WO2013114832A1 - 無線通信システムおよびレポーティング設定制御方法 - Google Patents
無線通信システムおよびレポーティング設定制御方法 Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W24/00—Supervisory, monitoring or testing arrangements
- H04W24/10—Scheduling measurement reports ; Arrangements for measurement reports
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/022—Site diversity; Macro-diversity
- H04B7/024—Co-operative use of antennas of several sites, e.g. in co-ordinated multipoint or co-operative multiple-input multiple-output [MIMO] systems
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
- H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
- H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
- H04B7/0619—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal using feedback from receiving side
- H04B7/0621—Feedback content
- H04B7/0626—Channel coefficients, e.g. channel state information [CSI]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
- H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
- H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
- H04B7/0619—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal using feedback from receiving side
- H04B7/0621—Feedback content
- H04B7/063—Parameters other than those covered in groups H04B7/0623 - H04B7/0634, e.g. channel matrix rank or transmit mode selection
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
- H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
- H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
- H04B7/0619—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal using feedback from receiving side
- H04B7/0636—Feedback format
- H04B7/0639—Using selective indices, e.g. of a codebook, e.g. pre-distortion matrix index [PMI] or for beam selection
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0032—Distributed allocation, i.e. involving a plurality of allocating devices, each making partial allocation
- H04L5/0035—Resource allocation in a cooperative multipoint environment
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0053—Allocation of signalling, i.e. of overhead other than pilot signals
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0053—Allocation of signalling, i.e. of overhead other than pilot signals
- H04L5/0057—Physical resource allocation for CQI
Definitions
- the present invention relates to a wireless communication system that performs coordinated transmission between multiple transmission points, and more particularly to a system and method for controlling reporting settings.
- Coordinated transmission between multiple transmission points is also called CoMP transmission (CoordinatedordinateMulti-point transmission), and aims to improve the throughput and / or average cell throughput of user terminals located at the cell edge.
- transmission point includes a device having a wireless transmission function such as a base station for controlling a cell or a sector or a small wireless unit (RRH: Remote Radio Head).
- RRH Remote Radio Head
- radio base station or “radio unit” having such a radio transmission function, or a “transmission cell” or “transmission sector” generated by them is used.
- JT shown in FIG. 1A is a method for improving characteristics by simultaneously transmitting signals from a plurality of transmission points.
- the DPS shown in FIG. 1B is a method for improving characteristics by instantaneously selecting and switching transmission points with good channel quality.
- CS / CB shown in FIG. 1 (C) cooperates between transmission points so that interference from adjacent transmission points becomes small for a UE (User Equipment, also called a mobile station) that is a target of CoMP transmission. This is a method for improving characteristics by selecting a UE and performing radio resource allocation (scheduling).
- the CSI indicates an identifier CQI (Channel Quality Indicator) indicating channel quality, information on a channel covariance matrix (Channel co-variance information), an identifier PMI (Precoding Matrix Indicator) indicating an optimal precoding matrix, and an optimal rank.
- CQI Channel Quality Indicator
- PMI Precoding Matrix Indicator
- An identifier RI Rank Indicator
- the UE notifies the network of channel state information between each transmission point and the UE, and is also called Per transmission point (TP) CSI feedback or Per CSI RS resource feedback.
- TP Per transmission point
- CSI RS is a reference signal (ReferenceCSignal) for measuring CSI, and it is considered that transmission is performed with resources orthogonal to each transmission point.
- This first feedback method can be applied to DPS and CS / CB.
- the phase difference of the channel between the transmission points is reported by feedback.
- Per transmission point CSI feedback with inter transmission point also called TP
- TP Inter transmission point
- Per CSI RS resource resource with inter CSI RS resource feedback By performing signal transmission by adjusting the phase based on the phase difference for which each transmission point is notified of feedback, the UE can synthesize the signals in phase.
- the second feedback method can be applied to the above-described Coherent JT that combines the signals from a plurality of transmission points in phase.
- the third feedback method is to notify the channel state information obtained by combining the transmission points by feedback when the transmission points transmit simultaneously, and is also called Aggregated CSI feedback or Aggregated feedback across multi CSI RSsresources. 3
- This third feedback method can be applied to CoherentTJT and Non-Coherent JT, which combines signals without matching the phase of signals between transmission points.
- reporting setting information in which a combination of transmission points to be reported (hereinafter referred to as a reporting set), a feedback method, etc. is set between the transmission point (network) and the UE. Need to share.
- Non-Patent Document 4 a method for sharing such reporting setting information
- a reporting set is notified from a transmission point to a UE by RRC (Radio Resource Control) signaling (see Non-Patent Document 4).
- RRC Radio Resource Control
- the transmission points TP1 and TP2 are selected as CSI feedback destinations.
- the network notifies the UE semi-static that the reporting set is TP1 and TP2 using RRC signaling.
- the UE notified of the reporting set measures CSI for TP1 and TP2, and notifies the measured CSI to TP1 and TP2 by feedback.
- 3GPP TR.36.819 “Coordinated multipoint operation for LTE physical layeraspects (Section 5.1.3)” 3GPP R1-112224, “CoMP Performance Analysis in Scenario3 and 4 for non full buffer traffic model,” Intel 3GPP R1-114352, “Final Report of 3GPP TSG RAN WG1 # 66bis v1.1.0 (Section7.5.2)” 3GPP R1-113354, “Hierarchical Feedback for DL CoMP and DL MIMO,” Ericsson, ST-Ericsson
- RRC signaling is a means for notifying control information related to the RRC layer, and in order to notify semi-static (with a cycle of about 100 ms at the shortest), a change in traffic volume, UE distribution, etc. It is impossible to follow the changes in the environment and to set the optimal reporting. For this reason, the above-described reporting setting method according to Non-Patent Document 4 has a problem that the effect of improving characteristics by CoMP transmission is reduced.
- An object of the present invention is to provide a reporting setting control method capable of quickly changing a reporting setting in a system that performs CoMP transmission, and a wireless communication system using the same.
- a radio communication network is a radio communication system of a coordinated transmission method in which a plurality of transmitting stations constituting a network cooperate to transmit, wherein the network transmits a plurality of reporting setting information related to channel state information.
- a notification is made to a receiving station that is a target of the system, and the transmitting station and the receiving station share reporting setting information to be applied among the plurality of reporting setting information.
- a mobile station is a mobile station that is a target of a cooperative transmission method in a wireless communication system using a cooperative transmission method in which a plurality of transmission stations that form a network cooperate to transmit a plurality of channel state information from the network.
