CN1214680C - Method for detecting variable frequency community signal under layered mobile communication network compressed mode - Google Patents
Method for detecting variable frequency community signal under layered mobile communication network compressed mode Download PDFInfo
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- CN1214680C CN1214680C CN 02112366 CN02112366A CN1214680C CN 1214680 C CN1214680 C CN 1214680C CN 02112366 CN02112366 CN 02112366 CN 02112366 A CN02112366 A CN 02112366A CN 1214680 C CN1214680 C CN 1214680C
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Abstract
The present invention relates to a different frequency subzone signal measuring method in the layered mobile communication network compression mode, which is mainly applied to the field of mobile communication in a layered structure. For being perfectly suitable for the requirements of the third generation mobile communication, the present invention proposes a tracking measuring method integrating periodic measurement and event triggering measurement for monitoring different frequency subzone signal quality. The use of the present invention not only reduces the number of times of different frequency measurement during unit time, but also ensures the performance of systems.
Description
Technical field
The present invention relates to adopt the moving communicating field of hierarchy, relate in particular to the method for detecting variable frequency community signal under a kind of layered mobile communication network compressed mode.
Background technology
Arrival along with the 3G (Third Generation) Moblie epoch, mobile radio communication certainly will expect to have more strong functions, to adopt the system configuration of more optimizing aspect network layer, according to present state of development, layered cell structure will become one of core technology of 3G (Third Generation) Moblie for this reason.So-called floored community, be exactly system in distributing radio resource, take into full account the optimization of entire system, translational speed faster the user assign to bigger macrocell, and slow user assigns to Microcell.Current consideration based on aspects such as interference and capacity, the scheme that adopts in suggestion aspect the configuration of whole hierarchical system network is to adopt different frequency between macrocell and the Microcell, with adopting same frequency between layer sub-district.In switching, correspondingly have like this with switching frequently and the alien frequencies switching, because cost difference with the switching of frequency/alien frequencies, in order to reduce the expense of system as far as possible, wish soon/user is being switched in grand accordingly/Microcell as far as possible separately at a slow speed, just carries out the switching between (or with layer) with frequently as far as possible.
But, though be to wish to avoid alien frequencies to switch in theory as far as possible, but be inevitably in the reality, that is to say to remain and need carry out the measurement of alien frequencies.Here said different-frequency measure is exactly in fact to make the travelling carriage monitoring from the signal quality of the cell base station of different levels by system command, thereby goes to guarantee can to have when travelling carriage need carry out the alien frequencies switching enough information to guarantee that the mobile subscriber switches in the proper cell.
In the process of different-frequency measure, common solution mainly contains two kinds at present.A kind of is that travelling carriage adopts double-receiver, increases and the complexity of travelling carriage raises but the thing followed is the additional power consumption, the cost that bring; Another adopts compact model (compressed mode) exactly, and for the condensed frame that comprises transmission intercal (transmission gap), its transmitting power will improve accordingly, and this mode is more common in actual application.But should be noted that, when system adopts compact model, will inevitably bring some performance loss, so under the prerequisite that guarantees systematic function, need to reduce the measurement number of times that carries out different-frequency measure in the unit interval as far as possible.
Summary of the invention
In order better to adapt to the requirement of 3G (Third Generation) Moblie, the present invention proposes the method that a kind of tracking measurement mode that combines by periodic measurement and Event triggered measurement reaches monitoring alien-frequency district signal quality.The use of this invention had both reduced the number of times of different-frequency measure in the unit interval, had guaranteed the performance of system simultaneously again.
