CN100499426C - Wireless network planning method of CDMA service - Google Patents

Abstract

This invention discloses a method for planning CDMA radio network. It separately calculates capacity A limited by covering of CDMA cell and capacity B limited by covering of CDMA cell according to original preset of loading. Uses the results of which the capacity A compares with capacity B to continually adjust the value of loading, then gets the loading of CDMA cell at the condition of balance of capacity and covering, then calculates the emission power of the base station Pbts_need, comparing the Pbts_need with Pbts, continually adjusts the loading value according to the result of comparing, finally gets the loading X of CDMA cell at the condition of covering an capacity balance, and in the condition of forward and reverse balance. Farther according to the above load X to calculate the parameter needed by planning the cell of CDMA network.

Description

A kind of wireless network planning method of CDMA service

Technical field

The present invention relates to the planning technology of wireless network, particularly relate to the professional wireless network planning method of a kind of code division multiple access (CDMA).

Background technology

Cdma system is a self-interference system, and the capacity of CDMA, covering and interference are interrelated, interactional.When carrying out cdma network planning, need the consideration zone that CDMA covered, because the service signal of CDMA must have enough power to reach the signal to noise ratio that needs at the purpose receiver end could be by correctly demodulation, so the interference level that must overcome is depended in the zone that CDMA can cover; On the other hand,, consider the cdma service effect of signals to being transmitted, therefore also need to consider the power system capacity of CDMA with sub-district and adjacent sub-district because the transmission of CDMA service signal will depend on the service conditions with sub-district and adjacent sub-district.

Traditional cdma network planing method is with capacity, covers and separately to plan, the cdma network of being planned or satisfy capacity perhaps satisfies covering.When according to capacity planning cdma network system, need be according to the corresponding traffic model of business, comprise that cell capacity and base station configuration etc. plan; When with coverage planning cdma network system, need plan according to the interference level of sub-district.

Though present cdma network utilizes these two kinds of planing methods can obtain corresponding C DMA network planning structure, but it does not fully take into account the inner link of capacity and covering in the cdma system, can't realize covering balance: when carrying out cdma network planning with capacity, if number of base stations according to capacity planning cdma network sub-district, suppose according to sub-district load to be 50% to set up number of base stations, then this number of base stations can be far longer than the required number of base stations of this cdma network sub-district initial capacity, the resource that will waste cdma system; If according to the number of base stations of coverage planning cdma network sub-district, then this number of base stations does not reach the required number of base stations of this cdma network sub-district later stage construction capacity, is unfavorable for the operation of cdma system.

In addition, development along with CDMA 1X system, cdma service develops into block domain data service and circuit domain data service from simple speech business, terminal also expands to travelling carriage and fixed station mixed networking from travelling carriage, that is to say support voice business, block domain data service and circuit domain data service simultaneously in the network of current CDMA 1X, and have travelling carriage and fixed station simultaneously.Because speech business, block domain data service and circuit domain data service have different essential characteristics, therefore when carrying out the network planning based on capacity, need plan according to the corresponding traffic model of miscellaneous service, and the feature that travelling carriage and fixed station show in the network coverage is also different, all these is carried out cdma network planning for the traditional network plan method of employing and has brought difficulty, and prior art can't be planned such network.

And since at present the reverse covering power of the fixed station that exists in the network greater than travelling carriage, it is limited forward business to occur in the bigger area of fixed station usage ratio, rather than the limited situation of traditional reverse traffic, adopt traditional network plan method also can't address this problem.Here, forward business is meant the business from the travelling carriage to the fixed station, and reverse traffic is meant the business from the fixed station to the travelling carriage.

Summary of the invention

In view of this, main purpose of the present invention is to provide a kind of wireless network planning method of cdma service, make power system capacity and the overlay area that to consider CDMA when cdma network planned simultaneously, and the limited situation of forward business in the cdma network, between obtaining capacity and covering, the balance between the preceding reverse traffic, save the resource of cdma system, and be beneficial to the operation of cdma system.

