CN102857279A - Method and system for measuring channel quantity in coordinated multipoint system - Google Patents
Method and system for measuring channel quantity in coordinated multipoint system Download PDFInfo
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- CN102857279A CN102857279A CN2011101821473A CN201110182147A CN102857279A CN 102857279 A CN102857279 A CN 102857279A CN 2011101821473 A CN2011101821473 A CN 2011101821473A CN 201110182147 A CN201110182147 A CN 201110182147A CN 102857279 A CN102857279 A CN 102857279A
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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
- H04L1/02—Arrangements for detecting or preventing errors in the information received by diversity reception
- H04L1/06—Arrangements for detecting or preventing errors in the information received by diversity reception using space diversity
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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
- H04L1/0001—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
- H04L1/0027—Scheduling of signalling, e.g. occurrence thereof
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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
- H04L1/0028—Formatting
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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
- H04L1/20—Arrangements for detecting or preventing errors in the information received using signal quality detector
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0032—Distributed allocation, i.e. involving a plurality of allocating devices, each making partial allocation
- H04L5/0035—Resource allocation in a cooperative multipoint environment
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
Abstract
The invention provides a method and a system for measuring channel quantity in a coordinated multipoint system. The coordinated multipoint system comprises multiple coordinated points. The method includes determining a channel state indicating reference signal configuration parameter by a main coordinated point of the multiple coordinated points; determining subframes for sending channel state indicating reference signals by the other multiple coordinated points according to the channel state indicating reference signal configuration parameter; sending the channel state indicating reference signals on the determined subframes by all the coordinated points, and then measuring channel quantity by user equipment according the channel state indicating reference signals. The subframes, for sending the channel state indicating reference signals, determined by the coordinated points according to the channel state indicating reference signal configuration parameter, are different mutually. Quantity of corresponding channels can be detected by the user equipment according to CSI-RS(channel state information-reference signals) from different coordinated points, the MIMO(multiple input and multiple output) technology cannot be limited to single cells but can be jointly processed and coordinated for multiple cells.
Description
Technical field
The present invention relates to wireless communication technology, a kind of method and system that in Synergistic multi-point system, carries out channel quality measurement.
Background technology
Along with the fast development of wireless communication technology, the frequency spectrum resource of wretched insufficiency becomes the principal element of restriction Development of Wireless Communications gradually, how to take full advantage of limited frequency spectrum resource, and improving the availability of frequency spectrum is the important research direction of radio communication.Multiple-input and multiple-output (Multiple Input Multiple Out, MIMO) technology can be in the situation that do not increase that bandwidth improves efficiency of transmission and the availability of frequency spectrum obtains extensive favor because of it.The MIMO technology has been utilized space diversity gain by transmit diversity and receive diversity, has utilized antenna array gain by beam forming (Beamforming) technology, has utilized the spatial reuse gain by space multiplexing technique.Wherein, obtain the weak dependence that space diversity gain utilizes space channel, and the selectivity on binding time/frequency, transmit diversity provides more copy for the transmission of signal, receive diversity is to have received a plurality of copies that transmit in the space, and then improve the reliability of signal transmission, thereby improve the space-frequency block codes (Space Frequency Block Code) of the signal to noise ratio that receives signal-for example; Obtain antenna array gain and utilize the strong correlation of space channel, by little spacing aerial array is installed, thereby so that producing, the electromagnetic wave that transmits in the space interferes the antenna pattern that forms highly directive, so that the main lobe of antenna pattern points to arrival bearing user adaptively, thereby the raising signal to noise ratio improves the single current beam forming (Single Stream Beamforming) of power system capacity or coverage-for example; Obtaining the spatial reuse gain is the weak dependence that utilizes space channel, transmit different data flow at a plurality of separate space channels, thereby improve multi-user's multiple-input and multiple-output (Mutiple User MIMO, the MU-MIMO) technology of the peak rate of transfer of data-for example.Obviously, the use of MIMO technology depends critically upon characteristic and the measurement thereof of space channel.
At Long Term Evolution version (LTE Release, Long Term Evolution Release) in 8/9, for the quality of space channel being measured and the data symbol that receives being carried out demodulation, introduced public reference signal (CRS, Common Reference Signal), subscriber equipment (UE, User Equipment) can carry out by CRS the measurement of channel, for subscriber equipment provides basic channel information with base station selected different MIMO transmission mode, in LTE Release 8/9, realized the measurement of terminal to channel by CRS, realized that also terminal sends the demodulation of data to residential quarter (Cell); The transmission mode that can support comprises diversity, open loop Single User MIMO (Single User MIMO, SU-MIMO), beam forming, closed loop Single User MIMO and closed loop MU-MIMO.
The inventor finds prior art, and there are the following problems: do not have based on coordinate multipoint (CoMP in the prior art, Coordinate Multiple Point), and in the situation that to the transparent concrete technical scheme that realizes that multi-plot joint is processed and coordinate by CSI-RS of subscriber equipment.
