WO2015019825A1 - ユーザ端末、基地局及び無線通信方法 - Google Patents

ユーザ端末、基地局及び無線通信方法 Download PDF

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Publication number
WO2015019825A1
WO2015019825A1 PCT/JP2014/069146 JP2014069146W WO2015019825A1 WO 2015019825 A1 WO2015019825 A1 WO 2015019825A1 JP 2014069146 W JP2014069146 W JP 2014069146W WO 2015019825 A1 WO2015019825 A1 WO 2015019825A1
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Prior art keywords
base station
user terminal
detection
cell
small
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Ceased
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PCT/JP2014/069146
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English (en)
French (fr)
Japanese (ja)
Inventor
和晃 武田
浩樹 原田
石井　啓之
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NTT Docomo Inc
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NTT Docomo Inc
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Priority to EP14833978.1A priority Critical patent/EP3032890A4/en
Priority to CN201480045375.8A priority patent/CN105453663A/zh
Priority to US14/910,318 priority patent/US10154479B2/en
Publication of WO2015019825A1 publication Critical patent/WO2015019825A1/ja
Anticipated expiration legal-status Critical
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W48/00—Access restriction; Network selection; Access point selection
    • H04W48/16—Discovering, processing access restriction or access information
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/20—Control channels or signalling for resource management
    • H04W72/23—Control channels or signalling for resource management in the downlink direction of a wireless link, i.e. towards a terminal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B17/00—Monitoring; Testing
    • H04B17/30—Monitoring; Testing of propagation channels
    • H04B17/309—Measuring or estimating channel quality parameters
    • H04B17/318—Received signal strength
    • H04B17/328—Reference signal received power [RSRP]; Reference signal received quality [RSRQ]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
    • H04W16/24—Cell structures
    • H04W16/32—Hierarchical cell structures
    • 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
    • H04W72/00—Local resource management
    • H04W72/20—Control channels or signalling for resource management
    • H04W72/21—Control channels or signalling for resource management in the uplink direction of a wireless link, i.e. towards the network
    • 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
    • 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 base station, a user terminal, and a radio communication method in a next generation mobile communication system.
  • LTE Long Term Evolution
  • OFDMA Orthogonal Frequency Division Multiple Access
  • SC-FDMA Single Carrier Frequency Division Multiple Access
  • LTE-A LTE advanced or LTE enhancement
  • a small cell eg, a pico cell, a femto cell, etc.
  • a macro cell having a wide coverage area with a radius of several kilometers.
  • Heterogeneous Network is being studied (for example, Non-Patent Document 2).
  • HetNet use of carriers in different frequency bands as well as in the same frequency band between a macro cell (macro base station) and a small cell (small base station) is being studied.
  • 3GPP TS 36.300 “Evolved UTRA and Evolved UTRAN Overall description”
  • 3GPP TR 36.814 E-UTRA further advancements for E-UTRA physical layer aspects”
  • HetNet it is assumed that a large number of small cells are arranged in a macro cell. In this case, it is assumed that a small cell is locally arranged in a place with a large traffic to achieve an offload effect between cells.
  • signal transmission from a small cell (small base station) having a low traffic load among a plurality of small cells is stopped, and an off state (or (DTX state) is desirable.
  • the transition from the on state to the off state may be determined by observing the traffic of the small cell on the network side.
  • the transition from the off state to the on state needs to be controlled by appropriately determining that traffic is generated in the small cell area in the off state.
  • the DL signal reference signal, data signal, etc.
  • the present invention has been made in view of this point, and wireless communication capable of appropriately controlling on / off of a small cell (small base station) in a configuration in which a small cell and a macro cell are overlapped.
  • the object is to provide a method, a user terminal and a base station.
  • One aspect of the user terminal according to the present invention is a user terminal capable of communicating with a macro base station that forms a macro cell and a small base station that forms a small cell arranged in the macro cell, and the small base is configured in a predetermined subframe.
  • a transmitter that transmits information related to the reception quality to the macro base station, and the calculation unit includes the received power and the received power in the total received power.
  • the reception quality is calculated on the basis of the ratio of the value obtained by adding
  • a small cell small base station
  • a small cell and a macro cell are overlapped.
  • HetNet HetNet
  • movement procedure of on / off control of a small cell It is a figure explaining an example of DL signal transmitted from a small cell.
  • DL signal transmitted to each sub-frame from a some small cell It is the schematic which shows an example of the radio
  • FIG. 1 shows Rel. It is a conceptual diagram of HetNet assumed in 12 or later.
