CN102857279B - A kind of method and system that channel quality measurement is carried out in Synergistic multi-point system - Google Patents
A kind of method and system that channel quality measurement is carried out in Synergistic multi-point system Download PDFInfo
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- CN102857279B CN102857279B CN201110182147.3A CN201110182147A CN102857279B CN 102857279 B CN102857279 B CN 102857279B CN 201110182147 A CN201110182147 A CN 201110182147A CN 102857279 B CN102857279 B CN 102857279B
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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 present invention provides a kind of method and system that channel quality measurement is carried out in Synergistic multi-point system, and Synergistic multi-point system includes multiple cooperation points, and method includes：Main cooperation point in multiple cooperation points determines that a channel status indicates reference signal configuration parameter；Multiple cooperation points indicate that reference signal configuration parameter determines to send the subframe of channel status instruction reference signal according to the channel status；All cooperation points indicate that the transmission channel status that reference signal configuration parameter determines indicates that the subframe of reference signal is different according to channel status；All cooperation points it is determined that subframe on send channel status instruction reference signal so that user equipment indicates that reference signal measures to channel quality according to the channel status.By the channel quality of user equipment channel according to corresponding to being detected the CSI RS from different cooperation points so that MIMO technology is no longer limited to single cell, but can be handled and be coordinated with multi-plot joint.
Description
Technical field
The present invention relates to wireless communication technology, it is a kind of in Synergistic multi-point system carry out channel quality measurement method and be
System.
Background technology
With the fast development of wireless communication technology, the frequency spectrum resource of wretched insufficiency is increasingly becoming restriction Development of Wireless Communications
Principal element, how to make full use of limited frequency spectrum resource, improve the important research direction that the availability of frequency spectrum is radio communication.
Multiple-input and multiple-output (Multiple Input Multiple Out, MIMO) technology can be without increase in bandwidth because of it
Improve efficiency of transmission and the availability of frequency spectrum and obtain extensive favor.MIMO technology make use of sky by transmitting diversity and reception diversity
Between diversity gain, antenna array gain make use of by beam forming (Beamforming) technology, pass through space multiplexing technique profit
With spatial multiplex gains.Wherein, the weak dependence of space diversity gain utilization space channel, and binding time/frequency are obtained
On selectivity, transmitting diversity provides more copies for the transmission of signal, and it is that have received transmission signal in space to receive diversity
Multiple copies, and then improve signal transmission reliability, so as to improve the signal to noise ratio of reception signal-such as space-frequency block codes
(Space Frequency Block Code)；The strong correlation of antenna array gain utilization space channel is obtained, passes through installation
Small spacing aerial array so that the electromagnetic wave transmitted in space produces interference so as to form the antenna pattern of highly directive, makes
The main lobe for obtaining antenna pattern adaptively points to arrival bearing user, so as to improve signal to noise ratio, improves power system capacity or covers
Lid scope-such as single current beam forming (Single Stream Beamforming)；It is utilization space to obtain spatial multiplex gains
The weak dependence of channel, different data flows is transmitted on multiple separate space channels, so as to improve data transfer
Peak rate-such as multi-user's multiple-input and multiple-output (Mutiple User MIMO, MU-MIMO) technology.Obviously, MIMO technology
Use depend critically upon characteristic and its measurement of space channel.
In Long Term Evolution version (LTE Release, Long Term Evolution Release) 8/9, in order to sky
Between the quality of channel measure and the data symbol of reception be demodulated, introduce public reference signal (CRS, Common
Reference Signal), user equipment (UE, User Equipment) can carry out the measurement of channel by CRS, be user
Equipment and base station selected different MIMO transmission pattern provide basic channel information, pass through in LTE Release 8/9
CRS realizes the measurement of terminal-pair channel, also achieves the demodulation that terminal-pair cell (Cell) sends data；The biography that can be supported
Defeated pattern includes diversity, open loop Single User MIMO (Single User MIMO, SU-MIMO), beam forming, closed loop single user
MIMO and closed loop MU-MIMO.
Inventor has found prior art, and there are the following problems：Be not based in the prior art coordinate multipoint (CoMP,
Coordinate Multiple Point), and realize that multiple cell joins by CSI-RS in the case of transparent to user equipment
Close processing and the concrete technical scheme coordinated.
The content of the invention
The technical problem to be solved in the present invention is to provide a kind of side that channel quality measurement is carried out in Synergistic multi-point system
Method and system, for solving in the prior art, be not based on coordinate multipoint realizes that multi-plot joint is handled by CSI-RS
The defects of with the particular technique of coordination.
Measured in order to solve the above technical problems, embodiments of the invention provide a kind of channel quality to coordinate multipoint
Method, method includes：Main cooperation point in multiple cooperation points determines that a channel status indicates reference signal configuration parameter；
Multiple cooperation points indicate that reference signal configuration parameter determines to send channel status instruction with reference to letter according to the channel status
Number subframe；All cooperation points indicate that the transmission channel status that reference signal configuration parameter determines indicates according to channel status
The subframe of reference signal is different；All cooperation points it is determined that subframe on send channel status instruction reference signal,
So that user equipment indicates that reference signal measures to channel quality according to the channel status.
