JP3614823B2 - Radio channel assignment system, control station, mobile station, radio channel assignment method in mobile station, and radio channel assignment control program - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a radio channel assignment system, a control station, a mobile station, a radio channel assignment method in a mobile station, and a radio channel assignment control program, and in particular, a mobile station, a packet subscriber system processing device, a base station, and a mobile station TECHNICAL FIELD The present invention relates to a radio channel allocation system, a control station, a mobile station, a radio channel allocation method in a mobile station, and a radio channel allocation control program in a mobile communication network including a radio channel connecting a radio station and a base station.
[0002]
[Prior art]
In the conventional system, broadcast information including information on a plurality of radio channels is transmitted to a mobile station located in an area covered by a base station. The mobile station selects a radio channel for packet communication from the radio channels of the received broadcast information based on the mobile device identification number assigned to each terminal. Employing this selection method has the effect that the mobile stations can be evenly distributed to each channel when the mobile terminal identification numbers are uniform.
[0003]
[Problems to be solved by the invention]
However, in the above-described method, when the terminal identification numbers of mobile stations located in an area covered by one base station are not uniform and there is a bias, the mobile devices connected to each channel are biased. In addition, the ratio of occupying the wireless channel varies depending on the type of service used by the mobile station, for example, e-mail, WEB browsing, FTP (File Transfer Protocol) service, and the like.
[0004]
An object of the present invention is to provide a radio channel allocation system, a control station, a mobile station, a radio channel allocation method in a mobile station, and a radio channel allocation system capable of appropriately distributing traffic of each radio channel in a radio base station having a plurality of channels, and A radio channel assignment control program is provided.
[0005]
[Means for Solving the Problems]
A radio channel assignment system according to claim 1 of the present invention is a radio channel assignment system in a network including a mobile station that performs radio communication by selecting a plurality of radio channels and a control station that performs radio communication control with the mobile station. The control station includes a notification unit that notifies the mobile station of traffic information for each of the plurality of radio channels,
The mobile station selects a radio channel with the smallest number of communicating mobile stations from among available radio channels, and a mode to select a radio channel with the smallest radio channel usage rate among available radio channels. And channel selection means for selecting one of the plurality of wireless channels based on the received traffic information, and performing wireless communication using the selected channel.
[0006]
A radio channel assignment system according to claim 2 of the present invention is characterized in that, in claim 1, the notifying means notifies the mobile station of the traffic information via a relay station.
[0007]
The radio channel assignment system according to claim 3 of the present invention is the radio channel assignment system according to claim 1 or 2, wherein the notifying unit notifies the traffic information during radio communication between the mobile station and the control station, and the channel selecting unit includes: , One of the plurality of radio channels is selected based on the traffic information received during radio communication with the control station.
[0008]
A mobile station according to claim 4 of the present invention is a mobile station that performs radio communication by selecting a plurality of radio channels in a network including a control station that performs radio communication control, and is in communication among the available radio channels. Based on the traffic information received from the control station, the mode is switched between the mode for selecting the radio channel with the smallest number of mobile stations and the mode for selecting the radio channel with the lowest radio channel usage rate among the available radio channels. Channel selection means for selecting one of the plurality of wireless channels is included, and wireless communication is performed using the selected channel.
[0009]
The mobile station according to claim 5 of the present invention is the mobile station according to claim 4, wherein the channel selection means selects any of the plurality of radio channels based on the traffic information received during radio communication with the control station. It is characterized by that.
[0010]
A radio channel allocation method according to claim 6 of the present invention is a radio channel allocation method in a mobile station that performs radio communication by selecting a plurality of radio channels in a network including a control station that performs radio communication control. A traffic information receiving step for receiving traffic information from a mobile station, a mode for selecting a radio channel with the smallest number of mobile stations in communication among available radio channels, and a radio channel usage rate being the lowest among available radio channels. A mode for selecting a radio channel, and a channel selection step for selecting one of the plurality of radio channels based on the traffic information received in the traffic information reception step. Radio communication using the selected channel It is characterized by performing.
[0011]
According to claim 7 of the present invention, in the radio channel assignment method according to claim 6, in the channel selection step, one of the plurality of radio channels is selected based on the traffic information received during radio communication with the control station. It is characterized by selecting.
