CN110138469B - Mobile terminal and method for measuring channel state information measurement reference signal thereof - Google Patents
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Abstract
The application discloses a method for measuring a channel state information measurement reference signal (CSI RS), which comprises the following steps: the UE acquires the position of a physical resource block occupied by the CSI RS; the UE estimates channel state information by using the CSI RS received at the position of the physical resource block, and calculates CQI and/or precoding matrix indication PMI; the CSI RS is the CSI RS subjected to precoding. The application also discloses a mobile terminal. By applying the method and the device, the system performance can be improved.
Description
The application is a divisional application of an invention patent application with the application number of 201210548556.5 entitled "a mobile terminal and a method for measuring a reference signal for measuring channel state information of the mobile terminal".
Technical Field
The present invention relates to wireless communication technologies, and in particular, to a mobile terminal in a wireless communication system and a method for measuring a channel state information measurement reference signal (CSI RS) thereof.
Background
In an advanced long term evolution system (LTE-a), in order to improve cell throughput and reduce interference between users, each cell may be configured with 16, 32, 64 or more transmit antennas for beamforming. The base station configures a channel state information measurement reference signal (CSI RS) for each User Equipment (UE) to measure CSI of a channel and then performs feedback. The design of the CSI RS before 3GPP release 12 is designed according to the actual number of antennas, and since the CSI RS before 3GPP release 12 has 8 ports at most, 8 resource elements are occupied in each physical resource block at most, as shown in fig. 1.
In the LTE-a system, the resource of the CSI RS is used by the UE to measure channel state information, which includes Channel Quality Indication (CQI), Precoding Matrix Indication (PMI), and the like. Currently, a CSI RS is sent to a UE by a base station, and a corresponding CSI RS original signal is directly transmitted in the whole downlink system bandwidth, as shown in fig. 2. The UE obtains CQI and PMI through measurement of CSI RS. Specifically, the CQI measurement method estimates channel information through CSI RS measurement, and then assumes that a specific PMI is used at the signal transmitting end to measure a corresponding CQI, that is, the CQI measurement is performed based on one PMI.
In LTE-a systems, SRS is divided into periodic SRS and aperiodic SRS signals, with periodic SRS transmissions comprising frequency hopped SRS signals and non-frequency hopped SRS signals. For each UE, configuring SRS Bandwidth B by high layer SignalingSRS，BSRSIs the bandwidth of each SRS transmission by the UE. For each UE, if the UE supports SRS frequency hopping, the SRS frequency hopping bandwidth b configured by high-layer signalinghopThe bandwidth of the SRS signal to which the UE may hop when hopping the SRS is determined, as shown in fig. 3.
As mentioned above, the CSI RS is currently transmitted directly within the entire system bandwidth; however, when the number of antennas of the system sharply increases, the amount of the CSI RS original signal also sharply increases, and if the CSI RS original signal is still directly transmitted in the entire system bandwidth, a large amount of system resources are required to be occupied, which may affect the transmission of data information in the system.
Disclosure of Invention
In view of the above, a main objective of the present application is to provide a method for measuring a channel state information measurement reference signal (CSI RS), which can improve system performance.
A method for measuring a channel state information measurement reference signal (CSI RS) comprises the following steps:
the UE acquires the position of a physical resource block occupied by the CSI RS;
the UE calculates CQI and/or Precoding Matrix Indication (PMI) by utilizing the CSI RS received at the position of the physical resource block; the CSI RS is the CSI RS subjected to precoding.
Preferably, the bandwidth corresponding to the physical resource block position occupied by the CSI RS is predefined in the communication standard.
Preferably, the bandwidth corresponding to the physical resource block position occupied by the CSI RS is a subset of the downlink system bandwidth.
Preferably, the bandwidth corresponding to the position of the physical resource block occupied by the CSI RS is configured by the system;
the bandwidth corresponding to the physical resource block position occupied by the CSI RS configured by the system is as follows: a predefined subset of the downlink system bandwidth in the communication standard.