In described method, the multiple cooperation point includes main cooperation point and generates institute from cooperation point, the main cooperation point
Channel status instruction reference signal configuration parameter is stated, and channel status instruction reference signal configuration parameter is sent to described
From cooperation point；Multiple cooperation points indicate that reference signal configuration parameter determines that sending channel status refers to according to the channel status
Showing the subframe of reference signal also includes：The main cooperation point indicates that reference signal configuration parameter determines certainly according to the channel status
Body sends the subframe and reference signal sequence of the channel status instruction reference signal；It is described from cooperation point according to coming from the master
The channel status instruction reference signal configuration parameter of cooperation point determines itself to send the channel status instruction reference signal
Subframe and reference signal sequence.
In described method, the reference signal sequence used from the cooperation point transmission channel status instruction reference signal
Row are identical with the reference signal sequence that the main cooperation point transmission channel status instruction reference signal uses.
In described method, the channel status instruction reference signal configuration parameter includes sending the cycle and sending biasing；
It is P when the transmission cycle of the main cooperation pointA, and the transmission is biased to PA-OffsetWhen, including main cooperation point altogether
There is M cooperation point, 1 ＜ M ＜ 16, the main cooperation point is in subframe serial number floor (tf/(M·PA))+PA-OffsetDescending son
The channel status instruction reference signal is sent on frame, wherein, tfFor the original sequence number of subframe, started counting up from 0, it is described
Floor () is lower rounding operation；M-th from cooperation point in subframe serial number mPA+floor(tf/(M·PA))+PA-Offset's
The channel status instruction reference signal is sent on descending sub frame, m starts counting up from 1.
In described method, all cooperation points it is determined that subframe on send channel status instruction reference signal and also wrap
Include：Within the continuous transmission cycle, the main cooperation point and it is described from cooperation point different subframes identical resource-niche
Put and launch the channel status instruction reference signal using different transmitting antennas；The different transmitting antenna includes main association
Make the transmitting antenna of point and each transmitting antenna from cooperation point.
In described method, user equipment indicates that reference signal measures it to channel quality according to the channel status
Also include afterwards：The main cooperation point receives the channel quality information of the user equipment feedback；Wherein, for including main association
Make point and from each described cooperation point including cooperation point, the channel quality information is by the user equipment according to the cooperation
The channel status instruction reference signal and/or the instruction sets of reference signals generation of usable channel status that point is sent.
In described method, the main cooperation point receives the channel quality letter of the user equipment feedback in the following way
Breath：The main cooperation point is periodically or aperiodicity receives the channel quality information of the user equipment feedback；Wherein, non-
Described in periodic receipt during channel quality information, send the channel status in next cooperation point by the user equipment and indicate
Complete to measure and feed back the channel quality information between current cooperation point and the user equipment before reference signal.
In described method, after the main cooperation point receives the channel quality information, sent all to from cooperation point
Or the part channel quality information.
In described method, the channel quality information includes：Pre-coding matrix index, channel quality information instruction and/
Or order instruction.
The system that a kind of channel quality to coordinate multipoint measures, including multiple cooperation points, wherein, a cooperation point
Including：Dispensing unit, for determining channel status instruction reference signal configuration parameter；Subframe determining unit, for according to institute
Channel status instruction reference signal configuration parameter is stated to determine to send the subframe of channel status instruction reference signal；All cooperation point roots
It is believed that each not phase of subframe for the transmission channel status instruction reference signal that road state instruction reference signal configuration parameter determines
Together；First communication unit, for it is determined that subframe on send channel status instruction reference signal so that user equipment root
Channel quality is measured according to channel status instruction reference signal.
In described system, cooperation point also includes：Switch unit, for when the cooperation point is as main cooperation point, leading to
Know the dispensing unit, producing the channel status by dispensing unit indicates reference signal configuration parameter；Second communication unit, use
It is sent in by channel status instruction reference signal configuration parameter from cooperation point.
In described system, the subframe determining unit of the cooperation point also includes：First subframe unit, for described
When cooperation point is as main cooperation point, determine that the transmission cycle is PA, and the transmission is biased to PA-OffsetWhen, including main cooperation
Point shares M cooperation point, and 1 ＜ M ＜ 16, the main cooperation point is in subframe serial number floor (tf/(M·PA))+PA-OffsetUnder
The channel status instruction reference signal is sent in row subframe, wherein, tfFor the original sequence number of subframe, started counting up from 0, it is described
Floor () is lower rounding operation；Second subframe unit, for the cooperation point as m-th Suo Shu from cooperation point when, in son
Frame number is mPA+floor(tf/(M·PA))+PA-OffsetDescending sub frame on send channel status instruction with reference to letter
Number, m starts counting up from 1.
