WO2013117066A1

WO2013117066A1 - Method and device for detecting user equipment abnormity in long term evolution system

Info

Publication number: WO2013117066A1
Application number: PCT/CN2012/077210
Authority: WO
Inventors: 王转莉; 赵刚
Original assignee: 中兴通讯股份有限公司
Priority date: 2012-02-09
Filing date: 2012-06-20
Publication date: 2013-08-15
Also published as: CN102547832A

Abstract

Disclosed are a method and device for detecting UE abnormity in a long term evolution system, the method comprising: within a preset detection time, a CMAC detects that NACKs or DTXs consecutively received by the UE exceed a preset abnormity threshold; and the CMAC determines that the UE is abnormal. The present invention can detect and confirm that a UE release is triggered by abnormal UE unplugging, and does not reckon the release into the call dropping rate, thus optimizing the call dropping rate, and ensuring the rationality of measuring the device system performance according to the call dropping rate.

Description

The present invention relates to the field of communications, and in particular to a method and apparatus for detecting an abnormality of a user equipment (User Equipment, UE for short) in a long term evolution system. BACKGROUND The dropped call rate indicator is an important indicator for measuring system performance in a mobile communication network. For the fourth generation technology of mobile network evolution, Long Time Evolution (LTE) technology, call drop rate indicators are the most important. The call drop rate indicator is defined as: Call drop rate = number of abnormal releases / number of successful establishments. The number of abnormal releases refers to the release of the UE due to system equipment. For example, the failure of the radio link triggers the UE to release, the S1 link fault triggers the UE release, the cell reset triggers the UE release, and so on. In the LTE system, the supported service types are mainly data services, and the voice services are provided by Voice over Internet Protocol (VoIP) services. This type of service breaks through the characteristics of traditional service access and release operations. . The 3G tradition is based on voice services and is connected to the process of releasing with Attach and Detach. In LTE, the release of data services, most people are accustomed to the direct removal of the data card, the result is that there is no normal detach process, the UE is not online, on the eNodeb side and the mobility management entity (Mobility Management Entity , referred to as the MME side, the instance of the UE is still saved. In the case that there is no downlink service, LTE detects that the user has no service and initiates UE release through the User Inactive mechanism. This situation is not counted as dropped calls at present; in the case of downlink services, the use of the UM mode is not perceptible. When the AM mode is used, the downlink data is retransmitted due to the feedback of the UE, until the maximum number of retransmissions is reached, causing the radio link to fail, triggering the eNodeb side to initiate UE release. This radio link failure release will be counted. Dropping words causes the drop rate to rise linearly, which is unreasonable for measuring the performance of the equipment system. SUMMARY OF THE INVENTION The present invention provides a method and apparatus for detecting anomalies in a UE in a long term evolution system, to at least solve the related art. In the LTE system, when the UE is abnormally unplugged, the UE is triggered to be released, and the UE cannot be released due to the failure of the radio link. Distinguish, thus affecting the problem of call rate calculation. According to an aspect of the present invention, a method for detecting an abnormality of a UE in a long term evolution system is provided, including: a Media Access Control (CMAC) that detects a continuous UE in a preset detection time. The received non-acknowledgment character (Non-Acknowledgement, abbreviated as NACK) or discontinuous transmission (DTX) exceeds a preset abnormal threshold; CMAC determines that the UE is abnormal. Preferably, after the CMAC determines the UE abnormality, the method further includes: sending, by the CMAC, a UE abnormality indication message to a radio network layer controller (Radio Network Layer Controller, RNLC for short), where

