WO2015170569A1 - ユーザ端末、基地局および無線通信方法 - Google Patents
ユーザ端末、基地局および無線通信方法 Download PDFInfo
- Publication number
- WO2015170569A1 WO2015170569A1 PCT/JP2015/061894 JP2015061894W WO2015170569A1 WO 2015170569 A1 WO2015170569 A1 WO 2015170569A1 JP 2015061894 W JP2015061894 W JP 2015061894W WO 2015170569 A1 WO2015170569 A1 WO 2015170569A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- reference signal
- measurement
- small cell
- user terminal
- cell
- Prior art date
Links
- 238000004891 communication Methods 0.000 title claims description 18
- 238000000034 method Methods 0.000 title claims description 9
- 238000005259 measurement Methods 0.000 claims abstract description 129
- 238000001514 detection method Methods 0.000 claims abstract description 87
- 230000005540 biological transmission Effects 0.000 claims description 62
- 208000000649 small cell carcinoma Diseases 0.000 abstract 4
- 238000012545 processing Methods 0.000 description 35
- 230000007274 generation of a signal involved in cell-cell signaling Effects 0.000 description 12
- 238000010586 diagram Methods 0.000 description 8
- 230000011664 signaling Effects 0.000 description 5
- 238000007726 management method Methods 0.000 description 4
- 238000012937 correction Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000010295 mobile communication Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000013307 optical fiber Substances 0.000 description 2
- 108010076504 Protein Sorting Signals Proteins 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 238000004220 aggregation Methods 0.000 description 1
- 239000000969 carrier Substances 0.000 description 1
- 238000012790 confirmation Methods 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W48/00—Access restriction; Network selection; Access point selection
- H04W48/08—Access restriction or access information delivery, e.g. discovery data delivery
- H04W48/12—Access restriction or access information delivery, e.g. discovery data delivery using downlink control channel
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J11/00—Orthogonal multiplex systems, e.g. using WALSH codes
- H04J11/0069—Cell search, i.e. determining cell identity [cell-ID]
- H04J11/0079—Acquisition of downlink reference signals, e.g. detection of cell-ID
-
- 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
- H04W36/00—Hand-off or reselection arrangements
- H04W36/0005—Control or signalling for completing the hand-off
- H04W36/0055—Transmission or use of information for re-establishing the radio link
-
- 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
- H04W36/0055—Transmission or use of information for re-establishing the radio link
- H04W36/0061—Transmission or use of information for re-establishing the radio link of neighbour cell information
-
- 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
- H04W36/0083—Determination of parameters used for hand-off, e.g. generation or modification of neighbour cell lists
- H04W36/0085—Hand-off measurements
- H04W36/0088—Scheduling hand-off measurements
-
- 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
- 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
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
- H04W88/02—Terminal devices
Definitions
- the present invention relates to a user terminal, a base station, 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 for example, 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 (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.
- E-UTRA Evolved Universal Terrestrial Radio Access
- E-UTRAN Evolved Universal Terrestrial Radio Access Network
- Stage 2 3GPP TR 36.814 “E-UTRA further advancements for E-UTRA physical layer aspects”
- small cell detection Small cell discovery
- the user terminal is connected to a network, for example, a macro cell, so that the network may provide assist information for small cell detection as necessary.
- the assist information that can be provided varies depending on the network configuration and implementation, small cell discovery operation using DRS (Discovery Reference Signal) including PSS / SSS / CRS / CSI-RS, etc. It is preferable to prescribe each operation of the user terminal corresponding to the presence / absence of assist information from the network.
- DRS Discovery Reference Signal
- the present invention has been made in view of such points, and an object thereof is to provide a user terminal, a base station, and a radio communication method capable of appropriately performing a small cell detection operation based on the presence / absence of assist information from a network.
- a user terminal is a user terminal that communicates with a base station that forms a small cell and a base station that forms a macro cell including the small cell in a coverage range, and includes timing information and assist information transmitted from the macro cell.
- a reception unit that receives the included small cell detection instruction, a detection unit that detects a synchronization signal included in a small cell detection reference signal transmitted from the small cell according to the timing information, the detected synchronization signal, and the assist information
- a measurement unit that measures a reference signal for measurement included in the small cell detection reference signal according to the timing information, wherein the timing information includes values of the offset, period, and period of the small cell detection reference signal, and the assist
- the information includes the small cell or the physical cell I of the transmission point. Characterized in that it includes scrambling ID used for the reference signal for the measurement, the value of the time-frequency resource configuration index and sub-frame offset.
- the small cell detection operation can be appropriately performed based on the presence / absence of assist information from the network.
- DRS small cell detection
- DRS small cell detection
- PCI physical cell ID
- scramble ID scramble ID
- resource structure which were set to the small cell.
- PCI physical cell ID
- FIG. It is a figure explaining the structure of DRS in FIG.
- FIG. It is a figure explaining the example of a measurement by a user terminal.
- CRS and PRS It is a figure which shows an example of schematic structure of the radio
- DRS-based measurement can be configured for a user terminal in an RRC (Radio Resource Control) connection state (RRC CONNECTED).
- RRC Radio Resource Control
- one measurement timing configuration is set for each carrier.
- This measurement timing configuration includes at least the DRS offset and period.
- the DRS includes at least PSS / SSS (Primary Synchronization Signal / Secondary Synchronization Signal), and additionally includes either one or both of CRS (Cell-specific Reference Signal) and CSI-RS (Channel State Information-Reference Signal).
- a user terminal detects a small cell using assistance from a network (for example, a base station). Specifically, the small cell transmits DRS in a long cycle, the network notifies the user terminal of timing information for measuring the DRS, and the user terminal performs DRS measurement using the notified timing and the like.
- the network also controls the connection of the user terminal to the small cell based on the reception status (RSRP (Reference Signal Received Power) / RSRQ (Reference Signal Received Quality)) reported from the user terminal that detected the DRS. It is assumed that
- the user terminal in the RRC connected state is set with the measurement timing configuration from the connected cell, it can efficiently perform DRS detection and measurement only at the timing when the DRS is transmitted. Further, even if the timings of the macro cell and the small cell are shifted due to a propagation delay difference or the like, the DRS timing can be captured by PSS / SSS.
