CN102131257A - Method and system for reporting switching report in mobility optimization - Google Patents
Method and system for reporting switching report in mobility optimization Download PDFInfo
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Abstract
The invention provides a method and system for reporting a switching report in mobility optimization. The method comprises the steps: a user device switches to a purpose cell from a source cell and performs a radio link failure in the purpose cell, and a base station which initiates the rebuilding transmits a radio link failure indication to a purpose base station affiliated to the purpose cell; the purpose base station receives the radio link failure indication, judges a switching scene, and counting cell pair switching report information between the source base station and the purpose base station; and the purpose base station transmits the counted cell pair switching report information to the source base station affiliated to the source cell. As the purpose base station aims at a received RLF (retrorse line feed) indication, the method is used for counting the cell pair switching report information between the source base station and the purpose base station during the mobility optimization, therefore, the signaling load of an X2 interface is reduced, and the optimization switching capability is further improved.
Description
Technical field
The present invention relates to the self-optimization of switching parameter technology in Long Term Evolution (LTE, the Long Term Evolution) system, relate in particular to the method and system that report handover report in a kind of mobility optimization.
Background technology
Long Term Evolution (LTE, Long Term Evolution) network is by land radio access web (E-UTRAN, Evolved UTRAN) base station (eNB, Evolved NodeB) and evolution packet switching center (EPC, Evolved Packet Core) forms the network flattening.Wherein, E-UTRAN comprises the set of the eNB that is connected by the S1 interface with EPC, connects by X2 interface between the eNB.S1, X2 are logic interfacing.An EPC can manage one or more eNB, and an eNB also can be controlled by a plurality of EPC, and an eNB can manage one or more sub-districts.
Self-organizing network (SON, SelfOrganizing Network) is a kind of technology of carrying out network configuration and optimization automatically.The characteristics of this technology are self-configuring, self-optimizing.The application of this technology in LTE makes that eNB can be according to the automatic configuration network parameter of certain measurement, and carries out Automatic Optimal according to network change, thereby keep the network performance optimum, saves great amount of manpower and material resources simultaneously.
For the self-optimization of switching parameter of LTE system, need be according to the operation conditions of network, and switch relevant measurement, optimize the sub-district gravity treatment and switch relevant parameter according to certain algorithm, with the performance of raising network.The switching here comprises the switching of LTE internal system and the switching between system, switching between system refers to UMTS Terrestrial radio access network (UTRAN, UMTS Terrestrial Radio Access Network) or global system for mobile communications (GSM, Global System For Mobile Communication) or the switching of code division multiple access systems such as (CDMA, Code Division Multiple Access).For the optimization (MRO, Mobility Robust Optimization) of mobility handoff parameter, currently mainly be divided into three kinds of scenes, switch too early, switched late and switch to wrong cell.Respectively these three kinds of scenes are described below.
Fig. 1 is the schematic diagram of the existing too early scene that switches, and as shown in Figure 1, subscriber equipment (UE, User Equipment) occurs to the switching of eNB B in eNB A; If UE in the process that connects with eNB B Radio Link Failure (RLF, Radio Link Failure) has taken place, so, UE need be reconstructed among the eNB A; After eNB A receives the request of reconstruction, send the RLF indication can for the eNB B that RLF takes place, eNB B is after receiving the RLF indication, judgement made in context (UE Context) according to the subscriber equipment that keeps before, discovery is to switch too early, sends handover report message informing eNB A for source eNB (being eNB A) and switches too early.
Fig. 2 as shown in Figure 2, if UE at eNB A RLF has taken place at first, is reconstructed into again among the eNB B for the schematic diagram of the existing scene that switched evening; After eNB B receives the request of reconstruction, send the RLF indication to the eNB A that RLF takes place, eNB A makes judging it is to switch evening according to the UE Context that keeps before.
Fig. 3 is the schematic diagram of the scene of the existing wrong cell that switches, and as shown in Figure 3, if UE successful switch has taken place in eNB B in eNB A, then, eNB B RLF takes place and has been reconstructed among the eNB C; After eNB C receives the request of reconstruction, sending RLF indicates to the eNB B that RLF takes place, eNB B is after receiving the RLF indication, make judgement according to the UE Context that keeps before, discovery is after UE switches to wrong cell, send handover report message for source eNB (being eNB A), indication UE has switched to wrong cell.
