WO2014069590A1 - 基地局および端末 - Google Patents
基地局および端末 Download PDFInfo
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- WO2014069590A1 WO2014069590A1 PCT/JP2013/079606 JP2013079606W WO2014069590A1 WO 2014069590 A1 WO2014069590 A1 WO 2014069590A1 JP 2013079606 W JP2013079606 W JP 2013079606W WO 2014069590 A1 WO2014069590 A1 WO 2014069590A1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/0005—Control or signalling for completing the hand-off
- H04W36/0011—Control or signalling for completing the hand-off for data sessions of end-to-end connection
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/24—Reselection being triggered by specific parameters
- H04W36/30—Reselection being triggered by specific parameters by measured or perceived connection quality data
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/24—Reselection being triggered by specific parameters
- H04W36/30—Reselection being triggered by specific parameters by measured or perceived connection quality data
- H04W36/302—Reselection being triggered by specific parameters by measured or perceived connection quality data due to low signal strength
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W84/00—Network topologies
- H04W84/02—Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
- H04W84/04—Large scale networks; Deep hierarchical networks
- H04W84/042—Public Land Mobile systems, e.g. cellular systems
- H04W84/045—Public Land Mobile systems, e.g. cellular systems using private Base Stations, e.g. femto Base Stations, home Node B
Definitions
- the present invention relates to a base station and a terminal.
- This application claims priority based on Japanese Patent Application No. 2012-241503 filed in Japan on November 1, 2012, the contents of which are incorporated herein by reference.
- a wireless communication system such as a cellular phone
- a plurality of base stations eNB: evolved NodeB
- UE User Equipment
- a wireless communication system such as a cellular phone
- a plurality of base stations eNB: evolved NodeB
- UE User Equipment
- the range (communication area) that each base station can connect to the terminal is called a cell
- the area where the cell is divided into several ranges is called a sector
- each base station is connected to the terminal in units of cells or sectors. Manage connections.
- a small power base station (LPN: Low Power Node, LPN) in a cell having a large cell radius and a communication area (for example, a macro cell, hereinafter referred to as a macro cell). It has been proposed to arrange cells (picocells, femtocells, small cells, etc., hereinafter referred to as small cells) formed by picocell base stations, femtocell base stations, etc. (Non-patent Document 1).
- the low power base station refers to a base station whose transmission power is smaller than that of the macro cell base station.
- Non-Patent Document 1 discloses disposing a plurality of small cells in a macro cell. For example, a procedure when a terminal connected to a low-power base station changes connection to another base station or a new one is disclosed. No specific implementation means relating to handover of a terminal connected to a low power base station, such as a connection destination determination method, is disclosed. Here, handover refers to switching the base station to which the terminal is connected as the terminal moves.
- the low-power base station needs to determine a new connection destination and perform a procedure for handover. For this reason, the low power base station becomes a highly functional base station such as a macro cell base station, and the processing of the low power base station increases. This leads to an increase in size and cost of the small power base station, and it becomes difficult to arrange a large number of small power base stations in the macro cell.
- the present invention has been made in view of the above problems, and it is an object of the present invention to provide a base station and a terminal that can reduce processing of a low-power base station and can efficiently switch a connection destination.
- each configuration of the base station and the terminal according to the present invention is as follows.
- a first base station is a communication system including a first base station, a second base station, and at least one terminal connected to the second base station. Information on the reception quality of the terminal with respect to the second base station and a neighboring base station located around the second base station.
- a first base station is the first base station described above, and when there is a first handover request for changing a connection destination of the terminal, the reception A third base station that is a new connection destination of the terminal may be determined based on the quality.
- a first base station is the first base station described above, and may be configured to make the first handover request based on the reception quality.
- the first base station according to an aspect of the present invention may be the first base station described above, and the first handover request may be notified from the second base station.
- a first base station according to an aspect of the present invention is the first base station described above, wherein the first handover request includes information necessary for changing a connection destination of a terminal. One handover query may be used.
- a first base station according to an aspect of the present invention is the first base station described above, and notifies the third base station of a second handover request for connection of the terminal. May be configured.
- a first base station according to an aspect of the present invention is the first base station, and is configured to receive a response to the second handover request from the third base station. May be.
- a first base station according to an aspect of the present invention is the first base station described above, and when the response to the second handover request is ACK, the terminal The terminal may be instructed to connect to the terminal, and may be configured to notify the terminal of target base station information that is information of the third base station.
- a first base station according to an aspect of the present invention is the first base station described above, and when the response to the second handover request is ACK, the first base station The terminal may be configured to instruct to connect to the third base station.
- a first base station according to an aspect of the present invention is the first base station, wherein the second handover request includes information necessary for the terminal to connect. It may be an inquiry.
- a second base station is a communication system including a first base station, a second base station, and at least one terminal connected to the second base station. If the second base station determines whether or not to change the connection destination of the terminal, and determines that it should be changed, it notifies the first base station of the first handover request.
- a second base station is the second base station described above, wherein a notification that the terminal connects to a third base station is sent from the first base station. It may be configured to receive and notify the terminal of a connection instruction to the third base station and notify the terminal of information of the third base station.
- a second base station is the second base station described above, wherein the first handover request includes information necessary for changing a connection destination of a terminal.
- One handover query may be used.
- a terminal is a terminal of a communication system including a first base station, a second base station, and at least one terminal connected to the second base station, Information on the reception quality of the terminal with respect to the second base station and the neighboring base stations located around the second base station is notified to the first base station.
- a terminal according to an aspect of the present invention is the terminal described above, wherein at least one of the first base station or the second base station is a third base station that is a new connection destination. The information may be received and communication with the third base station may be started using the information of the third base station.
- the processing of the low power base station can be reduced and the connection destination can be switched efficiently.
- FIG. 3 is a schematic block diagram illustrating a configuration example of a low power base station 200-x in the first embodiment. It is a schematic block diagram which shows the structural example of the terminal 300 in 1st Embodiment.
