CN103906102A - Short stay detection optimization method and short stay detection optimization system - Google Patents
Short stay detection optimization method and short stay detection optimization system Download PDFInfo
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- CN103906102A CN103906102A CN201210585047.XA CN201210585047A CN103906102A CN 103906102 A CN103906102 A CN 103906102A CN 201210585047 A CN201210585047 A CN 201210585047A CN 103906102 A CN103906102 A CN 103906102A
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Abstract
The invention discloses a short stay detection optimization method and a short stay detection optimization system which are used for optimizing signaling waste and user experience reduction caused by unreasonable mobility and power parameter configuration in a wireless network. The short stay detection optimization method comprises the following steps: a first cell base station counts the stay time of a user terminal in a first cell when determining to switch the user terminal to a second cell, and adds the stay time to historical information of the user terminal; a second cell base station judges whether the user terminal has unnecessary short stay in the first cell according to the historical information of the user terminal; and if the user terminal has unnecessary short stay in the first cell, the second cell base station sends a short stay report to an optimization server, and the optimization server uses the short stay report to optimize a network system. Therefore, short stay can be accurately identified, unnecessary reports can be avoided, and network optimization can be realized.
Description
Technical field
The present invention relates to the communications field, particularly a kind of of short duration resident inspection optimization method and system.
Background technology
In 3GPP(The3rd Generation Partnership Project, third generation partner program) in the research on standard of R11, the problem of the detection method of the user terminal of short duration resident (Short Stay) between base station is discussed.According to of short duration resident definition: of short duration resident Shi Cong community A is switched to community B resident after a finite time, has been switched to another one community C, as shown in Figure 1.Of short duration resident meeting increases signaling consumption and the unnecessary forward of packet of network, and may cause the decline of systematic function and end-user experience.Therefore how to reduce unnecessary of short duration resident be an important subject to optimize mobility.
In current handover mechanism, in the time that user terminal will be switched to other communities, cell-of-origin A can be this user terminal in the resident relevant information of the cell-of-origin A (size of cell-of-origin, the ECGI of source base station and residence time) add in the historical information of user terminal, and notice is to Target cell B.Wherein for pingpang handoff, base station can judge by the historical information that checks user terminal, but for of short duration resident scene, because community A possibly cannot obtain the relevant information that user terminal switches in the B of community, thereby community A does not also know that of short duration resident situation has appearred in community B, therefore only check that the historical information of terminal can not be adapted in the detection and optimization of of short duration resident scene.
A kind of detection scheme has been proposed at present in the prior art.This scheme is thought and is triggered first community of switching having occurred of short durationly to need after resident notifiedly, then determines whether to need to adjust according to this message the trigger condition of switching.This message need to comprise residence time, switch reasons, QoS(Quality of Service, service quality) information etc.The particular content of this scheme is as follows:
1) when a user terminal is switched to Yi Ge community, the minimum residence time of this user terminal is estimated in base station first.
2) if the ratio expected time that follow-up switching occurs wants Zao, base station need to increase a flag bit and indicate this user terminal residence time shorter in historical information.
3) if residence time is long, but find that in the historical information of user terminal, one or more community residence time is shorter, need this information to send to relatively Duan community of recent residence time.
The shortcoming that this scheme exists is:
The first, based on existing LTE(Long Term Evolution, Long Term Evolution) framework, base station side lacks the speed of user terminal, the information such as the direction of motion, can there is very large deviation in its minimum residence time estimating, therefore can cause follow-up a large amount of erroneous judgements.
The second, cannot determine this of short duration resident whether be necessary switching, for example, for the scene in Fig. 2, in the A of community, community B is mainly used to make up covering cavity, therefore the of short duration resident of this switching initiation is to be necessary, and method based in such scheme, community B cannot know whether user terminal is because cover switching not good and that cause.
Three, the appearance of whole of short duration resident phenomenon may be to have caused unnecessary switching due to the handoff parameter of community A and the problem of RRM strategy (as the blind switching in load balancing process), therefore in such scheme, only message is sent to the community that of short duration resident phenomenon occurs, and problem base station cannot obtain above-mentioned information, thereby cannot carry out follow-up optimization.
Also proposed in the prior art the scheme of the of short duration presence information of interactive user terminal between a kind of base station, the main thought of this scheme is to send the report of short duration resident handover source base station of notification triggers (community A) by there is of short duration resident base station (community B).The content of this scheme is:
[1]. switching type (Handover Type): intra-LTE, LTE to UTRAN(UMTS Terrestrial Radio Access Network, UMTS Terrestrial radio access network), LTE to GERAN(GSM EDGE Radio Access Network, GSM EDGE wireless access network).
[2]. the mark of cell-of-origin (community A).
[3]. the mark of middle community (community B).