  • HetNet is a wireless communication system in which at least a part of a macro cell and a small cell is geographically overlapped.
  • HetNet is a radio base station that forms a macro cell (hereinafter referred to as a macro base station), a radio base station that forms a small cell (hereinafter referred to as a small base station), and a user terminal that communicates with the macro base station and the small base station. It is comprised including.
  • a relatively low frequency band carrier such as 800 MHz or 2 GHz
  • a relatively high frequency band carrier hereinafter, referred to as a high frequency band carrier
  • 800 MHz, 2 GHz, and 3.5 GHz are just examples.
  • 3.5 GHz may be used, and as a carrier of the small cell S, 800 MHz, 2 GHz, 800 MHz, 2 GHz, 1.7 GHz, or the like may be used.
  • the user distribution and traffic are not uniform and fluctuate in time or location. For this reason, when a large number of small cells are arranged in a macro cell, it is assumed that the small cells are arranged in different forms (Sparse and Dense) depending on the location as shown in FIG. .
  • the small base station that has shifted to the off state does not transmit a DL signal (for example, a cell-specific reference signal (CRS)) or the like, it is possible to reduce interference on adjacent small cells. Further, by turning off a small base station having a low traffic load (for example, no traffic), it is possible to reduce power consumption (energy saving).
  • a DL signal for example, a cell-specific reference signal (CRS)
  • CRS cell-specific reference signal
  • the transition from the on state to the off state may be determined by observing traffic on the network side.
  • the transition from the off state to the on state needs to be performed by recognizing that traffic is generated in the small cell in the off state.
  • the DL signal reference signal, data signal, etc.
  • the present inventors have transmitted a specific DL signal (also referred to as a detection / measurement signal, Discovery signal) from a small cell in the off state (including the DTX state). Therefore, a method of making a determination based on the detection / measurement result of the DL signal in the user terminal is being studied. Specifically, a user terminal that has received a detection / measurement signal (Discovery signal) from a small cell measures the reception state of the detection / measurement signal and reports it to a network (for example, a macro base station). Then, the macro base station determines whether to shift the small cell to the on state based on the measurement result (measurement result).
  • a detection / measurement signal Discovery signal
  • a small base station (small cell) is in an off state is a state in which a UL signal can be received from a user terminal and a detection / measurement signal for measurement is transmitted in a long cycle. Point to. That is, the off state includes the DTX state. Further, the small base station being in an ON state indicates a state in which communication is performed in the same manner as an existing base station (Legacy Carrier). That is, the small base station in the on state transmits a DL reference signal such as a cell-specific reference signal (CRS), a data signal, and a control signal for each subframe.
  • CRS cell-specific reference signal
  • the small base station in the DTX state transmits a DL signal only for a predetermined period (for example, Nms) at a predetermined period (for example, Lms) instead of for each subframe (see FIG. 3D).
  • DTX state an off state
  • a small cell with no traffic is set to an off state (DTX state) based on the judgment of a network (for example, a macro base station).
  • Information can be transmitted and received between the macro base station and the small base station via a backhaul link (such as an optical fiber or X2 signaling).
  • the small cell in the on state transmits a cell-specific reference signal (CRS) or the like even when there is no traffic, and thus becomes an interference source of an adjacent cell. Therefore, by setting a small cell that has no traffic and does not require DL transmission to an off state (DTX state), it is possible to suppress interference on adjacent cells and reduce power consumption.
  • CRS cell-specific reference signal
  • 3A to 3B show a case where the small base stations B and D are shifted to the off state (DTX state).
  • the small base station that has shifted to the off state (DTX state) transmits a detection / measurement signal (Discovery signal) in a long cycle (see FIG. 3B).
  • the user terminal detects a detection / measurement signal
  • the user terminal measures a reception state for the signal, and sends a measurement result (measurement result) to a network (for example, a macro base station) as a measurement report (MR: Measurement Report).
  • a network for example, a macro base station
  • MR Measurement Report
  • detection / measurement signals are transmitted from the small base stations B and D in the DTX state.
  • detection / measurement signals are transmitted from the small base stations B and D for a predetermined period (for example, Nms) every predetermined period (for example, Lms).
  • the macro base station determines whether or not to shift the small base station in the DTX state to the on state based on the MR reported from the user terminal (see FIG. 3C).
  • FIG. 3C shows a case where the small base station B shifts from the DTX state to the on state.
