CN103428749A - Method and device for measuring downlink multipoint signal quality - Google Patents
Method and device for measuring downlink multipoint signal quality Download PDFInfo
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- CN103428749A CN103428749A CN2012101550071A CN201210155007A CN103428749A CN 103428749 A CN103428749 A CN 103428749A CN 2012101550071 A CN2012101550071 A CN 2012101550071A CN 201210155007 A CN201210155007 A CN 201210155007A CN 103428749 A CN103428749 A CN 103428749A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/30—Monitoring; Testing of propagation channels
- H04B17/382—Monitoring; Testing of propagation channels for resource allocation, admission control or handover
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/30—Monitoring; Testing of propagation channels
- H04B17/309—Measuring or estimating channel quality parameters
- H04B17/336—Signal-to-interference ratio [SIR] or carrier-to-interference ratio [CIR]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/30—Monitoring; Testing of propagation channels
- H04B17/309—Measuring or estimating channel quality parameters
- H04B17/318—Received signal strength
- H04B17/327—Received signal code power [RSCP]
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- 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
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- 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
- H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
- H04L1/0076—Distributed coding, e.g. network coding, involving channel coding
- H04L1/0077—Cooperative coding
Abstract
The invention belongs to the technical field of wireless communication, and provides a method and device for measuring downlink multipoint signal quality. The method includes the steps that UE receives resource management set configuration information of CSI-RS sent by a base station through RRC signals; the UE demodulates the RRC signals to obtain the resource management set configuration information of the CSI-RS, and the UE measures RSRQ according to CSI-RS antenna port numbers, configuration of sub-frames in each CSI-RS resource and configuration of resources of CSI-RS indicated in the resource management set configuration information of the CSI-RS. According to the technical scheme, measuring accuracy of CSI-RS RSRQ of all downlink emitting points can be improved, complexity is low, and spectrum efficiency of a system is also indirectly improved.
Description
Technical field
The present invention relates to communication technical field, relate in particular to a kind of descending multi-point signal mass measuring method and device.
Background technology
The research and development of wireless communication system is now more and more carried out evolution to reaching the more direction of spectral efficient.In order to reach higher spectrum efficiency, one of them important directions is exactly the spectrum efficiency how improved under multiple sectors at same networking frequently condition.Down direction in multiple sectors at same networking frequently, the downlink point of each community all is being UE (User Equipment in own community, subscriber equipment) send downlink data, owing to being identical networking, so the downstream signal that neighbor cell sends on down direction can superpose mutually in the UE side, thereby the descending reception of UE is produced to interference.Solving a plurality of adjacent a kind of effective ways that at down direction, UE produced to interference with the exit point that takes place frequently is, a plurality of different downlink points are carried out to CoMP (Coordinated Multiple Points, collaborative multiple spot) operation, so that the signal that each different launch point arrives the UE side can produce useful stack, thereby produce corresponding receiving gain.Realize above-mentioned purpose, need to be measured the downstream signal of the emission of the adjacent base station from same frequency in the UE side, then UE reports the signal quality of measurement to the base station of service is provided oneself, so that serving BS is made the selecting properly of multipoint cooperative.Therefore how under the identical networking condition that has co-channel interference, it is correctly to carry out cooperation point to select basis that the signal quality from different base station is carried out to accurate and effective measurement, is also one of key factor improved the multi-cell downlink spectrum efficiency.
For how measuring frequently signal quality measured under the networking condition of multiple sectors at same, use LTE-A (Long Term Evolution-Advanced in prior art, senior Long Term Evolution) downlink channel condition information CSI-RS (the Channel State Information-Reference Signal of definition in version 10, channel state information reference signals) OFDM (Orthogonal Frequency Division Multiplexing, the OFDM) character position occurred in carries out the measurement of signal quality.
Use the OFDM character position occurred in the CSI-RS of definition in LTE-A version 10 to carry out the measurement of signal quality, the main problem existed is, the density that CSI-RS in LTE-A version 10 occurs is the closeest be also 5ms once, the rarelyst reach 80ms once, and a CSI-RS resource only takies 2 OFDM symbols.Therefore, if use the OFDM character position occurred in the CSI-RS as definition in version 10 to carry out the measurement of signal quality, its precision is difficult to meet the requirement of descending CoMP multidrop channel mass measurement.
Summary of the invention
The embodiment of the present invention provides a kind of method of measurement, device and subscriber equipment of downlink channel condition information, it is large to be intended to solve the cycle that CSI-RS occurs, more sparse and the inadequate problem of certainty of measurement that bring of signal, improve the certainty of measurement of CSI-RS RSRQ, can provide effective metrical information for the descending multi-point transmitting of descending CoMP signal quality measured.
On the one hand, provide a kind of descending multi-point signal mass measuring method, comprising:
User equipment (UE) receives the channel state information reference signals CSI-RS resource management collection configuration information that base station sends by the radio resource control RRC signaling, described CSI-RS resource management collection configuration information comprises: CSI-RS antenna end slogan, CSI-RS resource distribution, and the sub-frame configuration of each CSI-RS resource;
The described RRC signaling of UE demodulation, obtain CSI-RS resource management collection configuration information;
CSI-RS resource distribution according to described CSI-RS resource management collection configuration information indication, and the sub-frame configuration of each CSI-RS resource, measured the Reference Signal Received Power RSRP measured value of CSI-RS by antenna port corresponding to described CSI-RS antenna end slogan;
The measuring position of signaling Network Based indication, or the measuring position based on described UE higher layer message indication, or the method for measurement based on described UE higher layer message indication, carry out the received signal strength indicator rssi measurement of CSI-RS, obtains CSI-RS rssi measurement value;
According to formula RSRQ=N*RSRP/RSSI, calculate the measured value of CSI-RS RSRQ, wherein, N is the Resource Block RB quantity of measuring on the bandwidth of received signal strength indicator RSSI place, RSRP is CSI-RS RSRP measured value, and RSSI is CSI-RS rssi measurement value.
