CN111586873B

CN111586873B - Information processing method, information processing device, communication equipment and computer readable storage medium

Info

Publication number: CN111586873B
Application number: CN201910118195.2A
Authority: CN
Inventors: 苏昕; 高秋彬; 陈润华; 王蒙军
Original assignee: Datang Mobile Communications Equipment Co Ltd
Current assignee: Datang Mobile Communications Equipment Co Ltd
Priority date: 2019-02-15
Filing date: 2019-02-15
Publication date: 2022-07-08
Anticipated expiration: 2039-02-15
Also published as: CN111586873A

Abstract

The invention relates to the technical field of communication, and provides an information processing method, an information processing device, communication equipment and a computer readable storage medium, which are used for solving the problem of interference among DMRSs of PDSCHs when a plurality of PDSCHs are scheduled by a plurality of PDCCHs. The information processing method is applied to a first sending transmission point, the first sending transmission point and at least one second sending transmission point transmit PDSCH to the same terminal, and comprises the following steps: acquiring scheduling information of a network side and/or performing information interaction with a second transmission point, and acquiring information of a second DMRS (demodulation reference signal) of a PDSCH (physical downlink shared channel) transmitted to a terminal by the second transmission point; and transmitting a first DMRS of the PDSCH to the terminal according to the information of the second DMRS, wherein the first DMRS is consistent with the second DMRS in position, and the CDM groups of the first DMRS and the second DMRS are different. The invention can avoid the interference between DMRS of each PDSCH when a plurality of PDSCHs are scheduled by a plurality of PDCCHs.

Description

Information processing method, information processing device, communication equipment and computer readable storage medium

Technical Field

Embodiments of the present invention relate to the field of communications technologies, and in particular, to an information processing method and apparatus, a communication device, and a computer-readable storage medium.

Background

In order to improve coverage at the cell edge and provide more balanced service quality in the service area, multipoint cooperation is still an important technical means in an NR (New Radio) system. From the perspective of network morphology, the network deployment in a manner of centralized processing of a large number of distributed access points + baseband is more beneficial to providing a balanced user experience rate, and significantly reduces the time delay and signaling overhead caused by handover. With the increase of frequency bands, relatively dense deployment of access points is also required from the viewpoint of ensuring network coverage. In the high frequency band, as the integration level of the active antenna device is increased, the modularized active antenna array is more likely to be adopted. The antenna array of each TRP (Transmission Reception Point) can be divided into several relatively independent antenna panels, so that the form and port number of the whole array plane can be flexibly adjusted according to the deployment scene and the service requirement. And the antenna panels or TRPs can be connected by optical fibers, so that more flexible distributed deployment can be carried out. In the millimeter wave band, as the wavelength is reduced, the blocking effect generated by obstacles such as a human body or a vehicle is more remarkable. In this case, from the viewpoint of ensuring the link connection robustness, it is also possible to reduce the adverse effect of the blocking effect by performing transmission/reception from a plurality of beams at a plurality of angles by using cooperation between a plurality of TRPs or panels.

The coordinated multipoint transmission technique can be divided into coherent and non-coherent transmission according to the mapping relation of the transmission signal flow to a plurality of TRPs and/or panels. Wherein, in coherent transmission, each data layer is mapped onto multiple TRPs and/or panels by weighting vectors. Whereas in non-coherent transmission, each data stream is mapped onto only a portion of the TRP and/or the panel. Coherent transmission has higher requirements on synchronization between transmission points and transmission capability of a backhaul link, and is sensitive to many non-ideal factors in real deployment conditions. Relatively, the non-coherent transmission is less affected by the above factors, and thus is an important consideration for the multi-point transmission technology.

The non-coherent transmission may use a single PDCCH (Physical Downlink Control Channel) to schedule a single PDSCH (Physical Downlink Shared Channel), or may use multiple PDCCHs (multi-PDCCH) to schedule corresponding PDSCHs.

When the multi-PDCCH is used, the interference between DMRSs of two PDSCHs and the interference between DMRS of one PDSCH and data of another PDSCH need to be considered. But the multi-PDCCH is mainly used in the case where fallback conditions are less than ideal. In this case, it is difficult for the existing scheme to perform more dynamic coordination on the transmission of the PDSCH.

Disclosure of Invention

In view of this, embodiments of the present invention provide an information processing method, an apparatus, a communication device, and a computer-readable storage medium, so as to solve the problem of interference between DMRSs of PDSCHs when multiple PDSCHs are scheduled by multiple PDCCHs.

In order to solve the technical problem, the invention is realized as follows:

in a first aspect, an embodiment of the present invention provides an information processing method, which is applied to a first transmission and transmission point, where the first transmission and transmission point and at least one second transmission and transmission point transmit a physical downlink shared channel PDSCH to a same terminal, and the method includes:

acquiring scheduling information of a network side and/or performing information interaction with the second sending transmission point, and acquiring information of a second demodulation reference signal (DMRS) of the PDSCH transmitted to the terminal by the second sending transmission point;

and transmitting a first DMRS of the PDSCH to the terminal according to the information of the second DMRS, wherein the first DMRS is consistent with the second DMRS in position, and the Code Division Multiplexing (CDM) groups of the first DMRS and the second DMRS are different.

Optionally, the method specifically includes:

receiving scheduling information on a network side, the scheduling information indicating at least one first CDM group allocated for the first transmission point, the first CDM group being different from a second CDM group allocated for the second transmission point on the network side;

transmitting the first DMRS to the terminal with the first CDM group.

Optionally, the method specifically includes:

performing information interaction with the second sending transmission point to acquire a second CDM group used by the second sending transmission point for sending the second DMRS;

transmitting the first DMRS to the terminal with a first CDM group different from the second CDM group.

Optionally, the method further includes:

transmitting information of a CDM group not used for data transmission to the terminal.

Optionally, the method specifically includes:

acquiring scheduling information of a network side, wherein the scheduling information comprises the actual scheduling symbol number of the PDSCH;

acquiring the number of preset scheduling symbols of the PDSCH, and determining the distribution positions of DMRS symbols according to the number of the preset scheduling symbols, the actual scheduling symbols of the PDSCH and a preset DMRS position table, wherein the preset DMRS position table comprises the corresponding relation between the number of the preset scheduling symbols of the PDSCH and the positions of the DMRS symbols;

and transmitting the first DMRS to the terminal according to the determined distribution position of the DMRS symbols.

Optionally, if the number of the preset scheduling symbols is not consistent with the number of the actual scheduling symbols, and the distribution position of the DMRS symbol is not on the scheduled symbol, the DMRS other than the scheduled symbol is not transmitted.

