WO2016183945A1 - 寻呼方法、用户设备、基站及核心网设备 - Google Patents

寻呼方法、用户设备、基站及核心网设备 Download PDF

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Publication number
WO2016183945A1
WO2016183945A1 PCT/CN2015/086071 CN2015086071W WO2016183945A1 WO 2016183945 A1 WO2016183945 A1 WO 2016183945A1 CN 2015086071 W CN2015086071 W CN 2015086071W WO 2016183945 A1 WO2016183945 A1 WO 2016183945A1
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Prior art keywords
base station
core network
network device
time
paging
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PCT/CN2015/086071
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English (en)
French (fr)
Inventor
于峰
于映辉
刘蕾
周涵
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华为技术有限公司
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Publication date
Application filed by 华为技术有限公司 filed Critical 华为技术有限公司
Priority to JP2017560312A priority Critical patent/JP6546291B2/ja
Priority to BR112017024778-0A priority patent/BR112017024778B1/pt
Priority to EP15892323.5A priority patent/EP3291616B1/en
Priority to KR1020177035663A priority patent/KR102038347B1/ko
Priority to CN201580001031.1A priority patent/CN106416391B/zh
Publication of WO2016183945A1 publication Critical patent/WO2016183945A1/zh
Priority to US15/816,969 priority patent/US10341973B2/en

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W56/00—Synchronisation arrangements
    • H04W56/001—Synchronization between nodes
    • H04W56/0015—Synchronization between nodes one node acting as a reference for the others
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/70—Services for machine-to-machine communication [M2M] or machine type communication [MTC]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/02—Power saving arrangements
    • H04W52/0209—Power saving arrangements in terminal devices
    • H04W52/0212—Power saving arrangements in terminal devices managed by the network, e.g. network or access point is master and terminal is slave
    • H04W52/0216—Power saving arrangements in terminal devices managed by the network, e.g. network or access point is master and terminal is slave using a pre-established activity schedule, e.g. traffic indication frame
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/02—Power saving arrangements
    • H04W52/0209—Power saving arrangements in terminal devices
    • H04W52/0212—Power saving arrangements in terminal devices managed by the network, e.g. network or access point is master and terminal is slave
    • H04W52/0219—Power saving arrangements in terminal devices managed by the network, e.g. network or access point is master and terminal is slave where the power saving management affects multiple terminals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W56/00—Synchronisation arrangements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W68/00—User notification, e.g. alerting and paging, for incoming communication, change of service or the like
    • H04W68/005—Transmission of information for alerting of incoming communication
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W68/00—User notification, e.g. alerting and paging, for incoming communication, change of service or the like
    • H04W68/02—Arrangements for increasing efficiency of notification or paging channel
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/20—Manipulation of established connections
    • H04W76/28—Discontinuous transmission [DTX]; Discontinuous reception [DRX]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/08—Access point devices
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

Definitions

  • the present invention relates to the field of communications technologies, and in particular, to a paging method, a user equipment, a base station, and a core network device.
  • Machine and machine is the abbreviation of the transmission of information and data between machines and machines through wireless networks. It is an important direction for the development of mobile communication. It is widely used in many fields, including intelligent transportation, building control systems, home intelligent control systems, video surveillance systems, industrial monitoring and so on.
  • the core network device when the downlink data needs to be sent to the user equipment (UE, User Equipment), the core network device starts the paging timer and sends the bearer identification (ID) to all the base stations in the paging area.
  • ID bearer identification
  • a paging message when receiving the paging message, the base station in the paging area calculates the latest paging occasion of the UE corresponding to the UE identifier on the air interface according to the UE identifier carried in the paging message (PO, Paing occasion) And, when the PO arrives, the paging message is sent to the UE corresponding to the UE identifier.
  • the UE corresponding to the UE identity After receiving the paging message, the UE corresponding to the UE identity initiates a random access procedure, and establishes a connection with the base station and the core network. After the UE accesses the network, the core network sends downlink data to the UE.
  • the paging superframe (PSF, Paging Super frame) PF and PO determine the paging moment.
  • an extended discontinuous reception (eDRX) mechanism is introduced in the M2M system, and the UE adopts the eDRX mode for monitoring the paging channel in the idle state. That is, the UE only listens to the paging channel when the paging moment of each eDRX activation period arrives, enters a sleep state if no paging message is detected, and wakes up to listen to the paging channel when the next paging moment arrives. , thereby reducing the power consumption of the UE. Specifically, the UE maintains a UE-specific eDRX cycle, and the UE sends the eDRX cycle through NAS messages or other methods.
  • eDRX extended discontinuous reception
  • the core network device carries the information such as the eDRX period and the UE identifier in the paging message to the base station when the paging message is sent, and the base station calculates the paging superframe (PSF, Paging Super frame) of the UE according to the information.
  • PSF paging superframe
  • the paging message is sent at the paging moment indicated by the PSF and the PO; the UE calculates the PSF and the PO according to information such as its own eDRX period and the UE identity, and receives the paging message at the paging moment indicated by the PSF and the PO.
  • the PSF and PO calculated by the UE should be the same as the PSF and PO calculated by each base station.
  • the PSF is a superframe in which a PO exists
  • the PO is a frame in which a paging message exists in a paging superframe.
  • the current paging method has the following problem: considering the mobility of the UE, if the UE moves between different cells in the idle state, the UE may perform cell reselection before the paging moment of the current cell arrives. Reselecting to another new cell, and when the reselection is completed, the paging moment of the new cell has passed, so that the UE misses the paging moment of the current cell, and also misses the paging moment of the new cell, and the UE performs the cell weight. After the selection, the paging time of the next eDRX cycle can only be received before the paging message can be received.
  • the UE may have to wait for the time of one eDRX cycle to wait until the next paging moment, due to the waiting time. Long, the UE is likely to re-select the cell during this time, so that the paging moment of the current cell is about to be missed again. After re-selecting to the new cell, it may just miss the paging moment of the new cell, and so on, if the UE Moving all the time, cell reselection may occur continuously during the waiting time, so that the UE can not wait for the paging moment and cannot receive the paging message.
  • a paging method a UE, a base station, and a core network device are provided, which can reduce the occurrence of the problem that the UE cannot listen to the paging message.
  • an embodiment of the present invention provides a paging method, including:
  • the core network device determines the reference frame information, where the reference frame information includes: a radio frame number;
  • the core network device sends the reference frame information to a base station in a paging area, so that the base station synchronizes radio frames in the base station according to the reference frame information.
  • the determining, by the core network device, the synchronization timing includes:
  • the core network device determines that a new base station is connected to the core network device in the paging area; or
  • the core network device determines a synchronization moment to reach each synchronization period; or,
  • the core network device receives a synchronization request message sent by at least one of the paging areas.
  • the determining, by the core network device, the reference frame information includes:
  • the core network device pre-stores the initial radio frame number
  • the core network device calculates an absolute time offset between the current time and the initial time, where the initial time is an initial time of the wireless frame indicated by the wireless frame number;
  • the core network device determines the absolute time offset and the initial radio frame number as reference frame information.
  • the determining, by the core network device, the reference frame information includes:
  • the core network device pre-stores an initial radio frame number
  • the core network device continuously updates the stored radio frame number to a frame number of a current radio frame of the core network device according to a duration of the radio frame;
  • the core network device reads a radio frame number stored by the core network device.
  • the reference frame information further includes: a subframe number; the core network device determines Baseline frame information, including:
  • the core network device pre-stores an initial radio frame number and a subframe number
  • the core network device continuously updates the stored radio frame number to the frame number of the current radio frame according to the duration of the system paging frame and the subframe, and updates the stored subframe number to the current subframe in the current radio frame.
  • Subframe number
  • the core network device reads a radio frame number and a subframe number stored by the core network device.
  • the determining, by the core network device, the reference frame information includes:
  • the frame information includes: a radio frame number of the first base station when the first base station sends the frame information; and the first base station is a base station in a paging area.
  • the core network device determines the reference frame information, including:
  • the frame information includes: a radio frame number and a subframe number of the first base station when the first base station sends the frame information; and the first base station is a base station in a paging area.
  • the core network device determines the reference frame information, and further include:
  • the core network device Before receiving the frame information of the first base station, the core network device sends a frame information request to the first base station.
  • the method further includes:
  • the core network device receives a receiving confirmation message sent by the base station after receiving the frame information.
  • the core network device receives an eDRX cycle of the UE that is sent by the UE in a connected state, and calculates a PF and a PO of the UE according to the eDRX cycle;
  • the core network device When the downlink data of the UE arrives and the UE is in an idle state, the core network device sends a paging message to the base station before the paging moment indicated by the PF and the PO, so that the base station sends the paging A message is sent to the UE.
  • the moment when the core network device sends a paging message to the base station, and the time at which the PF and the PO are calculated The paging moments are closer to the paging moment.
  • the core network device When the downlink data of the UE arrives and the UE is in an idle state, the core network device sends a paging message to the base station, where the paging message includes an eDRX period of the UE;
  • the core network device receives a first time interval sent by the base station, where the first time interval calculates, according to the eDRX period, the PF and PO of the UE, and determines a PF and PO indication of the UE.
  • the paging time is sent when the time interval of the current time is greater than the preset time threshold; the first time interval is less than or equal to the time interval of the paging time of the UE from the current time;
  • the core network device sends a paging message to the base station according to the received first time interval.
  • the core network device sends a paging message to the base station according to the received first time interval ,include:
  • the core network device For each base station, the core network device sends a paging message to the base station after the first time interval of the base station according to the first time interval sent by the base station; or
  • the core network device selects a minimum first time interval from a first time interval sent by each base station, and sends a paging message to each base station after the minimum first time interval.
  • the sending, by the core network device, a paging message to the base station includes:
  • the core network device determines that the paging message of the UE is not sent after the UE transits from the connected state to the idle state, and immediately sends the paging message to the base station; or
  • the sending, by the core network device, the paging message to the base station includes:
  • the core network device determines that the paging message of the UE is not sent after the UE transits from the connected state to the idle state, and immediately sends the paging message to the base station; or
  • the core network device determines that the UE sends the paging cancellation of the UE after transitioning from the connected state to the idle state. And determining, according to the pre-stored transmission reference time and the reference time interval, the eDRX period of the UE, the time of sending the paging message, and when the time when the paging message is sent arrives, the core network device sends the homing to the base station. Call the message.
  • the method further includes:
  • the core network device when receiving the paging message, receives the first time interval sent by the base station, and the core network device updates the sending reference time by using the sending time of the paging message, and uses the received The reference time interval is updated at a time interval.
  • the core network device determines that the paging message of the UE is not sent after the UE transitions from the connected state to the idle state
  • the core The network device immediately sends a paging message to the base station; or, when the downlink data of the UE arrives and the UE is in an idle state, and the core network device determines that the UE transits from the connected state to the idle state,
  • the time interval of the core network device according to the last time the paging message of the UE is sent, the eDRX period of the UE, and the second time interval corresponding to the paging message of the last time the UE is sent Determining the time when the paging message is sent this time, when the time when the paging message is sent arrives, sending a paging message to the base station;
  • the second time interval corresponding to the paging message sent by the UE in the last time is: the second time interval carried in the paging response message that each base station corresponds to when the paging message of the UE is sent by the core network device last time;
  • the second time interval is used to indicate, to the core network device, a paging moment of the UE calculated by the base station.
  • the core network device according to a time when the paging message of the UE is last sent, the UE The eDRX period and the second time interval corresponding to the paging message of the last time the UE is sent to determine the time of sending the paging message, including:
  • the core network device selects a second time interval with a smallest value from the second time interval
  • the core network device determines the time when the paging message is sent according to the following formula:
  • the time when the paging message is sent this time the time of the last time the paging message of the UE is sent + M*eDRX period + the second time interval where the value is the smallest; M is a natural number.
  • an embodiment of the present invention provides a paging method, including:
  • the base station synchronizes radio frames in the base station according to the reference frame information.
  • the performing, by the base station, the radio frame in the base station according to the frame information includes:
  • the base station calculates, according to the absolute time offset and the length of one radio frame, the number of radio frames included in the absolute time offset and the remaining time offset;
  • the base station calculates, according to the remaining time offset and the subframe length, the number of subframes included in the remaining time offset
  • the base station adds the initial radio frame number to the number of radio frames, obtains the frame number of the current radio frame, and determines the subframe number of the current subframe in the current radio frame according to the number of subframes.
  • the performing, by the base station, the radio frame in the base station according to the frame information includes:
  • the base station updates the frame number of the current radio frame in the base station to the radio frame number carried in the reference frame information.
  • the frame information further includes: a subframe number; and the base station, according to the frame information, the radio frame in the base station, including:
  • the base station updates the frame number of the current radio frame in the base station to the radio frame number carried in the reference frame information, and updates the subframe number of the current radio frame in the base station to the reference frame information.
  • the method further includes:
  • the base station sends a reception confirmation message of the reference frame information to the core network device.
  • the method further includes:
  • the base station calculates the PF and PO of the UE according to the eDRX period and the UE identifier carried in the paging message;
  • the base station sends a paging message of the UE at a paging moment indicated by the PF and the PO of the UE.
  • the method further includes:
  • the base station calculates the PF and PO of the UE according to the eDRX period and the UE identifier carried in the paging message;
  • the base station Determining, by the base station, that the time interval between the paging time indicated by the PF and the PO is greater than the preset time threshold, determining the first time interval, and transmitting the determined first time interval to the core network device;
  • the first time interval is less than or equal to the time interval between the paging time and the current time;
  • the base station receives a paging message of the UE that is sent by the core network device according to the first time interval.
  • the method before the sending, by the base station, the determined first time interval to the core network device, the method further includes:
  • the base station obtains a list of recommended base stations from the received paging message, and determines that the base station itself is a base station listed in the recommended cell list.
  • the method further includes:
  • the base station calculates the PF and PO of the UE according to the eDRX period and the UE identifier carried in the paging message;
  • the second time interval is used to indicate to the core network device a paging moment indicated by the PF and the PO.
  • the method further includes:
  • the base station determines that the current time exceeds the preset period value
  • the synchronization request message is sent to the core network device, where the time is greater than the preset period value.
  • Current frame information
  • a paging method including:
  • the user equipment wakes up at a first moment before the paging moment indicated by the PF and the PO, and determines whether the user equipment performs cell reselection; a time interval between the first moment and the paging moment And greater than or equal to a time when the user equipment completes a cell reselection;
  • the paging message is monitored on the paging channel of the reselected cell;
  • the paging message is monitored on the paging channel of the current cell or enters a sleep state until the paging moment wakes up to listen to the paging message on the paging channel of the current cell.
  • a time interval between the first moment and the paging moment is greater than or equal to a time when the user equipment completes a cell reselection and a wireless The sum of the durations of the frames.
  • an embodiment of the present invention provides a core network device, including:
  • a processor configured to determine, when the synchronization opportunity comes, the core network device determines reference frame information, where the reference frame information includes: a radio frame number;
  • a transmitter configured to send, by the base station in the paging area, the reference frame information determined by the processor, so that the base station synchronizes the radio frame in the base station according to the reference frame information.
  • the processor is specifically configured to:
  • the processor is specifically configured to:
  • the absolute time offset and the initial radio frame number are determined as reference frame information.
  • the processor is specifically configured to:
  • Reading the wireless frame number stored by the core network device is
  • the frame information further includes: a subframe number; :
  • the method further includes:
  • a receiver configured to receive frame information of the first base station that is sent by the first base station, where the frame information includes: a radio frame number of the first base station when the first base station sends the frame information;
  • a base station is a base station in a paging area;
  • the processor is further configured to: determine frame information of the first base station as the reference frame information.
  • the method further includes:
  • a receiver configured to receive frame information of the first base station that is sent by the first base station, where the frame information includes: a radio frame number and a subframe number of the first base station when the first base station sends the frame information;
  • the first base station is a base station in a paging area;
  • the processor is further configured to: determine frame information of the first base station as the reference frame information.
  • the transmitter is further configured to: Receiver connection Before receiving the frame information of the first base station, sending a frame information request to the first base station.
  • a receiver configured to receive a receiving confirmation message sent by the base station after receiving the frame information.
  • a receiver configured to receive an eDRX cycle of the UE that is sent by the UE in a connected state
  • the processor is further configured to: calculate a PF and a PO of the UE according to the eDRX cycle;
  • the transmitter is further configured to: when the downlink data of the UE arrives and the UE is in an idle state, send a paging message to the base station before the paging moment indicated by the PF and the PO, so that the base station The paging message is sent to the UE.
  • the moment when the core network device sends a paging message to the base station, and the time at which the PF and the PO are calculated The paging moments are closer to the paging moment.
  • a receiver configured to receive an eDRX cycle of the UE that is sent by the UE in a connected state
  • a transmitter configured to send a paging message to the base station when the downlink data of the UE arrives, and the UE is in an idle state, where the paging message includes an eDRX period of the UE;
  • the receiver is further configured to: receive a first time interval sent by the base station, where the first time interval calculates, according to the eDRX period, the PF and PO of the UE, and determines a PF of the UE. And sending when the paging moment indicated by the PO is greater than the preset time threshold from the current time interval; The first time interval is less than or equal to a time interval of the paging moment of the UE from the current time;
  • the transmitter is further configured to: send a paging message to the base station according to the received first time interval.
  • the transmitter is specifically configured to, according to the first time interval sent by the base station, Sending a paging message to the base station after the first time interval of the base station;
  • a minimum first time interval is selected from the first time interval transmitted by each base station, and a paging message is sent to each base station after the minimum first time interval.
  • the transmitter is specifically configured to:
  • the transmitter is specifically configured to:
  • the core network device Determining that the paging message sent by the UE after the UE transitions from the connected state to the idle state, determining the time of sending the paging message according to the pre-stored transmission reference time and the reference time interval, and the eDRX period of the UE, When the time when the paging message is sent, the core network device sends the paging message to the base station.
  • the processor is further configured to:
  • the transmission reference time is updated using the transmission time of the paging message, and the reference time interval is updated using the received first time interval.
  • a receiver configured to receive an eDRX cycle of the UE that is sent by the UE in a connected state
  • the processor is further configured to: when the downlink data of the UE arrives and the UE is in an idle state, and after determining that the UE sends a paging message of the UE after transitioning from a connected state to an idle state, according to the The time when the paging message of the UE is sent the last time, the eDRX period of the UE, and the second time interval corresponding to the paging message of the last time the UE is sent to determine the time when the paging message is sent this time;
  • the transmitter is further configured to: when the downlink data of the UE arrives and the UE is in an idle state, and after determining that the UE does not send the paging message of the UE after transitioning from the connected state to the idle state, Instantly sending a paging message to the base station; or, when the downlink data of the UE arrives and the UE is in an idle state, and determining that the UE sends a paging message of the UE after transitioning from the connected state to the idle state Sending a paging message to the base station when the time when the paging message is sent arrives;
  • the second time interval corresponding to the paging message sent by the UE in the last time is: the second time interval carried in the paging response message that each base station corresponds to when the paging message of the UE is sent by the core network device last time;
  • the second time interval is used to indicate, to the core network device, a paging moment of the UE calculated by the base station.
  • the processor is specifically configured to: select a second time with a minimum value from the second time interval interval;
  • the time when the paging message is sent this time the time of the last time the paging message of the UE is sent + M*eDRX period + the second time interval where the value is the smallest; M is a natural number.
  • an embodiment of the present invention provides a base station, including:
  • a receiver configured to receive reference frame information sent by the core network device, where the reference frame information includes: a radio frame number;
  • a processor configured to synchronize a radio frame in the base station according to the reference frame information received by the receiver.
  • the processor is specifically configured to:
  • the initial radio frame number is added to the number of radio frames to obtain the frame number of the current radio frame, and the subframe number of the current subframe in the current radio frame is determined according to the number of subframes.
  • the processor is specifically configured to:
  • the frame information further includes: a subframe number; the processor is specifically configured to:
  • the base station further includes:
  • a transmitter configured to send a receiving confirmation message of the reference frame information to the core network device.
  • the base station further includes:
  • the receiver is further configured to: receive a paging message sent by the core network device;
  • the processor is further configured to: calculate a PF and a PO of the UE according to the eDRX period and the UE identifier carried in the paging message;
  • the transmitter is further configured to: send a paging message of the UE at a paging moment indicated by the PF and the PO of the UE.
  • the base station further includes:
  • the receiver is further configured to: receive a paging message sent by the core network device;
  • the processor is further configured to: calculate a PF and a PO of the UE according to the eDRX period and the UE identifier carried in the paging message; and determine that the paging interval indicated by the PF and the PO is greater than a preset time by a preset time Determining a first time interval when the threshold is reached;
  • the transmitter is further configured to: send the determined first time interval to the core network device; the first time interval is less than or equal to a time interval of the paging time from the current time;
  • the receiver is further configured to: receive a paging message of the UE that is sent by the core network device according to the first time interval.
  • the processor is further configured to:
  • the method further includes:
  • the receiver is further configured to: receive a paging message sent by the core network device;
  • the processor is further configured to: calculate a PF and a PO of the UE according to the eDRX period and the UE identifier carried in the paging message; and determine a second time according to a time interval of the paging time indicated by the PF and the PO from the current time interval;
  • the method further includes: a transmitter, configured to send the second time interval in a paging response message to the core network device; and the second time interval is used to indicate the PF and the PO to the core network device Indicated paging moment.
  • the transmitter is further configured to: determine, by the processor, that the current time distance is received last time When the time of the reference frame information exceeds the preset period value, the synchronization request message is sent to the core network device, where the synchronization request message is used to request the core network device to send the current frame information.
  • an embodiment of the present invention provides a user equipment, including:
  • a processor configured to calculate a PF and a PO of the user equipment when entering an idle state; waking up at a first moment before a paging moment indicated by the PF and the PO, determining whether the user equipment performs cell reselection; The time interval between the first moment and the paging moment is greater than or equal to a time when the user equipment completes a cell reselection; if cell reselection is performed, cell reselection is completed;
  • a receiver configured to: when the processor determines to perform cell reselection, to listen to a paging message on a paging channel of the reselected cell; when the processor determines not to perform cell reselection, on a paging channel of a current cell Listening to the paging message or going to sleep until the paging moment wakes up to listen to the paging message on the paging channel of the current cell.
  • a time interval between the first moment and the paging moment is greater than or equal to a time when the user equipment completes a cell reselection and a wireless The sum of the durations of the frames.
  • the core network device determines the reference frame information, where the reference frame information includes: a radio frame number, and sends the reference frame information to the base station in the paging area,
  • the base station synchronizes the radio frame in the base station according to the reference frame information, so that at least the radio frame number is synchronized between the core network device and the base station, and the time difference between the core network device and the base station is limited to the duration of the radio frame. Therefore, the time error between cells of different base stations is minimized, so that the problem that the UE misses the paging moment of the new cell although completing the cell reselection before the paging moment of the current cell can be reduced to some extent.
  • FIG. 1 is an example of an application scenario of an embodiment of the present invention
  • FIG. 2 is a schematic flowchart of a paging method according to an embodiment of the present invention.
  • FIG. 3 is another schematic flowchart of a paging method according to an embodiment of the present invention.
  • FIG. 4 is another schematic flowchart of a paging method according to an embodiment of the present invention.
  • FIG. 5 is a schematic flowchart of another paging method according to an embodiment of the present invention.
