CN105792373B

CN105792373B - Interference information indication method, interference suppression method and device

Info

Publication number: CN105792373B
Application number: CN201410818590.9A
Authority: CN
Inventors: 陈润华; 沈祖康; 黄秋萍
Original assignee: China Academy of Telecommunications Technology CATT
Current assignee: China Academy of Telecommunications Technology CATT; Datang Mobile Communications Equipment Co Ltd
Priority date: 2014-12-24
Filing date: 2014-12-24
Publication date: 2020-11-06
Anticipated expiration: 2034-12-24
Also published as: CN105792373A

Abstract

The invention discloses an interference information indicating method, an interference suppression method and an interference suppression device. The method comprises the following steps: determining a first User Equipment (UE) and a second UE, wherein intra-cell interference or inter-cell interference exists between the first UE and the second UE; and indicating interference information to the first UE through dynamic signaling or semi-static signaling so that the first UE performs interference suppression on a signal of the second UE according to the interference information. By adopting the method, the network side can obtain the interference information related to the second UE and further send the interference information to the first UE, so that the first UE can carry out interference suppression on the signal of the second UE according to the interference information.

Description

Interference information indication method, interference suppression method and device

Technical Field

The present invention relates to the field of communications, and in particular, to an interference information indication method, an interference suppression method, and an apparatus.

Background

A major performance limiting factor in wireless cellular communication systems is interference. There are two sources of interference, intra-cell interference (i.e., intra-cell interference) and inter-cell interference (i.e., inter-cell interference).

The inter-cell interference is caused by that the base station of the neighboring cell schedules (schedule) other UEs (User Equipment for short) of the neighboring cell under the same frequency. When there is no coordinated multi-point (COMP) cell cooperation in different cells, the inter-cell interference has a large influence on the UE at the cell edge.

The intra-cell interference mainly comes from Multi-User Multiple-input Multiple-Output (MU-MIMO) paired UEs. MU-MIMO is an important transmission method in Long term evolution (LET) system. In one cell, one eNB (base station) may schedule multiple UEs to transmit or transmit on the same time and/or frequency domain resource, forming a UE pair. In a UE pair, different beamforming (in english: beamforming) is used for different UEs, and multiple access is implemented by using different positions of the UEs in the space domain. Intra-cell interference may be reduced if the channel orthogonality of one UE's beamforming matrix with another UE is good.

The MU-MIMO technology of the existing system is implemented based on network side (such as eNB) scheduling, and a UE in a MU-MIMO paired UE cannot effectively perform interference suppression on signals of other UEs in the UE pair.

Disclosure of Invention

The embodiment of the invention provides an interference information indicating method, an interference suppression method and an interference suppression device, which are used for enabling one UE to perform interference suppression on a signal of another UE according to interference information indicated by a network side.

The embodiment of the invention provides an interference information indicating method, which comprises the following steps:

determining a first User Equipment (UE) and a second UE, wherein intra-cell interference or inter-cell interference exists between the first UE and the second UE;

and indicating interference information to the first UE through dynamic signaling or semi-static signaling so that the first UE performs interference suppression on a signal of the second UE according to the interference information.

Further, indicating the interference information to the first UE through dynamic signaling includes:

and indicating the interference information through a Physical Downlink Control Channel (PDCCH) or an Enhanced Physical Downlink Control Channel (EPDCCH) of the first UE.

Further, indicating interference information to the first UE, comprising:

indicating the parameter for demodulating the PDCCH or EPDCCH of the second UE to the first UE so that the first UE obtains the transmission parameter of the second UE by demodulating the PDCCH or EPDCCH of the second UE.

The embodiment of the invention provides an interference suppression method, which comprises the following steps:

the first user equipment UE acquires the indicated interference information through dynamic signaling or semi-static signaling;

and the first UE performs interference suppression on a signal of a second UE according to the indicated interference information, wherein intra-cell interference or inter-cell interference exists between the first UE and the second UE.

Further, the acquiring, by the first UE, the transmission parameter of the second UE according to the dynamic signaling includes:

and the first UE acquires the interference information according to a dynamic signaling transmitted by a Physical Downlink Control Channel (PDCCH) or an Enhanced Physical Downlink Control Channel (EPDCCH) of the first UE.

Further, the obtaining, by the first UE, the indicated interference information includes:

the first UE receives the indicated parameters for demodulating the PDCCH or EPDCCH of the second UE, and the first UE obtains the transmission parameters of the second UE by demodulating the PDCCH or EPDCCH of the second UE.

An embodiment of the present invention provides a base station, including:

a determining module, configured to determine a first user equipment UE and a second UE, where intra-cell interference or inter-cell interference exists between the first UE and the second UE;

an indicating module, configured to indicate interference information to the first UE through dynamic signaling or semi-static signaling, so that the first UE performs interference suppression on a signal of the second UE according to the interference information.

Further, the indication module is specifically configured to:

An embodiment of the present invention provides a UE, where the UE is a first UE, and the UE includes:

an obtaining module, configured to obtain the indicated interference information through a dynamic signaling or a semi-static signaling;

and an interference suppression module, configured to perform interference suppression on a signal of a second UE according to the indicated interference information, where intra-cell interference or inter-cell interference exists between the first UE and the second UE.

Further, the obtaining module is specifically configured to: and acquiring the interference information according to a dynamic signaling transmitted by a Physical Downlink Control Channel (PDCCH) or an Enhanced Physical Downlink Control Channel (EPDCCH) of the first UE.

Further, the obtaining module is specifically configured to: acquiring the indicated parameter for demodulating the PDCCH or EPDCCH of the second UE, wherein the first UE acquires the transmission parameter of the second UE by demodulating the PDCCH or EPDCCH of the second UE.

In the above embodiment of the present invention, after the network side determines the first UE and the second UE, where there is intra-cell interference or inter-cell interference between the first UE and the second UE, the network side indicates interference information for the first UE, so that the first UE can perform interference suppression on a signal of the second UE according to the interference information. In the process, the network side can obtain the interference information related to the second UE and further send the interference information to the first UE, so that the first UE performs interference suppression on the signal of the second UE according to the interference information.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments 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 to obtain other drawings based on these drawings without inventive exercise.

Fig. 1 is a schematic diagram of an interference information indication process according to an embodiment of the present invention;

FIG. 2 is a schematic diagram of an implementation of the process shown in FIG. 1;

FIG. 3 is a schematic diagram of another specific implementation of the process shown in FIG. 1;

fig. 4 is a schematic diagram of an interference suppression process according to an embodiment of the present invention;

FIG. 5 is a diagram illustrating an implementation of the process shown in FIG. 4;

FIG. 6 is a schematic diagram of another specific implementation of the process shown in FIG. 4;

fig. 7 is a schematic structural diagram of a base station according to an embodiment of the present invention;

fig. 8 is a schematic structural diagram of a user equipment according to an embodiment of the present invention;

fig. 9 is a schematic structural diagram of another base station according to an embodiment of the present invention;

fig. 10 is a schematic structural diagram of another user equipment according to an embodiment of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention clearer, the present invention will be described in further detail with reference to the accompanying drawings, and it is apparent that the described embodiments are only a part of the embodiments of the present invention, not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The embodiment of the invention provides an interference information indicating scheme and an interference suppression scheme realized based on the interference information indicating scheme, which are used for enabling one UE to perform interference suppression on a signal of another UE according to interference information indicated by a network side.

The embodiment of the invention can be suitable for an LTE (Long term evolution) system, an evolution system of the LTE system or other systems needing interference suppression. The embodiment of the invention is applied to an MU-MIMO scene, and can lead the UE in the MU-MIMO pairing group to carry out interference suppression on the signal of the paired UE.

Referring to fig. 1, a schematic diagram of an interference information indicating process according to an embodiment of the present invention is shown. The procedure is implemented on the network side, and may be performed by a base station or a network device having the function of the base station, for example.

Step 101, determining a first UE and a second UE.

Here, the signal transmission of the second UE may cause interference to the signal transmission of the first UE, for example, there is intra-cell interference or inter-cell interference between the first UE and the second UE. The number of the second UEs may be one or more. For example, the first UE and the second UE may be UEs in a group of MU-MIMO paired users.

In the following flow, only indicating interference information to a first UE in an MU-MIMO paired user group is described as an example. The first UE may be any UE in a group of MU-MIMO paired users, where the UEs other than the first UE are referred to as second UEs. In general, for each UE in a MU-MIMO paired user group, the network side may perform interference information indication according to the method provided in the embodiment of the present invention.

The embodiment of the invention does not limit the process of carrying out UE scheduling on the network side based on the MU-MIMO technology. Only one MU-MIMO based scheduling procedure is listed here. In the process, the UE performs channel estimation to obtain a channel matrix between the UE and the base station, and then feeds back a codebook index value corresponding to a maximum SINR (Signal to Interference plus Noise Ratio) value to the base station; and the base station collects the codebook index values fed back by the UEs, and performs UE pairing according to the codebook index values fed back by the UEs and further according to a certain criterion (such as a maximum throughput criterion). The number of the UEs in the MU-MIMO paired user group can be two, or more than two.

