CN109314556B

CN109314556B - Multi-user multi-input multi-output joint scheduling method with interference measurement, base station and user equipment

Info

Publication number: CN109314556B
Application number: CN201680084139.6A
Authority: CN
Inventors: 骆亚铭; 陈翔; 招溢利
Original assignee: TCL Communication Technology Chengdu Ltd
Current assignee: TCL Communication Technology Chengdu Ltd
Priority date: 2016-09-02
Filing date: 2016-09-02
Publication date: 2022-04-08
Anticipated expiration: 2036-09-02
Also published as: WO2018040074A1; CN109314556A

Abstract

The invention discloses a multi-user joint scheduling method which has interference measurement. The method comprises the following steps: transmitting a first reference signal to a user equipment; receiving first channel state information fed back by the user equipment for measuring the first reference signal from the user equipment; sending preliminary joint scheduling information and a second reference signal to user equipment, wherein the preliminary joint scheduling information comprises an identifier of at least one joint scheduling object, the joint scheduling object uses the same time-frequency resource as the user equipment in space division multiplexing during data transmission, and the preliminary joint scheduling information is obtained based on first channel state information; receiving, from the ue, second channel state information fed back by the ue at least by measuring a second reference signal according to the preliminary joint scheduling information, where the second channel state information includes an indication of interference from at least one joint scheduling object; and adjusting the preliminary joint scheduling information according to the second channel state information to obtain improved joint scheduling information. The method may be applied to full-dimensional multiple-input multiple-output. The invention also discloses a relevant base station and user equipment.

Description

Multi-user multi-input multi-output joint scheduling method with interference measurement, base station and user equipment

Technical Field

Embodiments of the present invention relate generally to communications, and more particularly, to a method, a base station, and a User Equipment (UE) for multiuser joint scheduling.

Background

multiple-Input-multiple-Output (MIMO) is a method of multiplying the capacity of a radio link using multiple transmit antennas and multiple receive antennas.

MIMO supports Single-User MIMO (SU-MIMO) and multi-User MIMO (MU-MIMO). In SU-MIMO, a Spatial Multiplexing (SM) data stream is scheduled to a single user to improve the transmission rate and spectral efficiency of the user. In MU-MIMO, the data stream of space division multiplexing is scheduled to multiple users, which share the same time-frequency resource through space division multiplexing in data transmission, so the system can obtain additional multi-user diversity gain through multi-user scheduling in spatial dimension. Since multiple UEs use the same time-frequency resource through SM. This requires the base station/enodeb (enb) to use multiple transmit antennas to distinguish between two or more transmissions. In addition, MU-MIMO generally requires more accurate Channel State Information (CSI) feedback.

The UE may measure a downlink Reference Signal (RS) from the base station to obtain CSI and report it to the eNodeB. The eNB may schedule the UE and precode data signals based on CSI feedback. In MU-MIMO, interference should be further included in the CSI information, which requires the UE to know the object that is scheduled jointly with itself (i.e., the object that uses the same time-frequency resource as the UE through SM), which in turn makes it difficult to acquire accurate CSI information.

If the result of the joint scheduling is not determined by the base station, the UE may report all possible joint scheduling situations or autonomously decide about its own joint scheduling. For the first case, the overhead of the obtained measurement report may be large, while for the second case, since the UE cannot directly know the CSI information obtained by other UEs, the decisions made by different UEs may collide. On the other hand, if the base station determines a joint scheduling object when transmitting a downlink RS and informs the UE of related information, the decided joint scheduling object may be inappropriate because the base station has not received any CSI information. For example, there is severe interference between the UE and some joint scheduling objects. In both cases, accurate UE scheduling may be poor, thereby affecting system performance in subsequent data transmissions.

Disclosure of Invention

The embodiment of the invention provides a multi-user joint scheduling method, a base station and user equipment, which can solve the problem that accurate CSI information is difficult to obtain in MU-MIMO in the prior art.

The invention provides a multi-user joint scheduling method, which comprises the following steps: transmitting a first reference signal to a user equipment; receiving first channel state information fed back by the user equipment for measuring the first reference signal from the user equipment; sending preliminary joint scheduling information and a second reference signal to user equipment, wherein the preliminary joint scheduling information comprises an identifier of at least one joint scheduling object, the joint scheduling object uses the same time-frequency resource as the user equipment in space division multiplexing during data transmission, and the preliminary joint scheduling information is obtained based on first channel state information; receiving, from the ue, second channel state information fed back by the ue at least by measuring a second reference signal according to the preliminary joint scheduling information, where the second channel state information includes an indication of interference from at least one joint scheduling object; and adjusting the preliminary joint scheduling information according to the second channel state information to obtain improved joint scheduling information.

Adjusting the preliminary joint scheduling information according to the second channel state information may include: and removing the identifier of at least one preliminary joint scheduling object in the second channel state information from the preliminary joint scheduling information, wherein the total interference size between the at least one joint scheduling object and the user equipment is not in a preset range.

Adjusting the preliminary joint scheduling information according to the second channel state information may further include: and adding an identifier of at least one joint scheduling object to the preliminary joint scheduling information, wherein the total interference between the at least one joint scheduling object and the user equipment is within a preset range and is not in the preliminary joint scheduling information.

The indication of the interference magnitude may comprise a preliminary multi-user channel quality indicator.

The second channel state information may further include joint scheduling object adjustment recommendation information. Adjusting the preliminary joint scheduling information according to the second channel state information may include: and adjusting the suggestion information according to the joint scheduling object, adding the identifications of the plurality of joint scheduling objects to the preliminary joint scheduling information, or removing the identifications of the plurality of joint scheduling objects from the preliminary joint scheduling information.

The method may further comprise: receiving aperiodic joint scheduling object adjustment suggestion information from user equipment; and adjusting the suggestion information according to the joint scheduling object, adding the identifications of the plurality of joint scheduling objects to the preliminary joint scheduling information, or removing the identifications of the plurality of joint scheduling objects from the preliminary joint scheduling information to obtain improved joint scheduling information.

The method may further comprise: before receiving the aperiodic joint scheduling object adjustment suggestion information, sending a message to the user equipment to signal the user equipment to report the aperiodic joint scheduling object adjustment suggestion information.

The method may further comprise: transmitting data according to the improved joint scheduling information or the preliminary joint scheduling information, wherein the improved joint scheduling information is used for data transmission of a next cycle in a case where the data is transmitted based on the preliminary joint scheduling information.

The method may further comprise: and sending a message to the user equipment to inform the user equipment whether the current periodic data transmission uses the improved joint scheduling information or the preliminary joint scheduling information.

The method may further comprise: and sending a preset range to the user equipment, wherein the preset range is represented by at least one threshold value on one end, and the threshold value is an absolute threshold value or a relative threshold value.

The second reference signal may be different from the first reference signal, and the second reference signal may be generated based on the first channel state information.

The second reference signal may be carried by at least two beams formed by beamforming, wherein a port virtualization matrix of a plurality of mapping matrices used for beamforming of at least one beam is the same as precoding matrix information in the first channel state information.

The second reference signal may be used as a second reference signal for a next period, wherein the first reference signal for the next period is omitted, and the preliminary joint scheduling information is determined based on second channel state information/aperiodic joint scheduling object adjustment suggestion information of one or more periods before the next period.

The preliminary joint scheduling information may further include beam information selected for the user equipment; and/or the second channel state information comprises beam information selected by the user equipment.

Each joint scheduling object may be a beam.

Different beams may correspond to different time-frequency resources.

The identifier of each joint scheduling object may include a plurality of parameters of the time-frequency resource corresponding to the joint scheduling object.

The preliminary joint scheduling information is carried by a CSI-RS-Config message or a CSI-IM-Config message.

The invention also provides a multi-user joint scheduling method, which comprises the following steps: the user equipment measures a first reference signal from a base station to generate first channel state information; the user equipment sends first channel state information to a base station; the user equipment receives preliminary joint scheduling information from the base station, wherein the preliminary joint scheduling information comprises an identifier of at least one joint scheduling object, the joint scheduling object uses the same time-frequency resource as the user equipment in space division multiplexing in data transmission, and the preliminary joint scheduling information is obtained based on first channel state information; the user equipment measures a second reference signal from the base station at least according to the preliminary joint scheduling information to generate second channel state information, wherein the second channel state information comprises an indication of interference from at least one joint scheduling object; and the user equipment sends the second channel state information to the base station, so that the base station adjusts the preliminary joint scheduling information according to the second channel state information to obtain improved joint scheduling information.

The indication of the interference size may comprise a preliminary MU-CQI.

The indication of the interference magnitude may further comprise an improved MU-CQI or a delta CQI. The second channel state information may further include joint scheduling object adjustment suggestion information including information suggesting removal of at least one joint scheduling object whose total interference size with the user equipment is not within a preset range, and/or information suggesting addition of at least one joint scheduling object whose total interference size with the user equipment is within a preset range and is not in the preliminary joint scheduling information.

Transmitting the second channel state information to the base station may include: and removing repeated parts of a plurality of parameters corresponding to the preliminary MU-CQI and the improved MU-CQI from the second CSI at a time, and sending the simplified second channel state information to the base station.

The method may further comprise: and sending aperiodic joint scheduling object adjustment suggestion information to the base station, wherein the joint scheduling object adjustment suggestion information comprises information suggesting that at least one joint scheduling object with the total interference size of the user equipment is not within a preset range is removed, and/or information suggesting that at least one joint scheduling object with the total interference size of the user equipment is not within the preset range and is not in the preliminary joint scheduling information is added.

The method may further comprise: before sending the aperiodic joint scheduling object adjustment suggestion information, receiving a message from the base station, the message signaling the user equipment to report the aperiodic joint scheduling object adjustment suggestion information.

The method may further comprise: and receiving a preset range from the base station, wherein the preset range is represented by a threshold value at least one end, and the threshold value is an absolute threshold value or a relative threshold value.

The method may further comprise: before sending the second channel state information to the base station, receiving a message from the base station, wherein the message informs the user equipment whether the data transmission of the current period uses the improved joint scheduling information or the preliminary joint scheduling information; and adjusting the second channel state information based on the message.

The preliminary joint scheduling information may be carried by a CSI-RS-Config message or a CSI-IM-Config message.

The second reference signal may be carried by at least two beams formed by beamforming, the preliminary joint scheduling information further includes beam information selected for the user equipment, and the second channel state information further includes beam information selected by the user equipment itself.

The present invention also provides a base station, comprising: a first sending module, configured to send a first reference signal to a user equipment; the first receiving module is used for receiving first channel state information fed back by the user equipment by measuring the first reference signal from the user equipment; a second sending module, configured to send preliminary joint scheduling information and a second reference signal to the ue, where the preliminary joint scheduling information includes an identifier of at least one joint scheduling object, the joint scheduling object uses time-frequency resources that are the same as those used by the ue in space division multiplexing during data transmission, and the preliminary joint scheduling information is obtained based on the first channel state information; a second receiving module, configured to receive, from the ue, second channel state information fed back by the ue by measuring a second reference signal at least according to the preliminary joint scheduling information, where the second channel state information includes an indication of interference from at least one joint scheduling object; and the adjusting module is used for adjusting the preliminary joint scheduling information according to the second channel state information so as to obtain improved joint scheduling information.

