WO2013023522A1 - Procédé de retour d'information de l'état de canal non périodique et dispositif associé - Google Patents

Procédé de retour d'information de l'état de canal non périodique et dispositif associé Download PDF

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Publication number
WO2013023522A1
WO2013023522A1 PCT/CN2012/079272 CN2012079272W WO2013023522A1 WO 2013023522 A1 WO2013023522 A1 WO 2013023522A1 CN 2012079272 W CN2012079272 W CN 2012079272W WO 2013023522 A1 WO2013023522 A1 WO 2013023522A1
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Prior art keywords
subframe
user equipment
measurement set
measurement
network side
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PCT/CN2012/079272
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English (en)
Chinese (zh)
Inventor
陈文洪
高秋彬
彭莹
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电信科学技术研究院
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Publication of WO2013023522A1 publication Critical patent/WO2013023522A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0023—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the signalling
    • H04L1/0027—Scheduling of signalling, e.g. occurrence thereof
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0023—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the signalling
    • H04L1/0026—Transmission of channel quality indication

Definitions

  • the invention relates to a method and a device for feeding back a non-periodic CSI.
  • the application is filed on August 18, 2011, the Chinese Patent Office, the application number is 201110237188.8, the Chinese patent application entitled "A non-periodic CSI feedback method and device" Priority is hereby incorporated by reference in its entirety.
  • the present invention relates to the field of communications technologies, and in particular, to a feedback method and device for aperiodic CSI. Background technique
  • CoMP Coordinated Multipoint Transmission/Reception
  • multiple transmission points are base stations of different cells, or multiple RRHs (Radio Radio Heads) controlled by the same cell base station.
  • RRHs Radio Radio Heads
  • the current downlink multi-point coordinated transmission technology solutions are mainly divided into: cooperative scheduling/beam forming (CS/CB, cooperative scheduling/beam forming) and joint processing (Joint processing).
  • Co-scheduling is to avoid or reduce interference between each other through the coordination of time, frequency and space resources between transmission points.
  • Inter-cell interference is the main factor that restricts the performance of cell edge UE (User Equipment).
  • Cooperative scheduling can improve the performance of cell edge UEs by reducing interference between cells. As shown in FIG. 1 , through coordinated scheduling of three transmission points, three UEs that may interfere with each other are scheduled to mutually orthogonal resources, thereby effectively avoiding interference between transmission points.
  • cooperative beamforming advances through the shaping direction of multiple users in a coordinated cell.
  • Row scheduling enables the beam directions of users of different cells to be orthogonal to each other, thereby reducing mutual interference.
  • cooperative beamforming is mainly implemented by interference suppression processing at the transmitting end. Therefore, in order to suppress interference of the transmission of the user to other users, the downlink channel information of the coordinated cell needs to be obtained on the base station side.
  • the joint processing scheme includes dynamic transmission point switching and joint transmission.
  • dynamic transmission point switching the base station can dynamically switch to the transmission point of the user to send a signal, so that the optimal transmission point is transmitted every time.
  • the base station needs to obtain multiple optional cells through the feedback channel. Channel information, or channel information for obtaining the optimal transmission point.
  • multiple transmission points simultaneously transmit data to the UE to enhance the UE receiving signals.
  • three transmission points send data to one UE on the same resource.
  • the UE simultaneously receives signals of multiple cells.
  • the superposition of useful signals from multiple cells can improve the signal quality received by the UE, and on the other hand, reduce the interference experienced by the UE, thereby improving system performance.
  • Such a scheme requires the UE to feed back channel information of multiple cells, and even relatively channel information between cells, thereby ensuring that multiple cells can jointly perform scheduling, precoding, and data transmission.
  • the UE estimates the channel information of the base station to the UE according to the CSI-RS (Channel State Information Reference Signal) configured by the base station, and calculates the CQI ( Channel
  • Quality Indicator, channel quality indicator) feedback to the base station, and CQI - the same feedback may also have an index of PMI (Precoding Matrix Indicator)
  • RI Rank Indication, the number of data streams.
