WO2013107259A1 - Procédé et dispositif de transmission d'informations de largeur de bande - Google Patents

Procédé et dispositif de transmission d'informations de largeur de bande Download PDF

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Publication number
WO2013107259A1
WO2013107259A1 PCT/CN2012/087570 CN2012087570W WO2013107259A1 WO 2013107259 A1 WO2013107259 A1 WO 2013107259A1 CN 2012087570 W CN2012087570 W CN 2012087570W WO 2013107259 A1 WO2013107259 A1 WO 2013107259A1
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WIPO (PCT)
Prior art keywords
reference signal
transmission bandwidth
bandwidth
base station
indication information
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PCT/CN2012/087570
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English (en)
Chinese (zh)
Inventor
陈文洪
高秋彬
彭莹
张然然
倪浩
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电信科学技术研究院
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Publication of WO2013107259A1 publication Critical patent/WO2013107259A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • H04W72/044—Wireless resource allocation based on the type of the allocated resource
    • H04W72/0453—Resources in frequency domain, e.g. a carrier in FDMA
    • 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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W28/00—Network traffic management; Network resource management
    • H04W28/16—Central resource management; Negotiation of resources or communication parameters, e.g. negotiating bandwidth or QoS [Quality of Service]
    • H04W28/18—Negotiating wireless communication parameters
    • H04W28/20—Negotiating bandwidth

Definitions

  • the present invention relates to the field of communications, and in particular, to a method and apparatus for transmitting bandwidth information. Background technique
  • CoMP Coordinated Multipoint Transmission/Reception
  • the system to which this technology is applied is called a CoMP system.
  • CoMP technology refers to the collaboration between multiple transmission points that are geographically separated.
  • multiple transmission points are base stations of different cells, or multiple mobile radio units (RRHs) controlled by the same cell base station.
  • RRHs mobile radio units
  • the downlink multi-point coordinated transmission technology scheme is mainly divided into two categories: cooperative scheduling/beam forming (CS/CB, cooperative scheduling/beam forming) and joint processing (Joint processing).
  • Co-scheduling is to avoid or reduce the interference between each other through the coordination of time, frequency and space resources between transmission points.
  • the small interval interference is the main factor that restricts the performance of the cell edge UE. Therefore, cooperative scheduling can improve the performance of the cell edge UE by reducing the interference between cells.
  • FIG. 1 through coordinated scheduling of three transmission points, three UEs that may be mutually interfered are scheduled to mutually orthogonal resources (representing different resources by different lines), effectively avoiding transmission points. The interference between.
  • the cooperative beam formability schedules the shaping directions of multiple users in the coordinated cell, so that the beam directions of different cell users are orthogonal to each other, thereby reducing the mutual interference.
  • MU-MIMO Multiple Users-Multiple Input Multiple Output
  • cooperative beamforming is mainly implemented by the interference suppression processing at the transmitting end. Therefore, in order to suppress the interference of the transmission of the user to other users, the downlink channel information of the coordinated cell needs to be obtained at the base station.
  • the joint processing scheme includes dynamic transmission point switching and joint transmission.
  • 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 channel information of multiple selectable transmission points by using feedback channel information, or obtain channel information of an optimal transmission point.
  • Multiple transmission points in the joint transmission scheme simultaneously send data to the UE to enhance the UE receive signal. As shown in FIG. 2, three transmission points transmit data to one UE on the same resource, and the UE simultaneously receives signals of multiple transmission points.
  • the superposition of useful signals from multiple transmission points can improve the signal shield received by the UE, and on the other hand, reduce the interference received by the UE, thereby improving system performance.
  • This scheme requires the UE to feed back channel information of multiple transmission points, and even transmit relative channel information between the points, thereby ensuring that multiple transmission points can jointly perform scheduling, precoding, and data transmission.
  • This transmission mode can be extended to the multi-user joint transmission (MU-JT) mode, that is, the multiple transmission points simultaneously transmit data to multiple UEs on the same resource, and the orthogonal demodulation reference is adopted between the multiple UEs.
  • DMRS Demodulation Reference Signal
  • the downlink system bandwidth of the handover target cell may be different from the source cell, and the user equipment (User Equipment, UE) may not obtain the correct PDSCH transmission bandwidth after the handover, thereby failing to Normally demodulate data.
  • User Equipment User Equipment
  • the base station needs to indicate different types of reference signals of the UE, and the UE performs some operations according to these reference signals to support the above different transmission modes.
  • the different reference signal types are analyzed as follows:
  • CRS Cell-specific Reference Signal
  • V2 the largest resource block in the downlink
  • DMRS Downlink Reference Signal
  • Non-zero power channel state information reference signal In order to measure channel information of multiple transmission points for CoMP, the base station needs to indicate multiple CSI-RS resources to the UE, which are respectively used for The CSI of different transmission points is measured, where the CSI-RS resource and the transmission point are corresponding to each other.
  • the bandwidth of the cells may be different, the UE cannot determine which bandwidth the CSI-RS sequence should be generated according to, and the UE may generate a CSI-RS that is inconsistent with the base station because the used bandwidth is inconsistent with the base station.
  • the sequence that caused subsequent operations could not be achieved.
  • 7Vrb is directly obtained from the downlink system bandwidth of the cell where the CSI-RS is located, and the obtained method is the prior art.