Step 102, indicating interference information to the first UE, so that the first UE performs interference suppression on a signal of the second UE according to the interference information.

In step 102, the base station may indicate the interference information to the first UE through dynamic signaling or may indicate the interference information to the first UE through semi-static signaling.

In brief, the indication of the interference information by using the semi-static signaling means: the base station notifies the UE that the signaling changes in a relatively long period of time, for example, the signaling is sent once in the time amplitude of tens or hundreds of subframes, and the frequency of sending a new interference information indication by the base station is low, which conforms to the characteristic of semi-static notification, for example, the base station sends interference information to the UE once every tens or hundreds of subframes. In the LTE system, one possible semi-static indication mode is an rrc (radio resource control) signaling mode.

In the embodiment of the present invention, the dynamic signaling refers to signaling that can be sent dynamically. The indication of the interference information by adopting the dynamic signaling means that: a signaling used by the base station for sending the interference information to the UE is dynamically sent, for example, the signaling may be sent in each subframe, so that the UE uses the interference information to perform interference suppression on a signal of a paired user in a current scheduling period according to the indicated interference information, and in an LTE system, such a dynamic signaling is generally sent by a Physical Downlink Control Channel (PDCCH for short) or an enhanced Physical Downlink Control Channel (EPDCCH for short).

In order to enable the UE scheduled to a paired user group to know the transmission parameters of the paired UE in time according to the scheduling condition after the base station schedules the UE (such as MU-MIMO scheduling), so as to effectively perform interference suppression, preferably, in the embodiment of the present invention, dynamic signaling is used to indicate the interference information, that is, the interference information is indicated to the first UE through the PDCCH or EPDCCH of the first UE.

The PDCCH is an important physical channel in 3GPP LTE and LTE-a standards, and is mainly used to carry UE resource allocation information and other control information, such as uplink and downlink resource scheduling information. In general, there may be a plurality of PDCCHs within one subframe. The EPDCCH is a physical channel in the 3GPP LTE-a standard, and compared with the PDCCH, the EPDCCH can obtain gains of beamforming and diversity, and increase flexibility of interference cancellation of a control channel in a heterogeneous network.

The interference information indicated for the first UE may be a transmission parameter of the second UE, and since the transmission parameter of the second UE reflects a transmission characteristic of the second UE, the first UE may perform effective interference suppression on a signal of the second UE based on the transmission characteristic of the second UE.

The second UE may be in the same cell as the first UE or in a different cell from the first UE. If the second UE and the first UE are in the same cell, the interference signal of the first UE comes from the cell where the first UE is located; if the second UE and the first UE are in different cells, the interference signal of the first UE is from the different cells of the first UE. The embodiment of the invention does not further limit whether the first UE and the second UE are in the same cell or in different cells.

In step 102, the base station may indicate the transmission parameters of the second UE to the first UE, and may also indicate parameters for demodulating PDCCH or EPDCCH of the second UE to the first UE, so that the first UE obtains the transmission parameters of the second UE by demodulating PDCCH or EPDCCH of the second UE.

Accordingly, the base station may indicate the interference information to the first UE in one of two ways:

the first mode is as follows: the transmission parameters of the second UE are indicated to the first UE. For example, the transmission parameters of the second UE are indicated directly by the PDCCH or EPDCCH of the first UE. The interference information indication process implemented in this way can be referred to as the first embodiment.

The second mode is as follows: considering that the transmission parameters of the second UE are generally transmitted to the second UE through the PDCCH or EPDCCH of the second UE, the parameters for demodulating the PDCCH or EPDCCH of the second UE may be indicated to the first UE, so that the first UE obtains the transmission parameters of the second UE by demodulating the PDCCH or EPDCCH of the second UE. The interference information indication process implemented in this way can be seen in the following second embodiment.

Consider that in the case of inter-cell MU-MIMO transmission, the receiver may need to know the demodulation order in order to effectively perform interference suppression.

Assuming that a UE uses a codeword-level interference cancellation (CWIC) receiver and the total transmission power allocated to a user pairing group by a base station is P, allocating L (0< L > 1) proportion of power to a first UE and (1-L) proportion of power to a second UE, the signal received by the first UE is:

wherein x is₁Representing first UE data, x₂Represents second UE data, h₁Representing a channel, n₁Representing received noise and interference.

The signals received by the second UE are:

wherein x is₁Representing first UE data, x₂Represents second UE data, h₂Representing a channel, n₂Representing received noise and interference.

If the first UE does not eliminate the interference caused by the second UE to the first UE, the signal-to-Noise Ratio (SNR) of the first UE is:

if the first UE demodulates the interference signal of the second UE first, suppresses or eliminates the signal of the second UE, and then demodulates the transmission signal of the first UE, the SNR of the first UE is:

wherein R is_nIs the interference power of the other cell received by the first UE.

It can be seen that the demodulation order of the first UE affects the SNR demodulated by the first UE. The network side may schedule the appropriate MCS at the time of scheduling based on the SNR value that may be observed by the first UE. If the demodulation order of the first UE is not consistent with the demodulation order expected by the network, the MCS scheduled by the network may not match the SNR actually received by the first UE.

In order to solve the above mismatch problem, in the embodiment of the present invention, preferably, the network side further indicates a demodulation order to the first UE to indicate the first UE to directly demodulate the data of the first UE, or demodulate the data of the first UE after performing interference suppression or cancellation on the signal of the second UE. Specifically, the indication may be performed through dynamic signaling, for example, the indication may be performed through a PDCCH or an EPDCCH of the first UE.

As described above, when the base station schedules the UEs based on the MU-MIMO technology, the determined user pair group usually includes two UEs, in this case, in step 102 of the above procedure, the base station indicates the transmission parameter of the second UE in one UE pair or the information for demodulating the PDCCH or EPDCCH of all other UEs to the first UE, so that the first UE performs interference suppression on the signal of the second UE according to the parameter. When the base station schedules the UEs based on the MU-MIMO technology, it may also schedule more than two UEs into one user pairing group, in this case, in step 102 of the above procedure, the base station indicates transmission parameters of all UEs in one user pairing group except the first UE or information for demodulating PDCCHs or EPDCCHs of all other UEs to the first UE, so that the first UE performs interference suppression on signals of these UEs according to the transmission parameters of these UEs.

An NAICS (Network-assisted interference cancellation/suppression) receiver is introduced in LTE rel.12, so that inter-cell interference can be suppressed or eliminated more effectively at the UE side. However, since the MU-MIMO of the existing system is scheduling of the base station, the UE does not know whether itself and another UE are scheduled in MU-MIMO transmission, nor what transmission characteristics the paired UE employs, and therefore the UE cannot use the NAICS receiver for interference suppression by knowing the signal characteristics of the paired UE.

After the embodiment of the invention is adopted, the network side indicates the interference information aiming at the first UE in the MU-MIMO paired users, so that the first UE can carry out interference suppression on the signal of the second UE according to the interference information. In the process, the MU-MIMO technology is realized based on network side scheduling, so that the network side can obtain interference information related to MU-MIMO scheduling and can further send the interference information to MU-MIMO paired users, and the UE in the MU-MIMO paired users can perform interference suppression according to the interference information.

Of course, the embodiments of the present invention are not limited to be applied in MU-MIMO scenarios, and in other scenarios, if signal transmission of a certain UE may be interfered by signal transmission of other UEs, the embodiments of the present invention may also be used to perform interference suppression.

The following describes, by way of a first embodiment, an interference information indication procedure implemented in the first manner in step 102.

As shown in fig. 2, the process may include:

step 201, determining a first UE and a second UE;

here, the signal transmission of the second UE may cause interference to the signal transmission of the first UE, for example, there is intra-cell interference or inter-cell interference between the first UE and the second UE.

Step 202, indicating the transmission parameters of the second UE to the first UE. Specifically, the transmission parameters of the second UE may be indicated to the first UE through a PDCCH or EPDCCH of the first UE.

In step 202, the interference information may be sent to the first UE. In order to reduce the amount of data sent to the first UE, the embodiment of the present invention may preferably indicate the interference information in a manner of subset restriction (english).

Briefly, the subset constraint mode is as follows: a set of possible interference information for the second UE is stored in advance in a subset of transmission parameters, the content of which subset can be sent to the first UE by higher layer signaling. In this way, when the transmission parameter of the second UE is indicated to the first UE, the index information of the transmission parameter in the transmission parameter subset may be sent to the first UE, so that the first UE may obtain the corresponding transmission parameter in the transmission parameter subset according to the index information. Preferably, one transmission parameter subset includes a set of transmission parameters that may be used by the second UE, and all transmission parameters included in one transmission parameter subset are of the same kind.

Further, considering that some transmission parameters of the second UE may be the same as the transmission parameters of the first UE, in order to reduce the amount of information transmitted, in the embodiment of the present invention, preferably, the indication information may be sent to the first UE, where the indication information is used to indicate that a certain type or certain types of transmission parameters of the second UE are the same as the values of the similar transmission parameters of the first UE, so that the first UE performs interference suppression on the signal of the second UE according to its own transmission parameters.

