WO2015000104A1 - 空口同步的方法、基站、控制装置及无线通信系统 - Google Patents

空口同步的方法、基站、控制装置及无线通信系统 Download PDF

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Publication number
WO2015000104A1
WO2015000104A1 PCT/CN2013/078574 CN2013078574W WO2015000104A1 WO 2015000104 A1 WO2015000104 A1 WO 2015000104A1 CN 2013078574 W CN2013078574 W CN 2013078574W WO 2015000104 A1 WO2015000104 A1 WO 2015000104A1
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Prior art keywords
base station
time difference
time
type
adjustment amount
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PCT/CN2013/078574
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English (en)
French (fr)
Inventor
胡军
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华为技术有限公司
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Application filed by 华为技术有限公司 filed Critical 华为技术有限公司
Priority to PCT/CN2013/078574 priority Critical patent/WO2015000104A1/zh
Priority to CN201380002418.XA priority patent/CN103797869B/zh
Publication of WO2015000104A1 publication Critical patent/WO2015000104A1/zh

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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

Definitions

  • the present invention relates to the field of wireless communications, and more particularly to an air interface synchronization method, a base station, a control device, and a wireless communication system.
  • LTE Long Term Evolution
  • HomNet Homgenous Network
  • HomNet Heterogeneous Network
  • the staggered user resources can solve the inter-cell interference problem.
  • the existing approach is to use inter-cell time domain interference coordination to achieve inter-cell interference stagger by coordinating the use of subframes between different cells. Specifically, it is implemented by Almost Blank Subframes (ABS) technology.
  • ABS subframe does not transmit data at all, and only the reference signal is transmitted.
  • the premise of realizing inter-cell time domain interference coordination is time synchronization between cells.
  • the usual practice is to use the Global Positioning System (GPS) for inter-cell time synchronization, which requires GPS to be configured at each site.
  • GPS Global Positioning System
  • This synchronization technique using GPS is called hard synchronization technology.
  • Time synchronization using GPS has the problems of high construction cost and high maintenance cost.
  • the present invention provides a processing method, a device, and a method for realizing air interface time synchronization between base stations.
  • the line communication system solves the problems of high construction cost and high maintenance cost existing in the existing time synchronization between base stations by using GPS.
  • a device for centralizing a controller comprising:
  • a first type of time difference obtaining unit configured to acquire at least one first type time difference, where the at least one first type time difference includes a first time difference, where the first time difference is a first UE according to handover between the first base station and the second base station Time difference of non-contention random access acquisition;
  • a time adjustment amount processing unit configured to acquire a time adjustment amount of the second base station according to the at least one first type time difference and a reference time of the first base station, where the first base station is a reference base station, and the second base station is a non-reference base station;
  • an adjustment amount sending unit configured to send the time adjustment amount acquired by the time adjustment amount processing unit to the second base station, so that the second base station performs time adjustment according to the time adjustment amount.
  • the time adjustment amount processing unit is configured to acquire a time adjustment amount of the second base station according to the at least one first type time difference and the reference time of the first base station , including:
  • the time difference of the at least one first type is accurate, acquiring a time adjustment amount of the second base station according to the at least one first type time difference and a reference time of the first base station.
  • the method further includes: a second type time difference obtaining unit, configured to: when the time adjustment amount processing unit determines that the at least one first type time difference is inaccurate Obtaining at least one second type time difference, where the at least one second type time difference includes a second time difference, where the second time difference is a time difference acquired by using an active random access of the second UE;
  • the time adjustment amount processing unit is configured to acquire a time adjustment amount of the second base station according to the at least one first type time difference and the reference time of the first base station, and the method includes:
  • the acquired time difference is accurate, according to the acquired time difference and the first base station Obtaining a time adjustment amount of the second base station, where the acquired time difference includes at least one first type time difference acquired by the first type time difference acquisition unit and the second type time difference acquisition unit acquires Said at least one second type of time difference.
  • a method for processing a centralized controller in air interface synchronization comprising:
  • the centralized controller acquires at least one first type time difference, where the at least one first type time difference includes a first time difference, where the first time difference is a non-contention random connection according to the first UE that is switched between the first base station and the second base station Time difference between acquisition and acquisition;
  • the centralized controller acquires a time adjustment amount of the second base station according to the at least one first type time difference and the reference time of the first base station, where the first base station is a reference base station, and the second base station is a non-reference base station;
  • the centralized controller transmits the time adjustment amount to the second base station, so that the second base station performs time adjustment according to the time adjustment amount.
  • the centralized controller acquires a time adjustment amount of the second base station according to the at least one first type time difference and the reference time of the first base station, including:
  • the centralized controller acquires a time adjustment amount of the second base station according to the at least one first type time difference and the reference time of the first base station.
  • the centralized controller acquires at least one second type time difference, the at least one The second type time difference includes a second time difference, where the second time difference is a time difference obtained by using the active random access of the second UE;
  • a device for centralizing a controller comprising:
  • the interface is used for information interaction with the base station
  • the memory is used to store the program code, and the processor calls the program code stored in the memory for performing the processing method of the centralized controller in the air interface synchronization.
  • a device for a base station comprising:
  • a first type of time difference obtaining unit configured to acquire at least one first type time difference, where the at least one first type time difference includes a first time difference, where the first time difference is a first UE according to handover between the first base station and the second base station Time difference of non-contention random access acquisition;
  • a time adjustment amount processing unit configured to acquire a time adjustment amount of the non-reference base station according to the at least one first type time difference and a reference time of the reference base station, where the reference base station is the second base station, the non-reference The base station is the first base station, or the reference base station is the first base station, and the non-reference base station is the second base station;
  • an adjustment amount sending unit configured to send the time adjustment amount acquired by the time adjustment amount processing unit to the non-reference base station, so that the non-reference base station performs time adjustment according to the time adjustment amount.
  • the time adjustment amount processing unit is configured to acquire a time adjustment amount of the non-reference base station according to the at least one first type time difference and a reference time of the reference base station, Includes:
  • the at least one first type time difference is accurate, acquiring a time adjustment amount of the non-reference base station according to the at least one first type time difference and a reference time of the reference base station.
  • the method further includes: a second type time difference obtaining unit, configured to: when the time adjustment amount processing unit determines that the at least one first type time difference is inaccurate Obtaining at least one second type time difference, the at least one second type time difference includes a second time difference, where the second time difference is using the second UE Time difference of active random access acquisition;
  • the time adjustment amount processing unit is configured to acquire a time adjustment amount of the non-reference base station according to the at least one first type time difference and the reference time of the reference base station, and the method includes:
  • a method for processing a base station in air interface synchronization includes: acquiring, by the second base station, at least one first type time difference, where the at least one first type time difference includes a first time difference, the first time difference a time difference obtained by non-contention random access of the first UE that is handed over between the first base station and the second base station;
  • the second base station acquires a time adjustment amount of the non-reference base station according to the at least one first type time difference and the reference time of the reference base station, where the reference base station is the second base station, and the non-reference base station is The first base station, or the reference base station is the first base station, and the non-reference base station is the second base station;
  • the second base station transmits the time adjustment amount to the non-reference base station, so that the non-reference base station performs time adjustment according to the time adjustment amount.
  • the second base station acquires a time adjustment amount of the non-reference base station, including:
  • the second base station acquires a time adjustment amount of the non-reference base station according to the at least one first type time difference and the reference time of the reference base station.
  • the method further includes: when the at least one first type time difference is inaccurate, the second base station acquires at least one second type time difference, At least one second type time difference includes a second time difference, The second time difference is a time difference obtained by using the active random access of the second UE; when the acquired time difference is accurate, acquiring the time adjustment of the non-reference base station according to the acquired time difference and the reference time of the reference base station And the acquired time difference includes the at least one first type time difference and the at least one second type time difference.
  • a device for a base station comprising:
  • the interface is used for information interaction between base stations or information exchange between the base station and the core network or for information interaction with the centralized controller;
  • the transceiver is used for information interaction with the user equipment
  • the memory is used to store the program code, and the processor calls the program code stored in the memory to perform the processing method of the base station in the air interface synchronization.
  • the embodiment of the present invention uses the user.
  • the active random access of the device further acquires a second type of time difference between the base stations. Obtaining a time adjustment amount of the non-reference base station according to the acquired time difference and the reference time of the reference base station, so that the non-reference base station performs time adjustment according to the time adjustment amount, and time synchronization between the non-reference base station and the reference base station is implemented.
  • the air interface synchronization method does not require expensive synchronous equipment, reduces construction and maintenance costs, and achieves economical and convenient technical effects.
  • FIG. 1 is a schematic diagram of a wireless communication network according to an embodiment of the present invention
  • FIG. 2 is a schematic structural diagram of an apparatus for synchronizing an air interface according to an embodiment of the present invention
  • FIG. 3 is a processing method of a centralized controller in an air interface synchronization according to an embodiment of the present invention
  • FIG. 4 is an air interface synchronization provided by an embodiment of the present invention.
  • the processing method of the base station is a processing method of the base station in the air interface synchronization provided by the embodiment of the present invention
  • 6 is a method for performing time difference acquisition by using an inter-station switching mode according to an embodiment of the present invention
  • FIG. 7 is another method for performing time difference acquisition by using an inter-station switching mode according to an embodiment of the present invention
  • FIG. 8 is a method for performing time difference acquisition by using active random access of a UE according to an embodiment of the present invention.
  • FIG. 9 is a method for performing time difference processing using a timer according to an embodiment of the present invention.
  • FIG. 10 is another processing method of a base station in an air interface synchronization scheme according to an embodiment of the present invention;
  • FIG. 11 is an air interface synchronization according to an embodiment of the present invention. Another processing method of the second base station in the solution;
  • FIG. 12 is a schematic structural diagram of another base station according to an embodiment of the present disclosure.
  • FIG. 13 is a schematic diagram of a device for a centralized controller according to an embodiment of the present invention.
  • FIG. 14 is a schematic diagram of a device of a base station according to an embodiment of the present disclosure.
  • FIG. 15 is a schematic diagram of a device of a base station according to an embodiment of the present disclosure.
  • FIG. 16 is a schematic diagram of another apparatus of a base station according to an embodiment of the present disclosure.
  • FIG. 17 is a schematic diagram of another apparatus of a base station according to an embodiment of the present invention.
  • FIG. 1 is a schematic diagram of a wireless communication network 100 according to an embodiment of the present invention. It is thought to be a Long Term Evolution (LTE) network, or an LTE-Advanced network.
  • the wireless communication network includes a number of base stations (e.g., 102a, 102b, 102c, 102d, etc.), a centralized controller 101, and other network entities (e.g., a core network that is not embodied in Figure 1) to support a number of user equipment (e.g., 103a, 103b, 103c, etc.) communicate.
  • base stations e.g., 102a, 102b, 102c, 102d, etc.
  • other network entities e.g., a core network that is not embodied in Figure 1
  • user equipment e.g., 103a, 103b, 103c, etc.
  • the base station 102 is an evolved NodeB (eNodeB) in LTE.
  • eNodeB evolved NodeB
  • a base station can support/manage one or more cells, each base station can serve multiple UEs, and the UE selects one cell to initiate network access and performs voice and/or data services with the base station 102.
  • UE User Equipment
  • MT Mobile Terminal
  • MS Mobile Station
  • a base station may be selected, and the base station is used as a reference point, and the time of adjusting other base stations is kept consistent with the time of the base station, and the base station selected as a reference point is referred to as a reference base station, and other base stations are referred to as non-references. Base station.
  • the centralized controller 101 can perform information interaction with each base station. Obtaining at least one time difference between the base stations, acquiring a time adjustment amount of the non-reference base station relative to the reference base station according to the at least one time difference and the reference time of the reference base station, and transmitting the time adjustment amount to the non-reference base station, so that the non-reference base station adjusts according to the time Time adjustment is made to keep time synchronized with the base station.
  • the centralized controller 101 can be independent of the base station, as an independent network element, or can be located in a certain base station as a functional entity of the base station.
  • the system uses the time of the reference base station as the reference time, and the other base stations are non-reference base stations. When the time of the non-reference base station deviates from the reference time, the time of the non-reference base station is adjusted to keep the non-reference base station and the reference base station time synchronized.
  • FIG. 3 is a processing method of a centralized controller in an air interface synchronization scheme according to an embodiment of the present invention, and is described in detail below.
  • the centralized controller acquires at least one first type time difference and determines whether the at least one first type time difference is accurate. If the acquired at least one first type time difference is inaccurate, acquiring at least one second type time difference and determining whether the acquired time difference is accurate , if obtained If the difference is accurate, the time adjustment amount of the non-reference base station is acquired according to the acquired time difference and the reference time of the reference base station, and the time adjustment amount is sent to the non-reference base station, where the acquired time difference includes at least one first type time difference and at least one Two types of time difference.
  • At least one first type time difference where the at least one first type time difference includes a first time difference, where the first time difference is a time difference obtained according to the non-contention random access acquired by the first UE that is handed over between the first base station and the second base station.
  • the centralized controller acquires at least one first type time difference between the first base station and the second base station, and the first type time difference is a time difference obtained by using the non-contention random access of the handover UE between the first base station and the second base station.
  • the first time difference is a time difference obtained by switching the non-contention random access of the first UE between the first base station and the second base station, and the first time difference belongs to the first type time difference.
  • the first time difference may be a time difference calculated according to the first receiving time and the second receiving time, where the first receiving time is a time when the first base station detects the first random access preamble, and the second receiving time is the second base station detecting the second time A moment of random access preamble.
  • the first random access preamble is a non-contention random access preamble for the first UE to perform handover between the first base station and the second base station.
  • the centralized controller acquires the first time difference according to the non-contention random access of the first UE that is handed over between the first base station and the second base station.
  • the first UE When the first UE is handed over from the first base station to the second base station, the first UE initiates non-contention random access according to the non-contention random access, and the first base station and the second base station respectively detect the random connection.
  • the first base station may detect the non-contention random access preamble by initiating a random access preamble detection; the second base station sends the second receiving moment to the first base station; The base station acquires a first time difference between the first base station and the second base station according to the first receiving time and the second receiving time, and sends the first time difference to the centralized controller.
  • the centralized controller can acquire multiple first type time differences using the above process.
  • the first base station may further acquire a first transmission delay of the first UE to the first base station, and the second base station may also acquire a second transmission delay of the first UE to the second base station, where the first base station may be configured according to the first Acquiring a first base at a receiving time, a first transmission delay, a second receiving time, and a second transmission delay
  • the first time difference between the station and the second base station that is, the first time difference may be the time difference between the first base station and the second base station obtained according to the first receiving time, the first transmission delay, the second receiving time, and the second transmission delay .
  • the centralized controller may also acquire a first type of time difference between the base stations from the second base station.
  • the centralized controller acquires the time adjustment amount of the second base station according to the at least one first type time difference and the reference time of the first base station.
  • the centralized controller may determine whether the acquired time difference of the at least one first type is accurate, and determine that the acquired time difference of the at least one first type is accurate, including:
  • the at least one first type time difference is accurate.
  • the centralized controller acquires at least one second type time difference, the at least one second type time difference includes a second time difference, and the second time difference is a time difference obtained by using the active random access of the second UE.
  • the centralized controller may send a time difference request message to the first base station and/or the second base station to acquire at least one second type time difference between the first base station and the second base station.
  • the centralized controller may send a time difference request message to the first base station, so that the first base station selects the second UE according to the time difference request message, and obtains the second time difference by using the active random access of the second UE, where the second time difference belongs to the second type time difference.
  • the first base station according to the third receiving moment The second time difference is calculated by the fourth base station, and the third time is the time when the first base station detects the third random access preamble, and the fourth time is the time when the second base station detects the third random access preamble.
  • the third random access preamble is a non-contention random access preamble for active random access by the second UE.
  • the centralized controller acquires a second time difference according to the active random access of the second UE.
  • the centralized controller may periodically send a time difference request message to the first base station, or may send a time difference request message to the first base station according to the first base station load condition or service condition, and may also send a time difference request message to the first base station according to the system requirements. Sending a time difference request message to the first base station.
  • the centralized controller may also send a time difference request message to the second base station, and obtain a second type time difference by using the active random access of the UE by the second base station.
  • the time adjustment amount of the second base station is obtained according to the acquired time difference and the reference time of the first base station.
  • the centralized controller processes the acquired time difference to obtain an average time difference between the second base station and the first base station or an average time difference between the first base station and the second base station, and the acquired time difference may be only the at least one first type time difference, or may be Is the at least one first type time difference and the at least one second type time difference.
  • the reference base station is the first base station
  • the second base station is the non-reference base station
  • the centralized controller acquires the time of the second base station relative to the first base station according to the reference time of the first base station and a time difference acquired.
  • the adjustment amount is obtained by acquiring the time adjustment amount of the non-reference base station relative to the reference base station.
  • the centralized controller processes the acquired time difference.
  • the above processing includes averaging processing, or averaging the two time differences with the smallest difference, or removing the maximum and minimum values of the multiple time differences, and then The remaining time difference is averaged.
  • the centralized controller acquires the time adjustment amount of the second base station relative to the first base station according to the reference time of the first base station and the processed time difference, that is, acquires the time adjustment amount of the non-reference base station relative to the reference base station.
  • S303 Send a time adjustment amount to the second base station.
  • the centralized controller acquires the time adjustment amount of the non-reference base station relative to the reference base station, the time adjustment amount is sent to the non-reference base station, so that the non-reference base station performs time adjustment according to the time adjustment amount, and keeps time synchronization with the reference base station.
  • the reference base station is the first base station, and the centralized controller transmits the time adjustment amount to the second base station, so that the second base station performs time adjustment according to the time adjustment amount to complete time synchronization.
  • the above-mentioned execution subject is a base station.
  • FIG. 4 is a processing method of a first base station in an air interface time synchronization scheme according to an embodiment of the present invention, and is described in detail below.
  • S401 Obtain a first time difference according to the non-contention random access of the first UE that is handed over between the first base station and the second base station, where the first base station is a reference base station, and the second base station is a non-reference base station.
  • the first base station and the second base station respectively detect a random access preamble acquisition and receiving time of the first UE, and the first base station receives the received according to the acquisition.
  • the first time difference is calculated at any time.
  • the first time difference belongs to the first type of time difference.
  • the first time difference may be a time difference obtained according to the first receiving time and the second receiving time, where the first receiving time is a time when the first base station detects the first random access preamble, and the second receiving time is the second base station detecting the first time The moment when the preamble is randomly accessed.
  • the second base station is the target base station of the first UE, and can detect the first random access preamble to obtain the second receiving moment; the first base station starts the random access preamble detection, and can also detect the first random access preamble to obtain the first receiving. time.
  • the first base station receives the second receiving moment sent by the second base station, and the first base station calculates a first time difference between the first base station and the second base station according to the first receiving moment and the second receiving moment.
  • the first base station may further acquire a first transmission delay of the first UE to the first base station, and the second base station may also acquire a second transmission delay of the first UE to the second base station, where the first base station may be configured according to the first
  • a first time difference between the first base station and the second base station is calculated by a reception time, a first transmission delay, a second reception time, and a second transmission delay.
  • the first base station transmits the first time difference to the centralized controller.
  • the first base station sends the first time difference to the centralized controller, so as to centrally determine the controller. Whether the at least one first type time difference obtained by the break is accurate, and the at least one first type time difference includes the first time difference.
  • the centralized controller determines that the acquired time difference of the at least one first type is inaccurate, the centralized controller acquires the second type time difference by using an active control manner, and if it is determined that the acquired time difference of the at least one first type is accurate, the centralized controller acquires the time difference Process it.
  • the first base station receives the time difference request message sent by the centralized controller, the first base station acquires a second time difference between the first base station and the second base station by using the active random access of the second UE.
  • the centralized controller determines that the acquired time difference of the at least one first type is inaccurate, if the first base station receives the time difference request message sent by the centralized controller, the first base station selects the second UE, and uses the active random access of the second UE to obtain The second time difference.
  • the second time difference belongs to the second type of time difference.
  • the third random access preamble is allocated to the second UE, and the third random access preamble is detected to obtain the third receiving time, and the first base station calculates according to the third receiving time and the fourth receiving time. a second time difference between the first base station and the second base station, and sending the second time difference to the centralized controller, where the fourth receiving time is a time at which the second base station detects the third random access preamble.
  • the third random access preamble is a non-contention random access preamble, so that the second UE directs the first base station to initiate active random access by using the third random access.
  • the first base station determines, according to the downlink signal strength of the first base station measured by the second UE, and the downlink signal strength of the second base station, when the downlink signal strength of the first base station of the second UE is lower than the downlink of the second base station.
  • the second UE is selected.
  • the first base station sends the second time difference to the centralized controller, so that the centralized controller determines that the acquired time difference is accurate, and the centralized controller acquires the time adjustment amount of the second base station according to the acquired time difference and the reference time of the first base station.
  • the acquired time difference includes the at least one first type time difference and the at least one second type
  • the time difference, the at least one second type time difference includes a second time difference.
  • the centralized controller determines the time difference obtained by the above, and if it is determined that the acquired time difference is accurate, the time adjustment amount of the second base station is acquired according to the acquired time difference and the reference time of the first base station.
  • FIG. 5 is a processing method of a second base station in an air interface time synchronization scheme according to an embodiment of the present invention, and is described in detail below.
  • the second base station acquires a time adjustment amount sent by the centralized controller.
  • the second base station receives the time adjustment amount sent by the centralized controller, and the time adjustment amount is that the centralized controller acquires the time adjustment amount of the second base station relative to the first base station according to the acquired time difference and the reference time of the first base station.
  • the acquired time difference may be at least one first type time difference, or may be at least one first type time difference and at least one second type time difference.
  • the acquired time difference is the at least one first type time difference, and the at least one first type time difference includes a first time difference, where the first time difference is according to the first base station and the second base station.
  • the second type of time difference, the at least one second type time difference includes a second time difference, and the second time difference is a time difference obtained by using the active random access of the second UE.
  • the second base station performs time adjustment according to the time adjustment amount.
  • the second base station performs time adjustment according to the acquired time adjustment amount, and completes time synchronization.
  • the processing method of the centralized controller, the processing method of the first base station, and the processing method of the second base station are also applicable to the time difference request message that the second base station receives the centralized controller.
  • the second base station is a reference base station, and the first base station is a non-reference base station, and the above processing method is also applicable.
  • the non-contention random access procedure of the user equipment switched between the base stations is used to obtain the first type time difference between the base stations through the signaling interaction, the system requirements are not met, and the active random access of the user equipment is further used.
  • the second type of time difference between base stations. According to the obtained The time difference and the reference time of the reference base station acquire the time adjustment amount of the non-reference base station, so that the non-reference base station performs time adjustment according to the time adjustment amount, and realizes time synchronization between the non-reference base station and the reference base station.
  • the air interface synchronization method does not require expensive synchronous equipment, reduces construction and maintenance costs, and achieves economical and convenient technical effects.
