JP4074476B2 - Transmission power control method and radio control apparatus during soft handover - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a transmission power control method and radio control apparatus during soft handover, and more particularly to a transmission power control method for a downlink shared channel in a mobile packet communication system.
[0002]
The present invention also relates to a radio control apparatus capable of controlling the transmission power of the downlink shared channel according to such a transmission power control method.
[0003]
[Prior art]
With the recent development of Internet-related technologies, it has become possible to provide various services such as music distribution over the Internet. In such a service, the amount of downlink transmission is very large. In 3GPP (3rd Generation Partnership Project), which examines international standards for third generation mobile communication systems, in order to realize services with a large amount of downlink transmission, one downlink packet access method is provided. A downlink shadow channel (DSCH: Downlink Shared Channel, hereinafter abbreviated as DSCH) in which a channel is shared by a plurality of mobile stations is employed. FIG. 11 is a diagram for explaining a conventional technique when packet transmission is performed using DSCH in a mobile packet communication system. As shown in the figure, in the downlink (also referred to as a downlink from the base station A310 to the mobile station A410), a DSCH (thick line) for transmitting data addressed to the mobile station A410 and the DSCH are attached. Then, two radios of a physical channel A-DPCH (A-DPCH: Associated-Dedicated Physical Channel (dotted line), hereinafter abbreviated as ADCH in this example) for exchanging radio control information with the mobile station A410. The channels are used separately, and in the uplink (which is also referred to as the uplink from the mobile station A410 to the base station A310), data from the mobile station A410 and control information are one physical channel. (DCH: Dedicated Control Channel (solid line), hereinafter abbreviated as DCH) and multiplexed with the base station A310. Since the ADCH in the downlink transmits only a control signal, the channel speed is set to a relatively low speed, and the DCH in the uplink transmits both the control signal and user data, so The high line speed is set. As for DSCH, a higher line speed is set as compared with ADCH so that high-speed data communication can be performed.
[0004]
In order to perform packet communication using the DSCH set for such a downlink, the base station first notifies the mobile station that transmission by DSCH is started in a radio frame before data transmission. Then, the mobile station that has received this notification starts receiving DSCH from the base station. The base station notifies the plurality of mobile stations of DSCH transmission through the ADCH and transmits user data through the DSCH, thereby transmitting the data of the plurality of users in a time multiplexed manner. In the case of FIG. 11 described above, one downlink ADCH and one DSCH from the base station A310 are set, but the DSCH is not always set, and the DSCH is set only when notified by the DCH. Is done.
[0005]
Furthermore, in the prior art, in order to improve the channel quality of ADCH and DCH, it is called diversity reception (generally, Soft Handover (SHO) or Diversity Handover (DHO)). A technique called “DHO”) is applied. FIG. 12 is a diagram showing a channel configuration example in the mobile packet communication system when this DHO technology is applied to the conventional technology shown in FIG. In the figure, in the downlink, mobile station A 410 transmits from a plurality of base stations (in this case, base stations A 310 and B) in a predetermined area near the boundary between cells formed by base station A 310 and base station B 320. Receive ADCH. The uplink DCH is received by a plurality of base stations (in this case, base stations A 310 and B). At this time, regarding the DSCH, since a plurality of user data are time-multiplexed, it is difficult to control the data transmission timing. Therefore, in DSCH transmission, DHO is not applied, and transmission is performed only from one base station (cell) in Active Set (a radio link established between the mobile station and the network).
[0006]
Now, in a mobile packet communication system that configures a channel using a code, such as CDMA (Code Division Multiple Access), which is one of the radio access methods, from the viewpoint that a reduction in system capacity can be prevented. Transmission power control is an important elemental technology. For example, in a W-CDMA system adopted in IMT-2000 (International Mobile Telecommunications 2000) formulated by the ITU (International Telecommunication Union), a technique called high-speed transmission power control is applied. FIG. 13 is a diagram for explaining the operation of transmission power control at the time of packet transmission (packet transmission using DSCH) in this W-CDMA system. In FIG. 13, the mobile station A410 calculates (measures) the signal power to interference power ratio (hereinafter abbreviated as SIR) of ADCH transmitted from the base station A310, and the result and a predetermined target value (= The target value). If the comparison shows that it is lower than the target value, a transmission power command is transmitted on the DCH so as to increase the transmission power of the ADCH to the base station A310. On the other hand, if the SCH of ADCH is larger than the target value, a transmission power command is transmitted on DCH so as to reduce the transmission power of ADCH (steps (1) to (4) in the figure).
