CN103347261A - Networking method and device for determining deployment of LTE network based on CDMA network data - Google Patents

Abstract

The invention relates to the relevant technical field of a wireless network, in particular to a networking method and device for determining deployment of an LTE network based on CDMA network data. The networking method includes the steps that service amount of each CDMA network cell is acquired according to telephone traffic data of each CDMA network cell; interference matrices among a plurality of CDMA network cells to be selected are acquired according to pilot frequency intensity measurement report messages acquired from a CDMA terminal; under the conditions that constraint conditions are achieved and at least three deployment targets are achieved, at least one CDMA network cell is selected from the CDMA network cells to be selected to deploy the LTE network. The networking method and device for determining deployment of the LTE network based on CDMA network data can deploy the LTE network according to distribution of service requirements, effectively estimate the signal covering condition after the LTE network is deployed according to CDMA network pilot frequency signal measurement information, and can excellently meet the requirement for quickly deploying the network based on the determining deployment of the LTE network.

Description

Determine network-building method and the device of LTE network design based on the cdma network data

Technical field

The present invention relates to the wireless network correlative technology field, particularly relate to network-building method and the device of determining the LTE network design based on the cdma network data.

Background technology

Existing wireless network networking technology generally has two kinds, is based on the network organizing technology of drive test and the wireless network planning technology of emulation Network Based respectively.

Network organizing technology based on drive test at first obtains station spacing according to link budget, and selected candidate point carries out pre-planning in the target area.Place interim transmitting station at candidate point then, carry out the road surface test then, note the test data on the test route.By analyzing drive test data, the assessment candidate point is to the coverage effect of target area, and corresponding adjustment programme.

The wireless network planning technology of emulation Network Based, by the Asset of wireless network planning simulation software such as Aircom company, the Atoll of Forsk company etc., to carrying out emulation in the target area, assessment network planning scheme effect proposes to revise accordingly.Network simulation need provide worker's ginseng, traffic map of 3D emulation map, wireless propagation model parameter, candidate's website of target area etc., different simulated conditions is set, draw every covering performance index, as the reception signal strength of up-downgoing, Signal to Interference plus Noise Ratio, throughput etc.Emulated data is analyzed comparison, and whether assessment network planning scheme can meet the demands, and adjusts programme according to analysis result.

Yet there is certain problem in prior art:

There is limitation in network organizing technology based on drive test.The actual user is randomly dispersed in the overlay area and since building stop that the coverage effect of user position and road surface coverage effect differ greatly.Drive test data can only reflect the signal coverage varies on the test route, and drive test can't reflect the actual signal coverage condition of user position well, is unfavorable for assessing the coverage effect of wireless network.

Also do not build website for the network planning stage, can only adopt a spot of anolog base station to test, can't test simultaneously all candidate sites, therefore can't effectively assess for example LTE networking after, the coverage effect of extensive area.In addition, consider from the cost angle that obtaining of drive test data needs to drop into a large amount of man power and materials, cost is higher, and the spent time is also longer.

The network planning based on drive test data can only be assessed network overlapping effect, can't determine user's distribution, user behavior and business demand.The performance of LTE network, user are experienced with offered load bigger relation, should pay attention to user's spatial distribution in the network planning stage, and telephone traffic distributes, to network coverage Effect on Performance.Need preferential the construction for the high zone of telephone traffic, and build and optimize as the elaboration network.

There is limitation in the networking technology of emulation Network Based.Present most of network simulation software belongs to STATIC SIMULATION, distribution by Monte Carlo experimental simulation user, telephone traffic manually is set distributes, perhaps estimate method analog network load distribution situations such as telephone traffic distribution according to user's permeability and population distribution, thereby carry out the prediction of coverage effect.Because can't obtain user's position exactly, simulation software is difficult to the behavior of analog subscriber exactly, can only be in macroscopic view reflection user's distribution situation.

Simulated effect depends on the accuracy of radio transmission model, and model commonly used has Okumura-Hata model, Cost231Hata model, standard propagation model, ray trace model etc.Simulation software generally uses the standard propagation model, needs to proofread and correct under different cities, the dissimilar scene.(Continuous Wave, CW) data fitting goes out the wireless propagation model parameter of various scenes can to pass through continuous wave test.Similar with drive test, the CW test also needs to expend a large amount of man power and materials, length consuming time.Based on the emulation of the ray trace model propagation condition of analog signal preferably, but the computation complexity height generally can only carry out emulation to zone among a small circle.

Simultaneously, simulated effect also depends on the three-dimensional map precision, and 50 meters precision maps are used in the suburb generally speaking, and 20 meters precision maps are used in common urban district, dense urban even 5 meters precision maps of needs.If adopt the ray trace model also to need to comprise depth of building hum pattern layer.The precision of map is more high, and the figure layer information that comprises is more many, and price is more high.On the other hand, because urban development is rapid, change the phantom error of bringing in order to reduce type of ground objects, improve the simulation result confidence level, map need upgrade in time.When large scale network was disposed, the cost of emulation map can not be ignored.

Summary of the invention

Based on this, be necessary that the calculation of complex cost that exists at the prior art networking mode is higher and can't reflect the technical problem of the coverage condition of actual signal well, provide a kind of and determine network-building method and the device of LTE network design based on the cdma network data, in the target coverage scope, to determine how to dispose new network.

A kind ofly determine to comprise the network-building method of LTE network design based on the cdma network data:

Obtain in a plurality of cdma networks residential quarter to be selected, the traffic data of each cdma network residential quarter and the pilot strength measurement report message of obtaining from terminal, described terminal with cdma network residential quarter to be selected as main Serving cell;

According to the traffic data of each cdma network residential quarter, obtain the traffic carrying capacity of each cdma network residential quarter;

According to pilot strength measurement report message, obtain the interference matrix between a plurality of cdma network residential quarters to be selected;

Satisfy constraints and satisfying at least three and dispose under the target, from a plurality of cdma networks residential quarter to be selected, selecting at least one cdma network residential quarter as being selected network cell, disposing the LTE network at described selected network cell;

Described three deployment targets comprise first target, second target and the 3rd target, and described first target is: the traffic carrying capacity score value total amount maximum that is selected network cell; Described traffic carrying capacity score value total amount according to the traffic carrying capacity of selected network cell calculate, described second target is for being selected the average interference level minimum between the network cell, described average interference level calculates according to described interference matrix; Described the 3rd target is: the minimum number that is selected network cell;

Described constraints is: dispose the area coverage of LTE network more than or equal to default target coverage region area.

