JP2020036060A - Radio communication system and base station - Google Patents

Abstract

To improve simplicity and convenience in operation.SOLUTION: A radio communication system 100 for communicating with a plurality of terminals using a plurality of frequency bands comprises network path switching control means, acquiring means, baseband resource allocation control means, modulation and demodulation means, radio circuit control means, and sending means. The network path switching control means sets a network path for each of the plurality of frequency bands. The acquiring means acquires an IP packet corresponding to each of the plurality of frequency bands. The baseband resource allocation control means allocates a plurality of baseband units 25 for each of the plurality of frequency bands. The modulation and demodulation means converts each of a plurality of IP packets to a baseband signal using the baseband unit 25 allocated to the frequency band corresponding to the IP packet. The radio circuit control means independently sets parameters of a plurality of radio circuit parts 32 on the basis of the plurality of frequency bands. The sending means converts each of the plurality of baseband signals to an analog signal using the radio circuit part 32, and sends the analog signal to a terminal 9.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a wireless communication system that communicates with a plurality of terminals using a plurality of frequency bands, and a base station.

  In recent years, movements utilizing technologies such as private LTE (Long Term Evolution) have spread worldwide in mission-critical usage scenes. Specific applications include, for example, remote operation video transmission of heavy machinery at a vast work site, power generation monitoring in a smart grid, subway operation management, and the like. Such applications require high reliability and ultra-low delay, in addition to wide area coverage, and are difficult to realize with conventional technologies (for example, Wi-Fi (registered trademark)). For this reason, there is a case where a right of a frequency in a blind area where a cellular system infrastructure is not constructed is transferred from a communication carrier, and a private LTE system or the like is constructed as a self-owned infrastructure. Such private LTE and the like are actively introduced in countries where resale and lending of the right to the frequency are permitted.

  At present, the operating frequency of private LTE is mainly 6 GHz. On the other hand, with the commercialization of the communication technology using the millimeter wave band in 5G, it is considered that the usage form and the provided services of the private LTE will be diversified. Particularly, in the millimeter wave band, high-speed, large-capacity, low-latency communication can be provided as compared with the related art, so that advanced and advanced services are expected to be provided. However, when the millimeter wave band is used, propagation loss is large, and it is necessary to install many base stations to cover a large area. In addition to the above, for handover between base stations, it is necessary to apply an existing C / U separation technology and send a control signal at a frequency of 6 GHz or less.

  In addition, when developing different services utilizing multiple frequency bands in a unified manner in the millimeter wave band and frequency bands different from the millimeter wave band, communication is performed using different frequency bands, and interference between services is performed. Need to be avoided. In order to satisfy these demands, a base station capable of controlling a plurality of frequency bands used for the service and independently controlling each of them is required. On the other hand, since the private LTE base station needs to be operated flexibly according to the environment and the use situation, portability may be required. As described above, when a private LTE base station is used, an inexpensive and compact design that pursues simplicity and convenience in operation is required.

  Here, conventional cellular communication and, for example, a base station disclosed in Patent Document 1 mainly include a baseband unit, a radio unit, and a control unit (base station control unit). The baseband unit converts an IP packet including information to be transmitted to a user terminal or the like into a baseband signal. The wireless unit converts a baseband signal into an analog signal and transmits the analog signal to a user terminal or the like. The control unit controls the baseband unit and the radio unit. Such base stations are commercially deployed, and many of these base stations are accommodated in cabinets. For example, the scale of the radio unit increases or decreases due to multiple sector support or MIMO (Multiple-Input and Multiple-Output) support, but a compact base station that supports three sectors in a single frequency band is realized and installation work is simplified. And space saving of the installation place is realized. Furthermore, an LTE-compatible ultra-small base station called a femtocell base station has been commercialized. By introducing the base station indoors such as a residence, a store, and an office, it is possible to support about several tens of meters as a communication area.

JP 2018-85606 A

  However, for example, in communication using a 5G millimeter wave band, it is assumed that more base stations need to be installed. Further, since the scale of the baseband signal processing is increased, the scale is increased as compared with the above-described conventional baseband unit, control unit, and the like. For this reason, it is difficult for the base station and the like disclosed in Patent Document 1 and the like to realize simplicity and convenience in operation.

  As a countermeasure for this, for example, there is a technique called overhanging installation. In this technique, a radio unit and a baseband unit including a baseband unit (BBU) are separately installed. The radio unit is called RRH (Remote Radio Head), and only RRHs are installed in necessary places and BBUs connected to a plurality of RRHs are aggregated to simplify base station installation and reduce space. Becomes possible. However, this technique is limited to a case where a sufficient space for installing a large-scale BBU can be secured. For this reason, it is difficult to realize simplicity and convenience in operation.

  In addition to the above countermeasures, for example, a technology for sharing resources of a network and a physical layer can be mentioned. The multi-user access technology used in the conventional LTE as resource sharing of the physical layer uses a plurality of user terminals by allocating a resource block composed of a plurality of OFDM (Orthogonal Frequency Division Multiplexing) subcarriers to each user. Enable simultaneous access. However, this technique shares resources in the same frequency band and cannot be applied to users (terminals) in different frequency bands. The network resource sharing technology is based on a heterogeneous multi-layer network configuration in 5G. Based on the network sharing technology by slicing, etc., the physical installation location and the hardware itself are changed to a cellular communication carrier. This makes it possible to reduce the installation cost and the like. However, at present, although the physical layers such as the baseband unit and the wireless unit are incorporated as part of the redefinable network configuration, a fixed physical layer is implemented for each application or communication system, and they are switched according to the scenario. Configuration. Therefore, when operating in a plurality of frequency bands simultaneously, it is necessary to implement a fixed physical layer for each frequency band. For this reason, it is difficult to realize simplicity and convenience in operation.