  • FIG. 6 is another schematic flowchart of a paging method according to an embodiment of the present invention.
  • FIG. 7 is another schematic flowchart of a paging method according to an embodiment of the present invention.
  • FIG. 8 is a schematic structural diagram of a core network device according to an embodiment of the present invention.
  • FIG. 9 is a schematic structural diagram of a base station according to an embodiment of the present invention.
  • FIG. 10 is a schematic structural diagram of a user equipment according to an embodiment of the present invention.
  • the inventor has found that one of the reasons for causing the cell reselection of the UE to miss the paging moments of the two cells before and after the reselection is that the time between the base stations is not synchronized, so that although the PSF and PO of the same UE calculated by different base stations are the same, However, since the time between the base stations is not synchronized, the paging times indicated by the same PSF and PO may have different absolute times at different base stations. For example, if PSF1 and PO1 of UE1 indicate paging time 1, UE1 is currently located. The cell a of the base station A is reselected to the cell b of the base station B.
  • the paging time 1 of the UE1 in the cell of the base station A arrives at the absolute time t1
  • the paging time 1 of the UE1 in the cell of the base station B arrives at the absolute time t2. If t2 ⁇ t1, even if the UE starts cell reselection to cell b before the paging time 1 of cell a arrives, and the time when the UE completes the reselection is earlier than t1, as long as the time is later than t2, the UE The paging moment 1 of the cell b is missed, so that the UE1 needs to wait for the paging moment of the cell b in the next eDRX cycle, and if the UE1 moves frequently and repeats the above situation, the UE1 will not be able to listen to the paging message for a long time.
  • the core network can not receive hope issued data.
  • the embodiment of the present invention provides a paging method to reduce the occurrence of the problem that the UE cannot listen to the paging message in the above situation.
  • FIG. 1 is a schematic diagram of a network structure applied to a paging method according to an embodiment of the present invention. These include: a core network device 110, a base station 120, a cell 130 included in each base station 120, and a UE 140. The UE 140 is in one of the cells 130, and the UE 140 has certain mobility and can be moved to other cells.
  • the radio frame in the embodiment of the present invention is a superframe in the M2M
  • the subframe is a superframe frame
  • the core network device may be a serving GPRS support node) SGSN, Service GPRS Support Node
  • the radio frame in the embodiment of the present invention is a frame in LTE
  • the subframe is a subframe in LTE
  • the core network device may be Mobility Management Entity (MME).
  • MME Mobility Management Entity
  • a radio frame in which a PO is present such as a paging superframe in the M2M and a paging frame in the LTE, is called a paging radio frame (PF, Paging Frame), and the PF is a radio frame in which PO is present, and the PO is wireless.
  • PF paging radio frame
  • a subframe in which a paging message exists in a frame, and one PF may include one or more POs.
  • FIG. 2 is a schematic flowchart of a paging method according to an embodiment of the present invention, where the method includes:
  • Step 201 When the core network device determines that the synchronization opportunity comes, the core network device determines reference frame information, where the reference frame information includes: a radio frame number.
  • the determining, by the core network device, that the synchronization opportunity arrives may include:
  • the core network device determines that a new base station is connected to the core network device in the paging area; or
  • the core network device determines a synchronization moment to reach each synchronization period; or,
  • the core network device receives a synchronization request message sent by at least one of the paging areas.
  • the specific period length of the synchronization period is not limited in the embodiment of the present invention.
  • the synchronization time in each synchronization period is not limited in the embodiment of the present invention, as long as the core network device sends the reference frame information.
  • the core network device determines the reference frame information, which may include:
  • the core network device pre-stores the initial radio frame number
  • the core network device calculates an absolute time offset between the current time and the initial time, where the initial time is an initial time of the wireless frame indicated by the wireless frame number;
  • the core network device determines the absolute time offset and the initial radio frame number as reference frame information.
  • the determining, by the core network device, the reference frame information may include: the core network device pre-storing the initial radio frame number; and the core network device continuously updating the stored radio frame number to the foregoing according to the duration of the radio frame.
  • the frame number of the current radio frame of the core network device; the core network device reads the radio frame number stored by the core network device.
  • the initial radio frame number pre-stored by the core network device is 0, the initial time is 0, the duration of the radio frame is T, and at time T, the frame number of the current radio frame is 1, and the storage is updated with the frame number 1.
  • the frame number is always the frame number of the current radio frame.
  • the reference frame information may further include: a subframe number.
  • the determining, by the core network device, the reference frame information may include: the core network device pre-storing an initial radio frame number and a subframe number; the core The network device continuously updates the stored radio frame number to the frame number of the current radio frame according to the duration of the system paging frame and the subframe, and updates the stored subframe number to the subframe number of the current subframe in the current radio frame.
  • the core network device reads the radio frame number and the subframe number stored by the core network device.
  • the initial radio frame number pre-stored by the core network device is 0, and the subframe number is 0, initial The time is 0, the duration of the radio frame is T, and each radio frame has 64 subframes.
  • the time is T/64
  • the frame number of the current radio frame is 0, the subframe number is 1, and the frame number is 0.
  • No. 1 updates the stored wireless frame number 0, subframe number 0, time T/32, the frame number of the current radio frame is 0, the subframe number is 2, and the stored wireless is updated with the frame number 0 and the subframe number 2.
  • Frame number 0, subframe number 1, and so on real-time update of the stored radio frame number and subframe number, ensuring that the stored radio frame number and subframe number are always the frame number of the current radio frame and the current sub-frame of the current radio frame.
  • the subframe number of the frame is the frame number of the current radio frame and the current sub-frame of the current radio frame.
  • the core network device maintains the current frame information of the core network device itself, and uses the maintained frame information as the reference frame information; the core network device may also not maintain the current frame information by itself, but from the paging area.
  • the base stations acquire the current frame information of the base station as the reference frame information.
  • the determining, by the core network device, the reference frame information may include:
  • the core network device receives the frame information of the first base station that is sent by the first base station, and determines the frame information of the first base station as the reference frame information; the frame information includes: the first base station sending station a radio frame number of the first base station when the frame information is described; the first base station is a base station in a paging area.
  • the determining, by the core network device, the reference frame information may include:
  • the frame information includes: a radio frame number and a subframe number of the first base station when the first base station sends the frame information; and the first base station is a base station in a paging area.
  • the first base station can actively send the frame information of the first base station to the core network device.
  • the first base station can also send the frame information of the first base station to the core network device when requested by the core network device. ,at this time,
  • the determining, by the core network device, the reference frame information may include:
  • the core network device sends a frame information request to the first base station
  • the core network device receives the frame information of the first base station that is sent by the first base station, and determines the frame information of the first base station as the reference frame information; the frame information includes: the first base station sending station a radio frame number of the first base station when the frame information is described; the first base station is a base station in a paging area.
  • the determining, by the core network device, the reference frame information may include:
  • the core network device sends a frame information request to the first base station
  • the frame information includes: a radio frame number of the first base station when the first base station sends the frame information And a subframe number; the first base station is a base station in a paging area.
  • Step 202 The core network device sends the reference frame information to a base station in a paging area, so that the base station synchronizes a radio frame in the base station according to the reference frame information.
  • the core network device may send the reference frame information to all the base stations in the paging area, or may send the reference frame information to one or some base stations in the paging area, which may be actually applied.
  • the core network device may send the reference frame information only to the new base station, or may send the reference frame information to all the base stations in the paging area.
  • the core network device in this step may only send the reference frame information to the base station that sends the synchronization request message, or may reach all the base stations in the paging area. Send reference frame information.
  • the core network device sends the current reference frame information of the core network device to the base station, where the reference frame information includes: a radio frame number, so that the base station updates the radio frame in the base station according to the reference frame information, so that the core network device and the core network device At least the radio frame number is synchronized between the base stations, and the time difference between the core network device and the base station is limited to the duration of the radio frame, thereby minimizing the time error between cells of different base stations, thereby being able to reduce the UE to a certain extent.
  • the occurrence of the problem of completing the cell reselection before the paging moment of the current cell still misses the paging moment of the new cell.
  • FIG. 3 is a schematic flowchart of another paging method according to an embodiment of the present invention, where the method includes:
  • Step 301 The base station receives reference frame information sent by the core network device, where the frame information includes: a radio frame number.
  • Step 302 The base station synchronizes the radio frame in the base station according to the reference frame information.
  • the synchronizing the radio frame in the base station according to the reference frame information may include:
  • the base station updates the frame number of the current radio frame in the base station to the radio frame number carried in the reference frame information.
  • the frame information may further include: a subframe number, and correspondingly, the base station, according to the reference frame information, the radio frame in the base station, may include:
  • the base station updates the frame number of the current radio frame in the base station to the radio frame number carried in the reference frame information, and updates the subframe number of the current radio frame in the base station to the reference frame information.
  • the frame information may further include: an absolute time offset between the current time and the initial time.
  • the base station according to the reference frame information, the radio frame in the base station, may include:
  • the base station determines the frame number of the current radio frame and the subframe number of the current subframe in the current radio frame according to the absolute time offset and the initial radio frame number.
  • the base station may calculate, according to the absolute time offset and the length of the radio frame, the number of radio frames included in the absolute time offset and the remaining time offset, and calculate the number of subframes included in the remaining time offset according to the remaining time offset and the subframe length;
  • the initial radio frame number is added to the number of radio frames to obtain the frame number of the current radio frame; and the subframe number of the current subframe in the current radio frame is determined according to the number of subframes.
  • the base station may round up the absolute time offset and the length of the radio frame to obtain the number of radio frames, and add the initial radio frame number to the number of radio frames to obtain the frame number of the current radio frame;
  • the subframe number of the current subframe is determined to be 0.
  • the absolute time length / the length of one radio frame 5.x, the rounded up to get the number of radio frames is 6, assuming the initial radio frame number is 0, the frame number of the current radio frame is 6, the subframe number is 0.
  • the base station receives the reference frame information sent by the core network device, where the reference frame information includes: a radio frame number, and synchronizes the radio frame in the base station according to the reference frame information, so that the core network device and the base station At least the wireless frame number synchronization, the time difference between the core network device and the base station is limited to the duration of the radio frame, thereby minimizing the time error between the cells of different base stations, thereby being able to reduce the UE to a certain extent, although currently The occurrence of the problem of the cell reselection before the paging moment of the cell still misses the paging moment of the new cell.
  • the reference frame information includes: a radio frame number
  • FIG. 4 is another schematic flowchart of a paging method according to an embodiment of the present invention, where the method includes:
  • Step 401 When the UE enters an idle state, calculate a paging radio frame (PF, Paging Frame) and PO of the UE;
  • PF paging radio frame
  • Step 402 The UE wakes up at a first moment before the paging moment indicated by the PF and the PO, and determines whether the UE performs cell reselection; time between the first moment and the paging moment. The interval is greater than or equal to the time when the UE completes a cell reselection;
  • the time for the cell reselection is generally determined by the neighbor cell measurement time during the cell reselection process.
  • Step 403 If cell reselection is performed, after the cell reselection is completed, the paging message is monitored on the paging channel of the reselected cell.
  • Step 404 If the cell reselection is not performed, the paging message is monitored on the paging channel of the current cell, or enters a sleep state until the paging moment wakes up to listen to the paging channel on the paging channel of the current cell.
  • the PF and the PO are calculated, and the first time before the paging time indicated by the PF and the PO wakes up to determine whether the UE performs cell reselection;
  • the time interval between the paging moment is greater than or equal to the time when the UE completes a cell reselection; if the cell reselection is performed, after the cell reselection is completed, the paging message is monitored on the paging channel of the reselected cell;
  • the paging message is monitored on the paging channel of the current cell, or enters a sleep state until the paging moment wakes up to listen to the paging channel on the paging channel of the current cell. Therefore, the UE is required to complete the cell reselection before the paging moment of the current cell, and combine with at least the radio frame number synchronization between the foregoing core network device and the base station, to some extent reduce the UE to complete before the paging moment of the current cell. Cell reselection still misses the problem of the paging moment of the new cell.
  • FIG. 5 is a schematic flowchart of a paging method according to an embodiment of the present invention. the method includes:
  • Step 501 When each synchronization opportunity arrives, the core network device determines reference frame information, where the reference frame information includes: a radio frame number and a subframe number, and sends the reference frame information to the base station.
  • the synchronization occasion may include: a new base station in the paging area is connected to the core network device; or, in the paging area, a base station is restarted and reconnected to the core network device; or, each arrives a synchronization time of the synchronization period; or, the core network device receives a synchronization request message sent by at least one of the paging areas.
  • the core network device can determine the synchronization time of the synchronization period by setting the synchronization timer. Specifically, the duration of the synchronization timer is equal to the duration of the synchronization period, and the duration of the specific synchronization period is not limited by the embodiment of the present invention.
  • the core network device resets the synchronization timer after transmitting the reference frame information.
  • the core network device may send the reference frame information by using a newly defined S1 interface message, or may carry the reference frame information by using a newly added IE in an existing message. If the IE is added to the existing message, the message may be a signaling message or a data message sent by the core network device to the base station, which is not limited by the embodiment of the present invention; in addition, one bit that can be reserved in the existing message Indicates whether this message carries frame information. If it is carried, this IE is added in a certain part of the message.
  • the message carrying the reference frame information may be used to indicate whether the base station needs to feed back the acknowledgement message to the SGSN.
  • the synchronization occasion may further include: in step 504, the core network device does not receive the receiving confirmation message sent by one or several base stations within a preset time.
  • the synchronization request message may be: when the base station determines that the time when the last time the frame information is received exceeds a preset period value, the base station sends a synchronization request message to the core network device, where the synchronization request message is used.
  • the reference core frame device is requested to send the reference frame information.
  • the current time here refers to the time at which the base station performs the determining step.
  • the base station may start a synchronization timer every time the frame information is received, and the duration of the synchronization timer is the preset period value, and the synchronization timer expires without receiving new frame information, and the base station determines the current time. The time from when the frame information was last received exceeds the preset period value.
  • step 201 For the method for determining the reference frame information of the core network device, refer to the related description in step 201, and details are not described herein again.
  • Step 502 The base station receives the reference frame information, and updates the frame number of the current radio frame in the base station to the radio frame number carried in the reference frame information, and updates the subframe number of the current radio frame in the base station to The subframe number carried in the reference frame information.
  • Step 503 The base station sends a receiving confirmation message of the reference frame information to the core network device, and the core network device receives the receiving confirmation message sent by each base station within a preset time.
  • the receiving confirmation message may be a newly defined S1 port message, or may be implemented by adding an IE carrying the receiving confirmation message to a control message or a data message sent by the existing base station to the core network device.
  • the base station sends the receiving acknowledgement message, which may be pre-negotiated between the base station and the core network device, or may be indicated by the core network device by using the message carrying the frame information.
  • the step 501 is re-triggered until the preset maximum number of transmissions or the receiving confirmation sent by the base station is received. Message.
  • This step is an optional step.
  • Step 504 The UE sends the eDRX period of the UE to the core network device in a connected state.
  • Step 505 The core network device calculates the PF and the PO of the UE according to the eDRX cycle.
  • the core network device may calculate the PF and the PO of the UE according to the eDRX cycle and the UE identity.
  • the base station forwards the packet to the core.
  • the heartbeat device, the UE identifier may carry the UE identifier when the eDRX cycle is forwarded by the base station;
  • the UE may carry the UE identifier when transmitting the eDRX period.
  • Step 506 When the downlink data of the UE arrives and the UE is in an idle state, the core network device sends a paging message to the base station before the paging moment indicated by the PF and the PO, where the paging message includes the eDRX of the UE. Period and UE identification.
  • the moment when the core network device sends the paging message to the base station is preferably closer to the paging moment between the time when the PF and the PO are calculated and the paging moment.
  • Step 504 to step 506 are: calculating, by the core network device, the PF and the PO of the UE, and storing the paging message to the paging moment indicated by the PF and the PO, and sending the paging message before the paging time indicated by the PF and the PO; in actual applications, the core network may not calculate the PF and the PO of the UE.
  • steps 504 to 506 can also be replaced by the following steps:
  • Step a The core network device receives an eDRX cycle of the UE that is sent by the UE in a connected state.
  • the core network device can save the UE's eDRX cycle in the core network device.
  • Step b When the downlink data of the UE arrives and the UE is in an idle state, the core network device sends a paging message to the base station, where the paging message includes an eDRX cycle of the UE.
  • the sending, by the core network device, the paging message to the base station may include:
  • the core network device determines whether a paging message of the UE is sent after the UE transitions from the connected state to the idle state;
  • the core network device If the core network device does not send the paging message of the UE after the UE transits from the connected state to the idle state, the core network device directly sends the paging message to the base station;
  • the core network device determines the time of sending the paging message according to the time of the last time the paging message is sent and the eDRX period of the UE. When the time when the paging message is sent arrives, the core network device sends the paging message to the base station.
  • the core network device sends the paging message 1 of the UE to each base station, and the paging message to be sent this time is paging message 2, paging message 1 and paging.
  • Message 2 is a different paging message than a copy of the same paging message;
  • the core network device determines that the paging message 1 of the UE is sent after the UE transits from the connected state to the idle state, and the core network device follows the formula according to the time when the paging message 1 was last sent and the eDRX period of the UE.
  • the eDRX period of the UE calculates the transmission of the paging message 2 at a time closest to the current time.
  • the core network device does not send the paging message of the UE to each base station, and the paging message to be sent this time is after the UE transitions from the connected state to the idle state.
  • the first paging message of the UE sent by the base station in this step, the core network device determines that the paging message of the UE is not sent after the UE transits from the connected state to the idle state, and the core network device does not calculate the paging message separately.
  • the sending time directly sends a paging message to the base station.
  • the sending, by the core network device, the paging message to the base station may include:
  • the core network device determines whether a paging message of the UE is sent after the UE transitions from the connected state to the idle state;
  • the core network device If the core network device does not send the paging message of the UE after the UE transits from the connected state to the idle state, the core network device directly sends the paging message to the base station;
  • the core network device determines the current paging according to the pre-stored transmission reference time and the reference time interval, and the eDRX cycle of the UE.
  • the time of the message when the time when the paging message is sent this time, the core network device sends the paging message to the base station.
  • m is a natural number, and the value of m is preferably such that the calculated paging message transmission time exceeds the current time and is closest to the current time.
  • the sending reference time and the reference time interval stored in the core network device are continuously updated, and the updated principles and methods may be:
  • the core network device updates the sending reference time by using the sending time of the paging message, and receives the first time interval sent by the base station when performing step c each time the paging message is sent.
  • the first time interval updates the reference time interval.
  • the core network device may update the reference time interval corresponding to the base station by using the first time interval sent by the corresponding base station.
  • Step c The base station receives the paging message, calculates the PF and the PO of the UE according to the eDRX period, and determines that the time interval between the paging time indicated by the PF and the PO indicated by the UE is greater than the preset time threshold.
  • the core network device sends a first time interval; the first time interval is less than or equal to a time interval of the paging time of the UE from the current time; performing step d;
  • step 508 is performed if the base station determines that the time interval of the paging time from the current time is less than the preset time threshold
  • the base station that receives the paging message may not send the first time interval to the core network device, but the first time interval is sent by the part of the base station, and the specific time interval may or may not be sent by the specific base station. It is set that at least one base station sends the first time interval as long as the time interval between the paging time indicated by the PF and the PO of the UE is greater than the preset time threshold.
  • the paging message may include a recommended cell list or a recommended base station list; if the paging message includes a recommended cell list, the base station may be used by the base station of the cell listed in the recommended cell list.
  • the device sends the first time interval. If the paging message includes the recommended base station list, the first time interval may be sent to the core network device by the base station listed in the recommended base station list.
  • Step d The core network device receives the first time interval sent by the base station.
  • Step e The core network device sends a paging message to the base station according to the received first time interval.
  • the sending, by the core network device, the paging message to the base station according to the received first time interval may include:
  • the core network device For each base station, the core network device sends a paging message to the base station after the first time interval of the base station according to the first time interval sent by the base station; or
  • the core network device selects a minimum first time interval from a first time interval sent by each base station, and sends a paging message to each base station after the minimum first time interval.
  • the core network device may send a paging message to the base station in the paging area after the first time interval of the base station;
  • the core network device may select a minimum first time interval, and send a paging message to the base station in the paging area after the minimum first time interval; the core network device also A paging message can be sent to each base station at a first time interval of each base station.
  • the core network device includes: for a subsequent paging message sent to the terminal, the core network may be based on the base station The first time interval of transmission and the paging eDRX period of the terminal calculate the subsequent paging frame position of the terminal.
  • the core network saves the paging message of the terminal before the base station reports the time interval.
  • the core network may calculate a subsequent paging frame location of the terminal based on the time interval fed back by the base station and the paging eDRX period of the terminal.
  • the specific calculation formula may be: a paging frame position where the base station feedback time interval is located + N* paging eDRX period.
  • the core network device selects the smallest first time interval from the After the minimum first time interval, the paging message is sent to the base station in the paging area. Since the core network device selects the smallest first time interval, the paging time indicated by the PF and PO of the UE for a certain base station The time interval that the base station receives the paging message sent by the core network device may still be greater than the preset time threshold. In this case, the base station may send the first time interval to the core network device again until the paging time is received from the base station.
  • the time interval of the paging message sent by the core network device is less than the preset time threshold, or the base station sends the consecutive times of the first time interval to the core network device to reach a preset number of times threshold; after that, the base station performs step 507.
  • the base network device may indicate the number of times of the base station to each base station by using a paging message, or may set the number of times of the base station to the base station in advance.
  • Step 507 The base station receives the paging message, and calculates the PF and PO of the UE according to the eDRX period carried therein and the UE identifier.
  • Step 508 When the UE enters the idle state, the UE calculates the PF and PO of the UE according to the eDRX period and the UE identifier, wakes up at the first moment before the paging moment indicated by the PF and the PO, and determines whether the UE performs cell reselection. After cell reselection, after performing cell reselection, the paging message is monitored on the paging channel of the reselected cell; if cell reselection is not performed, the paging message is monitored on the paging channel of the current cell, or enters a sleep state until seeking Wake up before the call to listen to the paging channel on the paging channel of the current cell.
  • the time interval between the first moment and the paging moment is greater than or equal to a time when the UE completes a cell reselection.
  • the time interval between the first moment and the paging moment is preferably greater than or equal to the time when the UE completes a cell reselection and a radio frame. The sum of time.
  • step 507 There is no execution order restriction between step 507 and step 508, and the two steps may be performed before step 509 respectively.
  • Step 509 At the paging moment indicated by the PF and the PO of the UE, the base station to which the UE is located sends a paging message to the UE, and the UE receives the paging message.
  • the UE When the UE receives the paging message, the UE initiates a random access procedure to establish a connection with the base station and the core network device, and the core network device sends the downlink data to the UE after the UE accesses the network, and the process is no longer Narration.
  • the core network device maintains the synchronization status of the radio frame and the subframe in the same paging area to implement the basic synchronization of the paging moments of the UE in different paging cells.
  • the core network device maintains the synchronization status of the radio frame and the subframe in the same paging area to implement the basic synchronization of the paging moments of the UE in different paging cells.
  • the paging moment of the new cell will not be missed, because as long as it is the same paging area, the paging time of the pre-reselected cell and the reselection are small.
  • the paging moments of the zones are the same at the time.
