CN106685498A - MIMO transmission method and device - Google Patents

Abstract

The invention provides a MIMO transmission method and device. In an embodiment, the UE receives K reference signals in K time windows respectively, and estimates channel parameters of the current time window according to the K reference signals. Wherein, the K reference signals are specific to the UE, the K is a positive integer, the current time window is the latest one among the K time windows, and the time window is a basic scheduling unit in the time domain. By using the technical solution provided in the present invention, the problem of excessive demodulation reference signal overhead in massive MIMO is solved, while maintaining user scheduling flexibility as much as possible.

Description

A MIMO transmission method and device

technical field

The present invention relates to the scheme of reference signal design in the field of mobile communication technology, in particular to the downlink demodulation reference signal (DMRS-Demodulation Reference Signal) scheme.

Background technique

In the traditional 3rd Generation Partnership Project (3GPP–3rd Generation Partner Project) Long Term Evolution (LTE-Long Term Evolution) system, three downlink reference signals are defined:

●CRS (Cell specific Reference Signal, cell specific reference signal)

●URS (UE specific Reference Signal, UE specific reference signal)

●CSI-RS (CSI Reference Signal, channel status indication reference signal)

The above CRS and URS can be used for data demodulation - ie belong to DMRS, and CSI-RS is used for channel monitoring. Figure 8 is a normal cyclic prefix (Normal CP-Normal Cyclic Prefix)-based CSI-RS pattern in an existing LTE cell - both CRS and URS are marked, and a small square is the minimum resource unit of LTE - a resource element (RE-Resource Element). The LTE system uses the concept of ports to define RS resources: one RS port is sent by one antenna port, and one antenna port may be mapped to one physical antenna, or it may be formed by multiple physical antennas through antenna virtualization (that is, combining and superimposing). virtual antenna. For the URS, the RS port is defined by {pattern of REs occupied in the PRB pair, OCC (Orthogonal Covering Code, Orthogonal Covering Code)}. The number marked in Figure 8 is the RS port number (sent by the antenna port of the corresponding port number), that is, RS ports 0-3 are CRS, RS ports 7-10 are DMRS, and RS ports 15-22 are CSI-RS. The URS and the CSI-RS use an orthogonal covering code (OCC-Orthogonal Covering Code) with a length of 2.

As a new antenna architecture for cellular networks, Massive MIMO has recently become a research hotspot. The 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. For example, the system capacity theoretically increases continuously with the increase in the number of antennas; the coherent superposition of the transmitting antenna signals reduces the transmitting power wait. A typical application scenario of Massive MIMO is to improve spectrum efficiency by increasing the number of multiple users in space division multiplexing. One challenge faced by Massive MIMO is that the overhead of downlink DMRS may be too large. Taking LTE R (Release, version) 10 as an example, up to 4 UEs (User Equipment, user equipment) are supported for multi-user transmission, and each PRB (Physical Resource Block, physical resource block) pair is allocated 24 REs as URS, 14.3% of all available REs.

Assuming that Massive MIMO uses the same URS density (Density) to support 20 UEs for multi-user transmission at the same time, DMRS accounts for 71.4% of all available resources, and considering the overhead of control signaling, a small proportion of REs are left for data transmission, greatly reducing the transmission efficiency.

The present invention discloses a solution to this problem. It should be noted that, if there is no conflict, the embodiments in the UE (User Equipment, user equipment) of this application and the features in the embodiments can be applied to the base station, and vice versa. Further, in the case of no conflict, the embodiments of the present application and the features in the embodiments can be combined with each other arbitrarily.

Contents of the invention

In traditional MU (Multiple User, multi-user)-MIMO, the precoding vector for a given UE is usually affected by the paired UE to reduce inter-user interference. A typical dynamic scheduling strategy 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 use the URS of multiple scheduling time windows for channel estimation.

The inventors found through research that as the number of antennas increases, the randomization characteristics of channels between different UEs become more obvious. For Massive MIMO (with a sufficient number of antennas), using the MRT (Maximum Ratio Transmission, Maximum Ratio Transmission) criterion for the precoding vector of a given UE can also better avoid inter-user interference. That is, the precoding vector for a given UE may no longer be affected by the paired UE.

According to the above analysis, the present invention discloses a method in UE supporting channel estimation across time windows, which includes the following steps:

- Step A. 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.

Wherein, the K reference signals are UE-specific, the K is a positive integer, the current time window is the latest one of the K time windows, and the time window is a basic scheduling unit in the time domain.

