CN102186205A - Method for acquiring utilization rate of wireless network of global system for mobile communication - Google Patents

Abstract

The invention provides a method for acquiring the utilization rate of a wireless network of a global system for mobile communication, wherein the method comprises the steps of: acquiring network parameters, including the number of cells in full network, full network full-rate voice traffic of the system in busy hour, full-network half-rate voice traffic of the system in busy hour, full-rate voice traffic of cells in full network in busy hour and half-rate voice traffic of cells in full network in busy hour; according to network parameters as well as predetermined call loss probability and the number of channels per carrier frequency, acquiring full-network voice traffic of the system in busy hour and the voice traffic which needs to be configured in full network, in order to acquire the utilization rate of the wireless network of the global system for mobile communication. By adopting the method for acquiring the utilization rate of the wireless network of the global system for mobile communication, provided by the invention, wireless capacity matched with the traffic within a period of time can be obtained in order to acquire the best utilization rate of wireless network resources of the GSM (Global System for Mobile communication).

Description

The acquisition methods of global system for mobile communications wireless network utilance

Technical field

The invention belongs to communication technical field, relate to a kind of acquisition methods of global system for mobile communications wireless network utilance.

Background technology

Mobile Network Operator is at operation global system for mobile communications (Global System for Mobile Communications in the prior art, to call GSM in the following text) during wireless network, need obtain the gsm wireless network resource utilization of various places reality according to the speech business telephone traffic of various places in a period of time, but do not analyze at the gsm wireless network resource utilization of various places pairing the best of speech business telephone traffic in a period of time, therefore, need obtain a kind of wireless network utilance solves the above problems.

Summary of the invention

At the above-mentioned defective of prior art, the embodiment of the invention provides a kind of acquisition methods of global system for mobile communications wireless network utilance.

The embodiment of the invention provides a kind of acquisition methods of global system for mobile communications wireless network utilance, comprising:

Obtain network parameter, described network parameter comprises: half-rate speech telephone traffic during the busy cells of each sub-district in full-speed voice telephone traffic and the whole network during the busy cells of each sub-district in the whole network half-rate speech telephone traffic, the whole network when the whole network full-speed voice telephone traffic, system busy when the whole network number of cells, system busy;

The whole network voice telephone traffic amount when the whole network half-rate speech telephone traffic is obtained system busy when the whole network full-speed voice telephone traffic and described system busy during according to described system busy; According to half-rate speech telephone traffic and described the whole network number of cells during the busy cells of each sub-district in full-speed voice telephone traffic, the whole network during the busy cells of each sub-district in described the whole network, and the predetermined percent of call lost and the number of channel of every carrier frequency, obtain the voice telephone traffic capacity that the whole network need dispose;

The voice telephone traffic capacity of the whole network voice telephone traffic amount and described the whole network needs configuration obtains global system for mobile communications wireless network utilance during according to described system busy.

The embodiment of the invention provides a kind of acquisition methods of global system for mobile communications wireless network utilance, comprising:

Obtain network parameter, described network parameter comprises: the whole network half-rate speech telephone traffic when the whole network full-speed voice telephone traffic, system busy when the whole network number of cells, the whole network list carrier cell quantity, system busy;

The whole network half-rate speech telephone traffic and described the whole network number of cells when the whole network full-speed voice telephone traffic, described system busy during according to described system busy, average every sub-district voice telephone traffic amount when obtaining system busy; Average every sub-district voice telephone traffic amount during according to described the whole network number of cells, described the whole network list carrier cell quantity and described system busy, and voice unbalance factor when the predetermined percent of call lost and busy cells are obtained the voice telephone traffic capacity that average every sub-district need dispose;

The voice telephone traffic capacity of average every sub-district voice telephone traffic amount and described average every sub-district needs configuration obtains global system for mobile communications wireless network utilance during according to described system busy.

The acquisition methods of the global system for mobile communications wireless network utilance that the embodiment of the invention provides, by according to the network parameter that from network management system, obtains, obtain global system for mobile communications wireless network utilance, realized to obtain at the telephone traffic in a period of time the wireless capacity of coupling, to obtain the gsm wireless network resource utilization of corresponding the best.

Description of drawings

Fig. 1 is the acquisition methods embodiment flow chart of global system for mobile communications wireless network utilance of the present invention;

Fig. 2 is another embodiment flow chart of acquisition methods of global system for mobile communications wireless network utilance of the present invention;

The error analysis schematic diagram of the global system for mobile communications wireless network utilance that Fig. 3 obtains for two kinds of methods that the present invention uses in embodiment illustrated in fig. 1 and embodiment illustrated in fig. 2.

