WO2012167547A1 - Procédé de transfert intercellulaire entre des stations de base, station de base et système de communication - Google Patents

Procédé de transfert intercellulaire entre des stations de base, station de base et système de communication Download PDF

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Publication number
WO2012167547A1
WO2012167547A1 PCT/CN2011/082103 CN2011082103W WO2012167547A1 WO 2012167547 A1 WO2012167547 A1 WO 2012167547A1 CN 2011082103 W CN2011082103 W CN 2011082103W WO 2012167547 A1 WO2012167547 A1 WO 2012167547A1
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WO
WIPO (PCT)
Prior art keywords
base station
mme
link
target base
source base
Prior art date
Application number
PCT/CN2011/082103
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English (en)
Chinese (zh)
Inventor
李婧媛
Original Assignee
华为技术有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 华为技术有限公司 filed Critical 华为技术有限公司
Priority to CN201180002622.2A priority Critical patent/CN102598786B/zh
Priority to PCT/CN2011/082103 priority patent/WO2012167547A1/fr
Publication of WO2012167547A1 publication Critical patent/WO2012167547A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0055—Transmission or use of information for re-establishing the radio link
    • H04W36/0064—Transmission or use of information for re-establishing the radio link of control information between different access points

Definitions

  • the present invention relates to the field of mobile communications technologies, and in particular, to a technical solution for implementing inter-base station handover.
  • LTE Long Term Evolution
  • UMTS Universal Mobile Telecommunications System
  • the LTE system adopts a flat radio access network (Radio Access Network, RAN) structure, and cancels the radio network controller (Radio Network Control, called RNC).
  • RNC Radio Network Control
  • the LTE system includes an evolved base station (evolved-NodeB) and an evolved packet core network (Evolved Packer Core Network, EPC).
  • the eNBs are connected through an X2 interface, and the eNB and the EPC are connected through an S1 interface.
  • the EPC includes a Mobility Management Entity (MME) and a System Architecture Evolution Gateway (SAE GateWay, SGW).
  • MME Mobility Management Entity
  • SAE GateWay SGW
  • the MME acts as the control plane part and is responsible for the mobility management of the control plane, including user context and mobility state management, assigning user temporary identity, and the like.
  • the eNB and the MME implement the transmission of control plane signaling between the eNB and the MME through a proxy function of the S1 interface.
  • the SGW is used as a user plane part, and is responsible for initiating paging for downlink data in an idle state, and managing and storing Internet Protocol (IP) bearer parameters and intra-network routing information.
  • IP Internet Protocol
  • the proxy function between the eNB and the SGW is implemented by the proxy function of the S1 interface to implement user plane signaling between the eNB and the SGW.
  • switching is the basic feature of maintaining business continuity. Switching to power can guarantee the business continuity of the terminal.
  • the so-called handover means that when the terminal moves from the cell under one eNB to the cell under another eNB during the call, or the call quality of the terminal is degraded due to external interference, the original voice channel of the terminal needs to be changed and transferred to A new idle voice channel to continue the process of holding the call.
  • the handover can be divided into an S1 link handover between the eNB and the EPC, and an X2 link handover between the eNBs.
  • the eNB that initiates the handover may be referred to as a source eNB, and the eNB that receives the handover request may be referred to as a target eNB.
  • the industry expects a handover method between eNBs.
  • the source eNB initiates a handover request to the target eNB, it can select an appropriate handover method in the X2 link handover and the S1 link handover to successfully perform the source eNB to the target eNB. Switching.
  • Embodiments of the present invention provide a handover method between a base station, a base station, and a communication system, which are used to solve the problem of how to select an appropriate handover method in X2 link handover and S1 link handover.
  • An aspect of the present invention provides a method for switching between base stations, including:
  • the source base station sends a handover request message to the target base station, where the user equipment User Equipment (UE) serving the source base station is switched to the cell under the target base station;
  • UE User Equipment
  • the source base station Determining, by the source base station, the X2 link switch or the S1 according to the SI link state information between the target base station and the mobility management entity Mobile Management Entity (MME) serving the source base station and the UE camping Link switching.
  • MME Mobile Management Entity
  • a still further aspect of the present invention provides a method for switching between base stations, including:
  • a handover request message sent by the source base station where the user equipment User Equipment (UE) serving the source base station is switched to the cell under the target base station; and the target base station transmitting the location to the source base station a target base station, S 1 between a mobile management entity Mobile Management Entity (MME) serving the source base station and the UE camping Link state information, used by the source base station to confirm a ⁇ 2 link switch or an S1 link switch.
  • MME Mobile Management Entity
  • a sending unit configured to send a handover request message to the target base station, to switch the user equipment User Equipment (UE) that is served by the base station to a cell under the target base station
  • a processing unit configured to use, according to the target base station,
  • the SI link state information between the mobility management entity Mobile Management Entity (MME) serving the base station and camped by the UE is confirmed to perform an X2 link handover or an S1 link handover.
  • MME Mobility Management Entity
  • a further aspect of the present invention provides a base station, including:
  • a receiving unit configured to receive a handover request message sent by the source base station, to switch the user equipment User Equipment (UE) that provides the service by the source base station to a cell under the base station
  • a sending unit configured to send to the source base station Transmitting, by the base station, SI link state information between the mobile management entity Mobile Management Entity (MME) serving the source base station and the UE camping, so that the source base station confirms the ⁇ 2 link switch or the S1 chain Road switching.
