JP7111428B2 - Radio communication control device, radio communication system, channel allocation method and program - Google Patents

Description

The present invention relates to a radio communication control device, radio communication system, channel allocation method and program, and more particularly to a radio communication control device, radio communication system, channel allocation method and program for controlling radio communication.

MCA (Multi-Channel Access) radio, which is a multi-channel access system using radio waves in the 800 MHz band, is used as a mobile communication system for business use. The MCA radio aims for effective use and convenience of radio waves by allowing a large number of users to share a plurality of communication channels.

As related technologies, for example, the technologies described in Patent Documents 1 and 2 are known. Patent Literature 1 describes a technique for setting a communication channel and making a call in a multi-channel access system. Patent Literature 2 describes a technique in which a center device controls the polling operation of a slave station by a relay station.

JP-A-63-200629 JP-A-04-292096

In MCA radio, a communication system is adopted in which a plurality of predetermined frequencies are used jointly by a plurality of users for communication, and a radio relay device automatically selects and allocates an empty channel from a plurality of communication channels (frequencies). This allows a large number of users to share a certain number of communication channels and make calls smoothly.

However, the related technique has a problem that it may be difficult to distribute the load of the plurality of wireless relay devices when allocating the communication channels of the plurality of wireless relay devices to the wireless terminals.

In view of such problems, an object of the present disclosure is to provide a radio communication control device, a radio communication system, a channel allocation method, and a program capable of distributing loads on a plurality of radio relay devices.

A radio communication control apparatus according to the present disclosure includes a priority order setting unit that sets priorities of a plurality of radio relay apparatuses that perform radio communication using a multi-channel access method, and any radio relay apparatus among the plurality of radio relay apparatuses. a channel allocation unit that allocates a communication channel of the radio relay device to a radio terminal that uses the control channel of (1) based on the set priority of the radio relay device.

A radio communication system according to the present disclosure is a radio communication system including a radio terminal, a plurality of radio relay devices, and a radio communication control device, wherein the radio communication control device performs radio communication using a multi-channel access method. a priority order setting unit for setting priority orders of a plurality of wireless relay apparatuses; and a channel allocation unit that allocates the communication channel of the radio relay device based on the priority order of the above.

A channel allocation method according to the present disclosure sets priorities for a plurality of wireless relay devices that perform wireless communication in a multi-channel access scheme, and uses a control channel of one of the wireless relay devices among the plurality of wireless relay devices. A communication channel of the wireless relay device is assigned to the wireless terminal based on the set priority of the wireless relay device.

A channel allocation program according to the present disclosure sets priorities of a plurality of wireless relay devices that perform wireless communication using a multi-channel access method, and uses a control channel of one of the plurality of wireless relay devices. A channel allocation program for causing a computer to execute processing for allocating a communication channel of the wireless relay device to a wireless terminal based on the set priority of the wireless relay device.

Advantageous Effects of Invention According to the present disclosure, it is possible to provide a radio communication control device, a radio communication system, a channel allocation method, and a program capable of distributing loads on a plurality of radio relay devices.

FIG. 4 is a diagram showing an example of communication channel allocation according to related technology; 1 is a configuration diagram showing an overview of a communication control device according to an embodiment; FIG. 1 is a configuration diagram showing the configuration of a radio communication system according to Embodiment 1; FIG. 4 is a sequence diagram showing the operation of the radio communication system according to Embodiment 1; FIG. 1 is a configuration diagram showing the configuration of a communication control apparatus according to Embodiment 1; FIG. 4 is a diagram showing an example of priority order setting information according to Embodiment 1. FIG. 4 is a flow chart showing communication channel allocation operation according to Embodiment 1; 4 is a diagram showing an example of communication channel allocation according to Embodiment 1; FIG. 4 is a diagram showing an example of communication channel allocation according to Embodiment 1; FIG. FIG. 10 is a configuration diagram showing the configuration of a communication control apparatus according to Embodiment 2; 10 is a flow chart showing communication channel allocation operation according to Embodiment 2. FIG.

Embodiments will be described below with reference to the drawings. In each drawing, the same elements are denoted by the same reference numerals, and redundant description will be omitted as necessary.

(Examination leading to the embodiment)
First, the study leading to the embodiment will be described using related technology. FIG. 1 shows a wireless communication system according to related technology and an example of its channel allocation operation. As shown in FIG. 1, the radio communication system 2 includes a communication control device 90, a relay station RS#1, a plurality of radio relay devices BTS#1 to #3 (one of which is also called a radio relay device BTS), and a plurality of users. It has radio stations ML#1 to #7 (one of them is also called a user radio station ML).

The wireless communication system 2 is a system that provides MCA wireless services to users. By making a contract with a telecommunications carrier that provides MCA wireless services and registering the user wireless station ML to be used and the service area SA to be used, the user can communicate (talk) using the MCA wireless. When a user makes a contract, a user code is given to each user radio station ML, and based on this user code, the user radio station ML communicates with other user radio stations ML. In order to enable communication between the user radio stations ML, in this example, the relay station RS#1 serving the service area SA#1 is a radio relay station that relays communications of the user radio stations ML#1 to ML#7. The devices BTS#1 to #3 are accommodated, and a communication control device 90 controls communications of the radio repeaters BTS#1 to #3 and the user radio stations ML#1 to #7.

