CN106879076B - Data transmission method and device - Google Patents
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- CN106879076B CN106879076B CN201710247452.3A CN201710247452A CN106879076B CN 106879076 B CN106879076 B CN 106879076B CN 201710247452 A CN201710247452 A CN 201710247452A CN 106879076 B CN106879076 B CN 106879076B
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- H04W72/50—Allocation or scheduling criteria for wireless resources
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Abstract
The application discloses a data transmission method and device, relates to the technical field of communication, and can solve the problem that a base station is low in efficiency of transmitting service data by using an unauthorized frequency band. The data transmission method comprises the following steps: when a base station needs to send data to a target terminal, the base station acquires a user group identifier of the target terminal, and the base station locally acquires an effective CSI measurement result corresponding to the user group identifier of the target terminal; and sending data to the destination terminal according to the effective CSI measurement result. The method and the device are suitable for the data transmission process.
Description
Technical Field
The present application relates to the field of communications technologies, and in particular, to a method and an apparatus for data transmission.
Background
In a Frequency Division Duplex (FDD) system of a long Term Evolution (L ong Term Evolution, L TE), when a base station sends data to a user equipment, the base station needs to request the user equipment to perform Channel State Information (CSI) measurement and feed back a CSI measurement result, the base station obtains the Channel condition of a current downlink from the fed back CSI measurement result, and selects a corresponding transmission scheme to realize high-speed transmission of downlink data.
In order to meet the increasing demand of data services, communication operators have also started to transmit data using a resource-rich unlicensed frequency band, for example, L TE licensed Assisted Access (L AA) system, in the unlicensed frequency band, in order to avoid interference between different systems, a L AA system needs to monitor a Channel before transmitting data, perform Clear Channel Assessment (CCA), and transmit data using the unlicensed frequency band when it is ensured that the Channel is idle.
If the L AA system adopts the existing CSI feedback mechanism, the process from the transmission of the reference signal from the base station to the terminal to the reception of the CSI measurement result fed back by the terminal by the base station already occupies most of the continuous transmission time, which results in that the time actually used by the base station to transmit the service data is not much, and the amount of the transmitted service data is limited, thereby reducing the efficiency of the L AA system in transmitting the service data using the unlicensed frequency band.
Disclosure of Invention
The application provides a data transmission method and device, which can solve the problem that a base station has low efficiency of transmitting service data by using an unauthorized frequency band.
In order to achieve the purpose, the technical scheme is as follows:
in a first aspect, the present application provides a method for data transmission, where the method includes:
when a base station needs to send data to a target terminal, the base station acquires a user group identifier of the target terminal, wherein terminals in the same group can share one user group identifier, and terminals with the same user group identifier can share a Channel State Information (CSI) measurement result;
the base station locally acquires an effective CSI measurement result corresponding to the user group identification of the target terminal;
and the base station sends data to the target terminal according to the effective CSI measurement result.
In a second aspect, the present application provides an apparatus for data transmission, the apparatus comprising:
the processing unit is used for acquiring user group identifications of the target terminals, wherein the terminals in the same group can share one user group identification, and the terminals with the same user group identification can share the Channel State Information (CSI) measurement result;
obtaining an effective CSI measurement result corresponding to the user group identification of the target terminal from the local;
and the sending unit is used for sending data to the destination terminal according to the effective CSI measurement result obtained by the processing unit.
According to the data transmission method and device, when the base station needs to send data to the target terminal, the effective CSI measurement result in the packet is directly called according to the user group identification, and downlink data are sent to the target terminal. Compared with the prior art, the base station requires the terminal to perform CSI measurement and feed back a CSI measurement result before sending downlink data each time. However, in the unlicensed frequency band, the time consumption of the CSI measurement and feedback process is long, so that the efficiency of the base station transmitting the service data by using the unlicensed frequency band is low. In the method, the base station directly calls the effective CSI measurement result in the same group, so that the time for the terminal to perform CSI measurement and feedback is saved, more service data can be transmitted in the transmittable time, and the efficiency of the base station for transmitting the service data by using the unauthorized frequency band is improved.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a communication system according to an embodiment of the present application;
fig. 2 is a flowchart of a method for data transmission according to an embodiment of the present application;
fig. 3 is a flowchart of another data transmission method according to an embodiment of the present application;
fig. 4 is a flowchart of another method for data transmission according to an embodiment of the present application;
fig. 5 is a flowchart of another data transmission method according to an embodiment of the present application;
fig. 6 is a schematic structural diagram of a data transmission device according to an embodiment of the present application;
fig. 7 is a schematic structural diagram of another data transmission apparatus according to an embodiment of the present application;
fig. 8 is a schematic structural diagram of a data transmission system according to an embodiment of the present application.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
A data transmission method provided in an embodiment of the present application may be applied to a communication system shown in fig. 1, where the communication system includes a base station and at least one terminal, as shown in fig. 2, and a method flow of the present application is shown in fig. 2, and specifically includes:
101. and when the base station needs to send data to a target terminal, the base station acquires the user group identification of the target terminal.