  • MME Mobile Management Entity
  • a further aspect of the present invention provides a communication system, including:
  • the source base station is configured to send a handover request message to the target base station, so as to switch the user equipment User Equipment (UE) serving the base station to the cell under the target base station; and according to the target base station, and the service Performing an X2 link switch or an S1 link switch on the SI link state information between the source base station and the mobility management entity Mobile Management Entity (MME) where the UE camps;
  • UE User Equipment
  • MME Mobile Management Entity
  • the target base station is configured to receive a handover request message sent by the source base station, and send, to the source base station, S1 link state information between the target base station and an MME serving the source base station and the UE camping .
  • FIG. 1 is a schematic structural diagram of an LTE system in the prior art
  • FIG. 2 is a flowchart of a method for switching between base stations according to an embodiment of the present invention
  • FIG. 3 is a flowchart of a method for switching between base stations according to another embodiment of the present invention.
  • FIG. 4 is a flowchart of a method for switching between base stations according to another embodiment of the present invention.
  • FIG. 5 is a flowchart of a method for switching between base stations according to another embodiment of the present invention.
  • FIG. 6 is a schematic structural diagram of a base station according to another embodiment of the present invention.
  • FIG. 7 is a schematic structural diagram of a base station according to another embodiment of the present invention.
  • the technical solutions in the embodiments of the present invention are clearly and completely described in the following with reference to the accompanying drawings in the embodiments of the present invention.
  • the embodiments are a part of the embodiments of the invention, and not all of the embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present invention without departing from the inventive work are all within the scope of the present invention.
  • a terminal refers to a device that provides voice and/or data connectivity to a user, including a wireless terminal or a wired terminal.
  • the wireless terminal may be a handheld device having a wireless connection function, or another processing device connected to the wireless modem, and a mobile terminal that communicates with one or more core networks via a Radio Access Network (RAN).
  • RAN Radio Access Network
  • the wireless terminal can be a mobile phone (or "cellular" phone) and a computer with a mobile terminal.
  • the wireless terminal can also be a portable, pocket, handheld, computer built-in or in-vehicle mobile device.
  • the wireless terminal can also be a personal communication service (PCS) telephone, a cordless telephone, and a Session Initiated Protocol (Session Initiated Protocol). It is called SIP) phone, wireless local loop (WLL) station, personal digital assistant (PDA).
  • SIP Session Initiated Protocol
  • WLL wireless local loop
  • PDA personal digital assistant
  • the wireless terminal may also be referred to as a system, a Subscriber Unit, a Subscriber Station, a Mobile Station, a Mobile, a Remote Station, and an Access Point. Point ), Remote Terminal, Access Terminal, User Terminal, User Agent, User Device, or User Equipment (User Equipment) .
  • a base station refers to a device in an access network that communicates with a wireless terminal over one or more cells on an air interface.
  • the base station can be used to convert the received air frame into an inter-network protocol (Internet Protocol) packet as a router between the wireless terminal and the rest of the access network, wherein the rest of the access network can include IP.
  • the internet The base station can also coordinate the attribute management of the air interface.
  • the base station may be a Base Transceiver Station (BTS) in GSM or CDMA, or may be a base station (NodeB) in WCDMA, or may be an evolved Node B in LTE (called NodeB or The eNB or e-NodeB) is not limited by the present invention.
  • BTS Base Transceiver Station
  • NodeB base station
  • NodeB evolved Node B in LTE
  • system and “network” are used interchangeably herein.
  • the term “and/or” in this context is merely an association describing the associated object, indicating that there can be three relationships, for example, A and / or B, which can mean: A exists separately, A and B exist, B exists alone These three situations.
  • the character " in this article” generally means that the contextual object is an "or" relationship.
  • X2 link switching refers to mobility management that does not involve EPC relocation.
  • the handover process does not involve the MME and the SGW, and the source base station directly interacts with the target base station through the X2 interface to perform X2 link handover.
  • S1 link switching refers to mobility management involving EPC relocation.
  • MME relocation needs to be performed to perform S1 link switching.
  • the switching process of the X2 link includes:
  • the UE reports a measurement report to the source base station.
  • the source base station sends an X2 link switch request message to the target base station.
  • the X2 link switch request message includes information necessary for the target base station to prepare resources for handover, such as signaling context reference information of the UE in the source base station, S1 signaling context reference information of the UE, and identifier of the target cell.
  • the target base station sends an X2 link switch request acknowledgement message to the source base station.
  • the source base station sends the sequence number status information to the target base station to implement synchronization between the source base station and the target base station.
  • the source base station sends a radio resource control (Radio Resource Control) to the UE.
  • a radio resource control Radio Resource Control
  • the UE sends an RRC connection reconfiguration complete message to the target base station.
  • the target base station sends a path switch request message (Path Switch Request) to the MME.
  • the path switching request carries an indication that the target base station requests the MME to acquire UE user information.
  • the MME sends a Path Switch Acknowledge message to the target base station.
  • the path switching acknowledgement message carries the user information of the UE.
  • the target base station sends a release UE context message to the source base station.
  • the path switching acknowledgement message sent by the MME to the target base station carries the user information of the UE, and then the target base station sends a release UE context message to the source base station, informing the source base station that the X2 link switch has been successfully completed. , you can release the resources that were originally occupied.
