WO2016112867A1 - Method for reporting channel state information, user equipment, and system - Google Patents

Abstract

Disclosed are a method for reporting channel state information, a user equipment and a system. The method for reporting channel state information comprises: receiving multiple reference signals respectively configured by a network side device for multiple CSI Processes; determining, according to a preset time interval and a preset rule, an effective sub-frame from target sub-frames respectively occupied by the multiple reference signals, wherein a time interval between two neighboring effective sub-frames that correspond to the reference signals is not less than the preset time interval; calculating, according to the reference signals transmitted in the effective sub-frames respectively corresponding to the multiple reference signals, CSI respectively corresponding to the multiple CSI Processes; and feeding back the CSI to the network side device. By using the present invention, calculation complexity of the channel state information can be lowered and hardware costs can be reduced.

Description

Method, user equipment and system for reporting channel state information

This application claims the priority of the Chinese patent application filed on January 16, 2015, the Chinese Patent Office, the application No. 201510024151.5, the invention titled "a method, user equipment and system for reporting channel state information", the entire contents of which are The citations are incorporated herein by reference.

Technical field

The present invention relates to the field of communications technologies, and in particular, to a method, user equipment, and system for reporting channel state information.

Background technique

Channel State Information (CSI) plays a vital role in modern communication systems. It can provide important information for resource scheduling, user transmission format determination, multi-user pairing and even multi-cell coordination. In the Long Term Evolution (LTE) system in the 3rd Generation Partnership Project (3GPP), the CSI usually includes a Channel Quality Indicator (CQI) and a precoding matrix. Information such as a Precoding Matrix Indicator (PMI) and a Rank Indicator (RI). For the downlink (that is, the network side device transmits data to the user equipment) system, the user equipment can calculate the CSI according to the reference signal sent by the network side device and feed back to the network side device. The network side device, that is, the network side device, may be a base station. The reference signal may include a CSI Reference Signal (CSI-RS) and a CSI Interference Measurement (CSI-IM).

In the LTE system of the 3GPP, the Coordinated Multiple Points Transmission (CoMP) technology can reduce the interference of the cell edge in the same-frequency networking of the LTE system, improve the spectrum efficiency of the cell edge, and enhance the coverage and Reduce the number of switchings. In the downlink CoMP system, a plurality of Transmission Nodes (TPs) cooperate to transmit a Physical Downlink Shared Channel (PDSCH) to the user equipment. The network side device can configure four CSI processes for one serving cell, and configure corresponding reference signals for each CSI process. In addition, the LTE system supports Carrier Aggregation (CA) technology from the SGPP R10 version protocol, that is, a plurality of carriers are aggregated and used as a wide frequency band.

If there are 2 carriers of CA, the serving cell corresponding to each carrier is configured with 4 CSI processes, and the user sets It is necessary to calculate 8 CSIs according to 8 CSI processes. When 8 CSI-RSs and 8 CSI-IMs have the same period in the corresponding CSI process, and the offset is also the same, then 8 CSI-RSs and 8 CSI- The IM may appear in the same subframe, that is, the CSI calculation of 8 CSI processes needs to be completed in the subframe. The number of CSI calculations increases with the number of configured CSI processes, and increases with the number of CA carriers. The computational complexity is high. Further, for chip implementation, the calculation of CSI itself is more complicated, and the increase of complexity will increase the area of the baseband chip, and the hardware cost is higher.

Summary of the invention

The present invention provides a method, user equipment and system for reporting channel state information, which can reduce the computational complexity of channel state information and reduce hardware costs.

A first aspect of the present invention provides a method for reporting channel state information, including:

And receiving, by the network side device, a plurality of reference signals respectively configured by the multiple CSI processes, where the multiple reference signals are in one-to-one correspondence with the multiple CSI processes, where each reference signal includes periodically sent CSI-RS and CSI -IM, and the subframe occupied by each reference signal during transmission is a target subframe, and the signal transmitted in any target subframe is at least one of the CSI-RS and the CSI-IM;

Determining, according to a preset time interval and a preset rule, a valid subframe from a target subframe respectively occupied by the plurality of reference signals, where between two adjacent valid subframes corresponding to any reference signal The time interval is not less than the preset time interval;

Calculating CSI corresponding to each of the multiple CSI processes according to the reference signals transmitted in the effective subframes of the plurality of reference signals respectively;

And feeding the corresponding CSIs of the multiple CSI processes to the network side device.

In a first possible implementation manner, the preset rule includes:

When the periods of the CSI-RS and the CSI-IM in the reference signal are the same and the offsets are the same, determining that the first target subframe corresponding to the reference signal is the first valid subframe, and in the reference signal Determining, in the target subframe after the n-1th valid subframe, a target subframe with a minimum time interval from the (n-1)th effective subframe and not less than the preset time interval Is the nth valid subframe; or

Obtaining a first period corresponding to the reference signal when a period of the CSI-RS and the CSI-IM in the reference signal is different, or a period of the CSI-RS and the CSI-IM in the reference signal is the same but the offset is different Transmitting a target subframe of the CSI-RS, and a target subframe of the first transmission CSI-IM corresponding to the reference signal;

Determining, if the target subframe of the first transmission CSI-RS is located before the target subframe of the first transmission CSI-IM, determining that the target subframe of the first transmission CSI-IM is the first valid subframe;

If the target subframe of the first transmission CSI-RS is located after the target subframe of the first transmission CSI-IM, determining that the target subframe of the first transmission CSI-RS is the first valid subframe;

Determining, in a target subframe after the n-1th valid subframe corresponding to the reference signal, a time interval between the n-1th valid subframe and a minimum time interval of not less than the preset time interval One target subframe is the nth valid subframe;

Where n is a positive integer greater than one.

With reference to the first aspect, or the first possible implementation manner of the first aspect, in the second possible implementation manner, the any reference signal corresponding to the target subframe belongs to the first CSI set and the second CSI set respectively;

The calculating the CSI corresponding to each of the multiple CSI processes according to the reference signals transmitted in the effective subframes of the plurality of reference signals respectively includes:

Determining whether the CSI calculated according to the reference signal transmitted by the previous valid subframe of the current valid subframe belongs to the first CSI set or the second CSI set, when the reference signal corresponds to the untransmitted CSI-IM in the currently valid subframe. And calculating, according to the reference signal transmitted in the currently valid subframe, a CSI of a CSI set different from a CSI set to which the previous CSI belongs;

Calculating CSI of the CSI set to which the current valid subframe belongs according to the reference signal transmitted in the currently valid subframe corresponding to the reference signal, when the CSI-IM is transmitted in the currently valid subframe. .

With reference to the first aspect, the first aspect of the first aspect, or the second possible implementation manner of the first aspect, in a third possible implementation manner, Before the reference signal transmitted in the calculation, corresponding to the CSI corresponding to each of the multiple CSI processes, the method further includes:

Determining whether the number of CSIs to be calculated is greater than a preset number threshold;

When the determination result is yes, determining, in the CSI Process corresponding to the multiple CSIs, a target CSI Process that meets the preset number threshold;

Calculating a corresponding CSI according to the reference signals transmitted in the valid subframes of the target CSI processes;

Calculating a corresponding CSI in a specified target subframe after the valid subframe according to a reference signal transmitted in a valid subframe in another CSI process corresponding to the multiple CSIs;

When the result of the determination is no, the CSI corresponding to the CSI is corresponding to the reference signal transmitted in the valid subframe, and the corresponding CSI is calculated.

With reference to the third possible implementation manner of the foregoing aspect, in a fourth possible implementation manner, the determining, in the CSI process corresponding to the multiple CSIs, the target CSI process that meets the preset quantity threshold includes:

Determining, according to a priority of a process number of a CSI process corresponding to each of the plurality of CSIs, a target CSI Process that satisfies the preset number threshold.

With reference to the third possible implementation manner of the foregoing aspect, in a fifth possible implementation manner, the determining, in the CSI process corresponding to the multiple CSIs, the target CSI process that meets the preset quantity threshold includes:

Determining a target that satisfies the preset number threshold according to a priority of a process number of a CSI process corresponding to each of the multiple CSIs, and a priority of a serving cell number of the serving cell corresponding to the CSI process having the same priority of the process number CSI Process.

With reference to any one of the third aspect of the first aspect to the fifth aspect of the first aspect, in a sixth possible implementation, the determining is performed in a CSI process corresponding to the multiple CSIs The target CSI Process that satisfies the preset number threshold includes:

When detecting that the CSI processes corresponding to the multiple CSIs include the CSI Process of the serving cell in the single-point transmission mode, determining that the CSI process of the serving cell of the single-point transmission mode has the highest priority.

With reference to the sixth possible implementation manner of the foregoing aspect, in a seventh possible implementation, any target subframe corresponding to a CSI process of the serving cell of the single-point transmission mode is a valid subframe, where The reference signal transmitted in a target subframe is a serving cell-specific reference signal of the single-point transmission mode.

With reference to any one of the third aspect of the first aspect to the seventh aspect of the first aspect, in an eighth possible implementation, the other one of the CSI processes corresponding to the multiple CSIs The CSI process respectively corresponds to the reference signal transmitted in the valid subframe, and before the corresponding target subframe after the valid subframe is calculated, the method further includes:

Determining that the number of CSIs to be calculated in the specified target subframe is not greater than the preset number threshold.

With reference to the first aspect, or any one of the first aspect of the first aspect to the eighth aspect, the ninth possible implementation manner, Calculating the CSI corresponding to each of the multiple CSI processes, respectively, corresponding to the reference signals transmitted in the valid subframes includes:

When the reference signal transmitted in the valid subframe corresponding to the reference signal includes a CSI-RS and a CSI-IM, calculating a corresponding CSI according to the CSI-RS and the CSI-IM transmitted in the valid subframe;

When the reference signal transmitted in the valid subframe corresponding to the reference signal includes a CSI-RS, calculating a corresponding CSI according to the CSI-RS transmitted in the valid subframe and the CSI-IM transmitted recently before the valid subframe. ;

When the reference signal transmitted in the valid subframe corresponding to the reference signal includes CSI-IM, calculate a corresponding CSI according to the CSI-IM transmitted in the valid subframe and the CSI-RS transmitted recently before the valid subframe. .

A second aspect of the present invention provides a user equipment, including:

a receiving unit, configured to receive multiple reference signals respectively configured by the network side device for multiple CSI processes, where the multiple reference signals are in one-to-one correspondence with the multiple CSI processes, where each reference signal includes a periodic transmission CSI-RS and CSI-IM, and each subframe referenced by the reference signal is a target subframe, and the signal transmitted in any target subframe is at least one of the CSI-RS and the CSI-IM ;

a determining unit, configured to determine, according to a preset time interval and a preset rule, a valid subframe from a target subframe occupied by each of the multiple reference signals, where two adjacent neighbors corresponding to any reference signal are valid The time interval between the subframes is not less than the preset time interval;

a calculating unit, configured to calculate a CSI corresponding to each of the multiple CSI processes according to a reference signal transmitted in each of the plurality of reference signals respectively corresponding to the effective subframe;

a feedback unit, configured to feed back the CSI corresponding to the multiple CSI processes to the network side device.

In a first possible implementation manner, the preset rule includes:

When the periods of the CSI-RS and the CSI-IM in the reference signal are the same and the offsets are the same, determining that the first target subframe corresponding to the reference signal is the first valid subframe, and in the reference signal Determining, in the target subframe after the n-1th valid subframe, a target subframe with a minimum time interval from the (n-1)th effective subframe and not less than the preset time interval Is the nth valid subframe; or

Obtaining a first period corresponding to the reference signal when a period of the CSI-RS and the CSI-IM in the reference signal is different, or a period of the CSI-RS and the CSI-IM in the reference signal is the same but the offset is different Transmitting a target subframe of the CSI-RS, and a target subframe of the first transmission CSI-IM corresponding to the reference signal;

If the target subframe of the first transmission CSI-RS is located before the target subframe of the first transmission CSI-IM, determining that the target subframe of the first transmission CSI-IM is the initial effective subframe;

If the target subframe of the first transmission CSI-RS is located after the target subframe of the first transmission CSI-IM, determining that the target subframe of the first transmission CSI-RS is the initial effective subframe;

Determining, in a target subframe after the n-1th valid subframe corresponding to the reference signal, a time interval between the n-1th valid subframe and a minimum time interval of not less than the preset time interval One target subframe is the nth valid subframe;

Where n is a positive integer greater than one.

With reference to the second aspect, or the first possible implementation manner of the second aspect, in the second possible implementation manner, the any reference signal corresponding to the target subframe belongs to the first CSI set and the second CSI set respectively;

The calculating unit is configured to: when the reference signal corresponds to a CSI-IM that is not transmitted in the current valid subframe, determine that the CSI calculated according to the reference signal transmitted by the previous valid subframe of the current valid subframe belongs to the first The CSI set is also the second CSI set, and calculates CSI of the CSI set different from the CSI set to which the previous CSI belongs according to the reference signal transmitted in the current valid subframe;

The calculating unit is further configured to: when the CSI-IM is transmitted in the currently valid subframe corresponding to the reference signal, calculate the current valid according to the reference signal transmitted in the currently valid subframe corresponding to the reference signal The CSI of the CSI set to which the subframe belongs.

With reference to the second aspect, the first aspect of the second aspect, or the second possible implementation manner of the second aspect, in a third possible implementation manner, the method further includes:

a determining unit, configured to determine, according to the reference signals transmitted in the valid subframes of the plurality of reference signals, respectively, before calculating the CSI corresponding to each of the multiple CSI processes, determining whether the number of CSIs to be calculated currently is Greater than a preset number threshold;

The determining unit is further configured to: when the determining unit determines that the result is YES, determine, in the CSI Process corresponding to the multiple CSIs, a target CSI Process that meets the preset number threshold;

The calculating unit is further configured to calculate a corresponding CSI according to the reference signal transmitted in the corresponding valid subframe of the target CSI process, and corresponding to the valid subframe according to the other CSI processes in the CSI process corresponding to the multiple CSIs a reference signal transmitted in the medium, and calculating a corresponding CSI in the specified target subframe after the valid subframe;

The calculating unit is further configured to: when the determining unit determines that the result is no, calculate a corresponding CSI according to the reference signals transmitted in the valid subframes corresponding to the CSI processes corresponding to the CSI.

With reference to the third possible implementation of the second aspect, in a fourth possible implementation, the determining unit is configured to determine, according to a priority of a process number of a CSI process corresponding to each of the multiple CSIs, The target CSI Process of the preset number threshold.

With reference to the third possible implementation of the second aspect, in a fifth possible implementation, the determining unit is configured to: according to a priority of a process number of a CSI process corresponding to each of the multiple CSIs, and a process The priority of the serving cell number of the serving cell corresponding to the CSI Process with the same priority is determined, and the content is determined to be satisfied. The target CSI Process of the preset number threshold.

With reference to any one of the third to the second aspect of the second aspect, in a sixth possible implementation, the determining unit is configured to detect the multiple CSIs When the corresponding CSI Process includes the CSI Process of the serving cell in the single-point transmission mode, the CSI Process of the serving cell that determines the single-point transmission mode has the highest priority.

With reference to the sixth possible implementation of the second aspect, in a seventh possible implementation, any target subframe corresponding to the CSI process of the serving cell in the single-point transmission mode is a valid subframe, where The reference signal transmitted in a target subframe is a serving cell-specific reference signal of the single-point transmission mode.

With reference to any one of the third aspect of the second aspect to the sixth aspect of the second aspect, in the eighth possible implementation, the determining unit is further used by the calculating unit according to the The other CSI processes respectively correspond to the reference signals transmitted in the valid subframes, and before the corresponding subframes after the valid subframes calculate the corresponding CSI, determine that the number of CSIs to be calculated in the specified target subframe is not greater than the The preset number threshold.