The above-mentioned technical proposal of the present invention has the beneficial effect that：Main cooperation point determines to send the transmission week needed for CSI-RS
Phase biases the respective son for sending CSI-RS of determination with transmission biasing, main cooperation point and from cooperation point according to transmission cycle and transmission
Frame, channel quality is detected according to the CSI-RS from different cooperation points by UE, UE can realize down collaboration by CSI-RS
Multiple spot technology, wherein, CoMP technologies make MIMO technology be no longer limited to single cell, but can be handled and be assisted with multi-plot joint
Adjust.
Brief description of the drawings
Fig. 1 is the method flow schematic diagram that the embodiment of the present invention measures to the channel quality of coordinate multipoint；
Fig. 2 is that 2 cooperation points of the embodiment of the present invention send the network topology schematic diagram that channel status indicates reference signal；
Fig. 3 is that 2 cooperation points of the embodiment of the present invention determine subframe and send CSI-RS schematic diagram；
Fig. 4 is that 3 cooperation points of the embodiment of the present invention determine subframe and send CSI-RS schematic diagram；
Fig. 5 is that 2 cooperation points of the embodiment of the present invention determine subframe and send CSI-RS and receive feedback schematic diagram.
Embodiment
To make the technical problem to be solved in the present invention, technical scheme and advantage clearer, below in conjunction with accompanying drawing and tool
Body embodiment is described in detail.
Two kinds of new reference signals defined in LTE Release 10：Channel status instruction reference signal (CSI-RS,
Channel State Indication-Reference Signal) and demodulated reference signal (DMRS, Demodulation
Reference Signal), main purpose is the expense of further optimization channel measurement and improves channel measurement and demodulation
Flexibility ratio.Wherein, CSI-RS is exclusively used in the measurement of channel, by the measurement to CSI-RS can calculate UE need it is anti-to Cell
The pre-coding matrix index (PMI, Precoding Matrix Indicator) of feedback, channel quality information instruction (CQI,
Channel Quality Indicator) and order instruction (RI, Rank Indicator)；CSI-RS is in time domain and point of frequency domain
Cloth is all sparse, and to ensure only to include each day of serving cell in a resource block (RB, Resource Block)
One CSI-RS of line end mouth pilot density, and in time domain, it is desirable to CSI-RS cycle is used as using 5ms integral multiple.It is sparse
CSI-RS can support single Cell 8 antenna configurations, and advantageously support adjacent cell measurement configuration.
CSI-RS also has an advantage, is further to improve the average availability of frequency spectrum of cell, especially cell edge
The availability of frequency spectrum provides possibility, because CSI-RS provides possibility for the application of CoMP technologies, CoMP technologies make MIMO technology
Single cell is no longer limited to, but can handle and coordinate with multi-plot joint.CoMP technologies mainly include two kinds of forms：Joint hair
Penetrate (Joint Transmission, JT)：Data are by each cooperation point Combined Treatment, i.e., each UE data are by all associations
Make point joint transmitting, the quality of reception is improved to eliminate to disturb.Cooperative scheduling/cooperative beam figuration
(CoordinatedScheduling/Coordinated Beamforming, CS/CB)：Data are only launched from serving cell,
But UE is dispatched or BF modes are completed jointly by cooperation point.CoMP technologies need to know more channel quality informations, for example, connection
Closing lift-off technology requires each UE to its cooperation point feedback channel information, the precoding of cooperation point joint or Independent Decisiveness to the UE
Matrix or vector.In R8 and R9, because CRS is that cell is proprietary, CoMP technologies are impossible, but can in R10
To realize UE by CSI-RS by the coordination between Cell to the channel measurement of multiple cooperation points and feed back metrical information.
The embodiment of the present invention provides a kind of method that channel quality measurement is carried out in Synergistic multi-point system, and the cooperation is more
Dot system includes multiple cooperation points, as shown in figure 1, method includes：
Step 101, the main cooperation point in multiple cooperation points determines that a channel status indicates reference signal configuration parameter
(CSI-RS configuration parameters)；
Step 102, multiple cooperation points indicate that reference signal configuration parameter determines to send letter according to the channel status
The subframe of road state instruction reference signal；All cooperation points indicate the transmission of reference signal configuration parameter determination according to channel status
The subframe of the channel status instruction reference signal is different；
Step 103, all cooperation points it is determined that subframe on send channel status instruction reference signal so that user
Equipment indicates that reference signal measures to channel quality according to the channel status.
Using the technological means provided, main cooperation point determines to send the channel status instruction reference signal needed for CSI-RS
Configuration parameter, channel status instruction reference signal configuration parameter specifically determines the specific subframe that can send CSI-RS, main
Cooperation point and the subframe for indicating the respective transmission CSI-RS of reference signal configuration parameter determination according to channel status from cooperation point, by UE
The channel quality of channel corresponding to being detected according to the CSI-RS from different cooperation points so that MIMO technology no longer limits to
In single cell, but it can handle and coordinate with multi-plot joint.
In the embodiment of the present invention, when there is the appellation of all cooperation points, all cooperation points contain main cooperation point and
It is other from cooperation point；Multiple cooperation points are also to include main cooperation point and from cooperation point.