- FIG. 1A includes a small base station eNB2 that forms a small cell, a macro base station eNB1 that forms a macro cell that includes the small cell in a coverage range, and a user terminal UE that can communicate with the macro base station eNB1 and the small base station eNB2. It shows the system that is configured.
- the macro base station eNB1 and the small base station eNB2 are synchronized or know the timing difference from each other.
- indicates the presence or absence of the small cell detection using DRS with respect to the user terminal UE currently connected to the said base station eNB1.
- the macro base station eNB1 notifies the user terminal UE of timing information (measurement timing configuration). Furthermore, the macro base station eNB1 may notify the assist information to the user terminal UE.
- the macro base station eNB1 instructs the user terminal to detect the small cell using higher layer signaling (for example, RRC signaling). Specifically, the macro base station eNB1 notifies the user terminal of information regarding the presence / absence of small cell detection using DRS in an information element (MeasObjectEUTRA (hereinafter also referred to as “MeasObject”)) that defines a measurement target. To do.
- the macro base station eNB1 notifies the user terminal UE including a small cell detection instruction (DiscoveryConfig) during MeasObject, while defining the reference signal configuration for small cell detection as timing information and assist information, for example. It is included in the element (DiscoveryRS-Config) and notified to the user terminal UE.
- DiscoveryRS-Config small cell detection instruction
- the user terminal instructed to detect small cells from the network executes small cell detection using DRS.
- a period until a small cell first transmits a DRS is defined as a DRS offset.
- DRS is transmitted in a DRS cycle.
- the DRS period (duration) is a time length during which a synchronization signal and a measurement reference signal included in the DRS are transmitted within one DRS cycle.
- Information of these DRS offset, DRS cycle, and DRS period is included in the timing information.
- Fig. 2 Two options shown in Fig. 2 are under consideration as DRS designs.
- One of the purposes of introducing small cell detection is to enable measurement of off-state cells when the small cells are turned on and off.
- DRS option # 1 shown in FIG. 2A PSS / SSS / CRS is transmitted in a short cycle and a short burst.
- the DRS is a subset of the synchronization signal (SS) and CRS that are always transmitted.
- SS synchronization signal
- FIG. 2A in the ON state, PSS / SSS is transmitted at a cycle of 5 [ms], CRS is transmitted at a cycle of 1 [ms], and a data signal is transmitted.
- PSS / SSS and CRS are transmitted for 1 [ms] in a cycle of 40 [ms].
- PSS / SSS / CSI-RS is transmitted in a long cycle and a short burst.
- PSS / SSS is a subset of the normal synchronization signal (SS) in the ON state as in option # 1.
- the CSI-RS in the DRS is transmitted in an on / off state for discovery separately from the CSI-RS for normal CSI measurement.
- PSS / SSS is transmitted at a cycle of 5 [ms]
- CRS is transmitted at a cycle of 1 [ms]
- a data signal is transmitted.
- the CSI-RS for discovery is transmitted for 1 [ms] with a period of 40 [ms], for example, regardless of the on / off state.
- PSS / SSS used from LTE is designed so that a user terminal can autonomously search 504 physical cell IDs (PCIDs). Although there is a mechanism in which the network notifies the user terminal of the physical cell ID list of the neighboring cell, the user terminal can recognize the physical cell ID of the neighboring cell from the received PSS / SSS even if this list is not notified.
- PCIDs physical cell IDs
- the CRS transmitted with the DRS option # 1 usually has its transmission sequence and transmission resource position uniquely determined by the physical cell ID. Therefore, when a physical cell ID is detected by PSS / SSS, it is uniquely determined by which resource or sequence the RSRP / RSRQ of the corresponding cell should be measured. In the case of DRS option # 1, the user terminal can detect and measure neighboring small cells without any assist information other than the measurement timing configuration.
- the PSS / Scramble ID (PSS / Scrambling ID) for determining a transmission sequence is determined. It is recognized that the same physical cell ID as that used in SSS is used. Further, when a value is designated from the network, the user terminal uses the value as a scramble ID.
- the transmission resource location (CSI-RS configuration index, CSI-RS subframe config, CSI-RS subframe offset) is usually irrelevant to the physical cell ID and needs to be notified from the network.
- DRS option # 2 As described above, in the case of DRS option # 2, normally, unless a mechanism for separately reporting a cell-specific resource configuration index is introduced, the user terminal cannot know which resource is used for detection and measurement. This is because the number of combinations of 504 physical cell IDs and a maximum of 20 CSI-RS configurations is about 10,000. Therefore, in the case of DRS option # 2, it is assumed that the user terminal is notified as to which cell is using which CSI-RS configuration.
- CSI-RS for CSI measurement
- the network must notify the user terminal of a set of CSI-RS configurations for all neighboring cells that are detection candidates.
- assist information which is a set of a scramble ID and a CSI-RS configuration, for all peripheral small cells.
- assist information which is a set of a scramble ID and a CSI-RS configuration
- DRS Option # 1 when all measurement reference signal sequences, resource locations, etc. are determined based on the physical cell ID as in DRS Option # 1, the same measurement reference signal is used between transmission points when the same cell ID is used. Is transmitted, and there is a problem that each transmission point cannot be identified. If CSI-RS is used as in DRS Option # 2, scramble IDs and resource configurations different from physical cell IDs can be set individually for each transmission point. Can measure.
- FIG. 3 is a diagram showing a physical cell ID (PCI), a scramble ID, and a resource configuration set for a small cell. As shown in FIG. 3, when the same cell ID is used, the physical cell ID (PCI), the scramble ID of the reference signal for measurement in the DRS option # 2, and the resource configuration can be separated.
- PCI physical cell ID
- SCI the physical cell ID
- SCI the scramble ID of the reference signal for measurement in the DRS option # 2
- the resource configuration can be separated.
- the present inventors enable transmission point identification when using the same cell ID and enable small cell detection and measurement based on DRS even when assist information other than the measurement timing configuration cannot be obtained.
- the user terminal operation in small cell detection is defined for each of cases where assist information other than the measurement timing configuration is obtained and cases where the assist information is not obtained.
- the base station eNB uses the scramble ID of the reference signal for measurement, the corresponding time frequency resource configuration, and the corresponding physical cell as assist information.