For example, the base station may send first indication information to the first UE, where the first indication information indicates one or any combination of the following:

the number of CRSs (cell-specific radio resources) of the antenna port of the cell where the second UE is located and the mapping scheme are the same as those of the cell where the first UE is located;

the MSBFN subframe configuration of the cell where the second UE is located is the same as that of the cell where the first UE is located;

the PDSCH starting symbol position of the cell where the second UE is located is the same as that of the cell where the first UE is located;

a mapping scheme of the signal of the second UE is the same as a mapping scheme of the signal of the first UE.

Further, considering that the parameters required for the UE to perform interference cancellation depend on the receiver type, the interference information employed by different types of receivers may be different, and therefore, preferably, the following steps may be performed before step 202: and determining the type of the transmission parameters of the second UE which need to be indicated to the first UE according to the type of the receiver of the first UE.

The embodiments of the present invention take a codeword-level interference cancellation (CWIC) receiver as an example, and describe the content of the indicated interference information, and the cases of other types of receivers are similar and will not be described herein. The transmission parameters of the second UE that may be required by the CWIC receiver of the first UE may include one or any combination of the following:

1) the number of antenna ports of CRS (Cell-specific reference signals) and the mapping scheme (english: mapping scheme);

2) MBSFN (multicast service Single frequency network) subframe configuration information;

3) physical Downlink Shared Channel (PDSCH) starting symbol position information;

4) CSI-RS (Channel State Indication-reference signals) resource information, wherein the CSI-RS resource comprises a zero-power CSI-RS resource power and a non-zero-power CSI-RS resource;

5) signal power information, the signal power information comprising a PA or comprising

Or other power profile parameters;

6) modulation and coding scheme (english: modulation/coding scheme, abbreviated as: MCS);

7) a UE identity;

8) rank indication (english: rank indication, abbreviated as: RI), precoding matrix indication (english: a precoding matrix indicator, abbreviated as: PMI);

9) indication information of whether interference is present;

10) the Scrambling code information may be indication information of a Scrambling code used, for example, a Scrambling code identifier (Scrambling ID), or a virtual cell identifier (english: virtual cell ID, abbreviated as: VCID).

The above-mentioned transmission parameters are specifically described below.

Antenna port number and mapping scheme for CRS (first-generation) radio service (CRS)

The number of antenna ports of the CRS refers to the number of antenna ports transmitting the CRS. The function of the CRS in downlink includes carrying some information during channel precoding, helping the UE to perform channel estimation of the downlink channel, and also being used for channel instruction transmission and channel detection. The CRS transmits one reference signal on each downlink antenna port. The antenna ports are defined by the CRS used for the antenna transmission.

The mapping scheme refers to a mapping pattern of CRS to time/frequency. The CRSs of different cells in the LTE system are shifted differently in the frequency domain (frequency shift) for their Cell _ ID, and are mapped on different resource elements corresponding to different frequency shift, which reduces interference between CRSs of different cells, and the value of frequency shift corresponds to mod (CellID/6). The mapping scheme reflects the resource mapping condition of the CRS. The PDSCH signal transmitted in another cell is mapped around the CRS signal, and the resource element carrying the CRS is not used for transmitting other signals, so the information of the CRS correspondingly transfers the mapping of the PDSCH in the time domain/frequency domain.

The first UE may obtain which time/frequency resource elements the PDSCH of the second UE is mapped on according to the number of antenna ports of the CRS and the mapping scheme, so as to suppress its interference signal.

The mapping scheme may be represented using a frequency domain offset of a CRS, wherein the frequency domain offset of the CRS may be a frequency domain offset of the CRS of the second UE cell; or may be a difference between the frequency offset of the CRS of the cell in which the second UE is located and the frequency offset of the CRS of the cell in which the first UE is located. For example, the mapping scheme of the second UE may be represented as C _ shift _ 2-C _ shift _1, where C _ shift _2 represents a CRS frequency domain offset of a cell in which the second UE is located, and C _ shift _1 represents a CRS frequency domain offset of a cell in which the first UE is located.

In rel.12, the number of antenna ports and mapping scheme of CRS are configured semi-statically through higher layer signaling. In the embodiment of the present invention, the number of antenna ports and the mapping scheme of the CRS of the second UE may be indicated to the first UE by using this method, or the number of antenna ports and the mapping scheme of the CRS of the second UE may be indicated to the first UE by using a dynamic signaling, where the dynamic signaling is sent through the PCDDH or EPDCCH of the first UE.

In order to reduce the amount of transmitted data and reduce the network resource overhead, in an implementation manner, a network side may configure a subset of the number of antenna ports and the mapping scheme of a CRS to a first UE through a high-level signaling, where the subset includes a set of possible numbers of antenna ports of the CRS and parameters of the mapping scheme; the network side may indicate, to the first UE through dynamic signaling, which parameter in the subset is used to perform interference suppression on a signal of the second UE, for example, by indicating index information of the parameter, the first UE obtains, according to the index information, the number of antenna ports and a mapping scheme of a CRS corresponding to the subset.

In the case that intra-cell interference is from MU-MIMO transmission, the first UE and the second UE are both in the same cell, and since the interference is from the same cell, the network side may not indicate to the first UE the number of antenna ports and the mapping scheme of the CRS of the second UE, and the first UE may consider that the second UE has the same number of antenna ports and the mapping scheme of the CRS as the first UE itself.

Since the number of antenna ports and the mapping scheme of the CRS of the second UE may be the same as or different from those of the CRS of the first UE, the network side may send, through dynamic signaling, indication information to the first UE to indicate whether the number of antenna ports and the mapping scheme of the CRS of the second UE are the same as those of the CRS of the first UE, where the indication information may be 1-bit indication information. If the indication information indicates that the two are the same, the first UE may consider that the mapping of the PDSCH of the second UE corresponds to the CRS antenna port number and mapping scheme of the cell where the first UE is located when performing interference suppression, so as to perform interference suppression on the signal of the second UE.

(II) MSBFN subframe configuration information

The MSBFN subframe configuration information can be configured semi-statically through high-level signaling, or can indicate the MSBFN subframe configuration information of the second UE to the first UE in a dynamic signaling mode, and the dynamic signaling is sent through a PDCCH or an EPDCCH of the first UE.

In order to reduce the amount of transmitted data and reduce the network resource overhead, in one implementation, the network side may configure a subset of MSBFN subframe configuration information to the first UE through a high-level signaling, where the subset includes a set of possible MSBFN subframe configuration parameters; the network side may indicate to the first UE through dynamic signaling which parameter in the subset is used to perform interference suppression on the signal of the second UE, for example, by indicating index information of the parameter, the first UE obtains corresponding MSBFN subframe configuration information in the subset according to the index information.

Under the condition that the interference in the cell comes from MU-MIMO transmission, the first UE and the second UE are both in the same cell, and because the interference comes from the same cell, the network side may not indicate the MSBFN subframe configuration information of the second UE to the first UE, and the first UE may consider that the second UE has the same MSBFN subframe configuration information as the first UE itself.

Since the MSBFN subframe configuration information of the second UE may be the same as or different from the MSBFN subframe configuration information of the first UE, the network side may send indication information to the first UE through dynamic signaling to indicate whether the MSBFN subframe configuration information of the second UE is the same as the MSBFN subframe configuration information of the first UE, and the indication information may be 1-bit indication information. If the indication information indicates that the two are the same, the first UE may perform interference suppression on the signal of the second UE using the MSBFN subframe configuration information of the cell where the first UE is located when performing interference suppression, and if the indication information indicates that the two are different, the MSBFN subframe configuration information of the second UE may be indicated to the first UE in the foregoing manner.

(III) PDSCH starting symbol position information

The PDSCH starting symbol position of the second UE may use absolute position information of the PDSCH starting symbol of the second UE, such as the number of the starting symbol, or may be a relative position of the PDSCH starting symbol of the second UE and the PDSCH starting symbol of the first UE, such as a difference between the symbol numbers of the two.

In order to reduce the amount of data transmitted and reduce the network resource overhead, in an implementation, the network side may configure a subset of PDSCH starting symbol position information to the first UE through higher layer signaling, where the subset includes a set of possible PDSCH starting symbol positions; the network side may indicate to the first UE through dynamic signaling which parameter in the subset is used to perform interference suppression on the signal of the second UE, for example, by indicating index information of the parameter, the first UE obtains the corresponding PDSCH starting symbol position information in the subset according to the index information.

In the case that intra-cell interference is from MU-MIMO transmission, the first UE and the second UE are both in the same cell, and the interference is from the same cell, if the transmission mode adopted by the first UE and the second UE is one of TM1 to TM9, and there is no cross-carrier scheduling, the first UE and the second UE have the same PDSCH starting symbol position, so the network side may not indicate PDSCH starting symbol position information to the first UE, and the first UE may consider that the second UE has the same PDSCH starting symbol position as the first UE itself. If one of the first UE and the second UE adopts TM10 or uses cross-carrier scheduling, the PDSCH starting symbol position of the second UE is indicated to the first UE in the manner described above.