[4]. the mark of the Target cell (community C) of switching: if pingpang handoff, the mark of the Target cell of switching equals the mark of cell-of-origin.
[5]. the of short duration resident duration: first switching is accomplished to second time interval between switching initialization.
[6]. handover trigger event: the event type of second switching.
[7]. measurement event result: user terminal measurement result in second switching.
The shortcoming of this scheme is:
The first, problem detection node placement is in middle community, the calculating of of short duration residence time may be wrong, when terminal is switched to from community B the process of community C may handoff failure, or be reconstructed into community C or community B, and this phenomenon is not just of short duration resident, but to be grouped into late the detection and the optimizing process that switch/switch too early.
The second, the trigger event switching: carried the trigger event switching in this scheme, because switching is to be carried out according to the auxiliary of handover trigger event by base station side, simple handover trigger event can not equal the handoff threshold that community B arranges, and therefore handover trigger event does not have too large help to optimizing and detecting.
Three, this mechanism may cause a large amount of wastes of signaling, for example, for pingpang handoff, its switching feature is to switch and exceed more than 3 times back and forth between community A and community B, community B can send to community A report so, same community A also can send to community B report, along with the repeatedly switching of terminal between community A and B, so just cause the generation of many unnecessary reports.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of of short duration resident inspection optimization method and system.Collect the relevant information in twice adjacent handoff procedure of user terminal by the first cell base station, the second cell base station judges whether to have occurred unnecessary of short duration resident thus, if occurred unnecessary of short duration resident, generate of short duration resident report and notify Optimized Service device, Optimized Service device completes optimization process according to the of short duration resident report of collecting.Can accurately identify thus of short duration residently, avoid producing unnecessary report simultaneously, be conducive to realize the network optimization.
According to an aspect of the present invention, provide a kind of of short duration resident inspection optimization method, comprising:
The first cell base station is in the time determining user terminal to be switched to the second community, the residence time of counting user terminal in the first community, and residence time is added in the historical information of user terminal, wherein residence time is that user terminal Cong tri-communities are accessed behind the first community, determined user terminal to be switched to the time interval between the second community to the first cell base station;
The second cell base station is according to the historical information of user terminal, judges whether user terminal has occurred in the first community unnecessary of short duration resident;
If user terminal has occurred unnecessary of short duration resident in the first community, the second cell base station sends of short duration resident report to Optimized Service device;
Optimized Service device utilizes of short duration resident report to be optimized processing to network system.
According to a further aspect in the invention, provide a kind of of short duration resident inspection optimization system, comprising:
The first cell base station, for in the time determining user terminal to be switched to the second community, the residence time of counting user terminal in the first community, and residence time is added in the historical information of user terminal, wherein residence time is that user terminal Cong tri-communities are accessed behind the first community, determined user terminal to be switched to the time interval between the second community to the first cell base station;
The second cell base station, be used for according to the historical information of user terminal, judge whether user terminal has occurred in the first community unnecessary of short duration resident, unnecessary of short duration resident if user terminal has occurred in the first community, send of short duration resident report to Optimized Service device;
Optimized Service device, for utilizing of short duration resident report to be optimized processing to network system.
Brief description of the drawings
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, to the accompanying drawing of required use in embodiment or description of the Prior Art be briefly described below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, do not paying under the prerequisite of creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 is the first network schematic diagram of describing of short duration resident phenomenon.
Fig. 2 is the second network schematic diagram of describing of short duration resident phenomenon.
Fig. 3 is the schematic diagram of an embodiment of the of short duration resident inspection optimization method of the present invention.
Fig. 4 is the schematic diagram that the present invention judges whether to occur a unnecessary of short duration resident embodiment.
Fig. 5 is the schematic diagram that network systems optimum of the present invention is processed an embodiment.
Fig. 6 is the schematic diagram of an embodiment of the of short duration resident inspection optimization system of the present invention.
Fig. 7 is the schematic diagram of of short duration resident another embodiment of inspection optimization system of the present invention.
Fig. 8 is the schematic diagram of of short duration resident phenomenon inspection optimization in Intra-LTE scene of the present invention.
Fig. 9 is the schematic diagram of of short duration resident phenomenon inspection optimization in Inter-RAT scene of the present invention.
Figure 10 is the schematic diagram of of short duration resident phenomenon inspection optimization in isomery scene of the present invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiment.Illustrative to the description only actually of at least one exemplary embodiment below, never as any restriction to the present invention and application or use.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtaining under creative work prerequisite, belong to the scope of protection of the invention.
Unless illustrate in addition, otherwise the parts of setting forth in these embodiments and positioned opposite, numeral expression formula and the numerical value of step not limited the scope of the invention.
, it should be understood that for convenience of description, the size of the various piece shown in accompanying drawing is not to draw according to actual proportionate relationship meanwhile.
