TW201717588A - Methods of and apparatuses for indicating and obtaining power allocation information in must system - Google Patents

Abstract

The invention relates to a method, in a base station of a Multiuser Superposition Transmission (MUST) system, for indicating power allocation information in a Demodulation-Reference Signal (DM-RS) based transmission mode, wherein the MUST system includes the base station, a first user equipment (UE), and a second UE, and the base station pairs the first UE and the second UE for multiuser superposition transmission; the first UE is a near UE of the base station, and the second UE is a far UE of the base station; and the method includes at the base station: obtaining a first DM-RS sequence used by the first UE, and a second DM-RS sequence used by the second UE; determining whether the first DM-RS sequence is consistent with the second DM-RS sequence; and sending a power allocation indication associated with obtaining power allocation information to the first UE based upon a result of the determination.

Description

Method and apparatus for indicating and obtaining power allocation information in a MUST system

The present invention relates generally to the field of wireless communications, and more particularly to a method for indicating a Demodulation Reference Signal (DM-RS) based transmission mode in a base station of a Multiuser Superposition Transmission (MUST) system. Method for power allocation information, a method for obtaining power allocation information based on a demodulation reference signal (DM-RS) transmission mode in a first user equipment of a multi-user cascading transmission (MUST) system, and a multi-user Means for indicating power allocation information based on a transmission mode of a demodulation reference signal (DM-RS) in a base station of a cascading transmission (MUST) system and a first user equipment in a multi-user cascade transmission (MUST) system Means for obtaining power allocation information based on a transmission mode of a demodulation reference signal (DM-RS).

In the work of the downlink MUST (see reference: 3GPP RP-150496, "Study on Downlink Multiuser Superposition Transmission for LTE", MediaTek Inc.), the research objective is to pair multiple UEs so that they can transmit simultaneously Layer of data without There are time, frequency and spatial layer separations (ie using the same spatial precoding vector or the same transmit diversity scheme on the same resource unit (RE)).

However, severe interference may occur between paired UEs. FIG. 1 shows a schematic diagram of a situation in which user devices UE paired in the MUST system 100 interfere with each other. As shown in FIG. 1, the MUST system 100 includes a base station eNB, a user equipment UE 1 and a user equipment UE 2, and the base station pairs the user equipment UE 1 and the user equipment UE 2 for MUST transmission. Since the user equipment UE 2 is located at the edge of the community, the base station eNB allocates a larger transmission power thereto, and the user equipment UE 1 located at the center of the community is allocated a relatively small transmission power. Upon receiving the downlink MUST transmission from the base station, the user equipment UE 1 with the advanced receiver first decodes the used signal from the received signal with the description of some auxiliary information provided to the user equipment UE1. The signal of the device UE 2 then removes the signal of the user equipment UE 2 from the received signal, and finally decodes the physical shared channel PDSCH data pointing to itself, that is, the user equipment UE1 from the remaining signals. Therefore, whether or not the interference signal generated by the user equipment UE 2 can be removed and the extent to which the user equipment UE 1 can remove the interference is crucial for the user equipment UE 1 to decode its own data.

In order to decode the signal of the user equipment UE2 at the user equipment UE1, information about the allocated transmission power between the paired user equipments is crucial to the receiver of the user equipment UE1. In the absence of power allocation information, in order to correctly decode out The interference signal at the near end user equipment, UE1, will be quite difficult, and this will also affect the near end user equipment UE1 after the interference is removed through the description of the decoded remote user equipment UE2. The decoding accuracy of the PDSCH data of its own physical downlink shared channel. However, in the MUST system, it is not specified in the standard how to specify the power allocation indication information from the base station eNB to the user equipment UE.

Therefore, how to enable the near-end user equipment UE1 to know through the indication of the base station eNB that its allocated transmit power and the allocated transmit power of the interfering user equipment, that is, the remote user equipment UE2, are worthy of the study.

There are currently ten different Transmission Modes (TMs) defined for LTE systems. The ten transmission modes differ in the specific antenna mapping structure and also in what reference signal is used for demodulation (corresponding community-specific split signal or demodulation reference signal (DM-RS)) and how The channel status information CSI is obtained by the terminal and fed back to the network side. The DM-RS, sometimes also referred to as user equipment specific reference signals, is intended for channel estimation by the terminal for subsequent transmission modes of 7 to 10 in DM-RS, also referred to as Transmission Mode TM based. The physical downlink of the time shares the coherent demodulation of the channel PDSCH.

