CN1083989A - Make the optimized method of selection of cellular telephone network channel - Google Patents
Make the optimized method of selection of cellular telephone network channel Download PDFInfo
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- CN1083989A CN1083989A CN 93109372 CN93109372A CN1083989A CN 1083989 A CN1083989 A CN 1083989A CN 93109372 CN93109372 CN 93109372 CN 93109372 A CN93109372 A CN 93109372A CN 1083989 A CN1083989 A CN 1083989A
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- H04—ELECTRIC COMMUNICATION TECHNIQUE
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Abstract
A kind of making selects the same frequency channel to reach method for optimizing for the process that other place in the network re-uses in the cellular telephone network, and this method is a kind of statistic law.The sum that gathers the fixed all subregion of signal strength signal intensity with regard to each honeycomb scene of network, it is compared greater than the subregion of minimum acceptable value with actual CIR, thus the probability that the signal at other honeycomb scene is disturbed in one or more receipts automatic networks in this honeycomb when determining to re-use the cochannel frequency.So just provide to make channel select to reach optimized a kind of method, as long as promptly choose the channel of the possibility minimum that the signal that uses other honeycomb of cochannel frequency in the automatic network disturbed.
Description
The present invention relates to the cellular telephone network, mainly but be not only relate to this network partly or entirely among the optimization of selection of channel disturb so that reduce to greatest extent, enlarge the performance and the ability of network to greatest extent.
The cellular telephone network is based on such understanding generation, promptly from view angle of statistics, the users of this telephone system can not be in geographical position close to each other and/or can not same at one time place make a phone call or receive phone at any given time.
The number of the existing available radio channel of assumed wireless telephone network is limited, has then had the honeycomb-like network system just can carry out number of times very many calling or receipt of call with the channel of negligible amounts at one time.For reaching this purpose, install many short-range transmitter and receiver in the whole zone that telephone network covered with cellular structure, the radio frequency band of each honeycomb (cell) of honeycomb is different with adjacent honeycomb, but often identical with some other honeycomb in the network.
Though each the radio transmitter coverage distance in each honeycomb is shorter, be understood that the signal of any specific channel still might be searched by the receiver of reusing same channel near each honeycomb, thereby causes " cross-talk " in the telephone relation process.For reducing this undesirable effect to greatest extent, the signal strength signal intensity that need guarantee to adopt near the honeycomb of same channel to send should be littler as to be enough to distinguish the signal more weak with reject than the signal strength signal intensity of employed same channel in specific honeycomb, thereby only use stronger signal in the process of telephone relation.For reaching this purpose, quoted this notion of Carrier interference ratio (CIR) when setting up honeycomb-like radio system, its basic definition is exactly: the carrier signal strength of a certain honeycomb and the ratio of receipts near the interference signal intensity of the honeycomb of the same channel frequency of employing.
For simplicity, CIR also can represent with decibel, and at this moment the measurement unit of actual signal intensity is watt.Therefore, if the intensity of certain channel carrier signal is for example C=10 * 10 after measured
-7Milliwatt, then C(represents with decibel) can be write as the logarithm of 10 unit's of multiply by milliwatt power ratios.So:
C (dBm)=10log (10 * 10-7 milliwatt)/(1 milliwatt) (1)
C（dBm）＝10log（10×10
-7）（2）
C（dBm）＝-60dBm（3）
Equally, some intensity of disturbing channel I is for example 5 * 10
-7Milliwatt then draws the following relationship formula:
I (dBm)-10log (5 * 10-7 milliwatt)/(1 milliwatt) (4)
I（dBm）-10log（5×10
-7）（5）
I（dBm）＝-63dBm（6）
And in view of CIR=10log((10 * 10-7 milliwatt)/(5 * 10-7 milliwatt)) (7)
And: CIR(dB)=10log((10 * 10
-7Milliwatt)/(1 milliwatt))-10log ((5 * 10
-7Milliwatt)/(1 milliwatt)) (8)
Thereby:
CIR（dB）＝C（dBm）-I（dBm）（9）
CIR（dB）＝-60dBm-（-63dBm）（10）
CIR（dB）＝3dB
Like this, as can be seen, if carrier wave and disturb intensity of wave with a watt expression, then CIR is exactly 10 times of its log-of-ratio, shown in (7) formula; And if carrier wave and interference intensity of wave are measured with dBm, then CIR can obtain by the difference of calculating them, shown in (10) formula.
In general, in cellular mobile radio analogue system, CIR is greater than 17 decibels in this class network requirement, but is understood that, this value is optional, distinguishes the ability of receiving from same channel but being located at each signal in the different honeycomb according to the technology that adopts in the use hardware and its and selects.