The essence of the above method is that the UE performs joint channel estimation on the reference signals in multiple scheduling units. Considering that typical MU-MIMO application scenarios are low-speed mobile scenarios, interpolation in the time domain can significantly improve channel estimation performance. Since the precoding vector in Massive MIMO is less affected by the paired UE, the above method will not obviously affect the flexibility of user scheduling.

As an embodiment, the UE-specific means that the scheduling signaling of the K reference signals is all UE-specific (that is, not cell-common signaling).

As an embodiment, the UE-specific means: the configuration parameters of the K reference signals are UE-specific, and the configuration parameters include {RS port index, RS port quantity, (part or all) generation of RS sequence parameter, occupied frequency band, and at least one of OCC}.

As an embodiment, the K time windows are continuous.

As an embodiment, the K time windows are discrete.

As an embodiment, the UE obtains channel parameters of the current time window by using a channel estimation algorithm of a Wiener filter.

As an embodiment, one time window is one LTE subframe.

As an embodiment, one said time window is one LTE time slot (0.5 milliseconds, suitable for the short TTI scheduling in question).

As an embodiment, one time window is no more than 1 millisecond.

As an embodiment, one time window is an ultra-short subframe suitable for a high carrier frequency (greater than 6 GHz) wireless communication system. As an embodiment, the duration of the ultra-short subframe is 0.2 milliseconds.

As an embodiment, the channel parameter is a CIR (Channel Impulse Response, channel impulse response) of a wireless channel.

As an embodiment, 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 restrictions—that is, the UE occupies the same frequency band in K time windows. However, considering that in the Massive MIMO scenario, the maximum number of users that MU-MIMO can support is a large number, the above scheduling restrictions will not significantly affect the flexibility of resource allocation.

As an embodiment, frequency bands occupied by at least two reference signals among the K reference signals are not completely the same. This embodiment may reduce the performance of channel estimation (due to the error caused by frequency domain interpolation) and increase the complexity of channel estimation, but this embodiment does not cause scheduling restrictions.

As an embodiment, at least part of the frequency bands in the target frequency band and at least part of the frequency bands in the current frequency band are correlated in the frequency domain (the correlation 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, and the current frequency band is a frequency band occupied by the reference signal in the current time window.

As an example, the K is greater than 1.

Specifically, according to one aspect of the present invention, it is characterized in that it also includes the following steps:

- Step B. Perform channel equalization on the downlink signal received in the current time window according to the channel parameters of the current time window.

As an embodiment, the channel equalization adopts an MMSE (Minimum Mean Square Error, minimum mean square error) criterion.

Specifically, according to one aspect of the present invention, it is characterized in that the step A further includes the following steps:

- Step A0. Receive a 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.

As an embodiment, the UE assumes that reference signals in one observation period are sent by the same (one or more) antenna ports.

As an embodiment, the first signaling is high-layer signaling.

As an embodiment of the above aspect, the K is equal to 1.

Specifically, according to an aspect of the present invention, it is characterized in that the RS sequence of the reference signal is specific to a time window.

As an embodiment, 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. As a sub-embodiment, the index of the occupied time window is the index of the occupied time window in the observation period. As yet another sub-embodiment, the time window is an LTE subframe, and the index of the occupied time window is an index of the occupied time window in the LTE radio frame.

As an embodiment, the generation parameters of the real part and the imaginary part 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 the index of the time window occupied by the given reference signal.

Specifically, according to an aspect of the present invention, it is characterized in that the UE selects the K time windows from a target time window set, and the target time window set is composed of all target time windows in an observation period , the target time window refers to a time window in which the UE is scheduled to perform downlink reception.

In the above aspect, the UE can select the K time windows from the set of target time windows according to the relevant time (Coherent Time) and relevant bandwidth of the current wireless channel, instead of being forced to use the target time in all target time window sets window, which reduces the complexity of channel estimation.

As an embodiment, only when the UE detects the scheduling signaling, the downlink RS in the corresponding time window may be used for channel estimation of the current time window. The advantage of this embodiment is that the base station does not need to send the downlink RS for the target UE in each time window in an observation period.

As an embodiment, the UE receives K pieces of DCI (Downlink Control Information, downlink control information), and the K pieces of DCI respectively schedule downlink data transmission in the K time windows.

Specifically, according to an aspect of the present invention, it is characterized in that the reference signal includes L RS ports, the K reference signals include at least two reference signals, and the index of at least one RS port in one reference signal is a value other than the index of the L RS ports of another reference signal.