  • the base station can trigger the UE to perform aperiodic CSI (Channel State Information by using Downlink Control Information). Reporting of the channel state information); after receiving the triggering command, the UE feeds back the downlink RI/PMI/CQL according to a specific feedback mode through the PUSCH (Physical Uplink Shared Channel)
  • PUSCH Physical Uplink Shared Channel
  • the UE may be configured with a measurement set by using the high layer signaling, where the measurement set may include measurement information of multiple transmission points, that is, information of downlink reference signals corresponding to each transmission point, UE After receiving, the measurement and feedback of the downlink channel information are performed on the reference signal in the measurement set.
  • elCIC Inter-cell interference coordination
  • elCIC Inter-cell interference coordination
  • the subframe is configured as an ABS (Almost blank subframe)
  • the macro base station does not A PDCCH (Physical Downlink Control Channel) and a Physical Downlink Shared Channel (PDSCH) are transmitted to suppress interference with the RRH. Therefore, the transmission points that cooperate in the two subframes are different, and the transmission points that need to be measured are also different.
  • PDCCH Physical Downlink Control Channel
  • PDSCH Physical Downlink Shared Channel
  • the base station may notify the UE of two different subframe sets through high layer signaling, and the UE performs CSI measurement and feedback separately for two different subframe sets.
  • the base station may use the ABS subframe and the non-ABS subframe as the two subframe sets, and notify the UE by using the high layer signaling to ensure that the UE can separately measure the two seed frames; the base station may also use the other for the base station.
  • the UE is notified of different scenarios or multiple subframe sets with different interference conditions.
  • Embodiments of the present invention provide a feedback method and device for aperiodic CSI to implement feedback for a subframe within a subframe set.
  • an embodiment of the present invention provides aperiodic channel state information.
  • CSI feedback methods including:
  • the user equipment receives measurement set configuration information from the network side device
  • the user equipment receives an aperiodic CSI feedback trigger indication from the network side device
  • the user equipment performs feedback of the aperiodic CSI for the measurement set corresponding to the subframe that receives the trigger indication.
  • the embodiment of the invention provides a feedback method for aperiodic channel state information CSI, including:
  • the network side device sends the measurement set configuration information to the user equipment
  • the network side device sends an aperiodic CSI feedback triggering indication to the user equipment, to instruct the user equipment to perform aperiodic CSI feedback on the measurement set corresponding to the subframe that receives the trigger indication.
  • An embodiment of the present invention provides a user equipment, including:
  • a receiving module configured to receive measurement set configuration information from a network side device, and receive an aperiodic CSI feedback trigger indication from the network side device;
  • a processing module configured to perform aperiodic CSI feedback on the measurement set corresponding to the subframe that receives the trigger indication.
  • the embodiment of the invention provides a network side device, including:
  • a first sending module configured to send measurement set configuration information to the user equipment;
  • a second sending module configured to send an aperiodic CSI feedback triggering indication to the user equipment, to instruct the user equipment to perform aperiodic CSI feedback on the measurement set corresponding to the subframe that receives the trigger indication.
  • the embodiment of the invention has at least the following advantages:
  • the measurement and feedback for the subframes in the subframe set can be implemented, so that the problem that different subframe sets need to be measured in different subframe sets can be solved in the case of using CoMP and elCIC at the same time; and how to solve the problem in the case of aperiodic CSI feedback A problem indicating feedback for different sets of measurements is indicated; and no additional signaling overhead is required to indicate which measurement set the UE is feeding back to.
  • FIG. 1 and FIG. 2 are schematic diagrams of networking of a downlink multi-point coordinated transmission technology in the prior art
  • FIG. 3 is a flow chart of a feedback method for aperiodic CSI according to Embodiment 1 of the present invention
  • FIG. 4 is a schematic structural diagram of a user equipment according to Embodiment 4 of the present invention
  • FIG. 5 is a schematic structural diagram of a network side device according to Embodiment 5 of the present invention.
