JP2006319411A - Wireless network control method and wireless communication system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a wireless network control method and a wireless communication system for carrying out high speed downlink packet transmission with a downlink shared channel such as the HSDPA system providing a prescribed or higher rate or in average to mobile stations receivable of data transmission using the downlink shared channel. <P>SOLUTION: The wireless network control method and the wireless communication system disclosed herein calculate the maximum transmission rate of the downlink shared channel in the case of consecutively transmitting data with a power assigned to the downlink shared channel, on the basis of the transmission power of all the channels, of a transmission power other than that of the downlink shared channel for high speed downlink packet transmission, and of a transmission rate of the downlink shared channel so as to place a limit on addition of the number of the mobile stations receivable of data transmission using the downlink shared channel when the system judges that the average maximum transmission rate per mobile station is lower than a prescribed rate. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a radio communication system that performs high-speed downlink packet transmission using a downlink shared channel, and a radio network control method in the radio communication system.

  As a method for transmitting data from a base station control device of a mobile communication system to a mobile station in a cell controlled by the base station controlled by the base station control device, a standardization project for third generation mobile communication systems 3GPP (3rd Group Partnership) Project) specifications (for example, see Non-Patent Document 1 and Non-Patent Document 2) and the like define a method using a downlink dedicated channel (DPCH) and an HSDPA (High Speed Downlink Packet Access) method. Has been.

  DPCH is an individual channel set for each mobile station. On the other hand, in the HSDPA system, a downlink shared channel (HS-PDSCH: High Speed-Physical Downlink Shared Channel), a downlink shared control channel (HS-SCCH: High Speed-Shared Control Channel), and downlink control are used as downlink channels. DPCH needs to be set. HS-PDSCH and HS-SCCH are used for time division between mobile stations. HS-PDSCH is a channel for data transmission, and HS-SCCH is a channel for controlling data transmission from the base station to the mobile station. The DPCH for control is particularly called A-DPCH (Associated DPCH).

  The DPCH (including A-DPCH) is subjected to closed-loop transmission power control so that the reception quality of the mobile station is constant. On the other hand, HS-PDSCH and HS-SCCH used in HSDPA are assigned the remaining power assigned to the common channel and DPCH such as CPICH (Common Pilot Channel) and FACH (Forward Access Channel).

  When receiving data from the base station using DPCH or HSDPA, the mobile station requests the base station controller to establish DPCH. The base station controller performs admission control to estimate the increasing cell load by establishing the DPCH, and permits the establishment of the DPCH if the estimated load is smaller than the threshold, If the estimated load is equal to or greater than the threshold value, establishment of DPCH is rejected (see, for example, Non-Patent Document 3). In addition, the threshold value of permission control can be set independently for DPCH and A-DPCH.

  In the above wireless network control method, there is a problem in that power is allocated by the base station and permission control is performed by the base station control device. That is, the base station allocates power to the common channel and DPCH with priority, and allocates the rest to the HSDPA channel. Therefore, even if the allocated power of the channel for HSDPA decreases, the base station cannot regulate the use of DPCH. Also, the base station control device cannot regulate the use of DPCH without information on the total transmission power of the base station and the power allocated to HSDPA.

  In order to solve the above problem, Non-Patent Document 4 of the 3GPP specification describes the total transmission power of the base station as a measurement value (Common Measurement) in units of cells reported from the base station to the base station controller. TCP (Transmitted Carrier Power), NHP (Non-HSDPA Power), required power (HS-DSCH Required Power), PBR (HS-DSCH Provided Bit Rate), and the like are defined. HS-DSCH is a transport channel name of HS-PDSCH. NHP is defined as “Transmitted Carrier Power of All Codes not used for HS-PDSCH or HS-SCCH transmission” and represents transmission power of channels other than HS-PDSCH and HS-SCCH. The required power (HS-DSCH Required Power) represents the minimum transmission power necessary for a guaranteed transmission rate (Guaranteed Bit Rate, hereinafter referred to as GBR). PBR represents a transmission rate within a predetermined time. Non-Patent Document 5 describes an example of a radio network control method using TCP and NHP in the measurement value in units of cells reported from the base station to the base station controller.

  The wireless network control method described in Non-Patent Document 5 is a control method using admission control based on transmission power as in the following equation.

P _nonHS + P _{tot, adm} + C ≦ P _LAC
P _nonHS represents Non-HSDPA Power in the measurement value reported from the base station to the base station controller, and P _{tot, adm} is the power increment of the mobile station permitted to establish DPCH after the notification of the measurement value. C represents the expected power increment of the mobile station performing admission control, and P _LAC represents the admission control threshold. In this non-patent document 5, the use of DPCH is restricted by lowering P _LAC to secure the power allocated to HSDPA.
3GPP TS25.211 V5.5.0 (2003-09) 3GPP TS25.858 V5.0.0 (2002-03) Harri Holma and Antti Toskala, WCDMA for UMTS, UK, 2001, P211-213 3GPP TS25.433 V5.9.0 (2004-06) Kimmo Hiltunen et al., Performance of Link Admission Control in a WCDMA System with HS-DSCH and Mixed Services, PIMRC 2004

  However, in the conventional wireless network control method as described above, if the admission control threshold value is set high, the use of A-DPCH cannot be regulated, and the number of mobile stations received by the HSDPA method increases significantly. Therefore, there is a problem that the transmission rate per user of the mobile station receiving the HSDPA method is remarkably lowered.

  In addition, in order to solve the above problem, if the threshold value of the admission control is set low, the use of A-DPCH is restricted, so that there is a problem that the number of mobile stations received by the HSDPA method is remarkably limited. .

  Similarly, the conventional radio network control method has a problem that GBR cannot be guaranteed. This is because the threshold value for permission control and individual GBR are not related, and thus required power (HS-DSCH Required Power) may not be ensured.

  An object of the present invention is to provide an average transmission of a certain level or more to a mobile station capable of receiving data transmission using a downlink shared channel in a wireless communication system that performs high-speed downlink packet transmission using a downlink shared channel such as the HSDPA scheme. To provide a radio network control method and a radio communication system capable of providing a rate and reliably guaranteeing a guaranteed transmission rate.

In order to achieve the above object, the wireless communication system of the present invention comprises means for transmitting data to a mobile station using a downlink shared channel and means for transmitting a signal to the mobile station using another downlink channel. In a radio communication system having a base station and a base station controller for controlling the base station,
The base station
A transmission power measuring unit that measures transmission power of all channels being transmitted and transmission power other than the downlink shared channel;
A transmission rate measuring unit for measuring a transmission rate of the downlink shared channel,
The base station controller is
While measuring the number of mobile stations allowed to receive data transmitted using the downlink shared channel, the transmission rate measured by the transmission rate measuring unit, the transmission power of all channels, and the downlink shared channel A downlink shared channel operation state calculation unit for calculating a maximum transmission rate of the downlink shared channel when data is continuously transmitted with power that can be allocated to the downlink shared channel from transmission power other than
When there is a new downlink shared channel usage request from a mobile station, based on the maximum transmission rate and the number of mobile stations, per mobile user when the mobile station is permitted to use the downlink shared channel A downlink shared channel that calculates a maximum transmission rate and permits a downlink shared channel use request when the maximum transmission rate per user is greater than a predetermined threshold, and rejects a use request when the maximum transmission rate is less than the threshold. And a usage determination unit.

  According to the present invention, if the maximum transmission rate per mobile station when data is continuously transmitted with the power allocated to the downlink shared channel is equal to or less than a predetermined threshold, the new use of the downlink shared channel is rejected. Therefore, it becomes possible to provide a transmission rate of a certain level or higher on average to the mobile station using the downlink shared channel.

  Further, the downlink shared channel usage determination unit, when there is a new downlink shared channel usage request from the mobile station, if the value obtained by adding 1 to the mobile station is a predetermined number or more, You may make it refuse.

  According to the present invention, when the number of mobile stations using the downlink shared channel is likely to be a predetermined number or more, the downlink shared channel usage request from the mobile station is rejected. It is possible to set the upper limit of the number of mobile stations that can be performed.

