CN100461930C - Method for optimizing the positioning of high sensitivity receiver front-ends in a mobile telephony network and related mobile telephony network - Google Patents

Abstract

The present invention relates to a method for optimizing the positioning of high sensitivity receiver front-ends in a mobile telephony network of the CDMA type comprsing a plurality of cells. The method comprises the following steps: defining a first and a second cell indicator V>cell<, V>2<; defining a firt and a second threshold value L and L>2<; comparing said first cell indicator V>cell< with a first threshold value L and said second cell indicator V>2< with a second threshold value L>2<; associating with a first category a plurality of first cells 2>a< having said first cell indicator V>cell< greater than said first threshold value L or said second cell indicator V>2< greater than said second threshold value L>2<; positioning a plurality of high sensitivity receiver front-ends 5 substantially in all said plurality of first cells 2>a<. The method further comprises the steps of: associating with a second category a plurality of second cells 2>b< having said first cell indicator V>2< small than said first threshold.

Description

Be used for optimizing method and the relevant mobile telephone network of high sensitivity receiver front-ends in the location of mobile telephone network

The present invention relates generally to field of mobile telephony, and relate in particular to the mobile telephone network that CDMA type (＂ code division multiple access ＂) (being W-CDMA or CDMA 2000 or UMTS at this) inserts.More particularly, the present invention relates to a kind of method and the relevant mobile telephone network of high sensitivity receiver front-ends that be used for optimizing in the location of mobile telephone network.

In mobile telephone network, the geographic area is subdivided into a plurality of sub-districts.Network traffic in each sub-district by be used for to/handle from the base station transceiver of portable terminal emission and/or receive radio signals (voice and/or data).These base station transceivers can have the receiver front end that is inserted in the transceiver antenna downstream, and its major function is selection and amplifies those radio signal and all other possibility interference signals that decay in being of value to the frequency range of communication.

Usually, the communication of (uplink channel) characterizes by having quite lower powered radio signal from the portable terminal to the base station transceiver.Therefore these radio signals are worsened when noise exists.

As at United States Patent (USP) 6,263, in 215 disclosed like that, in order to significantly improve signal to noise ratio and therefore to improve the sensitivity of base station transceiver when receiving by the portable terminal emitted radio signal, these base stations can be equipped with the low temperature receiver front end.

As M.I.Salkola at ＂ CDMA Capacity-Can You Supersize That? ＂ (2002 IEEE Wireless Communications and Networking ConferenceRecord, WCNC 2002 (Cat.No.02TH8609), the 2nd volume, the 768-73 page or leaf) described in, the application of the low temperature receiver front end of base station transceiver has a direct impact the performance of mobile telephone network, is because it can make it improve its capacity.

In addition, as D.Jedamzik, R.Menolascino, M.Pizarroso, B.Salas at ＂ Evaluation of HTS sub-systems for cellular base stations ＂ (1999IEEE Transactions on Applied Superconductivity, the 9th the 2nd phase of volume, pt.3, the 4022-5 page or leaf) described in, two kinds of schemes are arranged, wherein under the situation of GSM type network, operator can find the characteristic of the base station transceiver that is equipped with the front end made from superconductor interesting.These two kinds of schemes are corresponding to a scheme (low traffic situation, wherein coverage is a limiting factor) and a limited scheme (heavy traffic environment, wherein the traffic carrying capacity that provides is a limiting factor) of capacity that coverage is limited.The limited scheme of coverage is corresponding to the environment in suburb, and the stronger sensitivity that wherein is equipped with the base station transceiver of the front end made from superconductor makes it can obtain the expansion of each cell footprint.The limited scheme of capacity is corresponding to the environment in urban district, and wherein because the result of the better isolation between the carrier wave that it provides, the base station transceiver that is equipped with the front end made from superconductor will allow channeling closely.

For these two kinds of schemes each, produce and analyze two network designs in mode relatively.First network design is all become by the standard groups of base transceiver stations, and second network design is all become by the groups of base transceiver stations that is equipped with the front end made from superconductor.

Some results have been presented for GSM-1800 type network.Especially, these results show that Virtual network operator can select to utilize different advantages; For example, carrier synchronization reduced by 30% o'clock, the base station transceiver decreased number 24% in the suburb, and perhaps the capacity in the urban district increases.

, above-mentioned file does not provide the univocal connotation of term ＂ urban district ＂ and ＂ suburb ＂.

In addition, the applicant has been noted that: for the standard base station transceiver, the advantage of listing in this file (particularly for the urban district) links together with the spectral selectivity of the improvement of the base station transceiver that is equipped with the front end made from superconductor.Spectral selectivity particular importance under the GSM network condition of improving.

In the remainder of this specification and claim, we are defined as high sensitivity receiver front-ends having the front end of overall noise index less than 2dB (more preferably less than 1dB, more preferably less than 0.7dB).Preferably, from short distance of transceiver antenna high sensitivity receiver front-ends is being installed.Preferably, high sensitivity receiver front-ends comprises at least with the interconnective filter of cascade arrangement form and an amplifier.Preferably, filter and amplifier are operated under cryogenic temperature.Preferably, filter comprises superconductor.