Demodulation based on transmission mode TM is described in the document "3GPP 36.213, "3rd generation partnership project; technical specification group radio access network; emitted universal terrestrial radio access (e-utra); physical layer procedures" Reference signal DM-RS. If the user equipment specific reference signal appears on the PRB to which the corresponding PDSCH is mapped, the user equipment can assume the energy EPRE of each resource element of the PDSCH and the energy of each resource element of the user equipment specific reference signal. The ratio of EPRE is 0 dB for the number of transmission layers less than or equal to two and -3 dB for other cases (between transmission modes 9 and 10). Therefore, in most cases (except when the number of transmission layers is greater than two in transmission modes 9 and 10), the demodulation reference signal of the user equipment UE, that is, the power of the DM-RS, that is, the user equipment specific The power of the reference signal is equal to its PDSCH power. Thus, knowledge of its DM-RS sequence with indication is obtained from the base station eNB, and then the user equipment can know the power of its PDSCH channel.

However, in multi-user cascading transmissions, the paired user equipment uses the same spatial layer precoding matrix or the same transmission diversity over the same resource element RE. The paired user equipment can use the same demodulation reference signal sequence with the allocated transmission power and the different demodulation reference signal sequences over the same resource element RE. How to obtain the near-end/victim user equipment through the indication from the base station eNB and the decoding of the corresponding DM-RS sequence and obtain the power allocation information of the far-end/interfering user equipment at the near-end user equipment is not existing The 3GPP standard specifies that this will be difficult for the user equipment signal that first decodes and then eliminates interference and that later becomes difficult to decode its own data at the near-end/victim user device.

In order to overcome the technical problems described in the above background section, that is, the disadvantages of the prior art, the inventors of the present invention have proposed how to indicate power allocation to a near-end user equipment UE by a base station eNB in the case of a transmission mode based DM-RS. Information method.

Based on the above considerations, the present application proposes a method for indicating power allocation information based on a transmission mode of a demodulation reference signal (DM-RS) in a base station of a Multiuser Superposition Transmission (MUST) system, Method for obtaining power allocation information based on a demodulation reference signal (DM-RS) transmission mode in a first user equipment of a multi-user cascading transmission (MUST) system, a base station in a multi-user cascading transmission (MUST) system Means for indicating power allocation information based on a transmission mode of a demodulation reference signal (DM-RS) and a first user equipment in a multi-user cascade transmission (MUST) system for obtaining a demodulation-based reference signal (DM-RS) device for transmitting power allocation information in a mode.

According to a first aspect of the present invention, there is provided a method for indicating power allocation information based on a demodulation reference signal (DM-RS) based transmission mode in a base station of a multi-user cascading transmission (MUST) system, the multi-user The cascading transmission system includes a base station, a first user equipment, and a second user equipment, and the base station pairs the first user equipment and the second user equipment for multi-user cascading transmission, A user equipment is a near end user equipment of the base station, the second user equipment is a remote user equipment of the base station, and the method includes At the station: - obtaining a first demodulation reference signal sequence used by the first user equipment and a second demodulation reference signal sequence used by the second user equipment; - determining the first demodulation reference Whether the signal sequence is consistent with the second demodulation reference signal sequence; and transmitting a power allocation indication associated with obtaining the power allocation information to the first user equipment based on the determination result.

In an embodiment of the present invention, when the result of the determination is that the first demodulation reference signal sequence is consistent with the second demodulation reference signal sequence, the power allocation indication includes the first user equipment A power offset value between the transmit power and the transmit power of the second user equipment.

In an embodiment in accordance with the invention, the power allocation indication further comprises a community identification word.

In an embodiment of the present invention, when the determination result is that the first demodulation reference signal sequence is inconsistent with the second demodulation reference signal sequence, the power allocation indication includes the first user equipment. a first identification word of the first demodulation reference signal sequence used and a second identification word of the second demodulation reference signal sequence used by the second user equipment to distinguish the first user equipment from the Different demodulation reference signal sequences used by the second user equipment.

In an embodiment in accordance with the invention, the power allocation indication further includes a wireless network temporary identification indicator.