[0012]
A radio channel allocation control program according to claim 8 of the present invention is a radio channel allocation control program in a mobile station that performs radio communication by selecting a plurality of radio channels in a network including a control station that performs radio communication control, A traffic information receiving step for receiving traffic information from a control station, a mode for selecting a radio channel with the smallest number of mobile stations in communication among available radio channels, and a radio channel usage rate among available radio channels. A mode for selecting a minimum radio channel, and a channel selection step for selecting one of the plurality of radio channels based on the traffic information received in the traffic information reception step, and using the selected channel It is characterized by performing wireless communication.
[0013]
According to claim 9 of the present invention, in the radio channel assignment control program according to claim 8, in the channel selection step, any one of the plurality of radio channels is determined based on the traffic information received during radio communication with the control station. It is characterized by selecting.
[0020]
In accordance come techniques, transmitted from the base station, received by the mobile station a broadcast information including radio channel information for a plurality of packet communications. Then, the mobile station selects a radio channel for packet communication from among a plurality of radio channels included in the received broadcast information, based on the mobile station identification number assigned to each station (self terminal).
[0021]
On the other hand, in the present invention, the mobile station selects one of a plurality of radio channels based on the received traffic information, and performs radio communication using the selected channel, so that the control station manages a plurality of radio channels. The traffic can be evenly distributed without causing variations in the number of mobile stations that communicate with each other on the wireless channel. In particular, by selecting a radio channel based on the number of communicating mobile stations, traffic can be evenly distributed without causing variations in the number of mobile stations. Further, by selecting a radio channel based on the radio channel usage rate, traffic for each radio channel can be evenly distributed, and assignment for using the radio channel can be performed efficiently.
[0022]
In addition, the mode for selecting the radio channel with the smallest number of mobile stations in communication among the available radio channels and the mode for selecting the radio channel with the lowest radio channel usage rate among the available radio channels are switched. Thus, it is possible to effectively assign channels by changing the radio channel selection method according to the service provided to the mobile station. For example, if the service types used by all mobile stations are the same, there is no difference in the ratio occupied by the radio channel, so the channel is selected based on the number of mobile stations. If the service types are not the same, the radio channel is occupied. The selection method of the radio channel may be changed according to the service provided to the mobile station, such as selecting a channel based on the usage rate of the radio channel because the ratios to be used are different.
[0023]
DETAILED DESCRIPTION OF THE INVENTION
Next, embodiments of the present invention will be described with reference to the drawings. In each drawing referred to in the following description, the same reference numerals are given to the same parts as in the other drawings.
FIG. 1 is a block diagram showing an embodiment of a radio channel assignment system according to the present invention. As shown in the figure, in the present embodiment, a case will be described in which the present invention is applied to a PDC (Personal Digital Cellular) mobile packet communication system. In the figure, this system includes a mobile station 1, a base station 2 that functions as a control station that performs radio communication control with the mobile station 1, a packet subscriber processing unit 3, and a radio line 4. It is configured. A wireless line 4 is prepared between the base station 2 and the mobile station 1 and is composed of a plurality of wireless channels. Between the base station 2 and the mobile station 1, transmission / reception of notification information and transmission / reception of packet communication data necessary for establishing communication are performed using a radio channel. Note that a radio channel for transmitting and receiving broadcast information and a radio channel for transmitting and receiving packet communication data may be prepared in different base stations.
[0024]
In the prior art described above, the mobile station selects a channel for packet communication from the radio channels of the received broadcast information based on the mobile station identification number assigned to each terminal.
On the other hand, in the present invention, a channel for packet communication is selected using a radio channel management table held in the packet subscriber processor.
[0025]
That is, in this system, as shown in FIG. 2, the radio channel management table 5 is held inside the packet subscriber processing device 3. As shown in the figure, this radio channel management table 5 includes items of a radio channel number 5A, the number of mobile stations 5B in communication on the corresponding radio channel, and a radio channel usage rate 5C. In addition, it is assumed that information (not shown) related to other wireless channel traffic is also managed.
[0026]
As shown in the figure, it is assumed that the wireless channel number 5A has four channels # 1 to # 4.