  • the inventor notices that, in the case of a CoMP scenario, when the UE performs aperiodic CSI feedback, it needs to feed back channel state information of multiple transmission points, and the base station notifies the measurement point information to be measured through the measurement set.
  • UE If the elCIC is configured at this time, the interference received by the UE in the ABS subframe and the non-ABS subframe is different.
  • the transmission points for the collaboration are also different, and different measurement sets need to be configured for different subframe types.
  • the UE when the UE is triggered to perform aperiodic CSI feedback, since there are measurement sets for different subframe types, the UE needs to know which information of the measurement set is used for feedback.
  • the embodiment of the present invention provides a method and a device for feeding back a non-periodic CSI, and the UE performs feedback on the aperiodic CSI based on the measurement set, and the UE learns that the feedback is based on the measurement set corresponding to the subframe that triggers the aperiodic CSI feedback.
  • the measurement information is collected to perform aperiodic CSI feedback.
  • the embodiment of the present invention provides a method for feeding back a non-periodic CSI.
  • the UE may learn the measurement set information for the feedback according to the measurement set corresponding to the subframe that triggers the aperiodic CSI feedback, thereby performing aperiodic CSI feedback.
  • the method includes the following steps:
  • Step 301 A network side device (such as a base station) sends measurement set configuration information to the UE.
  • the measurement set is a set of measurement information of one or more transmission points.
  • the measurement information of the transmission point is generally information of a downlink reference signal corresponding to the transmission point, for example, a downlink CSI-RS corresponding to the transmission point.
  • Configuration information or configuration information index For the sending process, the UE may receive measurement set configuration information from the network side device.
  • the network side device sends the measurement set configuration information to the UE.
  • the method includes: but is not limited to: the network side device sends the measurement set configuration information to the UE by using the high layer signaling; the high layer signaling includes but is not limited to: MAC (Media Access Control) signaling, RRC (Radio Resource Control, Radio resource control) signaling, etc. Therefore, for the sending process, the UE receives the measurement set configuration information from the network side device, where the UE includes: the UE receives the measurement set configuration information from the network side device by using the high layer signaling.
  • the network side device may further send the subframe set configuration information to the UE, where the subframe set configuration information has a corresponding relationship with the measurement set configuration information.
  • the UE may receive subframe set configuration information from the network side device.
  • the network side device may send the subframe set configuration information to the UE by using the high layer signaling; and the UE may receive the subframe set configuration information from the network side device by using the high layer signaling.
  • the network side device may send the subframe set configuration information and the measurement set configuration information to the UE by using the same signaling, or may separately send the subframe set configuration information and the measurement set configuration information by using different signaling. Give the UE.
  • the foregoing subframe set and the foregoing measurement set have a corresponding relationship, and different subframe sets may correspond to the same or different measurement sets.
  • the determining manner of the subframe set includes, but is not limited to, the network side device is configured according to actual needs. For example, the network side device configures the subframes 0, 3, and 4 as one subframe set, and configures the subframe. 1 , 2, 5 is configured as another subframe set; or, the network side device determines the subframe set based on the subframe type, for example, the network side device configures the ABS subframe into one subframe set, and configures the non-ABS subframe. For another sub-frame collection.
  • Step 302 The network side device sends an aperiodic CSI feedback triggering indication (ie, trigger signaling) to the UE, and instructs the UE to perform aperiodic CSI feedback on the measurement set corresponding to the subframe that receives the trigger indication.
