WO2012048627A1 - 无线链路失败指示的处理方法和装置 - Google Patents

无线链路失败指示的处理方法和装置 Download PDF

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Publication number
WO2012048627A1
WO2012048627A1 PCT/CN2011/080600 CN2011080600W WO2012048627A1 WO 2012048627 A1 WO2012048627 A1 WO 2012048627A1 CN 2011080600 W CN2011080600 W CN 2011080600W WO 2012048627 A1 WO2012048627 A1 WO 2012048627A1
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WIPO (PCT)
Prior art keywords
indication
radio link
time
link failure
rlf
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PCT/CN2011/080600
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English (en)
French (fr)
Inventor
奥鲁佛松⋅亨里克
王君
季莉
张欢
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华为技术有限公司
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Publication of WO2012048627A1 publication Critical patent/WO2012048627A1/zh

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W24/00—Supervisory, monitoring or testing arrangements
    • H04W24/08—Testing, supervising or monitoring using real traffic
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/10—Connection setup
    • H04W76/19—Connection re-establishment

Definitions

  • the present invention relates to the field of communications, and in particular, to a method and apparatus for processing a radio link failure indication. Background technique
  • 3GPP R9 The 3rd Generation Partnership Project R9, Version 3 of the 3rd Generation Partnership Project
  • 3GPP R9 defines several mobility optimization scenarios due to improper handover parameter settings, ie switching too late scenes, switching premature scenes and switching to In the error cell scenario, by periodically identifying and collecting the abnormal handover scenarios, the handover parameters are adjusted to reduce or avoid these abnormal handover scenarios when the optimization adjustment period arrives.
  • the reestablishment target base station sends an RLF indication (Radio Link Failure indication) to the source base station regardless of whether the reconstruction of the UE is successful.
  • the indication may or may not include the RLF Report (Radio Link Failure Report).
  • the UE does not successfully select the cell after the RLF or the reestablishment fails to enter the idle state, and then successfully establishes a new RRC connection. If the RLF Report is saved in the UE, the RRC establishes the target.
  • the base station sends the RLF Indication to the previously generated RLF cell according to the content of the RLF Report.
  • the source base station sends the RLF Indication or the coverage vulnerability according to the received RLF Indication. Therefore, if the UE sends the RLF during the RRC reestablishment and the subsequent RRC establishment, the RLF is sent. Indication, it is possible to repeat statistics, or not to send when RRC re-establishment and wait for subsequent RRC establishment, and there may be statistical omissions.
  • the embodiments of the present invention provide a method and a device for processing a radio link failure indication, so as to reduce excessive information storage and resource waste on the base station side, while satisfying the reason for correctly distinguishing the failure of the wireless link.
  • the embodiment of the present invention provides a method for processing a radio link failure indication, where the method includes: receiving a radio link failure indication; determining, according to the identifier carried in the radio link failure indication, the radio link failure The transmission timing of the indication; if the radio link failure indication is sent after the UE performs RRC reestablishment, and the radio link fails The indication does not include a radio link failure report, and the radio link failure reason is determined as a handover parameter problem, and the number of statistics of the abnormal handover type determined according to the radio link failure indication is incremented by one.
  • an embodiment of the present invention provides a processing apparatus for a radio link failure indication, where the apparatus includes: a first receiving unit, configured to receive a radio link failure indication; and a first determining unit, configured to The identifier carried in the link failure indication determines a transmission timing of the radio link failure indication; the first processing unit is configured to send, after the radio link failure indication is performed by the UE, the radio chain
  • the radio link failure reason is determined as the handover parameter problem, and the number of statistics of the abnormal handover type determined according to the radio link failure indication is incremented by one.
  • the embodiment of the present invention provides a method for processing a radio link failure indication, where the method includes: receiving a handover report sent by a base station that generates an RLF after receiving a radio link failure indication; The number of statistics of the abnormal switch type indicated in the switch report is incremented by one.
  • an embodiment of the present invention provides a processing apparatus for a radio link failure indication, where the apparatus includes: a first receiving unit, configured to receive a handover report sent by a base station that generates an RLF after receiving a radio link failure indication.
  • the first processing unit is configured to add, according to the handover report received by the first receiving unit, the number of statistics of the abnormal handover type indicated in the handover report by one.
  • the method and the device provided by the embodiments of the present invention can reduce excessive information storage and resource waste on the base station side on the premise that the problem of correctly distinguishing the statistical switching parameters and the problem of covering the vulnerability can be satisfied.
  • FIG. 1 is a flow chart of a method according to an embodiment of the present invention.
  • FIG. 2 is a flow chart of a method according to another embodiment of the present invention.
  • FIG. 3 is a flowchart of a method according to still another embodiment of the present invention.
  • FIG. 4 is a flowchart of a processing method for receiving a second radio link failure indication time in a current statistical adjustment period when the handover is too late in the embodiment of the present invention
  • FIG. 5 is a flowchart of a processing method in which the time when the second radio link failure indication is received when the handover is too late is not within the current statistical adjustment period according to the embodiment of the present invention
  • FIG. 6 is a flowchart of a processing method in which the time when the down-counting indication is received when the handover is too late is within the current statistical adjustment period according to the embodiment of the present invention
  • FIG. 7 is a diagram showing that the time when the down-counting indication is received when the handover is too late is not outside the current statistical adjustment period according to the embodiment of the present invention. Processing method flow chart;
  • FIG. 8 is a flowchart of a processing method for a time when a UE does not select a suitable cell and receives a radio link indication time within a current statistical adjustment period when the handover is too late in the embodiment of the present invention
  • FIG. 9 is a flowchart of a processing method in which the UE does not select a suitable cell and the time when the radio link indication is received is not within the current statistical adjustment period when the handover is too late in the embodiment of the present invention
  • FIG. 10 is a flowchart of a processing method for receiving a down-counting indication when the handover is too early in the current statistical adjustment period according to an embodiment of the present invention
  • FIG. 11 is a flowchart of a processing method for receiving a down-counting indication when the handover is too early, which is not within the current statistical adjustment period, according to an embodiment of the present disclosure
  • FIG. 12 is a flowchart of a processing method for receiving a radio link failure indication time in the current statistical adjustment period when the handover is too early in the embodiment of the present invention
  • FIG. 13 is a flowchart of a processing method in which the time when the wireless link failure indication is received when the handover is too early is not within the current statistical adjustment period according to the embodiment of the present invention
  • FIG. 14 is a flowchart of a processing method for receiving a second wireless link failure indication time within a current statistical adjustment period in a case where a handover failure occurs in a handover process in a handover process in the embodiment of the present invention
  • 15 is a flowchart of a processing method in which a time when a second radio link failure indication is received is not within the current statistical adjustment period in the case that the handover failure occurs in the handover process in the handover process in the embodiment of the present invention
  • 16 is a flowchart of a processing method for receiving a countdown indication sent by a base station that generates an RLF in a current statistical adjustment period when switching to an error cell according to an embodiment of the present invention
  • FIG. 17 is a flowchart of a processing method for receiving a countdown indication sent by a base station that generates an RLF when the handover to the wrong cell is not within the current statistical adjustment period according to the embodiment of the present invention
  • FIG. 18 is a flowchart of a processing method for receiving a wireless link failure indication time within a current statistical adjustment period in a case where a handover failure occurs in a handover process to a wrong cell in the handover process according to the embodiment of the present invention
  • FIG. 19 is a flowchart of a processing method in which the time when the wireless link failure indication is received is not within the current statistical adjustment period in the case where the handover fails to be switched to the wrong cell in the handover process according to the embodiment of the present invention
  • 20 is a block diagram showing the composition of an apparatus according to an embodiment of the present invention.
  • Figure 21 is a block diagram showing the composition of a device according to another embodiment of the present invention. detailed description
  • FIG. 1 is a flowchart of a method for processing a radio link failure indication (RLF indication) according to an embodiment of the present invention.
  • the method may be applied to a base station that receives an RLF indication, such as a base station that generates an RLF, or an RRC reestablishment target base station.
  • an RLF indication such as a base station that generates an RLF, or an RRC reestablishment target base station.
  • the method includes:
  • Step 101 Receive an RLF indication
  • the RRC reestablishment target base station sends an RLF indication that does not carry the RLF report to the RLF generating base station, and then After the UE selects a new cell to perform a new RRC connection setup and succeeds, the UE carries the RLF report in the new RRC connection setup process, and the new RRC connection establishes a successful base station, which is referred to as an RRC setup target in this embodiment.
  • the base station sends an RLF indication carrying the RLF report to the base station or the RRC reestablishment target base station where the RLF occurs.
  • the RRC establishment target base station may be the same base station as the RRC reestablishment target base station or the base station in which the RLF is generated, and may be different according to different types of abnormal handover. The following description will be respectively made by different embodiments.
  • Step 102 Determine, according to the first identifier carried in the RLF indication, a sending occasion of the RLF indication.
  • the sending occasion of the RLF indication may be sent after the UE performs RRC re-establishment, or may be sent after the UE performs a new RRC setup.
  • this embodiment may have different processing. method.
  • the RLF indication is distinguished by carrying the identifier in the RLF indication, whether the RLF indication is sent after the UE performs RRC re-establishment, or after the UE performs a new RRC setup. Therefore, the transmission timing of the RLF indication can be determined based on the identification.
  • Step 103 If the RLF indication is sent after the UE performs RRC re-establishment, and the RLF indication does not include a radio link failure report (RLF report), determining that the radio link failure cause is a handover parameter problem, The number of statistics of the abnormal switching type determined by the RLF indication is increased by one.
  • RLF report radio link failure report
  • the embodiment when the RLF indication is sent after the UE performs the RRC re-establishment, the RLF indication does not include the RLF report. Therefore, the embodiment cannot determine the cause of the radio link failure according to the RLF report, so the default is the handover parameter. Problem, and increments the number of statistics for the type of abnormal switch determined by the RLF indication.
  • the type of the abnormal handover can be determined according to the RLF indication, which can be implemented by the prior art, and details are not described herein again.
  • the problem that causes the radio link to fail may not occur.
  • the problem base station of the RLF therefore, the number of statistics of the abnormal handover type determined according to the RLF indication is increased by one, or By transmitting a handover report to the problem base station causing the radio link failure, the problem base station is instructed to increase the number of statistics of the abnormal handover type determined according to the RLF indication by one.
  • the problem that causes the radio link to fail is the base station that has an abnormal handover due to a problem in the handover parameter setting.
  • the embodiment of the present invention may use different methods to adjust the corresponding statistics times at the source base station or notify the RRC reconstruction target base station to adjust the corresponding statistics times.
  • the abnormal handover type is that the handover is too late, and the problem that causes the radio link to fail is that the base station is the base station where the RLF occurs, so the base station that generates the RLF increases the number of handover statistics by one.
  • the abnormal handover type is that the handover is too early, and the problem that the radio link fails is the RRC reestablishment target base station, and the RLF base station sends a handover report to the RRC reestablishment target base station, indicating the RRC reestablishment target base station. Add 1 to the number of late statistics.
  • the abnormal handover type is to switch to the wrong cell, and the radio link fails.
  • the base station is the base station before the RLF occurs, and the base station that generates the RLF sends a handover report to the base station before the RLF occurs.
  • the base station before the RLF is instructed to trigger the UE to switch to the wrong cell statistics count plus one.
  • the processing of the number of statistics may be determined according to whether the time when the down-counting indication is received is within the current statistical adjustment period.
  • the number of statistics may be decremented by one; when the time when the down-counting indication is received is not within the current statistical adjustment period, then The number of statistics of the determined abnormal switch type is not processed, and the number of statistics of the abnormal switch type to be determined remains unchanged.
  • the length of time recorded by the UE timer is less than the locally calculated time length, it is determined that the time for receiving the down-counting indication is within the current statistical adjustment period; if the time length recorded by the UE timer is greater than The time length of the local calculation is confirmed to be that the time when the down count indication is received is not within the current adjustment period.
  • the start time of the time length recorded by the UE timer is: when the UE generates the RLF or when the UE initiates the RRC reestablishment request or when the UE enters the idle state or the UE reestablishes the rejection; the length of time recorded by the UE timer
  • the end time is: when the UE receives the RRC setup success response message or when the UE sends the RLF report after the RRC setup succeeds.
  • the method provided by the embodiment of the present invention determines the transmission timing of the RLF indication by using the identifier carried in the RLF indication, and further determines the cause of the failure of the radio link and adjusts the number of statistics corresponding to the type of the abnormal handover, which can correctly distinguish the wireless link. If the cause of the failure is a statistical handover parameter problem or a coverage vulnerability problem, the excessive information storage and resource waste on the base station side are reduced.
  • 2 is a flowchart of a method for processing a radio link failure indication (RLF indication) according to an embodiment of the present invention. The method is also applied to a base station that receives an RLF indication. Referring to FIG. 2, the method includes:
  • Steps 201 to 202 may refer to step 101 to step 102 in the embodiment shown in FIG. 1, and details are not described herein again.
  • Step 203 If the RLF indication is sent after the UE performs a new RRC setup, and the RLF indication includes an RLF report, determining, according to the second identifier carried in the RLF indication, whether the UE is re-established or not;
  • the RLF indication is sent after the UE performs a new RRC setup, and the UE may be re-established and rejected after the RLF occurs, that is, after the RLF occurs, the UE selects a cell to perform RRC connection re-establishment but is The cell rejects, and then initiates the new RRC establishment; the UE may also not select an appropriate cell for RRC connection reestablishment after the RLF occurs, causing the idle state to be entered, and then initiating the new RRC establishment. If the UE has been rejected by the re-establishment, it indicates that there is already an RLF indication that does not include the RLF report in step 103.
  • the UE If the UE is not rejected by the re-establishment, it indicates that there is no RLF indication of the step 103 that does not include the RLF report. Since the default radio link failure cause is a handover parameter problem in the processing of step 103, different processing is separately performed for the two cases. Therefore, in this embodiment, the second identifier carried in the RLF indication or the RLF report may be further used to distinguish whether the UE has been rejected by the re-establishment for subsequent processing.
  • the second identifier indicating whether the UE has been re-established or rejected may be the same identifier or a different identifier as the first identifier indicating the RLF indication transmission timing in step 202.
  • the same identifier for example, by a binary numerical representation
  • this embodiment is not limited thereto.
  • Step 204 Determine a radio link failure reason according to the RLF report, and perform corresponding processing according to whether the determined UE has been re-established or not;
  • the UE if it is determined that the UE is rejected by the re-establishment, it indicates that there is already an RLF indication that does not include the RLF report as shown in step 103 in FIG. 1 , and the radio link fails cannot be determined because the RLF report is not received before.
  • the reason is to default to the parameter parameter problem. Therefore, after receiving the RLF report, the true failure reason is determined according to the RLF report.
  • the number of statistics of the abnormal handover type is increased by one according to the default handover parameter problem. Therefore, if the radio link failure reason is determined as the default handover parameter problem according to the RLF report, the previous default is explained. If it is determined that the radio link failure reason is not the default handover parameter problem according to the RLF report, the previous default is incorrect, and the abnormal switch determined according to the RLF indication is switched. The number of statistics for the type is decremented by 1, which also subtracts the wrong statistics.
  • the base station may not be the base station where the RLF occurs, so it will be based on
  • the number of statistics of the abnormal handover type determined by the RLF indication is decreased by one, and may also indicate that the problem base station determines the abnormal handover type according to the RLF indication by sending a down count indication to the problem base station that causes the radio link failure.
  • the number of statistics is reduced by 1.
  • the UE may not select a suitable cell after the RLF.
  • the reestablishment causes a new RRC connection establishment initiated after the idle state.
  • the failure reason can be directly determined according to the RLF report, and corresponding processing is performed according to the failure reason.
  • the reason for the failure of the radio link is a handover parameter problem, the number of statistics of the abnormal handover type corresponding to the RLF indication is incremented by one; if the radio link failure reason is not a handover parameter problem, no processing is performed.
  • the UE initiates a new RRC setup may be a short time after the first re-reject rejection, it may also take a long time, and the handover optimization algorithm performs the handover parameter adjustment according to the statistics number.
  • the time of receiving the RLF indication sent by the UE after the new RRC establishment may have passed the optimization adjustment point, which is not within the current statistical adjustment period. In this case, due to the previous statistics.
  • the adjustment cycle has been parameterized and no processing is required.
  • the UE after receiving the RLF indication sent by the UE after the new RRC establishment, it is determined whether the time of receiving the RLF indication is within the current statistical adjustment period; The time of the RLF indication is within the current statistical adjustment period, and the UE determines whether the UE is re-established and rejected according to the identifier in the RLF indication, and performs step 204; if the RLF indication is received, the time is not in the current statistics. Within the adjustment period, no processing is done.
  • the method can determine that the length of time recorded by the UE timer in the RLF report is compared with a locally calculated time length from receiving the RLF indication to the latest previous statistical adjustment time. Whether the time of the RLF indication is within the current statistical adjustment period.
  • time length of the UE timer is less than the locally calculated time length, it is determined that the time when the RLF indication is received is within the current statistical adjustment period; if the time length of the UE timer record is greater than The time length of the local calculation is confirmed to be that the time when the RLF indication is received is not within the current statistical adjustment period.
  • the start time of the time length recorded by the UE timer is: when the UE generates the RLF or when the UE initiates the RRC reestablishment request or when the UE enters the idle state or the UE reestablishes the rejection; the length of time recorded by the UE timer
  • the end time is: when the UE receives the RRC setup success response message or when the UE sends the RLF report after the RRC setup succeeds.
  • the method provided by the embodiment of the present invention determines the transmission timing of the RLF indication by using the identifier carried in the RLF indication, and further determines the cause of the failure of the radio link and the number of statistics corresponding to the abnormal handover type, which can correctly distinguish the wireless chain.
  • the reason for the failure of the road is to count the problem of switching parameters or to cover the problem of the vulnerability. Excessive information storage and resource waste on the station side.
  • FIG. 3 is a flowchart of a method for processing a radio link failure indication (RLF indication) according to an embodiment of the present invention.
  • RLF indication radio link failure indication
  • the handover is too early or switches to an error.
  • the abnormal handover type of the cell is applied to the problem base station in the abnormal handover type. Referring to FIG. 3, the method includes:
  • Step 301 Receive a handover report sent by the base station that generates the RLF after receiving the RLF indication.
  • the base station that generates the RLF determines that the RLF indication is sent after the RRC reconfiguration is performed by the UE, and the RLF indication does not include the RLF report. If the abnormal handover type is that the handover is too early or the handover to the wrong cell, that is, the base station where the RLF occurs is not the problematic base station that causes the radio link to fail, the base station that generates the RLF sends a handover to the problematic base station that causes the radio link to fail. Reporting, indicating that the problem base station will increase the number of premature statistics of the handover or the number of times of switching to the wrong cell count plus one.
  • Step 302 Add 1 to the statistics of the abnormal handover type indicated in the handover report according to the handover report.
  • the problem base station of the embodiment receives the handover report, according to the indication in the handover report, the corresponding handover premature statistics number or the handover to the error cell statistics number is incremented by one.
  • the abnormal handover type is that the handover is too early or the handover to the wrong cell is performed. That is, the base station in which the RLF occurs is not a problem base station that causes the radio link to fail.