With reference to the second aspect, or any one of the first to the second aspect of the second aspect, in a ninth possible implementation, the calculating unit is configured to When the reference signal corresponding to the reference signal transmitted in the valid subframe includes the CSI-RS and the CSI-IM, the corresponding CSI is calculated according to the CSI-RS and the CSI-IM transmitted in the valid subframe;

The calculating unit is further configured to: when the reference signal transmitted in the valid subframe corresponding to the reference signal includes a CSI-RS, according to the CSI-RS transmitted in the valid subframe and the most recently transmitted before the valid subframe CSI-IM, calculating the corresponding CSI;

The calculating unit is further configured to: when the reference signal transmitted in the valid subframe corresponding to the reference signal includes a CSI-IM, according to the CSI-IM transmitted in the valid subframe and the most recently transmitted before the valid subframe CSI-RS, calculates the corresponding CSI.

A third aspect of the present invention provides a communication system, including a network side device and a user equipment, wherein the user equipment is as described in the second aspect or any one of the first to the ninth aspects of the second aspect, wherein :

The network side device is configured to send, to the user equipment, multiple reference signals respectively configured for multiple CSI processes, so that the user equipment calculates and feeds back the multiple CSI processes according to the multiple reference signals. Corresponding CSI.

In the embodiment of the present invention, the user equipment receives multiple reference signals respectively configured by the network side device for multiple CSI processes, and respectively uses target subframes respectively occupied by multiple reference signals according to preset time intervals and preset rules. Determining the effective subframes, respectively calculating the CSIs corresponding to the multiple CSI processes according to the reference signals transmitted in the valid subframes of the plurality of reference signals, respectively, and feeding the CSIs corresponding to the multiple CSI processes to the network side device, which can be reduced The computational complexity of channel state information and reduced hardware costs.

DRAWINGS

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the description of the prior art will be briefly described below. Obviously, the drawings in the following description are only It is a certain embodiment of the present invention, and other drawings can be obtained from those skilled in the art without any creative work.

1 is a schematic flowchart of a method for reporting channel state information according to a first embodiment of the present invention;

2 is a schematic structural diagram of a resource grid provided in a first embodiment of the present invention;

3 is a schematic flowchart of a method for reporting channel state information according to a second embodiment of the present invention;

4 is a schematic flowchart of a method for reporting channel state information according to a third embodiment of the present invention;

FIG. 5 is a schematic structural diagram of a resource grid provided in a second embodiment of the present invention; FIG.

FIG. 6 is a schematic structural diagram of a user equipment according to a first embodiment of the present invention; FIG.

FIG. 7 is a schematic structural diagram of a user equipment according to a second embodiment of the present invention; FIG.

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

detailed description

The technical solutions in the embodiments of the present invention are clearly and completely described in the following with reference to the accompanying drawings in the embodiments of the present invention. It is obvious that the described embodiments are only a part of the embodiments of the present invention, but not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative efforts are within the scope of the present invention.

It should be understood that the technical solutions of the embodiments of the present invention can be applied to various communication systems, such as a Global System of Mobile communication (GSM) system, a Code Division Multiple Access (CDMA) system, Wideband Code Division Multiple Access (WCDMA) system, General Packet Radio Service (GPRS), Long Term Evolution (LTE) system, LTE frequency division duplex (Frequency Division Duplex (FDD) system, LTE Time Division Duplex (TDD), Universal Mobile Telecommunication System (UMTS) or Worldwide Interoperability for Microwave Access (WiMAX) communication system.

It should be understood that, in the embodiment of the present invention, a user equipment (User Equipment, UE for short) may be referred to as a terminal, a mobile station (Mobile Station, or a mobile terminal), and the like. The radio access network (Radio Access Network, RAN for short) may communicate with one or more core networks, for example, the user equipment may be a mobile phone (or "cellular" phone) or a computer with a mobile terminal, etc., for example The user equipment can also be portable, pocket-sized, handheld, computer-integrated or in-vehicle mobile devices that exchange voice and/or data with the wireless access network.

In the embodiment of the present invention, the network side device may be a base station (Base Transceiver Station, BTS for short) in GSM or CDMA, or may be a base station (NodeB, referred to as NB) in WCDMA, or may be an evolved base station in LTE. (Evolutional Node B, eNB for short), the present invention is not limited, but for convenience of description, the following embodiments will be described by taking an eNB as an example.

3GPP introduces Coordinate Multi-Point Transmission (CoMP) in the LTE R11 protocol. The downlink CoMP system can reduce the interference of the cell edge in the LTE co-frequency networking, improve the spectrum efficiency of the cell edge, and enhance the coverage. Range and reduce the number of switchings, etc. In the downlink CoMP, multiple transmission nodes (TPs) cooperate to send a downlink shared channel (Physical Downlink Shared Channel, PDSCH) to the UE. In order to enable the network side device to select the best downlink coordinated transmission scheme, the UE needs to report The channel state information (CSI) of the multiple transmission schemes is defined by the channel state information process (CSI Process) for the LTE R11 protocol, and the CSI report of each transmission scheme corresponds to one CSI Process. The network side device can configure up to four CSI processes for one serving cell, that is, one user equipment can feed back CSI information of four transmission schemes.

In addition, the LTE system supports Carrier Aggregation (CA) from the R10 protocol, that is, a plurality of carriers are aggregated and used as a wide frequency band. For example, in the case of CA, if each serving cell requires COMP support, since each serving cell can be configured with a maximum of four CSI processes, and two serving cells perform CA, there may be a maximum of eight CSI Processes, that is, one user. The device can feed back up to CSI information of 8 transmission schemes.

For ease of understanding, take the LTE system as an example to introduce the frame structure. In the LTE system, uplink and downlink transmissions are organized into radio frames, each radio frame is 10 milliseconds long, and each radio frame includes 10 1 millisecond long. Subframe, subframe number from 0 to 9. The network side device respectively configures multiple reference signals for multiple CSI processes, and the multiple reference signals correspond to multiple CSI processes, and the reference signals may include a CSI Reference Signal (CSI-RS) and a channel. CSI Interference Measurement (CSI-IM). The period of CSI-RS and CSI-IM in one reference signal may be 5ms, 10ms, 20ms, 40ms or 80ms, and the offsets of CSI-RS and CSI-IM may be the same or different, where the offset of CSI-RS It refers to the time interval between the target subframe of the first transmission CSI-RS and the subframe 0. The offset of the CSI-IM refers to: between the target subframe of the first transmission CSI-IM and the subframe 0. Interval. The user equipment may obtain the channel estimation result H according to the CSI-RS transmitted in the target subframe corresponding to each of the plurality of reference signals, and acquire the interference information P according to the CSI-IM transmitted in the target subframe corresponding to each of the plurality of reference signals, and according to H and P, calculate the CSI corresponding to each of the multiple CSI processes.

Referring to FIG. 1 , FIG. 1 is a schematic flowchart of a method for reporting channel state information according to a first embodiment of the present invention. The method for reporting channel state information in the embodiment of the present invention may include at least:

S101. Receive multiple reference signals respectively configured by the network side device for multiple channel state information processes.

The user equipment can receive multiple reference signals respectively configured by the network side device for multiple CSI processes. The plurality of reference signals are in one-to-one correspondence with the plurality of CSI processes, and each of the reference signals may include a CSI-RS and a CSI-IM that are periodically transmitted, and each of the subframes occupied by the reference signal is a target subframe. The signal transmitted in a target subframe is at least one of a CSI-RS and a CSI-IM.

Specifically, the network side device may configure multiple CSI processes for one serving cell, and then configure a reference signal for each CSI Process. For example, the network side device may determine the subframe occupied by the reference signal transmission according to the reference signal configuration information corresponding to each of the preset multiple CSI processes, and periodically send the reference signal through the foregoing subframe, and the user in the serving cell The device can receive multiple reference signals configured by the network side device for multiple CSI processes. After receiving the reference signals corresponding to the multiple CSI processes, the user equipment may determine, according to the reference signal configuration information corresponding to the multiple CSI processes, the subframe occupied by the reference signal during the transmission as the target subframe. The reference signal configuration information may include a period of the reference signal and an offset, or a subframe occupied by the reference signal when transmitting. The reference signal configuration information corresponding to the CSI process in the user equipment and the reference signal configuration information corresponding to the CSI process in the network side device are pre-negotiated, that is, the reference signal configuration information corresponding to the CSI Process in the user equipment and the CSI in the network side device The reference signal configuration information corresponding to the Process is the same.

Taking the structure diagram of the resource cell shown in FIG. 2 as an example, when the CSI Process corresponds to the reference signal configuration information When the configuration is 0, the CSI-RS and CSI-IM are both 5 ms and the offset is 1 ms. That is, the network-side device sends CSI-RS and CSI-IM every 5 ms. The network-side device is separated from the subframe 0. The target subframe of 1 ms transmits the CSI-RS and the CSI-IM, and the target subframe that is separated from the subframe 0 by 1 ms is also the subframe 1. The user equipment can determine the subframes 1 and 6 according to the period and the offset of the reference signal. The CSI-RS and the CSI-IM are transmitted by the 11th and the 16th, and the user equipment can set the above subframe as the target subframe. Optionally, the reference signal configuration information corresponding to the CSI process may indicate that the subframe occupied by the reference signal is the subframes 1, 6, 11, and 16, and the user equipment may set the subframe as the target subframe.

When the reference signal configuration information corresponding to the CSI process is configuration 1, the CSI-RS and CSI-IM periods are both 5 ms, the CSI-RS offset is 2 ms, and the CSI-IM offset is 4 ms, the user equipment can determine The reference signals are transmitted through subframes 2, 4, 7, 9, 12, 14, 17, and 19, and the user equipment can set the above subframes as target subframes. Optionally, the reference signal configuration information corresponding to the CSI process may indicate that the subframe occupied by the reference signal is subframes 2, 4, 7, 9, 12, 14, 17, and 19, and the user equipment may set the subframe as the subframe. Target subframe.

When the reference signal configuration information corresponding to the CSI Process is configuration 2, the CSI-RS period is 5 ms, the CSI-IM period is 10 ms, the CSI-RS offset is 2 ms, and the CSI-IM offset is 0 ms. The device may determine that the reference signal is transmitted through subframes 0, 2, 7, 10, 12, and 17, and the user equipment may set the subframe as the target subframe. Optionally, the reference signal configuration information corresponding to the CSI process may indicate that the subframe occupied by the reference signal is subframes 0, 2, 7, 10, 12, and 17, and the user equipment may set the subframe as the target subframe.

S102. Determine, according to a preset time interval and a preset rule, valid subframes from target subframes occupied by each of the multiple reference signals.

The user equipment may determine valid subframes from the target subframes occupied by the plurality of reference signals respectively according to the preset time interval, where the time interval between two adjacent valid subframes corresponding to any reference signal is not Less than the preset time interval.

Preferably, the preset time interval may be 5 ms. The preset time interval is the optimal value after the reliability and complexity of the CSI are weighed. The periods of CSI-RS and CSI-IM can be 5ms, 10ms, 20ms, 40ms, and 80ms, and the shortest period of CSI-RS and CSI-IM is 5ms. When the preset time interval is less than 5 ms, the reference signal transmitted in the effective subframe includes the reference signal of each period, and the reliability of the CSI is high, but the calculated CSI is still relatively large, and the computational complexity of the CSI cannot be effectively solved. When the preset time interval is greater than 5 ms, the calculated CSI is significantly reduced, but the reference signal transmitted in the effective subframe may only include the reference signal of the partial period, and the reliability of the CSI is low, the preset time interval is 5 ms. Is the balance of reliability and complexity of CSI best value. It should be noted that the preset time interval in the embodiment of the present invention includes, but is not limited to, 5 ms. For example, in a future communication system, the shortest period of the CSI-RS and the CSI-IM is 10 ms, and the user equipment needs to weigh the CSI. Reliability and complexity to determine the time interval.

In an alternative embodiment, the preset rule may be:

(1) When the periods of the CSI-RS and the CSI-IM in the reference signal are the same and the offsets are the same, the user equipment may determine that the first target subframe corresponding to the reference signal is the first valid subframe, and is in the reference signal. In the target subframe after the corresponding n-1th effective subframe, determining that the target subframe with the smallest interval between the n-1th effective subframe and the preset time interval is the nth Valid subframe. The offset between the CSI-RS and the CSI-IM is the same, that is, the time interval between the target subframe of the first transmission CSI-RS and the subframe 0, and between the target subframe and the subframe 0 of the first transmission CSI-IM. The time interval is the same. Where n is a positive integer greater than one.

Taking the structure diagram of the resource cell shown in Figure 2 as an example, when the reference signal configuration information corresponding to the CSI Process is configuration 0, the CSI-RS and CSI-IM cycles are both 5 ms, and the CSI-RS and CSI-IM are biased. If the shift is 1 ms, the user equipment may determine that the CSI-RS and the CSI-IM have the same period in the reference signal corresponding to the CSI process, and the offsets of the CSI-RS and the CSI-IM in the reference signal are the same, that is, the subframe 1, CSI-RS and CSI-IM are transmitted in 6, 11, and 16, and subframes 1, 6, 11, and 16 are target subframes. The user equipment may determine that the subframe 1 is the first valid subframe, where the preset time interval is 5 ms, and the user equipment may determine the first valid subframe in the target subframe after the first valid subframe. The target subframes whose time interval is not less than the preset time interval are subframes 6, 11, and 16, and the subframes with the shortest time interval between the first valid subframe and the first valid subframe are determined in subframes 6, 11, and 16. The subframe is subframe 6, that is, subframe 6 is the second valid subframe. Similarly, the user equipment may determine, in the target subframe after the second valid subframe, that the target subframe with the time interval between the second valid subframe and the second valid subframe is not less than the preset time interval, and is the subframes 11 and 16 Further, in the subframes 11 and 16, it is determined that the target subframe having the shortest time interval from the second valid subframe is the subframe 11, that is, the subframe 11 is the third effective subframe. Similarly, the user equipment may determine, in the target subframe after the third valid subframe, that the target subframe with the time interval of the third valid subframe is not less than the preset time interval is the subframe 16, The user equipment can determine that subframe 16 is the fourth valid subframe. That is to say, the valid subframes are subframes 1, 6, 11, and 16, wherein the reference signal transmitted in the valid subframe can be referred to the gray portion corresponding to configuration 0 in FIG.

(2) When the periods of the CSI-RS and the CSI-IM in the reference signal are different, or when the periods of the CSI-RS and the CSI-IM in the reference signal are the same but the offsets are different, the first transmission CSI corresponding to the reference signal is acquired. The target subframe of the RS, and the target subframe of the first transmission CSI-IM corresponding to the reference signal.

If the target subframe of the first transmission CSI-RS is located before the target subframe of the first transmission CSI-IM, it is determined that the target subframe of the first transmission CSI-IM is the first valid subframe.

In the target subframe after the n-1th valid subframe corresponding to the reference signal, determining a target subframe with a minimum time interval from the (n-1)th effective subframe and not less than a preset time interval is The nth valid subframe. Where n is a positive integer greater than one.

Taking the structure diagram of the resource cell shown in FIG. 2 as an example, when the reference signal configuration information corresponding to the CSI Process is configuration 1, the CSI-RS and CSI-IM cycles are both 5 ms, and the CSI-RS offset is 2 ms. The offset of the CSI-IM is 4 ms, and the user equipment can determine that the target subframe is subframes 2, 4, 7, 9, 12, 14, 17, and 19. The user equipment may determine that the CSI-RS and the CSI-IM have the same period but different offsets in the reference signal corresponding to the CSI process, where the target subframe in which the CSI-RS is transmitted in the first is the subframe 2, and the first one transmits the CSI- The target subframe of the IM is subframe 4. The CSI-RS is transmitted in the subframe 2, and the reference signal is not transmitted in the subframe before the subframe 2. The user equipment can only obtain the channel estimation result H according to the CSI-RS transmitted in the subframe 2, and the interference information P cannot be obtained. It is impossible to calculate the CSI. The user equipment may obtain the channel estimation result H according to the CSI-RS transmitted in the subframe 2, and may acquire the interference information P according to the CSI-IM transmitted in the subframe 4, and further calculate the CSI according to the channel estimation result H and the interference information P, The user equipment can determine that subframe 4 is the first valid subframe.