  Here, the private LTE is a technology in which a company or an organization uses LTE for a private network. A simple and inexpensive design is required for the baseband unit including the wireless unit and the BBU since it is necessary to easily introduce the unit from one unit. However, for example, a private LTE base station corresponding to the millimeter wave band needs to process high-speed, large-capacity communication in the millimeter wave band, and thus the size of the BBU becomes significantly larger than before. A more advanced use is to use frequencies according to the application.To communicate simultaneously in multiple frequency bands, it is necessary to implement sufficient baseband signal processing circuits for communication in each frequency band And the equipment cost increases. This shows the same tendency when the radio unit using RRH and the BBU separation technology are applied.

  In addition to the above, private LTE base stations may be installed in spots for large-scale events and the like, and portability is also required. For this reason, private LTE base stations are expected to have requirements for miniaturization, weight reduction, power saving, etc., which lead to simplicity and convenience in operation. They tend to be more difficult than stations.

  Therefore, the present invention has been devised in view of the above-described problems, and has as its object to provide a radio communication system and a radio communication system capable of improving simplicity and convenience in operation. To provide stations.

  The present inventors have invented a wireless communication system and a base station that perform communication with a plurality of terminals using a plurality of frequency bands in order to solve the above-described problems. The wireless communication system includes: a network path switching control unit that sets a network path for each of a plurality of frequency bands; an acquisition unit that obtains an IP packet corresponding to each of a plurality of frequency bands; A baseband resource allocation control means for allocating each band; a modulation / demodulation means for converting each of the plurality of IP packets into a baseband signal using a baseband unit allocated to a frequency band corresponding to the IP packet; Wireless circuit control means for independently setting parameters of a plurality of wireless circuit units based on a frequency band, and transmitting means for converting each of the plurality of baseband signals into an analog signal using a wireless circuit unit and transmitting the analog signal to a terminal And the following.

  A wireless communication system according to a first aspect of the present invention is a wireless communication system that communicates with a plurality of terminals using a plurality of frequency bands, and includes a network path switching control unit that sets a network path for each of the plurality of frequency bands. Acquiring means for acquiring an IP packet corresponding to each of the plurality of frequency bands; baseband resource allocation control means for assigning a plurality of baseband units to each of the plurality of frequency bands; Using the baseband unit assigned to the frequency band corresponding to the IP packet, modulating / demodulating means for converting the baseband signal into baseband signals, and independently controlling parameters of a plurality of radio circuit units based on the plurality of frequency bands. Radio circuit control means to set, each of the plurality of baseband signals, using the radio circuit unit Transmission means for converting the analog signal transmitted to the terminal, characterized in that it comprises a.

  The wireless communication system according to a second invention is the wireless communication system according to the first invention, wherein the network path switching control unit and the baseband resource allocation control are provided to a base station having a plurality of the baseband units and a plurality of the wireless circuit units. And a setting means for generating a condition signal including a control condition in at least one of the means and the radio circuit control means, and the base station acquiring the condition signal.

  In a wireless communication system according to a third aspect, in the second aspect, the setting unit includes a plurality of the base stations, a connection information acquisition unit that acquires connection information indicating a communication status with the plurality of terminals, Generating means for generating the condition signal for each of the plurality of base stations based on the connection information; and condition signal transmitting means for transmitting the condition signal to each of the plurality of base stations via a network core. It is characterized by.

  In a wireless communication system according to a fourth invention, in the second invention or the third invention, the condition signal is an order in which the network path switching control unit, the baseband resource allocation control unit, and the wireless circuit control unit are executed. It is characterized by including.

  In a wireless communication system according to a fifth aspect, in any one of the first to fourth aspects, the network path switching control unit, the baseband resource allocation control unit, and the wireless circuit control unit may control any one of the first to fourth aspects. Another control means is executed based on the control condition executed by the means, and the remaining control means is executed based on the control condition executed by the other control means.

  A base station according to a sixth aspect of the present invention is a base station that communicates with a plurality of terminals using a plurality of frequency bands, and a network path switching control unit that sets a network path for each of the plurality of frequency bands; A transmission line interface unit that acquires an IP packet corresponding to each of the frequency bands, a baseband resource allocation control unit that allocates a plurality of baseband units to each of the plurality of frequency bands, and a plurality of the baseband units. A baseband unit that converts each of the plurality of IP packets into a baseband signal using the baseband unit assigned to the frequency band corresponding to the IP packet; A wireless circuit control unit that independently sets parameters of a plurality of wireless circuit units, Les and characterized in that it comprises a plurality of said radio circuit section to be transmitted to the terminal into an analog signal.

  According to the present invention having the above-described configuration, the baseband resource allocation control unit allocates a plurality of baseband units for each of a plurality of frequency bands. Therefore, when communicating with multiple terminals using multiple frequency bands, the baseband unit can be shared based on the communication environment with the terminal, and the number of baseband units can be minimized. it can. This makes it possible to achieve simplicity and convenience in operation. Therefore, requirements such as miniaturization, weight reduction, and power saving in a private LTE base station can be satisfied.

  Further, according to the present invention having the above-described configuration, the setting unit generates a condition signal based on the connection information acquired from the plurality of base stations, and transmits the generated condition signal to each of the plurality of base stations. Therefore, control conditions can be changed for each base station based on the communication status between each base station and the terminal. This makes it possible to maintain an optimal communication environment even when the number and types of terminals vary between base stations.

  Further, according to the present invention having the above-described configuration, the condition signal includes an order in which the network path switching control unit, the baseband resource allocation control unit, and the radio circuit control unit are executed. Therefore, it is possible to easily set a control condition suitable for a communication state with the terminal. This makes it possible to maintain an optimal communication environment even when the number and types of terminals fluctuate.