; the applicant has been noted that: if operator has number of cells some high sensitivity receiver front-ends still less of being segmented than mobile telephone network, then operator must be according to the maximized this mode of network performance is selected a criterion that is used to locate described receiver front end.

Advantageously, the applicant has been found that: according to being used to locate the more criterion of the high sensitivity receiver front-ends of peanut of the number of cells that segmented than network, in the mode that the maximizing performance of network itself is such, be preferably based on traffic carrying capacity desired value from drawing/morphology (cartographic/morphological) information, constituting and to each cell allocation first or second classification of network, so that the number of first category sub-district is approximately equal to the number of high sensitivity receiver front-ends.The applicant is also noted that: by the high sensitivity receiver front-ends that location operator can use in belonging to all sub-districts of first category basically, the traffic carrying capacity that network is concentrated can be maximized.

More particularly, a kind ofly be used for optimizing the method for high sensitivity receiver front-ends 5, comprise the steps: to define the first and second sub-district indicator V in the location of the CDMA type mobile telephone network 1 that comprises a plurality of sub-districts 2 _Cell, V ₂Define first and second threshold value L and the L ₂The described first sub-district indicator V _CellL compares with first threshold, and the described second sub-district indicator V ₂With the second threshold value L ₂Compare; Relevant with first category a plurality of first sub-district 2a, each of the described first sub-district 2a has the described first sub-district indicator V greater than described first threshold L _CellPerhaps greater than the described second threshold value L ₂The described second sub-district indicator V ₂Basically in all described a plurality of first sub-district 2a, locate a plurality of high sensitivity receiver front-ends 5.

The method according to this invention can also comprise the steps: a plurality of second sub-district 2b relevant with second classification, and each of the described second sub-district 2b has the described first sub-district indicator V less than described first threshold L _CellPerhaps less than the described second threshold value L ₂The described second sub-district indicator V ₂Basically in all described a plurality of second sub-district 2b, locate a plurality of muting sensitivity receiver front ends.

Advantageously, be each sub-district 2 definition first and second sub-district indicator V _Cell, V ₂Step comprise the steps: the drawing/morphological characteristic and the described first sub-district indicator V of traffic carrying capacity desired value of each sub-district 2 of expression _CellRelevant; The traffic carrying capacity desired value of each sub-district 2 of expression and the drawing/morphological characteristic and the described second sub-district indicator V of each 2 residing broad geographic area, sub-district ₂Relevant.

In addition, define first and second threshold value L and the L ₂Step comprise the steps: to select by this way described first and second threshold value L and the L ₂A logarithm value so that described a plurality of first sub-district 2a is substantially equal to described a plurality of high sensitivity receiver front-ends 5 on number, and described a plurality of second sub-district 2b is substantially equal to the difference between described a plurality of sub-district 2 and the described a plurality of first sub-district 2a.

Advantageously, described numerical value is to comprising qualified first and second numerical value, and therefore the ratio between described first numerical value and the described second value equals 1/15 ± 0.005 roughly.

Another aspect of the present invention relates to a kind of CDMA mobile telephone network 1 that comprises a plurality of sub-districts 2.A plurality of sub-districts 2 comprise and 90% of a plurality of high sensitivity receiver front-ends 5 relevant a plurality of first sub-district 2a that each first sub-district 2a has the first sub-district indicator V greater than first threshold L at least _CellOr greater than the second threshold value L ₂The second sub-district indicator V ₂

And mobile telephone network 1 according to the present invention comprises a plurality of second sub-district 2bs relevant with a plurality of muting sensitivity receiver front ends, and each second sub-district 2b has the described first sub-district indicator V less than described first threshold L _CellWith less than the described second threshold value L ₂The described second sub-district indicator V ₂

Advantageously, the first sub-district indicator V _CellRelevant with the drawing/morphological characteristic of the traffic carrying capacity desired value of representing each sub-district 2, and the second sub-district indicator V ₂Relevant with the drawing/morphological characteristic of the traffic carrying capacity desired value of representing each sub-district 2 and each 2 residing broad geographic area, sub-district.

In addition, each high sensitivity receiver front-ends 5 is inserted between transceiver antenna 4 and the base station transceiver 3.

In a preferred embodiment, high sensitivity receiver front-ends 5 is low temperature receiver front ends.

In detail, the low temperature receiver front end comprises a cryostat (cryostat) 11, and it has sealed logical mode filter 12 of band and low noise amplifier 13 at least.Preferably, use technology to obtain band pass filter 12 based on the high-tc-super conductor material.

According to another aspect of the present invention, each high sensitivity receiver front-ends 5 is inserted between transceiver antenna 4 and the base station transceiver 3, described high sensitivity receiver front-ends 5 comprises first and second band pass filters 25,26 at least, inserts a low noise amplifier 27 between them.