  • the core network device sends the paging message to the base station before saving the paging message, which can reduce the storage time of the paging message by the base station;
  • the UE wakes up at the first moment before the arrival of the paging moment to check whether the cell reselection is performed, and ensures that the paging moment does not occur during the cell reselection process to prevent the UE from missing the paging moment.
  • FIG. 6 is a schematic flowchart of a paging method according to an embodiment of the present invention. the method includes:
  • Step 601 When each synchronization opportunity arrives, the core network device determines reference frame information, where the reference frame information includes: a radio frame number and a subframe number, and sends the reference frame information to the base station.
  • step 501 For the implementation of this step, reference may be made to step 501, which is not described here.
  • Step 602 The base station receives the reference frame information, and updates the frame number of the current radio frame in the base station to the radio frame number carried in the reference frame information, and updates the subframe number of the current radio frame in the base station to The subframe number carried in the reference frame information.
  • Step 603 The base station sends a receiving confirmation message of the reference frame information to the core network device, and the core network device receives the receiving confirmation message sent by each base station within a preset time.
  • the receiving confirmation message may be a newly defined S1 port message, or may be implemented by adding an IE carrying the receiving confirmation message to a control message or a data message sent by the existing base station to the core network device.
  • the base station sends the receiving acknowledgement message, which may be pre-negotiated between the base station and the core network device, or may be indicated by the core network device by using the message carrying the frame information.
  • the step 501 is re-triggered until the preset maximum number of transmissions or the receiving confirmation sent by the base station is received. Message.
  • This step is an optional step.
  • Step 604 The core network device receives an eDRX cycle of the UE that is sent by the UE in a connected state.
  • the core network device may save the eDRX cycle of the UE in the core network device.
  • Step 605 When the downlink data of the UE arrives and the UE is in an idle state, the core network device determines whether the paging message of the UE is sent after the UE transits from the connected state to the idle state, and if not, the core network The device directly sends the paging message to the base station; if yes, the core network device determines the time of sending the paging message according to the time when the paging message of the UE is last sent and the eDRX period of the UE, and sends the paging message this time. When the time comes, the core network device sends a paging message to the base station.
  • the paging message includes: a UE identifier.
  • the core network device sends the paging message 1 of the UE to each base station, and the paging message to be sent this time is the paging message 2;
  • the core network device determines that the paging message 1 of the UE is sent after the UE transits from the connected state to the idle state, and the core network device follows the formula according to the time when the paging message 1 was last sent and the eDRX period of the UE.
  • the eDRX period of the UE calculates the transmission of the paging message 2 at a time closest to the current time.
  • the core network device does not send the paging message of the UE to each base station, and the paging message to be sent this time is after the UE transits from the connected state to the idle state.
  • the sending time of the paging message can immediately send a paging message to the base station.
  • Step 606 The base station receives the paging message, and calculates the PF and the PO of the UE according to the eDRX period. The base station determines whether the time interval between the paging time indicated by the PF and the PO of the UE is greater than a preset time threshold. If yes, the first time interval is sent to the core network device, where the first time interval is less than or equal to the time interval of the paging time of the UE from the current time, step 607 is performed; if not, step 609 is performed.
  • the first time interval may be used to indicate, to the core network device, a paging moment of the UE calculated by the base station that sends the first time interval.
  • the information transmission delay and the processing time delay between the base station and the core network device are not considered, and the first time interval may be equal to the time interval of the paging time of the UE from the current time, and the core network device may be currently Adding the first time interval to the paging time of the UE; if considering the delay and processing delay of information transmission between the base station and the core network device, the first time interval needs to be smaller than the paging time of the UE from the current time.
  • the time interval may be: the time interval of the paging time of the UE from the current time - the transmission delay - the processing delay, the core network device may still add the first time interval to the current time to obtain the UE's homing Call the moment.
  • the threshold value of the first time interval for the same paging message to be sent to the core network device may be set for each base station, and the threshold may be indicated by the core network device to each base station, for example, sent to the base station.
  • the number of times the threshold value is carried in the call message, or the number of times threshold of the base station may be preset in the base station.
  • step 609 Determining whether the number of consecutive times that the base station sends the first time interval to the core network device To the number of times threshold, if the number of times threshold is reached, step 609 is performed; if the number of times threshold is not reached, step 607 is performed.
  • the base station that receives the paging message may not send the first time interval to the core network device, but the first time interval is sent by the part of the base station, and the specific time interval may or may not be sent by the specific base station. It is set that at least one base station sends the first time interval as long as the time interval between the paging time indicated by the PF and the PO of the UE is greater than the preset time threshold.
  • the paging message may include a recommended cell list or a recommended base station list; if the paging message includes a recommended cell list, the base station may be used by the base station of the cell listed in the recommended cell list.
  • the device sends the first time interval. If the paging message includes the recommended base station list, the first time interval may be sent to the core network device by the base station listed in the recommended base station list.
  • the base station For the base station that does not send the first time interval to the core network device, when the core network device sends the paging message in step 605, or when the core network device sends the paging message again in step 608, the base station receives the paging message.
  • the PF and PO of the UE are calculated according to the eDRX cycle, and then steps 609-610 are performed.
  • Step 607 The core network device receives the first time interval sent by the base station.
  • Step 608 The core network device sends a paging message to the base station according to the received first time interval; step 606 is performed;
  • the sending, by the core network device, the paging message to the base station according to the received first time interval may include:
  • the core network device For each base station, the core network device sends a paging message to the base station after the first time interval of the base station according to the first time interval sent by the base station; or
  • the core network device selects a minimum first time interval from a first time interval sent by each base station, and sends a paging message to each base station after the minimum first time interval.
  • the core network device may send a paging message to the base station in the paging area after the first time interval of the base station;
  • the core network device may select a minimum first time interval, and send a paging message to the base station in the paging area after the minimum first time interval; the core network device also A paging message can be sent to each base station at a first time interval of each base station.
  • the method includes: for a subsequent paging message sent to the UE, the core network device may be based on the The first time interval sent by the base station and the eDRX period of the UE calculate the subsequent paging frame position of the UE.
  • the core network saves the paging message of the UE before the time interval is reported by the base station.
  • the core network may calculate a subsequent paging frame position of the UE based on the first time interval fed back by the base station and the eDRX period of the UE.
  • the specific calculation formula may be: the base station feeds back the paging frame position where the first time interval is located + N* paging eDRX period, where N is a natural number.
  • Step 609 When the UE enters the idle state, the UE calculates the PF and the PO of the UE according to the eDRX period and the UE identifier, wakes up at the first moment before the paging moment indicated by the PF and the PO, and determines whether the UE performs cell reselection. After cell reselection, after performing cell reselection, the paging message is monitored on the paging channel of the reselected cell; if cell reselection is not performed, the paging message is monitored on the paging channel of the current cell, or enters a sleep state until seeking Wake up before the call to listen to the paging channel on the paging channel of the current cell.
  • the time interval between the first moment and the paging moment is greater than or equal to a time when the UE completes a cell reselection.
  • the time interval between the first moment and the paging moment is preferably greater than or equal to the time when the UE completes a cell reselection and a radio frame. The sum of time.
  • Step 610 At the paging moment indicated by the PF and the PO of the UE, the base station to which the UE is located sends a paging message to the UE, and the UE receives the paging message.
  • the UE When the UE receives the paging message, the UE initiates a random access procedure to establish a connection with the base station and the core network device, and the core network device sends the downlink data to the UE after the UE accesses the network, and the process is no longer Narration.
  • the core network device maintains the synchronization status of the radio frame and the subframe in the same paging area to implement the basic synchronization of the paging moments of the UE in different paging cells.
  • the eDRX mechanism even the UE If cell reselection occurs, as long as the cell reselection is completed before the paging time arrives, the paging moment of the new cell will not be missed, because as long as it is the same paging area, the paging time of the pre-reselected cell and the cell after the reselection are sought.
  • the call time is the same at the time.
  • the core network device sends the paging message to the base station before saving the paging message, which can reduce the storage time of the paging message by the base station;
  • the UE wakes up at the first moment before the arrival of the paging moment to check whether the cell reselection is performed, and ensures that the paging moment does not occur during the cell reselection process to prevent the UE from missing the paging moment.
  • FIG. 7 is a schematic flowchart of a paging method according to an embodiment of the present invention. the method includes:
  • Step 701 When each synchronization opportunity arrives, the core network device determines reference frame information, where the reference The frame information includes: a radio frame number and a subframe number, and the reference frame information is sent to the base station.
  • step 501 For the implementation of this step, reference may be made to step 501, which is not described here.
  • Step 702 The base station receives the reference frame information, and updates the frame number of the current radio frame in the base station to the radio frame number carried in the reference frame information, and updates the subframe number of the current radio frame in the base station to The subframe number carried in the reference frame information.
  • Step 703 The base station sends a receiving confirmation message of the reference frame information to the core network device, and the core network device receives the receiving confirmation message sent by each base station within a preset time.
  • the receiving confirmation message may be a newly defined S1 port message, or may be implemented by adding an IE carrying the receiving confirmation message to a control message or a data message sent by the existing base station to the core network device.
  • the base station sends the receiving acknowledgement message, which may be pre-negotiated between the base station and the core network device, or may be indicated by the core network device by using the message carrying the frame information.
  • the step 501 is re-triggered until the preset maximum number of transmissions or the receiving confirmation sent by the base station is received. Message.
  • This step is an optional step.
  • Step 704 The core network device receives an eDRX cycle of the UE that is sent by the UE in a connected state.
  • the core network device may save the eDRX cycle of the UE in the core network device.
  • Step 705 When the downlink data of the UE arrives and the UE is in an idle state, the core network device determines whether a paging message of the UE is sent after the UE transitions from the connected state to the idle state, and if not, the core network The device directly sends the paging message to the base station, and step 707 is performed; if yes, step 706 is performed;
  • Step 706 The core network device determines the time for sending the paging message according to the time of the last time the paging message of the UE is sent, the eDRX period, and the second time interval corresponding to the paging message of the last time the UE is sent.
  • the core network device sends a paging message to the base station, and step 707 is performed;
  • the second time interval corresponding to the paging message sent by the UE in the last time is the second time interval carried in the paging response message that each base station corresponds to when the paging message of the UE is sent by the core network device.
  • the time that the core network device determines the time for sending the paging message according to the time of the last time the paging message of the UE is sent, the eDRX period, and the second time interval corresponding to the paging message of the last time the UE is sent may include:
  • the core network device selects a second time interval with the smallest value from the second time interval
  • the core network device determines the time when the paging message is sent according to the following formula:
  • the time when the paging message is sent this time the time of the last time the paging message of the UE is sent + the M*eDRX period + the second time interval with the smallest value; M is a natural number, and the value of M is preferably such that the calculated current transmission The time of the paging message is after the current time and is closest to the current time.
  • the time for sending the paging message calculated in the above formula may be reduced by the transmission delay and The processing delay is corrected. If the second time interval fed back by the base station considers the transmission delay and the processing delay between the base station and the core network device, the time for sending the paging message calculated in the above formula may not be performed. Corrected.
  • Step 707 The base station receives the paging message, calculates the PF and the PO of the UE according to the eDRX period, and sends a paging response message to the core network device.
  • the paging response message includes: a second time interval; Determining, to the core network device, a paging moment indicated by the PF and the PO of the UE;
  • the second time interval may be equal to the time interval between the paging time indicated by the PF and the PO of the UE, and the current time interval; The transmission delay and the processing delay between the network devices.
  • the second time interval may be smaller than the time interval between the paging time indicated by the PF and the PO of the UE, and may be: the PF and the PO indicated by the UE. Time interval from the current time - transmission delay - processing delay.
  • Step 708 When the UE enters the idle state, calculate the PF and PO of the UE according to the eDRX period and the UE identifier, wake up at the first moment before the paging moment indicated by the PF and the PO, and determine whether the UE performs cell reselection. After cell reselection, after performing cell reselection, the paging message is monitored on the paging channel of the reselected cell; if cell reselection is not performed, the paging message is monitored on the paging channel of the current cell, or enters a sleep state until seeking Wake up before the call to listen to the paging channel on the paging channel of the current cell.
  • the time interval between the first moment and the paging moment is greater than or equal to a time when the UE completes a cell reselection.
  • the time interval between the first moment and the paging moment is preferably greater than or equal to the time when the UE completes a cell reselection and a radio frame. The sum of time.
  • Step 709 At the paging moment indicated by the PF and the PO of the UE, the base station to which the UE is located sends a paging message to the UE, and the UE receives the paging message.
  • the UE When the UE receives the paging message, the UE initiates a random access procedure, and establishes a base station and a core. After the network device is connected, the core network device sends downlink data to the UE after the UE accesses the network. This process is not described here.
  • the core network device maintains the synchronization status of the radio frame and the subframe in the same paging area to implement the basic synchronization of the paging moments of the UE in different paging cells.
  • the eDRX mechanism even the UE If cell reselection occurs, as long as the cell reselection is completed before the paging time arrives, the paging moment of the new cell will not be missed, because as long as it is the same paging area, the paging time of the pre-reselected cell and the cell after the reselection are sought.
  • the call time is the same at the time.
  • the core network device sends the paging message to the base station before saving the paging message, which can reduce the storage time of the paging message by the base station;
  • the UE wakes up at the first moment before the arrival of the paging moment to check whether the cell reselection is performed, and ensures that the paging moment does not occur during the cell reselection process to prevent the UE from missing the paging moment.
  • the embodiment of the present invention provides a core network device.
  • the core network device 800 includes:
  • the processor 810 is configured to determine, when the synchronization opportunity comes, the core network device determines reference frame information, where the reference frame information includes: a radio frame number;
  • the transmitter 820 is configured to send, by the base station in the paging area, the reference frame information determined by the processor, so that the base station synchronizes the radio frame in the base station according to the reference frame information.
  • the processor is specifically configured to:
  • the processor is specifically configured to:
  • the absolute time offset and the initial radio frame number are determined as reference frame information.
  • the processor is specifically configured to:
  • Reading the wireless frame number stored by the core network device is
  • the frame information further includes: a subframe number; the processor is specifically configured to:
  • it also includes:
  • a receiver configured to receive frame information of the first base station that is sent by the first base station, where the frame information includes: a radio frame number of the first base station when the first base station sends the frame information;
  • a base station is a base station in a paging area;
  • the processor is further configured to: determine frame information of the first base station as the reference frame information.
  • it also includes:
  • a receiver configured to receive frame information of the first base station that is sent by the first base station, where the frame information includes: a radio frame number and a subframe number of the first base station when the first base station sends the frame information;
  • the first base station is a base station in a paging area;
  • the processor is further configured to: determine frame information of the first base station as the reference frame information.
  • the transmitter is further configured to: before the receiver receives the frame information of the first base station, send a frame information request to the first base station.
  • it also includes:
  • a receiver configured to receive a receiving confirmation message sent by the base station after receiving the frame information.
  • it also includes:
  • a receiver configured to receive an eDRX cycle of the UE that is sent by the UE in a connected state
  • the processor is further configured to: calculate a PF and a PO of the UE according to the eDRX cycle;
  • the transmitter is further configured to: when the downlink data of the UE arrives and the UE is in an idle state, send a paging message to the base station before the paging moment indicated by the PF and the PO, so that the base station The paging message is sent to the UE.
  • the moment when the core network device sends the paging message to the base station is closer to the paging moment between the time when the PF and the PO are calculated and the paging moment.
  • it also includes:
  • a receiver configured to receive an eDRX cycle of the UE that is sent by the UE in a connected state
  • a transmitter configured to send a paging message to the base station when the downlink data of the UE arrives, and the UE is in an idle state, where the paging message includes an eDRX period of the UE;
  • the receiver is further configured to: receive a first time interval sent by the base station, where the first time interval calculates, according to the eDRX period, the PF and PO of the UE, and determines a PF of the UE. And sending, when the paging time indicated by the PO is greater than a preset time threshold, and the first time interval is less than or equal to a time interval of the paging time of the UE from the current time;
  • the transmitter is further configured to: send a paging message to the base station according to the received first time interval.
  • the transmitter is specifically configured to send, to each base station, a paging message to the base station after the first time interval of the base station according to the first time interval sent by the base station;
  • a minimum first time interval is selected from the first time interval transmitted by each base station, and a paging message is sent to each base station after the minimum first time interval.
  • the transmitter is specifically configured to:
  • the transmitter is specifically configured to:
  • the core network device Determining that the paging message sent by the UE after the UE transitions from the connected state to the idle state, determining the time of sending the paging message according to the pre-stored transmission reference time and the reference time interval, and the eDRX period of the UE, When the time when the paging message is sent, the core network device sends the paging message to the base station.
  • the processor is further configured to:
  • the transmission reference time is updated using the transmission time of the paging message, and the reference time interval is updated using the received first time interval.
  • it also includes:
  • a receiver configured to receive an eDRX cycle of the UE that is sent by the UE in a connected state
  • the processor is further configured to: when the downlink data of the UE arrives and the UE is in an idle state, and after determining that the UE sends a paging message of the UE after transitioning from a connected state to an idle state, according to the The time when the paging message of the UE is sent the last time, the eDRX period of the UE, and the second time interval corresponding to the paging message of the last time the UE is sent to determine the time when the paging message is sent this time;
  • the transmitter is further configured to: when the downlink data of the UE arrives and the UE is in an idle state, and after determining that the UE does not send the paging message of the UE after transitioning from the connected state to the idle state, Instantly sending a paging message to the base station; or, when the downlink data of the UE arrives and the UE is in an idle state, and determining that the UE sends a paging message of the UE after transitioning from the connected state to the idle state Sending a paging message to the base station when the time when the paging message is sent arrives;
  • the second time interval corresponding to the paging message sent by the UE in the last time is: the second time interval carried in the paging response message that each base station corresponds to when the paging message of the UE is sent by the core network device last time;
  • the second time interval is used to indicate, to the core network device, a paging moment of the UE calculated by the base station.
  • the processor is specifically configured to: select a second time interval in which the value is the smallest from the second time interval;
  • the time when the paging message is sent this time the time of the last time the paging message of the UE is sent + M*eDRX period + the second time interval where the value is the smallest; M is a natural number.
  • the core network device sends the current reference frame information of the core network device to the base station, where the reference frame information includes: a radio frame number, so that the base station updates the radio frame in the base station according to the reference frame information, so that the core network device and the core network device At least the radio frame number is synchronized between the base stations, and the time difference between the core network device and the base station is limited to the duration of the radio frame, thereby minimizing the time error between cells of different base stations, thereby being able to reduce the UE to a certain extent.
  • the occurrence of the problem of completing the cell reselection before the paging moment of the current cell still misses the paging moment of the new cell.
  • An embodiment of the present invention further provides a base station.
  • the base station 900 includes:
  • the receiver 910 is configured to receive reference frame information sent by the core network device, where the reference frame information includes: a radio frame number;
  • the processor 920 is configured to synchronize the radio frame in the base station according to the reference frame information received by the receiver.
  • the processor is specifically configured to:
  • the initial radio frame number is added to the number of radio frames to obtain the frame number of the current radio frame, and the subframe number of the current subframe in the current radio frame is determined according to the number of subframes.
  • the processor is specifically configured to:
  • the frame information further includes: a subframe number; the processor is specifically configured to:
  • the base station further includes:
  • a transmitter configured to send a receiving confirmation message of the reference frame information to the core network device.
  • the base station further includes:
  • the receiver is further configured to: receive a paging message sent by the core network device;
  • the processor is further configured to: calculate a PF and a PO of the UE according to the eDRX period and the UE identifier carried in the paging message;
  • the transmitter is further configured to: send a paging message of the UE at a paging moment indicated by the PF and the PO of the UE.
  • the base station further includes:
  • the receiver is further configured to: receive a paging message sent by the core network device;
  • the processor is further configured to: calculate a PF and a PO of the UE according to the eDRX period and the UE identifier carried in the paging message; and determine that the paging interval indicated by the PF and the PO is greater than a preset time by a preset time Determining a first time interval when the threshold is reached;
  • the transmitter is further configured to: send the determined first time interval to the core network device; the first time interval is less than or equal to a time interval of the paging time from the current time;
  • the receiver is further configured to: receive a paging message of the UE that is sent by the core network device according to the first time interval.
  • the processor is further configured to:
  • it also includes:
  • the receiver is further configured to: receive a paging message sent by the core network device;
  • the processor is further configured to: calculate a PF and a PO of the UE according to the eDRX period and the UE identifier carried in the paging message; and determine a second time according to a time interval of the paging time indicated by the PF and the PO from the current time interval;
  • the method further includes: a transmitter, configured to send the second time interval in a paging response message to the core network device; and the second time interval is used to indicate the PF and the PO to the core network device Indicated paging moment.
  • the transmitter is further configured to: when the processor determines that the time when the last time the reference frame information is received exceeds a preset period value, send a synchronization request message to the core network device, where The synchronization request message is used to request the core network device to send current frame information.
  • the base station receives the reference frame information sent by the core network device, where the reference frame information includes: a radio frame number, and synchronizes the radio frame in the base station according to the reference frame information, so that the core network device and the base station At least the wireless frame number synchronization, the time difference between the core network device and the base station is limited to the duration of the radio frame, thereby minimizing the time error between the cells of different base stations, thereby being able to reduce the UE to a certain extent, although currently The occurrence of the problem of the cell reselection before the paging moment of the cell still misses the paging moment of the new cell.
  • the reference frame information includes: a radio frame number
  • the embodiment of the present invention further provides a user equipment.
  • the user equipment 1000 includes:
  • the processor 1010 is configured to calculate a PF and a PO of the user equipment when entering an idle state, wake up at a first moment before a paging moment indicated by the PF and the PO, and determine whether the user equipment performs cell reselection.
  • the time interval between the first moment and the paging moment is greater than or equal to a time when the user equipment completes a cell reselection; if cell reselection is performed, cell reselection is completed;
  • the receiver 1020 is configured to: when the processor determines to perform cell reselection, monitor a paging message on a paging channel of the reselected cell; and the processor determines a paging channel in the current cell when the cell reselection is not performed. Listening to the paging message or going to sleep until the paging moment wakes up to listen to the paging message on the paging channel of the current cell.
  • the time interval between the first moment and the paging moment is greater than or equal to the user setting The sum of the time to complete a cell reselection and the duration of a radio frame.
  • the calculated PF and PO wake up at the first moment before the paging moment indicated by the PF and the PO, and determine whether the UE performs cell reselection;
  • the time interval between the moment and the paging moment is greater than or equal to the time when the UE completes a cell reselection; if the cell reselection is performed, after the cell reselection is completed, the paging message is monitored on the paging channel of the reselected cell. ;
  • the paging message is monitored on the paging channel of the current cell, or enters a sleep state until the paging moment wakes up to listen to the paging channel on the paging channel of the current cell. Therefore, the UE is required to complete the cell reselection before the paging moment of the current cell, and combine with at least the radio frame number synchronization between the foregoing core network device and the base station, to some extent reduce the UE to complete before the paging moment of the current cell. Cell reselection still misses the problem of the paging moment of the new cell.
  • the techniques in the embodiments of the present invention can be implemented by means of software plus a necessary general hardware platform. Based on such understanding, the technical solution in the embodiments of the present invention may be embodied in the form of a software product in essence or in the form of a software product, which may be stored in a storage medium such as a ROM/RAM. , a disk, an optical disk, etc., including instructions for causing a computer device (which may be a personal computer, server, or network device, etc.) to perform the methods described in various embodiments of the present invention or portions of the embodiments.
