WO2004039017A1 - Recherche de canal de correction de frequence dans un systeme global de communications mobiles a partir d'un systeme d'acces multiple par code de repartition - Google Patents

Recherche de canal de correction de frequence dans un systeme global de communications mobiles a partir d'un systeme d'acces multiple par code de repartition Download PDF

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Publication number
WO2004039017A1
WO2004039017A1 PCT/KR2003/002265 KR0302265W WO2004039017A1 WO 2004039017 A1 WO2004039017 A1 WO 2004039017A1 KR 0302265 W KR0302265 W KR 0302265W WO 2004039017 A1 WO2004039017 A1 WO 2004039017A1
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WO
WIPO (PCT)
Prior art keywords
searching
frame
window
gsm
cdma
Prior art date
Application number
PCT/KR2003/002265
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English (en)
Inventor
Hyeon-Woo Lee
Guangzhao Tian
Xiaoqiang Li
Original Assignee
Samsung Electronics Co., Ltd.
Beijing Samsung Telecom R & D Center
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Samsung Electronics Co., Ltd., Beijing Samsung Telecom R & D Center filed Critical Samsung Electronics Co., Ltd.
Priority to AU2003272131A priority Critical patent/AU2003272131A1/en
Publication of WO2004039017A1 publication Critical patent/WO2004039017A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W48/00—Access restriction; Network selection; Access point selection
    • H04W48/08—Access restriction or access information delivery, e.g. discovery data delivery
    • H04W48/12—Access restriction or access information delivery, e.g. discovery data delivery using downlink control channel
    • 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