High sensitivity receiver front-ends 5 can be installed so that the overall noise index of receiver link is minimized along antenna lead-in antenna lead by this way.

More preferably, high sensitivity receiver front-ends 5 is mounted with such distance, that is, such distance makes because the loss that antenna lead-in antenna lead causes can be ignored with respect to the noise figure that high sensitivity receiver front-ends 5 is introduced.

Preferably, described cryostat 11 is operated under the cryogenic temperature that is lower than 200K (more preferably being lower than 100K).

And preferably, cryostat 10 is operated being higher than under the cryogenic temperature of 60K.

Specifically, the number of a plurality of sub-districts 2 of formation mobile telephone network 1 is greater than a predetermined value.

Preferably, described predetermined value is greater than 100, and more preferably, it is greater than 500, even more preferably, it is greater than 1000.

Characteristic of the present invention and advantage will become more apparent from the description of the following statement of the embodiment that only provides by non-restrictive example with reference to the accompanying drawings, in the accompanying drawing:

● Fig. 1 is the schematically illustrating of best server part of a W-CDMA mobile telephone network;

● Fig. 2 is the schematically illustrating of preferred embodiment of the high sensitivity receiver front-ends used in the network of Fig. 1; With

● Fig. 3 is the schematically illustrating of another one embodiment of the high sensitivity receiver front-ends used in the network of Fig. 1;

● Fig. 4 shows with the method according to this invention and implements relevant flow chart.

With reference to figure 1, be used for optimizing the method for high sensitivity receiver front-ends and be applied to the CDMA type and insert the mobile telephone network 1 of (specifically, W-CDMA or CDMA 2000 or UMTS type insert) or its part according to of the present invention in the location of mobile telephone network.For the sake of brevity, Fig. 1 does not illustrate so-called soft handover area, because they are inessential for purpose of the present invention.Specifically, the term soft handover area is meant that portable terminal keeps the active zone that is connected simultaneously with an above sub-district.

In more detail, mobile telephone network 1 comprises a plurality of sub-districts 2 (for example surpass 100, preferably, surpass 500, even more preferably, above 1000).Be present in each sub-district 2 network traffic by be used for to/handle from the base station transceiver 3 (or B-node) of the portable terminal such as cell phone, PDA, computer etc. emission and/or receive radio signals (voice and/or data).Base station transceiver 3 comprises a plurality of transceiver antenna 4 that the number of the sub-district 2 that will serve with described base station equates.

In mobile telephone network 1, for the maximizing performance with network, it is favourable less than a plurality of high sensitivity receiver front-ends of a plurality of sub-districts 2 that number can be located by operator.

As shown in Figure 2, high sensitivity receiver front-ends 5 is inserted between transceiver antenna 4 and the base station transceiver 3 usually.More particularly, if the overall noise index of 3 receiver link is less than 2dB (more preferably less than 1dB, even more preferably less than 0.7dB) from transceiver antenna 4 to base station transceiver, then receiver front end is defined as having high sensitivity.In a preferred embodiment, high sensitivity receiver front-ends 5 is included in one or more equipment of operation under the cryogenic temperature.In this case, high sensitivity receiver front-ends 5 will be represented as the low temperature receiver front end.In detail, high sensitivity receiver front-ends 5 comprises first node 6 that is coupled to transceiver antenna 4 and the Section Point 7 that is coupled to base station transceiver 3.In detail, in first node 6, be divided into two different signals from the signal of transceiver antenna 4: transmit and received signal.In Section Point 7, be present in and transmit and receive two that two links do not hold and transmit and receive signal by combination again.The signal that produces is sent to base station transceiver 3 then.Between first and second nodes 6,7, insert wherein an emission branch 8 and a reception branch 9 that wherein passes through received signal by transmitting.Emission branch 8 comprises emission filter 10, comprises cryostat 11 and receive branch 9, and cryostat 11 is sealed with interconnective band pass filter 12 of cascade arrangement form and low noise amplifier (LNA) 13.Preferably, cryostat 11 comprises another one band pass filter 14.Alternately, band pass filter 14 can be positioned in outside the cryostat 11.Preferably, use based on the technical construction band pass filter 12 of high-tc-super conductor body (HTS) and other band pass filter 14.And cryostat 11 is operated under the cryogenic temperature of (more preferably, between 60K and the 100K) between 60K and the 200K in scope.

High sensitivity receiver front-ends 5 is being mounted at a distance of such distance with transceiver antenna 4: promptly, such distance makes because the loss that antenna lead-in antenna lead causes can be ignored with respect to the noise figure that receiver front end itself is introduced.Preferably, described distance is not more than 1m.Slightly not preferably, high sensitivity receiver front-ends 5 can not be positioned over position along the easiest access of antenna lead-in antenna lead by this way so that under any circumstance all reduce the overall noise index of receiver link.

In more detail, a low temperature receiver front end and its manufacture process have been described in US patent application 2002053215.

