JP4708162B2 - Wireless communication system and wireless communication control method - Google Patents

Wireless communication system and wireless communication control method Download PDF

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JP4708162B2
JP4708162B2 JP2005319291A JP2005319291A JP4708162B2 JP 4708162 B2 JP4708162 B2 JP 4708162B2 JP 2005319291 A JP2005319291 A JP 2005319291A JP 2005319291 A JP2005319291 A JP 2005319291A JP 4708162 B2 JP4708162 B2 JP 4708162B2
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radio base
base station
cell
wireless communication
station
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JP2007129405A (en
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浩輔 山崎
健也 米澤
和記 谷
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Kddi株式会社
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  The present invention relates to a wireless communication system and a wireless communication control method.

  2. Description of the Related Art Conventionally, a wide area cellular radio communication system that covers a wide area in a wireless connection service is known. In the operation of the wide-area wireless communication system, desired network performance may not be obtained because a single system is shared by many users. In addition, since the load from a large number of users is applied to a small number of base stations, the processing capability of the base stations may become a bottleneck. Furthermore, there are problems such as the cell size being too large and the base station installation cost being high in order to cope with the insensitive areas of radio waves generated locally in the shadows of buildings and indoors while suppressing interference. .

As one method for dealing with these problems, a pico cell method using a pico cell smaller than a wide area cell is known. In the pico cell system, the service area can be expanded at low cost by arranging the pico cell in the radio wave insensitive zone. Also, by placing the pico cell in a place with high communication traffic, it is possible to distribute the load from the user to the pico cell base stations. As a conventional system for realizing the picocell system, a plurality of different wireless communication systems such as a cellular system, a wireless LAN system, and a stratosphere platform are constructed, and wireless terminals having terminal functions of the plurality of wireless communication systems are prepared. There is known one that switches a wireless communication system to which the wireless terminal is connected as appropriate (see, for example, Patent Document 1). For example, a cellular system is constructed as a wide area cellular radio communication system, and a wireless LAN system is constructed as a pico cell radio communication system.
JP 2003-87272 A

  However, in the conventional system that realizes the above-described picocell system, the radio communication system differs between the wide-area cell system and the picocell system, so the radio terminal must support a plurality of radio communication systems, and the terminal cost and power consumption There arises a problem such as an increase in. In addition, there is a concern about an increase in load on the system, such as a more complicated process at the time of handover between different wireless communication systems than at the time of handover between single wireless communication systems.

  The present invention has been made in view of such circumstances, and the object of the present invention is to use a wide-area cell system and a pico-cell system while avoiding or reducing interference even in an environment where the wireless connection service areas overlap. An object of the present invention is to provide a wireless communication system and a wireless communication control method that can be realized by a single wireless communication system.

In order to solve the above problems, a wireless communication system according to the present invention includes a wide area cell that provides a wireless connection service area of a specific wireless communication system, and a wireless connection service area of the same wireless communication system as the wide area cell. And a control means for controlling so that the radio base stations for forming each cell can use the same frequency band at the same time, arranged so as to overlap with a pico cell that provides a wireless connection service area smaller than the wide area cell. The control means is a centralized control station that centrally controls a frequency channel used by each radio base station or transmission power of each radio base station based on an interference situation in each cell; The station transmits a control signal for observing the interference state toward the mobile station device, and the mobile station device and the control signal received from a desired radio base station And of calculating the interference situation value representing the interference situation of the control signal received from the radio base station other than the wireless base station, and notifies the interference status value to the central control station, characterized in that.

A wireless communication system according to the present invention includes a wide area cell that provides a wireless connection service area of a specific wireless communication system, and a wireless connection service area of the same wireless communication system as the wide area cell that is smaller than the wide area cell. The control means for controlling the radio base stations for forming each cell to be able to use the same frequency band at the same time is arranged so as to overlap with the pico cells providing the service area. Provided for each picocell radio base station, the picocell radio base station is a wide area cell radio base station for forming the wide area cell, based on respective received signals from other picocell radio base stations and mobile station devices, Calculate interference status values for cell radio base stations, pico cell radio base stations, and mobile station devices, check available frequency channels, and perform interference The frequency channel and transmission power used by the local station are determined based on the status value and the frequency channel vacancy, the determined frequency channel and transmission power are reported to other radio base stations and mobile station devices, and the determined frequency channel and When the transmission power is used and the notification of the frequency channel and the transmission power is received from another picocell radio base station, the interference state value is calculated and the frequency channel availability is checked .