Summary of the invention
The technical problem to be solved in the present invention provides a kind of method and system that carries out channel quality measurement in Synergistic multi-point system, be used for solving prior art, the CSI-RS that passes through based on coordinate multipoint does not realize that multi-plot joint is processed and the defective of the concrete technology of coordination.
For solving the problems of the technologies described above, embodiments of the invention provide a kind of method that the channel quality of coordinate multipoint is measured, and method comprises: the main cooperation point in a plurality of described cooperation points is determined channel status indication reference signal configuration parameter; A plurality of described cooperation points are determined the subframe of transmitting channel state indication reference signal according to described channel status indication reference signal configuration parameter; All cooperation points are different according to the subframe of the described channel status indication of the transmission reference signal that channel status indication reference signal configuration parameter is determined; All cooperation points send described channel status indication reference signal in the subframe of determining, so that subscriber equipment is measured channel quality according to described channel status indication reference signal.
In the described method, described a plurality of cooperation points comprise main cooperation point and from cooperation point, described main cooperation point generates described channel status indication reference signal configuration parameter, and send to described channel status indication reference signal configuration parameter described from cooperation point; A plurality of described cooperation points determine that according to described channel status indication reference signal configuration parameter the subframe of transmitting channel state indication reference signal also comprises: described main cooperation point determines self to send subframe and the reference signal sequence of described channel status indication reference signal according to described channel status indication reference signal configuration parameter; Described subframe and the reference signal sequence of determining self to send described channel status indication reference signal from the cooperation point basis from the described channel status indication reference signal configuration parameter of described main cooperation point.
In the described method, the described reference signal sequence that sends the use of described channel status indication reference signal from cooperation point, the reference signal sequence that sends the use of described channel status indication reference signal with described main cooperation point is identical.
In the described method, described channel status indication reference signal configuration parameter comprises the transmission cycle and sends biasing; Be P when the described transmission cycle of described main cooperation point
A, and described transmission is biased to P
A-OffsetThe time, comprise the total M of a main cooperation point cooperation point, 1＜M＜16, described main cooperation point is floor (t in the subframe sequence number
f/ (MP
A))+P
A-OffsetDescending sub frame on send described channel status indication reference signal, wherein, t
fBe the original sequence number of subframe, since 0 counting, described floor () is lower rounding operation; M is mP from cooperation point in the subframe sequence number
A+ floor (t
f/ (MP
A))+P
A-OffsetDescending sub frame on send described channel status indication reference signal, m is since 1 counting.
In the described method, all cooperation points send described channel status indication reference signal in the subframe of determining and also comprise: within the continuous described transmission cycle, described main cooperation point is used different transmission antennas transmit described channel status indication reference signal from cooperation point at the identical resource location of different subframes with described; Described different transmitting antenna comprises transmitting antenna and each transmitting antenna from cooperation point of main cooperation point.
In the described method, subscriber equipment also comprises after according to described channel status indication reference signal channel quality being measured: described main cooperation point receives the described channel quality information of described subscriber equipment feedback; Wherein, for comprising main cooperation point and from each described cooperation point of cooperation point, the described channel status indication reference signal that described channel quality information is sent according to this cooperation point by described subscriber equipment and/or can use channel status indication sets of reference signals to generate.
In the described method, described main cooperation point receives the channel quality information of described subscriber equipment feedback in the following way: described main cooperation point periodicity or aperiodicity receive the channel quality information of described subscriber equipment feedback; Wherein, when aperiodicity receives described channel quality information, finished before next cooperation point sends described channel status indication reference signal by described subscriber equipment and to measure and feed back channel quality information between current cooperation point and the described subscriber equipment.
In the described method, after described main cooperation point receives described channel quality information, to send all or part of described channel quality information from cooperation point.
In the described method, described channel quality information comprises: pre-coding matrix index, channel quality information indication and/or order indication.
A kind of system that the channel quality of coordinate multipoint is measured comprises a plurality of cooperation points, and wherein, a cooperation point comprises: dispensing unit is used for determining channel status indication reference signal configuration parameter; The subframe determining unit is used for indicating the reference signal configuration parameter to determine the subframe of transmitting channel state indication reference signal according to described channel status; All cooperation points are different according to the subframe of the described channel status indication of the transmission reference signal that channel status indication reference signal configuration parameter is determined; The first communication unit is used for sending described channel status indication reference signal in the subframe of determining, so that subscriber equipment is measured channel quality according to described channel status indication reference signal.
In the described system, cooperation point also comprises: switch unit, be used for notifying described dispensing unit when described cooperation point during as main cooperation point, and produce described channel status by dispensing unit and indicate the reference signal configuration parameter; The second communication unit is used for described channel status indication reference signal configuration parameter is sent to from cooperation point.
