CN103873124A - Mobile terminal and measuring method of CSI RS (channel state information reference signal) thereof - Google Patents
Mobile terminal and measuring method of CSI RS (channel state information reference signal) thereof Download PDFInfo
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Abstract
The invention discloses a measuring method of a CSI RS (channel state information reference signal). The method comprises the following steps of enabling UE (user equipment) to obtain the occupied physical resource block position of the CSI RS; enabling the UE to receive the evaluated channel state information of the CSI RS on the physical resource block position, and calculating a CQI (channel quality indicator) and/or a PMI (pre-encoding matrix indicator), wherein the CSI RS adopts the pre-encoded CSI RS. The invention also discloses a mobile terminal. The mobile terminal and the method can improve the properties of the system.
Description
Technical field
The present invention relates to wireless communication technology, particularly the method for measurement of the mobile terminal in a kind of wireless communication system and channel condition information measuring reference signals thereof (CSI RS).
Background technology
In advanced long-term evolution system (LTE-A), in order to improve cell throughout, reduce the interference between user, each community can configure 16,32,64 or more transmit antennas and be used for doing wave beam forming.Base station is that each subscriber equipment (UE) configurating channel state information measuring reference signals (CSI RS), for measuring the CSI of channel, is then fed back.The design of CSI RS before 3GPP version 12 is to design according to the actual number of antenna, because the CSI RS before 3GPP version 12 has at most 8 ports, takies at most 8 Resource Units, as shown in Figure 1 in each Physical Resource Block.
In LTE-A system, the resource of CSI RS is that UE is used for measure channel state information, and channel condition information comprises that channel quality instruction (CQI) and pre-coding matrix indicate (PMI) etc.At present, CSI RS sends to UE by base station, and directly transmits corresponding CSI RS primary signal in whole downlink system bandwidth, as shown in Figure 2.UE is by obtaining CQI and PMI to the measurement of CSI RS.Particularly, the method for measurement of CQI is, first estimates channel information by CSIR's S measurement, then supposes to use specific PMI at signal transmitting terminal, and to measure corresponding CQI, i.e. the measurement of CQI is carried out based on a PMI.
In LTE-A system, SRS is divided into SRS and the aperiodic SRS signal in cycle, and the SRS transmission in cycle comprises the SRS signal of frequency hopping and the SRS signal of non-frequency hopping.For each UE, configure SRS bandwidth B by high-level signaling
sRS, B
sRSit is the bandwidth that this UE sends SRS at every turn.For each UE, if this UE supports SRS frequency hopping, the SRS frequency hopping bandwidth b configuring by high-level signaling
hop, the bandwidth of the SRS signal that while determining SRS frequency hopping, UE may frequency hopping arrives, as shown in Figure 3.
As previously mentioned, CSI RS directly transmission in whole system bandwidth at present; But, in the time that the number of antennas of system sharply increases, the primary signal amount of CSI RS also will sharply increase, if still directly transmit CSI RS primary signal in whole system bandwidth, a large amount of system resource need to be taken, the transmission of data message in system can be had influence on.
Summary of the invention
In view of this, the application's main purpose is to provide the method for measurement of a kind of channel condition information measuring reference signals (CSI RS), can improve systematic function.
A method of measurement of channel condition information measuring reference signals CSI RS, comprising:
UE obtains the shared Physical Resource Block position of CSI RS;
UE utilizes the CSI RS receiving on described Physical Resource Block position to calculate CQI and/or pre-coding matrix instruction PMI; Wherein, described CSI RS is the CSI RS after precoding.
Preferably, the shared corresponding bandwidth in Physical Resource Block position of described CSI RS is predefined in communication standard.
Preferably, the subset that the corresponding bandwidth in the shared Physical Resource Block of described CSI RS position is dl system bandwidth.
Preferably, bandwidth corresponding to the shared Physical Resource Block of described CSI RS position is system configuration;
The shared corresponding bandwidth in Physical Resource Block position of CSI RS of described system configuration is: the subset of predefined or dl system bandwidth in communication standard.
