JP2006005422A - Mobile communication system, wireless base station, mobile communication method, and mobile communication program - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a technology of revising a transmission rate by taking into account the number of simultaneously connected wireless terminals U with respect to a line capacity M. <P>SOLUTION: A mobile communication system disclosed herein is configured to comprise: wireless terminals 30; BTSes 20 connected to the wireless terminals 30; and an RNC 10 connected to the BTSes 20 via communication lines 40. The RNC 10 determines a maximum transmission rate P of each of simultaneously connected wireless terminals on the basis of the line capacity M of the communication lines 40 and the number U of the simultaneously connected wireless terminals among the wireless terminals 30 connected simultaneously to the BTSes 20. The RNC 10 includes a transmission rate setting section 11 for setting the maximum transmission rate P, and each BTS 20 includes: a line capacity identification section 24 for identifying the line capacity M; the number of simultaneously connected wireless terminals management section 25 for managing the number U of the simultaneously connected wireless terminals; a transmission rate determining section 26 for determining the maximum transmission rate P; a reception buffer 27 for storing data received via the communication lines 40; and a reception buffer control section 28 for obtaining a transmission rate from the RNC 10 on the basis of the data storage rate of the reception buffer 27. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a mobile communication system, a radio base station, a mobile communication method, and a mobile communication program for changing a transmission rate, and in particular, considers the number of simultaneously connected radio terminals with respect to line capacity and the data accumulation rate in a reception buffer. The present invention relates to a mobile communication system, a radio base station, a mobile communication method, and a mobile communication program to be changed.

  As a conventional technology example related to the transmission rate change, there is a method of performing wireless communication at a transmission rate that satisfies a desired communication quality in accordance with a propagation path loss in consideration of the line capacity of the entire service area (see, for example, Patent Document 1). ).

JP 2001-44930 A (paragraph 0038, FIG. 3)

  In the above conventional technique, the transmission rate is determined based on a comparison table of transmission power value, SIR (desired wave-to-interference wave power ratio) and transmission rate value. However, the number of mobile stations that perform wireless communication with the base station is not considered at all, and it is difficult to set a high-speed transmission rate.

  An exchange of a W-CDMA (Wide-Band Code Division Multiple Access) system that is a subject of the present invention is required to transmit and receive data at a higher speed than other exchange systems. Therefore, it is necessary to set a large number of transmission rates from high speed to low speed for the wireless terminals connected simultaneously, and the frequency of changing the transmission rate is various. The present invention has been made in view of such circumstances, and an object of the present invention is to change the transmission rate in consideration of simultaneous connection in a wireless terminal.

  A mobile communication system according to the present invention is a mobile communication system including a wireless terminal, a second system connected to the wireless terminal, and a first system connected to the second system via a communication line, The maximum transmission rate for each simultaneously connected wireless terminal is determined based on the number of simultaneously connected wireless terminals simultaneously connected to the second system among the wireless terminals and the line capacity of the communication line.

  The mobile communication system according to the present invention determines the maximum transmission rate such that a product of the maximum transmission rate and the number of the simultaneously connected wireless terminals is less than a product of the line capacity and a predetermined value. It is characterized by.

  The mobile communication system according to the present invention is characterized in that the maximum transmission rate is changed according to a change in the number of the simultaneously connected wireless terminals.

  The mobile communication system according to the present invention is characterized in that the maximum transmission rate is reduced when the number of the simultaneously connected wireless terminals increases.

  In the mobile communication system according to the present invention, the first system includes transmission rate setting means for setting the maximum transmission rate, and the second system includes line capacity identifying means for identifying a line capacity of the communication line, Simultaneously connected wireless terminal number managing means for managing the number of simultaneously connected wireless terminals, transmission rate determining means for determining the maximum transmission rate, receiving buffer means for storing data received via the communication line, and the receiving Receiving buffer control means for obtaining a transmission rate from the first system based on the data storage rate of the buffer means.

