JP2002374552A - Communication controller and control method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a communication control method and a controller where the communication quality of each channel is hardly deteriorated even in the case that a multiplex transmission line is adopted for a transmission line between a base station controller and a base station. SOLUTION: The communication controller of this invention is provided with a detection means that detects a reduced band of a 1st transmission line that is provided between a plurality of mobile terminals and another controller, multiplexes a plurality of channels passing through a 1st base station between the 1st base station and the other controller, a selection means that selects one of a plurality of the channels when the detection means detects the reduced band of the 1st transmission line, and a changeover control means that applies switch control of the selected channel into a channel passing through a 2nd transmission line between a 2nd base station and the other controller.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for, when a band is reduced due to a failure or the like in a transmission path between a base station and a base station controller, changing the communication destination of a mobile station communicating with the base station to another base station. The present invention relates to a communication control method and a communication control device for switching to a base station.

[0002]

2. Description of the Related Art FIG. 13 is a configuration diagram illustrating a general mobile communication network. In the figure, 2 is a base station controller, 3 is a transmission path, 4 is a base station, and 5a to 5c are mobile units. The base station 4 wirelessly communicates with the mobile devices 5a to 5c located within the communicable range 6, and the base station controller 2 communicates with the base station 4 via the transmission path 3. Here, the communicable range 6 indicates the position of a mobile device that can communicate with the base station 4.

In recent years, as a transmission path 3 between the base station controller 2 and the base station 4, for example, ATM (Asynchronous Transfer) has been used.
Mode: Asynchronous transmission mode) or IMA (Inverse Multiple
xing for ATM) and the like. Multiplex communication is a communication method in which a plurality of channels share a predetermined band. According to this, even if the amount of transmission information of each channel fluctuates with time, the sum of the amount of transmission information of each channel is reduced. Since the temporal smoothing is performed, it is possible to provide a plurality of channels in a band smaller than the sum of the maximum values (peak values) of the bands required by each channel. The effect of such multiplex communication is called a statistical multiplex effect.

[0004]

As described above, a multiplex transmission line having a statistical multiplexing effect has been used as a transmission line between a base station controller and a base station. However, when such a transmission path is employed, when a failure occurs in a part of the transmission path, the band between the base station control device and the base station is reduced, and the communication quality is reduced or the communication can be continued. There was a problem that it disappeared.

In particular, in multiplex communication, when the band is reduced and the band becomes insufficient, there is a problem that the communication quality is reduced simultaneously in all or many channels because each channel shares the band. .

The present invention has been made in view of the above-mentioned problems, and the communication quality of each channel is not easily reduced even when the transmission path between the base station controller and the base station is a multiplex transmission path. A communication control method and a communication control device are provided.

[0007]

In a communication control apparatus according to the present invention, a plurality of channels provided between a plurality of mobile stations and another apparatus and passing through a first base station are connected to the first base station.
A first transmission path multiplexed between the base station and the other device, detecting means for detecting a decrease in the band, and detecting the decrease in the band in the first transmission path by the detection means. Selecting means for selecting any one of the plurality of channels; and providing the selected channel between a second base station and the other device by using a second
And switching control means for performing control to switch to a channel passing through the transmission path.

In the communication control apparatus according to the present invention, the other apparatus controls the first and second base stations and stores information on the plurality of channels required for the control. Station control device,
The selection means selects one of the channels based on the information on the plurality of channels stored by the base station control device.

Further, in the communication control apparatus according to the present invention, the base station control apparatus controls connection of the plurality of channels when the plurality of mobile stations make and receives calls and information necessary for the control. Is stored as information on the plurality of channels.

In the communication control device according to the present invention, the communication control device is provided integrally with the base station control device.

Further, in the communication control device according to the present invention, the selection means is assigned to a mobile station having no channel passing through a base station other than the first base station from among the plurality of channels. Channel that has priority.

Further, in the communication control device according to the present invention, the selecting means selects a channel based on a communication time of the plurality of channels.

[0013] In the communication control apparatus according to the present invention, the selecting means may be configured such that, of the plurality of channels, a band used on the first transmission line is smaller than a vacant band on the second transmission line. Select channel preferentially.

In the communication control apparatus according to the present invention, the selecting means preferentially selects a quality-guaranteed channel over a non-quality-guaranteed channel.

Further, in the communication control device according to the present invention, the selecting means preferentially selects a channel having relatively poor communication quality from the plurality of channels.

Further, in the communication control device according to the present invention, the selection means selects a channel based on the communication quality of the plurality of channels measured in each of the plurality of mobile devices.