  • the orthogonality between the detection / measurement signals transmitted by each small cell is high, the transmission cycle is long, the transmission time is short, and the resource density is sufficiently high (see FIG. 4A).
  • the resource density of the detection / measurement signal is high, the user terminal can perform detection / measurement with high accuracy during one transmission time.
  • a sufficiently high resource density includes a signal that is allocated in a wide band and can suppress the influence of fading.
  • FIG. 4A the detection / measurement signal is transmitted from the small base station in the DTX state in a predetermined subframe.
  • FIG. 4B shows an example of an arrangement pattern of DL signals (cell-specific reference signals (CRS) and synchronization signals (SS) in FIG. 4B) transmitted from the small base station in the on state.
  • CRS cell-specific reference signals
  • SS synchronization signals
  • the user terminal detects / measures a detection / measurement signal (Discovery signal) transmitted from the DTX small cell, thereby recognizing the DTX small cell, measuring the reception quality, and reporting the measurement result.
  • a detection / measurement signal (Discovery signal) transmitted from the DTX small cell
  • the network for example, the macro base station
  • RSRP received power
  • RSRQ received quality
  • MR measurement result report
  • RSRP corresponds to the received power of a reference signal of a measurement target cell (for example, a specific small cell).
  • RSRQ corresponds to a ratio (ratio) between RSRP and the total received power (RSSI) of a user terminal in a certain subframe.
  • the lower the total received power (the band is not congested) the higher the RSRQ.
  • Equation (1) shows a case where a CRS of one antenna port is assumed and 1 RB is considered as a reference (normalized by 1 RB).
  • Formula (1) is an example, and the present embodiment is not limited to this.
  • the existing system stipulates that RSRP and RSRQ (RSSI) are measured in a subframe including a cell-specific reference signal (CRS). Therefore, for detection / measurement of a detection / measurement signal (Discovery signal), RSRP and RSRQ (RSSI) are obtained in the same manner as in an existing system by using a subframe including the detection / measurement signal instead of CRS. Can be considered.
  • the RSSI value is close to zero if many of the neighboring cells of the user terminal are off or are small cells in the DTX state.
  • RSRQ is calculated by the ratio of the RSSI and RSRQ, the RSRQ value diverges, making it difficult to calculate accurate reception quality.
  • the present inventors consider both received power (RSRP) in a subframe in which a detection / measurement signal is transmitted and total received power (RSSI) in a subframe in which a detection / measurement signal is not transmitted. The idea was to calculate the quality (RSRQ) accurately. Further, the present inventors report the received SINR for the detection / measurement signal from the user terminal to the macro base station, and the macro base station side controls on / off of the small cell based on the SINR and the buffer amount. Inspired. Thereby, on / off of a small cell (small base station) can be appropriately controlled in consideration of traffic in a small cell area in an off state (DTX state).
  • DTX state off state
  • reception quality (RSRQ) is determined in consideration of both a period during which a detection / measurement signal (Discovery signal) is transmitted and a period during which no detection / measurement signal is transmitted.
  • Discovery signal detection / measurement signal
  • FIG. 5 is a diagram illustrating an example of DL signals transmitted from a small base station (Cell # 1) in an off state (DTX state) and a small base station (Cell # 2) in an on state in each subframe. .
  • a small base station Cell # 1 in an off state (DTX state)
  • Cell # 2 Cell # 2 in an on state in each subframe.
  • the user terminal measures received power (RSRP) using the detection / measurement signal.
  • RSRP received power
  • the received power of the detection / measurement signal transmitted from the small cell (Cell # 1) in subframe 0 (SF # 0) is measured.
  • SF # 0 subframe 0
  • CRS reference signal
  • CRS data signal
  • the user terminal measures the total received power (RSSI) in the subframe in which the detection / measurement signal is not transmitted.
  • RSSI total received power
  • SF # 1 the total received power of the DL signal transmitted from each small cell (Cell # 1, Cell # 2) is measured.
  • a reference signal (CRS), a data signal, and the like are transmitted from neighboring cell 2 (Cell # 2), but from a small cell in DTX state (for example, Cell # 1). No signal is transmitted.
  • FIG. 5 shows the case where the user terminal measures the total received power (RSSI) in subframe 1 (SF # 1), but the subframe in which RSSI is measured is not limited to this.
  • the user terminal may measure RSSI in other subframes (for example, SF # 2 and SF # 3) in which the detection / measurement signal is not transmitted.
  • the user terminal that has measured the RSRP in SF # 0 and the RSSI in SF # 1 obtains the reception quality (RSRQ) using the RSRP and RSSI.