Since the PDSCH starting symbol position of the second UE may be the same as or different from the PDSCH starting symbol position of the first UE, the network side may send indication information to the first UE through dynamic signaling to indicate whether the PDSCH starting symbol position of the second UE is the same as the PDSCH starting symbol position of the first UE, where the indication information may be 1-bit indication information. If the indication information indicates that the two are the same, the first UE may perform interference suppression on the signal of the second UE according to the PDSCH starting symbol position of the first UE when performing interference suppression, and if the indication information indicates that the two are different, the PDSCH starting symbol position of the second UE may be indicated to the first UE in the foregoing manner.

(IV) signal power information, the signal power information comprising a PA or comprising

The PA represents a ratio of a data subcarrier power and a pilot subcarrier power of an Orthogonal Frequency Division Multiplexing (OFDM) symbol without a pilot, and the OFDM symbol without the pilot is referred to as a class a symbol herein; PB represents a ratio of a data subcarrier power and a pilot subcarrier power of the OFDM symbol with pilot, and the OFDM symbol with pilot is referred to as a class B symbol herein. Through the PA and PB information, the UE can judge the transmission power of the PDSCH of the UE and correspondingly demodulate the PDSCH. It should be noted that the power information informing the UE in the LTE system is PA and

in the CRS-based transmission mode, the network side may notify the first UE of the information of the absolute signal power of the second UE or the information of the proportional relationship between the power of the second UE and the power of the first UE through dynamic signaling.

For example, PA and/or PB of the second UE, or their corresponding power information, is indicated to the first UE. Specifically, the network side may send the PA, PB, and/or EPDCCH of the second UE via the PDCCH or EPDCCH of the first UE,

To the first UE.

For another example, the network side may notify the first UE of one or a combination of the following information through the PDCCH or EPDCCH of the first UE:

a ratio of the PA of the second UE to the PA of the first UE;

a ratio of the PB of the second UE to the PB of the first UE;

of the second UE

With a first UE

The ratio of (a) to (b).

For example, the content notified to the first UE may include:

△＝P_A，2/P_A，1and/or Δ ═ P_B，2/P_B，1

Wherein, P_A1PA, P representing first UE_A2PA, P representing second UE_B1PB, P representing first UE_B2Representing the PB of the second UE.

In DMRS (Demodulation reference signals) -based transmission mode, the conventional system does not need to connect PA or DMRS

The UE is informed because the UE does not need this information for data demodulation. However, in the case of dynamic interference cancellation, the first UE needs to know the corresponding relationship between the powers of the second UE and the first UE to perform appropriate interference reconstruction and cancellation. For this purpose, the dynamic control signaling (such as PDCCH/EPDCCH) of the first UE may dynamically inform the first UE of the relation information of the power of the second UE and the first UE; such power relationships include, but are not limited to, the PA ratio of the second UE to the first UE, the PB ratio of the second UE

First UEIs/are as follows

The relative relationship of (a) and (b).

The network side may notify the first UE of the PB of the second UE or may not notify the first UE of the PB. If the first UE is not notified of the PB of the second UE, the first UE may consider the PB of the second UE to be the same as the PB of the first UE; if the first UE is notified of the PB of the second UE, the notified PB may represent the PB of the interference generated by the cell in which the first UE is located, or the PB of the neighboring cell.

In order to reduce the amount of data transmitted and reduce the network resource overhead, in one implementation, the network side may configure one UE to the first UE through higher layer signaling

A subset of (2), the subset comprising a set of possible possibilities

Or a group of

E.g. of the second UE

With a first UE

A difference of (d); the network side indicates to the first UE through dynamic signaling which parameter in the subset is used to perform interference suppression on the signal of the second UE, for example, by indicating index information of the parameter, the first UE obtains the corresponding parameter in the subset according to the index information

Or

The difference of (a).

In another embodiment, the network side may indicate the PA allocated to the second UE or the ratio of the PA allocated to the second UE to the total power allocated to all UEs in the user pair group to the first UE. In MU-MIMO transmission, the total power allocated to the user pair group by the network side is distributed among the UEs in the user pair group. The network side can inform the power allocated to a certain UE through dynamic signaling. Here, when the network side notifies a UE of the power allocated to the UE, the network side may notify the UE of the absolute power allocated to the UE, or may notify the UE of a ratio, where the ratio represents a ratio of the power allocated to the UE by the network side to the total power allocated to the user pairing group in which the UE is located. For example, if the network side notifies the first UE of a ratio value L, the ratio of the power allocated to the first UE by the network side to the total power of the user pairing group in which the UE is located is L, or the ratio of the power allocated to the first UE by the network side to the power allocated to the other users of the user pairing group in which the UE is located is L. Since the number of paired users in MU-MIMO can be dynamically changed, the power allocated to a certain user by the network side can also be dynamically changed, and the PA can be notified by the network side through dynamic signaling.

(V) MCS

If the first UE uses a CWIC receiver, the first UE needs to perform codeword decoding and reconstruction according to the MCS of the second UE.

The network side may inform the first UE of the MCS of the second UE through dynamic signaling through the PDCCH or EPDCCH of the first UE.

The network side may send the MCS of the second UE to the first UE, or send a difference between the MCS of the second UE and the MCS of the first UE to the first UE, so that the first UE determines the MCS of the second UE.

In order to reduce the amount of data transmitted and reduce the network resource overhead, in one implementation, the network side may configure a subset of MCSs to the first UE through higher layer signaling, where the subset includes a set of possible MCSs; the network side may indicate to the first UE through dynamic signaling which parameter in the subset is used to perform interference suppression on the signal of the second UE, for example, by indicating index information of the parameter, the first UE obtains a corresponding MCS in the subset according to the index information. Or the UE1 may blind-detect the MCS used by the second UE in the MCS subset configured by the higher layer signaling.

Further, the network side may indicate an MCS to the first UE, in which case the first UE considers that the interference on all pairs of Physical Resource Blocks (PRB) of the first UE belongs to the MCS. The network side may also indicate a plurality of MCSs to the first UE, each MCS corresponds to one Set of PRB pairs, and the first UE may determine a Transport Block Set (TBS) of the second UE according to a correspondence between the MCSs and the PRB pairs.

Further, in a case that the receiver of the first UE needs a redundancy version (english: redundancy version) of the receiver of the second UE, the network side may also indicate the redundancy version of the receiver of the second UE to the first UE through dynamic signaling.

(VI) UE identity

The scrambling sequence used by the PDSCH of the second UE is a function of the identity of the second UE, which the first UE needs to know in order to demodulate the PDSCH of the second UE.

The network side may notify the identifier of the second UE to the first UE through dynamic signaling through the PDCCH of the first UE.

The network side may send the identifier of the second UE to the first UE, or send the difference between the identifier of the second UE and the identifier of the first UE to the first UE, so that the first UE determines the identifier of the second UE.

In order to reduce the amount of data to be transmitted and reduce the network resource overhead, in an implementation manner, the network side may configure a subset of UE identities to the first UE through higher layer signaling, where the subset includes a group of UE identities that may be used for scrambling the PDSCH, and indicate, by dynamic signaling, to the first UE, which parameter in the subset is used to perform interference suppression on a signal of the second UE, for example, by indicating index information of the parameter, the first UE is enabled to obtain a corresponding UE identity in the subset according to the index information.

Further, the signaling of the first UE may directly inform the first UE. of the PDSCH scrambling sequence of the second UE of the PDSCH scrambling information of the second UE as a function of the UE-ID of the second UE, the nSCID of the second UE, or the virtual cell ID of the second UE. The signaling of the first UE (including dynamic PDCCH/EPDCCH signaling) may inform the UE of information of the scrambling sequence function of the PDSCH of the second UE (which may contain the parameters mentioned above).

The interference information indication procedure implemented in the second manner in step 102 is described below by way of a second embodiment.

As shown in fig. 3, the process may include:

step 301, determining a first UE and a second UE. This step can be performed as shown in step 201 of the flow chart of fig. 2.

Step 302, indicating the parameter for demodulating the PDCCH or EPDCCH of the second UE to the first UE, so that the first UE obtains the transmission parameter of the second UE by demodulating the PDCCH or EPDCCH of the second UE. Specifically, the transmission parameters of the second UE may be indicated to the first UE through a PDCCH or EPDCCH of the first UE.

In step 302, the network side may use dynamic signaling or semi-static signaling to indicate the information to the first UE. In a possible implementation manner, the base station may notify the first UE of the parameter for demodulating the PDCCH or EPDCCH of the second UE in a semi-static manner, and then the first UE dynamically demodulates the PDCCH or EPDCCH of the second UE to obtain the transmission parameter of the second UE, so as to perform interference suppression.

