CN102026232A - Cooperative measurement and switching setting optimization method among multiple cells in mobile communication network - Google Patents
Cooperative measurement and switching setting optimization method among multiple cells in mobile communication network Download PDFInfo
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Abstract
The invention provides a cooperative measurement and switching setting optimization method among multiple cells in a mobile communication network. The cooperative measurement and switching setting optimization method requires that the multiple cells positioned on a network side cooperatively control a mobile terminal to complete radio link measurement in specified cell coverage areas, and the specified cell coverage areas are target areas of the multiple cells trying to carry out intercell switching optimization. An intercell cooperative measurement mechanism enables a source cell starting the measurement to acquire a measuring result of the mobile terminal from other cells and assists the source cell to detect the necessity of switching and the reasonability of mobile parameter setting, and if the source cell discovers unnecessary switching exists among cooperative cells or the mobile parameter setting is unreasonable, the source cell can notify information to the cooperative cells so as to trigger the optimization process of the mobile parameter setting; and finally, the multiple cooperative cells can prevent unreasonable switching by modifying parameters, thereby achieving the optimization of the integral mobile function of the mobile communication network and realizing the enhancement of the property and the capacity of a mobile communication system.
Description
Technical field
The present invention relates to moving communicating field, particularly a kind of Radio Link based on multi-cell cooperating measures and the optimization method that is provided with is switched in many minizones.
Background technology
System of broadband wireless communication, as 3G (Third Generation) Moblie (being called for short 3G), 3GPP Long Term Evolution (Long-Term Evolution, hereinafter to be referred as LTE) and the 4th third-generation mobile communication system (being called for short 4G), be beehive net mode, for portable terminal provides seamless mobile communication service based on many sub-districts.
The minizone is switched and to be meant that portable terminal finishes the migration that is connected from the Radio Link of cell-of-origin and Target cell under the control of wireless access network.Switching is the basic fundamental means that mobile communication system guarantees seamless mobile communication service.But, finish switching and need consume a large amount of Internet resources, if and the wireless link signals power before and after switching or the quality reception requirement that can not satisfy portable terminal, the quality level of wireless traffic will directly be influenced, produce service disconnection, even cause the user terminal can't access network, cause radio link failure (Radio Link Failure is hereinafter to be referred as RLF).
The base station of network side (particularly source base station) can be by obtaining the latter's measurement report to the measurement of portable terminal configuration, and then understand the current service cell that portable terminal can receive and the signal power and the quality of other sub-district.Source base station can judge in view of the above whether portable terminal is in the overlapping region of current service cell and other sub-district, and whether corresponding Radio Link situation meets the requirement of switching, and then correctly finish the minizone switching, also can avoid unnecessary switching simultaneously and reduce the probability that produces mobile terminal side RLF.
The prior art relevant with the application mainly comprises following three lists of references:
[1]TS?36.300，“(E-UTRAN)；Overall?description；Stage?2”，3GPP.
[2]R3-102058，“Rapid?HO”，RAN3#69，Huawei.
[3]R3-100384，“Finalization?of?too?early?handovers?by?UE?measurements”，RAN3#66bis，Alcatel-Lucent.
Since the complexity of wireless propagation environment, the otherness that becomes when the Radio Link coverage condition of overlapping region, minizone certainly exists.It is unusual that these complicated covering scene may cause the switching behavior of mobile communication system to produce, and switches (Ping-pong Handover), handoff failure (Handover Failure) as table tennis, even problem such as RLF.Document [1] has defined three kinds of problem handoff scenario:
-switch too early (Too Early Handover);
-spending evening switches (Too Late Handover);
-wrong cell is switched (Handover to Wrong Cell).
Document [1] is pointed out, under these three kinds of problem handoff scenario, portable terminal can detect RLF, and when setting up thereafter with being connected of base station, report the Radio Link measurement result relevant, make network side whether can detect the current wireless connection failure owing to aforementioned three kinds of problems cause with radio link failure.Subsequently, can hold consultation to relevant handoff parameter and optimize in relevant base station by negotiation mechanism between the base station, finally eliminate above-mentioned three kinds of problem handoff scenario.But document [1] is not considered some other scene, although for example switching has obtained success, these switchings may not be necessary.If can avoid unnecessary switching, then can when providing the service of equal quality, reduce the consumption of Internet resources for portable terminal, realize the lifting of overall performance of network and capacity.
The problem handoff scenario that document [2] has proposed a kind of " switching fast " (Rapid Handover), as shown in Figure 1.In this scene, 3 neighbor cells exist overlapping covered.When portable terminal during along certain track high-speed mobile, very short at the residence time of sub-district B, therefore will produce the quick continuous switching of sub-district A to sub-district B, sub-district B to sub-district C.When portable terminal regional between twice switching, under given conditions, the actual wireless communication environments may allow portable terminal to receive the wireless signal of sub-district A and sub-district C simultaneously and set up two-way the connection.In this case, the above-mentioned switching continuously fast is unnecessary, also should avoid.Document [2] has proposed to detect this by sub-district B and " has switched " problem fast, and the cell-of-origin A of the notice switching first time; Subsequently, cell-of-origin A can select and the Target cell C of switching for the second time carries out the negotiation that moving parameter is provided with, and manages to eliminate " switching fast ".Yet, document [2] also reckons without, when the Target cell C of cell-of-origin A that switches for the first time and switching does not for the second time have enough information, can't know that promptly portable terminal during the wireless link condition in the overlapping region, just can't correctly judge whether to avoid " switching fast " and consult the setting of corresponding mobile parameter between twice switching.
