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WO2011125640A1 - Système de communication sans fil, station de base, station mobile et procédé de communication - Google Patents

Système de communication sans fil, station de base, station mobile et procédé de communication Download PDF

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Publication number
WO2011125640A1
WO2011125640A1 PCT/JP2011/057760 JP2011057760W WO2011125640A1 WO 2011125640 A1 WO2011125640 A1 WO 2011125640A1 JP 2011057760 W JP2011057760 W JP 2011057760W WO 2011125640 A1 WO2011125640 A1 WO 2011125640A1
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WIPO (PCT)
Prior art keywords
cell
mobile station
station apparatus
power saving
identifier
Prior art date
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PCT/JP2011/057760
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English (en)
Japanese (ja)
Inventor
坪井秀和
上村克成
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Sharp Corp
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Sharp Corp
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. Transmission Power Control [TPC] 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
    • H04W52/00—Power management, e.g. Transmission Power Control [TPC] or power classes
    • H04W52/02—Power saving arrangements
    • H04W52/0209—Power saving arrangements in terminal devices
    • H04W52/0225—Power saving arrangements in terminal devices using monitoring of external events, e.g. the presence of a signal
    • H04W52/0229—Power saving arrangements in terminal devices using monitoring of external events, e.g. the presence of a signal where the received signal is a wanted signal
    • H04W52/0235—Power saving arrangements in terminal devices using monitoring of external events, e.g. the presence of a signal where the received signal is a wanted signal where the received signal is a power saving command
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W48/00—Access restriction; Network selection; Access point selection
    • H04W48/08—Access restriction or access information delivery, e.g. discovery data delivery
    • H04W48/12—Access restriction or access information delivery, e.g. discovery data delivery using downlink control channel
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W48/00—Access restriction; Network selection; Access point selection
    • H04W48/18—Selecting a network or a communication service
    • 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 radio communication system, a base station apparatus, a mobile station apparatus, and a communication method, and more particularly to a detection method for a base station apparatus.
  • 3GPP 3rd Generation Partnership Project
  • 3GPP which is a standardization project, has evolved to realize high-speed communication by adopting OFDM (Orthogonal Frequency Frequency Division) Multiplexing (OFDM) communication method and flexible scheduling in predetermined frequency and time units called resource blocks called resource blocks
  • OFDM Orthogonal Frequency Frequency Division
  • E-UTRA Universal Terrestrial Radio Access
  • the 3rd generation home base station apparatus defined by 3GPP is called Home Node B (Home NodeB). Further, the home base station apparatus in E-UTRA and Advanced E-UTRA is referred to as Home eNodeB (Home NodeB).
  • the home base station apparatus manages an area (cell) that can communicate with the mobile station apparatus, and the cell is referred to as a home cell.
  • the home cell is also referred to as a femto cell or a pico cell depending on the size of an area communicable with the mobile station apparatus.
  • the cell of the base station apparatus in communication is a serving cell, and the cell of the base station apparatus not in communication is referred to as a peripheral cell. That is, other cells included in the area of the serving cell are also referred to as neighboring cells.
  • the home cell of the home base station device that restricts the available users by registering accessible users in advance is referred to as a CSG (Closed Subscriber Group) cell.
  • the CSG cell transmits a CSG-ID (CSG Identity) to the mobile station apparatus by broadcast information, and the mobile station apparatus can access the cell by collating the CSG-ID with a CSG cell list held therein. It is judged whether it is (nonpatent literature 1).
  • the mobile station device In order to detect a CSG cell in which the mobile station device is registered, the mobile station device needs to acquire the identifier of the CSG cell and the broadcast information. In particular, a normal macro cell and a CSG cell are provided in different frequency bands. If it is, it is difficult to always perform the detection process from the viewpoint of power consumption. Therefore, E-UTRA has studied a mechanism for autonomously identifying that the mobile station apparatus is within the area of the registered CSG cell and performing detection processing only when the mobile station apparatus is within the area. Any method can be used as a method for detecting whether or not the mobile station device is within the area of the CSG cell. For example, GPS (Global Positioning System) can be used to specify a location or a plurality of surroundings.
  • GPS Global Positioning System
  • Non-Patent Document 2 A method of detecting based on a cell identifier (for example, a physical cell identifier or a cell global identifier) has been considered (Non-Patent Document 2).
  • a location service request is sent from the mobile station device to the network, and the network sends location measurement signals from a plurality of base station devices to the requested mobile station device.
  • a method for identifying the position of the mobile station apparatus using the support is also being studied (Non-patent Document 3).
  • the location of the own terminal can be specified from the MAC address of the AP included in the packet transmitted from the AP, using the association table of the MAC address and geographic information managed by the server on the network. .
  • Patent Document 1 presents a method that enables position specification by including latitude / longitude information in a part of the SSID broadcast from the AP.
  • 3GPP TS 22.220 ServiceSrequirements for Home NodeBs and Home eNodeBs. V9.3.0 (http://www.3gpp.org/ftp/Specs/html-info/22220.htm) Huawei, “Cell re-selection for hNB”, R2-074831, 3GPP TSG-RAN WG2 Meeting # 60, Jeju, South Korea, 5-9th November 2007 3GPP TS36.305, Stage 2 functional specification of User Equipment (UE) positioning in E-UTRAN.
  • UE User Equipment
  • the wireless LAN location specifying method and the method described in Patent Document 1 do not report the latitude / longitude information to the mobile station device in the current mobile phone system, and the cell size is Since it is larger than the size of the wireless LAN area, it is difficult to detect the area of the CSG cell using only a small number of cell identifiers, and the area detection accuracy can be improved using more cell identifiers. It is desirable to increase.