[0007]
In addition, the base station A310 calculates (measures) the SIR of the DCH, compares the predetermined target value (target value) with the SIR of the DCH, similarly to the mobile station A410, and transmits a transmission power control command using the ADCH. Is transmitted (steps (5) to (8) in the figure). In this way, the mobile station A410 and the base station A310 operate so as to adjust each other's transmission power and always maintain the optimum transmission power. The DSCH transmission power is controlled based on a value obtained by multiplying the ADCH transmission power value by a predetermined value (offset value). It is considered that the transmission power of ADCH is always optimally controlled based on the transmission power control command transmitted from mobile station A410, and since ADCH and DSCH are transmitted simultaneously, the base station and the mobile station Since the wireless channel state between them can be regarded as the same for ADCH and DSCH, this is the control method. The offset value is notified from the radio network control measure for controlling a plurality of base stations to the corresponding base station.
[0008]
FIG. 14 is a diagram showing the operation of transmission power control when DHO is applied to the prior art shown in FIG. In this figure, during DHO, the mobile station A410 receives and combines the ADCHs transmitted from the base stations A310 and B, calculates (measures) the SIR, and the result and a predetermined target value (= target). Value). Then, a transmission power control command is generated based on the comparison result and transmitted to the command base stations A 310 and B via the DCH (steps (1) to (4) in the figure). In addition, the base station A310 calculates (measures) the SIR of the DCH, compares the predetermined target value (target value) with the SIR of the DCH, similarly to the mobile station A410, and transmits a transmission power control command using the ADCH. Is transmitted (steps (5) to (8) in the figure).
[0009]
In such a conventional transmission power control operation during DHO, the mobile station A410 receives and synthesizes the ADCHs transmitted from the base stations A310 and B, determines the SIR, and performs transmission power control. For example, the base station B320 When the received power of the incoming signal is superior to the received power of the signal coming from the base station A310, the power control command transmitted by the mobile station A410 on the DCH is mainly the radio between the base station B320 and the mobile station A410. The link quality is emitted, and an error occurs in the transmission power control of the DSCH transmitted from only the base station A310, so that the quality of the DSCH cannot be kept constant. In order to cope with this problem, application of SSDT (Site Selection Diversity Transmission) which is a transmission diversity technique at the time of DHO is considered. In SSDT, a mobile station in DHO measures the reception power of CPICH in each cell, determines one base station that gives the highest reception power as “primary”, and controls an uplink control signal (SSDT signal) By reporting to each base station using, it is possible to prevent an increase in the amount of downlink interference by using a technique in which the downlink is transmitted only from the primary base station. Note that base stations other than the primary (reception power is not high) are classified as “non-primary”.
[0010]
3GPP TR25.841 describes a method of controlling the transmission power of DSCH using the above-mentioned SSDT technology during DHO. This describes a method of switching the DSCH transmission power offset between the primary base station determined based on the SSDT signal notified from the mobile station and the non-primary base station. In other words, the base station is the primary base station. The transmission power offset value is switched depending on whether or not the transmission power of the DSCH is controlled. Further, the result of evaluating the offset switching gain of the above method is shown in the following document.
[0011]
Literature: Hanaki et al. “Study of DSCH power offset control method in Soft Handover area in W-CDMA DSCH” 2002 IEICE General Conference B-5-136.
[0012]
[Problems to be solved by the invention]
However, in the conventional mobile packet communication system as described above, the DSCH is always performed without considering the positional relationship between the mobile station in DHO and the base station transmitting the ADCH to the mobile station. Transmission power control is performed with a fixed primary transmission power offset and non-primary transmission power offset. For this reason, there has been a problem that the DSCH does not satisfy the required quality, or the quality becomes excessive and the system capacity of the base station is reduced.
[0013]
The present invention has been made in view of the above problems, and the problem is to provide a DSCH transmission power control method capable of preventing deterioration of DSCH quality during DHO. is there.
[0014]
It is another object of the present invention to provide a radio control apparatus capable of performing DSCH transmission power control according to such a transmission power control method.
[0015]
[Means for Solving the Problems]
In order to solve the above problems, the present invention According to Transmission power for controlling the transmission power offset of the downlink packet common channel transmitted from the base station selected by the mobile station at the time of soft handover in which the mobile station in the mobile packet communication system is simultaneously connected to a plurality of base stations In the control method, the transmission power offset of the downlink packet common channel is controlled based on a relationship between a combination of downlink radio channel qualities of the base stations and a communication rate of the downlink packet common channel. It is a feature.