Preferably, when the bandwidth corresponding to the position of the physical resource block occupied by the CSI RS is the subset of the downlink bandwidth, the position of the physical resource block occupied by the CSI RS is the same in the subframe where the CSI RS exists.
Preferably, the manner of obtaining the bandwidth corresponding to the physical resource block position occupied by the CSI RS includes: and the UE receives the indication of the high-level signaling to acquire the position of the physical resource block.
Preferably, the position of the physical resource block occupied by the CSI RS is the same as the position of the frequency domain occupied by the physical resource block occupied by the SRS signal.
Preferably, when the SRS signal is not configured with SRS frequency hopping, the physical resource block position occupied by the CSI RS is a PRB pair or a combination of PRB pairs occupied by the SRS signal;
and when the SRS signal configures SRS frequency hopping, the position of the physical resource block occupied by the CSI RS is a set of all frequency domain positions of the SRS signal in an uplink.
Preferably, the CSI RSs in the same PRB set use the same precoding matrix.
Preferably, the number of PRBs included in one PRB set adopting the same precoding matrix is determined according to the bandwidth occupied by the CSI RS; alternatively, the first and second electrodes may be,
and determining the number of PRBs included in one PRB set adopting the same precoding matrix according to the downlink system bandwidth.
Preferably, the number of PRBs included in one PRB set adopting the same precoding matrix is determined according to a semi-static configuration of the system or according to a fixed setting of the system.
Preferably, the semi-static configuration is used for configuring the number of PRBs; alternatively, the first and second electrodes may be,
the semi-static configuration is used for configuring a mode for determining the number of the PRBs, and the mode for determining the number of the PRBs is that the number of the PRBs is determined according to the bandwidth occupied by the CSI RS, or the number of the PRBs is determined according to the bandwidth of a downlink system.
A mobile terminal comprises a CSI RS position determining unit and a channel state determining unit;
the CSI RS position determining unit is used for acquiring the position of a physical resource block occupied by the CSI RS;
the channel state determining unit is used for estimating channel state information by using the CSI RS received at the position of the physical resource block and calculating CQI and/or PMI; the CSI RS is the CSI RS subjected to precoding.
By adopting the scheme, the UE acquires the position of the physical resource block occupied by the CSI RS, and calculates the CQI and/or the PMI by utilizing the CSI RS received at the corresponding position. And the CSI RS received by the UE is the CSI RS subjected to precoding by the base station. Through the processing of the application, the CSI RS is sent after being precoded, so that the system performance is improved through the precoding processing, ports of the CSI RS are reduced, and resources occupied by the CSI RS are saved. Furthermore, the CSI RS is transmitted on the same frequency band as the SRS, so that the channel characteristics acquired according to the SRS can be better matched, and the performance of CSI measurement is more accurate.
Drawings
Fig. 1 is a schematic diagram of a CSI RS physical resource structure within each PRB;
FIG. 2 is a diagram illustrating a CSI RS physical resource structure in a system bandwidth;
FIG. 3 is a diagram of SRS frequency hopping;
fig. 4 is a system flowchart of the CSI RS measurement method of the present application;
fig. 5 is a schematic diagram of occupied bandwidth of CSI RS according to an embodiment of the present application;
fig. 6 is a schematic diagram of occupied bandwidth of CSI RS according to an embodiment of the present application;
fig. 7 is a schematic diagram of occupied bandwidth of CSI RS according to an embodiment of the present application;
fig. 8 is a schematic diagram of occupied bandwidth of CSI RS according to an embodiment of the present application;
fig. 9 is a schematic diagram of occupied bandwidth of CSI RS according to an embodiment of the present application;
fig. 10 is a schematic structural diagram of a mobile terminal according to the present application.
Detailed Description
For the purpose of making the objects, technical means and advantages of the present application more apparent, the present application will be described in further detail with reference to the accompanying drawings.
