JP3319498B2 - Mobile communication system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a first mobile communication system comprising a plurality of radio base stations and a plurality of mobile stations communicating therewith, and a radio frequency band narrower than the first mobile communication system. The present invention relates to a mobile communication system in which a second mobile communication system configured by a plurality of radio base stations and a plurality of mobile stations that communicate with each other using the same radio frequency band is shared.

[0002]

2. Description of the Related Art A mobile communication system provides a mobile communication service to a plurality of mobile stations by arranging a plurality of radio base stations in a service area. At this time, since the radio frequency that can be used is limited, it is general to use the radio frequency band allocated to the system repeatedly and spatially and temporally.

An access method for realizing such repetitive use of the radio frequency band is roughly classified into Frequency Division Multiple Access (FD).
MA) method, Time Division Multiple Access (Time Division Multiple Access)
Access; TDMA) and code division multiple access (Co)
There is a de Division Multiple Access (CDMA) system.

[0004] Conventional mobile communication services such as automobiles / mobile phones and simplified mobile phones are based on the FDMA system or the TDM system.
A method is used. In the FDMA system and the TDMA system, a frequency band allocated to a system is divided into a radio channel having a band that is sufficiently narrower than the band and used for communication between a radio base station and a mobile station. further,
In order to use frequencies more effectively, spatially identical channels are used repeatedly.

On the other hand, the CDMA system is a system in which the same frequency band is shared by a plurality of users, and the information signal of each user uses a spreading code assigned to each user.
The signal is spread over a wider band than the band that the original information signal has. The bandwidth after this spreading is usually FDMA or T
It is configured to be sufficiently larger than the bandwidth of one radio channel of the DMA. For example, PDC used for digital mobile phone service provided in Japan
The channel interval in the (Personal Digital Cellular) system is 25 kHz, while the bandwidth used in the CDMA system is several MHz to several tens MHz. Therefore, the power per unit frequency of the spread signal of the CDMA system is FDMA
And the received power of the desired wave in the TDMA system is smaller than the received power of the desired wave, so that the interference of the CDMA system signal on the FDMA or TDMA system signal is small as shown in FIG. Conversely, when demodulating a CDMA signal, a process called despreading is performed to restore the spread signal to the original information signal. As a result, the FD existing in the same band is
Since signals of the MA and TDMA systems are spread over a wide band, as shown in FIG.
The interference given by the signal of the DMA system is small. Therefore,
Conventionally used FDMA and TDMA schemes and CDMA
The schemes can share the same radio frequency band.

However, when the same radio frequency band is shared as described above, the number of subscribers accommodated in each system is surely smaller than the capacity of accommodated subscribers when a different radio frequency band is used for each system. Will do. From this point of view, the literature (Donald M. Grieco and Donald L. Sc)
hilling, “The Capacity of Broadband CDMAOve
rlaying a GSM Cellular System, "IEEE 44th
Vehicular Technolgy Conference, pp. 31-35, June
1994), the notch filter is used for transmission and reception in the CDMA system, so that the CDMA system
Interference to DMA and TDMA systems and FDMA and T
A method has been proposed in which the influence of the DMA system on the CDMA system is reduced, the communication quality is improved, and the capacity of the accommodated subscriber is increased. In this method, as shown in FIG. 15A, a CDMA signal and an FDMA or TDMA
This is a method for reducing mutual interference by using a filter having a frequency characteristic as shown in FIG.

However, in such a system using a notch filter for transmission and reception, in order to improve the communication quality or increase the capacity of accommodating subscribers, it is necessary to accurately grasp the radio channel used by the FDMA or TDMA system. is necessary. If the radio channel set in the notch filter and the radio channel actually used in the FDMA or TDMA system are different,
Not only the effect of using the notch filter is not sufficiently obtained, but also the communication quality may be degraded or the capacity of the accommodated subscriber may be reduced as compared with the case where the notch filter is not used. In the cited document, the effect of the notch filter is evaluated on the assumption that the wireless base station and the mobile station of the CDMA system fully understand the wireless channel used in the FDMA or TDMA system. But FDMA
There is no mention of a method of grasping a radio channel used in a TDMA system.