  • Non-Patent Document 4 This is a technique that is particularly useful for a cell having a small cell radius included in a macro cell having a large cell radius.
  • the mobile station apparatus that performs area identification based on the identifier of the neighboring cell, when a part of the neighboring cell is in the power saving state, A part of the identifier cannot be acquired, resulting in a problem that the area detection of the CSG cell fails.
  • an object of the present invention is to provide a radio communication system, a base station apparatus, a mobile station apparatus, and a communication method that allow a mobile station apparatus to efficiently perform area identification.
  • the present invention has taken the following measures. That is, the base station apparatus according to the present invention includes a transmission signal processing unit that generates a transmission signal including power saving information indicating whether or not there is a possibility of transition to a power saving state of the own station, and the generated transmission signal to a mobile station And a transmission unit for transmitting to the apparatus.
  • the cell identifier of the base station device becomes the received signal. Even if it is not included, it is possible not to judge that the area is out of the area.
  • the base station apparatus includes a transmission signal processing unit that generates a transmission signal including information on a power saving state of a neighboring cell acquired from base station apparatuses around the own station, and the generated transmission. And a transmitter that transmits a signal to the mobile station apparatus.
  • the received signal does not include the cell identifier of the base station device in the power saving state. Even so, it is possible not to judge that the area is out of the area.
  • the base station apparatus which concerns on this invention is a base station apparatus which communicates with a mobile station apparatus, Comprising: From the receiving part which receives the transmission signal of the said mobile station apparatus, and the signal received by the said receiving part To the mobile station apparatus including the received signal processing unit that demodulates the message including the identifier information of the neighboring cell, the upper layer that acquires the power saving state of the neighboring cell included in the message, and the acquired power saving information of the neighboring cell A transmission signal processing unit for generating a transmission signal of the first and second transmission units for transmitting the generated transmission signal to the mobile station apparatus.
  • the mobile station apparatus is a mobile station apparatus that performs area identification of a CSG cell using a cell identifier, and is a CSG cell that holds at least an identifier of a neighboring cell and power saving information
  • a peripheral cell information correspondence table and an area identification unit, and the area identification unit compares the identifier of the peripheral cell included in the received signal with the identifier of the CSG cell-peripheral cell information correspondence table to perform area identification. Further, the power saving information is used.
  • the cell identifier of the base station device is not included in the received signal when performing area identification. It is possible not to make a determination that the area is out of the area.
  • the mobile station apparatus is a mobile station apparatus that performs area identification of a CSG cell using a cell identifier, and is a CSG cell-neighbor cell information correspondence table holding at least an identifier of a neighboring cell. And an area identification unit for receiving neighboring cell power saving information from the serving cell and comparing the identifier of the neighboring cell included in the received signal with the identifier of the CSG cell-neighboring cell information correspondence table to identify the area In this case, the neighboring cell power saving information is used.
  • the mobile station apparatus when the mobile station apparatus performs area identification by acquiring the power saving state of the neighboring cell from the base station apparatus, the received signal does not include the cell identifier of the base station apparatus in the power saving state. Even so, it is possible not to judge that the area is out of the area.
  • the mobile station apparatus is a mobile station apparatus that performs area identification of a CSG cell using a cell identifier, and is a CSG cell that holds at least an identifier of a neighboring cell and power saving information.
  • a peripheral cell information correspondence table and an area identification unit wherein the area identification unit compares the identifier of the peripheral cell included in the received signal with the identifier of the CSG cell-peripheral cell information correspondence table to perform area identification. Further, the power saving information acquired in advance from the CSG cell is used.
  • the mobile station apparatus acquires the possibility of transition to the power saving state of the neighboring cells from the base station apparatus of the CSG cell in advance, the identifiers of some cells are received signals when performing area identification. Even when the identifier cell is not included in the area, it is possible not to determine that the cell with the identifier is out of the area when there is a possibility of transition to the power saving state.
  • wireless communications system which concerns on this invention is a radio
  • the said base station apparatus has the possibility of transfer to a power-saving state of an own station
  • the mobile station device is informed in advance of the possibility of the base station device shifting to the power saving state, and when the mobile station device performs area identification, the cell identifier of the base station device is included in the received signal. Even if it is not, it is possible to efficiently cause the mobile station apparatus to detect the CSG cell by not determining that it is out of the area.
  • the wireless communication system is a wireless communication system including a base station device and a mobile station device, wherein the base station device includes a peripheral cell acquired from a base station around the own station.
  • a transmission signal processing unit that generates a transmission signal including information on a power saving state; and a transmission unit that transmits the generated transmission signal to the mobile station device, wherein the mobile station device includes at least identifiers of neighboring cells.
  • a CSG cell-neighboring cell information correspondence table and an area identification unit wherein the mobile station apparatus receives power saving information of the neighboring cell from the base station apparatus, and includes information on neighboring cells included in the received signal.
  • the peripheral cell power saving information is used when area identification is performed by comparing the identifier with the identifier of the CSG cell-neighbor cell information correspondence table.
  • the base station apparatus when the base station apparatus notifies the mobile station apparatus of the power saving state of the neighboring cells and the mobile station apparatus performs area identification, the identifier of the cell of the base station apparatus in the power saving state is included in the received signal. Even if it is not, it is possible to efficiently cause the mobile station apparatus to detect the CSG cell by not determining that it is out of the area.