Further, in the communication control device according to the present invention, the selecting means selects a channel based on the communication quality of the plurality of channels measured by the first base station.

Further, in the communication control device according to the present invention, the selecting means selects a channel based on the size of the band used in the first transmission path.

Further, in the communication control device according to the present invention, an available bandwidth of a transmission line provided between each base station and the other device is selected from a plurality of base stations different from the first base station. Any of the base stations is selected based on the size of the base station, and the selected base station is set as the second base station.

Further, in the communication control apparatus according to the present invention, when each base station performs CDMA communication with a mobile station, the transmission control provided between each base station and the other apparatus is provided. The free band of the road is recognized by the Resource Status Indication message transmitted from each of the base stations.

In the communication control apparatus according to the present invention, each channel provided between the mobile station and another apparatus and passing through a first base station is connected to the mobile station and the first base station. , And a wired channel provided between the first base station and the other device, and transmits communication data between the mobile device and the other device. .

Further, in the communication control apparatus according to the present invention, the communication data between the first base station and a plurality of mobile stations communicating with the first base station is transmitted to the first base station and the other mobile stations. Regarding a first transmission path for multiplexing and transmitting with a device,
Detecting means for detecting a decrease in the band, and when the detecting means detects a decrease in the band in the first transmission line, any one of the plurality of mobile devices communicating with the first base station is selected. Selecting means for selecting a mobile device, and switching control means for performing control for switching a communication destination of the selected mobile device to a second base station capable of communicating with the other device via a second transmission path; Is provided.

Further, in the communication control method according to the present invention, the communication control method is provided between a plurality of mobile devices and another device,
A first transmission path for multiplexing a plurality of channels passing through a first base station between the first base station and the other device detects a decrease in a band, and the detecting unit detects the first channel. When detecting a decrease in the band in the transmission path, select any one of the plurality of channels,
Control is performed to switch the selected channel to a channel provided between the second base station and the other device and passing through a second transmission path.

[0024]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment 1

FIG. 1 is a configuration diagram illustrating a communication system according to the first embodiment. In the figure, 1 is a communication control device,
2 is a base station controller, 3a is a first transmission path, and 4a is a first transmission path.
, 3b is a second transmission path, 4b is a second base station,
5a to 5d are mobile devices, and 6a and 6b are communicable ranges. The communication control device 1 includes a band detection unit 11 and a determination unit 12
, A switching channel selector 13 and a switching controller 14.

The mobile stations 5a to 5c communicate with the first base station 4a, and the mobile station 5d communicates with the second base station 4b. The base station control device 2 controls the first and second base stations 4a and 4b, and also controls the mobile stations 5a to 5 through the base stations 4a and 4b.
Communicate with d. The first and second transmission lines 3a and 3b are statistical multiplex transmission lines such as ATM and IMA. The mobile device 5c can communicate with both base stations 4a and 4b.

The operation will be described. First base station 4a
Multiplexes data transmitted from the mobile devices 5a to 5c existing in the communicable range 6a and outputs the multiplexed data to the first transmission path 3a. The first transmission path 3a transmits the multiplexed data to the base station controller 2. Base station controller 2
Returns the transmitted multiplexed data to data for each mobile station, and outputs the data to a mobile communication network or a public network (not shown).

Further, the base station controller 2 controls each mobile station 5 transmitted from a mobile communication network or a public network (not shown).
It multiplexes the data addressed to a to 5c and outputs it to the first transmission line 3a. The first transmission path 3a transmits the multiplexed data to the first base station 4a. First base station 4a
Returns the transmitted multiplexed data to data for each mobile station, and transmits the data to each of the mobile stations 5a to 5c via a wireless channel.

Similarly, the second transmission line 3b multiplexes communication data transmitted / received by mobile units existing within the communicable range 6b, and transmits the multiplexed data from the second base station 4b to the base station controller 2.
Alternatively, the signal is transmitted from the base station control device 2 to the second base station 4b.

Now, due to a failure or the like, the first transmission path 3a
, That is, the bandwidth in the first transmission path 3a is reduced. At this time, the communication control device 1 illustrated in FIG. 1 performs control for switching any one of the mobile devices 5a to 5c from the first base station 4a to the second base station 4b. Here, among the mobile devices 5a to 5c, only the mobile device 5c can communicate with the second base station 4b, so that the communication partner of the mobile device 5c is the first base station 4a.
To the second base station 4b.