Further, another wireless communication system of the present invention includes a base station comprising means for transmitting data to a mobile station using a downlink shared channel and means for transmitting a signal to the mobile station using another downlink channel, In a radio communication system having a base station controller for controlling the base station,
The base station
A transmission power measuring unit that measures transmission power of all channels being transmitted and transmission power other than the downlink shared channel;
A transmission rate measuring unit that measures the transmission rate of data of a quality class in which the transmission rate in the downlink shared channel is not guaranteed,
The base station controller is
The number of mobile stations that are allowed to receive data whose transmission rate is not guaranteed among mobile stations that are permitted to receive data transmitted using the downlink shared channel is measured by the transmission rate measuring unit. The downlink sharing when data is continuously transmitted from the transmission rate, the transmission power of all the channels, and the transmission power other than the downlink sharing channel with the power that can be allocated to the downlink sharing channel. A downlink shared channel operation state calculation unit for calculating a maximum transmission rate of data for which a transfer rate in the channel is not guaranteed and calculating a total value of guaranteed transmission rates for data transmission in which the transmission rate in the downlink shared channel is guaranteed;
When there is a request for use of a new downlink shared channel from the mobile station, based on the maximum transmission rate of data for which the transmission rate is not guaranteed, the number of mobile stations, and the total value of the guaranteed transmission rate, When the use of the downlink shared channel is permitted, the maximum transmission rate per user for which the transmission rate is not guaranteed is calculated, and when the maximum transmission rate per user is larger than a predetermined threshold, the use request of the downlink shared channel is calculated. And a downlink shared channel usage determining unit that rejects the usage request when the threshold value is below the threshold.

Further, another wireless communication system of the present invention includes a base station comprising means for transmitting data to a mobile station using a downlink shared channel and means for transmitting a signal to the mobile station using another downlink channel, In a radio communication system having a base station controller for controlling the base station,
The base station
A transmission power measuring unit that measures transmission power of all channels being transmitted and transmission power other than the downlink shared channel;
A transmission rate measuring unit for measuring a transmission rate of data of a quality class whose transmission rate in the downlink shared channel is not guaranteed and a transmission rate of data of a quality class whose transmission rate is not guaranteed;
The base station controller is
Measures the number of mobile stations allowed to receive data whose transmission rate is not guaranteed among mobile stations allowed to receive data transmitted using the downlink shared channel, and measured by the transmission rate measuring unit The data is continuously transmitted with the power that can be allocated to the downlink shared channel from the transmission rate of the data for which the transmission rate is not guaranteed, the transmission power of all the channels, and the transmission power other than the downlink shared channel. A downlink shared channel operation state calculation unit for calculating a maximum transmission rate of data for which a transfer rate in the downlink shared channel is not guaranteed when transmitting
When there is a request to use a new downlink shared channel from the mobile station, based on the maximum transmission rate, the number of mobile stations, and the transmission rate of data for which the transmission rate is guaranteed, the mobile station When the use of the downlink shared channel is permitted, the maximum transmission rate per user for which the transmission rate is not guaranteed is calculated, and when the maximum transmission rate per user is greater than a predetermined threshold, a request for using the downlink shared channel is issued. A downlink shared channel usage determining unit that permits and rejects a usage request when the threshold is not more than a threshold value.

  According to the present invention, even when data with a guaranteed transmission rate and data with a non-guaranteed transmission rate are transmitted using the downlink shared channel, the mobile station using the downlink shared channel is transmitted. It becomes possible to provide a transmission rate above a certain level on average.

  In addition, the downlink shared channel operation state calculation unit may update the maximum transmission rate in accordance with an increase or decrease in the number of mobile stations permitted to receive data for which the transmission rate is not guaranteed.

Furthermore, another wireless communication system of the present invention comprises a base station comprising means for transmitting data to a mobile station using a downlink shared channel and means for transmitting a signal to the mobile station using a downlink dedicated channel, In a wireless communication system having a base station control device for controlling a base station,
The base station
A base station operating unit that calculates a total value of guaranteed transmission rates of data transmissions with guaranteed transmission rates in the downlink shared channel;
A transmission power measuring unit that measures transmission power of all channels being transmitted, transmission power other than the downlink shared channel, and transmission power of data with a guaranteed transmission rate in the downlink shared channel;
A transmission rate measuring unit for measuring a transmission rate of data of a quality class whose transmission rate in the downlink shared channel is not guaranteed;
Necessary for the downlink shared channel to satisfy the total value of the guaranteed transmission rates from the transmission rate of the data for which the transmission rate is guaranteed and the transmission power of the data for which the transmission rate is guaranteed in the downlink shared channel. A required power calculation unit for calculating power,
The base station controller is
The number of mobile stations that are allowed to receive data whose transmission rate is not guaranteed among mobile stations that are permitted to receive data transmitted using the downlink shared channel is measured by the transmission rate measuring unit. A downlink shared channel operation state calculator that calculates power that can be allocated to the downlink shared channel from the transmission rate, the transmission power of all the channels, and the transmission power other than the downlink shared channel;
And an individual channel restriction determination unit that restricts use of the downlink dedicated channel when power that can be allocated to the downlink shared channel is less than power required for the downlink shared channel.

  According to the present invention, the power that can be allocated to the downlink shared channel is reduced to the minimum power that is required to satisfy the guaranteed transmission rate provided in the downlink shared channel. If it is insufficient, by restricting the use of dedicated channels and lowering the total transmission power of dedicated channels, the allocated power for downlink shared channels is increased to ensure the required minimum power. The guaranteed transmission rate is surely guaranteed.

  Further, the dedicated channel restriction determination unit restricts establishment of the downlink dedicated channel and sets the predetermined threshold when the cell load expected by establishment of the downlink dedicated channel is higher than a predetermined threshold. By lowering, the use of the downlink dedicated channel is regulated.

  Further, the dedicated channel restriction determination unit may restrict use of the downlink dedicated channel by lowering a transmission rate of the downlink dedicated channel.

  According to the present invention, since the rate of the dedicated channel is lowered, the total transmission power of the dedicated channel is lowered, so that the necessary power can be ensured.

  In addition, the dedicated channel restriction determination unit may restrict use of the downlink dedicated channel by releasing the downlink dedicated channel.

  According to the present invention, since the dedicated channel is released, the total transmission power of the dedicated channel is lowered, so that the necessary power can be ensured.

  Furthermore, the downlink shared channel operation state calculation unit may update the necessary power according to an increase or decrease in the number of mobile stations in a state where the data with the guaranteed transmission rate can be received.

As described above, according to the present invention, the following effects can be obtained.
(1) If the maximum transmission rate when data is continuously transmitted with the power allocated to the downlink shared channel per mobile station is below a predetermined threshold value, new sharing of the downlink shared channel is rejected. A transmission rate higher than a certain level can be provided to channel users on average.
(2) When the power allocated to the downlink shared channel is insufficient with respect to the minimum power required to satisfy the guaranteed transmission rate provided in the downlink shared channel, the use of the dedicated channel is regulated and downloaded. Since the required minimum power is ensured by increasing the allocated power for the shared channel, the guaranteed transmission rate is reliably guaranteed.

  Next, embodiments of the present invention will be described in detail with reference to the drawings.

(First embodiment)
FIG. 1 is a block diagram showing an example of the basic configuration of a base station and a base station controller (RNC: Radio Network Controller) in the wireless communication system according to the first embodiment of the present invention. This embodiment is a configuration in the case where only the best effort class (hereinafter referred to as BE (Best Effort) class) in which the bit rate is not guaranteed is provided by the HSDPA method as the quality of service (QoS) class.

  Referring to FIG. 1, the base station 1 includes a base station operation unit 11 connected to a plurality of mobile stations (not shown), a transmission power measurement unit 12, and a transmission rate measurement unit 13. The base station control device 2 includes a base station control unit 21 connected to a network (not shown), an HSDPA operation state calculation unit 22, and an HSDPA usage determination unit 23.

  The base station operation unit 11 has the same function as that of the base station used in the third generation mobile communication system, and since its configuration and operation are well known, the description thereof is omitted.

  The transmission power measuring unit 12 measures TCP, which is the transmission power of all channels being transmitted, and NHP, which is transmission power other than HSDPA, which is the downlink shared channel, and at the timing measured by the base station operation unit 11 The average value of TCP and NHP is reported to the HSDPA operation state calculation unit 22 of the base station controller 2. Information measured by the transmission power measurement unit 12 is also shared by the base station control unit 11.

The transmission rate measuring unit 13 measures the number of bits transmitted using the HS-DSCH, and at the timed timing instructed to the base station operating unit 11, the PBR, which is the transmission rate per unit time of the HS-DSCH, is set in the HSDPA operation. Report to the state calculator 22. Information measured by the transmission rate measuring unit 13 is also shared by the base station control unit 11. The PBR can be measured for each QoS class, and the BE class PBR is defined as PBR _be .

