JP2019097120A - Communication system - Google Patents

Abstract

To provide a communication system capable of appropriately coping with a failure in a base station apparatus.SOLUTION: The communication system includes a base station apparatus for performing radio communication by a plurality of radio beams and a maintenance management apparatus for performing maintenance management of the base station apparatus. The base station apparatus transmits a normality confirmation beam for performing normality confirmation of beam formation (step St1201). The maintenance management apparatus receives the normality confirmation beam from the base station apparatus (step St1202). The maintenance management apparatus, when detecting abnormality of the normality confirmation beam from variation in a receiving state of the normality confirmation beam, notifies a host apparatus of the base station apparatus of possibility of a failure in the base station apparatus (steps St1204, St1205).SELECTED DRAWING: Figure 11

Description

  The present invention relates to communication systems.

  In the 3rd Generation Partnership Project (3GPP), a standardization body for mobile communication systems, the wireless section is referred to as Long Term Evolution (LTE), and the core network and the radio access network (hereinafter collectively referred to as networks) A communication system called System Architecture Evolution (SAE) has been considered for the entire system configuration including the term “U” (for example, non-patent documents 1 to 4). This communication scheme is also called 3.9G (3.9 Generation) system.

  As an access method of LTE, OFDM (Orthogonal Frequency Division Multiplexing) is used for downlink and SC-FDMA (Single Carrier Frequency Division Multiple Access) for uplink. Also, unlike W-CDMA (Wideband Code Division Multiple Access), LTE does not include circuit switching, and is only a packet communication method.

  The determination items regarding frame configuration in the LTE system in 3GPP described in Non-Patent Document 1 (Chapter 5) will be described using FIG. FIG. 1 is an explanatory view showing the configuration of a radio frame used in a communication system according to the LTE system. In FIG. 1, one radio frame (Radio frame) is 10 ms. The radio frame is divided into ten equally sized subframes. The subframe is divided into two equal sized slots. The downlink synchronization signal (Downlink Synchronization Signal) is included in the first and sixth subframes for each radio frame. The synchronization signal includes a first synchronization signal (Primary Synchronization Signal: P-SS) and a second synchronization signal (Secondary Synchronization Signal: S-SS).

  The decisions on channel configuration in the LTE system in 3GPP are described in Non-Patent Document 1 (Chapter 5). It is assumed that the same channel configuration as the non-CSG cell is also used in the CSG (Closed Subscriber Group) cell.

  Physical Broadcast Channel (PBCH) is a communication terminal apparatus such as a base station apparatus (hereinafter sometimes referred to simply as “base station”) to a mobile terminal apparatus (hereinafter sometimes simply referred to as “mobile terminal”) It is a channel for downlink transmission (hereinafter may be referred to simply as “communication terminal”). The BCH transport block (transport block) is mapped to four subframes in a 40 ms interval. There is no explicit signaling of 40 ms timing.

  A Physical Control Format Indicator Channel (PCFICH) is a channel for downlink transmission from a base station to a communication terminal. The PCFICH notifies the number of orthogonal frequency division multiplexing (OFDM) symbols used for PDCCHs from the base station to the communication terminal. The PCFICH is transmitted every subframe.

  A physical downlink control channel (PDCCH) is a channel for downlink transmission from a base station to a communication terminal. The PDCCH is resource allocation (allocation) information of a downlink shared channel (DL-SCH), which is one of the transport channels described later, and a paging channel (PCH, which is one of the transport channels described later) Resource allocation (allocation) information, and HARQ (Hybrid Automatic Repeat reQuest) information on DL-SCH. The PDCCH carries an uplink scheduling grant (Uplink Scheduling Grant). The PDCCH carries Ack (Acknowledgement) / Nack (Negative Acknowledgment), which is a response signal to uplink transmission. The PDCCH is also referred to as an L1 / L2 control signal.

  A physical downlink shared channel (PDSCH) is a channel for downlink transmission from a base station to a communication terminal. On the PDSCH, a downlink shared channel (DL-SCH), which is a transport channel, and a PCH, which is a transport channel, are mapped.

  A physical multicast channel (PMCH) is a channel for downlink transmission from a base station to a communication terminal. On the PMCH, a multicast channel (Multicast Channel: MCH), which is a transport channel, is mapped.

  A physical uplink control channel (PUCCH) is a channel for uplink transmission from a communication terminal to a base station. The PUCCH carries Ack / Nack, which is a response signal for downlink transmission. The PUCCH carries a CQI (Channel Quality Indicator) report. The CQI is quality information indicating the quality of received data or the channel quality. Moreover, PUCCH carries a scheduling request (Scheduling Request: SR).

  A physical uplink shared channel (PUSCH) is a channel for uplink transmission from a communication terminal to a base station. Uplink Shared Channel (UL-SCH), which is one of the transport channels, is mapped to PUSCH.

  A physical HARQ indicator channel (Physical Hybrid ARQ Indicator Channel: PHICH) is a channel for downlink transmission from a base station to a communication terminal. PHICH carries Ack / Nack which is a response signal to uplink transmission. A physical random access channel (PRACH) is a channel for uplink transmission from a communication terminal to a base station. The PRACH carries a random access preamble.

  The downlink reference signal (Reference Signal (RS)) is a known symbol as a communication system according to LTE. The following five downlink reference signals are defined. Cell-specific Reference Signal (CRS), MBSFN Reference Signal (MBSFN Reference Signal), Mobile-terminal-specific Reference Signal (UE-specific Reference Signal) Demodulation Reference Signal (DM-RS) Positioning reference signal (PRS), channel state information reference signal (CSI-RS). As measurement of the physical layer of the communication terminal, there is measurement of Reference Signal Received Power (RSRP) of a reference signal.

  The transport channel (Transport channel) described in Non-Patent Document 1 (Chapter 5) will be described. Among the downlink transport channels, a broadcast channel (BCH) is broadcast over the entire coverage of the base station (cell). The BCH is mapped to a physical broadcast channel (PBCH).

  Retransmission control based on HARQ (Hybrid ARQ) is applied to the downlink shared channel (DL-SCH). The DL-SCH can broadcast to the entire coverage of a base station (cell). The DL-SCH supports dynamic or semi-static resource allocation. Semi-static resource allocation is also referred to as persistent scheduling. The DL-SCH supports discontinuous reception (DRX) of the communication terminal to reduce power consumption of the communication terminal. The DL-SCH is mapped to a physical downlink shared channel (PDSCH).

  A paging channel (Paging Channel: PCH) supports DRX of the communication terminal to enable low power consumption of the communication terminal. The PCH is required to broadcast to the entire coverage of the base station (cell). The PCH is dynamically mapped to physical resources such as a physical downlink shared channel (PDSCH) available for traffic.

