CN106685498A - MIMO transmission method and device - Google Patents
MIMO transmission method and device Download PDFInfo
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- CN106685498A CN106685498A CN201510760901.5A CN201510760901A CN106685498A CN 106685498 A CN106685498 A CN 106685498A CN 201510760901 A CN201510760901 A CN 201510760901A CN 106685498 A CN106685498 A CN 106685498A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/0413—MIMO systems
- H04B7/0456—Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/0413—MIMO systems
- H04B7/0452—Multi-user MIMO systems
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/08—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/08—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station
- H04B7/0837—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station using pre-detection combining
- H04B7/0842—Weighted combining
- H04B7/0848—Joint weighting
- H04B7/0854—Joint weighting using error minimizing algorithms, e.g. minimum mean squared error [MMSE], "cross-correlation" or matrix inversion
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
- H04L25/03891—Spatial equalizers
- H04L25/03961—Spatial equalizers design criteria
- H04L25/03968—Spatial equalizers design criteria mean-square error [MSE]
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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
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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
- H04L5/0053—Allocation of signalling, i.e. of overhead other than pilot signals
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/20—Control channels or signalling for resource management
- H04W72/23—Control channels or signalling for resource management in the downlink direction of a wireless link, i.e. towards a terminal
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Abstract
The invention discloses an MIMO (Multiple Input Multiple Output) transmission method and device. In one embodiment, a UE receives K reference signals in K time windows and channel parameters of a current time window are estimated according to the K reference signals, wherein the K reference signals are unique to the UE; K is a positive integer; the current time window is the latest one among the K time windows; the time window is the basic regulation unit of time domain. By adopting the technical scheme provided by the invention, a problem of high cost in reference signal demodulation in MIMO technology is solved and user scheduling flexibility is kept as much as possible at the same time.
Description
Technical field
The present invention relates in mobile communication technology field reference signal design scheme, more particularly to employ the scheme of the downlink demodulation reference signal (DMRS-Demodulation Reference Signal) in the mobile communication system of extensive Multiinputoutput (Massive MIMO-Massive Multiple Input Multiple Output) technology.
Background technology
In traditional third generation cooperative partner program (3GPP -3rd Generation Partner Project) Long Term Evolution (LTE-Long Term Evolution) system, three kinds of downlink reference signals are defined：
● CRS (Cell specific Reference Signal, the specific reference signal of cell)
● URS (UE specific Reference Signal, the specific reference signals of UE)
● CSI-RS (CSI Reference Signal, channel status indicates reference signal)
Above-mentioned CRS and URS can be used for data and demodulate-belong to DMRS, and CSI-RS is used for channel monitoring.Accompanying drawing 8 is the CSI-RS patterns-while having indicated CRS and URS, one of lattice is the least resource unit-resource particle (RE-Resource Element) of LTE in an existing LTE cell based on normal cyclic prefix (Normal CP-Normal Cyclic Prefix).LTE system adopts the concept definition RS resources of port：One RS port is sent by an antenna port, and an antenna port may be mapped to a physical antenna, it is also possible to be to form a virtual antenna by antenna virtualization (merging superposition) by many physical antennas.For URS, RS ports are by { in patterns of the PRB to the RE of interior occupancy, OCC (Orthogonal Covering Code, orthogonal covering codes) } definition.The numeral identified in accompanying drawing 8 is RS port numbers (being sent by the antenna port of respective end slogan), i.e., RS ports 0～3 are CRS, and RS ports 7～10 are DMRS, and RS ports 15～22 are CSI-RS.Wherein URS and CSI-RS employ the orthogonal covering codes (OCC-Orthogonal Covering Code) that length is 2.
Used as a kind of new Cellular Networks antenna frame, Massive MIMO become a study hotspot recently.The typical feature of Massive mimo systems is that for example, power system capacity continues to increase in theory with the increase of antenna amount by increasing the quantity of antenna array unit to larger value so as to obtain a series of gains；The coherent superposition of transmitting antenna signal reduces transmission power etc..The typical application scenarios of Massive MIMO are to improve spectrum efficiency by increasing multi-user's quantity of space division multiplexing.The challenge that Massive MIMO are faced is that the expense of descending DMRS may be excessive.With LTE R (Release, version) as a example by 10, could support up 4 UE (User Equipment, user equipment) carry out multi-user transmission, each PRB (Physical Resource Block, Physical Resource Block) to being assigned with 24 RE as URS, account for the 14.3% of all available RE.