- a radio base station is a radio base station in a radio communication system of a coordinated transmission scheme that transmits to a mobile station in cooperation with other radio base stations that constitute a network, and is a target of the coordinated transmission scheme.
- a control means for controlling the reporting setting information regarding channel state information.
- a reporting setting control method is a reporting setting control method in a radio communication system of a cooperative transmission scheme in which a plurality of transmitting stations constituting a network transmit in cooperation, wherein the network includes a plurality of reporting related to channel state information.
- the setting information is notified to a receiving station that is a target of the cooperative transmission method, and the transmitting station and the receiving station share reporting setting information to be applied among the plurality of reporting setting information.
- a plurality of reporting setting information is notified to a receiving station that is a target of CoMP transmission, so that the reporting setting can be quickly changed, and changes in traffic volume and UE distribution can be followed. Reporting setting is possible.
- FIG. 1A, 1B, and 1C are schematic network diagrams showing JT, DPS, and CS / CB CoMP transmission schemes, respectively, and FIG. 1D is a reporting set notification method. It is a network diagram for demonstrating.
- FIG. 2 is a block diagram showing a main functional configuration on the network side in the wireless communication system according to the first embodiment of the present invention.
- FIG. 3 is a block diagram showing the main functional configuration of the mobile station in the wireless communication system shown in FIG.
- FIG. 4 is a flowchart showing control operations on the network side and the mobile station side in the wireless communication system shown in FIG.
- FIG. 5A is a network diagram for explaining a first embodiment of the reporting setting control method in the wireless communication system shown in FIG. 2, and FIG.
- FIG. 5B is an example of a reporting setting candidate for performing the RRC signaling.
- FIG. 5C is a diagram illustrating another example of a reporting setting candidate.
- FIG. 6 is a schematic diagram for explaining a reporting setting notification method using L1 / L2 signaling in the first embodiment shown in FIG.
- FIG. 7A is a network diagram for explaining a second embodiment of the reporting setting control method in the wireless communication system shown in FIG. 2, and
- FIG. 7B is an example of a reporting setting candidate for performing the RRC signaling.
- FIG. 7C is a diagram illustrating another example of the reporting setting candidate.
- FIG. 8 is a schematic diagram for explaining a reporting setting notification method using L1 / L2 signaling in the second embodiment shown in FIG. FIG.
- FIG. 9A is a network diagram for explaining a third embodiment of the reporting setting control method in the wireless communication system shown in FIG. 2, and FIG. 9B is an example of a reporting setting candidate for performing the RRC signaling.
- FIG. 9C is a diagram showing another example of the reporting setting candidate.
- FIG. 10 is a schematic diagram for explaining a reporting setting notification method using L1 / L2 signaling in the third embodiment shown in FIG.
- FIG. 11 is a block diagram showing main functional configurations of a network and a mobile station in the wireless communication system according to the second embodiment of the present invention.
- FIG. 12 is a flowchart showing control operations on the network side and the mobile station side in the wireless communication system shown in FIG. FIG.
- FIG. 13 is a schematic diagram showing a feedback method according to the fourth embodiment of the reporting setting control method in the wireless communication system shown in FIG.
- FIG. 14 is a schematic diagram showing a feedback method according to the fifth embodiment of the reporting setting control method in the wireless communication system shown in FIG.
- FIG. 15 is a schematic diagram showing a feedback method according to the sixth embodiment of the reporting setting control method in the wireless communication system shown in FIG.
- FIG. 16 is a block diagram showing main functional configurations of a network and a mobile station in the wireless communication system according to the third embodiment of the present invention.
- the network notifies the mobile station of a plurality of reporting setting information regarding the channel state information, and the reporting setting information to be applied from among them is shared between the network and the mobile station.
- the reporting setting can be quickly switched according to changes in the radio environment, the reporting setting can be optimized with respect to changes in the network traffic volume and UE distribution, and the effect of improving the characteristics of CoMP transmission can be increased.
- reporting setting is realized by two-step signaling.
- information on a plurality of reporting settings is notified from the transmission point to the UE using RRC signaling.
- information on the reporting settings to be applied is notified from the transmission point to the UE using layer 1 / layer 2 (L1 / L2) signaling.
- L1 / L2 signaling is a control signal related to the physical layer, and an update cycle of about several milliseconds (ms) is assumed. Since the RRC signaling period is about 100 ms at the shortest, the RRC signaling notification interval is larger than the L1 / L2 signaling notification interval. Therefore, according to changes in radio conditions, network load, etc., by notifying the UE of a plurality of reporting configuration candidates at a certain signaling notification interval and determining which candidate to apply by signaling at a shorter notification interval Reporting settings can be changed.
- the system according to the first embodiment of the present invention includes a CoMP control device 300 and a plurality of transmission points TP.
- the CoMP control device 300 corresponds to a plurality of transmission points TP. Control reporting settings.
- three transmission points are provided, and only the transmission point TP is illustrated.
- a transmission / reception unit including the transmission point TP, a radio unit, or a radio base station is provided.
- the functional configuration of the mobile station UE that performs radio communication with each transmission point TP is illustrated in FIG. 3.
- the CoMP control apparatus 300 includes a reporting setting candidate generation unit 301 and a reporting setting unit 302, and the reporting setting unit 302 includes a feedback method determination unit 303 and a reporting set determination unit 304. Furthermore, the CoMP control apparatus 300 has a control unit (not shown) and controls a reporting setting operation described later. Transmission points TP1 to TP3 are provided with RRC signaling generators 201.1-201.3, L1 / L2 signaling generators 202.1-202.3, and radio units 203.1-203.3, respectively. Yes.
- the reporting setting candidate generation unit 301 of the CoMP control apparatus 300 generates a plurality of reporting setting candidates to be notified to the UE by RRC signaling, and sends them to the reporting setting unit 302 and the RRC signaling generation unit 201.1-201.3 of the transmission point Output each.
- the reporting setting unit 302 determines a reporting setting to be actually used from the reporting setting candidates input from the reporting setting candidate generation unit 301.
- the feedback method determination unit 303 determines a feedback method corresponding to the CoMP transmission method to be used
- the reporting set determination unit 304 determines a transmission point to be a reporting target.
- the reporting setting determined by the reporting setting unit 302 is transmitted to the L1 / L2 signaling generation unit 202.1-202.3 of the transmission point.