  • wireless communications system which concerns on this invention is a radio
  • the said base station apparatus includes the receiving part which receives the transmission signal of the said mobile station apparatus, A received signal processing unit that demodulates a message including identifier information of a neighboring cell from a signal received by the receiving unit, an upper layer that obtains a power saving state of the neighboring cell included in the message, and a saving of the obtained neighboring cell
  • a transmission signal processing unit that generates a transmission signal to the mobile station device that includes power information; and a transmission unit that transmits the generated transmission signal to the mobile station device.
  • a CSG cell-neighboring cell information correspondence table holding at least an identifier and power saving information, and an area registration unit, wherein the mobile station apparatus acquires the power saving information from the base station apparatus The area registration unit, and at least an identifier and a power saving information of the cell of the base station apparatus included in the acquired signal CSG cell - and storing, in the peripheral cell information corresponding table.
  • the possibility of transition to the power saving state of the neighboring cells is notified in advance from the base station apparatus of the CSG cell to the mobile station apparatus, and when the mobile station apparatus performs area identification, the cell identifier of the base station apparatus Even if the signal is not included in the received signal, it is possible to cause the mobile station apparatus to efficiently detect the CSG cell by not determining that the signal is out of the area.
  • the base station apparatus does not need to notify the power saving information of the own station, and also saves radio resources.
  • the communication method according to the present invention is a communication method of a radio communication system including a base station device and a mobile station device, and the base station device may shift to a power saving state of the own station. Including at least a step of generating a transmission signal including power saving information including presence / absence of the base station, and a step of transmitting the generated transmission signal to the mobile station device.
  • the base station In the mobile station device, at the time of area registration, the base station The method includes at least a step of holding at least an identifier of a cell of the device and power saving information.
  • the communication method according to the present invention is a communication method of a radio communication system including a base station device and a mobile station device, and includes a power saving state of a neighboring cell in the base station device. Including at least a step of generating a transmission signal including power saving information, and a step of transmitting the generated transmission signal to the mobile station device.
  • the mobile station device from the cell of the base station device to the neighboring cell
  • the area identification is performed by comparing the identifier of the neighboring cell included in the received signal and the identifier of the CSG cell-neighboring cell information correspondence table, the power saving information of the neighboring cell is used. And a step.
  • a communication method is a communication method of a radio communication system including a base station device and a mobile station device, wherein the base station device receives neighboring cell identifier information from the mobile station device.
  • Receiving a message including: acquiring a power saving state of a neighboring cell included in the message from the surrounding base station apparatus; transmitting the acquired power saving information of the neighboring cell to the mobile station apparatus; It is characterized by including.
  • the area identification unit may perform area identification by comparing an identifier of a neighboring cell included in a received signal with an identifier of a CSG cell-neighboring cell information correspondence table. Furthermore, it is characterized in that it is not determined that the cell is out of the area even if the identifier of the cell that may not transmit the synchronization signal as the power saving information is not included in the received identifier of the neighboring cell.
  • the cell identifier of the base station apparatus is not included in the received signal when performing area identification, there is a possibility that the cell with the identifier is in a power saving state in which a synchronization signal is not transmitted. In this case, it is possible not to make a determination that the area is out of the area.
  • the present invention it is possible to provide a radio communication system, a base station apparatus, a mobile station apparatus, and a communication method that allow a mobile station apparatus to efficiently perform area identification.
  • the synchronization signal (Synchronization Signals) is composed of three types of primary synchronization signals and secondary synchronization signals composed of 31 types of codes arranged alternately in the frequency domain.
  • 504 physical cell identifiers Physical Cell Identifier; PCI
  • PCI Physical Cell Identifier
  • the mobile station apparatus specifies the physical cell identifier of the synchronization signal received by the cell search.
  • the physical broadcast information channel is transmitted for the purpose of reporting control parameters (broadcast information (system information); System information) that are commonly used by mobile station apparatuses in the cell. Broadcast information that is not notified on the physical broadcast information channel is transmitted as a layer 3 message (system information) on the downlink shared channel after the radio resource is notified on the downlink control channel.
  • a cell global identifier CGI; “Cell Global Identifier”
  • TAI tracking area identifier
  • the downlink reference signal is a pilot signal transmitted at a predetermined power for each cell.
  • the downlink reference signal is a known signal that is periodically repeated at a frequency / time position based on a predetermined rule.
  • the mobile station apparatus measures the reception quality for each cell by receiving the downlink reference signal.
  • the mobile station apparatus uses the downlink reference signal as a reference signal for demodulating the downlink control channel or the downlink shared channel transmitted simultaneously with the downlink reference signal.
  • a sequence used for the downlink reference signal a sequence that can be identified for each cell is used.
  • a downlink reference signal may be described as a downlink reference signal or a cell specific RS (Cell-specific reference signals), its use and meaning are the same.
  • the downlink control channel (PDCCH; Physical Downlink Control Channel) is transmitted with several OFDM symbols from the beginning of each subframe, and the radio resource allocation information according to the scheduling of the base station device and transmission Used to indicate the amount of power increase / decrease adjustment.
  • the mobile station apparatus monitors (monitors) the downlink control channel addressed to itself before transmitting / receiving the layer 3 message (paging, handover command, etc.) that is downlink data or downlink control data, and By receiving the downlink control channel, it is necessary to acquire radio resource allocation information called an uplink grant at the time of transmission and a downlink grant at the time of reception from the downlink control channel.
  • the uplink control channel (PUCCH; Physical Uplink Control Channel) is an acknowledgment of data transmitted on the downlink shared channel, downlink propagation path information (CQI; Channel Quality dicIndicator), and uplink radio resource request. Used to make a scheduling request (SR; Scheduling Request).