- the user terminal is notified of the ID, and the user terminal detects and measures the DRS according to the set assist information.
- the base station eNB does not assist the connected user terminal other than timing information.
- a prior rule based on a physical cell ID obtained from the PSS / SSS is defined so that the user terminal can autonomously determine the sequence pattern of the measurement reference signal and the measurement resource position.
- the user terminal can autonomously perform DRS detection and measurement.
- the user terminal can be used to perform more efficient DRS detection and measurement. Furthermore, it is possible to deal with transmission point recognition when the same cell ID is used.
- ⁇ Operation 1> Consider a case where a user terminal is notified of a common DRS offset, cycle, and period as timing information, and that all information regarding DRS transmission of each small cell or transmission point can be accurately managed as a network.
- the user terminal in addition to the timing information, the user terminal is notified of the physical cell ID of each small cell or transmission point, the time-frequency resource configuration index, and the scramble ID used for the measurement reference signal in addition to the timing information.
- a plurality of time frequency resource configuration indexes may be set for each small cell or transmission point.
- the subframe offset is also notified as assist information.
- FIG. 4 is a diagram showing the DRS in FIG.
- a DRS offset (DRS offset), a DRS period (DRS period), and a DRS period (DRS duration) are notified as timing information.
- the DRS period is 3 subframes
- PSS / SSS is transmitted as a synchronization signal in the first subframe
- CSI-RS is transmitted as a measurement reference signal in the remaining subframes.
- a physical cell ID (PCID), a scramble ID (Scrambling ID), a CSI-RS configuration index (CSI-RS config), and a subframe offset (Subframe offset) are notified.
- the user terminal When the above information is notified, the user terminal performs DRS measurement using these.
- the user terminal When the above information is notified, the user terminal performs DRS measurement using these.
- the user terminal When the user terminal detects PSS / SSS according to the timing information, the user terminal may or may not be limited to the physical cell ID included in the notified neighboring cell list.
- the user terminal may measure the measurement reference signal of the small cell or transmission point corresponding to the physical cell ID obtained by the PSS / SSS detection according to the notified information, or all the notified reference for measurement. The signal may be measured.
- the user terminal can use PSS / SSS only for timing synchronization, or can use PSS / SSS for timing synchronization and physical cell ID recognition.
- the user terminal may perform the measurement operation assuming that the measurement reference signal is arranged at a known subframe position within the DRS period.
- a known subframe position that is assumed to be provided with the measurement reference signal may be defined in the specification, and may be, for example, a subframe that does not include PSS / SSS (see FIG. 5A).
- the user terminal may perform the measurement operation assuming that measurement reference signals are arranged at all subframe positions within the DRS period.
- the DRS period is 4 subframes, and the user terminal assumes that the measurement reference signal (CSI-RS in FIG. 5A) is arranged in the subframe not including PSS / SSS. Measuring operation.
- a known subframe position based on a subframe including PSS / SSS may be defined in the specification, and can be, for example, the same subframe as the subframe including PSS / SSS or a subframe immediately thereafter (see FIG. 5B).
- the user terminal is arranged with a measurement reference signal (CSI-RS in FIG. 5B) in the same subframe including the PSS / SSS. Measurement operation (example on the left).
- the user terminal performs the measurement operation assuming that the measurement reference signal (CSI-RS in FIG. 5B) is arranged in the subframe immediately after the subframe including PSS / SSS (example on the right side). .
- the user terminal assumes that this physical cell ID is a scramble ID used for the measurement reference signal, and sets the detected physical cell ID (scramble ID). Measurements may be performed on the corresponding time frequency resource configuration.
- the user terminal may measure all sets of the scramble ID and the time-frequency resource configuration used for the measurement reference signal notified as the assist information at the timing detected by the PSS / SSS. In this case, the user terminal does not assume the physical cell ID as a scramble ID used for the measurement reference signal.
- the user terminal transmits the notified scramble ID and time frequency resource configuration index (FIG. 6A).
- time frequency resource configuration index In CSI-RS configuration index
- the user terminal assumes that the physical cell ID obtained by the PSS / SSS detection is a scramble ID used for the measurement reference signal, and measures only the time-frequency resource configuration index corresponding to the detected physical cell ID. You may go.
- the user terminal assumes the physical cell ID as a scramble ID used for the measurement reference signal, and measures the corresponding time-frequency resource configuration. Also good.
- the user terminal may measure all the time frequency resource configurations assisted at the timing detected by the PSS / SSS, assuming that the scramble ID notified as the assist information is a physical cell ID.
- the user terminal may assume this physical cell ID as a scramble ID and measure combinations of all notified time-frequency resource configurations.
- the user terminal may measure a time frequency resource configuration including a value obtained from a known rule for the detected physical cell ID.
- the known rule may be defined in the specification, for example, mod (PCID, 5).
- the number of time-frequency resource configurations to be set for each small cell or transmission point notifies the number of simultaneous settings in the measurement configuration, which is assist information common to all cells, and 1 as the assist information for each small cell or transmission point. Only one index value may be notified (see FIG. 7). “Number of CSI reference signals configured” in TS36.211 Table6.10.5.2-1 corresponds to the number of simultaneous settings in this case.
- the user terminal may assume the maximum number of time frequency resource configurations included in the assist information of each small cell or transmission point as the simultaneous setting number.
- ⁇ Operation 7> Consider a case where the user terminal is not notified of information such as a time-frequency resource configuration as assist information, but is notified of only timing information and a cell list (physical cell ID).
- the user terminal may or may not limit the target when performing PSS / SSS detection based on the cell list.
- the user terminal may measure all combinations of time-frequency resource configuration candidates on the assumption that the physical cell ID obtained by PSS / SSS detection is a scramble ID used for the measurement reference signal. Or a user terminal may measure the combination with all the time frequency resource structure indexes supposing the notified physical cell ID as the scramble ID used for the reference signal for measurement.
- the user terminal may perform measurement by assuming a physical cell ID and a value obtained from a known rule as a time-frequency resource configuration index corresponding to the physical cell ID.
- the known rule may be defined in the specification, for example, mod (PCID, X).