[0008]

In the conventional method, the FD
Since the radio channel used in the MA or TDMA system cannot be grasped, there has been a serious problem that a sufficient improvement in communication quality or an effect of increasing the capacity of accommodated subscribers cannot be obtained. Further, there is a serious disadvantage that is not preferable for practical use, which further deteriorates the communication quality or further reduces the capacity of accommodating subscribers.

The present invention has been made in view of the above problems, and has a first mobile communication system including a plurality of radio base stations and a plurality of mobile stations communicating therewith, and a first mobile communication system. When the second mobile communication system composed of a plurality of radio base stations and a plurality of mobile stations communicating with each other using a narrower radio frequency band shares the same radio frequency band, high quality and high quality can be achieved. An object of the present invention is to provide a mobile communication system having a subscriber capacity.

[0010]

In order to achieve the above object, according to the present invention, a first mobile communication system comprising a plurality of radio base stations and a plurality of mobile stations communicating therewith is provided. A second mobile communication system configured by a plurality of radio base stations and a plurality of mobile stations communicating with each other using a radio frequency band narrower than the first mobile communication system shares the same radio frequency band A mobile base station belonging to the first mobile communication system notifies a wireless channel used in the second mobile communication system to a mobile station belonging to the first mobile communication system. Means for performing the first mobile communication
The notch filter of the wireless base station belonging to the
In the second mobile communication system obtained by the notification
Means for setting based on information of wireless channel used
And characterized in that:

According to a second aspect of the present invention, there is provided a first mobile communication system including a plurality of radio base stations and a plurality of mobile stations communicating therewith, and the first mobile communication system is narrower than the first mobile communication system. A second mobile communication system including a plurality of radio base stations and a plurality of mobile stations communicating with each other using a radio frequency band is a mobile communication system sharing the same radio frequency band. Means for a radio base station belonging to said first mobile communication system to notify a radio channel used in said mobile communication system to a mobile station belonging to said first mobile communication system ;
The notch figure of the mobile station belonging to the first mobile communication system
The second mobile communication obtained by the notification.
Based on the information of the wireless channel used in the system,
And means for determining

Further, the invention according to claim 3 includes a plurality of
It consists of a wireless base station and a plurality of mobile stations communicating with it.
A first mobile communication system to be established;
Communication using a narrower radio frequency band than
Composed of multiple wireless base stations and multiple mobile stations
The same mobile radio frequency band
A mobile communication system sharing a radio base station belonging to the first mobile communication system, by executing autonomously scans, the means to know the radio channel used by the second mobile communication system Having the second
The radio channel used in the mobile communication system,
The radio base station belonging to the first mobile communication system is the first mobile communication system.
For notifying mobile stations belonging to a given mobile communication system
Stage and a radio base station belonging to the first mobile communication system
Notch filter by the notification or the scan
Used in the second mobile communication system obtained
Means for setting based on the information of the wireless channel .

Further, the invention according to claim 4 includes a plurality of
It consists of a wireless base station and a plurality of mobile stations communicating with it.
A first mobile communication system to be established;
Communication using a narrower radio frequency band than
Composed of multiple wireless base stations and multiple mobile stations
The same mobile radio frequency band
A mobile communication system sharing a radio base station belonging to the first mobile communication system, by executing autonomously scans, the means to know the radio channel used by the second mobile communication system Having the second
The radio channel used in the mobile communication system,
The radio base station belonging to the first mobile communication system is the first mobile communication system.
For notifying mobile stations belonging to a given mobile communication system
And a mobile station belonging to the first mobile communication system.
Switch filter by the notification or the scan
The radio used in the obtained second mobile communication system
Means for setting based on channel information .

Further, the invention according to claim 5 provides a first mobile communication system including a plurality of radio base stations and a plurality of mobile stations communicating therewith, and a radio communication system narrower than the first mobile communication system. A second mobile communication system configured by a plurality of radio base stations and a plurality of mobile stations that communicate with each other using a frequency band is a mobile communication system sharing the same radio frequency band, The radio base station belonging to the second mobile communication system notifies the radio base station belonging to the first mobile communication system of a radio channel used in the mobile communication system.

[0015] Further, the invention according to claim 6 is the present invention.
In 5 , the radio base station belonging to the first mobile communication system is configured to transmit a radio channel used in the second mobile communication system based on information notified from a radio base station belonging to the second mobile communication system. The scan is performed autonomously.