Optionally, the obtaining of the preset scheduling symbol number of the PDSCH includes any one of:

acquiring the preset scheduling symbol number of the PDSCH configured by a network side through high-level signaling;

acquiring a preset scheduling symbol number of a PDSCH configured by a network side through bottom layer signaling;

acquiring a preset scheduling symbol number of a PDSCH which is stipulated in advance or is stipulated by a protocol or is preset.

Optionally, the method further includes:

receiving terminal processing capacity information of the terminal;

and controlling the total data volume of the PDSCH transmitted to the terminal not to exceed the maximum data processing volume indicated by the terminal processing capacity information according to the terminal processing capacity information.

Optionally, the total data amount includes a total number of codewords and a number of layers included in the PDSCH.

Optionally, the first DMRS includes a preamble DMRS and an additional DMRS.

Optionally, the first sending transmission point and the second sending transmission point are non-quasi co-located.

In a second aspect, an embodiment of the present invention further provides an information processing method, applied to a terminal, including:

and receiving a first DMRS of the PDSCH transmitted by a first sending transmission point and a second DMRS of the PDSCH transmitted by a second sending transmission point, wherein the first DMRS and the second DMRS are consistent in position, and Code Division Multiplexing (CDM) groups to which the first DMRS and the second DMRS belong are different.

Optionally, the method further includes:

receiving information of CDM groups, which are not used for data transmission, of the first transmission point and the second transmission point.

Optionally, the method further includes:

and sending terminal processing capacity information to the first sending transmission point and the second sending transmission point, wherein the terminal processing capacity information indicates the maximum data processing capacity of the terminal.

In a third aspect, an embodiment of the present invention further provides a sending transmission point, where the sending transmission point and at least one second sending transmission point transmit a physical downlink shared channel PDSCH to a same terminal, where the sending transmission point includes: a transceiver, a memory, a processor, and a program stored on the memory and executable on the processor; the transceiver is configured to acquire scheduling information of a network side and/or perform information interaction with the second transmission point, and acquire information of a second demodulation reference signal DMRS of a PDSCH transmitted by the second transmission point to the terminal; and transmitting a first DMRS of the PDSCH to the terminal according to the information of the second DMRS, wherein the first DMRS is consistent with the second DMRS in position, and the Code Division Multiplexing (CDM) groups of the first DMRS and the second DMRS are different.

Optionally, the transceiver is configured to receive scheduling information on a network side, where the scheduling information indicates at least one first CDM group allocated to the transmission point, where the first CDM group is different from a second CDM group allocated to the second transmission point on the network side; transmitting the first DMRS to the terminal with the first CDM group.

Optionally, the transceiver is specifically configured to perform information interaction with the second sending transmission point, and acquire a second CDM group used by the second sending transmission point to send the second DMRS; transmitting the first DMRS to the terminal with a first CDM group different from the second CDM group.

Optionally, the transceiver is further configured to send information of a CDM group, which is not used for data transmission, to the terminal.

Optionally, the transceiver is configured to acquire scheduling information of a network side, where the scheduling information includes an actual scheduling symbol number of the PDSCH;

the processor is also used for reading the program in the memory and executing the following processes:

the transceiver is further configured to transmit the first DMRS to the terminal according to the determined distribution position of the DMRS symbols.

Optionally, if the number of the preset scheduling symbols is not consistent with the number of the actual scheduling symbols, and the distribution position of the DMRS symbols is not on the scheduled symbols, the transceiver is further configured to not transmit DMRS other than the scheduled symbols.

Optionally, the processor is further configured to read the program in the memory, and execute any one of the following processes:

Optionally, the transceiver is further configured to receive terminal processing capability information of the terminal;

Optionally, the total data amount includes a total number of codewords included in the PDSCH and the number of layers.

Optionally, the first DMRS includes a preamble DMRS and an additional DMRS.

Optionally, the sending transmission point and the second sending transmission point are non-quasi co-located.

In a fourth aspect, an embodiment of the present invention further provides a terminal, including: a transceiver, a memory, a processor, and a program stored on the memory and executable on the processor; the transceiver is used for receiving a first DMRS of a PDSCH transmitted by a first sending transmission point and a second DMRS of the PDSCH transmitted by a second sending transmission point, the first DMRS and the second DMRS are consistent in position, and Code Division Multiplexing (CDM) groups to which the first DMRS and the second DMRS belong are different.

Optionally, the transceiver is further configured to receive information of CDM groups, which are not used for data transmission, of the first transmission point and the second transmission point.

Optionally, the transceiver is further configured to send terminal processing capability information to the first sending transmission point and the second sending transmission point, where the terminal processing capability information indicates a maximum data processing amount of the terminal.

In a fifth aspect, an embodiment of the present invention further provides an information processing apparatus, which is applied to a first transmission and transmission point, where the first transmission and transmission point and at least one second transmission and transmission point transmit a physical downlink shared channel PDSCH to a same terminal, and the apparatus includes:

an obtaining module, configured to obtain scheduling information of a network side and/or perform information interaction with the second transmission point, and obtain information of a second demodulation reference signal DMRS of a PDSCH transmitted by the second transmission point to the terminal;

and the transmission module is used for transmitting a first DMRS of the PDSCH to the terminal according to the information of the second DMRS, the first DMRS and the second DMRS are consistent in position, and Code Division Multiplexing (CDM) groups of the first DMRS and the second DMRS are different.

In a sixth aspect, an embodiment of the present invention further provides an information processing apparatus, which is applied to a terminal, and includes:

the receiving module is used for receiving a first DMRS of a PDSCH transmitted by a first sending transmission point and a second DMRS of the PDSCH transmitted by a second sending transmission point, wherein the first DMRS and the second DMRS are consistent in position, and Code Division Multiplexing (CDM) groups to which the first DMRS and the second DMRS belong are different.

In a seventh aspect, an embodiment of the present invention further provides a computer-readable storage medium for storing a program, where the program is executed by a processor to implement the steps in any information processing method as described above.

In the embodiment of the invention, a first sending transmission point acquires scheduling information of a network side and/or performs information interaction with a second sending transmission point to acquire information of a second DMRS of a PDSCH (physical downlink shared channel) transmitted to a terminal by the second sending transmission point, and then the first DMRS of the PDSCH can be transmitted to the terminal according to the information of the second DMRS, so that the first DMRS and the second DMRS are consistent in position, and Code Division Multiplexing (CDM) groups to which the first DMRS and the second DMRS belong are different.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments of the present invention will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without inventive exercise.