In a preferred embodiment, multiple cooperation points include main cooperation point and generated from cooperation point, the main cooperation point
The channel status indicates reference signal configuration parameter, and channel status instruction reference signal configuration parameter is sent into institute
State from cooperation point；Multiple cooperation points indicate that reference signal configuration parameter determines to send channel status according to the channel status
Indicating the subframe of reference signal also includes：The main cooperation point indicates that reference signal configuration parameter determines according to the channel status
Itself send the subframe of the channel status instruction reference signal；It is described from cooperation point according to from the main cooperation point
Channel status instruction reference signal configuration parameter determines itself to send the subframe of the channel status instruction reference signal.
Channel status instruction reference signal configuration parameter includes sending the cycle and sending biasing；When the hair of main cooperation point
It is P to send the cycleA, and the transmission is biased to PA-OffsetWhen, M cooperation point, 1 ＜ M ＜ 16, institute are shared including main cooperation point
Main cooperation point is stated in subframe serial number floor (tf/(M·PA))+PA-OffsetDescending sub frame on send the channel status and refer to
Show reference signal, wherein, tfFor the original sequence number of subframe, started counting up from 0, the floor () is lower rounding operation；M-th
From cooperation point in subframe serial number mPA+floor(tf/(M·PA))+PA-OffsetDescending sub frame on send the channel status
Reference signal is indicated, m starts counting up from 1.
So that main cooperation point and each sum from cooperation point are M as an example, when main cooperation point determines that it is P to send the cycleA, institute
It is P to state and send the concrete numerical value biasedA-OffsetWhen, in theory, a detection cycle is not more than 80 milliseconds, and main cooperation point is at one
In detection cycle, CSI-RS can be sent in any one subframe that one sent in the cycle.Clearly to inform that UE is a certain
Individual cooperation point can specifically send a CSI-RS in which subframe, it is therefore desirable to specifically determine one using biasing is sent
CSI-RS subframe can be sent, if PAValue collection be combined into [5,10,20,40,80], PA-OffsetValue be less than PAIt is specific
Numerical value, PAFor P corresponding to 5A-OffsetFor the integer between 0~4, P corresponding to 10A-OffsetFor the integer between 0~9,20 correspondences
PA-OffsetFor the integer between 0~19, P corresponding to 40A-OffsetFor the integer between 0~39, P corresponding to 80A-OffsetFor 0
Integer between~79, it is clear that send the concrete numerical value P of biasingA-OffsetSpan should cover the transmission being currently located
Each subframe in cycle.
The transmission cycle refers to：One cooperation point sends CSI-RS every time must select appropriate subframe, and can not arbitrarily select
A subframe is selected to load and send CSI-RS.Cooperation point is according to sending the cycle and sending the appropriate subframe of biasing selection, each
In detection cycle of the individual length no more than 80 milliseconds, M CSI-RS is sent by M cooperation point, that is, needs to cooperate for each
One appropriate subframe of point selection, therefore, it is necessary to be that each cooperation point determines that all can be that the cooperation point sends CSI-RS
Subframe, can be that the subframe that cooperation point sends CSI-RS be continuous in theory, number is more than one and has in other words
Limit, then first can be that the subframe that the cooperation point sends CSI-RS is the starting subframe in its transmission cycle, after starting subframe
Last can be the cooperation point send CSI-RS subframe be end subframe, send the cycle contain from starting subframe to
End subframe and all subframes between them.Then determine have in all subframes for being biased in and sending in the cycle according to sending
Body is used for the descending sub frame for sending CSI-RS.
In an application scenarios, M cooperation point, 1 ＜ M ＜ 16 are shared；M cooperation point both include main cooperation point and also including
From cooperation point：
Main cooperation point determines to send the transmission cycle needed for CSI-RS and sends biasing, sends the cycle and sends biasing composition
Channel status instruction reference signal configuration parameter；
Main cooperation point is individual after cooperation point issues channel status instruction reference signal configuration parameter to M-1 by RRC signaling,
M cooperation point indicates that reference signal configuration parameter sends CSI-RS in respective subframe to UE according to channel status, in this way, then
UE is every MPAIndividual subframe completes to measure a channel quality information of M cooperation point and feedback.
Each cooperation point indicates that reference signal configuration parameter is as follows to the CSI-RS progress that will be sent according to channel status
Configuration：
1, the transmission cycle of main cooperation point is PA, send and be biased to PA-Offset, therefore, according to the transmission formula of main cooperation point
floor(tf/(M·PA))+PA-OffsetM=1 is understood, main cooperation point sends the subframe sequence number of CSI-RS descending sub frame for the first time
For PA-Offset。
2, M-1 is individual from cooperation point, and m-th from cooperation point according to the transmission formula mP from cooperation pointA+floor(tf/
(M·PA))+PA-OffsetThe descending sub frame of determination sends CSI-RS, and its first time sends the subframe sequence of CSI-RS descending sub frame
Number it is PA+PA-Offset, m starts counting up from 1.
