WO2014008779A1 - 上报信道状态信息的方法和装置 - Google Patents

上报信道状态信息的方法和装置 Download PDF

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Publication number
WO2014008779A1
WO2014008779A1 PCT/CN2013/075128 CN2013075128W WO2014008779A1 WO 2014008779 A1 WO2014008779 A1 WO 2014008779A1 CN 2013075128 W CN2013075128 W CN 2013075128W WO 2014008779 A1 WO2014008779 A1 WO 2014008779A1
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Prior art keywords
rss
information
subset
network device
sets
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PCT/CN2013/075128
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English (en)
French (fr)
Inventor
周明宇
任晓涛
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华为技术有限公司
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Publication of WO2014008779A1 publication Critical patent/WO2014008779A1/zh

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0023—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the signalling
    • H04L1/0026—Transmission of channel quality indication
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0001—Arrangements for dividing the transmission path
    • H04L5/0014—Three-dimensional division
    • H04L5/0023—Time-frequency-space
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0053—Allocation of signaling, i.e. of overhead other than pilot signals
    • H04L5/0057—Physical resource allocation for CQI

Definitions

  • the present invention relates to the field of communications, and more particularly to a method and apparatus for using a downlink reference signal.
  • the network device transmits data to the user equipment (User Equipment, UE) in a frequency band with good channel conditions, the transmission efficiency and reliability can be improved. Therefore, in order to perform reasonable frequency domain scheduling, the network device usually sends a downlink reference signal (Reference Signal, RS) to the UE, such as channel state information in a Long Term Evolution-Advanced (LTE-A) system.
  • Reference Signal Channel State Information-Reference Signal, CSI-RS
  • the UE After receiving the downlink RS, the UE will measure the received downlink RS and report the downlink CSI to the network device.
  • the network device can configure the resource density of the downlink RS by sending a signal to the UE during system design.
  • the network device may send signaling to the UE to configure a CSI-RS transmission period, and the minimum CSI-RS transmission period is 5 transmission time intervals (Transmission Time Interval, ⁇ ), specifically
  • the network device and the UE are pre-configured with a plurality of CSI-RS transmission period configurations, and the network device sends the number of the configuration to the UE, and the UE may query the CSI-RS transmission period configuration table according to the number to obtain the CSI determined by the network device. Configuration of the RS transmission period.
  • a single node serving the UE is usually the node with the best channel condition among all nodes, so the above solution is the resource density of the downlink RS.
  • the designed minimum value can satisfy the measurement accuracy of the downlink CSI corresponding to a single node in this case.
  • the CSI-RS can be transmitted using a minimum transmission period of 5 ⁇ . Guarantee measurement accuracy.
  • CoMP Coordinated Multiple Point Transmission/Reception
  • the channel conditions of some of the nodes are generally poor.
  • the minimum value of the transmission period of the CSI-RS cannot meet the measurement accuracy of the downlink CSI corresponding to the nodes.
  • Node 1 and Node 2 simultaneously serve UE1, the channel condition of Node 1 is better, and the channel condition of Node 2 is poor.
  • the minimum transmission period is 5 ⁇ .
  • the design can satisfy UE to Node 1.
  • the measurement accuracy of the corresponding downlink CSI cannot satisfy the measurement accuracy of the downlink CSI corresponding to the node 2.
  • the present invention provides a method for reporting channel state information, a user equipment, and a network device to enhance measurement accuracy of downlink CSI.
  • the first aspect provides a method for reporting channel state information, where the method includes: receiving, by a user equipment UE, a plurality of sets of reference signals RS sent by a network device;
  • the combined downlink CSI is reported to the network device.
  • a second aspect provides a method for reporting channel state information, the method comprising: the network device transmitting a plurality of sets of reference signals RS to a user equipment UE;
  • a user equipment where the user equipment includes:
  • a receiving module configured to receive multiple sets of reference signals RS sent by the network device, and transmit the multiple sets of RSs to the acquiring module;
  • the acquiring module is configured to measure the multiple groups of RSs that are sent by the receiving module, obtain measurement results of the groups of RSs, and obtain the combined downlink channels of the multiple groups of RSs according to the measurement results of the groups of RSs.
  • the sending module is configured to report the combined downlink CSI transmitted by the acquiring module to the network device.
  • a network device where the network device includes:
  • a sending module configured to send, to the user equipment UE, multiple sets of reference signals RS;
  • a receiving module configured to receive joint downlink channel state information CSI reported by the UE to the network device, where the joint downlink CSI is measured by the UE according to the multiple groups of RSs The measured result is obtained by the combined downlink CSI of the plurality of sets of RSs.
  • the foregoing method for reporting the channel state information, the user equipment, and the network device may enable the UE to measure the downlink CSI of the multiple groups of RSs by measuring the multiple sets of RSs sent by the network device, and obtaining the downlink CSI of the multiple groups of RSs according to the measurement results of the multiple groups of RSs, thereby enhancing the downlink CSI. measurement accuracy.
  • FIG. 1 is a schematic flowchart of a method for reporting channel state information according to an embodiment of the present invention
  • FIG. 2 is a schematic diagram of a plurality of groups of RSs sent by a network device according to an embodiment of the present invention in a physical resource block (PRB); Schematic diagram of the occupied resource unit (Resource Element, RE);
  • FIG. 3 is a schematic diagram of REs occupied by multiple sets of RSs in a PRB sent by a network device according to an embodiment of the present invention
  • FIG. 4 is a schematic flowchart of another method for reporting channel state information according to an embodiment of the present invention
  • FIG. 5 is a schematic diagram of multiple cells sending signals to a UE according to an embodiment of the present invention
  • FIG. 6 is a schematic diagram of a transmission time interval ( ⁇ ) relationship of a network device for transmitting multiple sets of RSs according to an embodiment of the present invention
  • FIG. 7 is a schematic structural diagram of a user equipment according to an embodiment of the present invention.
  • FIG. 8 is a schematic structural diagram of a network device according to an embodiment of the present invention.
  • FIG. 9 is a schematic structural diagram of another network device according to an embodiment of the present invention. detailed description
  • one lms is lms, including 14 symbols; the system bandwidth includes a plurality of physical resource blocks (PRBs), and the bandwidth of one PRB includes 12 subcarriers and one resource unit ( The Resource Element , RE ) occupies one subcarrier in the frequency domain and occupies one symbol length in the time domain.
  • the network device can send the RS in each PRB. After receiving the RS, the UE obtains the downlink CSI by measuring the received RS, and feeds the obtained downlink CSI to the network device.
  • the network device periodically sends a downlink RS for measuring downlink CSI to the UE, for example, the transmission period is 5 TTIs, and the time offset is 0 ⁇ , so that the UE is numbered 0, 5, 10.
  • the downlink RS is measured on the top of hardly to obtain the downlink CSI.
  • one solution of the prior art is to increase the resource density of the downlink RS, for example, to send the downlink RS with 2 ⁇ as the transmission period.
  • the method of increasing the resource density of the downlink RS has the disadvantage that both the network device and the UE are required to increase the new resource density, for example, sending the downlink RS in a smaller transmission period, or using more frequency resources.
  • the CSI-RS transmission period configuration option may be added on the basis of the LTE-A existing CSI-RS transmission period configuration table, so that the network device sends signaling to the UE, and corresponds to a smaller transmission period (for example, a transmission period).
  • the UE is notified of the transmission period configuration of the CSI-RS for the second ⁇ ), so that the UE detects the CSI-RS according to the smaller transmission period, which requires the UE and the network device to perform corresponding modification.
  • the embodiment of the present invention proposes that the network device sends multiple sets of RSs to the UE, so that the UE measures multiple sets of RSs, and according to the measurement of multiple sets of RSs. The result is a more accurate combined downlink CSI for multiple sets of RSs.
  • an embodiment of the present invention does not need to add a resource density option in the CSI-RS transmission period configuration table of the network device and the UE, so that the device has better compatibility.
  • an embodiment of the present invention provides a method for reporting channel state information. As shown in FIG. 1, the method includes the following steps.
  • Step 101 The network device sends multiple groups of RSs to the UE.
  • multiple groups of RSs may be multiple groups of RSs having different attributes.
  • a group of RSs may include an RS corresponding to at least one antenna port (hereinafter referred to as an RS).
  • the same group of RSs refers to one or more RSs of the same signaling configuration, and different groups of RSs are configured by different signaling, and therefore, the attributes of the same group of RSs are the same.
  • the network device sends a signaling to the UE, and the UE can learn the information of all the RSs configured by using the same signaling through the signaling, so that the group RS can be received.
  • the network device sends the RE information of one of the RSs to the UE, and the UE can learn, by using the information, an example in which all the RSs in the group of RSs correspond to each other.
  • the attributes may include: the sending period of the RS, the same sending. One or more of the time offset within the period, and the RE corresponding to the RS.
  • the multiple sets of RSs are multiple sets of RSs of one or any combination of the following: multiple sets of RSs with different transmission periods, multiple sets of RSs with different time offsets in the same transmission period, and multiple sets of RSs corresponding to different REs.
  • the different REs herein may be REs having different subcarrier numbers and/or symbol numbers for transmitting RSs in one cell.
  • the transmission period of the first group RS is 5 TTIs, and the transmission period of the second group RS is 10 ⁇ ;
  • the transmission periods of the first and second sets of RSs are all five, but the time offsets of the first and second sets of RS are 0 and 2, respectively. ;
  • the REs corresponding to the first and second sets of RSs are as shown in FIG. 2, that is, in one PRB, the RE corresponding to the first set of RSs is (5, 9) and (6,9), the RE corresponding to the second group RS is (5,3) And 6, 3), wherein the RE can represent its symbol number and subcarrier number by t, k), t denotes the symbol number corresponding to the RE in one frame, and k denotes the subcarrier number corresponding to the RE on one PRB.
  • the two sets of RSs are combinations of any of the above three examples.
  • the transmission periods of the two sets of RSs are different and correspond to different REs, and are not described herein again.
  • the attributes may also include: a category of the RS. Therefore, in this example, the plurality of sets of RSs may be RSs of different categories, wherein the categories include Common Reference Signals (CRS) and CSI-RSs.
  • CRS Common Reference Signals
  • CSI-RSs CSI-RSs
  • the RS includes CRS and CSI-RS, where CRS can be sent at each port, but can only be sent through at most 4 antenna ports numbered 0 ⁇ 3; the minimum transmission period of CSI-RS can be 5 ⁇ , It can be sent through up to 8 antenna ports numbered 15 ⁇ 22.
  • the channel for transmitting the CRS and the CSI-RS is the same, so The CRS and the CSI-RS are measured to obtain respective measurement results, and the combined downlink CSI of the CRS and the CSI-RS is obtained according to the measurement results of the CRS and the CSI-RS, thereby improving the measurement accuracy.
  • the network device sends the first group CRS and the second group CSI-RS to the UE through the same physical antenna, wherein the first group CRS corresponds to the CRS whose antenna port number is 0 ⁇ 3, and the sending period is one ⁇ , the first The two groups of CSI-RSs correspond to CSI-RSs with antenna ports numbered 15 to 18, and the transmission period is 5 TTIs; the two sets of RSs correspond to different REs, as shown in FIG. 3; the UE receives the corresponding group 1 CRSs.
  • the RE can measure the first group CRS, and the CRS measurement results corresponding to the antenna ports 0 ⁇ 3 can be obtained.
  • the antenna can be obtained.
  • the first group CRS and the second group CSI-RS correspond to the same number of antenna ports (eg, four antenna ports), and are network devices that are sent through the same physical antenna (for example, four physical antennas). Then, the channels corresponding to the two sets of RSs are the same, and then the more accurate joint downlink CSI can be obtained according to the measurement results of the first group CRS and the second group CSI-RS.
  • the physical antenna corresponds to the actual antenna
  • the antenna port is the virtualized antenna that the UE can distinguish.
  • an actual network device includes four physical antennas, if the four physical antennas transmit the same signal (ie, input one way)
  • the signal, which is copied to 4 physical antennas, is equivalent to 1 signal multiplied by a 4x1 matrix), for the UE, only 1 antenna port can be distinguished, ie 4 physical antennas are virtualized into one Antenna port; if the network device will be 4 Different signals are sent through 4 physical antennas, and the UE can distinguish 4 signals, then 4 physical antennas are virtualized into 4 antenna ports.
  • the network device may send the RS through the same physical antenna.
  • the network device may use the same physical antenna.
  • the CRS corresponding to the antenna port numbered 0 to 3 and the CSI-RS corresponding to the antenna port numbered 15 to 18 are transmitted, so that the CRS and the CSI-RS correspond to the same channel fading, and the embodiment of the present invention can be used to measure more. More RS to enhance measurement accuracy.
  • the network device may send a set of RSs through at least one antenna port, and notify the UE of the RE information of the RS or the RS by signaling. For example, the network device sends a RE number corresponding to the RS to the UE, and notifies the UE that the RS group corresponds to two antenna ports. After receiving the UE, the UE determines the RE corresponding to the RS of the two antenna ports according to the number.
  • the multiple groups of RSs may also belong to the first subset, where the first subset belongs to one set, and the set includes at least two subsets.
  • the set All sets except the first subset are referred to as a second subset.
  • the network device further sends one or more groups of RSs of the second subset to the UE.
  • the network device may also not send one or more groups of RSs of the second subset sent to the UE in this step, but separately send multiple groups of RSs corresponding to each subset.
  • the UE may obtain the downlink CSI corresponding to the second subset according to the measurement result of the group or groups of RSs corresponding to the subset;
  • the second subset includes a set of RSs, and after receiving the set of RSs included in the second subset, the UE may obtain downlink CSIs of the second set of RSs according to the second subset;
  • the second subset includes multiple sets of RSs. After receiving the multiple sets of RSs included in the second subset, the UE may obtain the combined downlink CSIs of the multiple sets of RSs corresponding to the second subset according to the second subset.
  • the UE may divide the received multiple sets of RS into multiple subsets, so that different subsets may correspond to different features, such as cells.
  • the network device sends six sets of RSs to the UE, where the first and third sets of RSs are the first subset, and the UE obtains the combined downlink CSI corresponding to the first subset according to the measurement results of the first and third sets of RSs;
  • the group RS is the second subset, the UE measures the fourth group RS to obtain the downlink CSI corresponding to the second subset;
  • the fifth group and the sixth group RS are the third subset, and the UE obtains the first according to the measurement results of the fifth and sixth groups of RSs.
  • the 3 subsets correspond to the combined downlink CSI.
  • the network device may further send the subset information of the multiple groups of RSs to the UE, so that the UE can determine each group according to the subset information sent by the network device.
  • the subset information may include one or more of a subset number, a correspondence relationship of one or more subsets and a plurality of sets of RSs, and the like.
  • the description of the "group” and the "subset” in the embodiment of the present invention does not necessarily require the network device or the UE to have the operation of "dividing the group” or “dividing the subset", but for the sake of clarity. description of.
  • RSs having different characteristics are treated as different subsets, and RS groups having the same feature are used as the same subset, wherein the features include a physical antenna that transmits the RS and/or an antenna corresponding to the RS. Port, etc.
  • RS groups transmitted by different physical antennas or RS groups mapped to different antenna ports or RS groups with other different characteristics are used as different subsets, and RS groups of the same feature are used as the same subset.
  • the first embodiment of the present invention may further include: the network device may send the information of the multiple groups of RSs to the UE in advance, so that the UE can receive the multiple groups of RSs according to the information of the multiple groups of RSs.
  • the information of the multiple groups of RSs may include one or more of a transmission period of the RS, RS sequence information, and a number of antenna ports corresponding to each group of RSs.
  • the network device may send the multiple sets of RSs to the UE by using different powers.
  • the first embodiment of the present invention may further include the following steps: the network device sends the power information corresponding to the multiple sets of RSs to the UE, The UE is configured to obtain a joint downlink CSI according to the power information and the measurement result.
  • the downlink CSI may include a rank indicator (RI), a precoding matrix indicator (PMI), a channel quality indicator (CQI), and a reference signal received power (reference Signal Received Power, RSRP), Reference Signal Received Quality (RSRQ), and one or more of the reception time offsets of multiple sets of RSs.
  • RI rank indicator
  • PMI precoding matrix indicator
  • CQI channel quality indicator
  • RSRP reference Signal Received Power
  • RSRQ Reference Signal Received Quality
  • the RI is used to indicate the number of spatial transmission layers recommended by the UE; the PMI is used to indicate a precoding matrix suitable for use by the network device suggested by the UE, and the CQI is used to indicate the modulation and coding scheme (MCS) recommended by the UE, and the RSRP is used.
  • the RSRQ is used to indicate the received quality corresponding to the downlink RS measured by the UE (that is, the noise interference received by the downlink RS).
  • the signal to Interference plus Noise Ratio (SINR) the reception time deviation refers to the difference between the reception times of the different groups of RSs received by the UE.
  • the UE detects the first group RS by detecting the first group RS.
  • the time to reach the UE is T1; by detecting the second group RS, it is known that the time when the second group RS arrives at the UE is T2, and the UE can report the reception time deviation of the multiple groups of RSs to the network device, as in the above example, the reception time deviation That is T2-T1.
  • the network device may be a base station (Base Station, BS), an access point (AP), a remote radio equipment (RRE), and a remote radio head (RRH). ), Remote Radio Unit (RRU), or Relay node.
  • the downlink CSI corresponding to the second subset is also received, where If the second subset corresponds to multiple sets of RSs, the downlink CSI corresponding to the second subset is the combined downlink CSI of the multiple sets of RSs corresponding to the second subset.
  • the first embodiment of the present invention may further include: for any one of the multiple groups of RSs, the network device sends the joint acquisition information corresponding to the group of RSs to the UE, where the joint acquisition information may be: The measurement result of a certain group of RSs is added to the obtained downlink CSI, or is a subset of a certain group of RSs, or whether the downlink CSIs of all the groups of RSs are obtained according to the measurement results of all the groups of RSs, so that the UE Determining, according to the joint acquisition information sent by the network device for each group of RSs, whether the measurement result of the group of RSs needs to be added to obtain the downlink CSI of the joint, or determining the subset of the group of RSs to obtain the downlink of the joint of the group.
  • the network device sends multiple sets of RSs to the UE, and receives the combined downlink CSI obtained by the UE according to the measurement result of the multiple sets of RSs, instead of receiving the downlink CSI obtained by the UE by measuring a group of RSs. , thus enhancing the measurement accuracy.
  • the embodiment of the present invention can also improve the measurement accuracy without increasing the resource density option of the network device. For example, the density of the CSI-RS does not need to be increased, the minimum density is still maintained once, and the prior art does not need to be changed. Configuration, therefore, has better compatibility with prior art designs.