On the other hand, provide a kind of descending multi-point signal apparatus for measuring quality, for subscriber equipment, channel state information reference signals CSI-RS Reference Signal Received Quality RSRQ is measured, this device comprises:
Receiving element, the CSI-RS resource management collection configuration information sent by the radio resource control RRC signaling for receiving base station, described CSI-RS resource management collection configuration information comprises: CSI-RS antenna end slogan, CSI-RS resource distribution, and the sub-frame configuration of each CSI-RS resource;
Demodulating unit, the RRC signaling received for the described receiving element of demodulation, obtain CSI-RS resource management collection configuration information;
The first measuring unit, for the CSI-RS resource distribution according to described CSI-RS resource management collection configuration information indication, and the sub-frame configuration of each CSI-RS resource, measured the Reference Signal Received Power RSRP measured value of CSI-RS by antenna port corresponding to described CSI-RS antenna end slogan;
The second measuring unit, for the measuring position of signaling indication Network Based, or the measuring position based on described UE higher layer message indication, or the method for measurement based on described UE higher layer message indication, carry out the received signal strength indicator rssi measurement of CSI-RS, obtain CSI-RS rssi measurement value;
Computing unit, for according to formula RSRQ=N*RSRP/RSSI, calculate the measured value of CSI-RS RSRQ, wherein, N is the quantity of measuring the Resource Block RB of received signal strength indicator RSSI place bandwidth, and RSRP is CSI-RS RSRP measured value, and RSSI is CSI-RS rssi measurement value.
In embodiments of the present invention, the RRC signaling that includes CSI-RS resource management collection configuration information sent by receiving base station, and according to the subframe configuration information of the CSI-RS resource distribution in RRC signaling indication and CSI-RS resource, carry out the measurement of CSI-RS Reference Signal Received Quality RSRQ on specific position, with in prior art only the CSI-RS place the measurement of carrying out signal quality of OFDM character position compare, under the less situation of the density that method provided by the invention can occur at CSI-RS, can guarantee the certainty of measurement of CSI-RS RSRQ, thereby improve the certainty of measurement to the CSI-RS RSRQ of each downlink point, for base station provides the report of measures signal quality more accurately, contribute to base station to make more effective judgement when CoMP cooperation collection is selected, thereby can improve the accuracy that CoMP emission collection launch point is selected, more effectively guaranteed the acquisition of CoMP gain, thereby improved the spectrum efficiency of system.
The accompanying drawing explanation
The LTE CoMP general system model schematic diagram that Fig. 1 provides for the embodiment of the present invention;
A Resource Block schematic diagram in the subframe structure that Fig. 2 is use normal CP in the LTE system;
The descending multi-point signal mass measuring method flow chart that Fig. 3 provides for the embodiment of the present invention one;
The method of measurement flow chart of the CSI-RS Reference Signal Received Quality RSRQ that Fig. 4 provides for the embodiment of the present invention one;
CSI-RS port one 5 and 16 schematic diagrames of normal CP type subframe on a RB that Fig. 5 a provides for the embodiment of the present invention one;
CSI-RS single port 15 schematic diagrames of normal CP type subframe on a RB that Fig. 5 b provides for the embodiment of the present invention one;
Fig. 6 is the CRS rssi measurement method block diagram that the embodiment of the present invention one provides;
Fig. 7 is two kinds of OFDM character position schematic diagrames that in the normal subframe that provides of the embodiment of the present invention one, CSI-RS occurs;
The descending multi-point signal mass measuring method flow chart that Fig. 8 provides for another embodiment of the present invention;
Fig. 9 is the structured flowchart of the descending multi-point signal apparatus for measuring quality that provides of the embodiment of the present invention two.
Embodiment
In order to make purpose of the present invention, technical scheme and advantage clearer, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein, only in order to explain the present invention, is not intended to limit the present invention.
Below in conjunction with specific embodiment, realization of the present invention is described in detail:
Embodiment mono-
The embodiment of the present invention provides a kind of descending multi-point signal mass measuring method, the method is typically applied in the LTE communication system, in the LTE communication system, data send can be divided into up transmission and descending transmission, uply refer to that transmit leg is user terminal UE, the recipient is base station (the node B of eNB:evolved Node B evolution); Descending transmission refers to that transmit leg is base station, and the recipient is user terminal.Fig. 1 is the CoMP mode of operation schematic diagram of the LTE system that provides of the embodiment of the present invention, as shown in Figure 1, under the CoMP pattern, a plurality of base stations provide communication service for a plurality of users (being travelling carriage) collaboratively, each user can receive the data flow of a plurality of antennas, and, at synchronization, each user can independently receive different data flow, therefore can reach higher throughput (throughput).
Descending CoMP need to do the measurement of the signal quality of a plurality of downlink points, carrying out these, to measure needed physical resource be C SI-RS (Channel State Information-Reference Signal channel state information reference signals), the parameter of the signal quality of required measurement is RSRP (Reference Signal Received Power Reference Signal Received Power) and RSRQ (Reference Signal Received Quality Reference Signal Received Quality), writes a Chinese character in simplified form into CSI-RS RSRP and CSI-RS RSRQ.RSRP is the intensity level of the signal power received on specific reference letter, and RSRQ is the signal quality value defined on specific reference signals.
