WO2013067689A1

WO2013067689A1 - Information feedback method, configuration method and device in coordinated multipoint transmission mode

Info

Publication number: WO2013067689A1
Application number: PCT/CN2011/081947
Authority: WO
Inventors: 张元涛; 王轶; 张翼; 周华
Original assignee: 富士通株式会社
Priority date: 2011-11-08
Filing date: 2011-11-08
Publication date: 2013-05-16
Also published as: CN103718593A

Abstract

Provided are an information feedback method and device in a coordinated multipoint transmission mode. The method includes: a terminal determining whether to feed back only one piece of rank information (RI) according to high layer configuration; if only one piece of RI is to be fed back, then the terminal feeding back to the network side the RI, precoding matrix information (PMI) and channel quality information (CQI) based on a hypothesis that only a master serving node performs sending, and feeding back to the network side the PMI and CQI of an adjacent serving node based on the RI which performs coordinated multipoint transmission (CoMP) with the master serving node according to the CoMP mode. The method and device provided by the embodiments of the present invention can reduce feedback overhead under the premise of supporting dynamic handover in various CoMP modes.

Description

Information feedback method, configuration method and device under cooperative multi-point transmission mode

The present invention relates to the field of communications, and in particular, to an information feedback method, a configuration method, and a device in a cooperative multipoint transmission mode. Background technique

Coordinated Multi-Point (CoMP) transmission is one of the important technologies in LTE-A Rel.ll. The main technologies of CoMP include the following three categories:

1. Joint Transmission (JT) refers to selecting two or more transmission points from multiple candidate transmission points to simultaneously transmit data to one or more mobile stations, as shown in Figure 1(a).

2. Dynamic Point Selection (DPS) refers to dynamically selecting one of the multiple candidate transmission points to send data to a mobile station, as shown in Figure 1(b).

3. Coordinated Scheduling/Coordinated Beamforming (CS/CB) means that each transmitting point sends data to its own mobile station, but the precoding matrix used by the transmitting end satisfies a specific relationship, such as The precoding matrix used by each transmission point is orthogonal or the like to reduce interference, as shown in Fig. 1(c).

Currently, in order to support different CoMP technologies, mobile stations need to provide corresponding feedback, including Rank Information (RI), Precoding Matrix Information (PMI), and Channel Quality Information (CQI). For different CoMP technologies, some corresponding specific content needs to be fed back, for example,

1. For JT, feedback aggregation CQI is required, that is, multi-point connection and transmission of calculated CQI;

2. For DPS, it is necessary to independently feedback the CQI when each transmission point is sent separately;

3. For CS/CB, it is necessary to feed back the CQI after the recommended PMI at the adjacent transmission point.

In the process of implementing the present invention, the inventors have found that according to the current discussion of LTE-A (Long Term Evolution-Advanced), it is necessary to define a general feedback framework for these three CoMP technologies to support all of them. CoMP technology. Method 1 is to feed back all the CQI/PMI/RI corresponding to the three CoMP technologies. Method 2 defines different feedback contents for various CoMP modes in a common framework. It can be seen that the former supports dynamic switching of various CoMP modes, and the latter can reduce the overhead of feedback compared to the former. It should be noted that the above description of the technical background is only for the purpose of facilitating the clear and complete description of the technical solutions of the present invention, and is convenient for understanding by those skilled in the art. The above technical solutions are not considered to be well known to those skilled in the art simply because these aspects are set forth in the background section of the present invention. Summary of the invention

The purpose of the embodiments of the present invention is to provide an information feedback method, a configuration method, and a device in a cooperative multi-point transmission mode, so as to reduce the feedback overhead under the premise of supporting dynamic switching of various CoMP modes.

According to an aspect of the embodiments of the present invention, an information feedback method in a cooperative multi-point transmission mode is provided, where the method includes:

The terminal determines, according to the high-level configuration, whether only one rank information (RI) is fed back;

If only one RI is fed back, the terminal feeds back to the network side based on the RI, precoding matrix information (PMI) and channel quality information (CQI) that only the primary service point transmits the hypothesis, and according to the cooperative multipoint (CoMP) transmission mode, to the network. The side feedback is based on the RI-based PMI and CQI of the adjacent service point where the primary service point is CoMP.

According to another aspect of the embodiments of the present invention, an information feedback configuration method in a cooperative multi-point transmission mode is provided, where the method includes:

The base station configures the number of RIs that need to be fed back by the terminal according to the CoMP transmission mode of the terminal, and/or the calculation mode of the RI of the primary service point, and/or the calculation condition of the RI in the CoMP transmission mode;

The base station sends the configured number of RIs that need to be fed back by the terminal, and/or the calculation mode of the RI of the primary service point, and/or the calculation condition of the RI in the CoMP transmission mode to the terminal through high layer signaling.

According to still another aspect of the embodiments of the present invention, a terminal device is provided, where the terminal device includes:

a first determining unit, determining, according to the high layer configuration, whether only one rank information (RI) is fed back;

a first feedback unit that feeds back to the network side based on the RI, precoding matrix information (PMI), and channel quality information (CQI) that only the primary service point transmits the hypothesis, and feeds back to the network side according to the cooperative multipoint (CoMP) transmission mode. The RI-based PMI and CQI of the adjacent service point that performs CoMP with the primary service point.

According to still another aspect of the embodiments of the present invention, a base station is provided, where the base station includes: a configuration unit, configured to configure, according to a CoMP transmission manner of the terminal, a number of RIs that need to be fed back by the terminal, and/or a primary service point The calculation method of RI, and/or the calculation condition of RI in CoMP transmission mode;

a sending unit, which configures the number of RIs that need to be fed back by the configuration unit, and/or a primary service The calculation method of the RI of the point, and/or the calculation condition of the RI in the CoMP transmission mode is sent by the high layer signaling to an aspect according to an embodiment of the present invention, and provides a computer readable program, wherein, in the terminal device When the program is executed, the program causes the computer to execute the information feedback method in the cooperative multipoint transmission mode described above in the terminal device.