As described in the foregoing background, with the rapid increase of the number of system antennas, if the original signal of the CSI RS is still directly transmitted in the full bandwidth range, a large amount of system resources are occupied by the CSI RS, which affects data transmission. Based on this, the application provides a CSI RS measurement method, where the UE does not directly receive the CSI RS original signal any more, but receives the CSI RS precoded by the base station by using the precoding matrix by using reciprocity of uplink and downlink channels of the TDD system. The base station performs channel estimation according to the SRS signal sent by the UE and determines a precoding matrix according to the SRS signal, and then sends the CSI RS to the UE after precoding by using the precoding matrix according to the reciprocity of the uplink and downlink channels of the TDD system. Therefore, the data volume of the CSI RS signal can be greatly reduced by carrying out precoding processing on the CSI RS, and system resources are saved. Meanwhile, for the condition that the number of system antennas is not too large, the signal quantity of the CSI RS is not changed, and the transmission performance of the CSI RS is improved through precoding processing of the CSI RS, so that the accuracy of channel estimation is improved, and the system performance is improved.
Here, since the CSI RS is transmitted to the UE after being precoded by the precoding matrix, the channel information estimated according to the CSI RS measurement is equivalent channel information, and the CQI when the precoding matrix is used can also be obtained by the equivalent channel information.
Specific implementations of the present application are described in detail below with specific examples. Fig. 4 is a flowchart of an embodiment of CSI RS measurement according to the present application. As shown in fig. 4, the method comprises the following steps:
step 401: the UE acquires the position of the frequency domain resource occupied by the CSI RS;
the CSI RS is a resource used for the UE to measure a channel state, and the UE needs to know a position of the CSI RS in a frequency domain, that is, a position of Physical Resource Blocks (PRBs) of the CSI RS, in order to measure the CSI RS and obtain channel state information, thereby feeding back the channel state information. Herein, the CSI RS refers to a CSI RS after being subjected to precoding processing by a precoding matrix. The specific precoding matrix can be capable of improving the system performance, and the specific form can be designed according to the actual needs. For example, the number of columns of the precoding matrix may be smaller than the number of rows, which reduces the amount of CSI RS signals. In more detail, the UE acquires the frequency domain resource location occupied by the CSI RS, and the following methods are provided:
the method comprises the following steps:
the position of the frequency domain resource occupied by the CSI RS is predefined in the standard. For example, the bandwidth occupied by the CSI RS reference signal is the downlink system bandwidth indicated by the MIB or the higher layer signaling, so that the UE knows the bandwidth occupied by the CSI RS after obtaining the downlink system bandwidth indicated by the MIB information or the higher layer signaling. For example, when the downlink system bandwidth indicated by the MIB is 20M, the CSI RS are distributed over 110 Physical Resource Blocks (PRBs) having a system bandwidth of 20M, as shown in fig. 2.
The method 2 comprises the following steps:
the frequency domain position occupied by the CSI RS corresponds to a bandwidth which is a subset of the entire downlink system bandwidth. For example, when the downlink system bandwidth indicated by the MIB is 20M, the CSI RS is distributed over N (N <110) Physical Resource Blocks (PRBs), as shown in fig. 5.
When the bandwidth occupied by the CSI RS is a subset of the entire downlink system bandwidth, the PRB positions occupied by the CSI RS reference signals are the same in all subframes where the CSI RS exists, as shown in fig. 6, which may facilitate the UE to measure the channel state information in different subframes. Since the CSI RS on any PRB pair or combination of PRB pairs within the bandwidth where the CSI RS reference signal is present can be measured on all subframes where the CSI RS is present.
When the bandwidth occupied by the CSI RS is a subset of the system bandwidth, there are several ways for the UE to obtain the bandwidth position occupied by the specific CSI RS, which are described below respectively.