In the related technology, when the user radio station ML performs communication, the communication control device 90 assigns an empty channel of the radio relay device BTS corresponding to the user code of the user radio station ML to the user radio station ML. As shown in FIG. 1, each radio repeater BTS has 16 channels of 4 carriers (frequency) and 4 slots (time slots) for each carrier. The frequencies of carriers 1 to 4 are different for each radio repeater BTS. One of these 16 channels is set as a common access channel CAC, and the other 15 channels are set as user individual channels USC. The common access channel CAC is a control channel for communication control such as call connection control (the common access channel is also called a control channel), and the user individual channel USC is a communication channel for communication such as telephone call (user individual channel are also called communication channels).

In order to communicate, the user radio station ML makes a communication request (call) to the common access channel CAC of one of the radio repeaters BTS. At this time, the user radio station ML selects the common access channel CAC of the radio relay device BTS to access based on the user code of the user radio station ML according to the MCA radio communication standard. Specifically, the remainder obtained by dividing the user code by the number of radio repeaters in the relay station ("3" in this example) is obtained, the common access channel CAC of the radio repeater corresponding to this remainder is selected, and the common access channel CAC is selected. Request communication over channel CAC. Then, in the related technology, the communication control device 90 allocates an empty channel of the radio relay device BTS containing the selected and requested common access channel CAC to the user radio station ML.

In the example of FIG. 1, user radio stations ML#1, ML#3, ML#5, ML#6, and ML#7 select common access channel CAC#1 of radio relay device BTS#1 based on user codes. Then, user radio station ML#4 selects common access channel CAC#2 of radio relay device BTS#2 based on the user code, and user radio station ML#2 selects common access channel CAC#2 of radio relay device BTS# based on the user code. 3 common access channel CAC#3.

If the user radio stations ML#1 to ML#7 are requested to communicate in order, the user radio station ML#1 first accesses the common access channel CAC#1 of the radio relay apparatus BTS#1. Then, since the channels of carriers 1 to 4 of the radio relay device BTS#1 are vacant, the user dedicated channel USC (empty slot) of carrier 1 of the radio relay device BTS#1 is allocated (S1). Next, the user radio station ML#2 accesses the common access channel CAC#3 of the radio relay device BTS#3, and since the channels of carriers 1 to 4 of the radio relay device BTS#3 are open, A user dedicated channel USC of carrier 1 of BTS#3 is assigned (S2).

Similarly, the user radio station ML#3 is assigned the user individual channel USC of carrier 2 of the radio relay device BTS#1 (S3), and the user radio station ML#4 is assigned the carrier of the radio relay device BTS#2. One user dedicated channel USC is assigned (S4). Further, user radio station ML#5 is assigned the user individual channel USC of carrier 3 of radio relay device BTS#1 (S5), and user radio station ML#6 is assigned carrier 4 of radio relay device BTS#1. of user dedicated channels USC are assigned (S6).

At this time, all channels of the radio relay device BTS#1 are allocated and in use, and when the user radio station ML#7 accesses the common access channel CAC#1 of the radio relay device BTS#1, the radio relay device BTS#1 Since there is no free channel in #1, the connection of user radio station ML#7 is refused (S7). Since the call time is limited to 3 to 5 minutes, the call is normally ready after 3 to 5 minutes.

As described above, the wireless communication system of MCA radio is used for business purposes. For example, public organizations construct and operate their own network communication infrastructure by MCA radio. As shown in FIG. 1, in the private network communication infrastructure, there is a relay station in which a plurality of wireless relay devices are arranged in one station building. A related technique allocates a user dedicated channel USC of a radio relay apparatus having a common access channel CAC corresponding to a contracted user code. That is, in the related technology, since the common access channel is selected based on the user code, on the premise that users are assigned to each common access channel (radio relay device) to some extent, It adopts a method of allocating a channel in the radio repeater specified by the

However, in this allocation method, even if a plurality of radio relay devices are arranged in the same relay station, only one radio relay device can be used by the user code of the own station, and communication is possible with other radio relay devices. It is not possible. In an area with a large number of contracted users (user codes), users may concentrate on one wireless relay device, and all the user-dedicated channels of the wireless relay device may be in use. Therefore, even though there is a vacant user-dedicated channel in a relay station device other than the radio relay device, the radio relay device cannot allocate a user-dedicated channel because there is no vacant user-dedicated channel, and cannot communicate. A problem arises. That is, the related technology cannot distribute the load and risk of the wireless relay device.

As a method of solving this problem, there is a method of distributing users by increasing the number of wireless relay devices, but considering the installation location and cost of wireless relay devices, it is difficult to easily increase the number of wireless relay devices. . Therefore, in the following embodiments, it is possible to solve the above-described problems such as the local communication load without increasing the number of wireless relay devices.

(Overview of Embodiment)
FIG. 2 shows an overview of the communication control device according to the embodiment. A communication control device (radio communication control device) 100 includes a priority setting section 110 and a channel allocation section 120 .