According to another aspect of the present invention, a storage medium storing a computer readable program, wherein the computer readable program causes a computer to perform an information feedback method in the cooperative multipoint transmission mode described above in a terminal device .

According to still another aspect of the embodiments of the present invention, a computer readable program is provided, wherein, when the program is executed in a base station, the program causes a computer to execute information in the cooperative base station in the cooperative multipoint transmission mode in the base station Feedback configuration method.

According to still another aspect of the embodiments of the present invention, a storage medium storing a computer readable program, wherein the computer readable program causes a computer to perform an information feedback configuration method in a cooperative multipoint transmission mode in a base station .

The beneficial effects of the embodiments of the present invention are: the information feedback method, the configuration method and the device in the cooperative multi-point transmission mode of the embodiment of the present invention provide a general feedback framework for the cooperative multi-point transmission mode, and can support various cooperations. Under the premise of dynamic switching of multi-point transmission mode, the overhead of feedback is reduced.

Specific embodiments of the present invention are disclosed in detail with reference to the following description and the accompanying drawings, which illustrate the manner in which the principles of the invention can be employed. It should be understood that the embodiments of the invention are not limited in scope. The embodiments of the present invention include many variations, modifications, and equivalents within the spirit and scope of the appended claims.

Features described and/or illustrated with respect to one embodiment may be used in the same or similar manner in one or more other embodiments, in combination with, or in place of, features in other embodiments. .

It should be emphasized that the term "comprising" or "comprising" is used to mean the presence of a feature, component, step or component, but does not exclude the presence or addition of one or more other features, components, steps or components. DRAWINGS

Many aspects of the invention can be better understood with reference to the following drawings. The components in the figures are not drawn to scale, but only to illustrate the principles of the invention. In order to facilitate the illustration and description of some parts of the invention, the figures The corresponding part may be enlarged or reduced. Elements and features described in one of the figures or one embodiment of the invention may be combined with elements and features illustrated in one or more other figures or embodiments. In the accompanying drawings, like reference numerals refer to the In the drawing:

Figure 1 (a) is a schematic diagram of the transmission of the JT mode in the CoMP transmission mode;

Figure 1 (b) is a schematic diagram of the transmission of the DPS mode in the CoMP transmission mode;

Figure 1 (c) is a schematic diagram of the transmission of the CS/CB mode in the CoMP transmission mode;

2 is a flowchart of an information feedback method according to an embodiment of the present invention;

Figure 3 (a) is a schematic diagram of transmitting data to a terminal by using JT or CS/CB in two macro cells in a homogeneous network;

Figure 3 (b) is a schematic diagram of a macro cell and a micro cell in a heterogeneous network transmitting data to a terminal by using a DPS method;

4 is a flow chart of a method for the terminal to feed back the RI, PMI, and CQI of the primary service transmission point to the network side; FIG. 5 is a flowchart of a method for the terminal to feed back the RI and CQI in the JT mode to the network side;

6 is a flowchart of a method for the terminal to feed back the RI, PMI, and CQI in the JT mode to the network side; FIG. 7 is a flowchart of a method for the terminal to feed back the RI, PMI, and CQI in the JT mode to the network side; FIG. 8 is a flowchart of the present invention. Example flow chart of information feedback configuration method;

9 is a schematic structural diagram of a terminal device according to an embodiment of the present invention;

FIG. 10 is a schematic diagram showing the composition of a base station according to an embodiment of the present invention. detailed description

The foregoing and other features of the embodiments of the invention will be apparent from the These embodiments are merely exemplary and are not limiting of the invention. The embodiments of the present invention are described by taking the CoMP transmission mode in the LTE-A system as an example, but it can be understood that the embodiments of the present invention are not limited to the embodiments of the present invention. The above system is applicable to other systems involving multi-point cooperative transmission.

Example 1

An embodiment of the present invention provides an information feedback method in a cooperative multi-point transmission mode. Referring to FIG. 2, the method includes: Step 201: The terminal determines whether to feed back only one rank information (RI) according to the high-level configuration. Step 202: If only one RI is fed back, the terminal feeds back to the network side based on the RI and precoding matrix information (PMI) when only the primary service point sends the hypothesis. And channel quality information (CQI), and according to the cooperative multi-point (CoMP) transmission mode, feed back to the network side the PRI based on the RI of the adjacent service point of the CoMP with the primary service point and in step 201, due to In some scenarios, a certain CoMP transmission technology is used. The RI value calculated by the CoMP transmission technology has the same possibility of being based on the RI value only when the primary service point is transmitted. For example, JT is used between two macro cells. Or CS/CB sends data to a mobile station (terminal), as shown in Figure 3 (a). In this case, in order to save the feedback overhead and save the complexity of calculating the RI of the mobile station, the base station configuration terminal only feedbacks according to the main The RI value obtained by the service point to the channel state calculation of this terminal. In other scenarios, a certain CoMP transmission technology is adopted, such as adopting DPS in a heterogeneous network, that is, dynamically selecting a macro cell or a micro cell to transmit data for the mobile station, when the mobile station is at the edge of the micro cell, as shown in FIG. 3 (b) As shown, the RI values obtained from the channel state calculations of the macro cell and the micro cell are likely to be different. If the forced setting is the same, the system capacity is lost. Therefore, in this embodiment, the high-level configuration allows the terminal to feed back only one RI value or feed back multiple RI values.