  Further, according to the present invention having the above-described configuration, the network path switching control means, the baseband resource allocation control means, and the radio circuit control means perform the other one based on the control condition executed by any one of the means. One control unit is executed, and the remaining control units are executed based on the control conditions executed by the other control unit. For this reason, each control means can be executed based on the restrictions accompanying the execution of each control means. Thereby, it is possible to easily set the optimum communication conditions according to the communication environment.

  According to the present invention having the above configuration, the baseband resource allocation control unit allocates a plurality of baseband units for each of a plurality of frequency bands. Therefore, when communicating with multiple terminals using multiple frequency bands, the baseband unit can be shared based on the communication environment with the terminal, and the number of baseband units can be minimized. it can. This makes it possible to achieve simplicity and convenience in operation. Therefore, requirements such as miniaturization, weight reduction, and power saving in a private LTE base station can be satisfied.

FIG. 1 is a schematic diagram illustrating an example of the wireless communication system according to the first embodiment. FIG. 2 is a schematic diagram illustrating an example of an architecture configuration of the wireless communication system according to the first embodiment. FIG. 3 is a schematic diagram illustrating an example of a baseband unit and a wireless circuit unit. FIG. 4A is a flowchart illustrating an example of the operation of the wireless communication system according to the first embodiment, and FIG. 4B is a flowchart illustrating another example of the operation of the wireless communication system according to the first embodiment. is there. FIG. 5A is a flowchart illustrating a modification of the operation of the wireless communication system according to the first embodiment. FIG. 6 is a schematic diagram illustrating an example of the wireless communication system according to the second embodiment. FIG. 7 is a flowchart illustrating an example of the operation of the wireless communication system according to the second embodiment. FIG. 8 is a schematic diagram illustrating a usage example of the wireless communication system in each embodiment. FIGS. 9A and 9B are schematic diagrams illustrating a usage example of the wireless communication system in the second embodiment.

(First embodiment: wireless communication system 100, base station 1)
Hereinafter, the wireless communication system 100 and the base station 1 as embodiments of the present invention will be described in detail. FIG. 1 is a schematic diagram illustrating an example of a wireless communication system 100 according to the present embodiment, and FIG. 2 is a schematic diagram illustrating an example of an architecture configuration of the wireless communication system 100 according to the present embodiment. The solid arrows in FIG. 2 mainly indicate control relationships, the open solid arrows mainly indicate data (signal) transmission / reception relationships, and the open dashed arrows mainly indicate control relationships via other components. Is shown.

  The wireless communication system 100 includes, for example, a base station 1 as illustrated in FIG. The wireless communication system 100 is used when communicating with a plurality of terminals 9 using a plurality of frequency bands including a millimeter wave band and the like. The wireless communication system 100 includes a network core such as the EPC 5 connected to the base station 1 and is used as a system such as a private LTE. Here, “communication” means that, for example, a predetermined signal (information) is transmitted from the base station 1 to the terminal 9 or the like, and the base station 1 receives a predetermined signal transmitted from the terminal 9 or the like. May be included.

  The base station 1 includes a control / baseband unit 2, a radio unit 3, and a storage unit 4, and each component is connected by an internal bus. The base station 1 is for communicating with a plurality of terminals 9 as shown in FIG. 2, for example. The base station 1 may be connected to the external network core 6 via, for example, an external network in addition to being connected to the EPC 5. The base station 1 obtains a control signal and the like from the private network server 7 connected to the EPC 5, for example.

  The base station 1 acquires a known IP packet from the private network server 7 or the like via the EPC 5, for example, and transmits an analog signal based on the IP packet to the terminal 9. The base station 1 can share a baseband resource (a baseband unit 25 described later) based on a plurality of frequency bands used for communication with the terminal 9. Therefore, an increase in the size of the baseband circuit can be suppressed.

  A plurality of frequency bands used for communication with the terminal 9 are set in the base station 1 in advance by an administrator or the like. In addition, depending on the communication status between the base station 1 and the terminal 9, for example, a private network via the EPC 5 is used. The base station 1 may be set from the server 7 or the like, or the base station 1 itself may be set according to the communication status with the terminal 9. By setting a frequency band in the base station 1, sharing of baseband resources can be controlled, and a network path to be connected and parameters of the radio circuit unit 32 used for communication with the terminal 9 are set. be able to.

  The control / baseband unit 2 includes a network path switching control unit 21, a transmission line interface unit 22, a baseband resource allocation control unit 23, a baseband unit 24, and a base station control unit 26. A timing control unit 27 may be provided. The control / baseband unit 2 can also control communication conditions with the terminal 9 in the wireless unit 3 and the like.

  The network path switching control unit 21 sets a network path for each of a plurality of frequency bands used for communication. The network path switching control unit 21 may set a different network path for each frequency band, or may set an equal network path for some frequency bands. In addition to the EPC 5 being set as the network path, for example, the external network core 6 may be set.

  The transmission line interface unit 22 connects to the network path set by the network path switching control unit 21 and acquires an IP packet corresponding to each of a plurality of frequency bands. The transmission line interface unit 22 processes a protocol such as IPsec (Security Architecture for Internet Protocol) and IPv6 (Internet Protocol Version 6) to acquire an IP packet. The transmission line interface unit 22 may acquire the IP packet stored in the storage unit 4, for example.

  The baseband resource allocation control unit 23 allocates a plurality of baseband units 25 described later for each of a plurality of frequency bands. The baseband resource allocation control unit 23 may allocate a plurality of baseband units 25 to one frequency band of a baseband signal.

