WO2017080472A1 - 一种mimo传输方法和装置 - Google Patents

一种mimo传输方法和装置 Download PDF

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Publication number
WO2017080472A1
WO2017080472A1 PCT/CN2016/105266 CN2016105266W WO2017080472A1 WO 2017080472 A1 WO2017080472 A1 WO 2017080472A1 CN 2016105266 W CN2016105266 W CN 2016105266W WO 2017080472 A1 WO2017080472 A1 WO 2017080472A1
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reference signals
time window
time windows
reference signal
ports
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French (fr)
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张晓博
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Shanghai Langbo Communication Technology Co Ltd
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Shanghai Langbo Communication Technology Co Ltd
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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
    • 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
    • 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
    • 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
    • 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
    • H04L25/0202—Channel estimation
    • H04L25/0224—Channel estimation using sounding signals
    • 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
    • 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]
    • 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
    • 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
    • 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

Definitions

  • the present invention relates to a scheme for designing a reference signal in the field of mobile communication technologies, and in particular to a downlink demodulation reference signal (DMRS-Demodulation) in a mobile communication system using a Massive MIMO-Massive Multiple Input Multiple Output (MIMO) technology. Reference Signal) scheme.
  • DMRS-Demodulation downlink demodulation reference signal
  • MIMO Massive MIMO-Massive Multiple Input Multiple Output
  • the above CRS and URS can be used for data demodulation - that is, DMRS, and CSI-RS is used for channel monitoring.
  • 8 is a CSI-RS pattern based on a normal cyclic prefix (Normal CP-Normal Cyclic Prefix) in an existing LTE cell - simultaneously indicating CRS and URS, wherein one small square is the smallest resource unit of LTE - resource particle (RE-Resource Element).
  • the LTE system uses the concept of a port to define RS resources: one RS port is sent by one antenna port, one antenna port may be mapped to one physical antenna, or it may be formed by multiple physical antennas through antenna virtualization (ie, merged superposition). Virtual antenna.
  • the RS port is defined by ⁇ the pattern of the RE occupied in the PRB pair, OCC (Orthogonal Covering Code) ⁇ .
  • the number identified in Figure 8 is the RS port number (sent by the antenna port of the corresponding port number), ie the RS port 0 to 3 are CRS, RS ports 7 to 10 are DMRS, and RS ports 15 to 22 are CSI-RS.
  • the URS and CSI-RS use an OCC-Orthogonal Covering Code of length 2.
  • Massive MIMO has recently become a research hotspot.
  • a typical feature of a Massive MIMO system is to obtain a series of gains by increasing the number of antenna array elements to a larger value.
  • the system capacity theoretically increases with the number of antennas; the coherent superposition of the transmit antenna signals reduces the transmit power. and many more.
  • a typical application scenario for Massive MIMO is to increase spectral efficiency by increasing the number of multi-users for space division multiplexing.
  • One of the challenges faced by Massive MIMO is that the overhead of downstream DMRS may be too large.
  • LTE R Release, version 10
  • UEs User Equipment
  • Each PRB Physical Resource Block
  • DMRS Downlink Reference Signal
  • the precoding vector for a given UE is usually affected by the paired UE to reduce inter-user interference.
  • a typical dynamic scheduling policy is to flexibly select mutually paired UEs in different scheduling time windows, that is, UE pairing is usually not fixed in different scheduling time windows. Therefore, the precoding vector of the UE is not fixed in different scheduling time windows, that is, the UE cannot utilize the URS of multiple scheduling time windows for channel estimation.
  • Massive MIMO the number of antennas is sufficient
  • MRT Maximum Ratio Transmission
  • the present application discloses a method in a UE supporting channel estimation across a time window, which includes the following steps:
  • Step A Receive K reference signals in K time windows, and estimate channel parameters of the current time window based on the K reference signals.
  • the K reference signals are UE-specific, the K is a positive integer, and the current time window is the latest one of the K time windows, and the time window is a basic scheduling unit of the time domain.
  • the essence of the above method is that the UE performs joint channel estimation on reference signals in multiple scheduling units.
  • time domain interpolation can significantly improve channel estimation performance. Since the precoding vector in Massive MIMO is less affected by the paired UE, the above method does not significantly affect the flexibility of user scheduling.
  • the UE-specific means that the scheduling signaling of the K reference signals is UE-specific (ie, not cell common signaling).
  • the UE-specific means that the configuration parameters of the K reference signals are UE-specific, and the configuration parameters include ⁇ RS port index, number of RS ports, and (partial or total) generation of RS sequences. At least one of the parameter, the occupied frequency band, OCC ⁇ .
  • the K time windows are continuous.
  • the K time windows are discrete.
  • the UE uses a channel estimation algorithm of the Wiener filter to obtain channel parameters of the current time window.
  • one of the time windows is an LTE subframe.
  • one of the time windows is an LTE time slot (0.5 milliseconds, suitable for short TTI scheduling in question).
  • one of the time windows does not exceed 1 millisecond.
  • one of the time windows is an ultra-short subframe suitable for use in a high carrier frequency (greater than 6 GHz) wireless communication system.
  • the duration of the ultra short subframe is 0.2. millisecond.
  • the channel parameter is a CIR (Channel Impulse Response) of a wireless channel.
  • the frequency bands occupied by the K reference signals are the same. This embodiment can ensure that the UE obtains superior channel estimation performance, but at the cost of causing certain scheduling constraints - that is, the UE occupies the same frequency band in K time windows.
  • certain scheduling constraints - that is, the UE occupies the same frequency band in K time windows.
  • the maximum number of users that MU-MIMO can support is a large number. The above scheduling constraints do not significantly affect the flexibility of resource allocation.
  • the frequency bands occupied by at least two of the K reference signals are not identical. This embodiment may reduce channel estimation performance (due to errors caused by frequency domain interpolation) and cause an increase in channel estimation complexity, however, this embodiment does not cause scheduling restrictions.
  • the frequency bands in the target frequency band and at least a portion of the current frequency bands are correlated in the frequency domain (the associated bandwidth is determined by the maximum multipath delay of the wireless channel).
  • the target frequency band is a frequency band occupied by any one of the K reference signals
  • the current frequency band is a frequency band occupied by a reference signal in a current time window.
  • the K is greater than one.
  • the method further includes the following steps:
  • Step B Perform channel equalization on the downlink signals received in the current time window according to the channel parameters of the current time window.
  • the channel equalization adopts an MMSE (Minimum Mean Square Error) criterion.
  • the step A further includes the following steps:
  • Step A0 Receive first signaling, the first signaling indicating an observation period, the observation period comprising M consecutive time windows.
  • the K time windows belong to the same observation period.
  • the UE assumes that reference signals within one observation period are transmitted by the same antenna port(s).
  • the first signaling is higher layer signaling.
  • the K is equal to one.
  • the RS sequence of the reference signal is time window specific.
  • the initial value of the RS sequence of a given reference signal is related to the index of the time window occupied by the given reference signal.