The adjusting module may be configured to remove, from the preliminary joint scheduling information, an identifier of at least one preliminary joint scheduling object in the second channel state information, where a total interference size between the at least one joint scheduling object and the user equipment is not within a preset range.

The adjusting module may be further configured to add an identifier of at least one joint scheduling object to the preliminary joint scheduling information, where a total interference size between the at least one joint scheduling object and the ue is within a preset range and is not in the preliminary joint scheduling information.

The indication of the interference size includes a preliminary MU-CQI and an improved MU-CQI or delta CQI. The second channel state information may further include joint scheduling object adjustment recommendation information. The adjustment module may be configured to adjust the proposed information according to the joint scheduling object, add the identifiers of the multiple joint scheduling objects to the preliminary joint scheduling information, or remove the identifiers of the multiple joint scheduling objects from the preliminary joint scheduling information.

The second reference signal may be different from the first reference signal, the second reference signal may be carried by at least two beams formed by beamforming, and a port virtualization matrix of a plurality of mapping matrices used for beamforming of at least one beam may be the same as precoding matrix information in the first channel state information.

The present invention also provides a user equipment, comprising: a first measurement module, configured to measure a first reference signal from a base station to generate first channel state information; a first sending module, configured to send first channel state information to a base station; a first receiving module, configured to receive preliminary joint scheduling information from a base station, where the preliminary joint scheduling information includes an identifier of at least one joint scheduling object, the joint scheduling object uses time-frequency resources that are the same as those used by a user equipment in space division multiplexing during data transmission, and the preliminary joint scheduling information is obtained based on first channel state information; a second measurement module, configured to measure a second reference signal from the base station at least according to the preliminary joint scheduling information to generate second channel state information, where the second channel state information includes an indication of interference from at least one joint scheduling object; and the second sending module is used for sending the second channel state information to the base station so that the base station adjusts the preliminary joint scheduling information according to the second channel state information to obtain improved joint scheduling information.

The indication of the interference size includes a preliminary MU-CQI and an improved MU-CQI or delta CQI. The second channel state information may further include joint scheduling object adjustment suggestion information, which may include information suggesting removal of at least one joint scheduling object whose total interference size with the user equipment is not within a preset range and/or information suggesting addition of at least one joint scheduling object whose total interference size with the user equipment is within a preset range and is not in the preliminary joint scheduling information.

The second transmitting module may be configured to remove the preliminary MU-CQI and the repeated portion of the plurality of parameters corresponding to the improved MU-CQI from the second CSI at a time and transmit the reduced second CSI to the base station.

The user equipment further comprises: and a third sending module, configured to send aperiodic joint scheduling object adjustment recommendation information to the base station, where the joint scheduling object adjustment recommendation information includes information that recommends to remove at least one joint scheduling object whose total interference with the user equipment is not within a preset range, and/or information that recommends to add at least one joint scheduling object whose total interference with the user equipment is not within the preset range and is not in the preliminary joint scheduling information.

The invention also provides a base station which comprises a processor and a transceiver, wherein the processor is connected with the transceiver. The processor may be configured to: transmitting, by a transceiver, a first reference signal to a user equipment; receiving, by a transceiver from a user equipment, first channel state information fed back by the user equipment measuring a first reference signal; transmitting preliminary joint scheduling information and a second reference signal to user equipment through a transceiver, wherein the preliminary joint scheduling information comprises an identifier of at least one joint scheduling object, the joint scheduling object uses the same time-frequency resource as the user equipment in data transmission by space division multiplexing, and the preliminary joint scheduling information is obtained based on first channel state information; receiving, by the transceiver from the user equipment, second channel state information fed back by the user equipment by measuring at least a second reference signal according to the preliminary joint scheduling information, the second channel state information including an indication of an interference level from at least one joint scheduling object; and adjusting the preliminary joint scheduling information according to the second channel state information to obtain improved joint scheduling information.

The processor may be configured to remove, from the preliminary joint scheduling information, an identification of at least one preliminary joint scheduling object in the second channel state information, where a total interference level between the at least one joint scheduling object and the user equipment is not within a preset range.

The processor may be further configured to add an identifier of at least one joint scheduling object to the preliminary joint scheduling information, where a total interference size between the at least one joint scheduling object and the ue is within a preset range and is not in the preliminary joint scheduling information.

The indication of the interference magnitude may further comprise an improved MU-CQI or a delta CQI. The second channel state information may further include joint scheduling object adjustment recommendation information. The processor may be configured to adjust the proposed information according to the joint scheduling object, add the identifiers of the plurality of joint scheduling objects to the preliminary joint scheduling information, or remove the identifiers of the plurality of joint scheduling objects from the preliminary joint scheduling information.

The processor may be further configured to: receiving, by a transceiver, aperiodic joint scheduling object adjustment recommendation information from a user equipment; and adjusting the suggestion information according to the joint scheduling object, adding the identifications of the plurality of joint scheduling objects to the preliminary joint scheduling information, or removing the identifications of the plurality of joint scheduling objects from the preliminary joint scheduling information to obtain improved joint scheduling information.

The processor may be further configured to: receiving, by the transceiver, a message to the user equipment to signal the user equipment to report the aperiodic joint scheduling object adjustment suggestion information before receiving the aperiodic joint scheduling object adjustment suggestion information by the transceiver.

The processor may be further configured to: transmitting data according to the improved joint scheduling information or the preliminary joint scheduling information, wherein the improved joint scheduling information is used for data transmission of a next cycle in a case where the data is transmitted based on the preliminary joint scheduling information.

The processor may be further configured to: and sending a message to the user equipment through the transceiver to inform the user equipment whether the current periodic data transmission uses the improved joint scheduling information or the preliminary joint scheduling information.

The processor may be further configured to: transmitting, by the transceiver, a preset range to the user equipment, wherein the preset range is represented by a threshold at least one end, the threshold being an absolute threshold or a relative threshold.

The second reference signal may be used as a second reference signal for a next period, wherein the first reference signal for the next period is omitted, and the preliminary joint scheduling information is determined based on second CSI/aperiodic joint scheduling object adjustment recommendation information for one or more periods before the next period.

Each joint scheduling object may be a beam.

Different beams may correspond to different time-frequency resources.

The invention also provides user equipment which comprises a processor and a communication circuit, wherein the communication circuit is connected with the processor. The processor may be configured to: measuring, by the communication circuitry, a first reference signal from the base station to generate first channel state information; transmitting first channel state information to a base station over a communication circuit; receiving preliminary joint scheduling information from a base station through a communication circuit, wherein the preliminary joint scheduling information comprises an identifier of at least one joint scheduling object, the joint scheduling object uses the same time-frequency resource as user equipment in data transmission by space division multiplexing, and the preliminary joint scheduling information is obtained based on first channel state information; measuring, by a communication circuit, a second reference signal from the base station according to at least the preliminary joint scheduling information to generate second channel state information, the second channel state information including an indication of an amount of interference from at least one joint scheduling object; and sending the second channel state information to the base station through the communication circuit, so that the base station adjusts the preliminary joint scheduling information according to the second channel state information to obtain improved joint scheduling information.

The indication of the interference size may comprise a preliminary MU-CQI.

The indication of the interference magnitude may further comprise an improved MU-CQI or a delta CQI. The second channel state information further includes joint scheduling object adjustment suggestion information, the joint scheduling object adjustment suggestion information including information suggesting to remove at least one joint scheduling object whose total interference size with the user equipment is not within a preset range, and/or information suggesting to add at least one joint scheduling object whose total interference size with the user equipment is within a preset range and is not in the preliminary joint scheduling information.

The processor may be configured to include: the repeated portions of the plurality of parameters corresponding to the preliminary MU-CQI and the improved MU-CQI are removed from the second CSI at a time and the reduced second CSI is sent to the base station via the communication circuit.

The processor may be further configured to: and sending aperiodic joint scheduling object adjustment suggestion information to the base station through the communication circuit, wherein the joint scheduling object adjustment suggestion information comprises information suggesting to remove at least one joint scheduling object of which the total interference size with the user equipment is not in a preset range, and/or information suggesting to add at least one joint scheduling object of which the total interference size with the user equipment is in the preset range and is not in the preliminary joint scheduling information.

The processor may be further configured to: before the aperiodic joint scheduling object adjustment suggestion information is sent by the communication circuit, a message is received from the base station, the message signals the user equipment to report the aperiodic joint scheduling object adjustment suggestion information.

The processor may be further configured to: receiving a preset range from the base station through the communication circuit, wherein the preset range is represented by a threshold value at least one end, and the threshold value is an absolute threshold value or a relative threshold value.

The processor may be further configured to: before sending the second CSI to the base station through the communication circuit, receiving a message from the base station, wherein the message informs the user equipment whether the data transmission of the current period uses the improved joint scheduling information or the preliminary joint scheduling information; and adjusting the second CSI based on the message.

The invention has the beneficial effects that: by transmitting the reference signal twice to the user equipment. The user equipment can measure the first reference signal and the first channel state information feedback, and the base station can perform preliminary scheduling based on the first reference signal and the first channel state information feedback and send the preliminary scheduling information and the second reference signal to the user equipment. The user equipment may measure the second reference signal at least according to the preliminary scheduling information to generate second channel state information, and transmit the second channel state information to the base station. The base station then further adjusts the preliminary scheduling according to the second channel state information to obtain an improved scheduling. Compared with the prior art, the UE scheduling is determined by the base station in a centralized way, and the conflict possibly brought by the self-determination of the UE is avoided. In addition, the channel state information fed back after the UE measures is utilized in the decision process, so that the scheduling accuracy is improved, and the system performance is improved.

Drawings

Fig. 1 is a flowchart of a first embodiment of a multi-user joint scheduling method according to the present invention.

Fig. 2 is a flowchart of a second embodiment of the multi-user joint scheduling method according to the present invention.

Fig. 3 is a flowchart of a third embodiment of the multi-user joint scheduling method according to the present invention.

Fig. 4 is a flowchart of a fourth embodiment of the multi-user joint scheduling method according to the present invention.

Fig. 5 is a schematic diagram of beamforming for downlink data signals in Full Dimension (FD-MIMO).

Fig. 6 is a diagram of a base station transmitting non-precoded CSI-RS to a plurality of UEs in an example of the fourth embodiment of the multi-user joint scheduling method.

Fig. 7 is a diagram of grouping a plurality of UEs by a base station in an example of the fourth embodiment of the multi-user joint scheduling method.

Fig. 8 is a schematic diagram of improved joint scheduling in an example of the fourth embodiment of the multi-user joint scheduling method.

Fig. 9 is a simulation example of the fourth embodiment of the multi-user joint scheduling method.

Fig. 10 is another simulation example of the fourth embodiment of the multi-user joint scheduling method.

