WO2016155507A1

WO2016155507A1 - Method in ue supporting multiuser superposition, method in base station supporting multiuser superposition, and devices

Info

Publication number: WO2016155507A1
Application number: PCT/CN2016/076610
Authority: WO
Inventors: 张晓博
Original assignee: 上海朗帛通信技术有限公司
Priority date: 2015-03-27
Filing date: 2016-03-17
Publication date: 2016-10-06
Also published as: CN106162851B; CN106162851A

Abstract

Disclosed are a method in a UE supporting multiuser superposition, a method in a base station supporting multiuser superposition, and devices. In step one, a UE receives first signalling, the first signalling indicating K1 candidate power values; in step two, second signalling is received, the second signalling indicating a first power value; in step three, a first wireless signal is received. K1 is greater than 1, the first signalling is higher layer signalling, the second signalling is physical layer signalling, the first power value is a transmission power of the first wireless signal on a given time-frequency resource, and the first power value is one of the K1 candidate power values. The present invention supports CRS-based multiuser superposition, supports a multiuser superposition UE dynamically switching to a non-multiuser superposition state, and dynamically adjusts a downlink transmission power so as to obtain a higher transmission efficiency. In addition, the present invention reduces DCI overhead.

Description

Method and device in UE and base station supporting multi-user superposition

Technical field

The present invention relates to a scheme for downlink power adjustment in a wireless communication system, and more particularly to a method and apparatus for power adjustment of a multi-position superposition based on LTE-Long Term Evolution.

Background technique

In the traditional 3GPP (3rd Generation Partner Project) cellular system, the downlink wireless signals of multiple users are through {TDM (Time Division Multiplexing), FDM (Frequency Division Multiplexing). ), one or more of CDM (Code Division Multiplexing) is implemented. A new research topic (RP-150496) is introduced in 3GPP R (Release, Release) 13, which is a downlink multi-user overlay. The essence is to distinguish the downlink wireless of two UEs (User Equipment) by using different transmission powers. signal. The two UEs generally include one near UE (ie, close to the base station) and one far UE (ie, far from the base station), and the base station allocates lower transmit power for the first signal that the target receiver is the near UE, and simultaneously receives the target. The second signal of the far UE is assigned a higher transmission power. The far UE directly demodulates the second signal (ie, the first signal is processed as noise), and the near UE first demodulates the second signal (considering that the UE near the UE has a lower path loss, the probability of successful decoding is high. And then removing the influence of the second signal from the received signal to obtain a residual signal, and decoding the remaining signal to obtain a first signal, which is an SIC (Successive Interference Cancellation) algorithm.

In the existing LTE system, a demodulation RS (Reference Signal) of physical layer data transmitted on a PDSCH (Physical Downlink Shared Channel) is based on a CRS (Cell Reference Signal) or URS (UE-specific Reference Signal). For the CRS-based PDSCH, the base station configures the transmit power through higher layer signaling, and for the URS-based PDSCH, the base station can dynamically control the transmit power using the URS. In the above downlink multi-user overlay scenario, the first signal and the second signal may be based on CRS or URS, respectively, that is, the demodulation RS of the {first signal, the second signal} may have four combinations:

-Combination one.{CRS, CRS}

- Combination 2. {URS, URS}

-Combination III.{CRS, URS}

- Combination 4. {URS, CRS}

In the paper published by NTTDocomo, a multi-user superimposed MIMO (Multi Input Multi Output) scheme is proposed for the above combination 2, that is, multi-user superposition can only be implemented in the same beam (Beam), between beams Still using traditional space division multiplexing, the two users who are superimposed can share the same URS to save air interface overhead.

The inventors found through research that the above NTTDocomo solution may face the following problems:

- When the interference between the beams is severe, the target receiver is a wireless signal of the far UE, and the success rate of the near UE capable of correctly decoding may be similar (or slightly higher) than the far UE. If the near UE cannot decode correctly, the subsequent SIC operation cannot be performed, which greatly reduces the system gain of the multi-user overlay.

-. Multi-user overlays cannot be applied to traditional CRS-based users (ie, combinations one, three, four). CRS-based downlink transmission plays an important role in LTE, especially for scenarios where far UE or CSI (Channel Status Information) reliability is poor. Therefore, multi-user overlay should support CRS-based downlink transmission.