Whether the PDCCH or EPDCCH of the second UE is transmitted in a common search space (common search space) or a UE-specific search space (UE-specific search space), the transmission mode (transmission mode) and UE identity of the second UE need to be known when demodulating the PDCCH or EPDCCH of the second UE. Therefore, in step 302 of the above procedure, the parameter for demodulating PDCCH or EPDCCH of the second UE includes one or any combination of the following parameters:

a transmission mode of the second UE;

an identity of the second UE;

scrambling code information of the PDCCH or EPDCCH of the second UE.

In step 302, the network side may send the parameter for demodulating the PDCCH of the second UE to the first UE.

In order to reduce the amount of data transmitted and reduce the network resource overhead, in one implementation, the network side may configure a parameter subset to the first UE through higher layer signaling, where the parameter subset includes a set of possible parameters for demodulating the PDCCH of the second UE; the network side indicates to the first UE through dynamic signaling which parameter or parameters in the subset are used to demodulate the PDCCH of the second UE, for example, by indicating index information of the parameters, the first UE obtains the corresponding parameters in the subset according to the index information.

If the scheduling of the second UE is implemented by the EPDCCH, the first UE needs to demodulate the EPDCCH of the second UE to obtain the transmission parameter of the second UE for interference suppression. In this case, in step 302, the parameters for demodulating EPDCCH of the second UE further include one or any combination of the following parameters:

1) the number of EPDCCH subsets;

2) PRB indices in each EPDCCH subset;

3) the EPDCCH subset is a local EPDCCH subset or a distributed EPDCCH subset;

4) the subframe where the EPDCCH is monitored;

5) carrier indication field (english: carrier indicator filtered, for short: CIF) whether configured for the carrier, in which EPDCCH needs to be monitored;

6) EPDCCH aggregation levels need to be monitored.

In step 302, the network side may send the above parameters for demodulating PDCCH or EPDCCH of the second UE to the first UE.

In order to reduce the amount of data transmitted and reduce the network resource overhead, in one implementation, the network side may configure a parameter subset to the first UE through higher layer signaling, where the parameter subset includes a set of possible parameters for demodulating EPDCCH of the second UE; the network side indicates to the first UE through dynamic signaling which parameter or parameters in the subset are used to demodulate the EPDCCH of the second UE, for example, by indicating index information of the parameters, the first UE obtains the corresponding parameters in the subset according to the index information.

Referring to fig. 4, a schematic diagram of an interference suppression process according to an embodiment of the present invention is provided. The procedure is implemented on the user equipment side, and the following procedure is described with the first UE as an execution subject. The process may include:

in step 401, the first UE acquires the indicated interference information.

In this step, the first UE acquires the indicated interference information from the network side, and the process of indicating the interference information to the first UE by the network side may refer to step 101 in the flow shown in fig. 1, which is not described herein again.

Step 402, the first UE performs interference suppression on the signal of the second UE according to the indicated interference information.

Here, the signal transmission of the first UE may be interfered by the signal transmission of the second UE, for example, there is intra-cell interference or inter-cell interference between the first UE and the second UE. The number of the second UEs may be one or multiple. For example, the first UE and the second UE may be UEs in a group of MU-MIMO paired users.

In the following flow, only a first UE in the MU-MIMO paired user group is taken as an example to obtain transmission parameters of a second UE in the paired user group, where the first UE may be any UE in the MU-MIMO paired user group, and the UEs in the MU-MIMO paired user group except the first UE are all referred to as the second UE.

In step 402, the first UE may acquire the indicated interference information through dynamic signaling or may acquire the indicated interference information through semi-static signaling.

In order to enable the UE scheduled to a paired user group to know the transmission parameters of the paired UE in time according to the scheduling condition after the base station schedules the UE (such as MU-MIMO scheduling), so as to effectively perform interference suppression, preferably, in the embodiment of the present invention, a dynamic signaling is used to indicate the interference information, and accordingly, the first UE obtains the interference information indicated by the network side to the first UE through a PDCCH or an EPDCCH.

In step 402, the first UE may acquire the transmission parameters of the second UE indicated by the network side, or may demodulate the PDCCH or EPDCCH of the second UE according to the parameters, sent to the first UE by the network side, for demodulating the PDCCH or EPDCCH of the second UE to obtain the transmission parameters of the second UE.

In the embodiment of the present invention, the first UE may obtain the transmission parameters of the second UE through the following two ways:

the first mode is as follows: and acquiring the transmission parameters of the second UE indicated by the network side. For example, the PDCCH or EPDCCH of the first UE receives the transmission parameters sent by the network side about the second UE, and the procedure of obtaining the transmission parameters of the second UE by using this method may be seen in the third embodiment.

The second mode is as follows: since the transmission parameters of the second UE are usually sent to the second UE through the PDCCH or EPDCCH of the second UE, the first UE may obtain the transmission parameters of the second UE by demodulating the PDCCH or EPDCCH of the second UE according to the parameters, sent to the first UE by the network side, for demodulating the PDCCH or EPDCCH of the second UE. The procedure for obtaining the transmission parameters of the second UE by using this method can be seen in the fourth embodiment.

Further, it is considered that in the case of inter-cell MU-MIMO transmission, the receiver may need to know the demodulation order in order to perform interference suppression efficiently. Therefore, preferably, the network side further indicates a demodulation order to the first UE to indicate the first UE to demodulate the data of the first UE directly, or demodulates the data of the first UE after performing interference suppression or cancellation on the signal of the second UE. Specifically, the indication may be performed through dynamic signaling, for example, the indication may be performed through a PDCCH or an EPDCCH of the first UE. Accordingly, the first UE may perform signal demodulation according to the demodulation order indicated by the network side.

The following describes a procedure of obtaining interference information indicated by the network side in the first manner in step 401 by a third embodiment. As shown in fig. 5, the process may include:

step 501, the first UE obtains the indicated transmission parameters of the second UE.

Step 502, the first UE performs interference suppression on the signal of the second UE according to the indicated transmission parameter of the second UE.

In order to reduce the amount of transmitted information, in step 502, preferably, the embodiment of the present invention may use a subset restriction manner to indicate the transmission parameters of the second UE. Briefly, the subset restriction means that a set of possible transmission parameters of the second UE are stored in a transmission parameter subset and sent to the first UE through higher layer signaling. The first UE may obtain the transmission parameter of the second UE from the transmission parameter subset according to index information about the transmission parameter of the second UE in the transmission parameter subset sent by the network side. Preferably, one transmission parameter subset includes a set of transmission parameters that may be used by the second UE, and all transmission parameters included in one transmission parameter subset are of the same kind.

Further, since some transmission parameters of the second UE may be the same as the transmission parameters of the first UE, in order to reduce the amount of transmitted information, in the embodiment of the present invention, preferably, the first UE may determine that a certain type or certain types of transmission parameters in the second UE have the same value as its own transmission parameters according to the indication information of the network side, so as to perform interference suppression on the signal of the second UE. The indication information may be sent to the first UE through dynamic signaling, for example, through a PDCCH or an EPDCCH of the first UE.

For example, the first UE may determine the transmission parameter of the second UE according to first indication information sent by the network side, where the first indication information is used to indicate one or any combination of the following:

The specific kind of the transmission parameters of the second UE depends on the receiver type, and the interference information employed by different types of receivers may be different. In the embodiment of the present invention, a CWIC receiver of a first UE is taken as an example to describe a transmission parameter type of a second UE that needs to be indicated to the first UE, and since there are many receiver types, processing conditions of other types of receivers and processing condition types of the CWIC receiver are not described herein again. In the embodiment of the present invention, the interference information that may be needed by the CWIC receiver of the first UE may include one or any combination of the following:

1) the number of antenna ports of CRS and the mapping scheme;

2) MBSFN subframe configuration information;

3) physical downlink shared channel initial symbol position information;

4) CSI-RS resource information, wherein the CSI-RS resource comprises a zero-power CSI-RS resource power and a non-zero-power CSI-RS resource;

Or other power profile parameter;

6) a modulation and coding scheme;

7) a UE identity;

8) rank indication, precoding matrix indication;

9) indication information of whether interference is present;

10) the scrambling code information may be indication information of the used scrambling code, for example, a scrambling code identifier or a virtual cell identifier.

For the above description of various transmission parameters, please refer to the foregoing embodiments, which are not described herein again.

Preferably, in order to reduce network resource overhead, in a possible implementation, the network side configures, to the first UE, a subset of an antenna port order mapping scheme for the CRS of the second UE through a high-level signaling, where the subset includes a set of possible antenna port numbers of the CRS and parameters of the mapping scheme. And the network side sends the index information of the antenna port order mapping scheme of the CRS of the second UE in the subset to the first UE through dynamic signaling, and the first UE acquires the corresponding antenna port order mapping scheme of the CRS from the subset according to the index information and performs interference suppression on the signal of the second UE according to the acquired transmission parameters of the second UE.