- the CP length may be derived by PSS / SSS detection, or may be notified in advance from the network.
- the user terminal may measure all combinations of time frequency resource configuration candidates assuming that the physical cell ID obtained by the PSS / SSS detection is a scramble ID.
- the user terminal may perform measurement by assuming the obtained physical cell ID and a value obtained from a known rule as a time-frequency resource configuration index corresponding to the physical cell ID.
- the known rule may be defined in the specification, for example, mod (PCID, 20).
- the user terminal uses PSS / SSS only for timing synchronization, and can measure all candidates notified as assist information for the measurement reference signal.
- the user terminal can use PSS / SSS for timing synchronization and physical cell ID recognition, and can measure a candidate corresponding to the detected physical cell ID for the measurement reference signal.
- the user terminal searches for PSS / SSS according to the timing information.
- the detection candidates may or may not be limited.
- a combination of zero or more synchronization timings and physical cell IDs is found.
- the user terminal measures RSRP / RSRQ using the measurement reference signal according to the detected synchronization timing.
- the user terminal may or may not limit the measurement reference signal measurement candidates based on the synchronization timing and the physical cell ID detected as a set.
- assist information of the time-frequency resource configuration only the information corresponding to the detected physical cell ID may be set as the measurement target, or all of the assists may be set as the measurement targets. If there is no assist information for the time-frequency resource configuration, the time-frequency resource configuration to be measured may be determined according to a known rule based on the detected physical cell ID, or all possible candidates may be measured. Good.
- PSS / SSS / CSI-RS has been described as an example of transmitting a long period and a short burst, but instead of CSI-RS, CRS (see FIG. 8A) or PRS is used.
- CRS see FIG. 8A
- PRS Positioning Reference Signal
- the small cell or transmission point can be measured based on the physical cell ID obtained from the PSS / SSS without assistance, but transmission point recognition or the like when the same cell ID is used is impossible.
- each cell may transmit only in some subframes and may not transmit in other subframes.
- the conventional user terminal Legacy UE
- the above extension is performed on a frequency carrier in which the conventional user terminal does not exist. is doing.
- a user terminal operation similar to the above operations 2, 3, 8, etc. can be considered depending on the presence / absence of notification of the scramble ID and the presence / absence of notification of the DRS period or subframe offset.
- FIG. 9 is a schematic configuration diagram showing an example of a radio communication system according to the present embodiment.
- the radio communication system 1 is in a cell formed by a plurality of radio base stations 10 (11 and 12) and each radio base station 10, and is configured to be able to communicate with each radio base station 10.
- Each of the radio base stations 10 is connected to the higher station apparatus 30 and connected to the core network 40 via the higher station apparatus 30.
- the radio base station 11 is composed of, for example, a macro base station having a relatively wide coverage, and forms a macro cell C1.
- the radio base station 12 is configured by a small base station having local coverage, and forms a small cell C2.
- the number of radio base stations 11 and 12 is not limited to the number shown in FIG.
- the same frequency band may be used, or different frequency bands may be used.
- the radio base stations 11 and 12 are connected to each other via an inter-base station interface (for example, optical fiber, X2 interface).
- the user terminal 20 is a terminal that supports various communication methods such as LTE and LTE-A, and may include not only a mobile communication terminal but also a fixed communication terminal.
- the user terminal 20 can execute communication with other user terminals 20 via the radio base station 10.
- the upper station apparatus 30 includes, for example, an access gateway apparatus, 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
- 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). ), A broadcast channel (PBCH) or the like is used.
- PDSCH Physical Downlink Shared Channel
- PDCCH Physical Downlink Control Channel
- EPDCCH Enhanced Physical Downlink Control Channel
- PBCH broadcast channel
- DCI Downlink control information
- an uplink shared channel (PUSCH: Physical Uplink Shared Channel) shared by each user terminal 20, an uplink control channel (PUCCH: Physical Uplink Control Channel), or the like is used as an uplink channel.
- PUSCH Physical Uplink Shared Channel
- PUCCH Physical Uplink Control Channel
- User data and higher layer control information are transmitted by PUSCH.
- FIG. 10 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. Part 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 transmission / reception unit 103 converts the downlink signal output from the baseband signal processing unit 104 by precoding 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, state management of the radio base station 10, and radio resource management.
- the interface unit 106 transmits / receives a signal (backhaul signaling) to / from an adjacent radio base station via an inter-base station interface (for example, optical fiber, X2 interface). Alternatively, the interface unit 106 transmits and receives signals to and from the higher station apparatus 30 via a predetermined interface.
- a signal backhaul signaling
- inter-base station interface for example, optical fiber, X2 interface
- FIG. 11 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 at least a scheduler (control unit) 301, a DRS parameter determination unit 302, a small cell detection instruction unit 303, a DL signal generation unit 304, and a measurement report acquisition unit 305.
- the scheduler 301 allocates (schedules) a DL signal radio resource transmitted to the user terminal 20 and a UL signal radio resource transmitted from the user terminal 20. For example, the scheduler 301 instructs the DL signal generation unit 304 to generate assist information when performing small cell detection to the user terminal 20.
- the scheduler 301 notifies the user terminal 20 of the MeasObject including the small cell detection instruction (DiscoveryConfig), while detecting the timing information and the assist information for detection. It can be controlled to be included in the information element (DiscoveryRS-Config) that defines the signal configuration.
- DiscoveryConfig small cell detection instruction
- the small cell detection instruction unit 303 controls a small cell detection instruction using DRS for the user terminal 20.
- the small cell detection instructing unit 303 instructs the user terminal (Connected UE) connected to the macro base station 11 whether or not the small cell is detected at a predetermined frequency.
- the DRS parameter determination unit 302 determines information regarding DRS parameters when the user terminal 20 is instructed to detect a small cell using DRS. Information relating to the DRS parameters includes assist information. Information determined by the DRS parameter determination unit 302 is output to the scheduler 301 and the DL signal generation unit 304.
- the DL signal generation unit 304 generates a DL signal based on instructions from the scheduler 301 and the DRS parameter determination unit 302.
- the signal generated by the DL signal generation unit 304 is transmitted to the user terminal 20 via the transmission / reception unit 103.