  • the downlink shared channel (PDSCH: Physical Downlink Shared Channel) is used not only for downlink data but also for reporting paging and broadcast information as a layer 3 message that is downlink control data.
  • the radio resource allocation information of the downlink shared channel is indicated by the downlink control channel.
  • the uplink shared channel (PUSCH) mainly transmits uplink data and uplink control data, and can also include control data such as downlink reception quality and ACK / NACK. Similarly to the downlink, the radio resource allocation information of the uplink shared channel is indicated by the downlink control channel.
  • the random access channel (PRACH; “Physical” Random “Access” Channel) is a channel used to notify the preamble sequence and has a guard time.
  • the random access channel is used as a means for accessing the base station apparatus of the mobile station apparatus.
  • the mobile station apparatus transmits a radio resource request when the uplink control channel is not set and transmission timing adjustment information (timing advance (TA) Timing Advance) necessary to match the uplink transmission timing with the reception timing window of the base station apparatus.
  • the random access channel is used to request the base station apparatus.
  • the mobile station apparatus that has received the transmission timing adjustment information sets the effective time (TA timer) of the transmission timing adjustment information, and manages the state as the transmission timing adjustment state during the effective time and the transmission timing non-adjustment state outside the effective period To do.
  • Radio Communication System A radio communication system according to the present invention will be described with reference to FIG. In the following description, E-UTRA and Advanced E-UTRA are assumed as wireless communication systems, but the present invention is not limited to this.
  • the mobile communication system includes a base station device and a mobile station device
  • FIG. 1 is a diagram showing that base station devices Na, Nb, Nc, Nd, and mobile station devices Ua, Ub are arranged.
  • the cell of the base station apparatus Na is Ca
  • the cell of the base station apparatus Nb is Nb
  • the cell of the base station apparatus Nc is Cc
  • the cell of the base station apparatus Nd is Cd.
  • the cell Cd is assumed to be a CSG cell that can be accessed by the mobile station apparatuses Ua and Ub, and a cell having a frequency band different from that of the cells Ca, Cb, and Cc.
  • the base station apparatus Nc may shift to a power saving state.
  • the mobile stations Ua and Ub store in advance the identifiers and received power information of neighboring cells of the CSG cell in order to determine whether or not they are in the area of the CSG cell.
  • the area of the CSG cell when the identifier of the cell Cc is received in addition to the cells Ca and Cb that is, at the position of the mobile station apparatus Ua.
  • the mobile station apparatus Ub cannot receive the identifier of the cell Cc is out of the area.
  • the base station apparatus Nc is in the power saving state, it is determined that the mobile station apparatus Ua is out of the CSG cell area even at the position of the mobile station apparatus Ua.
  • FIG. 2 is a block diagram showing an outline of the base station apparatus 200 according to the first embodiment of the present invention.
  • the base station apparatus 200 includes a reception unit 201, a reception signal processing unit 202, an upper layer 203, a control unit 206, a transmission signal processing unit 204, a transmission unit 205, a reception antenna AN21, and a transmission antenna AN22.
  • the other components of the base station apparatus 200 are omitted because they are not related to the present embodiment.
  • the upper layer 203 outputs a control signal necessary for transmission to the control unit 206.
  • the mobile station apparatus outputs transmission information such as traffic data, control signals, and broadcast information (including system information) to the transmission signal processing unit 204.
  • the broadcast information includes information (power saving information) indicating whether or not the base station apparatus supports switching to the power saving state.
  • the transmission signal processing unit 204 encodes and modulates data input from the higher layer 203 based on the transmission control signal input from the control unit 206, and transmits the time / time together with the downlink shared channel, the synchronization signal, and the downlink reference signal. Arrange on the frequency axis and generate a radio frame.
  • the radio frame generated by the transmission signal processing unit 204 is output to the transmission unit 205.
  • the transmission unit 205 performs power amplification by placing the radio frame generated by the transmission signal processing unit 204 on a carrier wave having a predetermined frequency based on the transmission control signal input from the control unit 206.
  • the signal output from the transmission unit 205 is transmitted from the transmission antenna AN22.
  • the upper layer 203 outputs a control signal necessary for reception to the control unit 206.
  • a signal received by the receiving antenna AN21 is input to the receiving unit 201.
  • the receiving unit 201 converts the signal received from the mobile station apparatus into a baseband digital signal based on the reception control signal input from the control unit 206.
  • the converted signal is input to reception signal processing section 202 and demodulated and decoded based on the reception control signal input from control section 206.
  • the received signal processing unit 202 outputs control data and traffic data that have been correctly decoded to the upper layer 203.
  • the base station apparatus 200 communicates with peripheral base station apparatuses and access gateways not shown through the upper layer 203.
  • the upper layer 203 when the upper layer 203 receives an instruction to shift to the power saving mode from the access gateway, the upper layer 203 stops the operation other than the function required in the power saving mode in each block through the control unit 206.
  • the transmission unit 205 is controlled to stop transmission of all or part of the wireless transmission frame.
  • the power saving information may be information independent of other parameters related to the cell, or information set in association with other parameters (for example, included in some categories in the categorization of base station devices) Feature).
  • the power saving information may be of several types, for example, a state in which the synchronization signal is stopped (a state in which the mobile station apparatus cannot recognize the cell identifier), or a transmission power of a signal including a downlink reference signal is reduced.