Priority order setting section 110 sets the priority order of a plurality of wireless relay apparatuses that perform wireless communication in a multi-channel access (MCA) scheme. The channel allocation unit 120 assigns a wireless terminal using the control channel of one of the plurality of wireless relay devices to a wireless terminal based on the priority of the wireless relay device set by the priority setting unit 110. Allocate a communication channel for the repeater.

In the embodiment, the communication control device in the MCA radio system allocates user-dedicated channels (communication channels) based on the set priority of the radio relay devices, thereby using the communication channels of a plurality of radio relay devices as shared resources. , channel distribution control can be performed for wireless relay devices that do not have a common access channel (control channel). That is, in a system composed of a plurality of radio repeaters, a user radio station (radio terminal) contracting for a radio service area uses a user-specific channel of a radio repeater other than the contracted radio repeater within the system. be able to. In a related technique, a user dedicated channel of a radio relay apparatus having a common access channel identified based on a user code is assigned, but by sharing the user dedicated channel, a wireless device without a common access channel is assigned. Since the communication resources of the relay device can be used, the communication resources of the entire system can be increased.

(Embodiment 1)
Embodiment 1 will be described below with reference to the drawings. FIG. 3 shows a configuration example of a radio communication system according to this embodiment. As shown in FIG. 3, the radio communication system 1 according to the present embodiment includes an operation monitoring control device 20, a communication control device 10, a plurality of relay stations RS #1 and #2 (one of which is also referred to as a relay station RS). , a plurality of radio repeaters BTS#1 to #5, and a plurality of user radio stations ML#1 to #7. For example, the MCA radio system can be used as a business mobile communication system such as business radio for taxis and buses, disaster prevention radio for local governments, and crisis management radio for companies. The radio communication system 1 is an 800 MHz band digital MCA radio system, and each device operates in accordance with the MCA radio communication standard such as ARIB STD-T85.

The operation monitoring control device 20 is connected to the communication control device 10 and monitors the operating state of the wireless communication system 1 via the communication control device 10 . For example, the operation monitoring control device 20 periodically collects and collects information such as the communication status and failure status of the communication control device 10 and the radio relay devices BTS#1 to #5 (relay stations RS#1 and #2). The results are output to a display device or the like. In addition, the operation monitoring control device 20 performs settings required for operation of the communication control device 10 and the radio relay devices BTS (relay stations RS#1 and #2).

The communication control device 10 is a device that performs communication control with the radio relay device BTS and the like and call connection control for each communication. In this example, the communication control device 10 is communicably connected to the radio relay devices BTS#1 to #5 of the relay stations RS#1 and #2, and the user radio stations via the radio relay devices BTS#1 to #5. Controls communication (call) of ML#1 to #7. In response to a communication request from the user radio station ML in call connection control, the communication control apparatus 10 selects a destination radio station to be communicated with, and selects one of a plurality of radio repeaters BTS based on the service contract of the user radio station ML. allocates an appropriate user dedicated channel of the radio repeater BTS from BTS, performs transition control to the user dedicated channel to which the user radio station ML to be communicated is allocated, and realizes communication.

The relay station RS is a station building in which a plurality of radio relay devices BTS are arranged, that is, a station accommodating a plurality of radio relay devices BTS. A relay station RS provides MCA radio services to user radio stations ML in a service area SA by means of a plurality of radio repeaters BTS. In this example, the relay station RS#1 accommodates the radio relays BTS#1 to BTS#3 and provides services in the service area SA#1, and the relay station RS#2 accommodates the radio relays BTS#4 and BTS#4. It accommodates BTS#5 and provides service in service area SA#2.

The radio relay device BTS performs radio communication with the user radio stations ML in the service area SA, and relays communication between the user radio stations ML within the relay station RS and communication between the user radio stations ML in different relay stations RS. The radio relay device BTS performs channel allocation and communication connection according to requests from the user radio station ML and the communication control device 10 . In this example, the radio relay devices BTS#1 to #3 perform radio communication with the user radio stations ML#1 to ML#5 in the service area SA#1, and the radio relay devices BTS#4 and #5 communicate with the user radio stations ML#1 to ML#5. In area SA#2, radio communication is performed with user radio stations ML#6 to ML#8.

The user radio station ML is a radio terminal that performs radio communication with the radio repeater BTS by MCA radio. The user radio station ML is a mobile radio device, and is capable of radio communication while moving within the service area SA or between service areas SA. In the MCA radio system, a user radio station ML uses a radio service within a service area SA subscribed by a user. In this example, user radio stations ML#1 to ML#5 communicate (talk) with other user radio stations ML via radio repeaters BTS#1 to #3, and user radio stations ML#6 to ML #8 communicates with other user radio stations ML via radio repeaters BTS#4 and #5.

FIG. 4 shows a schematic operation at the time of calling connection in the wireless communication system according to the present embodiment. In this example, the user radio station ML#1 in the service area SA#1 under the relay station RS#1 makes a call to the user radio station ML#8 in the service area SA#2 under the relay station RS#2, and is connected. This is an example of It should be noted that FIG. 4 shows an outline for explaining the operation related to the present embodiment, and actually call connection is performed according to detailed procedures according to the ARIB standard. That is, "call request", "call response", "incoming call notification", and "incoming call response" in FIG. message is used.