  A multicast channel (Multicast Channel: MCH) is used to broadcast to the entire coverage of a base station (cell). MCH supports SFN combining of Multimedia Broadcast Multicast Service (MBMS) services (MTCH and MCCH) in multi-cell transmission. MCH supports quasi-static resource allocation. MCH is mapped to PMCH.

  Among the uplink transport channels, retransmission control by HARQ (Hybrid ARQ) is applied to the uplink shared channel (UL-SCH). The UL-SCH supports dynamic or semi-static (Semi-static) resource allocation. The UL-SCH is mapped to a physical uplink shared channel (PUSCH).

  The Random Access Channel (RACH) is limited to control information. The RACH is at risk of collisions. The RACH is mapped to a physical random access channel (PRACH).

  The HARQ will be described. HARQ is a technology for improving the communication quality of a transmission path by a combination of Automatic Repeat Request (ARQ) and Forward Error Correction. HARQ also has the advantage that error correction functions effectively by retransmission even for transmission paths where the communication quality changes. In particular, by combining the reception result of the initial transmission and the reception result of the retransmission at the time of retransmission, it is possible to obtain further quality improvement.

  An example of a retransmission method will be described. On the receiving side, if the received data can not be decoded correctly, in other words, if a CRC (Cyclic Redundancy Check) error occurs (CRC = NG), “Nack” is transmitted from the receiving side to the transmitting side. The transmitter that has received "Nack" retransmits the data. If the reception data is correctly decoded on the reception side, in other words, if no CRC error occurs (CRC = OK), the reception side transmits “Ack” to the transmission side. The transmitter that has received "Ack" transmits the following data.

  A logical channel (Logical channel) described in Non-Patent Document 1 (Chapter 6) will be described. A broadcast control channel (BCCH) is a downlink channel for broadcast system control information. The BCCH, which is a logical channel, is mapped to a broadcast channel (BCH), which is a transport channel, or a downlink shared channel (DL-SCH).

  The Paging Control Channel (PCCH) is a downlink channel for transmitting changes in paging information (Paging Information) and system information (System Information). The PCCH is used when the network does not know the cell location of the communication terminal. The PCCH, which is a logical channel, is mapped to a paging channel (PCH), which is a transport channel.

  The common control channel (CCCH) is a channel for transmission control information between the communication terminal and the base station. The CCCH is used when the communication terminal does not have an RRC connection (connection) with the network. In the downlink direction, the CCCH is mapped to a downlink shared channel (DL-SCH), which is a transport channel. In the uplink, the CCCH is mapped to an uplink shared channel (UL-SCH), which is a transport channel.

  A Multicast Control Channel (MCCH) is a downlink channel for one-to-many transmission. The MCCH is used for transmission of MBMS control information for one or several MTCHs from the network to the communication terminal. The MCCH is used only for communication terminals that are receiving MBMS. The MCCH is mapped to a transport channel, a multicast channel (MCH).

  The Dedicated Control Channel (DCCH) is a channel that transmits dedicated control information between the communication terminal and the network on a one-to-one basis. The DCCH is used when the communication terminal is an RRC connection (connection). The DCCH is mapped to the uplink shared channel (UL-SCH) in uplink and mapped to the downlink shared channel (DL-SCH) in downlink.

  Dedicated Traffic Channel (DTCH) is a channel of one-to-one communication to a dedicated communication terminal for transmission of user information. The DTCH is present both upstream and downstream. The DTCH is mapped to the uplink shared channel (UL-SCH) in uplink and mapped to the downlink shared channel (DL-SCH) in downlink.

  A Multicast Traffic Channel (MTCH) is a downlink channel for traffic data transmission from the network to the communication terminal. MTCH is a channel used only for communication terminals that are receiving MBMS. The MTCH is mapped to a multicast channel (MCH).

  CGI is a cell global identifier. The ECGI is an E-UTRAN Cell Global Identifier. A Closed Subscriber Group (CSG) cell is introduced in LTE, Long Term Evolution Advanced (LTE) described later, and Universal Mobile Telecommunication System (UMTS).

  A CSG (Closed Subscriber Group) cell is a cell in which an operator specifies an available subscriber (hereinafter sometimes referred to as a "specific subscriber cell"). The identified subscriber is authorized to access one or more cells of Public Land Mobile Network (PLMN). One or more cells to which the identified subscriber is permitted to access are referred to as "CSG cells (CSG cells (s))". However, PLMN has access restrictions.

  The CSG cell is part of a PLMN that broadcasts a unique CSG identity (CSG identity: CSG ID) and broadcasts “TRUE” in CSG Indication (CSG Indication). The members of the subscriber group who has been registered for use in advance and who has been authorized access the CSG cell using the CSG ID which is access permission information.

  The CSG ID is broadcasted by the CSG cell or cell. A plurality of CSG IDs exist in the communication system of the LTE scheme. And, the CSG ID is used by the mobile terminal (UE) to facilitate access of CSG related members.

  The position tracking of the communication terminal is performed in units of areas consisting of one or more cells. The position tracking is performed to track the position of the communication terminal even in the standby state and to call the communication terminal, in other words, to enable the communication terminal to receive a call. The area for tracking the position of this communication terminal is called a tracking area.

  In 3GPP, base stations called Home-NodeB (Home-NB; HNB) and Home-eNodeB (Home-eNB; HeNB) are being considered. The HNB in UTRAN and the HeNB in E-UTRAN are, for example, base stations for home, corporate and commercial access services. Non-Patent Document 2 discloses three different modes of access to HeNB and HNB. Specifically, an open access mode, a closed access mode, and a hybrid access mode are disclosed.

  Further, in 3GPP, as Release 10, the standard formulation of Long Term Evolution Advanced (LTE-A) is in progress (see Non-Patent Document 3 and Non-Patent Document 4). LTE-A is based on the LTE wireless zone communication scheme, and is configured by adding some new technologies thereto.

  In the LTE-A system, two or more component carriers (CCs) are aggregated (also referred to as "aggregation") to support wider frequency bandwidths up to 100 MHz. Carrier aggregation (CA) has been considered. The CA is described in Non-Patent Document 1.

  When the CA is configured, the mobile terminal has a network (Network: NW) and only one RRC connection (RRC connection). In RRC connection, one serving cell provides NAS mobility information and security input. This cell is called a primary cell (Primary Cell: PCell). On the downlink, a carrier corresponding to PCell is a Downlink Primary Component Carrier (DL PCC). In uplink, the carrier corresponding to PCell is an uplink primary component carrier (UL PCC).