A kind of scene of similarly " switching fast " also has been discussed in document [3], and promptly the neighbor cell overlay area in network is interlaced, thereby when forming the scene of so-called " area covered ", may form " covering isolated island " (Coverage Island).When portable terminal moves and when this " isolated island ", just may produce " switching fast " along certain track, as shown in Figure 2.Document [3] has provided a kind of method, make that the cell-of-origin A that initiates " switching fast " can be after the problem of learning produces, can before switch taking place, require portable terminal to carry out periodic measurement within a certain period of time, and with the Target cell B of this this switching of advisory; Even switch once more, move to sub-district C as portable terminal from sub-district B, then by sub-district B notifying cell C relevant information, guarantee that with this above-mentioned periodic measurement configuration still can keep the timer expiry until appointment.After measurement is finished, portable terminal reports current service cell (for example sub-district C) with measurement result, and the handover relevant information when entering this sub-district by current service cell according to this portable terminal again returns to portable terminal Serving cell (for example sub-district B) before with measurement result.So analogize, final measurement will be returned to the initiator cell-of-origin A of this periodic measurement.This cell-of-origin A is by the analysis to measure result, can make relevant " switching fast " correct judgement and and sub-district B or C carry out the negotiation of moving parameter setting.The shortcoming of said method is:
-except that sub-district that initiate to measure instruction, the operation that other follow-up related cell can not be made amendment or stop the periodic measurement that has been configured, this has seriously limited the management of other sub-district to the portable terminal wireless connections;
-because the time and the position span of this periodic measurement is big, need each related cell to prolong memory time to the portable terminal relevant configuration information of having switched away from own coverage, thereby increased resource take and handle load;
The more resources that needs-portable terminal writes down the configuration information and the measurement result of this periodic measurement;
RLF may take place in-portable terminal in the time of this periodic measurement, cause measuring accordingly and report operation to finish.
To sum up, be provided with in the optimisation technique at existing moving parameter commonly used, for want of multi-cell cooperating obtains wireless measurement result's means, and it is unreasonable to cause moving parameter to be provided with, and then causes the unnecessary problem of switching behavior generation in the mobile communication system.
Therefore, the present invention has designed in a kind of mobile communication system the cooperation of many minizones and has measured and switch the method that optimization is set, efficiently solve above-mentioned technical problem, improved and judged the accuracy and the reliability of consulting moving parameter between switching problem scene and base station, thereby improved the stability that wireless communication system is supported locomotive function.
Summary of the invention
The present invention proposes in the mobile communication system cooperation of many minizones measures and switches a kind of method that optimization is set.A plurality of cell coordinations control portable terminals of this method requirement network side are finished at the Radio Link of its designated cell overlay area and are measured, and this zone is the target area that the minizone handover optimization is attempted to carry out in a plurality of sub-districts.The minizone cooperation measurement mechanism that the present invention proposes, feasible cell-of-origin of initiating to measure can obtain the measurement result of portable terminal from other sub-district, helps the cell-of-origin to detect the necessity of switching and the reasonability that moving parameter is provided with.If it is unreasonable that the cell-of-origin finds to exist unnecessary switching or moving parameter to be provided with between cooperation cell, it can trigger the process that moving parameter is provided with optimization thus with this information notice cooperation cell.Finally, a plurality of cooperation cell can be revised parameter, avoid irrational switching, thereby the whole locomotive function that reaches network is optimized, and realize the lifting of performance of mobile communication system and capacity.
In the method that the present invention proposes, can measure the information that the sub-district notifies the relevant portable terminal of cooperation cell to measure task in handoff procedure by initiation, also can be after switching to cooperation cell by portable terminal, the information of the relevant measurement task of proactive notification cooperation cell.The effect that above-mentioned two kinds of realization approach can reach is identical.
With the double example (scene that can have continuous several times to switch in the real network) that switches to main performing step of the present invention is described below, as shown in Figure 3:
(1) sub-district is provided for judging some timers of the normal residence time lower limit of portable terminal, corresponds respectively to different translational speed scopes.The covering radius Radius of the classification of timer and value and current area
CellAnd portable terminal translational speed UE
SpeedThe sorting technique that is adopted is relevant.
For example, in the LTE system, UE
SpeedBe divided three classes: low speed moves, middling speed moves and high-speed mobile.Therefore, normal residence time lower limit timer T can be set respectively
Low_speed_stayedCorresponding low speed portable terminal, T
Medium_speed_stayedCorresponding medium speed's portable terminal and T
High_speed_stayedCorresponding high speed mobile terminal;
(2) in order to realize detection to switching problem, the sub-district is tackled following scenario-related information and carried out record: the scope when the cell detection portable terminal that it was once served to certain enters into earlier this sub-district by switching under of short durationly switches to next sub-district again after resident.The residence time T that should comprise portable terminal in the information of record at least
Ue_stayed, translational speed UE
Speed, portable terminal enters Target cell that the switching historical information, portable terminal of the source Serving cell before this sub-district switch etc.