In switching the evening show scape, rebuild the sub-district and can directly send the RLF indication to the cell-of-origin, the handover event type of self just can directly be judged in the cell-of-origin.And for the scene of switching too early and switch to wrong cell, after rebuilding RLF takes place eNB to UE purpose eNB and having sent the RLF indication, purpose eNB also will send handover report message again to source eNB.Contain switching type in the handover report message, the handover source cell ID switches the purpose cell ID, rebuilds cell ID (when switching to wrong cell), switch reasons.Switching type (current finger switches too early, or switches to wrong cell).Switch reasons is current to be had: wireless reason is switched, the switching that is pressed for time, and resource optimization switches, and reduces that load switches etc.
Fig. 4 is the existing schematic diagram of the scene of switching fast that takes place, scene for quick switching, as shown in Figure 4, UE has switched to the B of sub-district from sub-district A, but after B stop in sub-district is very short, switch to sub-district C again, it is after switching fast that sub-district B judges UE, quick switching has taken place in notification source sub-district A, and cell-of-origin A makes optimizing and revising of handoff parameter.
For the sight that switches too early and switch to wrong cell, after rebuilding RLF takes place eNB to UE eNB and sending the RLF indication, purpose eNB can send handover report message to source eNB at each switching; For the scene of quick switching, sub-district B will send the notice of switching fast to the cell-of-origin at every turn, like this, can cause the signaling traffic load of X2 interface overweight.
Summary of the invention
In view of this, main purpose of the present invention is the method and system that report handover report in a kind of mobility optimization are provided, and can alleviate the signaling traffic load of X2 interface.
For achieving the above object, technical scheme of the present invention is achieved in that
Report the method for handover report in a kind of mobility optimization, subscriber equipment switches to the purpose sub-district and in the purpose sub-district Radio Link Failure takes place from the cell-of-origin, and the purpose base station of base station under the purpose sub-district of initiating to rebuild sends the Radio Link Failure indication,
The purpose base station receives the Radio Link Failure indication, rules out handoff scenario, and the sub-district between statistics source base station and purpose base station is to handover report information;
The purpose base station sends to source base station under the cell-of-origin with the sub-district of statistics to handover report.
Described handoff scenario comprises switches too early, switches to wrong cell, one or more in switching fast.
Sub-district between described statistics source base station and purpose base station to handover report information is:
At each handoff scenario, according to the sub-district to adding up the handover report information that obtains; Described sub-district is to cell-of-origin and purpose sub-district for switching, and wherein the cell-of-origin belongs to described source base station, and the purpose sub-district belongs to described purpose base station; Perhaps,
At different switch reasons, add up the handover report information that obtains for each or more than one handoff scenario.
Described handover report information comprises that switching cell is to tabulation, switching type, switch reasons, statistical information;
Described switching cell comprises cell-of-origin sign, purpose cell ID to tabulation; When described switching type when switching to wrong cell, described switching cell also comprises the reconstruction cell ID to tabulation;
Described statistical information is at the number of times that different switching types, different switch reasons take place between source base station and the purpose base station, and/or the temporal information of statistics.
Report the system of handover report in a kind of mobility optimization, comprise source base station and purpose base station at least, wherein,
Source base station is used to finish subscriber equipment and switches to the purpose sub-district that the purpose base station is administered from the cell-of-origin that source base station is administered; Reception to handover report, and is optimized processing to handoff parameter from the sub-district of purpose base station statistics;
The purpose base station is used to finish subscriber equipment and switches to the purpose sub-district that the purpose base station is administered from the cell-of-origin that source base station is administered, and in the purpose sub-district Radio Link Failure takes place; Reception rule out handoff scenario, and the sub-district between statistics source base station and purpose base station is to handover report information from the Radio Link Failure indication of the base station of initiating to rebuild; With setting in advance sub-district that statistics adds up in the duration handover report is sent to source base station under the cell-of-origin.
Described handoff scenario comprises switches too early, switches to wrong cell, one or more in switching fast.