In the described system, the described subframe determining unit of described cooperation point also comprises: the first subframe unit, when being used for described cooperation point as main cooperation point, determine that the described transmission cycle is P
A, and described transmission is biased to P
A-OffsetThe time, comprise that main cooperation point has M cooperation point, 1＜M＜16, described main cooperation point is floor (t in the subframe sequence number
f/ (MP
A))+P
A-OffsetDescending sub frame on send described channel status indication reference signal, wherein, t
fBe the original sequence number of subframe, since 0 counting, described floor () is lower rounding operation; The second subframe unit is used for described cooperation point described during from cooperation point as m, is mP in the subframe sequence number
A+ floor (t
f/ (MP
A))+P
A-OffsetDescending sub frame on send described channel status indication reference signal, m is since 1 counting.
The beneficial effect of technique scheme of the present invention is as follows: main cooperation point is determined to send the required transmission cycle of CSI-RS and is sent biasing, main cooperation point and from cooperation point according to the transmission cycle with send the subframe that biasing determines to send separately CSI-RS, detect channel quality by UE according to the CSI-RS from different cooperation points, UE can realize down collaboration multiple spot technology by CSI-RS, wherein, the CoMP technology makes the MIMO technology no longer be confined to single residential quarter, but can process and coordination by multi-plot joint.
Description of drawings
Fig. 1 is the method flow schematic diagram that the embodiment of the invention is measured the channel quality of coordinate multipoint;
Fig. 2 is the network topology schematic diagram of 2 cooperation point transmitting channels of embodiment of the invention state indication reference signal;
Fig. 3 is that 2 cooperation points of the embodiment of the invention are determined subframe and sent the schematic diagram of CSI-RS;
Fig. 4 is that 3 cooperation points of the embodiment of the invention are determined subframe and sent the schematic diagram of CSI-RS;
Fig. 5 is that 2 cooperation points of the embodiment of the invention are determined subframe and send CSI-RS and receive to feed back schematic diagram.
Embodiment
For making the technical problem to be solved in the present invention, technical scheme and advantage clearer, be described in detail below in conjunction with the accompanying drawings and the specific embodiments.
Two kinds of new reference signals have been defined among the LTE Release 10: channel status indication reference signal (CSI-RS, Channel State Indication-Reference Signal) and demodulated reference signal (DMRS, Demodulation Reference Signal), main purpose is further to optimize the expense of channel measurement and the flexibility ratio that improves channel measurement and demodulation.Wherein, CSI-RS is exclusively used in the measurement of channel, can calculate UE by the measurement to CSI-RS need to be to the pre-coding matrix index (PMI of Cell feedback, Precoding Matrix Indicator), channel quality information indication (CQI, Channel Quality Indicator) and order indication (RI, Rank Indicator); CSI-RS is sparse in the distribution of time domain and frequency domain, and guarantee at a Resource Block (RB, Resource Block) pilot density that only comprises a CSI-RS of each antenna port of Serving cell in, and in time domain required with the integral multiple of the 5ms cycle as CSI-RS.Sparse CSI-RS can support 8 antenna configurations of single Cell, and has advantageously supported the adjacent cell measurement configuration.
CSI-RS also has an advantage, be further raising the residential quarter average availability of frequency spectrum, especially the cell edge availability of frequency spectrum possibility is provided, because CSI-RS provides possibility for the application of CoMP technology, the CoMP technology makes the MIMO technology no longer be confined to single residential quarter, but can process and coordination by multi-plot joint.The CoMP technology mainly comprises two kinds of forms: unite emission (Joint Transmission, JT): data are by each cooperation point Combined Treatment, and namely the data of each UE are united emission by all cooperation points, improve the quality of reception to eliminate to disturb.Cooperative scheduling/cooperative beam figuration (CoordinatedScheduling/Coordinated Beamforming, CS/CB): data are only from the Serving cell emission, but UE scheduling or BF mode are jointly to be finished by cooperation point.The CoMP Technology Need is known more channel quality information, and for example, the associating lift-off technology requires each UE to its cooperation point feedback channel information, and cooperation point associating or Independent Decisiveness are to pre-coding matrix or the vector of this UE.In R8 and R9, because CRS is that the residential quarter is proprietary, the CoMP technology is impossible realize, but can realize UE to the channel measurement of a plurality of cooperation points and feed back metrical information by CSI-RS by the coordination between Cell in R10.
The embodiment of the invention provides a kind of method of carrying out channel quality measurement in Synergistic multi-point system, and described Synergistic multi-point system comprises a plurality of cooperation points, and as shown in Figure 1, method comprises:
The technological means that provides is provided, main cooperation point determines to send the required channel status indication reference signal configuration parameter of CSI-RS, this channel status indication reference signal configuration parameter has specifically determined to send the concrete subframe of CSI-RS, main cooperation point and determine to send separately the subframe of CSI-RS from cooperation point according to channel status indication reference signal configuration parameter, all can be detected the channel quality of corresponding channel according to the CSI-RS from different cooperation points by UE, so that the MIMO technology no longer is confined to single residential quarter, but can process and coordination by multi-plot joint.
