WO2011136267A1 - Système de communication d'unité mobile - Google Patents

Système de communication d'unité mobile Download PDF

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Publication number
WO2011136267A1
WO2011136267A1 PCT/JP2011/060258 JP2011060258W WO2011136267A1 WO 2011136267 A1 WO2011136267 A1 WO 2011136267A1 JP 2011060258 W JP2011060258 W JP 2011060258W WO 2011136267 A1 WO2011136267 A1 WO 2011136267A1
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Prior art keywords
base station
mobile terminal
unit
terminal device
henb
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PCT/JP2011/060258
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English (en)
Japanese (ja)
Inventor
大成 末満
前田　美保
望月　満
靖 岩根
木村　仁
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三菱電機株式会社
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Priority to JP2012512882A priority Critical patent/JP5858909B2/ja
Publication of WO2011136267A1 publication Critical patent/WO2011136267A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/02—Power saving arrangements
    • H04W52/0203—Power saving arrangements in the radio access network or backbone network of wireless communication networks
    • H04W52/0206—Power saving arrangements in the radio access network or backbone network of wireless communication networks in access points, e.g. base stations
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/50—Allocation or scheduling criteria for wireless resources
    • H04W72/54—Allocation or scheduling criteria for wireless resources based on quality criteria
    • H04W72/542—Allocation or scheduling criteria for wireless resources based on quality criteria using measured or perceived quality
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

Definitions

  • the present invention relates to a mobile communication system that performs wireless communication between a plurality of mobile terminals and a base station.
  • the W-CDMA Wideband Code Division Multiple Access
  • HS-DSCH High-Speed-Downlink Shared Channel
  • HSDPA High-Speed-Downlink-Packet-Access
  • HSUPA High-Speed-Uplink-Packet-Access
  • W-CDMA uses code division multiple access (Code-Division-Multiple-Access)
  • LTE uses OFDM (Orthogonal Frequency-Division-Multiplexing) in the downlink direction and SC-FDMA (Single in the uplink direction).
  • Code-Division-Multiple-Access code division multiple access
  • LTE uses OFDM (Orthogonal Frequency-Division-Multiplexing) in the downlink direction and SC-FDMA (Single in the uplink direction).
  • SC-FDMA Single in the uplink direction.
  • a communication system is configured using a new core network different from the general packet radio service (GPRS), which is a core network of W-CDMA, and therefore, as an independent radio access network different from the W-CDMA network.
  • GPRS general packet radio service
  • a base station that communicates with a mobile terminal (User Equipment: UE)
  • eNB E-UTRAN NodeB
  • a base station controller Radio Network Controller
  • EPC Evolved Packet Core
  • GW Access Gateway
  • a unicast service and an E-MBMS service (Evolved Multimedia Broadcast Multicast Service) are provided.
  • the E-MBMS service is a broadcast-type multimedia service and may be simply referred to as MBMS. Mass broadcast contents such as news, weather forecasts, and mobile broadcasts are transmitted to a plurality of mobile terminals. This is also called a point-to-multipoint service.
  • Non-Patent Document 1 (Chapter 4.6.1) describes the current decisions regarding the overall architecture of the LTE system in 3GPP. The overall architecture will be described with reference to FIG. FIG. 1 is an explanatory diagram illustrating a configuration of an LTE communication system.
  • a control protocol for the mobile terminal 101 such as RRC (Radio Resource Control) and a user plane such as PDCP (Packet Data Convergence Protocol), RLC (Radio Link Control), MAC (Medium Access Control), PHY (Physical Layer) E-UTRAN (Evolved102Universal Terrestrial Radio Access) is composed of one or more base stations 102.
  • RRC Radio Resource Control
  • PDCP Packet Data Convergence Protocol
  • RLC Radio Link Control
  • MAC Medium Access Control
  • PHY Physical Layer
  • E-UTRAN Evolved102Universal Terrestrial Radio Access
  • the base station 102 performs scheduling (scheduling) and transmission of a paging signal (also called a paging message or paging message) notified from an MME (Mobility Management Entity) 103.
  • Base stations 102 are connected to each other via an X2 interface.
  • the base station 102 is connected to an EPC (Evolved Packet Core) via an S1 interface. More specifically, the base station 102 is connected to an MME (Mobility Management Entity) 103 via an S1_MME interface, and is connected to an S-GW (Serving Gateway) 104 via an S1_U interface.
  • EPC Evolved Packet Core
  • the MME 103 distributes a paging signal to a plurality or a single base station 102. Further, the MME 103 performs mobility control (Mobility control) in a standby state (Idle State). The MME 103 manages a tracking area (Tracking Area) list when the mobile terminal is in a standby state and in an active state (Active State).
  • Mobility control mobility control
  • Idle State standby state
  • the MME 103 manages a tracking area (Tracking Area) list when the mobile terminal is in a standby state and in an active state (Active State).
  • the S-GW 104 transmits / receives user data to / from one or a plurality of base stations 102.
  • the S-GW 104 becomes a local mobility anchor point (Mobility Anchor Point) during handover between base stations.
  • the EPC further includes a P-GW (PDN Gateway), which performs packet filtering and UE-ID address allocation for each user.
  • PDN Gateway PDN Gateway
  • the control protocol RRC between the mobile terminal 101 and the base station 102 performs broadcast, paging, RRC connection management (RRC connection management), and the like.
  • RRC_IDLE and RRC_CONNECTED are states of the base station and the mobile terminal in RRC.
  • PLMN Public Land Mobile Mobile Network
  • SI System Information
  • a mobile terminal has an RRC connection (connection), can transmit and receive data to and from the network, and performs handover (Handover: HO), measurement of a neighbor cell (Neighbour cell), and the like.
  • RRC_IDLE is also simply referred to as IDLE, a wait state.
  • RRC_CONNECTED is also simply referred to as CONNECTED or connection state.
  • Non-Patent Document 1 (Chapter 5) describes the current decisions regarding the frame configuration in the LTE system in 3GPP, with reference to FIG.
  • FIG. 2 is an explanatory diagram showing a configuration of a radio frame used in the LTE communication system.
  • one radio frame (Radio frame) is 10 ms.
  • the radio frame is divided into ten equally sized subframes.
  • the subframe is divided into two equally sized slots.
  • a downlink synchronization signal (Downlink Synchronization Signal: SS) 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).
  • MBSFN subframe For each subframe, multiplexing of a channel for MBSFN (Multimedia broadcast multicast service Single Frequency Network) and a channel for other than MBSFN is performed.
  • MBSFN subframe a subframe for MBSFN transmission
  • MBSFN subframe MBSFN subframe
  • Non-Patent Document 2 describes a signaling example at the time of MBSFN subframe allocation.
  • FIG. 3 is an explanatory diagram showing the configuration of the MBSFN frame.
  • an MBSFN subframe is allocated for each MBSFN frame (MBSFN frame).
  • a set of MBSFN frames (MBSFN frame Cluster) is scheduled.
  • a repetition period (Repetition Period) of a set of MBSFN frames is assigned.
  • Non-Patent Document 1 (Chapter 5) describes the current decisions regarding the channel configuration in the LTE system in 3GPP. It is assumed that the CSG cell (ClosednSubscriber Group ⁇ ⁇ ⁇ ⁇ cell) uses the same channel configuration as the non-CSG cell.
  • a physical channel will be described with reference to FIG.
  • FIG. 4 is an explanatory diagram illustrating physical channels used in the LTE communication system.
  • a physical broadcast channel (Physical401Broadcast channel: PBCH) 401 is a channel for downlink transmission from the base station 102 to the mobile terminal 101.
  • a BCH transport block (transport block) is mapped to four subframes in a 40 ms interval. There is no obvious signaling of 40ms timing.
  • a physical control channel format indicator channel (Physical Control Format Indicator Indicator Channel: PCFICH) 402 is a channel for downlink transmission from the base station 102 to the mobile terminal 101.
  • PCFICH notifies base station 102 to mobile terminal 101 about the number of OFDM symbols used for PDCCHs.
  • PCFICH is transmitted for each subframe.
  • a physical downlink control channel (Physical Downlink Control Channel: PDCCH) 403 is a channel for downlink transmission from the base station 102 to the mobile terminal 101.
  • the PDCCH includes resource allocation, HARQ (HybridbrRepeat reQuest) information on DL-SCH (a downlink shared channel which is one of the transport channels shown in FIG. 5 described later), PCH (transformer shown in FIG. 5).
  • a paging channel which is one of the port channels).
  • the PDCCH carries an uplink scheduling grant (Uplink Scheduling Grant).
  • the PDCCH carries Ack (Acknowledgement) / Nack (Negative Acknowledgment) which is a response signal for uplink transmission.
  • the PDCCH is also called an L1 / L2 control signal.
  • a physical downlink shared channel (PDSCH) 404 is a channel for downlink transmission from the base station 102 to the mobile terminal 101.
  • DL-SCH (downlink shared channel) that is a transport channel and PCH that is a transport channel are mapped to the PDSCH.
  • a physical multicast channel (PMCH) 405 is a channel for downlink transmission from the base station 102 to the mobile terminal 101.
  • a multicast channel (Multicast Channel: MCH) that is a transport channel is mapped to the PMCH.
  • a physical uplink control channel (Physical Uplink Control Channel: PUCCH) 406 is a channel for uplink transmission from the mobile terminal 101 to the base station 102.
  • the PUCCH carries Ack / Nack which is a response signal (response) to downlink transmission.
  • the PUCCH carries a CQI (Channel Quality Indicator) report.
  • CQI is quality information indicating the quality of received data or channel quality.
  • the PUCCH carries a scheduling request (SR).
  • a physical uplink shared channel (Physical-Uplink-Shared-Channel: PUSCH) 407 is a channel for uplink transmission from the mobile terminal 101 to the base station 102.
  • UL-SCH uplink shared channel which is one of the transport channels shown in FIG. 5 is mapped to PUSCH.
  • the physical HARQ indicator channel (Physical Hybrid ARQ Indicator Channel: PHICH) 408 is a channel for downlink transmission from the base station 102 to the mobile terminal 101.
  • PHICH carries Ack / Nack which is a response to uplink transmission.
  • a physical random access channel (Physical Random Access Channel: PRACH) 409 is a channel for uplink transmission from the mobile terminal 101 to the base station 102.
  • the PRACH carries a random access preamble.
  • Downlink reference signal is a symbol known as a mobile communication system.
  • the downlink reference signal is inserted into the first, third and last OFDM symbols of each slot.
  • RSRP reference symbol received power
  • FIG. 5 is an explanatory diagram for explaining a transport channel used in an LTE communication system.
  • FIG. 5A shows the mapping between the downlink transport channel and the downlink physical channel.
  • FIG. 5B shows mapping between the uplink transport channel and the uplink physical channel.
  • BCH Broadcast Channel
  • PBCH physical broadcast channel
  • HARQ Hybrid ARQ
  • the DL-SCH can be broadcast to the entire coverage of the base station (cell).
  • DL-SCH supports dynamic or semi-static resource allocation. Quasi-static resource allocation is also referred to as persistent scheduling.
  • DL-SCH supports DRX (Discontinuous reception) of a mobile terminal in order to reduce power consumption of the mobile terminal.
  • the DL-SCH is mapped to the physical downlink shared channel (PDSCH).
  • the Paging Channel supports DRX of the mobile terminal in order to enable low power consumption of the mobile terminal.
  • the PCH is required to be broadcast to the entire coverage of the base station (cell).
  • the PCH is mapped to a physical resource such as a physical downlink shared channel (PDSCH) that can be dynamically used for traffic, or a physical resource such as a physical downlink control channel (PDCCH) of another control channel.