  When there is a request for using HSDPA from the mobile station, the base station control unit 21 requests the HSDPA use determination unit 23 to determine new use, and determines permission for new use according to the determination result. In addition, the base station control unit 21 instructs the HSDPA operation state calculation unit 22 to update parameters in accordance with the increase or decrease in the number of mobile stations using HSDPA. The base station control unit 21 has the same functions as those of the base station control device used in the third generation mobile communication system with respect to other functions, and its configuration and operation are well known. Omitted.

  The HSDPA operation state calculation unit 22 calculates the operation state of HSDPA using the report value from the base station 1 and holds the calculation result. Specifically, the HSDPA operation state calculation unit 22 continuously transmits data with power that can be allocated to HSDPA from the transmission rate measured by the transmission rate measurement unit 13 and TCP and NHP. Calculate the maximum transmission rate for the case. In addition, the HSDPA operation state calculation unit 22 measures the number of mobile stations waiting for HSDPA data transmission and updates parameters according to the increase or decrease of the number of mobile stations. Information received from the base station 1 and information calculated by the HSDPA operation state calculation unit 22 are shared inside the base station apparatus 2.

  When the HSDPA usage determination unit 23 is requested by the base station control unit 21 to determine the new usage of HSDPA, the HSDPA usage determination unit 23 estimates the HSDPA operating state and notifies the base station control unit 21 of the determination result of the new usage. Specifically, when there is a new HSDPA usage request from the mobile station, the HSDPA usage determination unit 23 determines this based on the maximum transmission rate and the number of mobile stations calculated by the HSDPA operation status calculation unit 22. The maximum transmission rate per user when the use of HSDPA is permitted to the mobile station that has made a use request is calculated. The HSDPA usage determining unit 23 permits the HSDPA usage request when the maximum transmission rate per user is larger than a predetermined threshold, and rejects the usage request when the maximum transmission rate is less than the threshold.

  In FIG. 1, the transmission power measurement unit 12 and the transmission rate measurement unit 13 are illustrated in the base station 1, but these units may be allocated to the base station 1 and the base station control device 2. . Similarly, in FIG. 1, the HSDPA operation state calculation unit 22 and the HSDPA usage determination unit 23 are illustrated in the base station controller 2, but these units are allocated to the base station 1 and the base station controller 2. Is also possible. In FIG. 1, the base station 1 and the base station control device 2 are illustrated as independent devices, but may be configured as one device. In FIG. 1, only one base station 1 is shown, but the base station control device 2 can be connected to a plurality of base stations.

  Next, the operation of the wireless communication system of this embodiment will be described with reference to the drawings.

  Here, the QoS class will be described as being composed of two classes, a CS (Conversational) class and a BE class for providing a voice call. Here, since the present embodiment provides only the BE class by the HSDPA method, the CS class is accommodated by DCH. In the BE class, mobile stations that support HSDPA are accommodated by the HSDPA method, and other mobile stations are accommodated by DCH.

  FIG. 2 is a flowchart showing the operation of the base station control unit 21 when the mobile station 1 requests use of HSDPA. When there is a usage request for HSDPA from the mobile station, the base station control unit 21 requests the HSDPA usage determination unit 23 to determine new usage (step S1). When the HSDPA usage determination unit 23 determines that the access is permitted (step S2), the base station control unit 21 connects the mobile station 1 to A-DCH (A-DCH corresponds to the A-DPCH of the physical channel). It is determined whether it has been completed (step S3). When the A-DCH has been connected, the base station control unit 21 permits the mobile station 1 to use HSDPA (step S4), and instructs the HSDPA operation state calculation unit 22 to update parameters (step S5). If the A-DCH has not been connected, the base station control unit 21 performs admission control to determine whether or not to permit connection of the A-DCH (step S6), and determines that it is permitted. In this case, after the A-DCH is connected (step S7), the use of HSDPA is permitted. Further, when the HSDPA usage determining unit 23 determines that it is rejected (step S2), or when admission control is performed and it is determined that the A-DCH connection is rejected (step S6), the base station control unit 21 Rejects the use of HSDPA by the mobile station 1 (step S8).

  Although not shown, the base station control unit 21 instructs the HSDPA operation state calculation unit 22 to update parameters even when the A-DCH is released and the HSDPA is terminated.

  The load r for permission control according to the present invention is calculated by the following equation.

r = Σ (SIR _i / SF _i )
r represents the calculated load, SIR _i represents the required quality of DCH (including A-DCH) established by mobile station i, and SF _i represents the spreading factor of DCH established by mobile station i ( Spreading factor), and Σ represents taking the sum of all SIR _i / SF _i of the established DCH. The required quality (SIR: Signaling to Interference Ratio) is an SIR necessary to satisfy a predetermined error rate, and is determined by a combination of a modulation scheme, a coding rate, and SF.

_Assuming that the threshold of admission control for A-DCH is _ra DCH and the load increase of the cell of the mobile station that newly requested establishment of A-DCH is (SIR _new / SF _new ), the new A-DCH Conditions for permitting establishment are as follows.

Σ (SIR _i / SF _i ) + (SIR _new / SF _new ) <r _aDCH
The threshold value for admission control can be set to a different value for each QoS class that receives data on A-DCH and DCH.

The HSDPA operating state calculation unit 22 sets the maximum transmission rate of the BE class (HS-DSCH Available Bit Rate, hereinafter referred to as ABR _be ) when data is continuously transmitted with the power allocated to HSDPA on average as the HSDPA operating state. Calculate Also, the number N of mobile stations is updated in accordance with the increase or decrease in the number of mobile stations waiting for HSDPA data transmission. The number N of BE class mobile stations is N _be .

FIG. 3 is a flowchart showing the operation of the HSDPA operation state calculation unit 22. The HSDPA operation state calculation unit 22 determines whether PBR _be is notified from the transmission rate measurement unit 13 (step S11) or whether TCP and NHP are notified from the transmission power measurement unit 12 (step S12). When at least one of them is notified, the HSDPA operation state calculation unit 22 calculates ABR _be indicating the operation state of HSDPA, and holds this ABR _be (step S13). When none of TCP, NHP, and PBR _be is notified, the HSDPA operation state calculation unit 22 determines whether there is an instruction to update parameters from the base station control unit 21 (step S14). When there is an instruction to update parameters, the HSDPA operation state calculation unit 22 updates N _be with the following equation (step S15).

(When the number of mobile stations increases) N _be = N _be +1
(When the number of mobile stations decreases) N _be = N _be −1
ABR _be is calculated in the following order.

First, the HSDPA operating state calculation unit 22 calculates the power P _usable that is allocated to HSDPA on average by the following equation.

_{P usable = Medium (P max -NHP} -P margin, P hs _ max, P hs _ min)
Here, P _max represents the maximum power of the base station, P _margin represents the _margin for P _usable , P _hs — _max represents the maximum maximum transmission power of HS-PDSCH and HS-SCCH, and P _{hs — min} Represents the total minimum transmission power of HS-PDSCH and HS-SCCH. Medium (X, Y, Z) is an expression for selecting an intermediate value of three values. For example, if X = 1, Y = 2, and Z = 3, Medium (1, 2, 3) = 2.

Next, U _pt which is the time usage rate of P _usable is calculated by the following formula.

U _pt = (TCP-NHP) / P _usable
In this embodiment, when P _usable is 0, U _pt is not calculated.

Next, ABR _be is calculated from PBR _be and U _pt as in the following equation.

ABR _be = PBR _be / U _pt
In this embodiment, when PBR _be is 0 or U _pt is not calculated, ABR _be is not updated. In order to increase the accuracy of ABR _be , the measurement times of TCP, NHP, and PBR _{be in} the transmission power measurement unit 12 and the transmission rate measurement unit 13 are synchronized with the report timing to the HSDPA operation state calculation unit 22. It is desirable that

  FIG. 4 is a flowchart showing the operation of the HSDPA usage determination unit 23.