As cell detection to the portable terminal that takes place to switch fast continuously, with utilization record portable terminal translational speed UE
SpeedInformation is carried out scene analysis.For example, compare portable terminal residence time T in the sub-district
Ue_stayedSet point with the normal residence time lower limit of the pairing portable terminal of translational speed type timer, if the former is less than the latter, then can judge handover event has fast taken place between the neighbor cell that relates in this handoff procedure continuously, and can determine that current area is the middle sub-district in the continuous fast handover procedures;
(3) after this, at the neighbor cell that takes place to switch fast once more as the handover source sub-district when it sends handover preparation request message, sub-district can provide the measurement configuration information at portable terminal in the middle of this in the handoff request acknowledgment message of returning.Measurement can be a periodic measurement, also can be based on the periodic measurement of Event triggered etc.
In the measurement configuration information, can include but not limited to following content:
-measuring object: mainly show the neighbor cell of deciding frequency range, be designated as cellList.Middle sub-district should require portable terminal at least several relevant sub-districts of continuous fast handover procedures to be measured;
-trigger condition: can threshold value be set at the measurement result of some measuring objects, measure, be used for periodic measurement process based on Event triggered so that portable terminal can start this when condition satisfies.With the LTE system is example, and the homologous ray A1-A5 of its normalized definition, different system B1-B2 incident can be used as the condition of measuring that triggers.This measurement parameter can be made as option, when configure trigger condition not represents that then portable terminal should start the measurement task immediately;
-measurement result: the measurement result type of configuration portable terminal is designated as measResult.With the LTE system is example, can comprise Reference Signal Received Power (Reference Signal Receiving Power is hereinafter to be referred as RSRP) and Reference Signal Received Quality (Reference Signal Receiving Quality is hereinafter to be referred as RSRQ);
-measuring period: the configuration portable terminal carries out the time interval of periodic measurement, is designated as measPeriod;
-to measure the duration: the configuration portable terminal carries out the total time length of periodic measurement, is designated as measDuration.Or adopt the mode of measuring total degree to express, be designated as measAmount;
-measurement result postpones to report at interval: the configuration portable terminal postpones reporting measurement result's the time interval, is designated as T
DelayPortable terminal need stores it heretofore interbody spacer arrive and just to report this result.Because measurement result reports and needs the regular hour expense, so this setting is applicable to that, sub-district urgent when switching time may not have time enough to obtain the scene of the reporting message of portable terminal.This measurement parameter can be made as option.If the no this item configuration, then portable terminal can not produce T according to normal reporting measurement result measuring period
DelayOvertime incident;
-velocity factor: portable terminal can utilize velocity factor that measuring period, measurement duration and measurement result are postponed to report at interval and handle (weighting of for example multiplying each other), and get the result as measuring configuration according to the translational speed of self, is designated as S.The UE of velocity factor and portable terminal translational speed
SpeedSorting technique is corresponding.With the LTE system is example, and velocity factor S can be set
MediumAnd S
High, corresponding middling speed of difference and high-speed mobile classification, low speed moves then can corresponding constant 1.
According to information such as the translational speed of the coverage (radius of society) of current area, terminal and the normal minimum residence times of portable terminal, can be to measuring period, measure the duration (or measuring total degree) and measurement result postpones report the interval to be optimized.Be without loss of generality, the length that can be set measuring period guarantees that the measurement result of portable terminal is abundant, and feasible coverage condition by statistical method analysis wireless link signals becomes possibility; It is longer that the time interval of measuring more double quick switching of duration and for example can be set so that the measurement that portable terminal is done can twice switching of complete embodiment portable terminal between wireless link signals situation of change on the movement locus;
(4) above-mentioned measurement configuration information will be carried in the handover source sub-district in the switching command that sends to portable terminal.After portable terminal receives measurement configuration information, finish corresponding processing procedure, also adjust measuring period, measurement duration and measurement result accordingly comprising the selected velocity factor that is suitable for and postpone to report at interval.Then, portable terminal is carried out switching command, sub-district in the middle of being connected to.The sub-district becomes the current service cell of portable terminal in the middle of this moment.Meanwhile, the measurement action that the sub-district was disposed in the middle of portable terminal started;
(5) during the resident middle sub-district of portable terminal, following adjustment is made in the measurement configuration that middle sub-district is carried out before can taking place aforementioned switching:
-increase or the deletion measuring object;
Other content in the configuration is measured in-adjustment;
-postpone to report interval T in measurement result
DelayStop this measurement before not overtime.