In LTE-A version 10, defined the method that CRS does channel quality measurement, the method is mainly to carry out on the port 0 for CRS, as shown in Figure 2, for a RB (Resource Block, the Resource Block) schematic diagram in the subframe structure that uses normal CP in the LTE system.The CSI-RS signal of sign Port0 appears on the parton carrier wave in the OFDM symbol 0 and 4 in time slot 0 and time slot 1.The CRS RSRP that is mobile management is that the CSI-RS signal on port 0 is as shown in Figure 1 measured, if UE can detect the CRS port one, can do the measurement of RSRP simultaneously on port 0 and port one, otherwise acquiescence is done the measurement of RSRP on port 0.Measure the value of CRS RSRQ, only need to measure the value of CRS RSSI, the value of CRS RSSI is to be defined on the OFDM symbol 0 of the time slot 0 shown in upper figure and time slot 1 and symbol 4 to carry out.
In addition, in LTE-A version 10, also defined the measurement that CSI-RS does channel quality, consider to make of the CSI-RS configuration mode of counterpart 10 measurement of more kinds of types simultaneously in the research of version 11, comprised the measurement of doing the signal quality (CSI-RS RSRP and CSI-RS RSRQ) of descending CoMP emission multiple spot by the CSI-RS resource of non-zero.The port one 5-22 that the CSI-RS reference signal occurs, the OFDM symbol 5,6 that the OFDM character position occurred in normal CP (general cyclic prefix) is time slot 0 and the OFDM symbol 2,3 (as Fig. 2) of time slot 1, and the OFDM symbol 4 and 5 of the expansion CP on time slot 0 and time slot 1.As mentioned above, the measurement that only the OFDM character position at CSI-RS place of definition carries out signal quality in version 10 is can not meet descending CoMP multi-point transmitting the measurement of signal quality is required.The present invention will solve when measuring CSI-RS RSRQ, and system is which OFDM symbol of indication measurement and the method measured how.
Particularly, according to Fig. 3, the descending multi-point signal mass measuring method that the embodiment of the present invention one provides comprises:
Step S301, user equipment (UE) receives the channel state information reference signals CSI-RS resource management collection configuration information that base station sends by the radio resource control RRC signaling;
Particularly, CSI-RS resource management collection configuration information is pre-configured by base station eNB, in one embodiment, eNB (is that eNB can pass through information of adjacent cells according to topology of networks, and OAM (Operation Administration Maintenance, operation management maintain) interface obtains the list that is connected of the adjacent sending node adjacent with this eNB, which community is arranged with own adjacent around knowing) come to configure CSI-RS resource management collection for the particular UE of eNB service, then eNB sends to UE by this CSI-RS resource management collection configuration information by the specific RRC of UE (Radio Resource) signaling.
Wherein, CSI-RS resource management collection configuration information comprises: CSI-RS antenna end slogan, CSI-RS resource distribution, the sub-frame configuration of each CSI-RS resource; Wherein, the CSI-RS resource distribution is a kind of indication information, is used to refer to the subframe position that CSI-RS occurs, the OFDM character position that CSI-RS occurs in subframe, and the sub-carrier positions occurred on each RB in frequency domain; The sub-frame configuration of CSI-RS resource means period of sub-frame and the subframe skew that the CSI-RS signal occurs;
In another embodiment, CSI-RS resource management collection configuration information also further comprises: carry out the initial cell identification information (being labeled as X) of the sequence scrambler initialization needs of CSI-RS reference signal generation, the CSI-RS number of resources.
Step S302, the described RRC signaling of UE demodulation, obtain CSI-RS resource management collection configuration information, and carry out the measurement of CSI-RS Reference Signal Received Quality RSRQ according to the CSI-RS antenna end slogan of indicating in described CSI-RS resource management collection configuration information, sub-frame configuration and the CSI-RS resource distribution of each CSI-RS resource.
As a preferred embodiment of the present invention, carry out CSI-RS Reference Signal Received Quality RSRQ measurement concrete grammar concrete implementation as shown in Figure 4:
Particularly, UE is according to the CSI-RS resource distribution of described CSI-RS resource management collection configuration information indication, and the sub-frame configuration of each CSI-RS resource, measured the Reference Signal Received Power RSRP measured value of CSI-RS by antenna port corresponding to described CSI-RS antenna end slogan.Particularly, frequency domain position on the subframe position that UE occurs according to the indicated CSI-RS of described CSI-RS resource distribution, CSI-RS place OFDM character position, CSI-RS place RB, signal power on all CSI-RS subcarriers that measured by the CSI-RS on the Measurement bandwidth of described antenna port, then the performance number all these measured is carried out arithmetic average, obtains the measured value of CSI-RS RSRP on corresponding CSI-RS resource; Below by for example, the method for measurement of CSI-RS RSRP is described further.
Fig. 5 a is depicted as CSI-RS port one 5 and 16 schematic diagrames of normal CP type subframe on a RB, and under the situation that is multiport to CSI-RS below with reference to Fig. 5 a, the method for measurement of CSI-RS RSRP is done an explanation; Suppose that a CSI-RS resource that UE receives distributes to be as shown in Figure 5 a and have the CSI-RS resource that 2 port numbers are 15 and 16, when the RSRP that is CSI-RS measures, UE can first do the despreading of orthogonal covering codes, suppose that the data that UE receives on 2 OFDM symbol subcarriers shown in Fig. 5 are respectively r1 and r2, the received signal power P on port one 5 and 16 at UE
15, P
16Be respectively:
UE carries out arithmetic average to the signal power measured on the port one 5 and 16 on all RB, obtains the RSRP measured value of CSI-RS RSRP on corresponding port 15 main 16.That the value of reporting measured on the CSI-RS resource shown in Fig. 5 is the RSRP measured value that finally obtains on port one 5 and 16 and.