  • Zero-power CSI-RS For one UE, a transmission point (or cell) other than the transmission point (or cell) corresponding to the downlink channel that the UE needs to measure may also send a non-zero-power CSI-RS to the UE. These CSI-RSs are irritating to the UE. In some resource locations with large interferences, the base station will notify the UE of the zero-power CSI-RS, that is, the location of the corresponding CSI-RS is muting the PDSCH, and does not send the useful signal of the UE, so that the location can be avoided. False inspection. At these locations the UE can receive the signal of the victim cell and can therefore be used for the interference measurement. Since the zero-power CSI-RS is generally a non-zero-power CSI-RS for the UE, the method for generating the sequence of the non-zero-power CSI-RS for the interference region is described above.
  • the system bandwidth of multiple cells may be different, and the UE cannot determine which system bandwidth should be used as the transmission bandwidth. Moreover, if the transmission bandwidth used by the base station and the UE is inconsistent, the UE cannot correctly demodulate the downlink data, and the generated reference signal sequence is incorrect.
  • Embodiments of the present invention provide a method and apparatus for transmitting bandwidth information for implementing bandwidth information transmission in a CoMP system.
  • a method for transmitting bandwidth information, applied to a base station side includes the following steps:
  • the base station determines the transmission bandwidth for the downlink data or the reference signal that the user equipment UE needs to know the bandwidth information in the multiple cells that are coordinated by the multiple points;
  • the base station determines a sequence of physical resources and reference signals that the reference signal needs to occupy, and transmits a sequence of the reference signals on the physical resources;
  • the base station determines the physical resource occupied by the downlink data, and after transmitting the indication information of the physical resource to the UE, transmitting the downlink data on the physical resource.
  • a method for transmitting bandwidth information, applied to a UE side includes the following steps: Receiving, by the UE, indication information of a transmission bandwidth corresponding to the downlink data or the reference signal in the multiple cells that are coordinated by the base station;
  • the UE determines the physical resource occupied by the downlink data according to the transmission bandwidth indicated by the indication information, and performs data detection on the determined physical resource;
  • the UE determines the physical resource occupied by the downlink data according to the transmission bandwidth indicated by the indication information, and performs interference suppression on the determined physical resource;
  • the UE determines the sequence of the physical resource and the reference signal occupied by the downlink reference signal according to the transmission bandwidth indicated by the indication information, and performs channel estimation according to the corresponding sequence on the determined physical resource.
  • a base station comprising:
  • An interface module configured to send, to the UE, the determined indication information of the transmission bandwidth
  • the control module determines a sequence of physical resources and reference signals to be occupied by the reference signal, and transmits a sequence of the reference signals on the physical resources;
  • the control module determines the physical resource occupied by the downlink data, and after transmitting the indication information of the physical resource to the UE, transmitting the downlink data on the physical resource. .
  • a UE comprising:
  • An interface module configured to receive, by the base station, indication information of a transmission bandwidth corresponding to the downlink data or the reference signal in the multiple cells that are coordinated by the base station;
  • control module is configured to determine, according to the transmission bandwidth indicated by the indication information, the physical resource occupied by the downlink data, and perform data detection on the determined physical resource;
  • control module is configured to determine, according to the transmission bandwidth indicated by the indication information, the physical resource occupied by the downlink data, and perform interference suppression on the determined physical resource;
  • control module is configured to determine, according to the transmission bandwidth indicated by the indication information, a sequence of physical resources and reference signals occupied by the downlink reference signal, and perform channel estimation according to the corresponding sequence on the determined physical resource.
  • the base station determines the transmission bandwidth for the downlink data or the reference signal that needs to be transmitted to the UE in the multiple cells that are coordinated by multiple points, and sends the determined transmission bandwidth to the UE, so that the UE obtains the exact in the multi-point cooperation system.
  • the transmission bandwidth for the downlink data or the reference signal is consistent with the base station to implement operations such as channel measurement, interference suppression, data detection, and the like.
  • FIG. 1 is a schematic diagram of a system for cooperative scheduling in the prior art
  • 2 is a schematic diagram of a system for joint transmission in the prior art
  • 3 is a flowchart of a method for implementing bandwidth information transmission by a base station side according to an embodiment of the present invention
  • FIG. 4 is a flowchart of a method for a UE to transmit bandwidth information according to an embodiment of the present invention
  • FIG. 5 is a flowchart of a method for transmitting transmission bandwidth and interference suppression operation when performing interference suppression for CRS according to an embodiment of the present invention
  • FIG. 6 is a flowchart of a method for transmitting a CRS transmission bandwidth and performing measurement by using a CRS according to an embodiment of the present invention
  • FIG. 7 is a flowchart of a method for transmitting a transmission bandwidth of a non-zero power CSI-RS resource and performing measurement according to an embodiment of the present invention
  • FIG. 8 is a flow chart of a method for transmitting a transmission bandwidth of a zero-power CSI-RS resource and performing interference suppression according to an embodiment of the present invention
  • FIG. 9 is a flowchart of a method for transmitting a transmission bandwidth of a DMRS and performing channel estimation according to an embodiment of the present invention
  • FIG. 10 is a flowchart of a method for transmitting a transmission bandwidth of downlink data and receiving downlink data according to an embodiment of the present invention
  • FIG. 12 is a structural diagram of a UE according to an embodiment of the present invention. detailed description
  • the base station determines the transmission bandwidth for the downlink data or the reference signal that needs to be transmitted to the UE in the multiple cells that are coordinated by multiple points, and sends the determined transmission bandwidth to the UE, so that the UE obtains the exact target in the CoMP system.
  • the transmission bandwidth of the downlink data or the reference signal is consistent with the base station to implement operations such as channel measurement, interference suppression, and data reception.