Advantageously, the low temperature receiver front end has a noise figure that has reduced (2dB just, 1dB just more preferably, even 0.7dB just more preferably).As a comparison, the noise figure of traditional base station transceiver surpasses 2.5dB usually.

With respect to the sensitivity of traditional base station transceiver, all this point convert the increase of sensitivity from 1dB to 10dB of base station transceiver 3 to.

Slightly not in the preferred embodiment, as shown in Figure 3, high sensitivity receiver front-ends 5 (being meant noise figure less than 2dB (more preferably less than 1.5dB) in this case at this term ＂ high sensitivity ＂) is avoided because the loss that antenna lead-in antenna lead (amplifier or TMA that tower is installed) causes being mounted for from short distance of transceiver antenna.High sensitivity receiver front-ends 5 comprises first node 20 that is coupled to transceiver antenna 4 and the Section Point 21 that is coupled to base station transceiver 3.In first node 20, be divided into two different signals from the signal of transceiver antenna 4: transmit and received signal.Section Point 21 transmits and receives the signal that transmits and receives that two links do not hold in conjunction with being present in again.The signal that produces is sent to base station transceiver 3 then.Insert an emission branch 22 and a reception branch 23 between first and second nodes 20,21.Emission branch 22 comprises emission filter 24, comprises the first and second traditional band pass filters 25,26 and receive branch 23, and inserting one between first and second band pass filters 25,26 is not the low noise amplifier of operating under cryogenic temperature 27.

Referring now to flow chart description the method according to this invention as shown in Figure 4.In detail, the flow chart of Fig. 4 is shown in the sorting algorithm CLASS that each sub-district 2 one-levels are classified.Each sub-district 2 is defined as picture dot collection (regional unit (elements of territory), usually the size that has about 50m x 50m), the service of a kind of particular type that provides for mobile telephone network 1, their form the best server zone of the transceiver antenna 4 of serving that sub-district.Specifically, term ＂ best server zone ＂ is meant such picture dot position: therein, transceiver antenna 4 is guaranteed such field level: this level is to send the service necessary (electromagnetism requirement) of the sort of particular type and the field level that it provides greater than any other edge transceiver antenna.

Be important to note that: this sorting algorithm CLASS uses a picture dot weighted factor ρ _p, it can adopt the numerical value (as an example, between 1 and 100) of a limited quantity based on drawing/morphologic information.For each picture dot, have: ρ _p=MAX (ρ _d, ρ _mρ _s)

Wherein:

ρ _dBe a factor of having considered the built-in percentage (percentage that promptly highly surpasses the picture dot surface that structure covered of 3m) of picture dot, and it can adopt the numerical value that is included among the scope 1-100 as an example;

ρ _mBe one and considered the morphologic factor of picture dot, and it can adopt the numerical value shown in the table 1 given below as an example:

Table 1

Environmental form	Factor ρ mValue
		The urban district	20
The suburb	15
		The industrial area	10
Arboreous zone	1
		The zone of trees rareness and the meadow that tree is arranged	2
Outdoor zone and moist zone that vegetation is arranged	2
		The zone of baldness	1
The glacial epoch	1
		Water	2

Importantly be defined in herein and be considered to the urban district when building, road and the artificial surface (building that highly is less than or equal to 3m, stop, garden, street etc.) that covers take the 80% o'clock environment that surpasses the total surface of being considered.On the other hand, when building, road and the artificial surface that covers (low building, stop etc.) take total surface 50% and 80% between the time environment be considered to the suburb.

In addition, ρ _sBe a factor having considered that the communications infrastructure such as railway, highway and arterial highway exists, and it can adopt the numerical value shown in the table 2 given below as an example:

Table 2

The beginning data item	ρ sValue
		Highway highway+highway+arterial highway, arterial highway+railway	60
Arterial highway arterial highway+railway	30
		Railway	20

For each sub-district 2, the applicant has defined following size:

N _pThe picture dot number (zone of single subdistrict 2) of=composition single subdistrict 2;

ρ _Pi=picture dot weighted factor ρ _pThe numerical value that adopts;

N _p(ρ _Pi)=picture dot weighted factor ρ _pAdopt numerical value ρ _PiThe number of that picture dot.

From above-mentioned size, the applicant has defined the first and second sub-district indicator V of being represented by following expression subsequently respectively _CellAnd V ₂:

$V_{\mathrm{cell}}=\frac{1}{N_p}{\mathrm{\&Sigma;}}_{i=1}^{100}{\mathrm{\&rho;}}_{\mathrm{pi}}{N}_p\left({\mathrm{\&rho;}}_{\mathrm{pi}}\right)$

${\mathrm{<figure-callout\; id="2"\; label="V"\; filenames="C02830019E00201.png"\; state="\{\{state\}\}">V</figure-callout>}}_2=\frac{1}{N_p}{\mathrm{\&Sigma;}}_{i=3}^{100}{\mathrm{\&rho;}}_{\mathrm{pi}}{N}_p\left({\mathrm{\&rho;}}_{\mathrm{pi}}\right)$

Wherein, the first sub-district indicator V _CellBe provided as according to factor ρ _pAnd the standardized estimation of value region of the sub-district of considering 2, and it can for example adopt the interior numerical value of 1-100 scope, and the second sub-district indicator V ₂Definitely (that is, with the size in zone fully independently) only considers to surpass 2 factor ρ _pNumerical value.The applicant has been noted that and is less than or equal to 2 factor ρ _pNumerical value the picture dot with low interest is provided according to the traffic carrying capacity that may provide.If there is not standardization, this second sub-district indicator V then ₂The number range that adopts can't be by definition inferentially (except being 3 the minimum value).