- FIG. 1 is a schematic diagram illustrating a configuration example of a communication system according to the first embodiment.
- the communication system according to the present embodiment includes a low-power base station 200-x in a macro cell 10 (macro area) whose communication area is a wide area by a macro cell base station 100 (first base station).
- the small cell 20-x has a communication area as an area constituted by
- x is an arbitrary positive integer, and 1 ⁇ x ⁇ 4 in the example of the present embodiment.
- terminal 300 is connected to low-power base station 200-2 and is moving in the direction of low-power base station 200-4.
- the terminal 300 may be connected to any one of the low power base stations 200-x and exist at an arbitrary position in the macro area.
- the macro cell base station manages the connection of the terminal and assists the handover of the terminal connected to the low power base station.
- the distinction between the macro cell base station and the low power base station is only transmission power. Instead, it may be distinguished between a backward compatible cell that supports a service-in method and a newly defined cell that is not backward compatible.
- the transmission power and communication area may be different between base stations included in a small cell, such as a picocell base station and a femtocell base station, but the present invention can also be applied in such an environment.
- the macro cell base station and the low power base station are connected by a backhaul line, and a wire such as an optical fiber or an X2 interface may be used, or a radio such as a relay base station may be used.
- the communication system of FIG. 1 is assumed as an example. However, the present embodiment can be applied to any communication system in which at least one small cell is configured in a macro cell. , The number of terminals, the type of cell (eg, pico cell, femto cell, etc.), the type of base station, etc. are not limited to this embodiment.
- FIG. 2 is a schematic diagram illustrating a configuration example of a communication system in which the macro cell base station 100 manages connection with the terminal 300 in units of sectors.
- the macro cell 10 is configured by sectors in one direction of the macro cell base station 100, and at least one small cell 20 -x is arranged in the macro cell 10. These points are the same not only in the first embodiment but also in other embodiments. 1 and 2, the small cell completely overlaps the macro cell, but may partially overlap or not overlap, and the present invention is not limited to this.
- the base station (macrocell base station 100 and low-power base station 200-x) of each cell periodically transmits a synchronization signal (SS: Synchronization Signal), a tracking signal, and a measurement signal.
- SS Synchronization Signal
- the synchronization signal is a signal for searching (cell search) for a carrier frequency and cell ID such as PSS (Primary SS) and SSS (Secondary SS) defined in 3GPP (The Third Generation Partnership project), for example. It is.
- the tracking signal is a signal for identifying the sample point of the received signal more accurately than the synchronization signal.
- the measurement signal is a signal for measuring reception quality, and is a cell-specific reference signal, a common pilot signal, or the like.
- RSRP Reference Signal Received Power
- all base stations do not necessarily have to transmit all these signals. For example, only a part of the signals may be transmitted, such as transmitting only a tracking signal and a measurement signal.
- the signal format may be changed.
- the macrocell base station 100 uses a method in which the macrocell base station maintains backward compatibility, and the low-power base station uses a new method (for example, NCT (referred to as New Carrier Type in 3GPP))
- NCT referred to as New Carrier Type in 3GPP
- the macrocell base station 100 has a signal format that includes all signals, but the low-power base station 200-x uses a tracking signal.
- the signal format may include only the measurement signal, and the tracking signal and the measurement signal may be the same signal, and in the following, the tracking signal and the measurement signal have the same signal format.
- the tracking signal and the measurement signal may have the same signal format.
- the search for the carrier frequency and the search for the cell ID are defined as the cell search, and the identification of the sample point is defined as the synchronization. However, if the same processing is performed, the search is essentially the same. is there.
- FIG. 3 is a sequence diagram illustrating an example of a processing flow of the communication system according to the first embodiment.
- a source base station also referred to as a second base station or a serving cell
- a target base station also referred to as a third base station
- a specific base station manages the connection between a plurality of other base stations and a terminal is also included in the present invention.
- the terminal 300 receives the measurement signal transmitted from the peripheral base station and the low power base station 200-2, and measures the reception quality of the peripheral base station and the low power base station 200-2 from the measurement signal (step S101). ).
- the peripheral base station represents a base station located in the vicinity of the source base station.
- the macro cell base station determines the peripheral base station from the cell arrangement or the like, and instructs the terminal 300 in advance to the peripheral base station. Also good.
- the reception quality may be any reception quality, reception SINR (Signal to Interference plus Noise power Ratio), or the like that represents the reception quality between the base station and the terminal 300. Quality is preferred.
- the terminal 300 notifies the reception quality of the neighboring base station and the low power base station 200-2 to the macro cell base station 100 and the low power base station 200-2 (step S102).
- the terminal 300 may notify the macro cell base station of the reception qualities of the neighboring base station and the low power base station 200-2, and the low power base station 200-2.
- the terminal 300 periodically measures and notifies the reception quality, but the notification of the reception quality may be notified only when the reception quality changes.
- the macro cell base station 100 determines whether or not handover is necessary based on the reception quality notified from the terminal 300 (step S103).
- step S103 when the reception quality notified from the terminal 300 is only the reception quality of the source base station, for example, the macro cell base station 100 sets a threshold in advance, and the reception quality of the low-power base station 200-2 is the threshold. Is below, the macrocell base station 100 can determine that the terminal 300 is to be handed over. On the other hand, when the reception quality of the low power base station 200-2 exceeds the threshold, the macro cell base station 100 can determine that the terminal 300 is not to be handed over.
- macro cell base station 100 compares the notified reception quality of the neighboring base station and low power base station 200-2. If there is a base station with better reception quality than the low-power base station 200-2, it can be determined that handover is performed. If it is determined in step S103 that a handover is to be performed, the processing after step S104 is performed. When it is determined in step S103 that a handover is to be performed, requesting a change of the connection destination of the terminal 300 is also called a first handover request, and the macro cell base station 100 has a first handover request. In this case, the processing after step S104 is performed to determine the target base station.
- Macro cell base station 100 determines the target base station based on the reception quality notified from terminal 300 (step S104).
