WO2009065255A1 - Station de base cdma et procédé de traitement de signaux utilisé dans celle-ci - Google Patents

Station de base cdma et procédé de traitement de signaux utilisé dans celle-ci Download PDF

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Publication number
WO2009065255A1
WO2009065255A1 PCT/CN2007/003295 CN2007003295W WO2009065255A1 WO 2009065255 A1 WO2009065255 A1 WO 2009065255A1 CN 2007003295 W CN2007003295 W CN 2007003295W WO 2009065255 A1 WO2009065255 A1 WO 2009065255A1
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WO
WIPO (PCT)
Prior art keywords
split signals
unit
timing advance
base station
local
Prior art date
Application number
PCT/CN2007/003295
Other languages
English (en)
Inventor
Hairong Xie
Steven Shio
Original Assignee
Lucent Technologies Inc.
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 Lucent Technologies Inc. filed Critical Lucent Technologies Inc.
Priority to CN200780101572.7A priority Critical patent/CN101884243B/zh
Priority to PCT/CN2007/003295 priority patent/WO2009065255A1/fr
Publication of WO2009065255A1 publication Critical patent/WO2009065255A1/fr

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Classifications

    • 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
    • H04W88/08—Access point devices
    • H04W88/085—Access point devices with remote components

Definitions

  • the present invention relates to the field of radio communication, in particular the invention relates to a novel CDMA base station and a signal processing method used to improve the performance of the CDMA optical repeaters.
  • Fiber optic repeaters are widely used in the Code Division Multiple Access (CDMA) wireless networks. They are cost effective; however, they also introduce some issues to the network. One of them is the handoff issue between the repeater and the neighbor cells. If the delay relationship between the repeater coverage and the neighbor cells' coverage is not properly configured, the mobile station could not successfully search the pilot signals of the neighbor cells, thus the handoff between them would be problematic.
  • CDMA Code Division Multiple Access
  • the active/neighbor search window size must be enlarged to compensate for the fiber delay to solve the above handoff issues.
  • RF Radio Frequency
  • a current repeater is transparent to the network, and it does not change any characteristic of the signals except amplifying them. So, the pilot PN (Pseudo Noise) offset is the same as that transmitted from the donor Base Transceiver Station (BTS).
  • BTS Base Transceiver Station
  • the pilot PN Pseudo Noise
  • the repeater receives the signals from the mobile stations and feeds them to the donor BTS.
  • Fig. 1 illustrates the block diagram for the connection of a conventional repeater.
  • a repeater antenna 1501 is for the remote coverage, while a local antenna 140 is for the local coverage.
  • the remote unit 1801 of the repeater can be connected with the local master unit 120 of the repeater through the optical fiber 1951.
  • the local master unit 120 is connected with the base station by using the three-port RF component: coupler 160. Normally this coupler 160 has a high coupler loss, for example, 4OdB, thus the loss for the local coverage signal is very small and can be negligible.
  • the base station 110 is used to generate the forward link CDMA signal and process the reverse link signal transmitted by mobiles.
  • Fig. 2 illustrates the transition area between the repeater and the donor cell.
  • the donor BTS provides a local coverage 210, while a repeater provides a remote coverage 220.
  • the repeater and the donor sector have the same PN offset configuration.
  • a mobile station (MS) 240 is initially located at the repeater coverage 220.
  • the delay includes three parts: the fiber delay (D F ), repeater internal delay (D ⁇ ) and the propagation delay (D P _ repealer ) from the repeater remote antenna to the MS 240.
  • the MS 240 will try to find the forward link signal broadcast directly from the donor BTS antenna.
  • this signal also has the delay from donor BTS antenna to MS 240, and it can be noted as D P _ bls .
  • the 240 will use the timing information demodulated from the repeater as the reference timing, and it will place the center of its pilot search window at that reference time.
  • the mobile station 240 can find the forward link from the donor BTS. So the delay difference of the signals from the repeater and the BTS must be less than the half of the active set search window:
  • W is the search window size of active set.
  • the call can move smoothly from repeater coverage 220 to the donor BTS coverage 210, otherwise the call will be dropped.
  • Timing advance and timing delay technology is used to synchronize the donor cell signal and the remote repeater signal.
  • a CDMA base station which comprises: a timing advance unit for generating a signal ahead of the time when it should be transmitted from an antenna of a local cell by a predetermined timing advance value; a splitter for splitting the signal generated by the timing advance unit into two branches; a delay unit for delaying a first branch of split signals by the predetermined timing advance value; and a radio processing unit for receiving both the first delayed branch of split signals and a second non-delayed branch of split signals, performing the same Digital-Analog conversion and RF processing to the first and the second branches of split signals respectively, and then outputting the processed first delayed branch of split signals for the usage of the local cell, and outputting the processed second non-delayed branch of split signals to a local unit of an optical repeater to be transmitted for the usage of a remote cell.