Therein among embodiment: described traffic data comprises at least one telephone traffic parameter, described traffic data according to each cdma network residential quarter, and the concrete steps that obtain the traffic carrying capacity of each cdma network residential quarter comprise:

Each telephone traffic parameter is marked according to default thresholding, obtain the telephone traffic score value of each telephone traffic parameter;

Maximum in the selection telephone traffic score value is as traffic carrying capacity.

Among embodiment, the described step that each telephone traffic parameter is marked according to default thresholding specifically comprises therein:

Divide at least one grading system scope according to default thresholding, described grading system scope is the percentage range of described thresholding, and the corresponding score value of each grading system scope;

The score value of described telephone traffic parameter place grading system scope correspondence is the telephone traffic score value of described telephone traffic parameter.

Among embodiment, described telephone traffic parameter comprises forward direction traffic statistic mean value, forward traffic assembly average, forward direction time slot duty ratio assembly average and reverse flow data statistics mean value therein.

Among embodiment, described first target is traffic carrying capacity score value total amount therein

The value maximum, wherein

B wherein _iValue be 0 or 1, work as b _iValue is 0 o'clock, and i cdma network cell deployment LTE network do not selected in expression, works as b _iValue is 1 o'clock, and i cdma network cell deployment LTE network selected in expression,

S wherein _iBe the traffic carrying capacity of i cdma network residential quarter, N is the quantity of cdma network residential quarter to be selected.

Among embodiment, described second target is the average interference level therein The value minimum, wherein

B wherein _iValue be 0 or 1, work as b _iValue is 0 o'clock, and i cdma network cell deployment LTE network do not selected in expression, works as b _iValue is 1 o'clock, and i cdma network cell deployment LTE network selected in expression, and wherein I is described interference matrix,

I wherein _{J, i}/ C _iRepresent the average interference level that bring i cdma network residential quarter j cdma network residential quarter, $\frac{I_{j,i}}{C_i}=\left\{\begin{array}{c}0,j=i\\ \frac{1}{M_i}\underset{k=1}{\overset{K}{\mathrm{\Σ}}}\frac{{\mathrm{EcIo}}_{j,k}\left(k\right)}{{\mathrm{EcIo}}_i\left(k\right)},j\≠i\end{array}\right.,$ EcIo wherein _{J, i}(k) be obtain with in the pilot strength measurement report message of i cdma network residential quarter as the terminal of main Serving cell, j the cdma network residential quarter that comprises in the k bar pilot strength measurement report message is to the pilot frequency intensity of i cdma network area interference, EcIo _i(k) be with in the pilot strength measurement report message of i cdma network residential quarter as the terminal of main Serving cell, the pilot frequency intensity of i the cdma network residential quarter that comprises in the k bar pilot strength measurement report message, M _iExpression is with the message sum of i cdma network residential quarter as the pilot strength measurement report message of the terminal of main Serving cell.

A kind ofly determine to comprise the network device of LTE network design based on the cdma network data:

Parameter acquisition module is used for obtaining a plurality of cdma networks residential quarter to be selected, the traffic data of each cdma network residential quarter and terminal pilot strength measurement report message, described terminal with cdma network residential quarter to be selected as main Serving cell;

The traffic carrying capacity acquisition module is used for the traffic data according to each cdma network residential quarter, obtains the traffic carrying capacity of each cdma network residential quarter;

The interference matrix acquisition module is used for according to pilot strength measurement report message, obtains the interference matrix between a plurality of cdma network residential quarters to be selected;

Select module, be used for satisfying constraints and satisfying at least three and dispose under the target, from a plurality of cdma networks residential quarter to be selected, select at least one cdma network residential quarter as being selected network cell, dispose the LTE network at described selected network cell;

Described three deployment targets comprise first target, second target and the 3rd target, and described first target is: the traffic carrying capacity score value total amount maximum that is selected network cell; Described traffic carrying capacity score value total amount according to the traffic carrying capacity of selected network cell calculate, described second target is for being selected the average interference level minimum between the network cell, described average interference level calculates according to described interference matrix; Described the 3rd target is: the minimum number that is selected network cell;

Described constraints is: dispose the area coverage of LTE network more than or equal to default target coverage region area.

Therein among embodiment: described traffic data comprises at least one telephone traffic parameter, and described traffic carrying capacity acquisition module specifically comprises:

The scoring submodule is used for each telephone traffic parameter is marked according to default thresholding, obtains the telephone traffic score value of each telephone traffic parameter;

Traffic carrying capacity chooser module is used for selecting the maximum of telephone traffic score value as traffic carrying capacity.

Among embodiment, described scoring submodule specifically is used for therein:

Divide at least one grading system scope according to default thresholding, described grading system scope is the percentage range of described thresholding, and the corresponding score value of each grading system scope;

The score value of described telephone traffic parameter place grading system scope correspondence is the telephone traffic score value of described telephone traffic parameter.

Among embodiment, described telephone traffic parameter comprises forward direction traffic statistic mean value, forward traffic assembly average, forward direction time slot duty ratio assembly average and reverse flow data statistics mean value therein.

Among embodiment, described first target is traffic carrying capacity score value total amount therein

The value maximum, wherein

B wherein _iValue be 0 or 1, work as b _iValue is 0 o'clock, and i cdma network cell deployment LTE network do not selected in expression, works as b _iValue is 1 o'clock, and i cdma network cell deployment LTE network selected in expression, S wherein _iBe the traffic carrying capacity of i cdma network residential quarter, N is the quantity of cdma network residential quarter to be selected.