Further, the invention according to claim 7 provides a first mobile communication system comprising a plurality of radio base stations and a plurality of mobile stations communicating therewith, and a radio communication system narrower than the first mobile communication system. A second mobile communication system configured by a plurality of radio base stations and a plurality of mobile stations that communicate with each other using a frequency band is a mobile communication system sharing the same radio frequency band, Means for a mobile station belonging to the first mobile communication system to notify a radio base station belonging to the first mobile communication system of a radio channel used in a mobile communication system ;
Notchoff of a radio base station belonging to the first mobile communication system
The second mobile communication obtained by the notification.
Based on information of wireless channels used in communication systems
Setting means .

Further, the invention according to claim 8 provides a first mobile communication system comprising a plurality of radio base stations and a plurality of mobile stations communicating therewith, and a radio communication system narrower than the first mobile communication system. A second mobile communication system configured by a plurality of radio base stations and a plurality of mobile stations that communicate with each other using a frequency band is a mobile communication system sharing the same radio frequency band, Means for a mobile station belonging to the first mobile communication system to notify a radio base station belonging to the first mobile communication system of a radio channel used in a mobile communication system ;
Notch fill of mobile station belonging to first mobile communication system
The second mobile communication system obtained by the notification.
Set based on information on the wireless channel used by the system
And means for performing the operation.

Further, the invention according to claim 9 includes a plurality of
It consists of a wireless base station and a plurality of mobile stations communicating with it.
A first mobile communication system to be configured and a first mobile communication system.
Communicate with each other using a narrower radio frequency band than the
Composed by multiple radio base stations and multiple mobile stations
The second mobile communication system shares the same radio frequency band.
The mobile station belonging to the first mobile communication system has means for knowing a radio channel used in the second mobile communication system by performing autonomous scanning. , The second mobile communication
Wireless channel used in the communication system,
A mobile station belonging to a mobile communication system;
Means for notifying the wireless base station belonging to the system
Notch of a radio base station belonging to the first mobile communication system
Filters obtained by the notification or the scan
Wireless channel used in the second mobile communication system
Means for setting based on the information of the channel .

Furthermore, the invention includes a plurality according to claim 10
Radio base station and multiple mobile stations communicating with it
First mobile communication system configured and first mobile communication
Communicate with each other using a narrower radio frequency band than the system
Mobile base station and multiple mobile stations.
The second mobile communication system is configured to use the same radio frequency band.
A shared mobile communication system, wherein a mobile station belonging to the first mobile communication system has means for knowing a radio channel used in the second mobile communication system by performing autonomous scanning. The second movement
A radio channel used in the communication system,
A mobile station belonging to a mobile communication system,
Means for notifying a radio base station belonging to the system;
Notchoff of a mobile station belonging to the first mobile communication system
Filter obtained by the notification or the scan
Wireless channel used in the second mobile communication system
Means for setting based on the information of the file . Further, the invention according to claim 11 provides a first mobile communication system including a plurality of radio base stations and a plurality of mobile stations communicating therewith, and a radio frequency band narrower than the first mobile communication system. A second mobile communication system comprising a plurality of radio base stations and a plurality of mobile stations communicating with each other using the same radio frequency band, wherein the second mobile communication system Wireless base station belonging to the second mobile communication system to the mobile station belonging to the first mobile communication system. Further, in the invention according to claim 12, in claim 11, the mobile station belonging to the first mobile communication system, the mobile station belonging to the second mobile communication system based on the information notified from a radio base station belonging to the second mobile communication system. Scanning of a wireless channel used in the second mobile communication system autonomously. further,
The invention according to Claim 13 is the invention according to any one of Claims 5, 6, 11, and 12, wherein the notch filter of the radio base station belonging to the first mobile communication system is obtained by the notification or the scan. A means for setting based on information of a wireless channel used in the second mobile communication system. Further, claim 1
The invention according to claim 4, according to any one of claims 5, 6, 11 and 12, wherein the notch filter of the mobile station belonging to the first mobile communication system is obtained by the notification or the scan. It is characterized by comprising means for setting based on information of a wireless channel used in the communication system.