Fig. 1-4 are schematic diagrams illustrating multiplexing and configuration of DM-RS pilot types;

FIG. 5 is a flowchart of an information processing method according to an embodiment of the present invention;

FIG. 6 is a second flowchart of an information processing method according to an embodiment of the present invention;

FIG. 7 is a diagram of an information processing apparatus according to an embodiment of the present invention;

FIG. 8 is a second schematic diagram of an information processing apparatus according to a second embodiment of the present invention;

fig. 9 is a structural diagram of a transmission point according to an embodiment of the present invention;

fig. 10 is a structural diagram of a terminal according to an embodiment of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In order to improve coverage at the cell edge and provide more balanced service quality in the service area, multipoint cooperation is still an important technical means in an NR (New Radio) system. From the perspective of network morphology, the network deployment in a manner of centralized processing of a large number of distributed access points + baseband is more beneficial to providing a balanced user experience rate, and significantly reduces the time delay and signaling overhead caused by handover. With the increase of frequency bands, relatively dense deployment of access points is also required from the viewpoint of ensuring network coverage. In the high frequency band, as the integration level of the active antenna device is increased, the modularized active antenna array is more likely to be adopted. The antenna array of each TRP (Transmission Reception Point) may be divided into several relatively independent antenna panels, so that the form and port number of the whole array plane may be flexibly adjusted according to the deployment scenario and service requirements. And the antenna panels or TRPs can be connected by optical fibers, so that more flexible distributed deployment can be carried out. In the millimeter wave band, as the wavelength is reduced, the blocking effect generated by obstacles such as a human body or a vehicle is more remarkable. In this case, from the viewpoint of ensuring the link connection robustness, it is also possible to reduce the adverse effect of the blocking effect by performing transmission/reception from a plurality of beams at a plurality of angles by using cooperation between a plurality of TRPs or panels.

The coordinated multi-point transmission technique can be divided into coherent and non-coherent transmission according to the mapping relationship of the transmission signal stream to a plurality of TRPs and/or panels. Wherein, in coherent transmission, each data layer is mapped onto multiple TRPs and/or panels by means of a weighting vector. Whereas in non-coherent transmission, each data stream is mapped onto only a portion of the TRP and/or the panel. Coherent transmission has higher requirements on synchronization between transmission points and transmission capability of the backhaul link, and is thus sensitive to many non-ideal factors in real-world deployment conditions. Relatively speaking, the non-coherent transmission is less affected by the above factors, and therefore is an important consideration for the multi-point transmission technology.

The transmission may be performed in a single-PDCCH (Physical Downlink Shared Channel) manner in which a single PDSCH (Physical Downlink Control Channel) is scheduled by using a single PDCCH, or may be performed in a multi-PDCCH manner in which a plurality of PDCCHs are respectively scheduled by using corresponding PDSCHs.

For the single-PDCCH scheme, because the cooperation between transmission points is tighter, more ideal feedback link interaction CSI (Channel State Information) and control Information are needed. New codeword mapping schemes may be required to account for differences in channel conditions between transmission points or panels. For example, it can be considered to use 2 codewords below layer 4, and to match the channel conditions of different TRPs and/or panels with independent MCS (Modulation and Coding Scheme) respectively. It is even conceivable to use an unequal mapping scheme on the two codewords. For signals sent by different TRPs and/or panels, it is also necessary to group DM-RS (Demodulation reference signals) ports according to a QCL (Quasi Co-localized) relationship, indicate different QCL Information, and design a corresponding TCI (Tag Control Information) structure and Control signaling. In order to support the above enhancements, it may be necessary to redesign a DM-RS allocation manner in DCI (Downlink Control Information). In addition, an improvement on the CSI reporting method needs to be considered to support the handover between the unicast and the cooperative transmission.

For the multi-PDCCH mode, because the two PDSCHs are relatively independent from the transmission of the corresponding PDCCH, the mode is not sensitive to non-ideal factors such as the time delay of the backhaul link. Meanwhile, since each PDSCH may correspond to a different TRP and/or panel, independent transmission of multiple PDSCHs may avoid complexity in codeword mapping, DM-RS port grouping, TCI design, DM-RS port indication. It should be noted that although it is possible to consider using a fully flexible scheduling scheme between multiple PDSCHs, it is also necessary to consider quasi-static coordination between TRPs and/or panels to avoid interference between PDSCHs or DM-RS ports. Or the condition of partial overlapping between PDSCHs can be avoided through a certain coordination mechanism and scheduling limitation, so as to ensure the accuracy of receiver interference estimation and link self-adaption performance. When multiple PDSCHs are transmitted, the corresponding design of the uplink and downlink control channels and the design of the harq (hybrid Automatic Repeat request) hybrid Automatic Repeat request scheme are also contents that need to be studied.

Besides the eMBB (Enhanced Mobile Broadband service), the multi-point cooperation technology has a very important meaning for improving the reliability of URLLC (Ultra Reliable and Low Latency Communication) service transmission. For example, in the high frequency band, the blocking effect may cause a temporary interruption of communication. In this case, the probability of the signal being blocked can be reduced by the cooperative transmission of multiple TRPs and/or panels. Furthermore, the reliability of the transmission can be improved by repeated or diversity transmission of multiple TRPs and/or panels.

The DM-RS port is multiplexed by FDM (Frequency-division multiplexing, Frequency division multiplexing) + CDM (code division multiplexing). Within each CDM group, the CDM group is divided into a plurality of ports by OCC (Orthogonal Code division multiplexing), and is distinguished from the CDM group by FDM. NR supports two pilot types, the pilot type used being configured by higher layer signaling. The multiplexing and configuration of the two pilot types is described in detail as follows:

DM-RS pilot type 1 is shown in fig. 1 and 2:

as shown in fig. 1, when a single OFDM symbol is used, two groups of frequency-divided comb resources are provided, and at most 4 ports are supported, wherein each group of comb resources supports 2-port multiplexing by an OCC method;

as shown in fig. 2, when there are two OFDM symbols, a maximum of 8 ports are supported, wherein each OFDM symbol can support 4 ports.

DM-RS pilot type 2 is shown in fig. 3 and 4:

as shown in fig. 3, when a single OFDM symbol is used, OFDM subcarriers of one OFDM are divided into three groups, each group is composed of two adjacent subcarriers, FDM multiplexing among subcarrier groups is horizontal, and at most 6 ports are supported, wherein each group of resources supports 2-port multiplexing by an OCC method;

as shown in fig. 4, in case of a dual OFDM symbol, a maximum of 4 orthogonal ports are supported in each CDM group, and thus a maximum of 12 ports are supported in 3 CDM groups.

In medium and/or high speed scenarios, more DM-RS symbols need to be inserted within the scheduling duration in addition to the preamble DM-RS to meet the estimation accuracy for the time-varying channel. The NR system adopts a structure of combining a front DM-RS and an additional DM-RS with configurable time domain density. The pattern of each set of additional DM-RS is a repetition of the preamble DM-RS. Thus, each additional set of DM-RS may occupy at most two consecutive DM-RS symbols, consistent with the preamble DM-RS. Depending on the specific usage scenario and mobility, up to three additional sets of DM-RSs may be configured at each schedule. The number of additional DM-RSs depends on the higher layer parameter configuration and the specific scheduling duration. Regarding the location of the additional DM-RS, the following principles are mainly considered in the design process:

(1) as uniform a time domain distribution as possible to ensure that each symbol has as equalized a channel estimation accuracy as possible.

