CN1351806A - Method for cell load sharing in a cellular mobile radio communicaltions system - Google Patents

Method for cell load sharing in a cellular mobile radio communicaltions system Download PDF

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Publication number
CN1351806A
CN1351806A CN00807892A CN00807892A CN1351806A CN 1351806 A CN1351806 A CN 1351806A CN 00807892 A CN00807892 A CN 00807892A CN 00807892 A CN00807892 A CN 00807892A CN 1351806 A CN1351806 A CN 1351806A
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China
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sub
district
neighbor cell
load
mobile radio
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L·斯特雷贝里
C·阿克松
R·卡尔松
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Telefonaktiebolaget LM Ericsson AB
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Telefonaktiebolaget LM Ericsson AB
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
    • H04W16/02—Resource partitioning among network components, e.g. reuse partitioning
    • H04W16/06—Hybrid resource partitioning, e.g. channel borrowing
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/16—Performing reselection for specific purposes
    • H04W36/22—Performing reselection for specific purposes for handling the traffic

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

Abstract

In a method of load sharing between a first cell (C4) and its neighbouring cells (C1, C2, C3, C5, C6, C7) in a cellular mobile radio system, wherein each cell serves a number of mobile stations (1, A, B, C, D), it is determined if the traffic load of said first cell (C4) is higher than a first load threshold (201, 202), and if so, it is determined if the traffic load of the neighbouring cells (C1, C2, C3, C5, C6, C7) is lower than a second load threshold (203). If it is lower, at least a neighbouring cell (C5) having the highest number of mobile stations, associated with said first cell (C4), with a signal strength above a signal strength threshold (204) is selected from the neighbouring cells (C2, C5, C7). The cell coverage of said neighbouring cell (C5) is increased towards said first cell (C4) (205), and the cell coverage of said first cell (C4) is decreased a corresponding amount in a direction from said neighbouring cell (C5) (206).

Description

The method of sub-district load balancing in the cellular mobile radio communication system
Invention field
The present invention relates generally to a kind of in the cellular mobile radio communication system method of minizone load balancing, more specifically, relate to a kind of method of load balancing, wherein to cover be dynamically to change in the sub-district of several sub-districts.
Description of the Prior Art
There is one group of adjacent sub-district each sub-district in cellular mobile radio communication system or Cellular Networks, and wherein many mobile radio stations are served in each sub-district.
When a mobile radio station passes the border from a sub-district to another sub-district in a Cellular Networks, in this system, carry out and shift or switching.Because there are several adjacent sub-districts each sub-district, this system must determine transfer to which sub-district.A communication traffic channel must be idle in the selected neighbor cell that supplies to shift.
The stochastic behaviour that a common problem in the cellular mobile radio communication system is communication service in some cases even produce crowded in correct selected cellular system.It is when interim partial load peak that cell load is shared (CLS), and a specific character that increases network capacity is provided by allocate communications business load between neighbor cell.Communications traffic load in a sub-district can demonstrate big statistics change at short notice.
US-A-5 241 685 discloses a kind of method that is used for carrying out load balancing between the sub-district of mobile radio system, therein by dynamically moving the border between any two sub-districts, the sub-district of feasible overload diminishes and makes adjacent sub-district become big, thereby realizes load balance.Therefore, when a cell-overload, this system determines whether which is that load is minimum in any neighbor cell that does not transship and the sub-district.If a such sub-district exists, then from the direction of this neighbor cell, increasing the signal strength threshold of this overloaded cells, and/or from the direction of this overloaded cells, reducing the signal strength threshold of this neighbor cell.By dynamically changing these threshold values, with the effective area or the increase of these sub-districts or reduce, make the alteration of form of sub-district.The effective area of this overloaded cells is reduced to such degree, makes in overloaded cells to handle seldom mobile radio station, and handle plurality purpose mobile radio station in adjacent cell.
According to US-A-5 241 685, little in order to guarantee that cell sizes changes, at least one neighbor cell is carried out cell boarder at every turn and move.Yet, do not predict this mobile effect, before enough mobile radio stations were shifted out from this sub-district with high communications traffic load, this method may cause moving of several neighbor cells border.