For reaching above purpose, technical scheme of the present invention is achieved in that a kind of wireless network planning method of CDMA service, and this method may further comprise the steps:

A. the interference margins of initialization iterations and code division multiple access (CDMA) network cell calculates the current load of cdma network sub-district according to initialized interference margins;

B. judge that whether the current iteration number of times is less than the iterations thresholding, if less than, then according to the current load in cdma network sub-district calculate respectively cover restriction down cdma network cell capacity A and the cdma network cell capacity B under the capacity limit, otherwise end planning process;

C. whether judge the poor absolute value of A and B less than the iteration precision thresholding, if less than, judge that then whether current load is greater than the maximum load thresholding, if, then finish this planning process, otherwise, enter step e, if described absolute value greater than the iteration precision thresholding, then enters steps d;

D. judge that A and B difference is greater than the iteration precision thresholding or less than negative iteration precision thresholding, if greater than the iteration precision thresholding, the step-length that current load increase is set then, load after the increase is as current load, and judge that whether current load is greater than the maximum load thresholding, if greater than, then finish this planning process, if less than, then iterations adds one, return step b, if less than negative iteration precision thresholding, then iterations adds one, and current load is reduced the step-length of setting, load after the minimizing is as current load, and returns step b;

E. the base station transmitting power that needs of calculation plot, and whether the absolute value of actual emission power difference of judging this base station transmitting power and setting is less than control iteration precision thresholding, if less than, then export the current load of sub-district, and enter step f, if greater than, then adjust current magnitude of load, and return step e;

F. calculate the required parameter of cdma network plot planning according to the current loadometer in sub-district of step e output.

Step a is described according to the interference margins assumed (specified) load to be: deduct negative ten/interference margins power of 10 with 1.

Step b may further comprise the steps according to the cell capacity A that cdma network sub-district LOAD FOR covers under the restriction:

B1. in the various parameter substitution Okumura propagation models or Cost231 propagation model with the sub-district load that provides and running environment, networking situation, the covering radius of the miscellaneous service of the various terminal correspondences in cdma network sub-district that obtain;

B2. with the covering radius of travelling carriage speech business output radius, calculate the commutation factor of the corresponding miscellaneous service of various terminals with the ratio meter of sub-district output radius according to the covering radius of the miscellaneous service of various terminal correspondences as the sub-district;

B3., the user density of sub-district and each user's capacity are set, according to the throughput value of covering radius, user density and each user's of the miscellaneous service of various terminal correspondences calculation of capacity miscellaneous service, again according to the value of the commutation factor calculated capacity A of the miscellaneous service of various terminal correspondences.

Step b is to utilize the soft block new probability formula calculation plot inner capacities of CDMA to limit the throughput of the miscellaneous service of various terminal correspondences down according to the cell capacity B under the LOAD FOR capacity limit of cdma network sub-district, and limits the capacity B of sub-district down according to the commutation factor calculated capacity among the step b2.

Among the described step e, the base station transmitting power that calculation plot needs further may further comprise the steps:

E1. calculate the number of users of the various pure business in cdma network sub-district according to the soft block new probability formula, and calculate the sub-district according to the distribution proportion of various pure business in the sub-district and allow the number of users that inserts simultaneously;

E2. the sub-district of calculating according to the step e1 number of users that allows simultaneously to insert carries out the forward link budget, obtains the maximum link loss that the sub-district allows;

E3. in the various parameter substitution forward-link capacity models of the maximum link loss, running environment and the networking situation that allow of the sub-district that obtains according to step e2, obtain the base station transmitting power that forward direction covers to be needed under the capacitance balance situation.

The thresholding of iterations described in the step b is according to the condition of convergence setting of the covering capacitance balance iterative algorithm of cdma network sub-district.

The described iteration precision thresholding of step c is according to the precision setting of the covering capacitance balance iterative algorithm of cdma network sub-district.