The HSDPA usage determination unit 23 compares N _be +1 and N _bemin when there is a request for determination of new usage of HSDPA from the base station control unit 21 (step S21). When N _be +1 is _{equal to} or less than N _bemin , the HSDPA usage determination unit 23 notifies the base station control unit 21 of permission (step S23). When N _be +1 is larger than N _bemin , the HSDPA usage determination unit 23 compares ABR _be / (N _be +1) with the threshold value α of ABR _be for one user (step S22). The threshold value α represents a threshold value for determining acceptance of a new mobile station. That is, if the ABR _be per user after newly accepting the mobile station is larger than a predetermined threshold value α, the base station control unit 21 is notified of permission (step S23), and if it is smaller or equal, the rejection is made. Notification is made (step S24). By setting the N _Bemin, regardless of the operating state of the HSDPA, up to N _Bemin pieces can allow the HSDPA usage in the mobile station. If N _bemin = 0, the operation is the same as when N _bemin is not set.

  Next, the operation of the wireless communication system of this embodiment will be described using a specific example.

The operation example of FIG. 3 will be described. The base station 1 reports TCP, NHP, and PBR to the base station controller 2 at the same time, and reports the average value of the nearest 100 milliseconds at the time of reporting with this reporting period being 5 seconds. And For example, if the time at the reporting time is 00: 00: 05: 00 ms, the average value from 00: 00: 04: 900 ms to 00: 00: 05: 00 is reported. The parameters are P _max = 20 W, P _margin = 2 W, P _{hs — max} = 15 W, and P _{hs — min} = 2 W. Now, _assuming that the HSDPA operation state calculation unit 22 receives a report of TCP = 15W, NHP = 10W, PBR _be = 2 Mbps (steps S11, S12), P _usable , U _pt , and ABR _be are as follows: (Step S13).

_{P usable = Medium (P max -NHP} -P margin, P hs _ max, P hs _ min)
= Medium (20-10-2, 15, 2)
= 8W
U _pt = (TCP-NHP) / P _usable = (15-10) /8=0.625
ABR _be = PBR _be / U _pt = 2 / 0.625 = 3.2 Mbps
Next, an operation example of FIG. 4 will be described. The parameters are N _bemin = 1 and α = 100 kbps. Now, assuming that N _be = 9, it is assumed that a determination request for new use of HSDPA is received from the base station control unit 21. The HSDPA usage determining unit 23 is N _be + 1 = 10, so N _be + 1 ≦ N _bemin in step S21 is not satisfied, but ABR _be / (N _be +1) = 3.2 / 10 = 320 kbps. Since ABR _be / (N _be +1)> α is satisfied (step S22), the base station control unit 21 is notified of permission.

According to the wireless communication system of the present embodiment, when the maximum transmission rate ABR _be per mobile station when data is continuously transmitted with the power allocated to HSDPA is equal to or less than a predetermined threshold value α, a new HSDPA Since the use request is rejected, it becomes possible to provide a transmission rate of a certain level or higher on average to a mobile station using HSDPA.

(Second Embodiment)
Next, a radio communication system according to a second embodiment of this invention will be described.

  The configuration of the wireless communication system according to the present embodiment is the same as the wireless communication system according to the first embodiment shown in FIG. 1 except that the operation of the HSDPA usage determination unit 23 is partially different. Therefore, the description thereof is omitted.

  Next, the operation of this embodiment will be described with reference to the drawings.

The operation of the HSDPA usage determination unit 23 in this embodiment is different from that of the first embodiment in that the flowchart of FIG. 4 is changed to FIG. Referring to FIG. 5, the operation of the second embodiment of the present invention is different from that of the first embodiment in that step S31 is added between step S21 and step S22 of FIG. That is, the HSDPA usage determining unit 23 compares N _be +1 and N _bemin (step S21), and if N _be +1 is larger than N _bemin , N _be +1 is compared with N _bemax (step S31). When N _be +1 is larger than N _bemax , the HSDPA usage determination unit 23 notifies the base station control unit 21 of rejection (step S24). When N _be +1 is _{equal to} or less than N _bemax , the HSDPA usage determining unit 23 compares ABR _be / (N _be +1) with α (step S22).

According to the present embodiment, by setting N _bemax , it is possible to limit the number of mobile stations that can use HSDPA.

(Third embodiment)
Next, a radio communication system according to a third embodiment of this invention will be described.

  FIG. 6 is a block diagram showing an example of a basic configuration of a base station and a base station control device according to the third embodiment of the present invention. In the present embodiment, in the HSDPA system, a configuration in which a BE class whose transmission rate is not guaranteed and a streaming class (hereinafter referred to as ST (Streaming) class) whose transmission rate is guaranteed is provided as a QoS class. It is. This ST class is a class that provides streaming data such as a video signal.

  As shown in FIG. 6, the wireless communication system according to the present embodiment includes a base station 31 and a base station control device 32. The base station 31 includes a base station operation unit 41, a transmission power measurement unit 42, a transmission rate measurement unit 43, and a required power calculation unit 44. The base station control device 32 includes a base station control unit 51, an HSDPA operation state calculation unit 52, an HSDPA usage determination unit 53, and a DCH restriction determination unit 54.

  Compared with the configuration of the first embodiment shown in FIG. 1, the third embodiment corresponds to the ST class, so that the base station 31 is provided with a required power calculation unit 44, and the base station The control device 32 is different in that a DCH restriction determination unit 54 is provided.

In addition to the function of the base station operation unit 11 in the first embodiment shown in FIG. 1, the base station operation unit 41 receives each ST class mobile station waiting for HSDPA data transmission from the base station control unit 51. of receiving the GBR information, it has a function of holding calculates the GBR _total a GBR of summation. The calculated information can be shared within the base station 31.

In addition to the function of the transmission power measurement unit 12 in the first embodiment shown in FIG. 1, the transmission power measurement unit 42 measures the average value P _st of the transmission power of the HS-PDSCH used in ST class data transmission. .

The transmission rate measuring unit 43 measures two PBRs of the BE class PBR _be and the ST class PBR _st , and reports them to the HSDPA operation state calculation unit 52.

The required power calculation unit 44 uses the P _st measured by the transmission power measurement unit 42 and the PBR _st measured by the transmission rate measurement unit 43 at the timed timing instructed to the base station operation unit 41. The required power (HS-DSCH Required Power) (hereinafter referred to as P _req ), which is the minimum power required to satisfy all the GBRs provided in FIG. Information calculated by the required power calculation unit 44 can also be shared by the base station control unit 51.

  In addition to the function of the base station control unit 21 in the first embodiment shown in FIG. 1, the base station control unit 51 displays the GBR information of the ST class mobile station waiting for HSDPA data transmission, When the use is permitted, the base station operating unit 41 is notified. Further, at a predetermined timing, the DCH restriction determination unit 54 is requested to determine whether or not to restrict a mobile station that is performing data reception on the DCH.

  The DCH restriction determination unit 54 determines whether or not to restrict the mobile station that is performing data reception on the DCH from the calculation result of the HSDPA operation state calculation unit 52, and determines to the base station control unit 51 according to the determination result. Restrict DCH.

  Next, the operation of this embodiment will be described with reference to the drawings.

  Here, the QoS class will be described as being composed of three classes: a CS class, a BE class, and an ST class. Here, since the present embodiment provides the BE class and the ST class by the HSDPA method, the CS class is accommodated by the DCH. In the BE class and the ST class, mobile stations supporting HSDPA are accommodated by the HSDPA method, and other mobile stations are accommodated by DCH. Further, a plurality of rates can be set for the BE class DCH.

The required power calculation unit 44 calculates P _req by the following formula at the timing measured by the base station operation unit 41 and reports it to the HSDPA operation state calculation unit 52.

P _req = P _st / PBR _st × GBR _total
The required power calculation unit 44 sets P _req to 0 W when PBR _st is 0. In order to increase the accuracy of P _req , it is desirable that the measurement times of P _st and PBR _st be synchronized.

  The flowchart showing the operation of the base station control unit 51 when there is a request to use HSDPA from the mobile station is the same as the flowchart of FIG. 2 of the first embodiment.

HSDPA operation state calculation unit 52, as the operating state of the HSDPA, in addition to the parameters calculated in the first embodiment, calculates the Cost _st a required power per GBR, the GBR _total a GBR of summation. Also, the number of ST class mobile stations to be updated is set to N _st in accordance with the increase or decrease of the number of mobile stations waiting for data transmission in the HSDPA system.

FIG. 7 is a flowchart showing the operation of the HSDPA operation state calculation unit 52. Compared with the flowchart in the first embodiment shown in FIG. 2, the HSDPA operation state calculation unit 52 in this embodiment adds steps S41 to S44 to FIG. 2 in order to correspond to the ST class. This is different from the first embodiment. That is, the HSDPA operation state calculation unit 52 determines whether or not P _req is notified from the required power calculation unit 44 (step S41). If notified, the Cost _st that is the required power per GBR is set as follows. Calculation is performed using an equation (step S42).