It is assumed that Massive MIMO using identical URS density (Density) and meanwhile support 20 UE carry out multi-user transmission, then DMRS accounts for the 71.4% of all available resources, the expense of control signaling is considered further that, being left the RE of little ratio is used for data transfer, greatly reduces efficiency of transmission.
The present invention discloses a solution for this problem.It should be noted that in the case where not conflicting, the feature in embodiment and embodiment in the UE (User Equipment, user equipment) of the application may apply in base station, and vice versa.Further, in the case where not conflicting, the feature in embodiments herein and embodiment can arbitrarily be mutually combined.
The content of the invention
In traditional MU (Multiple User, multi-user)-MIMO, the precoding vector for giving UE generally is affected to reduce inter-user interference by matching UE.Typical Dynamic Scheduling Strategy is the UE for flexibly selecting mutually to match in different scheduling time windows, i.e. UE pairings are typically unfixed in different scheduling time windows.Therefore, the precoding vector of UE is unfixed in different scheduling time windows, i.e. UE can not utilize the URS of multiple scheduling time windows to carry out channel estimation.
Inventor has found that, with the increase of antenna amount, the randomization feature of the channel between different UE becomes apparent from by studying.For (antenna amount is enough) Massive MIMO, the precoding vector for giving UE also can preferably avoid inter-user interference using the criterion of MRT (Maximum Ratio Transmission, high specific sends).Precoding vector i.e. for given UE is possible to no longer be affected by pairing UE.
According to above-mentioned analysis, the invention discloses a kind of method supported in the UE of the channel estimation of time window, wherein, comprise the steps：
- step A. receives respectively K reference signal in K time window, and according to the K reference signal channel parameter of current time window is estimated.
Wherein, the K reference signal is UE specific, and the K is positive integer, and current time window is newest in the K time window one, and the time window is the basic thread of time domain.
The essence of said method is that UE performs joint channel estimation to the reference signal in multiple threads.It is low speed mobile context in view of typical MU-MIMO application scenarios, the interpolation of time domain can significantly improve channel estimating performance.Because the precoding vector in Massive MIMO is affected less by pairing UE, said method will not significantly affect the motility of user scheduling.
Used as one embodiment, the UE is specifically referred to：The dispatch of the K reference signal is all UE specific (not being cell common signaling).
Used as one embodiment, the UE is specifically referred to：The configuration parameter of the K reference signal is UE specific, and the configuration parameter includes at least one of { RS port indexs, RS port numbers, (some or all of) generation parameter of RS sequences, shared frequency band, OCC }.
Used as one embodiment, the K time window is continuous.
Used as one embodiment, the K time window is discrete.
Used as one embodiment, the UE obtains the channel parameter of current time window using the channel estimation method of Wiener filter.
Used as one embodiment, a time window is a LTE subframe.
Used as one embodiment, a time window is a LTE time slot (0.5 millisecond, it is adaptable to short TTI scheduling just under discussion).
Used as one embodiment, a time window is less than 1 millisecond.
Used as one embodiment, time window applies to a ultrashort subframe in high carrier frequency (more than 6GHz) wireless communication system.Used as one embodiment, the persistent period of the ultrashort subframe is 0.2 millisecond.
Used as one embodiment, the channel parameter is the CIR (Channel Impulse Response, channel impulse response) of wireless channel.
Used as one embodiment, each shared frequency band of the K reference signal is identical.The present embodiment can ensure that the UE obtains superior channel estimating performance, however cost be cause certain scheduling limit-i.e. described UE takes identical frequency band in K time window.But in view of in Massive MIMO scenes, the maximum number of user that MU-MIMO can be supported is a larger numeral, above-mentioned scheduling limits the motility for being not significantly affected by resource allocation.
Used as one embodiment, the frequency band in the K reference signal shared by least two reference signals is incomplete same.The present embodiment may reduce channel estimating performance (due to the error that frequency domain interpolation is brought) and cause the complexity of channel estimation to rise, but the present embodiment does not cause scheduling to limit.
Used as one embodiment, at least part of frequency band in target band is related (correlation bandwidth is determined by the maximum multipath time delay of wireless channel) on frequency domain at least part of frequency band in present band.The target band is the frequency band in the K reference signal shared by any one reference signal, and the present band is the frequency band shared by the reference signal in current time window.