  • the method for implementing bandwidth information transmission by the base station side in this embodiment is as follows:
  • Step 301 The base station determines a transmission bandwidth for the downlink data or the reference signal that the UE needs to know the bandwidth information in the multiple cells that are coordinated by the multiple points.
  • the base station uses the system bandwidth of the cell that transmits the corresponding downlink reference signal/downlink data (where the downlink reference signal/downlink data represents the downlink reference signal, or the downlink data, or the downlink reference signal and the downlink data) as the corresponding downlink reference signal/ The transmission bandwidth of the downlink data.
  • a system bandwidth is selected from the system bandwidth configuration of the multiple cells according to the user scheduling condition as the transmission bandwidth of the corresponding downlink reference signal. For example, selecting a larger or smaller system bandwidth of multiple system bandwidths of multiple cells as the final determined transmission bandwidth; or selecting a system bandwidth with the largest number of cells of the same system bandwidth as the transmission bandwidth corresponding to the corresponding downlink data transmission. .
  • a downlink DMRS may have multiple transmission cells, and a cell with the smallest system bandwidth may be selected from the system bandwidths of the multiple transmission areas as the transmission bandwidth corresponding to the corresponding downlink DMRS.
  • Step 302 The base station sends the determined indication information of the transmission bandwidth corresponding to the corresponding downlink data or the reference signal to the UE.
  • Step 303 is continued for the reference signal, and step 304 is continued for the downlink data.
  • Step 303 The base station determines, according to the transmission bandwidth determined for the reference signal, a sequence of physical resources and reference signals to be occupied by the reference signal, and transmits a sequence of the reference signals on the physical resources.
  • Step 304 The base station determines the physical resource occupied by the downlink data according to the transmission bandwidth determined for the downlink data, and sends the indication information of the physical resource to the UE, and then transmits the downlink data on the physical resource.
  • the reference signal in this embodiment includes one or more of CRS, DMRS, CSI-RS with zero power, and CSI-RS with non-zero power.
  • the base station needs the UE to learn the CRS of the bandwidth information in the multiple cells coordinated by the multi-point, and the step of determining the transmission bandwidth includes: the system bandwidth of the cell that the base station transmits the CRS that needs the UE to know the bandwidth information. Determine the transmission bandwidth corresponding to the CRS.
  • the CRS needs to be transmitted to the UE through three cells, and the UE needs to measure the CRS of the three cells. Then, the base station sends the system bandwidth of the three cells to the UE, and the UE measures the CRS corresponding to each cell in the corresponding transmission bandwidth of each cell.
  • the base station determines, for the multi-point coordinated multiple cells, the non-zero-power CSI-RS resource that needs the UE to learn the bandwidth information, and the determining the transmission bandwidth includes:
  • the system bandwidth of the cell of the CSI-RS resource that requires the UE to learn the non-zero power of the bandwidth information is determined as the transmission bandwidth corresponding to the non-zero power CSI-RS resource.
  • the base station sends the system bandwidth of the three cells to the UE, and the UE generates a corresponding sequence for the non-zero-power CSI-RS resources corresponding to the cells according to the system bandwidth of each cell.
  • the base station determines, for the multi-homed multiple cells, the zero-power CSI-RS resource that the UE obtains the bandwidth information, and the determining the transmission bandwidth includes: The system bandwidth of the interference cell of the non-zero power CSI-RS resource corresponding to the zero-power CSI-RS resource of the bandwidth information determines the transmission bandwidth corresponding to the CSI-RS resource of zero power.
  • the base station needs the UE to learn the DMRS resource of the bandwidth information
  • the step of determining the transmission bandwidth includes: performing, by the base station, the system bandwidth of the DMRS of the bandwidth information of the UE according to the transmission requirement. , Determine a transmission bandwidth for the DMRS.
  • the correspondence between the reference signal and the cell may be one-to-one, one-to-many or many-to-one. If there are multiple cells corresponding to the reference signal that the UE needs to know the bandwidth information, the base station selects one system bandwidth from the system bandwidth configurations of the multiple cells to determine the transmission bandwidth corresponding to the reference signal. For example, if three cells use the same CRS, the base station selects one system bandwidth from the system bandwidths of the three cells to determine the transmission bandwidth corresponding to the reference signal.
  • the step of determining the transmission bandwidth by the base station for downlink data that needs to be transmitted to the UE in multiple cells coordinated by multiple points The base station transmits the system bandwidth of the downlink data to the UE according to the need, and determines a transmission bandwidth for the downlink data. If there are multiple cells that need to transmit downlink data to the UE, the base station selects one system bandwidth from the system bandwidth configurations of the multiple cells to determine the transmission bandwidth corresponding to the corresponding downlink data.
  • the base station can determine the corresponding transmission bandwidth for multiple reference signals at the same time, and send the signal to the UE through one or more signalings.
  • it is required to agree with the UE to obtain a transmission rule information corresponding to the required downlink reference signal, for example, by distinguishing by identification or by transmitting bandwidth.
  • the indication information is distinguished at a specific position in the signaling, or the maximum or minimum bandwidth of the plurality of transmission bandwidths is used as the transmission bandwidth information corresponding to the target downlink reference signal.
  • the indication information of the transmission bandwidth in this embodiment has various forms, for example, the indication information of the bandwidth is the value of the bandwidth, or the indication information of the bandwidth is an index of the value of the corresponding bandwidth.
  • the base station can send indication information of the transmission bandwidth to the UE in multiple manners.
  • the step of the base station transmitting the indication information of the determined transmission bandwidth to the UE includes: sending, by the base station, the determined value of the transmission bandwidth to the UE by using the high layer signaling.