The preset time interval may be 5 ms, and the user equipment may determine, in the target subframe after the first valid subframe, that the time interval between the first valid subframe and the first valid subframe is not less than a preset time interval. The subframes are subframes 9, 12, 14, 17, and 19. Further, in the subframe, the target subframe with the shortest time interval from the first valid subframe is determined to be the subframe 9, that is, the subframe 9 is the first subframe. 2 valid subframes. Similarly, the user equipment may determine, in the target subframe after the second valid subframe, that the target subframe with the time interval between the second valid subframe and the second valid subframe is not less than the preset time interval, and is the subframe 14, 17 And 19, and further determining, in the subframes 14, 17 and 19, that the target subframe having the shortest time interval from the second valid subframe is the subframe 14, that is, the subframe 14 is the third effective subframe. Similarly, the user equipment may determine, in the target subframe after the third valid subframe, that the target subframe with the time interval of the third valid subframe is not less than the preset time interval is the subframe 19, The user equipment can determine that subframe 19 is the fourth valid subframe. That is to say, the valid subframes are subframes 4, 9, 14, and 19, and the reference signals transmitted in the effective subframe can be referred to the gray portion corresponding to configuration 1 in FIG.

(3) When the periods of the CSI-RS and the CSI-IM in the reference signal are different, or when the periods of the CSI-RS and the CSI-IM in the reference signal are the same but the offsets are different, the first transmission CSI corresponding to the reference signal is acquired. a target subframe of the RS, and a target subframe of the first transmission CSI-IM corresponding to the reference signal;

If the target subframe of the first transmission CSI-RS is located after the target subframe of the first transmission CSI-IM, determine that the target subframe of the first transmission CSI-RS is the first valid subframe;

In the target subframe after the n-1th valid subframe corresponding to the reference signal, determining a target subframe with a minimum time interval from the (n-1)th effective subframe and not less than a preset time interval is The nth valid subframe;

Where n is a positive integer greater than one.

Taking the structure diagram of the resource cell shown in FIG. 2 as an example, when the reference signal configuration information corresponding to the CSI Process is configuration 2, the CSI-RS period is 5 ms, the CSI-IM period is 10 ms, and the CSI-RS offset is 2 ms, the offset of the CSI-IM is 0 ms, the user equipment can determine that the target subframe is subframes 0, 2, 7, 10, 12, and 17, and the user equipment can determine the CSI-RS and the reference signal corresponding to the CSI Process. The cycle and offset of the CSI-IM are different. The target subframe in which the first CSI-RS is transmitted is the subframe 2, the target subframe in which the CSI-IM is transmitted in the first frame is the subframe 0, and the CSI-IM is transmitted in the subframe 0, and the user equipment is based on the subframe 0. The CSI-IM transmitted in the middle can only obtain the interference information P, and cannot obtain the channel estimation result H, and thus cannot calculate the CSI. The user equipment can obtain the interference information P according to the CSI-IM transmitted in the subframe 0, and the channel estimation result H can be obtained according to the CSI-RS transmitted in the subframe 2, and the user equipment can determine that the subframe 2 is the first valid subframe. .

The preset time interval may be 5 ms, and the user equipment may determine, in the target subframe after the first valid subframe, that the time interval between the first valid subframe and the first valid subframe is not less than a preset time interval. The frame is subframes 7, 10, 12, and 17, and further, in the subframe, the target subframe with the shortest time interval from the first valid subframe is determined to be subframe 7, that is, subframe 7 is the second effective. Subframe. Similarly, the user equipment may determine, in the target subframe after the second valid subframe, that the target subframe with the time interval between the second valid subframe and the second valid subframe is not less than the preset time interval, and is the subframes 12 and 17 Further, in the subframe, it is determined that the target subframe having the shortest time interval from the second valid subframe is the subframe 12, that is, the subframe 12 is the third effective subframe. Similarly, the user equipment may determine, in the target subframe after the third effective subframe, that the target subframe with the time interval of the third valid subframe is not less than the preset time interval is the subframe 17, The user equipment can determine that subframe 17 is the fourth valid subframe. That is to say, the valid subframes are subframes 2, 7, 12, and 17, wherein the reference signals transmitted in the effective subframe can be referred to the gray portion corresponding to configuration 2 in FIG.

S103. Calculate channel state information corresponding to each of the multiple channel state information processes according to the reference signals transmitted in the effective subframes of the plurality of reference signals respectively.

The user equipment may calculate the CSI corresponding to each of the multiple CSI processes according to the reference signals transmitted in the valid subframes of the plurality of reference signals.

In an optional embodiment, when the reference signal transmitted in the reference signal corresponding to the valid subframe includes the CSI-RS and the CSI-IM, the corresponding CSI is calculated according to the CSI-RS and the CSI-IM transmitted in the valid subframe. For example, when the reference signal configuration information corresponding to the CSI process is configuration 0, the user equipment may separately obtain the channel estimation result H and the interference information P according to the CSI-RS and the CSI-IM transmitted in the subframe 1, and according to the channel estimation result. H and the interference information P calculate the CSI corresponding to the CSI Process.

In an optional embodiment, when the reference signal transmitted in the reference signal corresponding to the valid signal includes the CSI-RS, the corresponding CSI-RS transmitted in the valid subframe and the CSI-IM transmitted before the valid subframe are calculated. CSI. For example, when the reference signal configuration information corresponding to the CSI process is configuration 2, the user equipment may obtain the channel estimation result H according to the CSI-RS transmitted in the subframe 2, according to the target subframe in which the CSI-IM is transmitted recently before the subframe 2. The transmitted CSI-IM, that is, the CSI-IM transmitted in the subframe 0 acquires the interference information P, and calculates the CSI corresponding to the CSI Process according to the channel estimation result H and the interference information P. For another example, the user equipment may obtain the channel estimation result H according to the CSI-RS transmitted in the subframe 7, according to the CSI-IM transmitted in the target subframe of the CSI-IM recently transmitted before the subframe 7, that is, the transmission in the subframe 0. The CSI-IM acquires the interference information P, and calculates the CSI corresponding to the CSI Process according to the channel estimation result H and the interference information P. For another example, the user equipment may obtain the channel estimation result H according to the CSI-RS transmitted in the subframe 12, according to the CSI-IM transmitted in the target subframe of the CSI-IM recently transmitted before the subframe 12, that is, the transmission in the subframe 10. The CSI-IM acquires the interference information P, and calculates the CSI corresponding to the CSI Process according to the channel estimation result H and the interference information P.

In an optional embodiment, when the reference signal transmitted in the reference subframe corresponding to the valid signal includes the CSI-IM, the corresponding CSI-IM transmitted in the valid subframe and the CSI-RS transmitted before the valid subframe are calculated. CSI. For example, when the reference signal configuration information corresponding to the CSI Process is configuration 1, the user equipment may acquire the interference information P according to the CSI-IM transmitted in the subframe 4, and transmit according to the target subframe in which the CSI-RS is transmitted recently before the subframe 4. The CSI-RS, that is, the CSI-RS transmitted in the subframe 2 acquires the channel estimation result H, and calculates the CSI corresponding to the CSI Process based on the channel estimation result H and the interference information P. For another example, the user equipment may acquire the interference information P according to the CSI-IM transmitted in the subframe 9, according to the CSI-RS transmitted in the target subframe of the CSI-RS recently transmitted before the subframe 9, that is, the CSI transmitted in the subframe 7. The RS acquires the channel estimation result H, and calculates the CSI corresponding to the CSI Process based on the channel estimation result H and the interference information P.

S104. Feed channel state information corresponding to each of the multiple channel state information processes to the network side device.

The user equipment can feed back the CSI corresponding to the multiple CSI processes to the network side device. For example, after the user equipment can calculate the CSI corresponding to the CSI process, the CSI is sent to the network side device. Optional, user equipment After calculating a plurality of CSIs corresponding to the CSI process, the calculated plurality of CSIs are filtered to obtain an average value, and the average value is sent to the network side device.

In the method for reporting the channel state information, the target subframe in which the reference signal is transmitted needs to calculate the CSI, and the computational complexity is high. In the embodiment of the present invention, only the effective subframe needs to calculate the CSI. For example, when the reference signal configuration information corresponding to the target CSI process is configuration 1, the target subframe is subframes 2, 4, 7, 9, 12, 14, 17, and 19, and the effective subframes are subframes 4, 9, and 19, that is, the method for reporting the channel state information needs to calculate the CSI 8 times, and the embodiment of the present invention can calculate only 4 CSIs without affecting the CSI reliability, and the CSI calculation density is doubled. Can effectively reduce the computational complexity of CSI.

In the method for reporting the channel state information shown in FIG. 1, the plurality of reference signals respectively configured by the network side device for the multiple CSI processes are respectively occupied by the plurality of reference signals according to the preset time interval and the preset rule. Determining the effective subframes in the target subframes, respectively calculating the CSIs corresponding to the multiple CSI processes according to the reference signals transmitted in the effective subframes of the plurality of reference signals, and feeding the CSIs corresponding to the multiple CSI processes to the network side Devices reduce the computational complexity of channel state information and reduce hardware costs.

Referring to FIG. 3, FIG. 3 is a schematic flowchart of a method for reporting channel state information according to a second embodiment of the present invention. The method for reporting channel state information in the embodiment of the present invention may include at least:

S301. Receive multiple reference signals respectively configured by the network side device for multiple channel state information processes.

The user equipment can receive multiple reference signals respectively configured by the network side device for multiple CSI processes. The plurality of reference signals are in one-to-one correspondence with the plurality of CSI processes, and each of the reference signals may include a CSI-RS and a CSI-IM that are periodically transmitted, and each of the subframes occupied by the reference signal is a target subframe. The signal transmitted in a target subframe is at least one of a CSI-RS and a CSI-IM.

Specifically, the network side device may configure multiple CSI processes for one serving cell, and then configure a reference signal for each CSI Process. For example, the network side device may determine the subframe occupied by the reference signal transmission according to the reference signal configuration information corresponding to each of the preset multiple CSI processes, and periodically send the reference signal through the foregoing subframe, and the user in the serving cell The device can receive multiple reference signals configured by the network side device for multiple CSI processes. After receiving the reference signals corresponding to the multiple CSI processes, the user equipment may determine, according to the reference signal configuration information corresponding to the multiple CSI processes, the subframe occupied by the reference signal during the transmission as the target subframe. The reference signal configuration information may include a period of the reference signal and an offset, or a subframe occupied by the reference signal when transmitting. Reference signal configuration information corresponding to the CSI Process in the user equipment and the network side device The reference signal configuration information corresponding to the CSI process is pre-negotiated, that is, the reference signal configuration information corresponding to the CSI Process in the user equipment is the same as the reference signal configuration information corresponding to the CSI Process in the network side device.

Taking the structure diagram of the resource cell shown in FIG. 2 as an example, when the reference signal configuration information corresponding to the CSI process is configuration 0, the CSI-RS and CSI-IM cycles are both 5 ms, and the offset is 1 ms, that is, the network side. The device sends the CSI-RS and the CSI-IM every 5 ms. The network-side device transmits the CSI-RS and the CSI-IM through the target subframe that is separated by 1 ms from the subframe 0. The target subframe that is separated from the subframe 0 by 1 ms is also the sub-frame. Frame 1, the user equipment can determine that the CSI-RS and the CSI-IM are transmitted through the subframes 1, 6, 11, and 16 according to the period and the offset of the reference signal, and the user equipment can set the subframe as the target sub-frame. frame. Optionally, the reference signal configuration information corresponding to the CSI process may indicate that the subframe occupied by the reference signal is the subframes 1, 6, 11, and 16, and the user equipment may set the subframe as the target subframe.

When the reference signal configuration information corresponding to the CSI process is configuration 1, the CSI-RS and CSI-IM periods are both 5 ms, the CSI-RS offset is 2 ms, and the CSI-IM offset is 4 ms, the user equipment can determine The reference signals are transmitted through subframes 2, 4, 7, 9, 12, 14, 17, and 19, and the user equipment can set the above subframes as target subframes. Optionally, the reference signal configuration information corresponding to the CSI process may indicate that the subframe occupied by the reference signal is subframes 2, 4, 7, 9, 12, 14, 17, and 19, and the user equipment may set the subframe as the subframe. Target subframe.

When the reference signal configuration information corresponding to the CSI Process is configuration 2, the CSI-RS period is 5 ms, the CSI-IM period is 10 ms, the CSI-RS offset is 2 ms, and the CSI-IM offset is 0 ms. The device may determine that the reference signal is transmitted through subframes 0, 2, 7, 10, 12, and 17, and the user equipment may set the subframe as the target subframe. Optionally, the reference signal configuration information corresponding to the CSI process may indicate that the subframe occupied by the reference signal is subframes 0, 2, 7, 10, 12, and 17, and the user equipment may set the subframe as the target subframe.

S302. Determine, according to a preset time interval and a preset rule, a valid subframe from a target subframe that is occupied by each of the multiple reference signals.

The user equipment may determine valid subframes from the target subframes occupied by the plurality of reference signals respectively according to the preset time interval, where the time interval between two adjacent valid subframes corresponding to any reference signal is not Less than the preset time interval.

Preferably, the preset time interval may be 5 ms. The preset time interval is the optimal value after the reliability and complexity of the CSI are weighed. The periods of CSI-RS and CSI-IM can be 5ms, 10ms, 20ms, 40ms, and 80ms, and the shortest period of CSI-RS and CSI-IM is 5ms. When the preset time interval is less than 5 ms, the reference signal transmitted in the effective subframe includes reference signals of each period, and the reliability of the CSI is high, but needs to be calculated. There are still many CSIs that cannot effectively solve the computational complexity of CSI. When the preset time interval is greater than 5 ms, the calculated CSI is significantly reduced, but the reference signal transmitted in the effective subframe may only include the reference signal of the partial period, and the reliability of the CSI is low, the preset time interval is 5 ms. It is the best value after the balance of reliability and complexity of CSI. It should be noted that the preset time interval in the embodiment of the present invention includes, but is not limited to, 5 ms. For example, in a future communication system, the shortest period of the CSI-RS and the CSI-IM is 10 ms, and the user equipment needs to weigh the CSI. Reliability and complexity to determine the time interval.

In an alternative embodiment, the preset rule may be:

(1) When the periods of the CSI-RS and the CSI-IM in the reference signal are the same and the offsets are the same, the user equipment may determine that the first target subframe corresponding to the reference signal is the first valid subframe, and is in the reference signal. In the target subframe after the corresponding n-1th effective subframe, determining that the target subframe with the smallest interval between the n-1th effective subframe and the preset time interval is the nth Valid subframe. The offset between the CSI-RS and the CSI-IM is the same, that is, the time interval between the target subframe of the first transmission CSI-RS and the subframe 0, and between the target subframe and the subframe 0 of the first transmission CSI-IM. The time interval is the same. Where n is a positive integer greater than one.

