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WO2000060769A1 - Systeme et procede de correlation des mesures de signaux du canal trafic d'un systeme de communications - Google Patents

Systeme et procede de correlation des mesures de signaux du canal trafic d'un systeme de communications Download PDF

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Publication number
WO2000060769A1
WO2000060769A1 PCT/US2000/008629 US0008629W WO0060769A1 WO 2000060769 A1 WO2000060769 A1 WO 2000060769A1 US 0008629 W US0008629 W US 0008629W WO 0060769 A1 WO0060769 A1 WO 0060769A1
Authority
WO
WIPO (PCT)
Prior art keywords
station
time
taken
measurement
measurements
Prior art date
Application number
PCT/US2000/008629
Other languages
English (en)
Inventor
David S. Miller
Original Assignee
Qualcomm Incorporated
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 Qualcomm Incorporated filed Critical Qualcomm Incorporated
Priority to AU40595/00A priority Critical patent/AU769028B2/en
Priority to CNB008082715A priority patent/CN100373815C/zh
Priority to AT00919991T priority patent/ATE295636T1/de
Priority to HK02105773.0A priority patent/HK1044236A1/zh
Priority to EP00919991A priority patent/EP1169791B1/fr
Priority to DE60020106T priority patent/DE60020106T2/de
Publication of WO2000060769A1 publication Critical patent/WO2000060769A1/fr

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/14—Relay systems
    • H04B7/15—Active relay systems
    • H04B7/185—Space-based or airborne stations; Stations for satellite systems
    • H04B7/1853—Satellite systems for providing telephony service to a mobile station, i.e. mobile satellite service
    • H04B7/18569—Arrangements for system physical machines management, i.e. for construction operations control, administration, maintenance
    • H04B7/18573—Arrangements for system physical machines management, i.e. for construction operations control, administration, maintenance for operations control, administration or maintenance
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/14—Relay systems
    • H04B7/15—Active relay systems
    • H04B7/185—Space-based or airborne stations; Stations for satellite systems
    • H04B7/1853—Satellite systems for providing telephony service to a mobile station, i.e. mobile satellite service
    • H04B7/18545—Arrangements for managing station mobility, i.e. for station registration or localisation
    • H04B7/18547—Arrangements for managing station mobility, i.e. for station registration or localisation for geolocalisation of a station

Definitions

  • the present invention is directed toward a method and apparatus useful for correlating measurements of communications signals taken at two stations in a wireless communication system.
  • a useful application is a communication system having a user terminal and a gateway exchanging spread-spectrum code-division multiple-access communications signals using one or more satellites.
  • measurement of the communication signals received at the first station are repeatedly taken and stored, generally at regular intervals.
  • Measurements of the communication signals received at the second station are taken at a particular time, and one or more of the measurements taken at the first station are selected for correlation that was taken at a time nearest the second or particular time.
  • the measurement taken at the second station is preferably reported to the first station, and the second station selects a pair of stored measurements that were made or stored nearest in time to the first station measurement. The second station then applies interpolation or extrapolation between the two second station measurements to obtain a first station measurement that corresponds to the same time. In further aspects of the invention more than two measurements can be used to select, interpolate, or extrapolate a signal measurement value.
  • the first station is a gateway and the second station is a user terminal. In other embodiments, the second station is a gateway and the first station is a user terminal.
  • FIG. 2 illustrates an exemplary wireless transceiver useful for user terminals in the system of FIG. 1;
  • beams from satellites 116 and 118 cover different geographical areas in predefined patterns. Beams at different frequencies, also referred to as FDMA channels or CDMA channels (where CDMA type signals are used) or "sub-beams,” can be directed to overlap the same region. It is also readily understood by those skilled in the art that beam coverage or service areas for multiple satellites, or antenna patterns for multiple base stations, might be designed to overlap completely or partially in a given region depending on the communication system design and the type of service being offered, and whether space diversity is being achieved.
  • user digital baseband circuitry 222 When voice or other data is prepared as an output message or communications signal originating with the user terminal, user digital baseband circuitry 222 is used to receive, store, process, and otherwise prepare the desired data for transmission. User digital baseband circuitry 222 provides this data to a transmit modulator 226 operating under the control of control processor 220. The output of transmit modulator 226 is transferred to a power controller 228 which provides output power control to a transmit power amplifier 230 for final transmission of the output signal from antenna 210 to a gateway.
  • the portion of gateway 120, 122 illustrated in FIG. 3 has one or more analog receivers 314 connected to an antenna 310 for receiving communication signals which are then downconverted, amplified, and digitized using various schemes well known in the art. Digitized signals are provided as inputs to at least one digital receiver module, indicated by dashed lines generally at 324.
  • One analog receiver 314 can provide inputs for many digital receiver modules 324, and a number of such modules are typically used in gateways to accommodate all of the satellite beams and possible diversity mode signals being accommodated.
  • Each digital receiver module 324 has one or more digital data receivers 316 and searcher receivers 318.
  • a searcher receiver 318 generally searches for appropriate diversity modes of signals other than pilot signals. Where implemented in the communication system, multiple digital data receivers 316A-316N are used for diversity signal reception.
  • a time and frequency unit (TFU) 348 provides reference frequency and timing signals for various stages or processing elements within gateway or base station 300, such as analog receiver 314 and the correlators in digital receivers 316A-N and 318, or transmit modulator 326, and control processor 320. This information is used to establish the frequency or timing adjustment for each satellite being used by the gateway at any given time.
  • a Universal Time (UT) signal from a GPS receiver can be used as part of this process in some applications.
  • TFU 348 is also configured to retard or advance the relative timing of (clock) signals, under processor control, by predetermined amounts, as desired.
  • Gateways utilize known control processors and computer programs to effect many operations. Therefore, there are well known memory elements such as RAM and ROM circuits along with magnetic storage devices and associated storage and retrieval apparatus or devices available for storing such information, as discussed above. Furthermore, measurements are stored using one of many known techniques which allow association or knowledge of the time at which the measurements were taken with the measured value. For example, a memory can be structured such that it stores the measured value and an associated time in pairs. Alternatively, memory locations are indexed or assigned to certain times on some pre-selected time scale. Values are then stored according to the memory location corresponding to the time of the measurement.
  • the gateway memory used for this process can be very transient, that is, the data is preferably deleted or erased after a predetermined length of time which could be fairly short.
  • FIG. 4 is a flowchart depicting the operation of the present invention according to a preferred embodiment.
  • the gateway takes measurements of the signals received at the gateway, as shown in a step 402. Representative measurements are described in commonly-owned, co-pending U. S. Patent Applications entitled “Position Determination Using One Low-Earth Orbit Satellite, " Serial No. 08/723,751; “Passive Position Determination Using Two Low -Earth Orbit Satellites, “ Serial No. 08/723,722; and “Unambiguous Position Determination Using Two Low-Earth Orbit Satellites, " Serial No. 08/723,725, all of which are incorporated herein in their entirety by reference.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Astronomy & Astrophysics (AREA)
  • Aviation & Aerospace Engineering (AREA)
  • General Physics & Mathematics (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