As an embodiment, the definition parameters of the RS port include at least the first two of {REs occupied in a basic resource block, OCC index on the same subcarrier, RS sequence}, and the basic resource block is in A time window is occupied in the time domain, and a basic scheduling unit in the frequency domain is occupied in the frequency domain. As an embodiment, a basic resource block is a PRB (Physical Resource Block, physical resource block) pair (Pair).

As an embodiment, the index of the RS port is a non-negative integer.

As an embodiment, the value ranges of the indexes of the RS ports in all time windows are the same.

Specifically, according to one aspect of the present invention, it is characterized in that 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 according to the default sorting method. port to send.

The advantage of the above aspect is to provide the greatest flexibility for scheduling at the base station side. The base station does not need to allocate fixed L RS ports to the UE in the K time windows, but only ensures that each reference signal includes L RS ports.

As an embodiment, the L RS ports in each reference signal are sorted according to the size of the RS port index, and are sent by the L antenna ports respectively.

The invention discloses a method in a base station supporting massive MIMO, which includes the following steps:

- Step A. Sending K reference signals respectively in K time windows. The K reference signals can be used by the UE to estimate channel parameters of the current time window.

Wherein, the K reference signals are specific to the UE, the K is a positive integer, the current time window is the latest one among the K time windows, and the time window is a basic scheduling unit in the time domain.

Specifically, according to one aspect of the present invention, it is characterized in that the step A further includes the following steps:

- Step A0. Sending a 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.

Specifically, according to an aspect of the present invention, it is characterized in that the RS sequence of the reference signal is specific to a time window.

Specifically, according to an aspect of the present invention, it is characterized in that the reference signal includes L RS ports, the K reference signals include at least two reference signals, and the index of at least one RS port in one reference signal is a value other than the index of the L RS ports of another reference signal.

As an embodiment, the time window is an LTE subframe, and the pattern of the RS port in the PRB pair reuses the pattern of a URS port in the PRB pair.

Specifically, according to one aspect of the present invention, it is characterized in that 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 according to the default sorting method. port to send.

As an embodiment, the antenna port is generated by multiple physical antennas through an antenna virtualization method.

The present invention discloses a user equipment supporting channel estimation across time windows, which is characterized in that the equipment includes:

The first module: for receiving K reference signals in K time windows respectively, and estimating channel parameters of the 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 parameters of the current time window.

Wherein, the K reference signals are specific to the UE, the K is a positive integer, the current time window is the latest one among the K time windows, and the time window is a basic scheduling unit in 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 according to a default sorting manner.

As an embodiment, the above user equipment is characterized in that the first module is further configured to receive 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.

The invention discloses a base station device supporting massive MIMO, which is characterized in that the device includes:

The first module: used for sending K reference signals respectively in K time windows.

Wherein, the K reference signals are specific to the UE, the K is a positive integer, the current time window is the latest one among the K time windows, and the time window is a basic scheduling unit in 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 according to a default sorting manner.

As an embodiment, the above-mentioned base station device is characterized in that the first module is further configured to send a 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.

Compared with traditional solutions, the present invention has the following advantages:

-. Improve channel estimation performance without increasing RS density; or reduce RS density on the premise of the same channel estimation performance

-. Maintain the flexibility of user scheduling as much as possible.

Description of drawings

Other characteristics, objects and advantages of the present invention will become more apparent by reading the detailed description of non-limiting embodiments made with reference to the following drawings:

FIG. 1 shows a flow chart of performing channel estimation using K reference signals according to an embodiment of the present invention;

FIG. 2 shows a schematic diagram of changes in occupied bandwidths of reference signals in different time windows according to an embodiment of the present invention;

FIG. 3 shows a schematic diagram of RS port-to-antenna port mapping according to an embodiment of the present invention;

Fig. 4 shows a schematic diagram of keeping the density of reference signals consistent in different time windows according to an embodiment of the present invention;

Fig. 5 shows a schematic diagram of density changes of reference signals in different time windows according to an embodiment of the present invention;

FIG. 6 shows a structural block diagram of a processing device used in a UE according to an embodiment of the present invention;

Fig. 7 shows a structural block diagram of a processing device used in a base station according to an embodiment of the present invention;

FIG. 8 shows a schematic diagram of a downlink RS in a PRB pair in an LTE system, where the numbers correspond to antenna port indexes;

detailed description

The technical solutions of the present invention will be further described in detail below in conjunction with the accompanying drawings. It should be noted that, in the case of no conflict, the embodiments of the present application and the features in the embodiments can be combined arbitrarily.