  • the index of the occupied time window is the index of the occupied time window in the observation period.
  • the time window is an LTE subframe
  • an index of the occupied time window is an index of the occupied time window in the LTE radio frame.
  • the generation parameters of the real and imaginary parts of the mth element of the RS sequence of the given reference signal respectively include the 2mth element and the 2m+1th element of the pseudo-random sequence, the pseudo-random sequence
  • the generation parameters of the initial value include an index of the time window occupied by the given reference signal.
  • the target time window set is composed of all target time windows in one observation period
  • the target time window refers to a time window in which the UE is scheduled to perform downlink reception.
  • the UE can select the K time windows from the target time window set according to a Coherent Time such as the current wireless channel and the associated bandwidth, instead of being forced to utilize the target time in all the target time window sets.
  • the window reduces the complexity of channel estimation.
  • the downlink RS in the corresponding time window may be used for the channel estimation of the current time window.
  • An advantage of this embodiment is that the base station does not need to transmit the downlink RS for the target UE in each time window in one observation period.
  • the UE receives K DCIs (Downlink Control Information), and the K DCIs respectively schedule downlink data transmission in the K time windows.
  • K DCIs Downlink Control Information
  • the reference signal includes L RS ports, and at least two reference signals are included in the K reference signals, wherein an index of at least one RS port of one reference signal is another A value other than the index of the L RS ports of the reference signal.
  • the definition parameters of the RS port include at least two of an RE occupied in one basic resource block, an OCC index on the same subcarrier, and an RS sequence.
  • the basic resource block occupies a time window in the time domain and occupies a basic scheduling unit of the frequency domain in the frequency domain.
  • a basic resource block is a PRB (Physical Resource Block) pair (Pair).
  • the index of the RS port is a non-negative integer.
  • the value range of the index of the RS port in all time windows is the same.
  • the K reference signals are sent by L antenna ports
  • L RS ports in each reference signal are respectively sent by the L antenna ports in a default ordering manner.
  • the benefit of the above aspects is to provide maximum flexibility for scheduling at the base station side.
  • the base station does not need to allocate a fixed number of L RS ports to the UE in K time windows, but only ensures that each reference signal includes L RS ports.
  • the L RS ports in each reference signal are sorted according to the size of the RS port index, and are respectively sent by the L antenna ports.
  • the present application discloses a method in a base station supporting massive MIMO, which includes the following steps:
  • Step A Send K reference signals in K time windows.
  • the K reference signals can be used by the UE to estimate channel parameters for the current time window.
  • the K reference signals are UE-specific, the K is a positive integer, and the current time window is the latest one of the K time windows, and the time window is a basic scheduling unit of the time domain.
  • the step A further includes the following steps:
  • Step A0 Sending first signaling, the first signaling indicating an observation period, the observation period comprising M consecutive time windows.
  • the K time windows belong to the same observation period.
  • the RS sequence of the reference signal is time window specific.
  • the reference signal includes L RS ports, and at least two reference signals are included in the K reference signals, wherein an index of at least one RS port of one reference signal is another A value other than the index of the L RS ports of the reference signal.
  • the time window is an LTE subframe
  • the RS port reuses a pattern of a URS port within a PRB pair in a pattern within the PRB pair.
  • the K reference signals are sent by L antenna ports
  • L RS ports in each reference signal are respectively sent by the L antenna ports in a default ordering manner.
  • the antenna port is generated by a method in which a plurality of physical antennas are virtualized by an antenna.
  • the present application discloses a user equipment supporting channel estimation across a time window, where the apparatus includes:
  • a first module configured to respectively receive K reference signals in K time windows, and estimate channel parameters of a current time window according to the K reference signals
  • the second module is configured to perform channel equalization on the downlink signal received in the current time window according to the channel parameter of the current time window.
  • the K reference signals are UE-specific, the K is a positive integer, and the current time window is the latest one of the K time windows, and the time window is a basic scheduling unit of the time domain.
  • the K reference signals are sent by L antenna ports, and the L RS ports in each reference signal are respectively sent by the L antenna ports in a default ordering manner.
  • the foregoing user equipment is characterized in that the first module is further configured to receive the first signaling, the first signaling indicates an observation period, and the observation period includes M consecutive time windows. Wherein, the K time windows belong to the same observation period.
  • the present application discloses a base station device supporting massive MIMO, wherein the device includes:
  • the first module is configured to separately transmit K reference signals in K time windows.
  • the K reference signals are UE-specific, the K is a positive integer, and the current time window is the latest one of the K time windows, and the time window is a basic scheduling unit of the time domain.
  • the K reference signals are sent by L antenna ports, and the L RS ports in each reference signal are respectively sent by the L antenna ports in a default ordering manner.
  • the foregoing base station device is characterized in that the first module is further configured to send the first signaling, where the first signaling indicates an observation period, and the observation period includes M consecutive time windows. Wherein, the K time windows belong to the same observation period.
  • FIG. 1 shows a flow chart for performing channel estimation using K reference signals in accordance with one embodiment of the present application
  • FIG. 2 is a schematic diagram showing changes in occupied bandwidth of reference signals in different time windows according to an embodiment of the present application
  • FIG. 3 shows a schematic diagram of an RS port to antenna port mapping in accordance with an embodiment of the present application
  • FIG. 4 is a schematic diagram showing the consistency of density of reference signals in different time windows in accordance with one embodiment of the present application
  • FIG. 5 is a diagram showing changes in density of reference signals in different time windows according to an embodiment of the present application.
  • FIG. 6 shows a structural block for a processing device in a UE according to an embodiment of the present application.
  • FIG. 7 is a block diagram showing the structure of a processing device used in a base station according to an embodiment of the present application.
  • FIG. 8 shows a schematic diagram of a downlink RS in one PRB pair in an LTE system, where the number corresponds to an antenna port index.
  • Embodiment 1 exemplifies a flowchart for performing channel estimation using K reference signals, as shown in FIG.
  • a base station N1 is a maintenance base station of a serving cell of UE U2.
  • the steps in block F1 and block F2 are optional steps, respectively.
  • the first signaling is sent in step S101, the first signaling indicating an observation period, the observation period including M consecutive time windows.
  • K reference signals are respectively transmitted in K time windows in step S102.
  • the first signaling is received in step S201.
  • K reference signals are respectively received in K time windows, and channel parameters of the current time window are estimated according to the K reference signals.
  • Channel equalization is performed on the downlink signal received in the current time window according to the channel parameter of the current time window in step S203.
  • the K reference signals are UE-specific, the K is a positive integer, and the current time window is the latest one of the K time windows, and the time window is a basic scheduling unit of the time domain.
  • the K time windows belong to the same observation period.
  • the first signaling is RRC (Radio Resource Control) layer signaling.
  • the UE selects the K time windows from the target time window set, and the target time window set is in an observation period. All target time windows are composed.