As shown in FIG. 4, the user radio station ML#1 sends a call request to one of the radio repeaters BTS#1 to BTS#3 in order to communicate with the user radio station ML#8 in accordance with the user's operation. Send (S101). When accessing the radio relay device BTS, the user radio station ML#1 selects the radio relay device BTS to access based on the user code of the user radio station ML#1. As described above, the user radio station ML#1 obtains the remainder obtained by dividing the user code by the number of radio repeaters in the relay station, and sends a call via the common access channel CAC of the radio repeaters corresponding to this remainder. demand.

Subsequently, the communication control device 10 allocates a calling side channel (S102). When the communication control device 10 receives a call request from the user radio station ML#1 via any one of the radio relay devices BTS#1 to #3, the communication control device 10 receives the call request from the radio relay device BTS in the relay station RS#1 on the calling side. One of the free channels #1 to #3 is assigned to the user radio station ML#1. The communication control device 10 sets communication channel allocation to the corresponding radio relay device BTS. A specific allocation method will be described later.

The timing of channel assignment on the calling side may be when a call request is received from the user radio station ML#1 on the calling side, or when a call response is received from the user radio station ML#8 on the called side. It can be when Also, when a call request is received from the user radio station ML#1 on the calling side, a communication channel for the calling side is temporarily (tentatively) allocated, and the call is received from the user radio station ML#8 on the called side. The allocation of the communication channel may be determined when the call response is accepted.

Subsequently, the communication control device 10 searches for the relay station on the called side (S103). The communication control apparatus 10 searches for the relay station RS in which the user radio station ML#8, which is the destination of the call request, is registered in order to process the incoming call to the user radio station ML#8 on the called side.

Subsequently, the communication control unit 10 allocates a called channel (S104). When the relay station RS#2 on the called side is specified, the communication control apparatus 10 sends an empty channel of one of the radio relay apparatuses BTS#4 and #5 of the relay station RS#2 to the user radio station ML#8. assign. The communication control device 10 sets communication channel allocation to the corresponding radio relay device BTS. This assignment method is the same as for the calling party in S102. The timing of channel assignment on the called side may be when the relay station on the called side is searched, or when a call response is received from the user radio station ML#8 on the called side. Also, when searching for a relay station on the called side, a communication channel for the called side is temporarily (provisionally) assigned, and when a call response is received from the user radio station ML#8 on the called side, Communication channel assignments may be established.

Subsequently, the communication control device 10 transmits an incoming call notification to the user radio station ML#8 (S105). The communication control device 10 notifies the user radio station ML#8 of the incoming call via the common access channel CAC of one of the radio relay devices BTS#4 and #5 in the relay station RS#2 on the called side. The common access channel CAC is selected based on the user code of user radio station ML#8, as in the case of outgoing calls.

Subsequently, the communication control device 10 receives an incoming call response from the user radio station ML#8 (S106). When the user radio station ML#8 receives the incoming call notification, it is called, and responds to the user radio station ML#1 according to the user's operation. Send an incoming call response over the access channel CAC.

Subsequently, the communication control device 10 transmits a call response to the user radio station ML#1 (S107). When the communication control device 10 accepts the incoming call response of the user radio station ML#8 via one of the radio relay devices BTS#4 and #5, the communication control device 10 receives the radio relay device BTS of the calling-side relay station RS#1. A call response is transmitted to the user radio station ML#1 via one of #1 to #3. As a result, a call is set up (connected) between the user radio station ML#1 and the user radio station ML#8, and a call is made through the channel assigned to the radio repeater BTS.

FIG. 5 shows the configuration of the communication control device 10 according to this embodiment. As shown in FIG. 5, the communication control device 10 includes a setting section 11, an allocation section 12, and a call control section 13. FIG.

The setting unit (priority setting unit) 11 performs settings required for the operation of the communication control unit 10 according to instructions from the operation monitoring control unit 20 . In particular, the setting unit 11 sets the priority order for allocating the communication channel of the radio relay device BTS to the user radio station ML. The priority indicates the order of selection of the radio repeater BTS (including communication carriers and communication channels) to be allocated when the user radio station ML is connected.

The setting unit 11 has a setting information storage unit 11a that stores setting information D0 for setting the priority order. FIG. 6 shows an example of the priority setting information D0. As shown in FIG. 6, the setting information D0 includes data indicating the number of priority setting and the priority. This example is an example of setting the priority of the wireless relay device and the carrier. For example, each priority has 4 bytes of information, and includes a relay station number indicating a relay station, a BTS number indicating a radio relay device within the relay station, and a carrier number indicating a carrier within the radio relay device. The priority may be the BTS number alone without the carrier number, or may include the channel number (slot number) indicating the channel within the carrier. Ordinarily, priority is given to radio repeater numbers in the same relay station and carrier numbers in the same radio repeater. In addition, an area code indicating an area, a network number indicating a network type, a control zone number indicating a communication control apparatus with which the user radio station has a contract, and the like may be included.