In accordance with an embodiment of the present invention, and obtaining power allocation resources The associated power allocation indication is sent to the first user equipment via higher layer signaling or downlink control information on a Physical Downlink Control Channel (PDCCH).

According to a second aspect of the present invention, a method for obtaining power allocation information based on a demodulation reference signal (DM-RS) based transmission mode in a first user equipment of a multi-user cascading transmission (MUST) system is proposed. The multi-user cascading transmission system includes a base station, a first user equipment, and a second user equipment, and the base station pairs the first user equipment and the second user equipment for multi-user cascading transmission The first user equipment is a near-end user equipment of the base station, the second user equipment is a remote user equipment of the base station, and the method is included at the first user equipment Receiving a power allocation indication associated with obtaining power allocation information from the base station; determining a first demodulation reference signal sequence used by the first user equipment based on content included in the power allocation indication And a second demodulation reference signal sequence used by the second user equipment and a first transmit power assigned to the first user equipment and a second transmit power of the second user equipment Radio power; and - decoding said first and second demodulation reference signal sequence and the first and second transmit power directed to the first user device downlink shared physical data channel.

In an embodiment in accordance with the present invention, when the first demodulation reference signal sequence and the second demodulation reference signal sequence are identical to each other and When the power allocation indication includes a power deviation value between the transmit power of the first user equipment and the transmit power of the second user equipment, the first user equipment decodes the first demodulation reference a signal sequence and/or the second demodulation reference signal sequence to obtain demodulation reference signal power as a sum of a transmit power of the first user equipment and a transmit power of the second user equipment and based on the And demodulating the reference signal power and the power deviation value to calculate a transmit power of the first user equipment and a transmit power of the second user equipment.

In an embodiment according to the present invention, when the first demodulation reference signal sequence and the second demodulation reference signal sequence are inconsistent with each other and the power allocation indication is included for distinguishing the first user a first identification word of the first demodulation reference signal sequence used by the first user equipment of the device and the different demodulation reference signal sequence used by the second user equipment, and the second user equipment When the second demodulation of the second identification word of the reference signal sequence, the first user equipment: - decoding the second demodulation reference signal sequence according to the second identification word to obtain an allocation to the second The second transmit power of the user equipment; - estimating a channel to decode a signal of the second user equipment based on the decoded second demodulation reference signal sequence and the second transmit power; Decoding the first demodulation reference signal sequence of the first user equipment after the second transmit power is removed from the signal received by the first user equipment to obtain the first user equipment The first transmit power; - eliminating interference of the second demodulation reference signal sequence with the first demodulation reference signal sequence and thereby estimating the channel in order to decode the first user equipment according to the first transmit power Physical downlink shared channel data.

In an embodiment of the present invention, the first user equipment obtains and obtains power allocation information from the base station through high layer signaling or downlink control information on a physical downlink control channel (PDCCH). The associated power allocation indication.

A companion according to the present invention proposes a device for indicating power allocation information based on a demodulation reference signal (DM-RS) based transmission mode in a base station of a multi-user cascading transmission (MUST) system, the multi-user The cascading transmission system includes a base station, a first user equipment, and a second user equipment, and the base station pairs the first user equipment and the second user equipment for multi-user cascading transmission, A user equipment is a near-end user equipment of the base station, the second user equipment is a remote user equipment of the base station, and the apparatus includes: an acquisition unit that acquires the first user a first demodulation reference signal sequence used by the device and a second demodulation reference signal sequence used by the second user equipment; a determination unit that determines the first demodulation reference signal sequence and the second Whether the demodulation reference signal sequence is consistent; and - a transmitting unit that transmits a power allocation indication associated with obtaining the power allocation information to the first user equipment based on the foregoing determination result.

According to a fourth aspect of the present invention, a multi-user cascading transmission is proposed (MUST) means for obtaining power allocation information based on a demodulation reference signal (DM-RS) based transmission mode in a first user equipment of the system, the multi-user cascade transmission system comprising a base station, a first user equipment And a second user equipment, and the base station pairs the first user equipment and the second user equipment for multi-user cascading transmission, the first user equipment being a near end of the base station a user equipment, the second user equipment is a remote user equipment of the base station, and the apparatus includes: a receiving unit that receives, from the base station, a power allocation indication associated with obtaining power allocation information; a determining unit that determines a first demodulation reference signal sequence used by the first user equipment and a second demodulation reference used by the second user equipment according to content included in the power allocation indication a signal sequence and a first transmit power assigned to the first user equipment and a second transmit power of the second user equipment; and a decoding unit according to the first and second And demodulating the reference signal sequence and the first and second transmit powers to decode physical downlink shared channel data directed to the first user equipment.