  The baseband unit 24 has a plurality of baseband units 25 (25-1, 25-2,..., 25-n (n is a positive number) in FIGS. Convert to The baseband unit 25 converts an IP packet into a baseband signal by executing at least one of encoding, decoding, modulation, demodulation, multiplexing, and demultiplexing. The baseband unit 25 converts an IP packet corresponding to the frequency band allocated by the baseband resource allocation control unit 23 into a baseband signal. Each baseband unit 25 or baseband unit 24 may be specifically realized by using hardware resources such as a baseband processor, for example, and includes a baseband processor, a known memory including a memory for storing a communication control program, and the like. It may be specifically realized by using the module of (1).

  The base station control unit 26 performs control of the entire base station 1 and a protocol of call control, and supervision control. As the base station control unit 26, for example, a CPU (Central Processing Unit) or a DSP (Digital Signal Processor) is used.

  The base station control unit 26 acquires a condition signal including a control condition in the network path switching control unit 21, the baseband resource allocation control unit 23, and a radio circuit control unit 31 described later, and based on the condition signal, each control unit 21, 23 and 31 are controlled. The base station control unit 26 acquires a condition signal from the private network server 7 connected to the EPC 5, for example. The condition signal includes information on a plurality of frequency bands used for communication, information on the order in which the control units 21, 23, and 31 are executed, and information on the number and types of the terminals 9, for example. Is also good.

  The timing control unit 27 generates various clocks used in the base station 1 based on a GPS (not shown) and a reference clock acquired via the transmission line interface unit 22.

  The wireless unit 3 includes a wireless circuit control unit 31 and a plurality of wireless circuit units 32. The wireless unit 3 may be specifically realized using, for example, an existing RF module. As the wireless unit 3, for example, an existing RRH may be used. In this case, at least a part of the wireless unit 3 may be installed separately from the control / baseband unit 2.

  The wireless circuit control unit 31 independently sets parameters of the plurality of wireless circuit units 32 based on a plurality of frequency bands used for communication. The parameters of the wireless circuit unit 32 include, for example, at least one of a carrier frequency, transmission power, and a frequency bandwidth.

  The plurality of radio circuit units 32 (32-1, 32-2,..., 32-m (m is a positive number) in FIGS. 1 and 2) correspond to the plurality of baseband signals converted by the baseband unit 24. Each is converted to an analog signal. Each of the plurality of wireless circuit units 32 has an antenna 33 (33-1, 33-2,..., 33-m in FIG. 2), and transmits an analog signal to the terminal 9 via the antenna 33.

  One radio circuit unit 32 may acquire a baseband signal from one baseband unit 25, or may acquire a baseband signal from a plurality of baseband units 25 allocated in one frequency band, for example. In the wireless circuit unit 32, the baseband unit 25 for acquiring a baseband signal may be set in advance, or may be set by the wireless circuit control unit 31, for example.

  Here, for example, as shown in FIG. 3, a case will be described in which the base station 1 has five baseband units 25-1 to 25-5 and two radio circuit units 32-1 and 32-2. In FIG. 3, two baseband units 25-1, 25-2 are allocated to one frequency band, and three baseband units 25-3, 25-4, 25-5 are allocated to another frequency band. Is assumed. In this case, the radio circuit unit 32-1 acquires the baseband signals converted by the baseband units 25-1 and 25-2, and the radio circuit unit 32-2 sets the baseband units 25-3 and 25-4. , 25-5.

  Each of the radio circuit units 32-1 and 32-2 converts a baseband signal into an analog signal using, for example, an IF Board and an RF Board, and transmits the analog signal to the terminal 9 via the antennas 33-1 and 33-2. Note that the radio circuit unit 32 can convert the baseband signal into an analog signal by using a known technique (for example, a known IF Board or RF Board).

  Each baseband unit 25 in FIG. 3 corresponds to, for example, 20 MHz, and when the frequency band used for communication is two bands of 40 MHz and 60 MHz, the two baseband units 25-1 and 25-2 are allocated to the 40 MHz band. The three baseband units 25-3, 25-4, and 25-5 can be allocated to a 60 MHz band. When the frequency band used for communication fluctuates to 20 MHz and 80 MHz, one baseband unit 25-1 is allocated to a 20MHz band, and four baseband units 25-2, 25-3, 25-4, 25- are allocated. 5 can be allocated to the 80 MHz band. Thus, it is possible to correspond to each frequency band without increasing the number of baseband units 25.

  Various information acquired by the base station 1 is stored in the storage unit 4. The storage unit 4 includes, for example, a RAM (Random Access Memory) and a ROM (Read Only Memory), and stores a program executed by the base station control unit 26 and the like. The functions included in each of the above-described configurations can be realized by causing the base station control unit 26 to execute a program stored in the storage unit 4 using the RAM as a work area.

(First Embodiment: Operation of Wireless Communication System 100)
Next, an operation of the wireless communication system 100 according to the present embodiment will be described. FIG. 4A is a flowchart illustrating an example of an operation of the wireless communication system 100 according to the present embodiment.

  First, information on a plurality of frequency bands used for communication between the base station 1 and the terminal 9 is obtained. For example, the base station control unit 26 acquires a condition signal including information on a plurality of frequency bands from the private network server 7 or the like via the EPC 5. The condition signal includes, for example, the order in which the control units S110, S130, and S150 described below are executed, in addition to the information on the plurality of frequency bands.

  The base station control unit 26 controls the timing and the like of each control unit S110, S130, S150 based on the condition signal. The condition signal may be stored in, for example, the storage unit 4 or may be input to the base station 1 by an administrator or the like. In this case, the condition signal is extracted from the storage unit 4 when executing each of the control means S110, S130, and S150.