  • the multicast channel (Multicast Channel: MCH) is used for broadcast to the entire coverage of the base station (cell).
  • the MCH supports SFN combining of MBMS services (MTCH and MCCH) in multi-cell transmission.
  • the MCH supports quasi-static resource allocation.
  • MCH is mapped to PMCH.
  • Retransmission control by HARQ is applied to the uplink shared channel (Uplink Shared Channel: UL-SCH).
  • UL-SCH supports dynamic or semi-static resource allocation.
  • UL-SCH is mapped to a physical uplink shared channel (PUSCH).
  • the random access channel (Random Access Channel: RACH) shown in FIG. 5B is limited to control information.
  • RACH is at risk of collision.
  • the RACH is mapped to a physical random access channel (PRACH).
  • HARQ is a technique for improving the communication quality of a transmission path by a combination of automatic retransmission request (Automatic Repeat reQuest: ARQ) and error correction (Forward Error Correction).
  • ARQ Automatic Repeat reQuest
  • error correction Forward Error Correction
  • HARQ has an advantage that error correction functions effectively by retransmission even for a transmission path whose communication quality changes. In particular, further quality improvement can be obtained by combining the initial transmission reception result and the retransmission reception result upon retransmission.
  • Chase combining is a method of transmitting the same data in initial transmission and retransmission, and is a method of improving gain by combining initial transmission data and retransmission data in retransmission. This means that even if there is an error in the initial transmission data, the data is partially accurate, and the data is transmitted with higher accuracy by combining the correct initial transmission data and the retransmission data. It is based on the idea that it can be done.
  • Another example of the HARQ method is IR (Incremental Redundancy). IR is to increase redundancy, and by transmitting parity bits in retransmission, the redundancy is increased in combination with initial transmission, and the quality is improved by an error correction function.
  • FIG. 6 is an explanatory diagram illustrating logical channels used in the LTE communication system.
  • FIG. 6A shows mapping between the downlink logical channel and the downlink transport channel.
  • FIG. 6B shows mapping between the uplink logical channel and the uplink transport channel.
  • the broadcast control channel (Broadcast Control Channel: BCCH) is a downlink channel for broadcast system control information.
  • BCCH Broadcast Control Channel
  • the BCCH that is a logical channel is mapped to a broadcast channel (BCH) that is a transport channel or a downlink shared channel (DL-SCH).
  • BCH broadcast channel
  • DL-SCH downlink shared channel
  • the paging control channel is a downlink channel for transmitting a paging signal.
  • PCCH is used when the network does not know the cell location of the mobile terminal.
  • the PCCH that is a logical channel is mapped to a paging channel (PCH) that is a transport channel.
  • the common control channel (Common Control Channel: CCCH) is a channel for transmission control information between the mobile terminal and the base station.
  • CCCH is used when the mobile terminal does not have an RRC connection with the network.
  • the CCCH is mapped to a downlink shared channel (DL-SCH) that is a transport channel.
  • DL-SCH downlink shared channel
  • UL-SCH uplink shared channel
  • the multicast control channel (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 mobile terminal.
  • MCCH is used only for mobile terminals that are receiving MBMS.
  • the MCCH is mapped to the downlink shared channel (DL-SCH) or multicast channel (MCH) which is a transport channel.
  • DL-SCH downlink shared channel
  • MCH multicast channel
  • the dedicated control channel (Dedicated Control Channel: DCCH) is a channel for transmitting dedicated control information between the mobile terminal and the network.
  • the DCCH is mapped to the uplink shared channel (UL-SCH) in the uplink, and is mapped to the downlink shared channel (DL-SCH) in the downlink.
  • the dedicated traffic channel (Dedicated Traffic Channel: DTCH) is a channel for one-to-one communication to individual mobile terminals for transmitting user information.
  • DTCH exists for both uplink and downlink.
  • the DTCH is mapped to the uplink shared channel (UL-SCH) in the uplink, and is mapped to the downlink shared channel (DL-SCH) in the downlink.
  • UL-SCH uplink shared channel
  • DL-SCH downlink shared channel
  • the multicast traffic channel is a downlink channel for transmitting traffic data from the network to the mobile terminal.
  • MTCH is a channel used only for a mobile terminal that is receiving MBMS.
  • the MTCH is mapped to a downlink shared channel (DL-SCH) or a multicast channel (MCH).
  • DL-SCH downlink shared channel
  • MCH multicast channel
  • GCI is a global cell identifier (Global Cell Identity).
  • CSG cells Closed Subscriber Group Cell
  • the CSG cell will be described below (see Non-Patent Document 3, Chapter 3.1).
  • a CSG (Closed Subscriber Group) cell is a cell in which an operator identifies an available subscriber (hereinafter may be referred to as a “specific subscriber cell”).
  • the identified subscribers are allowed to access one or more E-UTRAN cells of the PLMN (Public Land Mobile Mobile Network).
  • PLMN Public Land Mobile Mobile Network
  • One or more E-UTRAN cells to which the identified subscribers are allowed access are referred to as “CSG cells (CSG cell (s))”.
  • PLMN Public Land Mobile Mobile Network
  • a CSG cell is a part of a PLMN that broadcasts a unique CSG identity (CSG identity: CSG ID; CSG-ID). Members of the subscriber group who have been registered in advance and permitted access the CSG cell using the CSG-ID as access permission information.
  • CSG identity CSG ID; CSG-ID.
  • the CSG-ID is broadcast by the CSG cell or cell. There are a plurality of CSG-IDs in a mobile communication system. The CSG-ID is then used by the mobile terminal (UE) to facilitate access of CSG related members.
  • the location tracking of a mobile terminal is performed in units of areas composed of one or more cells. The position tracking is to enable tracking of the position of the mobile terminal and calling (the mobile terminal receives a call) even in the standby state. This area for tracking the location of the mobile terminal is called a tracking area.
  • the CSG white list (CSG white list) is a list stored in a USIM (Universal Subscriber Identity Module) in which all CSG IDs of CSG cells to which the subscriber belongs are recorded. The CSG white list may be referred to as an allowed CSG list (Allowed CSG ID List).
  • Suitable cell will be described below (see Non-Patent Document 3, Chapter 4.3).
  • a “suitable cell” is a cell that the UE camps on to receive normal service. Such a cell shall satisfy the following conditions:
  • the cell is a selected PLMN or a registered PLMN, or a part of the PLMN in the “Equivalent PLMN list”.
  • the cell is not a barred cell.
  • B And not a part of the “Forbidden LAs” list, but a part of at least one tracking area (TA). In that case, the cell needs to satisfy the above (1).
  • C The cell satisfies the cell selection evaluation criteria.
  • D The cell is a CSG cell according to system information (SI). For the identified cell, the CSG-ID shall be part of the UE's “CSG WhiteList” (included in the UE's CSG WhiteList).
  • “Acceptable cell” will be described below (see Non-Patent Document 3, Chapter 4.3). This is a cell where the UE camps on in order to receive a limited service (emergency call). Such a cell shall satisfy all the following requirements: That is, the minimum set of requirements for initiating an emergency call in an E-UTRAN network is shown below. (1) The cell is not a barred cell. (2) The cell satisfies the cell selection evaluation criteria.
  • “Cam camp on cell” means that the UE has completed the cell selection (cell selection) or cell reselection (cell re-selection) process, and the UE monitors the system information and paging information. Selected state.
  • Non-Patent Document 4 discloses three different modes of access to HeNB and HNB. Specifically, an open access mode (Open access mode), a closed access mode (Closed access mode), and a hybrid access mode (Hybrid access mode).
  • Open access mode Open access mode
  • closed access mode closed access mode
  • Hybrid access mode Hybrid access mode
  • Each mode has the following characteristics.
  • the HeNB or HNB In the open access mode, the HeNB or HNB is operated as a normal cell of a normal operator.
  • the closed access mode the HeNB or HNB is operated as a CSG cell. This is a CSG cell accessible only to CSG members.
  • a non-CSG member In the hybrid access mode, a non-CSG member is a CSG cell to which access is permitted at the same time.
  • a cell in hybrid access mode (also referred to as a hybrid cell) is a cell that supports both an open access mode and a closed access mode.
  • Non-Patent Document 5 discloses a basic operation of a mobile terminal using PCI split.
  • a mobile terminal that does not have PCI split information needs to perform cell search using all PCIs, for example, using all 504 codes.
  • a mobile terminal having PCI split information can perform a cell search using the PCI split information.
  • LTE-A Long Term Evolution Advanced
  • relay relay node
  • the relay node is wirelessly connected to the radio access network via a donor cell (Donor cell; Donor eNB; DeNB).
  • Donor cell Donor cell; Donor eNB; DeNB
  • the network (NW) to relay link shares the same frequency band as the network to UE link.
  • a Release 8 UE can also be connected to the donor cell.
  • a link between the donor cell and the relay node is referred to as a backhaul link, and a link between the relay node and the UE is referred to as an access link.
  • transmission from DeNB to RN is performed in a downlink (DL) frequency band
  • transmission from RN to DeNB is performed in an uplink (UL) frequency band.
  • DL downlink
  • UL uplink
  • a link from DeNB to RN and a link from RN to UE are time-division multiplexed in one frequency band
  • a link from RN to DeNB and a link from UE to RN are also one frequency band. Is time-division multiplexed. By doing so, it is possible to prevent the relay transmission from interfering with the reception of the own relay in the relay.
  • Heterogeneous networks was added as one of the technologies to be studied in LTE-A.
  • low output power local area range network nodes such as pico eNBs (pico cells), hot zone cell nodes, HeNB / HNB / CSG cells, relay nodes, remote radio heads (RRH) It has been decided to handle.
  • a base station or cell adopted as a capacity booster monitors the traffic load and switches off if the traffic stays below a certain threshold for a certain period of time. Yes (see Non-Patent Document 8).
  • the base station can request the switched-on base station to switch on (see Non-Patent Document 8).
  • the base station that can be switched off is a cell that provides basic coverage and basic capacity (see Non-Patent Document 9).
  • Non-Patent Document 10 Generally, cells that provide basic coverage and basic capacity are considered wide-area eNBs (see Non-Patent Document 10). From this, it can be considered that the network node in the local area range is not considered in the technique disclosed in Non-Patent Document 8. Therefore, the technique disclosed in Non-Patent Document 8 has a problem that low power consumption cannot be realized in a network node in the local area range.
  • Patent Document 1 discloses a technique related to low power consumption in a network node in a local area range.
  • the base station in a wireless communication system including a femto base station such as a Home-eNB, the base station is connected to the base station from the network side according to the location status of the mobile terminal in the cell formed by the base station.
  • the radio signal output of the femto base station is stopped or started.
  • the radio signal output of the femto base station is controlled by an instruction from the network side, so that the load on the network side increases.
  • the radio signal output of the femto base station is controlled according to the location status of the mobile terminal, but due to factors other than the location status of the mobile terminal, the femto base Sometimes it is better to restrict the operation of network nodes such as stations. For example, when a device on the backhaul side cannot be connected to the network node due to a failure or the like, the network node cannot normally communicate with the mobile terminal even if the power is turned on. In such a case, turning on the power supply of the network node causes wasteful power consumption. In such a case, limiting the operation of the network node is not disclosed in Patent Document 1.
  • the conventional technology cannot efficiently reduce the power consumption of the network node in the local area range.
  • An object of the present invention is to provide a mobile communication system capable of efficiently reducing power consumption in a network node in a local area range.
  • a mobile communication system of the present invention is a mobile communication system comprising a mobile terminal device, a base station device capable of wireless communication with the mobile terminal device, and a core network to which the base station device is connected so as to be capable of wired communication. And a connection device that is interposed between the base station device and the core network and connects the base station device and the core network so that wired communication is possible, and a connection between the base station device and the connection device.