  • a signal processing method used in a CDMA base station which comprises the steps of: generating a signal ahead of the time when it should be transmitted from an antenna of a local cell by a predetermined timing advance value; splitting the generated signal into two branches; delaying a first branch of split signals by the predetermined timing advance value; performing the same Digital-Analog conversion and RF processing to the first and the second branches of split signals respectively; and outputting the processed first delayed branch of split signals for the usage of the local cell, and outputting the processed second non-delayed branch of split signals to a local unit of an optical repeater to be transmitted for the usage of a remote cell.
  • the present invention will effectively improve the fiber optic performance. Thereby, network designers do not need to update active/neighbor set search window sizes since the repeater signal has been synchronized with the system timing
  • Fig. 1 is a block diagram showing a conventional connection structure of an optical repeater
  • Fig. 2 already described, is a schematic diagram illustrating the transition area between the repeater and the donor cell.
  • Fig. 3 is a block diagram showing the system construction according to the present invention.
  • Fig. 3 shows a block diagram of the system construction according to the present invention. Since the solution provided by the invention is mainly applicable to the forward link of a base station, only the forward link configuration is described in this figure.
  • element T.A. 310 represents a timing advance module.
  • the timing advance function is provided by the CDMA cell site modem chip, so that the new traffic frame can be generated ahead of the time when it should be transmitted from the antenna of the cell.
  • the typical timing advance budget (that is, the upper limit of the timing advance value) for 3G1x is about 400 chips.
  • the splitter 320 splits the base band data into two branches. The first branch goes through a radio processing module 340 and is fed into the local unit of the optic repeater 350, while the other branch is delayed by several chips (same as the T.A. chips) in a delay unit 330 and then goes through the radio processing module 340.
  • the other branch of signal is the original donor cell's coverage signal, and thus it passes through a high power amplifier 360 and then is fed into a local coverage antenna 370.
  • the radio processing module 340 performs a number of functionalities which are described as follows. It will firstly convert the base band digital signal into an analog signal using a Digital-Analog converter. Then, a conventional mixer is used to change the signal into a high-frequency signal. Some filters and gain blocks would be used for the RF processing.
  • the local unit of optical repeater 350 basically receives the RF signal from the module 340 and changes the RF signal into an optical signal and feeds it into the remote unit 380 through the fiber connection which is denoted as 395.
  • the remote unit of the fiber optical repeater 380 will convert the optical signal from local unit 350 into an RF signal. Then the RF signal will be amplified and fed to the antenna 390 for the remote coverage.
  • radio processing module 340 is shown in this embodiment, but the present invention is not limited to only one such module.
  • the radio processing module can be separated into two sub-modules, one for the first branch, and the other for the second branch.
  • the parameter D f needs to be configured by MSC/BSC (Mobile Switching Center/Base Station Controller), which will notify to the cell the delay information. Then the cell will notify the parameter D f chips to both the T.A. 310 and the delay unit 330.
  • MSC/BSC Mobile Switching Center/Base Station Controller
  • the traffic data is first "timing advanced” (by element TA. 310) and then delayed by the same time interval (by the delay unit
  • the traffic frames are still aligned with the system timing.
  • the traffic data is first "timing advanced" (by element T.A. 310) and then delayed by the optical fiber 395 by the same interval D f , so the traffic frames are also aligned with the system timing.
  • the signals from both the local antenna and the remote antenna are synchronized with the system timing, so no delay issue will occur.
  • the invention also proposes a signal processing method for use in a CDMA base station.
  • a signal is generated ahead of the time when it should be transmitted from an antenna 370 of a local cell by a timing advance value.
  • the generated signal is split into two branches. For these two branches of signals, a first branch of split signals is delayed by the timing advance value, whereas a second branch of split signals is remained non-delayed. Thereafter, the same Digital-Analog conversion and RF processing are performed to the first and the second branches of split signals respectively.
  • the processed first delayed branch of split signals is outputted for the usage of the local cell, and the processed second non-delayed branch of split signals is outputted to a local unit of an optical repeater 350 to be transmitted for the usage of a remote cell.
  • the timing advance value is also determined as aforementioned so that the signals from both the local antenna and the remote antenna are synchronized with the system timing, and thus no delay issue will occur.