Definitions

  • This invention relates to the field of mobile communications, and especially relates to a method for searching GSM Frequency Correction Channel from CDMA system.
  • GSM Global System of Mobile Communication
  • CDMA Global System of Mobile Communication
  • MS When a Mobile Station (referred to as MS) receives a Candidate Frequency Searching Reference Message (abbreviated as CFSRM) from Base Station (referred to as BS), MS will search and measure BSs in adjacent cells once or periodically.
  • BSs in adjacent cells can be BS working at different frequency band in CDMA Mode, BS working in Analogue Mode, or BS working in GSM mode.
  • MS After receiving and processing above CFSR message, MS will obtain the required information of adjacent GSM cell BSs, including Absolute Radio Frequency Channel Number (referred to as ARFCN) of Broadcast Control Channel carrier frequency (referred to as BCCH carrier frequency), on which Forward Common Control Channel resides.
  • ARFCN Absolute Radio Frequency Channel Number
  • BCCH carrier frequency Broadcast Control Channel carrier frequency
  • the dual-mode MS stops receiving traffic data on Forward Traffic Channel from BS and also stops sending data on Reverse Traffic Channel. Then MS stops the operations in CDMA mode, and tunes the radio frequency module to target frequency and performs measurements on the cell. After finishing the measurement, the MS tunes the RF module back to original working frequency of CDMA, continues with the interrupted CDMA operation; and reports measurement results of adjacent cell to the upper layer as the reference data for following switching procedure
  • compensatory approach is defined in existing standard: that is, in reverse traffic channel, in which 20 milliseconds frame is used as an unit; if an interruption of d milliseconds is required for searching adjacent cells during a specified frame, the transmission power for the remaining part of the frame is boosted to compensate the losses of transmission power of that frame, to reduce the error rate of received data at the receiver side (the BS).
  • the value of boosted power is dependent on d. The larger d is, the larger the boosted power is.
  • GSM system has its own structure, so specifed strategy must be adopted for searching and measuring GSM cells. For the convenience of later description, it is necessary to introduce the structure of Forward Common Control Channel of GSM here.
  • the Forward Common Control Channel of GSM cell is transmitted continuously on a specified frequency point, which is called BCCH carrier frequency.
  • GSM Global System for Mobile communications
  • FCCH Frequency Correction Channel
  • SCH Synchronization Channel
  • Figure 3 shows the multi-frame structure of Forward Common Control Channel continuously transmitted on BCCH carrier frequency.
  • the length of a multi-frame is about 231 milliseconds, including 51 TDMA frames, each which is about 4.63 milliseconds long.
  • FCCH and SCH are transmitted 5 times in each multi-frame.
  • the interval between each is 10 or 11 TDMA frames, or 46.3 or 50.93 milliseconds.
  • RSSI Receiving Signal Strength Indication
  • BSIC BS Identification Code
  • the frequency correction information is contained in the first timeslot of FCCH.
  • the length of the timeslot is about 0.58 milliseconds, which is marked with red block in Figure 3; and BSIC is included in SCH. Both must be obtained through cell search.
  • any MS that tries to switch to the GSM cell must tune its RF module to the BCCH carrier frequency; searches for FCCH and SCH with certain searching scheme to obtain information mentioned above, and process it for inter-system switching in next step.
  • the object of this invention is to provide a method of searching tentatively GSM cell for GSM/CDMA dual-mode MS that works in CDMA mode.
  • a method for searching GSM Frequency Correction Channel (FCCH) from CDMA system comprising following steps:
  • the width d of Searching Window is the fixed, under average conditions, the number of Searching Windows needed is minimized, thereby results in minimal influence on the system performance.
  • the time needed is also minimal and the searching speed is the highest from the start point to the success of search.
  • the number of parameters needed to be set is minimal, which makes the MS design easier for MS manufacturers.
  • Figure 1 The method of combining Searching Windows in adjacent frames in the searching of GSM FCCH;
  • Figure 2 The inter-system searching method of interruption window and power compensation defined in CDMA standard
  • FIG. 1 The Multi- frame structure of GSM Forward Common Control Channel
  • Figure 4 Composition of the method by Tentatively Searching GSM FCCH;
  • Figure 5 The flowchart of GSM FCCH searching with Combined Searching Windows.
  • This invention is proposed in order to solve the problem of existing physical layer standard of CDMA not supporting FCCH searching of adjacent GSM cell. Although this invention contains a complete searching process, it is divided into two aspects for explanation for the convenience of description:
  • CDMA standard specifies that BS doesn't know the searching and measurement operations of MS. Thus, it is impossible for BS to provide correspondent information to MS, in which one of the most importance is the relevant timing relation between GSM multi-frame and CDMA traffic channel frames. The effect thus caused is that MS is "blind" when searching GSM FCCH, i.e. it doesn't know when GSM FCCH begins related to CDMA frames of the traffic channel.
  • the whole process adopts a method of tentative searching, i.e. opening a Searching Window without the prior knowledge of GSM FCCH relevant timing relationship (it is called as one Searching Attempt). If FCCH appears exactly at this time, MS can know the searching success through demodulating specific information in FCCH and the tentative searching of this time succeeds and the whole searching process is terminated at the same time; otherwise, this tentative searching fails and MS must close the Searching Window and return to work in CDMA mode.
  • MS After waiting for a specific period of time (the length is determined by the timing scheme), MS opens a Searching Window once again and repeats the tentative searching. Repeat the above processes till successful demodulation of FCCH.
  • Timing scheme The time relationship between multiple searching attempt is defined by specific timing scheme.
  • composition of such a timing scheme is shown in Figure 5, which includes several factors:
  • One or more Searching Windows because related to Searching Window, the time for appearance of FCCH is random and it can't be guaranteed to find FCCH at the first Searching Window, and multiple Searching Windows are needed in most cases; 2.
  • the starting time S of Searching Window indicates the time offset of Searching Window with respect to the CDMA traffic frame the window resides. The unit is millisecond;
  • Time interval TI is the time between two adjacent Searching Windows, whose unit is millisecond.
  • this invention Based on the tentative GSM FCCH searching, this invention gives a timing scheme that specifies the parameters for above searching process, which makes MS finish searching procedure quickly and cause minimal influence on system performance, whose structure is shown in Figure 1 :
  • Each frame has Searching Window
  • each frame during the period from the start of immediately following CDMA traffic frame, till the time that GSM FCCH is searched successful, will be interrupted for a time gap, which is used for GSM FCCH searching;
  • the width of Searching Window must be less than one half of the 20-millisecond CDMA traffic frame, i.e. d ⁇ 10 milliseconds.
  • simulation results show that when d ⁇ 1 millisecond, the searching time will be very long, which is actually impractical. So the range of d given in this invention is from 1 millisecond to 10 milliseconds. Within this range, this invention won't make further requirements on the value of Searching Window width d, because according to simulation results, the timing method given in this invention behaves optimal or quasi-optimal for different value of Searching Window widths. Considering the different requirements on d for different equipment manufacturers, no specific requirement is made.
  • the CDMA traffic frame that the first Searching Window locates in is the 1 st frame (odd frame), and the next frame is the 2 nd frame (even frame), and the next frame after that is the 3 rd frame (odd frame), and so on.
  • the offset of Searching Window from the starting time of the frame of is (20 - d) milliseconds, i.e. at the end of the frame.
  • the offset of Searching Window from the starting time of the frame of is 0 millisecond, i.e. at the head of the frame.
  • the setting the Searching Windows Interval TI between two adjacent frames is also determined by the frame being odd frame or even frame.
  • the Searching Windows Interval between the 1 st frame and the 2 nd frame is d milliseconds, and that between the 2 nd and the 3 rd is (40-d) milliseconds, and that between the 3 rd and the 4 th is d milliseconds, and so on.
  • the Searching Window in adjacent frames (the 1 st frame and the 2 nd frame, the 3 rd frame and the 4 th frame, and so on) is adjacent in time and can be used as a combination, which makes the searching process be performed in a new and larger Searching Window with a width of 2 times d millisecond, and can speed up the searching procedure and reduce the searching times.
  • Figure 5 describes the operation flow of tentative searching for FCCH channels of adjacent GSM cells by using timing scheme of Combined Searching Window for dual-mode MS working in CDMA mode:
  • each odd frame the transmission power on Reverse Traffic Channel will be boosted during the period from the start of the frame to (20-d) milliseconds. The remaining d milliseconds of the fame is the first part for a searching attempt.
  • Searching Window is opened, i.e. MS both stops sending data on Reverse Traffic Channel and stops receiving information from Forward Traffic Channel, and tunes the RF module to the BCCH carrier frequency of GSM cell, to start a searching attempt, which will keep on until the even frame immediately following it;
  • step 505 If the demodulation succeeds, it indicates that the searching attempt succeeds, and MS will directly go to step 505; otherwise, it indicates that the tentative searching fails and steps 502 and 503 are repeated as a new searching attempt. This process is performed repeatedly until the successful demodulation of frequency correction information.