- the macrocell base station 100 compares the reception qualities of the neighboring base station and the low-power base station 200-2, and the base station with the best reception quality is preferably the target base station. For example, when the received power of the low power base station 200-4 is the highest, the target base station is set to the low power base station 200-4.
- Macro cell base station 100 may determine the target base station in consideration of the connection status of each base station in addition to the reception quality. Further, the macro cell base station 100 uses information indicating the target base station (for example, the cell ID of the target base station) as the target base station information.
- the macro cell base station 100 notifies the low power base station 200-4 of the handover request (second handover request) through the backhaul line (step S105).
- the low power base station 200-4 determines whether or not it can be connected to the terminal 300, and notifies the macro cell base station 100 of the availability of handover (for example, handover request ACK / NACK) through the backhaul line (step S106).
- the low power base station 200-4 performs connection preparation such as scheduling when connection is possible.
- the macrocell base station 100 notifies the low-power base station 200-2 of the target base station information through the backhaul line, and instructs to hand over to the target base station (step S107).
- the low-power base station 200-2 notifies the terminal 300 of the target base station information and instructs the target base station to perform handover (step S108).
- the terminal 300 receives the target base station information notified from the low power base station 200-2 (step S109), and generates a synchronization signal for the target base station (step S110). Also, the terminal 300 synchronizes with the target base station (step S111) and connects to the target base station (step S112).
- FIG. 4 is a schematic block diagram illustrating a configuration example of the macro cell base station 100 according to the first embodiment.
- the macrocell base station 100 includes a data processing unit 101-1, a handover determination unit 101-2, a target base station determination unit 101-3, an information data generation unit 101-4, a physical layer control unit 102, an encoding unit 103, a modulation unit. 104, reference signal generation unit 105, control signal generation unit 106, synchronization signal generation unit 107, resource mapping unit 108, IFFT unit 109, CP insertion unit 110, transmission unit 111, transmission antenna unit 112, reception antenna unit 121, reception unit 122, a control information detection unit 123, and an information data detection unit 124.
- the data processing unit 101-1, the handover determining unit 101-2, the target base station determining unit 101-3, and the information data generating unit 101-4 are referred to as an upper layer 101. Further, when a part or all of the macro cell base station 100 is formed into a chip to form an integrated circuit, a chip control circuit (not shown) for controlling each functional block is provided. In FIG. 4, the number of transmission antennas and the number of reception antennas are one, but a plurality of antennas may be used.
- the macro cell base station 100 receives a signal transmitted from the terminal 300 via the reception antenna unit 121.
- the signal received by the macrocell base station 100 includes a control signal, an uplink data signal, and the like.
- the control signal includes information regarding parameters of a transmission signal that the macro cell base station 100 transmits in the downlink.
- the information related to the parameters of the transmission signal includes a channel quality indicator (CQI: Channel Quality Indicator), the number of MIMO transmission ranks and the number of spatial multiplexing (RI: Rank Indicator), and other information related to downlink scheduling.
- Scheduling refers to determining at which time (timing) and in which frequency band a certain data is transmitted.
- the scheduling information refers to information regarding the determined time and frequency band. For example, in LTE and LTE-A, it means determining to which resource block information data or the like is allocated.
- a resource block is a signal allocation unit configured by collecting a plurality of resource elements, which are minimum units for arranging a signal composed of one subcarrier and one OFDM symbol, in OFDM transmission.
- the control signal is transmitted using an uplink control channel (PUCCH: Physical Uplink Control Channel) or the like.
- PUCCH Physical Uplink Control Channel
- the uplink data signal includes information required by the upper layer 101.
- the reception quality is included in the uplink data signal.
- the control signal of the upper layer 101 is transmitted using an uplink shared channel (PUSCH: Physical Uplink Shared Channel) or the like.
- the receiving unit 122 down-converts (radio frequency conversion) the received signal to a frequency band that can be subjected to digital signal processing such as signal detection processing, and further performs filtering processing. Also, the filtered signal is converted from an analog signal to a digital signal (A / D conversion: Analog to Digital conversion), a control signal is output to the control information detection unit 123, and an upstream data signal is output to the information data detection unit 124 To do.
- a / D conversion Analog to Digital conversion
- the control information detection unit 123 performs demodulation processing and decoding processing on the control signal input from the reception unit 122, detects control information, and outputs the control information to the physical layer control unit 102.
- the information data detection unit 124 performs demodulation processing, decoding processing, and the like on the uplink data signal input from the reception unit 122, detects uplink information data, and outputs it to the upper layer 101 (data processing unit 101-1). To do.
- the upper layer 101 is connected to other base stations via a backhaul line and transmits / receives data.
- the upper layer includes an RRC (Radio Resource Control) layer.
- the data processing unit 101-1 performs processing of data acquired by the upper layer 101. First, the data processing unit 101-1 detects reception quality from the uplink information data input from the information data detection unit 124, and outputs the received quality to the handover determination unit 101-2.
- the handover determination unit 101-2 determines whether the terminal 300 needs to be handed over based on the reception quality input from the data processing unit 101-1 (step S103 in FIG. 3). In addition, when the handover determining unit 101-2 determines to perform handover, it outputs the reception quality to the target base station determining unit 101-3.
- the target base station determination unit 101-3 determines the target base station based on the reception quality input from the handover determination unit 101-2 (step S104 in FIG. 3), and obtains the target base station information from the data processing unit 101- Output to 1. In the present embodiment, it is assumed that the target base station is determined to be the low power base station 200-4.
- the data processing unit 101-1 notifies the target base station of a handover request through the backhaul line (step S105 in FIG. 3), and receives a handover permission notification from the target base station (step S106 in FIG. 3).
- step S106 when a notification indicating that the handover is permitted (for example, handover request ACK) is received, the data processing unit 101-1 notifies the target base station information to the source base station through the backhaul line, and performs handover.
- An instruction is given (step S107 in FIG. 3).
