WO2012013107A1 - 切换场景判决过程中确定目标网元的方法及系统 - Google Patents

切换场景判决过程中确定目标网元的方法及系统 Download PDF

Info

Publication number
WO2012013107A1
WO2012013107A1 PCT/CN2011/076505 CN2011076505W WO2012013107A1 WO 2012013107 A1 WO2012013107 A1 WO 2012013107A1 CN 2011076505 W CN2011076505 W CN 2011076505W WO 2012013107 A1 WO2012013107 A1 WO 2012013107A1
Authority
WO
WIPO (PCT)
Prior art keywords
network element
rrc
information
target network
establishment
Prior art date
Application number
PCT/CN2011/076505
Other languages
English (en)
French (fr)
Inventor
韩立锋
高音
Original Assignee
中兴通讯股份有限公司
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 中兴通讯股份有限公司 filed Critical 中兴通讯股份有限公司
Publication of WO2012013107A1 publication Critical patent/WO2012013107A1/zh

Links

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
    • H04W36/0011—Control or signalling for completing the hand-off for data sessions of end-to-end connection
    • H04W36/0033—Control or signalling for completing the hand-off for data sessions of end-to-end connection with transfer of context information
    • 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
    • H04W36/0083—Determination of parameters used for hand-off, e.g. generation or modification of neighbour cell lists
    • H04W36/0085—Hand-off measurements
    • 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
    • H04W36/0083—Determination of parameters used for hand-off, e.g. generation or modification of neighbour cell lists
    • H04W36/00835—Determination of neighbour cell lists
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/08—Reselecting an access point
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/10—Connection setup
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W8/00—Network data management
    • H04W8/26—Network addressing or numbering for mobility support

