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RU2222102C2 - Поддерживаемая подвижной станцией синхронизация установки времени в системе связи cdma - Google Patents

Поддерживаемая подвижной станцией синхронизация установки времени в системе связи cdma Download PDF

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RU2222102C2
RU2222102C2 RU2000121546/09A RU2000121546A RU2222102C2 RU 2222102 C2 RU2222102 C2 RU 2222102C2 RU 2000121546/09 A RU2000121546/09 A RU 2000121546/09A RU 2000121546 A RU2000121546 A RU 2000121546A RU 2222102 C2 RU2222102 C2 RU 2222102C2
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base station
mobile station
station
mobile
slave base
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RU2000121546/09A
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RU2000121546A (ru
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Чарльз Е. УИТЛИ III (US)
Чарльз Е. Уитли III
мл. ТИДМАНН Эдвард Дж. (US)
мл. Тидманн Эдвард Дж.
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Квэлкомм Инкорпорейтед
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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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/24—Radio transmission systems, i.e. using radiation field for communication between two or more posts
    • H04B7/26—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile
    • H04B7/2662—Arrangements for Wireless System Synchronisation
    • H04B7/2671—Arrangements for Wireless Time-Division Multiple Access [TDMA] System Synchronisation
    • H04B7/2678—Time synchronisation
    • H04B7/2687—Inter base stations synchronisation
    • 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
    • H04B1/7073—Synchronisation aspects
    • H04B1/7075—Synchronisation aspects with code phase acquisition
    • 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
    • H04B1/7073—Synchronisation aspects
    • H04B1/7075—Synchronisation aspects with code phase acquisition
    • H04B1/70751—Synchronisation aspects with code phase acquisition using partial detection
    • H04B1/70753—Partial phase search
    • 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
    • H04B1/7073—Synchronisation aspects
    • H04B1/7075—Synchronisation aspects with code phase acquisition
    • H04B1/7077—Multi-step acquisition, e.g. multi-dwell, coarse-fine or validation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/24—Radio transmission systems, i.e. using radiation field for communication between two or more posts
    • H04B7/26—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile
    • H04B7/2662—Arrangements for Wireless System Synchronisation
    • H04B7/2668—Arrangements for Wireless Code-Division Multiple Access [CDMA] System Synchronisation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J3/00—Time-division multiplex systems
    • H04J3/02—Details
    • H04J3/06—Synchronising arrangements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J3/00—Time-division multiplex systems
    • H04J3/02—Details
    • H04J3/06—Synchronising arrangements
    • H04J3/0635—Clock or time synchronisation in a network
    • H04J3/0682—Clock or time synchronisation in a network by delay compensation, e.g. by compensation of propagation delay or variations thereof, by ranging
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W56/00—Synchronisation arrangements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W56/00—Synchronisation arrangements
    • H04W56/003—Arrangements to increase tolerance to errors in transmission or reception timing
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B2201/00—Indexing scheme relating to details of transmission systems not covered by a single group of H04B3/00 - H04B13/00
    • H04B2201/69—Orthogonal indexing scheme relating to spread spectrum techniques in general
    • H04B2201/707—Orthogonal indexing scheme relating to spread spectrum techniques in general relating to direct sequence modulation
    • H04B2201/70701—Orthogonal indexing scheme relating to spread spectrum techniques in general relating to direct sequence modulation featuring pilot assisted reception
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B2201/00—Indexing scheme relating to details of transmission systems not covered by a single group of H04B3/00 - H04B13/00
    • H04B2201/69—Orthogonal indexing scheme relating to spread spectrum techniques in general
    • H04B2201/707—Orthogonal indexing scheme relating to spread spectrum techniques in general relating to direct sequence modulation
    • H04B2201/70702—Intercell-related aspects
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J13/00—Code division multiplex systems