Among embodiment, described second target is the average interference level therein

The value minimum, wherein

B wherein _iValue be 0 or 1, when the bi value is 0, the expression do not select i cdma network cell deployment LTE network, work as b _iValue is 1 o'clock, and i cdma network cell deployment LTE network selected in expression, and wherein I is described interference matrix,

I wherein _{J, i}/ C _iRepresent the average interference level that bring i cdma network residential quarter j cdma network residential quarter, $\frac{I_{j,i}}{C_i}=\left\{\begin{array}{c}0,j=i\\ \frac{1}{M_i}\underset{k=1}{\overset{K}{\mathrm{\Σ}}}\frac{{\mathrm{EcIo}}_{j,k}\left(k\right)}{{\mathrm{EcIo}}_i\left(k\right)},j\≠i\end{array}\right.,$ EcIo wherein _{J, i}(k) be obtain with in the pilot strength measurement report message of i cdma network residential quarter as the terminal of main Serving cell, j the cdma network residential quarter that comprises in the k bar pilot strength measurement report message is to the pilot frequency intensity of i cdma network area interference, EcIo _i(k) be with in the pilot strength measurement report message of i cdma network residential quarter as the terminal of main Serving cell, the pilot frequency intensity of i the cdma network residential quarter that comprises in the k bar pilot strength measurement report message, M _iExpression is with the message sum of i cdma network residential quarter as the pilot strength measurement report message of the terminal of main Serving cell.

Above-mentioned a kind of network-building method and device of determining the LTE network design based on the cdma network data, traffic data by the cdma network residential quarter, the deployment scheme of determining to satisfy constraints and disposing the LTE of target is at selected cdma network cell deployment LTE network.Because CDMA is the network that has moved, therefore the traffic data by using dopes the traffic carrying capacity of LTE network, can accurately reflect the coverage condition of actual signal, based on this deployment of determining the LTE network, be well positioned to meet the demand of quick on-premise network.In calculation process, also need not to adopt three-dimensional map simultaneously, saved cost greatly.

Description of drawings

Fig. 1 is a kind of workflow diagram of determining the network-building method of LTE network design based on the cdma network data of the present invention;

Fig. 2 is a kind of construction module figure that determines the network device of LTE network design based on the cdma network data of the present invention.

Embodiment

The present invention will be further described in detail below in conjunction with the drawings and specific embodiments.

Be illustrated in figure 1 as that the present invention is a kind of to be determined to comprise the workflow diagram of the network-building method of LTE network design based on the cdma network data:

Step S101 obtains in a plurality of cdma networks residential quarter to be selected, the traffic data of each cdma network residential quarter and the pilot strength measurement report message of obtaining from terminal, described terminal with cdma network residential quarter to be selected as main Serving cell;

Step S102 according to the traffic data of each cdma network residential quarter, obtains the traffic carrying capacity of each cdma network residential quarter;

Step S103 according to pilot strength measurement report message, obtains the interference matrix between a plurality of cdma network residential quarters to be selected;

Step 104 is satisfying constraints and is satisfying at least three and dispose under the target, selects at least one cdma network residential quarter as being selected network cell from a plurality of cdma networks residential quarter to be selected, and disposes the LTE network at described selected network cell;

Described three deployment targets comprise first target, second target and the 3rd target, and described first target is: the traffic carrying capacity score value total amount maximum that is selected network cell; Described traffic carrying capacity score value total amount according to the traffic carrying capacity of selected network cell calculate, described second target is for being selected the average interference level minimum between the network cell, described average interference level calculates according to described interference matrix; Described the 3rd target is: the minimum number that is selected network cell;

Described constraints is: dispose the area coverage of LTE network more than or equal to default target coverage region area.

Because the LTE network is to build on the basis of existing C DMA.For dense urban, draw under the LTE station spacing situation close with the existing network station spacing by link budget, can select to carry out the construction of common station with location, CDMA website.

For step S102, develop from the existing LTE network, the certain customers of LTE network are from the original C DMA network user's migration, therefore original cdma network user's spatial distribution, the traffic carrying capacity that business conduct can be predicted the LTE network.

For step S103, LTE has adopted OFDMA(Orthogonal Frequency Division Multiple Access, OFDM) technology, namely there is not the phase mutual interference in the subscriber signal mutually orthogonal in the same cells between the user of same cells.But in order to improve the availability of frequency spectrum, LTE generally adopts identical networking, exists between the adjacent residential quarter and disturbs, and suppressing to disturb is the key that improves LTE network coverage quality.Present embodiment calculates the interference matrix between the neighbor cell by obtain pilot strength measurement report message from cdma network, takes into full account because the Signal to Interference plus Noise Ratio decline problem that covering brings is crossed in the residential quarter.

The method of step S102 computing service amount, those of ordinary skills can carry out concrete replenishing by the limited number of time experiment after reading this patent.Therein among embodiment: described traffic data comprises at least one telephone traffic parameter, and the concrete steps of described step S102 comprise:

Each telephone traffic parameter is marked according to default thresholding, obtain the telephone traffic score value of each telephone traffic parameter;

Maximum in the selection telephone traffic score value is as traffic carrying capacity.

The method of scoring has multiple, and among embodiment, the described step that each telephone traffic parameter is marked according to default thresholding specifically comprises therein:

Divide at least one grading system scope according to default thresholding, described grading system scope is the percentage range of described thresholding, and the corresponding score value of each grading system scope;

The score value of described telephone traffic parameter place grading system scope correspondence is the telephone traffic score value of described telephone traffic parameter.

Among embodiment, described telephone traffic parameter comprises forward direction traffic statistic mean value, forward traffic assembly average, forward direction time slot duty ratio assembly average and reverse flow data statistics mean value therein.

Among embodiment, described first target is traffic carrying capacity score value total amount therein

The value maximum, wherein B wherein _iValue be 0 or 1, work as b _iValue is 0 o'clock, and i cdma network cell deployment LTE network do not selected in expression, works as b _iValue is 1 o'clock, and i cdma network cell deployment LTE network selected in expression, S wherein _iBe the traffic carrying capacity of i cdma network residential quarter, N is the quantity of cdma network residential quarter to be selected.