The method of measurement that is below the CSI-RS RSRP under the single port situation to CSI-RS is done an explanation.Be single port 15 for the CSI-RS antenna port of normal CP type subframe on a RB as shown in Figure 5 b, now when calculating CSI-RS RSRP, only need to do the calculating of port one 5, that is:
Then, UE carries out arithmetic average to the signal power measured on all RB on the CSI-RS Measurement bandwidth of port 15, obtains the measured value of CSI-RS RSRP.This is also the value of reporting measured on the CSI-RS resource.From top explanation, can find out, no matter be single antenna port or a plurality of antenna port, CSI-RSRSRP only has the value of reporting.
Particularly, the embodiment of the present invention provides the method for measurement of three kinds of CSI-RS RSSI: the measuring position of signaling indication Network Based or the measuring position based on described UE higher layer message indication or the method for measurement of indicating according to described UE higher layer message are carried out the received signal strength indicator rssi measurement of CSI-RS, below these three kinds of methods are done to a detailed description.
Consider under descending CoMP scene, all downlink points are almost time, Frequency Synchronization, so the result of the CRS RSSI measured based on CRS in mobile management, can think to the greatest extent identical like the measurement result based on CSI-RS when being CoMP, therefore in one embodiment of the invention, the method for measurement of a kind of simple and effective CSI-RS RSSI is directly to use CRS rssi measurement unit result;
Figure 6 shows that and use CRS rssi measurement unit method block diagram as a result, according to Fig. 6, the method mainly comprises:
The RRC signaling that includes CSI-RS resource management collection configuration information that step 1:UE issues from the eNB received, and obtain the CSI-RS resource.
Step 2:UE, in the measuring unit of CSI-RS RSSI, directly reads the RSSI value that the physical layer with current time the last time measures based on CRS port 0, as the physical layer measured value of CSI-RS RSSI from UE side shifting administrative unit.
In another embodiment of the present invention, UE can be Network Based the measuring position of signaling indication, carry out the CSI-RS rssi measurement, obtain CSI-RS rssi measurement value;
Particularly, eNB, by special RRC signaling, gives the specific RRC signaling of UE configuration UE, in this RRC signaling, includes the position Indication message, is used to refer to the measurement of being CSI-RS RSRQ on which position in the subframe occurred at CSI-RS.The position of position Indication message indication is here divided again two kinds, a kind of refer to be shown on which OFDM symbol do measurement.The position of indication can be whole OFDM symbols of 2 time slots in certain subframe or a part of OFDM symbol wherein.For instance, as shown in Figure 7, if eNB by the RRC signal deployment character position the measured OFDM symbol 3,4,5,6 that is time slot 0 and whole OFDM symbols of time slot 1, UE does the measurement of RSSI on 10 OFDM symbols altogether at this, and then these 10 RSSI values are done sums on average, obtain final CSI-RS rssi measurement value.Here further illustrate the method for measurement of RSSI.The Measurement bandwidth of supposing RSSI is 50RB, in the LTE agreement, always has 12 subcarriers on each RB.Calculate the arithmetic average of sub-carrier power on each RB on each OFDM symbol, then the power on all 50 RB in Measurement bandwidth on this OFDM symbol is done to addition, obtain a RSSI value on the OFDM symbol.Perhaps when the CSI-RSSI measurement is appearring in continuous 5 descending sub frames after the CSI-RS resource location starts carrying out in the indication of RRC signaling, the position of UE all OFDM symbols on these subframes is measured, and then the result measured on all subframes is done sums on average.
Described calculation is stated on average, and hypothesis has M number a1, a2 ..., aM, mean value a=(a1+a2+...+aM)/M is stated in the calculation of this M number.
The indication of another kind of position is that eNB does the measurement of RSRQ by special RRC signaling indication on which descending sub frame.UE, according to the RRC signaling of eNB configuration, carries out the measurement of RSSI value to the OFDM symbol on all subframes of signaling indication, and then UE carries out arithmetic average to the RSSI measured on all subframes, obtains final CSI-RS rssi measurement value.
It should be noted that, do the measurement of CSI-RS RSRQ on which position in the subframe that eNB can indicate UE to occur at CSI-RS by special RRC signaling; ENB also can also be included in the position Indication message in the lump in this RRC signaling when sending CSI-RS resource management collection configuration information by the radio resource control RRC signaling, sends to corresponding UE.
In another embodiment, can also indicate to select different measuring positions to do the CSI-RS rssi measurement according to UE side higher layer message, obtain CSI-RS rssi measurement value;
It should be noted that, owing to measuring RSSI, do not need to indicate the position of frequency domain, so which subframe is the UE higher layer message only need to be indicated to or the measurement of which OFDM symbol gets final product.Therefore, the positional information of described UE higher layer message indication mainly comprises: the subframe numbers of CSI-RS RSSI antenna end slogan, measurement and/or the OFDM symbol in described subframe numbers;
Particularly, when not using above-mentioned two kinds of methods, the OFDM symbolic number that the high level of UE can self-defining be measured or need the subframe position of measuring, and the physical layer that the OFDM character position of needs being measured by interlayer message is issued UE is measured.In OFDM symbol 3,5,6 as the high level of UE indication UE in the time slot 0 of CSI-RS resource place subframe and the OFDM symbol 2,3,5,6 in time slot 1, measured.The UE physical layer is carried out the measurement of RSSI by above-mentioned indicated OFDM position, after measuring, then each RSSI value measured on above-mentioned OFDM symbol is carried out to arithmetic average.Perhaps when the CSI-RSSI measurement is appearring in continuous 5 descending sub frames after the CSI-RS resource location starts carrying out in the high level indication of UE, UE does the measurement of RSSI on all OFDM symbols of these subframes, then the result measured on all subframes is done sums on average.