A wireless communication system according to the present invention includes a wide area cell that provides a wireless connection service area of a specific wireless communication system, and a wireless connection service area of the same wireless communication system as the wide area cell that is smaller than the wide area cell. For each radio base station, a control means for controlling the radio base stations for forming the respective cells to be able to use the same frequency band at the same time is arranged so as to overlap the pico cells that provide the service area, A centralized control station that intensively grasps the interference situation in each cell and notifies each radio base station, and the control means uses the base station based on the interference situation notified from the centralized control station. The radio base station transmits a control signal for observing interference status directed to the mobile station apparatus, and the mobile station apparatus An interference status value representing an interference status between the control signal received from the line base station and the control signal received from a radio base station other than the desired radio base station is calculated, and the interference status value is notified to the central control station , characterized in that.

A wireless communication system according to the present invention includes a wide area cell that provides a wireless connection service area of a specific wireless communication system, and a wireless connection service area of the same wireless communication system as the wide area cell that is smaller than the wide area cell. The control means is arranged so as to overlap with the pico cells that provide the service area, and control so that the radio base stations for forming each cell can use the same frequency band at the same time, and the first control means includes: , A centralized control station that centrally controls the frequency channel used by each radio base station based on the interference situation in each cell, and the radio base station performs control for interference situation observation toward the mobile station apparatus. The mobile station apparatus transmits the control signal received from a desired radio base station and the control signal received from a radio base station other than the desired radio base station. An interference state value representing an interference state with the central control station, the interference state value is notified to the central control station, and the second control means controls transmission power in an autonomous and distributed manner in each of the radio base stations. Yes, based on the received signals from the respective radio base stations and mobile station devices, calculate the respective interference status values related to the respective radio base stations and mobile station devices, and the own station uses them based on the interference status values. The transmission power is determined .

The wireless communication control method according to the present invention includes a wide area cell that provides a wireless connection service area of a specific wireless communication system, a wireless connection service area of the same wireless communication system as the wide area cell, and a wireless that is smaller than the wide area cell. A radio communication control method in a radio communication system arranged so as to overlap with a pico cell that provides a connection service area, wherein a radio base station for forming each cell is used for observing an interference situation toward a mobile station device A process of transmitting a control signal, and an interference situation representing an interference situation between the control signal received from a desired radio base station and the control signal received from a radio base station other than the desired radio base station by the mobile station apparatus Calculating the value and notifying the centralized control station of the interference status value, so that the centralized control station can simultaneously use the same frequency band for the respective radio base stations. Based on said interference situation in each cell, and having a the steps of intensively controlling the transmission power of each radio frequency channel BS uses or each radio base station.

The wireless communication control method according to the present invention includes a wide area cell that provides a wireless connection service area of a specific wireless communication system, a wireless connection service area of the same wireless communication system as the wide area cell, and a wireless that is smaller than the wide area cell. A wireless communication control method in a wireless communication system in which a pico cell providing a connection service area is arranged so as to overlap with each other, wherein the wireless base stations for forming each cell are controlled so that the same frequency band can be used simultaneously. A control process is provided for each picocell radio base station for forming each picocell, and the picocell radio base station forms a wideband cell, a wideband cell radio base station, another picocell radio base station, and a mobile station Based on each received signal from the device, each of the base station radio base station, pico cell radio base station, and mobile station device Calculate the status value, check the frequency channel availability, determine the frequency channel and transmission power used by the local station based on the interference status value and frequency channel availability, and use the determined frequency channel and transmission power to other radio bases. Broadcast to the station and mobile station apparatus, use the determined frequency channel and transmission power, and receive notification of the frequency channel and transmission power from other picocell radio base stations, calculate the interference status value and determine whether the frequency channel is free It is characterized by conducting a survey .

