JP3479484B2 - Communication quality calculation method and communication quality calculation device for mobile communication system - Google Patents

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a communication quality calculation method and a communication quality calculation device for a mobile communication system.
More specifically, the present invention relates to a method and apparatus for calculating quality such as a call loss rate at a base station (probability that a new call cannot be accepted by the system) and a probability that communication quality is deteriorated due to traffic concentration.

[0002]

2. Description of the Related Art In a mobile communication system such as a mobile phone which is widely used at present, the entire service area is divided into relatively small areas called cells 106 to provide services. In such a system, for example, as shown in FIG. 1, a plurality of base stations 102 that cover a divided cell 106 and a mobile station 104 that communicates by setting a wireless channel between these base stations 102 are used. It is configured.

A radio wave transmitted from the base station 102 or the mobile station 104 with a certain transmission power propagates in space while being attenuated and reaches a reception point. Basically, the amount of attenuation that a radio wave receives increases as the distance between the transmitting point and the receiving point increases. In addition, since radio waves are blocked, reflected, or diffracted by large buildings, mountains, hills, etc., the propagation loss varies greatly not only with the distance between the transmitting and receiving points but also with the surrounding topography and the condition of features. Come on. on the other hand,
The receiving side requires a certain level or more of received power to receive and demodulate signals with a certain quality, and how to efficiently cover the service area with limited transmission power is an important factor in the area design of mobile communication. Is important to.

For such a design, a method of evaluating a radio wave propagation situation in a service area by simulating radio wave propagation based on specifications of a base station or a mobile station or topographical data using a computer is adopted. Sometimes. For example, Fujii, Asakura, Yamazaki "Cell design system for mobile communication"
NTT DoCoMo Technical Journal Vol.
1, 2 No. 4 pp. 28-34 1995-0
1, or Omatsuzawa, Yamashita, “Stationary Design Integrated Support System” NTT DoCoMo Technical Journal
Vol. 4 No. 1 pp. 28-31 1996-
04, etc., describes such techniques in detail. These techniques divide the cell into smaller areas,
Elevation data, terrain data, and communication traffic data are held for each area, and the signal-to-noise power ratio (SIR) at the receiving point and the traffic for each base station are calculated based on the data. In addition, these methods are frequency division multiple access (Freque) multiple access methods.
energy DivisionMultiple Acc
ess; FDMA) and time division multiple access (Time Di)
vision Multiple Access; T
It is used for DMA).

On the other hand, code division multiple access (Code Di)
vision Multiple Access; CD
Regarding MA), the quality of propagation has greatly influenced the propagation conditions in the FDMA and TDMA systems so far, and the communication traffic and its temporal fluctuation have a great influence on the quality. Japanese Unexamined Patent Publication No. 8-191148 “Call Admission Control Method and Device” discloses a method of determining admission of a new call based on prediction of the amount of interference in a base station.
It is explained in detail that the amount of interference is important for quality in the uplink of the system.

International publication number WO98 / 30057
"Call admission control method and mobile station apparatus for CDMA mobile communication system" discloses a method for making a call admission determination in a mobile station by notifying information about an uplink interference amount and downlink transmission power from a base station. It is explained in detail that the total transmission power of the base station is important for quality. CDM is a method for designing an area in consideration of such communication traffic and its temporal variation.
The A system has never been so far.

[0007]

The above-mentioned conventional method has a serious problem that it cannot be applied to a CDMA system as it is because interference from communication performed in the surrounding base stations is not counted as traffic. was there.

Further, even in the FDMA system and the TDMA system, the interference power from the same radio channel used at a geographically distant place actually causes a great deterioration of the quality, but as a traffic, There was a problem that the quality could not be calculated accurately because it was not recorded.

Further, since the downlink total transmission power, which is an important index in the CDMA system, is not considered in the conventional methods, there is a serious problem that it cannot be directly applied to the CDMA system.

Furthermore, the FDMA system and TDMA
In the system, if the configuration is such that the signals sent out using multiple channels are commonly amplified, the total transmission power greatly affects the quality, but there is no calculation method corresponding to this, so there is no quality method. There was a problem that could not be calculated.

In view of the above problems, it is an object of the present invention to provide a method and apparatus for calculating a traffic distribution in a base station in a mobile communication system and accurately and easily calculating quality in the base station. .