Definitions

  • the present invention relates to a handover technique in a mobile communication system, and more particularly to a method and system for determining a target network element in a handover scenario decision process.
  • the Long Term Evolution (LTE) network consists of an evolved universal terrestrial radio access network (E-UTRAN, Evolved UTR AN), an evolved base station (eNB, Evolved NodeB), and an EPC (Evolved Packet Core). , the network is flat.
  • the E-UTRAN includes a set of eNBs connected to the EPC through the S1 interface, and the eNBs can be connected by X2.
  • the S1 interface and the X2 interface are logical interfaces.
  • One EPC can manage one or more eNBs, and one eNB can also be controlled by multiple EPCs - one eNB can manage one or more cells.
  • Self-organizing network is a technology that automatically performs network configuration and optimization.
  • the SON technology is characterized by self-configuration and self-optimization.
  • the application of the technology in LTE enables the LTE base station (ie, eNB) to automatically configure network parameters according to certain measurements and automatically optimize according to network changes, thereby maintaining optimal network performance. At the same time save a lot of manpower and material resources.
  • the handover includes handover within the LTE system and handover between systems, wherein the handover between the systems refers to a Universal Terrestrial Radio Access Network (UTRAN) or a Global System for Mobile Communications (GSM, Global System For Mobile Communication) or CDMA (Code Division Multiple Access) system switching.
  • UTRAN Universal Terrestrial Radio Access Network
  • GSM Global System for Mobile Communications
  • CDMA Code Division Multiple Access
  • the process of the terminal performing handover in the network generally includes: the network side according to the signal quality of the local cell and the neighboring cell reported by the terminal, and the handover decision made based on a certain handover algorithm, and then notifying the terminal according to the handover decision to perform a specific handover process. Execution.
  • the setting of inappropriate handover parameters may result in poor handover results such as ping-pong handover, handover failure, or radio link failure (RLF, Radio Link Failure), which are undesired handovers, causing user experience. Negative impact and wasted network resources. Therefore, for the handover parameter self-optimization, the accurate judgment of the handover failure or the undesired handover scenario is the basis for the handover parameter adjustment.
  • the user equipment When the radio link signal is poor or the handover fails, the user equipment (UE, User Equipment) may cause a radio link failure (RLF) and perform re-establishment of radio resource control (RRC).
  • RLF radio link failure
  • RRC radio resource control
  • the target cell is obtained through a procedure of cell selection. If the handover fails during the handover, the source base station or the target base station retains the user information for RRC re-establishment.
  • the UE may carry the terminal identifier (UE ID, UE-Identity), the UE's Cell Radio Network Temporary Identifier (C-RNTI), and the short MAC complete in the RRC re-establishment request message.
  • C-RNTI Cell Radio Network Temporary Identifier
  • Short MAC-I Short Medium Access Control integrity protection
  • PCI Cell physical address
  • PCI Physical Cell Identity
  • ECGI Evolved Cell Global Identifier
  • FIG. 1 is a schematic diagram of a scenario that is switched too late, as shown in FIG. 1, the UE is under eNB B.
  • RLF occurs in cell b (Cell b), or fails during handover from cell b to cell a (cell a); then, the UE attempts to perform RRC re-establishment in Cell a under eNB A.
  • Figure 1 illustrates the late handover of the UE from cell Cell b to cell Cell a.
  • FIG. 2 is a schematic diagram of a scenario in which the handover is too early.
  • a radio link failure occurs in Cell b.
  • the UE selects the cell Cell a for RRC reconstruction, that is, returns to the cell before handover to perform RRC reconstruction.
  • Figure 2 illustrates the premature switching of the UE from Cell a to Cell b.
  • FIG. 3 is a schematic diagram of a scenario of handover selection of an error cell.
  • RLF occurs, or The cell c to cell b fails during the handover process; then, the UE performs RRC reconstruction on the cell Cell a under the eNB A.
  • Figure 3 shows that the selected Cell b under eNB B is the wrong target cell, and the correct target cell is Cell a, that is, the UE should directly switch from Cell c to Cell a.
  • a handover scenario is as follows: The UE generates an RLF in the cell 2 of the eNB 2, and then selects the cell 1 in the eNB 1 to perform RRC re-establishment.
  • the method of judgment generally includes:
  • the UE sends an RRC re-establishment request message to the eNB1, and the eNB1 sends an RLF indication (RLF indication) information to the eNB2, where the RLC indication information includes the PCI of the cell2, the C-RNTI of the UE in the cell2, and the ECGI of the cell1;
  • RLF indication RLF indication
  • the short media access control integrity verification value (short MAC-I) and the UE RLF Report Container related to the radio link failure measured by the UE may further be carried, where the UE RLF Report Container Refers to the signal quality of the serving cell and surrounding cells measured by the UE that is saved and reported by the UE before or after the RLF;
  • the eNB2 After receiving the RLF indication information, the eNB2 matches the UE according to the context information of the UE, that is, the PCI and the C-RNTI, and can perform verification by using the short MAC-I. If there is a timer that is enabled after the UE is switched from cell1 to cell2, it is determined that the UE is switching from cell1 to cell2 too early; if there is a timer that is started after the UE switches from cell3 to cell2, it is determined that the UE is from cell3 to The cell2 switch is to select the wrong cell. And send a handover report message to the corresponding eNB. Otherwise, it is determined that the UE switches from cell2 to celll too late.
  • the target eNB that sends the RLF indication information is mapped by the eNB according to the PCI in the received RRC re-establishment request message of the UE, provided that the X2 interface is established between the eNB1 and the eNB2, so that the eNB1 can be based on
  • the PCI information of cell2 can map out the global base station identity (Global eNB ID) of eNB2, so that RLF indication information can be sent to eNB2.
  • the eNB1 cannot map out the global identifier and TAI information of the eNB2 according to the PCI information of the cell2, and of course, cannot address the target. eNB.
  • the UE generates RLF in cell 2 under eNB2 and fails to perform RRC re-establishment in cell1 under eNB1, the UE transits to idle state (Idle) state, and the cell reselects to eNB3.
  • the RRC establishment is successful in cell3.
  • one of the decision modes is shown in Figure 5.
  • the decision mode generally includes:
  • the eNB1 After receiving the RRC reestablishment request (RRC reestablish) message of the UE, the eNB1 sends the RLF indication information to the eNB2, and the eNB2 determines whether the handover is too early, or the handover is too late, or the wrong cell is selected according to the RLF indication; the eNB3 receives the UE.
  • RRC reestablishment request RRC reestablish
  • the RLF measurement information acquisition request is sent to the UE, and the UE reports the RLF measurement information; the eNB3 uses the RLF indication information to obtain the obtained RLF measurement information and the UE's identification information to eNBl, eNB3 ENBL the RLF indication information from the RLF itself as retransmission indication to the eNB2 transmits a second portion of the information to the e NB2, eNB2 RLF measurement information according to which the decision whether coverage problems.
  • the judgment method generally includes: The eNB 3 directly sends the obtained RLF measurement information and the identification information of the UE to the eNB 2, where the time difference between the UE switching from the last handover to the first RRC re-establishment attempt is included, and the eNB 2 determines whether the handover problem or the coverage problem, if the handover problem Then, the specific handover scenario is determined according to the time difference between the UE switching from the last handover to the first RRC re-establishment attempt, such as switching too late, or switching too early, or switching to the wrong cell.
  • the target network element cannot be guaranteed to be determined according to the RLF indication related information.
  • the implementation of the switching scenario does not guarantee that the network optimizes the specific handover parameters on the basis of this, which hinders the smooth implementation of the network self-optimization function, thereby reducing network performance.
  • the main object of the present invention is to provide a method and system for determining a target network element in a handover scenario decision process, which can uniquely determine addressing information of a target network element that sends RLF indication information, and ensure that the target network element is switched to the scenario.
  • the implementation of the decision, and to ensure that the network optimizes the implementation of specific handover parameters and the smooth implementation of the network's self-optimization function, thereby improving network performance.
  • a method for determining a target network element in a handover scenario decision process, after the cell reselection, the method includes: the user equipment UE and the reselection network element establish a connection process, and carry the addressing information of the target network element;
  • the network element is reselected, and the radio link failure RLF indication information is sent to the target network element according to the addressing information of the target network element carried in the connection establishment process.
  • the method also includes:
  • the UE performs RRC re-establishment of the radio resource control, and carries the addressing information of the target network element in the RRC re-establishment process;
  • the network element that is requested to be re-established by the RRC sends the RLF indication information to the target network element according to the addressing information of the carried target network element.
  • the target network element is a network element in which the UE generates an RLF; the sending the RLF indication information to the target network element includes:
  • the reselected network element sends RLF indication information to the network element in which the UE generates the RLF via the core network.
  • the method further includes: after the UE establishes a connection with the reselected network element, carrying the addressing information of the target network element; reselecting the network element, according to establishing a connection process
  • the addressing information of the target network element carried in the network element is used to send the RLF indication information to the target network element.
  • the target network element is a network element in which the UE generates RLF or a network element that is requested to be re-established by the RRC.
  • the addressing information of the target network element is carried in a UE information response message, or an RRC setup request message, or an RRC setup complete message.
  • the addressing information of the target network element is carried in an RRC re-establishment request message, or an RRC reestablishment complete message, or a UE information response message.
  • the method also includes:
  • the network element that is requested to be re-established by the RRC carries an indication in the RRC re-establishment message, or the RRC reconfiguration message, or other downlink message, to indicate whether the UE needs to report the addressing information of the target network element.
  • the UE When the indication indicates that the addressing information of the target network element needs to be reported, the UE carries the addressing information of the target network element by using an RRC re-establishment complete message or an RRC reconfiguration complete message.
  • the method further includes:
  • the RRC setup complete message sent by the UE to the network element that is requested to be re-established by the RRC carries an indication that the UE saves the RLF-related measurement information;
  • the network element that is requested to be re-established by the RRC sends a UE information request message to the UE, and requests the UE to perform RLF related measurement information;
  • the UE reports the RLF-related measurement information and the address information of the target network element to the network element that is requested to be re-established by the RRC.
  • the network element that is requested to be re-established by the RRC further carries an indication in the UE information request message, which is used to indicate that the UE reports the addressing information of the target network element.
  • the addressing information of the target network element is carried in an RRC setup request message, or an RRC setup complete message, or a UE information response message, or an RRC reconfiguration complete message or other uplink. In the message.
  • the method further includes: the reselection network element carrying an indication in the RRC setup message, or the UE information request message, or the RRC reconfiguration message, or other downlink message, to indicate whether the UE needs to report the addressing of the target network element information.
  • the target network element is a network element that is requested to be re-established by the RRC; the sending the RLF indication information to the target network element includes:
  • the network element that is requested to be re-established by the RRC sends the received RLF indication information as a self to the target network element.
  • the second part of the RLF indication information is sent to the target network element.
  • the target network element, or the network element that is requested to be re-established by the RRC, or the reselected network element is: a base station/home base station, or a radio network controller RNC, or a base station controller BSC.
  • the addressing information of the target network element is the addressing information required to send the RLF indication information to the target network element, specifically:
  • the addressing information includes global base station identifier and tracking area identifier TAI information, or information that can include the global base station identifier and TAI content;
  • the addressing information includes a location area identifier LAI, a routing area code RAC, a base station controller identifier, and an extended base station control.
  • LAI location area identifier
  • RAC routing area code
  • RAC base station controller
  • extended base station control extended base station control
  • the addressing information is a Cell Global Identity CGI.
  • a system for determining a target network element in a handover scenario decision process including at least a UE, a target network element, and a reselection network element, where
  • the UE is configured to: in the process of establishing a connection with the reselected network element, transmit the addressing information of the target network element to the reselected network element;
  • Reselecting the network element in the process of establishing a connection with the UE, acquiring the addressing information of the target network element, and after the RRC is successfully established, sending the RLF indication information to the target network element;
  • the target network element is configured to receive the RLF indication information.
  • the system further includes a network element that is requested to be re-established by the RRC, where
  • the UE is further configured to perform an RRC re-establishment process with the network element that is requested to be re-established by the RRC, and carry the addressing information of the target network element in the RRC re-establishment process;
  • the network element that is requested to be re-established by the RRC is configured to perform an RRC re-establishment process with the UE, obtain the addressing information of the target network element in the RRC re-establishment process, and send the RLF indication information to the target network element after the RRC re-establishment succeeds;
  • the target network element is further configured to receive RLF indication information from the network element that is requested to be re-established by the RRC, and complete the decision of the handover scenario.
  • the UE is further configured to: in the process of establishing a connection with the reselected network element, transmit the address information of the target network element to the reselected network element;