As shown in Fig. 2 in an application scenarios, the CSI-RS configurations and transmission of M=2 cooperation point, cooperation point are realized
Type be cell Cell, an evolved base station (evolved Node B, eNB) includes 3 Cell, association is taken in the present embodiment
It is combined into [Cell1, Cell2] as point set, wherein UE serving cell is Cell1；2 Cell realize UE pairs by configuring CSI-RS
The measurement of 2 Cell channel quality.
2 Cell send CSI-RS situation as shown in figure 3, and public using the transmission of main cooperation point in respective subframe
Formula floor (tf/(M·PA))+PA-Offset, and m-th from cooperation point according to the transmission formula mP from cooperation pointA+floor
(tf/(M·PA))+PA-Offset, step includes：
Step 201, Cell1 CSI-RS transmission period assignment is PA=5, Cell1 are according to floor (tf/(M·PA))+
PA-OffsetIdentified subframe sends CSI-RS 1.
Cell2 is according to mPA+floor(tf/(M·PA))+PA-OffsetIdentified subframe sends CSI-RS 2.
Step 202, specifically, P corresponding to 5A-OffsetFor the integer between 0~4, without loss of generality, P is takenA-Offset=
1, then main cooperation point Cell1 as shown in Figure 3 subframe 1 send a CSI-RS 1, from cooperation point Cell2 subframe 6 send one
Secondary CSI-RS 2.
Obvious Cell1 and Cell2 is in 2PACSI-RS of each transmitting task is completed in=10 subframes.
Step 203, in following 2PAIn=10 subframes, 2 cooperation points [Cell1, Cell2] will complete again
Launch CSI-RS task, i.e. Cell1 sends a CSI-RS 1 in subframe 11, and Cell2 sends a CSI- in subframe 16
RS 2。
In a preferred embodiment, user equipment indicates that reference signal is carried out to channel quality according to the channel status
Also include after measurement：Main cooperation point receives the channel quality information of the user equipment feedback；Wherein, for including master
Cooperation point and from each described cooperation point including cooperation point, channel quality information is by the user equipment according to the cooperation point
The channel status instruction reference signal sent and the instruction sets of reference signals generation of usable channel status, can specifically be adopted
The channel quality information is generated with channel estimation method.Wherein, when each cooperation point can measure the cooperation point to UE transmissions UE
CSI-RS set can be used；Channel quality information includes one of following or combination：Pre-coding matrix index (PMI,
PrecodingMatrix Indicator), channel quality information instruction (CQI, Channel Quality Indicator) and
Order instruction (RI, Rank Indicator).
In an application scenarios, as shown in Fig. 2 share M=2 cooperation point, the type of cooperation point is Cell, UE clothes
Business cell is Cell1, and cooperation point set is [Cell1, Cell2].Cell1 and Cell2 is located in same site, i.e. an eNB
Two interior cells.
Cell1 is in order to realize cooperation transmission with Cell2, it is necessary to Cell2 to UE channel quality information, such as RI, PMI
And CQI, therefore UE needs to measure CSI-RS2, now, UE serving cell Cell1 can configure Cell1 transmission cycle and transmission
Biasing, and notify Cell2 to send CSI-RS2 corresponding subframe according to sending the cycle and send biasing to calculate, UE according to
Cell1 channel status instruction reference signal configuration parameter, you can realize the survey to Cell1 and Cell2 channel quality information
Amount and feedback.
In an application scenarios, 2 Cell realize UE to 2 Cell channel quality information by configuring CSI-RS
Measurement.
Cell1 transmission period assignment is PA=5, Cell1 are according to floor (tf/(M·PA))+PA-OffsetIdentified son
Frame sends Cell1 CSI-RS 1, and Cell2 is according to mPA+floor(tf/(M·PA))+PA-OffsetIdentified subframe is sent
Cell2 CSI-RS 2.
P corresponding to 5A-OffsetFor the integer between 0~4, P is taken without loss of generality in the present embodimentA-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 in 2PAOne is respectively carried out to the channel quality of 2 cooperation points [Cell1, Cell2] in=10 subframes
Secondary measurement.
In following 2PAIn=10 subframes, UE will be carried out to the channel quality of 2 cooperation points [Cell1, Cell2]
Measure again, i.e. 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, realizing the configuration of M=3 cooperation point and sending CSI-RS, cooperation point
Type be Cell, UE serving cell is Cell1, its cooperate point set be [Cell1, Cell2, Cell3].
3 Cell send CSI-RS situation as shown in figure 4, to realize letters of the UE to 3 Cell in respective subframe
The measurement of road quality information, Cell1 CSI-RS transmission cycle are to be configured to PA=5, Cell1 are according to floor (tf/(M·
PA))+PA-OffsetIdentified subframe sends Cell1 CSI-RS 1, and Cell2 is according to mPA+floor(tf/(M·PA))+
PA-Offset, and subframe determined by m=1 sends Cell2 CSI-RS 2, Cell3 is according to mPA+floor(tf/(M·PA)),
And subframe determined by m=2 sends Cell3 CSI-RS3.Specifically include：
PAP corresponding to=5A-OffsetFor the integer between 0~4, without loss of generality, P is takenA-Offset=0, then Cell1 is in son
Frame 0 sends a CSI-RS 1, and Cell2 sends a CSI-RS 2 in subframe 5, and Cell3 sends a CSI-RS in subframe 10
3。
Obviously, UE is in 3PAThe channel quality of 3 cooperation points [Cell1, Cell2, Cell3] is believed in=15 subframes
Each measurement once of breath.