  • the target time window is a time window in which the UE is scheduled to perform downlink reception, that is, the UE can detect downlink signaling for scheduling downlink reception in the target time window - the downlink reception is based on UE specific reference signal.
  • the self-selection satisfies the following two criteria:
  • the target frequency band is a frequency band occupied by any one of the K reference signals
  • the current frequency band is a frequency band occupied by a reference signal in a current time window
  • any one of the K time windows and the current time window are related in the time domain (the correlation time is usually determined by the moving speed of the UE).
  • the K reference signals are respectively scheduled by K DCI (Downlink Control Information), and the K DCIs are also respectively scheduled in the K time windows. Downstream data transmission.
  • K DCI Downlink Control Information
  • Embodiment 2 illustrates a schematic diagram in which the occupied bandwidth of the reference signal changes in different time windows, as shown in FIG. In Fig. 2, the square marked by the diagonal line is a time-frequency resource block occupied by a reference signal.
  • the K time windows in the present application include a first time window, a second time window and a current time window, that is, the K is 3.
  • the K reference signals in the present application vary in the bandwidth occupied by at least two of the K time windows.
  • the K time windows belong to the same time period, and one time period includes a positive integer number of consecutive time windows. Multiple time periods are continuous in the time domain and occur cyclically (until updated by downstream signaling).
  • Embodiment 2 provides maximum flexibility for system scheduling, that is, does not limit the K reference signals occupying the same bandwidth.
  • Embodiment 2 may increase the complexity of the module for processing channel estimation on the UE side, however the UE can control the complexity to an acceptable level by implementing a related approach, such as selecting a reference signal on a partial frequency band.
  • Embodiment 3 illustrates a schematic diagram of RS port to antenna port mapping, as shown in FIG.
  • the UE respectively receives K reference signals in K time windows, and estimates channel parameters of the current time window according to the K reference signals.
  • the reference signal includes L RS ports, and the L is 4.
  • the K reference signals include a first reference signal and a second reference signal.
  • the first reference signal is transmitted in the first time window, the indexes of the L RS ports of the first reference signal are respectively ⁇ n_1, n_2, n_3, n_4 ⁇ ;
  • the second reference signal is transmitted in the second time window, the second reference
  • the indexes of the L RS ports of the signal are ⁇ n_1, n_3, n_4, n_7 ⁇ , respectively.
  • n_1, n_2, n_3, n_4, and n_7 are integers, respectively.
  • the index value of the RS port n_2 in the first reference signal is a value other than the index of the L RS ports of the second reference signal.
  • the K reference signals are respectively transmitted by the same L antenna ports (ie, antenna ports # ⁇ 1, 2, 3, 4 ⁇ ), and the L RS ports in each reference signal are defaulted.
  • the sorting mode ie, no signaling configuration is required
  • the RS ports ⁇ n_1, n_2, n_3, n_4 ⁇ are respectively transmitted by the antenna port # ⁇ 1, 2, 3, 4 ⁇ ;
  • the RS port ⁇ n_1, n_3, n_4, n_7 ⁇ They are sent by antenna port # ⁇ 1, 2, 3, 4 ⁇ respectively.
  • n_1, n_2, n_3, n_4, and n_7 are sequentially increasing integer sequences, that is, n_1 ⁇ n_2 ⁇ n_3 ⁇ n_4 ⁇ n_7.
  • n_1>n_2>n_3>n_4>n_7 is a sequence of integers which are sequentially decreased.
  • a maximum of 16 UE-specific RS ports are accommodated in one time window, and the 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 illustrates a schematic diagram in which the density of reference signals remains uniform in different time windows, as shown in FIG.
  • the square indicated by the oblique line is the RE (Resource Element) occupied by the first reference signal
  • the square marked by the back oblique line is the RE occupied by the second reference signal.
  • the K reference signals in the present application include a first reference signal and a second reference
  • the time window in this application is an LTE subframe.
  • the first reference signal is transmitted in the first LTE subframe
  • the second reference signal is transmitted in the second LTE subframe.
  • the PRB (Physical Resource Block) #v1 is one of the PRBs occupied by the first reference signal in the frequency domain
  • the PRB#v2 is one of the PRBs occupied by the second reference signal in the frequency domain.
  • the index v1 and v2 of the PRB in the frequency domain are integers, respectively.
  • the index of the OFDM (Orthogonal Frequency Division Multiplexing) symbol in one PRB pair is 0, 1, ..., 13; the index of the subcarrier is 0, 1, ..., 11.
  • the PRB pair adopts a normal cyclic prefix, and the K reference signals are transmitted by an FDD (Frequency Division Duplex) cell.
  • FDD Frequency Division Duplex
  • n s is the index of the LTE slot in the LTE radio frame
  • OCC sequence Refer to Table 6.10.3.2-1 of the 3GPP standard TS 36.211.
  • the RS sequence r t_w (m) is time window dependent, and t_w is the index of the time window in the observation period, that is, the PRB pair #v1:t_w is the index of the first LTE subframe in the observation period; for the PRB pair #v2 :t_w is the index of the second LTE subframe in the observation period.
  • the pseudo-random sequence c(i) refers to section 6.10.3.1 of TS 36.211.
  • the target recipient of the first reference signal and the second reference signal is the first UE.
  • the base station On the RE occupied by the second reference signal, the base station sends a third reference signal for the second UE, the OCC of the second reference signal and the third reference signal are the same, and the RS sequence of the second reference signal and the third reference signal It is pseudo-orthogonal (ie, the initial values of the generators of the pseudo-random sequence are different).
  • the first UE can perform channel estimation on the wireless channel in the second LTE subframe by using the first reference signal and the second reference signal, and reduce interference of the third reference signal.
  • the capacity of the reference signal is increased without significantly reducing the channel estimation performance.
  • Embodiment 5 exemplifies a change in density of reference signals in different time windows, as shown in FIG.
  • the square marked by the oblique line is the RE occupied by the first reference signal
  • the square marked by the back oblique line is the RE occupied by the second reference signal.
  • the K reference signals in the present application include a first reference signal and a second reference signal
  • the time window in the present application is an LTE subframe.
  • the first reference signal is transmitted in the first LTE subframe
  • the second reference signal is transmitted in the second LTE subframe.
  • PRB#v1 is one of the PRBs occupied by the first reference signal in the frequency domain
  • PRB#v2 is one of the PRBs occupied by the second reference signal in the frequency domain.
  • the index v1 and v2 of the PRB in the frequency domain are integers, respectively.
  • At least two of the K reference signals have different densities in one PRB pair.
  • the density of the first reference signal in PRB #v1 is greater than the density of the second reference signal in PRB #v2.
  • the density of the reference signal in the PRB#v2 is low, the UE can perform channel estimation on the radio channel in the second LTE subframe according to the first reference signal and the second reference signal, and the premise of reducing the reference signal overhead (Overhead) The channel estimation performance is guaranteed.
  • Embodiment 6 is a structural block diagram of a processing device for use in a UE, as shown in FIG.