<Network path switching control means S110>
Thereafter, a network path is set for each of a plurality of frequency bands (network path switching control means S110). The network path switching control unit 21 sets a network path connected to the transmission path interface unit 22 for each of a plurality of frequency bands. By setting a network route for each frequency band, it becomes possible to obtain an IP packet for each frequency band.

<Acquisition unit S120>
Next, an IP packet corresponding to each frequency band is acquired (acquisition unit S120). The transmission path interface unit 22 acquires an IP packet via a network path corresponding to each frequency among the connected network paths.

<Baseband resource allocation control means S130>
Next, a plurality of baseband units 25 are allocated for each of a plurality of frequency bands (baseband resource allocation control means S130). The baseband resource allocation control unit 23 allocates at least one baseband unit 25 based on each of a plurality of frequency bands. For example, when using two types of frequency bands, the baseband resource allocation control unit 23 allocates a plurality of baseband units 25 to two groups. Note that the baseband resource allocation control unit 23 may not allocate some baseband units 25 to each group, for example, in case a frequency band to be used increases.

<Modulation / demodulation means S140>
Next, each of the plurality of IP packets is converted into a baseband signal using the baseband unit 25 assigned to the frequency band corresponding to the IP packet (modulation / demodulation means S140). Each baseband unit 25 acquires an IP packet corresponding to the allocated frequency band via the transmission line interface unit 22 and converts the packet into a baseband signal.

<Wireless circuit control means S150>
Next, the parameters of the plurality of wireless circuit units 32 are independently set based on the plurality of frequency bands (wireless circuit control unit S150). The radio circuit control unit 31 sets, for example, in which radio band a baseband signal corresponding to the radio circuit unit 32 is acquired. The radio circuit control unit 31 may set some radio circuit control units 31 so as not to acquire the baseband signal, for example, in case that the frequency band to be used increases.

<Transmitting means S160>
Next, each of the plurality of baseband signals is converted into an analog signal using the wireless circuit unit 32 and transmitted to the terminal 9 (transmitting unit S160). The wireless circuit unit 32 acquires the baseband signal set by the wireless circuit control unit 31 and converts the signal into an analog signal. At this time, the radio circuit unit 32 converts the baseband signal into an analog signal based on the frequency band corresponding to the converted baseband signal. The wireless circuit unit 32 transmits an analog signal to the terminal 9 corresponding to the above frequency band via the antenna 33.

  The operation of the wireless communication system 100 according to the present embodiment ends by executing the above-described units. Note that, after the transmission unit S160, at least one of the units S110 to S160 may be executed a plurality of times.

  Note that the order of the operations described above is an example, and the network path switching control unit S110 may be executed before the acquisition unit S120, and the baseband resource allocation control unit S130 is executed before the modem unit S140. The radio circuit control means S150 may be executed before the transmission means S160, and the order in which the control means S110, S130, and S150 are executed is arbitrary. For example, as shown in FIG. 4B, after executing the network path switching control unit S110, the baseband resource allocation control unit S130, and the radio circuit control unit S150, the acquisition unit S120, the modem unit S140, and the transmission unit S160. May be executed.

  Further, the network path switching control means S110, the baseband resource allocation control means S130, and the radio circuit control means S150 perform other operations based on the control conditions executed by any one of the control means (for example, the network path switching control means S110). (For example, the baseband resource allocation control means S130) is executed, and the remaining control means (for example, the radio circuit control means S150) are executed based on the control conditions executed by the other control means. Is also good. As a result, it is possible to prevent non-regulated communications from being executed in a frequency band including, for example, communication regulations. Further, it is possible to reduce the time spent on each control means. The “execution” of each of the above-described control means S110, S130, and S150 includes a case where the control condition and the like are changed and a case where the control condition and the like are not changed. That is, for example, based on the control condition executed by the network path switching control unit S110, the baseband resource allocation control unit S130 does not change the allocation of the baseband unit 25 (for example, keep the current status), or the radio circuit control unit S150. Does not change the parameter of the wireless circuit unit 32 (for example, keep the current state).

  According to the present embodiment, the baseband resource allocation control unit S130 allocates a plurality of baseband units 25 for each of a plurality of frequency bands. For this reason, when communicating with a plurality of terminals 9 using a plurality of frequency bands, the baseband unit 25 can be shared based on the communication environment with the terminal 9 and the number of baseband units 25 can be minimized. Can be suppressed. This makes it possible to achieve simplicity and convenience in operation. Therefore, for example, requirements such as miniaturization, weight reduction, and power saving of the private LTE base station 1 can be satisfied.

  Further, according to the present embodiment, the network path switching control unit S110, the baseband resource allocation control unit S130, and the radio circuit control unit S150 perform another one of the operations based on the control condition executed by any one of the control units. One control unit is executed, and the remaining control units are executed based on the control conditions executed by the other control unit. For this reason, each control means can be executed based on the restrictions accompanying the execution of each control means. Thereby, it is possible to easily set the optimum communication conditions according to the communication environment.

  Further, according to the present embodiment, the baseband resource allocation control unit 23 allocates a plurality of baseband units 25 for each of a plurality of frequency bands. For this reason, when communicating with a plurality of terminals 9 using a plurality of frequency bands, the baseband unit 25 can be shared based on the communication environment with the terminal 9 and the number of baseband units 25 can be minimized. Can be suppressed. This makes it possible to achieve simplicity and convenience in operation. Therefore, for example, requirements such as miniaturization, weight reduction, and power saving of the private LTE base station 1 can be satisfied.

(First Embodiment: Modification of Operation of Wireless Communication System 100)
Next, a modified example of the operation of the wireless communication system 100 according to the present embodiment will be described. FIG. 5 is a flowchart illustrating a modification of the operation of the wireless communication system 100 according to the present embodiment.