Preferably, in the time of subset that the corresponding bandwidth in the shared Physical Resource Block of described CSI RS position is described downlink bandwidth, existing in the subframe of described CSI RS, the shared Physical Resource Block position of described CSI RS is identical.
Preferably, the mode of obtaining bandwidth corresponding to the shared Physical Resource Block position of CSI RS described in comprises: described UE receives the instruction of high-level signaling and obtains described Physical Resource Block position.
Preferably, the frequency domain position at the Physical Resource Block position place shared with SRS signal, the shared Physical Resource Block of described CSI RS position is the same.
Preferably, in the time that described SRS signal does not configure SRS frequency hopping, the shared Physical Resource Block of described CSI RS position be the PRB that takies of described SRS signal to or PRB to combination;
In the time of described SRS signal configures SRS frequency hopping, the shared Physical Resource Block of described CSI RS position is the set of SRS signal at all frequency domain positions of up link.
Preferably, the pre-coding matrix that the CSI RS in same PRB set adopts is identical.
Preferably, the bandwidth taking according to described CSI RS determines that a PRB of the identical pre-coding matrix of employing gathers included PRB number; Or,
Determine and adopt a PRB of identical pre-coding matrix to gather included PRB number according to described dl system bandwidth.
Preferably, determine and adopt a PRB of identical pre-coding matrix to gather included PRB number according to the semi-static configuration of system or according to being fixedly installed of system.
Preferably, the described semi-static described PRB number of configuration that is configured for; Or,
The described semi-static mode that is configured for the definite described PRB number of configuration, this mode of determining described PRB number is that the bandwidth taking according to CSI RS is determined described PRB number, or determines described PRB number according to dl system bandwidth.
A kind of mobile terminal, comprises CSI RS position determination unit and channel status determining unit;
Described CSI RS position determination unit, for obtaining the shared Physical Resource Block position of CSI RS;
Described channel status determining unit, for utilizing the CSI RS receiving on described Physical Resource Block position to estimate channel condition information, and calculates CQI and/or PMI; Wherein, described CSI RS is the CSI RS after precoding.
The such scheme that adopts the application, UE obtains the shared Physical Resource Block position of CSI RS, and utilizes the CSI RS receiving on relevant position to calculate CQI and/or PMI.Wherein, the CSI RS that UE receives is the CSI RS of base station after precoding.By above-mentioned the application's processing, will carry out sending after precoding to CSI RS, thereby improve systematic function by the processing of precoding, reduce the port of CSI RS and save the shared resource of CSI RS.Further, CSI RS is transmitted on the frequency band identical with SRS, thereby can mate better the characteristic of channel of obtaining according to SRS, the performance that CSI is measured is more accurate.
Brief description of the drawings
Fig. 1 is CSI RS physical resource structural representation in each PRB;
Fig. 2 is CSI RS physical resource structural representation in system bandwidth;
Fig. 3 is SRS frequency hopping schematic diagram;
Fig. 4 is the system flow chart of the application's CSI RS method of measurement;
Fig. 5 is the CSI RS occupied bandwidth schematic diagram of the application one embodiment;
Fig. 6 is the CSI RS occupied bandwidth schematic diagram of the application one embodiment;
Fig. 7 is the CSI RS occupied bandwidth schematic diagram of the application one embodiment;
Fig. 8 is the CSI RS occupied bandwidth schematic diagram of the application one embodiment;
Fig. 9 is the CSI RS occupied bandwidth schematic diagram of the application one embodiment;
Figure 10 is the concrete structure schematic diagram of mobile terminal in the application.
Embodiment
In order to make the application's object, technological means and advantage clearer, below in conjunction with accompanying drawing, the application is described in further details.