  • the UE device 200 is composed of a first module 201 and a second module 202.
  • the first module 201 is configured to respectively receive K reference signals in K time windows, and estimate channel parameters of the current time window according to the K reference signals.
  • the second module 202 is configured to perform channel equalization on the downlink signal received in the current time window according to the channel parameter of the current time window.
  • the K reference signals are UE-specific, the K is a positive integer greater than 1, and the current time window is the latest one of the K time windows, and the time window is a basic of the time domain.
  • the K reference signals are sent by L antenna ports, and the L RS ports in each reference signal are respectively sent by the L antenna ports in a default ordering manner.
  • the first module is further configured to receive the first signaling, where the first signaling indicates an observation period, where the observation period includes M consecutive time windows. Wherein, the K time windows belong to the same observation period.
  • the first signaling is high layer signaling.
  • the reference signal includes L RS ports
  • the K reference signals include at least a first reference signal and a second reference signal, and an index of at least one RS port in the first reference signal Is a value other than the index of the L RS ports of the second reference signal.
  • the L is a positive integer.
  • the K reference signals are sent by L antenna ports, and the L RS ports in each reference signal are respectively sent by the L antenna ports in a default ordering manner.
  • the time window is an LTE subframe
  • the RE pattern occupied by the RS port in the PRB pair reuses a pattern occupied by the LTE URS port in the PRB pair.
  • the URS port is one of the RS ports ⁇ 7, 8, 9, 10, 11, 12, 13, 14 ⁇ .
  • Embodiment 7 is a structural block diagram of a processing device used in a base station, as shown in FIG.
  • the base station apparatus 300 is composed of a first module 301.
  • the first module 301 is configured to send the first signaling and separately send K reference signals in the K time windows.
  • the K reference signals are UE-specific, the K is a positive integer, and the current time window is the latest one of the K time windows (ie, the latest occurs), and the time window is a time domain.
  • the K reference signals are sent by L antenna ports, and the L RS ports in each reference signal are respectively sent by the L antenna ports in a default ordering manner.
  • the first signaling indicates an observation period including M consecutive time windows. Wherein, the K time windows belong to the same observation period.
  • the K is 1.
  • the first signaling indicates the length of the time window in the observation period.
  • the start time window of the observation period is configured by default.
  • the time window is an LTE subframe
  • the RE pattern occupied by the RS port in the PRB pair reuses a pattern occupied by one LTE URS port in the PRB pair.
  • each module unit in the above embodiment may be implemented in hardware form or in the form of a software function module.
  • the application is not limited to any specific combination of software and hardware.