  • RSRQ is calculated using RSRP and RSSI so as to have the same form as RSRQ using existing CRS, and is reported to the network (for example, a macro base station).
  • the user terminal determines the RSRP for the received power (RSRP DS ) of the subframe in which the detection / measurement signal is transmitted and the total received power (RSSI) of the subframe in which the detection / measurement signal is not transmitted.
  • Equation (2) shows a case where CRS of one antenna port is assumed and is considered based on 1 RB (normalized with 1 RB).
  • Expression (2) is an example, and the present embodiment is not limited to this.
  • Equation (2) 10 ⁇ load S ⁇ S Data_subframe + 2 ⁇ I + 10 ⁇ Load I ⁇ I + 12 ⁇ N” in the denominator of Equation (2) is the RSSI actually measured by the user terminal in subframe 1 (SF # 1) in FIG. It corresponds to the theoretical formula of “2 ⁇ S DS_subframe ” corresponds to received power (RSRP) when CRS is assumed from Cell # 1 in SF # 1. That is, in the above equation (2), assuming that CRS (CRS of 2 resource elements in 1 RB) is transmitted from the target cell in the DTX state in SF # 1, the RSSI actually measured in SF # 1 is assumed. On the other hand, the reception power of the detection / measurement signal is added.
  • RSRP received power
  • the macro base station can appropriately determine whether or not to shift the small base station in the DTX state to the on state based on RSRQ or the like reported from the user terminal.
  • the user terminal uses the received power (RSRP) of the subframe in which the detection / measurement signal is transmitted and the total received power (RSSI) of the subframe in which the detection / measurement signal is not transmitted.
  • RSRP received power
  • RSSI total received power
  • the case where the reception quality (RSRQ) is obtained and reported to the macro base station is shown.
  • the present embodiment is not limited to this, and information regarding the total received power (RSSI) itself may be reported from the user terminal to the macro base station as an MR.
  • the user terminal transmits the information regarding the RSRP measured in subframe 0 (SF # 0) in FIG. 5 and the RSSI measured in any of subframes 1 to 3 (SF # 1 to # 3) to the macro base station.
  • the macro base station performs on / off control (transition from the off state (DTX state) to the on state) using RSRP and RSSI reported from the user terminal.
  • the macro base station can flexibly generate a metric using the RSRP and RSSI acquired from the user terminal, and control small cell on / off using the metric.
  • the RSRQ as shown in the above formula (2) can be obtained on the macro base station side.
  • a new metric (see the following formula (3)) is generated in the macro base station, and it can be determined whether or not to turn on the small base station in the DTX state.
  • RSRQ is calculated using different methods for the small cell on state or off state.
  • the network may notify the user terminal of information (measurement switching information) for switching a plurality of measurements (measurements) by an upper layer signal or a broadcast signal.
  • information for switching RSRQ calculation formulas may be notified as measurement switching information.
  • the network may notify the user terminal of information regarding whether or not RSRP is included in the denominator of the RSRQ calculation formula.
  • the measurement switching information may be information that directly indicates the measurement method, or when the user terminal stores a plurality of measurement methods in advance, information that indirectly indicates the measurement method (corresponding to the measurement method) Numerical value).
  • the user terminal can appropriately obtain the RSRQ in consideration of the influence of the reference signal such as CRS by switching the measurement based on the measurement switching information.
  • the user terminal can calculate RSRQ by including RSRP in the denominator of the RSRQ calculation formula based on the measurement switching information.
  • the user terminal obtains SINR (Signal to Interference plus Noise power Ratio) using a detection / measurement signal and reports the SINR as MR to a network (for example, a macro base station).
  • SINR Signal to Interference plus Noise power Ratio
  • the user terminal measures the received SINR of the detection / measurement signal in the subframe in which the detection / measurement signal is transmitted. For example, the reception SINR of the detection / measurement signal transmitted from the small cell (Cell # 1) is measured in the subframe 0 (SF # 0) of FIG. By using the detection / measurement signal, highly accurate SINR can be obtained. Further, the user terminal reports the measured SINR as MR to the network (macro base station).
  • the macro base station performs on / off control of the small base station in the DTX state in consideration of the SINR notified from the user terminal. At this time, the macro base station considers the amount of data remaining in the small cells connected by the backhaul (hereinafter also referred to as “buffer amount”).
  • the buffer amount is the amount of data transmitted to the user terminal, and traffic can be appropriately taken into account using the buffer amount.