  • the reselecting the network element is further configured to: after the RRC is successfully established, send, to the network element that is requested to be re-established by the RRC, the RLF indication information, where the network element that is requested to be re-established by the RRC sends the RLF indication information to the target.
  • the second part of the RLF indication information of the network element is sent to the target network element.
  • the target network element, or a network element requesting RRC re-establishment, or a reselected network element is a base station/home base station;
  • the target network element, or a network element requesting RRC re-establishment, or a reselected network element is an RNC;
  • the target network element, or the network element requesting RRC re-establishment, or the reselected network element is a BSC.
  • the user equipment carries the addressing information of the target network element in the process of establishing a connection with the reselected network element; reselecting the network element, according to the establishment
  • the addressing information of the target network element carried in the connection process sends a radio link failure RLF indication information to the target network element.
  • the method of the invention accurately transmits the radio link failure indication information to the target network element, ensures the implementation of the decision of the target network element to the handover scenario, and ensures the optimization of the network for the specific handover parameters and the self-optimization of the network.
  • the smooth implementation of the function thereby improving network performance.
  • FIG. 1 is a schematic diagram of a scene that is switched too late
  • FIG. 2 is a schematic diagram of a scene that switches too early
  • FIG. 3 is a schematic diagram of a scenario of switching an incorrect cell
  • FIG. 4 is a schematic diagram of a handover scenario
  • FIG. 5 is a schematic diagram of a decision mode of the handover scenario shown in FIG. 4;
  • FIG. 5 is a schematic diagram of a decision mode of the handover scenario shown in FIG. 4;
  • FIG. 6 is a schematic diagram of another decision mode of the handover scenario shown in FIG. 4;
  • FIG. 7 is a flowchart of a method for determining a target network element in a handover scenario decision process according to the present invention
  • FIG. 8 is a schematic structural diagram of a system for determining a target network element in a handover scenario decision process according to the present invention. detailed description
  • FIG. 7 is a flowchart of a method for determining a target network element in a handover scenario decision process according to the present invention.
  • the method includes: Step 700: After the cell is reselected, the UE carries the addressing information of the target network element in the process of establishing a connection with the reselected network element.
  • the target network element is a network element in which the UE generates RLF.
  • Step 701 Reselect the network element, and send the radio link failure RLF indication information to the target network element according to the addressing information of the target network element carried in the connection establishment process.
  • the method of the present invention further includes: performing RRC re-establishment by the UE, and carrying the addressing information of the target network element, for example, carrying the target network element in the RRC re-establishment request message, or the RRC re-establishment complete message, etc., in the RRC re-establishment process.
  • Addressing information; the network element that is requested to be re-established by the RRC sends the RLF indication information to the target network element according to the addressing information of the carried target network element, for example, the network element that is requested to be re-established by the RRC receives the RRC re-establishment of the UE.
  • the request message, or the RRC re-establishment completion message, etc. can obtain the addressing information of the target network element.
  • the UE may perform a message by using a UE Information Response (UE Information Response) message, or an RRC setup request message, or an RRC setup complete message.
  • UE Information Response UE Information Response
  • the target network element is a network element in which the UE generates an RLF or a network element that is requested to be re-established by the RRC.
  • the reselected network element is a cell that the UE camps after the radio link fails.
  • the (target) network element is: a base station (including a home base station), or a radio network controller (RNC), or a base station controller (BSC).
  • a base station including a home base station
  • RNC radio network controller
  • BSC base station controller
  • the addressing information of the target network element is: Addressing information required to send the RLF indication information to the target network element:
  • the addressing information includes global base station identifier (Global eNB ID) and tracking area identifier (TAI) information, or information that can include the Global eNB ID and TAI content, such as ECGI and TAI information;
  • Global eNB ID global base station identifier
  • TAI tracking area identifier
  • the addressing information includes a Location Area Identity (LAI), a Routing Area Code (RAC), and a Base Station Controller Identity (RNC-ID).
  • LAI Location Area Identity
  • RAC Routing Area Code
  • RNC-ID Base Station Controller Identity
  • the addressing information is a cell global identity (CGI), where
  • the CGI is composed of a Public Land Mobile-Communication Network (PLMN) identity, a location area code (LAC), a cell identity (CI, cell identity), and a routing area code (RAC), where the RAC is optional.
  • PLMN Public Land Mobile-Communication Network
  • LAC location area code
  • CI cell identity
  • RAC routing area code
  • the method of the invention accurately transmits the RLF indication information to the target network element, ensures the implementation of the decision of the target network element to the handover scenario, and ensures that the network optimizes the specific handover parameters and the network self-optimization function is smooth. Implemented to improve network performance.
  • the method includes at least a UE, a target network element, and a reselected network element, where
  • the UE is configured to: in the process of establishing a connection with the reselected network element, transmit the addressing information of the target network element to the reselected network element;
  • Reselecting the network element in the process of establishing a connection with the UE, acquiring the addressing information of the target network element, and after the RRC is successfully established, sending the RLF indication information to the target network element;
  • the target network element is configured to receive the RLF indication information.
  • the system of the present invention further includes a network element that is requested to be re-established by the RRC, where
  • the UE is further configured to perform an RRC re-establishment process with the network element that is requested to be re-established by the RRC, and carry the addressing information of the target network element in the RRC re-establishment process;
  • the network element that is requested to be re-established by the RRC is configured to perform an RRC re-establishment process with the UE, obtain the addressing information of the target network element in the RRC re-establishment process, and send the RLF indication information to the target network element after the RRC re-establishment succeeds;
  • the target network element is further configured to receive RLF indication information from the network element that is requested to be re-established by the RRC, and complete the decision of the handover scenario.
  • the UE is further configured to be established with the reselected network element.
  • the addressing information of the target network element is transmitted to the reselected network element;
  • the reselecting the network element is further configured to: after the RRC is successfully established, send, to the network element that is requested to be re-established by the RRC, the RLF indication information, where the network element that is requested to be re-established by the RRC sends the RLF indication information to the target.
  • the second part of the RLF indication information of the network element is sent to the target network element.
  • the network element (including the target network element, the network element requesting RRC re-establishment, and the reselected network element) is a base station (eNodeB) (including a home base station) in the LTE system; an RNC in the UMTS system; and a RN system in the GSM system.
  • eNodeB base station
  • the element 1 is the eNB1 to which the cell1 belongs
  • the network element 2 is the eNB2 to which the cell2 belongs
  • the network element 3 is the eNB3 to which the cell3 belongs.
  • the RRC re-establishment of the UE in the LTE system is successful.
  • the address is transmitted by carrying the addressing information of the network element 2 in the RRC re-establishment request message. Addressing information of the network element.
  • the RRC re-establishment is performed by the UE1, and the UE sends an RRC re-establishment request message carrying the addressing information of the network element 2 to the network element 1, and the RRC establishment succeeds in the cell1;
  • the network element 1 sends the RLF indication information to the network element 2 according to the addressing information of the network element 2 carried in the RRC re-establishment request message, and the specific implementation includes: the network element 1 sends the RLF indication information to the core network (CN, Core Network), The CN sends the RLF indication information to the network element 2 according to the addressing information of the network element 2;
  • the core network CN, Core Network
  • the CN sends the RLF indication information to the network element 2 according to the addressing information of the network element 2;
  • the network element 2 determines a specific handover scenario according to the RLF indication information and the related UE context timer, for example, the handover is too late, or the handover is too early, or the handover to the wrong cell; the network side performs the optimization of the handover parameter according to the specific scenario of the handover. .
  • a specific handover scenario according to the RLF indication information and the related UE context timer, for example, the handover is too late, or the handover is too early, or the handover to the wrong cell; the network side performs the optimization of the handover parameter according to the specific scenario of the handover. .
  • the RRC re-establishment request message received by the network element 1 carries the addressing information of the network element 2, therefore, It also ensures that the network element 1 accurately transmits the RLF indication information to the network element 2.
  • the RRC re-establishment of the UE in the LTE system is successful.
  • the address is transmitted by carrying the addressing information of the network element 2 in the RRC re-establishment complete message. Addressing information of the network element.
  • the UE is in the connected state in the cell 2 under the network element 2, and the RLF (RLF occur) occurs due to poor radio link signal, handover failure or other reasons.
  • the UE selects the celll under the network element 1 for RRC. After the re-establishment, the UE sends an RRC re-establishment request message to the network element 1. After the RRC re-establishment is successful in the cell 1, the UE carries the addressing information of the network element 2 in the RRC re-establishment complete message sent to the network element 1.
  • the network element 1 may carry an indication in the RRC setup message (RRC setup), or the RRC reconfiguration message (RRC Connection Reconfiguration), or other downlink messages, to indicate whether the UE needs to report the addressing information of the network element 2 If necessary, the UE may obtain the addressing information of the network element 2 through the RRC re-establishment complete message or the RRC Connection Reconfiguration complete message.
  • RRC setup the RRC setup message
  • RRC Connection Reconfiguration RRC Connection Reconfiguration message
  • the network element 1 sends the RLF indication information to the network element 2 according to the addressing information of the network element 2 carried in the RRC re-establishment complete message, and the specific implementation includes: the network element 1 sends the RLF indication information to the CN, and the CN searches according to the network element 2.
  • the address information sends the RLF indication information to the network element 2; the network element 2 determines a specific handover scenario according to the RLF indication information and the related UE context timer, for example, the handover is too late, or the handover is too early, or the handover to the wrong cell;
  • the side optimizes the handover parameters according to the specific scenario of the handover. (The detailed implementation of the present invention is not intended to limit the scope of protection of the present invention as to how the decision and the optimization are made in the prior art.)
  • the RRC re-establishment is successful in the LTE system.
  • the network element 2 is carried in the UE Information Response message. Addressing information to convey addressing information of the target network element.
  • the specific implementation of the third embodiment is described as follows: Assume that the UE is in the connected state in the Cell 2 under the network element 2, and the UE selects the network element 1 because the radio link signal is poor, the handover fails, or other reasons cause the RLF to occur.
  • the RRC re-establishment is performed by the UE, and the UE sends an RRC re-establishment request message to the network element 1.
  • the UE After the RRC re-establishment succeeds in the cell1, the UE sends an RRC re-establishment complete message to the network element 1, and the RRC setup complete message is sent to the UE.
  • the UE carries an indication that the UE stores the RLF-related measurement information; the network element 1 sends a UE information request (UE Information Request) to the UE, and the UE is required to report the RLF-related measurement information, and the UE correlates the RLF through the UE Information Response (UE Information Response).
  • the measurement information and the addressing information of the network element 2 are reported to the network element 1.
  • the network element 1 may further carry an indication in the UE Information Request message that the UE is required to report the addressing information of the network element 2;
  • the network element 1 sends the RLF indication information to the network element 2 according to the addressing information of the network element 2 carried in the UE information response.
  • the specific implementation includes: the network element 1 sends the RLF indication information to the CN, and the CN according to the addressing information of the network element 2
  • the RLF indication information is sent to the network element 2; the network element 2 determines a specific handover scenario according to the RLF indication information and the related UE context timer, for example, the handover is too late, or the handover is too early, or the handover to the wrong cell; Switch the specific scenario to optimize the switching parameters.
  • the specific implementation of the present invention is not intended to limit the scope of the present invention.
  • the RRC setup request message or the RRC setup complete message, or the UE is used.
  • the Information Response message carries the addressing information of the network element 1 to deliver the addressing information of the target network element.
  • the UE is in the connected state in Cell 2 under the network element 2, and the RLF is generated due to poor radio link signal, handover failure or other reasons.
  • the UE selects cell1 for RRC re-establishment, and the UE sends RRC to the network element 1.
  • Re-establish the request message because there is no UE up and down in cell 1.
  • the RRC re-establishment of the UE in cell 1 fails, and the UE transitions to the idle state.
  • the UE reselects to the cell 3 through the cell reselection in the idle state, and sends an RRC setup request message to the network element 3, and the RRC establishment successfully enters the connected state.
  • the UE may obtain the addressing information of the network element 1 by reading the broadcast information of the cell1 during the RRC re-establishment process of the cell 1. After receiving the RRC re-establishment request message from the UE, the network element sends the radio link.