Embodiment

For the purpose, technical scheme and the advantage that make the embodiment of the invention clearer, below in conjunction with the accompanying drawing in the embodiment of the invention, technical scheme in the embodiment of the invention is clearly and completely described, obviously, described embodiment is the present invention's part embodiment, rather than whole embodiment.Based on the embodiment among the present invention, those of ordinary skills belong to the scope of protection of the invention not making the every other embodiment that is obtained under the creative work prerequisite.

The present invention is directed in the prior art not at the gsm wireless network resource utilization of various places pairing the best of speech business telephone traffic in a period of time and defective such as analyze, the network parameter that a solution promptly obtains from network management system by basis has been proposed, obtain global system for mobile communications wireless network utilance, realized to obtain at the telephone traffic in a period of time the wireless capacity of coupling, to obtain the gsm wireless network resource utilization of corresponding the best.

Fig. 1 is the acquisition methods embodiment flow chart of global system for mobile communications wireless network utilance of the present invention, and as shown in Figure 1, this method comprises:

Step 100, obtain network parameter, described network parameter comprises: half-rate speech telephone traffic during the busy cells of each sub-district in full-speed voice telephone traffic and the whole network during the busy cells of each sub-district in the whole network half-rate speech telephone traffic, the whole network when the whole network full-speed voice telephone traffic, system busy when the whole network number of cells, system busy;

Step 101, the whole network voice telephone traffic amount when the whole network half-rate speech telephone traffic is obtained system busy when the whole network full-speed voice telephone traffic and described system busy during according to described system busy; According to half-rate speech telephone traffic and described the whole network number of cells during the busy cells of each sub-district in full-speed voice telephone traffic, the whole network during the busy cells of each sub-district in described the whole network, and the predetermined percent of call lost and the number of channel of every carrier frequency, obtain the voice telephone traffic capacity that the whole network need dispose;

Step 102, the voice telephone traffic capacity of the whole network voice telephone traffic amount and described the whole network needs configuration obtains global system for mobile communications wireless network utilance during according to described system busy.

In the present embodiment, can use following formula according to the network parameter that obtains and obtain global system for mobile communications wireless network utilance from network management system, formula is:

$\mathrm{\α}=\frac{A_{\mathrm{tch}}+\frac{1}{2}{A}_{\mathrm{tch}/\mathrm{HS}}}{\underset{i=1}{\overset{N}{\mathrm{\Σ}}}{C}_i}$ Wherein,

$C_i=\mathrm{GETA}\left\{\mathrm{ROUNDUP}\right[\frac{\mathrm{GETN}(A_i+\frac{1}{2}{A}_i^{\′},E)}{M}]\×M,E\}$

Wherein:

α is described global system for mobile communications wireless network utilance;

A _TchThe whole network full-speed voice telephone traffic during for described system busy;

A _Tch/HSThe whole network half-rate speech telephone traffic during for described system busy;

N is described the whole network number of cells;

A _iFull-speed voice telephone traffic when being i sub-district busy cells;

A ' _iHalf-rate speech telephone traffic when being i sub-district busy cells;

C _iIt is the voice telephone traffic capacity that i sub-district need dispose;

E is the described percent of call lost;

M is the number of channel of described every carrier frequency, gets 8 for the GSM net;

GETN is according to telephone traffic, the percent of call lost and ERL-B table, calculates the function of the required number of channel with linear interpolation;

GETA is according to the number of channel, the percent of call lost and ERL-B table, calculates the function of telephone traffic with linear interpolation;

ROUNDUP is the function that rounds up.

Particularly, the network parameter that obtains comprises: half-rate speech telephone traffic during the busy cells of each sub-district in full-speed voice telephone traffic and the whole network during the busy cells of each sub-district in the whole network half-rate speech telephone traffic, the whole network when the whole network full-speed voice telephone traffic, system busy when the whole network number of cells, system busy;

The whole network voice telephone traffic amount when the molecule in the formula is system busy, be specially: the whole network voice telephone traffic amount when the whole network half-rate speech telephone traffic is obtained system busy when the whole network full-speed voice telephone traffic and system busy during according to system busy, because being the full-speed voice telephone traffic, the voice telephone traffic amount of the actual generation of the whole network adds total voice telephone traffic amount of half-rate speech telephone traffic, can significantly absorb traffic if enable half rate in a large number, the whole network half-rate speech telephone traffic when therefore wanting taking into account system busy;