  • a connection disconnection detecting means for detecting whether or not the mobile terminal apparatus is disconnected, and the base station apparatus transmits a downlink transmission signal to be transmitted to the mobile terminal apparatus and receives an uplink transmission signal transmitted from the mobile terminal apparatus It is configured to be able to shift from a normal operation state in which the operation is performed to a low power operation state in which the transmission operation and the reception operation are stopped, When it is detected that the connection between the location and the connection device is disconnected, the base station apparatus, wherein characterized in that an instruction to shift to the low power operating state.
  • the mobile communication system of the present invention includes a mobile terminal device, a base station device capable of wireless communication with the mobile terminal device, another base station device capable of wireless communication with the mobile terminal device, the base station device, A mobile communication system comprising a core network to which the other base station apparatus is connected so as to be capable of wired communication, the quality of a radio channel established between the base station apparatus and the mobile terminal apparatus; Comprising a channel quality comparison means for comparing the quality of another radio channel established between another base station device and the mobile terminal device, wherein the base station device transmits a downlink transmission signal to be transmitted to the terminal device The normal operation state in which the transmission operation and the reception operation of the uplink transmission signal transmitted from the terminal apparatus are shifted to the low power operation state in which the transmission operation and the reception operation are stopped. If the quality comparison unit determines that the quality of the other radio channel is higher than the quality of the radio channel and the other radio channel, the quality comparison unit causes the base station apparatus to shift to the low power operation state. It is characterized by instructing.
  • the mobile communication system of the present invention is a mobile communication system comprising a mobile terminal device registered in advance and a base station device capable of wireless communication with the mobile terminal device, wherein the base station device A processing unit configured to rewrite a processing circuit for processing a wireless communication operation with a terminal device; and a rewriting unit to rewrite the processing circuit of the processing unit according to the number of the mobile terminal devices registered in advance.
  • the rewriting means rewrites the processing circuit of the processing means so that the same number of the processing circuits as the number of the mobile terminal apparatuses registered in advance is formed.
  • the mobile communication system of the present invention is a mobile communication system comprising a mobile terminal device registered in advance and a base station device capable of wireless communication with the mobile terminal device, wherein the base station device
  • the frequency band used for wireless communication with the terminal device is configured to be switchable, and includes a wireless unit that wirelessly communicates with the mobile terminal device, and a band switching unit that switches a frequency band used in the wireless unit, The switching unit switches a frequency band used in the radio unit based on mobile terminal information including at least one of the number and attributes of the mobile terminal devices registered in advance.
  • the mobile communication system of the present invention is a mobile communication system comprising a mobile terminal device registered in advance and a base station device capable of wireless communication with the mobile terminal device, wherein the base station device
  • the frequency band used for wireless communication with the terminal device is configured to be switchable, and includes a wireless unit that wirelessly communicates with the mobile terminal device, and a band switching unit that switches a frequency band used in the wireless unit, The switching unit switches a frequency band used in the radio unit based on information determined by the base station apparatus.
  • the mobile communication system of the present invention is a mobile communication system comprising a mobile terminal device registered in advance and a base station device capable of wireless communication with the mobile terminal device, wherein the base station device
  • the frequency band used for wireless communication with the terminal device is configured to be switchable, and includes a wireless unit that wirelessly communicates with the mobile terminal device, and a band switching unit that switches a frequency band used in the wireless unit, The switching unit switches the frequency band used in the radio unit based on an instruction from the base station host apparatus.
  • a mobile communication system includes a mobile terminal device, a base station device, and a core network.
  • the base station device and the core network are connected by a connection device so that wired communication is possible.
  • the connection disconnection detecting means detects that the connection between the base station apparatus and the connection apparatus is disconnected
  • the base station apparatus is shifted from the normal operation state to the low power operation state according to an instruction from the connection disconnection detection means.
  • the base station device In a state where the connection between the base station device and the connection device is disconnected, the base station device is in a state where the connection with the core network is disconnected and cannot function as a base station device.
  • the base station apparatus in a state where the function as the base station apparatus cannot be performed is shifted from the normal operation state to the low power operation state according to an instruction from the connection disconnection detection unit.
  • the power consumption can be reduced compared to the case where the base station apparatus in a state where the function as the base station apparatus cannot be performed is in the normal operation state. Therefore, it is possible to efficiently reduce the power consumption in the base station apparatus that is a network node in the local area range.
  • a mobile communication system is configured by including a mobile terminal device, a base station device, another base station device, and a core network.
  • the mobile communication system includes a line quality comparison unit.
  • this channel quality comparison means the quality of the radio channel established between the base station device and the mobile terminal device and the quality of the other radio channel established between the other base station device and the mobile terminal device Are compared.
  • the channel quality comparison unit determines that the quality of the other radio channel is higher, the base station apparatus is shifted from the normal operation state to the low power operation state according to the instruction of the channel quality comparison unit.
  • the quality of the backhaul connecting the base station device and the core network is degraded
  • the quality of the radio channel established between the base station device and the mobile terminal device is degraded
  • the other base station device and the mobile terminal When the quality of the other radio link established with the apparatus becomes higher, the base station apparatus is shifted from the normal operation state to the low power consumption state.
  • the user of the mobile terminal apparatus can be prompted to communicate with another base station apparatus, so that the possibility of the user of the mobile terminal apparatus receiving the disadvantages due to the deterioration of the quality of the radio channel is reduced. Can do.
  • the base station device is operated in a normal operation state when a higher-quality wireless channel can be established with the mobile terminal device than other base station devices, and the lower-quality wireless channel. Is established, a low power operating state is entered. As a result, power consumption can be reduced compared to the case where the base station apparatus is always operated in the normal operation state. Therefore, it is possible to efficiently reduce the power consumption in the base station apparatus that is a network node in the local area range.
  • a mobile communication system is configured by including a mobile terminal device and a base station device registered in advance.
  • the base station apparatus includes processing means and rewriting means.
  • a processing circuit for processing a wireless communication operation with the mobile terminal device is formed in the processing means.
  • the processing circuit of the processing means is configured to be rewritable and is rewritten by the rewriting means so as to form the same number of processing circuits as the number of mobile terminal devices registered in advance.
  • the power consumption of the base station apparatus can be reduced compared to the case where the processing means is provided in advance with the same number of processing circuits as the number of mobile terminal apparatuses that can be accommodated by the base station apparatus. It is possible to efficiently reduce power consumption in the base station apparatus that is a node.
  • a mobile communication system is configured by including a mobile terminal device and a base station device registered in advance.
  • the base station apparatus includes a radio unit and a band switching unit.
  • the wireless unit is configured to be able to switch a frequency band used for wireless communication with the mobile terminal device.
  • the frequency band used in the radio unit is switched by the band switching unit based on mobile terminal information including at least one of the number and attributes of mobile terminal devices registered in advance.
  • the frequency band used in the radio unit is switched to a relatively narrow frequency band.
  • Power consumption can be reduced. Therefore, it is possible to efficiently reduce the power consumption in the base station apparatus that is a network node in the local area range.
  • a mobile communication system is configured by including a mobile terminal device and a base station device registered in advance.
  • the base station apparatus includes a radio unit and a band switching unit.
  • the wireless unit is configured to be able to switch a frequency band used for wireless communication with the mobile terminal device.
  • the frequency band used in the radio unit is switched by the band switching unit based on information determined by the base station apparatus.
  • a mobile communication system is configured by including a mobile terminal device and a base station device registered in advance.
  • the base station apparatus includes a radio unit and a band switching unit.
  • the wireless unit is configured to be able to switch a frequency band used for wireless communication with the mobile terminal device.
  • the frequency band used in the radio unit is switched by the band switching unit based on an instruction from the base station host apparatus. Accordingly, in accordance with an instruction from the base station host apparatus, it is possible to limit the frequency band used in the radio unit and limit the operation of the radio unit, thereby reducing power consumption. Therefore, it is possible to efficiently reduce the power consumption in the base station apparatus that is a network node in the local area range.
  • FIG. 2 is an explanatory diagram showing a configuration of a radio frame used in an LTE communication system. It is explanatory drawing which shows the structure of a MBSFN frame. It is explanatory drawing explaining the physical channel used with the communication system of a LTE system. It is explanatory drawing explaining the transport channel used with the communication system of a LTE system. It is explanatory drawing explaining the logical channel used with the communication system of a LTE system. It is a block diagram which shows the whole structure of the mobile communication system of the LTE system currently discussed in 3GPP. It is a block diagram which shows the structure of the mobile terminal (mobile terminal 71 of FIG. 7) which concerns on this invention.
  • 5 is a flowchart illustrating an outline from a cell search to a standby operation performed by a mobile terminal (UE) in an LTE communication system. It is a block diagram which shows the structure of the mobile communication system 600 of Embodiment 1 of this invention. It is a block diagram which shows the structure of HeNB1200 of Embodiment 2 of this invention.
  • FIG. 19 is a diagram showing frequency scheduling and subcarriers when a band limiting method for eliminating one of the bands A and B shown in FIG. 18 is used.
  • FIG. 19 is a diagram showing frequency scheduling and subcarriers when the method of reducing the bandwidths of two bands A and B shown in FIG. 18 is used. It is a figure which shows the frequency scheduling at the time of using the band-limiting method which loses data transmission alternately for every subcarrier, and a subcarrier.
  • FIG. 7 is a block diagram showing the overall configuration of an LTE mobile communication system currently under discussion in 3GPP.
  • CSG Cell Subscriber Group
  • E-UTRAN Home-eNodeB Home-eNodeB
  • HeNB HeNB
  • UTRAN Home-NB HNB
  • non-CSG cells E-UTRAN eNodeB
  • eNB UTRAN NodeB
  • GERAN BSS GERAN BSS
  • a mobile terminal device (hereinafter referred to as “user terminal (UE)”) 71 is capable of wireless communication with a base station device (hereinafter referred to as “base station”) 72 and transmits and receives signals by wireless communication.
  • the base station 72 is classified into an eNB 72-1 and a Home-eNB 72-2.
  • the eNB 72-1 is connected to the MME, S-GW, or the MME / S-GW unit (hereinafter referred to as “MME unit”) 73 including the MME and the S-GW via the S1 interface. Control information is communicated between the two.
  • a plurality of MME units 73 may be connected to one eNB 72-1.
  • the eNBs 72-1 are connected by the X2 interface, and control information is communicated between the eNBs 72-1.
  • the Home-eNB 72-2 is connected to the MME unit 73 via the S1 interface, and control information is communicated between the Home-eNB 72-2 and the MME unit 73.
  • a plurality of Home-eNBs 72-2 are connected to one MME unit 73.
  • the Home-eNB 72-2 is connected to the MME unit 73 via a HeNBGW (Home-eNB GateWay) 74.
  • Home-eNB 72-2 and HeNBGW 74 are connected via an S1 interface, and HeNBGW 74 and MME unit 73 are connected via an S1 interface.
  • One or a plurality of Home-eNBs 72-2 are connected to one HeNBGW 74, and information is communicated through the S1 interface.
  • the HeNBGW 74 is connected to one or a plurality of MME units 73, and information is communicated through the S1 interface.
  • the X2 interface between Home-eNB 72-2 is not supported. From the MME unit 73, the HeNBGW 74 appears as an eNB 72-1. From the Home-eNB 72-2, the HeNBGW 74 appears as the MME unit 73. Regardless of whether or not the Home-eNB 72-2 is connected to the MME unit 73 via the HeNBGW 74, the interface between the Home-eNB 72-2 and the MME unit 73 is the same in the S1 interface. The HeNBGW 74 does not support mobility to the Home-eNB 72-2 or mobility from the Home-eNB 72-2 that spans a plurality of MME units 73. Home-eNB 72-2 supports only one cell.