- the RRC signaling generation unit 201.1-201.3 generates the information of the reporting setting candidate input from the reporting setting candidate generation unit 301 as the information of the RRC signaling, and the radio unit 203.1-203.3. Output to.
- the radio unit 203.1-203.3 notifies the UE of the input reporting setting candidate information using RRC signaling.
- the L1 / L2 signaling generation unit 202.1-202.3 of each transmission point generates the reporting setting received from the reporting setting unit 302 as L1 / L2 signaling information and outputs it to the radio unit 203.1-203.3. To do.
- the radio unit 203.1-203.3 notifies the UE of the reporting configuration using L1 / L2 signaling.
- a UE 400 which is a mobile station in the system according to the present embodiment, includes a radio unit 401, a CSI measurement unit 402, and a feedback generation unit 403, and further controls a reporting setting operation not shown.
- Radio section 401 receives RRC signaling and L1 / L2 signaling from the transmission point, and outputs information related to reporting settings to CSI measurement section 402.
- the CSI measurement unit 402 measures CSI according to the input information regarding the reporting setting, and outputs the measurement result to the feedback generation unit 403.
- CSI is an identifier indicating channel quality (CQI: Channel Quality Indicator), information on channel covariance matrix (Channel co-variance information), an identifier indicating an optimal precoding matrix (PMI: Precoding Matrix Indicator), an optimal It includes an identifier (RI: RankRaIndicator) indicating the rank.
- the feedback generation unit 403 generates a feedback signal from the input CSI measurement result and outputs it to the radio unit 401.
- the radio unit 401 notifies the network (radio unit including the transmission point TP or radio base station) of CSI by feedback.
- the reporting setting candidate generation unit 301 of the CoMP control apparatus 300 generates a plurality of reporting setting candidates (operation 500), and transmits them to the UE 400 through the transmission point TP by RRC signaling (operation 501).
- the radio unit 401 of the UE 400 reads the reporting setting candidate information from the RRC signaling received from the transmission point TP, and the CSI measuring unit 402 holds the reporting setting candidate (operation 510).
- the reporting setting to be actually used is selected from the reporting setting candidates (operation 502).
- the network determines reporting settings using information known on the network side. For example, the reporting setting to be applied is determined according to the traffic volume at each transmission point.
- the selected reporting configuration is notified to the UE 400 by L1 / L2 signaling (operation 503), and the UE 400 receives the notified reporting configuration (operation 511), so that the reporting configuration is set on the network side and the UE side. Shared.
- the UE 400 measures CSI according to the notified reporting setting (operation 512), and notifies the measured CSI to the network by feedback (operation 513).
- the wireless unit or the wireless base station including the transmission point TP on the network side receives the CSI information notified by feedback (operation 504).
- the network notifies the UE of a plurality of reporting settings by RRC signaling, selects one reporting setting to be applied from the plurality of reporting settings, and selects the selected 1
- An identifier indicating one reporting configuration is notified to the UE by L1 / L2 signaling.
- the reporting setting includes information on a combination of transmission points to be reported (reporting set) and a feedback method in the reporting set.
- RRC signaling for notifying a plurality of reporting configurations will be described with reference to FIG.
- FIG. 5A a case where one UE exists and three transmission points (TP1, TP2, TP3) cooperate will be described as an example.
- two reporting setting candidates are defined.
- TP1 and TP2 are the reporting set REP1
- TP2 and TP3 are the reporting set REP2.
- FIG. 5B shows an example of a signal format when a plurality of reporting setting information is notified by RRC signaling.
- the reporting setting information is, for example, information included in CQI-ReportingConfig, and includes information on a reporting interval and a feedback method (also referred to as feedback mode).
- CSI ⁇ RS resource number, PCI (Physical Cell ID), etc. are included as information indicating the transmission point in CQI-ReportingConfig.
- CSI RS is a reference signal for measuring CSI, and transmission using orthogonal resources at each transmission point is considered.
- CSI RS resources # 1, # 2, and # 3 are identifiers indicating the resource positions of CSI RS transmitted from TP1, TP2, and TP3, respectively.
- CSI ⁇ ⁇ ⁇ ⁇ RS resources orthogonal to each other with a maximum of 32 patterns of time, frequency, or code are prepared, and each resource corresponds to a CSI RS resource number. Since the CSI RS resource and its number are known on the network side and the UE side, if the network notifies the UE of the number of the CSI RS resource, the UE can know which CSI RS resource should measure the CSI.
- an identifier used during L1 / L2 signaling is assigned to each reporting setting candidate. In this example, the identifier “0” is assigned to the reporting setting 1, and the identifier “1” is assigned to the reporting setting 2.
- FIG. 5C shows another example of a signal format when notifying a plurality of reporting settings by RRC signaling.
- the reporting setting includes not only the reporting set REP but also a feedback method.
- Aggregated CSI which is a feedback method for executing JT of the CoMP transmission scheme, is performed on the reporting set REP1 of TP1 and TP2, and DPS or CS / CB of the CoMP transmission scheme is performed on the reporting set REP2 of TP2 and TP3.
- Per TP CSI is set for each feedback method.
- the CSI RS resource number is used as information indicating each transmission point, PCI (Physical Cell ID) or the like may be used.
- the selected reporting setting is notified by L1 / L2 signaling.
- Information on downlink L1 / L2 signaling is called DCI (Downlink Control Information) and is transmitted by PDCCH (Physical Downlink Control Channel).
- the DCI includes scheduling information indicating the location of the allocation resource of each UE, modulation scheme, MCS (Modulation Coding Scheme) information indicating the coding rate, and the like.
- identifiers “0” and “1” indicating the reporting setting are inserted into the DCI in all TTIs (Transmission Time Interval). Therefore, the identifier “0” indicating reporting setting 1 is notified in TTI0 and TTI1, and the identifier “1” indicating reporting setting 2 is notified in TTI2 and TTI3.
- the identifier indicating the reporting setting is inserted in all TTIs.
- the identifier indicating the reporting setting may be inserted only in the TTI for which the reporting setting is changed (for example, only TTI0 and TTI2).
- Second Example The difference between the second example described below and the first example of the first embodiment described above is as follows.
- the UE In the RRC signaling of the first embodiment, the UE is notified of the reporting set and the feedback method in the reporting set, but in the second embodiment, the transmission point to be reported and the feedback method at the transmission point are notified.