Taking the structure diagram of the resource cell shown in Figure 2 as an example, when the reference signal configuration information corresponding to the CSI Process is configuration 0, the CSI-RS and CSI-IM cycles are both 5 ms, and the CSI-RS and CSI-IM are biased. If the shift is 1 ms, the user equipment may determine that the CSI-RS and the CSI-IM have the same period in the reference signal corresponding to the CSI process, and the offsets of the CSI-RS and the CSI-IM in the reference signal are the same, that is, the subframe 1, CSI-RS and CSI-IM are transmitted in 6, 11, and 16, and subframes 1, 6, 11, and 16 are target subframes. The user equipment may determine that the subframe 1 is the first valid subframe, where the preset time interval is 5 ms, and the user equipment may determine the first valid subframe in the target subframe after the first valid subframe. The target subframes whose time interval is not less than the preset time interval are subframes 6, 11, and 16, and the subframes with the shortest time interval between the first valid subframe and the first valid subframe are determined in subframes 6, 11, and 16. The subframe is subframe 6, that is, subframe 6 is the second valid subframe. Similarly, the user equipment may determine, in the target subframe after the second valid subframe, that the target subframe with the time interval between the second valid subframe and the second valid subframe is not less than the preset time interval, and is the subframes 11 and 16 Further, in the subframes 11 and 16, it is determined that the target subframe having the shortest time interval from the second valid subframe is the subframe 11, that is, the subframe 11 is the third effective subframe. Similarly, the user equipment may determine, in the target subframe after the third valid subframe, that the target subframe with the time interval of the third valid subframe is not less than the preset time interval is the subframe 16, The user equipment can determine that subframe 16 is the fourth valid subframe. That is to say, the valid subframes are subframes 1, 6, 11, and 16, wherein the reference signal transmitted in the valid subframe can be referred to the gray portion corresponding to configuration 0 in FIG.

(2) When the periods of the CSI-RS and the CSI-IM in the reference signal are different, or when the periods of the CSI-RS and the CSI-IM in the reference signal are the same but the offsets are different, the first transmission CSI corresponding to the reference signal is acquired. The target subframe of the RS, and the target subframe of the first transmission CSI-IM corresponding to the reference signal.

If the target subframe of the first transmission CSI-RS is located before the target subframe of the first transmission CSI-IM, it is determined that the target subframe of the first transmission CSI-IM is the first valid subframe.

In the target subframe after the n-1th valid subframe corresponding to the reference signal, determining a target subframe with a minimum time interval from the (n-1)th effective subframe and not less than a preset time interval is The nth valid subframe. Where n is a positive integer greater than one.

Taking the structure diagram of the resource cell shown in FIG. 2 as an example, when the reference signal configuration information corresponding to the CSI Process is configuration 1, the CSI-RS and CSI-IM cycles are both 5 ms, and the CSI-RS offset is 2 ms. The offset of the CSI-IM is 4 ms, and the user equipment can determine that the target subframe is subframes 2, 4, 7, 9, 12, 14, 17, and 19. The user equipment may determine that the CSI-RS and the CSI-IM have the same period but different offsets in the reference signal corresponding to the CSI process, where the target subframe in which the CSI-RS is transmitted in the first is the subframe 2, and the first one transmits the CSI- The target subframe of the IM is subframe 4. The CSI-RS is transmitted in the subframe 2, and the reference signal is not transmitted in the subframe before the subframe 2. The user equipment can only obtain the channel estimation result H according to the CSI-RS transmitted in the subframe 2, and the interference information P cannot be obtained. It is impossible to calculate the CSI. The user equipment may obtain the channel estimation result H according to the CSI-RS transmitted in the subframe 2, and may acquire the interference information P according to the CSI-IM transmitted in the subframe 4, and further calculate the CSI according to the channel estimation result H and the interference information P, The user equipment can determine that subframe 4 is the first valid subframe.

The preset time interval may be 5 ms, and the user equipment may determine, in the target subframe after the first valid subframe, that the time interval between the first valid subframe and the first valid subframe is not less than a preset time interval. The subframes are subframes 9, 12, 14, 17, and 19. Further, in the subframe, the target subframe with the shortest time interval from the first valid subframe is determined to be the subframe 9, that is, the subframe 9 is the first subframe. 2 valid subframes. Similarly, the user equipment may determine, in the target subframe after the second valid subframe, that the target subframe with the time interval between the second valid subframe and the second valid subframe is not less than the preset time interval, and is the subframe 14, 17 And 19, and further determining, in the subframes 14, 17 and 19, that the target subframe having the shortest time interval from the second valid subframe is the subframe 14, that is, the subframe 14 is the third effective subframe. Similarly, the user equipment may determine, in the target subframe after the third valid subframe, that the target subframe with the time interval of the third valid subframe is not less than the preset time interval is the subframe 19, The user equipment can determine that subframe 19 is the fourth valid subframe. That is to say, the valid subframes are subframes 4, 9, 14, and 19, and the reference signals transmitted in the effective subframe can be referred to the gray portion corresponding to configuration 1 in FIG.

(3) When the periods of the CSI-RS and the CSI-IM in the reference signal are different, or when the periods of the CSI-RS and the CSI-IM in the reference signal are the same but the offsets are different, the first transmission CSI corresponding to the reference signal is acquired. a target subframe of the RS, and a target subframe of the first transmission CSI-IM corresponding to the reference signal;

If the target subframe of the first transmission CSI-RS is located after the target subframe of the first transmission CSI-IM, determine that the target subframe of the first transmission CSI-RS is the first valid subframe;

In the target subframe after the n-1th valid subframe corresponding to the reference signal, determining a target subframe with a minimum time interval from the (n-1)th effective subframe and not less than a preset time interval is The nth valid subframe;

Where n is a positive integer greater than one.

Taking the structure diagram of the resource cell shown in FIG. 2 as an example, when the reference signal configuration information corresponding to the CSI Process is configuration 2, the CSI-RS period is 5 ms, the CSI-IM period is 10 ms, and the CSI-RS offset is 2 ms, the offset of the CSI-IM is 0 ms, the user equipment can determine that the target subframe is subframes 0, 2, 7, 10, 12, and 17, and the user equipment can determine the CSI-RS and the reference signal corresponding to the CSI Process. The cycle and offset of the CSI-IM are different. The target subframe in which the first CSI-RS is transmitted is the subframe 2, the target subframe in which the CSI-IM is transmitted in the first frame is the subframe 0, and the CSI-IM is transmitted in the subframe 0, and the user equipment is based on the subframe 0. The CSI-IM transmitted in the middle can only obtain the interference information P, and cannot obtain the channel estimation result H, and thus cannot calculate the CSI. The user equipment can obtain the interference information P according to the CSI-IM transmitted in the subframe 0, and the channel estimation result H can be obtained according to the CSI-RS transmitted in the subframe 2, and the user equipment can determine that the subframe 2 is the first valid subframe. .

The preset time interval may be 5 ms, and the user equipment may determine, in the target subframe after the first valid subframe, that the time interval between the first valid subframe and the first valid subframe is not less than a preset time interval. The frame is subframes 7, 10, 12, and 17, and further, in the subframe, the target subframe with the shortest time interval from the first valid subframe is determined to be subframe 7, that is, subframe 7 is the second effective. Subframe. Similarly, the user equipment may determine, in the target subframe after the second valid subframe, that the target subframe with the time interval between the second valid subframe and the second valid subframe is not less than the preset time interval, and is the subframes 12 and 17 Further, in the subframe, it is determined that the target subframe having the shortest time interval from the second valid subframe is the subframe 12, that is, the subframe 12 is the third effective subframe. Similarly, the user equipment may determine, in the target subframe after the third effective subframe, that the target subframe with the time interval of the third valid subframe is not less than the preset time interval is the subframe 17, The user equipment can determine that subframe 17 is the fourth valid subframe. That is to say, the valid subframes are subframes 2, 7, 12, and 17, wherein the reference signals transmitted in the effective subframe can be referred to the gray portion corresponding to configuration 2 in FIG.

S303. Determine a channel shape calculated according to a reference signal transmitted by a previous valid subframe of the current valid subframe. Whether the state information belongs to the first channel state information set or the second channel state information set.

In a Heterogeneous Network (HetNet) scenario, the network side device may include a macro station and a micro station, wherein the macro station transmits power and the micro station transmits power is small, causing the reference signal transmitted in the partial subframe to be received. The interference of the reference signal transmitted in some sub-frames is relatively small, and the interference information P obtained according to the CSI-IM is affected, and the accuracy of the calculated channel quality indicator (CQI) is calculated. Lower. In order to solve the above technical problem, the network side device may allocate any reference signal corresponding target subframes to belong to the first CSI set and the second CSI set respectively, where different CSI sets have different interferences. For example, subframes 0 to 9 are subject to large interference, and CSI sets to which subframes 0 to 9 belong are the first CSI set, subframes 10 to 19 are less interfered, and subframes 10 to 19 belong to the CSI set. Two CSI collections.

Among them, heterogeneous networks are composed of computers, network devices and systems produced by different manufacturers, and in most cases run on different protocols to support different functions or applications. Heterogeneous means that two or more wireless communication systems use different access technologies, or use the same wireless access technology but belong to different wireless carriers. Heterogeneous networks make use of existing wireless communication systems, and through the integration of systems, multiple systems can complement each other and can fully utilize their respective advantages.

Specifically, after the user equipment determines the valid subframe, it may be determined whether the reference signal corresponds to whether the CSI-IM is transmitted in the current valid subframe, and when the CSI-IM is not transmitted in the current valid subframe, determining the previous one according to the current valid subframe. Whether the calculated CSI of the reference signal transmitted by the effective subframe belongs to the first CSI set or the second CSI set.

Taking the structure diagram of the resource cell shown in FIG. 2 as an example, any reference signal corresponding to the target subframe belongs to the first CSI set and the second CSI set respectively. When the reference signal configuration information corresponding to the CSI Process is configuration 2, the current valid The sub-frame is the sub-frame 7. The user equipment determines that the CSI-IM is not transmitted in the sub-frame 7. The user equipment can determine whether the CSI calculated according to the reference signal transmitted by the previous valid sub-frame of the current valid sub-frame belongs to the first CSI set or the first Two CSI collections.

In an optional embodiment, after the user equipment determines the valid subframe, it may be determined whether the reference signal corresponds to whether the CSI-IM is transmitted in the current valid subframe, and when the reference signal corresponds to the CSI-IM transmitted in the current effective subframe, according to the reference. The reference signal transmitted in the currently valid subframe corresponding to the signal calculates the CSI of the CSI set to which the currently valid subframe belongs. For example, when the CSI-IM is transmitted in the current valid subframe, the user equipment may obtain the CSI set identifier information corresponding to the current valid subframe according to the channel set information, where the channel set information may include the CSI set identifier information corresponding to each subframe. Determining, according to the CSI set identifier information corresponding to the current valid subframe, a CSI set corresponding to the current valid subframe, and further calculating a CSI to which the current valid subframe belongs according to the reference signal transmitted in the currently valid subframe The CSI of the collection.

Taking the structure diagram of the resource cell shown in FIG. 2 as an example, any reference signal corresponding to the target subframe belongs to the first CSI set and the second CSI set respectively. When the reference signal configuration information corresponding to the CSI Process is configured as 0, the current valid The subframe is the subframe 1, and the user equipment determines that the CSI-IM is transmitted in the subframe 1, and the user equipment can calculate the CSI of the CSI set to which the subframe 1 belongs according to the reference signal transmitted in the subframe 1. For example, when it is determined that the CSI set to which the subframe 1 belongs is the first CSI set, the user equipment may calculate the CSI of the first CSI set according to the reference signal transmitted in the subframe 1. When it is determined that the CSI set corresponding to the subframe 1 is the second CSI set, the user equipment may calculate the CSI of the second CSI set according to the reference signal transmitted in the subframe 1.

S304. Calculate channel state information of a channel state information set different from a channel state information set to which the previous channel state information belongs according to the reference signal transmitted in the current effective subframe.

After determining whether the calculated CSI belongs to the first CSI set or the second CSI set according to the reference signal transmitted by the previous valid subframe of the current valid subframe, the user equipment may calculate the previous reference according to the reference signal transmitted in the currently valid subframe. The CSI to which the CSI belongs sets the CSI of different CSI sets. Taking the structure diagram of the resource cell shown in FIG. 2 as an example, any reference signal corresponding to the target subframe belongs to the first CSI set and the second CSI set respectively. When the reference signal configuration information corresponding to the CSI Process is configuration 2, the current valid The subframe is subframe 7, and the CSI-IM is not transmitted in the subframe 7, and the user equipment can determine whether the CSI calculated according to the reference signal transmitted in the first valid subframe before the subframe 7 belongs to the first CSI set or the second. The CSI set further calculates the CSI of the second CSI set corresponding to the subframe 7 according to the reference signal transmitted in the subframe 7. For example, if the first valid subframe before the subframe 7 is determined, that is, the CSI corresponding to the subframe 2 is the CSI of the CSI set 0, the user equipment can calculate the current CSI according to the reference signal transmitted in the subframe 7. The CSI sets the CSI of different CSI collections. When determining the first valid subframe before the subframe 7, that is, the CSI calculated by the reference signal transmitted in the subframe 2 belongs to the first CSI set, the user equipment may calculate the second according to the reference signal transmitted in the subframe 7. The CSI of the CSI set; when the CSI calculated according to the reference signal transmitted in the subframe 2 belongs to the second CSI set, the user equipment may calculate the CSI of the first CSI set according to the reference signal transmitted in the subframe 7.

S305. Feed channel state information corresponding to each of the multiple channel state information processes to the network side device.

The user equipment can feed back the CSI corresponding to the multiple CSI processes to the network side device. For example, after the user equipment can calculate the CSI corresponding to the CSI process, the CSI is sent to the network side device. Optionally, after the user equipment can calculate multiple CSIs corresponding to the CSI process, the calculated multiple CSIs are filtered to obtain an average value, and then the average value is sent to the network side device.

In the method for reporting the channel state information shown in FIG. 3, the plurality of reference signals respectively configured by the network side device for the multiple CSI processes are respectively occupied by the plurality of reference signals according to the preset time interval and the preset rule. Determining a valid subframe in the target subframe, when the reference signal corresponds to the CSI-IM not transmitted in the currently valid subframe, determining that the CSI calculated according to the reference signal transmitted by the previous valid subframe of the current valid subframe belongs to the first CSI And the CSI of the CSI set different from the CSI set to which the previous CSI belongs is calculated according to the reference signal transmitted in the current valid subframe, and the CSI corresponding to the multiple CSI processes is fed back to the network side device. It can ensure that the computational complexity of CSI is reduced and the hardware cost is reduced in a heterogeneous network scenario, and the number of calculations of the first CSI set and the second CSI set is relatively balanced.

Referring to FIG. 4, FIG. 4 is a schematic flowchart of a method for reporting channel state information according to a third embodiment of the present invention. The method for reporting channel state information in the embodiment of the present invention may include at least:

S401. Receive multiple reference signals respectively configured by the network side device for multiple channel state information processes.

The user equipment can receive multiple reference signals respectively configured by the network side device for multiple CSI processes. The plurality of reference signals are in one-to-one correspondence with the plurality of CSI processes, and each of the reference signals may include a CSI-RS and a CSI-IM that are periodically transmitted, and each of the subframes occupied by the reference signal is a target subframe. The signal transmitted in a target subframe is at least one of a CSI-RS and a CSI-IM.

Specifically, the network side device may configure multiple CSI processes for one serving cell, and then configure a reference signal for each CSI Process. For example, the network side device may determine the subframe occupied by the reference signal transmission according to the reference signal configuration information corresponding to each of the preset multiple CSI processes, and periodically send the reference signal through the foregoing subframe, and the user in the serving cell The device can receive multiple reference signals configured by the network side device for multiple CSI processes. After receiving the reference signals corresponding to the multiple CSI processes, the user equipment may determine, according to the reference signal configuration information corresponding to the multiple CSI processes, the subframe occupied by the reference signal during the transmission as the target subframe. The reference signal configuration information may include a period of the reference signal and an offset, or a subframe occupied by the reference signal when transmitting. The reference signal configuration information corresponding to the CSI process in the user equipment and the reference signal configuration information corresponding to the CSI process in the network side device are pre-negotiated, that is, the reference signal configuration information corresponding to the CSI Process in the user equipment and the CSI in the network side device The reference signal configuration information corresponding to the Process is the same.