The wireless communication control method according to the present invention includes a wide area cell that provides a wireless connection service area of a specific wireless communication system, a wireless connection service area of the same wireless communication system as the wide area cell, and a wireless that is smaller than the wide area cell. A wireless communication control method in a wireless communication system in which a pico cell providing a connection service area is arranged so as to overlap with each other , wherein the wireless base stations for forming each cell are controlled so that the same frequency band can be used simultaneously. A control process is provided for each radio base station, and the radio base station transmits a control signal for observing interference status directed to a mobile station apparatus, and the control received by the mobile station apparatus from a desired radio base station Calculate an interference status value representing an interference status between the signal and the control signal received from a radio base station other than the desired radio base station, and send the interference status value to the central control station The central control station intensively grasps the interference situation in each cell and notifies each radio base station, the radio base station based on the interference situation notified from the central control station, The frequency channel and transmission power used by the own station are determined .
The wireless communication control method according to the present invention includes a wide area cell that provides a wireless connection service area of a specific wireless communication system, a wireless connection service area of the same wireless communication system as the wide area cell, and a wireless that is smaller than the wide area cell. A radio communication control method in a radio communication system arranged so as to overlap with a pico cell that provides a connection service area, wherein a radio base station for forming each cell is used for observing an interference situation toward a mobile station device A process of transmitting a control signal, and an interference situation representing an interference situation between the control signal received from a desired radio base station and the control signal received from a radio base station other than the desired radio base station by the mobile station apparatus Calculating the value and notifying the centralized control station of the interference status value, so that the centralized control station can simultaneously use the same frequency band for the respective radio base stations. Based on the interference situation in each cell, the process of centrally controlling the frequency channel used by each radio base station, and so that the radio base station can simultaneously use the same frequency band A process of controlling transmission power in an autonomous and distributed manner, and the radio base station sends each radio base station and mobile station apparatus to each radio base station and mobile station apparatus based on respective received signals from the radio base stations and mobile station apparatuses. Each interference situation value is calculated, and the transmission power used by the own station is determined based on the interference situation value.

  According to the present invention, it is possible to realize a wide area cell system and a pico cell system in a single wireless communication system while avoiding or reducing interference even in an environment where the wireless connection service areas overlap.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a diagram showing an overall configuration of a wireless communication system according to an embodiment of the present invention. In FIG. 1, a wide area cell base station 1 forms a wide area cell 100 that provides a wireless connection service area of a specific wireless communication system. The small radio base station 2 (picocell base station) forms a picocell 200 that is a radio connection service area of the same radio communication scheme as the wide area cell 100 and provides a smaller radio connection service area than the wide area cell 100. The small radio base station 2 can be installed, for example, by the user himself / herself in an arbitrary place such as a user's house. The wide-area cell base station 1 and the small radio base station 2 are both base station apparatuses of the present radio communication system and have the radio base station function of the same radio communication system. Accordingly, the mobile station device 3 which is a wireless terminal device of the present wireless communication system has only the terminal function of the wireless communication system, and can wirelessly connect to both the wide-area cell base station 1 and the small wireless base station 2. it can.

  The central control station 4 is communicatively connected to each small radio base station 2. The wide-area cell base station 1 and the central control station 4 are connected to a public network 5 for communication.

  As shown in FIG. 1, the wide area cell 100 and the pico cell 200 are arranged so as to overlap each other. In the overlapping method, the entire pico cell 200 may be included in the wide area cell 100, or the pico cell 200 may be partially included. Further, the pico cells 200 may be arranged so as to overlap each other. Moreover, the pico cell 200 arrange | positioned in the wide area cell 100 may be one, or plural.

As described above, in the present radio communication system, the wide area cell 100 and the pico cell 200 of the same radio communication system may be arranged to overlap each other, and further, the pico cells 200 may be arranged to overlap each other. For this reason, when the same frequency band is used in the wide area cell 100 and the pico cell 200 at the same time, the frequency channels used in the cells 100 and 200 may interfere with each other. In this embodiment, in order to avoid or reduce the interference, a control unit is provided for controlling so that the radio base stations for forming the cells 100 and 200 can simultaneously use the same frequency band. Specifically, control means for adjusting the frequency channel or transmission power used by the wide-area cell base station 1 and each small radio base station 2 is provided.
The “frequency band” refers to the entire radio frequency band assigned to a certain radio communication system. Further, the “frequency channel” refers to a further subdivided frequency band. For example, if the “frequency band” assigned to an entire wireless communication system is 5.15 GHz to 5.25 GHz, the “frequency channels” that can be used in that frequency band are, for example, about 20 MHz in width and center. Four types of frequencies of 5.17GHz, 5.19GHz, 5.21GHz, 5.23GHz can be selected.