- the information data generation unit 101-4 converts data (transmission data) to be transmitted from the macro cell base station 100 to the terminal 300 into a predetermined signal format and sets it as downlink information data.
- the downlink information data includes data transferred from a MAC (Medium Access Control) layer to a physical layer and parameters set in the RRC layer that controls these parameters. Further, the information data generation unit 101-4 outputs the downlink information data to the physical layer control unit 102.
- MAC Medium Access Control
- the physical layer control unit 102 outputs the downlink information data input from the information data generation unit 101-4 to the encoding unit 103. Further, the physical layer control unit 102 determines a reference signal generation pattern based on the control information input from the control information detection unit 123, and outputs the reference signal generation pattern to the reference signal generation unit 105. Further, the physical layer control unit 102 outputs the control information input from the control information detection unit 123 to the control signal generation unit 106.
- the encoding unit 103 performs error correction encoding on the downlink information data input from the physical layer control unit 102.
- the encoding method used when the encoding unit 103 performs error correction encoding is, for example, turbo encoding, convolutional encoding, or low density parity check encoding (LDPC). coding) and the like.
- the encoding unit 103 performs rate matching processing on the encoded bit sequence in order to match the coding rate of the error correction encoded data sequence with the encoding rate corresponding to the data transmission rate. May be. Further, the encoding unit 103 may have a function of rearranging and interleaving the error correction encoded data series.
- the modulation unit 104 modulates the signal input from the encoding unit 103 to generate a modulation symbol.
- the modulation processing performed by the modulation unit 104 is, for example, BPSK (Binary Phase Shift Keying; two-phase phase modulation), QPSK (Quadrature Phase Shift Keying; four-phase phase modulation), QAM (Quadrature Amplitude Modulation; etc.).
- Modulating section 104 may have a function of rearranging generated modulation symbols and interleaving them.
- the reference signal generation unit 105 generates a reference signal (pilot signal) from the reference signal generation pattern input from the physical layer control unit 102, and outputs the generated reference signal to the resource mapping unit 108.
- the reference signal is used for estimation of propagation path characteristics from the macrocell base station 100 to the terminal 300, measurement of received power, positioning, and the like.
- the control signal generation unit 106 generates a control signal from the control information input from the physical layer control unit 102.
- the control signal may be subjected to error correction coding and modulation processing.
- the synchronization signal generation unit 107 generates a synchronization signal according to a rule determined in advance by the system based on the cell ID of the local station.
- the resource mapping unit 108 maps modulation symbols, reference signals, control signals, and synchronization signals to resource elements based on the resource allocation information generated by the control information generation unit 106 (referred to as resource mapping).
- the IFFT unit 109 converts the frequency domain signal input from the resource mapping unit 108 into a time domain signal by performing a fast Fourier transform (IFFT: Inverse Fast Fourier Transform).
- IFFT section 109 may use another processing method, for example, inverse discrete Fourier transform (IDFT: Inverse Discrete Fourier Transform) instead of IFFT as long as it can convert a frequency domain signal into a time domain signal.
- IDFT Inverse Discrete Fourier Transform
- the CP insertion unit 110 adds an CP (Cyclic Prefix) to the time domain signal (referred to as a valid symbol) input from the IFFT unit 109 to generate an OFDM symbol.
- CP is a guard interval added for the purpose of avoiding multipath interference caused by delayed waves.
- the transmission unit 111 converts the OFDM symbol input from the CP insertion unit 110 from a digital signal to an analog signal (D / A conversion: Digital to Analog conversion). In addition, the transmission unit 111 generates a band-limited signal by band-limiting the generated analog signal by filtering processing, up-converts the generated band-limited signal to a radio frequency band, and transmits the signal from the transmission antenna unit 112.
- FIG. 5 is a schematic block diagram illustrating a configuration example of the low-power base station 200-x in the first embodiment.
- the low power base station 200-x includes a data processing unit 201-1, an information data generation unit 201-2, a physical layer control unit 102, an encoding unit 103, a modulation unit 104, a reference signal generation unit 105, and a control signal generation unit 106. , Synchronization signal generation unit 107, resource mapping unit 108, IFFT unit 109, CP insertion unit 110, transmission unit 111, transmission antenna unit 112, reception antenna unit 121, reception unit 122, control information detection unit 123, and information data detection Part 124 is provided.
- the data processing unit 201-1 and the information data generation unit 201-2 are referred to as an upper layer 201.
- the number of transmission antennas and the number of reception antennas are one, but there may be a plurality of antennas.
- the difference between the low-power base station 200-x and the macrocell base station 100 is the upper layer.
- the upper layer 201 will be described in FIG. 5, but the processes with the same numbers as those in FIG. 4 are the same as the processes in FIG. 4.
- the low power base station 200-4 (target base station) will be described.
- the data processor 201-1 receives the handover request from the macrocell base station 100 through the backhaul line (step S105 in FIG. 3). Also, the data processing unit 201-1 determines whether or not the terminal 300 can be connected, and notifies the macro cell base station 100 of whether or not handover is possible (step S106 in FIG. 3). Here, when it is determined that connection is possible, the information data generation unit 201-2 converts the data to be transmitted from the low power base station 200-4 to the terminal 300 into a predetermined signal format and sets it as downlink information data. .
- the low power base station 200-2 (source base station) will be described.
- the data processing unit 201-1 receives the handover instruction from the macrocell base station 100 through the backhaul line (step S107 in FIG. 3).
- step S107 when the handover instruction is received, the data processing unit 201-1 detects the target base station information included in the handover instruction and outputs it to the information data generation unit 201-2.
- the information data generation unit 201-2 converts the data to be transmitted from the low power base station 200-2 to the terminal 300 and the target base station information into a predetermined signal format to obtain downlink information data.
- FIG. 6 is a schematic block diagram illustrating a configuration example of the terminal 300 according to the first embodiment.