The scope of the present invention is defined by the scope of the appended claims. Those skilled in the art will be able to combine and modify the various features without departing from the spirit and scope of the invention. Among the scope of protection. The technical solution according to the present invention will be further explained below with reference to the accompanying drawings.

100‧‧‧MUST system

eNB‧‧‧ base station

UE1, UE 2‧‧‧ user equipment

Flow chart of the method of 200‧‧‧

210, 220, 230‧ ‧ steps

300‧‧‧ method flow chart

310, 320, 330‧ ‧ steps

The invention will be better understood, and the other objects, details, features and advantages of the invention will become more apparent. In the drawings: FIG. 1 shows a schematic diagram of a situation in which mutually matched UEs in a MUST system interfere with each other; FIG. 2 shows a base station in a multi-user cascade transmission MUST system according to an embodiment of the present invention. Flowchart 200 for indicating a method of power allocation information based on a transmission mode of a demodulation reference signal DM-RS; and FIG. 3 illustrates a multi-user cascading transmission MUST system according to an embodiment of the present invention A flowchart 300 of a method for obtaining power allocation information based on a transmission mode of a demodulation reference signal DM-RS in a user equipment.

Throughout the drawings, the same or similar reference numerals indicate the same or similar devices (module) or steps.

In the detailed description of the preferred embodiments that follow, reference is made to the accompanying drawings that form a part of the invention. The accompanying drawings illustrate, by way of example The exemplary embodiments are not intended to be exhaustive of all embodiments in accordance with the invention. It is to be understood that other embodiments may be utilized and structural or logical modifications may be made without departing from the scope of the invention. Therefore, the following detailed description is not limited. The scope of the invention is defined by the scope of the appended claims.

In the MUST system, the near-end UE should first decode the data directed to the remote UE, then remove the data of the far-end UE from the received transmission, and finally decode the data directed to itself from the remaining transmissions.

1 is a schematic diagram showing a situation in which a pair of UEs interfere with each other in a MUST system, which has been described in detail in the background section of the specification of the present invention, and therefore will not be described herein.

2 shows a flowchart 200 of a method for indicating power allocation information based on a transmission mode of a demodulation reference signal DM-RS in a base station of a multi-user cascading transmission MUST system, in accordance with one embodiment of the present invention. A method 200 for indicating power allocation information based on a demodulation reference signal (DM-RS) based transmission mode in a base station of a multi-user cascading transmission (MUST) system, including a multi-user cascading transmission system, can be seen from the figure. a base station, a first user equipment, and a second user equipment, and the base station pairs the first user equipment and the second user equipment for multi-user cascading transmission, and the first user equipment is a near-end user equipment of the base station The second user equipment is a remote user equipment of the base station, and the method includes: at the base station: first, the first demodulation reference signal sequence and the second used by the first user equipment are obtained by the base station in the method step 210 a second demodulation reference signal sequence used by the user equipment; then, the base station determines, in method step 220, whether the first demodulation reference signal sequence is identical to the second demodulation reference signal sequence; and finally, by the base station in the method In step 230, the work associated with obtaining the power allocation information is sent to the first user equipment based on the foregoing determination result. Rate allocation indication.

More specifically, the first user equipment and the second user equipment described above can use the same demodulation reference signal sequence or different demodulation reference signal sequences. In an embodiment of the present invention, when the determination result is that the first demodulation reference signal sequence is consistent with the second demodulation reference signal sequence, the power allocation indication includes the transmit power of the first user equipment and the second user. The power deviation between the transmit power of the device. Moreover, in one embodiment in accordance with the invention, the power allocation indication can also include a community identification word.

In contrast, in an embodiment according to the present invention, when the result of the determination is that the first demodulation reference signal sequence is inconsistent with the second demodulation reference signal sequence, the power allocation indication includes the first user equipment used. a first identification word of the first demodulation reference signal sequence and a second identification word of the second demodulation reference signal sequence used by the second user equipment to distinguish between the first user equipment and the second user equipment Demodulation reference signal sequence. Moreover, in one embodiment in accordance with the invention, the power allocation indication further includes a wireless network temporary identification indicator.