[0016]
Book According to the invention, in the transmission power control method, a difference in downlink radio channel quality between base stations extracted according to a combination of downlink radio channel qualities of each base station is obtained, and the obtained difference and the downlink packet The transmission power offset of the downlink packet common channel is controlled based on the relationship with the communication rate of the common channel for use.
[0017]
Book According to the invention, in the transmission power control method, a difference in downlink radio channel quality of each base station is obtained, and based on the relationship between the obtained difference and the communication rate of the downlink packet common channel, the downlink power channel quality difference is obtained. The transmission power offset of the common channel for link packets is controlled.
[0018]
Book According to the invention, in the transmission power control method, using the downlink radio channel quality of the base station extracted according to the combination of downlink radio channel qualities of each base station, the characteristics of the downlink radio channel quality are obtained, The transmission power offset of the downlink packet common channel is controlled based on the relationship between the obtained characteristics of downlink radio channel quality and the communication rate of the downlink packet common channel.
[0019]
Book According to the present invention, the quality of the downlink radio channel is obtained from the received power intensity of a pilot signal transmitted from each base station.
[0020]
A radio control apparatus capable of performing transmission power control according to the transmission power control method is as follows. , Transfer Radio control apparatus for controlling transmission power offset of common channel for downlink packet transmitted from base station selected by mobile station in soft handover in which mobile station in mobile packet communication system is simultaneously connected to a plurality of base stations A downlink radio channel quality storage means for holding a combination of downlink radio channel qualities of each base station, a communication rate storage means for acquiring and holding information on a communication rate of the downlink packet common channel, and the downlink Based on the relationship between the combination of the downlink radio channel quality of the corresponding base station held by the radio channel quality storage means and the communication rate of the downlink packet common channel held by the communication rate storage means, Offset to determine the transmission power offset of the common channel for downlink packets It is characterized in that a determining means.
[0021]
Book According to the invention, in the radio control apparatus, the downlink radio channel quality storage means obtains a difference in downlink radio channel quality between base stations extracted according to a combination of downlink radio channel qualities of the base stations, and It is characterized by storing the obtained difference value.
[0022]
Book According to the invention, in the radio control apparatus, the downlink radio channel quality storage means obtains a difference in downlink radio channel quality between the base stations and stores the obtained difference value.
[0023]
Book According to the invention, in the radio control apparatus, the downlink radio channel quality storage means uses the downlink radio channel quality of the base station extracted according to a combination of downlink radio channel qualities of the base stations, and uses the downlink radio channel quality. The feature is that the characteristics of the channel quality are obtained and the obtained characteristics of the downlink radio channel quality are stored.
[0024]
Book According to the invention, in the radio control apparatus, the downlink radio channel quality storage means uses the received power intensity of a pilot signal transmitted from the base station as the downlink radio channel quality of the base station.
[0025]
Book According to the invention, in the radio control apparatus, the offset determining means determines the transmission power offset of the downlink packet common channel of the downlink radio channel quality of the corresponding base station stored in the downlink radio channel quality storage means. An offset setting table registered in association with a combination and a communication rate of the downlink packet common channel stored by the communication rate storage means, and the downlink for the corresponding base station by referring to the offset setting table The transmission power offset of the common channel for packets is determined.
[0026]
According to the present invention, based on the relationship between the combination of pilot signal reception strength from each base station transmitting a control signal addressed to a mobile station and the communication rate of the downlink packet common channel, Since the transmission power offset of the common channel is obtained, the obtained offset value reflects the current distance between the base station and the mobile station and the power relationship. That is, since the transmission power offset for the DSCH is obtained in a state in which the radio wave environment around the base station and the mobile station is accurately grasped, the transmission power control error of the DSCH can be reduced even during the DHO, DSCH quality deterioration can be prevented
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0027]
FIG. 1 is a diagram illustrating a configuration example of a mobile packet communication system to which a transmission power control method of the present invention is applied.
[0028]
In FIG. 1, the mobile packet communication system includes a switching apparatus 100, a radio network controller 200, and base station apparatuses A310 to C330 (hereinafter referred to as base stations) that are arranged in a hierarchy. The mobile station A 410 communicates with the base station A 310 and the mobile station B 420 communicates with the base station B 320 via a wireless line. Further, the mobile station A410 receives signals from the base station A310 and the base station 2 in the DHO area. Radio control apparatus 200 issues instructions for adding and deleting DHO branches to base stations A 310 to C 330 in consideration of the transmission power offset value for DSCH, the moving speed of the mobile station, and the effects of fading. The control device controls and controls a plurality of base stations (in this example, base stations A310 to C330).