Summary of the invention

The inventors have found through research that the (at least) near UE in the multi-user overlay should be able to dynamically switch to the non-multi-user overlay state - otherwise the transmission efficiency of the near UE may be seriously degraded (limited by the transmission power). Further, the interference between beams in multi-antenna transmission may be serious, and the downlink transmission based on CRS should also become a multi-user superposition method. In LTE, the transmit power of the CRS-based PDSCH is usually configured through high-layer signaling, and it is difficult to meet the power adjustment requirements of the multi-user superimposed UE. The traditional dynamic closed-loop power control method dynamically adjusts the power according to the step size (that is, each dynamic signaling can adjust one power step compared to the previous transmission power), and cannot meet the power adjustment requirement of the multi-user superimposed UE. .

In response to the above problems, the present invention provides a solution. It should be noted that, in the case of no conflict, the features in the embodiments and embodiments in the UE of the present application can be applied to the base station, and vice versa. Further, the features of the embodiments and the embodiments of the present application may be combined with each other arbitrarily without conflict.

The invention discloses a method in a UE supporting multi-user superposition, which comprises the following steps:

Step A. Receive first signaling, the first signaling indicating K1 candidate power values

- Step B. Receive second signaling, the second signaling indicating the first power value

Step C. Receive the first wireless signal.

Wherein, the K1 is greater than 1, the first signaling is high layer signaling, the second signaling is physical layer signaling, and the first power value is a sending power of the first wireless signal on the given timing resource, the first power value Is one of the K1 candidate power values.

Compared with the traditional dynamic power control, the above method is characterized in that the base station can dynamically adjust the downlink transmission power in one step. In the existing cellular communication, the one-step adjustment of the downlink transmission power may cause the UE's AGC (Auto Gain Control) to fail to work normally (ie, the above method violates common knowledge). The inventors have found through research that the above method is reasonable in multi-user superimposed transmission because the AGC is set according to the total power of the superimposed downlink wireless signals for two (or even more) UEs.

As an embodiment, the K1 is 2. As an embodiment, the UE is a near UE. As an embodiment, the K1 is 3, and the UE is a near UE or a far UE in a multi-user overlay. As an embodiment, the unit of the power value is dBm (millimeters). As an embodiment, the unit of the power value is mW (milliwatts).

In one embodiment, the given timing resource is one subcarrier in a wideband symbol, and the wideband symbol is {OFDM (Orthogonal Frequency Division Multiplexing) symbol, SC-FDMA (Single Carrier Frequency) Division Multiple Access (Single Carrier Frequency Division Multiple Access) symbol, one of MC-CDMA (Multi Carrier Code Division Multiple Access) symbols, SCMA (Sparse Code Multiple Access) symbol} .

As an embodiment, the given timing resource refers to an RE (Resource Element) in an OFDM symbol that does not include a CRS, and the first power value is an EPRE in the OFDM symbol that does not include the CRS.

As an embodiment, the first wireless signal is transmitted by the CRS antenna port. As a sub-embodiment of this embodiment, the first signaling indicates a power difference of the K1 candidate power values compared to the CRS EPRE.

As an embodiment, the first wireless signal is transmitted by an antenna port other than the URS (UE specific reference signal) antenna port.

Specifically, according to an aspect of the present invention, the UE determines the first power value according to one of the following

- Select a signaling format for the second signaling

- Select two. K2 information bits in the second signaling

Wherein K2 is a positive integer.

The selection one and the selection two are independent and not coupled to each other. The essence of the selection one is that the second signaling implicitly indicates the first power value, and the load size of the second signaling is reduced. The essence of the second selection is that the second signaling explicitly indicates the first power value, which provides a higher flexibility. The difference between the selection 2 and the LTE DCI (Downlink Control Information) format 1D is: The latter indicates, by 1 bit, whether the current transmit power is configured (the higher layer signaling configuration) or the configured transmit power minus 3 dB, that is, the base station can only configure one transmit power, and the selected two The K1 candidate power values are fully configurable.

As an embodiment, the K2 is 1. As an embodiment, the K2 information bits indicate an index of the first power value in the K1 candidate power values.

Specifically, according to an aspect of the present invention, the UE determines a first power value according to the selecting, and the second signaling is scheduling signaling of the first wireless signal. If the signaling format of the second signaling includes information bits related to multi-user superposition, the first power value is the first candidate power value, and otherwise the first power value is the second candidate power value.