(2) Under the condition of different scheduling durations, the positions of the DM-RS symbols are as same as possible, so that the situation that a channel estimator needs to consider can be reduced. For example, for the case of configuring 1 preamble DM-RS symbol, when the number of scheduling persistent symbols is 8 and 9, the additional DM-RS is present on the 8 th OFDM symbol of the slot when PDSCH mapping type a; when the number of the scheduling persistent symbols is 10-12, if 1 additional DM-RS is configured, they all appear at the 9 th symbol, and if 2 additional DM-RS are configured, they all appear at the 6 th and 9 th symbols, respectively.

(3) The main reason to avoid the last symbol of the scheduling region is to reduce the influence of channel estimation on the detection delay as much as possible.

Wherein the time domain position of the DMRS is determined by the following parameters:

(1) starting position of preamble DMRS

For type A scheduling: starting from the 3 rd or 4 th symbol of slot according to the configuration of high layer signaling;

for type B scheduling: starting with the first symbol of the schedule.

(2) Number of symbols of preamble DMRS: configured by higher layer signaling, may be 1 or 2 symbols.

(3) Number of groups of additional DMRS: can be configured to be 0, 1, 2, 3 by higher layer signaling. The number of symbols of each group of additional DMRS is consistent with the number of configured pre-DMRS symbols. The number of additional DMRS groups that can be actually transmitted depends on parameters such as the actual scheduling length and the starting position of the preamble DMRS.

Specific DMRS symbol positions are shown in tables 1 and 2, where table 1 is the case of a single pre-DMRS symbol and table 2 is the case of two pre-DMRS symbols.

TABLE 1 DMRS location at single DMRS symbol

TABLE 2 DMRS positions at two DMRS symbols

Quasi co-location means that the large scale parameters of the channel experienced by a symbol on one antenna port can be inferred from the channel experienced by a symbol on another antenna port. The large-scale parameters may include delay spread, average delay, doppler spread, doppler shift, average gain, and spatial reception parameters.

The concept of QCL is introduced with the advent of CoMP (Coordinated Multiple Point transmission) technology. The multiple sites involved in CoMP transmission may correspond to multiple sites with different geographical locations or multiple sectors with different antenna panel orientations. For example, when a terminal receives data from different stations, the spatial difference of the stations may cause the difference of large-scale channel parameters of receiving links from different stations, such as doppler frequency offset, delay spread, and the like. The large-scale parameters of the channel directly affect the adjustment and optimization of the filter coefficients during channel estimation, and different channel estimation filtering parameters should be used to adapt to the corresponding channel propagation characteristics corresponding to signals sent by different stations.

Therefore, although the difference in spatial position or angle between the stations is transparent to the UE (User Equipment) and CoMP operation itself, the influence of the spatial difference on the large-scale parameters of the channel is an important factor to be considered when the UE performs channel estimation and reception detection. By QCL for two antenna ports in the sense of certain large scale parameters, it is meant that these large scale parameters for the two ports are the same. Alternatively, the terminal may consider two ports to originate from the same location (i.e., quasi co-site) as long as some of the large scale parameters of the two ports are consistent, regardless of differences in their actual physical locations or corresponding antenna panel orientations.

For some typical application scenarios, considering possible QCL relationships between various reference signals, from the perspective of simplified signaling, the NR divides several large-scale parameters of channels into the following 4 types, which facilitates configuration and/or indication of the system according to different scenarios:

(1) QCL-TypeA { Doppler frequency Shift, Doppler spread, average delay, delay spread }

Except for the spatial reception parameter, the other large-scale parameters are the same.

For frequency bands below 6GHz, spatial reception parameters may not be required.

(2) QCL-TypeB: { Doppler frequency Shift, Doppler spread }

Only for the following two cases of the frequency band below 6GHz

Case (example) 1: when a narrow-beam reference signal is used, the wide-beam reference signal may be a QCL reference. For example, TRS (Tracking Reference Signal) is typically transmitted with a wide beam at the sector level, whereas CSI-RS (Reference Signal) may be transmitted with a narrow beam. In this case, it is generally assumed that the doppler parameters experienced by signals transmitted from the same site are still approximately consistent. However, the scatterers covered by the beams with different widths are different, and therefore, the scatterers have a significant influence on the delay spread and the average delay parameter experienced by the signal propagation. In this case, the QCL cannot be assumed in the sense of delay spread and average delay parameters for CSI-RS and TRS.

Case 2: the time domain density of the target reference signal is insufficient, but the frequency domain density is sufficient. For example, with the TRS as the QCL reference for the CSI-RS, the Doppler parameters may be obtained from the TRS with which the QCL is associated, since the time-domain density of the CSI-RS may not be sufficient to accurately estimate the Doppler parameters of the channel, depending on the configuration. On the other hand, the frequency domain density of the CSI-RS is enough for estimating frequency domain parameters such as average delay and delay spread, so that the parameters can be obtained from the CSI-RS.

(3) QCL-TypeC: { Doppler frequency shift, average time delay }

The QCL reference is only applied to the SSB (Synchronization Single Block) in the frequency band above 6 GHz. Because the SSB has limited resources and density, it is generally assumed that only some relatively coarse large-scale information, i.e., doppler shift and average delay, can be obtained from the SSB, while other large-scale parameters need to be obtained from the target reference signal itself.

(4) QCL-TypeD { space reception parameter }

As mentioned before, since this parameter is mainly for the frequency band above 6GHz, it is regarded as one QCL type alone.

Existing protocols specify that DMRS ports within each CDM group are QCL.

For the scheduling scheme in multi-PDCCH based multipoint transmission, there are three candidates as follows:

mode 1: flexible scheduling, i.e. each PDCCH is allowed to perform resource scheduling independently;

mode 2: the method does not allow the PDSCH resources scheduled by each PDCCH to have partial overlapping, namely the PDSCH resources are either completely overlapped or not overlapped;

mode 3: flexible scheduling is allowed, but the following restrictions on the transmission of DMRS are required:

DMRS parameters of each PDSCH need to be kept uniform: the method specifically comprises the steps of acquiring the actual number of pre-DMRS symbols, the actual number of additional DMRS symbols, the position of the DMRS symbols and the DMRS configuration type;

DMRS ports in the same CDM group are QCL;

scheduling information of each PDSCH is indicated only by the corresponding PDCCH.

When the multi-PDCCH is used, the interference between DMRSs of two PDSCHs and the interference between DMRS of one PDSCH and data of another PDSCH need to be considered.

