WO2014117322A1 - 同步方法和基站 - Google Patents

同步方法和基站 Download PDF

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Publication number
WO2014117322A1
WO2014117322A1 PCT/CN2013/071074 CN2013071074W WO2014117322A1 WO 2014117322 A1 WO2014117322 A1 WO 2014117322A1 CN 2013071074 W CN2013071074 W CN 2013071074W WO 2014117322 A1 WO2014117322 A1 WO 2014117322A1
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WO
WIPO (PCT)
Prior art keywords
base station
synchronization
reference signal
station
synchronization reference
Prior art date
Application number
PCT/CN2013/071074
Other languages
English (en)
French (fr)
Inventor
李洋
李强
夏亮
Original Assignee
华为技术有限公司
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 华为技术有限公司 filed Critical 华为技术有限公司
Priority to PCT/CN2013/071074 priority Critical patent/WO2014117322A1/zh
Priority to EP13874178.0A priority patent/EP2943023B1/en
Priority to CN201380004667.2A priority patent/CN104094647B/zh
Publication of WO2014117322A1 publication Critical patent/WO2014117322A1/zh
Priority to US14/812,586 priority patent/US9854550B2/en

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Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W56/00Synchronisation arrangements
    • H04W56/001Synchronization between nodes
    • H04W56/0015Synchronization between nodes one node acting as a reference for the others
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00Arrangements affording multiple use of the transmission path
    • H04L5/14Two-way operation using the same type of signal, i.e. duplex
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W72/00Local resource management
    • H04W72/20Control channels or signalling for resource management
    • H04W72/23Control channels or signalling for resource management in the downlink direction of a wireless link, i.e. towards a terminal

Definitions

  • the present invention relates to communication technologies, and in particular, to a synchronization method and a base station. Background technique
  • a small cell can be densely deployed in some indoor or outdoor hotspot areas on the basis of the traditional macro base station cellular network.
  • the small cell is characterized by a small coverage range and low transmission power, and is suitable for providing a high-speed data transmission service, and performs data offloading on the macro cellular network to reduce the cost of the operator's network.
  • the form of the small cell may include: a multi-cell cell, a micro cell, a pico cell, a femto cell or a wireless using wireless fidelity (wifi) technology.
  • a wireless local area network (WLAN), etc. may be referred to as a small base station by using different wireless network access nodes.
  • the small base stations need to be synchronized, and at the same time, the small base stations also need to provide downlink synchronization for the user equipment (User Equipment, UE) in the cell.
  • the small base station uses the same configuration to send the synchronization reference signal to implement inter-station synchronization and UE downlink synchronization. Since the small base station cannot simultaneously transmit and receive at the same frequency, the small base station receives the other small base station for the station.
  • the synchronization reference signal for synchronization and the synchronization reference signal for downlink synchronization of the UE transmitted by the small base station to the UE in the cell need at least one transmission period of the synchronization reference signal, and when the period is long, inter-station synchronization is implemented. It takes a long time to synchronize with the UE, which will undoubtedly affect the timing synchronization performance. Summary of the invention
  • the embodiments of the present invention provide a synchronization method and a base station, which are used to solve the problem of poor synchronization performance existing in the prior art.
  • a synchronization method including:
  • the base station determines its own synchronization state, and the synchronization state includes: a synchronized base station, or a synchronization source base station;
  • the base station configures the synchronization reference signal of the base station according to the synchronization state of the base station, so that the first time is different from the second time, the first time is the time at which the synchronization reference signal of the base station is located, and the second time is The time at which the synchronization reference signal of the synchronization source base station of the base station is located for inter-station synchronization.
  • the configuring the synchronization reference signal of the base station includes:
  • the synchronization reference signal configured by the base station includes a downlink synchronization reference signal of the user equipment UE of the base station at different times and an inter-station synchronization reference signal of the base station, and the base station
  • the UE downlink synchronization reference signal is located at a different time from the inter-station synchronization reference signal of the synchronization source base station of the base station, and the inter-station synchronization reference signal of the base station is different from the inter-station synchronization reference signal of the synchronization source base station of the base station.
  • the synchronization reference signal configured by the base station includes a UE downlink synchronization reference signal of the base station, and the UE downlink synchronization reference signal of the base station and the synchronization source base station of the base station The synchronization reference signal is at a different time;
  • the inter-station synchronization reference signal of the synchronization source base station of the base station is a synchronization reference signal for inter-station synchronization in the synchronization reference signal of the synchronization source base station of the base station.
  • the synchronization reference signal of the synchronization source base station of the base station further includes a UE of the synchronization source base station of the base station
  • the downlink synchronization reference signal, the configuring the synchronization reference signal of the base station further includes:
  • the UE downlink synchronization reference signal of the base station is configured to be located at the same time as the UE downlink synchronization reference signal of the synchronization source base station of the base station.
  • the following parameters of the UE downlink synchronization reference signal and the inter-station synchronization reference signal are All the same or at least one different:
  • Sequence generation formula sequence length, transmit power, frequency domain resource mapping pattern.
  • the configuring the synchronization reference signal of the base station includes:
  • the synchronization reference signal of the base station is configured to be at a different time from the synchronization reference signal of the synchronization source base station of the base station, where the synchronization reference signal is used for downlink synchronization of the UE and synchronization between stations.
  • the synchronization state further includes a synchronization level, where the configuring the base station
  • the synchronization reference signal also includes:
  • the synchronization reference signal configured to the base station is located differently from the synchronization reference signal of the other base station.
  • the synchronization reference signal of the base station is configured to be at the same time as the synchronization reference signal of the another base station.
  • the synchronization reference signal of the base station is configured to be at the same time or different timing as the synchronization reference signal of the another base station.
  • a sixth possible implementation manner of the first aspect when the synchronization reference signal of the base station is the same as the synchronization reference signal of another base station with the same synchronization level And configuring, by the time base, the synchronization reference signal of the base station, further comprising: configuring a sequence in which the synchronization reference signal of the base station and the synchronization reference signal of the another base station are orthogonal to each other; or
  • the synchronization reference signal of the base station is configured to use the same sequence as the synchronization reference signal of the other base station.
  • the determining, by the base station, the synchronization status of the base station includes: After receiving the notification signaling sent by the other base station, the base station determines that it is the synchronization source base station; when the base station does not receive the notification signaling sent by other base stations, it determines that it is the synchronized base station; the other base station is The base station serves as a base station of a synchronization source base station.
  • the synchronization status further includes a synchronization level
  • the determining, by the base station, the synchronization status, the method further includes:
  • the synchronization level of the synchronization source base station of the base station is determined according to the synchronization level of the base station, wherein the synchronization level of the base station is different from the synchronization level of the synchronization source base station of the base station by one.
  • the method further includes:
  • the base station periodically detects synchronization to obtain a reference signal, and obtains a reference signal according to the detected synchronization to reselect the synchronization source base station of the base station;
  • the base station After the base station reselects the synchronization source base station, the base station sends signaling for the synchronization and synchronization relationship to the synchronization source base station before the reselection; or
  • the base station After detecting, as the synchronization source base station, the base station detects that its own synchronization relationship is completely translated, and the self-synchronization state is transferred from the synchronization source base station to the synchronized base station; or the base station receives the other base station after being the synchronized base station. After the notification signaling, the self-synchronization state is transferred from the synchronized base station to the synchronization source base station, and the other base station is the base station that uses the base station as the synchronization source base station.
  • the base station is configured to receive the synchronization source base station of the base station The time at which the synchronization reference signal for inter-station synchronization is located does not transmit the downlink signal of the cell where the base station is located; or
  • the base station does not send the downlink signal of the cell where the base station is located when receiving the synchronization time reference signal of the synchronization source base station of the base station where the synchronization reference signal is located.
  • the synchronization reference signal is a synchronization tracking reference signal.
  • the synchronization reference signal used for inter-station synchronization is located in a protection time slot in a special subframe; or, when the system in which the base station is located is an LTE system, the synchronization reference signal used for inter-station synchronization Located in the MBSFN subframe.
  • a base station including:
  • a determining module configured to determine a synchronization state of the synchronization, where the synchronization state includes: a synchronized base station, or a synchronization source base station;
  • a configuration module configured to configure a synchronization reference signal of the base station according to a synchronization state of the base station, so that the first time is different from the second time, where the first time is a time at which the synchronization reference signal of the base station is located, and the second The time is the time at which the synchronization reference signal for the inter-station synchronization of the synchronization source base station of the base station is located.
  • the configuration module is specifically configured to:
  • the synchronization reference signal configured by the base station includes a downlink synchronization reference signal of the user equipment UE of the base station at different times and an inter-station synchronization reference signal of the base station, and the base station
  • the UE downlink synchronization reference signal is located at a different time from the inter-station synchronization reference signal of the synchronization source of the base station
  • the inter-station synchronization reference signal of the base station is located at a different time from the inter-station synchronization reference signal of the synchronization source of the base station.
  • the synchronization reference signal configured by the base station includes a UE downlink synchronization reference signal of the base station, and the UE downlink synchronization reference signal of the base station is synchronized with the synchronization source of the base station.
  • the reference signal is at a different time;
  • the inter-station synchronization reference signal of the synchronization source of the base station is a synchronization reference signal for inter-station synchronization in the synchronization reference signal of the synchronization source of the base station.
  • the synchronization reference signal of the synchronization source of the base station further includes downlink synchronization of the UE of the synchronization source of the base station
  • the reference signal, the configuration module is further configured to:
  • the UE downlink synchronization reference signal of the base station is configured to be located at the same time as the UE downlink synchronization reference signal of the synchronization source base station of the base station.
  • the following parameters of the UE downlink synchronization reference signal and the inter-station synchronization reference signal are All the same or at least one different:
  • Sequence generation formula sequence length, transmit power, frequency domain resource mapping pattern.
  • the configuration module is specifically configured to:
  • the synchronization reference signal of the base station is configured to be at a different time from the synchronization reference signal of the synchronization source base station of the base station, and the synchronization reference signal is used for UE downlink synchronization and inter-station synchronization.
  • the configuration module is further configured to:
  • the synchronization reference signal configured to the base station is located differently from the synchronization reference signal of the other base station.
  • the difference between the synchronization level of the base station and the synchronization level of another base station is greater than or equal to a preset greater than 1 threshold, the synchronization reference signal of the base station is configured to be at the same time as the synchronization reference signal of the another base station.
  • the synchronization reference signal of the base station is configured to be at the same time or different timing as the synchronization reference signal of the another base station.
  • the configuration module is further configured to:
  • the synchronization reference signal of the base station is configured to use the same sequence as the synchronization reference signal of the other base station.
  • the determining module is specifically configured to:
  • the base station After the base station receives the notification signaling sent by the other base station, it determines that it is the synchronization source base station; when the base station does not receive the notification signaling sent by the other base station, it determines that it is the synchronized base station;
  • the other base station is a base station that uses the base station as a synchronization source base station.
  • the synchronization state further includes a synchronization level
  • the determining module is further configured to:
  • the synchronization level of the synchronization source base station of the base station is determined according to the synchronization level of the base station, wherein the synchronization level of the base station is different from the synchronization level of the synchronization source base station of the base station by one.
  • the method further includes:
  • An update module configured to periodically detect synchronization to obtain a reference signal, and obtain a reference signal to reselect the synchronization source base station of the base station according to the detected synchronization; or, after reselecting the synchronization source base station, send the synchronization source base station before reselection Or signaling for decoding the synchronization relationship; or, after detecting the synchronization relationship of the synchronization relationship as the synchronization source base station, transferring the synchronization state from the synchronization source base station to the synchronized base station; or the base station is acting as Received notifications from other base stations after being synchronized by the base station After the signaling, the self-synchronization state is transferred from the synchronized base station to the synchronization source base station, and the other base station is the base station that uses the base station as the synchronization source base station.
  • the configuration module is further configured to:
  • the downlink signal of the cell where the base station is located is not transmitted;
  • the downlink signal of the cell where the base station is located is not transmitted at the time-frequency position where the synchronization reference signal for inter-station synchronization of the synchronization source base station of the base station is located.
  • the synchronization reference signal is a synchronization tracking reference signal.
  • the synchronization reference signal used for inter-station synchronization is located in a protection time slot in a special subframe; or, when the system in which the base station is located is an LTE system, the synchronization reference signal used for inter-station synchronization Located in the MBSFN subframe.
  • a base station including:
  • a processor configured to determine a synchronization state of the synchronization, the synchronization state includes: a synchronized base station, or a synchronization source base station, and a synchronization level; and configuring a synchronization reference signal of the base station according to a synchronization state thereof, so that the first moment Different from the second time, the first time is a time at which the synchronization reference signal of the base station is located, and the second time is a time at which the synchronization reference signal for the inter-station synchronization of the synchronization source base station of the base station is located.
  • the processor is specifically configured to:
  • the synchronization reference signal configured by the base station includes a downlink synchronization reference signal of the user equipment UE of the base station at different times and an inter-station synchronization reference signal of the base station, and the base station
  • the UE downlink synchronization reference signal is located at a different time from the inter-station synchronization reference signal of the synchronization source base station of the base station, and the inter-station synchronization reference signal of the base station is different from the inter-station synchronization reference signal of the synchronization source base station of the base station.
  • configuring a synchronization reference signal of the base station includes the base a UE downlink synchronization reference signal of the station, and the UE downlink synchronization reference signal of the base station is located at a different time from the inter-station synchronization reference signal of the synchronization source base station of the base station;
  • the inter-station synchronization reference signal of the synchronization source base station of the base station is a synchronization reference signal for inter-station synchronization in the synchronization reference signal of the synchronization source base station of the base station.
  • the synchronization reference signal of the synchronization source base station of the base station further includes a UE of the synchronization source base station of the base station a downlink synchronization reference signal
  • the processor is further configured to:
  • the UE downlink synchronization reference signal of the base station is configured to be located at the same time as the UE downlink synchronization reference signal of the synchronization source base station of the base station.
  • the following parameters of the UE downlink synchronization reference signal and the inter-station synchronization reference signal are All the same or at least one different:
  • Sequence generation formula sequence length, transmit power, frequency domain resource mapping pattern.
  • the processor is specifically configured to:
  • the synchronization reference signal of the base station is configured to be at a different time from the synchronization reference signal of the synchronization source base station of the base station, and the synchronization reference signal is used for UE downlink synchronization and inter-station synchronization.
  • the processor is further configured to:
  • the synchronization reference signal configured to the base station is located differently from the synchronization reference signal of the other base station.
  • the synchronization reference signal of the base station is configured to be at the same time as the synchronization reference signal of the another base station.
  • the synchronization reference signal of the base station is configured to be at the same time or different timing as the synchronization reference signal of the another base station.
  • the processor is further configured to: Configuring a sequence in which the synchronization reference signal of the base station and the synchronization reference signal of the another base station are orthogonal to each other; or
  • the synchronization reference signal of the base station is configured to use the same sequence as the synchronization reference signal of the other base station.
  • the method further includes:
  • a transceiver configured to receive notification signaling sent by other base stations
  • the processor is specifically configured to: after the transceiver receives the notification signaling sent by the other base station, determine that it is the synchronization source base station; or, after the transceiver does not receive the notification signaling sent by the other base station, determine It is itself a synchronized base station;
  • the other base station is a base station that uses the base station as a synchronization source base station.
  • the synchronization state further includes a synchronization level
  • the processor is further configured to:
  • the synchronization level of the synchronization source base station of the base station is determined according to the synchronization level of the base station, wherein the synchronization level of the base station is different from the synchronization level of the synchronization source base station of the base station by one.
  • the processor is further configured to:
  • the processor is further configured to:
  • the downlink signal of the cell where the base station is located is not transmitted;
  • the frequency position When receiving the synchronization reference signal for inter-station synchronization of the synchronization source base station of the base station The frequency position does not transmit the downlink signal of the cell where the base station is located.