Example 1

Embodiment 1 exemplifies the flow chart of performing channel estimation by using K reference signals, as shown in FIG. 1 . In FIG. 1 , base station N1 is the maintenance base station of the serving cell of UE U2. In Fig. 1, the steps in box F1 and box F2 are optional steps respectively.

For the base station N1, the first signaling is sent in step S101, the first signaling indicates an observation period, and the observation period includes M consecutive time windows. In step S102, K reference signals are respectively sent in K time windows.

For UE U2, the first signaling is received in step S201. In step S202, 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. In step S203, channel equalization is performed on the downlink signal received in the current time window according to the channel parameters of the current time window.

In Embodiment 1, the K reference signals are UE-specific, the K is a positive integer, the current time window is the latest one among the K time windows, and the time window is a basic scheduling unit in the time domain. The K time windows belong to the same observation period.

As a sub-embodiment 1 of Embodiment 1, the first signaling is RRC (Radio Resource Control, radio resource control) layer signaling.

As a sub-embodiment 2 of Embodiment 1, in step S202, the UE selects the K time windows from a set of target time windows by itself, and the set of target time windows consists of all target time windows in an observation period composition. The target time window refers to the time window in which the UE is scheduled for 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. Said self-selection meets the following two criteria:

-. At least part of the frequency bands in the target frequency band and at least part of the frequency bands in the current frequency band are correlated in the frequency domain. The target frequency band is a frequency band occupied by any one of the K reference signals, and the current frequency band is a frequency band occupied by the reference signal in the current time window.

-. Any one of the K time windows is related to the current time window in the time domain (the correlation time is usually determined by the moving speed of the UE).

As a sub-embodiment 3 of Embodiment 1, the K reference signals are respectively scheduled by K DCIs (Downlink Control Information, downlink control information), and the K DCIs are respectively scheduled in the K time windows downlink data transmission.

Example 2

Embodiment 2 illustrates a schematic diagram of changes in occupied bandwidths of reference signals in different time windows, as shown in FIG. 2 . In FIG. 2 , the grid marked with oblique lines is a time-frequency resource block occupied by a reference signal.

In Embodiment 2, the K time windows in the present invention include the first time window, the second time window and the current time window, that is, the K is 3. In the present invention, bandwidths occupied by the K reference signals in at least two of the K time windows are changed.

In Embodiment 2, 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 appear cyclically (until updated by downlink signaling).

The advantage of Embodiment 2 is that it provides maximum flexibility for system scheduling, that is, it does not restrict the K reference signals to occupy the same bandwidth. Embodiment 2 may increase the complexity of the channel estimation module on the UE side, but the UE can control the complexity to an acceptable level by implementing related methods (such as selecting reference signals on some frequency bands).

Example 3

Embodiment 3 illustrates a schematic diagram of mapping from RS ports to antenna ports, as shown in FIG. 3 .

In Embodiment 3, the UE receives K reference signals in K time windows respectively, and estimates channel parameters of the current time window according to the K reference signals. The reference signal includes L RS ports, where 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, and 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, and the second reference The indices of the L RS ports of the signal are respectively {n_1, n_3, n_4, n_7}. Among them, n_1, n_2, n_3, n_4, 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 indices of the L RS ports in the second reference signal.

In Embodiment 3, the K reference signals are respectively sent by the same L antenna ports (that is, antenna ports #{1, 2, 3, 4}), and the L RS ports in each reference signal follow the default The sorting mode (that is, no signaling configuration is required) is sent by the L antenna ports respectively. For the first reference signal, RS ports {n_1, n_2, n_3, n_4} are transmitted by antenna ports #{1, 2, 3, 4} respectively; for the second reference signal, RS ports {n_1, n_3, n_4, n_7} are transmitted by antenna ports #{1, 2, 3, 4} respectively.

As a sub-embodiment 1 of Embodiment 3, n_1, n_2, n_3, n_4, and n_7 are integer sequences that increase sequentially, that is, n_1<n_2<n_3<n_4<n_7.

As a sub-embodiment 2 of Embodiment 3, n_1>n_2>n_3>n_4>n_7 is a sequentially decreasing sequence of integers.

As a sub-embodiment 3 of Embodiment 3, a maximum of 16 UE-specific RS ports can be accommodated in a 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}.

Example 4

Embodiment 4 illustrates a schematic diagram of keeping the density of reference signals consistent in different time windows, as shown in FIG. 4 . In FIG. 4 , the squares marked with slashes are REs (Resource Elements) occupied by the first reference signal, and the squares marked with backslashes are REs occupied by the second reference signal.