  • another embodiment of the present invention further provides a method for reporting channel state information.
  • the method on the UE side corresponding to the embodiment of the foregoing network device may be referred to the description in the foregoing embodiment. As described in Figure 4, the method includes the following steps.
  • Step 401 The UE receives multiple groups of RSs sent by the network device.
  • multiple sets of RSs may be different RSs with different attributes.
  • a group of RSs can include at least one RS.
  • the attributes may include: one or more of a transmission period of the RS, a time offset within the same transmission period, and an RE corresponding to the RS.
  • the multiple sets of RSs are multiple sets of RSs of one or any combination of the following: multiple sets of RSs with different transmission periods, multiple sets of RSs with different time offsets in the same transmission period, and/or multiple corresponding REs. Group RS.
  • the attributes may also include: a category of the RS. Categories can include CRS and CSI-RS.
  • the second embodiment of the present invention may further include: the UE may receive the information of the multiple groups of RSs sent by the network device in advance; in step 401, the UE receives the multiple groups of RSs according to the information of the multiple groups of RSs.
  • the information of the multiple groups of RSs may include one or more of a transmission period of the RS, RS sequence information, and a number of antenna ports corresponding to each group of RSs.
  • Step 402 Measure a plurality of sets of RSs sent by the network device to obtain measurement results corresponding to each group of RSs, and obtain joint downlink CSIs of the plurality of sets of RSs according to the measurement results of the multiple sets of RSs.
  • the downlink CSI may include one or more of the RI, the PMI, the CQI, the RSRP, the RSRQ, and the receiving time offset of the multiple groups of RSs.
  • the functions of the foregoing various downlink CSIs may be as described in the first embodiment, where No longer.
  • the UE may measure different parameters of the sent multiple sets of RSs, so as to obtain the combined downlink CSI to be reported, for example, may measure the SINR of the RS, or CQI, and the like.
  • the embodiment of the present invention does not limit the method for measuring each group of RSs, and the methods for measuring RS in the prior art can be applied to the embodiments of the present invention.
  • the UE performs a convolution operation on the CSI-RS transmitted by the network device stored on the UE and the CSI-RS received by the UE to obtain CSI.
  • the CSI-RS is usually a sequence.
  • a PRB includes a RE
  • a 100-bit PRB corresponds to a CSI-RS sequence of length 100.
  • the specific measurement method belongs to the prior art and will not be described here.
  • the UE obtains a combined downlink CSI according to the measurement result of the multiple sets of RSs, so that a more accurate downlink CSI can be obtained.
  • the multiple groups of RSs may also belong to the first subset, where the first subset belongs to one set, and the set includes at least two children. In this application, all the sets in the set except the first subset are referred to as a second subset.
  • the UE further receives one or more groups of RSs of the second subset that the network device sends to the UE.
  • the UE may also not receive the one or more sets of RSs of the second subset sent by the network device in step 401, but receive the corresponding one of the second subsets before or after step 401.
  • the UE measures RSs of the second subset and obtains measurement results of each group of RSs corresponding to the second subset, and according to the The measurement results of each group of RSs of the second subset obtain the downlink CSI of the second subset.
  • the downlink CSI of the second subset is a joint downlink CSI
  • the downlink CSI of the second subset Is the downlink CSI of the set of RSs.
  • the description of "group” and “subset” in this embodiment does not necessarily require the operation of the network device or the UE to have a "divided group” or a “divided subset”, but for the sake of clarity. description of.
  • RSs having different characteristics are treated as different subsets, and RS groups having the same feature are used as the same subset, wherein the features include a physical antenna that transmits the RS and/or an antenna corresponding to the RS. Port, etc.
  • RS groups transmitted by different physical antennas or RS groups mapped to different antenna ports or RS groups having other different characteristics are used as different subsets, and RS groups of the same feature are used as the same subset.
  • RS groups of the same feature are used as the same subset.
  • the UE may further receive the subset information that is sent by the network device to the UE; at this time, the UE further determines, according to the subset information sent by the network device, all the RS groups and subsets. Corresponding relationship, so that the combined downlink CSI of each subset is obtained according to the measurement results of the multiple sets of RSs corresponding to the subset.
  • the network device sends the subset information to the UE as the number of subsets is 2, and sends 4 sets of RSs to the UE, that is, the 4 sets of RSs are divided into 2 subsets, and the UE can know according to the subset information:
  • the two groups of RSs correspond to the first subset, and the UE obtains the joint downlink CSI of the first subset according to the measurement results of the first and second groups of RSs;
  • the third and fourth groups of RSs correspond to the second subset, and the UE according to the third and fourth groups
  • the measurement results of the RS obtain the combined downlink CSI of the second subset.
  • the UE only needs to know the subset information.
  • the UE may classify the RS group into different subsets according to its own rules. For example, the UE may classify the RS group into different subsets according to the same rule that the number of RS groups included in all subsets is the same.
  • Step 403 The UE reports the obtained downlink CSI to the three or four hundred network devices. In this step, the UE may report the obtained downlink CSI to the network device at the reporting time, where the reporting time of the UE is configured by the network device. The specific report is prior art and will not be described here.
  • the UE receives the multiple sets of RSs sent by the network device, and reports the combined downlink CSI obtained according to the measurement result of the multiple sets of RSs to the network device, instead of reporting the downlink obtained by measuring a group of RSs.
  • CSI which enhances measurement accuracy.
  • the embodiment of the present invention can also improve the measurement accuracy without increasing the resource density option of the network device. For example, the density of the CSI-RS does not need to be increased, the minimum density is still maintained once, and the prior art does not need to be changed. Configuration, therefore, has better compatibility with prior art designs.
  • the CSI is used as an example of the RSRQ, and the embodiment of the present invention is further described.
  • the UE measures the SINR corresponding to each group of RSs, but it should be noted that the embodiment of the present invention is not limited to the case where the CSI is the RSRQ, and the other CSIs. The implementation is similar to RSRQ and will not be repeated here.
  • the network device transmits the first group RS on the TTI numbered 0, the second group RS on the TTI numbered 2, and the SINR measured by the UE for the first group and the second group RS are SINR0 and SINR2, respectively.
  • the reporting time is ⁇
  • the UE obtains the joint downlink CSI according to the measurement results SINR0 and SINR2 corresponding to the first group and the second group RS, for example, the UE obtains the combined downlink CSI according to (SINR0+SINR2)/2.
  • the UE sends the joint downlink CSI, which is (SINR0+SINR2) 12 in the example, to the network device.
  • the UE when the two sets of RSs are periodically transmitted, the UE periodically measures the two sets of RSs after receiving the two sets of RSs periodically sent by the network device to the UE, and according to the measurement results corresponding to the two sets of RSs. Obtain a periodic joint downlink CSI, and periodically report the acquired downlink CSI.
  • the UE when the network device periodically sends the multiple sets of RSs to the UE, the UE periodically reports the combined downlink CSI to the network device; Obtaining the combined downlink CSI of the multiple sets of RSs by the measurement result of the multiple sets of RSs: the UE acquires multiple sets obtained in the reporting period according to the measurement results of the multiple sets of RSs received in a certain reporting period a joint downlink CSI of the RS; or the UE acquires a joint downlink of the multiple groups of RSs according to the plurality of sets of RSs received in a certain reporting period and the measurement results of the plurality of sets of RSs received before the reporting period
  • the CSI obtains the downlink CSI of the multiple sets of RSs according to the measurement result of each group of RSs received in the latest one of the plurality of sets of RSs.
  • the transmission periods of the first and second groups of RSs are all five, and the time offsets are 0 and 2, respectively, that is, as shown in FIG. 6, the network devices are numbered 0, 5, 10.... Send the first group of RSs on the .., numbered 2, 7,
  • the second group RS is transmitted on the 12 of 12, and the UE measures the first and second groups of RS on the ⁇ numbered 0, 2, 5, 7, 10, 12.
  • the SINR measured by the UE for multiple groups of RSs is SINR0, SINR2, SINR5, SINR7, ..., respectively, and then the UE periodically acquires the joint downlink CSI according to the measured SINRs.
  • the bay ljUE obtains a joint downlink CSI according to SINR0 and SINR2, for example, (SINR0+SINR2)/2.
  • the reporting time is ⁇
  • the UE obtains the joint downlink CSI according to SINR5 and SINR7.
  • the UE may also acquire a joint downlink CSI or the like according to SINRO, SINR2, SINR5, and SINR7.
  • the UE can obtain more accurate joint downlink CSI according to the measurement result of multiple sets of RSs by measuring multiple sets of RSs, instead of reporting downlink CSI obtained by measuring a group of RSs, thereby enhancing downlink CSI. Measurement accuracy.
  • the embodiment of the present invention can also improve the measurement accuracy without increasing the resource density option of the UE. For example, the density of the CSI-RS does not need to be increased, and the minimum density still maintains 5 TTIs once, and the prior art configuration does not need to be changed, so The prior art design has better compatibility.
  • the second embodiment of the present invention may further include: for any one of the multiple groups of RSs, the UE receives the joint acquisition information corresponding to the group of RSs sent by the network device to the UE; the joint acquisition information may be Whether the measurement result of a certain group of RSs is added to the downlink CSI for acquiring the joint, or a subset of the RSs of a certain group, or whether the downlink CSI of all the groups of RSs is obtained according to the measurement results of all the groups of RSs; And determining, by the UE, the joint acquisition information sent by the network device for each group of RSs, whether the measurement result of the group of RSs needs to be added to the obtained downlink CSI, or determining the subset of the group of RSs to obtain the subset.
  • the joint downlink CSI or whether it is necessary to obtain the joint downlink CSI of all group RSs according to the measurement results of all group RSs.
  • the joint acquisition information includes only one bit.
  • the set of RSs is not added to the downlink CSI for obtaining the joint.
  • the group of RSs is added to obtain the combined downlink CSI. in.
  • the network device sends three sets of RSs to the UE.
  • the network device sends the joint acquisition information to the UEs as 1, 0, 1, respectively, and the UE obtains only the measurement results according to the first and third sets of RSs. Combined downlink CSI.
  • the UE may have multiple RS components into multiple subsets, and each subset may correspond to different cells, for example, the joint acquisition information includes 2 bits, and the joint acquisition information is 00, indicating the group of RSs.
  • 01, 10, and 11 respectively indicate that the group RS joins the first, second, and third subsets to obtain the combined downlink CSI of the first, second, and third subsets.
  • the network device sends 6 sets of RSs to the UE. For the 1st to 6th groups of RSs, the network device sends the joint acquisition information to the UEs as 01, 00, 01, 10, 11, and 11, respectively, and the UE pairs according to the first and third groups.
  • the measurement result of the RS acquires the joint downlink CSI of the first subset, the fourth group RS is measured to obtain the downlink CSI of the second subset, and the downlink of the third subset is obtained according to the measurement results of the 5th and 6th groups of RSs CSI.
  • the first, second, and third downlink CSIs correspond to cells 1 to 3, respectively.
  • the UE receives the joint acquisition information of the value sent by the network device to the UE, and indicates that the UE needs to obtain the joint downlink CSI of all the group RSs according to the measurement result of all the group RSs.
  • the method may further include: receiving, by the UE, power information of different powers used by the network device when sending the multiple sets of RS power information; in step 402, the UE according to the power information and each group The measurement result corresponding to the RS acquires the joint downlink CSI.
  • the network device uses the power P1 to transmit the first group RS, and the power P2 to transmit the second group RS; the UE receives the information of the PI and the P2 sent by the network device to the UE, where the information of P1 and P2 may be P1 and P2. The corresponding number, or the value of P1 and P2, etc.; after receiving the UE, the combined downlink CSI of the first and second sets of RSs is obtained according to the measurement results corresponding to P1, P2, and the first and second sets of RSs.
  • the UE separately measures the SINRs corresponding to the two sets of RSs, for example, the measured measurement results are SINR1 and SINR2, respectively, because the two sets of RSs correspond to different transmit powers, so if the two SINR1 and the direct use are used, It is not accurate enough to determine the final reported CQI by SINR2.
  • SINR1 corresponds to PlxlHI 2 /(I+N0)
  • SINR2 corresponds to P2xlHI 2 /(I+N0)
  • the CQI thus obtained cannot accurately reflect the true channel fading and interference. That is, IHI 2 /(I+N0); where H represents the downlink channel fading value, I represents the interference power received by the downlink RS, and NO represents the noise variance.
  • the UE may obtain the power information of the two sets of RSs sent by the network device, and obtain the reported downlink CSI according to different power information to obtain a reasonable report result; for example, the UE obtains SINR1 and SINR2. After calculating (SINR1/P1+SINR2/P2)/2, IHI 2 /(I+N0) can be obtained, and the CQI obtained according to the result can reflect the true channel fading.
  • the power information corresponding to the multiple groups of RSs is not limited to the network device needs to be sent to the UE for each group of RSs. Send a power information, you can only send the power information corresponding to part of the RS group. For example, both the network device and the UE pre-set the power of the first group of RSs to be the same as the power of the data RE. Therefore, it is not necessary to transmit the power information of the first group of RSs, and only the power information of other groups of RSs needs to be transmitted.
  • the method may further include: for a certain group of RSs, the UE receives, by the network device, information about an antenna port that needs to be measured in the group of RSs; and when the plurality of groups of RSs are measured, The UE only measures the RS sent by the antenna port corresponding to the antenna port information of the group of RSs according to the antenna port information;
  • the network device may send multiple groups of RSs to the UE, where at least one of the RSs corresponds to the coordinated cell, and at least one other group of RSs corresponds to the serving cell and the coordinated cell, as shown in FIG. 5.
  • the serving cell (such as the cell 1 in FIG. 5) indicates a cell that sends control signaling to the UE, for example, a Physical Downlink Control Channel (PDCCH) in the LTE-A technology.
  • PDCCH Physical Downlink Control Channel
  • one UE has only one serving cell. Serving for it; a coordinated cell (such as cell 2 in FIG.
  • the network device 1 transmits the first group RS and the second group RS
  • the network device 2 transmits the second group RS
  • the second group RS transmitted by the network device 1 corresponds to two antenna ports
  • the second group RS transmitted by the network device 2 also Corresponding to two antenna ports, the two antenna ports corresponding to the second group RS sent by the network device 1 are different from the two antenna ports corresponding to the second group RS sent by the network device 2, and the network devices can send data signals to the UE.
  • the cell 1 may separately transmit a data signal to the UE, or may jointly send a downlink data signal to the UE in conjunction with the cell 2 (the serving cell).
  • UE feedback is required: 1.
  • the network device 1 and the network device 2 jointly send the data signal to the UE as The serving cell and the coordinated cell in the hypothetical time jointly associate the corresponding downlink CSI.
  • the two network devices can send two sets of RSs to the UE, the first set of RSs includes two antenna ports, and is sent by the network device 1 to the UE; the second group of RSs includes four antenna ports, and the network device 1 and the network device 2 Simultaneously transmitting to the UE, where the network device 1 transmits the RS using antenna ports 0 and 1, and the network device 2 transmits the RS using antenna ports 2 and 3.
  • the UE measures the first group RS, and the downlink CSI corresponding to the network device 1 can be obtained.
  • the joint downlink CSI corresponding to the network device 1 and the network device 2 jointly transmitting data to the UE can be obtained.
  • the two sets of RSs can also be utilized to enhance the accuracy of CSI measurements for Cell 1.
  • the UE needs to measure the RSRQ corresponding to the network device 1, and can obtain the joint downlink RSRQ corresponding to the network device 1 according to the measurement results of the first group and the second group RS.
  • the RS of the second group RS is only transmitted by the network device 1 , and therefore the antenna port information for measuring the second group of RSs needs to be sent to the UE, so that the UE only measures the antenna corresponding to the target network device.
  • the second group RS corresponding to the antenna port in the port information.
  • the antenna port information may include one or more of antenna port number information, or antenna port number information, or antenna port subset information, or information of whether each antenna port is used for measurement.
  • the antenna port information includes the number of antenna port information.
  • the network device notifies the UE that only a certain group of RSs corresponding to the two antenna ports in the second group of RSs is to be measured, and the UE only measures all four antenna ports corresponding to the group of RSs.
  • the first two antenna ports in the middle (for example, the first two antenna ports before the measurement is the antenna port 0, 1); or, the antenna port information includes the antenna port number information, for example, the UE is notified that only the second group RS is numbered 2
  • the antenna port corresponding to the antenna port of 3, or the antenna port information includes the antenna port subset information.
  • the 4 antenna ports included in the second group RS are divided into 2 antenna port subsets, and the antenna ports numbered 0 and 1. That is, the antenna port subset numbered 0, and the antenna port numbered 2 and 3 is the antenna port subset numbered 1, and the network device only needs to notify the UE of the information of the antenna port subset number 1
  • the UE only measures antenna ports numbered 2 and 3 among all four antenna ports; or, the antenna port information includes information on whether each antenna port is used for measurement, for example, the second group RS includes 4 antenna ports, the network device sends 4 bits of information to the UE, and the ith bit indicates whether the UE measures the RS corresponding to the ith antenna port. For example, if the information is 1100, it indicates that the network device indicates that the UE measures the first. RS of 2 antenna ports.
  • the antenna ports corresponding to the different groups of RSs may be different. Therefore, the UE may measure the RSs sent by different antenna ports in different groups of RSs. . Alternatively, the RSs sent by different antenna ports corresponding to the same group of RSs belong to different subsets.
  • the UE only measures the antenna ports numbered 0, 1 in the first group RS and the antenna ports numbered 2 and 3 in the second group RS, which are not described here.
  • step 402 when the joint downlink CSI is obtained according to the measurement result corresponding to the multiple sets of RSs, the method can be implemented in multiple manners.
  • Example one
  • obtaining the joint downlink CSI according to the measurement result corresponding to the multiple groups of RSs may be performing linear averaging on the measurement results corresponding to the multiple groups of RSs to obtain the joint downlink CSI.
  • the measurement results obtained by the UE measuring the first and second sets of RSs are Al and A2, respectively, and the linear result of the measurement results corresponding to the two sets of RSs is (Al+A2)/ 2.
  • the measurement result of the multiple sets of RSs may be the measurement result obtained after performing single measurement on multiple sets of RSs, or may be performed after multiple measurements of multiple sets of RSs, and the RSs of each group are measured multiple times.
  • the measurement results of the respective sets of RS obtained after the joint calculation are respectively performed.
  • the measurement result obtained by the UE to measure the first and second groups of RSs may be a measurement result of performing single measurement on the first and second groups of RSs respectively; or may perform multiple measurements on the first and second groups of RSs respectively, and The measurement results obtained after the joint calculation of the measurement results of the multiple measurements corresponding to the first and second sets of RSs respectively.