  • the synchronization reference signal is a synchronization tracking reference signal.
  • the synchronization reference signal used for inter-station synchronization is located in a protection time slot in a special subframe; or, when the system in which the base station is located is an LTE system, the synchronization reference signal used for inter-station synchronization Located in the MBSFN subframe.
  • the synchronization reference signal of the base station and the synchronization reference signal for inter-station synchronization of the synchronization source base station of the base station are not at the same time, and the synchronization reference signal for inter-station synchronization can be received at the time corresponding to the synchronization source base station. And performing inter-station synchronization, and then sending synchronization reference signals at their own time for UE downlink synchronization or further for inter-station synchronization of other base stations, and implementing inter-station synchronization and UE downlink synchronization in one cycle, improving synchronization performance .
  • 1 is a synchronization state diagram of small base stations in an embodiment of the present invention
  • FIG. 2 is a schematic flow chart of an embodiment of a synchronization method according to the present invention.
  • FIG. 3 is a schematic diagram of a synchronization tracking reference signal configured by each small base station according to an embodiment of the present invention
  • FIG. 4 is a schematic diagram of another synchronization tracking reference signal configured by each small base station according to an embodiment of the present invention.
  • FIG. 5 is a schematic flowchart diagram of another embodiment of a synchronization method according to the present invention.
  • FIG. 6 is a schematic structural diagram of an embodiment of a base station according to the present invention.
  • FIG. 7 is a schematic structural diagram of another embodiment of a base station according to the present invention.
  • the technical solutions in the embodiments of the present invention are clearly and completely described in the following with reference to the accompanying drawings in the embodiments of the present invention.
  • the embodiments are a part of the embodiments of the invention, and not all of the embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present invention without departing from the inventive scope are the scope of the present invention.
  • FIG. 1 is a synchronization state diagram of small base stations according to an embodiment of the present invention.
  • a densely deployed group of small base stations needs to implement inter-station synchronization.
  • a small base station as a synchronization source is called a synchronization source (small base station)
  • a small base station that needs to be synchronized by a synchronization source small base station is a synchronized small base station, and some small base stations need to pass a synchronization source.
  • the small base station obtains synchronization and serves as a synchronization source for other small base stations, and such small base stations are also regarded as synchronization source small base stations.
  • the small base station may be an access point (AP), a micro base station (Micro), a pico base station (Pico), an indoor base station (Femto), a low mobility base station (Lomo Mobility, LoMo), and a low power transmitting node (Low Power).
  • AP access point
  • Micro micro base station
  • Pico pico base station
  • Femto indoor base station
  • LoMo low mobility base station
  • Low Power Low Power transmitting node
  • Node, LPN or Radio Remote Unit (RRU).
  • the synchronization level of the synchronization source small base station may be further defined, wherein the synchronization level of the synchronization source small base station obtained by the external synchronization source and synchronized for other small base stations in the small base station group is L-0, synchronizing with the L-0 synchronization source small base station and providing synchronization for other small base stations.
  • the synchronization level of the small base station is L-1, and so on, and the Ln synchronization source small base station is synchronized with each other.
  • the small base station provides a synchronized synchronization source small base station with a synchronization level of L-(n+l).
  • the external synchronization source may include: a Global Position System (GPS), a synchronization source provided by the IEEE 1588 mode, or an adjacent macro base station.
  • GPS Global Position System
  • the synchronization relationship between the small base stations 1 to 5 of FIG. 1 is: the small base station 0 can obtain synchronization through an external synchronization source (such as GPS); the small base station 1 and the small base station 2 obtain synchronization through the small base station 0; the small base station 3 passes The small base station 2 obtains synchronization; the small base station 4 obtains synchronization through the small base station 2; and the small base station 5 obtains synchronization through the small base station 3.
  • an external synchronization source such as GPS
  • the small base station 1 and the small base station 2 obtain synchronization through the small base station 0
  • the small base station 3 passes The small base station 2 obtains synchronization
  • the small base station 4 obtains synchronization through the small base station 2
  • the small base station 5 obtains synchronization through the small base station 3.
  • the small base stations 0 to 3 provide synchronization for other small base stations, these small base stations are all synchronous source small base stations and have respective synchronization levels.
  • the synchronization level of the small base station 0 is L-0, that is, the small base station 0 is L-0 synchronization source small base station; small base station 1 and small base station 2 have synchronization level L-1, both are L-1 synchronization source small base stations; small base station 3 has synchronization level L-2, which is L-2 synchronization source Small base station.
  • the small base station 4 and the small base station 5 do not provide synchronization for other small base stations, and are only synchronized from other small base stations. This is the synchronized small base station.
  • the synchronization source small base station is a synchronization source small base station of the small base station.
  • the small base station also provides downlink synchronization for UEs in its cell.
  • the small base station 1 needs to provide the UE of the cell in which it is located with a synchronization reference signal for downlink synchronization of the UE.
  • each small base station uses the same synchronization reference signal configuration, and the synchronization reference signal is used for both inter-station synchronization and UE downlink synchronization.
  • the period of the synchronization reference signal is 2 subframes
  • both the small base station 0 and the small base station 1 need to transmit the synchronization reference signal on the first, third, fifth, ..., that is, the small base station 1 needs to be in the first
  • the synchronization reference signal sent by the small base station 0 is received in a certain subframe of 1, 3, 5, ..., and the inter-station synchronization is completed according to the received synchronization reference signal, after which the small base station 1 needs to be in the first, third,
  • a synchronization reference signal is transmitted on a certain subframe of 5...
  • the small base station 1 Since the small base station 1 cannot receive and transmit at the same time, the synchronization reference signal received by the small base station 1 and the synchronization reference signal transmitted by the small base station 1 need to be separated by at least one synchronization reference signal period, for example, the small base station 1 is in the first subframe.
  • the synchronization reference signal transmitted by the small base station 0 is received. Since the small base station 1 cannot transmit at the same time, the small base station 1 transmits the synchronization reference signal for downlink synchronization of the UE at least in the third subframe. Therefore, when the period of the synchronization reference signal is long, both the inter-station synchronization and the UE downlink synchronization take a long time, which affects the synchronization performance.
  • the present invention gives the following embodiments to improve synchronization performance.
  • FIG. 2 is a schematic flowchart of an embodiment of a synchronization method according to the present invention, including:
  • the base station determines its own synchronization state, where the synchronization state includes: a synchronized base station, or a synchronization source base station;
  • the base station may be specifically a small base station, for example, AP, Micro, Pico, Femto, LoMo, LPN or RRU.
  • a small base station is taken as an example.
  • the base station configures the synchronization reference signal of the base station according to the synchronization state of the base station, so that the first time is different from the second time, the first time is the time at which the synchronization reference signal of the base station is located, and the second time The time is the time at which the synchronization reference signal for the inter-station synchronization of the synchronization source base station of the base station is located.
  • the synchronization reference signal may include a synchronously obtained reference signal and a synchronous tracking reference signal, and the reference signal is synchronously obtained for timing synchronization at the time of power-on, and the synchronous tracking reference signal is used for periodicity.
  • Synchronous tracking corrects synchronization deviations in time. Synchronously obtaining reference signals such as Primary Synchronous Signal (PSS) and Secondary Synchronous Signal (SSS) in a Long Term Evolution (LTE) system, and synchronizing tracking reference signals such as a common reference in an LTE system Signal (Common Reference Signal, CRS).
  • PSS Primary Synchronous Signal
  • SSS Secondary Synchronous Signal
  • LTE Long Term Evolution
  • CRS Common Reference Signal
  • the embodiment of the present invention takes the synchronous reference signal as a synchronous tracking reference signal as an example.
  • the foregoing time may refer to a time domain resource such as a subframe or a symbol.
  • a subframe is taken as an example.
  • the synchronization tracking reference signal sent by the small base station is used for at least the downlink synchronization of the UE of the cell where the small base station is located.
  • the synchronization tracking reference signal is further used to provide inter-station synchronization for the synchronized small base station of the small base station.
  • the synchronous tracking reference signal for UE downlink synchronization and the synchronous tracking reference signal for inter-station synchronization may be independent synchronous tracking reference signals, which may be referred to as UE downlink synchronization tracking reference signal and inter-station synchronization tracking reference signal, respectively. .
  • the same synchronization tracking reference signal may be used for both UE downlink synchronization and station synchronization. Described separately below.
  • Manner 1 The synchronous tracking reference signal is divided into a UE downlink synchronization tracking reference signal and an inter-station synchronization tracking reference signal.
  • the synchronization tracking reference signal sent by the synchronization source small base station includes the two types of synchronization tracking reference signals, and the synchronization tracking reference signal sent by the synchronous small base station only includes the UE downlink synchronization tracking reference signal.
  • the time domain density of the synchronization tracking reference signal configured by the synchronization source small base station is higher than the time domain density of the synchronization tracking reference signal configured by the synchronized small base station.
  • the UE downlink synchronization tracking reference signal and the inter-station synchronization tracking reference signal are configured and located in different subframes.
  • the specific configuration of the two synchronous tracking reference signals can be as follows:
  • the UE downlink synchronization tracking reference signal and the inter-station synchronization tracking reference signal have the same configuration, that is, the same sequence generation formula is configured, the same parameters are configured, and the same frequency domain resource mapping pattern is configured in the time domain interval; or
  • the configuration of the UE downlink synchronization tracking reference signal and the inter-station synchronization tracking reference signal is different, for example, configuring different sequence generation formulas, or configuring different parameters, or configuring different frequency domain resources in the time domain interval. Map pattern.
  • the parameters of the above configuration include, for example, sequence length, transmission power, and the like.
  • the time domain density of the UE downlink synchronization tracking reference signal and the time domain density of the inter-station synchronization tracking reference signal may be the same or different.
  • the synchronization source small base station Since the synchronization source small base station whose synchronization level is greater than L-0 needs to obtain timing synchronization from the synchronization source small base station (i.e., its synchronization source) of the upper stage, it also needs to provide downlink timing synchronization for the UEs in its cell.
  • the UE downlink synchronization tracking reference signal of the synchronization source small base station and the synchronization source small base station synchronization synchronization reference signal of the synchronization source small base station need to be different. On the sub-frame.
  • the inter-station synchronization tracking reference signal of the synchronization source small base station and the synchronization source small base station of the synchronization source small base station are synchronously tracked between stations.
  • the reference signal also needs to be on a different subframe.
  • the inter-station synchronization tracking reference signals of the two synchronization source small base stations are located on different subframes.
  • the synchronization level difference of the two synchronization source small base stations is greater than or equal to k, the inter-station synchronization tracking reference signals of the two synchronization source small base stations are located in different or the same subframe.
  • the synchronization tracking reference signals sent by the same may be located in the same subframe or different subframes.
  • the mutually orthogonal sequences may be used. Differentiate between different synchronization source small base stations, or use the same sequence to implement transmit diversity to improve synchronization performance.
  • the synchronized small base station Only the UE downlink synchronization tracking reference signal is configured.
  • the time domain density of the UE downlink synchronization tracking reference signal of the synchronized small base station may satisfy the UE downlink synchronization tracking accuracy requirement.
  • the time domain density of the UE downlink synchronization tracking reference signal of the synchronized small base station may be the same as the time domain density of the UE downlink synchronization tracking reference signal of the synchronization source small base station.
  • the configuration of the UE downlink synchronization tracking reference signal of the synchronization source small base station and the configuration of the UE downlink synchronization tracking reference signal of the synchronized small base station may follow the configuration of the existing synchronization tracking reference signal to achieve backward compatibility.
  • the existing synchronization tracking reference signals are transmitted on the first, third, fifth, ... subframes
  • the UE downlink synchronization tracking reference signal of the synchronization source small base station and the UE downlink synchronization tracking reference signal of the synchronized small base station are also Sent on the first, third, fifth... subframes.
  • FIG. 3 a schematic diagram of a synchronization tracking reference signal configured for each small base station.
  • the small base station 0, the small base station 1 and the small base station 3 are all synchronization source small base stations and have corresponding synchronization levels, and the small base station 5 is a synchronized small base station.
  • the synchronization source small base station that is, the small base station 0, the small base station 1 and the small base station 3
  • the synchronization tracking reference signal includes the UE downlink synchronization tracking reference signal and the inter-station synchronization tracking reference signal
  • the synchronized small base station That is, the synchronization tracking reference signal transmitted by the small base station 5 includes only the UE downlink synchronization tracking reference signal.
  • the UE downlink synchronization tracking reference signal and the inter-station synchronization tracking reference signal sent by each synchronization source small base station are located on different subframes from the synchronization synchronization source reference signal transmitted by the synchronization source small base station of the previous stage.
  • the UE downlink synchronization tracking reference signal of the small base station 1 and the inter-station synchronization tracking reference signal of the small base station 0 are located in different subframes
  • the tracking reference signal is also located on a different subframe.
  • the UE downlink synchronization tracking reference signal of the small base station 3 and/or the inter-station synchronization tracking reference signal and the inter-station synchronization of the small base station 0 may be located in the same subframe or on different subframes. The complexity of the system design can be reduced when located on the same sub-frame.
  • the present embodiment is compatible with the existing design, that is, the UE downlink synchronization tracking reference signal of each small base station can follow the existing design.
  • the UE downlink synchronization tracking reference of each small base station The signals are on the same subframe.
  • only the inter-station synchronization tracking reference signals of the adjacent synchronization source small base stations are required to be located in different subframes.
  • Manner 2 The synchronization tracking reference signal is used for both UE downlink synchronization and station synchronization.
  • the synchronous tracking reference signal will be used for the above two purposes.
  • the synchronization tracking reference signal of the small base station and its synchronization source in this embodiment needs to be located in different subframes.
  • the time domain density of the synchronization tracking reference signal configured by the synchronization source small base station is the same as the time domain density of the synchronization tracking reference signal configured by the synchronized small base station.
  • the minimum interval of the synchronization reference signal of the small base station and its synchronization source is smaller than the transmission period of the existing synchronous reference signal.
  • a threshold k (k>l) may be set, and when the synchronization level difference of the two synchronization source small base stations is less than k, the synchronization tracking reference signals of the two synchronization source small base stations are located at different On the subframe; when the synchronization level difference of the two synchronization source small base stations is greater than or equal to k, The synchronization tracking reference signals of the two synchronization source small base stations are located on different or identical subframes.
  • the synchronization tracking reference signals sent by the same may be located in the same subframe or different subframes.
  • the mutually orthogonal sequences may be used. Differentiate between different synchronization source small base stations, or use the same sequence to implement transmit diversity to improve synchronization performance.
  • the small base station can transmit the downlink synchronization tracking reference signal of the UE of the local cell and receive the synchronization of the upper level at different times.
  • the synchronization tracking reference signal sent by the source small base station completes the UE timing synchronization and the inter-station timing synchronization, respectively.
  • each small base station is configured with a synchronization tracking reference signal, and the contents of the synchronization tracking reference signals may be the same, and each small base station and its synchronization source small base station synchronization tracking reference signal are located in different subframes.
  • the synchronization tracking reference signal of the small base station 1 and the synchronization tracking reference signal of the small base station 0 are located in different subframes
  • the synchronization tracking reference signal of the small base station 3 and the synchronization tracking reference signal of the small base station 1 are located in different subframes
  • the small base station The synchronization tracking reference signal of 5 is located in a different subframe from the synchronization tracking reference signal of the small base station 3.
  • the synchronization tracking reference signal may be located in the same subframe.
  • the small base station 5 in FIG. 4 and the synchronization tracking reference signal of the small base station 0 are located in the same subframe to reduce System complexity.
  • the foregoing method 1 distinguishes the synchronous tracking reference signal.
  • the UE downlink synchronization tracking reference signal can follow the existing design and support subsequent compatibility; the second method does not distinguish the synchronous tracking reference signal, and can reduce the reference signal overhead.