Fig. 11 is another simulation example of the fourth embodiment of the multi-user joint scheduling method.

Fig. 12 is yet another simulation example of the fourth embodiment of the multi-user joint scheduling method.

Fig. 13 is yet another simulation example of the fourth embodiment of the multi-user joint scheduling method.

Fig. 14 is a flowchart of a fifth embodiment of the multi-user joint scheduling method according to the present invention.

Fig. 15 is a flowchart of a sixth embodiment of the multi-user joint scheduling method according to the present invention.

Fig. 16 is a schematic structural diagram of a first embodiment of a base station according to the present invention.

Fig. 17 is a schematic structural diagram of a second embodiment of a base station according to the present invention.

Fig. 18 is a schematic structural diagram of a first embodiment of a user equipment according to the present invention.

Fig. 19 is a schematic structural diagram of a second embodiment of a user equipment according to the present invention.

Fig. 20 is a schematic structural diagram of a third embodiment of a user equipment according to the present invention.

The present invention includes references to "one embodiment," a particular embodiment, "" some embodiments, "" different embodiments, "or" embodiments. The appearances of the phrase "one embodiment," "a particular embodiment," "some embodiments," "different embodiments," or "an embodiment" are not necessarily referring to the same embodiment. The particular features, structures or characteristics may be combined in a manner consistent with the invention.

Various modules, units, circuits, or other components may be described or claimed as being "configured to" perform a task or tasks. In these contexts, "configured to" is used to connote structure by indicating that the module/unit/circuit/component includes structure (e.g., circuitry) that performs these one or more tasks during operation. Thus, a module/unit/circuit/component may be said to be configured to perform a task even when the particular module/unit/circuit/component is currently inoperable (e.g., not in an on state). A module/unit/circuit/component for use with the "configured to" language includes hardware-e.g., circuitry, memory storing program instructions executable to perform operations, and so on. For a module/unit/circuit/component, it is expressly not intended that the module/unit/circuit/component "configured to" perform one or more tasks cite 35u.s.c. § 112 (f). Additionally, "configured to" may include a general-purpose structure (e.g., a general-purpose circuit) that is packaged by software and/or firmware (e.g., an FPGA or a general-purpose processor executing software) to operate in a manner that enables performance of the task in question. "configured to" may also include adapting a process flow (e.g., a semiconductor fabrication facility) to a fabrication facility (e.g., an integrated circuit) for performing or carrying out one or more tasks.

As used herein, the term "based on" describes one or more factors that affect the judgment. The term does not exclude additional factors that may influence the determination. That is, the determination may be based solely on these factors or at least in part on these factors. Consider the phrase "judge A based on B". When in this case, B is a factor that affects the judgment of a, such a phrase does not exclude that a is also judged based on C. In other cases, a may be judged based on B alone.

Detailed Description

Fig. 1 depicts a flow chart of a first embodiment of a multi-user joint scheduling method according to the present invention. The method may be performed by a base station. A base station may be connected to a core network and in wireless communication with a plurality of user equipment to provide communication coverage for a corresponding geographic area. The base stations may include, but are not limited to, macro, micro, or pico (pico) base stations. In different embodiments, a base station may also be referred to alternatively as a radio base station, access point, node B, evolved node B (eNodeB, eNB), and so on. The method is shown as sequential for illustrative purposes. However, portions of the method may be performed in other orders or in parallel (e.g., simultaneously). The method may include the following steps.

In S11, the method may include transmitting a first reference signal to the user equipment.

The first Reference Signal may be a Cell-specific Reference Signal (CRS) or a Channel State Information Reference Signal (CSI-RS).

In S12, the method may include receiving feedback of the first CSI from the user equipment when the user equipment measures the first reference signal.

The first channel state information may include at least a Precoding Matrix Indicator (PMI), which is a Precoding Matrix that the user equipment suggests the base station to use in downlink transmission. The precoding matrix is used to map the layers to the antenna ports. The precoding technique can appropriately weight the antennas according to the channel conditions to optimize the spatial distribution characteristics of the signal. The precoding matrix can reflect the weighting process on the antennas. The PMI may be codebook based (codebook) or may not be codebook based.

The first Channel state information may further include an order Indicator (RI), a Channel Quality Indicator (CQI), and the like, in addition to the PMI. The RI denotes a number (or order) of transmission layers or a spatial layer that the user equipment suggests the base station to use in downlink transmission. The CQI represents the downlink channel quality, and the base station may select a code rate for data transmission based on the CQI. It should be noted that the CQI in the first Channel state information generally does not consider interference, and is a Single User-Channel Quality Indicator (SU-CQI). Since the user equipment does not consider interference from other user equipments within the same cell during the calculation of the CQI included in the first CSI, the CQI may not accurately reflect the channel quality in the MU-MIMO environment, the base station will not select a code rate for the corresponding data transmission according to the CQI included in the first CSI, and the CQI in the first CSI may be ignored.

At S13, the method includes transmitting preliminary joint scheduling information and a second reference signal to the user equipment.

The preliminary joint scheduling information may include an identifier of at least one joint scheduling object, and the joint scheduling object may use the same time-frequency resources as the user equipment in a space-division multiplexing manner. The preliminary joint scheduling information may be derived based on the first channel state information. A joint scheduling object may be a specific UE, or a group of UEs.

In general, different UEs that select the same PMI are highly likely to have the same or similar channel conditions. For example, the locations of different UEs may overlap, and the interference between these UEs is severe and therefore not suitable for being jointly scheduled. In this way, when the base station performs the preliminary joint scheduling of the UE, the base station will not select a different UE that has selected the same PMI as a joint scheduling object of the UE.

The base station may transmit the preliminary joint scheduling information and the second reference signal simultaneously or separately. Since the ue may need to measure the second reference signal according to the preliminary joint scheduling information, the base station should transmit the preliminary joint scheduling information no later than the transmission of the second reference signal.

At S14, the method includes receiving second channel state information feedback from the user equipment when the user equipment measures for the second reference signal at least according to the preliminary joint scheduling information.

The second channel state information may include an indication of an interference magnitude with the at least one joint scheduling object. The indication may include a multi-User-Channel Quality Indicator (MU-CQI). The MU-CQI calculated by the user equipment based on the preliminary joint scheduling information-preliminary MU-CQI may reflect interference with all joint scheduling objects in the preliminary joint scheduling information.

In a particular embodiment, the indication of the interference magnitude may also include a refined (refined) MU-CQI or a delta CQI (delta CQI), where delta CQI is the difference between the preliminary MU-CQI and the refined MU-CQ. The second CSI may further include scheduled object adjustment suggestion information.

The user equipment may modify the preliminary joint scheduling information such that the calculated MU-CQI based on the modified joint scheduling information is within a preset range, if the preliminary MU-CQI exceeds the preset range. How to modify the preliminary joint scheduling information may be expressed by the joint scheduling object adjustment suggestion information, and the MU-CQI calculated based on the modified joint scheduling information may be referred to as an improved MU-CQI.

The joint scheduling object adjustment suggestion information includes suggestion to remove at least one joint scheduling object including a total interference size with the user equipment not within a preset range and/or suggestion to add at least one joint scheduling object including a total interference size with the user equipment within a preset range and not in the preliminary joint scheduling information.

The total interference size is not within the preset range to indicate that the interference between the object and the UE is too large, so that it is not suitable for being jointly scheduled. Conversely, the total interference size is within the preset range, which indicates that the object and the UE are suitable to be jointly scheduled.

In other embodiments, the indications of interference size may reflect interference from different joint scheduling objects, respectively, and the ue may compare the interference size indication of each joint scheduling object with a preset range, respectively, to obtain the joint scheduling object adjustment suggestion information.

The preset range may be fixed, or may be determined by the base station or the UE according to actual circumstances. If the base station determines the preset range, the base station needs to send the preset range to the UE before the step is executed. Generally, the preset range is represented by a threshold value on at least one side thereof. The threshold may be an absolute threshold and the indication of the corresponding interference magnitude is a MU-CQI or a modified MU-CQI. Alternatively, the threshold may be a relative threshold, and the corresponding indication is Δ CQI. The step of sending the threshold value is only required to be executed before the step, and the sequence between the step and other steps is not limited. For example, the preset range may be sent to the UE during UE access. The base station may choose to notify the UE only when the preset range changes to update the preset range, and not send the preset range at other times.

S15: and adjusting the preliminary joint scheduling information according to the second channel state information to obtain improved joint scheduling information.

The specific algorithm for obtaining the improved joint scheduling information may depend on actual needs. In general, when the indication of the interference size comprises a preliminary MU-CQI, the adjusting comprises at least removing from the preliminary joint scheduling information an identification of at least one preliminary joint scheduling object in the second channel state information for which a total interference size with the user equipment is not within a preset range. If the second channel state information further includes an indication of total interference between the UE and at least one object not in the preliminary joint scheduling information, the adjusting may further include increasing an object whose total interference with the user equipment is within a preset range and not in the preliminary joint scheduling information.

In other embodiments, the indication of the interference magnitude may reflect interference from different joint scheduling objects, respectively, and the base station may compare the indication of the interference magnitude of each joint scheduling object with a preset range, respectively, to adjust the preliminary joint scheduling information.

If the second channel state information further includes joint scheduling object adjustment suggestion information, the base station may accept the suggestion of the UE, and adjust the identifier of the joint scheduling object in the preliminary joint scheduling information according to the joint scheduling object adjustment suggestion information. Of course, the base station may also choose not to accept the UE's recommendation and adjust the preliminary joint scheduling information by itself, for example, when the recommendations of different UEs conflict.

The base station may select a code rate for the corresponding data transmission based on the CQI. If the base station accepts the joint scheduling object adjustment proposal of the user equipment, it may select a code rate based on the improved MU-CQI, wherein the improved MU-CQI may be included in the second CSI, or may be calculated based on the preliminary MU-CQI and the delta CQI included in the second CQI. Otherwise, if the base station does not accept the joint scheduling object adjustment proposal of the user equipment, it may directly use the preliminary MU-CQI included in the second CSI to select the code rate.

It should be noted that after the completion of the joint scheduling, the next joint scheduling may start a loop again, in which steps S11-S15 are performed. Alternatively, the improved joint scheduling information obtained by the joint scheduling of this time may be used as the preliminary joint scheduling information of the next joint scheduling, that is, steps S11 and S12 are skipped and steps S13 to S15 are directly performed.

According to the present embodiment, the base station may transmit the reference signal to the user equipment twice. The user equipment may measure the first reference signal and the first CSI feedback, and the base station may perform preliminary scheduling based on the first reference signal and the first CSI feedback, and transmit preliminary scheduling information and a second reference signal to the user equipment. And the user equipment measures the second RS at least according to the preliminary scheduling information to generate second CSI and sends the second CSI to the base station. The base station may then adjust the preliminary scheduling based on the second CSI to obtain improved joint scheduling information. Compared with the prior art, the scheduling of the user equipment is determined by the base station in a centralized way, so that the possible conflict caused by the self-determination of different UEs is avoided. Meanwhile, the channel state information fed back after the UE measurement is utilized in the decision process, and the scheduling accuracy is improved, so that the system performance is improved.