The technical scheme that provides from the invention described above as can be seen, subscriber equipment switches to the purpose sub-district and in the purpose sub-district Radio Link Failure takes place from the cell-of-origin, the purpose base station of base station under the purpose sub-district of initiating to rebuild sends the Radio Link Failure indication; The purpose base station receives the Radio Link Failure indication, rules out handoff scenario, and the sub-district between statistics source base station and purpose base station is to handover report information; The purpose base station sends to source base station under the cell-of-origin with the sub-district of statistics to handover report.Pass through the inventive method, in the mobility optimizing process, because the purpose base station is at the RLF that receives indication, the sub-district between statistics source base station and purpose base station reports source base station after to handover report information again, reduce the signaling traffic load of X2 interface, further improved the performance of handover optimization.。
Description of drawings
Fig. 1 is the schematic diagram of the existing too early scene that switches;
Fig. 2 is the schematic diagram of the existing scene that switched evening;
Fig. 3 is the schematic diagram of the scene of the existing wrong cell that switches;
Fig. 4 is the existing schematic diagram of the scene of switching fast that takes place;
Fig. 5 reports the flow chart of the method for handover report for the present invention;
Fig. 6 is the schematic diagram of the sub-district under the single handoff scenario between source base station of the present invention and purpose base station to the embodiment of handover report information;
Fig. 7 is the schematic diagram of the sub-district under a plurality of handoff scenario between source base station of the present invention and purpose base station to the embodiment of handover report information;
Fig. 8 is the schematic diagram of the sub-district under the mutual different switch reasons between source base station of the present invention and purpose base station to the embodiment of handover report information.
Embodiment
Fig. 5 is the flow chart that the present invention reports the method for handover report, as shown in Figure 5, comprising:
Step 500: subscriber equipment switches to the purpose sub-district and in the purpose sub-district Radio Link Failure takes place from the cell-of-origin, and the purpose base station of base station under the purpose sub-district of initiating to rebuild sends the Radio Link Failure indication.
This step belongs to prior art, repeats no more here.In switching too early scene, the base station of initiating to rebuild is a source base station; In switching to the wrong cell scene, the base station of initiating to rebuild is the wrong base station that switches to.
Step 501: in the statistics duration that sets in advance, the purpose base station receives the Radio Link Failure indication, rules out handoff scenario, and the sub-district between statistics source base station and purpose base station is to handover report information.Wherein, the statistics duration can dispose by background net management, and webmaster can be according to the overall performance of network, and perhaps cutting off rate takes place UE, and the setting durations such as statistics of RLF take place.
Handoff scenario in this step can comprise switches too early, switches to wrong cell, one or more in switching fast.
For the handover report information of each handoff scenario, can be according to the sub-district to reporting, cell-of-origin and the purpose sub-district of sub-district to being meant switching, wherein the cell-of-origin belongs to source base station, and the purpose sub-district belongs to the purpose base station.The sign of sub-district adopts cellular global identity (ECGI).
Further, for the handover report information of each or several handoff scenario, can report handover report information according to the reason of switching.
Further, handover report information is meant the switch instances of the handoff scenario that takes place in the default statistics duration, such as the switching times that takes place, and/or timing statistics information etc.
Step 502: the sub-district of statistics is sent to source base station under the cell-of-origin to handover report.Source base station can be used to from the sub-district of purpose base station statistics handover report is optimized processing to handoff parameter.
Pass through the inventive method, in the mobility optimizing process, because the purpose base station is at the RLF instruction in the statistics duration, sub-district between statistics source base station and purpose base station reports source base station after to handover report information again, reduce the signaling traffic load of X2 interface, further improved the performance of handover optimization.
At the inventive method, the system that reports handover report in a kind of mobility optimization also is provided, comprise source base station and purpose base station at least, wherein,
Source base station is used to finish subscriber equipment and switches to the purpose sub-district that the purpose base station is administered from the cell-of-origin that source base station is administered; Reception to handover report, and is optimized processing to handoff parameter from the sub-district of purpose base station statistics.
The purpose base station is used to finish subscriber equipment and switches to the purpose sub-district that the purpose base station is administered from the cell-of-origin that source base station is administered, and in the purpose sub-district Radio Link Failure takes place; Reception rule out handoff scenario, and the sub-district between statistics source base station and purpose base station is to handover report information from the Radio Link Failure indication of the base station of initiating to rebuild; With setting in advance sub-district that statistics adds up in the duration handover report is sent to source base station under the cell-of-origin.
Below in conjunction with embodiment the inventive method is described in detail.
Fig. 6 is the schematic diagram of the sub-district under the single handoff scenario between source base station of the present invention and purpose base station to the embodiment of handover report information, in the present embodiment, the handover optimization process is to realize by the interacting message between the base station, present embodiment is: after UE switches to purpose eNB, RLF has taken place, the eNB (source eNB) that rebuilds sends RLF and indicates to behind the purpose eNB, purpose eNB adds up the information of the handover report that belongs to its sub-district with the base station level, again the sub-district of the incident of switching to handover report information unification issue source eNB.As shown in Figure 6, comprising:
Step 600: in the sub-district (cell-of-origin) of source base station (Source eNB) administration, UE switches to and is close to the purpose sub-district that the purpose base station is administered, and afterwards, RLF takes place UE, and to source base station transmission RRC reconstruction request, the RLF indication from source base station is received in the purpose base station subsequently.