In ideal conditions, cellular telephone Network Design task is more flat-footed, needed only is some short-range radio stations, there are some emittor/receivers in this radio station, often adopt common antenna, spread all over the desired whole geographic area of network and equidistantly dispose, each determines the on-the-spot center (cell site centre) of its each honeycomb by this class radio station.Under these circumstances, normally outside propagation spherical in shape of electromagnetic radiation, this must mean: if settle with respect to adjacent radio with effective and efficient manner in each radio station, then each honeycomb is understood some overlay configuration.Though the real trace of the signal that can receive from each broadcasting station transmitter is a circle around antenna; but it is comparatively convenient to consider still that usually each honeycomb is a kind of like this ideal situation of hexagon; and when this network of design; it is comparatively convenient to adopt the hexagon honeycomb to draft network distribution geographically, and each honeycomb just shows to such an extent that interlock with each honeycomb that adjoins like this.
Under the situation about mentioning in the above, in fact mainly when obviously designing the geographic range of this telephone system only consider more like this, i.e. the installation and operation expense in each radio station in each honeycomb of compromise selection, and this is opposite with the requirement of each honeycomb Interworking Telephone with the end user.Therefore, honeycomb is far away more apart from densely populated center geographically, and the cost effectiveness that keeps in repair and manage a honeycomb from this position is just more little.Therefore the design of this ideal network is more flat-footed.
Yet in real world, also having many other complicated factors, wherein mainly is the factor affecting cellular telephone Network Design that geomorphology and demography cause, promptly can not find the desirable place of settling each radio station.The geomorphology factor produces in the cities and towns of the natural feature with many high-rises and/or massif and mountain valley one class often.The demography factor be because of the density of population particularly around the cities and towns variation of the density of population cause.
Landform changes the problem cause can be summed up as such meaning usually, can not think that promptly the desirable hexagon of honeycomb is proper, does not go out the radio-frequency radiation ripple because of the existence of building etc. can not receive or sends because have some positions in this honeycomb.This problem can solve by setting up some additional radio station that cover blind area in the honeycomb, wishes that these radio station are with economic way setting as far as possible.Sometimes even need particularly fix up an aerial wire in shopping center etc. and so in building, at this, the user of telephone network wants to converse or to receive the statistics probability of phone very high with phone.Not so also can in each honeycomb, adopt more than one antenna, but be placed in waypoints different in the honeycomb,, thereby under the situation that is subjected to the landform restriction, reach comprehensive coverage condition as far as possible with each discrete segments of covering honeycomb.Like this, each honeycomb just can provide service by single radio station, perhaps each honeycomb is divided into some honeycomb segmentations, and each segmentation has the antenna of oneself, but all works under same bandwidth.
Demographic factor also this network design is become play a part aspect complicated certain, because the zone that the density of population is big thinks that in order to guarantee the caller can make a phone call, the people that should answer the call can receive phone, obviously requires more channel to use for them.Since it is limited can distributing to the number of channel of cellular telephone network use usually, thereby obviously need be effectively that network design is good, so that can maximally utilise existing spendable channel as far as possible.
At present, the method that adopted of cellular telephone network design normally relies on trial/theory of error rather than use more scientific methods (then making an exception) when the variation of landform and demographic aspect is little.Even in process pains and well-designed so that maximally utilise in the network of existing spendable channel number, still often need be according to the design of removing to check and adjust honeycomb in the network with the dismounting of old building of building up of new building.When the variation of landform or demographic aspect is little, sometimes can deal with by setting up some radio station at some key positions, but As time goes on, from the effect of accumulation, sometimes position by changing various radio station or number or change divide task their channel and thoroughly redesign network may be more effective or more economical.
As usual, for realizing that allocated channel is for adjoining the preferred plan that each honeycomb re-uses, always be the radio-frequency (RF) signal strength contour map of analyzing each honeycomb by naked eyes, thereby and rule of thumb judge in selecting the process of the some signals that may reuse whether re-use certain particular channel by the contour map of more a certain honeycomb and another honeycomb.
Obviously,, then can reach the degree that to allow, thereby the channel that re-uses same frequency is unpractical in view of interference if a certain honeycomb receives the radio-frequency radiation ripple of coming in quite most, that signal strength signal intensity is higher from the honeycomb that adjoins., when the contour value figure of radio frequency of each honeycomb relatively so that determine: in any known honeycomb, have which channel to make the time spent again disturbing under the condition of adjoining each honeycomb that adopts same channel as small as possible, just had any problem.Can know from the radio frequency contour map and to know that some particular channel is not suitable for re-using, and that on the other hand some other channel is owing to cause that the chance of interference is very little or can not produce and disturb and can re-use.There are a series of possibilities at these two between extreme, thereby need logarithm value to judge to determine which channel can reallocate or re-use.