  • the failure indication RLF indication information is sent to the network element 2, indicating that the UE has an RLF, the RLF indication information includes the C-RNTI and the PCI obtained from the RRC re-establishment request message from the UE, and the UE selects to perform the RRC re-establishment attempt.
  • Celll's global identity ECGI can also be further carried with a short MAC integrity verification value (small MAC-I);
  • the network element 2 After receiving the RLF indication information, the network element 2 matches the C-RNTI and the PCI carried in the specific UE context; further, the short MAC-I can also be used for verification.
  • the network element 2 can determine a specific handover scenario according to the timer of the UE context and the last handover procedure of the UE.
  • the timer of the UE context has timed out, it can be determined that the handover from cell2 to cell1 is too late; if the timer of the UE context does not time out, and the source cell of the last handover process of the UE is celll, If it is determined that the UE context timer is not timed out, and the source cell of the last handover process of the UE is another cell, it is determined that the handover from the other cell to the cell 2 is Switching to the wrong cell; (The method of how to make the decision belongs to the prior art, and its specific implementation does not belong to the protection scope of the present invention, nor is it used to limit the scope of protection of the present invention.)
  • the network element 3 receives an RRC setup complete message from the UE, where the UE carries an indication that the UE stores the RLF related measurement information.
  • the UE 3 sends a UE Information Request message to the UE, and the UE is required to report the RLF-related measurement information.
  • the UE reports the RLF-related measurement information to the network element 3 through the UE Information Response message, where the UE Information Response message can further carry the UE in the celll.
  • the PCI, C-RNTI carried in the sent RRC re-establishment request message may further carry the Short MAC-I, and may further carry the ECGI of the cell1 that the UE performs the RRC re-establishment attempt for the first time after the RLF.
  • can be established in RRC The request message, or the RRC setup complete message, or the UE Information Response message, or the RRC Connection Reconfiguration Complete message carries the addressing information of the network element 1.
  • the network element 3 may carry an indication in the RRC setup message (RRC setup) or the UE information request or the RRC connection reconfiguration (RRC Connection Reconfiguration) or other downlink message, to indicate whether the UE needs to report the search of the network element 1 Address information, if necessary, the UE obtains the addressing information of the message network element 1 through the RRC setup complete message, or the UE Information Response message, or the RRC reconfiguration completion message;
  • the network element 3 sends the RLF indication information to the CN, and the CN sends the RLF indication information to the network element 1 according to the addressing information of the network element 1.
  • the RLF indication information includes the C-RNTI and the PCI carried in the RRC re-establishment request message, and may further carry the Short MAC-I, and may further carry the ECGI of the cell1 that the UE selects to perform the RRC re-establishment attempt, and may further Carrying the RLF related measurement information reported by the UE, and further carrying the identifier for identifying the second part of the RLF indication;
  • the network element 1 receives the RLF indication information from the network element 3, and sends it to the network element 2 as the second part of the RLF indication information that the network element 1 itself sends to the network element 2.
  • the network element 2 determines whether to switch the parameter problem or the coverage problem according to the RLF related measurement information carried therein. For example, the signal quality of the serving cell and the best surrounding cell are relatively poor, indicating that there may be coverage holes and the like. (The specific implementation is not within the scope of the present invention as to how it is determined to be prior art, nor is it intended to limit the scope of protection of the present invention.)
  • the RRC re-establishment fails, and the RRC establishment is successful in the LTE system.
  • the RRC setup request message, or the RRC setup complete message, or the UE is used.
  • the Information Response message or other uplink message carries the addressing information of the network element 2 to deliver the addressing information of the target network element.
  • the specific implementation of the fifth embodiment is described as follows: It is assumed that the UE is in the connected state in Cell 2 under the network element 2, and the RLF is generated due to poor radio link signal, handover failure or other reasons.
  • the UE selects cell1 for RRC re-establishment, and the UE sends an RRC re-establishment request.
  • the message is sent to the network element 1. Since there is no context context of the UE in the cell 1, the RRC re-establishment of the UE in the cell 1 fails, and the UE transits to the idle state. Alternatively, the UE selects the cell1 but does not initiate the RRC re-establishment request and directly transfers to the idle state. For example, cell1 is an inter-system cell. The UE reselects to the cell 3 through the cell reselection in the idle state, and sends an RRC setup request message to the network element 3, and the UE successfully enters the connected state by performing RRC establishment;
  • the network element 3 receives an RRC setup complete message from the UE, where the UE carries an indication that the UE stores the RLF related measurement information.
  • the network element 3 sends a UE Information Request message to the UE, and the UE reports the RLF related measurement information, and the UE reports the RLF related measurement information to the network element 3 through the UE Information Response message.
  • the UE Information Response message may further carry the PCI, C-RNTI, and Short MAC-I carried in the RRC re-establishment request message sent by the UE in the cell1, where the PCI is the PCI2, C-RNTI, and Short MAC of the cell2.
  • -I is the parameter associated with the UE in cell2.
  • the UE may further carry the global identifier of the cell 1 that is selected by the UE for the first time after the RLF, and may further carry the time difference that the UE switches to the cell cell 2 and initiates the RRC re-establishment in the cell l, and may further carry the UE.
  • the addressing information of the network element 2 may be carried in the RRC setup request message, or the RRC setup complete message, or the UE Information Response message, or the RRC reconfiguration complete message or other uplink message, where the addressing information of the network element 2 is It may be obtained by the UE by reading the broadcast information of the cell 2.
  • the network element 3 may carry an indication in the RRC setup message (RRC setup), or the UE Information Request message, or the RRC reconfiguration message, or other downlink message, to indicate whether the UE needs to report the addressing of the network element 2 Information, if necessary, the UE may report the addressing information of the network element 2 through the RRC setup complete message, or the UE Information Response message, or the RRC reconfiguration complete message or other uplink message;
  • RRC setup RRC setup
  • the UE Information Request message or the RRC reconfiguration message, or other downlink message
  • the network element 3 sends the RLF indication information to the CN, and the CN according to the addressing information of the network element 2
  • the RLF indication information is sent to the network element 2.
  • the RLF indication information includes the C-RNTI and the PCI obtained from the RRC re-establishment request message, and may further carry the Short MAC-I, and may further carry the global identifier of the cell1 that the UE selects to perform the RRC re-establishment attempt, and further
  • the RLF-related measurement information that is reported by the UE may be further carried, and may further carry the time difference that the UE switches to the cell 2 and attempts to initiate the RRC re-establishment request in the cell 1, and may further carry the global identifier of the cell that the UE camps on before the cell 2;
  • the network element 2 After receiving the RLF indication information, the network element 2 matches the C-RNTI and the PCI carried in the specific UE context; further, the short MAC-I can also be used for verification.
  • the network element 2 can determine a specific handover scenario according to the timer with the UE context and the time difference between the UE switching to the cell cell2 and attempting to initiate an RRC re-establishment request in the celll.
  • the timer of the UE context is less than the time difference, it can be determined that the handover from cell2 to cell1 is too late; if the timer of the UE context is greater than the time difference, and the source cell of the last handover procedure of the UE is Celll, it is judged that this is a switch from celll to cell2 too early; if the UE context timer is greater than the time difference, and the source cell of the last handover process of the UE is other cell cell 4, it is judged from the other cell The cell 4 to cell 2 handover is switched to the wrong cell.
  • the network element 2 can also determine whether to switch parameter problems or coverage problems according to the RLF related measurement information in the RLF indication information. For example, the signal quality of the serving cell and the best surrounding cell are relatively poor, indicating that there may be coverage holes and the like. (The specific implementation is not within the scope of protection of the present invention as to how it is determined to belong to the prior art, nor is it intended to limit the scope of protection of the present invention.)
  • the sixth embodiment in conjunction with the handover scenario shown in FIG. 4, assumes that the RRC re-establishment of the UE in the UMTS system is successful, and the specific implementation is described as follows: It is assumed that the UE is in the connected state in the cell 2 of the network element 2, and the RLF is generated due to poor radio link signal, handover failure, or other reasons. The UE selects the cell1 of the UMTS system to perform RRC re-establishment, and the UE moves to the network element 1.
  • the network element 1 sends a cell update confirm message to the UE, and the UE returns a reconfiguration complete message, that is, a radio bearer configuration completion (Radio Bearer Reconfiguration Complete) message or The transport channel reconfiguration complete message or the hysical channel reconfiguration complete message is successfully established.
  • the UE may carry the addressing information of the network element 2 in the cell update message, or the radio bearer reconfiguration complete message, the transport channel reconfiguration complete message, and the physical channel reconfiguration complete message;
  • the network element 1 may carry an indication in the cell update confirm message or other downlink message, to indicate whether the UE needs to report the addressing information of the network element 2, and if necessary, the UE reports the addressing information of the network element 2;
  • the network element 1 sends the RLF indication information to the network element 2 according to the addressing information of the network element 2.
  • the specific implementation includes: the network element 1 sends the RLF indication information to the CN, and the CN sends the RLF indication information to the network element 2 according to the addressing information of the network element 2;
  • the network element 2 determines a specific handover scenario according to the RLF indication and the related UE context timer, for example, the handover is too late, the handover is too early, and the handover to the error cell; the network side performs the optimization of the handover parameters according to the specific scenario of the handover.
  • the specific implementation of the present invention is not intended to limit the scope of protection of the present invention as to how to make decisions and optimize the prior art.
  • the RRC establishment is successful in the UMTS system.
  • the UE reports the addressing information of the network element 1.
  • the UE is in the connected state in the Cell 2 under the network element 2, and the UE selects the celll of the UMTS system because the radio link signal is poor, the handover fails, or other reasons cause the RLF to occur.
  • the RRC re-establishment is performed, and the re-establishment fails or the re-establishment attempt is not initiated for various reasons.
  • the network element 1 sends the RLF indication information to the network element 2, and the RLF indication information includes the context of the UE, the cell information of the RLF, the cell information of the RRC re-establishment attempt, and the like; subsequently, the UE transits to the idle state, and the cell reselects.
  • the RRC setup is initiated and established successfully.
  • the UE may carry the addressing information of the network element 1 in the cell update message, or the RRC setup request message, or the RRC setup message, or the UE Information Response message, or other uplink message;
  • the network element 3 may carry an indication in the RRC setup message (RRC setup), or the UE information request or other downlink message, to indicate whether the UE needs to report the addressing information of the network element 1, and if necessary, the UE reports Addressing information of network element 1;
  • the network element 3 sends the RLF indication information to the network element 1 according to the addressing information of the network element 1, and specifically includes: the network element 3 sends the RLF indication information to the CN, and the CN sends the RLF indication information to the network according to the addressing information of the network element 1. Yuan 1. The network element 1 then sends this part of the content as the second part of the RLF indication information to the network element 2;
  • the network element 2 decides a specific handover scenario according to the RLF indication and the related UE context timer, for example, the handover is too late, the handover is too early, and the handover to the wrong cell.
  • the network side optimizes the handover parameters according to the specific scenario of the handover. (The specific implementation of the present invention is not intended to limit the scope of protection of the present invention as to how to make decisions and optimize the prior art.)
  • the RRC establishment is successful in the UMTS system.
  • the UE reports the addressing information of the network element 2.
  • the UE is in the connected state in the Cell 2 under the network element 2, and the RLF is generated due to poor radio link signal, handover failure or other reasons.
  • the UE selects the celll of the UMTS system for RRC re-establishment, for various reasons.
  • the re-establishment failed or did not initiate a re-establishment attempt.
  • the UE transits to the idle state, and the cell is reselected into the cell 3; subsequently, the RRC establishment is initiated and the establishment is successful.
  • UE can Carrying the addressing information of the network element 2 in the RRC setup request message, or the RRC setup complete message, or the UE Information Response message;
  • the network element 3 may carry an indication in the RRC setup message (RRC setup), or the UE information request or other downlink message, to indicate whether the UE needs to report the addressing information of the network element 2, and if necessary, the UE reports Addressing information of network element 2;
  • the network element 3 sends the RLF indication information to the network element 2 according to the addressing information of the network element 2, and specifically includes: the network element 3 sends the RLF indication information to the CN, and the core network sends the RLF indication information to the network element according to the addressing information of the network element 2.
  • the network element 2 decides a specific handover scenario according to the RLF indication and the related UE context timer, for example, the handover is too late, the handover is too early, and the handover to the wrong cell.
  • the network side optimizes the handover parameters according to the specific scenario of the handover. (The specific implementation of the present invention is not intended to limit the scope of protection of the present invention as to how to make decisions and optimize the prior art.)
  • the RLF related measurement information in the foregoing embodiment of the present invention is: a signal quality measurement result of the serving cell and the best surrounding cell before the RLF occurs, a serving cell and a best surrounding cell measured by the UE when the re-establishment is subsequently initiated.