  • the non-contention random access (inter-station switching mode acquisition time difference) of the UE that is switched between the base stations is used, and the centralized controller acquires the first type time difference between the base stations.
  • the centralized controller sends a time difference request message to the first base station or the second base station, and the first base station or the second base station selects the UE to initiate active random access (active control mode acquisition time difference). Further obtaining a second type of time difference between the base stations.
  • FIG. 6 is a method for performing time difference acquisition by using an inter-station switching mode according to an embodiment of the present invention, and is described as follows.
  • the first base station selects a second base station as the target base station according to the neighboring cell measurement report of the first UE, and sends a handover request message to the second base station.
  • the second base station After receiving the handover request message sent by the first base station, the second base station sends a handover request acknowledgement message to the first base station, so that the first base station starts the random access preamble detection, and the handover request acknowledgement message carries the second base station as the first An index of the first random access preamble allocated by the UE, where the first random access preamble is a non-contention random access preamble for the first UE to perform handover between the first base station and the second base station.
  • the first base station after receiving the handover request acknowledgement message sent by the second base station, the first base station starts random access preamble detection.
  • the first base station sends a handover command message to the first UE, where the handover command message carries an index of the first random access preamble allocated by the second base station to the first UE.
  • the first base station starts the random access preamble detection.
  • the first base station does not need to detect the first random access preamble.
  • the first base station needs to be first. Random access preamble detection.
  • the first UE After receiving the handover command message sent by the first base station, the first UE uses the index of the first random access preamble allocated by the second base station to the first UE according to the handover command message, and uses the first random access pre-guided The second base station initiates random access.
  • the index of the first random access preamble corresponds to the first random access preamble.
  • the first base station may also detect the random access preamble that the first UE initiates the random access to the second base station, because the first base station initiates the random access preamble detection.
  • the first base station detects a random access preamble, and acquires a first receiving moment, where the first receiving moment is a moment when the first base station detects the first random access preamble.
  • the second base station detects a random access preamble, and acquires a second receiving moment, where the second receiving moment is a time when the second base station detects the first random access preamble. There is no specific order between step S606 (a) and step S606 (b).
  • the second base station sends the second receiving moment to the first base station, so that the first base station acquires the second receiving moment.
  • the second base station sends a user resource release message to the first base station, and carries the second receiving time in the user resource release message.
  • the first base station acquires the second receiving moment.
  • the first base station receives the second base station sending the resource release message, and acquires the second receiving moment according to the user resource release message.
  • the first base station calculates a first time difference between the first base station and the second base station according to the first receiving time and the second receiving time.
  • the index of the first random access preamble is carried, and the first base station compares the index of the random access preamble corresponding to the first receiving moment with the second receiving time before calculating the first time difference.
  • the index of the random access preamble if the same, calculates the first time difference.
  • the first time difference between the first base station and the second base station is calculated as follows:
  • First time difference (second receiving time - first receiving time); or
  • First time difference (first receiving time - second receiving time).
  • the present invention does not limit the calculation method of the time difference between the first base station and the second base station, as long as It is sufficient to ensure that the time difference is calculated in the same manner, for example, the time difference between the first base station and the second base station is calculated.
  • FIG. 7 is still another method for performing time difference acquisition by using the inter-station switching mode according to an embodiment of the present invention, which is described below.
  • the first base station selects a second base station as the target base station according to the neighboring cell measurement report of the first UE, and sends a handover request message to the second base station.
  • the first base station After the first base station sends a handover request message to the second base station, triggering the first UE to initiate random access, that is, triggering the first UE to perform uplink resynchronization. Specifically, the first base station sends a Physical Downlink Control Channel Order (PDCCH Order) to the first UE, where the PDCCH Order carries an index of the second random access preamble allocated by the first base station to the first UE.
  • PDCCH Order Physical Downlink Control Channel Order
  • the first UE After receiving the PDCCH Order, the first UE initiates random access according to the second random access pre-directed first base station corresponding to the index of the second random access preamble carried in the PDCCH Order.
  • the first base station performs a random access preamble detection.
  • the first base station is the access base station of the first UE at this time.
  • the first base station acquires the first UE to the first base station.
  • the first transmission delay is the delay.
  • the second base station After receiving the handover request message sent by the first base station, the second base station sends a handover request acknowledgement message to the first base station, where the handover request acknowledgement message carries the index of the first random access preamble allocated by the second base station to the first UE. .
  • the first base station after receiving the handover request acknowledgement message sent by the second base station, the first base station starts random access preamble detection.
  • the first base station sends a handover command message to the first UE, where the handover command message carries an index of the first random access preamble allocated by the second base station to the first UE.
  • the first UE After the first UE receives the handover command message sent by the first base station, the first UE uses the index of the first random access preamble allocated by the second base station to the first UE according to the handover command message, and uses the first random identifier. Before the machine accesses, the second base station is directed to initiate random access.
  • the first base station detects a random access preamble, and acquires a first receiving moment, where the first receiving moment is a moment when the first base station detects the first random access preamble.
  • the second base station detects and detects a random access preamble, and may acquire a second receiving moment and a second transmission delay of the first UE to the second base station, where the second receiving moment is that the second base station detects the first random connection. Enter the moment of the lead.
  • the second base station sends the second receiving time and the second transmission delay to the first base station, so that the first base station acquires the second receiving time and the second transmission delay, and the second transmission delay is the first UE to the second.
  • the transmission delay of the base station Preferably, after the first UE switches to the second base station, the second base station sends a user resource release message to the first base station, where the user resource release message carries the second receiving time and the second transmission delay.
  • the first base station acquires the second receiving time and the second transmission time delay.
  • the first base station receives the second base station to send the resource release message, and obtains the second receiving time and the second transmission time delay according to the user resource release message.
  • the first base station calculates a first time difference between the first base station and the second base station according to the first receiving time, the first transmission delay, the second receiving time, and the second transmission delay.
  • the first random access preamble index is carried, and the first base station compares the random access preamble index corresponding to the first receiving time and the second receiving time, before calculating the first time difference. Random access preamble index, if the same, calculate the time difference.
  • first time difference (first reception time - second reception time) - (first transmission delay - second transmission delay).
  • the first time difference between the first base station and the second base station is calculated as follows:
  • First time difference between the first base station and the second base station (second reception time - first reception time)
  • first time difference (first reception time - first Second receiving time) + (first transmission delay - second transmission delay).
  • the calculation of the time difference between the first base station and the second base station is consistent in each base station, for example, the time difference of the first base station relative to the second base station is calculated.
  • the first receiving time and the second receiving time include a system frame number, a subframe number, and a sub-frame offset.
  • the above process is based on X2 switching, and when it is switched based on S1, its processing is similar to X2 switching.
  • the first base station acquires the first time difference according to the non-contention random access of the first UE switched between the first base station and the second base station.
  • the first time difference belongs to the first type time difference, and the first type time difference is the time difference obtained by the inter-station switching mode.
  • the first base station sends the first time difference to the centralized controller. Specifically, the first base station sends a time difference report to the centralized controller, where the time difference report includes an identifier of the first base station, an identifier of the second base station, and a first time difference, where the identifier is used to identify the base station.
  • the sequence of the identifier is used to indicate that the first time difference in the time difference report is a time difference of the first base station relative to the second base station, or the first time difference is the second base station relative to the first The time difference of a base station.
  • the first base station acquires a plurality of time differences according to the above method.
  • the first base station may send, by using another custom message, the first receiving time or the first receiving time and the first transmission time delay to the second base station, where the second base station acquires between the first base station and the second base station.
  • the first time difference is reported by the second base station to the centralized controller, or the second base station sends the acquired first time difference to the first base station, and is reported by the first base station to the centralized controller.
  • the first base station uniformly reports the multiple time differences to the centralized controller by using the time difference report.
  • the time difference report includes the identifier of the first base station, the identifier of the second base station, and the Time difference.
  • the first base station may acquire the first type time difference according to the foregoing method at any time, and may also acquire the first type time difference in a certain time period.
  • the centralized controller may acquire the first type of time difference between the first base station and the second base station by using the second base station.
  • the centralized controller uses the non-contention random access of the UE between the first base station and the second base station, acquires at least one first type time difference between the first base station and the second base station, and the at least one first type time difference includes the first Time difference.
  • the centralized controller determines whether the acquired at least one first type time difference is accurate. If accurate, the centralized controller acquires a non-reference according to at least one first type time difference between the first base station and the second base station and a reference time of the reference base station. The time adjustment amount of the base station relative to the reference base station, when the reference base station is the first base station, the second base station is a non-reference base station, or when the reference base station is the second base station, the first base station is a non-reference base station.
  • the centralized controller acquires at least one second type time difference between the first base station and the second base station (the second type time difference is a time difference acquired by the active control mode, that is, a time difference obtained by the UE active random access) .
  • the centralized controller further determines whether the acquired time difference (including the acquired at least one first type time difference and the acquired at least one second type time difference) is accurate, and if accurate, the centralized controller according to the acquired time difference and the reference time of the reference base station Obtaining a time adjustment amount of the non-reference base station relative to the reference base station.
  • the centralized controller may obtain at least one second type time difference by using the active random access of the UE by the first base station, or may use the active random connection of the UE by using the second base station. Into at least one second type of time difference.
  • the centralized controller determines whether the acquired time difference is accurate or not:
  • the variance of the obtained time difference is obtained, and if the variance of the acquired time difference is less than the variance threshold, an accurate time difference is obtained; or Comparing the difference between the two pairs that have acquired the time difference, if the smallest difference is less than the minimum difference threshold, an accurate time difference is obtained.
  • FIG. 8 is a method for performing time difference acquisition by using active random access of a UE according to an embodiment of the present invention, and is described in detail as follows:
  • the centralized controller sends a time difference request message to the first base station, and the centralized controller may periodically send the time difference request message to the first base station, or may be based on the first base station load condition or service condition, when the first base station is relatively idle. Sending a time difference request message to the first base station, and sending a time difference request message to the first base station according to system requirements.
  • the first base station after acquiring the time difference request message sent by the centralized controller, the first base station selects the second, and the second UE is the UE that accesses the first base station.
  • the first base station may obtain the downlink RSRP of the first base station measured by the second UE, and the downlink RSRP of the second base station measured by the second UE, where the second base station is a neighboring base station of the first base station, when the first base station
  • the first base station considers that the second UE is an edge UE, that is, the second UE is in an overlapping area covered by the first base station and the second base station, and may be considered as the first
  • the second UE is selected to be equal to the first base station and the second base station, and the second UE is selected, that is, the difference between the downlink signal strength of the first base station measured by the first UE and the downlink signal strength of the second base station is lower than
  • the first threshold, the downlink signal strength may be a downlink reference signal received power (RSRP), and other measured values of the signal strength, such as a signal to interference plus noise ratio (SINR
  • the first base station allocates a third random access preamble for the selected second UE, and the third random access preamble is a non-contention random access preamble, so that the second UE uses the third random access pre-guided
  • a base station initiates active random access.
  • the first base station sends a third random access preamble to the second base station.
  • the second base station starts the random access preamble detection after acquiring the third random access preamble.
  • the second UE is the serving base station of the second UE, and the second base station is not the serving base station of the second UE.
  • the second The base station starts random access preamble detection according to the third random access preamble information acquired from the first base station.
  • the second base station starts the random access preamble detection.
  • the second base station does not need to detect the third random access preamble.
  • the second base station needs to perform the third random access. Into the preamble detection.
  • the second base station After the second base station starts the random access preamble detection, the second base station sends a random access preamble detection start success confirmation message to the first base station.
  • the first base station After receiving the random access preamble detection success confirmation message sent by the second base station, the first base station triggers the second UE to initiate random access, that is, triggers the second UE to perform uplink resynchronization. Specifically, the first base station sends a Physical Downlink Control Channel Order (PDCCH Order) to the second UE, where the PDCCH Order carries an index of the third random access preamble allocated by the first base station to the second UE.
  • PDCCH Order Physical Downlink Control Channel Order
  • the second UE After receiving the PDCCH order, the second UE initiates random access according to the third random access pre-directed first base station corresponding to the index of the third random access preamble carried in the PDCCH Order.
  • the first base station detects a third random access preamble, and acquires a third receiving moment, where the third receiving moment is a moment when the first base station detects the third random access preamble.
  • step S808 (b) the second base station detects the third random access preamble, and obtains a fourth receiving moment, where the fourth receiving moment is a time when the second base station detects the third random access preamble. There is no specific sequence between step S808 (a) and step S808 (b).
  • the second base station sends the fourth receiving moment to the first base station.
  • the first base station acquires a fourth receiving moment.
  • the first base station calculates a second time difference between the first base station and the second base station according to the third receiving time and the fourth receiving time.
  • the second base station sends the index of the third random access preamble to the first base station simultaneously, where the first base station compares the random access preamble corresponding to the third receiving moment before calculating the second time difference.
  • the index and the index of the random access preamble corresponding to the fourth receiving moment calculate the second time difference.
  • the second time difference is calculated as follows:
  • Second time difference (fourth receiving time - third receiving time), or,
  • the second time difference (third receiving time - fourth receiving time), as long as the calculation of the guaranteed time difference is consistent, for example, the time difference of the first base station relative to the second base station is calculated.
  • the first receiving time and the second receiving time include a system frame number, a subframe number, and a sub-frame offset.
  • the information exchange between the first base station and the second base station may be based on the X2 interface, or may be based on the S1 interface, and the existing interface message may be extended to carry the foregoing information, or a new interface message bearer may be constructed.
  • the above information may be based on the X2 interface, or may be based on the S1 interface, and the existing interface message may be extended to carry the foregoing information, or a new interface message bearer may be constructed.
  • the first base station acquires a second time difference between the first base station and the second base station according to the active random access of the second UE.
  • the first base station sends the second time difference to the centralized controller.
  • the first base station sends a time difference report to the centralized controller, where the time difference report includes an identifier of the first base station, an identifier of the second base station, and a second time difference, where the identifier is used to identify the base station.
  • the sequence of the identifier is used to indicate that the second time difference in the time difference report is a time difference of the first base station relative to the second base station, or the second time difference is the second base station relative to the first The time difference of a base station.
  • the processing procedure of the second base station is the same as the processing of receiving the time difference request by the first base station.
  • the detailed process of acquiring the time difference manner by the active control when the second base station receives the time difference request sent by the centralized controller is described below from the perspective of the second base station.
  • the centralized controller sends a time difference request message to the second base station, and after the second base station acquires the time difference request message sent by the centralized controller, the second UE is selected, and the second UE is the UE accessing the second base station.
  • the second base station allocates a third random access preamble to the selected second UE, and the third random access preamble is a non-contention random access preamble, so that the second UE initiates the active randomization by using the third random access pre-orientation to the second base station.
  • Access. The second base station sends the third random access preamble information to the first base station, and the first base station starts the random access preamble detection after acquiring the third random access preamble information. After the first base station starts the random access preamble detection, the first base station sends a random access preamble detection start success confirmation message to the second base station.
  • the second base station After receiving the random access preamble detection success confirmation message sent by the first base station, the second base station triggers the second UE to initiate random access, that is, triggers the second UE to perform uplink resynchronization. Specifically, the second base station sends, to the second UE, a PDCCH Order that carries an index of the third random access preamble.
  • the second base station detects the third random access preamble, and acquires a third receiving moment, where the third base station detects the third random access preamble.
  • the first base station detects the third random access preamble, and obtains a fourth receiving moment, where the fourth receiving moment is the moment when the first base station detects the third random access preamble.
  • the first base station transmits the fourth reception time to the second base station.
  • the second base station acquires a fourth receiving moment.
  • the second base station acquires a second time difference between the first base station and the second base station according to the third receiving time and the fourth receiving time.
  • the first base station sends the index of the third random access preamble to the second base station simultaneously, where the second base station compares the random access preamble corresponding to the third receiving moment before calculating the second time difference.
  • the index and the index of the random access preamble corresponding to the fourth receiving moment calculate the second time difference.
  • the second base station transmits the second time difference to the centralized controller.
  • the transmission method is the same as the manner in which the first base station transmits the time difference.
  • the centralized controller may send a plurality of time difference request messages to the first base station or the second base station to obtain a plurality of second type time differences.
  • the centralized controller obtains the time difference mode by using the active control, and obtains at least one second type time difference between the first base station and the second base station by using the active random access of the UE, and the at least one second type time difference includes the second time difference.
  • the central controller acquires multiple time differences between the first base station and the second base station by using the inter-station handover mode and the active control mode (including at least one first type time difference and at least one second type) Time difference), it is determined again whether the multiple time differences obtained above are accurate. If accurate, the centralized controller acquires the time adjustment amount of the non-reference base station relative to the reference base station according to the acquired multiple time differences and the reference time of the reference base station, when the reference base station When the first base station is the second base station, the second base station is a non-reference base station, or when the reference base station is the second base station, the first base station is a non-reference base station.
  • the centralized controller further acquires a second type of time difference between the first base station and the second base station.
  • the centralized controller can judge whether the time difference is accurate or not every time a second type time difference is acquired.
  • the centralized controller sets a first timer for the inter-station handover time difference manner, and sets a second timer for the active control acquisition time difference manner.
  • FIG. 9 is a method for performing time difference processing by using a timer provided by the embodiment of the present invention. After the first timer is started, the centralized controller obtains the first type of time difference between the first base station and the second base station by using the inter-station handover mode before the first timer expires. After the first timer expires, the second timer is started. The device determines whether the first type time difference obtained before the first timer expires is accurate.
  • the centralized controller processes the acquired time difference, and obtains the non-reference base station according to the acquired time difference and the reference time of the reference base station.
  • the time adjustment amount of the reference base station if not accurate, the time difference request message is sent to the first base station or the second base station, and the second type time difference is obtained by the active control mode until it is determined that the acquired time difference is accurate or the second timer expires. If the obtained first type time difference and the second type time difference are accurate, the centralized controller processes the acquired time difference, and obtains the time adjustment amount of the non-reference base station relative to the reference base station according to the obtained time difference and the reference time of the reference base station.
  • the length of the second timer can be preset to ensure that an accurate time difference can be obtained.
  • the second base station is a non-reference base station
  • the centralized controller acquires the time adjustment amount of the second base station relative to the first base station according to the acquired time difference and the reference time of the first base station, that is, the acquisition non- The amount of time adjustment of the base station relative to the base station.
  • the centralized controller processes the acquired time difference to obtain the second base station relative to The time difference of the first base station. For a case where there is only one time difference, the centralized controller can obtain the time adjustment amount of the second base station relative to the reference base station according to the time difference of the second base station relative to the first base station, that is, the time adjustment amount of the non-reference base station relative to the reference base station; In the case of multiple time differences, the centralized controller processes the time difference between the second base station and the first base station, and may specifically average the time difference or average the two time differences that minimize the difference, or remove at least a maximum value and a minimum value of a time difference, and averaging the remaining time differences to obtain a time difference of the second base station relative to the first base station, that is, an average time difference; and the centralized controller acquires the second base station according to the reference time of the reference base station. The amount of time adjustment of the reference base station, that is, the amount of time adjustment of the non-reference base station relative to the reference base station.
  • the centralized controller sends a time adjustment amount to the second base station, that is, sends a time adjustment amount to the non-reference base station. Specifically, the centralized controller sends a time adjustment command message to the first base station, where the time adjustment command message carries the time adjustment amount and the first The identity of the base station.
  • the centralized controller determines before sending the time adjustment amount to the second base station, and if the second base station, that is, the non-reference base station needs to perform time adjustment, the centralized controller sends the time adjustment amount to the second base station.
  • the second base station receives the time adjustment amount sent by the centralized controller, performs time adjustment according to the time adjustment amount, and completes time synchronization. Specifically, the second base station receives the time adjustment command message sent by the centralized controller, acquires the time adjustment amount, performs time adjustment according to the time adjustment amount, and completes time synchronization.
  • the first base station is a non-reference base station
  • the centralized controller acquires the time adjustment amount of the first base station relative to the second base station according to the acquired time difference and the reference time of the reference base station, so that the non-reference can be obtained.
  • the amount of time adjustment of the base station relative to the base station is the second base station.
  • the centralized controller transmits a time adjustment amount to the first base station, that is, transmits a time adjustment amount to the non-reference base station.
  • the first base station receives the time adjustment amount sent by the centralized controller, performs time adjustment according to the time adjustment amount, and completes time synchronization.
  • the non-contention random access process of the user equipment switched between the base stations is utilized,
  • the first type of time difference between the base stations cannot be met by the signaling interaction, and the second type of time difference between the base stations is further obtained by using the active random access procedure of the user equipment.
  • the time adjustment amount of the non-reference base station is obtained according to the acquired time difference and the reference time of the reference base station, so that the non-reference base station performs time adjustment according to the time adjustment amount, and time synchronization between the non-reference base station and the reference base station is implemented.
  • the air interface synchronization method does not require expensive synchronous equipment, reduces construction and maintenance costs, and achieves economical and convenient technical effects.
  • the centralized controller 101 is independent of the base station, and the base station 102a is used as a reference base station, and the time synchronization process performed by the base station 102b with the reference base station through the air interface is described in detail below.
  • the first type of time difference acquisition process between the base stations is the same as that of the second embodiment.
  • the base station 102a serves as the first base station
  • the base station 102b serves as the second base station.
  • the base station 102a obtains the first time difference and reports it to the base station 102a.
  • the central controller 101, the first time difference belongs to the first type of time difference.
  • the first type of time difference acquisition process between the base stations is the same as that of the second embodiment.
  • the base station 102a serves as the second base station, and the base station 102b serves as the first base station.
  • the base station 102b obtains the time difference and reports it to the centralized control. 101.
  • the base station 102a may acquire a plurality of first type time differences and report them to the centralized controller 101, if there are multiple UEs that are handed over from the base station 102b to the base station 102a, The base station 102b can also acquire a plurality of first type time differences and send them to the centralized controller 101.
  • the central controller 101 acquires at least one first type of time difference between the base station 102a and the base station 102b from the base station 102a and/or the base station 102b by means of inter-station handover.
  • the centralized controller 101 determines whether the acquired at least one first type time difference is accurate. If accurate, the centralized controller 101 determines at least one first type time difference between the base station 102a and the base station 102b and the reference of the reference base station (ie, the base station 102a). Time, obtaining the time adjustment amount of the non-reference base station relative to the reference base station, that is, the time adjustment of the base station 102b relative to the base station 102a the amount.
  • the centralized controller 101 sends a time difference request message to the base station 102a and/or the base station 102b, and the UE selected by the base station 102a and/or the base station 102b initiates active random access, and actively The control mode acquires at least one second type time difference.
  • the centralized controller 101 may transmit a time difference request message to the base station 102a, may also transmit a time difference request message to the base station 102b, and may also transmit a time difference request message to both the base station 102a and the base station 102b.