The present invention is achieved in that
Method for detecting variable frequency community signal under a kind of layered mobile communication network compressed mode, under the situation of macrocell, travelling carriage is by the signal of the geographical position measurement alien frequencies Microcell of tracking UE for the travelling carriage serving BS, and this method comprises the steps:
A. different-frequency measure starts, the startup of described different-frequency measure, and the mode that adopts periodic triggers and Event triggered to combine, wherein, the step that described periodic triggers is measured is as follows:
A1. after periodicity different-frequency measure (15) is carried out in judgement, start different-frequency measure timer Timer (16);
A2.UE carries out different-frequency measure, the signal quality (17) of monitoring alien-frequency district;
A3. judging whether Boolean type variable Mean inter is True (18), is the carrying out of property interrupt cycle different-frequency measure then, and Timer resets with timer, carries out step a1 again;
A4. otherwise, then whether judgement timer Timer (19);
A5. the time resets (20) to timer Timer then, carries out step a; Not then, then do not do any action;
B. after travelling carriage switches to the upper strata macrocell and accepts the service of macro cell base station (10), write down last and be the microcell base station of its service (12);
C. microcell base station (12) and several Microcells (11) that close on every side thereof are put into the array Meas_group that the expression current service cell is the alien-frequency district of macrocell and this Serving cell
2,2In;
D. after measuring,, choose wherein that the best microcell base station (13) of signal quality is next center of following the tracks of circle (14), choose it again and several Microcells that close on are on every side put into Meas_group according to measurement result
2,2In;
E. repeating step a-d;
F. finish the location of mobile terminal UE.
Wherein, above-mentioned sub-district has different configuration parameters, comprises radius of society, small area shape.After new calling was admitted by system, UE will begin to carry out periodic common frequency measurement.
This incident triggering, in the time of one of in having following three conditions, Mean_inter is set to True:
A. the signal quality of co-frequency cell is not enough to keep communicating requirement;
B. co-frequency cell does not have available idle channel:
The speed attribute of c.UE is from changing at a slow speed fast.
Be to calculate according to the translational speed of travelling carriage to get the cycle time of this periodic triggers, and periodically the cycle of different-frequency measure can be done corresponding the adjusting according to practical application.The periodic triggers of this different-frequency measure can reduce the different-frequency measure number of times by its cycle of suitable lengthening as far as possible.
Adopt the present invention can obtain following remarkable result:
1. the defective that additional power consumption, the cost of avoiding thereupon bringing because adopt the travelling carriage double-receiver increases and the complexity of travelling carriage raises.
2. can avoid because frequent some function losses of periodically adopting compact model and bringing.
3. periodic measurement is combined with the Event triggered measurement, guaranteeing to reduce the carrying out of different-frequency measure under the prerequisite of systematic function as far as possible.
4. taken into full account the actual conditions of current communication system, realistic, those skilled in the art just can grasp, and the field has a wide range of applications.
5. this method is reliable, and is easy, can carry out the different-frequency measure of travelling carriage quickly and accurately.
Description of drawings
Fig. 1 is a hexagon macrocell schematic diagram.
Fig. 2 is the Microcell schematic diagram of Manhattan structure.
Fig. 3 is the structural representation of double-layer separate layer network.
Fig. 4 is the schematic diagram of Microcell for the Current Serving BTS of UE.
Fig. 5 establishes the process schematic diagram for the different-frequency measure target.
Fig. 6 is the periodic triggers binding events triggering flow chart of different-frequency measure.
Embodiment
Below in conjunction with the concrete flowchart text course of work of the present invention.
For the ease of the elaboration of invention, it is as follows that the mobile communication system structure that the mobile subscriber inserts is set:
1. system structure model adopts two-layer honeycomb layered cell structure;
2. as shown in Figure 1, macrocell adopts traditional hexagonal structure, and macro cell base station 1 is positioned at hexagonal center, uses the omnidirectional antenna that places hexagonal centre, 1000 meters at interval of macro cell base station, and radius of society is 577 meters;
3. as shown in Figure 2, Microcell adopts the Manhattan structure, places a microcell base station 2 every an intersections of streets point.Each block 3 size is made as 75 * 75 meters, and road width 4 is made as 15 meters.
4. be illustrated in figure 3 as hierarchy, i.e. 5 Manhattan blocks 6 that macrocell 5 is covered with.Fig. 3 is the structural representation of a double-layer separate layer network, so the macro cell base station 7 of only having drawn in the drawings, the microcell base station in the Manhattan block does not specifically draw, wherein microcell base station distribute with Fig. 2 in identical.Certainly, different systems can have different cell structure configuration methods, for different configuration parameters, and as different radius of societies, small area shape etc., thought of the present invention is suitable equally.Here, such system configuration method to set up just of the present inventionly further specifies for the ease of following.