The present invention attempts to solve for the selection problem of adjoining each channel that each honeycomb re-uses, and method is to quote some can provide the more Statistics of scientific methods to selection course.Specifically, the present invention has weighed effectively: (1) uses the honeycomb that adjoins of same frequency can 100% ground to produce the worst case disturbed and (2) confidence level (level of confindence) when re-using each channel without any the situation of interference between these two, and then being in the latter case has 100% the assurance Shi Buhui that can make a phone call certainly or answer the call to be disturbed.Adopt this principle of the inventive method just can determine the confidence level of all channels in the network, thereby when needing to select which signal to re-use, just can carry out with reference to from 0% to 100% confidence level for other each honeycomb with respect to each honeycomb.
According to the present invention, providing so a kind ofly makes the selection of radio telephone network channel reach optimized method, used in this network and a plurality ofly be the radio station that the emittor/receiver of cellular configuration and some antennas constitute by some, this method comprises following each step:
(a) determine the minimum permissible range of the Carrier interference ratio (CIR) of network;
(b) geographic area that network covered is divided into again many little, be identical shaped and big or small subregion usually;
(c) intensity of determining to come the signal of the transmitter in each radio station in the automatic network of at least one position in all perhaps many subregions;
(d) for each above-mentioned subregion and each transmitter, the mean value of stipulate the above-mentioned signal strength signal intensity that is determined is represented the average signal strength of the interior transmitter of all each several parts of this subregion;
(e) emission source of this signal that will be the strongest is defined as the on-the-spot center (serving cell-site centre) of honeycomb that this subregion provides service, and this signal itself is decided to be carrier signal;
(f) all the other are come the sort signal of other transmitter is defined as interference signal in the automatic network, and use it for the CIR of each calculating about the carrier signal of this subregion;
(g) number of the subregion that each honeycomb on-site signal intensity has been determined in the statistics network, the total sum that again its CIR is surpassed all subregion in number and the honeycomb scene of all subregion of minimum acceptable value compares, thus definite probability that when re-using same channel, can not influence the signal at other honeycomb scene in one or more receipts automatic networks in this honeycomb; And
(h) when selecting a certain channel when using in a certain honeycomb, selection has the channel of minimum probability for the interference of the signal of the honeycomb that adopts same channel from other, thereby makes the selection of channel reach optimization.
Self-evident, one or more steps of being mentioned in above-mentioned and the application's claims can be exchanged, for example, as if finding that definite earlier the receipts from definite thus then all subregion of the signal value of various transmitters and honeycomb scene talked about more easily in variant position, then can do like this.Therefore, method of the present invention is also unrestricted on its order, equally, obvious method of the present invention in addition in the network of new network or redesign fully and wherein each existing honeycomb scene do not distributed as yet in the fixed network, also can carry out the optimization that channel is selected.
If signal strength signal intensity only determines once at all subregion that then obviously each value also is a mean value, thereby the step that need not to average separately.
For the various channels of variant position in the network, its signal strength signal intensity can be determined by directly measuring, and also can determine by predicted method, for example calculates the possible propagation condition of radio-frequency radiation with Mathematical Modeling.But in the big city of high-rise density, it is extreme complicated that the mathematical computations of radio-frequency propagation becomes, and therefore preferably adopts directly in the case and measure.
When particularly when being applied to wireless telephony network in the city and carrying out optimization that channel selects, the subregion layer that preferably geographic area that network covered is divided again forming shape and size usually to equate is so that adapt to the variation that radio-frequency propagation causes because of building or other landform.For example, certain one deck can be corresponding to ground level, and another layer can so be analogized corresponding to the first floor on the ground level for example.So just the abnormal conditions of radio-frequency propagation vertical direction can be taken into account, and adjust the selection course of channel in case of necessity.
For simplicity, the area that can adopt trellis system to divide network again to be covered (using warp and parallel) determining the scope of all subregion, and when adopting more than one area level, a grid directly can be overlapped onto on another grid.