  • the process by which the centralized controller 101 transmits a time difference request message to the base station 102a and/or the base station 102b to acquire at least one second type time difference can be referred to the related description of Embodiment 2.
  • the central controller 101 acquires a plurality of time differences (including at least one first type time difference and at least one second type time difference) between the base station 102a and the base station 102b by using the inter-station switching mode and the active control mode, and determines the plurality of acquired time differences again. Whether it is accurate, if not accurate, the centralized controller 101 transmits a time difference request message to the base station 101a and/or the base station 102b to further acquire the second type time difference.
  • a plurality of time differences including at least one first type time difference and at least one second type time difference
  • the centralized controller 101 acquires the time adjustment amount of the non-reference base station relative to the reference base station according to the acquired multiple time differences and the reference time of the reference base station (base station 102a), that is, the time adjustment amount of the base station 102b with respect to the base station 102a. .
  • the centralized controller 101 transmits a time adjustment amount to the base station 102b, i.e., transmits a time adjustment amount to the non-reference base station.
  • the centralized controller 101 determines before transmitting the time adjustment amount. If the base station 102b, that is, the non-reference base station needs to perform time adjustment, the centralized controller 101 sends the time adjustment amount to the base station 102b.
  • the base station 102b receives the time adjustment amount transmitted by the centralized controller 101, acquires the time adjustment amount, performs time adjustment based on the time adjustment amount, and completes time synchronization.
  • the active random access procedure of the user equipment is utilized. Further obtaining a second type of time difference between the base stations. According to The obtained time difference and the reference time of the reference base station acquire the time adjustment amount of the non-reference base station, so that the non-reference base station performs time adjustment according to the time adjustment amount, and implements time synchronization between the non-reference base station and the reference base station.
  • the air interface synchronization method does not require expensive synchronous equipment, reduces construction and maintenance costs, and achieves economical and convenient technical effects.
  • the centralized controller 101 is independent of the base station, and the base station 102a is used as a reference base station, and the base station 102c performs time synchronization with the reference base station through the air interface.
  • the time difference acquisition process between the base station 102c and the base station 102b is as described in Embodiment 2 or Embodiment 3.
  • the time difference acquisition process between the base station 102b and the base station 102a is as described in Embodiment 2 or Embodiment 3.
  • the centralized controller 101 can obtain the time difference between the base station 102c and the base station 102a according to the time difference between the base station 102c and the base station 102b, and the time difference between the base station 102b and the base station 102a. Since the base station 102a is the reference base station, the base station 102c can be acquired with respect to the reference. The amount of time adjustment of the base station, that is, the amount of time adjustment of the non-reference base station relative to the reference base station.
  • the centralized controller 101 transmits to the base station 102c the time adjustment amount base station 102c receives the time adjustment amount transmitted from the centralized controller 101, performs time adjustment based on the time adjustment amount, and completes the time synchronization.
  • the centralized controller 101 can also send a time adjustment amount to the base station 102b.
  • the base station 102b receives the time adjustment amount transmitted by the centralized controller 101, performs time adjustment based on the time adjustment amount, and completes time synchronization.
  • the active random access procedure of the user equipment is utilized. Further obtaining a second type of time difference between the base stations. According to The obtained time difference and the reference time of the reference base station acquire the time adjustment amount of the non-reference base station, so that the non-reference base station performs time adjustment according to the time adjustment amount, and implements time synchronization between the non-reference base station and the reference base station.
  • the air interface synchronization method does not require expensive synchronous equipment, reduces construction and maintenance costs, and achieves economical and convenient technical effects.
  • the base station includes the functions of the centralized controller, the air interface time synchronization processing method is described in detail below.
  • FIG. 10 is another processing method of the first base station in the air interface synchronization scheme according to the embodiment of the present invention.
  • 51001 Acquire a first time difference according to the non-contention random access of the first UE that is handed over between the first base station and the second base station.
  • the first base station and the second base station respectively detect a random access preamble acquisition and receiving time of the first UE, and the first base station receives the received according to the acquisition.
  • the first time difference is calculated at any time.
  • the first time difference belongs to the first type of time difference.
  • the first base station calculates a first time difference between the first base station and the second base station according to the first receiving time and the second receiving time, where the first receiving time is a time when the first base station detects the first random access preamble, and the second receiving time is When the second base station detects the moment of the first random access preamble, the first random access preamble is a non-contention random access preamble for the first UE to perform handover between the first base station and the second base station, which is the second base station.
  • the first base station may further calculate a first time difference according to the first receiving time, the first transmission delay, the second receiving time, and the second transmission delay, where the first transmission delay is a transmission delay of the first UE to the first base station, The second transmission delay is a transmission delay of the first UE to the second base station.
  • the first base station sends the first time difference to the second base station, so that the second base station determines whether the acquired at least one first type time difference is accurate, and the at least one first type time difference includes the first time difference. If the second base station determines that the acquired time difference of the at least one first type is inaccurate, the second base station acquires the second type of time difference by using an active control manner, and if it is determined that the acquired time difference of the at least one first type is accurate, the second base station acquires the time difference Process it.
  • the first base station If the first base station receives the time difference request message sent by the second base station, the first base station acquires a second time difference between the first base station and the second base station by using the active random access of the second UE.
  • the second base station determines that the acquired time difference of the at least one first type is inaccurate, if the first base station receives the time difference request message sent by the second base station, the first base station selects the second UE, and uses the active random access of the second UE to obtain The second time difference.
  • the second time difference belongs to the second type of time difference.
  • the third random access preamble is allocated to the second UE, and the third random access preamble is detected to obtain the third receiving time, and the first base station calculates according to the third receiving time and the fourth receiving time. a second time difference between the first base station and the second base station, and sending the second time difference to the second base station, where the fourth receiving time is a time at which the second base station detects the third random access preamble.
  • the third random access preamble is a non-contention random access preamble, so that the second UE initiates active random access by using the third random access to the first base station.
  • the first base station sends the second time difference to the second base station, so that the second base station determines that the acquired time difference is accurate, and the second base station obtains the time adjustment amount of the non-reference base station according to the acquired time difference and the reference time of the reference base station.
  • the acquired time difference includes the at least one first type time difference and the at least one second type time difference, and the at least one second type time difference includes the second time difference.
  • the non-reference base station is the first base station; or, when the reference base station is the first base station, the non-reference base station is the second base station.
  • the second base station determines the time difference obtained above, and if it is determined that the acquired time difference is accurate, acquires the time adjustment amount of the non-reference base station.
  • Time adjustment is performed after the non-baseline reference acquires the time adjustment amount.
  • FIG. 11 is another processing method of the second base station in the air interface synchronization scheme according to the embodiment of the present invention.
  • S1101 Obtain at least one first type time difference, and at least one first type time difference includes The first time difference, the first time difference is a time difference obtained according to the non-contention random access of the first UE that is handed over between the first base station and the second base station.
  • the second base station acquires at least one first type time difference between the first base station and the second base station, and at least one first type time difference includes the first time difference.
  • the first time difference may be a time difference calculated according to the first receiving time and the second receiving time, or may be a first base station acquired according to the first receiving time, the first transmission delay, the second receiving time, and the second transmission time delay. The time difference between the second base station and the second base station.
  • the first receiving time is a time when the first base station detects the first random access preamble
  • the second receiving time is a time when the second base station detects the first random access preamble
  • the first transmission delay is the first UE to the first
  • the transmission delay of the base station where the second transmission delay is the transmission delay of the first UE to the second base station.
  • the centralized controller can acquire multiple first type time differences using the above process.
  • S1102 Acquire a time adjustment amount of the non-reference base station according to the at least one first type time difference and a reference time of the reference base station, where the reference base station is the second base station, and the non-reference base station is the first The base station, or the reference base station is the first base station, and the non-reference base station is the second base station.
  • the second base station acquires a time adjustment amount of the non-reference base station according to the at least one first type time difference and the reference time of the reference base station.
  • the second base station determines whether the acquired time difference of the at least one first type is accurate.
  • the method for accurately determining the acquired time difference of the at least one first type by the second base station is the same as the method for accurately determining the time difference of the centralized controller in Embodiment 1.
  • the second base station acquires at least one second type time difference, and the at least one second type time difference includes a second time difference, and the second base station may send a time difference request message to the first base station, so that the first base station The second UE is selected, and the second time difference is obtained by using the active random access of the second UE.
  • the second base station may periodically send a time difference request message to the first base station, or may send a time difference request message to the first base station when the first base station is relatively idle according to the first base station load condition or service condition, and may also send a time difference request message according to system requirements. Sending a time difference request message to the first base station.
  • the second base station processes the acquired time difference, and the second base station processes the acquired time difference and concentrates in Embodiment 1
  • the controller is handled in the same way.
  • the second base station determines the time adjustment amount of the non-reference base station based on the time difference obtained by the processing and the reference time of the reference base station.
  • the second base station directly determines the time adjustment amount of the non-reference base station based on the one time difference and the reference time of the reference base station.
  • S1103 Send the time adjustment amount to the non-reference base station.
  • the second base station sends the time adjustment amount to the non-reference base station, so that the non-reference base station performs time adjustment according to the acquired time adjustment amount, and completes time synchronization.
  • the second base station sends a time adjustment amount to the first base station, so that the first base station performs time adjustment according to the time adjustment amount; or, if the reference base station is the first base station, the second base station directly adjusts according to the time Make time adjustments.
  • the active random access procedure of the user equipment is utilized. Further obtaining a second type of time difference between the base stations.
  • the time adjustment amount of the non-reference base station is obtained according to the acquired time difference and the reference time of the reference base station, so that the non-reference base station performs time adjustment according to the time adjustment amount, thereby implementing time synchronization between the non-reference base station and the reference base station.
  • the air interface synchronization method does not require expensive synchronous equipment, reduces construction and maintenance costs, and achieves economical and convenient technical effects.
  • the second base station is provided with the centralized controller function in Embodiment 2,
  • the inter-synchronization method is described in detail below.
  • the first type of time difference is obtained according to the non-contention random access of the first UE that is handed over between the first base station and the second base station, and the processing method of the first base station and the processing method of the second base station are similar to the description in the second embodiment, and the difference is
  • the first base station sends the first time difference to the second base station, so that the second base station determines and processes the acquired time difference, and the first time difference belongs to the first type time difference.
  • the second base station uses the non-contention random access of the UE between the first base station and the second base station, acquires at least one first type time difference between the first base station and the second base station, and the at least one first type time difference includes the first Time difference.
  • the second base station Determining, by the second base station, whether the acquired at least one first type time difference is accurate. If accurate, the second base station acquires a non-reference according to at least one first type time difference between the first base station and the second base station and a reference time of the reference base station. The time adjustment amount of the base station relative to the reference base station, when the reference base station is the first base station, the second base station is a non-reference base station, or when the reference base station is the second base station, the first base station is a non-reference base station.
  • the second base station acquires at least one second type time difference between the first base station and the second base station (the second type time difference is a time difference acquired by the active control mode, that is, a time difference obtained by the UE active random access) .
  • the second base station further determines whether the acquired time difference (including the acquired at least one first type time difference and the acquired at least one second type time difference) is accurate, and if accurate, the second base station according to the acquired time difference and the reference time of the reference base station Obtaining a time adjustment amount of the non-reference base station relative to the reference base station.
  • the second base station may obtain at least one second type time difference by using the active random access of the UE by the first base station, or may utilize the active random of the UE by using the second base station itself.
  • the access acquires at least one second type of time difference.
  • the second base station determines whether the acquired time difference is accurate or not is the same as that of the centralized controller in the second embodiment.
  • the second type of time difference is obtained by using the active random access of the UE, and the processing method of the first base station is And the processing method of the second base station is similar to the description in Embodiment 2, except that, in this embodiment, the first base station sends the second time difference to the second base station, so that the second base station determines and processes the acquired time difference.
  • the second time difference belongs to the second type of time difference.
  • the second base station uses the active random access of the UE, acquires at least one second type time difference between the first base station and the second base station, and the at least one second type time difference includes a second time difference.
  • the second base station processes the acquired time difference, and the acquired time difference includes at least one first type time difference and at least one second type time difference, and the processing method thereof is the same as the processing method of the time difference obtained by the centralized controller in Embodiment 2.
  • the first base station is a non-reference base station
  • the second base station acquires the time adjustment amount of the first base station relative to the second base station according to the acquired time difference and the reference time of the reference base station, The amount of time adjustment of the base station relative to the base station.
  • the second base station sends a time adjustment amount to the first base station, that is, transmits a time adjustment amount to the non-reference base station, and the first base station receives the time adjustment amount sent by the second base station, performs time adjustment according to the time adjustment amount, and completes time synchronization.
  • the second base station is a non-reference base station
  • the second base station acquires the time adjustment amount of the second base station relative to the first base station according to the acquired time difference and the reference time of the reference base station, so that the non-reference can be obtained.
  • the second base station transmits a time adjustment amount to the second base station, that is, transmits a time adjustment amount to the non-reference base station.
  • the second base station since the second base station has the function of the centralized controller, the second base station directly adjusts the time according to the time adjustment amount to complete the time synchronization.
  • the active random access procedure of the user equipment is utilized. Further obtaining a second type of time difference between the base stations.
  • the time adjustment amount of the non-reference base station is obtained according to the acquired time difference and the reference time of the reference base station, so that the non-reference base station performs time adjustment according to the time adjustment amount, and time synchronization between the non-reference base station and the reference base station is implemented.
  • This air interface synchronization method does not require expensive synchronization equipment, which reduces construction and Maintenance costs, economic and convenient technical results.
  • the base station is used as a reference base station, and the second base station is a non-reference base station as an example.
  • the first base station includes a time difference calculation unit 1031 and a time difference transmission unit 1036.
  • the time difference calculation unit 1031 is configured to obtain a first time difference according to the non-contention random access of the first UE that is handed over between the first base station and the second base station, where the first base station is a reference base station, and the second base station is a non-reference base station.
  • the time difference sending unit 1036 is configured to send the first time difference acquired by the time difference calculating unit 1031 to the centralized controller, so that the centralized controller determines whether the acquired at least one first type time difference is accurate, and the at least one first type time difference includes the The first time difference.
  • the time difference calculation unit 1031 is configured to calculate the first time difference according to the first receiving time and the second receiving time.
  • the first base station further includes:
  • the random access preamble detecting unit 1028 is configured to detect a first random access preamble, where the first random access preamble is a non-contention random access preamble for the first UE to perform handover between the first base station and the second base station.
  • the time information obtaining unit 1030 is configured to acquire a first receiving moment when the random access preamble detecting unit 1028 detects the first random access preamble, where the first receiving moment is that the random access preamble detecting unit 1028 detects the first The time at which the preamble is randomly accessed; the time information acquiring unit 1030 is further configured to acquire a second receiving moment, where the second receiving moment is a moment when the second base station detects the first random access preamble.
  • the first base station further includes a mobility management unit 1032, configured to send, according to the neighboring cell measurement report of the first UE, a handover request message to the second base station, where the mobility management unit 1032 receives the second base station to send After the handover request acknowledgement message, the random access preamble detection unit 1028 initiates random access preamble detection.
  • a mobility management unit 1032 configured to send, according to the neighboring cell measurement report of the first UE, a handover request message to the second base station, where the mobility management unit 1032 receives the second base station to send After the handover request acknowledgement message, the random access preamble detection unit 1028 initiates random access preamble detection.
  • moving The severity management unit 1032 is configured to send a handover command message to the first UE, so that the first UE initiates random access according to the first random access to the second base station, where the handover request acknowledgement message and the handover command message carry the An index of a random access preamble, where the first random access preamble is a non-contention random access preamble allocated by the second base station to the first UE;
  • the time difference calculation unit 1031 is configured to calculate the first time difference according to the first receiving time, the first transmission delay, the second receiving time, and the second transmission delay.
  • the first transmission delay is a transmission delay of the first UE to the first base station
  • the second transmission delay is a transmission delay of the first UE to the second base station.
  • the first base station further includes a resource mapping unit 1021, configured to: after the mobility management unit 1032 sends a handover request message to the second base station, send a PDCCH Order to the first UE, where the PDCCH Order carries an index of the second random access preamble, After the first UE receives the PDCCH Order, the first base station is configured to initiate active random access according to the second random access, and the random access preamble management unit 1029 is configured to allocate the second random access preamble to the first UE.
  • a resource mapping unit 1021 configured to: after the mobility management unit 1032 sends a handover request message to the second base station, send a PDCCH Order to the first UE, where the PDCCH Order carries an index of the second random access preamble, After the first UE receives the PDCCH Order, the first base station is configured to initiate active random access according to the second random access, and the random access preamble management unit 1029 is configured to allocate the second random access preamble to the first UE.
  • the random access preamble detecting unit 1028 is further configured to detect the second random access preamble.
  • the time information acquiring unit 1030 acquires the first transmission delay of the first UE to the first base station. .
  • the time information obtaining unit 1030 is configured to obtain a second transmission delay sent by the second base station.
  • the mobility management unit 1032 is further configured to receive a user resource release message sent by the second base station, where the user resource release message carries the second receiving time or the second receiving time and the second transmission delay.
  • the time information acquisition unit 1030 acquires the second reception time or the second reception time and the second transmission delay, so that the time difference calculation unit 1031 calculates the first time difference.
  • the first base station further includes a user selection unit 1037.
  • the user selecting unit 1037 is configured to: after receiving the time difference request message sent by the centralized controller, select the second UE, optionally, the downlink signal strength of the first base station measured by the second UE and the second base station measured by the first UE When the downlink signal strength difference is lower than the first threshold, the second UE is selected.
  • the time difference calculation unit 1031 is further configured to obtain, according to the second UE selected by the user selection unit 1037, the second time difference between the first base station and the second base station by using active random access of the second UE.
  • the time difference sending unit 1036 is further configured to send the second time difference acquired by the time difference calculating unit 1031 to the centralized controller, so that the centralized controller determines that the acquired time difference is accurate, and obtains the first time according to the acquired time difference and the reference time of the first base station.
  • the time adjustment amount of the two base stations, the acquired time difference includes the at least one first type time difference and the at least one second type time difference, and the at least one second type time difference includes the second time difference.
  • the random access preamble management unit 1029 further uses Allocating the third random access preamble to the second UE selected by the user selecting unit 1037, and transmitting the third random access preamble information to the second base station, so that the second base station acquires the third random access
  • the random access preamble detection is started after the preamble information, and the random access preamble management unit 1029 is further configured to receive a random access preamble detection start success confirmation message sent by the second base station.
  • the random access preamble detecting unit 1028 is further configured to detect the third random access preamble used by the second UE to initiate active random access.
  • the time information acquiring unit 1030 is further configured to acquire a third receiving time and a fourth receiving time, where the third receiving time is a time when the random access preamble detecting unit 1028 detects the third random access preamble, and the fourth receiving time is the second receiving time. The time when the base station detects the third random access preamble.
  • the resource mapping unit 1021 is further configured to: after the random access preamble management unit receives the random access preamble detection start success confirmation message sent by the second base station, trigger the second UE to use the third random access pre-direction first.
  • the base station initiates active random access.
  • the PDCCH Order is sent to the second UE by the resource mapping unit 1021.
  • the PDCCH Order carries the index of the third random access preamble, and the second UE initiates the active random access according to the third random access pre-directed to the first base station.
  • the second base station includes an adjustment amount acquisition unit 1034 and a time adjustment unit 1035.
  • the adjustment amount obtaining unit 1034 is configured to receive a time adjustment amount sent by the centralized controller, where the time adjustment amount is a time adjustment amount of the second base station acquired by the centralized controller according to the acquired time difference and the reference time of the first base station,
  • the centralized controller determines that the at least one first type time difference is accurate, the acquired time difference is at least one first type time difference, and the at least one first type time difference includes a first time difference, where the first time difference is according to the first base station and the second base station switching The time difference of the non-contention random access acquisition of the first UE, or when the centralized controller determines that the time difference of the at least one first type is inaccurate, the acquired time difference is at least one first type time difference and one second type time difference, at least A second type of time difference includes a second time difference, and the second time difference is a time difference obtained by using the active random access of the second UE.
  • the time adjustment unit 1035 is configured to perform time adjustment according to the time adjustment amount acquired by the adjustment amount acquiring unit 1034, and complete time synchronization with the first base station, that is, keep time synchronization with the reference base station.
  • the base station calculates the first time difference
  • the second base station calculates the first time difference according to the first base station and the second base station, according to the first base station and the second base station detecting the non-contention random access preamble receiving time of the first UE.
  • the base station further includes: a random access preamble management unit 1029, a mobility management unit 1032, a random access preamble detection unit 1028, and a time information acquisition unit 1030.
  • the random access preamble management unit 1029 is configured to allocate a first random access preamble for the first UE, where the first random access preamble is used for the first UE to perform handover between the first base station and the second base station. Stochastic access to the preamble.
  • the mobility management unit 1032 is configured to: after receiving the handover request message sent by the first base station, send a handover request acknowledgement message to the first base station, so that the first base station starts the random access preamble detection, where the handover request acknowledgement message carries the random access preamble The index of the first random access preamble allocated by the management unit to the first UE.
  • the random access preamble detecting unit 1028 is configured to detect the first random access preamble.
  • the time information obtaining unit 1030 is configured to detect the first random access preamble by the random access preamble detecting unit 1028, and obtain a second receiving time.
  • the second receiving time and the second transmission delay may also be acquired.
  • the second transmission delay is a transmission delay of the first UE to the second base station.
  • the mobility management unit 1032 is further configured to send the second receiving moment acquired by the time information acquiring unit 1030 to the first base station, so that the first base station acquires a first time difference between the first base station and the second base station; Alternatively, the second receiving time and the second transmission delay acquired by the time information acquiring unit 1030 are sent to the first base station.
  • the mobility management unit 1032 sends a user resource release message to the first base station, where the user resource release message carries the second receiving time or the user resource translation message carries the first Two receiving moments and a second transmission delay.
  • the random access preamble management unit 1029 is further configured to receive a third random access preamble sent by the first base station, where the third random access preamble is used by the first base station to allocate the second UE Non-contention random access preamble for active random access;
  • the random access preamble detecting unit 1028 is further configured to: after the random access preamble management unit 1029 receives the third random access preamble sent by the first base station, initiate random access preamble detection;
  • the random access preamble management unit 1029 is further configured to: after the random access preamble detecting unit 1028 starts the random access preamble detection, send a random access preamble detection start success confirmation message to the first base station, so that the A base station triggers the second UE to perform active random access by using the third random access preamble;
  • the random access preamble detecting unit 1028 is further configured to detect the third random access preamble used by the second UE to initiate active random access.
  • the time information acquiring unit 1030 is further configured to: when the random access preamble detecting unit 1028 detects the third random access preamble, acquire a fourth receiving moment, and send the fourth receiving moment to the first a base station, so that the first base station calculates the second time difference according to the third receiving time and the fourth receiving time, where the third receiving time is that the first base station detects the third random access preamble Moment.