Specifically, before the base station obtains the user group identifier of the target terminal, the base station needs to group the terminals in the service area in advance, and set a user group identifier for each group, where the user group identifier is unique at least in the base station and is used to distinguish other user groups in the base station, and the terminals in the same group share one user group identifier.
Wherein the base station may divide the served terminals into at least two groups according to the geographical location of the served terminals. The base station may also divide the served terminals into at least two groups according to the path loss between itself and the served terminals. The position may be obtained by a Global Positioning System (GPS), an observable Time Difference of arrival (OTDOA), or an Uplink Time Difference of arrival (U-TDOA). The present application does not limit the implementation of the grouping.
Specifically, after the base station groups the terminals in the service area, the terminals in each group have the same characteristics, such as the same location or the same path loss, and in a low mobility scenario, when the spatial characteristics and the channel quality are relatively static, these same characteristics indicate that the channel conditions between the base station and the terminals are similar, and the same CSI measurement results can be shared in a certain time. For example: suppose that there are three terminals, terminal a, terminal B and terminal C, in a packet within the service area of the base station, the channel conditions of the three terminals are similar. If the terminal a feeds back the CSI measurement result, when the base station needs to send downlink data to the terminal B or C, the CSI measurement result may be directly used to obtain the channel condition, and an appropriate transmission scheme is selected to send the downlink data to the terminal B or C. Therefore, when the base station needs to send data to the destination terminal, the CSI measurement results in the same group can be shared, and the user group identifier of the destination terminal needs to be obtained first.
102. And the base station locally acquires an effective CSI measurement result corresponding to the user group identification of the target terminal.
The base station locally pre-stores a CSI measurement result corresponding to the user group identifier, and the CSI measurement result is time-efficient, namely the CSI measurement result is valid within a preset time and invalid after the preset time. It should be noted that, each time the base station sends downlink data to the terminal in the same packet, the base station first invokes the valid CSI measurement result in the packet. When no valid CSI measurement result exists in the packet, the base station sends a reference signal to the terminal, and requires the terminal to perform CSI measurement, and then receives a new valid CSI measurement result. Therefore, within each packet, the base station locally stores at most one valid CSI measurement.
103. And the base station sends data to the target terminal according to the effective CSI measurement result.
Specifically, the base station selects a suitable modulation and demodulation coding mode, a resource allocation type and a specific transmission scheme according to the obtained effective CSI measurement result, the receiving capability of the target terminal and other factors, and sends data to the target terminal.
According to the data transmission method, when the base station needs to send data to the target terminal, the effective CSI measurement result in the packet is directly called according to the user group identification, and downlink data are sent to the target terminal. Compared with the prior art, the base station requires the terminal to perform CSI measurement and feed back a CSI measurement result before sending downlink data each time. However, in the unlicensed frequency band, the time consumption of the CSI measurement and feedback process is long, so that the efficiency of the base station transmitting the service data by using the unlicensed frequency band is low. In the method, the base station directly calls the effective CSI measurement result in the same group, so that the time for the terminal to perform CSI measurement and feedback is saved, more service data can be transmitted in the transmittable time, and the efficiency of the base station for transmitting the service data by using the unauthorized frequency band is improved.
Further, on the basis of fig. 2, considering that a data transmission method provided in the embodiment of the present application needs to store CSI measurement results for each packet in advance after grouping, as shown in fig. 3, before step 102, the method further includes:
201. the base station transmits first reference signals to a specified number of terminals in each group, respectively.
Wherein the first reference signal is used for instructing a specified number of terminals in each packet to perform CSI measurement.