Used as one embodiment, the K is more than 1.
Specifically, according to an aspect of the present invention, it is characterised in that also comprise the steps：
- step B. carries out channel equalization according to the channel parameter of the current time window to the downstream signal received in current time window.
Used as one embodiment, the channel equalization adopts MMSE (Minimum Mean Square Error, least mean-square error) criterion.
Specifically, according to an aspect of the present invention, it is characterised in that step A also comprises the steps：
- step A0. receives the first signaling, and the first signaling indicates observation cycle, and the observation cycle includes M continuous time window.
Wherein, the K time window belongs to same observation cycle.
Used as one embodiment, the UE assumes that the reference signal in an observation cycle is sent by identical (one or more) antenna port.
Used as one embodiment, the first signaling is high-level signaling.
Used as one embodiment of above-mentioned aspect, the K is equal to 1.
Specifically, according to an aspect of the present invention, it is characterised in that the RS sequences of the reference signal are that time window is specific.
Used as one embodiment, the initial value for giving the RS sequences of reference signal is relevant with the index of the time window shared by given reference signal.Used as a sub- embodiment, the index of shared time window is index of the shared time window in observation cycle.Used as another sub- embodiment, the time window is LTE subframes, and the index of shared time window is index of the shared time window in LTE radio frames.
As one embodiment,, respectively including the 2m element and the 2m+1 element of pseudo-random sequence, the generation parameter of the initial value of the pseudo-random sequence includes the index of the time window shared by given reference signal for the real part of m-th element of the RS sequences of given reference signal and the generation parameter of imaginary part.
Specifically, according to an aspect of the present invention, it is characterized in that, the UE voluntarily selects the K time window from object time window set, object time window set by an observation cycle in all object time windows constitute, the object time window refers to that the UE is scheduled and carries out the time window of downlink reception.
In above-mentioned aspect, UE can voluntarily select the K time window according to the correlation time (Coherent Time) of such as current radio channel and correlation bandwidth from object time window set, rather than be forced, using the object time window in all object time window set, to reduce the complexity of channel estimation.
Used as one embodiment, only when UE detects dispatch, the descending RS in corresponding time window is only possible to be used for the channel estimation of current time window.The benefit of the present embodiment is that the descending RS for target UE is sent in each time window that base station is not used in an observation cycle.
Used as one embodiment, the UE receives K DCI (Downl ink Control Information, Downlink Control Information), and the K DCI dispatches respectively the downlink data transmission in the K time window.
Specifically, according to an aspect of the present invention, it is characterized in that, the reference signal includes L RS port, the index at least including at least one of two reference signals, one of reference signal RS ports in the K reference signal is the value outside the index of L RS port of another reference signal.
As one embodiment, the defined parameters of the RS ports include { in a basic resource blocks shared RE, OCC indexes on same subcarrier, RS sequences } at least the above two, the basic resource blocks take a time window in time domain, and the basic thread of a frequency domain is taken on frequency domain.Used as one embodiment, basic resource blocks are a PRB (Physical Resource Block, Physical Resource Block) to (Pair).
Used as one embodiment, the index of the RS ports is nonnegative integer.
Used as one embodiment, the span of the index of the RS ports in all time windows is identical.
Specifically, according to an aspect of the present invention, it is characterised in that the K reference signal is sent by L antenna port, L RS port in each reference signal is sent respectively according to default sortord by the L antenna port.
The benefit of above-mentioned aspect be for base station side scheduling provide maximum motility.Base station need not be L fixed RS port of the UE distribution in K time window, and only guarantee that each reference signal includes L RS port.
Used as one embodiment, L RS port in each reference signal is sorted according to the size of RS port indexs, and respectively by L antenna port transmission.
The invention discloses a kind of method in base station for supporting extensive MIMO, wherein, comprise the steps：
- step A. sends respectively K reference signal in K time window.The K reference signal can be used to estimate the channel parameter of current time window by UE.
Wherein, the K reference signal is UE specific, and the K is positive integer, and current time window is newest in the K time window one, and the time window is the basic thread of time domain.
Specifically, according to an aspect of the present invention, it is characterised in that step A also comprises the steps：
- step A0. sends the first signaling, and the first signaling indicates observation cycle, and the observation cycle includes M continuous time window.