  • the indication information of the transmission bandwidth is an index of the value of the transmission bandwidth.
  • the step of the base station transmitting the indication information of the determined transmission bandwidth to the UE includes: sending, by the base station, the value of the determined transmission bandwidth to the UE by using the high layer signaling. index.
  • the correspondence between the values of all possible system bandwidths and the indexes needs to be configured in the UE in advance.
  • the method further includes the following steps: The signaling sends the corresponding relationship between the system bandwidth and the index of the multiple coordinated multi-cells to the UE; the step of the base station transmitting the determined indication information of the transmission bandwidth to the UE includes: determining, by the base station, the physical downlink control channel PDCCH signaling The index of the transmission bandwidth is sent to the UE.
  • the base station and the UE may perform operations such as channel measurement, interference suppression, and data reception.
  • the base station sends the indication information of the determined transmission bandwidth to the UE. For different applications, you can have at least one of the following:
  • Operation 1 For the reference signal, the base station determines the physical resource to be occupied by the reference signal according to the transmission bandwidth determined for the reference signal, and transmits the reference signal on the determined physical resource.
  • Operation 2 For the reference signal, the base station determines the physical resource to be occupied by the reference signal according to the transmission bandwidth determined for the reference signal, and generates a sequence of the reference signal according to the transmission bandwidth determined for the reference signal, and the physical resource to be occupied by the reference signal A sequence of transmitted reference signals is transmitted.
  • the base station obtains the corresponding downlink reference signal on the bandwidth according to the transmission bandwidth corresponding to the downlink reference signal and other configuration information (such as port, time-frequency resource, and scrambling configuration) of the downlink reference signal.
  • the physical resources and sequences occupied by the number is mainly applicable to reference signals other than DMRS.
  • Method B2 The base station obtains the information according to the transmission bandwidth corresponding to the downlink reference signal and the physical resources occupied by the downlink data transmission, and other configuration information (such as port, time-frequency resource, and scrambling configuration) of the downlink reference signal.
  • the physical resources and sequences occupied by the corresponding downlink reference signals on the bandwidth is mainly applicable to DMRS.
  • Operation 3 For the downlink data, the base station determines the physical resource to be occupied by the downlink data according to the transmission bandwidth determined for the downlink data, and sends the indication information of the physical resource to the UE, and sends the downlink data to the UE on the physical resource. Preferably, the base station notifies the UE of the determined physical resource information by using a resource indication field of a Downlink Control Indication (DSI).
  • DSI Downlink Control Indication
  • the UE needs to receive the indication information of the transmission bandwidth and apply it to multiple cells, as shown in the following embodiments.
  • the method for transmitting bandwidth information by the UE in this embodiment is as follows:
  • Step 401 The UE receives the indication information of the transmission bandwidth corresponding to the downlink data or the reference signal in the multiple cells that are coordinated by the base station and sent by the base station.
  • Step 402 For downlink data, the UE determines the physical resource occupied by the downlink data according to the transmission bandwidth indicated by the indication information, and performs data detection on the determined physical resource.
  • Step 403 The UE determines, according to the transmission bandwidth indicated by the indication information, the physical resource occupied by the downlink data, and performs the suppression on the determined physical resource.
  • Step 404 The UE determines, according to the transmission bandwidth indicated by the indication information, a sequence of physical resources and reference signals occupied by the downlink reference signal, and performs channel estimation on the determined physical resources.
  • the reference signal in this embodiment includes one or more of CRS, DMRS, CSI-RS with zero power, and CSI-RS with non-zero power.
  • the indication information of the transmission bandwidth has various forms, and the corresponding UE can obtain the indication information of the transmission bandwidth in multiple manners.
  • the step of the UE receiving the indication information of the transmission bandwidth sent by the base station includes: receiving, by the high layer signaling, the value of the transmission bandwidth sent by the base station by the UE.
  • the indication information of the transmission bandwidth is an index of the value of the transmission bandwidth.
  • the step of the UE receiving the indication information that the base station sends the determined transmission bandwidth to the UE includes: the UE receiving, by using the high layer signaling, the transmission sent by the base station to the UE. Index of the value of the bandwidth
  • the indication information of the transmission bandwidth is an index of the value of the corresponding bandwidth; before receiving the indication information of the transmission bandwidth corresponding to the downlink data or the reference signal in the multiple cells coordinated by the multi-point, the UE further includes the step The UE receives the value of the system bandwidth of the multiple coordinated multi-cells sent by the base station by using the high-level signaling; the UE receives the indication information of the transmission bandwidth corresponding to the downlink data or the reference signal of the multiple cells coordinated by the base station and sent by the base station.
  • the step includes: receiving, by the UE, an index of a value of a transmission bandwidth sent by the base station by using a Physical Downlink Control Channel (PDCCH) signaling.
  • PDCCH Physical Downlink Control Channel
  • the UE After the UE knows the transmission bandwidth, it can operate on the reference signal and the downlink data based on the transmission bandwidth in various applications.
  • the UE determines the physical resource to be occupied by the reference signal according to the transmission bandwidth determined for the reference signal.
  • the UE obtains the physical resources occupied by the downlink data according to the resource information indicated by the resource indication field in the DCI sent by the base station according to the transmission bandwidth corresponding to the downlink data indicated by the indication information.
  • the UE performs interference suppression on the determined physical resources.
  • the UE performs a PDSCH muting operation on the physical resource location of the corresponding downlink reference signal on the corresponding transmission bandwidth.
  • the UE receives the corresponding downlink reference signal according to the determined physical resource on the corresponding transmission bandwidth, and uses the corresponding downlink.