  • aperiodic CSI feedback triggering indication ie, trigger signaling
  • the user equipment is instructed to perform the aperiodic CSI feedback on the measurement set corresponding to the subframe that receives the trigger indication, and includes: indicating, by the UE, the measurement corresponding to the subframe set in which the subframe in which the trigger indication is received The aggregation performs the feedback of the aperiodic CSI; or, the UE is instructed to perform the feedback of the aperiodic CSI after obtaining the measurement set according to the preset mapping relationship between the subframe that receives the trigger indication and the measurement set.
  • the mapping relationship between the subframe and the measurement set may be pre-arranged, for example, the index of the measurement set and the subframe number may have a corresponding relationship, for example, the odd subframe corresponds to one measurement set, the even subframe corresponds to one measurement set, or Each subframe corresponds to one measurement set.
  • the correspondence between the trigger subframe and the measurement set is independent, and the correspondence between the subframe set and the measurement set is independent.
  • the obtaining manner of the aperiodic CSI includes: measuring the aperiodic CSI on a subframe in a subframe set corresponding to the measurement set.
  • the corresponding relationship is the correspondence between the subframe set and the measurement set in the foregoing step 301.
  • Step 303 The UE receives an aperiodic CSI feedback triggering indication from the network side device, where the triggering indication is used to indicate that the UE performs aperiodic CSI feedback for the measurement set corresponding to the subframe that receives the trigger indication. Based on the sending process of the trigger indication in step 302 above, the UE may receive an aperiodic CSI feedback trigger indication from the network side device.
  • Step 304 After receiving the aperiodic CSI feedback triggering indication from the network side device, the UE performs aperiodic CSI feedback on the measurement set corresponding to the subframe in which the triggering indication is received, that is, the UE feeds back the measurement result to the network side device.
  • the UE performs the feedback of the aperiodic CSI for the measurement set corresponding to the subframe that receives the trigger indication, and includes: the subframe where the UE is located for the subframe that receives the trigger indication.
  • the measurement set corresponding to the set performs feedback of the aperiodic CSI; or the UE obtains the feedback of the aperiodic CSI after obtaining the measurement set according to the preset mapping relationship between the subframe and the measurement set that receives the trigger indication.
  • the obtaining manner of the aperiodic CSI includes: measuring the aperiodic CSI on a subframe in a subframe set corresponding to the measurement set.
  • the corresponding relationship is the correspondence between the subframe set and the measurement set in the foregoing step 301.
  • Step 305 The network side device receives the measurement result of the aperiodic CSI fed back by the UE. It should be noted that, in the embodiment of the present invention, if one subframe belongs to multiple subframe sets at the same time, CSI measurement and feedback may be performed for measurement sets corresponding to multiple subframe sets at the same time; or according to a manner agreed in advance with the network side device. Measurement and feedback are only performed for the measurement set corresponding to one of the subframe sets.
  • the aperiodic CSI is fed back based on the subframe set, and the UE obtains the measurement set information for the feedback according to the subframe set in which the subframe that triggers the aperiodic CSI feedback is obtained, thereby performing the measurement set information.
  • Aperiodic CSI feedback Therefore, measurement and feedback for the subframes in the subframe set can be implemented, so that the problem that different subframe sets need to be measured in different subframe sets can be solved in the case of using CoMP and elCIC at the same time; and can be solved in the case of aperiodic CSI feedback. How to indicate the problem of feedback for different measurement sets; and no additional signaling overhead is required to indicate which measurement set the UE is feeding back to.
  • the second embodiment of the present invention provides a method for feeding back a non-periodic CSI.
  • the UE is configured to configure six downlink subframes in one radio frame, and notify the UE of the subframes 0, 3, and 4 through high layer signaling. It is a measurement subframe set 1, and subframes 1, 2, and 5 are measurement subframe sets 2.
  • the base station first needs to configure the measurement set to the UE, the measurement set and the above measurement
  • the frame set has a corresponding relationship, such as a measurement subframe set 1 composed of subframes 0, 3, 4, and the corresponding measurement set 1 includes measurement information of the transmission point 0, 1; and the measurement component composed of the subframe 1, 2, 5 Frame set 2, the corresponding measurement set 2 contains measurement information of transmission points 0, 1, and 2.