Wherein, the K time window belongs to same observation cycle.
Specifically, according to an aspect of the present invention, it is characterised in that the RS sequences of the reference signal are that time window is specific.
Specifically, according to an aspect of the present invention, it is characterized in that, the reference signal includes L RS port, the index at least including at least one of two reference signals, one of reference signal RS ports in the K reference signal is the value outside the index of L RS port of another reference signal.
Used as one embodiment, the time window is LTE subframes, and the RS ports reuse a URS port to interior pattern in PRB to interior pattern in PRB.
Specifically, according to an aspect of the present invention, it is characterised in that the K reference signal is sent by L antenna port, L RS port in each reference signal is sent respectively according to default sortord by the L antenna port.
Used as one embodiment, the antenna port is generated by the method for antenna virtualization by many physical antennas.
The invention discloses a kind of user equipment for supporting the channel estimation across time window, it is characterised in that the equipment includes：
First module：For receiving K reference signal respectively in K time window, the channel parameter of current time window is estimated according to the K reference signal
Second module：For carrying out channel equalization to the downstream signal received in current time window according to the channel parameter of the current time window.
Wherein, the K reference signal is UE specific, and the K is positive integer, and current time window is newest in the K time window one, and the time window is the basic thread of time domain.The K reference signal is sent by L antenna port, and L RS port in each reference signal is sent respectively according to default sortord by the L antenna port.
Used as one embodiment, above-mentioned user equipment is characterised by, the first module is additionally operable to receive the first signaling, and the first signaling indicates observation cycle, and the observation cycle includes M continuous time window.Wherein, the K time window belongs to same observation cycle.
The invention discloses a kind of base station equipment for supporting extensive MIMO, it is characterised in that the equipment includes：
First module：For sending K reference signal respectively in K time window.
Wherein, the K reference signal is UE specific, and the K is positive integer, and current time window is newest in the K time window one, and the time window is the basic thread of time domain.The K reference signal is sent by L antenna port, and L RS port in each reference signal is sent respectively according to default sortord by the L antenna port.
Used as one embodiment, above-mentioned base station equipment is characterised by, the first module is additionally operable to send the first signaling, and the first signaling indicates observation cycle, and the observation cycle includes M continuous time window.Wherein, the K time window belongs to same observation cycle.
Compare with traditional scheme, the present invention possesses following advantage：
-. on the premise of RS density is not increased, improve channel estimating performance；Or on the premise of same channel estimates performance, reduce RS density
-. user scheduling motility is maintained as far as possible.
Description of the drawings
By reading the detailed description made to non-limiting example made with reference to the following drawings, the other features, objects and advantages of the present invention will become more apparent：
Fig. 1 shows that K reference signal of utilization according to an embodiment of the invention performs the flow chart of channel estimation；
Fig. 2 shows that occupied bandwidth of the reference signal according to an embodiment of the invention in time windows there occurs the schematic diagram of change；
Fig. 3 shows RS ports according to an embodiment of the invention to the schematic diagram of antenna terminal mapping；
Fig. 4 shows the schematic diagram that density of the reference signal according to an embodiment of the invention in time windows is consistent；
Fig. 5 shows the schematic diagram that density of the reference signal according to an embodiment of the invention in time windows changes；
Fig. 6 shows the structured flowchart of the processing meanss in UE according to an embodiment of the invention；
Fig. 7 shows the structured flowchart of the processing meanss in base station according to an embodiment of the invention；
Fig. 8 shows the schematic diagram of the descending RS of a PRB centering in LTE system, wherein digital respective antenna port index；
Specific embodiment
Technical scheme is described in further detail below in conjunction with accompanying drawing, it should be noted that in the case where not conflicting, the feature in embodiments herein and embodiment can arbitrarily be mutually combined.
Embodiment 1
Embodiment 1 illustrates the flow chart that channel estimation is performed using K reference signal, as shown in Figure 1.In accompanying drawing 1, base station N1 is the maintenance base station of the Serving cell of UE U2.In accompanying drawing 1, the step in square frame F1 and square frame F2 is respectively optional step.
For base station N1, the first signaling is sent in step S101, the first signaling indicates observation cycle, and the observation cycle includes M continuous time window.Send K reference signal respectively in K time window in step s 102.