The allocation unit (channel allocation unit) 12 allocates the communication channel of the radio relay device BTS to the user radio station ML based on the priority order set by the setting unit 11 . For each connection of the user radio station ML (for example, S102 and S104 in FIG. 4), the allocation unit 12 selects the wireless relay device BTS (which may include a communication carrier and a communication channel) according to the priority of the setting information D0 of the setting unit 11. ) are sequentially selected, and an empty channel of the selected radio repeater BTS is assigned to the user radio station ML. The allocating unit 12 allocates communication channels in the order in which the user radio station ML establishes a communication connection with the radio relay device BTS, starting with the radio relay station having the preset highest priority. When the priority of the communication carrier of the radio repeater BTS is set, according to the priority, the communication carrier of the radio repeater BTS is selected and the vacant channel of the selected communication carrier is allocated. Further, when the priorities of the channels in the communication carrier of the radio relay device BTS are set, according to the priority, the available channels of the communication carrier channels of the radio relay device BTS are allocated. Furthermore, according to the priority of the radio relay devices BTS, any one of the radio relay devices BTS may be selected sequentially in a round-robin manner, or one of the radio relay devices BTS may be selected in descending order of available channels. (Select the one with the highest priority and the most free channels).

The call control unit 13 controls, among relay stations (radio relay devices BTS), connection of outgoing and incoming calls for communication (call) between user radio stations ML. The call control unit 13 establishes a communication connection if there is no problem with conditions such as authentication in response to the communication request from the user radio station ML. The call control unit 13 controls the call connection sequence as shown in FIG. For example, when a call request is received from the user radio station ML on the calling side (S101 in FIG. 4), the relay station on the called side is searched (S103 in FIG. 4), and the request is sent to the user radio station ML on the called side The incoming call is notified (S105).

FIG.7 shows the channel assignment operation in the radio communication system according to this embodiment, and FIGS.8 and 9 show examples of the operation. As shown in FIG. 7, first, the operation monitoring and control device 20 sets priorities for the communication control devices 10 (S201). The operation monitoring control device 20 inputs the setting information D0 including the priority as shown in FIG. 11a.

Subsequently, the user radio station ML requests communication to the radio repeater BTS in order to communicate with another user radio station ML (S202). The user radio station ML selects the common access channel CAC of the radio repeater BTS based on the user code of the user radio station ML, and sends a communication request (call) to the communication control apparatus 10 via the selected common access channel CAC. conduct.

Subsequently, the communication control device 10 allocates an empty channel of the radio relay device BTS to the user radio station ML based on the set priority (S203). The allocation unit 12 of the communication control device 10 selects the radio relay device BTS (carrier and channel) according to the order set in the setting information D0 by the setting unit 11, and allocates an empty channel to the user radio station ML.

After that, the user radio station ML performs communication (phone call) through the assigned channel (S204). The allocation unit 12 of the communication control device 10 sets channel allocation to the corresponding radio relay device BTS, and the user radio station ML performs radio communication via the set channel of the radio relay device BTS.

In the operation examples of FIGS. 8 and 9, the radio repeater BTS has 4 carriers and 16 channels of 4 slots for each carrier, as in FIG. Note that the configuration of the communication channels may be in accordance with the communication standard, and may be 32 channels with 8 carriers and 4 slots for each carrier.

In the example of FIG. 8, similar to FIG. 1, user radio stations ML#1, ML#3, ML#5, ML#6, and ML#7 select common access channel CAC#1, and user radio stations ML #4 selects common access channel CAC#2, and user radio station ML#2 selects common access channel CAC#3.

Assuming that the user radio stations ML#1 to ML#7 make communication requests (calls) in order, the user radio station ML#1 first accesses the common access channel CAC#1 of the radio relay device BTS#1. Then, based on the setting information D0, the communication control device 10 selects the carrier of the wireless relay device BTS#1 with priority 1 (the highest priority) among the available carriers in the relay station RS#1. 1 is selected, and the user individual channel USC (empty slot) of the selected carrier 1 is allocated to the user radio station ML#1 (S11). For example, according to the priority order of the setting information D0, the communication control device 10 selects carrier 1, which is the smallest number among the carriers with vacancies in the wireless relay device #1, which is the lowest number among the wireless relay devices in the same relay station. of user dedicated channels USC may be assigned.

Next, when the user radio station ML#2 accesses the common access channel CAC#3 of the radio relay device BTS#3, the communication control device 10 determines whether the relay station RS#1 is empty based on the setting information D0. carrier 1 of the radio relay device BTS#2 with priority 2 (the second highest priority) among the carriers currently in the network, and assigns the user individual channel USC of the selected carrier 1 to the user radio station ML#2 ( S12). For example, according to the priority order of the setting information D0, the communication control device 10 selects the carrier with the smallest number among the carriers with vacancies in the radio relay device #2 with the next lowest number among the radio relay devices in the same relay station. One user dedicated channel USC may be assigned.

Next, when the user radio station ML#3 accesses the common access channel CAC#1 of the radio relay device BTS#1, the communication control device 10 determines whether the relay station RS#1 is empty based on the setting information D0. carrier 1 of the radio relay device BTS#3 with priority 3 (the third highest priority) among the carriers currently in the network, and assigns the user dedicated channel USC of the selected carrier 1 to the user radio station ML#3 ( S13). For example, according to the priority order of the setting information D0, the communication control device 10 selects the carrier with the smallest number among the carriers with vacancies in the radio relay device #3 with the next lowest number among the radio relay devices in the same relay station. One user dedicated channel USC may be assigned.