  • the aperiodic feedback of the UE is triggered in the subframe 0 or 3 or 4 to implicitly indicate that the UE feedback is in the measurement subframe set 1 for measurement.
  • Set 1 performs CSI measurement CSI; or, the base station triggers aperiodic feedback of the UE in subframe 1 or 2 or 5 to implicitly instruct the UE to feed back CSI measured by CSI measurement for measurement set 2 in measurement subframe set 2 .
  • the UE After receiving the aperiodic CSI trigger signaling, the UE finds the subframe set in which the subframe is located and the measurement set corresponding to the subframe set according to the subframe in which the trigger signaling is located, and feeds back the measurement set.
  • the subframe set in which the subframe is located is the measurement subframe set 1 of the subframe ⁇ 0, 3, 4 ⁇ , and the corresponding measurement set is the measurement set 1;
  • the UE needs to feed back the measurement result obtained by performing CSI measurement on the measurement set 1 (that is, the measurement information based on the transmission point 0, 1) on the subframe 0 or the subframe 3 or the subframe 4.
  • the third embodiment of the present invention provides a method for feeding back a non-periodic CSI.
  • the UE is configured to configure six downlink subframes in one radio frame, and notify the UE through subframes 0, 3, and 4 through high layer signaling. It is a measurement subframe set 1, and subframes 1, 2, and 5 are measurement subframe sets 2.
  • the base station first needs to configure the measurement set to the UE, and the measurement set has a corresponding relationship with the foregoing measurement subframe set, for example, for the measurement subframe set 1 composed of subframes 0, 3, and 4, the corresponding measurement set 1 includes the transmission point 0, Measurement information of 1; for measurement subframe set 2 composed of subframes 1, 2, 5, corresponding measurement set 2 includes measurement of transmission points 0, 1, 2 Information. And the base station and the UE agree to feed back the CSI corresponding to the measurement set 1 when the odd subframe is triggered, and feed back the CSI corresponding to the measurement set 2 when the even subframe triggers.
  • the base station After the base station notifies the measurement set corresponding to the two subframe sets to the UE by using the high layer signaling, the base station triggers the aperiodic feedback of the UE in the parity subframe to obtain the CSI corresponding to the different measurement sets. After receiving the aperiodic CSI trigger signaling, the UE finds the corresponding measurement set according to the pre-agreed mapping relationship according to the subframe in which the trigger signaling is located, and performs CSI feedback for the measurement set.
  • the UE receives the trigger information of the aperiodic CSI feedback in the subframe 1, the corresponding measurement set is the measurement set 1, and the subframe set corresponding to the measurement set 1 is the measurement subframe set 1.
  • the UE needs to feed back the measurement result obtained by performing CSI measurement on the measurement set 1 (that is, the measurement information based on the transmission point 0, 1) in the measurement subframe set 1 .
  • the embodiment of the present invention further provides a user equipment.
  • the device includes:
  • the receiving module 11 is configured to receive measurement set configuration information from the network side device, and receive an aperiodic CSI feedback trigger indication from the network side device;
  • the processing module 12 is configured to perform feedback of the aperiodic CSI for the measurement set corresponding to the subframe that receives the trigger indication.
  • the receiving module 11 is specifically configured to receive measurement set configuration information from the network side device by using high layer signaling.
  • the receiving module 11 is further configured to receive subframe set configuration information from the network side device, where the subframe set configuration information has a corresponding relationship with the measurement set configuration information.
  • the processing module 12 is specifically configured to perform aperiodic CSI feedback on the measurement set corresponding to the subframe set in which the subframe in which the trigger indication is received.
  • the processing module 12 is specifically configured to: according to a preset mapping relationship between the subframe that receives the trigger indication and the measurement set, obtain feedback of the aperiodic CSI after obtaining the measurement set.