To address this problem, the same DMRS type, pre-DMRS symbol position, pre-DMRS symbol number, and additional DMRS number may be configured for DMRSs in one UE receiving two PDSCHs, while constraining DMRSs of different PDSCHs not to use the same CDM group. In this case, if the DMRS symbol positions of the two PDSCHs can be guaranteed to be the same, there may be no interference between the DMRSs of the two PDSCHs (in this case, there is an FDM relationship between the DMRSs of the different PDSCHs). Meanwhile, if the CDM group occupied by the DMRS of another PDSCH can be left empty in each PDSCH without being used for data transmission, it can be further ensured that the data of the PDSCH does not interfere with the DMRS of another PDSCH.

The multi-PDCCH is mainly used in the case where backhaul conditions are less than ideal. In this case, it is difficult to perform more dynamic coordination on the transmission of the PDSCH. Therefore, the problems with the above approach include:

how the DMRS symbol positions from different PDSCHs are consistent, for type a scheduling, when other parameters configured through higher layer signaling are consistent, the actual positions of the additional DMRS symbols ultimately also depend on the number of scheduling symbols of the PDSCH. Therefore, when the number of scheduling symbols of the two type a PDSCHs is not consistent, it cannot be guaranteed that the actual symbol positions of the additional DMRSs of the two PDSCHs are consistent. When at least one PDSCH is type B scheduled, it is more difficult to guarantee the same DMRS symbol position since the start and end positions of its scheduling cannot be pre-configured.

How to allocate CDM groups to which DMRSs from different PDSCHs belong, existing DMRS port allocation is dynamically performed according to DCI indication, and in this case, there is no scheme to guarantee that different PDSCHs occupy different CDM groups.

In addition, no scheme is available to avoid interference between the DMRS of one PDSCH and data of other PDSCHs, and if the DMRS symbol positions of the PDSCHs can be kept consistent and the CDM group occupied by the DMRS of another PDSCH can be left empty in each PDSCH without being used for data transmission, it can be ensured that the data of the PDSCH does not cause interference to the DMRS of another PDSCH. However, on the premise of lacking dynamic coordination capability, there is no scheme that can know the CDM group where DMRSs of other PDSCHs are located.

In order to solve the above problem, embodiments of the present invention provide an information processing method, an information processing apparatus, a communication device, and a computer-readable storage medium, which are used to solve the problem of interference between DMRSs of PDSCHs when multiple PDSCHs are scheduled by multiple PDCCHs.

An embodiment of the present invention provides an information processing method, which is applied to a first sending transmission point, where the first sending transmission point and at least one second sending transmission point transmit a physical downlink shared channel PDSCH to the same terminal, as shown in fig. 5, where the method includes:

step 101: acquiring scheduling information of a network side and/or performing information interaction with the second sending transmission point, and acquiring information of a second demodulation reference signal (DMRS) of the PDSCH transmitted to the terminal by the second sending transmission point;

step 102: and transmitting a first DMRS of the PDSCH to the terminal according to the information of the second DMRS, wherein the first DMRS is consistent with the second DMRS in position, and the Code Division Multiplexing (CDM) groups of the first DMRS and the second DMRS are different.

In this embodiment, the first transmission point acquires scheduling information on the network side and/or performs information interaction with the second transmission point to acquire information on a second DMRS of a PDSCH transmitted to the terminal by the second transmission point, and then may transmit the first DMRS of the PDSCH to the terminal according to the information on the second DMRS, so that the first DMRS and the second DMRS are at the same position, and CDM groups to which the first DMRS and the second DMRS belong are different.

Optionally, the method specifically includes:

transmitting the first DMRS to the terminal with the first CDM group.

Optionally, the method specifically includes:

Optionally, the method further includes:

Optionally, the method specifically includes:

Optionally, the method further includes:

receiving terminal processing capacity information of the terminal;

Optionally, the first DMRS includes a preamble DMRS and an additional DMRS.

An embodiment of the present invention further provides an information processing method, applied to a terminal, as shown in fig. 6, including:

step 201: and receiving a first DMRS of the PDSCH transmitted by a first sending transmission point and a second DMRS of the PDSCH transmitted by a second sending transmission point, wherein the first DMRS and the second DMRS are consistent in position, and Code Division Multiplexing (CDM) groups to which the first DMRS and the second DMRS belong are different.

In this embodiment, the first DMRS of the PDSCH transmitted by the first transmission point to the terminal is located at the same position as the second DMRS of the PDSCH transmitted by the first transmission point to the terminal, and CDM groups to which the first DMRS and the second DMRS belong are different.

Optionally, the method further includes:

The following specific embodiments are described in detail with reference to the accompanying drawings.

In the technical scheme of the invention, in order to solve the problem of interference between DMRS of each PDSCH when multiple PDSCHs are scheduled by multiple PDCCHs, DMRS parameters of each PDSCH transmitted to the same terminal need to be kept uniform, and the DMRS parameters specifically comprise the actual number of preposed DMRS symbols, the actual number of additional DMRS symbols, the position of the DMRS symbols and the DMRS configuration type; and the CDM groups to which the DMRSs of different PDSCHs belong are different, or the DMRS ports in the same CDM group are QCL, or the DMRS ports in the same CDM group only have one TCI state.

In order to realize that the DMRS parameters of each PDSCH transmitted to the same terminal are uniform and the DMRSs of different PDSCHs belong to different CDM groups, the TRPs/panels participating in cooperation should perform information interaction (e.g., exchange scheduling information) between TRPs/panels serving the same terminal or the network side should schedule the TRPs/panels participating in cooperation.

In a specific example, interacting between the TRPs/panels participating in the cooperation to acquire DMRS information of PDSCHs of TRPs/panels other than the TRPs/panels themselves, including DMRS positions and CDM groups used by the DMRS, may control the DMRS of the PDSCH transmitted to the terminal according to the DMRS information of the PDSCHs of other TRPs/panels, so that the DMRS position of the PDSCH transmitted to the terminal by itself is consistent with the DMRS position of the PDSCH transmitted to the terminal by other TRPs/panels, and the CDM groups to which the DMRS positions belong are different.

In another specific example, the network side schedules all TRP/panels participating in the cooperation, configures the same DMRS position for all TRP/panels, and allocates different CDM groups for different TRP/panels, so that the TRP/panels participating in the cooperation can control the DMRS of the PDSCH sent to the terminal according to the scheduling information, so that the DMRS position of the PDSCH sent to the terminal by itself is consistent with the DMRS positions of the PDSCHs sent to the terminal by other TRP/panels, and the assigned CDM groups are different.