  • the macro base station determines to turn on the small cell when the traffic situation is congested.
  • the macro base station selects a small base station having a SINR equal to or greater than a predetermined value and having a small buffer amount for the user terminal that has reported the SINR for the detection / measurement signal, and shifts it to the ON state.
  • the macro base station appropriately considers traffic in the small cell area in the off state (DTX state) by using the reception SINR of the detection / measurement signal notified from the user terminal and the buffer amount of the small cell.
  • DTX state the off state
  • the macro base station appropriately considers traffic in the small cell area in the off state (DTX state) by using the reception SINR of the detection / measurement signal notified from the user terminal and the buffer amount of the small cell.
  • the user terminal measures RSRP using the detection / measurement signal corresponding to the measurement target cell in the subframe in which the detection / measurement signal is transmitted.
  • the user terminal may measure RSSI using an OFDM symbol that does not include any detection / measurement signal among the subframes in which the detection / measurement signal is transmitted. RSSI may be measured in a subframe that is not transmitted.
  • the degree of congestion of the band can be appropriately reflected. Further, even when many of the neighboring cells of the user terminal are small cells in the DTX state, the denominator of the theoretical formula (4) is suppressed from being very close to zero, and the value of RSRQ can be obtained appropriately.
  • the theoretical formula (4) is an example, and the RSRQ calculation formula is not limited to this.
  • FIG. 11 is a diagram illustrating an example of DL signals transmitted from a plurality of small cells in a predetermined subframe.
  • FIG. 11 shows 1 RB (resource block) which is the minimum unit of radio resources for performing frequency scheduling.
  • the reference signal for example, CRS
  • CRS CRS
  • a synchronization signal for example, PSS
  • the detection / measurement signal (DS) of the non-measurement target cell is arranged on the eleventh subcarrier of the seventh and eighth symbols.
  • the detection / measurement signal (DS) of the measurement target cell is arranged on the eleventh subcarrier of the ninth and tenth symbols.
  • the user terminal measures RSRP using the DS of the measurement target cell. Further, the user terminal can measure RSSI with symbols (0-5th and 11-13th symbols) that do not include any DS of the measurement target cell and the non-measurement target cell. Note that the sixth symbol including the synchronization signal may be included in the RSSI measurement, and the RSSI may be measured with the 0-6th and 11th-13th symbols.
  • the user terminal measures RSRP with the detection / measurement signal corresponding to the measurement target cell among the subframes in which the detection / measurement signal is transmitted, while the user frame of the subframe in which the detection / measurement signal is transmitted.
  • the RSSI may be obtained for all OFDM symbols.
  • the network uses information for switching measurement (measurement switching information) by an upper layer signal or a broadcast signal. ) May be notified to the user terminal. For example, information for switching the RSRQ calculation formula may be notified.
  • the user terminal may be configured to determine whether to perform measurement using the detection / measurement signal in units of subframes or in units of symbols based on the measurement switching information.
  • the integer values of the constants included in the denominators of the theoretical formulas (1), (2), and (4) depend on the number of antenna ports.
  • an expression may be used in which the number of subcarriers of a reference signal (for example, CRS) allocated to one symbol in 1 RB (12 subcarriers) is a.
  • FIG. 6 is a schematic configuration diagram of the radio communication system according to the present embodiment.
  • the radio communication system 1 includes a macro base station 11 that forms a macro cell C1, and small base stations 12a and 12b that are arranged in the macro cell C1 and form a small cell C2 that is narrower than the macro cell C1.
  • the user terminal 20 is configured to be able to wirelessly communicate with at least one of the macro base station 11 and the small base stations 12a and 12b (hereinafter collectively referred to as the small base station 12).
  • the numbers of macro base stations 11 and small base stations 12 are not limited to the numbers shown in FIG.
  • the same frequency band may be used, or different frequency bands may be used.
  • the macro base station 11 and each small base station 12 are connected to each other via an inter-base station interface (for example, an optical fiber or an X2 interface).
  • the macro base station 11 and each small base station 12 are connected to the higher station apparatus 30 and connected to the core network 40 via the higher station apparatus 30.
  • the upper station device 30 includes, for example, an access gateway device, a radio network controller (RNC), a mobility management entity (MME), and the like, but is not limited thereto.
  • RNC radio network controller
  • MME mobility management entity
  • the macro base station 11 is a radio base station having a relatively wide coverage, and may be referred to as an eNodeB (eNB), a radio base station, a transmission point, or the like.