  • the MME cannot acquire the user information of the UE.
  • the target base station can find that the S1 link with the target base station is normally available by searching in the MME group on the target side. MME1 and sends a Path Switch Request message to MME1.
  • the UE resides in the MME instead of the MME1, there is no user information of the UE in the MME1, and the MME1 does not process the path switch request message, causing the target base station to wait for the path switch confirmation message to time out, and the X2 link switch fails.
  • S1 link state information between the MMEs indicating whether the S1 link between the target base station and the MME serving the source base station and the UE camping is normal, to determine that the source base station and the target base station perform S1 link switching or The X2 link is switched, and the source base station is successfully switched to the target base station, so that the cell handover from the source base station to the cell under the target base station is implemented.
  • An embodiment of the present invention provides a method for switching between base stations. As shown in FIG. 2, the method includes:
  • the source base station sends a handover request message to the target base station, where the user equipment User Equipment (UE) that provides the service by the source base station is switched to the cell under the target base station.
  • UE User Equipment
  • the source base station confirms that the X2 link switch is performed according to the S1 link state information between the target base station and the mobility management entity Mobile Management Entity (MME) serving the source base station and the UE camping. Or S 1 link switching.
  • MME Mobile Management Entity
  • the source base station when the source base station confirms that the MME group serving the source base station and the MME group serving the target base station have the same MME group identifier (the MME Group ID), and the source When the X2 link between the base station and the target base station is normal, the source base station sends an X2 link switch request message to the target base station. At this time, the source base station defaults that the source base station and the target base station are served by the same MME, and the X2 link is available. Therefore, the handover between the source base station and the target base station does not need to pass through the S1 link of the MME, and passes between the source base station and the target base station. The X2 link can directly perform the switching action.
  • an MME can be uniquely identified by two identifiers, and the identifiers are respectively an MME Group ID and an MME key (called MME Code).
  • the source base station can obtain the MME Group ID of the MME group to which the source base station provides services. For example, when the source base station and When the MME group serving the source base station establishes an S1 link connection, the source base station may acquire the MME Group ID of the MME group serving the source base station. And, each MME in the MME group that provides the service to the source base station has the same MME Group ID and different MME Codes.
  • the target base station can also obtain the MME Group ID of the MME group to which the target base station is served. Moreover, each MME in the MME group that provides the service to the target base station has the same MME Group ID and a different MME Code.
  • the source base station can learn whether the X2 link between the source base station and the target base station is normal in an explicit manner or a stealth manner.
  • the dominant mode is that the source base station can obtain the state of the X2 link by using the status identifier on the source base station side.
  • the above status identifiers represent the three states of the X2 link, including: disconnected, busy, and normal.
  • the status indicator marks the status of the X2 link as disconnected, it indicates that the physical layer of the X2 link between the source base station and the target base station has not been configured yet, and the X2 link is unavailable.
  • the status indicator marks the status of the X2 link as busy, it indicates that the physical layer of the X2 link between the source base station and the target base station is connected, but the data cannot be transmitted via the X2 link, and the X2 link is unavailable.
  • the status indicator marks the status of the X2 link as normal, it indicates that the physical layer of the X2 link between the source base station and the target base station is connected, and data can be transmitted via the X2 link, and the X2 link is normally available.
  • the invisible mode is that the source base station or the target base station transmits data to the opposite end (the opposite end of the source base station is the target base station, and the opposite end of the target base station is the source base station.), if the peer end receives the above data, it indicates The X2 link between the source base station and the target base station is normally available. It can be understood by those skilled in the art that the X2 link between the source base station and the target base station is normal through other methods, and details are not described herein again.
  • the source base station when the A3 event is triggered, the source base station sends a handover request message to the target base station.
  • the above A3 event refers to when the quality of service in the neighboring cell is higher than the serving cell by a threshold.
  • the source base station when the quality of service of the cell under the target base station is higher than the quality of service of the cell under the source base station to which the UE is currently attached, the source base station sends a handover request message to the target base station, and is used to switch the UE to the target base station.
  • the above-mentioned threshold value may be a specific value or a numerical range, which is not limited by the present invention.
  • the MME that serves the source base station and the user equipment (User Equipment, UE) resides retains the user information of the UE.
  • the user information of the foregoing UE may be a security context, a roaming restriction, UE capability information, and the like related to the UE.
  • the source base station receives the S1 link state information between the target base station and the MME serving the source base station and the UE camped by the target base station.
  • the source base station terminates the X2 link switching with the target base station, and then performs S1 link switching.
  • the source base station and the target base station normally perform X2 link switching.
  • the source base station does not receive the S1 link state information between the target base station sent by the target base station and the MME serving the source base station and the UE camps, and the target base station sends a handover confirm message to the source base station, the source base station according to the handover confirm message
  • the source base station normally perform X2 link switching.
  • the foregoing S1 link state information indicating that the target base station is abnormal with an S1 link between the source base station and the MME that the UE camps on may carry the handover sent by the target base station to the source base station.
  • a cause value is added to the cell.
  • the reason value indicates that the S1 link abnormality between the target base station and the MME serving the source base station and the UE camping is not available.
  • the source base station may determine that the X2 link switch between the source base station and the target base station cannot be performed, and the X2 link switch needs to be terminated, and then the S1 link switch is performed.