May not discuss in detail for the known technology of person of ordinary skill in the relevant, method and apparatus, but in suitable situation, described technology, method and apparatus should be regarded as authorizing a part for specification.
In all examples with discussing shown here, it is exemplary that any occurrence should be construed as merely, instead of as restriction.Therefore, other example of exemplary embodiment can have different values.
It should be noted that: in similar label and letter accompanying drawing below, represent similar terms, therefore, once be defined in an a certain Xiang Yi accompanying drawing, in accompanying drawing subsequently, do not need it to be further discussed.
Fig. 3 is the schematic diagram of an embodiment of the of short duration resident inspection optimization method of the present invention.As shown in Figure 3, the of short duration resident inspection optimization method step of the present embodiment is as follows:
The of short duration resident inspection optimization method providing based on the above embodiment of the present invention, the first cell base station is in the time determining user terminal to be switched to the second community, the residence time of counting user terminal in the first community, and residence time is added in the historical information of user terminal, the second cell base station is according to the historical information of user terminal, judge whether user terminal has occurred in the first community unnecessary of short duration resident, if user terminal has occurred unnecessary of short duration resident in the first community, the second cell base station sends of short duration resident report to Optimized Service device, Optimized Service device utilizes of short duration resident report to be optimized processing to network system.Can accurately identify thus of short duration residently, avoid producing unnecessary report simultaneously, be conducive to realize the network optimization.
Preferably, Optimized Service device is OAM(Operation And Maintenance, Operation and Maintenance) server.Also can be from the historical information of this user terminal, to find out the base station under the last community that does not occur of short duration resident phenomenon in before resident community, this user terminal Zhe community.
Preferably, resident threshold value is configured by OAM, and this value relevant to several factors (as the size of base station, the type of switching etc.), can arrange according to engineering experience and emulation.
Preferably, the related content that the presence information of user terminal Zhe community defines in comprising existing standard, also comprise following but be not limited to following content:
[1]. the failed list of carrying (mark and the failure cause of failure carrying, these carryings are because problem is collected community because certain reason cannot be received and be produced).
[2]. terminal collects in problem the measurement report reporting in community.
Fig. 4 is the schematic diagram that the present invention judges whether to occur a unnecessary of short duration resident embodiment.As shown in Figure 4, the method step of above-mentioned steps 302 is as follows:
Preferably, above-mentioned the second cell base station is receiving after handover request, also comprises:
The second cell base station postpones predetermined time interval.
Then carry out the historical information of utilizing user terminal, judge whether residence time is less than the step of predetermined residence time threshold value.
Wherein, the effect in this time interval is mainly used to prevent that user is receiving that switching command, within the very short time after successful switch, Radio Link Failure occurs, if there is Radio Link Failure within this time, this problem does not belong to of short duration resident research range, and belonged to the determination range of switching late, at the SON(Self of R9/R10 Organizing Network, self-organizing network) existing relevant resolution policy in standard.
Preferably, the second cell base station further judges that the resident step that whether be necessary of user terminal in the first community comprises:
The second cell base station further judges whether the signal strength signal intensity of the first community, the second community He tri-communities is all greater than signal strength threshold, and wherein the signal strength signal intensity of the first community, the second community He tri-communities is included in the historical information of user terminal.
If the signal strength signal intensity of the first community, the second community He tri-communities is all greater than signal strength threshold, the second cell base station judges resident there is no need of user terminal in the first community.
Preferably, judge that the of short duration resident basis for estimation whether being necessary can also comprise following content (but being not limited to this):
1) after user terminal is switched to of short duration persistent district, whether its carrying is affected.
2) the covering object of the of short duration persistent district of user terminal.
Wherein according to 1), user terminal in handoff procedure for some reason (CS business is not supported in community, or the business of other types) caused carrying to be accepted, this switching may there is no need so.
According to 2), be mainly for the scene in Fig. 2, if the object of the of short duration resident cell deployment of terminal is to dispose regional covering cavity in order to solve, this switching may be necessary so, otherwise may cause the appearance of call drop.
Belong to necessary of short duration resident for judgement, subsequent treatment is not done in the second community, and for non-essential of short duration resident, therefore needs to Optimized Service device to send of short duration resident report, and the content of report can (but being not limited to this) as described below:
[1]. switching type (Handover Type)
[2]. the mark of cell-of-origin (San community)
[3]. switch reasons
[4]. the mark of of short duration persistent district (the first community)
[5]. the mark of detected cells (the second community)
[6]. carrying failed list
[7]. report time point
Repeatedly report information of Optimized Service device basis, classifies according to the mark of switch reasons and of short duration persistent district, if the same class switching times ratio that the number of times that problem occurs in a period of time accounts for exceedes triggering thresholding, thinks and need to carry out Optimum Operation.The value that wherein triggers thresholding can be configured by operator by emulation or engineering experience value, and Optimized Service device can complete optimizing process by adjusting the handoff parameter of cell-of-origin or the mobility of of short duration resident community or covering parameter.