Maximum load thresholding described in the step c is according to the load setting of restriction cdma network sub-district maximum.

The current load of the described adjustment of step e further comprises: judge that base station transmitting power and actual emission power difference are greater than the control iteration precision or less than negative control iteration precision, if greater than, the step-length that load X is reduced to set then, load X after will reducing is as current load X, and return step e, if less than, then load X is increased the step-length of setting, load X after increasing as current load X, and is returned step e.

Control iteration precision threshold setting default value among the described step e is 0.1W.

Described step f further comprises: the sub-district of step e output is covered in the load and input parameter substitution Okumura propagation model or Cost231 propagation model of capacitance balance and preceding oppositely balance, calculate and export the covering radius and the capacity of the miscellaneous service of various terminal correspondences.

By such scheme as can be seen, the present invention calculates the cdma network sub-district respectively and covers restriction cdma network cell capacity A and the cdma network cell capacity B of cdma network cell capacity under limiting down, the equilibrium iteration that utilizes capacity A and capacity B to cover capacity calculates the load X that finally obtains cdma network sub-district under covering of cdma network sub-district and the capacitance balance, calculate the base station transmitting power Pbts_need under current covering and the capacitance balance situation again, the Pbts of this Pbts_need and input relatively, constantly adjust the value of load X according to comparative result, finally obtain the load X that the cdma network sub-district covers cdma network sub-district under capacitance balance and the preceding oppositely balance, finish the covering of cdma network sub-district and the planning under the capacitance balance, therefore, method of the present invention realized the cdma network sub-district cover and capacitance balance under planning, saved the resource of cdma system and be beneficial to the operation of cdma system.

Description of drawings

Fig. 1 realizes the preceding reverse balance of cdma network sub-district for the present invention and covers the planning flow chart of capacitance balance.

Embodiment

Below in conjunction with drawings and the specific embodiments technical solution of the present invention is described in further detail.

The present invention program at first calculates the cdma network sub-district respectively according to the initial load X that sets and covers restriction capacity A and the capacity B of cdma network cell capacity under limiting down, the result who utilizes capacity A and capacity B to compare mutually, constantly adjust the value of load X, obtain the load X of cdma network sub-district under covering of cdma network sub-district and the capacitance balance, calculate the base station transmitting power P under current covering and the capacitance balance situation again _{Bts_need}, this P relatively _{Bts_need}P with input _Bts, constantly adjust the value of load X according to comparative result, finally obtain the cdma network sub-district cover capacitance balance and before the reverse load X of cdma network sub-district under the balance, and then calculate cdma network plot planning parameters needed according to this load X.

Figure 1 shows that the present invention realizes the covering of cdma network sub-district and the idiographic flow of capacitance balance, the corresponding following steps of this flow process:

Step 100, determine input parameter according to running environment and networking situation, these parameters comprise:

A. cell environment, landform, the running frequency of cdma system, overlay area area, overlay area number of users, cdma system blocking probability and soft-switch proportion etc.;

B.CDMA link budget desired parameters comprises: antenna for base station type, the maximum transmission power of terminal in the sub-district, this terminal comprises fixed station and travelling carriage, base station feed line length, the FER of speech business, block domain data service and circuit domain data service, area coverage probability etc.;

C. the maximum transmission power of base station, Forward Paging Channel number and paging channel speed etc.;

D. user's distribution situation in the sub-district comprises evenly distributing or edge distribution;

E. characters of ground object can be " in the building ", " in the car ", " large mass of water ", " intensive number wood " and " other " etc.;

F. user distribution ratio in the sub-district, comprise: pure speech business user, pure block domain data service user, pure circuit domain data service and mixed service user's ratio, wherein the mixed service user comprises the user of speech business and block domain data service combination, speech business and circuit domain data service combination, speech business and block domain data service and circuit domain data service combination, and user's distribution proportion under each grade among block domain data service and the circuit domain data service user;