  • a state of receiving (or not transmitting a part of) in a state in which the received power in the mobile station device is small
  • DTX Discontinuous Transmission
  • a state of intermittent transmission including a synchronization signal and a downlink reference signal (in which the mobile station device is intermittent)
  • DTX Discontinuous Transmission
  • the presence or absence of implementation relating to a plurality of power saving states such as a state in which the cell identifier cannot be recognized without knowing the transmission timing may be represented. Further, information indicating the frequency of shifting to the power saving state (several times a day, limited to winter, etc.) may be included.
  • FIG. 3 is a block diagram showing an outline of the mobile station apparatus 300 according to the first embodiment of the present invention.
  • the mobile station apparatus 300 includes a reception unit 301, a reception signal processing unit 302, an area identification unit 303, an area registration unit 308, a CSG cell-neighboring cell information correspondence table 309, an upper layer 307, a control unit 306, a transmission signal processing unit 304, A transmission unit 305, a reception antenna AN31, and a transmission antenna AN32 are provided.
  • the other components of the mobile station apparatus 300 are omitted because they are not related to the present embodiment.
  • the upper layer 307 outputs a control signal necessary for transmission to the control unit 306. Also, transmission information such as uplink traffic data is output to the transmission signal processing section 304.
  • the transmission signal processing unit 304 encodes and modulates data input from the higher layer 307 based on the transmission control signal input from the control unit 306, and generates an uplink transmission signal together with the reference signal.
  • the uplink transmission signal generated by the transmission signal processing unit 304 is output to the transmission unit 305.
  • the transmission unit 305 performs power amplification by placing the uplink transmission signal generated by the transmission signal processing unit 304 on a carrier wave of a predetermined frequency based on the transmission control signal input from the control unit 306.
  • the signal output from the transmission unit 305 is transmitted from the transmission antenna AN32.
  • the upper layer 307 outputs a control signal necessary for reception to the control unit 306.
  • a signal received by the receiving antenna AN31 is input to the receiving unit 301.
  • the receiving unit 301 converts the signal received from the base station apparatus 200 into a baseband digital signal based on the reception control signal input from the control unit 306.
  • the converted signal is input to reception signal processing section 302 and demodulated and decoded based on the reception control signal input from control section 306.
  • the reception signal processing unit 302 outputs control data and traffic data that have been correctly decoded to the upper layer 307.
  • the received signal processing unit 302 outputs, to the area identifying unit 303 and the area registering unit 308, information on neighboring cell identifiers, received power thereof, and, if necessary, power saving information, from the received signal.
  • the area registration unit 308 associates at least the identifier of the neighboring cell and the power saving information with the identifier of the CSG cell to be registered. And stored in the CSG cell-neighboring cell information correspondence table 309.
  • the area identifying unit 303 compares the neighboring cell information output from the received signal processing unit 302 with the neighboring cell information in the CSG cell-neighboring cell information correspondence table 309, and determines whether or not the CSG cell is in the area. I do. The determined result is notified to the upper layer 307.
  • the mobile station apparatus 300 performs area registration processing within the area of the CSG cell.
  • the area registration start instruction may be given by a key input to the mobile station apparatus 300, or may be autonomously given by the mobile station apparatus 300 when it is in a state where it can be connected to the CSG cell.
  • the mobile station apparatus 300 performs measurement of neighboring cells, physical cell identifiers from detected synchronization signals of neighboring cells, power saving information from broadcast information, and cell global identifiers if necessary to reduce area estimation errors.
  • the area registration unit 308 acquires a tracking area identifier, received power (or a path loss value obtained by a difference between transmission power included in broadcast information and actual received power), and the like.
  • the acquired information is associated with the identifier of the CSG cell and stored in the CSG cell-neighboring cell information correspondence table 309.
  • the CSG cell-neighboring cell information correspondence table is preferably updated when a certain period has passed since generation.
  • the mobile station device 300 is located in a cell other than the CSG cell.
  • the mobile station device 300 acquires the identifier of the serving cell and the identifier of the neighboring cell, and the area identifying unit 303 compares the information with the information stored in the CSG cell-neighboring cell information correspondence table 309. As a result of the comparison, if the set of identifiers associated with one CSG cell in the table matches the received identifiers of the serving cell and the neighboring cells, it is determined that the CSG cell is in the area. In addition, even if the table includes an identifier that is not included in the received identifier, the mobile station device 300 is a cell that may not transmit a synchronization signal due to power saving information.
  • the area is within the area. However, since the latter case may be out of the area, it is desirable that the frequency of performing the process for detecting the CSG cell is lower than the former.
  • the frequency of performing the process for detecting the CSG cell is lower than the former.
  • intermittent reception is performed according to the intermittent transmission cycle. By performing the processing, it can be determined whether the area is within the area.
  • the mobile station device 300 acquires the identifier of the serving cell, the identifier of the neighboring cell, and each received power, and the area identifying unit 303 performs comparison with the CSG cell-neighboring cell information correspondence table 309.
  • the area identifying unit 303 performs comparison with the CSG cell-neighboring cell information correspondence table 309.
  • the identifier and received power set associated with one CSG cell in the table match the received cell and neighboring cell identifiers and the received power, the area within the CSG cell Judge.
  • the mobile station device 300 can be considered to be in the area even if the cell of the identifier is a cell that may reduce the transmission power by the power saving information. to decide.
  • power saving information of the base station apparatus 200 is notified to the mobile station apparatus 300 in advance, and the mobile station apparatus 300 can perform CSG cell area identification in consideration of the power saving information. It becomes possible to detect CSG cells.
  • FIG. 4 is a block diagram showing an outline of the base station apparatus 400 according to the second embodiment of the present invention.
  • the base station apparatus 400 includes a reception unit 401, a reception signal processing unit 402, an upper layer 403, a control unit 406, a transmission signal processing unit 404, a transmission unit 405, a reception antenna AN41, and a transmission antenna AN42.