  • the UE in the present application includes, but is not limited to, a wireless communication device such as a mobile phone, a tablet computer, a notebook, and an internet card.
  • the base station in the present application includes, but is not limited to, a macro communication base station, a micro cell base station, a home base station, a relay base station, and the like.

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Abstract

本申请提出了一种MIMO传输方法和装置。在一个实施例中，UE在K个时间窗中分别接收K个参考信号，根据所述K个参考信号估计当前时间窗的信道参数。其中，所述K个参考信号是UE特定的，所述K是正整数，当前时间窗是所述K个时间窗中最新的一个，所述时间窗是时间域的基本调度单位。通过使用本申请中提供的技术方案，解决了大规模MIMO中解调参考信号开销过高的问题，同时尽可能的保持了用户调度灵活性。

Description

一种MIMO传输方法和装置
交叉引用
本申请引用于2015年11月10日递交的名称为“一种MIMO传输方法和装置”的第201510760901.5号中国专利申请，其通过引用被全部并入本申请。
技术领域
本申请涉及移动通信技术领域中参考信号设计的方案，特别是涉及采用了大规模多输入输出(Massive MIMO-Massive Multiple Input Multiple Output)技术的移动通信系统中的下行解调参考信号(DMRS-Demodulation Reference Signal)的方案。
背景技术
传统的第三代合作伙伴项目(3GPP–3rd Generation Partner Project)长期演进(LTE-Long Term Evolution)系统中，定义了三种下行参考信号：
●CRS(Cell specific Reference Signal，小区特定的参考信号)
●URS(UE specific Reference Signal，UE特定的参考信号)
●CSI-RS(CSI Reference Signal，信道状态指示参考信号)
上述CRS和URS能用于数据解调–即属于DMRS，CSI-RS用于信道监测。附图8是一个现有LTE小区中基于正常循环前缀(Normal CP-Normal Cyclic Prefix)的CSI-RS图案-同时标示出了CRS和URS，其中一个小方格是LTE的最小资源单位-资源粒子(RE-Resource Element)。LTE系统采用端口的概念定义RS资源：一个RS端口由一个天线端口发送，一个天线端口可能映射到一根物理天线，也有可能是由多根物理天线通过天线虚拟化(即合并叠加)形成一根虚拟的天线。对于URS而言，RS端口由{在PRB对内占用的RE的图案,OCC(Orthogonal Covering Code，正交覆盖码)}定义。附图8中标识的数字是RS端口号(由相应端口号的天线端口发送)，即RS端口 0～3是CRS，RS端口7～10是DMRS，RS端口15～22是CSI-RS。其中URS和CSI-RS采用了长度为2的正交覆盖码(OCC-Orthogonal Covering Code)。
作为一种新的蜂窝网天线架构，Massive MIMO近来成为一个研究热点。Massive MIMO系统的典型特点是通过增加天线阵列单元的数量到较大的值从而获得一系列增益，例如，系统容量理论上随着天线数量的增加而持续增加；发射天线信号的相干叠加降低发射功率等等。Massive MIMO的典型应用场景是通过增加空分复用的多用户数量提高频谱效率。Massive MIMO所面临的一个挑战是下行DMRS的开销可能过大。以LTE R(Release，版本)10为例，最多支持4个UE(User Equipment，用户设备)进行多用户传输，每一个PRB(Physical Resource Block，物理资源块)对分配了24个RE作为URS，占所有可用RE的14.3％。
假定Massive MIMO使用相同的URS密度(Density)同时支持20个UE进行多用户传输，则DMRS占所有可用资源的71.4％，再考虑到控制信令的开销，剩下很少比例的RE用于数据传输，大大降低了传输效率。
本申请针对这一问题公开了一种解决方案。需要说明的是，在不冲突的情况下，本申请的UE(User Equipment，用户设备)中的实施例和实施例中的特征可以应用到基站中，反之亦然。进一步的，在不冲突的情况下，本申请的实施例和实施例中的特征可以任意相互组合。
发明内容
传统的MU(Multiple User，多用户)-MIMO中，针对给定UE的预编码向量通常受到配对UE的影响以降低用户间干扰。典型的动态调度策略是在不同的调度时间窗中灵活的选择互相配对的UE，即UE配对在不同的调度时间窗中通常是不固定的。因此，UE的预编码向量在不同调度时间窗中是不固定的，即UE不能利用多个调度时间窗的URS进行信道估计。
发明人通过研究发现，随着天线数量的增加，不同UE之间的信道的随机化特征更加明显。对于(天线数量足够多的)Massive MIMO而言，针对给定UE的预编码向量采用MRT(Maximum Ratio Transmission，最大比发送)的 准则也能较好地避免用户间干扰。即针对给定UE的预编码向量有可能不再受配对UE的影响。
根据上述分析，本申请公开了一种支持跨时间窗的信道估计的UE中的方法，其中,包括如下步骤：
-步骤A.在K个时间窗中分别接收K个参考信号，根据所述K个参考信号估计当前时间窗的信道参数。
其中，所述K个参考信号是UE特定的，所述K是正整数，当前时间窗是所述K个时间窗中最新的一个，所述时间窗是时间域的基本调度单位。
上述方法的本质是UE对多个调度单位中的参考信号执行联合信道估计。考虑到典型的MU-MIMO应用场景是低速移动场景，时间域的插值能显著提高信道估计性能。由于Massive MIMO中的预编码向量受配对UE的影响较小，上述方法不会明显影响用户调度的灵活性。
作为一个实施例，所述UE特定的是指：所述K个参考信号的调度信令都是UE特定的(即不是小区公共信令)。
作为一个实施例，所述UE特定的是指：所述K个参考信号的配置参数是UE特定的，所述配置参数包括{RS端口索引，RS端口数量，RS序列的(部分或者全部)生成参数，所占用的频带，OCC}中的至少之一。
作为一个实施例，所述K个时间窗是连续的。
作为一个实施例，所述K个时间窗是离散的。
作为一个实施例，所述UE采用维纳滤波器的信道估计算法得到当前时间窗的信道参数。
作为一个实施例，一个所述时间窗是一个LTE子帧。
作为一个实施例，一个所述时间窗是一个LTE时隙(0.5毫秒，适用于正在讨论中的短TTI调度)。
作为一个实施例，一个所述时间窗不超过1毫秒。
作为一个实施例，一个所述时间窗是适用于高载频(大于6GHz)无线通信系统中的一个超短子帧。作为一个实施例，所述超短子帧的持续时间是0.2 毫秒。
作为一个实施例，所述信道参数是无线信道的CIR(Channel Impulse Response，信道冲激响应)。
作为一个实施例，所述K个参考信号各自所占用的频带是相同的。本实施例能确保所述UE获得优越的信道估计性能，然而代价是造成了一定的调度限制-即所述UE在K个时间窗中占用相同的频带。然而考虑到Massive MIMO场景中，MU-MIMO所能支持的最大用户数是一个较大的数字，上述调度限制不会显著影响资源分配的灵活性。
作为一个实施例，所述K个参考信号中至少有两个参考信号所占用的频带不完全相同。本实施例可能会降低信道估计性能(由于频域插值所带来的误差)以及导致信道估计的复杂度上升，然而本实施例没有造成调度限制。