Fig. 2 is a flowchart of a second embodiment of the multi-user joint scheduling method according to the present invention, which is based on the first embodiment of the joint scheduling method of the present invention, and further includes the following steps.

At S16, the method includes sending a message (signaling) to the user equipment to signal (signal) the user equipment to report the aperiodic joint scheduling object adjustment recommendation information.

In other embodiments, step S16 may be omitted if the user equipment transmits the joint scheduling object adjustment information by itself, instead of in response to a message from the base station.

At S17, the method includes receiving aperiodic, joint scheduling object adjustment suggestion information from the user equipment.

In general, a time interval between two adjacent transmissions of the user equipment aperiodic joint scheduling object adjustment proposal information may be greater than a period for transmitting the second CSI. In this case, the second CSI may not generally include the joint scheduling object adjustment recommendation information in order to reduce a transmission frequency and an uplink signaling overhead of the joint scheduling object adjustment recommendation information.

At S18, the method includes adjusting the identity of the joint scheduling object in the preliminary joint scheduling information according to the joint scheduling object adjustment suggestion information.

The base station can receive the suggestion of the user equipment and adjust the identification of the joint scheduling object in the preliminary joint scheduling information according to the joint scheduling object adjustment suggestion information. However, in other embodiments, the base station may choose not to accept the recommendation and may adjust the preliminary joint scheduling information itself.

It should be noted that, if the base station has already adjusted the preliminary joint scheduling information according to the second channel state information when receiving the joint scheduling object adjustment suggestion information, the base station may further adjust according to the joint scheduling object adjustment suggestion information, or may choose to ignore the received joint scheduling object adjustment suggestion information.

Fig. 3 is a flow chart of a third embodiment of the multi-user joint scheduling method according to the present invention, which is based on the first embodiment of the joint scheduling method of the present invention, and further includes the following steps.

At S19, the method includes transmitting data according to the improved joint scheduling information or the preliminary joint scheduling information.

The base station can send data according to the improved joint scheduling information in the downlink data transmission; the data may also be sent according to the improved joint scheduling information in the next downlink data transmission, and the preliminary joint scheduling information is still used in the current downlink data transmission, at this time, the improved joint scheduling information will be used as the preliminary joint scheduling information in the next joint scheduling process, and the steps of sending the first reference signal and receiving the first channel state information may be omitted.

Fig. 4 is a flowchart of a fourth embodiment of the multi-user joint scheduling method according to the present invention, which is based on the first embodiment of the joint scheduling method and is applied to Full-dimensional (FD-MIMO) and the first reference signal is different from the second reference signal.

FD-MIMO is configured with a two-dimensional antenna array (comprising a single column of crossed poles) with more than 8 transmit units (TXRUs) per transmission point. The TXRU is only associated with antenna elements having the same polarization and has independent amplitude and phase control itself.

This embodiment is a further extension of the first embodiment of the joint scheduling method, and therefore, the same parts as those of the first embodiment of the joint scheduling method of the present invention are not described herein again. The method may include the following steps.

In S110, the base station may transmit a preset range to the user equipment.

As shown in fig. 4, this step S110 may be performed before step S111. In fact, this step may be performed at any time before step S117. If the base station has transmitted the preset range to the user equipment in the previous period but has not adjusted the preset range, this step can be omitted.

In S111, the base station transmits a first reference signal to the user equipment.

The first reference signal may be a CRS or a CSI-RS. If the first reference signal is a CSI-RS, it may be a non-precoded CSI-RS or a beamformed CSI-RS.

As shown in fig. 5, in FD-MIMO, the total beamforming of downlink data signals includes three stages: w_data＝W_TW_PW_UWherein W is_dataMapping matrix, W, for use in beamforming of data signals_UData precoding matrix used for mapping from data stream to antenna port, W_PPort virtualization matrix, W, used for mapping from antenna ports to TXRU_TThe TXRU virtualization matrix used to map antenna elements from TXRUs. N in the figure_sIs the number of data streams, N_APNumber of antenna ports, N_UIs the number of TXRU, N_rIs the number of antenna elements, and N_s≤N_AP≤N_U≤N_r。

By comparison, beamforming of CSI-RS only includes the following two stages: w_CSI-RS＝W_TW_P，W_CSI-RSMapping matrix, W, used for CSI-RS beamforming_PPort virtualization matrix, W, used for mapping from antenna ports to TXRU_TThe TXRU virtualization matrix used to map antenna elements from TXRUs. In other words, the data precoding matrix, W_UOnly for the data signal and not included in the reference signal.

Based on port virtualization, CSI-RS can be classified into two strategies: the non-precoded CSI-RS and the beamformed CSI-RS are referred to as class A and class B, respectively. The first strategy may include a scheme in which different CSI-RSs have the same size beam width and direction, and thus have wider coverage of a cell. Typically, a one-to-one mapping between ports and TXRUs is employed in port virtualization. On the other hand, the second strategy may include a scheme (at least at a specific time/frequency) in which the CSI-RS ports have narrower beamwidths, and thus no wider coverage of the cell. In addition, at least some CSI-RS port resource combinations have different beam directions, at least from the perspective of the base station.

A beamformed CSI-RS configuration may be supported as follows:

class B with multiple CSI-RS resources (K > 1): the beams are distinguished in the level of CSI-RS resources, the same beam being used in the same CSI-RS resource, different beams being used in different CSI-RS resources. Note that K refers to the number of CSI-RS resources that have been configured.

Class B with one CSI-RS resource (K ═ 1): beams are distinguished in the port level, the same beam is used in the same group of configured CSI-RS resources, and different beams may be used in different port groups.

In S112, the user equipment may perform measurement on the first reference signal to generate first channel state information.

The first channel state information may include at least PMI, i.e., W suggested to be used by the user equipment_U。

In S113, the user equipment transmits first channel state information to the base station.

In S114, the base station determines the preliminary joint scheduling information and the second reference signal.

The second reference signal may be different from the first reference signal, and the second reference signal may be generated based on the first channel state information. Specifically, the second reference signal is a beamformed CSI-RS having a plurality of CSI-RS time-frequency resources. Different time-frequency resources may correspond to different beams, and at least one of the beams is formed based on the PMI in the first channel state information. In one particular embodiment, the second RS is used as the first reference signal for the next period. In this case, the first reference signal of the next cycle is omitted, and the preliminary joint scheduling information of the next cycle is determined based on the second CSI/aperiodic new joint scheduling object adjustment recommendation information of one or more cycles before the next cycle.

Different UEs that select the same PMI share one beam. If the first reference signal is CRS or non-precoded CSI-RS, W used by corresponding beamforming_PMay be the same as the PMI in the first channel state information. If the first reference signal is a beamformed CSI-RS, for example, a second reference signal used in the last joint scheduling process, the W used by the first reference signal may be used_P1Multiplying the PMI in the first channel state information, and taking the product as W used by the current beamforming_P. OptionallyIn addition, the PMI in the first channel state information may be directly used as the W used for the beamforming at this time_P。

Due to the fact that the same PMI is selected, namely interference among different UEs sharing the same beam is serious, and the method is not suitable for joint scheduling. The base station may perform preliminary joint scheduling based on beams instead of specific UEs, i.e., the joint scheduling object in the preliminary joint scheduling information is a beam instead of a UE. Since this preliminary scheduling is used to coordinate user equipments for performing interference measurements and user equipments using the same beam will cause similar interference, the beam based preliminary scheduling result is sufficient, which will make it simple to inform this preliminary scheduling and increase the flexibility of subsequently improved scheduling decisions.

Since the second reference signal is a CSI-RS formed by a beam with a plurality of CSI-RS time frequency resources, and different beams correspond to different time frequency resources, in the preliminary joint scheduling information, the corresponding beam can be represented by a parameter of the time frequency resource, that is, the identifier of the joint scheduling object is a corresponding time frequency resource parameter of the joint scheduling object.

The preliminary joint scheduling information may include beam information selected for the user equipment. Likewise, the beam information may also be represented as a corresponding CSI-RS time-frequency resource parameter.

The preliminary joint scheduling information may be carried by a CSI-RS-Config message, and the base station may not transmit the CSI-IM-Config message to the user equipment. At this time, the resourceConfig Information Element (IE) and the subframeConfig information element in the CSI-RS-Config message may include parameters of time-frequency resources corresponding to the joint scheduling beam. If the base station selects the beam for the user equipment, the CSI-RS-Config message may further include a time-frequency resource parameter corresponding to the selected beam, or the base station may notify the user equipment of the selected beam information in other manners.

The preliminary joint scheduling information may also be carried by the CSI-IM-Config message, and the base station still needs to send the CSI-RS-Config message. At this time, the resourceConfig IE and the subframeconfige in the CSI-IM-Config message include parameters of time-frequency resources corresponding to the jointly scheduled beams. The resourceConfig IE and the subframeconfige in the CSI-RS-Config message may include only parameters of time-frequency resources corresponding to beams of other non-joint scheduling objects. If the base station selects the beam for the user equipment, the beam of the non-joint scheduling object can comprise the selected beam; or may only include the parameters of the time-frequency resources corresponding to the jointly scheduled beams; or may include the parameters of the time-frequency resources corresponding to the jointly scheduled beam and the beams of other non-jointly scheduled objects. In a specific embodiment, the CSI-RS-Config message includes parameters of time-frequency resources corresponding to all K beams.

The CSI-RS-Config message and the CSI-IM-Config message are both legacy messages (legacy signaling), which may be used to carry preliminary joint scheduling information without introducing new signaling overhead.

In S115, the base station may transmit the preliminary joint scheduling information and the second reference signal to the user equipment.

In S116, the base station may transmit a first message to the user equipment.

The first message is used for informing the user equipment whether the data transmission of this time uses the improved joint scheduling information or the preliminary joint scheduling information. The user equipment may adjust the second CSI according to the first message before transmitting the second CSI to the base station. For example, if the base station does not plan to use the improved joint scheduling information in the current data transmission, the second CSI of the user equipment may not include delta CQI or improved MU-CQI, but only include preliminary MU-CQI to reduce signaling overhead.

The present step as shown in fig. 4 may be performed before step S117. In fact, this step may be performed at any time prior to step 118. This step may be omitted if the base station has sent the first message to the user equipment in the last cycle and has not yet adjusted.

In S117, the user equipment may measure a second RS from at least the second RS to generate second CSI.

First, the user equipment measures a channel. If the base station has selected a beam for the UE, the UE may directly measure a channel in the corresponding resource. Whether the base station has selected a beam for the UE or not, the UE may measure channels corresponding to a plurality of resources (e.g., resources included in the CSI-RS-Config message), and then select one resource, where the second channel state information includes a CSI-RS resource index indicating the selected resource. The UE may further determine an RI according to the channel measurement result and select a best PMI.