Described in aforementioned background art, along with the sharply increase of system antenna number, if still directly transmit the primary signal of CSI RS within the scope of full bandwidth, can cause a large amount of system resource to be taken by CSI RS, affect transfer of data.Based on this, the application provides the method for measurement of a kind of CSI RS, and UE no longer directly receives CSI RS primary signal, but utilizes the reciprocity of TDD system up-downgoing channel, receives base station and utilizes pre-coding matrix to carry out the CSI RS after precoding.Wherein, the SRS signal that base station sends according to UE carries out channel estimating and determines accordingly after a pre-coding matrix, according to the reciprocity of TDD system up-downgoing channel, utilizes pre-coding matrix to carry out sending to UE after precoding CSI RS again.Like this, by CSI RS is carried out to precoding processing, can greatly reduce the data volume of CSI RS signal, thereby save system resource.Meanwhile, for the not many situation of system antenna number itself, also can not change the semaphore of CSI RS, but by the precoding processing to CSI RS, improve the transmission performance of CSI RS, thereby improve the accuracy of channel estimating, improve systematic function.
Here, because CSI RS sends to UE after pre-coding matrix carries out precoding, the channel information therefore estimating according to CSIR's S measurement is equivalent channels information, by this equivalent channels information, the CQI also can obtain using this pre-coding matrix time.
Below by specific embodiment, the application's specific implementation is described in detail.Fig. 4 is the flow chart that the S of the application CSIR measures embodiment.As shown in Figure 4, comprise the following steps:
Step 401:UE obtains the position of the shared frequency domain resource of CSI RS;
CSI RS is the resource using for UE measures channel status, UE wants CSI RS to measure and obtain channel condition information, thereby feeding back channel state information, UE need to know the position of CSI RS at frequency domain, namely the Physical Resource Block of CSI RS (PRBs) position.Wherein, the CSI RS here refers to the CSI RS after pre-coding matrix carries out precoding processing.Concrete pre-coding matrix can improve systematic function, and concrete form can design according to actual needs.For example reduce the pre-coding matrix of CSI RS semaphore, specifically the columns of this pre-coding matrix can be less than line number.In more detail, UE obtains the shared frequency domain resource of CSI RS position following several method:
Method 1:
The position of the shared frequency domain resource of CSI RS is predefined in standard.For example, the bandwidth that CSI RS reference signal takies is the dl system bandwidth of MIB or high-level signaling instruction, and like this, UE, having obtained after the dl system bandwidth of mib information or high-level signaling instruction, has also just known the bandwidth that CSI RS takies.For example, in the time that the dl system bandwidth of MIB instruction is 20M, CSI RS is distributed on 110 Physical Resource Block (PRB) that system bandwidth is 20M, as shown in Figure 2.
Method 2:
The subset that bandwidth corresponding to frequency domain position that CSI RS takies is whole dl system bandwidth.For example, in the time that the dl system bandwidth of MIB instruction is 20M, CSI RS is distributed in N(N < 110) individual Physical Resource Block (PRB) is upper, as shown in Figure 5;
When the bandwidth taking at CSI RS is the subset of whole dl system bandwidth, in all subframes that have CSI RS, the PRB position that CSI RS reference signal takies is the same, as shown in Figure 6, can facilitate like this UE measure channel state information in different subframes.Because in all subframes that have CSI RS, all can measure exist in the bandwidth of CSI RS reference signal PRB arbitrarily to or the right combination of PRB on CSI RS.
When the bandwidth taking as CSI RS is the subset of system bandwidth, UE obtains the shared bandwidth location of concrete CSI RS following several mode, below explanation respectively.
Mode 1:
UE obtains the shared bandwidth of CSI RS reference signal by receiving high-level signaling instruction.UE, by the instruction of the information of high-level signaling, knows on which PRB, there is CSI RS reference signal, like this UE can the PRB that has a CSI RS to or PRB carry out CSI measurement on to combination.For example system configures the initial PRB of CSI RS reference signal and the PRB number that CSI RS takies by high-level signaling, UE receive just known after this high-level signaling the shared PRB of CSI RS reference signal to or PRB to combination, thereby the channel condition information in measurement respective bandwidth, as shown in Figure 7.While adopting in this way, the shared bandwidth of CSI RS can freely configure, unrestricted.