[0012]

The invention according to claim 1 includes a plurality of base stations and a plurality of mobile stations communicating with the base stations, and an area in which the mobile stations are distributed is divided into a plurality of areas. In a communication quality calculation method in a divided mobile communication system, a transmission power data storage step of storing transmission power data of at least one of the mobile station and the base station existing in the area, corresponding to each of the areas. A call volume data storage step of storing call volume data of the area; a traffic calculation step of calculating an average value and a variance of applied traffic in the base station; and a communication quality calculation based on the average value and the variance. And a communication quality calculating step.

The invention according to claim 2 is the communication quality calculation method according to claim 1, wherein the traffic calculation step is based on the transmission power data of the mobile station stored by the transmission power data storage step, A first calculation step for calculating received power when the base station receives a signal transmitted by the mobile station; and based on the call quantity data and the received power stored by the call quantity data storing step, It is characterized by comprising a second calculation step for calculating the average value and the variance of the applied traffic at the base station.

According to a third aspect of the present invention, in the communication quality calculation method according to the first aspect, the traffic calculation step includes the transmission power data and the call volume of the base station stored by the transmission power data storage step. It is characterized by comprising a third calculation step for calculating the average value and the variance of the applied traffic at the base station based on the call volume data stored in the data storage step.

[0015] According to a fourth aspect of the invention, in the communication quality calculation process of claim 1, wherein the communication quality calculation step, based on the value of the mean and variance of the applied traffic calculates the distribution of traffic and, pre-SL application traffic and wherein the benzalkonium be operational <br/> a probability of more than a predetermined threshold.

[0016] The invention according to claim 5, in the communication quality calculation method according to claim 4, wherein the threshold is a is <br/> that an interference power or a constant factor thereof is tolerated in the base stations Characterize.

According to a sixth aspect of the present invention, in the communication quality calculation method according to the fourth aspect, the threshold is the interference power allowed in the base station or a constant multiple thereof, and the threshold of the receiver in the base station. It is characterized by being the sum of thermal noise power.

According to a seventh aspect of the present invention, in the communication quality calculation method according to the fourth aspect, the threshold is the interference power allowed in the base station or a constant multiple thereof, and the threshold of the receiver in the base station. It is calculated by the sum of the thermal noise power and the thermal noise power ratio of the receiver.

[0019] The invention according to claim 8, in the communication quality calculation method according to claim 4, wherein the threshold value, characterized in that it is a sum or a constant multiple thereof maximum transmission power of the base station.

The invention described in claim 9 is a computer-readable recording medium in which a program for causing a computer to execute the communication quality calculation method according to any one of claims 1 to 8 is recorded. Is characterized by.

According to a tenth aspect of the present invention, there is provided a mobile communication system comprising a plurality of base stations and a plurality of mobile stations communicating with the base stations, wherein an area in which the mobile stations are distributed is divided into a plurality of areas. In the communication quality calculation device, a transmission power data storage unit that stores transmission power data of at least one of the mobile station and the base station existing in the area, corresponding to each area. , Call volume data storage means for storing call volume data of the area, traffic calculation means for calculating an average value and variance of applied traffic in the base station, and communication quality based on the average value and the variance And a communication quality calculation means.

According to an eleventh aspect of the present invention, in the communication quality calculation apparatus according to the tenth aspect, the traffic calculation means is based on the transmission power data of the mobile station stored by the transmission power data storage means, Based on the call quantity data and the received power stored in the call quantity data storage means, the first calculating means for calculating received power when the base station receives the signal transmitted by the mobile station, and It is characterized by comprising a second calculation means for calculating the average value and the variance of the applied traffic in the base station.

According to a twelfth aspect of the present invention, in the communication quality calculation device according to the tenth aspect, the traffic calculation means is the transmission power data and the call volume of the base station stored by the transmission power data storage means. Based on the call volume data stored by the data storage means,
It is characterized by further comprising a third calculating means for calculating the average value and the variance of the applied traffic in the base station.

The invention described in claim 13 is the invention according to claim 10.
In the communication quality calculation apparatus according to the communication quality calculation means, on the basis of the average value and the variance value of the applied traffic calculates the distribution of traffic, greater than or equal to the threshold before SL applied traffic is predetermined It characterized the Turkey to calculating <br/> the probability of.

The invention according to claim 14 is the invention according to claim 13.
In the communication quality calculation device according to, the threshold is
Interference power allowed at the base station or a multiple of it
Characterized in that there.

The invention according to claim 15 provides the invention according to claim 13.
In the communication quality calculation device according to, the threshold is
It is characterized in that it is the sum of the interference power allowed in the base station or a constant multiple thereof and the thermal noise power of the receiver in the base station.