  • the reference signal is used for the interference measurement operation.
  • the UE For operation 2, for the reference signal, the UE generates a sequence of reference signals based on the transmission bandwidth determined for the reference signal. specific:
  • the UE directly obtains the sequence of the corresponding downlink reference signal on the transmission bandwidth according to the transmission bandwidth information corresponding to the corresponding downlink reference signal, and the method is mainly applicable to the reference signal outside the DMRS.
  • the UE obtains the physical resource according to the corresponding transmission bandwidth information corresponding to the downlink reference signal and the physical resource occupied by the downlink reference signal, and other configuration information (such as a port, a scrambling configuration, and the like) of the downlink reference signal.
  • the sequence of the corresponding downlink reference signal is obtained according to the transmission bandwidth corresponding to the downlink reference signal indicated by the indication information and the data resource location indication information sent by the base station. This method is mainly applicable to DMRS.
  • the UE determines the physical resource to be occupied by the downlink data according to the transmission bandwidth determined for the downlink data, and receives the downlink data on the determined physical resource.
  • the method for transmitting transmission bandwidth and interference suppression operation in the case of performing interference suppression for CRS in this embodiment is as follows:
  • the process of performing CRS related processing is as follows:
  • the base station informs the UE in advance of the CRS bandwidth information corresponding to different cells in the cooperation set by the high layer signaling. Corresponding index.
  • the UE receives and saves the bandwidth information of the CRS corresponding to each cell in the cooperation set.
  • the cooperative set refers to a set of coordinated transmission points that directly or indirectly participate in transmission to the UE.
  • Step 501 The base station determines, according to the CRS configuration information of the cell that currently transmits the PDSCH to the UE, the resource information of the CRS that needs to perform PDSCH muting, including the transmission bandwidth information of the CRS.
  • the system bandwidth of the cell that transmits the PDCSH to the UE is 10M
  • the transmission bandwidth corresponding to the CRS of the cell is also 10M, so that the bandwidth information of the CRS that needs to perform PDSCH muting is also 10M.
  • Step 502 The base station indicates, by using the PDCCH signaling, an index of the cell where the CRS of the PDSCH muting is currently required to be in the coordinated set.
  • Step 503 After receiving the index information, the UE performs the CRS bandwidth information of the different cells in the coordinated set and the CRS bandwidth information of the different cells in the coordinated set according to the current need for the PDSCH muting, and obtains the bandwidth information corresponding to the CRS that needs to perform the PDSCH muting.
  • Step 504 The base station performs the bandwidth information of the CRS of the PDSCH muting according to the determined bandwidth information, and combines the CRS port, the cell ID, and other information to determine the physical resource occupied by the CRS and the sequence of the CRS, and determine the physical resource. Send a CRS sequence.
  • Step 505 The UE obtains the physical resources occupied by the CRS on the bandwidth according to the bandwidth information corresponding to the CRS, and the other information such as the port and the cell ID of the CRS.
  • Step 506 The UE performs PDSCH muting on the physical resource location occupied by the CRS on the corresponding transmission bandwidth, so as to avoid the interference of the CRS of the current PDSCH transmission cell to the PDSCH transmission.
  • the method for transmitting the transmission bandwidth of the CRS and the method for measuring by using the CRS in the present embodiment is as follows:
  • the base station informs the UE of the CRS bandwidth information corresponding to different cells in the cooperation set by the high layer signaling in advance.
  • Step 601 The base station determines, according to the CRS configuration information of the cell that currently transmits the PDSCH to the UE or the cell that needs to be measured by the UE, the resource information of the CRS that needs to be used for demodulation or measurement, including the transmission bandwidth information of the CRS.
  • the system bandwidth of the cell is used as the transmission bandwidth corresponding to the corresponding CRS. If there are multiple cells currently requiring measurement by the UE, the bandwidth information of the CRS required for measurement should also include the system bandwidth information of the multiple cells, and each of the CRSs required for measurement needs to perform the following steps separately.
  • Step 602 The base station indicates, by using the PDCCH signaling, an index of the cell in which the CRS is currently required for demodulation or measurement in the cooperation set.
  • Step 603 After receiving the index information, the UE obtains the CRS transmission bandwidth information of different cells in the coordinated set and the CRS in the coordinated set according to the current required CRS for the demodulation or measurement, and obtains the current need for demodulation or measurement.
  • Step 604 The base station determines the physical resource occupied by the CRS and the sequence of the CRS according to the determined bandwidth information of the CRS required for demodulation or measurement, and the other information such as the port and the cell ID of the CRS, and determines the sequence.
  • the CRS sequence is sent on the physical resource.
  • Step 605 The UE obtains a sequence of physical resources and CRSs occupied by the CRS on the transmission bandwidth according to the transmission bandwidth information corresponding to the CRS, and the other information such as the port and the cell ID of the CRS.
  • Step 606 The UE performs channel estimation according to the received and locally obtained CRS sequences on the physical resources occupied by the CRS, and obtains downlink channel information, so that the channel information is used for demodulation or measurement.
  • the method for transmitting the transmission bandwidth of the non-zero power CSI-RS resource and performing measurement in this embodiment is as follows:
  • Step 701 The base station determines, as the transmission bandwidth information corresponding to the respective non-zero-power CSI-RS resources, the system bandwidth of the transmitting cells of the respective non-zero-power CSI-RS resources.
  • Step 702 The base station informs the UE of the transmission bandwidth information corresponding to each non-zero power CSI-RS resource in the measurement set by the high layer signaling.