Landscapes

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

Description

切换场景判决过程中确定目标网元的方法及系统 技术领域
本发明涉及移动通信系统中的切换技术， 尤指一种切换场景判决过程 中确定目标网元的方法及系统。 背景技术
长期演进（LTE, Long Term Evolution ) 网络由演进的通用地面无线接 入网 （E-UTRAN, Evolved UTR AN )、 演进基站 （eNB, Evolved NodeB ) 和演进分组交换中心 （EPC, Evolved Packet Core )组成， 网络扁平化。 其 中， E-UTRAN包含和 EPC通过 S1接口连接的 eNB的集合， eNB之间能 通过 X2连接。 S1接口、 X2接口是逻辑接口。 一个 EPC可以管理一个或多 个 eNB,—个 eNB也可以受控于多个 EPC,—个 eNB可以管理一个或多个 小区。
自组网 （SON )是一种自动进行网络配置和优化的技术。 SON技术的 特点是自配置自优化， 该技术在 LTE中的应用， 使得 LTE基站 （即 eNB ) 可以根据一定的测量自动配置网络参数， 并根据网络变化进行自动优化， 从而保持网络性能最优， 同时节约大量的人力物力。
对于 LTE系统的切换参数自优化来说， 需要根据网络的运行状况、 切 换相关的测量， 按照一定的算法来优化小区重选和切换相关的参数， 以提 高网络的性能。 这里的切换包括 LTE系统内部的切换和系统间的切换， 其 中，系统间的切换是指到通用地面无线接入网（ UTRAN, Universal Terrestrial Radio Access Network ) 或全球移动通信系统 （GSM , Global System For Mobile Communication )或码分多址( CDMA, Code Division Multiple Access ) 系统的切换。 在网络中终端进行切换的过程大致包括： 网络侧根据终端上报的本小 区和邻区的信号质量、 以及基于一定的切换算法做出的切换决策， 然后再 根据切换决策通知终端进行具体的切换流程的执行。 在切换过程中， 不合 适的切换参数的设置会导致乒乓切换、 切换失败或无线链路失败（RLF, Radio Link Failure )等不良切换结果， 这些都是不期望的切换， 对用户的体 验造成了负面影响并且浪费了网络资源。 因此， 对于切换参数自优化来说， 对切换失败或者不期望的切换场景的准确判断是进行切换参数调整的基 础。
用户设备（UE, User Equipment )在无线链路信号很差或切换 失 败 时， 会发生无线链路失败（RLF, radio link failure ), 并进行无线资源控制 ( RRC, Radio Resource Control )的重建立。 UE在进行 RRC重建立时， 通 过小区选择的程序来获得目标小区。 在切换过程中发生的切换失败， 源基 站或目标基站会保留用户的信息， 用于 RRC重建立。 UE在 RRC的重建立 的请求消息中， 会携带终端标识（UE ID, UE-Identity )、 UE在小区的无线 网络临时标 i只 ( C-RNTI, Cell Radio Network Temporary Identifier ), 短的 MAC完整性验证值 ( short MAC-I, short Medium Access Control integrity protection )和小区物理地址（PCI, Physical Cell Identity )„ 其中， C-RNTI 是在源小区分配的 （切换失败的场景）， 或者是在触发 RRC重建的小区里 分配的（其它场景）； PCI是指源小区的物理地址（切换失败的场景）， 或者 是在触发 RRC重建立的小区的物理地址 (其它场景）； 短的 MAC完整性验 证值的计算是釆用源小区的（切换失败的场景）或者是在触发 RRC重建的 小区的 KRRCint key和完整性保护算法， 其中， KRRCint key是 RRC完整性算 法需要的密钥，输入是 PCI、 C-RNTI和演进的全球小区标识（ ECGI, Evolved Cell Global Identifier ), 其中， PCI、 C-RNTI是上述在 RRC重建消息中携带 的， ECGI是 UE在 RRC重建时选择的目标小区的 ECGI。
图 1为一种切换过晚的场景的示意图，如图 1所示， UE在 eNB B下的 小区 b ( Cell b )中发生了 RLF, 或者在从 cell b到小区 a ( cell a )的切换过 程中失败； 然后， UE再在 eNB A下的 Cell a中尝试进行 RRC重建。 图 1 所示说明了该 UE从小区 Cell b到小区 Cell a的切换过晚。
图 2为一种切换过早的场景的示意图，如图 2所示， UE从 eNB A下的 Cell a中切换到 eNB B下的小区 Cell b后不久，在 Cell b中发生了无线链路 失败， 或者在从 cell a到 cell b的切换过程中失败； 然后， UE选择了小区 Cell a进行 RRC重建， 也就是又回到切换前的小区中进行 RRC重建。 图 2 所示说明了该 UE从 Cell a到 Cell b的切换过早。
图 3为一种切换选择错误小区的场景的示意图，如图 3所示，UE从 eNB C下的小区 c ( Cell c )切换到 eNB B下的 Cell b之后不久， 发生了 RLF, 或者在从 cell c到 cell b的切换过程中失败； 然后， UE在 eNB A下的小区 Cell a进行 RRC重建。 图 3所示说明了选择的 eNB B下的 Cell b是错误的 目标小区， 正确的目标小区为 Cell a, 也就是 UE应该直接进行从 Cell c到 Cell a的切换。
现有技术中， 对切换场景的判决方式有下述方式：
一种切换场景是： UE在 eNB2下的 cell2中发生了 RLF, 然后选择了 eNB 1下的 celll中进行 RRC重建立成功。 判决方式大致包括：
UE发送 RRC重建立请求消息到 eNBl, 则 eNBl发送 RLF指示（ RLF indication )信息到 eNB2, 在 RLF indication信息中可选的包含有 cell2的 PCI, UE在 cell2中的 C-RNTI, celll的 ECGI; 可选的， 还可以进一步携 带短介质接入控制完整性验证值（short MAC-I )和 UE测量的无线链路失 败相关的才艮告信息 （UE RLF Report Container ), 其中， UE RLF Report Container是指 UE保存并上报的 UE在 RLF之前或之后测量的服务小区和 周围小区的信号质量；
eNB2收到 RLF indication信息后， 根据其中的 UE的上下文（ context ) 信息， 即釆用 PCI和 C-RNTI来匹配 UE, 并可利用 short MAC-I进行验证。 若存在 UE从 celll切换到 cell2后开启的定时器， 则判断出该 UE从 celll 到 cell2的切换过早； 若存在 UE从 cell3切换到 cell2后开启的定时器， 则 判断出该 UE从 cell3到 cell2的切换是选择了错误小区。 并发送切换报告 ( handover report ) 消息到相应的 eNB。 否则， 判断出 UE从 cell2到 celll 的切换过晚。
在上述过程中， RLF indication信息发送的目标 eNB是 eNBl根据接收 到的 UE的 RRC重建立请求消息中的 PCI来映射的，其前提是 eNBl和 eNB2 之间已建立 X2接口， 这样， eNBl才能根据 cell2的 PCI信息能够映射出 eNB2的全局基站标识（ Global eNB ID ),从而可以发送 RLF indication信息 到 eNB2。 如果 eNBl和 eNB2之间没有建立 X2接口， 且 celll没有将 cell2 配置为邻区， 那么， eNBl是不能根据 cell2的 PCI信息映射出 eNB2的全 球标识和 TAI信息的， 当然也就无法寻址到目标 eNB。
还有一种切换场景如图 4所示： UE在 eNB2下的 cell 2中发生 RLF并 在 eNBl下的 celll中进行 RRC重建立失败， UE转入空闲 （Idle ) 态， 小 区重选到 eNB3下的 cell3中并进行 RRC建立成功。对于图 4所示的切换场 景， 其中一种判决方式如图 5所示， 判决方式大致包括：
eNBl收到 UE的 RRC重建立请求（ RRC reestablish )消息后，发送 RLF indication信息到 eNB2, eNB2根据 RLF indication判决是切换过早、 或是 切换过晚、还是选择了错误小区； eNB3在收到 UE的 RRC建立完成（ RRC establish ) 消息后， 根据其中的 RLF测量信息指示， 向 UE发起 RLF测量 信息获取请求， UE上报 RLF测量信息； eNB3再通过 RLF indication信息， 将得到的 RLF测量信息和 UE的标识信息发给 eNBl , eNBl将来自 eNB3 的 RLF indication信息作为自身再次发送给 eNB2的 RLF indication信息的 第二部分发送到 eNB2, eNB2根据其中的 RLF测量信息来判决是否是覆盖 问题。
另一种判决方式如图 6所示， 判决方式大致包括： eNB3将得到的 RLF测量信息和 UE的标识信息直接发给 eNB 2, 其中 含有 UE从上一次切换到第一次 RRC重建立尝试间的时间差， eNB 2判决 是切换问题还是覆盖问题，若是切换问题，则根据 UE从上一次切换到第一 次 RRC重建立尝试间的时间差判决具体的切换场景， 如切换过晚、 或切换 过早、 或切换到了错误小区。
上述图 5和图 4两种判决方式中，在 eNB3发送 RLF indication信息时， 都存在着如何寻址的问题， 如果 eNB3与 eNBl或 eNB2没有 X2接口， 且 cell3与 celll或 cell2不是邻区， 那么， eNB3仅根据 PCI或 ECGI是不能寻 址到 eNBl或 eNB2的，从而无法准确向目标基站发送 RLF indication信息。
从现有技术中提供的切换过程可见， 由于存在不能唯一确定发送 RLF indication信息的目标网元（如上述目标基站） 的寻址信息， 那么， 无法保 证目标网元根据 RLF indication相关信息， 判决出是何种切换场景的实现， 也不能保证在此基础上网络对具体的切换参数进行优化的实现， 妨碍了网 络的自优化功能的顺利实现， 从而降低了网络性能。 发明内容
有鉴于此， 本发明的主要目的在于提供一种切换场景判决过程中确定 目标网元的方法及系统， 能够唯一确定发送 RLF indication信息的目标网元 的寻址信息， 保证目标网元对切换场景的判决的实现， 并保证网络对具体 的切换参数进行优化的实现以及网络的自优化功能的顺利实现， 从而提高 网络性能。
为达到上述目的， 本发明的技术方案是这样实现的：
一种切换场景判决过程中确定目标网元的方法， 在小区重选后， 包括： 用户设备 UE与重选网元建立连接过程中， 携带目标网元的寻址信息；
重选网元， 根据建立连接过程中携带的目标网元的寻址信息， 向目标 网元发送无线链路失败 RLF指示信息。 该方法之前还包括：
所述 UE进行无线资源控制 RRC重建立，并在 RRC重建立过程中，携 带目标网元的寻址信息；
被请求 RRC重建立的网元， 根据携带的目标网元的寻址信息， 向目标 网元发送 RLF指示信息。
所述目标网元为 UE发生 RLF的网元； 所述向目标网元发送 RLF指示 信息包括：
所述重选网元经由核心网向所述 UE发生 RLF的网元发送 RLF指示信 息。
如果所述 UE重建立失败， 在小区重选后， 该方法还包括： 所述 UE与 重选网元建立连接过程中， 携带目标网元的寻址信息； 重选网元， 根据建 立连接过程中携带的目标网元的寻址信息，向目标网元发送 RLF指示信息； 所述目标网元为 UE发生 RLF的网元或被请求 RRC重建立的网元。 在所述与重选网元建立连接过程中， 所述目标网元的寻址信息携带在 UE信息响应消息， 或 RRC建立请求消息， 或 RRC建立完成消息中。
所述目标网元的寻址信息携带在 RRC重建立请求消息、 或 RRC重建 立完成消息、 或 UE信息响应消息中。
该方法还包括：
所述被请求 RRC重建立的网元在 RRC重建立消息、 或 RRC重配置消 息、或其它下行消息中携带一个指示，用于指示 UE是否需要上报目标网元 的寻址信息；
在所述指示显示需要上报目标网元的寻址信息时， 所述 UE通过 RRC 重建立完成消息、 或 RRC重配置完成消息携带目标网元的寻址信息。
所述 RRC重建立过程成功完成时， 该方法还包括：
所述 UE在发送给所述被请求 RRC重建立的网元的 RRC建立完成消息 中携带有 UE保存有 RLF相关测量信息的指示； 所述被请求 RRC重建立的网元给 UE发送 UE信息请求消息， 要求所 述 UE上艮 RLF相关测量信息；
所述 UE通过 UE信息响应消息将 RLF相关测量信息及目标网元的寻 址信息上报至所述被请求 RRC重建立的网元。
所述被请求 RRC重建立的网元还进一步在 UE信息请求消息中携带一 个指示， 用于指示 UE上报目标网元的寻址信息。
在所述与重选网元建立连接过程中， 所述目标网元的寻址信息携带在 RRC建立请求消息、 或 RRC建立完成消息、 或 UE信息响应消息、 或 RRC 重配置完成消息或其它上行消息中。
该方法还包括： 所述重选网元在 RRC建立消息、或 UE信息请求消息、 或 RRC重配置消息、 或其它下行消息中携带一个指示， 用于指示 UE是否 需要上报目标网元的寻址信息。
所述目标网元为被请求 RRC重建立的网元； 所述向目标网元发送 RLF 指示信息包括：
所述重选网元经由核心网向所述被请求 RRC 重建立的网元发送 RLF 指示信息；所述被请求 RRC重建立的网元将接收到的 RLF指示信息作为自 身发送给目标网元的 RLF指示信息的第二部分发送给目标网元。
所述目标网元、 或被请求 RRC 重建立的网元、 或重选网元为： 基站 / 家庭基站、 或无线网络控制器 RNC、 或基站控制器 BSC。
所述目标网元的寻址信息为发送 RLF指示信息到目标网元所需要的寻 址信息， 具体为：
当所述目标网元为长期演进 LTE基站时， 所述寻址信息包含全局基站 标识和跟踪区域标识 TAI信息， 或者， 能包含所述全局基站标识和 TAI内 容的信息；
当所述目标网元为通用移动通信系统 UMTS中的 RNC时，所述寻址信 息包含位置区标识 LAI、 路由区域码 RAC、 基站控制器标识、 扩展基站控 制器标识中的一项或多项；