Further, the number of mobile stations 5B in communication on the corresponding wireless channel indicates the number of mobile stations performing packet communication using a certain wireless channel. In this example, the mobile station is “100” for the channel with the radio channel number 5A “# 1”, the mobile station is “100” for the “# 2” channel, and the “# 3” channel. Is “30 units” for the mobile station, and “50 units” for the “# 4” channel.
[0027]
Furthermore, the wireless channel usage rate 5C is a value obtained by calculating a rate at which a wireless channel is used by a mobile station during a certain period. In this example, the usage rate is “100%” for the channel with the wireless channel number 5A “# 1”, the usage rate is “30%” for the channel “# 2”, and the channel “# 3”. The usage rate is “100%”, and the usage rate is “50%” for the channel “# 4”.
[0028]
Here, even when the number of mobile stations in communication is equal in two two wireless channels, the usage rate of the wireless channel may differ depending on the frequency of actually transmitting and receiving data. When there is a change in traffic information such as the wireless channel number, the number of mobile stations in communication on the corresponding wireless channel, and the wireless channel usage rate, the packet subscriber processor 3 wirelessly transmits to the mobile station 1 via the base station 2. The channel management table 5 is transmitted to notify the traffic information.
[0029]
In this case, for example, as shown in FIG. 3, traffic information is notified as broadcast information. In this case, broadcast information S10 including radio channel information and traffic information is transmitted from the packet subscriber system processing device 3 to the mobile station 1 via the base station 2. The mobile station 1 selects a radio channel (S11) with reference to traffic information included in the received broadcast information. Thereby, packet communication using the selected wireless channel is started (S12), and the state shifts to a state during packet communication (S13).
[0030]
Further, as shown in FIG. 4, only the traffic information may be notified by a signal different from the broadcast information. In this case, the traffic information S10A is sent from the packet subscriber processing unit 3 to the mobile station 1 via the base station 2. The mobile station 1 refers to the received traffic information and selects a radio channel (S11). Thereafter, as in the case of FIG. 3, packet communication using the selected radio channel is started (S12), and the state shifts to a state during packet communication (S13).
[0031]
Furthermore, as shown in FIG. 5, traffic information may be notified via a relay device 6 such as a base station control device connected to the base station 2. In this case, as shown in FIG. 6, the packet subscriber system processing device 3 notifies the relay device 6 of the traffic information S10A. Then, the relay device 6 transmits broadcast information S10B including radio channel information and traffic information to the mobile station 1 via the base station 2. The mobile station 1 selects a radio channel (S11) with reference to traffic information included in the received broadcast information. Thereafter, as in the case of FIG. 3 and FIG. 4, this starts packet communication using the selected radio channel (S12), and shifts to a state during packet communication (S13).
[0032]
Here, the selection of the radio channel (S11) in the case of FIGS. 3, 4 and 6 will be described. The mobile station 1 selects a radio channel to be used for packet communication from a plurality of radio channels according to a predetermined channel selection logic based on a radio channel management table (see FIG. 2) of the received traffic information. Start packet communication. Examples of the channel selection logic include the following.
(1) Method for a mobile station to select a radio channel with the smallest number of mobile stations in communication among available radio channels in a radio channel management table of broadcast information for selecting a radio channel with the smallest number of mobile stations in communication It is. In the case illustrated in FIG. 2, the channel with the radio channel number “# 3” having the minimum number of mobile stations 5B in communication on the corresponding radio channel is “30” is selected. By selecting a radio channel based on the number of mobile stations in communication, traffic can be evenly distributed without causing variations in the number of mobile stations.
(2) Method of selecting a mobile station with a radio channel with the lowest radio channel usage rate from among available radio channels in the radio channel management table of broadcast information for selecting a radio channel with the lowest radio channel usage rate It is. In the case illustrated in FIG. 2, the channel with the radio channel number “# 2” having the minimum radio channel usage rate 5C of “30%” is selected. By selecting a radio channel based on the radio channel usage rate, traffic for each radio channel can be evenly distributed, and allocation for using the radio channel can be performed efficiently.