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

Abstract

L'invention concerne un programme de synchronisation conçu pour la recherche de canal de correction de fréquence (FCCH) dans un système global de communications (GSM) à partir d'un système d'accès multiple par code de répartition (AMCR), qui consiste à établir une fenêtre de recherche dans chaque trame de trafic AMCR ; à rechercher un FCCH d'une cellule GSM adjacente par le biais de la fenêtre de recherche ; en cas de succès, terminer la recherche ; dans le cas contraire, redémarrer la recherche. Lorsque la largeur d de la fenêtre de recherche est fixe, dans les conditions moyennes, ledit programme de synchronisation réduit au minimum le nombre de fenêtres de recherche requises et influe le moins possible sur l'efficacité du système. Pour la même largeur de fenêtre de recherche d, dans les conditions moyennes, le temps nécessaire est minime et la vitesse de recherche est la plus élevée du point de départ jusqu'à la conclusion fructueuse de la recherche. En outre, le nombre de paramètres nécessaires à établir est minime, ce qui rend la mise en oeuvre de stations mobiles (MS) plus facile pour les fabricants de MS.
PCT/KR2003/002265 2002-10-24 2003-10-24 Recherche de canal de correction de frequence dans un systeme global de communications mobiles a partir d'un systeme d'acces multiple par code de repartition WO2004039017A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU2003272131A AU2003272131A1 (en) 2002-10-24 2003-10-24 SEARCHING GSM FCCHs FROM A CDMA SYSTEM

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CNA021480648A CN1492611A (zh) 2002-10-24 2002-10-24 从cdma2000系统中搜索gsm频率校正信道的定时方法
CN02148064.8 2002-10-24