  • a computer device which may be a personal computer, server, or network device, etc.

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Abstract

本发明实施例公开了一种寻呼方法、核心网设备、基站及用户设备，方法包括：核心网设备确定同步时机到来时，所述核心网设备确定基准帧信息，所述基准帧信息包括：无线帧号；所述核心网设备向寻呼区中的基站发送所述基准帧信息，以便所述基站根据所述基准帧信息同步所述基站中的无线帧。本发明实施例能够减少UE无法监听寻呼消息问题的发生。

Description

寻呼方法、用户设备、基站及核心网设备
本申请要求于2015年5月19日提交、国际申请号为PCT/CN2015/079312、发明名称为“寻呼方法、用户设备、基站及核心网设备”的PCT专利申请的优先权，其全部内容通过引用结合在本申请中。
技术领域
本发明涉及通信技术领域，特别涉及一种寻呼(Paging)方法、用户设备、基站及核心网设备。
背景技术
机器和机器(M2M，Machine-to-Machine)，是机器与机器之间通过无线网络互相传递信息和数据的简称，是移动通信下一步发展的重要方向。它广泛应用于多个领域，包括智能交通、楼控系统、家庭智能控制系统、视频监控系统、工业监测等。
在M2M系统中，当核心网有下行数据需要发送给用户设备(UE，User Equipment)时，核心网设备启动寻呼定时器，并向寻呼区内的所有基站发送携带UE标识(ID)的寻呼消息；寻呼区内的基站在接收到该寻呼消息时，根据该寻呼消息中携带的UE标识，计算UE标识对应的UE在空口上的最近一个寻呼场合(PO，Paing occasion)，并在该PO到来时，将寻呼消息发送给UE标识对应的UE。UE标识对应的UE在接收到寻呼消息后发起随机接入过程，建立与基站和核心网的连接，核心网在UE接入网络后发送下行数据给UE。寻呼超帧(PSF，Paging Super frame)PF和PO决定了寻呼时刻。
为了达到UE在空闲态下省电的目的，在M2M系统中引入了扩展的非连续接受(eDRX，Extended Discontinuous Reception)机制，UE在空闲状态下对寻呼信道的监听采用eDRX方式。也即：UE只在每个eDRX激活期的寻呼时刻到来时才监听寻呼信道，若没有监听到寻呼消息就进入睡眠状态，等待下一个寻呼时刻到来时再醒来监听寻呼信道，从而降低了UE的功耗。具体的，UE自己维护一个UE-specific的eDRX周期，UE通过NAS消息或其它方式将eDRX周期上 报给核心网设备，核心网设备在下发寻呼消息时将eDRX周期和UE标识等信息携带在paging消息中下发给基站，基站根据这些信息计算UE的寻呼超帧(PSF，Paging Super frame)和PO，在PSF和PO指示的寻呼时刻发送寻呼消息；UE根据自己的eDRX周期和UE标识等信息计算PSF和PO，在PSF和PO指示的寻呼时刻接收寻呼消息。UE计算出来的PSF和PO与各基站计算出来的PSF和PO应该是相同的。其中，PSF是存在PO的超帧，PO是寻呼超帧中存在寻呼消息的帧。
发明人发现目前的寻呼方法具有如下问题：考虑到UE的移动性，如果UE在空闲态时在不同的小区之间发生了移动，UE可能在当前小区的寻呼时刻到来前发生小区重选，重选到另外一个新小区，而重选完成时新小区的寻呼时刻已经过去，从而UE错过了所述当前小区的寻呼时刻，也错过了新小区的寻呼时刻，UE进行小区重选后只能等下一个eDRX周期的寻呼时刻到来才能接收寻呼消息。由于M2M系统中eDRX周期较长，长达一小时或者数小时，UE在重选到新小区后，可能要等待将近一个eDRX周期的时间才能等到下一个寻呼时刻的到来，由于等待的时间较长，UE很可能在这段时间里再次发生小区重选，从而再次错过当前小区快要到来的寻呼时刻，重选到新小区后也可能刚好错过新小区的寻呼时刻，如此类推，如果UE一直运动，可能在等待时间内不断出现小区重选，导致UE一直等不到寻呼时刻，无法接收寻呼消息。
发明内容
本发明实施例中提供了一种寻呼方法、UE、基站及核心网设备，能够减少UE无法监听寻呼消息问题的发生。
为了解决上述技术问题，本发明实施例公开了如下技术方案：
第一方面，本发明实施例提供一种寻呼方法，包括：
核心网设备确定同步时机到来时，所述核心网设备确定基准帧信息，所述基准帧信息包括：无线帧号；
所述核心网设备向寻呼区中的基站发送所述基准帧信息，以便所述基站根据所述基准帧信息同步所述基站中的无线帧。
结合第一方面，在第一方面第一种可能的实现方式中，所述核心网设备确定同步时机到来包括：
所述核心网设备确定所述寻呼区中有新基站连接至所述核心网设备；或者，
所述核心网设备确定所述寻呼区中有基站重启后重新连接至所述核心网设备；或者，
所述核心网设备确定到达每个同步周期的同步时刻；或者，
所述核心网设备接收到所述寻呼区中的至少一个基站发送的同步请求消息。
结合第一方面，和/或第一方面第一种可能的实现方式，在第一方面第二种可能的实现方式中，所述核心网设备确定基准帧信息，包括：
核心网设备预先存储初始的无线帧号；
核心网设备计算当前时间与初始时刻之间的绝对时间偏差，所述初始时刻是所述无线帧号指示的无线帧的初始时刻；
核心网设备将所述绝对时间偏差和所述初始的无线帧号确定为基准帧信息。
结合第一方面，和/或第一方面第一种可能的实现方式，在第一方面第三种可能的实现方式中，所述核心网设备确定基准帧信息，包括：
所述核心网设备预先存储初始的无线帧号；
所述核心网设备根据无线帧的时长持续将存储的所述无线帧号更新为所述核心网设备当前无线帧的帧号；
所述核心网设备读取所述核心网设备存储的无线帧号。
结合第一方面，和/或第一方面第一种可能的实现方式，在第一方面第四种可能的实现方式中，所述基准帧信息还包括：子帧号；所述核心网设备确定基准帧信息，包括：
所述核心网设备预先存储初始的无线帧号和子帧号；
所述核心网设备根据系统寻呼帧和子帧的时长持续将存储的所述无线帧号更新为当前无线帧的帧号、将存储的所述子帧号更新为当前无线帧中当前子帧的子帧号；
所述核心网设备读取所述核心网设备存储的无线帧号和子帧号。
结合第一方面，和/或第一方面第一种可能的实现方式，在第一方面第五种可能的实现方式中，所述核心网设备确定基准帧信息，包括：
所述核心网设备接收第一基站发送的所述第一基站的帧信息，将所述第一基站的帧信息确定为所述基准帧信息；
所述帧信息包括：所述第一基站发送所述帧信息时所述第一基站的无线帧号；所述第一基站是寻呼区中的基站。
结合第一方面，和/或第一方面第一种可能的实现方式，在第一方面第六种 可能的实现方式中，所述核心网设备确定基准帧信息，包括：
所述核心网设备接收第一基站发送的所述第一基站的帧信息，将所述第一基站的帧信息确定为所述基准帧信息；
所述帧信息包括：所述第一基站发送所述帧信息时所述第一基站的无线帧号和子帧号；所述第一基站是寻呼区中的基站。
结合第一方面第五种可能的实现方式，和/或第一方面第六种可能的实现方式，在第一方面第七种可能的实现方式中，所述核心网设备确定基准帧信息，还包括：
在接收所述第一基站的帧信息之前，所述核心网设备向所述第一基站发送帧信息请求。
结合第一方面，和/或第一方面第一种可能的实现方式，和/或第一方面第二种可能的实现方式，和/或第一方面第三种可能的实现方式，和/或第一方面第四种可能的实现方式，和/或第一方面第五种可能的实现方式，和/或第一方面第六种可能的实现方式，和/或第一方面第七种可能的实现方式，在第一方面第八种可能的实现方式中，所述核心网设备向基站发送所述帧信息之后，还包括：
所述核心网设备接收所述基站在接收到所述帧信息后发送的接收确认消息。
结合第一方面，和/或第一方面第一种可能的实现方式，和/或第一方面第二种可能的实现方式，和/或第一方面第三种可能的实现方式，和/或第一方面第四种可能的实现方式，和/或第一方面第五种可能的实现方式，和/或第一方面第六种可能的实现方式，和/或第一方面第七种可能的实现方式，和/或第一方面第八种可能的实现方式，在第一方面第九种可能的实现方式中，还包括：
所述核心网设备接收UE在连接态发送的所述UE的eDRX周期，根据所述eDRX周期计算所述UE的PF和PO；
当所述UE的下行数据到达且所述UE处于空闲态时，所述核心网设备在所述PF和PO指示的寻呼时刻之前向基站发送寻呼消息，以便所述基站将所述寻呼消息发送给所述UE。
结合第一方面第九种可能的实现方式，在第一方面第十种可能的实现方式中，所述核心网设备向基站发送寻呼消息的时刻，在计算所述PF和PO的时刻以及所述寻呼时刻之间更接近所述寻呼时刻。
结合第一方面，和/或第一方面第一种可能的实现方式，和/或第一方面第二种可能的实现方式，和/或第一方面第三种可能的实现方式，和/或第一方面第四 种可能的实现方式，和/或第一方面第五种可能的实现方式，和/或第一方面第六种可能的实现方式，和/或第一方面第七种可能的实现方式，和/或第一方面第八种可能的实现方式，在第一方面第十一种可能的实现方式中，还包括：
所述核心网设备接收UE在连接态发送的所述UE的eDRX周期；
当所述UE的下行数据到达且所述UE处于空闲态时，所述核心网设备向基站发送寻呼消息，所述寻呼消息中包括所述UE的eDRX周期；
所述核心网设备接收所述基站发送的第一时间间隔，所述第一时间间隔在所述基站根据所述eDRX周期计算所述UE的PF和PO、并确定所述UE的PF和PO指示的寻呼时刻距离当前时间的时间间隔大于预设时间阈值时发送；所述第一时间间隔小于等于所述UE的寻呼时刻距离所述当前时间的时间间隔；
所述核心网设备根据接收到的所述第一时间间隔向所述基站发送寻呼消息。
结合第一方面第十一种可能的实现方式，在第一方面第十二种可能的实现方式中，所述核心网设备根据接收到的所述第一时间间隔向所述基站发送寻呼消息，包括：
对于每个基站，所述核心网设备根据该基站发送的第一时间间隔，在该基站的第一时间间隔之后向该基站发送寻呼消息；或者，
所述核心网设备从各个基站发送的第一时间间隔中选择最小的第一时间间隔，在所述最小的第一时间间隔之后向各个基站发送寻呼消息。
结合第一方面第十一种可能的实现方式，在第一方面第十三种可能的实现方式中，所述核心网设备向基站发送寻呼消息，包括：
所述核心网设备确定所述UE从连接态转入空闲态之后未发送过UE的寻呼消息，即时向基站发送所述寻呼消息；或者，
所述核心网设备确定所述UE从连接态转入空闲态之后发送过UE的寻呼消息，根据最近一次发送所述UE的寻呼消息的时间与所述UE的eDRX周期确定本次发送寻呼消息的时间，在本次发送寻呼消息的时间到来时，向基站发送所述寻呼消息。
结合第一方面第十一种可能的实现方式，在第一方面第十四种可能的实现方式中，所述核心网设备向基站发送寻呼消息，包括：
所述核心网设备确定所述UE从连接态转入空闲态之后未发送过UE的寻呼消息，即时向基站发送所述寻呼消息；或者，
所述核心网设备确定所述UE从连接态转入空闲态之后发送过UE的寻呼消 息，根据预先存储的发送参考时间和参考时间间隔、与UE的eDRX周期确定本次发送寻呼消息的时间，在本次发送寻呼消息的时间到来时，核心网设备向基站发送所述寻呼消息。
结合第一方面第十四种可能的实现方式，在第一方面第十五种可能的实现方式中，还包括：
所述核心网设备在每次发送寻呼消息时，如果接收到基站发送的第一时间间隔，所述核心网设备使用该寻呼消息的发送时间更新所述发送参考时间，使用接收到的第一时间间隔更新所述参考时间间隔。
结合第一方面，和/或第一方面第一种可能的实现方式，和/或第一方面第二种可能的实现方式，和/或第一方面第三种可能的实现方式，和/或第一方面第四种可能的实现方式，和/或第一方面第五种可能的实现方式，和/或第一方面第六种可能的实现方式，和/或第一方面第七种可能的实现方式，和/或第一方面第八种可能的实现方式，在第一方面第十六种可能的实现方式中，还包括：
所述核心网设备接收UE在连接态发送的所述UE的eDRX周期；
当所述UE的下行数据到达且所述UE处于空闲态，且，所述核心网设备确定所述UE从连接态转入空闲态之后未发送过所述UE的寻呼消息时，所述核心网设备即时向基站发送寻呼消息；或者，当所述UE的下行数据到达且所述UE处于空闲态，且，所述核心网设备确定所述UE从连接态转入空闲态之后发送过所述UE的寻呼消息时，所述核心网设备根据最近一次发送所述UE的寻呼消息的时间、所述UE的eDRX周期以及所述最近一次发送UE的寻呼消息对应的第二时间间隔确定本次发送寻呼消息的时间，在本次发送寻呼消息的时间到来时，向基站发送寻呼消息；
最近一次发送UE的寻呼消息对应的第二时间间隔为：在核心网设备最近一次发送UE的寻呼消息时，各个基站对应反馈的寻呼响应消息中携带的第二时间间隔；
所述第二时间间隔用于向核心网设备指示基站计算的所述UE的寻呼时刻。
结合第一方面第十六种可能的实现方式，在第一方面第十七种可能的实现方式中，所述核心网设备根据最近一次发送所述UE的寻呼消息的时间、所述UE的eDRX周期以及所述最近一次发送UE的寻呼消息对应的第二时间间隔确定本次发送寻呼消息的时间，包括：
所述核心网设备从所述第二时间间隔中选择数值最小的第二时间间隔；
所述核心网设备根据以下公式确定本次发送寻呼消息的时间：
本次发送寻呼消息的时间＝最近一次发送UE的寻呼消息的时间+M*eDRX周期+所述数值最小的第二时间间隔；M为自然数。
第二方面，本发明实施例提供一种寻呼方法，包括：
基站接收核心网设备发送的基准帧信息，所述基准帧信息包括：无线帧号；
所述基站根据所述基准帧信息同步所述基站中的无线帧。
结合第二方面，在第二方面第一种可能的实现方式中，所述基站根据所述帧信息同步所述基站中的无线帧，包括：
所述基站根据绝对时间偏差与一个无线帧的长度计算得到绝对时间偏差包括的无线帧的数量以及剩余时间偏差；
所述基站根据剩余时间偏差和子帧长度计算得到剩余时间偏差包括的子帧的数量；
所述基站将初始的无线帧号加上无线帧的数量，得到当前无线帧的帧号，根据子帧的数量确定当前无线帧中当前子帧的子帧号。
结合第二方面，在第二方面第二种可能的实现方式中，所述基站根据所述帧信息同步所述基站中的无线帧，包括：
所述基站将所述基站中当前无线帧的帧号更新为所述基准帧信息中携带的所述无线帧号。
结合第二方面，在第二方面第三种可能的实现方式中，所述帧信息还包括：子帧号；所述基站根据所述帧信息同步所述基站中的无线帧，包括：
所述基站将所述基站中当前无线帧的帧号更新为所述基准帧信息中携带的所述无线帧号，将所述基站中当前无线帧的子帧号更新为所述基准帧信息中携带的所述子帧号。
结合第二方面，和/或第二方面第一种可能的实现方式，和/或第二方面第二种可能的实现方式，和/或第二方面第三种可能的实现方式，在第二方面第四种可能的实现方式中，该方法还包括：
所述基站向所述核心网设备发送所述基准帧信息的接收确认消息。
结合第二方面，和/或第二方面第一种可能的实现方式，和/或第二方面第二种可能的实现方式，和/或第二方面第三种可能的实现方式，在第二方面第五种可能的实现方式中，该方法还包括：
所述基站接收所述核心网设备发送的寻呼消息；
所述基站根据所述寻呼消息中携带的eDRX周期以及UE标识计算UE的PF和PO；
所述基站在所述UE的PF和PO指示的寻呼时刻发送所述UE的寻呼消息。
结合第二方面，和/或第二方面第一种可能的实现方式，和/或第二方面第二种可能的实现方式，和/或第二方面第三种可能的实现方式，在第二方面第六种可能的实现方式中，该方法还包括：
所述基站接收所述核心网设备发送的寻呼消息；
所述基站根据所述寻呼消息中携带的eDRX周期以及UE标识计算UE的PF和PO；
所述基站确定所述PF和PO指示的寻呼时刻距离当前时间的时间间隔大于预设时间阈值时，确定第一时间间隔，将确定的第一时间间隔发送给所述核心网设备；所述第一时间间隔小于等于寻呼时刻距离当前时间的时间间隔；
所述基站接收所述核心网设备根据所述第一时间间隔发送的所述UE的寻呼消息。
结合第二方面第六种可能的实现方式，在第二方面第七种可能的实现方式中，所述基站将确定的第一时间间隔发送给所述核心网设备之前，还包括：
所述基站从接收到的所述寻呼消息中获取推荐小区列表，确定所述基站自身是所述推荐小区列表中所列小区的基站；或者，
所述基站从接收到的所述寻呼消息中获取推荐基站列表，确定所述基站自身是所述推荐小区列表中所列基站。
结合第二方面，和/或第二方面第一种可能的实现方式，和/或第二方面第二种可能的实现方式，和/或第二方面第三种可能的实现方式，在第二方面第八种可能的实现方式中，还包括：
所述基站接收所述核心网设备发送的寻呼消息；
所述基站根据所述寻呼消息中携带的eDRX周期以及UE标识计算UE的PF和PO；
所述基站根据所述PF和PO指示的寻呼时刻距离当前时间的时间间隔确定第二时间间隔，将所述第二时间间隔携带在寻呼响应消息中发送给所述核心网设备；所述第二时间间隔用于向所述核心网设备指示所述PF和PO指示的寻呼时刻。
结合第二方面，和/或第二方面第一种可能的实现方式，和/或第二方面第二 种可能的实现方式，和/或第二方面第三种可能的实现方式，和/或第二方面第四种可能的实现方式，和/或第二方面第五种可能的实现方式，和/或第二方面第六种可能的实现方式，和/或第二方面第七种可能的实现方式，和/或第二方面第八种可能的实现方式，在第二方面第九种可能的实现方式中，所述基站接收核心网设备发送的帧信息之前，还包括：
所述基站判断当前时刻距离上一次接收到所述基准帧信息的时刻超过预设周期值时，向所述核心网设备发送同步请求消息，所述同步请求消息用于请求所述核心网设备发送当前的帧信息。
第三方面，提供一种寻呼方法，包括：
用户设备进入空闲态时，计算所述用户设备的PF和PO；
所述用户设备在所述PF和PO指示的寻呼时刻之前的第一时刻醒来，确定所述用户设备是否进行小区重选；所述第一时刻与所述寻呼时刻之间的时间间隔大于等于所述用户设备完成一次小区重选的时间；
如果进行小区重选，完成小区重选后，在重选小区的寻呼信道上监听寻呼消息；
如果不进行小区重选，在当前小区的寻呼信道上监听寻呼消息或进入睡眠状态直到寻呼时刻醒来在当前小区的寻呼信道上监听寻呼消息。
结合第三方面，在第三方面第一种可能的实现方式中，所述第一时刻与所述寻呼时刻之间的时间间隔大于等于所述用户设备完成一次小区重选的时间与一个无线帧的时长之和。
第四方面，本发明实施例提供一种核心网设备，包括：
处理器，用于确定同步时机到来时，所述核心网设备确定基准帧信息，所述基准帧信息包括：无线帧号；
发送器，用于向寻呼区中的基站发送所述处理器确定的所述基准帧信息，以便所述基站根据所述基准帧信息同步所述基站中的无线帧。
结合第四方面，在第四方面第一种可能的实现方式中，所述处理器具体用于：
确定所述寻呼区中有新基站连接至所述核心网设备；或者，
确定所述寻呼区中有基站重启后重新连接至所述核心网设备；或者，
确定到达每个同步周期的同步时刻；或者，
接收到所述寻呼区中的至少一个基站发送的同步请求消息。
结合第四方面，和/或第四方面第一种可能的实现方式，在第四方面第二种 可能的实现方式中，所述处理器具体用于：
预先存储初始的无线帧号；
计算当前时间与初始时刻之间的绝对时间偏差，所述初始时刻是所述无线帧号指示的无线帧的初始时刻；
将所述绝对时间偏差和所述初始的无线帧号确定为基准帧信息。
结合第四方面，和/或第四方面第一种可能的实现方式，在第四方面第三种可能的实现方式中，所述处理器具体用于：
预先存储初始的无线帧号；
根据无线帧的时长持续将存储的所述无线帧号更新为所述核心网设备当前无线帧的帧号；
读取所述核心网设备存储的无线帧号。
结合第四方面，和/或第四方面第一种可能的实现方式，在第四方面第四种可能的实现方式中，所述帧信息还包括：子帧号；所述处理器具体用于：
预先存储初始的无线帧号和子帧号；
根据系统寻呼帧和子帧的时长持续将存储的所述无线帧号更新为当前无线帧的帧号、将存储的所述子帧号更新为当前无线帧中当前子帧的子帧号；
读取所述核心网设备存储的无线帧号和子帧号。
结合第四方面，和/或第四方面第一种可能的实现方式，在第四方面第五种可能的实现方式中，还包括：
接收器，用于接收第一基站发送的所述第一基站的帧信息，所述帧信息包括：所述第一基站发送所述帧信息时所述第一基站的无线帧号；所述第一基站是寻呼区中的基站；
所述处理器还用于：将所述第一基站的帧信息确定为所述基准帧信息。
结合第四方面，和/或第四方面第一种可能的实现方式，在第四方面第六种可能的实现方式中，还包括：
接收器，用于接收第一基站发送的所述第一基站的帧信息，所述帧信息包括：所述第一基站发送所述帧信息时所述第一基站的无线帧号和子帧号；所述第一基站是寻呼区中的基站；
所述处理器还用于：将所述第一基站的帧信息确定为所述基准帧信息。
结合第四方面第五种可能的实现方式，和/或第四方面第六种可能的实现方式，在第四方面第七种可能的实现方式中，所述发送器还用于：在所述接收器接 收所述第一基站的帧信息之前，向所述第一基站发送帧信息请求。
结合第四方面，和/或第四方面第一种可能的实现方式，和/或第四方面第二种可能的实现方式，和/或第四方面第三种可能的实现方式，和/或第四方面第四种可能的实现方式，和/或第四方面第五种可能的实现方式，和/或第四方面第六种可能的实现方式，和/或第四方面第七种可能的实现方式，在第四方面第八种可能的实现方式中，还包括：