- the terminal 300 includes a reception antenna unit 301, a reception unit 302, a synchronization signal generation unit 303, a synchronization unit 304, a CP removal unit 305, an FFT unit 306, a propagation path estimation unit 307, a control information detection unit 308, a propagation path compensation unit 309, A demodulation unit 310, a decoding unit 311, a reception quality calculation unit 312, a physical layer control unit 313, an upper layer 314, a control signal generation unit 321, a data signal generation unit 322, a transmission unit 323, and a transmission antenna unit 324 are provided. .
- a chip control circuit (not shown) for controlling each functional block is provided.
- the number of transmitting antennas and the number of receiving antennas are one, but the number of antennas may be plural.
- the terminal 300 receives signals transmitted from the macro cell base station 100 and the low power base station 200-x via the reception antenna unit 301.
- the receiving unit 302 down-converts the radio frequency signal input from the receiving antenna unit 301 into a frequency band in which digital signal processing is possible, and further performs filtering processing. Further, the reception unit 302 performs A / D conversion on the signal subjected to the filtering process from an analog signal to a digital signal, and outputs the converted digital signal to the synchronization unit 304.
- the receiving unit 302 When detecting the synchronization signal of the low power base station 200-x, the receiving unit 302 detects the radio frequency signal by matching the radio frequency with the frequency assigned to the low power base station 200-x.
- the synchronization signal generator 303 generates a synchronization signal corresponding to the base station that performs synchronization.
- the synchronization unit 304 performs synchronization based on the signal input from the reception unit 302 and the signal input from the synchronization signal generation unit 303, and outputs the received signal to the CP removal unit 305 when the synchronization is completed. .
- CP removing section 305 removes CP from the signal output from receiving section 302 in order to avoid distortion due to delayed waves, and outputs the removed signal to FFT section 306.
- the FFT unit 306 performs fast Fourier transform (FFT) that converts the signal input from the CP removal unit 305 from a time domain signal to a frequency domain signal, and sends the modulation symbol and the reference signal to the propagation path estimation unit 307.
- the control signal is output to the control information detection unit 308.
- the FFT unit 306 may perform other methods such as discrete Fourier transform (DFT: Discrete Fourier Transform) as long as the signal can be converted from the time domain to the frequency domain.
- DFT discrete Fourier transform
- the propagation path estimation unit 307 demaps the reference signal (reference signal for propagation path estimation) included in the signal output from the FFT unit 306, and performs propagation path estimation using the reference signal. Further, propagation path estimation section 307 outputs the estimated propagation path information to propagation path compensation section 309 and reception quality calculation section 312.
- the control information detection unit 308 detects control information included in the signal output from the reception unit 302. In addition, the control information detection unit 308 extracts various information such as resource block allocation information, MCS information, HARQ information, and TPC information included in the control information. Then, the extracted various pieces of information are detected and output to the demodulation unit 310 and the decoding unit 311.
- the propagation path compensation unit 309 is based on the propagation path estimation value input from the propagation path estimation unit 307, such as ZF (Zero Forcing) equalization, MMSE (Minimum Mean Square Error) equalization, etc. Using a method, a weighting factor for correcting propagation path distortion due to fading is calculated, and propagation path compensation is performed on the input modulation symbol.
- ZF Zero Forcing
- MMSE Minimum Mean Square Error
- Demodulation section 310 performs demodulation processing on the signal after propagation path compensation input from propagation path compensation section 309.
- the demodulation process may be either a hard decision (calculation of a coded bit sequence) or a soft decision (calculation of a coded bit LLR).
- the decoding unit 311 performs error correction decoding processing on the demodulated encoded bit sequence (or encoded bit LLR) output from the demodulating unit 310, calculates downlink information data, and performs physical layer control on the downlink information data.
- the decoded information data includes target base station information (step S109 in FIG. 3).
- This error correction decoding method is a method corresponding to error correction coding such as turbo coding and convolution coding performed by a connected base station. Either a hard decision or a soft decision can be applied to the error correction decoding process.
- the decoding unit 311 When the base station transmits interleaved data modulation symbols, the decoding unit 311 performs a deinterleaving process corresponding to the interleaving of the input coded bit sequence before performing the error correction decoding process. Then, the decoding unit 311 performs error correction decoding processing on the signal that has been subjected to deinterleaving processing.
- the reception quality calculation unit 312 calculates the reception quality based on the propagation path information input from the propagation path estimation unit 307 and outputs the reception quality to the physical layer control unit 313.
- the physical layer control unit 313 outputs the input downlink information data (target base station information and the like) and the reception quality to the upper layer 314. In addition, the physical layer control unit 313 generates control information from the reception quality and outputs the control information to the control signal generation unit 321.
- the upper layer 314 uses the data to be transmitted to each base station as uplink information data, and outputs the uplink information data to the data signal generation unit 322.
- the reception quality is included in the uplink information data.
- the reception quality included in the uplink information data is preferably reception quality measured over a long period, and may be newly generated by the upper layer 314 based on the reception quality calculated by the reception quality calculation unit 312. Further, the upper layer 314 outputs the target base station information to the synchronization signal generation unit 303.
- the control signal generation unit 321 performs error correction coding and modulation mapping on the input control information, and generates a control signal.
- the data signal generation unit 322 performs error correction coding and modulation mapping on the input uplink information data, and generates an uplink data signal.
- the signal including the control signal input from the control signal generation unit 321 and the uplink data signal input from the data signal generation unit 322 is D / A converted by the transmission unit 323 and is increased to a frequency band that can be transmitted in the uplink.
- the signal is converted and transmitted to the base station of the connected cell via the transmission antenna unit 324.
- the synchronization signal generation unit 303 generates a synchronization signal based on the input target base station information and outputs the synchronization signal to the synchronization unit 304 (step S110 in FIG. 3). Thereby, in the next reception process, a signal from the base station indicated in the target base station information can be detected (step S111 in FIG. 3), and the connection with the target base station is completed (step in FIG. 3). S112).
- the macro cell base station determines whether or not the handover of the terminal connected to the low power base station is necessary, and the macro cell base station performs the handover procedure, thereby reducing the processing related to the handover in the low power base station,
- the connection destination can be switched efficiently.