In following 3PAIn=15 subframes, 3 cooperation points [Cell1, Cell2, Cell3] launch another
CSI-RS, i.e. Cell1 send a CSI-RS 15 in subframe 15, and Cell2 sends a CSI-RS 2 in subframe 20, and Cell3 exists
Subframe 25 sends a CSI-RS 3.
In a preferred embodiment, the main cooperation point receives the channel of the user equipment feedback in the following way
Quality information：The main cooperation point is periodically or aperiodicity receives the channel quality information of the user equipment feedback；Its
In, when aperiodicity receives the channel quality information, the channel is sent in next cooperation point by the user equipment
Complete to measure and feed back the letter of the channel quality between current cooperation point and the user equipment before state instruction reference signal
Breath.In other words, UE can be to channel quality information described in the main cooperation point periodic feedback or non-periodic feedback；Wherein, in non-week
When phase measures, UE completes the survey to the channel quality information between cooperation point i and UE before cooperation point i+1 sends the CSI-RS
Amount and feedback.
After the main cooperation point receives the channel quality information, all or part of letter is sent to from cooperation point
Road quality information.
In an application scenarios, as shown in figure 5, the channel quality measurement of two cell cooperative multiple spots in station is realized, 2
Cell realizes measurements of the UE to 2 Cell channel quality information by configuring CSI-RS；In measurement process, UE is being received
Can in good time feedback channel quality information after the CSI-RS that each cooperation point is sent.
The transmission period assignment that main cooperation point Cell1 sends CSI-RS is PA=5, Cell1 are according to formula floor (tf/
(M·PA))+PA-OffsetThe subframe of determination sends CSI-RS 1, from cooperation point Cell2 according to mPA+floor(tf/(M·PA))
+PA-Offset, and the subframe of m=1 determinations sends Cell2 CSI-RS 2.
PAP corresponding to=5A-OffsetFor the integer between 0~4, without loss of generality, P is takenA-Offset=1, then Cell1 is in son
Frame 1 sends a CSI-RS 1, and Cell2 sends a CSI-RS 2 in subframe 6.
In following 2PAIn=10 subframes, UE will complete the CSI- again of 2 cooperation points [Cell1, Cell2]
RS transmitting, i.e. Cell1 send a CSI-RS 1 in subframe 11, and Cell2 sends a CSI-RS 2 in subframe 16.
Obviously, UE is in 2PATo each one-shot measurement of 2 cooperation points [Cell1, Cell2] in=10 subframes, wherein,
During first time measurement is carried out to the channel quality of two cooperation points, including：
After UE is connected to the CSI-RS 1 sent from Cell1 in subframe 1, by CSI-RS 1 and usable CSI-RS collection
Symphysis into channel quality information, and before subframe 11 by the channel quality information feedback to cooperation point, it is specifically chosen in son
Cooperation point is fed back on frame 3.
After UE is connected to the CSI-RS 2 sent from Cell2 in subframe 6, by CSI-RS 2 and usable CSI-RS collection
Symphysis into channel quality information, and before subframe 11 by the channel quality information feedback to cooperation point, it is specifically chosen in son
Cooperation point is fed back on frame 8.
During carrying out second measuring to the channel quality of two cooperation points, including：
After UE is connected to the CSI-RS 1 sent from Cell1 in subframe 11, by CSI-RS 1 and usable CSI-RS
Set generation channel quality information, and before subframe 16 by the channel quality information feedback to cooperation point, it is specifically chosen
Cooperation point is fed back in subframe 13.
After UE is connected to the CSI-RS 2 sent from Cell2 in subframe 16, by CSI-RS 2 and usable CSI-RS
Set generation channel quality information, and give the channel quality information feedback to main cooperation point Cell1 before subframe 21, specifically
Selection feeds back to cooperation point in subframe 18.
The embodiment of the present invention provides the system that a kind of channel quality to coordinate multipoint measures, including multiple cooperations
Point, wherein, a cooperation point includes：
Dispensing unit, for determining channel status instruction reference signal configuration parameter；
Subframe determining unit, for indicating that reference signal configuration parameter determines to send channel status according to the channel status
Indicate the subframe of reference signal；All cooperation points indicate the transmission letter of reference signal configuration parameter determination according to channel status
The subframe of road state instruction reference signal is different；
First communication unit, for it is determined that subframe on send channel status instruction reference signal so that user
Equipment indicates that reference signal measures to channel quality according to the channel status.
Using the technological means provided, main cooperation point determines to send the channel status instruction reference signal needed for CSI-RS
Configuration parameter, channel status instruction reference signal configuration parameter specifically determines the specific subframe that can send CSI-RS, main
Cooperation point and the subframe for indicating the respective transmission CSI-RS of reference signal configuration parameter determination according to channel status from cooperation point, by UE
The channel quality of channel corresponding to being detected according to the CSI-RS from different cooperation points so that MIMO technology no longer limits to
In single cell, but it can handle and coordinate with multi-plot joint.