  • the target base station and the service may be indicated according to the S1 link state information between the target base station that is sent by the target base station to the source base station and the MME that serves the source base station and the UE camps on.
  • the SI link between the source base station and the MME that the UE camps on is normal, to determine that the source base station and the target base station perform S1 link switching or X2 link switching, and successfully perform handover of the source base station to the target base station, and implement The UE switches from the cell under the source base station to the cell under the target base station.
  • Another embodiment of the present invention provides a method for switching between base stations. As shown in FIG. 3, the method includes: 401: A source base station acquires an MME key MME Code of an MME serving the source base station and camped by the UE.
  • the source base station receives, by the target base station, an MME Code set of an MME group serving the target base station, and an S1 chain between the MME represented by the MME Code and the target base station in the MME Code set.
  • the road is normal.
  • the source base station sends a handover request message to the target base station, where the user equipment User Equipment (UE) that provides the service by the source base station is switched to the cell under the target base station.
  • UE User Equipment
  • the source base station determines, according to the target base station, the SI link state information between the mobile management entity (MME) serving the source base station and the mobility management entity (MME) where the UE camps, performing an X2 link switch or S 1 link switching.
  • MME mobile management entity
  • MME mobility management entity
  • the source base station selects the camped EPC according to the user information of the UE, and selects a suitable MME in the MME group in the EPC for the UE according to the cell load balancing, so that the UE can reside in the above. In the MME. At this time, the source base station can acquire the MME Code of the MME serving the source base station and the UE camped on.
  • the source base station when the source base station and the target base station establish a connection, the source base station receives an X2 link connection setup request message (X2 Setup Request) or an X2 link connection setup response message sent by the target base station ( X2 Setup Response), the ⁇ 2 link connection establishment request message or the ⁇ 2 link connection establishment response message may include serving the target base station MME Code collection of MME groups. It can be understood by those skilled in the art that, in the process of establishing a connection between the source base station and the target base station, when the source base station first initiates the establishment of the connection requirement, the source base station sends an X2 link connection establishment request message to the target base station, and the target base station sends the source base station to the source base station.
  • the X2 link connection establishes a response message to confirm the connection.
  • the target base station first initiates the establishment of the connection requirement, the target base station sends an X2 link connection establishment request message to the source base station, and the source base station sends an X2 link connection establishment response message to the target base station to confirm the connection.
  • the source base station receives a configuration update message (Configuration Update) or a configuration update acknowledgement message (Configuration Update Acknowledge) sent by the target base station, where the configuration update is performed.
  • the message or the configuration update acknowledgement message may include an MME Code set of a group serving the target base station.
  • the connection between the source base station and the target base station is changed, when the related information of the source base station or the target base station changes (for example, when the number of cells under the source base station or the target base station changes), the opposite base station is notified to perform corresponding update.
  • the source base station when the source base station first initiates a reconfiguration request, the source base station sends a configuration update message to the target base station, and the target base station sends a configuration update acknowledgement message to the source base station. To confirm the reconfiguration connection.
  • the target base station When the target base station first initiates a reconfiguration request, the target base station sends a configuration update message to the source base station, and the source base station sends a configuration update confirmation message to the target base station to confirm the reconfiguration connection.
  • the source base station determines whether the MME Code of the MME that is served by the source base station and the UE is the same as the MME Code in the MME Code set, and performs X2 handover between the source base station and the target base station according to the determination result. Or switch with S1.
  • the source base station determines that the target base station serves the source base station and the UE
  • the SI link between the MMEs that are resident is normally available, and the mobility management of the EPC redirection is not required, and the source base station performs X2 link switching with the target base station.
  • the source base station determines the target base station and serves the source.
  • the S1 link state information between the target base station and the MME serving the target base station sent by the target base station to the source base station may be used to indicate that the target base station serves the source base station and the UE resides.
  • the S1 link between the MMEs is normal, and the S2 link switch or the X2 link switch is performed between the source base station and the target base station, and the source base station is successfully switched to the target base station, so that the cell handover from the source base station to the target base station is implemented.
  • Another embodiment of the present invention provides a method for switching between base stations. As shown in FIG. 4, the method includes:
  • the first base station sends, to the second base station, a first MME key (the MME Code) set of the MME group serving the first base station, and the MME represented by the MME Code in the first MME Code set.
  • the S1 link with the first base station is normal.
  • the first base station receives a second MME Code set that is sent by the second base station and serves the MME group of the second base station, and the MME and the MME code represented by the second MME Code set.
  • the S1 link between the second base stations is normal.
  • the first base station/second base station sends a handover request message to the second base station/first base station, the first base station/second base station according to the second base station/first base station, and serving the first The SI link state information between the base station/second base station and the mobility management entity Mobile Management Entity (MME) where the UE camps, confirms that X2 link switching or S1 link switching is performed.
  • MME Mobile Management Entity
  • the first base station obtains the first MME Code set
  • the second base station obtains the second MME Code set.
  • the base station where the UE camps can obtain the opposite end when the handover request is initiated, regardless of which base station the UE is to camp on.
  • S1 link state information between the base station and the MME where the UE resides For example, when the UE camps on the first base station, the first base station may acquire the MME Code of the MME where the UE resides through the first MME Code set. At the same time, the first base station receives the second MME Code set sent by the second base station.