Among embodiment, described second target is the average interference level therein

The value minimum, wherein

B wherein _iValue be 0 or 1, work as b _iValue is 0 o'clock, and i cdma network cell deployment LTE network do not selected in expression, works as b _iValue is 1 o'clock, and i cdma network cell deployment LTE network selected in expression, and wherein I is described interference matrix,

I wherein _{J, i}/ C _iRepresent the average interference level that bring i cdma network residential quarter j cdma network residential quarter, $\frac{I_{j,i}}{C_i}=\left\{\begin{array}{c}0,j=i\\ \frac{1}{M_i}\underset{k=1}{\overset{K}{\mathrm{\Σ}}}\frac{{\mathrm{EcIo}}_{j,k}\left(k\right)}{{\mathrm{EcIo}}_i\left(k\right)},j\≠i\end{array}\right.,$ EcIo wherein _{J, i}(k) be obtain with in the pilot strength measurement report message of i cdma network residential quarter as the terminal of main Serving cell, j the cdma network residential quarter that comprises in the k bar pilot strength measurement report message is to the pilot frequency intensity of i cdma network area interference, EcIo _i(k) be with in the pilot strength measurement report message of i cdma network residential quarter as the terminal of main Serving cell, the pilot frequency intensity of i the cdma network residential quarter that comprises in the k bar pilot strength measurement report message, M _iExpression is with the message sum of i cdma network residential quarter as the pilot strength measurement report message of the terminal of main Serving cell.

Be illustrated in figure 2 as a kind of construction module figure that determines the network device of LTE network design based on the cdma network data of the present invention, comprise:

A kind ofly determine to comprise the network device of LTE network design based on the cdma network data:

Parameter acquisition module 210, be used for obtaining a plurality of cdma networks residential quarter to be selected, the traffic data of each cdma network residential quarter and the pilot strength measurement report message of obtaining from terminal, described terminal with cdma network residential quarter to be selected as main Serving cell;

Traffic carrying capacity acquisition module 220 is used for the traffic data according to each cdma network residential quarter, obtains the traffic carrying capacity of each cdma network residential quarter;

Interference matrix acquisition module 230 is used for according to pilot strength measurement report message, obtains the interference matrix between a plurality of cdma network residential quarters to be selected;

Select module 240, be used for satisfying constraints and satisfying at least three and dispose under the target, from a plurality of cdma networks residential quarter to be selected, select at least one cdma network residential quarter as being selected network cell, dispose the LTE network at described selected network cell;

Described three deployment targets comprise first target, second target and the 3rd target, and described first target is: the traffic carrying capacity score value total amount maximum that is selected network cell; Described traffic carrying capacity score value total amount according to the traffic carrying capacity of selected network cell calculate, described second target is for being selected the average interference level minimum between the network cell, described average interference level calculates according to described interference matrix; Described the 3rd target is: the minimum number that is selected network cell;

Described constraints is: dispose the area coverage of LTE network more than or equal to default target coverage region area.

Therein among embodiment: described traffic data comprises at least one telephone traffic parameter, and described traffic carrying capacity acquisition module 220 specifically comprises:

Scoring submodule 221 is used for each telephone traffic parameter is marked according to default thresholding, obtains the telephone traffic score value of each telephone traffic parameter;

Traffic carrying capacity chooser module 222 is used for selecting the maximum of telephone traffic score value as traffic carrying capacity.

Among embodiment, described scoring submodule 221 specifically is used for therein:

Divide at least one grading system scope according to default thresholding, described grading system scope is the percentage range of described thresholding, and the corresponding score value of each grading system scope;

The score value of described telephone traffic parameter place grading system scope correspondence is the telephone traffic score value of described telephone traffic parameter.

Among embodiment, described telephone traffic parameter comprises forward direction traffic statistic mean value, forward traffic assembly average, forward direction time slot duty ratio assembly average and reverse flow data statistics mean value therein.

Among embodiment, described first target is traffic carrying capacity score value total amount therein

The value maximum, wherein

B wherein _iValue be 0 or 1, work as b _iValue is 0 o'clock, and i cdma network cell deployment LTE network do not selected in expression, works as b _iValue is 1 o'clock, and i cdma network cell deployment LTE network selected in expression,

S wherein _iBe the traffic carrying capacity of i cdma network residential quarter, N is the quantity of cdma network residential quarter to be selected.

Among embodiment, described second target is the average interference level therein

The value minimum, wherein

B wherein _iValue be 0 or 1, work as b _iValue is 0 o'clock, and i cdma network cell deployment LTE network do not selected in expression, works as b _iValue is 1 o'clock, and i cdma network cell deployment LTE network selected in expression, and wherein I is described interference matrix,

I wherein _{J, i}/ C _iRepresent the average interference level that bring i cdma network residential quarter j cdma network residential quarter, $\frac{I_{j,i}}{C_i}=\left\{\begin{array}{c}0,j=i\\ \frac{1}{M_i}\underset{k=1}{\overset{K}{\mathrm{\Σ}}}\frac{{\mathrm{EcIo}}_{j,k}\left(k\right)}{{\mathrm{EcIo}}_i\left(k\right)},j\≠i\end{array}\right.,$ EcIo wherein _{J, i}(k) be obtain with in the pilot strength measurement report message of i cdma network residential quarter as the terminal of main Serving cell, j the cdma network residential quarter that comprises in the k bar pilot strength measurement report message is to the pilot frequency intensity of i cdma network area interference, EcIo _i(k) be with in the pilot strength measurement report message of i cdma network residential quarter as the terminal of main Serving cell, the pilot frequency intensity of i the cdma network residential quarter that comprises in the k bar pilot strength measurement report message, M _iExpression is with the message sum of i cdma network residential quarter as the pilot strength measurement report message of the terminal of main Serving cell.

As an example, specifically be discussed below:

1, use the data traffic requirement amount of cdma network as the foundation of LTE deployment

By cdma network (CDMA-EVDO network for example, be CDMA20001xEV-DO) traffic data, as forward direction telephone traffic, forward traffic, forward direction time slot duty ratio, and network performance index such as reverse flow assessment LTE traffic needs distribution situation spatially, thereby instruct the LTE networking.