In the embodiment of the invention, when the appellation of all cooperation points occurring, these all cooperation points comprised main cooperation point and other from cooperation point; A plurality of cooperation points also are to comprise main cooperation point and from cooperation point.
In a preferred embodiment, a plurality of cooperation points comprise main cooperation point and from cooperation point, described main cooperation point generates described channel status indication reference signal configuration parameter, and send to described channel status indication reference signal configuration parameter described from cooperation point; A plurality of described cooperation points determine that according to described channel status indication reference signal configuration parameter the subframe of transmitting channel state indication reference signal also comprises: described main cooperation point determines self to send the subframe of described channel status indication reference signal according to described channel status indication reference signal configuration parameter; The described subframe of determining self to send described channel status indication reference signal from the cooperation point basis from the described channel status indication reference signal configuration parameter of described main cooperation point.
Channel status indication reference signal configuration parameter comprises the transmission cycle and sends biasing; Be P when the described transmission cycle of main cooperation point
A, and described transmission is biased to P
A-OffsetThe time, comprise the total M of a main cooperation point cooperation point, 1＜M＜16, described main cooperation point is floor (t in the subframe sequence number
f/ (MP
A))+P
A-OffsetDescending sub frame on send described channel status indication reference signal, wherein, t
fBe the original sequence number of subframe, since 0 counting, described floor () is lower rounding operation; M is mP from cooperation point in the subframe sequence number
A+ floor (t
f/ (MP
A))+P
A-OffsetDescending sub frame on send described channel status indication reference signal, m is since 1 counting.
Add up to M as example take main cooperation point and each from cooperation point, determining the transmission cycle when main cooperation point is P
A, the concrete numerical value of described transmission biasing is P
A-OffsetThe time, in theory, a sense cycle is not more than 80 milliseconds, and main cooperation point all can send CSI-RS on any one subframe within a transmission cycle in a sense cycle.For informing clearly the some cooperation points of UE specifically can send a CSI-RS in which subframe, therefore need employing to send biasing and specifically determine a subframe that can send CSI-RS, if P
AValue set be [5,10,20,40,80], P
A-OffsetValue less than P
AConcrete numerical value, P
ABe the P of 5 correspondences
A-OffsetBe the integer between 0～4, the P of 10 correspondences
A-OffsetBe the integer between 0～9, the P of 20 correspondences
A-OffsetBe the integer between 0～19, the P of 40 correspondences
A-OffsetBe the integer between 0～39, the P of 80 correspondences
A-OffsetBe the integer between 0～79, obviously, send the concrete numerical value P of biasing
A-OffsetSpan should contain each subframe in the transmission cycle at current place.
The transmission cycle refers to: a cooperation point sends CSI-RS at every turn and must select appropriate subframe, and can not select arbitrarily a subframe to load and transmission CSI-RS.Cooperation point is according to the transmission cycle and send the appropriate subframe of biasing selection, in each length is not more than 80 milliseconds sense cycle, send M CSI-RS by M cooperation point, namely need to select an appropriate subframe for each cooperation point, therefore, need to determine all for each cooperation point and can send for this cooperation point the subframe of CSI-RS, in other words, can be continuous for the subframe of a cooperation point transmission CSI-RS in theory, number is more than one and limited, then first can be its initial subframe that sends the cycle for the subframe of this cooperation point transmission CSI-RS, after the initial subframe last can be the end subframe for the subframe of this cooperation point transmission CSI-RS, and the transmission cycle has comprised from initial subframe to the end subframe and all subframes them.Then be biased in according to transmission and determine the concrete descending sub frame that is used for sending CSI-RS in all subframes in the transmission cycle.
In an application scenarios, total M cooperation point, 1＜M＜16; M cooperation point both comprised that main cooperation point also comprised from cooperation point:
Main cooperation point is determined the transmission cycle that transmission CSI-RS is required and sends to setover, and transmission cycle and transmission biasing have consisted of channel status indication reference signal configuration parameter;
Main cooperation point issues channel status indication reference signal configuration parameter by the RRC signaling to M-1 from cooperation point after, M cooperation point sends CSI-RS to UE according to channel status indication reference signal configuration parameter on subframe separately, and like this, then UE is every MP
AIndividual subframe is finished a channel quality information of M cooperation point is measured and feedback.
Each cooperation point is carried out following configuration according to channel status indication reference signal configuration parameter to the CSI-RS that will send:
1, the transmission cycle of main cooperation point is P
A, send and be biased to P
A-Offset, therefore, according to the transmission formula floor (t of main cooperation point
f/ (MP
A))+P
A-OffsetM=1 as can be known, the subframe sequence number that main cooperation point sends the descending sub frame of CSI-RS for the first time is P
A-Offset
2, M-1 is individual from cooperation point, m the transmission formula mP from the cooperation point basis from cooperation point
A+ floor (t
f/ (MP
A))+P
A-OffsetThe descending sub frame of determining sends CSI-RS, and its subframe sequence number that sends for the first time the descending sub frame of CSI-RS is P
A+ P
A-Offset, m is since 1 counting.