It should be understood by those skilled in the art that the above-mentioned power allocation indication associated with obtaining power allocation information can be transmitted to the first user equipment in a plurality of manners, for example, in an embodiment according to the present invention, and obtained. The power allocation indication associated with the power allocation information is sent to the first user equipment via higher layer signaling or downlink control information on a Physical Downlink Control Channel (PDCCH).

Figure 3 illustrates a multi-user layer in accordance with one embodiment of the present invention. A flowchart 300 of a method for obtaining power allocation information based on a transmission mode of a demodulation reference signal DM-RS in a first user equipment of a stacked transmission MUST system. A method 300 for obtaining power allocation information based on a demodulation reference signal (DM-RS) transmission mode in a first user equipment of a multi-user cascading transmission (MUST) system can be seen from the figure, multi-user cascading The transmission system includes a base station, a first user equipment, and a second user equipment, and the base station pairs the first user equipment and the second user equipment for multi-user cascading transmission, and the first user equipment is a near end of the base station The user equipment, the second user equipment is a remote user equipment of the base station, the method comprising: at the first user equipment: first receiving, in the first method step 310, the power associated with obtaining the power allocation information from the base station Assigning an indication; then determining, in a second method step 320, the first demodulation reference signal sequence used by the first user equipment and the second demodulation used by the second user equipment based on the content included in the power allocation indication a reference signal sequence and a first transmit power assigned to the first user equipment and a second transmit power of the second user equipment; and finally in a third party procedure The physical downlink shared channel data directed to the first user equipment is decoded according to the first and second demodulation reference signal sequences and the first and second transmit powers.

More specifically, the first user equipment and the second user equipment described above can use the same demodulation reference signal sequence or different demodulation reference signal sequences. In an embodiment in accordance with the invention, when the first demodulation reference signal sequence and the second demodulation reference signal sequence are consistent with each other and power The first user equipment decodes the first demodulation reference signal sequence and/or the second demodulation reference when the allocation indication includes a power deviation value between the transmit power of the first user equipment and the transmit power of the second user equipment. And a signal sequence to obtain a demodulation reference signal power that is a sum of a transmit power of the first user equipment and a transmit power of the second user equipment, and calculate the first user equipment based on the demodulation reference signal power and the power offset value Transmit power and transmit power of the second user equipment.

In contrast, in an embodiment according to the present invention, when the first demodulation reference signal sequence and the second demodulation reference signal sequence are inconsistent with each other and the power allocation indication is included for distinguishing the first user equipment and the a first identification word of the first demodulation reference signal sequence used by the first user equipment of the different demodulation reference signal sequences used by the user equipment and a second demodulation reference signal used by the second user equipment The second user equipment of the sequence: the first user equipment: - decoding the second demodulation reference signal sequence according to the second identification word to obtain a second transmission power allocated to the second user equipment; - according to the decoded Demodulating the reference signal sequence and the second transmit power to estimate the channel to decode the signal of the second user equipment; - decoding the first user after removing the second transmit power from the signal received by the first user equipment a first demodulation reference signal sequence of the device to obtain a first transmit power of the first user equipment; - canceling the second demodulation reference signal sequence according to the first transmit power To the first demodulation reference signal sequence interference and thereby estimating the channel, in order to decode the first downlink physical shared channel of the user device information.

It should be understood by those skilled in the art that the foregoing power allocation indication associated with obtaining power allocation information can be sent to the first user equipment in a plurality of manners, for example, in an embodiment in accordance with the present invention, The user equipment obtains a power allocation indication associated with obtaining power allocation information from the base station through higher layer signaling or downlink control information on a Physical Downlink Control Channel (PDCCH).