This will be described in more detail. FIG. 2A is an explanatory diagram illustrating a communication state in the communication system illustrated in FIG. In the figure, reference numeral 71 denotes an information channel allocated between the mobile station 5c and the base station controller 2.
The information channel 71 includes a wireless channel 711 allocated between the mobile station 5c and the first base station 4a, and a wired channel 712 allocated between the first base station 4a and the base station controller 2. It is composed of The information channel 71 is multiplexed on the first transmission path 3a with an information channel (not shown) allocated to the mobile devices 5a and 5b.

Now, due to a failure or the like, the first transmission path 3a
When the band in has decreased, the communication control device 1 performs a process as shown in FIG. In FIG. 3, S1 to S5 are processes performed by the communication control device 1. First, the band detector 11 shown in FIG. 1 detects a decrease in the band in the first transmission line 3a (S1 in FIG. 3). Such a decrease in band can be detected using any method. For example, it can be detected by detecting a failure of the first transmission line 3a or the first base station 4a. Alternatively, a decrease in the communication quality of the first transmission path 3a may be detected, and this may be regarded as a decrease in the band. Alternatively, the decrease in the band may be recognized based on known information such as maintenance and inspection timing.

When a decrease in the band of the first transmission line 3a is detected, the determination unit 12 shown in FIG. 1 determines whether or not communication will be hindered in each information channel passing through the first transmission line (see FIG. 1). 3 S2). For example, in the information channel 71 shown in FIG. 2A, it is determined whether a decrease in communication quality is expected or has not already occurred. If it is determined that there is no obstacle to communication, the communication control device 1
Is completed. (S5 in FIG. 3)

On the other hand, if it is determined that the communication quality is reduced in at least one of the information channels allocated to the mobile devices 5a to 5c, the switching channel selector 13 shown in FIG. An information channel satisfying the following conditions and conditions is selected from the channels (S3 in FIG. 3). Condition: a base station (for example, base station 4b: hereinafter, referred to as a switching destination base station) other than a base station (for example, base station 4a: hereinafter, referred to as a communicating base station) connected to a transmission path with a reduced band.
An information channel assigned to a mobile station (for example, mobile device 5c) that can communicate with the mobile station. Condition: The transmission path between the switching destination base station and the base station control device has an available band sufficient to provide a new information channel. The number of information channels to be selected may be one or more.

In the following, the switching channel selector 13 will be described with reference to FIG.
The case where the information channel 71 shown in (a) is selected will be described. The mobile station 5c to which the information channel 71 has been allocated can communicate with the two base stations 4a and 4b, and the second transmission path 3b has enough free space for setting a new information channel. It is assumed that a band exists.

The switching channel selector 13 shown in FIG. 1 is used to switch the information channel 7 passing through the base station 4a shown in FIG.
When 1 is selected, the switching control unit 14 shown in FIG. 1 controls the base station controller 2 to switch the information channel 71 shown in FIG. 2A to the information channel 72 as shown in FIG. 2B. (S4 in FIG. 3). FIG. 4 is a sequence diagram illustrating the details of the switching process from the information channel 71 to the information channel 72 (S4 in FIG. 3). In FIG. 4, S41-S
49 is each processing.

First, the base station controller 2 transmits a channel switching request to the second base station 4b in response to an instruction from the switching control unit 14 shown in FIG. 1 (S41 in FIG. 4). Upon receiving this, the second base station 4b communicates with the base station controller 2 and the mobile station 5
Then, a new information channel 72 passing through the second base station 4b is set between the communication channel and the channel c (S42 in FIG. 4). Further, the second base station 4b notifies the base station controller 2 of the completion of the new channel setting (S43 in FIG. 4), and transmits a channel switching request to the mobile device 5c (FIG. 4). S
44). Upon receiving this, the mobile station 5c sets the channel used for communication with the base station controller 2 to the current information channel 7
1 to the information channel 72 (FIG. 4)
S45), and transmits a switch completion notification to the base station 4b (S46 in FIG. 4). The base station 4b transmits the switching completion notification transmitted from the mobile device 5c to the base station control device 2 (FIG. 4).
S47). In response to this, the base station controller 2 switches the communication path with the mobile device 5c from the current information channel 71 to the information channel 72 (S4 in FIG. 4).
8). This completes the switching (S5 in FIG. 3, FIG. 4
S49). Here, the information channel refers to a channel for flowing communication data such as voice.

As described above, in the first embodiment, the transmission path provided between the base station control device and the base station suffers a failure or performance degradation, and the base station control via the transmission path. When the communication quality between the device and the mobile device deteriorates, the communication path between the base station control device and the mobile device is switched, so that the communication quality between the base station control device and the mobile device can be prevented from lowering.

