WO2010105567A1 - Procédé, équipement et système d'optimisation de transfert - Google Patents

Procédé, équipement et système d'optimisation de transfert Download PDF

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Publication number
WO2010105567A1
WO2010105567A1 PCT/CN2010/071113 CN2010071113W WO2010105567A1 WO 2010105567 A1 WO2010105567 A1 WO 2010105567A1 CN 2010071113 W CN2010071113 W CN 2010071113W WO 2010105567 A1 WO2010105567 A1 WO 2010105567A1
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Prior art keywords
handover
cell
event
measurement
fails
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PCT/CN2010/071113
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English (en)
Chinese (zh)
Inventor
王彦
赵瑾波
房家奕
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大唐移动通信设备有限公司
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Publication of WO2010105567A1 publication Critical patent/WO2010105567A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off

Definitions

  • handover failure is an easy problem. Since handover failure usually causes dropped calls and seriously deteriorates the user experience, an important goal of network optimization is to reduce the probability of handover failure.
  • an RRC (Radio Resource Control) connection re-establishment process is proposed to remediate handover failure and reduce dropped calls. The probability of occurrence. After the UE (User Equipment) cannot access the target cell and the handover fails, if the UE detects that there is a problem with the radio link and cannot recover within the set time, the UE performs an RRC connection reestablishment process.
  • UE User Equipment
  • Embodiments of the present invention provide a handover optimization method, device, and system to optimize handover parameter settings and reduce the probability of handover failure occurring.
  • a handover optimization method including:
  • the adjustment information of the handover parameter is sent to the cell related to the handover.
  • a handover optimization device including:
  • a parameter adjustment determining unit configured to determine, according to the event, a working frequency point of the event-related cell, a physical layer cell identifier, and a measured value, a handover failure caused by a handover parameter setting and a handover parameter that needs to be adjusted;
  • a sending unit configured to send the adjustment information of the switching parameter to the small area related to the switching.
  • a user equipment including:
  • a recording unit configured to record an event occurring during the handover, a working frequency point of the cell associated with the event, a physical layer cell identifier, and a measured value
  • a sending unit configured to: after the handover fails or after the radio link fails, send the information recorded by the recording unit in the current handover process to the serving base station by using dedicated RRC signaling;
  • a handover optimization system including: a user equipment, a serving base station and a handover optimization device; the user equipment, configured to record an event occurring in the handover process, a working frequency point of the cell related to the event, a physical layer cell identifier, and a measured value, and after the handover fails After the radio link fails, the information recorded in the current handover process is sent to the serving base station through dedicated RRC signaling;
  • the handover optimization device is configured to acquire information recorded in a user equipment handover process from the serving base station, and determine, according to the information, a handover failure caused by inappropriate handover parameter setting and a handover parameter that needs to be adjusted, and the handover parameter is The adjustment information is sent to the cell associated with the handover.
  • the handover optimization method, device and system determine, according to the event recorded by the UE during the handover process, the working frequency of the event-related cell, the physical layer cell identifier, and the measured value, that the handover parameter setting is inappropriate
  • the handover failure and the handover parameter to be adjusted may improve the accuracy of determining the cause of the handover failure, and send the adjustment information of the handover parameter to the cell related to the handover, so that the cell performs corresponding parameter optimization adjustment, thereby reducing handover.
  • the probability of failure increases the user experience.
  • FIG. 1 is an air interface signaling interaction process in a prior art handover process
  • FIG. 2 is a flowchart of a handover optimization method according to an embodiment of the present invention.
  • FIG. 3 is a schematic structural diagram of a handover optimization apparatus according to an embodiment of the present invention.
  • FIG. 5 is a schematic diagram of networking of a handover optimization system according to an embodiment of the present invention.
  • the embodiment of the present invention is directed to the handover failure phenomenon occurring in the LTE (Long Term Evolution) network, and determines the real cause of the failure according to the event and measurement information reported by the UE, and then automatically adjusts the handover parameter to reduce Switching failure probability, reducing call drop rate and improving user experience.
  • LTE Long Term Evolution
  • Figure 1 shows the air interface signaling interaction process during a handover process, including the following steps:
  • the source cell sends a handover preparation message to one or more cells (including the target cell and the preparation cell), and after the cells allocate radio resources to the UE, the cell returns a handover preparation confirmation message;
  • the source cell determines which one to prepare the cell as the target cell for handover according to the relevant criteria, and then sends an RRC reconfiguration message to the UE, that is, a handover command;
  • the UE performs downlink synchronization with the target cell