  • the measurement set refers to a set of transmission points that the UE needs to perform downlink channel information measurement.
  • Step 703 The UE receives, by using the high layer signaling, transmission bandwidth information (value) corresponding to each non-zero power CSI-RS resource in the measurement set.
  • Step 704 The base station obtains the physics occupied by each CSI-RS resource according to the bandwidth information corresponding to each non-zero-power CSI-RS resource in the measurement set, and the other information such as the port of the CSI-RS resource and the time-frequency resource location.
  • the resource and the CSI-RS sequence, and each CSI-RS sequence is transmitted on the determined physical resource.
  • Step 705 The UE obtains the physics occupied by each CSI-RS resource according to the bandwidth information corresponding to each non-zero-power CSI-RS resource in the measurement set, and the other information such as the port of the CSI-RS resource and the time-frequency resource location. Resources and CSI-RS sequences.
  • Step 706 The UE performs channel estimation according to the received and locally obtained CSI-RS sequences on the physical resources occupied by the respective CSI-RS resources, and obtains downlink channel information, thereby using the channel information to perform channel measurement or thousand. Disturbance measurement.
  • the method for transmitting the transmission bandwidth of the zero-power CSI-RS resource and performing the interference suppression in this embodiment is as follows:
  • Step 801 The base station determines, as the bandwidth information corresponding to each zero-power CSI-RS resource of the UE, the system bandwidth of the non-zero-power CSI-RS resource of each of the first-scrambled cells.
  • Step 802 The base station notifies the UE of the bandwidth information corresponding to each zero-power CSI-RS resource by using the high layer signaling.
  • Step 803 The UE receives the bandwidth information corresponding to each zero-power CSI-RS resource by using the high-layer signaling.
  • Step 804 The base station combines the CSI-RS resource according to the bandwidth information of the non-zero power CSI-RS resource of the interference cell. Other information such as the source port, the time-frequency resource location, and the like, obtains the physical resource occupied by the CSI-RS resource of the interference cell and the CSI-RS sequence, and sends the CSI-RS sequence of the interference cell on the determined physical resource.
  • Step 805 The UE obtains physical resources occupied by each zero-power CSI-RS resource according to the bandwidth information corresponding to the zero-power CSI-RS resource, the port of the zero-power CSI-RS resource, and the time-frequency resource location. .
  • Step 806 The UE performs PDSCH muting on the physical resources occupied by the respective zero-power CSI-RS resources, so as to avoid the interference of the non-zero-power CSI-RS resources of the interference cell to the PDSCH transmission.
  • the method for transmitting the transmission bandwidth of the DMRS and performing channel estimation in this embodiment is as follows: Assume that there are two cells simultaneously transmitting PDSCH to the UE, and the system bandwidths of the two cells are 5M and 10M, respectively. Then the processing of its DMRS is as follows:
  • the base station informs the UE in advance of the value of the transmission bandwidth corresponding to the different cells in the cooperation set and the corresponding index by the high layer signaling.
  • Step 901 The base station determines, according to the system bandwidth configuration of the cell that currently transmits the PDSCH to the UE, that the system bandwidth of one cell is the transmission bandwidth corresponding to the DMRS of the UE.
  • the system bandwidth configuration of the cell that currently transmits the PDSCH to the UE that the system bandwidth of one cell is the transmission bandwidth corresponding to the DMRS of the UE.
  • the smaller transmission bandwidth is the transmission bandwidth corresponding to the DMRS of the UE, that is, the 5M bandwidth is used as the transmission bandwidth corresponding to the DMRS of the UE.
  • Step 902 The base station indicates, by using the PDCCH signaling, an index of the cell in which the UE currently transmits the PDSCH in the cooperation set.
  • Step 903 After receiving the index information, the UE obtains the system bandwidth of the cell that currently transmits the PDSCH according to the index of the cell in the coordinated set and the bandwidth information of the different cell in the coordinated set, that is, the transmission corresponding to the DMRS of the UE. bandwidth.
  • Step 904 The base station obtains the physical resource and the DMRS sequence occupied by the DMRS according to the transmission bandwidth corresponding to the DMRS and the physical resources occupied by the downlink PDSCH transmission, and the other information such as the port of the DMRS and the scrambling ID, and the determined physical
  • the DMRS sequence is sent on the resource.
  • Step 905 The UE obtains the physical resource occupied by the DMRS according to the transmission bandwidth corresponding to the DMRS and the resource information indicated by the resource indication field in the DCI.
  • Step 906 The UE obtains a DMRS sequence according to the bandwidth corresponding to the DMRS and the physical resources occupied by the DMRS, and other information such as the port of the DMRS and the scrambling ID.
  • Step 907 The UE performs channel estimation according to the received and locally obtained DMRS sequences on the physical resources occupied by the DMRS, and obtains downlink channel information, so that the information is used for demodulation.
  • the method for transmitting downlink data transmission bandwidth and receiving downlink data in this embodiment is as follows: Assume that there are currently three cells in a coordinated set of UEs, and the system bandwidths of the three cells are 5M, 5M, and 10M, respectively.
  • the three cells may transmit the PDSCH to the UE at the same time, or may be one or two cells transmit to the UE.
  • Step 1001 The base station determines a transmission bandwidth corresponding to the downlink data of the UE according to a system bandwidth configuration of a cell that may transmit the PDSCH to the UE. Since there are currently three cells that may transmit PDSCH to the UE, there are 2 cells in the 5M bandwidth and 1 cell in the 10M bandwidth. Since the number of cells corresponding to the 5M bandwidth is large, 5M is taken as
  • the transmission bandwidth corresponding to the downlink data of the UE is the transmission bandwidth corresponding to the downlink data of the UE.