Be adjusted into example with the configuration of the measurement in the LTE system, can reshuffle signaling procedure by the air-link resources between sub-district and portable terminal and finish;
(6) postpone to report interval T according to during the resident middle sub-district of portable terminal whether measurement result taking place
DelayOvertime incident is divided into following two kinds of situations:
(6.1) T has taken place
DelayOvertime incident, carry out according to the following steps:
(6.1.1) portable terminal stops to measure.Implementation method can be that this measurement of portable terminal proactive notification current service cell is finished, and its measurement result of storing has to be reported; Or the configuration information that writes down by inside of middle sub-district, find that this portable terminal measurement result postpones to report interval T
DelayOvertime, expression is measured and is finished, and can require the mobile terminal reporting measurement result.Two kinds of effects that realize approach are identical.Portable terminal is finished measurement result measResult by measurement report message and is reported, and wherein can comprise the value of the velocity factor that portable terminal is selected, so that the sub-district is analyzed more accurately;
(6.1.2) receive the measurement result of mobile terminal reporting after, this portable terminal is analyzed on its motion track top or all continuously fast switch the metrical information of overlapping region, the minizone wireless signal of related cell in middle sub-district.If middle sub-district is thought after analyzing above-mentioned data, can guarantee also that even do not switch portable terminal keeps and the wireless connections of these sub-districts, then the handoff parameter between sub-district and related cell is provided with existing problems in the middle of the decidable, has caused unnecessary " switching fast " to take place.Correspondingly, the optimization range that moving parameter is provided with will be assessed in middle sub-district;
The problem existence " is switched " fast by handover report message informing neighbor cell in the sub-district (6.1.3), and can provide measurement result so that the neighbor cell analysis.Subsequently, the minizone can start to move renewal process is set, and consults the moving parameter setting respectively and finishes optimization work, eliminates " switching fast " problem;
(6.2) T does not take place
DelayOvertime incident, carry out according to the following steps:
(6.2.1) postpone to report interval T in measurement result
DelayBefore not overtime, middle sub-district may need aforementioned portable terminal is switched to Target cell, then sends handover preparation request to Target cell.Subsequently, middle sub-district receives after Target cell returns handoff request acknowledgment message, sends switching command to portable terminal.Portable terminal is carried out to switch and is connected to Target cell, and stops the cell-of-origin when finishing switching, the measurement action that promptly middle sub-district is disposed.At this moment, Target cell becomes the current service cell of portable terminal.For Target cell, have following two kinds of possible approach to obtain not reporting measurement result's information of portable terminal:
● approach one: middle sub-district informs that this portable terminal of Target cell still has the measurement result that does not report in the handover preparation request order;
● approach two: portable terminal still has the measurement result that does not report by handoff completion message notification target sub-district after finishing switching;
(6.2.2) Target cell learns that portable terminal still has the measurement result that does not report, and then after portable terminal is finished switching, as the new Serving cell of this terminal, requires the mobile terminal reporting measurement result by end message inquiry signaling procedure:
1. new Serving cell sends the end message inquiry request message to portable terminal, requires the terminal to report measurement result;
2. portable terminal sends the end message response message, has wherein comprised measurement result.Measurement result should comprise the value of the selected velocity factor of portable terminal, so that the sub-district is analyzed more accurately;
After (6.2.3) Target cell obtains measurement result,, indicate the type not reporting measurement result of aforementioned portable terminal for this reason to the cell-of-origin (sub-district promptly) at place before this portable terminal transmission handover report message, and measurement result incidentally;
The sub-district receives handover report (6.2.4), and after extracting measurement result, analyzes and switch the radio signal quality of related cell in the overlapping region, minizone continuously fast.If middle sub-district is judged, can not guarantee that still portable terminal keeps and the wireless connections of these sub-districts even do not switch, then decidable " switching fast " problem exists, and the optimization range of assessment moving parameter setting.Middle sub-district sends handover report message to the cell-of-origin of switching for the first time, and " switching fast " problem of having informed takes place, and the portability measurement result is for the relevant Radio Link situation of its analysis and evaluation;
(6.2.5) cell-of-origin (sub-district A) of switching for the first time or the Target cell (sub-district B) that switches for the first time all can start moving parameter renewal process is set, consult the moving parameter setting in twos and finish optimization work in three related minizones, eliminate " switching fast " problem.So far, the step of branch two is finished.The sub-district can enter the switching problem testing process of a new round;
(7) so far, this switching problem testing process is finished.The sub-district can enter new round process.
Further, the negotiation that the minizone moving parameter is provided with can be distinguished ground applicationization parameter at different moving velocity of terminal classification.
Further, only be illustrated more than with the double example that switches to fast.In addition, following two kinds of situations also may appear in the real network:
1. same portable terminal continuous several times (more than twice) between a plurality of sub-districts is switched fast:
2. double switching takes place in many portable terminals simultaneously between two or more sub-districts.
Method provided by the invention still is suitable for above-mentioned two kinds of situations.For example, the quick switching of same portable terminal continuous several times (more than twice) can be decomposed on time domain as a basic processing unit by every double quick switching.When a plurality of portable terminals between two or more sub-districts double switching take place simultaneously, provide the cooperation measurement and the switching of the related cell of handed over service optimizing process to be set, the process that is independently, can walks abreast and carry out for each portable terminal.In the case, though macroscopic view goes up the corresponding thereupon increase of sub-district number that participates in switching cooperation, because of each collaborative process process is finished in different sub-district pairings, so can not cause single subdistrict itself to handle the significantly increase of complexity.