La présente invention concerne un procédé et un appareil convenant à la corrélation des mesures des signaux de communication prises au niveau de stations de base, de passerelles et de terminaux d'usagers d'un système de communications. A cet effet, on commence par prendre à intervalles réguliers des mesures de passerelle et à les stocker. Ensuite, lorsqu'il y a communication à la passerelle d'une mesure de terminal d'usager, la passerelle sélectionne l'une au moins des mesures de passerelle stockées prises au plus près de l'instant où a été effectuée la mesure du terminal d'usager. La passerelle applique alors une procédure d'interpolation utilisant les mesures de passerelle pour obtenir une mesure de passerelle qui corresponde grossièrement à la mesure du terminal d'usager. Pour cette procédure, on peut avoir recours à différentes techniques telles que l'extrapolation et le moyennage mettant en oeuvre plusieurs valeurs de données.
PCT/US2000/008629 1999-04-02 2000-03-31 Systeme et procede de correlation des mesures de signaux du canal trafic d'un systeme de communications WO2000060769A1 (fr)

Priority Applications (6)

Application Number Priority Date Filing Date Title
AU40595/00A AU769028B2 (en) 1999-04-02 2000-03-31 System and method for correlating traffic channel signal measurements in a communications system
CNB008082715A CN100373815C (zh) 1999-04-02 2000-03-31 对通信系统中的话务信道测量值进行相关的方法
AT00919991T ATE295636T1 (de) 1999-04-02 2000-03-31 Anordnung und verfahren zur korrelierung signalmessungen auf verkehrskanalen in kommunikationssystemen
HK02105773.0A HK1044236A1 (zh) 1999-04-02 2000-03-31 对通信系统中话务信道测量值进行相关的系统和方法
EP00919991A EP1169791B1 (fr) 1999-04-02 2000-03-31 Systeme et procede de correlation des mesures de signaux du canal trafic d'un systeme de communications
DE60020106T DE60020106T2 (de) 1999-04-02 2000-03-31 Anordnung und verfahren zur korrelierung signalmessungen auf verkehrskanalen in kommunikationssystemen

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US12749099P 1999-04-02 1999-04-02
US60/127,490 1999-04-02

Publications (1)

Publication Number Publication Date
WO2000060769A1 true WO2000060769A1 (fr) 2000-10-12

Family

ID=22430415

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US2000/008629 WO2000060769A1 (fr) 1999-04-02 2000-03-31 Systeme et procede de correlation des mesures de signaux du canal trafic d'un systeme de communications

Country Status (1)

Country Link
WO (1) WO2000060769A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1497933B1 (fr) * 2002-04-09 2012-03-14 Alcatel Lucent Systeme et procede d'interconnexion en temps reel d'elements d'un systeme de surveillance, de mesure ou de collecte de donnees sur un territoire etendu grace a un systeme de multiplexage direct par diffusion satellite numerique

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5448758A (en) * 1993-02-26 1995-09-05 Motorola, Inc. Simulcast group determination of best signal by master site
US5530915A (en) * 1993-02-26 1996-06-25 Motorola, Inc. Method for determining and utilizing simulcast transmit times by master transceiver
US5742635A (en) * 1994-05-05 1998-04-21 Sanconix, Inc. Enhanced time of arrival method

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5448758A (en) * 1993-02-26 1995-09-05 Motorola, Inc. Simulcast group determination of best signal by master site
US5530915A (en) * 1993-02-26 1996-06-25 Motorola, Inc. Method for determining and utilizing simulcast transmit times by master transceiver
US5742635A (en) * 1994-05-05 1998-04-21 Sanconix, Inc. Enhanced time of arrival method

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1497933B1 (fr) * 2002-04-09 2012-03-14 Alcatel Lucent Systeme et procede d'interconnexion en temps reel d'elements d'un systeme de surveillance, de mesure ou de collecte de donnees sur un territoire etendu grace a un systeme de multiplexage direct par diffusion satellite numerique

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