- the macro cell base station 100 notifies the handover instruction of the terminal 300 via the source base station. However, in the present embodiment, the macro cell base station 100 notifies the terminal 300 of the handover instruction. .
- the configurations of the communication system, the low-power base station 200-x, and the terminal 300 in this embodiment are the same as those in the first embodiment. In the following, differences from the first embodiment will be mainly described.
- FIG. 7 is a sequence diagram illustrating an example of a processing flow of the communication system according to the second embodiment.
- the macro cell base station 100 issues a handover instruction to the terminal via the source base station (step S107 and step S108 in FIG. 3).
- the macro cell base station 100 directly issues a handover instruction to the terminal (step S201 in FIG. 7).
- the macro cell base station 100 transmits a handover notification to the source base station to notify the source base station that the connection destination of the terminal 300 is changed (step S202 in FIG. 7).
- FIG. 8 is a schematic block diagram illustrating a configuration example of the macro cell base station 100 according to the second embodiment.
- the difference from the macro base station (FIG. 4) in the first embodiment is that in FIG. 8, the target base station determination unit 101-3 outputs the target base station information to the information data generation unit 101-4. is there. Therefore, in this embodiment, the downlink information data generated by the information data generation unit 101-4 is information including target base station information, and the macrocell base station 100 transmits the target base station information to the terminal 300.
- the macro cell base station determines whether or not the handover of the terminal connected to the low power base station is necessary, and the macro cell base station instructs the terminal to perform the handover, thereby performing the processing related to the handover in the low power base station.
- the connection destination can be switched efficiently.
- the macro cell base station 100 determines the handover of the terminal 300, but in this embodiment, the source base station determines the handover of the terminal 300.
- the configurations of the communication system and the terminal 300 in this embodiment are the same as those in the first embodiment. In the following, differences from the first embodiment will be mainly described.
- FIG. 9 is a sequence diagram illustrating an example of a processing flow of the communication system according to the third embodiment.
- the macro cell base station 100 determines whether or not the handover of the terminal 300 is necessary based on the reception quality notified from the terminal 300 (step S103 in FIG. 3).
- the source base station determines whether or not the handover of the terminal 300 is necessary based on the reception quality notified from the terminal 300 (step S301 in FIG. 9), and determines that the source base station performs the handover.
- the source base station notifies the macro cell base station of a handover request (first handover request) (step S302).
- step S102 of this embodiment is the same as that of the first embodiment.
- the terminal 300 may notify the reception quality of the neighboring base station and the source base station to the macro cell base station, and only the reception quality of the own station (source base station) may be sent to the source base station. Alternatively, the reception quality of neighboring base stations may be notified.
- step S301 when the reception quality notified from the terminal 300 is only the reception quality of the source base station, for example, the source base station sets a threshold in advance, and when the reception quality of the source base station is lower than the threshold, It can be determined that 300 handovers are to be performed. On the other hand, when the reception quality of the source base station exceeds the threshold, the macro cell base station 100 can determine that the terminal 300 is not handed over. Further, when the reception quality notified from the terminal 300 is the reception quality of the neighboring base station and the source base station, for example, the source base station compares the reception quality of the neighboring base station and the source base station, and from the source base station If there is a base station with good reception quality, it can be determined that handover is to be performed.
- FIG. 10 is a schematic block diagram illustrating a configuration example of the macro cell base station 100 according to the third embodiment.
- the macro cell base station 100 in the third embodiment is different from the macro base station (FIG. 4) in the first embodiment in the configuration of the upper layer 401.
- the upper layer 401 includes a data processing unit 401-1, a target base station determination unit 401-2, and an information data generation unit 401-3.
- the data processing unit 401-1 performs processing of data acquired by the upper layer 401.
- the data processing unit 401-1 detects reception quality from the uplink information data. Further, the data processing unit 401-1 receives a handover request from the source base station through the backhaul line (step S302 in FIG. 9). When receiving the handover request, the data processing unit 401-1 outputs the reception quality to the target base station determining unit 401-2.
- the target base station determination unit 401-2 determines the target base station based on the reception quality input from the data processing unit 401-1 (step S104 in FIG. 9), and obtains the target base station information from the data processing unit 401- Output to 1.
- the data processing unit 401-1 notifies the target base station of a handover request through the backhaul line (step S 105 in FIG. 9), and receives a handover permission notification from the target base station (step S 106 in FIG. 9).
- step S106 when the notification indicating that the handover is permitted is received, the data processing unit 401-1 notifies the source base station of the target base station information through the backhaul line, and issues a handover instruction (FIG. 9). Step S107).
- FIG. 11 is a schematic block diagram showing a configuration example of the low-power base station 200-x in the third embodiment.
- the low-power base station in the third embodiment is different from the low-power base station (FIG. 5) in the first embodiment in the configuration of the upper layer 501.
- the upper layer 501 includes a data processing unit 501-1, a handover determination unit 501-2, and an information data generation unit 501-3.
- the data processing unit 501-1 outputs the reception quality to the handover determining unit 501-2, and the handover determining unit 501-2 is based on the reception quality input from the data processing unit 501-1. It is determined whether or not the terminal 300 needs to be handed over (step S301 in FIG. 9). If it is determined in step S301 in FIG. 9 that handover is to be performed, the data processing unit 501-1 notifies the macro cell base station 100 of a handover request through the backhaul line (step S302 in FIG. 9). In addition, when the handover instruction is received from the macrocell base station 100 in step S107 of FIG. 9, the data processing unit 501-1 outputs the target base station information included in the handover instruction to the information data generation unit 501-3, The information data generation unit 501-3 uses the target base station information as downlink information data (step S108 in FIG. 9).
- the source base station determines whether or not the handover of the terminal connected to the low power base station is necessary, and the macro cell base station issues a handover instruction to the target base station, so that the handover in the low power base station is performed. It is possible to reduce processing and efficiently switch connection destinations.