  • Step 1002 The base station notifies the UE of the transmission bandwidth corresponding to the downlink data transmission by using the high layer signaling.
  • Step 1003 The UE receives the transmission bandwidth corresponding to the downlink data transmission by using the high layer signaling.
  • Step 1004 The base station determines, according to the scheduling result, the physical resource occupied by the downlink data transmission on the corresponding transmission bandwidth, and notifies the UE of the physical resource information to the UE through the resource indication field of the DCI.
  • Step 1005 The base station sends corresponding downlink data on the physical resource occupied by the downlink data transmission.
  • Step 1006 The UE obtains the physical resource occupied by the downlink data transmission according to the resource information indicated by the resource indication field in the DCI according to the bandwidth corresponding to the downlink data transmission.
  • Step 1007 The UE demodulates the downlink data on the physical resources occupied by the downlink data transmission.
  • the transmission process of the transmission bandwidth in multi-point cooperation is understood by the above description.
  • the process is mainly implemented by the base station and the UE.
  • the internal structure and functions of the two devices are described below.
  • the base station in this embodiment includes: a control module 1101 and an interface module 1102.
  • the control module 1101 is configured to determine a transmission bandwidth for downlink data or a reference signal that requires the UE to learn bandwidth information in multiple cells coordinated by multiple points.
  • the interface module 1102 is configured to send, to the UE, the determined indication information of the transmission bandwidth corresponding to the corresponding downlink data or the reference signal.
  • the control module 1101 is further configured to determine, according to a transmission bandwidth determined for the reference signal, a sequence of physical resources and reference signals to be occupied by the reference signal, and instruct the interface module to transmit the sequence of the reference signal on the physical resource; or, control The module 1101 determines the physical resource occupied by the downlink data according to the transmission bandwidth determined for the downlink data, and instructs the interface module to transmit the indication information of the physical resource to the UE, and then transmit the downlink data on the physical resource.
  • the reference signal includes one or more of CRS, DMRS, zero-power CSI-RS, and non-zero-power CSI-RS.
  • the control module 1101 determines the system bandwidth of the cell that transmits the CRS that needs the UE to know the bandwidth information as the transmission bandwidth corresponding to the CRS.
  • the control module 1101 determines a system bandwidth of a cell transmitting a CSI-RS resource of a non-zero power that requires the UE to learn bandwidth information as a transmission corresponding to a non-zero power CSI-RS resource. Belt width.
  • the control module 1101 determines the system bandwidth of the interfering cell of the non-zero-power CSI-RS resource corresponding to the zero-power CSI-RS resource that needs the UE to know the bandwidth information to be zero.
  • the transmission bandwidth corresponding to the power CSI-RS resource is the system bandwidth of the interfering cell of the non-zero-power CSI-RS resource corresponding to the zero-power CSI-RS resource that needs the UE to know the bandwidth information to be zero.
  • the control module 1101 determines a transmission bandwidth for the DMRS according to the system bandwidth of the cell of the DMRS that the UE needs to know the bandwidth information.
  • control module 1101 selects one system bandwidth from the system bandwidth configurations of the multiple cells to determine the transmission bandwidth corresponding to the reference signal.
  • the control module 1101 determines the system bandwidth of the cell of the downlink data to the UE according to the need, and determines a transmission bandwidth for the downlink data. If there are multiple cells that need to transmit downlink data to the UE, the control module 1101 selects one system bandwidth from the system bandwidth configurations of the multiple cells to determine the transmission bandwidth corresponding to the corresponding downlink data.
  • the indication of bandwidth can take many forms and there are multiple notification methods. E.g:
  • the indication information of the transmission bandwidth is the value of the transmission bandwidth; the interface module 1102 transmits the value of the determined transmission bandwidth to the UE through the high layer signaling.
  • the indication information of the transmission bandwidth is an index of the value of the transmission bandwidth; the interface module 1102 transmits an index of the value of the determined transmission bandwidth to the UE through higher layer signaling.
  • the indication information of the transmission bandwidth is an index of the value of the transmission bandwidth; the interface module 1102 sends the system bandwidth of the multiple coordinated multi-cells to the UE by using the high-layer signaling; and the determined transmission by the physical downlink control channel PDCCH signaling The index of the bandwidth is sent to the UE.
  • the control module has several functions for different applications. E.g:
  • control module 1101 is further configured to determine, according to the transmission bandwidth determined for the reference signal, a physical resource to be occupied by the reference signal, and generate a sequence of the reference signal according to the transmission bandwidth determined for the reference signal, and indicate the interface module in the reference signal A sequence of generated reference signals is sent on the physical resources to be occupied.
  • control module 1101 is further configured to determine, according to the transmission bandwidth determined for the downlink data, the physical resource to be occupied by the downlink data, and instruct the interface module 1102 to send the indication information of the physical resource to the UE, and on the physical resource.
  • the phase UE transmits downlink data.
  • the interface module 1102 sends the indication information of the physical resource to the UE through the downlink DCI.
  • the UE in this embodiment includes: an interface module 1201 and a control module 1202.
  • the interface module 1201 is configured to receive indication information of a transmission bandwidth corresponding to the downlink data or the reference signal in the multiple cells that are coordinated by the base station and sent by the base station.
  • the control module 1202 is configured to determine, according to the transmission bandwidth indicated by the indication information, physical resources occupied by the downlink data, and perform data detection on the determined physical resources.