Preferably, in a case that intra-cell interference is from MU-MIMO transmission, the first UE and the second UE are both in the same cell, and since the interference is from the same cell, the first UE may confirm that the second UE has the same number of antenna ports and mapping scheme of CRS as its own. Because the number of antenna ports and the mapping scheme of the CRS of the second UE may be the same as or different from the number of antenna ports and the mapping scheme of the CRS of the first UE, the first UE may determine whether the number of antenna ports and the mapping scheme of the CRS of the second UE are the same as the number of antenna ports and the mapping scheme of the CRS of the first UE according to a dynamic signaling sent to the first UE by the network side, where the dynamic signaling received by the first UE and sent by the network side may be 1-bit indication information. If the first UE determines that the first UE and the second UE are the same according to the indication information sent by the network side, the first UE can perform interference suppression on the signal of the second UE according to the number of antenna ports of the CRS of the second UE and the mapping scheme; if the first UE determines that the two are different according to the indication information sent by the network side, the first UE needs to determine the number of antenna ports and the mapping scheme of the CRS of the second UE according to the dynamic signaling sent by the network side, so as to perform interference suppression on the signal of the second UE.

Preferably, in order to reduce network resource overhead, in a possible implementation, the network side configures a subset of MSBFN subframe configuration information for the first UE through higher layer signaling, where the subset includes a set of possible MSBFN subframe configuration parameters. The network side sends the index information of the MSBFN subframe configuration parameters of the second UE in the subset to the first UE through dynamic signaling or semi-static signaling, and the first UE can obtain the corresponding MSBFN subframe configuration parameters from the subset according to the index information and carry out interference suppression on signals of the second UE.

Preferably, in the case that intra-cell interference is from MU-MIMO transmission, the first UE and the second UE are both in the same cell, and since the interference is from the same cell, the first UE may confirm that the second UE has the same MSBFN subframe configuration information as itself.

Because the MSBFN subframe configuration information of the second UE may be the same as or different from the MSBFN subframe configuration information of the first UE, the first UE may determine whether the MSBFN subframe configuration information of the second UE is the same as the MSBFN subframe configuration information of the first UE according to a dynamic signaling sent by the network side to the first UE, where the dynamic signaling received by the first UE and sent by the network side may be 1-bit indication information. If the first UE determines that the information of the first UE and the information of the second UE are the same according to the indication information sent by the network side, the first UE can perform interference suppression on the signal of the second UE according to the MSBFN subframe configuration information of the first UE when performing interference planning; if the first UE determines that the two information are different according to the indication information sent by the network side, the first UE needs to determine the MSBFN subframe configuration information of the second UE according to the dynamic signaling sent by the network side.

Preferably, in order to reduce network resource overhead, in a possible implementation, the network side may configure a subset of PDSCH starting symbol position information for the first UE through higher layer signaling, where the subset includes a set of possible PDSCH starting symbol position information. And the network side sends the index information of the PDSCH initial symbol position information of the second UE in the subset to the first UE through dynamic signaling or semi-static signaling, and the first UE obtains corresponding parameters from the subset according to the index information and carries out interference suppression on signals of the second UE according to the parameters.

In the case that intra-cell interference is from MU-MIMO transmission, the first UE and the second UE are both in the same cell, and the interference is from the same cell, if the transmission mode adopted by the first UE and the second UE is one of TM1 to TM9, and there is no cross-carrier scheduling, the first UE and the second UE have the same PDSCH starting symbol position, so the first UE may not need PDSCH starting symbol position information of the second UE indicated by the network side, and the first UE may consider that the second UE has the same PDSCH starting symbol position as the first UE itself. If one of the first UE and the second UE adopts TM10 or uses cross-carrier scheduling, the first UE needs to determine the PDSCH starting symbol position of the second UE according to dynamic signaling or semi-static signaling sent by the network side.

Preferably, since the PDSCH starting symbol position of the second UE may be the same as or different from the PDSCH starting symbol position of the first UE, the first UE may determine whether the PDSCH starting symbol position of the second UE is the same as the PDSCH starting symbol position of the first UE according to dynamic signaling sent by the network side to the first UE, where the dynamic signaling received by the first UE and sent by the network side may be 1-bit indication information. If the first UE determines that the two are the same according to the indication information sent by the network side, the first UE can perform interference suppression on the signal of the second UE according to the PDSCH initial symbol position of the first UE when performing interference planning; if the first UE determines that the two are different according to the indication information sent by the network side, the first UE needs to determine the PDSCH starting symbol position of the second UE according to the dynamic signaling sent by the network side.

Preferably, in the CRS-based transmission mode, the first UE may determine the PA and/or PB of the second UE, or power information corresponding thereto, according to dynamic signaling sent by the network side to the first UE.

For example, the first UE may receive one or more kinds of power information of the second UE transmitted by the network side according to the PDCCH or EPDCCH of the first UE: PA, PB,

For another example, the first UE may receive, from the network side, one or more types of power information of the second UE according to the PDCCH or EPDCCH of the first UE:

a ratio of the PA of the second UE to the PA of the first UE;

a ratio of the PB of the second UE to the PB of the first UE;

of the second UE

With a first UE

The ratio of (a) to (b).

The first UE may also receive, according to the PDCCH or EPDCCH of the first UE, a ratio of PBs of the second UE and the first UE from the network side.

For example, the content acquired by the first UE may include:

△＝P_A，2/P_A，1and/or Δ ═ P_B，1/P_B，1

In DMRS-based transmission mode, legacy systems do not need to couple PA or PA

The UE is informed because the UE does not need this information for data demodulation. However, in the case of dynamic interference cancellation, the first UE needs to know the corresponding relationship between the powers of the second UE and the first UE to perform appropriate interference reconstruction and cancellation. For this purpose, dynamic control signaling (such as PDCCH or EPDCCH) of the first UE may dynamically inform the first UE of the relationship information of the power of the second UE and the first UE; such power relationships include, but are not limited to: PA ratio of second UE to first UE, PB ratio of second UE to first UE, and PB ratio of second UE to first UE

Of a first UE

The relative relationship of (a) and (b).

The first UE may receive, according to the PDCCH or EPDCCH of the first UE, a PB of the second UE sent by the network side, and if the first UE receives, according to the PDCCH or EPDCCH of the first UE, the PB of the second UE sent by the network side, where the PB may indicate a PB of interference generated by a cell where the first UE is located, or a PB of an adjacent cell; if the first UE does not receive the PB of the second UE sent by the network side according to the PDCCH or EPDCCH of the first UE, it may be considered that the PB of the second UE is the same as the PB of the first UE.

Preferably, in order to reduce network resource overhead, in a possible implementation, the network side may configure the first UE through higher layer signaling

A subset of (2), the subset comprising a set of possible possibilities

Or a group of

The difference of (a). The network side sends the second UE to the first UE through dynamic signaling or semi-static signaling

In the index information in the subset, the first UE acquires the corresponding parameters from the subset according to the index information, and accordingly performs interference suppression on the signal of the second UE.

Preferably, the information of the MCS received by the first UE from the network side may be an MCS of the second UE, or may be a difference between the MCS of the second UE and the MCS of the first UE, and the first UE may determine the MCS of the second UE according to the difference and the MCS of the first UE.

Preferably, in order to reduce the network resource overhead, in a possible implementation, the network side may configure a subset of MCSs for the first UE through higher layer signaling, where the subset includes a set of possible MCSs. And the network side sends the index information of the MCS of the second UE in the subset to the first UE through dynamic signaling or semi-static signaling, and the first UE obtains the MCS of the second UE from the subset according to the index information and carries out interference suppression on the signal of the second UE according to the MCS of the second UE.

Optionally, in order to reduce network resource overhead, in a possible implementation, the network side may configure a subset of UE identities for the first UE through higher layer signaling, where the subset includes a set of UE identities that may be used for scrambling the PDSCH. The network side sends index information of the identifier of the second UE in the subset to the first UE through dynamic signaling or semi-static signaling, and the first UE acquires the identifier of the second UE from the subset according to the index information and carries out interference suppression on the signal of the second UE according to the identifier.

The flow of obtaining the interference information in the second manner in step 401 is described below by way of embodiment four. As shown in fig. 6, the process may include:

601, a first UE acquires an indicated parameter for demodulating a PDCCH or EPDCCH of a second UE, and the first UE acquires a transmission parameter of the second UE by demodulating the PDCCH or EPDCCH of the second UE;

step 602, the first UE performs interference suppression on the signal of the second UE according to the indicated transmission parameter of the second UE.

Whether the PDCCH or EPDCCH of the second UE is transmitted in the common search space or the UE-specific search space, the transmission mode and UE identity of the second UE need to be known when demodulating the PDCCH or EPDCCH of the second UE. Therefore, in step 601 of the above procedure, the parameter for demodulating PDCCH or EPDCCH of the second UE includes one or any combination of the following parameters:

a transmission mode of the second UE;

an identity of the second UE;

scrambling code information of the PDCCH or EPDCCH of the second UE.

Preferably, in order to reduce network resource overhead, in a possible implementation, the network side may configure one or more parameter subsets for the first UE through higher layer signaling, where one parameter subset includes a set of possible parameters for demodulating the PDCCH of the second UE, and all the parameters included in one parameter subset are of the same kind. Correspondingly, the first UE may receive index information of parameters of the PDCCH of the second UE in the parameter subset, which is sent by the network side through dynamic signaling or semi-static signaling, and the first UE acquires corresponding parameters in the parameter subset according to the index information to demodulate the PDCCH of the second UE.