- the macro cell base station 100 when the source base station determines whether or not the handover of the terminal connected to the low power base station is necessary, the macro cell base station 100 performs a handover instruction of the terminal 300 via the source base station. However, in this embodiment, the macrocell base station 100 issues a handover instruction to the terminal 300.
- the configurations of the communication system, the low power base station 200-x, and the terminal 300 in this embodiment are the same as those in the third embodiment. In the following, differences from the third embodiment will be mainly described.
- FIG. 12 is a sequence diagram illustrating an example of a processing flow of the communication system according to the fourth embodiment.
- the macro cell base station 100 issues a handover instruction to the terminal via the source base station (step S107 and step S108 in FIG. 9).
- the macro cell base station 100 directly issues a handover instruction to the terminal (step S201 in FIG. 12).
- FIG. 13 is a schematic block diagram illustrating a configuration example of the macro cell base station 100 according to the fourth embodiment.
- the difference from the macro base station (FIG. 10) in the third embodiment is that in FIG. 13, the target base station determination unit 401-2 outputs target base station information to the information data generation unit 401-3. is there. Therefore, in the present embodiment, the downlink information data generated by the information data generation unit 401-3 is information including target base station information, and the macrocell base station 100 transmits the target base station information to the terminal 300.
- the source base station determines whether or not the handover of the terminal connected to the low power base station is necessary, and the macro cell base station instructs the terminal to perform the handover, thereby performing processing related to the handover in the low power base station.
- the connection destination can be switched efficiently.
- a handover inquiry may be used instead of the handover request.
- a handover inquiry is an example of a handover request.
- the first handover inquiry includes a first handover request for changing the connection destination of the terminal and information necessary for changing the connection destination of the terminal.
- the second handover inquiry includes a second handover request for requesting connection of the terminal and information necessary for the terminal to connect.
- Information necessary for changing the connection destination of the terminal is information regarding the terminal such as information for specifying the terminal to be handed over and information indicating the performance of the terminal.
- the program that operates in the base station and the terminal related to the present invention is a program (a program that causes a computer to function) that controls the CPU and the like so as to realize the functions of the above-described embodiments related to the present invention.
- Information handled by these devices is temporarily stored in the RAM at the time of processing, then stored in various ROMs and HDDs, read out by the CPU, and corrected and written as necessary.
- a recording medium for storing the program a semiconductor medium (for example, ROM, nonvolatile memory card, etc.), an optical recording medium (for example, DVD, MO, MD, CD, BD, etc.), a magnetic recording medium (for example, magnetic tape, Any of a flexible disk etc. may be sufficient.
- the processing is performed in cooperation with the operating system or other application programs.
- the functions of the invention may be realized.
- the program when distributing to the market, can be stored and distributed on a portable recording medium, or transferred to a server computer connected via a network such as the Internet.
- the storage device of the server computer is also included in the present invention.
- part or all of the base station and the terminal in the above-described embodiment may be realized as an LSI that is typically an integrated circuit.
- Each functional block of the base station and the terminal may be individually chipped, 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. When each functional block is integrated, an integrated circuit controller for controlling them is added.
- 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.
- the terminal of the present invention is not limited to the above-described embodiment.