  Depending on the capabilities of the mobile terminal, a Secondary Cell (SCell) is configured to form a set of serving cells with the PCell. In downlink, the carrier corresponding to SCell is a Downlink Secondary Component Carrier (DL SCC). In uplink, the carrier corresponding to SCell is an uplink secondary component carrier (UL SCC).

  A set of serving cells consisting of one PCell and one or more SCells is configured for one mobile terminal.

  Further, as new technologies in LTE-A, there are a technology (Wider bandwidth extension) that supports a wider band and a technology such as Coordinated Multiple Point Transmission and Reception (CoMP) technology. The CoMP considered for LTE-A in 3GPP is described in Non-Patent Document 1.

  Mobile network traffic volume is on the rise and communication speeds are also increasing. When LTE and LTE-A are put into full operation, it is expected that the communication speed will be further increased.

  Moreover, in 3GPP, in order to cope with the huge traffic in the future, using small eNB (Hereinafter, it may be called a "small-scale base station apparatus") which comprises a small cell is examined. For example, a technology etc. which aim at increase of communication capacity by raising frequency utilization efficiency by installing many small eNBs and configuring many small cells are considered. Specifically, there is dual connectivity (Dual Connectivity; abbreviated as DC) in which a terminal (User Equipment: UE) connects and communicates with two eNBs. Non-Patent Document 1 describes DC.

  The DC configuration described in Non-Patent Document 1 (Chapter 4) will be described with reference to FIG. FIG. 2 is a system configuration diagram showing a configuration at the time of DC. One of the eNBs performing DC may be referred to as a "master eNB (abbreviation: MeNB)", and the other may be referred to as a "secondary eNB (abbreviation: SeNB)". The C-plane is communicated on the S1-MME interface between the MME and the MeNB, and communicated on the X2-C interface between the MeNB and the SeNB. The U-plane is communicated on the S1-U interface between the S-GW and the MeNB and between the SeNB, and communicated on the X2-U interface between the MeNB and the SeNB. For communication between eNB and UE, C-plane is communicated between MeNB and UE, and U-plane is communicated between MeNB and UE and between SeNB and UE.

  Furthermore, for advanced mobile communication, a fifth generation (hereinafter sometimes referred to as “5G”) radio access system is being considered with the goal of starting service after 2020. Also in 3GPP, the 5G architecture is summarized as New Generation Radio Access Network (NG-RAN) (see Non-Patent Document 5). In the 5G wireless access system, an LTE base station may be referred to as an eNB, and a 5G base station may be referred to as a gNB. A function for processing a C-plane of a 5G core network is referred to as an AMF (Access and mobility Management Function). The function of processing a plane may be called UPF (User Plane Function).

  The 5G wireless access system has a system capacity of 1000 times, a data transmission rate of 100 times, a data processing delay of 1/10 (1/10), and a simultaneous connection number of communication terminals of 100 times that of an LTE system It is mentioned as a requirement to realize further reduction of power consumption and cost reduction of the apparatus.

  In order to satisfy such a demand, it is considered to use a frequency in a wide band to increase the data transmission capacity. In order to secure a wide band radio frequency band, studies are also underway to use a high frequency band of millimeter waves. In Non-Patent Document 6, it is assumed to use radio frequencies of 30 GHz and 70 GHz in use cases such as Indoor hotspot, Dense urban, and High speed.

  In addition, it is also considered to increase the data transmission rate by increasing the frequency utilization efficiency. In order to realize these, techniques such as MIMO (Multiple Input Multiple Output) and beamforming using a multi-element antenna are considered, which enable spatial multiplexing.

  Also in LTE-A, the study of MIMO is continued, and FD (Full Dimension) -MIMO using a two-dimensional antenna array is considered from Release 13 as an extension of MIMO. The FD-MIMO is described in Non-Patent Document 7.

  It is considered that the 5G wireless access system will be co-located with the LTE system at the beginning of the service scheduled from 2020. By connecting the LTE base station and the 5G base station in a DC configuration, setting the LTE base station as the MeNB, and setting the 5G base station as the secondary gNB (abbreviation: SgNB), C-plane data in the LTE base station having a large cell range Is considered, and a configuration in which the LTE base station and the 5G base station perform U-plane processing is considered (see Non-Patent Document 8).

  In the NG-RAN, a C-plane is communicated on the NG-C interface between the AMF and the MeNB, and communicated on the Xn-C interface between the MeNB and the SgNB. A U-plane is communicated on the NG-U interface between UPF and MeNB and between UPF and SgNB, and communicated on the Xn-U interface between MeNB and SgNB.

  As shown in FIG. 3, SgNB is a 5G base station, and communication is performed using a beam selected by UE from among beams transmitted by gNB. In FIG. 3, the UE selects and communicates with beam # 2 from beams # 1 to # 3 transmitted by the gNB.

3GPP TS 36.300 V14.3.0 3GPP S1-083461 3GPP TR 36.814 V9.0.0 3GPP TR 36.912 V10.0.0 3GPP TR 38.300 V0.4.1 3GPP TR 38.913 V14.2.0 3GPP TS 36. 897 V13.0.0 3GPP TR 38.801 V14.0.0 3GPP TR32.541 V14.0.0

  In the conventional mobile communication system, there is a method in which the base station detects its own abnormality and reports it to the higher rank apparatus as a method of confirming whether the base station is operating normally (5.4 of Non-Patent Document 9). .1 see chapter 1). Also, as shown in FIG. 4, a method is considered in which the higher-level equipment detects a decrease in the frequency of call connection from a mobile terminal present in the area within the area of the base station (5.4.2 in Non-Patent Document 9). See chapter).

  On the other hand, in the DC configuration of the NG-RAN including the 5G base station (gNB), the C-plane communication is performed with the base station (MeNB), so even if the decrease in the frequency of call connection is detected. There is a problem that the failure of the base station (SgNB) can not be detected. Also, since the base station (gNB) forms a beam to communicate with the mobile terminal (UE), the transmission output of the beam drops and U-plane communication with the mobile terminal is not possible (Fig. When communication can not be performed between SgNB # 1 and UE # 1 as shown in 5), there is a problem that a failure of gNB can not be detected. In addition, when the beam of SgNB is in an abnormal formation state and communication can not be performed in the direction different from the direction of UE (as shown in FIG. 5, communication between SgNB # 2 and UE # 2 can not be performed. Also, there is a problem that the failure of gNB can not be detected.