And the each only mobile predetermined small step of cell boarder is to avoid a large amount of transfers.
This algorithm is slow, and risk outstanding because the characteristic that cell load is shared will be delayed to activate, therefore, only provides the time of available reluctantly effect.
Summary of the invention
An object of the present invention is in the cellular mobile radio communication system, to provide improving one's methods that a kind of cell load shares, handle interim load summit in the sub-district and do not increase extra local resource, still keep the service quality in this system simultaneously.
By being implemented in the foundation load sharing method of the present invention between first sub-district and its neighbor cell in the cellular mobile radio system of serving many mobile radio stations in each sub-district, realized this purpose.The communications traffic load that determines whether first sub-district is higher than first load threshold.If, the communications traffic load that determines whether this neighbor cell is lower than second load threshold, if, from neighbor cell, choose at least one adjacent sub-district with the communications traffic load that is lower than described second load threshold, this sub-district have a highest number with the relevant mobile radio station in described first sub-district, its signal strength signal intensity is on signal strength threshold.The sub-district of at least one neighbor cell is covered towards this first sub-district direction increase, and the sub-district covering of this first sub-district is reduced in the direction from this at least one neighbor cell with corresponding degree.
In another embodiment of the invention, determine the position of mobile radio station in order to share the communications traffic load that is arranged in the mobile radio station of borderline region between the communication system neighbor cell.The communications traffic load that determines whether first sub-district is higher than first load threshold.If, the communications traffic load that determines whether neighbor cell is lower than second load threshold, if, from neighbor cell, select at least one neighbor cell with the communications traffic load that is lower than described second load threshold, this sub-district has the highest mobile radio station number relevant with described first sub-district, in the distance threshold that leaves the cell boarder between first sub-district and neighbor cell.The sub-district of this neighbor cell is covered towards the first sub-district direction increase, and the sub-district covering of this first sub-district is reduced in leaving the direction of this neighbor cell with corresponding degree.According to another aspect of the present invention, in order to reduce the communications traffic load of first sub-district, it makes to become and is lower than described first load threshold, determines the sub-district of each sub-district covers what to be changed.
An advantage of the invention is the fluctuation in effective processing communications traffic load, the sub-district with each sub-district covers with enough little step change therein, also can be enough quick to prevent vibration.
The accompanying drawing summary
In order to explain the present invention and advantage of the present invention and feature in more detail, carrying out DESCRIPTION OF THE PREFERRED below with reference to accompanying drawing, wherein:
Fig. 1 be a Cellular Networks part key diagram and
Fig. 2 is with the first embodiment flow chart that explains according to method of the present invention.
Detailed Description Of The Invention
Increase network capacity according to a kind of honeycomb load balancing of the present invention (CLS) method by the communications traffic load between interim place, partial load peak distribution neighbor cell.The present invention relates to the field of cellular mobile radio communication system.And with the system of TDMA (time division multiple access) base for example, GSM especially.Yet, may be used on other system, as PDC standard etc.
With reference to figure 1, in Cellular Networks this illustrate, comprise 7 sub-district C1-C7, many mobile radio stations (MS) 1, A, B, C, D are served in each sub-district.Mobile radio station is base station (BS) to the interface of Cellular Networks, is usually located at the center of each sub-district.In order to set up or to keep the calling between two users in the Cellular Networks, mobile radio station must be got in touch with the base station.Because each sub-district has limited area, if mobile radio station 1 is moved out to another sub-district from the zone of a sub-district, it must be got in touch with different base stations.
Move and serve the switching node that switching center (MSC) is the many base stations of control.Depend on the configuration and the scale of network, need one or several MSC.
Certainly, a Cellular Networks that resembles the GSM (global system for mobile communications) comprises supplementary equipment therefore so that operate by suitable mode.Yet this is that experienced personnel know, and will be not for a more detailed description at this.