Taking the structure diagram of the resource cell shown in FIG. 2 as an example, when the reference signal configuration information corresponding to the CSI process is configuration 0, the CSI-RS and CSI-IM cycles are both 5 ms, and the offset is 1 ms, that is, the network side. The device sends CSI-RS and CSI-IM every 5 ms, and the network side device transmits CSI-RS through the target subframe separated by 1 ms from subframe 0. And the CSI-IM, the target subframe that is separated from the subframe 0 by 1 ms is also the subframe 1, and the user equipment can determine that the CSI is transmitted through the subframes 1, 6, 11, and 16 according to the period and the offset of the reference signal. RS and CSI-IM, the user equipment can set the above subframe as the target subframe. Optionally, the reference signal configuration information corresponding to the CSI process may indicate that the subframe occupied by the reference signal is the subframes 1, 6, 11, and 16, and the user equipment may set the subframe as the target subframe.

When the reference signal configuration information corresponding to the CSI process is configuration 1, the CSI-RS and CSI-IM periods are both 5 ms, the CSI-RS offset is 2 ms, and the CSI-IM offset is 4 ms, the user equipment can determine The reference signals are transmitted through subframes 2, 4, 7, 9, 12, 14, 17, and 19, and the user equipment can set the above subframes as target subframes. Optionally, the reference signal configuration information corresponding to the CSI process may indicate that the subframe occupied by the reference signal is subframes 2, 4, 7, 9, 12, 14, 17, and 19, and the user equipment may set the subframe as the subframe. Target subframe.

When the reference signal configuration information corresponding to the CSI Process is configuration 2, the CSI-RS period is 5 ms, the CSI-IM period is 10 ms, the CSI-RS offset is 2 ms, and the CSI-IM offset is 0 ms. The device may determine that the reference signal is transmitted through subframes 0, 2, 7, 10, 12, and 17, and the user equipment may set the subframe as the target subframe. Optionally, the reference signal configuration information corresponding to the CSI process may indicate that the subframe occupied by the reference signal is subframes 0, 2, 7, 10, 12, and 17, and the user equipment may set the subframe as the target subframe.

S402. Determine, according to a preset time interval and a preset rule, a valid subframe from a target subframe that is occupied by each of the multiple reference signals.

The user equipment may determine valid subframes from the target subframes occupied by the plurality of reference signals respectively according to the preset time interval, where the time interval between two adjacent valid subframes corresponding to any reference signal is not Less than the preset time interval.

Preferably, the preset time interval may be 5 ms. The preset time interval is the optimal value after the reliability and complexity of the CSI are weighed. The periods of CSI-RS and CSI-IM can be 5ms, 10ms, 20ms, 40ms, and 80ms, and the shortest period of CSI-RS and CSI-IM is 5ms. When the preset time interval is less than 5 ms, the reference signal transmitted in the effective subframe includes the reference signal of each period, and the reliability of the CSI is high, but the calculated CSI is still relatively large, and the computational complexity of the CSI cannot be effectively solved. When the preset time interval is greater than 5 ms, the calculated CSI is significantly reduced, but the reference signal transmitted in the effective subframe may only include the reference signal of the partial period, and the reliability of the CSI is low, the preset time interval is 5 ms. It is the best value after the balance of reliability and complexity of CSI. It should be noted that the preset time interval in the embodiment of the present invention includes, but is not limited to, 5 ms. For example, in a future communication system, the shortest period of the CSI-RS and the CSI-IM is 10 ms, and the user equipment needs to weigh the CSI. Reliability and complexity to determine the time interval.

In an alternative embodiment, the preset rule may be:

(1) When the periods of the CSI-RS and the CSI-IM in the reference signal are the same and the offsets are the same, the user equipment may determine that the first target subframe corresponding to the reference signal is the first valid subframe, and is in the reference signal. In the target subframe after the corresponding n-1th effective subframe, determining that the target subframe with the smallest interval between the n-1th effective subframe and the preset time interval is the nth Valid subframe. The offset between the CSI-RS and the CSI-IM is the same, that is, the time interval between the target subframe of the first transmission CSI-RS and the subframe 0, and between the target subframe and the subframe 0 of the first transmission CSI-IM. The time interval is the same. Where n is a positive integer greater than one.

Taking the structure diagram of the resource cell shown in Figure 2 as an example, when the reference signal configuration information corresponding to the CSI Process is configuration 0, the CSI-RS and CSI-IM cycles are both 5 ms, and the CSI-RS and CSI-IM are biased. If the shift is 1 ms, the user equipment may determine that the CSI-RS and the CSI-IM have the same period in the reference signal corresponding to the CSI process, and the offsets of the CSI-RS and the CSI-IM in the reference signal are the same, that is, the subframe 1, CSI-RS and CSI-IM are transmitted in 6, 11, and 16, and subframes 1, 6, 11, and 16 are target subframes. The user equipment may determine that the subframe 1 is the first valid subframe, where the preset time interval is 5 ms, and the user equipment may determine the first valid subframe in the target subframe after the first valid subframe. The target subframes whose time interval is not less than the preset time interval are subframes 6, 11, and 16, and the subframes with the shortest time interval between the first valid subframe and the first valid subframe are determined in subframes 6, 11, and 16. The subframe is subframe 6, that is, subframe 6 is the second valid subframe. Similarly, the user equipment may determine, in the target subframe after the second valid subframe, that the target subframe with the time interval between the second valid subframe and the second valid subframe is not less than the preset time interval, and is the subframes 11 and 16 Further, in the subframes 11 and 16, it is determined that the target subframe having the shortest time interval from the second valid subframe is the subframe 11, that is, the subframe 11 is the third effective subframe. Similarly, the user equipment may determine, in the target subframe after the third valid subframe, that the target subframe with the time interval of the third valid subframe is not less than the preset time interval is the subframe 16, The user equipment can determine that subframe 16 is the fourth valid subframe. That is to say, the valid subframes are subframes 1, 6, 11, and 16, wherein the reference signal transmitted in the valid subframe can be referred to the gray portion corresponding to configuration 0 in FIG.

(2) When the periods of the CSI-RS and the CSI-IM in the reference signal are different, or when the periods of the CSI-RS and the CSI-IM in the reference signal are the same but the offsets are different, the first transmission CSI corresponding to the reference signal is acquired. The target subframe of the RS, and the target subframe of the first transmission CSI-IM corresponding to the reference signal.

If the target subframe of the first transmission CSI-RS is located before the target subframe of the first transmission CSI-IM, determining that the target subframe of the first transmission CSI-IM is the first valid subframe;

In the target subframe after the n-1th valid subframe corresponding to the reference signal, determining a target subframe with a minimum time interval from the (n-1)th effective subframe and not less than a preset time interval is The nth valid subframe. Where n is a positive integer greater than one.

Taking the structure diagram of the resource cell shown in FIG. 2 as an example, when the reference signal configuration information corresponding to the CSI Process is configuration 1, the CSI-RS and CSI-IM cycles are both 5 ms, and the CSI-RS offset is 2 ms. The offset of the CSI-IM is 4 ms, and the user equipment can determine that the target subframe is subframes 2, 4, 7, 9, 12, 14, 17, and 19. The user equipment may determine that the CSI-RS and the CSI-IM have the same period but different offsets in the reference signal corresponding to the CSI process, where the target subframe in which the CSI-RS is transmitted in the first is the subframe 2, and the first one transmits the CSI- The target subframe of the IM is subframe 4. The CSI-RS is transmitted in the subframe 2, and the reference signal is not transmitted in the subframe before the subframe 2. The user equipment can only obtain the channel estimation result H according to the CSI-RS transmitted in the subframe 2, and the interference information P cannot be obtained. It is impossible to calculate the CSI. The user equipment may obtain the channel estimation result H according to the CSI-RS transmitted in the subframe 2, and may acquire the interference information P according to the CSI-IM transmitted in the subframe 4, and further calculate the CSI according to the channel estimation result H and the interference information P, The user equipment can determine that subframe 4 is the first valid subframe.

The preset time interval may be 5 ms, and the user equipment may determine, in the target subframe after the first valid subframe, that the time interval between the first valid subframe and the first valid subframe is not less than a preset time interval. The subframes are subframes 9, 12, 14, 17, and 19. Further, in the subframe, the target subframe with the shortest time interval from the first valid subframe is determined to be the subframe 9, that is, the subframe 9 is the first subframe. 2 valid subframes. Similarly, the user equipment may determine, in the target subframe after the second valid subframe, that the target subframe with the time interval between the second valid subframe and the second valid subframe is not less than the preset time interval, and is the subframe 14, 17 And 19, and further determining, in the subframes 14, 17 and 19, that the target subframe having the shortest time interval from the second valid subframe is the subframe 14, that is, the subframe 14 is the third effective subframe. Similarly, the user equipment may determine, in the target subframe after the third valid subframe, that the target subframe with the time interval of the third valid subframe is not less than the preset time interval is the subframe 19, The user equipment can determine that subframe 19 is the fourth valid subframe. That is to say, the valid subframes are subframes 4, 9, 14, and 19, and the reference signals transmitted in the effective subframe can be referred to the gray portion corresponding to configuration 1 in FIG.

(3) When the periods of the CSI-RS and the CSI-IM in the reference signal are different, or when the periods of the CSI-RS and the CSI-IM in the reference signal are the same but the offsets are different, the first transmission CSI corresponding to the reference signal is acquired. a target subframe of the RS, and a target subframe of the first transmission CSI-IM corresponding to the reference signal;

If the target subframe of the first transmission CSI-RS is located after the target subframe of the first transmission CSI-IM, determine that the target subframe of the first transmission CSI-RS is the first valid subframe;

In the target subframe after the n-1th valid subframe corresponding to the reference signal, determining a target subframe with a minimum time interval from the (n-1)th effective subframe and not less than a preset time interval is The nth valid subframe;

Where n is a positive integer greater than one.

Taking the structure diagram of the resource cell shown in FIG. 2 as an example, when the reference signal configuration information corresponding to the CSI Process is configuration 2, the CSI-RS period is 5 ms, the CSI-IM period is 10 ms, and the CSI-RS offset is 2 ms, the offset of the CSI-IM is 0 ms, the user equipment can determine that the target subframe is subframes 0, 2, 7, 10, 12, and 17, and the user equipment can determine the CSI-RS and the reference signal corresponding to the CSI Process. The cycle and offset of the CSI-IM are different. The target subframe in which the first CSI-RS is transmitted is the subframe 2, the target subframe in which the CSI-IM is transmitted in the first frame is the subframe 0, and the CSI-IM is transmitted in the subframe 0, and the user equipment is based on the subframe 0. The CSI-IM transmitted in the middle can only obtain the interference information P, and cannot obtain the channel estimation result H, and thus cannot calculate the CSI. The user equipment can obtain the interference information P according to the CSI-IM transmitted in the subframe 0, and the channel estimation result H can be obtained according to the CSI-RS transmitted in the subframe 2, and the user equipment can determine that the subframe 2 is the first valid subframe. .

The preset time interval may be 5 ms, and the user equipment may determine, in the target subframe after the first valid subframe, that the time interval between the first valid subframe and the first valid subframe is not less than a preset time interval. The frame is subframes 7, 10, 12, and 17, and further, in the subframe, the target subframe with the shortest time interval from the first valid subframe is determined to be subframe 7, that is, subframe 7 is the second effective. Subframe. Similarly, the user equipment may determine, in the target subframe after the second valid subframe, that the target subframe with the time interval between the second valid subframe and the second valid subframe is not less than the preset time interval, and is the subframes 12 and 17 Further, in the subframe, it is determined that the target subframe having the shortest time interval from the second valid subframe is the subframe 12, that is, the subframe 12 is the third effective subframe. Similarly, the user equipment may determine, in the target subframe after the third effective subframe, that the target subframe with the time interval of the third valid subframe is not less than the preset time interval is the subframe 17, The user equipment can determine that subframe 17 is the fourth valid subframe. That is to say, the valid subframes are subframes 2, 7, 12, and 17, wherein the reference signals transmitted in the effective subframe can be referred to the gray portion corresponding to configuration 2 in FIG.

S403. Determine whether the number of channel state information to be currently calculated is greater than a preset number threshold.

The user equipment can determine whether the number of channel state information to be currently calculated is greater than a preset number threshold. When the determination result is YES, step S404 is further performed; when the determination result is no, the corresponding CSI is calculated according to the reference signals transmitted in the valid subframes corresponding to the CSI processes corresponding to the CSI currently to be calculated.

In an optional embodiment, when the user equipment works in the CA state, if the number of carriers is two, each serving cell can be configured with up to four CSI Processes, that is, the user equipment needs to calculate eight CSI Process corresponding For each serving cell, the preset time interval between valid subframes is 5 ms, and the CSI corresponding to the eight CSI processes needs to be calculated in 5 ms. The user equipment supports calculation of CSI corresponding to two CSI processes in each subframe. , can complete the CSI calculation of all CSI Process. The user equipment can set the preset number threshold to 2, that is, calculate the CSI corresponding to the maximum of 2 CSI processes in each subframe, and effectively reduce the computational complexity of the CSI without affecting the CSI reliability. It should be noted that the preset number of thresholds in the embodiment of the present invention includes, but is not limited to, 2, and the research and development personnel may perform corresponding modifications in combination with different scenarios, which are not specifically limited by the embodiments of the present invention.

S404. Determine, in a channel state information process corresponding to the multiple channel state information, a target channel state information process that meets a preset number threshold.

The user equipment may determine a target CSI Process that satisfies a preset number threshold in a CSI process corresponding to the CSI.

In an optional embodiment, the user equipment may determine a target CSI Process that meets a preset number threshold according to a priority of a process number of each CSI process. For example, the network side device configures two CSI processes for the user equipment, namely CSI Process1 and CSI Process2, and the user equipment can obtain the priority of each CSI Process according to the priority of the process number of each CSI process, where CSI Process1 takes precedence. The level is higher than CSI Process2. When the preset number threshold is 1, the target CSI Process that meets the preset number threshold may be CSI Process1.

In an optional embodiment, the user equipment may determine, according to the priority of the process number of each CSI process, and the priority of the serving cell number of the serving cell corresponding to the CSI process with the same priority of the process number, determine that the preset number threshold is met. Target CSI Process. For example, the user equipment works in the CA state, and the number of carriers is two. The network side device configures two CSI processes for the first serving cell CC1, namely CSI Process1 and CSI Process2, and the network side device returns the second service. The cell CC2 is configured with two CSI Processes, namely CSI Process1 and CSI Process2. The user equipment may obtain the priority of each CSI process according to the priority of the process ID of the four CSI processes, where the priority of CSI Process1 of CC1 is higher than the CSI Process2 of CC1 and the CSI Process2 of CC2, and the priority of CSI Process1 of CC2 CSI Process2 above CC1 and CSI Process2 of CC2. The user equipment can obtain the priority of the CSI Process with the same priority of the process number according to the priority of the serving cell number of the serving cell. For example, the user equipment may determine that the CSI Process1 of CC1 has a higher priority than the CSI Process1 of CC2 according to the priority of the serving cell number, and the CSI Process2 of CC1 has a higher priority than the CSI Process2 of CC2. When the preset number threshold When 2, the target CSI Process that satisfies the preset number threshold may be CSI Process1 of CC1 and CSI Process1 of CC2.

In an optional embodiment, when detecting that the CSI processes corresponding to the multiple CSIs include the CSI Process of the serving cell in the single-point transmission mode, the CSI Process of the serving cell that determines the single-point transmission mode has the highest priority. For example, the user equipment works in the CA state, and the number of carriers is two. The transmission mode of the first serving cell CC1 is a single-point transmission mode, that is, the non-CoMP mode, and the network side device configures two for the second serving cell CC2. The CSI Process is CSI Process1 and CSI Process2, respectively, where the CSI Process of CC1 has a higher priority than CSI Process1 and CSI Process2 of CC2. When the preset number threshold is 2, the target CSI Process that satisfies the preset number threshold may be the CSI Process of CC1 and the CSI Process1 of CC2.