- the terminal of the present invention is not limited to application to a mobile station device, but is a stationary or non-movable electronic device installed indoors or outdoors, such as AV equipment, kitchen equipment, cleaning / washing equipment, Needless to say, it can be applied to air-conditioning equipment, office equipment, vending machines, and other daily life equipment.
- the present invention is suitable for use in base stations and terminals.
Abstract
Description
本願は、2012年11月1日に、日本に出願された特願2012-241503号に基づき優先権を主張し、その内容をここに援用する。
(2)本発明の一態様による第一の基地局は、上記の第一の基地局であって、前記端末の接続先を変更することを求める第一のハンドオーバ要求があった場合、前記受信品質に基づいて、前記端末の新たな接続先である第三の基地局を決定するように構成されてもよい。
(3)本発明の一態様による第一の基地局は、上記の第一の基地局であって、前記受信品質に基づいて、前記第一のハンドオーバ要求をするように構成されてもよい。
(4)本発明の一態様による第一の基地局は、上記の第一の基地局であって、前記第一のハンドオーバ要求は、前記第二の基地局から通知されてもよい。
(5)本発明の一態様による第一の基地局は、上記の第一の基地局であって、前記第一のハンドオーバ要求は、端末の接続先を変更するために必要な情報を含む第一のハンドオーバ照会であってもよい。
(6)本発明の一態様による第一の基地局は、上記の第一の基地局であって、前記第三の基地局に、前記端末の接続を求める第二のハンドオーバ要求を通知するように構成されてもよい。
(7)本発明の一態様による第一の基地局は、上記の第一の基地局であって、前記第三の基地局から、前記第二のハンドオーバ要求に対する応答を受信するように構成されてもよい。
(8)本発明の一態様による第一の基地局は、上記の第一の基地局であって、前記第二のハンドオーバ要求に対する応答がACKであった場合、前記端末に前記第三の基地局に接続することを指示すると共に、前記第三の基地局の情報であるターゲット基地局情報を前記端末に通知するように構成されてもよい。
(9)本発明の一態様による第一の基地局は、上記の第一の基地局であって、前記第二のハンドオーバ要求に対する応答がACKであった場合、前記第二の基地局に前記端末が前記第三の基地局に接続するように指示するように構成されてもよい。
(10)本発明の一態様による第一の基地局は、上記の第一の基地局であって、前記第二のハンドオーバ要求は、端末が接続するために必要な情報を含む第二のハンドオーバ照会であってもよい。
(11)本発明の一態様による第二の基地局は、第一の基地局と、第二の基地局と、該第二の基地局と接続する少なくとも1つの端末とを備える通信システムの第二の基地局であって、前記端末の接続先を変更すべきかどうかを判断し、変更すべきと判断した場合、前記第一の基地局に第一のハンドオーバ要求を通知する。
(12)本発明の一態様による第二の基地局は、上記の第二の基地局であって、前記第一の基地局から、前記端末が第三の基地局に接続する旨の通知を受信し、前記端末に前記第三の基地局への接続指示を通知すると共に、前記第三の基地局の情報を前記端末に通知するように構成されてもよい。
(13)本発明の一態様による第二の基地局は、上記の第二の基地局であって、前記第一のハンドオーバ要求は、端末の接続先を変更するために必要な情報を含む第一のハンドオーバ照会であってもよい。
(14)本発明の一態様による端末は、第一の基地局と、第二の基地局と、該第二の基地局と接続する少なくとも1つの端末とを備える通信システムの端末であって、
前記第二の基地局および前記第二の基地局の周辺に位置する周辺基地局に対する前記端末の受信品質に関する情報を前記第一の基地局に通知する。
(15)本発明の一態様による端末は、上記の端末であって、前記第一の基地局または前記第二の基地局の少なくとも1つから、新たな接続先である第三の基地局の情報を受信し、該第三の基地局の情報を用いて前記第三の基地局との通信を開始するように構成されてもよい。
(第1の実施形態)
(第2の実施形態)
(第3の実施形態)
(第4の実施形態)
100 マクロセル基地局
20-1、20-2、20-3、20-4 スモールセル
200-1、200-2、200-3、200-4 小電力基地局
300 端末
101、201、401、501 上位レイヤ
101-1、201-1、401-1、501-1 データ処理部
101-2、501-2 ハンドオーバ判定部
101-3、401-2 ターゲット基地局決定部
101-4、201-2、401-3、501-3 情報データ生成部
102 物理レイヤ制御部
103 符号化部
104 変調部
105 参照信号生成部
106 制御信号生成部
107 同期信号生成部
108 リソースマッピング部
109 IFFT部
110 CP挿入部
111 送信部
112 送信アンテナ部
121 受信アンテナ部
122 受信部
123 制御情報検出部
124 情報データ検出部
301 受信アンテナ部
302 受信部
303 同期信号生成部
304 同期部
305 CP除去部
306 FFT部
307 伝搬路推定部
308 制御情報検出部
309 伝搬路補償部
310 復調部
311 復号部
312 受信品質算出部
313 物理レイヤ制御部
314 上位レイヤ
321 制御信号生成部
322 データ信号生成部
323 送信部
324 送信アンテナ部
Claims (15)
- 第一の基地局と、第二の基地局と、該第二の基地局と接続する少なくとも1つの端末とを備える通信システムの第一の基地局であって、
前記第二の基地局および前記第二の基地局の周辺に位置する周辺基地局に対する前記端末の受信品質に関する情報を前記端末から受信する第一の基地局。 - 前記端末の接続先を変更することを求める第一のハンドオーバ要求があった場合、前記受信品質に基づいて、前記端末の新たな接続先である第三の基地局を決定する請求項1に記載の第一の基地局。
- 前記受信品質に基づいて、前記第一のハンドオーバ要求をする請求項2に記載の第一の基地局。
- 前記第一のハンドオーバ要求は、前記第二の基地局から通知される請求項2に記載の第一の基地局。
- 前記第一のハンドオーバ要求は、端末の接続先を変更するために必要な情報を含む第一のハンドオーバ照会である請求項4に記載の第一の基地局。
- 前記第三の基地局に、前記端末の接続を求める第二のハンドオーバ要求を通知する請求項2に記載の第一の基地局。
- 前記第三の基地局から、前記第二のハンドオーバ要求に対する応答を受信する請求項6に記載の第一の基地局。
- 前記第二のハンドオーバ要求に対する応答がACKであった場合、前記端末に前記第三の基地局に接続することを指示すると共に、前記第三の基地局の情報であるターゲット基地局情報を前記端末に通知する請求項7に記載の第一の基地局。
- 前記第二のハンドオーバ要求に対する応答がACKであった場合、前記第二の基地局に前記端末が前記第三の基地局に接続するように指示する請求項7に記載の第一の基地局。
- 前記第二のハンドオーバ要求は、端末が接続するために必要な情報を含む第二のハンドオーバ照会であることを特徴とする請求項9に記載の第一の基地局。
- 第一の基地局と、第二の基地局と、該第二の基地局と接続する少なくとも1つの端末とを備える通信システムの第二の基地局であって、
前記端末の接続先を変更すべきかどうかを判断し、変更すべきと判断した場合、前記第一の基地局に第一のハンドオーバ要求を通知する第二の基地局。 - 前記第一のハンドオーバ要求は、端末の接続先を変更するために必要な情報を含む第一のハンドオーバ照会である請求項11に記載の第二の基地局。
- 前記第一の基地局から、前記端末が第三の基地局に接続する旨の通知を受信し、前記端末に前記第三の基地局への接続指示を通知すると共に、前記第三の基地局の情報を前記端末に通知する請求項11に記載の第二の基地局。
- 第一の基地局と、第二の基地局と、該第二の基地局と接続する少なくとも1つの端末とを備える通信システムの端末であって、
前記第二の基地局および前記第二の基地局の周辺に位置する周辺基地局に対する前記端末の受信品質に関する情報を前記第一の基地局に通知する端末。 - 前記第一の基地局または前記第二の基地局の少なくとも1つから、新たな接続先である第三の基地局の情報を受信し、該第三の基地局の情報を用いて前記第三の基地局との通信を開始する請求項14に記載の端末。
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WO2011114079A1 (en) * | 2010-03-19 | 2011-09-22 | Fujitsu Limited | Cell selection for multi-cell mimo transmission |
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- 2013-10-31 WO PCT/JP2013/079606 patent/WO2014069590A1/ja active Application Filing
- 2013-10-31 JP JP2014544589A patent/JPWO2014069590A1/ja active Pending
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WO2011114079A1 (en) * | 2010-03-19 | 2011-09-22 | Fujitsu Limited | Cell selection for multi-cell mimo transmission |
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US20150296417A1 (en) | 2015-10-15 |
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