G. the distribution proportion of fixed station and travelling carriage, wherein fixed station need further provide the distribution proportion of exterior aerial fixed station and domestic aerial fixed station;

H. data service model input parameter comprises duration and the duty ratio of PPP Session, and wherein data service comprises block domain data service and circuit domain data service;

I. user of mobile station rate travel distribution proportion, promptly user of mobile station uses the statistics ratio of speech business and data service under various rate travels;

J. the height of terminal antenna gain and antenna for base station, gain etc.;

K. the reverse end correction factor of making an uproar before.

Step 101, initialization iterations, the initial value that is about to iterations is set to 1.

The interference margins of step 102, initialization cdma network sub-district, the initial value that interference margins promptly is set is 1, calculates the load X of cdma network sub-district then according to formula (1):

X=1-10 ^{-interference margins/10}(1)

Interference margins is 1 o'clock, and the current load X that can calculate the sub-district by formula (1) is 20.56%.

Step 103～126 are preceding reverse balance of carrying out the cdma network sub-district and the iterative computation that covers capacitance balance, and detailed process comprises:

Step 103, whether judge the current iteration number of times less than the thresholding 1 that sets, the iterations higher limit of this thresholding 1 for setting in advance, if greater than, then enter next step, otherwise, step 105 entered.

Be the covering of assurance cdma network sub-district and the convergence of capacitance balance iterative algorithm, this higher limit is set to a bigger number, such as being set to 10000.

Step 104, prompting " reaching the iterations upper limit ", and finish this planning process.

The reverse covering radius of the miscellaneous service of step 105, the various terminal correspondences of sub-district load X calculation plot that calculate according to step 102, calculate the throughput of the miscellaneous service of various terminal correspondences, and the throughput of the miscellaneous service of various terminal correspondences converted accordingly, obtain at the reverse throughput A that covers sub-district under the limited case.

The throughput A that calculates is the capacity A that covers sub-district under the limited case.Utilize the various parameters of step 100 and the detailed process of the cell throughout A under the sub-district load X calculating covering restriction to be:

The reverse covering radius of the miscellaneous service of the various terminal correspondences of calculation plot at first.When the cdma system operating frequency of sub-district at 150MHZ during to 1500MHZ, in the various parameter substitution Okumura propagation models with the sub-district load X that provides and input, calculate the reverse covering radius of the miscellaneous service of the various terminal correspondences in sub-district; When the cdma system operating frequency of sub-district when 1800MHZ is above, in the various parameter substitution Cost231 propagation models with the sub-district load that provides and input, calculate the reverse covering radius of the miscellaneous service of the various terminal correspondences in sub-district.

Get the output radius of the covering radius of travelling carriage speech business, calculate the commutation factor of the corresponding miscellaneous service of various terminals when the calculate throughput according to the covering radius and the ratio meter of the output radius of sub-district of the miscellaneous service of various terminal correspondences as the sub-district.

Calculate the throughput of miscellaneous service then according to the reverse covering radius of the miscellaneous service of the user density of sub-district, each user's capacity and various terminal correspondences, that is: when the base station of cdma network sub-district is three sector base stations, throughput=base station number * 1.949 coverage radius of cell ²* user density * each user's capacity; When the base station of cdma network sub-district is the omnidirectional station, throughput=base station number * 2.598 coverage radius of cell ²* user density * each user's capacity.For example: if obtain the sub-district area coverage through Okumura propagation model or Cost231 propagation model is 1KM ², and the user density of this sub-district is 100 people/KM ², the Irish capacity of each user's travelling carriage speech business is 0.02Erl, then the capacity under this sub-district covering restriction is 1KM ²* 100 people/KM ²* 0.02Erl=2Erl, correspondingly, its throughput is 2 * 0.4 * 9.6=7.68kbps.

The throughput commutation factor of calculating before utilizing is at last converted accordingly to the throughput of the miscellaneous service of various terminal correspondences, obtains promptly to cover the capacity A of sub-district under the limited case at the reverse throughput A that covers sub-district under the limited case.