When re-using same channel in any specific honeycomb, the confidence level of the most handy scope of disturbing for the generation of receiving one or more signals at some other honeycomb scene in the automatic network of probability from 0% to 100% is represented, 0% confidence level represents that any position that 100% confidence level is illustrated in the honeycomb position can not be interfered whenever being interfered when make a phone call in any position at honeycomb scene.So just can calculate the confidence level level that in whole network any position re-uses a certain channel, and show with the form of a look-up table, like this, for any one channel in the spendable channel of hundreds of individual possibilities in the network, according to the geographical position that it identified, all there is the multiple selection that whether can re-use any particular channel, wherein the confidence level that re-uses of some channel is low, and the confidence level height that other re-uses, may be near 100%.
The benefit of this system is not rely on the correlation intuition interpretation of contour map frequently, and more is to rely on by direct mensuration or the statistics that calculates.
Referring now to accompanying drawing, method of the present invention only is described by way of example.In the accompanying drawing:
Fig. 1 is the radio contour map at honeycomb scene in the normal cellular shape telephone network;
Fig. 2 is the radio coverage figure at Fig. 1 honeycomb scene;
Fig. 3 is the block diagram of each relevant key step of expression the inventive method;
Fig. 4 simplifies schematic diagram, wherein shows in the network and many transmitters of each position, wherein its signal strength signal intensity is measured, and this schematic diagram comprises various for spreading all over the subregion that graticule defined of the whole regional extent of network;
Fig. 5 is and similar another schematic diagram of Fig. 4, but two-layer subregion is wherein being defined by graticule;
Fig. 6 is the list of the signal strength measuring value that diverse location is measured in subregion;
Fig. 7 is the list of Fig. 6 signal strength signal intensity mean value;
Fig. 8 is the list that the probability that is interfered during the same channel of various honeycomb field by using in network is represented with percentage;
Fig. 9 is the probability distribution curve of two a collection of CIR between the transmitter;
Figure 10 is the cumulative probability distribution curve of Fig. 9 curve;
List and Fig. 8 of Figure 11 are suitable, but represent the probability that disturbs with decibel.
Referring to Fig. 1, there is shown the radio contour map that is positioned at the on-the-spot S1 of the honeycomb in incity, big city earlier, this big city high-rise stands in great numbers and/or has many lineaments, stops or hindered general spherical propagation of electromagnetic radiation as waves.Many clear areas are arranged among the figure, and these clear areas represent that generally there are many buildings in this district, or expression just can not enter the wherein zone of measured signal intensity originally.Can also see the position of other honeycomb scene S2, S3, S4 and S5 in the network among the figure.
If not because building and hypothesis landform are arranged is fully smooth, then contour map will demonstrate signal strength signal intensity and can reduce gradually according to depending primarily on apart from the speed of the distance of emission source.But its shape of typical contour map and the scope that in fact resemble among the figure to be drawn are normally random.It should be understood that, the variation of signal of having drawn of the contour map of Fig. 1 along with the distance of leaving the transmitter that is placed in the on-the-spot center of honeycomb, and each honeycomb scene contour on figure is can be different, thereby if many honeycomb scenes of adjoining are covered other above honeycomb scene, the synthetic contour map that then draws can be extreme complexity, thereby elusive.
The radio coverage figure of the on-the-spot S1 of honeycomb that is equivalent to Fig. 1 contour map has been shown among Fig. 2, but only showing that its signal is better than can be from adjoining those zones of the signal that each honeycomb receives, thereby the figure shows such zone, the on-the-spot S1 of honeycomb provides and radios telephone or required reigning signal strength signal intensity when connecing radio telephone therein.Said above, all generally acknowledged usually that in cellular flow-type radio analogue system, difference in signal strength need be greater than 17 decibels, and can distinguish the interference signal of the same frequency that carrier signal and other places sends to guarantee telephone plant in the honeycomb.
Forward Fig. 3 to, shown the functional-block diagram of using the preferred process of the present invention among the figure.As can be seen from the figure, first step can be undertaken by two kinds of methods: the perhaps direct intensity of measured signal, perhaps calculate the signal strength signal intensity of the variant point of whole network.Before this, elder generation is divided into many subregions again with the geographic range of network.And, can see the system that adopted with reference in the example shown in Figure 4, wherein the size of all subregion is all identical with shape.In practice, all subregion is in fact than drawn much smaller among Fig. 4, and the general size of coming out of measuring is 50 meters and takes advantage of 50 meters, can delimit out many subregions to each honeycomb of network like this.Usually, the number of delimiting the subregion that comes out is many more, and the statistical accuracy of the inventive method is just high more.The most handy parallel of grid and warp define, and all subregion also marks with latitude and longitude.