The UE abnormality indication message is used to instruct the RNLC to perform UE abnormality confirmation detection. Preferably, after the CMAC sends the UE abnormality indication message to the RNLC, the method further includes: the RNLC receives the UE abnormality indication message from the CMAC; the RNLC performs radio resource control (Radio Resource Control, RRC for short) reconfiguration; the RNLC Determining that the RRC reconfiguration time exceeds a preset time; the RNLC initiates a UE release procedure. Preferably, after the RNLC performs RRC reconfiguration on the UE, the method further includes: the RNLC receives the reconfiguration complete message from the UE; and the RNLC stops the current UE abnormal acknowledgement detection. Preferably, after the RNLC receives the reconfiguration complete message from the UE, the method further includes: the RNLC sending a first UE normal indication message to the CMAC, where the first UE normal indication message is used to indicate that the CMAC stops the current UE abnormality detection. . Preferably, after the RNLC receives the UE abnormality indication message from the CMAC, the method further includes: the RNLC receiving the second UE normal indication message from the CMAC, where the second UE normal indication message is used to indicate that the RNLC stops the UE abnormal acknowledgement Detection; The RNLC stops the current UE anomaly acknowledgment detection. Preferably, after the RNLC initiates the UE release procedure, the method further includes: the counter calculating the number of releases of the UE; and the counter calculating the dropped call rate according to the number of releases. Preferably, the preset detection time is less than the Polling duration of the Radio Link Control (RLC) multiplied by the maximum number of retransmissions. According to another aspect of the present invention, a device for detecting an abnormality of a UE in a long term evolution system is applied to a CMAC, including: a detecting module, configured to detect a NACK or DTX continuously received by a UE within a preset detection time. Exceeding the preset abnormal threshold; determining module, set to determine UE abnormality. Preferably, the foregoing apparatus further includes: a sending module, configured to send a UE abnormality indication message to the RNLC, where the UE abnormality indication message is used to instruct the RNLC to perform the UE abnormal acknowledgement detection. In the present invention, the UE abnormality detection is performed by the CMAC, and if the NACK or DTX continuously received by the UE exceeds a preset abnormal threshold value within a predetermined detection time, the UE is considered to be abnormal. Therefore, the present invention can detect that the UE release is triggered by the UE being abnormally unplugged, and the release does not count into the dropped call rate, which ensures that the performance of the device system is reasonable according to the dropped call rate. BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, which are set to illustrate,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,, In the drawings: FIG. 1 is a flowchart of a method for detecting a UE anomaly in a long term evolution system according to an embodiment of the present invention; FIG. 2 is a flowchart of UE anomaly detection of a CMAC according to a preferred embodiment of the present invention; FIG. 4 is a block diagram showing a structure of a UE abnormality detecting apparatus in a long term evolution system according to an embodiment of the present invention; FIG. 5 is a long-term evolution according to a preferred embodiment of the present invention. A specific structural block diagram of a detecting device for a UE abnormality in the system; FIG. 6 is a schematic structural diagram of a UE abnormality detecting and reporting system in a long term evolution system according to a preferred embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS It should be noted that the embodiments in the present application and the features in the embodiments may be combined with each other without conflict. The invention will be described in detail below with reference to the drawings in conjunction with the embodiments. The embodiment of the present invention provides a method for detecting an abnormality of a UE in a long term evolution system. FIG. 1 is a flowchart of a method for detecting an abnormality of a UE in a long term evolution system according to an embodiment of the present invention. As shown in FIG. 1, the method includes the following steps. S102 to step S104. Step S102: The CMAC detects that the NACK or DTX continuously received by the UE exceeds a preset abnormal threshold value within a preset detection time. Step S104, the CMAC determines that the UE is abnormal. In the related art, when the UE is abnormally unplugged in the LTE system, the UE is triggered to be released, and cannot be distinguished from the UE release caused by the failure of the radio link, thereby affecting the calculation of the dropped call rate. In the embodiment of the present invention, the UE abnormality detection is performed by the CMAC, and if the NACK or DTX continuously received by the UE exceeds a preset abnormal threshold value within a preset detection time, the UE is considered to be abnormal. Therefore, the present invention can detect that the UE release is triggered by the UE being abnormally unplugged, and the release does not count into the dropped call rate, thereby ensuring the rationality of the device system performance according to the dropped call rate, and effectively optimizing the LTE system. The RRC call drop rate indicator and the Enhanced Radio Access Bearer (E-RAB) call drop rate indicator. The UE abnormality detection procedure of the CMAC is triggered by the MCS=0 of the UE. Since the UE is not online, the MCS is gradually lowered to 0. The CMAC performs the UE abnormality detection, and reports the detection result to the RNLC, and then proceeds to the next round of detection. If the next round of detection finds that the NACK or DTX continuously received by the UE is lower than the abnormal threshold, the UE normal indication message is reported to the RNLC. The embodiment of the present invention further provides a preferred implementation manner, that is, after the CMAC performs the UE abnormality detection process, the detection result is sent to the RNLC, and the RNLC is prompted to perform related operations. If the detection result is abnormal, the RNLC performs UE abnormality confirmation detection; if the detection result is normal, the RNLC stops the current UE abnormality confirmation detection process. Therefore, after the CMAC determines the UE abnormality, the method further includes: the CMAC sends a UE abnormality indication message to the RNLC, where the UE abnormality indication message is used to instruct the RNLC to perform the UE abnormal acknowledgement detection.