In step 201, if it is determined that only one RI is fed back according to the high layer configuration, according to step 202, the RI value is based on the RI value only when the primary service point transmits. In an embodiment of step 202, the RI value of the primary service point may be determined according to a high-level configuration, and the RI value obtained by the terminal according to the channel state of the primary service point to the terminal may be calculated, thereby solving the situation of FIG. 3 (a). The problem of increased feedback overhead due to feedback of multiple RIs. In another embodiment of step 202, the RI value of the primary service point may be determined according to a high-level configuration, and the RI value calculated by the terminal after CoMP is calculated, thereby solving the situation in FIG. 3(b) because only the primary service point is fed back. The loss of system capacity caused by RI.

Specifically, the step 202 can be implemented by using the method of FIG. 4. Referring to FIG. 4, the method includes: Step 401: The terminal determines, according to the high-level configuration, a calculation manner of the RI of the primary service point that needs to be fed back; The RI of the primary service point may be calculated by calculating the RI of the primary service point according to the channel state of the primary service point to the terminal; or calculating the RI according to the transmission hypothesis corresponding to the CoMP transmission mode, and using the calculated RI as the primary service point. RI. The above is just an example. In the specific implementation, other calculation methods can be configured according to the actual situation.

Step 402: The terminal calculates an RI of the primary service point according to a calculation manner of the RI of the primary service point; The calculation method of the RI of the primary service point is determined, and the terminal can calculate the RI of the primary service point according to the determined calculation method of the RI by using the existing method, and details are not described herein again.

Step 403: The terminal determines, according to the RI of the primary service point, a PMI of the primary service point.

Wherein, since each RI value corresponds to a set of codebooks, after determining the RI of the main service point, the PMI with the largest signal to noise ratio can be selected from the corresponding codebook according to the requirement of the signal to noise ratio. The specific implementation can be implemented by using the prior art, and details are not described herein again.

Step 404: The terminal calculates a CQI of the primary service point according to the RI and the PMI of the primary service point.

Where the RI and PMI of the primary service point are determined, the CQI of the primary service point can be calculated by using the prior art. Step 405: The terminal feeds back the RI, PMI, and CQI of the primary service point to the network side.

After the RI, PMI, and B CQI of the primary service point are determined through steps 402, 403, and 404, they can be fed back to the network side.

In step 201, the terminal feeds back to the network side that the RI, the PMI, and the CQI based on only the primary service point transmission hypothesis, and then, based on the foregoing RI, according to the CoMP transmission mode, feeds back to the network side the CoMP neighboring relationship with the primary service point. PMI and CQI of the service point. For example, if the CoMP transmission mode is the JT mode, the PMI and the aggregated CQI determined based on the above RI are also fed back to the network side for the neighboring service point that performs the JT with the primary service point; if the CoMP transmission mode is DPS or CS/CB, The PMI and CQI determined based on the above RI are also fed back to the network side for the neighboring service points that do DPS or CS/CB with the primary service point. The method for determining the PMI and the CQI (or the CQI) based on the RI of the RI is the same as that of the prior art, and is not described here.

In step 201, if it is determined that a plurality of RI values need to be fed back according to the high-level configuration, the method in this embodiment further includes the following steps:

Step 203: If multiple RIs are fed back, the terminal feeds back to the network side based on the RI, PMI, and B CQI when only the primary service point transmits the hypothesis, and determines the RI calculation condition of the cooperative multipoint (CoMP) transmission mode according to the high layer configuration, according to The RI calculation condition of the CoMP transmission mode feeds back the RI, PMI, and B CQI corresponding to the CoMP transmission mode to the network side.

In step 203, the method for determining, by the terminal, that only the primary service point transmits the assumed RI, PMI, and CQI is the same as or different from the method in step 202, in which the terminal determines that only the primary service point transmits the assumed RI, PMI, and CQI. For example, when the terminal determines that multiple RI values need to be fed back according to the high-level configuration, the terminal does not determine the calculation mode of the RI of the primary service point according to the high-level configuration, but directly according to the channel state of the primary service point to the terminal. The RI of the primary service point is calculated, and the corresponding PMI and CQI are determined according to the RI, and then the RI, PMI, and CQI are fed back to the network side. The specific calculation method is also the same as the existing method, and details are not described herein again.

For example, after the terminal calculates the RI of the primary service point according to the channel state of the primary service point to the terminal, the terminal can determine the PMI and CQI of the primary service point according to the following formula:

Arg max SINR{RI, PMI)

{l

CQI _SERVING = Q{siNR(RI _SERVING , PMI _SERVING )\

Among them, R PMI CQI is the selected RI, PMI and CQI. The function OTVR( ) is the signal-to-noise ratio obtained from the RI, PMI calculation, and the function β( ) is the quantization function.

In step 203, since the terminal needs to feed back multiple RI values, the calculation method of the RI corresponding to different CoMP transmission technologies is different. For example, for DPS, since a candidate point is dynamically selected in the candidate service point to send data to the terminal, The terminal needs to independently calculate the RI according to the channel state of each candidate service point to the terminal, and then perform feedback; for JT, since one or more points are selected among the candidate service points and the primary service point sends data to the terminal together, the terminal needs The RI is calculated based on the equivalent channel condition after the JT transmission, and then feedback is performed. Therefore, in this embodiment, the transmission hypothesis (that is, the calculation condition of the RI) when the RI is calculated by the high-level configuration terminal, that is, the RI is calculated independently according to the channel of each transmission point, or the RI is calculated according to the equivalent channel of the JT, based on In the high-level configuration, the terminal can determine the RI, PMI, and CQI in the CoMP transmission mode.

In an embodiment of step 203, if the upper layer is configured to calculate the RI according to the transmission hypothesis of the JT mode, that is, the CoMP transmission mode is the JT mode, the terminal notifies the RI, the PMI, and the corresponding primary service point when transmitting the hypothesis according to step 203. CQI, can also feed back to the network side the RI, PMI in the JT mode (the PMI of the adjacent service point with the JT of the main service point, or the PMI required by the main service point and the JT with the main service point) Neighboring service point PMI) and aggregate CQI.