- the L1 / L2 signaling of the first embodiment one of the reporting settings composed of a combination of a plurality of transmission points is selected and its identifier is notified, but in the second embodiment, it is notified by RRC signaling. In the reporting setting for each transmission point, only the information of the reporting setting to be applied is notified to the UE.
- the reporting setting 1 is TP1
- the reporting setting 2 is TP2
- the reporting setting 3 is TP3.
- FIG. 7B shows an example of a signal format when reporting setting candidates are notified by RRC signaling.
- a CSI RS resource number is used, and an identifier used during L1 / L2 signaling is assigned to each transmission point.
- the identifier “00” is assigned to the reporting setting 1
- the identifier “01” is assigned to the reporting setting 2
- the identifier “10” is assigned to the reporting setting 3.
- FIG. 7C shows another example of the signal format when reporting setting candidates are notified by RRC signaling.
- FIG. 7C includes not only a transmission point but also a feedback method.
- reporting setting 1 if TP1 is a serving transmission point, feedback between the serving transmission point and the UE is set.
- Per TP CSI and Inter TP CSI which are feedback methods for performing JT are set.
- reporting setting 3 Per TP CSI, which is a feedback method for performing CS / CB, is set.
- the CSI ⁇ ⁇ RS resource number is used as information indicating each transmission point, but PCI (Physical Cell ID) or the like may be used.
- the identifier of the applied reporting setting only is notified by L1 / L2 signaling when the reporting setting is updated. Therefore, in TTI0, identifiers “00” and “01” indicating the reporting settings 1 and 2 are transmitted, and in the TTI2 updated to the reporting settings 2, identifiers “00” and “10” indicating the reporting settings 1 and 3 are transmitted. ".
- a new identifier is assigned to each reporting setting.
- the CSI-RS resource number and PCI which are existing information, may be used as the reporting setting identifier.
- the identifier indicating the reporting setting is transmitted only to the TTI for which the reporting setting is to be changed (only TTI0 and TTI2).
- the identifier indicating the reporting setting in all the TTIs. May be inserted.
- reporting can be set for each transmission point, even if the number of elements of the reporting set increases, it is possible to suppress an increase in overhead of RRC signaling.
- the setting of the reporting set of the third embodiment is the same as that of the second embodiment, and the description thereof is omitted.
- FIG. 9B shows an example of a signal format when reporting setting candidates are notified by RRC signaling.
- the CSICRS resource number is used as information indicating each transmission point.
- the reporting applicability of all the reporting setting candidates is transmitted, it is not necessary to attach a unique identifier to each reporting setting as in the first and second embodiments.
- FIG. 9C is another example of a signal format when reporting setting candidates are notified by RRC signaling.
- the transmission point not only the transmission point but also a feedback method is included.
- the reporting setting 1 if TP1 is the serving transmission point, the existing feedback between the serving transmission point and the UE is set, the reporting setting 2 is a feedback method for performing JT, and the reporting setting 3 is for performing CS / CB. Set the feedback method for each.
- FIG. 10 shows an example in which an identifier indicating whether or not to report on each of a plurality of reporting settings is notified by L1 / L2 signaling when the reporting settings are updated.
- the identifier “0” is not reporting
- the identifier “0” is reporting
- the notification order is reporting settings 1, 2, and 3. Therefore, in TTI0, since the notification of applying reporting settings 1 and 2 is performed, identifiers “1”, “1”, and “0” are transmitted in order, and in TTI2, reporting settings 1 and 3 are updated. Identifiers “1”, “0”, and “1” are transmitted.
- the reporting order of each reporting setting has been described as being fixed to reporting settings 1, 2, and 3.
- the CSI RS resource number and PCI which are existing information, are set as reporting settings. May be transmitted simultaneously as identifiers.
- the identifier indicating the reporting setting is transmitted only to the TTI for which the reporting setting is to be changed (only TTI0 and TTI2). However, as in the first embodiment, the identifier indicating the reporting setting for all TTIs. May be inserted.
- the third embodiment similarly to the second embodiment, since reporting can be set for each transmission point, an increase in overhead of RRC signaling can be suppressed. Furthermore, since the identifiers related to all of the plurality of reporting settings are respectively notified by L1 / L2 signaling, the overhead can be reduced as compared with the RRC signaling of the second embodiment.
- the network can optimize the reporting settings using information known on the network side.
- the system according to the second embodiment of the present invention notifies information on a plurality of reporting settings from the transmission point to the UE using RRC signaling in the first step.
- the second step is different from the first embodiment.
- information on the reporting setting to be applied is notified from the network to the UE.
- information on the reporting setting to be applied is notified from the UE to the transmission point by feedback. Note that an update cycle of several ms to several tens of ms is assumed for feedback, and the shortest cycle of RRC signaling is about 100 ms, so the notification interval of RRC signaling is larger than the feedback time interval.
- the system according to the second embodiment of the present invention includes a CoMP control device 700, a plurality of transmission points TP, and a UE 800 that is a user terminal.
- the CoMP control device 700 performs RRC signaling.
- the UE notifies the UE of reporting setting candidates, determines one candidate to apply from the candidates notified by the UE, and feeds back to the transmission point.
- three transmission points are provided, and only the transmission point TP of each transmission point is illustrated.
- the CoMP control apparatus 700 includes a reporting setting candidate generation unit 701, and RRC signaling generation units 601.1-601.3 and radio units 602.1-602.3 are provided at the transmission points TP1-TP3, respectively. .
- the reporting setting candidate generation unit 701 of the CoMP control device 700 generates CSI reporting setting candidates to be notified to the UE 800 by RRC signaling, and outputs the CSI reporting setting candidates to the RRC signaling generation units 601.1 to 601.3 of the transmission points.
- the RRC signaling generation unit 601.1-601.3 generates information on the reporting setting candidate input from the reporting setting candidate generation unit 701 as RRC signaling information, and generates a radio unit 602.1-602.3. Output to.
- the radio units 602.1-602.3 notify the UE 800 of the input reporting setting candidate information using RRC signaling.
- the UE 800 includes a radio unit 801, a CSI measurement unit 802, a reporting setting unit 803, and a feedback generation unit 806, and the reporting setting unit 803 includes a feedback method determination unit 804 and a reporting set determination unit 805.
- Radio section 801 receives RRC signaling from the transmission point, and outputs information related to reporting settings to CSI measurement section 802.
- the CSI measurement unit 802 measures CSI according to the input information regarding the reporting setting, and outputs the measurement result to the reporting setting unit 803.