If the scheduling of the second UE is implemented by the EPDCCH, the first UE further needs to demodulate the EPDCCH of the second UE to obtain the transmission parameter of the second UE for interference suppression. In this case, in step 601, the parameters for demodulating EPDCCH of the second UE further include one or any combination of the following parameters:

1) the number of EPDCCH subsets;

2) PRB indices in each EPDCCH subset;

3) the EPDCCH subset is a local EPDCCH subset or a distributed EPDCCH subset;

4) the subframe where the EPDCCH is monitored;

5) a carrier indication field is configured for the carrier, an EPDCCH in the carrier needs to be monitored;

6) EPDCCH aggregation levels need to be monitored.

In order to reduce network resource overhead, in a possible implementation, the network side may configure one or more parameter subsets for the first UE through higher layer signaling, where the subset includes a set of possible parameters for demodulating EPDCCH of the second UE, and all parameters included in one parameter subset are of the same kind. Correspondingly, the first UE may receive index information of the parameter of the EPDCCH of the second UE in the parameter subset sent by the network side through dynamic signaling or semi-static signaling, and the first UE acquires the corresponding parameter in the parameter subset according to the index information to demodulate the EPDCCH of the second UE.

In the above embodiment of the present invention, after the network side determines the first UE and the second UE, the network side indicates interference information for the first UE, so that the first UE can perform interference suppression on a signal of the second UE according to the interference information. In the process, the network side can obtain the interference information related to the second UE and further send the interference information to the first UE, so that the first UE performs interference suppression on the signal of the second UE according to the interference information.

Based on the same technical concept, the embodiment of the invention also provides a base station.

Referring to fig. 7, a schematic structural diagram of a base station provided in the embodiment of the present invention is shown, where the base station may include a determining module 71 and an indicating module 72, where:

a determining module 71, configured to determine a first UE and a second UE, where intra-cell interference or inter-cell interference exists between the first UE and the second UE;

an indicating module 72, configured to indicate interference information to the first UE through dynamic signaling or semi-static signaling, so that the first UE performs interference suppression on a signal of the second UE according to the interference information.

Preferably, the indication module 72 may be specifically configured to: indicating the interference information through a PDCCH or EPDCCH of the first UE.

Preferably, the indication module 72 may be specifically configured to: indicating transmission parameters of the second UE to the first UE, wherein the transmission parameters of the second UE indicated to the first UE comprise one or any combination of the following parameters:

the number of CRSs of the antenna ports and mapping scheme information;

MSBFN subframe configuration information;

PDSCH starting symbol position information;

CSI-RS resource information, wherein the CSI-RS resource comprises a zero-power CSI-RS resource power and a non-zero-power CSI-RS resource;

signal power information, the signal power comprising a PA or comprising

The PA represents the ratio of the power of the data subcarrier of the orthogonal frequency division multiplexing symbol without the pilot frequency to the power of the pilot frequency subcarrier, and the PB represents the ratio of the power of the data subcarrier of the orthogonal frequency division multiplexing symbol with the pilot frequency to the power of the pilot frequency subcarrier;

MCS；

a UE identity;

RI，PMI；

indication information of whether interference is present;

and scrambling code information.

The meaning and indication manner of the transmission parameters may refer to the description in the method flow, and are not described herein again.

Preferably, the indication module 72 may send first indication information to the first UE, where the first indication information is used to indicate one or any combination of the following:

Preferably, the indication module 72 may further determine the kind of the transmission parameter of the second UE that needs to be indicated to the first UE according to the type of the receiver of the first UE.

Preferably, the indication module 72 may indicate the parameter for demodulating PDCCH or EPDCCH of the second UE to the first UE, so that the first UE obtains the transmission parameter of the second UE by demodulating PDCCH or EPDCCH of the second UE.

Preferably, the parameter for demodulating PDCCH or EPDCCH of the second UE includes one or any combination of the following parameters:

a transmission mode of the second UE;

an identity of the second UE;

scrambling code information of the PDCCH or EPDCCH of the second UE.

Further, the parameters for demodulating EPDCCH of the second UE further include one or any combination of the following parameters:

the number of EPDCCH subsets;

PRB indices in each EPDCCH subset;

the EPDCCH subset is a local EPDCCH subset or a distributed EPDCCH subset;

the subframe where the EPDCCH is monitored;

whether CIF is configured for the carrier, an EPDCCH in the carrier needing to be monitored;

EPDCCH aggregation levels need to be monitored.

Based on the same technical concept, the embodiment of the invention provides user equipment.

Referring to fig. 8, which is a schematic structural diagram of a user equipment provided in an embodiment of the present invention, the user equipment may include: an acquisition module 81 and an interference suppression module 82. For convenience of description, the user equipment is referred to herein as a first UE. In the UE:

an obtaining module 81, configured to obtain the indicated interference information through a dynamic signaling or a semi-static signaling;

an interference suppression module 82, configured to perform interference suppression on a signal of a second UE according to the indicated interference information, where intra-cell interference or inter-cell interference exists between the first UE and the second UE.

Preferably, the obtaining module 81 may be specifically configured to: and acquiring the interference information according to the dynamic signaling transmitted by the PDCCH or EPDCCH of the first UE.

Preferably, the obtaining module 81 may be specifically configured to: acquiring the transmission parameters of the second UE, where the acquisition of the transmission parameters of the second UE by the first UE includes one or any combination of the following parameters:

the number of CRSs of the antenna ports and mapping scheme information;

MSBFN subframe configuration information;

PDSCH starting symbol position information;

signal power information, the signal power information comprising a PA or comprising

MCS；

a UE identity;

RI，PMI；

indication information of whether interference is present;

and scrambling code information.

The meaning and the indication manner or the obtaining manner of the transmission parameters may refer to the description in the method flow, and are not described herein again.

Preferably, the obtaining module 81 may be specifically configured to: acquiring first indication information, wherein the first indication information is used for indicating one or any combination of the following contents:

Preferably, the obtaining module 81 may be specifically configured to: acquiring the indicated parameter for demodulating the PDCCH or EPDCCH of the second UE, wherein the first UE acquires the transmission parameter of the second UE by demodulating the PDCCH or EPDCCH of the second UE.

Wherein the indicated parameter for demodulating PDCCH or EPDCCH of the second UE comprises one or any combination of the following parameters:

a transmission mode of the second UE;

an identity of the second UE;

scrambling code information of the PDCCH or EPDCCH of the second UE.

the number of EPDCCH subsets;

PRB indices in each EPDCCH subset;

the EPDCCH subset is a local EPDCCH subset or a distributed EPDCCH subset;

the subframe where the EPDCCH is monitored;

whether a Carrier Indication Field (CIF) is configured for the carrier, wherein an EPDCCH in the carrier needs to be monitored;

EPDCCH aggregation levels need to be monitored.

Referring to fig. 9, a base station provided in an embodiment of the present invention includes:

the device comprises a processor 901, a memory 902, a transceiver 903 and a bus interface 904, wherein the processor 901, the memory 902 and the transceiver 903 are connected through the bus interface 904;

the processor 901 is configured to read a program in the memory 902, and determine a first UE and a second UE, where intra-cell interference or inter-cell interference exists between the first UE and the second UE;

the transceiver 903 is configured to indicate interference information to the first UE through dynamic signaling or semi-static signaling, so that the first UE performs interference suppression on a signal of the second UE according to the interference information.

The bus interface 904 is used to provide an interface, and the processor is responsible for managing the bus architecture and general processing.

Preferably, the processor 901 is specifically configured to: indicating the interference information through a PDCCH or EPDCCH of the first UE.

Preferably, the processor 901 is specifically configured to: indicating transmission parameters of the second UE to the first UE, wherein the transmission parameters of the second UE indicated to the first UE comprise one or any combination of the following parameters:

the number of CRSs of the antenna ports and mapping scheme information;

MSBFN subframe configuration information;

PDSCH starting symbol position information;

signal power information, the signal power comprising a PA or comprising

MCS；

a UE identity;

RI，PMI；

indication information of whether interference is present;

and scrambling code information.

Preferably, the processor 901 may send first indication information to the first UE, where the first indication information is used to indicate one or any combination of the following:

Preferably, the processor 901 may further determine the kind of the transmission parameter of the second UE that needs to be indicated to the first UE according to the type of the receiver of the first UE.

Preferably, the processor 901 may indicate the parameter for demodulating the PDCCH or EPDCCH of the second UE to the first UE, so that the first UE obtains the transmission parameter of the second UE by demodulating the PDCCH or EPDCCH of the second UE.

a transmission mode of the second UE;

an identity of the second UE;

scrambling code information of the PDCCH or EPDCCH of the second UE.

the number of EPDCCH subsets;

PRB indices in each EPDCCH subset;

the EPDCCH subset is a local EPDCCH subset or a distributed EPDCCH subset;

the subframe where the EPDCCH is monitored;

EPDCCH aggregation levels need to be monitored.