Denominator in the formula is the voice telephone traffic capacity that the whole network need dispose, be specially: according to full-speed voice telephone traffic during the busy cells of each sub-district in the whole network, the half-rate speech telephone traffic and the predetermined percent of call lost during busy cells of each sub-district in the whole network, the voice channel number that each sub-district need dispose when utilizing the GETN function to obtain busy cells, wherein, the predetermined percent of call lost is predefined according to the concrete condition of each local network, the voice channel number of each sub-district needs configuration is divided by the number of channel of every carrier frequency during again according to the busy cells obtained, utilize the ROUNDUP function that rounds up to obtain the carrier frequency quantity that each sub-district need dispose, the number of channel that the product of the carrier frequency quantity that each sub-district need dispose and the number of channel of every carrier frequency need dispose for each sub-district; The number of channel and the predetermined percent of call lost according to each sub-district needs configuration of obtaining, utilize the GETA function to obtain the voice telephone traffic capacity that each sub-district need dispose, the voice telephone traffic capacity that need dispose all sub-districts in the whole network adds up at last, obtains the voice telephone traffic capacity that the whole network need dispose; Wherein, the number of channel in the telephone traffic in the GETN function, the GETA function does not round, and calculates with linear interpolation by the ERL-B table.

The ratio of molecule and the denominator voice telephone traffic capacity that the whole network voice telephone traffic amount need dispose divided by the whole network during promptly with system busy obtains global system for mobile communications wireless network utilance.

The acquisition methods of the global system for mobile communications wireless network utilance that the embodiment of the invention provides, by the network parameter that obtains, obtain global system for mobile communications wireless network utilance, realized to obtain at the telephone traffic in a period of time the wireless capacity of coupling, to obtain the gsm wireless network resource utilization of corresponding the best.Fig. 2 is another embodiment flow chart of acquisition methods of global system for mobile communications wireless network utilance of the present invention, and as shown in Figure 2, this method comprises:

Step 200 is obtained network parameter, and described network parameter comprises: the whole network half-rate speech telephone traffic when the whole network full-speed voice telephone traffic, system busy when the whole network number of cells, the whole network list carrier cell quantity, system busy;

Step 201, the whole network half-rate speech telephone traffic and described the whole network number of cells when the whole network full-speed voice telephone traffic, described system busy during according to described system busy, average every sub-district voice telephone traffic amount when obtaining system busy; Average every sub-district voice telephone traffic amount during according to described the whole network number of cells, described the whole network list carrier cell quantity and described system busy, and voice unbalance factor when the predetermined percent of call lost and busy cells are obtained the voice telephone traffic capacity that average every sub-district need dispose;

Step 202, the voice telephone traffic capacity of average every sub-district voice telephone traffic amount and described average every sub-district needs configuration obtains global system for mobile communications wireless network utilance during according to described system busy.

In the present embodiment, can use following formula according to the network parameter that obtains and obtain global system for mobile communications wireless network utilance from network management system, formula is:

$\mathrm{\α}=\frac{(A_{\mathrm{tch}}+\frac{1}{2}{A}_{\mathrm{tch}/\mathrm{HS}})/N}{\mathrm{GETA}\left\{\mathrm{GETN}\right[\frac{(A_{\mathrm{tch}}+\frac{1}{2}{A}_{\mathrm{tch}/\mathrm{HS}})}{N}\×\mathrm{\β},E]+P,E\}}$

Wherein,

$P=\frac{L}{N}\×2.5+(1-\frac{L}{N})\×4,$

Wherein:

α is described global system for mobile communications wireless network utilance;

A _TchThe whole network full-speed voice telephone traffic during for described system busy;

A _Tch/HSThe whole network half-rate speech telephone traffic during for described system busy;

N is described the whole network number of cells;

L is described the whole network list carrier cell quantity;

P is the number of channel that described average every sub-district polygamy is put;

Voice unbalance factor when β is described busy cells;

E is the described percent of call lost;

GETN is according to telephone traffic, the percent of call lost and ERL-B table, calculates the function of the required number of channel with linear interpolation;

GETA is according to the number of channel, the percent of call lost and ERL-B table, calculates the function of telephone traffic with linear interpolation.