In one embodiment, the information bits related to the multi-user superposition include: {Radio Network Temporary Identity of the target radio signal, configuration information of the target radio signal (resource allocation information, etc.), target wireless At least one of statistical information of a signal (information such as transmission power) and information of scheduling signaling of a target wireless signal, the target wireless signal being a wireless signal superimposed with the first wireless signal. As an embodiment, the second candidate power value is not greater than the first candidate power value.

As an embodiment, the difference between the second candidate power value and the CRS EPRE is indicated by RRC (Radio Resource Control) signaling p-a.

As an embodiment, if the signaling format of the second signaling does not include information bits related to multi-user superposition, the signaling format of the second signaling is DCI format {1, 1A, 1B, 1C, 1D, One of 2, 2A}.

Specifically, in accordance with an aspect of the present invention, the step C further includes the following steps:

Step C0. Receive a second wireless signal, remove the component of the second wireless signal from the received signal, and then receive the first wireless signal.

The time-frequency resource occupied by the first wireless signal and the time-frequency resource occupied by the second wireless signal all or partially overlap.

In the above aspect, the UE is a near UE.

Specifically, according to an aspect of the invention, the second signaling indicates the second power value. The second power value is the transmit power of the second wireless signal on the given timing resource.

As an embodiment, the second wireless signal is transmitted by the CRS antenna port. As an embodiment, the second power value is indicated by 3 information bits in the second signaling, the 3 information bits indicating the difference between the second power value and the CRS EPRE.

As an embodiment, the second signaling directly indicates the second power value.

The invention discloses a method in a base station supporting multi-user superposition, which comprises the following steps:

- Step A. Sending first signaling, the first signaling indicating K1 candidate power values

- Step B. Sending second signaling, the second signaling indicating the first power value

- Step C. Send the first wireless signal.

Specifically, according to an aspect of the invention, the base station indicates the first power value by one of:

- Select a signaling format for the second signaling

- Select two. K2 information bits in the second signaling

Wherein K2 is a positive integer.

Specifically, according to an aspect of the present invention, the base station indicates the first power value by using the selection, and the second signaling is scheduling signaling of the first wireless signal. If the signaling format of the second signaling includes information bits related to multi-user superposition, the first power value is the first candidate power value, and otherwise the first power value is the second candidate power value.

- Step C0. Send a second wireless signal.

The invention discloses a user equipment supporting multi-user overlay, wherein the following modules are included:

The first module is configured to receive the first signaling, where the first signaling indicates K1 candidate power values

The second module is configured to receive the second signaling, where the second signaling indicates the first power value

The third module is configured to receive the first wireless signal.

As an embodiment, the user equipment determines the first power value according to the signaling format of the second signaling.

As an embodiment, the user equipment determines the first power value according to the K2 information bits in the second signaling. Wherein K2 is a positive integer.

The invention discloses a base station device supporting multi-user superposition, wherein the following modules are included:

The first module is configured to send first signaling, where the first signaling indicates K1 candidate power values

The second module is configured to send the second signaling, where the second signaling indicates the first power value

The third module is configured to send the first wireless signal.

As an embodiment, the base station device indicates the first power value by using a signaling format of the second signaling.

As an embodiment, the base station device indicates the first power value by using K2 information bits in the second signaling. Wherein K2 is a positive integer.

Compared with the prior art, the present invention has the following technical advantages:

-. Support CRS-based multi-user overlay

- The UE supporting multi-user superposition dynamically switches to the non-multi-user superposition state, and dynamically adjusts the downlink transmission power to obtain higher transmission efficiency.

- Determine the transmit power according to the signaling format, saving DCI overhead.

DRAWINGS

Other features, objects, and advantages of the present invention will become more apparent from the Detailed Description of Description

1 shows a transmission flow diagram of a downlink multi-user overlay in accordance with one embodiment of the present invention;

2 is a schematic diagram showing resource allocation of a first wireless signal and a second wireless signal according to an embodiment of the present invention;

3 is a schematic diagram showing a far UE adopting transmit diversity and a near user using closed loop multi-antenna transmission according to an embodiment of the present invention;

FIG. 4 is a block diagram showing the structure of a processing device in a UE according to an embodiment of the present invention; FIG.

FIG. 5 is a block diagram showing the structure of a processing device in a base station according to an embodiment of the present invention; FIG.

detailed description

The technical solutions of the present invention will be further described in detail below with reference to the accompanying drawings. It should be noted that the features of the embodiments and the embodiments of the present application may be combined with each other without conflict.