Specifically, after grouping, the base station selects a specified number of terminals from each group, and transmits a reference signal to each selected terminal, and requests the terminals to perform CSI measurement and feed back CSI measurement results. The specified number of settings may be determined according to the geographical location of the terminal, or the path loss from the base station to the terminal, or the like.
For example, assume that the base station divides the terminals in the service area into 3 groups, named first group, second group, and third group, respectively. The first group includes a terminal a and a terminal B, the second group includes a terminal C, and the third group includes a terminal D and a terminal E. Taking the specified number of 1 as an example, the base station selects one terminal from the first packet, the second packet and the third packet, respectively, which are terminal a, terminal C and terminal E, and sends reference signals to the three terminals, which are required to perform CSI measurement.
202. And the base station respectively receives CSI measurement results fed back by the terminals in each group.
Illustratively, in conjunction with the example of step 201, the base station receives 3 CSI measurement results fed back by terminal a, terminal C, and terminal E, respectively.
203. And the base station correspondingly stores each received CSI measurement result and the user group identification of the terminal which sends each CSI measurement result respectively.
Specifically, when receiving a CSI measurement result fed back by a selected terminal, the base station obtains a user group identifier of the terminal, establishes a correspondence between the user group identifier and the CSI measurement result, and stores the correspondence locally. Thus, the base station pre-stores one CSI measurement for each packet.
Illustratively, in combination with the examples of steps 201 and 202, the base station stores the CSI measurement result fed back by the terminal a in correspondence with the user group identifier of the first group, stores the CSI measurement result fed back by the terminal C in correspondence with the user group identifier of the second group, and stores the CSI measurement result fed back by the terminal E in correspondence with the user group identifier of the third group.
204. And when the existence duration of the CSI measurement result exceeds the effective survival time limit, the base station sets the CSI measurement result to be invalid.
Specifically, since the channel condition has a time-varying characteristic, the base station needs to set an effective lifetime for the stored CSI measurement result according to the characteristics of the system and the variation of the channel.
And the base station sets the CSI measurement result to be valid while storing the CSI measurement result, starts a counter and sets the initial value of the counter to be zero. The value of the counter is automatically increased by 1 every Time a Transmission Time Interval (TTI) elapses, and the CSI measurement result is set to be invalid when the value of the counter exceeds a preset value. The preset value is the number of transmission time intervals included in the valid lifetime, so that when the value of the counter exceeds the preset value, the existence duration of the CSI measurement result also exceeds the valid lifetime, and at this time, the CSI measurement result needs to be set to be invalid.
On the basis of fig. 2, there may be a case that the base station does not acquire a valid CSI measurement result, and at this time, the base station needs to acquire the CSI measurement result through another method, so in another possible implementation manner provided in the embodiment of the present application, as shown in fig. 4, before step 103, steps 301 to 302 may also be performed:
301. and when the base station does not acquire the effective CSI measurement result, the base station transmits a second reference signal to the target terminal by using an unauthorized frequency band.
Wherein the second reference signal is used for instructing the destination terminal to perform CSI measurement.
Specifically, the situation that the base station does not acquire the valid CSI measurement result specifically includes that the valid CSI measurement result is invalid, or the target terminal does not belong to any existing grouping, and the like, at this time, the base station needs to send a second reference signal to the target terminal, and requires the target terminal to perform CSI measurement.
302. And the base station receives the CSI measurement result fed back by the target terminal from the authorized frequency band.
Specifically, after the destination terminal receives the second reference signal sent by the base station, the destination terminal performs CSI measurement and sends a CSI measurement result to the base station, where the CSI measurement result may carry information of the unlicensed frequency band used by the second reference signal. After receiving the CSI measurement result sent by the destination terminal, the base station may obtain reference information corresponding to the CSI measurement result according to the information of the unlicensed frequency band carried in the CSI measurement result, and further obtain a channel condition of a current downlink according to the second reference signal and the CSI measurement result, and select a corresponding transmission scheme to send downlink data to the destination terminal.
Compared with the prior art, the data transmission method provided by the embodiment of the application has the advantages that the base station receives the CSI measurement result through the unauthorized frequency band, and because one-time continuous data transmission on the unauthorized frequency band is limited by the maximum transmission time, the base station is difficult to ensure that the base station can receive the CSI measurement result fed back by the terminal, so that the CSI measurement and CSI measurement result feedback opportunities performed by the local target terminal can be wasted, and the waste of network resources is caused. In the application, because the CSI measurement result is received through the authorized frequency band, and the base station has the absolute use right of the authorized frequency band, the base station can ensure that the CSI measurement result is received, and the data transmission efficiency is improved.