Next, when the user radio station ML#4 accesses the common access channel CAC#2 of the radio relay device BTS#2, the communication control device 10 determines whether the relay station RS#1 is empty based on the setting information D0. carrier 2 of the radio relay device BTS#1 with priority 4 (fourth highest priority) among the carriers currently in the network, and assigns the user individual channel USC of the selected carrier 2 to the user radio station ML#4 ( S14). For example, since there is no radio relay device with the next lowest number among the communication control device 10 and the radio relay device in the same relay station, the radio relay device #1 in S11 may allocate the user individual channel USC of carrier 2, which is the next smallest number. .

Next, when the user radio station ML#5 accesses the common access channel CAC#1 of the radio relay device BTS#1, the communication control device 10 determines whether the relay station RS#1 is idle based on the setting information D0. carrier 2 of the radio relay device BTS#2 with priority 5 (fifth highest priority) among the carriers currently in use, and assigns the user individual channel USC of the selected carrier 2 to the user radio station ML#5 ( S15). For example, the communication control apparatus 10 may allocate the user individual channel USC of carrier 2, which is the next smallest number, in the radio relay apparatus #2 in S12.

Next, when the user radio station ML#6 accesses the common access channel CAC#1 of the radio relay device BTS#1, the communication control device 10 determines whether the relay station RS#1 is idle based on the setting information D0. carrier 2 of the radio relay device BTS#3 with priority 6 (sixth highest priority) among the carriers that are currently in service, and assigns the user individual channel USC of the selected carrier 2 to the user radio station ML#5 ( S16). For example, the communication control apparatus 10 may allocate the user dedicated channel USC of carrier 2, which is the next smallest number, in the radio relay apparatus #3 in S13.

Next, when the user radio station ML#7 accesses the common access channel CAC#1 of the radio relay device BTS#1, the communication control device 10 determines whether the relay station RS#1 is idle based on the setting information D0. carrier 3 of the radio relay device BTS#1 with priority 7 (seventh highest priority) among the carriers currently in the network, and assigns the user individual channel USC of the selected carrier 3 to the user radio station ML#7 ( S17). For example, as in S14, since there is no radio relay device within the same relay station with the next lowest number, the communication control device 10 selects the user individual channel of carrier 3, which is the next smallest number, in the radio relay device #1 of S11. A USC may be assigned.

The subsequent allocation order is as shown in FIG. That is, next, according to the order in which the other user radio stations ML accessed through any of the common access channels CAC#1 to #3, carrier 3 (S18) of the radio relay device BTS#2 and radio relay device BTS#3 carrier 3 (S19) of the radio relay device BTS#1, carrier 4 (S20) of the radio relay device BTS#1, carrier 4 (S21) of the radio relay device BTS#2, and carrier 4 (S22) of the radio relay device BTS#3.

As described above, in the present embodiment, the communication control apparatus allocates empty channels of the radio relay apparatus to the user radio station based on the set priority of the radio relay apparatus, thereby reducing communication resources of the relay station. Make effective use of it. That is, by giving priority to a plurality of wireless relay devices in the same relay station as the information held by the communication control device, user individual channels are not assigned only to wireless relay devices that have a common access channel, but in the same relay station. It is possible to allocate a user individual channel to other wireless relay devices that do not have a common access channel, and to share the communication channels of multiple wireless relay devices in the relay station. By sharing, the communication resources of the relay station are relatively increased, and the communication load and risk on one wireless relay device can be distributed. In addition, the above method does not require additional radio repeaters, which solves the problems of installation location and cost.

(Embodiment 2)
Next, Embodiment 2 will be described. In this embodiment, in addition to the configuration and operation of the first embodiment, priority is set in consideration of channel substitution. Proxy means to switch to another channel (carrier) and continue communication (call) when a failure occurs in a channel (carrier) during communication.

FIG. 10 shows the configuration of communication control apparatus 10 according to this embodiment. As shown in FIG. 10, the communication control apparatus 10 includes a setting unit 11, an allocation unit 12, a call control unit 13, a monitoring unit 14, and a proxy unit 15, as in FIG. 5 of the first embodiment. ing. In the present embodiment, the setting unit 11 sets priority in consideration of proxy as the setting information D0. For example, the priority of a substitute carrier (channel) is set lower than the priority of other carriers (channels). For example, in the example of the setting information D0 in FIG. 6 of Embodiment 1, the lowest priority 10 to 12 are set as substitute channels.

The monitoring unit 14 monitors failure of the radio relay device BTS. For example, the radio relay device BTS has a transmission/reception circuit for each carrier (frequency), and the monitoring unit 14 detects that a carrier (channel) failure has occurred due to a failure in the transmission/reception circuit of the radio relay device BTS. . When the monitoring unit 14 detects a failure in the radio relay device BTS, the proxy unit 15 switches the channel of the carrier in which the failure has occurred based on the setting information D0, and acts as a proxy for the channel.