The applicant is also noted that: the first sub-district indicator V _CellHigh value (particularly more than or equal to 20) relevant with the sub-district 2 of high existence with unit of distinguishing the urban district, perhaps with therefore similar morphological characteristic (highway (and with processed traffic carrying capacity aspect) aspect the traffic carrying capacity that may provide is provided, arterial highway, railway) sub-district 2 is relevant., the standardization in zone is helped to reduce the sub-district indicator V relevant with sub-district 2 _CellNumerical value, sub-district 2 also has a quite broad zone in typical outdoor zone basically in some picture dots that comprise common city zone properties.

Therefore the applicant has introduced the second sub-district designator, and its numerical value is assigned to sub-district 2, and sub-district 2 is zone extension out of doors mainly, and comprises the zone with small town or road or railway division.

The applicant is also noted that this two sub-district indicator V _CellAnd V ₂Be used in combination the proper classification of having guaranteed sub-district 2.

Again with reference to the flow chart of figure 4, the sorting algorithm CLASS that is assigned to sub-district 2 is first and second classifications preferably.

Specifically, first category comprises the first sub-district indicator V that has greater than first threshold L _CellOr greater than the second threshold value L ₂The second sub-district indicator V ₂A plurality of first sub-district 2a, and second classification comprises the first sub-district indicator V that has less than first threshold L _CellWith less than the second threshold value L ₂The second sub-district indicator V ₂A plurality of second sub-district 2b.

The applicant has been noted that first and second threshold value L and the L ₂It is right preferably can be selected from any numerical value that satisfies following condition:

Optimal values will be to will being such one: for it, a plurality of first sub-district 2a basically (this term ＂ basically ＂ be meant about 10%) equal a plurality of high sensitivity receiver front-ends 5 that operator can use.Therefore, a plurality of second sub-district 2b will be basically (this term ＂ basically ＂ be meant about 10%) equal to constitute a plurality of sub-districts 2 of mobile telephone network 1 and the difference between a plurality of first sub-district 2a.

The method according to this invention, operator can with a plurality of high sensitivity receiver front-ends 5 at least 90% relevant with a plurality of first sub-district 2a that belong to first category, and a plurality of second sub-district 2b of second classification have the muting sensitivity receiver front end, are meant the overall noise index that surpasses 2.5dB at this term ＂ muting sensitivity ＂.

Below, according to the performance of the traffic carrying capacity that supplies (as a function of best server area extension) the analysis mobile telephone network 1 that uses the method according to this invention to recover.

Analyze in order to carry out this, the applicant has imagined a mobile telephone network 1 that can cover Italy's area part.Contemplated network comprises 2171 sub-districts 2.In addition, the applicant suppose operator can with the number of high sensitivity receiver front-ends 5 equal 1208.

About the geographic area of investigating, two different pieces of this area are identified: first is meant at a greenbelt area portion, and second is meant the area portion that does not comprise any city.

Electromagnetic parameter in the use (frequency, power, antenna) is those parameters in the UMTS standard.

The applicant is threshold value L and L then ₂Select numerical value to (10,150).Use this numerical value to (10,150), realize the segmentation of 2171 sub-districts 2: distribute 1208 first sub-district 2a (therefore, this number equals the number of the high sensitivity receiver front-ends 5 that operator can use) to first category, and distribute 963 second sub-district 2b to second classification.

The method according to this invention, 1208 first sub-district 2a have high sensitivity receiver front-ends 5 (in this case then, term ＂ high sensitivity ＂ is meant the noise figure of 0.7dB), 963 second sub-district 2b have muting sensitivity receiver front end (in this case, ＂ muting sensitivity ＂ is meant the noise figure of 2.7dB) simultaneously.The result who obtains according to providing traffic carrying capacity is as shown in the row in the table 3 given below 1.

Table 3

The traffic carrying capacity that supplies (Erl)

Electromagnetic field level dB μ V/m	High sensitivity receiver front-ends 5 in belonging to 1208 sub-districts 2 of first category	High sensitivity receiver front-ends 5 in place, 405 urban districts (1188 sub-districts)	High sensitivity receiving front-end 5 in place, 405 suburbs (983 sub-districts)
				41	29980	29857	29973
49	27668	27465	27562
				57	23107	22867	22427
61	19502	19270	18544
				67	13499	13367	12579

Should be noted that: the traffic carrying capacity that supplies be that unit is measured with erlang (Erlang).In detail, erlang is to do equal every day of traffic intensity, it according to supply traffic carrying capacity corresponding to effectively average possibility number of connection simultaneously.