The invention according to claim 16 provides the invention according to claim 13.
In the communication quality calculation device according to, the threshold is
It is characterized in that it is calculated by the sum of the interference power allowed in the base station or a constant multiple thereof and the thermal noise power of the receiver in the base station, and the ratio of the thermal noise power of the receiver.

The invention according to claim 17 is the same as that according to claim 13.
In the communication quality calculation device according to, the threshold is
It is characterized in that it is the sum of the maximum transmission power of the base station or a constant multiple thereof.

[0029]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described in detail below with reference to the drawings.

FIG. 2 is a block diagram showing an example of the hardware configuration of the quality calculation device according to the embodiment of the present invention. The quality calculation device 200 according to the present embodiment includes a main control unit 202, a storage device 204, an input / output control unit 206, an input device 208, a display device 210, and an output device 212, and may take the form of, for example, a personal computer. it can.

FIG. 3A shows that the cell is divided into a plurality of areas in the present invention. FIG. 3B corresponds to each area, at least one of the transmission powers (Pbi, Pmi) of the mobile station and the base station when the mobile station exists in the area, and Call volume A
i is stored in a storage device such as a fixed disk or a memory. If it is necessary to calculate the reception power at the receiving point based on the stored transmission power, the ground clearance of the antenna of the base station or mobile station, the radio frequency used, the antenna directivity of the base station or mobile station, etc. Is stored in a storage device and the received power at the reception point is calculated using this. To calculate the received power, for example, H.264. Hata
"Empirical Formula for P
ropagation Loss in Land M
mobile Radio Services ”IEEE
E Trans. on Vehic. Techno
l. , Vol. VT-29 No. 3 Aug. 198
The empirical formula for calculating the received power shown in 0 can be used.

FIG. 4 is an example of a flowchart for explaining the operation when the present invention is applied to the uplink. Based on the transmission power of the mobile station held for each area, the reception power Ri when the signal transmitted by the mobile station existing in the i-th area is received by the base station is calculated. The step of calculating the average value and the variance of the applied traffic is to calculate the average value of the applied traffic at the base station with the call volume Ai of the i-th area, C0 being an arbitrary constant, C1 being a non-negative constant, and C2 being a positive constant. , Average value = C0 + Σ {C1 × Ri × Ai} (Equation 1), and the variance of the applied traffic at the base station is calculated as follows: Variance = C2 + Σ {C1 × C1 × Ri × Ri × Ai} ( It is calculated as Equation 2).

Since the distribution is calculated in addition to the average value based on the static data held in each area, the deterioration of the communication quality due to the temporal fluctuation of traffic and the value of the call loss rate are calculated. It becomes possible to do.

More specifically, the variable k for counting base stations is initialized to 1 (step S402). Next, the variable i for counting the area is initialized to 1, and the variables Sm and Sv for calculating the mean and the variance are initialized to 0 (step S404). The reception power at the base station is calculated for each area (step S406). As described above, this calculation uses the ground clearance of the antenna of the base station or mobile station, the radio frequency to be used, the antenna directivity of the base station or mobile station, etc., which are set in advance. For example, it is calculated using the empirical formula for calculating the received power described above. Next, the average Sm and the variance Sv are updated using the calculated received power (step S408). increment i by 1 (step S4
10) If it is less than or equal to the number of areas to be calculated, the same operation is repeated (step S412). If the number of areas to be calculated is exceeded, the process proceeds to the process of calculating quality using the obtained Sm and Sv and a predetermined threshold value (step S414). This calculation can be performed in various ways depending on the quality regulations. For example, when the traffic distribution is approximated by using a normal distribution, the quality P can be calculated by the following formula using the error complementary function Erfc (').

[0035]

Here, T is a threshold value, and the following values can be set, for example. First, the number of interference powers allowed in the base station or a constant multiple thereof. Secondly, the sum of interference power allowed in the base station or a constant multiple thereof and the thermal noise power of the base station receiver. Thirdly, the sum I of the interference power allowed in the base station or a constant multiple thereof and the thermal noise power of the base station receiver, and the ratio η between the thermal noise power N of the base station receiver and an arbitrary positive value. C calculated by the constant C
(1-1 / η) or the like. To increase the calculation to the next base station, k is incremented by 1 (step S416). If the number is less than or equal to the number of base stations to be calculated, the same operation is repeated for the next base station (step S418). If it exceeds the calculation target base station, the process ends. In this flowchart, the constants C0 and C2 are assumed to be zero,
These may be arbitrary constants.