  • the other components of the base station apparatus 400 are omitted because they are not related to the present embodiment.
  • the upper layer 403 outputs a control signal necessary for transmission to the control unit 406.
  • the mobile station apparatus outputs transmission information such as traffic data, control signals, and broadcast information (including system information) to the transmission signal processing unit 404.
  • the broadcast information includes information (peripheral cell power saving information) indicating whether or not a neighboring cell of the cell of the base station apparatus is in a power saving state.
  • the transmission signal processing unit 404 encodes and modulates data input from the higher layer 403 based on the transmission control signal input from the control unit 406, and transmits the time / time together with the downlink shared channel, the synchronization signal, and the downlink reference signal. Arrange on the frequency axis and generate a radio frame.
  • the radio frame generated by the transmission signal processing unit 404 is output to the transmission unit 405.
  • the transmission unit 405 performs power amplification by placing the radio frame generated by the transmission signal processing unit 404 on a carrier wave having a predetermined frequency based on the transmission control signal input from the control unit 406.
  • the signal output from the transmission unit 405 is transmitted from the transmission antenna AN42.
  • the upper layer 403 outputs a control signal necessary for reception to the control unit 406.
  • a signal received by the receiving antenna AN41 is input to the receiving unit 401.
  • the reception unit 401 converts the signal received from the mobile station apparatus into a baseband digital signal based on the reception control signal input from the control unit 406.
  • the converted signal is input to reception signal processing section 402 and demodulated and decoded based on the reception control signal input from control section 406.
  • the received signal processing unit 402 outputs correctly decoded control data and traffic data to the upper layer 403.
  • the base station apparatus 400 communicates with peripheral base station apparatuses and access gateways not shown through the upper layer 403.
  • the upper layer 403 when the upper layer 403 receives an instruction to shift to the power saving mode from the access gateway, the upper layer 403 stops the operation other than the function required in the power saving mode in each block through the control unit 406.
  • the transmission unit 405 is controlled to stop transmission of all or part of the wireless transmission frame.
  • the neighboring cell power saving information may be, for example, 1-bit information that is true when any one of the neighboring cells is in the power saving state, or the cell in the power saving state. It may be identifier information. Further, not only the power saving state but also a case where wireless transmission is stopped for the purpose of maintenance or the like may be included. If it is 1-bit information, the amount of broadcast information can be reduced, and if it is identifier information, area identification in the mobile station apparatus can be performed more efficiently.
  • the information on the power saving state of the neighboring cell may be obtained by referring to information managed by a server on the network, or the information contained in the neighboring cell information (ENB CONFIGURATION) obtained by the X2 interface.
  • Power information (Deactivation / Indication) or the like may be used, or a power saving state transition notification signal notified from a neighboring cell may be used.
  • FIG. 5 is a block diagram showing an outline of a mobile station device 500 according to the second embodiment of the present invention.
  • the mobile station device 500 includes a reception unit 501, a reception signal processing unit 502, an area identification unit 503, an area registration unit 508, a CSG cell-neighboring cell information correspondence table 509, an upper layer 507, a control unit 506, a transmission signal processing unit 504, A transmission unit 505, a reception antenna AN51, and a transmission antenna AN52 are provided.
  • FIG. 3 other components of the mobile station device 500 are omitted because they are not related to the present embodiment.
  • the upper layer 507 outputs a control signal necessary for transmission to the control unit 506. Also, transmission information such as uplink traffic data is output to transmission signal processing section 504.
  • the transmission signal processing unit 504 encodes and modulates data input from the upper layer 507 based on the transmission control signal input from the control unit 506, and generates an uplink transmission signal together with the reference signal.
  • the uplink transmission signal generated by the transmission signal processing unit 504 is output to the transmission unit 505.
  • the transmission unit 505 performs power amplification by placing the uplink transmission signal generated by the transmission signal processing unit 504 on a carrier having a predetermined frequency based on the transmission control signal input from the control unit 506.
  • the signal output from the transmission unit 505 is transmitted from the transmission antenna AN52.
  • the upper layer 507 outputs a control signal necessary for reception to the control unit 506.
  • a signal received by the receiving antenna AN51 is input to the receiving unit 501.
  • the receiving unit 501 converts the signal received from the base station apparatus 400 into a baseband digital signal based on the reception control signal input from the control unit 506.
  • the converted signal is input to reception signal processing section 502 and demodulated and decoded based on the reception control signal input from control section 506.
  • the received signal processing unit 502 outputs correctly decoded control data and traffic data to the upper layer 507.
  • the received signal processing unit 502 outputs an identifier of the neighboring cell and information on the received power from the received signal to the area identifying unit 503 and the area registering unit 508.
  • the area registration unit 508 associates at least the identifier of the neighboring cell with the identifier of the neighboring CSG cell among the received neighboring cell information, It is stored in the cell information correspondence table 509.
  • the area identifying unit 503 compares the neighboring cell information output from the received signal processing unit 502 with the neighboring cell information in the CSG cell-neighboring cell information correspondence table 509, and determines whether or not the CSG cell is in the area. I do. The determined result is notified to the upper layer 507.
  • the mobile station device 500 performs an area registration process within the area of the CSG cell.
  • the area registration start instruction may be performed by key input to the mobile station device 500, or may be autonomously performed by the mobile station device 500 when the mobile station device 500 is connected to the CSG cell.