  The difference between the above-described example of the operation and the modification is that a setting unit S170 is further provided. Note that the description of the same contents as those of the above-described example of the operation is omitted.

<Setting means S170>
The setting unit S170 is executed to generate a condition signal including at least one of the control conditions of the network path switching control unit S110, the baseband resource allocation control unit S130, and the radio circuit control unit S150. Note that the setting unit S170 may be executed after at least a part of each of the units S110 to S160 described above is executed, and then at least one of the control units S110, S130, and S150 may be executed.

  The setting unit S170 generates a condition signal including control conditions in at least one of the network path switching control unit S110, the baseband resource allocation control unit S130, and the radio circuit control unit S150. The setting means S170 is executed by the base station control unit 26 or may be executed by the private network server 7, for example. In any case, the setting unit S170 allows the base station 1 to acquire the condition signal.

  When the setting unit S170 is executed by the private network server 7, the setting unit S170 includes a connection information acquisition unit S171, a generation unit S172, and a condition signal transmission unit S173.

<Connection information acquisition means S171>
The connection information acquisition unit S171 acquires connection information indicating the communication status between the base station 1 and the plurality of terminals 9. The private network server 7 acquires connection information from the base station 1 or the terminal 9. The private network server 7 acquires the connection information at regular intervals, for example. The connection information includes information on the frequency band used for communication and also includes, for example, the number and type of the communicating terminals 9.

<Generation means S172>
Next, a condition signal is generated based on the connection information (generating means S172). For example, when it is determined that a change has occurred in the connection information, the private network server 7 generates a condition signal according to the change in the connection information. For example, when it is necessary to change the frequency band used for communication, or when the number of communicating terminals 9 changes, the private network server 7 generates a condition signal.

<Condition signal transmitting means S173>
Next, a condition signal is transmitted to the base station 1 via the network core (condition signal transmitting means S173). The private network server 7 transmits a condition signal to the base station 1 via the EPC 5, for example. The base station control unit 26 acquires the condition signal and controls the timing of the network path switching control unit S110, the baseband resource allocation control unit S130, and the radio circuit control unit S150 as necessary.

  After that, the above-described control means S110, S130, S150 and the respective means S120, S140, S160 are appropriately executed, and the operation of the wireless communication system 100 in the present embodiment ends.

  According to this modification, the condition signal includes the order of executing the network path switching control unit S110, the baseband resource allocation control unit S130, and the radio circuit control unit S150. Therefore, it is possible to easily set a control condition suitable for a communication state with the terminal 9. This makes it possible to maintain an optimal communication environment even when the number and types of the terminals 9 fluctuate.

(Second embodiment: wireless communication system 200)
Next, a wireless communication system 200 according to the second embodiment will be described. FIG. 6 is a schematic diagram illustrating an example of the wireless communication system 200 according to the present embodiment.

  The difference between the above-described embodiment and the second embodiment is that a plurality of base stations 1 are provided. The description of the same contents as in the above-described embodiment will be omitted.

  In the wireless communication system 200, for example, a plurality of base stations 1 (base stations 1-1, 1-2,..., 1-p (p is a positive number) in FIG. Connected to server 7. In this case, the private network server 7 generates a condition signal for controlling the plurality of base stations 1 and transmits the condition signal to each base station 1. The EPC 5 is connected to, for example, the external network 8, and the plurality of base stations 1 can be connected to the external network 8 via the EPC 5. In addition, each base station 1 may be connected to one EPC 5, and the EPC 5 may be separately mounted on at least a part of the base station 1.

(Second embodiment: operation of wireless communication system 200)
Next, an operation of the wireless communication system 200 according to the present embodiment will be described. FIG. 7 is a flowchart illustrating an example of the operation of the wireless communication system 200 according to the present embodiment.

  The difference between the modified example of the above-described embodiment and the second embodiment is that a condition signal is generated for each of the plurality of base stations 1. The description of the same contents as those of the modified example of the embodiment described above is omitted.

<Setting means S270>
The setting unit S270 is configured to control the network path switching control unit S110, the baseband resource allocation control unit S130, and the radio circuit control unit S150 in each base station 1 based on the communication status between the plurality of base stations 1 and the plurality of terminals 9. This is executed to generate a condition signal including at least one control condition. The setting unit S270 can generate a condition signal based on the communication status of the plurality of base stations 1, so that control in consideration of the balance between the base stations 1 can be realized. After at least one of the units S110 to S160 has been executed in at least one base station 1, the setting unit S270 is executed. Thereafter, in the at least one base station 1, each of the control units S110, At least one of S130 and S150 may be executed.

  The setting unit S270 is executed by the private network server 7, and the setting unit S270 includes a connection information acquisition unit S271, a generation unit S272, and a condition signal transmission unit S273.

<Connection information acquisition means S271>
The connection information acquisition unit S271 acquires connection information indicating a communication status between the plurality of base stations 1 and the plurality of terminals 9. The private network server 7 acquires connection information from the plurality of base stations 1 or the plurality of terminals 9.

<Generation means S272>
Next, a condition signal is generated for each of the plurality of base stations 1 based on the connection information (generating means S272). For example, when the terminal 9 needs to end communication with the base station 1-1 and start communication with the base station 1-2, the private network server 7 generates a condition signal.

<Condition signal transmitting means S273>
Next, a condition signal is transmitted to each of the plurality of base stations 1 via the network core (condition signal transmitting means S273). The private network server 7 transmits a condition signal to each base station 1 via, for example, the EPC 5. Each base station control unit 26 acquires a condition signal, and controls the timing of the network path switching control unit S110, the baseband resource allocation control unit S130, and the radio circuit control unit S150 as necessary.