FIG. 11 shows channel allocation and proxy operation in the wireless communication system according to this embodiment. As shown in FIG. 11, as in FIG. 7 of Embodiment 1, first, the operation monitoring control device 20 sets the priority order to the communication control device 10 (S201), and when the user radio station ML requests communication ( S202), the communication control device 10 assigns an empty channel of the radio relay device BTS to the user radio station ML based on the set priority (S203), and the user radio station ML performs communication using the assigned channel ( S204). In this embodiment, in S201, the setting unit 11 sets the priority of the substitute carrier (channel) to low, and in S203, the allocation unit 12 sets the high priority based on the set priority. Allocate a channel from a carrier (channel).

Subsequently, when a channel fault occurs in the radio relay device BTS (S205), the communication control unit 10 switches the channel of the radio relay device BTS based on the setting (S206), and performs the switching channel as a proxy (S207). . The monitoring unit 14 detects a carrier (channel) failure of the wireless relay device BTS, and the acting unit 15 switches the channel based on the setting information D0 to act as a substitute. The proxy unit 15 performs proxy using a carrier (channel) set to have a low priority for proxy.

Thus, in this embodiment, priority is set in consideration of substitution, and in particular, a channel with a low priority is set as a substitute channel. As a result, the probability that a proxy channel is assigned for communication can be reduced, so that the channel can be reliably switched and proxy communication can be performed when a failure occurs.

It should be noted that the present disclosure is not limited to the above embodiments, and can be modified as appropriate without departing from the scope of the present disclosure. For example, it is applicable not only to the MCA radio system but also to other public radio systems such as disaster prevention radio, fire fighting radio, and traffic radio. In such a system, as in the above-described embodiment, a wireless network having a common access channel with a user individual channel of each wireless relay device as a shared resource is controlled by a communication control device in a relay station having a plurality of wireless relay devices. It is possible to distribute communication users to a wireless relay device different from the relay device.

Each configuration in the above-described embodiments is configured by hardware or software, or both, and may be configured from one piece of hardware or software, or may be configured from multiple pieces of hardware or software. The functions (processing) of each device may be implemented by a computer having a CPU, memory, and the like. For example, a program for performing the method (channel allocation method) in the embodiment may be stored in a storage device, and each function may be realized by executing the program stored in the storage device by a CPU.

These programs can be stored and delivered to computers using various types of non-transitory computer readable media. Non-transitory computer-readable media include various types of tangible storage media. Examples of non-transitory computer-readable media include magnetic recording media (eg, flexible discs, magnetic tapes, hard disk drives), magneto-optical recording media (eg, magneto-optical discs), CD-ROMs (Read Only Memory), CD-Rs, CD-R/W, semiconductor memory (eg, mask ROM, PROM (Programmable ROM), EPROM (Erasable PROM), flash ROM, RAM (random access memory)). The program may also be delivered to the computer on various types of transitory computer readable medium. Examples of transitory computer-readable media include electrical signals, optical signals, and electromagnetic waves. Transitory computer-readable media can deliver the program to the computer via wired channels, such as wires and optical fibers, or wireless channels.

Some or all of the above-described embodiments can also be described in the following supplementary remarks, but are not limited to the following.
(Appendix 1)
a priority setting unit for setting priorities of a plurality of wireless relay devices that perform wireless communication using a multi-channel access method;
Channel assignment for allocating a communication channel of the wireless relay device to a wireless terminal using a control channel of one of the wireless relay devices, based on the set priority of the wireless relay device Department and
A radio communication control device.
(Appendix 2)
The priority setting unit sets priorities of a plurality of communication carriers in the plurality of wireless relay devices,
The channel allocation unit allocates the communication channel of the radio relay device based on the set priority of the communication carrier.
The radio communication control device according to appendix 1.
(Appendix 3)
wherein the priority order setting unit sets the priority order of a communication carrier for proxy communication among the plurality of communication carriers lower than the priority order of other communication carriers;
The radio communication control device according to appendix 2.
(Appendix 4)
The priority setting unit sets priorities of the plurality of communication channels in the plurality of communication carriers,
The channel allocation unit allocates the communication channel of the wireless relay device based on the set priority of the communication channel.
The radio communication control device according to appendix 2 or 3.
(Appendix 5)
The channel allocation unit sequentially selects one of the plurality of wireless relay devices for each connection of the wireless terminal based on the priority order, and allocates a communication channel to the selected wireless relay device.
5. The radio communication control device according to any one of Appendices 1 to 4.
(Appendix 6)
the channel allocation unit selects one of the plurality of wireless relay devices in a round-robin manner;
The radio communication control device according to appendix 5.
(Appendix 7)
The channel allocation unit selects one of the plurality of wireless relay devices in descending order of free communication channels.
The radio communication control device according to appendix 5.
(Appendix 8)
A wireless communication system comprising a wireless terminal, a plurality of wireless relay devices, and a wireless communication control device,
The radio communication control device,
a priority setting unit that sets a priority of the plurality of wireless relay devices that perform wireless communication using a multi-channel access method;
A channel for allocating a communication channel of the wireless relay device to the wireless terminal using a control channel of one of the plurality of wireless relay devices, based on the set priority of the wireless relay device. an allocation unit;
A wireless communication system comprising:
(Appendix 9)
The priority setting unit sets priorities of a plurality of communication carriers in the plurality of wireless relay devices,
The channel allocation unit allocates the communication channel of the radio relay device based on the set priority of the communication carrier.
The wireless communication system according to appendix 8.
(Appendix 10)
Setting the priority of multiple wireless relay devices that perform wireless communication by the multi-channel access method,
Allocating a communication channel of the wireless relay device to a wireless terminal that uses a control channel of one of the plurality of wireless relay devices, based on the set priority of the wireless relay device;
Channel allocation method.
(Appendix 11)
In setting the priority, setting the priority of a plurality of communication carriers in the plurality of wireless relay devices,
In the channel assignment, the communication channel of the wireless relay device is assigned based on the set priority of the communication carrier,
The channel allocation method according to appendix 10.
(Appendix 12)
Setting the priority of multiple wireless relay devices that perform wireless communication by the multi-channel access method,
Allocating a communication channel of the wireless relay device to a wireless terminal using a control channel of one of the plurality of wireless relay devices, based on the set priority of the wireless relay device;
A channel allocation program that causes a computer to execute processing.
(Appendix 13)
In setting the priority, setting the priority of a plurality of communication carriers in the plurality of wireless relay devices,
In the channel assignment, the communication channel of the wireless relay device is assigned based on the set priority of the communication carrier,
13. The channel allocation program according to appendix 12.