The RNLC performs the UE abnormal acknowledgment detection as follows: The RNLC receives the UE abnormality indication message from the CMAC; the RNLC performs RRC reconfiguration on the UE; the RNLC determines that the RRC reconfiguration time exceeds a preset time; and the RNLC initiates the UE release procedure. The UE abnormal acknowledgment detection process of the RNLC provided by the preferred embodiment indicates that the UE performs RRC reconfiguration. If the UE reconfiguration is unsuccessful, the UE is considered to be offline (unplugged abnormally), thereby triggering the UE release process, and the release is not Taking into account the dropped call rate, the accuracy of the test results is further ensured, and the call drop rate indicator is optimized. The foregoing embodiment describes that the RRC reconfiguration of the UE is unsuccessful. If the RRC reconfiguration succeeds, after the RNLC performs RRC reconfiguration on the UE, the method further includes: the RNLC receives the reconfiguration complete message from the UE; UE abnormality confirmation detection. The RNLC receives the reconfiguration complete message from the UE, and the UE reconfiguration is completed, indicating that the UE is normal. Therefore, in addition to the RNLC stopping the UE abnormality detection, the CMAC also needs to stop the current UE abnormality detection and perform the next detection. The specific steps are as follows: After the RNLC receives the reconfiguration complete message from the UE, the RNLC sends a first UE normal indication message to the CMAC, where the first UE normal indication message is used to instruct the CMAC to stop the current UE abnormality detection. This avoids unnecessary detection and saves system resources. In addition, after the CMAC reports the UE abnormality indication message to the RNLC, the RNLC performs UE abnormality confirmation detection. Therefore, during the abnormal acknowledgment detection process of the RNLC, the CMAC has performed the next detection, and the detection result may be that the UE is normal, and the detection result is reported to the RNLC, and the RNLC does not need to continue the current UE abnormality confirmation detection. Therefore, after the RNLC receives the UE abnormality indication message from the CMAC, the method further includes: the RNLC receives the second UE normal indication message from the CMAC, where the second UE normal indication message is used to indicate that the RNLC stops the UE abnormal acknowledgement detection; The RNLC stops the UE abnormal acknowledgement detection. In the preferred embodiment, the UE abnormality confirmation detection of the current RNLC is stopped in time, and system resources can be saved. The above is the UE abnormality confirmation detection procedure of the RNLC, that is, the RNLC receives the UE abnormality indication message of the CMAC, and organizes a reconfiguration message to the UE by using the existing parameters of the UE. If the reconfiguration complete message of the UE can be successfully received, the UE is considered to be normal and no processing is performed. If the reconfiguration completion timer expires, the UE is considered to be offline, and the UE release procedure is triggered. At the same time, the performance module is reported to the counter 1: the UE is abnormally unplugged to cause the E-RAB to be released; the counter 2 is reported: the UE is abnormally unplugged and the UE context is released. This UE release does not count towards the dropped call rate. The UE abnormality detection method provided by the embodiment of the present invention is to make the calculation of the dropped call rate more reasonable. After the RNLC initiates the UE release process, the method further includes: the counter calculates the number of releases of the UE; and the counter calculates the dropped call according to the number of releases. rate. It has been confirmed here that the UE release is caused by the abnormal