If the terminal feeds back the RI in the JT mode and the PMI and the aggregated CQI of the neighboring service point that is the JT of the primary service point to the network side, the terminal can be implemented by the method shown in FIG. 5. Referring to FIG. 5, the method includes:

Step 501: The terminal calculates the RI of the JT mode according to the sending hypothesis of the JT mode.

Step 502: The terminal calculates the aggregated CQI of the JT mode according to the RI of the JT mode and the PMI when only the primary service point is sent, and the PMI of the neighboring service point that performs the JT with the primary service point.

Step 503: The terminal feeds back the RI of the JT mode to the network side, and performs the PMI of the adjacent service point of the JT with the primary service point and the above aggregated CQI.

In this embodiment, the terminal determines the PMI required by the primary service point according to the RI calculated in step 501. And the PMI of the adjacent service point of the JT with the primary service point, but when calculating the aggregated CQI, the terminal is calculated according to the PMI based on the PMI only sent by the primary service point and the neighboring service point of the JT with the primary service point. It is not calculated based on the PMI required by the primary service point and the PMI of the adjacent service point that does the JT with the primary service point. Therefore, when the information is fed back, the terminal does not feed back the PMI required by the primary service point, but only feeds back the PMI of the adjacent service point that makes the JT with the primary service point.

In this embodiment, the terminal does not feed back the PMI required by the primary service point in the JT mode but only feeds back the PMI of the adjacent service point that is the JT with the primary service point. In the following, the terminal firstly returns an example based on the RI, PMI, and CQI when only the primary service point is sent according to step 203, and assumes that the RI of the primary service point fed back is RI1=1, and the PMI is PMIl=kl. On the assumption of the JT method, the terminal calculates RI2=2, the main service point needs to adopt PMI2=k2, kl≠k2, and the PMI of the adjacent service point that makes the JT with the main service point is k3. If the terminal does not feed the PMI2 in the JT mode, the primary service point cannot know the index of the PMI used by the sender to do the JT. In order to avoid this situation, in this embodiment, if the terminal calculates RI1=1 according to the channel state of the primary service point, and the calculated PMI1 is the codeword with the index k1 in the codebook of RI1=1, if it is in JT The RI2=2 calculated under the transmission assumption condition is based on the nested structure of the existing LTE codebook, that is, any codeword in the codebook of RI2=2 contains a codebook with the same index as RI1=1. The codeword in the selected PMI2 is the codeword indexed as kl in the codebook of RI2=2. According to the embodiment, the CQI is aggregated, that is, the CQI in the JT mode is based on RI2=2.

PMI2=kl and the PMI of the adjacent service point that makes the JT with the primary service point, that is, k3, the calculated CQI value. According to this, if the terminal does not feed back PMI2, the primary service point can select PMI2 as the codeword with index k1 in RI2=2.

For example, in the case that the PMI of the primary service point in the JT mode is not fed back, the terminal can determine the RI and the aggregate CQI in the JT mode by the following formula:

(RIJT ) = arg max SINR(RI, PMI _SERVING , PMI _NEIGHBOUR (RI))

R/e{l,2,...,r}

CQI _JT = Q {SINR(RI _JT , PMI _SERVING , PMI _NEIGHBOUR (RI _JT ))!

Among them, RI _JT apologizes to the RI after JT. The PMI is selected based on the PMI when only the primary service point is sent, and C2/^ is the aggregated CQI after the JT. PM/^^^ R/ is the PMI value of the adjacent service point of the JT with the primary service point. The function is the signal to interference and noise ratio obtained from the RI, PMI calculation, and the function β( ) is a quantization function.

If the terminal feeds back to the network side the RI in the JT mode, the PMI to be used by the primary service point, and the PMI and the aggregated CQI of the adjacent service point that is the JT of the primary service point, the terminal can be implemented by the method shown in FIG. Referring to Figure 6, the method includes: Step 601: The terminal calculates the RI of the JT mode according to the sending hypothesis of the JT mode.

Step 602: The terminal determines, according to the RI of the JT mode, a PMI that is required to be used by the primary service point of the JT mode, and a PMI of a neighboring service point that is a JT with the primary service point.

Step 603: The terminal calculates the aggregated CQI of the JT mode according to the RI of the JT mode and the PMI that the primary service point needs to adopt, and the PMI of the adjacent service point that is the JT of the primary service point.

Step 604: The terminal feeds back the RI of the JT mode, the PMI required by the primary service point, and the PMI and the aggregate CQI of the adjacent service point of the JT as the primary service point to the network side.

In this embodiment, the terminal determines the PMI required by the primary service point and the PMI of the adjacent service point that is the JT with the primary service point according to the RI calculated in step 601. When calculating the aggregate CQI, the embodiment of FIG. 5 Differently, the terminal is calculated according to the PMI required by the primary service point and the PMI of the adjacent service point that makes the JT with the primary service point. Therefore, when the information is fed back, the terminal not only feeds back the PMI required by the main service point, but also feeds back the PMI of the adjacent service point that is the JT with the main service point.

In this embodiment, the terminal feeds back the calculated RI in the JT mode, the PMI and the aggregate CQI that are to be used by the primary service point, and the PMI of the neighboring service point that is the JT of the primary service point to the network side. Based on this, it is possible to confirm the RI, PMI, and CQI in the JT mode, and perform data transmission in the JT mode based on these parameters.