In Embodiment 4, the K reference signals in the present invention include the first reference signal and the second reference signal, and the time window in the present invention is an LTE subframe. The first reference signal is transmitted in the first LTE subframe, and the second reference signal is transmitted in the second LTE subframe. PRB (Physical Resource Block, physical resource block) #v1 is one of the PRBs occupied by the first reference signal in the frequency domain, and PRB #v2 is one of the PRBs occupied by the second reference signal in the frequency domain. The indices v1 and v2 of the PRB in the frequency domain are integers respectively.

In FIG. 4 , indices of OFDM (Orthogonal Frequency Division Multiplexing, Orthogonal Frequency Division Multiplexing) symbols in a PRB pair are 0, 1, ..., 13; indices of subcarriers are 0, 1, ..., 11.

As a sub-embodiment 1 of Embodiment 4, a PRB pair adopts a normal cyclic prefix (Normal cyclic prefix), and the K reference signals are sent by an FDD (Frequency Division Duplex, Frequency Division Duplex) cell. The complex-valued modulation symbols (Modulation Symbols) of the RS port p of the given reference signal on {subcarrier k, OFDM symbol l} of a PRB pair is mapped by the reference signal sequence r ^t_w (m) as follows:

in

k=5m'+12 n _PRB +1

l=l'mod2+5

m'=0,1,2

is the maximum number of PRBs within the system bandwidth, n _s is the index of the LTE time slot in the LTE radio frame, and n _PRB is the frequency domain index of the PRB, that is, for PRB pair #v1: n _PRB = v1; for PRB pair #v2: n _PRB =v2. OCC sequence Refer to Table 6.10.3.2-1 of 3GPP standard TS36.211.

The RS sequence r ^t_w (m) is related to the time window, t_w is the index of the time window in the observation period, that is, for PRB pair #v1: t_w is the index of the first LTE subframe in the observation period; for PRB pair #v2 : t_w is the index of the second LTE subframe in the observation period.

As sub-embodiment 2 of embodiment 4,

Refer to Section 6.10.3.1 of TS36.211 for the pseudo-random sequence c(i).

As a sub-embodiment 3 of the embodiment 4, the target receiver of the first reference signal and the second reference signal is the first UE. On the RE occupied by the second reference signal, the base station sends the 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 are pseudo-orthogonal (that is, the generators of pseudo-random sequences have different initial values). In this sub-embodiment, the first UE can use the first reference signal and the second reference signal to perform channel estimation on the wireless channel in the second LTE subframe, so as to reduce the interference of the third reference signal. The capacity of the reference signal is increased without significantly degrading the channel estimation performance.

Example 5

Embodiment 5 illustrates a schematic diagram of density changes of reference signals in different time windows, as shown in FIG. 5 . In FIG. 5 , the squares marked with slashes are REs occupied by the first reference signal, and the squares marked with backslashes are REs occupied by the second reference signal.

In Embodiment 5, the K reference signals in the present invention include the first reference signal and the second reference signal, and the time window in the present invention is an LTE subframe. The first reference signal is transmitted in the first LTE subframe, and 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, and PRB#v2 is one of the PRBs occupied by the second reference signal in the frequency domain. The indices v1 and v2 of the PRB in the frequency domain are integers respectively.

In Embodiment 5, at least two of the K reference signals have different densities within a PRB pair.

As shown in FIG. 5 , the density of the first reference signal in PRB #v1 is greater than the density of the second reference signal in PRB #v2. Although the density of reference signals in PRB#v2 is low, the UE can perform channel estimation on the wireless channel in the second LTE subframe according to the first reference signal and the second reference signal, on the premise of reducing the reference signal overhead (Overhead) The performance of channel estimation is guaranteed.

Example 6

Embodiment 6 is a structural block diagram of a processing device used in a UE, as shown in FIG. 6 . In FIG. 4 , 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 parameters of the current time window.

In Embodiment 6, 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 time domain Dispatch unit. 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 according to a default sorting manner.

As a sub-embodiment 1 of Embodiment 6, the first module is further configured to receive a 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. The first signaling is high-level signaling.

As a sub-embodiment 2 of Embodiment 6, the reference signal includes L RS ports, the K reference signals include at least the first reference signal and the second reference signal, and the index of at least one RS port in the first reference signal is a value other than the indices of the L RS ports of the second reference signal. Said 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 according to a default sorting manner.