Further, the basic principle that UE side higher layer message selects different measuring positions to do measurement is: guarantee the measurement of UE CSI-RS RSSI on the OFDM of sufficient amount symbol.Such as, if the CSI-RS Resource Density that eNB configures to UE less (as 80ms on time domain distributes a CSI-RS resource), the high level of UE can the configuration UE physical layer be measured more OFDM symbol or subframe near the position of CSI-RS appearance.
Step 33, UE physical layer, according to formula RSRQ=N*RSRP/RSSI, calculate the measured value of CSI-RSRSRQ, and wherein, N is the quantity of the Resource Block RB on systematic survey received signal strength indicator rssi measurement bandwidth.
It should be noted that, in another embodiment of the present invention, before step S301, also comprise:
Step S300, the ability rating that base station reports according to UE, judge whether the UE of current service has the ability of supporting descending CoMP communication, if UE does not have the ability of supporting CoMP communication, exits, and do not carry out follow-up operation; If UE has the ability of CoMP communication carries out step S301.
The present embodiment, the RRC signaling that includes CSI-RS resource management collection configuration information sent by receiving base station, and indicate according to the CSI-RS resource distribution in CSI-RS resource management collection configuration information, carry out the measurement of CSI-RS Reference Signal Received Quality RSRQ on specific position, with in prior art only the CSI-RS place the measurement of carrying out signal quality of OFDM character position compare, can improve the certainty of measurement to the CSI-RS RSRQ of each downlink point, and implementation complexity is low, also indirectly improved the spectrum efficiency of system.
An optimum embodiment who realizes the measurement of CSI-RS Reference Signal Received Quality RSRQ below is provided, and as shown in Figure 8, in the present embodiment, descending multi-point signal mass measuring method comprises:
Particularly, frequency domain position on the subframe position that UE occurs according to the indicated CSI-RS of described CSI-RS resource distribution, CSI-RS place OFDM character position, CSI-RS place RB, signal power on all CSI-RS subcarriers that measured by the CSI-RS on the Measurement bandwidth of described antenna port, then the performance number all these measured is carried out arithmetic average, obtains the measured value of CSI-RS RSRP on corresponding CSI-RS resource.
It should be noted that, detailed CSI-RS RSRP method of measurement can, referring to the step 31 of the embodiment of the present invention one, repeat no more herein.
Particularly, the embodiment of the present invention provides the method for measurement of three kinds of CSI-RS RSSI: the measuring position of signaling indication Network Based or the measuring position based on described UE higher layer message indication or the method for measurement of indicating according to described UE higher layer message are carried out the received signal strength indicator rssi measurement of CSI-RS, below these three kinds of methods are done to a detailed description.
Consider under descending CoMP scene, all downlink points are almost time, Frequency Synchronization, so the result of the CRS RSSI measured based on CRS in mobile management, can think to the greatest extent identical like the measurement result based on CSI-RS when being CoMP, therefore in one embodiment of the invention, the method for measurement of a kind of simple and effective CSI-RS RSSI is directly to use CRS rssi measurement unit result;
Figure 6 shows that and use CRS rssi measurement unit method block diagram as a result, according to Fig. 6, the method mainly comprises:
The RRC signaling that includes CSI-RS resource management collection configuration information that step 1:UE issues from the eNB received, and obtain the CSI-RS resource.
Step 2:UE, in the measuring unit of CSI-RS RSSI, directly reads the RSSI value that the physical layer with current time the last time measures based on CRS port 0, as the physical layer measured value of CSI-RS RSSI from UE side shifting administrative unit.
In another embodiment of the present invention, UE can be Network Based the measuring position of signaling indication, carry out the CSI-RS rssi measurement, obtain CSI-RS rssi measurement value;
Particularly, eNB, by special RRC signaling, gives the specific RRC signaling of UE configuration UE, in this RRC signaling, includes the position Indication message, is used to refer to the measurement of being CSI-RS RSRQ on which position in the subframe occurred at CSI-RS.The position of position Indication message indication is here divided again two kinds, a kind of refer to be shown on which OFDM symbol do measurement.The position of indication can be whole OFDM symbols of 2 time slots in certain subframe or a part of OFDM symbol wherein.For instance, as shown in Figure 7, if eNB by the RRC signal deployment character position the measured OFDM symbol 3,4,5,6 that is time slot 0 and whole OFDM symbols of time slot 1, UE does the measurement of RSSI on 10 OFDM symbols altogether at this, and then these 10 RSSI values are done sums on average, obtain final CSI-RS rssi measurement value.Here further illustrate the method for measurement of RSSI.The Measurement bandwidth of supposing RSSI is 50RB, in the LTE agreement, always has 12 subcarriers on each RB.Calculate the arithmetic average of sub-carrier power on each RB on each OFDM symbol, then the power on all 50 RB in Measurement bandwidth on this OFDM symbol is done to addition, obtain a RSSI value on the OFDM symbol.Perhaps when the CSI-RSSI measurement is appearring in continuous 5 descending sub frames after the CSI-RS resource location starts carrying out in the indication of RRC signaling, the position of UE all OFDM symbols on these subframes is measured, and then the result measured on all subframes is done sums on average.
Described calculation is stated on average, and hypothesis has M number a1, a2 ..., aM, mean value a=(a1+a2+...+aM)/M is stated in the calculation of this M number.