接收器，用于接收所述基站在接收到所述帧信息后发送的接收确认消息。
结合第四方面，和/或第四方面第一种可能的实现方式，和/或第四方面第二种可能的实现方式，和/或第四方面第三种可能的实现方式，和/或第四方面第四种可能的实现方式，和/或第四方面第五种可能的实现方式，和/或第四方面第六种可能的实现方式，和/或第四方面第七种可能的实现方式，和/或第四方面第八种可能的实现方式，在第四方面第九种可能的实现方式中，还包括：
接收器，用于接收UE在连接态发送的所述UE的eDRX周期；
所述处理器还用于：根据所述eDRX周期计算所述UE的PF和PO；
所述发送器还用于：当所述UE的下行数据到达且所述UE处于空闲态时，在所述PF和PO指示的寻呼时刻之前向基站发送寻呼消息，以便所述基站将所述寻呼消息发送给所述UE。
结合第四方面第九种可能的实现方式，在第四方面第十种可能的实现方式中，所述核心网设备向基站发送寻呼消息的时刻，在计算所述PF和PO的时刻以及所述寻呼时刻之间更接近所述寻呼时刻。
结合第四方面，和/或第四方面第一种可能的实现方式，和/或第四方面第二种可能的实现方式，和/或第四方面第三种可能的实现方式，和/或第四方面第四种可能的实现方式，和/或第四方面第五种可能的实现方式，和/或第四方面第六种可能的实现方式，和/或第四方面第七种可能的实现方式，和/或第四方面第八种可能的实现方式，在第四方面第十一种可能的实现方式中，还包括：
接收器，用于接收UE在连接态发送的所述UE的eDRX周期；
发送器，用于当所述UE的下行数据到达且所述UE处于空闲态时，向基站发送寻呼消息，所述寻呼消息中包括所述UE的eDRX周期；
所述接收器还用于：接收所述基站发送的第一时间间隔，所述第一时间间隔在所述基站根据所述eDRX周期计算所述UE的PF和PO、并确定所述UE的PF和PO指示的寻呼时刻距离当前时间的时间间隔大于预设时间阈值时发送；所述 第一时间间隔小于等于所述UE的寻呼时刻距离所述当前时间的时间间隔；
所述发送器还用于：根据接收到的所述第一时间间隔向所述基站发送寻呼消息。
结合第四方面第十一种可能的实现方式，在第四方面第十二种可能的实现方式中，所述发送器具体用于：对于每个基站，根据该基站发送的第一时间间隔，在该基站的第一时间间隔之后向该基站发送寻呼消息；或者，
从各个基站发送的第一时间间隔中选择最小的第一时间间隔，在所述最小的第一时间间隔之后向各个基站发送寻呼消息。
结合第四方面第十一种可能的实现方式，在第四方面第十三种可能的实现方式中，所述发送器具体用于：
确定所述UE从连接态转入空闲态之后未发送过UE的寻呼消息，即时向基站发送所述寻呼消息；或者，
确定所述UE从连接态转入空闲态之后发送过UE的寻呼消息，根据最近一次发送所述UE的寻呼消息的时间与所述UE的eDRX周期确定本次发送寻呼消息的时间，在本次发送寻呼消息的时间到来时，向基站发送所述寻呼消息。
结合第四方面第十一种可能的实现方式，在第四方面第十四种可能的实现方式中，所述发送器具体用于：
确定所述UE从连接态转入空闲态之后未发送过UE的寻呼消息，即时向基站发送所述寻呼消息；或者，
确定所述UE从连接态转入空闲态之后发送过UE的寻呼消息，根据预先存储的发送参考时间和参考时间间隔、与UE的eDRX周期确定本次发送寻呼消息的时间，在本次发送寻呼消息的时间到来时，核心网设备向基站发送所述寻呼消息。
结合第四方面第十四种可能的实现方式，在第四方面第十五种可能的实现方式中，所述处理器还用于：
在每次发送寻呼消息时，如果接收到基站发送的第一时间间隔，使用该寻呼消息的发送时间更新所述发送参考时间，使用接收到的第一时间间隔更新所述参考时间间隔。
结合第四方面，和/或第四方面第一种可能的实现方式，和/或第四方面第二种可能的实现方式，和/或第四方面第三种可能的实现方式，和/或第四方面第四种可能的实现方式，和/或第四方面第五种可能的实现方式，和/或第四方面第六 种可能的实现方式，和/或第四方面第七种可能的实现方式，和/或第四方面第八种可能的实现方式，在第四方面第十六种可能的实现方式中，还包括：
接收器，用于接收UE在连接态发送的所述UE的eDRX周期；
所述处理器还用于：当所述UE的下行数据到达且所述UE处于空闲态，且，确定所述UE从连接态转入空闲态之后发送过所述UE的寻呼消息时，根据最近一次发送所述UE的寻呼消息的时间、所述UE的eDRX周期以及所述最近一次发送UE的寻呼消息对应的第二时间间隔确定本次发送寻呼消息的时间；
所述发送器还用于：当所述UE的下行数据到达且所述UE处于空闲态，且，确定所述UE从连接态转入空闲态之后未发送过所述UE的寻呼消息时，即时向基站发送寻呼消息；或者，当所述UE的下行数据到达且所述UE处于空闲态，且，确定所述UE从连接态转入空闲态之后发送过所述UE的寻呼消息时，在本次发送寻呼消息的时间到来时，向基站发送寻呼消息；
最近一次发送UE的寻呼消息对应的第二时间间隔为：在核心网设备最近一次发送UE的寻呼消息时，各个基站对应反馈的寻呼响应消息中携带的第二时间间隔；
所述第二时间间隔用于向核心网设备指示基站计算的所述UE的寻呼时刻。
结合第四方面第十六种可能的实现方式，在第四方面第十七种可能的实现方式中，所述处理器具体用于：从所述第二时间间隔中选择数值最小的第二时间间隔；
根据以下公式确定本次发送寻呼消息的时间：
本次发送寻呼消息的时间＝最近一次发送UE的寻呼消息的时间+M*eDRX周期+所述数值最小的第二时间间隔；M为自然数。
第五方面，本发明实施例提供一种基站，包括：
接收器，用于接收核心网设备发送的基准帧信息，所述基准帧信息包括：无线帧号；
处理器，用于根据所述接收器接收的所述基准帧信息同步所述基站中的无线帧。
结合第五方面，在第五方面第一种可能的实现方式中，所述处理器具体用于：
根据绝对时间偏差与一个无线帧的长度计算得到绝对时间偏差包括的无线帧的数量以及剩余时间偏差；
根据剩余时间偏差和子帧长度计算得到剩余时间偏差包括的子帧的数量；
将初始的无线帧号加上无线帧的数量，得到当前无线帧的帧号，根据子帧的数量确定当前无线帧中当前子帧的子帧号。
结合第五方面，在第五方面第二种可能的实现方式中，所述处理器具体用于：
将所述基站中当前无线帧的帧号更新为所述基准帧信息中携带的所述无线帧号。
结合第五方面，在第五方面第三种可能的实现方式中，所述帧信息还包括：子帧号；所述处理器具体用于：
将所述基站中当前无线帧的帧号更新为所述基准帧信息中携带的所述无线帧号，将所述基站中当前无线帧的子帧号更新为所述基准帧信息中携带的所述子帧号。
结合第五方面，和/或第五方面第一种可能的实现方式，和/或第五方面第二种可能的实现方式，和/或第五方面第三种可能的实现方式，在第五方面第四种可能的实现方式中，该基站还包括：
发送器，用于向所述核心网设备发送所述基准帧信息的接收确认消息。
结合第五方面，和/或第五方面第一种可能的实现方式，和/或第五方面第二种可能的实现方式，和/或第五方面第三种可能的实现方式，在第五方面第五种可能的实现方式中，该基站还包括：
所述接收器还用于：接收所述核心网设备发送的寻呼消息；
所述处理器还用于：根据所述寻呼消息中携带的eDRX周期以及UE标识计算UE的PF和PO；
所述发送器还用于：在所述UE的PF和PO指示的寻呼时刻发送所述UE的寻呼消息。
结合第五方面，和/或第五方面第一种可能的实现方式，和/或第五方面第二种可能的实现方式，和/或第五方面第三种可能的实现方式，在第五方面第六种可能的实现方式中，该基站还包括：
所述接收器还用于：接收所述核心网设备发送的寻呼消息；
所述处理器还用于：根据所述寻呼消息中携带的eDRX周期以及UE标识计算UE的PF和PO；确定所述PF和PO指示的寻呼时刻距离当前时间的时间间隔大于预设时间阈值时，确定第一时间间隔；
所述发送器还用于：将确定的第一时间间隔发送给所述核心网设备；所述第一时间间隔小于等于寻呼时刻距离当前时间的时间间隔；
所述接收器还用于：接收所述核心网设备根据所述第一时间间隔发送的所述UE的寻呼消息。
结合第五方面第六种可能的实现方式，在第五方面第七种可能的实现方式中，所述处理器还用于：
从所述接收器接收到的所述寻呼消息中获取推荐小区列表，确定所述基站自身是所述推荐小区列表中所列小区的基站；或者，
从所述接收器接收到的所述寻呼消息中获取推荐基站列表，确定所述基站自身是所述推荐小区列表中所列基站。
结合第五方面，和/或第五方面第一种可能的实现方式，和/或第五方面第二种可能的实现方式，和/或第五方面第三种可能的实现方式，在第五方面第八种可能的实现方式中，还包括：
所述接收器还用于：接收所述核心网设备发送的寻呼消息；
所述处理器还用于：根据所述寻呼消息中携带的eDRX周期以及UE标识计算UE的PF和PO；根据所述PF和PO指示的寻呼时刻距离当前时间的时间间隔确定第二时间间隔；
还包括：发送器，用于将所述第二时间间隔携带在寻呼响应消息中发送给所述核心网设备；所述第二时间间隔用于向所述核心网设备指示所述PF和PO指示的寻呼时刻。
结合第五方面，和/或第五方面第一种可能的实现方式，和/或第五方面第二种可能的实现方式，和/或第五方面第三种可能的实现方式，和/或第五方面第四种可能的实现方式，和/或第五方面第五种可能的实现方式，和/或第五方面第六种可能的实现方式，和/或第五方面第七种可能的实现方式，和/或第五方面第八种可能的实现方式，在第五方面第九种可能的实现方式中，所述发送器还用于：所述处理器判断当前时刻距离上一次接收到所述基准帧信息的时刻超过预设周期值时，向所述核心网设备发送同步请求消息，所述同步请求消息用于请求所述核心网设备发送当前的帧信息。
第六方面，本发明实施例提供一种用户设备，包括：
处理器，用于进入空闲态时，计算所述用户设备的PF和PO；在所述PF和PO指示的寻呼时刻之前的第一时刻醒来，确定所述用户设备是否进行小区重选；所述第一时刻与所述寻呼时刻之间的时间间隔大于等于所述用户设备完成一次小区重选的时间；如果进行小区重选，完成小区重选；
接收器，用于所述处理器确定进行小区重选时，在重选小区的寻呼信道上监听寻呼消息；所述处理器确定不进行小区重选时，在当前小区的寻呼信道上监听寻呼消息或进入睡眠状态直到寻呼时刻醒来在当前小区的寻呼信道上监听寻呼消息。
结合第六方面，在第六方面第一种可能的实现方式中，所述第一时刻与所述寻呼时刻之间的时间间隔大于等于所述用户设备完成一次小区重选的时间与一个无线帧的时长之和。
本发明实施例中，核心网设备确定同步时机到来时，所述核心网设备确定基准帧信息，所述基准帧信息包括：无线帧号，向寻呼区中的基站发送所述基准帧信息，以便所述基站根据所述基准帧信息同步所述基站中的无线帧，从而使得核心网设备与基站之间至少无线帧号同步，将核心网设备与基站之间的时间差限制在无线帧的时长之内，从而尽量缩小不同基站的小区之间的时间误差，从而能够在一定程度上减少UE虽然在当前小区的寻呼时刻之前完成小区重选仍然错过新小区的寻呼时刻的问题的发生。
附图说明
为了更清楚地说明本发明实施例的技术方案，下面将对实施例描述中所需要使用的附图作简单地介绍，显而易见地，对于本领域普通技术人员而言，在不付出创造性劳动性的前提下，还可以根据这些附图获得其他的附图。
图1为本发明实施例应用场景举例；
图2为本发明实施例寻呼方法流程示意图；
图3为本发明实施例寻呼方法另一流程示意图；
图4为本发明实施例寻呼方法另一流程示意图；
图5为本发明实施例寻呼方法另一流程示意图；
图6为本发明实施例寻呼方法另一流程示意图；
图7为本发明实施例寻呼方法另一流程示意图；
图8为本发明实施例核心网设备结构示意图；
图9为本发明实施例基站结构示意图；
图10为本发明实施例用户设备结构示意图。
具体实施方式
发明人发现，导致UE发生小区重选错过重选前后两个小区的寻呼时刻的原因之一在于：基站之间的时间不同步，从而虽然不同基站计算得到的同一UE的PSF和PO相同，但是由于基站之间时间不同步，所以相同的PSF和PO指示的寻呼时刻在不同的基站其对应的绝对时间可能是不同的，例如假设UE1的PSF1和PO1指示寻呼时刻1，UE1当前位于基站A的小区a，重选到基站B的小区b，基站A的小区中该UE1的寻呼时刻1在绝对时间t1到来，基站B的小区中该UE1的寻呼时刻1在绝对时间t2到来；如果t2<t1，即便UE在小区a的寻呼时刻1到来之前开始进行小区重选至小区b，且UE在完成重选时的时间早于t1，但是只要该时间晚于t2，UE就会错过小区b的寻呼时刻1，从而UE1需要等待小区b在下一个eDRX周期中的寻呼时刻，进而如果UE1移动频繁，重复发生上述情况，则UE1将长时间无法监听到寻呼消息，进而无法接收到核心网希望下发的数据。
为此，本发明实施例提供了一种寻呼方法，以减少上述情况下UE无法监听到寻呼消息问题的发生。
为了使本技术领域的人员更好地理解本发明实施例中的技术方案，并使本发明实施例的上述目的、特征和优点能够更加明显易懂，下面结合附图对本发明实施例中技术方案作进一步详细的说明。
本发明实施例所述寻呼方法可以应用于M2M、LTE等通信系统满足以下条件的寻呼场景中：采用eDRX方式且UE具有一定移动性。例如，参见图1为本发明实施例寻呼方法所应用的一种网络结构举例。其中包括：核心网设备110、基站120、各基站120包括的小区130、以及UE140。其中，UE140处于小区130中的某一个小区中，UE140具有一定的移动性，可以移动至其他小区中。
其中，本发明实施例应用于M2M时，本发明实施例中所述的无线帧是M2M中的超帧，所述的子帧是超帧的帧，核心网设备可以为服务GPRS支持节点)(SGSN，Service GPRS Support Node)；本发明实施例应用于LTE时，本发明实施例中所述的无线帧是LTE中的帧，所述的子帧是LTE中的子帧，核心网设备可以为移动性管理实体(MME，Mobility Management Entity)。M2M中的寻呼超帧和LTE中的寻呼帧等存在PO的无线帧在本发明实施例中称为寻呼无线帧(PF，Paging Frame)，PF是存在PO的无线帧，PO是无线帧中存在寻呼消息的子帧，一个PF中可能包括一个或多个PO。
参见图2，为本发明实施例寻呼方法的一种流程示意图，该方法包括：
步骤201：核心网设备确定同步时机到来时，所述核心网设备确定基准帧信息，所述基准帧信息包括：无线帧号。
其中，所述核心网设备确定同步时机到来可以包括：
所述核心网设备确定所述寻呼区中有新基站连接至所述核心网设备；或者，
所述核心网设备确定所述寻呼区中有基站重启后重新连接至所述核心网设备；或者，
所述核心网设备确定到达每个同步周期的同步时刻；或者，
所述核心网设备接收到所述寻呼区中的至少一个基站发送的同步请求消息。
其中，所述同步周期的具体周期长度本发明实施例不限制，每个同步周期中的同步时刻本发明实施例并不限制，只要核心网设备发送基准帧信息即可。
本步骤中，核心网设备确定基准帧信息，可以包括：
核心网设备预先存储初始的无线帧号；
核心网设备计算当前时间与初始时刻之间的绝对时间偏差，所述初始时刻是所述无线帧号指示的无线帧的初始时刻；
核心网设备将所述绝对时间偏差和所述初始的无线帧号确定为基准帧信息。
本步骤中，核心网设备确定基准帧信息可以包括：所述核心网设备预先存储初始的无线帧号；所述核心网设备根据无线帧的时长持续将存储的所述无线帧号更新为所述核心网设备当前无线帧的帧号；所述核心网设备读取所述核心网设备存储的无线帧号。
例如，假设核心网设备预先存储的初始的无线帧号为0，初始时刻为0，无线帧的时长为T，则时间T时，当前无线帧的帧号为1，用该帧号1更新存储的无线帧号0，时间2T时，当前无线帧的帧号为2，用该帧号2更新存储的无线帧号1，以此类推，实现存储的无线帧号的实时更新，保证存储的无线帧号始终是当前无线帧的帧号。
其中，所述基准帧信息还可以包括：子帧号；此时，所述核心网设备确定基准帧信息，可以包括：所述核心网设备预先存储初始的无线帧号和子帧号；所述核心网设备根据系统寻呼帧和子帧的时长持续将存储的所述无线帧号更新为当前无线帧的帧号、将存储的所述子帧号更新为当前无线帧中当前子帧的子帧号；所述核心网设备读取所述核心网设备存储的无线帧号和子帧号。
例如，假设核心网设备预先存储的初始的无线帧号为0、子帧号为0，初始 时刻为0，无线帧的时长为T，每个无线帧有64个子帧，则时间T/64时，当前无线帧的帧号为0，子帧号为1，用该帧号0、子帧号1更新存储的无线帧号0、子帧号0，时间T/32时，当前无线帧的帧号为0，子帧号为2，用该帧号0、子帧号2更新存储的无线帧号0、子帧号1，以此类推，实现存储的无线帧号和子帧号的实时更新，保证存储的无线帧号和子帧号始终是当前无线帧的帧号以及当前无线帧的当前子帧的子帧号。
以上描述中，是核心网设备自己维护核心网设备当前的帧信息，以维护的帧信息作为基准帧信息；核心网设备也可以自己不维护当前的帧信息，而是从寻呼区中的某个基站获取基站当前的帧信息，作为基准帧信息。
例如，所述核心网设备确定基准帧信息，可以包括：
所述核心网设备接收第一基站发送的所述第一基站的帧信息，将所述第一基站的帧信息确定为所述基准帧信息；所述帧信息包括：所述第一基站发送所述帧信息时所述第一基站的无线帧号；所述第一基站是寻呼区中的基站。
或者，所述核心网设备确定基准帧信息，可以包括：
所述核心网设备接收第一基站发送的所述第一基站的帧信息，将所述第一基站的帧信息确定为所述基准帧信息；
所述帧信息包括：所述第一基站发送所述帧信息时所述第一基站的无线帧号和子帧号；所述第一基站是寻呼区中的基站。
以上两个实例是第一基站可以主动向核心网设备发送第一基站的帧信息，在实际应用中，第一基站也可以在核心网设备请求时，向核心网设备发送第一基站的帧信息，此时，
所述核心网设备确定基准帧信息，可以包括：
所述核心网设备向所述第一基站发送帧信息请求；
所述核心网设备接收第一基站发送的所述第一基站的帧信息，将所述第一基站的帧信息确定为所述基准帧信息；所述帧信息包括：所述第一基站发送所述帧信息时所述第一基站的无线帧号；所述第一基站是寻呼区中的基站。
或者，所述核心网设备确定基准帧信息，可以包括：
所述核心网设备向所述第一基站发送帧信息请求；
所述核心网设备接收第一基站发送的所述第一基站的帧信息，将所述第一基站的帧信息确定为所述基准帧信息；
所述帧信息包括：所述第一基站发送所述帧信息时所述第一基站的无线帧号 和子帧号；所述第一基站是寻呼区中的基站。
步骤202：所述核心网设备向寻呼区中的基站发送所述基准帧信息，以便所述基站根据所述基准帧信息同步所述基站中的无线帧。
其中，本步骤中核心网设备可以向寻呼区中所有基站发送所述基准帧信息，也可以向寻呼区中的某一个或某几个基站发送所述基准帧信息，具体可以在实际应用中自主设定，这里并不限制。例如，当核心网设备的同步时机为新基站连接至所述核心网设备时，核心网设备可以仅向新基站发送所述基准帧信息，也可以向寻呼区中所有基站发送基准帧信息；或者，核心网设备的同步时机为接收到某个基站的同步请求消息时，本步骤中核心网设备可以仅向发送同步请求消息的基站发送基准帧信息，也可以向寻呼区中的所有基站发送基准帧信息。
本实施例中，核心网设备向基站发送核心网设备当前的基准帧信息，基准帧信息包括：无线帧号，以便基站根据所述基准帧信息更新基站中的无线帧，从而使得核心网设备与基站之间至少无线帧号同步，将核心网设备与基站之间的时间差限制在无线帧的时长之内，从而尽量缩小不同基站的小区之间的时间误差，从而能够在一定程度上减少UE虽然在当前小区的寻呼时刻之前完成小区重选仍然错过新小区的寻呼时刻的问题的发生。
参见图3，为本发明实施例寻呼方法的另一种流程示意图，该方法包括：
步骤301：基站接收核心网设备发送的基准帧信息，所述帧信息包括：无线帧号；
步骤302：基站根据所述基准帧信息同步所述基站中的无线帧。
其中，所述基站根据所述基准帧信息同步所述基站中的无线帧，可以包括：
所述基站将所述基站中当前无线帧的帧号更新为所述基准帧信息中携带的所述无线帧号。
其中，所述帧信息还可以包括：子帧号，相应的，所述基站根据所述基准帧信息同步所述基站中的无线帧，可以包括：
所述基站将所述基站中当前无线帧的帧号更新为所述基准帧信息中携带的所述无线帧号，将所述基站中当前无线帧的子帧号更新为所述基准帧信息中携带的所述子帧号。
其中，所述帧信息还可以包括：当前时间与初始时刻之间的绝对时间偏差，相应的，所述基站根据所述基准帧信息同步所述基站中的无线帧，可以包括：
所述基站根据绝对时间偏差和初始的无线帧号确定当前无线帧的帧号和当前无线帧中当前子帧的子帧号。
具体的，基站可以根据绝对时间偏差与无线帧的长度计算得到绝对时间偏差包括的无线帧的数量以及剩余时间偏差，根据剩余时间偏差和子帧长度计算得到剩余时间偏差包括的子帧的数量；
将初始的无线帧号加上无线帧的数量，得到当前无线帧的帧号；根据子帧的数量确定当前无线帧中当前子帧的子帧号。
例如，初始的无线帧号为1，绝对时间长度/一个无线帧的长度＝5，余数为x，x/一个子帧的长度＝3，则当前无线帧的帧号为1+5＝6，子帧的子帧号如果从0开始计数，则当前子帧的子帧号为2；如果x除以一个子帧的长度无法整除，得到的子帧的数量可以向上取整、向下取整、或者四舍五入，得到子帧的数量，例如x/一个子帧的长度＝3.4,则子帧号可以向上取整为4，或者向下取整为3，也可以四舍五入为3。
或者，基站可以将绝对时间偏差与无线帧的长度相除向上取整得到无线帧的数量，将初始的无线帧号加上无线帧的数量，得到当前无线帧的帧号；将当前无线帧中当前子帧的子帧号确定为0。