Landscapes

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

Abstract

La présente invention concerne une nouvelle solution pour résoudre le problème de retard de fibre dans un répéteur optique. Selon la présente invention, une station de base CDMA comprend : une unité de temporisation d'avance pour générer un signal avant le moment où il devrait être transmis depuis une antenne d'une cellule locale d'une valeur de temporisation d'avance prédéterminée; un diviseur pour diviser le signal généré par l'unité de temporisation d'avance en deux branches; une unité de retard pour retarder une première branche de signaux divisés de la valeur de temporisation d'avance prédéterminée; et une unité de traitement radio pour recevoir à la fois la première branche retardée de signaux divisés et une seconde branche non retardée de signaux divisés, réalisant la même conversion numérique-analogique et le même traitement RF sur les première et seconde branches de signaux divisés respectivement, puis émettant la première branche retardée traitée de signaux divisés pour l'usage de la cellule locale, et émettant la seconde branche non retardée traitée de signaux divisés vers une unité locale d'un répéteur optique à transmettre pour l'usage d'une cellule distante. La présente invention concerne également un procédé de traitement de signaux correspondant pour l'usage dans une station de base CDMA.
PCT/CN2007/003295 2007-11-21 2007-11-21 Station de base cdma et procédé de traitement de signaux utilisé dans celle-ci WO2009065255A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
CN200780101572.7A CN101884243B (zh) 2007-11-21 2007-11-21 Cdma基站和用在其中的信号处理方法
PCT/CN2007/003295 WO2009065255A1 (fr) 2007-11-21 2007-11-21 Station de base cdma et procédé de traitement de signaux utilisé dans celle-ci

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/CN2007/003295 WO2009065255A1 (fr) 2007-11-21 2007-11-21 Station de base cdma et procédé de traitement de signaux utilisé dans celle-ci

Publications (1)

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WO2009065255A1 true WO2009065255A1 (fr) 2009-05-28

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CN (1) CN101884243B (fr)
WO (1) WO2009065255A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104735824A (zh) * 2015-02-28 2015-06-24 华为技术有限公司 数据处理系统

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103891171B (zh) * 2011-11-01 2016-11-23 瑞典爱立信有限公司 中继节点、用于中继节点的主单元和其中的方法
EP3611851B1 (fr) 2014-11-06 2021-03-03 Commscope Technologies LLC Compensation de retard statique dans un système de télécommunications

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1995005037A1 (fr) * 1993-08-06 1995-02-16 Ntt Mobile Communications Network Inc. Recepteur et repeteur pour communications a spectre etale
WO1997032446A1 (fr) * 1996-02-29 1997-09-04 Motorola Inc. Appareil et procede visant a reduire les temps de propagation excedentaires dans un systeme de communications sans fil
CN1859033A (zh) * 2005-10-14 2006-11-08 华为技术有限公司 移频直放站中获取参考时钟的系统及其方法

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1995005037A1 (fr) * 1993-08-06 1995-02-16 Ntt Mobile Communications Network Inc. Recepteur et repeteur pour communications a spectre etale
WO1997032446A1 (fr) * 1996-02-29 1997-09-04 Motorola Inc. Appareil et procede visant a reduire les temps de propagation excedentaires dans un systeme de communications sans fil
CN1859033A (zh) * 2005-10-14 2006-11-08 华为技术有限公司 移频直放站中获取参考时钟的系统及其方法

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104735824A (zh) * 2015-02-28 2015-06-24 华为技术有限公司 数据处理系统
EP3169136A4 (fr) * 2015-02-28 2017-08-09 Huawei Technologies Co., Ltd. Système de traitement de données
CN104735824B (zh) * 2015-02-28 2018-03-13 华为技术有限公司 数据处理系统

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Publication number Publication date
CN101884243B (zh) 2013-04-17
CN101884243A (zh) 2010-11-10

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