  • the RLF-enabled base station sends a down-counting indication to the problem base station that causes the radio link to fail. , indicating that the problem base station will reduce the number of premature statistics of the corresponding handover or the number of statistics of the handover too late.
  • step 302 after the number of statistics of the abnormal handover type indicated in the handover report is incremented by one according to step 302, if the down-counting indication sent by the base station that generates the RLF is received, the time when the down-counting indication is received is During the current statistical adjustment period, the corresponding number of statistics is decremented by 1. When the time for receiving the down-counting indication is within the current statistical adjustment period, the statistics of the abnormal switching type are not processed, and The number of statistics for the determined anomaly switch type remains the same.
  • the method of down counting indicates the comparison of the length of time between the most recent previous statistical adjustment time. If the length of time recorded by the UE timer is less than the locally calculated time length, it is confirmed that the time when the down count indication is received is within the current statistical adjustment period; if the time length of the UE timer is recorded If the time length is greater than the locally calculated time, it is confirmed that the time when the down count indication is received is not within the current statistical adjustment period.
  • the start time of the time length recorded by the UE timer is: when the UE generates the RLF or when the UE initiates the RRC reestablishment request or when the UE enters the idle state or the UE reestablishes the rejection; the length of time recorded by the UE timer At the end of The interval is: when the UE receives the RRC setup success response message or the UE sends the RLF report after the RRC establishment is successful.
  • the method provided by the embodiment of the present invention by adjusting the statistics times corresponding to the abnormal handover type according to the handover report and the down-counting indication, it is possible to satisfy the premise that the reason for the failure of the wireless link can be correctly determined as the statistical handover parameter problem or the coverage vulnerability problem Next, reduce excessive information storage and resource waste on the base station side.
  • FIG. 4-7 is a flowchart of information exchange between the UE and the base station eNB0, the RRC reestablishment target base station eNB1, and the RRC setup target base station eNB2 when the RLF abnormal handover type is late.
  • the UE fails to generate a radio link in the cell under the eNBO, selects a cell under the eNB1 for reconstruction, and after the reestablishment is denied to enter the idle state, the RRC connection is successfully established in the eNB2, and the RLF report is sent to
  • the eNB2 may send an RLF indication to the base station eNB0 that generates the RLF, that is, the problem base station whose parameter setting may be incorrect, according to the identifier carried in the RLF indication or the RLF report (FIG. 4, FIG. 5).
  • the RLF indication may also be sent to the base station eNB1 that initiated the reestablishment by the UE (Fig. 6, Fig. 7).
  • FIG. 4 is a flow chart in which eNB2 sends a second RLF indication to eNBO, and eNBO receives the indication within its current statistical adjustment period.
  • FIG. 5 shows that eNB2 sends a second RLF indication to eNB0, and eNBO receives The time to the indication is not within the flow chart of its current statistical adjustment period.
  • 6 is a flow chart in which eNB2 sends a second RLF indication to eNB1, and eNB0 receives the down-counting indication sent by eNB1 within its current statistical adjustment period;
  • FIG. 7 shows that eNB2 sends a second RLF indication to eNB1. The flow chart that the eNBO receives the down count indication sent by the eNB1 is not within its current statistical adjustment period.
  • Step 401 The UE fails to generate a radio link in a cell in the eNB0.
  • Step 402 The UE selects a cell under the eNB1 to perform a reconstruction request.
  • Step 403 The eNB1 rejects the reestablishment request of the UE.
  • Step 404 The eNB1 sends, to the eNB0, the first RLF indication that does not include the RLF report.
  • the RLF indication carries an identifier, where the RLF indication is sent by the UE after the RRC re-establishment, or is sent by the UE after the new RRC is established, and the RLF indication further carries an identifier, indicating whether the UE has been re-established. Refused.
  • the above two identifiers may be implemented by using the same identifier, or may be implemented by using different identifiers. This embodiment is not limited thereto.
  • the RLF indication is sent after the UE performs RRC reestablishment.
  • Step 405 The eNBO default radio link failure cause is a handover parameter problem, and is in accordance with the first RLF indication.
  • the eNB0 increases the number of times of late handover statistics to the corresponding cell according to the identifier in the first RLF indication.
  • the RLF indication is sent after the UE performs the RRC re-establishment, and the RLF indication does not include the RLF report. Therefore, the radio link failure reason is determined as the default handover parameter problem, and the number of handover late statistics is increased by one.
  • Step 406 The UE initiates the reestablishment and is rejected, and then enters an idle state, and then initiates a new RRC setup request in a cell under the eNB2.
  • the RLF report or the RLF report indication is included in the RRC connection request.
  • Step 407 After acquiring the RLF report of the UE according to the foregoing RRC connection request, the eNB2 sends the second RLF indication to the eNB0 that generates the RLF according to the information in the RLF report through the X2 or S1 interface.
  • the second RLF indication also carries an identifier, indicating whether the second RLF indication is sent after the UE performs RRC re-establishment, or is sent after the UE initiates a new RRC establishment; and indicates whether the UE has been Reconstruction refused.
  • Step 408 The eNB0 performs corresponding processing according to the received second RLF indication.
  • the number of statistics of the late switching may be reduced by 1 or the number of statistics of the late switching is not processed, and the number of statistics of the abnormal switching type to be determined remains unchanged.
  • the eNBO After receiving the second RLF indication, the eNBO determines, according to the identifier carried in the second RLF indication, whether the second RLF indication is sent by the UE after RRC re-establishment, or is the UE initiated a new RRC establishment.
  • the sent in this embodiment, is determined to be sent after the UE initiates a new RRC setup.
  • the handover optimization algorithm performs a handover parameter adjustment according to the number of statistics, that is, a certain period, that is, The eNBO may fall within this statistical adjustment period when it receives the second RLF indication, or it may fall within the next statistical adjustment period.
  • a timer may be added on the UE side, and the timer is started when the RRC reestablishment of the UE is rejected, or is started when the UE generates the RLF, or is started when the UE initiates the RRC reestablishment request.
  • the timer is started when the UE enters the idle state; when the UE receives the newly initiated RRC setup success response message, the timer is stopped, or the timer is stopped when the RLF report is sent after the new RRC establishment of the UE is successful.
  • the time recorded by the timer is included in the RLF report and sent to the eNB2, and the eNB2 sends a second RLF indication including the RLF report to the eNB2, and the eNBO receives the timer record length of the indication message as T1, and the eNBO receives the time.
  • the length between the second RLF indication time and the most recent previous parameter adjustment time is T2. If ⁇ 1 ⁇ 2, it is determined that the eNBO falls within the current adjustment period when receiving the second RLF indication; if T1> T2, then determine eNBO When the second RLF indication is received, it falls outside the statistical adjustment period, for example, within the next statistical adjustment period.
  • the time when the eNB0 receives the second RLF indication is within the current statistical adjustment period.
  • the eNBO further determines whether the UE has been re-established and rejected according to the identifier carried in the second RLF indication. In this embodiment, it is determined that the UE has been rejected by the re-establishment, that is, the first RLF indication has been previously performed, and the eNBO
  • the RLF report determines whether the previous RLF is due to a handover parameter problem or an coverage vulnerability problem. If it is true that the previous default statistics are correct for the handover parameter problem, there is no need to modify the late statistics. The number of times; if the problem is covered by the vulnerability, the previous default statistics are wrong, and the number of statistics is too small.
  • the process includes:
  • Steps 501-507 may refer to steps 401-407 in the embodiment shown in FIG. 4, and details are not described herein again.
  • Step 508 The eNB0 performs corresponding processing according to the received second RLF indication.
  • no processing may be performed on the number of times of switching too late, and the number of statistics of the abnormal switching type to be determined remains unchanged.
  • the eNB0 determines, according to the identifier that is carried in the second RLF indication, that the second RLF indication is sent after the UE performs RRC re-establishment, and the time that the eNB0 receives the second RLF indication Not within this statistical adjustment period. Since the eNBO has exceeded the optimization adjustment point when receiving the second RLF indication, it falls within the next statistical adjustment period, and the indication message is associated with the first RLF indication in the previous week. Since the parameter adjustment has been made in the previous cycle, there should be no response to this indication for the next statistical cycle, that is, no modification is made to the number of times the new statistical cycle is switched too late.
  • the process includes:
  • Steps 601-606 can refer to steps 401-406 in the embodiment shown in FIG. 4, and details are not described herein again.
  • Step 607 After acquiring the RLF report of the UE according to the RRC connection request, the eNB1 that performs the RRC reestablishment request according to the information in the RLF report sends the second RLF indication through the X2 or S1 interface.
  • the second RLF indication also carries an identifier, indicating whether the second RLF indication is sent after the UE performs RRC re-establishment, or after the UE initiates a new RRC establishment, and indicates whether the UE has been re-established. Refused.
  • Step 608 The eNB1 performs corresponding processing according to the received second RLF indication.
  • the number of statistics of the abnormal handover type to be determined remains unchanged, or the countdown indication is sent to the eNBO.
  • the eNB1 determines, according to the identifier carried in the second RLF indication, that the second RLF indication is sent after the UE initiates a new RRC establishment, and the UE has been rejected by the re-establishment, but because it is not caused by itself If the radio link fails, the eNB1 determines the previous time according to the RLF report in the second RLF indication.
  • the RLF is a handover parameter problem or a coverage problem
  • it indicates that the previous default statistics are correct and no processing is required; if it is an overlay problem, it indicates that the previous default statistics are wrong, and eNB1 may
  • the problem causing the radio link to fail is that the base station, that is, the eNBO transmits the down-counting indication information, notifying the eNBO to subtract one time from the number of times of handover.
  • Step 609 The eNB0 performs corresponding processing according to the received down-counting indication.
  • the number of statistics for switching too late is reduced by one.
  • the UE When the UE receives the RRC reestablishment request when the RLF occurs, or when the UE initiates the RRC reestablishment request, or when the UE enters the idle state, or when the UE reestablishes the rejection, the UE receives the RRC setup success response message or the UE establishes the RRC establishment timer.
  • the length of time T1 when the RLF report is sent after success, and the time T1 is carried in the down-counting indication.
  • the length between the time when the eNBO receives the down-counting indication and the latest previous parameter adjustment time is assumed to be T3, and the eNBO receives When the countdown indication is reached, if it is determined that T1 ⁇ T3, it is determined that the time for receiving the countdown indication is before the optimization adjustment point, and at this time, the number of statistics for switching too late may be subtracted according to the countdown indication; > ⁇ 3, it is determined that the time of receiving the above-mentioned down-counting indication is after the optimization adjustment point, indicating that the notification is invalid for the current optimization adjustment period, and no adjustment is needed without responding to the notification message.
  • the eNB0 since the time when the eNBO receives the down-counting indication falls within the current statistical adjustment period, that is, the time that the eNBO receives the down-counting indication is before the optimization adjustment point, the eNB0 may switch from too late. Decrement by one in the number of statistics.
  • Steps 701-708 can refer to steps 601-607 in the embodiment shown in FIG. 6, and details are not described herein again.
  • Step 709 The eNB0 performs corresponding processing according to the received down-counting indication.
  • no processing may be performed on the number of times of switching too late, and the number of statistics of the abnormal switching type to be determined remains unchanged.
  • the eNB0 since the time when the eNBO receives the down-counting indication falls outside the current statistical adjustment period, that is, the time when the down-counting indication is received is after the optimization adjustment point, the eNB0 does not perform any processing, so that Ensure that the number of statistics for the determined anomaly switch type remains the same.
  • FIG. 8 to FIG. 9 are flowcharts showing information exchange between the UE and the RLF-enabled base station eNB0, the RRC re-establishment target base station eNB1, and the RRC setup target base station eNB2 when the abnormal handover type of the RLF occurs when the handover is too late.
  • the UE fails to generate a radio link in the cell under the eNBO, does not select a suitable cell for reestablishment, and enters an idle state, and then the UE initiates a new RRC setup request in a cell under the eNB2, and the eNB2 acquires the UE.
  • the RLF indication is sent to the eNBO through the X2 or S1 interface according to the identification information.
  • 8 is a flow chart in which eNB2 transmits an RLF indication to eNBO, and eNB0 receives the indication within its current statistical adjustment period.
  • FIG. 9 shows that eNB2 sends an RLF indication to eNB0, and eNB0 does not receive the indication. The flow chart within this statistical adjustment cycle.
  • the process includes:
  • Step 801 The UE fails to generate a radio link in a cell in the eNB0.
  • Step 802 The UE does not select to camp on the appropriate cell to enter an idle state, and then the UE initiates a new RRC establishment request in a cell under the eNB2.
  • the RRC setup request carries the RLF report or the RLF report indication of the UE.
  • Step 803 After acquiring the RLF report of the UE, the eNB2 sends an RLF indication to the eNBO through the X2 or S1 interface according to the information in the RLF report.
  • the RLF indication also carries an identifier, indicating whether the RLF indication is sent after the UE performs RRC re-establishment, or after the UE initiates a new RRC establishment; and indicates whether the UE has been rejected by the re-establishment.
  • Step 804 The eNB0 performs corresponding processing according to the received RLF indication.
  • the number of times of switching too late statistics may be increased by one or not, and the number of statistics of the abnormal switching type is not changed, and the number of statistics of the abnormal switching type to be determined remains unchanged.
  • the eNBO determines that the RLF indication is sent after the UE initiates a new RRC establishment according to the identifier carried in the RLF indication.
  • the UE initiates a new RRC setup may be a short time after entering the idle state, but may also take a long time, and the handover optimization algorithm performs a handover period adjustment according to the number of statistics, that is, the eNBO receives It may fall within this statistical adjustment period when it comes to RLF indication, or it may fall outside this statistical period.
  • the UE timer can be used, and the startup time is when the UE enters the idle state.
  • the stop time is when the UE sends the RLF report after the RRC setup success message is received by the UE.
  • the eNBO sets the timer recording time length in the RLF indication to T1, and the time and the last time the eNBO receives the RLF indication.
  • the length between the previous parameter adjustment time is T2. If ⁇ 1 ⁇ 2, it is determined that the RLF indication is received within the current adjustment period; if T1>T2, it is determined that the RLF indication may be received when it is received. Outside the statistical adjustment cycle.
  • the eNB0 when the eNB0 receives the RLF indication, it falls within the current adjustment period, and the eNB0 further determines, according to the identifier carried in the RLF indication, whether the UE has been re-established and rejected. In this embodiment, determining that the UE has not Reconstructed and rejected, that is, there is no first RLF indication before, and the data is determined according to the information in the RLF indication, that is, the RLF report, whether the previous RLF is due to the handover parameter problem or the coverage vulnerability problem.
  • the parameter change problem adds one to the number of times the switch is too late; if the problem is covered, no adjustment is made to the number of statistics. Referring to Figure 9, the process includes:
  • Steps 901-903 can refer to steps 801-803 in the embodiment shown in FIG. 8, and details are not described herein again.
  • Step 904 The eNB0 performs corresponding processing according to the received RLF indication.
  • no processing may be performed on the number of times of switching too late, and the number of statistics of the abnormal switching type to be determined remains unchanged.
  • the eNB0 when the eNB0 receives the RLF indication, it has exceeded the optimization adjustment point and falls within the next statistical adjustment period, and the indication message is associated with the RLF event occurring in the previous week. Since the parameter adjustment has been made in the previous cycle, there should be no response to this indication for the next statistical period, that is, no modification is made to the number of too late for this new statistical period.
  • FIG. 10 is a flowchart of information exchange between the UE and the RLF base station eNB0, the RRC reestablishment target base station eNB1, and the RRC setup target base station eNB2 when the UE performs the RLF abnormal handover type as the handover is too early.
  • the UE successfully switches from a cell in the eNB1 to a cell in the eNB0, and the RLF occurs after the cell stays for a short time and initiates a reestablishment request to the base station eNB1 to which the source cell belongs.
  • the eNB1 The eNB0 first sends an RLF indication to the eNBO.
  • the eNB0 determines that the handover is too early according to the latest successful handover of the UE to the RLF occurrence length, that is, sends a Handover report to the eNB1, so that the eNB1 side increases the handover premature statistics once.
  • the UE fails to establish a radio link in the cell under the eNBO, and selects a cell to be re-established in the eNB1. After the reestablishment is denied to enter the idle state, the UE may successfully establish a new RRC connection in the eNB2, and the eNB2 may obtain the RLF report of the UE.
  • the RLF indication (FIG. 10, FIG. 11) may be sent according to the base station eNB0 in which the RLF is generated, that is, the parameter setting may be incorrect.
  • the base station eNB1 that initiates the re-establishment may also send the RLF indication (FIG. 12, FIG. 13). ).
  • FIG. 10 is a flowchart in which the eNB2 transmits a second RLF indication to the eNB0, the eNBO determines the cause of the radio link failure, and the time when the eNB1 receives the down-counting indication sent by the eNB0 within its current statistical adjustment period;
  • the eNB2 sends a second RLF indication to the eNB0, the eNB0 determines the cause of the radio failure, and the eNB1 receives the flowchart that the time of the down-counting indication sent by the eNB0 is not within the current statistical adjustment period;
  • FIG. 12 is the second line sent by the eNB2 to the eNB1.
  • FIG. 13 is that the eNB2 sends a second RLF indication to the eNB1, and the time when the eNB0 receives the indication is not in its current statistical adjustment period.
  • the process includes:
  • Step 1001 The UE successfully switches from eNB1 to eNB0;
  • Step 1002 The radio link fails after the UE temporarily stays at the eNB0;
  • Step 1003 The UE selects a cell under the eNB1 to perform a reconstruction request.
  • Step 1004 The eNB1 rejects the reestablishment request of the UE.
  • Step 1005 The eNB1 sends the first RLF indication that does not include the RLF report to the eNB0.
  • the first RLF indication carries an identifier, where the first RLF indication is sent by the UE after the RRC reestablishment, or is sent by the UE after the new RRC is established, and the first RLF indication is also carried.
  • the flag indicates whether the UE has been rejected by the rebuild.
  • the above two identifiers may be implemented by using the same identifier, or may be implemented by using different identifiers. This embodiment is not limited thereto.
  • the RLF indication is sent after the UE performs RRC re-establishment, and it is not necessary to determine whether the UE has been rejected by the re-establishment.
  • Step 1006 The eNB0 determines that the handover is too early according to the length of time before the previous handover succeeds to the occurrence of the RLF. The default is that the handover caused by the handover parameter problem is too early, so that the eNB0 sends a Handover report to the eNB1, indicating that the eNB1 increases the handover too early;
  • the RLF indication is sent after the UE performs the RRC re-establishment, and the RLF indication does not have the RLF report. Therefore, in this embodiment, the handover is premature due to the handover parameter problem, and the eNBO does not cause the radio. If the base station fails, the eNB0 sends a Handover report to the problem base station eNB1 that causes the radio link to fail, instructing the eNB1 to increase the number of premature handovers by one time.
  • Step 1007 The eNB1 increases the number of premature statistics of the handover by one time;
  • the eNB1 increases the number of premature statistics of the handover by one time according to the indication in the Handover report.
  • Step 1008 The UE initiates a new RRC establishment at eNB2.
  • the RLF report or the RLF report indication is included in the RRC connection request.