  Hereinafter, an example is given and the radio | wireless communication control process which concerns on this embodiment is demonstrated in detail. In the description of each embodiment, a case where two pico cells 200 are arranged in the wide area cell 100 as illustrated in FIG. 1 will be described as an example.

  FIG. 2 is a sequence chart showing a wireless communication control processing procedure according to the first embodiment of the present invention. In the first embodiment, the central control station 4 adjusts the frequency channel and transmission power intensively.

  In FIG. 2, the base stations 1 and 2 and the mobile station devices 3 are in normal operation (step S0). The centralized control station 4 starts a frequency channel switching / transmission power control procedure periodically or when an event trigger occurs (for example, when the installation of a new small radio base station 2 is completed) (step S1). The wide-area cell base station 1 and each small radio base station 2 are notified of the activation of the frequency channel switching / transmission power control procedure (step S2).

  Next, the wide-area cell base station 1 and each small radio base station 2 that have received the notification transmit a control signal for observing the interference state toward the mobile station device 3 (steps S3, S4, S5). The control signal is transmitted at a constant cycle. Each mobile station device 3 measures the received signal strength (RSSI (Received Signal Strength Indicator)) of the received control signal and calculates a value (for example, a C / I value (Carrier to Interference Ratio)) indicating an interference state. To do. Then, the calculated interference state value is notified to the nearest base stations 1 and 2 (for example, the base station having the maximum received signal strength) (steps S6 and S8). Receiving the notification, the base stations 1 and 2 transfer the received interference status value to the central control station 4 (steps S7 and S9). In the example of FIG. 2, the interference status value of the mobile station apparatus 3 (A) is notified to the centralized control station 4 via the small radio base station 2 (A). Further, the interference status value of the mobile station device 3 (B) is notified to the centralized control station 4 via the small radio base station 2 (B).

  Next, the centralized control station 4 determines the frequency channel and transmission power of the wide-area cell base station 1 and each small radio base station 2 so as to avoid or reduce interference between frequency channels based on the received interference status value. (Step S10). Next, the centralized control station 4 notifies the determined frequency channel and transmission power to the wide-area cell base station 1 and each small radio base station 2 (steps S11, S12, S13).

  Next, each of the wide-area cell base station 1 and each small radio base station 2 sets the frequency channel and transmission power notified from the centralized control station 4, and broadcasts its own frequency channel to the mobile station device 3 respectively ( Steps S14, S15, S16). A control signal for broadcasting the frequency channel is transmitted at a constant cycle. Next, the wide-area cell base station 1 and each small radio base station 2 simultaneously change the frequency channel and transmission power (step S17). Thereafter, the base stations 1 and 2 and the mobile station devices 3 resume normal operation (step S18).

  The centralized control station 4 determines only the frequency channels of the wide area cell base station 1 and each small radio base station 2 or only the transmission power, thereby avoiding or reducing interference between the frequency channels in the cells 100 and 200. You may do it.

  Alternatively, the interference situation value may be calculated by measuring the received signal strength based on the received radio signal without using the control signal for observing the interference situation.

  According to the first embodiment described above, since the frequency channel and transmission power are intensively adjusted by the centralized control station 4, the adjustment management can be performed collectively.

  FIG. 3 is a sequence chart showing a wireless communication control processing procedure according to the second embodiment of the present invention. In the second embodiment, each small radio base station 2 adjusts the frequency channel and transmission power in an autonomous and distributed manner. In addition, in FIG. 3, the case where the small radio base station 2 (B) is newly installed is illustrated.

