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WO2013016969A1 - Procédé de transmission de données de liaison descendante et station de base - Google Patents

Procédé de transmission de données de liaison descendante et station de base Download PDF

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Publication number
WO2013016969A1
WO2013016969A1 PCT/CN2012/075501 CN2012075501W WO2013016969A1 WO 2013016969 A1 WO2013016969 A1 WO 2013016969A1 CN 2012075501 W CN2012075501 W CN 2012075501W WO 2013016969 A1 WO2013016969 A1 WO 2013016969A1
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WIPO (PCT)
Prior art keywords
cell
base station
terminal
coordinated
cells
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PCT/CN2012/075501
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English (en)
Chinese (zh)
Inventor
赵瑜
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ZTE Corp
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ZTE Corp
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Anticipated expiration legal-status Critical
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Classifications

    • 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
    • H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
    • H04W16/24—Cell structures
    • H04W16/28—Cell structures using beam steering
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/20—Control channels or signalling for resource management
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W92/00—Interfaces specially adapted for wireless communication networks
    • H04W92/16—Interfaces between hierarchically similar devices
    • H04W92/20—Interfaces between hierarchically similar devices between access points

Definitions

  • the present invention relates to a multipoint coordinated transmission technology, and in particular, to a downlink data transmission method and a base station.
  • CoMP Cooperative Multi-Point Transmission
  • the traditional multi-point coordinated transmission technology is that the information of the terminal is stored in the primary cell, and the scheduling of the terminal is performed in the primary cell, and the control information of the primary cell scheduling and the physical layer coding mapping is transmitted to the control information through the X2 interface.
  • the coordinated cell is then processed in accordance with the will of the primary cell.
  • the coordinated cell provides only one physical channel for the primary cell in the CoMP transmission process, and does not participate in the scheduling management process of the UE.
  • the embodiments of the present invention provide a downlink data transmission method and a base station, so as to solve the problem that the edge terminal has low throughput and interference between neighboring terminals.
  • the embodiment of the present invention provides a method for transmitting downlink data, which is applied to a coordinated multi-point (CoMP) cell, where the CoMP cell includes a master cell and a coordinated cell, and the method includes: the base station of the master cell according to the terminal The channel estimation information of the terminal measured by the two cell base stations is calculated, and the scheduling information of the two cells is calculated, where the scheduling information includes a beamforming (BF) weight;
  • CoMP coordinated multi-point
  • the base station of the master cell sends the scheduling information of the coordinated cell where the terminal is located to the base station of the cooperative cell, and the base stations of the two cells perform dual-stream BF transmission according to the scheduling information of the respective cell.
  • the base station of the primary control cell is configured according to the current terminal measured by two cell base stations where the terminal is located.
  • the channel estimation information is calculated, and the scheduling information of the two cells is obtained, including:
  • the base station of the master cell calculates and obtains scheduling information of the two cells according to channel estimation information of the terminal that is measured and reported by the coordinated cell base station where the terminal is located, and channel estimation information of the terminal that is measured by the master cell;
  • the base station of the master cell sends the scheduling information of the coordinated cell where the terminal is located to the base station of the cooperative cell, and the base stations of the two cells perform dual-stream BF transmission according to the scheduling information of the respective cell, including:
  • the base station of the primary control cell sends scheduling information of the coordinated cell where the terminal is located to the base station of the coordinated cell, and the base station of the primary control cell and the base station of the coordinated cell perform dual-flow BF transmission according to scheduling information of the respective cell. ;
  • the base station of the master cell calculates the scheduling information of the two cells according to the channel estimation information of the terminal measured by the two cell base stations where the terminal is located, and includes:
  • the base station of the master cell calculates and obtains the scheduling information of the two cells according to the channel estimation information of the terminal that is measured and reported by the two coordinated cell base stations where the terminal is located;
  • the base station of the master cell sends the scheduling information of the coordinated cell where the terminal is located to the base station of the cooperative cell, and the base stations of the two cells perform dual-stream BF transmission according to the scheduling information of the respective cell, including:
  • the base station of the primary control cell sends the scheduling information of the two coordinated cells in which the terminal is located to the base station of the corresponding coordinated cell, and the base stations of the two coordinated cells perform dual-stream BF transmission according to the scheduling information of the respective cells.