FIG. 5 is an example of a flowchart for explaining the operation when the present invention is applied to the downlink. As the transmission power Pi at the base station, the average value of the applied traffic at the base station is set as the average value = C0 + Σ {C1 × Pi × Ai} (Equation 4), and the variance of the applied traffic at the base station is variance = C2 + Σ {C1 × C1 × Pi × Pi × Ai} (Equation 5)

Since the distribution is calculated in addition to the average value based on the static data held in each area, the deterioration of the communication quality due to the temporal fluctuation of traffic and the value of the call loss rate are calculated. It becomes possible to do.

More specifically, a variable k for counting base stations is initialized to 1 (step S502). Next, the variable i for counting the areas is initialized to 1, and the variables Sm and Sv for calculating the mean and the variance are initialized to 0 (step S504). Next, Sm and Sv are updated using the transmission power value recorded for each area (step S506). If i is increased by 1 (step S508) and is equal to or smaller than the number of areas to be calculated, the same operation is repeated (step S510). If the number of calculated areas is exceeded,
The process proceeds to a process of calculating quality using the obtained Sm and Sv and a predetermined threshold value (step S51).
2). This calculation can be performed in various ways depending on the quality regulations. For example, when the traffic distribution is approximated by using a normal distribution, the quality P is the error complementary function Erf.
It can be calculated by the following formula using c (').

[0040]

Here, T is a threshold value, and the threshold value can be the total maximum transmission power of the base station or a constant multiple thereof. 1 for k to move calculation to the next base station
Increase (step S514). If the number is less than or equal to the number of base stations to be calculated, the same operation is repeated for the next base station (step S516). If it exceeds the calculation target base station, the process ends. In this flowchart, the constants C0 and C2 are assumed to be zero, but they may be arbitrary constants.

FIG. 6 is a block diagram showing an example of a hardware configuration of an uplink quality calculation device 600 to which the present invention is applied. The area data holding unit 602 holds the data of the transmission power Pi and the call volume Ai for each area. The propagation specification data holding unit 604 is used for calculation of received power,
The antenna height of the base station and the mobile station, the radio frequency, or the antenna directivity of the base station and the mobile station are held. The reception power calculation unit 606 includes the area data holding unit 6
02 and necessary data is read from the propagation specification data holding unit 604, and the reception power is calculated. The traffic calculation unit 608 calculates the average Sm and variance Sv of the traffic at the base station from the reception power Ri and call volume Ai data for each area calculated by the reception power calculation unit 606. The quality calculation unit 610 uses the average Sm and variance Sv calculated by the traffic calculation unit 608 and the threshold value T provided by the threshold value generation unit 612 to determine quality such as the call loss rate and the probability of deterioration of communication quality. Calculate and output. Average Sm calculated by traffic calculation unit 608
The process of calculating the quality by using the variance Sv and the predetermined threshold T can be performed by various methods. For example, when the traffic distribution is approximated by using a normal distribution, the quality P is the error complementary function Erfc ('
) Can be used to calculate by the following formula.

[0043]

Here, T is a threshold value, and the following values can be set, for example. First, the number of interference powers allowed in the base station or a constant multiple thereof. Secondly, the sum of interference power allowed in the base station or a constant multiple thereof and the thermal noise power of the base station receiver. Thirdly, the sum I of the interference power allowed in the base station or a constant multiple thereof and the thermal noise power of the base station receiver, and the ratio η between the thermal noise power N of the base station receiver and an arbitrary positive value. C calculated by the constant C
(1-1 / η) or the like.

FIG. 7 is a block diagram showing an example of the hardware configuration of a downlink quality calculation apparatus 700 to which the present invention is applied. The area data holding unit 702 holds the data of the transmission power Pi and the call volume Ai for each area. The traffic calculation unit 704 calculates the average Sm and variance Sv of the traffic at the base station from the transmission power Pi and the call volume Ai data. The quality calculation unit 706 uses the average Sm and the variance Sv calculated by the traffic calculation unit 704 and the threshold value T provided by the threshold value generation unit 708 to determine the quality such as the call loss rate and the probability of deterioration of communication quality. Calculate and output. The process of calculating the quality using the obtained average Sm and variance Sv and the predetermined threshold value T can be executed by various methods. For example, when the traffic distribution is approximated by using a normal distribution, the quality P can be calculated by the following equation using the complementary error function Erfc (').