  • Step 1009 The eNB2 sends the second RLF indication with the RLF report to the eNB0 through the X2 or the S1.
  • the second RLF indication also carries the identifier, indicating that the second RLF indication is sent after the UE performs RRC re-establishment. , or sent after the UE initiates a new RRC setup; and indicates whether the UE has been rejected by the rebuild.
  • Step 1010 The eNB0 performs corresponding processing according to the received second RLF indication.
  • the down count indication may be sent to the eNB1 or the processing of the premature statistics is not performed, and the number of statistics of the abnormal switch type to be determined remains unchanged.
  • the eNBO determines that the second RLF indication is sent after the UE initiates a new RRC establishment.
  • the eNBO does not need to determine whether the time when the second RLF indication is received is within the current statistical adjustment period, but is further based on the RLF.
  • the identifier carried in the indication determines whether the UE has been rejected by the re-establishment. In this embodiment, it is determined that the UE has been rejected by the re-establishment, that is, the first RLF indication has been previously performed, and the eNBO is based on the RLF in the second RLF indication.
  • the report determines whether the previous RLF is due to a handover parameter problem or a coverage problem. If it is indeed a handover parameter problem, it indicates that the previous default statistics are correct and no processing is required; if it is an overlay problem, it indicates that the previous default statistics are incorrect.
  • the eNB0 may send the indication information to the problem base station eNB1 that causes the radio link to fail, and notify the eNB1 to subtract the premature statistics from the handover.
  • Step 1011 The eNB1 performs corresponding processing according to the received down-counting indication.
  • the number of pre-emptive statistics is reduced by one.
  • the eNB1 When the eNB1 receives the down-counting indication, if it is determined that T1 ⁇ T3, it is determined that the received down-counting indication is before the optimized adjustment point, and may be decremented from the pre-stated number of times according to the down-counting indication; if it is determined that ⁇ 1> ⁇ 3, it is determined that the receipt of the down-counting indication is after the optimization of the adjustment point, that is, the indication is invalid for the current optimization adjustment period, and no adjustment is made to the number of statistics without responding to the notification message.
  • the time when the eNB1 receives the down count indication is within its current statistical adjustment period. Based on the down-counting indication, the eNB1 subtracts the counted number of premature switchings.
  • the process includes:
  • Steps 1101-1110 may refer to steps 1001-1010 in the embodiment shown in FIG. 10, and details are not described herein again.
  • Step 1111 The eNB1 performs corresponding processing according to the received down-counting indication.
  • no processing may be performed on the number of premature statistics switching, and the number of statistics of the abnormal switching type to be determined remains unchanged.
  • the eNB1 since the time when the eNB1 receives the down-counting indication falls outside the current statistical adjustment period, that is, the time when the above-mentioned down-counting indication is received is after the optimization adjustment point, the eNB1 does not perform any processing to Ensure that the number of statistics for the determined anomaly switch type remains the same.
  • the process includes:
  • steps 1201-1208 reference may be made to the steps 1001-1008 in the embodiment of FIG. 10, and details are not described herein again.
  • Step 1209 The eNB2 sends a second RLF indication with the RLF report to the eNB1 through X2 or S1.
  • the second RLF indication also carries the identifier, indicating that the second RLF indication is sent after the UE performs RRC re-establishment. , or sent after the UE initiates a new RRC setup; and indicates whether the UE has been rejected by the rebuild.
  • Step 1210 The eNB1 performs corresponding processing according to the received second RLF indication.
  • the number of premature statistics of the handover may be decreased by 1 or the number of premature statistics of the handover is not processed, and the number of statistics of the abnormal handover type to be determined remains unchanged.
  • the eNB1 determines that the second RLF indication is sent after the UE initiates a new RRC establishment, according to the identifier carried in the second RLF indication.
  • eNB1 should consider whether the time of receiving the second RLF indication is before or after optimizing the adjustment point.
  • T1 the time length recorded by the UE side timer defined above, the length between the time when the eNB1 receives the second RLF indication and the latest previous parameter adjustment time is T2, and when the eNB1 receives the second with the RLF report
  • Tl ⁇ ⁇ 2 the time of receiving the second RLF indication is before the optimization adjustment point; if it is judged that T1>T2, it is determined that the time of receiving the second RLF indication is After optimizing the adjustment point, it indicates that this notification is invalid for the current optimization adjustment period, and there is no need to respond to this notification message without making any adjustments to the statistics.
  • the eNB1 before the second RLF indication is received, the eNB1 further determines, according to the identifier carried in the second RLF indication, whether the UE has been re-established and rejected. In this embodiment, In the process, it is determined that the UE has been rejected by the re-establishment, that is, the first RLF indication has been previously performed, and the eNB1 is the problematic base station that is too early to switch, and the e1 report is determined according to the RLF report in the second RLF indication.
  • the secondary RLF is due to the handover parameter problem or the coverage problem. If it is indeed a handover parameter problem, it indicates that the previous default statistics are correct and no processing is required; if it is an overlay problem, it indicates that the previous default statistics are wrong, and the eNB1 is switched. Subtracted from the number of premature times.
  • the process includes:
  • Steps 1301-1309 may refer to steps 1201-1209 in the embodiment shown in FIG. 12, and details are not described herein again.
  • Step 1310 The eNB1 performs corresponding processing according to the received second RLF indication.
  • no processing may be performed on the number of premature statistics switching, and the number of statistics of the abnormal switching type to be determined remains unchanged.
  • the eNB1 after receiving the second RLF indication, after the optimization adjustment point, it indicates that the notification is invalid for the current optimization adjustment period, and the eNB1 does not make any adjustment to the statistics number without responding to the notification message.
  • 14-15 is another application scenario in which the handover is too early, that is, the handover failure occurs in the process of the UE switching from the eNB0 to the eNB1, and then the UE reestablishes the eNBO to be rejected, and then the UE initiates a new RRC establishment to the eNB2.
  • 14 is a schematic diagram of the time when the eNB2 sends the RLF indication to the eNB2, and the time when the eNB0 receives the RLF indication is within the current statistical adjustment period.
  • FIG. 15 is that the eNB2 sends the RLF indication to the eNB0, and the time when the eNB0 receives the RLF indication is not present. Schematic diagram of this statistical adjustment cycle.
  • Step 1401 A handover failure occurs during handover of the UE from the eNB0 to the eNB1.
  • Step 1402 The UE selects a cell under the eNBO to perform a reconstruction request.
  • Step 1403 The eNBO rejects the reestablishment request of the UE.
  • the eNB0 is the problem base station in the handover process, and the UE re-establishes the problem base station. Therefore, if the handover caused by the default handover parameter problem is too early, the eNBO adds 1 to the premature statistics.
  • Step 1404 The UE initiates a new RRC establishment at eNB2.
  • the RLF report or the RLF report indication is included in the RRC connection request.
  • Step 1405 eNB2 sends an RLF indication with an RLF report to the eNB0 through X2 or S1, where the second RLF indication carries an identifier, indicating whether the RLF indication is sent after the UE performs RRC re-establishment, or is initiated by the UE. Transmitted after the RRC is established; and indicates whether the UE has been rejected by the rebuild.
  • Step 1406 The eNB0 performs corresponding processing according to the received second RLF indication.
  • the number of premature statistics of the handover may be decremented by 1 or the number of premature statistics of the handover is not processed, and the number of statistics of the abnormal handover type to be determined remains unchanged.
  • the eNBO determines that the RLF indication is sent after the UE initiates a new RRC establishment according to the identifier carried in the RLF indication.
  • eNBO should consider whether the time of receiving the RLF indication is before or after the optimization adjustment point.
  • T1 recorded by the UE side timer defined above
  • the length between the time when the eNBO receives the RLF indication and the latest previous parameter adjustment time is T2 when the eNB0 receives the RLF indication with the RLF report, If it is determined that T1 ⁇ T2, it is determined that the time of receiving the RLF indication is before the optimization adjustment point; if it is determined that T1>T2, it is determined that the time of receiving the RLF indication is after the optimization adjustment point, indicating that the notification is adjusted for the current optimization. The period is invalid, no response to this notification message does not make any adjustments to the number of statistics.
  • the time when the RLF indication is received is before the optimization of the adjustment point, and the eNB0 further determines, according to the identifier carried in the RLF indication, whether the UE has been re-established and rejected. In this embodiment, determining that the UE has been Reconstruction refused, although there is no first RLF indication before, but since the reconstructed base station is the same as the problem base station, that is, eNBO, the problem base station has already made the default radio link failure reason processing, then eNBO according to the The RLF report in the RLF indication determines whether the previous RLF is due to a handover parameter problem or a coverage problem.
  • the process includes:
  • Step 1505 The eNB0 performs corresponding processing according to the received second RLF indication.
  • no processing may be performed on the number of premature statistics switching, and the number of statistics of the abnormal switching type to be determined remains unchanged.
  • the optimization adjustment point after receiving the RLF indication, after the optimization adjustment point, it indicates that the notification is invalid for the current optimization adjustment period, and does not need to respond to the notification message, and the eNBO does not make any adjustment to the statistics.
  • the eNB2 may also send an RLF indication to the eNB1, and the eNB1 determines whether to perform no processing or according to the identifier in the RLF indication.
  • the eNBO sends a down-counting indication, so that the problem base station eNB0 decides whether to increase the number of premature statistics of the handover by 1 according to whether the delivery time of the down-counting indication is within its current statistical adjustment period, or does not perform any processing.
  • This embodiment is similar to the processing of the embodiment of FIG. 6 and FIG. 7, and details are not described herein again.
  • FIG. 16 to FIG. 17 are flowcharts of information exchange between the UE and the base station eNB0, the problem base station eNB1, the RRC reestablishment target base station eNB2, and the RRC setup target base station eNB3 when the RLF abnormal handover type is switched to the wrong cell.
  • the UE successfully switches from a cell in the eNB1 to a cell in the eNB0, and after the short stay of the cell occurs, the RLF occurs, and then the eNB2 initiates a reestablishment request.
  • the eNB2 first sends the eNB2 to the eNB2.
  • the eNBO side determines that the handover to the wrong cell is based on the length of time before the previous handover succeeds until the RLF occurs and the cell identity, and the eNB0 sends a handover report to the eNB1 to cause the base station eNB1 to which the problem cell belongs to switch to the error cell once.
  • the eNB3 may send a second RLF indication to the eNB0 where the RLF is generated according to the identifier information in the RLF report (FIG. 16, FIG. 17);
  • the eNB2 sends a second RLF indication; or sends a second RLF indication to the problem base station, that is, the base station eNB1 that should perform parameter adjustment optimization.
  • FIG. 16 is a flowchart in which the eNB3 sends a second RLF indication to the eNB0, and the time when the eNB1 receives the down-counting indication sent by the eNB0 within its current statistical adjustment period;
  • FIG. 17 shows that the eNB3 sends the second RLF to the eNB0.
  • Indication a flowchart in which the eNB1 receives the countdown indication sent by the eNB0 is not within its current statistical adjustment period.
  • Step 1601 The UE successfully switches from eNB1 to eNB0;
  • Step 1602 The UE generates an RLF after a short stay of the eNB0.
  • Step 1603 The UE selects a cell under the eNB2 to perform a reconstruction request.
  • Step 1604 eNB2 rejects the reestablishment request of the UE
  • Step 1605 The eNB2 sends the first RLF indication that does not include the RLF report to the eNB0.
  • the RLF indication carries an identifier, indicating that the RLF indication is sent by the UE after RRC re-establishment. The sent is also sent after the UE initiates a new RRC setup. At the same time, the RLF indication also carries an identifier indicating whether the UE has been rejected by the re-establishment.
  • the above two identifiers may be implemented by using the same identifier, or may be implemented by using different identifiers. This embodiment is not limited thereto.
  • the RLF indication is sent after the UE performs RRC re-establishment, and it is not necessary to determine whether the UE has been rejected by the re-establishment.
  • Step 1606 The eNB0 side determines that the handover to the wrong cell is performed according to the length of time before the previous handover succeeds to the RLF, and the eNB0 sends a handover report to the eNB1 to cause the base station eNB1 of the problem cell to switch to the error cell once; wherein, due to the RLF indication It is sent after the UE performs RRC re-establishment, and there is no RLF report in the RLF indication. Therefore, in this embodiment, the handover is too early due to the handover parameter problem, and since the eNBO is not the problem base station, the eNBO is the problem.
  • the base station eNB1 sends a Handover report, instructing the eNB1 to increase the number of premature statistics of the handover by one time.
  • Step 1607 eNB1 increases the number of times of switching to the error cell statistics once;
  • the eNB1 increases the number of premature statistics of the handover by one time according to the indication in the Handover report.
  • Step 1608 The UE initiates a new RRC establishment at the eNB3.
  • the RLF report or the RLF report indication is included in the RRC connection request.
  • Step 1609 The eNB3 sends the second RLF indication with the RLF report to the eNB0 through the X2 or the S1.
  • the second RLF indication also carries the identifier, indicating that the second RLF indication is sent after the UE performs the RRC reestablishment. , or sent after the UE initiates a new RRC setup; and indicates whether the UE has been rejected by the rebuild.
  • Step 1610 The eNB0 performs corresponding processing according to the received second RLF indication.
  • the down-counting indication may be sent to the eNB1 or no processing is performed on the number of times of switching to the wrong cell statistics, and the number of statistics of the abnormal switching type to be determined remains unchanged.
  • step 1010 The step is similar to step 1010, and details are not described herein again.
  • Step 1611 The eNB1 performs corresponding processing according to the received down-counting indication.
  • the number of times of switching to the error cell statistics is reduced by 1.
  • step 1011 The step is similar to step 1011, and details are not described herein again.
  • Steps 1701-1710 may refer to steps 1601-1610 in the embodiment shown in FIG. 16, and details are not described herein again.
  • Step 1711 The eNB1 performs corresponding processing according to the received down-counting indication.
  • step 1111 no processing is performed on the number of times of switching to the error cell statistics, and the number of statistics of the abnormal switching type to be determined remains unchanged. This step is similar to step 1111 and will not be described here.
  • the eNB3 may also send an RLF indication to the eNB2, and the eNB2 determines whether to perform no processing or according to the identifier in the RLF indication.
  • the eNB1 sends a down-counting indication, so that the problem base station eNB1 decides whether to add 1 to the error cell statistics number according to whether the time-receiving indication time is within its current statistical adjustment period, or does not perform any processing.
  • This embodiment is similar to the processing of the embodiment of FIG. 6 and FIG. 7, and details are not described herein again.
  • the eNB3 may also send the RLF indication to the problem base station eNB1, and the eNB1 according to whether the time of receiving the RLF indication is in its current time. If the time when the eNB1 receives the RLF indication is within its current statistical adjustment period, it is determined according to the RLF report in the RLF indication whether the cause of the radio link failure is the default handover parameter. The problem is that if it is, no processing is performed. If not, the number of times of switching to the error cell statistics is reduced by one; if the time when the eNB1 receives the RLF indication is not within the current statistical adjustment period, no processing is performed. This embodiment is similar to the processing of the embodiment of FIG. 12 and FIG. 13, and details are not described herein again.
  • 18 to FIG. 19 are another application scenario of handover to an erroneous cell, that is, a handover failure occurs when the UE switches from eNB0 to eNB1, and then the UE reestablishes to eNB2, and then the UE initiates a new RRC establishment to eNB3.
  • 18 is a schematic diagram of eNB3 transmitting a second RLF indication to eNB0, and eNBO receiving the second RLF indication within the current statistical adjustment period;
  • FIG. 19 is a eNB3 transmitting a second RLF indication to eNB0. The time when the time when the eNBO receives the second RLF indication is not within the current statistical adjustment period.
  • the process includes:
  • Step 1801 A handover failure occurs when the UE switches from eNB0 to eNB1.
  • Step 1802 The UE selects a cell under the eNB2 to perform a reconstruction request.
  • Step 1803 eNB2 rejects the reestablishment request of the UE.
  • Step 1804 The eNB2 sends the first RLF indication that does not include the RLF report to the eNB0.
  • the RLF indication carries an identifier, where the RLF indication is sent by the UE after the RRC re-establishment, or is sent by the UE after the new RRC is established, and the RLF indication further carries an identifier, indicating whether the UE has been re-established or not. Over.
  • the above two identifiers may be implemented by using the same identifier, or may be implemented by using different identifiers. This embodiment is not limited thereto.
  • the RLF indication is sent after the UE performs RRC re-establishment, and it is not necessary to determine whether the UE has been rejected by the re-establishment.
  • Step 1805 The eNBO default radio link failure cause is a handover parameter.
  • the eNB0 is identified according to the identifier in the first RLF indication. Increase the number of statistics to switch to the wrong cell once.
  • the RLF indication is sent after the RRC re-establishment of the UE, and the RLF indication does not include the RLF report. Therefore, determining the cause of the radio link failure is the default handover parameter problem, and the number of handovers to the wrong cell statistics is increased by one.
  • Step 1806 eNBO initiates a new RRC establishment at eNB3.
  • the RLF report or the RLF report indication is included in the RRC connection request.
  • Step 1807 The eNB3 sends an RLF indication with an RLF report to the eNB0 through X2 or S1, where the second RLF indication carries an identifier, indicating whether the RLF indication is sent after the UE performs RRC re-establishment, or whether the UE initiates a new one. Transmitted after the RRC is established; and indicates whether the UE has been rejected by the rebuild.
  • Step 1808 The eNB0 performs corresponding processing according to the received second RLF indication.
  • the number of premature statistics of the handover may be decreased by 1 or the number of statistics of the handover to the error cell is not processed, and the number of statistics of the abnormal handover type to be determined remains unchanged.
  • the eNBO determines that the RLF indication is sent after the UE initiates a new RRC establishment according to the identifier carried in the second RLF indication.
  • eNBO should consider whether the time of receiving the RLF indication is before or after the optimization adjustment point.
  • T1 recorded by the UE side timer defined above
  • the length between the time when the eNBO receives the RLF indication and the latest previous parameter adjustment time is T2 when the eNB0 receives the RLF indication with the RLF report, If it is determined that Tl ⁇ ⁇ 2, it is determined that the time of receiving the RLF indication is before the optimization adjustment point; if it is judged that T1>T2, it is determined that the time of receiving the RLF indication is after the optimization adjustment point, indicating that the notification is adjusted for the current optimization. The period is invalid, no response to this notification message does not make any adjustments to the number of statistics.
  • the time when the RLF indication is received is before the optimization of the adjustment point, and the eNB0 further determines, according to the identifier carried in the second RLF indication, whether the UE has been re-established and rejected. In this embodiment, determining The UE has been re-rejected and rejected, that is, the first RLF indication has been used before, and the UE1 determines whether the previous RLF is due to a handover parameter problem or a coverage problem according to the RLF report in the RLF indication.
  • the process includes:
  • Steps 1901-1907 The same as steps 1801-1807, and will not be described here;
  • Step 1908 The eNB0 performs corresponding processing according to the received second RLF indication.
  • no processing may be performed on the number of times of switching to the error cell statistics, and the abnormal switching to be determined is also determined.
  • the number of statistics for the type remains the same.