- the measurement report acquisition unit 305 acquires a measurement report notified from the user terminal.
- the measurement report acquisition unit 305 receives a result obtained by small cell detection using DRS in the user terminal as a measurement report.
- the measurement report acquisition part 305 controls the connection to the small cell of the user terminal 20 based on the said measurement report.
- FIG. 12 is a functional configuration diagram of the small base station 12 according to the present embodiment.
- the following functional configuration is configured by the baseband signal processing unit 104 included in the small base station 12 and the like.
- the small base station 12 includes at least a UL signal detection unit 311, a scheduler 312, and a DL signal generation unit 313.
- the UL signal detection unit 311 detects a UL signal transmitted from the user terminal 20. It is also possible for the UL signal detection unit 311 to receive a measurement report notified from the user terminal 20.
- the scheduler 312 performs allocation (scheduling) of radio resources for DL signals to be transmitted to the user terminal 20.
- the scheduler 312 controls transmission of DRS.
- the DL signal generation unit 313 generates a DL signal based on an instruction from the scheduler 312. For example, the DL signal generation unit 313 generates a synchronization signal (PSS / SSS), a reference signal (CRS), a small cell detection reference signal (DRS), a control signal, a data signal, and the like.
- PSS / SSS synchronization signal
- CRS reference signal
- DRS small cell detection reference signal
- the signal generated by the DL signal generation unit 313 is transmitted to the user terminal 20 via the transmission / reception unit 103.
- FIG. 13 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, an application unit 205, It is equipped with.
- 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.
- 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.
- the baseband signal processing unit 204 retransmission control (HARQ: Hybrid ARQ) transmission processing, channel coding, precoding, DFT processing, IFFT processing, and 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. Thereafter, the amplifier unit 202 amplifies the frequency-converted radio frequency signal and transmits the amplified signal using the transmitting / receiving antenna 201.
- FIG. 14 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 cell detection / measurement unit 401, a measurement report transmission control unit 402, and a UL signal generation unit 403.
- the cell detection / measurement unit 401 performs small cell detection using DRS transmitted from the small base station 12. In addition, the cell detection / measurement unit 401 receives information on the small cell detection instruction from the macro base station 11 by RRC signaling. In addition, when performing small cell detection, the cell detection / measurement unit 401 detects DRS based on information (assist information) related to DRS parameters notified from the macro base station 11.
- the measurement report transmission control unit 402 controls transmission as a measurement report for the result of small cell detection performed by the cell detection / measurement unit 401.
- the measurement report transmission control unit 402 acquires a cell identifier / RSRP / RSRQ corresponding to a predetermined cell obtained by small cell detection.
- the measurement report transmission control unit 402 controls to report the measurement result as a measurement report to the network (base station).
- the measurement report transmission control unit 402 controls the transmission of the measurement report for the result obtained by the small cell detection.
- the UL signal generation unit 403 generates a measurement report and the like based on an instruction from the measurement report transmission control unit 402.
- the UL signal generation unit 403 also generates an uplink control signal such as a delivery confirmation signal and an uplink data signal.
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Computer Security & Cryptography (AREA)
- Databases & Information Systems (AREA)
- Mobile Radio Communication Systems (AREA)
Abstract
Description
スモールセル検出においては、RRC(Radio Resource Control)接続状態(RRC CONNECTED)のユーザ端末に対し、DRS-based measurementを設定(configure)することができる。また、各キャリアには、1つの測定タイミング構成(measurement timing configuration)が設定される。この測定タイミング構成には、少なくともDRSのオフセットと周期が含まれる。DRSは少なくともPSS/SSS(Primary Synchronization Signal/Secondary Synchronization Signal)を含み、それに加えてCRS(Cell-specific Reference Signal)またはCSI-RS(Channel State Information-Reference Signal)のいずれかあるいはその両方を含む。