[0033]
The operation may be performed by switching between the mode (1) and the mode (2). That is, the mode is switched between a mode for selecting a radio channel with the smallest number of mobile stations in communication among available radio channels and a mode for selecting a radio channel with the lowest radio channel usage rate among available radio channels. . By doing so, it is possible to effectively assign channels by changing the method of selecting a radio channel according to the service provided to the mobile station. For example, if the service types used by all mobile stations are the same, there is no difference in the ratio occupied by the radio channel, so the channel is selected based on the number of mobile stations. If the service types are not the same, the radio channel is occupied. The selection method of the radio channel may be changed according to the service provided to the mobile station, such as selecting a channel based on the usage rate of the radio channel because the ratios to be used are different.
[0034]
Incidentally, as shown in FIG. 7, the packet subscriber processing device 3 may notify the mobile station 1 that is performing packet communication of traffic information in addition to the radio channel information. In this case, traffic information may be newly added to the packet channel switching request. Then, in the state during packet communication (S13A), a packet channel switching request S10B is transmitted from the packet subscriber processor 3 to the mobile station 1. The packet channel switching request is defined in ARIB RCR STD-27 I-1 version, which is a well-known standard, and includes radio channel information such as frequency.
[0035]
The mobile station 1 refers to the traffic information included in the received packet channel switching request and selects a radio channel (S11). Thereby, channel switching (S12A) is performed so that the selected radio channel is used. After that, the packet communication state is continued (S13B). As described above, it is possible to notify the mobile station 1 of traffic information by mounting the radio channel management table in the packet channel switching request from the packet subscriber processing device 3.
[0036]
In the mobile station of the radio channel assignment system described above, a radio channel assignment method as shown in FIG. 8 is realized. That is, referring to the figure, the mobile station first receives traffic information from the control station (step S101). This traffic information may be received during wireless communication with the control station.
Next, the mobile station selects one of a plurality of radio channels based on the received traffic information (step S102). When selecting the radio channel, the radio channel with the smallest number of mobile stations in communication may be selected from the available radio channels, or the radio channel with the lowest radio channel usage rate among the available radio channels. May be selected. Furthermore, it switches between the mode that selects the radio channel with the smallest number of mobile stations in communication among the available radio channels and the mode that selects the radio channel with the lowest radio channel usage rate among the available radio channels. May be.
[0037]
Then, the mobile station performs wireless communication using the selected channel (step S103).
According to the radio channel assignment method as described above, the number of mobile stations that communicate using a plurality of radio channels managed by the base station can be evenly distributed without causing variations. Then, by selecting a radio channel based on the number of mobile stations in communication, traffic can be evenly distributed without causing variations in the number of mobile stations. Further, by selecting a radio channel based on the radio channel usage rate, traffic for each radio channel can be evenly distributed, and assignment for using the radio channel can be performed efficiently.
[0038]
If a program for realizing the operation shown in FIG. 8 is prepared and the mobile station is controlled by this program, it is obvious that the radio channel assignment process can be performed as described above. As a recording medium for recording the program, various recording media can be used in addition to a semiconductor memory, a magnetic disk, an optical disk, and the like not shown in FIG. According to this radio channel assignment control program, the number of mobile stations that communicate with each other through a plurality of radio channels managed by the base station can be evenly distributed without causing variations. Then, by selecting a radio channel based on the number of mobile stations in communication, traffic can be evenly distributed without causing variations in the number of mobile stations. Further, by selecting a radio channel based on the radio channel usage rate, traffic for each radio channel can be evenly distributed, and assignment for using the radio channel can be performed efficiently.
[0039]
The above describes the case where the present invention is applied to the case of the PDC system, but it is obvious that the present invention can also be applied to mobile communication systems of other systems. It is also clear that the present invention can be applied to radio channels other than for packet communication where one channel is shared by a plurality of mobile stations.
[0040]
【The invention's effect】
As described above, according to the present invention, the mobile station selects one of a plurality of wireless channels based on the traffic information received from the control station, and performs wireless communication using the selected channel. There is an effect that traffic can be evenly distributed without causing variations in the number of mobile stations that perform communication using a plurality of managed radio channels. In particular, by selecting a radio channel based on the number of mobile stations in communication, there is an effect that traffic can be evenly distributed without causing variations in the number of mobile stations. Further, by selecting a radio channel based on the radio channel usage rate, traffic for each radio channel can be evenly distributed, and there is an effect that allocation for using the radio channel can be performed efficiently. Further, the mode is switched between a mode for selecting a radio channel with the smallest number of mobile stations in communication among available radio channels and a mode for selecting a radio channel with the lowest radio channel usage rate among available radio channels. Thus, there is an effect that a channel can be effectively allocated by changing a radio channel selection method according to a service provided to the mobile station.