  • the method is performed by the base station of the master cell, according to the channel estimation information of the current terminal measured by the two cell base stations where the terminal is located, and the method for calculating the scheduling information of the two cells, the method further includes:
  • the base station of the primary control cell sends the sounding reference signal (SRS) information of the current terminal to the base station of the coordinated cell where the terminal is located by using X2 signaling;
  • SRS sounding reference signal
  • the base station of the coordinated cell measures the terminal of the coordinated cell according to the SRS information.
  • the base station of the primary control cell sends the SRS information of the terminal to the base station of the coordinated cell where the terminal is located by using the X2 signaling, including:
  • the base station of the master cell sends the SRS information of the current terminal to the base station of the coordinated cell where the current terminal is located by using the X2 signaling according to the request of the cell base station with the high priority of the two cells.
  • the channel estimation information of the terminal or the service priority information of the coordinated cell reported by the coordinated cell base station is reported by the coordinated cell base station by using X2 signaling.
  • the scheduling information further includes a rank of a transmission matrix of the two cells reaching the current terminal;
  • the base station of the master cell sends the scheduling information of the coordinated cell where the terminal is located to the base station of the cooperative cell, and the base stations of the two cells perform dual-stream BF transmission according to the scheduling information of the respective cell, including:
  • the control information for performing dual-flow BF transmission is sent to the two cell base stations, and after receiving the control information, the base stations of the two cells are The scheduling information of the respective cells performs dual-stream BF transmission.
  • the method further includes:
  • the base station of the primary control cell determines that the rank of the transmission matrix is less than 2, the base station of one of the two cells performs single-flow BF transmission according to the scheduling information of the own cell; and the cell that does not perform single-flow BF transmission The base station reduces interference to the terminal according to scheduling information of its own cell.
  • the embodiment of the present invention further provides a base station, which is applied to a coordinated multi-point (CoMP) cell, where the CoMP cell includes a primary control cell and a coordinated cell, where the base station includes a first module and a second module, where:
  • CoMP coordinated multi-point
  • the first module is configured to: when the base station is the base station of the primary control cell, calculate, according to the channel estimation information of the current terminal measured by the two cell base stations where the terminal is located, obtain scheduling information of the two cells; Transmitting the scheduling information of the coordinated cell where the terminal is located to the base station of the coordinated cell; performing dual-flow beamforming (BF) transmission according to the scheduling information of the primary control cell and the base station of the coordinated cell where the terminal is located;
  • the scheduling information includes a BF weight value;
  • the second module is configured to: when the base station serves as a base station of the coordinated cell, perform dual-flow BF transmission according to the scheduling information of the coordinated cell where the terminal is located, and the coordinated cell of the current terminal where the current terminal is located.
  • the scheduling information is dual-stream BF transmission with the base station of another coordinated cell where the current terminal is located.
  • the first module is configured to:: measure, and report, the current terminal channel according to the base station of the coordinated cell where the current terminal is located. Estimating information and channel estimation information of the current terminal measured by itself, and calculating scheduling information of the two cells;
  • the first module is configured to: obtain the two channels according to the channel estimation information of the terminal that is measured and reported by the base stations of the two coordinated cells where the terminal is located. Scheduling information for each cell.
  • the first module is further configured to: send, by using X2 signaling, the sounding reference signal (SRS) information of the terminal to a base station of the cooperative cell where the terminal is located;
  • SRS sounding reference signal
  • the second module is further configured to: obtain channel estimation information of the terminal according to the SRS information sent by the base station of the master cell where the terminal is located, and report the channel estimation information of the terminal to the base station of the master cell.
  • the first module is configured to: send the terminal to the base station of the coordinated cell where the terminal is located by using X2 signaling according to the request of the cell base station with high service priority in the two cells. SRS information.
  • the scheduling information further includes a rank of a transmission matrix of the two cells reaching the terminal;
  • the first module is further configured to: when determining that the rank of the transmission matrix is equal to 2, send control information for performing dual-flow BF transmission to the two cell base stations, where the control information is used to trigger the two cell base stations Perform dual stream BF transmission.
  • the downlink data transmission method and the base station improve the throughput of the edge terminal by using the downlink dual-stream BF transmission, and reduce the interference of the neighboring area to the edge terminal.