  • the single measurement may be a method as follows: As shown in FIG. 6, it is assumed that the reporting time of the UE is number 4, and the measurement result obtained by the UE in the first group RS of the number 0 is A1. The measurement result obtained by measuring the second group RS of the ⁇ number 2 is A2, and the joint measurement result obtained by linearly averaging A1 and A2 is ( ⁇ 1+ ⁇ 2)/2, and the joint is obtained based on the measurement result.
  • the downlink CSI is obtained by the UE; or the UE obtains the joint downlink CSI according to the measurement result of the newly received multiple groups of RSs, for example, if the reporting time of the UE is the number 6, the latest two groups of RSs received by the UE are respectively numbered
  • the first group RS received by the TTI of 5 and the second group RS received by the number 2 is the measurement result of the first group RS measured by the UE at the TTI of number 5 is A1, at number 2
  • the measurement result A2 of the second group RS is measured, and the joint measurement result obtained by linearly averaging A1 and A2 is ( ⁇ 1+ ⁇ 2)/2, and the joint downlink CSI is obtained based on the measurement result.
  • the multiple measurement may be a method as follows: As shown in FIG. 6, it is assumed that the reporting time of the UE is a TTI numbered 13 and the UE measures the first group RS in the TTIs numbered 0, 5, and 10 The measurement result is filtered to obtain the measurement result A1, and the second group RS is measured and filtered in the numbers 2, 7, and 12 to obtain the measurement result A2, and the linear average of A1 and A2 is obtained ( ⁇ 1+ ⁇ 2)/2, and A joint downlink CSI is obtained based on the result of the linear averaging.
  • obtaining the combined downlink CSI according to the measurement result corresponding to the multiple sets of RSs may be multiple groups.
  • the measurement result corresponding to the RS is subjected to different weighted linear averaging to obtain the joint downlink CSI, wherein the weights corresponding to the groups of RSs may be notified to the UE by the network device, or preset to the network device and the UE, where, according to multiple groups
  • the different parameters of the RS set different weights for each group of RSs.
  • the parameters herein may be one or more of a transmission power, a power deviation of the RS, and a transmission period of the RS.
  • the size of the weight can be set by means of simulation and experience, and the embodiment of the present invention does not limit how to set the weight.
  • different weights are set for the different groups of RSs according to the parameters of the different groups of RSs, so that the measurement results corresponding to the groups of RSs have different contributions to the final combined downlink CSI, so
  • different weights are used to weight the measurements of different sets of RSs to obtain the final combined downlink CSI. For example, in the case of two sets of RSs, if the measurement results of the two sets of RSs obtained by any of the above measurement methods are A1 and A2, respectively, the results of linear averages of different weights in the present embodiment are (mlxAl+m2xA2).
  • the information of the values of ml and m2 can be transmitted by the network device to the UE, so that flexibility can be obtained.
  • the information of the values of ml and m2 may be the numbers of the values of ml and m2.
  • the correspondence between the numbers of ml and m2 and the values of ml and m2 is preset in the UE and the network device.
  • the information of the values of ml and m2 may not be limited to the numbers of the values of ml and m2, for example, the values of ml and m2 may be transmitted.
  • the information of the values of the ml and the m2 may be preset in the network device and the UE by presetting the mapping table of the parameters and the weights corresponding to the different groups of RSs, that is, stored in the network device and the UE, when the network device sends the message to the UE.
  • the parameters corresponding to the RS group, the UE can obtain the weight according to the parameter and the preset mapping table.
  • the network device and the UE are preset with a mapping relationship as shown in Table 1:
  • the UE can learn from Table 1.
  • the weight of the corresponding group of RSs is 2; if the network device notifies the UE that the power deviation information of the second group of RSs is OdB (that is, the power of the RE corresponding to the RS is the same as the power of the data RE), the UE can know from Table 1 that the weight corresponding to the second group RS is 1.
  • the parameter of the RS group is the transmission period of the RS
  • the transmission period of the first group RS is 10 ⁇
  • the transmission period of the second group RS is 5 ⁇
  • the density of the RS of one group is larger and the reliability is higher.
  • the weight of the RS of the first group is 1/4
  • the weight of the RS of the second group is 1/2.
  • the correspondence between the sending period and the weight may also be preset.
  • the multiple sets of RSs received by the UE are multiple sets of RSs that the network device periodically sends to the UE; the UE periodically reports the combined downlink CSI.
  • Obtaining the joint downlink CSI according to the measurement result corresponding to the multiple sets of RSs may be performed by the UE after receiving the set of RSs sent by any one of the multiple sets of RSs in a certain transmission period.
  • the measurement is performed, and the measurement result obtained this time is filtered with the filtering result obtained by filtering the plurality of sets of RSs before, so as to obtain the joint downlink CSI.
  • the filtering factor may be preset in the UE and the network device, or the network device may notify the UE of the filtering factor by sending signaling to the UE.
  • the network device usually periodically sends a group of downlink RSs.
  • the UE can filter the measurement result by the formula (1) after each measurement, thereby enhancing the measurement accuracy:
  • M_new (l-Filter_factor)xM_old + Filter_factorxM_mea ( 1 )
  • M_mea represents the CSI measurement result obtained by the current measurement
  • M_old represents the filtering result before the current measurement
  • M_new represents the new filtering result obtained after filtering the current measurement result.
  • Filter_factor represents the filter factor, usually a number between 0 and 1.
  • the measurement result is used to obtain a new filtering result according to the formula (1), and the filtering result obtained at this time is Multiple sets of RSs are filtered results obtained by filtering. For example, if the filtered result of the multiple sets of RSs obtained in the TTI before the number 5 is M_old, the UE receives the first set of RSs after the first set of RSs in the present transmission period, and obtains the measurement by measurement after the number 5 is received.
  • the filtering factor may be preset in the UE and the network device, or may be notified by the network device by sending signaling to the UE. It can be seen from this example that the filtering result in this example is to filter multiple sets of RSs to obtain joint downlink CSIs of multiple sets of RSs according to the measurement results of multiple sets of RSs.
  • the UE may obtain the reported downlink CSI according to the filtering result of the multiple sets of RSs. For example, if the reported downlink CSI is RSRQ and M_new indicates the SINR, the M_new may be reported to the network device as the RSRQ at the reporting time. . Alternatively, if the reported CSI is CQI, the reported CQI may be determined according to M_new, and the determined CQI is reported to the network device at the reporting time.
  • different filtering factors may be set for different groups of RSs, where the filtering factors corresponding to the groups of RSs may be notified to the UE by the network device, or the filtering factors corresponding to the groups of RSs may be preset in the network device and the UE, where Different parameters of the RS group correspond to different filtering factors.
  • the setting of the filtering factor can refer to the setting of the weight used when performing the linear averaging of different weights, and details are not described herein again.
  • different filtering factors are used to respectively filter the measurement results of different groups of RSs, and more accurate results can be obtained.
  • the filtering factors of different RS groups may be notified by the network device, or preset in the network device and the UE.
  • the specific embodiment is similar to the foregoing weighting embodiment, and details are not described herein again.
  • an embodiment of the present invention provides a network device 70, where the network device 70 is configured to perform a method for reporting downlink CSI by using the foregoing network device.
  • This embodiment only describes the structure of the network device. It can be described in conjunction with the method embodiments.
  • the network device 70 includes a transmitting module 701 and a receiving module 702.
  • a sending module 701 configured to send, to the UE, multiple sets of reference signals RS;
  • the receiving module 702 is configured to receive the combined downlink channel state information CSI reported by the UE to the network device 70, where the joint downlink CSI is measured by the UE after the multiple groups of RSs are measured according to the The combined downlink CSI of the plurality of sets of RSs obtained by the measurement results of the group RS.
  • the network device 70 sends multiple sets of RSs to the UE, and receives the combined downlink CSI obtained by the UE according to the measurement result of the multiple sets of RSs, instead of receiving the downlink reported by the UE by measuring a group of RSs.
  • CSI which enhances measurement accuracy.
  • the embodiment of the present invention can also improve the measurement accuracy without increasing the resource density option by the network device 70. For example, the density of the CSI-RS does not need to be increased, the minimum density is still maintained once, and the prior art does not need to be changed. The configuration is therefore compatible with prior art designs.
  • the sending module 701 is further configured to send, to the UE, information of multiple sets of RSs before sending the multiple sets of reference signals RS to the UE, so that the UE receives the multiple groups according to the information of the multiple sets of RSs.
  • RS wherein the information of the plurality of sets of RSs includes one or more of a transmission period of the RS, RS sequence information, and a number of antenna ports included in each group of RSs.
  • the sending module 701 is further configured to send, to the UE, power information that is used by the network device 70 when sending the multiple sets of RSs, so that the UE according to the power information and the multiple groups The measurement result corresponding to the RS acquires the combined downlink CSI.
  • the sending module 701 is further configured to send antenna port information to the UE for a certain group of RSs, where the antenna port information is an antenna of a group of RSs in the plurality of groups of RSs that need to measure RS Information of the port, so that the UE measures the RS sent by the corresponding antenna port according to the antenna port information.
  • the sending module 701 is further configured to send, to the UE, joint acquisition information corresponding to any group of RSs, where the joint acquisition information is used to indicate whether the measurement result of the any group of RSs is added. To obtain the joint downlink CSI, or whether to obtain the joint downlink CSI of all group RSs according to the measurement results of all group RSs.
  • the sending module 701 is specifically configured to send the multiple groups of RSs belonging to the first subset, where the first subset belongs to one set;
  • the sending module 701 is further configured to send, to the UE, one or more groups of RSs corresponding to the second subset, where the second subset also belongs to the set;
  • the receiving module 702 is further configured to receive a downlink CSI of the second subset reported by the UE to the network device 70, where, if the second subset includes multiple groups of RSs, the second sub
  • the downlink CSI of the set is the combined downlink CSI of the multiple sets of RSs corresponding to the second subset.
  • the sending module 701 is further configured to send the subset information to the UE or send the joint acquiring information to the UE, so that the UE obtains the information according to the subset information or according to the joint information. , determining a subset of any group of RS affiliations,
  • the subset information includes information of each group of RSs included in the first subset and the second subset; and the joint acquisition information includes information of a subset of any one of the RSs.
  • the downlink CSI includes one or more of RI, PMI, CQI, RSRP, RSRQ, and reception time offsets of multiple groups of RSs.
  • the network device 70 is a BS, an AP, an RRE, an RRH, an RRU, or a relay node.
  • this embodiment only describes the modules related to the embodiments of the present invention, and is not limited to the module division manners provided by the modules or the embodiments of the present invention.
  • the sending module 701 and the receiving module 702 may be the same.
  • a component, such as a transceiver, can also be two components.
  • the embodiment may further include other modules, for example, the sending module 701 and the receiving module 702 may be connected by a processing module, and configured to perform related processing according to the downlink joint CSI received by the receiving module 702. Or used to instruct the sending module 701 to send related information and the like.
  • the present embodiment can perform the steps of the foregoing method for reporting the downlink CSI of the network device.
  • the steps of the foregoing method for reporting the downlink CSI of the network device For details, refer to the description in the foregoing two method embodiments, and the effect that can be obtained by the embodiment can also refer to the foregoing method embodiment. The description in the description will not be repeated here.
  • the "group”, “set” and “subset” in this embodiment do not necessarily have operations of dividing groups, dividing sets or subsets, as described in the above embodiments.
  • an embodiment of the present invention provides a user equipment 80, where the user equipment 80 can be used to perform the method for reporting the downlink CSI of the user equipment 80.
  • the user equipment 80 includes a receiving module 801, an obtaining module 802, and a transmitting module 803.
  • the receiving module 801 is configured to receive multiple sets of reference signals RS sent by the network device, and send the information to the acquiring module 802. Transmitting the plurality of sets of RSs;
  • the obtaining module 802 is configured to measure the multiple sets of RSs that are sent by the receiving module 801, obtain measurement results of each group of RSs, and obtain joints of the multiple groups of RSs according to the measurement results of the groups of RSs.
  • the sending module 803 is configured to report the joint downlink CSI transmitted by the acquiring module 802 to the network device.
  • the UE receives the multiple sets of RSs sent by the network device, and reports the combined downlink CSIs obtained according to the measurement results of the multiple sets of RSs, instead of reporting the downlink CSI obtained by measuring a set of RSs.
  • the embodiment of the present invention can also improve the measurement accuracy without increasing the resource density option of the network device. For example, the density of the CSI-RS does not need to be increased, the minimum density is still maintained once, and the prior art does not need to be changed. Configuration, therefore, has better compatibility with prior art designs.
  • the acquiring module 802 is specifically configured to perform linear averaging on the measurement results corresponding to the multiple groups of RSs, and obtain the joint downlink CSI of the multiple groups of RSs; or, corresponding to the multiple groups of RSs.
  • the measurement results are weighted linearly averaged, and the combined downlink CSI of the plurality of sets of RSs is obtained.
  • the obtaining module 802 is specifically configured to perform weighted linear averaging on the measurement results corresponding to the multiple groups of RSs according to the weights of the groups of RSs received by the receiving module 801 from the network device, where the The weight value is set by the network device according to different parameters of the multiple groups of RSs, and the parameters include one or more of a sending power, a power deviation of the RS, and a sending period of the RS. Or
  • the user equipment 80 further includes: a storage module 802a, configured to store different parameters of the multiple groups of RSs, where the parameters include a transmission power, a power deviation of the RS, and a transmission period of the RS.
  • the obtaining module 802 is specifically configured to: acquire different parameters of multiple sets of RSs from the storage module 802a, and set the different weights set for each group of RSs according to different parameters of the multiple sets of RSs. And performing weighted linear averaging on the measurement results corresponding to the plurality of sets of RSs.
  • the receiving module 801 is specifically configured to receive, by the network device, the multiple groups of RSs that are periodically sent to the UE;
  • the sending module 803 is specifically configured to periodically report the joint downlink CSI to the network.
  • Network equipment
  • the acquiring module 802 is specifically configured to acquire, according to the measurement result of the multiple groups of RSs received by the receiving module 801 in a reporting period, the downlink CSI of the multiple groups of RSs obtained in the reporting period; or The received multiple sets of RSs received by the receiving module 801 and the measured results of the multiple sets of RSs received before the reporting period are obtained by the receiving module 801, and the combined downlink CSI of the multiple sets of RSs is obtained; or The measurement results of the received sets of RSs received by the receiving module 801 received by the receiving module 801 in the reporting period of the group RS are obtained by the combined downlink CSI of the multiple sets of RSs.
  • the receiving module 801 is specifically configured to receive, by the network device, the multiple groups of RSs that are periodically sent to the UE;
  • the sending module 803 is specifically configured to periodically report the combined downlink CSI to the network device.
  • the obtaining module 802 is specifically configured to: after receiving, by the receiving module 801, the set of RSs sent by a group of RSs in a plurality of groups of RSs in a reporting period, the group that is received this time
  • the RS performs measurement, and filters the measurement result of the set of RSs obtained this time and the filtering result obtained by filtering the plurality of sets of RSs before, and acquires the combined downlink CSI of the multiple sets of RSs.
  • the acquiring module 802 is specifically configured to filter, according to different filtering factors corresponding to different groups of RSs, the measurement results of the current set of RSs and the filtering results obtained by filtering the multiple sets of RSs before. Filtering, where
  • the filtering factors corresponding to the different groups of RSs are received by the receiving device 801 from the network device, where the filtering factor is set by the network device according to different parameters of the multiple groups of RSs for different groups of RSs.
  • the user equipment 80 further includes a storage module 802a, configured to store different parameters of the multiple sets of RSs; a filter factor corresponding to the different sets of RSs is the multiple groups that are acquired by the obtaining module 802 according to the storage module 802a.
  • the different parameters of the RS are set for each group of RSs.
  • the parameters include a transmission power, a power deviation of the RS, and a transmission period of the RS.
  • the receiving module 801 is further configured to receive power information used by the network device when sending the multiple groups of RSs, and transmit the power information to the acquiring module 802;
  • the obtaining module 802 is specifically configured to: according to the power information and the measurement of the multiple groups of RSs As a result, the combined downlink CSI of multiple sets of RSs is obtained.
  • the receiving module 801 is further configured to receive antenna port information that is sent by the network device to the UE, and transmit the antenna port information to the acquiring module 802, where the antenna port information is The antenna port information of the RS needs to be measured by a certain group of RSs in the multiple groups of RSs;
  • the obtaining module 802 is specifically configured to: for the certain group of RSs, measure an RS sent by a corresponding antenna port corresponding to the set of RSs according to the antenna port information;
  • the antenna port information includes one or more of antenna port number information, antenna port number information, and information about whether each antenna port is used for measurement.
  • the receiving module 801 is further configured to receive, by the network device, information that sends multiple sets of RSs to the UE before sending the multiple sets of RSs, where the information of the multiple sets of RSs includes an RS sending period, and an RS. Sequence information, one or more of the number of antenna ports included in each group of RSs;
  • the receiving module 801 is specifically configured to receive the multiple groups of RSs according to the information of the multiple groups of RSs.
  • the receiving module 801 is further configured to: receive the joint acquisition information sent by the network device to the UE, and transmit the joint acquisition information to the acquiring module 802;
  • the obtaining module 802 is further configured to: determine, according to the joint acquiring information, whether a measurement result of a group of RSs needs to be added to obtain the downlink CSI of the joint, or determine whether it is required to obtain the measurement result according to all groups of RSs.
  • the combined downlink CSI is further configured to: determine, according to the joint acquiring information, whether a measurement result of a group of RSs needs to be added to obtain the downlink CSI of the joint, or determine whether it is required to obtain the measurement result according to all groups of RSs. The combined downlink CSI.
  • the receiving module 801 is specifically configured to receive the multiple groups of RSs that belong to the first set, where the first subset belongs to a set, and the receiving module 801 is further configured to receive the network device. Transmitting one or more sets of RSs of the second subset, and transmitting one or more sets of RSs of the second subset to the obtaining module 802;
  • the obtaining module 802 is further configured to: measure one or more sets of RSs of the second subset received by the receiving module 801 to obtain measurement results of each group of RSs of the second subset, and according to the The measurement result of each group RS of the second subset acquires the downlink CSI of the second subset, and transmits the downlink CSI of the second subset to the sending module 803; wherein, if the second subset includes a plurality of sets of RSs, wherein the downlink CSI of the second subset is a joint downlink CSI of the plurality of sets of RSs of the second subset;
  • the sending module 803 is further configured to send, to the network device, a downlink CSI of the second subset that is sent by the acquiring module 802. Further, the receiving module 801 is further configured to receive the subset information that is sent by the network device to the UE, or receive the joint acquisition information that is sent by the network device to the UE, and The joint acquisition information is transmitted to the obtaining module 802;
  • the obtaining module 802 is further configured to determine, according to the subset information transmitted by the receiving module 801, or according to the joint obtaining information, a subset of any group of RSs, wherein the subset information includes Information of each group of RSs included in the first subset and the second subset; the joint acquisition information includes information of a subset of any one of the RSs.