[0020]

BEST MODE FOR CARRYING OUT THE INVENTION

(Embodiment 1) An embodiment of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a diagram showing a configuration of a mobile communication system to which the present invention is applied. Here, as an example, a mobile communication system using a CDMA scheme (hereinafter, referred to as a mobile communication system)
A case will be described in which a mobile communication system using the TDMA scheme (hereinafter, referred to as a TDMA system) shares the same radio frequency band. C
When a DMA system and a mobile communication system using FDMA (hereinafter, referred to as an FDMA system) share the same radio frequency band, when a wideband CDMA system and a narrowband CDMA system share the same radio frequency band, or , CDMA system, TDMA system and FDMA system can share the same radio frequency band, and the present invention can be implemented in exactly the same manner. The radio base station 111 and the mobile station 112 constitute a CDMA system. On the other hand, the wireless base station 1
21 and the mobile station 122 constitute a TDMA system. Further, the control station 113 controls a radio base station of the CDMA system, and the control station 123 controls a radio base station of the TDMA system. FIG. 1 shows an example in which the radio base station of the CDMA system and the radio base station of the TDMA system are installed at geographically separated locations for convenience. However, the radio base station of the CDMA system and the radio base station of the TDMA system are not necessarily used. The base stations do not need to be located geographically apart.

FIG. 2 is a diagram for explaining a configuration example of a radio base station of a CDMA system, which constitutes a mobile communication system to which the present invention is applied. The base station transmitting / receiving device 1 is a device used for transmitting and receiving user information via radio, and includes a notch filter for reducing interference with a TDMA system. On the other hand, as a device for controlling the base station transmitting / receiving device 1, a common control device 2, a call processing control device 3, a control information control device 4, a memory 5, and a notch filter control device 6 are interconnected via a bus 7. ing. 8 is an exchange interface, and 9 is an antenna.

FIG. 3 is a diagram for explaining an example of the configuration of a radio base station of a TDMA system constituting a mobile communication system to which the present invention is applied. The base station transmitting / receiving device 11 is a device used for transmitting and receiving user information via radio. On the other hand, as devices for controlling the base station transmitting / receiving device 11, a common control device 12, a call processing control device 13, a control information control device 14, and a memory 15
6 are connected to each other. 17 is an exchange interface, and 18 is an antenna.

FIG. 4 is a diagram for explaining an example of the configuration of a mobile station of a CDMA system which constitutes a mobile communication system to which the present invention is applied. The mobile station transmitting / receiving device 21 is a device used for transmitting and receiving user information via radio, and includes a notch filter for reducing interference with a TDMA system. On the other hand, as a circuit for controlling the mobile station transmitting / receiving device 21, a common control circuit 22, a control information control circuit 23, a memory 24, and a notch filter control circuit 25 are mutually connected via a bus 26. 27 is a user interface, and 28 is an antenna.

A radio channel used in the TDMA system is transmitted from a radio base station belonging to the CDMA system to a radio channel.
An operation of the base station for notifying a mobile station belonging to the DMA system will be described. FIG. 5 is a flowchart showing the operation of the control device in the radio base station of the CDMA system. In this flowchart, a description will be given assuming that a radio channel used in the TDMA system is notified to a radio base station of the CDMA system via a higher control station of the CDMA system. In addition, as a method of knowing the radio channel used in the TDMA system, CDMA is used.
A method is possible in which the wireless base station of the system itself performs scanning over the entire wireless frequency band, but the same effect can be obtained by either method.

The common control device 2 transmits the TD from the higher control station.
Information about a radio channel used in the MA system is received (S1). The common control device 2 stores the received information in the memory 5 via the bus 7 (S2). next,
The common controller 2 controls the notch filter controller 6
A command to set the notch filter is issued (S3). The notch filter control device 6 having received the command transmits the TDMA
The information of the wireless channel used in the system is read (S4), and a notch filter is set based on the information (S5). Further, it notifies the common control device 2 that the setting of the notch filter is completed (S6). The common control device 2 instructs the control information control device 4 to set information to the control channel in parallel with the setting instruction to the notch filter control device 6 (S7). Upon receiving the command, the control information control device 4 reads out information on the wireless channel used in the TDMA system from the memory 5 (S5).
8) Then, information is set to the control channel based on the information (S9). Further, it notifies the common control device 2 that the setting has been completed (S10). Here, as a channel on which the control information control device 4 sets information of a radio channel used in the TDMA system, a broadcast channel used for broadcasting system information to a mobile station in a standby state, a communication channel, and the like. A control channel associated with a communication channel used for notifying control information to the mobile station in the middle is conceivable, but any method may be used. FIG. 6 shows an example of data stored in the memory 5.