  The mobile communication system according to the present invention is characterized in that the first system is a radio network controller and the second system is a radio base station.

  A radio base station according to the present invention is a radio base station that is connected to a radio terminal and connected to a radio network control device via a communication line, the line capacity identifying means for identifying the line capacity of the communication line, Among wireless terminals, simultaneous connection wireless terminal number management means for managing the number of simultaneously connected wireless terminals that are simultaneously connected to the wireless base station, and transmission rate determination means for determining the maximum transmission rate for each simultaneously connected wireless terminal; Receiving buffer means for storing data received via the communication line; and receiving buffer control means for obtaining a transmission rate from the radio network controller based on a data storage rate of the receiving buffer means. Features.

  The radio base station according to the present invention is characterized in that the transmission rate determining means determines a maximum transmission rate for each of the simultaneously connected wireless terminals based on a line capacity of the communication line and a quantity of the simultaneously connected wireless terminals. .

  The radio base station according to the present invention is such that, in the transmission rate determining means, the product of the maximum transmission rate and the number of the simultaneously connected radio terminals is less than the product of the line capacity and a predetermined value. The maximum transmission rate is determined.

  The radio base station according to the present invention is characterized in that the transmission rate determining means changes the maximum transmission rate in accordance with a change in the number of the simultaneously connected radio terminals.

  The radio base station according to the present invention is characterized in that the transmission rate determining means reduces the maximum transmission rate when the number of the simultaneously connected radio terminals increases.

  The radio base station according to the present invention is characterized in that a transmission rate is obtained so that an appropriate amount of data is stored in the reception buffer means, and the obtained transmission rate is notified to the radio network controller.

  A mobile communication method according to the present invention is a mobile communication method of a mobile communication system comprising a radio terminal, a second system connected to the radio terminal, and a first system connected to the second system via a communication line. And the second system is configured to determine the number of the simultaneously connected wireless terminals based on the number of simultaneously connected wireless terminals that are simultaneously connected to the second system among the wireless terminals and the line capacity of the communication line. A maximum transmission rate is determined, data transmission at the determined maximum transmission rate is requested to the first system, and the first system transmits data at the requested maximum transmission rate.

  A mobile communication method according to the present invention is a mobile communication method of a mobile communication system comprising a radio terminal, a second system connected to the radio terminal, and a first system connected to the second system via a communication line. And identifying the line capacity of the communication line and confirming the number of simultaneously connected wireless terminals simultaneously connected to the second system among the wireless terminals, and the line capacity and the simultaneously connected wireless terminals Determining a maximum transmission rate from the first system to the second system based on the quantity; requesting data transmission at the maximum transmission rate from the second system to the first system; In the first system, setting the requested maximum transmission rate and transmitting data from the first system to the second system; Characterized in that it contains.

  The mobile communication method according to the present invention includes a step of determining whether or not a data accumulation rate in the reception buffer of the second system exceeds an upper limit threshold, and if the data accumulation rate exceeds the upper limit threshold, the data accumulation rate is Determining a transmission rate to be reduced; requesting data transmission at the determined transmission rate from the second system to the first system; and setting the requested transmission rate in the first system; Transmitting data from the first system to the second system.

  In the mobile communication method according to the present invention, the maximum transmission rate is determined so that a product of the maximum transmission rate and the number of the simultaneously connected wireless terminals is less than a product of the line capacity and a predetermined value. It is characterized by.

  The mobile communication method according to the present invention is characterized in that the first system is a radio network controller and the second system is a radio base station.

  The mobile communication program according to the present invention connects a wireless base station computer that is connected to a wireless terminal and receives data from a wireless network control device via a communication line at a predetermined transmission rate, and the communication line capacity and the wireless The maximum transmission rate that maximizes the transmission rate is determined based on the function of confirming the number of simultaneously connected wireless terminals that are simultaneously connected to the wireless base station among the terminals, the line capacity, and the number of simultaneously connected wireless terminals. And a function for requesting the wireless network control device to transmit data at the maximum transmission rate.