  • the eNB0 after the eNB0 receives the second RLF indication time after the optimization adjustment point, it indicates that the notification is invalid for the current optimization adjustment period, and does not need to respond to the notification message, and the eNBO does not make any adjustment to the statistics.
  • the eNB 3 may also send a second RLF indication to the eNB1 or the eNB2, and the eNB1 or the eNB2 according to the second RLF indication.
  • the identifier determines whether to perform any processing or send a down-counting indication to the eNBO, so that the problem base station eNBO decides to increase the number of times of switching to the error cell statistic by 1 according to whether the time of receiving the down-counting indication time is within its current statistical adjustment period. Still do not do anything.
  • This embodiment is similar to the processing of the embodiment of FIG. 6 and FIG. 7, and details are not described herein again.
  • the eNB 3 may also send a second RLF indication to the problem base station eNBO, and the eNBO receives the second RLF indication according to the second RLF indication.
  • the time is determined within the current statistical adjustment period, for example, if the time when the eNBO receives the second RLF indication is within its current statistical adjustment period, then according to the RLF report in the second RLF indication Determining whether the cause of the radio link failure is the default handover parameter problem, if yes, no processing is performed, if not, the number of handovers to the wrong cell statistics is reduced by 1; if the time when the eNBO receives the second RLF indication is not Within this statistical adjustment cycle, no processing is done.
  • This embodiment is similar to the processing of the embodiment of FIG. 12 and FIG. 13, and details are not described herein again.
  • FIG 20 is a block diagram of a processing device for a radio link failure indication (RLF indication) according to an embodiment of the present invention.
  • the device may be included in a base station.
  • the device includes:
  • a first receiving unit 2001 configured to receive an RLF indication
  • a first determining unit 2002 configured to determine, according to the first identifier carried in the RLF indication, a sending occasion of the RLF indication
  • the first processing unit 2003 is configured to: after the RLF indication is sent after the UE performs the RRC re-establishment, and the RLF indication does not include the RLF report, determine that the radio link failure cause is a handover parameter problem, according to the The number of statistics of the abnormal switching type determined by the RLF indication is increased by one.
  • the first processing unit 2003 is specifically configured to: directly add 1 to a statistical number of abnormal handover types determined according to the RLF indication; or send a handover report to a problem base station that causes a radio link failure, indicating the The problem base station adds 1 to the number of statistics of the abnormal handover type determined according to the RLF indication.
  • the apparatus may further include:
  • a second determining unit 2004, configured to: after the RLF indication is sent after the UE performs a new RRC setup, and the RLF indication includes the RLF report, determine according to the second identifier carried in the RLF indication Whether the UE was rejected by the rebuild.
  • a second processing unit 2005 configured to determine, according to the RLF report, a radio link failure reason when the second determining unit determines that the UE is re-established, if the radio link failure cause is a handover parameter problem, the determined The number of statistics of the abnormal handover type remains unchanged; if the radio link failure cause is not a handover parameter problem, the number of statistics of the abnormal handover type determined according to the RLF indication is decremented by one.
  • the first identifier and the second identifier are the same identifier or different identifiers.
  • the second processing unit 2005 is specifically configured to: when the radio link failure reason is not a handover parameter problem, send a down count indication to the base station that keeps the determined statistics of the abnormal handover type unchanged, indicating the location The problem base station decrements the number of statistics of the abnormal handover type determined according to the RLF indication by one.
  • a third processing unit 2006 configured to: when the second determining unit determines that the UE is not re-established and refuses to pass, according to the
  • the RLF report determines the cause of the failure of the radio link. If the cause of the failure of the radio link is a handover parameter problem, the number of statistics of the abnormal handover type corresponding to the RLF indication is increased by one; if the cause of the radio link failure is not a handover parameter problem , the number of statistics of the determined abnormal switch type remains unchanged.
  • the apparatus may further include:
  • the third determining unit 2007 is configured to determine whether the time when the RLF indication is received is within the current statistical adjustment period, and if the time when the RLF indication is received is within the current statistical adjustment period, The determining unit determines whether the UE is re-established and rejected according to the second identifier carried in the RLF indication; if the time when the RLF indication is received is not within the current statistical adjustment period, the number of statistics of the abnormal switching type to be determined is determined. constant.
  • the third determining unit 2007 may include:
  • the first comparison module 20071 is configured to compare a length of time recorded by the UE timer in the RLF report with a locally calculated length of time from receiving the RLF indication to a recent previous statistical adjustment time; a determining module 20072, configured to determine, when the comparison result of the first comparison module is that the length of time recorded by the UE timer is less than the locally calculated time length, the time of receiving the RLF indication in the current statistics During the adjustment period; when the comparison result of the comparison module is that the time length recorded by the UE timer is greater than the locally calculated time length, it is determined that the time when the RLF indication is received is not in the current statistical adjustment period.
  • the start time of the time length recorded by the UE timer is: when the UE generates RLF or when the UE initiates an RRC reestablishment request or when the UE enters an idle state or when the UE reestablishes the rejection; the UE timer record The end time of the time length is: when the UE receives the RRC setup success response message or the UE sends the RLF report after the RRC setup success. Time.
  • the apparatus may further include:
  • a second receiving unit 2008 configured to cut an abnormality determined according to the RLF indication at the first processing unit After the number of statistics of the type of the change is increased by 1, the down count indication sent by the RRC reestablishment target base station is received;
  • a fourth determining unit 2009 configured to determine whether the time when the second receiving unit receives the down counting indication is within the current statistical adjustment period
  • the fourth processing unit 2010 is configured to: when the fourth determining unit determines that the time when the second receiving unit receives the down counting indication is within the current statistical adjustment period, the number of statistics is decreased by 1; The fourth determining unit determines that the time when the second receiving unit receives the down counting indication is not within the current statistical adjustment period, and the determined statistical number of abnormal switching types remains unchanged.
  • the fourth processing unit 2010 may include:
  • the second comparison module 20101 compares a length of time recorded by the UE timer in the down-counting indication with a locally calculated length of time from receiving the down-counting indication to the most recent previous statistical adjustment time;
  • the second determining module 20102 is configured to: when the comparison result of the second comparison module is that the time length of the UE timer record is less than the locally calculated time length, determining that the second receiving unit receives the subtraction The time indicated by the counting is within the current statistical adjustment period; when the comparison result of the second comparison module is that the time length recorded by the UE timer is greater than the locally calculated time length, determining the second receiving unit The time when the down count indication is received is not within the current statistical adjustment period;
  • the start time of the time length recorded by the UE timer is: when the UE generates the RLF or when the UE initiates the RRC reestablishment request or when the UE enters the idle state or the UE reestablishes the rejection; the length of time recorded by the UE timer
  • the end time is: when the UE receives the RRC setup success response message or when the UE sends the RLF report after the RRC setup succeeds.
  • FIG. 21 is a structural block diagram of a processing apparatus for a radio link failure indication (RLF indication) according to an embodiment of the present invention.
  • the apparatus includes:
  • the first receiving unit 211 is configured to receive a handover report that is sent by the base station that generates the RLF after receiving the RLF indication.
  • the first processing unit 212 is configured to: according to the handover report received by the first receiving unit, indicate in the handover report The number of statistics for the abnormal switch type is increased by one.
  • the apparatus may further include:
  • the second receiving unit 213 is configured to: after the first processing unit adds the number of statistics of the abnormal handover type indicated in the handover report to 1 according to the handover report received by the first receiving unit, receive the base station that sends the RLF to send Countdown Instruction