Fig. 5 is the schematic diagram that network systems optimum of the present invention is processed an embodiment.As shown in Figure 5, utilize of short duration resident report to be optimized in the step of processing network system at above-mentioned Optimized Service device, further comprise:
Preferably, the step that above-mentioned Optimized Service device is optimized processing to system parameters comprises:
Optimized Service device judges whether the covering object of the first community is to cover cavity in order to make up;
If the covering object of the first community is to cover cavity in order to make up, Optimized Service device reduces the base station transmitting power of the first community.
Because the covering object of the first community is to cover cavity in order to make up, the situation of for example Fig. 2, therefore such switching is necessary.For fear of of short duration resident generation, can realize by the base station transmitting power that reduces the first community.
Preferably, if the covering object of the first community is not to cover cavity in order to make up, Optimized Service device instruction the 3rd cell base station improves the switching individual character offset parameter with respect to the first community; Or instruction the 3rd cell base station is not using the first community as switching target small area.
Due to the covering object of the first community and be to cover cavity in order to make up, the situation of for example Fig. 1, can realize with respect to the switching individual character offset parameter of the first community by indicating the 3rd cell base station to improve, and preferred increase rate is 2dB.Or the first community is not realized as switching target small area by indicating the 3rd cell base station.
Fig. 6 is the schematic diagram of an embodiment of the of short duration resident inspection optimization system of the present invention.As shown in Figure 5, of short duration resident inspection optimization system comprises the first cell base station 601, the second cell base station 602 and Optimized Service device 603.Wherein:
The first cell base station 601, for in the time determining user terminal to be switched to the second community, the residence time of counting user terminal in the first community, and residence time is added in the historical information of user terminal, wherein residence time is that user terminal Cong tri-communities are accessed behind the first community, determined user terminal to be switched to the time interval between the second community to the first cell base station.
The second cell base station 602, be used for according to the historical information of user terminal, judge whether user terminal has occurred in the first community unnecessary of short duration resident, unnecessary of short duration resident if user terminal has occurred in the first community, send of short duration resident report to Optimized Service device 603.
Optimized Service device 603, for utilizing of short duration resident report to be optimized processing to network system.
The of short duration resident inspection optimization system providing based on the above embodiment of the present invention, the first cell base station is in the time determining user terminal to be switched to the second community, the residence time of counting user terminal in the first community, and residence time is added in the historical information of user terminal, the second cell base station is according to the historical information of user terminal, judge whether user terminal has occurred in the first community unnecessary of short duration resident, if user terminal has occurred unnecessary of short duration resident in the first community, the second cell base station sends of short duration resident report to Optimized Service device, Optimized Service device utilizes of short duration resident report to be optimized processing to network system.Can accurately identify thus of short duration residently, avoid producing unnecessary report simultaneously, be conducive to realize the network optimization.
Preferably, the second cell base station 602 also, for receiving after the handover request that the first cell base station 601 sends, utilizes the historical information of user terminal, judges whether residence time is less than predetermined residence time threshold value; If judge, residence time is less than predetermined residence time threshold value, and whether the translational speed that further detects user terminal is less than threshold speed; If judge, the translational speed of user terminal is less than threshold speed, further judges resident whether be necessary of user terminal in the first community; If judge resident there is no need of user terminal in the first community, carry out the operation that sends of short duration resident report to Optimized Service device 603.
Preferably, the second cell base station 602 is also for receiving after the handover request that the first cell base station 601 sends, postpone predetermined time interval, then carry out the historical information of utilizing user terminal, judge whether residence time is less than the operation of predetermined residence time threshold value.
Preferably, whether the second cell base station 602 is also all greater than signal strength threshold for the signal strength signal intensity that judges the first community, the second community He tri-communities, and wherein the signal strength signal intensity of the first community, the second community He tri-communities is included in the historical information of user terminal; If the signal strength signal intensity of the first community, the second community He tri-communities is all greater than signal strength threshold, judge resident there is no need of user terminal in the first community.
Fig. 7 is the schematic diagram of an embodiment of the of short duration resident inspection optimization system of the present invention.Compared with embodiment illustrated in fig. 6, in the embodiment shown in fig. 7, also comprise the 3rd cell base station 701.Wherein:
Optimized Service device 603 is also for adding up the of short duration resident report number of times receiving within the scheduled time; By the 3rd cell base station 701, statistics Cong tri-communities within the described scheduled time are switched to total switching times of the first community; Judge whether of short duration resident report number of times and the ratio of total switching times are greater than predetermined decision threshold; If of short duration resident switching times and the ratio of total switching times are greater than the first predetermined decision threshold and/or total switching times is greater than the second decision threshold, system parameters is optimized to processing.