Therefore, in the following description, many distinctive details, for example number of sub-district etc. is at length provided so that provide the more thorough description to the present invention.For those skilled in the art will be tangible.The present invention can implement without these distinctive details.Some well-known characteristic as the base station, moves and to serve switching center and other system entity is not described in detail, so that do not make the present invention unclear.
In the such digital system of GSM, mobile radio station is monitored the perceptible power level of neighbor cell continuously.
The base station that each base station transmission will be measured or the catalogue of channel are to mobile radio station.Mobile radio station implement continuously to arrive/from the measurement of the transmission quality and the power level of Serving cell and neighbor cell.The result is placed into measurement report, and is periodically beamed back the base station.According to measurement result, can make decisions and take action, can according to the load that changes or other service conditions adjustment with deliver relevant signal strength threshold, retrain and/or other information parameter.
Usually, MS measures continuously and reports from the sub-district at its place with from its signal strength signal intensity of neighbor cell.If MS receives from neighbor cell recently from the better signal strength signal intensity of current service cell, just implement to deliver.
Therefore, by utilizing signal strength measurement, can determine the position of a specific MS between Serving cell BS and each the neighbor cell BS.Signal strength signal intensity from neighbor cell is high more, and MS is more near the cell boarder between Serving cell and the neighbor cell.
In order to identify the distribution of MS in the sub-district, determine each MS is near which adjacent sub-district.And a MS can be near more than one neighbor cell.
Serving cell BS receives from the signal strength measurement of each MS and with the result and deposits MS report catalogue in, and this is the panoramic catalogue of a system.Each sub-district is taken out data from MS report catalogue and is put into the MS distributed-directory, does not consider the identity of each MS.Data in the MS distributed-directory are used to the relative position of each MS in the calculation plot.
In a preferred embodiment of the invention, effective measurement result is used to this method,, avoid the variation in the interface aloft.
Just as mentioned above, the MS in busy pattern measures continuously from the signal strength signal intensity of Serving cell and next signal strength signal intensity since the audible many neighbor cells of current MS (Perch frequency), send information to BS in existing condition report.Therefore, neither need the report of change condition not need to revise MS again.
When receiving condition when report in coordinator node such as base station controller (BSC) or MSC, by with the respective cell identification adjacent sub-district of Perch frequency map to them, message is separated and be stored in the comprehensive MS report catalogue.
When condition is reported in when being received among the BS, all tabulated values about specific MS in MS report catalogue are eliminated.New value is stored.When a MS calling was terminated, all tabulated values of this MS were also removed from MS report catalogue, because will be without any the condition report of sending from this MS.This helps to keep MS report catalogue consistent with the MS distribution in the net.
If signal strength signal intensity is on certain threshold value, current area is transfused to MS report catalogue.When threshold value illustrates neighbor cell of mobile radio station close enough, so that utilize its BS that enough voice qualities are provided.
This catalogue is constantly upgraded by the information of MS report.This catalogue does not need storage.
Each tabulated value in catalogue comprises following content: finished the identity of the MS of measurement, finished the identity of the neighbor cell of signal strength measurement, the signal strength signal intensity that actual measurement is arrived and the identity of Serving cell.
For each sub-district a MS distributed-directory is arranged, comprise the identity of the neighbor cell that signal strength measurement finished and the signal strength signal intensity that actual measurement is arrived.
For each sub-district by coordinator node control, implement periodically updating of MS distributed-directory, wherein neighbor cell mark value and signal strength signal intensity are taken out from MS report catalogue.
This MS distributed-directory is number sorted according to neighbor cell, in each neighbor cell, according to the signal strength signal intensity classification that measures.
Before the renewal of finishing a sub-district, be removed for all MS distributed datas of this specific cell.Because the data in MS report catalogue are consistent, the MS distributed-directory also will distribute consistent with the MS in the net.
Table 1 illustrates the MS distributed-directory for sub-district C4 among Fig. 1., the mobile radio station A-D in table 1 provides for description of use, for operation of the present invention and inessential.