  • control module 1202 is configured to determine, according to the transmission bandwidth indicated by the indication information, physical resources occupied by the downlink data, and perform interference suppression on the determined physical resources.
  • control module 1202 is configured to determine, according to the transmission bandwidth indicated by the indication information, a sequence of physical resources and reference signals occupied by the downlink reference signal, and perform channel estimation according to the corresponding sequence on the determined physical resources.
  • the reference signal includes one or more of CRS, DMRS, zero power CSI-RS, and non-zero power CSI-RS.
  • the indication information of the bandwidth may be multiple.
  • the indication information of the transmission bandwidth is the value of the transmission bandwidth.
  • the interface module 1201 receives the value of the transmission bandwidth sent by the base station to the UE through the high layer signaling.
  • the indication information of the transmission bandwidth is an index of the value of the transmission bandwidth; the interface module 1201 receives, by higher layer signaling, an index of the value of the transmission bandwidth sent by the base station to the UE.
  • the indication information of the bandwidth is an index of the value of the transmission bandwidth; the interface module 1201 receives the system bandwidth of the multiple coordinated multi-cells sent by the base station by using the high-layer signaling; and receives the transmission sent by the base station by using the physical downlink control channel PDCCH signaling.
  • the index of the value of the bandwidth is an index of the value of the transmission bandwidth.
  • the control module 1202 has multiple specific functions. For example, the control module 1202 determines the length of the sequence of the reference signal according to the transmission bandwidth corresponding to the reference signal indicated by the indication information, thereby obtaining a sequence of the reference signal; or Obtaining a sequence of the reference signal according to a transmission bandwidth corresponding to the downlink reference signal indicated by the indication information and a physical resource occupied by the downlink reference signal; or, a transmission bandwidth corresponding to the downlink data indicated by the indication information, combined with the base station
  • the resource information in the transmitted DCI indicates the resource information indicated by the domain, and the physical resource occupied by the downlink data is obtained, and then the PDSCH muting operation is performed on the physical resource occupied by the determined downlink reference signal, or the determined downlink reference signal is occupied.
  • the interference measurement operation is performed on the physical resources.
  • the UE needs to know a plurality of reference signals or downlink data of the bandwidth information, for example, there are two CRSs and three CSI-RSs, respectively, the corresponding operations need to be performed by the method of the present invention.
  • the base station determines the transmission bandwidth for the downlink data or the reference signal that needs to be transmitted to the UE in the multiple cells that are coordinated by multiple points, and sends the determined transmission bandwidth to the UE, so that the UE obtains the exact in the multi-point cooperation system.
  • the transmission bandwidth for the downlink data or the reference signal is consistent with the base station to implement operations such as channel measurement, interference suppression, and data reception.
  • the embodiment of the present invention is also applicable to various application scenarios for the indication manner of the downlink data transmission and the transmission bandwidth of various reference signals and the subsequent application operations.
  • the embodiments of the present invention have wide applicability and can be applied to any antenna number and antenna array (such as line array, polarization array), arbitrary duplex system (TDD (Time Division Duplex) system or FDD (Frequency Division Duplex) system). ) and any transmission mode (such as SU-MIMO, MU-MIMO, CoMP) Downlink transmission. It is especially suitable for the two transmission mechanisms of dynamic cell handover and joint transmission in the CoMP mechanism.
  • SU-MIMO Time Division Duplex
  • MU-MIMO Time Division Duplex
  • CoMP CoMP
  • embodiments of the present invention can be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment, or a combination of software and hardware. Moreover, the present invention is in the form of a computer program product embodied on one or more computer-usable storage media (including but not limited to disk storage and optical storage, etc.) in which computer usable program code is embodied.
  • the computer program instructions can also be stored in a computer readable memory that can direct a computer or other programmable data processing device to operate in a particular manner, such that the instructions stored in the computer readable memory produce an article of manufacture comprising the instruction device.
  • the apparatus implements the functions specified in one or more blocks of a flow or a flow and/or block diagram of the flowchart.
  • These computer program instructions can also be loaded onto a computer or other programmable data processing device such that a series of operational steps are performed on a computer or other programmable device to produce computer-implemented processing for execution on a computer or other programmable device.
  • the instructions provide steps for implementing the functions specified in one or more of the flow or in a block or blocks of a flow diagram.

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

Abstract

La présente invention concerne un procédé et un dispositif de transmission d'informations de largeur de bande, qui sont utilisés pour mettre en œuvre une transmission d'informations de largeur de bande dans un système CoMP. Le procédé comprend les étapes suivantes : une station de base détermine une largeur de bande de transmission en fonction des données de liaison descendante ou d'un signal de référence pour lequel un UE doit apprendre les informations de largeur de bande dans une pluralité de cellules multipoints coordonnées; la station de base envoie à l'UE les informations d'indication de la largeur de bande de transmission déterminée correspondant au signal de référence ou aux données de liaison descendante correspondantes; et la station de base détermine, selon la largeur de bande de transmission déterminée en fonction du signal de référence, une ressource physique qui sera occupée par le signal de référence et une séquence du signal de référence, et transmet la séquence du signal de référence sur la ressource physique, ou la station de base détermine, selon la largeur de bande de transmission déterminée en fonction des données de liaison descendante, une ressource physique qui sera occupée par les données de liaison descendante, envoie les informations d'indication de la ressource physique à l'UE, et transmet ensuite les données de liaison descendante sur la ressource physique.
PCT/CN2012/087570 2012-01-18 2012-12-26 Procédé et dispositif de transmission d'informations de largeur de bande WO2013107259A1 (fr)

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