Mode 1:
and the UE acquires the bandwidth occupied by the CSI RS reference signal by receiving the high-level signaling indication. The UE knows which PRBs have the CSI RS reference signals through the indication of the information of the high-layer instruction, so that the UE can perform CSI measurement on the PRB pairs or the PRB pair pairs with the CSI RS. For example, the system configures the starting PRB of the CSI RS reference signal and the number of PRBs occupied by the CSI RS through the high-level signaling, and the UE knows the PRB pair or PRB pair combination occupied by the CSI RS reference signal after receiving the high-level signaling, thereby measuring the channel state information on the corresponding bandwidth, as shown in fig. 7. When the method is adopted, the bandwidth occupied by the CSI RS can be freely configured and is not limited.
Mode 2:
the CSI RS reference signal occupies the same bandwidth as the SRS reference signal of the UE may skip.
Specifically, when the SRS reference signal is not configured SRS frequency hopping, the bandwidth B is in the uplink frequency bandSRSThe SRS is transmitted upwards, and the CSI RS reference signal is transmitted in the bandwidth corresponding to the downlink frequency band, that is, the PRB pair or the combination of the PRB pairs occupied by transmitting the CSI RS reference signal in the downlink is the same as the PRB pair or the combination of the PRB pairs occupied by transmitting the SRS reference signal in the uplink, as shown in fig. 8.
When the SRS reference signal configures the SRS to frequency hopping, on each subframe for transmitting the SRS reference signal, the UE transmits the SRS reference signal on the PRB of the frequency hopping bandwidth of the SRS, and on each subframe for transmitting the CSI RS reference signal, the UE transmits the SRS reference signal on all possible skipped SRS reference signalsTransmitting the CSI RS reference signal over a bandwidth. For example, the bandwidth of each transmission of SRS is BSRSThe frequency-domain position of the CSI RS at each downlink transmission is the set of all frequency-domain positions of the SRS at the uplink, as shown in fig. 9.
Because the precoding matrix for precoding the CSI RS is determined according to the result of uplink channel estimation performed by the SRS signal, when the bandwidth occupied by the CSI RS is the same as the frequency band occupied by the SRS, the channel experienced by the CSI RS is the same as the channel characteristic of the obtained corresponding precoding matrix, and then, the channel state information estimated by the CSI RS is more accurate.
The above is a manner that when the bandwidth occupied by the CSI RS is the subset of the downlink system bandwidth, the UE acquires the specific occupied bandwidth of the CSI RS.
The method 3 comprises the following steps:
the bandwidth occupied by the CSI RS reference signal may also be configurable, i.e. the case where the CSI RS reference signal occupies the bandwidth is configured through higher layer signaling. The bandwidth occupied by the configurable CSI RS may be either the two aforementioned methods, i.e. predefined by the communication standard or a subset of the downlink system bandwidth. The determination mode of the bandwidth occupied by the CSI RS reference signal can be indicated through different configuration values of the system.
For example, when the default configuration or the "bandwidth configuration occupied by the CSI RS reference signal" is considered to be a certain specific value, it indicates that the bandwidth occupied by the CSI RS reference signal is predefined in the communication standard (e.g., downlink system bandwidth); when the value of the bandwidth configuration occupied by the CSI RS reference signal is another specific value, it indicates that the bandwidth occupied by the CSI RS reference signal is a subset of the downlink system bandwidth.
Step 402: the UE estimates channel state information using the CSI RS reference signal and calculates CQI and/or PMI.
In this step, the CSI RS signal used by the UE for channel state information estimation is a signal subjected to precoding processing, and thus, as described above, the estimated channel state information is equivalent channel state information. Particularly, when performing channel state estimation, individual channel estimation can be performed according to the CSI RS signal on each PRB, similarly to the existing manner.
Or, to further improve the performance of channel estimation, the base station may use the same precoding matrix on multiple PRBs when performing CSI RS precoding. In this way, when performing channel estimation in this step, the UE may perform joint channel estimation by jointly using CSI RS on multiple PRBs of the same precoding matrix, thereby improving the performance of channel estimation.