According to the top system configuration of setting forth,, will mark its corresponding unique sub-district indications for each sub-district in the system information the inside.Generally, travelling carriage is monitored its several base stations of closing on and just can be satisfied the speech quality requirement substantially.In order to guarantee speech quality, guarantee systematic function, need the mobile subscriber in the process of conversation, not only will monitor the co-frequency cell that closes on, also to monitor the alien-frequency district that closes on.
In order clearly to carry out following elaboration, a variable Meas_group is set earlier
I, j(i, j=1,2).System disposes corresponding array Meas_group for corresponding sub-district, each sub-district indications
I, j(i, j=1,2) deposit the station list that it closes in the array, be when this base station during as the serving BS of certain travelling carriage the target that travelling carriage will be monitored.We are provided with the measurement number that can dwindle travelling carriage like this, reduce system signaling burden and other expense.Meas_group
I, jThe implication that (i, j=1,2) refer to is as follows: i=1 represents that Serving cell is a Microcell; I=2 represents that Serving cell is a macrocell; J=1 represents the co-frequency cell of Serving cell and this Serving cell; J=2 represents the alien-frequency district of Serving cell and this Serving cell.
Portable terminal (User Equipment is abbreviated as UE) can be divided into following two classes according to the attribute of the beasurement base Current Serving BTS that system information need be carried out:
1. the Current Serving BTS of UE is the situation of Microcell:
As shown in Figure 4, it can just set according to the geographical distribution of each microcell base station in advance with monitoring objective frequently, corresponding to the sub-district indications of a corresponding Current Serving BTS 8 corresponding M eas_group is just arranged
1,1, promptly be included in the microcell base station in the circle 9.
Because the upper strata macrocell coverage area is bigger, the number of macro cell base station is less, so Meas_group is set
1,2In comprise 5 macro cell base station on upper strata.This situation is fairly simple, and UE is easy to realize the measurement task of alien frequencies.
2. the Current Serving BTS of UE is the situation of macrocell:
It is set to Meas_group with measurement target frequently
2,1In comprise the Current Serving BTS of this travelling carriage, remaining 4 macro cell base station.
Realization is to Meas_group
2,2Setting, the method for here adopt following the tracks of realizes.When switching to upper strata macrocell reception service, the establishment of travelling carriage different-frequency measure target is in the case realized in the position of last microcell base station of service that receives by the memory travelling carriage.In conjunction with shown in Figure 5, after travelling carriage switches to the upper strata macrocell and accepts the service of macro cell base station 10, write down last and be the microcell base station 12 of its service, itself and several Microcells (in circle 11 zones) that close on every side thereof are put into Meas_group
2,2In, after the measurement,, choose a best microcell base station of signal quality wherein 13 and be next center of following the tracks of circle 14 according to measurement result, choose it again and several Microcells that close on are on every side put into Meas_group
2,2In, the rest may be inferred.
By such recursion mode, realized indirect tracking on the one hand to the UE geographical position, the roughly location of having finished UE has also been reduced the measurement target number of different-frequency measure on the other hand, and has been saved Measuring Time.
After new calling is admitted by system, UE will begin to carry out periodic common frequency measurement, and in order to reduce the different-frequency measure under the compact model as far as possible, the mode that the startup of different-frequency measure then adopts periodic triggers and Event triggered to combine, thereby realize monitoring, for change action is prepared the judgement foundation to the peripheral base station signal quality.
Adopt periodic triggers to be because, measure the alien frequencies signal as not carrying out periodic triggers, in some cases, the floored community interlayer switches and may will fail because of the long different-frequency measure time.So when adopting Event triggered,, can guarantee the alien frequencies success rate for switching, reduce cutting off rate in conjunction with periodic triggers.