  • the first base station When the first base station sends a handover request message to the second base station, the first base station compares whether the MME Code of the MME that the UE camps on is the same as the MME Code in the second MME Code set. If the same, the first base station learns that the S1 link between the second base station and the MME serving the first base station and the UE is normal, and performs X2 link switching. Different, the first base station learns that the S1 link between the second base station and the MME serving the first base station and the UE is abnormal, and performs S1 link switching. For another example, when the UE camps on the second base station, the second base station may obtain the MME Code of the MME where the UE resides through the second MME Code set.
  • the second base station receives the first MME Code sent by the first base station.
  • the second base station compares whether the MME Code of the MME that the UE camps on is the same as the MME Code in the first MME Code set.
  • the second base station learns that the S1 link between the first base station and the MME serving the second base station and the UE camping is normal, and performs X2 link switching.
  • the second base station learns that the S1 link between the first base station and the MME serving the second base station and the UE is abnormal, and performs S1 link switching.
  • the first base station/second base station that initiates the handover request message is the source base station
  • the first base station/second base station that receives the handover request is the target base station.
  • the S1 link state information between the target base station and the MME serving the target base station sent by the target base station to the source base station may be used to indicate that the target base station serves the source base station and the UE resides.
  • the S 1 link between the MMEs is normal, to determine the source base station and the target
  • the base station performs the SI link handover or the X2 link handover, and successfully performs the handover of the source base station to the target base station, so that the cell handover from the source base station to the cell under the target base station is implemented.
  • Another embodiment of the present invention provides a method for switching between base stations. As shown in FIG. 5, the method includes:
  • the target base station receives a handover request message sent by the source base station, and is used to switch the user equipment User Equipment (UE) that provides the service by the source base station to the cell under the target base station.
  • UE User Equipment
  • the target base station sends, to the source base station, SI link state information between the target base station and a mobility management entity Mobile Management Entity (MME) serving the source base station and the UE camping, for The source base station confirms that X2 link switching or S1 link switching is performed.
  • MME Mobile Management Entity
  • the target base station may be instructed to serve the source base station according to S1 link state information between the target base station and the MME serving the source base station and the UE camped by the target base station. Whether the S1 link between the MMEs in the UE is normal, and the S2 link switch or the X2 link switch between the source base station and the target base station is determined, and the handover of the source base station to the target base station is successfully performed to implement the cell handover of the UE from the source base station. To the cell under the target base station.
  • the foregoing program may be stored in a computer readable storage medium, and when executed, the program includes the above
  • the foregoing storage medium includes: a medium that can store program codes, such as a ROM, a RAM, a magnetic disk, or an optical disk.
  • the method includes: a sending unit 701, configured to send a handover request message to a target base station, so as to provide the user equipment User Equipment ( Switching to the cell under the target base station; the processing unit 702 is configured to serve the base station according to the target base station, and serve the UE
  • MME Mobile Management Entity
  • the base station further includes an acknowledgment unit, configured to confirm that the MME group serving the base station and the MME group serving the target base station have the same MME group identifier MME Group ID, and the base station and the The X2 link between the target base stations is normal, so that the base station performs X2 link switching with the target base station.
  • the base station further includes a first receiving unit, configured to receive S1 link state information between the target base station and the MME serving the base station and the UE camped by the target base station, so as to be The S1 link state information between the target base station and the MME serving the base station and the UE camping indicates that the S1 link between the target base station and the MME serving the base station and the UE camping is abnormal.
  • the base station terminates the X2 link switch with the target base station, and then performs an S1 link switch.
  • the first receiving unit is further configured to receive a handover preparation failure message sent by the target base station, where the handover preparation failure message includes the target base station and an MME serving the base station and the UE camping S1 link status information.
  • the base station further includes an acquiring unit, configured to acquire an MME key MME Code of the MME serving the base station and the UE camps, and a second receiving unit, configured to receive the service sent by the target base station
  • the MME Code set of the MME group of the target base station, and the S1 link between the MME represented by the MME Code and the target base station in the MME Code set is normal.
  • the base station further includes a determining unit, configured to determine, when the MME Code serving the eNB and the MME Code of the MME Code set in the MME Code set is the same as the MME Code in the MME Code set, An S1 link between the MME serving the base station and the UE camping is normal, the base station performs X2 link handover with the target base station; and when the serving the base station and the UE camps MME MME Code and the MME Code set When any of the MME codes is different, it is determined that the S1 link between the target base station and the MME serving the base station and the UE camps is abnormal, and the base station performs S1 link switching with the target base station.
  • a determining unit configured to determine, when the MME Code serving the eNB and the MME Code of the MME Code set in the MME Code set is the same as the MME Code in the MME Code set, An S1 link between the MME serving the base station and the UE camping is normal, the base station performs X2 link
  • the second receiving unit is further configured to: when the base station and the target base station establish a connection, receive a connection establishment request message or a connection establishment response message sent by the target base station, where the connection establishment request message or the The connection setup response message includes an MME Code set of MME groups serving the target base station.
  • the second receiving unit is further configured to: when the base station and the target base station need to reconfigure a connection, the base station receives a configuration update message or a configuration update confirmation message sent by the target base station, where the configuration The update message or the configuration update acknowledgement message includes a set of MME Codes serving the MME group of the target base station.