In an application scenario of the embodiment of the present application, when the data transmission method provided in the embodiment of the present application is applied to an L AA system, as shown in fig. 5, the method specifically includes:
401. the base station groups the terminals in the service area and sets a user group identifier for each group.
The specific implementation manner of this step can refer to step 101.
402. The base station performs CCA.
Specifically, since the L AA system works in the unlicensed frequency band, to avoid interference between different systems, the L AA system needs to monitor a channel before transmitting data, perform CCA, detect signal energy and compare the signal energy with a threshold, determine a busy-idle state of the channel according to a comparison result, and transmit data when the channel is ensured to be idle.
403. And after detecting that the channel is idle, the base station sends a reference signal to the first terminal.
The first terminal is any terminal working in the service area of the base station.
Specifically, if the base station detects that the channel is idle, the base station occupies the channel resource. And after occupying the channel resources, transmitting a reference signal to the first terminal by using the unlicensed frequency band.
404. And the first terminal carries out CSI measurement according to the received reference signal.
405. The first terminal sends a CSI measurement result to the base station.
Specifically, since the time consumed by the process from the transmission of the reference signal by the base station to the completion of the CSI measurement by the first terminal is long, in order to ensure that the CSI measurement result transmitted by the first terminal can be successfully received by the base station, the first terminal may transmit the CSI measurement result using the authorized frequency band.
406. And after receiving the CSI measurement result, the base station correspondingly stores the CSI measurement result and the user group identification of the first terminal in a local place, and starts a counter.
The specific implementation manner of this step can refer to steps 201 and 203.
407. And the base station sends downlink data to the first terminal according to the received CSI measurement result.
408. When the base station needs to send downlink data to the second terminal, the base station judges whether the user group identification of the second terminal is the same as the user group identification of the first terminal.
The second terminal is another terminal except the first terminal working in the service area of the base station.
Specifically, when the user group identifier of the second terminal is different from the user group identifier of the first terminal, the base station sends reference information to the second terminal, and requests the second terminal to perform CSI measurement and feed back a CSI measurement result.
409. And when the user group identification of the second terminal is the same as the user group identification of the first terminal, the base station judges whether the CSI measurement result of the first terminal is valid.
Specifically, the base station determines whether the value of the counter exceeds an effective lifetime set for the CSI measurement result of the first terminal, if not, the CSI measurement result is effective, otherwise, the CSI measurement result is invalid.
When the CSI measurement result of the first terminal is invalid, the base station sends a reference signal to the second terminal, the second terminal is required to perform CSI measurement and feed back the CSI measurement result, and the base station sends data to the second terminal according to the received CSI measurement result.
410. And when the CSI measurement result of the first terminal is valid, the base station calls the CSI measurement result of the first terminal to send downlink data to the second terminal.
An embodiment of the present invention further provides a data transmission apparatus 60, as shown in fig. 6, the apparatus includes:
a processing unit 61, configured to obtain a user group identifier of a destination terminal, where terminals in the same group may share the same CSI measurement result; and obtaining an effective CSI measurement result corresponding to the user group identification of the target terminal from the local.
A sending unit 62, configured to send data to the destination terminal according to the effective CSI measurement result obtained by the processing unit 61.
According to the data transmission device, when the base station needs to send data to the target terminal, the effective CSI measurement result in the packet is directly called according to the user group identification, and downlink data are sent to the target terminal. Compared with the prior art, the base station requires the terminal to perform CSI measurement and feed back a CSI measurement result before sending downlink data each time. However, in the unlicensed frequency band, the time consumption of the CSI measurement and feedback process is long, so that the efficiency of the base station transmitting the service data by using the unlicensed frequency band is low. In the method, the base station directly calls the effective CSI measurement result in the same group, so that the time for the terminal to perform CSI measurement and feedback is saved, more service data can be transmitted in the transmittable time, and the efficiency of the base station for transmitting the service data by using the unauthorized frequency band is improved.
Further, the processing unit 61 is further configured to divide the served terminals into at least two groups according to the geographic location of the served terminals of the base station; alternatively, the served terminals are divided into at least two groups according to the path loss between the base station and the served terminals.
Further, an embodiment of the present application also provides a data transmission apparatus 70, as shown in fig. 7, where the apparatus 70 further includes a receiving unit 71 and a storage unit 72.