  • the mobile station device 500 performs measurement of neighboring cells and, from the detected neighboring cell synchronization signal, physical cell identifiers, and cell global identifiers, tracking area identifiers, received power as necessary to reduce area estimation errors. (Or a path loss value obtained from the difference between the transmission power included in the broadcast information and the actual reception power) is acquired by the area registration unit 508.
  • the area registration unit 508 When there are a plurality of detected neighboring cells, the above process is performed for each cell.
  • the acquired information is associated with the identifier of the CSG cell and stored in the CSG cell-neighbor cell information correspondence table 509.
  • the CSG cell-neighboring cell information correspondence table is preferably updated when a certain period has passed since generation.
  • the mobile station device 500 is located in a cell other than the CSG cell.
  • the mobile station device 500 acquires the identifier of the serving cell and the identifier of the neighboring cell, and the area identifying unit 503 compares the information with the information stored in the CSG cell-neighboring cell information correspondence table 509.
  • the identifiers associated with one CSG cell in the table excluding the identifier included in the neighboring cell power saving information, and the received serving cell and neighboring cell identifiers match Is determined to be within the area of the CSG cell.
  • the neighboring cell power saving information is not an identifier and is 1-bit information indicating that at least one cell is in a power saving state
  • an identifier that is not included in the received identifier is included in the table. Is determined to be within the area. However, since the latter case may be out of the area, it is desirable that the frequency of performing the process for detecting the CSG cell is lower than the former.
  • the area identification processing considering the information is performed as in the first embodiment. Can do. For example, when a neighboring cell is in an intermittent transmission state, an identifier is acquired by intermittent reception to perform area identification.
  • the base station apparatus 400 of the serving cell notifies the mobile station apparatus 500 of the power saving information of the neighboring cell, and the mobile station apparatus 500 performs CSG cell area identification in consideration of the neighboring cell power saving information. Therefore, it is possible to efficiently detect the CSG cell.
  • FIG. 6 is a block diagram showing an outline of a base station apparatus 600 according to the third embodiment of the present invention.
  • the base station device 600 includes a reception unit 601, a reception signal processing unit 602, an upper layer 603, a control unit 606, a transmission signal processing unit 604, a transmission unit 605, a reception antenna AN61, and a transmission antenna AN62.
  • the other components of the base station apparatus 600 are omitted because they are not related to the present embodiment.
  • the upper layer 603 outputs a control signal necessary for transmission to the control unit 606. Also, transmission information such as traffic data, control signals, broadcast information (including system information) for the mobile station apparatus is output to the transmission signal processing unit 604.
  • the transmission signal processing unit 604 encodes and modulates data input from the upper layer 603 based on the transmission control signal input from the control unit 606, and transmits the time / time together with the downlink shared channel, the synchronization signal, and the downlink reference signal. Arrange on the frequency axis and generate a radio frame. The radio frame generated by the transmission signal processing unit 604 is output to the transmission unit 605.
  • the transmission unit 605 performs power amplification by placing the radio frame generated by the transmission signal processing unit 604 on a carrier wave of a predetermined frequency based on a transmission control signal input from the control unit 606.
  • the signal output from the transmission unit 605 is transmitted from the transmission antenna AN62.
  • the upper layer 603 outputs a control signal necessary for reception to the control unit 606.
  • a signal received by the receiving antenna AN61 is input to the receiving unit 601.
  • the receiving unit 601 converts the signal received from the mobile station apparatus into a baseband digital signal based on the reception control signal input from the control unit 606.
  • the converted signal is input to reception signal processing section 602, and demodulated and decoded based on the reception control signal input from control section 606.
  • the received signal processing unit 602 outputs correctly decoded control data and traffic data to the upper layer 603.
  • the base station apparatus 600 communicates with peripheral base station apparatuses and access gateways not shown through the upper layer 603.
  • the upper layer 603 when the upper layer 603 receives an instruction to shift to the power saving mode from the access gateway, the upper layer 603 stops operations other than the functions required in the power saving mode in each block through the control unit 606.
  • the transmission unit 605 is controlled to stop transmission of all or part of the wireless transmission frame.
  • FIG. 7 is a block diagram showing an outline of a mobile station device 700 according to the third embodiment of the present invention.
  • the mobile station device 700 includes a reception unit 701, a reception signal processing unit 702, an area identification unit 703, an area registration unit 708, a CSG cell-neighbor cell information correspondence table 709, an upper layer 707, a control unit 706, a transmission signal processing unit 704, A transmission unit 705, a reception antenna AN71, and a transmission antenna AN72 are provided.
  • other components of the mobile station device 700 are omitted because they are not related to the present embodiment.
  • the upper layer 707 outputs a control signal necessary for transmission to the control unit 706. Also, transmission information such as uplink traffic data is output to transmission signal processing section 704.
  • the transmission signal processing unit 704 encodes and modulates data input from the upper layer 707 based on the transmission control signal input from the control unit 706, and generates an uplink transmission signal together with the reference signal.
  • the uplink transmission signal generated by the transmission signal processing unit 704 is output to the transmission unit 705.
  • the transmission unit 705 performs power amplification by placing the uplink transmission signal generated by the transmission signal processing unit 704 on a carrier wave of a predetermined frequency based on the transmission control signal input from the control unit 706.
  • the signal output from the transmission unit 705 is transmitted from the transmission antenna AN72.
  • the upper layer 707 outputs a control signal necessary for reception to the control unit 706.
  • a signal received by the receiving antenna AN71 is input to the receiving unit 701.
  • the receiving unit 701 converts the signal received from the base station apparatus into a baseband digital signal based on the reception control signal input from the control unit 706.
  • the converted signal is input to reception signal processing section 702, and demodulated and decoded based on the reception control signal input from control section 706.