Next, the user equipment calculates a preliminary MU-CQI based at least on the preliminary scheduling information. In distinction to SU-CQI, the process of calculating MU-CQI may require a Signal to Interference plus Noise Ratio (SINR) that takes into account the multi-user Interference to the user equipments within the cell. The interference measurement may only use non-zero Power (NZP) CSI-RS, and determine which CSI-RS resources to measure according to the identifier of the joint scheduling object, i.e., the parameters of the time-frequency resources corresponding to the joint scheduling object.

It should be noted that, only in the case that the UE is able to obtain information of an object that is not in the preliminary joint scheduling information, for example, the preliminary joint scheduling information is carried by the CSI-IM-Config message, and the CSI-RS-Config message includes parameters of other non-joint scheduling objects except for the selected beam, the UE is able to calculate the interference size of the object that is not in the preliminary joint scheduling information, so as to propose to increase the object. In order to reduce the signaling overhead and the power consumption measured by the UE, the UE may be allowed to propose only to remove objects and prohibited from proposing to add objects.

In S118, the user equipment may transmit second channel state information to the base station.

At least an interference indication is included in the second channel state information. The second channel state information further includes CRI if the UE selects the beam by itself. The second channel state information may further include at least one of RI, PMI, and joint scheduling object adjustment suggestion information.

To reduce signaling overhead, the user equipment may remove the preliminary MU-CQI and improve the repeated portion of the parameters (e.g., RI, PMI) corresponding to the MU-CQI from the second CSI at a time. The UE may remove the CRI from the second channel state information if the CRI is the same as the corresponding resource parameter of the beam selected by the base station for the user equipment. Further, the UE may choose not to include the joint scheduling object adjustment suggestion information in the second channel state information, but report the joint scheduling object adjustment suggestion information aperiodically.

At S119, the base station may decide on improved joint scheduling information.

The base station may adjust the preliminary joint scheduling information according to the second channel state information to obtain improved joint scheduling information.

For example, as shown in fig. 6, the base station may transmit non-precoded CSI-RS, i.e., first reference signals, to 5 UEs, UE a, UE B, UE C, UE D, and UE E, which are within its communication range. Each UE measures the non-precoded CSI-RS to obtain respective first channel state information.

The base station may then group each UE according to the first channel state information fed back by the UE, and the grouping result is shown in fig. 7, where the UE representations in the solid line box are divided into the same group and share the same beam. Specifically, the base station divides the UE A and the UE B which select the same PMI into a first group and shares a beam 1; dividing UE C and UE D which select the same PMI into a second group and sharing a beam 2; and separately dividing the UE E, which selects the PMI different from all other UEs, into a third group, and using the beam 3.

The base station takes each beam of the beam 1, the beam 2 and the beam 3 as a preliminary joint scheduling object of other two beams, namely all the beams are jointly scheduled to generate preliminary joint scheduling information, and the preliminary joint scheduling information and a second reference signal generated according to a grouping result are sent to the UE. And each UE measures the second reference signal according to the preliminary joint scheduling information to obtain respective second channel state information.

UE a and UE C may detect that the interference with beam 3 is not within the preset range, respectively, and therefore recommend to remove beam 3 in the respective second channel state information; and UE B and UE D do not suggest such a proposal. And the base station adjusts the preliminary joint scheduling information according to the second channel state information fed back by the user equipment to obtain improved joint scheduling information. Specifically, UE a and UE C are jointly scheduled, and UE B, UE D and UE E are jointly scheduled. As shown in fig. 8, the UEs within the dashed box are all jointly scheduled, with the beam used by each UE being unchanged. It should be noted that the positions of the UEs in fig. 6-8 are only schematic and do not represent actual positions of the UEs.

The following is a simulation of the fourth embodiment of the joint scheduling method of the present invention and the corresponding simulation result, wherein the base station is called eNodeB and abbreviated as eNB.

A 3 rd channel model based on 3GPP TR 36.873 is used and the parameters are shown in table 1.

Table 1: simulation parameters

To illustrate the advantage of using adaptive scheduling with user equipment recommendations, we use the traditional approach of eNB making scheduling decisions as a reference approach.

As shown in fig. 9, we first compare the average throughput of the proposed method with the reference method. Instances where the maximum number of MUs is equal to 1, 2, 3, and 4 were simulated. When MU is 1, the proposed method will degenerate to the baseline method. The simulation results show that the proposed method can achieve a throughput gain of about 10% above baseline for MU > 1.

Next, we compare the proportion of user equipments with higher MU interference. A user equipment with higher MU interference refers to a user equipment whose difference between SU-CQI and MU-CQI exceeds a predefined threshold (i.e., cannot achieve the required MU-MIMO performance gain). In the proposed method, the user equipments will make a recommendation to the eNB based on which the eNB can improve the scheduling, while in the reference method the user equipments do nothing. As shown in fig. 10, is a simulation result.

The simulation results may show that the proposed method may significantly reduce the proportion of user equipments with higher MU interference. The proportion of user equipments with higher MU interference increases with the number of MUs. An increase in the proportion of user equipments with higher MU interference will saturate with an increasing number of MUs.

Next, as shown in fig. 11-13, we show the proportions of different packet sizes in the scheduling results of the proposed method and the reference method. Here, a group means a set of user equipments occupying the same resources and forming MU transmissions. Each group size cannot exceed a preset maximum number of MUs.

Simulation results may indicate that not all user equipments may achieve the maximum number of MUs, as larger sizes are more likely to cause larger MU interference. The baseline approach is intended to make the group size large, and such grouping is large and may cause large MU interference. The proposed method using the user equipment's recommendations can effectively avoid such blind grouping and fewer user equipments can achieve the preset number of MUs compared to the baseline method.

Fig. 14 depicts a flow chart of a fifth embodiment of the multiuser joint scheduling method according to the invention. The method may be performed by a user equipment. The user equipment may be fixed or mobile and includes, but is not limited to, cellular phones, Personal Digital Assistants (PDAs), wireless modems, tablets, laptops, cordless phones, and the like. The method comprises the following steps.

In S21, the user equipment measures a first reference signal from the base station to generate first channel state information.

The first reference signal may be a CRS or a CSI-RS. The first channel state information includes at least a PMI, which indicates that the UE suggests a precoding matrix to be used by the base station in downlink transmission. The precoding matrix is used to map from the layer to the antenna ports. The precoding technique can appropriately weight the antennas according to channel conditions to optimize the spatial distribution characteristics of the signal. The precoding matrix can reflect the weighting process on the antennas. The PMI may or may not be codebook based. The first channel state information may further include RI, CQI, etc. in addition to the PMI. RI denotes a transmission layer (order) that the UE proposes the base station to use in downlink transmission, i.e., the number of spatial layers proposed to be used in downlink joint transmission. The CQI represents the downlink channel quality and the base station may select a code rate for data transmission based on the CQI. It should be noted that the CQI in the first channel state information is generally SU-CQI regardless of interference. Since the user equipment does not consider interference from other user equipments within the same cell during the calculation of the CQI included in the first CSI, the CQI may not accurately reflect the channel quality in the MU-MIMO environment, the base station will not select a code rate for the corresponding data transmission according to the CQI included in the first CSI, and the CQI in the first CSI may be ignored.

In S22, the user equipment may transmit first channel state information to the base station.

In S23, the user equipment may receive preliminary joint scheduling information from the base station.

The preliminary joint scheduling information includes at least one joint scheduling object identifier, the joint scheduling object may use the same time-frequency resource as the user equipment in a space division multiplexing manner, and the preliminary joint scheduling information is obtained based on the first channel state information. A joint scheduling object may be a specific UE or a group of UEs.

In S24, the user equipment may measure a second reference signal from the base station according to at least the preliminary joint scheduling information to generate second channel state information.

The preliminary joint scheduling information and the second reference signal may be transmitted simultaneously or separately. The transmission time of the preliminary joint scheduling information should be no later than the transmission time of the second reference signal.

The second channel state information may include an indication of an interference magnitude with the at least one joint scheduling object. The indication may comprise a multi-user channel quality indicator. The MU-CQI calculated by the user equipment based on the preliminary joint scheduling information-preliminary MU-CQI may reflect interference with all joint scheduling objects in the preliminary joint scheduling information.

In a particular embodiment, the indication of the interference magnitude may also include a modified MU-CQI or a delta CQI, where the delta CQI is a difference between the preliminary MU-CQI and the modified MU-CQI. The second CSI may further include scheduled object adjustment suggestion information.

If the preliminary MU-CQI is not within the preset range, the user equipment may modify the preliminary joint scheduling information such that the MU-CQI calculated based on the modified joint scheduling information is within the preset range. How to modify the preliminary joint scheduling information may be expressed by the joint scheduling object adjustment suggestion information, and the MU-CQI calculated based on the modified joint scheduling information may be referred to as an improved MU-CQI.

The joint scheduling object adjustment suggestion information includes suggestion to remove at least one joint scheduling object including that a total interference size with the user equipment is not within a preset range and/or suggestion to add at least one joint scheduling object having a total interference size with the user equipment is within a preset range and not in the preliminary joint scheduling information. If the user equipment obtains the interference magnitude with the object not in the preliminary joint scheduling information through measurement, it proposes to add one object. To further reduce the signaling overhead and power consumption measured by the user equipment, the user equipment may be prohibited from suggesting additional objects.

The preset range may be fixed, or may be determined by the base station or the UE according to actual circumstances. If the preset range is determined by the base station, the ue needs to receive the preset range from the base station before this step. Generally, the preset range is represented by a threshold value on at least one side thereof. The threshold may be an absolute threshold and the indication of the corresponding interference magnitude is a MU-CQI or a modified MU-CQI. Alternatively, the threshold may be a relative threshold, and the corresponding interference indicator is Δ CQI.

In S25, the user equipment may transmit the second CSI to the base station.

And the base station adjusts the preliminary joint scheduling information according to the second channel state information to obtain improved joint scheduling information. The specific algorithm for obtaining the improved joint scheduling information may depend on actual needs. In general, when the indication of the interference magnitude comprises a preliminary MU-CQI, the adjusting comprises at least removing from the preliminary joint scheduling information an identification of at least one preliminary joint scheduling object in the second channel state information for which a total interference magnitude with the user equipment is not within a preset range, resulting in improved joint scheduling information. If the UE detects the total interference size of at least one object that is not in the preliminary joint scheduling information, the adjusting may further include increasing objects whose total interference size is within a preset range and that are not in the preliminary joint scheduling information.

If the second channel state information further includes joint scheduling object adjustment suggestion information, the base station may accept the suggestion of the UE, and adjust the identifier of the joint scheduling object in the preliminary joint scheduling information according to the joint scheduling object adjustment suggestion information. Of course, the base station may choose not to accept the UE's recommendation and adjust the preliminary joint scheduling information itself.