Extract from the webmaster backstage of cdma network the cell-level cdma service in 1 week when busy the traffic statistics data average statistics, comprise forward direction telephone traffic, forward traffic, forward direction time slot duty ratio, reverse flow.Carry out the individual event scoring S that rank scores obtains certain cdma network cell i according to numerical value _{I, A}, S _{I, B}, S _{I, C}And S _{I, D}, then these parameter scores are got maximum, as the traffic needs scoring S of residential quarter c _i, shown in (1):

S _I＝MAX(S _i,A,S _i,B,S _i,C,S _i,D) （1）

2, build the coverage effect that back LTE disposes in the station altogether according to the measurement report assessment of user terminal to send up

CDMA user terminal to send up network measure result collects the user terminal to send up data by the base station, and reporting base station control centre, stores at the back-stage management center.The call record data Call Data Record(CDR of CDMA user terminal to send up) comprises pilot strength measurement report message Pilot Strength Measurement Message(PSMM in).Utilize pilot strength information to assess to utilize location, CDMA website to stand altogether to build the covering performance of network behind the LTE, be used for building the LTE network thereby filter out appropriate C DMA net base station.

When the CDMA user terminal switches, can trigger the PSMM information that reports, wherein comprise the pilot frequency intensity EcIo value that user terminal receives main Serving cell and inferior strong signal cell, use pilot frequency intensity EcIo to estimate the situation of the DO network coverage usually.And LTE is mainly with the carrier-in-interference noise ratio Carrier to Interference plus Noise Ratio(CINR of signal) weigh coverage condition.

Introduce the process that is mapped to the CINR of LTE network by the pilot frequency intensity EcIo of CDMA below.Suppose that at first LTE and CDMA are deployed in similar frequency bands, the coverage condition of LTE network under analysis and the cdma network same network topology structure, and then the situation that high band is disposed the LTE network of moving to is discussed.

(1) assessing with the covering quality of CDMA similar frequency bands deployment LTE network

Behavior time division multiplexing under the cdma network, the pilot signal of identical frequency mainly is subjected to the Pilot Interference of other residential quarters, the signal of LTE network is disturbed by the signal of adjacent area equally, under the network load of LTE network 100%, be all channel resources of neighbor cell all under the occupied situation, can think that adjacent area interference situation is similar to cdma network.

For cdma network, wherein, the EcIo of i CDMA residential quarter _iBe defined as:

${\mathrm{EcIo}}_i=\frac{C_{i,\mathrm{CDMA}}}{C_{i,\mathrm{CDMA}}+I_{i,\mathrm{CDMA}}+N_{\mathrm{CDMA}}}---\left(2\right),$

C wherein _{I, CDMA}Be the received power of the useful signal of i CDMA residential quarter, I _{I, CDMA}Be the power of the interference signal of i CDMA residential quarter, N _CDMAIt is the thermal noise power of i CDMA residential quarter.

PSMM has also reported the intensity that receives other adjacent area pilot tones except the pilot frequency intensity of main Serving cell, remember that the i residential quarter is subjected to the j district pilots and disturbs, and residential quarter j pilot frequency intensity is EcIo _{J, i}:

${\mathrm{EcIo}}_{j,i}=\frac{I_{j,\mathrm{iCDMA}}}{C_{i,\mathrm{CDMA}+}{I}_{i,\mathrm{CDMA}}+N_{\mathrm{CDMA}}}=\frac{I_{j,i,\mathrm{CDMA}}}{C_{i,\mathrm{CDMA}}+\underset{k=1}{\overset{J}{\mathrm{\Σ}}}{I}_{k,\mathrm{iCDMA}}+N_{\mathrm{CDMA}}}---\left(3\right)$

Wherein, I _{J, i, CDMA}Refer to that the user of cell i receives the pilot signal of other residential quarters j; I _{K, I, CDMA}Be the pilot signal power that user i receives other residential quarters k, the pilot signal number of the interference that J can receive for the user.The ratio of the pilot tone of main Serving cell i and adjacent residential quarter j pilot tone is carrier interference ratio C _i/ I _{J, i}:

$\frac{C_i}{I_{j,i}}=\frac{{\mathrm{EcIo}}_i}{{\mathrm{EcIo}}_{j,i}}---\left(4\right)$

The covering performance of LTE wireless network mainly is subjected to the influence of the Signal to Interference plus Noise Ratio CINR of signal, be embodied in CINR and whether reach the demodulation threshold requirement, as reach-more than the 3dB.Specifically relevant with selected modulation system, bit rate.In order to reach favorable user experience, general requirement reaches 0dB even 6dB.

${\mathrm{CINR}}_{\mathrm{LTE}}=\frac{C_{\mathrm{LTE}}}{I_{\mathrm{LTE}}+N_{\mathrm{LTE}}}---\left(5\right)$

C wherein _LTEBe the received power of the useful signal of LTE network, I _LTEBe the power of the interference signal of LTE network, N _LTEThermal noise power for the LTE network.

In dense urban, the cdma network station spacing is less, thinks that signal is stronger, and main influence is disturbed for the adjacent area, ignores The noise, and then the Signal to Interference plus Noise Ratio of i CDMA residential quarter has:

${\mathrm{CINR}}_{i,\mathrm{CDMA}}=\frac{C_{i,\mathrm{CDMA}}}{I_{i,\mathrm{CDMA}}+N_{i,\mathrm{CDMA}}}\≈\frac{C_{i,\mathrm{CDMA}}}{I_{i,\mathrm{CDMA}}}---\left(6\right)$

The whole frequency bandwidth of cdma network in fixing time slot launched pilot signal, and when the LTE network load is 100%, transmits at all subcarriers, so both adjacent area interference situations are similar.When CDMA and LTE dispose in similar frequency bands identical network structure, for same user terminal receiving position, the Signal to Interference plus Noise Ratio C/I of two networks is identical.

$\frac{C}{I}=\frac{C_i}{\underset{n\≠i}{\mathrm{\Σ}}{C}_n}---\left(7\right)$

C wherein _iThe received signal power of representing current i residential quarter, C _nReceived power for other residential quarters.

$C_i=\frac{P_i}{L_i}---\left(8\right)$

P _iBe the transmitting power of cell i signal, L _iBe descending path loss.The transmitting power of the pilot tone of CDMA and LTE sub-carrier signal is fixed value, i.e. the identical P of the transmitting power of each residential quarter _i=P, formula (7) then becomes:

$\frac{C}{I}=\frac{1/L_i}{\underset{n\≠i}{\mathrm{\Σ}}1/L_n}=\frac{1}{\underset{n\≠i}{\mathrm{\Σ}}{L}_i/L_n}---\left(9\right)$

Path loss L is mainly by radio transmission loss L _A, feeder loss L _B, device splicing loss L _C, dual-mode antenna gain L _D, penetration loss L _EDeng composition, under similar frequency bands, identical topological structure, identical worker's ginseng condition, CDMA equates with the C/I of LTE, can think that then the CINR of CDMA and LTE is close.