Step 601～step 603: in default statistics duration, after the RLF indication is received in the purpose base station, rule out the handoff scenario type for switching too early, all handoff failures that the minizone takes place between statistics source base station and the purpose base station are for switching too early handover report information.
Handover report information comprises: switching cell is to tabulation, switching type, switch reasons, statistical information.Wherein, switching type comprises too early switching, switches to the kind of scenes such as wrong cell; Switching cell comprises the cell-of-origin sign to tabulation, and the purpose cell ID is rebuild cell ID (when switching to wrong cell); Statistical information is at different switching types, the switching times of different switch reasons and/or the temporal information of statistics take place between source base station and the purpose base station, such as the switching between the purpose sub-district of the cell-of-origin of adding up source base station and purpose base station too early down, switch reasons is the number of times that wireless reason is switched.
Step 604: the handover report information that the purpose base station will be added up good sends to source base station.
Step 605: after source base station is received handover report information, the sub-district under this base station is carried out the optimization of sub-district handoff parameter according to switching type in the handover report information and switch reasons.
Embodiment illustrated in fig. 6 is that example is described to switch too early scene, for scene that switches to wrong cell or the quick scene of switching, can adopt equally the inventive method to the sub-district between adopt the method statistic handover report information of statistics after, send to source base station again, specific implementation is to shown in Figure 6 similar, belong to those skilled in the art and easily obtain, repeat no more here according to Fig. 6.
Fig. 7 is the schematic diagram of the sub-district under a plurality of handoff scenario between source base station of the present invention and purpose base station to the embodiment of handover report information, as shown in Figure 7, comprising:
Step 700: in the sub-district (cell-of-origin) that source base station (Source eNB) is administered, UE switches to and is close to the purpose sub-district that the purpose base station is administered, and afterwards, RLF takes place UE, and carried out RRC and rebuild request, the RLF indication of rebuilding affiliated base station, sub-district has been received in the purpose base station subsequently.
Step 701～step 703: in default statistics duration, after the RLF indication is received in the purpose base station, rule out handoff scenario type (as switching too early or switching to wrong cell), add up the handover report information of all handoff failures that the minizone takes place between source base station under the different scenes and the purpose base station respectively.
Handover report information comprises: switching type, switching cell is to tabulation, switch reasons, statistical information.Wherein, switching type comprises too early switching, switches to wrong cell; Switching cell comprises the cell-of-origin sign to tabulation, and the purpose cell ID is rebuild cell ID (when switching to wrong cell).Statistical information is at different switching types, the switching times of different switch reasons and/or the temporal information of statistics take place between source base station and the purpose base station.At switching under the wrong cell scene, between source base station and the purpose base station, switch reasons is the number of times that wireless reason is switched such as statistics.
Step 704: the handover report information that the purpose base station will be added up good sends to source base station.
Step 705: after source base station is received handover report information, the sub-district under this base station is carried out the optimization of sub-district handoff parameter according to switching type in the handover report information and switch reasons.
Embodiment illustrated in fig. 7 is that example is described to switch too early and/or to switch to the wrong cell scene, for fast switching scene, can adopt equally the inventive method to the sub-district between adopt the method statistic handover report information of statistics after, send to source base station again, specific implementation is to shown in Figure 7 similar, belong to those skilled in the art and easily obtain, repeat no more here according to Fig. 7.
Fig. 8 is the schematic diagram of the sub-district under the mutual different switch reasons between source base station of the present invention and purpose base station to the embodiment of handover report information, as shown in Figure 8, comprising:
Step 800: in the sub-district (cell-of-origin) of source base station administration, UE switches to and is close to the purpose sub-district that the purpose base station is administered, and afterwards, RLF takes place UE, and carried out RRC and rebuild request, the RLF indication from base station under the reconstruction sub-district is received in the purpose base station subsequently.
Step 801～step 803: in default statistics duration, after the RLF indication is received in the purpose base station, rule out handoff scenario type and each switch reasons, add up the handover report information of all handoff failures of the minizone generation between all source base stations and the purpose base station at certain switch reasons.