  After that, the control means S110, S130, S150 and the means S120, S140, S160 described above are appropriately executed by at least one base station 1, and the operation of the wireless communication system 200 in the present embodiment ends.

  According to the present embodiment, similarly to the above-described embodiment, the baseband resource allocation control unit S130 allocates a plurality of baseband units 25 for each of a plurality of frequency bands. For this reason, when communicating with a plurality of terminals 9 using a plurality of frequency bands, the baseband unit 25 can be shared based on the communication environment with the terminal 9 and the number of baseband units 25 can be minimized. Can be suppressed. This makes it possible to achieve simplicity and convenience in operation. Therefore, for example, requirements such as miniaturization, weight reduction, and power saving of the private LTE base station 1 can be satisfied.

  According to the present embodiment, the setting unit S270 generates a condition signal based on the connection information acquired from the plurality of base stations 1, and transmits the generated condition signal to each of the plurality of base stations 1. Therefore, the control conditions can be changed for each base station 1 based on the communication status between each base station 1 and the terminal 9. This makes it possible to maintain an optimal communication environment even when the number and types of terminals 9 fluctuate between base stations 1.

  According to the present embodiment, for example, the base stations 1 can cooperate with each other in the network configuration shown in FIG. 6, and baseband resources can be more efficiently utilized. Each base station 1 can independently combine the setting of the baseband unit 25 and the setting of the wireless circuit unit 32. Further, for example, various settings can be executed for each base station 1 in accordance with control information from a private network server 7 installed by a business operator that operates a private network constructed in private LTE.

  Also, for example, connection information and the like collected by each base station 1 with the terminal 9 are notified to the private network server 7, and the private network server 7 sets baseband resource allocation and the like of each base station 1 based on the acquired information. (For example, the setting unit S270). With such cooperative control, operation is possible in which the baseband resource of each base station 1 is virtually regarded as one baseband resource.

  According to each of the above-described embodiments, the base station 1 includes a plurality of baseband units 25 that can be set independently, and a plurality of wireless circuit units 32 that can be set independently. For this reason, it is possible to provide a plurality of services at the same place by a combination of these settings. In addition, the setting order of the baseband unit 25 and the radio circuit unit 32 can be switched according to a request from the terminal 9 that receives one of a plurality of services or a situation when the base station 1 operates with the EPC 5.

  Further, for example, the baseband signal processed by each baseband unit 25 can be transmitted to one or more cores such as the EPC 5 and the external network core 6 via the transmission line interface unit 22. At this time, the network core as the transmission destination can be independently switched for each baseband unit 25 in accordance with control via a network core such as the EPC 5 or a request from the terminal 9.

  Further, according to each of the above-described embodiments, for example, at least a part of the control / baseband unit 2 may be mounted in a PC on which the EPC 5 is mounted.

  Further, according to each of the above-described embodiments, as a connection path to the external network core 6 operated by an external company or the like, any of a path passing through the private LTE EPC5 and a path not passing through the EPC5 may be applied. Can be.

  Further, according to each of the above-described embodiments, the wireless unit 3 may be separated in advance for each frequency band. When the radio unit 3 is installed separately from the control / baseband unit 2 as RRH, the number of RRHs may be different depending on the frequency band, and a part of the plurality of frequency bands is separated as RRH. And others need not be separated. Further, the radio units 3 of each frequency band need not be synchronized.

  Further, according to each of the above-described embodiments, it is also possible to cooperate with another carrier (a cellular communication carrier or the like) of the external network 8. In this case, the server installed in the external network 8 stores user information and connection information of the private network and the carrier network of another carrier, and the base station 1 of the private network is appropriately controlled based on the information. Is also good.

  Further, according to each of the above-described embodiments, for example, in the base station 1 of the private LTE operable in a plurality of frequency bands including the millimeter wave band, the baseband resources can be shared among the plurality of frequency bands, It is possible to suppress an increase in the scale of the baseband circuit. In addition, frequency selection and baseband resource allocation according to applications and operating conditions can be efficiently realized, and the base station 1 can be simplified and reduced in cost.

  In addition to the above, a network core for performing data processing and the like can be selected for each frequency band, that is, for each application or user (terminal 9) in some cases. For this reason, in cases where confidentiality and low delay are required, a unique network core is used, and in cases where an external carrier network is accessed, an external carrier network core is used. A network configuration can be realized. This makes it possible to flexibly and efficiently cope with the introduction of applications that are becoming more sophisticated and diversified.

  The wireless communication systems 100 and 200 in each of the above-described embodiments are intended to improve customer convenience while, for example, a company or an organization operating an event site or a shopping mall holds various events for attracting customers. It may be used in a case where various applications are provided.

  For example, in an event venue as shown in FIG. 8, attractive contents are provided to event participants (a plurality of terminals 9-2), and a high-definition video linked to the contents is projected on a huge monitor (terminal 9-1) ( Distribution) may be hosted. In this case, low-latency and terminal capacity are required for communication relating to content, and high-speed and large-capacity are required for moving image distribution. As described above, since the respective required performances are different, it is desirable that each wireless communication be operated independently.

  In each of the above cases, the use of high-speed and low-delay millimeter-wave bands is assumed, but the content to participants uses Massive MIMO technology using beamforming, and the capacity and communication capacity by spatial multiplexing are used. Is effective. On the other hand, moving image distribution to a huge monitor does not need to be mobile communication, and large-capacity communication using a millimeter wave band as communication between fixed stations may be applied. However, since there is a concern that interference occurs at the same frequency, stability can be ensured by operating in different (plural) frequency bands.