  Further, maintenance of the installed base station has been carried out by detecting a failure of the base station apparatus using the above-described means or the like, and replacing the failed base station apparatus as necessary. Such maintenance forms have maintained the services of mobile communication systems. Since a high frequency band is used for radio signals in the 5G system, it is expected that the number of base stations to be installed will be significantly increased compared to the prior art. Moreover, when APAA (Active Phased Array Antenna) using a super multi-element antenna is applied to a 5G base station, the case where only a part of elements fail is fully considered. Even in the case where only some of the elements fail, if the same maintenance as in the past is performed, there is a problem that the operation cost (CAPEX) and the equipment cost (OPEX) increase significantly as compared with the past.

  The present invention has been made to solve the problems as described above, and it is an object of the present invention to provide a communication system capable of appropriately coping with a failure of a base station apparatus.

  According to the present invention, there is provided a base station apparatus performing wireless communication with a plurality of wireless beams, and a maintenance management apparatus performing maintenance management of the base station apparatus, the base station apparatus for confirming normality of beam formation. Transmits the normality confirmation beam, the maintenance management device receives the normality confirmation beam of the base station apparatus, and detects an abnormality of the normality confirmation beam from the fluctuation of the reception state of the normality confirmation beam In this case, a communication system is provided to notify a higher-order apparatus of the base station apparatus that the base station apparatus has a possibility of failure.

  Further, according to the present invention, the multi-element antenna is provided with a communication terminal apparatus and a base station apparatus configured to be able to wirelessly communicate with the communication terminal apparatus using a multi-element antenna constituted by a plurality of antenna elements. When a part of the antenna elements of the antenna fails, the base station apparatus calculates the radiation power value of the multi-element antenna according to the number of the failed antenna elements, and the calculated radiation power value is reported to the base station apparatus A communication system is provided that broadcasts in information.

  Further, according to the present invention, the multi-element antenna is provided with a communication terminal apparatus and a base station apparatus configured to be able to wirelessly communicate with the communication terminal apparatus using a multi-element antenna constituted by a plurality of antenna elements. A communication system is provided in which, when a part of the antenna elements of the above fails, the base station apparatus corrects the control parameters of the non-failed antenna elements with a correction parameter according to the failed antenna element.

  According to the present invention, it is possible to provide a communication system capable of appropriately coping with a failure of a base station apparatus.

  The objects, features, aspects and advantages of the present invention will become more apparent from the following detailed description and the accompanying drawings.

It is explanatory drawing which shows the structure of the radio | wireless frame used by the communication system of a LTE system. It is a system configuration figure showing composition of dual connectivity. It is a system configuration figure showing the composition of dual connectivity of 5G system. It is a figure which shows the structure of failure detection of eNB in the communication system of a LTE system. It is a figure which shows the subject of failure detection of gNB in the communication system containing a 5G base station. FIG. 5 is a configuration diagram of a communication system in which the beam forming normality confirmation of the radio base station is performed by gNB according to the first embodiment. It is a functional block diagram of a base station (MeNB) about Embodiment 1. FIG. FIG. 7 is a diagram showing an example of a maintenance management table according to the first embodiment. FIG. 5 is a functional block diagram of a 5G base station (SgNB) according to the first embodiment. FIG. 7 is a sequence diagram for explaining an operation of performing beam normality confirmation between the 5G base stations (SgNB) according to the first embodiment. FIG. 7 is a sequence diagram for explaining an operation of performing beam normality confirmation between the 5G base stations (SgNB) according to the first embodiment. FIG. 7 is a sequence diagram for explaining an operation of performing beam normality confirmation between the 5G base stations (SgNB) according to the first embodiment. It is a block diagram of the communication system which performs normality confirmation of the beam formation of a wireless base station by HeNB and 5G mobile terminal (5G UE) about the modification 1 of Embodiment 1. FIG. It is a functional block diagram of a base station (HeNB) about the modification 1 of Embodiment 1. FIG. FIG. 21 is a sequence diagram for explaining the operation of checking the normality of the beam of the 5G base station (SgNB) using the HeNB and the 5G mobile terminal (5G UE) for the first modification of the first embodiment. FIG. 7 is a functional block diagram of a 5G base station according to a second embodiment. FIG. 13 is a flow chart for explaining the operation of the 5G base station in the case where a failure is detected in part of elements of APAA according to Embodiment 2. FIG. FIG. 21 is a functional block diagram of a 5G base station according to the first modification of the second embodiment. FIG. 17 is a sequence diagram for explaining the operation of the communication system in the case where a failure is detected in part of elements of APAA in the second modification of the second embodiment. FIG. 21 is a diagram for describing an operation of the communication system in the case where a failure is detected in part of elements of APAA in the second modification of the second embodiment.

Embodiment 1
In 5G, APAA forms a beam and directs the beam to the mobile terminal for communication. For this reason, it is possible to suppress the interference between the transmission waves of the base stations as compared with the related art, and it is also possible to densely install the base stations as compared with the related art. In the first embodiment, a failure detection technique that takes advantage of such features will be described. Specifically, it is effective to synchronize timings between 5G base stations, form beams in the direction of each other, and check whether the radio signals can be output normally.

  For example, the following method is applicable as a method of beam normality confirmation. Each SgNB periodically transmits a beam specific downlink reference signal (BRS: Beam specific Reference Signal) for each beam that it holds for beam normality confirmation. The adjacent SgNB receives the BRS. When the adjacent SgNB detects that it can not periodically receive the BRS (in other words, the beam containing the BRS), the beam normality is judged to be NG, that is, a beam abnormality.

  Hereinafter, a more specific example is given and demonstrated.

  FIG. 6 is a block diagram of a communication system for performing normality confirmation of beam forming of a wireless base station using gNB according to the first embodiment. In the example of FIG. 6, the communication system 100 includes the base station (MeNB) 120 connected to the core network (AMF / UPF) 110, the plurality of 5G base stations (SgNB) 130 connected to the MeNB 120, and the SgNB 130. And a mobile terminal (UE) 140 connected to the MeNB 120. The components of the communication system 100 and the number of the components are not limited to the example shown in FIG. The same applies to the examples described later.

  As shown in FIG. 7, the MeNB 120 includes a maintenance management table 121 and a beam maintenance management scheduling function unit 122. The maintenance management table 121 is a table for managing the SgNB 130 subordinate to the MeNB 120. The beam maintenance management scheduling function unit 122 manages the maintenance management table 121, and also determines the timing and period for performing beam normality confirmation of the SgNB 130.

  An example of the maintenance management table 121 is shown in FIG. In the example of FIG. 8, in the maintenance management table 121, an ID, information on radio resources, information on beams, BRS transmission timing, and BRS reception timing are recorded for each SgNB as information on SgNB. The BRS is transmitted and received for beam health check, as described above. The information recorded in the maintenance management table 121 is not limited to the example shown in FIG.