  The mobile communication program according to the present invention further includes a function for determining whether or not a data accumulation rate in a reception buffer included in the radio base station exceeds an upper threshold, and when the data accumulation rate exceeds the upper threshold, the data It is characterized in that a function for obtaining a transmission rate for reducing the accumulation rate is realized.

  The mobile communication program according to the present invention determines the maximum transmission rate such that a product of the maximum transmission rate and the number of the simultaneously connected wireless terminals is less than a product of the line capacity and a predetermined value. It is characterized by.

  In the BTS (wireless base station), the maximum transmission rate P is determined based on the number U of simultaneously connected wireless terminals U and the line capacity M, and data transmission is performed at the determined maximum transmission rate P. Therefore, data transfer control is performed efficiently. There is an effect that becomes possible.

  Further, since the transmission rate is changed in consideration of the upper limit threshold and the lower limit threshold of the data accumulation rate of the reception buffer in the BTS, there is an effect that data can be transferred efficiently and an appropriate amount of data can be accumulated.

  The present invention relates to a transmission rate of data transmitted between an RNC (Radio Network Control Device), which is an exchange of a W-CDMA system, and a BTS (Radio Base Station). In data transmission between the RNC 10 serving as the transmission side system and the BTS 20 serving as the reception side system, it has a function of determining the maximum transmission rate (per wireless terminal) that can be transmitted based on the line capacity and the number of simultaneously connected wireless terminals. An example of this is transmission control of an exchange system that performs data transfer at a variable transmission rate. Of the wireless terminals 31, 32,... 3N under the control of the BTS 20, the wireless terminal 30 that is actually performing voice communication or packet communication simultaneously is called a simultaneous connection wireless terminal. Called the number of simultaneously connected wireless terminals.

  Specifically, when data reception is possible in the reception side system, “data transmission using the maximum transmission rate P” that is permitted to be received from the reception side system is requested to the transmission side system. The transmission side system that has received the request sets a maximum transmission rate P that matches the request, and transmits data to the reception side system using the set maximum transmission rate P. Accordingly, data reception failures can be reduced in the receiving system.

  Also, if the data storage rate, which is the amount of data stored in the reception buffer, exceeds the upper threshold in the receiving system, data transmission at a lower speed is sent to the transmitting system until the data storage rate reaches the lower threshold. Has the required function. Therefore, the data accumulation amount is held at an appropriate value.

  Next, the best mode for carrying out the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a configuration diagram of a mobile communication system according to an embodiment of the present invention.

  The mobile communication system includes an RNC (Radio Network Controller) 10, BTSs (Radio Base Stations) 20 and 20a, and radio terminals 31, 32... 3N, 31a, 32a. , 20a are formed with communication lines 40, 40a, respectively. In the following description, each or all of the wireless terminals 31, 32... 3N, 31a, 32a. The RNC 10 is a transmission side system (first system), and the BTSs 20 and 20a are reception side systems (second system). Hereinafter, the RNC 10, the BTS 20, the wireless terminals 31, 32... 3N, and the communication line 40 will be described.

  The RNC 10 includes a transmission rate setting unit 11, which receives a request from the BTS 20 and sets the maximum transmission rate P or the transmission rate. The RNC 10 transmits data to the BTS 20 at the set maximum transmission rate P or transmission rate.

  The BTS 20 includes a radio unit 21, a control unit 22, a communication line interface unit 23, a line capacity identification unit 24, a simultaneous connection radio terminal number management unit 25, a transmission rate determination unit 26, a reception buffer 27, and a reception buffer control unit 28. Yes.

  The wireless unit 21 has a function of performing wireless communication with the wireless terminals 31, 32... 3N, and the control unit 22 performs signal processing / control inside the BTS 20 and control of signals outside the BTS 20. The communication line interface unit 23 takes an interface with the communication line 40.