For example, in the case of feedback to the PMI required by the primary service point in the JT mode, the terminal can determine the RI, PMI, and CQI in the JT mode by the following formula:

(RIJT , ΡΜΙ _]Τ ) = arg max SINR(RI, PMI , PMI _NEIGHBOUR )

{l

CQI _JT = Q{SINR(RI _JT , PMI _JT )}

Among them, RI _JT , PMI _JT , CQI _JT is the selected RI for JT, the main service point needs to be adopted.

PMI and aggregate CQI, ΡΜ/„ _βί ^ is the PMI of the adjacent service point of the JT with the primary service point. Function) The signal-to-noise ratio obtained by the RI, PMI calculation, the function β( ) is a quantization function.

In another embodiment of step 203, if the upper layer is configured to calculate the RI according to the assumption of the DPS mode, the terminal feeds back the RI, PMI, and CQI in the DPS mode to the network side.

The terminal can determine the RI, PMI, and CQI in the DPS mode by using the method shown in FIG. 7 and feed back to the network side. Please refer to Figure 7, the method includes:

Step 701: The terminal calculates a respective RI according to a channel state of each sending point.

Step 702: The terminal determines a PMI of each sending point according to an RI of each sending point.

Step 703: The terminal calculates a CQI of each sending point according to the RI and PMI of each sending point. Step 704: The terminal feeds back the RI, PMI, and CQI of each sending point to the network side.

In this embodiment, the terminal can dynamically select its own required transmission point according to the calculated CQI of each transmission point.

In the above description of the first embodiment, the terminal first determines the number of RIs that need to be fed back according to the high-level configuration, and then performs corresponding feedback as an example for description. However, the present embodiment is not limited thereto, for example, in practice. During implementation, the RI, PMI, and CQI based on the transmission only by the primary service point may be directly fed back to the network side, and then it is determined according to the high-level configuration whether additional RI needs to be fed back, and if necessary, according to the CoMP transmission mode configured by the upper layer. The RI calculation condition feeds back the RI, PMI, and CQI corresponding to the CoMP transmission mode to the network side. The RI based on the transmission of only the primary service point may be calculated according to the channel state of the primary service point configured by the upper layer, or may be calculated according to the transmission assumption of the CoMP transmission mode configured by the upper layer. The RI, PMI, and CQI in the CoMP transmission mode are determined in the same manner as described above, and are not described here.

With the method of the embodiment of the present invention, the terminal firstly feeds back only the RI, PMI, and CQI under the assumption of the primary service point, where the RI may be configured by the upper layer to be calculated according to the channel state of the primary service point, or may be configured as a CoMP transmission mode. RI value. Then, the terminal determines whether to feed back an additional RI according to the high-level configuration. If the additional RI is fed back, the terminal determines, according to the high-level configuration, whether the RI of each transmission point is independently calculated according to the DPS transmission hypothesis and feedback, or whether the JT mode is calculated according to the JT transmission hypothesis. The RI of the equivalent channel and feedback. Then, the terminal feeds back the PMI (may not be fed back) required by the primary service point in the CoMP transmission mode and the PMI of the adjacent service point that performs CoMP with the primary service point according to the calculated RI and the corresponding transmission hypothesis. Finally, the terminal may be based on the previously determined RI and PMK based on the PMI only when the primary service point is sent, or the PMI required to be used by the primary service point in the CoMP transmission mode, and the adjacent service with the primary service point for CoMP. Point PMI and transmission hypothesis, calculate CQI in CoMP mode (may be aggregated CQI in JT mode, or CQI in each transmission point of DPS mode) and feedback. As a result, not only can the dynamic switching of the CoMP mode be supported, but also the feedback overhead is reduced.

Example 2

The embodiment of the present invention further provides an information feedback configuration method in a cooperative multi-point transmission mode. Referring to FIG. 8, the method includes:

Step 801: The base station configures, according to the CoMP transmission mode of the terminal, the number of RIs that need to be fed back by the terminal, and/or the calculation mode of the RI of the primary service point, and/or the calculation condition of the RI in the CoMP transmission mode;

Step 802: The base station sets the number of RIs that need to be fed back by the base station, and/or the RI of the primary service point. The calculation mode, and/or the calculation condition of the RI in the CoMP transmission mode is sent to the terminal through high layer signaling.

In this embodiment, the base station configures the number of RIs that need to be fed back by the terminal and sends the RI to the terminal through high-level signaling. The terminal can determine whether to feed back only one RI, and when it is determined that only one RI is fed back and multiple RIs need to be fed back. For a specific feedback policy, refer to Embodiment 1 for details.

In this embodiment, the base station configures the RI of the primary service point and sends the RI to the terminal through high layer signaling. The terminal may determine whether to calculate the RI of the primary service point according to the channel state of the primary service point to the terminal, or according to CoMP. For the RI, the RI is calculated and used as the RI of the primary service point. For details, refer to Embodiment 1, and details are not described herein again.

In this embodiment, the base station configures the RI calculation condition in the CoMP transmission mode and sends the RI calculation condition to the terminal through the high layer signaling. The terminal may determine whether to calculate the RI in the CoMP transmission mode independently according to the channel of each transmission point, or according to the JT. For the corresponding equivalent channel calculation RI, please refer to Embodiment 1 for details, and details are not described herein again.

Through the method of the embodiment, the base station can assist the terminal to perform the CoMP transmission mode as information feedback, and save the feedback overhead on the premise of supporting the dynamic switching of the CoMP transmission mode.

The embodiment of the present invention further provides a terminal device, as described in Embodiment 3 below. The principle of the terminal device solving the problem is similar to the information feedback method in the multi-point cooperative transmission mode of Embodiment 1. For the implementation of the method, refer to the implementation of the method, and the repetition will not be repeated.