Step 106, utilize the reverse throughput of the miscellaneous service of various terminal correspondences under the soft block formula calculation plot inner capacities limited case of CDMA, and the commutation factor calculated capacity restriction of calculating in service distribution ratio that provides according to step 100 and the step 105 reverse throughput B of mixed service of sub-district down.

The reverse throughput B of the mixed service that calculates is the capacity B of sub-district under the capacity limit situation.

The algorithm that calculates reverse throughput in the covering of this cdma network sub-district and the flow process of capacitance balance is as follows, calculates reverse throughput and be calculating M in formula (2):

$B_{\mathrm{cdma}}=Q\left(\frac{\frac{W}{R}{X}_0-\stackrel{\‾}{M}\stackrel{\‾}{\mathrm{\α}}\mathrm{\ρ}{e}^{\frac{1}{2}{\mathrm{\β}}^2{\mathrm{\σ}}^2}(1+\mathrm{\ϵ})}{\sqrt{\stackrel{\‾}{M}\stackrel{\‾}{{\mathrm{\α}}^2}{\mathrm{\ρ}}^2{e}^{2{\mathrm{\β}}^2{\mathrm{\σ}}^2}(1+\mathrm{\ϵ}\′)}}\right)---\left(2\right)$

Wherein:

$Q\left(x\right)={\∫}_x^{\∞}\frac{1}{2\mathrm{\π}}{e}^{-t^2/2}\mathrm{dt};$

In the formula (2), B _CdmaBe blocking rate, value is 1%～2% usually; W/R is a processing gain, obtains by simulated CD MA network cell system; α is average activity factor, and for speech business, its representative value is 0.4, and for block domain data service or circuit domain data service, its representative value is 1;

Be the second order activity factor; ε is the outer area interference factor, obtains by simulated CD MA network cell system; ε ' is the outer area interference factor of second order, obtains by simulated CD MA network cell system; σ is the demodulation threshold standard deviation, i.e. power control variance; ρ is the demodulation intermediate value, is

β=(ln10)/10, m _DBBe demodulation threshold, this demodulation threshold obtains by simulated CD MA network cell system; X ₀For cdma system blocks load, be the desired value of cdma network plot planning; M is cdma system Ireland capacity.

In formula (2), cdma network cell capacity, radio link quality, power control arithmetic accuracy correspond respectively to M, ρ, three variablees of σ.Formula (2) is illustrated in certain demodulation threshold (ρ), certain power control variance (σ), speech business, the activity factor (α) of block domain data service and circuit domain data service, certain area interference (ε and ε '), certain cell load (X ₀) under, certain soft block rate (B of system _Cdma) time cdma system capacity (M) value that obtains.

After calculating the reverse throughput of miscellaneous service of various terminal correspondences, the commutation factor calculated capacity restriction of calculating in service distribution ratio that provides according to step 100 and the step 105 is the reverse throughput B of mixed service of sub-district down, and the reverse throughput B of this mixed service is the capacity B of sub-district under the capacity limit situation.

Step 107, comparison A and B judge whether Abs (A-B)＜thresholding 2, if less than, then enter step 113; If greater than, then enter step 108.

Here, this thresholding 2 sets in advance according to arithmetic accuracy, such as being set to 0.01.

Step 108, judge A-B〉thresholding 2 still be A-B＜-thresholding 2, if A-B〉thresholding 2, enter next step, if A-B＜-thresholding 2, then enter step 112.

Step 109～111, current load X is increased predefined step-length, load X after obtaining increasing, whether the load X after judgement increases is greater than the thresholding 3 that is provided with, this threshold value 3 sets in advance according to the load of limited subscriber maximum, if greater than, then prompting " system load is excessive ", finish this planning process, if less than, then iterations is added 1 and will increase after load X as current load X, then return step 103.