Cost _st = P _req / GBR _total
In the present embodiment, when P _req or GBR _total is 0, Cost _st is not updated.

Further, the calculation formula of ABR _be in step S13 is the following formula in order to consider the radio resources used by the ST class.

ABR _be = Max (PBR _be / U _pt -GBR _total , 0)
Here, Max (X, Y) is an expression for selecting a large value of X and Y. Max () is used so that ABR _be does not become less than 0 due to calculation error.

Further, when there is an instruction for parameter update from the base station control unit 51 (step S14), the HSDPA operation state calculation unit 52 stops the mobile station that newly starts using HSDPA or the use of HSDPA. It is determined whether or not the QoS class of the mobile station is an ST class (step S43). In the case of the ST class, the HSDPA operation state calculation unit 52 updates N _st , GBR _total , P _req , and ABR _{be according} to the following procedure. Hereinafter, for the sake of explanation, the parameters before update are N _{st, old} , GBR _{total, old} and P _{req, old, respectively,} and the parameters after update are N _{st, new} , GBR _{total, new} and P _{req, new} .

The HSDPA operation state calculation unit 52 updates N _st by the following formula.
(When the number of mobile stations increases) N _{st, new} = N _{st, old} +1
(When the number of mobile stations decreases) N _{st, new} = N _{st, old} −1
Next, the HSDPA operation state calculation unit 52 updates GBR _total with the following equation. GBR _i represents the GBR of a mobile station that newly starts using HSDPA or releases A-DCH and stops using HSDPA.
(When the number of mobile stations increases) GBR _{total, new} = GBR _{total, old} + GBR _i
(When the number of mobile stations decreases) GBR _{total, new} = GBR _{total, old} -GBR _i
Next, the HSDPA operation state calculation unit 52 updates P _req with the following equation. By using Cost _st , it is possible to estimate fluctuations in P _req due to increase or decrease in the number of mobile stations.

(When N _{st, new} is 0) P _{req, new} = 0
(When N _{st, new} is not 0) P _{req, new} = Max (P _{req, old} + Cost _st × (GBR _{total, new−} GBR _{total, old} ), 0)
Max () is used so that P _{req, new} does not become less than 0 due to calculation error.

Next, ABR _re is updated using the same formula as in step S13.

ABR _be = Max (PBR _be / U _pt -GBR _{total, new} , 0)
FIG. 8 is a flowchart showing the operation of the HSDPA usage determination unit 53.

Referring to FIG. 8, the operation of the HSDPA usage determination unit 53 of the present embodiment corresponds to the ST class. Therefore, steps S51 to S53 are added to the flowchart shown in FIG. 4 in the first embodiment. And different. That is, the HSDPA usage determination unit 53 determines whether the determination request for new usage of HSDPA is the ST class (step S51), and if it is the ST class, P _usable includes all GBR including the new GBR and the margin. It is determined whether it is possible to secure more than the minimum power required to satisfy (P _req + Cost _st × GBR _i + P _stmargin ) (step S52).

That is, the determination formula is as follows. P _stmargin represents a margin.

P _usable > P _req + Cost _st × GBR _i + P _stmargin
If it can be secured, the HSDPA usage determination unit 53 notifies the base station control unit 21 of permission (step S53), and if it cannot be secured, notifies the rejection (step S24). When it is a BE class (step S51), the HSDPA usage determination unit 53 performs the same operation as that of the first embodiment of FIG.

  FIG. 9 is a flowchart showing the operation of the DCH restriction determination unit 54.

The DCH restriction determination unit 54 compares N _st and N _streqmin when there is a determination request from the base station control unit 51 as to whether or not to restrict the mobile station performing data reception using the DCH (step S61). . When N _st is less than N _streqmin , the DCH restriction determination unit 54 sets the DCH permission control threshold r _be for receiving data in the BE class to the base station control unit 21 in order to release the DCH restriction as follows: It is increased by the equation (step S62).

r _be = Min (r _be + D _{be, up} , r _{be, max} )
D _{be, up} represents the step width of the above threshold value addition, and r _{be, max} represents the maximum value of the DCH admission control threshold for data reception in the BE class. Min (X, Y) is an expression for selecting a small value of X and Y.

When N _st is _{equal to} or greater than N _streqmin , the DCH restriction determination unit 54 determines the minimum power (P _req required for the P _usable calculated by the HSDPA operation state calculation unit 52 to satisfy all GBR including the margin P _reqmargin. It is determined whether it is less than + P _reqmargin ) (step S63). If P _usable is less than the minimum power required for satisfying all _GBRs , the DCH restriction determination unit 54 causes the base station control unit 21 to reduce r _be by the following expression in order to restrict DCH (step S1). S64).

r _be = Max (r _be −D _{be, down} , r _{be, min} )
D _{be, down} represents the step width of the above threshold value subtraction, and r _{be, min} represents the minimum value of the DCH admission control threshold for data reception in the BE class.

If P _usable is equal to or _larger than the value (P _req + P _reqmargin + P _stmargin ) _obtained by adding hysteresis P _reqhyst to the minimum power required to satisfy all GBR including the margin (step S65), DCH restriction determination unit 54, to release the regulation of DCH, the base station control unit 21, thereby updating the admission control threshold r _bE of DCH to perform data reception in bE class (step S62).

In order to regulate DCH, the number of DCH mobile stations that receive data in the BE class can be limited by lowering the threshold of admission control. As a result, the total transmission power of DCH decreases, and HSDPA allocation Electric power can be increased, and P _usable increases. In addition, it is easy to permit establishment of DCH by raising the threshold value of permission control in order to cancel the restriction of DCH. If N _st = 1, the DCH can be restricted if there is no mobile station waiting for HSDPA data transmission in the ST class.

As described above, P _req and ABR _be are updated according to the increase / decrease of the number of HSDPA mobile stations, so that the HSDPA operation state is accurately reflected to determine the new use of HSDPA and to restrict DCH. it can.

In the present embodiment, the DCH that performs data reception in the BE class is the target of restriction, but the admission control threshold r _cs of the DCH that performs data reception in another QoS class, that is, the CS class may be lowered.

  In this embodiment, the BE class and the ST class QoS are provided by the HSDPA method, but the present invention can be applied even when only the ST class is provided.

  Next, the operation of the wireless communication system of this embodiment will be described using a specific example.

An operation example of the HSDPA operation state calculation unit 52 illustrated in FIG. 7 will be described. It is assumed that TCP, NHP, PBR, and P _req are simultaneously reported to the HSDPA operation state calculation unit 52, and the average value of the most recent 100 milliseconds at the time of reporting is reported with this reporting period being 5 seconds. As in the first embodiment, the parameters are P _max = 20 W, P _margin = 2 W, P _{hs — max} = 15 W, and P _{hs — min} = 2 W. Further, N _st = 14 and GBR _total = 1000 kbps. Now, _assuming that the HSDPA operating state calculation unit 52 receives a report of TCP = 15 W, NHP = 10 W, PBR _be = 2 Mbps, P _req = 7 W (step S41), P _usable , U _pt , ABR _be , Cost _st is updated as follows (steps S42 and S13). Since the calculation formulas for P _usable and U _pt are the same as those in the first embodiment, a _description thereof will be omitted.

Cost _st = P _req / GBR _total = _7/1000 = 7 mW / kbps
P _usable = 8W
U _pt = 0.625
ABR _be = Max (PBR _be / U _pt -GBR _{total, new} , 0) = Max (2 / 0.625-1.0, 0) = 2.2 Mbps
Next, an operation example of the HSDPA usage determination unit 53 illustrated in FIG. 8 will be described. It is assumed that the determination request for new use of HSDPA is the ST class. The parameter is P _stmargin = 0.5W. Other parameters are the same as those described in the operation example of FIG. Now, assuming that GBR _i = 60 kbps for a mobile station that has requested a new use of HSDPA, P _usable = 8 W, and P _req + Cost _st × GBR _i + P _stmargin = 7.0 + 0.007 × 60 + 0.5 = 7. _92W , and P _usable > P _req + Cost _st × GBR _i + P _stmargin in step S52 is satisfied, so permission is notified to the base station control unit 51 (step S53). If permitted, the HSDPA usage determination unit 53 instructs the HSDPA operation state calculation unit 52 to update parameters (step S44 in FIG. 7). The parameters are updated as follows.