  The line capacity identifying unit 24 identifies the line capacity M of the communication line 40. The simultaneous connection wireless terminal number management unit 25 manages simultaneously connected wireless terminals that are simultaneously connected to the BTS 20 among the wireless terminals 31, 32,... 3N under the control of the BTS 20. This management includes detecting a change in simultaneously connected wireless terminals and grasping the number of simultaneously connected wireless terminals (number of simultaneously connected wireless terminals U).

  The transmission rate determination unit 26 includes a maximum transmission rate determination algorithm that determines the transmission rate between the RNC 10 and the BTS 20. Based on the line capacity M, the number U of simultaneously connected wireless terminals, and the predetermined value k, the maximum transmission rate P is determined using this maximum transmission rate determination algorithm. This maximum transmission rate determination algorithm is stored in the recording medium of the transmission rate determination unit 26. The reception buffer 27 is a buffer provided to compensate for a difference in processing speed inside the BTS 20 and a transfer speed from the BTS 20 to the wireless terminals 31, 32... 3N, and an upper limit threshold and a lower limit threshold are set. . The upper threshold indicates a threshold that limits the accumulation of data due to an excessive amount of accumulated data. The lower limit threshold indicates a threshold value that promotes data accumulation when the amount of accumulated data becomes excessive.

  The reception buffer control unit 28 determines whether or not the data accumulation amount of the reception buffer 27 has exceeded the upper limit threshold value, and obtains a transmission rate at which an appropriate amount of data is accumulated. Further, it is determined whether or not the lower limit threshold is exceeded, and the control unit 22 is notified.

  Next, the operation of the best mode for carrying out the present invention will be described with reference to the drawings.

  FIG. 2 is a transmission rate change sequence according to the embodiment of the present invention.

  The BTS 20 shifts to a state where data can be received (S101), confirms the line capacity M of the communication line 40, and confirms the number U of simultaneously connected wireless terminals at that time (S102). Next, the maximum transmission rate P is determined using the maximum transmission rate determination algorithm (S103). From the BTS 20 to the RNC 10, data transmission is requested at the maximum transmission rate P for each simultaneously connected wireless terminal among the wireless terminals 31, 32,... 3N (S104).

  Data transmission rate information is added to the notification of data transmission requested from the BTS 20 to the RNC 10. The RNC 10 refers to the transmission rate information, sets the maximum transmission rate P for each simultaneously connected wireless terminal in the transmission rate setting unit 11, and transmits data to the BTS 20 (S105).

  As the number U of simultaneously connected wireless terminals increases (YES in S106), the ratio of the product of the transmission rate to the line capacity M and the number U of simultaneously connected wireless terminals increases. Accordingly, the BTS 20 considers the control for limiting the maximum transmission rate P per simultaneously connected wireless terminal, and makes a request to the RNC 10. If the number U of simultaneously connected wireless terminals decreases (changes), the maximum transmission rate P itself may be reviewed by the maximum transmission rate determination algorithm to increase (accelerate) the maximum transmission rate P.

  If there is no increase (fluctuation) in the number U of simultaneously connected wireless terminals (NO in S106) and the data storage rate of the reception buffer 27 exceeds the upper threshold (YES in S107), the data storage rate decreases to the lower threshold of the data storage rate. Such a transmission rate is obtained (S108). The BTS 20 requests the RNC 10 to transmit data at the determined transmission rate (S109). The RNC 10 transmits data to the BTS 20 at the requested transmission rate (S110). Thereafter, if the data storage rate of the reception buffer 27 falls below the lower limit threshold (YES in S111), the process returns to S102, and the maximum transmission rate P is determined.

  FIG. 3 is an example of a maximum transmission rate determination algorithm for determining the maximum transmission rate P from the line capacity M and the number U of simultaneously connected wireless terminals in the BTS 20. In the maximum transmission rate determination algorithm, transmission is possible even if the product of the maximum transmission rate P and the number U of simultaneously connected wireless terminals (hereinafter referred to as P × U as appropriate) exceeds the line capacity M. This is based on the fact that the transmission rate of the simultaneously connected wireless terminal 30 is not always considered to be the maximum transmission rate P. As an example of this, k (predetermined value) is a positive number, and P × U allows a line capacity (M × 2) less than twice the line capacity M (k = 2).