- CSI is an identifier indicating channel quality (CQI: Channel Quality Indicator), information on channel covariance matrix (Channel co-variance information), an identifier indicating an optimal precoding matrix (PMI: Precoding Matrix Indicator), an optimal It includes an identifier (RI: RankRaIndicator) indicating the rank.
- CQI Channel Quality Indicator
- Channel co-variance information information on channel covariance matrix
- PMI Precoding Matrix Indicator
- RI RankRaIndicator
- the reporting setting unit 803 determines a setting to be actually applied from among the setting candidates.
- a feedback method determination unit 804 determines a feedback method corresponding to the CoMP transmission method to be used, and a reporting set determination unit 805 determines a transmission point to be reported.
- the CSI measurement result corresponding to the setting determined by the reporting setting unit 803 is output to the feedback generation unit 806.
- the feedback generation unit 806 generates a feedback signal from the input CSI measurement result, and this feedback signal is transmitted by the radio unit 801. Sent to the network (transmission point).
- the CoMP control device 700 on the network side first generates a reporting setting candidate (operation 901). Next, the generated reporting setting candidate is notified from the transmission point to the UE by RRC signaling (operation 902).
- the UE 800 on the user terminal side receives the RRC signaling, it recognizes the reporting setting candidate from the received signal and holds it (operation 910). Subsequently, the UE 800 performs CSI measurement according to the reporting setting candidate information (operation 911), and selects a setting to be used for actual reporting from the candidates (operation 912).
- the UE 800 determines reporting settings using information known on the UE side. For example, the reporting setting can be determined based on a received power difference between transmission points participating in CoMP transmission. According to the selected reporting setting, the UE 800 feeds back to the network side with information specifying the reporting setting for which the CSI has been selected (operation 913), and the transmission point on the network side receives the information by feedback (operation 903).
- the reporting setting is shared between the transmission point and the UE.
- the network notifies the UE 800 of a plurality of reporting settings by RRC signaling, selects one of the reporting settings to be applied by the UE 800, and sends an identifier indicating the selected reporting setting to the network side by feedback.
- the reporting setting includes information on a combination of transmission points to be reported (reporting set) and a feedback method in the reporting set. Since the RRC signaling for notifying a plurality of reporting settings is the same as that in the first embodiment, a description thereof will be omitted, and an example in which the selected reporting settings are notified by feedback will be described with reference to FIG.
- FIG. 13 shows an example in which feedback is performed using PUSCH (Physical Uplink Shared) Channel).
- the information fed back includes channel state information (CSI) of the transmission point selected in the reporting set.
- CSI channel state information
- identifiers “0” and “1” indicating reporting settings are inserted into feedback in all TTIs.
- the identifier “0” indicating reporting setting 1 is notified by TTI0 and TTI1
- the identifier “1” indicating reporting setting 2 is notified by TTI2 and TTI3.
- since one identifier in a plurality of reporting settings is notified by feedback, there is an advantage that the overhead of feedback in each TTI can be reduced.
- the description thereof will be omitted, and referring to FIG. 14, when the reporting setting is changed, only the identifier of the selected reporting setting is changed. Only an example of notification using feedback will be described.
- identifiers “00” and “01” indicating reporting settings 1 and 2 are notified by feedback in TTI 0 and updated to reporting setting 2.
- identifiers indicating reporting settings 1 and 3 are “00”. “,” “10” is notified by feedback.
- the identifier indicating the reporting setting is inserted in all the TTIs as in the fourth embodiment described above. May be.
- the identifier “0” indicates no reporting
- the identifier “0” indicates reporting
- the notification order is reporting settings 1, 2, and 3. Therefore, in TTI0, since the notification of applying the reporting settings 1 and 2 is performed, identifiers “1”, “1”, and “0” are transmitted in order, and in TTI2, the settings are updated to reporting settings 1 and 3. Identifiers “1”, “0”, and “1” are transmitted.
- the identifier indicating the reporting setting is transmitted only to the TTI for which the reporting setting is to be changed (only TTI0 and TTI2). However, as in the fourth embodiment, the identifier indicating the reporting setting in all the TTIs. May be inserted.
- the sixth embodiment similarly to the fifth embodiment, since reporting can be set for each transmission point, an increase in overhead of RRC signaling can be suppressed. Furthermore, since the identifiers related to all of the plurality of reporting settings are respectively notified by feedback, there is an advantage that the overhead can be reduced as compared with the RRC signaling of the fifth embodiment. As described above, according to the second embodiment, the reporting overhead is notified by RRC signaling, thereby reducing the feedback overhead. Also, the UE can determine the reporting configuration using known information on the UE side.
- the transmission point TP1 includes an RRC signaling generation unit 201.1, an L1 / L2 signaling generation unit 202.1, and a radio unit 203.1 as in the first embodiment illustrated in FIG.
- a CoMP control unit 1000 is further provided.
- the CoMP control unit 1000 includes a reporting setting candidate generation unit 1001, a reporting setting unit 1002, and an inter-point communication unit 1005.
- the reporting setting unit 1002 includes a feedback method determination unit 1003 and a reporting set determination unit 1004.
- the reporting setting candidate generation unit 1001 and the reporting setting unit 1002 have the same functions as the reporting setting candidate generation unit 301 and the reporting setting unit 302 in the first embodiment shown in FIG. Since the other trust points (TPx) have the same functional configuration, they are not shown in FIG.
- Each transmission point TP in the third embodiment includes a CoMP control unit 1000 and an inter-point communication unit 1005, and can perform coordinated transmission control while exchanging information with other transmission points TP. Since the reporting setting notification method is the same as in the first embodiment, description thereof is omitted.
- each transmission point TP can be similarly provided with a function equivalent to that of the CoMP control device 700, and the transmission points TP can be connected to each other and can communicate with each other.
- the wireless communication system according to the present invention may be a system in which the first embodiment and the second embodiment described above are mixed. For example, you may switch 1st Embodiment and 2nd Embodiment for every UE in a system.
- the network notifies each UE of an identifier indicating the first embodiment or the second embodiment using RRC signaling. The UE recognizes whether to operate in the first embodiment or the second embodiment according to the content of RRC signaling.
- the present invention is generally applicable to mobile radio systems that perform transmission in cooperation between a plurality of transmission points.