As the number of mobile stations increases,
N _{st, new} = N _{st, old} + 1 = 14 + 1 = 15
GBR _{total, new} = GBR _{total, old} + GBR _i = 1000 + 60 = 1060 kbps
P _{req, new} = Max (P _{req, old} + Cost _st × (GBR _{total, new−} GBR _{total, old} ), 0)
= Max (7 + 0.007 × (1060-1000), 0)
= 7.42W
ABR _be = Max (PBR _be / U _pt -GBR _{total, new} , 0)
= Max (2 / 0.625-1.06, 0)
= 2.14Mbps
Next, an operation example of the DCH restriction determination unit 54 illustrated in FIG. 9 will be described. It is assumed that the base station control unit 21 requests the DCH restriction determination unit 24 to determine the DCH restriction at a cycle of 5 seconds. Also, the parameters are N _streqmin = 1, P _reqmargin = 1 W, P _reqhyst = 1 W, r _{be, max} = 0.60, r _{be, min} = 0.30, D _{be, up} = 0.03, D _{be, down} = 0.03. The other parameters are the values in the embodiment of FIGS. 7 and 8, and are updated parameters when they are updated. Now, DCH regulation determination unit 24, and that it has received the determination request of the regulation of DCH, and the r _be = 0.54, in the step S61, because it does not satisfy the _{N st} <N streqmin, the process proceeds to step S62. Next, since P _req + P _reqmargin = 7.42 + 1 = 8.42, it does not satisfy P _usable <P _req + P _reqmargin in step S63, so the base station control unit 21 updates r _be to regulate DCH. (Step S64). _rb is updated as follows.

r _be = Max (r _be −D _{be, down} , r _{be, min} ) = Max (0.54−0.03, 0.30) = 0.51
(Fourth embodiment)
Next, a wireless communication system according to a fourth embodiment of the present invention will be described.

  The configuration of the wireless communication system according to the present embodiment is the same as the wireless communication system according to the third embodiment shown in FIG. 6 except that the operation of the HSDPA operation state calculation unit 52 is partially different. Therefore, the description thereof is omitted.

The operation of the HSDPA operation state calculation unit 52 in the present embodiment is different from the third embodiment in that the flowchart shown in FIG. 7 is changed to FIG. Referring to FIG. 10, when the HSDPA operation state calculation unit 52 in this embodiment determines that the PBR has been received in step S11, the step S71 is executed, and in the case where the ST class is determined in step S43. The point that step S72 is performed is different from the third embodiment. That is, when the HSDPA operation state calculation unit 52 in the present embodiment is notified of the PBR from the transmission rate measurement unit 13 (step S11), the _UPBRperGBR that is the ratio of the transmission rate transmitted to the GBR _total is updated by the following equation. (Step S71).

U _PBRperGBR = PBR _st / GBR _total
In the present embodiment, when PBR _st or GBR _total is 0, _UPBRperGBR is not updated.

Further, in the present embodiment, the calculation formula of ABR _be in step S13 is not the GBR but the following formula using the PBR _st so as to consider the radio resources used by the ST class.

ABR _be = Max (PBR _be / U _pt −PBR _st , 0)
In addition, when there is an instruction to update parameters from the base station control unit 51 (step S14) and the QoS of the mobile station that newly starts using HSDPA or the mobile station that stops using HSDPA is ST class, The HSDPA operation state calculation unit 52 updates the parameters, but also updates PBR _st in addition to N _st , GBR _total , P _req, and ABR _be in the third embodiment (step S72).

The update formulas for N _st , GBR _total , and P _req are the same as in the third embodiment.

Update PBR _st with the following formula. It is assumed that the parameters before update are PBR _{st, old} and the parameters after update are PBR _{st, new} .

(When N _{st, new} is 0) PBR _{st, new} = 0
(When N _{st, new} is not 0) PBR _{st, new} = Max (PBR _{st, old} + _UPRBperGBR × (GBR _{total, new−} GBR _{total, old} ), 0)
Next, ABR _re is updated using the same formula as in step S13.

ABR _be = Max (PBR _be / U _pt −PBR _st , 0)
According to the present embodiment, when PBR _st is significantly smaller than GBR _total , ABR _be can be estimated more accurately than in the third embodiment, and as a result, more mobile stations using HSDPA can be estimated. Can accommodate more.

(Fifth embodiment)
Next, a wireless communication system according to a fifth embodiment of the present invention will be described.

  The configuration of the wireless communication system according to the present embodiment is the same as the wireless communication system according to the third embodiment shown in FIG. 6 except that the operation of the DCH restriction determination unit 54 is partially different. Therefore, the description thereof is omitted. The operation of the DCH restriction determination unit 54 in this embodiment is different from that of the third embodiment in that the flowchart shown in FIG. 9 is changed to FIG.

Referring to FIG. 11, the operation of the DCH restriction determination unit 54 in the fifth embodiment of the present invention is different from the third embodiment in that the processing after step S61 in FIG. 9 is changed. That is, when N _st is _greater than or equal to N _streqmin (step S61), the DCH restriction determination unit 54 determines that P _usable is less than the minimum power (P _req + P _reqmargin ) necessary for satisfying all GBR including the margin P _reqmargin. Is determined (step S63). If P _usable is less than the minimum power required to satisfy all _GBRs , the DCH restriction determination unit 54 controls the DCH of the DCH that is receiving data in the BE class to the base station control unit 21 to restrict the DCH. The rate is lowered to the lowest rate (step S81). The base station control unit 51 _selects up to N _{beDCH, ratedown} mobile stations from BE class mobile stations that are not at the lowest rate, and transitions to the lowest rate. For example, it is _assumed that the lowest rate is 8 kbps, N _{beDCH, ratedown} = 2, and the mobile stations are selected in order from the highest rate in order to maximize the amount of power reduction per mobile station. Now, if there are five mobile stations UE1 (64 kbps), UE2 (128 kbps), UE3 (8 kbps), UE4 (8 kbps), UE5 (384 kbps), two, ie, UE5 and UE2 are in descending order of rate. Each is selected and the rate is reduced to 8 kbps. The transmission rate is shown in parentheses ().

In order to regulate DCH, by lowering the BE class DCH rate to the lowest rate, the sum of DCH transmission power can be reduced, HSDPA allocated power can be increased, and P _usable can be increased.

  In the present embodiment, the DCH that performs data reception in the BE class is the target of regulation. However, the rate of the DCH that performs data reception in another QoS class, that is, the CS class may be reduced.

(Sixth embodiment)
Next, a radio communication system according to a sixth embodiment of this invention will be described.

  The configuration of the wireless communication system of the present embodiment is only partially different in operation in the DCH restriction determination unit 54 from the wireless communication system of the third embodiment shown in FIG. 6, that is, the fifth embodiment. Since the other points are the same, the description thereof is omitted. The operation of the DCH restriction determination unit 54 in this embodiment is different from that of the fifth embodiment in that the flowchart of the fifth embodiment shown in FIG. 11 is changed to FIG.

Referring to FIG. 12, the operation of the sixth embodiment of the present invention is different from that of the fifth embodiment in that step S81 in FIG. 11 is replaced with step S91. That is, when P _usable is less than the minimum power (P _req + P _reqmargin ) necessary for satisfying all GBR including the margin P _reqmargin (step S 63), the DCH restriction determination unit 54 restricts DCH. Therefore, the base station control unit 51 releases the DCH that is receiving data in the BE class (step S91). The base station control unit 51 _selects a maximum of N _{beDCH, release} mobile stations and releases the DCH. For example, the base station control unit 51 _selects N _{beDCH, release} = 1, and selects mobile stations in descending order of rate in order to maximize the amount of power reduction per mobile station. If there are three mobile stations UE11 (8 kbps), UE12 (128 kbps), and UE13 (64 kbps), one, that is, the DCH of UE12 is released in descending order of rate.

  According to the present embodiment, the amount of increase in the allocated power of HSDPA by regulating one mobile station as compared with the fifth embodiment by releasing the BE class DCH to regulate DCH. Is effective.

  In the present embodiment, the DCH that performs data reception in the BE class is the target of regulation, but the DCH that performs data reception in another QoS class, that is, the CS class may be released.

(Seventh embodiment)
Next, a radio communication system according to a seventh embodiment of this invention is described.