  As shown in FIG. 9, the SgNB 130 includes a beam maintenance function unit 132. The beam maintenance and management function unit 132 instructs the normal scheduling function unit 131 which schedules the timing of 5G communication, a beam normality confirmation operation according to the timing and the period of performing the beam normality confirmation. In addition, the SgNB 130 includes a maintenance management table 133 corresponding to the maintenance management table 121 (see FIG. 7) of the MeNB 120. Here, the recording information of the maintenance management table 133 of the SgNB 130 is the same as the recording information of the maintenance management table 121 of the MeNB 120, but the recording information of the tables 121 and 133 may be different.

  FIGS. 10 to 12 show sequence diagrams for explaining the operation of performing beam normality confirmation between the 5G base stations (SgNBs) 130 in the communication system 100 described above. 10 to 12 are connected at the positions of boundary lines BL1011 and BL1112.

  In step St1101, the core network 110 notifies the MeNB 120 of a cycle (maintenance management cycle) of performing beam normality check of the SgNB 130 subordinate to the MeNB 120 in advance. Step St1101 is performed when the core network 110 establishes an S1 link with the MeNB 120. Alternatively, step St1101 may be performed by adding information on a maintenance management cycle to the message when the core network 110 transmits a message such as MME configuration update.

  In step St1102, the MeNB 120 registers information on the maintenance management cycle notified from the core network 110 in the maintenance management table 121.

  When the MeNB 120 is requested to establish a connection from the subordinate SgNB 130 by the Xn Setup Request (Step St1103), the MeNB 120 adds the information of the SgNB 130 to the maintenance management table 121 in Step St1104. The information of the SgNB 130 is, for example, an ID, information on a radio resource, and information on a beam of the SgNB (see FIG. 8).

  After that, in step St1105, the MeNB 120 transmits a BRS for beam normality confirmation to which SgNB 130 at any timing based on the information of the SgNB and the information of the maintenance management cycle already registered in the maintenance management table 121. Or schedule to receive. Then, based on the scheduling result, the MeNB 120 notifies the subordinate SgNB 130 of the transmission timing and period of the BRS for beam normality confirmation (see steps St1106 and St1107 in FIG. 10). As illustrated in FIG. 10, the notification from the MeNB 120 to the SgNB 130 can be performed, for example, using a message of Xn Setup Response or a message of eNB Configuration Update. Other messages may be used.

  The SgNB 130 stores, in the maintenance management table 133, the information on the timing, period, and resources of beam normality confirmation notified from the MeNB 120. In addition, the SgNB 130 sets a timer so that the beam maintenance and management function unit 132 operates at the timing and cycle of beam normality confirmation. Thereby, when the beam normality confirmation timing comes and the beam maintenance management function unit 132 is activated by the timer, the beam normality confirmation operation St 1200 (see FIGS. 11 and 12) is executed.

  In the beam normality confirmation operation St1200 shown in FIG. 11, the SgNB # 1 transmits a BRS for beam normality confirmation, and the BRS is received by the SgNB # 2. More specifically, in SgNB # 1, when started by the timer, the beam maintenance and management function unit 132 instructs the scheduling function unit 131 to transmit the BRS (step St1201). On the other hand, in SgNB # 2, when started by the timer, the beam maintenance management function unit 132 instructs the scheduling function unit 131 to receive the BRS (step St1202).

  In step St1203, the SgNB # 2 records the ID, power, and the like of the received beam. Then, in step St 1204, SgNB # 2 compares the current recording with the previous recording, and when detecting a change related to the reception beam, notifies the MeNB 120 of change detection in step St 1205. For example, if the beam could not be received at the time of beam normality check in the past, or if the received power of the beam decreases, SgNB # 2 notifies the MeNB 120 to that effect. Moreover, it is preferable to perform notification to MeNB 120, when it becomes impossible to receive a beam two or more times continuously, or when the reduction rate of the reception power of a beam exceeds a threshold value. That is, it is preferable to apply hysteresis or a criterion to determine whether or not to notify the MeNB 120.

  When the MeNB 120 receives the notification of the change in the beam normality confirmation from the subordinate SgNB 130 (here, SgNB # 2) in Step St1205, the MeNB 120 determines the presence or absence of a beam failure in Step St1206. For example, the MeNB 120 confirms the establishment state (for example, Xn Interfase Released and the like) of the Xn Interface with the SgNB 130 (here, SgNB # 1) that may have a beam failure. Then, in the case where the beam normality can not be confirmed although the SgNB # 1 is in the operation state, the MeNB 120 determines that there is a possibility of a failure, and sends the core network 110 to the core network 110 in step St1207. To notify the abnormality of SgNB # 1.

  As shown in FIG. 12, when the next beam normality confirmation timing comes and the beam normality confirmation operation St1200 is started, SgNB # 2 performs BRS for beam normality confirmation, contrary to the case of FIG. It transmits (step St1201), and SgNB # 1 receives this BRS (step St1202). That is, the SgNB # 1 receiving the BRS executes steps St1203 to St1205.

  In the above, the example which provides the beam maintenance management scheduling function part 122 which determines the timing and period for beam normality confirmation in MeNB120 was demonstrated. However, it is not limited to this example. For example, the core network may perform scheduling for beam health verification. In addition, SgNB is autonomously adjacent based on the information (Neighbor Information) of the adjacent cell included in the message of Xn Setup Request or the like, and the information of the Neighbor Relation Table updated by the Automatic Neighbor Relation (ANR) function. You may perform beam normality confirmation of SgNB.

  Moreover, in the above, the example in which DC is configured by the MeNB 120 and the SgNB 130 has been described. However, it is not limited to this example. For example, beam normality confirmation of adjacent gNBs may be performed autonomously in a standalone gNB. Also, the core network may instruct the adjacent SgNB to change the beam forming direction so as to cover the area of the SgNB in which the abnormality has been detected, when receiving the abnormality notification of the SgNB.

  As described above, according to the first embodiment, by providing the apparatus configuring the 5G communication system with the beam normality confirmation function between adjacent SgNBs, the beam abnormality of the SgNB can be made more accurate than that of the prior art. It becomes possible to detect well.

  According to the first embodiment, for example, the following configuration is provided.

  There is provided a communication system including a base station apparatus performing wireless communication with a plurality of wireless beams, and a maintenance management apparatus performing maintenance management of the base station apparatus. More specifically, the base station apparatus transmits a normality confirmation beam for beamforming normality confirmation. The maintenance management device receives the normality confirmation beam of the base station device. In addition, when the maintenance management device detects an abnormality of the normality confirmation beam from the fluctuation of the reception state of the normality confirmation beam of the base station device, the base station device indicates that the base station device may be broken. Notify the higher-level device of

  Here, in the above-described example, the case has been described in which the maintenance management apparatus is configured by another base station apparatus located at a position where it can communicate with the base station apparatus.