[0029]
FIG. 2 is a diagram showing functional blocks of the radio network controller 200 in the mobile packet communication system shown in FIG. In FIG. 2, the radio network controller 200 is provided with a user data buffer 11 for temporarily storing information addressed to the mobile station user coming from the switching apparatus 100 on the trunk network side, and stored in the user data buffer. The data is output to the queuing processing unit 12. The queuing processing unit 12 controls the data transmission order when transferring user data to be output to the base station. For example, the order of data transmission to the base station is controlled based on a FIFO (First In First Out) queuing method, a priority (priority) queuing method, and the like. In response to the DHO branch addition / deletion request from the mobile station, the DHO control unit 14 controls the base station to set the DHO branch (instruct the base station to add / delete the DHO branch), and the storage unit 15 Then, information on the downlink radio quality (specifically, pilot signal received power intensity) of the communicating base station that is reported from the mobile station periodically or in response to a report request from the radio control unit 16 is stored. The offset calculation unit 13 obtains the DSCH transmission power offset, that is, the primary transmission power offset and the non-primary transmission power offset, using the information stored in the storage unit 15, and notifies the base station of the results. In the base station, the primary transmission power offset or the non-primary transmission power offset notified from the radio network controller is applied to the DSCH transmission power for transmission.
[0030]
FIG. 3 is a diagram showing items of the reference table and information stored in the storage unit 15 in the radio network controller 200 shown in FIG. As shown in the figure, the storage unit 15 includes (1) a combination of pilot signal received power for each mobile station (including DSCH communication rate information).
(3) Offset setting table
Is accumulated. In (1) above, the combination of the received power intensity of pilot signals transmitted from a plurality of base stations in the Active Set and the communication rate of DSCH transmitted from the base station that is the DSCH transmitting station are different for each mobile station. Managed. Here, a combination of pilot signal received power strengths of a plurality of base stations (all cells) in the Active Set will be described.
[0031]
The pilot signal reception power strength of all cells of the Active Set reported from the mobile station is first classified according to a predefined classification table. FIG. 5 is an example of a pilot signal received power classification table used for this classification. As shown in the table, the pilot signal reception power strength of all cells of the Active Set is classified into four levels (four levels A to D) according to the power level. For example, when the number of Active Sets is 8, a combination of “AABDDCBC” is obtained as the pilot signal reception power intensity after classification as shown in FIG. Similarly to the above, the DSCH communication rate is also classified into four stages of 64 kbps, 128 kbps, 256 kbps, and 384 kbps (four stages A to D) (see FIG. 6). In (2) above, the primary transmission power offset value and the non-primary transmission power offset value obtained in association with the above (1) are registered in a predetermined table. In this example, this table is called an offset setting table.
[0032]
Next, the processing procedure for determining the transmission power offset in the offset calculation unit 13 will be described with reference to the flowchart of FIG.
[0033]
In FIG. 4, when the offset calculation unit 13 receives a notification of a transmission target user ID from the queuing processing unit 12 (S1), the offset calculation unit 13 sets the mobile station corresponding to the user ID (here, “090xx”). A combination of pilot signal reception power strengths (in this example, it is assumed that a combination called AABDDCBC shown in FIG. 7 is obtained) and the classified DSCH communication rates are acquired from the storage unit 15 (S2). As described above, the pilot signal reception power strength of all cells of the Active Set reported from the mobile station is classified into four stages, and the DSCH communication rate is classified into four stages. Here, assuming that the number of Active Sets is 8, the offset setting table has 4 × 4 × 8 = 128 setting values. When the offset calculation unit 13 obtains the combination (1) of the pilot signal reception power strength and the communication rate (2) of the DSCH, the offset calculation unit 13 refers to the offset setting table (S3) and applies the corresponding DSCH transmission power. Find the offset value. FIG. 8 is a diagram illustrating an example of an offset setting table referred to by the offset calculation unit 13. For example, when the combination of pilot signal reception power strengths reported from the mobile station is “AABDDCBC” and the DSCH communication rate class is A, primary offset A1 dB and non-primary offset A2 dB are obtained as DSCH transmission power offset values ( Arrow). In the table, the “No” column indicates a setting number from 1 to 128, and the “Combination of pilot signal received power strength in Active Set” column indicates the received power strength after classification. The DSCH communication rate after classification is shown in the “DSCH communication rate class” column, and the registered primary offset and non-primary offset values are shown in the “transmission power offset value” column. Indicated. The offset calculation unit 13 notifies the base station and the mobile station of the DSCH transmission power offset value obtained as described above (S4).