In a specific embodiment, in order to make DMRSs of PDSCHs sent by different TRPs belong to different CDM groups, all TRPs participating in cooperation obtain a CDM group that can be used by a DMRS of a PDSCH of each TRP (including itself and other TRPs), that is, a CDM group allocated to a DMRS of a PDSCH of each TRP, through information interaction between TRPs, or network side configuration or according to a default order, each TRP, when transmitting a PDSCH, leaves a CDM group occupied by a DMRS of another PDSCH empty and is not used for data transmission, thereby ensuring that data of a PDSCH transmitted by itself does not cause interference to DMRSs of another PDSCH. In addition, each TRP may inform a terminal which CDM groups are not used for data transmission in DCI corresponding to a PDSCH it transmits.

Or the network side can restrict that each TRP transmitted PDSCH only contains one code word, and one CDM group (4 layers in each CDM group at most) corresponding to each TRP transmitted PDSCH DMRS is designated or determined in a default mode.

In a specific embodiment, in order to make the DMRS positions of the PDSCHs transmitted by different TRPs consistent, that is, the DMRS types, the pre-DMRS symbol positions, the number of pre-DMRS symbols, and the number of additional DMRS of the PDSCHs transmitted by different TRPs are all the same, the scheduling length (i.e., the number of scheduled symbols) of the PDSCH transmitted by TRP may be configured and/or indicated.

Specifically, the network side may semi-statically configure the scheduling length of the PDSCH for the TRP participating in the cooperation (applicable to non-ideal backhaul), may dynamically indicate the scheduling length of the PDSCH of each TRP (applicable to ideal backhaul), may preconfigure or stipulate the scheduling length of the PDSCH of each TRP in advance through a protocol, and when the terminal receives the PDSCHs sent by multiple TRPs, it may assume that the scheduling lengths are the same.

In addition, a DMRS position table may be preset, where the DMRS position table includes a correspondence between preset scheduling symbol numbers of the PDSCH and DMRS symbol positions, and the DMRS position table is shown in tables 3 and 4. Table 3 shows the position distribution of a single DMRS symbol, and table 4 shows the position distribution of two DMRS symbols.

TABLE 3 DMRS location at single DMRS symbol

TABLE 4 DMRS location at two DMRS symbols

When the DMRS is generated, the actual scheduling symbol number of the PDSCH of the TRP participating in cooperation is assumed to be default or the value l of high-layer signaling configuration_d(e.g., assume l _d14 symbols), i.e., the scheduling length of the PDSCH, the default l may be determined according to the default l_dAnd other parameters in table 3 or table 4, as well as the actual number of scheduling symbols, determine the location of the DMRS symbols.

In a specific example, when a single DMRS symbol is configuredAssuming that the actual number of scheduling symbols of PDSCH of TRP participating in cooperation is default or l is a value configured by high-layer signaling_dThe possible locations of DMRS are shown in table 3 with underlined values, 12 symbols. The actual position of the DMRS symbols depends on the number of actual scheduling symbols, except for the number of additional DMRS groups configured by the higher layer, and the DMRS is transmitted only if possible DMRS positions are within the range of the scheduled symbols, and is not transmitted except for the scheduling symbols if the possible DMRS symbols are not on the scheduled symbols.

In another specific example, when two DMRS symbols are configured, it is assumed that the actual number of scheduling symbols of PDSCH of the TRP participating in cooperation is default or is a value l configured by higher layer signaling_dThe possible locations of DMRS are shown in table 4 with underlined values, 14 symbols. The actual position of the DMRS symbols depends on the actual number of scheduling symbols, in addition to the number of additional DMRS groups configured by higher layers. The DMRS is transmitted only when the possible DMRS positions are within the range of the scheduled symbols, and DMRSs other than the scheduled symbols are not transmitted if the possible positions of the DMRS symbols are not on the scheduled symbols.

In addition, the terminal does not expect that the total number of codewords, the number of layers, and other values included in all PDSCHs transmitted to the same terminal by each TRP exceed the processing capability of the terminal, and therefore, the terminal may report the terminal processing capability information to the network side in advance, including the maximum data amount that the terminal can process.

The network side can schedule each TRP participating in cooperation, so that the maximum number of code words and the maximum number of layers contained in a PDSCH sent by each TRP are respectively a preset numerical value, and the total number of code words and the total number of layers do not exceed the processing capacity of the terminal.

In the case of transmitting only one PDSCH, the network side may not define a CDM group to which the DMRS of the PDSCH transmitted by one TRP belongs. However, the number of codes and the number of layers used for PDSCH transmission cannot exceed the processing capability of the terminal.

An embodiment of the present invention further provides an information processing apparatus, which is applied to a first transmission point, where the first transmission point and at least one second transmission point transmit a PDSCH (physical downlink shared channel) to a same terminal, as shown in fig. 7, and the apparatus includes:

an obtaining module 31, configured to obtain scheduling information of a network side and/or perform information interaction with the second transmission point, and obtain information of a second demodulation reference signal DMRS of a PDSCH transmitted by the second transmission point to the terminal;

and a transmission module 32, configured to transmit a first DMRS of the PDSCH to the terminal according to information of the second DMRS, where the first DMRS is located at the same position as the second DMRS, and Code Division Multiplexing (CDM) groups to which the first DMRS and the second DMRS belong are different.

In this embodiment, a first transmission point acquires scheduling information of a network side and/or performs information interaction with a second transmission point to acquire information of a second DMRS of a PDSCH transmitted by the second transmission point to a terminal, and then may transmit a first DMRS of the PDSCH to the terminal according to the information of the second DMRS, so that the first DMRS and the second DMRS are located at the same position, and CDM groups to which the first DMRS and the second DMRS belong are different.

Optionally, the obtaining module 31 is specifically configured to receive scheduling information of a network side, where the scheduling information indicates at least one first CDM group allocated to the first transmission point, and the first CDM group is different from a second CDM group allocated to the second transmission point by the network side;

the transmission module 32 is specifically configured to transmit the first DMRS to the terminal by using the first CDM group.

Optionally, the obtaining module 31 is specifically configured to perform information interaction with the second sending transmission point, and obtain a second CDM group used by the second sending transmission point to send the second DMRS;

the transmitting module 32 is specifically configured to transmit the first DMRS to the terminal with a first CDM group that is different from the second CDM group.

Optionally, the transmission module 32 is further configured to send information of a CDM group, which is not used for data transmission, to the terminal.

Optionally, the obtaining module 31 is specifically configured to obtain scheduling information of a network side, where the scheduling information includes an actual number of scheduling symbols of the PDSCH; acquiring the number of preset scheduling symbols of the PDSCH, and determining the distribution positions of DMRS symbols according to the number of the preset scheduling symbols, the actual scheduling symbols of the PDSCH and a preset DMRS position table, wherein the preset DMRS position table comprises the corresponding relation between the number of the preset scheduling symbols of the PDSCH and the positions of the DMRS symbols;

the transmission module 32 is specifically configured to transmit the first DMRS to the terminal according to the determined distribution position of the DMRS symbols.