  Therefore, the maximum transmission rate P is determined by an inequality represented by P × U <M × k. Further, when the number U of simultaneously connected wireless terminals increases, the maximum transmission rate P is appropriately reduced according to an inequality expressed by M × (k + n−1) ≦ P × U <M × (k + n). Here, n is a positive integer (n = 1, 2, 3,...). When the predetermined value k = 2 and n = 1, the value is reduced by 20%, and when n = 2 or more, the value is further reduced by 10%. In other words, the maximum transmission rate P is changed according to the increase (fluctuation) of the number U of simultaneously connected wireless terminals.

  In FIG. 3, 2 is set as the predetermined value k, but it may be any positive number other than 2, and may not be an integer.

  FIG. 4 is an explanatory diagram of the flow of the reception buffer 27 in the BTS 20 according to the present invention. The BTS 20 includes a reception buffer 27 that accumulates data until data received from the RNC 10 is transmitted to the wireless terminals 31, 32,... 3N. For example, as shown in FIG. 4, when the data accumulation rate exceeds the upper limit threshold (90% in FIG. 4), the flow control (transmission rate change) is notified to the RNC 10. When the data storage rate of the reception buffer 27 falls below the lower threshold (80% in FIG. 4), the maximum transmission rate P is determined in consideration of the line capacity M and the number U of simultaneously connected wireless terminals, and notified to the RNC 10 I do. That is, if the upper limit threshold of the data accumulation rate is exceeded, the transmission rate (not the maximum transmission rate P) is changed, and data is transmitted from the RNC 10 to the BTS 20 at the changed transmission rate. When the data storage rate falls below the lower limit threshold, data is transmitted from the RNC 10 to the BTS 20 at the maximum transmission rate P determined by the maximum transmission rate determination algorithm. Note that the upper threshold and the lower threshold are not limited to 90% and 80%, respectively.

  FIG. 5 shows a W-CDMA system configuration when the transmission rate is changed in the W-CDMA system. FIG. 6 is an explanatory diagram of changing the transmission rate for each of cases 1 to 3 in FIG. Hereinafter, cases 1 to 3 will be described with reference to FIGS.

  In case 1 (M = 50 Mbps, U = 5) in FIG. 5, data transmission is requested to the RNC 10 after the BTS 20 is activated. The line capacity M of the communication line 40 is 50 Mbps, and among the wireless terminals 30, the maximum receiving capacity (that corresponds to the maximum transmission rate P) of each of the simultaneously connected wireless terminals connected to the BTS 20 at the same time is set. , 15 Mbps.

  In this case, as shown in FIG. 6, the line capacity M and the number of simultaneously connected wireless terminals U are confirmed (M = 50 Mbps, U = 5), and the maximum transmission rate P (= 15 Mbps) is determined from the maximum transmission rate determination algorithm. A transmission request is made to the RNC 10.

  Case 2 in FIG. 5 (M = 50 Mbps, U = 15) is an example of the maximum transmission rate change in the case where the number U of simultaneously connected wireless terminals of the wireless terminal 30 increases from that in Case 1. In this case, as shown in FIG. 6, the line capacity M and the number of simultaneously connected wireless terminals U are confirmed, and the maximum transmission rate (maximum transmission rate per simultaneously connected wireless terminal) is obtained by subtracting the transmission rate from the maximum transmission rate determination algorithm as compared with case 1. 9 Mbps is assigned), and the RNC 10 is requested to change the maximum transmission rate.