Next, the radio channel used in the TDMA system is transmitted from the radio base station of the TDMA system to the CDMA.
TDMA for notifying a radio base station of a DMA system
The operation of the radio base station of the system will be described. FIG. 7 is a flowchart showing the operation of the control device in the radio base station of the TDMA system. In this flowchart, TD
A description will be given assuming that a radio channel used in the MA system is notified to a radio base station of the CDMA system via a higher control station of the TDMA system. In addition, the trigger of the change of the state of the radio channel used by the radio base station may be an incoming call to the mobile station, an outgoing call from the mobile station, a call termination, a handover between base stations, and the like. Since the present invention can be realized by the same operation, the present embodiment will be described by taking a case where a call arrives at a mobile station as an example. When the upper control station notifies the mobile station of an incoming call (S11), the common control device 12 calls the call processing control device 1
3 is instructed to call all at once (S12). The call processing control device 13 executes a general call process (S13),
When there is a response from the mobile station, the call processing control device 13 notifies the common control device 12 to that effect (S14). Further, the common control device 12 instructs the call processing control device 13 to perform a channel allocation process (S15), and the call processing control device 13 executes the channel allocation process (S16). When the channel assignment processing is completed, the call processing control device 13 stores the channel assignment result in the memory 15 (17) and, at the same time, notifies the common control device 12 of the fact (S18). Upon receiving the notification, the common control device 12 reads the channel usage status from the memory 15 (S19), and sends the data directly to the radio base station of the CDMA system or to the CDM via a higher control station.
Notification is made to the radio base station of the A system (S20). FIG. 8 shows an example of data stored on the memory 15.

Next, the operation of the mobile station of the CDMA system for notifying the radio channel used in the TDMA system from the mobile station of the CDMA system to the radio base station of the CDMA system will be described. FIG. 9 is a flowchart showing the operation of the control device in the mobile station of the CDMA system. This flowchart shows a case where information of a radio channel used in the TDMA system is notified from a radio base station of the TDMA system. In addition to this, as a method of knowing the radio channel used in the TDMA system, a method in which the mobile station performs scanning over the entire radio frequency band can be considered, and a similar effect can be obtained by any method. The control information control circuit 23 extracts control information from the control channel received from the radio base station of the TDMA system (S21), and notifies the common control circuit 22 of the result (S22). The common control circuit 22 extracts information on the radio channel used by the TDMA system from the obtained control information (S2).
3) Further, the extracted channel information is stored in the memory (S24). Subsequently, the common control circuit 22 instructs the notch filter control circuit 25 to set a notch filter (S25). The notch filter control circuit reads the channel information from the memory (S26), and executes the setting of the notch filter (S27). Further, it notifies the common control circuit 22 that the setting is completed (S28). The common control circuit 22 instructs the control information control circuit 23 to set the control information in parallel with the instruction to set the filter (S29). The control information control circuit 23 reads the channel information from the memory 24 (S30) and sets the control information (S31). As a method of transmitting the channel information set as control information to the radio base station of the CDMA system, if the mobile station is communicating, the channel information is transmitted to the radio base station of the CDMA system via the control channel attached to the communication channel. I do. If the mobile station is waiting, for example, when the mobile station enters a communication state, CDMA
Various methods are conceivable, such as transmission to the wireless base station, but the same effect can be obtained by any of the methods. Further, the control information control circuit 23 notifies the common control circuit 22 of the completion of the setting of the control information (S3
2). FIG. 10 shows an example of data stored on the memory 24.