In addition, supplied traffic carrying capacity by the best server zone calculating that is called as five kinds of dissimilar services (corresponding to five different electromagnetic field levels) that provides below:

● 41dB μ V/m, speech 13kb/s has earphone;

● 49dB μ V/m, speech 13kb/s does not have earphone; / in the car of earphone is arranged;

● 57dB μ V/m, data 144kb/s is in car;

● 61dB μ V/m, data 64kb/s, indoor;

● 67dB μ V/m, data 384kb/s, indoor.

Row 2 in the table 3 and 3 expressions are by being applied to the result that mobile telephone network 1 obtains to the sorting algorithm of operating in place level (place is defined as the picture dot position of single base station transceiver 3 service) (rather than as under sorting algorithm CLASS situation in each sub-district 2 one-levels).Specifically, the place is classified as place, urban district and place, suburb.

Formerly operate on Ding Yi the same geographic area, the classification of ＂ urban district ＂ is assigned to corresponding to all 405 places that are in 1188 sub-districts 2 in the greenbelt area portion, and the classification of ＂ suburb ＂ is assigned to remaining 405 places, and these remaining 405 places are corresponding to 983 sub-district 2 of the area portion that does not comprise the city.

Result shown in the row 2 of table 3 relates to this situation: wherein all places, 405 urban districts (i.e. all 1188 sub-districts 2) have high sensitivity receiver front-ends 4, and place, 405 suburbs (i.e. all 983 sub-districts 2) have the muting sensitivity receiver front end.

And the result shown in the row 3 of table 3 relates to this situation: wherein all places, 405 suburbs have high sensitivity receiver front-ends 4, and place, 405 urban districts has the muting sensitivity receiver front end.

As each row institute of comparison sheet 3 can be observed like that, a level of consideration is depended in the increase in the professional quantifier of supplying of using that the method according to this invention obtained.Maximum 240 Erls of increase scope in the row 1 and 2 of comparison sheet 3, every month erlang item from minimum 123 Erl of 41dB μ V/m field level to 57dB μ V/m field level.

On the other hand, the row 1 and 3 of comparison sheet 3, the maximum 958Erl of increase scope in the professional quantifier of supplying that uses that the method according to this invention obtained from the minimum 7Erl of 41dB μ V/m field level to 61dB μ V/m field level.

Usually, it can show: by the method according to this invention being applied to mobile telephone network 1, obtained the increase of the traffic carrying capacity that whole network provides, and therefore obtained the increase of the network capacity of scope from minimum 7Erl to maximum 958Erl.

The applicant determines: even threshold value is to L and L ₂90% of variation ± 10% and/or a plurality of at least first sub-district 2a have high sensitivity receiver front-ends 4, and the increase of the traffic carrying capacity that supplies also is held stable basically.

And importantly the regulation utilized bandwidth is approximately the increase of the band pass filter 12 acquisition professional quantifiers that supply of 60MHz.This means in this outstanding advantage particularly for not relevant with the improved spectral selectivity of base station transceiver as people such as Jedamzik are described the urban district.A kind of improved spectral selectivity the GSM network (as described in the article be used to simulate that) situation under be even more important, wherein importantly reduce because the interference that adjacent channel causes.Under the situation of CDMA type network, and specifically under the situation of UMTS type network, as mobile telephone network according to the present invention, above-mentioned advantage aspect the confession traffic carrying capacity, with respect to from because any advantage that derives the reduction of the interference that causes of adjacent channel, be independently and additional.In the example of described network 1, any adjacent channel is not eliminated by band pass filter 12.

The applicant has also carried out the another one analysis, and wherein: the part of the mobile telephone network 1 of imagination comprises 1188 sub-districts 2.Specifically, the geographic area of investigation is corresponding at greenbelt area portion.The applicant has also supposed some high sensitivity receiver front-ends 5 of 10% or 50% or 80% (that is, equaling 119,594 and 950) of the available sum that equals the sub-district 2 imagined respectively of operator.For each configuration of considering, the applicant identifies a pair of threshold value L and the L shown in the table 4 that provides below then ₂:

Table 4

Threshold value	First configuration (10%-119)	Second configuration (50%-594)	The 3rd configuration (80%-950)
				L	41.8	21.2	10.8
L 2	627	318	162

Specifically, use numerical value to (41.8; 627), obtain the segmentation of 1188 sub-districts 2: distribute 119 first sub-district 2a (so this number equals the number of the high sensitivity receiver front-ends 5 that operator can use in this first kind of configuration) to first category; Use numerical value to (21.2; 318), obtain the segmentation of 1188 sub-districts 2: distribute 594 first sub-district 2a (this number equals the number of the high sensitivity receiver front-ends 4 that operator can use in this second kind of configuration) to first category; Use numerical value to (10.8; 162), obtain the segmentation of 1188 sub-districts 2: distribute 950 first sub-district 2a (this number equals the number of the high sensitivity receiver front-ends 5 that operator can use in this third configuration) to first category.