  • the small base station does not send the downlink signal of the cell where the small base station is located at the time of receiving the synchronization reference signal for the inter-station synchronization of the synchronization source small base station of the small base station; or, the small base station is receiving the small
  • the time-frequency position of the synchronization reference signal used for inter-station synchronization of the synchronization source small base station of the base station does not transmit the downlink signal of the cell where the small base station is located.
  • the small base station 1 does not transmit the downlink signal of the cell where the small base station 1 is located in the subframe (or the time-frequency position) where the tracking reference signal is located between the stations of the small base station 0.
  • the reference signal for inter-station synchronization may be transmitted at a specific time.
  • the reference signal used for inter-station synchronization may be located in a guard slot (GP) for uplink and downlink handover in a special subframe, due to this part.
  • GP guard slot
  • the small base stations of the different synchronization levels may transmit inter-station synchronization reference signals in GPs of different special subframes, or transmit inter-station synchronization reference signals at different times within the GP of the same special subframe.
  • the reference signal for inter-station synchronization may also be located in a downlink subframe configured as a Multi-Broadcast Single Frequency Network (MBSFN), and there may be no between the base station and the UE in the MBSFN subframe.
  • MBSFN Multi-Broadcast Single Frequency Network
  • the small base stations of different synchronization levels may synchronize reference signals between different MBSFN subframe transmission stations, or transmit inter-station synchronization reference signals at different times within the same MBSFN subframe.
  • the transmission subframe position of the inter-station synchronization reference signal in the LTE system is set, and the configuration method in which the small base station transmits the inter-station synchronization reference signal on these subframes is as described above.
  • the synchronization reference signal of the small base station and the synchronization reference signal for inter-station synchronization of the synchronization source of the small base station are not in the same subframe, and the synchronization for inter-station synchronization may be received in the subframe corresponding to the synchronization source.
  • the reference signal is used for inter-station synchronization, and then the synchronization reference signal can be transmitted in its own subframe for UE downlink synchronization or further used for inter-station synchronization of other small base stations, and inter-station synchronization and UE downlink synchronization can be realized in one cycle. , improve synchronization performance.
  • FIG. 5 is a schematic flowchart of another embodiment of a synchronization method according to the present invention, including:
  • the small base station is powered on, determines its synchronization source, and obtains the initial timing synchronization.
  • the small base station When the small base station has an external timing synchronization obtaining function such as a GPS or a macro base station, the small base station obtains initial timing synchronization from the external synchronization source.
  • an external timing synchronization obtaining function such as a GPS or a macro base station
  • the small base station When the small base station does not have the external timing synchronization obtaining function, the synchronous receiving reference signal sent by the surrounding small base station is received, and the reference signal with the strongest receiving power is obtained through the correlation detection, and the reference signal is obtained according to the synchronization with the strongest receiving power.
  • An initial timing synchronization is obtained, and a small base station that transmits the synchronization to obtain a reference signal is determined as a synchronization source.
  • the small base station that obtains the initial timing synchronization can send a notification signaling to the small base station whose synchronization source is used, and the notification signaling is used to notify the small base station that has passed the synchronization source to obtain timing synchronization.
  • the small base station determines its own synchronization state and configures a corresponding synchronization tracking reference signal. If the small base station receives the notification signaling sent by the remaining small base stations, it can determine that it is the synchronization source small base station, and can determine its own synchronization level as follows:
  • Level is L-0;
  • the small base station When the small base station obtains the initial timing synchronization from the remaining small base stations, it can first know the synchronization level of the synchronization source small base station of the previous stage, and then add 1 as its own synchronization level based on the synchronization level. For example, after the small base station obtains initial timing synchronization from the synchronization source small base station of L-0, the synchronization level of the small base station is L-1.
  • the small base station If the small base station does not receive the notification signaling sent by the remaining small base stations, it can determine that it is the synchronized small base station.
  • the synchronization tracking reference signal After determining its own synchronization status, the synchronization tracking reference signal can be configured as shown in Figure 3 or Figure 4.
  • the small base station may perform itself according to the configuration of the synchronization source small base station of the previous stage, that is, the synchronization tracking reference signal of the synchronization source thereof.
  • the synchronization tracking reference signal of the synchronization tracking reference signal is configured to be in a different subframe, and when the small base station is the synchronization source small base station, the synchronization tracking reference signal of the self includes its own
  • the UE synchronizes the tracking reference signal with its own inter-station synchronization tracking reference signal; when the small base station is the synchronized small base station, the own synchronization tracking reference signal includes its own UE synchronization tracking reference signal.
  • the synchronization tracking reference signal of the configuration small base station and the synchronization tracking reference signal of the synchronization source are located in different subframes.
  • the synchronization source small base station of the small base station may notify the small base station of the synchronization level of the synchronization source small base station by using the first signaling, so that the small base station determines its own synchronization level;
  • the synchronization source small base station can also perform the configuration of the synchronization tracking signal of the upper-level synchronization source small base station to the small base station by using the second signaling, so that the small base station completes its own configuration.
  • the first signaling and the second signaling may be two signalings, or may belong to the same signaling.
  • the correspondence between the synchronization level and the synchronization tracking reference signal configuration may be pre-configured.
  • the synchronization source small base station may not send the configuration of the synchronization tracking reference signal to the small base station, but by the small base station.
  • the configuration of the synchronization tracking reference signal is determined according to the correspondence between the implicit synchronization level and the synchronization tracking reference signal.
  • the small base station receives the inter-station synchronization tracking reference signal sent by the synchronization source according to the configuration of the synchronization tracking reference signal of the synchronization source, and performs synchronization tracking between stations; and according to its own synchronization tracking reference The configuration of the signal, sending its own synchronous tracking reference signal.
  • the synchronization tracking reference signal of the small base station includes: a downlink synchronization tracking reference signal of the UE of the small base station, and is used for downlink synchronization tracking of the UE in the cell.
  • the synchronization tracking reference signal of the UE includes: a downlink synchronization tracking reference signal of the small base station, used for downlink synchronization tracking of the UE; and an inter-station synchronization of the small base station Tracking reference signals for inter-station synchronization of the remaining small base stations.
  • the synchronization status of the small base station can be updated, and then 52 ⁇ 53 can be repeatedly executed.
  • the updated content may include at least one of the following items:
  • Synchronization source reselection The small base station can periodically re-detect the synchronization acquisition reference signal sent by the surrounding small base station. If a synchronization source with better quality than the current synchronization source signal is detected, the synchronization source can be switched to the new small base station. If the small base station itself is also a synchronization source small base station of other small base stations, it is also possible to update its own synchronization level according to the synchronization level of the new synchronization source and send a signaling to inform the small base station to update the synchronization level through which synchronization is obtained.
  • Synchronous relationship translation When a small base station performs synchronization source reselection or enters a silent state without a service user, the small base station can send signaling to the original synchronization source to release the synchronization relationship with it.
  • Synchronization source small base station and synchronized small base station state transition When the small base station that is the synchronization source d and the base station finds that the small base station through which synchronization is obtained is synchronized with the release, the state of the synchronization source small base station is transferred to the Synchronizing the small base station state; when the small base station that is the synchronized small base station receives the notification signaling sent by the other small base station through which the synchronization is obtained, the state is shifted from the synchronized small base station state to the synchronous source small base station state. After the synchronization state of the small base station is changed, the configuration of the synchronization tracking reference signal also changes accordingly.
  • the signaling interaction between the small base station and its synchronization source may be as follows: an X2 interface between the base stations, an air interface between the base stations, or an upper layer centralized controller.
  • small base stations that provide synchronization and synchronization may belong to the same carrier or to different operators.
  • the small base station is configured differently from the synchronization source, so that the synchronization is prevented from being too long, and the inter-station synchronization performance between the UE and the small base station is ensured.
  • the synchronization reference signal can be configured to use the same subframe, which can reduce resource overhead and reduce network power consumption; by distinguishing between UE downlink synchronization tracking reference signal and station The reference signal is synchronously tracked, and the downlink synchronization tracking reference signal of the UE is kept unchanged, which can be compatible with the existing system.
  • the resource overhead can be reduced.
  • FIG. 6 is a schematic structural diagram of an embodiment of a base station according to the present invention.
  • the base station may be a small base station, and the base station 60 includes a determining module 61 and a configuration module 62.
  • the determining module 61 is configured to determine a synchronization status of the base station, where the synchronization status includes: a synchronization base station, or a synchronization source base station;
  • the configuration module 62 is configured to configure the synchronization reference signal of the base station according to its own synchronization state, so that the first time is different from the second time, and the first time is a synchronization reference of the base station
  • the time at which the signal is located, the second time is the time at which the synchronization reference signal for the inter-station synchronization of the synchronization source base station of the base station is located.
  • the configuration module is specifically configured to:
  • the synchronization reference signal configured by the base station includes a UE downlink synchronization reference signal of the base station and an inter-station synchronization reference signal of the base station at different times, and the UE downlink of the base station is downlink.
  • the synchronization reference signal is located at a different time from the inter-station synchronization reference signal of the synchronization source base station of the base station, and the inter-station synchronization reference signal of the base station is located at a different time from the inter-station synchronization reference signal of the synchronization source base station of the base station.
  • the synchronization reference signal configured by the base station includes a UE downlink synchronization reference signal of the base station, and the UE downlink synchronization reference signal of the base station and the synchronization source base station of the base station The synchronization reference signal is at a different time;
  • the inter-station synchronization reference signal of the synchronization source base station of the base station is a synchronization reference signal for inter-station synchronization in the synchronization reference signal of the synchronization source base station of the base station.
  • the synchronization reference signal of the synchronization source base station of the base station further includes a UE downlink synchronization reference signal of the synchronization source base station of the base station, where the configuration module is further configured to:
  • the UE downlink synchronization reference signal of the base station is configured to be located at the same time as the UE downlink synchronization reference signal of the synchronization source base station of the base station.
  • the following parameters of the UE downlink synchronization reference signal and the inter-station synchronization reference signal are the same or at least one different:
  • Sequence generation formula sequence length, transmit power, frequency domain resource mapping pattern.
  • the configuration module is specifically configured to:
  • the synchronization reference signal of the base station is configured to be at a different time from the synchronization reference signal of the synchronization source base station of the base station, where the synchronization reference signal is used for downlink synchronization of the UE and synchronization between stations.
  • the configuration module is further configured to:
  • the synchronization reference signal configured to the base station is located differently from the synchronization reference signal of the other base station.
  • the synchronization reference signal of the base station is configured to be at the same time as the synchronization reference signal of the another base station.
  • the synchronization reference signal of the base station is configured to be at the same time or different timing as the synchronization reference signal of the another base station.
  • the configuration module is further configured to:
  • the synchronization reference signal of the base station is configured to use the same sequence as the synchronization reference signal of the other base station.
  • the determining module is specifically configured to:
  • the base station After the base station receives the notification signaling sent by the other base station, it determines that it is the synchronization source base station; when the base station does not receive the notification signaling sent by the other base station, it determines that it is the synchronized base station;
  • the other base station is a base station that uses the base station as a synchronization source base station.
  • the synchronization state further includes a synchronization level
  • the determining module is further configured to: when the base station is a synchronization source base station, determine a synchronization level of the base station according to a synchronization level of the synchronization source base station, where The synchronization level of the base station is different from the synchronization level of the synchronization source base station of the base station by one.
  • the base station further includes:
  • An update module configured to periodically detect synchronization to obtain a reference signal, and obtain a reference signal to reselect the synchronization source base station of the base station according to the detected synchronization; or, after reselecting the synchronization source base station, send the synchronization source base station before reselection Or signaling for decoding the synchronization relationship; or, after detecting the synchronization relationship of the synchronization relationship as the synchronization source base station, transferring the synchronization state from the synchronization source base station to the synchronized base station; or the base station is acting as Received notifications from other base stations after being synchronized by the base station After the signaling, the self-synchronization state is transferred from the synchronized base station to the synchronization source base station, and the other base station is the base station that uses the base station as the synchronization source base station.
  • the configuration module is further configured to:
  • the downlink signal of the cell where the base station is located is not transmitted;
  • the downlink signal of the cell where the base station is located is not transmitted at the time-frequency position where the synchronization reference signal for inter-station synchronization of the synchronization source base station of the base station is located.
  • the synchronization reference signal is a synchronization tracking reference signal.
  • the synchronization reference signal used for inter-station synchronization is located in a protection time slot in a special subframe; or, when the system where the base station is located is LTE In the system, the synchronization reference signal for inter-station synchronization is located in the MBSFN subframe.
  • the synchronization reference signal of the base station and the synchronization reference signal for inter-station synchronization of the synchronization source base station of the base station are not at the same time, and the synchronization reference signal for inter-station synchronization may be received at a timing corresponding to the synchronization source base station. And performing inter-station synchronization, and then sending synchronization reference signals at their own time for UE downlink synchronization or further for inter-station synchronization of other base stations, and implementing inter-station synchronization and UE downlink synchronization in one cycle, improving synchronization performance .
  • FIG. 7 is a schematic structural diagram of another embodiment of a base station according to the present invention.
  • the base station may be a small base station, and the base station 70 includes a transmitting circuit 702, a receiving circuit 703, a power controller 704, a processor 705, a memory 706, and an antenna 701.
  • the processor 705 controls the operation of the device 70, which may also be referred to as a CPU.
  • Memory 706 can include read only memory and random access memory and provides instructions and data to processor 705.
  • a portion of memory 706 may also include non-volatile row random access memory (NVRAM).
  • NVRAM non-volatile row random access memory
  • the base station 70 may be embedded or may itself be a small base station, and may further include a carrier accommodating the transmitting circuit 702 and the receiving circuit 703 to allow data transmission and reception between the base station 70 and the remote device. It is possible that base station 70 is also a simple schematic of a network or wireless device. Transmitting circuit 702 and receiving circuit 703 can be coupled to antenna 701.
  • the various components of base station 70 are coupled together by a bus system 7100, which in addition to the data bus includes a power bus, a control bus, and a status signal bus. However, for the sake of clarity, various buses are labeled as bus system 7100 in the figure.
  • Base station 70 can also include a power controller 704.
  • Processor 705 may be an integrated circuit chip with signal processing capabilities. In the implementation process, each step of the above method may be completed by an integrated logic circuit of hardware in the processor 705 or an instruction in a form of software.
  • the foregoing processor may be a general-purpose processor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), an off-the-shelf programmable gate array (FPGA), or other programmable logic device. , discrete gate or transistor logic steps and logic block diagrams.
  • the general purpose processor may be a microprocessor or the processor or any conventional processor, decoder or the like.
  • the steps of the method disclosed in the embodiment of the present invention may be directly implemented as a hardware decoding processor, or may be performed by a combination of hardware and software modules in the decoding processor.
  • the software modules can be located in a conventional storage medium such as random access memory, flash memory, read only memory, programmable read only memory or electrically erasable programmable memory, registers, and the like.
  • the storage medium is located in the memory 706.
  • the processor 705 reads the information in the memory 706 and completes the steps of the above method in combination with hardware.
  • the base station may include: a processor, configured to determine a synchronization status of the base station, where the synchronization status includes: a synchronized base station, or a synchronization source base station; and configuring a synchronization reference signal of the base station according to a synchronization state of the base station.
  • the first time is different from the second time, the first time is a time at which the synchronization reference signal of the base station is located, and the second time is a synchronization reference for the synchronization source base station of the base station for inter-station synchronization The moment the signal is located.
  • the processor is specifically configured to:
  • the synchronization reference signal configured by the base station includes a UE downlink synchronization reference signal of the base station and an inter-station synchronization reference signal of the base station at different times, and the UE downlink of the base station is downlink.
  • the synchronization reference signal is located at a different time from the inter-station synchronization reference signal of the synchronization source base station of the base station, and the inter-station synchronization reference signal of the base station is located at a different time from the inter-station synchronization reference signal of the synchronization source base station of the base station.