例如，绝对时间长度/一个无线帧的长度＝5.x，向上取整得到无线帧的数量为6，假设初始的无线帧号是0，则当前无线帧的帧号为6，子帧号为0。
本实施例中，基站接收核心网设备发送的基准帧信息，所述基准帧信息包括：无线帧号，根据所述基准帧信息同步所述基站中的无线帧，从而使得核心网设备与基站之间至少无线帧号同步，将核心网设备与基站之间的时间差限制在无线帧的时长之内，从而尽量缩小不同基站的小区之间的时间误差，从而能够在一定程度上减少UE虽然在当前小区的寻呼时刻之前完成小区重选仍然错过新小区的寻呼时刻的问题的发生。
参见图4，为本发明实施例寻呼方法的另一种流程示意图，该方法包括：
步骤401：UE进入空闲态时，计算所述UE的寻呼无线帧(PF，Paging Frame)和PO；
步骤402：所述UE在所述PF和PO指示的寻呼时刻之前的第一时刻醒来，确定所述UE是否进行小区重选；所述第一时刻与所述寻呼时刻之间的时间间隔大于等于所述UE完成一次小区重选的时间；
其中，所述小区重选的时间一般决定于小区重选过程中进行邻区测量时间。
步骤403：如果进行小区重选，完成小区重选后，在重选小区的寻呼信道上监听寻呼消息。
步骤404：如果不进行小区重选，在当前小区的寻呼信道上监听寻呼消息，或进入睡眠状态直到寻呼时刻之前醒来在当前小区的寻呼信道上监听寻呼信道。
本实施例中，UE进入空闲态时，计算PF和PO，在所述PF和PO指示的寻呼时刻之前的第一时刻醒来，确定所述UE是否进行小区重选；所述第一时刻与所述寻呼时刻之间的时间间隔大于等于所述UE完成一次小区重选的时间；如果进行小区重选，完成小区重选后，在重选小区的寻呼信道上监听寻呼消息；
如果不进行小区重选，在当前小区的寻呼信道上监听寻呼消息，或进入睡眠状态直到寻呼时刻之前醒来在当前小区的寻呼信道上监听寻呼信道。从而尽量保证UE在当前小区的寻呼时刻之前完成小区重选，与前述核心网设备与基站之间至少无线帧号同步相结合，在一定程度上减少UE虽然在当前小区的寻呼时刻之前完成小区重选仍然错过新小区的寻呼时刻的问题的发生。
参见图5，为本发明实施例寻呼方法一种流程示意图；该方法包括：
步骤501：在每个同步时机到来时，核心网设备确定基准帧信息，所述基准帧信息包括：无线帧号和子帧号，向基站发送所述基准帧信息。
其中，同步时机可以包括：所述寻呼区中有新基站连接至所述核心网设备；或者，所述寻呼区中有基站重启后重新连接至所述核心网设备；或者，到达每个同步周期的同步时刻；或者，所述核心网设备接收到所述寻呼区中的至少一个基站发送的同步请求消息。
其中，核心网设备可以通过设置同步定时器的方式来确定同步周期的同步时刻到来，具体的，同步定时器的时长等于同步周期时长，具体同步周期时长本发明实施例并不限制，同步定时器超时时，同步时刻到来，触发步骤501，核心网设备在发送基准帧信息后重置同步定时器。
其中，核心网设备可以通过一条新定义的S1口消息发送所述基准帧信息，也可以在现有的消息中通过新增加的IE携带所述基准帧信息。如果在现有的消息中增加IE，所述消息可以是核心网设备发送给基站的信令消息或数据消息，本发明实施例并不限制；另外，可以在现有消息预留的一个比特位中指示此条消息是否携带帧信息，若携带，则在消息的某个部分添加此IE。
另外，还可以在携带所述基准帧信息的消息中指示基站是否需要向SGSN反馈接收确认消息。
此时，所述同步时机还可以包括：步骤504中核心网设备在预设时间内没有接收到某一个或某几个基站发送的接收确认消息。
其中，所述同步请求消息可以是：基站在判断当前时刻距离上一次接收到所述帧信息的时刻超过预设周期值时，向所述核心网设备发送同步请求消息，所述同步请求消息用于请求所述核心网设备发送基准帧信息。这里的当前时刻是指基站执行该判断步骤的时刻。其中，基站可以在每次接收到所述帧信息的时刻启动一个同步定时器，同步定时器的时长为所述预设周期值，同步定时器超时未接收到新的帧信息则基站判断当前时刻距离上一次接收到所述帧信息的时刻超过预设周期值。
其中，核心网设备确定基准帧信息的方法可以参考步骤201中的相关描述，这里不再赘述。
步骤502：基站接收所述基准帧信息，将基站中当前无线帧的帧号更新为所述基准帧信息中携带的所述无线帧号，将所述基站中当前无线帧的子帧号更新为所述基准帧信息中携带的所述子帧号。
步骤503：基站向核心网设备发送所述基准帧信息的接收确认消息，核心网设备在预设时间内接收各个基站发送的接收确认消息。
其中，所述接收确认消息可以是新定义的S1口消息，也可以通过在现有基站发送给核心网设备的控制消息或数据消息中增加携带该接收确认消息的IE实现。
其中，基站发送该接收确认消息，可以是基站和核心网设备之间预先协商设定，也可以由核心网设备通过携带所述帧信息的消息指示给基站。
其中，可以设定如果核心网设备在预设时间内没有接收到某一个或某几个基站发送的接收确认消息，重新触发执行步骤501直到预设的最大发送次数或者接收到基站发送的接收确认消息。
本步骤为可选步骤。
步骤504：UE在连接态向核心网设备发送所述UE的eDRX周期。
步骤505：核心网设备根据所述eDRX周期计算所述UE的PF和PO。
其中，核心网设备可以根据eDRX周期以及UE标识来计算UE的PF和PO。
其中，如果步骤504中eDRX周期是由UE发送至基站，再由基站转发给核 心网设备，则UE标识可以由基站再转发eDRX周期时携带UE标识；
如果步骤504中eDRX周期是UE发送并由基站透传给核心网设备，UE在发送eDRX周期时可以携带UE标识。
步骤506：当所述UE的下行数据到达且所述UE处于空闲态时，核心网设备在所述PF和PO指示的寻呼时刻之前向基站发送寻呼消息，寻呼消息中包括UE的eDRX周期以及UE标识。
其中，核心网设备向基站发送寻呼消息的时刻，在计算所述PF和PO的时刻以及所述寻呼时刻之间最好更接近所述寻呼时刻。
其中，步骤504～步骤506是由核心网设备计算UE的PF和PO，存储寻呼消息至PF和PO指示的寻呼时刻之前发送；在实际应用中核心网也可以不计算UE的PF和PO，此时，步骤504～步骤506还可以通过以下步骤替代：
步骤a：所述核心网设备接收UE在连接态发送的所述UE的eDRX周期。
核心网设备可以将UE的eDRX周期保存在核心网设备中。
步骤b：当所述UE的下行数据到达且所述UE处于空闲态时，所述核心网设备向基站发送寻呼消息，所述寻呼消息中包括所述UE的eDRX周期。
其中，核心网设备向基站发送寻呼消息可以包括：
核心网设备判断在所述UE从连接态转入空闲态之后是否发送过UE的寻呼消息；
如果核心网设备在所述UE从连接态转入空闲态之后未发送过UE的寻呼消息，所述核心网设备直接向基站发送所述寻呼消息；
如果核心网设备在所述UE从连接态转入空闲态之后发送过UE的寻呼消息，核心网设备根据最近一次发送寻呼消息的时间与UE的eDRX周期确定本次发送寻呼消息的时间，在本次发送寻呼消息的时间到来时，核心网设备向基站发送所述寻呼消息。
例如，在所述UE从连接态转入空闲态之后核心网设备向各个基站发送过UE的寻呼消息1，本次要发送的寻呼消息是寻呼消息2，寻呼消息1和寻呼消息2是不同的寻呼消息而不是同一寻呼消息的副本；
则本步骤中，核心网设备判断在UE从连接态转入空闲态之后发送过UE的寻呼消息1，核心网设备根据最近一次发送寻呼消息1的时间以及UE的eDRX周期按照公式最近一次发送寻呼消息1的时间+n*UE的eDRX周期计算出距离当前时间最近的一个时间进行寻呼消息2的发送。
例如，在所述UE从连接态转入空闲态之后核心网设备未向各个基站发送过UE的寻呼消息，本次要发送的寻呼消息是在UE从连接态转入空闲态之后向各个基站发送的UE的第一条寻呼消息；则本步骤中，核心网设备判断在UE从连接态转入空闲态之后未发送过UE的寻呼消息，核心网设备不再另外计算寻呼消息的发送时间，直接向基站发送寻呼消息。
或者，核心网设备向基站发送寻呼消息可以包括：
核心网设备判断在所述UE从连接态转入空闲态之后是否发送过UE的寻呼消息；
如果核心网设备在所述UE从连接态转入空闲态之后未发送过UE的寻呼消息，所述核心网设备直接向基站发送所述寻呼消息；
如果核心网设备在所述UE从连接态转入空闲态之后发送过UE的寻呼消息，核心网设备根据预先存储的发送参考时间和参考时间间隔、与UE的eDRX周期确定本次发送寻呼消息的时间，在本次发送寻呼消息的时间到来时，核心网设备向基站发送所述寻呼消息。具体计算公式可以为：本次寻呼消息发送时间＝发送参考时间+参考时间间隔+m*eDRX。m为自然数，m的取值最好使得计算得到的本次寻呼消息发送时间超过当前时间且最接近当前时间。
其中，核心网设备中存储的发送参考时间和参考时间间隔是不断更新的，更新的原则和方法可以为：
核心网设备在每次发送寻呼消息时，如果接收到基站在执行步骤c时发送的第一时间间隔，则核心网设备使用该寻呼消息的发送时间更新所述发送参考时间，使用接收到的第一时间间隔更新所述参考时间间隔。
进一步地，如果参考时间间隔是所有基站公用的，如果核心网设备接收到多个基站发送的第一时间间隔，可以选择数值最小的第一时间间隔进行参考时间间隔的更新；如果每个基站均对应着一个参考时间间隔，则核心网设备可以使用对应基站发送的第一时间间隔来更新该基站对应的参考时间间隔。
步骤c：基站接收寻呼消息，根据所述eDRX周期计算所述UE的PF和PO，确定所述UE的PF和PO指示的寻呼时刻距离当前时间的时间间隔大于预设时间阈值时，向核心网设备发送第一时间间隔；所述第一时间间隔小于等于所述UE的寻呼时刻距离所述当前时间的时间间隔；执行步骤d；
其中，如果基站确定所述寻呼时刻距离当前时间的时间间隔小于预设时间阈值时，执行步骤508；
其中，接收到寻呼消息的基站也可以不全部向核心网设备发送第一时间间隔，而是由部分基站发送第一时间间隔，具体基站发送或不发送第一时间间隔可以在实际应用中自主设定，只要所述UE的PF和PO指示的寻呼时刻距离当前时间的时间间隔大于预设时间阈值时至少有一个基站发送了第一时间间隔即可。
在一种可能的实现方式中，寻呼消息中可以包括推荐小区列表或者推荐基站列表；如果寻呼消息中包括推荐小区列表，可以由推荐小区列表中所列出的小区的基站来向核心网设备发送第一时间间隔，如果寻呼消息中包括推荐基站列表，可以由推荐基站列表中所列出的基站来向核心网设备发送第一时间间隔。
步骤d：核心网设备接收基站发送的第一时间间隔。
步骤e：所述核心网设备根据接收到的所述第一时间间隔向所述基站发送寻呼消息。
所述核心网设备根据接收到的所述第一时间间隔向所述基站发送寻呼消息，可以包括：
对于每个基站，所述核心网设备根据该基站发送的第一时间间隔，在该基站的第一时间间隔之后向该基站发送寻呼消息；或者，
所述核心网设备从各个基站发送的第一时间间隔中选择最小的第一时间间隔，在所述最小的第一时间间隔之后向各个基站发送寻呼消息。
也即，如果只有一个基站发送了第一时间间隔，核心网设备可以在该基站的第一时间间隔之后向寻呼区中的基站发送寻呼消息；
如果有至少两个基站发送了第一时间间隔，核心网设备可以从中选择最小的第一时间间隔，在最小的第一时间间隔之后向寻呼区中的基站发送寻呼消息；核心网设备也可以按照每个基站的第一时间间隔向每个基站发送寻呼消息。
可选的，所述核心网设备根据接收到的所述第一时间间隔向所述基站发送寻呼消息后，包括：对于后续的发送到该终端的寻呼消息，核心网可以基于所述基站发送的第一时间间隔和终端的寻呼eDRX周期计算该终端后续的寻呼帧位置。
也就是说，在基站上报时间间隔之前，核心网保存终端的寻呼消息。对于后续的发送到该终端的寻呼消息，核心网可以基于上述基站反馈的时间间隔和终端的寻呼eDRX周期计算该终端后续的寻呼帧位置。具体的计算公式可以为：基站反馈时间间隔所在的寻呼帧位置+N*寻呼eDRX周期。
其中，当核心网设备与基站之间执行步骤a～步骤e时，如果步骤e中有至少两个基站发送了第一时间间隔，核心网设备从中选择最小的第一时间间隔，在 最小的第一时间间隔之后向寻呼区中的基站发送寻呼消息，由于核心网设备从中选择最小的第一时间间隔，则对于某一个基站而言，UE的PF和PO指示的寻呼时刻距离该基站接收到核心网设备再次发送的寻呼消息的时间间隔仍然可能大于预设时间阈值，这时，基站可以再次向核心网设备发送第一时间间隔，直到寻呼时刻距离该基站接收到核心网设备发送的寻呼消息的时间间隔小于预设时间阈值，或者，基站向核心网设备发送第一时间间隔的连续次数达到某一预设的次数阈值；之后，基站执行步骤507。其中，可以由核心网设备通过寻呼消息向每个基站指示基站的次数阈值，也可以预先将基站的次数阈值设置于基站中。
步骤507：基站接收所述寻呼消息，根据其中携带的eDRX周期以及UE标识计算UE的PF和PO；
步骤508：UE在进入空闲态时，根据eDRX周期以及UE标识计算UE的PF和PO，在PF和PO指示的寻呼时刻之前的第一时刻醒来，确定UE是否进行小区重选，如果进行小区重选，完成小区重选后，在重选小区的寻呼信道上监听寻呼消息；如果不进行小区重选，在当前小区的寻呼信道上监听寻呼消息，或进入睡眠状态直到寻呼时刻之前醒来在当前小区的寻呼信道上监听寻呼信道。
其中，所述第一时刻与所述寻呼时刻之间的时间间隔大于等于所述UE完成一次小区重选的时间。
其中，如果步骤501的帧信息中仅包括无线帧号，则所述第一时刻与所述寻呼时刻之间的时间间隔优选大于等于所述UE完成一次小区重选的时间与一个无线帧的时长之和。
其中，步骤507和步骤508之间没有执行顺序限制，两个步骤只要分别在步骤509之前执行即可。
步骤509：在UE的PF和PO指示的寻呼时刻，UE所在小区所属的基站向UE发送寻呼消息，UE接收所述寻呼消息。
其中，当UE接收到寻呼消息时，UE发起随机接入过程，建立与基站和核心网设备的连接，核心网设备在UE接入网络后发送下行数据给UE，这一处理过程这里不再赘述。
本实施例中，核心网设备维护同一个寻呼区域内的基站保持无线帧以及子帧的同步状态，来实现UE在不同寻呼小区中寻呼时刻的基本同步，在eDRX机制下，即使UE出现小区重选，只要在寻呼时刻到来前完成小区重选就不会错过新小区的寻呼时刻，因为只要是同一寻呼区域，重选前小区的寻呼时刻和重选后小 区的寻呼时刻在时间是相同的。
核心网设备将寻呼消息保存到寻呼时刻之前才下发给基站，可以减少基站对寻呼消息的存储时间；
UE在寻呼时刻到来之前的第一时刻醒来查看是否进行小区重选，保证寻呼时刻不在小区重选过程中出现，以防止UE错过寻呼时刻。
参见图6，为本发明实施例寻呼方法一种流程示意图；该方法包括：
步骤601：在每个同步时机到来时，核心网设备确定基准帧信息，所述基准帧信息包括：无线帧号和子帧号，向基站发送所述基准帧信息。
本步骤的实现可以参考步骤501，这里不赘述。
步骤602：基站接收所述基准帧信息，将基站中当前无线帧的帧号更新为所述基准帧信息中携带的所述无线帧号，将所述基站中当前无线帧的子帧号更新为所述基准帧信息中携带的所述子帧号。
步骤603：基站向核心网设备发送所述基准帧信息的接收确认消息，核心网设备在预设时间内接收各个基站发送的接收确认消息。
其中，所述接收确认消息可以是新定义的S1口消息，也可以通过在现有基站发送给核心网设备的控制消息或数据消息中增加携带该接收确认消息的IE实现。
其中，基站发送该接收确认消息，可以是基站和核心网设备之间预先协商设定，也可以由核心网设备通过携带所述帧信息的消息指示给基站。
其中，可以设定如果核心网设备在预设时间内没有接收到某一个或某几个基站发送的接收确认消息，重新触发执行步骤501直到预设的最大发送次数或者接收到基站发送的接收确认消息。
本步骤为可选步骤。
步骤604：所述核心网设备接收UE在连接态发送的所述UE的eDRX周期。
其中，核心网设备可以将UE的eDRX周期保存在核心网设备中。
步骤605：当所述UE的下行数据到达且所述UE处于空闲态时，核心网设备判断在所述UE从连接态转入空闲态之后是否发送过UE的寻呼消息，如果否，核心网设备直接向基站发送所述寻呼消息；如果是，核心网设备根据最近一次发送UE的寻呼消息的时间与UE的eDRX周期确定本次发送寻呼消息的时间，在本次发送寻呼消息的时间到来时，核心网设备向基站发送寻呼消息。
寻呼消息中包括：UE标识。
例如，在UE从连接态转入空闲态之后核心网设备向各个基站发送过UE的寻呼消息1，本次要发送的寻呼消息是寻呼消息2；
则本步骤中，核心网设备判断在UE从连接态转入空闲态之后发送过UE的寻呼消息1，核心网设备根据最近一次发送寻呼消息1的时间以及UE的eDRX周期按照公式最近一次发送寻呼消息1的时间+n*UE的eDRX周期计算出距离当前时间最近的一个时间进行寻呼消息2的发送。
例如，在所述UE从连接态转入空闲态之后核心网设备未向各个基站发送过UE的寻呼消息，本次要发送的寻呼消息是在UE从连接态转入空闲态之后核心网设备向各个基站发送的UE的第一条寻呼消息；则本步骤中，核心网设备判断在UE从连接态转入空闲态之后未发送过UE的寻呼消息，核心网设备不再另外计算寻呼消息的发送时间，可以即时向基站发送寻呼消息。
步骤606：基站接收寻呼消息，根据所述eDRX周期计算所述UE的PF和PO，基站判断所述UE的PF和PO指示的寻呼时刻距离当前时间的时间间隔是否大于预设时间阈值；如果是，向核心网设备发送第一时间间隔，所述第一时间间隔小于等于所述UE的寻呼时刻距离所述当前时间的时间间隔，执行步骤607；如果否，执行步骤609。
在一种可能的实现方式中，第一时间间隔可以用于向核心网设备指示发送第一时间间隔的基站所计算的UE的寻呼时刻。具体的，在不考虑基站和核心网设备之间信息传输时延和处理时延时，第一时间间隔可以等于UE的寻呼时刻距离所述当前时间的时间间隔，则核心网设备可以在当前时间上加上第一时间间隔得到UE的寻呼时刻；如果考虑基站和核心网设备之间信息传输的时延和处理时延，第一时间间隔需小于UE的寻呼时刻距离所述当前时间的时间间隔，具体可以为：UE的寻呼时刻距离所述当前时间的时间间隔-传输时延-处理时延，则核心网设备仍然可以在当前时间上加上第一时间间隔得到UE的寻呼时刻。
其中，可以为每个基站设置对于同一个寻呼消息，向核心网设备连续发送第一时间间隔的次数阈值，该次数阈值可以由核心网设备指示给每个基站，例如在发给基站的寻呼消息中携带次数阈值，或者，也可以在基站中预先设置该基站的次数阈值。当为基站设置了次数阈值时，如果基站判断所述UE的PF和PO指示的寻呼时刻距离当前时间的时间间隔大于预设时间阈值，针对基站接收到的这一寻呼消息，基站还需判断基站向核心网设备发送第一时间间隔的连续次数是否达 到次数阈值，如果达到次数阈值，执行步骤609；如果未达到次数阈值，执行步骤607。
其中，接收到寻呼消息的基站也可以不全部向核心网设备发送第一时间间隔，而是由部分基站发送第一时间间隔，具体基站发送或不发送第一时间间隔可以在实际应用中自主设定，只要所述UE的PF和PO指示的寻呼时刻距离当前时间的时间间隔大于预设时间阈值时至少有一个基站发送了第一时间间隔即可。
在一种可能的实现方式中，寻呼消息中可以包括推荐小区列表或者推荐基站列表；如果寻呼消息中包括推荐小区列表，可以由推荐小区列表中所列出的小区的基站来向核心网设备发送第一时间间隔，如果寻呼消息中包括推荐基站列表，可以由推荐基站列表中所列出的基站来向核心网设备发送第一时间间隔。
对于不向核心网设备发送第一时间间隔的基站，当步骤605中核心网设备发送了寻呼消息时、或者当步骤608中核心网设备再次发送了寻呼消息时，基站接收寻呼消息，根据所述eDRX周期计算所述UE的PF和PO，之后，执行步骤609～610。
步骤607：核心网设备接收基站发送的第一时间间隔。
步骤608：核心网设备根据接收到的所述第一时间间隔向所述基站发送寻呼消息；执行步骤606；
所述核心网设备根据接收到的所述第一时间间隔向所述基站发送寻呼消息，可以包括：
对于每个基站，所述核心网设备根据该基站发送的第一时间间隔，在该基站的第一时间间隔之后向该基站发送寻呼消息；或者，
所述核心网设备从各个基站发送的第一时间间隔中选择最小的第一时间间隔，在所述最小的第一时间间隔之后向各个基站发送寻呼消息。
也即，如果只有一个基站发送了第一时间间隔，核心网设备可以在该基站的第一时间间隔之后向寻呼区中的基站发送寻呼消息；或者，
如果有至少两个基站发送了第一时间间隔，核心网设备可以从中选择最小的第一时间间隔，在最小的第一时间间隔之后向寻呼区中的基站发送寻呼消息；核心网设备也可以按照每个基站的第一时间间隔向每个基站发送寻呼消息。
可选的，所述核心网设备根据接收到的所述第一时间间隔向所述基站发送寻呼消息后，包括：对于后续的发送到该UE的寻呼消息，核心网设备可以基于所述基站发送的第一时间间隔和UE的eDRX周期计算该UE后续的寻呼帧位置。
也就是说，在基站上报时间间隔之前，核心网保存UE的寻呼消息。对于后续的发送到该UE的寻呼消息，核心网可以基于上述基站反馈的第一时间间隔和UE的eDRX周期计算该UE后续的寻呼帧位置。具体的计算公式可以为：基站反馈第一时间间隔所在的寻呼帧位置+N*寻呼eDRX周期，N为自然数。
步骤609：UE在进入空闲态时，根据eDRX周期以及UE标识计算UE的PF和PO，在PF和PO指示的寻呼时刻之前的第一时刻醒来，确定UE是否进行小区重选，如果进行小区重选，完成小区重选后，在重选小区的寻呼信道上监听寻呼消息；如果不进行小区重选，在当前小区的寻呼信道上监听寻呼消息，或进入睡眠状态直到寻呼时刻之前醒来在当前小区的寻呼信道上监听寻呼信道。
其中，所述第一时刻与所述寻呼时刻之间的时间间隔大于等于所述UE完成一次小区重选的时间。