1, 2 wireless communication system 10, 90 communication control unit 11 setting unit 11a setting information storage unit 12 allocation unit 13 call control unit 14 monitoring unit 15 agent unit 20 operation monitoring control unit 100 wireless communication control unit 110 priority setting unit 120 channel Allocation unit BTS, BTS #1 to #5 Radio relay apparatus CAC, CAC #1 to #3 Common access channel D0 Setting information ML, ML #1 to #8 User radio station RS, RS #1 to #2 Relay station SA, SA#1 to S2 Service area USC User individual channel

Claims (8)

a priority setting unit for setting priorities of a plurality of wireless relay devices that perform wireless communication using a multi-channel access method;
Channel assignment for allocating a communication channel of the wireless relay device to a wireless terminal using a control channel of one of the wireless relay devices, based on the set priority of the wireless relay device Department and
with
The priority setting unit sets priorities of a plurality of communication carriers in the plurality of wireless relay devices,
The channel allocation unit allocates a communication channel for the radio relay device based on the set priority of the communication carrier;
moreover,
The priority setting unit sets priorities of the plurality of communication channels in the plurality of communication carriers,
The channel allocation unit allocates the communication channel of the wireless relay device based on the set priority of the communication channel.
Radio communication controller. wherein the priority order setting unit sets the priority order of a communication carrier for proxy communication among the plurality of communication carriers lower than the priority order of other communication carriers;
The radio communication control device according to claim 1. The channel allocation unit sequentially selects one of the plurality of wireless relay devices for each connection of the wireless terminal based on the priority order, and allocates a communication channel to the selected wireless relay device.
The radio communication control device according to claim 1 or 2. the channel allocation unit selects one of the plurality of wireless relay devices in a round-robin manner;
The radio communication control device according to claim 3. The channel allocation unit selects one of the plurality of wireless relay devices in descending order of free communication channels.
The radio communication control device according to claim 3. A wireless communication system comprising a wireless terminal, a plurality of wireless relay devices, and a wireless communication control device,
The radio communication control device,
a priority setting unit that sets a priority of the plurality of wireless relay devices that perform wireless communication using a multi-channel access method;
A channel for allocating a communication channel of the wireless relay device to the wireless terminal using a control channel of one of the plurality of wireless relay devices, based on the set priority of the wireless relay device. an allocation unit;
with
The priority setting unit sets priorities of a plurality of communication carriers in the plurality of wireless relay devices,
The channel allocation unit allocates a communication channel for the radio relay device based on the set priority of the communication carrier;
moreover,
The priority setting unit sets priorities of the plurality of communication channels in the plurality of communication carriers,
The channel allocation unit allocates the communication channel of the wireless relay device based on the set priority of the communication channel.
wireless communication system. Setting the priority of multiple wireless relay devices that perform wireless communication by the multi-channel access method,
assigning a communication channel of the wireless relay device to a wireless terminal using a control channel of one of the plurality of wireless relay devices, based on the set priority of the wireless relay device;
In setting the priority, setting the priority of a plurality of communication carriers in the plurality of wireless relay devices,
In allocating the communication channel, allocating the communication channel of the radio relay device based on the set priority of the communication carrier;
moreover,
setting the priorities of a plurality of communication channels in the plurality of communication carriers in setting the priorities;
In allocating the communication channel, allocating the communication channel of the wireless relay device based on the set priority of the communication channel;
Channel allocation method. Setting the priority of multiple wireless relay devices that perform wireless communication by the multi-channel access method,
Allocating a communication channel of the wireless relay device to a wireless terminal using a control channel of one of the wireless relay devices among the plurality of wireless relay devices, based on the set priority of the wireless relay device;
In setting the priority, setting the priority of a plurality of communication carriers in the plurality of wireless relay devices,
In allocating the communication channel, allocating the communication channel of the radio relay device based on the set priority of the communication carrier;
moreover,
setting the priorities of a plurality of communication channels in the plurality of communication carriers in setting the priorities;
In allocating the communication channel, allocating the communication channel of the wireless relay device based on the set priority of the communication channel;
A channel allocation program that causes a computer to execute processing.

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