Particularly, the network parameter that obtains comprises: the whole network half-rate speech telephone traffic when the whole network full-speed voice telephone traffic, system busy when the whole network number of cells, the whole network list carrier cell quantity, system busy;

Average every sub-district voice telephone traffic amount when the molecule in the formula is system busy, be specially: the whole network voice telephone traffic amount when the whole network half-rate speech telephone traffic is obtained system busy when the whole network full-speed voice telephone traffic and system busy during according to system busy, because being the full-speed voice telephone traffic, the voice telephone traffic amount of the actual generation of the whole network adds total voice telephone traffic amount of half-rate speech telephone traffic, can significantly absorb traffic if enable half rate in a large number, the whole network half-rate speech telephone traffic when therefore wanting taking into account system to hurry, average every sub-district voice telephone traffic amount when the whole network voice telephone traffic amount is obtained system busy divided by the whole network number of cells during again with the system busy obtained;

Denominator in the formula is the voice telephone traffic capacity that average every sub-district need dispose, be specially: average every sub-district voice telephone traffic amount when the voice unbalance factor obtained busy cells when average every sub-district voice telephone traffic amount multiply by predetermined busy cells during according to the system busy obtained, wherein, the voice unbalance factor is a definite value for concrete network during busy cells, during busy cells the voice unbalance factor be voice telephone traffic amount sum during according to each sub-district of the whole network busy cells during divided by system busy the whole network voice telephone traffic amount obtain, the average every sub-district voice telephone traffic amount and the predetermined percent of call lost during again according to the busy cells obtained, the number of channel that each sub-district need dispose when utilizing the GETN function to obtain busy cells, wherein, the predetermined percent of call lost is predefined according to the concrete condition of each local network, the number of channel of each sub-district needs configuration adds that the number of channel that average every sub-district polygamy is put obtains the number of channel of average every sub-district actual disposition during then according to the busy cells obtained, the last number of channel and the predetermined percent of call lost according to each sub-district actual disposition of obtaining utilize the GETA function to obtain the voice telephone traffic capacity that average every sub-district need dispose; Wherein, the number of channel in the telephone traffic in the GETN function, the GETA function does not round, and calculates with linear interpolation by the ERL-B table;

The ratio of molecule and the denominator voice telephone traffic capacity that average every sub-district voice telephone traffic amount need dispose divided by average every sub-district during promptly with system busy obtains global system for mobile communications wireless network utilance.

Wherein, the number of channel that average every sub-district polygamy in the present embodiment is put is for each sub-district, because modular arrangements, cause the inevitable number of channel of the number of channel of actual disposition more than actual needs, for example the number of channel minimum for GSM net polygamy is 0, be to the maximum and approach 8, be distributed in [0,8) in the scope, the statistics of listing 5 cities, 4 provinces wherein below is as shown in table 1: it is little to know that each interval sub-district number accounts for total proportional difference, and polygamy number of channel average be 4 about, be half of 8 channels of every carrier frequency, in the ideal case, each interval sub-district number waits generally substantially, and polygamy number of channel average is 4.

For the more districts and cities of single carrier cell, can do certain correction to the number of channel P value that average every sub-district polygamy is put, suitably reduce the value of P, see above-mentioned formula.

Table 1

The acquisition methods of the global system for mobile communications wireless network utilance that provides in embodiment illustrated in fig. 2 is according to the network parameter that obtains from network management system, the voice telephone traffic capacity that average every sub-district voice telephone traffic amount need dispose than last average every sub-district during with system busy directly obtains global system for mobile communications wireless network utilance, the acquisition methods of the global system for mobile communications wireless network utilance that provides in embodiment illustrated in fig. 1 be according in the whole network during the busy cells of each sub-district in full-speed voice telephone traffic and the whole network during the busy cells of each sub-district the half-rate speech telephone traffic calculate the voice telephone traffic capacity that obtains each sub-district needs configuration of the whole network, obtain the voice telephone traffic capacity that the whole network need dispose after adding up again, the ratio of the voice telephone traffic capacity of the whole network voice telephone traffic amount and the whole network needs configuration during again according to system busy, obtain global system for mobile communications wireless network utilance, method in embodiment illustrated in fig. 2 can conveniently be obtained network utilization fast than the method in embodiment illustrated in fig. 1, error is very little, the error analysis schematic diagram of the global system for mobile communications wireless network utilance that Fig. 3 obtains for two kinds of methods that the present invention uses in embodiment illustrated in fig. 1 and embodiment illustrated in fig. 2, as shown in Figure 3, using two kinds of methods calculates the data in the existing network network management system of 48 districts and cities in 6 provinces, error between the result of the global system for mobile communications wireless network utilance that two kinds of methods are obtained is analyzed, ordinate represents to use the error that global system for mobile communications wireless network utilance that the method in embodiment illustrated in fig. 2 obtains deducts the global system for mobile communications wireless network utilance that the method in embodiment illustrated in fig. 1 of using obtains among the figure, article 3, on behalf of the different percents of call lost, curve be respectively 1%, 2%, 3%, error be on the occasion of, great majority can satisfy the purposes on the engineering between-0.5%～0%.