Specifically, PRBs employing the same precoding matrix may be taken as one PRB set. When estimating the CSI RS channel state information and calculating CQI and/or PMI, the UE considers that precoding matrices adopted by CSI RS on a PRB set are the same. In order to correctly perform joint channel estimation of multiple CSI RSs, the UE needs to determine which PRBs belong to the same PRB set. The specific modes can be as follows:
1. the number of PRBs included in one PRB set is related to the bandwidth of CSI RS transmission, and the UE determines the number of PRBs included in one PRB set according to the bandwidth occupied by the current CSI RS. For example, a corresponding relationship is established between the number of PRBs included in a PRB set and the bandwidth for CSI RS transmission, as shown in table 1, the bandwidth of the CSI RS refers to the number of PRBs for transmitting CSI RS reference symbols, and the PRG size refers to the number of PRBs that the UE considers to adopt the same precoding matrix in the PRG size, that is, the number of PRBs included in one PRB set. Of course, table 1 is only an example, and other corresponding relationships may be established. Preferably, the larger the bandwidth of CSI RS transmission, the larger the number of PRBs included in one PRB set.
TABLE 1
2. The number of PRBs included in one PRB set is related to the downlink system bandwidth, and the UE determines the number of PRBs included in one PRB set according to the downlink system bandwidth. For example, similar to the first approach, a corresponding relationship may be established between the number of PRBs included in the PRB set and the downlink system bandwidth, and as shown in table 2, the PRG size refers to that the UE considers that PRBs within the PRG size use the same precoding matrix. The size of the downlink system may be obtained by the UE through receiving a Master Information Block (MIB) or a higher layer signaling, which is the same as the conventional method and is not described herein again.
TABLE 2
3. Semi-static configuration.
The number of PRBs occupied by one PRB set of the CSI RS adopting the same precoding matrix can be directly set in a semi-static manner, and the UE determines the number of PRBs occupied by one PRB set according to the semi-static configuration of the system.
Alternatively, a specific determination manner of the number of PRBs included in one PRB set may be set in a semi-static manner, for example, the semi-static setting determines the corresponding number of PRBs according to the downlink system bandwidth, or the semi-static setting determines the corresponding number of PRBs according to the bandwidth occupied by the CSI RS, that is, the manner of determining the number of PRBs in the foregoing 1 or 2 may be set in the semi-static manner. And the UE determines the number of PRBs included in one PRB set in a 1 or 2 mode according to the semi-static setting.
Because of the semi-static configuration, the corresponding number of PRBs or the manner of determining the number of PRBs may also be updated as needed. For example, the number of PRBs occupied by the PRB subset of the CSI RS with the same precoding matrix is configured by the higher layer signaling, and the UE obtains the number of PRBs occupied by one PRB set of the CSI RS with the same precoding matrix by reading the higher layer signaling.
4. The number of PRBs occupied by the set of PRBs of CSI RS using the same precoding matrix may also be set by the system, that is, the number of PRBs occupied by the subset of PRBs of CSI RS using the same precoding matrix is fixed no matter what the bandwidth of the CSI RS reference symbol is transmitted and the system bandwidth, for example, the number of PRBs occupied by the subset of PRBs of CSI RS using the same precoding matrix is 4.
After determining the number N of PRBs included in one PRB set, the PRB blocks included in each set may be set as needed, which belongs to a common technical means of those skilled in the art. For example, consecutive N PRBs may be set to belong to the same PRB set. As long as the base station and the UE are uniformly and correspondingly configured, the detailed description is omitted here.
The CSI RSs adopting the same precoding matrix are determined according to the mode, so that the CSI RSs can be combined to carry out channel estimation, and CQI and/or PMI can be calculated. All CSI RS or part of CSI RS in the same PRB set may be combined to perform channel estimation, which may be specifically set according to needs.
So far, the flow of the CSI RS measuring method in the embodiment of the present application is ended.