For UE U2, the first signaling is received in step s 201.K reference signal is received respectively in K time window in step S202, and the channel parameter of current time window is estimated according to the K reference signal.Channel parameter according to the current time window in step S203 carries out channel equalization to the downstream signal received in current time window.
In embodiment 1, the K reference signal is UE specific, and the K is positive integer, and current time window is newest in the K time window one, and the time window is the basic thread of time domain.The K time window belongs to same observation cycle.
Used as the sub- embodiment 1 of embodiment 1, the first signaling is RRC (Radio Resource Control, wireless heterogeneous networks) layer signaling.
Used as the sub- embodiment 2 of embodiment 1, in step S202, the UE voluntarily selects the K time window from object time window set, object time window set by an observation cycle in all object time windows constitute.The object time window refers to that the UE is scheduled and carries out the time window of downlink reception, i.e., it is based on the specific reference signals of UE that described UE can detect downlink signaling-downlink reception that downlink reception is carried out in the object time window for scheduling.It is described voluntarily to select to meet following two standards：
-. at least part of frequency band in target band is related on frequency domain at least part of frequency band in present band.The target band is the frequency band in the K reference signal shared by any one reference signal, and the present band is the frequency band shared by the reference signal in current time window.
-. any one time window in the K time window is related (correlation time is generally determined by the translational speed of UE) in time domain to current time window.
As the sub- embodiment 3 of embodiment 1, the K reference signal is respectively by K DCI (Downlink Control Information, Downlink Control Information) scheduled in, the K DCI also dispatches respectively the downlink data transmission in the K time window.
Embodiment 2
Embodiment 2 illustrates the schematic diagram that occupied bandwidth of the reference signal in time windows there occurs change, as shown in Figure 2.In accompanying drawing 2, the grid of oblique line mark is the time/frequency source block shared by a reference signal.
In embodiment 2, the K time window in the present invention includes very first time window, the second time window and current time window, i.e., described K is 3.The K reference signal in present invention bandwidth shared at least two time windows in the K time window there occurs change.
In embodiment 2, the K time window belongs to the cycle at the same time, and a time cycle includes the continuous time window of positive integer.Multiple time cycles are continuous in time domain and circulate appearance (till being updated by downlink signaling).
The advantage of embodiment 2 is the motility for providing maximum for system call, i.e., do not limit the K reference signal and take identical bandwidth.Embodiment 2 may increase UE sides for processing the complexity of the module of channel estimation, but UE can pass through to realize that related method (such as the reference signal on selected section frequency band) controls complexity in acceptable degree.
Embodiment 3
Embodiment 3 illustrates RS ports to the schematic diagram of antenna terminal mapping, as shown in Figure 3.
In embodiment 3, UE receives respectively K reference signal in K time window, and according to the K reference signal channel parameter of current time window is estimated.The reference signal includes L RS port, and the L is 4.The K reference signal includes the first reference signal and the second reference signal.First reference signal is transmitted in very first time window, and the index of L RS port of the first reference signal is respectively { n_1, n_2, n_3, n_4 }；Second reference signal is transmitted in the second time window, and the index of L RS port of the second reference signal is respectively { n_1, n_3, n_4, n_7 }.Wherein, n_1, n_2, n_3, n_4, n_7 are respectively integers.The index value of the RS ports n_2 in the first reference signal is the value outside the index of L RS port of the second reference signal.
In embodiment 3, the K reference signal is respectively by identical L antenna port (i.e. antenna port # { 1,2,3,4 }) send, L RS port in each reference signal is sent respectively according to default sortord (not needing signal deployment) by the L antenna port.For the first reference signal, RS ports { n_1, n_2, n_3, n_4 } is sent respectively by antenna port # { 1,2,3,4 }；For the second reference signal, RS ports { n_1, n_3, n_4, n_7 } is sent respectively by antenna port # { 1,2,3,4 }.
Used as the sub- embodiment 1, n_1 of embodiment 3, n_2, n_3, n_4, n_7 are the integer sequence for increasing successively, i.e. n_1<n_2<n_3<n_4<n_7.
As the sub- embodiment 2, n_1 of embodiment 3>n_2>n_3>n_4>N_7 is the integer sequence being sequentially reduced.