作为一个实施例，目标频带中的至少部分频带和当前频带中的至少部分频带在频域上是相关的(相关带宽由无线信道的最大多径延时确定)。所述目标频带是所述K个参考信号中任意一个参考信号所占用的频带，所述当前频带是当前时间窗中的参考信号所占用的频带。
作为一个实施例，所述K大于1。
具体的，根据本申请的一个方面，其中还包括如下步骤：
-步骤B.根据所述当前时间窗的信道参数对在当前时间窗接收的下行信号进行信道均衡。
作为一个实施例，所述信道均衡采用MMSE(Minimum Mean Square Error，最小均方误差)准则。
具体的，根据本申请的一个方面，其中所述步骤A还包括如下步骤：
-步骤A0.接收第一信令，第一信令指示观测周期，所述观测周期包括M个连续的时间窗。
其中，所述K个时间窗属于同一个观测周期。
作为一个实施例，所述UE假定一个观测周期内的参考信号由相同的(一个或者多个)天线端口发送。
作为一个实施例，第一信令是高层信令。
作为上述方面的一个实施例，所述K等于1。
具体的，根据本申请的一个方面，其中所述参考信号的RS序列是时间窗特定的。
作为一个实施例，给定参考信号的RS序列的初始值和给定参考信号所占用的时间窗的索引有关。作为一个子实施例，所占用的时间窗的索引是所占用的时间窗在观测周期中的索引。作为又一个子实施例，所述时间窗是LTE子帧，所占用的时间窗的索引是所占用的时间窗在LTE无线帧中的索引。
作为一个实施例，给定参考信号的RS序列的第m个元素的实部和虚部的生成参数分别包括伪随机序列的第2m个元素和第2m+1个元素，所述伪随机序列的初始值的生成参数包括给定参考信号所占用的时间窗的索引。
具体的，根据本申请的一个方面，其中所述UE从目标时间窗集合中自行选择所述K个时间窗，所述目标时间窗集合是由一个观测周期中的所有目标时间窗组成，所述目标时间窗是指所述UE被调度进行下行接收的时间窗。
上述方面中，UE能够根据诸如当前无线信道的相关时间(Coherent Time)和相关带宽从目标时间窗集合中自行选择所述K个时间窗，而不是被强制利用所有目标时间窗集合中的目标时间窗，降低了信道估计的复杂度。
作为一个实施例，只有当UE检测到调度信令时，相应的时间窗中的下行RS才可能被用于当前时间窗的信道估计。本实施例的好处是基站不用在一个观测周期中的每一个时间窗中发送针对目标UE的下行RS。
作为一个实施例，所述UE接收K个DCI(Downlink Control Information，下行控制信息)，所述K个DCI分别调度所述K个时间窗中的下行数据传输。
具体的，根据本申请的一个方面，其中所述参考信号包括L个RS端口，所述K个参考信号中至少包括两个参考信号，其中一个参考信号中的至少一个RS端口的索引是另一个参考信号的L个RS端口的索引之外的值。
作为一个实施例，所述RS端口的定义参数包括{在一个基本资源块内所占用的RE，在同一个子载波上的OCC索引，RS序列}中的至少前两者，所述 基本资源块在时域上占用一个时间窗，在频域上占用一个频域的基本调度单位。作为一个实施例，一个基本资源块是一个PRB(Physical Resource Block，物理资源块)对(Pair)。
作为一个实施例，所述RS端口的索引是非负整数。
作为一个实施例，所有时间窗中的RS端口的索引的取值范围是相同的。
具体的，根据本申请的一个方面，其中所述K个参考信号由L个天线端口发送，每个参考信号中的L个RS端口按照缺省的排序方式分别由所述L个天线端口发送。
上述方面的好处是为基站侧的调度提供最大的灵活性。基站不需要在K个时间窗中为所述UE分配固定的L个RS端口，而仅确保每个参考信号包括L个RS端口即可。
作为一个实施例，每个参考信号中的L个RS端口按照RS端口索引的大小排序，并分别由所述L个天线端口发送。
本申请公开了一种支持大规模MIMO的基站中的方法，其中,包括如下步骤：
-步骤A.在K个时间窗中分别发送K个参考信号。所述K个参考信号能够被UE用于估计当前时间窗的信道参数。
其中，所述K个参考信号是UE特定的，所述K是正整数，当前时间窗是所述K个时间窗中最新的一个，所述时间窗是时间域的基本调度单位。
具体的，根据本申请的一个方面，其中所述步骤A还包括如下步骤：
-步骤A0.发送第一信令，第一信令指示观测周期，所述观测周期包括M个连续的时间窗。
其中，所述K个时间窗属于同一个观测周期。
具体的，根据本申请的一个方面，其中所述参考信号的RS序列是时间窗特定的。
具体的，根据本申请的一个方面，其中所述参考信号包括L个RS端口，所述K个参考信号中至少包括两个参考信号，其中一个参考信号中的至少一个RS端口的索引是另一个参考信号的L个RS端口的索引之外的值。
作为一个实施例，所述时间窗是LTE子帧，所述RS端口在PRB对内的图案重用一个URS端口在PRB对内的图案。
具体的，根据本申请的一个方面，其中所述K个参考信号由L个天线端口发送，每个参考信号中的L个RS端口按照缺省的排序方式分别由所述L个天线端口发送。
作为一个实施例，所述天线端口是由多根物理天线通过天线虚拟化的方法生成的。
本申请公开了一种支持跨时间窗的信道估计的用户设备，其中该设备包括：
第一模块：用于在K个时间窗中分别接收K个参考信号，根据所述K个参考信号估计当前时间窗的信道参数
第二模块：用于根据所述当前时间窗的信道参数对在当前时间窗接收的下行信号进行信道均衡。
其中，所述K个参考信号是UE特定的，所述K是正整数，当前时间窗是所述K个时间窗中最新的一个，所述时间窗是时间域的基本调度单位。所述K个参考信号由L个天线端口发送，每个参考信号中的L个RS端口按照缺省的排序方式分别由所述L个天线端口发送。
作为一个实施例，上述用户设备的特征在于，第一模块还用于接收第一信令，第一信令指示观测周期，所述观测周期包括M个连续的时间窗。其中，所述K个时间窗属于同一个观测周期。
本申请公开了一种支持大规模MIMO的基站设备，其中该设备包括：
第一模块：用于在K个时间窗中分别发送K个参考信号。
其中，所述K个参考信号是UE特定的，所述K是正整数，当前时间窗是所述K个时间窗中最新的一个，所述时间窗是时间域的基本调度单位。所述K个参考信号由L个天线端口发送，每个参考信号中的L个RS端口按照缺省的排序方式分别由所述L个天线端口发送。
作为一个实施例，上述基站设备的特征在于，第一模块还用于发送第一信令，第一信令指示观测周期，所述观测周期包括M个连续的时间窗。其中，所述K个时间窗属于同一个观测周期。
和传统方案相比，本申请具备如下优势：
-.在不增加RS密度的前提下，提高信道估计性能；或者在相同信道估计性能的前提下，降低RS密度；
-.尽可能的保持了用户调度灵活性。
附图说明
通过阅读参照以下附图所作的对非限制性实施例所作的详细描述，本申请的其它特征、目的和优点将会变得更加明显：
图1示出了根据本申请的一个实施例的利用K个参考信号执行信道估计的流程图；
图2示出了根据本申请的一个实施例的参考信号在不同时间窗中的占用带宽发生了变化的示意图；
图3示出了根据本申请的一个实施例的RS端口到天线端口映射的示意图；
图4示出了根据本申请的一个实施例的参考信号在不同时间窗中的密度保持一致的示意图；
图5示出了根据本申请的一个实施例的参考信号在不同时间窗中的密度发生变化的示意图；
图6示出了根据本申请的一个实施例的用于UE中的处理装置的结构框 图；
图7示出了根据本申请的一个实施例的用于基站中的处理装置的结构框图；
图8示出了LTE系统中的一个PRB对中的下行RS的示意图，其中数字对应天线端口索引。
具体实施方式
下文将结合附图对本申请的技术方案作进一步详细说明，需要说明的是，在不冲突的情况下，本申请的实施例和实施例中的特征可以任意相互组合。
实施例1
实施例1示例了利用K个参考信号执行信道估计的流程图，如附图1所示。附图1中，基站N1是UE U2的服务小区的维持基站。附图1中，方框F1和方框F2中的步骤分别是可选步骤。