Further, method proposed by the invention does not limit the cooperation measurement of many minizones or switches the number of times that optimizing process is set.Simultaneously, method proposed by the invention does not limit the quantity of being responsible for carrying out the portable terminal of measuring yet, and the sub-district can specify one or more portable terminals to carry out cooperation measurement task.
Further, the cooperation of many minizones is measured and is switched optimization method is set in the mobile communication system proposed by the invention, does not limit cooperation cell and whether belongs to different base stations.When the cooperation cell that communicates when needs belongs to same base station, the then aforementioned interaction message of mentioning will transmit with the inside of base station means of signaling, but the information content of wherein carrying is with described in the invention consistent.
Further, method proposed by the invention also goes for the interval situation switched fast continuously of taking place of double small, promptly for the first time the handover source sub-district and for the second time switching target small area be same sub-district.This scene particularly can be comparatively common in the actual deployment of heterogeneous wireless network at next generation wireless network.With the LTE system is example, as shown in Figure 4, when a picocell (Picocell) is positioned at the coverage of a macrocell, when then portable terminal is along the direction high-speed mobile shown in the figure, may cause, again to twice " switching fast " of macrocell from macrocell to picocell.After adopting method of the present invention to optimize, can avoid this twice " to switch fast ".
To sum up, basic characteristics of the present invention and advantage are:
-by being provided for judging the timer of the normal residence time lower limit of portable terminal for the sub-district, and corresponding different translational speed scopes respectively, the accuracy that switching problem detects improved;
-by the cooperation of minizone, the handover source sub-district can obtain the portable terminal measurement result from switching target small area.This measurement result can reflect mobile terminal from enter into leave in the middle of the process of sub-district, the wireless signal situation on the motion track.Can this can be avoided because of not having enough Radio Link metrical informations (being the Radio Link situation in the zone of portable terminal between twice switching), can't make to avoid the correct judgement and the corresponding mobile parameter of " switching fast " that negotiation is set.
-configuration portable terminal postpones reporting measurement result's the time interval, and it is urgent to make that measurement can be applicable to when switching time, and the sub-district may not have time enough to obtain the situation of the reporting message of portable terminal.
-portable terminal can utilize velocity factor that measuring period, measurement duration and measurement result are postponed to report at interval and handle according to self translational speed, makes self can adjust frequency and total duration of measurement according to speed speed situation adaptively.For example:
● when the portable terminal translational speed was 10 meter per seconds, be 1 second measuring period, and measuring the duration is 30 seconds, and the velocity factor value is 1.Then the adjacent measurement points spacing is 10 meters, and it is 30 points that overall measurement is counted, and corresponding total displacement is 300 meters;
● when the portable terminal translational speed is 20 meter per seconds, access speed factor values 0.5, then
-weighted measurement cycle=1 * 0.5=1.5 (second);
-weighted measurement duration=30 * 0.5=15 (second);
After-weighting was adjusted, the adjacent measurement points spacing still remained 10 meters, overall measurement count also remain 30 constant.This measurement that has just guaranteed that portable terminal is done can intactly, as one man embody the wireless link signals situation of change on the movement locus between twice switching of portable terminal;
-handover source sub-district is to measurement that portable terminal carried out configuration, and after can not influencing portable terminal and moving to other sub-district, the required follow-up measurement configuration of carrying out in other sub-district promptly can not limit the management of other sub-district to these portable terminal wireless connections.
-this method is to propose in the scene that double quick switching takes place and set forth, but also can easily this thought be generalized in the scene of repeatedly switching fast.
Description of drawings
Fig. 1: " switching fast " problem scenes of three minizones that document [2] provides;
Fig. 2: " covering isolated island " problem scenes example that document [3] provides;
Fig. 3: the minizone cooperation is measured and is switched the optimization method flow chart is set;
Fig. 4: LTE heterogeneous wireless network configuration diagram;
Fig. 5: LTE SNA schematic diagram;
Fig. 6: switch schematic diagram between neighbor cell;
Fig. 7: embodiment schematic flow sheet;
Fig. 8: moving parameter is provided with the optimization result schematic diagram.
Embodiment
General mobile communication system network framework comprises core net, wireless access network and three parts of portable terminal.A plurality of sub-districts can be controlled in the base station, and there is certain overlapping region usually in the coverage of neighbor cell.Neighbor cell can be the co-frequency cell of same wireless access technology, also can be alien-frequency district, can also be the sub-district of different access technologies.The base station can be controlled portable terminal and switches in the minizone that belongs to identical or different base station; Portable terminal can be in cell coverage area or in the neighbor cell overlapping region and one or more base station communications, and the cell downlink signal is carried out the measurement of signal received power or quality.
Be example with the LTE system below, a specific embodiment of the present invention is described.