  • the receiving module 801 is further configured to receive the antenna port information that is sent by the network device to the UE, where the antenna port information includes antenna port subset information.
  • the obtaining module 802 is specifically configured to: according to the antenna port information, measure an RS sent by a corresponding antenna port of a group of RSs, and determine a subset to which the RS sent by the antenna port belongs.
  • the present embodiment can perform the steps of the foregoing method for reporting the downlink CSI of the user equipment.
  • the steps of the foregoing method for reporting the downlink CSI of the user equipment For details, refer to the description in the foregoing two method embodiments, and the effect that can be obtained by the embodiment can also refer to the foregoing method embodiment. The description in the description will not be repeated here.
  • the "group”, “set” and “subset” in this embodiment do not necessarily have operations of dividing groups, dividing sets or subsets, as described in the above embodiments.
  • an embodiment of the present invention provides a system for reporting channel state information, where the system includes the user equipment 80 provided by the foregoing embodiment, and the network device 70 provided by the foregoing embodiment.
  • the user equipment 80 may be configured to perform the method for reporting the downlink CSI of the user equipment, where the network device 70 may be used to perform the method for reporting the downlink CSI of the network device, and the specific principle may be as described in the method embodiment. . And the technical effects that can be obtained can also be referred to the above embodiments.
  • each functional module is merely an example. In actual applications, the foregoing may be considered according to requirements, such as configuration requirements of corresponding hardware or convenience of implementation of software.
  • the function assignment is performed by different functional modules, that is, the internal structure of the user equipment or network equipment is divided into different functional modules to complete all or part of the functions described above.
  • the corresponding functional modules in the foregoing embodiments may be implemented by corresponding hardware, or may be executed by corresponding hardware.
  • the foregoing sending module of the network device may have the foregoing implementation.
  • the hardware such as the receiver, that the UE can measure the combined downlink CSI information reported to the network device after the joint CSI of the multiple sets of RSs is measured by the multiple RSs according to the measurement result of the multiple sets of RSs
  • the receiver may also be capable of
  • a general processor or other hardware device, such as an antenna, that executes a corresponding computer program to perform the aforementioned functions may also be a general processor or other hardware device capable of executing a corresponding computer program to perform the aforementioned functions; the aforementioned receiving module and transmitting of the user equipment
  • the module is similar to the receiving module and the sending module of the network device, and is not described here.
  • the foregoing CSI obtaining module may be configured to perform the foregoing performing the foregoing to separately measure the multiple groups of RSs received by the receiving module, and obtain each Obtaining the measurement result of the group RS, and acquiring hardware of the combined downlink CSI of the plurality of groups of RSs according to the measurement result of each group of RSs obtained by the measurement module, for example, a processor, or capable of executing a corresponding computer program to complete the foregoing function General processor or other hardware device (this manual mentions The various embodiments described above principles can be applied).
  • the program may be stored in a computer readable storage medium, and the storage medium may include: Read only memory (ROM, Read Only Memory), random access memory (RAM), disk or optical disk.

Abstract

本发明提供了上报信道状态信息的方法和装置。一种方法包括：用户设备UE接收网络设备发送的多组参考信号RS；测量所述多组RS得到各组RS的测量结果，根据所述多组RS的所述测量结果获取所述多组RS的联合的下行信道状态信息CSI；以及将所述联合的下行CSI上报给所述网络设备。本发明可以使UE通过测量网络设备发送的多组RS，并根据多组RS的测量结果获取多组RS 的联合的下行CSI，从而增强下行CSI的测量精度。

Description

上报信道状态信息的方法和装置
本申请要求于 2012年 7月 11日提交中国专利局、申请号为 201210239102.X、 发明名称为"上报信道状态信息的方法和装置"的中国专利申请的优先权，其全部 内容通过引用结合在本申请中。 技术领域
本发明涉及通信领域，尤其涉及使用下行参考信号的方法和装置。
背景技术
不同频带的信道衰落的差异通常较大，若网络设备在信道条件良好的频带 上向用户设备（ User Equipment , UE )发送数据，则能提升传输效率和可靠性。 因此为了进行合理的频域调度 ， 网络设备通常会向 UE发送下行参考信号 ( Reference Signal , RS ) , 例如长期演进的进一步演进 （ Long Term Evolution-Advanced , LTE-A )系统中的信道状态信息-参考信号（ Channel State Information-Reference Signal , CSI-RS )。 UE在收到下行 RS之后，会对收到的下 行 RS进行测量，并向网络设备上报下行 CSI。
通常， 一方面，用于网络设备发送下行 RS的资源越多， UE对下行 CSI的测 量精度越高；另一方面， 由于用于发送这些下行 RS的资源通常不会被用于传输 数据，因此网络设备用于发送下行 RS的资源越少，这些下行 RS占用的开销也就 越小。 为了取得一个折衷，在系统设计的时候，网络设备可以通过向 UE发送信 令来配置下行 RS的资源密度。 例如，在 LTE-A系统中 ，网络设备可以向 UE发送 信令来配置 CSI-RS的发送周期 ，最小的 CSI-RS的发送周期为 5个传输时间间隔 ( Transmission Time Interval ,ΤΤΙ )，具体地，网络设备和 UE都预设置多个 CSI-RS 发送周期的配置，网络设备向 UE发送这些配置的编号，UE就可以根据该编号查 询 CSI-RS发送周期配置表以获取网络设备确定的 CSI-RS的发送周期的配置。
现有技术的上述方案仅考虑了单个节点服务某一 UE的场景，在这种场景中 ， 服务 UE的单个节点通常是所有节点中信道状况最好的节点， 因此上述方案为下 行 RS的资源密度设计的最小值能满足这种情况下单个节点对应的下行 CSI的测 量精度。 例如：在 LTE-A系统中 ，使用最小发送周期为 5个 ΤΉ来发送 CSI-RS能 保证测量精度。 随着协作多点发送 /接收 （ Coordinated Multiple Point transmission/reception , CoMP )技术的出现，某一 UE可以被多个节点服务，相 应地， UE就需要测量多个节点对应的下行 CSI。 在多个节点服务某一 UE的场景 中 ，有一些节点的信道状况通常较差，此时上述例如 CSI-RS的发送周期的最小 值就无法满足这些节点对应的下行 CSI的测量精度。 例如，在 LTE-A系统中 ，节 点 1和节点 2同时服务 UE1 ,节点 1的信道状况较好，而节点 2的信道状况较差，最 小发送周期为 5个 ΤΉ的设计能满足 UE对节点 1对应的下行 CSI的测量精度，却不 能满足节点 2对应的下行 CSI的测量精度。 发明内容
本发明提供上报信道状态信息的方法、 用户设备和网络设备，以增强下行 CSI的测量精度。
第一方面，提供了一种上报信道状态信息的方法，所述方法包括： 用户设备 UE接收网络设备发送的多组参考信号 RS；
测量所述多组 RS得到各组 RS的测量结果，根据所述多组 RS的所述测量结果 获取所述多组 RS的联合的下行信道状态信息 CSI；以及
将所述联合的下行 CSI上报给所述网络设备。
第二方面，提供了一种上报信道状态信息的方法，所述方法包括： 网络设备向用户设备 UE发送多组参考信号 RS；以及
接收所述 UE向所述网络设备上报的联合的下行信道状态信息 CSI，其中 ，所 述联合的下行 CSI为所述 UE对所述多组 RS测量后根据所述多组 RS的测量结果获 取的所述多组 RS的联合的下行 CSI。
第三方面，提供了一种用户设备，所述用户设备包括：
接收模块，用于接收网络设备发送的多组参考信号 RS ,并向获取模块传输 所述多组 RS；
所述获取模块，用于测量所述接收模块传输的所述多组 RS ,得到各组 RS的 测量结果，根据所述各组 RS的所述测量结果获取所述多组 RS的联合的下行信道 状态信息 CSI ,并向发送模块传输所述联合的下行 CSI；以及 所述发送模块，用于将所述获取模块传输的所述联合的下行 CSI上报给所述 网络设备。
第四方面，提供了一种网络设备，所述网络设备包括：
发送模块，用于向用户设备 UE发送多组参考信号 RS；以及
接收模块，用于接收所述 UE向所述网络设备上报的联合的下行信道状态信 息 CSI ,其中 ，所述联合的下行 CSI为所述 UE对所述多组 RS测量后根据所述多组 RS的测量结果获取的所述多组 RS的联合的下行 CSI。
上述上报信道状态信息的方法、 用户设备和网络设备，可以使 UE通过测量 网络设备发送的多组 RS ,并根据多组 RS的测量结果获取多组 RS的联合的下行 CSI ,从而增强下行 CSI的测量精度。 附图说明
为了更清楚地说明本发明实施例的技术方案，下面将对现有技术或实施例 描述中所需要使用的附图作简单地介绍 ，显而易见地，下面描述中的附图仅仅 是一些实施例，对于本领域技术人员来讲，还可以利用这些附图获得其他的附 图。
图 1是本发明实施例提供的一种上报信道状态信息的方法流程示意图 ； 图 2是本发明实施例提供的网络设备发送的多组 RS在一个物理资源块 ( Physical Resource Block , PRB )中所占用的资源单元 ( Resource Element , RE ) 的示意图 ；
图 3是本发明实施例提供的网络设备发送的多组 RS在一个 PRB中所占用的 RE的一示意图 ；
图 4是本发明实施例提供的另一种上报信道状态信息的方法流程示意图 ； 图 5是本发明实施例提供的多个小区向 UE发送信号的示意图 ；
图 6是本发明实施例提供的网络设备发送多组 RS的传输时间间隔 ( Transmission Time Interval , ΤΤΙ )关系不意图 ； 图 7是本发明实施例提供的用户设备结构示意图 ；
图 8是本发明实施例提供的一种网络设备结构示意图 ；
图 9是本发明实施例提供的又一种网络设备结构示意图。 具体实施方式
下面将结合本发明实施例中的附图 ，对本发明实施例中的技术方案进行清 楚、 完整地描述，显然，所描述的实施例仅仅是本发明一部分实施例，而不是 全部的实施例。 基于本发明中的实施例 ，本领域技术人员所获得的所有其他实 施例，都属于本发明保护的范围。
需要说明的是，在不冲突的情况下，本发明实施例以及实施例中的特征可 以相互任意组合。
在例如 LTE-A的现有技术中 ， 一个 ΤΉ为 lms ,包括 14个符号；系统带宽包 括多个物理资源块（ Physical Resource Block , PRB ) , 一个 PRB的带宽包括 12 个子载波，一个资源单元（ Resource Element , RE )在频域上占据一个子载波、 在时域上占据一个符号长度。 网络设备为了获取下行 CSI ,可以在每个 PRB中都 发送 RS。 UE收到 RS之后，通过测量收到的 RS就可以获取下行 CSI ,并将获取的 下行 CSI反馈给网络设备。 通常，网络设备周期性地向 UE发送用于测量下行 CSI 的下行 RS ,例如，发送周期为 5个 TTI ,并且时间偏移为 0个 ΤΉ ,这样， UE就在 编号为 0,5,10......的 ΤΉ上测量下行 RS以获取下行 CSI。当某节点对应的下行信道 状况较差时，即使网络设备按照最小发送周期向 UE发送下行 RS , UE测量得到的 下行 CSI的准确度仍然不够高。
此外，为了解决上述问题，现有技术的一种解决办法是增加下行 RS的资源 密度，例如以 2个 ΤΉ为发送周期发送下行 RS。 然而，上述现有技术中 ，增加下 行 RS的资源密度的方法的缺点在于需要网络设备和 UE都增加新的资源密度，例 如，以更小的发送周期发送下行 RS ,或者使用更多的频率资源发送下行 RS。 具 体的 ，可以是在 LTE-A现有 CSI-RS发送周期配置表的基础上增加 CSI-RS的发送 周期配置选项，便于网络设备向 UE发送信令、 将对应更小发送周期（例如发送 周期为 2个 ΤΉ )的 CSI-RS的发送周期配置通知 UE，从而使 UE根据这个更小发送 周期来检测 CSI-RS ,这需要 UE和网络设备都进行相应修改。 针对上述现有技术中 UE测量得到的下行 CSI的准确度不够高的问题，本发明 实施例提出网络设备向 UE发送多组 RS ,使得 UE对多组 RS进行测量，并根据多 组 RS的测量结果获取更精确的多组 RS的联合的下行 CSI。 同时，本发明实施例 无需在网络设备和 UE的 CSI-RS发送周期配置表中增加资源密度选项，从而具有 较好的兼容性。 一方面，本发明一实施例提供了一种上报信道状态信息的方法，如图 1所示， 该方法包括如下步骤。