The acquisition methods of the global system for mobile communications wireless network utilance that the embodiment of the invention provides, by according to the network parameter that from network management system, obtains, directly obtain global system for mobile communications wireless network utilance, realized to obtain the wireless network utilance easily and fast, avoid extracting the cell-level data, and the less purposes that can satisfy on the engineering of error has improved operating efficiency, is convenient to the utilization of resources situation that operator grasps wireless network in real time.

In the current macroscopic view planning, satisfying the wireless capacity of a period of time expection and experience that required carrier frequency number mainly still depends on the project planner estimates, the acquisition methods embodiment of the global system for mobile communications wireless network utilance that application the invention described above provides just can predict quantitatively that concrete steps are:

Step 1 according to telephone traffic of the following a period of time the whole network of traffic forecast and the number of cells that the whole network comprises, is obtained the following average every cell telephone traffic amount that satisfies;

Step 2, the formula of using among the embodiment two provided by the invention obtains global system for mobile communications wireless network utilance;

Step 3, with the global system for mobile communications wireless network utilance that the telephone traffic of following a period of time the whole network of predicting is obtained divided by step 2, the telephone traffic that the following a period of time the whole network of prediction need dispose;

Step 4, the telephone traffic of the whole network needs configuration is obtained the carrier frequency quantity of the whole network needs configuration according to following a period of time of prediction.

It should be noted that especially, there is traffic burst phenomenon in the Spring Festival in many districts and cities, the prediction following a period of time the whole network telephone traffic with the Spring Festival peaked traffic be that the basis is an optimum, this moment, the value of voice unbalance factor during busy cells was as the criterion must be with the Spring Festival time, because the different time unbalance factor is widely different, especially the Spring Festival unbalance factor value much smaller than on ordinary days.

The acquisition methods of the global system for mobile communications wireless network utilance that the embodiment of the invention provides, by according to the network parameter that from network management system, obtains, directly obtain global system for mobile communications wireless network utilance, realized to obtain the wireless network utilance easily and fast, wireless capacity that prediction is following and required carrier frequency number, be convenient to operator and be used for macroscopic view planning, for the construction of wireless network provides reference frame.

One of ordinary skill in the art will appreciate that: all or part of step that realizes said method embodiment can be finished by the relevant hardware of program command, aforesaid program can be stored in the computer read/write memory medium, this program is carried out the step that comprises said method embodiment when carrying out; And aforesaid storage medium comprises: various media that can be program code stored such as ROM, RAM, magnetic disc or CD.

It should be noted that at last: above embodiment only in order to technical scheme of the present invention to be described, is not intended to limit; Although with reference to previous embodiment the present invention is had been described in detail, those of ordinary skill in the art is to be understood that: it still can be made amendment to the technical scheme that aforementioned each embodiment put down in writing, and perhaps part technical characterictic wherein is equal to replacement; And these modifications or replacement do not make the essence of appropriate technical solution break away from the spirit and scope of various embodiments of the present invention technical scheme.

Claims (4)

1. the acquisition methods of a global system for mobile communications wireless network utilance is characterized in that, comprising:

Obtain network parameter, described network parameter comprises: half-rate speech telephone traffic during the busy cells of each sub-district in full-speed voice telephone traffic and the whole network during the busy cells of each sub-district in the whole network half-rate speech telephone traffic, the whole network when the whole network full-speed voice telephone traffic, system busy when the whole network number of cells, system busy;

The whole network voice telephone traffic amount when the whole network half-rate speech telephone traffic is obtained system busy when the whole network full-speed voice telephone traffic and described system busy during according to described system busy; According to half-rate speech telephone traffic and described the whole network number of cells during the busy cells of each sub-district in full-speed voice telephone traffic, the whole network during the busy cells of each sub-district in described the whole network, and the predetermined percent of call lost and the number of channel of every carrier frequency, obtain the voice telephone traffic capacity that the whole network need dispose;

The voice telephone traffic capacity of the whole network voice telephone traffic amount and described the whole network needs configuration obtains global system for mobile communications wireless network utilance during according to described system busy.