  • FIG. 4 181203358 1 is a schematic diagram of a dual-stream transmission embodiment of a distributed networking CoMP according to the present invention
  • FIG. 2 is a schematic diagram of a terminal multi-bearer establishing embodiment of the distributed networking in the present invention
  • FIG. 3 is a terminal single bearer of the distributed networking of the present invention
  • FIG. 4 is a schematic diagram of an embodiment of a distributed network master d and zone trigger data transmission according to the present invention
  • FIG. 5 is a schematic diagram of an embodiment of trigger data transmission of a distributed networking cooperative cell according to the present invention.
  • FIG. 6 is a schematic diagram of a distributed network dual-stream BF transmission embodiment of the present invention.
  • FIG. 7 is a schematic diagram of a distributed network single stream BF transmission embodiment of the present invention.
  • FIG. 8 is a schematic structural diagram of a base station according to an embodiment of the present invention. Preferred embodiment of the invention
  • the embodiment of the invention provides a method for transmitting downlink data based on the distributed networking CoMP method.
  • the system determines, according to the test report of the terminal, that the terminal enters the CoMP cell and then decomposes the dedicated bearer of the terminal according to the actual demand, and establishes the bearer according to the traffic demand, such as the guaranteed bit rate (GBR) requirement and the actual condition (mainly load) distribution of each cell.
  • the traffic demand such as the guaranteed bit rate (GBR) requirement and the actual condition (mainly load) distribution of each cell.
  • GBR guaranteed bit rate
  • the distributed bearer can split a bearer into two cells or establish different bearers of the terminal into two cells.
  • the downlink data on the corresponding bearer can be directly passed through the S1 port. Send to the corresponding cell (or within the eNodeB).
  • each of the cells participating in the CoMP cooperation separately processes the data of each bearer delivered by S1, and each forms a transport block (TB).
  • the location of the physical layer resource block (RB) allocation and precoding (downlink beamforming weighting weight) and scrambling information are sent by the master cell through the X2 port.
  • the X2 port mainly carries control information ( For example, precoding and scrambling information at the time of downlink transmission, and acknowledgment acknowledgment (ACK)/negative acknowledgment (NACK) information of the downlink automatic hybrid retransmission request (HARQ) feedback.
  • the embodiment of the invention provides a downlink data transmission method, which is applied to multi-point coordinated transmission.
  • the CoMP cell includes a master cell and a coordinated cell
  • the method includes: Step 1: The base station of the master cell calculates channel estimation information of the current terminal according to two cell base stations where the current terminal is located Calculating scheduling information of the two cells, where the adjustment is performed
  • 5 181203358 Degree information includes beamforming (BF) weights
  • the base station of the primary control cell calculates and obtains the two channels according to the channel estimation information of the current terminal measured by the two cell base stations where the current terminal is located.
  • the scheduling information of the cell includes: the channel estimation information of the current terminal measured and reported by the base station of the coordinated cell where the current terminal is located, and the channel estimation information of the current terminal measured by the master cell, Calculating the scheduling information of the two cells; the base station of the primary control cell sends the scheduling information of the coordinated cell where the current terminal is located to the base station of the coordinated cell, and the base stations of the two cells are scheduled according to the respective cells.
  • the base station of the primary control cell calculates and obtains the scheduling information of the two cells according to the channel estimation information of the current terminal measured by the two cell base stations where the current terminal is located, including: The base station of the master cell calculates and obtains the scheduling information of the two cells according to the channel estimation information of the current terminal that is measured and reported by the two coordinated cell base stations where the current terminal is located; the base station of the master control cell
  • the scheduling information of the coordinated cell where the current terminal is located is sent to the base station of the coordinated cell, and the base station of the two cells performs the dual-flow BF transmission according to the scheduling information of the respective cell, including: the base station of the primary control cell
  • the method may further include: the core network establishes a bearer in a distributed manner to the master cell and the coordinated cell; and the base station of the master cell passes the request of the cell base station with a high priority in the two cells,
  • the X2 signaling sends the SRS information of the current terminal to the base station of the coordinated cell where the current terminal is located, and the base station of the coordinated cell measures the channel estimation information of the current terminal in the coordinated cell according to the SRS information.
  • the distributed allocation establishment method of the bearer is shown in FIG. 2, and the split establishment method of the bearer is as shown in FIG. 3.
  • the master cell triggers the core network side to initiate the bearer reconfiguration process through the S1 interface signaling, and the master cell refers to the signal quality load of each coordinated cell to the core network. Suggestions for establishing a community.