  • the small base station 12 is a radio base station having local coverage, and is called an RRH (Remote Radio Head), a pico base station, a femto base station, a HeNB (Home eNodeB), a transmission point, an eNodeB (eNB), or the like. May be.
  • the user terminal 20 is a terminal that supports various communication schemes such as LTE and LTE-A, and may include not only a mobile communication terminal but also a fixed communication terminal.
  • OFDMA Orthogonal Frequency Division Multiple Access
  • SC-FDMA Single Carrier Frequency Division Multiple Access
  • a downlink shared channel (PDSCH: Physical Downlink Shared Channel) shared by each user terminal 20, a downlink control channel (PDCCH: Physical Downlink Control Channel, EPDCCH: Enhanced Physical Downlink). Control Channel), PCFICH, PHICH, broadcast channel (PBCH), etc. are used.
  • PDSCH Physical Downlink Shared Channel
  • PDCCH Physical Downlink Control Channel
  • EPDCCH Enhanced Physical Downlink
  • Control Channel PCFICH, PHICH, broadcast channel (PBCH), etc.
  • DCI Downlink control information
  • an uplink shared channel (PUSCH: Physical Uplink Shared Channel) shared by each user terminal 20 and an uplink control channel (PUCCH: Physical Uplink Control Channel) are used as uplink communication channels. It is done. User data and higher layer control information are transmitted by PUSCH. Also, downlink radio quality information (CQI: Channel Quality Indicator), delivery confirmation information (ACK / NACK), and the like are transmitted by PUCCH.
  • PUSCH Physical Uplink Shared Channel
  • PUCCH Physical Uplink Control Channel
  • radio base station 10 when the macro base station 11 and the small base station 12 are not distinguished, they are collectively referred to as a radio base station 10.
  • FIG. 7 is an overall configuration diagram of the radio base station 10 according to the present embodiment.
  • the radio base station 10 includes a plurality of transmission / reception antennas 101 for MIMO transmission, an amplifier unit 102, a transmission / reception unit 103, a baseband signal processing unit 104, a call processing unit 105, and an interface unit 106. .
  • User data transmitted from the radio base station 10 to the user terminal 20 via the downlink is input from the higher station apparatus 30 to the baseband signal processing unit 104 via the interface unit 106.
  • the baseband signal processing unit 104 performs PDCP layer processing, user data division / combination, RLC layer transmission processing such as RLC (Radio Link Control) retransmission control transmission processing, MAC (Medium Access Control) retransmission control, for example, HARQ transmission processing, scheduling, transmission format selection, channel coding, Inverse Fast Fourier Transform (IFFT) processing, and precoding processing are performed and transferred to each transceiver 103.
  • RLC layer transmission processing such as RLC (Radio Link Control) retransmission control transmission processing, MAC (Medium Access Control) retransmission control, for example, HARQ transmission processing, scheduling, transmission format selection, channel coding, Inverse Fast Fourier Transform (IFFT) processing, and precoding processing are performed and transferred to each transceiver 103.
  • RLC layer transmission processing such as RLC (Radio Link Control) retransmission control transmission processing, MAC (Medium Access Control) retransmission control, for example, HARQ transmission processing, scheduling, transmission format selection, channel coding, Inverse
  • Each transmitting / receiving unit 103 converts the downlink signal output by precoding from the baseband signal processing unit 104 for each antenna to a radio frequency band.
  • the amplifier unit 102 amplifies the frequency-converted radio frequency signal and transmits the amplified signal using the transmission / reception antenna 101.
  • the radio frequency signal received by each transmitting / receiving antenna 101 is amplified by the amplifier unit 102, frequency-converted by each transmitting / receiving unit 103, converted into a baseband signal, and sent to the baseband signal processing unit 104. Entered.
  • the baseband signal processing unit 104 performs FFT processing, IDFT processing, error correction decoding, MAC retransmission control reception processing, RLC layer, and PDCP layer reception processing on user data included in the input uplink signal.
  • the data is transferred to the higher station apparatus 30 via the interface unit 106.
  • the call processing unit 105 performs call processing such as communication channel setting and release, status management of the radio base station 10, and radio resource management.
  • the interface unit 106 transmits and receives signals (backhaul signaling) to and from an adjacent base station via an inter-base station interface (for example, optical fiber, X2 interface). For example, data transmission / reception between the macro base station 11 and the small base station 12 is performed via the interface unit 106. Alternatively, the interface unit 106 transmits and receives signals to and from the higher station apparatus 30 via a predetermined interface.