The sending unit 62 is further configured to send first reference signals to a specified number of terminals in each packet, where the first reference signals are used to instruct the specified number of terminals in each packet to perform CSI measurement.
The receiving unit 71 is configured to receive CSI measurement results fed back by the terminals in each packet respectively.
The storage unit 72 is configured to store each CSI measurement result received by the receiving unit 71 in correspondence with a user group identifier of a terminal that sends each CSI measurement result.
The processing unit 61 is further configured to set, by the base station, the CSI measurement result to be invalid when the existence duration of the CSI measurement result exceeds the valid lifetime limit.
Further, the sending unit 62 is further configured to send a second reference signal to the destination terminal by using an unlicensed frequency band, where the second reference signal is used to instruct the destination terminal to perform CSI measurement.
The receiving unit 71 is further configured to receive a CSI measurement result fed back by the destination terminal from an authorized frequency band.
Further, the processing unit 61 is further configured to start a counter while the storage unit 72 stores the CSI measurement result; the numerical value of the counter is automatically increased by 1 every time a transmission time interval TTI passes; and when the value of the counter exceeds a preset value, setting the CSI measurement result to be invalid.
As shown in fig. 8, an embodiment of the present invention provides a terminal for data transmission, including: a processor 801, a memory 802, a transceiver 803, and a bus 804 by which the processor 801, the memory 802, and the transceiver 803 communicate with each other. The memory 802 is configured to store a plurality of instructions to implement data transmission provided by the present invention, and the processor 801 executes the plurality of instructions to implement that when a base station needs to send data to a destination terminal, the base station acquires a user group identifier of the destination terminal, and the base station locally acquires an effective CSI measurement result corresponding to the user group identifier of the destination terminal; and the base station sends data to the target terminal according to the effective CSI measurement result. Wherein terminals within the same group may share the same CSI measurement results.
Further, the processor 801 is further configured to divide the served terminals into at least two groups by the base station according to the geographic location of the served terminals; or the base station divides the served terminal into at least two groups according to the path loss between the base station and the served terminal.
Further, the processor 801 is further configured to respectively send, by the base station, a first reference signal to a specified number of terminals in each packet, where the first reference signal is used to instruct the specified number of terminals in each packet to perform CSI measurement; the base station receives CSI measurement results fed back by the terminals in each group respectively; when the base station respectively stores each received CSI measurement result and the user group identification of the terminal which sends each CSI measurement result correspondingly; and when the existence duration of the CSI measurement result exceeds the effective survival time limit, the base station sets the CSI measurement result to be invalid.
Further, the processor 801 is further configured to, when the base station does not obtain a valid CSI measurement result, send, by using an unlicensed frequency band, a second reference signal to the destination terminal, where the second reference signal is used to instruct the destination terminal to perform CSI measurement; and the base station receives the CSI measurement result fed back by the target terminal from the authorized frequency band.
Further, the processor 801 is further configured to start a counter while the base station stores the CSI measurement result; the numerical value of the counter is automatically increased by 1 every time a transmission time interval TTI passes; and when the value of the counter exceeds a preset value, the base station sets the CSI measurement result to be invalid.
The processor 801 according to the embodiment of the present invention may be a single processor, or may be a general term for multiple processing elements. For example, the processor 801 may be a Central Processing Unit (CPU), an Application Specific Integrated Circuit (ASIC), or one or more Integrated circuits configured to implement embodiments of the present invention, such as: one or more microprocessors (digital signal processors, DSP for short), or one or more Field programmable gate arrays (FPGA for short).
The memory 802 may be a single storage device or a combination of storage elements, and is used for storing executable program codes and the like. And the memory 802 may include a Random Access Memory (RAM) or a non-volatile memory (non-volatile memory), such as a magnetic disk memory, a Flash memory (Flash), and the like.
The bus 804 may be an Industry Standard Architecture (ISA) bus, a Peripheral Component Interconnect (PCI) bus, an Extended ISA (EISA) bus, or the like. The bus 804 may be divided into an address bus, a data bus, a control bus, etc. For ease of illustration, only one thick line is shown in FIG. 8, but this is not intended to represent only one bus or type of bus.
The embodiments in the present specification are described in a progressive manner, and the same and similar parts among the embodiments are referred to each other, and each embodiment is mainly described in a way different from the other embodiments
To (3). In particular, for the apparatus embodiment, since it is substantially similar to the method embodiment, it is relatively simple to describe, and reference may be made to some descriptions of the method embodiment for relevant points.