其中，如果步骤601的帧信息中仅包括无线帧号，则所述第一时刻与所述寻呼时刻之间的时间间隔优选大于等于所述UE完成一次小区重选的时间与一个无线帧的时长之和。
步骤610：在UE的PF和PO指示的寻呼时刻，UE所在小区所属的基站向UE发送寻呼消息，UE接收所述寻呼消息。
其中，当UE接收到寻呼消息时，UE发起随机接入过程，建立与基站和核心网设备的连接，核心网设备在UE接入网络后发送下行数据给UE，这一处理过程这里不再赘述。
本实施例中，核心网设备维护同一个寻呼区域内的基站保持无线帧以及子帧的同步状态，来实现UE在不同寻呼小区中寻呼时刻的基本同步，在eDRX机制下，即使UE出现小区重选，只要在寻呼时刻到来前完成小区重选就不会错过新小区的寻呼时刻，因为只要是同一寻呼区域，重选前小区的寻呼时刻和重选后小区的寻呼时刻在时间是相同的。
核心网设备将寻呼消息保存到寻呼时刻之前才下发给基站，可以减少基站对寻呼消息的存储时间；
UE在寻呼时刻到来之前的第一时刻醒来查看是否进行小区重选，保证寻呼时刻不在小区重选过程中出现，以防止UE错过寻呼时刻。
参见图7，为本发明实施例寻呼方法一种流程示意图；该方法包括：
步骤701：在每个同步时机到来时，核心网设备确定基准帧信息，所述基准 帧信息包括：无线帧号和子帧号，向基站发送所述基准帧信息。
本步骤的实现可以参考步骤501，这里不赘述。
步骤702：基站接收所述基准帧信息，将基站中当前无线帧的帧号更新为所述基准帧信息中携带的所述无线帧号，将所述基站中当前无线帧的子帧号更新为所述基准帧信息中携带的所述子帧号。
步骤703：基站向核心网设备发送所述基准帧信息的接收确认消息，核心网设备在预设时间内接收各个基站发送的接收确认消息。
其中，所述接收确认消息可以是新定义的S1口消息，也可以通过在现有基站发送给核心网设备的控制消息或数据消息中增加携带该接收确认消息的IE实现。
其中，基站发送该接收确认消息，可以是基站和核心网设备之间预先协商设定，也可以由核心网设备通过携带所述帧信息的消息指示给基站。
其中，可以设定如果核心网设备在预设时间内没有接收到某一个或某几个基站发送的接收确认消息，重新触发执行步骤501直到预设的最大发送次数或者接收到基站发送的接收确认消息。
本步骤为可选步骤。
步骤704：所述核心网设备接收UE在连接态发送的所述UE的eDRX周期。
其中，核心网设备可以将UE的eDRX周期保存在核心网设备中。
步骤705：当所述UE的下行数据到达且所述UE处于空闲态时，核心网设备判断在所述UE从连接态转入空闲态之后是否发送过UE的寻呼消息，如果否，核心网设备直接向基站发送所述寻呼消息，执行步骤707；如果是，执行步骤706；
步骤706：核心网设备根据最近一次发送UE的寻呼消息的时间、eDRX周期以及所述最近一次发送UE的寻呼消息对应的第二时间间隔确定本次发送寻呼消息的时间，在本次发送寻呼消息的时间到来时，核心网设备向基站发送寻呼消息，执行步骤707；
最近一次发送UE的寻呼消息对应的第二时间间隔是指：在核心网设备最近一次发送UE的寻呼消息时，各个基站对应反馈的寻呼响应消息中携带的第二时间间隔。
其中，核心网设备根据最近一次发送UE的寻呼消息的时间、eDRX周期以及所述最近一次发送UE的寻呼消息对应的第二时间间隔确定本次发送寻呼消息的时间，可以包括：
核心网设备从所述第二时间间隔中选择数值最小的第二时间间隔；
核心网设备根据以下公式确定本次发送寻呼消息的时间：
本次发送寻呼消息的时间＝最近一次发送UE的寻呼消息的时间+M*eDRX周期+数值最小的第二时间间隔；M为自然数，M的取值最好使得计算得到的本次发送寻呼消息的时间位于当前时间之后且距离当前时间最近。
其中，如果基站反馈的第二时间间隔未考虑基站和核心网设备之间的传输时延和处理时延，上述公式中计算得到的本次发送寻呼消息的时间可以通过减去传输时延和处理时延进行修正；如果基站反馈的第二时间间隔考虑了基站和核心网设备之间的传输时延和处理时延，则上述公式中计算得到的本次发送寻呼消息的时间可以无需进行修正。
步骤707：基站接收寻呼消息，根据所述eDRX周期计算所述UE的PF和PO，向核心网设备发送寻呼响应消息，寻呼响应消息中包括：第二时间间隔；第二时间间隔用于向核心网设备指示所述UE的PF和PO所指示的寻呼时刻；
其中，如果不考虑基站和核心网设备之间的传输时延和处理时延问题，第二时间间隔可以等于UE的PF和PO指示的寻呼时刻距离当前时间的时间间隔；如果考虑基站和核心网设备之间的传输时延和处理时延问题，第二时间间隔可以小于UE的PF和PO指示的寻呼时刻距离当前时间的时间间隔，具体可以为：UE的PF和PO指示的寻呼时刻距离当前时间的时间间隔-传输时延-处理时延。
步骤708：UE在进入空闲态时，根据eDRX周期以及UE标识计算UE的PF和PO，在PF和PO指示的寻呼时刻之前的第一时刻醒来，确定UE是否进行小区重选，如果进行小区重选，完成小区重选后，在重选小区的寻呼信道上监听寻呼消息；如果不进行小区重选，在当前小区的寻呼信道上监听寻呼消息，或进入睡眠状态直到寻呼时刻之前醒来在当前小区的寻呼信道上监听寻呼信道。
其中，所述第一时刻与所述寻呼时刻之间的时间间隔大于等于所述UE完成一次小区重选的时间。
其中，如果步骤701的帧信息中仅包括无线帧号，则所述第一时刻与所述寻呼时刻之间的时间间隔优选大于等于所述UE完成一次小区重选的时间与一个无线帧的时长之和。
步骤709：在UE的PF和PO指示的寻呼时刻，UE所在小区所属的基站向UE发送寻呼消息，UE接收所述寻呼消息。
其中，当UE接收到寻呼消息时，UE发起随机接入过程，建立与基站和核 心网设备的连接，核心网设备在UE接入网络后发送下行数据给UE，这一处理过程这里不再赘述。
本实施例中，核心网设备维护同一个寻呼区域内的基站保持无线帧以及子帧的同步状态，来实现UE在不同寻呼小区中寻呼时刻的基本同步，在eDRX机制下，即使UE出现小区重选，只要在寻呼时刻到来前完成小区重选就不会错过新小区的寻呼时刻，因为只要是同一寻呼区域，重选前小区的寻呼时刻和重选后小区的寻呼时刻在时间是相同的。
核心网设备将寻呼消息保存到寻呼时刻之前才下发给基站，可以减少基站对寻呼消息的存储时间；
UE在寻呼时刻到来之前的第一时刻醒来查看是否进行小区重选，保证寻呼时刻不在小区重选过程中出现，以防止UE错过寻呼时刻。
与上述方法相对应的，本发明实施例提供一种核心网设备，参见图8，核心网设备800包括：
处理器810，用于确定同步时机到来时，所述核心网设备确定基准帧信息，所述基准帧信息包括：无线帧号；
发送器820，用于向寻呼区中的基站发送所述处理器确定的所述基准帧信息，以便所述基站根据所述基准帧信息同步所述基站中的无线帧。
可选地，所述处理器具体用于：
确定所述寻呼区中有新基站连接至所述核心网设备；或者，
确定所述寻呼区中有基站重启后重新连接至所述核心网设备；或者，
确定到达每个同步周期的同步时刻；或者，
接收到所述寻呼区中的至少一个基站发送的同步请求消息。
可选地，所述处理器具体用于：
预先存储初始的无线帧号；
计算当前时间与初始时刻之间的绝对时间偏差，所述初始时刻是所述无线帧号指示的无线帧的初始时刻；
将所述绝对时间偏差和所述初始的无线帧号确定为基准帧信息。
可选地，所述处理器具体用于：
预先存储初始的无线帧号；
根据无线帧的时长持续将存储的所述无线帧号更新为所述核心网设备当前 无线帧的帧号；
读取所述核心网设备存储的无线帧号。
可选地，所述帧信息还包括：子帧号；所述处理器具体用于：
预先存储初始的无线帧号和子帧号；
根据系统寻呼帧和子帧的时长持续将存储的所述无线帧号更新为当前无线帧的帧号、将存储的所述子帧号更新为当前无线帧中当前子帧的子帧号；
读取所述核心网设备存储的无线帧号和子帧号。
可选地，还包括：
接收器，用于接收第一基站发送的所述第一基站的帧信息，所述帧信息包括：所述第一基站发送所述帧信息时所述第一基站的无线帧号；所述第一基站是寻呼区中的基站；
所述处理器还用于：将所述第一基站的帧信息确定为所述基准帧信息。
可选地，还包括：
接收器，用于接收第一基站发送的所述第一基站的帧信息，所述帧信息包括：所述第一基站发送所述帧信息时所述第一基站的无线帧号和子帧号；所述第一基站是寻呼区中的基站；
所述处理器还用于：将所述第一基站的帧信息确定为所述基准帧信息。
可选地，所述发送器还用于：在所述接收器接收所述第一基站的帧信息之前，向所述第一基站发送帧信息请求。
可选地，还包括：
接收器，用于接收所述基站在接收到所述帧信息后发送的接收确认消息。
可选地，还包括：
接收器，用于接收UE在连接态发送的所述UE的eDRX周期；
所述处理器还用于：根据所述eDRX周期计算所述UE的PF和PO；
所述发送器还用于：当所述UE的下行数据到达且所述UE处于空闲态时，在所述PF和PO指示的寻呼时刻之前向基站发送寻呼消息，以便所述基站将所述寻呼消息发送给所述UE。
可选地，所述核心网设备向基站发送寻呼消息的时刻，在计算所述PF和PO的时刻以及所述寻呼时刻之间更接近所述寻呼时刻。
可选地，还包括：
接收器，用于接收UE在连接态发送的所述UE的eDRX周期；
发送器，用于当所述UE的下行数据到达且所述UE处于空闲态时，向基站发送寻呼消息，所述寻呼消息中包括所述UE的eDRX周期；
所述接收器还用于：接收所述基站发送的第一时间间隔，所述第一时间间隔在所述基站根据所述eDRX周期计算所述UE的PF和PO、并确定所述UE的PF和PO指示的寻呼时刻距离当前时间的时间间隔大于预设时间阈值时发送；所述第一时间间隔小于等于所述UE的寻呼时刻距离所述当前时间的时间间隔；
所述发送器还用于：根据接收到的所述第一时间间隔向所述基站发送寻呼消息。
可选地，所述发送器具体用于：对于每个基站，根据该基站发送的第一时间间隔，在该基站的第一时间间隔之后向该基站发送寻呼消息；或者，
从各个基站发送的第一时间间隔中选择最小的第一时间间隔，在所述最小的第一时间间隔之后向各个基站发送寻呼消息。
可选地，所述发送器具体用于：
确定所述UE从连接态转入空闲态之后未发送过UE的寻呼消息，即时向基站发送所述寻呼消息；或者，
确定所述UE从连接态转入空闲态之后发送过UE的寻呼消息，根据最近一次发送所述UE的寻呼消息的时间与所述UE的eDRX周期确定本次发送寻呼消息的时间，在本次发送寻呼消息的时间到来时，向基站发送所述寻呼消息。
可选地，所述发送器具体用于：
确定所述UE从连接态转入空闲态之后未发送过UE的寻呼消息，即时向基站发送所述寻呼消息；或者，
确定所述UE从连接态转入空闲态之后发送过UE的寻呼消息，根据预先存储的发送参考时间和参考时间间隔、与UE的eDRX周期确定本次发送寻呼消息的时间，在本次发送寻呼消息的时间到来时，核心网设备向基站发送所述寻呼消息。
可选地，所述处理器还用于：
在每次发送寻呼消息时，如果接收到基站发送的第一时间间隔，使用该寻呼消息的发送时间更新所述发送参考时间，使用接收到的第一时间间隔更新所述参考时间间隔。
可选地，还包括：
接收器，用于接收UE在连接态发送的所述UE的eDRX周期；
所述处理器还用于：当所述UE的下行数据到达且所述UE处于空闲态，且，确定所述UE从连接态转入空闲态之后发送过所述UE的寻呼消息时，根据最近一次发送所述UE的寻呼消息的时间、所述UE的eDRX周期以及所述最近一次发送UE的寻呼消息对应的第二时间间隔确定本次发送寻呼消息的时间；
所述发送器还用于：当所述UE的下行数据到达且所述UE处于空闲态，且，确定所述UE从连接态转入空闲态之后未发送过所述UE的寻呼消息时，即时向基站发送寻呼消息；或者，当所述UE的下行数据到达且所述UE处于空闲态，且，确定所述UE从连接态转入空闲态之后发送过所述UE的寻呼消息时，在本次发送寻呼消息的时间到来时，向基站发送寻呼消息；
最近一次发送UE的寻呼消息对应的第二时间间隔为：在核心网设备最近一次发送UE的寻呼消息时，各个基站对应反馈的寻呼响应消息中携带的第二时间间隔；
所述第二时间间隔用于向核心网设备指示基站计算的所述UE的寻呼时刻。
可选地，所述处理器具体用于：从所述第二时间间隔中选择数值最小的第二时间间隔；
根据以下公式确定本次发送寻呼消息的时间：
本次发送寻呼消息的时间＝最近一次发送UE的寻呼消息的时间+M*eDRX周期+所述数值最小的第二时间间隔；M为自然数。
本实施例中，核心网设备向基站发送核心网设备当前的基准帧信息，基准帧信息包括：无线帧号，以便基站根据所述基准帧信息更新基站中的无线帧，从而使得核心网设备与基站之间至少无线帧号同步，将核心网设备与基站之间的时间差限制在无线帧的时长之内，从而尽量缩小不同基站的小区之间的时间误差，从而能够在一定程度上减少UE虽然在当前小区的寻呼时刻之前完成小区重选仍然错过新小区的寻呼时刻的问题的发生。
本发明实施例还提供一种基站，参见图9，该基站900包括：
接收器910，用于接收核心网设备发送的基准帧信息，所述基准帧信息包括：无线帧号；
处理器920，用于根据所述接收器接收的所述基准帧信息同步所述基站中的无线帧。
可选地，所述处理器具体用于：
根据绝对时间偏差与一个无线帧的长度计算得到绝对时间偏差包括的无线帧的数量以及剩余时间偏差；
根据剩余时间偏差和子帧长度计算得到剩余时间偏差包括的子帧的数量；
将初始的无线帧号加上无线帧的数量，得到当前无线帧的帧号，根据子帧的数量确定当前无线帧中当前子帧的子帧号。
可选地，所述处理器具体用于：
将所述基站中当前无线帧的帧号更新为所述基准帧信息中携带的所述无线帧号。
可选地，所述帧信息还包括：子帧号；所述处理器具体用于：
将所述基站中当前无线帧的帧号更新为所述基准帧信息中携带的所述无线帧号，将所述基站中当前无线帧的子帧号更新为所述基准帧信息中携带的所述子帧号。
可选地，该基站还包括：
发送器，用于向所述核心网设备发送所述基准帧信息的接收确认消息。
可选地，该基站还包括：
所述接收器还用于：接收所述核心网设备发送的寻呼消息；
所述处理器还用于：根据所述寻呼消息中携带的eDRX周期以及UE标识计算UE的PF和PO；
所述发送器还用于：在所述UE的PF和PO指示的寻呼时刻发送所述UE的寻呼消息。
可选地，该基站还包括：
所述接收器还用于：接收所述核心网设备发送的寻呼消息；
所述处理器还用于：根据所述寻呼消息中携带的eDRX周期以及UE标识计算UE的PF和PO；确定所述PF和PO指示的寻呼时刻距离当前时间的时间间隔大于预设时间阈值时，确定第一时间间隔；
所述发送器还用于：将确定的第一时间间隔发送给所述核心网设备；所述第一时间间隔小于等于寻呼时刻距离当前时间的时间间隔；
所述接收器还用于：接收所述核心网设备根据所述第一时间间隔发送的所述UE的寻呼消息。
可选地，所述处理器还用于：
从所述接收器接收到的所述寻呼消息中获取推荐小区列表，确定所述基站自 身是所述推荐小区列表中所列小区的基站；或者，
从所述接收器接收到的所述寻呼消息中获取推荐基站列表，确定所述基站自身是所述推荐小区列表中所列基站。
可选地，还包括：
所述接收器还用于：接收所述核心网设备发送的寻呼消息；
所述处理器还用于：根据所述寻呼消息中携带的eDRX周期以及UE标识计算UE的PF和PO；根据所述PF和PO指示的寻呼时刻距离当前时间的时间间隔确定第二时间间隔；
还包括：发送器，用于将所述第二时间间隔携带在寻呼响应消息中发送给所述核心网设备；所述第二时间间隔用于向所述核心网设备指示所述PF和PO指示的寻呼时刻。
可选地，所述发送器还用于：所述处理器判断当前时刻距离上一次接收到所述基准帧信息的时刻超过预设周期值时，向所述核心网设备发送同步请求消息，所述同步请求消息用于请求所述核心网设备发送当前的帧信息。
本实施例中，基站接收核心网设备发送的基准帧信息，所述基准帧信息包括：无线帧号，根据所述基准帧信息同步所述基站中的无线帧，从而使得核心网设备与基站之间至少无线帧号同步，将核心网设备与基站之间的时间差限制在无线帧的时长之内，从而尽量缩小不同基站的小区之间的时间误差，从而能够在一定程度上减少UE虽然在当前小区的寻呼时刻之前完成小区重选仍然错过新小区的寻呼时刻的问题的发生。
本发明实施例还提供一种用户设备，参见图10，该用户设备1000包括：
处理器1010，用于进入空闲态时，计算所述用户设备的PF和PO；在所述PF和PO指示的寻呼时刻之前的第一时刻醒来，确定所述用户设备是否进行小区重选；所述第一时刻与所述寻呼时刻之间的时间间隔大于等于所述用户设备完成一次小区重选的时间；如果进行小区重选，完成小区重选；
接收器1020，用于所述处理器确定进行小区重选时，在重选小区的寻呼信道上监听寻呼消息；所述处理器确定不进行小区重选时，在当前小区的寻呼信道上监听寻呼消息或进入睡眠状态直到寻呼时刻醒来在当前小区的寻呼信道上监听寻呼消息。
可选地，所述第一时刻与所述寻呼时刻之间的时间间隔大于等于所述用户设 备完成一次小区重选的时间与一个无线帧的时长之和。
本实施例中，UE进入空闲态时，计算的PF和PO，在所述PF和PO指示的寻呼时刻之前的第一时刻醒来，确定所述UE是否进行小区重选；所述第一时刻与所述寻呼时刻之间的时间间隔大于等于所述UE完成一次小区重选的时间；如果进行小区重选，完成小区重选后，在重选小区的寻呼信道上监听寻呼消息；
如果不进行小区重选，在当前小区的寻呼信道上监听寻呼消息，或进入睡眠状态直到寻呼时刻之前醒来在当前小区的寻呼信道上监听寻呼信道。从而尽量保证UE在当前小区的寻呼时刻之前完成小区重选，与前述核心网设备与基站之间至少无线帧号同步相结合，在一定程度上减少UE虽然在当前小区的寻呼时刻之前完成小区重选仍然错过新小区的寻呼时刻的问题的发生。
本领域的技术人员可以清楚地了解到本发明实施例中的技术可借助软件加必需的通用硬件平台的方式来实现。基于这样的理解，本发明实施例中的技术方案本质上或者说对现有技术做出贡献的部分可以以软件产品的形式体现出来，该计算机软件产品可以存储在存储介质中，如ROM/RAM、磁碟、光盘等，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)执行本发明各个实施例或者实施例的某些部分所述的方法。
本说明书中的各个实施例均采用递进的方式描述，各个实施例之间相同相似的部分互相参见即可，每个实施例重点说明的都是与其他实施例的不同之处。尤其，对于系统实施例而言，由于其基本相似于方法实施例，所以描述的比较简单，相关之处参见方法实施例的部分说明即可。
以上所述的本发明实施方式，并不构成对本发明保护范围的限定。任何在本发明的精神和原则之内所作的修改、等同替换和改进等，均应包含在本发明的保护范围之内。

Claims (60)

  1. 一种寻呼方法，其特征在于，包括：
    核心网设备确定同步时机到来时，所述核心网设备确定基准帧信息，所述基准帧信息包括：无线帧号；
    所述核心网设备向寻呼区中的基站发送所述基准帧信息，以便所述基站根据所述基准帧信息同步所述基站中的无线帧。
  2. 根据权利要求1所述的方法，其特征在于，所述核心网设备确定同步时机到来包括：
    所述核心网设备确定所述寻呼区中有新基站连接至所述核心网设备；或者，
    所述核心网设备确定所述寻呼区中有基站重启后重新连接至所述核心网设备；或者，
    所述核心网设备确定到达每个同步周期的同步时刻；或者，
    所述核心网设备接收到所述寻呼区中的至少一个基站发送的同步请求消息。
  3. 根据权利要求1或2所述的方法，其特征在于，所述核心网设备确定基准帧信息，包括：
    核心网设备预先存储初始的无线帧号；
    核心网设备计算当前时间与初始时刻之间的绝对时间偏差，所述初始时刻是所述无线帧号指示的无线帧的初始时刻；
    核心网设备将所述绝对时间偏差和所述初始的无线帧号确定为基准帧信息。
  4. 根据权利要求1或2所述的方法，其特征在于，所述核心网设备确定基准帧信息，包括：
    所述核心网设备预先存储初始的无线帧号；
    所述核心网设备根据无线帧的时长持续将存储的所述无线帧号更新为所述核心网设备当前无线帧的帧号；
    所述核心网设备读取所述核心网设备存储的无线帧号。
  5. 根据权利要求1或2所述的方法，其特征在于，所述基准帧信息还包括：子帧号；所述核心网设备确定基准帧信息，包括：
    所述核心网设备预先存储初始的无线帧号和子帧号；
    所述核心网设备根据系统寻呼帧和子帧的时长持续将存储的所述无线帧号更新为当前无线帧的帧号、将存储的所述子帧号更新为当前无线帧中当前子帧的 子帧号；
    所述核心网设备读取所述核心网设备存储的无线帧号和子帧号。
  6. 根据权利要求1或2所述的方法，其特征在于，所述核心网设备确定基准帧信息，包括：
    所述核心网设备接收第一基站发送的所述第一基站的帧信息，将所述第一基站的帧信息确定为所述基准帧信息；
    所述帧信息包括：所述第一基站发送所述帧信息时所述第一基站的无线帧号；所述第一基站是寻呼区中的基站。
  7. 根据权利要求1或2所述的方法，其特征在于，所述核心网设备确定基准帧信息，包括：
    所述核心网设备接收第一基站发送的所述第一基站的帧信息，将所述第一基站的帧信息确定为所述基准帧信息；
    所述帧信息包括：所述第一基站发送所述帧信息时所述第一基站的无线帧号和子帧号；所述第一基站是寻呼区中的基站。
  8. 根据权利要求6或7所述的方法，其特征在于，所述核心网设备确定基准帧信息，还包括：
    在接收所述第一基站的帧信息之前，所述核心网设备向所述第一基站发送帧信息请求。