For the periodic triggers of different-frequency measure, can reach the purpose that as far as possible reduces the different-frequency measure number of times by its cycle of suitable lengthening.The Manhattan structure of introducing according to the front, it is 180 meters apart from D between two adjacent microcell base stations, suppose that we can estimate its run duration T between two adjacent microcell base stations, thereby estimate the time interval of different-frequency measure as UE during with a certain speed V constant motion.That is to say that based on this computing time, we can know, at this moment between in UE can not walk out two distances between adjacent base station, according to the tracking of last Microcell that UE accepted to serve, can reach comparatively ideal effect so.
Below form be to estimate according to the speed representative value that each velocity shooting of UE is chosen, UE with constant speed V (unit be kilometer per hour, km/h) two adjacent microcell base stations required times of distance of passing by are made as T (unit are seconds, s).Computing formula is as follows: T=D/V
| V(km/h) | 200 | 150 | 100 | 80 | 50 | 20 | 10 | 5 | 3 |
| T(s) | 3.24 | 4.32 | 6.48 | 8.1 | 12.96 | 32.4 | 64.8 | 129.6 | 216 |
Choose the wherein data of compromise, initial condition (UE this time call out just admitted by system) the periodically cycle Cycle Timer of different-frequency measure is made as ten superframes of WCDMA (superframe is 720ms, and promptly 10 * 720ms=7.2s) carry out once periodic different-frequency measure.Here, should be noted that, go out user's translational speed attribute when systematic survey after.The value of Cycle Timer can change dynamically according to user's translational speed, so that Cycle Timer has more reasonability, makes and is guaranteeing to reduce the carrying out of different-frequency measure under the prerequisite of systematic function as far as possible.
Under the little prerequisite of carrying out the periodic triggers measurement of trying one's best, the present invention can conclude to draw for UE is provided with the constrained parameters that the incident triggering starts different-frequency measure, mainly contains following three kinds of possible situations and need carry out the measurement of the alien frequencies of incident form:
1. the signal quality of co-frequency cell is not enough to keep communicating requirement;
2. co-frequency cell does not have available idle channel;
3. the speed attribute of UE changes (UE ← → quick UE) at a slow speed.
When any in three kinds of situations of the measurement of the alien frequencies of above-mentioned incident form took place, UE carried out the measurement of alien frequencies with regard to the desirable system order, in case enter, with regard to the triggering of reset cycle property.Referring to shown in Figure 6, variable declaration wherein is as follows:
Timer----refers to the timer of different-frequency measure periodic triggers, and (initial value is set to 10 * 720ms=7.2s) to be set to Cycle Timer;
Mean_inter----Boolean type variable, when three of the Event triggered different-frequency measure may situations when one takes place at least, then it is set to True, and the timer Cycle Timer of the different-frequency measure periodic triggers that resets simultaneously.
Shown in Fig. 6, after periodicity different-frequency measure 15 is carried out in judgement, start different-frequency measure timer Timer 16, UE carries out different-frequency measure then, the signal quality 17 of monitoring alien-frequency district.Judging whether Boolean type variable (Mean_inter) is True18, is the carrying out of property interrupt cycle different-frequency measure then, and Timer resets with timer, carries out periodicity different-frequency measure 15 again.Whether judgement timer Timer then 19 in this process, if the time is to then making timer Timer reset 20, if less than not then, then do not do any action.Carrying out in the process of periodicity different-frequency measure, when if above-mentioned three conditions of different-frequency measure of startup incident form being arranged one satisfying at least, then the Boolean type variable Mean_inter of Event triggered different-frequency measure is set to True, meanwhile, carrying out with property interrupt cycle different-frequency measure, Timer resets with timer, carries out the periodicity different-frequency measure of a new round again, obtains the information of up-to-date UE received signal with expectation.