  • an inter-base station interface for example, optical fiber, X2 interface.
  • FIG. 8 is a functional configuration diagram of the macro base station 11 according to the present embodiment.
  • the following functional configuration is configured by the baseband signal processing unit 104 included in the macro base station 11 and the like.
  • the macro base station 11 includes a UE reception state acquisition unit 301, a reception quality calculation unit 302, an on / off determination unit 303, a scheduler 304, and a DL signal generation unit 305.
  • the UE reception state acquisition unit 301 acquires information (MR) regarding the reception state of the user terminal 20 with respect to the detection / measurement signal (Discovery signal).
  • the MR is reported from the user terminal 20 that has received the detection / measurement signal (Discovery signal) transmitted from the small base station 12.
  • the UE reception state acquisition unit 301 acquires information on the reception power (RSRP) and reception quality (RSRQ) of the detection / measurement signal detected / measured by the user terminal 20 from the user terminal 20 (the first first) Embodiment).
  • the UE reception state acquisition unit 301 When the user terminal 20 feeds back information on the total received power (RSSI) of the subframe in which the detection / measurement signal is not transmitted (modified example of the first aspect), the UE reception state acquisition unit 301 And the received power (RSRP) of the detection / measurement signal. Also, when the user terminal 20 reports the reception SINR of the detection / measurement signal (second aspect), the UE reception state acquisition unit 301 receives the SINR from each user terminal 20.
  • RSSI total received power
  • RSRP received power
  • the reception quality calculation unit 302 calculates the reception quality of each user terminal 20 with respect to the detection / measurement signal based on the information acquired by the UE reception state acquisition unit 301. For example, when the user terminal 20 reports information on the received power (RSRP) of the detection / measurement signal and the total received power (RSSI) of a subframe in which the detection / measurement signal is not transmitted (the first aspect described above) 1), the reception quality calculation unit 302 calculates reception quality (RSRQ) using the RSRP and RSSI.
  • RSRP received power
  • RSSI total received power
  • the reception quality calculation unit 302 receives the reception quality (RSRQ) based on the ratio (ratio) of the reception power (RSRP) and the total reception power (RSSI) plus the reception power (RSRP). ) Is calculated.
  • the RSRQ calculated by the reception quality calculation unit 302 can be expressed by the above equation (2).
  • the reception quality calculation unit 302 may generate a new metric using RSRP and RSSI received from the user terminal 20.
  • the reception quality calculation unit 302 can use the above equation (3).
  • the result calculated by reception quality calculation section 302 is output to on / off determination section 303.
  • the process in the reception quality calculation part 302 can be abbreviate
  • the on / off determination unit 303 controls on / off of the small base station based on the information output from the UE reception state acquisition unit 301 and / or the reception quality calculation unit 302. For example, the on / off determination unit 303 determines to shift the small base station in the off state (DTX state) to the on state, and notifies the small base station via the interface unit 106.
  • DTX state off state
  • the on / off determination unit 303 when there are a plurality of user terminals 20 whose reception quality (RSRQ) of the detection / measurement signal is equal to or higher than a predetermined value, transmits the small base to which the detection / measurement signal is transmitted.
  • the station is turned on.
  • the on / off determination unit 303 selects a small base station having a SINR equal to or greater than a predetermined value and having a small buffer amount for the user terminal that has reported the SINR for the detection / measurement signal, and shifts to the on state. To do.
  • the scheduler 304 performs allocation (scheduling) of radio resources for DL signals to be transmitted to the user terminal 20. For example, the scheduler 304 provides DS information regarding the detection / measurement signal transmitted from the small base station in the DTX state to the user terminal (signal configuration of the detection / measurement signal, transmission timing (transmission period, transmission period), etc. ) To the DL signal generation unit 305.
  • the DL signal generation unit 305 generates a DL signal based on an instruction from the scheduler 304. For example, the DL signal generation unit 305 generates a control signal, a data signal, a reference signal, and the like. Also, the DL signal generation unit 305 generates information (DS information) related to the detection / measurement signal transmitted from the small base station in the DTX state as an upper layer signal or a notification signal. The signal generated by the DL signal generation unit 305 is transmitted to the user terminal 20 via the transmission / reception unit 103.
  • the UE reception state acquisition unit 301 of the macro base station 11 uses the received power (RSRQ) calculated using the received power and the total received power measured in the subframe in which the cell-specific reference signal (CRS) is transmitted. It can be acquired from the user terminal. In this case, the reception quality calculated using the detection / measurement signal and the reception quality calculated using the cell-specific reference signal are compared, and the cell (macro cell or small cell) to which the user terminal is connected is selected. A selection unit that performs this may be further provided in the macro base station 11.