  • the UE After synchronization, the UE sends an uplink random access preamble (dedicated or random) to the target cell;
  • the UE After receiving the response message of the target side, the UE sends an uplink RRC reconfiguration complete message, that is, the handover is completed; 9.
  • the MAC layer logical entity of the target cell successfully receives the reconfiguration complete message, sends a HARQ acknowledgment message to the UE, and sends a path switch message to the MME (Mobility Management Entity, mobility management entity);
  • the RLC (Radio Link Control) layer logic entity of the target cell sends downlink status information.
  • the target cell sends a resource release message to the source cell.
  • the UE uses the dedicated preamble on the target side, if the UE receives the A3 message, the UE considers that the handover is successful. For the case where the UE uses the random preamble, only when the UE receives the A6 message, that is, the first When the downlink PDCCH control signaling is used, the handover is considered successful.
  • the RRC layer signaling messages sent on the air interface during the handover process mainly include: a measurement report, a handover command, and a handover confirmation.
  • the measurement report is an uplink message sent by the UE to the network side
  • the handover command is a downlink message sent by the source cell to the UE
  • the handover confirmation is an uplink message sent by the UE to the target cell of the handover.
  • Measurement 4 The report is lost. When the measurement fails to be successfully sent to the network side and the maximum number of retransmissions is reached, the UE initiates an RRC reestablishment. It is also possible that the user's radio channel quality deteriorates to a certain extent before the maximum number of times is reached, the radio link fails, and the UE initiates RRC reestablishment.
  • the UE may start the RRC measurement 4 report to the source cell, until the RRC re-establishment process ends, and record a series of events and measurement information that occurs during the recording, after the handover fails, the UE will record the event and
  • the measurement information is sent to the SON function entity, and the SON (Self-Organizing Networks) functional entity determines the handover failure due to the inappropriate handover parameter setting and the handover parameter that needs to be adjusted according to the event and measurement information, and the parameter is switched.
  • the adjustment information is sent to the cell associated with the handover.
  • the SON function entity is a logical entity, which may be located in the operation management system of the network, or part of the function is located in the operation management system, and another part of the function is located in the base station.
  • the specific application may be determined according to actual needs, which is not limited by the embodiment of the present invention.
  • FIG. 2 it is a flowchart of a UE handover optimization method according to an embodiment of the present invention, which mainly includes the following steps:
  • Step 201 Obtain an event and measurement information recorded during a UE handover process.
  • a series of events, objects, and measurement information that may occur during the recording, from the start of the measurement report by the UE until the end of the RRC re-establishment process, whether the handover succeeds or fails mainly includes:
  • PCI Physical Cell Identifier
  • the UE If the UE has a positioning function, it also records the geographical position coordinates of the UE when the event occurs.
  • the SON function entity determines, according to a large number of UE handover failure records collected from the network, that is, events and measurement information recorded by the UE during the handover process, determining handover failures due to inappropriate handover parameters and handover parameters that need to be adjusted, and determining specifically The process will be described in detail later. If the SON function entity can also obtain the moving speed estimated by the UE itself, it can be set to determine the switching parameter that needs to be adjusted according to the method of the embodiment of the present invention when the moving rate of the UE does not exceed a predetermined value, otherwise other methods may be adopted. to make sure.
  • the predetermined time threshold is specifically: the timeout period of the handover failure configured by the network for the UE; or the duration of the radio link failure detection; or the timeout period of the handover failure configured by the UE for the UE and the duration of the radio link failure detection. Larger time; or greater than the timeout period for the handover failure configured by the network for the UE, and greater than the duration of the radio link failure detection.
  • the events for comprehensively determining the handover failure caused by the inappropriate handover parameter setting and the handover parameters that need to be adjusted are consistent with the requirements of the causal association event.
  • the following further describes the handover and RRC re-establishment process of the UE, and details how the SON functional entity determines that the handover parameter is inappropriate due to different handover failures.
  • the measurement reports described below do not include the 4 reports for SON ANR (Automatic Neighbour Relation) measurements, and the measures for measuring the gap (measurement interval) switch control.
  • the scenario is as follows: The UE sends a measurement report, but does not receive the acknowledgement information returned by the network until the maximum number of transmissions is reached, the RLC layer reports an error, or the radio link fails according to the physical layer detection; then the UE initiates an RRC re-establishment process, but reconstructs Failure, the RRC connection of the UE is lost, enters an idle state, and camps on another cell different from the source serving cell, and the cell is a cell.