  • FIG. 8 is a block diagram showing a configuration of a mobile terminal (mobile terminal 71 in FIG. 7) according to the present invention.
  • a transmission process of the mobile terminal 71 shown in FIG. 8 will be described.
  • control data from the protocol processing unit 801 and user data from the application unit 802 are stored in the transmission data buffer unit 803.
  • the data stored in the transmission data buffer unit 803 is transferred to the encoder unit 804 and subjected to encoding processing such as error correction.
  • the data encoded by the encoder unit 804 is modulated by the modulation unit 805.
  • the modulated data is converted into a baseband signal, and then output to the frequency conversion unit 806, where it is converted into a radio transmission frequency.
  • a transmission signal is transmitted from the antenna 807 to the base station 72.
  • the reception process of the mobile terminal 71 is executed as follows.
  • a radio signal from the base station 72 is received by the antenna 807.
  • the reception signal is converted from a radio reception frequency to a baseband signal by the frequency conversion unit 806, and demodulated by the demodulation unit 808.
  • the demodulated data is passed to the decoder unit 809 and subjected to decoding processing such as error correction.
  • control data is passed to the protocol processing unit 801, and user data is passed to the application unit 802.
  • a series of processing of the mobile terminal 71 is controlled by the control unit 810. Therefore, the control unit 810 is connected to the respective units 801 to 809, which is omitted in FIG.
  • FIG. 9 is a block diagram showing the configuration of the base station (base station 72 in FIG. 7) according to the present invention.
  • the transmission process of the base station 72 shown in FIG. 9 will be described.
  • the EPC communication unit 901 transmits and receives data between the base station 72 and the EPC (including the MME unit 73, the HeNBGW 74, and the like) that is a core network.
  • the other base station communication unit 902 transmits / receives data to / from other base stations. Since the X2 interface between the Home-eNB 72-2 is a direction that is not supported, the Home-eNB 72-2 may not include the other base station communication unit 902.
  • the EPC communication unit 901 and the other base station communication unit 902 exchange information with the protocol processing unit 903, respectively. Control data from the protocol processing unit 903 and user data and control data from the EPC communication unit 901 and the other base station communication unit 902 are stored in the transmission data buffer unit 904.
  • the data stored in the transmission data buffer unit 904 is transferred to the encoder unit 905 and subjected to encoding processing such as error correction. There may exist data that is directly output from the transmission data buffer unit 904 to the modulation unit 906 without performing the encoding process.
  • the encoded data is subjected to modulation processing by the modulation unit 906.
  • the modulated data is converted into a baseband signal, and then output to the frequency conversion unit 907 to be converted into a radio transmission frequency. Thereafter, a transmission signal is transmitted from the antenna 908 to one or a plurality of mobile terminals 71.
  • the reception process of the base station 72 is executed as follows. Radio signals from one or a plurality of mobile terminals 71 are received by the antenna 908. The reception signal is converted from a radio reception frequency to a baseband signal by the frequency conversion unit 907, and demodulated by the demodulation unit 909. The demodulated data is transferred to the decoder unit 910 and subjected to decoding processing such as error correction. Of the decoded data, the control data is passed to the protocol processing unit 903 or the EPC communication unit 901 and the other base station communication unit 902, and the user data is passed to the EPC communication unit 901 and the other base station communication unit 902. A series of processing of the base station 72 is controlled by the control unit 911. Therefore, although not shown in FIG. 9, the control unit 911 is connected to the units 901 to 910.
  • the functions of Home-eNB 72-2 currently being discussed in 3GPP are shown below (see Non-Patent Document 1, Chapter 4.6.2).
  • the Home-eNB 72-2 has the same function as the eNB 72-1.
  • the Home-eNB 72-2 has a function of finding an appropriate serving HeNBGW 74.
  • the Home-eNB 72-2 is only connected to one HeNBGW 74. That is, in the case of connection with the HeNBGW 74, the Home-eNB 72-2 does not use the Flex function in the S1 interface.
  • the Home-eNB 72-2 is not simultaneously connected to another HeNBGW 74 or another MME unit 73.
  • the TAC and PLMN ID of the Home-eNB 72-2 are supported by the HeNBGW 74.
  • the selection of the MME unit 73 in “UE attachment” is performed by the HeNBGW 74 instead of the Home-eNB 72-2.
  • Home-eNB 72-2 may be deployed without network planning. In this case, Home-eNB 72-2 is moved from one geographic region to another. Therefore, the Home-eNB 72-2 in this case needs to be connected to different HeNBGW 74 depending on the position.
  • FIG. 10 is a block diagram showing the configuration of the MME (MME unit 73 in FIG. 7) according to the present invention.
  • the PDN GW communication unit 1001 transmits and receives data between the MME unit 73 and the PDN GW.
  • the base station communication unit 1002 performs data transmission / reception between the MME unit 73 and the base station 72 through the S1 interface. If the data received from the PDN GW is user data, the user data is passed from the PDN GW communication unit 1001 to the base station communication unit 1002 via the user plane communication unit 1003 to one or a plurality of base stations 72. Sent. When the data received from the base station 72 is user data, the user data is passed from the base station communication unit 1002 to the PDN GW communication unit 1001 via the user plane communication unit 1003 and transmitted to the PDN GW.
  • control data is passed from the PDN GW communication unit 1001 to the control plane control unit 1005.
  • control data is transferred from the base station communication unit 1002 to the control plane control unit 1005.
  • the HeNBGW communication unit 1004 is provided when the HeNBGW 74 exists, and transmits and receives data through an interface (IF) between the MME unit 73 and the HeNBGW 74 depending on the information type.
  • the control data received from the HeNBGW communication unit 1004 is passed from the HeNBGW communication unit 1004 to the control plane control unit 1005.
  • the result of processing in the control plane control unit 1005 is transmitted to the PDN GW via the PDN GW communication unit 1001. Further, the result processed by the control plane control unit 1005 is transmitted to one or a plurality of base stations 72 via the S1 interface via the base station communication unit 1002, and to one or a plurality of HeNBGWs 74 via the HeNBGW communication unit 1004. Sent.
  • the control plane control unit 1005 includes a NAS security unit 1005-1, an SAE bearer control unit 1005-2, an idle state mobility management unit 1005-3, and the like, and performs overall processing for the control plane.
  • the NAS security unit 1005-1 performs security of a NAS (Non-Access Stratum) message.
  • the SAE bearer control unit 1005-2 manages a bearer of SAE (System Architecture) Evolution.
  • the idle state mobility management unit 1005-3 manages mobility in a standby state (LTE-IDLE state, also simply referred to as idle), generation and control of a paging signal in the standby state, and one or more mobile terminals 71 being served thereby Add, delete, update, search, and track area list (TA ⁇ ⁇ ⁇ List) management.
  • the MME unit 73 initiates the paging protocol by transmitting a paging message to a cell belonging to a tracking area (tracking area: Tracking Area: TA) in which the UE is registered.
  • the idle state mobility management unit 1005-3 may perform CSG management, CSG-ID management, and white list management of the Home-eNB 72-2 connected to the MME unit 73.
  • the relationship between the mobile terminal corresponding to the CSG-ID and the CSG cell is managed (added, deleted, updated, searched). For example, it may be a relationship between one or a plurality of mobile terminals registered for user access with a certain CSG-ID and a CSG cell belonging to the CSG-ID.
  • white list management the relationship between a mobile terminal and a CSG-ID is managed (added, deleted, updated, searched). For example, one or a plurality of CSG-IDs registered by a certain mobile terminal as a user may be stored in the white list. Management related to these CSGs may be performed in other parts of the MME unit 73. A series of processing of the MME unit 73 is controlled by the control unit 1006. Therefore, although not shown in FIG. 10, the control unit 1006 is connected to the units 1001 to 1005.
  • the functions of MME currently being discussed in 3GPP are shown below (refer to Chapter 4.6.2 of Non-Patent Document 1).
  • the MME performs access control of one or a plurality of mobile terminals of CSG (Closed Subscriber Group).
  • CSG Cellular Subscriber Group
  • the MME accepts paging optimization as an option.
  • FIG. 11 is a block diagram showing a configuration of the HeNBGW 74 shown in FIG. 7 which is the HeNBGW according to the present invention.
  • the EPC communication unit 1101 performs data transmission / reception between the HeNBGW 74 and the MME unit 73 through the S1 interface.
  • the base station communication unit 1102 performs data transmission / reception between the HeNBGW 74 and the Home-eNB 72-2 via the S1 interface.
  • the location processing unit 1103 performs a process of transmitting registration information and the like among the data from the MME unit 73 delivered via the EPC communication unit 1101 to the plurality of Home-eNBs 72-2.
  • the data processed by the location processing unit 1103 is passed to the base station communication unit 1102 and transmitted to one or more Home-eNBs 72-2 via the S1 interface.
  • Data that does not require processing in the location processing unit 1103 and is simply passed (transmitted) is passed from the EPC communication unit 1101 to the base station communication unit 1102 and sent to one or more Home-eNBs 72-2 via the S1 interface. Sent.
  • a series of processing of the HeNBGW 74 is controlled by the control unit 1104. Therefore, although not shown in FIG. 11, the control unit 1104 is connected to the units 1101 to 1103.
  • HeNBGW74 The functions of HeNBGW74 currently being discussed in 3GPP are shown below (see Non-Patent Document 1, Chapter 4.6.2).
  • the HeNBGW 74 relays for the S1 application. Although part of the procedure of the MME unit 73 to the Home-eNB 72-2, the HeNBGW 74 terminates the S1 application not related to the mobile terminal 71.
  • the HeNBGW 74 When the HeNBGW 74 is arranged, procedures unrelated to the mobile terminal 71 are communicated between the Home-eNB 72-2 and the HeNBGW 74, and between the HeNBGW 74 and the MME unit 73.
  • the X2 interface is not set between the HeNBGW 74 and other nodes.
  • the HeNBGW 74 recognizes execution of paging optimization (Paging optimization) as an option.
  • Paging optimization paging optimization
  • FIG. 12 is a flowchart showing an outline from a cell search to a standby operation performed by a mobile terminal (UE) in an LTE communication system.
  • the mobile terminal uses the first synchronization signal (P-SS) and the second synchronization signal (S-SS) transmitted from the neighboring base stations in step ST1201, and the slot timing, frame Synchronize timing.
  • the synchronization signal (SS) is assigned a synchronization code corresponding to one-to-one PCI (Physical Cell Identity) assigned to each cell.
  • PCI Physical Cell Identity
  • a reference signal RS Reference signal
  • the reference signal RS uses a code corresponding to the PCI one-to-one, and can be separated from other cells by taking a correlation with the code.
  • step ST1203 the cell having the best RS reception quality, for example, the cell having the highest RS reception power, that is, the best cell is selected from one or more cells detected up to step ST1202.
  • the PBCH of the best cell is received and the BCCH that is broadcast information is obtained.
  • MIB Master Information Block
  • the MIB information includes, for example, DL (downlink) system bandwidth (also called transmission bandwidth setting (transmission bandwidth configuration: dl-bandwidth)), the number of transmission antennas, SFN (System frame number), and the like.
  • SIB1 System Information Block 1 in the broadcast information BCCH.
  • SIB1 includes information related to access to the cell, information related to cell selection, and scheduling information of other SIBs (SIBk; an integer of k ⁇ 2). Also, SIB1 includes TAC (Tracking Area Code).
  • step ST1206 the mobile terminal compares the TAC of SIB1 received in step ST1205 with the TAC already held by the mobile terminal. If the result of the comparison is the same, a standby operation is started in the cell. If they are different from each other, the mobile terminal requests a change of TA to perform TAU (Tracking Area Update) to the core network (Core-Network, EPC) (including MME) through the cell.