The application also provides a mobile terminal which can be used for implementing the CSI RS measuring method in the application. Fig. 10 is a schematic structural diagram of a mobile terminal according to the present application. As shown in fig. 10, the mobile terminal includes a CSI RS position determination unit and a channel state determination unit.
The CSI RS position determining unit is used for acquiring the position of a physical resource block occupied by the CSI RS; a channel state determining unit, configured to estimate channel state information using the CSI RS received at the corresponding physical resource block location, and calculate a CQI and/or a PMI; and the CSI RS is the CSI RS subjected to precoding by the precoding matrix indicated by the PMI.
In summary, according to the technical scheme of the present application, after the CSI RS is precoded, the system performance can be improved, and resources occupied by the CSI RS can be greatly saved when needed, so that more downlink physical resources are used for transmission of a physical downlink channel (PDSCH), thereby improving the throughput of downlink services. Meanwhile, the bandwidth occupied by the CSI RS is the same as the frequency band occupied by the SRS, so that the problem of PMI matching between CQI measured by the CSI RS and PMI obtained by the SRS is solved, and the accuracy of CSI RS channel estimation is improved; in addition, joint channel estimation is carried out on a plurality of CSI RSs adopting the same precoding through the UE, and the accuracy of CSI RS channel estimation is improved.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention. The foregoing is only a partial embodiment of the present application, and it should be noted that, for those skilled in the art, several modifications and decorations can be made without departing from the principle of the present application, and these modifications and decorations should also be regarded as the protection scope of the present application.
Claims (12)
1. A method performed by a UE for communicating in a communication system, the method comprising:
user Equipment (UE) acquires Channel State Information Reference Signal (CSIRS) configuration from a base station through high-level signaling, wherein the CSIRS configuration comprises the initial position and the number of Physical Resource Blocks (PRBs) of CSI RS;
the UE receives CSI RS according to the starting position and the number of the PRBs;
and the UE acquires the channel state information according to the received CSIRS.
2. The method of claim 1, wherein the number of PRBs of the CSIRS is defined by the number of PRBs occupied by a PRB subset, and wherein the number of PRBs occupied by the PRB subset is 4.
3. The method of claim 1, wherein the bandwidth corresponding to the PRB locations occupied by the CSIRS is a subset of a downlink system bandwidth.
4. The method according to any of claims 1-3, wherein the CSI RS is related to a precoding matrix.
5. The method of claim 4, wherein the precoding matrix associated with the CSIRS is associated with SRS.
6. The method of claim 1, further comprising:
the UE acquires SRS configuration from the base station through high-level signaling, wherein the SRS configuration comprises frequency hopping information;
and transmitting the SRS based on the frequency hopping information.
7. A mobile terminal is characterized in that the mobile terminal comprises a CSIRS position determining unit and a channel state determining unit;
the CSIRS location determining unit is configured to obtain a CSIRS configuration from a base station through a high-level signaling, where the CSIRS configuration includes an initial location and a number of physical resource blocks PRB of CSI RS;
and the channel state determining unit is used for receiving the CSI RS according to the starting position and the number of the PRBs and acquiring the channel state information according to the received CSIRS.
8. The mobile terminal of claim 7, wherein the number of PRBs of the CSIRS is defined by the number of PRBs occupied by a PRB subset, and wherein the number of PRBs occupied by the PRB subset is 4.
9. The mobile terminal of claim 7, wherein the bandwidth corresponding to the PRB location occupied by the CSIRS is a subset of a downlink system bandwidth.
10. The mobile terminal according to any of claims 7-9, wherein the CSI RS is related to a precoding matrix.
11. The mobile terminal of claim 10, wherein the precoding matrix associated with the CSIRS is associated with SRS.
12. The mobile terminal of claim 7, further comprising:
a unit configured to acquire an SRS configuration from the base station through a high-level signaling, wherein the SRS configuration includes frequency hopping information;
and a unit for transmitting an SRS based on the frequency hopping information.
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