The wireless access network of LTE system is made up of the sub-district of base station and base stations control, can carry out interacting message by X2 interface or S1 interface between the base station, as shown in Figure 5.Fig. 6 has provided the typical scene of a switching, and wherein sub-district A, sub-district B and sub-district C are neighbor cells, belong to different base stations respectively.The motion track of portable terminal X and can switch at the cell coverage area intersection shown in Fig. 5 cathetus direction of arrow, i.e. position A that " * " indicated among the figure and position B.Below be the processing procedure of present embodiment, as shown in Figure 7:
Step 101: sub-district A makes handover decisions according to the wireless connections situation of existing handoff parameter configuration and portable terminal X, prepares terminal X is switched to sub-district B;
Step 102: sub-district A sends handover preparation request message to sub-district B;
Step 103: the handover preparation request of B acceptance area, sub-district A, and select portable terminal X is measured configuration.Suppose that this is measured as periodic measurement, its parameter is provided with as follows:
-measuring object: neighbor cell list cellList comprises sub-district A, sub-district B and sub-district C;
-trigger condition: do not have (promptly requiring portable terminal to trigger the measurement task at once);
-measurement result: measurement result measResult type configuration is reference signal receiving intensity (RSRP);
-measuring period: periodic measurement time interval measPeriod value is 1 second (1s);
-to measure the duration: overall measurement time span measDuration value is 30s;
-measurement result postpones to report at interval: postpone to report time interval T
DelayValue is 30s;
-velocity factor: velocity factor S
MediumValue is 0.5, S
HighValue is 0.25;
Step 104: sub-district B returns handoff request acknowledgment message to sub-district A, comprising the measurement configuration information to portable terminal X;
Step 105: sub-district A prepares to extract the measurement configuration information of sub-district B to portable terminal X the response message from the switching that receives, and sends to portable terminal X by switching command message;
Step 106: after portable terminal X received measurement configuration information, according to self translational speed, the selection velocity factor was S
Medium, and it is as follows that measuring period, measurement duration and measurement result are postponed to report the interval to adjust:
Adjust back value=sub-district B Configuration Values * velocity factor S
MediumPortable terminal X adjusts radio port, is connected to switching target small area B.
Step 107 hypothesis handover success, portable terminal X finishes response message by switching and informs that sub-district B switches and finish, and starts the periodic measurement that is disposed simultaneously;
Step 108: sub-district B is behind 20s, and according to existing handoff parameter configuration, discovery need switch to portable terminal X sub-district C.Sub-district B makes handover decisions;
Step 109: sub-district B sends handover preparation request message to sub-district C, informs that this portable terminal of Target cell still has the measurement result (being the approach one of abovementioned steps (6.2.1)) that does not report;
Step 110: sub-district C returns handoff request acknowledgment message to sub-district B, and expression can be switched;
Step 111: sub-district B sends switching command message to portable terminal X, and portable terminal X adjusts radio port, is connected to switching target small area C;
Step 112: suppose handover success, portable terminal X finishes response message by switching and informs that sub-district C switches and finish that portable terminal X stops the measurement task that sub-district B is disposed simultaneously;
Step 113: sub-district C sends end message query requests (UEInformationRequest) message to portable terminal X, indicates the terminal to report measurement result;
Step 114: portable terminal X responds end message and replys (UEInformationResponse) message, wherein carries to comprise velocity factor S
MediumIn interior measurement result;
Step 115: after sub-district C obtains measurement result, send handover report (Handover Report) message to sub-district B, indicating type is the not reporting measurement result of portable terminal X, and carries this measurement result;
Step 116: after sub-district B receives handover report and extracts measurement result, can analyze on the movement locus of portable terminal X from position A to position B the situation of change of sub-district A, sub-district B and the descending wireless Reference Signal Received Power RSRP of sub-district C.Can guarantee that still portable terminal X keeps the wireless connections with these sub-districts, judges that then " switching fast " problem exists, and further assesses the optimization range that moving parameter is provided with even suppose that sub-district B not thinks to switch.
Step 117: sub-district B sends handover report (Handover Report) to sub-district A, and " switching fast " problem of having informed takes place, and carries measurement result for the relevant Radio Link situation of its analysis and evaluation;
Step 118: sub-district A and sub-district B all initiate moving parameter modification (Mobility Setting Change) process are set.Sub-district B consults with sub-district A and sub-district C, heightens the handoff threshold value, for example 3dB; Sub-district A and sub-district C then consult to turn down handoff threshold value, for example 3dB.Moving parameter is provided with modification process can carry out repeatedly, finally eliminates between sub-district A and the sub-district B and the unnecessary switching between sub-district B and the sub-district C.Contrast before and after optimizing as shown in Figure 8.
The above is one embodiment of the present of invention only, is not limited to the present invention.The present invention can have various suitable changes and variation.All any modifications of being done within the spirit and principles in the present invention, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (9)
1. the cooperation of many minizones is measured and is switched the method that optimization is set in the mobile communications network, it is characterized in that:
(1) a plurality of cell coordinations control portable terminals of this method requirement network side are finished at the Radio Link of its designated cell overlay area and are measured, and this zone is the target area that the minizone handover optimization is attempted to carry out in a plurality of sub-districts;
(2) the feasible cell-of-origin of initiating to measure of minizone cooperation measurement mechanism can obtain the measurement result of portable terminal from other cooperation cell, helps the cell-of-origin to detect the necessity of switching and the reasonability that moving parameter is provided with;
(3) unreasonable if the cell-of-origin finds to exist unnecessary switching or moving parameter to be provided with between cooperation cell, it can trigger the process that moving parameter is provided with optimization thus with this information notice cooperation cell;
(4) final, a plurality of cooperation cell can be revised parameter, avoid irrational switching, thereby the whole locomotive function that reaches network is optimized, and realize the lifting of performance of mobile communication system and capacity.