Mode 2:
The bandwidth that the shared bandwidth of CSI RS reference signal may be skipped with the SRS reference signal of UE is the same.
Particularly, when SRS reference signal is not when configuring SRS frequency hopping, in uplink band bandwidth B
sRSupper transmitting SRS, in the corresponding bandwidth of band downlink, transmit CSI RS reference signal, be on down link, transmit PRB that CSI RS reference signal takies to or PRB PRB that combination is taken with ul transmissions SRS reference signal to or PRB identical to combining, as shown in Figure 8;
In the time that SRS reference signal configuration SRS is frequency hopping, in each subframe of transmitting SRS reference signal, UE is transmitting SRS reference signal on the PRB of the frequency hopping bandwidth of SRS, in each subframe of transmission CSI RS reference signal, in the bandwidth that UE likely skips in SRS reference signal, transmit CSI RS reference signal.For example, the bandwidth of the each transmission of SRS is B
sRS, the PRB that same band that SRS frequency hopping takies at every turn may diverse location to or the right combination of PRB, CSI RS is exactly the set of SRS at all frequency domain positions of up link at the frequency domain position of downlink transmission at every turn, as shown in Figure 9.
Determined according to the uplink channel estimation result of being undertaken by SRS signal owing to CSI RS being carried out to the pre-coding matrix of precoding, therefore, in the time that the shared bandwidth of CSI RS is identical with SRS band occupancy, the channel that CSI RS experiences is identical with the characteristic of channel that obtains corresponding pre-coding matrix, then, by this CSI RS estimated go out channel condition information can be more accurate.
When the above-mentioned subset that to be in the shared bandwidth of CSI RS be dl system bandwidth, UE obtains the mode of the concrete occupied bandwidth of the S of CSIR.
Method 3:
The bandwidth that CSI RS reference signal takies can also be configurable, and the situation of CSI RS reference signal occupied bandwidth configures by high-level signaling.Can be aforementioned two kinds of methods for the shared bandwidth of CSI RS of configuration, by pre-defining in communication standard or being the subset of dl system bandwidth.Can be by definite mode of the different Configuration Values instruction CSI RS reference signal occupied bandwidths of system.
For example, can think when default configuration or " band width configuration that CSI RS reference signal takies " value are a certain particular value, represent that the bandwidth that CSI RS reference signal takies is predefined in communication standard (as dl system bandwidth); In the time that " band width configuration that CSI RS reference signal takies " value is another particular value, represent that the bandwidth that CSI RS reference signal takies is the subset of dl system bandwidth;
Step 402:UE utilizes CSI RS reference signal to estimate channel condition information, and calculates CQI and/or PMI.
In this step, UE is the signal through precoding processing for the CSI RS signal that carries out channel condition information estimation, and therefore as previously mentioned, the channel condition information that its estimation obtains is equivalent channels state information.Specifically carry out channel status estimate time, can with existing mode similarly, carry out individual channel estimation according to the CSI RS signal on each PRB.
Or for further improving the performance of channel estimating, base station, in the time carrying out CSI RS precoding, can adopt identical pre-coding matrix on multiple PRB.Like this, when UE carries out channel estimating in this step, the CSI RS that can combine on the multiple PRB that adopt identical pre-coding matrix carries out joint channel estimation, thereby improves the performance of channel estimating.
Particularly, the PRB that adopts identical pre-coding matrix can be gathered as a PRB.UE, in the time estimating CSI RS channel condition information and calculate CQI and/or PMI, thinks that the pre-coding matrix that CSI RS in PRB set adopts is the same.For correctly carrying out the joint channel estimation of multiple CSI RS, which PRB UE need to determine belongs to same PRB set.Concrete mode can have several as follows:
1, to gather included PRB number relevant to the bandwidth of CSI RS transmission for PRB, and UE determines that according to the shared bandwidth of current C SI RS a PRB gathers included PRB number.For example, gather the bandwidth of the PRB number that comprises and CSI RS transmission for PRB and set up corresponding relation, as shown in table 1, the bandwidth of CSI RS refers to the PRB number of transmission CSI RS reference symbol, think that the PRB in PRG size adopts identical pre-coding matrix and PRG size refers to UE, namely a PRB gathers included PRB number.Certainly, table 1 is only an example, can also set up other corresponding relation.Preferably, the bandwidth of CSI RS transmission is larger, and it is more that PRB gathers included PRB number.