  • the synchronization reference signal configured by the base station includes a UE downlink synchronization reference signal of the base station, and the UE downlink synchronization reference signal of the base station and the synchronization source base station of the base station The synchronization reference signal is at a different time;
  • the inter-station synchronization reference signal of the synchronization source base station of the base station is a synchronization reference signal for inter-station synchronization in the synchronization reference signal of the synchronization source base station of the base station.
  • the synchronization reference signal of the synchronization source base station of the base station further includes the same a UE downlink synchronization reference signal of the source base station, where the processor is further configured to:
  • the UE downlink synchronization reference signal of the base station is configured to be located at the same time as the UE downlink synchronization reference signal of the synchronization source base station of the base station.
  • the following parameters of the UE downlink synchronization reference signal and the inter-station synchronization reference signal are the same or at least one different:
  • Sequence generation formula sequence length, transmit power, frequency domain resource mapping pattern.
  • the processor is specifically configured to:
  • the synchronization reference signal of the base station is configured to be at a different time from the synchronization reference signal of the synchronization source base station of the base station, and the synchronization reference signal is used for UE downlink synchronization and inter-station synchronization.
  • the processor is further configured to:
  • the synchronization reference signal configured to the base station is located differently from the synchronization reference signal of the other base station.
  • the synchronization reference signal of the base station is configured to be at the same time as the synchronization reference signal of the another base station.
  • the synchronization reference signal of the base station is configured to be at the same time or different timing as the synchronization reference signal of the another base station.
  • the processor is further configured to:
  • the synchronization reference signal of the base station is configured to use the same sequence as the synchronization reference signal of the other base station.
  • the base station further includes:
  • a transceiver configured to receive notification signaling sent by other base stations
  • the processor is specifically configured to: after the transceiver receives the notification signaling sent by the other base station, determine that it is the synchronization source base station; or, after the transceiver does not receive the notification signaling sent by the other base station, determine It is itself a synchronized base station;
  • the other base station is a base station that uses the base station as a synchronization source base station.
  • the synchronization state further includes a synchronization level
  • the processor is further configured to: when the base station is a synchronization source base station, determine a synchronization level of the base station according to a synchronization level of the synchronization source base station, where The synchronization level of the base station is different from the synchronization level of the synchronization source base station of the base station by one.
  • the processor is further configured to:
  • the processor is further configured to: when receiving a synchronization reference signal for inter-station synchronization of the synchronization source base station of the base station, not transmitting a downlink signal of a cell where the base station is located; or receiving The time-frequency position of the synchronization reference signal used by the synchronization source base station of the base station for the inter-station synchronization does not transmit the downlink signal of the cell where the base station is located.
  • the synchronization reference signal is a synchronization tracking reference signal.
  • the synchronization reference signal used for inter-station synchronization is located in a protection time slot in a special subframe; or, when the system where the base station is located is LTE In the system, the synchronization reference signal for inter-station synchronization is located in the MBSFN subframe.
  • the synchronization reference signal of the base station and the synchronization reference signal for inter-station synchronization of the synchronization source base station of the base station are not at the same time, and the synchronization reference signal for inter-station synchronization may be received at a timing corresponding to the synchronization source base station. And performing inter-station synchronization, and then sending synchronization reference signals at their own time for UE downlink synchronization or further for inter-station synchronization of other base stations, and implementing inter-station synchronization and UE downlink synchronization in one cycle, improving synchronization performance .
  • the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, may be located in one place, or may be distributed to multiple network units. Some or all of the units may be selected according to actual needs to achieve the objectives of the solution of the embodiment.
  • each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.
  • the above integrated unit can be implemented in the form of hardware or in the form of a software function unit.
  • the integrated unit if implemented in the form of a software functional unit and sold or used as a standalone product, may be stored in a computer readable storage medium.
  • the instructions include a plurality of instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) or a processor to perform all or part of the steps of the methods described in various embodiments of the present application.
  • the foregoing storage medium includes: a U disk, a removable hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk, and the like, which can store program code. .

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Abstract

本发明提供一种同步方法和基站,该方法包括基站确定自身的同步状态,所述同步状态包括:被同步基站,或者,同步源基站;所述基站根据自身的同步状态配置所述基站的同步参考信号,使得第一时刻与第二时刻不同,所述第一时刻为所述基站的同步参考信号所在的时刻,所述第二时刻为所述基站的同步源基站的用于站间同步的同步参考信号所在的时刻。本发明实施例可以提高同步性能。

Description

同步方法和基站
技术领域 本发明涉及通信技术, 尤其涉及一种同步方法和基站。 背景技术
为了满足移动数据业务的流量需求 ,可以在传统宏基站蜂窝网络基础上 , 在一些室内或室外热点地区密集部署小小区(small cell )。 小小区的特点是覆 盖范围小, 发射功率低, 适合于提供高速率的数据传输服务, 对宏蜂窝网络 进行数据分流, 减少运营商的布网成本。 小小区的形态可以包括: 多载波小 区 (Metro cell ), 微小区 (Micro cell ), 微微小区 (Pico cell ), 毫微微蜂窝小 区 (Femto cell )或使用无线互联 ( wireless fidelity, wifi )技术的无线局 i或网 ( Wireless Local Area Network, WLAN )等, 可以将不同小小区形态所釆用 的无线网络接入节点统称为小基站。
为了正常传输数据, 小基站间需要同步, 同时, 小基站还要为其小区内 的用户设备(User Equipment, UE )提供下行同步。 现有技术中, 小基站釆 用相同的配置发送同步参考信号以实现站间同步和 UE下行同步, 由于小基 站不能同时同频发送和接收, 因此, 小基站接收其它小基站发送的用于站间 同步的同步参考信号和该小基站发送给其小区内的 UE的用于 UE下行同步的 同步参考信号至少需要间隔一个同步参考信号的发送周期, 当该周期较长时, 要实现站间同步和 UE下行同步就需要较长的时间, 无疑会对定时同步性能 造成影响。 发明内容
有鉴于此, 本发明实施例提供了一种同步方法和基站, 用以解决现有技 术中存在的同步性能较差的问题。
第一方面, 提供了一种同步方法, 包括:
基站确定自身的同步状态, 所述同步状态包括: 被同步基站, 或者, 同 步源基站; 所述基站根据自身的同步状态配置所述基站的同步参考信号, 使得第一 时刻与第二时刻不同,所述第 -时刻为所述基站的同步参考信号所在的时刻 , 所述第二时刻为所述基站的同步源基站的用于站间同步的同步参考信号所在 的时刻。
结合第一方面, 在第一方面的第一种可能的实现方式中, 所述配置所述 基站的同步参考信号, 包括:
当所述基站为同步源基站时, 配置所述基站的同步参考信号包括位于不 同时刻的所述基站的用户设备 UE下行同步参考信号和所述基站的站间同步 参考信号, 且所述基站的 UE下行同步参考信号与所述基站的同步源基站的 站间同步参考信号位于不同的时刻, 以及所述基站的站间同步参考信号与所 述基站的同步源基站的站间同步参考信号位于不同的时刻;
当所述基站为被同步基站时, 配置所述基站的同步参考信号包括所述基 站的 UE下行同步参考信号,且所述基站的 UE下行同步参考信号与所述基站 的同步源基站的站间同步参考信号位于不同的时刻;
所述基站的同步源基站的站间同步参考信号为所述基站的同步源基站的 同步参考信号中用于站间同步的同步参考信号。
结合第一方面的第一种可能的实现方式, 在第一方面的第二种可能的实 现方式中, 所述基站的同步源基站的同步参考信号中还包括所述基站的同步 源基站的 UE下行同步参考信号, 所述配置所述基站的同步参考信号, 还包 括:
配置所述基站的 UE 下行同步参考信号与所述基站的同步源基站的 UE 下行同步参考信号位于相同的时刻。
结合第一方面的第一种或第二种可能的实现方式, 在第一方面的第三种 可能的实现方式中, 所述 UE下行同步参考信号与所述站间同步参考信号的 如下参数项均相同或至少有一项不同:
序列生成公式、 序列长度、 发射功率、 频域资源映射图案。
结合第一方面, 在第一方面的第四种可能的实现方式中, 所述配置所述 基站的同步参考信号, 包括:
配置所述基站的同步参考信号与所述基站的同步源基站的同步参考信号 位于不同的时刻, 所述同步参考信号用于 UE下行同步以及站间同步。 结合第一方面的第一种至第四种任一种可能的实现方式, 在第一方面的 第五种可能的实现方式中, 所述同步状态还包括同步等级, 所述配置所述基 站的同步参考信号, 还包括:
当所述基站的同步等级与另一基站的同步等级不相同且差值小于预设的 大于 1 的阈值时, 配置所述基站的同步参考信号与所述另一基站的同步参考 信号位于不同的时刻; 或者,
当所述基站的同步等级与另一基站的同步等级的差值大于或等于预设的 大于 1 阈值时, 配置所述基站的同步参考信号与所述另一基站的同步参考信 号位于相同的时刻; 或者,
当所述基站的同步等级与另一基站的同步等级相同时, 配置所述基站的 同步参考信号与所述另一基站的同步参考信号位于相同或不同的时刻。
结合第一方面的第五种可能的实现方式, 在第一方面的第六种可能的实 现方式中, 当所述基站的同步参考信号与同步等级相同的另一基站的同步参 考信号位于相同的时刻时, 所述配置所述基站的同步参考信号, 还包括: 配置所述基站的同步参考信号与所述另一基站的同步参考信号釆用相互 正交的序列; 或者,
配置所述基站的同步参考信号与所述另一基站的同步参考信号釆用相同 的序列。
结合第一方面或第一方面的第一种至第四种任一种可能的实现方式, 在 第一方面的第七种可能的实现方式中, 所述基站确定自身的同步状态, 包括: 当所述基站接收到其它基站发送的通知信令后,确定自身为同步源基站; 当所述基站没有接收到其它基站发送的通知信令时, 确定自身为被同步 基站; 所述其它基站为将所述基站作为同步源基站的基站。
结合第一方面的第七种可能的实现方式, 在第一方面的第八种可能的实 现方式中, 所述同步状态还包括同步等级, 所述基站确定自身的同步状态, 还包括:
当所述基站为同步源基站时, 根据所述基站的同步源基站的同步等级确 定自身的同步等级, 其中, 所述基站的同步等级与所述基站的同步源基站的 同步等级相差 1。
结合第一方面或第一方面的第一种至第八种任一种可能的实现方式, 在 第一方面的第九种可能的实现方式中, 还包括:
所述基站定期检测同步获得参考信号 , 并根据检测到的同步获得参考信 号重选所述基站的同步源基站; 或者,
所述基站在重选同步源基站后, 向重选前的同步源基站发送用于译放同 步关系的信令; 或者,
所述基站在作为同步源基站后检测到自身的同步关系全部译放后, 将自 身同步状态由同步源基站转移为被同步基站; 或者, 所述基站在作为被同步 基站后接收到其它基站发送的通知信令后, 将自身同步状态由被同步基站转 移为同步源基站, 所述其它基站为将所述基站作为同步源基站的基站。
结合第一方面或第一方面的第一种至第九种任一种可能的实现方式, 在 第一方面的第十种可能的实现方式中, 所述基站在接收所述基站的同步源基 站的用于站间同步的同步参考信号所在的时刻, 不发送所述基站所在小区的 下行信号; 或者,
所述基站在接收所述基站的同步源基站的用于站间同步的同步参考信号 所在的时频位置, 不发送所述基站所在小区的下行信号。
结合第一方面或第一方面的第一种至第十种任一种可能的实现方式, 在 第一方面的第十一种可能的实现方式中, 所述同步参考信号为同步跟踪参考 信号。
结合第一方面或第一方面的第一种至第十一种任一种可能的实现方式, 在第一方面的第十二种可能的实现方式中, 当所述基站所在的系统为 LTE TDD系统时, 所述用于站间同步的同步参考信号位于特殊子帧内的保护时隙 内; 或者, 当所述基站所在的系统为 LTE系统时, 所述用于站间同步的同步 参考信号位于 MBSFN子帧内。
第二方面, 提供了一种基站, 包括:
确定模块, 用于确定自身的同步状态, 所述同步状态包括: 被同步基站, 或者, 同步源基站;
配置模块, 用于根据自身的同步状态配置所述基站的同步参考信号, 使 得第一时刻与第二时刻不同, 所述第一时刻为所述基站的同步参考信号所在 的时刻, 所述第二时刻为所述基站的同步源基站的用于站间同步的同步参考 信号所在的时刻。 结合第二方面, 在第二方面的第一种可能的实现方式中, 所述配置模块 具体用于:
当所述基站为同步源基站时, 配置所述基站的同步参考信号包括位于不 同时刻的所述基站的用户设备 UE下行同步参考信号和所述基站的站间同步 参考信号, 且所述基站的 UE下行同步参考信号与所述基站的同步源的站间 同步参考信号位于不同的时刻, 以及所述基站的站间同步参考信号与所述基 站的同步源的站间同步参考信号位于不同的时刻;
当所述基站为被同步基站时, 配置所述基站的同步参考信号包括所述基 站的 UE下行同步参考信号,且所述基站的 UE下行同步参考信号与所述基站 的同步源的站间同步参考信号位于不同的时刻;
所述基站的同步源的站间同步参考信号为所述基站的同步源的同步参考 信号中用于站间同步的同步参考信号。
结合第二方面的第一种可能的实现方式, 在第二方面的第二种可能的实 现方式中, 所述基站的同步源的同步参考信号中还包括所述基站的同步源的 UE下行同步参考信号, 所述配置模块还用于:
配置所述基站的 UE 下行同步参考信号与所述基站的同步源基站的 UE 下行同步参考信号位于相同的时刻。
结合第二方面的第一种或第二种可能的实现方式, 在第二方面的第三种 可能的实现方式中, 所述 UE下行同步参考信号与所述站间同步参考信号的 如下参数项均相同或至少有一项不同:
序列生成公式、 序列长度、 发射功率、 频域资源映射图案。
结合第二方面, 在第二方面的第四种可能的实现方式中, 所述配置模块 具体用于:
配置所述基站的同步参考信号与所述基站的同步源基站的同步参考信号 位于不同的时刻, 所述同步参考信号用于 UE下行同步以及站间同步。
结合第二方面的第一种至第四种任一种可能的实现方式, 在第二方面的 第五种可能的实现方式中, 所述配置模块还用于:
当所述基站的同步等级与另一基站的同步等级不相同且差值小于预设的 大于 1 的阈值时, 配置所述基站的同步参考信号与所述另一基站的同步参考 信号位于不同的时刻; 或者, 当所述基站的同步等级与另一基站的同步等级的差值大于或等于预设的 大于 1 阈值时, 配置所述基站的同步参考信号与所述另一基站的同步参考信 号位于相同的时刻; 或者,
当所述基站的同步等级与另一基站的同步等级相同时, 配置所述基站的 同步参考信号与所述另一基站的同步参考信号位于相同或不同的时刻。
结合第二方面的第五种可能的实现方式, 在第二方面的第六种可能的实 现方式中, 当所述基站的同步参考信号与同步等级相同的另一基站的同步参 考信号位于相同的时刻时, 所述配置模块还用于:
配置所述基站的同步参考信号与所述另一基站的同步参考信号釆用相互 正交的序列; 或者,
配置所述基站的同步参考信号与所述另一基站的同步参考信号釆用相同 的序列。
结合第二方面或第二方面的第一种至第四种任一种可能的实现方式, 在 第二方面的第七种可能的实现方式中, 所述确定模块具体用于:
当所述基站接收到其它基站发送的通知信令后,确定自身为同步源基站; 当所述基站没有接收到其它基站发送的通知信令时, 确定自身为被同步 基站;
所述其它基站为将所述基站作为同步源基站的基站。
结合第二方面的第七种可能的实现方式, 在第二方面的第八种可能的实 现方式中, 所述同步状态还包括同步等级, 所述确定模块还用于:
当所述基站为同步源基站时, 根据所述基站的同步源基站的同步等级确 定自身的同步等级, 其中, 所述基站的同步等级与所述基站的同步源基站的 同步等级相差 1。
结合第二方面或第二方面的第一种至第八种任一种可能的实现方式, 在 第二方面的第九种可能的实现方式中, 还包括:
更新模块, 用于定期检测同步获得参考信号, 并根据检测到的同步获得 参考信号重选所述基站的同步源基站; 或者, 在重选同步源基站后, 向重选 前的同步源基站发送用于译放同步关系的信令; 或者, 在作为同步源基站后 检测到自身的同步关系全部译放后, 将自身同步状态由同步源基站转移为被 同步基站; 或者, 所述基站在作为被同步基站后接收到其它基站发送的通知 信令后, 将自身同步状态由被同步基站转移为同步源基站, 所述其它基站为 将所述基站作为同步源基站的基站。
结合第二方面或第二方面的第一种至第九种任一种可能的实现方式, 在 第二方面的第十种可能的实现方式中, 所述配置模块还用于:
在接收所述基站的同步源基站的用于站间同步的同步参考信号所在的时 刻, 不发送所述基站所在小区的下行信号; 或者,
在接收所述基站的同步源基站的用于站间同步的同步参考信号所在的时 频位置, 不发送所述基站所在小区的下行信号。
结合第二方面或第二方面的第一种至第十种任一种可能的实现方式, 在 第二方面的第十一种可能的实现方式中, 所述同步参考信号为同步跟踪参考 信号。
结合第二方面或第二方面的第一种至第十一种任一种可能的实现方式, 在第二方面的第十二种可能的实现方式中, 当所述基站所在的系统为 LTE TDD系统时, 所述用于站间同步的同步参考信号位于特殊子帧内的保护时隙 内; 或者, 当所述基站所在的系统为 LTE系统时, 所述用于站间同步的同步 参考信号位于 MBSFN子帧内。
第三方面, 提供了一种基站, 包括:
处理器, 用于确定自身的同步状态, 所述同步状态包括: 被同步基站, 或者, 同步源基站以及同步等级; 以及, 根据自身的同步状态配置所述基站 的同步参考信号, 使得第一时刻与第二时刻不同, 所述第一时刻为所述基站 的同步参考信号所在的时刻, 所述第二时刻为所述基站的同步源基站的用于 站间同步的同步参考信号所在的时刻。
结合第三方面, 在第三方面的第一种可能的实现方式中, 所述处理器具 体用于:
当所述基站为同步源基站时, 配置所述基站的同步参考信号包括位于不 同时刻的所述基站的用户设备 UE下行同步参考信号和所述基站的站间同步 参考信号, 且所述基站的 UE下行同步参考信号与所述基站的同步源基站的 站间同步参考信号位于不同的时刻, 以及所述基站的站间同步参考信号与所 述基站的同步源基站的站间同步参考信号位于不同的时刻;
当所述基站为被同步基站时, 配置所述基站的同步参考信号包括所述基 站的 UE下行同步参考信号,且所述基站的 UE下行同步参考信号与所述基站 的同步源基站的站间同步参考信号位于不同的时刻;
所述基站的同步源基站的站间同步参考信号为所述基站的同步源基站的 同步参考信号中用于站间同步的同步参考信号。
结合第三方面的第一种可能的实现方式, 在第三方面的第二种可能的实 现方式中, 所述基站的同步源基站的同步参考信号中还包括所述基站的同步 源基站的 UE下行同步参考信号, 所述处理器还用于:
配置所述基站的 UE 下行同步参考信号与所述基站的同步源基站的 UE 下行同步参考信号位于相同的时刻。
结合第三方面的第一种或第二种可能的实现方式, 在第三方面的第三种 可能的实现方式中, 所述 UE下行同步参考信号与所述站间同步参考信号的 如下参数项均相同或至少有一项不同:
序列生成公式、 序列长度、 发射功率、 频域资源映射图案。
结合第三方面, 在第三方面的第四种可能的实现方式中, 所述处理器具 体用于:
配置所述基站的同步参考信号与所述基站的同步源基站的同步参考信号 位于不同的时刻, 所述同步参考信号用于 UE下行同步以及站间同步。
结合第三方面的第一种至第四种任一种可能的实现方式, 在第三方面的 第五种可能的实现方式中, 所述处理器还用于:
当所述基站的同步等级与另一基站的同步等级不相同且差值小于预设的 大于 1 的阈值时, 配置所述基站的同步参考信号与所述另一基站的同步参考 信号位于不同的时刻; 或者,
当所述基站的同步等级与另一基站的同步等级的差值大于或等于预设的 大于 1 阈值时, 配置所述基站的同步参考信号与所述另一基站的同步参考信 号位于相同的时刻; 或者,
当所述基站的同步等级与另一基站的同步等级相同时, 配置所述基站的 同步参考信号与所述另一基站的同步参考信号位于相同或不同的时刻。
结合第三方面的第五种可能的实现方式, 在第三方面的第六种可能的实 现方式中, 当所述基站的同步参考信号与同步等级相同的另一基站的同步参 考信号位于相同的时刻时, 所述处理器还用于: 配置所述基站的同步参考信号与所述另一基站的同步参考信号釆用相互 正交的序列; 或者,
配置所述基站的同步参考信号与所述另一基站的同步参考信号釆用相同 的序列。
结合第三方面或第三方面的第一种至第四种任一种可能的实现方式, 在 第三方面的第七种可能的实现方式中, 还包括:
收发器, 用于接收其它基站发送的通知信令;
所述处理器具体用于在所述收发器接收到其它基站发送的通知信令后, 确定自身为同步源基站; 或者, 在所述收发器没有接收到其它基站发送的通 知信令后, 确定自身为被同步基站;
所述其它基站为将所述基站作为同步源基站的基站。
结合第三方面的第七种可能的实现方式, 在第三方面的第八种可能的实 现方式中, 所述同步状态还包括同步等级, 所述处理器还用于:
当所述基站为同步源基站时, 根据所述基站的同步源基站的同步等级确 定自身的同步等级, 其中, 所述基站的同步等级与所述基站的同步源基站的 同步等级相差 1。
结合第三方面或第三方面的第一种至第八种任一种可能的实现方式, 在 第三方面的第九种可能的实现方式中, 所述处理器还用于:
定期检测同步获得参考信号, 并根据检测到的同步获得参考信号重选所 述基站的同步源基站; 或者, 在重选同步源基站后, 向重选前的同步源基站 发送用于译放同步关系的信令; 或者, 在作为同步源基站后检测到自身的同 步关系全部译放后, 将自身同步状态由同步源基站转移为被同步基站; 或者, 在作为被同步基站后接收到其它基站发送的通知信令后, 将自身同步状态由 被同步基站转移为同步源基站, 所述其它基站为将所述基站作为同步源基站 的基站。
结合第三方面或第三方面的第一种至第九种任一种可能的实现方式, 在 第三方面的第十种可能的实现方式中, 所述处理器还用于:
在接收所述基站的同步源基站的用于站间同步的同步参考信号所在的时 刻, 不发送所述基站所在小区的下行信号; 或者,
在接收所述基站的同步源基站的用于站间同步的同步参考信号所在的时 频位置, 不发送所述基站所在小区的下行信号。
结合第三方面或第三方面的第一种至第十种任一种可能的实现方式, 在 第三方面的第十一种可能的实现方式中, 所述同步参考信号为同步跟踪参考 信号。
结合第三方面或第三方面的第一种至第十一种任一种可能的实现方式, 在第三方面的第十二种可能的实现方式中, 当所述基站所在的系统为 LTE TDD系统时, 所述用于站间同步的同步参考信号位于特殊子帧内的保护时隙 内; 或者, 当所述基站所在的系统为 LTE系统时, 所述用于站间同步的同步 参考信号位于 MBSFN子帧内。
通过上述技术方案, 基站的同步参考信号与该基站的同步源基站的用于 站间同步的同步参考信号不在相同的时刻, 可以在同步源基站对应的时刻接 收用于站间同步的同步参考信号并进行站间同步, 之后可以在自身的时刻发 送同步参考信号以用于 UE下行同步或者进一步用于其它基站的站间同步, 可以在一个周期内实现站间同步和 UE下行同步, 提高同步性能。 附图说明 为了更清楚地说明本发明实施例中的技术方案, 下面将对实施例描述中 所需要使用的附图作一简单地介绍, 显而易见地, 下面描述中的附图是本发 明的一些实施例, 对于本领域普通技术人员来讲, 在不付出创造性劳动性的 前提下, 还可以根据这些附图获得其他的附图。