[Brief description of the drawings]
FIG. 1 is a block diagram showing an embodiment of a radio channel assignment system according to the present invention.
FIG. 2 is a diagram showing a radio channel management table and the like of the radio channel assignment system according to the present invention.
FIG. 3 is a sequence diagram showing an operation example of each part of the radio channel assignment system according to the embodiment of the present invention.
FIG. 4 is a sequence diagram showing another operation example of each part of the wireless channel assignment system according to the embodiment of the present invention.
FIG. 5 is a block diagram showing another configuration example of a radio channel assignment system according to the present invention.
6 is a sequence diagram showing an operation example of each part of the wireless channel assignment system of FIG. 5. FIG.
7 is a sequence diagram showing an operation example using a packet channel switching request in the wireless channel assignment system of FIG. 5. FIG.
FIG. 8 is a flowchart showing a radio channel assignment method implemented in a mobile station and a program for controlling the mobile station.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Mobile station 2 Base station 3 Packet subscriber system processing device 4 Wireless line 5 Wireless channel management table 5A Wireless channel number 5B Number of mobile stations in communication 5C Wireless channel usage rate 6 Relay device

Claims (9)

A radio channel assignment system in a network including a mobile station that performs radio communication by selecting a plurality of radio channels and a control station that performs radio communication control with the mobile station, wherein the control station includes the radio stations Notification means for notifying the mobile station of traffic information for each channel;
The mobile station selects a radio channel with the smallest number of communicating mobile stations from among available radio channels, and a mode to select a radio channel with the lowest radio channel usage rate among available radio channels. And a channel selection means for selecting one of the plurality of radio channels based on the received traffic information, and performing radio communication using the selected channel. The radio channel assignment system according to claim 1, wherein the notification unit notifies the mobile station of the traffic information via a relay station. The notifying means notifies the traffic information during wireless communication between the mobile station and the control station, and the channel selecting means is configured to select the plurality of information based on the traffic information received during wireless communication with the control station. The radio channel assignment system according to claim 1 or 2 , wherein any one of the radio channels is selected . A mobile station that performs wireless communication by selecting a plurality of wireless channels in a network including a control station that performs wireless communication control, and selects a wireless channel having the smallest number of communicating mobile stations from among usable wireless channels. Switch between a mode and a mode for selecting a radio channel with the lowest radio channel usage rate from among available radio channels, and select one of the plurality of radio channels based on traffic information received from the control station A mobile station comprising channel selection means and performing wireless communication using the selected channel. The mobile station according to claim 4, wherein the channel selection unit selects one of the plurality of radio channels based on the traffic information received during radio communication with the control station. A radio channel assignment method in a mobile station that performs radio communication by selecting a plurality of radio channels in a network including a control station that performs radio communication control, and a traffic information reception step that receives traffic information from the control station and can be used Switching between a mode for selecting a radio channel with the smallest number of mobile stations in communication among active radio channels and a mode for selecting a radio channel with the lowest radio channel usage rate among available radio channels, and the traffic information And a channel selection step of selecting one of the plurality of radio channels based on the traffic information received in the reception step, and performing radio communication using the selected channel. 7. The radio channel assignment method according to claim 6, wherein, in the channel selection step, one of the plurality of radio channels is selected based on the traffic information received during radio communication with the control station. . A radio channel assignment control program in a mobile station that performs radio communication by selecting a plurality of radio channels in a network including a control station that performs radio communication control, a traffic information receiving step for receiving traffic information from the control station, and use Switching between a mode for selecting a radio channel with the smallest number of mobile stations in communication among possible radio channels and a mode for selecting a radio channel with the lowest radio channel usage rate among available radio channels, A channel selection step for selecting one of the plurality of radio channels based on the traffic information received in the information reception step, and performing radio communication using the selected channel. . 9. The radio channel assignment control according to claim 8, wherein, in the channel selection step, one of the plurality of radio channels is selected based on the traffic information received during radio communication with the control station. program.

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