  In FIG. 3, the wide-area cell base station 1, the small radio base station 2 (A), and each mobile station apparatus 3 are in normal operation (step S30). When the newly established small radio base station 2 (B) is powered on (step S31), it negotiates with the central control station 4 to establish synchronization (step S32).

  Next, the small radio base station 2 (B) observes the interference state (step S33). In the observation of the interference situation, the received signal strengths from the wide-area cell base station 1, the small radio base station 2 (A), and each mobile station apparatus 3 are measured. Then, based on the measured RSSI, each interference state value (for example, C / I value) relating to the wide-area cell base station 1, the small radio base station 2 (A), and each mobile station apparatus 3 is calculated. Also, check the frequency channel availability.

  Next, the small radio base station 2 (B) determines the frequency channel and transmission power used by the small radio base station 2 (B) so as to avoid or reduce interference between the frequency channels based on the observation result of the interference state (step S34). ). Next, the small radio base station 2 (B) notifies the base station 1, 2 and each mobile station apparatus 3 of the determined frequency channel and transmission power of the own base station using control information (step S35). Thereafter, the small radio base station 2 (B) starts normal operation with the frequency channel and transmission power determined in step S34 (step S36).

  Next, the small radio base station 2 (A) that has received the notification of the frequency channel and transmission power from the small radio base station 2 (B), and the frequency channel associated with the establishment of the small radio base station 2 (B) by the notification, The setting of the transmission power is recognized, and thereby the interference state is observed (step S41). In the observation of the interference state, the same observation process as in step S33 is performed. Also, check the frequency channel availability. If there is a mobile station apparatus 3 that is currently connected, the interference state value observed by the mobile station apparatus 3 is received (step S42). In the example of FIG. 3, the interference state value observed by the mobile station device 3 (A) is received.

  Next, the small radio base station 2 (A) determines the frequency channel and transmission power used by the local radio base station 2 (A) so as to avoid or reduce interference between the frequency channels based on the observation result of the interference state (step S43). ). Next, the small radio base station 2 (A) notifies the base station 1, 2 and each mobile station apparatus 3 of the determined frequency channel and transmission power of the own station by using the control information (step S44). Thereafter, the small radio base station 2 (A) resumes normal operation with the frequency channel and transmission power determined in step S43 (step S45).

  Note that the small radio base station 2 may autonomously adjust the frequency channel and transmission power periodically, for example, other than when the small radio base station 2 is opened.

  According to the second embodiment described above, since the frequency channels and transmission power are adjusted autonomously and distributed by each small radio base station 2, the centralized control station 4 does not need processing for the adjustment, and the centralized control station 4 can be minimized.

  FIG. 4 is a sequence chart showing a wireless communication control processing procedure according to the third embodiment of the present invention. The third embodiment is an example of a combination of the first embodiment and the second embodiment described above, in which the central control station 4 collects interference conditions and transfers them to the base stations 1 and 2. 2 adjusts the frequency channel and transmission power in an autonomous and distributed manner from the interference state. In FIG. 4, parts corresponding to the steps in FIGS. 2 and 3 are denoted by the same reference numerals.

  In FIG. 4, the base stations 1 and 2 and the mobile station devices 3 are in normal operation (step S0). The central control station 4 starts a frequency channel switching / transmission power control procedure and collects interference status values from the base stations 1 and 2 (steps S1 to S9), as in FIG. Next, the centralized control station 4 transfers the collected interference status values to the base stations 1 and 2 (steps S51, S52, and S53).

  Next, each of the base stations 1 and 2 determines a frequency channel and transmission power used by the base station so as to avoid or reduce interference between frequency channels based on the interference status value received from the centralized control station 4. (Step S43). Next, each of the base stations 1 and 2 sets the determined frequency channel and transmission power, and broadcasts its own frequency channel to the mobile station device 3 (steps S14, S15, and S16). Next, the base stations 1 and 2 simultaneously change the frequency channel and transmission power (step S17). Thereafter, the base stations 1 and 2 and the mobile station devices 3 resume normal operation (step S18).

  In addition, by notifying each mobile station apparatus 3 that the frequency channel is to be changed in advance, the frequency channel switching in step S17 can be performed smoothly.