当所述目标网元为全球移动通信 GSM系统中的基站控制器时，所述寻 址信息为小区全球标识 CGI。
一种切换场景判决过程中确定目标网元的系统， 至少包括 UE、 目标网 元和重选网元， 其中，
所述 UE, 用于在与重选网元建立连接过程中， 将目标网元的寻址信息 传递给重选网元；
重选网元， 用于在与 UE建立连接过程中， 获取目标网元的寻址信息， 在 RRC建立成功后， 向目标网元发送 RLF指示信息；
目标网元， 用于接收 RLF指示信息。
所述系统还包括被请求 RRC重建立的网元， 其中，
UE,还用于与被请求 RRC重建立的网元进行 RRC重建立过程，在 RRC 重建立过程中携带目标网元的寻址信息；
被请求 RRC重建立的网元，用于与 UE进行 RRC重建立过程，在 RRC 重建立过程获取目标网元的寻址信息， RRC重建立成功后， 向目标网元发 送 RLF indication信息；
目标网元，还用于接收来自被请求 RRC重建立的网元的 RLF indication 信息， 并完成切换场景的判决。
在所述 UE重建立失败时，
所述 UE, 还用于在与所述重选网元建立连接过程中， 将目标网元的寻 址信息传递给重选网元；
重选网元， 还用于在 RRC建立成功后， 向所述被请求 RRC重建立的 网元发送 RLF指示信息， 所述被请求 RRC重建立的网元再将该 RLF指示 信息作为发送给目标网元的 RLF指示信息的第二部分发送给目标网元。
在 LTE系统中， 所述目标网元、 或请求 RRC重建立的网元、 或重选网 元为基站 /家庭基站； 在 UMTS系统中， 所述目标网元、 或请求 RRC重建立的网元、 或重选 网元为 RNC;
在 GSM系统中， 所述目标网元、 或请求 RRC重建立的网元、 或重选 网元为 BSC。
从上述本发明提供的技术方案可以看出， 包括在小区重选后， 用户设 备（UE ) 与重选网元建立连接过程中， 携带目标网元的寻址信息； 重选网 元， 根据建立连接过程中携带的目标网元的寻址信息， 向目标网元发送无 线链路失败 RLF指示信息。 通过本发明方法， 准确发送了无线链路失败指 示信息到目标网元， 保证了目标网元对切换场景的判决的实现， 并保证了 网络对具体的切换参数进行优化的实现以及网络的自优化功能的顺利实 现， 从而提高了网络性能。 附图说明
图 1为一种切换过晚的场景的示意图；
图 2为一种切换过早的场景的示意图；
图 3为一种切换选择错误小区的场景的示意图；
图 4为一种切换场景的示意图；
图 5为图 4所示的切换场景的一种判决方式的示意图；
图 6为图 4所示的切换场景的另一种判决方式的示意图；
图 7为本发明切换场景判决过程中确定目标网元的方法的流程图； 图 8为本发明切换场景判决过程中确定目标网元的系统的组成结构示 意图。 具体实施方式
图 7为本发明切换场景判决过程中确定目标网元的方法的流程图， 如 图 7所示， 包括： 步骤 700: 在小区重选后， UE与重选网元建立连接过程中， 携带目标 网元的寻址信息。 目标网元为 UE发生 RLF的网元。
步骤 701：重选网元，根据建立连接过程中携带的目标网元的寻址信息， 向目标网元发送无线链路失败 RLF指示信息。
本发明方法之前还包括： UE进行 RRC重建立， 并在 RRC重建立过程 中， 携带目标网元的寻址信息， 比如在 RRC重建立请求消息、 或 RRC重 建立完成消息等中携带目标网元的寻址信息； 被请求 RRC重建立的网元， 根据携带的目标网元的寻址信息， 向目标网元发送 RLF indication信息， 比 如被请求 RRC重建立的网元接收到 UE的 RRC重建立请求消息、 或 RRC 重建立完成消息等， 即可获得目标网元的寻址信息。
进一步地， 如果 UE重建立失败， 在小区重选后， 与重选网元建立连接 过程中， UE可以通过 UE信息响应 （UE Information Response ) 消息， 或 RRC建立请求消息， 或 RRC建立完成消息携带目标网元的寻址信息； 接收 到 UE Information Response消息、 或 RRC建立请求消息、 或 RRC建立完 成消息的重选网元， 根据其中携带的目标网元的寻址信息， 向目标网元发 送 RLF indication信息。 此时， 目标网元为 UE发生 RLF的网元或被请求 RRC重建立的网元。
进一步地， 如果 UE没有进行小区重选， 所述重选网元为 UE在无线链 路失败后驻留的小区。
其中，（目标）网元为：基站（包括家庭基站）、或无线网络控制器（RNC, Radio Network Controller )、 或基站控制器（ BSC, Base Station Controller )。
目标网元的寻址信息为： 发送 RLF indication信息到目标网元所需要的 寻址信息：
当目标网元为 LTE基站时， 寻址信息包含全局基站标识 （Global eNB ID )和跟踪区域标识（TAI )信息， 或者能包含所述 Global eNB ID和 TAI 内容的信息 , 比如 ECGI和 TAI信息； 当目标网元为通用移动通信系统（ UMTS )中的无线网络控制器（ RNC ) 时， 寻址信息包含位置区标识（LAI )、 路由区域码（RAC )、 基站控制器标 识（ RNC-ID )、扩展基站控制器标识（ Extended RNC-ID )中的一项或多项； 当目标网元为 GSM系统中的基站控制器时，寻址信息为小区全球标识 ( CGI, cell global identity ), 其中， CGI由公众陆地移动通信网 （PLMN, Public Land Mobile-communication Network ) identity、 位置区码 ( LAC )、 小 区标识（ CI, cell identity )、路由区域码 ( RAC )组成， 其中 RAC为可选项。
通过本发明方法， 准确发送了 RLF indication信息到目标网元， 保证了 目标网元对切换场景的判决的实现， 并保证了网络对具体的切换参数进行 优化的实现以及网络的自优化功能的顺利实现， 从而提高了网络性能。
针对本发明方法， 还提供一种切换场景判决过程中确定目标网元的系 统， 如图 8所示， 至少包括 UE、 目标网元和重选网元， 其中，
UE, 用于在与重选网元建立连接过程中， 将目标网元的寻址信息传递 给重选网元；
重选网元， 用于在与 UE建立连接过程中， 获取目标网元的寻址信息， 在 RRC建立成功后， 向目标网元发送 RLF指示信息；
目标网元， 用于接收 RLF指示信息。
本发明系统还包括被请求 RRC重建立的网元， 其中，
UE,还用于与被请求 RRC重建立的网元进行 RRC重建立过程，在 RRC 重建立过程中携带目标网元的寻址信息；
被请求 RRC重建立的网元，用于与 UE进行 RRC重建立过程，在 RRC 重建立过程获取目标网元的寻址信息， RRC重建立成功后， 向目标网元发 送 RLF indication信息；
目标网元，还用于接收来自被请求 RRC重建立的网元的 RLF indication 信息， 并完成切换场景的判决。
在 UE重建立失败时， 进一步地， UE, 还用于在与所述重选网元建立 连接过程中， 将目标网元的寻址信息传递给重选网元；
重选网元， 还用于在 RRC建立成功后， 向所述被请求 RRC重建立的 网元发送 RLF指示信息， 所述被请求 RRC重建立的网元再将该 RLF指示 信息作为发送给目标网元的 RLF指示信息的第二部分发送给目标网元。
其中， 网元（包括目标网元、 请求 RRC重建立的网元、 重选网元）在 LTE系统中为基站（ eNodeB ) (包括家庭基站 ); 在 UMTS系统中为 RNC; 在 GSM系统中为 BSC。 元 1为 celll所属的 eNBl , 网元 2为 cell2所属的 eNB2, 网元 3为 cell3所 属的 eNB3。
第一实施例， 结合图 4所示的切换场景， 4叚设 UE在 LTE系统中 RRC 重建立成功， 本实施例中通过在 RRC重建立请求消息中携带网元 2的寻址 信息来传递目标网元的寻址信息。 第一实施例的具体实现描述如下：
假设 UE在网元 2所辖的 Cell2中处于连接态，由于无线链路信号很差、 切换失败或其它原因导致发生了无线链路失败（RLF, radio link failure ), UE选择了网元 1所辖的 celll进行 RRC重建立， UE向网元 1发送携带有 网元 2的寻址信息的 RRC重建立请求消息， 并在 celll中进行 RRC建立成 功；
网元 1根据 RRC重建立请求消息中携带的网元 2的寻址信息， 发送 RLF indication信息到网元 2, 具体实现包括： 网元 1发送 RLF indication 信息到核心网 （CN, Core Network ), CN根据网元 2 的寻址信息将 RLF indication信息发送到网元 2;
网元 2根据 RLF indication信息和相关 UE context定时器来判决具体的 切换场景， 例如， 切换过晚、 或切换过早、 或切换到了错误小区； 网络侧 根据切换的具体场景来进行切换参数的优化。 （关于如何进行判决及优化属 于现有技术， 其具体实现不属于本发明的保护范围， 也不用于限定本发明 的保护范围。）
从第一实施例的实现可以看出，即使网元 1与网元 2之间没有 X2接口， 由于网元 1接收到的 RRC重建立请求消息中携带有网元 2的寻址信息，因 此， 也确保了网元 1准确将 RLF indication信息发送给网元 2。
第二实施例， 结合图 4所示的切换场景， 4叚设 UE在 LTE系统中 RRC 重建立成功， 本实施例中通过在 RRC重建立完成消息中携带网元 2的寻址 信息来传递目标网元的寻址信息。 第二实施例的具体实现描述如下：
假设 UE在网元 2所辖的 Cell 2中处于连接态，由于无线链路信号很差、 切换失败或其它原因导致发生了 RLF ( RLF occur ) , UE选择了网元 1所 辖的 celll进行 RRC重建立， UE向网元 1发送 RRC重建立请求消息， 在 celll中进行 RRC重建立成功后， UE在发送给网元 1的 RRC重建立完成消 息中携带有网元 2的寻址信息。进一步地，网元 1可以在 RRC建立消息（ RRC setup )、 或 RRC重配置消息 （ RRC Connection Reconfiguration )、 或其它下 行消息中携带一个指示，用于指示 UE是否需要上报网元 2的寻址信息，若 需要， 则 UE可以通过 RRC 重建立完成消息或 RRC 重配置完成（RRC Connection Reconfiguration complete ) 消息上才艮网元 2的寻址信息；
网元 1根据 RRC重建立完成消息中携带的网元 2的寻址信息， 发送 RLF indication信息到网元 2, 具体实现包括： 网元 1发送 RLF indication 信息到 CN, CN根据网元 2的寻址信息将 RLF indication信息发送到网元 2; 网元 2根据 RLF indication信息和相关 UE context定时器来判决具体的 切换场景， 例如， 切换过晚、 或切换过早、 或切换到了错误小区； 网络侧 根据切换的具体场景来进行切换参数的优化。 （关于如何进行判决及优化属 于现有技术， 其具体实现不属于本发明的保护范围， 也不用于限定本发明 的保护范围。）
第三实施例， 结合图 4所示的切换场景， 4叚设 UE在 LTE系统中 RRC 重建立成功，本实施例中通过在 UE Information Response消息中携带网元 2 的寻址信息来传递目标网元的寻址信息。 第三实施例的具体实现描述如下： 假设 UE在网元 2所辖的 Cell 2中处于连接态， 由于无线链路信号很 差、 切换失败或其它原因导致发生了 RLF, UE选择了网元 1所辖的 celll 进行 RRC重建立， UE向网元 1发送 RRC重建立请求消息， 在 celll中进 行 RRC重建立成功后， UE向网元 1发送 RRC重建立完成消息， 在 UE的 RRC建立完成消息中， 携带有 UE保存有 RLF相关测量信息的指示； 网元 1给 UE发送 UE信息请求 （ UE Information Request ), 要求 UE上报 RLF 相关测量信息， UE通过 UE信息响应 （UE Information Response )将 RLF 相关测量信息及网元 2的寻址信息上报至网元 1。 进一步地， 网元 1还可 以在 UE Information Request消息中携带一个指示要求 UE上报网元 2的寻 址信息的指示；
网元 1根据 UE Information Response中携带的网元 2的寻址信息， 发 送 RLF indication信息到网元 2,具体实现包括： 网元 1发送 RLF indication 信息到 CN, CN根据网元 2的寻址信息将 RLF indication信息发送到网元 2; 网元 2根据 RLF indication信息和相关 UE context定时器来判决具体的 切换场景， 例如， 切换过晚、 或切换过早、 或切换到了错误小区； 网络侧 根据切换的具体场景来进行切换参数的优化。 （关于如何进行判决及优化属 于现有技术， 其具体实现不属于本发明的保护范围， 也不用于限定本发明 的保护范围。
第四实施例， 结合图 5所示的切换场景， 4艮设 RRC重建立失败， UE 在 LTE系统中 RRC建立成功， 本实施例中通过在 RRC建立请求消息、 或 RRC建立完成消息、 或 UE Information Response消息中携带网元 1的寻址 信息来传递目标网元的寻址信息。 第四实施例的具体实现描述如下：
假设 UE在网元 2所辖的 Cell 2中处于连接态， 由于无线链路信号很 差、 切换失败或其它原因导致发生了 RLF, UE选择了 celll进行 RRC重建 立， UE向网元 1发送 RRC重建立请求消息， 由于 cell 1中没有 UE的上下 文（ context )或其它原因， UE在 cell 1中的 RRC重建立失败， UE转入 idle 态。 UE在 idle态中通过小区重选， 重选到 cell3 , 并向网元 3发送 RRC建 立请求消息， RRC建立成功进入连接态。 其中， UE在选择 celll进行 RRC 重建立过程中， 可以通过读取 celll的广播信息获得网元 1的寻址信息； 在网元 1收到来自 UE的 RRC重建立请求消息后，发送无线链路失败 指示 RLF indication信息到网元 2, 指示 UE发生了 RLF, 在 RLF indication 信息中包含有从来自 UE的 RRC重建立请求消息中获得的 C-RNTI和 PCI, 以及 UE选择进行 RRC重建立尝试的 celll的全球标识 ECGI, 还可以进一 步携带有短的 MAC完整性验证值（ shortMAC-I );