As shown in Figure 2, in an application scenarios, realize CSI-RS configuration and the transmission of M=2 cooperation point, the cooperation point of general is residential quarter Cell, an evolved base station (evolved Node B, eNB) comprises 3 Cell, gets the cooperation point set in the present embodiment and is [Cell1, Cell2], wherein the Serving cell of UE is Cell1; 2 Cell realize that by configuration CSI-RS UE is to the measurement of the channel quality of 2 Cell.
The situation that 2 Cell send CSI-RS in separately subframe and is used the transmission formula floor (t of main cooperation point as shown in Figure 3
f/ (MP
A))+P
A-Offset, and m the transmission formula mP from the cooperation point basis from cooperation point
A+ floor (t
f/ (MP
A))+P
A-Offset, step comprises:
Step 201, the transmission cycle of the CSI-RS of Cell1 is configured to P
A=5, Cell1 is according to floor (t
f/ (MP
A))+P
A-OffsetDetermined subframe sends CSI-RS 1.
Cell2 is according to mP
A+ floor (t
f/ (MP
A))+P
A-OffsetDetermined subframe sends CSI-RS 2.
Step 202, particularly, the P of 5 correspondences
A-OffsetBe the integer between 0～4, be without loss of generality, get P
A-Offset=1, then main cooperation point Cell1 sends a CSI-RS 1 in subframe 1 as shown in Figure 3, sends a CSI-RS 2 from cooperation point Cell2 in subframe 6.
Obviously Cell1 and Cell2 are at 2P
AFinish the task of respectively launching a CSI-RS in=10 subframes.
Step 203 is at 2P next
AIn=10 subframes, 2 cooperation points [Cell1, Cell2] will be finished the task of launching again CSI-RS, and namely Cell1 sends a CSI-RS 1 in subframe 11, and Cell2 sends a CSI-RS 2 in subframe 16.
In a preferred embodiment, subscriber equipment also comprises after according to described channel status indication reference signal channel quality being measured: main cooperation point receives the described channel quality information of described subscriber equipment feedback; Wherein, for comprising main cooperation point and from each described cooperation point of cooperation point, the described channel status that channel quality information is sent according to this cooperation point by described subscriber equipment is indicated reference signal and can be used channel status indication sets of reference signals to generate, and specifically can adopt channel estimation method to generate described channel quality information.Wherein, each cooperation point can send to UE and can use the CSI-RS set when UE measures this cooperation point; Channel quality information comprises one of following or combination: pre-coding matrix index (PMI, PrecodingMatrix Indicator), channel quality information indication (CQI, Channel Quality Indicator) and order indication (RI, Rank Indicator).
In an application scenarios, as shown in Figure 2, total M=2 cooperation point, the cooperation point of general is Cell, and the Serving cell of UE is Cell1, and the cooperation point set is [Cell1, Cell2].Cell1 and Cell2 are positioned at same site, i.e. two residential quarters that eNB is interior.
Cell1 is in order to realize the cooperation transmission with Cell2, the channel quality information that needs Cell2 to UE, RI for example, PMI and CQI, therefore UE need to measure CSI-RS2, at this moment, the transmission cycle of the configurable Cell1 of Serving cell Cell1 of UE and transmission biasing, and notice Cell2 calculates the corresponding subframe that can send CSI-RS2 according to transmission cycle and transmission biasing, UE can realize measurement and feedback to the channel quality information of Cell1 and Cell2 according to the channel status indication reference signal configuration parameter of Cell1.
In an application scenarios, 2 Cell realize that by configuration CSI-RS UE is to the measurement of the channel quality information of 2 Cell.
The transmission cycle of Cell1 is configured to P
A=5, Cell1 is according to floor (t
f/ (MP
A))+P
A-OffsetDetermined subframe sends the CSI-RS 1 of Cell1, and Cell2 is according to mP
A+ floor (t
f/ (MP
A))+P
A-OffsetDetermined subframe sends the CSI-RS 2 of Cell2.
The P of 5 correspondences
A-OffsetBe the integer between 0～4, be without loss of generality in the present embodiment and get P
A-Offset=1, then Cell1 sends a CSI-RS 1 in subframe 1, and Cell2 sends a CSI-RS 2 in subframe 6.
Obviously, UE is at 2P
A=10 interior channel qualities to 2 cooperation points [Cell1, Cell2] of subframe respectively carry out one-shot measurement.
At 2P next
AIn=10 subframes, UE will carry out the channel quality of 2 cooperation points [Cell1, Cell2] measuring again, and namely Cell1 sends a CSI-RS 1 in subframe 1, and Cell2 sends a CSI-RS 2 in subframe 16.
In an application scenarios, as shown in Figure 4, to realize the configuration of M=3 cooperation point and send CSI-RS, the cooperation point of general is Cell, and the Serving cell of UE is Cell1, and its cooperation point set is [Cell1, Cell2, Cell3].