Table 1
MS distribution table (sub-district C4)
Cell number ????MS ????SS
????C2 ????A ????115dB
????C5 ????B ????120dB
????C5 ????C ????90dB
????C7 ????C ????100dB
????C7 ????D ????80dB
According to the measurement result of expression in the table 1, MSB has reported the strongest signal strength 120dB from BS among the C2 of sub-district, and MSA has reported the signal strength signal intensity 115dB from BS among the C2 of sub-district.And two measurement results from MSC are arranged: from the 90dB of BS among the C5 with from the 100dB of BS among the C7.At last, MSD has reported the signal strength measurement 80dB from BS among the C7.
According in the method for the present invention, utilize two threshold values to take grade control, a kind of dynamic control to the signal strength signal intensity offset parameter between Serving cell and the Target cell Gong delivering is provided.Like this, the offset parameter regulation is to the parallel adjusting of logical boundary, and just the sub-district is to the signal strength signal intensity relation of sub-district.This is reserved as the means of regulating signal strength values enough between two neighbor cells and is used in the cell selecting algorithm for communication traffic channel (TCH) distribution and location.
The number of idle TCH is by system monitoring in all sub-districts that the CLS function is activated.Its grade by continuously with two other system parameterss, just two predetermined communication traffic channel take grade and make comparisons.First load threshold is the communications traffic load in a sub-district, and CLS is activated on this grade, indicates a spot of idle TCH.Second load threshold is the communications traffic load in a sub-district, and CLS is accepted on this grade, indicates available capacity.
The flowcharting of the key step of the method for foundation a kind of embodiment of the present invention among Fig. 2.
In step 201, measure a Serving cell, C4 in this embodiment, communications traffic load.In step 202, determine whether that a sub-district has high communications traffic load, be higher than first load threshold, if, the border of sub-district should be moved inwardly by changing offset parameter, and just the sub-district covers and reduce.
Yet,, need at least one neighbor cell to have low communication service in order to reduce the covering of Serving cell C4.Therefore, determine that whether any neighbor cell of Serving cell C4 or the communications traffic load of some sub-districts are lower than second load threshold in step 203.If there is not the sub-district of such low communication business load to use, this method proceeds to step 207.
In step 204,, show in the neighbor cell of having the ability and select a neighbor cell with signal strength measurement of high with maintained service quality reception MS from having the low communication business load.According to table 1, be exactly neighbor cell C5.Yet if two or more sub-districts are arranged, C5 in this example and C7 have signal strength measurement of " the highest " numeral, represented first in the catalogue of these sub-districts, and just sub-district C5 is selected.In another embodiment, the sub-district with the most idle communication traffic channel is selected, just sub-district C7.
Therefore, the sub-district of described neighbor cell C5 covers be increased, and the sub-district of Serving cell C4 covers reduce corresponding quantity in leaving the direction of described neighbor cell.This reaches by changing biasing.
To move on to adjacent sub-district from Serving cell in order to find out how many MS, the MS distributed-directory is scanned current area.For each adjacent sub-district, the numeral with measurement result of enough signal strength signal intensities is counted.
In this embodiment, the neighbor cell with high signal strength measurement (the highest number of the MS of close cell boarder just) is selected, and supplies current sub-district C4 towards its mobile cell border, because obtain maximum unloading effect at this.
For the MS with enough numbers moves on to selected neighbor cell from Serving cell.Determine how many cell boarders will adjust.
MS near neighbor cell is stored according to the signal strength signal intensity in the MS distributed-directory.This means that the MS of close cell boarder is placed in first in the catalogue, the MS that has the cell boarder longest distance is placed in the last of catalogue.
Distance is measured with dB, and because the available dB of the variation of cell boarder calculates, system can predict, and cell boarder changes the MS that xdB will influence the Y number.
This means if the MS that system wants mobile Y number from Serving cell to adjacent sub-district, cell boarder is known by system, thus how many dB biasing should change.
In the example shown in Fig. 1, decision reduces and to take two TCH of grade among the C4 of sub-district, as a result of, in step 205, by towards service sub-district C4 at point 2 with put between 3 the sub-district of extending first border and increasing described neighbor cell C5 and cover, in step 206, to extending between putting 2 ' and 3 ', the sub-district of Serving cell C4 covers reduces corresponding quantity in the direction of leaving described neighbor cell at another on the border then.Like this, MSB and C are delivered and become by neighbor cell C5 provides service.