As the sub- embodiment 3 of embodiment 3, the specific RS ports of 16 UE are accommodated up in a time window, corresponding 16 indexes are：{ n_1, n_2, n_3, n_4, n_5, n_6, n_7, n_8, n_9, n_10, n_11, n_12, n_13, n_14, n_15, n_16 }.
Embodiment 4
Embodiment 4 illustrates the schematic diagram that density of the reference signal in time windows is consistent, as shown in Figure 4.In accompanying drawing 4, the grid of oblique line mark is the RE (Resource Element, resource particle) that the first reference signal takes, and the grid of backslash mark is the RE that the second reference signal takes.
In embodiment 4, the K reference signal in the present invention includes the first reference signal and the second reference signal, and the time window in the present invention is LTE subframes.First reference signal is transmitted in a LTE subframes, and the second reference signal is transmitted in the 2nd LTE subframes.PRB (Physical Resource Block, Physical Resource Block) #v1 is one in the shared PRB on frequency domain of the first reference signal, and PRB#v2 is in the shared PRB on frequency domain of the second reference signal.PRB is respectively integer in the index v1 and v2 of frequency domain.
In accompanying drawing 4, the index of OFDM (Orthogonal Frequency Division Multiplexing, the OFDM) symbol of a PRB centering is 0,1 ..., 13；The index of subcarrier is 0,1 ..., 11.
Used as the sub- embodiment 1 of embodiment 4, PRB is to using general cyclic prefix (Normal cyclic prefix), the K reference signal is sent by FDD (Frequency Division Duplex, FDD) cell.The modulation symbol (Modulation Symbols) of complex values of the RS ports p of given reference signal in { subcarrier k, OFDM symbol l } of PRB pairIt is by reference signal sequence rt_wM () maps as follows：
Wherein
K=5m'+12nPRB+1
L=l'mod2+5
M'=0,1,2
It is the maximum PRB numbers in system bandwidth, nsIt is index of the LTE time slots in LTE radio frames, nPRBIt is the frequency domain index of PRB, i.e., for PRB is to #v1：nPRB=v1；For PRB is to #v2：nPRB=v2.OCC sequencesWith reference to the form 6.10.3.2-1 of 3GPP standards TS36.211.
RS sequences rt_wM () is that time window is related, t_w is index of the time window in observation cycle, i.e., for PRB is to #v1：T_w is index of the LTE subframes in observation cycle；For PRB is to #v2：T_w is index of the 2nd LTE subframes in observation cycle.
As the sub- embodiment 2 of embodiment 4,
Pseudo-random sequence c (i) is saved with reference to the 6.10.3.1 of TS36.211.
It is a UE as the target receiver of the sub- embodiment 3 of embodiment 4, the first reference signal and the second reference signal.On the RE shared by the second reference signal, base station sends the 3rd reference signal for the 2nd UE, the OCC of the second reference signal and the 3rd reference signal is identical, and the second reference signal is pseudo-orthogonal (i.e. the initial value of the maker of pseudo-random sequence is different) with the RS sequences of the 3rd reference signal.In the sub- embodiment, a UE can carry out channel estimation to the wireless channel in the 2nd LTE subframes using the first reference signal and the second reference signal, reduce the interference of the 3rd reference signal.The capacity of reference signal is increased, while channel estimating performance will not be significantly reduced.
Embodiment 5
Embodiment 5 illustrates the schematic diagram that density of the reference signal in time windows changes, as shown in Figure 5.In accompanying drawing 5, the grid of oblique line mark is the RE that the first reference signal takes, and the grid of backslash mark is the RE that the second reference signal takes.
In embodiment 5, the K reference signal in the present invention includes the first reference signal and the second reference signal, and the time window in the present invention is LTE subframes.First reference signal is transmitted in a LTE subframes, and the second reference signal is transmitted in the 2nd LTE subframes.PRB#v1 is in the shared PRB on frequency domain of the first reference signal, and PRB#v2 is in the shared PRB on frequency domain of the second reference signal.PRB is respectively integer in the index v1 and v2 of frequency domain.
In embodiment 5, at least two reference signals are different to interior density in a PRB in the K reference signal.
As shown in Figure 5, density of first reference signal in PRB#v1 is more than density of second reference signal in PRB#v2.Although the density of the reference signal in PRB#v2 is relatively low, but UE can carry out channel estimation according to the first reference signal and the second reference signal to the wireless channel in the 2nd LTE subframes, on the premise of reference signal expense (Overhead) is reduced channel estimating performance is ensure that.