The situation that 3 Cell send CSI-RS in separately subframe as shown in Figure 4, to realize UE to the measurement of the channel quality information of 3 Cell, the transmission cycle of the CSI-RS of Cell1 is for being configured to P
A=5, Cell1 is according to floor (t
f/ (MP
A))+P
A-OffsetDetermined subframe sends the CSI-RS 1 of Cell1, and Cell2 is according to mP
A+ floor (t
f/ (MP
A))+P
A-Offset, and the CSI-RS 2 of the determined subframe transmission of m=1 Cell2, Cell3 is according to mP
A+ floor (t
f/ (MP
A)), and the determined subframe of m=2 sends the CSI-RS3 of Cell3.Specifically comprise:
P
AThe P of=5 correspondences
A-OffsetBe the integer between 0～4, be without loss of generality, get P
A-Offset=0, then Cell1 sends a CSI-RS 1 in subframe 0, and Cell2 sends a CSI-RS 2 in subframe 5, and Cell3 sends a CSI-RS 3 in subframe 10.
Obviously, UE is at 3P
AIn=15 subframes to each measurement once of the channel quality information of 3 cooperation points [Cell1, Cell2, Cell3].
At 3P next
AIn=15 subframes, 3 cooperation points [Cell1, Cell2, Cell3] are with another emission CSI-RS, and namely Cell1 sends a CSI-RS 15 in subframe 15, and Cell2 sends a CSI-RS 2 in subframe 20, and Cell3 sends a CSI-RS 3 in subframe 25.
In a preferred embodiment, described main cooperation point receives the channel quality information of described subscriber equipment feedback in the following way: described main cooperation point periodicity or aperiodicity receive the channel quality information of described subscriber equipment feedback; Wherein, when aperiodicity receives described channel quality information, finished before next cooperation point sends described channel status indication reference signal by described subscriber equipment and to measure and feed back channel quality information between current cooperation point and the described subscriber equipment.In other words, UE can be to described main cooperation point periodic feedback or the described channel quality information of non-periodic feedback; Wherein, when measuring aperiodic, UE finished measurement and the feedback to the channel quality information between cooperation point i and UE before cooperation point i+1 sends described CSI-RS.
After described main cooperation point receives described channel quality information, to send all or part of described channel quality information from cooperation point.
In an application scenarios, as shown in Figure 5, realize the channel quality measurement of two cell cooperative multiple spots in the station, 2 Cell realize that by configuration CSI-RS UE is to the measurement of the channel quality information of 2 Cell; In measuring process, UE can in good time feedback channel quality information after receiving the CSI-RS that each cooperation point sends.
The transmission cycle that main cooperation point Cell1 sends CSI-RS is configured to P
A=5, Cell1 is according to formula floor (t
f/ (MP
A))+P
A-OffsetThe subframe of determining sends CSI-RS 1, from cooperation point Cell2 according to mP
A+ floor (t
f/ (MP
A))+P
A-Offset, and the definite subframe of m=1 sends the CSI-RS 2 of Cell2.
P
AThe P of=5 correspondences
A-OffsetBe the integer between 0～4, be without loss of generality, get P
A-Offset=1, then Cell1 sends a CSI-RS 1 in subframe 1, and Cell2 sends a CSI-RS 2 in subframe 6.
At 2P next
AIn=10 subframes, UE will finish the again emission of CSI-RS of 2 cooperation points [Cell1, Cell2], and namely Cell1 sends a CSI-RS 1 in subframe 11, and Cell2 sends a CSI-RS 2 in subframe 16.
Obviously, UE is at 2P
A=10 interior each one-shot measurements to 2 cooperation points [Cell1, Cell2] of subframe wherein, in the process that the channel quality to two cooperation points carries out measuring for the first time, comprising:
UE receives from Cell1 behind the CSI-RS 1 that subframe 1 is sent, with CSI-RS 1 with can use the CSI-RS set to generate channel quality information, and before subframe 11 with this channel quality information feedback to cooperation point, specifically be chosen on the subframe 3 and feed back to cooperation point.
UE receives from Cell2 behind the CSI-RS 2 that subframe 6 is sent, with CSI-RS 2 with can use the CSI-RS set to generate channel quality information, and before subframe 11 with this channel quality information feedback to cooperation point, specifically be chosen on the subframe 8 and feed back to cooperation point.
In the process that the channel quality to two cooperation points carries out measuring for the second time, comprising:
UE receives from Cell1 behind the CSI-RS 1 that subframe 11 is sent, with CSI-RS 1 with can use the CSI-RS set to generate channel quality information, and before subframe 16 with this channel quality information feedback to cooperation point, specifically be chosen on the subframe 13 and feed back to cooperation point.
UE receives from Cell2 behind the CSI-RS 2 that subframe 16 is sent, with CSI-RS 2 with can use the CSI-RS set to generate channel quality information, and before subframe 21, give main cooperation point Cell1 with this channel quality information feedback, specifically be chosen on the subframe 18 and feed back to cooperation point.