Step 112, iterations is added 1 and current load X reduced predefined step-length, the load X after reducing as current load X, is returned step 103.

Step 113～115, whether judge current load X greater than thresholding 3, if, then prompting " system load is excessive ", and finish planning process; Otherwise the output sub-district covers the current load X of capacitance balance, and enters next step.

Step 116～118, according to the interference margins of current load X calculation plot, interference margins=1-10 ^-X/10Link budget according to the miscellaneous service of various terminal correspondences in the sub-district obtains the maximum link loss that the sub-district allows, calculate the reverse covering radius of the miscellaneous service of various terminal correspondences in the sub-district according to corresponding propagation model, and calculate the sub-district according to the soft block new probability formula and allow the number of users C that inserts simultaneously.

Obtain the maximum link loss that allowed according to the reverse link budget of the miscellaneous service of various terminal correspondences in the sub-district, utilize in this link load, the step 100 sub-district of the various parameters of input and output to cover the current load X of capacitance balance, according to existing Okumura propagation model or Cost231 propagation model respectively professional the and data service of computing voice satisfy and cover the propagation loss that requirement is allowed, and calculate the covering radius of the miscellaneous service of various terminal correspondences thus.

It is the reverse Irish number that at first calculates various pure business according to the soft block new probability formula that calculation plot allows the number of users C that inserts simultaneously, calculate total Irish number according to the business proportion of output in the step 100 and the reverse Irish number of various pure business again, this total Irish number is the sub-district and allows the number of users C that inserts simultaneously.

Step 119, carry out the forward link budget, obtain the maximum link loss that the sub-district allows, and, obtain to cover the base station transmitting power P that needs under the situation of capacitance balance at current forward direction according to forward-link capacity Model Calculation forward business power according to number of users C _{Bts_need}

The forward-link capacity model as shown in Equation (3).

$M\left(P_{\max }\right)=\begin{array}{c}{\mathrm{PG}}_{\mathrm{traf}}\\ K_{\mathrm{traf}}.\mathrm{\α}.{\mathrm{\ρ}}_{\mathrm{traf}}\end{array}[\frac{{10}^{-M\left(\mathrm{dB}\right)/10}.P_{\max }}{N_m{L}_T\left(R\right)+K_f.P_{\max }}-{\mathrm{\ρ}}_{\mathrm{pil}}-\frac{{\mathrm{\ρ}}_{\mathrm{sync}}}{{\mathrm{PG}}_{\mathrm{sync}}}-N_p\frac{{\mathrm{\ρ}}_{\mathrm{pag}}}{{\mathrm{PG}}_{\mathrm{pag}}}]---\left(3\right)$

In the formula (3), M (P _Max) be forward-link capacity, promptly system the number of users that can support simultaneously; P _MaxBe the base station maximum allowable power, calculating M (P _Max) time, set according to the ability of equipment, can get 10W, 20W or 50W, at present, the maximum transmission power of base station main flow is 20W; α is the voice activation factor, as the representative value of mobile communication, gets 0.4 for speech business, for packet domain and circuit domain data service, gets 1;

Be the processing gain of Traffic Channel, PG _SyncBe the processing gain of synchronizing channel, PG _PagProcessing gain for paging channel, these three processing gains are fixed value, obtain divided by the speed of various channels by the speed of CDMA chip, such as, the speed of CDMA chip is 1.2288M, service rate is 9.6K～153.6K, then the processing gain of Traffic Channel is 1.2288M/9.6K=128 ..., 1.2288M/153.6K=16, the speed of synchronizing channel is 1200bps, then the processing gain of synchronizing channel is 1.2288M/1200=1024, and the speed of paging channel is 4800bps, 9600bps, then the processing gain of paging channel is 1.2288M/4800=256,1.2288M/9600=128; ρ _TrafBe Traffic Channel demodulation threshold, ρ _PilBe pilot channel demodulation threshold, ρ _SyncBe synchronizing channel demodulation threshold, ρ _PagBe the paging channel demodulation thresholding, be the ability value of equipment; N _pBe cell paging channel number, be the capacity of equipment value, can get 1～7, with regard to present network actual demand, be taken as 1 and get final product; N _mBe thermal noise, be the representative value of mobile communication system; L _T(R),, be according to number of users C and carry out the maximum link loss that the forward link budget obtains the sub-district permission, K in fact corresponding to radius of society for the forward link decay _TrafBe the user distribution factor, K _fBe the forward direction integrated interference factor, it is inside and outside to comprise the sub-district, and M (dB) is the demodulation threshold surplus, these several simulation values that are system.