The method according to this invention, in first kind of configuration, 119 first sub-district 2a that identified have available high sensitivity receiver front-ends 5, and remaining 1069 second sub-district 2b have the muting sensitivity receiver front end; In second kind of configuration, 594 first sub-district 2a that identified have available high sensitivity receiver front-ends 4, and 594 second sub-district 2b have the muting sensitivity receiver front end; In the third configuration, 950 first sub-district 2a that identified have available high sensitivity receiver front-ends 4, and 238 second sub-district 2b have the muting sensitivity receiver front end.

Should stipulate: the noise figure value of high sensitivity receiver front-ends 5 and muting sensitivity receiver front end and previous situation about analyzing are employed, and those are identical.

The result who obtains according to the confession traffic carrying capacity is shown in table 5 given below; By being supplied traffic carrying capacity with the corresponding five kinds of dissimilar service compute of five of previous consideration different electromagnetic field levels.

Have the situation of muting sensitivity receiver front end (row 1) and compare for all 1188 sub-districts 2 for the situation that all 1188 sub-districts 2 have a high sensitivity receiver front-ends (row 5).

Table 5

The traffic carrying capacity that supplies (Erl)

Electromagnetic field level dB μ V/m	1188 sub-districts 2 have the muting sensitivity receiver front end	119 sub-districts 2 have high sensitivity receiver front-ends	594 sub-districts 2 have high sensitivity receiver front-ends	950 sub-districts 2 have high sensitivity receiver front-ends	1188 sub-districts 2 have high sensitivity receiver front-ends
						41	20032	20042	20085	20150	20182
49	18951	18981	19099	19243	19314
						57	15922	16097	16601	16882	16992
61	13287	13530	14191	14520	14637
						67	9096	9317	9948	10284	10415

By row 1 and row 2,3,4 and 5 are compared, it should be noted that: for two electromagnetic field levels of beginning, with respect to the gain that has the traffic carrying capacity that supplies that configuration obtained of high sensitivity receiver front-ends with all sub-districts 2, the institute that obtains with configuration 10%, 50%, 80% is for the increase of the traffic carrying capacity percentage less than the high sensitivity receiver front-ends of use.

Specifically, for level 41dB μ V/m, when the high sensitivity receiver front-ends of installing 10%, gain is 10 Erl, and this is equivalent to 6.6% of all 1188 sub-districts 2 equipment 150 Erl that high sensitivity receiver front-ends obtained.Vice versa for High-Field level (corresponding to high numerical value COS), and this situation necessarily reverses.Specifically, for level 67dB μ V/m, when the high sensitivity receiver front-ends of installing 10%, gain has been 16% of the gain that obtains when the 2 equipment high sensitivity receiver front-ends of all 1188 sub-districts.

And, table 6 show according to the average recovery of the high sensitivity receiver front-ends of each installation supply traffic carrying capacity and the result that obtains.

Table 6

Average recover the traffic carrying capacity that supplies (Erl)

Electromagnetic field level dB μ V/m	1188 sub-districts 2 have the muting sensitivity receiver front end	119 sub-districts 2 have high sensitivity receiver front-ends	594 sub-districts 2 have high sensitivity receiver front-ends	950 sub-districts 2 have high sensitivity receiver front-ends	1188 sub-districts 2 have high sensitivity receiver front-ends
						41	0	0.080	0.089	0.124	0.126
49	0	0.250	0.249	0.307	0.306
						57	0	1.471	1.143	1.010	0.901
61	0	2.047	1.523	1.299	1.137
						67	0	1.857	1.435	1.251	1.111

The data that provide in the table 6 show: for the High-Field level, with respect to the configuration that whole high sensitivity receiver front-ends are installed, for configuration 10,50,80, the average traffic of the recovery of the receiver front end of each installation has increased.

Claims (19)

1. one kind is used for optimizing the method for high sensitivity receiver front-ends (5) in the location of the CDMA type mobile telephone network (1) that comprises a plurality of sub-districts (2), and described method is characterised in that: it comprises the steps:

Define the first and second sub-district designator (V _Cell, V ₂), the described first sub-district designator (V _Cell) relevant with the drawing/morphological characteristic of the traffic carrying capacity desired value of representing each sub-district (2), the described second sub-district designator (V ₂) relevant with the drawing/morphological characteristic of the traffic carrying capacity desired value of representing each sub-district (2) and residing broad geographic area, each sub-district (2);

Define first and second threshold values (L, L ₂);

The described first sub-district designator (V _Cell) compare with first threshold (L), and the described second sub-district designator (V ₂) and the second threshold value (L ₂) compare;

Relevant with first category a plurality of first sub-districts (2a), each of described first sub-district (2a) all has the described first sub-district designator (V greater than described first threshold (L) _Cell) or greater than the described second threshold value (L ₂) the described second sub-district designator (V ₂); With

Basically in all described a plurality of first sub-districts (2a), locate a plurality of high sensitivity receiver front-ends (5).