  The configuration of the wireless communication system according to the present embodiment is the same as the wireless communication system according to the third embodiment shown in FIG. 6 except that the operation of the DCH restriction determination unit 54 is partially different. Therefore, the description thereof is omitted. The operation of the DCH restriction determination unit 54 in the present embodiment is different from the third embodiment in that the flowchart of the third embodiment shown in FIG. 9 is changed to FIG.

  Referring to FIG. 13, the operation of the DCH restriction determination unit 54 in the present embodiment is different from the third embodiment in that step S81 is added after step S64 in FIG. Step S81 is the same process as the flowchart of FIG. 11 of the fifth embodiment.

  According to the present embodiment, the effect of increasing the allocated power of HSDPA is also increased by combining the third embodiment and the fifth embodiment as a DCH regulation method. Similarly, it is conceivable to combine the fourth to sixth embodiments.

  In the first to seventh embodiments, the case where the CS class that provides voice communication is accommodated by HSDPA is not described, but the CS class is a quality class that needs to guarantee the transmission rate. When the CS class is accommodated by HSDPA, it can be realized by a configuration and operation in accordance with the case of accommodating the ST class by HSDPA.

It is a block diagram which shows the structure of the radio | wireless communications system of the 1st Embodiment of this invention. It is a flowchart which shows the operation | movement of the base station control part 21 when there exists a utilization request | requirement of HSDPA from the mobile station of the 1st Embodiment of this invention. It is a flowchart which shows operation | movement of the HSDPA operation state calculation part 22 of the 1st Embodiment of this invention. It is a flowchart which shows operation | movement of the HSDPA utilization determination part 23 of the 1st Embodiment of this invention. It is a flowchart which shows operation | movement of the HSDPA utilization determination part 23 of the 2nd Embodiment of this invention. It is a block diagram which shows the structure of the radio | wireless communications system of the 3rd Embodiment of this invention. It is a flowchart which shows operation | movement of the HSDPA operation state calculation part 52 in the 3rd Embodiment of this invention. It is a flowchart which shows operation | movement of the HSDPA utilization determination part 53 in the 3rd Embodiment of this invention. It is a flowchart which shows operation | movement of the DCH regulation determination part 54 in the 3rd Embodiment of this invention. It is a flowchart which shows operation | movement of the HSDPA operation state calculation part 52 in the 4th Embodiment of this invention. It is a flowchart which shows operation | movement of the DCH regulation determination part 54 in the 5th Embodiment of this invention. It is a flowchart which shows operation | movement of the DCH regulation determination part 54 in the 6th Embodiment of this invention. It is a flowchart which shows operation | movement of the DCH regulation determination part 54 in the 7th Embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Base station 2 Base station control apparatus 11 Base station operation | movement part 12 Transmission power measurement part 13 Transmission rate measurement part 21 Base station control part 22 HSDPA operation state calculation part 23 HSDPA utilization determination part 24 DCH regulation determination part 31 Base station 32 Base station Control device 41 Base station operation unit 42 Transmission power measurement unit 43 Transmission rate measurement unit 44 Request power calculation unit 51 Base station control unit 52 HSDPA operation state calculation unit 53 HSDPA usage determination unit 54 DCH restriction determination unit S1 to S8, S11 to S15 , S21 to S24, S31, S41 to S44, S51 to S53, S61 to S65, S71 to S72, S81, S91 Steps

Claims (20)