Further, any target subframe corresponding to the CSI process of the serving cell in the single-point transmission mode is a valid subframe, and the reference signal transmitted in any target subframe is a serving cell-specific reference of the single-point transmission mode. signal.

S405. Calculate corresponding channel state information according to the reference signal transmitted in the effective subframe according to the target channel state information process.

The user equipment may calculate a corresponding CSI according to the reference signal transmitted in the corresponding valid subframe of the target CSI process.

In an optional embodiment, when the reference signal transmitted in the reference signal corresponding to the valid subframe includes the CSI-RS and the CSI-IM, the corresponding CSI is calculated according to the CSI-RS and the CSI-IM transmitted in the valid subframe.

In an optional embodiment, when the reference signal transmitted in the reference signal corresponding to the valid signal includes the CSI-RS, the corresponding CSI-RS transmitted in the valid subframe and the CSI-IM transmitted before the valid subframe are calculated. CSI.

In an optional embodiment, when the reference signal transmitted in the reference subframe corresponding to the valid signal includes the CSI-IM, the corresponding CSI-IM transmitted in the valid subframe and the CSI-RS transmitted before the valid subframe are calculated. CSI.

S406. Calculate corresponding channel state information in the specified target subframe after the valid subframe according to the reference signal transmitted in the effective subframe according to the other channel state information processes.

The user equipment may calculate corresponding channel state information in the specified target subframe after the valid subframe according to the reference signal transmitted in the corresponding valid subframe of the other CSI processes in the CSI process corresponding to the current CSI to be calculated.

Specifically, in the downlink CoMP system, the network side device can configure up to four CSI processes for one serving cell. In a CA scenario, carriers of multiple serving cells may be aggregated. With the resource grid shown in Figure 5 For example, the user equipment works in the CA state, and the number of carriers is three. The transmission mode of the first serving cell CC0 is a non-CoMP mode, that is, a single-point transmission mode; and the transmission mode of the second serving cell CC1 is a CoMP mode. The network side device configures two CSI processes for CC1. The transmission mode of the third serving cell CC2 is CoMP mode, and the network side device configures two CSI processes for CC2.

The serving cell in the non-CoMP mode corresponds to a CSI process, and the reference signal is transmitted in each subframe of the CSI process, and each subframe needs to calculate CSI, and then each subframe in the CSI Process corresponding to the serving cell in the non-CoMP mode is determined to be valid. a subframe, where the reference signal may be a Cell-Specific Reference Signal (CRS) in a non-CoMP mode. The priority of the CSI process corresponding to the serving cell in the non-CoMP mode is higher than the priority of the CSI process corresponding to the serving cell in the CoMP mode. As shown in FIG. 5, the user equipment may determine that the subframes 0 to 19 are valid subframes, and the reference signal transmitted in the valid subframe may be referred to the gray portion corresponding to CC0 in FIG.

The network side device configures two CSI processes for the serving cell CC1 in the CoMP mode, and then configures a CSI-RS1 and a CSI-IM1 for the CSI Process1, and the user equipment can determine that the effective subframe includes the subframes 4, 9, 14, and 19. For the reference signal transmitted in the valid subframe, refer to the gray part corresponding to CSI Process1 of CC1 in FIG. 5. The network side device configures a CSI-RS2 and a CSI-IM2 for the CSI Process2, and the user equipment can determine that the effective subframe includes the subframes 4, 9, 14, and 19. The reference signal transmitted in the effective subframe can be seen in FIG. The gray part of CC1's CSI Process2.

The network side device configures two CSI processes for the serving cell CC2 in the CoMP mode, and then configures a CSI-RS1 and a CSI-IM1 for the CSI Process1, and the user equipment can determine that the effective subframe includes the subframes 2, 7, 12, and 17 For the reference signal transmitted in the valid subframe, refer to the gray part corresponding to CSI Process1 of CC2 in FIG. The network side device configures a CSI-RS2 and a CSI-IM2 for the CSI Process2, and the user equipment can determine that the effective subframe includes the subframes 4, 9, 14, and 19. The reference signal transmitted in the effective subframe can be seen in FIG. The gray part of CC2's CSI Process2.

In the structure diagram of the resource cell shown in FIG. 5, when the preset number threshold is 2, the CSI process corresponding to the CSI currently to be calculated in the subframe 2 includes the CSI Process of the CC0 and the CSI Process1 of the CC2, and the user equipment can determine the current waiting. The number of the calculated CSI is equal to the preset number threshold, and the corresponding CSI is calculated according to the reference signals transmitted in the corresponding valid subframes of the CSI processes corresponding to the CSI currently to be calculated.

In the structure diagram of the resource cell shown in FIG. 5, when the preset number threshold is 2, the CSI process corresponding to the CSI currently to be calculated in the subframe 4 includes the CSI Process of CC0, the CSI Process of CC1, and the CSI of CC1. Process 2 and CSI Process 2 of CC2, the user equipment may determine that the number of CSIs to be currently calculated is greater than a preset number threshold. The user equipment may determine that the multiple CSI processes are ranked according to the priority from high to low: CSI Process of CC0, CSI Process1 of CC1, CSI Process2 of CC1, and CSI Process2 of CC2, and the target CSI Process satisfying the preset number threshold includes CC0. CSI Process and CSI Process1 of CC1, other CSI Processes include CSI Process2 of CC1 and CSI Process2 of CC2.

The user equipment may calculate the CSI corresponding to the CSI Process of the CC0 according to the reference signal transmitted in the subframe 4 corresponding to the CSI Process of the CC0, and calculate the CSI Process1 of the CC1 according to the reference signal transmitted in the subframe 4 corresponding to the CSI Process1 of the CC1. Corresponding CSI.

Further, the CSI process corresponding to the CSI currently to be calculated in the subframe 5 includes the other CSI processes in the subframe 4 and the CSI process in the CC0 in the subframe 5, that is, the CSI process corresponding to the CSI currently to be calculated in the subframe 5 includes the CC0. The CSI Process, the CSI Process 2 of the CC1, and the CSI Process 2 of the CC2, the user equipment may calculate the CSI corresponding to the CSI Process of the CC0 according to the reference signal transmitted in the CSI Process corresponding to the C0 Process of the CC0, and the corresponding subframe 4 of the CSI Process2 according to the CC1. The reference signal transmitted in the middle calculates the CSI corresponding to CSI Process2 of CC1.

Further, the CSI process corresponding to the CSI currently to be calculated in the subframe 6 includes the CSI Process2 of the CC2 in the subframe 4 and the CSI Process of the CC0 in the subframe 6, that is, the CSI process corresponding to the CSI currently to be calculated in the subframe 6 includes the CC0. The CSI Process and the CSI Process2 of the CC2, the user equipment may calculate the CSI corresponding to the CSI Process of the CC0 according to the reference signal transmitted in the CSI Process corresponding to the CC0, and the reference transmitted in the subframe 4 according to the CSI Process2 of the CC2. Signal, calculate the CSI corresponding to CSI Process2 of CC2.

In the prior art, the user equipment needs to calculate the CSI corresponding to the four CSI processes in the subframe 4. In the embodiment of the present invention, time division multiplexing is used to ensure that at most two CSIs are calculated in each subframe, which effectively reduces the computational complexity of the CSI.

S407. The channel state information corresponding to each of the multiple channel state information processes is fed back to the network side device.

The user equipment can feed back the CSI corresponding to the multiple CSI processes to the network side device. For example, after the user equipment can calculate the CSI corresponding to the CSI process, the CSI is sent to the network side device. Optionally, after the user equipment can calculate multiple CSIs corresponding to the CSI process, the calculated multiple CSIs are filtered to obtain an average value, and then the average value is sent to the network side device.

In the method for reporting channel state information shown in FIG. 4, the receiving network side device is configured as multiple CSI processes respectively. The plurality of reference signals are configured to determine valid subframes from the target subframes occupied by the plurality of reference signals according to the preset time interval and the preset rule, and determine that the number of CSIs to be calculated is greater than a preset threshold. Determining a target CSI process that meets a preset number threshold in a CSI process corresponding to multiple CSIs, and calculating corresponding CSI according to reference signals transmitted in respective valid subframes of the target CSI process, and corresponding effective subframes according to other CSI processes The reference signal transmitted in the medium, the corresponding CSI is calculated in the specified target subframe after the valid subframe, and the CSI corresponding to each of the multiple CSI processes is fed back to the network side device, and the embodiment of the present invention can perform between valid subframes. Time division multiplexing effectively reduces the computational complexity of channel state information and reduces hardware costs.

Referring to FIG. 6 , FIG. 6 is a schematic structural diagram of a user equipment according to a first embodiment of the present invention. The user equipment provided by the embodiment of the present invention corresponds to the method shown in FIG. 1 and can be operated in FIG. 1 . In the execution body of the method for reporting the channel state information, the user equipment in the embodiment of the present invention may include at least a receiving unit 601, a determining unit 602, a calculating unit 603, and a feedback unit 604, where:

The receiving unit 601 is configured to receive, by the network side device, multiple reference signals respectively configured for multiple CSI processes, where the multiple reference signals are in one-to-one correspondence with the multiple CSI processes, where each reference signal includes periodic sending CSI-RS and CSI-IM, and each subframe referenced by the reference signal is a target subframe, and the signal transmitted in any target subframe is at least the CSI-RS and the CSI-IM One.

a determining unit 602, configured to determine, according to a preset time interval and a preset rule, a valid subframe from a target subframe occupied by each of the multiple reference signals, where two adjacent to each reference signal The time interval between valid subframes is not less than the preset time interval.

The calculating unit 603 is configured to calculate CSI corresponding to each of the multiple CSI processes according to the reference signals transmitted in the effective subframes of the plurality of reference signals respectively.

The feedback unit 604 is configured to feed back the CSI corresponding to each of the multiple CSI processes to the network side device.

As an optional implementation manner, the preset rule may include:

When the periods of the CSI-RS and the CSI-IM in the reference signal are the same and the offsets are the same, determining that the first target subframe corresponding to the reference signal is the first valid subframe, and in the reference signal Determining, in the target subframe after the n-1th valid subframe, a target subframe with a minimum time interval from the (n-1)th effective subframe and not less than the preset time interval Is the nth valid subframe. or

Obtaining a first period corresponding to the reference signal when a period of the CSI-RS and the CSI-IM in the reference signal is different, or a period of the CSI-RS and the CSI-IM in the reference signal is the same but the offset is different Transfer CSI-RS a target subframe, and a target subframe of the first transmission CSI-IM corresponding to the reference signal;

If the target subframe of the first transmission CSI-RS is located before the target subframe of the first transmission CSI-IM, determining that the target subframe of the first transmission CSI-IM is the initial effective subframe;

If the target subframe of the first transmission CSI-RS is located after the target subframe of the first transmission CSI-IM, determining that the target subframe of the first transmission CSI-RS is the initial effective subframe;

Determining, in a target subframe after the n-1th valid subframe corresponding to the reference signal, a time interval between the n-1th valid subframe and a minimum time interval of not less than the preset time interval One target subframe is the nth valid subframe;

Where n is a positive integer greater than one.

As an optional implementation manner, any one of the reference signal corresponding to the target subframe belongs to the first CSI set and the second CSI set, respectively.

The calculating unit 603 is configured to: when the reference signal corresponds to the CSI-IM not transmitted in the current valid subframe, determine that the CSI calculated according to the reference signal transmitted by the previous valid subframe of the current active subframe belongs to the first CSI The set is also the second CSI set, and calculates the CSI of the CSI set different from the CSI set to which the previous CSI belongs according to the reference signal transmitted in the currently valid subframe.

The calculating unit 603 is further configured to: when the CSI-IM is transmitted in the currently valid subframe corresponding to the reference signal, calculate the current valid actor according to the reference signal transmitted in the currently valid subframe corresponding to the reference signal CSI of the CSI set to which the frame belongs.

As an optional implementation manner, the user equipment in the embodiment of the present invention may further include:

The determining unit 605 is configured to determine, by the calculating unit 603, the CSI corresponding to the current CSI before calculating the CSI corresponding to each of the multiple CSI processes according to the reference signals transmitted in the effective subframes of the plurality of reference signals respectively. Whether the quantity is greater than the preset number threshold.

The determining unit 602 is further configured to: when the determining unit 605 determines that the result is YES, determine, in the CSI Process corresponding to the multiple CSIs, a target CSI Process that meets the preset number threshold.

The calculating unit 603 is further configured to calculate a corresponding CSI according to the reference signal transmitted in the corresponding valid subframe of the target CSI process, and corresponding to the other valid CSI processes in the CSI process corresponding to the multiple CSIs The reference signal transmitted in the frame calculates a corresponding CSI in the specified target subframe after the valid subframe.

The calculating unit 603 is further configured to: when the determining unit 605 determines that the result is negative, according to the CSI pair The corresponding CSI Process respectively corresponds to the reference signal transmitted in the effective subframe, and the corresponding CSI is calculated.

As an optional implementation manner, the determining unit 602 is configured to determine, according to a priority of a process ID of the CSI process corresponding to each of the multiple CSIs, a target CSI process that meets the preset number threshold.

As an optional implementation manner, the determining unit 602 is configured to: according to a priority of a process number of a CSI process corresponding to each of the multiple CSIs, and a serving cell corresponding to a CSI process with the same priority of the process number The priority of the serving cell number determines a target CSI Process that satisfies the preset number threshold.

As an optional implementation manner, the determining unit 602 is configured to determine, when the CSI process corresponding to the multiple CSIs includes a CSI process of a serving cell of a single-point transmission mode, determine a serving cell of the single-point transmission mode. The CSI Process has the highest priority.

As an optional implementation manner, any target subframe corresponding to the CSI process of the serving cell in the single-point transmission mode is a valid subframe, and the reference signal transmitted in any target subframe is the single point. The serving cell specific reference signal of the transmission mode.

As an optional implementation manner, the determining unit 602 is further configured to calculate, by the calculating unit 603, a specified subframe after the valid subframe according to the reference signal transmitted in the corresponding valid subframe of the other CSI processes. Before the corresponding CSI, it is determined that the number of CSIs to be calculated in the specified target subframe is not greater than the preset number threshold.

As an optional implementation manner, the calculating unit 603 is configured to: when the reference signal transmitted in the effective subframe corresponding to the reference signal includes a CSI-RS and a CSI-IM, according to the transmission in the valid subframe CSI-RS and CSI-IM calculate the corresponding CSI.

The calculating unit 603 is further configured to: when the reference signal transmitted in the effective subframe corresponding to the reference signal includes a CSI-RS, according to the CSI-RS transmitted in the valid subframe and the CSI transmitted recently before the valid subframe -IM, calculate the corresponding CSI.

The calculating unit 603 is further configured to: when the reference signal transmitted in the valid subframe corresponding to the reference signal includes CSI-IM, according to the CSI-IM transmitted in the valid subframe and the CSI transmitted recently before the valid subframe -RS, calculate the corresponding CSI.

In the user equipment shown in FIG. 6, the receiving unit 601 receives a plurality of reference signals respectively configured by the network side device for multiple CSI processes, and the determining unit 602 separately obtains multiple reference signals according to a preset time interval and a preset rule. Determining the effective subframes in the target subframes that are occupied by the respective ones, the calculating unit 603 calculates the CSIs corresponding to the plurality of CSI processes according to the reference signals transmitted in the respective effective subframes, and the feedback unit 604 Feeding the corresponding CSIs of multiple CSI processes to the network side device can reduce the computational complexity of the channel state information and reduce the hardware cost.