  • the first base station and the second base station can be interchanged for calculating the time difference using the random access preamble of the handover UE.
  • the second base station may include the foregoing unit of the first base station and perform a corresponding function
  • the first base station may also include the foregoing unit of the second base station and perform a corresponding function, that is, for switching from the second base station to the first
  • the UE of the base station may transmit the time difference obtained by the time difference calculation unit 1031 to the centralized controller by the time difference transmitting unit 1036 of the second base station.
  • the centralized controller device includes a first type time difference acquisition unit 1014, a time adjustment amount processing unit 1011, and an adjustment amount transmission unit 1012.
  • the first type time difference obtaining unit 1014 is configured to acquire at least one first type time difference, where the at least one first type time difference includes a first time difference, where the first time difference is a non-substantially according to the first UE that is switched between the first base station and the second base station. The time difference for random access acquisition.
  • the time adjustment amount processing unit 1011 is configured to acquire a time adjustment amount of the second base station according to the at least one first type time difference and a reference time of the first base station, where the first base station is a reference base station, and the second base station is a non-reference base station. .
  • the time adjustment amount processing unit 1011 needs to process the acquired time difference. For the case of at least two time differences, the averaging process may be performed, or the two time differences with the smallest difference may be averaged, or the maximum of the plurality of time differences may be removed. And the minimum value, the remaining time difference is averaged, and the average time difference obtained by the average processing is compared with the reference time to obtain the time adjustment amount.
  • the time adjustment amount processing unit 1011 is further configured to: when the at least one first type time difference is accurate, acquire the first according to the at least one first type time difference and the reference time of the first base station The amount of time adjustment of the two base stations.
  • the time adjustment amount processing unit 1011 is configured to determine that the at least one first type time difference is accurate, and includes:
  • the at least one first type of time difference Comparing the difference between any two of the at least one first type of time difference, if the smallest difference is less than the minimum difference threshold, the at least one first type of time difference is accurate.
  • the adjustment amount sending unit 1012 is configured to send the time adjustment amount acquired by the time adjustment amount processing unit 1011 to the second base station, and optionally, according to the time adjustment amount, determine whether the second base station needs time adjustment, if the second The base station needs to perform time adjustment, and then sends the time adjustment amount to the second base station.
  • the centralized controller further includes a second type time difference obtaining unit 1015.
  • the second type time difference obtaining unit 1015 is configured to acquire at least one second type time difference, where the at least one second type time difference includes a second time difference, and the second time difference is a time difference obtained by using the active random access of the second UE.
  • the centralized controller further includes a time difference requesting unit 1013, configured to send a time difference request message to the first base station, so that the first base station acquires the second time difference and sends the second time difference to the second type time difference acquiring unit 1015.
  • the time difference requesting unit 1013 may periodically send the time difference request message to the first base station; or, according to the first base station load condition, when the first base station load is lower than a load threshold, the time difference requesting unit 1013 reports the The first base station sends the time difference request message.
  • the time adjustment amount processing unit 1011 is further configured to: when the acquired time difference is accurate, acquire a time adjustment amount of the second base station according to the acquired time difference and the reference time of the first base station, where the acquired time difference includes At least one first type time difference acquired by the one type time difference obtaining unit 1014 and at least one second type time difference acquired by the second type time difference obtaining unit 1015.
  • the centralized controller further includes an interface unit 1016, configured to complete information interaction between the centralized controller and the base station.
  • the first base station and the second base station further include: a channel modulation unit 1022, a scheduling unit 1023, a medium radio frequency unit 1024, a channel estimation unit 1025, a channel demodulation unit 1026, a channel separation unit 1027, and an interface unit 1033.
  • the scheduling unit 1023 is composed of a downlink scheduling unit 10231 and an uplink scheduling unit 10232.
  • the downlink scheduling unit 10231 is configured to perform downlink resource scheduling according to the channel information fed back by the UE and the user related information from the upper layer.
  • the uplink scheduling unit 10232 is configured to perform uplink resource scheduling according to the channel estimation result of the uplink from the channel estimation unit 1025 and the resource request from the UE.
  • the medium radio frequency unit 1024 is configured to up-convert the channel-modulated OFDM signal and transmit it to the UE through the wireless channel by using the antenna.
  • the medium radio frequency unit 1024 receives the uplink signal of the UE by using the antenna, downconverts to the baseband signal, and transmits the baseband signal to the channel estimation unit 1025, the channel demodulation unit 1026, and the random access preamble detection unit 1028.
  • the channel estimation unit 1025 is configured to estimate a radio transmission path characteristic from the pilot channel of the uplink, and send the channel estimation result to the channel demodulation unit 1026. In order to accurately perform uplink and downlink resource scheduling, the channel estimation result is also sent to the scheduling unit 1023.
  • the channel demodulation unit 1026 is configured to demodulate the received signal sent by the middle radio frequency unit 1024 according to the channel estimation result of the channel estimation unit 1025.
  • the channel separating unit 1027 separates the signal processed by the channel demodulating unit 1026 into user data and control data.
  • the downlink CQI information in the separated control data is transmitted to the scheduling unit 1023, and other control data and user data are transmitted to the upper layer.
  • the interface unit 1033 includes an X2 interface between the base stations, and is used for information exchange between the base stations.
  • the S1 interface between the base station and the core network is used for information exchange between the base station and the core network.
  • the interface unit includes The interface between the centralized controllers is used for information exchange between the base station and the centralized controller.
  • the resource mapping unit 1021 is configured to map the control data and the user data input from the upper layer to the downlink control channel, the downlink synchronization channel, and the downlink data sharing channel according to the scheduling indication of the scheduling unit 1023.
  • the channel modulation unit 1022 performs data modulation, serial/parallel conversion, IFFT conversion, CP processing, and the like, and generates an OFDM signal.
  • FIG. 13 is a schematic diagram of an apparatus for a centralized controller according to an embodiment of the present invention, including a processor 1301, a memory 1302, and an interface 1303.
  • the processor 1301 and the memory 1302 and the interface 1303 are connected by a bus.
  • the interface 1303 is for performing information interaction with the base station 102.
  • the memory 1302 is for storing program code, and the processor 1301 calls the program code stored in the memory for executing the method of the centralized controller in the second embodiment.
  • FIG. 14 is a schematic diagram of an apparatus for a first base station according to an embodiment of the present invention, including a processor 1401, a memory 1402, a transceiver 1403, and an interface 1404.
  • the processor 1401 and the memory 1402 and the transceiver 1403 and the interface 1404 are connected by a bus.
  • the interface 1404 is used for information interaction between base stations or information exchange between the base station and the core network.
  • the transceiver 1403 is configured to perform information interaction with the user equipment.
  • the memory 1402 is for storing program code, and the processor 1401 calls the program code stored in the memory 1402 to execute the method of the first base station in Embodiment 2.
  • FIG. 15 is a schematic diagram of an apparatus for a second base station according to an embodiment of the present invention, including a processor 1501, a memory 1502, a transceiver 1503, and an interface 1504.
  • the processor 1501 and the memory 1502 are connected to the transceiver 1503 and the interface 1504 by using a bus.
  • the interface 1504 is used for information interaction between base stations or information exchange between the base station and the core network.
  • the transceiver 1503 is configured to perform information interaction with the user equipment.
  • the memory 1502 is for storing program code, and the processor 1501 calls the program code stored in the memory 1502 to execute the method of the second base station in Embodiment 2.
  • the non-contention random access procedure of the user equipment switched between the base stations is used to obtain the first type time difference between the base stations through the signaling interaction, the system requirements are not met, and the active random access of the user equipment is further used.
  • the second type of time difference between base stations Obtaining a time adjustment amount of the non-reference base station according to the obtained time difference and the reference time of the reference base station, so that the non-standard base station performs time adjustment according to the time adjustment amount, and time synchronization between the non-reference base station and the reference base station is implemented.
  • the air interface synchronization method does not require expensive synchronous equipment, reduces construction and maintenance costs, and achieves economical and convenient technical effects.
  • FIG. 12 is a schematic diagram of another structure of a base station according to an embodiment of the present invention, where the second base station includes the functions of the centralized controller in Embodiment 7.
  • the reference base station is the second base station
  • the non-reference base station is the first base station; or, when the reference base station is the first base station, the non-reference base station is the second base station.
  • the first base station is basically the same as the embodiment , except that, in this embodiment, the time difference transmitting unit 1036 of the first base station transmits the time difference obtained by the time difference calculating unit 1031 to the second base station.
  • the first base station further includes an adjustment amount acquisition unit 1034 and a time adjustment unit 1035.
  • the adjustment amount obtaining unit 1034 is configured to acquire the time adjustment amount sent by the second base station when the reference base station is the second base station.
  • the time adjustment unit 1035 is configured to perform time adjustment according to the time adjustment amount acquired by the adjustment amount acquisition unit 1034.
  • the second base station includes the centralized controller function in the embodiment, and therefore, the second base station includes: a first type time difference acquisition unit 1014, a time adjustment amount processing unit 1011, and an adjustment amount transmission unit 1012.
  • a first type time difference obtaining unit 1014 configured to acquire at least one first type time difference
  • the at least one first type time difference includes a first time difference, where the first time difference is a time difference obtained according to the non-contention random access of the first UE that is handed over between the first base station and the second base station;
  • the time adjustment amount processing unit 1011 acquires the time adjustment amount of the non-reference base station based on the at least one first type time difference and the reference time of the reference base station.