In particular, in a communication system in which the transmission path provided between the base station controller and the base station is a multiplex transmission path, a decrease in the band of the multiplex transmission path is detected, and the mobile station becomes a communication partner. Since the base station is switched, a decrease in communication quality between the base station control device and the mobile device can be suppressed.

Embodiment 2 In Embodiment 2, the base station control device 2 and the communication control device 1 shown in FIG. 1 share information about each mobile station. FIG. 5 is a schematic configuration diagram illustrating main parts of the base station controller 2 and the communication controller 1. In the figure, the same or corresponding parts as those in FIG. As illustrated, the base station control device 2 includes a base station control unit 21, a management database 22, and a relay unit 23.

The operation will be described. Base station controller 21
Controls the plurality of base stations 4a and 4b shown in FIG. 1 and controls each of the mobile stations 5a to 5d via them. For example, the base station control unit 21 transmits each of the mobile devices 5a to 5a to
It performs outgoing / incoming connection control, call termination control, diversity handover control, and the like for 5d. Here, the diversity handover refers to a process of selectively combining signals transmitted from the same mobile station via a plurality of paths (a plurality of base stations), or the reverse process.

In addition, these outgoing / incoming connection control, call termination control,
Information required for performing the diversity handover control is managed and stored in the management database 22. For example, information indicating how much free bandwidth is present in each of the transmission paths 3a and 3b is necessary when performing outgoing / incoming call control, and is always managed and stored in the management database 22. Information on which mobile station is communicating with which base station and information on which mobile station can communicate with which base station are also required for performing diversity handover control.・ It is memorized. Also, the relay unit 23 transmits data from each mobile station transmitted via the base station to another base station, a public network, or the like, and performs the reverse process.

In the second embodiment, the switching channel selector 13 of the communication controller 1 refers to the management database 22 of the base station controller 2 when selecting a channel. More specifically, the switching channel selection unit 13
Information about each mobile device required when selecting a mobile device that satisfies the above conditions and is obtained from the management database 22 of the base station control device 2.

As described above, by sharing a database for managing and storing information relating to the mobile station between the base station control device and the communication control device, it is not necessary to separately provide the database in the communication control device. The control device can be reduced in size and cost. In addition, if the base station control device and the communication control device are integrally configured, further reduction in size and cost can be achieved.

Embodiment 3 In the first embodiment, the switching channel selection unit 13 shown in FIG. 1 selects an information channel that satisfies the above conditions and conditions. In the fourth embodiment, the switching channel selector 13 selects an information channel satisfying the above conditions and the following conditions. Condition: An information channel assigned to a mobile station having no information channel with another base station (a base station different from the communicating base station) is preferentially selected.

Hereinafter, taking the communication state shown in FIG. 6 as an example,
This will be specifically described. 6, the same or corresponding parts as those in FIG. 1 are denoted by the same reference numerals, and description thereof will be omitted. Here, the mobile devices 5c and 5e can communicate with both the base stations 4a and 4b. The mobile device 5c communicates with both the base stations 4a and 4b, and the mobile device 5e communicates only with the base station 4a.

FIG. 7A is a schematic diagram for explaining the communication state shown in FIG. In the figure, the same or corresponding parts as those in FIG. Here, the information channel 73 is allocated to the mobile device 5e,
Information channels 74 and 75 are assigned to mobile station 5c. The information channel 73 is an allocated radio channel 731 between the mobile station 5e and the first base station 4a.
And a wired channel 732 allocated between the first base station 4a and the base station controller 2. The information channel 74 is a radio channel 741 allocated between the mobile device 5c and the first base station 4a.
And a wired channel 742 allocated between the first base station 4a and the base station controller 2. The information channel 75 is a radio channel 751 allocated between the mobile device 5c and the second base station 4b.
And a wired channel 752 allocated between the second base station 4b and the base station controller 2.
The channel 732 and the channel 742 are multiplexed on the first transmission line 3a shown in FIG.

Further, the base station controller 2 controls each mobile station 5c.
And information channels 73-75 assigned to 5e. More specifically, each information channel 73
To channels 751, 732, and 74 constituting the channels 75 to 75
1,742,751 and 752 are recognized. Further, the base station control device 2 recognizes the vacant bands of the transmission lines 3a and 3b. Here, the second transmission path 3b
Above, it is assumed that there is a free band enough to newly set only one information channel.

Now, the first transmission line 3a
Is reduced. At this time, the communication control device 1 illustrated in FIG. 6 performs each process illustrated in FIG.
The communication state shown in FIG. 7A is switched to the communication state shown in FIG. FIG. 8 differs from FIG. 3 in that a process S6 is provided instead of the process S4. More specifically, in processing S4 shown in FIG. 3, an information channel satisfying the above conditions and conditions is selected, whereas in processing S6 shown in FIG. 8, an information channel satisfying the above conditions and conditions is selected. . Other processing, S
1, S2, S4, and S5 are the same as those in FIG.