Can adopt the signal strength signal intensity predictability result of calculation that all subregion is carried out to the general flat terrain of containing the waters, its accuracy is fairly good, but along with landform and/or the increase of each distance of radio-station scrambling in the network, this result of calculation is just not too reliable.Therefore, in the city and peri-urban, directly the intensity of measured signal is compared with calculating more worth promotion, can adopt the special automobile that travels on highway for this reason, equipment so that in time determine automobile accurate geographic position in any place, and is measured signal strength signal intensity that receipts near transmitter send every certain spacing (for example 10 meters or 20 meters) with general instrument and exploration equipment, equipment on the automobile is noted each data automatically when running car, be provided with post analysis and use.This often means that the road that this automobile will can arrive along automobile in the whole network and other zone are to obtain the data of sufficient amount, data can be used as the basis of statistical method of the present invention.In the zone that automobile can not arrive, then can measure individually, perhaps adopt mathematical method, to determine the signal strength signal intensity roughly of those parts that can not arrive in network.The number of the subregion that is covered is big more, and the statistical accuracy of the inventive method is just high more.
After how no matter data collect, just can calculate the average signal strength of each transmitter in all subregion, the strongest emission source with this average signal is decided to be the on-the-spot center of honeycomb that this particular sub-area provides service then, thereby signal itself is decided to be carrier signal.Then remaining signal is decided to be interference signal, so just can be simply calculate Carrier interference ratio with regard to each disturbing wave of this subregion.Obviously, the geographic range of honeycomb comprises for the strongest all that subregion of the transmission signal of this honeycomb, but honeycomb itself can expand to other zone of not measuring.
So just known in each honeycomb all subregion with respect near the average CIR of each transmitter, thereby these average CIR not that to be higher than be exactly the CIR minimum acceptable value that is lower than network.At this moment calculate the sum of this class subregion for all known subregions of cir value in the honeycomb, with regard to each interference, determine to surpass the percentage of each cir value of minimum acceptable value then; Here it should be understood that in fact this percentage has reflected when re-use when adjoining the employed same channel of honeycomb the confidence level that whether may be disturbed in this honeycomb.Like this, when the channel of selecting desire Gong to re-use, only need choose and allow that the highest one of CIR percentage get final product, rather than resemble " search and feel " that rely on the method for traditional use the radio contour map and carry out.
Forward Fig. 4 now again to, can see, mensuration is to carry out on the variant point in plurality of sub zone (with " X " expression) under the layout of illustrated simplification, and has measured on each this point and correspond respectively to the signal of receipts from the transmitter of the on-the-spot S1 to S5 of honeycomb.As top theory is crossed, obtain the mean value of each transmitter signal strength of all subregion for each subregion, then the peak signal source is decided to be the on-the-spot center of honeycomb of this subregion.
In Fig. 5, by going up second layer grid and the two-dimensional lattice network is expanded into three-dimensional grid toward the covering of ground floor grid.Certainly, can adopt two-layer above grid, this depends on especially whether network middle-high building thing is general, but it should be understood that each the position measured signal intensity at the second layer and any continuous each layer is more difficult than measured signal intensity on ground level.
Forward Fig. 6 now to, there is shown list in a certain particular sub-area practical measurement of network result (representing) with dBm, measure and carried out altogether four times, this is that each is measured to 5 transmitters among the on-the-spot S1 to S5 of honeycomb, and this mensuration is to carry out on the variant position that parallel and warp are formed in subregion.In northern 22.309818 positions and eastern 114.169511 positions, the record value of the signal strength signal intensity of S1 transmitter is-90dBm that the record value of S2 is-115dBm that S3 is-109dBm that S4 is-114dBm that the rest may be inferred by analogy for it.
The mean value list of the data that gather and write down among Fig. 6 has been shown among Fig. 7, has comprised mean place in the table, also comprised the average signal strength of each transmitter of S1 to S5 certainly.In practice, most of networks have many transmitters at place, corresponding numerous radio station, thereby are to carry out a large amount of mensuration and calculating in order to spread all over whole network in fact, almost must carry out data processing with computer for this reason.
As top when illustrating with reference to Fig. 3 described, at this moment the average data of all subregion and other subregion in each honeycomb are carefully contrasted, if 100 sub regions are for example arranged in known honeycomb, and measurement result shows, in 90 sub regions of these subregions, relevant for the feasible value of the CIR that adjoins a transmitter less than 17 decibels, then this may represent: if re-use the same channel that adjoins honeycomb in this honeycomb, then the interference-free confidence level in any position has only 10% in this honeycomb.On the contrary, if have 90 sub regions to show after measured in 100 sub regions: less from the signal strength signal intensity of adjoining transmitter, so that CIR is higher than 17 decibels permissible level, and this is expression just: if re-use same channel in this honeycomb, then interference-free confidence level of most of the time is 90%.Obviously, more approach to reach at 100% o'clock, then confidence level is bigger, thereby can not be disturbed.
