시스템의 핑거 할당방법에 관한 것이다.BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a CDMA system, and more particularly, to a finger allocation method of a mobile communication system that can maximize a path diversity effect when receiving and modulating a reverse traffic frame transmitted by a mobile station in a CDMA mobile communication system. It is about.

일반적으로 CDMA이동통신 시스템에서 리버스 트래픽 채널을 복조할 때 패스 다이버서티 효과를 위해 복조 요소인 핑거(Finger)가 4개 존재한다.In general, when demodulating a reverse traffic channel in a CDMA mobile communication system, four fingers, which are demodulation elements, exist for a pass diversity effect.

이 핑거에 멀티패스 신호를 할당하고 결합하여 복조함으로써 패스 다이버서티 효과를 통해 보다 나은 수신 성능을 얻도록 하고 있다.Multipath signals are assigned to these fingers, combined, and demodulated to achieve better reception performance through the pass diversity effect.

종래에는 한 번의 서칭(Searching)을 통해 검증되지 않은 멀티패스 신호를 할당함으로써 패스 다이버서티 효과를 얻지 못할 뿐만 아니라 빈번한 핑거할당으로 핑거가 제대로 동작하지 못하는 문제가 있었다.Conventionally, by assigning a multipath signal that has not been verified through one search, not only does not have a pass diversity effect but also a finger does not operate properly due to frequent finger assignment.

본 발명은 이와같은 종래의 문제점을 해결하기 위하여 안출한 것으로,본 발명의 목적은, 아웃 오브 록(Out Of Lock)상태인 핑거는 모두 새로운 패스를 할당하고 록인 핑거에 새로운 패스를 다시 할당시에는 록 검출회로가 10msec마다 동작하는 것을 고려해 M번이상 록인 경우에만 새로운 패스를 할당함으로써 빈번한 핑거할당을 통한 핑거의 오동작을 방지할 수 있도록 하는 이동통신 시스템의 핑거 할당방법을 제공하는데 있다.The present invention has been made to solve such a conventional problem, an object of the present invention, all of the fingers in the Out Of Lock (Out Of Lock) state when allocating a new path and the new pass to the lock-in finger Considering that the lock detection circuit operates every 10msec, the present invention provides a finger assignment method of a mobile communication system that can prevent a malfunction of a finger through frequent finger assignment by allocating a new pass only in case of M locks or more.

도 1은 본 발명 이동통신 시스템의 핑거 할당방법을 수행하기 위한 블록도1 is a block diagram for performing a finger assignment method of a mobile communication system of the present invention.

도 2는 본 발명 이동통신 시스템의 핑거 할당방법의 동작흐름도2 is a flowchart illustrating a finger assignment method of the present invention.

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

10:서처 엔진 20:핑거부10: search engine 20: finger rejection

30:복조부 40:PN시켄스 발생부30: demodulation part 40: PN sequence generating part

50:디인터리버 및 디코더50: Deinterleaver and Decoder

이와같은 목적을 달성하기 위한 본 발명은 초기에 멀티 패스 신호를 서칭 후 각 패스에 따른 에너지를 저장하고 핑거 록 상태를 확인하여 록 상태를 기록하는 단계, N번의 서칭시 각 패스들이 가지는 에너지를 패스별로 평균하고 그 값이 임계값 이상인 신호들만 핑거할당의 고려대상으로 설정하는 단계,선택된 패스의 개수가 0보다 클 때 핑거가 록인가를 판단하는 단계, 핑거가 아웃 오브 록 상태이면 서칭결과에 따른 멀티패스를 핑거에 할당하고, 핑거가 록 상태이면 서칭한 패스의 에너지가 핑거에 할당된 패스의 에너지보다 커도 록 상태를 통해 M번 이상 록이 되어 있는 핑거의 경우에만 할당하는 단계로 이루어짐을 특징으로 한다.In order to achieve the above object, the present invention initially stores the energy according to each pass after searching a multi-pass signal and checks the finger lock state to record the lock state, and passes the energy of each pass during N searches. Setting only those signals that are averaged by the average value and whose value is greater than or equal to a threshold value, determining whether the finger is locked when the number of selected passes is greater than zero, and if the finger is out of lock, Allocate a multipath to a finger, and if the finger is in the locked state, assign only the finger that is locked more than M times through the state that the energy of the searched path is greater than the energy of the path assigned to the finger. It is done.

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

도 1은 본 발명의 CSM(Cell Site Modem)ASIC 리시브 채널 블록도이다.1 is a block diagram of a CSM (Cell Site Modem) ASIC receive channel of the present invention.