图 1为本发明实施例中的小基站间的同步状态图;
图 2为本发明同步方法一实施例的流程示意图;
图 3 为本发明实施例中各小基站配置的一种同步跟踪参考信号的示意 图;
图 4为本发明实施例中各小基站配置的另一种同步跟踪参考信号的示意 图;
图 5为本发明同步方法另一实施例的流程示意图;
图 6为本发明基站一实施例的结构示意图;
图 7为本发明基站另一实施例的结构示意图。 具体实施方式 为使本发明实施例的目的、 技术方案和优点更加清楚, 下面将结合本发 明实施例中的附图, 对本发明实施例中的技术方案进行清楚、 完整地描述, 显然, 所描述的实施例是本发明一部分实施例, 而不是全部的实施例。 基于 本发明中的实施例, 本领域普通技术人员在没有做出创造性劳动前提下所获 得的所有其他实施例, 都属于本发明保护的范围。
图 1为本发明实施例中的小基站间的同步状态图, 如图 1所示, 密集部 署的一组小基站需要实现站间同步。 在站间同步时, 作为同步源的小基站称 为同步源(source )小基站, 需要通过同步源小基站获得同步的小基站为被同 步(synchronized )小基站, 有一些小基站需要通过同步源小基站获得同步又 要作为另外一些小基站的同步源, 这样的小基站也视为同步源小基站。 小基 站可以为接入节点( Access Point, AP )、 微基站(Micro ), 微微基站(Pico )、 室内基站(Femto )、 低移动性基站( Low Mobility, LoMo )、 低功率发射节点 ( Low Power Node, LPN )或射频拉远单元 ( Radio Remote Unit, RRU )等。
为了标识各个小基站的同步状态, 可以进一步定义同步源小基站的同步 等级, 其中, 通过外界同步源获得同步并为所在小基站组中的其它小基站提 供同步的同步源小基站的同步等级为 L-0,与 L-0同步源小基站站间同步并为 其它小基站提供同步的同步源小基站的同步等级为 L-1 , 依次类推, 与 L-n 同步源小基站站间同步并为其它小基站提供同步的同步源小基站的同步等级 为 L- ( n+l )。 其中, 外界同步源可以包括: 全球定位系统(Global Position System, GPS )、 IEEE 1588方式提供的同步源或者相邻的宏基站。
例如, 图 1的小基站 1〜5之间的同步关系为: 小基站 0可以通过外界同 步源 (如 GPS )获得同步; 小基站 1和小基站 2通过小基站 0获得同步; 小 基站 3通过小基站 2获得同步; 小基站 4通过小基站 2获得同步; 小基站 5 通过小基站 3获得同步。
由于小基站 0〜3为其它小基站提供了同步, 因此这些小基站均为同步源 小基站并具有各自的同步等级,如小基站 0的同步等级为 L-0,也就是说小基 站 0是 L-0同步源小基站; 小基站 1和小基站 2的同步等级为 L-1 , 均为 L-1 同步源小基站; 小基站 3的同步等级为 L-2, 为 L-2同步源小基站。 而小基站 4和小基站 5没有为其它小基站提供同步, 只从其它小基站获得时同步, 因 此为被同步小基站。 当某一小基站通过某一同步源小基站获得同步, 则该同 步源小基站为该小基站的同步源小基站。
另外, 除了上述站间同步之外, 小基站还要为其小区内的 UE提供下行 同步。 例如, 小基站 1除了要接收小基站 0发送的用于站间同步的同步参考 信号之外,小基站 1还需要为其所在小区的 UE提供用于 UE下行同步的同步 参考信号。
现有技术中, 各小基站釆用相同的同步参考信号配置, 并且同步参考信 号既用于站间同步也用于 UE下行同步。 例如, 殳同步参考信号的周期为 2 个子帧, 则小基站 0和小基站 1都需要在第 1、 3、 5...这些子帧上发送同步 参考信号, 即, 小基站 1需要在第 1、 3、 5...中的某个子帧上接收到小基站 0 发送的同步参考信号, 根据该接收的同步参考信号完成站间同步, 之后, 小 基站 1还需要在第 1、 3、 5...中的某个子帧上发送同步参考信号以用于 UE下 行同步。 由于小基站 1不能同时同频接收和发送, 那么小基站 1接收的同步 参考信号以及小基站 1发送的同步参考信号至少需要间隔一个同步参考信号 的周期, 例如, 小基站 1在第 1个子帧上接收到小基站 0发送的同步参考信 号, 由于小基站 1不能在同时同频发送, 那么小基站 1至少要在第 3个子帧 上发送用于 UE下行同步的同步参考信号。 因此, 当同步参考信号的周期较 长时, 站间同步和 UE下行同步都实现就需要较长的时间, 影响了同步性能。
为此, 本发明给出如下实施例以提高同步性能。
图 2为本发明同步方法一实施例的流程示意图, 包括:
21 : 基站确定自身的同步状态, 所述同步状态包括: 被同步基站, 或者, 同步源基站;
其中,该基站可以具体为小基站,例如, AP、 Micro, Pico, Femto、 LoMo、 LPN或 RRU等。 本发明实施例后续具体描述时以小基站为例。
22: 所述基站根据自身的同步状态配置所述基站的同步参考信号, 使得 第一时刻与第二时刻不同, 所述第一时刻为所述基站的同步参考信号所在的 时刻, 所述第二时刻为所述基站的同步源基站的用于站间同步的同步参考信 号所在的时刻。
其中, 同步参考信号可以包括同步获得参考信号和同步跟踪参考信号, 同步获得参考信号用于开机时的定时同步, 同步跟踪参考信号用于周期性的 同步跟踪以及时纠正同步偏差。 同步获得参考信号如长期演进(Long Term Evolution, LTE ) 系统中的主同步信号 (Primary Synchronous Signal, PSS ) 和次同步信号 ( Secondary Synchronous Signal, SSS ), 同步跟踪参考信号如 LTE系统中的公共参考信号 ( Common Reference Signal, CRS )。
本发明实施例以同步参考信号为同步跟踪参考信号为例。
另外, 上述的时刻可以是指子帧或者符号等时域资源, 本发明实施例以 子帧为例。
当小基站不论是同步源小基站, 还是被同步小基站时, 该小基站发送的 同步跟踪参考信号至少用于该小基站所在的小区的 UE的下行同步。 当该小 基站是同步源小基站时, 该同步跟踪参考信号还用于为该小基站的被同步小 基站提供站间同步。
用于 UE下行同步的同步跟踪参考信号和用于站间同步的同步跟踪参考 信号可以分别为独立的同步跟踪参考信号, 此时可以分别称为 UE下行同步 跟踪参考信号和站间同步跟踪参考信号。 或者, 也可以同一个同步跟踪参考 信号既用于 UE下行同步也用于站间同步。 下面分别描述。
方式一: 将同步跟踪参考信号分为 UE下行同步跟踪参考信号和站间同 步跟踪参考信号。
该方式下, 同步源小基站发送的同步跟踪参考信号包括上述的两种同步 跟踪参考信号, 被同步小基站发送的同步跟踪参考信号只包括 UE下行同步 跟踪参考信号。 此时, 同步源小基站配置的同步跟踪参考信号的时域密度高 于被同步小基站配置的同步跟踪参考信号的时域密度。
一方面, 对于同步源小基站: 配置 UE下行同步跟踪参考信号和站间同 步跟踪参考信号, 且位于不同的子帧上。 两种同步跟踪参考信号的具体配置 可以 ¾口下:
( 1 ) UE下行同步跟踪参考信号和站间同步跟踪参考信号配置相同, 即 配置相同的序列生成公式, 配置相同的参数, 配置在所在时域区间内使用相 同的频域资源映射图案; 或者,
( 2 ) UE下行同步跟踪参考信号和站间同步跟踪参考信号配置不同, 例 如, 配置不同的序列生成公式, 或者, 配置不同的参数, 或者, 配置在所在 时域区间内使用不同的频域资源映射图案。 上述配置的参数例如包括序列长度, 发射功率等。
( 3 ) UE下行同步跟踪参考信号的时域密度和站间同步跟踪参考信号的 时域密度可以相同或不同。
由于同步等级大于 L-0的同步源小基站需要从上一级的同步源小基站(即 其同步源)获得定时同步, 另外还要为其小区内的 UE提供下行定时同步。 为了解决不能同时同频发送和接收的问题, 该同步源小基站的 UE下行同步 跟踪参考信号与该同步源小基站的上一级的同步源小基站的站间同步跟踪参 考信号需要在不同的子帧上。 另外, 由于该同步源小基站还需要为其它小基 站提供定时同步, 该同步源小基站的站间同步跟踪参考信号与该同步源小基 站的上一级的同步源小基站的站间同步跟踪参考信号也需要在不同的子帧 上。
具体的, 可以配置: 当两个同步源小基站的同步等级差小于设定的阈值 k ( k>l ) 时, 该两个同步源小基站的站间同步跟踪参考信号位于不同的子帧 上; 当该两个同步源小基站的同步等级差大于或等于 k时, 该两个同步源小 基站的站间同步跟踪参考信号位于不同或相同的子帧上。
对于同步等级相同的两个同步源小基站, 其发送的同步跟踪参考信号可 以位于相同的子帧或者不同的子帧上, 当位于相同的子帧上时, 可以釆用相 互正交的序列以区分不同的同步源小基站, 或者釆用完全相同的序列实现发 送分集以提高同步性能。
另一方面, 对于被同步小基站: 仅配置 UE下行同步跟踪参考信号。 被同步小基站的该 UE下行同步跟踪参考信号的时域密度满足 UE下行同 步跟踪精度需求即可。
被同步小基站的 UE下行同步跟踪参考信号的时域密度可以与同步源小 基站的 UE下行同步跟踪参考信号的时域密度相同。
另外, 同步源小基站的 UE下行同步跟踪参考信号的配置和被同步小基 站的 UE下行同步跟踪参考信号的配置可以沿用现有的同步跟踪参考信号的 配置, 以实现后向兼容。 例如, 现有的同步跟踪参考信号在第 1、 3、 5...这 些子帧上发送, 那么同步源小基站的 UE下行同步跟踪参考信号和被同步小 基站的 UE下行同步跟踪参考信号也在第 1、 3、 5...这些子帧上发送。
例如, 参见图 3 , 为各小基站配置的同步跟踪参考信号的示意图。 其中, 小基站 0、 小基站 1和小基站 3均为同步源小基站并且具有相应的同步等级, 小基站 5为被同步小基站。
如图 3所示, 同步源小基站, 也就是小基站 0、 小基站 1和小基站 3发 送的同步跟踪参考信号包括 UE下行同步跟踪参考信号和站间同步跟踪参考 信号; 被同步小基站, 也就是小基站 5发送的同步跟踪参考信号仅包括 UE 下行同步跟踪参考信号。
对于同步源小基站, 每个同步源小基站发送的 UE下行同步跟踪参考信 号以及站间同步跟踪参考信号与其上一级的同步源小基站发送的站间同步跟 踪参考信号位于不同的子帧上。 例如, 小基站 1的 UE下行同步跟踪参考信 号与小基站 0的站间同步跟踪参考信号位于不同的子帧上, 以及, 小基站 1 的站间同步跟踪参考信号与小基站 0的站间同步跟踪参考信号也位于不同的 子帧上。
另外, 对于不相邻的两个同步源小基站, 例如设置的阈值 k=2时, 小基 站 3的 UE下行同步跟踪参考信号和 /或站间同步跟踪参考信号与小基站 0的 站间同步跟踪参考信号可以位于相同的子帧或不同的子帧上。 当位于相同的 子帧上时可以降低系统设计的复杂度。
再者, 本实施例以兼容现有设计为例, 也就是说, 各小基站的 UE下行 同步跟踪参考信号可以沿用现有的设计, 例如, 参见图 2, 各小基站的 UE下 行同步跟踪参考信号位于相同的子帧上。 此时, 仅需要各相邻同步源小基站 的站间同步跟踪参考信号位于不同的子帧上。
方式二: 同步跟踪参考信号既用于 UE下行同步又用于站间同步。
该方式下, 类似现有技术, 同步跟踪参考信号将用于上述两种用途, 与 现有技术不同的是, 本实施例的小基站与其同步源的同步跟踪参考信号需要 位于不同的子帧上。 此时, 同步源小基站配置的同步跟踪参考信号的时域密 度与被同步小基站配置的同步跟踪参考信号的时域密度相同。 另外, 为了提 高性能, 小基站与其同步源的同步参考信号的最小间隔小于现有的同步参考 信号的发送周期。
对于不同同步等级的同步源小基站, 可以设置阈值 k ( k>l ), 该两个同 步源小基站的同步等级差小于 k时, 这两个同步源小基站的同步跟踪参考信 号位于不同的子帧上; 当该两个同步源小基站的同步等级差大于或等于 k时, 该两个同步源小基站的同步跟踪参考信号位于不同或相同的子帧上。
对于同步等级相同的两个同步源小基站, 其发送的同步跟踪参考信号可 以位于相同的子帧或者不同的子帧上, 当位于相同的子帧上时, 可以釆用相 互正交的序列以区分不同的同步源小基站, 或者釆用完全相同的序列实现发 送分集以提高同步性能。
由于小基站与其上一级的同步源小基站的同步跟踪参考信号位于不同的 子帧上, 因此小基站可以在不同的时间发送本小区的 UE下行同步跟踪参考 信号以及接收其上一级的同步源小基站发送的同步跟踪参考信号, 分别完成 UE定时同步和站间定时同步。
例如, 参见图 4, 各小基站均配置同步跟踪参考信号, 这些同步跟踪参 考信号的内容可以相同, 每个小基站与其上一级的同步源小基站的同步跟踪 参考信号位于不同的子帧上。 例如, 小基站 1的同步跟踪参考信号与小基站 0的同步跟踪参考信号位于不同的子帧, 小基站 3 的同步跟踪参考信号与小 基站 1的同步跟踪参考信号位于不同的子帧, 小基站 5的同步跟踪参考信号 与小基站 3的同步跟踪参考信号位于不同的子帧。
另外, 对于非存在直接同步关系的小基站, 其同步跟踪参考信号可以位 于相同的子帧, 例如, 图 4中的小基站 5与小基站 0的同步跟踪参考信号位 于相同的子帧, 以降低系统复杂度。 上述的方式一区分了同步跟踪参考信号, 此时, UE下行同步跟踪参考信号可以沿用现有设计, 支持后续兼容; 方式二 没有区分同步跟踪参考信号, 可以降低参考信号开销。
另外, 小基站在接收所述小基站的同步源小基站的用于站间同步的同步 参考信号所在的时刻, 不发送所述小基站所在小区的下行信号; 或者, 小基 站在接收所述小基站的同步源小基站的用于站间同步的同步参考信号所在的 时频位置, 不发送所述小基站所在小区的下行信号。 例如, 参见图 3 , 小基 站 1在小基站 0的站间同步跟踪参考信号所在的子帧 (或者时频位置)上, 不发送小基站 1所在小区的下行信号。
为了使得站间同步参考信号的接收和发送不影响小基站与 UE的正常通 信, 可以在特定的时刻发送用于站间同步的参考信号。 例如, 在 LTE时分双 工 (Time Division Duplex, TDD ) 系统, 用于站间同步的参考信号可以位于 特殊子帧内用于上下行切换的保护时隙 ( Guard Period , GP )内, 由于这部分 时隙内基站与 UE之间没有信号传输, 且可以通过时隙长度配置, 使得保证 系统进行上下行切换所需时间以外仍有冗余时间用于传输站间同步参考信 号。 前述不同同步等级的小基站可以在不同特殊子帧的 GP 内发送站间同步 参考信号, 或者在同一特殊子帧的 GP内的不同时刻发送站间同步参考信号。 此外, 在 LTE系统, 用于站间同步的参考信号还可以位于被配置为广播多播 ( Multi-Broadcast Single Frequency Network, MBSFN )的下行子帧内, MBSFN 子帧内基站和 UE之间可以没有数据传输, 前述不同同步等级的小基站可以 在不同 MBSFN子帧发送站间同步参考信号, 或者在同一 MBSFN子帧内的 不同时刻发送站间同步参考信号。 这里设定了 LTE系统中站间同步参考信号 的发送子帧位置, 小基站在这些子帧上发送站间同步参考信号的配置方法如 前面所述。
本实施例中, 小基站的同步参考信号与该小基站的同步源的用于站间同 步的同步参考信号不在相同的子帧, 可以在同步源对应的子帧接收用于站间 同步的同步参考信号并进行站间同步, 之后可以在自身的子帧发送同步参考 信号以用于 UE下行同步或者进一步用于其它小基站的站间同步, 可以在一 个周期内实现站间同步和 UE下行同步, 提高同步性能。
图 5为本发明同步方法另一实施例的流程示意图, 包括:
51 : 小基站开机, 确定其同步源, 获得初始的定时同步。
当小基站具有 GPS或宏基站等外界定时同步获得功能时, 则该小基站从 外界同步源获得初始的定时同步。
当小基站不具备外界定时同步获得功能时, 则接收周围小基站发送的同 步获得参考信号, 通过相关检测, 识别接收功率最强的同步获得参考信号, 根据该接收功率最强的同步获得参考信号获得初始的定时同步, 并确定发送 该同步获得参考信号的小基站, 将其作为同步源。 另外, 获得初始的定时同 步的小基站可以发送通知信令给其同步源的小基站, 该通知信令用于通知已 通过该同步源的小基站获得定时同步。
52: 小基站确定自身的同步状态, 并配置相应的同步跟踪参考信号。 如果小基站收到其余小基站发送的通知信令, 则可以确定自身为同步源 小基站, 并且可以釆用如下方式确定自身的同步等级:
当小基站从外界同步源获得初始的定时同步时, 可以确定自身的同步等 级为 L-0;
当小基站从其余小基站获得初始的定时同步时, 可以首先获知其上一级 的同步源小基站的同步等级, 之后在该同步等级的基础上加 1作为自身的同 步等级。 例如, 小基站从 L-0的同步源小基站获得初始的定时同步后, 该小 基站的同步等级为 L-l。
如果小基站没有收到其余小基站发送的通知信令, 则可以确定自身为被 同步小基站。
在确定出自身的同步状态后, 可以根据图 3或图 4所示的方式配置同步 跟踪参考信号。