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

Abstract

Изобретение относится к системам связи. Технический результат заключается в обеспечении синхронизации по времени в условиях, когда часть сети способна принимать централизованный сигнал синхронизации и достигать синхронизации от него, а часть базовых станций не способна его принимать. Для этого ведомая базовая станция достигает синхронизации с ведущей базовой станцией через сообщения, переданные от подвижной станции и принятые подвижной станцией либо в зоне мягкой передачи обслуживания между ведущей базовой станцией и ведомой базовой станцией, либо в пределах дальности действия, которая позволяет подвижной станции поддерживать связь с ведомой базовой станцией. Когда подвижная станция не находится в связи как с ведущей базовой станцией, так и с ведомой базовой станцией, тогда ведущая базовая станция измеряет задержку прохождения сигнала в прямом и обратном направлениях между подвижной станцией и ведущей базовой станцией. Ведущая базовая станция передает ПШ код, используемый подвижной станцией, по обратной линии связи к ведомой базовой станции. Ведомая базовая станция захватывает сигнал от подвижной станции и определяет, когда поступает сигнал от подвижной станции. Ведомая базовая станция затем выполняет это и оценивает длительность задержки между передачей сигнала от подвижной станции (60) к ведомой базовой станции (64). На основании этих измерений и оценок ведомая базовая станция (64) определяет погрешность, которая имеется в системном времени ведомой базовой станции. 7 з.п. ф-лы, 9 ил., 1 табл.

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Текст описания в факсимильном виде (см. графический материал)о

Claims (8)

1. Способ синхронизации по времени второй базовой станции с первой базовой станцией, заключающийся в том, что измеряют интервал задержки прохождения сигнала в прямом и обратном направлениях от первой базовой станции к подвижной станции, находящейся в связи с первой базовой станцией, и обратно от подвижной станции к первой базовой станции, передают информацию от первой базовой станции ко второй базовой станции, чтобы помочь второй базовой станции в приеме передач от подвижной станции, принимают во второй базовой станции передачи, переданные подвижной станцией, и отмечают время приема, определяют во второй базовой станции оценку задержки, которая возникла между передачей подвижной станции и приемом второй базовой станцией, вычисляют величину коррекции синхронизации на основании оценки задержки, времени приема во второй базовой станции передачи от подвижной станции ко второй базовой станции и измеренного интервала задержки прохождения сигнала в прямом и обратном направлениях.
2. Способ по п.1, отличающийся тем, что принимают во второй базовой станции сообщение, указывающее идентификацию упомянутой подвижной станции.
3. Способ по п.2, отличающийся тем, что упомянутое сообщение посылают во вторую базовую станцию из первой базовой станции.
4. Способ по п.3, отличающийся тем, что упомянутое сообщение посылают с помощью первой базовой станции во вторую базовую станцию через контроллер базовых станций, находящийся в связи с первой базовой станцией и со второй базовой станцией.
5. Способ по п.2, отличающийся тем, что принимают передачи от множества подвижных станций, выбирают подвижную станцию, которая имеет наиболее высокую вероятность осуществления связи со второй базовой станцией, посылают упомянутое сообщение, указывающее идентификацию упомянутой подвижной станции.
6. Способ по п.5, отличающийся тем, что выбор подвижной станции осуществляют путем выбора подвижной станции, наиболее удаленной от первой базовой станции.
7. Способ по п.6, отличающийся тем, что первая базовая станция определяет подвижную станцию, наиболее удаленную от первой базовой станции в соответствии с состоянием средства расширения ПШ (псевдошума).
8. Способ по п.6, отличающийся тем, что упомянутый выбор осуществляют в соответствии с сектором первой базовой станции, находящейся на связи с подвижной станцией.
RU2000121546/09A 1998-01-16 1999-01-15 Поддерживаемая подвижной станцией синхронизация установки времени в системе связи cdma RU2222102C2 (ru)

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US09/008,203 US6307840B1 (en) 1997-09-19 1998-01-16 Mobile station assisted timing synchronization in CDMA communication system
US09/008,203 1998-01-16

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RU2001127978/09A RU2294059C2 (ru) 1998-01-16 1999-01-15 Поддерживаемая подвижной станцией синхронизация установки времени в системе связи мдкр
RU2006138270/09A RU2425469C2 (ru) 1998-01-16 2006-10-30 Поддерживаемая подвижной станцией синхронизация установки времени в системе связи мдкр

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RU2006138270/09A RU2425469C2 (ru) 1998-01-16 2006-10-30 Поддерживаемая подвижной станцией синхронизация установки времени в системе связи мдкр

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