  • the determining unit 214 is configured to determine whether the time when the second receiving unit receives the down counting indication is within the current adjustment period
  • a second processing unit 215, configured to: when the determining unit determines that the time that the second receiving unit receives the down counting indication is within the current statistical adjustment period, subtract the statistical number by one; The determining unit determines that the time when the second receiving unit receives the down counting indication is within the current statistical adjustment period, and the determined statistical number of abnormal switching types remains unchanged.
  • the determining unit 214 can include:
  • a comparison module 2141 configured to use a time length recorded by the UE timer in the down-counting indication received by the second receiving unit, and a locally calculated from the receipt of the down-counting indication to the latest previous statistical adjustment time The length of time is compared;
  • a determining module 2142 configured to determine, when the comparison result of the comparison module is that the time length recorded by the UE timer is less than the locally calculated time length, the time that the second receiving unit receives the down count indication In the current statistical adjustment period; when the comparison result of the comparison module is that the time length recorded by the UE timer is greater than the locally calculated time length, determining that the second receiving unit receives the down count The indicated time is not within the current adjustment period;
  • the start time of the time length recorded by the UE timer is: when the UE generates the RLF or when the UE initiates the RRC reestablishment request or when the UE enters the idle state or the UE reestablishes the rejection; the length of time recorded by the UE timer
  • the end time is: when the UE receives the RRC setup success response message or when the UE sends the RLF report after the RRC setup succeeds.
  • the components of the device in this embodiment are respectively used to implement the steps of the method of the embodiment shown in FIG. 3, and in the embodiment shown in FIG. 3, the steps have been described in detail, and no longer Narration.
  • the steps of a method or algorithm described in connection with the embodiments disclosed herein can be implemented directly in hardware, a software module executed by a processor, or a combination of both.
  • the software module can be placed in random access memory (RAM), memory, read only memory (ROM), electrically programmable ROM, electrically erasable programmable ROM, registers, hard disk, removable disk, CD-ROM, or technical field. Any other form of storage medium known.

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Description

无线链路失败指示的处理方法和装置 技术领域
本发明涉及通信领域， 尤其涉及一种无线链路失败指示的处理方法和装置。 背景技术
3GPP R9 (The 3rd Generation Partnership Project R9， 第三代合作伙伴计划第 9版本） 协 议中定义了几种由于切换参数设置不当造成移动性优化场景， 即切换过晚场景、 切换过早场 景及切换到错误小区场景， 通过周期性地对这些异常切换场景的识别统计， 到优化调整周期 到达时对切换参数进行调整以减少或避免这些异常切换场景。
根据 R9 (Release9, 第 9版本） 规定， 在以上异常切换场景下， 无论 UE的重建是否成 功， 重建目标基站都会给源基站发送 RLF indication ( Radio Link Failure indication， 无线链路 失败指示）， 该 RLF indication中可能包括也可能不包括 RLF Report (无线链路失败报告）。然 而， 根据 RIO (ReleaselO, 第 10版本）规定， UE在 RLF后未成功选到小区或重建失败进入 空闲态， 随后成功建立了新的 RRC连接， 若其中 UE中保存有 RLF Report, RRC建立目标基 站会根据 RLF Report内容向先前发生 RLF小区发送 RLF Indication 由于源基站是根据收到 的 RLF Indication来统计切换过晚或覆盖漏洞， 因此， 若 UE在 RRC重建时和后续 RRC建立 时都发送这个 RLF Indication, 就可能重复统计， 或者 RRC重建时不发而等到后续 RRC建立 时发送， 又可能会有统计遗漏。
目前， 一种解决方案是对于那些拒绝了 UE RRC 重建的基站， 将不必立即发送 RLF indication, 而是等到认为后续 UE发起新的 RRC建立时不会上报 RLF Report时才向源发生 RLF的基站发送 RLF indication 由于这种方案要求拒绝 RRC重建的基站必须等待， 即要在 基站上设置定时器， 而如果基站下的 UE很多且发生这种状况的 UE较多， 那么基站侧要维 护的定时器会很多， 造成了资源浪费。 发明内容
本发明实施例提供一种无线链路失败指示的处理方法和装置， 以在满足能够正确区分无 线链路失败原因的前提下， 减少基站侧过多信息存储以及资源浪费。
一方面， 本发明实施例提供一种无线链路失败指示的处理方法， 所述方法包括： 接收无 线链路失败指示； 根据所述无线链路失败指示中携带的标识确定所述无线链路失败指示的发 送时机； 如果所述无线链路失败指示是在 UE进行 RRC重建后发送的， 且所述无线链路失败 指示中不包含无线链路失败报告， 确定无线链路失败原因为切换参数问题， 将根据所述无线 链路失败指示确定的异常切换类型的统计次数加 1。
另一方面， 本发明实施例提供一种无线链路失败指示的处理装置， 所述装置包括： 第一 接收单元， 用于接收无线链路失败指示； 第一确定单元， 用于根据所述无线链路失败指示中 携带的标识确定所述无线链路失败指示的发送时机； 第一处理单元， 用于在所述无线链路失 败指示是在 UE进行 RRC重建后发送的， 且所述无线链路失败指示中不包含无线链路失败报 告时， 确定无线链路失败原因为切换参数问题， 将根据所述无线链路失败指示确定的异常切 换类型的统计次数加 1。
再一方面， 本发明实施例提供一种无线链路失败指示的处理方法， 所述方法包括： 接收 发生 RLF的基站在接收到无线链路失败指示后发送的切换报告； 根据所述切换报告将切换报 告中指示的异常切换类型的统计次数加 1。
又一方面， 本发明实施例提供一种无线链路失败指示的处理装置， 所述装置包括： 第一 接收单元， 用于接收发生 RLF的基站在接收到无线链路失败指示后发送的切换报告； 第一处 理单元， 用于根据所述第一接收单元接收到的切换报告， 将切换报告中指示的异常切换类型 的统计次数加 1。
通过本发明实施例提供的方法和装置， 可以在满足能够正确区分统计切换参数问题和覆 盖漏洞问题的前提下， 减少基站侧过多信息存储以及资源浪费。 附图说明
此处所说明的附图用来提供对本发明的进一步理解， 构成本申请的一部分， 并不构成对 本发明的限定。 在附图中：
图 1为本发明一个实施例的方法流程图；
图 2为本发明另一实施例的方法流程图；
图 3为本发明再一实施例的方法流程图；
图 4为本发明实施例中切换过晚时收到第二条无线链路失败指示的时间在本次统计调整 周期之内的处理方法流程图；
图 5为本发明实施例中切换过晚时收到第二条无线链路失败指示的时间不在本次统计调 整周期之内的处理方法流程图；
图 6为本发明实施例中切换过晚时收到减计数指示的时间在本次统计调整周期之内的处 理方法流程图；
图 7为本发明实施例中切换过晚时收到减计数指示的时间不在本次统计调整周期之外的 处理方法流程图；
图 8为本发明实施例中切换过晚时 UE未选到合适小区且收到无线链路指示的时间在本 次统计调整周期之内的处理方法流程图；
图 9为本发明实施例中切换过晚时 UE未选到合适小区且收到无线链路指示的时间不在 本次统计调整周期之内的处理方法流程图；
图 10为本发明实施例中切换过早时收到减计数指示的时间在本次统计调整周期之内的 处理方法流程图；
图 11为本发明实施例中切换过早时收到减计数指示的时间不在本次统计调整周期之内 的处理方法流程图；
图 12为本发明实施例中切换过早时收到无线链路失败指示的时间在本次统计调整周期 之内的处理方法流程图；
图 13为本发明实施例中切换过早时收到无线链路失败指示的时间不在本次统计调整周 期之内的处理方法流程图；
图 14为本发明实施例中切换过程中发生切换失败的切换过早情况下，收到第二条无线链 路失败指示的时间在本次统计调整周期之内的处理方法流程图；
图 15为本发明实施例中切换过程中发生切换失败的切换过早情况下，收到第二条无线链 路失败指示的时间不在本次统计调整周期之内的处理方法流程图；
图 16为本发明实施例中切换到错误小区时接收到发生 RLF的基站发送的减计数指示的 时间在本次统计调整周期之内的处理方法流程图；
图 17为本发明实施例中切换到错误小区时接收到发生 RLF的基站发送的减计数指示的 时间不在本次统计调整周期之内的处理方法流程图；
图 18为本发明实施例中切换过程中发生切换失败的切换到错误小区情况下， 接收到无 线链路失败指示的时间在本次统计调整周期之内的处理方法流程图；
图 19为本发明实施例中切换过程中发生切换失败的切换到错误小区情况下， 接收到无 线链路失败指示的时间不在本次统计调整周期之内的处理方法流程图；
图 20为本发明一实施例的装置组成框图；
图 21为本发明另一实施例的装置组成框图。 具体实施方式
为使本发明实施例的目的、 技术方案和优点更加清楚明白， 下面结合实施例和附图， 对 本发明实施例做进一步详细说明。 在此， 本发明的示意性实施例及其说明用于解释本发明， 但并不作为对本发明的限定。
图 1为本发明实施例提供的一种无线链路失败指示 （RLF indication) 的处理方法的流程 图， 该方法可以应用于接收到 RLF indication的基站， 例如发生 RLF的基站， 或者 RRC重建 目标基站， 请参照图 1， 该方法包括：
步骤 101 : 接收 RLF indication;
其中， 在 UE发生 RLF后发起 RRC重建被拒后， 拒绝该 RRC连接重建的基站， 在本实 施例中称为 RRC重建目标基站会给发生 RLF的基站发送未携带 RLF report的 RLF indication 而后， 当该 UE选择新的小区进行新的 RRC连接建立并且成功后， UE会在新的 RRC连接建 立过程中携带 RLF report, 该新的 RRC连接建立成功的基站， 在本实施例中称为 RRC建立 目标基站， 会给发生 RLF 的基站或者 RRC 重建目标基站发送携带该 RLF report 的 RLF indication。
其中， 根据不同的异常切换类型， 该 RRC建立目标基站与 RRC重建目标基站或者发生 RLF的基站可能是同一个基站， 也可能不同， 以下将分别通过不同的实施例加以说明。
步骤 102: 根据所述 RLF indication中携带的第一标识确定所述 RLF indication的发送时 机；
在本实施例中， 该 RLF indication的发送时机可以是在 UE进行 RRC重建后发送的， 也 可以是在 UE进行新的 RRC建立后发送的， 根据发送时机的不同， 本实施例会有不同的处理 方法。
在本实施例中， 通过在 RLF indication中携带标识来区别该 RLF indication是在 UE进行 RRC重建后发送的， 还是在 UE进行新的 RRC建立后发送的。 因此， 根据该标识可以确定该 RLF indication的发送时机。
步骤 103: 如果所述 RLF indication 是在 UE进行 RRC重建后发送的， 且所述 RLF indication中不包含无线链路失败报告（RLF report),确定无线链路失败原因为切换参数问题， 将根据所述 RLF indication确定的异常切换类型的统计次数加 1。
在本实施例中， 当 RLF indication是在 UE进行 RRC重建后发送的时，该 RLF indication 中不包含 RLF report, 因此， 本实施例不能根据 RLF report确定无线链路失败原因， 故默认 为切换参数问题， 并将根据 RLF indication确定的异常切换类型的统计次数加 1。
在本实施例中， 异常切换类型可以根据 RLF indication确定， 具体可以通过现有技术的 手段实现， 在此不再赘述。
在本实施例中， 根据异常切换类型的不同， 导致无线链路失败的问题基站可能并非发生
RLF的基站， 因此， 将根据所述 RLF indication确定的异常切换类型的统计次数加 1， 也可以 通过向导致无线链路失败的问题基站发送切换报告的方式， 指示该问题基站将根据所述 RLF indication确定的异常切换类型的统计次数加 1。 在本实施例中， 导致无线链路失败的问题基 站是指由于切换参数设置有问题导致出现异常切换的基站。
其中， 针对不同的异常切换类型， 本发明实施例可以采用不同的方法在源基站调整相应 的统计次数或者通知 RRC重建目标基站调整相应的统计次数。
在一个实施例中， 异常切换类型为切换过晚， 则导致无线链路失败的问题基站为发生 RLF的基站， 故发生 RLF的基站将切换过晚统计次数加 1。
在另外一个实施例中， 异常切换类型为切换过早， 则导致无线链路失败的问题基站为 RRC重建目标基站，则发生 RLF的基站向 RRC重建目标基站发送切换报告，指示该 RRC重 建目标基站将切换过晚统计次数加 1。
在另外一个实施例中， 异常切换类型为切换到错误小区， 则导致无线链路失败的问题基 站为 UE发生 RLF之前的基站， 则发生 RLF的基站向该 UE发生 RLF之前的基站发送切换 报告， 指示该 UE发生 RLF之前的基站将切换到错误小区统计次数加 1。
在本实施例中， 如果后续接收到减计数指示， 则可以根据接收到该减计数指示的时间是 否在本次统计调整周期之内， 来决定对该统计次数的处理。 当接收到所述减计数指示的时间 在本次统计调整周期之内时， 可以将该统计次数减 1 ; 当接收到所述减计数指示的时间不在 本次统计调整周期之内时， 则对确定的异常切换类型的统计次数不处理， 也即将确定的异常 切换类型的统计次数保持不变。
其中， 确定接收到所述减计数指示的时间是否在本次统计调整周期之内， 可以通过将所 述减计数指示中的 UE定时器记录的时间长度， 与本地计算的从接收到所述减计数指示到最 近的前一次统计调整时间之间时间长度进行比较的方法实现。
如果所述 UE定时器记录的时间长度小于所述本地计算的时间长度， 则确认为接收到所 述减计数指示的时间在本统计调整周期之内； 如果所述 UE定时器记录的时间长度大于所述 本地计算的时间长度， 则确认为接收到所述减计数指示的时间不在本统计调整周期之内。
其中， 所述 UE定时器记录的时间长度的起始时间为： UE发生 RLF时或 UE发起 RRC 重建请求时或 UE进入空闲态时或 UE重建被拒时；所述 UE定时器记录的时间长度的结束时 间为： UE接收到 RRC建立成功响应消息时或 UE在 RRC建立成功后发送 RLF report时。
本发明实施例提供的方法， 通过在 RLF indication中携带的标识， 确定 RLF indication的 发送时机， 进而确定无线链路失败原因以及调整异常切换类型对应的统计次数， 可以在满足 能够正确区分无线链路失败原因为统计切换参数问题还是覆盖漏洞问题的前提下， 减少基站 侧过多信息存储以及资源浪费。 图 2为本发明实施例提供的一种无线链路失败指示（RLF indication)的处理方法的流程 图， 该方法也应用于接收到 RLF indication的基站， 请参照图 2， 该方法包括：
步骤 201至步骤 202可以参照图 1所示实施例中的步骤 101至步骤 102，在此不再赘述。 步骤 203: 如果所述 RLF indication是在 UE进行新的 RRC建立后发送的， 且所述 RLF indication中包含 RLF report,根据所述 RLF indication中携带的第二标识确定 UE是否被重建 拒绝过；
在本实施例中， 该 RLF indication是在 UE进行新的 RRC建立后发送的， 而 UE可能在 发生 RLF后被重建拒绝过， 也即 UE发生 RLF后选择到某小区进行 RRC连接重建但被该小 区拒绝， 而后发起该新的 RRC建立； UE也有可能在发生 RLF后没有选择到合适的小区进行 RRC连接重建， 导致进入空闲态， 而后发起该新的 RRC建立。 其中， 如果该 UE曾被重建拒 绝过， 则说明已经存在步骤 103的不包含 RLF report的 RLF indication; 如果该 UE没有被重 建拒绝过， 则说明不存在步骤 103的不包含 RLF report的 RLF indication, 而由于在步骤 103 的处理中已经默认无线链路失败原因为切换参数问题， 因此对于这两种情况， 要分别进行不 同的处理。 因此， 在本实施例中， 可以进一步通过在 RLF indication中或者 RLF report中携带 的第二标识来区别该 UE是否曾被重建拒绝过， 以便进行后续的处理。
在本实施例中， 表明 UE 是否曾被重建拒绝的第二标识可以与步骤 202 中表明 RLF indication发送时机的第一标识为同一标识或不同标识。 当采用同一个标识实现时， 例如通过 一个二进制的数值表示； 当采用不同标识实现时， 例如通过两个标识实现， 本实施例并不以 此作为限制。
步骤 204: 根据所述 RLF report确定无线链路失败原因， 并根据确定的 UE是否曾被重 建拒绝过进行相应的处理；
在本实施例中， 如果确定 UE被重建拒绝过， 则说明之前已经存在如图 1中步骤 103所 示的不包含 RLF report的 RLF indication, 由于之前没有接收到 RLF report, 无法确定无线链 路失败原因而将该原因默认为了切换参数问题，因此，当接收到 RLF report后，要根据该 RLF report确定真正的失败原因。
其中， 由于之前已经根据默认的切换参数问题， 将异常切换类型的统计次数加 1， 因此， 如果此时根据该 RLF report确定所述无线链路失败原因为默认的切换参数问题， 说明之前的 默认是对的， 此时不做处理； 如果此时根据该 RLF report确定所述无线链路失败原因不是默 认的切换参数问题，说明之前的默认是错误的，将根据所述 RLF indication确定的异常切换类 型的统计次数减 1， 也即将错误的统计减掉。
同样的， 由于导致无线链路失败的问题基站可能不是发生 RLF 的基站， 因此， 将根据 所述 RLF indication确定的异常切换类型的统计次数减 1， 也可以通过向导致无线链路失败的 问题基站发送减计数指示的方式，指示该问题基站将根据所述 RLF indication确定的异常切换 类型的统计次数减 1。
在本实施例中， 如果确定 UE未被重建拒绝过， 说明之前不存在如图 1中步骤 103所示 的不包含 RLF report的 RLF indication,也即 UE可能是在 RLF后没有选到合适的小区重建导 致空闲后发起的新的 RRC连接建立， 此时， 可以直接根据该 RLF report确定失败原因， 并根 据失败原因进行相应的处理。
其中， 如果所述无线链路失败原因为切换参数问题， 则将所述 RLF indication对应的异 常切换类型的统计次数加 1 ; 如果所述无线链路失败原因不是切换参数问题， 则不处理。
在本实施例中， 由于 UE发起新的 RRC建立可能是在第一次被重建拒绝后很短的时间， 也可能过了很长时间， 而切换优化算法根据统计次数进行切换参数调整是有一定周期的， 也 艮卩， 接收到该 UE进行新的 RRC建立后发送的 RLF indication的时间可能已经过了优化调整 点， 不在本次统计调整周期之内， 在这种情况下， 由于前一统计调整周期已经做过参数调整， 不需要任何处理。 因此， 本实施例的方法中， 在接收到该 UE进行新的 RRC建立后发送的 RLF indication后，还要确定接收到所述 RLF indication的时间是否在本次统计调整周期之内； 如果接收到所述 RLF indication的时间在本次统计调整周期之内， 则根据所述 RLF indication 中的标识确定 UE是否被重建拒绝过， 并执行步骤 204; 如果接收到所述 RLF indication的时 间不在本次统计调整周期之内， 则不做处理。