  In addition, the event organizer can predict the number of participants and the traffic volume corresponding thereto to some extent in advance, and can also control the schedule of the event and the video distribution itself. For this reason, it is possible to allocate baseband resources according to the usage status. For example, in a time zone in which there are many participants and a lot of individual traffic, control can be performed such that the resolution of moving image distribution is reduced to reduce the occupancy of baseband resources. Further, a detailed scheduling can be performed, for example, by setting a schedule of high-definition moving image distribution in advance and controlling the progress of the event so as to restrict access to the event content during the time period.

  In the wireless communication system 200 according to the second embodiment described above, for example, as shown in FIG. 9, an event organizer installs a plurality of base stations 1 (base stations 1-1 and 1-2 in FIG. 9), It can be used for cooperative operation. In this case, more effective use of baseband resources can be realized.

  For example, in a scenario in which a participant accesses content while moving in an event venue, the base stations 1-1 and 1-2 of the private LTE have the same configuration, but optimally allocate baseband resources according to the movement of people. Can be done. In each of the base stations 1-1 and 1-2, the moving image distribution to the huge monitor is executed. However, during the time period in which participants gather in the event space A and the event proceeds (FIG. 9A), The base station 1-2 is in charge of video distribution to a huge monitor (terminal 9-3), and the base station 1-1 allocates many baseband resources to content distribution to participants (plural terminals 9-2). Can be distributed. After the participant is moved to the event space B (FIG. 9B), the base station 1-1 is in charge of distributing a moving image to the huge monitor (terminal 9-1), and the base station 1-2 is in charge of the distribution. Many baseband resources can be allocated to content distribution to participants (a plurality of terminals 9-4). If the same level of participants exists in any of the event spaces A and B, the baseband resources of the base stations 1-1 and 1-2 are regarded as collective baseband resources, and the video distribution and the content distribution are performed. By allocating efficiently to distribution, more sophisticated and complicated control can be realized.

  In addition to the above, the wireless communication systems 100 and 200 in each of the embodiments described above can be used, for example, in an emergency. For example, when a disaster or the like occurs at an event venue, it is necessary to ensure safety in cooperation with an external network. In this case, for example, a microwave band having a long transmission distance is used to guide a customer terminal 9 by indicating an evacuation route or to collect various sensor information installed in a building. , Etc., can be realized. In addition, an emergency service is implemented in an application for event participants, and in the event of a disaster, location information is collected in real time from the customer's terminal 9 and transmitted to an external partner organization for use in disaster rescue support activities. be able to. Also in this case, flexible usage such as allocating wireless and baseband resources intensively to communication to a severely damaged place becomes possible.

1: base station 2: control / baseband unit 21: network path switching control unit 22: transmission line interface unit 23: baseband resource allocation control unit 24: baseband unit 25: baseband unit 26: base station control unit 27 : Timing control unit 3: Wireless unit 31: Wireless circuit control unit 32: Wireless circuit unit 33: Antenna 4: Storage unit 5: EPC
6: External network core 7: Private network server 8: External network 9: Terminal 100: Wireless communication system 200: Wireless communication system S110: Network path switching control means S120: Acquisition means S130: Baseband resource allocation control means S140: Modulation / demodulation means S150: Radio circuit control means S160: Transmission means

Claims (6)

A wireless communication system that communicates with a plurality of terminals using a plurality of frequency bands,
Network path switching control means for setting a network path for each of the plurality of frequency bands,
Acquiring means for acquiring an IP packet corresponding to each of the plurality of frequency bands;
A plurality of baseband units, baseband resource allocation control means for allocating each of the plurality of frequency bands,
Modulation / demodulation means for converting each of the plurality of IP packets into a baseband signal using the baseband unit assigned to the frequency band corresponding to the IP packet;
Wireless circuit control means for independently setting parameters of a plurality of wireless circuit units based on the plurality of frequency bands,
A transmission unit that converts each of the plurality of baseband signals into an analog signal using the wireless circuit unit and transmits the analog signal to the terminal,
A wireless communication system comprising: For a base station having a plurality of baseband units and a plurality of radio circuit units, control conditions in at least one of the network path switching control unit, the baseband resource allocation control unit, and the radio circuit control unit The wireless communication system according to claim 1, further comprising a setting unit configured to generate a condition signal including: and setting the condition signal by the base station. The setting means,
A plurality of the base stations, connection information acquisition means for acquiring connection information indicating the communication status with the plurality of terminals,
Generating means for generating the condition signal for each of the plurality of base stations based on the plurality of connection information;
Condition signal transmitting means for transmitting the condition signal for each of the plurality of base stations via a network core,
The wireless communication system according to claim 2, comprising: The wireless communication system according to claim 2, wherein the condition signal includes an order in which the network path switching control unit, the baseband resource allocation control unit, and the wireless circuit control unit are executed. The network path switching control unit, the baseband resource allocation control unit, and the radio circuit control unit are configured such that another control unit is executed based on a control condition executed by any one of the control units. The wireless communication system according to any one of claims 1 to 4, wherein the remaining control means is executed based on the control condition executed by one of the control means. A base station that communicates with a plurality of terminals using a plurality of frequency bands,
A network path switching control unit that sets a network path for each of the plurality of frequency bands,
A transmission line interface unit for acquiring an IP packet corresponding to each of the plurality of frequency bands;
A plurality of baseband units, a baseband resource allocation control unit that allocates each of the plurality of frequency bands,
A baseband unit that has a plurality of the baseband units and converts each of the plurality of IP packets into a baseband signal using the baseband unit assigned to the frequency band corresponding to the IP packet; ,
A radio circuit control unit configured to independently set parameters of a plurality of radio circuit units based on the plurality of frequency bands,
Each of the plurality of baseband signals, a plurality of the radio circuit unit to convert to an analog signal and transmit to the terminal,
A base station comprising:

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