ユーザ端末に、タイミング情報として共通のDRSオフセット、周期および期間が通知され、さらにネットワークとして各スモールセルまたは送信ポイントのDRS送信に関するすべての情報を正確に管理できている場合について検討する。
ユーザ端末に、DRS期間が含まれるタイミング情報が通知されるが、アシスト情報に各スモールセルまたは送信ポイントのサブフレームオフセットの値が含まれていない場合について検討する。
ユーザ端末に通知されるタイミング情報にDRS期間が含まれない場合について検討する。
ユーザ端末に通知されるアシスト情報に各スモールセルまたは送信ポイントの物理セルIDが含まれない場合について検討する。
ユーザ端末に通知されるアシスト情報に各スモールセルまたは送信ポイントの測定用参照信号に用いられるスクランブルIDが含まれない場合について検討する。
ユーザ端末に通知されるアシスト情報に各スモールセルまたは送信ポイントの物理セルIDおよび測定用参照信号に用いられるスクランブルIDの両方が含まれない場合について検討する。
ユーザ端末に、アシスト情報として時間周波数リソース構成などの情報が通知されず、タイミング情報およびセルリスト(物理セルID)のみが通知される場合について検討する。
ユーザ端末に、タイミング情報以外のアシスト情報が何も通知されない場合について検討する。
ユーザ端末は、PSS/SSSをタイミング同期のみに使用し、測定用参照信号についてはアシスト情報として通知されたすべての候補を測定することができる。あるいは、ユーザ端末は、PSS/SSSをタイミング同期と物理セルID認識に使用し、測定用参照信号については検出された物理セルIDに対応する候補を測定することができる。
以下、本実施の形態に係る無線通信システムの構成について説明する。この無線通信システムでは、上述のスモールセル検出を行う無線通信方法が適用される。
Claims (10)
- スモールセルを形成する基地局および前記スモールセルをカバレッジ範囲に含むマクロセルを形成する基地局と通信するユーザ端末であって、
前記マクロセルから送信されるタイミング情報およびアシスト情報を含んだスモールセル検出指示を受信する受信部と、
前記タイミング情報に従って前記スモールセルから送信されるスモールセル検出参照信号に含まれる同期信号を検出する検出部と、
前記検出した同期信号と前記アシスト情報に従って前記スモールセル検出参照信号に含まれる測定用参照信号を測定する測定部と、を備え、
前記タイミング情報には、前記スモールセル検出参照信号のオフセット、周期および期間の値が含まれ、
前記アシスト情報には、前記スモールセルまたは送信ポイントの物理セルID、前記測定用参照信号に用いられるスクランブルID、時間周波数リソース構成インデックスおよびサブフレームオフセットの値が含まれることを特徴とするユーザ端末。 - 前記アシスト情報には、前記サブフレームオフセットの値が含まれず、
前記測定部は、前記スモールセル検出参照信号期間内の前記同期信号が含まれないサブフレームに前記測定用参照信号があると想定して前記測定用参照信号を測定することを特徴とする請求項1に記載のユーザ端末。 - 前記タイミング情報には、前記スモールセル検出参照信号期間の値が含まれず、
前記測定部は、前記同期信号が検出された際に、前記同期信号を含むサブフレームと同一サブフレームに前記測定用参照信号があると想定して前記測定用参照信号を測定することを特徴とする請求項1に記載のユーザ端末。 - 前記アシスト情報には、前記物理セルIDまたは前記測定用参照信号に用いられるスクランブルIDの値が含まれず、
前記測定部は、前記同期信号検出により得られた物理セルIDを前記測定用参照信号に用いられるスクランブルIDと想定し、前記検出された物理セルIDに対応する前記時間周波数リソース構成インデックスについて前記測定用参照信号を測定することを特徴とする請求項1に記載のユーザ端末。 - 前記アシスト情報には、前記物理セルIDおよび前記測定用参照信号に用いられるスクランブルIDの値が含まれず、
前記測定部は、前記同期信号検出により得られた物理セルIDを前記測定用参照信号に用いられるスクランブルIDと想定し、前記アシスト情報として通知されたすべての前記時間周波数リソース構成インデックスとの組み合わせについて前記測定用参照信号を測定することを特徴とする請求項1に記載のユーザ端末。 - 前記アシスト情報には、前記物理セルIDおよび前記測定用参照信号に用いられるスクランブルIDの値が含まれず、
前記測定部は、前記同期信号検出により得られた物理セルIDに対して特定のルールから得られる値を含む時間周波数リソース構成インデックスについて前記測定用参照信号を測定することを特徴とする請求項1に記載のユーザ端末。 - 前記アシスト情報には、前記測定用参照信号に用いられるスクランブルID、時間周波数リソース構成インデックスおよびサブフレームオフセットの値が含まれず、
前記測定部は、前記同期信号検出により得られた物理セルIDを前記測定用参照信号に用いられるスクランブルIDと想定し、すべての時間周波数リソース構成インデックス候補との組み合わせについて前記測定用参照信号を測定するか、または、前記同期信号検出により得られた物理セルIDに対して特定のルールから得られる値を含む時間周波数リソース構成インデックスについて前記測定用参照信号を測定することを特徴とする請求項1に記載のユーザ端末。 - 前記アシスト情報が通知されず、
前記測定部は、前記同期信号検出により得られた物理セルIDを前記測定用参照信号に用いられるスクランブルIDと想定し、すべての時間周波数リソース構成インデックス候補との組み合わせについて前記測定用参照信号を測定するか、または、前記同期信号検出により得られた物理セルIDに対して特定のルールから得られる値を含む時間周波数リソース構成インデックスについて前記測定用参照信号を測定することを特徴とする請求項1に記載のユーザ端末。 - スモールセルをカバレッジ範囲に含むマクロセルを形成するとともに、前記スモールセルに接続可能なユーザ端末と通信を行う基地局であって、
前記スモールセルから送信されるスモールセル検出参照信号を用いた検出処理をユーザ端末に指示する指示部と、
前記ユーザ端末にタイミング情報およびアシスト情報を含んだスモールセル検出指示を送信する送信部と、を備え、
前記送信部は、前記タイミング情報には、スモールセル検出参照信号のオフセット、周期および期間の値を含め、前記アシスト情報には、前記スモールセルまたは送信ポイントの物理セルID、前記測定用参照信号に用いられるスクランブルID、時間周波数リソース構成インデックスおよびサブフレームオフセットの値の少なくとも1つを含めまたはいずれも含まないことを特徴とする基地局。 - スモールセルを形成する基地局および前記スモールセルをカバレッジ範囲に含むマクロセルを形成する基地局と通信するユーザ端末の無線通信方法であって、
前記マクロセルから送信されるタイミング情報およびアシスト情報を含んだスモールセル検出指示を受信する工程と、
前記タイミング情報に従って前記スモールセルから送信されるスモールセル検出参照信号に含まれる同期信号を検出する工程と、
前記検出した同期信号と前記アシスト情報に従ってスモールセル検出参照信号に含まれる測定用参照信号を測定する工程と、を有し、
前記タイミング情報には、前記スモールセル検出参照信号のオフセット、周期および期間の値が含まれ、
前記アシスト情報には、スモールセルまたは送信ポイントの物理セルID、前記測定用参照信号に用いられるスクランブルID、時間周波数リソース構成インデックスおよびサブフレームオフセットの値の少なくとも1つを含めまたはいずれも含まないことを特徴とする無線通信方法。
Priority Applications (7)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN201580023753.7A CN106416376B (zh) | 2014-05-08 | 2015-04-17 | 用户终端、基站以及无线通信方法 |
JP2016517854A JP6303000B2 (ja) | 2014-05-08 | 2015-04-17 | ユーザ端末、基地局および無線通信方法 |
ES15789916T ES2699306T3 (es) | 2014-05-08 | 2015-04-17 | Terminal de usuario, estación base y procedimiento de comunicación por radio |
EP18194231.9A EP3432647A1 (en) | 2014-05-08 | 2015-04-17 | Method and device for detection of reference signals in small cells |
US15/308,890 US10368296B2 (en) | 2014-05-08 | 2015-04-17 | User terminal, base station and radio communication method |
EP15789916.2A EP3142422B1 (en) | 2014-05-08 | 2015-04-17 | User terminal, base station, and wireless communication method |
US16/266,730 US11026157B2 (en) | 2014-05-08 | 2019-02-04 | User terminal, base station and radio communication method |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2014097143 | 2014-05-08 | ||
JP2014-097143 | 2014-05-08 |
Related Child Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US15/308,890 A-371-Of-International US10368296B2 (en) | 2014-05-08 | 2015-04-17 | User terminal, base station and radio communication method |
US16/266,730 Continuation US11026157B2 (en) | 2014-05-08 | 2019-02-04 | User terminal, base station and radio communication method |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2015170569A1 true WO2015170569A1 (ja) | 2015-11-12 |