Table 1
2, to gather included PRB number relevant to dl system bandwidth for PRB, and UE determines that according to dl system bandwidth a PRB gathers included PRB number.For example, with first kind of way similarly, can set up corresponding relation for PRB gathers the PRB number and the dl system bandwidth that comprise, as shown in table 2, PRG size refers to UE and thinks that the PRB in PRG size adopts identical pre-coding matrix.Wherein, the size of downlink system can be obtained by receiving Master Information Block (MIB) or high-level signaling by UE, identical with existing mode, just repeats no more here.
Table 2
3, the mode of semi-static configuration.
Wherein directly the semi-static PRB that the CSI RS that adopts identical pre-coding matrix is set gathers shared PRB number, and UE determines that according to the semi-static configuration of system a PRB gathers shared PRB number.
Or, can also determine mode by semi-static arrange that a PRB gathers included PRB number concrete, for example semi-static setting according to dl system bandwidth determined corresponding PRB number, or, the semi-static bandwidth taking according to CSI RS that arranges is determined corresponding PRB number, that is to say, the mode that employing aforementioned 1 or 2 can be semi-staticly set is determined the mode of PRB number.UE is according to semi-static setting, and the mode of employing 1 or 2 determines that a PRB gathers the PRB number comprising.
Owing to being semi-static configuration, the mode of corresponding PRB number or definite PRB number can also be upgraded as required.For example, the PRB number that adopts the PRB subset of the CSI RS of identical pre-coding matrix to take is configured by high-level signaling, and UE obtains the CSI RS of an identical pre-coding matrix PRB by reading high-level signaling gathers shared PRB number.
4, adopting the PRB of the CSI RS of identical pre-coding matrix to gather the PRB number taking can also be that system is fixedly installed, bandwidth and the system bandwidth of no matter transmitting CSI RS reference symbol are how many, the PRB number that adopts the PRB subset of the CSI RS of identical pre-coding matrix to take is fixed, as the PRB number that adopts the PRB subset of the CSI RS of identical pre-coding matrix to take is 4.
Gather at a definite PRB PRB comprising and count after N, PRB piece included in each set can arrange as required, belongs to those skilled in the art's common technology means.For example, a continuous N PRB can be set and belong to same PRB set.As long as base station and UE unify relative set, just repeat no more here.
Determine in the manner described above the CSI RS that adopts identical pre-coding matrix, just can combine these CSI RS and carry out channel estimating, and calculate CQI and/or PMI.All CSI RS or the part CSI RS that can combine in same PRB set carry out channel estimating, specifically can arrange as required.
So far, the CSI RS method of measurement flow process in the embodiment of the present application finishes.
The application also provides a kind of mobile terminal, can be for implementing the CSI RS method of measurement in above-mentioned the application.Figure 10 is the concrete structure schematic diagram of mobile terminal in the application.As shown in figure 10, this mobile terminal comprises CSI RS position determination unit and channel status determining unit.
Wherein, CSI RS position determination unit, for obtaining the shared Physical Resource Block position of CSI RS; Channel status determining unit, for utilizing the CSI RS receiving in respective physical resource block location to estimate channel condition information, and calculates CQI and/or PMI; Wherein, CSI RS is the CSI RS after the indicated pre-coding matrix precoding of PMI.
In a word, adopt the application's technical scheme, CSI RS is after precoding processing, can improve systematic function, and can greatly save when needed the resource that CSI RS takies, make the transmission of more downlink physical resource for physical down link channel (PDSCH), thereby improve the throughput of downlink business.Meanwhile, identical by the frequency band that bandwidth that CSI RS takies is taken with SRS, thus solve CQI that CSI RS measures and obtained PMI matching problem by SRS, the accuracy of raising CSI RS channel estimating; In addition, by UE, the multiple CSI RS that adopt identical precoding are carried out to joint channel estimation, improve the accuracy to CSI RS channel estimating.