It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above can be implemented by a computer program, which can be stored in a computer-readable storage medium, and when executed, can include the processes of the embodiments of the methods described above. The storage medium may be a magnetic disk, an optical disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), or the like.
The above description is only for the specific embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (8)
1. A method of data transmission, comprising:
a base station respectively sends first reference signals to a specified number of terminals in each group, and the first reference signals are used for indicating the specified number of terminals in each group to carry out CSI measurement; determining the specified quantity according to the geographic position of the terminal or the path loss from the base station to the terminal;
the base station receives CSI measurement results fed back by the terminals in each group respectively;
the base station respectively stores each received CSI measurement result and the user group identification of the terminal which sends each CSI measurement result correspondingly;
when the existence duration of the CSI measurement result exceeds the effective survival time limit, the base station sets the CSI measurement result to be invalid;
when a base station needs to send data to a target terminal, the base station acquires a user group identifier of the target terminal, wherein terminals in the same group can share one user group identifier, and terminals with the same user group identifier can share a Channel State Information (CSI) measurement result;
the base station locally acquires an effective CSI measurement result corresponding to the user group identification of the target terminal;
and the base station sends data to the target terminal according to the effective CSI measurement result.
2. The method of claim 1, wherein before the base station acquires the user group identity of the destination terminal, the method further comprises:
the base station divides the served terminals into at least two groups according to the geographical positions of the served terminals; or,
the base station divides the served terminals into at least two groups according to the path loss between the base station and the served terminals.
3. The method according to claim 1, wherein the setting, by the base station, the CSI measurement result to invalid when the existence duration of the CSI measurement result exceeds the valid survival duration specifically includes:
the base station starts a counter while storing the CSI measurement result;
the numerical value of the counter is automatically increased by 1 every time a transmission time interval TTI passes;
and when the value of the counter exceeds a preset value, the base station sets the CSI measurement result to be invalid.
4. The method according to any of claims 1-3, wherein before the base station sends data to the destination terminal according to the valid CSI measurement result, the method further comprises:
when the base station does not obtain a valid CSI measurement result, the base station sends a second reference signal to the target terminal by using an unauthorized frequency band, wherein the second reference signal is used for indicating the target terminal to carry out CSI measurement;
and the base station receives the CSI measurement result fed back by the target terminal from the authorized frequency band.
5. An apparatus for data transmission, comprising:
the processing unit is used for acquiring a user group identifier of a target terminal, wherein the terminals in the same group can share one user group identifier, the terminals with the same user group identifier can share a Channel State Information (CSI) measurement result, and the processing unit is also used for setting the CSI measurement result to be invalid by the base station when the existence duration of the CSI measurement result exceeds the effective survival time limit;
obtaining an effective CSI measurement result corresponding to the user group identification of the target terminal from the local;
a sending unit, configured to send data to the destination terminal according to the valid CSI measurement result obtained by the processing unit, and further configured to send first reference signals to a specified number of terminals in each group, where the first reference signals are used to indicate the specified number of terminals in each group to perform CSI measurement; determining the specified quantity according to the geographic position of the terminal or the path loss from the base station to the terminal;
a receiving unit, configured to receive CSI measurement results fed back by terminals in each group respectively;
and the storage unit is used for correspondingly storing each CSI measurement result received by the receiving unit and the user group identification of the terminal sending each CSI measurement result.
6. The apparatus of claim 5, wherein the processing unit is further configured to divide the served terminals into at least two groups according to the geographic locations of the served terminals of the base station; or,
the served terminals are divided into at least two groups according to the path loss between the base station and the served terminals.
7. The apparatus of claim 5, wherein the processing unit is further configured to start a counter while the storage unit stores the CSI measurement result;
the numerical value of the counter is automatically increased by 1 every time a transmission time interval TTI passes;
and when the value of the counter exceeds a preset value, setting the CSI measurement result to be invalid.
8. The apparatus according to any of claims 5-7, wherein the transmitting unit is further configured to transmit a second reference signal to the destination terminal using an unlicensed frequency band, where the second reference signal is used to instruct the destination terminal to perform CSI measurement;
the receiving unit is further configured to receive a CSI measurement result fed back by the destination terminal from an authorized frequency band.
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