According to the present embodiment, the base station may transmit the reference signal to the user equipment twice. The user equipment may measure the first reference signal and the first CSI feedback, and the base station may perform preliminary scheduling based on the first reference signal and the first CSI feedback and transmit preliminary scheduling information and the second RS to the user equipment. The user equipment may measure the second RS at least according to the preliminary scheduling information to generate second CSI, and transmit the second CSI to the base station. The base station may then adjust the preliminary scheduling based on the second CSI to obtain improved joint scheduling information. Compared with the prior art, the UE scheduling is determined by the base station in a centralized way, so that the possible conflict caused by the self-determination of different UEs is avoided. Meanwhile, the channel state information fed back after the UE measurement is utilized in the decision process, and the scheduling accuracy is improved, so that the system performance is improved.

Fig. 15 is a flowchart of a sixth embodiment of the multi-user joint scheduling method according to the present invention, which is based on the fifth embodiment of the multi-user joint scheduling method, and further includes the following steps.

At S26, the method includes receiving a message from the base station signaling the user equipment to report aperiodic joint scheduling object adjustment recommendation information.

In other embodiments, step S26 may be omitted if the user equipment transmits the joint scheduling object adjustment information by itself, instead of in response to a message from the base station.

At S27, the method includes transmitting aperiodic joint scheduling object adjustment recommendation information to the base station.

The joint scheduling object adjustment suggestion information may include information suggesting removal of at least one joint scheduling object whose interference size with the user equipment is not within a preset range, and/or information suggesting addition of at least one joint scheduling object whose interference size with the user equipment is within a preset range and which is not in the preliminary joint scheduling information.

When the fifth embodiment of the multiuser joint scheduling method is applied to full-dimensional MIMO and the first reference signal is different from the second reference signal, please refer to the detailed description of the fourth embodiment of the multiuser joint scheduling method, which is not repeated here.

Fig. 16 is a schematic structural diagram of the first embodiment of the base station. The base station may include a first transmitting module 11, a first receiving module 12, a second transmitting module 13, a second receiving module 14, and an adjusting module 15.

The first transmitting module 11 may be configured to transmit a first reference signal to the user equipment.

The first receiving module 12 may be configured to receive first channel state information fed back by the ue measuring the first reference signal.

The second sending module 13 may be configured to send the preliminary joint scheduling information and the second reference signal to the user equipment. The preliminary joint scheduling information includes at least one joint scheduling object identifier, the joint scheduling object may use the same time-frequency resource as the user equipment in a space division multiplexing manner in data transmission, and the preliminary joint scheduling information may be obtained based on the first channel state information.

The second receiving module 14 may be configured to receive, from the ue, second channel state information fed back by the ue at least measuring the second reference signal according to the preliminary joint scheduling information. The second channel state information includes an indication for indicating the interference level with at least one joint scheduling object.

The adjusting module 15 may be configured to adjust the preliminary joint scheduling information according to the second channel state information, so as to obtain improved joint scheduling information.

Specifically, the adjusting module 15 may be configured to remove, from the preliminary joint scheduling information, an identifier of at least one preliminary joint scheduling object in the second channel state information, where a total interference size with the user equipment is not within a preset range.

Specifically, the adjusting module 15 may be configured to add, to the preliminary joint scheduling information, an identifier of at least one joint scheduling object whose total interference with the user equipment is within a preset range and is not in the preliminary joint scheduling information.

In particular, the indication of the interference magnitude may include a preliminary MU-CQI and an improved MU-CQI or delta CQI. The second channel state information may further include joint scheduling object adjustment recommendation information. The adjusting module may be configured to adjust the proposed information according to the joint scheduling object, add the identifier of the joint scheduling object to the preliminary joint scheduling information, or remove the identifier of the joint scheduling object from the preliminary joint scheduling information.

Specifically, the second reference signal may be different from the first reference signal, and the second reference signal may be carried by at least two beamformed signals formed through beamforming, wherein a port virtualization matrix in a mapping matrix used for beamforming of at least one beam is the same as a PMI in the first channel state information.

In particular, the joint scheduling object may be a beam, and different beams may correspond to different time-frequency resources.

Specifically, the identifier of each joint scheduling object may include a parameter of a time-frequency resource corresponding to the joint scheduling object.

Fig. 17 is a schematic structural diagram of a second embodiment of a base station. The base station may comprise a processor 110 and a transceiver 120, the processor 110 being connected to the transceiver 120 by a bus.

The transceiver 120, which may be used to transmit and receive data, is an interface for the base station to communicate with other communication devices.

The processor 110 may control the operation of the base station, and it may also be referred to as a Central Processing Unit (CPU). The processor 110 may be an integrated circuit chip with signal processing capabilities, such as a general purpose processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), an off-the-shelf programmable gate array (FPGA) or other programmable logic device, discrete gates, transistor logic devices, or discrete hardware components. A general purpose processor may be a microprocessor or the processor may be any conventional processor.

The base station may further include a memory (not shown) for storing instructions and data necessary for the operation of the processor 110. The memory may also store data received by the transceiver 120.

The processor 110 may be configured to: transmitting, by the transceiver 120, a first reference signal to the user equipment; receiving, by the transceiver 120, first channel state information fed back by the user equipment measuring the first reference signal from the user equipment; transmitting preliminary joint scheduling information and a second reference signal to the ue through the transceiver 120, where the preliminary joint scheduling information includes an identifier of at least one joint scheduling object, and the joint scheduling object may use the same time-frequency resource as the ue in a space division multiplexing manner during data transmission, and the preliminary joint scheduling information is obtained based on the first channel state information; receiving, by the transceiver 120, second channel state information fed back by the ue by measuring at least a second reference signal according to the preliminary joint scheduling information, where the second channel state information includes an indication of interference from at least one joint scheduling object; and adjusting the preliminary joint scheduling information according to the second channel state information to obtain improved joint scheduling information.

In particular, the processor 110 may be configured to remove, from the preliminary joint scheduling information, an identification of at least one preliminary joint scheduling object in the second channel state information, where a total interference level with the user equipment is not within a preset range.

Specifically, the processor 110 may be configured to add, to the preliminary joint scheduling information, an identification of at least one preliminary joint scheduling object whose total interference size is within a preset range and is not in the preliminary joint scheduling information.

In particular, the indication of the interference size may comprise a MU-CQI.

In particular, the indication of the interference size may also include an improved MU-CQI or a delta CQI. The second channel state information may include joint scheduling object adjustment recommendation information. The processor 110 may be configured to adjust the suggested information according to the joint scheduling object, add an identifier of the joint scheduling object to the preliminary joint scheduling information, or remove the identifier of the joint scheduling object from the preliminary joint scheduling information.

In particular, the processor 100 may be further configured to: receiving, by the transceiver 120, aperiodic preliminary joint scheduling object adjustment suggestion information from the user equipment; and adjusting the suggestion information according to the joint scheduling object, adding the identification of the joint scheduling object to the preliminary joint scheduling information, or removing the identification of the joint scheduling object from the preliminary joint scheduling information to obtain improved joint scheduling information.

Specifically, the processor 110 may be further configured to send a message to the user equipment through the transceiver 120 to signal the user equipment to report the aperiodic joint scheduling object adjustment suggestion information before receiving the aperiodic joint scheduling object adjustment suggestion information through the transceiver 120.

In particular, the processor 110 may be further configured to transmit data based on the improved joint scheduling information or the preliminary joint scheduling information, wherein the improved joint scheduling information is used for data transmission of a next period in a case where the data is transmitted based on the preliminary joint scheduling information.

In particular, the processor 110 may be further configured to send a message to the user equipment through the transceiver 120 to inform the user equipment whether the data transmission uses the improved joint scheduling information or the preliminary joint scheduling information in the current period.

In particular, the processor 110 may be further configured to transmit the preset range to the user equipment through the transceiver 120, wherein the preset range may be represented by a threshold value at least one end thereof. The threshold may be an absolute threshold or a relative threshold.

In particular, the second reference signal may be different from the first reference signal, and the second reference signal may be generated based on the first channel state information.

Specifically, the second reference signal may be carried by at least two beams formed by beamforming, wherein a port virtualization matrix in a mapping matrix used for beamforming of at least one beam may be the same as the PMI in the first channel state information.

Specifically, the second RS may be used as the first reference signal of the next period, and/or the first reference signal may be the first reference signal or the second RS of the current period.

Specifically, the preliminary joint scheduling information may further include information of a beam selected for the user equipment; and/or the second channel state information comprises beam information selected by the user equipment.

Specifically, the joint scheduling object may be a beam.

Specifically, different beams may correspond to different time-frequency resources.

Specifically, the preliminary joint scheduling information may be carried by a CSI-RS-Config message or a CSI-IM-Config message.

The functions of the respective components or modules of the base station according to the present embodiment may specifically refer to the relevant description of the corresponding method embodiments, and are not repeated here.

As shown in fig. 18, is a first embodiment of a user equipment according to the present invention. The user equipment may include a first measurement module 21, a first transmission module 22, a first reception module 23, a second measurement module 24, and a second transmission module 25

The first measurement module 21 may be configured to measure a first reference signal from a base station to generate first channel state information.

The first transmitting module 22 may be configured to transmit the first channel state information to the base station.

The first receiving module 23 may be configured to receive preliminary joint scheduling information from the base station. The preliminary joint scheduling information may include an identification of at least one joint scheduling object, and the joint scheduling object may use the same time-frequency resources as the user equipment in a space-division multiplexing manner in data transmission. The preliminary joint scheduling information may be derived based on the first channel state information.

The second measurement module 24 may be configured to measure a second reference signal from the base station based at least on the preliminary joint scheduling information to generate second channel state information. An indication representing the interference magnitude with at least one joint scheduling object may be included in the second channel state information.

The second sending module 25 may be configured to send the second channel state information to the base station, so that the base station may adjust the preliminary joint scheduling information according to the second channel state information to obtain the improved joint scheduling information.

In particular, the indication of the interference magnitude may include a preliminary MU-CQI and an improved MU-CQI or delta CQI. The second CSI may further include joint scheduling object adjustment suggestion information, which may include information suggesting removal of at least one joint scheduling object whose total interference size with the user equipment is not within a preset range, and/or information adding at least one joint scheduling object whose interference indication is within the preset range and is not in the preliminary joint scheduling information.

Specifically, the second sending module may be configured to remove the preliminary MU-CQI and the repeated portion of the parameters corresponding to the improved MU-CQI from the second channel state information at a time, and send the reduced second CSI to the base station.

Fig. 19 is a schematic structural diagram of a second embodiment of the user equipment according to the present invention, which is based on the first embodiment of the user equipment, and further includes a third sending module 26, configured to send aperiodic joint scheduling object adjustment suggestion information to the base station.

The joint scheduling object adjustment suggestion information may include information suggesting removal of at least one joint scheduling object whose total interference size with the user equipment is not within a preset range, and/or information suggesting addition of at least one joint scheduling object whose total interference size is within a preset range and is not in the preliminary joint scheduling information.

Fig. 20 is a schematic structural diagram of a third embodiment of a user equipment according to the present invention. The user equipment comprises a processor 210 and a communication circuit 220, the processor 210 being connected to the communication circuit 220 via a bus.