[0046]

Here, T is a threshold, and the threshold can be the total maximum transmission power of the base station or a constant multiple thereof.

[0048]

As described in detail above, according to the present invention, transmission for storing transmission power data of base stations corresponding to a plurality of areas in which mobile stations are distributed and / or mobile stations located in areas are stored. Power data storage step, call volume data storage step to store area call volume data, traffic calculation step to calculate average value and variance of applied traffic at the base station, and communication quality calculation based on average value and variance By including the communication quality calculation step to
It is possible to calculate the communication quality with high accuracy and easily.

Further, according to the present invention, the reception when the traffic calculation step receives the signal transmitted by the mobile station at the base station based on the transmission power data of the mobile station stored in the transmission power data storage step. A first calculation step of calculating power, and a second calculation step of calculating an average value and a variance of applied traffic at the base station based on the call quantity data and the received power stored in the call quantity data storing step. In order to record the interference traffic from the communication performed by the base station in other areas, and also to record the interference power from the same radio channel used in other areas as the traffic, It becomes possible to calculate the quality with high accuracy and easily.

Further, according to the present invention, the traffic calculation step is based on the transmission power data of the base station stored in the transmission power data storage step and the call volume data stored in the call volume data storage step. By including the third calculation step of calculating the average value and the variance of the applied traffic in, the total transmission power of the downlink is also taken into consideration, and the calculation method corresponding to this makes it possible to accurately and easily improve the communication quality in the base station. It becomes possible to calculate.

Further, according to the present invention, the communication quality calculating step calculates the probability distribution based on the average value and the variance value of the applied traffic, and the applied traffic has a predetermined threshold value. By including a probability determination step of calculating the above probability,
It is possible to calculate the communication quality with high accuracy and easily.

Furthermore, according to the present invention, the probability determining step includes the step of setting the interference power allowed in the base station or a constant multiple thereof as a threshold value, whereby the communication quality is calculated with high accuracy. It becomes possible.

Further, according to the present invention, the probability determining step sets the sum of the interference power allowed in the base station or a constant multiple thereof and the thermal noise power of the receiver in the base station as a threshold value. By providing
It is possible to calculate the communication quality with high accuracy.

Further, according to the present invention, the probability determining step includes the interference power allowed in the base station or a constant multiple thereof and the sum of the thermal noise power of the receiver in the base station and the thermal noise power of the receiver. It is possible to calculate the communication quality with high accuracy by including a threshold value calculation step for performing calculation based on the ratio of the above and a step for setting the calculation result of the threshold value calculation step as a threshold value. .

Furthermore, according to the present invention, the probability determining step includes a step of setting the sum of the maximum transmission power of the base station or a constant multiple thereof as a threshold, so that the communication quality is calculated with high accuracy. It becomes possible.

[Brief description of drawings]

FIG. 1 is a diagram schematically showing a mobile communication system in a conventional technique.

FIG. 2 is a block diagram showing an example of a configuration of a quality calculation device of a mobile communication system in the embodiment of the present invention.

FIG. 3 is a diagram showing an example of a relationship between an area divided into a plurality of areas and a record on a storage device corresponding to the areas in the embodiment of the present invention.

FIG. 4 is a flowchart showing an example of an operation when the present invention is applied to an uplink.

FIG. 5 is a diagram showing a flowchart illustrating an example of an operation when the present invention is applied to a downlink.

FIG. 6 is a block diagram showing an example of a configuration of an uplink quality calculation device to which the present invention is applied.

FIG. 7 is a block diagram showing an example of a configuration of a downlink quality calculation apparatus to which the present invention is applied.

[Explanation of symbols]

102 base station 104 mobile station 106 cells 200 quality calculator 202 Main control unit 204 storage device 206 I / O controller 208 Input device 210 display device 212 Output device 600 quality calculator 602 Area data storage 604 Received power calculator 606 Propagation data storage 608 Traffic calculation part 610 Quality calculator 612 Threshold generator 700 quality calculator 702 Area data storage 704 Traffic calculation unit 706 Quality calculator 708 Threshold generator

Claims (17)