  Further, in the above-described example, another base station apparatus is also configured to be able to transmit the normality confirmation beam, and the case has been described where the base station apparatus receives the normality confirmation beam of the other base station apparatus. More specifically, when the base station apparatus detects an abnormality in the normality confirmation beam of the other base station apparatus from the fluctuation of the reception state of the normality confirmation beam of the other base station apparatus, the other base station The higher-level equipment of the other base station equipment is notified that there is a possibility of failure in the station equipment. The higher-level device of another base station device may be the same as or different from the higher-level device of the base station device.

  The above-described configuration can be variously modified based on the disclosure and suggestion of the present specification including the first embodiment. According to the above-mentioned composition and its modification composition, the above-mentioned subject is solved and the above-mentioned effect can be acquired.

Modification 1 of Embodiment 1
When adjacent SgNBs are not installed within the reach of each other's beam, HeNB and 5G mobile terminals (hereinafter referred to as 5G UEs) installed within the reach of the SgNB's beams are normality confirmation of SgNB beams In some cases, the configuration is effective.

  For example, the following method is applicable as a method of beam normality confirmation. The gNB periodically transmits a beam specific downlink reference signal (BRS: Beam specific Reference Signal) for beam normality verification for each beam it holds. The BRS is received by the 5G UE connected to the HeNB. When the 5G UE detects that it can not periodically receive the BRS (in other words, the beam containing the BRS), the beam normality is judged to be NG, that is, a beam abnormality.

  Hereinafter, a more specific example is given and demonstrated.

  FIG. 13 is a configuration diagram of a communication system in which HeNB and 5G UE perform normality confirmation of beam forming of a radio base station according to the first modification of the first embodiment. In the example of FIG. 13, the communication system 200 connects the base station (MeNB) 220 connected to the core network (AMF / UPF) 210, the 5G base station (SgNB) 230 connected to the MeNB 220, and the core network 210 And the 5G UE 250 connected to the HeNB 240 (hereinafter sometimes referred to simply as the UE 250).

  MeNB220 and SgNB230 are the same as that of the base station used by a normal communication system. The HeNB 240 and the UE 250 connected to the HeNB 240 relate to the first modification of the first embodiment. Therefore, in the following, configurations and operations different from the normal system configuration are mainly described.

  A configuration in which the UE 250 is connected via a wired or wireless interface to the HeNB 240 installed within the reach of the SgNB beam that you want to perform beam normality confirmation, and a dedicated interface connection is provided between the HeNB 240 and the UE 250 I assume.

  As shown in FIG. 14, the HeNB 240 includes a maintenance management table 241 and a beam maintenance management function unit 242. The maintenance management table 241 is a table for managing the maintenance management period of the beam of the SgNB 230 notified from the core network 210 and the information of the beam of the SgNB 230 received via the connected UE 250. The beam maintenance management function unit 242 manages the maintenance management table 241. Further, the beam maintenance management function unit 242 performs the beam normality confirmation of the SgNB 230 using the UE 250.

  FIG. 15 is a sequence diagram for explaining the operation of checking the normality of the beam of the SgNB 230 using the HeNB 240 and the UE 250 in the communication system 200 described above.

  In step St2101, the core network 110 notifies the HeNB 240 of a cycle (maintenance management cycle) in which beam normality check of SgNB (here, SgNB 130) present in the area where the HeNB 240 is installed is performed. Step St2101 is performed when the core network 210 establishes an S1 link with the HeNB 240. Alternatively, step St2101 may be performed by adding information on a maintenance management cycle to the message when the core network 210 transmits a message such as MME configuration update.

  In step St2102, the HeNB 240 registers, in the maintenance management table 241, the information on the maintenance management cycle notified from the core network 210.

  Then, the HeNB 240 sets a timer so that the beam maintenance and management function unit 242 operates in the cycle of beam normality confirmation notified from the core network 210. Thus, when the beam maintenance and management function unit 242 is activated by the timer, the beam normality confirmation operation St2200 is executed.

  In beam normality confirmation operation St2200, when the beam maintenance and management function unit 242 is started by the timer, the beam maintenance and management function unit 242 transmits the BRS of the SgNB 230 to the connected UE 250 using a dedicated interface. It instructs to receive (step St2201).

  The UE 250 connected to the HeNB 240 receives the BRS reception instruction from the HeNB 240, and receives the BRS according to the BRS reception procedure of the normal 5G system (Step St2202). When the reception of the BRS is completed, the UE 250 notifies the HeNB 240 of the BRS reception result (Step St2203).

  The HeNB 240 records the BRS reception result (beam ID, power, etc.) notified from the UE 250 in the maintenance management table 241 in step St 2204. Then, in step St2205, the HeNB 240 compares the present recording with the past recording, and when detecting a change related to the reception beam, notifies the core network 210 of change detection in step St206. For example, when the beam which has been received at the time of beam normality confirmation in the past can not be received, or when the received power of the beam decreases, the HeNB 240 notifies the core network 210 to that effect. Further, it is preferable to notify the core network 210 when the beam can not be received a plurality of times consecutively, or when the reduction rate of the received power of the beam exceeds a threshold. That is, it is preferable to apply hysteresis or a criterion to determine whether or not to notify the core network 210.

  In the above, the example which provides the beam maintenance management function part 242 for beam normality confirmation in HeNB240 was demonstrated. However, it is not limited to this example. For example, the UE 250 connected to the HeNB 240 may be provided with the same function as the beam maintenance and management function unit 242. In this case, in addition to the above-mentioned BRS reception, the UE 250 holds the past BRS reception result and performs fluctuation detection.

  Also, the HeNB may be used as a connection path between the 5G UE for beam normality confirmation and the core network without providing the HeNB with a function related to beam normality confirmation. In this case, the above-mentioned function for beam normality confirmation is provided in 5G UE.

  As described above, according to the first modification of the first embodiment, by providing the apparatus configuring the 5G communication system with the beam normality confirmation function between adjacent SgNBs, the beam abnormality of the SgNB can be reduced by the conventional method. It becomes possible to detect with high accuracy compared with.

  According to the first modification of the first embodiment, for example, the following configuration is provided.