Example 1

Embodiment 1 illustrates a transmission flow chart of downlink multi-user overlay, as shown in FIG. In FIG. 1, the base station N1 is a serving cell of the UE U2 and a maintenance base station of the serving cell of the UE U3.

For UE U2 , receiving the first signaling in step S21, the first signaling indicating K1 candidate power values; receiving the second signaling in step S22, the second signaling indicating the first power value; receiving in step S23 The second wireless signal receives the component of the second wireless signal from the received signal and then receives the first wireless signal.

For the base station N1 , the first signaling is transmitted in step S11; the second signaling is transmitted in step S12; and the first wireless signal and the second wireless signal are transmitted in step S13.

For UE U3 , in step S31, a second wireless signal is received.

In Embodiment 1, the K1 is greater than 1, the first signaling is high layer signaling, the second signaling is physical layer signaling, and the first power value is a sending power of the first wireless signal on a given frequency resource, A power value is one of the K1 candidate power values. The time-frequency resource occupied by the first wireless signal and the time-frequency resource occupied by the second wireless signal are all or partially coincident.

As a sub-embodiment 1 of Embodiment 1, the K1 is 2, and the K1 candidate power values include {a first candidate power value, a second candidate power value}, and the UE U2 is configured according to the second signaling in step S22. The DCI format determines a first power value. If the signaling format of the second signaling includes information bits related to multi-user superposition, the first power value is a first candidate power value, and otherwise the first power value is a second candidate power value. .

As a sub-embodiment 2 of Embodiment 1, the second signaling is scheduling signaling of the first wireless signal, the second wireless signal is transmitted by the CRS antenna port, and the second signaling indicates the second power value. The second power value is the transmit power of the second wireless signal on the given timing resource.

As a sub-embodiment 3 of Embodiment 1, the second signaling indicates a second power value. The second power value is the transmit power of the second wireless signal on the given timing resource.

As a sub-embodiment 4 of the first embodiment, the time resources occupied by the first wireless signal and the first wireless signal are completely coincident, and the first wireless signal and the frequency resource occupied by the first wireless signal partially overlap.

Example 2

Embodiment 2 exemplifies a resource allocation diagram of a first wireless signal and a second wireless signal in a pair of overlapping PRBs (Physical Resource Blocks), as shown in FIG. 2 . In FIG. 2, the square marked by the thick line frame is CRS RE, and the square filled by the cross line is DMRS (Demodulation Reference Signal) RE, and the blank square marked by the thin line is the first wireless signal and the first Two wireless signals are occupied.

In Embodiment 2, one of the {first wireless signal, second wireless signal} according to the present invention is transmitted by the CRS antenna port, and the other is transmitted by the DMRS antenna port.

As a sub-embodiment 1 of embodiment 2, the first wireless signal is transmitted by the CRS antenna port, and the first wireless signal is punctured or rate matched at the position of the DMRS RE.

As a sub-embodiment 2 of Embodiment 2, the first wireless signal is transmitted by the DMRS antenna port, and the second wireless signal also occupies the DMRS RE (ie, the square of the cross-line identification). An advantage of the sub-embodiment 2 is that a legacy UE (not aware of the presence of a near UE) can serve as a far UE for multi-user overlay. Considering that the target UE of the first wireless signal (ie, the near UE) first performs SIC, the second wireless signal It does not cause interference to the DMRS of the first wireless signal.

As a sub-embodiment 3 of Embodiment 2, the first power value in the present invention is an EPRE of a first radio signal on an OFDM symbol not including a CRS, and the first radio signal is compared to an EPRE on an OFDM symbol including a CRS. The ratio of the first power value is configured by higher layer signaling (pb).

Example 3

Embodiment 3 exemplifies a schematic diagram in which a far UE adopts transmit diversity and a near user uses closed loop multi-antenna transmission, as shown in FIG. In FIG. 3, the base station N2 is a maintenance base station of a serving cell of the UE {U4, U5, U6}, the UE {U4, U5} is a near UE, and the UE U6 is a far UE. As shown in Figure 3. The closed-loop multi-antenna transmission refers to multi-antenna transmission performed by the base station, depending on CSI (Channel Status Information) or SRS (Sounding Reference Signal), including but not limited to beamforming. Space division multiplexing and other methods. The transmit diversity refers to a CSI or SRS that the base station does not rely on UE feedback, including but not limited to CDD (Cyclic Delay Diversity), STBC (Space-Time Block Coding), and SFBC (Space-Frequency). Coding, space frequency block code) and other methods.