Next, a radio channel used in the TDMA system is transmitted from a radio base station of the TDMA system to C
TD for notifying the mobile station of the DMA system
The operation of the control device of the radio base station of the MA system will be described. FIG. 11 is a flowchart showing the operation of the control device in the radio base station of the TDMA system. In addition, the trigger of the change of the state of the wireless channel used by the wireless base station may be an incoming call to the mobile station, an outgoing call from the mobile station, an end call, a handover between base stations, and the like. Since the present invention can be realized by the same operation, the present embodiment will be described by taking a case where a call arrives at a mobile station as an example. When the incoming call from the higher control station to the mobile station is notified (S41), the common control device 12
(S42). The call processing control device 13 executes a general call (S43), and when there is a response from the mobile station, the call processing control device 13 notifies the common control device 12 of the response (S44). Further, the common control device 12 instructs the call processing control device 13 to perform a channel allocation process (S45), and the call processing control device 13 executes the channel allocation process (S46). When the channel assignment process is completed, the call processing control device 13 stores the channel assignment result in the memory 15 (S47) and, at the same time, notifies the common control device 12 of the fact (S48). Upon receiving the notification, the common control device 12 instructs the control information control device 14 to set channel information for notifying the mobile station (S4).
9). Upon receiving the command, the control information control device 14 reads the channel information to be set from the memory 15 (S50),
The information is set to the control channel (S51). Further, the common control device 12 is notified that the setting has been completed (S52). The setting of this control information is, for example, TD
This is performed on a broadcast channel for broadcasting system information of the MA system to the mobile station. FIG. 12 shows an example of data stored on the memory.

In this embodiment, a case is described in which a radio channel actually used in a TDMA system is notified to a radio base station or a mobile station of the CDMA system when the state of the channel changes, and a notch filter is set based on the notification. Although described, this is not a limitation of the embodiments of the present invention. For example, irrespective of whether the TDMA system is in use or idle, a radio channel allocated to the TDMA system is notified to a radio base station or a mobile station of the CDMA system, and a notch filter is set based on the notification. It may be configured to set. Also, the timing of the notification need not necessarily be performed at the time when the state of the wireless channel changes, and it may be configured to notify the wireless base station or mobile station of the CDMA system, for example, at regular time intervals. Further, the wireless base station or the mobile station of the CDMA system uses the notified wireless channel information and the result of the autonomous scan together, such as performing a scan based on the notified wireless channel information. May be configured. In any case, the present invention can be applied, and the same effects can be obtained.

[0030]

As described above in detail, the first mobile communication system constituted by a plurality of radio base stations and a plurality of mobile stations communicating therewith, and a radio system narrower than the first mobile communication system. In a mobile communication system in which a second mobile communication system configured by a plurality of radio base stations and a plurality of mobile stations that communicate with each other using a frequency band shares the same radio frequency band, the second mobile communication A radio base station belonging to the first mobile communication system is provided with means for notifying a radio channel used in the system to a mobile station belonging to the first mobile communication system, or A radio channel used in a mobile communication system is changed from a radio base station belonging to the second mobile communication system to a radio base station belonging to the first mobile communication system. Or a radio base station belonging to the first mobile communication system, wherein a mobile station belonging to the first mobile communication system transmits a radio channel used in the second mobile communication system. A means for notifying a station, or a radio base station belonging to the second mobile communication system belonging to the second mobile communication system to a radio channel used in the second mobile communication system belongs to the first mobile communication system A means for notifying the mobile station, or a means for setting the notch filter of the radio base station based on the notified information of the radio channel used in the second mobile communication system. Or the notch filter of the mobile station is used in the notified second mobile communication system. The first mobile communication system and the second mobile communication system share the same radio frequency band, thereby improving communication quality in both systems. Or the capacity of the accommodating subscriber can be greatly increased.

[Brief description of the drawings]

FIG. 1 is a diagram illustrating a configuration example of a mobile communication system to which the present invention is applied.

FIG. 2 is a diagram illustrating an example of a wireless base station device used in a CDMA mobile communication system.

FIG. 3 is a diagram illustrating an example of a radio base station device used in a TDMA mobile communication system.

FIG. 4 is a diagram illustrating an example of a mobile station device used in a CDMA mobile communication system.

FIG. 5 is a flowchart illustrating an operation of a control device in a wireless base station of the CDMA system.

FIG. 6 is a diagram illustrating an example of data on a memory in a wireless base station of the CDMA system.

FIG. 7 is a flowchart showing an operation of a control device in a radio base station of the TDMA system.