  There is provided a communication system including a base station apparatus performing wireless communication with a plurality of wireless beams, and a maintenance management apparatus performing maintenance management of the base station apparatus. More specifically, the base station apparatus transmits a normality confirmation beam for beamforming normality confirmation. The maintenance management device receives the normality confirmation beam of the base station device. In addition, when the maintenance management device detects an abnormality of the normality confirmation beam from the fluctuation of the reception state of the normality confirmation beam of the base station device, the base station device indicates that the base station device may be broken. Notify the higher-level device of

  Here, in the above-described example, the case has been described in which the maintenance management device is configured by the communication terminal device existing at a position where communication with the base station device is possible and the other base station device to which the communication terminal device is connected. . More specifically, the communication terminal apparatus receives the normality confirmation beam of the base station apparatus, and the communication terminal apparatus or another base station apparatus performs abnormality detection of the normality confirmation beam of the base station apparatus, and the other The base station apparatus notifies a higher-order apparatus at the time of abnormality detection.

  The above-described configuration can be variously modified based on the disclosure and suggestion of the present specification including the first modification of the first embodiment. According to the above-mentioned composition and its modification composition, the above-mentioned subject is solved and the above-mentioned effect can be acquired.

Second Embodiment
When a part of the elements constituting an Active Phased Array Antenna (APAA) fails, a state in which part of the elements is broken without assuming device replacement from the viewpoint of the operation cost (CAPEX) and the equipment cost (OPEX) It is effective to continue the operation of the system as it is.

  FIG. 16 is a block diagram of the 5G base station 300 according to the second embodiment. As shown in FIG. 16, the 5G base station 300 includes an element failure detection function unit 301, a radiation power calculation unit 302, and a signal processing unit 303. The element failure detection function unit 301 detects a failure of each element of APAA. The radiation power calculation unit 302 calculates the value of the radiation transmission power of APAA according to the number of the failed elements. The signal processing unit 303 processes a signal of broadcast information of the 5G base station 300. The 5G base station 300 constitutes a communication system together with a normal 5G UE or the like.

  FIG. 17 is a flowchart illustrating the operation of the 5G base station 300 when a failure is detected in the element of APAA. According to the example of FIG. 17, when the element failure detection function unit 301 included in APAA detects a failure of an element in step St3001, the element failure detection function unit 301 radiates the information of the failed element in step St3002. The calculation unit 302 is notified. In step St3003, the radiation power calculation unit 302 calculates the value of radiation power according to the number of failed elements (in other words, according to the number of non-failed elements). In step St3004, the radiation power calculation unit 302 notifies the signal processing unit 303 of the 5G base station 300 to which APAA is connected, of the calculated radiation power value. In step St3005, the signal processing unit 303 reflects the radiation power value acquired from the radiation power calculation unit 302 in the broadcast information of the 5G base station 300. That is, the radiation power value calculated by the radiation power calculation unit 302 is included in the notification information and notified.

  Thus, the UE uses the 5G base station 300 based on the radiation power value included in the received broadcast information. Alternatively, the UE may determine to use another base station other than the 5G base station 300 based on the received radiation power value (for example, even if it determines to handover to another base station) Good).

  The failure detection of an element may be performed for each element, or may be performed for each block by dividing it into blocks made up of a plurality of elements. In addition, when the number of faulty elements for which continuation of the operation is determined to be impossible is retained as an operation parameter, and the number of detected faulty elements exceeds the operation parameter (that is, the operation parameter is used as a threshold), The procedure may be to notify the core network side as a failure of the device.

  As described above, according to the second embodiment, according to the number of elements in which a failure is detected in APAA, by reflecting the radiation power value in the case where some elements fail, in the notification information, the APAA It becomes possible to constitute a communication system which continues operation even in the state where part of the element has failed.

  According to the second embodiment, for example, the following configuration is provided.

  There is provided a communication apparatus including a communication terminal apparatus and a base station apparatus configured to be capable of wireless communication with the communication terminal apparatus using a multi-element antenna configured of a plurality of antenna elements. More specifically, when part of the antenna elements of the multi-element antenna fails, the base station apparatus calculates the radiation power value of the multi-element antenna according to the number of failed antenna elements, and the calculated radiation power value In the broadcast information of the base station apparatus.

  The above-described configuration can be variously modified based on the disclosure and suggestion of the present specification including the second embodiment. According to the above-mentioned composition and its modification composition, the above-mentioned subject is solved and the above-mentioned effect can be acquired.

Modification 1 of Embodiment 2
FIG. 18 shows a block diagram of a 5G base station 400 according to the first modification of the second embodiment. As shown in FIG. 18, the 5G base station 400 includes an element off function unit 401 and a correction table 402. The element-off function unit 401 turns off the operation of the faulty element when it detects a failure of a part of the APAA element. In the correction table 402, in the case where each element is turned off, how to correct the beam control parameters of the remaining elements in order to obtain the desired beam by suppressing the influence of the elements turned off Correction information (e.g., correction parameters) regarding whether or not to be good is recorded in advance. The 5G base station 300 constitutes a communication system together with a normal 5G UE or the like.

  If a failure is detected in part of the APAA element, the 5G base station 400 turns off the operation of the element by the element OFF function unit 401. Then, the 5G base station 400 acquires a correction parameter according to the failed element based on the correction table 402, applies the correction parameter, and controls the operation of APAA.

  In the above, an example in which the correction table 402 has correction information when each element is turned off has been described. However, it is not limited to this example. For example, the correction table may have correction information for each combination of elements to be turned off when a plurality of elements are turned off simultaneously. Alternatively, the element of APAA may be divided into a plurality of blocks, and the correction information for each block may be recorded in the correction table.

  Also according to the first modification of the second embodiment, it is possible to configure a communication system which continues the operation even in the state where part of elements of APAA has failed.

  According to the first modification of the second embodiment, for example, the following configuration is provided.

  There is provided a communication system comprising a communication terminal apparatus and a base station apparatus configured to be capable of wireless communication with the communication terminal apparatus using a multi-element antenna configured of a plurality of antenna elements. More specifically, when a part of antenna elements of the multi-element antenna fails, the base station apparatus corrects the control parameter of the non-failed antenna element with the correction parameter according to the failed antenna element.

  The above-described configuration can be variously modified based on the disclosure and suggestion of the present specification including the first modification of the second embodiment. According to the above-mentioned composition and its modification composition, the above-mentioned subject is solved and the above-mentioned effect can be acquired.

Modification 2 of Embodiment 2
FIG. 19 shows a sequence diagram for explaining the operation of the communication system in the case where a failure is detected in the element of APAA in the second modification of the second embodiment. According to the example of FIG. 19, when a failure is detected in a part of elements of APAA in the 5G base station (step St4001), in step St4002, the 5G base station is the MeNB or core to which the 5G base station is connected. The network is notified of a state in which some elements of APAA have failed.