其中， 可以通过将所述 RLF report中的 UE定时器记录的时间长度， 与本地计算的从接 收到所述 RLF indication到最近的前一次统计调整时间之间时间长度进行比较的方式，确定接 收到所述 RLF indication的时间是否在本次统计调整周期之内。
如果所述 UE定时器记录的时间长度小于所述本地计算的时间长度， 则确认为接收到所 述 RLF indication的时间在本次统计调整周期之内；如果所述 UE定时器记录的时间长度大于 所述本地计算的时间长度，则确认为接收到所述 RLF indication的时间不在本次统计调整周期 之内。
其中， 所述 UE定时器记录的时间长度的起始时间为： UE发生 RLF时或 UE发起 RRC 重建请求时或 UE进入空闲态时或 UE重建被拒时；所述 UE定时器记录的时间长度的结束时 间为： UE接收到 RRC建立成功响应消息时或 UE在 RRC建立成功后发送 RLF report时。
通过本发明实施例提供的方法，通过在 RLF indication中携带的标识，确定 RLF indication 的发送时机， 进而确定无线链路失败原因以及调整异常切换类型对应的统计次数， 可以在满 足能够正确区分无线链路失败原因为统计切换参数问题还是覆盖漏洞问题的前提下， 减少基 站侧过多信息存储以及资源浪费。
图 3为本发明实施例提供的一种无线链路失败指示 （RLF indication) 的处理方法的流程 图， 该方法对应图 1或图 2所示实施例的方法中， 切换过早或者切换到错误小区的异常切换 类型， 应用于上述异常切换类型中的问题基站， 请参照图 3， 该方法包括：
步骤 301 : 接收发生 RLF的基站在接收到 RLF indication后发送的切换报告； 其中， 当发生 RLF的基站确定该 RLF indication是在 UE进行 RRC重建后发送的，且该 RLF indication中不包含 RLF report时， 由于异常切换类型是切换过早或者切换到错误小区， 也即该发生 RLF的基站并非是导致无线链路失败的问题基站， 则该发生 RLF的基站向导致 无线链路失败的问题基站发送切换报告， 指示该问题基站将相应的切换过早统计次数或者切 换到错误小区统计次数加 1。
步骤 302: 根据所述切换报告将切换报告中指示的异常切换类型的统计次数加 1。
其中， 当本实施例的问题基站接收到切换报告后， 根据该切换报告中的指示， 将相应的 切换过早统计次数或者切换到错误小区统计次数加 1。
在本实施例中，当发生 RLF的基站确定该 RLF indication是在 UE进行新的 RRC建立后 发送的， 且该 RLF indication中包含 RLF report时， 由于异常切换类型是切换过早或者切换到 错误小区， 也即该发生 RLF的基站并非是导致无线链路失败的问题基站， 则当确定需要对相 应的统计次数减 1时， 该发生 RLF的基站向导致无线链路失败的问题基站发送减计数指示， 指示问题基站将相应的切换过早统计次数或者切换过晚统计次数减 1。
在本实施例中， 根据步骤 302将切换报告中指示的异常切换类型的统计次数加 1后， 如 果收到发生 RLF的基站发送的该减计数指示， 则当接收到该减计数指示的时间在本次统计调 整周期之内时， 将相应的统计次数减 1， 当接收到该减计数指示的时间在本次统计调整周期 之内， 则对异常切换类型的统计次数不做任何处理， 也即将确定的异常切换类型的统计次数 保持不变。
其中， 确定接收到所述减计数指示的时间是否在本次统计调整周期之内， 也可以通过将 所述减计数指示中的 UE定时器记录的时间长度， 与本地计算的从接收到所述减计数指示到 最近的前一次统计调整时间之间时间长度进行比较的方法实现。 如果所述 UE定时器记录的 时间长度小于所述本地计算的时间长度， 则确认为接收到所述减计数指示的时间在本次统计 调整周期之内； 如果所述 UE定时器记录的时间长度大于所述本地计算的时间长度， 则确认 为接收到所述减计数指示的时间不在本次统计调整周期之内。
其中， 所述 UE定时器记录的时间长度的起始时间为： UE发生 RLF时或 UE发起 RRC 重建请求时或 UE进入空闲态时或 UE重建被拒时；所述 UE定时器记录的时间长度的结束时 间为： UE接收到 RRC建立成功响应消息时或 UE在 RRC建立成功后发送 RLF report时。 通过本发明实施例提供的方法， 通过根据切换报告以及减计数指示对异常切换类型对应 的统计次数进行调整， 可以在满足能够正确区分无线链路失败原因为统计切换参数问题还是 覆盖漏洞问题的前提下， 减少基站侧过多信息存储以及资源浪费。
为了使图 1-图 3所示实施例的方法更加清楚易懂，以下结合 UE发生 RLF的不同异常切 换类型以及不同场景， 对本实施例的方法进行详细说明。
图 4-图 7为 UE发生 RLF的异常切换类型为切换过晚时， UE与发生 RLF的基站 eNB0、 RRC重建目标基站 eNBl、 RRC建立目标基站 eNB2进行信息交互的流程图。在本实施例中， UE在 eNBO下小区发生无线链路失败， 选择到 eNBl下的某小区进行重建， 重建被拒绝进入 空闲态后， 在 eNB2成功建立新的 RRC连接， 并将 RLF report发送到 eNB2， eNB2获取到 UE的 RLF report后，根据 RLF indication或者 RLF report中携带的标识可以向发生 RLF的基 站 eNBO, 也即参数设置可能有误的问题基站发送 RLF indication (图 4、 图 5)， 也可以向 UE 发起重建的基站 eNBl发送该 RLF indication (图 6、 图 7)。
其中， 图 4为 eNB2向 eNBO发送第二条 RLF indication, eNBO接收到该指示的时间在 其本次统计调整周期之内的流程图； 图 5为 eNB2向 eNBO发送第二条 RLF indication, eNBO 接收到该指示的时间不在其本次统计调整周期之内的流程图。 图 6为 eNB2向 eNBl发送第 二条 RLF indication, eNBO接收到 eNBl发送的减计数指示的时间在其本次统计调整周期之 内的流程图； 图 7为 eNB2向 eNBl发送第二条 RLF indication, eNBO接收到 eNBl发送的减 计数指示的时间不在其本次统计调整周期之内的流程图。
请参照图 4， 该流程包括：
步骤 401 : UE在 eNBO下某小区发生无线链路失败；
步骤 402: UE选择到 eNBl下的某小区进行重建请求；
步骤 403: eNBl拒绝了 UE的重建请求；
步骤 404: eNBl向 eNBO发送第一条不包含 RLF report的 RLF indication;
其中， 该 RLF indication中携带有标识， 表示该 RLF indication是 UE进行 RRC重建后 发送的， 还是 UE发起新的 RRC建立后发送的， 同时， 该 RLF indication中还携带标识， 表 示 UE是否曾经被重建拒绝过。 以上两个标识可以利用同一个标识实现， 也可以利用不同的 标识实现， 本实施例并不以此作为限制。
在本实施例中， 根据该 RLF indication中携带的标识， 确定该 RLF indication是在 UE进 行 RRC重建后发送的。
步骤 405: eNBO默认无线链路失败原因为切换参数的问题，在根据第一条 RLF indication 判断为异常切换类型为切换过晚的情况下， eNBO根据第一条 RLF indication中的标识增加向 对应小区的切换过晚统计次数一次。
其中， 由于 RLF indication是在 UE进行 RRC重建后发送的， 且该 RLF indication中不 包含 RLF report, 所以确定无线链路失败原因为默认的切换参数问题， 将切换过晚统计次数 加 1。
步骤 406: UE发起重建被拒绝后进入空闲态， 随后在 eNB2下的某小区发起新的 RRC 建立请求；
其中， 在该 RRC连接请求中包含了 RLF report或者 RLF report指示。
步骤 407: eNB2根据上述 RRC连接请求获取到 UE的 RLF report后， 根据 RLF report 中的信息向 UE发生 RLF的 eNBO通过 X2或 S1口发送第二条 RLF indication
其中， 该第二条 RLF indication中也携带有标识， 表明该第二条 RLF indication是在 UE 进行 RRC重建后发送的， 还是在 UE发起新的 RRC建立后发送的； 并表明该 UE是否曾经 被重建拒绝过。
步骤 408： eNBO根据接收到的第二条 RLF indication进行相应处理。
在本实施例中，可以将切换过晚统计次数减 1或者，对切换过晚统计次数不做任何处理， 即将确定的异常切换类型的统计次数保持不变。
其中， eNBO接收到该第二条 RLF indication后， 也要根据该第二条 RLF indication中携 带的标识确定该第二条 RLF indication是 UE进行 RRC重建后发送的，还是 UE发起新的 RRC 建立后发送的， 在本实施例中， 确定是在 UE发起新的 RRC建立后发送的。
其中， 由于 UE发起新的 RRC建立可能是在第一次被重建拒绝后很短的时间， 也可能 过很长时间， 而切换优化算法根据统计次数进行切换参数调整是有一定周期的， 也即 eNBO 在收到第二条 RLF indication时可能落在本统计调整周期之内，也可能落在下一个统计调整周 期之内。
为了在 eNBO作正确的统计， 可在 UE侧增加一个定时器， 在 UE的 RRC重建被拒时启 动该定时器， 或者在 UE发生 RLF时启动该定时器， 或者在 UE发起 RRC重建请求时启动该 定时器， 或者在 UE进入空闲态时启动该定时器； 在 UE收到新发起 RRC建立成功响应消息 时停止定时器， 或者在 UE的新的 RRC建立成功后发送 RLF report时停止该定时器。 将该定 时器记录的时间包含在 RLF report中发送给 eNB2， eNB2再向 eNBO发送包含这个 RLF report 的第二条 RLF indication, 假定 eNBO将这个指示消息中定时器记录时间长度为 Tl， eNBO收 到第二条 RLF indication的时间与最近的前一个参数调整时间之间的长度为 T2， 若 Τ1<Τ2， 则确定 eNBO收到第二条 RLF indication时落在本统计调整周期之内；若 T1>T2，则确定 eNBO 收到第二条 RLF indication时落在本统计调整周期之外， 例如下一个统计调整周期之内。 在本实施例中， eNBO在收到第二条 RLF indication的时间在本统计调整周期之内。 eNBO 再进一步根据该第二条 RLF indication中携带的标识确定 UE是否曾经被重建拒绝过，在本实 施例中， 确定 UE曾经被重建拒绝过， 也即之前有过第一条 RLF indication, 则 eNBO根据该 第二条 RLF indication中的信息， 也即 RLF report判断先前的 RLF是由于切换参数问题还是 覆盖漏洞问题， 若的确为切换参数问题说明先前默认统计是正确的， 则无需修改过晚的统计 次数； 而若为覆盖漏洞问题则说明先前默认统计是错误的， 则需从切换过晚统计次数中减去 一次。
请参照图 5， 该流程包括：
步骤 501-507可以参照图 4所示实施例中的步骤 401-407， 此处不再赘述。
步骤 508: eNBO根据接收到的第二条 RLF indication进行相应处理。
在本实施例中， 可以对切换过晚统计次数不做任何处理， 也即将确定的异常切换类型的 统计次数保持不变。
在本实施例中， eNBO根据接收到的该第二条 RLF indication中携带的标识， 确定该第二 条 RLF indication是 UE进行 RRC重建后发送的， 而且 eNBO收到该第二条 RLF indication的 时间不在本统计调整周期之内。由于 eNBO在收到第二条 RLF indication时已经超过了本优化 调整点，落到了下一个统计调整周期之内，而这个指示消息由于是与前一周期内的第一条 RLF indication相关联的， 由于前一周期已做过参数调整， 对于下一个统计周期来说就不应该再对 这条指示信息有任何响应， 即不对这个新统计周期的切换过晚次数作任何修改。
请参照图 6， 该流程包括：
步骤 601-606可以参照图 4所示实施例中步骤 401-406， 在此不再赘述；
步骤 607: eNB2根据上述 RRC连接请求获取到 UE的 RLF report后，根据该 RLF report 中的信息向 UE进行 RRC重建请求的 eNBl通过 X2或 S1口发送第二条 RLF indication
其中， 该第二条 RLF indication中也携带标识， 表明该第二条 RLF indication是在 UE进 行 RRC重建后发送的， 还是在 UE发起新的 RRC建立后发送的； 并表明该 UE是否曾经被 重建拒绝过。
步骤 608: eNBl根据接收到的第二条 RLF indication进行相应处理。
在本实施例中， 可以是对切换过晚统计次数不做任何处理， 即将确定的异常切换类型的 统计次数保持不变， 或者向 eNBO发送减计数指示。
其中， eNBl根据该第二条 RLF indication中携带的标识， 确定该第二条 RLF indication 是在 UE发起新的 RRC建立后发送的， 且该 UE曾经被重建拒绝过， 但由于自己并非是导致 无线链路失败的问题基站， 则 eNBl根据该第二条 RLF indication中的 RLF report判断前次
RLF是由于切换参数问题还是覆盖问题， 若的确为切换参数问题， 则表明先前的默认统计是 正确的， 无需做任何处理； 若为覆盖问题， 则表明先前的默认统计是错误的， eNBl可向导致 无线链路失败的问题基站， 也即 eNBO发送减计数指示信息， 通知 eNBO从切换过晚次数中 减去一次。
步骤 609: eNBO根据接收到的减计数指示进行相应处理。
在本实施例中， 是将切换过晚统计次数减 1。
其中， 根据前面定义的 UE侧定时器记录从 UE发生 RLF时或 UE发起 RRC重建请求 时或 UE进入空闲态时或 UE重建被拒时到 UE接收到 RRC建立成功响应消息时或 UE在 RRC 建立成功后发送 RLF report时的时间长度 Tl， 且需在减计数指示中携带此时间 Tl， eNBO收 到该减计数指示的时间与最近的前一个参数调整时间之间的长度假设为 T3， eNBO收到减计 数指示时， 若判断出 T1< T3， 则确定收到上述减计数指示的时间是在优化调整点之前， 此时 可以根据该减计数指示从过晚切换统计次数中减一； 若 Τ1>Τ3， 则确定收到上述减计数指示 的时间是在优化调整点之后， 表明这个通知对当前优化调整周期无效， 无需响应这个通知消 息不对切换过晚统计次数作任何调整。
在本实施例中， 由于 eNBO接收该减计数指示的时间落入本次统计调整周期之内， 也即 eNBO收到上述减计数指示的时间是在优化调整点之前，则 eNBO可以从过晚切换统计次数中 减一。
请参照图 7， 该流程包括：
步骤 701-708可以参照图 6所示实施例中的步骤 601-607， 在此不再赘述；
步骤 709: eNBO根据接收到的减计数指示进行相应处理。
在本实施例中， 可以对切换过晚统计次数不做任何处理， 也即将确定的异常切换类型的 统计次数保持不变。
在本实施例中， 由于 eNBO接收该减计数指示的时间落入本次统计调整周期之外， 也即 收到上述减计数指示的时间是在优化调整点之后， 则 eNBO不做任何处理， 以确保确定的异 常切换类型的统计次数保持不变。
图 8-图 9为 UE发生 RLF的异常切换类型为切换过晚时， UE与发生 RLF的基站 eNB0、 RRC重建目标基站 eNBl、 RRC建立目标基站 eNB2进行信息交互的流程图。在本实施例中， UE在 eNBO下小区发生无线链路失败， 未选择到合适的小区进行重建， 从而进入空闲状态， 随后 UE在 eNB2下的某小区发起新的 RRC建立请求， eNB2获取到 UE的 RLF report后，根 据其中标识信息通过 X2或 S1口向 eNBO发送 RLF indication 其中， 图 8为 eNB2向 eNBO发送 RLF indication, eNBO接收到该指示的时间在其本次 统计调整周期之内的流程图； 图 9为 eNB2向 eNBO发送 RLF indication, eNBO接收到该指示 的时间不在其本次统计调整周期之内的流程图。
请参照图 8， 该流程包括：
步骤 801 : UE在 eNBO下某小区发生无线链路失败；
步骤 802: UE未选择到合适的小区驻留从而进入空闲状态， 随后 UE在 eNB2下的某小 区发起新的 RRC建立请求；
其中， 该 RRC建立请求中携带有 UE的 RLF report或者 RLF report指示。
步骤 803 : eNB2获取到 UE的 RLF report后， 根据该 RLF report中的信息通过 X2或 S1 口向 eNBO发送 RLF indication;
其中， 该 RLF indication也携带有标识， 表明该 RLF indication是在 UE进行 RRC重建 后发送的， 还是在 UE发起新的 RRC建立后发送的； 并表明该 UE是否曾经被重建拒绝过。
步骤 804: eNBO根据接收到的 RLF indication进行相应处理。
在本实施例中，可以将切换过晚统计次数加 1或者，对切换过晚统计次数不做任何处理， 即将确定的异常切换类型的统计次数保持不变。
其中， 根据该 RLF indication中携带的标识， eNBO确定该 RLF indication是在 UE发起 新的 RRC建立后发送的。
其中， UE发起新的 RRC建立可能是在进入空闲态后很短的时间， 但也可能过了很长时 间， 而切换优化算法根据统计次数进行切换参数调整是有一定周期的， 也即 eNBO收到 RLF indication时可能落在本统计调整周期之内， 也可能落在本统计周期之外。
其中， 为了在 eNBO作正确的统计， 需记录 UE进入空闲态到 UE收到新发起 RRC建立 成功的响应消息之间的时间长度， 实际上可以利用 UE定时器， 启动时间为 UE进入空闲态 时， 停止时间为 UE收到新发起 RRC建立成功响应消息时 UE在 RRC建立成功后发送 RLF report 时， 假定 eNBO 将 RLF indication 中定时器记录时间长度为 Tl， eNBO 收到该 RLF indication的时间与最近的前一个参数调整时间之间的长度为 T2，若 Τ1<Τ2，则确定收到 RLF indication时落在本统计调整周期之内； 若 T1>T2， 则确定收到 RLF indication时可能落在本 统计调整周期之外。
在本实施例中， eNBO收到 RLF indication时落在本统计调整周期之内， eNBO再进一步 根据该 RLF indication中携带的标识确定 UE是否曾经被重建拒绝过， 在本实施例中， 确定 UE不曾被重建拒绝过， 也即之前没有第一条 RLF indication, 贝 lj eNBO根据该 RLF indication 中的信息， 也即 RLF report判断先前的 RLF是由于切换参数问题还是覆盖漏洞问题， 若为切 换参数问题则对切换过晚的次数加一； 而若为覆盖漏洞问题则不对统计次数作任何调整。 请参照图 9， 该流程包括：
步骤 901-903可以参照图 8所示实施例中步骤 801-803， 在此不再赘述。
步骤 904: eNBO根据接收到的 RLF indication进行相应处理。
在本实施例中， 可以对切换过晚统计次数不做任何处理， 也即将确定的异常切换类型的 统计次数保持不变。
在本实施例中， eNBO在收到 RLF indication时已经超过了本优化调整点而落到了下一个 统计调整周期之内， 而这个指示消息由于是前一周期内发生的 RLF事件相关联的， 而由于前 一周期已做过参数调整， 对于下一个统计周期来说就不应该再对这条指示信息有任何响应， 即不对这个新统计周期的过晚次数作任何修改。
图 10-图 13为 UE发生 RLF的异常切换类型为切换过早时， UE与发生 RLF的基站 eNB0、 RRC重建目标基站 eNBl、 RRC建立目标基站 eNB2进行信息交互的流程图。在本实施例中， UE成功从 eNBl下某小区切换到 eNBO下某小区，在该小区短时间停留后即发生 RLF并向源 小区所属基站 eNBl发起重建请求， 根据切换过晚的判断准则， eNBl会先向 eNBO发送一条 RLF indication, eNBO根据该 UE最近的成功切换到发生 RLF时间长度判断为切换过早， 即 向 eNBl发送 Handover report以便 eNBl侧增加切换过早统计次数一次。
其中， UE在 eNBO下小区发生无线链路失败， 选择到 eNBl下的某小区进行重建， 重建 被拒绝进入空闲态后， 可能在 eNB2成功建立新的 RRC连接， eNB2获取到 UE的 RLF report 后可以根据其中标识向发生 RLF的基站 eNBO, 也即参数设置可能有误的问题基站发送 RLF indication (图 10、 图 11 )， 也可以向 UE发起重建的基站 eNBl发送这个 RLF indication (图 12、 图 13)。
其中，图 10为 eNB2向 eNBO发送第二条 RLF indication, eNBO确定无线链路失败原因， eNBl接收到 eNBO发送的减计数指示的时间在其本次统计调整周期之内的流程图； 图 11为 eNB2向 eNBO发送第二条 RLF indication, eNBO确定无线失败原因， eNBl接收到 eNBO发 送的减计数指示的时间不在其本次统计调整周期之内的流程图； 图 12为 eNB2向 eNBl发送 第二条 RLF indication, eNBl接收到该指示的时间在其本次统计调整周期之内的流程图； 图 13为 eNB2向 eNBl发送第二条 RLF indication, eNBO接收到该指示的时间不在其本次统计 调整周期之内的流程图。
请参照图 10， 该流程包括：
步骤 1001 : UE成功从 eNBl切换到 eNBO;
步骤 1002: UE在 eNBO短暂停留后发生无线链路失败； 步骤 1003: UE选择到 eNBl下的某小区进行重建请求；
步骤 1004: eNBl拒绝了 UE的重建请求；
步骤 1005: eNBl向 eNBO发送第一条不包含 RLF report的 RLF indication;
其中， 该第一条 RLF indication中携带标识， 表示该第一条 RLF indication是 UE进行 RRC重建后发送的， 还是 UE发起新的 RRC建立后发送的， 同时， 该第一条 RLF indication 中还携带标识， 表示 UE是否曾经被重建拒绝过。 以上两个标识可以利用同一个标识实现， 也可以利用不同的标识实现， 本实施例并不以此作为限制。
在本实施例中， 根据该 RLF indication中携带的标识， 确定该 RLF indication是在 UE进 行 RRC重建后发送的， 则不需要再判断 UE是否曾经被重建拒绝过。
步骤 1006: eNBO根据前次切换成功到发生 RLF的时间长度判断为过早切换， 默认是由 于切换参数问题导致的切换过早， 从而 eNBO向 eNBl发送 Handover report, 指示 eNBl增加 切换过早一次；
其中， 由于该 RLF indication是在 UE进行 RRC重建后发送的， 且该 RLF indication中 没有 RLF report,因此，在本实施例中默认是由于切换参数问题导致的切换过早，又由于 eNBO 并非导致无线链路失败的问题基站， 则该 eNBO 向导致无线链路失败的问题基站 eNBl发送 Handover report, 指示该 eNBl将切换过早统计次数增加一次。