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WO2004039017A1 true WO2004039017A1 (fr) 2004-05-06

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CN (1) CN1492611A (fr)
AU (1) AU2003272131A1 (fr)
WO (1) WO2004039017A1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101399563B (zh) * 2008-10-17 2012-07-04 华为终端有限公司 一种搜索全球移动通讯系统网络的方法、终端和通信系统
WO2015026467A1 (fr) * 2013-08-19 2015-02-26 Qualcomm Incorporated Procédé d'abandon de détection de salve fcch pour un mesurage inter-technologies d'accès radio (irat)
TWI510121B (zh) * 2011-11-08 2015-11-21 Mediatek Inc 無線通訊裝置以及通訊作業協調方法
DE102015203166B4 (de) 2014-03-05 2023-08-24 Apple Inc. Verbesserte Erfassung eines Synchronisierungsbeacons

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101437275B (zh) * 2007-11-13 2010-11-03 联芯科技有限公司 通信终端读取邻区广播控制信道信息的方法和装置
US8619709B2 (en) * 2007-12-18 2013-12-31 Nippon Telegraph And Telephone Corporation Access point scan method, storage medium storing scan program, and station
CN102056272B (zh) * 2009-11-11 2013-09-11 中兴通讯股份有限公司 频率搜索方法及装置
EP2717634B1 (fr) * 2012-10-05 2018-01-10 Telefonaktiebolaget LM Ericsson (publ) Correction de fréquence et de détection de limite d'intervalle de temps
CN105813173B (zh) * 2014-12-31 2020-02-11 展讯通信（上海）有限公司 多卡多待移动终端的gsm小区搜索方法及装置

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1999038270A2 (fr) * 1998-01-22 1999-07-29 British Telecommunications Public Limited Company Reception de signaux a etalement du spectre a interference a bande etroite
FR2822613A1 (fr) * 2001-03-20 2002-09-27 Sagem Procede et dispositif de reception de signaux de frequence et/ou de synchronisation

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1999038270A2 (fr) * 1998-01-22 1999-07-29 British Telecommunications Public Limited Company Reception de signaux a etalement du spectre a interference a bande etroite
FR2822613A1 (fr) * 2001-03-20 2002-09-27 Sagem Procede et dispositif de reception de signaux de frequence et/ou de synchronisation

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
KARAMCHAND BABU, A. R.; ABDUL RASHID, Z. A.;: "Performance evaluation of wideband CDMA air interface", RESEARCH AND DEVELOPEMENT, 2002. SCORED 2002. STUDENT CONFERENCE ON, 16 July 2002 (2002-07-16) - 17 July 2002 (2002-07-17), pages 145 - 148, XP010603493 *

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101399563B (zh) * 2008-10-17 2012-07-04 华为终端有限公司 一种搜索全球移动通讯系统网络的方法、终端和通信系统
TWI510121B (zh) * 2011-11-08 2015-11-21 Mediatek Inc 無線通訊裝置以及通訊作業協調方法
WO2015026467A1 (fr) * 2013-08-19 2015-02-26 Qualcomm Incorporated Procédé d'abandon de détection de salve fcch pour un mesurage inter-technologies d'accès radio (irat)
US9179342B2 (en) 2013-08-19 2015-11-03 Qualcomm Incorporated FCCH burst detection abort method for inter-radio access technology (IRAT) measurement
CN105474693A (zh) * 2013-08-19 2016-04-06 高通股份有限公司 用于无线电接入技术间(irat)测量的fcch突发检测中止方法
CN105474693B (zh) * 2013-08-19 2017-05-31 高通股份有限公司 用于无线电接入技术间(irat)测量的fcch突发检测中止方法和装置
DE102015203166B4 (de) 2014-03-05 2023-08-24 Apple Inc. Verbesserte Erfassung eines Synchronisierungsbeacons

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Publication number Publication date
AU2003272131A1 (en) 2004-05-13
CN1492611A (zh) 2004-04-28
AU2003272131A8 (en) 2004-05-13

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