Claims (7)
1, the method for detecting variable frequency community signal under a kind of layered mobile communication network compressed mode, it is characterized in that, under the situation of macrocell, travelling carriage is by the signal of the geographical position measurement alien frequencies Microcell of tracking UE for the travelling carriage serving BS, and described method comprises the steps:
A. different-frequency measure starts, the startup of described different-frequency measure, and the mode that adopts periodic triggers and Event triggered to combine, wherein, the step that described periodic triggers is measured is as follows:
A1. after periodicity different-frequency measure (15) is carried out in judgement, start different-frequency measure timer Timer (16);
A2.UE carries out different-frequency measure, the signal quality (17) of monitoring alien-frequency district;
A3. judging whether Boolean type variable Mean_inter is True (18), is the carrying out of property interrupt cycle different-frequency measure then, and Timer resets with timer, carries out step a1 again;
A4. otherwise, then whether judgement timer Timer (19);
A5. the time resets (20) to timer Timer then, carries out step a; Not then, then do not do any action;
B. after travelling carriage switches to the upper strata macrocell and accepts the service of macro cell base station (10), write down last and be the microcell base station of its service (12);
C. microcell base station (12) and on every side several thereof being closed on Microcells (11), to put into the expression current service cell be the array Meas_group2 of the alien-frequency district of macrocell and this Serving cell, in 2;
D. after measuring,, choose wherein that the best microcell base station (13) of signal quality is next center of following the tracks of circle (14), choose it again and several Microcells that close on are on every side put into Meas_group2, in 2 according to measurement result;
E. repeating step a-d;
F. finish the location of mobile terminal UE.
2, the method for detecting variable frequency community signal under a kind of layered mobile communication network compressed mode as claimed in claim 1, it is further characterized in that described sub-district has different configuration parameters, comprises radius of society, small area shape.
3, the method for detecting variable frequency community signal under a kind of layered mobile communication network compressed mode as claimed in claim 1, it is further characterized in that after new calling was admitted by system, UE will begin to carry out periodic common frequency measurement.
4, the method for detecting variable frequency community signal under a kind of layered mobile communication network compressed mode as claimed in claim 1, it is further characterized in that, described incident triggering, in the time of one of in having following three conditions, Mean_inter is set to True:
A. the signal quality of co-frequency cell is not enough to keep communicating requirement;
B. co-frequency cell does not have available idle channel;
The speed attribute of c.UE is from changing at a slow speed fast.
5, the method for detecting variable frequency community signal under a kind of layered mobile communication network compressed mode as claimed in claim 1, it is further characterized in that be to calculate according to the translational speed of travelling carriage to get the cycle time of described periodic triggers.
6, the method for detecting variable frequency community signal under a kind of layered mobile communication network compressed mode as claimed in claim 1, it is further characterized in that the cycle of described periodicity different-frequency measure can be done corresponding the adjusting according to practical application.
7, the method for detecting variable frequency community signal under a kind of layered mobile communication network compressed mode as claimed in claim 1, it is further characterized in that, the periodic triggers of described different-frequency measure can reduce the different-frequency measure number of times by its cycle of suitable lengthening as far as possible.
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| CN100366126C (en) * | 2004-11-08 | 2008-01-30 | 华为技术有限公司 | Method for selecting non-common frequency measurement neighbouring region to make measurement |
| CN100409718C (en) * | 2005-06-13 | 2008-08-06 | 大唐移动通信设备有限公司 | Different-frequency measure reporting method for TDD-CDMA system |
| GB0800767D0 (en) * | 2008-01-16 | 2008-02-27 | Nec Corp | A method for controlling access to a mobile communications network |
| CN102740349B (en) * | 2011-04-07 | 2015-06-10 | 联发科技（新加坡）私人有限公司 | Terminal measurement scheduling method and device |
| CN102917392B (en) * | 2011-08-05 | 2016-03-09 | 华为技术有限公司 | The method and apparatus of cell measurement and Survey control |
| CN103108333B (en) * | 2011-11-10 | 2015-07-22 | 中兴通讯股份有限公司 | Measuring method for pilot frequency and disparate system and mobile terminal |
| EP3437344B1 (en) * | 2016-04-01 | 2020-10-14 | Telefonaktiebolaget LM Ericsson (publ) | Technique for configuring a periodic operation in a wireless communication system |
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