[L] _dB＝[L _A] _dB+[L _B] _dB+[L _C] _dB+[L _D] _dB+[L _E] _dB-[G] _dB （10）

(2) in the more covering quality assessment of high band deployment LTE network

For identical network topology structure, at different frequency range deploy LTE, the carrier/interface ratio of high band is better than the carrier/interface ratio of low-frequency range, namely

Wherein

Be the carrier/interface ratio of low-frequency range,

Carrier/interface ratio for high band.Be analyzed as follows:

Learn that by formula (9) C/I mainly is subjected to L _i/ L _nInfluence, then have in conjunction with formula (10)

[L _i/L _n] _dB＝[L _i] _dB-[L _n] _dB＝[L _A,i] _dB-[L _A,i] _dB+Δ[G _i,n] _dB （11）

Wherein, L _{A, i}Be the radio transmission loss of i residential quarter, L _{A, n}It is the radio transmission loss of n residential quarter.Here think that the feeder loss of each base station and device Insertion Loss, penetration loss are close, cancel out each other L _i/ L _nMain gain with dual-mode antenna, propagation loss is relevant.The dual-mode antenna gain difference mainly is because directional antenna is adopted in the base station, and the user terminal position causes different districts to there are differences to same user's antenna gain with respect to the direction difference of each antenna in cell.

The principal element that influences the radio transmission loss is that frequency, base station and user distance, antenna for base station are hung height, user position height etc.Have according to the standard propagation model:

[L _A] _dB＝K ₁+K ₂log(d)+K ₃H _meff+K ₄log(H _meff)

+K ₅log(H _eff)+K ₆log(H _eff)log(d)+K ₇Diffn+K _clutters

[L _A] _dB=K ₁+K ₂log(d)+K ₃H _meff+K ₄1og(H _meff)

+K ₅log(H _eff)+K ₆log(H _eff)log(d)+K ₇Diffn+K _clitters（12）

K wherein _i, i=1,2,3,4,5,6,7, Diffn, Kclutters is propagation model parameter, can calibrate by the CW test, and d is the distance that the user is arrived in the base station, H _EffFor antenna for base station is hung height, H _MeffHeight for user terminal.For the standard radio propagation model under the different frequency varying environment, main difference is embodied in K1 and K2 value, and other parameters are comparatively approaching.The antenna for base station of same section is hung high approximate, i.e. H _{Eff, i}=H _{Eff, n}=H _Eff, H wherein _{Eff, i}The antenna for base station that is i residential quarter is hung height, wherein H _{Eff, n}The antenna for base station that is n residential quarter is hung height.Can be got by formula (11) and formula (12)

[L _i/L _n] _dB≈K ₂×log(d _i/d _n)+K ₆×log(H _eff)log(d _i/d _n)+Δ[G _i,n] _dB

（13）

Under identical communication environments, the system works frequency change is to K6 and antenna gain discrepancy delta [G _{I, n}] _DBInfluence is little.Main first of considering in the formula (13).

Wherein, K ₂Increase along with the rising of operating frequency, and be on the occasion of, i.e. 0＜K _{2, low frequency}＜K _{2, high frequency}The user is from the close together of main Serving cell, i.e. d generally speaking _i＜d _n[L is then arranged _i/ L _n] _{DB, low frequency}[L _i/ L _n] _{DB, high frequency}By corresponding the obtaining of formula (9) [C/I] _{Low frequency}＜[C/I] _{High frequency}Therefore, if reach requirement at the C/I of low-frequency range deployment LTE, dispose LTE at high band and also can reach requirement.

Can learn the carrier interference ratio C that can obtain Serving cell and interfered cell signal from the PSMM of cdma network by top analysis _i/ I _{J, i}, can weigh the carrier/interface ratio after colocation site is disposed LTE.In addition, LTE offered load 100% situation is considered in above-mentioned analysis, and real network is loaded 30%～50%, that is to say that the network performance of above-mentioned estimation is too conservative, has certain redundancy.

The modeling of 3, network planning problem

The identification number whether i residential quarter disposes LTE is designated as b _i(i=1,2 ... N), column vector →

Expression is to the screening scheme of N residential quarter, wherein b _iValue be 0 or 1, work as b _iValue is 0 o'clock, and i cdma network cell deployment LTE network do not selected in expression, works as b _iValue is 1 o'clock, and i cdma network cell deployment LTE network selected in expression,

$b_i=\{\begin{array}{c}0,\\ 1\end{array}---\left(14\right)$

By network planning screening CDMA residential quarter, whole net is absorbed must try one's best big the time, the average interference level is few as far as possible, and with coverage goal zone, fewer purpose residential quarter, network planning problem so is modeled as multi-objective optimization question:

Target 1, the traffic carrying capacity maximization of selecting the residential quarter that whole net is absorbed

By traffic needs scoring S _iObtain the traffic carrying capacity vector

By the screening residential quarter, namely select

Make the traffic carrying capacity maximization of overall network, that is:

Target 1: order The value maximum, that is:

$\max \stackrel{{\→}^T}{B}\·\stackrel{\→}{S}---\left(15\right)$

Target 2, selection residential quarter minimize whole net average interference level,

I wherein _{J, i}/ C _iThe average interference level of j cdma network cell deployment LTE network to bringing at i cdma network cell deployment LTE selected in expression,

Definition interference matrix

I _{J, i}/ C _iThe average interference level of when expression selects residential quarter j to dispose LTE cell i being brought, namely

$\frac{I_{j,i}}{C_i}=\{\begin{array}{c}0,j=i\\ \frac{{\mathrm{EcIo}}_{j,i}}{{\mathrm{EcIo}}_i},j\≠i\end{array}---\left(16\right)$

Wherein, the mean value of adjacent residential quarter and main Serving cell EcIo ratio can calculate by the formula below the pilot frequency intensity substitution of the PSMM message of CDMA terminal to report

$\frac{I_{j,i}}{C_i}=\{\begin{array}{c}0,j=i\\ \frac{1}{M_i}\underset{k=1}{\overset{k}{\mathrm{\Σ}}}\frac{{\mathrm{EcIo}}_{j,i}\left(k\right)}{{\mathrm{EcIo}}_i\left(k\right)},j\≠i\end{array}---\left(17\right)$

EcIo _{J, i}(k) and EcIo _i(k) represent that respectively the k bar has comprised the pilot frequency intensity that residential quarter j disturbs main Serving cell i in the PSMM message of main Serving cell i, and the pilot frequency intensity of corresponding main Serving cell i, M _iThe PSMM message sum of representing main Serving cell i.Because the user is randomly dispersed in the residential quarter, measurement result has reflected the distribution situation of interference signal on the space, and formula (17) result of calculation can be used as the average interference level of the cell i of residential quarter j.