  • the processing module 12 is further configured to measure the aperiodic CSI on a subframe in a subframe set corresponding to the measurement set.
  • the measurement set is a set of measurement information of one or more transmission points.
  • the subframe set is determined by: determining a subframe set based on the subframe type.
  • modules of the device of the present invention may be integrated or integrated.
  • the above modules can be combined into one module, or can be further split into multiple sub-modules.
  • the embodiment of the present invention further provides a network side device.
  • the device includes:
  • the first sending module 21 is configured to send the measurement set configuration information to the user equipment
  • the second sending module 22 is configured to send an aperiodic CSI feedback triggering indication to the user equipment, to indicate that the user equipment is configured to receive the trigger.
  • the measurement set corresponding to the indicated subframe performs feedback of aperiodic CSI.
  • the first sending module 21 is specifically configured to send the measurement set configuration information to the user equipment by using high layer signaling.
  • the first sending module 21 is further configured to send the subframe set configuration information to the user equipment, where the subframe set configuration information has a corresponding relationship with the measurement set configuration information.
  • the second sending module 22 is specifically configured to instruct the user equipment to receive the trigger indication, when the user equipment is instructed to perform the aperiodic CSI feedback on the measurement set corresponding to the subframe that receives the trigger indication.
  • the set of subframes in which the sub-frame is located The set of measurements should be fed back with a non-periodic CSI.
  • the second sending module 22 is specifically configured to instruct the user equipment to receive the preset according to the preset And triggering a mapping relationship between the subframe of the indication and the measurement set, and obtaining feedback of the aperiodic CSI after obtaining the measurement set.
  • the second sending module 22 is further configured to indicate that the aperiodic CSI is measured on a subframe in a subframe set corresponding to the measurement set.
  • the measurement set is a set of measurement information of one or more transmission points.
  • the subframe set is determined by: determining a subframe set based on the subframe type.
  • modules of the device of the present invention may be integrated or integrated.
  • the above modules can be combined into one module, or can be further split into multiple sub-modules.
  • modules in the apparatus in the embodiments may be distributed in the apparatus of the embodiment according to the description of the embodiments, or the corresponding changes may be located in one or more apparatuses different from the embodiment.
  • the modules of the above embodiments may be combined into one module, or may be further split into multiple sub-modules.
  • the serial numbers of the embodiments of the present invention are merely for the description, and do not represent the advantages and disadvantages of the embodiments.
  • the above disclosure is only a few specific embodiments of the present invention, but the present invention is not limited thereto, and any changes that can be considered by those skilled in the art should fall within the protection scope of the present invention.

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

Abstract

La présente invention concerne un procédé de retour d'information de l'état de canal (CSI) non périodique et un dispositif associé, tel que : un équipement utilisateur reçoit des informations de configuration d'ensemble de mesures depuis un équipement du côté du réseau ; ledit équipement utilisateur reçoit une instruction de déclenchement de retour CSI non périodique émise par l'équipement du côté du réseau ; ledit équipement utilisateur effectue un retour CSI non périodique sur l'ensemble de mesures correspondant à la sous-trame qui reçoit ladite instruction de déclenchement. Les modes de réalisation de la présente invention permettent la mesure et le retour de sous-trame dans l'ensemble de sous-trames, résolvant ainsi le problème posé lorsque différents ensembles de sous-trames requièrent différents points de transmission tout en utilisant simultanément la transmission/réception multipoint coordonnée (CoMP) et la coordination d'interférence inter-cellule améliorée (eICIC).
PCT/CN2012/079272 2011-08-18 2012-07-27 Procédé de retour d'information de l'état de canal non périodique et dispositif associé WO2013023522A1 (fr)

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CN201110237188.8A CN102291224B (zh) 2011-08-18 2011-08-18 一种非周期csi的反馈方法和设备

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