步骤 101 , 网络设备向 UE发送多组 RS；
本步骤中 ，多组 RS可以是具有不同属性的多组 RS。 一组 RS可以包括至少一 个天线端口对应的 RS (后续简称一个 RS )。 同一组 RS指相同信令配置的一个或 多个 RS ,不同组 RS是由不同信令配置， 因此，同一组 RS的属性相同。
例如，网络设备向 UE发送一则信令，UE即可通过这则信令获知采用相同信 令配置的所有 RS的信息，从而可以接收该组 RS。例如，网络设备向 UE发送一组 RS中的一个 RS的 RE信息，则 UE即可通过该信息获知该组 RS中所有 RS对应的 一种示例中 ，属性可以包括： RS的发送周期、 同一发送周期内的时间偏移、 和 RS对应的 RE中的一种或多种。例如：所述多组 RS为下列一种或任意组合的多 组 RS:具有不同发送周期的多组 RS、同一发送周期内的具有不同时间偏移的多组 RS和对应不同 RE的多组 RS。本文中不同 RE可以是在一个 ΤΉ内用于传输 RS的具 有不同子载波编号和 /或符号编号的 RE。
例如，
在具有不同发送周期的两组 RS中 ，第 1组 RS的发送周期为 5个 TTI ,第 2组 RS 的发送周期为 10个 ΤΉ；
在同一发送周期内的具有不同时间偏移的两组 RS中 ，第 1和 2组 RS的发送周 期都为 5个 ΤΉ ,但第 1和 2组 RS的时间偏移分别为 0和 2个 ΤΉ；
在对应不同 RE的两组 RS中 ，在一个 PRB中 ，第 1和 2组 RS对应的 RE如图 2所 示，即在一个 PRB中 ，第 1组 RS对应的 RE为（5,9)和 (6,9)，第 2组 RS对应的 RE为（5,3) 和 6,3) ,其中 RE可以通过t,k)来表示其符号编号和子载波编号， t表示该 RE在一 个 ΤΉ中对应的符号编号， k表示该 RE在一个 PRB上对应的子载波编号。
或者两组 RS为上述任意三种示例的组合，例如两组 RS的发送周期不同并且 对应不同的 RE ,这里不再赘述。
在另一示例中 ，属性还可以包括： RS的类别。 因此，本示例中 ，所述多组 RS可以是类别不同的 RS ,其中 ，类别包括公共参考信号（ Common Reference Signal , CRS )和 CSI-RS。
RS包括 CRS和 CSI-RS，其中 CRS可以在每个 ΤΉ都被发送，但最多只能通过 4个编号为 0~3的天线端口被发送； CSI-RS的最小发送周期可以是 5个 ΤΤΙ ,最多 能通过 8个编号为 15~22天线端口被发送。
本发明实施例中 ， 当网络设备通过相同个数的天线端口用相同的物理天线 向 UE发送 CRS和 CSI-RS日寸， 由于此时发送 CRS和 CSI-RS的信道是相同的， 因此 可以通过对 CRS和 CSI-RS进行测量获得各自的测量结果，并根据 CRS和 CSI-RS 的测量结果获取 CRS和 CSI-RS的联合的下行 CSI，从而可以提高测量精度。例如， 网络设备通过相同的物理天线向 UE发送第 1组 CRS和第 2组 CSI-RS，其中 ，第 1 组 CRS对应天线端口编号为 0~3的 CRS ,其发送周期为 1个 ΤΉ ,第 2组 CSI-RS对 应天线端口编号为 15~18的 CSI-RS ,其发送周期为 5个 TTI；这两组 RS对应不同 的 RE ,如图 3所示； UE收到第 1组 CRS对应的 RE并对第 1组 CRS进行测量，可以 获得天线端口 0~3对应的 CRS的测量结果；收到第 2组 CSI-RS对应的 RE并对第 2 组 CSI-RS进行测量，就可以获得天线端口 15~18对应的 CSI-RS的测量结果。 由于 本示例中 ，第 1组 CRS和第 2组 CSI-RS对应相同个数的天线端口 （如 4个天线端 口 ） ，并且是网络设备通过相同的物理天线（例如 4根物理天线）发出来的，则 这两组 RS对应的信道就是一样的，那么可以根据第 1组 CRS和第 2组 CSI-RS的测 量结果获取更精确的联合下行 CSI。
这里说明一下物理天线和天线端口的区别。 物理天线对应的是实际的天线， 而天线端口则是 UE能够分辨的虚拟化的天线，例如，一个实际的网络设备包括 4 根物理天线，如果这 4根物理天线发送相同的信号（即输入一路信号，其被复制 到 4根物理天线，等价于 1路信号被乘以一个 4x1的矩阵） ，对于 UE来说只能分辨 出 1路天线端口 ，也即 4根物理天线被虚拟化为一个天线端口 ；如果网络设备将 4 路不同的信号通过 4个物理天线发出，并且 UE能分辨出 4路信号，则 4根物理天线 被虚拟化为 4个天线端口。 因此，在上例中 ，虽然网络设备向 UE发送 RS的天线 端口编号不同，但网络设备可以通过相同的物理天线来发送 RS，例如对于 4根物 理天线情况下，网络设备可以使用相同的物理天线发送编号为 0~3的天线端口对 应的 CRS和编号为 15~18的天线端口对应的 CSI-RS ,这样 CRS和 CSI-RS就对应相 同的信道衰落，就可以使用本发明实施例来测量更多的 RS从而增强测量精度。
网络设备可以通过至少 1个天线端口发送一组 RS ,并通过信令来向 UE通知 这个或这些 RS的 RE信息。 例如，网络设备向 UE发送一组 RS对应的 RE编号，并 通知 UE这组 RS对应 2个天线端口 ，UE收到之后就根据该编号来确定 2个天线端口 的 RS对应的 RE。
可选的 ，本实施例中 ，所述多组 RS还可以属于第一子集，其中 ，所述第一 子集属于一个集合，所述集合包括至少 2个子集，本申请中 ，所述集合中除所述 第一子集外的所有集合称为第二子集。 此时，本步骤中 ，所述网络设备还向所 述 UE发送的所述第二子集的一组或多组 RS。 当然，所述网络设备也可以不在本 步骤中向所述 UE发送的所述第二子集的一组或多组 RS ,而是分别发送各个子集 所对应的多组 RS。
UE在收到该第二子集所包括的一组或多组 RS后，可以根据子集对应的一组 或多组 RS的测量结果，获取该第二子集对应的下行 CSI; 如果所述第二子集包括 一组 RS , UE在收到该第二子集所包括的一组 RS后，可以根据该第二子集获取 该第二子集对应一组 RS的下行 CSI；如果所述第二子集包括多组 RS , UE在收到 该第二子集所包括的多组 RS后，可以根据该第二子集获取该第二子集对应的多 组 RS的联合的下行 CSI。 通过本可选实施例， UE可以把接收到的多组 RS分为多 个子集，从而使不同子集可以对应不同的特征，如小区。 例如， 网络设备向 UE 发送 6组 RS ,其中 ，第 1、 3组 RS为第 1子集， UE根据第 1、 3组 RS的测量结果获 取第 1子集对应的联合的下行 CSI；第 4组 RS为第 2子集， UE测量第 4组 RS来获取 第 2子集对应的下行 CSI；第 5、 6组 RS为第 3子集， UE根据第 5、 6组 RS的测量结 果获取第 3子集对应的联合的下行 CSI。
进一步地，可选的，对于多组 RS中的任一组 RS ,网络设备还可以向 UE发送 多组 RS的子集信息；以使 UE能够根据网络设备发送的子集信息，来确定各组 RS 与各子集的对应关系，并根据子集对应的 RS组的测量结果获取子集的联合的下 行 CSI。 子集信息可以包括：子集数目 ，以及一个或多个子集和多组 RS的对应关 系等中的一种或多种。 需要说明的是，本发明实施例中对"组"和"子集"的描述，并不一定需要网络 设备或 UE具有"划分组 "或"划分子集"的操作，而是为了便于更清楚的描述。对于 子集和组之间的关系来说，将具有不同特征的 RS作为不同的子集，具有相同特 征的 RS组作为同一子集，其中特征包括发送 RS的物理天线和 /或 RS对应的天线 端口等。 例如：将由不同物理天线发送的 RS组或映射到不同天线端口的 RS组或 者具有其他不同特征的 RS组作为不同的子集，相同特征的 RS组作为同一子集。 而且，下文中的"组"和"子集"的描述与此相同。 可选地，步骤 101之前，本发明实施例一还可以包括：网络设备可以提前向 UE发送多组 RS的信息，便于 UE根据该多组 RS的信息来接收多组 RS。 其中 ，多 组 RS的信息可以包括 RS的发送周期、 RS序列信息、以及每组 RS对应的天线端口 的数目中的一种或多种等等。 可选地，步骤 101中 ，网络设备可以使用不同的功率向 UE发送所述多组 RS , 此时，本发明实施例一还可以包括步骤：网络设备向 UE发送多组 RS对应的功率 信息，以使 UE根据该功率信息和测量结果获取联合的下行 CSI。 步骤 102 ,接收所述 UE上报的所述多组 RS的联合的下行 CSI ,其中所述联合 的下行 CSI为所述 UE对所述多组 RS测量并根据多组 RS的测量结果获取的多组 RS的联合的下行 CSI。 本步骤中 ，下行 CSI可以包括秩指示（ Rank Indicator , RI )、 预编码矩阵指 示( Precoding Matrix Indicator , PMI )、信道质量指示 ( Channel Quality Indicator , CQI )、 参考信号接收功率（ Reference Signal Received Power , RSRP )、 参考信 号接收质量（ Reference Signal Received Quality , RSRQ )、 以及多组 RS的接收时 间偏差中的一种或多种。
其中 ， RI用于指示 UE建议的空间传输层数； PMI用于指示 UE建议的网络设 备适宜使用的预编码矩阵 ,CQI用于指示 UE建议的调制编码方 Modulation and Coding Scheme ,MCS ) ,RSRP用于指示 UE测量得到的下行 RS的接收功率，RSRQ 用于指示 UE测量得到的下行 RS对应的接收质量（即，下行 RS受到的噪声干扰情 况，例如信干噪比（ Signal to Interference plus Noise Ratio , SINR ) ) ；接收时间 偏差是指 UE收到不同组 RS的接收时间之差，例如 UE通过检测第 1组 RS，获知第 1组 RS到达 UE的时间是 T1 ；通过检测第 2组 RS ,获知第 2组 RS到达 UE的时间是 T2 , UE就可以向网络设备报告多组 RS的接收时间偏差，如上面的例子，则接收 时间偏差即是 T2-T1。 本发明实施例中 ，网络设备可以为基站（ Base Station , BS )、接入点（ Access Point , AP )、 远端无线设备（ Remote Radio Equipment , RRE )、 远端无线端口 ( Remote Radio Head , RRH )、 远端无线单元（ Remote Radio Unit , RRU )、 或中继节点（ Relay node )等。 此外，如果步骤 101中还发送了第二子集对应的一组或多组 RS对应的子集， 本步骤中 ，还接收所述 UE上报的所述第二子集对应的下行 CSI ,其中 ，如果所述 第二子集对应多组 RS，所述第二子集对应的下行 CSI为所述第二子集对应的多组 RS的联合的下行 CSI。 可选地，步骤 102之前，本发明实施例一还可以包括：对于多组 RS中的任一 组 RS ,网络设备向 UE发送该组 RS对应的联合获取信息，联合获取信息可以是： 是否将某一组 RS的测量结果加入到获取联合的下行 CSI中 ，或者是某一组 RS归 属的子集，或者是否根据所有组 RS的测量结果获取所有组 RS的联合的下行 CSI 等，以使 UE根据网络设备为每组 RS发送的联合获取信息，来判断是否需要将该 组 RS的测量结果加入到获取联合的下行 CSI ,或者判断该组 RS归属的子集以获 取该子集的联合的下行 CSI，或者判断是否需要根据所有组 RS的测量结果获取所 有组 RS的联合的下行 CSI。 本发明实施例中 ，网络设备将多组 RS发送给 UE，并接收 UE上报的根据多组 RS的测量结果获取的联合的下行 CSI ,而不是接收 UE上报的通过测量一组 RS获 得的下行 CSI ,从而增强了测量精度。 并且，本发明实施例也可以在网络设备不 增加资源密度选项的情况下提高测量精度，例如不需要增加 CSI-RS的密度，最 小密度仍然维持 5个 ΤΉ一次，也不需要更改现有技术的配置， 因此与现有技术 的设计具有较好的兼容性。
第二方面，本发明另一实施例还提供了一种上报信道状态信息的方法。 本 实施例中是与上述网络设备的实施例相应的 UE侧的方法实施例，可以参照上述 实施例中的描述。 如图 4所述，该方法包括如下步骤。
步骤 401 , UE接收网络设备发送的多组 RS。
本步骤中 ，多组 RS可以是具有不同属性的不同 RS。 一组 RS可以包括至少一 个 RS。
一种示例中 ，属性可以包括： RS的发送周期，同一发送周期内的时间偏移， 和 RS对应的 RE中的一种或多种。例如：所述多组 RS为下列一种或任意组合的多 组 RS:具有不同发送周期的多组 RS、同一发送周期内的具有不同时间偏移的多组 RS和 /或对应不同 RE的多组 RS。
在另一示例中 ，属性还可以包括： RS的类别。类别可以包括 CRS和 CSI-RS。 可选地，步骤 401之前，本发明实施例二还可以包括： UE可以提前接收网络 设备发送的多组 RS的信息；步骤 401中 ，UE根据该多组 RS的信息来接收多组 RS。 其中 ，多组 RS的信息可以包括 RS的发送周期、 RS序列信息、 以及每组 RS对应的 天线端口的数目中的一种或多种等等。
步骤 402 ,测量网络设备发送的多组 RS得到各组 RS对应的测量结果，根据 多组 RS的测量结果获取多组 RS的联合的下行 CSI。
其中 ，下行 CSI可以包括 RI、 PMI、 CQI、 RSRP、 RSRQ、 以及多组 RS的接 收时间偏差中的一种或多种，上述各种下行 CSI的作用可参照实施例一中所述， 此处不再赘述。
需要说明的是，对于上述各种下行 CSI , UE可以对发送的多组 RS的不同的 参数进行测量，从而获得所要上报的联合的下行 CSI ,例如，可以是测量 RS的 SINR ,或者 CQI等。 本发明实施例并不限定对各组 RS进行测量的方法，现有技 术中用于测量 RS的方法均可以应用于本发明实施例。例如 UE使用该 UE上存储的 网络设备发送的 CSI-RS与该 UE接收到的 CSI-RS进行卷积操作以获取 CSI。其中 ， CSI-RS通常是一个序列，例如一个 PRB中包括一个 RE，贝 lj 100个 PRB就对应长度 为 100的 CSI-RS序列。 具体的测量方法属于现有技术，此处不再赘述。
本实施例中 ，UE通过对多组 RS进行测量，并根据所述多组 RS对应的测量结 果获得联合的下行 CSI ,从而能够获取更为精确的下行 CSI。 可选的 ，本实施例中 ，可选的 ，本实施例中 ，所述多组 RS还可以属于第一 子集，其中 ，所述第一子集属于一个集合，所述集合包括至少 2个子集，本申请 中 ，所述集合中除所述第一子集外的所有集合称为第二子集。此时，步骤 301中 ， 所述 UE还接收所述网络设备向所述 UE发送的所述第二子集的一组或多组 RS。当 然，所述 UE也可以不在步骤 401中接收所述网络设备发送的所述第二子集的一组 或多组 RS ,而是在步骤 401之前或之后接收所述第二子集所对应的一组或多组 RSo 相应的，步骤 402中或之前或之后，所述 UE测量所述第二子集的 RS并获得 所述第二子集对应的各组 RS的测量结果，并根据所述第二子集的各组 RS的测量 结果获取第二子集的下行 CSI。其中 ，如果所述第二子集包含多组 RS ,所述第二 子集的下行 CSI为联合的下行 CSI ,如果所述第二子集包含一组 RS ,所述第二子 集的下行 CSI为所述一组 RS的下行 CSI。
与上述实施例相同，本实施例中对 "组"和"子集"的描述，并不一定需要网络 设备或 UE具有"划分组 "或"划分子集"的操作，而是为了便于更清楚的描述。对于 子集和组之间的关系来说，将具有不同特征的 RS作为不同的子集，具有相同特 征的 RS组作为同一子集，其中特征包括发送 RS的物理天线和 /或 RS对应的天线 端口等。 例如：将由不同物理天线发送的 RS组或映射到不同天线端口的 RS组或 者具有其他不同特征的 RS组作为不同的子集，相同特征的 RS组作为同一子集。 而且，下文的实施例中的"组"和"子集"的描述与此相同，不再赘述。
可选的 ，对于多组 RS中的任一组 RS , UE还可以接收网络设备向 UE发送的 子集信息；此时， UE还根据网络设备发送的子集信息，确定所有 RS组与子集的 对应关系，从而根据子集对应的多组 RS的测量结果获取各子集的联合的下行 CSI。
例如，网络设备向 UE发送子集信息为子集数目为 2 ,并向 UE发送 4组 RS，即 该 4组 RS被分为 2个子集，则 UE根据子集信息就能获知：第 1、 2组 RS对应第 1子 集，UE根据第 1、 2组 RS的测量结果获取第 1子集的联合的下行 CSI；第 3、 4组 RS 对应第 2子集， UE根据第 3、 4组 RS的测量结果获取第 2子集的联合的下行 CSI。 此时， UE只需要获知子集信息即可，在获取联合的下行 CSI时，该 UE可根据自 身的规则将 RS组归入不同的子集。例如，UE可以根据所有子集包括的 RS组数目 相同的规则将 RS组归入不同的子集中。 步骤 403 ,所述 UE将获取的所述联合的下行 CSI上报给三四百网络设备。 本步骤中 ，UE可以在上报时刻将获取的联合的下行 CSI上报给网络设备，其 中 ， UE的上报时刻是由网络设备配置的。 具体的上报属于现有技术，此处不再 赘述。
本发明实施例中 ，UE接收网络设备发送的多组 RS ,并向所述网络设备上报 根据所述多组 RS的测量结果获取的联合的下行 CSI ,而不是上报通过测量一组 RS获得的下行 CSI ,从而增强了测量精度。 并且，本发明实施例也可以在网络设 备不增加资源密度选项的情况下提高测量精度，例如不需要增加 CSI-RS的密度， 最小密度仍然维持 5个 ΤΉ一次，也不需要更改现有技术的配置， 因此与现有技 术的设计具有较好的兼容性。
在下文以 CSI为 RSRQ为例对本发明实施例进一步说明 ，此时 UE测量的是各 组 RS对应的 SINR，但需要说明的是，本发明实施例并不限于 CSI为 RSRQ的情况， 对于其他 CSI的实施方式与 RSRQ类似，本文不再赘述。
例如，网络设备在编号为 0的 TTI上发送第 1组 RS，在编号为 2的 TTI上发送第 2组 RS , UE对第 1组和第 2组 RS进行测量得到的 SINR分别为 SINR0和 SINR2 , 当 上报时刻为编号为 4的 ΤΉ时， UE根据第 1组和第 2组 RS对应的测量结果 SINR0和 SINR2获取联合的下行 CSI，例如 UE根据（ SINR0+SINR2 )/2获得联合的下行 CSI , 此时，本步骤中 ， UE在编号为 4的 ΤΉ将该联合联合的下行 CSI ,本示例中为 ( SINR0+SINR2 ) 12 ,上报给网络设备。 进一步地， 当两组 RS为周期性发送， 此时， UE在收到网络设备周期性向 UE发送的两组 RS之后对周期性地该两组 RS 进行测量，并根据两组 RS对应的测量结果获取周期性的联合的下行 CSI ,并周期 性地上报获取的联合的下行 CSI。需要说明的是，当所述网络设备周期性地向 UE 发送的所述多组 RS日寸，所述 UE将所述联合的下行 CSI周期性地上报给所述网络 设备；此时，根据所述多组 RS的所述测量结果获取多组 RS的联合的下行 CSI包 括：所述 UE根据某一上报周期内接收到的所述多组 RS的测量结果获取所述上报 周期内获得的多组 RS的联合的下行 CSI；或者所述 UE根据某一上报周期内接收 到的多组 RS以及所述上报周期之前接收到的所述多组 RS的测量结果获取所述 多组 RS的联合的下行 CSI；或者根据多组 RS中一个上报周期到来时分别在最近 一次接收到的各组 RS的测量结果，所述 UE获取所述多组 RS的联合的下行 CSI。 例如，第 1、 2组 RS的发送周期都为 5个 ΤΉ ,时间偏移分别为 0、 2个 ΤΉ，即，如 图 6所示，网络设备在编号为 0、 5、 10......的 ΤΉ上发送第 1组 RS，在编号为 2、 7、