The embodiment of the invention provides a kind of system that the channel quality of coordinate multipoint is measured, and comprises a plurality of cooperation points, and wherein, a cooperation point comprises:
Dispensing unit is used for determining channel status indication reference signal configuration parameter;
The subframe determining unit is used for indicating the reference signal configuration parameter to determine the subframe of transmitting channel state indication reference signal according to described channel status; All cooperation points are different according to the subframe of the described channel status indication of the transmission reference signal that channel status indication reference signal configuration parameter is determined;
The first communication unit is used for sending described channel status indication reference signal in the subframe of determining, so that subscriber equipment is measured channel quality according to described channel status indication reference signal.
The technological means that provides is provided, main cooperation point determines to send the required channel status indication reference signal configuration parameter of CSI-RS, this channel status indication reference signal configuration parameter has specifically determined to send the concrete subframe of CSI-RS, main cooperation point and determine to send separately the subframe of CSI-RS from cooperation point according to channel status indication reference signal configuration parameter, all can be detected the channel quality of corresponding channel according to the CSI-RS from different cooperation points by UE, so that the MIMO technology no longer is confined to single residential quarter, but can process and coordination by multi-plot joint.
Also comprise in the cooperation point:
Switch unit is used for notifying described dispensing unit when as main cooperation point, produces described channel status indication reference signal configuration parameter by dispensing unit;
The second communication unit is used for described channel status indication reference signal configuration parameter is sent to from cooperation point.
The described subframe determining unit of cooperation point also comprises:
The first subframe unit when being used for described cooperation point as main cooperation point, determines that the described transmission cycle is P
A, and described transmission is biased to P
A-OffsetThe time, comprise that main cooperation point has M cooperation point, 1＜M＜16, described main cooperation point is floor (t in the subframe sequence number
f/ (MP
A))+P
A-OffsetDescending sub frame on send described channel status indication reference signal, wherein, t
fBe the original sequence number of subframe, since 0 counting, described floor () is lower rounding operation.
The second subframe unit is used for described cooperation point described during from cooperation point as m, is mP in the subframe sequence number
A+ floor (t
f/ (MP
A))+P
A-OffsetDescending sub frame on send described channel status indication reference signal, m is since 1 counting.
Main cooperation point also comprises:
The information retransmission unit is after being used for receiving described channel quality information, to send all or part of described channel quality information from cooperation point.
Also comprise in the subscriber equipment:
Measuring unit is used for the described CSI-RS that sends according to this cooperation point and can uses the CSI-RS set to generate described channel quality information; Wherein, when measuring aperiodic, before sending described CSI-RS, next cooperation point measures current cooperation point and the channel quality information between the described subscriber equipment.
And,
Feedback unit is used for described channel quality information feedback to main cooperation point; Wherein, when aperiodicity is fed back described channel quality information, before sending described CSI-RS, next cooperation point feeds back current cooperation point and the channel quality information between the described subscriber equipment.
The technological means that provides is provided, main cooperation point is determined to send the required transmission cycle of CSI-RS and is sent biasing, main cooperation point determines separately send the subframe of CSI-RS according to the transmission cycle with sending to setover from cooperation point with remaining, by subscriber equipment according to from the CSI-RS of different cooperation points with can use the CSI-RS set to carry out the measurement of channel quality information, and to main cooperation point feedback channel quality information, comprise that M cooperation point is to the PMI of subscriber equipment, RI or CQI, so that subscriber equipment can be realized the CoMP technology by CSI-RS, wherein, the CoMP technology makes the MIMO technology no longer be confined to single residential quarter, but can process and coordination by multi-plot joint.
The above is preferred implementation of the present invention; should be pointed out that for those skilled in the art, under the prerequisite that does not break away from principle of the present invention; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (12)
1. method of in Synergistic multi-point system, carrying out channel quality measurement, described Synergistic multi-point system comprises a plurality of cooperation points, it is characterized in that, method comprises:
Main cooperation point in a plurality of described cooperation points is determined channel status indication reference signal configuration parameter;
A plurality of described cooperation points are determined the subframe of transmitting channel state indication reference signal according to described channel status indication reference signal configuration parameter; All cooperation points are different according to the subframe of the described channel status indication of the transmission reference signal that channel status indication reference signal configuration parameter is determined;
All cooperation points send described channel status indication reference signal in the subframe of determining, so that subscriber equipment is measured channel quality according to described channel status indication reference signal.
2. method according to claim 1, it is characterized in that, described a plurality of cooperation point comprises main cooperation point and from cooperation point, described main cooperation point generates described channel status indication reference signal configuration parameter, and sends to described channel status indication reference signal configuration parameter described from cooperation point;
A plurality of described cooperation points determine that according to described channel status indication reference signal configuration parameter the subframe of transmitting channel state indication reference signal also comprises:
Described main cooperation point determines self to send subframe and the reference signal sequence of described channel status indication reference signal according to described channel status indication reference signal configuration parameter;
Described subframe and the reference signal sequence of determining self to send described channel status indication reference signal from the cooperation point basis from the described channel status indication reference signal configuration parameter of described main cooperation point.