  • the core network updates the TA based on the identification number (UE-ID or the like) of the mobile terminal sent from the mobile terminal together with the TAU request signal. After updating the TA, the core network transmits a TAU receipt signal to the mobile terminal.
  • the mobile terminal rewrites (updates) the TAC (or TAC list) held by the mobile terminal with the TAC of the cell. Thereafter, the mobile terminal enters a standby operation in the cell.
  • CSG Cell Subscriber Group
  • access is permitted only to one or a plurality of mobile terminals registered in the CSG cell.
  • a CSG cell and one or more registered mobile terminals constitute one CSG.
  • a CSG configured in this way is given a unique identification number called CSG-ID.
  • a single CSG may have a plurality of CSG cells. If a mobile terminal registers in any one CSG cell, it can access another CSG cell to which the CSG cell belongs.
  • Home-eNB in LTE and Home-NB in UMTS may be used as CSG cells.
  • the mobile terminal registered in the CSG cell has a white list.
  • the white list is stored in SIM (Subscriber Identity Module) / USIM.
  • the white list stores CSG information of CSG cells registered by the mobile terminal.
  • CSG-ID, TAI (Tracking Area Identity), TAC, etc. can be considered as the CSG information.
  • Either of the CSG-ID and the TAC may be used as long as they are associated with each other.
  • GCI may be used as long as CSG-ID and TAC are associated with GCI (Global Cell Identity).
  • a mobile terminal that does not have a white list cannot access a CSG cell, and only accesses a non-CSG cell. Can not.
  • a mobile terminal having a white list can access both a CSG cell of a registered CSG-ID and a non-CSG cell.
  • Non-Patent Document 5 discloses a basic operation of a mobile terminal using PCI split.
  • a mobile terminal that does not have PCI split information needs to perform cell search using all PCIs, for example, using all 504 codes.
  • a mobile terminal having PCI split information can perform a cell search using the PCI split information.
  • PCI for hybrid cells is not included in the PCI range for CSG cells (see Non-Patent Document 1, Chapter 10.7).
  • the HeNB and HNB are required to support various services. For example, an operator increases a radio resource that can be used by a mobile terminal by allowing the mobile terminal to be registered in a certain HeNB and HNB and allowing only the registered mobile terminal to access the HeNB and HNB cells. To enable high-speed communication. Accordingly, the service is such that the operator sets the charging fee higher than usual.
  • CSG cell Cell
  • CSG cells Cell Subscriber Group ⁇ ⁇ ⁇ cell
  • a CSG cell is installed for each store in a shopping street, each room in a condominium, each classroom in a school, and each section in a company, and only a user registered in each CSG cell can use the CSG cell.
  • HeNB / HNB is required not only to complement communication outside the coverage of the macro cell, but also to support various services as described above. For this reason, a case where the HeNB / HNB is installed in the coverage of the macro cell may occur.
  • Heterogeneous networks was added as one of the technologies to be studied in LTE-A.
  • a low output power local area range such as a pico eNB (pico cell), a node for a hot zone cell, a HeNB / HNB / CSG cell, a relay node, a remote radio head (RRH) range) network nodes (local area range node (local area node), local area node (local area node), local node (local node)). Therefore, it is required to operate a network in which one or more such local area range nodes are incorporated in a normal eNB (macro cell).
  • a network in which one or more local area range nodes are incorporated in a normal eNB (macro cell) is called heterogeneous networks, and an interference reduction method, a capacity improvement method, and the like are studied.
  • a base station or cell adopted as a capacity booster monitors the traffic load and switches off if the traffic stays below a certain threshold for a certain period of time. Yes (see Non-Patent Document 8).
  • the base station can request the base station switched off to switch on (see Non-Patent Document 8).
  • a base station that can be switched off is a cell that provides basic coverage and basic capacity (see Non-Patent Document 9).
  • Non-Patent Document 8 considers a cell that provides basic coverage and basic capacity. Cells that provide basic coverage and basic capacity are considered wide-area eNBs (see Non-Patent Document 10). From this, it can be considered that the network node in the local area range is not considered in the technique disclosed in Non-Patent Document 8.
  • a network node in the local area range is referred to as a local eNB (Local eNB).
  • a normal eNB macro cell
  • the local eNB has a relatively small output power.
  • a wide area eNB for example, a normal eNB (macro cell), has a relatively large output power. In other words, the output power of the local eNB is smaller than the output power of the wide area eNB.
  • Non-Patent Document 8 stipulates that power consumption can be reduced using the X2 interface.
  • the HeNB which is one of the local eNBs, does not support the X2 interface (see non-patent document 1, chapter 4.6.1). Therefore, in HeNB, reduction of power consumption cannot be realized by the method disclosed in Non-Patent Document 8.
  • Non-Patent Document 8 has a problem that low power consumption cannot be realized in a network node in the local area range.
  • Patent Document 1 The technology relating to low power consumption in the network node in the local area range is disclosed in the above-mentioned Patent Document 1.
  • the base station in a wireless communication system including a femto base station such as a Home-eNB, the base station is connected to the base station from the network side according to the location status of the mobile terminal in the cell formed by the base station.
  • the radio signal output of the femto base station is stopped or started. In this way, when the radio signal output of the femto base station is controlled by an instruction from the network side, the load on the network side increases.
  • the radio signal output of the femto base station is controlled according to the location status of the mobile terminal, but due to factors other than the location status of the mobile terminal, the femto base Sometimes it is better to restrict the operation of network nodes such as stations.
  • the HeNB cannot operate normally. In this case, even if the power supply of the HeNB is turned on (On), communication with the UE is not normally performed. Therefore, if the power supply of the HeNB is turned on, power consumption is wasted. .
  • Patent Document 1 The technology for solving this problem is not disclosed in Patent Document 1. As described above, the conventional technology cannot efficiently reduce the power consumption of the network node in the local area range.
  • the solution in the first embodiment for solving the above problem is shown below.
  • the HeNB when the connection between the HeNB and the backhaul is disconnected, the HeNB is shifted from a normal operation to an operation for reducing power consumption.
  • the operation for reducing power consumption is referred to as a low power operation or an energy saving operation, and this operation state is referred to as a low power operation state.
  • the normal operation is referred to as a normal operation or a normal operation, and this operation state is referred to as a normal operation state.
  • FIG. 13 is a block diagram showing a configuration of mobile communication system 600 according to Embodiment 1 of the present invention.
  • the mobile communication system 600 has a configuration in which transmission / reception is turned off (OFF) and wired-side intermittent operation is realized as a configuration of the energy saving operation of the HeNB 606.
  • “Transmission / reception off” means that the HeNB 606 stops the transmission operation of the downlink transmission signal that is a signal to be transmitted to the UE and the reception operation of the uplink transmission signal that is a signal transmitted from the UE.
  • the mobile communication system 600 includes an EPC 601 that is a core network including MME (Mobility Management Entity) and S-GW (Serving Gateway), HeNB-GW (Gateway) 602, and BB (Broadband) access network (hereinafter referred to as “IP ( Internet Protocol) ”) 603) and a femto base station apparatus 604.
  • the femto base station apparatus 604 includes an optical line termination apparatus 605 and a HeNB 606.
  • the optical line termination device 605 may not exist in the femto base station device 604. In this case, the femto base station apparatus 604 may be referred to as HeNB.
  • the EPC 601 has the same configuration as the MME unit 73 shown in FIGS. 7 and 10 described above.
  • the HeNB-GW 602 has the same configuration as the HeNBGW 74 shown in FIGS. 7 and 11 described above.
  • the HeNB 606 has the same configuration as the base station 72 shown in FIGS. 7 and 9 described above.
  • the EPC 601 is connected to the HeNB-GW 602.
  • the HeNB-GW 602 connects the EPC 601 and the femto base station apparatus 604 via the IP network 603.
  • the HeNB-GW 602 is not used in the LTE mobile communication system currently being discussed in 3GPP. This embodiment is applicable even when the HeNB-GW 602 does not exist.
  • the femto base station device 604 is installed in a home, for example.
  • the HeNB 606 of the femto base station apparatus 604 is connected to the IP network 603 via the optical line termination apparatus 605. In this way, the HeNB 606 is connected to the EPC 601 so that wired communication is possible.
  • the mobile communication system 600 is configured to be able to detect whether or not the connection between the HeNB 606 and the backhaul has been disconnected.
  • “backhaul” refers to a transmission path from the base station to the core network.
  • a transmission path from HeNB 606 as a base station to EPC 601 as a core network specifically, an optical line termination unit 605a, IP network 603 and HeNB-GW 602, and a line connecting them are provided. This is called “backhaul”.
  • the backhaul corresponds to a connection device, and connects the HeNB 606 and the EPC 601 so that wired communication is possible.
  • the optical line termination device 605 includes an optical line termination unit 605a and a connection disconnection detection unit 605b.
  • the connection disconnection detection unit 605b detects whether or not the connection between the HeNB 606 and the backhaul has been disconnected.
  • the connection disconnection detection unit 605b corresponds to connection disconnection detection means.
  • the optical line termination unit 605a is connected to the HeNB 606.
  • the optical line termination device 605 is connected to the HeNB 606 by the optical line termination unit 605a.
  • the disconnection detection unit 605b may be included in the HeNB 606 instead of the optical line termination device 605.
  • connection disconnection detection unit 605b detects that the connection with the backhaul has been disconnected.
  • the connection disconnection detection unit 605b transmits the control signal to the HeNB 606 to shift the HeNB 606 from the normal operation to the energy saving operation.
  • the energy saving operation transmission / reception is turned off (OFF) and the wire side intermittent operation is performed.
  • the transmission / reception operation with the UE is turned off, and the communication with the HeNB-GW 602 via the wired side, that is, the IP network 603 and the optical line termination device 605 is set as an intermittent operation.
  • the supply of the clock signal to the modulation unit may be stopped, or the supply of power to the transmission amplifier may be stopped.
  • connection disconnection detection unit 605b determines that the connection with the backhaul has been disconnected.
  • data user data, control data
  • control signals notified from the disconnection detection unit 605b to the HeNB 606 are disclosed below.
  • connection disconnection detection unit 605b detects that the connection with the backhaul has been recovered.
  • the connection disconnection detection unit 605b transmits a control signal to the HeNB 606, and shifts the HeNB 606 from the energy saving operation to the normal operation.
  • shifting to the normal operation the transmission / reception operation with the UE is turned on, and the wired side is set to the continuous operation.
  • the supply of the clock signal to the modulation unit is stopped, the supply of the clock signal is resumed. If the supply of power to the transmission amplifier has been stopped, the supply of power is resumed.
  • connection disconnection detection unit 605b receives a response signal from the HeNB-GW 602 or the EPC 601, the connection disconnection detection unit 605b determines that the connection with the backhaul has been recovered.
  • the connection disconnection detection unit 605b receives data (user data, control data) from the HeNB-GW 602 or the EPC 601, the connection disconnection detection unit 605b determines that the connection with the backhaul has been recovered.
  • control signals notified from the disconnection detection unit 605b to the HeNB 606 are disclosed below.
  • the HeNB 606 when the connection with the backhaul of HeNB 606 is disconnected and the base station cannot operate, the HeNB 606 is made to perform an energy saving operation. As a result, the power consumption can be reduced as compared with the case where the HeNB 606, which cannot operate as a base station, performs the normal operation. Therefore, it is possible to efficiently reduce power consumption in the HeNB 606 that is a network node in the local area range.
  • FIG. A problem to be solved in the second embodiment will be described.
  • the throughput also deteriorates on the UE side. If the throughput is improved by connecting to a neighboring eNB, there may be no merit of connecting to the HeNB.