  9. 根据权利要求1至8任一项所述的方法，其特征在于，所述核心网设备向基站发送所述帧信息之后，还包括：
    所述核心网设备接收所述基站在接收到所述帧信息后发送的接收确认消息。
  10. 根据权利要求1至9任一项所述的方法，其特征在于，还包括：
    所述核心网设备接收UE在连接态发送的所述UE的eDRX周期，根据所述eDRX周期计算所述UE的PF和PO；
    当所述UE的下行数据到达且所述UE处于空闲态时，所述核心网设备在所述PF和PO指示的寻呼时刻之前向基站发送寻呼消息，以便所述基站将所述寻呼消息发送给所述UE。
  11. 根据权利要求10所述的方法，其特征在于，所述核心网设备向基站发送寻呼消息的时刻，在计算所述PF和PO的时刻以及所述寻呼时刻之间更接近所述寻呼时刻。
  12. 根据权利要求1至9任一项所述的方法，其特征在于，还包括：
    所述核心网设备接收UE在连接态发送的所述UE的eDRX周期；
    当所述UE的下行数据到达且所述UE处于空闲态时，所述核心网设备向基站发送寻呼消息，所述寻呼消息中包括所述UE的eDRX周期；
    所述核心网设备接收所述基站发送的第一时间间隔，所述第一时间间隔在所述基站根据所述eDRX周期计算所述UE的PF和PO、并确定所述UE的PF和PO指示的寻呼时刻距离当前时间的时间间隔大于预设时间阈值时发送；所述第一时间间隔小于等于所述UE的寻呼时刻距离所述当前时间的时间间隔；
    所述核心网设备根据接收到的所述第一时间间隔向所述基站发送寻呼消息。
  13. 根据权利要求12所述的方法，其特征在于，所述核心网设备根据接收到的所述第一时间间隔向所述基站发送寻呼消息，包括：
    对于每个基站，所述核心网设备根据该基站发送的第一时间间隔，在该基站的第一时间间隔之后向该基站发送寻呼消息；或者，
    所述核心网设备从各个基站发送的第一时间间隔中选择最小的第一时间间隔，在所述最小的第一时间间隔之后向各个基站发送寻呼消息。
  14. 根据权利要求12所述的方法，其特征在于，所述核心网设备向基站发送寻呼消息，包括：
    所述核心网设备确定所述UE从连接态转入空闲态之后未发送过UE的寻呼消息，即时向基站发送所述寻呼消息；或者，
    所述核心网设备确定所述UE从连接态转入空闲态之后发送过UE的寻呼消息，根据最近一次发送所述UE的寻呼消息的时间与所述UE的eDRX周期确定本次发送寻呼消息的时间，在本次发送寻呼消息的时间到来时，向基站发送所述寻呼消息。
  15. 根据权利要求12所述的方法，其特征在于，所述核心网设备向基站发送寻呼消息，包括：
    所述核心网设备确定所述UE从连接态转入空闲态之后未发送过UE的寻呼消息，即时向基站发送所述寻呼消息；或者，
    所述核心网设备确定所述UE从连接态转入空闲态之后发送过UE的寻呼消息，根据预先存储的发送参考时间和参考时间间隔、与UE的eDRX周期确定本次发送寻呼消息的时间，在本次发送寻呼消息的时间到来时，核心网设备向基站发送所述寻呼消息。
  16. 根据权利要求15所述的方法，其特征在于，还包括：
    所述核心网设备在每次发送寻呼消息时，如果接收到基站发送的第一时间间隔，所述核心网设备使用该寻呼消息的发送时间更新所述发送参考时 间，使用接收到的第一时间间隔更新所述参考时间间隔。
  17. 根据权利要求1至9任一项所述的方法，其特征在于，还包括：
    所述核心网设备接收UE在连接态发送的所述UE的eDRX周期；
    当所述UE的下行数据到达且所述UE处于空闲态，且，所述核心网设备确定所述UE从连接态转入空闲态之后未发送过所述UE的寻呼消息时，所述核心网设备即时向基站发送寻呼消息；或者，当所述UE的下行数据到达且所述UE处于空闲态，且，所述核心网设备确定所述UE从连接态转入空闲态之后发送过所述UE的寻呼消息时，所述核心网设备根据最近一次发送所述UE的寻呼消息的时间、所述UE的eDRX周期以及所述最近一次发送UE的寻呼消息对应的第二时间间隔确定本次发送寻呼消息的时间，在本次发送寻呼消息的时间到来时，向基站发送寻呼消息；
    最近一次发送UE的寻呼消息对应的第二时间间隔为：在核心网设备最近一次发送UE的寻呼消息时，各个基站对应反馈的寻呼响应消息中携带的第二时间间隔；
    所述第二时间间隔用于向核心网设备指示基站计算的所述UE的寻呼时刻。
  18. 根据权利要求17所述的方法，其特征在于，所述核心网设备根据最近一次发送所述UE的寻呼消息的时间、所述UE的eDRX周期以及所述最近一次发送UE的寻呼消息对应的第二时间间隔确定本次发送寻呼消息的时间，包括：
    所述核心网设备从所述第二时间间隔中选择数值最小的第二时间间隔；
    所述核心网设备根据以下公式确定本次发送寻呼消息的时间：
    本次发送寻呼消息的时间＝最近一次发送UE的寻呼消息的时间+M*eDRX周期+所述数值最小的第二时间间隔；M为自然数。
  19. 一种寻呼方法，其特征在于，包括：
    基站接收核心网设备发送的基准帧信息，所述基准帧信息包括：无线帧号；
    所述基站根据所述基准帧信息同步所述基站中的无线帧。
  20. 根据权利要求19所述的方法，其特征在于，所述基站根据所述帧信息同步所述基站中的无线帧，包括：
    所述基站根据绝对时间偏差与一个无线帧的长度计算得到绝对时间偏差包括的无线帧的数量以及剩余时间偏差；
    所述基站根据剩余时间偏差和子帧长度计算得到剩余时间偏差包括的子帧的数量；
    所述基站将初始的无线帧号加上无线帧的数量，得到当前无线帧的帧号，根据子帧的数量确定当前无线帧中当前子帧的子帧号。
  21. 根据权利要求19所述的方法，其特征在于，所述基站根据所述帧信息同步所述基站中的无线帧，包括：
    所述基站将所述基站中当前无线帧的帧号更新为所述基准帧信息中携带的所述无线帧号。
  22. 根据权利要求19所述的方法，其特征在于，所述帧信息还包括：子帧号；所述基站根据所述帧信息同步所述基站中的无线帧，包括：
    所述基站将所述基站中当前无线帧的帧号更新为所述基准帧信息中携带的所述无线帧号，将所述基站中当前无线帧的子帧号更新为所述基准帧信息中携带的所述子帧号。
  23. 根据权利要求19至22任一项所述的方法，其特征在于，该方法还包括：
    所述基站向所述核心网设备发送所述基准帧信息的接收确认消息。
  24. 根据权利要求19至22任一项所述的方法，其特征在于，该方法还包括：
    所述基站接收所述核心网设备发送的寻呼消息；
    所述基站根据所述寻呼消息中携带的eDRX周期以及UE标识计算UE的PF和PO；
    所述基站在所述UE的PF和PO指示的寻呼时刻发送所述UE的寻呼消息。
  25. 根据权利要求19至22任一项所述的方法，其特征在于，该方法还包括：
    所述基站接收所述核心网设备发送的寻呼消息；
    所述基站根据所述寻呼消息中携带的eDRX周期以及UE标识计算UE的PF和PO；
    所述基站确定所述PF和PO指示的寻呼时刻距离当前时间的时间间隔大于预设时间阈值时，确定第一时间间隔，将确定的第一时间间隔发送给所述核心网设备；所述第一时间间隔小于等于寻呼时刻距离当前时间的时间间隔；
    所述基站接收所述核心网设备根据所述第一时间间隔发送的所述UE的寻呼消息。
  26. 根据权利要求25所述的方法，其特征在于，所述基站将确定的第一时间间隔发送给所述核心网设备之前，还包括：
    所述基站从接收到的所述寻呼消息中获取推荐小区列表，确定所述基站自身 是所述推荐小区列表中所列小区的基站；或者，
    所述基站从接收到的所述寻呼消息中获取推荐基站列表，确定所述基站自身是所述推荐小区列表中所列基站。
  27. 根据权利要求19至22任一项所述的方法，其特征在于，还包括：
    所述基站接收所述核心网设备发送的寻呼消息；
    所述基站根据所述寻呼消息中携带的eDRX周期以及UE标识计算UE的PF和PO；
    所述基站根据所述PF和PO指示的寻呼时刻距离当前时间的时间间隔确定第二时间间隔，将所述第二时间间隔携带在寻呼响应消息中发送给所述核心网设备；所述第二时间间隔用于向所述核心网设备指示所述PF和PO指示的寻呼时刻。
  28. 根据权利要求19至27任一项所述的方法，其特征在于，所述基站接收核心网设备发送的帧信息之前，还包括：
    所述基站判断当前时刻距离上一次接收到所述基准帧信息的时刻超过预设周期值时，向所述核心网设备发送同步请求消息，所述同步请求消息用于请求所述核心网设备发送当前的帧信息。
  29. 一种寻呼方法，其特征在于，包括：
    用户设备进入空闲态时，计算所述用户设备的PF和PO；
    所述用户设备在所述PF和PO指示的寻呼时刻之前的第一时刻醒来，确定所述用户设备是否进行小区重选；所述第一时刻与所述寻呼时刻之间的时间间隔大于等于所述用户设备完成一次小区重选的时间；
    如果进行小区重选，完成小区重选后，在重选小区的寻呼信道上监听寻呼消息；
    如果不进行小区重选，在当前小区的寻呼信道上监听寻呼消息或进入睡眠状态直到寻呼时刻醒来在当前小区的寻呼信道上监听寻呼消息。
  30. 根据权利要求29所述的方法，其特征在于，所述第一时刻与所述寻呼时刻之间的时间间隔大于等于所述用户设备完成一次小区重选的时间与一个无线帧的时长之和。
  31. 一种核心网设备，其特征在于，包括：
    处理器，用于确定同步时机到来时，所述核心网设备确定基准帧信息，所述 基准帧信息包括：无线帧号；
    发送器，用于向寻呼区中的基站发送所述处理器确定的所述基准帧信息，以便所述基站根据所述基准帧信息同步所述基站中的无线帧。
  32. 根据权利要求31所述的核心网设备，其特征在于，所述处理器具体用于：
    确定所述寻呼区中有新基站连接至所述核心网设备；或者，
    确定所述寻呼区中有基站重启后重新连接至所述核心网设备；或者，
    确定到达每个同步周期的同步时刻；或者，
    接收到所述寻呼区中的至少一个基站发送的同步请求消息。
  33. 根据权利要求31或32所述的核心网设备，其特征在于，所述处理器具体用于：
    预先存储初始的无线帧号；
    计算当前时间与初始时刻之间的绝对时间偏差，所述初始时刻是所述无线帧号指示的无线帧的初始时刻；
    将所述绝对时间偏差和所述初始的无线帧号确定为基准帧信息。
  34. 根据权利要求31或32所述的核心网设备，其特征在于，所述处理器具体用于：
    预先存储初始的无线帧号；
    根据无线帧的时长持续将存储的所述无线帧号更新为所述核心网设备当前无线帧的帧号；
    读取所述核心网设备存储的无线帧号。
  35. 根据权利要求31或32所述的核心网设备，其特征在于，所述帧信息还包括：子帧号；所述处理器具体用于：
    预先存储初始的无线帧号和子帧号；
    根据系统寻呼帧和子帧的时长持续将存储的所述无线帧号更新为当前无线帧的帧号、将存储的所述子帧号更新为当前无线帧中当前子帧的子帧号；
    读取所述核心网设备存储的无线帧号和子帧号。
  36. 根据权利要求31或32所述的核心网设备，其特征在于，还包括：
    接收器，用于接收第一基站发送的所述第一基站的帧信息，所述帧信息包括：所述第一基站发送所述帧信息时所述第一基站的无线帧号；所述第一基站是寻呼区中的基站；
    所述处理器还用于：将所述第一基站的帧信息确定为所述基准帧信息。
  37. 根据权利要求31或32所述的核心网设备，其特征在于，还包括：
    接收器，用于接收第一基站发送的所述第一基站的帧信息，所述帧信息包括：所述第一基站发送所述帧信息时所述第一基站的无线帧号和子帧号；所述第一基站是寻呼区中的基站；
    所述处理器还用于：将所述第一基站的帧信息确定为所述基准帧信息。
  38. 根据权利要求36或37所述的核心网设备，其特征在于，所述发送器还用于：在所述接收器接收所述第一基站的帧信息之前，向所述第一基站发送帧信息请求。
  39. 根据权利要求31至38任一项所述的核心网设备，其特征在于，还包括：
    接收器，用于接收所述基站在接收到所述帧信息后发送的接收确认消息。
  40. 根据权利要求31至39任一项所述的核心网设备，其特征在于，还包括：
    接收器，用于接收UE在连接态发送的所述UE的eDRX周期；
    所述处理器还用于：根据所述eDRX周期计算所述UE的PF和PO；
    所述发送器还用于：当所述UE的下行数据到达且所述UE处于空闲态时，在所述PF和PO指示的寻呼时刻之前向基站发送寻呼消息，以便所述基站将所述寻呼消息发送给所述UE。
  41. 根据权利要求40所述的核心网设备，其特征在于，所述核心网设备向基站发送寻呼消息的时刻，在计算所述PF和PO的时刻以及所述寻呼时刻之间更接近所述寻呼时刻。
  42. 根据权利要求31至39任一项所述的核心网设备，其特征在于，还包括：
    接收器，用于接收UE在连接态发送的所述UE的eDRX周期；
    发送器，用于当所述UE的下行数据到达且所述UE处于空闲态时，向基站发送寻呼消息，所述寻呼消息中包括所述UE的eDRX周期；
    所述接收器还用于：接收所述基站发送的第一时间间隔，所述第一时间间隔在所述基站根据所述eDRX周期计算所述UE的PF和PO、并确定所述UE的PF和PO指示的寻呼时刻距离当前时间的时间间隔大于预设时间阈值时发送；所述第一时间间隔小于等于所述UE的寻呼时刻距离所述当前时间的时间间隔；
    所述发送器还用于：根据接收到的所述第一时间间隔向所述基站发送寻呼消息。
  43. 根据权利要求42所述的核心网设备，其特征在于，所述发送器具体用于：对于每个基站，根据该基站发送的第一时间间隔，在该基站的第一时间间隔之后向该基站发送寻呼消息；或者，
    从各个基站发送的第一时间间隔中选择最小的第一时间间隔，在所述最小的第一时间间隔之后向各个基站发送寻呼消息。
  44. 根据权利要求42所述的核心网设备，其特征在于，所述发送器具体用于：
    确定所述UE从连接态转入空闲态之后未发送过UE的寻呼消息，即时向基站发送所述寻呼消息；或者，
    确定所述UE从连接态转入空闲态之后发送过UE的寻呼消息，根据最近一次发送所述UE的寻呼消息的时间与所述UE的eDRX周期确定本次发送寻呼消息的时间，在本次发送寻呼消息的时间到来时，向基站发送所述寻呼消息。
  45. 根据权利要求42所述的核心网设备，其特征在于，所述发送器具体用于：
    确定所述UE从连接态转入空闲态之后未发送过UE的寻呼消息，即时向基站发送所述寻呼消息；或者，
    确定所述UE从连接态转入空闲态之后发送过UE的寻呼消息，根据预先存储的发送参考时间和参考时间间隔、与UE的eDRX周期确定本次发送寻呼消息的时间，在本次发送寻呼消息的时间到来时，核心网设备向基站发送所述寻呼消息。
  46. 根据权利要求45所述的核心网设备，其特征在于，所述处理器还用于：
    在每次发送寻呼消息时，如果接收到基站发送的第一时间间隔，使用该寻呼消息的发送时间更新所述发送参考时间，使用接收到的第一时间间隔更新所述参考时间间隔。
  47. 根据权利要求31至39任一项所述的核心网设备，其特征在于，还包括：
    接收器，用于接收UE在连接态发送的所述UE的eDRX周期；
    所述处理器还用于：当所述UE的下行数据到达且所述UE处于空闲态，且，确定所述UE从连接态转入空闲态之后发送过所述UE的寻呼消息时，根据最近一次发送所述UE的寻呼消息的时间、所述UE的eDRX周期以及所述最近一次发送UE的寻呼消息对应的第二时间间隔确定本次发送寻呼消息的时间；
    所述发送器还用于：当所述UE的下行数据到达且所述UE处于空闲态，且， 确定所述UE从连接态转入空闲态之后未发送过所述UE的寻呼消息时，即时向基站发送寻呼消息；或者，当所述UE的下行数据到达且所述UE处于空闲态，且，确定所述UE从连接态转入空闲态之后发送过所述UE的寻呼消息时，在本次发送寻呼消息的时间到来时，向基站发送寻呼消息；
    最近一次发送UE的寻呼消息对应的第二时间间隔为：在核心网设备最近一次发送UE的寻呼消息时，各个基站对应反馈的寻呼响应消息中携带的第二时间间隔；
    所述第二时间间隔用于向核心网设备指示基站计算的所述UE的寻呼时刻。
  48. 根据权利要求47所述的核心网设备，其特征在于，所述处理器具体用于：从所述第二时间间隔中选择数值最小的第二时间间隔；
    根据以下公式确定本次发送寻呼消息的时间：
    本次发送寻呼消息的时间＝最近一次发送UE的寻呼消息的时间+M*eDRX周期+所述数值最小的第二时间间隔；M为自然数。
  49. 一种基站，其特征在于，包括：
    接收器，用于接收核心网设备发送的基准帧信息，所述基准帧信息包括：无线帧号；
    处理器，用于根据所述接收器接收的所述基准帧信息同步所述基站中的无线帧。
  50. 根据权利要求49所述的基站，其特征在于，所述处理器具体用于：
    根据绝对时间偏差与一个无线帧的长度计算得到绝对时间偏差包括的无线帧的数量以及剩余时间偏差；
    根据剩余时间偏差和子帧长度计算得到剩余时间偏差包括的子帧的数量；
    将初始的无线帧号加上无线帧的数量，得到当前无线帧的帧号，根据子帧的数量确定当前无线帧中当前子帧的子帧号。
  51. 根据权利要求49所述的基站，其特征在于，所述处理器具体用于：
    将所述基站中当前无线帧的帧号更新为所述基准帧信息中携带的所述无线帧号。
  52. 根据权利要求49所述的基站，其特征在于，所述帧信息还包括：子帧号；所述处理器具体用于：
    将所述基站中当前无线帧的帧号更新为所述基准帧信息中携带的所述无线帧号，将所述基站中当前无线帧的子帧号更新为所述基准帧信息中携带的所述子帧号。
  53. 根据权利要求49至52任一项所述的基站，其特征在于，该基站还包括：
    发送器，用于向所述核心网设备发送所述基准帧信息的接收确认消息。
  54. 根据权利要求49至52任一项所述的基站，其特征在于，该基站还包括：
    所述接收器还用于：接收所述核心网设备发送的寻呼消息；
    所述处理器还用于：根据所述寻呼消息中携带的eDRX周期以及UE标识计算UE的PF和PO；
    所述发送器还用于：在所述UE的PF和PO指示的寻呼时刻发送所述UE的寻呼消息。
  55. 根据权利要求49至52任一项所述的基站，其特征在于，该基站还包括：
    所述接收器还用于：接收所述核心网设备发送的寻呼消息；
    所述处理器还用于：根据所述寻呼消息中携带的eDRX周期以及UE标识计算UE的PF和PO；确定所述PF和PO指示的寻呼时刻距离当前时间的时间间隔大于预设时间阈值时，确定第一时间间隔；
    所述发送器还用于：将确定的第一时间间隔发送给所述核心网设备；所述第一时间间隔小于等于寻呼时刻距离当前时间的时间间隔；
    所述接收器还用于：接收所述核心网设备根据所述第一时间间隔发送的所述UE的寻呼消息。
  56. 根据权利要求55所述的基站，其特征在于，所述处理器还用于：
    从所述接收器接收到的所述寻呼消息中获取推荐小区列表，确定所述基站自身是所述推荐小区列表中所列小区的基站；或者，
    从所述接收器接收到的所述寻呼消息中获取推荐基站列表，确定所述基站自身是所述推荐小区列表中所列基站。
  57. 根据权利要求49至52任一项所述的基站，其特征在于，还包括：
    所述接收器还用于：接收所述核心网设备发送的寻呼消息；
    所述处理器还用于：根据所述寻呼消息中携带的eDRX周期以及UE标识计算UE的PF和PO；根据所述PF和PO指示的寻呼时刻距离当前时间的时间间隔确定第二时间间隔；
    还包括：发送器，用于将所述第二时间间隔携带在寻呼响应消息中发送给所述核心网设备；所述第二时间间隔用于向所述核心网设备指示所述PF和PO指 示的寻呼时刻。
  58. 根据权利要求49至57任一项所述的基站，其特征在于，所述发送器还用于：所述处理器判断当前时刻距离上一次接收到所述基准帧信息的时刻超过预设周期值时，向所述核心网设备发送同步请求消息，所述同步请求消息用于请求所述核心网设备发送当前的帧信息。
  59. 一种用户设备，其特征在于，包括：
    处理器，用于进入空闲态时，计算所述用户设备的PF和PO；在所述PF和PO指示的寻呼时刻之前的第一时刻醒来，确定所述用户设备是否进行小区重选；所述第一时刻与所述寻呼时刻之间的时间间隔大于等于所述用户设备完成一次小区重选的时间；如果进行小区重选，完成小区重选；
    接收器，用于所述处理器确定进行小区重选时，在重选小区的寻呼信道上监听寻呼消息；所述处理器确定不进行小区重选时，在当前小区的寻呼信道上监听寻呼消息或进入睡眠状态直到寻呼时刻醒来在当前小区的寻呼信道上监听寻呼消息。
  60. 根据权利要求59所述的用户设备，其特征在于，所述第一时刻与所述寻呼时刻之间的时间间隔大于等于所述用户设备完成一次小区重选的时间与一个无线帧的时长之和。
PCT/CN2015/086071 2015-05-19 2015-08-04 寻呼方法、用户设备、基站及核心网设备 WO2016183945A1 (zh)

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