2. the method for claim 1 is characterized in that:
(1) this method does not limit the cooperation measurement of many minizones or switches the execution number of times that optimizing process is set, simultaneously, this method does not limit the quantity of the portable terminal of being responsible for execution measurement task yet, and the sub-district can specify one or more portable terminals to carry out cooperation measurement tasks;
(2) this method can be used in same portable terminal between a plurality of sub-districts continuously more than the situation of twice quick switching, also can be used in the situation that double switching takes place a plurality of portable terminals simultaneously between two or more sub-districts;
(3) this method does not limit cooperation cell and whether belongs to different base stations, and when the cooperation cell that communicates when needs belonged to same base station, the then aforementioned information of mentioning will be transmitted with the inside of base station means of signaling;
(4) this method is applicable to that also interval generation of double small switch continuously fast, promptly for the first time the handover source sub-district and for the second time switching target small area be the situation of same sub-district.
3. the method for claim 1 is characterized in that:
(1) for the detection of switching problem, the sub-district is provided for judging some timers of the normal residence time lower limit of portable terminal, corresponds respectively to different translational speed scopes, the covering radius Radius of the classification of timer and value and current area
CellAnd portable terminal translational speed UE
SpeedThe sorting technique that is adopted is relevant;
(2) sub-district can also be according to information such as the translational speed of the coverage of current area, terminal and the normal residence times of portable terminal, the measuring period that cooperation is measured, measures the duration or measure total degree and measurement result postpones to report and is optimized at interval;
(3) further, the negotiation that the minizone moving parameter is provided with can be distinguished ground and use different parameters optimization at different moving velocity of terminal classification.
4. method as claimed in claim 3 is characterized in that:
(1) in order to realize detection to switching problem, the sub-district is tackled the relevant information of following scene and is carried out record: the scope when the cell detection portable terminal that it was once served to certain enters into this sub-district earlier by switching under, of short durationly switch to next sub-district again after resident, should comprise the residence time T of portable terminal in the information of record at least
Ue_stayed, translational speed UE
Speed, portable terminal enters the Target cell that the switching historical information, portable terminal of the source Serving cell before this sub-district are switched;
(2) when cell detection to the portable terminal that takes place to switch fast continuously, with utilization record portable terminal translational speed UE
SpeedInformation is carried out scene analysis, and method is comparison portable terminal residence time T in the sub-district
Ue_stayedSet point with the normal residence time lower limit of the pairing portable terminal of translational speed type timer, if the former is less than the latter, then can judge handover event has fast taken place between the neighbor cell that relates in this handoff procedure continuously, and can determine that current area is the middle sub-district in the continuous fast handover procedures.
5. method as claimed in claim 3 is characterized in that:
The sub-district can in the handoff request acknowledgment message of returning, provide the measurement configuration information at portable terminal in other handover source sub-district when it sends handover preparation request message, measurement is a periodic measurement or based on the periodic measurement of Event triggered.In the measurement configuration information, should comprise following content at least:
(1) measuring object: mainly show the neighbor cell of deciding frequency range, be designated as cellList, middle sub-district should require portable terminal at least several relevant sub-districts of continuous fast handover procedures to be measured;
(2) trigger condition: can threshold value be set at the measurement result of some measuring objects, so that portable terminal can start this measurement when condition satisfies, be used for periodic measurement process based on Event triggered, the parameter of this measurement is made as option, when configure trigger condition not represents that then portable terminal should start the measurement task immediately;
(3) measurement result: the measurement result type of configuration portable terminal, be designated as measResult;
(4) measuring period: the configuration portable terminal carries out the time interval of periodic measurement, is designated as measPeriod;
(5) measure the duration: the configuration portable terminal carries out the total time length of periodic measurement, is designated as measDuration, or adopts the mode of measuring total degree to express, and is designated as measAmount;
(6) measurement result postpones to report at interval: the configuration portable terminal postpones reporting measurement result's the time interval, is designated as Tdelay, portable terminal need stores it heretofore interbody spacer arrive and just report this result, the parameter of this measurement is made as option;
(7) velocity factor: portable terminal is according to the translational speed of self, utilizing velocity factor that measuring period, measurement duration and measurement result are postponed to report at interval handles, and get the result as measuring configuration, be designated as S, velocity factor is corresponding with the UEspeed sorting technique of portable terminal translational speed.