  • the line quality of the HeNB backhaul deteriorates, if the normal operation of the HeNB is continued, there is a problem that the throughput on the UE side deteriorates.
  • FIG. 14 is a block diagram showing a configuration of HeNB 1200 according to the second embodiment of the present invention.
  • the HeNB 1200 has a function of measuring the line quality of the backhaul.
  • the HeNB 1200 includes an EPC communication unit 1201, another base station communication unit 1202, a protocol communication unit 1203, a transmission data buffer unit 1204, an encoder unit 1205, a modulation unit 1206, a frequency conversion unit 1207, an antenna 1208, a demodulation unit 1209, a decoder unit 1210, A control unit 1211 and a line quality measurement unit 1212 are provided.
  • the control unit 1211 and the line quality measurement unit 1212 correspond to a line quality comparison unit.
  • the X2 interface between HeNBs is not supported. However, since it is considered that the X2 interface between the HeNBs is supported depending on the future discussion, the other base station communication unit 1202 (X2 interface) will also be described in the present embodiment and FIG.
  • the EPC communication unit 1201 transmits and receives data to and from an EPC that is a core network that integrally accommodates access networks such as LTE, 3G, and wireless LAN.
  • the control unit 1211 performs setting of each block configuring the HeNB 1200 and the like.
  • EPC communication unit 1201, other base station communication unit 1202, protocol communication unit 1203, transmission data buffer unit 1204, encoder unit 1205, modulation unit 1206, frequency conversion unit 1207, antenna 1208, demodulation unit 1209, decoder unit 1210 and control unit 1211 Are respectively the EPC communication unit 901, the other base station communication unit 902, the protocol communication unit 903, the transmission data buffer unit 904, the encoder unit 905, the modulation unit 906, the frequency conversion unit 907, of the base station 72 shown in FIG.
  • the antenna 908, the demodulation unit 909, the decoder unit 910, and the control unit 911 have the same configuration.
  • EPC communication unit 1201 and protocol processing unit 1203 are connected via line quality measurement unit 1212. Further, the other base station communication unit 1202 and the protocol processing unit 1203 are connected via a line quality measurement unit 1212.
  • the HeNB 1200 compares the channel quality of the own HeNB 1200 with the channel quality of other base stations. When it is determined that the channel quality of another base station is better, the HeNB 1200 operates such that a UE being served by the own cell is connected to another base station.
  • a radio signal from a UE being served thereby is received by antenna 1208, and is provided to frequency conversion section 1207 as a received signal.
  • the received signal is converted into a baseband signal by the frequency conversion unit 1207, and detection processing and demodulation processing are performed by the demodulation unit 1209.
  • the demodulated data is given to the decoder unit 1210 and decoded by performing a decoding process such as error correction.
  • control data and call control information are provided to the EPC communication unit 1201 and the protocol processing unit 1203.
  • quality measurement information is given from the EPC communication unit 1201 and the protocol processing unit 1203 to the line quality measurement unit 1212.
  • the channel quality measurement unit 1212 is based on the quality measurement information given from the EPC communication unit 1201 and the protocol processing unit 1203, and is the radio channel quality that is the transmission quality of the radio channel between the HeNB 1200 and the UE, that is, between the HeNB 1200 and the UE. Measure the quality of the radio link established between them.
  • the radio channel quality may be directly measured by the channel quality measuring unit 1212.
  • the demodulating unit 1209 and the decoder unit 1210 measure the channel quality, and the information is transmitted to the channel quality via the protocol processing unit 1203 and the EPC communication unit 1201.
  • the line quality measurement unit 1212 may obtain the line quality.
  • Examples of the wireless channel quality in the wireless section include a reception level and a signal-to-interference ratio (SIR).
  • radio channel quality of another base station a specific example of a method for acquiring radio channel quality (hereinafter sometimes referred to as “radio channel quality of another base station”) between another base station and a UE being served by another base station is disclosed below.
  • information on the radio channel quality of other base stations is received by the channel quality measurement unit 1212 via the other base station communication unit 1202 or the EPC communication unit 1201.
  • the information on the radio channel quality of other base stations is the radio channel quality that is the transmission quality of radio channels between other base stations and UEs being served by other base stations, that is, between other base stations and UEs.
  • Represents the quality of the other wireless link that is the wireless link established by Reception of radio channel quality information of other base stations in the HeNB 1200 of this specific example is achieved by a base station realized by the HeNB 1200 in which a certain UE includes an antenna 1208, a frequency conversion unit 1207, a demodulation unit 1209, and a decoder unit 1210. It is effective when connected to both the base station and another base station that performs communication via the other base station communication unit 1202. This is because channel quality in actual UEs can be compared.
  • the channel quality measurement unit 1212 establishes a radio channel with higher quality, that is, a radio channel with higher quality among the radio channel between the HeNB 1200 and the UE as the own device and the radio channel with another base station and the UE. It is determined that communication should be performed with a base station that is currently operating, specifically, a base station with high channel quality. Examples of wireless channel quality in the wireless section include reception level and SIR.
  • the control unit 1211 controls the operation of the HeNB 1200 based on the determination of the channel quality measurement unit 1212. Specifically, when the channel quality measurement unit 1212 determines that the quality of the radio channel between the other base station and the UE is higher and determines that communication with the other base station should be performed, the control is performed.
  • the unit 1211 stops the input of the clock signal to the modulation unit 1206 or the demodulation unit 1209 on the HeNB 1200 side as its own device, or stops the power supply to the transmission amplifier connected to the antenna 1208 Perform the action.
  • the transmission data buffer unit 1204 and the decoder unit 1210 which are backhaul side interface (I / F) units are operated as they are. That is, in the present embodiment, as the energy saving operation of the HeNB 1200, transmission / reception is turned off (OFF) and the backhaul side I / F unit is turned on.
  • the EPC communication unit 1201 or the line quality measuring unit 1212 measures the line quality of the backhaul.
  • the EPC communication unit 1201 or the channel quality measurement unit 1212 of another base station measures the channel quality of the backhaul.
  • the channel quality measurement unit 1212 of the own HeNB 1200 receives the measurement result via the other base station communication unit 1202 or the EPC communication unit 1201.
  • the channel quality measurement unit 1212 has established a radio channel having higher quality, that is, a higher quality radio channel, among the backhaul channel of the HeNB 1200 as its own device and the backhaul channel of another base station. It is determined that communication should be performed with a base station, specifically, a base station with high channel quality.
  • the line quality measurement unit 1212 When measuring the line quality on the wired side, the line quality measurement unit 1212 receives the Ethernet frame discard rate (from the protocol check unit 1203 and the EPC communication unit 1201 based on the frame check result of the Ethernet (registered trademark) frame ( Hereinafter, it may be referred to as “frame discard rate”), and the time during which the rate control setting between the HeNB 1200 as its own device and the network in another base station remains at a low rate (hereinafter referred to as “low rate duration”). Is obtained as the line quality on the wired side. Then, the line quality measurement unit 1212 makes a determination based on the frame discard rate and the low rate duration.
  • frame discard rate the time during which the rate control setting between the HeNB 1200 as its own device and the network in another base station remains at a low rate
  • the channel quality measurement unit 1212 determines that communication should be performed with a base station with a lower frame discard rate, that is, another base station. .
  • the channel quality measurement unit 1212 determines that communication should be performed with the base station with the longer low rate duration, that is, another base station.
  • the own HeNB is shifted to the energy saving operation.
  • the own HeNB is prevented from being selected by the UE from being selected as a handover destination.
  • the control unit 1211 transmits the modulation to the modulation unit 1206 or the demodulation unit 1209 so that the other base station communicates with the UE.
  • the energy saving operation such as stopping the input of the clock signal or stopping the supply of power to the transmission amplifier connected to the antenna 1208 is performed.
  • the transmission data buffer unit 1204 and the decoder unit 1210 as the I / F unit on the backhaul side are operated as they are.
  • reception quality (RSRP etc.) of HeNB1200 in UEs being served thereby decreases, and cell reselection or handover is executed.
  • the HeNB 1200 transmits information instructing not to include the own cell as a selection target as a cell selection destination or a handover destination. Broadcast information may be used for the transmission.
  • the mobile terminal in the coverage can be notified regardless of the state of the mobile terminal (UE) (standby or busy). As a result, it is possible to prevent further UE connections and the like while maintaining the connection of the UEs being served thereby.
  • the line quality measurement unit 1212 is provided on the HeNB 1200 side in the present embodiment, but may be provided on the core network side.
  • the line quality measurement unit 1212 is on the HeNB 1200 side as in the present embodiment, when the line quality measurement result determines that the line quality on the HeNB 1200 side is deteriorated, an alarm signal is output to the core network side and the backhaul is performed. Notify that the energy saving operation is performed due to quality deterioration.
  • the HeNB 1200 stops the input of the clock signal to the modulation unit 1206 or the demodulation unit 1209 or the power to the transmission amplifier connected to the antenna 1208 as described above. An energy saving operation such as stopping the supply is performed.
  • the transmission data buffer unit 1204 and the decoder unit 1210 as the I / F unit on the backhaul side are operated as they are. That is, as the energy saving operation of the HeNB 1200, transmission / reception is turned off (OFF) and the backhaul I / F unit is turned on.
  • a user when a user receives a disadvantage due to a decrease in backhaul quality and a decrease in throughput, for example, when a dedicated service of the HeNB 1200 cannot be received, an energy saving operation is performed in the HeNB 1200. To do. As a result, the UE used by the user can be prompted to communicate with another base station, so that the possibility of the user receiving a disadvantage can be reduced.
  • the HeNB 1200 is operated in a normal operation state when a higher-quality radio channel can be established with the UE than other base stations, and the radio with lower quality is used.
  • the line is established, the low power operation state is entered.
  • power consumption can be reduced. Therefore, low power consumption can be efficiently performed in the HeNB 1200 that is a network node in the local area range.
  • the HeNB 1200 when the HeNB 1200 detects the deterioration of the backhaul line quality toward the core network by the line quality measurement unit 1212, the HeNB 1200 notifies the core network side of the decrease in the backhaul line quality toward the core network. To do. As a result, the operator on the core network side can recognize that the HeNB 1200 is performing an energy saving operation due to an abnormality in the backhaul line. Further, the operator on the core network side notifies the UE being served by the HeNB 1200 that the energy saving operation due to the backhaul line abnormality is being performed, so that the user of the UE can also receive the energy saving due to the backhaul line abnormality. It can be recognized that it is an operation.
  • Embodiment 3 A problem to be solved in the third embodiment will be described.
  • the HeNB operates only for registered UEs, but the number of HeNBs accommodated is larger than the number of registered UEs (hereinafter referred to as “number of registered users”) (HeNB accommodation). Number> number of registered users), a circuit that does not operate is generated. Since power is also supplied to a circuit that does not operate in this way, there arises a problem that power consumption is wasted.
  • FIG.15 and FIG.16 is a block diagram which shows the structure of HeNB of Embodiment 3 of this invention.
  • FIG. 15 shows a configuration when the number of registered users is “4”
  • FIG. 16 shows a configuration when the number of registered users is “1”.
  • the HeNB when the number of registered users shown in FIG. 15 is “4” is indicated by reference numeral 700
  • the HeNB when the number of registered users shown in FIG. 16 is “1” is indicated by reference numeral 700A.
  • the HeNBs 700 and 700A are connected to an EPC 601 that is a core network including an MME and the like via a backhaul such as a HeNB-GW 602.