12 的 ΤΤΙ上发送第 2组 RS , UE就在编号为 0、 2、 5、 7、 10、 12 的 ΤΤΙ上 测量第 1、 2组 RS。例如，UE对多组 RS进行测量得到的 SINR分别为 SINR0、 SINR2、 SINR5、 SINR7...... ,然后， UE周期性地根据这些测量得到的 SINR获取联合的 下行 CSI。 例如，当上报时刻为编号为 4的 ΤΉ时，贝 ljUE根据 SINR0和 SINR2获取 联合的下行 CSI ,例如（ SINR0+SINR2 ) /2。 当上报时刻为编号为 9的 ΤΉ时，则 UE根据 SINR5和 SINR7获取联合的下行 CSI。或者，UE还可以根据 SINRO ,SINR2 , SINR5和 SINR7获取联合的下行 CSI等。
通过本实施例的方法，UE就能通过测量多组 RS，根据多组 RS的测量结果获 取更精确的联合的下行 CSI ,而不是上报通过测量一组 RS获得的下行 CSI ,从而 增强了下行 CSI的测量精度。本发明实施例也可以在 UE不增加资源密度选项的情 况下提高测量精度，例如不需要增加 CSI-RS的密度，最小密度仍然维持 5个 TTI 一次，不需要更改现有技术的配置，因此与现有技术的设计具有较好的兼容性。
可选地，步骤 402之前，本发明实施例二还可以包括：对于多组 RS中的任一 组 RS , UE接收网络设备向 UE发送的该组 RS对应的联合获取信息；联合获取信 息可以是：是否将某一组 RS的测量结果加入到获取联合的下行 CSI中 ，或者是某 一组 RS归属的子集，或者是否根据所有组 RS的测量结果获取所有组 RS的联合的 下行 CSI等；以及， UE根据网络设备为每组 RS发送的联合获取信息，来判断是 否需要将该组 RS的测量结果加入到获取联合的下行 CSI中 ，或者判断该组 RS归 属的子集以获取该子集的联合的下行 CSI，或者判断是否需要根据所有组 RS的测 量结果获取所有组 RS的联合的下行 CSI。
例如，对于每个 RS组，联合获取信息仅包括 1个比特，该联合获取信息为 0 时表示该组 RS不加入获取联合的下行 CSI中 ，为 1则表示该组 RS加入获取联合的 下行 CSI中。 例如，网络设备向 UE发送 3组 RS ,对第 1~3组 RS ,网络设备向 UE发 送联合获取信息分别为 1、 0、 1 ,则 UE仅对根据第 1、 3组 RS的测量结果获取联 合的下行 CSI。
再例如， UE可以把多个 RS组分为多个子集，每个子集例如可以对应不同的 小区，此时，联合获取信息包括 2个比特，该联合获取信息为 00时表示该组 RS 不加入获取联合的下行 CSI中 ，为 01、 10、 11则分别表示该组 RS加入第 1、 2、 3 子集以获取第 1、 2、 3子集的联合的下行 CSI。 例如，网络设备向 UE发送 6组 RS , 对第 1~6组 RS , 网络设备向 UE发送联合获取信息分别为 01、 00、 01、 10、 11、 11，则 UE对根据第 1、 3组 RS的测量结果获取第 1子集的联合的下行 CSI、 测量第 4组 RS来获取第 2子集的下行 CSI、 以及根据第 5、 6组 RS的测量结果获取第 3子集 的联合的下行 CSI。 例如，第 1、 2、 3下行 CSI分别对应小区 1~3。
又例如， UE接收网络设备向 UE发送的值为 1的联合获取信息，表示需要 UE 根据所有组 RS的测量结果获取所有组 RS的联合的下行 CSI。
可选的，本实施例二步骤 402之前，还可以包括： UE接收网络设备在发送所 述多组 RS功率信息时使用的不同功率的功率信息；步骤 402中 ， UE根据该功率 信息和各组 RS对应的测量结果获取联合的下行 CSI。
例如，网络设备使用功率 P1来发送第 1组 RS，使用功率 P2来发送第 2组 RS;UE 接收网络设备向 UE发送的 PI和 P2的信息，其中 ， P1和 P2的信息可以是 P1和 P2 对应的编号，或者 P1和 P2的值等； UE收到之后，根据 Pl、 P2以及第 1、 2组 RS 对应的测量结果获取第 1、 2组 RS的联合的下行 CSI。例如，如果有两组 RS , UE 分别测量这两组 RS对应的 SINR ,例如测量得到的测量结果分别是 SINR1和 SINR2 , 由于两组 RS对应的发送功率不同， 因此如果直接使用这两个 SINR1和 SINR2来确定最终上报的 CQI则会不够准确 ， 例如 ， SINR1对应的是 PlxlHI2/(I+N0) , SINR2对应的是 P2xlHI2/(I+N0) , SINR1和 SINR2的平均值为 (SINRl+SINR2)/2=(Pl+P2)/2xlHI2/(I+N0) ,而如果根据该 SINR1和 SINR2的平均 值来确定 CQI ,这样得到的 CQI不能准确的反映真正的信道衰落和干扰情况， 即 IHI2/(I+N0)；其中 ， H表示下行信道衰落值， I表示下行 RS受到的干扰功率， NO表示噪声方差。 而如果使用上述实施例中的方式， UE可以获取网络设备发 送这两组 RS的功率信息，并结合不同的功率信息获取上报的下行 CSI ,以获取 合理的上报结果 ； 例如 ， UE得到 SINR1和 SINR2之后计算（SINR1/P1+ SINR2/P2)/2 ,就能获得 IHI2/(I+N0) ,根据该结果获取的 CQI就能反映真正的信 道衰落情况。
这里，多组 RS对应的功率信息并不限定为网络设备需要为每组 RS向 UE都发 送一个功率信息，可以只发送部分 RS组对应的功率信息即可。 例如，网络设备 和 UE都预设置第 1组 RS的功率与数据 RE的功率相同 ， 因此就不需发送第 1组 RS 的功率信息，只需要发送其它组 RS的功率信息即可。
可选的 ，本实施例二步骤 402之前，还可以包括：对于某一组 RS , UE接收 网络设备向 UE发送在该组 RS中需要测量的天线端口的信息；测量所述多组 RS 时，所述 UE根据该天线端口信息仅测量该组 RS的天线端口信息对应的天线端口 发送的 RS；
例如，在 CoMP技术中 ，网络设备可以向 UE发送多组 RS ,其中 ，至少其中 1 组 RS对应协作小区，至少另外 1组 RS对应服务小区和协作小区，如图 5所示。 其 中 ，服务小区（如图 5中的小区 1 )表示向 UE发送控制信令的小区， 例如 LTE-A 技术中的物理下行控制信道 (Physical Downlink Control Channel , PDCCH) ,通常 一个 UE只有一个服务小区在为其服务；协作小区 (如图 5中的小区 2)表示除了服 务小区之外的那些向 UE发送数据信号的小区；通过这样对多组 RS的配置，就能 够使网络设备获取协作小区的 CSI、 以及服务小区与协作小区联合对应的 CSI。 例如，网络设备 1发送第 1组 RS和第 2组 RS ,网络设备 2发送第 2组 RS ,网络设备 1 发送的第 2组 RS对应 2个天线端口 ， 网络设备 2发送的第 2组 RS也对应 2个天线端 口 ， 网络设备 1发送的第 2组 RS对应的 2个天线端口不同于网络设备 2发送的第 2 组 RS对应的 2个天线端口 ，这些网络设备都可以向 UE发送数据信号，则此时小 区 1 (协作小区）就有可能单独向 UE发送数据信号，也可以与小区 2 (服务小区） 联合向 UE发送下行数据信号。 为了获得准确的调度，需要 UE反馈： 1、 以只有 网络设备 1向 UE发送数据信号作为假设时的协作小区对应的下行 CSI ; 2、以网络 设备 1与网络设备 2联合向 UE发送数据信号作为假设时的服务小区和协作小区联 合对应的下行 CSI。 因此， 2个网络设备可以向 UE发送 2组 RS ,第 1组 RS包括 2个 天线端口 ，由网络设备 1向 UE发送；第 2组 RS包括 4个天线端口 ，由网络设备 1和 网络设备 2同时向 UE发送，其中网络设备 1使用天线端口 0和 1发送 RS ,网络设备 2使用天线端口 2和 3发送 RS。 这样， UE测量第 1组 RS ,就可以获得网络设备 1对 应的下行 CSI；测量第 2组 RS ,就可以获得网络设备 1和网络设备 2联合向 UE发送 数据时对应的联合的下行 CSI。
在这种情况下，也可以利用这两组 RS来增强对小区 1的 CSI测量的准确性。 例如，UE需要测量网络设备 1对应的 RSRQ ,并可以根据第 1组和第 2组 RS的测量 结果获取网络设备 1对应的联合的下行 RSRQ。但是第 2组 RS只有其中部分天线端 口对应的 RS是由网络设备 1发送的，因此需要向 UE发送用于测量该第 2组 RS的天 线端口信息，以使 UE仅测量目标网络设备对应的天线端口信息中的天线端口对 应的该第 2组 RS。
其中 ，天线端口信息可以包括天线端口数目信息、 或天线端口编号信息、 或天线端口子集信息、 或各天线端口是否被用于测量的信息中的一种或多种。
具体地，天线端口信息包括天线端口数目信息，例如网络设备通知 UE只需 测量第 2组 RS中 2个天线端口对应的某一组 RS ,则 UE仅测量该组 RS对应的所有 4 个天线端口中的前两个天线端口（如，默认测量前 2个天线端口即天线端口 0、1 )； 或者，天线端口信息包括天线端口编号信息，例如通知 UE只需测量第 2组 RS中 编号为 2、 3的天线端口对应的 RS；或者，天线端口信息包括天线端口子集信息， 例如第 2组 RS包括的 4个天线端口被分为 2个天线端口子集，编号为 0、 1的天线端 口即是编号为 0的天线端口子集，编号为 2、 3的天线端口即是编号为 1的天线端 口子集，则网络设备只需将编号为 1的天线端口子集的信息通知 UE ,则 UE仅测 量所有 4个天线端口中编号为 2、 3的天线端口 ；或者，天线端口信息包括各天线 端口是否被用于测量的信息，例如第 2组 RS包括 4个天线端口 ，则网络设备向 UE 发送 4个比特的信息，第 i个比特指示 UE是否测量第 i个天线端口对应的 RS ,例如 该信息为 1100 ,就表示网络设备指示 UE测量第 1、 2个天线端口的 RS。
此外，根据上述描述可以看出 ，本实施例中 ，获取联合的下行 CSI时，不同 组 RS对应的天线端口可以不同 ，因此，UE可以对不同组 RS中的不同天线端口所 发送的 RS进行测量。或者，同一组 RS对应的不同天线端口所发送的 RS归属于不 同子集。
在上面例子中已经说明了 ， UE仅测量第 1组 RS中编号为 0、 1的天线端口和 第 2组 RS中编号为 2、 3的天线端口 ，这里不再赘述。
为了更清楚的理解上述实施例，以下结合附图介绍几种应用示例。
步骤 402中 ，根据多组 RS对应的测量结果获取联合的下行 CSI时，可通过多 种方式实现。 下面介绍几种示例。 示例一
本示例中 ，根据多组 RS对应的测量结果获取联合的下行 CSI可以是对多组 RS对应的测量结果进行线性平均，以获取联合的下行 CSI。
例如，当多组 RS为 2组时， UE测量第 1、 2组 RS得到的测量结果分别为 Al、 A2 ,则对 2组 RS对应的测量结果进行线性的结果即是 (Al+A2)/2。
本发明实施例中 ，多组 RS的测量结果可以是对多组 RS进行单次测量后得到 的测量结果，也可以是对多组 RS分别进行多次测量后，将各组 RS多次测量得到 的测量结果分别进行联合计算之后得到的各组 RS的测量结果。
这里，UE测量第 1、 2组 RS得到的测量结果可以是对第 1、 2组 RS分别进行单 次测量的测量结果；也可以是对第 1、 2组 RS分别进行多次测量，并将第 1、 2组 RS分别对应的多次测量得到的测量结果进行联合计算之后的测量结果。
例如，单次测量可以是如下所述的方法：如图 6所示，假设 UE的上报时间是 编号为 4的 ΤΉ , UE在编号为 0的 ΤΉ测量第 1组 RS得到的测量结果为 A1 ,在编号 为 2的 ΤΉ测量第 2组 RS得到的测量结果为 A2 ,并对 A1和 A2进行线性平均得到的 联合的测量结果即是 (Α1+Α2)/2 ,并根据该测量结果来获取联合的下行 CSI；或 者 UE根据最新接收到的多组 RS的测量结果获取联合的下行 CSI ,例如：假设 UE 的上报时刻是编号为 6的 ΤΉ , UE最新接收到的 2组 RS分别为在编号为 5的 TTI接 收到的第 1组 RS以及在编号为 2的 ΤΉ接收到的第 2组 RS，此时 UE在编号为 5的 TTI 测量第 1组 RS得到的测量结果为 A1，在编号为 2的 ΤΉ测量第 2组 RS得到的测量结 果 A2 ,并对 A1和 A2进行线性平均得到的联合的测量结果即是 (Α1+Α2)/2 ,并根 据该测量结果来获取联合的下行 CSI。
又如，多次测量可以是如下所述的方法：如图 6所示，假设 UE的上报时刻是 编号为 13的 TTI , UE在编号为 0、 5、 10的 TTI测量第 1组 RS并对测量结果进行滤 波得到测量结果 A1 ,在编号为 2、 7、 12的 ΤΉ测量第 2组 RS并进行滤波得到测量 结果 A2 ,并对 A1和 A2进行线性平均得到 (Α1+Α2)/2 ,并根据该线性平均的结果 获取联合的下行 CSI。
示例二
本示例中 ，根据多组 RS对应的测量结果获取联合的下行 CSI可以是对多组 RS对应的测量结果进行不同加权的线性平均，以获取联合的下行 CSI ,其中各组 RS对应的权值可以由网络设备通知给 UE ,或者预设置在网络设备和 UE ,其中 ， 可以根据多组 RS的不同参数为各组 RS设置不同权值。 此处的参数可以是发送功 率、 RS的功率偏差、 以及 RS的发送周期等中的一种或多种。 权值的大小可以通 过仿真和经验等手段来设置，本发明实施例并不限定如何设置权值的大小。
由于不同组 RS的参数不同，因此通过根据不同组 RS的参数为不同组 RS设置 不同的权值，使得各组 RS对应的测量结果对最终得到的联合的下行 CSI的贡献是 不同的 ， 因此在本示例中使用不同的权值对不同组 RS的测量结果进行加权来获 取最终联合的下行 CSI。 例如，对于 2组 RS的情况，如果通过上述任一种测量方 法得到的 2组 RS的测量结果分别为 A1和 A2 ,在本实施例中进行不同加权的线性 平均的结果为（mlxAl+m2xA2)/(ml+m2) ,其中 ， ml和 m2就表示第 1、 2组 RS分 别对应的权值，并且 ml不等于 m2。例如第 1组 RS的功率是第 2组 RS的功率的 2倍， 则可以设置 ml=2 , m2=l。
优选地， ml和 m2的值的信息可以由网络设备发送给 UE，这样可以获得灵活 性。 此处 ml和 m2的值的信息可以是 ml和 m2的值的编号，此时， UE和网络设备 中预设置了 ml和 m2的值的编号与 ml和 m2的值的对应关系。当然 ml和 m2的值的 信息可以不限于是 ml和 m2的值的编号，例如还可以是发送 ml和 m2的值等。
或者，ml和 m2的值的信息也可以通过预设置不同组 RS对应的参数与权值的 映射表而预设置在网络设备和 UE中 ，即存储在网络设备和 UE，当网络设备向 UE 发送 RS组对应的参数，则 UE就可以根据该参数与预设置的映射表来获取权值。
例如，网络设备和 UE预设置有如表 1所示的映射关系：
表 1
Figure imgf000019_0001
基于上述表 1的情况，如果网络设备向 UE通知第 1组 RS的功率偏差信息为 3dB (即 RS对应的 RE的功率是数据 RE的功率的 2倍） ，则 UE就可以通过表 1获知 第 1组 RS对应的权值为 2；如果网络设备向 UE通知第 2组 RS的功率偏差信息为 OdB (即 RS对应的 RE的功率与数据 RE的功率相同） ，则 UE就可以通过表 1获知 第 2组 RS对应的权值为 1。 这种方式的好处在于不需要专门用于通知这些权值的 信令，能降低信令开销。
再例如， 当 RS组的参数是 RS的发送周期时，如果第 1组 RS的发送周期为 10 个 ΤΉ，第 2组 RS的发送周期为 5个 ΤΉ ,由于第 2组的 RS的密度比第 1组 RS的密度 更大，可靠性就更高，则第 1组 RS的权值为 1/4；第 2组 RS的权值为 1/2。 其中 ， 发送周期与权值的对应关系同样可以是预设置的。
示例三
本示例中 ， UE接收的多组 RS是网络设备周期性地向 UE发送的多组 RS； UE周期性地上报联合的下行 CSI。
根据多组 RS对应的测量结果获取联合的下行 CSI可以是 UE在每次收到多组 RS中的任一组 RS在某一发送周期发送的该组 RS之后 本次收到的该组 RS进行 测量，并对本次得到的测量结果与之前对多组 RS进行滤波得到的滤波结果进行 滤波，从而获取联合的下行 CSI。 其中 ，滤波因子可以预设置在 UE和网络设备， 也可以由网络设备通过向 UE发送信令来通知 UE该滤波因子。
具体的 ，通常网络设备周期性地发送一组下行 RS。 在现有技术中 ，UE每次 测量之后可以通过式（ 1 )对测量结果进行滤波，从而增强测量的精度：
M_new = (l-Filter_factor)xM_old + Filter_factorxM_mea ( 1 ) 其中 ， M_mea表示当前测量获得的 CSI测量结果， M_old表示当前测量之前 的滤波结果，M_new表示对当前测量的结果进行滤波之后得到的新的滤波结果， Filter_factor表示滤波因子，通常是一个在 0和 1之间取值的数。
使用了本发明实施例之后，每次测量收到的不同组 RS中的任一组 RS之后， 就使用测量结果、 根据公式（ 1 )来获取新的滤波结果，此时得到的滤波结果为 对多组 RS—起进行滤波得到的滤波结果。 例如，在编号为 5之前的 TTI中得到的 多组 RS的滤波结果为 M_old ,则 UE在编号为 5的 ΤΉ收到第 1组 RS在本发送周期 发送第 1组 RS之后 ， 通过测量获得测量结果^1_1^ 1 , 并根据 M_newl = (l-Filter_factor)xM_old + Filter_factorxM_meal来获取滤波之后的结果；当 UE在 编号为 7的 TTI收到第 2组 RS在本发送周期发送第 2组 RS之后 ，通过测量获得 M_mea2 , 从 而 就 根 据 M_new2 = (1 -Filter—factor) xM_newl + Filter_factorxM_mea2来获取滤波之后的结果。 其中 ，滤波因子可以预设置在 UE 和网络设备，也可以由网络设备通过向 UE发送信令来通知该滤波因子。 由该示 例可以看出，本示例中的滤波结果是将多组 RS—起进行滤波，从而根据多组 RS 的测量结果获取多组 RS的联合的下行 CSI。