Embodiment 6
Embodiment 6 is for the structured flowchart of the processing meanss in UE, as shown in Figure 6.In accompanying drawing 4, UE devices 200 are made up of the first module 201 and the second module 202.
First module 201 is used to receive K reference signal respectively in K time window, and according to the K reference signal channel parameter of current time window is estimated.Second module 202 is used to carry out channel equalization to the downstream signal received in current time window according to the channel parameter of the current time window.
In embodiment 6, the K reference signal is UE specific, and the K is greater than 1 positive integer, and current time window is newest in the K time window one, and the time window is the basic thread of time domain.The K reference signal is sent by L antenna port, and L RS port in each reference signal is sent respectively according to default sortord by the L antenna port.
Used as the sub- embodiment 1 of embodiment 6, the first module is additionally operable to receive the first signaling, and the first signaling indicates observation cycle, and the observation cycle includes M continuous time window.Wherein, the K time window belongs to same observation cycle.First signaling is high-level signaling.
As the sub- embodiment 2 of embodiment 6, the reference signal includes L RS port, at least include the first reference signal and the second reference signal in the K reference signal, the index of at least one RS ports is the value outside the index of L RS port of the second reference signal in the first reference signal.The L is positive integer.The K reference signal is sent by L antenna port, and L RS port in each reference signal is sent respectively according to default sortord by the L antenna port.
Used as the sub- embodiment 3 of embodiment 6, the time window is LTE subframes, and the RS ports reuse LTE URS ports in PRB to interior shared pattern in PRB to interior shared RE patterns.The URS ports are in RS ports { 7,8,9,10,11,12,13,14 }.
Embodiment 7
Embodiment 7 is for the structured flowchart of the processing meanss in base station, as shown in Figure 7.In accompanying drawing 7, base station apparatus 300 are made up of the first module 301.
First module 301 is used to send the first signaling and sends K reference signal respectively in K time window.
In embodiment 7, the K reference signal is UE specific, and the K is positive integer, and current time window is (occurring at the latest) newest in the K time window, and the time window is the basic thread of time domain.The K reference signal is sent by L antenna port, and L RS port in each reference signal is sent respectively according to default sortord by the L antenna port.First signaling indicates observation cycle, and the observation cycle includes M continuous time window.Wherein, the K time window belongs to same observation cycle.
Used as the sub- embodiment 1 of embodiment 7, the K is 1.
Used as the sub- embodiment 2 of embodiment 7, the first signaling indicates the length of the time window in the observation cycle.The initial time window of the observation cycle is default configuration.
Used as the sub- embodiment 3 of embodiment 7, the time window is LTE subframes, and the RS ports reuse a LTE URS port in PRB to interior shared pattern in PRB to interior shared RE patterns.
One of ordinary skill in the art will appreciate that all or part of step in said method can instruct related hardware to complete by program, described program can be stored in computer-readable recording medium, such as read only memory, hard disk or CD etc..Optionally, all or part of step of above-described embodiment can also be realized using one or more integrated circuit.Accordingly, each modular unit in above-described embodiment, can be realized using example, in hardware, it is also possible to realize that the application is not limited to the combination of the software and hardware of any particular form by the form of software function module.UE in the present invention includes but is not limited to the Wireless Telecom Equipments such as mobile phone, panel computer, notebook, card of surfing Internet.Base station in the present invention includes but is not limited to the Wireless Telecom Equipments such as macrocell base stations, microcell base station, Home eNodeB, relay base station.
The above, only presently preferred embodiments of the present invention is not intended to limit protection scope of the present invention.All any modifications within the spirit and principles in the present invention, made, equivalent, improve etc., should be included within the scope of the present invention.
Claims (16)
1. a kind of method supported in the UE of the channel estimation of time window, wherein, including it is as follows
Step：
- step A. receives respectively K reference signal in K time window, according to described K ginseng
Examine the channel parameter of Signal estimation current time window.
Wherein, the K reference signal is UE specific, and the K is positive integer, when current
Between window be newest in the K time window one, the time window is the basic scheduling of time domain
Unit.
2. method according to claim 1, it is characterised in that also comprise the steps：
- step B. is according to the channel parameter of the current time window to receiving in current time window
Downstream signal carries out channel equalization.