In also being shown in the another kind of situation of Fig. 1, decision reduces and to take three TCH of grade among the C4 of sub-district.According to the measurement result shown in the table 1, two cell boarders that move little C4 are only, two relate to sub-district C5, it is first sub-district that has the signal strength measurement of high in the catalogue, with sub-district C7, it is second sub-district that has the signal strength measurement of same high in the catalogue.Therefore,, extend towards service sub-district C4 at point 2 with between putting 3 by moving boundary in step 205, the sub-district of increase neighbor cell C5 covers and by moving second border, extends towards serving sub-district C4 at point 4 with between putting 5, and the sub-district that increases neighbor cell C7 covers.So as a result of, extend between point 2 ' and 3 ' on first border, second border also at another to extension between putting 4 ' and 5 '.In step 206, the sub-district of Serving cell C4 covers reduces corresponding quantity from the direction separately of described neighbor cell C5 and C7.Thereby by changing sub-district C4 and C5 respectively, the biasing between C4 and the C7 has realized this purpose, and MSB and C are by neighbor cell C5 service therein, and MSD is served by sub-district C7.
Further, in step 207, check whether all processed sub-districts are implemented.If there is any sub-district also not handled according to CLS method of the present invention, in step 208, select next sub-district C5, implement and the step identical sub-district C4.Yet if all sub-districts are processed, in step 209, this method is proceeding to next sub-district, before the sub-district C1 among just relevant with coordinator node a plurality of sub-district C1-C7, waits for one section delay time CLSDelay.
In another embodiment of the invention, check the neighbor cell that whether is confirmed as receiving sub-district or some sub-districts, be C5 (and C7) in this example, have enough efficient communication Traffic Channels, to receive the designated requisite number purpose mobile radio station of delivering from Serving cell C4.This inspection is for preventing that the neighbor cell overload from being necessary.Can use in order to have addressed this problem four kinds of interchangeable embodiments.
According to first embodiment, adjacent sub-district has one to allow it to receive the limit value of many mobile radio stations, is up to its first load threshold.Second embodiment comprises the delivering of mobile radio station, till the load of the neighbor cell of current Serving cell and reception is balanced or equates.Second embodiment is meant to be delivered, so that obtain being lower than its first load threshold in neighbor cell, but is higher than the load of its second load threshold.According to the 4th embodiment, the mobile radio station of maximum number is delivered, yet, when neighbor cell C5 will be above its second load threshold, do not make Serving cell be lower than its second load threshold simultaneously.
Refer again to step 202,, on step 210, check that whether the communications traffic load of current area is low, just be lower than second load threshold if current sub-district does not have high message volume.If message volume is not low, just think that this method proceeds to step 207 normally.Processed if not all sub-districts, on step 208, select the next sub-district in the sequence of cells, and handle according to the CLS method.Yet, if in step 210, think that communications traffic load is low, determine in step 211, the covering of described first sub-district is changed at least one direction from neighbor cell, just the biasing and thereby cell boarder since CLS be changed in the past, in step 212, the original cell boarder of current area is rebuilt.Thereby, correspondingly reduced in company with the neighbor cell of current service cell change or the covering of some sub-districts in the past.Otherwise if the covering of described first sub-district is not changed, this method proceeds to step 207.
If in long-time, grew the predetermined time cycle, the sub-district covers and is changed, and Cellular Networks correctly do not planned, because, for example change of communications traffic load in this zone.Therefore, rearranging plot planning needs.In another embodiment of the invention, provide a kind of timer arrangement, indicate the time of rearranging plot planning.For example, when comprising MSB, when the calling of C and D was terminated, the grade that takies of sub-district C4 was lower than first load threshold, then can rebuild C4, and the sub-district of C5 and C7 covers.Thereby, the offset parameter of sub-district C4, thus cell boarder is moved, not only with respect to sub-district C5 but also with respect to sub-district C7.Therefore, in step 212, the sub-district of Serving cell C4 covers and is increased, by the border is moved, extending the sub-district of reducing neighbor cell C5 from Serving cell C4 between point 2 ' and point 3 ' covers, in step 213,, between point 4 ' and point 5 ', extend the sub-district of reducing neighbor cell C7 from Serving cell C4 and cover by moving second border.Then, as a result of, extend between original point 2 and 3 on first border, and second border is other original in extending between putting 4 and 5.In current system, this is by changing sub-district C4 and C5 respectively, and the biasing between C4 and the C7 obtains.