之后， UE可以根据所述多组 RS的滤波结果获取上报的联合的下行 CSI ,例 如，如果上报的下行 CSI为 RSRQ , M_new表示 SINR ,因此就可以直接在上报时 刻将 M_new作为 RSRQ上报给网络设备。 或者，如果上报的 CSI为 CQI ,就可以 根据 M_new来确定上报的 CQI ,在上报时刻将确定的 CQI上报给网络设备。
上述示例中 ，还可以为不同组 RS设置不同的滤波因子，其中各组 RS对应的 滤波因子可以由网络设备通知给 UE ,或者将各组 RS对应的滤波因子预设置在网 络设备和 UE ,其中 RS组的不同参数对应不同滤波因子。 其中 ，滤波因子的设置 可以参照上述进行不同加权的线性平均时所用的权值的设置，此处不再赘述。 在本发明实施例中使用不同的滤波因子分别对不同组 RS的测量结果进行滤波， 能获得更精确的结果。
例如在编号为 4的 ΤΉ滤波之后的滤波结果为^1_01(1 ,则 UE在编号为 5的 ΤΉ 收到第 1组 RS之后 ， 通过测量获得 M_meal , 从而就根据 M_newl = (1 -Filter_factor 1 )xM_old + Filter_factorlxM_meal来获取滤波之后的滤波结果；当 UE在编号为 7的 TTI收到第 2组的 RS之后，通过测量获得 M_mea2 ,从而就根据 M_new2 = ( 1 -Filter_factor2)xM_new 1 + Filter_factor2xM_mea2来获取滤波之后的 滤波结果。 具体地，例如第 1组 RS的发送功率比第 2组 RS的发送功率要高，则设 置 Filter—factor 1=1/2 , Filter_factor2=l/4。
关于不同 RS组的滤波因子， 可以由网络设备通知，或者预设置在网络设备 和 UE ,具体实施例类似前面的权值实施例，这里不再赘述。
第三方面，发明一实施例提供了一种网络设备 70 ,所述网络设备 70用于执 行上述网络设备的上报下行 CSI的方法，本实施例只对该网络设备的结构进行简 单说明 ，具体原理可以结合参见方法实施例所述。 如图 8所示，所述网络设备 70 包括发送模块 701和接收模块 702。
发送模块 701 ,用于向 UE发送多组参考信号 RS；以及 接收模块 702，用于接收所述 UE向所述网络设备 70上报的联合的下行信道状 态信息 CSI ,其中 ，所述联合的下行 CSI为所述 UE对所述多组 RS测量后根据所述 多组 RS的测量结果获取的所述多组 RS的联合的下行 CSI。
本发明实施例中 ，网络设备 70将多组 RS发送给 UE ,并接收 UE上报的根据多 组 RS的测量结果获取的联合的下行 CSI ,而不是接收 UE上报的通过测量一组 RS 获得的下行 CSI ,从而增强了测量精度。 并且，本发明实施例也可以在网络设备 70不增加资源密度选项的情况下提高测量精度，例如不需要增加 CSI-RS的密度， 最小密度仍然维持 5个 ΤΉ一次，也不需要更改现有技术的配置， 因此与现有技 术的设计具有较好的兼容性。
进一步地，所述发送模块 701 ,还用于在向 UE发送多组参考信号 RS之前向 所述 UE发送多组 RS的信息，以使 UE根据所述多组 RS的信息来接收所述多组 RS , 其中所述多组 RS的信息包括 RS的发送周期、 RS序列信息、以及每组 RS包括的天 线端口的数目中的一种或多种。
进一步地，所述发送模块 701，还用于向所述 UE发送所述网络设备 70在发送 所述多组 RS时使用的功率信息，以使所述 UE根据所述功率信息以及所述多组 RS 对应的测量结果获取所述联合的下行 CSI。
进一步地，所述发送模块 701 ,还用于对于某一组 RS , 向所述 UE发送天线 端口信息，其中 ，所述天线端口信息为所述多组 RS中一组 RS的需要测量 RS的天 线端口的信息，以使所述 UE根据所述天线端口信息测量相应的天线端口所发送 的所述 RS。
进一步地，所述发送模块 701 ,还用于向所述 UE发送任一组 RS对应的联合 获取信息，其中 ，所述联合获取信息用于指示：是否将所述任一组 RS的测量结 果加入到获取所述联合的下行 CSI中 ，或者是否根据所有组 RS的测量结果获取所 有组 RS的联合的下行 CSI。
进一步地，所述发送模块 701具体用于，发送属于第一子集的所述多组 RS , 其中 ，所述第一子集属于一个集合；
所述发送模块 701还用于， 向所述 UE发送第二子集对应的一组或多组 RS , 所述第二子集也属于所述集合； 所述接收模块 702还用于，接收所述 UE向所述网络设备 70上报的所述第二子 集的下行 CSI ,其中 ，如果所述第二子集包含多组 RS ,所述第二子集的下行 CSI 为所述第二子集对应的多组 RS的联合的下行 CSI。
进一步地，所述发送模块 701 ,还用于向所述 UE发送子集信息或者向所述 UE发送联合获取信息，以使所述 UE根据所述子集信息，或者，根据所述联合获 取信息，确定任一组 RS归属的子集，
其中 ，所述子集信息包括所述第一子集和所述第二子集所包含的各组 RS的 信息；所述联合获取信息包括所述任一组 RS归属的子集的信息。
o
本实施例中 ，所述下行 CSI包括 RI、 PMI、 CQI、 RSRP、 RSRQ ,以及多组 RS的接收时间偏差中的一种或多种。
本实施例中 ，所述网络设备 70为 BS、 AP、 RRE、 RRH、 RRU、 或中继节点。 此外，本实施例仅仅对本发明实施例相关的模块进行了描述， 当然并不仅 限于这些模块或本发明实施例提供的模块划分方式，例如，所述发送模块 701和 所述接收模块 702可以是同一个部件，如收发器，也可以是两个部件。 此外，本 实施例还可以包括其他模块，例如所述发送模块 701和所述接收模块 702可以通 过一个处理模块连接，用于根据所述接收模块 702接收到的所述下行的联合 CSI 进行相关处理，或者用于指示所述发送模块 701发送相关信息等。
由于本实施例可以执行上述网络设备的上报下行 CSI的方法的各个步骤，因 此，详细内容可以参照上述两个方法实施例中的描述，并且本实施例能够获得 的效果也可以参照上述方法实施例中的描述，此处不再赘述。 此外，本实施例 中的"组"、 "集合 "以及 "子集 "也并不一定具有划分组、 划分集合或子集的操作， 详见上述实施例中的描述。
第四方面，本发明一实施例提供了一种用户设备 80 ,所述用户设备 80可以 用于执行上述用户设备 80的上报下行 CSI的方法，本实施例只对该用户设备 80的 结构进行简单说明 ，具体原理可以结合参见方法实施例所述。 如图 9所示，所述 用户设备 80包括接收模块 801 ,获取模块 802 ,以及发送模块 803。
接收模块 801，用于接收网络设备发送的多组参考信号 RS，并向获取模块 802 传输所述多组 RS；
所述获取模块 802 ,用于测量所述接收模块 801传输的所述多组 RS ,得到各 组 RS的测量结果，根据所述各组 RS的所述测量结果获取所述多组 RS的联合的下 行信道状态信息 CSI ,并向发送模块 803传输所述联合的下行 CSI；以及
所述发送模块 803 ,用于将所述获取模块 802传输的所述联合的下行 CSI上报 给所述网络设备。
本发明实施例中 ，UE接收的是网络设备发送的多组 RS ,并上报的根据所述 多组 RS的测量结果获取的联合的下行 CSI ,而不是上报通过测量一组 RS获得的 下行 CSI ,从而增强了测量精度。 并且，本发明实施例也可以在网络设备不增加 资源密度选项的情况下提高测量精度，例如不需要增加 CSI-RS的密度，最小密 度仍然维持 5个 ΤΉ一次，也不需要更改现有技术的配置， 因此与现有技术的设 计具有较好的兼容性。
进一步地，所述获取模块 802具体用于，对所述多组 RS对应的测量结果进行 线性平均，获取所述多组 RS的所述联合的下行 CSI；或者，对所述多组 RS对应 的测量结果进行加权线性平均，获取所述多组 RS的所述联合的下行 CSI。
进一步地，所述获取模块 802具体用于，根据所述接收模块 801从所述网络 设备接收的各组 RS的权值对所述多组 RS对应的测量结果进行加权线性平均，其 中 ，所述权值为所述网络设备是根据所述多组 RS的不同参数为所述多组 RS设置 的，所述参数包括发送功率、 RS的功率偏差、 以及 RS的发送周期中的一种或多 种；或者
如图 9所示，所述用户设备 80还包括：存储模块 802a ,用于存储所述多组 RS 的不同参数，其中 ，所述参数包括发送功率、 RS的功率偏差、 以及 RS的发送周 期中的一种或多种；所述获取模块 802具体用于，从所述存储模块 802a获取多组 RS的不同参数，根据所述多组 RS的不同参数为各组 RS设置的所述不同权值，对 所述多组 RS对应的测量结果进行加权线性平均。
进一步地，所述接收模块 801具体用于，接收所述网络设备周期性地向 UE 发送的所述多组 RS；
所述发送模块 803具体用于，将所述联合的下行 CSI周期性地上报给所述网 络设备；
所述获取模块 802具体用于，根据一个上报周期内所述接收模块 801接收到 的所述多组 RS的测量结果获取所述上报周期内获得的多组 RS的联合的下行 CSI；或者根据所述上报周期内所述接收模块 801接收到的接收到的多组 RS以及 所述上报周期之前接收到的所述多组 RS的测量结果获取所述多组 RS的联合的 下行 CSI；或者根据多组 RS中所述上报周期的最近一次所述接收模块 801接收到 的接收到的各组 RS的测量结果获取所述多组 RS的联合的下行 CSI。
进一步地，所述接收模块 801具体用于，接收所述网络设备周期性地向 UE 发送的所述多组 RS；
所述发送模块 803具体用于，将所述联合的下行 CSI周期性地上报给所述网 络设备；
所述获取模块 802具体用于，在每次通过所述接收模块 801接收到多组 RS中 的一组 RS在一个上报周期内发送的该组 RS之后，对本次接收到的所述一组 RS进 行测量，并对本次得到的所述一组 RS的测量结果与之前对所述多组 RS进行滤波 得到的滤波结果进行滤波，获取所述多组 RS的联合的下行 CSI。
进一步地，所述获取模块 802具体用于，根据不同组 RS对应的不同的滤波因 子，对本次得到的所述一组 RS的测量结果与之前对所述多组 RS进行滤波得到的 滤波结果进行滤波，其中 ，
所述不同组 RS对应的滤波因子是通过所述接收模块 801从所述网络设备接 收的 ，其中 ，所述滤波因子是所述网络设备根据所述多组 RS的不同参数为不同 组 RS设置的，或者，
所述用户设备 80还包括存储模块 802a ,用于存储所述多组 RS的不同参数； 所述不同组 RS对应的滤波因子是所述获取模块 802根据所述存储模块 802a存储 的所述多组 RS的不同参数为各组 RS设置的，
其中 ，所述参数包括发送功率， RS的功率偏差，以及 RS的发送周期。
进一步地，所述接收模块 801 ，还用于接收所述网络设备在发送所述多组 RS 时使用的功率信息，并将所述功率信息传输给所述获取模块 802；
所述获取模块 802具体用于，根据所述功率信息以及所述多组 RS的所述测量 结果获取多组 RS的联合的下行 CSI。
进一步地，所述接收模块 801，还用于接收所述网络设备向所述 UE发送的天 线端口信息，并将所述天线端口信息传输给所述获取模块 802，其中 ，所述天线 端口信息为所述多组 RS中某一组 RS的需要测量 RS的天线端口信息；
所述获取模块 802具体用于，对于所述某一组 RS，根据所述天线端口信息测 量所述一组 RS对应的相应的天线端口所发送的 RS；
其中 ，所述天线端口信息包括天线端口数目信息、 天线端口编号信息、 和 各天线端口是否被用于测量的信息中的一种或多种。
进一步地，所述接收模块 801 ，还用于接收所述网络设备在发送所述多组 RS 之前向 UE发送多组 RS的信息；其中 ，所述多组 RS的信息包括 RS的发送周期、 RS序列信息、 每组 RS包括的天线端口数目中的一种或多种；
所述接收模块 801具体用于，根据所述多组 RS的信息接收所述多组 RS。
进一步地，所述接收模块 801还用于，接收所述网络设备向所述 UE发送的联 合获取信息，并将所述联合获取信息传输给所述获取模块 802；
所述获取模块 802还用于，根据所述联合获取信息，判断是否需要将一组 RS 的测量结果加入到获取所述联合的下行 CSI中 ，或者判断是否需要根据所有组 RS 的测量结果获取所述联合的下行 CSI。
进一步地，所述接收模块 801具体用于，接收属于第一集合的所述多组 RS； 其中 ，所述第一子集属于一个集合； 所述接收模块 801还用于，接收所述网络设备发送的所述第二子集的一组或 多组 RS ,并将所述第二子集的一组或多组 RS传输给所述获取模块 802；
所述获取模块 802还用于，测量所述接收模块 801接收的所述第二子集的一 组或多组 RS得到所述第二子集的各组 RS的测量结果，并根据所述第二子集的各 组 RS的测量结果获取所述第二子集的下行 CSI ,并将所述第二子集的下行 CSI传 输给所述发送模块 803；其中 ，如果所述第二子集包含多组 RS ,所述第二子集的 下行 CSI为所述第二子集的多组 RS的联合的下行 CSI；
所述发送模块 803还用于， 向所述网络设备发送所述获取模块 802传输的所 述所述第二子集的下行 CSI。 进一步地，所述接收模块 801，还用于接收所述网络设备向 UE发送的子集信 息，或者，接收所述网络设备向所述 UE发送的联合获取信息，并将所述子集信 息或者所述联合获取信息传输给所述获取模块 802；
所述获取模块 802 ,还用于根据所述接收模块 801传输的所述子集信息，或 者，根据所述联合获取信息，确定任一组 RS归属的子集，其中 ，所述子集信息 包括所述第一子集和所述第二子集所包含的各组 RS的信息；所述联合获取信息 包括所述任一组 RS归属的子集的信息。
进一步地，所述接收模块 801，还用于接收所述网络设备向所述 UE发送的天 线端口信息，其中 ，所述天线端口信息包括天线端口子集信息；
所述获取模块 802具体用于，根据所述天线端口信息测量一组 RS的相应的天 线端口所发送的 RS ,并确定所述天线端口所发送的 RS所归属的子集。
由于本实施例可以执行上述用户设备的上报下行 CSI的方法的各个步骤，因 此，详细内容可以参照上述两个方法实施例中的描述，并且本实施例能够获得 的效果也可以参照上述方法实施例中的描述，此处不再赘述。 此外，本实施例 中的"组"、 "集合 "以及 "子集 "也并不一定具有划分组、 划分集合或子集的操作， 详见上述实施例中的描述。
第五方面，本发明一实施例提供了一种上报信道状态信息的系统，所述系 统包括上述实施例提供的用户设备 80以及上述实施例提供的网络设备 70 ,具体 参见上述实施例中的描述，此处不再赘述。 其中 ，所述用户设备 80可以用于执 行上述用户设备的上报下行 CSI的方法，所述网络设备 70可以用于执行上述网络 设备的上报下行 CSI的方法，具体原理可以结合参见方法实施例所述。 并且可以 取得的技术效果也可以参见上述实施例所述。
需要说明的是，以上用户设备和网络设备的实施例中 ，各功能模块的划分 仅是举例说明 ，实际应用中可以根据需要，例如相应硬件的配置要求或者软件 的实现的便利考虑，而将上述功能分配由不同的功能模块完成，即将所述用户 设备或网络设备的内部结构划分成不同的功能模块，以完成以上描述的全部或 者部分功能。 而且，实际应用中 ，上述实施例中的相应的功能模块可以是由相 应的硬件实现，也可以由相应的硬件执行相应的软件完成，例如，前述的网络 设备的发送模块，可以是具有执行前述向 UE发送多组 RS的硬件，例如发送器， 也可以是能够执行相应计算机程序从而完成前述功能的一般处理器或者其他硬 件设备；再如前述的网络设备的接收模块，可以是具有执行前述用于接收所述
UE对所述多组 RS测量并根据多组 RS的测量结果获取多组 RS的联合的 CSI之后 向所述网络设备上报的联合的下行信道状态信息 CSI的硬件，例如接收器，也可 以是能够执行相应计算机程序从而完成前述功能的一般处理器或者其他硬件设 备，例如天线，也可以是能够执行相应计算机程序从而完成前述功能的一般处 理器或者其他硬件设备；前述的用户设备的接收模块和发送模块与网络设备的 接收模块和发送模块类似，此处不再赘述；前述的 CSI获取模块，可以是具有执 行前述用于执行前述向分别测量所述接收模块接收的所述多组 RS ,得到各组 RS 的测量结果，并根据所述测量模块得到的各组 RS的所述测量结果获取多组 RS的 联合的下行 CSI的硬件，例如处理器，也可以是能够执行相应计算机程序从而完 成前述功能的一般处理器或者其他硬件设备（本说明书提供的各个实施例都可 应用上述描述原则）。 本领域普通技术人员可以理解上述实施例的各种方法中的全部或部分步骤 是可以通过程序来指令相关的硬件来完成，该程序可以存储于一计算机可读存 储介质中 ，存储介质可以包括：只读存储器（ ROM , Read Only Memory )、 随 机存取存储器（ RAM , Random Access Memory )、 磁盘或光盘等。
以上对本发明实施例提供的上报信道状态信息方法、 用户设备和网络设备 进行了详细介绍，本文中应用了具体个例对本发明的原理及实施方式进行了阐 述，以上实施例的说明只是用于帮助理解本发明的方法及其核心思想； 同时， 对于本领域的一般技术人员 ，依据本发明的思想，在具体实施方式及应用范围 上均会有改变之处，综上所述，本说明书内容不应理解为对本发明的限制。

Claims

权 利 要 求
1、 一种上报信道状态信息的方法，其特征在于，所述方法包括： 用户设备 UE接收网络设备发送的多组参考信号 RS；
测量所述多组 RS得到各组 RS的测量结果，根据所述多组 RS的所述测量结 果获取所述多组 RS的联合的下行信道状态信息 CSI；以及
将所述联合的下行 CSI上报给所述网络设备。
2、 如权利要求 1所述的方法，其特征在于，所述根据所述多组 RS的所述 测量结果获取所述多组 RS的联合的下行 CSI ,包括：
对所述多组 RS对应的测量结果进行线性平均，获取所述多组 RS的所述联 合的下行 CSI；或者
对所述多组 RS对应的测量结果进行加权线性平均，获取所述多组 RS的所 述联合的下行 CSI。
3、 如权利要求 2所述的方法，其特征在于，所述对所述多组 RS对应的测 量结果进行加权线性平均中 ，
所述多组 RS对应的权值是所述 UE根据所述多组 RS的不同参数为各组 RS 设置的；或者，
所述多组 RS对应的权值是通过信令从所述网络设备接收的，其中 ，所述 多组 RS对应的权值是所述网络设备根据所述多组 RS的不同参数为所述多组 RS设置的 ，
其中 ，所述参数包括发送功率、 RS的功率偏差、 以及 RS的发送周期中的 一种或多种。
4、 如权利要求 1至 3中任一项所述的方法，其特征在于，
所述 UE接收所述网络设备发送的多组 RS ,包括：所述 UE接收所述网络 设备周期性地向 UE发送的所述多组 RS；
所述将所述联合的下行 CSI上报给所述网络设备，包括：所述 UE将所述 联合的下行 CSI周期性地上报给所述网络设备；