例如, 同步跟踪参考信号包括 UE下行同步跟踪参考信号和站间同步跟 踪参考信号时, 小基站可以根据其上一级的同步源小基站, 也就是其同步源 的同步跟踪参考信号的配置进行自身的配置, 将自身的同步跟踪参考信号配 置成与其同步源的站间同步跟踪参考信号位于不同的子帧, 其中, 当小基站 为同步源小基站时, 该自身的同步跟踪参考信号包括自身的 UE 同步跟踪参 考信号和自身的站间同步跟踪参考信号; 当小基站为被同步小基站时, 该自 身的同步跟踪参考信号包括自身的 UE同步跟踪参考信号。
又例如, 同步跟踪参考信号既用于 UE下行同步又用于站间同步时, 配 置小基站的同步跟踪参考信号与其同步源的同步跟踪参考信号位于不同的子 帧上。
另外, 一个小基站的上一级同步源小基站可以通过第一信令向该小基站 通知该上一级同步源小基站的同步等级,以便该小基站确定自身的同步等级; 该上一级同步源小基站还可以通过第二信令向该小基站通过该上一级同步源 小基站的同步跟踪信号的配置, 以便该小基站完成自身的配置。 其中, 第一 信令和第二信令可以为两条信令, 也可以属于同一条信令。 或者, 也可以预 配置同步等级与同步跟踪参考信号配置之间的对应关系, 此时, 上一级同步 源小基站也可以不向该小基站发送同步跟踪参考信号的配置, 而是由小基站 根据隐性的同步等级与同步跟踪参考信号之间的对应关系确定出自身的同步 跟踪参考信号的配置。
53: 小基站根据其同步源的同步跟踪参考信号的配置, 接收同步源发送 的站间同步跟踪参考信号, 进行站间同步跟踪; 并根据自身的同步跟踪参考 信号的配置, 发送自身的同步跟踪参考信号。
其中, 当小基站为被同步小基站时, 该自身的同步跟踪参考信号包括: 该小基站的 UE下行同步跟踪参考信号,用于本小区 UE下行同步跟踪。或者, 当小基站为同步源小基站时, 该自身的同步跟踪参考信号包括: 该小基 站的 UE下行同步跟踪参考信号, 用于本小区 UE下行同步跟踪; 以及, 该小 基站的站间同步跟踪参考信号, 用于其余小基站的站间同步。
可选的, 小基站的同步状态可以更新, 之后可以重复执行 52〜53。
例如, 当有新的小基站加入,或者, 小基站关机或开机(power off 或 on ) 等条件下可以更新, 更新的内容可以包括如下项的至少一项:
同步源重选: 小基站可以定期重新检测周围小基站发送的同步获得参考 信号, 如果检测到比当前的同步源信号质量更好的同步源, 则可以将其同步 源切换到新的小基站。 如果小基站本身也是其它小基站的同步源小基站, 则 还可以根据新的同步源的同步等级更新自身的同步等级并发送信令告知通过 其获得同步的小基站更新同步等级。
同步关系译放: 当小基站进行同步源重选或者进入静默状态没有服务用 户时, 小基站可以向原来的同步源发送信令, 以译放与其的同步关系。
同步源小基站和被同步小基站状态转移: 当作为同步源 d、基站的小基站 发现通过其获得同步的小基站都与其进行了同步关系译放, 则将同步源小基 站的状态转移为被同步小基站状态; 当作为被同步小基站的小基站收到其它 小基站发送的通过其获得同步的通知信令时, 则从被同步小基站状态转移为 同步源小基站状态。 小基站的同步状态改变后, 其同步跟踪参考信号的配置 也相应改变。
上述小基站与其同步源之间的信令交互, 具体可以通过如下几种方式: 基站之间的 X2接口、 基站之间的空口, 或者, 上层集中控制器转发。
此外, 提供同步和获得同步的小基站可以属于同一个运营商或不同的运 营商。
本实施例将小基站与其同步源进行区分配置, 可以避免等待过长的时间 完成同步, 保证了 UE下行同步和小基站间的站间同步性能; 对于同步等级 相差较远的两个小基站其同步参考信号可以配置使用相同的子帧, 可以降低 资源开销, 减少网络功耗消耗; 通过区分 UE下行同步跟踪参考信号和站间 同步跟踪参考信号, 并保持 UE下行同步跟踪参考信号不变, 可以兼容现有 系统; 通过使用不同子帧上的用于 UE下行同步以及站间同步跟踪参考信号, 可以降低资源开销。
图 6为本发明基站一实施例的结构示意图, 该基站可以为小基站, 该基 站 60包括确定模块 61和配置模块 62; 确定模块 61用于确定自身的同步状 态, 所述同步状态包括: 被同步基站, 或者, 同步源基站; 配置模块 62用于 根据自身的同步状态配置所述基站的同步参考信号 , 使得第一时刻与第二时 刻不同, 所述第一时刻为所述基站的同步参考信号所在的时刻, 所述第二时 刻为所述基站的同步源基站的用于站间同步的同步参考信号所在的时刻。
可选的, 所述配置模块具体用于:
当所述基站为同步源基站时, 配置所述基站的同步参考信号包括位于不 同时刻的所述基站的 UE下行同步参考信号和所述基站的站间同步参考信号 , 且所述基站的 UE下行同步参考信号与所述基站的同步源基站的站间同步参 考信号位于不同的时刻, 以及所述基站的站间同步参考信号与所述基站的同 步源基站的站间同步参考信号位于不同的时刻;
当所述基站为被同步基站时, 配置所述基站的同步参考信号包括所述基 站的 UE下行同步参考信号,且所述基站的 UE下行同步参考信号与所述基站 的同步源基站的站间同步参考信号位于不同的时刻;
所述基站的同步源基站的站间同步参考信号为所述基站的同步源基站的 同步参考信号中用于站间同步的同步参考信号。
可选的, 所述基站的同步源基站的同步参考信号中还包括所述基站的同 步源基站的 UE下行同步参考信号, 所述配置模块还用于:
配置所述基站的 UE 下行同步参考信号与所述基站的同步源基站的 UE 下行同步参考信号位于相同的时刻。
可选的, 所述 UE下行同步参考信号与所述站间同步参考信号的如下参 数项均相同或至少有一项不同:
序列生成公式、 序列长度、 发射功率、 频域资源映射图案。
可选的, 所述配置模块具体用于:
配置所述基站的同步参考信号与所述基站的同步源基站的同步参考信号 位于不同的时刻, 所述同步参考信号用于 UE下行同步以及站间同步。 可选的, 所述配置模块还用于:
当所述基站的同步等级与另一基站的同步等级不相同且差值小于预设的 大于 1 的阈值时, 配置所述基站的同步参考信号与所述另一基站的同步参考 信号位于不同的时刻; 或者,
当所述基站的同步等级与另一基站的同步等级的差值大于或等于预设的 大于 1 阈值时, 配置所述基站的同步参考信号与所述另一基站的同步参考信 号位于相同的时刻; 或者,
当所述基站的同步等级与另一基站的同步等级相同时, 配置所述基站的 同步参考信号与所述另一基站的同步参考信号位于相同或不同的时刻。
可选的, 当所述基站的同步参考信号与同步等级相同的另一基站的同步 参考信号位于相同的时刻时, 所述配置模块还用于:
配置所述基站的同步参考信号与所述另一基站的同步参考信号釆用相互 正交的序列; 或者,
配置所述基站的同步参考信号与所述另一基站的同步参考信号釆用相同 的序列。
可选的, 所述确定模块具体用于:
当所述基站接收到其它基站发送的通知信令后,确定自身为同步源基站; 当所述基站没有接收到其它基站发送的通知信令时, 确定自身为被同步 基站;
所述其它基站为将所述基站作为同步源基站的基站。
可选的, 所述同步状态还包括同步等级, 所述确定模块还用于: 当所述基站为同步源基站时, 根据所述基站的同步源基站的同步等级确 定自身的同步等级, 其中, 所述基站的同步等级与所述基站的同步源基站的 同步等级相差 1。
可选的, 该基站还包括:
更新模块, 用于定期检测同步获得参考信号, 并根据检测到的同步获得 参考信号重选所述基站的同步源基站; 或者, 在重选同步源基站后, 向重选 前的同步源基站发送用于译放同步关系的信令; 或者, 在作为同步源基站后 检测到自身的同步关系全部译放后, 将自身同步状态由同步源基站转移为被 同步基站; 或者, 所述基站在作为被同步基站后接收到其它基站发送的通知 信令后, 将自身同步状态由被同步基站转移为同步源基站, 所述其它基站为 将所述基站作为同步源基站的基站。
可选的, 所述配置模块还用于:
在接收所述基站的同步源基站的用于站间同步的同步参考信号所在的时 刻, 不发送所述基站所在小区的下行信号; 或者,
在接收所述基站的同步源基站的用于站间同步的同步参考信号所在的时 频位置, 不发送所述基站所在小区的下行信号。
可选的, 所述同步参考信号为同步跟踪参考信号。
可选的, 当所述基站所在的系统为 LTE TDD系统时, 所述用于站间同步 的同步参考信号位于特殊子帧内的保护时隙内; 或者, 当所述基站所在的系 统为 LTE系统时, 所述用于站间同步的同步参考信号位于 MBSFN子帧内。
本实施例中, 基站的同步参考信号与该基站的同步源基站的用于站间同 步的同步参考信号不在相同的时刻, 可以在同步源基站对应的时刻接收用于 站间同步的同步参考信号并进行站间同步, 之后可以在自身的时刻发送同步 参考信号以用于 UE下行同步或者进一步用于其它基站的站间同步, 可以在 一个周期内实现站间同步和 UE下行同步, 提高同步性能。
图 7为本发明基站另一实施例的结构示意图, 该基站可以为小基站, 该 基站 70包括发射电路 702、 接收电路 703、 功率控制器 704、 处理器 705 , 存储器 706及天线 701。 处理器 705控制设备 70的操作, 处理器 705还可以 称为 CPU。 存储器 706可以包括只读存储器和随机存取存储器, 并向处理器 705提供指令和数据。 存储器 706的一部分还可以包括非易失行随机存取存 储器(NVRAM )。 具体的应用中, 基站 70可以嵌入或者本身可以就是小基 站, 还可以包括容纳发射电路 702和接收电路 703 的载体, 以允许基站 70 和远程设备之间进行数据发射和接收。而有可能基站 70也是网络或无线设备 的简单示意图。 发射电路 702和接收电路 703可以耦合到天线 701。基站 70 的各个组件通过总线系统 7100耦合在一起, 其中, 总线系统 7100除包括数 据总线之外, 还包括电源总线、 控制总线和状态信号总线。 但是为了清楚说 明起见, 在图中将各种总线都标为总线系统 7100。 基站 70还可以包括功率 控制器 704。
上述本发明实施例揭示的方法可以应用于处理器 705 中, 或者说由处理 器 705以实现。 处理器 705可能是一种集成电路芯片, 具有信号的处理能力。 在实现过程中, 上述方法的各步骤可以通过处理器 705 中的硬件的集成逻辑 电路或者软件形式的指令完成。 用于执行本发明实施例揭示的方法, 上述的 处理器可以是通用处理器、 数字信号处理器(DSP )、 专用集成电路(ASIC )、 现成可编程门阵列(FPGA )或者其他可编程逻辑器件、 分立门或者晶体管逻 步骤及逻辑框图。 通用处理器可以是微处理器或者该处理器也可以是任何常 规的处理器, 解码器等。 结合本发明实施例所公开的方法的步骤可以直接体 现为硬件解码处理器执行完成, 或者用解码处理器中的硬件及软件模块组合 执行完成。 软件模块可以位于随机存储器, 闪存、 只读存储器, 可编程只读 存储器或者电可擦写可编程存储器、 寄存器等本领域成熟的存储介质中。 该 存储介质位于存储器 706, 处理器 705读取存储器 706中的信息, 结合其硬 件完成上述方法的步骤。
具体的, 该基站可以包括: 处理器, 用于确定自身的同步状态, 所述同 步状态包括: 被同步基站, 或者, 同步源基站; 以及, 根据自身的同步状态 配置所述基站的同步参考信号, 使得第一时刻与第二时刻不同, 所述第一时 刻为所述基站的同步参考信号所在的时刻, 所述第二时刻为所述基站的同步 源基站的用于站间同步的同步参考信号所在的时刻。
可选的, 所述处理器具体用于:
当所述基站为同步源基站时, 配置所述基站的同步参考信号包括位于不 同时刻的所述基站的 UE下行同步参考信号和所述基站的站间同步参考信号 , 且所述基站的 UE下行同步参考信号与所述基站的同步源基站的站间同步参 考信号位于不同的时刻, 以及所述基站的站间同步参考信号与所述基站的同 步源基站的站间同步参考信号位于不同的时刻;
当所述基站为被同步基站时, 配置所述基站的同步参考信号包括所述基 站的 UE下行同步参考信号,且所述基站的 UE下行同步参考信号与所述基站 的同步源基站的站间同步参考信号位于不同的时刻;
所述基站的同步源基站的站间同步参考信号为所述基站的同步源基站的 同步参考信号中用于站间同步的同步参考信号。
可选的, 所述基站的同步源基站的同步参考信号中还包括所述基站的同 步源基站的 UE下行同步参考信号, 所述处理器还用于:
配置所述基站的 UE 下行同步参考信号与所述基站的同步源基站的 UE 下行同步参考信号位于相同的时刻。
可选的, 所述 UE下行同步参考信号与所述站间同步参考信号的如下参 数项均相同或至少有一项不同:
序列生成公式、 序列长度、 发射功率、 频域资源映射图案。
可选的, 所述处理器具体用于:
配置所述基站的同步参考信号与所述基站的同步源基站的同步参考信号 位于不同的时刻, 所述同步参考信号用于 UE下行同步以及站间同步。
可选的, 所述处理器还用于:
当所述基站的同步等级与另一基站的同步等级不相同且差值小于预设的 大于 1 的阈值时, 配置所述基站的同步参考信号与所述另一基站的同步参考 信号位于不同的时刻; 或者,
当所述基站的同步等级与另一基站的同步等级的差值大于或等于预设的 大于 1 阈值时, 配置所述基站的同步参考信号与所述另一基站的同步参考信 号位于相同的时刻; 或者,
当所述基站的同步等级与另一基站的同步等级相同时, 配置所述基站的 同步参考信号与所述另一基站的同步参考信号位于相同或不同的时刻。
可选的, 当所述基站的同步参考信号与同步等级相同的另一基站的同步 参考信号位于相同的时刻时, 所述处理器还用于:
配置所述基站的同步参考信号与所述另一基站的同步参考信号釆用相互 正交的序列; 或者,
配置所述基站的同步参考信号与所述另一基站的同步参考信号釆用相同 的序列。
可选的, 该基站还包括:
收发器, 用于接收其它基站发送的通知信令;
所述处理器具体用于在所述收发器接收到其它基站发送的通知信令后, 确定自身为同步源基站; 或者, 在所述收发器没有接收到其它基站发送的通 知信令后, 确定自身为被同步基站;
所述其它基站为将所述基站作为同步源基站的基站。 可选的, 所述同步状态还包括同步等级, 所述处理器还用于: 当所述基站为同步源基站时, 根据所述基站的同步源基站的同步等级确 定自身的同步等级, 其中, 所述基站的同步等级与所述基站的同步源基站的 同步等级相差 1。
可选的, 所述处理器还用于:
定期检测同步获得参考信号, 并根据检测到的同步获得参考信号重选所 述基站的同步源基站; 或者, 在重选同步源基站后, 向重选前的同步源基站 发送用于译放同步关系的信令; 或者, 在作为同步源基站后检测到自身的同 步关系全部译放后, 将自身同步状态由同步源基站转移为被同步基站; 或者, 在作为被同步基站后接收到其它基站发送的通知信令后, 将自身同步状态由 被同步基站转移为同步源基站, 所述其它基站为将所述基站作为同步源基站 的基站。
可选的, 所述处理器还用于: 在接收所述基站的同步源基站的用于站间 同步的同步参考信号所在的时刻, 不发送所述基站所在小区的下行信号; 或 者, 在接收所述基站的同步源基站的用于站间同步的同步参考信号所在的时 频位置, 不发送所述基站所在小区的下行信号。
可选的, 所述同步参考信号为同步跟踪参考信号。
可选的, 当所述基站所在的系统为 LTE TDD系统时, 所述用于站间同步 的同步参考信号位于特殊子帧内的保护时隙内; 或者, 当所述基站所在的系 统为 LTE系统时, 所述用于站间同步的同步参考信号位于 MBSFN子帧内。
本实施例中, 基站的同步参考信号与该基站的同步源基站的用于站间同 步的同步参考信号不在相同的时刻, 可以在同步源基站对应的时刻接收用于 站间同步的同步参考信号并进行站间同步, 之后可以在自身的时刻发送同步 参考信号以用于 UE下行同步或者进一步用于其它基站的站间同步, 可以在 一个周期内实现站间同步和 UE下行同步, 提高同步性能。
所属领域的技术人员可以清楚地了解到, 为描述的方便和简洁, 仅以上 述各功能模块的划分进行举例说明, 实际应用中, 可以根据需要而将上述功 能分配由不同的功能模块完成,即将装置的内部结构划分成不同的功能模块, 以完成以上描述的全部或者部分功能。 上述描述的系统, 装置和单元的具体 工作过程, 可以参考前述方法实施例中的对应过程, 在此不再赘述。 在本申请所提供的几个实施例中, 应该理解到, 所揭露的系统, 装置和 方法, 可以通过其它的方式实现。 例如, 以上所描述的装置实施例仅仅是示 意性的, 例如, 所述模块或单元的划分, 仅仅为一种逻辑功能划分, 实际实 现时可以有另外的划分方式, 例如多个单元或组件可以结合或者可以集成到 另一个系统, 或一些特征可以忽略, 或不执行。 另一点, 所显示或讨论的相 互之间的耦合或直接耦合或通信连接可以是通过一些接口, 装置或单元的间 接耦合或通信连接, 可以是电性, 机械或其它的形式。
所述作为分离部件说明的单元可以是或者也可以不是物理上分开的, 作 为单元显示的部件可以是或者也可以不是物理单元, 即可以位于一个地方, 或者也可以分布到多个网络单元上。 可以根据实际的需要选择其中的部分或 者全部单元来实现本实施例方案的目的。