  According to the third embodiment described above, the interference state is collected by the centralized control station 4 and used for adjusting the autonomous distributed frequency channel and transmission power in each of the base stations 1 and 2, so that it is based on the detailed interference state. Adjustments can be made. Further, the central control station 4 only collects and transfers interference conditions, and the apparatus cost of the central control station 4 can be kept low.

  FIG. 5 is a sequence chart showing a wireless communication control processing procedure according to the fourth embodiment of the present invention. The fourth embodiment is an example of a combination of the first embodiment and the second embodiment, similar to the third embodiment described above, in which the central control station 4 collects interference conditions and the frequency channels of the base stations 1 and 2 are collected. Each base station 1, 2 observes the interference situation in the frequency channel and adjusts transmission power in an autonomous and distributed manner. In FIG. 5, the same reference numerals are given to portions corresponding to the steps in FIGS. 2 and 3.

  In FIG. 5, the base stations 1 and 2 and the mobile station devices 3 are operating normally (step S0). The central control station 4 starts a frequency channel switching / transmission power control procedure and collects interference status values from the base stations 1 and 2 (steps S1 to S9), as in FIG. Next, the centralized control station 4 determines the frequency channels of the base stations 1 and 2 so as to avoid or reduce interference between the frequency channels based on the collected interference status values (step S10a).

  Next, the centralized control station 4 notifies the determined frequency channels to the base stations 1 and 2 (steps S11a, S12a, and S13a). Next, each of the base stations 1 and 2 sets the frequency channel notified from the centralized control station 4 and broadcasts its own frequency channel to the mobile station device 3 (steps S14, S15, and S16). Next, the base stations 1 and 2 change the frequency channel at the same time (step S17a).

  Next, each of the base stations 1 and 2 observes the interference state similar to that in FIG. 3 (step S41). Next, each base station 1 and 2 determines the transmission power used by the base station so as to avoid or reduce interference between frequency channels based on the observation results of the respective interference conditions, and the transmission power is determined according to the determination. Control (step S43a). Thereafter, the base stations 1 and 2 and the mobile station devices 3 resume normal operation (step S18).

  In addition, each base station 1 and 2 may adjust transmission power autonomously regularly.

  According to the above-described fourth embodiment, only the frequency channel is intensively adjusted by the centralized control station 4, and the transmission power is adjusted autonomously in the base stations 1 and 2, so that the frequency channel adjustment management is performed. While being able to perform collectively, transmission power adjustment can be performed based on the real-time interference situation of each base station 1 and 2. Further, since the central control station 4 does not adjust transmission power, the load is reduced.

  As described above, according to the present embodiment, since the control means for adjusting the frequency channel or transmission power used by the wide area cell base station 1 and each small radio base station 2 is provided, the wide area cell 100 of the same radio communication system is provided. Even if the pico cells 200 are arranged so as to overlap each other, and even if the pico cells 200 are arranged so as to overlap each other, it is possible to avoid or reduce interference between frequency channels and to maintain good communication quality. Become.

Thereby, a wide area cell system and a pico cell system are realizable with a single radio | wireless communications system. As a result, the following effects are obtained.
(1) Even in areas where radio waves do not reach locally, such as in the shadow of a building or indoors, sufficient received signal strength can be obtained by the placement of picocells, contributing to the expansion of the wireless connection service area.
(2) Even when the number of users becomes enormous, users that cannot be accommodated by one wide-area cell base station can be accommodated by the picocell base station, so that the number of users can be increased while maintaining desired network performance. Can respond.
(3) Since the frequency channel or transmission power can be automatically controlled, the cell design and channel design prior to the installation of the picocell base station are not required, leading to a reduction in man-hours.
(4) Since the wide area cell method and the pico cell method can be realized by the same wireless communication system, the wireless terminal only needs to support one wireless communication system, and increase in terminal cost and power consumption can be prevented.

The embodiment of the present invention has been described in detail with reference to the drawings. However, the specific configuration is not limited to this embodiment, and includes design changes and the like within a scope not departing from the gist of the present invention.
For example, as a wireless communication system, for example, any one of time division multiple access (TDMA), frequency division multiple access (FDMA), code division multiple access (CDMA), and space division multiple access (SDMA) A scheme may be applied. Further, more efficient operation is possible by using space division by cell sectorization or introduction of an array antenna.