By selecting the residential quarter, make the ensemble average minimum interference, namely

Target 2: $\min \frac{\stackrel{{\→}^T}{B}\·I\·\stackrel{\→}{B}}{\stackrel{{\→}^T}{B}\·\stackrel{\→}{B}}---\left(18\right)$

Target 3, the housing estate development LTE that selection is tried one's best few in the target coverage zone are to reduce construction investment

$\min \stackrel{{\→}^T}{B}\·\stackrel{\→}{B}---\left(19\right)$

Constraints: satisfy covering requirement

General overlay area of using hexagon approximate description residential quarter, hexagonal side length is a, the covering radius of residential quarter is R=2a.The overlay area area can be expressed as

$A=\frac{3\sqrt{3}}{2}{a}^2=\frac{3\sqrt{3}}{8}{R}^2---\left(20\right)$

Can obtain the covering radius R of residential quarter according to link budget.For given coverage goal zone, its gross area is that V then requires to satisfy as follows

$\frac{3\sqrt{3}}{8}{R}^2\·\stackrel{{\→}^T}{B}\·\stackrel{\→}{B}\≥V---\left(21\right)$

The engineering problem that then screens CDMA housing estate development LTE can be modeled as multi-objective optimization question, and is as follows:

Target 1: $\max \stackrel{{\→}^T}{B}\·\stackrel{\→}{S};$

Target 2: $\min \frac{\stackrel{{\→}^T}{B}\·I\·\stackrel{\→}{B}}{\stackrel{{\→}^T}{B}\·\stackrel{\→}{B}};$

Target 3: $\min \stackrel{{\→}^T}{B}\·\stackrel{\→}{B}$

Make $\stackrel{{\→}^T}{B}\·\stackrel{\→}{B}\≥\frac{V}{\frac{3\sqrt{3}}{8}{R}^2}$

This optimization problem belongs to integer programming and multi-objective optimization question, can adopt genetic algorithm to obtain.Basic step is as follows:

1) at first forms one group of candidate solution As initialization colony;

2) calculate the target function value of each candidate solution in the colony, and be mapped to fitness;

3) when satisfying index request, candidate solution then stops the output result; Otherwise carry out genetic manipulation, candidate solution comprised that selection, intersection, variation generate new candidate solution, as colony of future generation, continue the 2nd) the step operation.

The above embodiment has only expressed several execution mode of the present invention, and it describes comparatively concrete and detailed, but can not therefore be interpreted as the restriction to claim of the present invention.Should be pointed out that for the person of ordinary skill of the art without departing from the inventive concept of the premise, can also make some distortion and improvement, these all belong to protection scope of the present invention.Therefore, the protection range of patent of the present invention should be as the criterion with claims.

Claims (12)

1. determine to it is characterized in that the network-building method of LTE network design based on the cdma network data for one kind, comprising:

Obtain in a plurality of cdma networks residential quarter to be selected, the traffic data of each cdma network residential quarter and the pilot strength measurement report message of obtaining from terminal, described terminal with cdma network residential quarter to be selected as main Serving cell;

According to the traffic data of each cdma network residential quarter, obtain the traffic carrying capacity of each cdma network residential quarter;

According to pilot strength measurement report message, obtain the interference matrix between a plurality of cdma network residential quarters to be selected;

Satisfy constraints and satisfying at least three and dispose under the target, from a plurality of cdma networks residential quarter to be selected, selecting at least one cdma network residential quarter as being selected network cell, disposing the LTE network at described selected network cell;

Described three deployment targets comprise first target, second target and the 3rd target, and described first target is: the traffic carrying capacity score value total amount maximum that is selected network cell; Described traffic carrying capacity score value total amount according to the traffic carrying capacity of selected network cell calculate, described second target is for being selected the average interference level minimum between the network cell, described average interference level calculates according to described interference matrix; Described the 3rd target is: the minimum number that is selected network cell;

Described constraints is: dispose the area coverage of LTE network more than or equal to default target coverage region area.

2. the network-building method of determining the LTE network design based on the cdma network data according to claim 1, it is characterized in that: described traffic data comprises at least one telephone traffic parameter, described traffic data according to each cdma network residential quarter, the concrete steps that obtain the traffic carrying capacity of each cdma network residential quarter comprise:

Each telephone traffic parameter is marked according to default thresholding, obtain the telephone traffic score value of each telephone traffic parameter;

Maximum in the selection telephone traffic score value is as traffic carrying capacity.

3. according to claim 2ly determine to it is characterized in that the network-building method of LTE network design based on the cdma network data, the described step that each telephone traffic parameter is marked according to default thresholding,

Specifically comprise:

Divide at least one grading system scope according to default thresholding, described grading system scope is the percentage range of described thresholding, and the corresponding score value of each grading system scope;

The score value of described telephone traffic parameter place grading system scope correspondence is the telephone traffic score value of described telephone traffic parameter.

4. the network-building method of determining the LTE network design based on the cdma network data according to claim 2, it is characterized in that described telephone traffic parameter comprises forward direction traffic statistic mean value, forward traffic assembly average, forward direction time slot duty ratio assembly average and reverse flow data statistics mean value.

5. according to claim 2ly determine the network-building method of LTE network design to it is characterized in that described first target is traffic carrying capacity score value total amount based on the cdma network data The value maximum, wherein

B wherein _iValue be 0 or 1, work as b _iValue is 0 o'clock, and i cdma network cell deployment LTE network do not selected in expression, works as b _iValue is 1 o'clock, and i cdma network cell deployment LTE network selected in expression,

S wherein _iBe the traffic carrying capacity of i cdma network residential quarter, N is the quantity of cdma network residential quarter to be selected.