The communication circuit 220 may be used to send and receive data and is an interface for the user equipment to communicate with other communication devices.

The processor 210 may control the operation of the user equipment and may also be referred to as a Central Processing Unit (CPU). The processor 210 may be an integrated circuit chip with signal processing capabilities, such as a general purpose processor, a digital signal processor, an application specific integrated circuit, an off-the-shelf programmable gate array or other programmable logic device, discrete gates, transistor logic, or discrete hardware components. A general purpose processor may be a microprocessor or the processor may be any conventional processor.

The user device may further include a memory (not shown) for storing instructions and data necessary for the operation of the processor 210. The memory may also store data received by the communication circuit 220.

The processor 210 may be configured to: measuring, by the communication circuit 220, a first reference signal from a base station to generate first channel state information; transmitting the first channel state information to the base station through the communication circuit 220; receiving, by the communication circuit 220, preliminary joint scheduling information from the base station, where the preliminary joint scheduling information includes an identifier of at least one joint scheduling object, and the joint scheduling object may use the same time-frequency resource as the user equipment in a space division multiplexing manner in data transmission, and the preliminary joint scheduling information is obtained based on the first channel state information; measuring a second reference signal from the base station through the communication circuit 220 according to at least the preliminary joint scheduling information to generate second channel state information, wherein the second channel state information includes an indication of interference magnitude from at least one joint scheduling object; the second channel state information is sent to the base station through the communication circuit 220, so that the base station can adjust the preliminary joint scheduling information according to the second channel state information to obtain improved joint scheduling information.

In particular, the indication of the interference size may comprise a MU-CQI.

In particular, the indication of the interference size may also include an improved MU-CQI or a delta CQI. The second channel state information may include joint scheduling object adjustment suggestion information, which may include information suggesting removal of at least one joint scheduling object whose total interference size with the user equipment is not within a preset range, and/or information suggesting addition of at least one joint scheduling object whose total interference size is within a preset range and is not in the preliminary joint scheduling information.

Specifically, the processor 210 may be configured to remove the preliminary MU-CQI and the repeated portion of the parameters corresponding to the improved MU-CQI from the second channel state information at a time, and send the reduced second CSI to the base station.

Specifically, the processor 210 may be configured to transmit aperiodic joint scheduling object adjustment suggestion information to the base station through the communication circuit 220, where the joint scheduling object adjustment suggestion information includes information suggesting to remove at least one joint scheduling object whose total interference with the user equipment is not within a preset range, and/or information suggesting to add at least one joint scheduling object whose total interference with the user equipment is within the preset range and is not in the preliminary joint scheduling information.

Specifically, the processor 210 may be further configured to receive a message from the base station through the communication circuit 220 signaling the user equipment to report the aperiodic joint scheduling object adjustment suggestion information before the aperiodic joint scheduling object adjustment suggestion information is transmitted to the base station through the communication circuit 220.

In particular, the processor 210 may be further configured to: receiving a message from the base station through the communication circuit 220, which informs the user equipment whether the current periodic data transmission uses the improved joint scheduling information or the preliminary joint scheduling information; and adjusting the second CSI based on the message prior to transmitting the second CSI to the base station through the communication circuitry 220.

In particular, the second reference signal may be carried by at least two beams formed by beamforming. The preliminary joint scheduling information may include beam information selected for the user equipment. The second channel state information may include beam information selected by the user equipment itself.

The functions of the respective components or modules of the user equipment according to the present embodiment may specifically refer to the relevant description of the corresponding method embodiments, and are not repeated here.

It should be understood that the disclosed base station, user equipment and method can be implemented in other ways. Of course, the base station and the user equipment described above are merely illustrative, and for example, the division of modules or units is only one logical division, and there may be other divisions when actually implemented, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. Further, the shown or discussed mutual coupling or direct coupling or communication connection may be realized by some interfaces, devices or units, and may be realized electrically, mechanically or otherwise.

The separate units described may or may not be physically separate units. Components shown as units may or may not be physical units and may be located at one location or may be distributed across multiple network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the invention.

In addition, each functional unit discussed in the present invention may be integrated into one processing unit, or each unit may exist separately and physically, and two or more units may be integrated into one unit. The integrated unit can be realized by hardware or a software functional unit.

If the integrated unit is implemented as a software functional unit and sold or used as a separate product, it may be stored in a computer readable storage medium. Based on such understanding, the essential technical solution of the present invention or all or part of the technical solution may be implemented as a software product. A computer software product may be stored in a storage medium and may include instructions that cause a computing device (e.g., a personal computer, server, or network device, etc.) or processor to perform all or part of the methods described herein. The storage medium may include all kinds of media that can store program codes, for example, a USB flash disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and the like.

The above description is only some exemplary embodiments of the present invention, and does not limit the scope of the present invention. Any equivalent structure or equivalent flow transformation made by the invention or any direct or indirect application of the invention in other related technical fields shall be included in the scope of the patent protection of the invention.

Claims

1. A multi-user joint scheduling method is characterized by comprising the following steps:

transmitting a first reference signal to a user equipment;

receiving, from the user equipment, first channel state information fed back by the user equipment for measuring the first reference signal;

sending preliminary joint scheduling information and a second reference signal to the user equipment, wherein the preliminary joint scheduling information comprises an identifier of at least one joint scheduling object, the joint scheduling object uses the same time-frequency resource as the user equipment in space division multiplexing during data transmission, and the preliminary joint scheduling information is obtained based on the first channel state information;

receiving, from the ue, second channel state information fed back by the ue at least according to the preliminary joint scheduling information to measure the second reference signal, where the second channel state information includes an indication of interference from the at least one joint scheduling object; and

adjusting the preliminary joint scheduling information according to the second channel state information to obtain improved joint scheduling information;

wherein the adjusting the preliminary joint scheduling information according to the second channel state information comprises:

and removing the identifier of at least one preliminary joint scheduling object in the second channel state information from the preliminary joint scheduling information, wherein the total interference between the at least one joint scheduling object and the user equipment is not in a preset range.

2. The method of claim 1,

the adjusting the preliminary joint scheduling information according to the second channel state information further comprises:

and adding an identifier of at least one joint scheduling object to the preliminary joint scheduling information, wherein the total interference between the at least one joint scheduling object and the user equipment is within the preset range and is not in the preliminary joint scheduling information.

3. The method of claim 1, wherein the indication of interference magnitude comprises a preliminary multi-user channel quality indicator.

4. The method of claim 3, wherein the indication of interference magnitude further comprises a modified multi-user channel quality indicator or delta CQI;

the second channel state information further comprises joint scheduling object adjustment suggestion information; and

the adjusting the preliminary joint scheduling information according to the second channel state information includes:

and adjusting the suggestion information according to the joint scheduling object, and adding the identifications of a plurality of joint scheduling objects to the preliminary joint scheduling information or removing the identifications of a plurality of joint scheduling objects from the preliminary joint scheduling information.

5. The method of claim 1, further comprising:

receiving aperiodic joint scheduling object adjustment suggestion information from the user equipment; and

and adjusting the suggestion information according to the joint scheduling object, adding the identifications of a plurality of joint scheduling objects to the preliminary joint scheduling information, or removing the identifications of the plurality of joint scheduling objects from the preliminary joint scheduling information to obtain improved joint scheduling information.

6. The method of claim 5, further comprising, prior to receiving aperiodic joint scheduling object adjustment recommendation information:

and sending a message to the user equipment to signal the user equipment to report the aperiodic joint scheduling object adjustment suggestion information.

7. The method of any one of claims 1-6, further comprising:

transmitting data according to the improved joint scheduling information or preliminary joint scheduling information, wherein in case that the data is transmitted based on the preliminary joint scheduling information, the improved joint scheduling information is used for data transmission of a next period.

8. The method of claim 7, further comprising:

sending a message to the UE to inform the UE whether the current periodic data transmission uses the improved joint scheduling information or the preliminary joint scheduling information.

9. The method of any one of claims 1-6, further comprising:

sending a preset range to the user equipment, wherein the preset range is represented by at least one threshold value of one end, and the threshold value is an absolute threshold value or a relative threshold value.

10. The method according to any one of claims 1 to 6,

the second reference signal is different from the first reference signal, and the second reference signal is generated based on the first channel state information.

11. The method of claim 10,

the second reference signals are carried by at least two beams formed by beamforming, wherein a port virtualization matrix in a plurality of mapping matrices used for beamforming of at least one beam is the same as precoding matrix information in the first channel state information.

12. The method of claim 11,

the second reference signal is used as a second reference signal for a next period, wherein the first reference signal for the next period is omitted, and the preliminary joint scheduling information is determined based on second channel state information/aperiodic joint scheduling object adjustment suggestion information of one or more periods before the next period.

13. The method of claim 11,

the preliminary joint scheduling information further includes beam information selected for the user equipment; and/or the second channel state information comprises beam information selected by the user equipment.

14. The method of claim 11,

each joint scheduling object is a beam.

15. The method of claim 14,

and different beams correspond to different time frequency resources.

16. The method of claim 15,

the identifier of each joint scheduling object comprises a plurality of parameters of the time-frequency resource corresponding to the joint scheduling object.

17. The method of claim 16,

18. A multi-user joint scheduling method is characterized by comprising the following steps:

the user equipment measures a first reference signal from a base station to generate first channel state information;

the user equipment sends the first channel state information to the base station;

the user equipment receives preliminary joint scheduling information from the base station, wherein the preliminary joint scheduling information comprises an identifier of at least one joint scheduling object, the joint scheduling object uses the same time-frequency resources with the user equipment in space division multiplexing in data transmission, and the preliminary joint scheduling information is obtained based on the first channel state information;

the UE measures a second reference signal from the base station at least according to the preliminary joint scheduling information to generate second channel state information, wherein the second channel state information comprises an indication of interference from the at least one joint scheduling object; and

the user equipment sends the second channel state information to the base station, so that the base station adjusts the preliminary joint scheduling information according to the second channel state information to obtain improved joint scheduling information;

wherein the adjusting, by the base station, the preliminary joint scheduling information according to the second channel state information includes:

and the base station removes the identifier of at least one preliminary joint scheduling object in the second channel state information from the preliminary joint scheduling information, wherein the total interference between the at least one joint scheduling object and the user equipment is not in a preset range.

19. The method of claim 18,

the indication of the interference magnitude comprises a preliminary multi-user channel quality indicator.

20. The method of claim 19, wherein the indication of the interference magnitude further comprises a modified multi-user channel quality indicator or delta CQI;

the second channel state information further includes joint scheduling object adjustment suggestion information including information suggesting removal of at least one joint scheduling object whose total interference with the user equipment is not within a preset range, and/or information suggesting addition of at least one joint scheduling object whose total interference with the user equipment is within a preset range and is not in the preliminary joint scheduling information.

21. The method of claim 20, wherein sending second channel state information to the base station comprises:

and removing repeated parts of a plurality of parameters corresponding to the preliminary multi-user channel quality indicator and the improved multi-user channel quality indicator from the second channel state information at one time, and sending the simplified second channel state information to the base station.