The indication of another kind of position is that eNB does the measurement of RSRQ by special RRC signaling indication on which descending sub frame.UE, according to the RRC signaling of eNB configuration, carries out the measurement of RSSI value to the OFDM symbol on all subframes of signaling indication, and then UE carries out arithmetic average to the RSSI measured on all subframes, obtains final CSI-RS rssi measurement value.
It should be noted that, do the measurement of CSI-RS RSRQ on which position in the subframe that eNB can indicate UE to occur at CSI-RS by special RRC signaling; ENB also can also be included in the position Indication message in the lump in this RRC signaling when sending CSI-RS resource management collection configuration information by the radio resource control RRC signaling, sends to corresponding UE.
In another embodiment, can also indicate to select different measuring positions to do the CSI-RS rssi measurement according to UE side higher layer message, obtain CSI-RS rssi measurement value;
It should be noted that, owing to measuring RSSI, do not need to indicate the position of frequency domain, so which subframe is the UE higher layer message only need to be indicated to or the measurement of which OFDM symbol gets final product.Therefore, the positional information of described UE higher layer message indication mainly comprises: the subframe numbers of CSI-RS RSSI antenna end slogan, measurement and/or the OFDM symbol in described subframe numbers;
Particularly, when not using above-mentioned two kinds of methods, the OFDM symbolic number that the high level of UE can self-defining be measured or need the subframe position of measuring, and the physical layer that the OFDM character position of needs being measured by interlayer message is issued UE is measured.In OFDM symbol 3,5,6 as the high level of UE indication UE in the time slot 0 of CSI-RS resource place subframe and the OFDM symbol 2,3,5,6 in time slot 1, measured.The UE physical layer is carried out the measurement of RSSI by above-mentioned indicated OFDM position, after measuring, then each RSSI value measured on above-mentioned OFDM symbol is carried out to arithmetic average.Perhaps when the CSI-RSSI measurement is appearring in continuous 5 descending sub frames after the CSI-RS resource location starts carrying out in the high level indication of UE, UE does the measurement of RSSI on all OFDM symbols of these subframes, then the result measured on all subframes is done sums on average.
Further, the basic principle that UE side higher layer message selects different measuring positions to do measurement is: guarantee the measurement of UE CSI-RS RSSI on the OFDM of sufficient amount symbol.Such as, if the CSI-RS Resource Density that eNB configures to UE less (as 80ms on time domain distributes a CSI-RS resource), the high level of UE can the configuration UE physical layer be measured more OFDM symbol or subframe near the position of CSI-RS appearance.
The present embodiment, the RRC signaling that includes CSI-RS resource management collection configuration information sent by receiving base station, and indicate according to the CSI-RS resource distribution in CSI-RS resource management collection configuration information, carry out the measurement of CSI-RS Reference Signal Received Quality RSRQ on specific position, with in prior art only the CSI-RS place the measurement of carrying out signal quality of OFDM character position compare, can improve the certainty of measurement to the CSI-RS RSRQ of each downlink point, and implementation complexity is low, also indirectly improved the spectrum efficiency of system.
Embodiment bis-
Fig. 9 shows the structured flowchart of the descending multi-point signal apparatus for measuring quality that the embodiment of the present invention two provides, in the present embodiment, this device can be the unit of software unit, hardware cell or software and hardware combining in subscriber equipment, for subscriber equipment, channel state information reference signals CSI-RS Reference Signal Received Quality RSRQ is measured; Described subscriber equipment can form wireless communication system with base station and a plurality of downlink point, and described device comprises: receiving element 91, demodulating unit 92, the first measuring unit 93, the second measuring unit 94 and computing unit 95.
Wherein, receiving element 91, the CSI-RS resource management collection configuration information sent by the radio resource control RRC signaling for receiving base station, described CSI-RS resource management collection configuration information comprises: CSI-RS antenna end slogan, CSI-RS resource distribution, and the sub-frame configuration of each CSI-RS resource;
Particularly, CSI-RS resource management collection configuration information is pre-configured by eNB, in one embodiment, eNB (is that eNB can pass through information of adjacent cells according to topology of networks, and OAM (Operation Administration Maintenance, operation management maintain) interface obtains the list that is connected of the adjacent sending node adjacent with this eNB, which community is arranged with own adjacent around knowing) carry out the particular UE configuration CSI-RS resource management collection for the eNB service, then eNB sends to UE by this CSI-RS resource management collection by the specific RRC signaling of UE.
Wherein, CSI-RS resource management collection configuration information comprises: CSI-RS antenna end slogan, CSI-RS resource distribution, the sub-frame configuration of each CSI-RS resource; Wherein, the CSI-RS resource distribution is a kind of indication information, is used to refer to the OFDM character position that CSI-RS occurs in subframe, and the sub-carrier positions occurred on each RB in frequency domain; The sub-frame configuration of CSI-RS resource means period of sub-frame and the subframe skew that the CSI-RS signal occurs;
In another embodiment, CSI-RS resource management collection configuration information also further comprises: carry out the initial cell identification information (being labeled as X) of the sequence scrambler initialization needs of CSI-RS reference signal generation, the CSI-RS number of resources.
The first measuring unit 93, for the CSI-RS resource distribution according to described CSI-RS resource management collection configuration information indication, and the sub-frame configuration of each CSI-RS resource, measured the Reference Signal Received Power RSRP measured value of CSI-RS by antenna port corresponding to described CSI-RS antenna end slogan;
Particularly, frequency domain position on the subframe position that the first measuring unit 93 occurs according to the indicated CSI-RS of described CSI-RS resource distribution, CSI-RS place OFDM character position, CSI-RS place RB, signal power on all CSI-RS subcarriers that measured by the CSI-RS on the Measurement bandwidth of described antenna port, then the performance number all these measured is carried out arithmetic average, obtains the measured value of CSI-RSRSRP on corresponding CSI-RS resource.