1 is a diagram illustrating an overall configuration of a wireless communication system according to an embodiment of the present invention. It is a sequence chart which shows the radio | wireless communication control processing procedure which concerns on Example 1 of this invention. It is a sequence chart which shows the radio | wireless communication control processing procedure which concerns on Example 2 of this invention. It is a sequence chart which shows the radio | wireless communication control processing procedure which concerns on Example 3 of this invention. It is a sequence chart which shows the radio | wireless communication control processing procedure which concerns on Example 4 of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Wide area cell base station, 2 ... Small radio base station (picocell base station), 3 ... Mobile station apparatus, 4 ... Central control station, 5 ... Public network, 100 ... Wide area cell, 200 ... Picocell

Claims (8)

  1. A wide area cell that provides a wireless connection service area of a specific wireless communication method overlaps a pico cell that is a wireless connection service area of the same wireless communication method as the wide area cell and provides a wireless connection service area smaller than the wide area cell. And place
    Control means for controlling so that the radio base station for forming each cell can simultaneously use the same frequency band ,
    The control means is a centralized control station that centrally controls the frequency channel used by each radio base station or the transmission power of each radio base station based on the interference situation in each cell,
    The radio base station transmits an interference state observation control signal directed to the mobile station device,
    The mobile station apparatus calculates an interference situation value representing an interference situation between the control signal received from a desired radio base station and the control signal received from a radio base station other than the desired radio base station, and an interference situation value To the central control station,
    A wireless communication system.
  2. A wide area cell that provides a wireless connection service area of a specific wireless communication method overlaps a pico cell that is a wireless connection service area of the same wireless communication method as the wide area cell and provides a wireless connection service area smaller than the wide area cell. And place
    Control means for controlling so that radio base stations for forming each cell can simultaneously use the same frequency band, each pico cell radio base station for forming each pico cell ,
    The picocell radio base station is
    Based on the respective received signals from the wide-area cell radio base station, the other pico-cell radio base stations, and the mobile station apparatus for forming the wide-area cell, the wide-area cell radio base station, the pico-cell radio base station, and the mobile station apparatus Calculate each interference status value, check the frequency channel availability, determine the frequency channel and transmission power used by the local station based on the interference status value and frequency channel availability, and determine the determined frequency channel and transmission power to other Broadcast to the radio base station and mobile station device, use the determined frequency channel and transmission power,
    Upon receiving notification of the frequency channel and transmission power from another picocell radio base station, the interference status value is calculated and the frequency channel is checked.
    A wireless communication system.
  3. A wide area cell that provides a wireless connection service area of a specific wireless communication method overlaps a pico cell that is a wireless connection service area of the same wireless communication method as the wide area cell and provides a wireless connection service area smaller than the wide area cell. And place
    Control means for controlling the radio base stations for forming each cell to use the same frequency band at the same time for each radio base station,
    A centralized control station that intensively grasps the interference situation in each cell and notifies each radio base station , and
    The control means determines the frequency channel and transmission power used by the local station based on the interference status notified from the central control station,
    The radio base station transmits an interference state observation control signal directed to the mobile station device,
    The mobile station apparatus calculates an interference situation value representing an interference situation between the control signal received from a desired radio base station and the control signal received from a radio base station other than the desired radio base station, and an interference situation value To the central control station,
    A wireless communication system.
  4. A wide area cell that provides a wireless connection service area of a specific wireless communication method overlaps a pico cell that is a wireless connection service area of the same wireless communication method as the wide area cell and provides a wireless connection service area smaller than the wide area cell. And place
    Control means for controlling so that the radio base station for forming each cell can simultaneously use the same frequency band ,
    The first control means is a centralized control station that centrally controls a frequency channel used by each radio base station based on an interference situation in each cell,
    The radio base station transmits an interference state observation control signal directed to the mobile station device,
    The mobile station apparatus calculates an interference situation value representing an interference situation between the control signal received from a desired radio base station and the control signal received from a radio base station other than the desired radio base station, and an interference situation value To the central control station,
    The second control means controls transmission power in an autonomous and distributed manner in each radio base station, and each radio base station based on respective received signals from each radio base station and mobile station apparatus And calculating each interference situation value related to the mobile station apparatus, and determining the transmission power used by the own station based on the interference situation value,