Just can represent the confidence level that each honeycomb in the network or honeycomb section re-use some channel with percentage and be listed as into a table so use these principles, can work out that a kind of look-up table as shown in Figure 8 thus.Can see that from this table each transmitter has all calculated with respect to the confidence level percentage of other transmitter in the network, according to expectation like that, the maximum transmitter of distance that those are separated from each other has higher confidence level usually, on the contrary, at a distance of nearer transmitter, its confidence level is lower each other.In this table, look at the transmitter of S1 earlier, can see that in accordance with regulations, the confidence level that itself can not be disturbed is 0% when re-using same channel.The transmitter at S2 place also is like this for itself.
Referring to the on-the-spot S3 in for example room, peak, it should be noted that the confidence level with respect to the on-the-spot S5 of honeycomb is 97%, in other words, if re-use same channel in S5, the whole subregion that then S3 covered has 97% can not be disturbed.On the contrary, the average probability that cross-talk takes place in the S3 area of coverage has only 3%.On the other hand,, can expect that then 95% the S5 area of coverage can not disturbed, have only 5% S3 district to be disturbed if S3 and S5 adopt same channel.
List shown in Fig. 8 for the needs that illustrate through having simplified, but should remember that regular phone network its dedicated channel in assigned radio-frequency region can reach more than 300.A metropolitan honeycomb scene may reach 100, and each all is assigned to many channels by the needs of user in each honeycomb, and this comprises by other honeycomb scene some channels that another place re-uses in network certainly.This point has illustrated attempts to make the selection of channel and cellular telephone network to reach the involved complexity of optimized various conventional method, has illustrated that also which channel is statistic law of the present invention should select when being redistributed to the another location and how the most effective carrying out can provide reliable basis aspect this distribution simultaneously.
Fig. 8 understands for example how the confidence level that re-uses each channel for whole network can be represented with percentage, but self-evident, also can adopt alternate manner to represent whether disturbed.Can see that from the percentage method of above introduction the confidence level of CIR is higher than 17 decibels feasible value.If confidence level for example be fixed to 90% predetermined allow percentage, can also use a decibel expression cir value so instead.The probability distribution curve of a collection of CIR data between two transmitters that are placed in two different honeycomb scenes in the network respectively has been shown among Fig. 9.Can see that from this example the probability of CIR far below 17 decibels is very little, on the contrary, CIR is also very little much larger than 35 decibels probability.The cir value major part is between about 20 decibels and 35 decibels.
When probability distribution curve shown in Figure 9 accumulation is showed, can draw curve shown in Figure 10, same, also have only the sample of fraction to contain cir value in this curve less than 17 decibels.The confidence level of the numeric representation 90% that distributes by 10% branch such as grade in the curve, the reading of its CIR is 23 decibels.Therefore, the numeric representation that distributes by branch such as 20%, 30% and 40% respectively of 80%, 70% and 60% confidence level.Cir value is big more, and confidence level is just high more.Use the hundredths method and select 10% once more for use, can represent Fig. 8 by different modes, as showing of Figure 11 as hundredths.From the table of Figure 11, can see, the same with the percentile situation of confidence level shown in Figure 8, confidence level is to represent with decibel now, and according to expectation is such, those each other at a distance of the level of farthest its decibel of transmitter than those nearer each other transmitter height, but because the variation that wireless propagation meeting causes because of the existence in building or waters, situation is not always as described above; The existence in waters has often enlarged radio frequency in following propagation distance that can reach of the situation of unlikely serious decline.Look at the transmitter at S1 place earlier, can find that with regard to itself with by definition, its CIR is 0 decibel.On the contrary, the CIR of S1 is 29 decibels, and in other words, if use same channel in these two honeycomb scenes, the risk of then being disturbed is little.