Example 3

FIG. 9 is a schematic structural diagram of a terminal device according to an embodiment of the present invention. Referring to FIG. 3, the terminal device includes: a first determining unit 901, configured to determine, according to a high-level configuration, whether only one rank information (RI) is fed back;

a first feedback unit 902, which feeds back to the network side based on the RI, precoding matrix information (PMI), and channel quality information (CQI) that only the primary service point transmits the hypothesis, and according to the cooperative multipoint (CoMP) transmission mode, to the network side The RI-based PMI and CQI are fed back to the adjacent service point where the primary service point is CoMP.

In this embodiment, regardless of whether the first determining unit 901 determines whether only one RI is fed back, the first feedback unit 902 feeds back the RI, PMI, and CQI based on only the primary serving point transmission hypothesis to the network side.

In an embodiment, the first feedback unit 902 includes:

a first determining module 9021, which determines a calculation manner of the RI of the primary service point that needs to be fed back according to the high-level configuration; the first calculating module 9022 calculates the calculation manner of the RI of the primary service point determined by the first determining module 9021. The RI of the primary service point;

a second determining module 9023, which is determined according to an RI of the primary service point calculated by the first calculating module 9022 PMI of the main service point;

a second calculation module 9024, which calculates a CQI of the primary service point according to the RI of the primary service point calculated by the first calculation module 9022 and the PMI of the primary service point determined by the second determination module 9023;

a first feedback module 9025, which calculates the RI of the primary service point calculated by the first computing module 9022, the PMI of the primary service point determined by the second determining module 9023, and the primary calculated by the second computing module 9024 The CQI of the service point is fed back to the network side.

The calculation manner of the RI of the primary service point includes: calculating an RI according to a channel state of the primary service point to the terminal, and using the calculated RI as an RI based on only a primary service point transmission hypothesis; or, according to a CoMP transmission mode The corresponding transmission hypothesis calculates RI, and the calculated RI is taken as an RI based on the assumption that only the primary service point transmits.

In an embodiment, the terminal device further includes:

a second determining unit 903, when the first determining unit 901 determines to feed back multiple RIs, determining an RI calculation condition of a cooperative multipoint (CoMP) transmission mode according to a high layer configuration;

The second feedback unit 904 feeds back the RI, PMI, and CQI corresponding to the CoMP transmission mode to the network side according to the RI calculation condition of the CoMP transmission mode determined by the second determining unit 903.

In one embodiment, the second feedback unit 904 includes:

a third calculating module 9041, when the CoMP transmission mode is a joint transmission (JT) mode, calculating an RI of the JT mode according to the transmission hypothesis of the JT mode;

a fourth calculation module 9042, which is based on the RI of the JT mode calculated by the third calculation module 9041 and the PMI based on the assumption that only the primary service point transmits the hypothesis, and the PMI of the adjacent service point that performs the JT with the primary service point, Said JT mode of polymerization CQI;

a second feedback module 9043, which feeds back to the network side the JT mode RI calculated by the third calculation module 9041, the PMI of the adjacent service point that is the JT of the main service point, and the JT mode calculated by the fourth calculation module 9042. Aggregated CQI.

In another embodiment, the second feedback unit 904 includes:

The fifth calculating module 9044, when the CoMP transmission mode is a joint transmission (JT) mode, calculating the RI of the JT mode according to the transmission hypothesis of the JT mode;

a third determining module 9045, which determines, according to the RI of the JT mode calculated by the fifth calculating module 9044, a PMI that is required to be used by the primary service point of the JT mode, and a PMI of a neighboring service point that is a JT with the primary service point; a sixth calculating module 9046, which is based on the RI of the JT mode calculated by the fifth calculating module 9044 and the PMI required by the JT mode primary service point determined by the third determining module 9045, and the JT with the main service point Calculating the aggregated CQI of the JT mode by the PMI of the adjacent service point;

a third feedback module 9047, which feeds back to the network side the RI of the JT mode calculated by the fifth calculating module 9044, the PMI of the JT mode determined by the third determining module 9045, and the PMI of the adjacent service point that is the JT of the main service point. And the aggregated CQI of the JT mode calculated by the sixth calculation module 9046.

In another embodiment, the second feedback unit 904 includes:

a seventh calculating module 9048, when the CoMP transmission mode is a dynamic transmission point selection (DPS) mode, calculating respective RIs according to channel states of each transmission point;

a fourth determining module 9049, which determines a PMI of each transmitting point according to an RI of each transmitting point calculated by the seventh calculating module 9048;

An eighth calculation module 90410, which calculates a CQI of each transmission point according to the RI of each transmission point calculated by the seventh calculation module 9048 and the PMI of each transmission point determined by the fourth determination module 9049;

a fourth feedback module 90411, which feeds back to the network side the RI of each transmission point calculated by the seventh calculation module 9048, the PMI of each transmission point determined by the fourth determination module 9049, and the eighth calculation module 90410 Calculate the CQI of each transmission point.

The terminal device in the embodiment of the present invention can reduce the feedback overhead on the premise of supporting dynamic switching in the CoMP mode.

The embodiment of the present invention further provides a base station, which is similar to the information feedback configuration method in the multi-point cooperative transmission mode of Embodiment 2, as described in Embodiment 4 below. See the implementation of the method, and the repetition will not be repeated.

Example 4

10 is a schematic structural diagram of a base station according to an embodiment of the present invention. Referring to FIG. 10, the base station includes: a configuration unit 1001, configured to configure, according to a CoMP transmission manner of the terminal, a number of RIs that need to be fed back by the terminal, and/or a primary service point. The calculation method of RI, and/or the calculation condition of RI in CoMP transmission mode;

The sending unit 1002 sends the number of RIs that need to be fed back by the configuration unit, and/or the calculation mode of the RI of the primary service point, and/or the calculation condition of the RI in the CoMP transmission mode, by using high layer signaling. Give the terminal.