removal of the UE. When the counter calculates the dropped call rate, the above-mentioned confirmed UE release does not count into the dropped call rate, which ensures that the performance of the device system is reasonable according to the dropped call rate. It should be noted that the performance module of the eNodeB defines two counters, respectively counting that the UE is abnormally unplugged, causing the release of the E-RAB and the UE being abnormally unplugged, resulting in release of the UE context. It should be noted that when the RNLC is in the UE abnormality detection, when the RNLC receives the ERROR IND indication that exceeds the maximum number of retransmissions, no processing is performed. Wait until the UE is detected to be normal, then proceed with the ERROR IND processing flow. It should be noted that the above-mentioned preset detection time is smaller than the polling duration of the RLC multiplied by the maximum number of retransmissions. The CMAC UE fault detection message can only be reported once before the fault is rectified. That is, if the fault has been reported, the fault will be detected in the next round and it is not necessary to report it. The implementation process of the embodiment of the present invention will be described in detail below with reference to examples. The present invention provides a method for detecting anomalies in a UE in a long term evolution system. First, the CMAC performs detection to detect that the UE is abnormally removed. Then, the RNLC further confirms the detection according to the detection result of the CMAC, and confirms that the UE is abnormal, and initiates UE release. At the same time, the UE is reported to be abnormally unplugged to the performance module. When the performance module calculates the call drop rate, the counter that the UE is abnormally unplugged is not counted. The detection method of the present invention will be described below with reference to FIG. 2 (UE anomaly detection of CMAC) and FIG. 3 (UE anomaly detection of RNLC). 2 is a flowchart of UE anomaly detection of CMAC according to a preferred embodiment of the present invention. As shown in FIG. 2, the following steps S202 to S218 are included. In step S202, the CMAC detects that MCS=0. Here, the UE is abnormally unplugged and causes it to be offline. The MCS will gradually decrease to 0. Step S204, the CMAC starts UE abnormality detection. Step S206, the CMAC accumulates the DTX or NACK fed back by the UE, where NACK is taken as an example. In step S208, the CMAC determines whether the detection time is up. If the result of the determination is yes, step S210 is performed; if the result of the determination is no, step S206 is performed to continue to determine whether the detection duration is reached. Step S210, the CMAC determines whether the accumulated NACK exceeds a preset abnormal threshold. If the threshold is exceeded, step S212 is performed; if the threshold is not exceeded, step S216 is performed. Step S212: The CMAC determines whether the current detection has reported the UE abnormality to the RNLC. If the result of the determination is yes, step S218 is performed; if the result of the determination is no, step S214 is performed. Step S214: The CMAC reports the UE abnormality to the RNLC, and then the RNLC performs further confirmation detection. Step S216: The CMAC reports to the RNLC that the UE is normal. In step S218, the CMAC performs the next round of detection. FIG. 3 is a flowchart of UE abnormality confirmation detection of an RNLC according to a preferred embodiment of the present invention. As shown in FIG. 3, the following steps S302 to S322 are included. Step S302: The RNLC receives the UE abnormality indication reported by the CMAC, and starts the UE abnormality detection. Step S304, the RNLC sends an RRC reconfiguration message to the UE, and determines whether the UE can complete the reconfiguration according to whether the UE can complete the reconfiguration.