所述根据所述多组 RS的所述测量结果获取所述多组 RS的联合的下行 CSI ,包括：所述 UE根据一个上报周期内接收到的所述多组 RS的测量结果获 取所述上报周期内获得的所述多组 RS的联合的下行 CSI；或者所述 UE根据所 述上报周期内接收到的多组 RS以及所述上报周期之前接收到的所述多组 RS 的测量结果获取所述多组 RS的联合的下行 CSI；或者所述 UE根据多组 RS中所 述上报周期的最近一次接收到的各组 RS的测量结果获取所述多组 RS的联合 的下行 CSI。
5、 如权利要求 1至 3中任一项所述的方法，其特征在于，
所述 UE接收所述网络设备发送的多组 RS ,包括：所述 UE接收所述网络 设备周期性地向 UE发送的所述多组 RS；
所述将所述联合的下行 CSI上报给所述网络设备，包括：所述 UE将所述 联合的下行 CSI周期性地上报给所述网络设备；
所述根据所述多组 RS的所述测量结果获取所述多组 RS的联合的下行 CSI ,包括：对一个上报周期内在一次收到的一组 RS进行测量，并对本次得 到的所述一组 RS的测量结果与最近一次得到的所述多组 RS的滤波结果进行 滤波，获取所述多组 RS的联合的下行 CSI。
6、 如权利要求 5所述的方法，其特征在于，
所述对本次得到的所述一组 RS的测量结果与最近一次得到的所述多组 RS的滤波结果进行滤波中 ，不同组 RS对应不同的滤波因子，其中 ，
所述不同组 RS对应的滤波因子是所述 UE根据所述多组 RS的不同参数为 各组 RS设置的；或者，
所述不同组 RS对应的滤波因子是所述 UE从所述网络设备接收的，其中 ， 所述网络设备根据所述多组 RS的不同参数为所述多组 RS设置的 ，
其中 ，所述参数包括发送功率， RS的功率偏差，以及 RS的发送周期。
7、如权利要求 1至 6中任一项所述的方法，其特征在于，测量所述多组 RS 之前，所述方法还包括：所述 UE接收所述网络设备在发送所述多组 RS时使用 的功率信息；
所述根据所述多组 RS的所述测量结果获取所述多组 RS的联合的下行 CSI ,包括：根据所述功率信息以及所述多组 RS的所述测量结果获取多组 RS 的联合的下行 CSI。
8、如权利要求 1至 7中任一项所述的方法，其特征在于，测量所述多组 RS 之前，所述方法还包括：所述 UE接收所述网络设备向所述 UE发送的天线端口 信息，其中 ，所述天线端口信息为所述多组 RS中某一组 RS需要测量的 RS的天 线端口的信息；
对于所述某一组 RS ,所述测量所述多组 RS中 ，所述 UE根据所述天线端 口信息测量所述某一组 RS对应的相应的天线端口所发送的 RS ,
其中 ，所述天线端口信息包括天线端口数目信息、 天线端口编号信息、 以及各天线端口是否被用于测量的信息中的一种或多种。
9、 如权利要求 1至 8中任一项所述的方法，其特征在于，所述 UE接收网 络设备发送的多组 RS之前，所述方法还包括：所述 UE接收所述网络设备向所 述 UE发送的多组 RS的信息；其中 ，所述多组 RS的信息包括 RS的发送周期、 RS序列信息、 以及每组 RS对应的天线端口的数目中的一种或多种；
所述 UE接收网络设备发送的多组 RS ,包括：所述 UE根据所述多组 RS的 信息接收所述多组 RS。
10、 如权利要求 1或 9中任一项所述的方法，其特征在于，所述多组 RS是 具有不同属性的不同 RS；所述多组 RS为相同类别的多组 RS或不同类别的多组 RS ,其中 ，
所述属性包括： RS的发送周期，同一发送周期内的时间偏移，和 RS对应 的资源单元 RE中的一种或多种。
11、 如权利要求 10所述的方法，其特征在于，所述类别包括公共参考信 号 CRS和 CSI-RS。
12、 如权利要求 1至 11中任一项所述的方法，其特征在于，所述根据所述 多组 RS的所述测量结果获取多组 RS的联合的下行 CSI前，所述方法还包括： 所述 UE接收所述网络设备向所述 UE发送的联合获取信息，并根据所述联 合获取信息，判断是否需要将一组 RS的测量结果加入到获取所述联合的下行 CSI中 ，或者判断是否需要根据所有组 RS的测量结果获取所述联合的下行 CSI。
13、 如权利要求 1至 11中任一项所述的方法，其特征在于，所述多组 RS 属于第一子集，所述第一子集属于一个集合，所述集合还包括第二子集； 所述方法还包括：
所述 UE接收所述网络设备发送的所述第二子集的一组或多组 RS； 所述 UE测量所述第二子集的一组或多组 RS得到所述第二子集的各组 RS 的测量结果，并根据所述第二子集的各组 RS的测量结果获取所述第二子集的 下行 CSI；其中 ，如果所述第二子集包含多组 RS ,所述第二子集的下行 CSI为 所述第二子集的多组 RS的联合的下行 CSI；以及
向所述网络设备上报的所述第二子集的下行 CSI。
14、 如权利要求 13所述的方法，其特征在于，所述根据所述多组 RS的所 述测量结果获取多组 RS的联合的下行 CSI前，以及所述根据所述第二子集的 各组 RS的测量结果获取所述第二子集的下行 CSI前，所述方法还包括：
所述 UE接收所述网络设备向 UE发送的子集信息，或者，所述 UE接收所 述网络设备向所述 UE发送的联合获取信息；以及
根据所述子集信息，或者，根据所述联合获取信息，确定任一组 RS归属 的子集，
其中 ，所述子集信息包括所述第一子集和所述第二子集所包含的各组 RS 的信息；所述联合获取信息包括所述任一组 RS归属的子集的信息。
15、 如权利要求 13或 14所述的方法，其特征在于，测量所述第一子集的 所述多组 RS之前，以及测量所述第二子集的一组或多组 RS之前，所述方法还 包括：所述 UE接收所述网络设备向所述 UE发送的天线端口信息；所述天线端 口信息包括天线端口子集信息；
测量所述第一子集的所述多组 RS ,以及测量所述第二子集的一组或多组 RS ,包括：所述 UE根据所述天线端口子集信息测量一组 RS的相应的天线端 口所发送的 RS ,并确定所述天线端口所发送的 RS所归属的子集。
16、 一种上报信道状态信息的方法，其特征在于，所述方法包括： 网络设备向用户设备 UE发送多组参考信号 RS；以及
接收所述 UE向所述网络设备上报的联合的下行信道状态信息 CSI ,其中 ， 所述联合的下行 CSI为所述 UE对所述多组 RS测量后根据所述多组 RS的测量 结果获取的所述多组 RS的联合的下行 CSI。
17、 如权利要求 16所述的方法，其特征在于，所述多组 RS是具有不同属 性的不同 RS ,所述多组 RS为相同类别的多组 RS或不同类别的多组 RS ,其中 ， 所述属性包括： RS的发送周期，同一发送周期内的时间偏移，和 RS对应 的资源单元 RE中的一种或多种。
18、 如权利要求 17所述的方法，其特征在于，所述类别包括公共参考信 号 CRS和 CSI-RS。
19、 如权利要求 16或 17或 18所述的方法，其特征在于，所述网络设备向 UE发送多组参考信号 RS之前，所述方法还包括：
所述网络设备向所述 UE发送所述多组 RS的信息，以使所述 UE根据所述 多组 RS的信息接收所述多组 RS，其中所述多组 RS的信息包括 RS的发送周期、 RS序列信息、 以及每组 RS对应的天线端口的数目中的一种或多种。
20、 如权利要求 16至 19中任一项所述的方法，其特征在于，接收所述 UE 向所述网络设备上报的联合的下行 CSI之前，所述方法还包括：所述网络设备 向所述 UE发送所述网络设备在发送所述多组 RS时使用的功率信息，以使所述 UE根据所述功率信息以及所述多组 RS对应的测量结果获取所述联合的下行 CSI。
21、 如权利要求 16至 20中任一项所述的方法，其特征在于，接收所述 UE 向所述网络设备上报的联合的下行 CSI之前，所述方法还包括：所述网络设备 向所述 UE发送天线端口信息，其中 ，所述天线端口信息为所述多组 RS中一组 RS的需要测量 RS的天线端口信息，以使所述 UE根据所述天线端口信息测量 相应的天线端口所发送的所述 RS。
22、 如权利要求 16至 21中任一项所述的方法，其特征在于，所述网络设 备向 UE发送所述第一子集的所述多组 RS之前，所述方法还包括：
所述网络设备向所述 UE发送联合获取信息，其中 ，所述联合获取信息用 于指示：是否将一组 RS的测量结果加入到获取联合的下行 CSI中 ，或者是否 根据所有组 RS的测量结果获取所有组 RS的联合的下行 CSI。
23、 如权利要求 16至 21中任一项所述的方法，其特征在于，
所述多组 RS属于第一子集，所述第一子集属于一个集合，所述集合还包 括第二子集；
所述方法还包括：
所述网络设备向所述 UE发送第二子集的一组或多组 RS；
接收所述 UE向所述网络设备上报的所述第二子集的下行 CSI，其中 ，如 果所述第二子集包含多组 RS ,所述第二子集的下行 CSI为所述第二子集对应 的多组 RS的联合的下行 CSI。
24、 如权利要求 22所述的方法，其特征在于，所述接收所述 UE向所述网 络设备上报的联合的下行 CSI之前，以及所述接收所述 UE向所述网络设备上 报的所述第二子集的下行 CSI之前，所述方法还包括：
所述网络设备向所述 UE发送的子集信息，或者所述网络设备向所述 UE 发送联合获取信息，以使所述 UE根据所述子集信息或所述联合获取信息确定 任一组 RS归属的子集，其中 ，所述子集信息包括所述第一子集和所述第二子 集所包含的各组 RS的信息；所述联合获取信息包括所述任一组 RS归属的子集 的信息
25、 一种用户设备，其特征在于，所述用户设备包括：
接收模块，用于接收网络设备发送的多组参考信号 RS ,并向获取模块传 输所述多组 RS；
所述获取模块，用于测量所述接收模块传输的所述多组 RS ,得到各组 RS 的测量结果，根据所述各组 RS的所述测量结果获取所述多组 RS的联合的下行 信道状态信息 CSI ,并向发送模块传输所述联合的下行 CSI；以及
所述发送模块，用于将所述获取模块传输的所述联合的下行 CSI上报给所 述网络设备。
26、 如权利要求 25所述的用户设备，其特征在于， 所述获取模块具体用于，对所述多组 RS对应的测量结果进行线性平均， 获取所述多组 RS的所述联合的下行 CSI；或者，对所述多组 RS对应的测量结 果进行加权线性平均，获取所述多组 RS的所述联合的下行 CSI。
27、 如权利要求 26所述的用户设备，其特征在于，
所述获取模块具体用于，根据所述接收模块从所述网络设备接收的各组
RS的权值对所述多组 RS对应的测量结果进行加权线性平均，其中 ，所述权值 为所述网络设备根据所述多组 RS的不同参数为所述多组 RS设置的，所述参数 包括发送功率、 RS的功率偏差、 以及 RS的发送周期中的一种或多种；或者 所述用户设备还包括：存储模块，用于存储所述多组 RS的不同参数，其 中 ，所述参数包括发送功率、 RS的功率偏差、 以及 RS的发送周期中的一种或 多种；所述获取模块具体用于，从所述存储模块获取多组 RS的不同参数，根 据所述多组 RS的不同参数为各组 RS设置的所述不同权值，对所述多组 RS对应 的测量结果进行加权线性平均。
28、 如权利要求 25至 27中任一项所述的用户设备，其特征在于， 所述接收模块具体用于，接收所述网络设备周期性地向 UE发送的所述多 组 RS；
所述发送模块具体用于，将所述联合的下行 CSI周期性地上报给所述网络 设备；
所述获取模块具体用于，根据一个上报周期内所述接收模块接收到的所 述多组 RS的测量结果获取所述上报周期内获得的多组 RS的联合的下行 CSI； 或者根据所述上报周期内所述接收模块接收到的接收到的所述多组 RS以及 所述上报周期之前接收到的所述多组 RS的测量结果获取所述多组 RS的联合 的下行 CSI；或者根据多组 RS中所述上报周期的最近一次所述接收模块接收 到的接收到的各组 RS的测量结果获取所述多组 RS的联合的下行 CSI。
29、 如权利要求 25至 28中任一项所述的用户设备，其特征在于， 所述接收模块具体用于，接收所述网络设备周期性地向 UE发送的所述多 组 RS；
所述发送模块具体用于，将所述联合的下行 CSI周期性地上报给所述网络 设备；
所述获取模块具体用于，对一个上报周期内在一次接收到的一组 RS进行 测量，并对本次得到的所述一组 RS的测量结果与最近一次得到的所述多组 RS 的滤波结果进行滤波，获取所述多组 RS的联合的下行 CSI。
30、 如权利要求 29所述的用户设备，其特征在于，
所述获取模块具体用于，根据不同组 RS对应的不同的滤波因子，对本次 得到的所述一组 RS的测量结果与最近一次得到的所述多组 RS的滤波结果进 行滤波，其中 ，
所述不同组 RS对应的滤波因子是通过所述接收模块从所述网络设备接 收的，其中 ，所述滤波因子是所述网络设备根据所述多组 RS的不同参数为不 同组 RS设置的，或者，
所述用户设备还包括存储模块，用于存储所述多组 RS的不同参数；所述 不同组 RS对应的滤波因子是所述获取模块根据所述存储模块存储的所述多 组 RS的不同参数为各组 RS设置的，
其中 ，所述参数包括发送功率， RS的功率偏差，以及 RS的发送周期。
31、 如权利要求 25至 30中任一项所述的用户设备，其特征在于， 所述接收模块，还用于接收所述网络设备在发送所述多组 RS时使用的功 率信息，并将所述功率信息传输给所述获取模块；
所述获取模块具体用于，根据所述功率信息以及所述多组 RS的所述测量 结果获取多组 RS的联合的下行 CSI。
32、 如权利要求 25至 31中任一项所述的用户设备，其特征在于， 所述接收模块，还用于接收所述网络设备向所述 UE发送的天线端口信 息，并将所述天线端口信息传输给所述获取模块，其中 ，所述天线端口信息 为所述多组 RS中某一组 RS的需要测量的 RS的天线端口的信息；
所述获取模块具体用于，对于所述某一组 RS ,根据所述天线端口信息测 量所述一组 RS对应的相应的天线端口所发送的 RS；
其中 ，所述天线端口信息包括天线端口数目信息、 天线端口编号信息、 和各天线端口是否被用于测量的信息中的一种或多种。
33、 如权利要求 25至 32中任一项所述的用户设备，其特征在于， 所述接收模块，还用于接收所述网络设备在发送所述多组 RS之前向 UE 发送多组 RS的信息；其中 ，所述多组 RS的信息包括 RS的发送周期、 RS序列 信息、 每组 RS包括的天线端口数目中的一种或多种；
所述接收模块具体用于，根据所述多组 RS的信息接收所述多组 RS。
34、 如权利要求 25至 33中任一项所述的用户设备，其特征在于， 所述接收模块还用于，接收所述网络设备向所述 UE发送的联合获取信 息，并将所述联合获取信息传输给所述获取模块；
所述获取模块还用于，根据所述联合获取信息，判断是否需要将一组 RS 的测量结果加入到获取所述联合的下行 CSI中 ，或者判断是否需要根据所有组 RS的测量结果获取所述联合的下行 CSI。
35、 如权利要求 25至 33中任一项所述的用户设备，其特征在于， 所述接收模块具体用于，接收属于第一集合的所述多组 RS；其中 ，所述 第一子集属于一个集合； 所述接收模块还用于，接收所述网络设备发送的所述第二子集的一组或 多组 RS ,并将所述第二子集的一组或多组 RS传输给所述获取模块；
所述获取模块还用于，测量所述接收模块接收的所述第二子集的一组或 多组 RS得到所述第二子集的各组 RS的测量结果，并根据所述第二子集的各组 RS的测量结果获取所述第二子集的下行 CSI ,并将所述第二子集的下行 CSI传 输给所述发送模块；其中 ，如果所述第二子集包含多组 RS ,所述第二子集的 下行 CSI为所述第二子集的多组 RS的联合的下行 CSI；
所述发送模块还用于， 向所述网络设备发送所述获取模块传输的所述所 述第二子集的下行 CSI。
36、 如权利要求 35所述的用户设备，其特征在于，
所述接收模块，还用于接收所述网络设备向 UE发送的子集信息，或者， 接收所述网络设备向所述 UE发送的联合获取信息，并将所述子集信息或者所 述联合获取信息传输给所述获取模块；
所述获取模块，还用于根据所述接收模块传输的所述子集信息，或者， 根据所述联合获取信息，确定任一组 RS归属的子集，其中 ，所述子集信息包 括所述第一子集和所述第二子集所包含的各组 RS的信息；所述联合获取信息 包括所述任一组 RS归属的子集的信息。
37、 如权利要求 35或 36所述的用户设备，其特征在于，
所述接收模块，还用于接收所述网络设备向所述 UE发送的天线端口信 息，其中 ，所述天线端口信息包括天线端口子集信息；
所述获取模块具体用于，根据所述天线端口信息测量一组 RS的相应的天 线端口所发送的 RS ,并确定所述天线端口所发送的 RS所归属的子集。
38、 一种网络设备，其特征在于，所述网络设备包括：
发送模块，用于向用户设备 UE发送多组参考信号 RS；以及
接收模块，用于接收所述 UE向所述网络设备上报的联合的下行信道状态 信息 CSI ,其中 ，所述联合的下行 CSI为所述 UE对所述多组 RS测量后根据所述 多组 RS的测量结果获取的所述多组 RS的联合的下行 CSI。
39、 如权利要求 38所述的网络设备，其特征在于，
所述发送模块，还用于在向 UE发送多组参考信号 RS之前向所述 UE发送 多组 RS的信息，以使 UE根据所述多组 RS的信息来接收所述多组 RS ,其中所 述多组 RS的信息包括 RS的发送周期、 RS序列信息、 以及每组 RS包括的天线 端口的数目中的一种或多种。
40、 如权利要求 38或 39所述的网络设备，其特征在于，
所述发送模块，还用于向所述 UE发送所述网络设备在发送所述多组 RS 时使用的功率信息，以使所述 UE根据所述功率信息以及所述多组 RS对应的测 量结果获取所述联合的下行 CSI。
41、 如权利要求 38至 40中任一项所述的网络设备，其特征在于，所述发 送模块，还用于向所述 UE发送天线端口信息，其中 ，所述天线端口信息为所 述多组 RS中一组 RS的需要测量 RS的天线端口信息，以使所述 UE根据所述天 线端口信息测量相应的天线端口所发送的所述 RS。
42、 如权利要求 38至 41中任一项所述的网络设备，其特征在于， 所述发送模块，还用于向所述 UE发送任一组 RS对应的联合获取信息，其 中 ，所述联合获取信息用于指示：是否将所述任一组 RS的测量结果加入到获 取所述联合的下行 CSI中 ，或者是否根据所有组 RS的测量结果获取所有组 RS 的联合的下行 CSI。
43、 如权利要求 38至 41中任一项所述的网络设备，其特征在于， 所述发送模块具体用于，发送属于第一子集的所述多组 RS ,其中 ，所述 第一子集属于一个集合；
所述发送模块还用于，向所述 UE发送第二子集对应的一组或多组 RS，所 述第二子集也属于所述集合；
所述接收模块还用于，接收所述 UE向所述网络设备上报的所述第二子集 的下行 CSI ,其中 ，如果所述第二子集包含多组 RS ,所述第二子集的下行 CSI 为所述第二子集对应的多组 RS的联合的下行 CSI。
44、 如权利要求 42所述的网络设备，其特征在于，
所述发送模块，还用于向所述 UE发送子集信息或联合获取信息，以使所 述 UE根据所述子集信息或所述联合获取信息确定任一组 RS归属的子集，其 中 ，所述子集信息包括所述第一子集和所述第二子集所包含的各组 RS的信 息；所述联合获取信息包括所述任一组 RS归属的子集的信息。
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