(57) [Claims] 1. A includes a plurality of mobile stations communicating with a plurality of base stations and base station, the communication quality calculation method in a mobile communication system obtained by dividing the area in which the mobile station is distributed to a plurality of zones, each A transmission power data storing step of storing transmission power data of at least one of the mobile station and the base station existing in the area corresponding to the area, and a call volume storing call volume data of the area A data storage step, a traffic calculation step for calculating an average value and a variance of applied traffic at the base station, and a communication quality calculation step for calculating a communication quality based on the average value and the variance. Communication quality calculation method. 2. The communication quality calculation method according to claim 1, wherein the traffic calculation step includes a signal transmitted by the mobile station based on the transmission power data of the mobile station stored by the transmission power data storage step. A first calculation step of calculating reception power when the base station receives the call quantity; and an average of applied traffic in the base station based on the call quantity data and the reception power stored in the call quantity data storing step. A communication quality calculation method comprising: a second calculation step of calculating a value and a variance. 3. The communication quality calculation method according to claim 1, wherein the traffic calculation step is stored by the transmission power data of the base station stored by the transmission power data storage step and the call amount data storage step. Based on the call volume data,
A communication quality calculation method comprising a third calculation step of calculating an average value and a variance of applied traffic in the base station. 4. A communication quality calculation method according to claim 1, wherein the communication quality calculation step, based on the value of the mean and variance of the applied traffic calculates the distribution of traffic
And communication quality calculation method before SL applied traffic is characterized and Turkey to calculating a probability of more than a predetermined threshold. 5. A communication quality calculation method according to claim 4, wherein the threshold value, the communication quality calculation method which is a interference power or a constant factor thereof is tolerated in the base stations. 6. The communication quality calculation method according to claim 4, wherein the threshold is a sum of interference power allowed in a base station or a constant multiple thereof and thermal noise power of a receiver in the base station. the communication quality calculation method which is characterized in that. 7. The communication quality calculation method according to claim 4, wherein the threshold is a sum of interference power allowed in a base station or a constant multiple thereof and thermal noise power of a receiver in the base station. , The ratio of the thermal noise power of the receiver and
Communication quality calculation method characterized by that. 8. The communication quality calculation method according to claim 4, wherein the threshold value, the communication quality calculation method which is a sum or a constant multiple thereof maximum transmission power of the base station. 9. claims 1 to computer readable recording medium recording a program for executing the communication quality calculation process according to a computer in any one of 8. Communicates with 10. plurality of base stations and base station and a plurality of mobile stations, in the communication quality calculation apparatus in a mobile communication system obtained by dividing the area in which the mobile station is distributed to a plurality of zones, each in response to the area of traffic intensity for storing transmission power data storing means for storing one of transmission power data of the mobile station and the base stations located at least in the zone, the traffic intensity data of the area Data storage means, traffic calculation means for calculating an average value and variance of applied traffic at the base station, and communication quality calculation means for calculating communication quality based on the average value and the variance. Communication quality calculator. 11. The communication quality calculation device according to claim 10, wherein the traffic calculation means is a signal transmitted by the mobile station based on the transmission power data of the mobile station stored by the transmission power data storage means. An average of applied traffic in the base station based on the call quantity data and the received power stored by the call quantity data storage means, the first calculating means calculating a received power when the base station receives A communication quality calculation device comprising: a second calculation means for calculating a value and a variance. 12. The communication quality calculation device according to claim 10, wherein the traffic calculation means is stored by the transmission power data of the base station stored by the transmission power data storage means and the call quantity data storage means. A communication quality calculating device comprising: a third calculating means for calculating an average value and a variance of applied traffic in the base station based on the call volume data. 13. The communication quality calculation apparatus according to claim 10, wherein the communication quality calculating means, based on the values of the mean and variance of the applied traffic calculates the distribution of the traffic, pre <br/> communication quality calculation device whose serial application traffic is characterized and Turkey to calculating a probability of more than a predetermined threshold. In the communication quality calculation apparatus according to claim 13, wherein the threshold value, the communication quality calculation unit, characterized in that an interference power or a constant multiple thereof is tolerated in the base stations. 15. The communication quality calculation device according to claim 13, wherein the threshold is a sum of interference power allowed in a base station or a constant multiple thereof and thermal noise power of a receiver in the base station. communication quality calculation apparatus characterized by some. 16. The communication quality calculation device according to claim 13, wherein the threshold is a sum of interference power allowed in a base station or a constant multiple thereof and thermal noise power of a receiver in the base station. , The ratio of the thermal noise power of the receiver and
Communication quality calculation apparatus characterized by that. In the communication quality calculation apparatus according to claim 17 claim 13, wherein the threshold value, the communication quality calculation unit which is a sum or a constant multiple thereof maximum transmission power of the base station.