  • the SON function entity records events and measurement signals recorded during the UE handover process. Check whether the reconstructed cell A is included in the measurement report.
  • the scenario is as follows: The UE successfully sends a measurement report, the radio link fails soon, and the handover command is not received before the radio link fails. Then the UE initiates RRC reestablishment, the reestablishment is successful, and the UE transfers to another cell.
  • Cell is a cell
  • the RRC re-establishment is successful, indicating that the cell B that is finally camping appears in the measurement report message, satisfies the handover requirement, and is selected by the base station as the handover preparation cell.
  • the RSRP and/or RSRQ values of the serving cell at the two moments when the measurement report is sent and when the radio link fails, and the new cell (ie, the cell B after the reconstruction) are in the measurement report. And RSRP and/or RSRQ values after reconstruction.
  • the switching parameters may be inappropriate, resulting in too late switching.
  • the signal quality of the serving cell has been difficult to ensure the correct reception of the air interface message. In this case, it is necessary to lower the switching threshold, and / or reduce the hysteresis value, and / or reduce the measurement result reporting trigger time, so that the switching action can be advanced.
  • the first threshold, the second threshold, and the third threshold described above may be based on actual application rings. Set it up.
  • the scenario is as follows: The UE sends a measurement report, and receives the handover command, but the access fails on the target side, and then the UE initiates RRC reconstruction, the reconstruction is successful, and the UE returns to the source cell before the handover.
  • the handover requirement can be improved by changing the handover parameters, such as increasing the handover threshold, and/or increasing the hysteresis value, so that the handover is triggered when the target 'J, the zone strength reaches a higher level.
  • the target cell sends the measurement report to the UE when the UE transmits the measurement report due to the actual propagation environment.
  • the position signal described is relatively strong, but is still weak at other locations. In this case, the triggering time of the measurement result can be increased, and the jitter of the neighboring cell signal at the boundary is filtered to some extent by delaying the measurement reporting.
  • the fourth threshold and the fifth threshold described above may be set according to an actual application environment.
  • the scenario is as follows: The UE sends a measurement report, and receives the handover command, and then the random access in the target cell is successful, but the uplink handover message fails to be sent. After the maximum number of transmissions is reached, the UE initiates RRC reconstruction, the reconstruction succeeds, and the UE returns to the handover. Source cell.
  • the scenario is similar to the scenario in the third scenario.
  • the SON function entity determines the event and measurement information recorded during the UE handover process.
  • the process of switching failure caused by the switching parameters and the switching parameters that need to be adjusted is similar to the process in the third case described above, and will not be described in detail herein.
  • the handover threshold refers to a difference between a signal strength of a neighboring cell and a current serving cell when the handover trigger condition is determined.
  • the hysteresis value refers to that the difference between the signal strength of the neighboring cell and the current serving cell reaches the threshold, and the difference condition is considered to satisfy the trigger condition.
  • the additional difference is the hysteresis value, which is mainly used to prevent Ping Pong switching.
  • the triggering time of the measurement result is that the terminal needs to continue to send the report to the network after the measurement result meets the reporting condition for a period of time, which is mainly used to prevent the measurement result from being shaken.
  • Step 203 Send the adjustment information of the handover parameter to the cell related to the handover.
  • the SON functional entity sends an instruction to the corresponding cell through the base station, indicating that the inappropriate parameter is modified.
  • the adjustment information of the switching parameter may be: directly indicating that a certain switching parameter is adjusted to a certain value, or indicating an adjustment change amount of a certain switching parameter, and preferably, the direction is adjusted by "+" and "-". For example: For the switching threshold, the value is 10 before the adjustment, and the value after the adjustment should be 8, the adjustment information of the switching threshold is "8" or "-2".
  • the method for adjusting the direction of the foregoing identifier is only a preferred embodiment of the present invention. Any manner in which the SQN and the network side are well-known to adjust the direction of the identifier belong to the protection scope of the present invention, for example: Raise, use the "b" logo to reduce, such as "b2" to reduce 2 units.
  • the handover optimization method determines, according to an event recorded by the UE in the handover process, a working frequency point of the event-related cell, a physical layer cell identifier, and a measured value, a handover failure caused by an inappropriate handover parameter and
  • the handover parameter that needs to be adjusted can improve the accuracy of determining the cause of the handover failure, and the adjustment information of the handover parameter is sent to the cell related to the handover, so that the cell performs corresponding parameter optimization adjustment, thereby reducing the probability of handover failure.
  • the embodiment of the present invention further provides a handover optimization device. As shown in FIG. 3, it is a schematic structural diagram of the handover optimization device.