另外,在本申请各个实施例中的各功能单元可以集成在一个处理单元中, 也可以是各个单元单独物理存在, 也可以两个或两个以上单元集成在一个单 元中。 上述集成的单元既可以釆用硬件的形式实现, 也可以釆用软件功能单 元的形式实现。
所述集成的单元如果以软件功能单元的形式实现并作为独立的产品销售 或使用时, 可以存储在一个计算机可读取存储介质中。 基于这样的理解, 本 申请的技术方案本质上或者说对现有技术做出贡献的部分或者该技术方案的 全部或部分可以以软件产品的形式体现出来, 该计算机软件产品存储在一个 存储介质中, 包括若干指令用以使得一台计算机设备(可以是个人计算机, 服务器, 或者网络设备等)或处理器(processor )执行本申请各个实施例所 述方法的全部或部分步骤。 而前述的存储介质包括: U盘、 移动硬盘、 只读 存储器(ROM, Read-Only Memory ),随机存取存储器(RAM, Random Access Memory )、 磁碟或者光盘等各种可以存储程序代码的介质。
以上所述, 以上实施例仅用以说明本申请的技术方案, 而非对其限制; 尽管参照前述实施例对本申请进行了详细的说明, 本领域的普通技术人员应 当理解: 其依然可以对前述各实施例所记载的技术方案进行修改, 或者对其 中部分技术特征进行等同替换; 而这些修改或者替换, 并不使相应技术方案 的本质脱离本申请各实施例技术方案的精神和范围。

Claims

权 利 要求 书
1、 一种同步方法, 其特征在于, 包括:
基站确定自身的同步状态, 所述同步状态包括: 被同步基站, 或者, 同 步源基站;
所述基站根据自身的同步状态配置所述基站的同步参考信号, 使得第一 时刻与第二时刻不同,所述第 -时刻为所述基站的同步参考信号所在的时刻 , 所述第二时刻为所述基站的同步源基站的用于站间同步的同步参考信号所在 的时刻。
2、 根据权利要求 1所述的方法, 其特征在于, 所述配置所述基站的同步 参考信号, 包括:
当所述基站为同步源基站时, 配置所述基站的同步参考信号包括位于不 同时刻的所述基站的用户设备 UE下行同步参考信号和所述基站的站间同步 参考信号, 且所述基站的 UE下行同步参考信号与所述基站的同步源基站的 站间同步参考信号位于不同的时刻, 以及所述基站的站间同步参考信号与所 述基站的同步源基站的站间同步参考信号位于不同的时刻;
当所述基站为被同步基站时, 配置所述基站的同步参考信号包括所述基 站的 UE下行同步参考信号,且所述基站的 UE下行同步参考信号与所述基站 的同步源基站的站间同步参考信号位于不同的时刻;
所述基站的同步源基站的站间同步参考信号为所述基站的同步源基站的 同步参考信号中用于站间同步的同步参考信号。
3、 根据权利要求 2所述的方法, 其特征在于, 所述基站的同步源基站的 同步参考信号中还包括所述基站的同步源基站的 UE下行同步参考信号, 所 述配置所述基站的同步参考信号, 还包括:
配置所述基站的 UE 下行同步参考信号与所述基站的同步源基站的 UE 下行同步参考信号位于相同的时刻。
4、 根据权利要求 2或 3所述的方法, 其特征在于, 所述 UE下行同步参 考信号与所述站间同步参考信号的如下参数项均相同或至少有一项不同: 序列生成公式、 序列长度、 发射功率、 频域资源映射图案。
5、 根据权利要求 1所述的方法, 其特征在于, 所述配置所述基站的同步 参考信号, 包括: 配置所述基站的同步参考信号与所述基站的同步源基站的同步参考信号 位于不同的时刻, 所述同步参考信号用于 UE下行同步以及站间同步。
6、 根据权利要求 2-5任一项所述的方法, 其特征在于, 所述同步状态还 包括同步等级, 所述配置所述基站的同步参考信号, 还包括:
当所述基站的同步等级与另一基站的同步等级不相同且差值小于预设的 大于 1 的阈值时, 配置所述基站的同步参考信号与所述另一基站的同步参考 信号位于不同的时刻; 或者,
当所述基站的同步等级与另一基站的同步等级的差值大于或等于预设的 大于 1 阈值时, 配置所述基站的同步参考信号与所述另一基站的同步参考信 号位于相同的时刻; 或者,
当所述基站的同步等级与另一基站的同步等级相同时, 配置所述基站的 同步参考信号与所述另一基站的同步参考信号位于相同或不同的时刻。
7、 根据权利要求 6所述的方法, 其特征在于, 当所述基站的同步参考信 号与同步等级相同的另一基站的同步参考信号位于相同的时刻时, 所述配置 所述基站的同步参考信号, 还包括:
配置所述基站的同步参考信号与所述另一基站的同步参考信号釆用相互 正交的序列; 或者,
配置所述基站的同步参考信号与所述另一基站的同步参考信号釆用相同 的序列。
8、 根据权利要求 1-5任一项所述的方法, 其特征在于, 所述基站确定自 身的同步状态, 包括:
当所述基站接收到其它基站发送的通知信令后,确定自身为同步源基站; 当所述基站没有接收到其它基站发送的通知信令时, 确定自身为被同步 基站; 所述其它基站为将所述基站作为同步源基站的基站。
9、 根据权利要求 8所述的方法, 其特征在于, 所述同步状态还包括同步 等级, 所述基站确定自身的同步状态, 还包括:
当所述基站为同步源基站时, 根据所述基站的同步源基站的同步等级确 定自身的同步等级, 其中, 所述基站的同步等级与所述基站的同步源基站的 同步等级相差 1。
10、 根据权利要求 1-9任一项所述的方法, 其特征在于, 还包括: 所述基站定期检测同步获得参考信号, 并根据检测到的同步获得参考信 号重选所述基站的同步源基站; 或者,
所述基站在重选同步源基站后, 向重选前的同步源基站发送用于译放同 步关系的信令; 或者,
所述基站在作为同步源基站后检测到自身的同步关系全部译放后, 将自 身同步状态由同步源基站转移为被同步基站; 或者, 所述基站在作为被同步 基站后接收到其它基站发送的通知信令后, 将自身同步状态由被同步基站转 移为同步源基站, 所述其它基站为将所述基站作为同步源基站的基站。
11、 根据权利要求 1-10任一项所述的方法, 其特征在于,
所述基站在接收所述基站的同步源基站的用于站间同步的同步参考信号 所在的时刻, 不发送所述基站所在小区的下行信号; 或者,
所述基站在接收所述基站的同步源基站的用于站间同步的同步参考信号 所在的时频位置, 不发送所述基站所在小区的下行信号。
12、 根据权利要求 1-11任一项所述的方法, 其特征在于, 所述同步参考 信号为同步跟踪参考信号。
13、 根据权利要求 1-12任一项所述的方法, 其特征在于,
当所述基站所在的系统为长期演进时分双工 LTE TDD系统时 ,所述用于 站间同步的同步参考信号位于特殊子帧内的保护时隙内; 或者,
当所述基站所在的系统为长期演进 LTE系统时, 所述用于站间同步的同 步参考信号位于广播多播 MBSFN子帧内。
14、 一种基站, 其特征在于, 包括:
确定模块, 用于确定自身的同步状态, 所述同步状态包括: 被同步基站, 或者, 同步源基站;
配置模块, 用于根据自身的同步状态配置所述基站的同步参考信号, 使 得第一时刻与第二时刻不同, 所述第一时刻为所述基站的同步参考信号所在 的时刻, 所述第二时刻为所述基站的同步源基站的用于站间同步的同步参考 信号所在的时刻。
15、根据权利要求 14所述的基站,其特征在于,所述配置模块具体用于: 当所述基站为同步源基站时, 配置所述基站的同步参考信号包括位于不 同时刻的所述基站的用户设备 UE下行同步参考信号和所述基站的站间同步 参考信号, 且所述基站的 UE下行同步参考信号与所述基站的同步源的站间 同步参考信号位于不同的时刻, 以及所述基站的站间同步参考信号与所述基 站的同步源的站间同步参考信号位于不同的时刻;
当所述基站为被同步基站时, 配置所述基站的同步参考信号包括所述基 站的 UE下行同步参考信号,且所述基站的 UE下行同步参考信号与所述基站 的同步源的站间同步参考信号位于不同的时刻;
所述基站的同步源的站间同步参考信号为所述基站的同步源的同步参考 信号中用于站间同步的同步参考信号。
16、 根据权利要求 15所述的基站, 其特征在于, 所述基站的同步源的同 步参考信号中还包括所述基站的同步源的 UE下行同步参考信号, 所述配置 模块还用于:
配置所述基站的 UE 下行同步参考信号与所述基站的同步源基站的 UE 下行同步参考信号位于相同的时刻。
17、 根据权利要求 15或 16所述的基站, 其特征在于, 所述 UE下行同 步参考信号与所述站间同步参考信号的如下参数项均相同或至少有一项不 同:
序列生成公式、 序列长度、 发射功率、 频域资源映射图案。
18、根据权利要求 14所述的基站,其特征在于,所述配置模块具体用于: 配置所述基站的同步参考信号与所述基站的同步源基站的同步参考信号 位于不同的时刻, 所述同步参考信号用于 UE下行同步以及站间同步。
19、 根据权利要求 15-18任一项所述的基站, 其特征在于, 所述配置模 块还用于:
当所述基站的同步等级与另一基站的同步等级不相同且差值小于预设的 大于 1 的阈值时, 配置所述基站的同步参考信号与所述另一基站的同步参考 信号位于不同的时刻; 或者,
当所述基站的同步等级与另一基站的同步等级的差值大于或等于预设的 大于 1 阈值时, 配置所述基站的同步参考信号与所述另一基站的同步参考信 号位于相同的时刻; 或者,
当所述基站的同步等级与另一基站的同步等级相同时, 配置所述基站的 同步参考信号与所述另一基站的同步参考信号位于相同或不同的时刻。
20、 根据权利要求 19所述的基站, 其特征在于, 当所述基站的同步参考 信号与同步等级相同的另一基站的同步参考信号位于相同的时刻时, 所述配 置模块还用于:
配置所述基站的同步参考信号与所述另一基站的同步参考信号釆用相互 正交的序列; 或者,
配置所述基站的同步参考信号与所述另一基站的同步参考信号釆用相同 的序列。
21、 根据权利要求 14-18任一项所述的基站, 其特征在于, 所述确定模 块具体用于:
当所述基站接收到其它基站发送的通知信令后,确定自身为同步源基站; 当所述基站没有接收到其它基站发送的通知信令时, 确定自身为被同步 基站;
所述其它基站为将所述基站作为同步源基站的基站。
22、 根据权利要求 21所述的基站, 其特征在于, 所述同步状态还包括同 步等级, 所述确定模块还用于:
当所述基站为同步源基站时, 根据所述基站的同步源基站的同步等级确 定自身的同步等级, 其中, 所述基站的同步等级与所述基站的同步源基站的 同步等级相差 1。
23、 根据权利要求 14-22任一项所述的基站, 其特征在于, 还包括: 更新模块, 用于定期检测同步获得参考信号, 并根据检测到的同步获得 参考信号重选所述基站的同步源基站; 或者, 在重选同步源基站后, 向重选 前的同步源基站发送用于译放同步关系的信令; 或者, 在作为同步源基站后 检测到自身的同步关系全部译放后, 将自身同步状态由同步源基站转移为被 同步基站; 或者, 所述基站在作为被同步基站后接收到其它基站发送的通知 信令后, 将自身同步状态由被同步基站转移为同步源基站, 所述其它基站为 将所述基站作为同步源基站的基站。
24、 根据权利要求 14-23任一项所述的基站, 其特征在于, 所述配置模 块还用于:
在接收所述基站的同步源基站的用于站间同步的同步参考信号所在的时 刻, 不发送所述基站所在小区的下行信号; 或者, 在接收所述基站的同步源基站的用于站间同步的同步参考信号所在的时 频位置, 不发送所述基站所在小区的下行信号。
25、 根据权利要求 14-24任一项所述的基站, 其特征在于, 所述同步参 考信号为同步跟踪参考信号。
26、 根据权利要求 14-25任一项所述的基站, 其特征在于,
当所述基站所在的系统为长期演进时分双工 LTE TDD系统时 ,所述用于 站间同步的同步参考信号位于特殊子帧内的保护时隙内; 或者,
当所述基站所在的系统为长期演进 LTE系统时, 所述用于站间同步的同 步参考信号位于广播多播 MBSFN子帧内。
27、 一种基站, 其特征在于, 包括:
处理器, 用于确定自身的同步状态, 所述同步状态包括: 被同步基站, 或者, 同步源基站以及同步等级; 以及, 根据自身的同步状态配置所述基站 的同步参考信号, 使得第一时刻与第二时刻不同, 所述第一时刻为所述基站 的同步参考信号所在的时刻, 所述第二时刻为所述基站的同步源基站的用于 站间同步的同步参考信号所在的时刻。
28、 根据权利要求 27所述的基站, 其特征在于, 所述处理器具体用于: 当所述基站为同步源基站时, 配置所述基站的同步参考信号包括位于不 同时刻的所述基站的用户设备 UE下行同步参考信号和所述基站的站间同步 参考信号, 且所述基站的 UE下行同步参考信号与所述基站的同步源基站的 站间同步参考信号位于不同的时刻, 以及所述基站的站间同步参考信号与所 述基站的同步源基站的站间同步参考信号位于不同的时刻;
当所述基站为被同步基站时, 配置所述基站的同步参考信号包括所述基 站的 UE下行同步参考信号,且所述基站的 UE下行同步参考信号与所述基站 的同步源基站的站间同步参考信号位于不同的时刻;
所述基站的同步源基站的站间同步参考信号为所述基站的同步源基站的 同步参考信号中用于站间同步的同步参考信号。
29、 根据权利要求 28所述的基站, 其特征在于, 所述基站的同步源基站 的同步参考信号中还包括所述基站的同步源基站的 UE下行同步参考信号, 所述处理器还用于:
配置所述基站的 UE 下行同步参考信号与所述基站的同步源基站的 UE 下行同步参考信号位于相同的时刻。
30、 根据权利要求 28或 29所述的基站, 其特征在于, 所述 UE下行同 步参考信号与所述站间同步参考信号的如下参数项均相同或至少有一项不 同:
序列生成公式、 序列长度、 发射功率、 频域资源映射图案。
31、 根据权利要求 27所述的基站, 其特征在于, 所述处理器具体用于: 配置所述基站的同步参考信号与所述基站的同步源基站的同步参考信号 位于不同的时刻, 所述同步参考信号用于 UE下行同步以及站间同步。
32、 根据权利要求 28-31 任一项所述的基站, 其特征在于, 所述处理器 还用于:
当所述基站的同步等级与另一基站的同步等级不相同且差值小于预设的 大于 1 的阈值时, 配置所述基站的同步参考信号与所述另一基站的同步参考 信号位于不同的时刻; 或者,
当所述基站的同步等级与另一基站的同步等级的差值大于或等于预设的 大于 1 阈值时, 配置所述基站的同步参考信号与所述另一基站的同步参考信 号位于相同的时刻; 或者,
当所述基站的同步等级与另一基站的同步等级相同时, 配置所述基站的 同步参考信号与所述另一基站的同步参考信号位于相同或不同的时刻。
33、 根据权利要求 32所述的基站, 其特征在于, 当所述基站的同步参考 信号与同步等级相同的另一基站的同步参考信号位于相同的时刻时, 所述处 理器还用于:
配置所述基站的同步参考信号与所述另一基站的同步参考信号釆用相互 正交的序列; 或者,
配置所述基站的同步参考信号与所述另一基站的同步参考信号釆用相同 的序列。
34、 根据权利要求 27-31任一项所述的基站, 其特征在于, 还包括: 收发器, 用于接收其它基站发送的通知信令;
所述处理器具体用于在所述收发器接收到其它基站发送的通知信令后, 确定自身为同步源基站; 或者, 在所述收发器没有接收到其它基站发送的通 知信令后, 确定自身为被同步基站; 所述其它基站为将所述基站作为同步源基站的基站。
35、 根据权利要求 34所述的基站, 其特征在于, 所述同步状态还包括同 步等级, 所述处理器还用于:
当所述基站为同步源基站时, 根据所述基站的同步源基站的同步等级确 定自身的同步等级, 其中, 所述基站的同步等级与所述基站的同步源基站的 同步等级相差 1。
36、 根据权利要求 27-35任一项所述的基站, 其特征在于, 所述处理器 还用于:
定期检测同步获得参考信号, 并根据检测到的同步获得参考信号重选所 述基站的同步源基站; 或者, 在重选同步源基站后, 向重选前的同步源基站 发送用于译放同步关系的信令; 或者, 在作为同步源基站后检测到自身的同 步关系全部译放后, 将自身同步状态由同步源基站转移为被同步基站; 或者, 在作为被同步基站后接收到其它基站发送的通知信令后, 将自身同步状态由 被同步基站转移为同步源基站, 所述其它基站为将所述基站作为同步源基站 的基站。
37、 根据权利要求 27-36任一项所述的基站, 其特征在于, 所述处理器 还用于:
在接收所述基站的同步源基站的用于站间同步的同步参考信号所在的时 刻, 不发送所述基站所在小区的下行信号; 或者,
在接收所述基站的同步源基站的用于站间同步的同步参考信号所在的时 频位置, 不发送所述基站所在小区的下行信号。
38、 根据权利要求 27-37任一项所述的基站, 其特征在于, 所述同步参 考信号为同步跟踪参考信号。
39、 根据权利要求 27-38任一项所述的基站, 其特征在于,
当所述基站所在的系统为长期演进时分双工 LTE TDD系统时 ,所述用于 站间同步的同步参考信号位于特殊子帧内的保护时隙内; 或者,
当所述基站所在的系统为长期演进 LTE系统时, 所述用于站间同步的同 步参考信号位于广播多播 MBSFN子帧内。
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