Optionally, if the preset number of the scheduling symbols is inconsistent with the actual number of the scheduling symbols, and the distribution position of the DMRS symbols is not on the scheduled symbols, the transmission module 32 is further configured to not transmit the DMRS other than the scheduled symbols.

Optionally, the obtaining module 31 is specifically configured to execute any one of the following:

acquiring the preset scheduling symbol number of the PDSCH configured by a network side through bottom layer signaling;

Optionally, the obtaining module 31 is further configured to receive terminal processing capability information of the terminal;

the transmission module 32 is further configured to control, according to the terminal processing capability information, that a total data amount of the PDSCH transmitted to the terminal does not exceed a maximum data processing amount indicated by the terminal processing capability information.

Optionally, the first DMRS includes a preamble DMRS and an additional DMRS.

The working principle of the device can be referred to the description of the embodiment of the method.

An embodiment of the present invention further provides an information processing apparatus, which is applied to a terminal, and as shown in fig. 8, includes:

a receiving module 41, configured to receive a first DMRS of a PDSCH transmitted by a first transmission point and a second DMRS of a PDSCH transmitted by a second transmission point, where the first DMRS and the second DMRS are located at the same position, and Code Division Multiplexing (CDM) groups to which the first DMRS and the second DMRS belong are different.

Optionally, the receiving module 41 is further configured to receive information of CDM groups, which are not used for data transmission, of the first transmission point and the second transmission point.

Optionally, the receiving module 41 is further configured to send terminal processing capability information to the first sending transmission point and the second sending transmission point, where the terminal processing capability information indicates a maximum data processing amount of the terminal.

An embodiment of the present invention further provides a sending transmission point, which transmits a physical downlink shared channel PDSCH to the same terminal with at least one second sending transmission point, as shown in fig. 9, where the sending transmission point includes: a transceiver 510, a memory 520, a processor 500, and a program stored on the memory and executable on the processor; the transceiver 510 is configured to acquire scheduling information of a network side and/or perform information interaction with the second transmission point, and acquire information of a second demodulation reference signal DMRS of a PDSCH transmitted by the second transmission point to the terminal; and transmitting a first DMRS of the PDSCH to the terminal according to the information of the second DMRS, wherein the first DMRS is consistent with the second DMRS in position, and the Code Division Multiplexing (CDM) groups of the first DMRS and the second DMRS are different.

In this embodiment, the sending transmission point acquires scheduling information of the network side and/or performs information interaction with the second sending transmission point to acquire information of a second DMRS of a PDSCH transmitted by the second sending transmission point to the terminal, and then may transmit the first DMRS of the PDSCH to the terminal according to the information of the second DMRS, so that the first DMRS and the second DMRS are located at the same position, and CDM groups to which the first DMRS and the second DMRS belong are different.

In fig. 9, among other things, the bus architecture may include any number of interconnected buses and bridges, with one or more processors, represented by processor 500, and various circuits, represented by memory 520, being linked together. The bus architecture may also link together various other circuits such as peripherals, voltage regulators, power management circuits, and the like, which are well known in the art, and therefore, will not be described any further herein. The bus interface provides an interface. The transceiver 510 may be a number of elements including a transmitter and a receiver that provide a means for communicating with various other apparatus over a transmission medium. For different user devices, the user interface 530 may also be an interface capable of interfacing with a desired device externally, including but not limited to a keypad, display, speaker, microphone, joystick, etc.

The processor 500 is responsible for managing the bus architecture and general processing, and the memory 520 may store data used by the processor 500 in performing operations.

Optionally, the transceiver 510 is specifically configured to receive scheduling information on a network side, where the scheduling information indicates at least one first CDM group allocated to the transmission point, where the first CDM group is different from a second CDM group allocated to the second transmission point on the network side; transmitting the first DMRS to the terminal with the first CDM group.

Optionally, the transceiver 510 is specifically configured to perform information interaction with the second sending transmission point, and acquire a second CDM group used by the second sending transmission point to send the second DMRS; transmitting the first DMRS to the terminal with a first CDM group different from the second CDM group.

Optionally, the transceiver 510 is further configured to send information of a CDM group, which is not used for data transmission, to the terminal.

Optionally, the transceiver 510 is specifically configured to acquire scheduling information of a network side, where the scheduling information includes an actual scheduling symbol number of the PDSCH;

the processor 500 is further configured to read a program in the memory, and perform the following processes:

the transceiver 510 is further configured to transmit the first DMRS to the terminal according to the determined distribution positions of the DMRS symbols.

Optionally, if the number of the preset scheduling symbols is not consistent with the number of the actual scheduling symbols, and the distribution position of the DMRS symbols is not on the scheduled symbols, the transceiver 510 is further configured to not transmit DMRS other than the scheduled symbols.

Optionally, the processor 500 is further configured to read a program in the memory, and execute any one of the following processes:

Optionally, the transceiver 510 is further configured to receive terminal processing capability information of the terminal;

Optionally, the first DMRS includes a preamble DMRS and an additional DMRS.

An embodiment of the present invention further provides a terminal, as shown in fig. 10, including: a transceiver 610, a memory 620, a processor 600, and a program stored on the memory 620 and executable on the processor 600; the transceiver 610 is configured to receive a first DMRS of a PDSCH transmitted by a first transmission point and a second DMRS of a PDSCH transmitted by a second transmission point, where the first DMRS and the second DMRS are located at the same position, and Code Division Multiplexing (CDM) groups to which the first DMRS and the second DMRS belong are different.

Optionally, the transceiver 610 is further configured to receive information of CDM groups, which are not used for data transmission, of the first transmission point and the second transmission point.

Optionally, the transceiver 610 is further configured to send terminal processing capability information to the first sending transmission point and the second sending transmission point, where the terminal processing capability information indicates a maximum data processing amount of the terminal.

An embodiment of the present invention further provides a computer-readable storage medium for storing a program, where the program, when executed by a processor, implements the steps in any of the information processing methods described above.

In the embodiments provided in the present invention, it should be understood that the disclosed method and apparatus can be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units is only one logical division, and other divisions may be realized in practice, 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. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.

In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may be physically included alone, or two or more units may be integrated into one unit. The integrated unit can be realized in a form of hardware, or in a form of hardware plus a software functional unit.

The integrated unit implemented in the form of a software functional unit may be stored in a computer readable storage medium. The software functional unit is stored in a storage medium and includes several instructions to enable a computer device (which may be a personal computer, a server, or a network device) to execute some steps of the transceiving method according to various embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a portable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other media capable of storing program codes.

While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined in the appended claims.