步骤 1007: eNBl将切换过早统计次数增加一次；
其中， eNBl根据 Handover report中的指示将切换过早统计次数增加一次。
步骤 1008: UE在 eNB2发起新的 RRC建立；
其中， 在该 RRC连接请求中包含了 RLF report或者 RLF report指示。
步骤 1009: eNB2向 eNBO通过 X2或 S1发送带有 RLF report的第二条 RLF indication 其中， 该第二条 RLF indication也携带有标识， 表明该第二条 RLF indication是在 UE进 行 RRC重建后发送的， 还是在 UE发起新的 RRC建立后发送的； 并表明该 UE是否曾经被 重建拒绝过。
步骤 1010: eNBO根据接收到的第二条 RLF indication进行相应处理。
在本实施例中，可以向 eNBl发送减计数指示或者，对切换过早统计次数不做任何处理， 即将确定的异常切换类型的统计次数保持不变。
其中， 根据该第二条 RLF indication中携带的标识， eNBO确定该第二条 RLF indication 是在 UE发起新的 RRC建立后发送的。
其中， 由于 eNBO并不是导致无线链路失败的问题基站， 因此， eNBO不需要确定其收 到该第二条 RLF indication 的时间是否在本次统计调整周期之内， 而是进一步根据该 RLF indication中携带的标识确定 UE是否曾经被重建拒绝过， 在本实施例中， 确定 UE曾被重建 拒绝过， 也即之前有过第一条 RLF indication, 则 eNBO根据第二条 RLF indication中的 RLF report判断前次 RLF是由于切换参数问题还是覆盖问题， 若的确为切换参数问题， 则表明先 前的默认统计是正确的， 无需做任何处理； 若为覆盖问题， 则表明先前的默认统计是错误的， 由于 eNBO并不是导致无线链路失败的问题基站， 故 eNBO可向导致无线链路失败的问题基 站 eNBl发送指示信息， 通知 eNBl从切换过早统计次数中减去一次。
步骤 1011 : eNBl根据接收到的减计数指示进行相应处理， 在本实施例中， 是将切换过 早统计次数减 1。
其中， 与切换过晚中类似， 请参考图 6、 图 7， 要考虑 eNBl收到减计数指示是在优化 调整点之前还是之后。 根据前面定义的 UE侧定时器记录的时间长度 Tl， 且需在减计数指示 中携带此时间 Tl， eNBl收到减计数指示的时间与最近的前一个参数调整时间之间的长度假 设为 T3， eNBl收到减计数指示时， 若判断出 T1< T3， 则确定收到减计数指示是在优化调整 点之前， 可以根据该减计数指示从统计的过早次数中减一； 若判断出 Τ1>Τ3， 则确定收到减 计数指示是在优化调整点之后， 即表明这个指示对当前优化调整周期无效， 无需响应这个通 知消息不对统计次数作任何调整。
在本实施例中， eNBl收到减计数指示的时间在其本统计调整周期之内。 eNBl根据该减 计数指示， 将统计的过早切换次数减去一次。
请参照图 11， 该流程包括：
步骤 1101-1110可以参照图 10所示实施例中步骤 1001-1010， 在此不再赘述； 步骤 1111 : eNBl根据接收到的减计数指示进行相应处理。
在本实施例中， 可以对切换过早统计次数不做任何处理， 也即将确定的异常切换类型的 统计次数保持不变。
在本实施例中， 由于 eNBl接收该减计数指示的时间落入本次统计调整周期之外， 也即 收到上述减计数指示的时间是在优化调整点之后， 则 eNBl不做任何处理， 以确保确定的异 常切换类型的统计次数保持不变。
请参照图 12， 该流程包括：
步骤 1201-1208可以参考图 10实施例中的步骤 1001-1008， 在此不再赘述；
步骤 1209: eNB2向 eNBl通过 X2或 S1发送带有 RLF report的第二条 RLF indication; 其中， 该第二条 RLF indication也携带有标识， 表明该第二条 RLF indication是在 UE进 行 RRC重建后发送的， 还是在 UE发起新的 RRC建立后发送的； 并表明该 UE是否曾经被 重建拒绝过。 步骤 1210: eNBl根据接收到的第二条 RLF indication进行相应处理。
在本实施例中，可以将切换过早统计次数减 1或者，对切换过早统计次数不做任何处理， 即将确定的异常切换类型的统计次数保持不变。
其中， 根据该第二条 RLF indication中携带的标识， eNBl确定该第二条 RLF indication 是在 UE发起新的 RRC建立后发送的。
其中， eNBl要考虑收到第二条 RLF indication的时间是在优化调整点之前还是之后。 根 据前面定义的 UE侧定时器记录的时间长度 Tl， eNBl收到第二条 RLF indication的时间与最 近的前一个参数调整时间之间的长度为 T2， 当 eNBl 收到带有 RLF report 的第二条 RLF indication时， 若判断出 Tl< Τ2， 则确定收到第二条 RLF indication的时间是在优化调整点之 前； 若判断出 T1>T2， 则确定收到第二条 RLF indication的时间是在优化调整点之后， 表明这 个通知对当前优化调整周期无效， 无需响应这个通知消息不对统计次数作任何调整。
在本实施例中， 收到第二条 RLF indication的时间是在优化调整点之前， 则 eNBl再进 一步根据该第二条 RLF indication中携带的标识确定 UE是否曾经被重建拒绝过，在本实施例 中， 确定 UE曾被重建拒绝过， 也即之前有过第一条 RLF indication, 而该 eNBl为此次切换 过早的问题基站， 贝 lj eNBl根据该第二条 RLF indication中的 RLF report判断前次 RLF是由 于切换参数问题还是覆盖问题， 若的确为切换参数问题， 则表明先前的默认统计是正确的无 需做任何处理； 若为覆盖问题， 则表明先前的默认统计是错误的， eNBl从切换过早次数中减 去一次。
请参照图 13， 该流程包括：
步骤 1301-1309可以参考图 12所示实施例中步骤 1201-1209， 在此不再赘述； 步骤 1310: eNBl根据接收到的第二条 RLF indication进行相应处理。
在本实施例中， 可以对切换过早统计次数不做任何处理， 也即将确定的异常切换类型的 统计次数保持不变。
在本实施例中， 收到第二条 RLF indication的时间是在优化调整点之后， 则表明这个通 知对当前优化调整周期无效， 无需响应这个通知消息， eNBl不对统计次数作任何调整。
图 14一 15为切换过早的另外一个应用场景， 即 UE从 eNBO切换到 eNBl的过程中发生 切换失败， 然后 UE重建到 eNBO被拒， 而后 UE向 eNB2发起新的 RRC建立。 其中， 图 14 为 eNB2向 eNBO发送 RLF indication, eNBO收到该 RLF indication的时间在本次统计调整周 期之内的示意图； 图 15为 eNB2向 eNBO发送 RLF indication, eNBO收到该 RLF indication 的时间不在本次统计调整周期之内的示意图。
请参照图 14， 该流程包括： 步骤 1401 : UE从 eNBO切换到 eNBl过程中发生切换失败；
步骤 1402: UE选择到 eNBO下的某小区进行重建请求；
步骤 1403: eNBO拒绝了 UE的重建请求；
其中， 由于 eNBO是此次切换过程中的问题基站， 而 UE又重建到该问题基站， 因此， eNBO在默认切换参数问题导致的切换过早的情况下， 将切换过早统计次数加 1。
步骤 1404: UE在 eNB2发起新的 RRC建立；
其中， 在该 RRC连接请求中包含了 RLF report或者 RLF report指示。
步骤 1405: eNB2向 eNBO通过 X2或 S1发送带有 RLF report的 RLF indication 其中， 该第二条 RLF indication携带有标识， 表明该 RLF indication是在 UE进行 RRC 重建后发送的， 还是在 UE发起新的 RRC建立后发送的； 并表明该 UE是否曾经被重建拒绝 过。
步骤 1406: eNBO根据接收到的第二条 RLF indication进行相应处理。
在本实施例中，可以将切换过早统计次数减 1或者，对切换过早统计次数不做任何处理， 也即将确定的异常切换类型的统计次数保持不变。
其中， 根据该 RLF indication中携带的标识， eNBO确定该 RLF indication是在 UE发起 新的 RRC建立后发送的。
其中， eNBO要考虑收到 RLF indication的时间是在优化调整点之前还是之后。 根据前 面定义的 UE侧定时器记录的时间长度 Tl， eNBO收到 RLF indication的时间与最近的前一个 参数调整时间之间的长度为 T2， 当 eNBO收到带有 RLF report的 RLF indication时， 若判断 出 T1< T2， 则确定收到 RLF indication的时间是在优化调整点之前； 若判断出 T1>T2， 则确 定收到 RLF indication的时间是在优化调整点之后， 表明这个通知对当前优化调整周期无效， 无需响应这个通知消息不对统计次数作任何调整。
在本实施例中， 收到 RLF indication的时间是在优化调整点之前， 则 eNBO再进一步根 据该 RLF indication中携带的标识确定 UE是否曾经被重建拒绝过， 在本实施例中， 确定 UE 曾被重建拒绝过， 尽管之前没有过第一条 RLF indication, 但由于重建基站与问题基站是同一 个， 也即 eNBO, 所以该问题基站已经作了默认的无线链路失败原因的处理， 则 eNBO根据该 RLF indication中的 RLF report判断前次 RLF是由于切换参数问题还是覆盖问题，若的确为切 换参数问题， 则表明先前的默认统计是正确的无需做任何处理； 若为覆盖问题， 则表明先前 的默认统计是错误的， eNBO从切换过早次数中减去一次。
请参照图 15， 该流程包括：
步骤 1501-1505可以参考图 14所示实施例中步骤 1401-1405， 在此不再赘述； 步骤 1506: eNBO根据接收到的第二条 RLF indication进行相应处理。
在本实施例中， 可以对切换过早统计次数不做任何处理， 也即将确定的异常切换类型的 统计次数保持不变。
在本实施例中， 收到 RLF indication的时间是在优化调整点之后， 则表明这个通知对当 前优化调整周期无效， 无需响应这个通知消息， eNBO不对统计次数作任何调整。
在图 14和图 15所示实施例中， 与图 6和图 7所示实施例类似， eNB2也可以将 RLF indication发送到 eNBl， eNBl 根据该 RLF indication 中的标识确定是不做任何处理还是向 eNBO发送减计数指示，使得问题基站 eNBO根据收到该减计数指示送时间是否在其本次统计 调整周期之内， 决定将切换过早统计次数加 1， 还是不做任何处理。 该实施例与图 6、 图 7实 施例的处理过程类似， 在此不再赘述。
图 16-图 17为 UE发生 RLF的异常切换类型为切换到错误小区时， UE与发生 RLF的基 站 eNB0、 问题基站 eNBl、 RRC重建目标基站 eNB2、 以及 RRC建立目标基站 eNB3进行信 息交互的流程图。 在本实施例中， UE成功从 eNBl下某小区切换到 eNBO下某小区， 在该小 区发生短暂停留后发生 RLF， 然后向 eNB2发起重建请求， 依据切换过晚的判断原则， 首先 eNB2向 eNBO发送 RLF indication, eNBO侧根据前次切换成功到发生 RLF的时间长度及小 区标识判断为切换到错误小区，则 eNBO向 eNBl发送 handover report以使问题小区所属基站 eNBl统计切换到错误小区一次。 若 UE重建被拒后向 eNB3发起新的 RRC建立， eNB3根据 RLF report中的标识信息可能向 UE发生 RLF的 eNBO发送第二条 RLF indication (图 16、 图 17)； 也可能向 UE发起重建的 eNB2发送第二条 RLF indication; 或者向问题基站， 即， 应进 行参数调整优化的基站 eNBl发送第二条 RLF indication
其中， 图 16为 eNB3向 eNBO发送第二条 RLF indication, eNBl接收到 eNBO发送的减 计数指示的时间在其本次统计调整周期之内的流程图；图 17为 eNB3向 eNBO发送第二条 RLF indication, eNBl接收到 eNBO发送的减计数指示的时间不在其本次统计调整周期之内的流程 图。
请参照图 16， 该流程包括：
步骤 1601 : UE成功从 eNBl切换到 eNBO;
步骤 1602: UE在 eNBO短暂停留后发生 RLF;
步骤 1603: UE选择到 eNB2下的某小区进行重建请求；
步骤 1604: eNB2拒绝了 UE的重建请求；
步骤 1605: eNB2向 eNBO发送第一条不包含 RLF report的 RLF indication;
其中， 该 RLF indication中携带标识， 表示该 RLF indication是 UE进行 RRC重建后发 送的， 还是 UE发起新的 RRC建立后发送的， 同时， 该 RLF indication中还携带标识， 表示 UE是否曾经被重建拒绝过。 以上两个标识可以利用同一个标识实现， 也可以利用不同的标识 实现， 本实施例并不以此作为限制。
在本实施例中， 根据该 RLF indication中携带的标识， 确定该 RLF indication是在 UE进 行 RRC重建后发送的， 则不需要再判断 UE是否曾经被重建拒绝过。
步骤 1606: eNBO侧根据前次切换成功到发生 RLF的时间长度判断为切换到错误小区， 则 eNBO向 eNBl发送 handover report以使问题小区所属基站 eNBl统计切换到错误小区一次； 其中， 由于该 RLF indication是在 UE进行 RRC重建后发送的， 且该 RLF indication中 没有 RLF report,因此，在本实施例中默认是由于切换参数问题导致的切换过早，又由于 eNBO 并非问题基站， 则该 eNBO向问题基站 eNBl发送 Handover report, 指示该 eNBl将切换过早 统计次数增加一次。
步骤 1607 : eNBl增加切换到错误小区统计次数一次；
其中， eNBl根据 Handover report中的指示将切换过早统计次数增加一次。
步骤 1608 : UE在 eNB3发起新的 RRC建立；
其中， 在该 RRC连接请求中包含了 RLF report或者 RLF report指示。
步骤 1609: eNB3向 eNBO通过 X2或 S1发送带有 RLF report的第二条 RLF indication 其中， 该第二条 RLF indication也携带有标识， 表明该第二条 RLF indication是在 UE进 行 RRC重建后发送的， 还是在 UE发起新的 RRC建立后发送的； 并表明该 UE是否曾经被 重建拒绝过。
步骤 1610: eNBO根据接收到的第二条 RLF indication进行相应处理。
在本实施例中， 可以向 eNBl发送减计数指示或者， 对切换到错误小区统计次数不做任 何处理， 即将确定的异常切换类型的统计次数保持不变。
其中， 该步骤与步骤 1010类似， 在此不再赘述。
步骤 1611 : eNBl根据接收到的减计数指示进行相应处理， 在本实施例中， 是将切换到 错误小区统计次数减 1。
其中， 该步骤与步骤 1011类似， 在此不再赘述。
请参照图 17， 该流程包括：
步骤 1701-1710可以参考图 16所示实施例中步骤 1601-1610， 在此不再赘述； 步骤 1711 : eNBl根据接收到的减计数指示进行相应处理。
在本实施例中， 可以对切换到错误小区统计次数不做任何处理， 也即将确定的异常切换 类型的统计次数保持不变。 该步骤与步骤 1111类似， 在此不再赘述。
在图 16和图 17所示实施例中， 与图 6和图 7所示实施例类似， eNB3也可以将 RLF indication发送到 eNB2， eNB2根据该 RLF indication 中的标识确定是不做任何处理还是向 eNBl发送减计数指示，使得问题基站 eNBl根据收到该减计数指示时间是否在其本次统计调 整周期之内， 决定将切换到错误小区统计次数加 1， 还是不做任何处理。 该实施例与图 6、 图 7实施例的处理过程类似， 在此不再赘述。
在图 16和图 17所示实施例中， 与图 12和图 13所示实施例类似， eNB3也可以将 RLF indication发送到问题基站 eNBl , eNBl根据接收到该 RLF indication的时间是否在其本次统 计调整周期之内决定如何处理， 例如， 如果 eNBl收到该 RLF indication的时间在其本次统计 调整周期之内，则根据 RLF indication中的 RLF report确定无线链路失败原因是否为默认的切 换参数问题， 如果是则不做任何处理， 如果不是， 则将切换到错误小区统计次数减 1 ; 如果 eNBl收到该 RLF indication的时间不在其本次统计调整周期之内， 则不做任何处理。 该实施 例与图 12、 图 13实施例的处理过程类似， 在此不再赘述。
图 18—图 19为切换到错误小区的另一个应用场景，即 UE从 eNBO切换到 eNBl过程中 发生切换失败， 然后， UE重建到 eNB2被拒， 而后 UE向 eNB3发起新的 RRC建立。 其中， 图 18为 eNB3向 eNBO发送第二条 RLF indication, eNBO收到该第二条 RLF indication的时 间在本次统计调整周期之内的示意图；图 19为 eNB3向 eNBO发送第二条 RLF indication, eNBO 收到该第二条 RLF indication的时间不在本次统计调整周期之内的示意图。
请参照图 18， 该流程包括：
步骤 1801 : UE从 eNBO切换到 eNBl过程中发生切换失败；
步骤 1802: UE选择到 eNB2下的某小区进行重建请求；
步骤 1803: eNB2拒绝了 UE的重建请求；
步骤 1804: eNB2向 eNBO发送第一条不包含 RLF report的 RLF indication;
其中， 该 RLF indication中携带标识， 表示该 RLF indication是 UE进行 RRC重建后发 送的， 还是 UE发起新的 RRC建立后发送的， 同时， 该 RLF indication中还携带标识， 表示 UE是否曾经被重建拒绝过。 以上两个标识可以利用同一个标识实现， 也可以利用不同的标识 实现， 本实施例并不以此作为限制。
在本实施例中， 根据该 RLF indication中携带的标识， 确定该 RLF indication是在 UE进 行 RRC重建后发送的， 则不需要再判断 UE是否曾经被重建拒绝过。
步骤 1805: eNBO默认无线链路失败原因为切换参数的问题，在根据第一条 RLF indication 判断为异常切换类型为切换到错误小区的情况下， eNBO根据第一条 RLF indication中的标识 增加切换到错误小区的统计次数一次。
其中， 由于 RLF indication是在 UE进行 RRC重建后发送的， 且该 RLF indication中不 包含 RLF report, 所以确定无线链路失败原因为默认的切换参数问题， 将切换到错误小区统 计次数加 1。
步骤 1806: eNBO在 eNB3发起新的 RRC建立；
其中， 在该 RRC连接请求中包含了 RLF report或者 RLF report指示。
步骤 1807: eNB3向 eNBO通过 X2或 S1发送带有 RLF report的 RLF indication 其中， 该第二条 RLF indication携带有标识， 表明该 RLF indication是在 UE进行 RRC 重建后发送的， 还是在 UE发起新的 RRC建立后发送的； 并表明该 UE是否曾经被重建拒绝 过。
步骤 1808: eNBO根据接收到的第二条 RLF indication进行相应处理。
在本实施例中， 可以将切换过早统计次数减 1或者， 对切换到错误小区统计次数不做任 何处理， 即将确定的异常切换类型的统计次数保持不变。
其中，根据该第二条 RLF indication中携带的标识， eNBO确定该 RLF indication是在 UE 发起新的 RRC建立后发送的。
其中， eNBO要考虑收到 RLF indication的时间是在优化调整点之前还是之后。 根据前 面定义的 UE侧定时器记录的时间长度 Tl， eNBO收到 RLF indication的时间与最近的前一个 参数调整时间之间的长度为 T2， 当 eNBO收到带有 RLF report的 RLF indication时， 若判断 出 Tl< Τ2， 则确定收到 RLF indication的时间是在优化调整点之前； 若判断出 T1>T2， 则确 定收到 RLF indication的时间是在优化调整点之后， 表明这个通知对当前优化调整周期无效， 无需响应这个通知消息不对统计次数作任何调整。
在本实施例中， 收到 RLF indication的时间是在优化调整点之前， 则 eNBO再进一步根 据该第二条 RLF indication中携带的标识确定 UE是否曾经被重建拒绝过， 在本实施例中， 确 定 UE曾被重建拒绝过， 也即之前有过第一条 RLF indication, 贝 lj eNBO根据该 RLF indication 中的 RLF report判断前次 RLF是由于切换参数问题还是覆盖问题， 若的确为切换参数问题， 则表明先前的默认统计是正确的无需做任何处理； 若为覆盖问题， 则表明先前的默认统计是 错误的， eNBO从切换到错误小区统计次数中减去一次。
请参照图 19， 该流程包括：
步骤 1901-1907: 与步骤 1801-1807相同， 在此不再赘述；
步骤 1908: eNBO根据接收到的第二条 RLF indication进行相应处理。
在本实施例中， 可以对切换到错误小区统计次数不做任何处理， 也即将确定的异常切换 类型的统计次数保持不变。
在本实施例中， eNBO收到第二条 RLF indication的时间是在优化调整点之后， 则表明这 个通知对当前优化调整周期无效， 无需响应这个通知消息， eNBO不对统计次数作任何调整。
在图 18和图 19所示实施例中， 与图 6和图 7所示实施例类似， eNB3也可以将第二条 RLF indication发送到 eNBl或 eNB2， eNBl或 eNB2根据该第二条 RLF indication中的标识 确定是不做任何处理还是向 eNBO发送减计数指示， 使得问题基站 eNBO根据收到该减计数 指示时间是否在其本次统计调整周期之内， 决定将切换到错误小区统计次数加 1， 还是不做 任何处理。 该实施例与图 6、 图 7实施例的处理过程类似， 在此不再赘述。
在图 18和图 19所示实施例中， 与图 12和图 13所示实施例类似， eNB3也可以将第二 条 RLF indication发送到问题基站 eNBO, eNBO根据接收到该第二条 RLF indication的时间是 否在其本次统计调整周期之内决定如何处理， 例如， 如果 eNBO收到该第二条 RLF indication 的时间在其本次统计调整周期之内，则根据第二条 RLF indication中的 RLF report确定无线链 路失败原因是否为默认的切换参数问题， 如果是则不做任何处理， 如果不是， 则将切换到错 误小区统计次数减 1 ; 如果 eNBO收到该第二条 RLF indication的时间不在其本次统计调整周 期之内， 则不做任何处理。 该实施例与图 12、 图 13实施例的处理过程类似， 在此不再赘述。