  • Core network
  • FIG. 6 illustrates a method for establishing bearer splitting.
  • the eNodeB side triggers the core network side to initiate bearer split re-establishment.
  • the scheduling priority of this bearer is a problem that must be considered.
  • a method for triggering CoMP scheduling based on service priority is proposed in the embodiment of the present invention. Specifically, each cell participating in the CoMP performs priority scheduling processing according to the UE activated in the cell. When a certain cell (whether a CoMP master cell or a CoMP coordinated cell) is sorted out, the service priority of the CoMP terminal is high, and when scheduling is required, the cell is triggered to notify the master cell to perform CoMP transmission scheduling.
  • the coordinated cell informs the master cell through the X2 port to perform scheduling decisions, the resource allocation of the scheduling, the decision of the transmission mode, the selection of the precoding, and whether the CoMP transmission is immediately required to perform the master control cell.
  • the master cell decision needs to be scheduled and the scheduling is completed, and the CoMP cooperation cell is notified to perform corresponding transmission.
  • the coordinated cell preferentially responds to the CoMP scheduling command.
  • the master cell also notifies the CoMP transmission that does not participate in the co-transmission of the neighboring area with large interference to perform interference avoidance.
  • the process of triggering data transmission in the distributed network master cell can be seen in Figure 4.
  • the process of triggering data transmission in the distributed network cooperative cell can be seen in Figure 5.
  • Step 2 The base station of the primary control cell sends the scheduling information of the coordinated cell where the current terminal is located to the base station of the coordinated cell, and the base stations of the two cells perform dual-stream BF transmission according to the scheduling information of the respective cell.
  • the scheduling information further includes a rank of a transmission matrix of the two cells reaching the current terminal, where the base station of the master cell sends scheduling information of the coordinated cell where the current terminal is located to a base station of the coordinated cell, where The base stations of the two cells perform dual stream according to the scheduling information of the respective cells.
  • the BF transmission includes: when the base station of the primary control cell determines that the rank of the transmission matrix is equal to 2, and sends control information for performing dual-flow BF transmission to the two cell base stations, where the base stations of the two cells receive the After the control information, the dual stream BF transmission is performed according to the scheduling information of the respective cells.
  • the BF-based dual-stream transmission in the distributed networking mode is shown in Figure 6.
  • the BF-based single-stream transmission is shown in Figure 7; the coordinated cell resolves the terminal's Sounding-RS (SRS) information or the physical uplink shared channel (
  • the demodulation reference signal (DMRS) information of the PUSCH is used to estimate the uplink channel.
  • SRS Sounding-RS
  • DMRS demodulation reference signal
  • the SRS subframes of the cells in the CoMP range can be configured consistently, which can reduce the PUSCH or the physical layer. Interference from the uplink control channel (PUCCH) or other signals to the SRS channel.
  • PUCCH uplink control channel
  • the master cell When the terminal enters the CoMP mode, the master cell is triggered to transmit the configuration information of the SRS dedicated to the UE to the CoMP coordinated cell, so that the coordinated cell correctly parses the SRS of the terminal.
  • the coordinated cell will transmit the channel estimation information estimated by the SRS, such as the channel transmission matrix H, to the master cell, and carry the time stamp of H.
  • the master cell calculates the BF weight of each cell and the correlation of each cell to the terminal transmission channel according to the H transmitted by the coordinated cell and the H estimated by itself (the correlation reflects the concept of rank (RI), and determines whether it can be done. Double flow BF).
  • the physical layer of the master and the cooperative cell weights the downlink transmission according to the BF weight calculated by the master cell, thereby implementing the BF shaping of the downlink dual stream between the CoMP coordinated cells, as shown in FIG. 6.
  • the master cell can control the data BF direction without service transmission, thereby reducing interference to the target terminal.
  • the S1 and X2 signaling can be used to complete the above process.
  • the description of the S1 and X2 signaling is as follows: S1: After the terminal enters the CoMP, the master cell notifies the core network to perform the redistribution of the bearer. The information to be carried includes: The allocation request, the cell number of the CoMP is recommended. After receiving the request from the master cell, the core network initiates a bearer re-establishment process and carries a response (success or failure) of the bearer redistribution;
  • the master cell After the bearer re-allocation is successful, the master cell sends the SRP information dedicated to the CoMP terminal to the CoMP coordinated transmission cell, so that the CoMP coordinated cell can correctly parse the dedicated SRS sent by the terminal;
  • the CoMP coordinated cell When the CoMP coordinated cell needs to send data, it will send a transmission request message to the master cell, including the amount of data to be transmitted (in Bytes), and the transmission priority (1 to 15 levels can be defined. The higher the priority, the higher the channel estimation information of the SRS sent by the terminal (based on the Resource Block (RB), the granularity, on one RB.