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Description
本発明の第1実施形態によれば、レポーティング設定を2ステップのシグナリングで実現する。1番目のステップでは、複数のレポーティング設定に関する情報を送信ポイントからUEへRRCシグナリングを使用して通知する。2番目のステップでは、適用するレポーティング設定に関する情報を送信ポイントからUEへレイヤ1/レイヤ2(L1/L2)シグナリングを使用して通知する。なお、L1/L2シグナリングは、物理レイヤに関連する制御信号であり、数ミリ秒(ms)程度の更新周期が想定されている。RRCシグナリングの周期は最短100ms程度であるため、RRCシグナリングの通知間隔はL1/L2シグナリングの通知間隔よりも大きい。したがって、あるシグナリングの通知間隔でレポーティング設定の複数の候補をUEへ通知し、より短い通知間隔のシグナリングによりどの候補を適用するかを決定することで、無線状況やネットワーク負荷などの変化に応じてレポーティング設定を変更することが可能となる。
図2に示すように、本発明の第1実施形態によるシステムは、CoMP制御装置300と複数の送信ポイントTPからなり、CoMP制御装置300が複数の送信ポイントTPに対してレポーティング設定制御を行う。ここでは、説明を複雑化しないために、3つの送信ポイントが設けられ、送信ポイントTPのみが図示されているが、送信ポイントTPを含む送受信部、無線部あるいは無線基地局が設けられているものとする。また、各送信ポイントTPとの間で無線通信を行う移動局UEの機能構成については図3に示す。
次に、図4を参照しながら、第1実施形態におけるネットワーク(CoMP制御装置、送信ポイント)とUEの動作について説明する。
上述した第1実施形態における第1実施例によれば、ネットワークは複数のレポーティング設定をRRCシグナリングでUEに通知し、複数のレポーティング設定の中から適用するレポーティング設定を1つ選択し、選択した1つのレポーティング設定を示す識別子をL1/L2シグナリングでUEに通知する。既に述べたように、レポーティング設定には、レポーティングを行う対象の送信ポイントの組合せ(レポーティングセット)と当該レポーティングセットにおけるフィードバック方法に関する情報が含まれている。
次に述べる第2実施例と上述した第1実施形態の第1実施例との差異は次の通りである。第1実施例のRRCシグナリングではレポーティングセットおよびレポーティングセットにおけるフィードバック方法をUEに通知したが、第2実施例ではレポーティングを行う対象の送信ポイントおよび送信ポイントにおけるフィードバック方法を通知する。さらに、第1実施例のL1/L2シグナリングでは複数の送信ポイントの組合せから構成されるレポーティング設定の1つを選択しその識別子を通知していたが、第2実施例ではRRCシグナリングで通知されたそれぞれの送信ポイントごとのレポーティング設定の中で、適用するレポーティング設定の情報のみをUEに通知する。
次に述べる第3実施例では、上述の第2実施例と同様に、レポーティングを行う対象の送信ポイントおよび送信ポイントにおけるフィードバック方法をRRCシグナリングで通知する。第2実施例との相違点は、L1/L2シグナリングの方法であり、第2実施例ではRRCシグナリングで通知されたそれぞれの送信ポイントごとのレポーティング設定の中で、適用するレポーティング設定の情報のみを通知していたが、第3実施例では、複数のレポーティング設定それぞれに対してレポーティング設定として適用するかどうかの識別子を通知する。以下、図9および図10を参照しながら説明する。
上述した第1~第3実施例はPDCCH(Physical Downlink Control Channel)を使用してL1/L2シグナリングを行う例を示したが、PDSCH(Physical Downlink Shared Channel)など他のチャネルを使用してもよい。
本発明の第2実施形態によるシステムは、第1実施形態と同様に、第1のステップで、複数のレポーティング設定に関する情報を送信ポイントからUEへRRCシグナリングを使用して通知するが、第2ステップが第1実施形態と異なる。第1実施形態では、適用するレポーティング設定に関する情報をネットワークからUEへ通知していたが、第2実施形態では、適用するレポーティング設定に関する情報をUEから送信ポイントへフィードバックで通知する。なお、フィードバックは数ms~数10ms程度の更新周期が想定されており、RRCシグナリングの最短周期は100ms程度であるから、RRCシグナリングの通知間隔はフィードバックの時間間隔よりも大きい。したがって、あるシグナリングの通知間隔でレポーティング設定の複数の候補をUEへ通知し、より短い通知間隔のシグナリングによりどの候補を適用するかを無線状況の変化に応じて決定することが可能となる。以下、図11および図12を参照しながら、本発明の第2実施形態について説明する。
図11に示すように、本発明の第2実施形態によるシステムは、CoMP制御装置700、複数の送信ポイントTPおよびユーザ端末であるUE800からなり、CoMP制御装置700がRRCシグナリングによりレポーティング設定候補をUEへ通知し、UEが通知された候補から適用する1つの候補を決定して送信ポイントへフィードバックする。ここでは、説明を複雑化しないために、3つの送信ポイントが設けられ、各送信ポイントの送信ポイントTPのみが図示されている。
図12において、まず、ネットワーク側のCoMP制御装置700ではレポーティング設定候補を生成する(動作901)。次に、生成されたレポーティング設定候補をRRCシグナリングで送信ポイントからUEへ通知する(動作902)。
上述した第2実施形態における第4実施例について説明する。第4実施例では、ネットワークが複数のレポーティング設定をRRCシグナリングによりUE800へ通知し、その中からUE800が適用するレポーティング設定を1つ選択し、選択されたレポーティング設定を示す識別子をフィードバックでネットワーク側へ通知する。既に述べたように、レポーティング設定は、レポーティングを行う対象の送信ポイントの組合せ(レポーティングセット)とレポーティングセットにおけるフィードバック方法との情報を含む。なお、複数のレポーティング設定を通知するRRCシグナリングについては第1実施例と同様であるから説明は省略し、図13を参照しながら、選択されたレポーティング設定をフィードバックで通知する例を説明する。
上述した第2実施形態における第5実施例について説明する。上述した第4実施例のRRCシグナリングでは、レポーティングセットおよびレポーティングセットにおけるフィードバック方法をネットワーク側へ通知するが、第5実施例では、レポーティングを行う対象の送信ポイントおよび送信ポイントにおけるフィードバック方法を通知する。さらに、第4実施例のフィードバックでは、複数の送信ポイントの組合せから構成されるレポーティング設定の1つを選択して通知していたが、第5実施例では、RRCシグナリングで通知されたそれぞれの送信ポイントごとのレポーティング設定の中で、適用するレポーティング設定の情報のみをネットワーク側へ通知する。なお、複数のレポーティング設定を通知するRRCシグナリングについては第2実施例と同様であるから説明は省略し、図14を参照しながら、選択したレポーティング設定のみの識別子を、レポーティング設定が変更になるときのみフィードバックを使って通知する例を説明する。