Referring to FIG. 7, FIG. 7 is a schematic structural diagram of a user equipment according to a second embodiment of the present invention, for performing a method for reporting channel state information provided by an embodiment of the present invention. As shown in FIG. 7, the user equipment includes at least one processor 701, such as a CPU, at least one network interface 703, a memory 704, and at least one communication bus 702. Communication bus 702 is used to implement connection communication between these components. The memory 704 may include a high speed RAM memory, and may also include a non-volatile memory, such as at least one disk memory. The memory 704 can optionally include at least one storage device located remotely from the aforementioned processor 701. A set of program codes is stored in the memory 704, and the processor 701 calls the program code stored in the memory 704 for performing the following operations:

Receiving, by the network interface 703, a plurality of reference signals respectively configured by the network side device for the multiple CSI processes, where the plurality of reference signals are in one-to-one correspondence with the multiple CSI processes, where each reference signal includes a periodically sent CSI -RS and CSI-IM, and the subframe occupied by each reference signal at the time of transmission is a target subframe, and the signal transmitted in any target subframe is at least one of the CSI-RS and the CSI-IM.

Determining, according to a preset time interval and a preset rule, a valid subframe from a target subframe respectively occupied by the plurality of reference signals, where between two adjacent valid subframes corresponding to any reference signal The time interval is not less than the preset time interval.

Calculating CSI corresponding to each of the plurality of CSI processes according to the reference signals transmitted in the effective subframes of the plurality of reference signals respectively.

The CSI corresponding to each of the multiple CSI processes is fed back to the network side device through the network interface 703.

As an optional implementation manner, the preset rule may include:

When the periods of the CSI-RS and the CSI-IM in the reference signal are the same and the offsets are the same, determining that the first target subframe corresponding to the reference signal is the first valid subframe, and in the reference signal Determining, in the target subframe after the n-1th valid subframe, a target subframe with a minimum time interval from the (n-1)th effective subframe and not less than the preset time interval Is the nth valid subframe. or

Obtaining a first period corresponding to the reference signal when a period of the CSI-RS and the CSI-IM in the reference signal is different, or a period of the CSI-RS and the CSI-IM in the reference signal is the same but the offset is different Transmitting a target subframe of the CSI-RS, and a target subframe of the first transmission CSI-IM corresponding to the reference signal;

If the target subframe of the first transmission CSI-RS is located before the target subframe of the first transmission CSI-IM, determining that the target subframe of the first transmission CSI-IM is the initial effective subframe;

If the target subframe of the first transmission CSI-RS is located after the target subframe of the first transmission CSI-IM, determining that the target subframe of the first transmission CSI-RS is the initial effective subframe;

Determining, in a target subframe after the n-1th valid subframe corresponding to the reference signal, a time interval between the n-1th valid subframe and a minimum time interval of not less than the preset time interval One target subframe is the nth valid subframe;

Where n is a positive integer greater than one.

As an optional implementation manner, any one of the reference signal corresponding to the target subframe belongs to the first CSI set and the second CSI set, respectively.

The processor 701 calculates the CSI corresponding to each of the multiple CSI processes according to the reference signals transmitted in the valid subframes of the plurality of reference signals, which may be:

Determining whether the CSI calculated according to the reference signal transmitted by the previous valid subframe of the current valid subframe belongs to the first CSI set or the second CSI set, when the reference signal corresponds to the untransmitted CSI-IM in the currently valid subframe. And calculating, according to the reference signal transmitted in the currently valid subframe, a CSI of a CSI set different from a CSI set to which the previous CSI belongs.

Calculating CSI of the CSI set to which the current valid subframe belongs according to the reference signal transmitted in the currently valid subframe corresponding to the reference signal, when the CSI-IM is transmitted in the currently valid subframe. .

As an optional implementation manner, the processor 701 may perform the following operations before calculating the CSI corresponding to each of the multiple CSI processes according to the reference signals transmitted in the valid subframes of the multiple reference signals, respectively:

It is determined whether the current number of CSIs to be calculated is greater than a preset number threshold.

When the determination result is YES, the target CSI Process that satisfies the preset number threshold is determined in the CSI Process corresponding to the multiple CSIs.

Calculating a corresponding CSI according to the reference signal transmitted in the valid subframe in the target CSI process, and according to the reference signals transmitted in the valid subframes of the other CSI processes in the CSI processes corresponding to the multiple CSIs, The specified target subframe after the valid subframe is calculated to calculate the corresponding CSI.

When the result of the determination is no, the CSI corresponding to the CSI is corresponding to the reference signal transmitted in the valid subframe, and the corresponding CSI is calculated.

As an optional implementation manner, the processor 701 determines, in the CSI process corresponding to the multiple CSIs, a target CSI process that meets the preset number threshold, which may be specifically:

Determining, according to a priority of a process number of a CSI process corresponding to each of the plurality of CSIs, a target CSI Process that satisfies the preset number threshold.

As an optional implementation manner, the processor 701 determines, in the CSI process corresponding to the multiple CSIs, a target CSI process that meets the preset number threshold, which may be specifically:

Determining a target that satisfies the preset number threshold according to a priority of a process number of a CSI process corresponding to each of the multiple CSIs, and a priority of a serving cell number of the serving cell corresponding to the CSI process having the same priority of the process number CSI Process.

As an optional implementation manner, the processor 701 determines, in the CSI process corresponding to the multiple CSIs, a target CSI process that meets the preset number threshold, which may be specifically:

When detecting that the CSI processes corresponding to the multiple CSIs include the CSI Process of the serving cell in the single-point transmission mode, determining that the CSI process of the serving cell of the single-point transmission mode has the highest priority.

As an optional implementation manner, any target subframe corresponding to the CSI process of the serving cell in the single-point transmission mode is a valid subframe, and the reference signal transmitted in any target subframe is the single point. The serving cell specific reference signal of the transmission mode.

As an optional implementation manner, the processor 701 may perform the following according to the reference signal transmitted in the corresponding valid subframe of the other CSI processes, before calculating the corresponding CSI in the specified subframe after the valid subframe. operating:

Determining that the number of CSIs to be calculated in the specified target subframe is not greater than the preset number threshold.

As an optional implementation manner, the processor 701 determines, in the CSI process corresponding to the multiple CSIs, a target CSI process that meets the preset number threshold, which may be specifically:

When the reference signal transmitted in the valid subframe corresponding to the reference signal includes a CSI-RS and a CSI-IM, the corresponding CSI is calculated according to the CSI-RS and the CSI-IM transmitted in the valid subframe.

When the reference signal transmitted in the valid subframe corresponding to the reference signal includes a CSI-RS, calculating a corresponding CSI according to the CSI-RS transmitted in the valid subframe and the CSI-IM transmitted recently before the valid subframe. .

When the reference signal transmitted in the valid subframe corresponding to the reference signal includes CSI-IM, calculate a corresponding CSI according to the CSI-IM transmitted in the valid subframe and the CSI-RS transmitted recently before the valid subframe. .

Specifically, the user equipment introduced in the embodiment of the present invention may be used to implement the present invention in conjunction with FIG. 1 and FIG. 3 and Figure 4 illustrates some or all of the flow of method embodiments for reporting channel state information.

Referring to FIG. 8, FIG. 8 is a schematic structural diagram of a communication system according to an embodiment of the present invention. As shown in the figure, the communication system in the embodiment of the present invention may include at least a first network side device 1001 and a user equipment 804, where :

The first network side device 801 is configured to send, to the user equipment 804, multiple reference signals respectively configured for multiple CSI processes.

The user equipment 804 is configured to receive multiple reference signals sent by the first network side device 801, where the multiple reference signals are in one-to-one correspondence with the multiple CSI processes, where each reference signal includes a CSI that is periodically sent. The RS and the CSI-IM, and the subframe occupied by each reference signal during transmission is a target subframe, and the signal transmitted in any target subframe is at least one of the CSI-RS and the CSI-IM.

The user equipment 804 is further configured to determine, according to a preset time interval and a preset rule, a valid subframe from a target subframe occupied by each of the multiple reference signals, where two phases corresponding to any reference signal The time interval between adjacent valid subframes is not less than the preset time interval.

The user equipment 804 is further configured to calculate CSI corresponding to each of the multiple CSI processes according to the reference signals transmitted in the respective valid subframes of the multiple reference signals.

The user equipment 804 is further configured to feed back the CSI corresponding to each of the multiple CSI processes to the network side device.

As an optional implementation manner, the communication system in the embodiment of the present invention may further include a second network side device 1002 and a third network side device 1003.

Specifically, in the downlink CoMP system, the first network side device 1001 can configure up to four CSI processes for the serving cell. In a CA scenario, carriers of multiple serving cells may be aggregated. The configuration of the resource cell shown in FIG. 5 is taken as an example. The user equipment 1004 works in the CA state, and the number of carriers is three. The third network side device 1003 can send the cell corresponding to the first serving cell CC0 to the user equipment 1004. The specific reference signal, the transmission mode of the CC0 is the non-CoMP mode, that is, the single-point transmission mode; the transmission mode of the second serving cell CC1 is the CoMP mode, and the first network-side device 1001 configures two CSI processes for the CC1; The transmission mode of the cell CC2 is the CoMP mode, and the second network side device 1002 configures two CSI processes for the CC2.

The serving cell in the non-CoMP mode corresponds to a CSI process, and each subframe in the CSI process carries a reference signal, and each subframe needs to calculate CSI, and then each subframe in the CSI Process corresponding to the serving cell in the non-CoMP mode is determined to be a valid sub-frame. a frame in which the reference signal can be a non-CoMP mode serving cell specific reference letter number. The priority of the CSI process corresponding to the serving cell in the non-CoMP mode is higher than the priority of the CSI process corresponding to the serving cell in the CoMP mode. As shown in FIG. 5, the user equipment 1004 may determine that the subframes 0 to 19 are valid subframes, and the reference signal carried by the valid subframe may be referred to the gray portion corresponding to CC0 in FIG.

The first network side device 1001 configures two CSI processes for the serving cell CC1 in the CoMP mode, and then configures one CSI-RS1 and one CSI-IM1 for the CSI Process1, and the user equipment 1004 can determine that the effective subframe includes the subframes 4 and 10. 14 and 19, wherein the reference signal carried by the valid subframe can be referred to the gray portion corresponding to CSI Process 1 of CC1 in FIG. 5. The first network side device 1001 configures a CSI-RS2 and a CSI-IM2 for the CSI Process2, and the user equipment 1004 can determine that the effective subframe includes the subframes 4, 10, 14, and 19, wherein the reference signal carried by the valid subframe can be referred to The gray portion corresponding to CSI Process 2 of CC1 in FIG.

The second network side device 1002 configures two CSI processes for the serving cell CC2 in the CoMP mode, and then configures one CSI-RS1 and one CSI-IM1 for the CSI Process1, and the user equipment 1004 can determine that the effective subframe includes the subframes 2 and 7. 12 and 17, wherein the reference signal carried by the valid subframe can be referred to the gray portion corresponding to CSI Process 1 of CC2 in FIG. 5. The second network side device 1002 configures a CSI-RS2 and a CSI-IM2 for the CSI Process2, and the user equipment 1004 can determine that the effective subframe includes the subframes 4, 10, 14, and 19, wherein the reference signal carried by the valid subframe can be referred to The gray portion corresponding to CSI Process 2 of CC2 in FIG.

The user equipment 1004 may determine whether the number of CSI processes corresponding to the current CSI to be calculated is greater than a preset number threshold. If the determination result is yes, the CSI Process corresponding to the lower priority is calculated in the specified subframe after the current valid subframe. CSI.

As shown in FIG. 5, when the preset number threshold is 2, the CSI process corresponding to the CSI to be calculated in the subframe 1 includes the CSI process of the CC0, and the number of CSIs to be calculated in the subframe 1 is 1, which is less than the preset threshold. The user equipment 1004 can calculate the corresponding CSI according to the reference signal carried in the subframe 1.

The CSI process corresponding to the CSI currently to be calculated in subframe 4 includes the CSI Process of CC0, the CSI Process1 of CC1, the CSI Process2 of CC1, and the CSI Process2 of CC2. Wherein, the transmission mode of CC0 is a non-CoMP mode, and the user equipment 1004 may determine that the CSI process of CC0 has a higher priority than other CSI processes. The user equipment 1004 may determine the priority of each CSI Process according to the priority of the process number of each CSI process, where the priority of CSI Process1 of CC1 is higher than the CSI Process2 of CC1 and the CSI Process2 of CC2, and the priority of CSI Process1 of CC2. CSI Process2 above CC1 and CSI Process2 of CC2. Further, the user equipment 1004 may acquire the priority of the CSI Process having the same priority of the process number according to the priority of the serving cell number of the serving cell. For example, the user equipment 1004 can be edited according to the serving cell. The priority of the number determines that the CSI Process1 of CC1 has a higher priority than the CSI Process1 of CC2, and the CSI Process2 of CC1 has a higher priority than the CSI Process2 of CC2. The CSI Process is sorted from high to low according to priority: CSI Process of CC0, CSI Process of CC1, CSI Process of CC2, CSI Process2 of CC1, and CSI Process2 of CC2.

After the user equipment 1004 determines that the number of CSI processes corresponding to the current CSI is greater than the preset number threshold, the CSI corresponding to the preset number threshold and the higher priority CSI Process may be calculated in the current valid subframe, and is currently The specified subframe after the valid subframe calculates the CSI corresponding to the other CSI Process.

For example, when the preset number threshold is 2, the CSI process corresponding to the CSI currently to be calculated in the subframe 4 includes the CSI Process of CC0, the CSI Process1 of CC1, the CSI Process2 of CC1, and the CSI Process2 of CC2, and the user equipment 1004 may be in the subframe. 4 Calculating the CSI corresponding to the CSI Process of CC0, and the CSI corresponding to CSI Process1 of CC1, and calculating the CSI corresponding to CSI Process2 of CC1 and the CSI corresponding to CSI Process2 of CC2 in subsequent subframes. The CSI Process corresponding to the CSI currently to be calculated in the subframe 5 includes the CSI Process of CC0, the CSI Process 2 of CC1, and the CSI Process 2 of CC2. The user equipment 1004 may calculate the CSI corresponding to the CSI Process of CC0 in subframe 5, and the CSI Process 2 of CC1. Corresponding CSI, and calculating the CSI corresponding to CSI Process2 of CC2 in subsequent subframes. The CSI Process corresponding to the CSI currently to be calculated in the subframe 6 includes the CSI Process of the CC0 and the CSI Process 2 of the CC2, and the user equipment 1004 may calculate the CSI corresponding to the CSI Process of the CC0 and the CSI corresponding to the CSI Process 2 of the CC2 in the subframe 6.

In the prior art, the user equipment 1004 needs to calculate the CSI corresponding to the four CSI processes in the subframe 4, the CSI corresponding to one CSI process in the subframe 5, and the CSI corresponding to the two CSI processes in the subframe 6. In the embodiment of the present invention, the user equipment 1004 can calculate the CSI corresponding to at most two CSI processes in each subframe by determining the effective subframe and adopting the time division multiplexing, which can effectively reduce the computational complexity of the CSI.

In the communication system shown in FIG. 8, the network side device 801 sends a plurality of reference signals respectively configured for the multiple CSI processes to the user equipment 804, and the user equipment 804 separately receives multiple reference signals according to preset time intervals and preset rules. The user equipment 804 determines the CSI corresponding to each of the multiple CSI processes according to the reference signals transmitted in the effective subframes of the plurality of reference signals, and the user equipment 804 is multiple. The corresponding CSI feedback of the CSI Process to the network side device can reduce the computational complexity of the channel state information and reduce the hardware cost.

In the description of the present specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" and the like means a specific feature described in connection with the embodiment or example. Knot A structure, material or feature is included in at least one embodiment or example of the invention. In the present specification, the schematic representation of the above terms is not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in a suitable manner in any one or more embodiments or examples. In addition, various embodiments or examples described in the specification, as well as features of various embodiments or examples, may be combined and combined.

Moreover, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, features defining "first" or "second" may include at least one of the features, either explicitly or implicitly. In the description of the present invention, the meaning of "a plurality" is at least two, such as two, three, etc., unless specifically defined otherwise.