The base station in the embodiment of the present invention can assist the terminal in performing feedback in the CoMP transmission mode, and is configured in the terminal. Support for dynamic switching of CoMP transmission mode saves feedback overhead.

The embodiment of the present invention further provides a computer readable program, wherein when the program is executed in the terminal device, the program causes the computer to execute the information in the cooperative multipoint transmission mode described in Embodiment 1 in the terminal device. Feedback method.

The embodiment of the present invention further provides a storage medium storing a computer readable program, wherein the computer readable program causes the computer to execute the information feedback method in the cooperative multipoint transmission mode described in Embodiment 1 in the terminal device.

The embodiment of the present invention further provides a computer readable program, wherein when the program is executed in a base station, the program causes the computer to perform information feedback configuration in the cooperative multipoint transmission mode described in Embodiment 2 in the base station. method.

The embodiment of the present invention further provides a storage medium storing a computer readable program, wherein the computer readable program causes the computer to execute the information feedback configuration method in the cooperative multipoint transmission mode described in Embodiment 2 in the base station.

The above apparatus and method of the present invention may be implemented by hardware, or may be implemented by hardware in combination with software. The present invention relates to a computer readable program that, when executed by a logic component, enables the logic component to implement the apparatus or components described above, or to cause the logic component to implement the various methods described above Or steps. Logic components such as field programmable logic components, microprocessors, processors used in computers, and the like. The present invention also relates to a storage medium for storing the above program, such as a hard disk, a magnetic disk, an optical disk, a DVD, a flash memory, or the like.

The present invention has been described in connection with the specific embodiments thereof, and it should be understood by those skilled in the art that these descriptions are not intended to limit the scope of the invention. A person skilled in the art can make various modifications and changes to the invention in accordance with the spirit and the principles of the invention, which are also within the scope of the invention.

Claims

An information feedback method in a cooperative multi-point transmission mode, where the method includes:

The terminal determines whether to feed back only one rank information (RI) according to the high-level configuration;

If only one RI is fed back, the terminal feeds back to the network side based on the RI, precoding matrix information (PMI) and channel quality information (CQI) when only the primary service point transmits the hypothesis, and according to the cooperative multipoint (CoMP) transmission method, The network side feedback and the primary service point do CoMP adjacent service points are based on the PMI and CQI of the RI.

2. The method according to claim 1, wherein

If multiple RIs are fed back, the terminal feeds back to the network side based on the RI, PMI, and CQI when only the primary service point transmits the hypothesis, and determines the RI calculation condition of the cooperative multipoint (CoMP) transmission mode according to the high layer configuration, according to the CoMP transmission. The RI calculation condition of the mode feeds back to the network side the RI, PMI, and CQI corresponding to the CoMP transmission mode.

The method according to claim 1 or 2, wherein the terminal feeds back to the network side that the RI, the PMI, and the CQI based on only the primary service point transmission hypothesis include:

The terminal determines, according to the high-level configuration, a calculation manner of the RI of the primary service point that needs feedback;

The terminal calculates an RI of the primary service point according to a calculation manner of the RI of the primary service point;

The terminal determines a PMI of the primary service point according to the RI of the primary service point;

The terminal calculates a CQI of the primary service point according to the RI and the PMI of the primary service point;

The terminal feeds back the RI, PMI, and CQI of the primary service point to the network side.

4. The method according to claim 3, wherein the calculation manner of the RI of the primary service point comprises: calculating an RI according to a channel state of the primary service point to the terminal, and using the calculated RI as the only master based The RI at which the service point sends the hypothesis; or

The RI is calculated according to the transmission hypothesis corresponding to the CoMP transmission mode, and the calculated RI is used as the RI based on the assumption that only the primary service point transmits the hypothesis.

5. The method according to claim 2, wherein, if the CoMP transmission mode is a joint transmission (JT) mode, the terminal feeds back, to the network side, the RI, the PMI, and the aggregation corresponding to the transmission hypothesis of the JT mode according to the JT mode. CQI, specifically includes:

The terminal calculates the RI of the JT mode according to the sending hypothesis of the JT mode;

The terminal is based on the RI of the JT mode and based on the PMI when only the primary service point is sent, and with the primary service point Calculating the PMI of the adjacent service point of the JT, and calculating the aggregated CQI of the JT mode;

The terminal feeds back the RI of the JT mode to the network side, and performs PMI of the adjacent service point of the JT with the primary service point and aggregated CQI of the JT mode.

The method according to claim 2, wherein, if the CoMP transmission mode is a joint transmission (JT) mode, the terminal feeds back, to the network side, the RI, the PMI, and the aggregation corresponding to the transmission hypothesis of the JT mode according to the JT mode. CQI, specifically includes:

The terminal determines, according to the RI of the JT mode, a PMI that is required to be used by the primary service point of the JT mode and a PMI of a neighboring service point that is a JT with the primary service point;

The terminal calculates the aggregated CQI of the JT mode according to the RI of the JT mode and the PMI that the primary service point needs to adopt, and the PMI of the neighboring service point that performs the JT with the primary service point;

The terminal feeds back to the network side the RI of the JT mode, the PMI that the primary service point needs to adopt, the PMI of the adjacent service point that is the JT with the primary service point, and the aggregated CQI.

The method according to claim 2, wherein, if the CoMP transmission mode is a dynamic transmission point selection (DPS) mode, the terminal feeds back, to the network side, the RI and the PMI corresponding to the transmission hypothesis of the DPS mode according to the DPS mode. And CQI, specifically including:

The terminal calculates a respective RI according to a channel state of each transmission point to the terminal;

The terminal determines the PMI of each sending point according to the RI of each sending point;

The terminal calculates the CQI of each transmission point according to the RI and PMI of each transmission point;

The terminal feeds back the RI, PMI, and CQI of each transmission point to the network side.