Handover report information comprises: switching cell is to tabulation, switching type, switch reasons, statistical information.Wherein, switching type comprises too early switching, switches to wrong cell; Switching cell comprises the cell-of-origin sign to tabulation, and the purpose cell ID is rebuild cell ID (when switching to wrong cell); Statistical information is to different switching types, the number of times of different switch reasons and/or the temporal information of statistics take place between source base station and the purpose base station, is source base station and all sub-districts between the purpose base station number of times to switching down too early in switching that wireless reason is switched such as the statistics switch reasons.
Step 804: the handover report information that the purpose base station will be added up good sends to source base station.
Step 805: after source base station is received handover report information, the sub-district under this base station is carried out the optimization of sub-district handoff parameter according to switching type in the handover report information and switch reasons.
Embodiment illustrated in fig. 8 is that example is described to switch too early and/or to switch to the wrong cell scene, for fast switching scene, can adopt equally the inventive method to the sub-district between adopt the method statistic handover report information of statistics after, send to source base station again, specific implementation is to shown in Figure 8 similar, belong to those skilled in the art and easily obtain, repeat no more here according to Fig. 8.
The above is preferred embodiment of the present invention only, is not to be used to limit protection scope of the present invention, all any modifications of being done within the spirit and principles in the present invention, is equal to and replaces and improvement etc., all should be included within protection scope of the present invention.
Claims (6)
1. report the method for handover report in the mobility optimization, comprise: subscriber equipment switches to the purpose sub-district and Radio Link Failure takes place in the purpose sub-district from the cell-of-origin, the purpose base station of base station under the purpose sub-district of initiating to rebuild sends the Radio Link Failure indication, it is characterized in that, also comprise:
The purpose base station receives the Radio Link Failure indication, rules out handoff scenario, and the sub-district between statistics source base station and purpose base station is to handover report information;
The purpose base station sends to source base station under the cell-of-origin with the sub-district of statistics to handover report.
2. method according to claim 1 is characterized in that, described handoff scenario comprises switches too early, switches to wrong cell, one or more in switching fast.
3. method according to claim 1 and 2 is characterized in that, the sub-district between described statistics source base station and purpose base station to handover report information is:
At each handoff scenario, according to the sub-district to adding up the handover report information that obtains; Described sub-district is to cell-of-origin and purpose sub-district for switching, and wherein the cell-of-origin belongs to described source base station, and the purpose sub-district belongs to described purpose base station; Perhaps,
At different switch reasons, add up the handover report information that obtains for each or more than one handoff scenario.
4. method according to claim 3 is characterized in that, described handover report information comprises that switching cell is to tabulation, switching type, switch reasons, statistical information;
Described switching cell comprises cell-of-origin sign, purpose cell ID to tabulation; When described switching type when switching to wrong cell, described switching cell also comprises the reconstruction cell ID to tabulation;
Described statistical information is at the number of times that different switching types, different switch reasons take place between source base station and the purpose base station, and/or the temporal information of statistics.
5. report the system of handover report in the mobility optimization, it is characterized in that, comprise source base station and purpose base station at least, wherein,
Source base station is used to finish subscriber equipment and switches to the purpose sub-district that the purpose base station is administered from the cell-of-origin that source base station is administered; Reception to handover report, and is optimized processing to handoff parameter from the sub-district of purpose base station statistics;
The purpose base station is used to finish subscriber equipment and switches to the purpose sub-district that the purpose base station is administered from the cell-of-origin that source base station is administered, and in the purpose sub-district Radio Link Failure takes place; Reception rule out handoff scenario, and the sub-district between statistics source base station and purpose base station is to handover report information from the Radio Link Failure indication of the base station of initiating to rebuild; With setting in advance sub-district that statistics adds up in the duration handover report is sent to source base station under the cell-of-origin.
6. system according to claim 5 is characterized in that, described handoff scenario comprises switches too early, switches to wrong cell, one or more in switching fast.
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| CN107666672A (en) * | 2016-07-26 | 2018-02-06 | 中兴通讯股份有限公司 | Optimization method, the apparatus and system of robustness |
| CN113647140A (en) * | 2019-02-14 | 2021-11-12 | 瑞典爱立信有限公司 | Reporting successful handover to target cell |
| WO2021088270A1 (en) * | 2019-11-08 | 2021-05-14 | 华为技术有限公司 | Mobility optimization method and related apparatus |
| CN115696474A (en) * | 2021-07-22 | 2023-02-03 | 中国电信股份有限公司 | Transmission method of successful switching report and related equipment |
| CN115696474B (en) * | 2021-07-22 | 2024-02-06 | 中国电信股份有限公司 | Transmission method of successful handover report and related equipment |
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