Family
ID=54392422
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2015/061894 WO2015170569A1 (ja) | 2014-05-08 | 2015-04-17 | ユーザ端末、基地局および無線通信方法 |
Country Status (6)
Country | Link |
---|---|
US (2) | US10368296B2 (ja) |
EP (2) | EP3142422B1 (ja) |
JP (1) | JP6303000B2 (ja) |
CN (1) | CN106416376B (ja) |
ES (1) | ES2699306T3 (ja) |
WO (1) | WO2015170569A1 (ja) |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP3141042A1 (en) * | 2014-05-09 | 2017-03-15 | Telefonaktiebolaget LM Ericsson (publ) | Discovery signal design in a radio communications network |
GB2544120A (en) * | 2015-11-09 | 2017-05-10 | Tcl Communication Ltd | Systems and methods for measuring signals |
IL265237A (en) * | 2016-09-12 | 2019-05-30 | Guangdong Oppo Mobile Telecommunications Corp Ltd | Method for transmitting run signal and device |
JP2019523590A (ja) * | 2016-07-01 | 2019-08-22 | グァンドン オッポ モバイル テレコミュニケーションズ コーポレーション リミテッドGuangdong Oppo Mobile Telecommunications Corp., Ltd. | 信号検出方法及び装置 |
WO2020007822A1 (en) | 2018-07-02 | 2020-01-09 | Conservatoire National Des Arts Et Metiers (Cnam) | Bismuth metallic (0) nanoparticles, process of manufacturing and uses thereof |
Families Citing this family (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US10057839B2 (en) * | 2013-09-27 | 2018-08-21 | Samsung Electronics Co., Ltd. | Methods and apparatus for discovery signals for LTE advanced |
US9883415B2 (en) * | 2014-05-28 | 2018-01-30 | Lg Electronics Inc. | Method for performing discovery signal measurements in wireless communication system and user equipment thereof |
US10440550B2 (en) | 2015-08-06 | 2019-10-08 | Samsung Electronics Co., Ltd. | Method and apparatus for performing inter-carrier D2D communication |
US10708028B2 (en) * | 2017-03-08 | 2020-07-07 | Samsung Electronics Co., Ltd. | Method and apparatus for reference signals in wireless system |
WO2018173232A1 (ja) * | 2017-03-23 | 2018-09-27 | 株式会社Nttドコモ | ユーザ端末及び無線通信方法 |
US10666485B2 (en) * | 2017-05-03 | 2020-05-26 | Apple Inc. | Synchronization signal block index signaling |
EP3471296A4 (en) | 2017-06-16 | 2020-03-25 | LG Electronics Inc. -1- | SYNCHRONIZATION SIGNAL RECEIVING METHOD AND APPARATUS THEREOF |
CA3061830A1 (en) * | 2017-06-16 | 2018-12-20 | Telefonaktiebolaget Lm Ericsson (Publ) | Method and apparatus for measurement report |
CN111201760B (zh) * | 2017-08-10 | 2023-04-25 | 株式会社Ntt都科摩 | 用户终端以及无线通信方法 |
CN109495413B (zh) * | 2017-09-11 | 2022-04-01 | ***通信有限公司研究院 | 同步信号块的传输、小区质量的测量方法、基站及终端 |
JP7104145B2 (ja) * | 2018-05-10 | 2022-07-20 | 株式会社Nttドコモ | ユーザ端末 |
Family Cites Families (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US9054842B2 (en) * | 2011-02-14 | 2015-06-09 | Qualcomm Incorporated | CRS (common reference signal) and CSI-RS (channel state information reference signal) transmission for remote radio heads (RRHs) |
KR101579665B1 (ko) * | 2011-06-23 | 2015-12-22 | 후지쯔 가부시끼가이샤 | 이동체 통신 시스템, 이동국 장치, 기지국 장치 및 측정 방법 |
WO2013155680A1 (en) * | 2012-04-18 | 2013-10-24 | Renesas Mobile Corporation | Mechanism for controlling discovery of small cells |
CN103391530A (zh) * | 2012-05-11 | 2013-11-13 | 中兴通讯股份有限公司 | 异构网络中用户设备配置方法及*** |
TWI558257B (zh) * | 2012-07-31 | 2016-11-11 | 財團法人工業技術研究院 | 小型基地台檢測方法以及使用所述方法的裝置 |
TWI580235B (zh) * | 2012-09-26 | 2017-04-21 | 內數位專利控股公司 | 在長期發展(lte)系統中操作之方法、系統及裝置 |
US20150271743A1 (en) | 2012-10-08 | 2015-09-24 | Nokia Solutions And Networks Oy | Small Cell Discovery |
JP5982623B2 (ja) | 2012-11-13 | 2016-08-31 | ホシザキ株式会社 | 洗浄装置 |
EP2982189B1 (en) * | 2013-04-03 | 2017-12-27 | Google Technology Holdings LLC | Methods and device for cell discovery |
US9749075B2 (en) * | 2013-09-27 | 2017-08-29 | Mediatek Inc. | Methods of discovery and measurements for small cells in OFDM/OFDMA systems |
US9585103B2 (en) * | 2014-01-30 | 2017-02-28 | Qualcomm Incorporated | Techniques for controlling transmission power in shared radio frequency spectrum |
CN105706385B (zh) * | 2014-03-07 | 2018-09-25 | Lg 电子株式会社 | 无线通信***中通过终端接收发现参考信号的方法与设备 |
-
2015
- 2015-04-17 EP EP15789916.2A patent/EP3142422B1/en active Active
- 2015-04-17 JP JP2016517854A patent/JP6303000B2/ja active Active
- 2015-04-17 US US15/308,890 patent/US10368296B2/en active Active
- 2015-04-17 CN CN201580023753.7A patent/CN106416376B/zh active Active
- 2015-04-17 WO PCT/JP2015/061894 patent/WO2015170569A1/ja active Application Filing
- 2015-04-17 ES ES15789916T patent/ES2699306T3/es active Active
- 2015-04-17 EP EP18194231.9A patent/EP3432647A1/en active Pending
-
2019
- 2019-02-04 US US16/266,730 patent/US11026157B2/en active Active
Non-Patent Citations (4)
Title |
---|
HIROKI HARADA: "A Study on Discovery Signal for Efficient Macro-assisted Small Cell Discovery Mechanism in LTE SCE", IEICE TECHNICAL REPORT, vol. 113, no. 361, 11 December 2013 (2013-12-11), pages 53 - 58, XP008184389 * |