This will be described in detail with reference to FIGS. When the transmission capacity of the first transmission line 3a is reduced, each of the information channels 73 and 7 using the first transmission line 3a as a communication path.
4 is switched to the second transmission path 3b, it is possible to suppress a decrease in communication quality in the first transmission path 3a. However, here, the second transmission path 3b has only an empty band enough to newly set only one information channel, and only one of the information channels 73 and 74 is on the second transmission path 3b. Can not switch to Incidentally, the mobile device 5c has an information channel 75 via the second transmission path 3b in addition to the information channel 74. Even if communication via the information channel 74 becomes impossible, the mobile device 5c receives the information channel 75 via the information channel 75. Communication is possible. On the other hand, the mobile device 5e has only the communication means with the base station control device 2 only for the information channel 73, and if the communication using the information channel 73 becomes impossible, the mobile device 5e cannot communicate with the base station control device 2. Therefore, in the third embodiment, in the process S3 shown in FIG. 3, the information channel 73 is preferentially selected as a switching candidate.

As described above, according to the processing shown in FIG.
Even if the processing does not solve the shortage of the band on the transmission path 3a and does not improve the communication quality on the transmission path 3a, both the mobile devices 5c and 5e can secure the information channel passing through other than the transmission path 3a. Can be suppressed.

As described above, in the third embodiment,
Since the communication path of a mobile station having no information channel with another base station is preferentially switched, it is possible to suppress a decrease in communication quality in each mobile station.

Embodiment 4 In the first embodiment, the switching channel selection unit 13 shown in FIG. 1 selects an information channel that satisfies the above conditions and conditions. In the fourth embodiment, the switching channel selector 13 selects an information channel satisfying the above conditions and the following conditions. Condition: When there are a plurality of information channels satisfying the above conditions and the conditions, the channel is selected based on the communication time (or time) of each information channel.

Hereinafter, taking the communication state shown in FIG. 9 as an example,
This will be specifically described. Here, both the mobile devices 5c and 5e can communicate with any of the base stations 4a and 4b. Also, both the mobile devices 5c and 5e are communicating only with the first base station 4a.

FIG. 10A is a schematic diagram for explaining the communication state shown in FIG. In the figure, the same or corresponding parts as those in FIG. Here, the information channel 73 is allocated to the mobile device 5e,
The information channel 74 is assigned to the mobile device 5c.

Further, the base station controller 2 controls each mobile station 5c.
And information channels 73 and 7 assigned to 5e
4 and the communication time of each of the information channels 73 and 74 is measured. Here, the communication time is, for example, an elapsed time from the time of connection of the information channel 73 or 74 to the transmission / reception. Further, the base station control device 2 recognizes the vacant bands of the transmission lines 3a and 3b shown in FIG. Here, it is assumed that there is an available band on the second transmission line 3b such that only one information channel can be newly set.

Now, due to a failure or the like, the first transmission path 3a
Is reduced. At this time, the communication control device 1 illustrated in FIG. 9 switches the communication state illustrated in FIG. 10A to the communication state illustrated in FIG. 10B by performing the processes illustrated in FIG. Note that FIG. 11 differs from FIG. 3 in that a process S7 is provided instead of the process S4. More specifically, in processing S4 shown in FIG. 3, an information channel that satisfies the above conditions and is selected.
The process S7 shown in FIG. 1 is different in that an information channel that satisfies the above conditions and is selected. Other processes, S1, S2, S4, and S5, are the same as those in FIG.

A specific description will be given. Here, the information channels 73 and 74 satisfy the above conditions and conditions. However, there is only an available band on the second transmission line 3b enough to newly set only one information channel, and only one of the information channels 73 and 74 is switched to the second transmission line 3b. Can not do.
Therefore, in the fourth embodiment, the information channel 7
The information channel with the longer communication time (communication time, connection time) is preferentially switched among 3, 74. For example, as shown in FIG. 10, when the communication time of the information channel 73 is longer than that of the information channel 74, the information channel 73 is preferentially switched to the information channel 76 on the second transmission path 3b.

It should be noted that the information channel having the shorter communication time may be preferentially switched, and whether the communication time is shorter or longer is arbitrary. Further, the communication time of each information channel can be easily known from data managed by the base station controller 2 for connection control of outgoing / incoming calls.