  • the adjustment amount transmitting unit 1012 is configured to transmit the time adjustment amount acquired by the time adjustment amount processing unit 1011 to the non-reference base station, so that the non-reference base station performs time adjustment according to the time adjustment amount.
  • the time adjustment amount processing unit 1011 is further configured to: when the at least one first type time difference is accurate, acquire the non-reference according to the at least one first type time difference and the reference time of the reference base station The amount of time adjustment of the base station.
  • the second base station further includes:
  • the second type time difference obtaining unit 1015 is configured to acquire at least one second type time difference, the at least one second type time difference includes a second time difference, and the second time difference is a time difference obtained by using the active random access of the second UE.
  • the second base station further includes a time difference requesting unit 1013, configured to send a time difference request message to the first base station, so that the first base station acquires the second time difference and sends the second time difference to the second type time difference obtaining unit 1015.
  • a time difference requesting unit 1013 configured to send a time difference request message to the first base station, so that the first base station acquires the second time difference and sends the second time difference to the second type time difference obtaining unit 1015.
  • the time adjustment amount processing unit 1011 is further configured to: when the acquired time difference is accurate, acquire a time adjustment amount of the non-reference base station according to the acquired time difference and the reference time of the reference base station, where the acquired time difference includes the first The at least one first type time difference acquired by the type time difference obtaining unit 1014 and the at least one second type time difference acquired by the second type time difference obtaining unit 1015.
  • FIG. 16 is a schematic diagram of another apparatus for a first base station according to an embodiment of the present invention, including a processor 1601, a memory 1602, a transceiver 1603, and an interface 1604.
  • the processor 1601 and the memory 1602 and the transceiver 1603 and the interface 1604 are connected by a bus. .
  • the interface 1604 is used for information interaction between base stations or information exchange between the base station and the core network.
  • the transceiver 1603 is configured to perform information interaction with the user equipment.
  • the memory 1602 is for storing program code, and the processor 1601 calls the program code stored in the memory 1602 for executing the method of the first base station in Embodiment 6.
  • FIG. 17 is a schematic diagram of another apparatus for a second base station according to an embodiment of the present invention, including a processor 1701, a memory 1702, a transceiver 1703, and an interface 1704.
  • the processor 1701 and the memory 1702 and the transceiver 1703 and the interface 1704 are connected by using a bus. .
  • the interface 1704 is used for information interaction between base stations or information exchange between the base station and the core network.
  • the transceiver 1703 is configured to perform information interaction with the user equipment.
  • the memory 1702 is for storing program code, and the processor 1701 calls the program code stored in the memory 1702 for executing the method of the second base station in Embodiment 6.
  • the non-contention random access procedure of the user equipment switched between the base stations is used to obtain the first type time difference between the base stations through the signaling interaction, the system requirements are not met, and the active random access of the user equipment is further used.
  • the second type of time difference between base stations Obtaining a time adjustment amount of the non-reference base station according to the obtained time difference and the reference time of the reference base station, so that the non-standard base station performs time adjustment according to the time adjustment amount, and time synchronization between the non-reference base station and the reference base station is implemented.
  • the air interface synchronization method does not require expensive synchronous equipment, reduces construction and maintenance costs, and achieves economical and convenient technical effects.
  • the disclosed system, apparatus, and method may be implemented in other manners.
  • the device embodiments described above are merely illustrative, for example, the division of the modules or units is only a logical functional division. There may be additional ways of dividing the actual implementation, for example multiple units or components may be combined or integrated into another system, or some features may be omitted or not implemented.
  • the mutual coupling or direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection through some interface, device or unit, and may be in an electrical, mechanical or other form.
  • the units described as separate components may or may not be physically separate, and the components displayed as units may or may not be physical units, i.e., may be located in one place, or may be distributed over multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose 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 functional 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

本发明公开一种空中接口同步方法、基站及其控制装置及无线通信系统。如果利用基站间切换的用户设备的非竟争随机接入过程,通过信令交互获取基站间的第一类型时间差不能满足系统要求,则利用用户设备的主动随机接入进一步获取基站间的第二类型时间差。根据获取的时间差以及基准基站的基准时间获取非基准基站的时间调整量,以便非基准基站根据时间调整量进行时间调整,实现非基准基站与基准基站的时间同步。该空口同步方式不需要采用昂贵的同步设备,降低了建设和维护成本,达到经济、方便的技术效果。

Description

空口同步的方法、 基站、 控制装置及无线通信系统
技术领域 本发明涉及无线通信领域, 特别是涉及空中接口同步方法、 基站、 控 制装置及无线通信系统。
背景技术 随着无线网络容量需求的日益增大, 为获得更高的网络容量, 站点部 署更加密集。 对于长期演进(Long Term Evolution, LTE ) 系统, 无论是同 构网 ( Homogenous Network, HomNet )还是异构网 ( Heterogeneous Network, HomNet ), 由于站点部署更加密集, 小区间的干扰更加严重, 小区边界的 用户吞吐量下降, 严重的时候影响边缘用户正常工作。 边缘用户资源错开 可以解决小区间干扰问题。 现有的做法是采用小区间时域干扰协调, 通过 协调不同小区之间子帧的使用, 实现小区间干扰错开。 具体是通过几乎空 白子帧 (Almost Blank Subframes, ABS)技术来实现, ABS子帧完全不发送 数据, 仅传输参考信号,。 干扰小区的某些子帧设置为 ABS 子帧, 被干扰 小区在对应子帧上就几乎不会受到干扰。
实现小区间时域干扰协调的前提是小区之间时间同步。 通常的做法是 采用全球定位系统( Global Positioning System, GPS )进行小区间时间同步, 这需要每个站点都配置 GPS。 这种利用 GPS的同步技术称为硬同步技术。
利用 GPS进行时间同步存在建设成本高以及维护成本高的问题。
发明内容 本发明实施提供一种实现基站间空口时间同步的处理方法、 装置及无 线通信系统, 用以解决现有利用 GPS进行基站间时间同步存在的建设成本 高和维护成本高的问题。
本发明实施例具体可以通过如下技术方案实现:
第一方面, 提供了一种集中控制器的装置, 该装置包括:
第一类型时间差获取单元, 用于获取至少一个第一类型时间差, 所述 至少一个第一类型时间差包含第一时间差, 所述第一时间差为根据第一基 站和第二基站间切换的第一 UE的非竟争随机接入获取的时间差;
时间调整量处理单元, 用于根据所述至少一个第一类型时间差和第一 基站的基准时间, 获取第二基站的时间调整量, 其中, 第一基站是基准基 站, 第二基站是非基准基站;
调整量发送单元, 用于将所述时间调整量处理单元获取的所述时间调 整量发送给所述第二基站, 以便所述第二基站根据所述时间调整量进行时 间调整。
结合第一方面, 在第一种可能的实现方式中, 所述时间调整量处理单 元, 用于根据所述至少一个第一类型时间差和第一基站的基准时间, 获取 第二基站的时间调整量, 包括:
用于当所述至少一个第一类型时间差准确时, 根据所述至少一个第一 类型时间差和所述第一基站的基准时间, 获取所述第二基站的时间调整量。
结合第一方面或结合第一方面在第一种可能的实现方式中, 还包括: 第二类型时间差获取单元, 用于当所述时间调整量处理单元判断所述 至少一个第一类型时间差不准确时, 获取至少一个第二类型时间差, 所述 至少一个第二类型时间差包含第二时间差, 所述第二时间差为利用第二 UE 的主动随机接入获取的时间差;
所述时间调整量处理单元, 用于根据所述至少一个第一类型时间差和 第一基站的基准时间, 获取第二基站的时间调整量, 包括:
用于当已获取的时间差准确时, 根据所述已获取的时间差和第一基站 的基准时间, 获取所述第二基站的时间调整量, 所述已获取的时间差包括 所述第一类型时间差获取单元获取的至少一个第一类型时间差和所述第二 类型时间差获取单元获取的所述至少一个第二类型时间差。
第二方面, 还提供了一种空口同步中集中控制器的处理方法, 该方法 包括:
集中控制器获取至少一个第一类型时间差, 所述至少一个第一类型时 间差包含第一时间差, 所述第一时间差为根据第一基站和第二基站间切换 的第一 UE的非竟争随机接入获取的时间差;
所述集中控制器根据所述至少一个第一类型时间差和第一基站的基准 时间, 获取第二基站的时间调整量, 其中, 第一基站是基准基站, 第二基 站是非基准基站;
集中控制器将所述时间调整量发送给所述第二基站, 以便所述第二基 站根据所述时间调整量进行时间调整。
结合第二方面, 在第一种可能的实现方式中, 所述集中控制器根据所 述至少一个第一类型时间差和第一基站的基准时间, 获取第二基站的时间 调整量, 包括:
当所述至少一个第一类型时间差准确时, 所述集中控制器根据所述至 少一个第一类型时间差和所述第一基站的基准时间, 获取所述第二基站的 时间调整量。
结合第二方面或结合第二方面的第一种可能的实现方式中, 当所述至 少一个第一类型时间差不准确时, 所述集中控制器获取至少一个第二类型 时间差, 所述至少一个第二类型时间差包含第二时间差, 所述第二时间差 为利用第二 UE的主动随机接入获取的时间差;
当已获取的时间差准确时, 根据所述已获取的时间差和第一基站的基 准时间, 获取所述第二基站的时间调整量, 所述已获取的时间差包括所述 至少一个第一类型时间差和所述至少一个第二类型时间差。 第三方面, 还提供了一种集中控制器的装置, 该装置包括:
处理器、 存储器以及接口;
接口用于和基站进行信息交互;
存储器用于存储程序代码, 处理器调用存储器中存储的程序代码, 用 于执行空口同步中集中控制器的处理方法。
第四方面, 提供了一种基站的装置, 该装置包括:
第一类型时间差获取单元, 用于获取至少一个第一类型时间差, 所述 至少一个第一类型时间差包含第一时间差, 所述第一时间差为根据第一基 站和第二基站间切换的第一 UE的非竟争随机接入获取的时间差;
时间调整量处理单元, 用于根据所述至少一个第一类型时间差和基准 基站的基准时间, 获取非基准基站的时间调整量, 其中, 所述基准基站为 所述第二基站, 所述非基准基站为所述第一基站, 或者, 所述基准基站为 所述第一基站, 所述非基准基站为所述第二基站;
调整量发送单元, 用于将所述时间调整量处理单元获取的所述时间调 整量发送给所述非基准基站, 以便所述非基准基站根据所述时间调整量进 行时间调整。
结合第四方面, 在第一种可能的实现方式中, 所述时间调整量处理单 元, 用于根据所述至少一个第一类型时间差和基准基站的基准时间, 获取 非基准基站的时间调整量, 包括:
用于当所述至少一个第一类型时间差准确时, 根据所述至少一个第一 类型时间差和所述基准基站的基准时间, 获取所述非基准基站的时间调整 量。
结合第四方面或结合第四方面的第一种可能的实现方式中, 还包括: 第二类型时间差获取单元, 用于当所述时间调整量处理单元判断所述 至少一个第一类型时间差不准确时, 获取至少一个第二类型时间差, 所述 至少一个第二类型时间差包含第二时间差, 所述第二时间差为利用第二 UE 的主动随机接入获取的时间差;
所述时间调整量处理单元, 用于根据所述至少一个第一类型时间差和 基准基站的基准时间, 获取非基准基站的时间调整量, 包括:
用于当已获取的时间差准确时, 根据所述已获取的时间差和基准基站 的基准时间, 获取所述非基准基站的时间调整量, 所述已获取的时间差包 括所述第一类型时间差获取单元获取的所述至少一个第一类型时间差和所 述第二类型时间差获取单元获取的所述至少一个第二类型时间差。
第五方面, 还提供了一种空口同步中基站的处理方法, 该方法包括: 第二基站获取至少一个第一类型时间差, 所述至少一个第一类型时间 差包含第一时间差, 所述第一时间差为根据第一基站和所述第二基站间切 换的第一 UE的非竟争随机接入获取的时间差;
所述第二基站根据所述至少一个第一类型时间差和基准基站的基准时 间, 获取非基准基站的时间调整量, 其中, 所述基准基站为所述第二基站, 所述非基准基站为所述第一基站, 或者, 所述基准基站为所述第一基站, 所述非基准基站为所述第二基站;
所述第二基站将所述时间调整量发送给所述非基准基站, 以便所述非 基准基站根据所述时间调整量进行时间调整。
结合第五方面, 在第一种可能的实现方式中, 所述第二基站根据所述 至少一个第一类型时间差和基准基站的基准时间, 获取非基准基站的时间 调整量, 包括:
当所述至少一个第一类型时间差准确时, 所述第二基站根据所述至少 一个第一类型时间差和基准基站的基准时间, 获取非基准基站的时间调整 量。
结合第五方面或结合第五方面的第一种可能的实现方式中, 还包括: 当所述至少一个第一类型时间差不准确时, 所述第二基站获取至少一 个第二类型时间差, 所述至少一个第二类型时间差包含第二时间差, 所述 第二时间差为利用第二 UE的主动随机接入获取的时间差; 当已获取的时间差准确时, 根据所述已获取的时间差和所述基准基站 的基准时间, 获取所述非基准基站的时间调整量, 所述已获取的时间差包 括所述至少一个第一类型时间差和所述至少一个第二类型时间差。
第六方面, 还提供了一种基站的装置, 该装置包括:
包括处理器、 存储器、 收发机以及接口;
接口用于基站间的信息交互或基站与核心网的信息交互或用于和集中 控制器的信息交互;
收发机用于和用户设备进行信息交互;
存储器用于存储程序代码, 处理器调用存储器中存储的程序代码, 执 行空口同步中基站的处理方法。
从以上实施例描述可以看出, 本发明实施方式如果利用基站间切换的 用户设备的非竟争随机接入过程, 通过信令交互获取基站间的第一类型时 间差不能满足系统要求, 则利用用户设备的主动随机接入进一步获取基站 间的第二类型时间差。 根据获取的时间差以及基准基站的基准时间获取非 基准基站的时间调整量, 以便非基准基站根据时间调整量进行时间调整, 实现非基准基站与基准基站的时间同步。 该空口同步方式不需要采用昂贵 的同步设备, 降低了建设和维护成本, 达到经济、 方便的技术效果。
附图说明 图 1是本发明实施例提供的一种无线通信网络示意图;
图 2是本发明实施例提供的空中接口同步的装置结构示意图; 图 3是本发明实施例提供的空中接口同步中集中控制器的处理方法; 图 4是本发明实施例提供的空中接口同步中基站的处理方法; 图 5是本发明实施例提供的空中接口同步中基站的处理方法; 图 6是本发明实施例提供的利用站间切换方式进行时间差获取的方法; 图 7是本发明实施例提供的利用站间切换方式进行时间差获取的又一 种方法;
图 8是本发明实施例提供的利用 UE的主动随机接入进行时间差获取的 方法;
图 9是本发明实施例提供的利用定时器进行时间差处理的方法; 图 10是本发明实施例提供的空口同步方案中基站的另一种处理方法; 图 11是本发明实施例提供的空口同步方案中第二基站的另一种处理方 法;
图 12是本发明实施例提供的基站另一种结构示意图;
图 13为本发明实施例提供的集中控制器一种装置示意图;
图 14为本发明实施例提供的基站的一种装置示意图;
图 15为本发明实施例提供的基站的一种装置示意图;
图 16为本发明实施例提供的基站的另一种装置示意图;
图 17为本发明实施例提供的基站的另一种装置示意图。
具体实施方式 为使本发明的目的、 技术方案、 及优点更加清楚明白, 下面结合附图 并举实施例, 对本发明提供的技术方案进一步详细描述。
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, 所描述的实施例仅仅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 有作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。
如图 1所示为本发明实施例提供的的一种无线通信网络 100,该网络可 以为长期演进( Long Term Evolution, LTE )网络,,也可以为 LTE-Advanced 网络。 该无线通信网络包括若干基站(例如 102a, 102b, 102c, 102d等)、 集中控制器 101和其他网络实体(例如核心网, 核心网设备在图 1 中未体 现)用以支撑若干用户设备(例如 103a, 103b, 103c等)进行通信。
基站 102, 是 LTE中的演进型基站(evolved NodeB, eNodeB )。 一个 基站可以支持 /管理一个或多个小区, 每个基站可以服务多个 UE, UE选择 一个小区发起网络接入, 与基站 102进行语音和 /或数据业务。
用户设备(User Equipment, UE ) 103 也可称之为移动终端 (Mobile Terminal, MT )、 移动台 ( Mobile Station, MS )等。
为了达到网络中各个基站时间同步, 可以选择一个基站, 以该基站为 参考点, 调整其它基站的时间保持与该基站时间一致, 选择作为参考点的 基站称为基准基站, 其它基站称为非基准基站。
集中控制器 101 , 和各个基站可以进行信息交互。 获取基站间的至少 一个时间差, 根据至少一个时间差以及基准基站的基准时间, 获取非基准 基站相对于基准基站的时间调整量, 并向非基准基站发送时间调整量, 以 便非基准基站根据时间调整量进行时间调整, 与基准基站保持时间同步。 集中控制器 101 可以独立于基站之外, 作为一个独立的网元, 也可以位于 某一个基站内, 作为基站的一个功能实体。 系统以基准基站的时间为基准 时间, 其它基站为非基准基站, 当非基准基站的时间与基准时间有偏差时, 调整非基准基站的时间, 使非基准基站与基准基站保持时间同步。
实施例 1
图 3是本发明实施例提供的空口同步方案中集中控制器的处理方法, 详细描述如下。
集中控制器获取至少一个第一类型时间差并判断上述至少一个第一类 型时间差是否准确, 如果获取的至少一个第一类型时间差不准确, 则再获 取至少一个第二类型时间差并判断获取的时间差是否准确, 如果获取的时 间差准确, 则根据获取的时间差和基准基站的基准时间, 获取非基准基站 的时间调整量并将时间调整量发送给非基准基站, 上述获取的时间差包括 至少一个第一类型时间差和至少一个第二类型时间差。
S301 , 获取至少一个第一类型时间差, 至少一个第一类型时间差包含 第一时间差,第一时间差为根据第一基站和第二基站间切换的第一 UE的非 竟争随机接入获取的时间差。
集中控制器获取第一基站和第二基站间的至少一个第一类型时间差, 第一类型时间差为利用第一基站和第二基站间切换 UE 的非竟争随机接入 获取的时间差。第一时间差是根据第一基站和第二基站间切换第一 UE的非 竟争随机接入获取的时间差, 第一时间差属于第一类型时间差。 第一时间 差可以是根据第一接收时刻和第二接收时刻计算得到的时间差, 第一接收 时刻为第一基站检测到第一随机接入前导的时刻, 第二接收时刻为第二基 站检测到第一随机接入前导的时刻。第一随机接入前导为用于第一 UE进行 第一基站和第二基站间切换的非竟争随机接入前导。 集中控制器根据第一 基站和第二基站间切换的第一 UE的非竟争随机接入获取第一时间差。
当第一 UE从第一基站切换到第二基站时,第一 UE根据非竟争随机接 入前导向第二基站发起非竟争随即接入, 第一基站和第二基站分别通过检 测随机接入前导获取接收随机接入前导的时刻, 其中第一基站可以通过启 动随机接入前导检测来检测该非竟争随机接入前导; 第二基站将第二接收 时刻发送给第一基站; 第一基站根据第一接收时刻和第二接收时刻, 获取 第一基站和第二基站间的第一时间差, 将第一时间差发送给集中控制器。
如果存在多个 UE, 利用上述过程, 集中控制器可以获取多个第一类型 时间差。
可选的, 第一基站还可以获取第一 UE到第一基站的第一传输时延, 第 二基站也可以获取第一 UE到第二基站的第二传输时延,第一基站可以根据 第一接收时刻、 第一传输时延、 第二接收时刻和第二传输时延获取第一基 站和第二基站间的第一时间差, 即第一时间差可以是根据第一接收时刻、 第一传输时延、 第二接收时刻和第二传输时延获取的第一基站和第二基站 间时间差。
对于从第二基站切换到第一基站的 UE, 集中控制器也可以从第二基站 获取基站间的第一类型时间差。
S302, 根据所述至少一个第一类型时间差和第一基站的基准时间, 获 取第二基站的时间调整量, 其中, 第一基站是基准基站, 第二基站是非基 准基站。
当至少一个第一类型时间差准确时, 集中控制器根据至少一个第一类 型时间差和第一基站的基准时间, 获取第二基站的时间调整量。
集中控制器可以判断获取的至少一个第一类型时间差是否准确, 判断 获取的至少一个第一类型时间差是准确的, 包括:
统计至少一个第一类型时间差的数量, 如果数量超过数量门限, 则至 少一个第一类型时间差准确; 或者,
统计至少一个第一类型时间差的方差, 如果方差小于方差门限, 则至 少一个第一类型时间差准确; 或者,
比较至少一个第一类型时间差中的任意两个时间差之间的差值, 如果 最小的差值小于最小差值门限, 则至少一个第一类型时间差准确。
当至少一个第一类型时间差不准确时, 集中控制器获取至少一个第二 类型时间差, 至少一个第二类型时间差包含第二时间差, 第二时间差为利 用第二 UE的主动随机接入获取的时间差。
集中控制器可以向第一基站和 /或第二基站发送时间差请求消息, 获取 第一基站和第二基站之间的至少一个第二类型时间差。
集中控制器可以向第一基站发送时间差请求消息, 以便第一基站根据 时间差请求消息, 选取第二 UE, 利用第二 UE的主动随机接入获取第二时 间差, 第二时间差属于第二类型时间差。 第一基站根据根据第三接收时刻 和第四接收时刻计算第二时间差, 第三接收时刻为第一基站检测到第三随 机接入前导的时刻, 第四接收时刻为第二基站检测到第三随机接入前导的 时刻。第三随机接入前导为用于第二 UE进行主动随机接入的非竟争随机接 入前导。 集中控制器根据第二 UE的主动随机接入获取第二时间差。
集中控制器可以定时向第一基站发送时间差请求消息, 也可以根据第 一基站负载情况或业务情况, 在第一基站相对空闲的状态时, 向第一基站 发送时间差请求消息, 还可以根据系统需求, 向第一基站发送时间差请求 消息。
可以理解, 集中控制器也可以向第二基站发送时间差请求消息, 通过 第二基站利用 UE的主动随机接入获取第二类型时间差。
当已获取的时间差准确时, 根据已获取的时间差和第一基站的基准时 间, 获取所述第二基站的时间调整量。
集中控制器对获取的时间差进行处理, 得到第二基站相对于第一基站 的平均时间差或者第一基站相对于第二基站的平均时间差, 获取的时间差 可以只是上述至少一个第一类型时间差, 也可以是上述至少一个第一类型 时间差和上述至少一个第二类型时间差。