Based on the same inventive concept as the method, the embodiment of the invention also provides a terminal.

Referring to fig. 10, a terminal provided in an embodiment of the present invention includes

The system comprises a processor 1001, a memory 1002, a transceiver 1003 and a bus interface 1004, wherein the processor 1001, the memory 1002 and the transceiver 1003 are connected through the bus interface 1004;

the processor 1001 is configured to read a program in the storage area 1002, and obtain indicated interference information through dynamic signaling or semi-static signaling;

the transceiver 1003 is configured to receive and transmit the indicated interference information under the control of the processor 1001;

the processor 1001 is configured to perform interference suppression on a signal of the second UE according to the indicated interference information. Wherein intra-cell interference or inter-cell interference exists between the first UE and the second UE.

The bus interface 1004 is used to provide an interface, and the processor is responsible for managing the bus architecture and general processing.

Preferably, the processor 1001 may be specifically configured to: and acquiring the interference information according to the dynamic signaling transmitted by the PDCCH or EPDCCH of the first UE.

Preferably, the processor 1001 may be specifically configured to: acquiring the transmission parameters of the second UE, where the acquisition of the transmission parameters of the second UE by the first UE includes one or any combination of the following parameters:

the number of CRSs of the antenna ports and mapping scheme information;

MSBFN subframe configuration information;

PDSCH starting symbol position information;

The PA represents the ratio of the power of the data sub-carrier of the OFDM symbol without pilot frequency to the power of the pilot sub-carrier, and the PB represents the data of the OFDM symbol with pilot frequencyThe ratio of subcarrier power to pilot subcarrier power;

MCS；

a UE identity;

RI，PMI；

indication information of whether interference is present;

and scrambling code information.

Preferably, the processor 1001 may be specifically configured to: acquiring first indication information, wherein the first indication information is used for indicating one or any combination of the following contents:

Preferably, the processor 1001 may be specifically configured to: acquiring the indicated parameter for demodulating the PDCCH or EPDCCH of the second UE, wherein the first UE acquires the transmission parameter of the second UE by demodulating the PDCCH or EPDCCH of the second UE.

a transmission mode of the second UE;

an identity of the second UE;

scrambling code information of the PDCCH or EPDCCH of the second UE.

the number of EPDCCH subsets;

PRB indices in each EPDCCH subset;

the EPDCCH subset is a local EPDCCH subset or a distributed EPDCCH subset;

the subframe where the EPDCCH is monitored;

EPDCCH aggregation levels need to be monitored.

As shown in fig. 10, the bus architecture may include any number of interconnected buses and bridges, with one or more processors, represented by processor 1001, and various circuits, represented by memory 1002, 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 1003 may be a number of components, including a transmitter and a receiver, providing a means for communicating with various other apparatus over a transmission medium. The bus interface 1004 may also be an interface capable of interfacing externally to a desired device, including but not limited to a keypad, display, speaker, microphone, joystick, etc.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.

The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the invention.

It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.

Claims

1. An interference information indication method, comprising:

indicating interference information to the first UE through dynamic signaling or semi-static signaling so that the first UE performs interference suppression on a signal of the second UE according to the interference information;

wherein the indicating interference information to the first UE comprises: indicating transmission parameters of the second UE to the first UE, the transmission parameters including one or any combination of the following parameters:

determining, by the first UE, time-frequency resources occupied by a PDSCH of the second UE according to the number of antenna ports of the CRS of the cell reference signal and mapping scheme information, and performing interference suppression based on the time-frequency resources occupied by the PDSCH of the second UE;

multicast/multicast single frequency network MSBFN subframe configuration information, so that the first UE obtains corresponding MSBFN subframe configuration parameters according to the MSBFN subframe configuration information, and performs interference suppression on signals of the second UE based on the MSBFN subframe configuration parameters;

signal power information, the signal power comprising a PA or comprising

The PA represents a ratio of a data subcarrier power and a pilot subcarrier power of the ofdm symbol without pilot, and the PB represents a ratio of a data subcarrier power and a pilot subcarrier power of the ofdm symbol with pilot, so that the first UE reconstructs and cancels interference from the second UE.

2. The method of claim 1, wherein indicating the interference information to the first UE through dynamic signaling comprises:

3. The method of claim 1, wherein the transmission parameters include the signal power information, wherein indicating the transmission parameters of the second UE to the first UE comprises:

and sending the information of the absolute signal power of the second UE or sending the information of the proportional relation between the power of the second UE and the power of the first UE to the first UE.

4. The method of claim 1, wherein the transmission parameters include a Modulation and Coding Scheme (MCS) in addition to the number of antenna ports of the CRS and at least one of mapping scheme information, the MSBFN subframe configuration information, or the signal power information, the method further comprising:

sending the MCS of the second UE to the first UE, or sending a difference value between the MCS of the second UE and the MCS of the first UE;

the MCS is one or more, when the MCS is one, the MCS is the MCS corresponding to all physical resource block PRB pairs, and when the MCS is multiple, each MCS corresponds to one group of PRB pairs.

5. The method of claim 1, wherein the transmission parameters include scrambling code information in addition to the number of antenna ports for the CRS and at least one of mapping scheme information, the MSBFN subframe configuration information, or the signal power information, the method further comprising:

and sending the UE identification of the second UE, or the Virtual Cell Identification (VCID), or the scrambling identification (scrambling ID), or a function of more than one parameter to the first UE.

6. The method of any of claims 1 to 5, further comprising:

and indicating a demodulation sequence to the first UE to indicate the first UE to directly demodulate the data of the first UE, or firstly carrying out interference suppression on the signal of the second UE and then demodulating the data of the first UE.

7. An interference suppression method, comprising:

the first UE performs interference suppression on a signal of a second UE according to the indicated interference information, wherein intra-cell interference or inter-cell interference exists between the first UE and the second UE;

wherein the obtaining, by the first UE, the indicated interference information includes: the first UE acquires the indicated transmission parameters of the second UE; the transmission parameters comprise one or any combination of the following parameters:

signal power information, the signal power comprising a PA or comprising

8. The method of claim 7, wherein the first UE obtaining the transmission parameters of the second UE according to dynamic signaling comprises:

9. The method of claim 7, wherein the transmission parameters include the signal power information, wherein the first UE obtaining the indicated transmission parameters for the second UE comprises:

the first UE receives absolute signal power information of the second UE; or

And the first UE receives the information of the proportional relation between the power of the second UE and the power of the first UE, and determines the power of the second UE according to the power of the first UE and the proportional relation information.

10. The method of claim 7, wherein the transmission parameters include a Modulation and Coding Scheme (MCS) in addition to the number of antenna ports of the CRS and at least one of mapping scheme information, the MSBFN subframe configuration information, or the signal power information, the method further comprising: the first UE receiving an MCS for the second UE; or

The first UE receives the difference value of the MCS of the second UE and the MCS of the first UE, and the MCS of the second UE is determined according to the difference value and the MCS of the first UE;

wherein the MCS is one or more; and when the MCS is multiple, each MCS corresponds to one group of PRB pairs.

11. The method of claim 7, wherein the transmission parameters include scrambling code information in addition to the number of antenna ports for the CRS and at least one of mapping scheme information, the MSBFN subframe configuration information, or the signal power information, the method further comprising:

the first UE receives the second UE identity, or a virtual cell identity, VCID, or a scrambling identity, scrambling ID, or a function of one or more of the above parameters.

12. The method of any of claims 7 to 11, further comprising:

the first UE acquiring the indicated demodulation order;

and the first UE directly demodulates the data of the first UE according to the indicated demodulation sequence indication, or firstly carries out interference suppression on the signal of the second UE and then demodulates the data of the first UE.

13. A base station, comprising:

an indicating module, configured to indicate interference information to the first UE through dynamic signaling or semi-static signaling, so that the first UE performs interference suppression on a signal of the second UE according to the interference information;

wherein the indication module is specifically configured to: indicating transmission parameters of the second UE to the first UE, wherein the transmission parameters of the second UE indicated to the first UE comprise one or any combination of the following parameters:

signal power information, the signal power comprising a PA or comprising

Said PA representsAnd PB represents a ratio of the power of the data subcarrier to the power of the pilot subcarrier of the ofdm symbol with pilot, so that the first UE reconstructs and cancels interference from the second UE.

14. The base station of claim 13, wherein the indication module is specifically configured to:

15. A User Equipment (UE), which is a first UE, comprising:

an interference suppression module, configured to perform interference suppression on a signal of a second UE according to the indicated interference information, where intra-cell interference or inter-cell interference exists between the first UE and the second UE;

wherein the obtaining module is specifically configured to: acquiring the transmission parameters of the second UE, where the acquisition of the transmission parameters of the second UE by the first UE includes one or any combination of the following parameters:

signal power information, the signal power including a PA, orComprises that

16. The UE of claim 15, wherein the acquisition module is specifically configured to:

and acquiring the interference information according to a dynamic signaling transmitted by a Physical Downlink Control Channel (PDCCH) or an Enhanced Physical Downlink Control Channel (EPDCCH) of the first UE.