  • the HeNBs 700 and 700A of the present embodiment are configured to store UEs registered as users (hereinafter sometimes referred to as “registered UEs”). HeNB700, 700A acquires the information of UE registered into this HeNB700, 700A with the following methods. For example, when the UE registers the HeNBs 700 and 700A, specifically, when registering the CSG-ID of the HeNBs 700 and 700A, the MME notifies the HeNBs 700 and 700A of information on the UEs to be registered. Or you may notify by the owner of HeNB. Moreover, you may notify from UE registered. Thereby, HeNB700, 700A acquires the information of registration UE.
  • the MME sets the UE attribute in which the CSG-ID of the HeNB 700, 700A is registered in the HeNB 700, 700A, for example, the UE identifier (UE-ID; subscriber identifier (International Mobile Subscriber Identity: IMSI), etc.), the UE category. It is comprised so that it may notify and memorize
  • UE-ID UE-ID
  • subscriber identifier International Mobile Subscriber Identity: IMSI
  • the HeNBs 700 and 700A of the present embodiment constitute a service for acquiring UEs registered in the HeNBs 700 and 700A from the network (NW) side.
  • the HeNB 700 shown in FIG. 15 includes a rewritable device 701, a CPU (Central Processing Unit) 702, a user number registration memory 703, and a ROM (Read Only Member) 704.
  • a rewritable device 701 shown in FIG. 15 is a rewritable logic circuit device when the number of registered users is 4, and includes four user processing circuits 705.
  • the user processing circuit 705 processes a wireless communication operation with the UE.
  • the CPU 702 comprehensively controls the rewritable device 701, the user number registration memory 703, and the ROM 704.
  • the user number registration memory 703 stores the number of registered users.
  • the ROM 704 stores logic circuit binary data having circuit information up to the maximum capacity.
  • a HeNB 700A shown in FIG. 16 includes a rewritable device 701A, a CPU 702, a user number registration memory 703, and a ROM 704.
  • the structure other than rewritable device 701A is the same as that of HeNB700 shown in FIG.
  • a rewritable device 701A illustrated in FIG. 16 is a rewritable logic circuit device when the number of registered users is 1, and includes one user processing circuit 705.
  • the CPU 702 comprehensively controls the rewritable device 701A, the user number registration memory 703, and the ROM 704.
  • the rewritable devices 701 and 701A of the HeNBs 700 and 700A correspond to processing means.
  • the rewritable devices 701 and 701A are realized by FPGA (Field Programmable Gate Array) or the like.
  • the HeNBs 700 and 700A statically change the circuit configuration of the rewritable devices 701 and 701A according to the number of registered users (hereinafter may be referred to as “the number of UEs”), and the accommodated number of HeNBs 700 and 700A is equal to or less than the number of registered users. (HeNB accommodation number ⁇ registered user number).
  • the HeNBs 700 and 700A of the present embodiment operate as follows.
  • the ROM 704 stores logic circuit binary data having circuit information up to 1, 2,...
  • the CPU 702 starts an activation operation. Specifically, the CPU 702 reads the number of registered users from the user number registration memory 703, reads the logic circuit binary data corresponding to the corresponding number of registered users from the ROM 704, and develops the rewritable devices 701 and 701 ⁇ / b> A.
  • the CPU 702 corresponds to a rewriting unit.
  • the rewritable devices 701 and 701A are in a state where only the user processing circuits 705 corresponding to the number of registered users exist and there are no non-operating circuits. For example, when the number of registered users is “4”, as shown in FIG. 15, only four user processing circuits 705 exist, and no non-operational circuit exists. When the number of registered users is “1”, as shown in FIG. 16, there is only one user processing circuit 705 and no non-operating circuit.
  • the HeNBs 700 and 700A perform the above-described normal operation in a state where there are only circuits for the number of registered users.
  • the HeNBs 700 and 700A include the rewritable devices 701 and 701A, and the CPU 702 develops logic circuit binary data corresponding to the number of registered users in the rewritable devices 701 and 701A. Specifically, the CPU 702 rewrites the user processing circuits 705 of the rewritable devices 701 and 701A so that the same number of user processing circuits 705 as the number of registered users are formed. As a result, when the number of registered users is small with respect to the number of UEs that can be accommodated in the HeNBs 700 and 700A, it is possible to limit the circuit to operate, so that the circuit configuration according to the number of registered users can be obtained.
  • the power consumption of the HeNBs 700 and 700A during normal operation can be reduced as compared with the case where the same number of user processing circuits 705 as the number of UEs that can be accommodated is provided in advance. It is possible to efficiently reduce power consumption in the station apparatus.
  • the HeNBs 700 and 700A are configured to be able to switch between a normal operation and an energy saving operation. For example, in the following cases (1) to (3), the HeNBs 700 and 700A shift from the normal operation to the energy saving operation.
  • a UE connected to the HeNB 700, 700A does not exist for a predetermined period. Specifically, when there is no CONNECTED UE for a certain period under the HeNB 700, 700A, or when there is only an IDLE UE for a certain period under the HeNB 700, 700A.
  • the HeNBs 700 and 700A stop the transmission operation of the downlink transmission signal to the UE, for example, as the energy saving operation, and continue the reception operation of the uplink transmission signal from the UE. That is, the transmission operation is turned off and the reception operation is turned on.
  • the same method as the method for setting the transmission / reception operation to the off state in the first and second embodiments described above may be used. Specifically, the input of the clock signal to the modulation unit is stopped, or the supply of power to the transmission amplifier connected to the antenna is stopped.
  • the HeNBs 700 and 700A are in a state capable of receiving an uplink transmission signal transmitted from the UE.
  • the HeNBs 700 and 700A may perform a continuous reception operation in which the uplink transmission signal transmitted from the UE can be always received, but may perform an intermittent reception operation in which the uplink reception signal is intermittently received. Good.
  • the intermittent reception operation is effective in reducing power consumption compared to the continuous reception operation.
  • the HeNBs 700 and 700A shift from the energy saving operation to the normal operation.
  • the uplink transmission signal for wakeup refers to an uplink transmission signal transmitted from the UE in order to shift the HeNBs 700 and 700A from the energy saving operation to the normal operation.
  • the UE stores the UE identification number (UE-ID) in the wake-up uplink transmission signal and transmits it.
  • the MME is configured to have a function of notifying the HeNB 700 and 700A of the attribute of the registered UE and storing the attribute as described above, so the HeNB 700 and 700A stores the attribute of the registered UE. ing. Accordingly, when the uplink transmission setting for wakeup is changed from the setting A to the setting B, for example, the HeNBs 700 and 700A use the UE-ID when the wakeup uplink transmission signal is received from the UE in the state of the setting B. Thus, it can be recognized that the uplink transmission setting has been updated.
  • Embodiment 4 A problem to be solved in the fourth embodiment will be described.
  • the frequency bandwidth covered by the HeNB may be over-specification, that is, excessive.
  • processing is performed with a wide bandwidth, there arises a problem that power consumption is wasted.
  • FIG. 17 is a block diagram showing a configuration of HeNB 1300 according to Embodiment 4 of the present invention.
  • the HeNB 1300 of the present embodiment has the same configuration as the HeNB 1200 of the second embodiment shown in FIG. 14, and thus the corresponding parts are denoted by the same reference numerals and common description is omitted.
  • the HeNB 1300 includes an EPC communication unit 1201, another base station communication unit 1202, a protocol communication unit 1203, a transmission data buffer unit 1204, an encoder unit 1205, a modulation unit 1206, a frequency conversion unit 1207, an antenna 1208, and a demodulation unit 1209. , A decoder unit 1210, a control unit 1211, a band switching unit 1301, an RF (Radio Frequency) unit 1302, a registered UE attribute storage unit 1303, and an operating frequency switching unit 1304.
  • the RF unit 1302 corresponds to a radio unit and performs radio communication with the UE.
  • the HeNB 1300 is connected to the EPC 601 that is a core network including an MME and the like through a backhaul such as the HeNB-GW 602, like the HeNB 606 shown in FIG.
  • the RF unit 1302 includes a wideband-compatible RF circuit (hereinafter also referred to as “broadband RF circuit”) and a narrowband-compatible RF circuit (hereinafter also referred to as “narrowband RF circuit”).
  • the wideband RF circuit includes a wideband band limiting filter and an amplifier.
  • the narrowband RF circuit includes a narrowband band limiting filter and an amplifier. In FIG. 17, wideband and narrowband amplifiers are shown as representatives, but the number of amplifiers is not limited to two.
  • the band limiting filter limits a band for processing of the HeNB 1300 (hereinafter also referred to as “processing band”) to a predetermined band.
  • the wideband band limiting filter limits the processing band to a relatively wide band.
  • the band limiting filter for narrow band limits the processing band to a relatively narrow band.
  • the band switching unit 1301 switches the frequency band used by the RF unit 1302. Specifically, the band switching unit 1301 selects a band limiting filter of the RF unit 1302.
  • An RF circuit including a band limiting filter selected by the band switching unit 1301 is connected to the frequency conversion unit 1207 and the antenna 1208 to operate.
  • the broadband RF circuit is connected to the frequency converter 1207 and the antenna 1208, and the processing band of the HeNB 1300 is selected to be broadband.
  • the narrow band RF circuit is connected to the frequency converting unit 1207 and the antenna 1208, and the processing band of the HeNB 1300 is selected to be a narrow band.
  • the operating frequency switching unit 1304 switches the operating frequency of the HeNB 1300, that is, the clock frequency, according to the processing band of the HeNB 1300.
  • a relatively high-speed clock hereinafter may be referred to as “high-speed clock for broadband”
  • a low-speed clock hereinafter sometimes referred to as a “low-speed clock for narrow band”
  • the operating frequency switching unit 1304 switches between a broadband high-speed clock and a narrow-band low-speed clock.
  • the registered UE attribute storage unit 1303 stores registered UE information.
  • Information on the registered UE corresponds to mobile terminal information.
  • the information on the registered UE includes at least one of the number and attributes of UEs registered in the HeNB 1300. Examples of registered UE attributes include UE-ID and UE category.
  • the UE category defines UE performance.
  • the HeNB 1300 according to the present embodiment acquires UE information to be registered in the HeNB 1300 by the following method and the like, similar to the HeNB 700 and 700A according to the third embodiment shown in FIGS. 15 and 16 described above.
  • the MME when the UE registers the HeNB, specifically when registering the CSG-ID of the HeNB 1300, the MME notifies the HeNB 1300 of information on the UE to be registered. Or you may notify by the owner of HeNB. Moreover, you may notify from UE registered. Thereby, the HeNB 1300 acquires information on the registered UE.
  • the MME registers information of registered UEs in the HeNB 1300, specifically, the number of UEs in which the CSG-ID of the HeNB 1300 is registered, and UE attributes such as UE identifier (UE-ID; IMSI, etc.), UE category It is comprised so that it may notify and memorize
  • information on the intention of the HeNB owner may be stored.
  • owner's intention information is disclosed below.
  • Two specific examples of the owner's intention input method are disclosed below.
  • the HeNB 1300 is configured to be able to switch between a normal operation and an energy saving operation, similar to the HeNBs 700 and 700A shown in FIGS. 15 and 16 described above.
  • the UE stores the UE identification number (UE-ID) in the wake-up uplink transmission signal and transmits it.
  • UE-ID UE identification number
  • MME since MME is comprised so that it may have the function to notify and memorize
  • the HeNB 1300 receives the uplink from the UE-ID when the wakeup uplink transmission signal is received from the UE in the setting B state. It can be recognized that the transmission setting has been updated.
  • the HeNB 1300 operates as follows.
  • the control unit 1211 acquires information on the registered UE from the registered UE attribute storage unit 1303.
  • the control unit 1211 obtains a frequency band that the HeNB 1300 needs as a processing band based on the acquired information of the registered UE.