Also include in cooperation point：
Switch unit, for as main cooperation point when, notify the dispensing unit, the channel produced by dispensing unit
State instruction reference signal configuration parameter；
Second communication unit, for channel status instruction reference signal configuration parameter to be sent to from cooperation point.
The subframe determining unit of cooperation point also includes：
First subframe unit, during for the cooperation point as main cooperation point, determine that the transmission cycle is PA, and it is described
Transmission is biased to PA-OffsetWhen, including the shared M cooperation point of main cooperation point, 1 ＜ M ＜ 16, the main cooperation point is in subframe sequence number
For floor (tf/(M·PA))+PA-OffsetDescending sub frame on send channel status instruction reference signal, wherein, tfFor son
The original sequence number of frame, is started counting up from 0, and the floor () is lower rounding operation.
Second subframe unit, for the cooperation point as m-th Suo Shu from cooperation point when, in subframe serial number mPA+
floor(tf/(M·PA))+PA-OffsetDescending sub frame on send channel status instruction reference signal, m counts since 1
Number.
Main cooperation point also includes：
Information retransmission unit, it is all or part of to being sent from cooperation point after receiving the channel quality information
The channel quality information.
Also include in user equipment：
Measuring unit, the letter is generated for the CSI-RS sent according to the cooperation point and usable CSI-RS set
Road quality information；Wherein, in aperiodic measurement, current cooperation is measured before next cooperation point sends the CSI-RS
Channel quality information between point and the user equipment.
And
Feedback unit, for giving the channel quality information feedback to main cooperation point；Wherein, described in aperiodicity feedback
During channel quality information, current cooperation point and the user equipment are fed back before next cooperation point sends the CSI-RS
Between channel quality information.
Using the technological means provided, main cooperation point determines to send the transmission cycle needed for CSI-RS and sent and biases,
Main cooperation point according to the transmission cycle and sends the respective subframe for sending CSI-RS of biasing determination with remaining from cooperation point, by user
Equipment carries out the measurement of channel quality information according to the CSI-RS from different cooperation points and usable CSI-RS set, and to master
Cooperation point feedback channel quality information, including M cooperation point is to PMI, RI or the CQI of user equipment so that user equipment can
CoMP technologies are realized by CSI-RS, wherein, CoMP technologies make MIMO technology be no longer limited to single cell, but can be how small
Area's Combined Treatment and coordination.
Described above is the preferred embodiment of the present invention, it is noted that for those skilled in the art
For, on the premise of principle of the present invention is not departed from, some improvements and modifications can also be made, these improvements and modifications
It should be regarded as protection scope of the present invention.
Claims (9)
1. a kind of method that channel quality measurement is carried out in Synergistic multi-point system, the Synergistic multi-point system include multiple cooperations
Point, it is characterised in that method includes：
Main cooperation point in multiple cooperation points determines that a channel status indicates reference signal configuration parameter, the channel status
Indicate that reference signal configuration parameter includes sending the cycle and sending biasing；It is P when the transmission cycle of the main cooperation pointA,
And the transmission is biased to PA-OffsetWhen, the shared M cooperation point including main cooperation point, 1<M<16, the main cooperation point exists
Subframe serial number floor (tf/(M·PA))+PA-OffsetDescending sub frame on send channel status instruction reference signal, its
In, tfFor the original sequence number of subframe, started counting up from 0, the floor () is lower rounding operation；
M-th from cooperation point in subframe serial number mPA+floor(tf/(M·PA))+PA-OffsetDescending sub frame on send institute
Channel status instruction reference signal is stated, m starts counting up from 1；
Multiple cooperation points indicate that reference signal configuration parameter determines to send channel status instruction ginseng according to the channel status
Examine the subframe of signal；All cooperation points indicate the transmission channel status of reference signal configuration parameter determination according to channel status
Indicate that the subframe of reference signal is different；
All cooperation points it is determined that subframe on send channel status instruction reference signal so that user equipment is according to
Channel status instruction reference signal measures to channel quality, including：Within the continuous transmission cycle, the main cooperation
Point uses the different transmitting antenna transmitting channel shapes from cooperation point with described on the identical resource location of different subframes
State indicates reference signal；The transmitting antenna of the different transmitting antenna including main cooperation point and each from the transmitting day of cooperation point
Line.
2. according to the method for claim 1, it is characterised in that the multiple cooperation point includes main cooperation point and from cooperation
Point, the main cooperation point generates the channel status instruction reference signal configuration parameter, and the channel status is indicated to refer to
Signal configuration parameter is sent to described from cooperation point；
Multiple cooperation points indicate that reference signal configuration parameter determines to send channel status instruction ginseng according to the channel status
Examining the subframe of signal also includes：
The main cooperation point indicates that reference signal configuration parameter determines that itself sends the channel status according to the channel status
Indicate the subframe and reference signal sequence of reference signal；
It is described to indicate that reference signal configuration parameter determines certainly according to the channel status from the main cooperation point from cooperation point
Body sends the subframe and reference signal sequence of the channel status instruction reference signal.