  In case 3 (M = 50 Mbps, U = 15) in FIG. 5, transmission data to the wireless terminals 30 connected simultaneously increases under the same conditions as in case 2, and the upper limit threshold of the reception buffer 27 is exceeded. This is an example of changing the maximum transmission rate. In this case, control is performed to lower the transmission rate so that the data accumulation rate decreases to the lower limit threshold. Here, as an example, the transmission rate is set to 900 kbps, which is 1/10 of Case 2.

  In the cases 1 to 3 described above, the case 1 corresponds to S101 to S105 in FIG. 2, the case 2 corresponds to S106 and S103 to S105 in FIG. 2, and the case 3 corresponds to S107 to S110 in FIG. .

  As described above, since the maximum transmission rate P is allocated to the simultaneously connected wireless terminals among the wireless terminals 31, 32,..., 3N among the wireless terminals 31, 32. Control to perform transfer is possible. Furthermore, by using transmission control in consideration of the data accumulation rate in the reception buffer 27, it is possible to control data transfer to the wireless terminals 31, 32... 3N more efficiently.

  Each processing described above includes the transmission rate setting unit 11, the radio unit 21, the control unit 22, the communication line interface unit 23, the line capacity identification unit 24, the simultaneous connection wireless terminal number management unit 25, the transmission rate determination unit 26, You may perform by the program stored in the computer which the reception buffer 27 and the reception buffer control part 28 have. The program may be stored in a recording medium such as an optical recording medium, a magnetic recording medium, a magneto-optical recording medium, or a semiconductor, and loaded from these recording media. The program may be loaded from an external device (not shown) connected to the BTS 20 via a predetermined network (not shown).

1 is a configuration diagram of a mobile communication system according to the present invention. It is a transmission rate change sequence which concerns on this invention. It is a maximum transmission rate determination algorithm. It is explanatory drawing of the flow of a reception buffer. It is a block diagram of a W-CDMA system. It is explanatory drawing of the transmission rate change for every case.

Explanation of symbols

10 RNC
11 Transmission rate setting unit 20 BTS
DESCRIPTION OF SYMBOLS 21 Radio | wireless part 22 Control part 23 Communication line interface part 24 Line capacity identification part 25 Simultaneously connected radio | wireless terminal number management part 26 Transmission rate determination part 27 Reception buffer 28 Reception buffer control part 30, 31, 32, 3N, 31a, 32a, 3Na Wireless terminal

Claims (20)