    A wireless communication system.
  5. A wide area cell that provides a wireless connection service area of a specific wireless communication method overlaps a pico cell that is a wireless connection service area of the same wireless communication method as the wide area cell and provides a wireless connection service area smaller than the wide area cell. A wireless communication control method in a wireless communication system arranged as described above,
    A process in which a radio base station for forming each cell transmits a control signal for observing interference status directed to a mobile station device;
    The mobile station apparatus calculates an interference status value representing an interference status between the control signal received from a desired radio base station and the control signal received from a radio base station other than the desired radio base station, and the interference status value To notify the central control station,
    Based on the interference situation in each cell, the centralized control station uses the frequency channel used by each radio base station or the transmission of each radio base station so that each radio base station can simultaneously use the same frequency band. The process of centrally controlling power ,
    A wireless communication control method comprising:
  6. A wide area cell that provides a wireless connection service area of a specific wireless communication method overlaps a pico cell that is a wireless connection service area of the same wireless communication method as the wide area cell and provides a wireless connection service area smaller than the wide area cell. A wireless communication control method in a wireless communication system arranged as described above,
    A control process for controlling the radio base stations for forming each cell so that the same frequency band can be used simultaneously is provided for each pico cell radio base station for forming each pico cell,
    The picocell radio base station is
    Based on the respective received signals from the wide-area cell radio base station, the other pico-cell radio base stations, and the mobile station apparatus for forming the wide-area cell, the wide-area cell radio base station, the pico-cell radio base station, and the mobile station apparatus Calculate each interference status value, check the frequency channel availability, determine the frequency channel and transmission power used by the local station based on the interference status value and frequency channel availability, and determine the determined frequency channel and transmission power to other Broadcast to the radio base station and mobile station device, use the determined frequency channel and transmission power,
    Upon receiving notification of the frequency channel and transmission power from another picocell radio base station, the interference status value is calculated and the frequency channel is checked.
    A wireless communication control method.
  7. A wide area cell that provides a wireless connection service area of a specific wireless communication method overlaps a pico cell that is a wireless connection service area of the same wireless communication method as the wide area cell and provides a wireless connection service area smaller than the wide area cell. A wireless communication control method in a wireless communication system arranged as described above,
    Provided for each radio base station a control process for controlling so that the radio base station for forming each cell can simultaneously use the same frequency band,
    The radio base station transmits a control signal for observing the interference situation toward the mobile station device,
    The mobile station apparatus calculates an interference status value representing an interference status between the control signal received from a desired radio base station and the control signal received from a radio base station other than the desired radio base station, and the interference status value To the central control station,
    The central control station intensively grasps the interference situation in each cell and notifies each radio base station,
    The radio base station determines the frequency channel and transmission power used by the own station based on the interference status notified from the central control station.
    A wireless communication control method.
  8. A wide area cell that provides a wireless connection service area of a specific wireless communication method overlaps a pico cell that is a wireless connection service area of the same wireless communication method as the wide area cell and provides a wireless connection service area smaller than the wide area cell. A wireless communication control method in a wireless communication system arranged as described above,
    A process in which a radio base station for forming each cell transmits a control signal for observing interference status directed to a mobile station device;
    The mobile station apparatus calculates an interference status value representing an interference status between the control signal received from a desired radio base station and the control signal received from a radio base station other than the desired radio base station, and the interference status value To notify the central control station,
    The central control station centrally controls the frequency channel used by each radio base station based on the interference situation in each cell so that each radio base station can simultaneously use the same frequency band; ,
    The wireless base station has a process of controlling transmission power in an autonomous and distributed manner so that the wireless base stations can use the same frequency band at the same time,
    The radio base station calculates each interference status value related to each radio base station and mobile station device based on the respective received signals from each radio base station and mobile station device, and automatically determines based on the interference status value. Determine the transmit power used by the station,
    A wireless communication control method.
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