The 3rd cell base station 701, is switched to total switching times of the first community for adding up Cong tri-communities within the scope of the described scheduled time, and reports statistics to Optimized Service device.
Preferably, whether Optimized Service device 603 is also to cover cavity in order to make up for the covering object that judges the first community; If the covering object of the first community is to cover cavity in order to make up, reduce the base station transmitting power of the first community.
Preferably, Optimized Service device 603 is not also for being to cover when cavity in order to make up in the covering object of the first community, and instruction the 3rd cell base station 701 improves the switching individual character offset parameter with respect to the first community; Or instruction the 3rd cell base station 701 is not using the first community as switching target small area.
With three specific embodiments, present invention is described below.
Fig. 8 is the schematic diagram of of short duration resident phenomenon inspection optimization in Intra-LTE scene of the present invention.As shown in Figure 8, community A, B, adjacent area each other between C, and Dou Shi LTE community.User terminal is at the edge of community A, and community A triggers the switching of Liao Dao community B, has been switched to again community C afterwards a very short time.Community A, have X2 interface, and user terminal has GPS ability between B and C.
Step 1: community A has triggered the switching of user terminal Cong Zhe community to community B, and its switch reasons is wireless reason: " Handover Desirable for Radio Reasons ".
Step 2: community B is receiving after the handover request of community A about user terminal, the acceptance algorithm in the B of community determines that the carrying of this user terminal can all be accepted, and the switch reasons of community B recording user terminal.When user terminal is linked into after the B of community at random, the time point of community B recording user terminal access community B.After user terminal is switched to community B 1.5 seconds, community B side is received the measurement report of user terminal, determine user terminal to be switched to community C according to measurement report, community B finds that user terminal only has 1.5 seconds from access community to the time interval of triggering switching, be less than intra-LTE terminal threshold value thresholding 5 seconds at a slow speed, therefore in the presence information of the history information small area of user terminal A, increase switch reasons: " Handover Desirable for Radio Reasons ".In the presence information of the history information small area of user terminal B, increase the measurement report of user terminal.
Step 3: community C to reply after the cell-of-origin switching request acknowledgement message of switching one regular time interval within 2 seconds, start judgement, find that residence time only has 1.5 seconds, be less than intra-LTE terminal thresholding 5 seconds at a slow speed.Community need to obtain the translational speed of user terminal, community C recognizes this user terminal support GPS function according to the ability of user terminal, utilize user terminal information reciprocal process to obtain the translational speed of user terminal, the translational speed of user terminal is 3Km/h.Therefore this user terminal is the terminal of a low speed, and in history message in the measurement report of user terminal, and the signal strength signal intensity of community A, B, C is all higher than thresholding, judges that this user terminal belongs to unnecessary of short duration resident at community B resident.Community C is by the historical information of user terminal, finds that this user terminal Shi Cong community A is switched to community B, and the residence time of community A is higher than threshold value, and community C reports that to community A this user terminal is of short duration resident by X2 interface so.In of short duration resident report, the contents are as follows:
[1]. switching type (Handover Type): intra-LTE switches
[2]. the mark of cell-of-origin: the ECGI of community A
[3]. switch reasons: Handover Desirable for Radio Reasons
[4]. the mark of of short duration persistent district: the ECGI of community B
[5]. the mark of detected cells: the ECGI of community C
[6]. report time point
Step 4: community A receives the of short duration resident report of community C, stores this report.In the moment of configuration that reaches system, the of short duration resident report that processing receives, find to receive altogether 40 of short duration resident reports, the reason of its switching is all Handover Desirable for Radio Reasons, and Dou Shi community, the Target cell B switching.Within this time period, the RRM(Radio Resource Management of community A, RRM) module counts on to community C switching times and has 80 times, and the of short duration switching proportion therefore producing is 50%, exceed default thresholding 5%, therefore needed the adjustment of being correlated with.Community A has improved switching individual character skew OCN own and community B, and size is 2dB.
Fig. 9 is Inter-RAT(Radio Access Technology of the present invention, wireless access technology) schematic diagram of of short duration resident phenomenon inspection optimization in scene.As shown in Figure 9, community A, WCDMA(Wideband Code Division Multiple Access each other between C, Wideband Code Division Multiple Access (WCDMA)) community and adhere to different RNC(Radio Network Controller separately, radio network controller), and between RNC, there is no Iur interface, in addition community B ShiLTE community.User terminal is at the edge of community A, and community A has triggered the switching of user terminal to community B in advance because load is higher, be switched to again community C afterwards, and user terminal is a common R9 terminal of not supporting GPS ability a very short time.
Step 1: community A has triggered the switching of user terminal Cong Zhe community to community B, and its switch reasons is wireless reason: " Resource Optimisation Handover ".