3. method according to claim 2, it is characterized in that, the described reference signal sequence that sends the use of described channel status indication reference signal from cooperation point, the reference signal sequence that sends the use of described channel status indication reference signal with described main cooperation point is identical.
4. method according to claim 1 is characterized in that, described channel status indication reference signal configuration parameter comprises the transmission cycle and sends biasing;
Be P when the described transmission cycle of described main cooperation point
A, and described transmission is biased to P
A-OffsetThe time, comprise the total M of a main cooperation point cooperation point, 1＜M＜16, described main cooperation point is floor (t in the subframe sequence number
f/ (MP
A))+P
A-OffsetDescending sub frame on send described channel status indication reference signal, wherein, t
fBe the original sequence number of subframe, since 0 counting, described floor () is lower rounding operation;
M is mP from cooperation point in the subframe sequence number
A+ floor (t
f/ (MP
A))+P
A-OffsetDescending sub frame on send described channel status indication reference signal, m is since 1 counting.
5. method according to claim 4 is characterized in that, all cooperation points send described channel status indication reference signal in the subframe of determining and also comprise:
Within the continuous described transmission cycle, described main cooperation point is used different transmission antennas transmit described channel status indication reference signal from cooperation point at the identical resource location of different subframes with described; Described different transmitting antenna comprises transmitting antenna and each transmitting antenna from cooperation point of main cooperation point.
6. method according to claim 1 is characterized in that, subscriber equipment also comprises after according to described channel status indication reference signal channel quality being measured:
Described main cooperation point receives the described channel quality information of described subscriber equipment feedback; Wherein, for comprising main cooperation point and from each described cooperation point of cooperation point, the described channel status indication reference signal that described channel quality information is sent according to this cooperation point by described subscriber equipment and/or can use channel status indication sets of reference signals to generate.
7. method according to claim 6 is characterized in that, described main cooperation point receives the channel quality information of described subscriber equipment feedback in the following way:
Described main cooperation point periodicity or aperiodicity receive the channel quality information of described subscriber equipment feedback; Wherein, when aperiodicity receives described channel quality information, finished before next cooperation point sends described channel status indication reference signal by described subscriber equipment and to measure and feed back channel quality information between current cooperation point and the described subscriber equipment.
8. method according to claim 6 is characterized in that,
After described main cooperation point receives described channel quality information, to send all or part of described channel quality information from cooperation point.
According to claim 7 with 8 described either method, it is characterized in that, described channel quality information comprises: the indication of pre-coding matrix index, channel quality information and/or order indication.
10. the system that the channel quality of coordinate multipoint is measured is characterized in that, comprises a plurality of cooperation points, and wherein, a cooperation point comprises:
Dispensing unit is used for determining channel status indication reference signal configuration parameter;
The subframe determining unit is used for indicating the reference signal configuration parameter to determine the subframe of transmitting channel state indication reference signal according to described channel status; All cooperation points are different according to the subframe of the described channel status indication of the transmission reference signal that channel status indication reference signal configuration parameter is determined;
The first communication unit is used for sending described channel status indication reference signal in the subframe of determining, so that subscriber equipment is measured channel quality according to described channel status indication reference signal.
11. system according to claim 10 is characterized in that, cooperation point also comprises:
Switch unit is used for notifying described dispensing unit when described cooperation point during as main cooperation point, produces described channel status by dispensing unit and indicates the reference signal configuration parameter;
The second communication unit is used for described channel status indication reference signal configuration parameter is sent to from cooperation point.
12. system according to claim 10 is characterized in that, the described subframe determining unit of described cooperation point also comprises:
The first subframe unit when being used for described cooperation point as main cooperation point, determines that the described transmission cycle is P
A, and described transmission is biased to P
A-OffsetThe time, comprise that main cooperation point has M cooperation point, 1＜M＜16, described main cooperation point is floor (t in the subframe sequence number
f/ (MP
A))+P
A-OffsetDescending sub frame on send described channel status indication reference signal, wherein, t
fBe the original sequence number of subframe, since 0 counting, described floor () is lower rounding operation;
The second subframe unit is used for described cooperation point described during from cooperation point as m, is mP in the subframe sequence number
A+ floor (t
f/ (MP
A))+P
A-OffsetDescending sub frame on send described channel status indication reference signal, m is since 1 counting.
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| PCT/CN2011/084752 WO2012152037A1 (en) | 2011-06-30 | 2011-12-27 | Method and system for measuring channel quality in coordinated multi-point system |
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| Publication number | Publication date |
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| WO2012152037A1 (en) | 2012-11-15 |
| CN102857279B (en) | 2017-11-24 |
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