  • the base station in this embodiment is configured to implement an action performed by a source base station in the handover method between the base stations.
  • the sending unit 701 is configured to perform the action of the method 301 in the method for switching between the base stations in an embodiment
  • the processing unit 702 is configured to perform the action of 302 in the method for switching between the base stations in an embodiment.
  • the target base station may be instructed to serve the source base station according to S1 link state information between the target base station and the MME serving the source base station and the UE camped by the target base station. Whether the S1 link between the MMEs in the UE is normal, and the S2 link switch or the X2 link switch between the source base station and the target base station is determined, and the handover of the source base station to the target base station is successfully performed to implement the cell handover of the UE from the source base station. To the cell under the target base station.
  • the method includes: a receiving unit 801, configured to receive a handover request message sent by a source base station, to provide a service device for the source base station.
  • the equipment (UE) is switched to the cell under the base station;
  • the sending unit 802 is configured to send the base station to the source base station, and the mobility management entity Mobile Management Entity serving the source base station and the UE camping S 1 between ( MME ) Link state information, so that the source base station confirms to perform a ⁇ 2 link switch or an S1 link switch.
  • the base station further includes an indication unit, configured to indicate, by the base station, the base station and the service to the source base station via S1 link state information of the base station serving the source base station and the UE camping
  • the S1 link between the source base station and the UE camping is abnormal, and the source base station terminates the ⁇ 2 link switch with the base station, and then performs S1 link switching.
  • the sending unit 802 is further configured to send a handover preparation failure message to the source base station, where the handover preparation failure message includes the base station and the S1 serving the source base station and the UE camping Link status information.
  • the sending unit 802 is further configured to send, to the source base station, an MME Code set of a group serving the base station, where the MME represented by the MME Code in the MME Code set is between the eNB and the base station.
  • the S1 link is normal.
  • the base station in this embodiment is used to implement the actions performed by the target base station in the handover method between the base stations in other embodiments.
  • the receiving unit 801 can be used to perform the action of 601 in an embodiment
  • the sending unit 802 can be used to perform the action of 602 in an embodiment. Therefore, in this embodiment, the target base station may be instructed to serve the source base station according to S1 link state information between the target base station and the MME serving the source base station and the UE camped by the target base station.
  • the S1 link between the MMEs in the UE is normal, and the S2 link switch or the X2 link switch between the source base station and the target base station is determined, and the handover of the source base station to the target base station is successfully performed to implement the cell handover of the UE from the source base station. To the cell under the target base station.
  • Another embodiment of the present invention provides a communication system, the main structure of which includes:
  • the source base station configured to send a handover request message to the target base station, to switch the user equipment User Equipment (UE) serving the base station to the cell under the target base station; And performing X2 link cutting according to the SI link state information between the target base station and the mobility management entity Mobile Management Entity (MME) serving the source base station and the UE camping Switching or SI link switching;
  • MME Mobile Management Entity
  • the target base station is configured to receive a handover request message sent by the source base station; and send the target base station to the source base station, and the MME that serves the source base station and the UE resides S1 link state information.
  • the target base station may be instructed to serve the source base station according to S1 link state information between the target base station and the MME serving the source base station and the UE camped by the target base station. Whether the S1 link between the MMEs in the UE is normal, and the S2 link switch or the X2 link switch between the source base station and the target base station is determined, and the handover of the source base station to the target base station is successfully performed to implement the cell handover of the UE from the source base station. To the cell under the target base station.
  • An embodiment of the present invention provides a method for switching between base stations, including:
  • the target base station receives the X2 link switch request message sent by the source base station, and is used to switch the user equipment User Equipment (UE) that provides the service by the source base station to the cell under the target base station.
  • UE User Equipment
  • the target base station connects to a second MME that serves the source base station and the UE camps via a first mobility management entity Mobility Management Entity (MME) serving the target base station.
  • MME Mobility Management Entity
  • the target base station performs X2 link switching with the source base station.
  • the source base station when the source base station confirms that the MME group serving the source base station and the MME group serving the target base station have the same MME group identifier (the MME Group ID), and the source When the X2 link between the base station and the target base station is normal, the source base station sends an X2 link switch request message to the target base station. At this time, the source base station defaults that the source base station and the target base station are served by the same MME, and the X2 link is available. Therefore, the handover between the source base station and the target base station does not need to pass through the S1 link of the MME, and passes between the source base station and the target base station. The X2 link can directly perform the switching action.
  • an MME can be uniquely identified by two identifiers, and the identifiers are respectively an MME Group ID and an MME key (called MME Code).
  • Source base station can pass The MME Group ID of the MME group to which the service is itself obtained. For example, when the source base station and the MME group serving the source base station establish an S1 link connection, the source base station can acquire the MME Group ID of the MME group serving the source base station. And, each MME in the MME group that provides the service to the source base station has the same MME Group ID and different MME Codes.
  • the target base station can also obtain the MME Group ID of the MME group to which the target base station is served. Moreover, each MME in the MME group that provides the service to the target base station has the same MME Group ID and a different MME Code.
  • the source base station can learn whether the X2 link between the source base station and the target base station is normal in an explicit manner or a stealth manner.
  • the dominant mode is that the source base station can obtain the state of the X2 link by using the status identifier on the source base station side.