FIG. 8 is a diagram illustrating an example of data on a memory in a wireless base station of the TDMA system.

FIG. 9 is a flowchart showing an operation of a control device in a mobile station of the CDMA system.

FIG. 10 is a diagram illustrating an example of data on a memory in a mobile station of a CDMA system.

FIG. 11 is a flowchart showing an operation of a control device in a radio base station of the TDMA system.

FIG. 12 is a diagram illustrating an example of data on a memory in a wireless base station of the TDMA system.

FIG. 13 is a diagram illustrating an example of interference caused by a CDMA signal to a TDMA signal.

FIG. 14 is a diagram illustrating an example of interference of a TDMA signal to a CDMA signal.

FIG. 15 is a diagram illustrating reduction of interference by a notch filter.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Base station transmission / reception apparatus 2 Common control apparatus 3 Call processing control apparatus 4 Control information control apparatus 5 Memory 6 Notch filter control apparatus

────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-6-350524 (JP, A) JP-A-4-215327 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) H04B 7/24-7/26 102 H04Q 7/00-7/38

Claims (14)

(57) [Claims] 1. A first mobile communication system comprising a plurality of radio base stations and a plurality of mobile stations communicating therewith, and mutually using a radio frequency band narrower than the first mobile communication system. A second mobile communication system configured by a plurality of wireless base stations and a plurality of mobile stations that perform communication is a mobile communication system that shares the same radio frequency band, and is used in the second mobile communication system. a channel, said means for first radio base station belonging to the mobile communication system notifies the mobile station belonging to the first mobile communication system, notch of the radio base station belonging to the first mobile communication system
Filter the second transfer obtained by the notification.
Based on information on wireless channels used in mobile communication systems.
And a setting means for setting . 2. A first mobile communication system comprising a plurality of radio base stations and a plurality of mobile stations communicating therewith, and mutually using a radio frequency band narrower than the first mobile communication system. A second mobile communication system configured by a plurality of wireless base stations and a plurality of mobile stations that perform communication is a mobile communication system that shares the same radio frequency band, and is used in the second mobile communication system. a channel, said means for first radio base station belonging to the mobile communication system notifies the mobile station belonging to the first mobile communication system, Notchifu of mobile stations belonging to the first mobile communication system
The second mobile communication obtained by the notification.
Based on information of wireless channels used in communication systems
And a setting means . 3. A plurality of radio base stations and a plurality of radio base stations communicating therewith.
Mobile communication system comprising a number of mobile stations
And a radio frequency narrower than the first mobile communication system
Multiple base stations and multiple base stations that communicate with each other using bandwidth
Mobile communication system constituted by mobile stations of
Mobile communication systems that share the same radio frequency band
Thus, the radio base station belonging to the first mobile communication system performs scanning autonomously, thereby providing a means for knowing a radio channel used in the second mobile communication system.
A radio channel used in the second mobile communication system
Is a radio base station belonging to the first mobile communication system.
Communication with mobile stations belonging to the first mobile communication system.
And means for notifying a radio base station belonging to the first mobile communication system.
Filter by the notification or the scan.
Radio link used in the second mobile communication system
Means for setting based on channel information . 4. A plurality of radio base stations and a plurality of radio base stations communicating therewith.
Mobile communication system comprising a number of mobile stations
And a radio frequency narrower than the first mobile communication system
Multiple base stations and multiple base stations that communicate with each other using bandwidth
Mobile communication system constituted by mobile stations of
Mobile communication systems that share the same radio frequency band
Thus, the radio base station belonging to the first mobile communication system performs scanning autonomously, thereby providing a means for knowing a radio channel used in the second mobile communication system.
A radio channel used in the second mobile communication system
Is a radio base station belonging to the first mobile communication system.
Communication with mobile stations belonging to the first mobile communication system.
And a notch for a mobile station belonging to the first mobile communication system.
Filter obtained by the notification or the scan
Wireless channel used in the second mobile communication system