A base station comprising means for transmitting data to a mobile station using a downlink shared channel and means for transmitting a signal to the mobile station using another downlink channel, and a base station controller for controlling the base station In a wireless communication system having
The base station
A transmission power measuring unit that measures transmission power of all channels being transmitted and transmission power other than the downlink shared channel;
A transmission rate measuring unit for measuring a transmission rate of the downlink shared channel,
The base station controller is
While measuring the number of mobile stations allowed to receive data transmitted using the downlink shared channel, the transmission rate measured by the transmission rate measuring unit, the transmission power of all channels, and the downlink shared channel A downlink shared channel operation state calculation unit for calculating a maximum transmission rate of the downlink shared channel when data is continuously transmitted with power that can be allocated to the downlink shared channel from transmission power other than
When there is a new downlink shared channel usage request from a mobile station, based on the maximum transmission rate and the number of mobile stations, per mobile user when the mobile station is permitted to use the downlink shared channel The maximum transmission rate is calculated, and when the maximum transmission rate per user is greater than a predetermined threshold, the downlink shared channel use request is permitted, and when the maximum transmission rate is less than the threshold, the use request is rejected. A wireless communication system comprising: a channel use determination unit.   The downlink shared channel usage determining unit rejects the usage request when a value obtained by adding 1 to the mobile station is greater than or equal to a predetermined number when there is a new downlink shared channel usage request from the mobile station. The wireless communication system according to claim 1. A base station comprising means for transmitting data to a mobile station using a downlink shared channel and means for transmitting a signal to the mobile station using another downlink channel, and a base station controller for controlling the base station In a wireless communication system having
The base station
A transmission power measuring unit that measures transmission power of all channels being transmitted and transmission power other than the downlink shared channel;
A transmission rate measuring unit that measures the transmission rate of data of a quality class in which the transmission rate in the downlink shared channel is not guaranteed,
The base station controller is
The number of mobile stations that are allowed to receive data whose transmission rate is not guaranteed among mobile stations that are permitted to receive data transmitted using the downlink shared channel is measured by the transmission rate measuring unit. The downlink sharing when data is continuously transmitted from the transmission rate, the transmission power of all the channels, and the transmission power other than the downlink sharing channel with the power that can be allocated to the downlink sharing channel. A downlink shared channel operation state calculation unit for calculating a maximum transmission rate of data for which a transfer rate in the channel is not guaranteed and calculating a total value of guaranteed transmission rates for data transmission in which the transmission rate in the downlink shared channel is guaranteed;
When there is a request for use of a new downlink shared channel from the mobile station, based on the maximum transmission rate of data for which the transmission rate is not guaranteed, the number of mobile stations, and the total value of the guaranteed transmission rate, When the use of the downlink shared channel is permitted, the maximum transmission rate per user for which the transmission rate is not guaranteed is calculated, and when the maximum transmission rate per user is larger than a predetermined threshold, the use request of the downlink shared channel is calculated. And a downlink shared channel use determination unit that permits the use request and rejects the use request when the value is equal to or less than the threshold value. A base station comprising means for transmitting data to a mobile station using a downlink shared channel and means for transmitting a signal to the mobile station using another downlink channel, and a base station controller for controlling the base station In a wireless communication system having
The base station
A transmission power measuring unit that measures transmission power of all channels being transmitted and transmission power other than the downlink shared channel;
A transmission rate measuring unit for measuring a transmission rate of data of a quality class whose transmission rate in the downlink shared channel is not guaranteed and a transmission rate of data of a quality class whose transmission rate is not guaranteed;
The base station controller is
Measures the number of mobile stations allowed to receive data whose transmission rate is not guaranteed among mobile stations allowed to receive data transmitted using the downlink shared channel, and measured by the transmission rate measuring unit The data is continuously transmitted with the power that can be allocated to the downlink shared channel from the transmission rate of the data for which the transmission rate is not guaranteed, the transmission power of all the channels, and the transmission power other than the downlink shared channel. A downlink shared channel operation state calculation unit for calculating a maximum transmission rate of data for which a transfer rate in the downlink shared channel is not guaranteed when transmitting
When there is a request to use a new downlink shared channel from the mobile station, based on the maximum transmission rate, the number of mobile stations, and the transmission rate of data for which the transmission rate is guaranteed, the mobile station When the use of the downlink shared channel is permitted, the maximum transmission rate per user for which the transmission rate is not guaranteed is calculated, and when the maximum transmission rate per user is greater than a predetermined threshold, a request for using the downlink shared channel is issued. A wireless communication system comprising: a downlink shared channel use determination unit that permits and rejects a use request when the threshold value is not more than a threshold value.   The downlink shared channel operation state calculation unit updates the maximum transmission rate according to an increase or decrease in the number of mobile stations allowed to receive data for which the transmission rate is not guaranteed. Wireless communication system. A base station comprising means for transmitting data to a mobile station using a downlink shared channel and means for transmitting a signal to the mobile station using a downlink dedicated channel; and a base station controller for controlling the base station; In a wireless communication system having
The base station
A base station operating unit that calculates a total value of guaranteed transmission rates of data transmissions with guaranteed transmission rates in the downlink shared channel;
A transmission power measuring unit that measures transmission power of all channels being transmitted, transmission power other than the downlink shared channel, and transmission power of data with a guaranteed transmission rate in the downlink shared channel;
A transmission rate measuring unit for measuring a transmission rate of data of a quality class whose transmission rate in the downlink shared channel is not guaranteed;
Necessary for the downlink shared channel to satisfy the total value of the guaranteed transmission rates from the transmission rate of the data for which the transmission rate is guaranteed and the transmission power of the data for which the transmission rate is guaranteed in the downlink shared channel. A required power calculation unit for calculating power,
The base station controller is
The number of mobile stations that are allowed to receive data whose transmission rate is not guaranteed among mobile stations that are permitted to receive data transmitted using the downlink shared channel is measured by the transmission rate measuring unit. A downlink shared channel operation state calculator that calculates power that can be allocated to the downlink shared channel from the transmission rate, the transmission power of all the channels, and the transmission power other than the downlink shared channel;
A radio having a dedicated channel restriction determination unit that regulates use of the downlink dedicated channel when power that can be allocated to the downlink shared channel is less than power required for the downlink shared channel Communications system.   The dedicated channel restriction determination unit restricts establishment of the downlink dedicated channel and lowers the predetermined threshold when a cell load expected by establishment of the downlink dedicated channel is higher than a predetermined threshold. The wireless communication system according to claim 6, wherein the use of the downlink dedicated channel is regulated by:   The radio communication system according to claim 6, wherein the dedicated channel restriction determination unit regulates use of the downlink dedicated channel by lowering a transmission rate of the downlink dedicated channel.   The wireless communication system according to claim 6, wherein the dedicated channel restriction determination unit restricts use of the downlink dedicated channel by releasing the downlink dedicated channel.   The wireless communication system according to claim 6, wherein the downlink shared channel operation state calculation unit updates the necessary power according to an increase or decrease in the number of mobile stations in a state where the data with a guaranteed transmission rate can be received. A base station comprising means for transmitting data to a mobile station using a downlink shared channel and means for transmitting a signal to the mobile station using a downlink dedicated channel; and a base station controller for controlling the base station; A wireless network control method in a wireless communication system comprising:
Measuring transmission power of all channels transmitted by the base station and transmission power other than the downlink shared channel;
Measuring a transmission rate of the downlink shared channel;
Measures the number of mobile stations allowed to receive data transmitted using the downlink shared channel, measures the transmission rate of the downlink shared channel, the transmission power of all channels, and other than the downlink shared channel Calculating a maximum transmission rate of the downlink shared channel when data is continuously transmitted with power that can be allocated to the downlink shared channel from the transmission power of
When there is a new downlink shared channel usage request from a mobile station, based on the maximum transmission rate and the number of mobile stations, per mobile user when the mobile station is permitted to use the downlink shared channel Calculating a maximum transmission rate;
A wireless network control comprising: permitting a downlink shared channel use request if the maximum transmission rate per user is greater than a predetermined threshold; rejecting the use request if the maximum transmission rate is less than the threshold; Method.   In the step of determining permission or rejection of the downlink shared channel use request, when there is a new downlink shared channel use request from the mobile station, the value obtained by adding 1 to the mobile station is a predetermined number or more. The wireless network control method according to claim 11, wherein the use request is rejected. A base station comprising means for transmitting data to a mobile station using a downlink shared channel and means for transmitting a signal to the mobile station using a downlink dedicated channel; and a base station controller for controlling the base station; A wireless network control method in a wireless communication system comprising:
Measuring transmission power of all channels transmitted by the base station and transmission power other than the downlink shared channel;
Measuring a transmission rate of data of a quality class whose transmission rate in the downlink shared channel is not guaranteed;
Measures the number of mobile stations that are allowed to receive data whose transmission rate is not guaranteed among mobile stations that are allowed to receive data transmitted using the downlink shared channel, and the measured downlink shared channel The downlink sharing in the case where data is continuously transmitted with the power that can be allocated to the downlink shared channel from the transmission rate of all channels, the transmission power of all the channels, and the transmission power other than the downlink shared channel Calculating a maximum transmission rate of data for which a transfer rate in the channel is not guaranteed;
Calculating a total value of guaranteed transmission rates of data transmission with guaranteed transmission rates in the downlink shared channel;
When there is a request for use of a new downlink shared channel from the mobile station, based on the maximum transmission rate of data for which the transmission rate is not guaranteed, the number of mobile stations, and the total value of the guaranteed transmission rate, Calculating a maximum transmission rate per user whose transmission rate is not guaranteed when the use of the downlink shared channel is permitted,
A wireless network control comprising: permitting a downlink shared channel use request if the maximum transmission rate per user is greater than a predetermined threshold; rejecting the use request if the maximum transmission rate is less than the threshold; Method. A base station comprising means for transmitting data to a mobile station using a downlink shared channel and means for transmitting a signal to the mobile station using a downlink dedicated channel; and a base station controller for controlling the base station; A wireless network control method in a wireless communication system comprising:
Measuring transmission power of all channels transmitted by the base station and transmission power other than the downlink shared channel;
Measuring the transmission rate of quality class data for which the transmission rate in the downlink shared channel is not guaranteed and the transmission rate of quality class data for which the transmission rate is not guaranteed;
Measuring the number of mobile stations that are allowed to receive data whose transmission rate is not guaranteed among mobile stations that are allowed to receive data transmitted using the downlink shared channel;
Continuously with the power that can be allocated to the downlink shared channel from the transmission rate of the data for which the measured transmission rate is not guaranteed, the transmission power of all the channels, and the transmission power other than the downlink shared channel Calculating a maximum transmission rate of data for which a transfer rate in the downlink shared channel is not guaranteed when data is transmitted to
When there is a request to use a new downlink shared channel from the mobile station, based on the maximum transmission rate, the number of mobile stations, and the transmission rate of data for which the transmission rate is guaranteed, the mobile station Calculating a maximum transmission rate per user whose transmission rate is not guaranteed when the use of the downlink shared channel is permitted;
A wireless network control comprising: permitting a downlink shared channel use request if the maximum transmission rate per user is greater than a predetermined threshold; rejecting the use request if the maximum transmission rate is less than the threshold; Method.   In the step of calculating the maximum transmission rate of data whose transfer rate is not guaranteed in the downlink shared channel, the maximum transmission rate is updated according to an increase or decrease in the number of mobile stations permitted to receive data whose transmission rate is not guaranteed. The radio network control method according to claim 12. A base station comprising means for transmitting data to a mobile station using a downlink shared channel and means for transmitting a signal to the mobile station using a downlink dedicated channel; and a base station controller for controlling the base station; A wireless network control method in a wireless communication system comprising:
Measuring transmission power of all channels transmitted by the base station, transmission power other than the downlink shared channel, and transmission power of data with a guaranteed transmission rate in the downlink shared channel;
Measuring a transmission rate of data of a quality class whose transmission rate in the downlink shared channel is not guaranteed;
Measuring the number of mobile stations that are allowed to receive data whose transmission rate is not guaranteed among mobile stations that are allowed to receive data transmitted using the downlink shared channel;
Power that can be allocated to the downlink shared channel from the transmission rate of the quality class data for which the measured transmission rate is not guaranteed, the transmission power of all the channels, and the transmission power other than the downlink shared channel A step of calculating
Calculating a total value of guaranteed transmission rates of data transmission with guaranteed transmission rates in the downlink shared channel;
Necessary for the downlink shared channel to satisfy the total value of the guaranteed transmission rates from the transmission rate of the data for which the transmission rate is guaranteed and the transmission power of the data for which the transmission rate is guaranteed in the downlink shared channel. Calculating power,
And a step of restricting use of the downlink dedicated channel when power that can be allocated to the downlink shared channel is less than power required for the downlink shared channel. If the cell load expected by the establishment of the downlink dedicated channel is higher than a predetermined threshold, the step of regulating the establishment of the downlink dedicated channel,
The radio network control method according to claim 16, wherein in the step of restricting use of the downlink dedicated channel, the use of the downlink dedicated channel is restricted by lowering the predetermined threshold.   The radio network control method according to claim 6, wherein the step of restricting use of the downlink dedicated channel is a step of lowering a transmission rate of the downlink dedicated channel.   The radio network control method according to claim 16, wherein the step of restricting use of the downlink dedicated channel is a step of releasing the downlink dedicated channel.   17. The radio network control method according to claim 16, wherein in the step of calculating the necessary power, the necessary power is updated according to an increase or decrease in the number of mobile stations in a state where the data with a guaranteed transmission rate can be received.

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