As described above, in the fourth embodiment, since the information channel to be switched is determined based on the length of the communication time of each information channel, the quality of the provided service due to the deterioration of the communication quality is suppressed. be able to.

Embodiment 5 In the first embodiment, the switching channel selection unit 13 shown in FIG. 1 selects an information channel that satisfies the above conditions and conditions. In the fifth embodiment, the switching channel selector 13 selects an information channel satisfying the above conditions and the following conditions. Condition: Select an information channel whose use band is smaller than the free band of the transmission path between the switching destination base station and the base station controller. That is, in the process S3 shown in FIG. 3, an information channel satisfying the above conditions and is selected. Other processes are the same as those in FIG.

Specifically, in the example shown in FIG.
When the band of the information channel 73 is smaller than the free band of the second transmission line 3b and the band of the information channel 74 is larger than the free band of the second transmission line 3b, the information channel 73 is preferentially transferred to the second transmission line. Information channel 7 on road 3b
Switch to 6.

As described above, in the fifth embodiment, the information channel on the first transmission line 3a having a smaller use band than the free band on the second transmission line 3b is preferentially assigned to the second transmission line. Since the switching is performed on the road, a decrease in communication quality can be suppressed.

Embodiment 6 FIG. In the first embodiment, the switching channel selection unit 13 shown in FIG. 1 selects an information channel that satisfies the above conditions and conditions. In the sixth embodiment, the switching channel selector 13 selects an information channel satisfying the above conditions and the following conditions. Conditions: Best effort type (non-guaranteed type, best eff
ort) information channel of guarantee type (guarantee type) is preferentially selected over the information channel of (ort). That is, in the process S3 shown in FIG. 3, an information channel satisfying the above conditions and is selected. Other processes are the same as those in FIG.

Here, the best-effort type is a method that does not guarantee the communication quality, for example, a method in which the communication speed changes depending on the state of the communication path. Another name, it is also called the band effort securing type. On the other hand, the guarantee type is a communication method that guarantees communication quality.

Specifically, in the example shown in FIG.
When the information channel 73 is a guarantee type and the information channel 74 is a best effort type, the guarantee type information channel 73 is preferentially given to the second transmission line 3.
Switch to information channel 76 on b. Note that even if the communication is temporarily disabled in the best-effort information channel 74, the guarantee is not limited.

As described above, in the sixth embodiment, the guarantee-type information channel is preferentially switched to another transmission path rather than the best-effort type, so that a decrease in communication quality can be suppressed.

Embodiment 7 In the first embodiment, the switching channel selection unit 13 shown in FIG. 1 selects an information channel that satisfies the above conditions and conditions. In the seventh embodiment, the switching channel selector 13 selects an information channel satisfying the above conditions and the following conditions. Condition: When there are a plurality of information channels satisfying the above conditions and the above, a channel having relatively poor communication quality is preferentially selected. That is, the processing S3 shown in FIG.
In, an information channel that satisfies the above conditions and is selected. Other processes are the same as those in FIG.

Specifically, in the example shown in FIG.
If the communication quality of the information channel 73 is lower than that of the information channel 74, the information channel 73 is given priority over the second.
To the information channel 76 on the transmission path 3b. The communication quality of each of the information channels 73 and 74 is measured in each mobile station or base station and stored in the management database 22 of the base station control device 2. Then, the switching channel selection means 13 of the communication control device 1 selects an information channel satisfying the above condition based on the communication quality stored in the management database 22.

As described above, in the seventh embodiment, a channel having relatively poor communication quality is preferentially switched to another transmission path, so that a decrease in communication quality can be suppressed.

Embodiment 8 FIG. In the first embodiment, the switching channel selection unit 13 shown in FIG. 1 selects an information channel that satisfies the above conditions and conditions. In the eighth embodiment, the switching channel selector 13 selects an information channel satisfying the above conditions and the following conditions. Condition: When there are a plurality of information channels satisfying the above conditions and the above, the information channel having the largest available band among them is preferentially selected. That is, in the process S3 shown in FIG. 3, an information channel satisfying the above conditions and is selected. Other processes are the same as those in FIG.

Specifically, in the example shown in FIG.
When the use bandwidth of the information channel 73 is larger than that of the information channel 74, the information channel 73 is preferentially switched to the information channel 76 on the second transmission path 3b.
The bands used by the information channels 73 and 74 are stored in the management database 22 of the base station controller 2 as reserved bands. Then, the switching channel selection means 13 of the communication control device 1 selects an information channel satisfying the above condition based on the reservation information stored in the management database 22.