  • the switching optimization device includes: an obtaining unit 301, a parameter adjustment determining unit 302, and The transmitting unit 303. among them:
  • the obtaining unit 301 is configured to acquire an event recorded during a UE handover process, a working frequency point of the cell related to the event, a physical layer cell identifier, and a measured value;
  • the parameter adjustment determining unit 302 is configured to determine, according to the event, a working frequency point and a physical layer cell identifier of the event-related cell, and a measured value, a handover failure caused by the handover parameter and a handover parameter that needs to be adjusted;
  • the sending unit 303 is configured to send the adjustment information of the handover parameter to the cell related to the handover.
  • the event includes any one or more of the following events: measurement success or failure of transmission, failure of the radio link, whether the UE receives the network before the radio link fails.
  • the measured value includes: a reference symbol received power of the cell related to the event, and/or a reference symbol reception quality of the cell related to the event, when the event occurs, and may further include: a UE estimated moving speed , the geographic location coordinates of the UE.
  • the parameter adjustment determining unit 302 can further determine whether the switching parameter needs to be adjusted in conjunction with the moving speed of the UE.
  • a preferred structure of the parameter adjustment determining unit 302 is as shown in FIG. 3, including: a handover failure state determining sub-unit 321, a measurement value comparison sub-unit 322, and a handover parameter analysis sub-unit 323. among them:
  • a handover failure state determining sub-unit 321 configured to determine, according to the event, a working frequency point of the event-related cell, and a physical layer cell identifier, a UE handover failure scenario;
  • the handover parameter analysis sub-unit 323 is configured to determine a handover parameter that needs to be adjusted according to a scenario in which the UE handover fails and a comparison result of the measurement value comparison sub-unit 322. Specifically, there are several situations in which you need to adjust the switching parameters:
  • the post-reconstruction fails and resides in a cell included in the measurement report, and the measurement value of the cell in the measurement report is higher than the corresponding measurement value of the cell after the reconstruction failure, and is higher than the corresponding measurement of the serving cell in the measurement report.
  • the value of the switching parameter that needs to be adjusted includes any one or more of the following: lowering the switching threshold, reducing the hysteresis value, and reducing the triggering time of the measurement result reporting;
  • the re-establishment succeeds and camps on a handover preparation cell included in the measurement report, and the measurement report is generated and the wireless generation occurs.
  • the measurement values of the original serving cell at the two moments of the link failure are different from the first threshold, and the measured values of the handover preparation cells are different in the measurement report and after the reconstruction is lower than the second threshold, and the handover preparation is performed.
  • determining that the handover parameter to be adjusted includes any one or more of the following: The threshold value, the hysteresis value is reduced, and the triggering time of the measurement result is reduced;
  • determining that the handover parameter that needs to be adjusted includes any one or more of the following: increasing the handover threshold and increasing the hysteresis value;
  • determining the switching parameters that need to be adjusted includes: increasing the measurement result reporting trigger time.
  • each unit may be centrally distributed in a management operating system in the network, or may be distributed in the management operating system and the base station.
  • the handover optimization device determines, according to the event recorded by the UE during the handover process, the working frequency of the event-related cell, the physical layer cell identifier, and the measured value, the handover failure and the need due to the inappropriate handover parameter setting. Adjusted switch parameters The number can be improved to determine the accuracy of the cause of the handover failure, and the adjustment information of the handover parameter is sent to the cell related to the handover, so that the cell performs corresponding parameter optimization and adjustment, thereby reducing the probability of handover failure and improving the user experience. .
  • the embodiment of the invention further provides a user equipment, as shown in FIG. 4, which is a schematic structural diagram of the user equipment.
  • the user equipment includes: a recording unit 401, a transmitting unit 402, and a deleting unit 403. among them:
  • the recording unit 401 is configured to record an event occurring during the handover, a working frequency of the cell related to the event, a physical layer cell identifier, and a measured value, and specific events and measured values have been described in detail above. Let me repeat.
  • the sending unit 402 is configured to send the information recorded by the recording unit 401 in the current switching process to the serving base station by using dedicated RRC signaling after the handover fails or after the radio link fails.
  • the event setting unit 404 may be further included in the embodiment of the present invention.
  • Each record of 401 sets a valid time.
  • the deleting unit 403 is further configured to delete the record after the record exceeds its valid time.
  • a series of events and measurement values recorded in the recording unit 401 form a handover abnormality or a radio link failure log record.