  • the control unit 1211 performs processing band selection by selecting a band limiting filter and an amplifier of the RF unit 1302 by the band switching unit 1301 according to the obtained frequency band.
  • the control unit 1211 switches the operating frequency by the operating frequency switching unit 1304 according to the frequency band obtained as the processing band.
  • the control unit 1211 reduces the operating frequency, that is, switches to a low-speed clock.
  • the processing band is narrow, the transmission rate is low, but the degree of the low-speed clock is selected so that the processing time is sufficient for the system even at the low transmission rate. By reducing the clock frequency, power consumption can be reduced.
  • the band switching unit 1301 selects a band-limiting filter and amplifier for narrow band.
  • the operating frequency switching unit 1304 selects a low-speed clock for narrow band.
  • the band switching unit 1301 selects a band limiting filter and an amplifier for wide band. Further, the operating frequency switching unit 1304 selects a broadband high-speed clock.
  • the band switching unit 1301 selects a band limiting filter and an amplifier for narrow band. .
  • the operating frequency switching unit 1304 selects a low-speed clock for narrow band.
  • the band switching unit 1301 selects a band limiting filter and an amplifier for broadband. Further, the operating frequency switching unit 1304 selects a broadband high-speed clock.
  • the band switching unit 1301 selects a narrow band band limiting filter and amplifier effective for low power consumption. Further, the operating frequency switching unit 1304 selects a low-speed clock for narrow band. On the other hand, if the information on the intention of the owner indicates that low power consumption is not prioritized, the band switching unit 1301 selects a band limiting filter and an amplifier for a wide band. Further, the operating frequency switching unit 1304 selects a broadband high-speed clock. Note that the owner can manually indicate low power consumption priority to the HeNB, or can automatically indicate low power consumption priority by time designation. In the case of manual operation, switching can be performed by transmitting a control signal from the external switch to the band switching unit 1301.
  • the band switching unit 1301 selects a band limiting filter and an amplifier for narrow band.
  • the operating frequency switching unit 1304 selects a low-speed clock for narrow band.
  • the band switching unit 1301 selects a band-limiting filter and amplifier for broadband. Further, the operating frequency switching unit 1304 selects a broadband high-speed clock.
  • the band switching unit 1301 selects a band-limiting filter and amplifier for narrow band effective for low power consumption.
  • the operating frequency switching unit 1304 selects a low-speed clock for narrow band.
  • the band switching unit 1301 selects a band limiting filter and an amplifier for a wide band. Further, the operating frequency switching unit 1304 selects a broadband high-speed clock.
  • the band switching unit 1301 selects a narrow band band limiting filter and amplifier effective for low power consumption.
  • the operating frequency switching unit 1304 selects a low-speed clock for narrow band.
  • the band switching unit 1301 selects a band limiting filter and an amplifier for a wide band. Further, the operating frequency switching unit 1304 selects a broadband high-speed clock.
  • the band switching unit 1301 selects a band-limiting filter and an amplifier for narrow band effective for low power consumption.
  • the operating frequency switching unit 1304 selects a low-speed clock for narrow band.
  • the band switching unit 1301 selects a band limiting filter and an amplifier for a wide band. Further, the operating frequency switching unit 1304 selects a broadband high-speed clock.
  • the band switching unit 1301 selects a band limiting filter and amplifier for narrow band effective for low power consumption.
  • the operating frequency switching unit 1304 selects a low-speed clock for narrow band.
  • the band switching unit 1301 selects a band-limiting filter and amplifier for broadband. Further, the operating frequency switching unit 1304 selects a broadband high-speed clock.
  • Information on the registered UE including the number of registered UEs in the specific example (1) and the category of the registered UE in the specific example (2), information on the intention of the owner of the HeNB in the specific examples (3) and (4) Information on whether or not there is data exchange with the higher-level device in the specific example (5), information on whether or not communication is performed between the HeNB and the UE in the specific example (7) for a certain period of time,
  • the information on whether or not the time zone in which the traffic is low in the example (8) corresponds to information determined by the base station device.
  • the higher-level devices in specific examples (5) and (6) correspond to base-station higher-level devices, and are specifically MME, HeNB-GW, and the like.
  • the low power consumption operation instruction from the host device in the specific example (6) corresponds to the instruction from the base station host device.
  • modulation section 1206, demodulation section 1209, encoder section 1205, and decoder section 1210 constitute a baseband signal processing section.
  • Each unit constituting the baseband signal processing unit that is, the modulation unit 1206, the demodulation unit 1209, the encoder unit 1205, and the decoder unit 1210 is set as a synchronous circuit that supplies the same clock.
  • the clock signal can be supplied from the clock transmitter in a unified manner, so that the respective parts constituting the baseband signal processing unit can operate in synchronism even when the clock frequency is changed.
  • the system timing counter inside the device is a circuit using an enable signal or the like so that the counter change period should not change for those specified in 3GPP etc. so that it will not change even if the clock frequency changes. deep. Changes in the timing relationship with the host device are absorbed by the transmission data buffer unit 1204 on the transmission side.
  • the registered UE attribute storage unit 1303 stores the number of UEs registered in the HeNB 1300 and the UE category. From these pieces of information, the control unit 1211 obtains a frequency band that the HeNB 1300 needs as a processing band, selects a band limiting filter of the RF unit 1302 by the band switching unit 1213 according to the obtained frequency band, An RF circuit or a narrowband RF circuit is selected. If the UE supports a narrow band and does not require a wide band, a narrow band RF circuit is selected. Thereby, power consumption can be reduced.
  • the power consumption of the HeNB 1300 can be reduced. Therefore, low power consumption can be efficiently performed in the HeNB 1300 that is a network node in the local area range.
  • the frequency band required as the processing band is switched.
  • the frequency band used as a processing band is switched to limit the frequency band used in the radio unit according to the information determined by the base station apparatus.
  • the operation of the unit can be restricted and the power consumption can be reduced.
  • the radio unit limits the frequency band used in the radio unit according to the instruction from the base station host apparatus. The operation can be limited and the power consumption can be reduced. Therefore, in any case, it is possible to efficiently reduce the power consumption in the base station apparatus which is a network node in the local area range.
  • the amplifiers may be independent from each other. That is, it is possible to select a wideband band limiting filter and amplifier or a narrowband band limiting filter and amplifier by the control signal without changing the clock speed.
  • FIG. 18 is a diagram showing frequency scheduling.
  • squares ( ⁇ ) indicated by diagonal lines represent a cluster of frequencies such as resource blocks.
  • FIGS. 19 and 20 show subcarriers in which the hatched squares shown in FIG. 18 are drawn as one subcarrier.
  • FIG. 19 is a diagram illustrating an example of one subcarrier
  • FIG. 20 is a diagram illustrating subcarriers constituting a frequency band.
  • a hatched portion is a portion that may cause interference when the orthogonality is lost due to the state of the wireless transmission path. As shown in FIG. 19, there is a possibility that the orthogonality may be lost between adjacent subcarriers due to transmission path conditions, causing interference.
  • FIG. 21 is a diagram showing frequency scheduling and subcarriers in the case of using the band limiting method that eliminates one of the two bands A and B shown in FIG.
  • FIG. 22 is a diagram showing frequency scheduling and subcarriers when the method of reducing the bandwidths of the two bands A and B shown in FIG. 18 is used.
  • FIGS. 21A and 22A show frequency scheduling
  • FIGS. 21B and 22B show subcarriers.
  • a cluster of frequencies that does not actually exist is indicated by a broken-line square ( ⁇ ).
  • ⁇ broken-line square
  • FIG. 21 (b) and FIG. 22 (b) subcarriers that do not actually exist are indicated by broken lines.
  • a hatched portion is a portion that may cause interference when the orthogonality is lost due to the state of the wireless transmission path.
  • the method used in FIG. 21 and FIG. 22 is a band limiting method that keeps adjacent bands together, and when the orthogonality of subcarriers between adjacent frequencies collapses due to problems such as distortion of the wireless transmission path.
  • the problem of causing intersubcarrier interference remains as it is.
  • FIGS. 21 (b) and 22 (b) there is a possibility that the orthogonality may be lost between adjacent subcarriers due to transmission path conditions, causing interference.
  • FIG. 23 is a diagram showing frequency scheduling and subcarriers in the case of using a band limiting method that eliminates data transmission alternately for each subcarrier.
  • FIG. 23A shows frequency scheduling
  • FIG. 23B shows subcarriers.
  • a cluster of frequencies that do not actually exist is indicated by a broken-line square ( ⁇ ).
  • ⁇ broken-line square
  • FIG. 23B subcarriers that do not actually exist are indicated by broken lines.
  • a hatched portion is a portion that may cause interference when the orthogonality is lost due to the state of the wireless transmission path.
  • interference between subcarriers can be reduced by performing decimation so that adjacent subcarriers are not transmitted.
  • the transmission power can be kept small, leading to power saving.
  • subcarrier interference can be reduced and transmission power can be reduced. As a result, an effect of reducing power consumption can be obtained.
  • the LTE system (E-UTRAN) has been mainly described.
  • the mobile communication system of the present invention is applicable to LTE-Advanced (LTE-Advanced) and W-CDMA systems (UTRAN, UMTS). Applicable.
  • the HeNB is mainly described.
  • the present invention can be similarly applied to a micro cell (micro cell), a pico cell (pico cell), and a relay node (relay node).
  • 600 mobile communication system 601 EPC, 602 HeNB-GW, 603 BB access network (IP network), 604 femto base station device, 605 optical line terminator, 605a optical line terminator, 605b disconnection detector, 606,700 , 700A, 1200, 1300 HeNB, 701, 701A rewritable device, 702 CPU, 703 user number registration memory, 704 ROM, 705 user processing circuit, 1212 line quality measurement unit, 1301 band switching unit, 1302 RF unit, 1303 registration UE Attribute storage unit, 1304 operating frequency switching unit.
  • IP network IP network
  • 604 femto base station device 605 optical line terminator, 605a optical line terminator, 605b disconnection detector, 606,700 , 700A, 1200, 1300 HeNB, 701, 701A rewritable device, 702 CPU, 703 user number registration memory, 704 ROM, 705 user processing circuit, 1212 line quality measurement unit, 1301 band switching unit, 1302

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

Dans un système de communication d'unité mobile de l'invention, la consommation d'énergie dans un noeud de réseau dans une plage de zone locale peut être réduite efficacement. Par exemple, une unité de terminaison de ligne optique (605) d'un dispositif de femto-station de base (604) est pourvue d'une unité de détection de déconnexion (605b). L'unité de détection de déconnexion (605b) détecte si, oui ou non, une liaison, par exemple, une unité de terminaison de ligne optique (605a) qui connecte un HeNB (606) et un EPC (601), et le HeNB (606) sont déconnectés. Lorsque l'unité de détection de déconnexion (605b) détecte la déconnexion entre le HeNB (606) et l'unité de terminaison de ligne optique (605a), par exemple, du fait de la défaillance de l'unité de terminaison de ligne optique (605a), le HeNB (606) est mis dans un fonctionnement à économie d'énergie.
PCT/JP2011/060258 2010-04-30 2011-04-27 Système de communication d'unité mobile WO2011136267A1 (fr)

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WO2016067505A1 (fr) * 2014-10-28 2016-05-06 パナソニックＩｐマネジメント株式会社 Procédé de communication sans fil et dispositif de communication sans fil
WO2017028425A1 (fr) * 2015-08-18 2017-02-23 小米科技有限责任公司 Procédé et dispositif d'activation de mode d'économie d'énergie
CN113613297A (zh) * 2015-11-04 2021-11-05 三菱电机株式会社 通信系统
CN113613296A (zh) * 2015-11-04 2021-11-05 三菱电机株式会社 通信系统
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