  • the above status indicators represent the three states of the X2 link, including: disconnected, busy, and normal. For example, when the status indicator marks the status of the X2 link as disconnected, the physical layer of the X2 link between the source base station and the target base station is not configured yet, and the X2 link is unavailable.
  • the status indicator marks the status of the X2 link as busy, it indicates that the physical layer of the X2 link between the source base station and the target base station is connected, but the data cannot be transmitted via the X2 link, and the X2 link is unavailable.
  • the status indicator marks the status of the X2 link as normal, it indicates that the physical layer of the X2 link between the source base station and the target base station is connected, and data can be transmitted via the X2 link, and the X2 link is normally available.
  • the invisible mode is that the source base station or the target base station transmits data to the opposite end (the opposite end of the source base station is the target base station, and the opposite end of the target base station is the source base station.), if the peer end receives the above data, it indicates The X2 link between the source base station and the target base station is normally available. It can be understood by those skilled in the art that the X2 link between the source base station and the target base station is normal through other methods, and details are not described herein.
  • the target base station connects to the second MME via the first MME.
  • the target base station needs to obtain the user information of the UE from the second MME, and then the normal between the source base station and the target base station can be completed.
  • X2 link switching When the S1 link status between the target base station and the second MME is abnormal, the normal data communication cannot be performed between the target base station and the second MME, and the target base station cannot directly acquire the user information of the UE from the second MME.
  • a connection is established between the first MME and the second MME, where the connection between the first MME and the second MME can be established through the S10 interface.
  • the target base station may indirectly obtain the foregoing in the second MME by using the first MME by using a normal S1 link state between the target eNB and the first MME, and a normal S10 link state between the first MME and the second MME.
  • User information of the UE may indirectly obtain the foregoing in the second MME by using the first MME by using a normal S1 link state between the target eNB and the first MME, and a normal S10 link state between the first MME and the second MME.
  • the user information of the UE may be a security context, a roaming restriction, a UE capability information, and the like related to the UE.
  • the path switching acknowledgement message sent by the first MME to the target base station carries the user information of the UE, and then the target base station sends a release UE context message to the source base station, notifying the source base station that the X2 link switch has been successfully completed, and the original can be released. Occupied resources.
  • the S1 link state between the target base station and the MME serving the source base station and the UE camping is abnormal
  • the user information of the UE is indirectly obtained, and the X2 link switching of the source base station to the target base station is successfully performed.
  • the UE switches from the cell under the source base station to the cell under the target base station.
  • Another embodiment of the present invention provides a method for switching between base stations, including:
  • the source base station sends an X2 link switch request message to the target base station, where the user equipment User Equipment (UE) serving the source base station is switched to the cell under the target base station.
  • UE User Equipment
  • the target base station sends an indication of acquiring user information of the UE to serve the target base station when the S1 link between the second MME and the target base station that the UE camps on is abnormal.
  • First MME First MME.
  • the first MME sends an indication of acquiring user information of the UE to the second MME.
  • the second MME sends user information of the UE to the first MME.
  • the target base station receives user information of the UE forwarded by the first MME.
  • the target base station sends a release UE context message to the source base station, where the X2 link switch between the source base station and the target base station is completed.
  • the target eNB may obtain the MME Group ID of the MME in the MME group.
  • the source eNB may also obtain the MME Group ID of the MME in the MME group.
  • the source base station selects the camped EPC according to the user information of the UE, and selects a suitable MME in the MME group in the EPC for the UE according to the cell load balancing, so that the UE can reside in the foregoing.
  • the source base station may acquire the MME Group ID of the MME serving the source base station and the UE camped on.
  • the first MME and the second MME when the first MME and the second MME are in the same MME group, the first MME and the second MME have the same MME Group ID.
  • the target base station finds the second MME in the MME group through the same MME Group ID but cannot communicate with the data, the target base station can also find the data suitable for data communication with the MME group through the same MME Group ID.
  • An MME obtains user information of the UE in the first MME indirectly through a normal S 10 link between the first MME and the second MME.
  • the target base station may send a path switch request message (Path Switch Request) to the first MME, where the path switch request message includes the indication of acquiring the user information of the UE.
  • Path Switch Request a path switch request message
  • the first MME sends a path switch request message to the second MME, where the path switch request message carries the indication of acquiring the user information of the UE.
  • the second MME can acquire the user information of the UE by itself, and send the user information of the UE to the first MME through the S10 link.
  • the second MME sends a path switch confirmation message to the first MME, where the path switch confirmation message includes user information of the UE.
  • the target base station receives a path switch acknowledgement message forwarded by the first MME, where the path switch acknowledgement message includes user information of the UE.
  • the S1 link state between the target base station and the MME serving the source base station and the UE camping is abnormal
  • the user information of the UE is indirectly obtained, and the X2 link switching of the source base station to the target base station is successfully performed.
  • the UE switches from the cell under the source base station to the cell under the target base station.
  • Another embodiment of the present invention provides a method for switching between base stations, including:
  • the second MME serving the source base station and the UE camping serves the first MME serving the target base station.
  • the second MME is connected to the target base station by using the first MME, where the target base station performs the X2 link switch request message with the source base station when the source base station sends an X2 link switch request message to the target base station.
  • X2 link switching
  • References 51 and 52 of the present embodiment can be referred to the related description in the method for switching between base stations in the other embodiments, and details are not described herein again.