MEDIATEK INC: "Performance evaluation for small cell discovery using legacy reference signals", 3GPP TSG-RAN WG1 #72BIS R1-131684, 16 April 2013 (2013-04-16), XP050697458 * |
NTT DOCOMO: "Views on network assistance for Rel. 12 discovery procedure", 3GPP TSG RAN WG1 MEETING #76BIS R1-141465, 22 March 2014 (2014-03-22), pages 1 - 4, XP050813892 * |
See also references of EP3142422A4 * |
Cited By (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP3141042B1 (en) * | 2014-05-09 | 2022-04-13 | Telefonaktiebolaget LM Ericsson (publ) | Discovery signal design in a radio communications network |
EP3141042A1 (en) * | 2014-05-09 | 2017-03-15 | Telefonaktiebolaget LM Ericsson (publ) | Discovery signal design in a radio communications network |
GB2544120B (en) * | 2015-11-09 | 2021-02-24 | Tcl Communication Ltd | Systems and methods for measuring signals |
GB2544120A (en) * | 2015-11-09 | 2017-05-10 | Tcl Communication Ltd | Systems and methods for measuring signals |
JP2019523590A (ja) * | 2016-07-01 | 2019-08-22 | グァンドン オッポ モバイル テレコミュニケーションズ コーポレーション リミテッドGuangdong Oppo Mobile Telecommunications Corp., Ltd. | 信号検出方法及び装置 |
US11153836B2 (en) | 2016-07-01 | 2021-10-19 | Guangdong Oppo Mobile Telecommunications Corp., Ltd. | Method and device for signal detection |
EP3496351A4 (en) * | 2016-09-12 | 2019-08-07 | Guangdong Oppo Mobile Telecommunications Corp., Ltd. | PILOT SIGNAL TRANSMISSION METHOD AND DEVICE |
RU2713411C1 (ru) * | 2016-09-12 | 2020-02-05 | Гуандун Оппо Мобайл Телекоммьюникейшнз Корп., Лтд. | Способ и устройство для передачи пилот-сигнала |
CN112929144A (zh) * | 2016-09-12 | 2021-06-08 | Oppo广东移动通信有限公司 | 导频信号的传输方法和设备 |
US11233613B2 (en) | 2016-09-12 | 2022-01-25 | Guangdong Oppo Mobile Telecommunications Corp., Ltd. | Pilot signal transmission method and device |
AU2016422767B2 (en) * | 2016-09-12 | 2022-03-17 | Guangdong Oppo Mobile Telecommunications Corp., Ltd. | Pilot signal transmission method and device |
IL265237A (en) * | 2016-09-12 | 2019-05-30 | Guangdong Oppo Mobile Telecommunications Corp Ltd | Method for transmitting run signal and device |
WO2020007822A1 (en) | 2018-07-02 | 2020-01-09 | Conservatoire National Des Arts Et Metiers (Cnam) | Bismuth metallic (0) nanoparticles, process of manufacturing and uses thereof |
Also Published As
Publication number | Publication date |
---|---|
JP6303000B2 (ja) | 2018-03-28 |
JPWO2015170569A1 (ja) | 2017-04-20 |
EP3142422A4 (en) | 2018-01-10 |
US20190174399A1 (en) | 2019-06-06 |
EP3432647A1 (en) | 2019-01-23 |
US20170064613A1 (en) | 2017-03-02 |
EP3142422B1 (en) | 2018-10-24 |
CN106416376A (zh) | 2017-02-15 |
ES2699306T3 (es) | 2019-02-08 |
US11026157B2 (en) | 2021-06-01 |
US10368296B2 (en) | 2019-07-30 |
EP3142422A1 (en) | 2017-03-15 |
CN106416376B (zh) | 2022-08-30 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
JP6303000B2 (ja) | ユーザ端末、基地局および無線通信方法 | |
US10045242B2 (en) | User terminal, radio base station and inter-frequency measurement method | |
US10321343B2 (en) | User terminal, radio base station, radio communication method and radio communication system | |
CN107148791B (zh) | 终端、无线基站以及无线通信方法 | |
US20170223558A1 (en) | Methods and apparatuses for measurement enhancement in communication system | |
US9693291B2 (en) | User terminal, radio base station and communication control method | |
US20200187104A1 (en) | Terminal, radio communication method, and base station | |
JPWO2015174437A1 (ja) | 無線基地局、ユーザ端末および無線通信システム | |
JPWO2016017328A1 (ja) | ユーザ端末及び無線通信方法 | |
WO2014115459A1 (ja) | 無線通信システム、無線通信方法、無線基地局及びユーザ端末 | |
US20160242123A1 (en) | Base station, user terminal and radio communication control method | |
EP3029978A1 (en) | Wireless base station, user terminal, and wireless communication method | |
JP6399765B2 (ja) | ユーザ端末、無線基地局及び無線通信方法 | |
EP3029982A1 (en) | Base station, user terminal, and wireless communication control method |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
121 | Ep: the epo has been informed by wipo that ep was designated in this application |
Ref document number: 15789916 Country of ref document: EP Kind code of ref document: A1 |
|
WWE | Wipo information: entry into national phase |
Ref document number: 15308890 Country of ref document: US |
|
ENP | Entry into the national phase |
Ref document number: 2016517854 Country of ref document: JP Kind code of ref document: A |
|
NENP | Non-entry into the national phase |
Ref country code: DE |
|
REEP | Request for entry into the european phase |
Ref document number: 2015789916 Country of ref document: EP |
|
WWE | Wipo information: entry into national phase |
Ref document number: 2015789916 Country of ref document: EP |