As a sub-embodiment 3 of Embodiment 6, the time window is an LTE subframe, and the RE pattern occupied by the RS port in the PRB pair reuses the 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}.

Example 7

Embodiment 7 is a structural block diagram of a processing device used in a base station, as shown in FIG. 7 . In FIG. 7 , the base station device 300 is composed of a first module 301 .

The first module 301 is configured to send the first signaling and send K reference signals in K time windows respectively.

In Embodiment 7, the K reference signals are specific to the UE, the K is a positive integer, the current time window is the latest one (that is, occurs latest) among the K time windows, and the time window is a time domain The basic scheduling unit. 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 according to a default sorting manner. 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.

As sub-embodiment 1 of embodiment 7, the K is 1.

As a sub-embodiment 2 of Embodiment 7, 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.

As a sub-embodiment 3 of Embodiment 7, the time window is an LTE subframe, and the RE pattern occupied by the RS port in the PRB pair reuses the pattern occupied by an LTE URS port in the PRB pair.

Those skilled in the art can understand that all or part of the steps in the above method can be completed by instructing related hardware through a program, and the program can be stored in a computer-readable storage medium, such as a read-only memory, a hard disk or an optical disk. Optionally, all or part of the steps in the foregoing embodiments may also be implemented using one or more integrated circuits. Correspondingly, each module unit in the above-mentioned embodiments may be implemented in the form of hardware, or may be implemented in the form of software function modules, and the present application is not limited to any specific combination of software and hardware. The UE in the present invention includes but not limited to wireless communication devices such as mobile phones, tablet computers, notebooks, and network cards. The base station in the present invention includes but not limited to wireless communication equipment such as a macrocell base station, a microcell base station, a home base station, and a relay base station.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the protection scope of the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims (16)

1. A method in a UE supporting channel estimation across time windows, comprising the steps of: - Step A. 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. Wherein, the K reference signals are specific to the UE, the K is a positive integer, the current time window is the latest one among the K time windows, and the time window is a basic scheduling unit in the time domain. 2. The method according to claim 1, further comprising the steps of: - Step B. Perform channel equalization on the downlink signal received in the current time window according to the channel parameters of the current time window. 3. The method according to claim 1, wherein said step A further comprises the steps of: - Step A0. Receive a 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. 4. The method according to claim 1, wherein the RS sequence of the reference signal is specific to a time window. 5. The method according to claim 3, wherein the UE selects the K time windows from a target time window set, and the target time window set consists of all target time windows in an observation period In the composition, the target time window refers to a time window in which the UE is scheduled to perform downlink reception. 6. The method according to claim 1-5, wherein the reference signal includes L RS ports, and the K reference signals include at least two reference signals, wherein at least one RS in one reference signal The index of the port is a value other than the index of the L RS ports of another reference signal. 7. The method according to claim 1, 6, wherein 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 are sent. 8. A method in a base station supporting massive MIMO, wherein, comprising the steps of: - Step A. Sending K reference signals respectively in K time windows. The K reference signals can be used by the UE to estimate channel parameters of the current time window. Wherein, the K reference signals are specific to the UE, the K is a positive integer, the current time window is the latest one among the K time windows, and the time window is a basic scheduling unit in the time domain. 9. The method according to claim 8, wherein said step A further comprises the steps of: - Step A0. Sending a 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. 10. The method according to claim 8, wherein the RS sequence of the reference signal is specific to a time window. 11. The method according to claim 8-10, wherein the reference signal includes L RS ports, and the K reference signals include at least two reference signals, wherein at least one RS in one reference signal The index of the port is a value other than the index of the L RS ports of another reference signal. 12. The method according to claim 8, 11, wherein 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 are sent. 13. A user equipment supporting channel estimation across time windows, characterized in that the equipment comprises: The first module: for receiving K reference signals in K time windows respectively, and estimating channel parameters of the 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 parameters of the current time window. Wherein, the K reference signals are specific to the UE, the K is a positive integer, the current time window is the latest one among the K time windows, and the time window is a basic scheduling unit in 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 according to a default sorting manner. 14. The device according to claim 13, wherein the first module is further configured to receive a 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. 15. A base station device supporting massive MIMO, characterized in that the device comprises: The first module: used for sending K reference signals respectively in K time windows. Wherein, the K reference signals are specific to the UE, the K is a positive integer, the current time window is the latest one among the K time windows, and the time window is a basic scheduling unit in 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 according to a default sorting manner. 16. The base station device according to claim 15, wherein the first module is further configured to send a 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.