6. according to claim 1ly determine the network-building method of LTE network design to it is characterized in that described second target is the average interference level based on the cdma network data

The value minimum, wherein

B wherein _iValue be 0 or 1, work as b _iValue is 0 o'clock, and i cdma network cell deployment LTE network do not selected in expression, works as b _iValue is 1 o'clock, and i cdma network cell deployment LTE network selected in expression, and wherein I is described interference matrix,

I wherein _{J, i}/ C _iRepresent the average interference level that bring i cdma network residential quarter j cdma network residential quarter, $\frac{I_{j,i}}{C_i}=\left\{\begin{array}{c}0,j=i\\ \frac{1}{M_i}\underset{k=1}{\overset{K}{\mathrm{\Σ}}}\frac{{\mathrm{EcIo}}_{j,k}\left(k\right)}{{\mathrm{EcIo}}_i\left(k\right)},j\≠i\end{array}\right.,$ EcIo wherein _{J, i}(k) be obtain with in the pilot strength measurement report message of i cdma network residential quarter as the terminal of main Serving cell, j the cdma network residential quarter that comprises in the k bar pilot strength measurement report message is to the pilot frequency intensity of i cdma network area interference, EcIo _i(k) be with in the pilot strength measurement report message of i cdma network residential quarter as the terminal of main Serving cell, the pilot frequency intensity of i the cdma network residential quarter that comprises in the k bar pilot strength measurement report message, M _iExpression is with the message sum of i cdma network residential quarter as the pilot strength measurement report message of the terminal of main Serving cell.

7. determine to it is characterized in that the network device of LTE network design based on the cdma network data for one kind, comprising:

Parameter acquisition module is used for obtaining a plurality of cdma networks residential quarter to be selected, the traffic data of each cdma network residential quarter and the pilot strength measurement report message of obtaining from terminal, described terminal with cdma network residential quarter to be selected as main Serving cell;

The traffic carrying capacity acquisition module is used for the traffic data according to each cdma network residential quarter, obtains the traffic carrying capacity of each cdma network residential quarter;

The interference matrix acquisition module is used for according to pilot strength measurement report message, obtains the interference matrix between a plurality of cdma network residential quarters to be selected;

Select module, be used for satisfying constraints and satisfying at least three and dispose under the target, from a plurality of cdma networks residential quarter to be selected, select at least one cdma network residential quarter as being selected network cell, dispose the LTE network at described selected network cell;

Described three deployment targets comprise first target, second target and the 3rd target, and described first target is: the traffic carrying capacity score value total amount maximum that is selected network cell; Described traffic carrying capacity score value total amount according to the traffic carrying capacity of selected network cell calculate, described second target is for being selected the average interference level minimum between the network cell, described average interference level calculates according to described interference matrix; Described the 3rd target is: the minimum number that is selected network cell;

Described constraints is: dispose the area coverage of LTE network more than or equal to default target coverage region area.

8. according to claim 7ly determine the network device of LTE network design based on the cdma network data, it is characterized in that: described traffic data comprises at least one telephone traffic parameter, and described traffic carrying capacity acquisition module specifically comprises:

The scoring submodule is used for each telephone traffic parameter is marked according to default thresholding, obtains the telephone traffic score value of each telephone traffic parameter;

Traffic carrying capacity chooser module is used for selecting the maximum of telephone traffic score value as traffic carrying capacity.

9. according to claim 8ly determine the network device of LTE network design to it is characterized in that described scoring submodule specifically is used for based on the cdma network data:

Divide at least one grading system scope according to default thresholding, described grading system scope is the percentage range of described thresholding, and the corresponding score value of each grading system scope;

The score value of described telephone traffic parameter place grading system scope correspondence is the telephone traffic score value of described telephone traffic parameter.

10. the network device of determining the LTE network design based on the cdma network data according to claim 8, it is characterized in that described telephone traffic parameter comprises forward direction traffic statistic mean value, forward traffic assembly average, forward direction time slot duty ratio assembly average and reverse flow data statistics mean value.

11. according to claim 8ly determine the network device of LTE network design to it is characterized in that described first target is traffic carrying capacity score value total amount based on the cdma network data

The value maximum, wherein B wherein _iValue be 0 or 1, work as b _iValue is 0 o'clock, and i cdma network cell deployment LTE network do not selected in expression, works as b _iValue is 1 o'clock, and i cdma network cell deployment LTE network selected in expression,

S wherein _iBe the traffic carrying capacity of i cdma network residential quarter, N is the quantity of cdma network residential quarter to be selected.

12. according to claim 7ly determine the network device of LTE network design to it is characterized in that described second target is the average interference level based on the cdma network data

The value minimum, wherein

B wherein _iValue be 0 or 1, work as b _iValue is 0 o'clock, and i cdma network cell deployment LTE network do not selected in expression, works as b _iValue is 1 o'clock, and i cdma network cell deployment LTE network selected in expression, and wherein I is described interference matrix,

I wherein _{J, i}/ C _iRepresent the average interference level that bring i cdma network residential quarter j cdma network residential quarter, $\frac{I_{j,i}}{C_i}=\left\{\begin{array}{c}0,j=i\\ \frac{1}{M_i}\underset{k=1}{\overset{K}{\mathrm{\Σ}}}\frac{{\mathrm{EcIo}}_{j,k}\left(k\right)}{{\mathrm{EcIo}}_i\left(k\right)},j\≠i\end{array}\right.,$ EcIo wherein _{J, i}(k) be obtain with in the pilot strength measurement report message of i cdma network residential quarter as the terminal of main Serving cell, j the cdma network residential quarter that comprises in the k bar pilot strength measurement report message is to the pilot frequency intensity of i cdma network area interference, EcIo _i(k) be with in the pilot strength measurement report message of i cdma network residential quarter as the terminal of main Serving cell, the pilot frequency intensity of i the cdma network residential quarter that comprises in the k bar pilot strength measurement report message, M _iExpression is with the message sum of i cdma network residential quarter as the pilot strength measurement report message of the terminal of main Serving cell.

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