3. method according to claim 1, it is characterised in that step A also includes
Following steps：
- step A0. receives the first signaling, and the first signaling indicates observation cycle, the observation cycle
Including M continuous time window.
Wherein, the K time window belongs to same observation cycle.
4. method according to claim 1, it is characterised in that the RS of the reference signal
Sequence is that time window is specific.
5. method according to claim 3, it is characterised in that the UE is from the object time
The K time window is voluntarily selected in window set, the object time window set is by an observation
In cycle all object time windows composition, the object time window refer to the UE be scheduled into
The time window of row downlink reception.
6. the method according to claim 1-5, it is characterised in that the reference signal bag
L RS port is included, two reference signals is at least included in the K reference signal, wherein one
The index of at least one of individual reference signal RS ports is L RS end of another reference signal
Value outside the index of mouth.
7. the method according to claim 1, described in 6, it is characterised in that described K with reference to letter
Number sent by L antenna port, L RS port in each reference signal is according to default row
Sequential mode is sent respectively by the L antenna port.
8. a kind of method in base station for supporting extensive MIMO, wherein, comprise the steps：
- step A. sends respectively K reference signal in K time window.Described K with reference to letter
Number can be used to estimate the channel parameter of current time window by UE.
Wherein, the K reference signal is UE specific, and the K is positive integer, when current
Between window be newest in the K time window one, the time window is the basic scheduling of time domain
Unit.
9. method according to claim 8, it is characterised in that step A also includes
Following steps：
- step A0. sends the first signaling, and the first signaling indicates observation cycle, the observation cycle
Including M continuous time window.
Wherein, the K time window belongs to same observation cycle.
10. method according to claim 8, it is characterised in that the RS of the reference signal
Sequence is that time window is specific.
11. methods according to claim 8-10, it is characterised in that the reference signal
Including L RS port, two reference signals are at least included in the K reference signal, wherein
The index of at least one of one reference signal RS ports is L RS of another reference signal
Value outside the index of port.
12. according to claim 8, the method described in 11, it is characterised in that the K reference
Signal is sent by L antenna port, and L RS port in each reference signal is according to default
Sortord is sent respectively by the L antenna port.
13. a kind of user equipmenies for supporting the channel estimation across time window, it is characterised in that this sets
It is standby to include：
First module：For receiving K reference signal respectively in K time window, according to described
K reference signal estimates the channel parameter of current time window
Second module：For according to the channel parameter of the current time window to connecing in current time window
The downstream signal of receipts carries out channel equalization.
Wherein, the K reference signal is UE specific, and the K is positive integer, when current
Between window be newest in the K time window one, the time window is the basic scheduling of time domain
Unit.The K reference signal is sent by L antenna port, the L in each reference signal
RS ports are sent respectively according to default sortord by the L antenna port.
14. equipment according to claim 13, it is characterised in that the first module is additionally operable to
The first signaling is received, the first signaling indicates observation cycle, and the observation cycle includes M continuously
Time window.Wherein, the K time window belongs to same observation cycle.
15. a kind of base station equipments for supporting extensive MIMO, it is characterised in that the equipment includes：
First module：For sending K reference signal respectively in K time window.
Wherein, the K reference signal is UE specific, and the K is positive integer, when current
Between window be newest in the K time window one, the time window is the basic scheduling of time domain
Unit.The K reference signal is sent by L antenna port, the L in each reference signal
RS ports are sent respectively according to default sortord by the L antenna port.
16. base station equipments according to claim 15, it is characterised in that the first module is also
For sending the first signaling, the first signaling indicates observation cycle, and the observation cycle connects including M
Continuous time window.Wherein, the K time window belongs to same observation cycle.
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| CN201510760901.5A CN106685498A (en) | 2015-11-10 | 2015-11-10 | MIMO transmission method and device |
| PCT/CN2016/105266 WO2017080472A1 (en) | 2015-11-10 | 2016-11-10 | Mimo transmission method and device |
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| CN201510760901.5A CN106685498A (en) | 2015-11-10 | 2015-11-10 | MIMO transmission method and device |
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| CN113497700B (en) * | 2017-09-27 | 2022-03-29 | 上海朗帛通信技术有限公司 | A kind of user equipment used for wireless communication, method and apparatus in base station |
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