Step 2: community B is receiving after the handover request of community A about user terminal, the acceptance algorithm in the B of community determines that the CS carrying of this user terminal is rejected, and the switch reasons of community B recording user terminal.When user terminal is linked into after the B of community at random, the time point of community B recording user terminal access community B.After user terminal is switched to community B 5 seconds, community B side is received the measurement report of user terminal, determine user terminal to be switched to community C according to measurement report, community B finds that user terminal only has 5 seconds from access community to the time interval of triggering switching, be less than intra-LTE terminal threshold value thresholding 12 seconds at a slow speed, therefore in the presence information of the history information small area of user terminal A, increase switch reasons: " Resource Optimisation Handover ".In the presence information of the history information small area of user terminal B, increase measurement report and the unaccepted beared information of user terminal.
Step 3: the RNC of community C to reply after the cell-of-origin switching request acknowledgement message of switching one regular time interval within 4 seconds, start judgement, find that residence time only has 5 seconds, be less than intra-LTE terminal thresholding 12 seconds at a slow speed.Community need to obtain the translational speed of user terminal, and community C recognizes according to the ability of user terminal the ability that it does not support GPS, therefore estimates that by base station the Doppler frequency-shift that receives signal estimates that this user terminal may be a low velocity user.Due to this user terminal be the signal strength signal intensity of measurement report small area A, B, C of user terminal in the terminal of a low speed and history message all higher than thresholding, judge that this user terminal belongs to unnecessary of short duration resident at community B resident.Community C is by the historical information of user terminal, finds that this user terminal Shi Cong community A is switched to community B, and the residence time of community A is higher than threshold value, and the RNC under the C of community sends to this report in Operation and Maintenance OAM by Itf-N interface so.In of short duration resident report, the contents are as follows:
[1]. switching type (Handover Type): UTRAN->LTE
[2]. the mark of cell-of-origin: the ECGI of community A
[3]. switch reasons: " Resource Optimisation Handover
[4]. the mark of of short duration persistent district: the ECGI of community B
[5]. the mark of detected cells: the ECGI of community C
[6]. report time point
Step 4:OAM receives the of short duration resident report of community C, stores this report.In the moment of configuration that reaches system, process the of short duration resident report receiving, to find to receive altogether 15 of short duration resident reports, the reason of its switching is all Resource Optimisation Handover, and Dou Shi community, the Target cell B switching.Within this time period, the RRM module of community A is reported to OAMDao community B switching times to have 30 times, and the of short duration switching proportion therefore producing is 50%, has exceeded default thresholding 5%, therefore needs the adjustment of being correlated with.The congestion avoidance algorithm that OAM arranges in the A of community is forbidden the Target cell using community B as load balancing.
Figure 10 is the schematic diagram of of short duration resident phenomenon inspection optimization in isomery scene of the present invention.As shown in figure 10, adjacent area and Dou Shi LTE community each other between community A, B, its small area A is grand (Macro) community, and community B is micro-(Pico) community.User terminal moves on Yi Tiao highway in cell coverage area, because the power setting of PICO community is improper, caused covering phenomenon, user terminal has been switched community B at the edge of community B by community A, has been switched to again community A afterwards a very short time.User terminal has GPS ability.
Step 1: community A has triggered the switching of user terminal Cong Zhe community to community B, and its switch reasons is wireless reason: " Handover Desirable for Radio Reasons ".
Step 2: community B is receiving after the handover request of community A about user terminal, the acceptance algorithm in the B of community determines that the carrying of this user terminal can all be accepted, and the switch reasons of community B recording user terminal.When user terminal is linked into after the B of community at random, the time point of community B recording user terminal access community B.After user terminal is switched to community B 1.5 seconds, community B side is received the measurement report of user terminal, determine user terminal to be switched to community A according to measurement report, community B finds that user terminal only has 1.5 seconds from access community to the time interval of triggering switching, be less than intra-LTE terminal threshold value thresholding 5 seconds at a slow speed, therefore in the presence information of the history information small area of user terminal A, increase switch reasons: " Handover Desirable for Radio Reasons ".In the presence information of the history information small area of user terminal B, increase the measurement report of user terminal.