  • RSS received power
  • CRS cell-specific reference signal
  • FIG. 9 is an overall configuration diagram of the user terminal 20 according to the present embodiment.
  • the user terminal 20 includes a plurality of transmission / reception antennas 201 for MIMO transmission, an amplifier unit 202, a transmission / reception unit (reception unit) 203, a baseband signal processing unit 204, and an application unit 205.
  • radio frequency signals received by a plurality of transmission / reception antennas 201 are each amplified by an amplifier unit 202, converted in frequency by a transmission / reception unit 203, and converted into a baseband signal.
  • the baseband signal is subjected to FFT processing, error correction decoding, retransmission control reception processing, and the like by the baseband signal processing unit 204.
  • downlink user data is transferred to the application unit 205.
  • the application unit 205 performs processing related to layers higher than the physical layer and the MAC layer. Also, broadcast information in the downlink data is also transferred to the application unit 205.
  • uplink user data is input from the application unit 205 to the baseband signal processing unit 204.
  • transmission processing for retransmission control H-ARQ (Hybrid ARQ)
  • channel coding precoding
  • DFT processing IFFT processing
  • the like are performed and transferred to each transmission / reception unit 203.
  • the transmission / reception unit 203 converts the baseband signal output from the baseband signal processing unit 204 into a radio frequency band.
  • the amplifier unit 202 amplifies the frequency-converted radio frequency signal and transmits the amplified signal using the transmitting / receiving antenna 201.
  • FIG. 10 is a main functional configuration diagram of the baseband signal processing unit 204 included in the user terminal 20.
  • the baseband signal processing unit 204 included in the user terminal 20 includes at least a detection / measurement unit 401, a DS information acquisition unit 402, a reception quality calculation unit 403, and a UL signal generation unit 404.
  • the detection / measurement unit 401 detects / measures a DL signal transmitted from the macro base station 11 and / or the small base station 12. For example, the detection / measurement unit 401 receives received power (RSRP) of a detection / measurement signal transmitted from a small base station in a DTX state in a predetermined subframe and a DL signal in a subframe in which the detection / measurement signal is not transmitted. Measure the total received power (RSSI). Note that the detection / measurement unit 401 can efficiently perform the detection operation by detecting the detection / measurement signal using the information supplied from the DS information acquisition unit 402.
  • RSRP received power
  • RSSI total received power
  • the detection / measurement unit 401 may measure the received SINR of the detection / measurement signal in the subframe in which the detection / measurement signal is transmitted (second aspect).
  • the DS information acquisition unit 402 obtains DS information (signal configuration of the detection / measurement signal, transmission timing (transmission period, transmission period), etc.) related to the detection / measurement signal transmitted from the small base station in the DTX state. 11 from.
  • the DS information acquisition unit 402 specifies the transmission timing of the detection / measurement signal based on the DS information received from the macro base station 11, and outputs it to the detection / measurement unit 401.
  • Reception quality calculation section 403 uses the received power (RSRP) of the detection / measurement signal measured by detection / measurement section 401 and the total received power (RSSI) of the subframe in which the detection / measurement signal is not transmitted. (RSRQ) is calculated. Specifically, the reception quality calculation unit 403 calculates the reception quality (RSRQ) based on the ratio between the reception power (RSRP) and the value obtained by adding the reception power (RSRP) to the total reception power (RSSI). At this time, the RSRQ calculated by the reception quality calculation unit 403 is expressed by the above equation (2).
  • the processing in the reception quality calculation unit 403 can be omitted.
  • the UL signal generation unit 404 generates information (measurement report) on the reception quality (RSRQ) calculated by the reception quality calculation unit 403 and the reception power (RSRP) measured by the detection / measurement unit 401 as an uplink signal. Also, the UL signal generation unit 404 transmits the total received power (RSSI) itself (modified example 1 of the first aspect) or transmits the reception SINR of the detection / measurement signal (the second second). Aspect), information on RSSI and SINR is generated as an uplink signal. The UL signal generation unit 404 also generates an uplink control signal such as a delivery confirmation signal and an uplink data signal.
  • RSSI total received power
  • SINR the reception SINR of the detection / measurement signal

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  • Signal Processing (AREA)
  • Quality & Reliability (AREA)
  • Computer Security & Cryptography (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Mobile Radio Communication Systems (AREA)
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