도시된 바와같이 A,B안테나를 통하여 수신된 신호를 코리레이션(Correlation),디스프리딩(Despreading),왈시 칩 어큐무레이션(Walsh Chip Accumulation)하는 서처 엔진(10)과, 상기 A,B안테나를 통하여 입력되는 할당된 패스(Path)에 대한 신호를 코리레이션,디스프리딩,왈시 칩 어큐무레이션하는 핑거0,핑거1,핑거2,핑거3으로 된 핑거부(20)와,상기 서처 엔진(10)과 핑거부(20)의 출력신호를 합성하여 복조하는 복조부(30)와,상기 복조부(30)에 PN시켄스를 발생시키는 PN시켄스 발생부(40)와, 상기 복조부(30)로부터 신호를 입력받아 이를 디인터리빙시킨 후 비터비(Viterbi) 디코딩시키는 디인터리버 및 디코더(50)로 구성된다.As shown, a search engine 10 for correlating, despreading, and Walsh chip accumulating signals received through the A and B antennas, and the A and B antennas. The finger unit 20 comprises fingers 0, finger 1, finger 2, and finger 3 that correlate, despread, and Walsh chip accumulate a signal for an allocated path inputted through the search engine. A demodulator 30 for synthesizing and demodulating the output signals of the 10 and the finger 20, a PN sequence generator 40 for generating a PN sequence in the demodulator 30, and the demodulator 30 It is composed of a deinterleaver and a decoder 50 for receiving a signal from the deinterleaving it and Viterbi decoding.

이와같이 구성된 본 발명은 먼저 도 1에서 살펴보면, A,B 안테나를 통하여 수신된 신호를 서처 엔진(10)에서 코리레이션,디스프리딩,왈시 칩 어큐무레이션한 후 적절한 패스를 핑거부(20)에 할당하게 되면 핑거도 서처 엔진(10)과 마찬가지로 할당된 패스에 대한 신호를 코리레이션/디스프리딩/왈시 칩 어큐무레이션한 후 복조부(30)에서 각 핑거의 신호를 결합하여 디인터리버 및 디코더(50)로 보내면 디인터리버에서 디인터리빙 후 비터비 디코딩된다.In the present invention configured as described above, as shown in FIG. 1, the signal received through the A and B antennas is correlated, despreaded, and Walsh chip accumulated in the searcher engine 10, and then an appropriate path is applied to the finger unit 20. When assigned, the fingers, like the search engine 10, correlate, despread, and Walsh chip signals for the assigned path, and then combine the signals of each finger in the demodulator 30 to deinterleaver and decoder. If sent to 50, the deinterleaver decodes Viterbi after deinterleaving.

도 2는 본 발명의 동작 흐름도를 나타낸 것으로, 초기에 멀티 패스 신호를 서칭 후(S1), 멀티 패스 서치가 N번인가를 판단하여 N번이 아닐 경우 각 패스에 따른 에너지를 저장하고 핑거 록 상태를 확인하여 록 히스토리를 기록한다(S2,S3).FIG. 2 is a flowchart illustrating an operation of the present invention. After initially searching a multipath signal (S1), it is determined whether the multipath search is N times. Check and record the lock history (S2, S3).

상기 S2단계에서 N번의 서칭일 경우, 각 패스들이 가지는 에너지를 패스별로 평균하고 그 값이 임계값 이상인 신호들만 핑거할당의 고려대상으로 선택하며, 이때 선택된 패스의 개수를 X라 한다(S4).In the case of N search in the step S2, the energy of each pass is averaged for each pass, and only signals having a value greater than or equal to a threshold value are selected for finger assignment, and the number of selected passes is X (S4).

그리고 선택된 패스의 개수 X가, 0보다 큰가를 판단하여 O보다 작으면 종료하고 0보다 클 때 다시 핑거가 록인가를 판단한다(S5,S6).It is determined whether the number X of the selected paths is greater than zero, and if it is less than 0, it is terminated.

즉, 고려대상인 멀티패스중에 현재 록된 핑거의 패스와 동일한 것은 제외함으로써 같은 패스가 2개 이상인 핑거에 동시에 할당되는 것을 방지한다.That is, the same path is prevented from being simultaneously assigned to two or more fingers by excluding the same as the path of the finger currently locked among the multipaths under consideration.

상기 S6단계에서 핑거가 록이 아닌, 아웃 오브 록 상태이면 현재 할당된 패스는 더 이상 존재하지 않으므로 서칭결과에 따른 멀티패스를 핑거에 할당한다(S8).If the finger is in the out-of-lock state instead of the lock in step S6, since the currently assigned path no longer exists, the multipath according to the search result is allocated to the finger (S8).

그러나 상기 S6단계에서 록 된 핑거의 경우는 서칭한 패스의 에너지가 핑거에 할당된 패스의 에너지보다 크다 하더라도 록 상태를 통해 M번 이상 록이 되어 있는 핑거의 경우(S7)에만 핑거를 할당(S8)함으로써 그 핑거가 빈번히 할당되어 변조에 참여하지 못하므로 발생하는 패스 다이버서티 효과를 저해하는 요소를 제거한다.However, in the case of the finger locked in the step S6, even if the energy of the searched path is greater than the energy of the path assigned to the finger, the finger is allocated only in the case of the finger that is locked at least M times through the locked state (S7) (S8). This eliminates the elements that hinder pass diversity effects that occur because the finger is frequently assigned to participate in modulation.