2. the acquisition methods of global system for mobile communications wireless network utilance according to claim 1, it is characterized in that, the voice telephone traffic capacity of described the whole network voice telephone traffic amount and the configuration of described the whole network needs during according to described system busy, obtain global system for mobile communications wireless network utilance and comprise:

Use following formula and obtain described global system for mobile communications wireless network utilance, wherein, the whole network voice telephone traffic amount when the molecule in the described formula is described system busy, denominator is the voice telephone traffic capacity that described the whole network need dispose, described formula is:

$\mathrm{\α}=\frac{A_{\mathrm{tch}}+\frac{1}{2}{A}_{\mathrm{tch}/\mathrm{HS}}}{\underset{i=1}{\overset{N}{\mathrm{\Σ}}}{C}_i}$ Wherein,

$C_i=\mathrm{GETA}\left\{\mathrm{ROUNDUP}\right[\frac{\mathrm{GETN}(A_i+\frac{1}{2}{A}_i^{\′},E)}{M}]\×M,E\}$

Wherein:

α is described global system for mobile communications wireless network utilance;

A _TchThe whole network full-speed voice telephone traffic during for described system busy;

A _Tch/HSThe whole network half-rate speech telephone traffic during for described system busy;

N is described the whole network number of cells;

A _iFull-speed voice telephone traffic when being i sub-district busy cells;

A ' _iHalf-rate speech telephone traffic when being i sub-district busy cells;

C _iIt is the voice telephone traffic capacity that i sub-district need dispose;

E is the described percent of call lost;

M is the number of channel of described every carrier frequency, gets 8 for the GSM net;

GETN is according to telephone traffic, the percent of call lost and ERL-B table, calculates the function of the required number of channel with linear interpolation;

GETA is according to the number of channel, the percent of call lost and ERL-B table, calculates the function of telephone traffic with linear interpolation;

ROUNDUP is the function that rounds up.

3. the acquisition methods of a global system for mobile communications wireless network utilance is characterized in that, comprising:

Obtain network parameter, described network parameter comprises: the whole network half-rate speech telephone traffic when the whole network full-speed voice telephone traffic, system busy when the whole network number of cells, the whole network list carrier cell quantity, system busy;

The whole network half-rate speech telephone traffic and described the whole network number of cells when the whole network full-speed voice telephone traffic, described system busy during according to described system busy, average every sub-district voice telephone traffic amount when obtaining system busy; Average every sub-district voice telephone traffic amount during according to described the whole network number of cells, described the whole network list carrier cell quantity and described system busy, and voice unbalance factor when the predetermined percent of call lost and busy cells are obtained the voice telephone traffic capacity that average every sub-district need dispose;

The voice telephone traffic capacity of average every sub-district voice telephone traffic amount and described average every sub-district needs configuration obtains global system for mobile communications wireless network utilance during according to described system busy.

4. the acquisition methods of global system for mobile communications wireless network utilance according to claim 3, it is characterized in that, the voice telephone traffic capacity of described average every sub-district voice telephone traffic amount and the configuration of described average every sub-district needs during according to described system busy, obtain global system for mobile communications wireless network utilance and comprise:

Use following formula and obtain described global system for mobile communications wireless network utilance, wherein, average every sub-district voice telephone traffic amount when the molecule in the described formula is described system busy, denominator is the voice telephone traffic capacity that described average every sub-district need dispose, described formula is:

$\mathrm{\α}=\frac{(A_{\mathrm{tch}}+\frac{1}{2}{A}_{\mathrm{tch}/\mathrm{HS}})/N}{\mathrm{GETA}\left\{\mathrm{GETN}\right[\frac{(A_{\mathrm{tch}}+\frac{1}{2}{A}_{\mathrm{tch}/\mathrm{HS}})}{N}\×\mathrm{\β},E]+P,E\}}$

Wherein,

$P=\frac{L}{N}\×2.5+(1-\frac{L}{N})\×4,$

Wherein:

α is described global system for mobile communications wireless network utilance;

A _TchThe whole network full-speed voice telephone traffic during for described system busy;

A _Tch/HSThe whole network half-rate speech telephone traffic during for described system busy;

N is described the whole network number of cells;

L is described the whole network list carrier cell quantity;

P is the number of channel that described average every sub-district polygamy is put;

Voice unbalance factor when β is described busy cells;

E is the described percent of call lost;

GETN is according to telephone traffic, the percent of call lost and ERL-B table, calculates the function of the required number of channel with linear interpolation;

GETA is according to the number of channel, the percent of call lost and ERL-B table, calculates the function of telephone traffic with linear interpolation.

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