对于只有一个时间差的情况, 基准基站是第一基站, 第二基站为非基 准基站, 集中控制器根据第一基站的基准时间, 以及获取的一个时间差, 获取第二基站相对于第一基站的时间调整量, 即获取非基准基站相对于基 准基站的时间调整量。
对于多个时间差的情况, 集中控制器对获取的时间差进行处理, 上述 处理包括平均处理, 或将相差最小的两个时间差进行平均处理, 或去掉多 个时间差中的最大值和最小值, 再将剩余的时间差进行平均处理。 集中控 制器根据第一基站的基准时间以及处理后的时间差, 获取第二基站相对于 第一基站的时间调整量, 即获取非基准基站相对于基准基站的时间调整量。
S303 , 将时间调整量发送给第二基站。 集中控制器获取非基准基站相对于基准基站的时间调整量后, 将时间 调整量发送给非基准基站, 以便非基准基站根据时间调整量进行时间调整, 与基准基站保持时间同步。
基准基站是第一基站, 集中控制器将时间调整量发送给第二基站, 以 便第二基站根据时间调整量进行时间调整, 完成时间同步。
当基站具备上述集中控制器的功能时 , 上述执行主体为基站。
图 4是本发明实施例提供的空口时间同步方案中第一基站的处理方 法, 详细描述如下。
5401 ,根据第一基站和第二基站间切换的第一 UE的非竟争随机接入获 取第一时间差, 第一基站为基准基站, 第二基站为非基准基站。
根据第一基站和第二基站间切换的第一 UE的非竟争随机接入,第一基 站和第二基站分别检测第一 UE的随机接入前导获取接收时刻,第一基站根 据获取的接收时刻计算第一时间差。 第一时间差属于第一类型时间差。
第一时间差可以是根据第一接收时刻和第二接收时刻获取的时间差, 第一接收时刻为第一基站检测到第一随机接入前导的时刻, 第二接收时刻 为第二基站检测到第一随机接入前导的时刻。
第二基站为第一 UE的目标基站,可以检测第一随机接入前导,获取第 二接收时刻; 第一基站启动随机接入前导检测, 也可以检测第一随机接入 前导, 获取第一接收时刻。
第一基站接收第二基站发送的第二接收时刻, 第一基站根据第一接收 时刻和第二接收时刻计算第一基站和第二基站间的第一时间差。
可选的, 第一基站还可以获取第一 UE到第一基站的第一传输时延, 第 二基站也可以获取第一 UE到第二基站的第二传输时延,第一基站可以根据 第一接收时刻、 第一传输时延、 第二接收时刻和第二传输时延计算第一基 站和第二基站间的第一时间差。 第一基站将第一时间差发送给集中控制器。
5402, 第一基站将第一时间差发送给集中控制器, 以便集中控制器判 断获取的至少一个第一类型时间差是否准确, 至少一个第一类型时间差包 括第一时间差。
如果集中控制器判断获取的至少一个第一类型时间差不准确, 则集中 控制器通过主动控制方式获取第二类型时间差, 如果判断获取的至少一个 第一类型时间差准确, 则集中控制器对获取的时间差进行处理。
5403 , 如果第一基站收到集中控制器发送的时间差请求消息, 则第一 基站利用第二 UE 的主动随机接入获取第一基站和第二基站间的第二时间 差。
当集中控制器判断获取的至少一个第一类型时间差不准确时, 如果第 一基站收到集中控制器发送的时间差请求消息, 第一基站选取第二 UE, 利 用第二 UE的主动随机接入获取第二时间差。第二时间差属于第二类型时间 差。
第一基站选取第二 UE后, 向第二 UE分配第三随机接入前导, 通过检 测第三随机接入前导获取第三接收时刻, 根据第三接收时刻和第四接收时 刻, 第一基站计算第一基站和第二基站间的第二时间差, 并将第二时间差 发送给集中控制器, 第四接收时刻为第二基站检测第三随机接入前导的时 刻。
第三随机接入前导为非竟争随机接入前导,以便第二 UE利用第三随机 接入前导向第一基站发起主动随机接入。
可选的,第一基站根据第二 UE测量的第一基站的下行信号强度和第二 基站的下行信号强度进行判断,当该第二 UE的第一基站的下行信号强度与 第二基站的下行信号强度差低于第一门限时, 选定该第二 UE。
5404, 第一基站将第二时间差发送给集中控制器, 以便集中控制器判 断获取的时间差准确后, 集中控制器根据获取的时间差和第一基站的基准 时间获取第二基站的时间调整量。
获取的时间差包括上述至少一个第一类型时间差和至少一个第二类型 时间差, 至少一个第二类型时间差包括第二时间差。 集中控制器对上述获 取的时间差进行判断, 如果判断获取的时间差准确, 则根据获取的时间差 和第一基站的基准时间获取第二基站的时间调整量。
图 5是本发明实施例提供的空口时间同步方案中第二基站的处理方法, 详细描述如下。
5501 , 第二基站获取集中控制器发送的时间调整量。
第二基站接收集中控制器发送的时间调整量, 时间调整量是集中控制 器根据获取的时间差以及第一基站的基准时间, 获取第二基站相对于第一 基站的时间调整量。 获取的时间差可以是至少一个第一类型时间差, 也可 以是至少一个第一类型时间差和至少一个第二类型时间差。
当集中控制器判断至少一个第一类型时间差准确时, 上述获取的时间 差为上述至少一个第一类型时间差, 至少一个第一类型时间差包含第一时 间差,第一时间差是根据第一基站和第二基站间切换的第一 UE的非竟争随 机接入获取的时间差; 或者, 当集中控制器判断至少一个第一类型时间差 不准确时, 上述获取的时间差为上述至少一个第一类型时间差和至少一个 第二类型时间差, 至少一个第二类型时间差包含第二时间差, 第二时间差 为利用第二 UE的主动随机接入获取的时间差。
5502, 第二基站根据时间调整量进行时间调整。
第二基站根据获取的时间调整量进行时间调整, 完成时间同步。
可以理解, 上述集中控制器的处理方法、 第一基站的处理方法以及第 二基站的处理方法对于第二基站收到集中控制器的时间差请求消息也同样 适用。 对于第二基站是基准基站, 第一基站是非基准基站, 上述处理方法 也同样适用。
本实施例中, 如果利用基站间切换的用户设备的非竟争随机接入过程, 通过信令交互获取基站间的第一类型时间差不能满足系统要求, 则利用用 户设备的主动随机接入进一步获取基站间的第二类型时间差。 根据获取的 时间差以及基准基站的基准时间获取非基准基站的时间调整量, 以便非基 准基站根据时间调整量进行时间调整, 实现非基准基站与基准基站的时间 同步。 该空口同步方式不需要采用昂贵的同步设备, 降低了建设和维护成 本, 达到经济、 方便的技术效果。
实施例 2
在图 1 所示的无线通信系统中, 默认情况下, 利用基站间切换的 UE 的非竟争随机接入(站间切换方式获取时间差), 集中控制器获取基站间的 第一类型时间差, 当判断已获取的时间差不满足要求时, 集中控制器会主 动向第一基站或第二基站发送时间差请求消息, 通过第一基站或第二基站 选择 UE发起主动随机接入 (主动控制方式获取时间差), 进一步获取基站 间的第二类型时间差。
图 6是本发明实施例提供的利用站间切换方式进行时间差获取的方法, 描述如下。
5601 ,第一基站根据第一 UE的邻区测量报告,选择第二基站作为目标 基站, 并向第二基站发送切换请求消息。
5602, 第二基站收到第一基站发送的切换请求消息后, 向第一基站发 送切换请求确认消息, 以便第一基站启动随机接入前导检测, 切换请求确 认消息中携带第二基站为第一 UE分配的第一随机接入前导的索引,第一随 机接入前导为用于第一 UE 进行第一基站和第二基站间切换的非竟争随机 接入前导。
5603 , 第一基站收到第二基站发送的切换请求确认消息后, 启动随机 接入前导检测。
5604,第一基站向第一 UE发送切换命令消息,切换命令消息中携带第 二基站为第一 UE分配的第一随机接入前导的索引。第一基站启动随机接入 前导检测可以理解为: 第一基站原本不用检测第一随机接入前导, 为了通 过基站检测随机接入前导获取基站间的时间差, 需要让第一基站进行第一 随机接入前导检测。
S605 ,第一 UE收到第一基站发送的切换命令消息后,根据切换命令消 息中携带第二基站为第一 UE分配的第一随机接入前导的索引,利用第一随 机接入前导向第二基站发起随机接入。 第一随机接入前导的索引与第一随 机接入前导——对应。
由于第一基站启动随机接入前导检测,第一基站也可以对第一 UE向第 二基站发起随机接入的随机接入前导进行检测。 S606(b), 第一基站检测随 机接入前导, 获取第一接收时刻, 第一接收时刻为第一基站检测到第一随 机接入前导的时刻。 S606(a), 第二基站检测随机接入前导, 获取第二接收 时刻,第二接收时刻为第二基站检测到第一随机接入前导的时刻。步骤 S606 ( a )和步骤 S606 ( b )之间不存在特定的先后顺序。
5607 , 第二基站将第二接收时刻发送给第一基站, 以便第一基站获取 第二接收时刻。 优选的, 第一 UE切换到第二基站后, 第二基站向第一基站 发送用户资源译放消息, 在用户资源译放消息中, 携带第二接收时刻。
第一基站获取第二接收时刻, 优选的, 第一基站接收第二基站发送资 源译放消息, 根据用户资源译放消息获取第二接收时刻。
5608 , 第一基站根据上述第一接收时刻和第二接收时刻, 计算第一基 站和第二基站间的第一时间差。
可选的, 在用户资源释放消息中, 携带第一随机接入前导的索引, 第 一基站在计算第一时间差之前, 比较第一接收时刻对应的随机接入前导的 索引和第二接收时刻对应的随机接入前导的索引, 如果相同, 则计算第一 时间差。
第一基站和第二基站间的第一时间差计算如下:
第一时间差 = (第二接收时刻-第一接收时刻); 或者,
第一时间差 = (第一接收时刻-第二接收时刻)。
本发明对第一基站和第二基站间的时间差的计算方式不做限制, 只要 保证时间差的计算方式一致即可, 譬如都是计算第一基站相对于第二基站 的时间差。
图 7是本发明实施例提供的利用站间切换方式进行时间差获取的又一 种方法, 描述如下。
5601 ,第一基站根据第一 UE的邻区测量报告,选择第二基站作为目标 基站, 并向第二基站发送切换请求消息。
S701 ,第一基站向第二基站发送切换请求消息后,触发第一 UE发起随 机接入, 即触发第一 UE进行上行重同步。 具体的, 第一基站向第一 UE发 送物理下行控制信道命令 ( Physical Downlink Control Channel Order, PDCCH Order ) , PDCCH Order中携带第一基站向第一 UE分配的第二随机 接入前导的索引。
S702, 第一 UE收到 PDCCH Order后, 根据 PDCCH Order中携带的第 二随机接入前导的索引对应的第二随机接入前导向第一基站发起随机接 入。
S703 , 第一基站进行随机接入前导检测, 由于第一基站此时是第一 UE 的接入基站, 当检测到第二随机接入前导时,第一基站获取第一 UE到第一 基站的第一传输时延。
5602, 第二基站收到第一基站发送的切换请求消息后, 向第一基站发 送切换请求确认消息,切换请求确认消息中携带第二基站为第一 UE分配的 第一随机接入前导的索引。
5603 , 第一基站收到第二基站发送的切换请求确认消息后, 启动随机 接入前导检测。
5604,第一基站向第一 UE发送切换命令消息,切换命令消息中携带第 二基站为第一 UE分配的第一随机接入前导的索引。
5605,第一 UE收到第一基站发送的切换命令消息后,根据切换命令消 息中携带第二基站为第一 UE分配的第一随机接入前导的索引,利用第一随 机接入前导向第二基站发起随机接入。
S606(b), 第一基站检测随机接入前导, 获取第一接收时刻, 第一接收 时刻为第一基站检测到第一随机接入前导的时刻。 S606(a), 第二基站检测 检测随机接入前导,可以获取第二接收时刻以及第一 UE到第二基站的第二 传输时延, 第二接收时刻为第二基站检测到第一随机接入前导的时刻。
5607, 第二基站将第二接收时刻和第二传输时延发送给第一基站, 以 便第一基站获取第二接收时刻和第二传输时延, 第二传输时延为第一 UE 到第二基站的传输时延。 优选的, 第一 UE切换到第二基站后, 第二基站向 第一基站发送用户资源译放消息,在用户资源译放消息中, 携带第二接收时 刻以及第二传输时延。
第一基站获取第二接收时刻以及第二传输时延, 优选的, 第一基站接 收第二基站发送资源译放消息, 根据用户资源译放消息获取第二接收时刻 以及第二传输时延。
5608, 第一基站根据上述第一接收时刻、 第一传输时延、 第二接收时 刻和第二传输时延, 计算第一基站和第二基站间的第一时间差。
可选的, 在用户资源释放消息中, 携带第一随机接入前导的索引, 第 一基站在计算第一时间差之前, 比较第一接收时刻对应的随机接入前导索 引和第二接收时刻对应的随机接入前导索引, 如果相同, 则计算时间差。
考虑传输时延后, 第一基站和第二基站间的第一时间差计算如下: 第一基站和第二基站间的第一时间差= (第二接收时刻-第一接收时刻)
— (第二传输时延 -第一传输时延), 或者, 第一时间差 = (第一接收时刻-第 二接收时刻 ) - (第一传输时延 -第二传输时延)。
可选的, 对于宏微组网, 第一基站和第二基站间的第一时间差计算如 下:
第一基站和第二基站间的第一时间差= (第二接收时刻-第一接收时刻)
+ (第二传输时延 -第一传输时延), 或者, 第一时间差 = (第一接收时刻-第 二接收时刻 ) + (第一传输时延 -第二传输时延)。
第一基站和第二基站间的时间差的计算方式在各个基站保持一致即 可, 譬如都是计算第一基站相对于第二基站的时间差。
对于 LTE系统, 上述第一接收时刻、 第二接收时刻包括系统帧号、 子 帧号以及子帧内偏差。
上述处理过程基于 X2切换, 当基于 S1切换时, 其处理过程与 X2切 换类似。
第一基站根据第一基站和第二基站间切换的第一 UE 的非竟争随机接 入获取了第一时间差。 第一时间差属于第一类型时间差, 第一类型时间差 是通过站间切换方式获取的时间差。
S609, 第一基站将第一时间差发送给集中控制器。 具体的, 第一基站 向集中控制器发送时间差报告, 时间差报告包含第一基站的标识、 第二基 站的标识, 以及第一时间差, 其中, 标识用以识别基站。 可选的, 根据时 间差报告中两个标识的顺序, 标识的顺序用以指示时间差报告中的第一时 间差是第一基站相对于第二基站的时间差, 或者第一时间差是第二基站相 对于第一基站的时间差。
对于存在从第一基站切换到第二基站的多个 UE, 根据上述方法, 第一 基站获取多个时间差。
可选的, 第一基站可以通过其他自定义消息, 将第一接收时刻或者第 一接收时刻和第一传输时延发送给第二基站, 由第二基站获取第一基站和 第二基站间的第一时间差, 并由第二基站上报给集中控制器, 或者, 第二 基站将获取的第一时间差再发送给第一基站, 由第一基站上报给集中控制 器。
可选的, 第一基站收集多个时间差后, 通过时间差报告, 将多个时间 差统一报给集中控制器, 这种情况下, 时间差报告包含第一基站的标识、 第二基站的标识, 以及多个时间差。 第一基站可以随时按照上述方法获取第一类型时间差, 也可在一定的 时间段获取第一类型时间差。
同理, 集中控制器可以通过第二基站获取第一基站和第二基站之间的 第一类型时间差。
利用第一基站和第二基站之间切换 UE的非竟争随机接入,集中控制器 获取第一基站和第二基站之间的至少一个第一类型时间差, 至少一个第一 类型时间差包含第一时间差。
集中控制器判断上述获取的至少一个第一类型时间差是否准确, 如果 准确, 则集中控制器根据第一基站和第二基站之间的至少一个第一类型时 间差和基准基站的基准时间, 获取非基准基站相对于基准基站的时间调整 量, 当基准基站为第一基站时, 第二基站为非基准基站, 或者, 当基准基 站为第二基站时, 第一基站为非基准基站。
如果不准确, 则集中控制器获取第一基站和第二基站之间的至少一个 第二类型时间差 (第二类型时间差是通过主动控制方式获取的时间差, 即 通过 UE主动随机接入获取的时间差)。集中控制器再判断获取的时间差(包 含已获取的至少一个第一类型时间差和已获取的至少一个第二类型时间 差)是否准确, 如果准确, 则集中控制器根据获取的时间差和基准基站的 基准时间, 获取非基准基站相对于基准基站的时间调整量。
可选的, 如果获取的第一类型时间差不准确, 则集中控制器可以通过 第一基站利用 UE的主动随机接入获取至少一个第二类型时间差,也可以通 过第二基站利用 UE的主动随机接入获取至少一个第二类型时间差。
集中控制器判断获取的时间差是否准确包括:
统计已获取时间差的数量, 如果已获取时间差的数量超过数量门限, 则获得准确的时间差; 或者,
统计已获取时间差的方差, 如果已获取时间差的方差小于方差门限, 则获得准确的时间差; 或者, 比较已获取时间差的两两之间的差值, 如果最小的差值小于最小差值 门限, 即获得准确的时间差。
图 8是本发明实施例提供的利用 UE的主动随机接入进行时间差获取的 方法, 详细描述如下:
S801 , 集中控制器向第一基站发送时间差请求消息, 集中控制器可以 定时向第一基站发送时间差请求消息, 也可以根据第一基站负载情况或业 务情况, 在第一基站相对空闲的状态时, 向第一基站发送时间差请求消息, 还可以根据系统需求, 向第一基站发送时间差请求消息。
S802(a), 第一基站获取集中控制器发送的时间差请求消息后, 选取第 二, 第二 UE为接入第一基站的 UE。
可选的, 第一基站可以获取第二 UE测量的第一基站的下行 RSRP, 及 第二 UE测量的第二基站的下行 RSRP, 第二基站为第一基站的相邻基站, 当第一基站的下行 RSRP和第二基站的下行 RSRP差低于第一门限时,第一 基站认为第二 UE为边缘 UE, 即第二 UE处于第一基站和第二基站覆盖的 交叠区域,可认为第二 UE到第一基站和第二基站的传输时延近似相等, 则 选定该第二 UE , 即第一 UE测量的第一基站的下行信号强度与第二基站的 下行信号强度的差低于第一门限, 下行信号强度可以为下行参考信号接收 功率( Reference Signal Received Power, RSRP ), 也可用其它表征信号强度 的测量量,如信号干扰噪声比( Signal to Interference plus Noise Ratio, SINR )。
S802(b), 第一基站为选择的第二 UE分配第三随机接入前导, 第三随 机接入前导为非竟争随机接入前导,以便第二 UE利用第三随机接入前导向 第一基站发起主动随机接入。
5803 , 第一基站向第二基站发送第三随机接入前导。
5804, 第二基站获取第三随机接入前导后启动随机接入前导检测。 由 于是第一基站的第二 UE主动发起随机接入,第二基站不是第二 UE的服务 基站, 为了通过检测第二 UE的随机接入前导, 获取基站间的时间差, 第二 基站根据从第一基站获取的第三随机接入前导信息, 启动随机接入前导检 测。 第二基站启动随机接入前导检测可以理解为: 第二基站原本不用检测 第三随机接入前导, 为了通过基站检测随机接入前导获取基站间的时间差, 需要让第二基站进行第三随机接入前导检测。
5805 , 第二基站启动随机接入前导检测后, 向第一基站发送随机接入 前导检测启动成功确认消息。
5806, 第一基站收到第二基站发送的随机接入前导检测启动成功确认 消息后, 触发第二 UE发起随机接入, 即触发第二 UE进行上行重同步。 具 体的, 第一基站向第二 UE发送物理下行控制信道命令 ( Physical Downlink Control Channel Order, PDCCH Order ), PDCCH Order中携带第一基站向第 二 UE分配的第三随机接入前导的索引。
5807, 第二 UE收到 PDCCH Order后, 根据 PDCCH Order中携带的第 三随机接入前导的索引对应的第三随机接入前导向第一基站发起随机接 入。
S808(a), 第一基站检测第三随机接入前导, 获取第三接收时刻, 第三 接收时刻为第一基站检测到第三随机接入前导的时刻。
S808(b), 第二基站检测第三随机接入前导, 获取第四接收时刻, 第四 接收时刻为第二基站检测到第三随机接入前导的时刻。 步骤 S808 ( a )和步 骤 S808 ( b )之间不存在特定的先后顺序。
S809第二基站将第四接收时刻发送给第一基站。
S810, 第一基站获取第四接收时刻。 第一基站根据第三接收时刻和第 四接收时刻, 计算第一基站和第二基站间的第二时间差。
可选的, 第二基站将第三随机接入前导的索引与第四接收时刻同时发 送给第一基站, 第一基站在计算第二时间差之前, 比较第三接收时刻对应 的随机接入前导的索引和第四接收时刻对应的随机接入前导的索引, 如果 相同, 则计算第二时间差。 第二时间差计算如下:
第二时间差 = (第四接收时刻-第三接收时刻), 或者,
第二时间差 = (第三接收时刻 -第四接收时刻), 只要保证时间差的计算 方式一致即可, 譬如都是计算第一基站相对于第二基站的时间差。
对于 LTE系统, 上述第一接收时刻、 第二接收时刻包括系统帧号、 子 帧号以及子帧内偏差。
在第二类型时间差获取过程中, 第一基站和第二基站间的信息交互可 以基于 X2接口, 也可以基于 S1接口, 可以扩展现有的接口消息承载上述 信息, 也可以构造新的接口消息承载上述信息。
第一基站根据第二 UE 的主动随机接入获取了第一基站和第二基站间 的第二时间差。
S811 , 第一基站将第二时间差发送给集中控制器。 具体的, 第一基站 向集中控制器发送时间差报告, 时间差报告包含第一基站的标识、 第二基 站的标识, 以及第二时间差, 其中, 标识用以识别基站。 可选的, 根据时 间差报告中两个标识的顺序, 标识的顺序用以指示时间差报告中的第二时 间差是第一基站相对于第二基站的时间差, 或者第二时间差是第二基站相 对于第一基站的时间差。
如果是第二基站收到集中控制器发送的时间差请求, 第二基站的处理 过程与上述第一基站收到时间差请求的处理相同。 下面从第二基站的角度, 描述第二基站收到集中控制器发送的时间差请求时, 通过主动控制获取时 间差方式的详细过程。
集中控制器向第二基站发送时间差请求消息, 第二基站获取集中控制 器发送的时间差请求消息后,选取第二 UE,第二 UE为接入第二基站的 UE。
第二基站为选择的第二 UE分配第三随机接入前导,第三随机接入前导 为非竟争随机接入前导,以便第二 UE利用第三随机接入前导向第二基站发 起主动随机接入。 第二基站向第一基站发送第三随机接入前导信息, 第一基站获取第三 随机接入前导信息后启动随机接入前导检测。 第一基站启动随机接入前导 检测后, 向第二基站发送随机接入前导检测启动成功确认消息。
第二基站收到第一基站发送的随机接入前导检测启动成功确认消息 后,触发第二 UE发起随机接入, 即触发第二 UE进行上行重同步。具体的, 第二基站向第二 UE发送携带第三随机接入前导的索引的 PDCCH Order。
第二基站检测第三随机接入前导, 获取第三接收时刻, 第三接收时刻 为第二基站检测到第三随机接入前导的时刻。
第一基站检测第三随机接入前导, 获取第四接收时刻, 第四接收时刻 为第一基站检测到第三随机接入前导的时刻。 第一基站将第四接收时刻发 送给第二基站。
第二基站获取第四接收时刻。 第二基站根据第三接收时刻和第四接收 时刻, 获取第一基站和第二基站间的第二时间差。
可选的, 第一基站将第三随机接入前导的索引与第四接收时刻同时发 送给第二基站, 第二基站在计算第二时间差之前, 比较第三接收时刻对应 的随机接入前导的索引和第四接收时刻对应的随机接入前导的索引, 如果 相同, 则计算第二时间差。
第二基站将第二时间差发送给集中控制器。 发送方式与第一基站发送 时间差的方式相同。
集中控制器可以向第一基站或第二基站发送多次时间差请求消息, 获 取多个第二类型时间差。
集中控制器通过主动控制获取时间差方式,利用 UE的主动随机接入获 取第一基站和第二基站间的至少一个第二类型时间差, 至少一个第二类型 时间差包括第二时间差。
通过站间切换方式和主动控制方式, 集中控制器获取第一基站和第二 基站间的多个时间差 (包括至少一个第一类型时间差和至少一个第二类型 时间差), 再次判断上述获取的多个时间差是否准确, 如果准确, 则集中控 制器根据获取的多个时间差和基准基站的基准时间, 获取非基准基站相对 于基准基站的时间调整量, 当基准基站为第一基站时, 第二基站为非基准 基站, 或者, 当基准基站为第二基站时, 第一基站为非基准基站。
如果不准确, 则集中控制器再进一步获取第一基站和第二基站之间的 第二类型时间差。
集中控制器在主动控制获取时间差方式下, 可以每获取一个第二类型 时间差就进行一次时间差准确与否的判断。
可选的, 集中控制器为站间切换获取时间差方式设置第一定时器, 为 主动控制获取时间差方式设置第二定时器, 图 9是本发明实施例提供的利 用定时器进行时间差处理的方法。 启动第一定时器后, 集中控制器在第一 定时器超时前, 通过站间切换方式获取第一基站和第二基站之间的第一类 型时间差, 第一定时器超时后, 启动第二定时器, 判断在第一定时器超时 前获取的第一类型时间差是否准确, 如果准确, 则集中控制器对获取的时 间差进行处理, 根据获取的时间差和基准基站的基准时间, 获取非基准基 站相对于基准基站的时间调整量; 如果不准确, 则向第一基站或第二基站 发送时间差请求消息, 通过主动控制方式获取第二类型时间差, 直到判断 所获取的时间差准确为止或第二定时器超时。 如果获取的第一类型时间差 和第二类型时间差准确, 则集中控制器对获取的时间差进行处理, 根据获 取的时间差和基准基站的基准时间, 获取非基准基站相对于基准基站的时 间调整量。 其中, 第二定时器的时间长度可以预先设定, 确保能够获取准 确的时间差。
当基准基站为第一基站时, 则第二基站为非基准基站, 集中控制器根 据获取的时间差和第一基站的基准时间, 获取第二基站相对于第一基站的 时间调整量, 即获取非基准基站相对于基准基站的时间调整量。
具体的, 集中控制器对获取的时间差进行处理, 获取第二基站相对于 第一基站的时间差。 对于只有一个时间差的情况, 集中控制器根据第二基 站相对于第一基站的时间差, 可得到第二基站相对于基准基站的时间调整 量, 即非基准基站相对于基准基站的时间调整量; 对于多个时间差的情况, 集中控制器对第二基站相对于第一基站的时间差进行处理, 具体可以是对 上述时间差进行平均处理、 或是将相差最小的两个时间差进行平均处理、 或是去掉至少一个时间差中的最大值和最小值, 将剩余的时间差进行平均 处理, 得到第二基站相对于第一基站的时间差, 即平均时间差; 集中控制 器再根据基准基站的基准时间, 获取第二基站相对于基准基站的时间调整 量, 即非基准基站相对于基准基站的时间调整量。
集中控制器向第二基站发送时间调整量, 即向非基准基站发送时间调 整量, 具体的, 集中控制器向第一基站发送时间调整命令消息, 时间调整 命令消息中携带时间调整量和第一基站的标识。
可选的, 集中控制器在向第二基站发送时间调整量之前进行判断, 如 果第二基站, 即非基准基站需要进行时间调整, 则集中控制器向第二基站 发送时间调整量。
第二基站接收到集中控制器发送的时间调整量, 根据时间调整量进行 时间调整, 完成时间同步。 具体的, 第二基站接收到集中控制器发送的时 间调整命令消息, 获取时间调整量, 根据时间调整量进行时间调整, 完成 时间同步。
当基准基站为第二基站时, 第一基站为非基准基站, 集中控制器根据 获取的时间差和基准基站的基准时间, 获取第一基站相对于第二基站的时 间调整量, 即可获取非基准基站相对于基准基站的时间调整量。
集中控制器向第一基站发送时间调整量, 即向非基准基站发送时间调 整量。 第一基站接收到集中控制器发送的时间调整量, 根据时间调整量进 行时间调整, 完成时间同步。
本实施例中, 如果利用基站间切换的用户设备的非竟争随机接入过程, 通过信令交互获取基站间的第一类型时间差不能满足系统要求, 则利用用 户设备的主动随机接入过程, 进一步获取基站间的第二类型时间差。 根据 获取的时间差以及基准基站的基准时间获取非基准基站的时间调整量, 以 便非基准基站根据时间调整量进行时间调整, 实现非基准基站与基准基站 的时间同步。 该空口同步方式不需要采用昂贵的同步设备, 降低了建设和 维护成本, 达到经济、 方便的技术效果。
实施例 3
参见图 1 , 集中控制器 101独立于基站外, 以基站 102a为基准基站, 基站 102b通过空口与基准基站进行时间同步过程详细描述如下。
当存在从基站 102a切换到基站 102b的 UE103a, 基站间的第一类型时 间差获取过程与实施例 2相同, 基站 102a作为第一基站, 基站 102b作为 第二基站, 基站 102a获取第一时间差后上报给集中控制器 101 , 第一时间 差属于第一类型时间差。
当存在从基站 102b切换到基站 102a的 UE103b, 基站间的第一类型时 间差获取过程与实施例 2相同, 基站 102a作为第二基站, 基站 102b作为 第一基站, 基站 102b获取时间差后上报给集中控制器 101。
如果存在从基站 102a切换到基站 102b的多个 UE, 根据上述方法, 基 站 102a可获取多个第一类型时间差并上报给集中控制器 101 , 如果存在从 基站 102b切换到基站 102a的多个 UE, 基站 102b也可获取多个第一类型 时间差并上 给集中控制器 101。
通过站间切换方式, 集中控制器 101从基站 102a和 /或基站 102b获取 基站 102a和基站 102b之间的至少一个第一类型时间差。
集中控制器 101 判断上述获取的至少一个第一类型时间差是否准确, 如果准确, 则集中控制器 101根据基站 102a和基站 102b之间的至少一个 第一类型时间差和基准基站(即基站 102a ) 的基准时间, 获取非基准基站 相对于基准基站的时间调整量, 即基站 102b相对于基站 102a的时间调整 量。
如果判断获取的至少一个第一类型时间差不准确, 则集中控制器 101 向基站 102a和 /或基站 102b发送时间差请求消息, 利用基站 102a和 /或基 站 102b选取的 UE发起主动随机接入, 通过主动控制方式获取至少一个第 二类型时间差。
集中控制器 101可以向基站 102a发送时间差请求消息, 也可以向基站 102b发送时间差请求消息, 还可以既向基站 102a又向基站 102b发送时间 差请求消息。 集中控制器 101向基站 102a和 /或基站 102b发送时间差请求 消息获取至少一个第二类型时间差的过程可参见实施例 2的相关描述。
通过站间切换方式和主动控制方式, 集中控制器 101获取基站 102a和 基站 102b间的多个时间差(包括至少一个第一类型时间差和至少一个第二 类型时间差), 再次判断上述获取的多个时间差是否准确, 如果不准确, 则 集中控制器 101再向基站 101a和 /或基站 102b发送时间差请求消息, 进一 步获取第二类型时间差。 如果准确, 则集中控制器 101 根据获取的多个时 间差和基准基站 (基站 102a ) 的基准时间, 获取非基准基站相对于基准基 站的时间调整量, 即获取基站 102b相对于基站 102a的时间调整量。
集中控制器 101向基站 102b发送时间调整量, 即向非基准基站发送时 间调整量。
可选的, 集中控制器 101 在发送时间调整量之前进行判断, 如果基站 102b, 即非基准基站需要进行时间调整, 则集中控制器 101向基站 102b发 送时间调整量。
基站 102b接收到集中控制器 101发送的时间调整量,获取时间调整量, 根据时间调整量进行时间调整, 完成时间同步。
本实施例中, 如果利用基站间切换的用户设备的非竟争随机接入过程, 通过信令交互获取基站间的第一类型时间差不能满足系统要求, 则利用用 户设备的主动随机接入过程, 进一步获取基站间的第二类型时间差。 根据 获取的时间差以及基准基站的基准时间获取非基准基站的时间调整量, 以 便非基准基站根据时间调整量进行时间调整, 实现非基准基站与基准基站 的时间同步。 该空口同步方式不需要采用昂贵的同步设备, 降低了建设和 维护成本, 达到经济、 方便的技术效果。