3. according to the method for claim 2, it is characterised in that described to send the channel status instruction reference from cooperation point
The reference signal sequence that signal uses, the reference used with the main cooperation point transmission channel status instruction reference signal are believed
Number sequence is identical.
4. according to the method for claim 1, it is characterised in that user equipment indicates reference signal according to the channel status
Also include after channel quality is measured：
The main cooperation point receives the channel quality information of the user equipment feedback；Wherein, for including main cooperation point
Sent out with from each described cooperation point including cooperation point, the channel quality information by the user equipment according to the cooperation point
The channel status instruction reference signal sent and/or the instruction sets of reference signals generation of usable channel status.
5. according to the method for claim 4, it is characterised in that the main cooperation point receives the user in the following way
The channel quality information of equipment feedback：
The main cooperation point is periodically or aperiodicity receives the channel quality information of the user equipment feedback；Wherein, exist
When aperiodicity receives the channel quality information, send the channel status in next cooperation point by the user equipment and refer to
Show and complete to measure and feed back the channel quality information between current cooperation point and the user equipment before reference signal.
6. according to the method for claim 4, it is characterised in that
After the main cooperation point receives the channel quality information, all or part of channel matter is sent to from cooperation point
Measure information.
7. according to the either method described in claim 5 and 6, it is characterised in that the channel quality information includes：Precoding square
Battle array index, channel quality information instruction and/or order instruction.
A kind of 8. system that channel quality to coordinate multipoint measures, it is characterised in that including multiple cooperation points, wherein,
One cooperation point includes：
Dispensing unit, for determining channel status instruction reference signal configuration parameter；
Subframe determining unit, for indicating that reference signal configuration parameter determines to send channel status instruction according to the channel status
The subframe of reference signal；All cooperation points indicate the transmission channel shape of reference signal configuration parameter determination according to channel status
The subframe of state instruction reference signal is different；Subframe determining unit also includes：
First subframe unit, during for the cooperation point as main cooperation point, determine that the transmission cycle is PA, and the transmission
It is biased to PA-OffsetWhen, including the shared M cooperation point of main cooperation point, 1<M<16, the main cooperation point is in subframe serial number floor
(tf/(M·PA))+PA-OffsetDescending sub frame on send channel status instruction reference signal, wherein, tfFor the original of subframe
Beginning sequence number, is started counting up from 0, and the floor () is lower rounding operation；
Second subframe unit, for the cooperation point as m-th from cooperation point when, in subframe serial number mPA+floor(tf/
(M·PA))+PA-OffsetDescending sub frame on send channel status instruction reference signal, m starts counting up from 1；
First communication unit, for it is determined that subframe on send channel status instruction reference signal so that user equipment
Indicate that reference signal measures to channel quality according to the channel status, including：Within the continuous transmission cycle, institute
State main cooperation point and it is described from cooperation point on the identical resource location of different subframes using different transmitting antenna transmitting institutes
State channel status instruction reference signal；The transmitting antenna of the different transmitting antenna including main cooperation point and each from cooperation point
Transmitting antenna.
9. system according to claim 8, it is characterised in that cooperation point also includes：
Switch unit, for when the cooperation point is as main cooperation point, notifying the dispensing unit, institute is produced by dispensing unit
State channel status instruction reference signal configuration parameter；
Second communication unit, for channel status instruction reference signal configuration parameter to be sent to from cooperation point.
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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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| CN104469960B (en) * | 2013-09-25 | 2019-12-10 | 中兴通讯股份有限公司 | scheduling configuration method and device |
| CN104811288B (en) * | 2014-01-29 | 2019-11-29 | 上海诺基亚贝尔股份有限公司 | The method for cooperateing with multicast communication |
| RU2673395C2 (en) * | 2014-04-10 | 2018-11-26 | Хуавэй Текнолоджиз Ко., Лтд. | Channel status information reporting method, user equipment and base station |
| CN105227272B (en) * | 2014-06-28 | 2019-08-09 | 上海朗帛通信技术有限公司 | A kind of large scale MIMO transmission method and device |
| CN110247747B (en) | 2015-01-30 | 2021-01-05 | 华为技术有限公司 | Method and device for transmitting feedback information in communication system |
| CN112165349A (en) * | 2016-03-31 | 2021-01-01 | 华为技术有限公司 | Channel state measuring method and device |
| CN108135005B (en) * | 2016-12-01 | 2022-07-12 | 罗德施瓦兹两合股份有限公司 | Measurement device and measurement method for composite MIMO measurement |
| KR102367080B1 (en) | 2017-06-23 | 2022-02-23 | 광동 오포 모바일 텔레커뮤니케이션즈 코포레이션 리미티드 | Wireless communication method and device |
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| CN101997633A (en) * | 2009-08-17 | 2011-03-30 | 中兴通讯股份有限公司 | Method and system for multiplexing channel measurement pilots from different cells |
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