In another embodiment of the present invention, be not to use signal strength signal intensity to determine the position of mobile radio station with respect to cell boarder.This is by means of independent navigation system, and global positioning system (GPS) is for example perhaps utilized the measurement result of mobile system, and for example timing advance (TA) is realized.When the position of MS is when calculating by MS itself, data can be sent to system (MSC/BSC) by Short Message Service (SMS) or by destructuring assistant service data (USSD).
According to base station in service sector (C4) and neighbor cell base station (C1, C2, C3, C5, C6, C7) current biasing, position data and the power that is sent, the position of cell boarder is by based on known radio propagation model prediction.Distance from each MS to each cell boarder is calculated, and the CLS method is by carrying out with the similar mode of the embodiment of foundation front.For " quantity " that move on the calculation plot border, utilize known radio propagation model once more, will be apart from converting the offset change of calculating with dB to.
Though described the present invention by specific embodiment, should be clear, the invention provides a kind of method and system that cell load is shared that in the cellular mobile radio communication system, is used for, it satisfies target set forth above and advantage fully, the scheme that it substitutes is revised and modification is obvious for those skilled in the art.
With respect to known technology, the present invention advises a kind of quicker, thereby also is the communications traffic load that more efficient methods is used to share the minizone.This method has been described the border and should have been moved towards which neighbor cell, and how many borders should move.Keeping aspect known technology good, reaching this purpose in the time of for example to the stability of vibration.
Air interface between MS and BS will not change, and this causes MS not need to revise.
This problem should be applicable to other cellular system, WCDMA for example, and this is still in the scope of the present invention of patent protection.

Claims (23)

  1. One kind in cellular mobile radio system first sub-district (C4) and its neighbor cell (C1, C2, C3, C5, C6, C7) between the method for load sharing, wherein each sub-district serve many mobile radio stations (1, A, B, C D), is characterized in that following steps:
    The communications traffic load that determines whether described first sub-district (C4) is higher than first load threshold (201,202); If,
    Determine whether neighbor cell (C1, C2, C3, C5, C6, communications traffic load C7) is lower than second load threshold (203); If,
    (C2, C5 C7) select at least one neighbor cell (C5 from neighbor cell with the communications traffic load that is lower than described second load threshold; C7), it have the mobile radio station of high number (B, C) relevant with described first sub-district (C4), have the signal strength signal intensity (204) that is higher than signal strength threshold;
    Increase described at least one neighbor cell (C5 towards described first sub-district (C4); C7) sub-district covers (205); With
    Leaving described at least one neighbor cell (C5; The sub-district of reducing described first sub-district (C4) on the direction C7) covers corresponding degree (206).
  2. 2. according to the method for claim 1, it is characterized in that, increasing described at least one neighbor cell (C5 towards described first sub-district (C4); C7) sub-district covers before the step, also has such step;
    If two or more neighbor cell (C5 are arranged, C7), they have the mobile radio station of high number, relevant with described first sub-district (C4), has the signal strength signal intensity (204) that is higher than described signal strength threshold, select at least one neighbor cell in order, report first neighbor cell (C5) of catalogue from the MS that is stored in described first sub-district (C4).
  3. 3. according to the method for claim 1, it is characterized in that, increasing described at least one neighbor cell (C5 towards described first sub-district (C4); C7) before the step that sub-district covers, also have following step:
    If two or more neighbor cells are arranged, and (C5 C7) has the signal strength measurement of high, selects at least one neighbor cell in order, from having the sub-district (C7) of the idle communication traffic channel of high number.