A mobile communication system comprising a wireless terminal, a second system connected to the wireless terminal, and a first system connected to the second system via a communication line,
A maximum transmission rate for each simultaneously connected wireless terminal is determined based on the number of simultaneously connected wireless terminals that are simultaneously connected to the second system among the wireless terminals and the line capacity of the communication line. Communications system. 2. The maximum transmission rate is determined such that a product of the maximum transmission rate and the number of simultaneously connected wireless terminals is less than a product of the line capacity and a predetermined value. The mobile communication system described. The mobile communication system according to claim 1, wherein the maximum transmission rate is changed according to a change in a quantity of the simultaneously connected wireless terminals. The mobile communication system according to claim 1, wherein the maximum transmission rate is reduced when the number of the simultaneously connected wireless terminals increases. The first system comprises:
Including transmission rate setting means for setting the maximum transmission rate,
The second system comprises:
Line capacity identifying means for identifying the line capacity of the communication line;
Simultaneously connected wireless terminal number management means for managing the number of simultaneously connected wireless terminals;
Transmission rate determining means for determining the maximum transmission rate;
Receiving buffer means for storing data received via the communication line;
2. The mobile communication system according to claim 1, further comprising: a reception buffer control unit that obtains a transmission rate from the first system based on a data storage rate of the reception buffer unit. The mobile communication system according to any one of claims 1 to 5, wherein the first system is a radio network controller and the second system is a radio base station. A wireless base station that connects to a wireless terminal and connects to a wireless network control device via a communication line,
Line capacity identifying means for identifying the line capacity of the communication line;
Among the wireless terminals, simultaneous connection wireless terminal number management means for managing the number of simultaneously connected wireless terminals that are simultaneously connected to the wireless base station,
Transmission rate determining means for determining a maximum transmission rate for each of the simultaneously connected wireless terminals;
Receiving buffer means for storing data received via the communication line;
And a reception buffer control means for obtaining a transmission rate from the wireless network control device based on a data storage rate of the reception buffer means. The transmission rate determining means is
8. The radio base station according to claim 7, wherein a maximum transmission rate for each of the simultaneously connected wireless terminals is determined based on a line capacity of the communication line and a quantity of the simultaneously connected wireless terminals. In the transmission rate determining means,
8. The maximum transmission rate is determined so that a product of the maximum transmission rate and the number of simultaneously connected wireless terminals is less than a product of the line capacity and a predetermined value. The radio base station described. The transmission rate determining means is
The radio base station according to claim 7, wherein the maximum transmission rate is changed in accordance with a change in the number of the simultaneously connected radio terminals. In the transmission rate determining means,
The radio base station according to claim 7, wherein the maximum transmission rate is reduced when the number of the simultaneously connected radio terminals increases. Obtaining a transmission rate so that an appropriate amount of data is accumulated in the reception buffer means;
The radio base station according to claim 7, wherein the determined transmission rate is notified to the radio network control device. A mobile communication method for a mobile communication system, comprising: a wireless terminal; a second system connected to the wireless terminal; and a first system connected to the second system via a communication line,
The second system comprises:
Based on the number of simultaneously connected wireless terminals that are simultaneously connected to the second system among the wireless terminals and the line capacity of the communication line, the maximum transmission rate for each simultaneously connected wireless terminal is determined, and the determined Requesting the first system to transmit data at the maximum transmission rate;
The first system comprises:
A mobile communication method characterized by transmitting data at the requested maximum transmission rate. A mobile communication method for a mobile communication system, comprising: a wireless terminal; a second system connected to the wireless terminal; and a first system connected to the second system via a communication line,
Identifying the line capacity of the communication line and confirming the quantity of simultaneously connected wireless terminals that are simultaneously connected to the second system among the wireless terminals;
Determining a maximum transmission rate from the first system to the second system based on the line capacity and the number of simultaneously connected wireless terminals;
Requesting data transmission at the maximum transmission rate from the second system to the first system;
And setting the requested maximum transmission rate in the first system and transmitting data from the first system to the second system. Determining whether the data accumulation rate in the reception buffer of the second system exceeds an upper threshold;
If the data accumulation rate exceeds the upper threshold, determining a transmission rate for reducing the data accumulation rate;
Requesting data transmission at the determined transmission rate from the second system to the first system;
The mobile communication method according to claim 14, further comprising: setting the requested transmission rate in the first system and transmitting data from the first system to the second system. 14. The maximum transmission rate is determined such that a product of the maximum transmission rate and the number of simultaneously connected wireless terminals is less than a product of the line capacity and a predetermined value. 14. The mobile communication method according to 14. The mobile communication method according to claim 13, wherein the first system is a radio network controller and the second system is a radio base station. A wireless base station computer that connects to a wireless terminal and receives data at a predetermined transmission rate from a wireless network control device via a communication line,
A function for confirming the line capacity of the communication line and the number of simultaneously connected wireless terminals that are simultaneously connected to the wireless base station among the wireless terminals;
A function for determining a maximum transmission rate that maximizes the transmission rate based on the line capacity and the number of the simultaneously connected wireless terminals;
A mobile communication program for realizing a function of requesting the radio network control device to transmit data at the maximum transmission rate. A function for determining whether or not a data storage rate in a reception buffer included in the wireless base station exceeds an upper threshold;
The mobile communication program according to claim 18, wherein when the data accumulation rate exceeds the upper limit threshold, a function for obtaining a transmission rate for reducing the data accumulation rate is realized. 19. The maximum transmission rate is determined so that a product of the maximum transmission rate and the number of simultaneously connected wireless terminals is less than a product of the line capacity and a predetermined value. The mobile communication program described.

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