Whether the UE is normal. Step S306, the RNLC determines that the reconfiguration complete timer expires, indicating that the UE is offline. Step S308, the RNLC initiates a UE release procedure, where the UE release is caused by the UE being abnormally unplugged. Step S310, the RNLC reports the counter to the performance module. On the other hand, if the UE reconfiguration is completed, that is, the UE is normal, the specific operation is as follows: Step S312: The RNLC receives the UE reconfiguration complete message. Step S314, the RNLC sends a UE normal indication message to the CMAC. Step S316, the CMAC receives the UE normal indication message. Step S318, the CMAC stops the current UE abnormality detection. In the process of the UE abnormality detection of the RNLC, the CMAC may have completed the next round of detection, and the detection result is normal. The specific operation is as follows: Step S320: The RNLC receives the UE normal indication message of the CMAC. Step S322, the RNLC stops the current UE abnormality confirmation detection. In order to better understand the present invention, the detection method of the present invention will be further described below by way of specific examples. Take the case of optimizing the RRC call drop rate under the cell object as an example. The detection duration is set to 1S and the abnormal threshold is set to 100 times. From UE1 to UE5, there are 5 users who succeeded at 11:11 to 11:15 on a certain day. The specific implementation steps are as follows:

(1) On the Data Radio Bearer (DRB) of the AM mode of the UE1, a downlink packet filling service is initiated. After the UE1 downlink service is filled for 15 minutes, the terminal of UE1 is manually unplugged.

(2) Since the UE is not online, the MCS will gradually decrease to 0, and the CMAC starts to start UE anomaly detection. All TB blocks are NACK due to the lack of Hybrid Automatic Repeat Request (HQQ) response within the detection duration. The detected NACK is 1000 times, and the abnormal threshold is exceeded (100 times), and the UE is reported to the control plane RNLC.

(3) Control plane The RNLC receives the UE abnormality indication and sends an RRC reconfiguration message to the UE. Since the UE is offline, the reconfiguration completion timer expires and the UE is confirmed to be abnormal. Initiate the UE release process.

(4) The RNLC reports to the performance module that the UE is offline and causes the counter to be released. (5) The release of the UE collected by the performance module is not performed online. (6) The RRC call drop rate calculated by this granularity is 0/5=0%. It should be noted that the steps shown in the flowchart of the accompanying drawings may be performed in a computer system such as a set of computer executable instructions, and, although the logical order is shown in the flowchart, in some cases, The steps shown or described may be performed in an order different than that herein. The embodiment of the present invention provides a device for detecting an abnormality of a UE in a long term evolution system, which is applied to a CMAC. The apparatus for detecting an abnormality of a UE in the long term evolution system may be used to implement a method for detecting an abnormality of a UE in the foregoing long term evolution system. FIG. 4 is a structural block diagram of a device for detecting an abnormality of a UE in a long term evolution system according to an embodiment of the present invention. As shown in FIG. 4, the detection module 42 and the determining module 44 are included. The structure is described in detail below. The detecting module 42 is configured to detect that the NACK or DTX continuously received by the UE exceeds a preset abnormal threshold in a preset detection time; the determining module 44 is connected to the detecting module 42 and configured to be configured according to the detecting module 42 The detection result determines that the UE is abnormal. The device embodiment of the present invention further provides a preferred implementation manner. In order to ensure the accuracy of the detection result, the detection result needs to be sent to the RNLC for further operations. 5 is a block diagram showing a specific structure of a device for detecting anomalies in a long term evolution system according to a preferred embodiment of the present invention. As shown in FIG. 5, the device further includes: a sending module 46, connected to the determining module 44, and configured to be in the determining module. After determining the UE abnormality, the UE sends an abnormality indication message to the RNLC, where the UE abnormality indication message is used to instruct the RNLC to perform the UE abnormality confirmation detection. 6 is a schematic structural diagram of a system for detecting and reporting a UE anomaly in a long term evolution system according to a preferred embodiment of the present invention. As shown in FIG. 6, the control plane module performs UE anomaly detection, and reports the measurement result to the platform performance statistics module. The performance statistics module of the platform statistics is used to report the drop rate. Finally, the performance data such as the dropped call rate is reported to the Operations & Maintenance Center (OMC). It should be noted that the device for detecting the abnormality of the UE in the long term evolution system described in the device embodiment corresponds to the foregoing method embodiment, and the specific implementation process has been described in detail in the method embodiment, and details are not described herein again. In summary, according to the above embodiments of the present invention, a method and apparatus for detecting UE anomalies in a long term evolution system are provided. The invention confirms that the UE release is triggered by the abnormal removal of the UE, and the release does not count into the call drop rate, which ensures that the performance of the device system is reasonable according to the dropped call rate, and effectively optimizes the RRC in the LTE system. Call drop rate indicator and E-RAB call drop rate indicator. It will be apparent to those skilled in the art that the various modules or steps of the present invention described above can be implemented by a general-purpose computing device that can be centralized on a single computing device or distributed across multiple computing devices. Optionally, they may be implemented by program code executable by the computing device, such that they may be stored in the storage device by the computing device, or they may be separately fabricated into individual integrated circuit modules, or Implementing multiple modules or steps in them as a single integrated circuit module. Thus, the invention is not limited to any specific combination of hardware and software. The above is only the preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes can be made to the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and scope of the present invention are intended to be included within the scope of the present invention.