  4. 4. according to each the method in the claim of front, it is characterized in that, increasing described at least one neighbor cell (C5 towards described first sub-district (C4); C7) sub-district covers before the step, also has following step:
    Determine (C7) sub-district covers change what for C4, C5, becomes and is lower than described first load threshold so that reduce the communications traffic load of described first sub-district (C4) in each sub-district.
  5. 5. according to the method for claim 4, it is characterized in that the variation that the sub-district covers is measured with dB, the dB number of the sub-district covering of wherein specific increase/minimizings first sub-district (C4) and described at least one respective cell (C5 of minimizing/increase correspondingly; C7) sub-district covers described first sub-district (C4) and described neighbor cell (C5; C7) mobile radio station that causes given number between is delivered.
  6. 6. according to the method for claim 4 or 5, it is characterized in that described at least one neighbor cell (C5; C7) sub-district covers is increased (205) towards described first sub-district (C4), so that receive many mobile radio stations at described neighbor cell, be up to the greatest level of its first load threshold.
  7. 7. according to the method for claim 4 or 5, it is characterized in that described at least one neighbor cell (C5; C7) sub-district covers is increased (205) towards described first sub-district (C4), so that at described neighbor cell (C5; C7) receive many mobile radio stations, the neighbor cell (C5 that makes first sub-district (C4) and receive; C7) load is balanced into equal.
  8. 8. according to the method for claim 4 or 5, it is characterized in that described at least one neighbor cell (C5; C7) sub-district covers is increased (205) towards described first sub-district (C4), so that at described neighbor cell (C5, C7) receive many mobile radio stations, (C5, C7) load in is lower than its first load threshold and is higher than its second load threshold to be implemented in neighbor cell.
  9. 9. according to the method for claim 4 or 5, it is characterized in that being described at least one neighbor cell (C5; C7) sub-district covers is increased (205) towards described first sub-district (C4), so that at described neighbor cell (C5; C7) receive many mobile radio stations, as adjacent sub-district (C5; C7) do not make Serving cell (C4) be lower than its second load threshold in the time of will be above its second load threshold.
  10. 10. according to each method in the claim of front, it is characterized in that determine whether neighbor cell (C1, C2, C3, C5, C6, communications traffic load C7) is lower than before the step of second load threshold (203), also has following step:
    Determine whether that the communication service of described first sub-district (C4) is lower than its second load threshold (210); If,
    The covering that determines whether described first sub-district is with respect at least one neighbor cell (C5; C7) done change (211); If,
    Towards described at least one neighbor cell (C5; C7) covering (212) of increase by first sub-district; With
    Correspondingly, reduce described at least one neighbor cell (C5; C7) covering (213).
  11. 11., it is characterized in that covering by being modified in the sub-district that signal strength signal intensity relation between first sub-district (C4) and the neighbor cell (C5) changes a sub-district according to each method in the claim of front.
  12. 12., it is characterized in that further step according to each method in the claim of front:
    Whether checking that the sub-district covers during the time cycle of predesignating is changed, if,
    Produce a signal, indicating rearranging of plot planning needs.
  13. 13. the sub-district adjacent, first sub-district (C4) in cellular mobile radio system with it (C1, C2, C3, C5, C6, C7) between the method for load sharing, wherein each sub-district serve many mobile radio stations (1, A, B, C D), is characterized in that following steps:
    The communications traffic load that determines whether described first sub-district (C4) is higher than first load threshold (201,202); If,
    Determine be stagnate neighbor cell (C1, C2, C3, C5, C6, communications traffic load C7) is lower than second load threshold (203); If,
    (C2, C5 C7) select at least one neighbor cell (C5 from neighbor cell with the communications traffic load that is lower than described second load threshold; C7), it have the mobile radio station of high number (B, C) relevant with described first sub-district (C4), leaving first sub-district (C4) and described at least one neighbor cell (C5; In the distance threshold of the cell boarder C7) (204);
    Increase described at least one neighbor cell (C5 towards described first sub-district (C4); C7) sub-district covers (205); With
    Leaving described at least one neighbor cell (C5; The sub-district of reducing described first sub-district (C4) in the direction C7) covers corresponding degree (206).