Step 3: community A to reply after the cell-of-origin switching request acknowledgement message of switching one regular time interval within 2 seconds, start judgement, find that residence time only has 1.5 seconds, be less than intra-LTE terminal thresholding 5 seconds at a slow speed.Community need to obtain the translational speed of user terminal, community A supports the MDT function of R10 according to this user terminal of the ability discovery of user terminal, the translational speed of user terminal of having utilized user terminal information Procedure Acquisition, the translational speed of user terminal is 60Km/h.Therefore this user terminal is the terminal of a middling speed, and community A finds that its residence time is still lower than middling speed terminal threshold value.In addition in history message in the measurement report of user terminal, community A, the signal strength signal intensity of B is all higher than thresholding, judges that this user terminal belongs to unnecessary of short duration resident at community B resident.Community A is by the historical information of user terminal, and the transfer sequence of finding this user terminal is to be switched to B from A to switch back to A again, and community A reports that to OAM this user terminal is of short duration resident by Itf-N interface so.In of short duration resident report, the contents are as follows:
[1]. switching type (Handover Type): intra-LTE switches
[2]. the mark of cell-of-origin: the ECGI of community A
[3]. switch reasons: Handover Desirable for Radio Reasons
[4]. the mark of of short duration persistent district: the ECGI of community B
[5]. the mark of detected cells: the ECGI of community A
[6]. report time point
Step 4:OAM receives the of short duration resident report of community A, stores this report.In the moment of configuration that reaches system, the of short duration resident report that processing receives, find to receive altogether 30 of short duration resident reports, the reason of its switching is all Handover Desirable for Radio Reasons, and Dou Shi community, the Target cell B switching.Within this time period, the RRM module of community A counts on to community C switching times and has 40 times, and the of short duration switching proportion therefore producing is 75%, has exceeded default thresholding 5%, and because community B is a PICO community, therefore OAM indicating cell reduces transmitting power.
By implementing the present invention, can obtain following beneficial effect:
This patent has proposed a kind of of short duration resident inspection optimization scheme, with respect to prior art, this programme can better be distinguished and occur of short duration resident reason, and detects this of short duration resident phenomenon and whether belong to inessential, and Optimized Service device completes and optimizes and revises according to of short duration resident report.This patent is less to the amendment of existing protocol process simultaneously, has facilitated the equipment realization of equipment manufacturers and the enforcement of operator, and from standardization angle, this is for being accepted also relatively easy by the numerous representative of 3GPP.Therefore, can be used as one of candidate scheme of mobile robustness self-optimizing in the SON of one of current focus of 3GPP and propose to the relevant standardization body of 3GPP SON, thereby can make up in SON standard corresponding blank.
In addition, what deserves to be explained is, because the scheme in the present invention not only goes in the mobile robustness self-optimizing of SON scope, also go in LTE and follow-up evolvement network (as LTE+) thereof during traditional mobile robustness manually optimizes.So even if can not be adopted by standard, the scheme that also can be used as a kind of simple and easy to do mobility parameters for LTE and follow-up evolvement network (as LTE+) thereof coordination is implemented.
One of ordinary skill in the art will appreciate that all or part of step that realizes above-described embodiment can complete by hardware, also can carry out the hardware that instruction is relevant by program completes, described program can be stored in a kind of computer-readable recording medium, the above-mentioned storage medium of mentioning can be read-only memory, disk or CD etc.
Description of the invention provides for example with for the purpose of describing, and is not exhaustively or limit the invention to disclosed form.Many modifications and variations are obvious for the ordinary skill in the art.Selecting and describing embodiment is for better explanation principle of the present invention and practical application, thereby and makes those of ordinary skill in the art can understand the present invention's design to be suitable for the various embodiment with various amendments of special-purpose.
Claims (14)
1. an of short duration resident inspection optimization method, is characterized in that, comprising:
The first cell base station is in the time determining user terminal to be switched to the second community, the residence time of counting user terminal in the first community, and residence time is added in the historical information of user terminal, wherein residence time is that user terminal Cong tri-communities are accessed behind the first community, determined user terminal to be switched to the time interval between the second community to the first cell base station;
The second cell base station is according to the historical information of user terminal, judges whether user terminal has occurred in the first community unnecessary of short duration resident;
If user terminal has occurred unnecessary of short duration resident in the first community, the second cell base station sends of short duration resident report to Optimized Service device;
Optimized Service device utilizes of short duration resident report to be optimized processing to network system.
2. method according to claim 1, is characterized in that:
The second cell base station, according to the historical information of user terminal, judges whether user terminal unnecessary of short duration resident step has occurred in the first community and comprised:
The second cell base station is receiving after the handover request of the first cell base station transmission, utilizes the historical information of user terminal, judges whether residence time is less than predetermined residence time threshold value;
If judge, residence time is less than predetermined residence time threshold value, and whether the translational speed that the second cell base station further detects user terminal is less than threshold speed;
If judge, the translational speed of user terminal is less than threshold speed, and the second cell base station further judges resident whether be necessary of user terminal in the first community;
If the second cell base station judges resident there is no need of user terminal in the first community, the second cell base station is carried out the step that sends of short duration resident report to Optimized Service device.
3. method according to claim 2, is characterized in that:
The second cell base station is receiving after the handover request of the first cell base station transmission, also comprises:
The second cell base station postpones predetermined time interval;
Then carry out the historical information of utilizing user terminal, judge whether residence time is less than the step of predetermined residence time threshold value.