As described above, in the eighth embodiment, when the bandwidth of the transmission path is reduced, the information channel having a larger use band (reserved band) among the information channels passing through the transmission path is given priority. Since switching to another transmission path is performed, the recovery of the communication quality in the transmission path whose band has been reduced becomes faster.

Embodiment 9 In the first to eighth embodiments, the first and second two base stations 4a and 4b
Has been described. Here, the first to third three or more base stations 4a to 4a to
4c will be described.

FIG. 12 is a configuration diagram illustrating a communication system according to the ninth embodiment. In the figure, the same or corresponding parts as those in FIG. Here, a third base station 4c is connected to the base station controller 2 via a third transmission path 3c. The mobile device 5c can communicate with any of the base stations 4a to 4c.
Here, it is assumed that the mobile device 5c is communicating only with the first base station 4a.

Now, it is assumed that the band of the first transmission line 3a has been reduced. In response to this, the communication control device 1 sets the information channel on the first transmission path 3a assigned to the mobile device 5c to:
The transmission path is switched to the transmission path having the larger vacant band among the transmission paths 3b and 3c. When the communication system between the base station and the mobile station is the WCDMA system, the available bandwidth of each of the transmission paths 3a to 3c is determined by the Retransmission transmitted from each base station to the base station controller 2.
It can be known from the source Status Indication message.

As described above, in the eighth embodiment, since the information channel is preferentially assigned to a transmission path having a large vacant band, the resources of each transmission path can be used efficiently.

[0078]

Since the present invention is configured as described above, it has the following effects. The communication control device according to the present invention detects a decrease in the band of the multiplex transmission path and performs control to switch any one of the plurality of channels passing through the multiplex transmission path to another transmission path. It is possible to suppress a decrease in communication quality in a channel.

Further, since the communication control device according to the present invention reads out information on each channel managed and stored by the base station control device and performs the above-mentioned control, a database for managing the information is uniquely stored. No need to have.

Further, the communication control device according to the present invention performs the above-mentioned control by reading out information on each channel which is managed and stored by the base station control device for outgoing / incoming call connection control, and performs the above-mentioned control. There is no need to have a unique database to do this.

Further, since the communication control device according to the present invention is provided integrally with the base station control device, the size can be reduced.

Further, the communication control apparatus according to the present invention preferentially switches a channel allocated to a mobile station having no channel with another base station to another transmission path. Communication quality can be prevented from deteriorating.

Further, since the communication control device according to the present invention selects a channel to be switched to another transmission path based on the communication time of each channel, a priority is assigned to each channel to suppress a decrease in communication quality. be able to.

Further, the communication control device according to the present invention preferentially switches a channel whose use band is smaller than the vacant band on another transmission line to the other transmission line. Do not degrade the communication quality of the channel.

Further, the communication control apparatus according to the present invention preferentially switches the quality-guaranteed channel to another transmission path over the non-quality-guaranteed channel, so that the communication quality of the quality-guaranteed channel is not reduced. Can be suppressed.

Further, the communication control apparatus according to the present invention preferentially switches a channel having relatively poor communication quality to another transmission path, so that a decrease in communication quality can be suppressed.

Further, since the communication control device according to the present invention selects a channel based on the size of the used band, it is possible to suppress a decrease in communication quality.

Further, the communication control apparatus according to the present invention selects a switching destination base station from among a plurality of base stations based on the size of the available bandwidth of each transmission path, thereby suppressing a decrease in communication quality. it can.

[Brief description of the drawings]

FIG. 1 is a configuration diagram illustrating a communication system according to a first embodiment;

FIG. 2 is an explanatory diagram illustrating a communication state of the communication system illustrated in FIG. 1;

FIG. 3 is a flowchart illustrating an operation of the communication control device according to the first embodiment;

FIG. 4 is a sequence diagram illustrating details of a process S4 illustrated in FIG. 3;

FIG. 5 is a configuration diagram illustrating a main part of a base station control device and a communication control device.

FIG. 6 is a configuration diagram illustrating another communication state of the communication system shown in FIG. 1;

FIG. 7 is an explanatory diagram illustrating a communication state of the communication system illustrated in FIG. 6;

FIG. 8 is a flowchart illustrating an operation of the communication control device according to the third embodiment;

FIG. 9 is a configuration diagram illustrating another communication state of the communication system shown in FIG. 1;

FIG. 10 is an explanatory diagram illustrating a communication state of the communication system illustrated in FIG. 9;

FIG. 11 is a flowchart illustrating an operation of the communication control device according to the fourth embodiment;

FIG. 12 is a configuration diagram illustrating a communication system according to a ninth embodiment;