It should be noted that, the specific works flow process of the first measuring unit 93 can, with reference to the step 31 in the embodiment of the present invention one, repeat no more herein.
The second measuring unit 94, for the measuring position of signaling indication Network Based, or the measuring position based on described UE higher layer message indication, or the method for measurement based on described UE higher layer message indication, carry out the received signal strength indicator rssi measurement of CSI-RS, obtain CSI-RS rssi measurement value;
Particularly, in one embodiment, the second measuring unit 94 can select different measuring positions to carry out the CSI-RS rssi measurement according to the positional information of described subscriber equipment higher layer message indication, obtains the CSI-RSRSSI measured value; The positional information of wherein said subscriber equipment higher layer message indication comprises: the subframe numbers of CSI-RS RSSI antenna end slogan, measurement and/or the OFDM symbol in described subframe numbers.
In another embodiment, at first the second measuring unit 94 receives the measuring position information that base station sends by the RRC signaling, and this measuring position information comprises that described the second measuring unit carries out the OFDM character position at measurement place of CSI-RS RSSI and/or the subframe at the measurement place that described UE carries out CSI-RS RSSI;
Then, the second measuring unit 94 carries out the CSI-RS rssi measurement in the position of above-mentioned measuring position information indication, obtains CSI-RS rssi measurement value.
In another embodiment, the second measuring unit 94 also can only read the RSSI value with current time the last time from described user equipment side mobility management unit, measured value as CSI-RS RSSI, wherein, the physical layer that this RSSI value is described UE measures based on public reference signal CRS port 0.
It should be noted that, the specific works flow process of the second measuring unit 94 can, with reference to the step 32 in the embodiment of the present invention one, repeat no more herein.
The subscriber equipment that the embodiment of the present invention provides can be applied in the embodiment of the method one of aforementioned correspondence, and details are described referring to above-described embodiment one, do not repeat them here.
In the embodiment of the present invention two, the RRC signaling that includes CSI-RS resource management collection configuration information sent by receiving base station, and indicate according to the CSI-RS resource distribution in CSI-RS resource management collection configuration information, carry out the measurement of CSI-RS Reference Signal Received Quality RSRQ on specific position, with in prior art only the CSI-RS place the measurement of carrying out signal quality of OFDM character position compare, under the less situation of the density that can occur at CSI-RS, guarantee the certainty of measurement of CSI-RS RSRQ, thereby improve the certainty of measurement to the CSI-RS RSRQ of each downlink point, and implementation complexity is low, also indirectly improved the spectrum efficiency of system.
It should be noted that in said apparatus embodiment, included unit is just divided according to function logic, but is not limited to above-mentioned division, as long as can realize corresponding function; In addition, the concrete title of each functional unit also, just for the ease of mutual differentiation, is not limited to protection scope of the present invention.
In addition, one of ordinary skill in the art will appreciate that all or part of step realized in the various embodiments described above method is to come the hardware that instruction is relevant to complete by program, corresponding program can be stored in a computer read/write memory medium, described storage medium, as ROM/RAM, disk or CD etc.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, all any modifications of doing within the spirit and principles in the present invention, be equal to and replace and improvement etc., within all should being included in protection scope of the present invention.
Claims (12)
1. a descending multi-point signal mass measuring method, is characterized in that, comprising:
User equipment (UE) receives the channel state information reference signals CSI-RS resource management collection configuration information that base station sends by the radio resource control RRC signaling, described CSI-RS resource management collection configuration information comprises: CSI-RS antenna end slogan, CSI-RS resource distribution, and the sub-frame configuration of each CSI-RS resource;
The described RRC signaling of UE demodulation, obtain CSI-RS resource management collection configuration information;
CSI-RS resource distribution according to described CSI-RS resource management collection configuration information indication, and the sub-frame configuration of each CSI-RS resource, measured the Reference Signal Received Power RSRP measured value of CSI-RS by antenna port corresponding to described CSI-RS antenna end slogan;
The measuring position of signaling Network Based indication, or the measuring position based on described UE higher layer message indication, or the method for measurement based on described UE higher layer message indication, carry out the received signal strength indicator rssi measurement of CSI-RS, obtains CSI-RS rssi measurement value;
According to formula RSRQ=N*RSRP/RSSI, calculate the measured value of CSI-RS RSRQ, wherein, N is the Resource Block RB quantity of measuring on the bandwidth of received signal strength indicator RSSI place, RSRP is CSI-RS RSRP measured value, and RSSI is CSI-RS rssi measurement value.
2. the method for claim 1, is characterized in that, in described RRC signaling, also comprises: the position Indication message, and described position Indication message is used to indicate the position that described UE carries out the CSI-RS rssi measurement; The CSI-RS rssi measurement is carried out in the measuring position of described signaling indication Network Based, obtains the CSI-RSRSSI measured value, specifically comprises:
Described UE, according to the position Indication message comprised in described RRC signaling, carries out the CSI-RS rssi measurement in the measuring position of described position Indication message indication, obtains CSI-RS rssi measurement value.
3. method as claimed in claim 2, it is characterized in that, the measuring position of described position Indication message indication specifically comprises: described UE carries out the OFDM character position at measurement place of CSI-RS RSSI and/or the subframe at the measurement place that described UE carries out CSI-RS RSSI.