Any process or method description in the flowcharts or otherwise described herein may be understood to represent a module, segment or portion of code comprising one or more executable instructions for implementing the steps of a particular logical function or process. And the scope of the preferred embodiments of the invention includes additional implementations, in which the functions may be performed in a substantially simultaneous manner or in the reverse order, depending on the order in which they are illustrated, which should be It will be understood by those skilled in the art to which the embodiments of the present invention pertain.

The logic and/or steps represented in the flowchart or otherwise described herein, for example, a list of programs that can be considered as executable instructions for implementing logical functions, can be embodied in any computer readable medium, Used by, or in conjunction with, an instruction execution system, apparatus, or device (such as a computer-based system, a system including a processor, or other system that can fetch instructions and execute instructions from an instruction execution system, apparatus, or device) Used for equipment. For the purposes of this specification, a "computer-readable medium" can be any apparatus that can contain, store, communicate, propagate, or transport a program for use in an instruction execution system, apparatus, or device, or in conjunction with the instruction execution system, apparatus, or device. More specific examples (non-exhaustive list) of computer readable media include the following: electrical connections (electronic devices) having one or more wires, portable computer disk cartridges (magnetic devices), random access memory (RAM), Read only memory (ROM), erasable editable read only memory (EPROM or flash memory), fiber optic devices, and portable compact disk read only memory (CDROM). In addition, the computer readable medium may even be a paper or other suitable medium on which the program can be printed, as it may be optically scanned, for example by paper or other medium, followed by editing, interpretation or, if appropriate, other suitable The method is processed to obtain the program electronically and then stored in computer memory.

It should be understood that portions of the invention may be implemented in hardware, software, firmware or a combination thereof. In the above embodiments, multiple steps or methods may be implemented in a memory that is stored in memory and executed by a suitable instruction execution system. Piece or firmware to achieve. For example, if implemented in hardware, as in another embodiment, it can be implemented by any one or combination of the following techniques well known in the art: having logic gates for implementing logic functions on data signals. Discrete logic circuits, application specific integrated circuits with suitable combinational logic gates, programmable gate arrays (PGAs), field programmable gate arrays (FPGAs), etc.

One of ordinary skill in the art can understand that all or part of the steps carried by the method of implementing the above embodiments can be completed by a program to instruct related hardware, and the program can be stored in a computer readable storage medium. When executed, one or a combination of the steps of the method embodiments is included.

In addition, each functional unit in each embodiment of the present invention may be integrated into one processing module, or each unit may exist physically separately, or two or more units may be integrated into one module. The above integrated modules can be implemented in the form of hardware or in the form of software functional modules. The integrated modules, if implemented in the form of software functional modules and sold or used as stand-alone products, may also be stored in a computer readable storage medium.

The above mentioned storage medium may be a read only memory, a magnetic disk or an optical disk or the like. Although the embodiments of the present invention have been shown and described, it is understood that the above-described embodiments are illustrative and are not to be construed as limiting the scope of the invention. The embodiments are subject to variations, modifications, substitutions and variations.

Claims (21)

1. A method for reporting channel state information, comprising:

   Receiving, by the network side device, a plurality of reference signals respectively configured by a plurality of channel state information processes (CSI processes), wherein the plurality of reference signals are in one-to-one correspondence with the plurality of CSI processes, wherein each of the reference signals includes periodically sending Channel state information pilot (CSI-RS) and channel state information interference measurement (CSI-IM), and each subframe referenced by the reference signal is a target subframe, and the signal transmitted in any target subframe is At least one of the CSI-RS and the CSI-IM;

   Determining, according to a preset time interval and a preset rule, a valid subframe from a target subframe respectively occupied by the plurality of reference signals, where between two adjacent valid subframes corresponding to any reference signal The time interval is not less than the preset time interval;

   Calculating channel state information (CSI) corresponding to each of the multiple CSI processes according to the reference signals transmitted in the effective subframes of the plurality of reference signals respectively;

   And feeding the corresponding CSIs of the multiple CSI processes to the network side device.
2. The method of claim 1 wherein said predetermined rules comprise:

   When the periods of the CSI-RS and the CSI-IM in the reference signal are the same and the offsets are the same, determining that the first target subframe corresponding to the reference signal is the first valid subframe, and in the reference signal Determining, in the target subframe after the n-1th valid subframe, a target subframe with a minimum time interval from the (n-1)th effective subframe and not less than the preset time interval Is the nth valid subframe; or

   Obtaining a first period corresponding to the reference signal when a period of the CSI-RS and the CSI-IM in the reference signal is different, or a period of the CSI-RS and the CSI-IM in the reference signal is the same but the offset is different Transmitting a target subframe of the CSI-RS, and a target subframe of the first transmission CSI-IM corresponding to the reference signal;

   Determining, if the target subframe of the first transmission CSI-RS is located before the target subframe of the first transmission CSI-IM, determining that the target subframe of the first transmission CSI-IM is the first valid subframe;

   If the target subframe of the first transmission CSI-RS is located after the target subframe of the first transmission CSI-IM, determining that the target subframe of the first transmission CSI-RS is the first valid subframe;

   Determining, in a target subframe after the n-1th valid subframe corresponding to the reference signal, a time interval between the n-1th valid subframe and a minimum time interval of not less than the preset time interval One target subframe is the nth valid subframe;

   Where n is a positive integer greater than one.
3. The method according to claim 1 or 2, wherein the reference target subframes belong to the first CSI set and the second CSI set respectively;

   The calculating the CSI corresponding to each of the multiple CSI processes according to the reference signals transmitted in the effective subframes of the plurality of reference signals respectively includes:

   Determining whether the CSI calculated according to the reference signal transmitted by the previous valid subframe of the current valid subframe belongs to the first CSI set or the second CSI set, when the reference signal corresponds to the untransmitted CSI-IM in the currently valid subframe. And calculating, according to the reference signal transmitted in the currently valid subframe, a CSI of a CSI set different from a CSI set to which the previous CSI belongs;

   Calculating CSI of the CSI set to which the current valid subframe belongs according to the reference signal transmitted in the currently valid subframe corresponding to the reference signal, when the CSI-IM is transmitted in the currently valid subframe. .
4. The method according to any one of claims 1 to 3, wherein the calculating the CSI corresponding to each of the plurality of CSI processes according to the reference signals transmitted in the respective valid subframes of the plurality of reference signals respectively Previously, it also included:

   Determining whether the number of CSIs to be calculated is greater than a preset number threshold;

   When the determination result is yes, determining, in the CSI Process corresponding to the multiple CSIs, a target CSI Process that meets the preset number threshold;

   Calculating a corresponding CSI according to the reference signals transmitted in the valid subframes of the target CSI processes;

   Calculating a corresponding CSI in a specified target subframe after the valid subframe according to a reference signal transmitted in a valid subframe in another CSI process corresponding to the multiple CSIs;

   When the result of the determination is no, the CSI corresponding to the CSI is corresponding to the reference signal transmitted in the valid subframe, and the corresponding CSI is calculated.
5. The method according to claim 4, wherein the determining, in the CSI Process corresponding to the plurality of CSIs, a target CSI process that satisfies the preset number threshold comprises:

   Determining, according to a priority of a process number of a CSI process corresponding to each of the plurality of CSIs, a target CSI Process that satisfies the preset number threshold.
6. The method according to claim 4, wherein the determining, in the CSI Process corresponding to the plurality of CSIs, a target CSI process that satisfies the preset number threshold comprises:

   Determining a target that satisfies the preset number threshold according to a priority of a process number of a CSI process corresponding to each of the multiple CSIs, and a priority of a serving cell number of the serving cell corresponding to the CSI process having the same priority of the process number CSI Process.
7. The method according to any one of claims 4 to 6, wherein the determining, in the CSI Process corresponding to the plurality of CSIs, that the target CSI process that meets the preset number threshold is:

   When detecting that the CSI processes corresponding to the multiple CSIs include the CSI Process of the serving cell in the single-point transmission mode, determining that the CSI process of the serving cell of the single-point transmission mode has the highest priority.
8. The method according to claim 7, wherein any target subframe corresponding to the CSI Process of the serving cell in the single-point transmission mode is a valid subframe, and the reference signal transmitted in any one of the target subframes is The cell-specific reference signal of the single-point transmission mode.
9. The method according to any one of claims 4 to 7, wherein the other CSI processes corresponding to the CSI processes corresponding to the plurality of CSIs respectively correspond to reference signals transmitted in valid subframes, in the valid sub- Before the specified target subframe after the frame is calculated by the corresponding CSI, it also includes:

   Determining that the number of CSIs to be calculated in the specified target subframe is not greater than the preset number threshold.
10. The method according to any one of claims 1 to 9, wherein the calculating the CSI corresponding to each of the plurality of CSI processes according to the reference signals transmitted in the respective valid subframes of the plurality of reference signals respectively include:

    When the reference signal transmitted in the valid subframe corresponding to the reference signal includes a CSI-RS and a CSI-IM, calculating a corresponding CSI according to the CSI-RS and the CSI-IM transmitted in the valid subframe;

    When the reference signal transmitted in the valid subframe corresponding to the reference signal includes a CSI-RS, calculating a corresponding CSI according to the CSI-RS transmitted in the valid subframe and the CSI-IM transmitted recently before the valid subframe. ;

    When the reference signal transmitted in the valid subframe corresponding to the reference signal includes CSI-IM, according to the valid actor The corresponding CSI is calculated by the CSI-IM transmitted in the frame and the CSI-RS transmitted recently before the valid subframe.
11. A user equipment, comprising:

    a receiving unit, configured to receive multiple reference signals respectively configured by the network side device for multiple CSI processes, where the multiple reference signals are in one-to-one correspondence with the multiple CSI processes, where each reference signal includes a periodic transmission CSI-RS and CSI-IM, and each subframe referenced by the reference signal is a target subframe, and the signal transmitted in any target subframe is at least one of the CSI-RS and the CSI-IM ;

    a determining unit, configured to determine, according to a preset time interval and a preset rule, a valid subframe from a target subframe occupied by each of the multiple reference signals, where two adjacent neighbors corresponding to any reference signal are valid The time interval between the subframes is not less than the preset time interval;

    a calculating unit, configured to calculate a CSI corresponding to each of the multiple CSI processes according to a reference signal transmitted in each of the plurality of reference signals respectively corresponding to the effective subframe;

    a feedback unit, configured to feed back the CSI corresponding to the multiple CSI processes to the network side device.
12. The user equipment of claim 11, wherein the preset rule comprises:

    When the periods of the CSI-RS and the CSI-IM in the reference signal are the same and the offsets are the same, determining that the first target subframe corresponding to the reference signal is the first valid subframe, and in the reference signal Determining, in the target subframe after the n-1th valid subframe, a target subframe with a minimum time interval from the (n-1)th effective subframe and not less than the preset time interval Is the nth valid subframe; or

    Obtaining a first period corresponding to the reference signal when a period of the CSI-RS and the CSI-IM in the reference signal is different, or a period of the CSI-RS and the CSI-IM in the reference signal is the same but the offset is different Transmitting a target subframe of the CSI-RS, and a target subframe of the first transmission CSI-IM corresponding to the reference signal;

    If the target subframe of the first transmission CSI-RS is located before the target subframe of the first transmission CSI-IM, determining that the target subframe of the first transmission CSI-IM is the initial effective subframe;

    If the target subframe of the first transmission CSI-RS is located after the target subframe of the first transmission CSI-IM, determining that the target subframe of the first transmission CSI-RS is the initial effective subframe;

    Determining, in a target subframe after the n-1th valid subframe corresponding to the reference signal, a time interval between the n-1th valid subframe and a minimum time interval of not less than the preset time interval One target subframe is the nth valid subframe;

    Where n is a positive integer greater than one.
13. The user equipment according to claim 11 or 12, wherein the any reference signal corresponding to the target subframe belongs to the first CSI set and the second CSI set respectively;

    The calculating unit is configured to: when the reference signal corresponds to a CSI-IM that is not transmitted in the current valid subframe, determine that the CSI calculated according to the reference signal transmitted by the previous valid subframe of the current valid subframe belongs to the first The CSI set is also the second CSI set, and calculates CSI of the CSI set different from the CSI set to which the previous CSI belongs according to the reference signal transmitted in the current valid subframe;

    The calculating unit is further configured to: when the CSI-IM is transmitted in the currently valid subframe corresponding to the reference signal, calculate the current valid according to the reference signal transmitted in the currently valid subframe corresponding to the reference signal The CSI of the CSI set to which the subframe belongs.
14. The user equipment according to any one of claims 11 to 13, further comprising:

    a determining unit, configured to determine, according to the reference signals transmitted in the valid subframes of the plurality of reference signals, respectively, before calculating the CSI corresponding to each of the multiple CSI processes, determining whether the number of CSIs to be calculated currently is Greater than a preset number threshold;

    The determining unit is further configured to: when the determining unit determines that the result is YES, determine, in the CSI Process corresponding to the multiple CSIs, a target CSI Process that meets the preset number threshold;

    The calculating unit is further configured to calculate a corresponding CSI according to the reference signal transmitted in the corresponding valid subframe of the target CSI process, and corresponding to the valid subframe according to the other CSI processes in the CSI process corresponding to the multiple CSIs a reference signal transmitted in the medium, and calculating a corresponding CSI in the specified target subframe after the valid subframe;

    The calculating unit is further configured to: when the determining unit determines that the result is no, calculate a corresponding CSI according to the reference signals transmitted in the valid subframes corresponding to the CSI processes corresponding to the CSI.
15. The user equipment of claim 14 wherein:

    The determining unit is configured to determine, according to a priority of a process number of the CSI process corresponding to each of the multiple CSIs, a target CSI Process that meets the preset number threshold.
16. The user equipment of claim 14 wherein:

    The determining unit is configured to determine, according to the priority of the process number of the CSI process corresponding to the multiple CSIs, and the priority of the serving cell number of the serving cell corresponding to the CSI process with the same priority of the process number, The target CSI Process of the preset number threshold.
17. A user equipment according to any one of claims 14 to 16, wherein

    The determining unit is configured to determine that the CSI Process of the serving cell of the single-point transmission mode has the highest priority when detecting that the CSI process corresponding to the multiple CSIs includes a CSI process of a serving cell in a single-point transmission mode.
18. The user equipment according to claim 17, wherein any target subframe corresponding to the CSI Process of the serving cell in the single-point transmission mode is a valid subframe, and the reference signal transmitted in any of the target subframes A cell-specific reference signal for the single-point transmission mode.
19. A user equipment according to any one of claims 14 to 17, wherein

    The determining unit is further configured to determine, according to the reference signal transmitted in the corresponding valid subframe of each of the other CSI processes, before calculating the corresponding CSI in the specified subframe after the valid subframe, The number of CSIs to be calculated in the specified target subframe is not greater than the preset number threshold.
20. A user equipment according to any one of claims 11 to 19, characterized in that

    The calculating unit is configured to calculate, according to the CSI-RS and the CSI-IM transmitted in the valid subframe, when the reference signal transmitted in the valid subframe corresponding to the reference signal includes a CSI-RS and a CSI-IM, CSI;

    The calculating unit is further configured to: when the reference signal transmitted in the valid subframe corresponding to the reference signal includes a CSI-RS, according to the CSI-RS transmitted in the valid subframe and the most recently transmitted before the valid subframe CSI-IM, calculating the corresponding CSI;

    The calculating unit is further configured to: when the reference signal transmitted in the valid subframe corresponding to the reference signal includes a CSI-IM, according to the CSI-IM transmitted in the valid subframe and the most recently transmitted before the valid subframe CSI-RS, calculates the corresponding CSI.
21. A communication system, comprising: a network side device and the user equipment according to any one of claims 14 to 20, wherein:

    The network side device is configured to send, to the user equipment, multiple reference signals respectively configured for multiple CSI processes, so that the user equipment calculates and feeds back the multiple CSI processes according to the multiple reference signals. Corresponding CSI.

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