  • RB Resource Block
  • X2 After the scheduling of the master cell is complete, the coordinated cell needs to be notified to transmit and carry the scheduling result information, including the allocated RB location, the length of the RB, the weight of the downlink BF, and the UE-specific port (Port7 or Port8 reference TS36.211 R9 protocol) ;
  • the terminal feeds back the ACK/NACK to the master cell. If the ACK is fed back, the master cell transmits the ACK to the coordinated cell, so that the coordinated cell releases the HARQ process. If the NACK is fed back, the master cell will schedule the coordinated cell to perform retransmission.
  • the distributed bearer is established, so that the transmission of the CoMP downlink data is transmitted from the S1 port, and only the control information is transmitted on the X2 port, which reduces the pressure of the X2 port.
  • it lays a foundation for load balancing of each cell, and downlink dual-flow BF improves the throughput of edge terminals.
  • FIG. 4 it is a schematic diagram of an embodiment of the triggering data transmission of the distributed network master cell of the present invention.
  • the target terminal is located at the edge of the master cell and the coordinated cell, and the transmission process includes:
  • Step 401 The CoMP terminal in the main control cell has a service arrival, and triggers the main control cell to perform service scheduling.
  • the main control cell starts scheduling, and the H value of the target terminal of the CoMP coordinated cell reported by the CoMP cooperative transmission cell and the H value of the target terminal measured by the own cell are queried, and the weighting value and the RB position of the two cells are calculated. Size
  • Step 402 The primary control cell notifies the CoMP coordinated cell scheduling information by using the X2 interface.
  • Step 403 The master cell and the coordinated cell check whether the target terminal has data to send, and if yes, perform precoding processing.
  • Step 404 The coordinated cell sends the data by using the BF technology according to the scheduling information sent by the primary control cell.
  • the coordinated cell and the primary control cell jointly complete the dual-flow BF transmission to the target terminal; as shown in FIG. 6, the eNB1 and the eNB2 jointly complete.
  • the eNB3 performs the dual-flow beamforming on the target terminal, and the eNB3 performs the Trunking to avoid the transmission. If there is no data, the cell refers to the RB information sent by the primary control cell and the BF weight information for processing, and reduces the corresponding RB position. Interference of the target terminal; As shown in FIG. 7, only eNB1 performs downlink transmission on the target terminal, and eNB2 and eNB3 perform interference avoidance transmission.
  • the neighboring area that does not participate in the CoMP transmission is also processed on the corresponding RB by referring to the scheduling information sent by the primary control cell, thereby reducing interference to the target terminal;
  • Step 405 The terminal parses the downlink information according to whether the CRC checks the ACK/NACK to the primary control cell.
  • Step 406 The master cell parses the feedback to the terminal, and if the ACK is parsed, the coordinated cell is notified to release the corresponding cache, and if the NACK is received, the retransmission scheduling process is performed.
  • FIG. 5 it is a schematic diagram of a method for triggering data transmission in a distributed networking cooperative cell according to the present invention.
  • a target terminal is located at an edge of a primary control cell and a coordinated cell, and the transmission process includes:
  • Step 501 The coordinated cell has a service arrival, and the coordinated cell notifies the main control cell that the service arrives through the X2 port, and carries information such as the service block size and the service priority.
  • Step 502 After receiving the information, the master cell performs scheduling processing. If the service priority of the coordinated cell is not high and the physical resources of the system are relatively tight, the primary control cell may not respond to the scheduling requirement, and only store the service request of the coordinated cell. If the coordinated cell does not respond after sending the service scheduling request, it will continue to wait. If new service data arrives during the waiting process, and the priority of the new service data is higher than the priority reported to the primary control cell, the coordinated cell The scheduling request will be reported again to the master cell. If the master cell determines that scheduling is required, steps 503-506 and step 403-406 in the embodiment of the master cell trigger data transmission embodiment.
  • the terminal dedicated port Port7, Port8 can be used.