实施例 4
参见图 1 , 集中控制器 101独立于基站外, 以基站 102a为基准基站, 基站 102c通过空口与基准基站进行时间同步详细描述如下。
基站 102c和基站 102b之间的时间差获取过程如实施例 2或实施例 3 中的描述。
为获取基站 102c和基站 102a之间的时间差, 还需要获取基站 102b和 基站 102a之间的时间差。
基站 102b和基站 102a之间的时间差获取过程如实施例 2或实施例 3 中的描述。
集中控制器 101根据基站 102c相对于基站 102b的时间差, 以及基站 102b相对于基站 102a的时间差, 可以获取基站 102c相对于基站 102a的时 间差, 由于基站 102a为基准基站, 即可获取基站 102c相对于基准基站的时 间调整量, 即非基准基站相对于基准基站的时间调整量。
集中控制器 101向基站 102c发送时间调整量基站 102c接收到集中控制 器 101 发送的时间调整量, 根据时间调整量, 进行时间调整, 完成时间同 步。
在该实施例中, 集中控制器 101也可以向基站 102b发送时间调整量。 基站 102b接收到集中控制器 101发送的时间调整量, 根据时间调整量, 进 行时间调整, 完成时间同步。
本实施例中, 如果利用基站间切换的用户设备的非竟争随机接入过程, 通过信令交互获取基站间的第一类型时间差不能满足系统要求, 则利用用 户设备的主动随机接入过程, 进一步获取基站间的第二类型时间差。 根据 获取的时间差以及基准基站的基准时间获取非基准基站的时间调整量, 以 便非基准基站根据时间调整量进行时间调整, 实现非基准基站与基准基站 的时间同步。 该空口同步方式不需要采用昂贵的同步设备, 降低了建设和 维护成本, 达到经济、 方便的技术效果。
实施例 5
当基站包含集中控制器的功能时, 空口时间同步处理方法详细描述如 下。
图 10是本发明实施例提供的空口同步方案中第一基站的另一种处理方 法。
51001 , 根据第一基站和第二基站间切换的第一 UE的非竟争随机接入 获取第一时间差。
根据第一基站和第二基站间切换的第一 UE的非竟争随机接入,第一基 站和第二基站分别检测第一 UE的随机接入前导获取接收时刻,第一基站根 据获取的接收时刻计算第一时间差。 第一时间差属于第一类型时间差。
第一基站根据第一接收时刻和第二接收时刻计算第一基站和第二基站 间的第一时间差, 第一接收时刻为第一基站检测到第一随机接入前导的时 刻, 第二接收时刻为第二基站检测到第一随机接入前导的时刻, 第一随机 接入前导为用于第一 UE进行第一基站和第二基站间切换的非竟争随机接 入前导, 是第二基站为第一 UE分配的随机接入前导, 以便第一 UE根据第 一随机接入前导向第二基站发起随机接入。
第一基站还可以根据第一接收时刻、 第一传输时延、 第二接收时刻和 第二传输时延计算第一时间差,第一传输时延是第一 UE到第一基站的传输 时延, 第二传输时延为第一 UE到第二基站的传输时延。
51002, 第一基站将第一时间差发送给第二基站, 以便第二基站判断获 取的至少一个第一类型时间差是否准确, 至少一个第一类型时间差包括第 一时间差。 如果第二基站判断获取的至少一个第一类型时间差不准确, 则第二基 站通过主动控制方式获取第二类型时间差, 如果判断获取的至少一个第一 类型时间差准确, 则第二基站对获取的时间差进行处理。
51003 , 如果第一基站收到第二基站发送的时间差请求消息, 则第一基 站利用第二 UE的主动随机接入获取第一基站和第二基站间的第二时间差。
当第二基站判断获取的至少一个第一类型时间差不准确时, 如果第一 基站收到第二基站发送的时间差请求消息, 第一基站选取第二 UE, 利用第 二 UE的主动随机接入获取第二时间差。 第二时间差属于第二类型时间差。
第一基站选取第二 UE后, 向第二 UE分配第三随机接入前导, 通过检 测第三随机接入前导获取第三接收时刻, 根据第三接收时刻和第四接收时 刻, 第一基站计算第一基站和第二基站间的第二时间差, 并将第二时间差 发送给第二基站, 第四接收时刻为第二基站检测第三随机接入前导的时刻。 第三随机接入前导为非竟争随机接入前导,以便第二 UE利用第三随机接入 前导向第一基站发起主动随机接入。
51004, 第一基站将第二时间差发送给第二基站, 以便第二基站判断获 取的时间差准确后, 第二基站根据获取的时间差和基准基站的基准时间获 取非基准基站的时间调整量。
获取的时间差包括上述至少一个第一类型时间差和至少一个第二类型 时间差, 至少一个第二类型时间差包括第二时间差。
当基准基站为第二基站时, 非基准基站为第一基站; 或者, 当基准基 站为第一基站时, 非基准基站为第二基站。 第二基站对上述获取的时间差 进行判断, 如果判断获取的时间差准确, 则获取非基准基站的时间调整量。
非基准基准获取时间调整量后进行时间调整。
图 11是本发明实施例提供的空口同步方案中第二基站的另一种处理方 法。
S1101 , 获取至少一个第一类型时间差, 至少一个第一类型时间差包含 第一时间差,第一时间差为根据第一基站和第二基站间切换的第一 UE的非 竟争随机接入获取的时间差。
第二基站获取第一基站和第二基站间的至少一个第一类型时间差, 至 少一个第一类型时间差包含第一时间差。 第一时间差可以是根据第一接收 时刻和第二接收时刻计算得到的时间差, 也可以是根据第一接收时刻、 第 一传输时延、 第二接收时刻和第二传输时延获取的第一基站和第二基站间 时间差。 第一接收时刻为第一基站检测到第一随机接入前导的时刻, 第二 接收时刻为第二基站检测到第一随机接入前导的时刻, 第一传输时延是第 一 UE到第一基站的传输时延,第二传输时延是第一 UE到第二基站的传输 时延。
如果存在多个 UE, 利用上述过程, 集中控制器可以获取多个第一类型 时间差。
S1102, 根据所述至少一个第一类型时间差和基准基站的基准时间, 获 取非基准基站的时间调整量, 其中, 所述基准基站为所述第二基站, 所述 非基准基站为所述第一基站, 或者, 所述基准基站为所述第一基站, 所述 非基准基站为所述第二基站。
当所述至少一个第一类型时间差准确时, 所述第二基站根据所述至少 一个第一类型时间差和基准基站的基准时间, 获取非基准基站的时间调整 量。
可选的, 第二基站判断获取的至少一个第一类型时间差是否准确。 第二基站对获取的至少一个第一类型时间差的准确判断方法与实施例 1中的集中控制器对时间差的准确判断方法相同。
当至少一个第一类型时间差不准确时, 第二基站获取至少一个第二类 型时间差, 至少一个第二类型时间差包含第二时间差, 第二基站可以向第 一基站发送时间差请求消息, 以便第一基站选择第二 UE, 并利用第二 UE 的主动随机接入获取第二时间差。 第二基站可以定时向第一基站发送时间差请求消息, 也可以根据第一 基站负载情况或业务情况, 在第一基站相对空闲的状态时, 向第一基站发 送时间差请求消息, 还可以根据系统需求, 向第一基站发送时间差请求消 息。
当已获取的时间差 (包含至少一个第一类型时间差和至少一个第二类 型时间差) 准确时, 第二基站对获取的时间差进行处理, 第二基站对获取 的时间差的处理方法与实施例 1 中集中控制器的处理方法相同。 第二基站 根据处理得到的时间差和基准基站的基准时间, 确定非基准基站的时间调 整量。
如果只有一个时间差, 则第二基站直接根据这一个时间差和基准基站 的基准时间, 确定非基准基站的时间调整量。
S1103 , 将时间调整量发送给非基准基站。
第二基站将时间调整量发送给非基准基站, 以便非基准基站根据获取 的时间调整量进行时间调整, 完成时间同步
如果基准基站是第二基站, 第二基站向第一基站发送时间调整量, 以 便第一基站根据时间调整量进行时间调整; 或者, 如果基准基站是第一基 站, 第二基站直接根据时间调整量进行时间调整。
本实施例中, 如果利用基站间切换的用户设备的非竟争随机接入过程, 通过信令交互获取基站间的第一类型时间差不能满足系统要求, 则利用用 户设备的主动随机接入过程, 进一步获取基站间的第二类型时间差。 根据 获取的时间差以及基准基站的基准时间获取非基准基站的时间调整量, 以 便非基准基站根据时间调整量进行时间调整, 实现非基准基站与基准基站 的时间同步。 该空口同步方式不需要采用昂贵的同步设备, 降低了建设和 维护成本, 达到经济、 方便的技术效果。
实施例 6
在该实施例中, 第二基站具备实施例 2 中的集中控制器功能, 空口时 间同步方法详细描述如下。
根据第一基站和第二基站间切换的第一 UE 的非竟争随机接入获取第 一类型时间差, 第一基站的处理方法以及第二基站的处理方法与实施例 2 中的描述相似, 区别在于, 在该实施例中, 第一基站将第一时间差发送给 第二基站, 以便第二基站对获取的时间差进行判断并处理, 第一时间差属 于第一类型时间差。
利用第一基站和第二基站之间切换 UE的非竟争随机接入,第二基站获 取第一基站和第二基站之间的至少一个第一类型时间差, 至少一个第一类 型时间差包含第一时间差。
第二基站判断上述获取的至少一个第一类型时间差是否准确, 如果准 确, 则第二基站根据第一基站和第二基站之间的至少一个第一类型时间差 和基准基站的基准时间, 获取非基准基站相对于基准基站的时间调整量, 当基准基站为第一基站时, 第二基站为非基准基站, 或者, 当基准基站为 第二基站时, 第一基站为非基准基站。
如果不准确, 则第二基站获取第一基站和第二基站之间的至少一个第 二类型时间差 (第二类型时间差是通过主动控制方式获取的时间差, 即通 过 UE主动随机接入获取的时间差)。 第二基站再判断获取的时间差 (包含 已获取的至少一个第一类型时间差和已获取的至少一个第二类型时间差) 是否准确, 如果准确, 则第二基站根据获取的时间差和基准基站的基准时 间, 获取非基准基站相对于基准基站的时间调整量。
可选的, 如果获取的第一类型时间差不准确, 则第二基站可以通过第 一基站利用 UE的主动随机接入获取至少一个第二类型时间差,也可以通过 第二基站本身利用 UE的主动随机接入获取至少一个第二类型时间差。
第二基站判断获取的时间差是否准确与实施例 2 中集中控制器的判断 方法才目同。
利用 UE的主动随机接入获取第二类型时间差,第一基站的处理方法以 及第二基站的处理方法与实施例 2 中的描述相似, 区别在于, 在该实施例 中, 第一基站将第二时间差发送给第二基站, 以便第二基站对获取的时间 差进行判断并处理第二时间差属于第二类型时间差。
利用 UE的主动随机接入,第二基站获取第一基站和第二基站间的至少 一个第二类型时间差, 至少一个第二类型时间差包括第二时间差。
第二基站对获取的时间差进行处理, 获取的时间差包括至少一个第一 类型时间差和至少一个第二类型时间差, 其处理方法与实施例 2 中集中控 制器对获取的时间差的处理方法相同。
当基准基站为第二基站时, 则第一基站为非基准基站, 第二基站根据 获取的时间差和基准基站的基准时间, 获取第一基站相对于第二基站的时 间调整量, 即可获取非基准基站相对于基准基站的时间调整量。 第二基站 向第一基站发送时间调整量, 即向非基准基站发送时间调整量, 第一基站 接收到第二基站发送的时间调整量, 根据时间调整量进行时间调整, 完成 时间同步。
当基准基站为第一基站时, 第二基站为非基准基站, 第二基站根据获 取的时间差和基准基站的基准时间, 获取第二基站相对于第一基站的时间 调整量, 即可获取非基准基站相对于基准基站的时间调整量。 第二基站向 第二基站发送时间调整量, 即向非基准基站发送时间调整量。 这种情况下, 由于第二基站具有集中控制器的功能, 第二基站直接根据时间调整量进行 时间调整, 完成时间同步。
本实施例中, 如果利用基站间切换的用户设备的非竟争随机接入过程, 通过信令交互获取基站间的第一类型时间差不能满足系统要求, 则利用用 户设备的主动随机接入过程, 进一步获取基站间的第二类型时间差。 根据 获取的时间差以及基准基站的基准时间获取非基准基站的时间调整量, 以 便非基准基站根据时间调整量进行时间调整, 实现非基准基站与基准基站 的时间同步。 该空口同步方式不需要采用昂贵的同步设备, 降低了建设和 维护成本, 达到经济、 方便的技术效果。
实施例 7
图 2为第一基站、 第二基站以及集中控制器的结构示意图。 以第一基 站为基准基站, 第二基站为非基准基站为例进行描述。
第一基站, 包括时间差计算单元 1031和时间差发送单元 1036。
时间差计算单元 1031 ,用于根据第一基站和第二基站间切换的第一 UE 的非竟争随机接入获取第一时间差, 第一基站为基准基站, 第二基站为非 基准基站。
时间差发送单元 1036,用于将时间差计算单元 1031获取的第一时间差 发送给集中控制器, 以便集中控制器判断获取的至少一个第一类型时间差 是否准确, 所述至少一个第一类型时间差包括所述第一时间差。
可选的, 时间差计算单元 1031 , 用于根据第一接收时刻和第二接收时 刻计算第一时间差。 为了获取的第一接收时刻和第二接收时刻, 第一基站 还包括:
随机接入前导检测单元 1028, 用于检测第一随机接入前导, 第一随机 接入前导为用于第一 UE进行第一基站和第二基站间切换的非竟争随机接 入前导。
时间信息获取单元 1030,用于当随机接入前导检测单元 1028检测到所 述第一随机接入前导时, 获取第一接收时刻, 第一接收时刻为随机接入前 导检测单元 1028检测到第一随机接入前导的时刻;时间信息获取单元 1030, 还用于获取第二接收时刻, 第二接收时刻为第二基站检测到第一随机接入 前导的时刻。
可选的, 第一基站还包括移动性管理单元 1032, 用于根据第一 UE的 邻区测量^艮告, 向第二基站发送切换请求消息, 当移动性管理单元 1032收 到第二基站发送的切换请求确认消息后, 随机接入前导检测单元 1028启动 随机接入前导检测。 接收所述第二基站发送的切换请求确认消息后, 移动 性管理单元 1032用于向第一 UE发送切换命令消息, 以便第一 UE根据所 述第一随机接入前导向第二基站发起随机接入, 其中, 切换请求确认消息 和切换命令消息中携带第一随机接入前导的索引, 第一随机接入前导为第 二基站为第一 UE分配的非竟争随机接入前导;
可选的, 时间差计算单元 1031 , 用于根据第一接收时刻、 第一传输时 延、 第二接收时刻和第二传输时延计算第一时间差。 第一传输时延是第一 UE到第一基站的传输时延, 第二传输时延为第一 UE到第二基站的传输时 延。
第一基站还包括资源映射单元 1021 , 用于, 当移动性管理单元 1032向 第二基站发送切换请求消息后, 向第一 UE发送 PDCCH Order, PDCCH Order中携带第二随机接入前导的索引, 以便第一 UE收到 PDCCH Order 后, 根据第二随机接入前导向第一基站发起主动随机接入; 随机接入前导 管理单元 1029, 用于向第一 UE分配第二随机接入前导。
随机接入前导检测单元 1028, 还用于检测第二随机接入前导, 当检测 到第二随机接入前导时, 时间信息获取单元 1030, 获取第一 UE到第一基 站的第一传输时延。
可选的, 时间信息获取单元 1030, 用于获取第二基站发送的第二传输 时延。
可选的, 移动性管理单元 1032, 还用于接收第二基站发送的用户资源 译放消息, 在用户资源译放消息中携带第二接收时刻或第二接收时刻和第 二传输时延。 移动性管理单元 1032接收到用户资源译放消息后, 时间信息 获取单元 1030获取第二接收时刻或第二接收时刻和第二传输时延, 以便时 间差计算单元 1031计算第一时间差。
可选的, 第一时间差 = (第二接收时刻 -第一接收时刻); 或者, 第一时 间差 = (第一接收时刻-第二接收时刻)。
可选的, 第一时间差 = (第二接收时刻-第一接收时刻) - (第二传输时 延 -第一传输时延); 或者, 第一时间差 = (第一接收时刻-第二接收时刻) - (第一传输时延-第二传输时延)。
可选的, 第一时间差 = (第二接收时刻-第一接收时刻 ) + (第二传输时 延 -第一传输时延); 或者, 第一时间差 = (第一接收时刻-第二接收时刻) + (第一传输时延-第二传输时延)。
可选的, 第一基站, 还包括用户选取单元 1037。
用户选取单元 1037, 用于收到集中控制器发送的时间差请求消息后, 选取第二 UE, 可选的, 当第二 UE测量的第一基站的下行信号强度与第一 UE测量的第二基站的下行信号强度差低于第一门限时, 选取该第二 UE。
时间差计算单元 1031 ,还用于根据用户选取单元 1037选取的所述第二 UE, 利用第二 UE的主动随机接入获取第一基站和第二基站间的第二时间 差。
时间差发送单元 1036,还用于将时间差计算单元 1031获取的第二时间 差发送给集中控制器, 以便集中控制器判断已获取的时间差准确后, 根据 已获取的时间差和第一基站的基准时间获取第二基站的时间调整量, 已获 取的时间差包括上述至少一个第一类型时间差和至少一个第二类型时间 差, 至少一个第二类型时间差包括第二时间差。
可选的,为了利用第二 UE的主动随机接入获取的第三接收时刻和第四 接收时刻从而计算第一基站和第二基站间的第二时间差, 随机接入前导管 理单元 1029,还用于向用户选取单元 1037选择的所述第二 UE分配第三随 机接入前导, 并将第三随机接入前导信息发送给第二基站, 以便所述第二 基站获取所述第三随机接入前导信息后启动随机接入前导检测; 随机接入 前导管理单元 1029, 还用于接收第二基站发送的随机接入前导检测启动成 功确认消息。
随机接入前导检测单元 1028, 还用于检测所述第二 UE发起主动随机 接入使用的所述第三随机接入前导。 时间信息获取单元 1030, 还用于获取第三接收时刻和第四接收时刻, 第三接收时刻为随机接入前导检测单元 1028检测到第三随机接入前导的时 刻, 第四接收时刻为第二基站检测到第三随机接入前导的时刻。
可选的, 资源映射单元 1021 , 还用于当随机接入前导管理单元接收第 二基站发送的随机接入前导检测启动成功确认消息后,触发第二 UE利用第 三随机接入前导向第一基站发起主动随机接入。 通过资源映射单元 1021向 第二 UE发送 PDCCH Order, PDCCH Order中携带第三随机接入前导的索 引, 第二 UE根据第三随机接入前导向第一基站发起主动随机接入。
第二基站, 包括调整量获取单元 1034和时间调整单元 1035。
调整量获取单元 1034, 用于接收集中控制器发送的时间调整量, 其中, 时间调整量是由集中控制器根据获取的时间差和第一基站的基准时间, 获 取的第二基站的时间调整量, 当集中控制器判断至少一个第一类型时间差 准确时, 获取的时间差为至少一个第一类型时间差, 至少一个第一类型时 间差包含第一时间差, 第一时间差是根据第一基站和第二基站间切换的第 一 UE的非竟争随机接入获取的时间差,或者, 当集中控制器判断至少一个 第一类型时间差不准确时, 获取的时间差为至少一个第一类型时间差和一 个第二类型时间差, 至少一个第二类型时间差包含第二时间差, 第二时间 差为利用第二 UE的主动随机接入获取的时间差。
时间调整单元 1035,用于根据调整量获取单元 1034获取的时间调整量, 进行时间调整, 完成和第一基站的时间同步, 即与基准基站保持时间同步。
由于第一 UE从第一基站切换到第二基站,为了根据第一基站和第二基 站检测第一 UE的非竟争随机接入前导获取接收时刻,配合第一基站计算第 一时间差, 第二基站还包括: 随机接入前导管理单元 1029、 移动性管理单 元 1032、 随机接入前导检测单元 1028和时间信息获取单元 1030。
随机接入前导管理单元 1029, 用于为第一 UE分配第一随机接入前导, 第一随机接入前导为用于第一 UE 进行第一基站和第二基站间切换的非竟 争随机接入前导。
移动性管理单元 1032, 用于收到第一基站发送切换请求消息后, 向第 一基站发送切换请求确认消息, 以便第一基站启动随机接入前导检测, 切 换请求确认消息中携带随机接入前导管理单元为第一 UE 分配的第一随机 接入前导的索引。
随机接入前导检测单元 1028 , 用于检测第一随机接入前导。
时间信息获取单元 1030,用于通过随机接入前导检测单元 1028检测到 第一随机接入前导, 获取第二接收时刻; 可选的, 还可以获取第二接收时 刻和第二传输时延, 第二传输时延是第一 UE到第二基站的传输时延。
移动性管理单元 1032,还用于将时间信息获取单元 1030获取的所述第 二接收时刻发送给所述第一基站, 以便第一基站获取第一基站和第二基站 间的第一时间差; 可选的, 将时间信息获取单元 1030获取的第二接收时刻 和第二传输时延发送给第一基站。 优选的, 当第一 UE切换到第二基站后, 移动管理单元 1032向第一基站发送用户资源译放消息, 在用户资源译放消 息中携带第二接收时刻或者用户资源译放消息中携带第二接收时刻和第二 传输时延。
随机接入前导管理单元 1029, 还用于接收所述第一基站发送的第三随 机接入前导,所述第三随机接入前导为所述第一基站为所述第二 UE分配的 用于主动随机接入的非竟争随机接入前导;
随机接入前导检测单元 1028 , 还用于当所述随机接入前导管理单元 1029接收到所述第一基站发送的第三随机接入前导后, 启动随机接入前导 检测;
随机接入前导管理单元 1029 , 还用于当所述随机接入前导检测单元 1028启动随机接入前导检测后, 向所述第一基站发送随机接入前导检测启 动成功确认消息,以便所述第一基站触发所述第二 UE利用所述第三随机接 入前导进行主动随机接入; 随机接入前导检测单元 1028, 还用于检测所述第二 UE发起主动随机 接入使用的所述第三随机接入前导;
时间信息获取单元 1030,还用于当所述随机接入前导检测单元 1028检 测到所述第三随机接入前导时, 获取第四接收时刻, 并将所述第四接收时 刻发送给所述第一基站, 以便所述第一基站根据第三接收时刻和所述第四 接收时刻计算所述第二时间差, 所述第三接收时刻为所述第一基站检测到 所述第三随机接入前导的时刻。
可以理解,对于利用检测切换 UE的随机接入前导计算时间差, 第一基 站和第二基站可以互换。 该实施例中, 第二基站可以包含第一基站的上述 单元并执行相应的功能, 第一基站也可以包含第二基站的上述单元并执行 相应的功能, 即对于从第二基站切换到第一基站的 UE, 可由第二基站的时 间差发送单元 1036将时间差计算单元 1031得到的时间差发送给集中控制 器。
集中控制器装置包括第一类型时间差获取单元 1014、 时间调整量处理 单元 1011和调整量发送单元 1012。
第一类型时间差获取单元 1014, 用于获取至少一个第一类型时间差, 至少一个第一类型时间差包含第一时间差, 第一时间差为根据第一基站和 第二基站间切换的第一 UE的非竟争随机接入获取的时间差。
时间调整量处理单元 1011 , 用于根据所述至少一个第一类型时间差和 第一基站的基准时间, 获取第二基站的时间调整量, 其中, 第一基站是基 准基站, 第二基站是非基准基站。 时间调整量处理单元 1011对获取的时间 差需进行处理, 对于至少两个时间差的情况, 可以进行平均处理, 或者, 将相差最小的两个时间差进行平均处理, 或者, 去掉多个时间差中的最大 值和最小值, 将剩余的时间差进行平均处理, 将平均处理得到的平均时间 差与基准时间相比, 获取时间调整量。 可以理解, 对以只有一个时间差的 情况, 可以作为多个时间差的一种特例。 可选的, 时间调整量处理单元 1011 , 还用于, 当所述至少一个第一类 型时间差准确时, 根据所述至少一个第一类型时间差和所述第一基站的基 准时间, 获取所述第二基站的时间调整量。
可选的, 时间调整量处理单元 1011用于判断至少一个第一类型时间差 是准确的, 包括:
统计所述至少一个第一类型时间差的数量, 如果所述数量超过数量门 限, 则所述至少一个第一类型时间差准确; 或者,
统计所述至少一个第一类型时间差的方差, 如果所述方差小于方差门 限, 则所述至少一个第一类型时间差准确; 或者,
比较所述至少一个第一类型时间差中的任意两个时间差之间的差值, 如果最小的差值小于最小差值门限, 则所述至少一个第一类型时间差准确。
调整量发送单元 1012,用于将时间调整量处理单元 1011获取的时间调 整量发送给所述第二基站, 可选的, 根据时间调整量, 判断第二基站是否 需要进行时间调整, 如果第二基站需要进行时间调整, 则将时间调整量发 送给第二基站。
可选的, 当至少一个第一类型时间差不准确时, 集中控制器还包括第 二类型时间差获取单元 1015。
第二类型时间差获取单元 1015 , 用于获取至少一个第二类型时间差, 至少一个第二类型时间差包含第二时间差,第二时间差为利用第二 UE的主 动随机接入获取的时间差。
可选的, 集中控制器还包括时间差请求单元 1013 , 用于向第一基站发 送时间差请求消息, 以便第一基站获取所述第二时间差并将第二时间差发 送给第二类型时间差获取单元 1015。时间差请求单元 1013可以定时向所述 第一基站发送所述时间差请求消息; 或者, 根据所述第一基站负载情况, 当所述第一基站负载低于负载门限时, 时间差请求单元 1013向所述第一基 站发送所述时间差请求消息。 可选的, 时间调整量处理单元 1011 , 还用于当获取的时间差准确时, 根据已获取的时间差和第一基站的基准时间, 获取第二基站的时间调整量, 上述已获取的时间差包括第一类型时间差获取单元 1014获取的至少一个第 一类型时间差和第二类型时间差获取单元 1015获取的至少一个第二类型时 间差。
可选的, 集中控制器还包括接口单元 1016, 用于完成集中控制器与基 站间的信息交互。
可选的, 第一基站和第二基站还包括: 信道调制单元 1022、 调度单元 1023、 中射频单元 1024、 信道估计单元 1025、 信道解调单元 1026、 信道分 离单元 1027以及接口单元 1033。 调度单元 1023由下行调度单元 10231和 上行调度单元 10232组成。下行调度单元 10231用于根据 UE反馈的信道信 息和来自高层的用户相关信息, 进行下行资源调度。 上行调度单元 10232 用于根据来自信道估计单元 1025的上行链路的信道估计结果和来自 UE的 资源请求, 进行上行资源调度。
中射频单元 1024用于将信道调制后的 OFDM信号进行上变频,利用天 线通过无线信道发送给 UE。 中射频单元 1024利用天线接收 UE的上行信 号, 下变频到基带信号, 并将基带信号传给信道估计单元 1025 , 信道解调 单元 1026和随机接入前导检测单元 1028。
信道估计单元 1025 用于从上行链路的导频信道估计无线传输路径特 性, 并将信道估计结果送给信道解调单元 1026。 为了准确进行上下行资源 调度, 还将信道估计结果送给调度单元 1023。
信道解调单元 1026用于根据信道估计单元 1025的信道估计结果, 将 中射频单元 1024送来的接收信号进行解调。 信道分离单元 1027将信道解 调单元 1026处理后的信号分离为用户数据和控制数据。 将分离后的控制数 据中的下行链路的 CQI信息传到调度单元 1023 , 将其他控制数据和用户数 据传到高层。 接口单元 1033 , 包含基站间的 X2接口, 用于基站间的信息交互; 基 站与核心网的 S1接口, 用于基站与核心网的信息交互; 当集中控制器处于 基站外时, 还包含基站与集中控制器之间的接口, 用于基站与集中控制器 间的信息交互。
资源映射单元 1021用于根据调度单元 1023的调度指示, 将从高层输 入的控制数据和用户数据映射到下行控制信道、 下行同步信道以及下行数 据共享信道。 信道调制单元 1022进行数据调制、 串 /并变换、 IFFT变换, 加 CP等处理, 并生成 OFDM信号。
图 13为本发明实施例提供的集中控制器一种装置示意图, 包括处理器 1301、存储器 1302以及接口 1303 ,处理器 1301和存储器 1302和接口 1303 通过总线连接。
接口 1303用于和基站 102进行信息交互。
存储器 1302用于存储程序代码, 处理器 1301调用存储器中存储的程 序代码, 用于执行实施例 2中集中控制器的方法。
图 14为本发明实施例提供的第一基站的一种装置示意图, 包括处理器 1401、存储器 1402、收发机 1403以及接口 1404,处理器 1401和存储器 1402 和收发机 1403以及接口 1404通过总线连接。
接口 1404用于基站间的信息交互或基站与核心网的信息交互。
收发机 1403用于和用户设备进行信息交互。
存储器 1402用于存储程序代码, 处理器 1401调用存储器 1402中存储 的程序代码, 执行实施例 2中第一基站的方法。
图 15为本发明实施例提供的第二基站的一种装置示意图, 包括处理器 1501、存储器 1502、收发机 1503以及接口 1504,处理器 1501和存储器 1502 和收发机 1503以及接口 1504通过总线连接。
接口 1504用于基站间的信息交互或基站与核心网的信息交互。
收发机 1503用于和用户设备进行信息交互。 存储器 1502用于存储程序代码, 处理器 1501调用存储器 1502中存储 的程序代码, 执行实施例 2中第二基站的方法。
本实施例中, 如果利用基站间切换的用户设备的非竟争随机接入过程, 通过信令交互获取基站间的第一类型时间差不能满足系统要求, 则利用用 户设备的主动随机接入进一步获取基站间的第二类型时间差。 根据获取的 时间差以及基准基站的基准时间获取非基准基站的时间调整量, 以便非基 准基站根据时间调整量进行时间调整, 实现非基准基站与基准基站的时间 同步。 该空口同步方式不需要采用昂贵的同步设备, 降低了建设和维护成 本, 达到经济、 方便的技术效果。
实施例 8
图 12是本发明实施例提供的基站另一种结构示意图, 其中, 第二基站 包含实施例 7 中集中控制器的功能。 当基准基站为第二基站时, 非基准基 站为第一基站; 或者, 当基准基站为第一基站时, 非基准基站为第二基站。 第一基站与实施例 Ί 中基本一致, 不同的是, 在该实施例中, 第一基站的 时间差发送单元 1036将时间差计算单元 1031得到的时间差发送给第二基 站。
该实施例中, 第一基站还包括调整量获取单元 1034 和时间调整单元 1035。
调整量获取单元 1034, 用于当所述基准基站为所述第二基站时, 获取 第二基站发送的所述时间调整量。
时间调整单元 1035 ,用于根据所述调整量获取单元 1034获取的所述时 间调整量进行时间调整。
第二基站包含实施例 Ί 中的集中控制器功能, 因此, 第二基站包括: 第一类型时间差获取单元 1014、时间调整量处理单元 1011和调整量发送单 元 1012。
第一类型时间差获取单元 1014, 用于获取至少一个第一类型时间差, 至少一个第一类型时间差包含第一时间差, 第一时间差为根据第一基站和 第二基站间切换的第一 UE的非竟争随机接入获取的时间差;
时间调整量处理单元 1011 , 根据至少一个第一类型时间差和基准基站 的基准时间, 获取非基准基站的时间调整量。
调整量发送单元 1012,用于将所述时间调整量处理单元 1011获取的时 间调整量发送给非基准基站, 以便非基准基站根据时间调整量进行时间调 整。
可选的, 时间调整量处理单元 1011 , 还用于, 当所述至少一个第一类 型时间差准确时, 根据所述至少一个第一类型时间差和所述基准基站的基 准时间, 获取所述非基准基站的时间调整量。
当至少一个第一类型时间差不准确, 第二基站还包括:
第二类型时间差获取单元 1015 , 用于获取至少一个第二类型时间差, 至少一个第二类型时间差包含第二时间差,第二时间差为利用第二 UE的主 动随机接入获取的时间差 .