Claims

Claim

A method for detecting an abnormality of a user equipment UE in a long term evolution system, including:

The medium access control scheduler CMAC detects that the UE continuously receives the non-acknowledgment character NACK or the discontinuous transmission DTX exceeds a preset abnormal threshold value in a preset detection time; the CMAC determines that the UE is abnormal. .

The method according to claim 1, wherein, after the CMAC determines the abnormality of the UE, the method further includes: sending, by the CMAC, a UE abnormality indication message to a radio network layer control plane RNLC, where the UE abnormality indication The message is used to instruct the RNLC to perform UE abnormal acknowledgement detection.

The method of claim 2, after the sending, by the CMAC, the UE abnormality indication message to the RNLC, the method further includes:

Receiving, by the RNLC, a UE abnormality indication message from the CMAC;

Performing, by the RNLC, radio resource control RRC reconfiguration on the UE;

The RNLC determines that the RRC reconfiguration time exceeds a preset time; the RNLC initiates a UE release procedure.

The method of claim 3, after the RNLC performs RRC reconfiguration on the UE, the method further includes:

Receiving, by the RNLC, a reconfiguration complete message from the UE;

The RNLC stops the current UE abnormal acknowledgement detection.

The method according to claim 4, wherein, after the RNLC receives the reconfiguration complete message from the UE, the method further includes: the RNLC sending a first UE normal indication message to the CMAC, where The first UE normal indication message is used to instruct the CMAC to stop the current UE abnormality detection.

The method according to any one of claims 3 to 5, wherein, after the RNLC receives the UE abnormality indication message from the CMAC, the method further includes:

Receiving, by the RNLC, a second UE normal indication message from the CMAC, where the second UE normal indication message is used to indicate that the RNLC stops the UE abnormal acknowledgement detection;

The RNLC stops the current UE abnormality acknowledgement detection. The method according to any one of claims 3 to 5, wherein after the RNLC initiates a UE release procedure, the method further includes:

The counter calculates the number of releases of the UE; the counter calculates the dropped call rate based on the number of releases. The method according to any one of claims 1 to 5, wherein the predetermined detection time is less than a Polling duration of the radio link control RLC multiplied by a maximum number of retransmissions. A device for detecting an abnormality of a UE of a user equipment in a long term evolution system is applied to a media access control scheduler CMAC, including:

The detecting module is configured to detect that the non-acknowledgment character NACK continuously received by the UE or the discontinuous transmission DTX exceeds a preset abnormal threshold value within a preset detection time;

A determining module is configured to determine that the UE is abnormal. The device according to claim 9, wherein the device further comprises: a sending module, configured to send a UE abnormality indication message to the radio network layer control plane RNLC, where the UE abnormality indication message is used to indicate the RNLC UE abnormality confirmation detection.