  In step St4003, the MeNB or core network that has received the failure notification instructs the adjacent 5G base station to receive the beam of the failed 5G base station and report IQ data of the received signal. The adjacent 5G base station that has received the instruction receives the beam of the failed 5G base station and reports IQ data of the received signal in step St4004. In the example of FIG. 19, for the sake of simplicity, the adjacent 5G base station reports IQ data of the received signal to the MeNB or core network that issued the instruction, but the report destination is, for example, It may be another device on the core network side or a dedicated cloud server.

  In step St4005, the MeNB or core network that receives the report from the adjacent 5G base station calculates a beam control correction parameter according to the failure status of the 5G base station. Then, the MeNB or core network transmits the calculated correction parameter to the failed 5G base station in step St4006. Note that, as described above, instead of the MeNB or core network, for example, another device on the core network side or a dedicated cloud server may calculate and transmit the correction parameter.

  The failed 5G base station corrects the beam control parameter based on the received correction parameter in step St4007.

  In the above, an example in which adjacent 5G base stations perform reception of a beam of a failed 5G base station and acquisition of IQ data has been described. However, it is not limited to this example. For example, a 5G terminal device installed exclusively for calibration of a 5G base station may be used, or using a 5G terminal device installed on a dedicated mobile vehicle or projectile (see the flying object 500 in FIG. 20). It is also good. The failed 5G base station receives the correction parameter calculated based on the information measured using the above-mentioned 5G terminal apparatus from the MeNB or core network, and receives the received correction parameter of the element of its own APAA. Reflect on control parameters.

  Also according to the second modification of the second embodiment, it is possible to configure a communication system which continues the operation even in the state where a part of the elements of APAA has failed.

  According to the second modification of the second embodiment, for example, the following configuration is provided.

  There is provided a communication system comprising a communication terminal apparatus and a base station apparatus configured to be capable of wireless communication with the communication terminal apparatus using a multi-element antenna configured of a plurality of antenna elements. More specifically, when a part of antenna elements of the multi-element antenna fails, the base station apparatus corrects the control parameter of the non-failed antenna element with the correction parameter according to the failed antenna element.

  Here, according to the second modification of the second embodiment, the communication system includes a measuring device that measures the state of a wireless beam transmitted from the base station device, and a wireless beam of the base station device measured by the measuring device. And a maintenance management device that generates a correction parameter based on the state of.

  In the above-mentioned example, the case where a measurement apparatus was constituted by other base station apparatuses which exist in a position which can communicate with a base station apparatus was explained. More specifically, the case where the other base station apparatus is, for example, the above-mentioned adjacent 5G base station has been described. Moreover, the case where a measurement apparatus is comprised by the communication terminal device which exists in the position which can communicate with a base station apparatus was also demonstrated. More specifically, the communication terminal device is, for example, a 5G terminal device (a 5G terminal device installed exclusively for calibration of a 5G base station, or a 5G terminal device installed on a dedicated mobile vehicle or a flying vehicle) I explained the case.

  Moreover, in the above-mentioned example, the case where the maintenance management apparatus is, for example, an MeNB, a core network, another apparatus on the core network side, or a dedicated cloud server has been described.

  The above-described configuration can be variously modified based on the disclosure and suggestion of the present specification including the second modification of the second embodiment. According to the above-mentioned composition and its modification composition, the above-mentioned subject is solved and the above-mentioned effect can be acquired.

  In the present invention, within the scope of the invention, each embodiment and each modification can be freely combined, or each embodiment and each modification can be suitably modified and omitted.

  Although the present invention has been described in detail, the above description is an exemplification in all aspects, and the present invention is not limited thereto. It is understood that countless variations not illustrated are conceivable without departing from the scope of the present invention.

  100, 200 communication system, 110, 210 core network (AMF / UPF), 120, 220 base station (MeNB), 130, 2305 5G base station (SgNB), 140, 250 mobile terminal (UE), 240 HeNB, 300, 400 5G base station.

Claims (9)

A base station apparatus performing wireless communication by a plurality of wireless beams;
A maintenance management device that performs maintenance management of the base station device;
The base station apparatus transmits a normality confirmation beam for normality confirmation of beam forming;
The maintenance management device
Receiving the normality confirmation beam of the base station apparatus;
When an abnormality of the normality confirmation beam is detected from the fluctuation of the reception state of the normality confirmation beam, the base station apparatus is notified that there is a possibility of a failure to a higher-order apparatus of the base station apparatus.
Communications system.   The communication system according to claim 1, wherein the maintenance management apparatus is configured by another base station apparatus existing at a position capable of communicating with the base station apparatus. The other base station apparatus is also configured to be able to transmit the normality confirmation beam,
The base station apparatus
Receiving the normality confirmation beam of the other base station apparatus;
When an abnormality of the normality confirmation beam is detected from the fluctuation of the reception condition of the normality confirmation beam, the upper base apparatus of the other base station apparatus indicates that the other base station apparatus may have a failure. Notice,
The communication system according to claim 2. The maintenance management device is configured of a communication terminal device located at a position where it can communicate with the base station device, and another base station device to which the communication terminal device is connected.
The communication terminal apparatus receives the normality confirmation beam of the base station apparatus;
The communication terminal apparatus or the other base station apparatus performs abnormality detection of the normality confirmation beam;
The other base station apparatus notifies the higher-order apparatus at the time of abnormality detection.
The communication system according to claim 1. A communication terminal device,
A base station apparatus configured to be capable of wirelessly communicating with the communication terminal apparatus using a multi-element antenna configured of a plurality of antenna elements;
When a part of the antenna elements of the multi-element antenna fails, the base station apparatus calculates the radiation power value of the multi-element antenna according to the number of failed antenna elements, and the calculated radiation power value is the base Broadcast by including in the broadcast information of the station apparatus
Communications system. A communication terminal device,
A base station apparatus configured to be capable of wirelessly communicating with the communication terminal apparatus using a multi-element antenna configured of a plurality of antenna elements;
When a part of antenna elements of the multi-element antenna fails, the base station apparatus corrects the control parameter of the non-failed antenna element with the correction parameter according to the failed antenna element.
Communications system. A measuring device for measuring the state of a radio beam transmitted from the base station device;
The communication system according to claim 6, further comprising: a maintenance management device that generates the correction parameter based on a state of the wireless beam of the base station device measured by the measurement device.   The communication system according to claim 7, wherein the measurement device is configured by another base station device present at a position capable of communicating with the base station device.   The communication system according to claim 7, wherein the measurement device is configured by a communication terminal device located at a position where it can communicate with the base station device.

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