  14. 14. the method according to claim 13 is characterized in that, is increasing described at least one neighbor cell (C5 towards described first sub-district (C4); C7) before the step that sub-district covers, also have following steps:
    If two or more neighbor cell (C5 are arranged; C7) has the mobile radio station of high number, relevant with described first sub-district (C4), be positioned at described distance threshold (204), select at least one neighbor cell in order, first neighbor cell (C5) beginning from the MS report catalogue that is stored in described first sub-district (C4).
  15. 15., it is characterized in that increasing described at least one neighbor cell (C5 towards described first sub-district (C4) according to the method for claim 13; C7) before the step (205) that sub-district covers, also have following steps:
    If two or more neighbor cell (C5 are arranged; C7) have the mobile radio station of high number, be positioned at described distance threshold, select at least one neighbor cell in order, from having the sub-district (C7) of the communication traffic channel of high number free time.
  16. 16., it is characterized in that increasing described at least one neighbor cell (C5 towards described first sub-district (C4) according to each method among the claim 13-15; C7) before the step (205) that sub-district covers, also have following steps:
    Determine (C7) sub-district covers change what for C4, C5, becomes and is lower than described first load threshold so that reduce the communications traffic load of described first sub-district in each sub-district.
  17. 17. method according to claim 16, it is characterized in that the variation that the sub-district covers measures with long measure, wherein the sub-district of first sub-district (C4) is covered the specific distance of increase/minimizing specifically and described at least one neighbor cell (C5 of minimizing/increase correspondingly; C7) sub-district covers, and makes at described first sub-district (C4) and described neighbor cell (C5; C7) produce delivering of given number mobile radio station between.
  18. 18., it is characterized in that described at least one neighbor cell (C5 according to the method for claim 16 or 17; C7) sub-district covers is increased (205) towards described first sub-district (C4), so that at described neighbor cell (C5; C7) receive many mobile radio stations, the most nearly the greatest level of its first load threshold.
  19. 19., it is characterized in that described at least one neighbor cell (C5 according to the method for claim 16 or 17; C7) sub-district covers is increased (205) towards described first sub-district (C4), so that at described neighbor cell (C5; C7) receive many mobile radio stations, the neighbor cell (C5 that makes the sub-district of winning (C4) and receive; C7) load is balanced into equal.
  20. 20. the method according to claim 16 or 17 is characterized in that, described at least one neighbor cell (C5; C7) sub-district covers is increased (205 ') towards described first sub-district (C4), so that at described neighbor cell (C5; C7) receive many mobile radio stations, at neighbor cell (C5; C7) first load threshold that obtains to be lower than it in is higher than the load of its second load threshold.
  21. 21., it is characterized in that described at least one neighbor cell (C5 according to the method for claim 16 or 17; C7) sub-district covers is increased (205) towards described first sub-district (C4), so that at described neighbor cell (C5; C7) receive many mobile radio stations, make as neighbor cell (C5; C7) do not make Serving cell (C4) be lower than its second load threshold in the time of will be above its second load threshold.
  22. 22. according to each method among the claim 13-21, it is characterized in that determine whether neighbor cell (C1, C2, C3, C5, C6, communications traffic load C7) is lower than before the step (203) of second load threshold, also has following steps:
    Determine whether that the communications traffic load of described first sub-district (C4) is lower than its second load threshold (210); If,
    The covering that determines whether described first sub-district (C4) is with respect at least one neighbor cell (C5; C7) change (211); If,
    Towards described at least one neighbor cell (C5; C7) covering (212) of increase by first sub-district; With
    Correspondingly, reduce described at least one neighbor cell (C5; C7) covering (213).
  23. 23., it is characterized in that following steps according to each method among the claim 13-22:
    Whether checking that the sub-district covers during the predetermined time cycle is changed, if,
    Produce a signal, indicating rearranging of plot planning needs.
CN00807892A 1999-05-21 2000-05-18 Method for cell load sharing in a cellular mobile radio communicaltions system Pending CN1351806A (en)

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