The information feedback configuration method in the cooperative multi-point transmission mode, where the method includes: the base station configures the number of RIs that need to be fed back by the terminal according to the CoMP transmission mode of the terminal, and/or the calculation of the RI of the main service point. Mode, and/or calculation condition of RI in CoMP transmission mode;

A terminal device, where the terminal device includes:

a first determining unit, which determines whether to feed back only one rank information (RI) value according to the high layer configuration; and a first feedback unit that feeds back to the network side based on the RI, precoding matrix information (PMI), and channel that only the primary serving point transmits the hypothesis Quality information (CQI), and according to cooperative multipoint (CoMP) transmission method, to the network side The neighboring service points that feed back to the primary service point for CoMP are based on the PMI and CQI of the RI.

The terminal device according to claim 9, wherein the terminal device further includes:

a second determining unit, when the first determining unit determines to feed back a plurality of RIs, determining an RI calculation condition of a cooperative multipoint (CoMP) transmission mode according to a high layer configuration;

a second feedback unit that feeds back the RI, PMI, and CQI corresponding to the CoMP transmission mode to the network side according to the RI calculation condition of the CoMP transmission mode determined by the second determining unit.

The terminal device according to claim 9, wherein the first feedback unit comprises: a first determining module, configured to determine, according to a high-level configuration, a calculation manner of an RI of a primary service point that is required to be fed back; Calculating the RI of the primary service point according to the calculation manner of the RI of the primary service point determined by the first determining module;

a second determining module, which determines a PMI of the primary service point according to an RI of the primary service point calculated by the first computing module;

a second calculating module, which calculates a CQI of the main service point according to the RI of the primary service point calculated by the first computing module and the PMI of the primary service point determined by the second determining module;

a first feedback module, where the RI of the primary service point calculated by the first computing module, the PMI of the primary service point determined by the second determining module, and the CQI of the primary service point calculated by the second computing module Feedback to the network

The terminal device according to claim 11, wherein the calculation manner of the RI of the primary service point includes:

Calculating the RI according to the channel state of the primary service point to the terminal device, and using the calculated RI as an RI based on only the primary service point transmitting hypothesis; or

The RI is calculated according to the transmission hypothesis of the CoMP transmission mode, and the calculated RI is taken as an RI based on the assumption that only the primary service point transmits.

The terminal device according to claim 10, wherein the second feedback unit comprises: a third calculating module, configured to send according to the JT mode when the CoMP transmission mode is a joint transmission (JT) mode Assume that the RI of the JT mode is calculated;

a fourth calculation module, which calculates the JT mode according to the JT mode RI calculated by the third calculation module and the PMI based on only the primary service point transmission, and the PMI of the adjacent service point that performs the JT with the main service point Aggregated CQI; a second feedback module, which feeds back to the network side, the RI of the JT mode calculated by the third computing module, the PMI of the adjacent service point that is the JT of the primary service point, and the aggregated CQI of the JT mode calculated by the fourth computing module.

The terminal device according to claim 10, wherein the second feedback unit comprises: a fifth calculating module, configured to send according to the JT mode when the CoMP transmission mode is a joint transmission (JT) mode Assume that the RI of the JT mode is calculated;

a third determining module, which determines, according to the RI of the JT mode calculated by the fifth computing module, a PMI that is required to be used by the primary service point of the JT mode and a PMI of a neighboring service point that is a JT with the primary service point;

a sixth calculation module, which is based on the RI of the JT mode calculated by the fifth calculation module and the PMI required by the main service point of the JT mode determined by the third determination module, and the adjacent service of the JT with the main service point Point PMI, calculating the aggregated CQI of the JT mode;

a third feedback module, which feeds back to the network side the RI of the JT mode calculated by the fifth computing module, the PMI required by the third service point determined by the third determining module, and the neighboring service of the JT with the primary service point The PMI of the point and the aggregated CQI of the JT mode calculated by the sixth calculation module

The terminal device according to claim 10, wherein the second feedback unit comprises: a seventh calculation module, according to each transmission point when the CoMP transmission mode is a dynamic transmission point selection (DPS) mode Channel state calculates respective RI;

a fourth determining module, which determines a PMI of each sending point according to an RI of each sending point calculated by the seventh calculating module;

An eighth calculating module, which calculates a CQI of each transmitting point according to an RI of each transmitting point calculated by the seventh calculating module and a PMI of each transmitting point determined by the fourth determining module;

a fourth feedback module, which feeds back, to the network side, the RI of each transmission point calculated by the seventh calculation module, the PMI of each transmission point determined by the fourth determination module, and each calculated by the eighth calculation module Sending point CQI

16. A base station, where the base station includes:

a configuration unit, configured according to the CoMP transmission mode of the terminal, the number of RIs that need to be fed back by the terminal, and/or the calculation mode of the RI of the primary service point, and/or the calculation condition of the RI in the CoMP transmission mode;

a sending unit, which sends the number of RIs that need to be fed back by the configuration unit, and/or the calculation method of the RI of the primary service point, and/or the calculation condition of the RI in the CoMP transmission mode to the high-level signaling end

17. A computer readable program, wherein when the program is executed in a terminal device, the program causes the computer to perform the cooperative multipoint transmission mode according to any one of claims 1 to 7 in the terminal device Information feedback method.

A storage medium storing a computer readable program, wherein the computer readable program causes the computer to execute the information feedback method in the cooperative multipoint transmission mode according to any one of claims 1 to 7 in the terminal device.

A computer readable program, wherein the program causes the computer to execute the information feedback configuration method in the cooperative multipoint transmission mode according to claim 8 in the terminal device when the program is executed in the terminal device.

A storage medium storing a computer readable program, wherein the computer readable program causes the computer to execute the information feedback configuration method in the cooperative multipoint transmission mode according to claim 8 in the terminal device.