Claims (8)
1, a kind of optimized method of selection that makes the wireless telephony network channel has been used in this network and a plurality ofly has been the emittor/receiver of cellular configuration and the radio station that antenna constitutes by some, and this method comprises following each step:
(a) determine the minimum permissible range of the Carrier interference ratio (CIR) of network;
(b) geographic area that network covered is divided into again many little, be generally identical shaped and big or small subregion;
(c) signal strength signal intensity of determining to come the transmitter in each radio station in the automatic network of at least one position in all perhaps many subregions;
(d), stipulate that the above-mentioned mean value that is determined signal strength signal intensity represents the average signal strength of the interior transmitter of all parts of this subregion for each above-mentioned subregion and each transmitter;
(e) emission source of this signal that will be the strongest is defined as the on-the-spot center of honeycomb that this subregion provides service, and this signal itself is decided to be carrier signal;
(f) all the other are come the sort signal of other transmitter is defined as interference signal in the automatic network, and use it for the CIR of each calculating about the carrier signal of this subregion;
(g) number of the subregion that each honeycomb on-site signal intensity has been determined in the statistics network, the total sum that again its CIR is surpassed all subregion in number and the honeycomb scene of subregion of minimum acceptable value compares, thus definite probability that when re-using same channel, can not influence the signal at other honeycomb scene in one or more receipts automatic networks in this honeycomb; And
H) when selecting a certain channel when using in a certain honeycomb, selection has the channel of minimum probability for the interference of the signal of the honeycomb that adopts same channel from other, thereby makes the selection of channel reach optimization.
2, method according to claim 1 is characterized in that, all subregion adopts warp and parallel to mark all subregion by a trellis system and defined.
3, method according to claim 1 and 2 is characterized in that, is provided with to have subregion layer identical shaped and big or small but that separate in vertical direction usually.
4, according to the described method of above arbitrary claim, it is characterized in that, be illustrated in confidence level and used the probability that interference takes place in the honeycomb of other local employed same channel in the network.
5, method according to claim 4 is characterized in that, confidence level is represented with the form of look-up table.
According to claim 4 or 5 described methods, it is characterized in that 6, confidence level represents that with percentage 0% probability that is equivalent to be disturbed is big, 100% probability that is equivalent to be disturbed is minimum or equal zero.
According to claim 4 or 5 described methods, it is characterized in that 7, confidence level is represented with the cir value that is greater than or less than the cir value that the network minimum allows.
8, method according to claim 7 is characterized in that, confidence level is represented with decibel.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB9216044.9 | 1992-07-28 | ||
| GB9216044A GB2269298A (en) | 1992-07-28 | 1992-07-28 | Optimizing channel selection in cellular telephone networks |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1083989A true CN1083989A (en) | 1994-03-16 |
| CN1045037C CN1045037C (en) | 1999-09-08 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN93109372A Expired - Fee Related CN1045037C (en) | 1992-07-28 | 1993-07-28 | Method for optimizing selection to channel in telephone network |
Country Status (6)
| Country | Link |
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| EP (1) | EP0653128A1 (en) |
| CN (1) | CN1045037C (en) |
| AU (1) | AU4336793A (en) |
| GB (1) | GB2269298A (en) |
| TW (1) | TW267282B (en) |
| WO (1) | WO1994002995A1 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101895898A (en) * | 2010-07-13 | 2010-11-24 | 北京邮电大学 | Method and system for inspecting cell identical and adjacent frequency interference |
| CN101848540B (en) * | 2009-03-27 | 2014-03-12 | 中兴通讯股份有限公司 | Resource block interference estimation method and device |
Families Citing this family (21)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5873028A (en) * | 1994-10-24 | 1999-02-16 | Ntt Mobile Communications Network Inc. | Transmission power control apparatus and method in a mobile communication system |
| US5594940A (en) * | 1994-12-22 | 1997-01-14 | Motorola, Inc. | Statistically robust traffic modeling method and apparatus |