  • the S1 link state between the target base station and the MME serving the source base station and the UE camping is abnormal
  • the user information of the UE is indirectly obtained, and the X2 link switching of the source base station to the target base station is successfully performed.
  • the UE switches from the cell under the source base station to the cell under the target base station.
  • a base station including:
  • the receiving unit 61 is configured to receive an X2 link switch request message sent by the source base station, to switch the user equipment User Equipment (UE) that provides the service by the source base station to the cell under the base station;
  • UE User Equipment
  • a connecting unit 62 configured to connect, by using a first MME serving the base station, a second MME serving the source base station and the UE camping;
  • a switching unit configured to perform X2 link switching with the source base station.
  • the base station in this embodiment is used to implement the target base station in the handover method between the base stations.
  • the action of the line For example, the receiving unit 61 is configured to perform the action of the method 31 in the method for switching between the base stations in an embodiment, and the connecting unit 62 is configured to perform the action of the method 32 in the method of switching between the base stations in an embodiment.
  • the S1 link state between the target base station and the MME serving the source base station and the UE camping is abnormal
  • the user information of the UE is indirectly obtained, and the X2 link switching of the source base station to the target base station is successfully performed.
  • the UE switches from the cell under the source base station to the cell under the target base station.
  • Another embodiment of the present invention provides a mobility management entity MME, including:
  • a connecting unit 71 configured to connect a first MME serving the target base station and an MME serving the source base station and the UE camping, so that the MME connects to the target base station via the first MME, to be used by the
  • the target base station performs X2 link switching with the source base station.
  • the mobility management entity of this embodiment is configured to implement the action performed by the second MME serving the source base station and camped by the UE in the handover method between the base stations in the foregoing embodiment.
  • the above connection unit 71 can be used to perform the actions of 51 in an embodiment.
  • the S1 link state between the target base station and the MME serving the source base station and the UE camping is abnormal
  • the user information of the UE is indirectly obtained, and the X2 link switching of the source base station to the target base station is successfully performed.
  • the UE switches from the cell under the source base station to the cell under the target base station.
  • Another embodiment of the present invention provides a network element management system, including:
  • the first MME is configured to connect to the second MME
  • the second MME is configured to connect to the first MME, so that the second MME connects to the target base station by using the first MME, and is configured to send, by the source base station, an X2 link switch to the target base station.
  • the target base station performs X2 link switching with the source base station.
  • the S1 link status between the target base station and the MME serving the source base station and the UE camping is abnormal
  • the user information of the UE is indirectly obtained, and the source base station successfully performs the target base station to the target base station.
  • the X2 link switching implements handover of the cell from the source base station to the cell under the target base station.
  • the disclosed systems, devices, and methods may be implemented in other ways.
  • the device embodiments described above are merely illustrative.
  • the division of the unit is only a logical function division.
  • there may be another division manner for example, multiple units or components may be combined or Can be integrated into another system, or some features can be ignored, or not executed.
  • the mutual coupling or direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection through some interface, device or unit, and may be in an electrical, mechanical or other form.
  • the components displayed as units may or may not be physical units, i.e., may be located in one place, or may be distributed over multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of the embodiment.
  • each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.
  • the above integrated unit can be implemented in the form of hardware or in the form of a software functional unit.
  • the integrated unit if implemented in the form of a software functional unit and sold or used as a standalone product, may be stored in a computer readable storage medium.
  • the technical solution of the present invention may contribute to the prior art or all or part of the technical solution may be embodied in the form of a software product stored in a storage medium.
  • a number of instructions are included to cause a computer device (which may be a personal computer, server, or network device, etc.) to perform all or part of the steps of the methods described in various embodiments of the present invention.
  • the foregoing storage medium includes: a U disk, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk, and the like, which can store program code. .
  • modules in the apparatus in the embodiment can be described in accordance with the embodiments. In the apparatus distributed in the embodiment, the corresponding change may also be made in one or more apparatuses different from the embodiment.
  • the modules of the above embodiments may be combined into one module, or may be further split into multiple sub-modules.

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Abstract

La présente invention concerne un procédé de transfert intercellulaire entre des stations de base, une station de base et un système de communication. Ledit procédé comprend les étapes suivantes au cours desquelles : une station de base source envoie le message de demande de transfert intercellulaire à une station de base cible, de sorte que l'équipement d'abonné (UE) desservi par la station de base source fera l'objet d'un transfert intercellulaire vers une cellule de ladite station de base cible ; ladite station de base source confirme que le transfert intercellulaire est un transfert intercellulaire de liaison X2 ou un transfert intercellulaire de liaison S1 en fonction des informations d'état de la liaison S1 entre ladite station de base cible et l'entité de gestion mobile (MME) qui dessert ladite station de base source et dans laquelle se trouve ledit UE. La présente invention peut sélectionner un procédé de transfert intercellulaire approprié parmi un transfert intercellulaire de liaison X2 et un transfert intercellulaire de liaison S1, ce qui permet un transfert intercellulaire d'une eNB source (station de base sur un nœud évolué) à une eNB cible.
PCT/CN2011/082103 2011-11-11 2011-11-11 Procédé de transfert intercellulaire entre des stations de base, station de base et système de communication WO2012167547A1 (fr)

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CN106792934A (zh) * 2015-11-25 2017-05-31 大唐移动通信设备有限公司 一种切换方法及装置
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