Furthermore, the invention also proposes a corresponding device for carrying out the above method. According to the present invention, there is provided an apparatus for indicating power allocation information based on a demodulation reference signal (DM-RS) transmission mode in a base station of a multi-user cascading transmission (MUST) system, the multi-user cascading transmission system including a base station, a first user device and a second user device, and the base station pairs the first user device and the second user device for multi-user cascading transmission, the first user device being a near-end user device of the base station, The user equipment is a remote user equipment of the base station, and the apparatus includes: an acquiring unit, which acquires a first demodulation reference signal sequence used by the first user equipment and a second solution used by the second user equipment a reference signal sequence; - a determining unit that determines whether the first demodulation reference signal sequence is identical to the second demodulation reference signal sequence; and - a transmitting unit that transmits and obtains power allocation to the first user equipment based on the determination result Information associated power allocation indication.

According to the present invention, there is also provided a device for obtaining power allocation information based on a demodulation reference signal (DM-RS) based transmission mode in a first user equipment of a multi-user cascading transmission (MUST) system, The user cascading transmission system includes a base station, a first user equipment, and a second user equipment, and the base station pairs the first user equipment and the second user equipment for multi-user cascading transmission, where the first user equipment is a base station a near-end user device, the second user device being a remote user device of the base station, the device comprising: - a receiving unit that receives a power allocation indication associated with obtaining power allocation information from the base station; - a determining unit, Determining, according to the content included in the power allocation indication, the first demodulation reference signal sequence used by the first user equipment and the second demodulation reference signal sequence used by the second user equipment, and assigning to the first user equipment a first transmit power and a second transmit power of the second user equipment; and - a decoding unit that decodes the first user device according to the first and second demodulation reference signal sequences and the first and second transmit powers Physical Downlink Shared Channel Profiles Those of ordinary skill in the art will also appreciate various examples described in connection with embodiments of the present invention. Logical blocks, modules, circuits, and algorithm steps may be implemented as a combination of electronic hardware, computer software, or both. To clearly illustrate this interchangeability between hardware and software, various illustrative components, blocks, modules, circuits, and steps are generally described in terms of their functionality. Whether this function is implemented as a hardware or as a software depends on the particular application and design constraints imposed on the overall system. Those skilled in the art can implement the described functions in a modified manner for each specific application, but such implementation decisions should not be construed as a departure from the present disclosure. The scope of protection of the invention.

It is apparent to those skilled in the art that the present invention is not limited to the details of the above-described exemplary embodiments, and the present invention can be embodied in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments are to be considered as illustrative and not limiting in any way. In addition, it is obvious that the word "comprising" does not exclude other elements and steps, and the word "a" does not exclude the plural. Multiple elements recited in the device claim can also be implemented by one element. The first, second, etc. words are used to denote names and do not denote any particular order.

The above description of the disclosure is provided to enable any person skilled in the art to make or use the invention. Various modifications of the present disclosure are obvious to those skilled in the art, and the general principles defined herein may be applied to other variations without departing from the spirit and scope of the invention. Thus, the present invention is not intended to be limited to the details of the details

Claims (12)