  • the calculation method may be calculated by the H reported by the coordinated cell and the H measured by the own cell, if R 2 , then only one stream can be transmitted at a time.
  • the embodiment of the present invention further provides a base station, which is applied to a coordinated multi-point (CoMP) cell, where the CoMP cell includes a primary control cell and a coordinated cell.
  • the base station includes a first module 801 and a second. Module 802, wherein:
  • the first module 801 is configured to: when the base station is used as the base station of the primary control cell, calculate, according to the channel estimation information of the current terminal measured by the two cell base stations where the current terminal is located, obtain the scheduling of the two cells.
  • the information includes a beamforming (BF) weight;
  • the second module 802 is configured to: when the base station serves as a base station of the coordinated cell, according to scheduling information of the coordinated cell where the current terminal is located, and the master cell base station where the current terminal is located The dual-flow BF transmission is performed, or the dual-flow BF transmission is performed according to the scheduling information of the coordinated cell where the current terminal is located, and the base station of another coordinated cell where the current terminal is located.
  • BF beamforming
  • the first module 801 is used to measure and report the channel estimation information of the current terminal according to the base station of the coordinated cell where the current terminal is located, when the two cells in the current terminal are the primary control cell and the coordinated cell.
  • the channel estimation information of the current terminal measured by itself is calculated to obtain the scheduling information of the two cells; when the two cells where the current terminal is located are all coordinated cells, the first module 801 is used to locate the current terminal.
  • the channel estimation information of the current terminal measured and reported by the base station of the two coordinated cells is calculated, and the scheduling information of the two cells is calculated.
  • the first module 801 is further configured to perform the foregoing by X2 signaling.
  • the base station of the coordinated cell where the current terminal is located sends the sounding reference signal (SRS) information of the current terminal;
  • the second module 802 is further configured to obtain the current terminal according to the SRS information sent by the base station of the master cell where the current terminal is located.
  • the first module 801 is configured to send, by using X2 signaling, the current terminal to the base station of the coordinated cell where the current terminal is located, according to the request of the cell base station with high service priority in the two cells. SRS information.
  • the scheduling information further includes a rank of a transmission matrix of the two cells reaching the current terminal, where the first module 801 is further configured to determine that the rank of the transmission matrix is equal to two,
  • the two cell base stations send control information for performing dual-flow BF transmission, and the control information is used to trigger the two-cell base station to perform dual-stream BF transmission. If the two cells do not receive the control information for performing the dual-flow BF transmission, the base station of one of the two cells enters according to the scheduling information of the own cell.
  • the above base station improves the throughput of the edge terminal through the downlink dual stream BF transmission, and reduces the interference of the neighboring area to the edge terminal.
  • the above-described downlink data transmission method and base station improve the throughput of the edge terminal by the downlink dual-stream BF transmission, and reduce the interference of the neighboring area to the edge terminal.

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Abstract

Un procédé de transmission de données de liaison descendante et une station de base sont appliqués dans une cellule de transmission multipoint coopérative (CoMP), qui contient une cellule de commande principale et une cellule coopérative. Le procédé comprend les étapes suivantes : selon les informations d'estimation de canal d'un terminal courant mesurées par les stations de base des deux cellules dans lesquelles le terminal courant est situé, la station de base de la cellule de commande principale effectue un calcul pour obtenir des informations de planification des deux cellules qui contiennent les valeurs pondérées de formation de faisceaux (BF) ; la station de base de la cellule de commande principale transmet les informations de planification de la cellule coopérative dans laquelle le terminal courant est situé à la station de base de la cellule coopérative, et les stations de base des deux cellules exécutent une transmission BF double flux selon les informations de planification de chaque cellule. Le procédé de transmission de données de liaison descendante et la station de base permettent d'augmenter le débit d'un terminal de périphérie par la transmission BF double flux de liaison descendante, et de réduire les interférences émises depuis une cellule voisine vers le terminal de périphérie.
PCT/CN2012/075501 2011-07-29 2012-05-15 Procédé de transmission de données de liaison descendante et station de base Ceased WO2013016969A1 (fr)

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CN201110215356.3A CN102905285B (zh) 2011-07-29 2011-07-29 下行数据的传输方法及基站
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CN104519582B (zh) * 2013-09-27 2018-07-27 电信科学技术研究院 协作传输的实现方法与装置
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