上述した第2実施形態における第6実施例について説明する。第6実施例では、第5実施例と同様に、レポーティングを行う対象の送信ポイントおよび送信ポイントにおけるフィードバック方法をRRCシグナリングで通知するが、フィードバック方法が第5実施例と異なる。第5実施例では、RRCシグナリングで通知されたそれぞれの送信ポイントごとのレポーティング設定の中で、適用するレポーティング設定の情報のみを通知したが、第6実施例では複数のレポーティング設定それぞれに対してレポーティング設定として適用するかどうかの識別子を通知する。なお、複数のレポーティング設定を通知するRRCシグナリングについては第3実施例と同様であるから説明は省略し、図15を参照しながら、複数のレポーティング設定それぞれに対してレポーティング設定として適用するかどうかの識別子をレポーティング設定が変更になるときのみフィードバックで通知する例を説明する。
図2に示す第1実施形態ではCoMP制御装置300と各送信ポイントTPとが独立している場合を説明したが、本発明はこれに限定されるものではなく、各送信ポイントTPにCoMP制御装置300と同等の機能を設け、送信ポイントTPが互いに接続されて通信可能な構成であってもよい。以下、図16を参照しながら、本発明の第3実施形態による送信ポイントTPについて説明するが、第1実施形態と同等の機能ブロックについては同一の参照番号を付して説明を省略する。
本発明による無線通信システムは、上述した第1実施形態と第2実施形態が混在するシステムであってもよい。たとえば、第1実施形態と第2実施形態をシステム内のUEごとに切り替えてもよい。この場合、ネットワークはそれぞれのUEにRRCシグナリングを用いて、第1実施形態または第2実施形態を示す識別子を通知する。UEは、RRCシグナリングの内容により、第1実施形態で動作するか、第2実施形態で動作するかを認識する。
202.1-202.3 L1/L2シグナリング生成部
203.1-203.3 無線部
300 CoMP制御装置
301 レポーティング設定候補生成部
302 レポーティング設定部
303 フィードバック方法決定部
304 レポーティングセット決定部
400 ユーザ端末(UE)
401 無線部
402 CSI測定部
403 フィードバック生成部
601.1-601.3 RRCシグナリング生成部
602.1-602.3 無線部
700 CoMP制御装置
701 レポーティング設定候補生成部
800 ユーザ端末(UE)
801 無線部
802 CSI測定部
803 レポーティング設定部
804 フィードバック方法決定部
805 レポーティングセット決定部
806 フィードバック生成部
1000 CoMP制御装置
1001 レポーティング設定候補生成部
1002 レポーティング設定部
1003 フィードバック方法決定部
1004 レポーティングセット決定部
1005 ポイント間通信部
Claims (35)
- ネットワークを構成する複数の送信局が協調して送信する協調送信方式の無線通信システムにおいて、
前記ネットワークが、チャネル状態情報に関する複数のレポーティング設定情報を前記協調送信方式の対象となる受信局へ通知し、
前記送信局および前記受信局が、前記複数のレポーティング設定情報のうち適用するレポーティング設定情報を共有する、
ことを特徴とする無線通信システム。 - 前記複数のレポーティング設定情報の各々は少なくとも1つの送信局をレポーティング対象として含む送信局の異なる組合せを特定する情報を少なくとも含むことを特徴とする請求項1に記載の無線通信システム。
- 前記複数のレポーティング設定情報の各々は、前記送信局の異なる組合せに対応した、前記受信局から前記ネットワークへのフィードバック方法を特定する情報を更に含むことを特徴とする請求項1または2に記載の無線通信システム。
- 複数の協調送信方式が存在し、前記複数のレポーティング設定情報の各々は前記複数の協調送信方式にそれぞれ対応することを特徴とする請求項1-3のいずれか1項に記載の無線通信システム。
- 前記送信局および前記受信局が前記適用するレポーティング設定情報を動的に共有することを特徴とする請求項1-4のいずれか1項に記載の無線通信システム。
- 前記適用するレポーティング設定情報の更新間隔が前記複数のレポーティング設定情報の通知間隔より短いことを特徴とする請求項1-5のいずれか1項に記載の無線通信システム。
- 前記適用するレポーティング設定情報は、レポーティング設定の変更を行う時にのみ、前記送信局と前記受信局との間で通知されることを特徴とする請求項1-6のいずれか1項に記載の無線通信システム。
- 前記適用するレポーティング設定情報は、制御信号を送信する時に常に前記送信局と前記受信局との間で通知されることを特徴とする請求項1-6のいずれか1項に記載の無線通信システム。
- 前記送信局が前記適用するレポーティング設定情報を前記受信局へ通知することを特徴とする請求項1-8のいずれか1項に記載の無線通信システム。
- 前記受信局が前記適用するレポーティング設定情報を前記送信局へ通知することを特徴とする請求項1-8のいずれか1項に記載の無線通信システム。
- 前記協調送信方式は、Joint Transmission(JT)、Dynamic Point Selection(DPS)、Coordinated Scheduling(CS)またはCoordinated Beamforming(CB)のいずれかであることを特徴とする請求項1-11のいずれか1項に記載の無線通信システム。
- 前記チャネル状態情報は、チャネル品質に関する情報(Channel Quality Indicator: CQI)、チャネルの共分散行列に関する情報(Channel co-variance information)、プリコーディングの行列に関する情報(Precoding Matrix indicator: PMI)、送信ランクに関する情報(Rank Indicator: RI) 、送信ポイント間の位相差に関する情報(Inter transmission point phase difference)の少なくとも1つを含むことを特徴とする請求項1-11のいずれか1項に記載の無線通信システム。
- ネットワークを構成する複数の送信局が協調して送信する協調送信方式の無線通信システムにおける協調送信方式の対象となる移動局であって、
前記ネットワークからチャネル状態情報に関する複数のレポーティング設定情報を受信する受信手段と、
前記送信局との間で、前記複数のレポーティング設定情報のうち適用するレポーティング設定情報を共有する制御手段と、
を有することを特徴とする移動局。 - 前記複数のレポーティング設定情報の各々は少なくとも1つの送信局をレポーティング対象として含む送信局の異なる組合せを特定する情報を少なくとも含むことを特徴とする請求項13に記載の移動局。
- 前記複数のレポーティング設定情報の各々は、前記送信局の異なる組合せに対応した、前記ネットワークへのフィードバック方法を特定する情報を更に含むことを特徴とする請求項13または14に記載の移動局。
- 前記無線通信システムに複数の協調送信方式が存在し、前記複数のレポーティング設定情報の各々は前記複数の協調送信方式にそれぞれ対応することを特徴とする請求項13-15のいずれか1項に記載の移動局。