In Embodiment 3, the base station N2 schedules the UEs U4, U5, and U6 on the same time-frequency resource. The UE{U4, U5} adopts a closed-loop multi-antenna transmission mode (indicated by a thick line ellipse and a thin line ellipse respectively), and the UE U6 adopts a multi-antenna transmission mode of transmission diversity (as indicated by a broken line). The UE{U4, U5} is transmitted by means of space division multiplexing, and the UE{U4, U6} and {U5, U6} are respectively transmitted by multi-user superposition.

As a sub-embodiment 1 of Embodiment 3, the target UE of the first radio signal in the present invention is the UE U6 (ie, the associated RNTI of the first radio signal is the RNTI of the UE U6), and the target of the second radio signal in the present invention The UE is UE U4 or UE U5. The first wireless signal is transmitted by the CRS antenna port. The advantage of the sub-embodiment 1 is that the base station N2 can dynamically determine whether to increase the transmission power of the first wireless signal according to whether the UE U6 is in the multi-user superposition state (to ensure that there is a second radio signal interference, the UE U6 can Correctly receive the first wireless signal).

As a sub-embodiment 2 of the embodiment 3, the target UE of the first radio signal in the present invention is the UE U4 or the UE U5, and the target UE of the second radio signal in the present invention is the UE U6. Both the first wireless signal and the second wireless signal are transmitted by the CRS antenna port. The advantage of the sub-embodiment 1 is that the base station N2 can dynamically determine whether to reduce the transmission power of the first wireless signal according to whether the UE U4 or the UE U5 is in the multi-user superposition state (to avoid causing strong interference to the second wireless signal).

Example 4

Embodiment 4 exemplifies a structural block diagram of a processing device in one UE, as shown in FIG. In FIG. 4, the UE processing apparatus 200 is mainly composed of a first receiving module 201, a second receiving module 202, and a third receiving module 203.

The first receiving module 201 is configured to receive first signaling, where the first signaling indicates K1 candidate power values. The second receiving module 202 is configured to receive the second signaling, where the second signaling indicates the first power value. The third receiving module 203 is configured to receive the first wireless signal.

In Embodiment 4, the K1 is greater than 1, the first signaling is RRC signaling, the second signaling is physical layer signaling, and the first power value is a transmission power of the first wireless signal on the given timing resource, A power value is one of the K1 candidate power values. The K1 candidate power values are independent of each other

As a sub-embodiment 1 of the embodiment 4, the second receiving module 202 determines a first power value according to a signaling format of the second signaling, where the second signaling is scheduling signaling of the first wireless signal. If the signaling format of the second signaling includes information bits related to multi-user superposition, the first power value is the first candidate power value, and otherwise the first power value is the second candidate power value.

Example 5

Embodiment 5 exemplifies a structural block diagram of a processing device in a base station, as shown in FIG. In FIG. 5, the base station processing apparatus 300 is mainly composed of a first sending module 301, a second sending module 302, and a third transmitting module 303.

The first sending module 301 is configured to send first signaling, where the first signaling indicates K1 candidate power values. The second sending module 302 is configured to send the second signaling, where the second signaling indicates the first power value. The second sending module 302 is configured to send the first wireless signal.

In Embodiment 5, the K1 is greater than 1, the first signaling is high layer signaling, the second signaling is physical layer signaling, and the first power value is a sending power of the first wireless signal on a given frequency resource, A power value is one of the K1 candidate power values.

As a sub-embodiment 1 of embodiment 5, the second signaling is a scheduling DCI of the first wireless signal.

As a sub-embodiment 2 of the embodiment 5, the second signaling includes one information bit, where the one information bit is used to indicate that the first power value is one of the K1 candidate power values, the K1 Is 2.

As a sub-embodiment 3 of Embodiment 5, the first signaling directly indicates the K1 candidate power values.