A method for indicating power allocation information based on a transmission mode of a demodulation reference signal (DM-RS) in a base station of a multi-user cascading transmission (MUST) system, the multi-user cascading transmission system including a base station, a first user a device and a second user device, and the base station pairs the first user device and the second user device for multi-user cascading transmission, the first user device being a near-end user device of the base station, The second user equipment is a remote user equipment of the base station, and the method includes: at the base station, acquiring a first demodulation reference signal sequence used by the first user equipment, and using the second user equipment a second demodulation reference signal sequence; determining whether the first demodulation reference signal sequence is consistent with the second demodulation reference signal sequence; and transmitting, according to the determination result, the first user equipment to the obtained power allocation information Power allocation indication. The method of claim 1, wherein the power allocation indication comprises the first user equipment when the result of the determination is that the first demodulation reference signal sequence is consistent with the second demodulation reference signal sequence A power offset value between the transmit power and the transmit power of the second user equipment. The method of claim 2, wherein the power allocation indication further comprises a community identification word. The method of claim 1, wherein the determination result is the first demodulation reference signal sequence and the second demodulation reference signal When the number sequence is inconsistent, the power allocation indication includes a first identifier of the first demodulation reference signal sequence used by the first user equipment and a second demodulation reference signal sequence used by the second user equipment. The second identification word distinguishes between different demodulation reference signal sequences used by the first user equipment and the second user equipment. The method of claim 4, wherein the power allocation indication further comprises a wireless network temporary identification indicator. The method of claim 1, wherein the power allocation indication associated with obtaining power allocation information is transmitted through higher layer signaling or downlink control information on a physical downlink control channel (PDCCH) To the first user device. A method for obtaining power allocation information based on a demodulation reference signal (DM-RS) based transmission mode in a first user equipment of a multi-user cascading transmission (MUST) system, the multi-user cascading transmission system comprising a base station, a first user equipment and a second user equipment, and the base station pairs the first user equipment and the second user equipment for multi-user cascading transmission, the first user equipment is a near end of the base station a user equipment, the second user equipment being a remote user equipment of the base station, the method comprising: at the first user equipment, receiving, from the base station, a power allocation indication associated with obtaining power allocation information; The content included in the power allocation indication determines a first demodulation reference signal sequence used by the first user equipment and a second demodulation reference signal sequence used by the second user equipment, and is allocated to the first use Decoding the first transmit power of the device and the second transmit power of the second user equipment; and decoding the first user according to the first and second demodulation reference signal sequences and the first and second transmit powers The physical downlink of the device shares channel data. The method of claim 7, wherein the first demodulation reference signal sequence and the second demodulation reference signal sequence are coincident with each other and the power allocation indication includes the transmit power of the first user equipment And the first user equipment decodes the first demodulation reference signal sequence and/or the second demodulation reference signal sequence to obtain the first Demodulating reference signal power of a sum of a transmit power of the user equipment and a transmit power of the second user equipment, and calculating a transmit power of the first user equipment based on the demodulation reference signal power and the power offset value The transmit power of the second user equipment. The method of claim 7, wherein the first demodulation reference signal sequence and the second demodulation reference signal sequence are inconsistent with each other and the power allocation indication includes for distinguishing the first user equipment a first identification word of the first demodulation reference signal sequence used by the first user equipment of the different demodulation reference signal sequence used by the second user equipment and a second used by the second user equipment Demodulating the second identification word of the reference signal sequence, the first user equipment: decoding the second demodulation reference signal sequence according to the second identification word to obtain the second transmission allocated to the second user equipment power; Estimating a channel to decode a signal of the second user equipment according to the decoded second demodulation reference signal sequence and the second transmit power; and transmitting the second transmit power from the first user equipment Decoding the first demodulation reference signal sequence of the first user equipment to obtain the first transmit power of the first user equipment; and canceling the second demodulation reference signal according to the first transmit power The sequence interferes with the first demodulation reference signal sequence and thereby estimates the channel to decode the physical downlink shared channel material of the first user equipment. The method of claim 7, wherein the first user equipment obtains and obtains power allocation from the base station through high layer signaling or downlink control information on a physical downlink control channel (PDCCH). The power allocation indication associated with the information. An apparatus for indicating power allocation information based on a transmission mode of a demodulation reference signal (DM-RS) in a base station of a multi-user cascading transmission (MUST) system, the multi-user cascading transmission system including a base station, a first user a device and a second user device, and the base station pairs the first user device and the second user device for multi-user cascading transmission, the first user device being a near-end user device of the base station, The second user equipment is a remote user equipment of the base station, and the apparatus includes: an acquiring unit, configured to acquire a first demodulation reference signal sequence used by the first user equipment, and used by the second user equipment a second demodulation reference signal sequence; a determining unit that determines whether the first demodulation reference signal sequence is consistent with the second demodulation reference signal sequence; and a transmitting unit that transmits, to the first user equipment, the associated power allocation information based on the determining result Power allocation indication. An apparatus for obtaining power allocation information based on a demodulation reference signal (DM-RS) based transmission mode in a first user equipment of a multi-user cascading transmission (MUST) system, the multi-user cascading transmission system comprising a base station, a first user equipment and a second user equipment, and the base station pairs the first user equipment and the second user equipment for multi-user cascading transmission, the first user equipment is a near end of the base station a user equipment, the second user equipment is a remote user equipment of the base station, the apparatus comprising: a receiving unit, receiving, from the base station, a power allocation indication associated with obtaining power allocation information; a determining unit, The content included in the power allocation indication determines a first demodulation reference signal sequence used by the first user equipment and a second demodulation reference signal sequence used by the second user equipment, and is allocated to the first use a first transmit power of the device and a second transmit power of the second user equipment; and a decoding unit according to the first and second demodulation reference signal sequences And the first and second transmit powers to decode physical downlink shared channel data directed to the first user equipment.