6. method as claimed in claim 5 is characterized in that:
(1) above-mentioned measurement configuration information will carried in aforesaid handover source sub-district in the switching command that sends to portable terminal, after portable terminal receives measurement configuration information, finish corresponding processing procedure, also adjusting measuring period, measurement duration and measurement result accordingly comprising the selected velocity factor that is suitable for postpones to report at interval, then, portable terminal is carried out switching command, sub-district in the middle of being connected to.The sub-district becomes the current service cell of portable terminal in the middle of this moment, meanwhile, and the measurement action that the sub-district was disposed in the middle of portable terminal started;
(2) during the resident middle sub-district of portable terminal, following adjustment is made in the measurement configuration that middle sub-district is carried out before can taking place aforementioned switching:
-increase or the deletion measuring object;
Other content in the configuration is measured in-adjustment;
-postpone to report interval T in measurement result
DelayStop this measurement before not overtime.
7. method as claimed in claim 6 is characterized in that:
Measurement result takes place during the sub-district in the middle of portable terminal is resident postpone to report interval T
DelayOvertime incident, carry out according to the following steps:
(1) portable terminal stops to measure, and implementation method can be that this measurement of portable terminal proactive notification current service cell is finished, and its measurement result of storing has to be reported; Or the configuration information that writes down by inside of middle sub-district, find that this portable terminal measurement result postpones to report interval T
DelayOvertime, expression is measured and is finished, and requires the mobile terminal reporting measurement result, and portable terminal is finished measurement result measResult by measurement report message and reported, comprising the value of the selected velocity factor of portable terminal, so that the sub-district is analyzed more accurately;
(2) receive the measurement result of mobile terminal reporting after, this portable terminal is analyzed on its motion track top or all switch the metrical information of overlapping region, the minizone wireless signal of related cell continuously fast in middle sub-district, if middle sub-district is thought after analyzing data, can guarantee also that even do not switch portable terminal keeps and the wireless connections of these sub-districts, then the handoff parameter between sub-district and related cell is provided with existing problems in the middle of the decidable, caused unnecessary " switching fast " to take place, correspondingly, the optimization range that moving parameter is provided with will be assessed in middle sub-district;
(3) the problem existence " is switched " fast by handover report message informing neighbor cell in the sub-district in the middle of, and measurement result can be provided so that the neighbor cell analysis, subsequently, the minizone can start the mobile renewal process that is provided with, consult the moving parameter setting respectively and finish optimization work, eliminate " switching fast " problem;
(4) so far, this switching problem testing process is finished, and the sub-district can enter new round process.
8. method as claimed in claim 6 is characterized in that:
(1) measurement result not taking place as yet postpones to report interval T during the sub-district in the middle of portable terminal is resident
DelayOvertime incident, middle sub-district can switch to Target cell with aforementioned portable terminal, and can obtain the measurement result of portable terminal from Target cell;
(2) in the method that the present invention proposes, can in handoff procedure, notify the relevant portable terminal of cooperation cell to measure the information of task by initiating to measure the sub-district, also can be after switching to cooperation cell by portable terminal, the information of the relevant measurement task of proactive notification cooperation cell, the effect that above-mentioned two kinds of realization approach can reach is identical.
9. method as claimed in claim 8 is characterized in that:
Measurement result does not take place during the sub-district in the middle of portable terminal is resident as yet postpone to report interval T
DelayOvertime incident, middle sub-district may need aforementioned portable terminal is switched to Target cell, carry out according to the following steps:
(1) handover preparation request is sent to Target cell in the sub-district in the middle of; Subsequently, middle sub-district receives after Target cell returns handoff request acknowledgment message, sends switching command to portable terminal; Portable terminal is carried out to switch and is connected to Target cell, and stops the cell-of-origin when finishing switching, the measurement action that promptly middle sub-district is disposed;
(2) Target cell learns that portable terminal still has the measurement result that does not report, and then after portable terminal is finished switching, as the new Serving cell of this terminal, requires the mobile terminal reporting measurement result by end message inquiry signaling procedure:
(3) new Serving cell sends the end message inquiry request message to portable terminal, requires the terminal to report measurement result; Portable terminal sends the end message response message, has wherein comprised measurement result, and measurement result should comprise the value of the selected velocity factor of portable terminal, so that the sub-district is analyzed more accurately;
(4) after Target cell obtains measurement result,, indicate the type not reporting measurement result of aforementioned portable terminal for this reason to the cell-of-origin (sub-district promptly) at place before this portable terminal transmission handover report message, and measurement result incidentally;
(5) sub-district receives handover report in the middle of, and after extracting measurement result, analyzes and switch the radio signal quality of related cell in the overlapping region, minizone continuously fast; If middle sub-district is judged, can not guarantee that still portable terminal keeps and the wireless connections of these sub-districts even do not switch, then decidable " switching fast " problem exists, and the optimization range of assessment moving parameter setting; Middle sub-district sends handover report message to the cell-of-origin of switching for the first time, and " switching fast " problem of having informed takes place, and the portability measurement result is for the relevant Radio Link situation of its analysis and evaluation;
(6) cell-of-origin of switching for the first time is that sub-district A or the Target cell that switches for the first time are that sub-district B all can start moving parameter renewal process is set, consult the moving parameter setting in twos and finish optimization work in three related minizones, eliminate " switching fast " problem, so far, the step of branch two is finished, and the sub-district can enter the switching problem testing process of a new round.
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