  • the sending unit 402 records the records. It is transmitted to the base station, and then forwarded by the base station to the SON functional entity in the network. For example, after the handover fails, RRC reconstruction is performed. If the RRC re-establishment is successful and the UE is still in the connected state, the new serving base station transmits the records to the SON function entity in the network through the base station; if the RRC reestablishment fails, the UE loses the connection and enters the idle state.
  • the transmitting unit 402 transmits the records to the SON function entity in the network through the serving base station. If the records are still not transmitted to the base station after the valid time expires, the deletion unit 403 deletes the records.
  • the setting of the effective time can be flexibly determined, such as 1 minute or 5 minutes.
  • the user equipment in the embodiment of the present invention can provide effective reference information for handover optimization, so that the SON functional entity in the network can refer to the information to determine handover abnormalities or radio link failures caused by inappropriate handover parameters.
  • the embodiment of the present invention further provides a handover optimization system, as shown in FIG. 5, which is a networking diagram of the system.
  • the system includes: a user equipment 501, a serving base station 502, and a handover optimization device 503. among them:
  • the user equipment 501 is configured to record an event that occurs during the handover, a working frequency point of the cell related to the event, a physical layer cell identifier, and a measured value, and after the handover fails or the radio link fails, the current handover is performed.
  • the information recorded in the process is sent to the serving base station 502 through dedicated RRC signaling.
  • the switching optimization device 503 is configured to acquire information recorded during the user equipment handover process from the serving base station 502, and determine, according to the information, a handover failure caused by the handover parameter and a handover parameter that needs to be adjusted, and send the adjustment information of the handover parameter. Give the cell associated with the handover.
  • the user equipment 501 may transmit the recorded information by using an existing air interface signaling message, or may transmit by using a new dedicated signaling message, and the serving base station 502 receives the record information sent by the user equipment 501. Thereafter, it is forwarded to the handover optimization device 503.
  • the user equipment 501 may further carry the recorded information in the uplink data packet, and after receiving the data packet, the serving base station 502 extracts the recorded information from the data packet, and forwards the information to the handover optimization device. 503.
  • the serving base station 502 can query the local neighbor relationship table according to the frequency of the cell before forwarding the record to the handover optimization device 503. Point and physical layer cell identifier, obtain the global identifier of each cell in the record, and add to the corresponding record, so that The handover optimization device 503 can correctly identify each cell.
  • FIG. 4 and FIG. 3 The specific structure of the user equipment and the handover optimization device in the embodiment of the present invention can be referred to FIG. 4 and FIG. 3 and corresponding text descriptions, respectively, and details are not described herein again.
  • the handover optimization system determines, according to the event recorded by the UE during the handover process, the working frequency of the event-related cell, the physical layer cell identifier, and the measured value, the handover failure caused by the inappropriate handover parameter setting and
  • the handover parameter that needs to be adjusted can improve the accuracy of determining the cause of the handover failure, and the adjustment information of the handover parameter is sent to the cell related to the handover, so that the cell performs corresponding parameter optimization adjustment, thereby reducing the probability of handover failure. Improve the user experience.
  • the present invention can be implemented by means of software plus a necessary general hardware platform, and of course, can also be through hardware, but in many cases, the former is a better implementation. the way.
  • the technical solution of the present invention which is essential or contributes to the prior art, can be embodied in the form of a software product stored in a storage medium such as: ROM (Read-Only Memory, read-only memory) / RAM (Random Access Memory), disk, CD, etc.
  • the storage medium includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute the program.

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

Abstract

La présente invention porte sur un procédé, un équipement et un système d'optimisation de transfert, le procédé comprenant : l'acquisition d'un évènement, d'un point de fréquence de travail et d'un identifiant de cellule de couche physique d'une cellule liée à l'évènement et d'une valeur de mesure enregistrée durant un processus de transfert d'un équipement utilisateur (UE); selon l'évènement, le point de fréquence de travail et l'identifiant de cellule de couche physique de la cellule liée à l'évènement et à la valeur de mesure, la détermination d'un échec de transfert dû à un réglage inapproprié de paramètres de transfert et des paramètres de transfert devant être ajustés; et la transmission d'informations d'ajustement des paramètres de transfert à la cellule liée au transfert. Grâce à la présente invention, le réglage de paramètres de transfert peut être optimisé, et la probabilité d'occurrence d'un échec de transfert peut être réduite.
PCT/CN2010/071113 2009-03-17 2010-03-17 Procédé, équipement et système d'optimisation de transfert WO2010105567A1 (fr)

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CN2009100802868A CN101841835B (zh) 2009-03-17 2009-03-17 切换优化方法、设备及系统

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