对于基站N1，在步骤S101中发送第一信令，第一信令指示观测周期，所述观测周期包括M个连续的时间窗。在步骤S102中在K个时间窗中分别发送K个参考信号。
对于UE U2，在步骤S201中接收第一信令。在步骤S202中在K个时间窗中分别接收K个参考信号，根据所述K个参考信号估计当前时间窗的信道参数。在步骤S203中根据所述当前时间窗的信道参数对在当前时间窗接收的下行信号进行信道均衡。
实施例1中，所述K个参考信号是UE特定的，所述K是正整数，当前时间窗是所述K个时间窗中最新的一个，所述时间窗是时间域的基本调度单位。所述K个时间窗属于同一个观测周期。
作为实施例1的子实施例1，第一信令是RRC(Radio Resource Control，无线资源控制)层信令。
作为实施例1的子实施例2，在步骤S202中，所述UE从目标时间窗集合中自行选择所述K个时间窗，所述目标时间窗集合是由一个观测周期中的 所有目标时间窗组成。所述目标时间窗是指所述UE被调度进行下行接收的时间窗，即所述UE能检测到用于调度在所述目标时间窗中进行下行接收的下行信令-所述下行接收是基于UE特定的参考信号。所述自行选择满足如下两个标准：
-.目标频带中的至少部分频带和当前频带中的至少部分频带在频域上是相关的。所述目标频带是所述K个参考信号中任意一个参考信号所占用的频带，所述当前频带是当前时间窗中的参考信号所占用的频带；
-.所述K个时间窗中的任意一个时间窗和当前时间窗在时域上是相关的(相关时间通常由UE的移动速度决定)。
作为实施例1的子实施例3，所述K个参考信号分别是由K个DCI(Downlink Control Information，下行控制信息)所调度的，所述K个DCI分别还调度所述K个时间窗中的下行数据传输。
实施例2
实施例2示例了参考信号在不同时间窗中的占用带宽发生了变化的示意图，如附图2所示。附图2中，斜线标识的方格是一个参考信号所占用的时频资源块。
实施例2中，本申请中的所述K个时间窗包括第一时间窗，第二时间窗和当前时间窗，即所述K为3。本申请中的所述K个参考信号在所述K个时间窗中的至少两个时间窗中所占用的带宽发生了变化。
实施例2中，所述K个时间窗属于同一个时间周期，一个时间周期包括正整数个连续的时间窗。多个时间周期在时域上是连续的并且循环出现的(直到被下行信令更新为止)。
实施例2的优点在于为系统调度提供了最大的灵活性，即不限制所述K个参考信号占用相同的带宽。实施例2可能会增加UE侧用于处理信道估计的模块的复杂度，然而UE能够通过实现相关的办法(例如选择部分频带上的参考信号)将复杂度控制在可接受的程度。
实施例3
实施例3示例了RS端口到天线端口映射的示意图，如附图3所示。
实施例3中，UE在K个时间窗中分别接收K个参考信号，根据所述K个参考信号估计当前时间窗的信道参数。所述参考信号包括L个RS端口，所述L为4。所述K个参考信号中包括第一参考信号和第二参考信号。第一参考信号在第一时间窗中传输，第一参考信号的L个RS端口的索引分别是{n_1，n_2，n_3，n_4}；第二参考信号在第二时间窗中传输，第二参考信号的L个RS端口的索引分别是{n_1，n_3，n_4，n_7}。其中，n_1，n_2，n_3，n_4，n_7分别是整数。第一参考信号中的RS端口n_2的索引值是第二参考信号的L个RS端口的索引之外的值。
实施例3中，所述K个参考信号分别由相同的L个天线端口(即天线端口#{1，2，3，4})发送，每个参考信号中的L个RS端口按照缺省的排序方式(即不需要信令配置)分别由所述L个天线端口发送。对于第一参考信号，RS端口{n_1，n_2，n_3，n_4}分别由天线端口#{1，2，3，4}发送；对于第二参考信号，RS端口{n_1，n_3，n_4，n_7}分别由天线端口#{1，2，3，4}发送。
作为实施例3的子实施例1，n_1，n_2，n_3，n_4，n_7是依次增加的整数序列，即n_1<n_2<n_3<n_4<n_7。
作为实施例3的子实施例2，n_1>n_2>n_3>n_4>n_7是依次减小的整数序列。
作为实施例3的子实施例3，一个时间窗中最多容纳16个UE特定的RS端口，相应的16个索引是：{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}。
实施例4
实施例4示例了参考信号在不同时间窗中的密度保持一致的示意图，如附图4所示。附图4中，斜线标识的方格是第一参考信号占用的RE(Resource Element，资源粒子)，反斜线标识的方格是第二参考信号占用的RE。
实施例4中，本申请中的所述K个参考信号包括第一参考信号和第二参 考信号，本申请中的时间窗是LTE子帧。第一参考信号在第一LTE子帧中传输，第二参考信号在第二LTE子帧中传输。PRB(Physical Resource Block，物理资源块)#v1是第一参考信号在频域上所占用的PRB中的一个，PRB#v2是第二参考信号在频域上所占用的PRB中的一个。PRB在频域的索引v1和v2分别是整数。
附图4中，一个PRB对中的OFDM(Orthogonal Frequency Division Multiplexing，正交频分复用)符号的索引是0，1，…，13；子载波的索引是0，1，…，11。
作为实施例4的子实施例1，PRB对采用普通循环前缀(Normal cyclic prefix)，所述K个参考信号由FDD(Frequency Division Duplex，频分双工)小区发送。给定参考信号的RS端口p在一个PRB对的{子载波k，OFDM符号l}上的复数值的调制符号(Modulation Symbols)
Figure PCTCN2016105266-appb-000001
是由参考信号序列rt_w(m)按照如下方式映射：
Figure PCTCN2016105266-appb-000002
其中
Figure PCTCN2016105266-appb-000003
k＝5m'+12·nPRB+1
l＝l'mod 2+5
Figure PCTCN2016105266-appb-000004
m'＝0,1,2
Figure PCTCN2016105266-appb-000005
是系统带宽内的最大PRB数，ns是LTE时隙在LTE无线帧中的索引，nPRB是PRB的频域索引，即对于PRB对#v1：nPRB＝v1；对于PRB对#v2：nPRB＝v2。OCC序列
Figure PCTCN2016105266-appb-000006
参考3GPP标准TS36.211的表格6.10.3.2-1。
RS序列rt_w(m)是时间窗相关的，t_w是时间窗在观测周期中的索引，即对于PRB对#v1：t_w是第一LTE子帧在观测周期中的索引；对于PRB对#v2：t_w是第二LTE子帧在观测周期中的索引。
作为实施例4的子实施例2，
Figure PCTCN2016105266-appb-000007
伪随机序列c(i)参考TS36.211的6.10.3.1节。
作为实施例4的子实施例3，第一参考信号和第二参考信号的目标接收者是第一UE。在第二参考信号所占用的RE上，基站发送针对第二UE的第三参考信号，第二参考信号和第三参考信号的OCC是相同的，第二参考信号和第三参考信号的RS序列是伪正交的(即伪随机序列的生成器的初始值不同)。该子实施例中，第一UE能够利用第一参考信号和第二参考信号对第二LTE子帧中的无线信道进行信道估计，降低第三参考信号的干扰。增加了参考信号的容量，同时不会显著降低信道估计性能。
实施例5
实施例5示例了参考信号在不同时间窗中的密度发生变化的示意图，如附图5所示。附图5中，斜线标识的方格是第一参考信号占用的RE，反斜线标识的方格是第二参考信号占用的RE。
实施例5中，本申请中的所述K个参考信号包括第一参考信号和第二参考信号，本申请中的时间窗是LTE子帧。第一参考信号在第一LTE子帧中传输，第二参考信号在第二LTE子帧中传输。PRB#v1是第一参考信号在频域上所占用的PRB中的一个，PRB#v2是第二参考信号在频域上所占用的PRB中的一个。PRB在频域的索引v1和v2分别是整数。