22. The method of claim 18, further comprising:

and sending aperiodic joint scheduling object adjustment suggestion information to the base station, wherein the joint scheduling object adjustment suggestion information comprises information suggesting that at least one joint scheduling object with the total interference size of the user equipment is not within a preset range is removed, and/or information suggesting that at least one joint scheduling object with the total interference size of the user equipment is not within the preset range and is not in the preliminary joint scheduling information is added.

23. The method of claim 22, wherein before transmitting the aperiodic joint scheduling object adjustment suggestion information, further comprising:

and receiving a message from the base station, wherein the message signals the user equipment to report the aperiodic joint scheduling object adjustment suggestion information.

24. The method of any one of claims 20-23, further comprising:

receiving a preset range from the base station, wherein the preset range is represented by a threshold value at least one end, and the threshold value is an absolute threshold value or a relative threshold value.

25. The method according to any of claims 18-23, further comprising, prior to transmitting the second channel state information to the base station:

receiving a message from the base station, the message informing the user equipment whether the current period of data transmission uses improved joint scheduling information or preliminary joint scheduling information; and

adjusting the second channel state information based on the message.

26. The method of any one of claims 18-23,

27. The method of any one of claims 18-23,

the second reference signal is carried by at least two beams formed by beamforming, the preliminary joint scheduling information further includes beam information selected for the user equipment, and the second channel state information further includes beam information selected by the user equipment.

28. A base station, comprising:

a first sending module, configured to send a first reference signal to a user equipment;

a first receiving module, configured to receive, from the ue, first channel state information fed back by the ue for measuring the first reference signal;

a second sending module, configured to send preliminary joint scheduling information and a second reference signal to the ue, where the preliminary joint scheduling information includes an identifier of at least one joint scheduling object, the joint scheduling object uses the same time-frequency resource as the ue in space division multiplexing during data transmission, and the preliminary joint scheduling information is obtained based on the first channel state information;

a second receiving module, configured to receive, from the ue, second channel state information fed back by the ue by measuring at least the second reference signal according to the preliminary joint scheduling information, where the second channel state information includes an indication of interference from the at least one joint scheduling object; and

an adjusting module, configured to adjust the preliminary joint scheduling information according to the second channel state information, so as to obtain improved joint scheduling information;

the adjusting module is configured to remove, from the preliminary joint scheduling information, an identifier of at least one preliminary joint scheduling object in the second channel state information, where a total interference level between the at least one joint scheduling object and the ue is not within a preset range.

29. The base station of claim 28,

the adjusting module is further configured to add an identifier of at least one joint scheduling object to the preliminary joint scheduling information, where a total interference level between the at least one joint scheduling object and the ue is within the preset range and is not in the preliminary joint scheduling information.

30. The base station of claim 28,

the indication of the interference magnitude comprises a preliminary multi-user channel quality indicator and an improved multi-user channel quality indicator or delta CQI;

the adjusting module is configured to adjust the suggested information according to the joint scheduling object, add the identifier of the at least one joint scheduling object to the preliminary joint scheduling information, or remove the identifiers of the multiple joint scheduling objects from the preliminary joint scheduling information.

31. The base station according to any of claims 28-30,

the second reference signal is different from the first reference signal, the second reference signal is carried by at least two beams formed by beamforming, and a port virtualization matrix in a plurality of mapping matrices used by beamforming of at least one beam is the same as precoding matrix information in the first channel state information.

32. A user device, comprising:

a first measurement module, configured to measure a first reference signal from a base station to generate first channel state information;

a first sending module, configured to send the first channel state information to the base station;

a first receiving module, configured to receive preliminary joint scheduling information from the base station, where the preliminary joint scheduling information includes an identifier of at least one joint scheduling object, the joint scheduling object uses the same time-frequency resource as the user equipment in space division multiplexing during data transmission, and the preliminary joint scheduling information is obtained based on the first channel state information;

a second measurement module, configured to measure a second reference signal from the base station according to at least the preliminary joint scheduling information to generate second channel state information, where the second channel state information includes an indication of interference from the at least one joint scheduling object; and

a second sending module, configured to send the second channel state information to the base station, so that the base station adjusts the preliminary joint scheduling information according to the second channel state information, to obtain improved joint scheduling information;

the second sending module is configured to enable the base station to remove, from the preliminary joint scheduling information, an identifier of at least one preliminary joint scheduling object in the second channel state information, where a total interference size between the at least one joint scheduling object and the user equipment is not within a preset range.

33. The user equipment of claim 32,

34. The user equipment of claim 32,

the second sending module is configured to remove repeated portions of the plurality of parameters corresponding to the preliminary multi-user channel quality indicator and the improved multi-user channel quality indicator from the second channel state information at a time, and send the reduced second channel state information to the base station.

35. The user equipment of claim 32, further comprising:

a third sending module, configured to send aperiodic joint scheduling object adjustment suggestion information to the base station, where the joint scheduling object adjustment suggestion information includes information that suggests to remove at least one joint scheduling object whose total interference with the user equipment is not within a preset range, and/or information that suggests to add at least one joint scheduling object whose total interference with the user equipment is within the preset range and is not in the preliminary joint scheduling information.

36. A base station comprising a processor and a transceiver, said processor coupled to said transceiver;

the processor is configured to:

transmitting, by the transceiver, a first reference signal to a user equipment;

receiving, by the transceiver, first channel state information fed back by the user equipment measuring the first reference signal from the user equipment;

transmitting, by the transceiver, preliminary joint scheduling information and a second reference signal to the user equipment, the preliminary joint scheduling information including an identifier of at least one joint scheduling object, the joint scheduling object using the same time-frequency resource as the user equipment in space division multiplexing during data transmission, the preliminary joint scheduling information being obtained based on the first channel state information;

receiving, by the transceiver from the ue, second channel state information fed back by the ue at least according to the preliminary joint scheduling information to measure the second reference signal, where the second channel state information includes an indication of interference from the at least one joint scheduling object; and

the processor is configured to remove, from the preliminary joint scheduling information, an identifier of at least one preliminary joint scheduling object in the second channel state information, where a total interference level between the at least one joint scheduling object and the ue is not within a preset range.

37. The base station of claim 36,

the processor is further configured to add an identifier of at least one joint scheduling object to the preliminary joint scheduling information, where a total interference level between the at least one joint scheduling object and the ue is within the preset range and is not in the preliminary joint scheduling information.

38. The base station of claim 36, wherein the indication of the interference magnitude comprises a preliminary multi-user channel quality indicator.

39. The base station of claim 38, wherein the indication of the interference magnitude further comprises a modified multi-user channel quality indicator or delta CQI;

the processor is configured to adjust the recommendation information according to the joint scheduling object, add identifiers of multiple joint scheduling objects to the preliminary joint scheduling information, or remove identifiers of multiple joint scheduling objects from the preliminary joint scheduling information.

40. The base station of claim 36, wherein the processor is further configured to:

receiving, by the transceiver, aperiodic joint scheduling object adjustment recommendation information from the user equipment; and

41. The base station of claim 40, wherein prior to receiving, by the transceiver, aperiodic joint scheduling object adjustment recommendation information, the processor is further configured to:

receiving a message to the UE via the transceiver to signal the UE to report aperiodic Joint scheduling object adjustment suggestion information.

42. The base station of any of claims 36-41, wherein the processor is further configured to:

43. The base station of claim 42, wherein the processor is further configured to:

sending, by the transceiver, a message to the user equipment to inform the user equipment whether a current periodic data transmission uses improved joint scheduling information or preliminary joint scheduling information.

44. The base station of any of claims 36-41, wherein the processor is further configured to:

transmitting, by the transceiver, a preset range to the user equipment, wherein the preset range is represented by a threshold at least one end, the threshold being an absolute threshold or a relative threshold.

45. The base station according to any of claims 36-41,

46. The base station of claim 45,

47. The base station of claim 46,

48. The base station of claim 46,

49. The base station of claim 46,

each joint scheduling object is a beam.

50. The base station of claim 49,

and different beams correspond to different time frequency resources.

51. The base station of claim 50,

52. The base station of claim 51,

53. A user device comprising a processor and a communication circuit, the communication circuit coupled to the processor, the processor configured to:

measuring, by the communication circuitry, a first reference signal from a base station to generate first channel state information;

transmitting the first channel state information to the base station over the communication circuit;

receiving, by the communications circuitry, preliminary joint scheduling information from the base station, the preliminary joint scheduling information including an identification of at least one joint scheduling object that uses the same time-frequency resources as the user equipment in data transmission with space division multiplexing, the preliminary joint scheduling information being derived based on the first channel state information;

measuring, by the communication circuit, a second reference signal from the base station at least according to the preliminary joint scheduling information to generate second channel state information, the second channel state information including an indication of an interference level from the at least one joint scheduling object; and

sending the second channel state information to the base station through the communication circuit, so that the base station adjusts the preliminary joint scheduling information according to the second channel state information to obtain improved joint scheduling information;

enabling, by the communication circuit, the base station to remove, from the preliminary joint scheduling information, an identifier of at least one preliminary joint scheduling object in the second channel state information, where a total interference level between the at least one joint scheduling object and the user equipment is not within a preset range.

54. The user equipment of claim 53,

55. The UE of claim 54, wherein the indication of interference magnitude further comprises a modified multiuser channel quality indicator or Δ CQI; and

the second channel state information further includes joint scheduling object adjustment suggestion information, which includes information suggesting to remove at least one joint scheduling object whose total interference with the user equipment is not within a preset range, and/or information suggesting to add at least one joint scheduling object whose total interference with the user equipment is within a preset range and is not in the preliminary joint scheduling information.

56. The user equipment of claim 55, wherein the processor is configured to include:

and removing repeated parts of a plurality of parameters corresponding to the preliminary multi-user channel quality indicator and the improved multi-user channel quality indicator from the second channel state information at one time, and sending the simplified second channel state information to the base station through the communication circuit.

57. The user equipment of claim 53, wherein the processor is further configured to:

transmitting aperiodic joint scheduling object adjustment suggestion information to the base station through the communication circuit, the joint scheduling object adjustment suggestion information including information suggesting removal of at least one joint scheduling object whose total interference size with the user equipment is not within a preset range, and/or information suggesting addition of at least one joint scheduling object whose total interference size with the user equipment is within the preset range and not in the preliminary joint scheduling information.

58. The UE of claim 57, wherein prior to sending aperiodic Joint scheduling object adjustment suggestion information over the communication circuit, the processor is further configured to:

59. The user equipment of any of claims 55-58, further comprising:

receiving, by the communication circuit, a preset range from the base station, wherein the preset range is represented by a threshold at least one end, and the threshold is an absolute threshold or a relative threshold.

60. The user equipment of any of claims 55-58, wherein prior to sending the second channel state information to the base station via the communication circuitry, the processor is further configured to:

adjusting the second channel state information based on the message.

61. The user equipment according to any of claims 53-58,

62. The user equipment according to any of claims 53-58,