The foregoing is only preferred embodiment of the present invention, in order to limit the present invention, within the spirit and principles in the present invention not all, any amendment of making, be equal to replacement, improvement etc., within all should being included in the scope of protection of the invention.
Claims (13)
1. a method of measurement of channel condition information measuring reference signals CSI RS, is characterized in that the method comprises:
UE obtains the shared Physical Resource Block position of CSI RS;
UE utilizes the CSI RS receiving on described Physical Resource Block position to calculate CQI and/or pre-coding matrix instruction PMI; Wherein, described CSI RS is the CSI RS after precoding.
2. method according to claim 1, is characterized in that, the shared corresponding bandwidth in Physical Resource Block position of described CSI RS is predefined in communication standard.
3. method according to claim 1, is characterized in that, the subset that the corresponding bandwidth in the shared Physical Resource Block of described CSI RS position is dl system bandwidth.
4. method according to claim 1, is characterized in that, bandwidth corresponding to the shared Physical Resource Block of described CSI RS position is system configuration;
The shared corresponding bandwidth in Physical Resource Block position of CSI RS of described system configuration is: the subset of predefined or dl system bandwidth in communication standard.
5. according to the method described in claim 3 or 4, it is characterized in that, in the time of subset that the corresponding bandwidth in the shared Physical Resource Block of described CSI RS position is described downlink bandwidth, existing in the subframe of described CSI RS, the shared Physical Resource Block position of described CSI RS is identical.
6. method according to claim 1, is characterized in that, described in obtain bandwidth corresponding to the shared Physical Resource Block position of CSI RS mode comprise: described UE receives the instruction of high-level signaling and obtains described Physical Resource Block position.
7. method according to claim 1, is characterized in that, the frequency domain position at the Physical Resource Block position place shared with SRS signal, the shared Physical Resource Block of described CSI RS position is the same.
8. method according to claim 7, is characterized in that, in the time that described SRS signal does not configure SRS frequency hopping, the shared Physical Resource Block of described CSI RS position be the PRB that takies of described SRS signal to or PRB to combination;
In the time of described SRS signal configures SRS frequency hopping, the shared Physical Resource Block of described CSI RS position is the set of SRS signal at all frequency domain positions of up link.
9. according to the method described in claim 1,2,3,4,6,7 or 8, it is characterized in that, the pre-coding matrix that the CSI RS in same PRB set adopts is identical.
10. method according to claim 9, is characterized in that, the bandwidth taking according to described CSI RS determines that a PRB of the identical pre-coding matrix of employing gathers included PRB number; Or,
Determine and adopt a PRB of identical pre-coding matrix to gather included PRB number according to described dl system bandwidth.
11. methods according to claim 9, is characterized in that, determine and adopt a PRB of identical pre-coding matrix to gather included PRB number according to the semi-static configuration of system or according to being fixedly installed of system.
12. methods according to claim 11, is characterized in that, the described semi-static described PRB number of configuration that is configured for; Or,
The described semi-static mode that is configured for the definite described PRB number of configuration, this mode of determining described PRB number is that the bandwidth taking according to CSI RS is determined described PRB number, or determines described PRB number according to dl system bandwidth.
13. 1 kinds of mobile terminals, is characterized in that, this mobile terminal comprises CSI RS position determination unit and channel status determining unit;
Described CSI RS position determination unit, for obtaining the shared Physical Resource Block position of CSI RS;
Described channel status determining unit, for utilizing the CSI RS receiving on described Physical Resource Block position to estimate channel condition information, and calculates CQI and/or PMI; Wherein, described CSI RS is the CSI RS after precoding.
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| CN103873124B (en) | 2019-06-21 |
| CN110138469B (en) | 2022-04-15 |
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