  • the received signal processing unit 702 outputs correctly decoded control data and traffic data to the upper layer 707.
  • Received signal processing section 702 also outputs the identifier of the neighboring cell and its received power from the received signal to area identification section 703 and area registration section 708.
  • the area registration unit 708 associates at least the identifier of the neighboring cell and the power saving information with the identifier of the CSG cell to be registered. And stored in the CSG cell-neighboring cell information correspondence table 709.
  • the area identifying unit 703 compares the neighboring cell information output from the received signal processing unit 702 with the neighboring cell information in the CSG cell-neighboring cell information correspondence table 709, and determines whether or not the CSG cell is in the area. I do. The determined result is notified to the upper layer 707.
  • the mobile station device 700 performs area registration processing in the area of the CSG cell.
  • the area registration start instruction may be given by a key input to the mobile station apparatus 700, or may be autonomously given by the mobile station apparatus 700 when it is in a state where it can be connected to the CSG cell.
  • the mobile station apparatus 700 performs measurement of neighboring cells, and if necessary to reduce area estimation errors, physical cell identifiers from the detected neighboring cell synchronization signals, cell global identifiers, tracking area identifiers, and received power. (Or a path loss value obtained from the difference between the transmission power included in the broadcast information and the actual reception power) is acquired by the area registration unit 708.
  • the area registration unit 708 When there are a plurality of detected neighboring cells, the above process is performed for each cell.
  • the acquired information is associated with the CSG cell identifier and stored in the CSG cell-neighbor cell information correspondence table 709.
  • the CSG cell-neighboring cell information correspondence table is preferably updated when a certain period has passed since generation.
  • the mobile station apparatus 700 acquires from the CSG cell information about whether or not the neighboring cell may be in a power saving state by the sequence shown in FIG. 8, and adds it to the CSG cell-neighboring cell information correspondence table. Specifically, in FIG. 8, the mobile station apparatus 700 makes a power saving information request to the CSG cell being connected (step S81). In the power saving information request, the mobile station device 700 includes a list of identifiers of neighboring cells associated with the CSG cell included in the CSG cell-neighboring cell information correspondence table.
  • the base station apparatus 600 of the CSG cell that has received the power saving information request responds with the power saving information of the neighboring cell corresponding to the identifier list of the neighboring cell included in the power saving information request (step S82).
  • the power saving information of the neighboring cell may be obtained by referring to information managed by a server on the network, or may be obtained directly from the neighboring cell using the X2 interface.
  • the power saving information can be the same information as the power saving information in the first embodiment.
  • the mobile station apparatus 700 may transmit the identifier list only when the request permission is returned from the CSG cell without including the identifier list in the power saving information request in step S81.
  • the mobile station apparatus 700 may include the information on the implementation of the power saving state described in the first embodiment as the power saving information, and, as in the first embodiment, the area identification considering the information. Processing can be performed.
  • the power saving information of neighboring cells is broadcast from the base station apparatus 600 of the CSG cell to the mobile station apparatus 700 in advance.
  • CSG cell area identification can be performed in consideration of power saving information, and CSG cell detection can be performed efficiently.
  • the base station device broadcasts its own power saving information and neighboring cell power saving information
  • the mobile station device performs the area registration of the first embodiment.
  • Area identification is performed more efficiently by determining the combination of the power saving information held in the CSG cell-neighboring cell information correspondence table of the local station and the neighboring cell power saving information broadcast from the serving cell. It can be performed.
  • each part of the base station apparatus and mobile station apparatus or a program for realizing a part of these functions is recorded on a computer-readable recording medium, and the program recorded on the recording medium is stored in a computer system.
  • the control shown in each embodiment may be performed by reading and executing.
  • the “computer system” includes an OS and hardware such as peripheral devices.
  • the “computer-readable recording medium” means a storage device such as a flexible disk, a magneto-optical disk, a portable medium such as a ROM and a CD-ROM, and a hard disk incorporated in a computer system. Further, the “computer-readable recording medium” dynamically holds a program for a short time, like a communication line when transmitting a program via a network such as the Internet or a communication line such as a telephone line. In this case, it is also assumed that a server that holds a program for a certain time, such as a volatile memory inside a computer system that serves as a server or client.
  • the program may be a program for realizing a part of the functions described above, and may be a program capable of realizing the functions described above in combination with a program already recorded in a computer system.
  • each functional block used in each of the above embodiments may be realized as an LSI that is typically an integrated circuit.
  • Each functional block may be individually formed into chips, or a part or all of them may be integrated into a chip.
  • the method of circuit integration is not limited to LSI, and may be realized by a dedicated circuit or a general-purpose processor.
  • an integrated circuit based on the technology can also be used.

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

Abstract

La station de base objet de l'invention diffuse un signal indiquant si elle peut ou si elle ne peut pas se mettre dans un état d'économie d'énergie. La station mobile ci-décrite stocke ledit signal en plus d'un identifiant pendant l'enregistrement de zone des cellules CSG, et pendant l'identification de zone, ladite identification de zone est effectuée sur la base du signal susmentionné. De cette façon, dans un système de communication sans fil, les stations mobiles peuvent effectuer une identification de zone basée sur les stations de base dans un état d'économie d'énergie.
PCT/JP2011/057760 2010-04-05 2011-03-29 Système de communication sans fil, station de base, station mobile et procédé de communication Ceased WO2011125640A1 (fr)

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JP2010086743A JP2011223081A (ja) 2010-04-05 2010-04-05 無線通信システム、基地局装置、移動局装置および通信方法

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