[0034]
Now, normally, when the distance between the base station and the mobile station is constant, high transmission power is required for the high-speed packet channel, but low transmission power is required for the low-speed packet channel. On the other hand, when the transmission rate of the packet channel is constant, high transmission power is required if the distance between the base station and the mobile station is long, but only low transmission power is required if the distance is short. In the present invention, by using the combination of the pilot signal reception strength of the base station in the Active Set and the communication rate indicating the speed of the DSCH, the distance and the power relationship between the base station and the mobile station are grasped, The greatest feature is to control the transmission power offset for the DSCH based on the result.
[0035]
Therefore, the transmission power offset for the DSCH obtained as described above reflects the distance and power relationship between the base station and the mobile station at the present time, and accurately grasps the radio wave environment around the base station and the mobile station. Control of transmission power offset for DSCH in the state can be realized. As a result, transmission error control error of DSCH can be reduced even during DHO, and quality degradation of DSCH can be prevented.
[0036]
In addition, the above-mentioned embodiment is an example of suitable implementation of this invention, and is not limited to this. Various modifications can be made without departing from the scope of the present invention. For example, a combination of pilot signal received power strengths of all cells of the Active Set may be obtained by the following procedure.
[0037]
(Modification 1 of embodiment)
When the offset calculation unit 13 acquires the pilot signal reception strength (eg, n = 3) of the base station in the Active Set from the storage unit, the offset calculation unit 13 extracts r from the acquired n pilot signal reception strengths. Z combinations of pilot signal reception strengths (for example, Z = _n C _r = ₃ C ₂ = 3) The DSCH transmission power offset value calculated and registered in association with the combination of the extracted pilot signal reception strengths of the extracted z groups and the DSCH communication rate is obtained with reference to the offset setting table. . Here, the obtained primary transmission power offset value and non-primary transmission power offset value (= DSCH transmission power offset value) are compared with, for example, a DSCH transmission power offset value obtained for z sets and a predetermined threshold. A DSCH transmission power offset value based on the comparison result is selected. FIG. 9 is a diagram showing a concept of storing the pilot signal reception power and DSCH communication rate of all cells of the active set accumulated in the storage unit 15 in the first modification of the above embodiment, and FIG. It is a figure which shows the DSCH transmission power offset value registered in association with one combination of pilot signal reception power of all cells and the DSCH communication rate. In the example of FIG. 10, the DSCH transmission power offset value (“A1 dB” as the primary offset value is a non-primary offset value based on the combination of XX and YY and the DSCH communication rate class A among z sets of pilot signal received power. "A2dB") is registered as an example.
[0038]
(Modification 2 of embodiment)
Further, a mode may be adopted in which a difference in pilot signal reception strength of the base station in the Active Set is taken and a transmission power offset is obtained based on the relationship between the difference and the DSCH communication rate. Further, a mode may be adopted in which a difference in pilot signal reception intensity extracted by the above combination is obtained, and a transmission power offset is obtained from the relationship between the difference value and the DSCH communication rate. Further, a value indicating the characteristic of the pilot signal reception power is obtained from the pilot signal reception intensity extracted by the above combination, and the transmission power offset is obtained from the relationship between the characteristic value and the DSCH communication rate. Good.
[0039]
In the above example, the storage management function of the storage unit 15 of the radio network controller 200 corresponds to the downlink radio channel quality storage unit and the communication rate storage unit, and the transmission power offset calculation function of the offset calculation unit corresponds to the offset determination unit.
[0040]
【The invention's effect】
As described above, according to the present invention, the transmission power offset for the DSCH is obtained based on the relationship between the combination of the pilot signal reception strengths of the base stations in the Active Set and the communication rate of the DSCH. The obtained offset value reflects the distance and power relationship between the base station and the mobile station at the present time. That is, since the transmission power offset for the DSCH is obtained in a state in which the radio wave environment around the base station and the mobile station is accurately grasped, the transmission power control error of the DSCH can be reduced even during the DHO, DSCH quality deterioration can be prevented.
[Brief description of the drawings]
FIG. 1 is a diagram showing a configuration example of a mobile packet communication system to which a transmission power control method of the present invention is applied.
2 is a functional block diagram of a radio network controller in the mobile packet communication system shown in FIG.