4. the method for claim 1, is characterized in that, the CSI-RS rssi measurement is carried out in the measuring position of described signaling indication Network Based, obtains CSI-RS rssi measurement value, specifically comprises:
Described UE receives the measuring position information that base station sends by the RRC signaling, and described measuring position information comprises that described UE carries out the OFDM character position at measurement place of CSI-RS RSSI and/or the subframe at the measurement place that described UE carries out CSI-RS RSSI;
Described UE carries out the CSI-RS rssi measurement in the position of described measuring position information indication, obtains CSI-RS rssi measurement value.
5. the method for claim 1, is characterized in that, the CSI-RS rssi measurement is carried out in the described measuring position based on described UE higher layer message indication, obtains CSI-RS rssi measurement value value, specifically comprises:
The physical layer of described UE selects different measuring positions to carry out the CSI-RS rssi measurement according to the positional information of described UE higher layer message indication, obtain CSI-RS rssi measurement value, the positional information of wherein said UE higher layer message indication comprises: the subframe numbers of CSI-RS RSSI antenna end slogan, measurement and/or the OFDM symbol in described subframe numbers.
6. the method for claim 1, is characterized in that, the described method of measurement based on described UE higher layer message indication is carried out the CSI-RS rssi measurement, obtains CSI-RS rssi measurement value, specifically comprises:
Described UE directly reads the RSSI value with current time the last time from UE side shifting administrative unit, and as the measured value of CSI-RS RSSI, wherein, the physical layer that described RSSI value is described UE measures based on public reference signal CRS port 0.
7. as the described method of claim 1-6 any one, it is characterized in that, the described CSI-RS resource distribution according to described CSI-RS resource management collection configuration information indication, and the sub-frame configuration of each CSI-RS resource, measured the Reference Signal Received Power RSRP measured value of CSI-RS by antenna port corresponding to described CSI-RS antenna end slogan, specifically comprise:
Frequency domain position on the subframe position occurred according to the indicated CSI-RS of described CSI-RS resource distribution, CSI-RS place OFDM character position, CSI-RS place RB, signal power on all CSI-RS subcarriers that measured by the CSI-RS on the Measurement bandwidth of described antenna port, then the performance number all these measured is carried out arithmetic average, obtains the measured value of CSI-RS RSRP on corresponding CSI-RS resource.
8. a descending multi-point signal apparatus for measuring quality, measured channel state information reference signals CSI-RS Reference Signal Received Quality RSRQ for subscriber equipment, it is characterized in that, described device comprises:
Receiving element, the CSI-RS resource management collection configuration information sent by the radio resource control RRC signaling for receiving base station, described CSI-RS resource management collection configuration information comprises: CSI-RS antenna end slogan, CSI-RS resource distribution, and the sub-frame configuration of each CSI-RS resource;
Demodulating unit, the RRC signaling received for the described receiving element of demodulation, obtain CSI-RS resource management collection configuration information;
The first measuring unit, for the CSI-RS resource distribution according to described CSI-RS resource management collection configuration information indication, and the sub-frame configuration of each CSI-RS resource, measured the Reference Signal Received Power RSRP measured value of CSI-RS by antenna port corresponding to described CSI-RS antenna end slogan;
The second measuring unit, for the measuring position of signaling indication Network Based, or the measuring position based on described UE higher layer message indication, or the method for measurement based on described UE higher layer message indication, carry out the received signal strength indicator rssi measurement of CSI-RS, obtain CSI-RS rssi measurement value;
Computing unit, for according to formula RSRQ=N*RSRP/RSSI, calculate the measured value of CSI-RS RSRQ, wherein, N is the quantity of measuring the Resource Block RB of received signal strength indicator RSSI place bandwidth, and RSRP is CSI-RS RSRP measured value, and RSSI is CSI-RS rssi measurement value.
9. device as claimed in claim 8, is characterized in that, described the second measuring unit specifically for:
According to the positional information of described subscriber equipment higher layer message indication, select different measuring positions to carry out the CSI-RS rssi measurement, obtain CSI-RS rssi measurement value, the positional information of wherein said subscriber equipment higher layer message indication comprises: the subframe numbers of CSI-RS RSSI antenna end slogan, measurement and/or the OFDM symbol in described subframe numbers.
10. device as claimed in claim 8, is characterized in that, described the second measuring unit specifically for:
Read the RSSI value with current time the last time from described user equipment side mobility management unit, as the measured value of CSI-RS RSSI, wherein, the physical layer that described RSSI value is described UE measures based on public reference signal CRS port 0.
11. device as claimed in claim 8, is characterized in that, described the second measuring unit specifically for:
Receive the measuring position information that base station sends by the RRC signaling, described measuring position information comprises that described the second measuring unit carries out the OFDM character position at measurement place of CSI-RS RSSI and/or the subframe at the measurement place that described UE carries out CSI-RS RSSI;
The CSI-RS rssi measurement is carried out in position in the indication of described measuring position information, obtains CSI-RS rssi measurement value.
12. as the described device of claim 8-11 any one, it is characterized in that, described the first measuring unit specifically for:
Frequency domain position on the subframe position occurred according to the indicated CSI-RS of described CSI-RS resource distribution, CSI-RS place OFDM character position, CSI-RS place RB, signal power on all CSI-RS subcarriers that measured by the CSI-RS on the Measurement bandwidth of described antenna port, then the performance number all these measured is carried out arithmetic average, obtains the measured value of CSI-RS RSRP on corresponding CSI-RS resource.
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Also Published As
| Publication number | Publication date |
|---|---|
| WO2013170690A1 (en) | 2013-11-21 |
| CN103428749B (en) | 2016-06-15 |
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