One of ordinary skill in the art can appreciate that all or part of the above steps can be completed by a program to instruct related hardware, and the program can be stored in a computer readable storage medium such as a read only memory, a hard disk or an optical disk. Alternatively, all or part of the steps of the above embodiments may also be implemented using one or more integrated circuits. Correspondingly, each module unit in the above embodiment may be implemented in hardware form or in the form of a software function module. The application is not limited to any specific combination of software and hardware. The UE in the present invention includes, but is not limited to, a wireless communication device such as a mobile phone, a tablet computer, a notebook, and an internet card. The base station in the present invention includes, but is not limited to, a macro communication base station, a micro cell base station, a home base station, a relay base station, and the like.

The above is only the preferred embodiment of the present invention and is not intended to limit the scope of the present invention. All modifications, equivalents, improvements, etc., made within the spirit and scope of the invention are intended to be included within the scope of the invention.

Claims

A method in a UE supporting multi-user overlay, comprising the following steps:

Step A. Receive first signaling, the first signaling indicating K1 candidate power values

- Step B. Receive second signaling, the second signaling indicating the first power value

- step C. receiving the first wireless signal;

Wherein, the K1 is greater than 1, the first signaling is high layer signaling, the second signaling is physical layer signaling, and the first power value is a sending power of the first wireless signal on the given timing resource, the first power value Is one of the K1 candidate power values.
The method in a UE supporting multi-user superposition according to claim 1, wherein the UE determines the first power value according to one of the following

- Select a signaling format for the second signaling

- Select two. K2 information bits in the second signaling

Wherein K2 is a positive integer.
The method according to claim 2, wherein the UE determines a first power value according to the selecting, and the second signaling is scheduling signaling of the first wireless signal; The signaling format of the second signaling includes information bits related to multi-user superposition, the first power value is a first candidate power value, and the first power value is a second candidate power value.
The method of the multi-user superimposed UE according to any one of claims 1 to 3, wherein the step C further comprises the following steps:

Step C0. Receiving a second wireless signal, removing a component of the second wireless signal from the received signal, and then receiving the first wireless signal;

The time-frequency resource occupied by the first wireless signal and the time-frequency resource occupied by the second wireless signal all or partially overlap.
The method according to claim 4, wherein the second signaling indicates a second power value, wherein the second power value is the second wireless signal on the given timing resource Transmit power.
A method in a base station supporting multi-user superposition, comprising the following steps:

- Step A. Sending first signaling, the first signaling indicating K1 candidate power values

- Step B. Sending second signaling, the second signaling indicating the first power value

- step C. transmitting a first wireless signal;

Wherein, the K1 is greater than 1, the first signaling is high layer signaling, and the second signaling is physical layer signaling. The first power value is the transmit power of the first wireless signal on the given timing resource, and the first power value is one of the K1 candidate power values.
The method in a base station supporting multi-user superposition according to claim 6, wherein the base station indicates the first power value by one of:

- Select a signaling format for the second signaling

- Select two. K2 information bits in the second signaling

Wherein K2 is a positive integer.
The method according to claim 7, wherein the base station indicates the first power value by using the selection, and the second signaling is scheduling signaling of the first wireless signal; The signaling format of the second signaling includes information bits related to multi-user superposition, the first power value is a first candidate power value, and the first power value is a second candidate power value.
The method of the base station supporting multi-user superposition according to any one of claims 6-8, wherein the step C further comprises the following steps:

- step C0. transmitting a second wireless signal;

The time-frequency resource occupied by the first wireless signal and the time-frequency resource occupied by the second wireless signal all or partially overlap.
The method according to claim 9, wherein the second signaling indicates a second power value; wherein the second power value is the second wireless signal on the given timing resource Transmit power.
A user equipment supporting multi-user overlay, wherein the following modules are included:

The first module is configured to receive the first signaling, where the first signaling indicates K1 candidate power values

The second module is configured to receive the second signaling, where the second signaling indicates the first power value

a third module: configured to receive the first wireless signal;

Wherein, the K1 is greater than 1, the first signaling is high layer signaling, the second signaling is physical layer signaling, and the first power value is a sending power of the first wireless signal on the given timing resource, the first power value Is one of the K1 candidate power values.
A base station device supporting multi-user overlay, wherein the following modules are included:

The first module is configured to send first signaling, where the first signaling indicates K1 candidate power values

The second module is configured to send the second signaling, where the second signaling indicates the first power value

a third module: configured to send the first wireless signal;

Wherein, the K1 is greater than 1, the first signaling is high layer signaling, the second signaling is physical layer signaling, and the first power value is a sending power of the first wireless signal on the given timing resource, the first power value Is one of the K1 candidate power values.