网元 2收到 RLF indication信息后 , 根据其中携带的 C-RNTI和 PCI匹 配到具体的 UE context; 进一步地， 还可以利用 shortMAC-I进行验证。 网 元 2可以根据与该 UE context的定时器，以及该 UE的上一次的切换过程来 判断具体的切换场景。 例如， 如果该 UE context的定时器已超时， 则可判 断是一次从 cell2到 celll的切换过晚； 如果该 UE context的定时器未超时， 且 UE的上一次的切换过程的源小区是 celll , 则判断这是一次从 celll 到 cell2的切换过早； 如果该 UE context的定时器未超时， 且 UE的上一次的 切换过程的源小区是其它小区， 则判断从该其它小区到 cell2的切换是切换 到了错误小区； （关于如何进行判决属于现有技术， 其具体实现不属于本发 明的保护范围， 也不用于限定本发明的保护范围。）
网元 3接收到来自 UE的 RRC建立完成消息， 其中携带有 UE保存有 RLF相关测量信息的指示。网元 3给 UE发送 UE Information Request消息， 要求 UE上报 RLF相关测量信息， UE通过 UE Information Response消息将 RLF相关测量信息上报至网元 3 ,其中 UE Information Response消息中还可 以进一步携带 UE在 celll 中发送的 RRC重建立请求消息中携带的 PCI, C-RNTI; 还可以进一步携带 Short MAC-I, 还可以进一步携带 UE在 RLF 后第一次进行 RRC重建立尝试的 celll的 ECGI。 其中， 可以在 RRC建立 请求消息、或 RRC建立完成消息、或 UE Information Response消息、或 RRC 重配置完成 ( RRC Connection Reconfiguration Complete )消息中携带网元 1 的寻址信息。
进一步地，网元 3可以在 RRC建立消息（ RRC setup )或 UE Information Request或 RRC重配置消息（ RRC Connection Reconfiguration )或其它下行 消息中携带一个指示，用于指示 UE是否需要上报网元 1的寻址信息，若需 要， 则 UE通过 RRC建立完成消息、 或 UE Information Response消息、 或 RRC重配置完成消息上 网元 1的寻址信息；
网元 3发送 RLF indication信息到 CN, CN根据网元 1的寻址信息将 RLF indication信息发送到网元 1。这里的 RLF indication信息中包含有 RRC 重建立请求消息中携带的 C-RNTI和 PCI,还可以进一步携带 Short MAC-I, 还可以进一步携带 UE选择进行 RRC重建立尝试的 celll的 ECGI, 还可以 进一步携带 UE上报的 RLF相关测量信息， 还可以进一步携带用于标识是 RLF indication第二部分的标识；
网元 1收到来自网元 3的 RLF indication信息，将其作为网元 1 自身发 送给网元 2的 RLF indication信息的第二部分发送给网元 2。 网元 2收到第 二条 RLF indication信息后， 根据其中携带的 RLF相关测量信息来确定是 切换参数问题还是覆盖问题。 例如服务小区和最好的周围小区的信号质量 都比较差， 那么说明这里可能存在覆盖漏洞等。 （关于如何确定属于现有技 术， 其具体实现不属于本发明的保护范围， 也不用于限定本发明的保护范 围。）
第五实施例， 结合图 5所示的切换场景， 4艮设 RRC重建立失败， UE 在 LTE系统中 RRC建立成功， 本实施例中通过在 RRC建立请求消息、 或 RRC建立完成消息、 或 UE Information Response消息或其它上行消息中携 带网元 2 的寻址信息来传递目标网元的寻址信息。 第五实施例的具体实现 描述如下： 假设 UE在网元 2所辖的 Cell 2中处于连接态， 由于无线链路信号很 差、 切换失败或其它原因导致发生了 RLF, UE选择了 celll进行 RRC重建 立， UE向发送 RRC重建立请求消息到网元 1 , 由于 cell 1中没有 UE的上 下文 context, UE在 cell 1中的 RRC重建立失败， UE转入 idle态。 或者， UE选择了 celll但没有发起 RRC重建立请求直接转入 idle态， 例如 celll 是系统间小区。 UE在 idle态中通过小区重选， 重选到 cell3 , 并向网元 3 发送 RRC建立请求消息， UE进行 RRC建立成功进入连接态；
网元 3接收来自 UE的 RRC建立完成消息，其中携带有 UE保存有 RLF 相关测量信息的指示。 网元 3给 UE发送 UE Information Request消息， 要 求 UE上报 RLF相关测量信息， UE通过 UE Information Response消息将 RLF相关测量信息上报至网元 3。 其中， UE Information Response消息中还 可以进一步携带 UE在 celll中发送的 RRC重建立请求消息中携带的 PCI, C-RNTI, Short MAC-I, 其中， PCI是 cell2的 PCI, C-RNTI和 Short MAC-I 是 cell2中与该 UE相关的参数。 还可以进一步携带 UE在 RLF后第一次进 行 RRC重建立尝试选择的小区 celll的全球标识，还可以进一步携带 UE切 换到小区 cell2和尝试在 celll发起 RRC重建立的时间差， 还可以进一步携 带 UE在 cell2之前驻留的小区的全球标识。其中， 可以在 RRC建立请求消 息、 或 RRC建立完成消息、 或 UE Information Response消息、 或 RRC重 配置完成消息或其它上行消息中携带网元 2的寻址信息， 这里， 网元 2的 寻址信息可以是 UE通过读取 cell2的广播信息得到的。
进一步地，网元 3可以在 RRC建立消息（ RRC setup )、或 UE Information Request消息、 或 RRC重配置消息、 或其它下行消息中携带一个指示， 用 于指示 UE是否需要上报网元 2的寻址信息，若需要，则 UE可以通过 RRC 建立完成消息、 或 UE Information Response消息、 或 RRC重配置完成消息 或其它上行消息上报网元 2的寻址信息；
网元 3发送 RLF indication信息到 CN, CN根据网元 2的寻址信息将 RLF indication信息发送到网元 2。 这里的 RLF indication信息中包含有从 RRC重建立请求消息中获得的 C-RNTI和 PCI, 还可以进一步携带 Short MAC-I,还可以进一步携带 UE选择进行 RRC重建立尝试的 celll的全球标 识， 还可以进一步携带 UE上报的 RLF相关测量信息， 还可以进一步携带 UE切换到 cell2和尝试在 celll发起 RRC重建立请求的时间差， 还可以进 一步携带 UE在 cell2之前驻留的小区的全球标识；
网元 2收到 RLF indication信息后 , 根据其中携带的 C-RNTI和 PCI匹 配到具体的 UE context; 进一步地， 还可以利用 shortMAC-I来进行验证。 网元 2可以根据与该 UE context的定时器和 UE切换到小区 cell2和尝试在 celll发起 RRC重建立请求的时间差来判断具体的切换场景。 例如， 如果该 UE context的定时器小于这个时间差，则可判断是一次从 cell2到 celll的切 换过晚；如果该 UE context的定时器大于这个时间差，且 UE的上一次的切 换过程的源小区是 celll , 则判断这是一次从 celll到 cell2的切换过早； 如 果该 UE context的定时器大于这个时间差，且 UE的上一次的切换过程的源 小区是其它小区 cell 4, 则判断从该其它小区 cell 4到 cell2的切换是切换到 了错误小区。并且可以从 RLF indication信息中得到 UE在 cell2之前驻留的 小区的全球标识， 也就是所述的其它小区 cell 4; (关于如何进行判决属于 现有技术， 其具体实现不属于本发明的保护范围， 也不用于限定本发明的 保护范围。）
网元 2还可以根据 RLF indication信息中的 RLF相关测量信息来确定 是切换参数问题还是覆盖问题。 例如服务小区和最好的周围小区的信号质 量都比较差， 那么说明这里可能存在覆盖漏洞等。 （关于如何确定属于现有 技术， 其具体实现不属于本发明的保护范围， 也不用于限定本发明的保护 范围。）
第六实施例，结合图 4所示的切换场景，假设 UE在 UMTS系统中 RRC 重建立成功， 具体实现描述如下： 假设 UE在网元 2所辖的 Cell2中处于连接态，由于无线链路信号很差、 切换失败或其它原因导致发生了 RLF, UE选择了 UMTS系统的 celll进行 RRC重建立， UE向网元 1发送 RRC重建立请求即小区更新 （ cell update ) 消息， 网元 1发送小区更新确认（cell update confirm ) 消息至 UE, UE返 回重配完成消息即无线 7 载重配置完成 （ Radio Bearer Reconfiguration Complete ) 消息或传输信道重配置完成 ( transport channel reconfiguration complete ) 消息或物理信道重配置完成 ( hysical channel reconfiguration complete ) 消息， RRC重建立成功。 其中， UE可以在 cell update消息、 或 无线承载重配完成消息、 传输信道重配置完成消息、 物理信道重配置完成 消息中携带网元 2的寻址信息；
进一步地， 网元 1可以在 cell update confirm消息或其它下行消息中携 带一个指示， 用于指示 UE是否需要上报网元 2的寻址信息， 若需要， 则 UE上报网元 2的寻址信息；
网元 1根据网元 2的寻址信息向网元 2发送 RLF indication信息。具体 实现包括： 网元 1发送 RLF indication信息到 CN, CN根据网元 2的寻址 信息将 RLF indication信息发送到网元 2;
网元 2根据 RLF indication和相关 UE context定时器来判决具体的切换 场景， 例如， 切换过晚、 切换过早、 切换到了错误小区； 网络侧根据切换 的具体场景来进行切换参数的优化。 （关于如何进行判决及优化属于现有技 术， 其具体实现不属于本发明的保护范围， 也不用于限定本发明的保护范 围。）
第七实施例， 结合图 6所示的切换场景， H没 UE进行 RRC重建立失 败后， 在 UMTS系统中进行 RRC建立成功， 本实施例中， UE上报的是网 元 1的寻址信息。 具体实现描述如下：
假设 UE在网元 2所辖的 Cell 2中处于连接态， 由于无线链路信号很 差、 切换失败或其它原因导致发生了 RLF, UE选择了 UMTS系统的 celll 进行 RRC重建立， 由于各种原因重建立失败或未发起重建立尝试。 网元 1 向网元 2发送 RLF indication信息， 在 RLF indication信息中包含有 UE的 context,发生 RLF的小区信息、 RRC重建立尝试的小区信息等内容； 随后， UE转入 idle态， 小区重选到 UMTS系统的 cell3中，发起 RRC建立并建立 成功。 UE可以在 cell update消息、 或 RRC建立请求消息、 或 RRC建立完 消息、 或 UE Information Response消息、 或其它上行消息中携带网元 1的 寻址信息；
进一步地，网元 3可以在 RRC建立消息（ RRC setup )、或 UE Information Request或其它下行消息中携带一个指示， 用于指示 UE是否需要上报网元 1的寻址信息， 若需要， 则 UE上报网元 1的寻址信息；
网元 3根据网元 1的寻址信息， 向网元 1发送 RLF indication信息， 具 体包括： 网元 3发送 RLF indication信息到 CN, CN根据网元 1的寻址信息 将 RLF indication信息发送到网元 1。 网元 1 再将这部分内容作为 RLF indication信息的第二部分发送到网元 2；
网元 2根据 RLF indication和相关 UE context定时器来判决具体的切换 场景， 例如， 切换过晚、 切换过早、 切换到了错误小区。 网络侧根据切换 的具体场景来进行切换参数的优化。 （关于如何进行判决及优化属于现有技 术， 其具体实现不属于本发明的保护范围， 也不用于限定本发明的保护范 围。）
第八实施例， 结合图 6所示的切换场景， H没 UE进行 RRC重建立失 败后， 在 UMTS系统中进行 RRC建立成功， 本实施例中， UE上报的是网 元 2的寻址信息。 具体实现描述如下：
假设 UE在网元 2所辖的 Cell 2中处于连接态， 由于无线链路信号很 差、 切换失败或其它原因导致发生了 RLF, UE选择了 UMTS系统的 celll 进行 RRC重建立， 由于各种原因重建立失败或未发起重建立尝试。 UE转 入 idle态， 小区重选到 cell3中； 随后， 发起 RRC建立并建立成功。 UE可 以在 RRC建立请求消息、或 RRC建立完成消息、或 UE Information Response 消息中携带网元 2的寻址信息；
进一步地，网元 3可以在 RRC建立消息（ RRC setup )、或 UE Information Request或其它下行消息中携带一个指示， 用于指示 UE是否需要上报网元 2的寻址信息， 若需要， 则 UE上报网元 2的寻址信息；
网元 3根据网元 2的寻址信息， 向网元 2发送 RLF indication信息，具 体包括： 网元 3发送 RLF indication信息到 CN, 核心网根据网元 2的寻址 信息将 RLF indication信息发送到网元 2;
网元 2根据 RLF indication和相关 UE context定时器来判决具体的切换 场景， 例如， 切换过晚、 切换过早、 切换到了错误小区。 网络侧根据切换 的具体场景来进行切换参数的优化。 （关于如何进行判决及优化属于现有技 术， 其具体实现不属于本发明的保护范围， 也不用于限定本发明的保护范 围。）
本发明上述实施例中的 RLF相关测量信息为：在 RLF发生之前的服务 小区和最好的周围小区的信号质量测量结果、 UE在随后发起重建时所测量 的服务小区和最好的周围小区的信号质量的测量结果，以及 UE的位置信息 中的一项或多项。
以上所述， 仅为本发明的较佳实施例而已， 并非用于限定本发明的保 护范围， 凡在本发明的精神和原则之内所作的任何修改、 等同替换和改进 等， 均应包含在本发明的保护范围之内。