이상에서 설명한 바와같은 본 발명은 CDMA이동통신 시스템에서 이동국이 송신한 리버스 트래픽 프레임을 수신하여 복조할 때 핑거가 아웃 오브 록 상태이면 서칭결과에 따른 멀티패스를 핑거에 할당하고 핑거가 록 상태이면 서칭한 패스의 에너지가 핑거에 할당된 패스의 에너지보다 클지라도 록 상태를 통해 M번 이상 록이 되어 있는 핑거의 경우에만 할당함으로써 CDMA 셀룰러시스템의 기지국부의 채널카드 스위치에서 단말기 신호를 최적으로 찾아 데이터를 복조할 수 있어 패스 다이버서티를 극대화할 수 있는 효과가 있다.As described above, in the CDMA mobile communication system, when a reverse traffic frame transmitted by a mobile station is received and demodulated, the present invention assigns a multipath to a finger according to a search result when the finger is out of lock and searches if the finger is in the locked state. Even though the energy of one pass is greater than the energy of the pass assigned to the finger, it is allocated only to the finger that is locked more than M times through the lock state, so that the channel card switch of the base station of the CDMA cellular system can find the terminal signal optimally. Demodulation has the effect of maximizing pass diversity.

Claims (1)

A,B안테나를 통하여 수신된 신호를 코리레이션,디스프리딩,왈시 칩 어큐무레이션하는 서처 엔진, 상기 A,B안테나를 통하여 입력되는 할당된 패스에 대한 신호를 코리레이션,디스프리딩,왈시 칩 어큐무레이션하는 핑거부,상기 서처 엔진과 핑거부의 출력신호를 합성하여 복조하는 복조부,상기 복조부에 PN시켄스를 발생시키는 PN시켄스 발생부, 상기 복조부로부터 신호를 입력받아 이를 디인터리빙시킨 후 비터비 디코딩시키는 디인터리버 및 디코더로 구성된 CSM ASIC내의 리시브 채널을 갖는 이동통신시스템에 있어서,A search engine for correlating, despreading, and Walsh chip signals received through A and B antennas, and correlating, despreading, and Walsh signals for an assigned path input through the A and B antennas. A chip accumulating finger unit, a demodulator for synthesizing the output signal of the searcher engine and the finger unit, a PN sequence generator for generating a PN sequence to the demodulator, a signal input from the demodulator to deinterleave the signal; A mobile communication system having a receive channel in a CSM ASIC composed of a deinterleaver and a decoder for post Viterbi decoding, 초기에 멀티 패스 신호를 서칭 후 N번의 서칭이하일 때 각 패스에 따른 에너지를 저장하고 핑거 록 상태를 확인하여 록 상태를 기록하는 제1단계;A first step of storing energy according to each pass and checking the finger lock state and recording the locked state when N search times or less after initially searching the multi-pass signal; N번의 서칭일 때 각 패스들이 가지는 에너지를 패스별로 평균하고 그 값이 임계값 이상인 신호들만 핑거할당의 고려대상으로 선택하는 제2단계;A second step of averaging the energy of each pass for each N search and selecting only signals whose value is greater than or equal to a threshold value for consideration of finger assignment; 선택된 패스의 개수가 0보다 클 때 핑거가 록인가를 판단하는 제3단계;Determining whether the finger is locked when the number of selected passes is greater than zero; 핑거가 아웃 오브 록 상태이면 서칭결과에 따른 새로운 패스를 핑거에 할당하고, 핑거가 록 상태이면 서칭한 패스의 에너지가 핑거에 할당된 패스의 에너지보다 커도 록 상태를 통해 M번 이상 록이 되어 있는 핑거의 경우에만 새로운 패스를 할당하는 제4단계로 이루어짐을 특징으로 하는 이동통신 시스템의 핑거 할당방법.If the finger is in the out of lock state, a new path is assigned to the finger according to the search result. If the finger is in the locked state, the searched path is locked more than M times through the state that the energy of the searched path is greater than the energy of the path assigned to the finger. And a fourth step of allocating a new path only in the case of a finger.
KR1019980022496A 1998-06-16 1998-06-16 Finger allotment of mobile communication system KR20000001975A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100754634B1 (en) * 2001-05-09 2007-09-05 삼성전자주식회사 Method for assigning finger to share with supplemental channel in mobile communication terminal using slim finger

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100754634B1 (en) * 2001-05-09 2007-09-05 삼성전자주식회사 Method for assigning finger to share with supplemental channel in mobile communication terminal using slim finger

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