| US5737705A (en) * | 1995-02-28 | 1998-04-07 | Motorola, Inc. | Method and apparatus for frequency assignment of a base station |
| US5878328A (en) * | 1995-12-21 | 1999-03-02 | At&T Wireless Services, Inc. | Method and apparatus for wireless communication system organization |
| US6496700B1 (en) | 1996-04-04 | 2002-12-17 | At&T Wireless Services, Inc. | Method for determining organization parameters in a wireless communication system |
| US6405048B1 (en) | 1996-08-28 | 2002-06-11 | Telefonaktiebolaget L M Ericsson | Method and system for autonomously allocating frequencies to a radio system sharing frequencies with an overlapping macro radio system |
| US6009332A (en) * | 1996-08-28 | 1999-12-28 | Telefonaktiebolaget Lm Ericsson | Method and system for autonomously allocating a frequency hopping traffic channel in a private radio system |
| US5884145A (en) | 1996-08-28 | 1999-03-16 | Telefon Akmebolget Lm Ericsson | Method and system for autonomously allocating a cellular communications channel for communication between a cellular terminal and a telephone base station |
| FI106589B (en) | 1996-09-27 | 2001-02-28 | Nokia Networks Oy | Adaptive frequency planning in a cellular network |
| FI107502B (en) * | 1996-12-09 | 2001-08-15 | Nokia Networks Oy | A method for determining a frequency for use by a cellular radio system cell and a cellular radio system |
| SE512077C2 (en) * | 1997-01-22 | 2000-01-24 | Ericsson Telefon Ab L M | Method and apparatus for estimating the attenuation of a radio communication system |
| ATE317624T1 (en) * | 1997-04-10 | 2006-02-15 | Qualcomm Inc | DETERMINING THE LOCATION OF A SUBSCRIBER UNIT IN A MOBILE COMMUNICATIONS SYSTEM |
| US6021329A (en) * | 1997-05-01 | 2000-02-01 | Telefonaktie Bolaget Lm Ericsson (Publ) | Method, and associated apparatus, for determining cell relationships in a radio communication system |
| US6405043B1 (en) * | 1997-07-02 | 2002-06-11 | Scoreboard, Inc. | Method to characterize the prospective or actual level of interference at a point, in a sector, and throughout a cellular system |
| US6097957A (en) * | 1997-11-14 | 2000-08-01 | Motorola, Inc. | Radiotelephone service planning system and method for determining a best server for a communication connection |
| GB2332596B (en) * | 1997-12-17 | 2002-12-11 | Motorola Ltd | A method for predicting interference |
| FR2788132B1 (en) * | 1998-12-31 | 2001-03-02 | Telediffusion Fse | DETERMINATION OF RADIO TRANSMITTER COVERAGE |
| FR2800964B1 (en) * | 1999-11-04 | 2002-02-01 | Telediffusion Fse | METHOD FOR VALIDATING THE ALLOCATION OF TELECOMMUNICATIONS NETWORK FREQUENCY PLANS |
| EP1189467B1 (en) * | 2000-09-14 | 2008-03-05 | Allen Telecom, LLC | A method to characterize the prospective or actual level of interference at a point, in a sector and throughout a cellular system |
| EP1882374A4 (en) * | 2005-05-17 | 2008-05-21 | Andrew Corp | Method and apparatus for determining coupled path loss |
| US8195171B2 (en) | 2005-12-21 | 2012-06-05 | Telecom Italia S.P.A. | Method for estimating a radio coverage of a geographic area in a cellular mobile radio communication network |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SE465146B (en) * | 1989-03-03 | 1991-07-29 | Televerket | METHOD FOR DISTRIBUTING A GIVEN NUMBER OF RADIO CHANNELS IN A RADIO SYSTEM |
| JPH02312492A (en) * | 1989-05-29 | 1990-12-27 | Nec Corp | Channel assignment method in mobile communication system and learning system for base station arrangement information |
| SE465004B (en) * | 1989-12-18 | 1991-07-08 | Televerket | METHOD FOR DETERMINING MULTIPLE INTERFERENCES IN A MOBILE RADIO SYSTEM |
-
1992
- 1992-07-28 GB GB9216044A patent/GB2269298A/en not_active Withdrawn
-
1993
- 1993-05-28 EP EP93913234A patent/EP0653128A1/en not_active Withdrawn
- 1993-05-28 WO PCT/GB1993/001126 patent/WO1994002995A1/en not_active Application Discontinuation
- 1993-05-28 AU AU43367/93A patent/AU4336793A/en not_active Abandoned
- 1993-07-15 TW TW82105651A patent/TW267282B/zh active
- 1993-07-28 CN CN93109372A patent/CN1045037C/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101848540B (en) * | 2009-03-27 | 2014-03-12 | 中兴通讯股份有限公司 | Resource block interference estimation method and device |
| CN101895898A (en) * | 2010-07-13 | 2010-11-24 | 北京邮电大学 | Method and system for inspecting cell identical and adjacent frequency interference |
| CN101895898B (en) * | 2010-07-13 | 2012-10-10 | 北京邮电大学 | Method and system for inspecting cell identical and adjacent frequency interference |
Also Published As
| Publication number | Publication date |
|---|---|
| GB9216044D0 (en) | 1992-09-09 |
| AU4336793A (en) | 1994-02-14 |
| GB2269298A (en) | 1994-02-02 |
| TW267282B (en) | 1996-01-01 |
| CN1045037C (en) | 1999-09-08 |
| EP0653128A1 (en) | 1995-05-17 |
| WO1994002995A1 (en) | 1994-02-03 |
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