Claims

权利要求书
1、 一种切换场景判决过程中确定目标网元的方法， 其特征在于， 在小 区重选后， 包括： 用户设备 UE与重选网元建立连接过程中， 携带目标网元 的寻址信息；
重选网元， 根据获取的用户设备携带的目标网元的寻址信息， 向目标 网元发送无线链路失败 RLF指示信息。
2、 根据权利要求 1所述的方法， 其特征在于， 该方法之前还包括： 所述 UE进行无线资源控制 RRC重建立，并在 RRC重建立过程中，携 带目标网元的寻址信息；
被请求 RRC重建立的网元， 根据获取的用户设备携带的目标网元的寻 址信息， 向目标网元发送 RLF指示信息。
3、 根据权利要求 1所述的方法， 其特征在于， 所述目标网元为 UE发 生 RLF的网元； 所述向目标网元发送 RLF指示信息包括：
所述重选网元经由核心网向所述 UE发生 RLF的网元发送 RLF指示信 息。
4、 根据权利要求 2所述的方法， 其特征在于， 如果所述 UE重建立失 败， 在小区重选后， 该方法还包括： 所述 UE与重选网元建立连接过程中， 携带目标网元的寻址信息； 重选网元， 根据建立连接过程中携带的目标网 元的寻址信息， 向目标网元发送 RLF指示信息；
所述目标网元为 UE发生 RLF的网元或被 UE请求 RRC重建立的网元。
5、 根据权利要求 1所述的方法， 其特征在于， 在所述与重选网元建立 连接过程中， 所述目标网元的寻址信息携带在 UE信息响应消息， 或 RRC 建立请求消息， 或 RRC建立完成消息中。
6、 根据权利要求 2所述的方法， 其特征在于， 所述目标网元的寻址信 息携带在 RRC重建立请求消息、或 RRC重建立完成消息、或 UE信息响应 消息中。
7、 根据权利要求 2所述的方法， 其特征在于， 该方法还包括： 所述被请求 RRC重建立的网元在 RRC重建立消息、 或 RRC重配置消 息、或其它下行消息中携带一个指示，用于指示 UE是否需要上报目标网元 的寻址信息；
在所述指示显示需要上报目标网元的寻址信息时， 所述 UE通过 RRC 重建立完成消息、 或 RRC重配置完成消息携带目标网元的寻址信息。
8、 根据权利要求 2所述的方法， 其特征在于， 所述 RRC重建立过程 成功完成时， 该方法还包括：
所述 UE在发送给所述被请求 RRC重建立的网元的 RRC建立完成消息 中携带有 UE保存有 RLF相关测量信息的指示；
所述被请求 RRC重建立的网元给 UE发送 UE信息请求消息， 要求所 述 UE上艮 RLF相关测量信息；
所述 UE通过 UE信息响应消息将 RLF相关测量信息及目标网元的寻 址信息上报至所述被请求 RRC重建立的网元。
9、 根据权利要求 8所述的方法， 其特征在于， 所述被请求 RRC重建 立的网元还进一步在 UE信息请求消息中携带一个指示，用于指示 UE上报 目标网元的寻址信息。
10、 根据权利要求 4所述的方法， 其特征在于， 在所述与重选网元建 立连接过程中， 所述目标网元的寻址信息携带在 RRC 建立请求消息、 或 RRC建立完成消息、 或 UE信息响应消息、 或 RRC重配置完成消息或其它 上行消息中。
11、 根据权利要求 10所述的方法， 其特征在于， 该方法还包括： 所述 重选网元在 RRC建立消息、 或 UE信息请求消息、 或 RRC重配置消息、 或 其它下行消息中携带一个指示，用于指示 UE是否需要上报目标网元的寻址 信息。
12、 根据权利要求 11所述的方法， 其特征在于， 所述目标网元为被请 求 RRC重建立的网元； 所述向目标网元发送 RLF指示信息包括：
所述重选网元经由核心网向所述被请求 RRC 重建立的网元发送 RLF 指示信息；所述被请求 RRC重建立的网元将接收到的 RLF指示信息作为自 身发送给目标网元的 RLF指示信息的第二部分发送给目标网元。
13、 根据权利要求 1或 2所述的方法， 其特征在于， 所述目标网元、 或被请求 RRC重建立的网元、 或重选网元为： 基站 /家庭基站、 或无线网络 控制器 RNC、 或基站控制器 BSC。
14、 根据权利要求 1~12任一项所述的方法， 其特征在于， 所述目标网 元的寻址信息为发送 RLF指示信息到目标网元所需要的寻址信息，具体为： 当所述目标网元为长期演进 LTE基站时， 所述寻址信息包含全局基站 标识和跟踪区域标识 TAI信息， 或者， 能包含所述全局基站标识和 TAI内 容的信息；
当所述目标网元为通用移动通信系统 UMTS中的 RNC时，所述寻址信 息包含位置区标识 LAI、 路由区域码 RAC、 基站控制器标识、 扩展基站控 制器标识中的一项或多项；
当所述目标网元为全球移动通信 GSM系统中的基站控制器时，所述寻 址信息为小区全球标识 CGI。
15、一种切换过程中确定目标网元的系统，其特征在于，至少包括 UE、 目标网元和重选网元， 其中，
所述 UE, 用于在与重选网元建立连接过程中， 将目标网元的寻址信息 传递给重选网元；
重选网元， 用于在与 UE建立连接过程中， 获取目标网元的寻址信息， 在 RRC建立成功后， 向目标网元发送 RLF指示信息；
目标网元， 用于接收 RLF指示信息。
16、 根据权利要求 15所述的系统， 其特征在于， 所述系统还包括被请 求 RRC重建立的网元， 其中，
UE,还用于与被请求 RRC重建立的网元进行 RRC重建立过程，在 RRC 重建立过程中携带目标网元的寻址信息；
被请求 RRC重建立的网元，用于与 UE进行 RRC重建立过程，在 RRC 重建立过程获取目标网元的寻址信息， RRC重建立成功后， 向目标网元发 送 RLF indication信息；
目标网元，还用于接收来自被请求 RRC重建立的网元的 RLF indication 信息， 并完成切换场景的判决。
17、 根据权利要求 16所述的系统， 其特征在于， 在所述 UE重建立失 败时，
所述 UE, 还用于在与所述重选网元建立连接过程中， 将目标网元的寻 址信息传递给重选网元；
重选网元， 还用于在 RRC建立成功后， 向所述被请求 RRC重建立的 网元发送 RLF指示信息， 所述被请求 RRC重建立的网元再将该 RLF指示 信息作为发送给目标网元的 RLF指示信息的第二部分发送给目标网元。
18、 根据权利要求 15~17任一项所述的系统， 其特征在于， 在 LTE系 统中， 所述目标网元、 或请求 RRC重建立的网元、 或重选网元为基站 /家庭 基站；
在 UMTS系统中， 所述目标网元、 或请求 RRC重建立的网元、 或重选 网元为 RNC;
在 GSM系统中， 所述目标网元、 或请求 RRC重建立的网元、 或重选 网元为 BSC。
PCT/CN2011/076505 2010-07-28 2011-06-28 切换场景判决过程中确定目标网元的方法及系统 WO2012013107A1 (zh)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN201010242061.0A CN102348217B (zh) 2010-07-28 2010-07-28 切换过程中确定目标网元的方法及系统
CN201010242061.0 2010-07-28

Publications (1)

Publication Number Publication Date
WO2012013107A1 true WO2012013107A1 (zh) 2012-02-02

Family

ID=45529408

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CN2011/076505 WO2012013107A1 (zh) 2010-07-28 2011-06-28 切换场景判决过程中确定目标网元的方法及系统

Country Status (2)

Country Link
CN (1) CN102348217B (zh)
WO (1) WO2012013107A1 (zh)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103581961B (zh) * 2012-07-27 2017-09-01 电信科学技术研究院 无线链路失败的上报及处理方法和设备
CN103686884A (zh) * 2012-09-25 2014-03-26 中国移动通信集团公司 一种发送rlf信息的方法、系统及基站、网管
CN103841608A (zh) * 2012-11-21 2014-06-04 中兴通讯股份有限公司 无线资源控制连接重建立的方法、装置及系统
CN114449603A (zh) * 2012-12-24 2022-05-06 北京三星通信技术研究有限公司 无线通信系统中的基站及由其执行的方法
CN110049577B (zh) * 2018-01-15 2021-02-02 大唐移动通信设备有限公司 一种无线资源控制rrc重建立的方法及装置
CN110149630A (zh) * 2018-02-11 2019-08-20 华为技术有限公司 一种安全算法的协商、发送方法及装置
CN112243273A (zh) * 2019-07-16 2021-01-19 夏普株式会社 信息上报方法及对应的用户设备

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1980463A (zh) * 2005-11-29 2007-06-13 华为技术有限公司 一种移动终端上下文的管理方法
CN101374321A (zh) * 2007-08-22 2009-02-25 华为技术有限公司 一种演进网络切换处理方法与系统
CN101400088A (zh) * 2007-09-30 2009-04-01 华为技术有限公司 一种演进网络中的切换方法及设备
WO2009084998A1 (en) * 2008-01-03 2009-07-09 Telefonaktiebolaget Lm Ericsson (Publ) Fast radio link recovery after handover failure
CN101647299A (zh) * 2007-03-21 2010-02-10 诺基亚公司 用于切换失败恢复的方法、设备和计算机程序产品

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1980463A (zh) * 2005-11-29 2007-06-13 华为技术有限公司 一种移动终端上下文的管理方法
CN101647299A (zh) * 2007-03-21 2010-02-10 诺基亚公司 用于切换失败恢复的方法、设备和计算机程序产品
CN101374321A (zh) * 2007-08-22 2009-02-25 华为技术有限公司 一种演进网络切换处理方法与系统
CN101400088A (zh) * 2007-09-30 2009-04-01 华为技术有限公司 一种演进网络中的切换方法及设备
WO2009084998A1 (en) * 2008-01-03 2009-07-09 Telefonaktiebolaget Lm Ericsson (Publ) Fast radio link recovery after handover failure

Also Published As

Publication number Publication date
CN102348217A (zh) 2012-02-08
CN102348217B (zh) 2016-08-03

Similar Documents

Publication Publication Date Title
KR101432913B1 (ko) 핸드오버 시나리오 판단 파라미터를 리포팅하는 방법과 ｕｅ, 및 핸드오버 시나리오 판단 기지국
US10154535B2 (en) Method and apparatus for transmitting a handover report and an RLF report
US8792891B2 (en) Method and system for identifying a terminal
EP2348771B1 (en) Method and device for informing handover failure indication information
EP2982165B1 (en) Methods of operating radio access network base stations and related network nodes
JP5698843B2 (ja) 情報を提供するための方法、移動局装置、基地局装置及び通信装置
JP5916262B2 (ja) セルラー無線通信システムにおけるハンドオーバー方法
EP2720487B1 (en) Cell information reporting
US20160037408A1 (en) Method for processing radio link failure report and method for adjusting mobile parameter
US20100113024A1 (en) Method of handling an inter rat handover in wireless communication system and related communication device
JP5787240B2 (ja) ハンドオーバ失敗の処理方法及びユーザ装置
CN101998466B (zh) 一种不期望的切换场景的判决方法和系统
WO2010121553A1 (zh) 小区间的重选参数和切换参数匹配的判断方法及装置
US9510253B2 (en) Method and system for determining reason for too late handover to home eNB
WO2012013107A1 (zh) 切换场景判决过程中确定目标网元的方法及系统
CN105072644B (zh) 用于在蜂窝式无线通信系统中提供信息的方法
KR20130130351A (ko) 이종망 간의 핸드오버 수행 방법 및 이를 위한 단말 장치
WO2012034271A1 (zh) 获取无线网络控制器标识的方法及系统

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 11811808

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 11811808

Country of ref document: EP

Kind code of ref document: A1