FIG. 13 is a configuration diagram illustrating a general mobile communication network.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Communication control apparatus 2 Base station control apparatus 3a-3
c Transmission path 4a-4c Base station 5a-5e Mobile device 6a and 6b Communication range 11 Band detection unit 12 Judgment unit 13 Switching channel selection unit 14 Switching control unit 21 Base station control unit 22
Management database 23 Relay unit 71-76 Information channel

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 5K030 HA10 HC09 JL01 JT09 LB08 LB09 MA04 MB01 5K067 AA26 AA33 BB02 DD11 DD41 DD57 EE02 EE10 EE16 EE23 EE41 FF20 HH11 HH22 JJ04 JJ37 JJ76 KK15

Claims (17)

[Claims] 1. A plurality of channels provided between a plurality of mobile stations and another device and passing through a first base station, wherein the plurality of channels pass through the first base station.
A first transmission path multiplexed between the base station and the other device, detecting means for detecting a decrease in the band, and detecting the decrease in the band in the first transmission path. Selecting means for selecting any one of the plurality of channels; and changing the selected channel to a channel provided between a second base station and the other device and passing through a second transmission path. A communication control device, comprising: switching control means for performing switching control. 2. The base station control device, wherein the other device controls the first and second base stations and stores information relating to the plurality of channels required for the control. The communication control device according to claim 1, wherein any one of the channels is selected based on information on the plurality of channels stored by the base station control device. 3. The base station control device controls connection of the plurality of channels when the plurality of mobile stations make and receives calls, and stores information necessary for the control as information on the plurality of channels. The communication control device according to claim 2, wherein: 4. The communication control device according to claim 2, wherein the communication control device is provided integrally with the base station control device. 5. The method according to claim 1, wherein the selecting unit selects, from the plurality of channels, a channel assigned to a mobile station having no channel passing through a base station other than the first base station.
The communication control device according to claim 1, wherein the communication control device is preferentially selected. 6. The communication control device according to claim 1, wherein the selection unit selects a channel based on communication times of the plurality of channels. 7. The method according to claim 1, wherein the selecting unit preferentially selects, from the plurality of channels, a channel whose use band in the first transmission line is smaller than a free band of the second transmission line. The communication control device according to claim 1. 8. The communication control device according to claim 1, wherein said selecting means selects a channel of a quality assurance type preferentially over a channel of a non-guaranteed type. 9. The communication control according to claim 1, wherein said selecting means preferentially selects a channel having relatively poor communication quality from among the plurality of channels. apparatus. 10. The apparatus according to claim 1, wherein the selection unit selects a channel based on communication quality of the plurality of channels measured in each of the plurality of mobile devices. Communication control device as described. 11. The apparatus according to claim 1, wherein said selecting means selects a channel based on communication quality of said plurality of channels measured at said first base station. Communication control device. 12. The communication control device according to claim 1, wherein said selection means selects a channel based on a size of a band used in a first transmission path. 13. A plurality of base stations different from the first base station, based on a size of a vacant band of a transmission path provided between each base station and the other device. 13. The communication control device according to claim 1, wherein a base station is selected, and the selected base station is used as the second base station. 14. When each base station performs CDMA communication with a mobile station, an available band of a transmission path provided between each base station and the other device is determined by using each base station. 14. The communication control device according to claim 13, wherein the communication control device is recognized by a Resource Status Indication message transmitted from the device. 15. A channel provided between the mobile device and another device and passing through a first base station, a radio channel provided between the mobile device and the first base station, 15. The communication device according to claim 1, wherein the mobile station is configured by a wired channel provided between the first base station and the other device, and transmits communication data between the mobile device and the other device. The communication control device according to any one of the above. 16. Communication data between a first base station and a plurality of mobile stations communicating with the first base station is multiplexed between the first base station and another device and transmitted. Detecting means for detecting a decrease in a band with respect to a first transmission path; and a plurality of mobile stations communicating with the first base station when the detection means detects a decrease in a band in the first transmission path. Selecting means for selecting any one of the mobile stations from among the mobile stations, and for switching a communication destination of the selected mobile station to a second base station capable of communicating with the other apparatus via a second transmission path. A communication control device comprising: switching control means for performing control. 17. A plurality of channels provided between a plurality of mobile stations and another device and passing through a first base station, wherein the plurality of channels pass through the first base station.
A first transmission path multiplexed between the base station and the other device, detecting a decrease in the band, and when the detecting unit detects the decrease in the band in the first transmission path, Selecting any one of the above channels, and performing control to switch the selected channel to a channel provided between a second base station and the other device and passing through a second transmission path. Characteristic communication control method.