3 is a diagram showing items of a reference table and information stored in a storage unit in the radio network controller shown in FIG. 2;
FIG. 4 is a flowchart showing a processing procedure for determining a transmission power offset in an offset calculation unit.
FIG. 5 is a diagram showing a pilot signal received power classification table;
FIG. 6 is a diagram showing a DSCH communication rate classification table.
FIG. 7 is a diagram illustrating a combination example of pilot signal received power for each mobile station accumulated in a storage unit;
FIG. 8 is a diagram illustrating an example (part 1) of an offset setting table;
FIG. 9 is a diagram illustrating a concept of accumulation of pilot signal reception power and DSCH communication rate of all cells of Active set accumulated in a storage unit;
FIG. 10 is a diagram illustrating an example (part 2) of an offset setting table.
FIG. 11 is a diagram for explaining a conventional technique when packet transmission is performed using DSCH in a mobile packet communication system.
12 is a diagram showing a channel configuration example in a mobile packet communication system when this DHO technology is applied to the conventional technology shown in FIG.
FIG. 13 is a diagram for explaining an operation of transmission power control during packet transmission in a W-CDMA system.
14 is a diagram showing an operation of transmission power control when DHO is applied to the prior art shown in FIG.
[Explanation of symbols]
11 User data buffer
12 Queuing processing part
13 Offset calculator
14 DHO controller
15 Storage unit
16 Wireless controller
100 switching equipment
200 Radio control device
310 Base station A
320 Base station B
330 Base station C
410 Mobile station A
420 Mobile station B

Claims (6)

At the time of soft handover in which a mobile station in a mobile packet communication system is simultaneously connected to a plurality of base stations, a transmission power offset of a channel transmitted from the base station selected by the mobile station and shared by the plurality of mobile stations is controlled. In the transmission power control method,
The received power strength of pilot signals of all cells in the radio link established between the mobile station and the network reported from the mobile station is classified according to the power strength,
Classifying communication rates of channels shared by the plurality of mobile stations;
Based on the relationship between the combination of the received power strength classes of pilot signals of all cells in the radio link and the class of the channel communication rate shared by the plurality of mobile stations, it is shared by the plurality of mobile stations. A transmission power control method characterized by controlling a transmission power offset of a channel to be transmitted. The transmission power control method according to claim 1,
The combination of the received power strength of the pilot signal extracted from the received power strength of the pilot signal of all cells in the radio link established between the mobile station and the network reported from the mobile station, and shared by the plurality of mobile stations A transmission power control method for controlling a transmission power offset of a channel shared by the plurality of mobile stations based on a relationship with a communication rate class of a channel . The transmission power control method according to claim 1 or 2 ,
Controlling a transmission power offset for a primary base station having the highest received power of a pilot signal of each cell measured by a mobile station in diversity handover, and a transmission power offset for a non-primary base station other than the primary base station A transmission power control method characterized by the above. At the time of soft handover in which a mobile station in a mobile packet communication system is simultaneously connected to a plurality of base stations, a transmission power offset of a channel transmitted from the base station selected by the mobile station and shared by the plurality of mobile stations is controlled. In the wireless control device,
  A table for classifying the received power intensity of the pilot signal;
  A table for classifying communication rates of channels shared by the plurality of mobile stations;
  A combination of classes of received power strengths of pilot signals of all cells in the radio link, a class of channel communication rates shared by the plurality of mobile stations, and an offset setting table for registering transmission power offsets;
  The received power strength of pilot signals of all cells in the radio link established between the mobile station and the network reported from the mobile station is classified according to the power strength and shared by the plurality of mobile stations. Offset determining means for classifying communication rates of channels and determining transmission power offsets of channels shared by the plurality of mobile stations based on the offset setting table;
  A wireless control device comprising: The wireless control device according to claim 4,
  The offset setting table registers a relationship between a combination of pilot signal received power strength extracted from pilot signal received power strength and a channel communication rate class shared by the plurality of mobile stations,
  The offset determination means includes a combination of pilot signal received power strengths extracted from pilot signal received power strengths of all cells in a radio link established between a mobile station and a network reported from a mobile station, and the plurality A radio control apparatus that controls a transmission power offset of a channel shared by the plurality of mobile stations based on a relationship with a communication rate class of a channel shared by the mobile stations. The wireless control device according to claim 4 or 5,
  The offset determining means includes a transmission power offset for a primary base station having the highest received power of a pilot signal of each cell measured by a mobile station in diversity handover, and transmission to a non-primary base station other than the primary base station. A wireless control device that controls a power offset.

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