通过本发明实施例提供的方法， 可以在满足能够正确区分统计切换参数问题和覆盖漏洞 问题的前提下， 减少基站侧过多信息存储以及等待时间。
图 20为本发明实施例提供的一种无线链路失败指示 （RLF indication) 的处理装置的组 成框图， 该装置可以包含于基站， 请参照图 20， 该装置包括：
第一接收单元 2001， 用于接收 RLF indication;
第一确定单元 2002， 用于根据所述 RLF indication 中携带的第一标识确定所述 RLF indication的发送时机；
第一处理单元 2003， 用于在所述 RLF indication是在 UE进行 RRC重建后发送的， 且所 述 RLF indication中不包含 RLF report时，确定无线链路失败原因为切换参数问题，将根据所 述 RLF indication确定的异常切换类型的统计次数加 1。
在一个实施例中， 第一处理单元 2003具体用于： 直接将根据所述 RLF indication确定的 异常切换类型的统计次数加 1 ; 或者向导致无线链路失败的问题基站发送切换报告， 指示所 述问题基站将根据所述 RLF indication确定的异常切换类型的统计次数加 1。
在一个实施方式中， 该装置还可以包括：
第二确定单元 2004， 用于在所述 RLF indication是在 UE进行新的 RRC建立后发送的， 且所述 RLF indication中包含 RLF report时， 根据所述 RLF indication中携带的第二标识确定 UE是否被重建拒绝过。
第二处理单元 2005， 用于在所述第二确定单元确定 UE被重建拒绝过时， 根据所述 RLF report确定无线链路失败原因，如果所述无线链路失败原因为切换参数问题，将确定的异常切 换类型的统计次数保持不变;如果所述无线链路失败原因不是切换参数问题，将根据所述 RLF indication确定的异常切换类型的统计次数减 1。
其中， 所述第一标识和第二标识为同一标识或不同标识。
在一个实施例中， 第二处理单元 2005具体用于在所述无线链路失败原因不是切换参数 问题时， 向将确定的异常切换类型的统计次数保持不变问题基站发送减计数指示， 指示所述 问题基站将根据所述 RLF indication确定的异常切换类型的统计次数减 1。
第三处理单元 2006， 用于在所述第二确定单元确定 UE未被重建拒绝过时， 根据所述
RLF report确定无线链路失败原因，如果所述无线链路失败原因为切换参数问题，将所述 RLF indication对应的异常切换类型的统计次数加 1 ; 如果所述无线链路失败原因不是切换参数问 题， 将确定的异常切换类型的统计次数保持不变。
在一个实施例中， 该装置还可以包括：
第三确定单元 2007， 用于确定接收到所述 RLF indication的时间是否在本次统计调整周 期之内，如果接收到所述 RLF indication的时间在本次统计调整周期之内时，通过所述第二确 定单元根据所述 RLF indication中携带的第二标识确定 UE是否被重建拒绝过；如果接收到所 述 RLF indication的时间不在本次统计调整周期之内时，将确定的异常切换类型的统计次数保 持不变。
在本实施例中， 第三确定单元 2007可以包括：
第一比较模块 20071， 用于将所述 RLF report中的 UE定时器记录的时间长度， 与本地 计算的从接收到所述 RLF indication到最近的前一次统计调整时间之间时间长度进行比较； 第一确定模块 20072， 用于在所述第一比较模块的比较结果为所述 UE定时器记录的时 间长度小于所述本地计算的时间长度时，确定接收到所述 RLF indication的时间在本次统计调 整周期之内； 用于在所述比较模块的比较结果为所述 UE定时器记录的时间长度大于所述本 地计算的时间长度时， 确定接收到所述 RLF indication的时间不在本次统计调整周期之内； 其中， 所述 UE定时器记录的时间长度的起始时间为： UE发生 RLF时或 UE发起 RRC 重建请求时或 UE进入空闲态时或 UE重建被拒时；所述 UE定时器记录的时间长度的结束时 间为： UE接收到 RRC建立成功响应消息时或 UE在 RRC建立成功后发送 RLF report时。
在一个实施方式中， 该装置还可以包括：
第二接收单元 2008， 用于在所述第一处理单元将根据所述 RLF indication确定的异常切 换类型的统计次数加 1后， 接收 RRC重建目标基站发送的减计数指示；
第四确定单元 2009，用于确定所述第二接收单元接收到所述减计数指示的时间是否在本 次统计调整周期之内；
第四处理单元 2010，用于在所述第四确定单元确定所述第二接收单元接收到所述减计数 指示的时间在本次统计调整周期之内时， 将所述统计次数减 1 ; 在所述第四确定单元确定所 述第二接收单元接收到所述减计数指示的时间不在本次统计调整周期之内， 将确定的异常切 换类型的统计次数保持不变。
在本实施例中， 第四处理单元 2010可以包括：
第二比较模块 20101， 将所述减计数指示中的 UE定时器记录的时间长度， 与本地计算 的从接收到所述减计数指示到最近的前一次统计调整时间之间时间长度进行比较；
第二确定模块 20102， 用于在所述第二比较模块的比较结果为所述 UE定时器记录的时 间长度小于所述本地计算的时间长度时， 确定所述第二接收单元接收到所述减计数指示的时 间在本次统计调整周期之内； 在所述第二比较模块的比较结果为所述 UE定时器记录的时间 长度大于所述本地计算的时间长度时， 确定所述第二接收单元接收到所述减计数指示的时间 不在本次统计调整周期之内；
其中， 所述 UE定时器记录的时间长度的起始时间为： UE发生 RLF时或 UE发起 RRC 重建请求时或 UE进入空闲态时或 UE重建被拒时；所述 UE定时器记录的时间长度的结束时 间为： UE接收到 RRC建立成功响应消息时或 UE在 RRC建立成功后发送 RLF report时。
本发明实施例的装置的各组成部分分别用于实现前述图 1、 图 2所示实施例的方法的各 步骤， 由于在图 1、 图 2所示实施例中， 已经对各步骤进行了详细说明， 在此不再赘述。
通过本发明实施例提供的装置， 可以在满足能够正确区分统计切换参数问题和覆盖漏洞 问题的前提下， 减少基站侧过多信息存储以及等待时间。
图 21为本发明实施例提供的一种无线链路失败指示 （RLF indication) 的处理装置的组 成框图， 请参照图 21， 该装置包括：
第一接收单元 211， 用于接收发生 RLF的基站在接收到 RLF indication后发送的切换报 告. 第一处理单元 212， 用于根据所述第一接收单元接收到的切换报告， 将切换报告中指示 的异常切换类型的统计次数加 1。
在一个实施例中， 该装置还可以包括：
第二接收单元 213，用于在所述第一处理单元根据所述第一接收单元接收到的切换报告， 将切换报告中指示的异常切换类型的统计次数加 1之后， 接收发生 RLF的基站发送的减计数 指示；
确定单元 214， 用于确定所述第二接收单元接收到所述减计数指示的时间是否在本次统 计调整周期之内；
第二处理单元 215， 用于在所述确定单元确定所述第二接收单元接收到所述减计数指示 的时间在本次统计调整周期之内时， 将所述统计次数减 1 ; 在所述确定单元确定所述第二接 收单元接收到所述减计数指示的时间在本次统计调整周期之内时， 将确定的异常切换类型的 统计次数保持不变。
在一个实施例中， 确定单元 214可以包括：
比较模块 2141，用于将所述第二接收单元接收到的减计数指示中的 UE定时器记录的时 间长度， 与本地计算的从接收到所述减计数指示到最近的前一次统计调整时间之间时间长度 进行比较；
确定模块 2142，用于在所述比较模块的比较结果为所述 UE定时器记录的时间长度小于 所述本地计算的时间长度时， 确定所述第二接收单元接收到所述减计数指示的时间在本次统 计调整周期之内； 在所述比较模块的比较结果为所述 UE定时器记录的时间长度大于所述本 地计算的时间长度时， 确定所述第二接收单元接收到所述减计数指示的时间不在本次统计调 整周期之内；
其中， 所述 UE定时器记录的时间长度的起始时间为： UE发生 RLF时或 UE发起 RRC 重建请求时或 UE进入空闲态时或 UE重建被拒时；所述 UE定时器记录的时间长度的结束时 间为： UE接收到 RRC建立成功响应消息时或 UE在 RRC建立成功后发送 RLF report时。
本实施例的装置的各组成部分分别用于实现前述图 3所示实施例的方法的各步骤， 由于 在图 3所示的实施例中， 已经对各步骤进行了详细说明， 在此不再赘述。
通过本发明实施例提供的装置， 可以在满足能够正确区分统计切换参数问题和覆盖漏洞 问题的前提下， 减少基站侧过多信息存储以及等待时间。
结合本文中所公开的实施例描述的方法或算法的步骤可以直接用硬件、 处理器执行的软 件模块， 或者二者的结合来实施。 软件模块可以置于随机存储器 （RAM)、 内存、 只读存储 器（ROM)、 电可编程 ROM、 电可擦除可编程 ROM、寄存器、硬盘、可移动磁盘、 CD-ROM、 或技术领域内所公知的任意其它形式的存储介质中。
以上所述的具体实施例， 对本发明的目的、技术方案和有益效果进行了进一步详细说明， 所应理解的是， 以上所述仅为本发明的具体实施例而已， 并不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， 所做的任何修改、 等同替换、 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、 一种无线链路失败指示的处理方法， 其特征在于， 所述方法包括：
接收无线链路失败指示；
根据所述无线链路失败指示中携带的第一标识确定所述无线链路失败指示的发送时机； 如果所述无线链路失败指示是在终端 UE进行无线资源控制 RRC重建后发送的， 且所 述无线链路失败指示中不包含无线链路失败报告， 确定无线链路失败原因为切换参数问题， 将根据所述无线链路失败指示确定的异常切换类型的统计次数加 1。
2、 根据权利要求 1所述的方法， 其特征在于， 所述将根据所述无线链路失败指示确定 的异常切换类型的统计次数加 1， 包括：
直接将根据所述无线链路失败指示确定的异常切换类型的统计次数加 1 ; 或者 向导致无线链路失败的问题基站发送切换报告， 指示所述问题基站将根据所述无线链路 失败指示确定的异常切换类型的统计次数加 1。
3、 根据权利要求 1所述的方法， 其特征在于， 如果所述无线链路失败指示是在 UE进 行新的 RRC建立后发送的， 且所述无线链路失败指示中包含无线链路失败报告， 则所述方法 还包括：
根据所述无线链路失败指示中携带的第二标识确定 UE是否被重建拒绝过；
如果确定 UE被重建拒绝过， 根据所述无线链路失败报告确定无线链路失败原因； 如果所述无线链路失败原因为切换参数问题，将确定的异常切换类型的统计次数保持不变; 如果所述无线链路失败原因不是切换参数问题， 将根据所述无线链路失败指示确定的异 常切换类型的统计次数减 1 ;
其中， 所述第一标识和第二标识为同一标识或不同标识。
4、 根据权利要求 3所述的方法， 其特征在于， 如果确定 UE未被重建拒绝过， 根据所 述无线链路失败报告确定无线链路失败原因；
如果所述无线链路失败原因为切换参数问题， 将所述无线链路失败指示对应的异常切换 类型的统计次数加 1 ;
如果所述无线链路失败原因不是切换参数问题， 将确定的异常切换类型的统计次数保持 不变。
5、 根据权利要求 3所述的方法， 其特征在于， 根据所述无线链路失败指示中携带的第 二标识确定 UE是否被重建拒绝过之前， 所述方法还包括： 确定接收到所述无线链路失败指示的时间是否在本次统计调整周期之内； 如果接收到所述无线链路失败指示的时间在本次统计调整周期之内， 根据所述无线链路 失败指示中携带的第二标识确定 UE是否被重建拒绝过；
如果接收到所述无线链路失败指示的时间不在本次统计调整周期之内， 将确定的异常切 换类型的统计次数保持不变。
6、 根据权利要求 5所述的方法， 其特征在于， 确定接收到所述无线链路失败指示的时 间是否在本次统计调整周期之内， 具体包括：
将所述无线链路失败报告中的 UE定时器记录的时间长度， 与本地计算的从接收到所述 无线链路失败指示到最近的前一次统计调整时间之间时间长度进行比较；
如果所述 UE定时器记录的时间长度小于所述本地计算的时间长度， 确认为接收到所述 无线链路失败指示的时间在本次统计调整周期之内；
如果所述 UE定时器记录的时间长度大于所述本地计算的时间长度， 确认为接收到所述 无线链路失败指示的时间不在本次统计调整周期之内；
其中， 所述 UE定时器记录的时间长度的起始时间为： UE发生无线链路失败 RLF时或 UE发起 RRC重建请求时或 UE进入空闲态时或 UE重建被拒时；所述 UE定时器记录的时间 长度的结束时间为： UE接收到 RRC建立成功响应消息时或 UE在 RRC建立成功后发送无线 链路失败报告时。
7、 根据权利要求 3所述的方法， 其特征在于， 所述将根据所述无线链路失败指示确定 的异常切换类型的统计次数减 1， 包括：
向导致无线链路失败的问题基站发送减计数指示， 指示所述问题基站将根据所述无线链 路失败指示确定的异常切换类型的统计次数减 1。
8、 根据权利要求 1所述的方法， 其特征在于， 所述将根据所述无线链路失败指示确定 的异常切换类型的统计次数加 1之后， 所述方法还包括：
如果接收到 RRC重建目标基站发送的减计数指示， 确定收到所述减计数指示的时间是 否在本次统计调整周期之内；
如果收到所述减计数指示的时间在本次统计调整周期之内， 将所述统计次数减 1 ; 如果收到所述减计数指示的时间不在本次统计调整周期之内， 将确定的异常切换类型的 统计次数保持不变。
9、 根据权利要求 8所述的方法， 其特征在于， 确定收到所述减计数指示的时间是否在 本次统计调整周期之内， 包括：
将所述减计数指示中的 UE定时器记录的时间长度， 与本地计算的从接收到所述减计数 指示到最近的前一次统计调整时间之间时间长度进行比较；
如果所述 UE定时器记录的时间长度小于所述本地计算的时间长度， 确认为接收到所述 减计数指示的时间在本次统计调整周期之内；
如果所述 UE定时器记录的时间长度大于所述本地计算的时间长度， 确认为接收到所述 减计数指示的时间不在本次统计调整周期之内；
其中， 所述 UE定时器记录的时间长度的起始时间为： UE发生 RLF时或 UE发起 RRC 重建请求时或 UE进入空闲态时或 UE重建被拒时；所述 UE定时器记录的时间长度的结束时 间为： UE接收到 RRC建立成功响应消息时或 UE在 RRC建立成功后发送无线链路失败报告时。
10、 一种无线链路失败指示的处理装置， 其特征在于， 所述装置包括：
第一接收单元， 用于接收无线链路失败指示；
第一确定单元， 用于根据所述无线链路失败指示中携带的第一标识确定所述无线链路失 败指示的发送时机；
第一处理单元， 用于在所述无线链路失败指示是在 UE进行 RRC重建后发送的， 且所 述无线链路失败指示中不包含无线链路失败报告时，确定无线链路失败原因为切换参数问题， 将根据所述无线链路失败指示确定的异常切换类型的统计次数加 1。
11、 根据权利要求 10所述的装置， 其特征在于， 所述第一处理单元具体用于： 直接将 根据所述无线链路失败指示确定的异常切换类型的统计次数加 1 ; 或者向导致无线链路失败 的问题基站发送切换报告， 指示所述问题基站将根据所述无线链路失败指示确定的异常切换 类型的统计次数加 1。
12、 根据权利要求 10所述的装置， 其特征在于， 所述装置还包括：
第二确定单元， 用于在所述无线链路失败指示是在 UE进行新的 RRC建立后发送的， 且所述无线链路失败指示中包含无线链路失败报告时， 根据所述无线链路失败指示中携带的 第二标识确定 UE是否被重建拒绝过；
第二处理单元， 用于在所述第二确定单元确定 UE被重建拒绝过时， 根据所述无线链路 失败报告确定无线链路失败原因， 如果所述无线链路失败原因为切换参数问题， 将确定的异 常切换类型的统计次数保持不变； 如果所述无线链路失败原因不是切换参数问题， 将根据所 述无线链路失败指示确定的异常切换类型的统计次数减 1 ;
其中， 所述第一标识和第二标识为同一标识或不同标识。
13、 根据权利要求 12所述的装置， 其特征在于， 所述装置还包括：
第三处理单元， 用于在所述第二确定单元确定 UE未被重建拒绝过时， 根据所述无线链 路失败报告确定无线链路失败原因， 如果所述无线链路失败原因为切换参数问题， 将所述无 线链路失败指示对应的异常切换类型的统计次数加 1 ; 如果所述无线链路失败原因不是切换 参数问题， 将确定的异常切换类型的统计次数保持不变。
14、 根据权利要求 12所述的装置， 其特征在于， 所述装置还包括：
第三确定单元， 用于确定接收到所述无线链路失败指示的时间是否在本次统计调整周期 之内， 如果接收到所述无线链路失败指示的时间在本次统计调整周期之内时， 通过所述第二 确定单元根据所述无线链路失败指示中携带的第二标识确定 UE是否被重建拒绝过； 如果接 收到所述无线链路失败指示的时间不在本次统计调整周期之内时， 将确定的异常切换类型的 统计次数保持不变。
15、 根据权利要求 14所述的装置， 其特征在于， 所述第三确定单元包括：
第一比较模块， 用于将所述无线链路失败报告中的 UE定时器记录的时间长度， 与本地 计算的从接收到所述无线链路失败指示到最近的前一次统计调整时间之间时间长度进行比较； 第一确定模块， 用于在所述第一比较模块的比较结果为所述 UE定时器记录的时间长度 小于所述本地计算的时间长度时， 确定接收到所述无线链路失败指示的时间在本次统计调整 周期之内； 用于在所述比较模块的比较结果为所述 UE定时器记录的时间长度大于所述本地 计算的时间长度时， 确定接收到所述无线链路失败指示的时间不在本次统计调整周期之内； 其中， 所述 UE定时器记录的时间长度的起始时间为： UE发生 RLF时或 UE发起 RRC 重建请求时或 UE进入空闲态时或 UE重建被拒时；所述 UE定时器记录的时间长度的结束时 间为： UE接收到 RRC建立成功响应消息时或 UE在 RRC建立成功后发送无线链路失败报告时。
16、 根据权利要求 12所述的装置， 其特征在于， 所述第二处理单元具体用于在所述无 线链路失败原因不是切换参数问题时， 向导致无线链路失败的问题基站发送减计数指示， 指 示所述问题基站将根据所述无线链路失败指示确定的异常切换类型的统计次数减 1。
17、 根据权利要求 10所述的装置， 其特征在于， 所述装置还包括：
第二接收单元， 用于在所述第一处理单元将根据所述无线链路失败指示确定的异常切换 类型的统计次数加 1后， 接收 RRC重建目标基站发送的减计数指示；
第四确定单元， 用于确定所述第二接收单元接收到所述减计数指示的时间是否在本次统 计调整周期之内；
第四处理单元， 用于在所述第四确定单元确定所述第二接收单元接收到所述减计数指示 的时间在本次统计调整周期之内时， 将所述统计次数减 1 ; 在所述第四确定单元确定所述第 二接收单元接收到所述减计数指示的时间不在本次统计调整周期之内时， 将确定的异常切换 类型的统计次数保持不变。
18、 根据权利要求 17所述的装置， 其特征在于， 所述第四确定单元包括： 第二比较模块， 将所述减计数指示中的 UE定时器记录的时间长度， 与本地计算的从接 收到所述减计数指示到最近的前一次统计调整时间之间时间长度进行比较；
第二确定模块， 用于在所述第二比较模块的比较结果为所述 UE定时器记录的时间长度 小于所述本地计算的时间长度时， 确定所述第二接收单元接收到所述减计数指示的时间在本 次统计调整周期之内； 在所述第二比较模块的比较结果为所述 UE定时器记录的时间长度大 于所述本地计算的时间长度时， 确定所述第二接收单元接收到所述减计数指示的时间不在本 次统计调整周期之内；
其中， 所述 UE定时器记录的时间长度的起始时间为： UE发生 RLF时或 UE发起 RRC 重建请求时或 UE进入空闲态时或 UE重建被拒时；所述 UE定时器记录的时间长度的结束时 间为： UE接收到 RRC建立成功响应消息时或 UE在 RRC建立成功后发送无线链路失败报告时。
19、 一种无线链路失败指示的处理方法， 其特征在于， 所述方法包括：
接收发生 RLF的基站在接收到无线链路失败指示后发送的切换报告；
根据所述切换报告将切换报告中指示的异常切换类型的统计次数加 1。
20、 根据权利要求 19所述的方法， 其特征在于， 根据所述切换报告将切换报告中指示 的异常切换类型的统计次数加 1之后， 所述方法还包括：
接收发生 RLF的基站发送的减计数指示；
确定接收到所述减计数指示的时间是否在本次统计调整周期之内；
如果接收到所述减计数指示的时间在本次统计调整周期之内， 将所述统计次数减 1 ; 如果接收到所述减计数指示的时间在本次统计调整周期之内， 将确定的异常切换类型的 统计次数保持不变。
21、 根据权利要求 20所述的方法， 其特征在于， 确定接收到所述减计数指示的时间是 否在本次统计调整周期之内， 包括：
将所述减计数指示中的 UE定时器记录的时间长度， 与本地计算的从接收到所述减计数 指示到最近的前一次统计调整时间之间时间长度进行比较；
如果所述 UE定时器记录的时间长度小于所述本地计算的时间长度， 则确认为接收到所 述减计数指示的时间在本次统计调整周期之内；
如果所述 UE定时器记录的时间长度大于所述本地计算的时间长度， 则确认为接收到所 述减计数指示的时间不在本次统计调整周期之内；
其中， 所述 UE定时器记录的时间长度的起始时间为： UE发生 RLF时或 UE发起 RRC 重建请求时或 UE进入空闲态时或 UE重建被拒时；所述 UE定时器记录的时间长度的结束时 间为： UE接收到 RRC建立成功响应消息时或 UE在 RRC建立成功后发送无线链路失败报告时。
22、 一种无线链路失败指示的处理装置， 其特征在于， 所述装置包括：
第一接收单元， 用于接收发生 RLF的基站在接收到无线链路失败指示后发送的切换报告； 第一处理单元， 用于根据所述第一接收单元接收到的切换报告， 将切换报告中指示的异 常切换类型的统计次数加 1。
23、 根据权利要求 22所述的装置， 其特征在于， 所述装置还包括：
第二接收单元， 用于在所述处理单元根据所述第一接收单元接收到的切换报告， 将切换 报告中指示的异常切换类型的统计次数加 1之后， 接收发生 RLF的基站发送的减计数指示； 确定单元， 用于确定所述第二接收单元接收到所述减计数指示的时间是否在本次统计调 整周期之内；
第二处理单元， 用于在所述确定单元确定所述第二接收单元接收到所述减计数指示的时 间在本次统计调整周期之内时， 将所述统计次数减 1 ; 在所述确定单元确定所述第二接收单 元接收到所述减计数指示的时间在本次统计调整周期之内时， 将确定的异常切换类型的统计 次数保持不变。
24、 根据权利要求 23所述的装置， 其特征在于， 所述确定单元包括：
比较模块， 用于将所述第二接收单元接收到的减计数指示中的 UE定时器记录的时间长 度， 与本地计算的从接收到所述减计数指示到最近的前一次统计调整时间之间时间长度进行 比较；
确定模块， 用于在所述比较模块的比较结果为所述 UE定时器记录的时间长度小于所述 本地计算的时间长度时， 确定所述第二接收单元接收到所述减计数指示的时间在本次统计调 整周期之内； 在所述比较模块的比较结果为所述 UE定时器记录的时间长度大于所述本地计 算的时间长度时， 确定所述第二接收单元接收到所述减计数指示的时间不在本次统计调整周 期之内；
其中， 所述 UE定时器记录的时间长度的起始时间为： UE发生 RLF时或 UE发起 RRC 重建请求时或 UE进入空闲态时或 UE重建被拒时；所述 UE定时器记录的时间长度的结束时 间为： UE接收到 RRC建立成功响应消息时或 UE在 RRC建立成功后发送无线链路失败报告时。
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