Claims

1. An information processing method is applied to a first sending transmission point, and the first sending transmission point and at least one second sending transmission point transmit a Physical Downlink Shared Channel (PDSCH) to the same terminal, and is characterized by comprising the following steps:

acquiring scheduling information of a network side and/or performing information interaction with the second sending transmission point, and acquiring information of a second demodulation reference signal (DMRS) of a Physical Downlink Shared Channel (PDSCH) which is transmitted to the terminal by the second sending transmission point;

transmitting a first DMRS of a PDSCH to the terminal according to the information of the second DMRS, wherein the first DMRS is consistent with the second DMRS in position, the Code Division Multiplexing (CDM) groups of the first DMRS and the second DMRS are different, and the CDM group of the second DMRS is vacant;

the method further comprises the following steps:

2. The information processing method according to claim 1, wherein the method specifically includes:

transmitting the first DMRS to the terminal with the first CDM group.

3. The information processing method according to claim 1, wherein the method specifically includes:

performing information interaction with the second transmitting transmission point to acquire a second CDM group used by the second transmitting transmission point for transmitting the second DMRS;

4. The information processing method according to claim 1, wherein the method specifically comprises:

5. The information processing method according to claim 4, wherein if the preset number of scheduling symbols is not identical to the actual number of scheduling symbols, and the distribution position of DMRS symbols is not on the scheduled symbols, the DMRS other than the scheduled symbols is not transmitted.

6. The information processing method according to claim 4, wherein the obtaining of the preset number of scheduling symbols for the PDSCH comprises any one of:

7. The information processing method according to claim 1, further comprising:

receiving terminal processing capacity information of the terminal;

8. The information processing method according to claim 7, wherein the total data amount includes a total number of codewords and the number of layers included in the PDSCH.

9. The information processing method of claim 1, wherein the first DMRS comprises a preamble DMRS and an additional DMRS.

10. The information processing method of claim 1, wherein the first transmission point and the second transmission point are non-quasi co-located.

11. An information processing method applied to a terminal is characterized by comprising the following steps:

receiving a first DMRS of a PDSCH transmitted by a first transmitting transmission point and a second DMRS of the PDSCH transmitted by a second transmitting transmission point, wherein the first DMRS is consistent with the second DMRS in position, the Code Division Multiplexing (CDM) groups to which the first DMRS and the second DMRS belong are different, and the CDM group to which the second DMRS belongs is vacant;

further comprising:

12. The information processing method according to claim 11, further comprising:

13. A transmission point and at least one second transmission point transmit a Physical Downlink Shared Channel (PDSCH) to the same terminal, the transmission point comprising: a transceiver, a memory, a processor, and a program stored on the memory and executable on the processor; it is characterized in that the preparation method is characterized in that,

the transceiver is configured to acquire scheduling information of a network side and/or perform information interaction with the second transmission point, and acquire information of a second demodulation reference signal DMRS of a PDSCH transmitted by the second transmission point to the terminal; transmitting a first DMRS of a PDSCH to the terminal according to the information of the second DMRS, wherein the first DMRS is consistent with the second DMRS in position, the Code Division Multiplexing (CDM) groups of the first DMRS and the second DMRS are different, and the CDM group of the second DMRS is vacant;

the transceiver is also configured to transmit information of a CDM group, which is not used for data transmission, to the terminal.

14. The transmitting transmission point of claim 13, wherein the transceiver is configured to receive scheduling information from a network side, the scheduling information indicating at least one first CDM group assigned to the transmitting transmission point, the first CDM group being different from a second CDM group assigned to the second transmitting transmission point from the network side; transmitting the first DMRS to the terminal with the first CDM group.

15. The transmitting transmission point of claim 13, wherein the transceiver is specifically configured to perform information interaction with the second transmitting transmission point to obtain a second CDM group used by the second transmitting transmission point to transmit the second DMRS; transmitting the first DMRS to the terminal with a first CDM group different from the second CDM group.

16. The tx transmission point of claim 13, wherein the transceiver is configured to obtain scheduling information on the network side, and the scheduling information comprises an actual number of scheduling symbols of the PDSCH;

17. The transmitting transmission point of claim 16, wherein the transceiver is further configured to not transmit the DMRS other than the scheduled symbol if the preset number of the scheduling symbols is not identical to the actual number of the scheduling symbols and the DMRS symbol is not distributed on the scheduled symbol.

18. The transmitting transmission point of claim 16, wherein the processor is further configured to read a program in the memory to perform any of the following:

19. The transmitting transmission point of claim 13, wherein the transceiver is further configured to receive terminal processing capability information of the terminal;

20. The transmit transmission point of claim 19, wherein the total amount of data comprises a total number of codewords and a number of layers included in the PDSCH.

21. The transmitting transmission point of claim 13, wherein the first DMRS comprises a preamble DMRS and an additional DMRS.

22. The transmitting transmission point of claim 13, wherein the transmitting transmission point is non-quasi co-located with the second transmitting transmission point.

23. A terminal, comprising: a transceiver, a memory, a processor, and a program stored on the memory and executable on the processor; it is characterized in that the preparation method is characterized in that,

the transceiver is used for receiving a first DMRS of a PDSCH transmitted by a first transmitting transmission point and a second DMRS of a PDSCH transmitted by a second transmitting transmission point, wherein the first DMRS and the second DMRS are consistent in position, Code Division Multiplexing (CDM) groups to which the first DMRS and the second DMRS belong are different, and the CDM groups to which the second DMRS belongs are left vacant;

the transceiver is further configured to receive information of CDM groups of the first and second transmit transmission points that are not used for data transmission.

24. The terminal of claim 23, wherein the transceiver is further configured to send terminal processing capability information to the first transmission point and the second transmission point, wherein the terminal processing capability information indicates a maximum data throughput of the terminal.

25. An information processing apparatus applied to a first transmission point, where the first transmission point and at least one second transmission point transmit a Physical Downlink Shared Channel (PDSCH) to a same terminal, the apparatus comprising:

a transmission module, configured to transmit a first DMRS of a PDSCH to the terminal according to information of the second DMRS, where the first DMRS is located at the same position as the second DMRS, and Code Division Multiplexing (CDM) groups to which the first DMRS and the second DMRS belong are different, and leave the CDM group to which the second DMRS belongs open;

the transmission module is further configured to send, to the terminal, information of a CDM group that is not used for data transmission.

26. An information processing apparatus applied to a terminal, comprising:

a receiving module, configured to receive a first DMRS of a PDSCH transmitted by a first transmission point and a second DMRS of a PDSCH transmitted by a second transmission point, where the first DMRS and the second DMRS are at the same position, and code division multiplexing, CDM, groups to which the first DMRS and the second DMRS belong are different, and leave the CDM group to which the second DMRS belongs open;

the receiving module is further configured to receive information of a CDM group, which is not used for data transmission, of the first transmission point and the second transmission point.

27. A computer-readable storage medium storing a program, wherein the program when executed by a processor implements the steps in the method of any one of claims 1 to 10; or,

the program when executed by a processor implementing the steps in the method of any one of claims 11 to 12.