Means for setting based on the information of the mobile communication system. 5. A first mobile communication system including a plurality of radio base stations and a plurality of mobile stations communicating therewith, and mutually communicating using a radio frequency band narrower than the first mobile communication system. A second mobile communication system configured by a plurality of radio base stations and a plurality of mobile stations performing the same is a mobile communication system sharing the same radio frequency band, and a radio channel used in the second mobile communication system The mobile base station belonging to the second mobile communication system to the wireless base station belonging to the first mobile communication system. 6. The second mobile communication system according to claim 5 , wherein the radio base station belonging to the first mobile communication system is based on information notified from a radio base station belonging to the second mobile communication system. A mobile communication system which autonomously scans a wireless channel used in a system. 7. A first mobile communication system including a plurality of radio base stations and a plurality of mobile stations communicating therewith, and mutually communicating using a radio frequency band narrower than the first mobile communication system. A second mobile communication system configured by a plurality of radio base stations and a plurality of mobile stations performing the same is a mobile communication system sharing the same radio frequency band, and a radio channel used in the second mobile communication system Means that a mobile station belonging to the first mobile communication system notifies a radio base station belonging to the first mobile communication system,
Filter the second transfer obtained by the notification.
Based on information on wireless channels used in mobile communication systems.
And a setting means for setting . 8. A first mobile communication system including a plurality of radio base stations and a plurality of mobile stations communicating therewith, and mutually communicating using a radio frequency band narrower than the first mobile communication system. A second mobile communication system configured by a plurality of radio base stations and a plurality of mobile stations performing the same is a mobile communication system sharing the same radio frequency band, and a radio channel used in the second mobile communication system the said means for the mobile station belonging to the first mobile communication system notifies the radio base station belonging to the first mobile communication system, Notchifu of mobile stations belonging to the first mobile communication system
The second mobile communication obtained by the notification.
Based on information of wireless channels used in communication systems
And a setting means . 9. A plurality of radio base stations and a plurality of radio base stations communicating therewith.
Mobile communication system comprising a number of mobile stations
And a radio frequency band narrower than the first mobile communication system
Wireless base stations that communicate with each other using
The second mobile communication system composed of mobile stations is the same
Mobile communication system sharing the same radio frequency band.
The mobile station belonging to the first mobile communication system has means for knowing a radio channel used in the second mobile communication system by performing autonomous scanning.
And a radio channel used in the second mobile communication system.
A mobile station belonging to the first mobile communication system
Communication with the radio base station belonging to the first mobile communication system
And means for notifying a radio base station belonging to the first mobile communication system.
Filter by the notification or the scan.
Radio link used in the second mobile communication system
Means for setting based on channel information . 10. Communication with a plurality of radio base stations
A first mobile communication system constituted by a plurality of mobile stations
And a radio frequency band narrower than the first mobile communication system
Wireless base stations that communicate with each other using
The second mobile communication system constituted by mobile stations is the same.
A mobile communication system that shares one radio frequency band
The mobile station belonging to the first mobile communication system has means for knowing a radio channel used in the second mobile communication system by performing autonomous scanning.
And a radio channel used in the second mobile communication system.
A mobile station belonging to the first mobile communication system
Communication with the radio base station belonging to the first mobile communication system
And a notch for a mobile station belonging to the first mobile communication system.
Filter obtained by the notification or the scan
It was no line channel used by the second mobile communication system
A mobile communication system characterized by comprising means for setting based on the information of a file . 11. A first mobile communication system comprising a plurality of radio base stations and a plurality of mobile stations communicating therewith, and mutually communicating using a radio frequency band narrower than the first mobile communication system. A second mobile communication system configured by a plurality of radio base stations and a plurality of mobile stations performing the same is a mobile communication system sharing the same radio frequency band, and a radio channel used in the second mobile communication system The mobile base station belonging to the second mobile communication system to the mobile station belonging to the first mobile communication system. 12. The second mobile communication system according to claim 11, wherein the mobile station belonging to the first mobile communication system is based on information notified from a radio base station belonging to the second mobile communication system. A mobile communication system, which autonomously scans a radio channel used in a mobile communication system. 13. The second mobile station according to claim 5, wherein the notch filter of the radio base station belonging to the first mobile communication system is obtained by the notification or the scan. A mobile communication system comprising: means for setting based on information of a wireless channel used in a communication system. 14. The second mobile communication according to claim 5, wherein the notch filter of the mobile station belonging to the first mobile communication system is obtained by the notification or the scan. A mobile communication system comprising: means for setting based on information of a wireless channel used in the system.