WO2017080472A1 - Procédé et dispositif de transmission mimo - Google Patents

Procédé et dispositif de transmission mimo 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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PCT/CN2016/105266
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English (en)
Chinese (zh)
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张晓博
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上海朗帛通信技术有限公司
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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
    • 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
    • H04L25/03—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 signaling, 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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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Mathematical Physics (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

La présente invention concerne un procédé et un dispositif de transmisison MIMO. Dans un mode de réalisation, le procédé comprend : réception, par un UE, de K signaux de référence respectivement dans K fenêtres temporelles et estimation d'une référence de canal de la fenêtre temporelle actuelle sur la base des K signaux de référence. Les K signaux de référence sont spécifiques à l'UE, K étant un entier positif, la fenêtre temporelle actuelle est la fenêtre temporelle la plus récente des K fenêtres temporelles, et la fenêtre temporelle est une unité d'ordonnancement de base d'un domaine temporel. La solution technique selon la présente invention permet de résoudre le problème de temps système important pour la démodulation des signaux de référence dans un scénario MIMO à grande échelle, maintenant ainsi dans une grande mesure la flexibilité d'ordonnancement de l'utilisateur.
PCT/CN2016/105266 2015-11-10 2016-11-10 Procédé et dispositif de transmission mimo WO2017080472A1 (fr)

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CN113497700A (zh) * 2017-09-27 2021-10-12 上海朗帛通信技术有限公司 一种被用于无线通信的用户设备、基站中的方法和装置
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CN113544996A (zh) * 2021-06-11 2021-10-22 北京小米移动软件有限公司 时域窗口确定方法、装置、用户设备、基站及存储介质

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