This step need be calculated the transmitting power of current base station according to formula (3), therefore with all P in the formula (3) _MaxReplace with P _{Bts_need}, accordingly, the M (P in the formula (3) _Max) replace with M (P _{Bts_need}), this M (P _{Bts_need}) be following the number of users that can support of current base station transmitting power, with this M (P _{Bts_need}) and other parameter substitution formula (3), calculate P _{Bts_need}

Step 120, comparison P _{Bts_need}And P _Bts, P _BtsFor the actual transmitting power that can support in base station, if Abs (P _{Bts_need}-P _Bts)＜thresholding 4, then preceding oppositely balance enters step 124, otherwise enters step 121.

Wherein, thresholding 4 is provided with by the user for the control iteration precision, and it is 0.1W that default value can be set.

Step 121～123, judgement P _{Bts_need}-P _BtsThresholding 4 still is P _{Bts_need}-P _BtsIf＜-thresholding 4 is P _{Bts_need}-P _BtsThresholding 4, then reduce load X, and return step 116, if P _{Bts_need}-P _Bts＜-thresholding 4 then increases load X, and returns step 116.

Step 124, the various parameters of utilizing input in the step 100 and the current load X of output, according to existing Okumura propagation model or Cost231 propagation model respectively professional the and data service of computing voice satisfy and cover the propagation loss that requirement is allowed, and calculate the covering radius of the miscellaneous service of various terminal correspondences thus.

Step 125, output sub-district covering capacity and before the reverse load X of sub-district after the balance, export the covering radius, cell capacity of the miscellaneous service of various terminal correspondences etc., and enter step 126.

Step 126, finish this planning process.

According to the preceding reverse balance of this cdma network sub-district with cover the cdma network sub-district balancing load X that exports in the flow process of capacitance balance, can utilize Okumura propagation model or Cost231 propagation model to calculate the capacity of miscellaneous service of the various terminal correspondences of covering radius and cdma network sub-district of the miscellaneous service of these various terminal correspondences in cdma network sub-district respectively, obtain before the cdma network sub-district oppositely and cover the required parameter of capacitance balance planning, as relevant output parameters such as cdma network sub-district mixing capacity and base station configuration.

Claims (11)

1, a kind of wireless network planning method of CDMA service is characterized in that this method may further comprise the steps:

A. the interference margins of initialization iterations and code division multiple access (CDMA) network cell calculates the current load of cdma network sub-district according to initialized interference margins;

B. judge that whether the current iteration number of times is less than the iterations thresholding, if less than, then according to the current load in cdma network sub-district calculate respectively cover restriction down cdma network cell capacity A and the cdma network cell capacity B under the capacity limit, otherwise end planning process;

C. whether judge the poor absolute value of A and B less than the iteration precision thresholding, if less than, judge that then whether current load is greater than the maximum load thresholding, if, then finish this planning process, otherwise, enter step e, if described absolute value greater than the iteration precision thresholding, then enters steps d;

D. judge that A and B difference is greater than the iteration precision thresholding or less than negative iteration precision thresholding, if greater than the iteration precision thresholding, the step-length that current load increase is set then, load after the increase is as current load, and judge that whether current load is greater than the maximum load thresholding, if greater than, then finish this planning process, if less than, then iterations adds one, return step b, if less than negative iteration precision thresholding, then iterations adds one, and current load is reduced the step-length of setting, load after the minimizing is as current load, and returns step b;

E. the base station transmitting power that needs of calculation plot, and whether the absolute value of actual emission power difference of judging this base station transmitting power and setting is less than control iteration precision thresholding, if less than, then export the current load of sub-district, and enter step f, if greater than, then adjust current magnitude of load, and return step e;

F. calculate the required parameter of cdma network plot planning according to the current loadometer in sub-district of step e output.