实施例5中，所述K个参考信号中至少有两个参考信号在一个PRB对内的密度是不同的。
如附图5所示，第一参考信号在PRB#v1中的密度大于第二参考信号在PRB#v2中的密度。虽然PRB#v2中的参考信号的密度较低，但是UE能够根据第一参考信号和第二参考信号对第二LTE子帧中的无线信道进行信道估计，在减少参考信号开销(Overhead)的前提下保证了信道估计性能。
实施例6
实施例6是用于UE中的处理装置的结构框图，如附图6所示。附图4中，UE装置200由第一模块201和第二模块202组成。
第一模块201用于在K个时间窗中分别接收K个参考信号，根据所述K个参考信号估计当前时间窗的信道参数。第二模块202用于根据所述当前时间窗的信道参数对在当前时间窗接收的下行信号进行信道均衡。
实施例6中，所述K个参考信号是UE特定的，所述K是大于1的正整数，当前时间窗是所述K个时间窗中最新的一个，所述时间窗是时间域的基本调度单位。所述K个参考信号由L个天线端口发送，每个参考信号中的L个RS端口按照缺省的排序方式分别由所述L个天线端口发送。
作为实施例6的子实施例1，第一模块还用于接收第一信令，第一信令指示观测周期，所述观测周期包括M个连续的时间窗。其中，所述K个时间窗属于同一个观测周期。第一信令是高层信令。
作为实施例6的子实施例2，所述参考信号包括L个RS端口，所述K个参考信号中至少包括第一参考信号和第二参考信号，第一参考信号中至少一个RS端口的索引是第二参考信号的L个RS端口的索引之外的值。所述L是正整数。所述K个参考信号由L个天线端口发送，每个参考信号中的L个RS端口按照缺省的排序方式分别由所述L个天线端口发送。
作为实施例6的子实施例3，所述时间窗是LTE子帧，所述RS端口在PRB对内所占用的RE图案重用LTE URS端口在PRB对内所占用的图案。所述URS端口是RS端口{7，8，9，10，11，12，13，14}中的一个。
实施例7
实施例7是用于基站中的处理装置的结构框图，如附图7所示。附图7中，基站装置300由第一模块301组成。
第一模块301用于发送第一信令以及在K个时间窗中分别发送K个参考信号。
实施例7中，所述K个参考信号是UE特定的，所述K是正整数，当前时间窗是所述K个时间窗中最新的一个(即最迟发生)，所述时间窗是时间域 的基本调度单位。所述K个参考信号由L个天线端口发送，每个参考信号中的L个RS端口按照缺省的排序方式分别由所述L个天线端口发送。第一信令指示观测周期，所述观测周期包括M个连续的时间窗。其中，所述K个时间窗属于同一个观测周期。
作为实施例7的子实施例1，所述K为1。
作为实施例7的子实施例2，第一信令指示所述观测周期中的时间窗的长度。所述观测周期的起始时间窗是缺省配置的。
作为实施例7的子实施例3，所述时间窗是LTE子帧，所述RS端口在PRB对内所占用的RE图案重用一个LTE URS端口在PRB对内所占用的图案。
本领域普通技术人员可以理解上述方法中的全部或部分步骤可以通过程序来指令相关硬件完成，所述程序可以存储于计算机可读存储介质中，如只读存储器，硬盘或者光盘等。可选的，上述实施例的全部或部分步骤也可以使用一个或者多个集成电路来实现。相应的，上述实施例中的各模块单元，可以采用硬件形式实现，也可以由软件功能模块的形式实现，本申请不限于任何特定形式的软件和硬件的结合。本申请中的UE包括但不限于手机，平板电脑，笔记本，上网卡等无线通信设备。本申请中的基站包括但不限于宏蜂窝基站，微蜂窝基站，家庭基站，中继基站等无线通信设备。
以上所述，仅为本申请的较佳实施例而已，并非用于限定本申请的保护范围。凡在本申请的精神和原则之内，所做的任何修改，等同替换，改进等，均应包含在本申请的保护范围之内。

Claims (16)

  1. 一种支持跨时间窗的信道估计的UE中的方法，包括：
    -步骤A.在K个时间窗中分别接收K个参考信号，根据所述K个参考信号估计当前时间窗的信道参数；
    其中，所述K个参考信号是UE特定的，所述K是正整数，当前时间窗是所述K个时间窗中最新的一个，所述时间窗是时间域的基本调度单位。
  2. 根据权利要求1所述的方法，还包括如下步骤：
    -步骤B.根据所述当前时间窗的信道参数对在当前时间窗接收的下行信号进行信道均衡。
  3. 根据权利要求1所述的方法，其中所述步骤A还包括如下步骤：
    -步骤A0.接收第一信令，第一信令指示观测周期，所述观测周期包括M个连续的时间窗；
    其中，所述K个时间窗属于同一个观测周期。
  4. 根据权利要求1所述的方法，其中所述参考信号的RS序列是时间窗特定的。
  5. 根据权利要求3所述的方法，其中所述UE从目标时间窗集合中自行选择所述K个时间窗，所述目标时间窗集合是由一个观测周期中的所有目标时间窗组成，所述目标时间窗是指所述UE被调度进行下行接收的时间窗。
  6. 根据权利要求1-5所述的方法，其中所述参考信号包括L个RS端口，所述K个参考信号中至少包括两个参考信号，其中一个参考信号中的至少一个RS端口的索引是另一个参考信号的L个RS端口的索引之外的值。
  7. 根据权利要求1，6所述的方法，其中所述K个参考信号由L个天线端口发送，每个参考信号中的L个RS端口按照缺省的排序方式分别由所述L个天线端口发送。
  8. 一种支持大规模MIMO的基站中的方法，包括：
    -步骤A.在K个时间窗中分别发送K个参考信号。所述K个参考信号能 够被UE用于估计当前时间窗的信道参数；
    其中，所述K个参考信号是UE特定的，所述K是正整数，当前时间窗是所述K个时间窗中最新的一个，所述时间窗是时间域的基本调度单位。
  9. 根据权利要求8所述的方法，其中所述步骤A还包括如下步骤：
    -步骤A0.发送第一信令，第一信令指示观测周期，所述观测周期包括M个连续的时间窗；
    其中，所述K个时间窗属于同一个观测周期。
  10. 根据权利要求8所述的方法，其中所述参考信号的RS序列是时间窗特定的。
  11. 根据权利要求8-10所述的方法，其中所述参考信号包括L个RS端口，所述K个参考信号中至少包括两个参考信号，其中一个参考信号中的至少一个RS端口的索引是另一个参考信号的L个RS端口的索引之外的值。
  12. 根据权利要求8，11所述的方法，其中所述K个参考信号由L个天线端口发送，每个参考信号中的L个RS端口按照缺省的排序方式分别由所述L个天线端口发送。
  13. 一种支持跨时间窗的信道估计的用户设备，其中该设备包括：
    第一模块：用于在K个时间窗中分别接收K个参考信号，根据所述K个参考信号估计当前时间窗的信道参数；以及
    第二模块：用于根据所述当前时间窗的信道参数对在当前时间窗接收的下行信号进行信道均衡；
    其中，所述K个参考信号是UE特定的，所述K是正整数，当前时间窗是所述K个时间窗中最新的一个，所述时间窗是时间域的基本调度单位。所述K个参考信号由L个天线端口发送，每个参考信号中的L个RS端口按照缺省的排序方式分别由所述L个天线端口发送。
  14. 根据权利要求13所述的设备，其中第一模块还用于接收第一信令，第一信令指示观测周期，所述观测周期包括M个连续的时间窗，其中，所述K个时间窗属于同一个观测周期。
  15. 一种支持大规模MIMO的基站设备，其中该设备包括：
    第一模块：用于在K个时间窗中分别发送K个参考信号。
    其中，所述K个参考信号是UE特定的，所述K是正整数，当前时间窗是所述K个时间窗中最新的一个，所述时间窗是时间域的基本调度单位。所述K个参考信号由L个天线端口发送，每个参考信号中的L个RS端口按照缺省的排序方式分别由所述L个天线端口发送。
  16. 根据权利要求15所述的基站设备，其中第一模块还用于发送第一信令，第一信令指示观测周期，所述观测周期包括M个连续的时间窗。其中，所述K个时间窗属于同一个观测周期。
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