2. the method for claim 1, it is characterized in that: it also comprises the steps:

Relevant with second classification a plurality of second sub-districts (2b), each of described second sub-district (2b) all has the described first sub-district designator (V less than described first threshold (L) _Cell) and less than the described second threshold value (L ₂) the described second sub-district designator (V ₂); With

Basically in all described a plurality of second sub-districts (2b), locate a plurality of muting sensitivity receiver front ends.

3. method as claimed in claim 2 is characterized in that: the described definition first threshold (L) and the second threshold value (L ₂) step comprise the steps: to select by this way the described first threshold (L) and the second threshold value (L ₂) a logarithm value, so that the number of described a plurality of first sub-districts (2a) is substantially equal to the number of described a plurality of high sensitivity receiver front-ends (5), and described a plurality of second sub-districts (2b) are substantially equal to the difference between described a plurality of sub-district (2) and described a plurality of first sub-districts (2a).

4. method as claimed in claim 3 is characterized in that: a described logarithm value comprises first and second numerical value, and described first and second numerical value satisfy the condition that the ratio between described first numerical value and the described second value equals 1/15 ± 0.005.

5. mobile telephone network (1) that comprises the CDMA type of a plurality of sub-districts (2), it is characterized in that: described a plurality of sub-districts (2) comprise with a plurality of high sensitivity receiver front-ends (5) at least 90% relevant a plurality of first sub-districts (2a), each first sub-district (2a) has the first sub-district designator (V greater than first threshold (L) _Cell) or greater than the second threshold value (L ₂) the second sub-district designator (V ₂), the described first sub-district designator (V _Cell) relevant with the drawing/morphological characteristic of the traffic carrying capacity desired value of representing each sub-district (2), the described second sub-district designator (V ₂) relevant with the drawing/morphological characteristic of the traffic carrying capacity desired value of representing each sub-district (2) and residing broad geographic area, each sub-district (2).

6. mobile telephone network as claimed in claim 5, it is characterized in that: it comprises a plurality of second sub-districts (2b) relevant with a plurality of muting sensitivity receiver front ends, and each second sub-district (2b) has the described first sub-district designator (V less than described first threshold (L) _Cell) and less than the described second threshold value (L ₂) the described second sub-district designator (V ₂).

7. mobile telephone network as claimed in claim 5, it is characterized in that: each high sensitivity receiver front-ends (5) is inserted between transceiver antenna (4) and the base station transceiver (3), and described high sensitivity receiver front-ends (5) is a low temperature receiver front end.

8. mobile telephone network as claimed in claim 7, it is characterized in that: described high sensitivity receiver front-ends (5) comprises a cryostat (11), and cryostat (11) is sealed with interconnective band pass filter of cascade arrangement form (12) and low noise amplifier (13).

9. mobile telephone network as claimed in claim 8 is characterized in that: use the technology based on the high-tc-super conductor material to obtain described band pass filter (12).

10. mobile telephone network as claimed in claim 9, it is characterized in that: described high sensitivity receiver front-ends (5) is installed in from the such distance of described transceiver antenna (4), and described distance makes because the loss that antenna lead-in antenna lead causes can be ignored with respect to the noise figure of being introduced by described high sensitivity receiver front-ends (5).

11. mobile telephone network as claimed in claim 10, it is characterized in that: described high sensitivity receiver front-ends (5) is mounted along antenna lead-in antenna lead by this way, so that the overall noise index of the receiver link from described transceiver antenna (4) to described base station transceiver (3) is minimized.

12. mobile telephone network as claimed in claim 8 is characterized in that: described cryostat (11) is operated being lower than under the cryogenic temperature of 200K.

13. mobile telephone network as claimed in claim 8 is characterized in that: described cryostat (11) is operated being lower than under the cryogenic temperature of 100K.

14. mobile telephone network as claimed in claim 8 is characterized in that: described cryostat (11) is operated being higher than under the cryogenic temperature of 60K.

15. as claim 5 or 6 described mobile telephone networks, it is characterized in that: each high sensitivity receiver front-ends (5) is inserted between transceiver antenna (4) and the base station transceiver (3), described high sensitivity receiver front-ends (5) comprises first and second band pass filters (25,26) at least, inserts a low noise amplifier (27) between first and second band pass filters (25,26).

16. mobile telephone network as claimed in claim 5 is characterized in that: the number of described a plurality of sub-districts (2) is greater than a predetermined value.

17. mobile telephone network as claimed in claim 16 is characterized in that: described predetermined value is greater than 100.

18. mobile telephone network as claimed in claim 16 is characterized in that: described predetermined value is greater than 1000.

19. mobile telephone network as claimed in claim 16 is characterized in that: described predetermined value is greater than 500.

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