- 前記送信局との間で前記適用するレポーティング設定情報を動的に共有することを特徴とする請求項13-16のいずれか1項に記載の移動局。
- 前記適用するレポーティング設定情報の更新間隔が前記複数のレポーティング設定情報の通知間隔より短いことを特徴とする請求項13-17のいずれか1項に記載の移動局。
- 前記適用するレポーティング設定情報は、レポーティング設定の変更を行う時にのみ、前記送信局との間で通知されることを特徴とする請求項13-18のいずれか1項に記載の移動局。
- 前記適用するレポーティング設定情報は、制御信号を送信する時に常に前記送信局との間で通知されることを特徴とする請求項13-18のいずれか1項に記載の移動局。
- 前記送信局から前記適用するレポーティング設定情報を受信することを特徴とする請求項13-20のいずれか1項に記載の移動局。
- 前記適用するレポーティング設定情報を前記送信局へ通知することを特徴とする請求項13-20のいずれか1項に記載の移動局。
- 前記協調送信方式は、Joint Transmission(JT)、Dynamic Point Selection(DPS)、Coordinated Scheduling(CS)またはCoordinated Beamforming(CB)のいずれかであることを特徴とする請求項13-22のいずれか1項に記載の移動局。
- 前記チャネル状態情報は、チャネル品質に関する情報(Channel Quality Indicator: CQI)、チャネルの共分散行列に関する情報(Channel co-variance information)、プリコーディングの行列に関する情報(Precoding Matrix indicator: PMI)、送信ランクに関する情報(Rank Indicator: RI) 、送信ポイント間の位相差に関する情報(Inter transmission point phase difference)の少なくとも1つを含むことを特徴とする請求項13-23のいずれか1項に記載の移動局。
- ネットワークを構成する他の無線基地局と協調して移動局に送信する協調送信方式の無線通信システムにおける無線基地局であって、
前記協調送信方式の対象となる移動局と無線通信を行う送受信手段と、
チャネル状態情報に関する複数のレポーティング設定情報を前記移動局へ通知し、前記移動局との間で前記複数のレポーティング設定情報のうち適用するレポーティング設定情報を共有する制御手段と、
を有することを特徴とする無線基地局。 - ネットワークを構成する複数の送信局が協調して送信する協調送信方式の無線通信システムにおけるレポーティング設定制御方法であって、
前記ネットワークが、チャネル状態情報に関する複数のレポーティング設定情報を前記協調送信方式の対象となる受信局へ通知し、
前記送信局および前記受信局が前記複数のレポーティング設定情報のうち適用するレポーティング設定情報を共有する、
ことを特徴とするレポーティング設定制御方法。 - 前記複数のレポーティング設定情報の各々は少なくとも1つの送信局をレポーティング対象として含む送信局の異なる組合せを特定する情報を少なくとも含むことを特徴とする請求項26に記載のレポーティング設定制御方法。
- 前記複数のレポーティング設定情報の各々は、前記送信局の異なる組合せに対応した、前記受信局から前記ネットワークへのフィードバック方法を特定する情報を更に含むことを特徴とする請求項26または27に記載のレポーティング設定制御方法。
- 前記無線通信システムに複数の協調送信方式が存在し、前記複数のレポーティング設定情報の各々は前記複数の協調送信方式にそれぞれ対応することを特徴とする請求項26-28のいずれか1項に記載のレポーティング設定制御方法。
- 前記送信局および前記受信局が前記適用するレポーティング設定情報を動的に共有することを特徴とする請求項26-29のいずれか1項に記載のレポーティング設定制御方法。
- 前記適用するレポーティング設定情報の更新間隔が前記複数のレポーティング設定情報の通知間隔より短いことを特徴とする請求項26-30のいずれか1項に記載のレポーティング設定制御方法。
- 前記適用するレポーティング設定情報は、レポーティング設定の変更を行う時にのみ、前記送信局と前記受信局との間で通知されることを特徴とする請求項26-31のいずれか1項に記載のレポーティング設定制御方法。
- 前記適用するレポーティング設定情報は、制御信号を送信する時に常に前記送信局と前記受信局との間で通知されることを特徴とする請求項26-31のいずれか1項に記載のレポーティング設定制御方法。
- 前記送信局が前記適用するレポーティング設定情報を前記受信局へ通知することを特徴とする請求項26-33のいずれか1項に記載のレポーティング設定制御方法。
- 前記受信局が前記適用するレポーティング設定情報を前記送信局へ通知することを特徴とする請求項26-33のいずれか1項に記載のレポーティング設定制御方法。
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| US14/375,092 US20150003362A1 (en) | 2012-01-30 | 2013-01-24 | Wireless communication system and method for controlling reporting settings |
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| HK1202016A1 (en) | 2015-09-11 |
| JP2016105625A (ja) | 2016-06-09 |
| TR201816019T4 (tr) | 2018-11-21 |
| JP5874742B2 (ja) | 2016-03-02 |
| CN109379114B (zh) | 2022-03-01 |
| CN104106282A (zh) | 2014-10-15 |
| JP2018042251A (ja) | 2018-03-15 |
| CN104106282B (zh) | 2018-11-30 |
| EP3176956A1 (en) | 2017-06-07 |
| JP6222494B2 (ja) | 2017-11-01 |
| JPWO2013114832A1 (ja) | 2015-05-11 |
| CN109379114A (zh) | 2019-02-22 |
| JP6465187B2 (ja) | 2019-02-06 |
| EP3413474B1 (en) | 2024-07-17 |
| EP3413474A1 (en) | 2018-12-12 |
| EP2811777A1 (en) | 2014-12-10 |
| EP2811777B1 (en) | 2017-03-15 |
| US20150003362A1 (en) | 2015-01-01 |
| ES2700440T3 (es) | 2019-02-15 |
| EP3176956B1 (en) | 2018-08-29 |
| EP2811777A4 (en) | 2015-09-16 |
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