2, method according to claim 1 is characterized in that, step a is described according to the interference margins assumed (specified) load to be: deduct negative ten/interference margins power of 10 with 1.

3, method according to claim 1 is characterized in that, step b may further comprise the steps according to the cell capacity A that cdma network sub-district LOAD FOR covers under the restriction:

B1. in the various parameter substitution Okumura propagation models or Cost231 propagation model with the sub-district load that provides and running environment, networking situation, the covering radius of the miscellaneous service of the various terminal correspondences in cdma network sub-district that obtain;

B2. with the covering radius of travelling carriage speech business output radius, calculate the commutation factor of the corresponding miscellaneous service of various terminals with the ratio meter of sub-district output radius according to the covering radius of the miscellaneous service of various terminal correspondences as the sub-district;

B3., the user density of sub-district and each user's capacity are set, according to the throughput value of covering radius, user density and each user's of the miscellaneous service of various terminal correspondences calculation of capacity miscellaneous service, again according to the value of the commutation factor calculated capacity A of the miscellaneous service of various terminal correspondences.

4, method according to claim 3, it is characterized in that, step b is to utilize the soft block new probability formula calculation plot inner capacities of CDMA to limit the throughput of the miscellaneous service of various terminal correspondences down according to the cell capacity B under the LOAD FOR capacity limit of cdma network sub-district, and limits the capacity B of sub-district down according to the commutation factor calculated capacity among the step b2.

5, method according to claim 1 is characterized in that among the described step e, and the base station transmitting power that calculation plot needs further may further comprise the steps:

E1. calculate the number of users of the various pure business in cdma network sub-district according to the soft block new probability formula, and calculate the sub-district according to the distribution proportion of various pure business in the sub-district and allow the number of users that inserts simultaneously;

E2. the sub-district of calculating according to the step e1 number of users that allows simultaneously to insert carries out the forward link budget, obtains the maximum link loss that the sub-district allows;

E3. in the various parameter substitution forward-link capacity models of the maximum link loss, running environment and the networking situation that allow of the sub-district that obtains according to step e2, obtain the base station transmitting power that forward direction covers to be needed under the capacitance balance situation.

6, method according to claim 1 is characterized in that, the thresholding of iterations described in the step b is according to the condition of convergence setting of the covering capacitance balance iterative algorithm of cdma network sub-district.

7, method according to claim 1 is characterized in that, the described iteration precision thresholding of step c is according to the precision setting of the covering capacitance balance iterative algorithm of cdma network sub-district.

8, method according to claim 1 is characterized in that, the maximum load thresholding described in the step c is according to the load setting of restriction cdma network sub-district maximum.

9, method according to claim 1, it is characterized in that, the current load of the described adjustment of step e further comprises: judge that base station transmitting power and actual emission power difference are greater than the control iteration precision or less than the control iteration precision of bearing, if greater than, the step-length that load X is reduced to set then, load X after will reducing is as current load X, and return step e, if less than, then load X is increased the step-length of setting, load X after increasing as current load X, and is returned step e.

10, method according to claim 1 is characterized in that, the control iteration precision threshold setting default value among the described step e is 0.1W.

11, method according to claim 1, it is characterized in that, described step f further comprises: the sub-district of step e output is covered in the load and input parameter substitution Okumura propagation model or Cost231 propagation model of capacitance balance and preceding oppositely balance, calculate and export the covering radius and the capacity of the miscellaneous service of various terminal correspondences.

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