4. it is characterized in that according to the method in claim 2 or 3:
The second cell base station further judges that the resident step that whether be necessary of user terminal in the first community comprises:
The second cell base station further judges whether the signal strength signal intensity of the first community, the second community He tri-communities is all greater than signal strength threshold, and wherein the signal strength signal intensity of the first community, the second community He tri-communities is included in the historical information of user terminal;
If the signal strength signal intensity of the first community, the second community He tri-communities is all greater than signal strength threshold, the second cell base station judges resident there is no need of user terminal in the first community.
5. according to the method described in any one in claim 1-3, it is characterized in that:
The step that Optimized Service device utilizes of short duration resident report to be optimized processing to network system comprises:
Optimized Service device is added up the of short duration resident report number of times receiving within the scheduled time;
Optimized Service device is by the 3rd cell base station, and statistics Cong tri-communities within the described scheduled time are switched to total switching times of the first community;
Optimized Service device judges whether of short duration resident report number of times and the ratio of total switching times are greater than predetermined decision threshold;
If of short duration resident switching times is greater than predetermined decision threshold with the ratio of total switching times, Optimized Service device is optimized processing to system parameters.
6. method according to claim 5, is characterized in that:
The step that Optimized Service device is optimized processing to system parameters comprises:
Optimized Service device judges whether the covering object of the first community is to cover cavity in order to make up;
If the covering object of the first community is to cover cavity in order to make up, Optimized Service device reduces the base station transmitting power of the first community.
7. method according to claim 6, is characterized in that:
If the covering object of the first community is not to cover cavity in order to make up, Optimized Service device instruction the 3rd cell base station improves the switching individual character offset parameter with respect to the first community; Or instruction the 3rd cell base station is not using the first community as switching target small area.
8. an of short duration resident inspection optimization system, is characterized in that, comprising:
The first cell base station, for in the time determining user terminal to be switched to the second community, the residence time of counting user terminal in the first community, and residence time is added in the historical information of user terminal, wherein residence time is that user terminal Cong tri-communities are accessed behind the first community, determined user terminal to be switched to the time interval between the second community to the first cell base station;
The second cell base station, be used for according to the historical information of user terminal, judge whether user terminal has occurred in the first community unnecessary of short duration resident, unnecessary of short duration resident if user terminal has occurred in the first community, send of short duration resident report to Optimized Service device;
Optimized Service device, for utilizing of short duration resident report to be optimized processing to network system.
9. system according to claim 8, is characterized in that:
The second cell base station also, for receiving after the handover request of the first cell base station transmission, utilizes the historical information of user terminal, judges whether residence time is less than predetermined residence time threshold value; If judge, residence time is less than predetermined residence time threshold value, and whether the translational speed that further detects user terminal is less than threshold speed; If judge, the translational speed of user terminal is less than threshold speed, further judges resident whether be necessary of user terminal in the first community; If judge resident there is no need of user terminal in the first community, carry out the operation that sends of short duration resident report to Optimized Service device.
10. system according to claim 9, is characterized in that:
The second cell base station also, for receiving after the handover request of the first cell base station transmission, postpones predetermined time interval, then carries out the historical information of utilizing user terminal, judges whether residence time is less than the operation of predetermined residence time threshold value.
11. according to the system described in claim 9 or 10, it is characterized in that:
Whether the second cell base station is also all greater than signal strength threshold for the signal strength signal intensity that judges the first community, the second community He tri-communities, and wherein the signal strength signal intensity of the first community, the second community He tri-communities is included in the historical information of user terminal; If the signal strength signal intensity of the first community, the second community He tri-communities is all greater than signal strength threshold, judge resident there is no need of user terminal in the first community.
System in 12. according to Claim 8-10 described in any one, is characterized in that, system also comprises the 3rd cell base station, wherein:
Optimized Service device is also for adding up the of short duration resident report number of times receiving within the scheduled time; By the 3rd cell base station, statistics Cong tri-communities within the described scheduled time are switched to total switching times of the first community; Judge whether of short duration resident report number of times and the ratio of total switching times are greater than predetermined decision threshold; If of short duration resident switching times and the ratio of total switching times are greater than the first predetermined decision threshold and/or total switching times is greater than the second decision threshold, system parameters is optimized to processing;
The 3rd cell base station, is switched to total switching times of the first community for adding up Cong tri-communities within the scope of the described scheduled time, and reports statistics to Optimized Service device.
13. systems according to claim 12, is characterized in that:
Whether Optimized Service device is also to cover cavity in order to make up for the covering object that judges the first community; If the covering object of the first community is to cover cavity in order to make up, reduce the base station transmitting power of the first community.
14. systems according to claim 13, is characterized in that:
Optimized Service device is not also for being to cover when cavity in order to make up in the covering object of the first community, and instruction the 3rd cell base station improves the switching individual character offset parameter with respect to the first community; Or instruction the 3rd cell base station is not using the first community as switching target small area.
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