可选的, 第二基站还包括时间差请求单元 1013 , 用于向第一基站发送 时间差请求消息, 以便第一基站获取所述第二时间差并将第二时间差发送 给第二类型时间差获取单元 1015。
可选的, 时间调整量处理单元 1011 , 还用于当已获取的时间差准确时, 根据已获取的时间差和基准基站的基准时间, 获取非基准基站的时间调整 量, 已获取的时间差包括第一类型时间差获取单元 1014获取的至少一个第 一类型时间差和第二类型时间差获取单元 1015获取的至少一个第二类型时 间差。
图 16为本发明实施例提供的第一基站的另一种装置示意图, 包括处理 器 1601、 存储器 1602、 收发机 1603以及接口 1604, 处理器 1601和存储器 1602和收发机 1603以及接口 1604通过总线连接。
接口 1604用于基站间的信息交互或基站与核心网的信息交互。 收发机 1603用于和用户设备进行信息交互。
存储器 1602用于存储程序代码, 处理器 1601调用存储器 1602中存储 的程序代码, 用于执行实施例 6中第一基站的方法。
图 17为本发明实施例提供的第二基站的另一种装置示意图, 包括处理 器 1701、 存储器 1702、 收发机 1703以及接口 1704, 处理器 1701和存储器 1702和收发机 1703以及接口 1704通过总线连接。
接口 1704用于基站间的信息交互或基站与核心网的信息交互。
收发机 1703用于和用户设备进行信息交互。
存储器 1702用于存储程序代码, 处理器 1701调用存储器 1702中存储 的程序代码, 用于执行实施例 6中第二基站的方法。
本实施例中, 如果利用基站间切换的用户设备的非竟争随机接入过程, 通过信令交互获取基站间的第一类型时间差不能满足系统要求, 则利用用 户设备的主动随机接入进一步获取基站间的第二类型时间差。 根据获取的 时间差以及基准基站的基准时间获取非基准基站的时间调整量, 以便非基 准基站根据时间调整量进行时间调整, 实现非基准基站与基准基站的时间 同步。 该空口同步方式不需要采用昂贵的同步设备, 降低了建设和维护成 本, 达到经济、 方便的技术效果。
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 贅述。
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采用硬件的形式实现, 也可以采用软 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
1. 一种集中控制器装置, 其特征在于, 包括:
第一类型时间差获取单元, 用于获取至少一个第一类型时间差, 所述 至少一个第一类型时间差包含第一时间差, 所述第一时间差为根据第一基 站和第二基站间切换的第一 UE的非竟争随机接入获取的时间差;
时间调整量处理单元, 用于根据所述至少一个第一类型时间差和第一 基站的基准时间, 获取第二基站的时间调整量, 其中, 第一基站是基准基 站, 第二基站是非基准基站;
调整量发送单元, 用于将所述时间调整量处理单元获取的所述时间调 整量发送给所述第二基站, 以便所述第二基站根据所述时间调整量进行时 间调整。
2. 根据权利要求 1所述的集中控制器装置, 其特征在于, 所述时间调 整量处理单元, 用于根据所述至少一个第一类型时间差和第一基站的基准 时间, 获取第二基站的时间调整量, 包括:
用于当所述至少一个第一类型时间差准确时, 根据所述至少一个第一 类型时间差和所述第一基站的基准时间, 获取所述第二基站的时间调整量。
3. 根据权利要求 1或 2任意一项所述的集中控制器装置,其特征在于, 还包括:
第二类型时间差获取单元, 用于当所述时间调整量处理单元判断所述 至少一个第一类型时间差不准确时, 获取至少一个第二类型时间差, 所述 至少一个第二类型时间差包含第二时间差, 所述第二时间差为利用第二 UE 的主动随机接入获取的时间差;
所述时间调整量处理单元, 用于根据所述至少一个第一类型时间差和 第一基站的基准时间, 获取第二基站的时间调整量, 包括:
用于当已获取的时间差准确时, 根据所述已获取的时间差和第一基站 的基准时间, 获取所述第二基站的时间调整量, 所述已获取的时间差包括 所述第一类型时间差获取单元获取的至少一个第一类型时间差和所述第二 类型时间差获取单元获取的所述至少一个第二类型时间差。
4. 根据权利要求 3所述的集中控制器装置, 其特征在于, 还包括: 时间差请求单元, 用于向所述第一基站发送时间差请求消息。
5. 根据权利要求 4所述的集中控制器装置, 其特征在于, 所述时间差 请求单元, 用于向所述第一基站发送时间差请求消息, 包括:
用于定时向所述第一基站发送所述时间差请求消息; 或者,
用于根据所述第一基站负载情况, 当所述第一基站负载低于负载门限 时, 向所述第一基站发送所述时间差请求消息。
6. 根据权利要求 2所述的集中控制器装置, 其特征在于, 所述至少一 个第一类型时间差通过以下任意一种条件确定是准确的:
用于统计所述至少一个第一类型时间差的数量, 如果所述数量超过数 量门限, 则所述至少一个第一类型时间差准确; 或者,
用于统计所述至少一个第一类型时间差的方差, 如果所述方差小于方 差门限, 则所述至少一个第一类型时间差准确; 或者,
用于比较所述至少一个第一类型时间差中的任意两个时间差之间的差 值, 如果最小的差值小于最小差值门限, 则所述至少一个第一类型时间差 准确。
7. 一种空口同步的方法, 其特征在于, 包括:
集中控制器获取至少一个第一类型时间差, 所述至少一个第一类型时 间差包含第一时间差, 所述第一时间差为根据第一基站和第二基站间切换 的第一 UE的非竟争随机接入获取的时间差;
所述集中控制器根据所述至少一个第一类型时间差和第一基站的基准 时间, 获取第二基站的时间调整量, 其中, 第一基站是基准基站, 第二基 站是非基准基站; 集中控制器将所述时间调整量发送给所述第二基站, 以便所述第二基 站根据所述时间调整量进行时间调整。
8. 根据权利要求 7所述的空口同步方法, 其特征在于, 所述集中控制 器根据所述至少一个第一类型时间差和第一基站的基准时间, 获取第二基 站的时间调整量, 包括:
当所述至少一个第一类型时间差准确时, 所述集中控制器根据所述至 少一个第一类型时间差和所述第一基站的基准时间, 获取所述第二基站的 时间调整量。
9. 根据权利要求 8所述的空口同步方法, 其特征在于, 还包括: 当所述至少一个第一类型时间差不准确时, 所述集中控制器获取至少 一个第二类型时间差, 所述至少一个第二类型时间差包含第二时间差, 所 述第二时间差为利用第二 UE的主动随机接入获取的时间差;
当已获取的时间差准确时, 根据所述已获取的时间差和第一基站的基 准时间, 获取所述第二基站的时间调整量, 所述已获取的时间差包括所述 至少一个第一类型时间差和所述至少一个第二类型时间差。
10. 根据权利要求 9所述的空口同步的方法, 其特征在于, 所述集中控 制器获取至少一个第二类型时间差, 所述至少一个第二类型时间差包含第 二时间差, 还包括:
集中控制器向所述第一基站发送时间差请求消息。
11. 根据权利要求 10所述的空口同步的方法, 其特征在于, 所述向第 一基站发送时间差请求消息, 包括:
定时向所述第一基站发送所述时间差请求消息; 或者,
根据所述第一基站负载情况, 当所述第一基站负载低于负载门限时, 向所述第一基站发送所述时间差请求消息。
12. 根据权利要求 8所述的空口同步的方法, 其特征在于, 所述至少一 个第一类型时间差通过以下任意一种条件确定是准确的: 统计所述至少一个第一类型时间差的数量, 如果所述数量超过数量门 限, 则所述至少一个第一类型时间差准确; 或者,
统计所述至少一个第一类型时间差的方差, 如果所述方差小于方差门 限, 则所述至少一个第一类型时间差准确; 或者,
比较所述至少一个第一类型时间差中的任意两个时间差之间的差值, 如果最小的差值小于最小差值门限, 则所述至少一个第一类型时间差准确。
13. 一种基站, 用作第二基站, 其特征在于, 包括:
第一类型时间差获取单元, 用于获取至少一个第一类型时间差, 所述 至少一个第一类型时间差包含第一时间差, 所述第一时间差为根据第一基 站和第二基站间切换的第一 UE的非竟争随机接入获取的时间差;
时间调整量处理单元, 用于根据所述至少一个第一类型时间差和基准 基站的基准时间, 获取非基准基站的时间调整量, 其中, 所述基准基站为 所述第二基站, 所述非基准基站为所述第一基站, 或者, 所述基准基站为 所述第一基站, 所述非基准基站为所述第二基站;
调整量发送单元, 用于将所述时间调整量处理单元获取的所述时间调 整量发送给所述非基准基站, 以便所述非基准基站根据所述时间调整量进 行时间调整。
14. 根据权利要求 13所述的基站, 其特征在于, 所述时间调整量处理 单元, 用于根据所述至少一个第一类型时间差和基准基站的基准时间, 获 取非基准基站的时间调整量, 包括:
用于当所述至少一个第一类型时间差准确时, 根据所述至少一个第一 类型时间差和所述基准基站的基准时间, 获取所述非基准基站的时间调整 量。
15. 根据权利要求 12或 13任意一项所述的基站,其特征在于,还包括: 第二类型时间差获取单元, 用于当所述时间调整量处理单元判断所述 至少一个第一类型时间差不准确时, 获取至少一个第二类型时间差, 所述 至少一个第二类型时间差包含第二时间差, 所述第二时间差为利用第二 UE 的主动随机接入获取的时间差;
所述时间调整量处理单元, 用于根据所述至少一个第一类型时间差和 基准基站的基准时间, 获取非基准基站的时间调整量, 包括:
用于当已获取的时间差准确时, 根据所述已获取的时间差和基准基站 的基准时间, 获取所述非基准基站的时间调整量, 所述已获取的时间差包 括所述第一类型时间差获取单元获取的所述至少一个第一类型时间差和所 述第二类型时间差获取单元获取的所述至少一个第二类型时间差。
16. 根据权利要求 15所述的基站, 其特征在于, 还包括:
时间差请求单元, 用于向所述第一基站发送时间差请求消息。
17. 根据权利要求 16所述的基站, 其特征在于, 所述时间差请求单元, 用于向所述第一基站发送时间差请求消息, 包括:
用于定时向所述第一基站发送所述时间差请求消息; 或者,
用于根据所述第一基站负载情况, 当所述第一基站负载低于负载门限 时, 向所述第一基站发送所述时间差请求消息。
18. 根据权利要求 14所述的基站, 其特征在于, 所述至少一个第一类 型时间差通过以下任意一种条件确定是准确的:
用于统计所述至少一个第一类型时间差的数量, 如果所述数量超过数 量门限, 则所述至少一个第一类型时间差准确; 或者,
用于统计所述至少一个第一类型时间差的方差, 如果所述方差小于方 差门限, 则所述至少一个第一类型时间差准确; 或者,
用于比较所述至少一个第一类型时间差中的任意两个时间差之间的差 值, 如果最小的差值小于最小差值门限, 则所述至少一个第一类型时间差 准确。
19. 一种空口同步的方法, 其特征在于, 包括:
第二基站获取至少一个第一类型时间差, 所述至少一个第一类型时间 差包含第一时间差, 所述第一时间差为根据第一基站和所述第二基站间切 换的第一 UE的非竟争随机接入获取的时间差;
所述第二基站根据所述至少一个第一类型时间差和基准基站的基准时 间, 获取非基准基站的时间调整量, 其中, 所述基准基站为所述第二基站, 所述非基准基站为所述第一基站, 或者, 所述基准基站为所述第一基站, 所述非基准基站为所述第二基站;
所述第二基站将所述时间调整量发送给所述非基准基站, 以便所述非 基准基站根据所述时间调整量进行时间调整。
20. 根据权利要求 19所述的空口同步方法, 其特征在于, 所述第二基 站根据所述至少一个第一类型时间差和基准基站的基准时间 , 获取非基准 基站的时间调整量, 包括:
当所述至少一个第一类型时间差准确时, 所述第二基站根据所述至少 一个第一类型时间差和基准基站的基准时间, 获取非基准基站的时间调整 量。
21. 根据权利要求 20所述的空口同步方法, 其特征在于, 还包括: 当所述至少一个第一类型时间差不准确时, 所述第二基站获取至少一 个第二类型时间差, 所述至少一个第二类型时间差包含第二时间差, 所述 第二时间差为利用第二 UE的主动随机接入获取的时间差;
当已获取的时间差准确时, 根据所述已获取的时间差和所述基准基站 的基准时间, 获取所述非基准基站的时间调整量, 所述已获取的时间差包 括所述至少一个第一类型时间差和所述至少一个第二类型时间差。
22. 根据权利要求 21所述的空口同步的方法, 其特征在于, 所述第二 基站获取至少一个第二类型时间差, 所述至少一个第二类型时间差包含第 二时间差, 还包括:
所述第二基站向所述第一基站发送时间差请求消息。
23. 根据权利要求 22所述的空口同步的方法, 其特征在于, 所述向第 一基站发送时间差请求消息, 包括:
定时向所述第一基站发送所述时间差请求消息; 或者,
根据所述第一基站负载情况, 当所述第一基站负载低于负载门限时, 向所述第一基站发送所述时间差请求消息。
24. 根据权利要求 20所述的空口同步的方法, 其特征在于, 所述至少 一个第一类型时间差通过以下任意一种条件确定是准确的:
统计所述至少一个第一类型时间差的数量, 如果所述数量超过数量门 限, 则所述至少一个第一类型时间差准确; 或者,
统计所述至少一个第一类型时间差的方差, 如果所述方差小于方差门 限, 则所述至少一个第一类型时间差准确; 或者,
比较所述至少一个第一类型时间差中的任意两个时间差之间的差值, 如果最小的差值小于最小差值门限, 则所述至少一个第一类型时间差准确。
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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3316630A4 (en) * 2015-08-07 2018-07-18 Huawei Technologies Co., Ltd. Time synchronization method, device and system
EP3410790A4 (en) * 2016-02-29 2019-05-29 Huawei Technologies Co., Ltd. METHOD, DEVICE, AND SYSTEM FOR TIME SYNCHRONIZATION

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2020029310A1 (zh) 2018-08-09 2020-02-13 Oppo广东移动通信有限公司 一种数据传输方法及装置、终端
BR112017021433A2 (pt) * 2015-04-07 2018-07-03 Qualcomm Inc ajuste de valores de antecipação de temporização em dispositivos móveis
WO2016192058A1 (zh) * 2015-06-03 2016-12-08 华为技术有限公司 一种空中接口同步的方法、装置及系统
CN107925972A (zh) * 2015-08-14 2018-04-17 华为技术有限公司 一种站间同步方法、基站及控制网元
CN108713334B (zh) * 2016-03-15 2021-02-23 华为技术有限公司 一种基站间的同步方法、设备

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20060193306A1 (en) * 2005-01-31 2006-08-31 Kinichi Higure System and method for synchronization between base stations
CN1905405A (zh) * 2005-07-26 2007-01-31 中兴通讯股份有限公司 一种空中接口同步方法
CN101448314A (zh) * 2008-12-18 2009-06-03 华为技术有限公司 实现基站间时间同步的方法和系统及通信终端
CN102547961A (zh) * 2010-12-10 2012-07-04 华为技术有限公司 基站间同步的方法、装置及系统

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5872774A (en) * 1997-09-19 1999-02-16 Qualcomm Incorporated Mobile station assisted timing synchronization in a CDMA communication system
CN101064561B (zh) * 2006-04-29 2011-08-10 华为技术有限公司 小区间切换过程中实现上行同步的方法
CN101035327A (zh) * 2007-04-13 2007-09-12 华为技术有限公司 无线通信系统、空中接口同步方法、基站及其控制器
CN103024890B (zh) * 2011-09-20 2017-02-08 中兴通讯股份有限公司 辅小区的上行同步方法、基站和终端

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20060193306A1 (en) * 2005-01-31 2006-08-31 Kinichi Higure System and method for synchronization between base stations
CN1905405A (zh) * 2005-07-26 2007-01-31 中兴通讯股份有限公司 一种空中接口同步方法
CN101448314A (zh) * 2008-12-18 2009-06-03 华为技术有限公司 实现基站间时间同步的方法和系统及通信终端
CN102547961A (zh) * 2010-12-10 2012-07-04 华为技术有限公司 基站间同步的方法、装置及系统

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3316630A4 (en) * 2015-08-07 2018-07-18 Huawei Technologies Co., Ltd. Time synchronization method, device and system
US10631209B2 (en) 2015-08-07 2020-04-21 Huawei Technologies Co., Ltd. Time synchronization method, device, and system
EP3410790A4 (en) * 2016-02-29 2019-05-29 Huawei Technologies Co., Ltd. METHOD, DEVICE, AND SYSTEM FOR TIME SYNCHRONIZATION

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